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winbindd: queryuser - only get group name if needed
[Samba.git] / source3 / smbd / posix_acls.c
blobe4403458495493c7e9a419d6bf5053e5abc0df25
1 /*
2 Unix SMB/CIFS implementation.
3 SMB NT Security Descriptor / Unix permission conversion.
4 Copyright (C) Jeremy Allison 1994-2009.
5 Copyright (C) Andreas Gruenbacher 2002.
6 Copyright (C) Simo Sorce <idra@samba.org> 2009.
7
8 This program is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 3 of the License, or
11 (at your option) any later version.
12
13 This program is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
17
18 You should have received a copy of the GNU General Public License
19 along with this program. If not, see <http://www.gnu.org/licenses/>.
20 */
21
22 #include "includes.h"
23 #include "smbd/smbd.h"
24 #include "system/filesys.h"
25 #include "../libcli/security/security.h"
26 #include "trans2.h"
27 #include "passdb/lookup_sid.h"
28 #include "auth.h"
29 #include "../librpc/gen_ndr/idmap.h"
30 #include "../librpc/gen_ndr/ndr_smb_acl.h"
31 #include "lib/param/loadparm.h"
32
33 extern const struct generic_mapping file_generic_mapping;
34
35 #undef DBGC_CLASS
36 #define DBGC_CLASS DBGC_ACLS
37
38 /****************************************************************************
39 Data structures representing the internal ACE format.
40 ****************************************************************************/
41
42 enum ace_owner {UID_ACE, GID_ACE, WORLD_ACE};
43 enum ace_attribute {ALLOW_ACE, DENY_ACE}; /* Used for incoming NT ACLS. */
44
45 typedef struct canon_ace {
46 struct canon_ace *next, *prev;
47 SMB_ACL_TAG_T type;
48 mode_t perms; /* Only use S_I(R|W|X)USR mode bits here. */
49 struct dom_sid trustee;
50 enum ace_owner owner_type;
51 enum ace_attribute attr;
52 struct unixid unix_ug;
53 uint8_t ace_flags; /* From windows ACE entry. */
54 } canon_ace;
55
56 #define ALL_ACE_PERMS (S_IRUSR|S_IWUSR|S_IXUSR)
57
58 /*
59 * EA format of user.SAMBA_PAI (Samba_Posix_Acl_Interitance)
60 * attribute on disk - version 1.
61 * All values are little endian.
62 *
63 * | 1 | 1 | 2 | 2 | ....
64 * +------+------+-------------+---------------------+-------------+--------------------+
65 * | vers | flag | num_entries | num_default_entries | ..entries.. | default_entries... |
66 * +------+------+-------------+---------------------+-------------+--------------------+
67 *
68 * Entry format is :
69 *
70 * | 1 | 4 |
71 * +------+-------------------+
72 * | value| uid/gid or world |
73 * | type | value |
74 * +------+-------------------+
75 *
76 * Version 2 format. Stores extra Windows metadata about an ACL.
77 *
78 * | 1 | 2 | 2 | 2 | ....
79 * +------+----------+-------------+---------------------+-------------+--------------------+
80 * | vers | ace | num_entries | num_default_entries | ..entries.. | default_entries... |
81 * | 2 | type | | | | |
82 * +------+----------+-------------+---------------------+-------------+--------------------+
83 *
84 * Entry format is :
85 *
86 * | 1 | 1 | 4 |
87 * +------+------+-------------------+
88 * | ace | value| uid/gid or world |
89 * | flag | type | value |
90 * +------+-------------------+------+
91 *
92 */
93
94 #define PAI_VERSION_OFFSET 0
95
96 #define PAI_V1_FLAG_OFFSET 1
97 #define PAI_V1_NUM_ENTRIES_OFFSET 2
98 #define PAI_V1_NUM_DEFAULT_ENTRIES_OFFSET 4
99 #define PAI_V1_ENTRIES_BASE 6
100 #define PAI_V1_ACL_FLAG_PROTECTED 0x1
101 #define PAI_V1_ENTRY_LENGTH 5
102
103 #define PAI_V1_VERSION 1
104
105 #define PAI_V2_TYPE_OFFSET 1
106 #define PAI_V2_NUM_ENTRIES_OFFSET 3
107 #define PAI_V2_NUM_DEFAULT_ENTRIES_OFFSET 5
108 #define PAI_V2_ENTRIES_BASE 7
109 #define PAI_V2_ENTRY_LENGTH 6
110
111 #define PAI_V2_VERSION 2
112
113 /*
114 * In memory format of user.SAMBA_PAI attribute.
115 */
116
117 struct pai_entry {
118 struct pai_entry *next, *prev;
119 uint8_t ace_flags;
120 enum ace_owner owner_type;
121 struct unixid unix_ug;
122 };
123
124 struct pai_val {
125 uint16_t sd_type;
126 unsigned int num_entries;
127 struct pai_entry *entry_list;
128 unsigned int num_def_entries;
129 struct pai_entry *def_entry_list;
130 };
131
132 /************************************************************************
133 Return a uint32_t of the pai_entry principal.
134 ************************************************************************/
135
136 static uint32_t get_pai_entry_val(struct pai_entry *paie)
137 {
138 switch (paie->owner_type) {
139 case UID_ACE:
140 DEBUG(10,("get_pai_entry_val: uid = %u\n", (unsigned int)paie->unix_ug.id ));
141 return (uint32_t)paie->unix_ug.id;
142 case GID_ACE:
143 DEBUG(10,("get_pai_entry_val: gid = %u\n", (unsigned int)paie->unix_ug.id ));
144 return (uint32_t)paie->unix_ug.id;
145 case WORLD_ACE:
146 default:
147 DEBUG(10,("get_pai_entry_val: world ace\n"));
148 return (uint32_t)-1;
149 }
150 }
151
152 /************************************************************************
153 Return a uint32_t of the entry principal.
154 ************************************************************************/
155
156 static uint32_t get_entry_val(canon_ace *ace_entry)
157 {
158 switch (ace_entry->owner_type) {
159 case UID_ACE:
160 DEBUG(10,("get_entry_val: uid = %u\n", (unsigned int)ace_entry->unix_ug.id ));
161 return (uint32_t)ace_entry->unix_ug.id;
162 case GID_ACE:
163 DEBUG(10,("get_entry_val: gid = %u\n", (unsigned int)ace_entry->unix_ug.id ));
164 return (uint32_t)ace_entry->unix_ug.id;
165 case WORLD_ACE:
166 default:
167 DEBUG(10,("get_entry_val: world ace\n"));
168 return (uint32_t)-1;
169 }
170 }
171
172 /************************************************************************
173 Create the on-disk format (always v2 now). Caller must free.
174 ************************************************************************/
175
176 static char *create_pai_buf_v2(canon_ace *file_ace_list,
177 canon_ace *dir_ace_list,
178 uint16_t sd_type,
179 size_t *store_size)
180 {
181 char *pai_buf = NULL;
182 canon_ace *ace_list = NULL;
183 char *entry_offset = NULL;
184 unsigned int num_entries = 0;
185 unsigned int num_def_entries = 0;
186 unsigned int i;
187
188 for (ace_list = file_ace_list; ace_list; ace_list = ace_list->next) {
189 num_entries++;
190 }
191
192 for (ace_list = dir_ace_list; ace_list; ace_list = ace_list->next) {
193 num_def_entries++;
194 }
195
196 DEBUG(10,("create_pai_buf_v2: num_entries = %u, num_def_entries = %u\n", num_entries, num_def_entries ));
197
198 *store_size = PAI_V2_ENTRIES_BASE +
199 ((num_entries + num_def_entries)*PAI_V2_ENTRY_LENGTH);
200
201 pai_buf = talloc_array(talloc_tos(), char, *store_size);
202 if (!pai_buf) {
203 return NULL;
204 }
205
206 /* Set up the header. */
207 memset(pai_buf, '\0', PAI_V2_ENTRIES_BASE);
208 SCVAL(pai_buf,PAI_VERSION_OFFSET,PAI_V2_VERSION);
209 SSVAL(pai_buf,PAI_V2_TYPE_OFFSET, sd_type);
210 SSVAL(pai_buf,PAI_V2_NUM_ENTRIES_OFFSET,num_entries);
211 SSVAL(pai_buf,PAI_V2_NUM_DEFAULT_ENTRIES_OFFSET,num_def_entries);
212
213 DEBUG(10,("create_pai_buf_v2: sd_type = 0x%x\n",
214 (unsigned int)sd_type ));
215
216 entry_offset = pai_buf + PAI_V2_ENTRIES_BASE;
217
218 i = 0;
219 for (ace_list = file_ace_list; ace_list; ace_list = ace_list->next) {
220 uint8_t type_val = (uint8_t)ace_list->owner_type;
221 uint32_t entry_val = get_entry_val(ace_list);
222
223 SCVAL(entry_offset,0,ace_list->ace_flags);
224 SCVAL(entry_offset,1,type_val);
225 SIVAL(entry_offset,2,entry_val);
226 DEBUG(10,("create_pai_buf_v2: entry %u [0x%x] [0x%x] [0x%x]\n",
227 i,
228 (unsigned int)ace_list->ace_flags,
229 (unsigned int)type_val,
230 (unsigned int)entry_val ));
231 i++;
232 entry_offset += PAI_V2_ENTRY_LENGTH;
233 }
234
235 for (ace_list = dir_ace_list; ace_list; ace_list = ace_list->next) {
236 uint8_t type_val = (uint8_t)ace_list->owner_type;
237 uint32_t entry_val = get_entry_val(ace_list);
238
239 SCVAL(entry_offset,0,ace_list->ace_flags);
240 SCVAL(entry_offset,1,type_val);
241 SIVAL(entry_offset,2,entry_val);
242 DEBUG(10,("create_pai_buf_v2: entry %u [0x%x] [0x%x] [0x%x]\n",
243 i,
244 (unsigned int)ace_list->ace_flags,
245 (unsigned int)type_val,
246 (unsigned int)entry_val ));
247 i++;
248 entry_offset += PAI_V2_ENTRY_LENGTH;
249 }
250
251 return pai_buf;
252 }
253
254 /************************************************************************
255 Store the user.SAMBA_PAI attribute on disk.
256 ************************************************************************/
257
258 static void store_inheritance_attributes(files_struct *fsp,
259 canon_ace *file_ace_list,
260 canon_ace *dir_ace_list,
261 uint16_t sd_type)
262 {
263 int ret;
264 size_t store_size;
265 char *pai_buf;
266
267 if (!lp_map_acl_inherit(SNUM(fsp->conn))) {
268 return;
269 }
270
271 pai_buf = create_pai_buf_v2(file_ace_list, dir_ace_list,
272 sd_type, &store_size);
273
274 if (fsp->fh->fd != -1) {
275 ret = SMB_VFS_FSETXATTR(fsp, SAMBA_POSIX_INHERITANCE_EA_NAME,
276 pai_buf, store_size, 0);
277 } else {
278 ret = SMB_VFS_SETXATTR(fsp->conn, fsp->fsp_name,
279 SAMBA_POSIX_INHERITANCE_EA_NAME,
280 pai_buf, store_size, 0);
281 }
282
283 TALLOC_FREE(pai_buf);
284
285 DEBUG(10,("store_inheritance_attribute: type 0x%x for file %s\n",
286 (unsigned int)sd_type,
287 fsp_str_dbg(fsp)));
288
289 if (ret == -1 && !no_acl_syscall_error(errno)) {
290 DEBUG(1,("store_inheritance_attribute: Error %s\n", strerror(errno) ));
291 }
292 }
293
294 /************************************************************************
295 Delete the in memory inheritance info.
296 ************************************************************************/
297
298 static void free_inherited_info(struct pai_val *pal)
299 {
300 if (pal) {
301 struct pai_entry *paie, *paie_next;
302 for (paie = pal->entry_list; paie; paie = paie_next) {
303 paie_next = paie->next;
304 TALLOC_FREE(paie);
305 }
306 for (paie = pal->def_entry_list; paie; paie = paie_next) {
307 paie_next = paie->next;
308 TALLOC_FREE(paie);
309 }
310 TALLOC_FREE(pal);
311 }
312 }
313
314 /************************************************************************
315 Get any stored ACE flags.
316 ************************************************************************/
317
318 static uint16_t get_pai_flags(struct pai_val *pal, canon_ace *ace_entry, bool default_ace)
319 {
320 struct pai_entry *paie;
321
322 if (!pal) {
323 return 0;
324 }
325
326 /* If the entry exists it is inherited. */
327 for (paie = (default_ace ? pal->def_entry_list : pal->entry_list); paie; paie = paie->next) {
328 if (ace_entry->owner_type == paie->owner_type &&
329 get_entry_val(ace_entry) == get_pai_entry_val(paie))
330 return paie->ace_flags;
331 }
332 return 0;
333 }
334
335 /************************************************************************
336 Ensure an attribute just read is valid - v1.
337 ************************************************************************/
338
339 static bool check_pai_ok_v1(const char *pai_buf, size_t pai_buf_data_size)
340 {
341 uint16_t num_entries;
342 uint16_t num_def_entries;
343
344 if (pai_buf_data_size < PAI_V1_ENTRIES_BASE) {
345 /* Corrupted - too small. */
346 return false;
347 }
348
349 if (CVAL(pai_buf,PAI_VERSION_OFFSET) != PAI_V1_VERSION) {
350 return false;
351 }
352
353 num_entries = SVAL(pai_buf,PAI_V1_NUM_ENTRIES_OFFSET);
354 num_def_entries = SVAL(pai_buf,PAI_V1_NUM_DEFAULT_ENTRIES_OFFSET);
355
356 /* Check the entry lists match. */
357 /* Each entry is 5 bytes (type plus 4 bytes of uid or gid). */
358
359 if (((num_entries + num_def_entries)*PAI_V1_ENTRY_LENGTH) +
360 PAI_V1_ENTRIES_BASE != pai_buf_data_size) {
361 return false;
362 }
363
364 return true;
365 }
366
367 /************************************************************************
368 Ensure an attribute just read is valid - v2.
369 ************************************************************************/
370
371 static bool check_pai_ok_v2(const char *pai_buf, size_t pai_buf_data_size)
372 {
373 uint16_t num_entries;
374 uint16_t num_def_entries;
375
376 if (pai_buf_data_size < PAI_V2_ENTRIES_BASE) {
377 /* Corrupted - too small. */
378 return false;
379 }
380
381 if (CVAL(pai_buf,PAI_VERSION_OFFSET) != PAI_V2_VERSION) {
382 return false;
383 }
384
385 num_entries = SVAL(pai_buf,PAI_V2_NUM_ENTRIES_OFFSET);
386 num_def_entries = SVAL(pai_buf,PAI_V2_NUM_DEFAULT_ENTRIES_OFFSET);
387
388 /* Check the entry lists match. */
389 /* Each entry is 6 bytes (flags + type + 4 bytes of uid or gid). */
390
391 if (((num_entries + num_def_entries)*PAI_V2_ENTRY_LENGTH) +
392 PAI_V2_ENTRIES_BASE != pai_buf_data_size) {
393 return false;
394 }
395
396 return true;
397 }
398
399 /************************************************************************
400 Decode the owner.
401 ************************************************************************/
402
403 static bool get_pai_owner_type(struct pai_entry *paie, const char *entry_offset)
404 {
405 paie->owner_type = (enum ace_owner)CVAL(entry_offset,0);
406 switch( paie->owner_type) {
407 case UID_ACE:
408 paie->unix_ug.type = ID_TYPE_UID;
409 paie->unix_ug.id = (uid_t)IVAL(entry_offset,1);
410 DEBUG(10,("get_pai_owner_type: uid = %u\n",
411 (unsigned int)paie->unix_ug.id ));
412 break;
413 case GID_ACE:
414 paie->unix_ug.type = ID_TYPE_GID;
415 paie->unix_ug.id = (gid_t)IVAL(entry_offset,1);
416 DEBUG(10,("get_pai_owner_type: gid = %u\n",
417 (unsigned int)paie->unix_ug.id ));
418 break;
419 case WORLD_ACE:
420 paie->unix_ug.type = ID_TYPE_NOT_SPECIFIED;
421 paie->unix_ug.id = -1;
422 DEBUG(10,("get_pai_owner_type: world ace\n"));
423 break;
424 default:
425 DEBUG(10,("get_pai_owner_type: unknown type %u\n",
426 (unsigned int)paie->owner_type ));
427 return false;
428 }
429 return true;
430 }
431
432 /************************************************************************
433 Process v2 entries.
434 ************************************************************************/
435
436 static const char *create_pai_v1_entries(struct pai_val *paiv,
437 const char *entry_offset,
438 bool def_entry)
439 {
440 unsigned int i;
441
442 for (i = 0; i < paiv->num_entries; i++) {
443 struct pai_entry *paie = talloc(talloc_tos(), struct pai_entry);
444 if (!paie) {
445 return NULL;
446 }
447
448 paie->ace_flags = SEC_ACE_FLAG_INHERITED_ACE;
449 if (!get_pai_owner_type(paie, entry_offset)) {
450 TALLOC_FREE(paie);
451 return NULL;
452 }
453
454 if (!def_entry) {
455 DLIST_ADD(paiv->entry_list, paie);
456 } else {
457 DLIST_ADD(paiv->def_entry_list, paie);
458 }
459 entry_offset += PAI_V1_ENTRY_LENGTH;
460 }
461 return entry_offset;
462 }
463
464 /************************************************************************
465 Convert to in-memory format from version 1.
466 ************************************************************************/
467
468 static struct pai_val *create_pai_val_v1(const char *buf, size_t size)
469 {
470 const char *entry_offset;
471 struct pai_val *paiv = NULL;
472
473 if (!check_pai_ok_v1(buf, size)) {
474 return NULL;
475 }
476
477 paiv = talloc(talloc_tos(), struct pai_val);
478 if (!paiv) {
479 return NULL;
480 }
481
482 memset(paiv, '\0', sizeof(struct pai_val));
483
484 paiv->sd_type = (CVAL(buf,PAI_V1_FLAG_OFFSET) == PAI_V1_ACL_FLAG_PROTECTED) ?
485 SEC_DESC_DACL_PROTECTED : 0;
486
487 paiv->num_entries = SVAL(buf,PAI_V1_NUM_ENTRIES_OFFSET);
488 paiv->num_def_entries = SVAL(buf,PAI_V1_NUM_DEFAULT_ENTRIES_OFFSET);
489
490 entry_offset = buf + PAI_V1_ENTRIES_BASE;
491
492 DEBUG(10,("create_pai_val: num_entries = %u, num_def_entries = %u\n",
493 paiv->num_entries, paiv->num_def_entries ));
494
495 entry_offset = create_pai_v1_entries(paiv, entry_offset, false);
496 if (entry_offset == NULL) {
497 free_inherited_info(paiv);
498 return NULL;
499 }
500 entry_offset = create_pai_v1_entries(paiv, entry_offset, true);
501 if (entry_offset == NULL) {
502 free_inherited_info(paiv);
503 return NULL;
504 }
505
506 return paiv;
507 }
508
509 /************************************************************************
510 Process v2 entries.
511 ************************************************************************/
512
513 static const char *create_pai_v2_entries(struct pai_val *paiv,
514 unsigned int num_entries,
515 const char *entry_offset,
516 bool def_entry)
517 {
518 unsigned int i;
519
520 for (i = 0; i < num_entries; i++) {
521 struct pai_entry *paie = talloc(talloc_tos(), struct pai_entry);
522 if (!paie) {
523 return NULL;
524 }
525
526 paie->ace_flags = CVAL(entry_offset,0);
527
528 if (!get_pai_owner_type(paie, entry_offset+1)) {
529 TALLOC_FREE(paie);
530 return NULL;
531 }
532 if (!def_entry) {
533 DLIST_ADD(paiv->entry_list, paie);
534 } else {
535 DLIST_ADD(paiv->def_entry_list, paie);
536 }
537 entry_offset += PAI_V2_ENTRY_LENGTH;
538 }
539 return entry_offset;
540 }
541
542 /************************************************************************
543 Convert to in-memory format from version 2.
544 ************************************************************************/
545
546 static struct pai_val *create_pai_val_v2(const char *buf, size_t size)
547 {
548 const char *entry_offset;
549 struct pai_val *paiv = NULL;
550
551 if (!check_pai_ok_v2(buf, size)) {
552 return NULL;
553 }
554
555 paiv = talloc(talloc_tos(), struct pai_val);
556 if (!paiv) {
557 return NULL;
558 }
559
560 memset(paiv, '\0', sizeof(struct pai_val));
561
562 paiv->sd_type = SVAL(buf,PAI_V2_TYPE_OFFSET);
563
564 paiv->num_entries = SVAL(buf,PAI_V2_NUM_ENTRIES_OFFSET);
565 paiv->num_def_entries = SVAL(buf,PAI_V2_NUM_DEFAULT_ENTRIES_OFFSET);
566
567 entry_offset = buf + PAI_V2_ENTRIES_BASE;
568
569 DEBUG(10,("create_pai_val_v2: sd_type = 0x%x num_entries = %u, num_def_entries = %u\n",
570 (unsigned int)paiv->sd_type,
571 paiv->num_entries, paiv->num_def_entries ));
572
573 entry_offset = create_pai_v2_entries(paiv, paiv->num_entries,
574 entry_offset, false);
575 if (entry_offset == NULL) {
576 free_inherited_info(paiv);
577 return NULL;
578 }
579 entry_offset = create_pai_v2_entries(paiv, paiv->num_def_entries,
580 entry_offset, true);
581 if (entry_offset == NULL) {
582 free_inherited_info(paiv);
583 return NULL;
584 }
585
586 return paiv;
587 }
588
589 /************************************************************************
590 Convert to in-memory format - from either version 1 or 2.
591 ************************************************************************/
592
593 static struct pai_val *create_pai_val(const char *buf, size_t size)
594 {
595 if (size < 1) {
596 return NULL;
597 }
598 if (CVAL(buf,PAI_VERSION_OFFSET) == PAI_V1_VERSION) {
599 return create_pai_val_v1(buf, size);
600 } else if (CVAL(buf,PAI_VERSION_OFFSET) == PAI_V2_VERSION) {
601 return create_pai_val_v2(buf, size);
602 } else {
603 return NULL;
604 }
605 }
606
607 /************************************************************************
608 Load the user.SAMBA_PAI attribute.
609 ************************************************************************/
610
611 static struct pai_val *fload_inherited_info(files_struct *fsp)
612 {
613 char *pai_buf;
614 size_t pai_buf_size = 1024;
615 struct pai_val *paiv = NULL;
616 ssize_t ret;
617
618 if (!lp_map_acl_inherit(SNUM(fsp->conn))) {
619 return NULL;
620 }
621
622 if ((pai_buf = talloc_array(talloc_tos(), char, pai_buf_size)) == NULL) {
623 return NULL;
624 }
625
626 do {
627 if (fsp->fh->fd != -1) {
628 ret = SMB_VFS_FGETXATTR(fsp, SAMBA_POSIX_INHERITANCE_EA_NAME,
629 pai_buf, pai_buf_size);
630 } else {
631 ret = SMB_VFS_GETXATTR(fsp->conn,
632 fsp->fsp_name,
633 SAMBA_POSIX_INHERITANCE_EA_NAME,
634 pai_buf, pai_buf_size);
635 }
636
637 if (ret == -1) {
638 if (errno != ERANGE) {
639 break;
640 }
641 /* Buffer too small - enlarge it. */
642 pai_buf_size *= 2;
643 TALLOC_FREE(pai_buf);
644 if (pai_buf_size > 1024*1024) {
645 return NULL; /* Limit malloc to 1mb. */
646 }
647 if ((pai_buf = talloc_array(talloc_tos(), char, pai_buf_size)) == NULL)
648 return NULL;
649 }
650 } while (ret == -1);
651
652 DEBUG(10,("load_inherited_info: ret = %lu for file %s\n",
653 (unsigned long)ret, fsp_str_dbg(fsp)));
654
655 if (ret == -1) {
656 /* No attribute or not supported. */
657 #if defined(ENOATTR)
658 if (errno != ENOATTR)
659 DEBUG(10,("load_inherited_info: Error %s\n", strerror(errno) ));
660 #else
661 if (errno != ENOSYS)
662 DEBUG(10,("load_inherited_info: Error %s\n", strerror(errno) ));
663 #endif
664 TALLOC_FREE(pai_buf);
665 return NULL;
666 }
667
668 paiv = create_pai_val(pai_buf, ret);
669
670 if (paiv) {
671 DEBUG(10,("load_inherited_info: ACL type is 0x%x for file %s\n",
672 (unsigned int)paiv->sd_type, fsp_str_dbg(fsp)));
673 }
674
675 TALLOC_FREE(pai_buf);
676 return paiv;
677 }
678
679 /************************************************************************
680 Load the user.SAMBA_PAI attribute.
681 ************************************************************************/
682
683 static struct pai_val *load_inherited_info(const struct connection_struct *conn,
684 const struct smb_filename *smb_fname)
685 {
686 char *pai_buf;
687 size_t pai_buf_size = 1024;
688 struct pai_val *paiv = NULL;
689 ssize_t ret;
690
691 if (!lp_map_acl_inherit(SNUM(conn))) {
692 return NULL;
693 }
694
695 if ((pai_buf = talloc_array(talloc_tos(), char, pai_buf_size)) == NULL) {
696 return NULL;
697 }
698
699 do {
700 ret = SMB_VFS_GETXATTR(conn, smb_fname,
701 SAMBA_POSIX_INHERITANCE_EA_NAME,
702 pai_buf, pai_buf_size);
703
704 if (ret == -1) {
705 if (errno != ERANGE) {
706 break;
707 }
708 /* Buffer too small - enlarge it. */
709 pai_buf_size *= 2;
710 TALLOC_FREE(pai_buf);
711 if (pai_buf_size > 1024*1024) {
712 return NULL; /* Limit malloc to 1mb. */
713 }
714 if ((pai_buf = talloc_array(talloc_tos(), char, pai_buf_size)) == NULL)
715 return NULL;
716 }
717 } while (ret == -1);
718
719 DEBUG(10,("load_inherited_info: ret = %lu for file %s\n",
720 (unsigned long)ret, smb_fname->base_name));
721
722 if (ret == -1) {
723 /* No attribute or not supported. */
724 #if defined(ENOATTR)
725 if (errno != ENOATTR)
726 DEBUG(10,("load_inherited_info: Error %s\n", strerror(errno) ));
727 #else
728 if (errno != ENOSYS)
729 DEBUG(10,("load_inherited_info: Error %s\n", strerror(errno) ));
730 #endif
731 TALLOC_FREE(pai_buf);
732 return NULL;
733 }
734
735 paiv = create_pai_val(pai_buf, ret);
736
737 if (paiv) {
738 DEBUG(10,("load_inherited_info: ACL type 0x%x for file %s\n",
739 (unsigned int)paiv->sd_type,
740 smb_fname->base_name));
741 }
742
743 TALLOC_FREE(pai_buf);
744 return paiv;
745 }
746
747 /****************************************************************************
748 Functions to manipulate the internal ACE format.
749 ****************************************************************************/
750
751 /****************************************************************************
752 Count a linked list of canonical ACE entries.
753 ****************************************************************************/
754
755 static size_t count_canon_ace_list( canon_ace *l_head )
756 {
757 size_t count = 0;
758 canon_ace *ace;
759
760 for (ace = l_head; ace; ace = ace->next)
761 count++;
762
763 return count;
764 }
765
766 /****************************************************************************
767 Free a linked list of canonical ACE entries.
768 ****************************************************************************/
769
770 static void free_canon_ace_list( canon_ace *l_head )
771 {
772 canon_ace *list, *next;
773
774 for (list = l_head; list; list = next) {
775 next = list->next;
776 DLIST_REMOVE(l_head, list);
777 TALLOC_FREE(list);
778 }
779 }
780
781 /****************************************************************************
782 Function to duplicate a canon_ace entry.
783 ****************************************************************************/
784
785 static canon_ace *dup_canon_ace( canon_ace *src_ace)
786 {
787 canon_ace *dst_ace = talloc(talloc_tos(), canon_ace);
788
789 if (dst_ace == NULL)
790 return NULL;
791
792 *dst_ace = *src_ace;
793 dst_ace->prev = dst_ace->next = NULL;
794 return dst_ace;
795 }
796
797 /****************************************************************************
798 Print out a canon ace.
799 ****************************************************************************/
800
801 static void print_canon_ace(canon_ace *pace, int num)
802 {
803 dbgtext( "canon_ace index %d. Type = %s ", num, pace->attr == ALLOW_ACE ? "allow" : "deny" );
804 dbgtext( "SID = %s ", sid_string_dbg(&pace->trustee));
805 if (pace->owner_type == UID_ACE) {
806 dbgtext( "uid %u ", (unsigned int)pace->unix_ug.id);
807 } else if (pace->owner_type == GID_ACE) {
808 dbgtext( "gid %u ", (unsigned int)pace->unix_ug.id);
809 } else
810 dbgtext( "other ");
811 switch (pace->type) {
812 case SMB_ACL_USER:
813 dbgtext( "SMB_ACL_USER ");
814 break;
815 case SMB_ACL_USER_OBJ:
816 dbgtext( "SMB_ACL_USER_OBJ ");
817 break;
818 case SMB_ACL_GROUP:
819 dbgtext( "SMB_ACL_GROUP ");
820 break;
821 case SMB_ACL_GROUP_OBJ:
822 dbgtext( "SMB_ACL_GROUP_OBJ ");
823 break;
824 case SMB_ACL_OTHER:
825 dbgtext( "SMB_ACL_OTHER ");
826 break;
827 default:
828 dbgtext( "MASK " );
829 break;
830 }
831
832 dbgtext( "ace_flags = 0x%x ", (unsigned int)pace->ace_flags);
833 dbgtext( "perms ");
834 dbgtext( "%c", pace->perms & S_IRUSR ? 'r' : '-');
835 dbgtext( "%c", pace->perms & S_IWUSR ? 'w' : '-');
836 dbgtext( "%c\n", pace->perms & S_IXUSR ? 'x' : '-');
837 }
838
839 /****************************************************************************
840 Print out a canon ace list.
841 ****************************************************************************/
842
843 static void print_canon_ace_list(const char *name, canon_ace *ace_list)
844 {
845 int count = 0;
846
847 if( DEBUGLVL( 10 )) {
848 dbgtext( "print_canon_ace_list: %s\n", name );
849 for (;ace_list; ace_list = ace_list->next, count++)
850 print_canon_ace(ace_list, count );
851 }
852 }
853
854 /****************************************************************************
855 Map POSIX ACL perms to canon_ace permissions (a mode_t containing only S_(R|W|X)USR bits).
856 ****************************************************************************/
857
858 static mode_t convert_permset_to_mode_t(SMB_ACL_PERMSET_T permset)
859 {
860 mode_t ret = 0;
861
862 ret |= (sys_acl_get_perm(permset, SMB_ACL_READ) ? S_IRUSR : 0);
863 ret |= (sys_acl_get_perm(permset, SMB_ACL_WRITE) ? S_IWUSR : 0);
864 ret |= (sys_acl_get_perm(permset, SMB_ACL_EXECUTE) ? S_IXUSR : 0);
865
866 return ret;
867 }
868
869 /****************************************************************************
870 Map generic UNIX permissions to canon_ace permissions (a mode_t containing only S_(R|W|X)USR bits).
871 ****************************************************************************/
872
873 static mode_t unix_perms_to_acl_perms(mode_t mode, int r_mask, int w_mask, int x_mask)
874 {
875 mode_t ret = 0;
876
877 if (mode & r_mask)
878 ret |= S_IRUSR;
879 if (mode & w_mask)
880 ret |= S_IWUSR;
881 if (mode & x_mask)
882 ret |= S_IXUSR;
883
884 return ret;
885 }
886
887 /****************************************************************************
888 Map canon_ace permissions (a mode_t containing only S_(R|W|X)USR bits) to
889 an SMB_ACL_PERMSET_T.
890 ****************************************************************************/
891
892 static int map_acl_perms_to_permset(connection_struct *conn, mode_t mode, SMB_ACL_PERMSET_T *p_permset)
893 {
894 if (sys_acl_clear_perms(*p_permset) == -1)
895 return -1;
896 if (mode & S_IRUSR) {
897 if (sys_acl_add_perm(*p_permset, SMB_ACL_READ) == -1)
898 return -1;
899 }
900 if (mode & S_IWUSR) {
901 if (sys_acl_add_perm(*p_permset, SMB_ACL_WRITE) == -1)
902 return -1;
903 }
904 if (mode & S_IXUSR) {
905 if (sys_acl_add_perm(*p_permset, SMB_ACL_EXECUTE) == -1)
906 return -1;
907 }
908 return 0;
909 }
910
911 /****************************************************************************
912 Function to create owner and group SIDs from a SMB_STRUCT_STAT.
913 ****************************************************************************/
914
915 static void create_file_sids(const SMB_STRUCT_STAT *psbuf,
916 struct dom_sid *powner_sid,
917 struct dom_sid *pgroup_sid)
918 {
919 uid_to_sid( powner_sid, psbuf->st_ex_uid );
920 gid_to_sid( pgroup_sid, psbuf->st_ex_gid );
921 }
922
923 /****************************************************************************
924 Merge aces with a common UID or GID - if both are allow or deny, OR the permissions together and
925 delete the second one. If the first is deny, mask the permissions off and delete the allow
926 if the permissions become zero, delete the deny if the permissions are non zero.
927 ****************************************************************************/
928
929 static void merge_aces( canon_ace **pp_list_head, bool dir_acl)
930 {
931 canon_ace *l_head = *pp_list_head;
932 canon_ace *curr_ace_outer;
933 canon_ace *curr_ace_outer_next;
934
935 /*
936 * First, merge allow entries with identical SIDs, and deny entries
937 * with identical SIDs.
938 */
939
940 for (curr_ace_outer = l_head; curr_ace_outer; curr_ace_outer = curr_ace_outer_next) {
941 canon_ace *curr_ace;
942 canon_ace *curr_ace_next;
943
944 curr_ace_outer_next = curr_ace_outer->next; /* Save the link in case we delete. */
945
946 for (curr_ace = curr_ace_outer->next; curr_ace; curr_ace = curr_ace_next) {
947 bool can_merge = false;
948
949 curr_ace_next = curr_ace->next; /* Save the link in case of delete. */
950
951 /* For file ACLs we can merge if the SIDs and ALLOW/DENY
952 * types are the same. For directory acls we must also
953 * ensure the POSIX ACL types are the same.
954 *
955 * For the IDMAP_BOTH case, we must not merge
956 * the UID and GID ACE values for same SID
957 */
958
959 if (!dir_acl) {
960 can_merge = (curr_ace->unix_ug.id == curr_ace_outer->unix_ug.id &&
961 curr_ace->owner_type == curr_ace_outer->owner_type &&
962 (curr_ace->attr == curr_ace_outer->attr));
963 } else {
964 can_merge = (curr_ace->unix_ug.id == curr_ace_outer->unix_ug.id &&
965 curr_ace->owner_type == curr_ace_outer->owner_type &&
966 (curr_ace->type == curr_ace_outer->type) &&
967 (curr_ace->attr == curr_ace_outer->attr));
968 }
969
970 if (can_merge) {
971 if( DEBUGLVL( 10 )) {
972 dbgtext("merge_aces: Merging ACE's\n");
973 print_canon_ace( curr_ace_outer, 0);
974 print_canon_ace( curr_ace, 0);
975 }
976
977 /* Merge two allow or two deny ACE's. */
978
979 /* Theoretically we shouldn't merge a dir ACE if
980 * one ACE has the CI flag set, and the other
981 * ACE has the OI flag set, but this is rare
982 * enough we can ignore it. */
983
984 curr_ace_outer->perms |= curr_ace->perms;
985 curr_ace_outer->ace_flags |= curr_ace->ace_flags;
986 DLIST_REMOVE(l_head, curr_ace);
987 TALLOC_FREE(curr_ace);
988 curr_ace_outer_next = curr_ace_outer->next; /* We may have deleted the link. */
989 }
990 }
991 }
992
993 /*
994 * Now go through and mask off allow permissions with deny permissions.
995 * We can delete either the allow or deny here as we know that each SID
996 * appears only once in the list.
997 */
998
999 for (curr_ace_outer = l_head; curr_ace_outer; curr_ace_outer = curr_ace_outer_next) {
1000 canon_ace *curr_ace;
1001 canon_ace *curr_ace_next;
1002
1003 curr_ace_outer_next = curr_ace_outer->next; /* Save the link in case we delete. */
1004
1005 for (curr_ace = curr_ace_outer->next; curr_ace; curr_ace = curr_ace_next) {
1006
1007 curr_ace_next = curr_ace->next; /* Save the link in case of delete. */
1008
1009 /*
1010 * Subtract ACE's with different entries. Due to the ordering constraints
1011 * we've put on the ACL, we know the deny must be the first one.
1012 */
1013
1014 if (curr_ace->unix_ug.id == curr_ace_outer->unix_ug.id &&
1015 (curr_ace->owner_type == curr_ace_outer->owner_type) &&
1016 (curr_ace_outer->attr == DENY_ACE) && (curr_ace->attr == ALLOW_ACE)) {
1017
1018 if( DEBUGLVL( 10 )) {
1019 dbgtext("merge_aces: Masking ACE's\n");
1020 print_canon_ace( curr_ace_outer, 0);
1021 print_canon_ace( curr_ace, 0);
1022 }
1023
1024 curr_ace->perms &= ~curr_ace_outer->perms;
1025
1026 if (curr_ace->perms == 0) {
1027
1028 /*
1029 * The deny overrides the allow. Remove the allow.
1030 */
1031
1032 DLIST_REMOVE(l_head, curr_ace);
1033 TALLOC_FREE(curr_ace);
1034 curr_ace_outer_next = curr_ace_outer->next; /* We may have deleted the link. */
1035
1036 } else {
1037
1038 /*
1039 * Even after removing permissions, there
1040 * are still allow permissions - delete the deny.
1041 * It is safe to delete the deny here,
1042 * as we are guarenteed by the deny first
1043 * ordering that all the deny entries for
1044 * this SID have already been merged into one
1045 * before we can get to an allow ace.
1046 */
1047
1048 DLIST_REMOVE(l_head, curr_ace_outer);
1049 TALLOC_FREE(curr_ace_outer);
1050 break;
1051 }
1052 }
1053
1054 } /* end for curr_ace */
1055 } /* end for curr_ace_outer */
1056
1057 /* We may have modified the list. */
1058
1059 *pp_list_head = l_head;
1060 }
1061
1062 /****************************************************************************
1063 Map canon_ace perms to permission bits NT.
1064 The attr element is not used here - we only process deny entries on set,
1065 not get. Deny entries are implicit on get with ace->perms = 0.
1066 ****************************************************************************/
1067
1068 uint32_t map_canon_ace_perms(int snum,
1069 enum security_ace_type *pacl_type,
1070 mode_t perms,
1071 bool directory_ace)
1072 {
1073 uint32_t nt_mask = 0;
1074
1075 *pacl_type = SEC_ACE_TYPE_ACCESS_ALLOWED;
1076
1077 if (lp_acl_map_full_control(snum) && ((perms & ALL_ACE_PERMS) == ALL_ACE_PERMS)) {
1078 if (directory_ace) {
1079 nt_mask = UNIX_DIRECTORY_ACCESS_RWX;
1080 } else {
1081 nt_mask = (UNIX_ACCESS_RWX & ~DELETE_ACCESS);
1082 }
1083 } else if ((perms & ALL_ACE_PERMS) == (mode_t)0) {
1084 /*
1085 * Windows NT refuses to display ACEs with no permissions in them (but
1086 * they are perfectly legal with Windows 2000). If the ACE has empty
1087 * permissions we cannot use 0, so we use the otherwise unused
1088 * WRITE_OWNER permission, which we ignore when we set an ACL.
1089 * We abstract this into a #define of UNIX_ACCESS_NONE to allow this
1090 * to be changed in the future.
1091 */
1092
1093 nt_mask = 0;
1094 } else {
1095 if (directory_ace) {
1096 nt_mask |= ((perms & S_IRUSR) ? UNIX_DIRECTORY_ACCESS_R : 0 );
1097 nt_mask |= ((perms & S_IWUSR) ? UNIX_DIRECTORY_ACCESS_W : 0 );
1098 nt_mask |= ((perms & S_IXUSR) ? UNIX_DIRECTORY_ACCESS_X : 0 );
1099 } else {
1100 nt_mask |= ((perms & S_IRUSR) ? UNIX_ACCESS_R : 0 );
1101 nt_mask |= ((perms & S_IWUSR) ? UNIX_ACCESS_W : 0 );
1102 nt_mask |= ((perms & S_IXUSR) ? UNIX_ACCESS_X : 0 );
1103 }
1104 }
1105
1106 if ((perms & S_IWUSR) && lp_dos_filemode(snum)) {
1107 nt_mask |= (SEC_STD_WRITE_DAC|SEC_STD_WRITE_OWNER|DELETE_ACCESS);
1108 }
1109
1110 DEBUG(10,("map_canon_ace_perms: Mapped (UNIX) %x to (NT) %x\n",
1111 (unsigned int)perms, (unsigned int)nt_mask ));
1112
1113 return nt_mask;
1114 }
1115
1116 /****************************************************************************
1117 Map NT perms to a UNIX mode_t.
1118 ****************************************************************************/
1119
1120 #define FILE_SPECIFIC_READ_BITS (FILE_READ_DATA|FILE_READ_EA)
1121 #define FILE_SPECIFIC_WRITE_BITS (FILE_WRITE_DATA|FILE_APPEND_DATA|FILE_WRITE_EA)
1122 #define FILE_SPECIFIC_EXECUTE_BITS (FILE_EXECUTE)
1123
1124 static mode_t map_nt_perms( uint32_t *mask, int type)
1125 {
1126 mode_t mode = 0;
1127
1128 switch(type) {
1129 case S_IRUSR:
1130 if((*mask) & GENERIC_ALL_ACCESS)
1131 mode = S_IRUSR|S_IWUSR|S_IXUSR;
1132 else {
1133 mode |= ((*mask) & (GENERIC_READ_ACCESS|FILE_SPECIFIC_READ_BITS)) ? S_IRUSR : 0;
1134 mode |= ((*mask) & (GENERIC_WRITE_ACCESS|FILE_SPECIFIC_WRITE_BITS)) ? S_IWUSR : 0;
1135 mode |= ((*mask) & (GENERIC_EXECUTE_ACCESS|FILE_SPECIFIC_EXECUTE_BITS)) ? S_IXUSR : 0;
1136 }
1137 break;
1138 case S_IRGRP:
1139 if((*mask) & GENERIC_ALL_ACCESS)
1140 mode = S_IRGRP|S_IWGRP|S_IXGRP;
1141 else {
1142 mode |= ((*mask) & (GENERIC_READ_ACCESS|FILE_SPECIFIC_READ_BITS)) ? S_IRGRP : 0;
1143 mode |= ((*mask) & (GENERIC_WRITE_ACCESS|FILE_SPECIFIC_WRITE_BITS)) ? S_IWGRP : 0;
1144 mode |= ((*mask) & (GENERIC_EXECUTE_ACCESS|FILE_SPECIFIC_EXECUTE_BITS)) ? S_IXGRP : 0;
1145 }
1146 break;
1147 case S_IROTH:
1148 if((*mask) & GENERIC_ALL_ACCESS)
1149 mode = S_IROTH|S_IWOTH|S_IXOTH;
1150 else {
1151 mode |= ((*mask) & (GENERIC_READ_ACCESS|FILE_SPECIFIC_READ_BITS)) ? S_IROTH : 0;
1152 mode |= ((*mask) & (GENERIC_WRITE_ACCESS|FILE_SPECIFIC_WRITE_BITS)) ? S_IWOTH : 0;
1153 mode |= ((*mask) & (GENERIC_EXECUTE_ACCESS|FILE_SPECIFIC_EXECUTE_BITS)) ? S_IXOTH : 0;
1154 }
1155 break;
1156 }
1157
1158 return mode;
1159 }
1160
1161 /****************************************************************************
1162 Unpack a struct security_descriptor into a UNIX owner and group.
1163 ****************************************************************************/
1164
1165 NTSTATUS unpack_nt_owners(struct connection_struct *conn,
1166 uid_t *puser, gid_t *pgrp,
1167 uint32_t security_info_sent, const struct
1168 security_descriptor *psd)
1169 {
1170 *puser = (uid_t)-1;
1171 *pgrp = (gid_t)-1;
1172
1173 if(security_info_sent == 0) {
1174 DEBUG(0,("unpack_nt_owners: no security info sent !\n"));
1175 return NT_STATUS_OK;
1176 }
1177
1178 /*
1179 * Validate the owner and group SID's.
1180 */
1181
1182 DEBUG(5,("unpack_nt_owners: validating owner_sids.\n"));
1183
1184 /*
1185 * Don't immediately fail if the owner sid cannot be validated.
1186 * This may be a group chown only set.
1187 */
1188
1189 if (security_info_sent & SECINFO_OWNER) {
1190 if (!sid_to_uid(psd->owner_sid, puser)) {
1191 if (lp_force_unknown_acl_user(SNUM(conn))) {
1192 /* this allows take ownership to work
1193 * reasonably */
1194 *puser = get_current_uid(conn);
1195 } else {
1196 DEBUG(3,("unpack_nt_owners: unable to validate"
1197 " owner sid for %s\n",
1198 sid_string_dbg(psd->owner_sid)));
1199 return NT_STATUS_INVALID_OWNER;
1200 }
1201 }
1202 DEBUG(3,("unpack_nt_owners: owner sid mapped to uid %u\n",
1203 (unsigned int)*puser ));
1204 }
1205
1206 /*
1207 * Don't immediately fail if the group sid cannot be validated.
1208 * This may be an owner chown only set.
1209 */
1210
1211 if (security_info_sent & SECINFO_GROUP) {
1212 if (!sid_to_gid(psd->group_sid, pgrp)) {
1213 if (lp_force_unknown_acl_user(SNUM(conn))) {
1214 /* this allows take group ownership to work
1215 * reasonably */
1216 *pgrp = get_current_gid(conn);
1217 } else {
1218 DEBUG(3,("unpack_nt_owners: unable to validate"
1219 " group sid.\n"));
1220 return NT_STATUS_INVALID_OWNER;
1221 }
1222 }
1223 DEBUG(3,("unpack_nt_owners: group sid mapped to gid %u\n",
1224 (unsigned int)*pgrp));
1225 }
1226
1227 DEBUG(5,("unpack_nt_owners: owner_sids validated.\n"));
1228
1229 return NT_STATUS_OK;
1230 }
1231
1232
1233 static void trim_ace_perms(canon_ace *pace)
1234 {
1235 pace->perms = pace->perms & (S_IXUSR|S_IWUSR|S_IRUSR);
1236 }
1237
1238 static void ensure_minimal_owner_ace_perms(const bool is_directory,
1239 canon_ace *pace)
1240 {
1241 pace->perms |= S_IRUSR;
1242 if (is_directory) {
1243 pace->perms |= (S_IWUSR|S_IXUSR);
1244 }
1245 }
1246
1247 /****************************************************************************
1248 Check if a given uid/SID is in a group gid/SID. This is probably very
1249 expensive and will need optimisation. A *lot* of optimisation :-). JRA.
1250 ****************************************************************************/
1251
1252 static bool uid_entry_in_group(connection_struct *conn, canon_ace *uid_ace, canon_ace *group_ace )
1253 {
1254 /* "Everyone" always matches every uid. */
1255
1256 if (dom_sid_equal(&group_ace->trustee, &global_sid_World))
1257 return True;
1258
1259 /*
1260 * if it's the current user, we already have the unix token
1261 * and don't need to do the complex user_in_group_sid() call
1262 */
1263 if (uid_ace->unix_ug.id == get_current_uid(conn)) {
1264 const struct security_unix_token *curr_utok = NULL;
1265 size_t i;
1266
1267 if (group_ace->unix_ug.id == get_current_gid(conn)) {
1268 return True;
1269 }
1270
1271 curr_utok = get_current_utok(conn);
1272 for (i=0; i < curr_utok->ngroups; i++) {
1273 if (group_ace->unix_ug.id == curr_utok->groups[i]) {
1274 return True;
1275 }
1276 }
1277 }
1278
1279 /*
1280 * user_in_group_sid() uses create_token_from_sid()
1281 * which creates an artificial NT token given just a username,
1282 * so this is not reliable for users from foreign domains
1283 * exported by winbindd!
1284 */
1285 return user_sid_in_group_sid(&uid_ace->trustee, &group_ace->trustee);
1286 }
1287
1288 /****************************************************************************
1289 A well formed POSIX file or default ACL has at least 3 entries, a
1290 SMB_ACL_USER_OBJ, SMB_ACL_GROUP_OBJ, SMB_ACL_OTHER_OBJ.
1291 In addition, the owner must always have at least read access.
1292 When using this call on get_acl, the pst struct is valid and contains
1293 the mode of the file.
1294 ****************************************************************************/
1295
1296 static bool ensure_canon_entry_valid_on_get(connection_struct *conn,
1297 canon_ace **pp_ace,
1298 const struct dom_sid *pfile_owner_sid,
1299 const struct dom_sid *pfile_grp_sid,
1300 const SMB_STRUCT_STAT *pst)
1301 {
1302 canon_ace *pace;
1303 bool got_user = false;
1304 bool got_group = false;
1305 bool got_other = false;
1306
1307 for (pace = *pp_ace; pace; pace = pace->next) {
1308 if (pace->type == SMB_ACL_USER_OBJ) {
1309 got_user = true;
1310 } else if (pace->type == SMB_ACL_GROUP_OBJ) {
1311 got_group = true;
1312 } else if (pace->type == SMB_ACL_OTHER) {
1313 got_other = true;
1314 }
1315 }
1316
1317 if (!got_user) {
1318 if ((pace = talloc(talloc_tos(), canon_ace)) == NULL) {
1319 DEBUG(0,("malloc fail.\n"));
1320 return false;
1321 }
1322
1323 ZERO_STRUCTP(pace);
1324 pace->type = SMB_ACL_USER_OBJ;
1325 pace->owner_type = UID_ACE;
1326 pace->unix_ug.type = ID_TYPE_UID;
1327 pace->unix_ug.id = pst->st_ex_uid;
1328 pace->trustee = *pfile_owner_sid;
1329 pace->attr = ALLOW_ACE;
1330 pace->perms = unix_perms_to_acl_perms(pst->st_ex_mode, S_IRUSR, S_IWUSR, S_IXUSR);
1331 DLIST_ADD(*pp_ace, pace);
1332 }
1333
1334 if (!got_group) {
1335 if ((pace = talloc(talloc_tos(), canon_ace)) == NULL) {
1336 DEBUG(0,("malloc fail.\n"));
1337 return false;
1338 }
1339
1340 ZERO_STRUCTP(pace);
1341 pace->type = SMB_ACL_GROUP_OBJ;
1342 pace->owner_type = GID_ACE;
1343 pace->unix_ug.type = ID_TYPE_GID;
1344 pace->unix_ug.id = pst->st_ex_gid;
1345 pace->trustee = *pfile_grp_sid;
1346 pace->attr = ALLOW_ACE;
1347 pace->perms = unix_perms_to_acl_perms(pst->st_ex_mode, S_IRGRP, S_IWGRP, S_IXGRP);
1348 DLIST_ADD(*pp_ace, pace);
1349 }
1350
1351 if (!got_other) {
1352 if ((pace = talloc(talloc_tos(), canon_ace)) == NULL) {
1353 DEBUG(0,("malloc fail.\n"));
1354 return false;
1355 }
1356
1357 ZERO_STRUCTP(pace);
1358 pace->type = SMB_ACL_OTHER;
1359 pace->owner_type = WORLD_ACE;
1360 pace->unix_ug.type = ID_TYPE_NOT_SPECIFIED;
1361 pace->unix_ug.id = -1;
1362 pace->trustee = global_sid_World;
1363 pace->attr = ALLOW_ACE;
1364 pace->perms = unix_perms_to_acl_perms(pst->st_ex_mode, S_IROTH, S_IWOTH, S_IXOTH);
1365 DLIST_ADD(*pp_ace, pace);
1366 }
1367
1368 return true;
1369 }
1370
1371 /****************************************************************************
1372 A well formed POSIX file or default ACL has at least 3 entries, a
1373 SMB_ACL_USER_OBJ, SMB_ACL_GROUP_OBJ, SMB_ACL_OTHER_OBJ.
1374 In addition, the owner must always have at least read access.
1375 When using this call on set_acl, the pst struct has
1376 been modified to have a mode containing the default for this file or directory
1377 type.
1378 ****************************************************************************/
1379
1380 static bool ensure_canon_entry_valid_on_set(connection_struct *conn,
1381 canon_ace **pp_ace,
1382 bool is_default_acl,
1383 const struct share_params *params,
1384 const bool is_directory,
1385 const struct dom_sid *pfile_owner_sid,
1386 const struct dom_sid *pfile_grp_sid,
1387 const SMB_STRUCT_STAT *pst)
1388 {
1389 canon_ace *pace;
1390 canon_ace *pace_user = NULL;
1391 canon_ace *pace_group = NULL;
1392 canon_ace *pace_other = NULL;
1393 bool got_duplicate_user = false;
1394 bool got_duplicate_group = false;
1395
1396 for (pace = *pp_ace; pace; pace = pace->next) {
1397 trim_ace_perms(pace);
1398 if (pace->type == SMB_ACL_USER_OBJ) {
1399 ensure_minimal_owner_ace_perms(is_directory, pace);
1400 pace_user = pace;
1401 } else if (pace->type == SMB_ACL_GROUP_OBJ) {
1402 pace_group = pace;
1403 } else if (pace->type == SMB_ACL_OTHER) {
1404 pace_other = pace;
1405 }
1406 }
1407
1408 if (!pace_user) {
1409 canon_ace *pace_iter;
1410
1411 if ((pace = talloc(talloc_tos(), canon_ace)) == NULL) {
1412 DEBUG(0,("talloc fail.\n"));
1413 return false;
1414 }
1415
1416 ZERO_STRUCTP(pace);
1417 pace->type = SMB_ACL_USER_OBJ;
1418 pace->owner_type = UID_ACE;
1419 pace->unix_ug.type = ID_TYPE_UID;
1420 pace->unix_ug.id = pst->st_ex_uid;
1421 pace->trustee = *pfile_owner_sid;
1422 pace->attr = ALLOW_ACE;
1423 /* Start with existing user permissions, principle of least
1424 surprises for the user. */
1425 pace->perms = unix_perms_to_acl_perms(pst->st_ex_mode, S_IRUSR, S_IWUSR, S_IXUSR);
1426
1427 /* See if the owning user is in any of the other groups in
1428 the ACE, or if there's a matching user entry (by uid
1429 or in the case of ID_TYPE_BOTH by SID).
1430 If so, OR in the permissions from that entry. */
1431
1432
1433 for (pace_iter = *pp_ace; pace_iter; pace_iter = pace_iter->next) {
1434 if (pace_iter->type == SMB_ACL_USER &&
1435 pace_iter->unix_ug.id == pace->unix_ug.id) {
1436 pace->perms |= pace_iter->perms;
1437 } else if (pace_iter->type == SMB_ACL_GROUP_OBJ || pace_iter->type == SMB_ACL_GROUP) {
1438 if (dom_sid_equal(&pace->trustee, &pace_iter->trustee)) {
1439 pace->perms |= pace_iter->perms;
1440 } else if (uid_entry_in_group(conn, pace, pace_iter)) {
1441 pace->perms |= pace_iter->perms;
1442 }
1443 }
1444 }
1445
1446 if (pace->perms == 0) {
1447 /* If we only got an "everyone" perm, just use that. */
1448 if (pace_other)
1449 pace->perms = pace_other->perms;
1450 }
1451
1452 /*
1453 * Ensure we have default parameters for the
1454 * user (owner) even on default ACLs.
1455 */
1456 ensure_minimal_owner_ace_perms(is_directory, pace);
1457
1458 DLIST_ADD(*pp_ace, pace);
1459 pace_user = pace;
1460 }
1461
1462 if (!pace_group) {
1463 if ((pace = talloc(talloc_tos(), canon_ace)) == NULL) {
1464 DEBUG(0,("talloc fail.\n"));
1465 return false;
1466 }
1467
1468 ZERO_STRUCTP(pace);
1469 pace->type = SMB_ACL_GROUP_OBJ;
1470 pace->owner_type = GID_ACE;
1471 pace->unix_ug.type = ID_TYPE_GID;
1472 pace->unix_ug.id = pst->st_ex_gid;
1473 pace->trustee = *pfile_grp_sid;
1474 pace->attr = ALLOW_ACE;
1475
1476 /* If we only got an "everyone" perm, just use that. */
1477 if (pace_other) {
1478 pace->perms = pace_other->perms;
1479 } else {
1480 pace->perms = 0;
1481 }
1482
1483 DLIST_ADD(*pp_ace, pace);
1484 pace_group = pace;
1485 }
1486
1487 if (!pace_other) {
1488 if ((pace = talloc(talloc_tos(), canon_ace)) == NULL) {
1489 DEBUG(0,("talloc fail.\n"));
1490 return false;
1491 }
1492
1493 ZERO_STRUCTP(pace);
1494 pace->type = SMB_ACL_OTHER;
1495 pace->owner_type = WORLD_ACE;
1496 pace->unix_ug.type = ID_TYPE_NOT_SPECIFIED;
1497 pace->unix_ug.id = -1;
1498 pace->trustee = global_sid_World;
1499 pace->attr = ALLOW_ACE;
1500 pace->perms = 0;
1501
1502 DLIST_ADD(*pp_ace, pace);
1503 pace_other = pace;
1504 }
1505
1506 /* Ensure when setting a POSIX ACL, that the uid for a
1507 SMB_ACL_USER_OBJ ACE (the owner ACE entry) has a duplicate
1508 permission entry as an SMB_ACL_USER, and a gid for a
1509 SMB_ACL_GROUP_OBJ ACE (the primary group ACE entry) also has
1510 a duplicate permission entry as an SMB_ACL_GROUP. If not,
1511 then if the ownership or group ownership of this file or
1512 directory gets changed, the user or group can lose their
1513 access. */
1514
1515 for (pace = *pp_ace; pace; pace = pace->next) {
1516 if (pace->type == SMB_ACL_USER &&
1517 pace->unix_ug.id == pace_user->unix_ug.id) {
1518 /* Already got one. */
1519 got_duplicate_user = true;
1520 } else if (pace->type == SMB_ACL_GROUP &&
1521 pace->unix_ug.id == pace_group->unix_ug.id) {
1522 /* Already got one. */
1523 got_duplicate_group = true;
1524 } else if ((pace->type == SMB_ACL_GROUP)
1525 && (dom_sid_equal(&pace->trustee, &pace_user->trustee))) {
1526 /* If the SID owning the file appears
1527 * in a group entry, then we have
1528 * enough duplication, they will still
1529 * have access */
1530 got_duplicate_user = true;
1531 }
1532 }
1533
1534 /* If the SID is equal for the user and group that we need
1535 to add the duplicate for, add only the group */
1536 if (!got_duplicate_user && !got_duplicate_group
1537 && dom_sid_equal(&pace_group->trustee,
1538 &pace_user->trustee)) {
1539 /* Add a duplicate SMB_ACL_GROUP entry, this
1540 * will cover the owning SID as well, as it
1541 * will always be mapped to both a uid and
1542 * gid. */
1543
1544 if ((pace = talloc(talloc_tos(), canon_ace)) == NULL) {
1545 DEBUG(0,("talloc fail.\n"));
1546 return false;
1547 }
1548
1549 ZERO_STRUCTP(pace);
1550 pace->type = SMB_ACL_GROUP;;
1551 pace->owner_type = GID_ACE;
1552 pace->unix_ug.type = ID_TYPE_GID;
1553 pace->unix_ug.id = pace_group->unix_ug.id;
1554 pace->trustee = pace_group->trustee;
1555 pace->attr = pace_group->attr;
1556 pace->perms = pace_group->perms;
1557
1558 DLIST_ADD(*pp_ace, pace);
1559
1560 /* We're done here, make sure the
1561 statements below are not executed. */
1562 got_duplicate_user = true;
1563 got_duplicate_group = true;
1564 }
1565
1566 if (!got_duplicate_user) {
1567 /* Add a duplicate SMB_ACL_USER entry. */
1568 if ((pace = talloc(talloc_tos(), canon_ace)) == NULL) {
1569 DEBUG(0,("talloc fail.\n"));
1570 return false;
1571 }
1572
1573 ZERO_STRUCTP(pace);
1574 pace->type = SMB_ACL_USER;;
1575 pace->owner_type = UID_ACE;
1576 pace->unix_ug.type = ID_TYPE_UID;
1577 pace->unix_ug.id = pace_user->unix_ug.id;
1578 pace->trustee = pace_user->trustee;
1579 pace->attr = pace_user->attr;
1580 pace->perms = pace_user->perms;
1581
1582 DLIST_ADD(*pp_ace, pace);
1583
1584 got_duplicate_user = true;
1585 }
1586
1587 if (!got_duplicate_group) {
1588 /* Add a duplicate SMB_ACL_GROUP entry. */
1589 if ((pace = talloc(talloc_tos(), canon_ace)) == NULL) {
1590 DEBUG(0,("talloc fail.\n"));
1591 return false;
1592 }
1593
1594 ZERO_STRUCTP(pace);
1595 pace->type = SMB_ACL_GROUP;;
1596 pace->owner_type = GID_ACE;
1597 pace->unix_ug.type = ID_TYPE_GID;
1598 pace->unix_ug.id = pace_group->unix_ug.id;
1599 pace->trustee = pace_group->trustee;
1600 pace->attr = pace_group->attr;
1601 pace->perms = pace_group->perms;
1602
1603 DLIST_ADD(*pp_ace, pace);
1604
1605 got_duplicate_group = true;
1606 }
1607
1608 return true;
1609 }
1610
1611 /****************************************************************************
1612 Check if a POSIX ACL has the required SMB_ACL_USER_OBJ and SMB_ACL_GROUP_OBJ entries.
1613 If it does not have them, check if there are any entries where the trustee is the
1614 file owner or the owning group, and map these to SMB_ACL_USER_OBJ and SMB_ACL_GROUP_OBJ.
1615 Note we must not do this to default directory ACLs.
1616 ****************************************************************************/
1617
1618 static void check_owning_objs(canon_ace *ace, struct dom_sid *pfile_owner_sid, struct dom_sid *pfile_grp_sid)
1619 {
1620 bool got_user_obj, got_group_obj;
1621 canon_ace *current_ace;
1622 int i, entries;
1623
1624 entries = count_canon_ace_list(ace);
1625 got_user_obj = False;
1626 got_group_obj = False;
1627
1628 for (i=0, current_ace = ace; i < entries; i++, current_ace = current_ace->next) {
1629 if (current_ace->type == SMB_ACL_USER_OBJ)
1630 got_user_obj = True;
1631 else if (current_ace->type == SMB_ACL_GROUP_OBJ)
1632 got_group_obj = True;
1633 }
1634 if (got_user_obj && got_group_obj) {
1635 DEBUG(10,("check_owning_objs: ACL had owning user/group entries.\n"));
1636 return;
1637 }
1638
1639 for (i=0, current_ace = ace; i < entries; i++, current_ace = current_ace->next) {
1640 if (!got_user_obj && current_ace->owner_type == UID_ACE &&
1641 dom_sid_equal(&current_ace->trustee, pfile_owner_sid)) {
1642 current_ace->type = SMB_ACL_USER_OBJ;
1643 got_user_obj = True;
1644 }
1645 if (!got_group_obj && current_ace->owner_type == GID_ACE &&
1646 dom_sid_equal(&current_ace->trustee, pfile_grp_sid)) {
1647 current_ace->type = SMB_ACL_GROUP_OBJ;
1648 got_group_obj = True;
1649 }
1650 }
1651 if (!got_user_obj)
1652 DEBUG(10,("check_owning_objs: ACL is missing an owner entry.\n"));
1653 if (!got_group_obj)
1654 DEBUG(10,("check_owning_objs: ACL is missing an owning group entry.\n"));
1655 }
1656
1657 static bool add_current_ace_to_acl(files_struct *fsp, struct security_ace *psa,
1658 canon_ace **file_ace, canon_ace **dir_ace,
1659 bool *got_file_allow, bool *got_dir_allow,
1660 bool *all_aces_are_inherit_only,
1661 canon_ace *current_ace)
1662 {
1663
1664 /*
1665 * Map the given NT permissions into a UNIX mode_t containing only
1666 * S_I(R|W|X)USR bits.
1667 */
1668
1669 current_ace->perms |= map_nt_perms( &psa->access_mask, S_IRUSR);
1670 current_ace->attr = (psa->type == SEC_ACE_TYPE_ACCESS_ALLOWED) ? ALLOW_ACE : DENY_ACE;
1671
1672 /* Store the ace_flag. */
1673 current_ace->ace_flags = psa->flags;
1674
1675 /*
1676 * Now add the created ace to either the file list, the directory
1677 * list, or both. We *MUST* preserve the order here (hence we use
1678 * DLIST_ADD_END) as NT ACLs are order dependent.
1679 */
1680
1681 if (fsp->is_directory) {
1682
1683 /*
1684 * We can only add to the default POSIX ACE list if the ACE is
1685 * designed to be inherited by both files and directories.
1686 */
1687
1688 if ((psa->flags & (SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT)) ==
1689 (SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT)) {
1690
1691 canon_ace *current_dir_ace = current_ace;
1692 DLIST_ADD_END(*dir_ace, current_ace);
1693
1694 /*
1695 * Note if this was an allow ace. We can't process
1696 * any further deny ace's after this.
1697 */
1698
1699 if (current_ace->attr == ALLOW_ACE)
1700 *got_dir_allow = True;
1701
1702 if ((current_ace->attr == DENY_ACE) && *got_dir_allow) {
1703 DEBUG(0,("add_current_ace_to_acl: "
1704 "malformed ACL in "
1705 "inheritable ACL! Deny entry "
1706 "after Allow entry. Failing "
1707 "to set on file %s.\n",
1708 fsp_str_dbg(fsp)));
1709 return False;
1710 }
1711
1712 if( DEBUGLVL( 10 )) {
1713 dbgtext("add_current_ace_to_acl: adding dir ACL:\n");
1714 print_canon_ace( current_ace, 0);
1715 }
1716
1717 /*
1718 * If this is not an inherit only ACE we need to add a duplicate
1719 * to the file acl.
1720 */
1721
1722 if (!(psa->flags & SEC_ACE_FLAG_INHERIT_ONLY)) {
1723 canon_ace *dup_ace = dup_canon_ace(current_ace);
1724
1725 if (!dup_ace) {
1726 DEBUG(0,("add_current_ace_to_acl: malloc fail !\n"));
1727 return False;
1728 }
1729
1730 /*
1731 * We must not free current_ace here as its
1732 * pointer is now owned by the dir_ace list.
1733 */
1734 current_ace = dup_ace;
1735 /* We've essentially split this ace into two,
1736 * and added the ace with inheritance request
1737 * bits to the directory ACL. Drop those bits for
1738 * the ACE we're adding to the file list. */
1739 current_ace->ace_flags &= ~(SEC_ACE_FLAG_OBJECT_INHERIT|
1740 SEC_ACE_FLAG_CONTAINER_INHERIT|
1741 SEC_ACE_FLAG_INHERIT_ONLY);
1742 } else {
1743 /*
1744 * We must not free current_ace here as its
1745 * pointer is now owned by the dir_ace list.
1746 */
1747 current_ace = NULL;
1748 }
1749
1750 /*
1751 * current_ace is now either owned by file_ace
1752 * or is NULL. We can safely operate on current_dir_ace
1753 * to treat mapping for default acl entries differently
1754 * than access acl entries.
1755 */
1756
1757 if (current_dir_ace->owner_type == UID_ACE) {
1758 /*
1759 * We already decided above this is a uid,
1760 * for default acls ace's only CREATOR_OWNER
1761 * maps to ACL_USER_OBJ. All other uid
1762 * ace's are ACL_USER.
1763 */
1764 if (dom_sid_equal(&current_dir_ace->trustee,
1765 &global_sid_Creator_Owner)) {
1766 current_dir_ace->type = SMB_ACL_USER_OBJ;
1767 } else {
1768 current_dir_ace->type = SMB_ACL_USER;
1769 }
1770 }
1771
1772 if (current_dir_ace->owner_type == GID_ACE) {
1773 /*
1774 * We already decided above this is a gid,
1775 * for default acls ace's only CREATOR_GROUP
1776 * maps to ACL_GROUP_OBJ. All other uid
1777 * ace's are ACL_GROUP.
1778 */
1779 if (dom_sid_equal(&current_dir_ace->trustee,
1780 &global_sid_Creator_Group)) {
1781 current_dir_ace->type = SMB_ACL_GROUP_OBJ;
1782 } else {
1783 current_dir_ace->type = SMB_ACL_GROUP;
1784 }
1785 }
1786 }
1787 }
1788
1789 /*
1790 * Only add to the file ACL if not inherit only.
1791 */
1792
1793 if (current_ace && !(psa->flags & SEC_ACE_FLAG_INHERIT_ONLY)) {
1794 DLIST_ADD_END(*file_ace, current_ace);
1795
1796 /*
1797 * Note if this was an allow ace. We can't process
1798 * any further deny ace's after this.
1799 */
1800
1801 if (current_ace->attr == ALLOW_ACE)
1802 *got_file_allow = True;
1803
1804 if ((current_ace->attr == DENY_ACE) && *got_file_allow) {
1805 DEBUG(0,("add_current_ace_to_acl: malformed "
1806 "ACL in file ACL ! Deny entry after "
1807 "Allow entry. Failing to set on file "
1808 "%s.\n", fsp_str_dbg(fsp)));
1809 return False;
1810 }
1811
1812 if( DEBUGLVL( 10 )) {
1813 dbgtext("add_current_ace_to_acl: adding file ACL:\n");
1814 print_canon_ace( current_ace, 0);
1815 }
1816 *all_aces_are_inherit_only = False;
1817 /*
1818 * We must not free current_ace here as its
1819 * pointer is now owned by the file_ace list.
1820 */
1821 current_ace = NULL;
1822 }
1823
1824 /*
1825 * Free if ACE was not added.
1826 */
1827
1828 TALLOC_FREE(current_ace);
1829 return true;
1830 }
1831
1832 /****************************************************************************
1833 Unpack a struct security_descriptor into two canonical ace lists.
1834 ****************************************************************************/
1835
1836 static bool create_canon_ace_lists(files_struct *fsp,
1837 const SMB_STRUCT_STAT *pst,
1838 struct dom_sid *pfile_owner_sid,
1839 struct dom_sid *pfile_grp_sid,
1840 canon_ace **ppfile_ace,
1841 canon_ace **ppdir_ace,
1842 const struct security_acl *dacl)
1843 {
1844 bool all_aces_are_inherit_only = (fsp->is_directory ? True : False);
1845 canon_ace *file_ace = NULL;
1846 canon_ace *dir_ace = NULL;
1847 canon_ace *current_ace = NULL;
1848 bool got_dir_allow = False;
1849 bool got_file_allow = False;
1850 uint32_t i, j;
1851
1852 *ppfile_ace = NULL;
1853 *ppdir_ace = NULL;
1854
1855 /*
1856 * Convert the incoming ACL into a more regular form.
1857 */
1858
1859 for(i = 0; i < dacl->num_aces; i++) {
1860 struct security_ace *psa = &dacl->aces[i];
1861
1862 if((psa->type != SEC_ACE_TYPE_ACCESS_ALLOWED) && (psa->type != SEC_ACE_TYPE_ACCESS_DENIED)) {
1863 DEBUG(3,("create_canon_ace_lists: unable to set anything but an ALLOW or DENY ACE.\n"));
1864 return False;
1865 }
1866 }
1867
1868 /*
1869 * Deal with the fact that NT 4.x re-writes the canonical format
1870 * that we return for default ACLs. If a directory ACE is identical
1871 * to a inherited directory ACE then NT changes the bits so that the
1872 * first ACE is set to OI|IO and the second ACE for this SID is set
1873 * to CI. We need to repair this. JRA.
1874 */
1875
1876 for(i = 0; i < dacl->num_aces; i++) {
1877 struct security_ace *psa1 = &dacl->aces[i];
1878
1879 for (j = i + 1; j < dacl->num_aces; j++) {
1880 struct security_ace *psa2 = &dacl->aces[j];
1881
1882 if (psa1->access_mask != psa2->access_mask)
1883 continue;
1884
1885 if (!dom_sid_equal(&psa1->trustee, &psa2->trustee))
1886 continue;
1887
1888 /*
1889 * Ok - permission bits and SIDs are equal.
1890 * Check if flags were re-written.
1891 */
1892
1893 if (psa1->flags & SEC_ACE_FLAG_INHERIT_ONLY) {
1894
1895 psa1->flags |= (psa2->flags & (SEC_ACE_FLAG_CONTAINER_INHERIT|SEC_ACE_FLAG_OBJECT_INHERIT));
1896 psa2->flags &= ~(SEC_ACE_FLAG_CONTAINER_INHERIT|SEC_ACE_FLAG_OBJECT_INHERIT);
1897
1898 } else if (psa2->flags & SEC_ACE_FLAG_INHERIT_ONLY) {
1899
1900 psa2->flags |= (psa1->flags & (SEC_ACE_FLAG_CONTAINER_INHERIT|SEC_ACE_FLAG_OBJECT_INHERIT));
1901 psa1->flags &= ~(SEC_ACE_FLAG_CONTAINER_INHERIT|SEC_ACE_FLAG_OBJECT_INHERIT);
1902
1903 }
1904 }
1905 }
1906
1907 for(i = 0; i < dacl->num_aces; i++) {
1908 struct security_ace *psa = &dacl->aces[i];
1909
1910 /*
1911 * Create a canon_ace entry representing this NT DACL ACE.
1912 */
1913
1914 if ((current_ace = talloc(talloc_tos(), canon_ace)) == NULL) {
1915 free_canon_ace_list(file_ace);
1916 free_canon_ace_list(dir_ace);
1917 DEBUG(0,("create_canon_ace_lists: malloc fail.\n"));
1918 return False;
1919 }
1920
1921 ZERO_STRUCTP(current_ace);
1922
1923 sid_copy(&current_ace->trustee, &psa->trustee);
1924
1925 /*
1926 * Try and work out if the SID is a user or group
1927 * as we need to flag these differently for POSIX.
1928 * Note what kind of a POSIX ACL this should map to.
1929 */
1930
1931 if( dom_sid_equal(&current_ace->trustee, &global_sid_World)) {
1932 current_ace->owner_type = WORLD_ACE;
1933 current_ace->unix_ug.type = ID_TYPE_NOT_SPECIFIED;
1934 current_ace->unix_ug.id = -1;
1935 current_ace->type = SMB_ACL_OTHER;
1936 } else if (dom_sid_equal(&current_ace->trustee, &global_sid_Creator_Owner)) {
1937 current_ace->owner_type = UID_ACE;
1938 current_ace->unix_ug.type = ID_TYPE_UID;
1939 current_ace->unix_ug.id = pst->st_ex_uid;
1940 current_ace->type = SMB_ACL_USER_OBJ;
1941
1942 /*
1943 * The Creator Owner entry only specifies inheritable permissions,
1944 * never access permissions. WinNT doesn't always set the ACE to
1945 * INHERIT_ONLY, though.
1946 */
1947
1948 psa->flags |= SEC_ACE_FLAG_INHERIT_ONLY;
1949
1950 } else if (dom_sid_equal(&current_ace->trustee, &global_sid_Creator_Group)) {
1951 current_ace->owner_type = GID_ACE;
1952 current_ace->unix_ug.type = ID_TYPE_GID;
1953 current_ace->unix_ug.id = pst->st_ex_gid;
1954 current_ace->type = SMB_ACL_GROUP_OBJ;
1955
1956 /*
1957 * The Creator Group entry only specifies inheritable permissions,
1958 * never access permissions. WinNT doesn't always set the ACE to
1959 * INHERIT_ONLY, though.
1960 */
1961 psa->flags |= SEC_ACE_FLAG_INHERIT_ONLY;
1962
1963 } else {
1964 struct unixid unixid;
1965
1966 if (!sids_to_unixids(&current_ace->trustee, 1, &unixid)) {
1967 free_canon_ace_list(file_ace);
1968 free_canon_ace_list(dir_ace);
1969 TALLOC_FREE(current_ace);
1970 DEBUG(0, ("create_canon_ace_lists: sids_to_unixids "
1971 "failed for %s (allocation failure)\n",
1972 sid_string_dbg(&current_ace->trustee)));
1973 return false;
1974 }
1975
1976 if (unixid.type == ID_TYPE_BOTH) {
1977 /*
1978 * We must add both a user and group
1979 * entry POSIX_ACL.
1980 * This is due to the fact that in POSIX
1981 * user entries are more specific than
1982 * groups.
1983 */
1984 current_ace->owner_type = UID_ACE;
1985 current_ace->unix_ug.type = ID_TYPE_UID;
1986 current_ace->unix_ug.id = unixid.id;
1987 current_ace->type =
1988 (unixid.id == pst->st_ex_uid) ?
1989 SMB_ACL_USER_OBJ :
1990 SMB_ACL_USER;
1991
1992 /* Add the user object to the posix ACL,
1993 and proceed to the group mapping
1994 below. This handles the talloc_free
1995 of current_ace if not added for some
1996 reason */
1997 if (!add_current_ace_to_acl(fsp,
1998 psa,
1999 &file_ace,
2000 &dir_ace,
2001 &got_file_allow,
2002 &got_dir_allow,
2003 &all_aces_are_inherit_only,
2004 current_ace)) {
2005 free_canon_ace_list(file_ace);
2006 free_canon_ace_list(dir_ace);
2007 return false;
2008 }
2009
2010 if ((current_ace = talloc(talloc_tos(),
2011 canon_ace)) == NULL) {
2012 free_canon_ace_list(file_ace);
2013 free_canon_ace_list(dir_ace);
2014 DEBUG(0,("create_canon_ace_lists: "
2015 "malloc fail.\n"));
2016 return False;
2017 }
2018
2019 ZERO_STRUCTP(current_ace);
2020
2021 sid_copy(&current_ace->trustee, &psa->trustee);
2022
2023 current_ace->unix_ug.type = ID_TYPE_GID;
2024 current_ace->unix_ug.id = unixid.id;
2025 current_ace->owner_type = GID_ACE;
2026 /* If it's the primary group, this is a
2027 group_obj, not a group. */
2028 if (current_ace->unix_ug.id == pst->st_ex_gid) {
2029 current_ace->type = SMB_ACL_GROUP_OBJ;
2030 } else {
2031 current_ace->type = SMB_ACL_GROUP;
2032 }
2033
2034 } else if (unixid.type == ID_TYPE_UID) {
2035 current_ace->owner_type = UID_ACE;
2036 current_ace->unix_ug.type = ID_TYPE_UID;
2037 current_ace->unix_ug.id = unixid.id;
2038 /* If it's the owning user, this is a user_obj,
2039 not a user. */
2040 if (current_ace->unix_ug.id == pst->st_ex_uid) {
2041 current_ace->type = SMB_ACL_USER_OBJ;
2042 } else {
2043 current_ace->type = SMB_ACL_USER;
2044 }
2045 } else if (unixid.type == ID_TYPE_GID) {
2046 current_ace->unix_ug.type = ID_TYPE_GID;
2047 current_ace->unix_ug.id = unixid.id;
2048 current_ace->owner_type = GID_ACE;
2049 /* If it's the primary group, this is a
2050 group_obj, not a group. */
2051 if (current_ace->unix_ug.id == pst->st_ex_gid) {
2052 current_ace->type = SMB_ACL_GROUP_OBJ;
2053 } else {
2054 current_ace->type = SMB_ACL_GROUP;
2055 }
2056 } else {
2057 /*
2058 * Silently ignore map failures in non-mappable SIDs (NT Authority, BUILTIN etc).
2059 */
2060
2061 if (non_mappable_sid(&psa->trustee)) {
2062 DEBUG(10, ("create_canon_ace_lists: ignoring "
2063 "non-mappable SID %s\n",
2064 sid_string_dbg(&psa->trustee)));
2065 TALLOC_FREE(current_ace);
2066 continue;
2067 }
2068
2069 if (lp_force_unknown_acl_user(SNUM(fsp->conn))) {
2070 DEBUG(10, ("create_canon_ace_lists: ignoring "
2071 "unknown or foreign SID %s\n",
2072 sid_string_dbg(&psa->trustee)));
2073 TALLOC_FREE(current_ace);
2074 continue;
2075 }
2076
2077 free_canon_ace_list(file_ace);
2078 free_canon_ace_list(dir_ace);
2079 DEBUG(0, ("create_canon_ace_lists: unable to map SID "
2080 "%s to uid or gid.\n",
2081 sid_string_dbg(&current_ace->trustee)));
2082 TALLOC_FREE(current_ace);
2083 return false;
2084 }
2085 }
2086
2087 /* handles the talloc_free of current_ace if not added for some reason */
2088 if (!add_current_ace_to_acl(fsp, psa, &file_ace, &dir_ace,
2089 &got_file_allow, &got_dir_allow,
2090 &all_aces_are_inherit_only, current_ace)) {
2091 free_canon_ace_list(file_ace);
2092 free_canon_ace_list(dir_ace);
2093 return false;
2094 }
2095 }
2096
2097 if (fsp->is_directory && all_aces_are_inherit_only) {
2098 /*
2099 * Windows 2000 is doing one of these weird 'inherit acl'
2100 * traverses to conserve NTFS ACL resources. Just pretend
2101 * there was no DACL sent. JRA.
2102 */
2103
2104 DEBUG(10,("create_canon_ace_lists: Win2k inherit acl traverse. Ignoring DACL.\n"));
2105 free_canon_ace_list(file_ace);
2106 free_canon_ace_list(dir_ace);
2107 file_ace = NULL;
2108 dir_ace = NULL;
2109 } else {
2110 /*
2111 * Check if we have SMB_ACL_USER_OBJ and SMB_ACL_GROUP_OBJ entries in
2112 * the file ACL. If we don't have them, check if any SMB_ACL_USER/SMB_ACL_GROUP
2113 * entries can be converted to *_OBJ. Don't do this for the default
2114 * ACL, we will create them separately for this if needed inside
2115 * ensure_canon_entry_valid_on_set().
2116 */
2117 if (file_ace) {
2118 check_owning_objs(file_ace, pfile_owner_sid, pfile_grp_sid);
2119 }
2120 }
2121
2122 *ppfile_ace = file_ace;
2123 *ppdir_ace = dir_ace;
2124
2125 return True;
2126 }
2127
2128 /****************************************************************************
2129 ASCII art time again... JRA :-).
2130
2131 We have 4 cases to process when moving from an NT ACL to a POSIX ACL. Firstly,
2132 we insist the ACL is in canonical form (ie. all DENY entries preceede ALLOW
2133 entries). Secondly, the merge code has ensured that all duplicate SID entries for
2134 allow or deny have been merged, so the same SID can only appear once in the deny
2135 list or once in the allow list.
2136
2137 We then process as follows :
2138
2139 ---------------------------------------------------------------------------
2140 First pass - look for a Everyone DENY entry.
2141
2142 If it is deny all (rwx) trunate the list at this point.
2143 Else, walk the list from this point and use the deny permissions of this
2144 entry as a mask on all following allow entries. Finally, delete
2145 the Everyone DENY entry (we have applied it to everything possible).
2146
2147 In addition, in this pass we remove any DENY entries that have
2148 no permissions (ie. they are a DENY nothing).
2149 ---------------------------------------------------------------------------
2150 Second pass - only deal with deny user entries.
2151
2152 DENY user1 (perms XXX)
2153
2154 new_perms = 0
2155 for all following allow group entries where user1 is in group
2156 new_perms |= group_perms;
2157
2158 user1 entry perms = new_perms & ~ XXX;
2159
2160 Convert the deny entry to an allow entry with the new perms and
2161 push to the end of the list. Note if the user was in no groups
2162 this maps to a specific allow nothing entry for this user.
2163
2164 The common case from the NT ACL choser (userX deny all) is
2165 optimised so we don't do the group lookup - we just map to
2166 an allow nothing entry.
2167
2168 What we're doing here is inferring the allow permissions the
2169 person setting the ACE on user1 wanted by looking at the allow
2170 permissions on the groups the user is currently in. This will
2171 be a snapshot, depending on group membership but is the best
2172 we can do and has the advantage of failing closed rather than
2173 open.
2174 ---------------------------------------------------------------------------
2175 Third pass - only deal with deny group entries.
2176
2177 DENY group1 (perms XXX)
2178
2179 for all following allow user entries where user is in group1
2180 user entry perms = user entry perms & ~ XXX;
2181
2182 If there is a group Everyone allow entry with permissions YYY,
2183 convert the group1 entry to an allow entry and modify its
2184 permissions to be :
2185
2186 new_perms = YYY & ~ XXX
2187
2188 and push to the end of the list.
2189
2190 If there is no group Everyone allow entry then convert the
2191 group1 entry to a allow nothing entry and push to the end of the list.
2192
2193 Note that the common case from the NT ACL choser (groupX deny all)
2194 cannot be optimised here as we need to modify user entries who are
2195 in the group to change them to a deny all also.
2196
2197 What we're doing here is modifying the allow permissions of
2198 user entries (which are more specific in POSIX ACLs) to mask
2199 out the explicit deny set on the group they are in. This will
2200 be a snapshot depending on current group membership but is the
2201 best we can do and has the advantage of failing closed rather
2202 than open.
2203 ---------------------------------------------------------------------------
2204 Fourth pass - cope with cumulative permissions.
2205
2206 for all allow user entries, if there exists an allow group entry with
2207 more permissive permissions, and the user is in that group, rewrite the
2208 allow user permissions to contain both sets of permissions.
2209
2210 Currently the code for this is #ifdef'ed out as these semantics make
2211 no sense to me. JRA.
2212 ---------------------------------------------------------------------------
2213
2214 Note we *MUST* do the deny user pass first as this will convert deny user
2215 entries into allow user entries which can then be processed by the deny
2216 group pass.
2217
2218 The above algorithm took a *lot* of thinking about - hence this
2219 explaination :-). JRA.
2220 ****************************************************************************/
2221
2222 /****************************************************************************
2223 Process a canon_ace list entries. This is very complex code. We need
2224 to go through and remove the "deny" permissions from any allow entry that matches
2225 the id of this entry. We have already refused any NT ACL that wasn't in correct
2226 order (DENY followed by ALLOW). If any allow entry ends up with zero permissions,
2227 we just remove it (to fail safe). We have already removed any duplicate ace
2228 entries. Treat an "Everyone" DENY_ACE as a special case - use it to mask all
2229 allow entries.
2230 ****************************************************************************/
2231
2232 static void process_deny_list(connection_struct *conn, canon_ace **pp_ace_list )
2233 {
2234 canon_ace *ace_list = *pp_ace_list;
2235 canon_ace *curr_ace = NULL;
2236 canon_ace *curr_ace_next = NULL;
2237
2238 /* Pass 1 above - look for an Everyone, deny entry. */
2239
2240 for (curr_ace = ace_list; curr_ace; curr_ace = curr_ace_next) {
2241 canon_ace *allow_ace_p;
2242
2243 curr_ace_next = curr_ace->next; /* So we can't lose the link. */
2244
2245 if (curr_ace->attr != DENY_ACE)
2246 continue;
2247
2248 if (curr_ace->perms == (mode_t)0) {
2249
2250 /* Deny nothing entry - delete. */
2251
2252 DLIST_REMOVE(ace_list, curr_ace);
2253 continue;
2254 }
2255
2256 if (!dom_sid_equal(&curr_ace->trustee, &global_sid_World))
2257 continue;
2258
2259 /* JRATEST - assert. */
2260 SMB_ASSERT(curr_ace->owner_type == WORLD_ACE);
2261
2262 if (curr_ace->perms == ALL_ACE_PERMS) {
2263
2264 /*
2265 * Optimisation. This is a DENY_ALL to Everyone. Truncate the
2266 * list at this point including this entry.
2267 */
2268
2269 canon_ace *prev_entry = DLIST_PREV(curr_ace);
2270
2271 free_canon_ace_list( curr_ace );
2272 if (prev_entry)
2273 DLIST_REMOVE(ace_list, prev_entry);
2274 else {
2275 /* We deleted the entire list. */
2276 ace_list = NULL;
2277 }
2278 break;
2279 }
2280
2281 for (allow_ace_p = curr_ace->next; allow_ace_p; allow_ace_p = allow_ace_p->next) {
2282
2283 /*
2284 * Only mask off allow entries.
2285 */
2286
2287 if (allow_ace_p->attr != ALLOW_ACE)
2288 continue;
2289
2290 allow_ace_p->perms &= ~curr_ace->perms;
2291 }
2292
2293 /*
2294 * Now it's been applied, remove it.
2295 */
2296
2297 DLIST_REMOVE(ace_list, curr_ace);
2298 }
2299
2300 /* Pass 2 above - deal with deny user entries. */
2301
2302 for (curr_ace = ace_list; curr_ace; curr_ace = curr_ace_next) {
2303 mode_t new_perms = (mode_t)0;
2304 canon_ace *allow_ace_p;
2305
2306 curr_ace_next = curr_ace->next; /* So we can't lose the link. */
2307
2308 if (curr_ace->attr != DENY_ACE)
2309 continue;
2310
2311 if (curr_ace->owner_type != UID_ACE)
2312 continue;
2313
2314 if (curr_ace->perms == ALL_ACE_PERMS) {
2315
2316 /*
2317 * Optimisation - this is a deny everything to this user.
2318 * Convert to an allow nothing and push to the end of the list.
2319 */
2320
2321 curr_ace->attr = ALLOW_ACE;
2322 curr_ace->perms = (mode_t)0;
2323 DLIST_DEMOTE(ace_list, curr_ace);
2324 continue;
2325 }
2326
2327 for (allow_ace_p = curr_ace->next; allow_ace_p; allow_ace_p = allow_ace_p->next) {
2328
2329 if (allow_ace_p->attr != ALLOW_ACE)
2330 continue;
2331
2332 /* We process GID_ACE and WORLD_ACE entries only. */
2333
2334 if (allow_ace_p->owner_type == UID_ACE)
2335 continue;
2336
2337 if (uid_entry_in_group(conn, curr_ace, allow_ace_p))
2338 new_perms |= allow_ace_p->perms;
2339 }
2340
2341 /*
2342 * Convert to a allow entry, modify the perms and push to the end
2343 * of the list.
2344 */
2345
2346 curr_ace->attr = ALLOW_ACE;
2347 curr_ace->perms = (new_perms & ~curr_ace->perms);
2348 DLIST_DEMOTE(ace_list, curr_ace);
2349 }
2350
2351 /* Pass 3 above - deal with deny group entries. */
2352
2353 for (curr_ace = ace_list; curr_ace; curr_ace = curr_ace_next) {
2354 canon_ace *allow_ace_p;
2355 canon_ace *allow_everyone_p = NULL;
2356
2357 curr_ace_next = curr_ace->next; /* So we can't lose the link. */
2358
2359 if (curr_ace->attr != DENY_ACE)
2360 continue;
2361
2362 if (curr_ace->owner_type != GID_ACE)
2363 continue;
2364
2365 for (allow_ace_p = curr_ace->next; allow_ace_p; allow_ace_p = allow_ace_p->next) {
2366
2367 if (allow_ace_p->attr != ALLOW_ACE)
2368 continue;
2369
2370 /* Store a pointer to the Everyone allow, if it exists. */
2371 if (allow_ace_p->owner_type == WORLD_ACE)
2372 allow_everyone_p = allow_ace_p;
2373
2374 /* We process UID_ACE entries only. */
2375
2376 if (allow_ace_p->owner_type != UID_ACE)
2377 continue;
2378
2379 /* Mask off the deny group perms. */
2380
2381 if (uid_entry_in_group(conn, allow_ace_p, curr_ace))
2382 allow_ace_p->perms &= ~curr_ace->perms;
2383 }
2384
2385 /*
2386 * Convert the deny to an allow with the correct perms and
2387 * push to the end of the list.
2388 */
2389
2390 curr_ace->attr = ALLOW_ACE;
2391 if (allow_everyone_p)
2392 curr_ace->perms = allow_everyone_p->perms & ~curr_ace->perms;
2393 else
2394 curr_ace->perms = (mode_t)0;
2395 DLIST_DEMOTE(ace_list, curr_ace);
2396 }
2397
2398 /* Doing this fourth pass allows Windows semantics to be layered
2399 * on top of POSIX semantics. I'm not sure if this is desirable.
2400 * For example, in W2K ACLs there is no way to say, "Group X no
2401 * access, user Y full access" if user Y is a member of group X.
2402 * This seems completely broken semantics to me.... JRA.
2403 */
2404
2405 #if 0
2406 /* Pass 4 above - deal with allow entries. */
2407
2408 for (curr_ace = ace_list; curr_ace; curr_ace = curr_ace_next) {
2409 canon_ace *allow_ace_p;
2410
2411 curr_ace_next = curr_ace->next; /* So we can't lose the link. */
2412
2413 if (curr_ace->attr != ALLOW_ACE)
2414 continue;
2415
2416 if (curr_ace->owner_type != UID_ACE)
2417 continue;
2418
2419 for (allow_ace_p = ace_list; allow_ace_p; allow_ace_p = allow_ace_p->next) {
2420
2421 if (allow_ace_p->attr != ALLOW_ACE)
2422 continue;
2423
2424 /* We process GID_ACE entries only. */
2425
2426 if (allow_ace_p->owner_type != GID_ACE)
2427 continue;
2428
2429 /* OR in the group perms. */
2430
2431 if (uid_entry_in_group(conn, curr_ace, allow_ace_p))
2432 curr_ace->perms |= allow_ace_p->perms;
2433 }
2434 }
2435 #endif
2436
2437 *pp_ace_list = ace_list;
2438 }
2439
2440 /****************************************************************************
2441 Unpack a struct security_descriptor into two canonical ace lists. We don't depend on this
2442 succeeding.
2443 ****************************************************************************/
2444
2445 static bool unpack_canon_ace(files_struct *fsp,
2446 const SMB_STRUCT_STAT *pst,
2447 struct dom_sid *pfile_owner_sid,
2448 struct dom_sid *pfile_grp_sid,
2449 canon_ace **ppfile_ace,
2450 canon_ace **ppdir_ace,
2451 uint32_t security_info_sent,
2452 const struct security_descriptor *psd)
2453 {
2454 canon_ace *file_ace = NULL;
2455 canon_ace *dir_ace = NULL;
2456
2457 *ppfile_ace = NULL;
2458 *ppdir_ace = NULL;
2459
2460 if(security_info_sent == 0) {
2461 DEBUG(0,("unpack_canon_ace: no security info sent !\n"));
2462 return False;
2463 }
2464
2465 /*
2466 * If no DACL then this is a chown only security descriptor.
2467 */
2468
2469 if(!(security_info_sent & SECINFO_DACL) || !psd->dacl)
2470 return True;
2471
2472 /*
2473 * Now go through the DACL and create the canon_ace lists.
2474 */
2475
2476 if (!create_canon_ace_lists(fsp, pst, pfile_owner_sid, pfile_grp_sid,
2477 &file_ace, &dir_ace, psd->dacl)) {
2478 return False;
2479 }
2480
2481 if ((file_ace == NULL) && (dir_ace == NULL)) {
2482 /* W2K traverse DACL set - ignore. */
2483 return True;
2484 }
2485
2486 /*
2487 * Go through the canon_ace list and merge entries
2488 * belonging to identical users of identical allow or deny type.
2489 * We can do this as all deny entries come first, followed by
2490 * all allow entries (we have mandated this before accepting this acl).
2491 */
2492
2493 print_canon_ace_list( "file ace - before merge", file_ace);
2494 merge_aces( &file_ace, false);
2495
2496 print_canon_ace_list( "dir ace - before merge", dir_ace);
2497 merge_aces( &dir_ace, true);
2498
2499 /*
2500 * NT ACLs are order dependent. Go through the acl lists and
2501 * process DENY entries by masking the allow entries.
2502 */
2503
2504 print_canon_ace_list( "file ace - before deny", file_ace);
2505 process_deny_list(fsp->conn, &file_ace);
2506
2507 print_canon_ace_list( "dir ace - before deny", dir_ace);
2508 process_deny_list(fsp->conn, &dir_ace);
2509
2510 /*
2511 * A well formed POSIX file or default ACL has at least 3 entries, a
2512 * SMB_ACL_USER_OBJ, SMB_ACL_GROUP_OBJ, SMB_ACL_OTHER_OBJ
2513 * and optionally a mask entry. Ensure this is the case.
2514 */
2515
2516 print_canon_ace_list( "file ace - before valid", file_ace);
2517
2518 if (!ensure_canon_entry_valid_on_set(fsp->conn, &file_ace, false, fsp->conn->params,
2519 fsp->is_directory, pfile_owner_sid, pfile_grp_sid, pst)) {
2520 free_canon_ace_list(file_ace);
2521 free_canon_ace_list(dir_ace);
2522 return False;
2523 }
2524
2525 print_canon_ace_list( "dir ace - before valid", dir_ace);
2526
2527 if (dir_ace && !ensure_canon_entry_valid_on_set(fsp->conn, &dir_ace, true, fsp->conn->params,
2528 fsp->is_directory, pfile_owner_sid, pfile_grp_sid, pst)) {
2529 free_canon_ace_list(file_ace);
2530 free_canon_ace_list(dir_ace);
2531 return False;
2532 }
2533
2534 print_canon_ace_list( "file ace - return", file_ace);
2535 print_canon_ace_list( "dir ace - return", dir_ace);
2536
2537 *ppfile_ace = file_ace;
2538 *ppdir_ace = dir_ace;
2539 return True;
2540
2541 }
2542
2543 /******************************************************************************
2544 When returning permissions, try and fit NT display
2545 semantics if possible. Note the the canon_entries here must have been malloced.
2546 The list format should be - first entry = owner, followed by group and other user
2547 entries, last entry = other.
2548
2549 Note that this doesn't exactly match the NT semantics for an ACL. As POSIX entries
2550 are not ordered, and match on the most specific entry rather than walking a list,
2551 then a simple POSIX permission of rw-r--r-- should really map to 5 entries,
2552
2553 Entry 0: owner : deny all except read and write.
2554 Entry 1: owner : allow read and write.
2555 Entry 2: group : deny all except read.
2556 Entry 3: group : allow read.
2557 Entry 4: Everyone : allow read.
2558
2559 But NT cannot display this in their ACL editor !
2560 ********************************************************************************/
2561
2562 static void arrange_posix_perms(const char *filename, canon_ace **pp_list_head)
2563 {
2564 canon_ace *l_head = *pp_list_head;
2565 canon_ace *owner_ace = NULL;
2566 canon_ace *other_ace = NULL;
2567 canon_ace *ace = NULL;
2568
2569 for (ace = l_head; ace; ace = ace->next) {
2570 if (ace->type == SMB_ACL_USER_OBJ)
2571 owner_ace = ace;
2572 else if (ace->type == SMB_ACL_OTHER) {
2573 /* Last ace - this is "other" */
2574 other_ace = ace;
2575 }
2576 }
2577
2578 if (!owner_ace || !other_ace) {
2579 DEBUG(0,("arrange_posix_perms: Invalid POSIX permissions for file %s, missing owner or other.\n",
2580 filename ));
2581 return;
2582 }
2583
2584 /*
2585 * The POSIX algorithm applies to owner first, and other last,
2586 * so ensure they are arranged in this order.
2587 */
2588
2589 if (owner_ace) {
2590 DLIST_PROMOTE(l_head, owner_ace);
2591 }
2592
2593 if (other_ace) {
2594 DLIST_DEMOTE(l_head, other_ace);
2595 }
2596
2597 /* We have probably changed the head of the list. */
2598
2599 *pp_list_head = l_head;
2600 }
2601
2602 /****************************************************************************
2603 Create a linked list of canonical ACE entries.
2604 ****************************************************************************/
2605
2606 static canon_ace *canonicalise_acl(struct connection_struct *conn,
2607 const char *fname, SMB_ACL_T posix_acl,
2608 const SMB_STRUCT_STAT *psbuf,
2609 const struct dom_sid *powner, const struct dom_sid *pgroup, struct pai_val *pal, SMB_ACL_TYPE_T the_acl_type)
2610 {
2611 mode_t acl_mask = (S_IRUSR|S_IWUSR|S_IXUSR);
2612 canon_ace *l_head = NULL;
2613 canon_ace *ace = NULL;
2614 canon_ace *next_ace = NULL;
2615 int entry_id = SMB_ACL_FIRST_ENTRY;
2616 bool is_default_acl = (the_acl_type == SMB_ACL_TYPE_DEFAULT);
2617 SMB_ACL_ENTRY_T entry;
2618 size_t ace_count;
2619
2620 while ( posix_acl && (sys_acl_get_entry(posix_acl, entry_id, &entry) == 1)) {
2621 SMB_ACL_TAG_T tagtype;
2622 SMB_ACL_PERMSET_T permset;
2623 struct dom_sid sid;
2624 struct unixid unix_ug;
2625 enum ace_owner owner_type;
2626
2627 entry_id = SMB_ACL_NEXT_ENTRY;
2628
2629 if (sys_acl_get_tag_type(entry, &tagtype) == -1)
2630 continue;
2631
2632 if (sys_acl_get_permset(entry, &permset) == -1)
2633 continue;
2634
2635 /* Decide which SID to use based on the ACL type. */
2636 switch(tagtype) {
2637 case SMB_ACL_USER_OBJ:
2638 /* Get the SID from the owner. */
2639 sid_copy(&sid, powner);
2640 unix_ug.type = ID_TYPE_UID;
2641 unix_ug.id = psbuf->st_ex_uid;
2642 owner_type = UID_ACE;
2643 break;
2644 case SMB_ACL_USER:
2645 {
2646 uid_t *puid = (uid_t *)sys_acl_get_qualifier(entry);
2647 if (puid == NULL) {
2648 DEBUG(0,("canonicalise_acl: Failed to get uid.\n"));
2649 continue;
2650 }
2651 uid_to_sid( &sid, *puid);
2652 unix_ug.type = ID_TYPE_UID;
2653 unix_ug.id = *puid;
2654 owner_type = UID_ACE;
2655 break;
2656 }
2657 case SMB_ACL_GROUP_OBJ:
2658 /* Get the SID from the owning group. */
2659 sid_copy(&sid, pgroup);
2660 unix_ug.type = ID_TYPE_GID;
2661 unix_ug.id = psbuf->st_ex_gid;
2662 owner_type = GID_ACE;
2663 break;
2664 case SMB_ACL_GROUP:
2665 {
2666 gid_t *pgid = (gid_t *)sys_acl_get_qualifier(entry);
2667 if (pgid == NULL) {
2668 DEBUG(0,("canonicalise_acl: Failed to get gid.\n"));
2669 continue;
2670 }
2671 gid_to_sid( &sid, *pgid);
2672 unix_ug.type = ID_TYPE_GID;
2673 unix_ug.id = *pgid;
2674 owner_type = GID_ACE;
2675 break;
2676 }
2677 case SMB_ACL_MASK:
2678 acl_mask = convert_permset_to_mode_t(permset);
2679 continue; /* Don't count the mask as an entry. */
2680 case SMB_ACL_OTHER:
2681 /* Use the Everyone SID */
2682 sid = global_sid_World;
2683 unix_ug.type = ID_TYPE_NOT_SPECIFIED;
2684 unix_ug.id = -1;
2685 owner_type = WORLD_ACE;
2686 break;
2687 default:
2688 DEBUG(0,("canonicalise_acl: Unknown tagtype %u\n", (unsigned int)tagtype));
2689 continue;
2690 }
2691
2692 /*
2693 * Add this entry to the list.
2694 */
2695
2696 if ((ace = talloc(talloc_tos(), canon_ace)) == NULL)
2697 goto fail;
2698
2699 *ace = (canon_ace) {
2700 .type = tagtype,
2701 .perms = convert_permset_to_mode_t(permset),
2702 .attr = ALLOW_ACE,
2703 .trustee = sid,
2704 .unix_ug = unix_ug,
2705 .owner_type = owner_type
2706 };
2707 ace->ace_flags = get_pai_flags(pal, ace, is_default_acl);
2708
2709 DLIST_ADD(l_head, ace);
2710 }
2711
2712 /*
2713 * This next call will ensure we have at least a user/group/world set.
2714 */
2715
2716 if (!ensure_canon_entry_valid_on_get(conn, &l_head,
2717 powner, pgroup,
2718 psbuf))
2719 goto fail;
2720
2721 /*
2722 * Now go through the list, masking the permissions with the
2723 * acl_mask. Ensure all DENY Entries are at the start of the list.
2724 */
2725
2726 DEBUG(10,("canonicalise_acl: %s ace entries before arrange :\n", is_default_acl ? "Default" : "Access"));
2727
2728 for ( ace_count = 0, ace = l_head; ace; ace = next_ace, ace_count++) {
2729 next_ace = ace->next;
2730
2731 /* Masks are only applied to entries other than USER_OBJ and OTHER. */
2732 if (ace->type != SMB_ACL_OTHER && ace->type != SMB_ACL_USER_OBJ)
2733 ace->perms &= acl_mask;
2734
2735 if (ace->perms == 0) {
2736 DLIST_PROMOTE(l_head, ace);
2737 }
2738
2739 if( DEBUGLVL( 10 ) ) {
2740 print_canon_ace(ace, ace_count);
2741 }
2742 }
2743
2744 arrange_posix_perms(fname,&l_head );
2745
2746 print_canon_ace_list( "canonicalise_acl: ace entries after arrange", l_head );
2747
2748 return l_head;
2749
2750 fail:
2751
2752 free_canon_ace_list(l_head);
2753 return NULL;
2754 }
2755
2756 /****************************************************************************
2757 Check if the current user group list contains a given group.
2758 ****************************************************************************/
2759
2760 bool current_user_in_group(connection_struct *conn, gid_t gid)
2761 {
2762 uint32_t i;
2763 const struct security_unix_token *utok = get_current_utok(conn);
2764
2765 for (i = 0; i < utok->ngroups; i++) {
2766 if (utok->groups[i] == gid) {
2767 return True;
2768 }
2769 }
2770
2771 return False;
2772 }
2773
2774 /****************************************************************************
2775 Should we override a deny ? Check 'acl group control' and 'dos filemode'.
2776 ****************************************************************************/
2777
2778 static bool acl_group_override(connection_struct *conn,
2779 const struct smb_filename *smb_fname)
2780 {
2781 if ((errno != EPERM) && (errno != EACCES)) {
2782 return false;
2783 }
2784
2785 /* file primary group == user primary or supplementary group */
2786 if (lp_acl_group_control(SNUM(conn)) &&
2787 current_user_in_group(conn, smb_fname->st.st_ex_gid)) {
2788 return true;
2789 }
2790
2791 /* user has writeable permission */
2792 if (lp_dos_filemode(SNUM(conn)) &&
2793 can_write_to_file(conn, smb_fname)) {
2794 return true;
2795 }
2796
2797 return false;
2798 }
2799
2800 /****************************************************************************
2801 Attempt to apply an ACL to a file or directory.
2802 ****************************************************************************/
2803
2804 static bool set_canon_ace_list(files_struct *fsp,
2805 canon_ace *the_ace,
2806 bool default_ace,
2807 const SMB_STRUCT_STAT *psbuf,
2808 bool *pacl_set_support)
2809 {
2810 connection_struct *conn = fsp->conn;
2811 bool ret = False;
2812 SMB_ACL_T the_acl = sys_acl_init(talloc_tos());
2813 canon_ace *p_ace;
2814 int i;
2815 SMB_ACL_ENTRY_T mask_entry;
2816 bool got_mask_entry = False;
2817 SMB_ACL_PERMSET_T mask_permset;
2818 SMB_ACL_TYPE_T the_acl_type = (default_ace ? SMB_ACL_TYPE_DEFAULT : SMB_ACL_TYPE_ACCESS);
2819 bool needs_mask = False;
2820 mode_t mask_perms = 0;
2821
2822 /* Use the psbuf that was passed in. */
2823 if (psbuf != &fsp->fsp_name->st) {
2824 fsp->fsp_name->st = *psbuf;
2825 }
2826
2827 #if defined(POSIX_ACL_NEEDS_MASK)
2828 /* HP-UX always wants to have a mask (called "class" there). */
2829 needs_mask = True;
2830 #endif
2831
2832 if (the_acl == NULL) {
2833 DEBUG(0, ("sys_acl_init failed to allocate an ACL\n"));
2834 return false;
2835 }
2836
2837 if( DEBUGLVL( 10 )) {
2838 dbgtext("set_canon_ace_list: setting ACL:\n");
2839 for (i = 0, p_ace = the_ace; p_ace; p_ace = p_ace->next, i++ ) {
2840 print_canon_ace( p_ace, i);
2841 }
2842 }
2843
2844 for (i = 0, p_ace = the_ace; p_ace; p_ace = p_ace->next, i++ ) {
2845 SMB_ACL_ENTRY_T the_entry;
2846 SMB_ACL_PERMSET_T the_permset;
2847
2848 /*
2849 * ACLs only "need" an ACL_MASK entry if there are any named user or
2850 * named group entries. But if there is an ACL_MASK entry, it applies
2851 * to ACL_USER, ACL_GROUP, and ACL_GROUP_OBJ entries. Set the mask
2852 * so that it doesn't deny (i.e., mask off) any permissions.
2853 */
2854
2855 if (p_ace->type == SMB_ACL_USER || p_ace->type == SMB_ACL_GROUP) {
2856 needs_mask = True;
2857 mask_perms |= p_ace->perms;
2858 } else if (p_ace->type == SMB_ACL_GROUP_OBJ) {
2859 mask_perms |= p_ace->perms;
2860 }
2861
2862 /*
2863 * Get the entry for this ACE.
2864 */
2865
2866 if (sys_acl_create_entry(&the_acl, &the_entry) == -1) {
2867 DEBUG(0,("set_canon_ace_list: Failed to create entry %d. (%s)\n",
2868 i, strerror(errno) ));
2869 goto fail;
2870 }
2871
2872 if (p_ace->type == SMB_ACL_MASK) {
2873 mask_entry = the_entry;
2874 got_mask_entry = True;
2875 }
2876
2877 /*
2878 * Ok - we now know the ACL calls should be working, don't
2879 * allow fallback to chmod.
2880 */
2881
2882 *pacl_set_support = True;
2883
2884 /*
2885 * Initialise the entry from the canon_ace.
2886 */
2887
2888 /*
2889 * First tell the entry what type of ACE this is.
2890 */
2891
2892 if (sys_acl_set_tag_type(the_entry, p_ace->type) == -1) {
2893 DEBUG(0,("set_canon_ace_list: Failed to set tag type on entry %d. (%s)\n",
2894 i, strerror(errno) ));
2895 goto fail;
2896 }
2897
2898 /*
2899 * Only set the qualifier (user or group id) if the entry is a user
2900 * or group id ACE.
2901 */
2902
2903 if ((p_ace->type == SMB_ACL_USER) || (p_ace->type == SMB_ACL_GROUP)) {
2904 if (sys_acl_set_qualifier(the_entry,(void *)&p_ace->unix_ug.id) == -1) {
2905 DEBUG(0,("set_canon_ace_list: Failed to set qualifier on entry %d. (%s)\n",
2906 i, strerror(errno) ));
2907 goto fail;
2908 }
2909 }
2910
2911 /*
2912 * Convert the mode_t perms in the canon_ace to a POSIX permset.
2913 */
2914
2915 if (sys_acl_get_permset(the_entry, &the_permset) == -1) {
2916 DEBUG(0,("set_canon_ace_list: Failed to get permset on entry %d. (%s)\n",
2917 i, strerror(errno) ));
2918 goto fail;
2919 }
2920
2921 if (map_acl_perms_to_permset(conn, p_ace->perms, &the_permset) == -1) {
2922 DEBUG(0,("set_canon_ace_list: Failed to create permset for mode (%u) on entry %d. (%s)\n",
2923 (unsigned int)p_ace->perms, i, strerror(errno) ));
2924 goto fail;
2925 }
2926
2927 /*
2928 * ..and apply them to the entry.
2929 */
2930
2931 if (sys_acl_set_permset(the_entry, the_permset) == -1) {
2932 DEBUG(0,("set_canon_ace_list: Failed to add permset on entry %d. (%s)\n",
2933 i, strerror(errno) ));
2934 goto fail;
2935 }
2936
2937 if( DEBUGLVL( 10 ))
2938 print_canon_ace( p_ace, i);
2939
2940 }
2941
2942 if (needs_mask && !got_mask_entry) {
2943 if (sys_acl_create_entry(&the_acl, &mask_entry) == -1) {
2944 DEBUG(0,("set_canon_ace_list: Failed to create mask entry. (%s)\n", strerror(errno) ));
2945 goto fail;
2946 }
2947
2948 if (sys_acl_set_tag_type(mask_entry, SMB_ACL_MASK) == -1) {
2949 DEBUG(0,("set_canon_ace_list: Failed to set tag type on mask entry. (%s)\n",strerror(errno) ));
2950 goto fail;
2951 }
2952
2953 if (sys_acl_get_permset(mask_entry, &mask_permset) == -1) {
2954 DEBUG(0,("set_canon_ace_list: Failed to get mask permset. (%s)\n", strerror(errno) ));
2955 goto fail;
2956 }
2957
2958 if (map_acl_perms_to_permset(conn, S_IRUSR|S_IWUSR|S_IXUSR, &mask_permset) == -1) {
2959 DEBUG(0,("set_canon_ace_list: Failed to create mask permset. (%s)\n", strerror(errno) ));
2960 goto fail;
2961 }
2962
2963 if (sys_acl_set_permset(mask_entry, mask_permset) == -1) {
2964 DEBUG(0,("set_canon_ace_list: Failed to add mask permset. (%s)\n", strerror(errno) ));
2965 goto fail;
2966 }
2967 }
2968
2969 /*
2970 * Finally apply it to the file or directory.
2971 */
2972
2973 if(default_ace || fsp->is_directory || fsp->fh->fd == -1) {
2974 if (SMB_VFS_SYS_ACL_SET_FILE(conn, fsp->fsp_name,
2975 the_acl_type, the_acl) == -1) {
2976 /*
2977 * Some systems allow all the above calls and only fail with no ACL support
2978 * when attempting to apply the acl. HPUX with HFS is an example of this. JRA.
2979 */
2980 if (no_acl_syscall_error(errno)) {
2981 *pacl_set_support = False;
2982 }
2983
2984 if (acl_group_override(conn, fsp->fsp_name)) {
2985 int sret;
2986
2987 DEBUG(5,("set_canon_ace_list: acl group "
2988 "control on and current user in file "
2989 "%s primary group.\n",
2990 fsp_str_dbg(fsp)));
2991
2992 become_root();
2993 sret = SMB_VFS_SYS_ACL_SET_FILE(conn,
2994 fsp->fsp_name, the_acl_type,
2995 the_acl);
2996 unbecome_root();
2997 if (sret == 0) {
2998 ret = True;
2999 }
3000 }
3001
3002 if (ret == False) {
3003 DEBUG(2,("set_canon_ace_list: "
3004 "sys_acl_set_file type %s failed for "
3005 "file %s (%s).\n",
3006 the_acl_type == SMB_ACL_TYPE_DEFAULT ?
3007 "directory default" : "file",
3008 fsp_str_dbg(fsp), strerror(errno)));
3009 goto fail;
3010 }
3011 }
3012 } else {
3013 if (SMB_VFS_SYS_ACL_SET_FD(fsp, the_acl) == -1) {
3014 /*
3015 * Some systems allow all the above calls and only fail with no ACL support
3016 * when attempting to apply the acl. HPUX with HFS is an example of this. JRA.
3017 */
3018 if (no_acl_syscall_error(errno)) {
3019 *pacl_set_support = False;
3020 }
3021
3022 if (acl_group_override(conn, fsp->fsp_name)) {
3023 int sret;
3024
3025 DEBUG(5,("set_canon_ace_list: acl group "
3026 "control on and current user in file "
3027 "%s primary group.\n",
3028 fsp_str_dbg(fsp)));
3029
3030 become_root();
3031 sret = SMB_VFS_SYS_ACL_SET_FD(fsp, the_acl);
3032 unbecome_root();
3033 if (sret == 0) {
3034 ret = True;
3035 }
3036 }
3037
3038 if (ret == False) {
3039 DEBUG(2,("set_canon_ace_list: "
3040 "sys_acl_set_file failed for file %s "
3041 "(%s).\n",
3042 fsp_str_dbg(fsp), strerror(errno)));
3043 goto fail;
3044 }
3045 }
3046 }
3047
3048 ret = True;
3049
3050 fail:
3051
3052 if (the_acl != NULL) {
3053 TALLOC_FREE(the_acl);
3054 }
3055
3056 return ret;
3057 }
3058
3059 /****************************************************************************
3060
3061 ****************************************************************************/
3062
3063 SMB_ACL_T free_empty_sys_acl(connection_struct *conn, SMB_ACL_T the_acl)
3064 {
3065 SMB_ACL_ENTRY_T entry;
3066
3067 if (!the_acl)
3068 return NULL;
3069 if (sys_acl_get_entry(the_acl, SMB_ACL_FIRST_ENTRY, &entry) != 1) {
3070 TALLOC_FREE(the_acl);
3071 return NULL;
3072 }
3073 return the_acl;
3074 }
3075
3076 /****************************************************************************
3077 Convert a canon_ace to a generic 3 element permission - if possible.
3078 ****************************************************************************/
3079
3080 #define MAP_PERM(p,mask,result) (((p) & (mask)) ? (result) : 0 )
3081
3082 static bool convert_canon_ace_to_posix_perms( files_struct *fsp, canon_ace *file_ace_list, mode_t *posix_perms)
3083 {
3084 size_t ace_count = count_canon_ace_list(file_ace_list);
3085 canon_ace *ace_p;
3086 canon_ace *owner_ace = NULL;
3087 canon_ace *group_ace = NULL;
3088 canon_ace *other_ace = NULL;
3089
3090 if (ace_count > 5) {
3091 DEBUG(3,("convert_canon_ace_to_posix_perms: Too many ACE "
3092 "entries for file %s to convert to posix perms.\n",
3093 fsp_str_dbg(fsp)));
3094 return False;
3095 }
3096
3097 for (ace_p = file_ace_list; ace_p; ace_p = ace_p->next) {
3098 if (ace_p->owner_type == UID_ACE)
3099 owner_ace = ace_p;
3100 else if (ace_p->owner_type == GID_ACE)
3101 group_ace = ace_p;
3102 else if (ace_p->owner_type == WORLD_ACE)
3103 other_ace = ace_p;
3104 }
3105
3106 if (!owner_ace || !group_ace || !other_ace) {
3107 DEBUG(3,("convert_canon_ace_to_posix_perms: Can't get "
3108 "standard entries for file %s.\n", fsp_str_dbg(fsp)));
3109 return False;
3110 }
3111
3112 /*
3113 * Ensure all ACE entries are owner, group or other.
3114 * We can't set if there are any other SIDs.
3115 */
3116 for (ace_p = file_ace_list; ace_p; ace_p = ace_p->next) {
3117 if (ace_p == owner_ace || ace_p == group_ace ||
3118 ace_p == other_ace) {
3119 continue;
3120 }
3121 if (ace_p->owner_type == UID_ACE) {
3122 if (ace_p->unix_ug.id != owner_ace->unix_ug.id) {
3123 DEBUG(3,("Invalid uid %u in ACE for file %s.\n",
3124 (unsigned int)ace_p->unix_ug.id,
3125 fsp_str_dbg(fsp)));
3126 return false;
3127 }
3128 } else if (ace_p->owner_type == GID_ACE) {
3129 if (ace_p->unix_ug.id != group_ace->unix_ug.id) {
3130 DEBUG(3,("Invalid gid %u in ACE for file %s.\n",
3131 (unsigned int)ace_p->unix_ug.id,
3132 fsp_str_dbg(fsp)));
3133 return false;
3134 }
3135 } else {
3136 /*
3137 * There should be no duplicate WORLD_ACE entries.
3138 */
3139
3140 DEBUG(3,("Invalid type %u, uid %u in "
3141 "ACE for file %s.\n",
3142 (unsigned int)ace_p->owner_type,
3143 (unsigned int)ace_p->unix_ug.id,
3144 fsp_str_dbg(fsp)));
3145 return false;
3146 }
3147 }
3148
3149 *posix_perms = (mode_t)0;
3150
3151 *posix_perms |= owner_ace->perms;
3152 *posix_perms |= MAP_PERM(group_ace->perms, S_IRUSR, S_IRGRP);
3153 *posix_perms |= MAP_PERM(group_ace->perms, S_IWUSR, S_IWGRP);
3154 *posix_perms |= MAP_PERM(group_ace->perms, S_IXUSR, S_IXGRP);
3155 *posix_perms |= MAP_PERM(other_ace->perms, S_IRUSR, S_IROTH);
3156 *posix_perms |= MAP_PERM(other_ace->perms, S_IWUSR, S_IWOTH);
3157 *posix_perms |= MAP_PERM(other_ace->perms, S_IXUSR, S_IXOTH);
3158
3159 /* The owner must have at least read access. */
3160
3161 *posix_perms |= S_IRUSR;
3162 if (fsp->is_directory)
3163 *posix_perms |= (S_IWUSR|S_IXUSR);
3164
3165 DEBUG(10,("convert_canon_ace_to_posix_perms: converted u=%o,g=%o,w=%o "
3166 "to perm=0%o for file %s.\n", (int)owner_ace->perms,
3167 (int)group_ace->perms, (int)other_ace->perms,
3168 (int)*posix_perms, fsp_str_dbg(fsp)));
3169
3170 return True;
3171 }
3172
3173 /****************************************************************************
3174 Incoming NT ACLs on a directory can be split into a default POSIX acl (CI|OI|IO) and
3175 a normal POSIX acl. Win2k needs these split acls re-merging into one ACL
3176 with CI|OI set so it is inherited and also applies to the directory.
3177 Based on code from "Jim McDonough" <jmcd@us.ibm.com>.
3178 ****************************************************************************/
3179
3180 static size_t merge_default_aces( struct security_ace *nt_ace_list, size_t num_aces)
3181 {
3182 size_t i, j;
3183
3184 for (i = 0; i < num_aces; i++) {
3185 for (j = i+1; j < num_aces; j++) {
3186 uint32_t i_flags_ni = (nt_ace_list[i].flags & ~SEC_ACE_FLAG_INHERITED_ACE);
3187 uint32_t j_flags_ni = (nt_ace_list[j].flags & ~SEC_ACE_FLAG_INHERITED_ACE);
3188 bool i_inh = (nt_ace_list[i].flags & SEC_ACE_FLAG_INHERITED_ACE) ? True : False;
3189 bool j_inh = (nt_ace_list[j].flags & SEC_ACE_FLAG_INHERITED_ACE) ? True : False;
3190
3191 /* We know the lower number ACE's are file entries. */
3192 if ((nt_ace_list[i].type == nt_ace_list[j].type) &&
3193 (nt_ace_list[i].size == nt_ace_list[j].size) &&
3194 (nt_ace_list[i].access_mask == nt_ace_list[j].access_mask) &&
3195 dom_sid_equal(&nt_ace_list[i].trustee, &nt_ace_list[j].trustee) &&
3196 (i_inh == j_inh) &&
3197 (i_flags_ni == 0) &&
3198 (j_flags_ni == (SEC_ACE_FLAG_OBJECT_INHERIT|
3199 SEC_ACE_FLAG_CONTAINER_INHERIT|
3200 SEC_ACE_FLAG_INHERIT_ONLY))) {
3201 /*
3202 * W2K wants to have access allowed zero access ACE's
3203 * at the end of the list. If the mask is zero, merge
3204 * the non-inherited ACE onto the inherited ACE.
3205 */
3206
3207 if (nt_ace_list[i].access_mask == 0) {
3208 nt_ace_list[j].flags = SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT|
3209 (i_inh ? SEC_ACE_FLAG_INHERITED_ACE : 0);
3210 if (num_aces - i - 1 > 0)
3211 memmove(&nt_ace_list[i], &nt_ace_list[i+1], (num_aces-i-1) *
3212 sizeof(struct security_ace));
3213
3214 DEBUG(10,("merge_default_aces: Merging zero access ACE %u onto ACE %u.\n",
3215 (unsigned int)i, (unsigned int)j ));
3216 } else {
3217 /*
3218 * These are identical except for the flags.
3219 * Merge the inherited ACE onto the non-inherited ACE.
3220 */
3221
3222 nt_ace_list[i].flags = SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT|
3223 (i_inh ? SEC_ACE_FLAG_INHERITED_ACE : 0);
3224 if (num_aces - j - 1 > 0)
3225 memmove(&nt_ace_list[j], &nt_ace_list[j+1], (num_aces-j-1) *
3226 sizeof(struct security_ace));
3227
3228 DEBUG(10,("merge_default_aces: Merging ACE %u onto ACE %u.\n",
3229 (unsigned int)j, (unsigned int)i ));
3230 }
3231 num_aces--;
3232 break;
3233 }
3234 }
3235 }
3236
3237 return num_aces;
3238 }
3239
3240 /*
3241 * Add or Replace ACE entry.
3242 * In some cases we need to add a specific ACE for compatibility reasons.
3243 * When doing that we must make sure we are not actually creating a duplicate
3244 * entry. So we need to search whether an ACE entry already exist and eventually
3245 * replacce the access mask, or add a completely new entry if none was found.
3246 *
3247 * This function assumes the array has enough space to add a new entry without
3248 * any reallocation of memory.
3249 */
3250
3251 static void add_or_replace_ace(struct security_ace *nt_ace_list, size_t *num_aces,
3252 const struct dom_sid *sid, enum security_ace_type type,
3253 uint32_t mask, uint8_t flags)
3254 {
3255 size_t i;
3256
3257 /* first search for a duplicate */
3258 for (i = 0; i < *num_aces; i++) {
3259 if (dom_sid_equal(&nt_ace_list[i].trustee, sid) &&
3260 (nt_ace_list[i].flags == flags)) break;
3261 }
3262
3263 if (i < *num_aces) { /* found */
3264 nt_ace_list[i].type = type;
3265 nt_ace_list[i].access_mask = mask;
3266 DEBUG(10, ("Replacing ACE %zu with SID %s and flags %02x\n",
3267 i, sid_string_dbg(sid), flags));
3268 return;
3269 }
3270
3271 /* not found, append it */
3272 init_sec_ace(&nt_ace_list[(*num_aces)++], sid, type, mask, flags);
3273 }
3274
3275
3276 /****************************************************************************
3277 Reply to query a security descriptor from an fsp. If it succeeds it allocates
3278 the space for the return elements and returns the size needed to return the
3279 security descriptor. This should be the only external function needed for
3280 the UNIX style get ACL.
3281 ****************************************************************************/
3282
3283 static NTSTATUS posix_get_nt_acl_common(struct connection_struct *conn,
3284 const char *name,
3285 const SMB_STRUCT_STAT *sbuf,
3286 struct pai_val *pal,
3287 SMB_ACL_T posix_acl,
3288 SMB_ACL_T def_acl,
3289 uint32_t security_info,
3290 TALLOC_CTX *mem_ctx,
3291 struct security_descriptor **ppdesc)
3292 {
3293 struct dom_sid owner_sid;
3294 struct dom_sid group_sid;
3295 size_t sd_size = 0;
3296 struct security_acl *psa = NULL;
3297 size_t num_acls = 0;
3298 size_t num_def_acls = 0;
3299 size_t num_aces = 0;
3300 canon_ace *file_ace = NULL;
3301 canon_ace *dir_ace = NULL;
3302 struct security_ace *nt_ace_list = NULL;
3303 size_t num_profile_acls = 0;
3304 struct dom_sid orig_owner_sid;
3305 struct security_descriptor *psd = NULL;
3306
3307 /*
3308 * Get the owner, group and world SIDs.
3309 */
3310
3311 create_file_sids(sbuf, &owner_sid, &group_sid);
3312
3313 if (lp_profile_acls(SNUM(conn))) {
3314 /* For WXP SP1 the owner must be administrators. */
3315 sid_copy(&orig_owner_sid, &owner_sid);
3316 sid_copy(&owner_sid, &global_sid_Builtin_Administrators);
3317 sid_copy(&group_sid, &global_sid_Builtin_Users);
3318 num_profile_acls = 3;
3319 }
3320
3321 if (security_info & SECINFO_DACL) {
3322
3323 /*
3324 * In the optimum case Creator Owner and Creator Group would be used for
3325 * the ACL_USER_OBJ and ACL_GROUP_OBJ entries, respectively, but this
3326 * would lead to usability problems under Windows: The Creator entries
3327 * are only available in browse lists of directories and not for files;
3328 * additionally the identity of the owning group couldn't be determined.
3329 * We therefore use those identities only for Default ACLs.
3330 */
3331
3332 /* Create the canon_ace lists. */
3333 file_ace = canonicalise_acl(conn, name, posix_acl, sbuf,
3334 &owner_sid, &group_sid, pal,
3335 SMB_ACL_TYPE_ACCESS);
3336
3337 /* We must have *some* ACLS. */
3338
3339 if (count_canon_ace_list(file_ace) == 0) {
3340 DEBUG(0,("get_nt_acl : No ACLs on file (%s) !\n", name));
3341 goto done;
3342 }
3343
3344 if (S_ISDIR(sbuf->st_ex_mode) && def_acl) {
3345 dir_ace = canonicalise_acl(conn, name, def_acl,
3346 sbuf,
3347 &global_sid_Creator_Owner,
3348 &global_sid_Creator_Group,
3349 pal, SMB_ACL_TYPE_DEFAULT);
3350 }
3351
3352 /*
3353 * Create the NT ACE list from the canonical ace lists.
3354 */
3355
3356 {
3357 canon_ace *ace;
3358 enum security_ace_type nt_acl_type;
3359
3360 num_acls = count_canon_ace_list(file_ace);
3361 num_def_acls = count_canon_ace_list(dir_ace);
3362
3363 nt_ace_list = talloc_zero_array(
3364 talloc_tos(), struct security_ace,
3365 num_acls + num_profile_acls + num_def_acls);
3366
3367 if (nt_ace_list == NULL) {
3368 DEBUG(0,("get_nt_acl: Unable to malloc space for nt_ace_list.\n"));
3369 goto done;
3370 }
3371
3372 /*
3373 * Create the NT ACE list from the canonical ace lists.
3374 */
3375
3376 for (ace = file_ace; ace != NULL; ace = ace->next) {
3377 uint32_t acc = map_canon_ace_perms(SNUM(conn),
3378 &nt_acl_type,
3379 ace->perms,
3380 S_ISDIR(sbuf->st_ex_mode));
3381 init_sec_ace(&nt_ace_list[num_aces++],
3382 &ace->trustee,
3383 nt_acl_type,
3384 acc,
3385 ace->ace_flags);
3386 }
3387
3388 /* The User must have access to a profile share - even
3389 * if we can't map the SID. */
3390 if (lp_profile_acls(SNUM(conn))) {
3391 add_or_replace_ace(nt_ace_list, &num_aces,
3392 &global_sid_Builtin_Users,
3393 SEC_ACE_TYPE_ACCESS_ALLOWED,
3394 FILE_GENERIC_ALL, 0);
3395 }
3396
3397 for (ace = dir_ace; ace != NULL; ace = ace->next) {
3398 uint32_t acc = map_canon_ace_perms(SNUM(conn),
3399 &nt_acl_type,
3400 ace->perms,
3401 S_ISDIR(sbuf->st_ex_mode));
3402 init_sec_ace(&nt_ace_list[num_aces++],
3403 &ace->trustee,
3404 nt_acl_type,
3405 acc,
3406 ace->ace_flags |
3407 SEC_ACE_FLAG_OBJECT_INHERIT|
3408 SEC_ACE_FLAG_CONTAINER_INHERIT|
3409 SEC_ACE_FLAG_INHERIT_ONLY);
3410 }
3411
3412 /* The User must have access to a profile share - even
3413 * if we can't map the SID. */
3414 if (lp_profile_acls(SNUM(conn))) {
3415 add_or_replace_ace(nt_ace_list, &num_aces,
3416 &global_sid_Builtin_Users,
3417 SEC_ACE_TYPE_ACCESS_ALLOWED,
3418 FILE_GENERIC_ALL,
3419 SEC_ACE_FLAG_OBJECT_INHERIT |
3420 SEC_ACE_FLAG_CONTAINER_INHERIT |
3421 SEC_ACE_FLAG_INHERIT_ONLY);
3422 }
3423
3424 /*
3425 * Merge POSIX default ACLs and normal ACLs into one NT ACE.
3426 * Win2K needs this to get the inheritance correct when replacing ACLs
3427 * on a directory tree. Based on work by Jim @ IBM.
3428 */
3429
3430 num_aces = merge_default_aces(nt_ace_list, num_aces);
3431
3432 if (lp_profile_acls(SNUM(conn))) {
3433 size_t i;
3434
3435 for (i = 0; i < num_aces; i++) {
3436 if (dom_sid_equal(&nt_ace_list[i].trustee, &owner_sid)) {
3437 add_or_replace_ace(nt_ace_list, &num_aces,
3438 &orig_owner_sid,
3439 nt_ace_list[i].type,
3440 nt_ace_list[i].access_mask,
3441 nt_ace_list[i].flags);
3442 break;
3443 }
3444 }
3445 }
3446 }
3447
3448 if (num_aces) {
3449 if((psa = make_sec_acl( talloc_tos(), NT4_ACL_REVISION, num_aces, nt_ace_list)) == NULL) {
3450 DEBUG(0,("get_nt_acl: Unable to malloc space for acl.\n"));
3451 goto done;
3452 }
3453 }
3454 } /* security_info & SECINFO_DACL */
3455
3456 psd = make_standard_sec_desc(mem_ctx,
3457 (security_info & SECINFO_OWNER) ? &owner_sid : NULL,
3458 (security_info & SECINFO_GROUP) ? &group_sid : NULL,
3459 psa,
3460 &sd_size);
3461
3462 if(!psd) {
3463 DEBUG(0,("get_nt_acl: Unable to malloc space for security descriptor.\n"));
3464 sd_size = 0;
3465 goto done;
3466 }
3467
3468 /*
3469 * Windows 2000: The DACL_PROTECTED flag in the security
3470 * descriptor marks the ACL as non-inheriting, i.e., no
3471 * ACEs from higher level directories propagate to this
3472 * ACL. In the POSIX ACL model permissions are only
3473 * inherited at file create time, so ACLs never contain
3474 * any ACEs that are inherited dynamically. The DACL_PROTECTED
3475 * flag doesn't seem to bother Windows NT.
3476 * Always set this if map acl inherit is turned off.
3477 */
3478 if (pal == NULL || !lp_map_acl_inherit(SNUM(conn))) {
3479 psd->type |= SEC_DESC_DACL_PROTECTED;
3480 } else {
3481 psd->type |= pal->sd_type;
3482 }
3483
3484 if (psd->dacl) {
3485 dacl_sort_into_canonical_order(psd->dacl->aces, (unsigned int)psd->dacl->num_aces);
3486 }
3487
3488 *ppdesc = psd;
3489
3490 done:
3491
3492 if (posix_acl) {
3493 TALLOC_FREE(posix_acl);
3494 }
3495 if (def_acl) {
3496 TALLOC_FREE(def_acl);
3497 }
3498 free_canon_ace_list(file_ace);
3499 free_canon_ace_list(dir_ace);
3500 free_inherited_info(pal);
3501 TALLOC_FREE(nt_ace_list);
3502
3503 return NT_STATUS_OK;
3504 }
3505
3506 NTSTATUS posix_fget_nt_acl(struct files_struct *fsp, uint32_t security_info,
3507 TALLOC_CTX *mem_ctx,
3508 struct security_descriptor **ppdesc)
3509 {
3510 SMB_STRUCT_STAT sbuf;
3511 SMB_ACL_T posix_acl = NULL;
3512 struct pai_val *pal;
3513 TALLOC_CTX *frame = talloc_stackframe();
3514 NTSTATUS status;
3515
3516 *ppdesc = NULL;
3517
3518 DEBUG(10,("posix_fget_nt_acl: called for file %s\n",
3519 fsp_str_dbg(fsp)));
3520
3521 /* can it happen that fsp_name == NULL ? */
3522 if (fsp->is_directory || fsp->fh->fd == -1) {
3523 status = posix_get_nt_acl(fsp->conn, fsp->fsp_name,
3524 security_info, mem_ctx, ppdesc);
3525 TALLOC_FREE(frame);
3526 return status;
3527 }
3528
3529 /* Get the stat struct for the owner info. */
3530 if(SMB_VFS_FSTAT(fsp, &sbuf) != 0) {
3531 TALLOC_FREE(frame);
3532 return map_nt_error_from_unix(errno);
3533 }
3534
3535 /* Get the ACL from the fd. */
3536 posix_acl = SMB_VFS_SYS_ACL_GET_FD(fsp, frame);
3537
3538 pal = fload_inherited_info(fsp);
3539
3540 status = posix_get_nt_acl_common(fsp->conn, fsp->fsp_name->base_name,
3541 &sbuf, pal, posix_acl, NULL,
3542 security_info, mem_ctx, ppdesc);
3543 TALLOC_FREE(frame);
3544 return status;
3545 }
3546
3547 NTSTATUS posix_get_nt_acl(struct connection_struct *conn,
3548 const struct smb_filename *smb_fname_in,
3549 uint32_t security_info,
3550 TALLOC_CTX *mem_ctx,
3551 struct security_descriptor **ppdesc)
3552 {
3553 SMB_ACL_T posix_acl = NULL;
3554 SMB_ACL_T def_acl = NULL;
3555 struct pai_val *pal;
3556 struct smb_filename *smb_fname = NULL;
3557 int ret;
3558 TALLOC_CTX *frame = talloc_stackframe();
3559 NTSTATUS status;
3560
3561 *ppdesc = NULL;
3562
3563 DEBUG(10,("posix_get_nt_acl: called for file %s\n",
3564 smb_fname_in->base_name ));
3565
3566 smb_fname = cp_smb_filename(talloc_tos(), smb_fname_in);
3567 if (smb_fname == NULL) {
3568 TALLOC_FREE(frame);
3569 return NT_STATUS_NO_MEMORY;
3570 }
3571
3572 /* Get the stat struct for the owner info. */
3573 /*
3574 * We can directly use SMB_VFS_STAT here, as if this was a
3575 * POSIX call on a symlink, we've already refused it.
3576 * For a Windows acl mapped call on a symlink, we want to follow
3577 * it.
3578 */
3579 ret = SMB_VFS_STAT(conn, smb_fname);
3580
3581 if (ret == -1) {
3582 TALLOC_FREE(frame);
3583 return map_nt_error_from_unix(errno);
3584 }
3585
3586 /* Get the ACL from the path. */
3587 posix_acl = SMB_VFS_SYS_ACL_GET_FILE(conn, smb_fname,
3588 SMB_ACL_TYPE_ACCESS, frame);
3589
3590 /* If it's a directory get the default POSIX ACL. */
3591 if(S_ISDIR(smb_fname->st.st_ex_mode)) {
3592 def_acl = SMB_VFS_SYS_ACL_GET_FILE(conn, smb_fname,
3593 SMB_ACL_TYPE_DEFAULT, frame);
3594 def_acl = free_empty_sys_acl(conn, def_acl);
3595 }
3596
3597 pal = load_inherited_info(conn, smb_fname);
3598
3599 status = posix_get_nt_acl_common(conn,
3600 smb_fname->base_name,
3601 &smb_fname->st,
3602 pal,
3603 posix_acl,
3604 def_acl,
3605 security_info,
3606 mem_ctx,
3607 ppdesc);
3608 TALLOC_FREE(frame);
3609 return status;
3610 }
3611
3612 /****************************************************************************
3613 Try to chown a file. We will be able to chown it under the following conditions.
3614
3615 1) If we have root privileges, then it will just work.
3616 2) If we have SeRestorePrivilege we can change the user + group to any other user.
3617 3) If we have SeTakeOwnershipPrivilege we can change the user to the current user.
3618 4) If we have write permission to the file and dos_filemodes is set
3619 then allow chown to the currently authenticated user.
3620 ****************************************************************************/
3621
3622 NTSTATUS try_chown(files_struct *fsp, uid_t uid, gid_t gid)
3623 {
3624 NTSTATUS status;
3625
3626 if(!CAN_WRITE(fsp->conn)) {
3627 return NT_STATUS_MEDIA_WRITE_PROTECTED;
3628 }
3629
3630 /* Case (1). */
3631 status = vfs_chown_fsp(fsp, uid, gid);
3632 if (NT_STATUS_IS_OK(status)) {
3633 return status;
3634 }
3635
3636 /* Case (2) / (3) */
3637 if (lp_enable_privileges()) {
3638 bool has_take_ownership_priv = security_token_has_privilege(
3639 get_current_nttok(fsp->conn),
3640 SEC_PRIV_TAKE_OWNERSHIP);
3641 bool has_restore_priv = security_token_has_privilege(
3642 get_current_nttok(fsp->conn),
3643 SEC_PRIV_RESTORE);
3644
3645 if (has_restore_priv) {
3646 ; /* Case (2) */
3647 } else if (has_take_ownership_priv) {
3648 /* Case (3) */
3649 if (uid == get_current_uid(fsp->conn)) {
3650 gid = (gid_t)-1;
3651 } else {
3652 has_take_ownership_priv = false;
3653 }
3654 }
3655
3656 if (has_take_ownership_priv || has_restore_priv) {
3657 become_root();
3658 status = vfs_chown_fsp(fsp, uid, gid);
3659 unbecome_root();
3660 return status;
3661 }
3662 }
3663
3664 /* Case (4). */
3665 if (!lp_dos_filemode(SNUM(fsp->conn))) {
3666 return NT_STATUS_ACCESS_DENIED;
3667 }
3668
3669 /* only allow chown to the current user. This is more secure,
3670 and also copes with the case where the SID in a take ownership ACL is
3671 a local SID on the users workstation
3672 */
3673 if (uid != get_current_uid(fsp->conn)) {
3674 return NT_STATUS_ACCESS_DENIED;
3675 }
3676
3677 become_root();
3678 /* Keep the current file gid the same. */
3679 status = vfs_chown_fsp(fsp, uid, (gid_t)-1);
3680 unbecome_root();
3681
3682 return status;
3683 }
3684
3685 /****************************************************************************
3686 Reply to set a security descriptor on an fsp. security_info_sent is the
3687 description of the following NT ACL.
3688 This should be the only external function needed for the UNIX style set ACL.
3689 We make a copy of psd_orig as internal functions modify the elements inside
3690 it, even though it's a const pointer.
3691 ****************************************************************************/
3692
3693 NTSTATUS set_nt_acl(files_struct *fsp, uint32_t security_info_sent, const struct security_descriptor *psd_orig)
3694 {
3695 connection_struct *conn = fsp->conn;
3696 uid_t user = (uid_t)-1;
3697 gid_t grp = (gid_t)-1;
3698 struct dom_sid file_owner_sid;
3699 struct dom_sid file_grp_sid;
3700 canon_ace *file_ace_list = NULL;
3701 canon_ace *dir_ace_list = NULL;
3702 bool acl_perms = False;
3703 mode_t orig_mode = (mode_t)0;
3704 NTSTATUS status;
3705 bool set_acl_as_root = false;
3706 bool acl_set_support = false;
3707 bool ret = false;
3708 struct security_descriptor *psd = NULL;
3709
3710 DEBUG(10,("set_nt_acl: called for file %s\n",
3711 fsp_str_dbg(fsp)));
3712
3713 if (!CAN_WRITE(conn)) {
3714 DEBUG(10,("set acl rejected on read-only share\n"));
3715 return NT_STATUS_MEDIA_WRITE_PROTECTED;
3716 }
3717
3718 if (psd_orig == NULL) {
3719 return NT_STATUS_INVALID_PARAMETER;
3720 }
3721
3722 /*
3723 * MS NFS mode, here's the deal: the client merely wants to
3724 * modify the mode, but roundtripping get_acl/set/acl would
3725 * add additional POSIX ACEs. So in case we get a request
3726 * containing a MS NFS mode SID, we do nothing here.
3727 */
3728 if (security_descriptor_with_ms_nfs(psd_orig)) {
3729 return NT_STATUS_OK;
3730 }
3731
3732 psd = security_descriptor_copy(talloc_tos(), psd_orig);
3733 if (psd == NULL) {
3734 return NT_STATUS_NO_MEMORY;
3735 }
3736
3737 /*
3738 * Get the current state of the file.
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 /*
3750 * Unpack the user/group/world id's.
3751 */
3752
3753 /* POSIX can't cope with missing owner/group. */
3754 if ((security_info_sent & SECINFO_OWNER) && (psd->owner_sid == NULL)) {
3755 security_info_sent &= ~SECINFO_OWNER;
3756 }
3757 if ((security_info_sent & SECINFO_GROUP) && (psd->group_sid == NULL)) {
3758 security_info_sent &= ~SECINFO_GROUP;
3759 }
3760
3761 /* If UNIX owner is inherited and Windows isn't, then
3762 * setting the UNIX owner based on Windows owner conflicts
3763 * with the inheritance rule
3764 */
3765 if (lp_inherit_owner(SNUM(conn)) == INHERIT_OWNER_UNIX_ONLY) {
3766 security_info_sent &= ~SECINFO_OWNER;
3767 }
3768
3769 status = unpack_nt_owners( conn, &user, &grp, security_info_sent, psd);
3770 if (!NT_STATUS_IS_OK(status)) {
3771 return status;
3772 }
3773
3774 /*
3775 * Do we need to chown ? If so this must be done first as the incoming
3776 * CREATOR_OWNER acl will be relative to the *new* owner, not the old.
3777 * Noticed by Simo.
3778 */
3779
3780 if (((user != (uid_t)-1) && (fsp->fsp_name->st.st_ex_uid != user)) ||
3781 (( grp != (gid_t)-1) && (fsp->fsp_name->st.st_ex_gid != grp))) {
3782
3783 DEBUG(3,("set_nt_acl: chown %s. uid = %u, gid = %u.\n",
3784 fsp_str_dbg(fsp), (unsigned int)user,
3785 (unsigned int)grp));
3786
3787 status = try_chown(fsp, user, grp);
3788 if(!NT_STATUS_IS_OK(status)) {
3789 DEBUG(3,("set_nt_acl: chown %s, %u, %u failed. Error "
3790 "= %s.\n", fsp_str_dbg(fsp),
3791 (unsigned int)user,
3792 (unsigned int)grp,
3793 nt_errstr(status)));
3794 return status;
3795 }
3796
3797 /*
3798 * Recheck the current state of the file, which may have changed.
3799 * (suid/sgid bits, for instance)
3800 */
3801
3802 status = vfs_stat_fsp(fsp);
3803 if (!NT_STATUS_IS_OK(status)) {
3804 return status;
3805 }
3806
3807 /* Save the original element we check against. */
3808 orig_mode = fsp->fsp_name->st.st_ex_mode;
3809
3810 /* If we successfully chowned, we know we must
3811 * be able to set the acl, so do it as root.
3812 */
3813 set_acl_as_root = true;
3814 }
3815
3816 create_file_sids(&fsp->fsp_name->st, &file_owner_sid, &file_grp_sid);
3817
3818 if((security_info_sent & SECINFO_DACL) &&
3819 (psd->type & SEC_DESC_DACL_PRESENT) &&
3820 (psd->dacl == NULL)) {
3821 struct security_ace ace[3];
3822
3823 /* We can't have NULL DACL in POSIX.
3824 Use owner/group/Everyone -> full access. */
3825
3826 init_sec_ace(&ace[0],
3827 &file_owner_sid,
3828 SEC_ACE_TYPE_ACCESS_ALLOWED,
3829 GENERIC_ALL_ACCESS,
3830 0);
3831 init_sec_ace(&ace[1],
3832 &file_grp_sid,
3833 SEC_ACE_TYPE_ACCESS_ALLOWED,
3834 GENERIC_ALL_ACCESS,
3835 0);
3836 init_sec_ace(&ace[2],
3837 &global_sid_World,
3838 SEC_ACE_TYPE_ACCESS_ALLOWED,
3839 GENERIC_ALL_ACCESS,
3840 0);
3841 psd->dacl = make_sec_acl(talloc_tos(),
3842 NT4_ACL_REVISION,
3843 3,
3844 ace);
3845 if (psd->dacl == NULL) {
3846 return NT_STATUS_NO_MEMORY;
3847 }
3848 security_acl_map_generic(psd->dacl, &file_generic_mapping);
3849 }
3850
3851 acl_perms = unpack_canon_ace(fsp, &fsp->fsp_name->st, &file_owner_sid,
3852 &file_grp_sid, &file_ace_list,
3853 &dir_ace_list, security_info_sent, psd);
3854
3855 /* Ignore W2K traverse DACL set. */
3856 if (!file_ace_list && !dir_ace_list) {
3857 return NT_STATUS_OK;
3858 }
3859
3860 if (!acl_perms) {
3861 DEBUG(3,("set_nt_acl: cannot set permissions\n"));
3862 free_canon_ace_list(file_ace_list);
3863 free_canon_ace_list(dir_ace_list);
3864 return NT_STATUS_ACCESS_DENIED;
3865 }
3866
3867 /*
3868 * Only change security if we got a DACL.
3869 */
3870
3871 if(!(security_info_sent & SECINFO_DACL) || (psd->dacl == NULL)) {
3872 free_canon_ace_list(file_ace_list);
3873 free_canon_ace_list(dir_ace_list);
3874 return NT_STATUS_OK;
3875 }
3876
3877 /*
3878 * Try using the POSIX ACL set first. Fall back to chmod if
3879 * we have no ACL support on this filesystem.
3880 */
3881
3882 if (acl_perms && file_ace_list) {
3883 if (set_acl_as_root) {
3884 become_root();
3885 }
3886 ret = set_canon_ace_list(fsp, file_ace_list, false,
3887 &fsp->fsp_name->st, &acl_set_support);
3888 if (set_acl_as_root) {
3889 unbecome_root();
3890 }
3891 if (acl_set_support && ret == false) {
3892 DEBUG(3,("set_nt_acl: failed to set file acl on file "
3893 "%s (%s).\n", fsp_str_dbg(fsp),
3894 strerror(errno)));
3895 free_canon_ace_list(file_ace_list);
3896 free_canon_ace_list(dir_ace_list);
3897 return map_nt_error_from_unix(errno);
3898 }
3899 }
3900
3901 if (acl_perms && acl_set_support && fsp->is_directory) {
3902 if (dir_ace_list) {
3903 if (set_acl_as_root) {
3904 become_root();
3905 }
3906 ret = set_canon_ace_list(fsp, dir_ace_list, true,
3907 &fsp->fsp_name->st,
3908 &acl_set_support);
3909 if (set_acl_as_root) {
3910 unbecome_root();
3911 }
3912 if (ret == false) {
3913 DEBUG(3,("set_nt_acl: failed to set default "
3914 "acl on directory %s (%s).\n",
3915 fsp_str_dbg(fsp), strerror(errno)));
3916 free_canon_ace_list(file_ace_list);
3917 free_canon_ace_list(dir_ace_list);
3918 return map_nt_error_from_unix(errno);
3919 }
3920 } else {
3921 int sret = -1;
3922
3923 /*
3924 * No default ACL - delete one if it exists.
3925 */
3926
3927 if (set_acl_as_root) {
3928 become_root();
3929 }
3930 sret = SMB_VFS_SYS_ACL_DELETE_DEF_FILE(conn,
3931 fsp->fsp_name);
3932 if (set_acl_as_root) {
3933 unbecome_root();
3934 }
3935 if (sret == -1) {
3936 if (acl_group_override(conn, fsp->fsp_name)) {
3937 DEBUG(5,("set_nt_acl: acl group "
3938 "control on and current user "
3939 "in file %s primary group. "
3940 "Override delete_def_acl\n",
3941 fsp_str_dbg(fsp)));
3942
3943 become_root();
3944 sret =
3945 SMB_VFS_SYS_ACL_DELETE_DEF_FILE(
3946 conn,
3947 fsp->fsp_name);
3948 unbecome_root();
3949 }
3950
3951 if (sret == -1) {
3952 DEBUG(3,("set_nt_acl: sys_acl_delete_def_file failed (%s)\n", strerror(errno)));
3953 free_canon_ace_list(file_ace_list);
3954 free_canon_ace_list(dir_ace_list);
3955 return map_nt_error_from_unix(errno);
3956 }
3957 }
3958 }
3959 }
3960
3961 if (acl_set_support) {
3962 if (set_acl_as_root) {
3963 become_root();
3964 }
3965 store_inheritance_attributes(fsp,
3966 file_ace_list,
3967 dir_ace_list,
3968 psd->type);
3969 if (set_acl_as_root) {
3970 unbecome_root();
3971 }
3972 }
3973
3974 /*
3975 * If we cannot set using POSIX ACLs we fall back to checking if we need to chmod.
3976 */
3977
3978 if(!acl_set_support && acl_perms) {
3979 mode_t posix_perms;
3980
3981 if (!convert_canon_ace_to_posix_perms( fsp, file_ace_list, &posix_perms)) {
3982 free_canon_ace_list(file_ace_list);
3983 free_canon_ace_list(dir_ace_list);
3984 DEBUG(3,("set_nt_acl: failed to convert file acl to "
3985 "posix permissions for file %s.\n",
3986 fsp_str_dbg(fsp)));
3987 return NT_STATUS_ACCESS_DENIED;
3988 }
3989
3990 if (orig_mode != posix_perms) {
3991 int sret = -1;
3992
3993 DEBUG(3,("set_nt_acl: chmod %s. perms = 0%o.\n",
3994 fsp_str_dbg(fsp), (unsigned int)posix_perms));
3995
3996 if (set_acl_as_root) {
3997 become_root();
3998 }
3999 sret = SMB_VFS_CHMOD(conn, fsp->fsp_name,
4000 posix_perms);
4001 if (set_acl_as_root) {
4002 unbecome_root();
4003 }
4004 if(sret == -1) {
4005 if (acl_group_override(conn, fsp->fsp_name)) {
4006 DEBUG(5,("set_nt_acl: acl group "
4007 "control on and current user "
4008 "in file %s primary group. "
4009 "Override chmod\n",
4010 fsp_str_dbg(fsp)));
4011
4012 become_root();
4013 sret = SMB_VFS_CHMOD(conn,
4014 fsp->fsp_name,
4015 posix_perms);
4016 unbecome_root();
4017 }
4018
4019 if (sret == -1) {
4020 DEBUG(3,("set_nt_acl: chmod %s, 0%o "
4021 "failed. Error = %s.\n",
4022 fsp_str_dbg(fsp),
4023 (unsigned int)posix_perms,
4024 strerror(errno)));
4025 free_canon_ace_list(file_ace_list);
4026 free_canon_ace_list(dir_ace_list);
4027 return map_nt_error_from_unix(errno);
4028 }
4029 }
4030 }
4031 }
4032
4033 free_canon_ace_list(file_ace_list);
4034 free_canon_ace_list(dir_ace_list);
4035
4036 /* Ensure the stat struct in the fsp is correct. */
4037 status = vfs_stat_fsp(fsp);
4038
4039 return NT_STATUS_OK;
4040 }
4041
4042 /****************************************************************************
4043 Get the actual group bits stored on a file with an ACL. Has no effect if
4044 the file has no ACL. Needed in dosmode code where the stat() will return
4045 the mask bits, not the real group bits, for a file with an ACL.
4046 ****************************************************************************/
4047
4048 int get_acl_group_bits( connection_struct *conn,
4049 const struct smb_filename *smb_fname,
4050 mode_t *mode )
4051 {
4052 int entry_id = SMB_ACL_FIRST_ENTRY;
4053 SMB_ACL_ENTRY_T entry;
4054 SMB_ACL_T posix_acl;
4055 int result = -1;
4056
4057 posix_acl = SMB_VFS_SYS_ACL_GET_FILE(conn, smb_fname,
4058 SMB_ACL_TYPE_ACCESS, talloc_tos());
4059 if (posix_acl == (SMB_ACL_T)NULL)
4060 return -1;
4061
4062 while (sys_acl_get_entry(posix_acl, entry_id, &entry) == 1) {
4063 SMB_ACL_TAG_T tagtype;
4064 SMB_ACL_PERMSET_T permset;
4065
4066 entry_id = SMB_ACL_NEXT_ENTRY;
4067
4068 if (sys_acl_get_tag_type(entry, &tagtype) ==-1)
4069 break;
4070
4071 if (tagtype == SMB_ACL_GROUP_OBJ) {
4072 if (sys_acl_get_permset(entry, &permset) == -1) {
4073 break;
4074 } else {
4075 *mode &= ~(S_IRGRP|S_IWGRP|S_IXGRP);
4076 *mode |= (sys_acl_get_perm(permset, SMB_ACL_READ) ? S_IRGRP : 0);
4077 *mode |= (sys_acl_get_perm(permset, SMB_ACL_WRITE) ? S_IWGRP : 0);
4078 *mode |= (sys_acl_get_perm(permset, SMB_ACL_EXECUTE) ? S_IXGRP : 0);
4079 result = 0;
4080 break;
4081 }
4082 }
4083 }
4084 TALLOC_FREE(posix_acl);
4085 return result;
4086 }
4087
4088 /****************************************************************************
4089 Do a chmod by setting the ACL USER_OBJ, GROUP_OBJ and OTHER bits in an ACL
4090 and set the mask to rwx. Needed to preserve complex ACLs set by NT.
4091 ****************************************************************************/
4092
4093 static int chmod_acl_internals( connection_struct *conn, SMB_ACL_T posix_acl, mode_t mode)
4094 {
4095 int entry_id = SMB_ACL_FIRST_ENTRY;
4096 SMB_ACL_ENTRY_T entry;
4097 int num_entries = 0;
4098
4099 while ( sys_acl_get_entry(posix_acl, entry_id, &entry) == 1) {
4100 SMB_ACL_TAG_T tagtype;
4101 SMB_ACL_PERMSET_T permset;
4102 mode_t perms;
4103
4104 entry_id = SMB_ACL_NEXT_ENTRY;
4105
4106 if (sys_acl_get_tag_type(entry, &tagtype) == -1)
4107 return -1;
4108
4109 if (sys_acl_get_permset(entry, &permset) == -1)
4110 return -1;
4111
4112 num_entries++;
4113
4114 switch(tagtype) {
4115 case SMB_ACL_USER_OBJ:
4116 perms = unix_perms_to_acl_perms(mode, S_IRUSR, S_IWUSR, S_IXUSR);
4117 break;
4118 case SMB_ACL_GROUP_OBJ:
4119 perms = unix_perms_to_acl_perms(mode, S_IRGRP, S_IWGRP, S_IXGRP);
4120 break;
4121 case SMB_ACL_MASK:
4122 /*
4123 * FIXME: The ACL_MASK entry permissions should really be set to
4124 * the union of the permissions of all ACL_USER,
4125 * ACL_GROUP_OBJ, and ACL_GROUP entries. That's what
4126 * acl_calc_mask() does, but Samba ACLs doesn't provide it.
4127 */
4128 perms = S_IRUSR|S_IWUSR|S_IXUSR;
4129 break;
4130 case SMB_ACL_OTHER:
4131 perms = unix_perms_to_acl_perms(mode, S_IROTH, S_IWOTH, S_IXOTH);
4132 break;
4133 default:
4134 continue;
4135 }
4136
4137 if (map_acl_perms_to_permset(conn, perms, &permset) == -1)
4138 return -1;
4139
4140 if (sys_acl_set_permset(entry, permset) == -1)
4141 return -1;
4142 }
4143
4144 /*
4145 * If this is a simple 3 element ACL or no elements then it's a standard
4146 * UNIX permission set. Just use chmod...
4147 */
4148
4149 if ((num_entries == 3) || (num_entries == 0))
4150 return -1;
4151
4152 return 0;
4153 }
4154
4155 /****************************************************************************
4156 Get the access ACL of FROM, do a chmod by setting the ACL USER_OBJ,
4157 GROUP_OBJ and OTHER bits in an ACL and set the mask to rwx. Set the
4158 resulting ACL on TO. Note that name is in UNIX character set.
4159 ****************************************************************************/
4160
4161 static int copy_access_posix_acl(connection_struct *conn,
4162 const struct smb_filename *smb_fname_from,
4163 const struct smb_filename *smb_fname_to,
4164 mode_t mode)
4165 {
4166 SMB_ACL_T posix_acl = NULL;
4167 int ret = -1;
4168
4169 if ((posix_acl = SMB_VFS_SYS_ACL_GET_FILE(conn, smb_fname_from,
4170 SMB_ACL_TYPE_ACCESS,
4171 talloc_tos())) == NULL)
4172 return -1;
4173
4174 if ((ret = chmod_acl_internals(conn, posix_acl, mode)) == -1)
4175 goto done;
4176
4177 ret = SMB_VFS_SYS_ACL_SET_FILE(conn, smb_fname_to,
4178 SMB_ACL_TYPE_ACCESS, posix_acl);
4179
4180 done:
4181
4182 TALLOC_FREE(posix_acl);
4183 return ret;
4184 }
4185
4186 /****************************************************************************
4187 Do a chmod by setting the ACL USER_OBJ, GROUP_OBJ and OTHER bits in an ACL
4188 and set the mask to rwx. Needed to preserve complex ACLs set by NT.
4189 Note that name is in UNIX character set.
4190 ****************************************************************************/
4191
4192 int chmod_acl(connection_struct *conn,
4193 const struct smb_filename *smb_fname,
4194 mode_t mode)
4195 {
4196 return copy_access_posix_acl(conn, smb_fname, smb_fname, mode);
4197 }
4198
4199 /****************************************************************************
4200 Check for an existing default POSIX ACL on a directory.
4201 ****************************************************************************/
4202
4203 static bool directory_has_default_posix_acl(connection_struct *conn,
4204 const struct smb_filename *smb_fname)
4205 {
4206 SMB_ACL_T def_acl = SMB_VFS_SYS_ACL_GET_FILE(conn, smb_fname,
4207 SMB_ACL_TYPE_DEFAULT,
4208 talloc_tos());
4209 bool has_acl = False;
4210 SMB_ACL_ENTRY_T entry;
4211
4212 if (def_acl != NULL && (sys_acl_get_entry(def_acl, SMB_ACL_FIRST_ENTRY, &entry) == 1)) {
4213 has_acl = True;
4214 }
4215
4216 if (def_acl) {
4217 TALLOC_FREE(def_acl);
4218 }
4219 return has_acl;
4220 }
4221
4222 /****************************************************************************
4223 If the parent directory has no default ACL but it does have an Access ACL,
4224 inherit this Access ACL to file name.
4225 ****************************************************************************/
4226
4227 int inherit_access_posix_acl(connection_struct *conn,
4228 const char *inherit_from_dir,
4229 const struct smb_filename *smb_fname,
4230 mode_t mode)
4231 {
4232 struct smb_filename *inherit_from_fname =
4233 synthetic_smb_fname(talloc_tos(),
4234 smb_fname->base_name,
4235 NULL,
4236 NULL,
4237 smb_fname->flags);
4238 if (inherit_from_fname == NULL) {
4239 return-1;
4240 }
4241
4242 if (directory_has_default_posix_acl(conn, inherit_from_fname))
4243 return 0;
4244
4245 return copy_access_posix_acl(conn, inherit_from_fname, smb_fname, mode);
4246 }
4247
4248 /****************************************************************************
4249 Do an fchmod by setting the ACL USER_OBJ, GROUP_OBJ and OTHER bits in an ACL
4250 and set the mask to rwx. Needed to preserve complex ACLs set by NT.
4251 ****************************************************************************/
4252
4253 int fchmod_acl(files_struct *fsp, mode_t mode)
4254 {
4255 connection_struct *conn = fsp->conn;
4256 SMB_ACL_T posix_acl = NULL;
4257 int ret = -1;
4258
4259 if ((posix_acl = SMB_VFS_SYS_ACL_GET_FD(fsp, talloc_tos())) == NULL)
4260 return -1;
4261
4262 if ((ret = chmod_acl_internals(conn, posix_acl, mode)) == -1)
4263 goto done;
4264
4265 ret = SMB_VFS_SYS_ACL_SET_FD(fsp, posix_acl);
4266
4267 done:
4268
4269 TALLOC_FREE(posix_acl);
4270 return ret;
4271 }
4272
4273 /****************************************************************************
4274 Map from wire type to permset.
4275 ****************************************************************************/
4276
4277 static bool unix_ex_wire_to_permset(connection_struct *conn, unsigned char wire_perm, SMB_ACL_PERMSET_T *p_permset)
4278 {
4279 if (wire_perm & ~(SMB_POSIX_ACL_READ|SMB_POSIX_ACL_WRITE|SMB_POSIX_ACL_EXECUTE)) {
4280 return False;
4281 }
4282
4283 if (sys_acl_clear_perms(*p_permset) == -1) {
4284 return False;
4285 }
4286
4287 if (wire_perm & SMB_POSIX_ACL_READ) {
4288 if (sys_acl_add_perm(*p_permset, SMB_ACL_READ) == -1) {
4289 return False;
4290 }
4291 }
4292 if (wire_perm & SMB_POSIX_ACL_WRITE) {
4293 if (sys_acl_add_perm(*p_permset, SMB_ACL_WRITE) == -1) {
4294 return False;
4295 }
4296 }
4297 if (wire_perm & SMB_POSIX_ACL_EXECUTE) {
4298 if (sys_acl_add_perm(*p_permset, SMB_ACL_EXECUTE) == -1) {
4299 return False;
4300 }
4301 }
4302 return True;
4303 }
4304
4305 /****************************************************************************
4306 Map from wire type to tagtype.
4307 ****************************************************************************/
4308
4309 static bool unix_ex_wire_to_tagtype(unsigned char wire_tt, SMB_ACL_TAG_T *p_tt)
4310 {
4311 switch (wire_tt) {
4312 case SMB_POSIX_ACL_USER_OBJ:
4313 *p_tt = SMB_ACL_USER_OBJ;
4314 break;
4315 case SMB_POSIX_ACL_USER:
4316 *p_tt = SMB_ACL_USER;
4317 break;
4318 case SMB_POSIX_ACL_GROUP_OBJ:
4319 *p_tt = SMB_ACL_GROUP_OBJ;
4320 break;
4321 case SMB_POSIX_ACL_GROUP:
4322 *p_tt = SMB_ACL_GROUP;
4323 break;
4324 case SMB_POSIX_ACL_MASK:
4325 *p_tt = SMB_ACL_MASK;
4326 break;
4327 case SMB_POSIX_ACL_OTHER:
4328 *p_tt = SMB_ACL_OTHER;
4329 break;
4330 default:
4331 return False;
4332 }
4333 return True;
4334 }
4335
4336 /****************************************************************************
4337 Create a new POSIX acl from wire permissions.
4338 FIXME ! How does the share mask/mode fit into this.... ?
4339 ****************************************************************************/
4340
4341 static SMB_ACL_T create_posix_acl_from_wire(connection_struct *conn,
4342 uint16_t num_acls,
4343 const char *pdata,
4344 TALLOC_CTX *mem_ctx)
4345 {
4346 unsigned int i;
4347 SMB_ACL_T the_acl = sys_acl_init(mem_ctx);
4348
4349 if (the_acl == NULL) {
4350 return NULL;
4351 }
4352
4353 for (i = 0; i < num_acls; i++) {
4354 SMB_ACL_ENTRY_T the_entry;
4355 SMB_ACL_PERMSET_T the_permset;
4356 SMB_ACL_TAG_T tag_type;
4357
4358 if (sys_acl_create_entry(&the_acl, &the_entry) == -1) {
4359 DEBUG(0,("create_posix_acl_from_wire: Failed to create entry %u. (%s)\n",
4360 i, strerror(errno) ));
4361 goto fail;
4362 }
4363
4364 if (!unix_ex_wire_to_tagtype(CVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)), &tag_type)) {
4365 DEBUG(0,("create_posix_acl_from_wire: invalid wire tagtype %u on entry %u.\n",
4366 CVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)), i ));
4367 goto fail;
4368 }
4369
4370 if (sys_acl_set_tag_type(the_entry, tag_type) == -1) {
4371 DEBUG(0,("create_posix_acl_from_wire: Failed to set tagtype on entry %u. (%s)\n",
4372 i, strerror(errno) ));
4373 goto fail;
4374 }
4375
4376 /* Get the permset pointer from the new ACL entry. */
4377 if (sys_acl_get_permset(the_entry, &the_permset) == -1) {
4378 DEBUG(0,("create_posix_acl_from_wire: Failed to get permset on entry %u. (%s)\n",
4379 i, strerror(errno) ));
4380 goto fail;
4381 }
4382
4383 /* Map from wire to permissions. */
4384 if (!unix_ex_wire_to_permset(conn, CVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)+1), &the_permset)) {
4385 DEBUG(0,("create_posix_acl_from_wire: invalid permset %u on entry %u.\n",
4386 CVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE) + 1), i ));
4387 goto fail;
4388 }
4389
4390 /* Now apply to the new ACL entry. */
4391 if (sys_acl_set_permset(the_entry, the_permset) == -1) {
4392 DEBUG(0,("create_posix_acl_from_wire: Failed to add permset on entry %u. (%s)\n",
4393 i, strerror(errno) ));
4394 goto fail;
4395 }
4396
4397 if (tag_type == SMB_ACL_USER) {
4398 uint32_t uidval = IVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)+2);
4399 uid_t uid = (uid_t)uidval;
4400 if (sys_acl_set_qualifier(the_entry,(void *)&uid) == -1) {
4401 DEBUG(0,("create_posix_acl_from_wire: Failed to set uid %u on entry %u. (%s)\n",
4402 (unsigned int)uid, i, strerror(errno) ));
4403 goto fail;
4404 }
4405 }
4406
4407 if (tag_type == SMB_ACL_GROUP) {
4408 uint32_t gidval = IVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)+2);
4409 gid_t gid = (uid_t)gidval;
4410 if (sys_acl_set_qualifier(the_entry,(void *)&gid) == -1) {
4411 DEBUG(0,("create_posix_acl_from_wire: Failed to set gid %u on entry %u. (%s)\n",
4412 (unsigned int)gid, i, strerror(errno) ));
4413 goto fail;
4414 }
4415 }
4416 }
4417
4418 return the_acl;
4419
4420 fail:
4421
4422 if (the_acl != NULL) {
4423 TALLOC_FREE(the_acl);
4424 }
4425 return NULL;
4426 }
4427
4428 /****************************************************************************
4429 Calls from UNIX extensions - Default POSIX ACL set.
4430 If num_def_acls == 0 and not a directory just return. If it is a directory
4431 and num_def_acls == 0 then remove the default acl. Else set the default acl
4432 on the directory.
4433 ****************************************************************************/
4434
4435 bool set_unix_posix_default_acl(connection_struct *conn,
4436 const struct smb_filename *smb_fname,
4437 uint16_t num_def_acls,
4438 const char *pdata)
4439 {
4440 SMB_ACL_T def_acl = NULL;
4441
4442 if (!S_ISDIR(smb_fname->st.st_ex_mode)) {
4443 if (num_def_acls) {
4444 DEBUG(5,("set_unix_posix_default_acl: Can't "
4445 "set default ACL on non-directory file %s\n",
4446 smb_fname->base_name ));
4447 errno = EISDIR;
4448 return False;
4449 } else {
4450 return True;
4451 }
4452 }
4453
4454 if (!num_def_acls) {
4455 /* Remove the default ACL. */
4456 if (SMB_VFS_SYS_ACL_DELETE_DEF_FILE(conn, smb_fname) == -1) {
4457 DEBUG(5,("set_unix_posix_default_acl: acl_delete_def_file failed on directory %s (%s)\n",
4458 smb_fname->base_name, strerror(errno) ));
4459 return False;
4460 }
4461 return True;
4462 }
4463
4464 if ((def_acl = create_posix_acl_from_wire(conn, num_def_acls,
4465 pdata,
4466 talloc_tos())) == NULL) {
4467 return False;
4468 }
4469
4470 if (SMB_VFS_SYS_ACL_SET_FILE(conn, smb_fname,
4471 SMB_ACL_TYPE_DEFAULT, def_acl) == -1) {
4472 DEBUG(5,("set_unix_posix_default_acl: acl_set_file failed on directory %s (%s)\n",
4473 smb_fname->base_name, strerror(errno) ));
4474 TALLOC_FREE(def_acl);
4475 return False;
4476 }
4477
4478 DEBUG(10,("set_unix_posix_default_acl: set default acl for file %s\n",
4479 smb_fname->base_name ));
4480 TALLOC_FREE(def_acl);
4481 return True;
4482 }
4483
4484 /****************************************************************************
4485 Remove an ACL from a file. As we don't have acl_delete_entry() available
4486 we must read the current acl and copy all entries except MASK, USER and GROUP
4487 to a new acl, then set that. This (at least on Linux) causes any ACL to be
4488 removed.
4489 FIXME ! How does the share mask/mode fit into this.... ?
4490 ****************************************************************************/
4491
4492 static bool remove_posix_acl(connection_struct *conn,
4493 files_struct *fsp,
4494 const struct smb_filename *smb_fname)
4495 {
4496 SMB_ACL_T file_acl = NULL;
4497 int entry_id = SMB_ACL_FIRST_ENTRY;
4498 SMB_ACL_ENTRY_T entry;
4499 bool ret = False;
4500 const char *fname = smb_fname->base_name;
4501 /* Create a new ACL with only 3 entries, u/g/w. */
4502 SMB_ACL_T new_file_acl = sys_acl_init(talloc_tos());
4503 SMB_ACL_ENTRY_T user_ent = NULL;
4504 SMB_ACL_ENTRY_T group_ent = NULL;
4505 SMB_ACL_ENTRY_T other_ent = NULL;
4506
4507 if (new_file_acl == NULL) {
4508 DEBUG(5,("remove_posix_acl: failed to init new ACL with 3 entries for file %s.\n", fname));
4509 return False;
4510 }
4511
4512 /* Now create the u/g/w entries. */
4513 if (sys_acl_create_entry(&new_file_acl, &user_ent) == -1) {
4514 DEBUG(5,("remove_posix_acl: Failed to create user entry for file %s. (%s)\n",
4515 fname, strerror(errno) ));
4516 goto done;
4517 }
4518 if (sys_acl_set_tag_type(user_ent, SMB_ACL_USER_OBJ) == -1) {
4519 DEBUG(5,("remove_posix_acl: Failed to set user entry for file %s. (%s)\n",
4520 fname, strerror(errno) ));
4521 goto done;
4522 }
4523
4524 if (sys_acl_create_entry(&new_file_acl, &group_ent) == -1) {
4525 DEBUG(5,("remove_posix_acl: Failed to create group entry for file %s. (%s)\n",
4526 fname, strerror(errno) ));
4527 goto done;
4528 }
4529 if (sys_acl_set_tag_type(group_ent, SMB_ACL_GROUP_OBJ) == -1) {
4530 DEBUG(5,("remove_posix_acl: Failed to set group entry for file %s. (%s)\n",
4531 fname, strerror(errno) ));
4532 goto done;
4533 }
4534
4535 if (sys_acl_create_entry(&new_file_acl, &other_ent) == -1) {
4536 DEBUG(5,("remove_posix_acl: Failed to create other entry for file %s. (%s)\n",
4537 fname, strerror(errno) ));
4538 goto done;
4539 }
4540 if (sys_acl_set_tag_type(other_ent, SMB_ACL_OTHER) == -1) {
4541 DEBUG(5,("remove_posix_acl: Failed to set other entry for file %s. (%s)\n",
4542 fname, strerror(errno) ));
4543 goto done;
4544 }
4545
4546 /* Get the current file ACL. */
4547 if (fsp && fsp->fh->fd != -1) {
4548 file_acl = SMB_VFS_SYS_ACL_GET_FD(fsp, talloc_tos());
4549 } else {
4550 file_acl = SMB_VFS_SYS_ACL_GET_FILE(conn, smb_fname,
4551 SMB_ACL_TYPE_ACCESS,
4552 talloc_tos());
4553 }
4554
4555 if (file_acl == NULL) {
4556 /* This is only returned if an error occurred. Even for a file with
4557 no acl a u/g/w acl should be returned. */
4558 DEBUG(5,("remove_posix_acl: failed to get ACL from file %s (%s).\n",
4559 fname, strerror(errno) ));
4560 goto done;
4561 }
4562
4563 while ( sys_acl_get_entry(file_acl, entry_id, &entry) == 1) {
4564 SMB_ACL_TAG_T tagtype;
4565 SMB_ACL_PERMSET_T permset;
4566
4567 entry_id = SMB_ACL_NEXT_ENTRY;
4568
4569 if (sys_acl_get_tag_type(entry, &tagtype) == -1) {
4570 DEBUG(5,("remove_posix_acl: failed to get tagtype from ACL on file %s (%s).\n",
4571 fname, strerror(errno) ));
4572 goto done;
4573 }
4574
4575 if (sys_acl_get_permset(entry, &permset) == -1) {
4576 DEBUG(5,("remove_posix_acl: failed to get permset from ACL on file %s (%s).\n",
4577 fname, strerror(errno) ));
4578 goto done;
4579 }
4580
4581 if (tagtype == SMB_ACL_USER_OBJ) {
4582 if (sys_acl_set_permset(user_ent, permset) == -1) {
4583 DEBUG(5,("remove_posix_acl: failed to set permset from ACL on file %s (%s).\n",
4584 fname, strerror(errno) ));
4585 }
4586 } else if (tagtype == SMB_ACL_GROUP_OBJ) {
4587 if (sys_acl_set_permset(group_ent, permset) == -1) {
4588 DEBUG(5,("remove_posix_acl: failed to set permset from ACL on file %s (%s).\n",
4589 fname, strerror(errno) ));
4590 }
4591 } else if (tagtype == SMB_ACL_OTHER) {
4592 if (sys_acl_set_permset(other_ent, permset) == -1) {
4593 DEBUG(5,("remove_posix_acl: failed to set permset from ACL on file %s (%s).\n",
4594 fname, strerror(errno) ));
4595 }
4596 }
4597 }
4598
4599 /* Set the new empty file ACL. */
4600 if (fsp && fsp->fh->fd != -1) {
4601 if (SMB_VFS_SYS_ACL_SET_FD(fsp, new_file_acl) == -1) {
4602 DEBUG(5,("remove_posix_acl: acl_set_file failed on %s (%s)\n",
4603 fname, strerror(errno) ));
4604 goto done;
4605 }
4606 } else {
4607 if (SMB_VFS_SYS_ACL_SET_FILE(conn,
4608 smb_fname,
4609 SMB_ACL_TYPE_ACCESS,
4610 new_file_acl) == -1) {
4611 DEBUG(5,("remove_posix_acl: acl_set_file failed on %s (%s)\n",
4612 fname, strerror(errno) ));
4613 goto done;
4614 }
4615 }
4616
4617 ret = True;
4618
4619 done:
4620
4621 if (file_acl) {
4622 TALLOC_FREE(file_acl);
4623 }
4624 if (new_file_acl) {
4625 TALLOC_FREE(new_file_acl);
4626 }
4627 return ret;
4628 }
4629
4630 /****************************************************************************
4631 Calls from UNIX extensions - POSIX ACL set.
4632 If num_def_acls == 0 then read/modify/write acl after removing all entries
4633 except SMB_ACL_USER_OBJ, SMB_ACL_GROUP_OBJ, SMB_ACL_OTHER.
4634 ****************************************************************************/
4635
4636 bool set_unix_posix_acl(connection_struct *conn, files_struct *fsp,
4637 const struct smb_filename *smb_fname,
4638 uint16_t num_acls,
4639 const char *pdata)
4640 {
4641 SMB_ACL_T file_acl = NULL;
4642 const char *fname = smb_fname->base_name;
4643
4644 if (!num_acls) {
4645 /* Remove the ACL from the file. */
4646 return remove_posix_acl(conn, fsp, smb_fname);
4647 }
4648
4649 if ((file_acl = create_posix_acl_from_wire(conn, num_acls,
4650 pdata,
4651 talloc_tos())) == NULL) {
4652 return False;
4653 }
4654
4655 if (fsp && fsp->fh->fd != -1) {
4656 /* The preferred way - use an open fd. */
4657 if (SMB_VFS_SYS_ACL_SET_FD(fsp, file_acl) == -1) {
4658 DEBUG(5,("set_unix_posix_acl: acl_set_file failed on %s (%s)\n",
4659 fname, strerror(errno) ));
4660 TALLOC_FREE(file_acl);
4661 return False;
4662 }
4663 } else {
4664 if (SMB_VFS_SYS_ACL_SET_FILE(conn, smb_fname,
4665 SMB_ACL_TYPE_ACCESS, file_acl) == -1) {
4666 DEBUG(5,("set_unix_posix_acl: acl_set_file failed on %s (%s)\n",
4667 fname, strerror(errno) ));
4668 TALLOC_FREE(file_acl);
4669 return False;
4670 }
4671 }
4672
4673 DEBUG(10,("set_unix_posix_acl: set acl for file %s\n", fname ));
4674 TALLOC_FREE(file_acl);
4675 return True;
4676 }
4677
4678 /********************************************************************
4679 Pull the NT ACL from a file on disk or the OpenEventlog() access
4680 check. Caller is responsible for freeing the returned security
4681 descriptor via TALLOC_FREE(). This is designed for dealing with
4682 user space access checks in smbd outside of the VFS. For example,
4683 checking access rights in OpenEventlog() or from python.
4684
4685 ********************************************************************/
4686
4687 NTSTATUS get_nt_acl_no_snum(TALLOC_CTX *ctx, const char *fname,
4688 uint32_t security_info_wanted,
4689 struct security_descriptor **sd)
4690 {
4691 TALLOC_CTX *frame = talloc_stackframe();
4692 connection_struct *conn;
4693 NTSTATUS status = NT_STATUS_OK;
4694 struct smb_filename *smb_fname = synthetic_smb_fname(talloc_tos(),
4695 fname,
4696 NULL,
4697 NULL,
4698 0);
4699
4700 if (smb_fname == NULL) {
4701 TALLOC_FREE(frame);
4702 return NT_STATUS_NO_MEMORY;
4703 }
4704
4705 if (!posix_locking_init(false)) {
4706 TALLOC_FREE(frame);
4707 return NT_STATUS_NO_MEMORY;
4708 }
4709
4710 status = create_conn_struct(ctx,
4711 server_event_context(),
4712 server_messaging_context(),
4713 &conn,
4714 -1,
4715 "/",
4716 NULL);
4717
4718 if (!NT_STATUS_IS_OK(status)) {
4719 DEBUG(0,("create_conn_struct returned %s.\n",
4720 nt_errstr(status)));
4721 TALLOC_FREE(frame);
4722 return status;
4723 }
4724
4725 status = SMB_VFS_GET_NT_ACL(conn,
4726 smb_fname,
4727 security_info_wanted,
4728 ctx,
4729 sd);
4730 if (!NT_STATUS_IS_OK(status)) {
4731 DEBUG(0, ("get_nt_acl_no_snum: SMB_VFS_GET_NT_ACL returned %s.\n",
4732 nt_errstr(status)));
4733 }
4734
4735 conn_free(conn);
4736 TALLOC_FREE(frame);
4737
4738 return status;
4739 }
4740
4741 int posix_sys_acl_blob_get_file(vfs_handle_struct *handle,
4742 const struct smb_filename *smb_fname_in,
4743 TALLOC_CTX *mem_ctx,
4744 char **blob_description,
4745 DATA_BLOB *blob)
4746 {
4747 int ret;
4748 TALLOC_CTX *frame = talloc_stackframe();
4749 /* Initialise this to zero, in a portable way */
4750 struct smb_acl_wrapper acl_wrapper = {
4751 NULL
4752 };
4753 struct smb_filename *smb_fname = cp_smb_filename_nostream(frame,
4754 smb_fname_in);
4755 if (smb_fname == NULL) {
4756 TALLOC_FREE(frame);
4757 errno = ENOMEM;
4758 return -1;
4759 }
4760
4761 acl_wrapper.access_acl
4762 = smb_vfs_call_sys_acl_get_file(handle,
4763 smb_fname,
4764 SMB_ACL_TYPE_ACCESS,
4765 frame);
4766
4767 ret = smb_vfs_call_stat(handle, smb_fname);
4768 if (ret == -1) {
4769 TALLOC_FREE(frame);
4770 return -1;
4771 }
4772
4773 if (S_ISDIR(smb_fname->st.st_ex_mode)) {
4774 acl_wrapper.default_acl
4775 = smb_vfs_call_sys_acl_get_file(handle,
4776 smb_fname,
4777 SMB_ACL_TYPE_DEFAULT,
4778 frame);
4779 }
4780
4781 acl_wrapper.owner = smb_fname->st.st_ex_uid;
4782 acl_wrapper.group = smb_fname->st.st_ex_gid;
4783 acl_wrapper.mode = smb_fname->st.st_ex_mode;
4784
4785 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_push_struct_blob(blob, mem_ctx,
4786 &acl_wrapper,
4787 (ndr_push_flags_fn_t)ndr_push_smb_acl_wrapper))) {
4788 errno = EINVAL;
4789 TALLOC_FREE(frame);
4790 return -1;
4791 }
4792
4793 *blob_description = talloc_strdup(mem_ctx, "posix_acl");
4794 if (!*blob_description) {
4795 errno = EINVAL;
4796 TALLOC_FREE(frame);
4797 return -1;
4798 }
4799
4800 TALLOC_FREE(frame);
4801 return 0;
4802 }
4803
4804 int posix_sys_acl_blob_get_fd(vfs_handle_struct *handle,
4805 files_struct *fsp,
4806 TALLOC_CTX *mem_ctx,
4807 char **blob_description,
4808 DATA_BLOB *blob)
4809 {
4810 SMB_STRUCT_STAT sbuf;
4811 TALLOC_CTX *frame;
4812 struct smb_acl_wrapper acl_wrapper;
4813 int ret;
4814
4815 /* This ensures that we also consider the default ACL */
4816 if (fsp->is_directory || fsp->fh->fd == -1) {
4817 return posix_sys_acl_blob_get_file(handle,
4818 fsp->fsp_name,
4819 mem_ctx,
4820 blob_description,
4821 blob);
4822 }
4823 frame = talloc_stackframe();
4824
4825 acl_wrapper.default_acl = NULL;
4826
4827 acl_wrapper.access_acl = smb_vfs_call_sys_acl_get_file(handle,
4828 fsp->fsp_name,
4829 SMB_ACL_TYPE_ACCESS,
4830 frame);
4831
4832 ret = smb_vfs_call_fstat(handle, fsp, &sbuf);
4833 if (ret == -1) {
4834 TALLOC_FREE(frame);
4835 return -1;
4836 }
4837
4838 acl_wrapper.owner = sbuf.st_ex_uid;
4839 acl_wrapper.group = sbuf.st_ex_gid;
4840 acl_wrapper.mode = sbuf.st_ex_mode;
4841
4842 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_push_struct_blob(blob, mem_ctx,
4843 &acl_wrapper,
4844 (ndr_push_flags_fn_t)ndr_push_smb_acl_wrapper))) {
4845 errno = EINVAL;
4846 TALLOC_FREE(frame);
4847 return -1;
4848 }
4849
4850 *blob_description = talloc_strdup(mem_ctx, "posix_acl");
4851 if (!*blob_description) {
4852 errno = EINVAL;
4853 TALLOC_FREE(frame);
4854 return -1;
4855 }
4856
4857 TALLOC_FREE(frame);
4858 return 0;
4859 }
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