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Use is_default_acl variable in canonicalise_acl().
[Samba/gebeck_regimport.git] / source3 / smbd / posix_acls.c
blobb74c1b24b3c391ca0b807bb6fe7becc428e5500c
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 "lib/param/loadparm.h"
31
32 extern const struct generic_mapping file_generic_mapping;
33
34 #undef DBGC_CLASS
35 #define DBGC_CLASS DBGC_ACLS
36
37 /****************************************************************************
38 Data structures representing the internal ACE format.
39 ****************************************************************************/
40
41 enum ace_owner {UID_ACE, GID_ACE, WORLD_ACE};
42 enum ace_attribute {ALLOW_ACE, DENY_ACE}; /* Used for incoming NT ACLS. */
43
44 typedef struct canon_ace {
45 struct canon_ace *next, *prev;
46 SMB_ACL_TAG_T type;
47 mode_t perms; /* Only use S_I(R|W|X)USR mode bits here. */
48 struct dom_sid trustee;
49 enum ace_owner owner_type;
50 enum ace_attribute attr;
51 struct unixid unix_ug;
52 uint8_t ace_flags; /* From windows ACE entry. */
53 } canon_ace;
54
55 #define ALL_ACE_PERMS (S_IRUSR|S_IWUSR|S_IXUSR)
56
57 /*
58 * EA format of user.SAMBA_PAI (Samba_Posix_Acl_Interitance)
59 * attribute on disk - version 1.
60 * All values are little endian.
61 *
62 * | 1 | 1 | 2 | 2 | ....
63 * +------+------+-------------+---------------------+-------------+--------------------+
64 * | vers | flag | num_entries | num_default_entries | ..entries.. | default_entries... |
65 * +------+------+-------------+---------------------+-------------+--------------------+
66 *
67 * Entry format is :
68 *
69 * | 1 | 4 |
70 * +------+-------------------+
71 * | value| uid/gid or world |
72 * | type | value |
73 * +------+-------------------+
74 *
75 * Version 2 format. Stores extra Windows metadata about an ACL.
76 *
77 * | 1 | 2 | 2 | 2 | ....
78 * +------+----------+-------------+---------------------+-------------+--------------------+
79 * | vers | ace | num_entries | num_default_entries | ..entries.. | default_entries... |
80 * | 2 | type | | | | |
81 * +------+----------+-------------+---------------------+-------------+--------------------+
82 *
83 * Entry format is :
84 *
85 * | 1 | 1 | 4 |
86 * +------+------+-------------------+
87 * | ace | value| uid/gid or world |
88 * | flag | type | value |
89 * +------+-------------------+------+
90 *
91 */
92
93 #define PAI_VERSION_OFFSET 0
94
95 #define PAI_V1_FLAG_OFFSET 1
96 #define PAI_V1_NUM_ENTRIES_OFFSET 2
97 #define PAI_V1_NUM_DEFAULT_ENTRIES_OFFSET 4
98 #define PAI_V1_ENTRIES_BASE 6
99 #define PAI_V1_ACL_FLAG_PROTECTED 0x1
100 #define PAI_V1_ENTRY_LENGTH 5
101
102 #define PAI_V1_VERSION 1
103
104 #define PAI_V2_TYPE_OFFSET 1
105 #define PAI_V2_NUM_ENTRIES_OFFSET 3
106 #define PAI_V2_NUM_DEFAULT_ENTRIES_OFFSET 5
107 #define PAI_V2_ENTRIES_BASE 7
108 #define PAI_V2_ENTRY_LENGTH 6
109
110 #define PAI_V2_VERSION 2
111
112 /*
113 * In memory format of user.SAMBA_PAI attribute.
114 */
115
116 struct pai_entry {
117 struct pai_entry *next, *prev;
118 uint8_t ace_flags;
119 enum ace_owner owner_type;
120 struct unixid unix_ug;
121 };
122
123 struct pai_val {
124 uint16_t sd_type;
125 unsigned int num_entries;
126 struct pai_entry *entry_list;
127 unsigned int num_def_entries;
128 struct pai_entry *def_entry_list;
129 };
130
131 /************************************************************************
132 Return a uint32 of the pai_entry principal.
133 ************************************************************************/
134
135 static uint32_t get_pai_entry_val(struct pai_entry *paie)
136 {
137 switch (paie->owner_type) {
138 case UID_ACE:
139 DEBUG(10,("get_pai_entry_val: uid = %u\n", (unsigned int)paie->unix_ug.id ));
140 return (uint32_t)paie->unix_ug.id;
141 case GID_ACE:
142 DEBUG(10,("get_pai_entry_val: gid = %u\n", (unsigned int)paie->unix_ug.id ));
143 return (uint32_t)paie->unix_ug.id;
144 case WORLD_ACE:
145 default:
146 DEBUG(10,("get_pai_entry_val: world ace\n"));
147 return (uint32_t)-1;
148 }
149 }
150
151 /************************************************************************
152 Return a uint32 of the entry principal.
153 ************************************************************************/
154
155 static uint32_t get_entry_val(canon_ace *ace_entry)
156 {
157 switch (ace_entry->owner_type) {
158 case UID_ACE:
159 DEBUG(10,("get_entry_val: uid = %u\n", (unsigned int)ace_entry->unix_ug.id ));
160 return (uint32_t)ace_entry->unix_ug.id;
161 case GID_ACE:
162 DEBUG(10,("get_entry_val: gid = %u\n", (unsigned int)ace_entry->unix_ug.id ));
163 return (uint32_t)ace_entry->unix_ug.id;
164 case WORLD_ACE:
165 default:
166 DEBUG(10,("get_entry_val: world ace\n"));
167 return (uint32_t)-1;
168 }
169 }
170
171 /************************************************************************
172 Create the on-disk format (always v2 now). Caller must free.
173 ************************************************************************/
174
175 static char *create_pai_buf_v2(canon_ace *file_ace_list,
176 canon_ace *dir_ace_list,
177 uint16_t sd_type,
178 size_t *store_size)
179 {
180 char *pai_buf = NULL;
181 canon_ace *ace_list = NULL;
182 char *entry_offset = NULL;
183 unsigned int num_entries = 0;
184 unsigned int num_def_entries = 0;
185 unsigned int i;
186
187 for (ace_list = file_ace_list; ace_list; ace_list = ace_list->next) {
188 num_entries++;
189 }
190
191 for (ace_list = dir_ace_list; ace_list; ace_list = ace_list->next) {
192 num_def_entries++;
193 }
194
195 DEBUG(10,("create_pai_buf_v2: num_entries = %u, num_def_entries = %u\n", num_entries, num_def_entries ));
196
197 *store_size = PAI_V2_ENTRIES_BASE +
198 ((num_entries + num_def_entries)*PAI_V2_ENTRY_LENGTH);
199
200 pai_buf = talloc_array(talloc_tos(), char, *store_size);
201 if (!pai_buf) {
202 return NULL;
203 }
204
205 /* Set up the header. */
206 memset(pai_buf, '\0', PAI_V2_ENTRIES_BASE);
207 SCVAL(pai_buf,PAI_VERSION_OFFSET,PAI_V2_VERSION);
208 SSVAL(pai_buf,PAI_V2_TYPE_OFFSET, sd_type);
209 SSVAL(pai_buf,PAI_V2_NUM_ENTRIES_OFFSET,num_entries);
210 SSVAL(pai_buf,PAI_V2_NUM_DEFAULT_ENTRIES_OFFSET,num_def_entries);
211
212 DEBUG(10,("create_pai_buf_v2: sd_type = 0x%x\n",
213 (unsigned int)sd_type ));
214
215 entry_offset = pai_buf + PAI_V2_ENTRIES_BASE;
216
217 i = 0;
218 for (ace_list = file_ace_list; ace_list; ace_list = ace_list->next) {
219 uint8_t type_val = (uint8_t)ace_list->owner_type;
220 uint32_t entry_val = get_entry_val(ace_list);
221
222 SCVAL(entry_offset,0,ace_list->ace_flags);
223 SCVAL(entry_offset,1,type_val);
224 SIVAL(entry_offset,2,entry_val);
225 DEBUG(10,("create_pai_buf_v2: entry %u [0x%x] [0x%x] [0x%x]\n",
226 i,
227 (unsigned int)ace_list->ace_flags,
228 (unsigned int)type_val,
229 (unsigned int)entry_val ));
230 i++;
231 entry_offset += PAI_V2_ENTRY_LENGTH;
232 }
233
234 for (ace_list = dir_ace_list; ace_list; ace_list = ace_list->next) {
235 uint8_t type_val = (uint8_t)ace_list->owner_type;
236 uint32_t entry_val = get_entry_val(ace_list);
237
238 SCVAL(entry_offset,0,ace_list->ace_flags);
239 SCVAL(entry_offset,1,type_val);
240 SIVAL(entry_offset,2,entry_val);
241 DEBUG(10,("create_pai_buf_v2: entry %u [0x%x] [0x%x] [0x%x]\n",
242 i,
243 (unsigned int)ace_list->ace_flags,
244 (unsigned int)type_val,
245 (unsigned int)entry_val ));
246 i++;
247 entry_offset += PAI_V2_ENTRY_LENGTH;
248 }
249
250 return pai_buf;
251 }
252
253 /************************************************************************
254 Store the user.SAMBA_PAI attribute on disk.
255 ************************************************************************/
256
257 static void store_inheritance_attributes(files_struct *fsp,
258 canon_ace *file_ace_list,
259 canon_ace *dir_ace_list,
260 uint16_t sd_type)
261 {
262 int ret;
263 size_t store_size;
264 char *pai_buf;
265
266 if (!lp_map_acl_inherit(SNUM(fsp->conn))) {
267 return;
268 }
269
270 pai_buf = create_pai_buf_v2(file_ace_list, dir_ace_list,
271 sd_type, &store_size);
272
273 if (fsp->fh->fd != -1) {
274 ret = SMB_VFS_FSETXATTR(fsp, SAMBA_POSIX_INHERITANCE_EA_NAME,
275 pai_buf, store_size, 0);
276 } else {
277 ret = SMB_VFS_SETXATTR(fsp->conn, fsp->fsp_name->base_name,
278 SAMBA_POSIX_INHERITANCE_EA_NAME,
279 pai_buf, store_size, 0);
280 }
281
282 TALLOC_FREE(pai_buf);
283
284 DEBUG(10,("store_inheritance_attribute: type 0x%x for file %s\n",
285 (unsigned int)sd_type,
286 fsp_str_dbg(fsp)));
287
288 if (ret == -1 && !no_acl_syscall_error(errno)) {
289 DEBUG(1,("store_inheritance_attribute: Error %s\n", strerror(errno) ));
290 }
291 }
292
293 /************************************************************************
294 Delete the in memory inheritance info.
295 ************************************************************************/
296
297 static void free_inherited_info(struct pai_val *pal)
298 {
299 if (pal) {
300 struct pai_entry *paie, *paie_next;
301 for (paie = pal->entry_list; paie; paie = paie_next) {
302 paie_next = paie->next;
303 TALLOC_FREE(paie);
304 }
305 for (paie = pal->def_entry_list; paie; paie = paie_next) {
306 paie_next = paie->next;
307 TALLOC_FREE(paie);
308 }
309 TALLOC_FREE(pal);
310 }
311 }
312
313 /************************************************************************
314 Get any stored ACE flags.
315 ************************************************************************/
316
317 static uint16_t get_pai_flags(struct pai_val *pal, canon_ace *ace_entry, bool default_ace)
318 {
319 struct pai_entry *paie;
320
321 if (!pal) {
322 return 0;
323 }
324
325 /* If the entry exists it is inherited. */
326 for (paie = (default_ace ? pal->def_entry_list : pal->entry_list); paie; paie = paie->next) {
327 if (ace_entry->owner_type == paie->owner_type &&
328 get_entry_val(ace_entry) == get_pai_entry_val(paie))
329 return paie->ace_flags;
330 }
331 return 0;
332 }
333
334 /************************************************************************
335 Ensure an attribute just read is valid - v1.
336 ************************************************************************/
337
338 static bool check_pai_ok_v1(const char *pai_buf, size_t pai_buf_data_size)
339 {
340 uint16 num_entries;
341 uint16 num_def_entries;
342
343 if (pai_buf_data_size < PAI_V1_ENTRIES_BASE) {
344 /* Corrupted - too small. */
345 return false;
346 }
347
348 if (CVAL(pai_buf,PAI_VERSION_OFFSET) != PAI_V1_VERSION) {
349 return false;
350 }
351
352 num_entries = SVAL(pai_buf,PAI_V1_NUM_ENTRIES_OFFSET);
353 num_def_entries = SVAL(pai_buf,PAI_V1_NUM_DEFAULT_ENTRIES_OFFSET);
354
355 /* Check the entry lists match. */
356 /* Each entry is 5 bytes (type plus 4 bytes of uid or gid). */
357
358 if (((num_entries + num_def_entries)*PAI_V1_ENTRY_LENGTH) +
359 PAI_V1_ENTRIES_BASE != pai_buf_data_size) {
360 return false;
361 }
362
363 return true;
364 }
365
366 /************************************************************************
367 Ensure an attribute just read is valid - v2.
368 ************************************************************************/
369
370 static bool check_pai_ok_v2(const char *pai_buf, size_t pai_buf_data_size)
371 {
372 uint16 num_entries;
373 uint16 num_def_entries;
374
375 if (pai_buf_data_size < PAI_V2_ENTRIES_BASE) {
376 /* Corrupted - too small. */
377 return false;
378 }
379
380 if (CVAL(pai_buf,PAI_VERSION_OFFSET) != PAI_V2_VERSION) {
381 return false;
382 }
383
384 num_entries = SVAL(pai_buf,PAI_V2_NUM_ENTRIES_OFFSET);
385 num_def_entries = SVAL(pai_buf,PAI_V2_NUM_DEFAULT_ENTRIES_OFFSET);
386
387 /* Check the entry lists match. */
388 /* Each entry is 6 bytes (flags + type + 4 bytes of uid or gid). */
389
390 if (((num_entries + num_def_entries)*PAI_V2_ENTRY_LENGTH) +
391 PAI_V2_ENTRIES_BASE != pai_buf_data_size) {
392 return false;
393 }
394
395 return true;
396 }
397
398 /************************************************************************
399 Decode the owner.
400 ************************************************************************/
401
402 static bool get_pai_owner_type(struct pai_entry *paie, const char *entry_offset)
403 {
404 paie->owner_type = (enum ace_owner)CVAL(entry_offset,0);
405 switch( paie->owner_type) {
406 case UID_ACE:
407 paie->unix_ug.type = ID_TYPE_UID;
408 paie->unix_ug.id = (uid_t)IVAL(entry_offset,1);
409 DEBUG(10,("get_pai_owner_type: uid = %u\n",
410 (unsigned int)paie->unix_ug.id ));
411 break;
412 case GID_ACE:
413 paie->unix_ug.type = ID_TYPE_GID;
414 paie->unix_ug.id = (gid_t)IVAL(entry_offset,1);
415 DEBUG(10,("get_pai_owner_type: gid = %u\n",
416 (unsigned int)paie->unix_ug.id ));
417 break;
418 case WORLD_ACE:
419 paie->unix_ug.type = ID_TYPE_NOT_SPECIFIED;
420 paie->unix_ug.id = -1;
421 DEBUG(10,("get_pai_owner_type: world ace\n"));
422 break;
423 default:
424 DEBUG(10,("get_pai_owner_type: unknown type %u\n",
425 (unsigned int)paie->owner_type ));
426 return false;
427 }
428 return true;
429 }
430
431 /************************************************************************
432 Process v2 entries.
433 ************************************************************************/
434
435 static const char *create_pai_v1_entries(struct pai_val *paiv,
436 const char *entry_offset,
437 bool def_entry)
438 {
439 int i;
440
441 for (i = 0; i < paiv->num_entries; i++) {
442 struct pai_entry *paie = talloc(talloc_tos(), struct pai_entry);
443 if (!paie) {
444 return NULL;
445 }
446
447 paie->ace_flags = SEC_ACE_FLAG_INHERITED_ACE;
448 if (!get_pai_owner_type(paie, entry_offset)) {
449 TALLOC_FREE(paie);
450 return NULL;
451 }
452
453 if (!def_entry) {
454 DLIST_ADD(paiv->entry_list, paie);
455 } else {
456 DLIST_ADD(paiv->def_entry_list, paie);
457 }
458 entry_offset += PAI_V1_ENTRY_LENGTH;
459 }
460 return entry_offset;
461 }
462
463 /************************************************************************
464 Convert to in-memory format from version 1.
465 ************************************************************************/
466
467 static struct pai_val *create_pai_val_v1(const char *buf, size_t size)
468 {
469 const char *entry_offset;
470 struct pai_val *paiv = NULL;
471
472 if (!check_pai_ok_v1(buf, size)) {
473 return NULL;
474 }
475
476 paiv = talloc(talloc_tos(), struct pai_val);
477 if (!paiv) {
478 return NULL;
479 }
480
481 memset(paiv, '\0', sizeof(struct pai_val));
482
483 paiv->sd_type = (CVAL(buf,PAI_V1_FLAG_OFFSET) == PAI_V1_ACL_FLAG_PROTECTED) ?
484 SEC_DESC_DACL_PROTECTED : 0;
485
486 paiv->num_entries = SVAL(buf,PAI_V1_NUM_ENTRIES_OFFSET);
487 paiv->num_def_entries = SVAL(buf,PAI_V1_NUM_DEFAULT_ENTRIES_OFFSET);
488
489 entry_offset = buf + PAI_V1_ENTRIES_BASE;
490
491 DEBUG(10,("create_pai_val: num_entries = %u, num_def_entries = %u\n",
492 paiv->num_entries, paiv->num_def_entries ));
493
494 entry_offset = create_pai_v1_entries(paiv, entry_offset, false);
495 if (entry_offset == NULL) {
496 free_inherited_info(paiv);
497 return NULL;
498 }
499 entry_offset = create_pai_v1_entries(paiv, entry_offset, true);
500 if (entry_offset == NULL) {
501 free_inherited_info(paiv);
502 return NULL;
503 }
504
505 return paiv;
506 }
507
508 /************************************************************************
509 Process v2 entries.
510 ************************************************************************/
511
512 static const char *create_pai_v2_entries(struct pai_val *paiv,
513 unsigned int num_entries,
514 const char *entry_offset,
515 bool def_entry)
516 {
517 unsigned int i;
518
519 for (i = 0; i < num_entries; i++) {
520 struct pai_entry *paie = talloc(talloc_tos(), struct pai_entry);
521 if (!paie) {
522 return NULL;
523 }
524
525 paie->ace_flags = CVAL(entry_offset,0);
526
527 if (!get_pai_owner_type(paie, entry_offset+1)) {
528 TALLOC_FREE(paie);
529 return NULL;
530 }
531 if (!def_entry) {
532 DLIST_ADD(paiv->entry_list, paie);
533 } else {
534 DLIST_ADD(paiv->def_entry_list, paie);
535 }
536 entry_offset += PAI_V2_ENTRY_LENGTH;
537 }
538 return entry_offset;
539 }
540
541 /************************************************************************
542 Convert to in-memory format from version 2.
543 ************************************************************************/
544
545 static struct pai_val *create_pai_val_v2(const char *buf, size_t size)
546 {
547 const char *entry_offset;
548 struct pai_val *paiv = NULL;
549
550 if (!check_pai_ok_v2(buf, size)) {
551 return NULL;
552 }
553
554 paiv = talloc(talloc_tos(), struct pai_val);
555 if (!paiv) {
556 return NULL;
557 }
558
559 memset(paiv, '\0', sizeof(struct pai_val));
560
561 paiv->sd_type = SVAL(buf,PAI_V2_TYPE_OFFSET);
562
563 paiv->num_entries = SVAL(buf,PAI_V2_NUM_ENTRIES_OFFSET);
564 paiv->num_def_entries = SVAL(buf,PAI_V2_NUM_DEFAULT_ENTRIES_OFFSET);
565
566 entry_offset = buf + PAI_V2_ENTRIES_BASE;
567
568 DEBUG(10,("create_pai_val_v2: sd_type = 0x%x num_entries = %u, num_def_entries = %u\n",
569 (unsigned int)paiv->sd_type,
570 paiv->num_entries, paiv->num_def_entries ));
571
572 entry_offset = create_pai_v2_entries(paiv, paiv->num_entries,
573 entry_offset, false);
574 if (entry_offset == NULL) {
575 free_inherited_info(paiv);
576 return NULL;
577 }
578 entry_offset = create_pai_v2_entries(paiv, paiv->num_def_entries,
579 entry_offset, true);
580 if (entry_offset == NULL) {
581 free_inherited_info(paiv);
582 return NULL;
583 }
584
585 return paiv;
586 }
587
588 /************************************************************************
589 Convert to in-memory format - from either version 1 or 2.
590 ************************************************************************/
591
592 static struct pai_val *create_pai_val(const char *buf, size_t size)
593 {
594 if (size < 1) {
595 return NULL;
596 }
597 if (CVAL(buf,PAI_VERSION_OFFSET) == PAI_V1_VERSION) {
598 return create_pai_val_v1(buf, size);
599 } else if (CVAL(buf,PAI_VERSION_OFFSET) == PAI_V2_VERSION) {
600 return create_pai_val_v2(buf, size);
601 } else {
602 return NULL;
603 }
604 }
605
606 /************************************************************************
607 Load the user.SAMBA_PAI attribute.
608 ************************************************************************/
609
610 static struct pai_val *fload_inherited_info(files_struct *fsp)
611 {
612 char *pai_buf;
613 size_t pai_buf_size = 1024;
614 struct pai_val *paiv = NULL;
615 ssize_t ret;
616
617 if (!lp_map_acl_inherit(SNUM(fsp->conn))) {
618 return NULL;
619 }
620
621 if ((pai_buf = talloc_array(talloc_tos(), char, pai_buf_size)) == NULL) {
622 return NULL;
623 }
624
625 do {
626 if (fsp->fh->fd != -1) {
627 ret = SMB_VFS_FGETXATTR(fsp, SAMBA_POSIX_INHERITANCE_EA_NAME,
628 pai_buf, pai_buf_size);
629 } else {
630 ret = SMB_VFS_GETXATTR(fsp->conn,
631 fsp->fsp_name->base_name,
632 SAMBA_POSIX_INHERITANCE_EA_NAME,
633 pai_buf, pai_buf_size);
634 }
635
636 if (ret == -1) {
637 if (errno != ERANGE) {
638 break;
639 }
640 /* Buffer too small - enlarge it. */
641 pai_buf_size *= 2;
642 TALLOC_FREE(pai_buf);
643 if (pai_buf_size > 1024*1024) {
644 return NULL; /* Limit malloc to 1mb. */
645 }
646 if ((pai_buf = talloc_array(talloc_tos(), char, pai_buf_size)) == NULL)
647 return NULL;
648 }
649 } while (ret == -1);
650
651 DEBUG(10,("load_inherited_info: ret = %lu for file %s\n",
652 (unsigned long)ret, fsp_str_dbg(fsp)));
653
654 if (ret == -1) {
655 /* No attribute or not supported. */
656 #if defined(ENOATTR)
657 if (errno != ENOATTR)
658 DEBUG(10,("load_inherited_info: Error %s\n", strerror(errno) ));
659 #else
660 if (errno != ENOSYS)
661 DEBUG(10,("load_inherited_info: Error %s\n", strerror(errno) ));
662 #endif
663 TALLOC_FREE(pai_buf);
664 return NULL;
665 }
666
667 paiv = create_pai_val(pai_buf, ret);
668
669 if (paiv) {
670 DEBUG(10,("load_inherited_info: ACL type is 0x%x for file %s\n",
671 (unsigned int)paiv->sd_type, fsp_str_dbg(fsp)));
672 }
673
674 TALLOC_FREE(pai_buf);
675 return paiv;
676 }
677
678 /************************************************************************
679 Load the user.SAMBA_PAI attribute.
680 ************************************************************************/
681
682 static struct pai_val *load_inherited_info(const struct connection_struct *conn,
683 const char *fname)
684 {
685 char *pai_buf;
686 size_t pai_buf_size = 1024;
687 struct pai_val *paiv = NULL;
688 ssize_t ret;
689
690 if (!lp_map_acl_inherit(SNUM(conn))) {
691 return NULL;
692 }
693
694 if ((pai_buf = talloc_array(talloc_tos(), char, pai_buf_size)) == NULL) {
695 return NULL;
696 }
697
698 do {
699 ret = SMB_VFS_GETXATTR(conn, fname,
700 SAMBA_POSIX_INHERITANCE_EA_NAME,
701 pai_buf, pai_buf_size);
702
703 if (ret == -1) {
704 if (errno != ERANGE) {
705 break;
706 }
707 /* Buffer too small - enlarge it. */
708 pai_buf_size *= 2;
709 TALLOC_FREE(pai_buf);
710 if (pai_buf_size > 1024*1024) {
711 return NULL; /* Limit malloc to 1mb. */
712 }
713 if ((pai_buf = talloc_array(talloc_tos(), char, pai_buf_size)) == NULL)
714 return NULL;
715 }
716 } while (ret == -1);
717
718 DEBUG(10,("load_inherited_info: ret = %lu for file %s\n", (unsigned long)ret, fname));
719
720 if (ret == -1) {
721 /* No attribute or not supported. */
722 #if defined(ENOATTR)
723 if (errno != ENOATTR)
724 DEBUG(10,("load_inherited_info: Error %s\n", strerror(errno) ));
725 #else
726 if (errno != ENOSYS)
727 DEBUG(10,("load_inherited_info: Error %s\n", strerror(errno) ));
728 #endif
729 TALLOC_FREE(pai_buf);
730 return NULL;
731 }
732
733 paiv = create_pai_val(pai_buf, ret);
734
735 if (paiv) {
736 DEBUG(10,("load_inherited_info: ACL type 0x%x for file %s\n",
737 (unsigned int)paiv->sd_type,
738 fname));
739 }
740
741 TALLOC_FREE(pai_buf);
742 return paiv;
743 }
744
745 /****************************************************************************
746 Functions to manipulate the internal ACE format.
747 ****************************************************************************/
748
749 /****************************************************************************
750 Count a linked list of canonical ACE entries.
751 ****************************************************************************/
752
753 static size_t count_canon_ace_list( canon_ace *l_head )
754 {
755 size_t count = 0;
756 canon_ace *ace;
757
758 for (ace = l_head; ace; ace = ace->next)
759 count++;
760
761 return count;
762 }
763
764 /****************************************************************************
765 Free a linked list of canonical ACE entries.
766 ****************************************************************************/
767
768 static void free_canon_ace_list( canon_ace *l_head )
769 {
770 canon_ace *list, *next;
771
772 for (list = l_head; list; list = next) {
773 next = list->next;
774 DLIST_REMOVE(l_head, list);
775 TALLOC_FREE(list);
776 }
777 }
778
779 /****************************************************************************
780 Function to duplicate a canon_ace entry.
781 ****************************************************************************/
782
783 static canon_ace *dup_canon_ace( canon_ace *src_ace)
784 {
785 canon_ace *dst_ace = talloc(talloc_tos(), canon_ace);
786
787 if (dst_ace == NULL)
788 return NULL;
789
790 *dst_ace = *src_ace;
791 dst_ace->prev = dst_ace->next = NULL;
792 return dst_ace;
793 }
794
795 /****************************************************************************
796 Print out a canon ace.
797 ****************************************************************************/
798
799 static void print_canon_ace(canon_ace *pace, int num)
800 {
801 dbgtext( "canon_ace index %d. Type = %s ", num, pace->attr == ALLOW_ACE ? "allow" : "deny" );
802 dbgtext( "SID = %s ", sid_string_dbg(&pace->trustee));
803 if (pace->owner_type == UID_ACE) {
804 const char *u_name = uidtoname(pace->unix_ug.id);
805 dbgtext( "uid %u (%s) ", (unsigned int)pace->unix_ug.id, u_name );
806 } else if (pace->owner_type == GID_ACE) {
807 char *g_name = gidtoname(pace->unix_ug.id);
808 dbgtext( "gid %u (%s) ", (unsigned int)pace->unix_ug.id, g_name );
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 void create_file_sids(const SMB_STRUCT_STAT *psbuf, struct dom_sid *powner_sid, struct dom_sid *pgroup_sid)
916 {
917 uid_to_sid( powner_sid, psbuf->st_ex_uid );
918 gid_to_sid( pgroup_sid, psbuf->st_ex_gid );
919 }
920
921 /****************************************************************************
922 Merge aces with a common UID or GID - if both are allow or deny, OR the permissions together and
923 delete the second one. If the first is deny, mask the permissions off and delete the allow
924 if the permissions become zero, delete the deny if the permissions are non zero.
925 ****************************************************************************/
926
927 static void merge_aces( canon_ace **pp_list_head, bool dir_acl)
928 {
929 canon_ace *l_head = *pp_list_head;
930 canon_ace *curr_ace_outer;
931 canon_ace *curr_ace_outer_next;
932
933 /*
934 * First, merge allow entries with identical SIDs, and deny entries
935 * with identical SIDs.
936 */
937
938 for (curr_ace_outer = l_head; curr_ace_outer; curr_ace_outer = curr_ace_outer_next) {
939 canon_ace *curr_ace;
940 canon_ace *curr_ace_next;
941
942 curr_ace_outer_next = curr_ace_outer->next; /* Save the link in case we delete. */
943
944 for (curr_ace = curr_ace_outer->next; curr_ace; curr_ace = curr_ace_next) {
945 bool can_merge = false;
946
947 curr_ace_next = curr_ace->next; /* Save the link in case of delete. */
948
949 /* For file ACLs we can merge if the SIDs and ALLOW/DENY
950 * types are the same. For directory acls we must also
951 * ensure the POSIX ACL types are the same.
952 *
953 * For the IDMAP_BOTH case, we must not merge
954 * the UID and GID ACE values for same SID
955 */
956
957 if (!dir_acl) {
958 can_merge = (curr_ace->unix_ug.id == curr_ace_outer->unix_ug.id &&
959 curr_ace->owner_type == curr_ace_outer->owner_type &&
960 (curr_ace->attr == curr_ace_outer->attr));
961 } else {
962 can_merge = (curr_ace->unix_ug.id == curr_ace_outer->unix_ug.id &&
963 curr_ace->owner_type == curr_ace_outer->owner_type &&
964 (curr_ace->type == curr_ace_outer->type) &&
965 (curr_ace->attr == curr_ace_outer->attr));
966 }
967
968 if (can_merge) {
969 if( DEBUGLVL( 10 )) {
970 dbgtext("merge_aces: Merging ACE's\n");
971 print_canon_ace( curr_ace_outer, 0);
972 print_canon_ace( curr_ace, 0);
973 }
974
975 /* Merge two allow or two deny ACE's. */
976
977 /* Theoretically we shouldn't merge a dir ACE if
978 * one ACE has the CI flag set, and the other
979 * ACE has the OI flag set, but this is rare
980 * enough we can ignore it. */
981
982 curr_ace_outer->perms |= curr_ace->perms;
983 curr_ace_outer->ace_flags |= curr_ace->ace_flags;
984 DLIST_REMOVE(l_head, curr_ace);
985 TALLOC_FREE(curr_ace);
986 curr_ace_outer_next = curr_ace_outer->next; /* We may have deleted the link. */
987 }
988 }
989 }
990
991 /*
992 * Now go through and mask off allow permissions with deny permissions.
993 * We can delete either the allow or deny here as we know that each SID
994 * appears only once in the list.
995 */
996
997 for (curr_ace_outer = l_head; curr_ace_outer; curr_ace_outer = curr_ace_outer_next) {
998 canon_ace *curr_ace;
999 canon_ace *curr_ace_next;
1000
1001 curr_ace_outer_next = curr_ace_outer->next; /* Save the link in case we delete. */
1002
1003 for (curr_ace = curr_ace_outer->next; curr_ace; curr_ace = curr_ace_next) {
1004
1005 curr_ace_next = curr_ace->next; /* Save the link in case of delete. */
1006
1007 /*
1008 * Subtract ACE's with different entries. Due to the ordering constraints
1009 * we've put on the ACL, we know the deny must be the first one.
1010 */
1011
1012 if (curr_ace->unix_ug.id == curr_ace_outer->unix_ug.id &&
1013 (curr_ace->owner_type == curr_ace_outer->owner_type) &&
1014 (curr_ace_outer->attr == DENY_ACE) && (curr_ace->attr == ALLOW_ACE)) {
1015
1016 if( DEBUGLVL( 10 )) {
1017 dbgtext("merge_aces: Masking ACE's\n");
1018 print_canon_ace( curr_ace_outer, 0);
1019 print_canon_ace( curr_ace, 0);
1020 }
1021
1022 curr_ace->perms &= ~curr_ace_outer->perms;
1023
1024 if (curr_ace->perms == 0) {
1025
1026 /*
1027 * The deny overrides the allow. Remove the allow.
1028 */
1029
1030 DLIST_REMOVE(l_head, curr_ace);
1031 TALLOC_FREE(curr_ace);
1032 curr_ace_outer_next = curr_ace_outer->next; /* We may have deleted the link. */
1033
1034 } else {
1035
1036 /*
1037 * Even after removing permissions, there
1038 * are still allow permissions - delete the deny.
1039 * It is safe to delete the deny here,
1040 * as we are guarenteed by the deny first
1041 * ordering that all the deny entries for
1042 * this SID have already been merged into one
1043 * before we can get to an allow ace.
1044 */
1045
1046 DLIST_REMOVE(l_head, curr_ace_outer);
1047 TALLOC_FREE(curr_ace_outer);
1048 break;
1049 }
1050 }
1051
1052 } /* end for curr_ace */
1053 } /* end for curr_ace_outer */
1054
1055 /* We may have modified the list. */
1056
1057 *pp_list_head = l_head;
1058 }
1059
1060 /****************************************************************************
1061 Check if we need to return NT4.x compatible ACL entries.
1062 ****************************************************************************/
1063
1064 bool nt4_compatible_acls(void)
1065 {
1066 int compat = lp_acl_compatibility();
1067
1068 if (compat == ACL_COMPAT_AUTO) {
1069 enum remote_arch_types ra_type = get_remote_arch();
1070
1071 /* Automatically adapt to client */
1072 return (ra_type <= RA_WINNT);
1073 } else
1074 return (compat == ACL_COMPAT_WINNT);
1075 }
1076
1077
1078 /****************************************************************************
1079 Map canon_ace perms to permission bits NT.
1080 The attr element is not used here - we only process deny entries on set,
1081 not get. Deny entries are implicit on get with ace->perms = 0.
1082 ****************************************************************************/
1083
1084 uint32_t map_canon_ace_perms(int snum,
1085 enum security_ace_type *pacl_type,
1086 mode_t perms,
1087 bool directory_ace)
1088 {
1089 uint32_t nt_mask = 0;
1090
1091 *pacl_type = SEC_ACE_TYPE_ACCESS_ALLOWED;
1092
1093 if (lp_acl_map_full_control(snum) && ((perms & ALL_ACE_PERMS) == ALL_ACE_PERMS)) {
1094 if (directory_ace) {
1095 nt_mask = UNIX_DIRECTORY_ACCESS_RWX;
1096 } else {
1097 nt_mask = (UNIX_ACCESS_RWX & ~DELETE_ACCESS);
1098 }
1099 } else if ((perms & ALL_ACE_PERMS) == (mode_t)0) {
1100 /*
1101 * Windows NT refuses to display ACEs with no permissions in them (but
1102 * they are perfectly legal with Windows 2000). If the ACE has empty
1103 * permissions we cannot use 0, so we use the otherwise unused
1104 * WRITE_OWNER permission, which we ignore when we set an ACL.
1105 * We abstract this into a #define of UNIX_ACCESS_NONE to allow this
1106 * to be changed in the future.
1107 */
1108
1109 if (nt4_compatible_acls())
1110 nt_mask = UNIX_ACCESS_NONE;
1111 else
1112 nt_mask = 0;
1113 } else {
1114 if (directory_ace) {
1115 nt_mask |= ((perms & S_IRUSR) ? UNIX_DIRECTORY_ACCESS_R : 0 );
1116 nt_mask |= ((perms & S_IWUSR) ? UNIX_DIRECTORY_ACCESS_W : 0 );
1117 nt_mask |= ((perms & S_IXUSR) ? UNIX_DIRECTORY_ACCESS_X : 0 );
1118 } else {
1119 nt_mask |= ((perms & S_IRUSR) ? UNIX_ACCESS_R : 0 );
1120 nt_mask |= ((perms & S_IWUSR) ? UNIX_ACCESS_W : 0 );
1121 nt_mask |= ((perms & S_IXUSR) ? UNIX_ACCESS_X : 0 );
1122 }
1123 }
1124
1125 if ((perms & S_IWUSR) && lp_dos_filemode(snum)) {
1126 nt_mask |= (SEC_STD_WRITE_DAC|SEC_STD_WRITE_OWNER|DELETE_ACCESS);
1127 }
1128
1129 DEBUG(10,("map_canon_ace_perms: Mapped (UNIX) %x to (NT) %x\n",
1130 (unsigned int)perms, (unsigned int)nt_mask ));
1131
1132 return nt_mask;
1133 }
1134
1135 /****************************************************************************
1136 Map NT perms to a UNIX mode_t.
1137 ****************************************************************************/
1138
1139 #define FILE_SPECIFIC_READ_BITS (FILE_READ_DATA|FILE_READ_EA)
1140 #define FILE_SPECIFIC_WRITE_BITS (FILE_WRITE_DATA|FILE_APPEND_DATA|FILE_WRITE_EA)
1141 #define FILE_SPECIFIC_EXECUTE_BITS (FILE_EXECUTE)
1142
1143 static mode_t map_nt_perms( uint32 *mask, int type)
1144 {
1145 mode_t mode = 0;
1146
1147 switch(type) {
1148 case S_IRUSR:
1149 if((*mask) & GENERIC_ALL_ACCESS)
1150 mode = S_IRUSR|S_IWUSR|S_IXUSR;
1151 else {
1152 mode |= ((*mask) & (GENERIC_READ_ACCESS|FILE_SPECIFIC_READ_BITS)) ? S_IRUSR : 0;
1153 mode |= ((*mask) & (GENERIC_WRITE_ACCESS|FILE_SPECIFIC_WRITE_BITS)) ? S_IWUSR : 0;
1154 mode |= ((*mask) & (GENERIC_EXECUTE_ACCESS|FILE_SPECIFIC_EXECUTE_BITS)) ? S_IXUSR : 0;
1155 }
1156 break;
1157 case S_IRGRP:
1158 if((*mask) & GENERIC_ALL_ACCESS)
1159 mode = S_IRGRP|S_IWGRP|S_IXGRP;
1160 else {
1161 mode |= ((*mask) & (GENERIC_READ_ACCESS|FILE_SPECIFIC_READ_BITS)) ? S_IRGRP : 0;
1162 mode |= ((*mask) & (GENERIC_WRITE_ACCESS|FILE_SPECIFIC_WRITE_BITS)) ? S_IWGRP : 0;
1163 mode |= ((*mask) & (GENERIC_EXECUTE_ACCESS|FILE_SPECIFIC_EXECUTE_BITS)) ? S_IXGRP : 0;
1164 }
1165 break;
1166 case S_IROTH:
1167 if((*mask) & GENERIC_ALL_ACCESS)
1168 mode = S_IROTH|S_IWOTH|S_IXOTH;
1169 else {
1170 mode |= ((*mask) & (GENERIC_READ_ACCESS|FILE_SPECIFIC_READ_BITS)) ? S_IROTH : 0;
1171 mode |= ((*mask) & (GENERIC_WRITE_ACCESS|FILE_SPECIFIC_WRITE_BITS)) ? S_IWOTH : 0;
1172 mode |= ((*mask) & (GENERIC_EXECUTE_ACCESS|FILE_SPECIFIC_EXECUTE_BITS)) ? S_IXOTH : 0;
1173 }
1174 break;
1175 }
1176
1177 return mode;
1178 }
1179
1180 /****************************************************************************
1181 Unpack a struct security_descriptor into a UNIX owner and group.
1182 ****************************************************************************/
1183
1184 NTSTATUS unpack_nt_owners(struct connection_struct *conn,
1185 uid_t *puser, gid_t *pgrp,
1186 uint32 security_info_sent, const struct
1187 security_descriptor *psd)
1188 {
1189 struct dom_sid owner_sid;
1190 struct dom_sid grp_sid;
1191
1192 *puser = (uid_t)-1;
1193 *pgrp = (gid_t)-1;
1194
1195 if(security_info_sent == 0) {
1196 DEBUG(0,("unpack_nt_owners: no security info sent !\n"));
1197 return NT_STATUS_OK;
1198 }
1199
1200 /*
1201 * Validate the owner and group SID's.
1202 */
1203
1204 memset(&owner_sid, '\0', sizeof(owner_sid));
1205 memset(&grp_sid, '\0', sizeof(grp_sid));
1206
1207 DEBUG(5,("unpack_nt_owners: validating owner_sids.\n"));
1208
1209 /*
1210 * Don't immediately fail if the owner sid cannot be validated.
1211 * This may be a group chown only set.
1212 */
1213
1214 if (security_info_sent & SECINFO_OWNER) {
1215 sid_copy(&owner_sid, psd->owner_sid);
1216 if (!sid_to_uid(&owner_sid, puser)) {
1217 if (lp_force_unknown_acl_user(SNUM(conn))) {
1218 /* this allows take ownership to work
1219 * reasonably */
1220 *puser = get_current_uid(conn);
1221 } else {
1222 DEBUG(3,("unpack_nt_owners: unable to validate"
1223 " owner sid for %s\n",
1224 sid_string_dbg(&owner_sid)));
1225 return NT_STATUS_INVALID_OWNER;
1226 }
1227 }
1228 DEBUG(3,("unpack_nt_owners: owner sid mapped to uid %u\n",
1229 (unsigned int)*puser ));
1230 }
1231
1232 /*
1233 * Don't immediately fail if the group sid cannot be validated.
1234 * This may be an owner chown only set.
1235 */
1236
1237 if (security_info_sent & SECINFO_GROUP) {
1238 sid_copy(&grp_sid, psd->group_sid);
1239 if (!sid_to_gid( &grp_sid, pgrp)) {
1240 if (lp_force_unknown_acl_user(SNUM(conn))) {
1241 /* this allows take group ownership to work
1242 * reasonably */
1243 *pgrp = get_current_gid(conn);
1244 } else {
1245 DEBUG(3,("unpack_nt_owners: unable to validate"
1246 " group sid.\n"));
1247 return NT_STATUS_INVALID_OWNER;
1248 }
1249 }
1250 DEBUG(3,("unpack_nt_owners: group sid mapped to gid %u\n",
1251 (unsigned int)*pgrp));
1252 }
1253
1254 DEBUG(5,("unpack_nt_owners: owner_sids validated.\n"));
1255
1256 return NT_STATUS_OK;
1257 }
1258
1259 /****************************************************************************
1260 Ensure the enforced permissions for this share apply.
1261 ****************************************************************************/
1262
1263 static void apply_default_perms(const struct share_params *params,
1264 const bool is_directory, canon_ace *pace,
1265 mode_t type)
1266 {
1267 mode_t and_bits = (mode_t)0;
1268 mode_t or_bits = (mode_t)0;
1269
1270 /* Get the initial bits to apply. */
1271
1272 if (is_directory) {
1273 and_bits = lp_dir_security_mask(params->service);
1274 or_bits = lp_force_dir_security_mode(params->service);
1275 } else {
1276 and_bits = lp_security_mask(params->service);
1277 or_bits = lp_force_security_mode(params->service);
1278 }
1279
1280 /* Now bounce them into the S_USR space. */
1281 switch(type) {
1282 case S_IRUSR:
1283 /* Ensure owner has read access. */
1284 pace->perms |= S_IRUSR;
1285 if (is_directory)
1286 pace->perms |= (S_IWUSR|S_IXUSR);
1287 and_bits = unix_perms_to_acl_perms(and_bits, S_IRUSR, S_IWUSR, S_IXUSR);
1288 or_bits = unix_perms_to_acl_perms(or_bits, S_IRUSR, S_IWUSR, S_IXUSR);
1289 break;
1290 case S_IRGRP:
1291 and_bits = unix_perms_to_acl_perms(and_bits, S_IRGRP, S_IWGRP, S_IXGRP);
1292 or_bits = unix_perms_to_acl_perms(or_bits, S_IRGRP, S_IWGRP, S_IXGRP);
1293 break;
1294 case S_IROTH:
1295 and_bits = unix_perms_to_acl_perms(and_bits, S_IROTH, S_IWOTH, S_IXOTH);
1296 or_bits = unix_perms_to_acl_perms(or_bits, S_IROTH, S_IWOTH, S_IXOTH);
1297 break;
1298 }
1299
1300 pace->perms = ((pace->perms & and_bits)|or_bits);
1301 }
1302
1303 /****************************************************************************
1304 Check if a given uid/SID is in a group gid/SID. This is probably very
1305 expensive and will need optimisation. A *lot* of optimisation :-). JRA.
1306 ****************************************************************************/
1307
1308 static bool uid_entry_in_group(connection_struct *conn, canon_ace *uid_ace, canon_ace *group_ace )
1309 {
1310 /* "Everyone" always matches every uid. */
1311
1312 if (dom_sid_equal(&group_ace->trustee, &global_sid_World))
1313 return True;
1314
1315 /*
1316 * if it's the current user, we already have the unix token
1317 * and don't need to do the complex user_in_group_sid() call
1318 */
1319 if (uid_ace->unix_ug.id == get_current_uid(conn)) {
1320 const struct security_unix_token *curr_utok = NULL;
1321 size_t i;
1322
1323 if (group_ace->unix_ug.id == get_current_gid(conn)) {
1324 return True;
1325 }
1326
1327 curr_utok = get_current_utok(conn);
1328 for (i=0; i < curr_utok->ngroups; i++) {
1329 if (group_ace->unix_ug.id == curr_utok->groups[i]) {
1330 return True;
1331 }
1332 }
1333 }
1334
1335 /*
1336 * user_in_group_sid() uses create_token_from_sid()
1337 * which creates an artificial NT token given just a username,
1338 * so this is not reliable for users from foreign domains
1339 * exported by winbindd!
1340 */
1341 return user_sid_in_group_sid(&uid_ace->trustee, &group_ace->trustee);
1342 }
1343
1344 /****************************************************************************
1345 A well formed POSIX file or default ACL has at least 3 entries, a
1346 SMB_ACL_USER_OBJ, SMB_ACL_GROUP_OBJ, SMB_ACL_OTHER_OBJ.
1347 In addition, the owner must always have at least read access.
1348 When using this call on get_acl, the pst struct is valid and contains
1349 the mode of the file. When using this call on set_acl, the pst struct has
1350 been modified to have a mode containing the default for this file or directory
1351 type.
1352 ****************************************************************************/
1353
1354 static bool ensure_canon_entry_valid(connection_struct *conn,
1355 canon_ace **pp_ace,
1356 const struct share_params *params,
1357 const bool is_directory,
1358 const struct dom_sid *pfile_owner_sid,
1359 const struct dom_sid *pfile_grp_sid,
1360 const SMB_STRUCT_STAT *pst,
1361 bool setting_acl)
1362 {
1363 canon_ace *pace;
1364 canon_ace *pace_user = NULL;
1365 canon_ace *pace_group = NULL;
1366 canon_ace *pace_other = NULL;
1367
1368 for (pace = *pp_ace; pace; pace = pace->next) {
1369 if (pace->type == SMB_ACL_USER_OBJ) {
1370
1371 if (setting_acl)
1372 apply_default_perms(params, is_directory, pace, S_IRUSR);
1373 pace_user = pace;
1374
1375 } else if (pace->type == SMB_ACL_GROUP_OBJ) {
1376
1377 /*
1378 * Ensure create mask/force create mode is respected on set.
1379 */
1380
1381 if (setting_acl)
1382 apply_default_perms(params, is_directory, pace, S_IRGRP);
1383 pace_group = pace;
1384
1385 } else if (pace->type == SMB_ACL_OTHER) {
1386
1387 /*
1388 * Ensure create mask/force create mode is respected on set.
1389 */
1390
1391 if (setting_acl)
1392 apply_default_perms(params, is_directory, pace, S_IROTH);
1393 pace_other = pace;
1394 }
1395 }
1396
1397 if (!pace_user) {
1398 if ((pace = talloc(talloc_tos(), canon_ace)) == NULL) {
1399 DEBUG(0,("ensure_canon_entry_valid: malloc fail.\n"));
1400 return False;
1401 }
1402
1403 ZERO_STRUCTP(pace);
1404 pace->type = SMB_ACL_USER_OBJ;
1405 pace->owner_type = UID_ACE;
1406 pace->unix_ug.type = ID_TYPE_UID;
1407 pace->unix_ug.id = pst->st_ex_uid;
1408 pace->trustee = *pfile_owner_sid;
1409 pace->attr = ALLOW_ACE;
1410 /* Start with existing permissions, principle of least
1411 surprises for the user. */
1412 pace->perms = pst->st_ex_mode;
1413
1414 if (setting_acl) {
1415 /* See if the owning user is in any of the other groups in
1416 the ACE, or if there's a matching user entry (by uid
1417 or in the case of ID_TYPE_BOTH by SID).
1418 If so, OR in the permissions from that entry. */
1419
1420 canon_ace *pace_iter;
1421
1422 for (pace_iter = *pp_ace; pace_iter; pace_iter = pace_iter->next) {
1423 if (pace_iter->type == SMB_ACL_USER &&
1424 pace_iter->unix_ug.id == pace->unix_ug.id) {
1425 pace->perms |= pace_iter->perms;
1426 } else if (pace_iter->type == SMB_ACL_GROUP_OBJ || pace_iter->type == SMB_ACL_GROUP) {
1427 if (dom_sid_equal(&pace->trustee, &pace_iter->trustee)) {
1428 pace->perms |= pace_iter->perms;
1429 } else if (uid_entry_in_group(conn, pace, pace_iter)) {
1430 pace->perms |= pace_iter->perms;
1431 }
1432 }
1433 }
1434
1435 if (pace->perms == 0) {
1436 /* If we only got an "everyone" perm, just use that. */
1437 if (pace_other)
1438 pace->perms = pace_other->perms;
1439 }
1440
1441 apply_default_perms(params, is_directory, pace, S_IRUSR);
1442 } else {
1443 pace->perms = unix_perms_to_acl_perms(pst->st_ex_mode, S_IRUSR, S_IWUSR, S_IXUSR);
1444 }
1445
1446 DLIST_ADD(*pp_ace, pace);
1447 pace_user = pace;
1448 }
1449
1450 if (!pace_group) {
1451 if ((pace = talloc(talloc_tos(), canon_ace)) == NULL) {
1452 DEBUG(0,("ensure_canon_entry_valid: malloc fail.\n"));
1453 return False;
1454 }
1455
1456 ZERO_STRUCTP(pace);
1457 pace->type = SMB_ACL_GROUP_OBJ;
1458 pace->owner_type = GID_ACE;
1459 pace->unix_ug.type = ID_TYPE_GID;
1460 pace->unix_ug.id = pst->st_ex_gid;
1461 pace->trustee = *pfile_grp_sid;
1462 pace->attr = ALLOW_ACE;
1463 if (setting_acl) {
1464 /* If we only got an "everyone" perm, just use that. */
1465 if (pace_other)
1466 pace->perms = pace_other->perms;
1467 else
1468 pace->perms = 0;
1469 apply_default_perms(params, is_directory, pace, S_IRGRP);
1470 } else {
1471 pace->perms = unix_perms_to_acl_perms(pst->st_ex_mode, S_IRGRP, S_IWGRP, S_IXGRP);
1472 }
1473
1474 DLIST_ADD(*pp_ace, pace);
1475 pace_group = pace;
1476 }
1477
1478 if (!pace_other) {
1479 if ((pace = talloc(talloc_tos(), canon_ace)) == NULL) {
1480 DEBUG(0,("ensure_canon_entry_valid: malloc fail.\n"));
1481 return False;
1482 }
1483
1484 ZERO_STRUCTP(pace);
1485 pace->type = SMB_ACL_OTHER;
1486 pace->owner_type = WORLD_ACE;
1487 pace->unix_ug.type = ID_TYPE_NOT_SPECIFIED;
1488 pace->unix_ug.id = -1;
1489 pace->trustee = global_sid_World;
1490 pace->attr = ALLOW_ACE;
1491 if (setting_acl) {
1492 pace->perms = 0;
1493 apply_default_perms(params, is_directory, pace, S_IROTH);
1494 } else
1495 pace->perms = unix_perms_to_acl_perms(pst->st_ex_mode, S_IROTH, S_IWOTH, S_IXOTH);
1496
1497 DLIST_ADD(*pp_ace, pace);
1498 pace_other = pace;
1499 }
1500
1501 if (setting_acl) {
1502 /* Ensure when setting a POSIX ACL, that the uid for a
1503 SMB_ACL_USER_OBJ ACE (the owner ACE entry) has a duplicate
1504 permission entry as an SMB_ACL_USER, and a gid for a
1505 SMB_ACL_GROUP_OBJ ACE (the primary group ACE entry) also has
1506 a duplicate permission entry as an SMB_ACL_GROUP. If not,
1507 then if the ownership or group ownership of this file or
1508 directory gets changed, the user or group can lose their
1509 access. */
1510 bool got_duplicate_user = false;
1511 bool got_duplicate_group = false;
1512
1513 for (pace = *pp_ace; pace; pace = pace->next) {
1514 if (pace->type == SMB_ACL_USER &&
1515 pace->unix_ug.id == pace_user->unix_ug.id) {
1516 /* Already got one. */
1517 got_duplicate_user = true;
1518 } else if (pace->type == SMB_ACL_GROUP &&
1519 pace->unix_ug.id == pace_user->unix_ug.id) {
1520 /* Already got one. */
1521 got_duplicate_group = true;
1522 } else if ((pace->type == SMB_ACL_GROUP)
1523 && (dom_sid_equal(&pace->trustee, &pace_user->trustee))) {
1524 /* If the SID owning the file appears
1525 * in a group entry, then we have
1526 * enough duplication, they will still
1527 * have access */
1528 got_duplicate_user = true;
1529 }
1530 }
1531
1532 /* If the SID is equal for the user and group that we need
1533 to add the duplicate for, add only the group */
1534 if (!got_duplicate_user && !got_duplicate_group
1535 && dom_sid_equal(&pace_group->trustee,
1536 &pace_user->trustee)) {
1537 /* Add a duplicate SMB_ACL_GROUP entry, this
1538 * will cover the owning SID as well, as it
1539 * will always be mapped to both a uid and
1540 * gid. */
1541
1542 if ((pace = talloc(talloc_tos(), canon_ace)) == NULL) {
1543 DEBUG(0,("ensure_canon_entry_valid: talloc fail.\n"));
1544 return false;
1545 }
1546
1547 ZERO_STRUCTP(pace);
1548 pace->type = SMB_ACL_GROUP;;
1549 pace->owner_type = GID_ACE;
1550 pace->unix_ug.type = ID_TYPE_GID;
1551 pace->unix_ug.id = pace_group->unix_ug.id;
1552 pace->trustee = pace_group->trustee;
1553 pace->attr = pace_group->attr;
1554 pace->perms = pace_group->perms;
1555
1556 DLIST_ADD(*pp_ace, pace);
1557
1558 /* We're done here, make sure the
1559 statements below are not executed. */
1560 got_duplicate_user = true;
1561 got_duplicate_group = true;
1562 }
1563
1564 if (!got_duplicate_user) {
1565 /* Add a duplicate SMB_ACL_USER entry. */
1566 if ((pace = talloc(talloc_tos(), canon_ace)) == NULL) {
1567 DEBUG(0,("ensure_canon_entry_valid: talloc fail.\n"));
1568 return false;
1569 }
1570
1571 ZERO_STRUCTP(pace);
1572 pace->type = SMB_ACL_USER;;
1573 pace->owner_type = UID_ACE;
1574 pace->unix_ug.type = ID_TYPE_UID;
1575 pace->unix_ug.id = pace_user->unix_ug.id;
1576 pace->trustee = pace_user->trustee;
1577 pace->attr = pace_user->attr;
1578 pace->perms = pace_user->perms;
1579
1580 DLIST_ADD(*pp_ace, pace);
1581
1582 got_duplicate_user = true;
1583 }
1584
1585 if (!got_duplicate_group) {
1586 /* Add a duplicate SMB_ACL_GROUP entry. */
1587 if ((pace = talloc(talloc_tos(), canon_ace)) == NULL) {
1588 DEBUG(0,("ensure_canon_entry_valid: talloc fail.\n"));
1589 return false;
1590 }
1591
1592 ZERO_STRUCTP(pace);
1593 pace->type = SMB_ACL_GROUP;;
1594 pace->owner_type = GID_ACE;
1595 pace->unix_ug.type = ID_TYPE_GID;
1596 pace->unix_ug.id = pace_group->unix_ug.id;
1597 pace->trustee = pace_group->trustee;
1598 pace->attr = pace_group->attr;
1599 pace->perms = pace_group->perms;
1600
1601 DLIST_ADD(*pp_ace, pace);
1602
1603 got_duplicate_group = true;
1604 }
1605
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, canon_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, canon_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 int 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 if (nt4_compatible_acls()) {
1868 /*
1869 * The security mask may be UNIX_ACCESS_NONE which should map into
1870 * no permissions (we overload the WRITE_OWNER bit for this) or it
1871 * should be one of the ALL/EXECUTE/READ/WRITE bits. Arrange for this
1872 * to be so. Any other bits override the UNIX_ACCESS_NONE bit.
1873 */
1874
1875 /*
1876 * Convert GENERIC bits to specific bits.
1877 */
1878
1879 se_map_generic(&psa->access_mask, &file_generic_mapping);
1880
1881 psa->access_mask &= (UNIX_ACCESS_NONE|FILE_ALL_ACCESS);
1882
1883 if(psa->access_mask != UNIX_ACCESS_NONE)
1884 psa->access_mask &= ~UNIX_ACCESS_NONE;
1885 }
1886 }
1887
1888 /*
1889 * Deal with the fact that NT 4.x re-writes the canonical format
1890 * that we return for default ACLs. If a directory ACE is identical
1891 * to a inherited directory ACE then NT changes the bits so that the
1892 * first ACE is set to OI|IO and the second ACE for this SID is set
1893 * to CI. We need to repair this. JRA.
1894 */
1895
1896 for(i = 0; i < dacl->num_aces; i++) {
1897 struct security_ace *psa1 = &dacl->aces[i];
1898
1899 for (j = i + 1; j < dacl->num_aces; j++) {
1900 struct security_ace *psa2 = &dacl->aces[j];
1901
1902 if (psa1->access_mask != psa2->access_mask)
1903 continue;
1904
1905 if (!dom_sid_equal(&psa1->trustee, &psa2->trustee))
1906 continue;
1907
1908 /*
1909 * Ok - permission bits and SIDs are equal.
1910 * Check if flags were re-written.
1911 */
1912
1913 if (psa1->flags & SEC_ACE_FLAG_INHERIT_ONLY) {
1914
1915 psa1->flags |= (psa2->flags & (SEC_ACE_FLAG_CONTAINER_INHERIT|SEC_ACE_FLAG_OBJECT_INHERIT));
1916 psa2->flags &= ~(SEC_ACE_FLAG_CONTAINER_INHERIT|SEC_ACE_FLAG_OBJECT_INHERIT);
1917
1918 } else if (psa2->flags & SEC_ACE_FLAG_INHERIT_ONLY) {
1919
1920 psa2->flags |= (psa1->flags & (SEC_ACE_FLAG_CONTAINER_INHERIT|SEC_ACE_FLAG_OBJECT_INHERIT));
1921 psa1->flags &= ~(SEC_ACE_FLAG_CONTAINER_INHERIT|SEC_ACE_FLAG_OBJECT_INHERIT);
1922
1923 }
1924 }
1925 }
1926
1927 for(i = 0; i < dacl->num_aces; i++) {
1928 struct security_ace *psa = &dacl->aces[i];
1929
1930 /*
1931 * Create a canon_ace entry representing this NT DACL ACE.
1932 */
1933
1934 if ((current_ace = talloc(talloc_tos(), canon_ace)) == NULL) {
1935 free_canon_ace_list(file_ace);
1936 free_canon_ace_list(dir_ace);
1937 DEBUG(0,("create_canon_ace_lists: malloc fail.\n"));
1938 return False;
1939 }
1940
1941 ZERO_STRUCTP(current_ace);
1942
1943 sid_copy(&current_ace->trustee, &psa->trustee);
1944
1945 /*
1946 * Try and work out if the SID is a user or group
1947 * as we need to flag these differently for POSIX.
1948 * Note what kind of a POSIX ACL this should map to.
1949 */
1950
1951 if( dom_sid_equal(&current_ace->trustee, &global_sid_World)) {
1952 current_ace->owner_type = WORLD_ACE;
1953 current_ace->unix_ug.type = ID_TYPE_NOT_SPECIFIED;
1954 current_ace->unix_ug.id = -1;
1955 current_ace->type = SMB_ACL_OTHER;
1956 } else if (dom_sid_equal(&current_ace->trustee, &global_sid_Creator_Owner)) {
1957 current_ace->owner_type = UID_ACE;
1958 current_ace->unix_ug.type = ID_TYPE_UID;
1959 current_ace->unix_ug.id = pst->st_ex_uid;
1960 current_ace->type = SMB_ACL_USER_OBJ;
1961
1962 /*
1963 * The Creator Owner entry only specifies inheritable permissions,
1964 * never access permissions. WinNT doesn't always set the ACE to
1965 * INHERIT_ONLY, though.
1966 */
1967
1968 psa->flags |= SEC_ACE_FLAG_INHERIT_ONLY;
1969
1970 } else if (dom_sid_equal(&current_ace->trustee, &global_sid_Creator_Group)) {
1971 current_ace->owner_type = GID_ACE;
1972 current_ace->unix_ug.type = ID_TYPE_GID;
1973 current_ace->unix_ug.id = pst->st_ex_gid;
1974 current_ace->type = SMB_ACL_GROUP_OBJ;
1975
1976 /*
1977 * The Creator Group entry only specifies inheritable permissions,
1978 * never access permissions. WinNT doesn't always set the ACE to
1979 * INHERIT_ONLY, though.
1980 */
1981 psa->flags |= SEC_ACE_FLAG_INHERIT_ONLY;
1982
1983 } else {
1984 struct unixid unixid;
1985
1986 if (!sids_to_unixids(&current_ace->trustee, 1, &unixid)) {
1987 free_canon_ace_list(file_ace);
1988 free_canon_ace_list(dir_ace);
1989 TALLOC_FREE(current_ace);
1990 DEBUG(0, ("create_canon_ace_lists: sids_to_unixids "
1991 "failed for %s (allocation failure)\n",
1992 sid_string_dbg(&current_ace->trustee)));
1993 return false;
1994 }
1995
1996 if (unixid.type == ID_TYPE_BOTH) {
1997 /* If it's the owning user, this is a
1998 * user_obj, not a user. This way, we
1999 * get a valid ACL for groups that own
2000 * files, without putting user ACL
2001 * entries in for groups otherwise */
2002 if (unixid.id == pst->st_ex_uid) {
2003 current_ace->owner_type = UID_ACE;
2004 current_ace->unix_ug.type = ID_TYPE_UID;
2005 current_ace->unix_ug.id = unixid.id;
2006 current_ace->type = SMB_ACL_USER_OBJ;
2007
2008 /* Add the user object to the posix ACL,
2009 and proceed to the group mapping
2010 below. This handles the talloc_free
2011 of current_ace if not added for some
2012 reason */
2013 if (!add_current_ace_to_acl(fsp,
2014 psa,
2015 &file_ace,
2016 &dir_ace,
2017 &got_file_allow,
2018 &got_dir_allow,
2019 &all_aces_are_inherit_only,
2020 current_ace)) {
2021 free_canon_ace_list(file_ace);
2022 free_canon_ace_list(dir_ace);
2023 return false;
2024 }
2025
2026 if ((current_ace = talloc(talloc_tos(),
2027 canon_ace)) == NULL) {
2028 free_canon_ace_list(file_ace);
2029 free_canon_ace_list(dir_ace);
2030 DEBUG(0,("create_canon_ace_lists: "
2031 "malloc fail.\n"));
2032 return False;
2033 }
2034
2035 ZERO_STRUCTP(current_ace);
2036 }
2037
2038 sid_copy(&current_ace->trustee, &psa->trustee);
2039
2040 current_ace->unix_ug.type = ID_TYPE_GID;
2041 current_ace->unix_ug.id = unixid.id;
2042 current_ace->owner_type = GID_ACE;
2043 /* If it's the primary group, this is a
2044 group_obj, not a group. */
2045 if (current_ace->unix_ug.id == pst->st_ex_gid) {
2046 current_ace->type = SMB_ACL_GROUP_OBJ;
2047 } else {
2048 current_ace->type = SMB_ACL_GROUP;
2049 }
2050
2051 } else if (unixid.type == ID_TYPE_UID) {
2052 current_ace->owner_type = UID_ACE;
2053 current_ace->unix_ug.type = ID_TYPE_UID;
2054 current_ace->unix_ug.id = unixid.id;
2055 /* If it's the owning user, this is a user_obj,
2056 not a user. */
2057 if (current_ace->unix_ug.id == pst->st_ex_uid) {
2058 current_ace->type = SMB_ACL_USER_OBJ;
2059 } else {
2060 current_ace->type = SMB_ACL_USER;
2061 }
2062 } else if (unixid.type == ID_TYPE_GID) {
2063 current_ace->unix_ug.type = ID_TYPE_GID;
2064 current_ace->unix_ug.id = unixid.id;
2065 current_ace->owner_type = GID_ACE;
2066 /* If it's the primary group, this is a
2067 group_obj, not a group. */
2068 if (current_ace->unix_ug.id == pst->st_ex_gid) {
2069 current_ace->type = SMB_ACL_GROUP_OBJ;
2070 } else {
2071 current_ace->type = SMB_ACL_GROUP;
2072 }
2073 } else {
2074 /*
2075 * Silently ignore map failures in non-mappable SIDs (NT Authority, BUILTIN etc).
2076 */
2077
2078 if (non_mappable_sid(&psa->trustee)) {
2079 DEBUG(10, ("create_canon_ace_lists: ignoring "
2080 "non-mappable SID %s\n",
2081 sid_string_dbg(&psa->trustee)));
2082 TALLOC_FREE(current_ace);
2083 continue;
2084 }
2085
2086 if (lp_force_unknown_acl_user(SNUM(fsp->conn))) {
2087 DEBUG(10, ("create_canon_ace_lists: ignoring "
2088 "unknown or foreign SID %s\n",
2089 sid_string_dbg(&psa->trustee)));
2090 TALLOC_FREE(current_ace);
2091 continue;
2092 }
2093
2094 free_canon_ace_list(file_ace);
2095 free_canon_ace_list(dir_ace);
2096 DEBUG(0, ("create_canon_ace_lists: unable to map SID "
2097 "%s to uid or gid.\n",
2098 sid_string_dbg(&current_ace->trustee)));
2099 TALLOC_FREE(current_ace);
2100 return false;
2101 }
2102 }
2103
2104 /* handles the talloc_free of current_ace if not added for some reason */
2105 if (!add_current_ace_to_acl(fsp, psa, &file_ace, &dir_ace,
2106 &got_file_allow, &got_dir_allow,
2107 &all_aces_are_inherit_only, current_ace)) {
2108 free_canon_ace_list(file_ace);
2109 free_canon_ace_list(dir_ace);
2110 return false;
2111 }
2112 }
2113
2114 if (fsp->is_directory && all_aces_are_inherit_only) {
2115 /*
2116 * Windows 2000 is doing one of these weird 'inherit acl'
2117 * traverses to conserve NTFS ACL resources. Just pretend
2118 * there was no DACL sent. JRA.
2119 */
2120
2121 DEBUG(10,("create_canon_ace_lists: Win2k inherit acl traverse. Ignoring DACL.\n"));
2122 free_canon_ace_list(file_ace);
2123 free_canon_ace_list(dir_ace);
2124 file_ace = NULL;
2125 dir_ace = NULL;
2126 } else {
2127 /*
2128 * Check if we have SMB_ACL_USER_OBJ and SMB_ACL_GROUP_OBJ entries in
2129 * the file ACL. If we don't have them, check if any SMB_ACL_USER/SMB_ACL_GROUP
2130 * entries can be converted to *_OBJ. Don't do this for the default
2131 * ACL, we will create them separately for this if needed inside
2132 * ensure_canon_entry_valid().
2133 */
2134 if (file_ace) {
2135 check_owning_objs(file_ace, pfile_owner_sid, pfile_grp_sid);
2136 }
2137 }
2138
2139 *ppfile_ace = file_ace;
2140 *ppdir_ace = dir_ace;
2141
2142 return True;
2143 }
2144
2145 /****************************************************************************
2146 ASCII art time again... JRA :-).
2147
2148 We have 4 cases to process when moving from an NT ACL to a POSIX ACL. Firstly,
2149 we insist the ACL is in canonical form (ie. all DENY entries preceede ALLOW
2150 entries). Secondly, the merge code has ensured that all duplicate SID entries for
2151 allow or deny have been merged, so the same SID can only appear once in the deny
2152 list or once in the allow list.
2153
2154 We then process as follows :
2155
2156 ---------------------------------------------------------------------------
2157 First pass - look for a Everyone DENY entry.
2158
2159 If it is deny all (rwx) trunate the list at this point.
2160 Else, walk the list from this point and use the deny permissions of this
2161 entry as a mask on all following allow entries. Finally, delete
2162 the Everyone DENY entry (we have applied it to everything possible).
2163
2164 In addition, in this pass we remove any DENY entries that have
2165 no permissions (ie. they are a DENY nothing).
2166 ---------------------------------------------------------------------------
2167 Second pass - only deal with deny user entries.
2168
2169 DENY user1 (perms XXX)
2170
2171 new_perms = 0
2172 for all following allow group entries where user1 is in group
2173 new_perms |= group_perms;
2174
2175 user1 entry perms = new_perms & ~ XXX;
2176
2177 Convert the deny entry to an allow entry with the new perms and
2178 push to the end of the list. Note if the user was in no groups
2179 this maps to a specific allow nothing entry for this user.
2180
2181 The common case from the NT ACL choser (userX deny all) is
2182 optimised so we don't do the group lookup - we just map to
2183 an allow nothing entry.
2184
2185 What we're doing here is inferring the allow permissions the
2186 person setting the ACE on user1 wanted by looking at the allow
2187 permissions on the groups the user is currently in. This will
2188 be a snapshot, depending on group membership but is the best
2189 we can do and has the advantage of failing closed rather than
2190 open.
2191 ---------------------------------------------------------------------------
2192 Third pass - only deal with deny group entries.
2193
2194 DENY group1 (perms XXX)
2195
2196 for all following allow user entries where user is in group1
2197 user entry perms = user entry perms & ~ XXX;
2198
2199 If there is a group Everyone allow entry with permissions YYY,
2200 convert the group1 entry to an allow entry and modify its
2201 permissions to be :
2202
2203 new_perms = YYY & ~ XXX
2204
2205 and push to the end of the list.
2206
2207 If there is no group Everyone allow entry then convert the
2208 group1 entry to a allow nothing entry and push to the end of the list.
2209
2210 Note that the common case from the NT ACL choser (groupX deny all)
2211 cannot be optimised here as we need to modify user entries who are
2212 in the group to change them to a deny all also.
2213
2214 What we're doing here is modifying the allow permissions of
2215 user entries (which are more specific in POSIX ACLs) to mask
2216 out the explicit deny set on the group they are in. This will
2217 be a snapshot depending on current group membership but is the
2218 best we can do and has the advantage of failing closed rather
2219 than open.
2220 ---------------------------------------------------------------------------
2221 Fourth pass - cope with cumulative permissions.
2222
2223 for all allow user entries, if there exists an allow group entry with
2224 more permissive permissions, and the user is in that group, rewrite the
2225 allow user permissions to contain both sets of permissions.
2226
2227 Currently the code for this is #ifdef'ed out as these semantics make
2228 no sense to me. JRA.
2229 ---------------------------------------------------------------------------
2230
2231 Note we *MUST* do the deny user pass first as this will convert deny user
2232 entries into allow user entries which can then be processed by the deny
2233 group pass.
2234
2235 The above algorithm took a *lot* of thinking about - hence this
2236 explaination :-). JRA.
2237 ****************************************************************************/
2238
2239 /****************************************************************************
2240 Process a canon_ace list entries. This is very complex code. We need
2241 to go through and remove the "deny" permissions from any allow entry that matches
2242 the id of this entry. We have already refused any NT ACL that wasn't in correct
2243 order (DENY followed by ALLOW). If any allow entry ends up with zero permissions,
2244 we just remove it (to fail safe). We have already removed any duplicate ace
2245 entries. Treat an "Everyone" DENY_ACE as a special case - use it to mask all
2246 allow entries.
2247 ****************************************************************************/
2248
2249 static void process_deny_list(connection_struct *conn, canon_ace **pp_ace_list )
2250 {
2251 canon_ace *ace_list = *pp_ace_list;
2252 canon_ace *curr_ace = NULL;
2253 canon_ace *curr_ace_next = NULL;
2254
2255 /* Pass 1 above - look for an Everyone, deny entry. */
2256
2257 for (curr_ace = ace_list; curr_ace; curr_ace = curr_ace_next) {
2258 canon_ace *allow_ace_p;
2259
2260 curr_ace_next = curr_ace->next; /* So we can't lose the link. */
2261
2262 if (curr_ace->attr != DENY_ACE)
2263 continue;
2264
2265 if (curr_ace->perms == (mode_t)0) {
2266
2267 /* Deny nothing entry - delete. */
2268
2269 DLIST_REMOVE(ace_list, curr_ace);
2270 continue;
2271 }
2272
2273 if (!dom_sid_equal(&curr_ace->trustee, &global_sid_World))
2274 continue;
2275
2276 /* JRATEST - assert. */
2277 SMB_ASSERT(curr_ace->owner_type == WORLD_ACE);
2278
2279 if (curr_ace->perms == ALL_ACE_PERMS) {
2280
2281 /*
2282 * Optimisation. This is a DENY_ALL to Everyone. Truncate the
2283 * list at this point including this entry.
2284 */
2285
2286 canon_ace *prev_entry = DLIST_PREV(curr_ace);
2287
2288 free_canon_ace_list( curr_ace );
2289 if (prev_entry)
2290 DLIST_REMOVE(ace_list, prev_entry);
2291 else {
2292 /* We deleted the entire list. */
2293 ace_list = NULL;
2294 }
2295 break;
2296 }
2297
2298 for (allow_ace_p = curr_ace->next; allow_ace_p; allow_ace_p = allow_ace_p->next) {
2299
2300 /*
2301 * Only mask off allow entries.
2302 */
2303
2304 if (allow_ace_p->attr != ALLOW_ACE)
2305 continue;
2306
2307 allow_ace_p->perms &= ~curr_ace->perms;
2308 }
2309
2310 /*
2311 * Now it's been applied, remove it.
2312 */
2313
2314 DLIST_REMOVE(ace_list, curr_ace);
2315 }
2316
2317 /* Pass 2 above - deal with deny user entries. */
2318
2319 for (curr_ace = ace_list; curr_ace; curr_ace = curr_ace_next) {
2320 mode_t new_perms = (mode_t)0;
2321 canon_ace *allow_ace_p;
2322
2323 curr_ace_next = curr_ace->next; /* So we can't lose the link. */
2324
2325 if (curr_ace->attr != DENY_ACE)
2326 continue;
2327
2328 if (curr_ace->owner_type != UID_ACE)
2329 continue;
2330
2331 if (curr_ace->perms == ALL_ACE_PERMS) {
2332
2333 /*
2334 * Optimisation - this is a deny everything to this user.
2335 * Convert to an allow nothing and push to the end of the list.
2336 */
2337
2338 curr_ace->attr = ALLOW_ACE;
2339 curr_ace->perms = (mode_t)0;
2340 DLIST_DEMOTE(ace_list, curr_ace, canon_ace *);
2341 continue;
2342 }
2343
2344 for (allow_ace_p = curr_ace->next; allow_ace_p; allow_ace_p = allow_ace_p->next) {
2345
2346 if (allow_ace_p->attr != ALLOW_ACE)
2347 continue;
2348
2349 /* We process GID_ACE and WORLD_ACE entries only. */
2350
2351 if (allow_ace_p->owner_type == UID_ACE)
2352 continue;
2353
2354 if (uid_entry_in_group(conn, curr_ace, allow_ace_p))
2355 new_perms |= allow_ace_p->perms;
2356 }
2357
2358 /*
2359 * Convert to a allow entry, modify the perms and push to the end
2360 * of the list.
2361 */
2362
2363 curr_ace->attr = ALLOW_ACE;
2364 curr_ace->perms = (new_perms & ~curr_ace->perms);
2365 DLIST_DEMOTE(ace_list, curr_ace, canon_ace *);
2366 }
2367
2368 /* Pass 3 above - deal with deny group entries. */
2369
2370 for (curr_ace = ace_list; curr_ace; curr_ace = curr_ace_next) {
2371 canon_ace *allow_ace_p;
2372 canon_ace *allow_everyone_p = NULL;
2373
2374 curr_ace_next = curr_ace->next; /* So we can't lose the link. */
2375
2376 if (curr_ace->attr != DENY_ACE)
2377 continue;
2378
2379 if (curr_ace->owner_type != GID_ACE)
2380 continue;
2381
2382 for (allow_ace_p = curr_ace->next; allow_ace_p; allow_ace_p = allow_ace_p->next) {
2383
2384 if (allow_ace_p->attr != ALLOW_ACE)
2385 continue;
2386
2387 /* Store a pointer to the Everyone allow, if it exists. */
2388 if (allow_ace_p->owner_type == WORLD_ACE)
2389 allow_everyone_p = allow_ace_p;
2390
2391 /* We process UID_ACE entries only. */
2392
2393 if (allow_ace_p->owner_type != UID_ACE)
2394 continue;
2395
2396 /* Mask off the deny group perms. */
2397
2398 if (uid_entry_in_group(conn, allow_ace_p, curr_ace))
2399 allow_ace_p->perms &= ~curr_ace->perms;
2400 }
2401
2402 /*
2403 * Convert the deny to an allow with the correct perms and
2404 * push to the end of the list.
2405 */
2406
2407 curr_ace->attr = ALLOW_ACE;
2408 if (allow_everyone_p)
2409 curr_ace->perms = allow_everyone_p->perms & ~curr_ace->perms;
2410 else
2411 curr_ace->perms = (mode_t)0;
2412 DLIST_DEMOTE(ace_list, curr_ace, canon_ace *);
2413 }
2414
2415 /* Doing this fourth pass allows Windows semantics to be layered
2416 * on top of POSIX semantics. I'm not sure if this is desirable.
2417 * For example, in W2K ACLs there is no way to say, "Group X no
2418 * access, user Y full access" if user Y is a member of group X.
2419 * This seems completely broken semantics to me.... JRA.
2420 */
2421
2422 #if 0
2423 /* Pass 4 above - deal with allow entries. */
2424
2425 for (curr_ace = ace_list; curr_ace; curr_ace = curr_ace_next) {
2426 canon_ace *allow_ace_p;
2427
2428 curr_ace_next = curr_ace->next; /* So we can't lose the link. */
2429
2430 if (curr_ace->attr != ALLOW_ACE)
2431 continue;
2432
2433 if (curr_ace->owner_type != UID_ACE)
2434 continue;
2435
2436 for (allow_ace_p = ace_list; allow_ace_p; allow_ace_p = allow_ace_p->next) {
2437
2438 if (allow_ace_p->attr != ALLOW_ACE)
2439 continue;
2440
2441 /* We process GID_ACE entries only. */
2442
2443 if (allow_ace_p->owner_type != GID_ACE)
2444 continue;
2445
2446 /* OR in the group perms. */
2447
2448 if (uid_entry_in_group(conn, curr_ace, allow_ace_p))
2449 curr_ace->perms |= allow_ace_p->perms;
2450 }
2451 }
2452 #endif
2453
2454 *pp_ace_list = ace_list;
2455 }
2456
2457 /****************************************************************************
2458 Unpack a struct security_descriptor into two canonical ace lists. We don't depend on this
2459 succeeding.
2460 ****************************************************************************/
2461
2462 static bool unpack_canon_ace(files_struct *fsp,
2463 const SMB_STRUCT_STAT *pst,
2464 struct dom_sid *pfile_owner_sid,
2465 struct dom_sid *pfile_grp_sid,
2466 canon_ace **ppfile_ace,
2467 canon_ace **ppdir_ace,
2468 uint32 security_info_sent,
2469 const struct security_descriptor *psd)
2470 {
2471 canon_ace *file_ace = NULL;
2472 canon_ace *dir_ace = NULL;
2473
2474 *ppfile_ace = NULL;
2475 *ppdir_ace = NULL;
2476
2477 if(security_info_sent == 0) {
2478 DEBUG(0,("unpack_canon_ace: no security info sent !\n"));
2479 return False;
2480 }
2481
2482 /*
2483 * If no DACL then this is a chown only security descriptor.
2484 */
2485
2486 if(!(security_info_sent & SECINFO_DACL) || !psd->dacl)
2487 return True;
2488
2489 /*
2490 * Now go through the DACL and create the canon_ace lists.
2491 */
2492
2493 if (!create_canon_ace_lists( fsp, pst, pfile_owner_sid, pfile_grp_sid,
2494 &file_ace, &dir_ace, psd->dacl))
2495 return False;
2496
2497 if ((file_ace == NULL) && (dir_ace == NULL)) {
2498 /* W2K traverse DACL set - ignore. */
2499 return True;
2500 }
2501
2502 /*
2503 * Go through the canon_ace list and merge entries
2504 * belonging to identical users of identical allow or deny type.
2505 * We can do this as all deny entries come first, followed by
2506 * all allow entries (we have mandated this before accepting this acl).
2507 */
2508
2509 print_canon_ace_list( "file ace - before merge", file_ace);
2510 merge_aces( &file_ace, false);
2511
2512 print_canon_ace_list( "dir ace - before merge", dir_ace);
2513 merge_aces( &dir_ace, true);
2514
2515 /*
2516 * NT ACLs are order dependent. Go through the acl lists and
2517 * process DENY entries by masking the allow entries.
2518 */
2519
2520 print_canon_ace_list( "file ace - before deny", file_ace);
2521 process_deny_list(fsp->conn, &file_ace);
2522
2523 print_canon_ace_list( "dir ace - before deny", dir_ace);
2524 process_deny_list(fsp->conn, &dir_ace);
2525
2526 /*
2527 * A well formed POSIX file or default ACL has at least 3 entries, a
2528 * SMB_ACL_USER_OBJ, SMB_ACL_GROUP_OBJ, SMB_ACL_OTHER_OBJ
2529 * and optionally a mask entry. Ensure this is the case.
2530 */
2531
2532 print_canon_ace_list( "file ace - before valid", file_ace);
2533
2534 if (!ensure_canon_entry_valid(fsp->conn, &file_ace, fsp->conn->params,
2535 fsp->is_directory, pfile_owner_sid, pfile_grp_sid, pst, True)) {
2536 free_canon_ace_list(file_ace);
2537 free_canon_ace_list(dir_ace);
2538 return False;
2539 }
2540
2541 print_canon_ace_list( "dir ace - before valid", dir_ace);
2542
2543 if (dir_ace && !ensure_canon_entry_valid(fsp->conn, &dir_ace, fsp->conn->params,
2544 fsp->is_directory, pfile_owner_sid, pfile_grp_sid, pst, True)) {
2545 free_canon_ace_list(file_ace);
2546 free_canon_ace_list(dir_ace);
2547 return False;
2548 }
2549
2550 print_canon_ace_list( "file ace - return", file_ace);
2551 print_canon_ace_list( "dir ace - return", dir_ace);
2552
2553 *ppfile_ace = file_ace;
2554 *ppdir_ace = dir_ace;
2555 return True;
2556
2557 }
2558
2559 /******************************************************************************
2560 When returning permissions, try and fit NT display
2561 semantics if possible. Note the the canon_entries here must have been malloced.
2562 The list format should be - first entry = owner, followed by group and other user
2563 entries, last entry = other.
2564
2565 Note that this doesn't exactly match the NT semantics for an ACL. As POSIX entries
2566 are not ordered, and match on the most specific entry rather than walking a list,
2567 then a simple POSIX permission of rw-r--r-- should really map to 5 entries,
2568
2569 Entry 0: owner : deny all except read and write.
2570 Entry 1: owner : allow read and write.
2571 Entry 2: group : deny all except read.
2572 Entry 3: group : allow read.
2573 Entry 4: Everyone : allow read.
2574
2575 But NT cannot display this in their ACL editor !
2576 ********************************************************************************/
2577
2578 static void arrange_posix_perms(const char *filename, canon_ace **pp_list_head)
2579 {
2580 canon_ace *l_head = *pp_list_head;
2581 canon_ace *owner_ace = NULL;
2582 canon_ace *other_ace = NULL;
2583 canon_ace *ace = NULL;
2584
2585 for (ace = l_head; ace; ace = ace->next) {
2586 if (ace->type == SMB_ACL_USER_OBJ)
2587 owner_ace = ace;
2588 else if (ace->type == SMB_ACL_OTHER) {
2589 /* Last ace - this is "other" */
2590 other_ace = ace;
2591 }
2592 }
2593
2594 if (!owner_ace || !other_ace) {
2595 DEBUG(0,("arrange_posix_perms: Invalid POSIX permissions for file %s, missing owner or other.\n",
2596 filename ));
2597 return;
2598 }
2599
2600 /*
2601 * The POSIX algorithm applies to owner first, and other last,
2602 * so ensure they are arranged in this order.
2603 */
2604
2605 if (owner_ace) {
2606 DLIST_PROMOTE(l_head, owner_ace);
2607 }
2608
2609 if (other_ace) {
2610 DLIST_DEMOTE(l_head, other_ace, canon_ace *);
2611 }
2612
2613 /* We have probably changed the head of the list. */
2614
2615 *pp_list_head = l_head;
2616 }
2617
2618 /****************************************************************************
2619 Create a linked list of canonical ACE entries.
2620 ****************************************************************************/
2621
2622 static canon_ace *canonicalise_acl(struct connection_struct *conn,
2623 const char *fname, SMB_ACL_T posix_acl,
2624 const SMB_STRUCT_STAT *psbuf,
2625 const struct dom_sid *powner, const struct dom_sid *pgroup, struct pai_val *pal, SMB_ACL_TYPE_T the_acl_type)
2626 {
2627 mode_t acl_mask = (S_IRUSR|S_IWUSR|S_IXUSR);
2628 canon_ace *l_head = NULL;
2629 canon_ace *ace = NULL;
2630 canon_ace *next_ace = NULL;
2631 int entry_id = SMB_ACL_FIRST_ENTRY;
2632 bool is_default_acl = (the_acl_type == SMB_ACL_TYPE_DEFAULT);
2633 SMB_ACL_ENTRY_T entry;
2634 size_t ace_count;
2635
2636 while ( posix_acl && (sys_acl_get_entry(posix_acl, entry_id, &entry) == 1)) {
2637 SMB_ACL_TAG_T tagtype;
2638 SMB_ACL_PERMSET_T permset;
2639 struct dom_sid sid;
2640 struct unixid unix_ug;
2641 enum ace_owner owner_type;
2642
2643 entry_id = SMB_ACL_NEXT_ENTRY;
2644
2645 /* Is this a MASK entry ? */
2646 if (sys_acl_get_tag_type(entry, &tagtype) == -1)
2647 continue;
2648
2649 if (sys_acl_get_permset(entry, &permset) == -1)
2650 continue;
2651
2652 /* Decide which SID to use based on the ACL type. */
2653 switch(tagtype) {
2654 case SMB_ACL_USER_OBJ:
2655 /* Get the SID from the owner. */
2656 sid_copy(&sid, powner);
2657 unix_ug.type = ID_TYPE_UID;
2658 unix_ug.id = psbuf->st_ex_uid;
2659 owner_type = UID_ACE;
2660 break;
2661 case SMB_ACL_USER:
2662 {
2663 uid_t *puid = (uid_t *)sys_acl_get_qualifier(entry);
2664 if (puid == NULL) {
2665 DEBUG(0,("canonicalise_acl: Failed to get uid.\n"));
2666 continue;
2667 }
2668 uid_to_sid( &sid, *puid);
2669 unix_ug.type = ID_TYPE_UID;
2670 unix_ug.id = *puid;
2671 owner_type = UID_ACE;
2672 break;
2673 }
2674 case SMB_ACL_GROUP_OBJ:
2675 /* Get the SID from the owning group. */
2676 sid_copy(&sid, pgroup);
2677 unix_ug.type = ID_TYPE_GID;
2678 unix_ug.id = psbuf->st_ex_gid;
2679 owner_type = GID_ACE;
2680 break;
2681 case SMB_ACL_GROUP:
2682 {
2683 gid_t *pgid = (gid_t *)sys_acl_get_qualifier(entry);
2684 if (pgid == NULL) {
2685 DEBUG(0,("canonicalise_acl: Failed to get gid.\n"));
2686 continue;
2687 }
2688 gid_to_sid( &sid, *pgid);
2689 unix_ug.type = ID_TYPE_GID;
2690 unix_ug.id = *pgid;
2691 owner_type = GID_ACE;
2692 break;
2693 }
2694 case SMB_ACL_MASK:
2695 acl_mask = convert_permset_to_mode_t(permset);
2696 continue; /* Don't count the mask as an entry. */
2697 case SMB_ACL_OTHER:
2698 /* Use the Everyone SID */
2699 sid = global_sid_World;
2700 unix_ug.type = ID_TYPE_NOT_SPECIFIED;
2701 unix_ug.id = -1;
2702 owner_type = WORLD_ACE;
2703 break;
2704 default:
2705 DEBUG(0,("canonicalise_acl: Unknown tagtype %u\n", (unsigned int)tagtype));
2706 continue;
2707 }
2708
2709 /*
2710 * Add this entry to the list.
2711 */
2712
2713 if ((ace = talloc(talloc_tos(), canon_ace)) == NULL)
2714 goto fail;
2715
2716 ZERO_STRUCTP(ace);
2717 ace->type = tagtype;
2718 ace->perms = convert_permset_to_mode_t(permset);
2719 ace->attr = ALLOW_ACE;
2720 ace->trustee = sid;
2721 ace->unix_ug = unix_ug;
2722 ace->owner_type = owner_type;
2723 ace->ace_flags = get_pai_flags(pal, ace, is_default_acl);
2724
2725 DLIST_ADD(l_head, ace);
2726 }
2727
2728 /*
2729 * This next call will ensure we have at least a user/group/world set.
2730 */
2731
2732 if (!ensure_canon_entry_valid(conn, &l_head, conn->params,
2733 S_ISDIR(psbuf->st_ex_mode), powner, pgroup,
2734 psbuf, False))
2735 goto fail;
2736
2737 /*
2738 * Now go through the list, masking the permissions with the
2739 * acl_mask. Ensure all DENY Entries are at the start of the list.
2740 */
2741
2742 DEBUG(10,("canonicalise_acl: %s ace entries before arrange :\n", is_default_acl ? "Default" : "Access"));
2743
2744 for ( ace_count = 0, ace = l_head; ace; ace = next_ace, ace_count++) {
2745 next_ace = ace->next;
2746
2747 /* Masks are only applied to entries other than USER_OBJ and OTHER. */
2748 if (ace->type != SMB_ACL_OTHER && ace->type != SMB_ACL_USER_OBJ)
2749 ace->perms &= acl_mask;
2750
2751 if (ace->perms == 0) {
2752 DLIST_PROMOTE(l_head, ace);
2753 }
2754
2755 if( DEBUGLVL( 10 ) ) {
2756 print_canon_ace(ace, ace_count);
2757 }
2758 }
2759
2760 arrange_posix_perms(fname,&l_head );
2761
2762 print_canon_ace_list( "canonicalise_acl: ace entries after arrange", l_head );
2763
2764 return l_head;
2765
2766 fail:
2767
2768 free_canon_ace_list(l_head);
2769 return NULL;
2770 }
2771
2772 /****************************************************************************
2773 Check if the current user group list contains a given group.
2774 ****************************************************************************/
2775
2776 bool current_user_in_group(connection_struct *conn, gid_t gid)
2777 {
2778 int i;
2779 const struct security_unix_token *utok = get_current_utok(conn);
2780
2781 for (i = 0; i < utok->ngroups; i++) {
2782 if (utok->groups[i] == gid) {
2783 return True;
2784 }
2785 }
2786
2787 return False;
2788 }
2789
2790 /****************************************************************************
2791 Should we override a deny ? Check 'acl group control' and 'dos filemode'.
2792 ****************************************************************************/
2793
2794 static bool acl_group_override(connection_struct *conn,
2795 const struct smb_filename *smb_fname)
2796 {
2797 if ((errno != EPERM) && (errno != EACCES)) {
2798 return false;
2799 }
2800
2801 /* file primary group == user primary or supplementary group */
2802 if (lp_acl_group_control(SNUM(conn)) &&
2803 current_user_in_group(conn, smb_fname->st.st_ex_gid)) {
2804 return true;
2805 }
2806
2807 /* user has writeable permission */
2808 if (lp_dos_filemode(SNUM(conn)) &&
2809 can_write_to_file(conn, smb_fname)) {
2810 return true;
2811 }
2812
2813 return false;
2814 }
2815
2816 /****************************************************************************
2817 Attempt to apply an ACL to a file or directory.
2818 ****************************************************************************/
2819
2820 static bool set_canon_ace_list(files_struct *fsp,
2821 canon_ace *the_ace,
2822 bool default_ace,
2823 const SMB_STRUCT_STAT *psbuf,
2824 bool *pacl_set_support)
2825 {
2826 connection_struct *conn = fsp->conn;
2827 bool ret = False;
2828 SMB_ACL_T the_acl = sys_acl_init();
2829 canon_ace *p_ace;
2830 int i;
2831 SMB_ACL_ENTRY_T mask_entry;
2832 bool got_mask_entry = False;
2833 SMB_ACL_PERMSET_T mask_permset;
2834 SMB_ACL_TYPE_T the_acl_type = (default_ace ? SMB_ACL_TYPE_DEFAULT : SMB_ACL_TYPE_ACCESS);
2835 bool needs_mask = False;
2836 mode_t mask_perms = 0;
2837
2838 /* Use the psbuf that was passed in. */
2839 if (psbuf != &fsp->fsp_name->st) {
2840 fsp->fsp_name->st = *psbuf;
2841 }
2842
2843 #if defined(POSIX_ACL_NEEDS_MASK)
2844 /* HP-UX always wants to have a mask (called "class" there). */
2845 needs_mask = True;
2846 #endif
2847
2848 if (the_acl == NULL) {
2849 DEBUG(0, ("sys_acl_init failed to allocate an ACL\n"));
2850 return false;
2851 }
2852
2853 if( DEBUGLVL( 10 )) {
2854 dbgtext("set_canon_ace_list: setting ACL:\n");
2855 for (i = 0, p_ace = the_ace; p_ace; p_ace = p_ace->next, i++ ) {
2856 print_canon_ace( p_ace, i);
2857 }
2858 }
2859
2860 for (i = 0, p_ace = the_ace; p_ace; p_ace = p_ace->next, i++ ) {
2861 SMB_ACL_ENTRY_T the_entry;
2862 SMB_ACL_PERMSET_T the_permset;
2863
2864 /*
2865 * ACLs only "need" an ACL_MASK entry if there are any named user or
2866 * named group entries. But if there is an ACL_MASK entry, it applies
2867 * to ACL_USER, ACL_GROUP, and ACL_GROUP_OBJ entries. Set the mask
2868 * so that it doesn't deny (i.e., mask off) any permissions.
2869 */
2870
2871 if (p_ace->type == SMB_ACL_USER || p_ace->type == SMB_ACL_GROUP) {
2872 needs_mask = True;
2873 mask_perms |= p_ace->perms;
2874 } else if (p_ace->type == SMB_ACL_GROUP_OBJ) {
2875 mask_perms |= p_ace->perms;
2876 }
2877
2878 /*
2879 * Get the entry for this ACE.
2880 */
2881
2882 if (sys_acl_create_entry(&the_acl, &the_entry) == -1) {
2883 DEBUG(0,("set_canon_ace_list: Failed to create entry %d. (%s)\n",
2884 i, strerror(errno) ));
2885 goto fail;
2886 }
2887
2888 if (p_ace->type == SMB_ACL_MASK) {
2889 mask_entry = the_entry;
2890 got_mask_entry = True;
2891 }
2892
2893 /*
2894 * Ok - we now know the ACL calls should be working, don't
2895 * allow fallback to chmod.
2896 */
2897
2898 *pacl_set_support = True;
2899
2900 /*
2901 * Initialise the entry from the canon_ace.
2902 */
2903
2904 /*
2905 * First tell the entry what type of ACE this is.
2906 */
2907
2908 if (sys_acl_set_tag_type(the_entry, p_ace->type) == -1) {
2909 DEBUG(0,("set_canon_ace_list: Failed to set tag type on entry %d. (%s)\n",
2910 i, strerror(errno) ));
2911 goto fail;
2912 }
2913
2914 /*
2915 * Only set the qualifier (user or group id) if the entry is a user
2916 * or group id ACE.
2917 */
2918
2919 if ((p_ace->type == SMB_ACL_USER) || (p_ace->type == SMB_ACL_GROUP)) {
2920 if (sys_acl_set_qualifier(the_entry,(void *)&p_ace->unix_ug.id) == -1) {
2921 DEBUG(0,("set_canon_ace_list: Failed to set qualifier on entry %d. (%s)\n",
2922 i, strerror(errno) ));
2923 goto fail;
2924 }
2925 }
2926
2927 /*
2928 * Convert the mode_t perms in the canon_ace to a POSIX permset.
2929 */
2930
2931 if (sys_acl_get_permset(the_entry, &the_permset) == -1) {
2932 DEBUG(0,("set_canon_ace_list: Failed to get permset on entry %d. (%s)\n",
2933 i, strerror(errno) ));
2934 goto fail;
2935 }
2936
2937 if (map_acl_perms_to_permset(conn, p_ace->perms, &the_permset) == -1) {
2938 DEBUG(0,("set_canon_ace_list: Failed to create permset for mode (%u) on entry %d. (%s)\n",
2939 (unsigned int)p_ace->perms, i, strerror(errno) ));
2940 goto fail;
2941 }
2942
2943 /*
2944 * ..and apply them to the entry.
2945 */
2946
2947 if (sys_acl_set_permset(the_entry, the_permset) == -1) {
2948 DEBUG(0,("set_canon_ace_list: Failed to add permset on entry %d. (%s)\n",
2949 i, strerror(errno) ));
2950 goto fail;
2951 }
2952
2953 if( DEBUGLVL( 10 ))
2954 print_canon_ace( p_ace, i);
2955
2956 }
2957
2958 if (needs_mask && !got_mask_entry) {
2959 if (sys_acl_create_entry(&the_acl, &mask_entry) == -1) {
2960 DEBUG(0,("set_canon_ace_list: Failed to create mask entry. (%s)\n", strerror(errno) ));
2961 goto fail;
2962 }
2963
2964 if (sys_acl_set_tag_type(mask_entry, SMB_ACL_MASK) == -1) {
2965 DEBUG(0,("set_canon_ace_list: Failed to set tag type on mask entry. (%s)\n",strerror(errno) ));
2966 goto fail;
2967 }
2968
2969 if (sys_acl_get_permset(mask_entry, &mask_permset) == -1) {
2970 DEBUG(0,("set_canon_ace_list: Failed to get mask permset. (%s)\n", strerror(errno) ));
2971 goto fail;
2972 }
2973
2974 if (map_acl_perms_to_permset(conn, S_IRUSR|S_IWUSR|S_IXUSR, &mask_permset) == -1) {
2975 DEBUG(0,("set_canon_ace_list: Failed to create mask permset. (%s)\n", strerror(errno) ));
2976 goto fail;
2977 }
2978
2979 if (sys_acl_set_permset(mask_entry, mask_permset) == -1) {
2980 DEBUG(0,("set_canon_ace_list: Failed to add mask permset. (%s)\n", strerror(errno) ));
2981 goto fail;
2982 }
2983 }
2984
2985 /*
2986 * Finally apply it to the file or directory.
2987 */
2988
2989 if(default_ace || fsp->is_directory || fsp->fh->fd == -1) {
2990 if (SMB_VFS_SYS_ACL_SET_FILE(conn, fsp->fsp_name->base_name,
2991 the_acl_type, the_acl) == -1) {
2992 /*
2993 * Some systems allow all the above calls and only fail with no ACL support
2994 * when attempting to apply the acl. HPUX with HFS is an example of this. JRA.
2995 */
2996 if (no_acl_syscall_error(errno)) {
2997 *pacl_set_support = False;
2998 }
2999
3000 if (acl_group_override(conn, fsp->fsp_name)) {
3001 int sret;
3002
3003 DEBUG(5,("set_canon_ace_list: acl group "
3004 "control on and current user in file "
3005 "%s primary group.\n",
3006 fsp_str_dbg(fsp)));
3007
3008 become_root();
3009 sret = SMB_VFS_SYS_ACL_SET_FILE(conn,
3010 fsp->fsp_name->base_name, the_acl_type,
3011 the_acl);
3012 unbecome_root();
3013 if (sret == 0) {
3014 ret = True;
3015 }
3016 }
3017
3018 if (ret == False) {
3019 DEBUG(2,("set_canon_ace_list: "
3020 "sys_acl_set_file type %s failed for "
3021 "file %s (%s).\n",
3022 the_acl_type == SMB_ACL_TYPE_DEFAULT ?
3023 "directory default" : "file",
3024 fsp_str_dbg(fsp), strerror(errno)));
3025 goto fail;
3026 }
3027 }
3028 } else {
3029 if (SMB_VFS_SYS_ACL_SET_FD(fsp, the_acl) == -1) {
3030 /*
3031 * Some systems allow all the above calls and only fail with no ACL support
3032 * when attempting to apply the acl. HPUX with HFS is an example of this. JRA.
3033 */
3034 if (no_acl_syscall_error(errno)) {
3035 *pacl_set_support = False;
3036 }
3037
3038 if (acl_group_override(conn, fsp->fsp_name)) {
3039 int sret;
3040
3041 DEBUG(5,("set_canon_ace_list: acl group "
3042 "control on and current user in file "
3043 "%s primary group.\n",
3044 fsp_str_dbg(fsp)));
3045
3046 become_root();
3047 sret = SMB_VFS_SYS_ACL_SET_FD(fsp, the_acl);
3048 unbecome_root();
3049 if (sret == 0) {
3050 ret = True;
3051 }
3052 }
3053
3054 if (ret == False) {
3055 DEBUG(2,("set_canon_ace_list: "
3056 "sys_acl_set_file failed for file %s "
3057 "(%s).\n",
3058 fsp_str_dbg(fsp), strerror(errno)));
3059 goto fail;
3060 }
3061 }
3062 }
3063
3064 ret = True;
3065
3066 fail:
3067
3068 if (the_acl != NULL) {
3069 TALLOC_FREE(the_acl);
3070 }
3071
3072 return ret;
3073 }
3074
3075 /****************************************************************************
3076 Find a particular canon_ace entry.
3077 ****************************************************************************/
3078
3079 static struct canon_ace *canon_ace_entry_for(struct canon_ace *list, SMB_ACL_TAG_T type, struct unixid *id)
3080 {
3081 while (list) {
3082 if (list->type == type && ((type != SMB_ACL_USER && type != SMB_ACL_GROUP) ||
3083 (type == SMB_ACL_USER && id && id->id == list->unix_ug.id) ||
3084 (type == SMB_ACL_GROUP && id && id->id == list->unix_ug.id)))
3085 break;
3086 list = list->next;
3087 }
3088 return list;
3089 }
3090
3091 /****************************************************************************
3092
3093 ****************************************************************************/
3094
3095 SMB_ACL_T free_empty_sys_acl(connection_struct *conn, SMB_ACL_T the_acl)
3096 {
3097 SMB_ACL_ENTRY_T entry;
3098
3099 if (!the_acl)
3100 return NULL;
3101 if (sys_acl_get_entry(the_acl, SMB_ACL_FIRST_ENTRY, &entry) != 1) {
3102 TALLOC_FREE(the_acl);
3103 return NULL;
3104 }
3105 return the_acl;
3106 }
3107
3108 /****************************************************************************
3109 Convert a canon_ace to a generic 3 element permission - if possible.
3110 ****************************************************************************/
3111
3112 #define MAP_PERM(p,mask,result) (((p) & (mask)) ? (result) : 0 )
3113
3114 static bool convert_canon_ace_to_posix_perms( files_struct *fsp, canon_ace *file_ace_list, mode_t *posix_perms)
3115 {
3116 int snum = SNUM(fsp->conn);
3117 size_t ace_count = count_canon_ace_list(file_ace_list);
3118 canon_ace *ace_p;
3119 canon_ace *owner_ace = NULL;
3120 canon_ace *group_ace = NULL;
3121 canon_ace *other_ace = NULL;
3122 mode_t and_bits;
3123 mode_t or_bits;
3124
3125 if (ace_count != 3) {
3126 DEBUG(3,("convert_canon_ace_to_posix_perms: Too many ACE "
3127 "entries for file %s to convert to posix perms.\n",
3128 fsp_str_dbg(fsp)));
3129 return False;
3130 }
3131
3132 for (ace_p = file_ace_list; ace_p; ace_p = ace_p->next) {
3133 if (ace_p->owner_type == UID_ACE)
3134 owner_ace = ace_p;
3135 else if (ace_p->owner_type == GID_ACE)
3136 group_ace = ace_p;
3137 else if (ace_p->owner_type == WORLD_ACE)
3138 other_ace = ace_p;
3139 }
3140
3141 if (!owner_ace || !group_ace || !other_ace) {
3142 DEBUG(3,("convert_canon_ace_to_posix_perms: Can't get "
3143 "standard entries for file %s.\n", fsp_str_dbg(fsp)));
3144 return False;
3145 }
3146
3147 *posix_perms = (mode_t)0;
3148
3149 *posix_perms |= owner_ace->perms;
3150 *posix_perms |= MAP_PERM(group_ace->perms, S_IRUSR, S_IRGRP);
3151 *posix_perms |= MAP_PERM(group_ace->perms, S_IWUSR, S_IWGRP);
3152 *posix_perms |= MAP_PERM(group_ace->perms, S_IXUSR, S_IXGRP);
3153 *posix_perms |= MAP_PERM(other_ace->perms, S_IRUSR, S_IROTH);
3154 *posix_perms |= MAP_PERM(other_ace->perms, S_IWUSR, S_IWOTH);
3155 *posix_perms |= MAP_PERM(other_ace->perms, S_IXUSR, S_IXOTH);
3156
3157 /* The owner must have at least read access. */
3158
3159 *posix_perms |= S_IRUSR;
3160 if (fsp->is_directory)
3161 *posix_perms |= (S_IWUSR|S_IXUSR);
3162
3163 /* If requested apply the masks. */
3164
3165 /* Get the initial bits to apply. */
3166
3167 if (fsp->is_directory) {
3168 and_bits = lp_dir_security_mask(snum);
3169 or_bits = lp_force_dir_security_mode(snum);
3170 } else {
3171 and_bits = lp_security_mask(snum);
3172 or_bits = lp_force_security_mode(snum);
3173 }
3174
3175 *posix_perms = (((*posix_perms) & and_bits)|or_bits);
3176
3177 DEBUG(10,("convert_canon_ace_to_posix_perms: converted u=%o,g=%o,w=%o "
3178 "to perm=0%o for file %s.\n", (int)owner_ace->perms,
3179 (int)group_ace->perms, (int)other_ace->perms,
3180 (int)*posix_perms, fsp_str_dbg(fsp)));
3181
3182 return True;
3183 }
3184
3185 /****************************************************************************
3186 Incoming NT ACLs on a directory can be split into a default POSIX acl (CI|OI|IO) and
3187 a normal POSIX acl. Win2k needs these split acls re-merging into one ACL
3188 with CI|OI set so it is inherited and also applies to the directory.
3189 Based on code from "Jim McDonough" <jmcd@us.ibm.com>.
3190 ****************************************************************************/
3191
3192 static size_t merge_default_aces( struct security_ace *nt_ace_list, size_t num_aces)
3193 {
3194 size_t i, j;
3195
3196 for (i = 0; i < num_aces; i++) {
3197 for (j = i+1; j < num_aces; j++) {
3198 uint32 i_flags_ni = (nt_ace_list[i].flags & ~SEC_ACE_FLAG_INHERITED_ACE);
3199 uint32 j_flags_ni = (nt_ace_list[j].flags & ~SEC_ACE_FLAG_INHERITED_ACE);
3200 bool i_inh = (nt_ace_list[i].flags & SEC_ACE_FLAG_INHERITED_ACE) ? True : False;
3201 bool j_inh = (nt_ace_list[j].flags & SEC_ACE_FLAG_INHERITED_ACE) ? True : False;
3202
3203 /* We know the lower number ACE's are file entries. */
3204 if ((nt_ace_list[i].type == nt_ace_list[j].type) &&
3205 (nt_ace_list[i].size == nt_ace_list[j].size) &&
3206 (nt_ace_list[i].access_mask == nt_ace_list[j].access_mask) &&
3207 dom_sid_equal(&nt_ace_list[i].trustee, &nt_ace_list[j].trustee) &&
3208 (i_inh == j_inh) &&
3209 (i_flags_ni == 0) &&
3210 (j_flags_ni == (SEC_ACE_FLAG_OBJECT_INHERIT|
3211 SEC_ACE_FLAG_CONTAINER_INHERIT|
3212 SEC_ACE_FLAG_INHERIT_ONLY))) {
3213 /*
3214 * W2K wants to have access allowed zero access ACE's
3215 * at the end of the list. If the mask is zero, merge
3216 * the non-inherited ACE onto the inherited ACE.
3217 */
3218
3219 if (nt_ace_list[i].access_mask == 0) {
3220 nt_ace_list[j].flags = SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT|
3221 (i_inh ? SEC_ACE_FLAG_INHERITED_ACE : 0);
3222 if (num_aces - i - 1 > 0)
3223 memmove(&nt_ace_list[i], &nt_ace_list[i+1], (num_aces-i-1) *
3224 sizeof(struct security_ace));
3225
3226 DEBUG(10,("merge_default_aces: Merging zero access ACE %u onto ACE %u.\n",
3227 (unsigned int)i, (unsigned int)j ));
3228 } else {
3229 /*
3230 * These are identical except for the flags.
3231 * Merge the inherited ACE onto the non-inherited ACE.
3232 */
3233
3234 nt_ace_list[i].flags = SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT|
3235 (i_inh ? SEC_ACE_FLAG_INHERITED_ACE : 0);
3236 if (num_aces - j - 1 > 0)
3237 memmove(&nt_ace_list[j], &nt_ace_list[j+1], (num_aces-j-1) *
3238 sizeof(struct security_ace));
3239
3240 DEBUG(10,("merge_default_aces: Merging ACE %u onto ACE %u.\n",
3241 (unsigned int)j, (unsigned int)i ));
3242 }
3243 num_aces--;
3244 break;
3245 }
3246 }
3247 }
3248
3249 return num_aces;
3250 }
3251
3252 /*
3253 * Add or Replace ACE entry.
3254 * In some cases we need to add a specific ACE for compatibility reasons.
3255 * When doing that we must make sure we are not actually creating a duplicate
3256 * entry. So we need to search whether an ACE entry already exist and eventually
3257 * replacce the access mask, or add a completely new entry if none was found.
3258 *
3259 * This function assumes the array has enough space to add a new entry without
3260 * any reallocation of memory.
3261 */
3262
3263 static void add_or_replace_ace(struct security_ace *nt_ace_list, size_t *num_aces,
3264 const struct dom_sid *sid, enum security_ace_type type,
3265 uint32_t mask, uint8_t flags)
3266 {
3267 int i;
3268
3269 /* first search for a duplicate */
3270 for (i = 0; i < *num_aces; i++) {
3271 if (dom_sid_equal(&nt_ace_list[i].trustee, sid) &&
3272 (nt_ace_list[i].flags == flags)) break;
3273 }
3274
3275 if (i < *num_aces) { /* found */
3276 nt_ace_list[i].type = type;
3277 nt_ace_list[i].access_mask = mask;
3278 DEBUG(10, ("Replacing ACE %d with SID %s and flags %02x\n",
3279 i, sid_string_dbg(sid), flags));
3280 return;
3281 }
3282
3283 /* not found, append it */
3284 init_sec_ace(&nt_ace_list[(*num_aces)++], sid, type, mask, flags);
3285 }
3286
3287
3288 /****************************************************************************
3289 Reply to query a security descriptor from an fsp. If it succeeds it allocates
3290 the space for the return elements and returns the size needed to return the
3291 security descriptor. This should be the only external function needed for
3292 the UNIX style get ACL.
3293 ****************************************************************************/
3294
3295 static NTSTATUS posix_get_nt_acl_common(struct connection_struct *conn,
3296 const char *name,
3297 const SMB_STRUCT_STAT *sbuf,
3298 struct pai_val *pal,
3299 SMB_ACL_T posix_acl,
3300 SMB_ACL_T def_acl,
3301 uint32_t security_info,
3302 struct security_descriptor **ppdesc)
3303 {
3304 struct dom_sid owner_sid;
3305 struct dom_sid group_sid;
3306 size_t sd_size = 0;
3307 struct security_acl *psa = NULL;
3308 size_t num_acls = 0;
3309 size_t num_def_acls = 0;
3310 size_t num_aces = 0;
3311 canon_ace *file_ace = NULL;
3312 canon_ace *dir_ace = NULL;
3313 struct security_ace *nt_ace_list = NULL;
3314 size_t num_profile_acls = 0;
3315 struct dom_sid orig_owner_sid;
3316 struct security_descriptor *psd = NULL;
3317 int i;
3318
3319 /*
3320 * Get the owner, group and world SIDs.
3321 */
3322
3323 create_file_sids(sbuf, &owner_sid, &group_sid);
3324
3325 if (lp_profile_acls(SNUM(conn))) {
3326 /* For WXP SP1 the owner must be administrators. */
3327 sid_copy(&orig_owner_sid, &owner_sid);
3328 sid_copy(&owner_sid, &global_sid_Builtin_Administrators);
3329 sid_copy(&group_sid, &global_sid_Builtin_Users);
3330 num_profile_acls = 3;
3331 }
3332
3333 if ((security_info & SECINFO_DACL) && !(security_info & SECINFO_PROTECTED_DACL)) {
3334
3335 /*
3336 * In the optimum case Creator Owner and Creator Group would be used for
3337 * the ACL_USER_OBJ and ACL_GROUP_OBJ entries, respectively, but this
3338 * would lead to usability problems under Windows: The Creator entries
3339 * are only available in browse lists of directories and not for files;
3340 * additionally the identity of the owning group couldn't be determined.
3341 * We therefore use those identities only for Default ACLs.
3342 */
3343
3344 /* Create the canon_ace lists. */
3345 file_ace = canonicalise_acl(conn, name, posix_acl, sbuf,
3346 &owner_sid, &group_sid, pal,
3347 SMB_ACL_TYPE_ACCESS);
3348
3349 /* We must have *some* ACLS. */
3350
3351 if (count_canon_ace_list(file_ace) == 0) {
3352 DEBUG(0,("get_nt_acl : No ACLs on file (%s) !\n", name));
3353 goto done;
3354 }
3355
3356 if (S_ISDIR(sbuf->st_ex_mode) && def_acl) {
3357 dir_ace = canonicalise_acl(conn, name, def_acl,
3358 sbuf,
3359 &global_sid_Creator_Owner,
3360 &global_sid_Creator_Group,
3361 pal, SMB_ACL_TYPE_DEFAULT);
3362 }
3363
3364 /*
3365 * Create the NT ACE list from the canonical ace lists.
3366 */
3367
3368 {
3369 canon_ace *ace;
3370 enum security_ace_type nt_acl_type;
3371
3372 if (nt4_compatible_acls() && dir_ace) {
3373 /*
3374 * NT 4 chokes if an ACL contains an INHERIT_ONLY entry
3375 * but no non-INHERIT_ONLY entry for one SID. So we only
3376 * remove entries from the Access ACL if the
3377 * corresponding Default ACL entries have also been
3378 * removed. ACEs for CREATOR-OWNER and CREATOR-GROUP
3379 * are exceptions. We can do nothing
3380 * intelligent if the Default ACL contains entries that
3381 * are not also contained in the Access ACL, so this
3382 * case will still fail under NT 4.
3383 */
3384
3385 ace = canon_ace_entry_for(dir_ace, SMB_ACL_OTHER, NULL);
3386 if (ace && !ace->perms) {
3387 DLIST_REMOVE(dir_ace, ace);
3388 TALLOC_FREE(ace);
3389
3390 ace = canon_ace_entry_for(file_ace, SMB_ACL_OTHER, NULL);
3391 if (ace && !ace->perms) {
3392 DLIST_REMOVE(file_ace, ace);
3393 TALLOC_FREE(ace);
3394 }
3395 }
3396
3397 /*
3398 * WinNT doesn't usually have Creator Group
3399 * in browse lists, so we send this entry to
3400 * WinNT even if it contains no relevant
3401 * permissions. Once we can add
3402 * Creator Group to browse lists we can
3403 * re-enable this.
3404 */
3405
3406 #if 0
3407 ace = canon_ace_entry_for(dir_ace, SMB_ACL_GROUP_OBJ, NULL);
3408 if (ace && !ace->perms) {
3409 DLIST_REMOVE(dir_ace, ace);
3410 TALLOC_FREE(ace);
3411 }
3412 #endif
3413
3414 ace = canon_ace_entry_for(file_ace, SMB_ACL_GROUP_OBJ, NULL);
3415 if (ace && !ace->perms) {
3416 DLIST_REMOVE(file_ace, ace);
3417 TALLOC_FREE(ace);
3418 }
3419 }
3420
3421 num_acls = count_canon_ace_list(file_ace);
3422 num_def_acls = count_canon_ace_list(dir_ace);
3423
3424 /* Allocate the ace list. */
3425 if ((nt_ace_list = talloc_array(talloc_tos(), struct security_ace,num_acls + num_profile_acls + num_def_acls)) == NULL) {
3426 DEBUG(0,("get_nt_acl: Unable to malloc space for nt_ace_list.\n"));
3427 goto done;
3428 }
3429
3430 memset(nt_ace_list, '\0', (num_acls + num_def_acls) * sizeof(struct security_ace) );
3431
3432 /*
3433 * Create the NT ACE list from the canonical ace lists.
3434 */
3435
3436 for (ace = file_ace; ace != NULL; ace = ace->next) {
3437 uint32_t acc = map_canon_ace_perms(SNUM(conn),
3438 &nt_acl_type,
3439 ace->perms,
3440 S_ISDIR(sbuf->st_ex_mode));
3441 init_sec_ace(&nt_ace_list[num_aces++],
3442 &ace->trustee,
3443 nt_acl_type,
3444 acc,
3445 ace->ace_flags);
3446 }
3447
3448 /* The User must have access to a profile share - even
3449 * if we can't map the SID. */
3450 if (lp_profile_acls(SNUM(conn))) {
3451 add_or_replace_ace(nt_ace_list, &num_aces,
3452 &global_sid_Builtin_Users,
3453 SEC_ACE_TYPE_ACCESS_ALLOWED,
3454 FILE_GENERIC_ALL, 0);
3455 }
3456
3457 for (ace = dir_ace; ace != NULL; ace = ace->next) {
3458 uint32_t acc = map_canon_ace_perms(SNUM(conn),
3459 &nt_acl_type,
3460 ace->perms,
3461 S_ISDIR(sbuf->st_ex_mode));
3462 init_sec_ace(&nt_ace_list[num_aces++],
3463 &ace->trustee,
3464 nt_acl_type,
3465 acc,
3466 ace->ace_flags |
3467 SEC_ACE_FLAG_OBJECT_INHERIT|
3468 SEC_ACE_FLAG_CONTAINER_INHERIT|
3469 SEC_ACE_FLAG_INHERIT_ONLY);
3470 }
3471
3472 /* The User must have access to a profile share - even
3473 * if we can't map the SID. */
3474 if (lp_profile_acls(SNUM(conn))) {
3475 add_or_replace_ace(nt_ace_list, &num_aces,
3476 &global_sid_Builtin_Users,
3477 SEC_ACE_TYPE_ACCESS_ALLOWED,
3478 FILE_GENERIC_ALL,
3479 SEC_ACE_FLAG_OBJECT_INHERIT |
3480 SEC_ACE_FLAG_CONTAINER_INHERIT |
3481 SEC_ACE_FLAG_INHERIT_ONLY);
3482 }
3483
3484 /*
3485 * Merge POSIX default ACLs and normal ACLs into one NT ACE.
3486 * Win2K needs this to get the inheritance correct when replacing ACLs
3487 * on a directory tree. Based on work by Jim @ IBM.
3488 */
3489
3490 num_aces = merge_default_aces(nt_ace_list, num_aces);
3491
3492 if (lp_profile_acls(SNUM(conn))) {
3493 for (i = 0; i < num_aces; i++) {
3494 if (dom_sid_equal(&nt_ace_list[i].trustee, &owner_sid)) {
3495 add_or_replace_ace(nt_ace_list, &num_aces,
3496 &orig_owner_sid,
3497 nt_ace_list[i].type,
3498 nt_ace_list[i].access_mask,
3499 nt_ace_list[i].flags);
3500 break;
3501 }
3502 }
3503 }
3504 }
3505
3506 if (num_aces) {
3507 if((psa = make_sec_acl( talloc_tos(), NT4_ACL_REVISION, num_aces, nt_ace_list)) == NULL) {
3508 DEBUG(0,("get_nt_acl: Unable to malloc space for acl.\n"));
3509 goto done;
3510 }
3511 }
3512 } /* security_info & SECINFO_DACL */
3513
3514 psd = make_standard_sec_desc( talloc_tos(),
3515 (security_info & SECINFO_OWNER) ? &owner_sid : NULL,
3516 (security_info & SECINFO_GROUP) ? &group_sid : NULL,
3517 psa,
3518 &sd_size);
3519
3520 if(!psd) {
3521 DEBUG(0,("get_nt_acl: Unable to malloc space for security descriptor.\n"));
3522 sd_size = 0;
3523 goto done;
3524 }
3525
3526 /*
3527 * Windows 2000: The DACL_PROTECTED flag in the security
3528 * descriptor marks the ACL as non-inheriting, i.e., no
3529 * ACEs from higher level directories propagate to this
3530 * ACL. In the POSIX ACL model permissions are only
3531 * inherited at file create time, so ACLs never contain
3532 * any ACEs that are inherited dynamically. The DACL_PROTECTED
3533 * flag doesn't seem to bother Windows NT.
3534 * Always set this if map acl inherit is turned off.
3535 */
3536 if (pal == NULL || !lp_map_acl_inherit(SNUM(conn))) {
3537 psd->type |= SEC_DESC_DACL_PROTECTED;
3538 } else {
3539 psd->type |= pal->sd_type;
3540 }
3541
3542 if (psd->dacl) {
3543 dacl_sort_into_canonical_order(psd->dacl->aces, (unsigned int)psd->dacl->num_aces);
3544 }
3545
3546 *ppdesc = psd;
3547
3548 done:
3549
3550 if (posix_acl) {
3551 TALLOC_FREE(posix_acl);
3552 }
3553 if (def_acl) {
3554 TALLOC_FREE(def_acl);
3555 }
3556 free_canon_ace_list(file_ace);
3557 free_canon_ace_list(dir_ace);
3558 free_inherited_info(pal);
3559 TALLOC_FREE(nt_ace_list);
3560
3561 return NT_STATUS_OK;
3562 }
3563
3564 NTSTATUS posix_fget_nt_acl(struct files_struct *fsp, uint32_t security_info,
3565 struct security_descriptor **ppdesc)
3566 {
3567 SMB_STRUCT_STAT sbuf;
3568 SMB_ACL_T posix_acl = NULL;
3569 struct pai_val *pal;
3570
3571 *ppdesc = NULL;
3572
3573 DEBUG(10,("posix_fget_nt_acl: called for file %s\n",
3574 fsp_str_dbg(fsp)));
3575
3576 /* can it happen that fsp_name == NULL ? */
3577 if (fsp->is_directory || fsp->fh->fd == -1) {
3578 return posix_get_nt_acl(fsp->conn, fsp->fsp_name->base_name,
3579 security_info, ppdesc);
3580 }
3581
3582 /* Get the stat struct for the owner info. */
3583 if(SMB_VFS_FSTAT(fsp, &sbuf) != 0) {
3584 return map_nt_error_from_unix(errno);
3585 }
3586
3587 /* Get the ACL from the fd. */
3588 posix_acl = SMB_VFS_SYS_ACL_GET_FD(fsp);
3589
3590 pal = fload_inherited_info(fsp);
3591
3592 return posix_get_nt_acl_common(fsp->conn, fsp->fsp_name->base_name,
3593 &sbuf, pal, posix_acl, NULL,
3594 security_info, ppdesc);
3595 }
3596
3597 NTSTATUS posix_get_nt_acl(struct connection_struct *conn, const char *name,
3598 uint32_t security_info, struct security_descriptor **ppdesc)
3599 {
3600 SMB_ACL_T posix_acl = NULL;
3601 SMB_ACL_T def_acl = NULL;
3602 struct pai_val *pal;
3603 struct smb_filename smb_fname;
3604 int ret;
3605
3606 *ppdesc = NULL;
3607
3608 DEBUG(10,("posix_get_nt_acl: called for file %s\n", name ));
3609
3610 ZERO_STRUCT(smb_fname);
3611 smb_fname.base_name = discard_const_p(char, name);
3612
3613 /* Get the stat struct for the owner info. */
3614 if (lp_posix_pathnames()) {
3615 ret = SMB_VFS_LSTAT(conn, &smb_fname);
3616 } else {
3617 ret = SMB_VFS_STAT(conn, &smb_fname);
3618 }
3619
3620 if (ret == -1) {
3621 return map_nt_error_from_unix(errno);
3622 }
3623
3624 /* Get the ACL from the path. */
3625 posix_acl = SMB_VFS_SYS_ACL_GET_FILE(conn, name, SMB_ACL_TYPE_ACCESS);
3626
3627 /* If it's a directory get the default POSIX ACL. */
3628 if(S_ISDIR(smb_fname.st.st_ex_mode)) {
3629 def_acl = SMB_VFS_SYS_ACL_GET_FILE(conn, name, SMB_ACL_TYPE_DEFAULT);
3630 def_acl = free_empty_sys_acl(conn, def_acl);
3631 }
3632
3633 pal = load_inherited_info(conn, name);
3634
3635 return posix_get_nt_acl_common(conn, name, &smb_fname.st, pal,
3636 posix_acl, def_acl, security_info,
3637 ppdesc);
3638 }
3639
3640 /****************************************************************************
3641 Try to chown a file. We will be able to chown it under the following conditions.
3642
3643 1) If we have root privileges, then it will just work.
3644 2) If we have SeRestorePrivilege we can change the user + group to any other user.
3645 3) If we have SeTakeOwnershipPrivilege we can change the user to the current user.
3646 4) If we have write permission to the file and dos_filemodes is set
3647 then allow chown to the currently authenticated user.
3648 ****************************************************************************/
3649
3650 NTSTATUS try_chown(files_struct *fsp, uid_t uid, gid_t gid)
3651 {
3652 NTSTATUS status;
3653
3654 if(!CAN_WRITE(fsp->conn)) {
3655 return NT_STATUS_MEDIA_WRITE_PROTECTED;
3656 }
3657
3658 /* Case (1). */
3659 status = vfs_chown_fsp(fsp, uid, gid);
3660 if (NT_STATUS_IS_OK(status)) {
3661 return status;
3662 }
3663
3664 /* Case (2) / (3) */
3665 if (lp_enable_privileges()) {
3666 bool has_take_ownership_priv = security_token_has_privilege(
3667 get_current_nttok(fsp->conn),
3668 SEC_PRIV_TAKE_OWNERSHIP);
3669 bool has_restore_priv = security_token_has_privilege(
3670 get_current_nttok(fsp->conn),
3671 SEC_PRIV_RESTORE);
3672
3673 if (has_restore_priv) {
3674 ; /* Case (2) */
3675 } else if (has_take_ownership_priv) {
3676 /* Case (3) */
3677 if (uid == get_current_uid(fsp->conn)) {
3678 gid = (gid_t)-1;
3679 } else {
3680 has_take_ownership_priv = false;
3681 }
3682 }
3683
3684 if (has_take_ownership_priv || has_restore_priv) {
3685 become_root();
3686 status = vfs_chown_fsp(fsp, uid, gid);
3687 unbecome_root();
3688 return status;
3689 }
3690 }
3691
3692 /* Case (4). */
3693 if (!lp_dos_filemode(SNUM(fsp->conn))) {
3694 return NT_STATUS_ACCESS_DENIED;
3695 }
3696
3697 /* only allow chown to the current user. This is more secure,
3698 and also copes with the case where the SID in a take ownership ACL is
3699 a local SID on the users workstation
3700 */
3701 if (uid != get_current_uid(fsp->conn)) {
3702 return NT_STATUS_ACCESS_DENIED;
3703 }
3704
3705 become_root();
3706 /* Keep the current file gid the same. */
3707 status = vfs_chown_fsp(fsp, uid, (gid_t)-1);
3708 unbecome_root();
3709
3710 return status;
3711 }
3712
3713 #if 0
3714 /* Disable this - prevents ACL inheritance from the ACL editor. JRA. */
3715
3716 /****************************************************************************
3717 Take care of parent ACL inheritance.
3718 ****************************************************************************/
3719
3720 NTSTATUS append_parent_acl(files_struct *fsp,
3721 const struct security_descriptor *pcsd,
3722 struct security_descriptor **pp_new_sd)
3723 {
3724 struct smb_filename *smb_dname = NULL;
3725 struct security_descriptor *parent_sd = NULL;
3726 files_struct *parent_fsp = NULL;
3727 TALLOC_CTX *mem_ctx = talloc_tos();
3728 char *parent_name = NULL;
3729 struct security_ace *new_ace = NULL;
3730 unsigned int num_aces = pcsd->dacl->num_aces;
3731 NTSTATUS status;
3732 int info;
3733 unsigned int i, j;
3734 struct security_descriptor *psd = dup_sec_desc(talloc_tos(), pcsd);
3735 bool is_dacl_protected = (pcsd->type & SEC_DESC_DACL_PROTECTED);
3736
3737 if (psd == NULL) {
3738 return NT_STATUS_NO_MEMORY;
3739 }
3740
3741 if (!parent_dirname(mem_ctx, fsp->fsp_name->base_name, &parent_name,
3742 NULL)) {
3743 return NT_STATUS_NO_MEMORY;
3744 }
3745
3746 status = create_synthetic_smb_fname(mem_ctx, parent_name, NULL, NULL,
3747 &smb_dname);
3748 if (!NT_STATUS_IS_OK(status)) {
3749 goto fail;
3750 }
3751
3752 status = SMB_VFS_CREATE_FILE(
3753 fsp->conn, /* conn */
3754 NULL, /* req */
3755 0, /* root_dir_fid */
3756 smb_dname, /* fname */
3757 FILE_READ_ATTRIBUTES, /* access_mask */
3758 FILE_SHARE_NONE, /* share_access */
3759 FILE_OPEN, /* create_disposition*/
3760 FILE_DIRECTORY_FILE, /* create_options */
3761 0, /* file_attributes */
3762 INTERNAL_OPEN_ONLY, /* oplock_request */
3763 0, /* allocation_size */
3764 NULL, /* sd */
3765 NULL, /* ea_list */
3766 &parent_fsp, /* result */
3767 &info); /* pinfo */
3768
3769 if (!NT_STATUS_IS_OK(status)) {
3770 TALLOC_FREE(smb_dname);
3771 return status;
3772 }
3773
3774 status = SMB_VFS_GET_NT_ACL(parent_fsp->conn, smb_dname->base_name,
3775 SECINFO_DACL, &parent_sd );
3776
3777 close_file(NULL, parent_fsp, NORMAL_CLOSE);
3778 TALLOC_FREE(smb_dname);
3779
3780 if (!NT_STATUS_IS_OK(status)) {
3781 return status;
3782 }
3783
3784 /*
3785 * Make room for potentially all the ACLs from
3786 * the parent. We used to add the ugw triple here,
3787 * as we knew we were dealing with POSIX ACLs.
3788 * We no longer need to do so as we can guarentee
3789 * that a default ACL from the parent directory will
3790 * be well formed for POSIX ACLs if it came from a
3791 * POSIX ACL source, and if we're not writing to a
3792 * POSIX ACL sink then we don't care if it's not well
3793 * formed. JRA.
3794 */
3795
3796 num_aces += parent_sd->dacl->num_aces;
3797
3798 if((new_ace = talloc_zero_array(mem_ctx, struct security_ace,
3799 num_aces)) == NULL) {
3800 return NT_STATUS_NO_MEMORY;
3801 }
3802
3803 /* Start by copying in all the given ACE entries. */
3804 for (i = 0; i < psd->dacl->num_aces; i++) {
3805 sec_ace_copy(&new_ace[i], &psd->dacl->aces[i]);
3806 }
3807
3808 /*
3809 * Note that we're ignoring "inherit permissions" here
3810 * as that really only applies to newly created files. JRA.
3811 */
3812
3813 /* Finally append any inherited ACEs. */
3814 for (j = 0; j < parent_sd->dacl->num_aces; j++) {
3815 struct security_ace *se = &parent_sd->dacl->aces[j];
3816
3817 if (fsp->is_directory) {
3818 if (!(se->flags & SEC_ACE_FLAG_CONTAINER_INHERIT)) {
3819 /* Doesn't apply to a directory - ignore. */
3820 DEBUG(10,("append_parent_acl: directory %s "
3821 "ignoring non container "
3822 "inherit flags %u on ACE with sid %s "
3823 "from parent %s\n",
3824 fsp_str_dbg(fsp),
3825 (unsigned int)se->flags,
3826 sid_string_dbg(&se->trustee),
3827 parent_name));
3828 continue;
3829 }
3830 } else {
3831 if (!(se->flags & SEC_ACE_FLAG_OBJECT_INHERIT)) {
3832 /* Doesn't apply to a file - ignore. */
3833 DEBUG(10,("append_parent_acl: file %s "
3834 "ignoring non object "
3835 "inherit flags %u on ACE with sid %s "
3836 "from parent %s\n",
3837 fsp_str_dbg(fsp),
3838 (unsigned int)se->flags,
3839 sid_string_dbg(&se->trustee),
3840 parent_name));
3841 continue;
3842 }
3843 }
3844
3845 if (is_dacl_protected) {
3846 /* If the DACL is protected it means we must
3847 * not overwrite an existing ACE entry with the
3848 * same SID. This is order N^2. Ouch :-(. JRA. */
3849 unsigned int k;
3850 for (k = 0; k < psd->dacl->num_aces; k++) {
3851 if (dom_sid_equal(&psd->dacl->aces[k].trustee,
3852 &se->trustee)) {
3853 break;
3854 }
3855 }
3856 if (k < psd->dacl->num_aces) {
3857 /* SID matched. Ignore. */
3858 DEBUG(10,("append_parent_acl: path %s "
3859 "ignoring ACE with protected sid %s "
3860 "from parent %s\n",
3861 fsp_str_dbg(fsp),
3862 sid_string_dbg(&se->trustee),
3863 parent_name));
3864 continue;
3865 }
3866 }
3867
3868 sec_ace_copy(&new_ace[i], se);
3869 if (se->flags & SEC_ACE_FLAG_NO_PROPAGATE_INHERIT) {
3870 new_ace[i].flags &= ~(SEC_ACE_FLAG_VALID_INHERIT);
3871 }
3872 new_ace[i].flags |= SEC_ACE_FLAG_INHERITED_ACE;
3873
3874 if (fsp->is_directory) {
3875 /*
3876 * Strip off any inherit only. It's applied.
3877 */
3878 new_ace[i].flags &= ~(SEC_ACE_FLAG_INHERIT_ONLY);
3879 if (se->flags & SEC_ACE_FLAG_NO_PROPAGATE_INHERIT) {
3880 /* No further inheritance. */
3881 new_ace[i].flags &=
3882 ~(SEC_ACE_FLAG_CONTAINER_INHERIT|
3883 SEC_ACE_FLAG_OBJECT_INHERIT);
3884 }
3885 } else {
3886 /*
3887 * Strip off any container or inherit
3888 * flags, they can't apply to objects.
3889 */
3890 new_ace[i].flags &= ~(SEC_ACE_FLAG_CONTAINER_INHERIT|
3891 SEC_ACE_FLAG_INHERIT_ONLY|
3892 SEC_ACE_FLAG_NO_PROPAGATE_INHERIT);
3893 }
3894 i++;
3895
3896 DEBUG(10,("append_parent_acl: path %s "
3897 "inheriting ACE with sid %s "
3898 "from parent %s\n",
3899 fsp_str_dbg(fsp),
3900 sid_string_dbg(&se->trustee),
3901 parent_name));
3902 }
3903
3904 psd->dacl->aces = new_ace;
3905 psd->dacl->num_aces = i;
3906 psd->type &= ~(SEC_DESC_DACL_AUTO_INHERITED|
3907 SEC_DESC_DACL_AUTO_INHERIT_REQ);
3908
3909 *pp_new_sd = psd;
3910 return status;
3911 }
3912 #endif
3913
3914 /****************************************************************************
3915 Reply to set a security descriptor on an fsp. security_info_sent is the
3916 description of the following NT ACL.
3917 This should be the only external function needed for the UNIX style set ACL.
3918 We make a copy of psd_orig as internal functions modify the elements inside
3919 it, even though it's a const pointer.
3920 ****************************************************************************/
3921
3922 NTSTATUS set_nt_acl(files_struct *fsp, uint32 security_info_sent, const struct security_descriptor *psd_orig)
3923 {
3924 connection_struct *conn = fsp->conn;
3925 uid_t user = (uid_t)-1;
3926 gid_t grp = (gid_t)-1;
3927 struct dom_sid file_owner_sid;
3928 struct dom_sid file_grp_sid;
3929 canon_ace *file_ace_list = NULL;
3930 canon_ace *dir_ace_list = NULL;
3931 bool acl_perms = False;
3932 mode_t orig_mode = (mode_t)0;
3933 NTSTATUS status;
3934 bool set_acl_as_root = false;
3935 bool acl_set_support = false;
3936 bool ret = false;
3937 struct security_descriptor *psd = NULL;
3938
3939 DEBUG(10,("set_nt_acl: called for file %s\n",
3940 fsp_str_dbg(fsp)));
3941
3942 if (!CAN_WRITE(conn)) {
3943 DEBUG(10,("set acl rejected on read-only share\n"));
3944 return NT_STATUS_MEDIA_WRITE_PROTECTED;
3945 }
3946
3947 if (!psd_orig) {
3948 return NT_STATUS_INVALID_PARAMETER;
3949 }
3950
3951 psd = dup_sec_desc(talloc_tos(), psd_orig);
3952 if (!psd) {
3953 return NT_STATUS_NO_MEMORY;
3954 }
3955
3956 /*
3957 * Get the current state of the file.
3958 */
3959
3960 status = vfs_stat_fsp(fsp);
3961 if (!NT_STATUS_IS_OK(status)) {
3962 return status;
3963 }
3964
3965 /* Save the original element we check against. */
3966 orig_mode = fsp->fsp_name->st.st_ex_mode;
3967
3968 /*
3969 * Unpack the user/group/world id's.
3970 */
3971
3972 /* POSIX can't cope with missing owner/group. */
3973 if ((security_info_sent & SECINFO_OWNER) && (psd->owner_sid == NULL)) {
3974 security_info_sent &= ~SECINFO_OWNER;
3975 }
3976 if ((security_info_sent & SECINFO_GROUP) && (psd->group_sid == NULL)) {
3977 security_info_sent &= ~SECINFO_GROUP;
3978 }
3979
3980 status = unpack_nt_owners( conn, &user, &grp, security_info_sent, psd);
3981 if (!NT_STATUS_IS_OK(status)) {
3982 return status;
3983 }
3984
3985 /*
3986 * Do we need to chown ? If so this must be done first as the incoming
3987 * CREATOR_OWNER acl will be relative to the *new* owner, not the old.
3988 * Noticed by Simo.
3989 */
3990
3991 if (((user != (uid_t)-1) && (fsp->fsp_name->st.st_ex_uid != user)) ||
3992 (( grp != (gid_t)-1) && (fsp->fsp_name->st.st_ex_gid != grp))) {
3993
3994 DEBUG(3,("set_nt_acl: chown %s. uid = %u, gid = %u.\n",
3995 fsp_str_dbg(fsp), (unsigned int)user,
3996 (unsigned int)grp));
3997
3998 status = try_chown(fsp, user, grp);
3999 if(!NT_STATUS_IS_OK(status)) {
4000 DEBUG(3,("set_nt_acl: chown %s, %u, %u failed. Error "
4001 "= %s.\n", fsp_str_dbg(fsp),
4002 (unsigned int)user,
4003 (unsigned int)grp,
4004 nt_errstr(status)));
4005 return status;
4006 }
4007
4008 /*
4009 * Recheck the current state of the file, which may have changed.
4010 * (suid/sgid bits, for instance)
4011 */
4012
4013 status = vfs_stat_fsp(fsp);
4014 if (!NT_STATUS_IS_OK(status)) {
4015 return status;
4016 }
4017
4018 /* Save the original element we check against. */
4019 orig_mode = fsp->fsp_name->st.st_ex_mode;
4020
4021 /* If we successfully chowned, we know we must
4022 * be able to set the acl, so do it as root.
4023 */
4024 set_acl_as_root = true;
4025 }
4026
4027 create_file_sids(&fsp->fsp_name->st, &file_owner_sid, &file_grp_sid);
4028
4029 if((security_info_sent & SECINFO_DACL) &&
4030 (psd->type & SEC_DESC_DACL_PRESENT) &&
4031 (psd->dacl == NULL)) {
4032 struct security_ace ace[3];
4033
4034 /* We can't have NULL DACL in POSIX.
4035 Use owner/group/Everyone -> full access. */
4036
4037 init_sec_ace(&ace[0],
4038 &file_owner_sid,
4039 SEC_ACE_TYPE_ACCESS_ALLOWED,
4040 GENERIC_ALL_ACCESS,
4041 0);
4042 init_sec_ace(&ace[1],
4043 &file_grp_sid,
4044 SEC_ACE_TYPE_ACCESS_ALLOWED,
4045 GENERIC_ALL_ACCESS,
4046 0);
4047 init_sec_ace(&ace[2],
4048 &global_sid_World,
4049 SEC_ACE_TYPE_ACCESS_ALLOWED,
4050 GENERIC_ALL_ACCESS,
4051 0);
4052 psd->dacl = make_sec_acl(talloc_tos(),
4053 NT4_ACL_REVISION,
4054 3,
4055 ace);
4056 if (psd->dacl == NULL) {
4057 return NT_STATUS_NO_MEMORY;
4058 }
4059 security_acl_map_generic(psd->dacl, &file_generic_mapping);
4060 }
4061
4062 acl_perms = unpack_canon_ace(fsp, &fsp->fsp_name->st, &file_owner_sid,
4063 &file_grp_sid, &file_ace_list,
4064 &dir_ace_list, security_info_sent, psd);
4065
4066 /* Ignore W2K traverse DACL set. */
4067 if (!file_ace_list && !dir_ace_list) {
4068 return NT_STATUS_OK;
4069 }
4070
4071 if (!acl_perms) {
4072 DEBUG(3,("set_nt_acl: cannot set permissions\n"));
4073 free_canon_ace_list(file_ace_list);
4074 free_canon_ace_list(dir_ace_list);
4075 return NT_STATUS_ACCESS_DENIED;
4076 }
4077
4078 /*
4079 * Only change security if we got a DACL.
4080 */
4081
4082 if(!(security_info_sent & SECINFO_DACL) || (psd->dacl == NULL)) {
4083 free_canon_ace_list(file_ace_list);
4084 free_canon_ace_list(dir_ace_list);
4085 return NT_STATUS_OK;
4086 }
4087
4088 /*
4089 * Try using the POSIX ACL set first. Fall back to chmod if
4090 * we have no ACL support on this filesystem.
4091 */
4092
4093 if (acl_perms && file_ace_list) {
4094 if (set_acl_as_root) {
4095 become_root();
4096 }
4097 ret = set_canon_ace_list(fsp, file_ace_list, false,
4098 &fsp->fsp_name->st, &acl_set_support);
4099 if (set_acl_as_root) {
4100 unbecome_root();
4101 }
4102 if (acl_set_support && ret == false) {
4103 DEBUG(3,("set_nt_acl: failed to set file acl on file "
4104 "%s (%s).\n", fsp_str_dbg(fsp),
4105 strerror(errno)));
4106 free_canon_ace_list(file_ace_list);
4107 free_canon_ace_list(dir_ace_list);
4108 return map_nt_error_from_unix(errno);
4109 }
4110 }
4111
4112 if (acl_perms && acl_set_support && fsp->is_directory) {
4113 if (dir_ace_list) {
4114 if (set_acl_as_root) {
4115 become_root();
4116 }
4117 ret = set_canon_ace_list(fsp, dir_ace_list, true,
4118 &fsp->fsp_name->st,
4119 &acl_set_support);
4120 if (set_acl_as_root) {
4121 unbecome_root();
4122 }
4123 if (ret == false) {
4124 DEBUG(3,("set_nt_acl: failed to set default "
4125 "acl on directory %s (%s).\n",
4126 fsp_str_dbg(fsp), strerror(errno)));
4127 free_canon_ace_list(file_ace_list);
4128 free_canon_ace_list(dir_ace_list);
4129 return map_nt_error_from_unix(errno);
4130 }
4131 } else {
4132 int sret = -1;
4133
4134 /*
4135 * No default ACL - delete one if it exists.
4136 */
4137
4138 if (set_acl_as_root) {
4139 become_root();
4140 }
4141 sret = SMB_VFS_SYS_ACL_DELETE_DEF_FILE(conn,
4142 fsp->fsp_name->base_name);
4143 if (set_acl_as_root) {
4144 unbecome_root();
4145 }
4146 if (sret == -1) {
4147 if (acl_group_override(conn, fsp->fsp_name)) {
4148 DEBUG(5,("set_nt_acl: acl group "
4149 "control on and current user "
4150 "in file %s primary group. "
4151 "Override delete_def_acl\n",
4152 fsp_str_dbg(fsp)));
4153
4154 become_root();
4155 sret =
4156 SMB_VFS_SYS_ACL_DELETE_DEF_FILE(
4157 conn,
4158 fsp->fsp_name->base_name);
4159 unbecome_root();
4160 }
4161
4162 if (sret == -1) {
4163 DEBUG(3,("set_nt_acl: sys_acl_delete_def_file failed (%s)\n", strerror(errno)));
4164 free_canon_ace_list(file_ace_list);
4165 free_canon_ace_list(dir_ace_list);
4166 return map_nt_error_from_unix(errno);
4167 }
4168 }
4169 }
4170 }
4171
4172 if (acl_set_support) {
4173 if (set_acl_as_root) {
4174 become_root();
4175 }
4176 store_inheritance_attributes(fsp,
4177 file_ace_list,
4178 dir_ace_list,
4179 psd->type);
4180 if (set_acl_as_root) {
4181 unbecome_root();
4182 }
4183 }
4184
4185 /*
4186 * If we cannot set using POSIX ACLs we fall back to checking if we need to chmod.
4187 */
4188
4189 if(!acl_set_support && acl_perms) {
4190 mode_t posix_perms;
4191
4192 if (!convert_canon_ace_to_posix_perms( fsp, file_ace_list, &posix_perms)) {
4193 free_canon_ace_list(file_ace_list);
4194 free_canon_ace_list(dir_ace_list);
4195 DEBUG(3,("set_nt_acl: failed to convert file acl to "
4196 "posix permissions for file %s.\n",
4197 fsp_str_dbg(fsp)));
4198 return NT_STATUS_ACCESS_DENIED;
4199 }
4200
4201 if (orig_mode != posix_perms) {
4202 int sret = -1;
4203
4204 DEBUG(3,("set_nt_acl: chmod %s. perms = 0%o.\n",
4205 fsp_str_dbg(fsp), (unsigned int)posix_perms));
4206
4207 if (set_acl_as_root) {
4208 become_root();
4209 }
4210 sret = SMB_VFS_CHMOD(conn, fsp->fsp_name->base_name,
4211 posix_perms);
4212 if (set_acl_as_root) {
4213 unbecome_root();
4214 }
4215 if(sret == -1) {
4216 if (acl_group_override(conn, fsp->fsp_name)) {
4217 DEBUG(5,("set_nt_acl: acl group "
4218 "control on and current user "
4219 "in file %s primary group. "
4220 "Override chmod\n",
4221 fsp_str_dbg(fsp)));
4222
4223 become_root();
4224 sret = SMB_VFS_CHMOD(conn,
4225 fsp->fsp_name->base_name,
4226 posix_perms);
4227 unbecome_root();
4228 }
4229
4230 if (sret == -1) {
4231 DEBUG(3,("set_nt_acl: chmod %s, 0%o "
4232 "failed. Error = %s.\n",
4233 fsp_str_dbg(fsp),
4234 (unsigned int)posix_perms,
4235 strerror(errno)));
4236 free_canon_ace_list(file_ace_list);
4237 free_canon_ace_list(dir_ace_list);
4238 return map_nt_error_from_unix(errno);
4239 }
4240 }
4241 }
4242 }
4243
4244 free_canon_ace_list(file_ace_list);
4245 free_canon_ace_list(dir_ace_list);
4246
4247 /* Ensure the stat struct in the fsp is correct. */
4248 status = vfs_stat_fsp(fsp);
4249
4250 return NT_STATUS_OK;
4251 }
4252
4253 /****************************************************************************
4254 Get the actual group bits stored on a file with an ACL. Has no effect if
4255 the file has no ACL. Needed in dosmode code where the stat() will return
4256 the mask bits, not the real group bits, for a file with an ACL.
4257 ****************************************************************************/
4258
4259 int get_acl_group_bits( connection_struct *conn, const char *fname, mode_t *mode )
4260 {
4261 int entry_id = SMB_ACL_FIRST_ENTRY;
4262 SMB_ACL_ENTRY_T entry;
4263 SMB_ACL_T posix_acl;
4264 int result = -1;
4265
4266 posix_acl = SMB_VFS_SYS_ACL_GET_FILE(conn, fname, SMB_ACL_TYPE_ACCESS);
4267 if (posix_acl == (SMB_ACL_T)NULL)
4268 return -1;
4269
4270 while (sys_acl_get_entry(posix_acl, entry_id, &entry) == 1) {
4271 SMB_ACL_TAG_T tagtype;
4272 SMB_ACL_PERMSET_T permset;
4273
4274 entry_id = SMB_ACL_NEXT_ENTRY;
4275
4276 if (sys_acl_get_tag_type(entry, &tagtype) ==-1)
4277 break;
4278
4279 if (tagtype == SMB_ACL_GROUP_OBJ) {
4280 if (sys_acl_get_permset(entry, &permset) == -1) {
4281 break;
4282 } else {
4283 *mode &= ~(S_IRGRP|S_IWGRP|S_IXGRP);
4284 *mode |= (sys_acl_get_perm(permset, SMB_ACL_READ) ? S_IRGRP : 0);
4285 *mode |= (sys_acl_get_perm(permset, SMB_ACL_WRITE) ? S_IWGRP : 0);
4286 *mode |= (sys_acl_get_perm(permset, SMB_ACL_EXECUTE) ? S_IXGRP : 0);
4287 result = 0;
4288 break;
4289 }
4290 }
4291 }
4292 TALLOC_FREE(posix_acl);
4293 return result;
4294 }
4295
4296 /****************************************************************************
4297 Do a chmod by setting the ACL USER_OBJ, GROUP_OBJ and OTHER bits in an ACL
4298 and set the mask to rwx. Needed to preserve complex ACLs set by NT.
4299 ****************************************************************************/
4300
4301 static int chmod_acl_internals( connection_struct *conn, SMB_ACL_T posix_acl, mode_t mode)
4302 {
4303 int entry_id = SMB_ACL_FIRST_ENTRY;
4304 SMB_ACL_ENTRY_T entry;
4305 int num_entries = 0;
4306
4307 while ( sys_acl_get_entry(posix_acl, entry_id, &entry) == 1) {
4308 SMB_ACL_TAG_T tagtype;
4309 SMB_ACL_PERMSET_T permset;
4310 mode_t perms;
4311
4312 entry_id = SMB_ACL_NEXT_ENTRY;
4313
4314 if (sys_acl_get_tag_type(entry, &tagtype) == -1)
4315 return -1;
4316
4317 if (sys_acl_get_permset(entry, &permset) == -1)
4318 return -1;
4319
4320 num_entries++;
4321
4322 switch(tagtype) {
4323 case SMB_ACL_USER_OBJ:
4324 perms = unix_perms_to_acl_perms(mode, S_IRUSR, S_IWUSR, S_IXUSR);
4325 break;
4326 case SMB_ACL_GROUP_OBJ:
4327 perms = unix_perms_to_acl_perms(mode, S_IRGRP, S_IWGRP, S_IXGRP);
4328 break;
4329 case SMB_ACL_MASK:
4330 /*
4331 * FIXME: The ACL_MASK entry permissions should really be set to
4332 * the union of the permissions of all ACL_USER,
4333 * ACL_GROUP_OBJ, and ACL_GROUP entries. That's what
4334 * acl_calc_mask() does, but Samba ACLs doesn't provide it.
4335 */
4336 perms = S_IRUSR|S_IWUSR|S_IXUSR;
4337 break;
4338 case SMB_ACL_OTHER:
4339 perms = unix_perms_to_acl_perms(mode, S_IROTH, S_IWOTH, S_IXOTH);
4340 break;
4341 default:
4342 continue;
4343 }
4344
4345 if (map_acl_perms_to_permset(conn, perms, &permset) == -1)
4346 return -1;
4347
4348 if (sys_acl_set_permset(entry, permset) == -1)
4349 return -1;
4350 }
4351
4352 /*
4353 * If this is a simple 3 element ACL or no elements then it's a standard
4354 * UNIX permission set. Just use chmod...
4355 */
4356
4357 if ((num_entries == 3) || (num_entries == 0))
4358 return -1;
4359
4360 return 0;
4361 }
4362
4363 /****************************************************************************
4364 Get the access ACL of FROM, do a chmod by setting the ACL USER_OBJ,
4365 GROUP_OBJ and OTHER bits in an ACL and set the mask to rwx. Set the
4366 resulting ACL on TO. Note that name is in UNIX character set.
4367 ****************************************************************************/
4368
4369 static int copy_access_posix_acl(connection_struct *conn, const char *from, const char *to, mode_t mode)
4370 {
4371 SMB_ACL_T posix_acl = NULL;
4372 int ret = -1;
4373
4374 if ((posix_acl = SMB_VFS_SYS_ACL_GET_FILE(conn, from, SMB_ACL_TYPE_ACCESS)) == NULL)
4375 return -1;
4376
4377 if ((ret = chmod_acl_internals(conn, posix_acl, mode)) == -1)
4378 goto done;
4379
4380 ret = SMB_VFS_SYS_ACL_SET_FILE(conn, to, SMB_ACL_TYPE_ACCESS, posix_acl);
4381
4382 done:
4383
4384 TALLOC_FREE(posix_acl);
4385 return ret;
4386 }
4387
4388 /****************************************************************************
4389 Do a chmod by setting the ACL USER_OBJ, GROUP_OBJ and OTHER bits in an ACL
4390 and set the mask to rwx. Needed to preserve complex ACLs set by NT.
4391 Note that name is in UNIX character set.
4392 ****************************************************************************/
4393
4394 int chmod_acl(connection_struct *conn, const char *name, mode_t mode)
4395 {
4396 return copy_access_posix_acl(conn, name, name, mode);
4397 }
4398
4399 /****************************************************************************
4400 Check for an existing default POSIX ACL on a directory.
4401 ****************************************************************************/
4402
4403 static bool directory_has_default_posix_acl(connection_struct *conn, const char *fname)
4404 {
4405 SMB_ACL_T def_acl = SMB_VFS_SYS_ACL_GET_FILE( conn, fname, SMB_ACL_TYPE_DEFAULT);
4406 bool has_acl = False;
4407 SMB_ACL_ENTRY_T entry;
4408
4409 if (def_acl != NULL && (sys_acl_get_entry(def_acl, SMB_ACL_FIRST_ENTRY, &entry) == 1)) {
4410 has_acl = True;
4411 }
4412
4413 if (def_acl) {
4414 TALLOC_FREE(def_acl);
4415 }
4416 return has_acl;
4417 }
4418
4419 /****************************************************************************
4420 If the parent directory has no default ACL but it does have an Access ACL,
4421 inherit this Access ACL to file name.
4422 ****************************************************************************/
4423
4424 int inherit_access_posix_acl(connection_struct *conn, const char *inherit_from_dir,
4425 const char *name, mode_t mode)
4426 {
4427 if (directory_has_default_posix_acl(conn, inherit_from_dir))
4428 return 0;
4429
4430 return copy_access_posix_acl(conn, inherit_from_dir, name, mode);
4431 }
4432
4433 /****************************************************************************
4434 Do an fchmod by setting the ACL USER_OBJ, GROUP_OBJ and OTHER bits in an ACL
4435 and set the mask to rwx. Needed to preserve complex ACLs set by NT.
4436 ****************************************************************************/
4437
4438 int fchmod_acl(files_struct *fsp, mode_t mode)
4439 {
4440 connection_struct *conn = fsp->conn;
4441 SMB_ACL_T posix_acl = NULL;
4442 int ret = -1;
4443
4444 if ((posix_acl = SMB_VFS_SYS_ACL_GET_FD(fsp)) == NULL)
4445 return -1;
4446
4447 if ((ret = chmod_acl_internals(conn, posix_acl, mode)) == -1)
4448 goto done;
4449
4450 ret = SMB_VFS_SYS_ACL_SET_FD(fsp, posix_acl);
4451
4452 done:
4453
4454 TALLOC_FREE(posix_acl);
4455 return ret;
4456 }
4457
4458 /****************************************************************************
4459 Map from wire type to permset.
4460 ****************************************************************************/
4461
4462 static bool unix_ex_wire_to_permset(connection_struct *conn, unsigned char wire_perm, SMB_ACL_PERMSET_T *p_permset)
4463 {
4464 if (wire_perm & ~(SMB_POSIX_ACL_READ|SMB_POSIX_ACL_WRITE|SMB_POSIX_ACL_EXECUTE)) {
4465 return False;
4466 }
4467
4468 if (sys_acl_clear_perms(*p_permset) == -1) {
4469 return False;
4470 }
4471
4472 if (wire_perm & SMB_POSIX_ACL_READ) {
4473 if (sys_acl_add_perm(*p_permset, SMB_ACL_READ) == -1) {
4474 return False;
4475 }
4476 }
4477 if (wire_perm & SMB_POSIX_ACL_WRITE) {
4478 if (sys_acl_add_perm(*p_permset, SMB_ACL_WRITE) == -1) {
4479 return False;
4480 }
4481 }
4482 if (wire_perm & SMB_POSIX_ACL_EXECUTE) {
4483 if (sys_acl_add_perm(*p_permset, SMB_ACL_EXECUTE) == -1) {
4484 return False;
4485 }
4486 }
4487 return True;
4488 }
4489
4490 /****************************************************************************
4491 Map from wire type to tagtype.
4492 ****************************************************************************/
4493
4494 static bool unix_ex_wire_to_tagtype(unsigned char wire_tt, SMB_ACL_TAG_T *p_tt)
4495 {
4496 switch (wire_tt) {
4497 case SMB_POSIX_ACL_USER_OBJ:
4498 *p_tt = SMB_ACL_USER_OBJ;
4499 break;
4500 case SMB_POSIX_ACL_USER:
4501 *p_tt = SMB_ACL_USER;
4502 break;
4503 case SMB_POSIX_ACL_GROUP_OBJ:
4504 *p_tt = SMB_ACL_GROUP_OBJ;
4505 break;
4506 case SMB_POSIX_ACL_GROUP:
4507 *p_tt = SMB_ACL_GROUP;
4508 break;
4509 case SMB_POSIX_ACL_MASK:
4510 *p_tt = SMB_ACL_MASK;
4511 break;
4512 case SMB_POSIX_ACL_OTHER:
4513 *p_tt = SMB_ACL_OTHER;
4514 break;
4515 default:
4516 return False;
4517 }
4518 return True;
4519 }
4520
4521 /****************************************************************************
4522 Create a new POSIX acl from wire permissions.
4523 FIXME ! How does the share mask/mode fit into this.... ?
4524 ****************************************************************************/
4525
4526 static SMB_ACL_T create_posix_acl_from_wire(connection_struct *conn, uint16 num_acls, const char *pdata)
4527 {
4528 unsigned int i;
4529 SMB_ACL_T the_acl = sys_acl_init();
4530
4531 if (the_acl == NULL) {
4532 return NULL;
4533 }
4534
4535 for (i = 0; i < num_acls; i++) {
4536 SMB_ACL_ENTRY_T the_entry;
4537 SMB_ACL_PERMSET_T the_permset;
4538 SMB_ACL_TAG_T tag_type;
4539
4540 if (sys_acl_create_entry(&the_acl, &the_entry) == -1) {
4541 DEBUG(0,("create_posix_acl_from_wire: Failed to create entry %u. (%s)\n",
4542 i, strerror(errno) ));
4543 goto fail;
4544 }
4545
4546 if (!unix_ex_wire_to_tagtype(CVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)), &tag_type)) {
4547 DEBUG(0,("create_posix_acl_from_wire: invalid wire tagtype %u on entry %u.\n",
4548 CVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)), i ));
4549 goto fail;
4550 }
4551
4552 if (sys_acl_set_tag_type(the_entry, tag_type) == -1) {
4553 DEBUG(0,("create_posix_acl_from_wire: Failed to set tagtype on entry %u. (%s)\n",
4554 i, strerror(errno) ));
4555 goto fail;
4556 }
4557
4558 /* Get the permset pointer from the new ACL entry. */
4559 if (sys_acl_get_permset(the_entry, &the_permset) == -1) {
4560 DEBUG(0,("create_posix_acl_from_wire: Failed to get permset on entry %u. (%s)\n",
4561 i, strerror(errno) ));
4562 goto fail;
4563 }
4564
4565 /* Map from wire to permissions. */
4566 if (!unix_ex_wire_to_permset(conn, CVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)+1), &the_permset)) {
4567 DEBUG(0,("create_posix_acl_from_wire: invalid permset %u on entry %u.\n",
4568 CVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE) + 1), i ));
4569 goto fail;
4570 }
4571
4572 /* Now apply to the new ACL entry. */
4573 if (sys_acl_set_permset(the_entry, the_permset) == -1) {
4574 DEBUG(0,("create_posix_acl_from_wire: Failed to add permset on entry %u. (%s)\n",
4575 i, strerror(errno) ));
4576 goto fail;
4577 }
4578
4579 if (tag_type == SMB_ACL_USER) {
4580 uint32 uidval = IVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)+2);
4581 uid_t uid = (uid_t)uidval;
4582 if (sys_acl_set_qualifier(the_entry,(void *)&uid) == -1) {
4583 DEBUG(0,("create_posix_acl_from_wire: Failed to set uid %u on entry %u. (%s)\n",
4584 (unsigned int)uid, i, strerror(errno) ));
4585 goto fail;
4586 }
4587 }
4588
4589 if (tag_type == SMB_ACL_GROUP) {
4590 uint32 gidval = IVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)+2);
4591 gid_t gid = (uid_t)gidval;
4592 if (sys_acl_set_qualifier(the_entry,(void *)&gid) == -1) {
4593 DEBUG(0,("create_posix_acl_from_wire: Failed to set gid %u on entry %u. (%s)\n",
4594 (unsigned int)gid, i, strerror(errno) ));
4595 goto fail;
4596 }
4597 }
4598 }
4599
4600 return the_acl;
4601
4602 fail:
4603
4604 if (the_acl != NULL) {
4605 TALLOC_FREE(the_acl);
4606 }
4607 return NULL;
4608 }
4609
4610 /****************************************************************************
4611 Calls from UNIX extensions - Default POSIX ACL set.
4612 If num_def_acls == 0 and not a directory just return. If it is a directory
4613 and num_def_acls == 0 then remove the default acl. Else set the default acl
4614 on the directory.
4615 ****************************************************************************/
4616
4617 bool set_unix_posix_default_acl(connection_struct *conn, const char *fname, const SMB_STRUCT_STAT *psbuf,
4618 uint16 num_def_acls, const char *pdata)
4619 {
4620 SMB_ACL_T def_acl = NULL;
4621
4622 if (!S_ISDIR(psbuf->st_ex_mode)) {
4623 if (num_def_acls) {
4624 DEBUG(5,("set_unix_posix_default_acl: Can't set default ACL on non-directory file %s\n", fname ));
4625 errno = EISDIR;
4626 return False;
4627 } else {
4628 return True;
4629 }
4630 }
4631
4632 if (!num_def_acls) {
4633 /* Remove the default ACL. */
4634 if (SMB_VFS_SYS_ACL_DELETE_DEF_FILE(conn, fname) == -1) {
4635 DEBUG(5,("set_unix_posix_default_acl: acl_delete_def_file failed on directory %s (%s)\n",
4636 fname, strerror(errno) ));
4637 return False;
4638 }
4639 return True;
4640 }
4641
4642 if ((def_acl = create_posix_acl_from_wire(conn, num_def_acls, pdata)) == NULL) {
4643 return False;
4644 }
4645
4646 if (SMB_VFS_SYS_ACL_SET_FILE(conn, fname, SMB_ACL_TYPE_DEFAULT, def_acl) == -1) {
4647 DEBUG(5,("set_unix_posix_default_acl: acl_set_file failed on directory %s (%s)\n",
4648 fname, strerror(errno) ));
4649 TALLOC_FREE(def_acl);
4650 return False;
4651 }
4652
4653 DEBUG(10,("set_unix_posix_default_acl: set default acl for file %s\n", fname ));
4654 TALLOC_FREE(def_acl);
4655 return True;
4656 }
4657
4658 /****************************************************************************
4659 Remove an ACL from a file. As we don't have acl_delete_entry() available
4660 we must read the current acl and copy all entries except MASK, USER and GROUP
4661 to a new acl, then set that. This (at least on Linux) causes any ACL to be
4662 removed.
4663 FIXME ! How does the share mask/mode fit into this.... ?
4664 ****************************************************************************/
4665
4666 static bool remove_posix_acl(connection_struct *conn, files_struct *fsp, const char *fname)
4667 {
4668 SMB_ACL_T file_acl = NULL;
4669 int entry_id = SMB_ACL_FIRST_ENTRY;
4670 SMB_ACL_ENTRY_T entry;
4671 bool ret = False;
4672 /* Create a new ACL with only 3 entries, u/g/w. */
4673 SMB_ACL_T new_file_acl = sys_acl_init();
4674 SMB_ACL_ENTRY_T user_ent = NULL;
4675 SMB_ACL_ENTRY_T group_ent = NULL;
4676 SMB_ACL_ENTRY_T other_ent = NULL;
4677
4678 if (new_file_acl == NULL) {
4679 DEBUG(5,("remove_posix_acl: failed to init new ACL with 3 entries for file %s.\n", fname));
4680 return False;
4681 }
4682
4683 /* Now create the u/g/w entries. */
4684 if (sys_acl_create_entry(&new_file_acl, &user_ent) == -1) {
4685 DEBUG(5,("remove_posix_acl: Failed to create user entry for file %s. (%s)\n",
4686 fname, strerror(errno) ));
4687 goto done;
4688 }
4689 if (sys_acl_set_tag_type(user_ent, SMB_ACL_USER_OBJ) == -1) {
4690 DEBUG(5,("remove_posix_acl: Failed to set user entry for file %s. (%s)\n",
4691 fname, strerror(errno) ));
4692 goto done;
4693 }
4694
4695 if (sys_acl_create_entry(&new_file_acl, &group_ent) == -1) {
4696 DEBUG(5,("remove_posix_acl: Failed to create group entry for file %s. (%s)\n",
4697 fname, strerror(errno) ));
4698 goto done;
4699 }
4700 if (sys_acl_set_tag_type(group_ent, SMB_ACL_GROUP_OBJ) == -1) {
4701 DEBUG(5,("remove_posix_acl: Failed to set group entry for file %s. (%s)\n",
4702 fname, strerror(errno) ));
4703 goto done;
4704 }
4705
4706 if (sys_acl_create_entry(&new_file_acl, &other_ent) == -1) {
4707 DEBUG(5,("remove_posix_acl: Failed to create other entry for file %s. (%s)\n",
4708 fname, strerror(errno) ));
4709 goto done;
4710 }
4711 if (sys_acl_set_tag_type(other_ent, SMB_ACL_OTHER) == -1) {
4712 DEBUG(5,("remove_posix_acl: Failed to set other entry for file %s. (%s)\n",
4713 fname, strerror(errno) ));
4714 goto done;
4715 }
4716
4717 /* Get the current file ACL. */
4718 if (fsp && fsp->fh->fd != -1) {
4719 file_acl = SMB_VFS_SYS_ACL_GET_FD(fsp);
4720 } else {
4721 file_acl = SMB_VFS_SYS_ACL_GET_FILE( conn, fname, SMB_ACL_TYPE_ACCESS);
4722 }
4723
4724 if (file_acl == NULL) {
4725 /* This is only returned if an error occurred. Even for a file with
4726 no acl a u/g/w acl should be returned. */
4727 DEBUG(5,("remove_posix_acl: failed to get ACL from file %s (%s).\n",
4728 fname, strerror(errno) ));
4729 goto done;
4730 }
4731
4732 while ( sys_acl_get_entry(file_acl, entry_id, &entry) == 1) {
4733 SMB_ACL_TAG_T tagtype;
4734 SMB_ACL_PERMSET_T permset;
4735
4736 entry_id = SMB_ACL_NEXT_ENTRY;
4737
4738 if (sys_acl_get_tag_type(entry, &tagtype) == -1) {
4739 DEBUG(5,("remove_posix_acl: failed to get tagtype from ACL on file %s (%s).\n",
4740 fname, strerror(errno) ));
4741 goto done;
4742 }
4743
4744 if (sys_acl_get_permset(entry, &permset) == -1) {
4745 DEBUG(5,("remove_posix_acl: failed to get permset from ACL on file %s (%s).\n",
4746 fname, strerror(errno) ));
4747 goto done;
4748 }
4749
4750 if (tagtype == SMB_ACL_USER_OBJ) {
4751 if (sys_acl_set_permset(user_ent, permset) == -1) {
4752 DEBUG(5,("remove_posix_acl: failed to set permset from ACL on file %s (%s).\n",
4753 fname, strerror(errno) ));
4754 }
4755 } else if (tagtype == SMB_ACL_GROUP_OBJ) {
4756 if (sys_acl_set_permset(group_ent, permset) == -1) {
4757 DEBUG(5,("remove_posix_acl: failed to set permset from ACL on file %s (%s).\n",
4758 fname, strerror(errno) ));
4759 }
4760 } else if (tagtype == SMB_ACL_OTHER) {
4761 if (sys_acl_set_permset(other_ent, permset) == -1) {
4762 DEBUG(5,("remove_posix_acl: failed to set permset from ACL on file %s (%s).\n",
4763 fname, strerror(errno) ));
4764 }
4765 }
4766 }
4767
4768 /* Set the new empty file ACL. */
4769 if (fsp && fsp->fh->fd != -1) {
4770 if (SMB_VFS_SYS_ACL_SET_FD(fsp, new_file_acl) == -1) {
4771 DEBUG(5,("remove_posix_acl: acl_set_file failed on %s (%s)\n",
4772 fname, strerror(errno) ));
4773 goto done;
4774 }
4775 } else {
4776 if (SMB_VFS_SYS_ACL_SET_FILE(conn, fname, SMB_ACL_TYPE_ACCESS, new_file_acl) == -1) {
4777 DEBUG(5,("remove_posix_acl: acl_set_file failed on %s (%s)\n",
4778 fname, strerror(errno) ));
4779 goto done;
4780 }
4781 }
4782
4783 ret = True;
4784
4785 done:
4786
4787 if (file_acl) {
4788 TALLOC_FREE(file_acl);
4789 }
4790 if (new_file_acl) {
4791 TALLOC_FREE(new_file_acl);
4792 }
4793 return ret;
4794 }
4795
4796 /****************************************************************************
4797 Calls from UNIX extensions - POSIX ACL set.
4798 If num_def_acls == 0 then read/modify/write acl after removing all entries
4799 except SMB_ACL_USER_OBJ, SMB_ACL_GROUP_OBJ, SMB_ACL_OTHER.
4800 ****************************************************************************/
4801
4802 bool set_unix_posix_acl(connection_struct *conn, files_struct *fsp, const char *fname, uint16 num_acls, const char *pdata)
4803 {
4804 SMB_ACL_T file_acl = NULL;
4805
4806 if (!num_acls) {
4807 /* Remove the ACL from the file. */
4808 return remove_posix_acl(conn, fsp, fname);
4809 }
4810
4811 if ((file_acl = create_posix_acl_from_wire(conn, num_acls, pdata)) == NULL) {
4812 return False;
4813 }
4814
4815 if (fsp && fsp->fh->fd != -1) {
4816 /* The preferred way - use an open fd. */
4817 if (SMB_VFS_SYS_ACL_SET_FD(fsp, file_acl) == -1) {
4818 DEBUG(5,("set_unix_posix_acl: acl_set_file failed on %s (%s)\n",
4819 fname, strerror(errno) ));
4820 TALLOC_FREE(file_acl);
4821 return False;
4822 }
4823 } else {
4824 if (SMB_VFS_SYS_ACL_SET_FILE(conn, fname, SMB_ACL_TYPE_ACCESS, file_acl) == -1) {
4825 DEBUG(5,("set_unix_posix_acl: acl_set_file failed on %s (%s)\n",
4826 fname, strerror(errno) ));
4827 TALLOC_FREE(file_acl);
4828 return False;
4829 }
4830 }
4831
4832 DEBUG(10,("set_unix_posix_acl: set acl for file %s\n", fname ));
4833 TALLOC_FREE(file_acl);
4834 return True;
4835 }
4836
4837 /********************************************************************
4838 Pull the NT ACL from a file on disk or the OpenEventlog() access
4839 check. Caller is responsible for freeing the returned security
4840 descriptor via TALLOC_FREE(). This is designed for dealing with
4841 user space access checks in smbd outside of the VFS. For example,
4842 checking access rights in OpenEventlog().
4843
4844 Assume we are dealing with files (for now)
4845 ********************************************************************/
4846
4847 struct security_descriptor *get_nt_acl_no_snum( TALLOC_CTX *ctx, const char *fname, uint32 security_info_wanted)
4848 {
4849 struct security_descriptor *psd, *ret_sd;
4850 connection_struct *conn;
4851 files_struct finfo;
4852 struct fd_handle fh;
4853 NTSTATUS status;
4854 TALLOC_CTX *frame = talloc_stackframe();
4855
4856 conn = talloc_zero(frame, connection_struct);
4857 if (conn == NULL) {
4858 DEBUG(0, ("talloc failed\n"));
4859 return NULL;
4860 }
4861
4862 if (!(conn->params = talloc(conn, struct share_params))) {
4863 DEBUG(0,("get_nt_acl_no_snum: talloc() failed!\n"));
4864 TALLOC_FREE(frame);
4865 return NULL;
4866 }
4867
4868 conn->params->service = -1;
4869
4870 set_conn_connectpath(conn, "/");
4871
4872 if (!smbd_vfs_init(conn)) {
4873 DEBUG(0,("get_nt_acl_no_snum: Unable to create a fake connection struct!\n"));
4874 conn_free(conn);
4875 TALLOC_FREE(frame);
4876 return NULL;
4877 }
4878
4879 ZERO_STRUCT( finfo );
4880 ZERO_STRUCT( fh );
4881
4882 finfo.fnum = FNUM_FIELD_INVALID;
4883 finfo.conn = conn;
4884 finfo.fh = &fh;
4885 finfo.fh->fd = -1;
4886
4887 status = create_synthetic_smb_fname(frame, fname, NULL, NULL,
4888 &finfo.fsp_name);
4889 if (!NT_STATUS_IS_OK(status)) {
4890 conn_free(conn);
4891 TALLOC_FREE(frame);
4892 return NULL;
4893 }
4894
4895 if (!NT_STATUS_IS_OK(SMB_VFS_FGET_NT_ACL( &finfo, security_info_wanted, &psd))) {
4896 DEBUG(0,("get_nt_acl_no_snum: get_nt_acl returned zero.\n"));
4897 TALLOC_FREE(finfo.fsp_name);
4898 conn_free(conn);
4899 TALLOC_FREE(frame);
4900 return NULL;
4901 }
4902
4903 ret_sd = dup_sec_desc( ctx, psd );
4904
4905 TALLOC_FREE(finfo.fsp_name);
4906 conn_free(conn);
4907 TALLOC_FREE(frame);
4908
4909 return ret_sd;
4910 }
4911
4912 /* Stolen shamelessly from pvfs_default_acl() in source4 :-). */
4913
4914 NTSTATUS make_default_filesystem_acl(TALLOC_CTX *ctx,
4915 const char *name,
4916 SMB_STRUCT_STAT *psbuf,
4917 struct security_descriptor **ppdesc)
4918 {
4919 struct dom_sid owner_sid, group_sid;
4920 size_t size = 0;
4921 struct security_ace aces[4];
4922 uint32_t access_mask = 0;
4923 mode_t mode = psbuf->st_ex_mode;
4924 struct security_acl *new_dacl = NULL;
4925 int idx = 0;
4926
4927 DEBUG(10,("make_default_filesystem_acl: file %s mode = 0%o\n",
4928 name, (int)mode ));
4929
4930 uid_to_sid(&owner_sid, psbuf->st_ex_uid);
4931 gid_to_sid(&group_sid, psbuf->st_ex_gid);
4932
4933 /*
4934 We provide up to 4 ACEs
4935 - Owner
4936 - Group
4937 - Everyone
4938 - NT System
4939 */
4940
4941 if (mode & S_IRUSR) {
4942 if (mode & S_IWUSR) {
4943 access_mask |= SEC_RIGHTS_FILE_ALL;
4944 } else {
4945 access_mask |= SEC_RIGHTS_FILE_READ | SEC_FILE_EXECUTE;
4946 }
4947 }
4948 if (mode & S_IWUSR) {
4949 access_mask |= SEC_RIGHTS_FILE_WRITE | SEC_STD_DELETE;
4950 }
4951
4952 init_sec_ace(&aces[idx],
4953 &owner_sid,
4954 SEC_ACE_TYPE_ACCESS_ALLOWED,
4955 access_mask,
4956 0);
4957 idx++;
4958
4959 access_mask = 0;
4960 if (mode & S_IRGRP) {
4961 access_mask |= SEC_RIGHTS_FILE_READ | SEC_FILE_EXECUTE;
4962 }
4963 if (mode & S_IWGRP) {
4964 /* note that delete is not granted - this matches posix behaviour */
4965 access_mask |= SEC_RIGHTS_FILE_WRITE;
4966 }
4967 if (access_mask) {
4968 init_sec_ace(&aces[idx],
4969 &group_sid,
4970 SEC_ACE_TYPE_ACCESS_ALLOWED,
4971 access_mask,
4972 0);
4973 idx++;
4974 }
4975
4976 access_mask = 0;
4977 if (mode & S_IROTH) {
4978 access_mask |= SEC_RIGHTS_FILE_READ | SEC_FILE_EXECUTE;
4979 }
4980 if (mode & S_IWOTH) {
4981 access_mask |= SEC_RIGHTS_FILE_WRITE;
4982 }
4983 if (access_mask) {
4984 init_sec_ace(&aces[idx],
4985 &global_sid_World,
4986 SEC_ACE_TYPE_ACCESS_ALLOWED,
4987 access_mask,
4988 0);
4989 idx++;
4990 }
4991
4992 init_sec_ace(&aces[idx],
4993 &global_sid_System,
4994 SEC_ACE_TYPE_ACCESS_ALLOWED,
4995 SEC_RIGHTS_FILE_ALL,
4996 0);
4997 idx++;
4998
4999 new_dacl = make_sec_acl(ctx,
5000 NT4_ACL_REVISION,
5001 idx,
5002 aces);
5003
5004 if (!new_dacl) {
5005 return NT_STATUS_NO_MEMORY;
5006 }
5007
5008 *ppdesc = make_sec_desc(ctx,
5009 SECURITY_DESCRIPTOR_REVISION_1,
5010 SEC_DESC_SELF_RELATIVE|SEC_DESC_DACL_PRESENT,
5011 &owner_sid,
5012 &group_sid,
5013 NULL,
5014 new_dacl,
5015 &size);
5016 if (!*ppdesc) {
5017 return NT_STATUS_NO_MEMORY;
5018 }
5019 return NT_STATUS_OK;
5020 }
reg import