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wbinfo: Fix Coverity ID 242685 Resource leak
[Samba/gebeck_regimport.git] / source3 / smbd / posix_acls.c
blobbbf0eae0f19d0bd635296d2c9f610c39401410b1
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
30 extern const struct generic_mapping file_generic_mapping;
31
32 #undef DBGC_CLASS
33 #define DBGC_CLASS DBGC_ACLS
34
35 /****************************************************************************
36 Data structures representing the internal ACE format.
37 ****************************************************************************/
38
39 enum ace_owner {UID_ACE, GID_ACE, WORLD_ACE};
40 enum ace_attribute {ALLOW_ACE, DENY_ACE}; /* Used for incoming NT ACLS. */
41
42 typedef union posix_id {
43 uid_t uid;
44 gid_t gid;
45 int world;
46 } posix_id;
47
48 typedef struct canon_ace {
49 struct canon_ace *next, *prev;
50 SMB_ACL_TAG_T type;
51 mode_t perms; /* Only use S_I(R|W|X)USR mode bits here. */
52 struct dom_sid trustee;
53 enum ace_owner owner_type;
54 enum ace_attribute attr;
55 posix_id unix_ug;
56 uint8_t ace_flags; /* From windows ACE entry. */
57 } canon_ace;
58
59 #define ALL_ACE_PERMS (S_IRUSR|S_IWUSR|S_IXUSR)
60
61 /*
62 * EA format of user.SAMBA_PAI (Samba_Posix_Acl_Interitance)
63 * attribute on disk - version 1.
64 * All values are little endian.
65 *
66 * | 1 | 1 | 2 | 2 | ....
67 * +------+------+-------------+---------------------+-------------+--------------------+
68 * | vers | flag | num_entries | num_default_entries | ..entries.. | default_entries... |
69 * +------+------+-------------+---------------------+-------------+--------------------+
70 *
71 * Entry format is :
72 *
73 * | 1 | 4 |
74 * +------+-------------------+
75 * | value| uid/gid or world |
76 * | type | value |
77 * +------+-------------------+
78 *
79 * Version 2 format. Stores extra Windows metadata about an ACL.
80 *
81 * | 1 | 2 | 2 | 2 | ....
82 * +------+----------+-------------+---------------------+-------------+--------------------+
83 * | vers | ace | num_entries | num_default_entries | ..entries.. | default_entries... |
84 * | 2 | type | | | | |
85 * +------+----------+-------------+---------------------+-------------+--------------------+
86 *
87 * Entry format is :
88 *
89 * | 1 | 1 | 4 |
90 * +------+------+-------------------+
91 * | ace | value| uid/gid or world |
92 * | flag | type | value |
93 * +------+-------------------+------+
94 *
95 */
96
97 #define PAI_VERSION_OFFSET 0
98
99 #define PAI_V1_FLAG_OFFSET 1
100 #define PAI_V1_NUM_ENTRIES_OFFSET 2
101 #define PAI_V1_NUM_DEFAULT_ENTRIES_OFFSET 4
102 #define PAI_V1_ENTRIES_BASE 6
103 #define PAI_V1_ACL_FLAG_PROTECTED 0x1
104 #define PAI_V1_ENTRY_LENGTH 5
105
106 #define PAI_V1_VERSION 1
107
108 #define PAI_V2_TYPE_OFFSET 1
109 #define PAI_V2_NUM_ENTRIES_OFFSET 3
110 #define PAI_V2_NUM_DEFAULT_ENTRIES_OFFSET 5
111 #define PAI_V2_ENTRIES_BASE 7
112 #define PAI_V2_ENTRY_LENGTH 6
113
114 #define PAI_V2_VERSION 2
115
116 /*
117 * In memory format of user.SAMBA_PAI attribute.
118 */
119
120 struct pai_entry {
121 struct pai_entry *next, *prev;
122 uint8_t ace_flags;
123 enum ace_owner owner_type;
124 posix_id unix_ug;
125 };
126
127 struct pai_val {
128 uint16_t sd_type;
129 unsigned int num_entries;
130 struct pai_entry *entry_list;
131 unsigned int num_def_entries;
132 struct pai_entry *def_entry_list;
133 };
134
135 /************************************************************************
136 Return a uint32 of the pai_entry principal.
137 ************************************************************************/
138
139 static uint32_t get_pai_entry_val(struct pai_entry *paie)
140 {
141 switch (paie->owner_type) {
142 case UID_ACE:
143 DEBUG(10,("get_pai_entry_val: uid = %u\n", (unsigned int)paie->unix_ug.uid ));
144 return (uint32_t)paie->unix_ug.uid;
145 case GID_ACE:
146 DEBUG(10,("get_pai_entry_val: gid = %u\n", (unsigned int)paie->unix_ug.gid ));
147 return (uint32_t)paie->unix_ug.gid;
148 case WORLD_ACE:
149 default:
150 DEBUG(10,("get_pai_entry_val: world ace\n"));
151 return (uint32_t)-1;
152 }
153 }
154
155 /************************************************************************
156 Return a uint32 of the entry principal.
157 ************************************************************************/
158
159 static uint32_t get_entry_val(canon_ace *ace_entry)
160 {
161 switch (ace_entry->owner_type) {
162 case UID_ACE:
163 DEBUG(10,("get_entry_val: uid = %u\n", (unsigned int)ace_entry->unix_ug.uid ));
164 return (uint32_t)ace_entry->unix_ug.uid;
165 case GID_ACE:
166 DEBUG(10,("get_entry_val: gid = %u\n", (unsigned int)ace_entry->unix_ug.gid ));
167 return (uint32_t)ace_entry->unix_ug.gid;
168 case WORLD_ACE:
169 default:
170 DEBUG(10,("get_entry_val: world ace\n"));
171 return (uint32_t)-1;
172 }
173 }
174
175 /************************************************************************
176 Create the on-disk format (always v2 now). Caller must free.
177 ************************************************************************/
178
179 static char *create_pai_buf_v2(canon_ace *file_ace_list,
180 canon_ace *dir_ace_list,
181 uint16_t sd_type,
182 size_t *store_size)
183 {
184 char *pai_buf = NULL;
185 canon_ace *ace_list = NULL;
186 char *entry_offset = NULL;
187 unsigned int num_entries = 0;
188 unsigned int num_def_entries = 0;
189 unsigned int i;
190
191 for (ace_list = file_ace_list; ace_list; ace_list = ace_list->next) {
192 num_entries++;
193 }
194
195 for (ace_list = dir_ace_list; ace_list; ace_list = ace_list->next) {
196 num_def_entries++;
197 }
198
199 DEBUG(10,("create_pai_buf_v2: num_entries = %u, num_def_entries = %u\n", num_entries, num_def_entries ));
200
201 *store_size = PAI_V2_ENTRIES_BASE +
202 ((num_entries + num_def_entries)*PAI_V2_ENTRY_LENGTH);
203
204 pai_buf = talloc_array(talloc_tos(), char, *store_size);
205 if (!pai_buf) {
206 return NULL;
207 }
208
209 /* Set up the header. */
210 memset(pai_buf, '\0', PAI_V2_ENTRIES_BASE);
211 SCVAL(pai_buf,PAI_VERSION_OFFSET,PAI_V2_VERSION);
212 SSVAL(pai_buf,PAI_V2_TYPE_OFFSET, sd_type);
213 SSVAL(pai_buf,PAI_V2_NUM_ENTRIES_OFFSET,num_entries);
214 SSVAL(pai_buf,PAI_V2_NUM_DEFAULT_ENTRIES_OFFSET,num_def_entries);
215
216 DEBUG(10,("create_pai_buf_v2: sd_type = 0x%x\n",
217 (unsigned int)sd_type ));
218
219 entry_offset = pai_buf + PAI_V2_ENTRIES_BASE;
220
221 i = 0;
222 for (ace_list = file_ace_list; ace_list; ace_list = ace_list->next) {
223 uint8_t type_val = (uint8_t)ace_list->owner_type;
224 uint32_t entry_val = get_entry_val(ace_list);
225
226 SCVAL(entry_offset,0,ace_list->ace_flags);
227 SCVAL(entry_offset,1,type_val);
228 SIVAL(entry_offset,2,entry_val);
229 DEBUG(10,("create_pai_buf_v2: entry %u [0x%x] [0x%x] [0x%x]\n",
230 i,
231 (unsigned int)ace_list->ace_flags,
232 (unsigned int)type_val,
233 (unsigned int)entry_val ));
234 i++;
235 entry_offset += PAI_V2_ENTRY_LENGTH;
236 }
237
238 for (ace_list = dir_ace_list; ace_list; ace_list = ace_list->next) {
239 uint8_t type_val = (uint8_t)ace_list->owner_type;
240 uint32_t entry_val = get_entry_val(ace_list);
241
242 SCVAL(entry_offset,0,ace_list->ace_flags);
243 SCVAL(entry_offset,1,type_val);
244 SIVAL(entry_offset,2,entry_val);
245 DEBUG(10,("create_pai_buf_v2: entry %u [0x%x] [0x%x] [0x%x]\n",
246 i,
247 (unsigned int)ace_list->ace_flags,
248 (unsigned int)type_val,
249 (unsigned int)entry_val ));
250 i++;
251 entry_offset += PAI_V2_ENTRY_LENGTH;
252 }
253
254 return pai_buf;
255 }
256
257 /************************************************************************
258 Store the user.SAMBA_PAI attribute on disk.
259 ************************************************************************/
260
261 static void store_inheritance_attributes(files_struct *fsp,
262 canon_ace *file_ace_list,
263 canon_ace *dir_ace_list,
264 uint16_t sd_type)
265 {
266 int ret;
267 size_t store_size;
268 char *pai_buf;
269
270 if (!lp_map_acl_inherit(SNUM(fsp->conn))) {
271 return;
272 }
273
274 pai_buf = create_pai_buf_v2(file_ace_list, dir_ace_list,
275 sd_type, &store_size);
276
277 if (fsp->fh->fd != -1) {
278 ret = SMB_VFS_FSETXATTR(fsp, SAMBA_POSIX_INHERITANCE_EA_NAME,
279 pai_buf, store_size, 0);
280 } else {
281 ret = SMB_VFS_SETXATTR(fsp->conn, fsp->fsp_name->base_name,
282 SAMBA_POSIX_INHERITANCE_EA_NAME,
283 pai_buf, store_size, 0);
284 }
285
286 TALLOC_FREE(pai_buf);
287
288 DEBUG(10,("store_inheritance_attribute: type 0x%x for file %s\n",
289 (unsigned int)sd_type,
290 fsp_str_dbg(fsp)));
291
292 if (ret == -1 && !no_acl_syscall_error(errno)) {
293 DEBUG(1,("store_inheritance_attribute: Error %s\n", strerror(errno) ));
294 }
295 }
296
297 /************************************************************************
298 Delete the in memory inheritance info.
299 ************************************************************************/
300
301 static void free_inherited_info(struct pai_val *pal)
302 {
303 if (pal) {
304 struct pai_entry *paie, *paie_next;
305 for (paie = pal->entry_list; paie; paie = paie_next) {
306 paie_next = paie->next;
307 TALLOC_FREE(paie);
308 }
309 for (paie = pal->def_entry_list; paie; paie = paie_next) {
310 paie_next = paie->next;
311 TALLOC_FREE(paie);
312 }
313 TALLOC_FREE(pal);
314 }
315 }
316
317 /************************************************************************
318 Get any stored ACE flags.
319 ************************************************************************/
320
321 static uint16_t get_pai_flags(struct pai_val *pal, canon_ace *ace_entry, bool default_ace)
322 {
323 struct pai_entry *paie;
324
325 if (!pal) {
326 return 0;
327 }
328
329 /* If the entry exists it is inherited. */
330 for (paie = (default_ace ? pal->def_entry_list : pal->entry_list); paie; paie = paie->next) {
331 if (ace_entry->owner_type == paie->owner_type &&
332 get_entry_val(ace_entry) == get_pai_entry_val(paie))
333 return paie->ace_flags;
334 }
335 return 0;
336 }
337
338 /************************************************************************
339 Ensure an attribute just read is valid - v1.
340 ************************************************************************/
341
342 static bool check_pai_ok_v1(const char *pai_buf, size_t pai_buf_data_size)
343 {
344 uint16 num_entries;
345 uint16 num_def_entries;
346
347 if (pai_buf_data_size < PAI_V1_ENTRIES_BASE) {
348 /* Corrupted - too small. */
349 return false;
350 }
351
352 if (CVAL(pai_buf,PAI_VERSION_OFFSET) != PAI_V1_VERSION) {
353 return false;
354 }
355
356 num_entries = SVAL(pai_buf,PAI_V1_NUM_ENTRIES_OFFSET);
357 num_def_entries = SVAL(pai_buf,PAI_V1_NUM_DEFAULT_ENTRIES_OFFSET);
358
359 /* Check the entry lists match. */
360 /* Each entry is 5 bytes (type plus 4 bytes of uid or gid). */
361
362 if (((num_entries + num_def_entries)*PAI_V1_ENTRY_LENGTH) +
363 PAI_V1_ENTRIES_BASE != pai_buf_data_size) {
364 return false;
365 }
366
367 return true;
368 }
369
370 /************************************************************************
371 Ensure an attribute just read is valid - v2.
372 ************************************************************************/
373
374 static bool check_pai_ok_v2(const char *pai_buf, size_t pai_buf_data_size)
375 {
376 uint16 num_entries;
377 uint16 num_def_entries;
378
379 if (pai_buf_data_size < PAI_V2_ENTRIES_BASE) {
380 /* Corrupted - too small. */
381 return false;
382 }
383
384 if (CVAL(pai_buf,PAI_VERSION_OFFSET) != PAI_V2_VERSION) {
385 return false;
386 }
387
388 num_entries = SVAL(pai_buf,PAI_V2_NUM_ENTRIES_OFFSET);
389 num_def_entries = SVAL(pai_buf,PAI_V2_NUM_DEFAULT_ENTRIES_OFFSET);
390
391 /* Check the entry lists match. */
392 /* Each entry is 6 bytes (flags + type + 4 bytes of uid or gid). */
393
394 if (((num_entries + num_def_entries)*PAI_V2_ENTRY_LENGTH) +
395 PAI_V2_ENTRIES_BASE != pai_buf_data_size) {
396 return false;
397 }
398
399 return true;
400 }
401
402 /************************************************************************
403 Decode the owner.
404 ************************************************************************/
405
406 static bool get_pai_owner_type(struct pai_entry *paie, const char *entry_offset)
407 {
408 paie->owner_type = (enum ace_owner)CVAL(entry_offset,0);
409 switch( paie->owner_type) {
410 case UID_ACE:
411 paie->unix_ug.uid = (uid_t)IVAL(entry_offset,1);
412 DEBUG(10,("get_pai_owner_type: uid = %u\n",
413 (unsigned int)paie->unix_ug.uid ));
414 break;
415 case GID_ACE:
416 paie->unix_ug.gid = (gid_t)IVAL(entry_offset,1);
417 DEBUG(10,("get_pai_owner_type: gid = %u\n",
418 (unsigned int)paie->unix_ug.gid ));
419 break;
420 case WORLD_ACE:
421 paie->unix_ug.world = -1;
422 DEBUG(10,("get_pai_owner_type: world ace\n"));
423 break;
424 default:
425 DEBUG(10,("get_pai_owner_type: unknown type %u\n",
426 (unsigned int)paie->owner_type ));
427 return false;
428 }
429 return true;
430 }
431
432 /************************************************************************
433 Process v2 entries.
434 ************************************************************************/
435
436 static const char *create_pai_v1_entries(struct pai_val *paiv,
437 const char *entry_offset,
438 bool def_entry)
439 {
440 int i;
441
442 for (i = 0; i < paiv->num_entries; i++) {
443 struct pai_entry *paie = talloc(talloc_tos(), struct pai_entry);
444 if (!paie) {
445 return NULL;
446 }
447
448 paie->ace_flags = SEC_ACE_FLAG_INHERITED_ACE;
449 if (!get_pai_owner_type(paie, entry_offset)) {
450 TALLOC_FREE(paie);
451 return NULL;
452 }
453
454 if (!def_entry) {
455 DLIST_ADD(paiv->entry_list, paie);
456 } else {
457 DLIST_ADD(paiv->def_entry_list, paie);
458 }
459 entry_offset += PAI_V1_ENTRY_LENGTH;
460 }
461 return entry_offset;
462 }
463
464 /************************************************************************
465 Convert to in-memory format from version 1.
466 ************************************************************************/
467
468 static struct pai_val *create_pai_val_v1(const char *buf, size_t size)
469 {
470 const char *entry_offset;
471 struct pai_val *paiv = NULL;
472
473 if (!check_pai_ok_v1(buf, size)) {
474 return NULL;
475 }
476
477 paiv = talloc(talloc_tos(), struct pai_val);
478 if (!paiv) {
479 return NULL;
480 }
481
482 memset(paiv, '\0', sizeof(struct pai_val));
483
484 paiv->sd_type = (CVAL(buf,PAI_V1_FLAG_OFFSET) == PAI_V1_ACL_FLAG_PROTECTED) ?
485 SEC_DESC_DACL_PROTECTED : 0;
486
487 paiv->num_entries = SVAL(buf,PAI_V1_NUM_ENTRIES_OFFSET);
488 paiv->num_def_entries = SVAL(buf,PAI_V1_NUM_DEFAULT_ENTRIES_OFFSET);
489
490 entry_offset = buf + PAI_V1_ENTRIES_BASE;
491
492 DEBUG(10,("create_pai_val: num_entries = %u, num_def_entries = %u\n",
493 paiv->num_entries, paiv->num_def_entries ));
494
495 entry_offset = create_pai_v1_entries(paiv, entry_offset, false);
496 if (entry_offset == NULL) {
497 free_inherited_info(paiv);
498 return NULL;
499 }
500 entry_offset = create_pai_v1_entries(paiv, entry_offset, true);
501 if (entry_offset == NULL) {
502 free_inherited_info(paiv);
503 return NULL;
504 }
505
506 return paiv;
507 }
508
509 /************************************************************************
510 Process v2 entries.
511 ************************************************************************/
512
513 static const char *create_pai_v2_entries(struct pai_val *paiv,
514 unsigned int num_entries,
515 const char *entry_offset,
516 bool def_entry)
517 {
518 unsigned int i;
519
520 for (i = 0; i < num_entries; i++) {
521 struct pai_entry *paie = talloc(talloc_tos(), struct pai_entry);
522 if (!paie) {
523 return NULL;
524 }
525
526 paie->ace_flags = CVAL(entry_offset,0);
527
528 if (!get_pai_owner_type(paie, entry_offset+1)) {
529 TALLOC_FREE(paie);
530 return NULL;
531 }
532 if (!def_entry) {
533 DLIST_ADD(paiv->entry_list, paie);
534 } else {
535 DLIST_ADD(paiv->def_entry_list, paie);
536 }
537 entry_offset += PAI_V2_ENTRY_LENGTH;
538 }
539 return entry_offset;
540 }
541
542 /************************************************************************
543 Convert to in-memory format from version 2.
544 ************************************************************************/
545
546 static struct pai_val *create_pai_val_v2(const char *buf, size_t size)
547 {
548 const char *entry_offset;
549 struct pai_val *paiv = NULL;
550
551 if (!check_pai_ok_v2(buf, size)) {
552 return NULL;
553 }
554
555 paiv = talloc(talloc_tos(), struct pai_val);
556 if (!paiv) {
557 return NULL;
558 }
559
560 memset(paiv, '\0', sizeof(struct pai_val));
561
562 paiv->sd_type = SVAL(buf,PAI_V2_TYPE_OFFSET);
563
564 paiv->num_entries = SVAL(buf,PAI_V2_NUM_ENTRIES_OFFSET);
565 paiv->num_def_entries = SVAL(buf,PAI_V2_NUM_DEFAULT_ENTRIES_OFFSET);
566
567 entry_offset = buf + PAI_V2_ENTRIES_BASE;
568
569 DEBUG(10,("create_pai_val_v2: sd_type = 0x%x num_entries = %u, num_def_entries = %u\n",
570 (unsigned int)paiv->sd_type,
571 paiv->num_entries, paiv->num_def_entries ));
572
573 entry_offset = create_pai_v2_entries(paiv, paiv->num_entries,
574 entry_offset, false);
575 if (entry_offset == NULL) {
576 free_inherited_info(paiv);
577 return NULL;
578 }
579 entry_offset = create_pai_v2_entries(paiv, paiv->num_def_entries,
580 entry_offset, true);
581 if (entry_offset == NULL) {
582 free_inherited_info(paiv);
583 return NULL;
584 }
585
586 return paiv;
587 }
588
589 /************************************************************************
590 Convert to in-memory format - from either version 1 or 2.
591 ************************************************************************/
592
593 static struct pai_val *create_pai_val(const char *buf, size_t size)
594 {
595 if (size < 1) {
596 return NULL;
597 }
598 if (CVAL(buf,PAI_VERSION_OFFSET) == PAI_V1_VERSION) {
599 return create_pai_val_v1(buf, size);
600 } else if (CVAL(buf,PAI_VERSION_OFFSET) == PAI_V2_VERSION) {
601 return create_pai_val_v2(buf, size);
602 } else {
603 return NULL;
604 }
605 }
606
607 /************************************************************************
608 Load the user.SAMBA_PAI attribute.
609 ************************************************************************/
610
611 static struct pai_val *fload_inherited_info(files_struct *fsp)
612 {
613 char *pai_buf;
614 size_t pai_buf_size = 1024;
615 struct pai_val *paiv = NULL;
616 ssize_t ret;
617
618 if (!lp_map_acl_inherit(SNUM(fsp->conn))) {
619 return NULL;
620 }
621
622 if ((pai_buf = talloc_array(talloc_tos(), char, pai_buf_size)) == NULL) {
623 return NULL;
624 }
625
626 do {
627 if (fsp->fh->fd != -1) {
628 ret = SMB_VFS_FGETXATTR(fsp, SAMBA_POSIX_INHERITANCE_EA_NAME,
629 pai_buf, pai_buf_size);
630 } else {
631 ret = SMB_VFS_GETXATTR(fsp->conn,
632 fsp->fsp_name->base_name,
633 SAMBA_POSIX_INHERITANCE_EA_NAME,
634 pai_buf, pai_buf_size);
635 }
636
637 if (ret == -1) {
638 if (errno != ERANGE) {
639 break;
640 }
641 /* Buffer too small - enlarge it. */
642 pai_buf_size *= 2;
643 TALLOC_FREE(pai_buf);
644 if (pai_buf_size > 1024*1024) {
645 return NULL; /* Limit malloc to 1mb. */
646 }
647 if ((pai_buf = talloc_array(talloc_tos(), char, pai_buf_size)) == NULL)
648 return NULL;
649 }
650 } while (ret == -1);
651
652 DEBUG(10,("load_inherited_info: ret = %lu for file %s\n",
653 (unsigned long)ret, fsp_str_dbg(fsp)));
654
655 if (ret == -1) {
656 /* No attribute or not supported. */
657 #if defined(ENOATTR)
658 if (errno != ENOATTR)
659 DEBUG(10,("load_inherited_info: Error %s\n", strerror(errno) ));
660 #else
661 if (errno != ENOSYS)
662 DEBUG(10,("load_inherited_info: Error %s\n", strerror(errno) ));
663 #endif
664 TALLOC_FREE(pai_buf);
665 return NULL;
666 }
667
668 paiv = create_pai_val(pai_buf, ret);
669
670 if (paiv) {
671 DEBUG(10,("load_inherited_info: ACL type is 0x%x for file %s\n",
672 (unsigned int)paiv->sd_type, fsp_str_dbg(fsp)));
673 }
674
675 TALLOC_FREE(pai_buf);
676 return paiv;
677 }
678
679 /************************************************************************
680 Load the user.SAMBA_PAI attribute.
681 ************************************************************************/
682
683 static struct pai_val *load_inherited_info(const struct connection_struct *conn,
684 const char *fname)
685 {
686 char *pai_buf;
687 size_t pai_buf_size = 1024;
688 struct pai_val *paiv = NULL;
689 ssize_t ret;
690
691 if (!lp_map_acl_inherit(SNUM(conn))) {
692 return NULL;
693 }
694
695 if ((pai_buf = talloc_array(talloc_tos(), char, pai_buf_size)) == NULL) {
696 return NULL;
697 }
698
699 do {
700 ret = SMB_VFS_GETXATTR(conn, fname,
701 SAMBA_POSIX_INHERITANCE_EA_NAME,
702 pai_buf, pai_buf_size);
703
704 if (ret == -1) {
705 if (errno != ERANGE) {
706 break;
707 }
708 /* Buffer too small - enlarge it. */
709 pai_buf_size *= 2;
710 TALLOC_FREE(pai_buf);
711 if (pai_buf_size > 1024*1024) {
712 return NULL; /* Limit malloc to 1mb. */
713 }
714 if ((pai_buf = talloc_array(talloc_tos(), char, pai_buf_size)) == NULL)
715 return NULL;
716 }
717 } while (ret == -1);
718
719 DEBUG(10,("load_inherited_info: ret = %lu for file %s\n", (unsigned long)ret, fname));
720
721 if (ret == -1) {
722 /* No attribute or not supported. */
723 #if defined(ENOATTR)
724 if (errno != ENOATTR)
725 DEBUG(10,("load_inherited_info: Error %s\n", strerror(errno) ));
726 #else
727 if (errno != ENOSYS)
728 DEBUG(10,("load_inherited_info: Error %s\n", strerror(errno) ));
729 #endif
730 TALLOC_FREE(pai_buf);
731 return NULL;
732 }
733
734 paiv = create_pai_val(pai_buf, ret);
735
736 if (paiv) {
737 DEBUG(10,("load_inherited_info: ACL type 0x%x for file %s\n",
738 (unsigned int)paiv->sd_type,
739 fname));
740 }
741
742 TALLOC_FREE(pai_buf);
743 return paiv;
744 }
745
746 /****************************************************************************
747 Functions to manipulate the internal ACE format.
748 ****************************************************************************/
749
750 /****************************************************************************
751 Count a linked list of canonical ACE entries.
752 ****************************************************************************/
753
754 static size_t count_canon_ace_list( canon_ace *l_head )
755 {
756 size_t count = 0;
757 canon_ace *ace;
758
759 for (ace = l_head; ace; ace = ace->next)
760 count++;
761
762 return count;
763 }
764
765 /****************************************************************************
766 Free a linked list of canonical ACE entries.
767 ****************************************************************************/
768
769 static void free_canon_ace_list( canon_ace *l_head )
770 {
771 canon_ace *list, *next;
772
773 for (list = l_head; list; list = next) {
774 next = list->next;
775 DLIST_REMOVE(l_head, list);
776 TALLOC_FREE(list);
777 }
778 }
779
780 /****************************************************************************
781 Function to duplicate a canon_ace entry.
782 ****************************************************************************/
783
784 static canon_ace *dup_canon_ace( canon_ace *src_ace)
785 {
786 canon_ace *dst_ace = talloc(talloc_tos(), canon_ace);
787
788 if (dst_ace == NULL)
789 return NULL;
790
791 *dst_ace = *src_ace;
792 dst_ace->prev = dst_ace->next = NULL;
793 return dst_ace;
794 }
795
796 /****************************************************************************
797 Print out a canon ace.
798 ****************************************************************************/
799
800 static void print_canon_ace(canon_ace *pace, int num)
801 {
802 dbgtext( "canon_ace index %d. Type = %s ", num, pace->attr == ALLOW_ACE ? "allow" : "deny" );
803 dbgtext( "SID = %s ", sid_string_dbg(&pace->trustee));
804 if (pace->owner_type == UID_ACE) {
805 const char *u_name = uidtoname(pace->unix_ug.uid);
806 dbgtext( "uid %u (%s) ", (unsigned int)pace->unix_ug.uid, u_name );
807 } else if (pace->owner_type == GID_ACE) {
808 char *g_name = gidtoname(pace->unix_ug.gid);
809 dbgtext( "gid %u (%s) ", (unsigned int)pace->unix_ug.gid, g_name );
810 } else
811 dbgtext( "other ");
812 switch (pace->type) {
813 case SMB_ACL_USER:
814 dbgtext( "SMB_ACL_USER ");
815 break;
816 case SMB_ACL_USER_OBJ:
817 dbgtext( "SMB_ACL_USER_OBJ ");
818 break;
819 case SMB_ACL_GROUP:
820 dbgtext( "SMB_ACL_GROUP ");
821 break;
822 case SMB_ACL_GROUP_OBJ:
823 dbgtext( "SMB_ACL_GROUP_OBJ ");
824 break;
825 case SMB_ACL_OTHER:
826 dbgtext( "SMB_ACL_OTHER ");
827 break;
828 default:
829 dbgtext( "MASK " );
830 break;
831 }
832
833 dbgtext( "ace_flags = 0x%x ", (unsigned int)pace->ace_flags);
834 dbgtext( "perms ");
835 dbgtext( "%c", pace->perms & S_IRUSR ? 'r' : '-');
836 dbgtext( "%c", pace->perms & S_IWUSR ? 'w' : '-');
837 dbgtext( "%c\n", pace->perms & S_IXUSR ? 'x' : '-');
838 }
839
840 /****************************************************************************
841 Print out a canon ace list.
842 ****************************************************************************/
843
844 static void print_canon_ace_list(const char *name, canon_ace *ace_list)
845 {
846 int count = 0;
847
848 if( DEBUGLVL( 10 )) {
849 dbgtext( "print_canon_ace_list: %s\n", name );
850 for (;ace_list; ace_list = ace_list->next, count++)
851 print_canon_ace(ace_list, count );
852 }
853 }
854
855 /****************************************************************************
856 Map POSIX ACL perms to canon_ace permissions (a mode_t containing only S_(R|W|X)USR bits).
857 ****************************************************************************/
858
859 static mode_t convert_permset_to_mode_t(connection_struct *conn, SMB_ACL_PERMSET_T permset)
860 {
861 mode_t ret = 0;
862
863 ret |= (SMB_VFS_SYS_ACL_GET_PERM(conn, permset, SMB_ACL_READ) ? S_IRUSR : 0);
864 ret |= (SMB_VFS_SYS_ACL_GET_PERM(conn, permset, SMB_ACL_WRITE) ? S_IWUSR : 0);
865 ret |= (SMB_VFS_SYS_ACL_GET_PERM(conn, permset, SMB_ACL_EXECUTE) ? S_IXUSR : 0);
866
867 return ret;
868 }
869
870 /****************************************************************************
871 Map generic UNIX permissions to canon_ace permissions (a mode_t containing only S_(R|W|X)USR bits).
872 ****************************************************************************/
873
874 static mode_t unix_perms_to_acl_perms(mode_t mode, int r_mask, int w_mask, int x_mask)
875 {
876 mode_t ret = 0;
877
878 if (mode & r_mask)
879 ret |= S_IRUSR;
880 if (mode & w_mask)
881 ret |= S_IWUSR;
882 if (mode & x_mask)
883 ret |= S_IXUSR;
884
885 return ret;
886 }
887
888 /****************************************************************************
889 Map canon_ace permissions (a mode_t containing only S_(R|W|X)USR bits) to
890 an SMB_ACL_PERMSET_T.
891 ****************************************************************************/
892
893 static int map_acl_perms_to_permset(connection_struct *conn, mode_t mode, SMB_ACL_PERMSET_T *p_permset)
894 {
895 if (SMB_VFS_SYS_ACL_CLEAR_PERMS(conn, *p_permset) == -1)
896 return -1;
897 if (mode & S_IRUSR) {
898 if (SMB_VFS_SYS_ACL_ADD_PERM(conn, *p_permset, SMB_ACL_READ) == -1)
899 return -1;
900 }
901 if (mode & S_IWUSR) {
902 if (SMB_VFS_SYS_ACL_ADD_PERM(conn, *p_permset, SMB_ACL_WRITE) == -1)
903 return -1;
904 }
905 if (mode & S_IXUSR) {
906 if (SMB_VFS_SYS_ACL_ADD_PERM(conn, *p_permset, SMB_ACL_EXECUTE) == -1)
907 return -1;
908 }
909 return 0;
910 }
911
912 /****************************************************************************
913 Function to create owner and group SIDs from a SMB_STRUCT_STAT.
914 ****************************************************************************/
915
916 void create_file_sids(const SMB_STRUCT_STAT *psbuf, struct dom_sid *powner_sid, struct dom_sid *pgroup_sid)
917 {
918 uid_to_sid( powner_sid, psbuf->st_ex_uid );
919 gid_to_sid( pgroup_sid, psbuf->st_ex_gid );
920 }
921
922 /****************************************************************************
923 Merge aces with a common sid - if both are allow or deny, OR the permissions together and
924 delete the second one. If the first is deny, mask the permissions off and delete the allow
925 if the permissions become zero, delete the deny if the permissions are non zero.
926 ****************************************************************************/
927
928 static void merge_aces( canon_ace **pp_list_head, bool dir_acl)
929 {
930 canon_ace *l_head = *pp_list_head;
931 canon_ace *curr_ace_outer;
932 canon_ace *curr_ace_outer_next;
933
934 /*
935 * First, merge allow entries with identical SIDs, and deny entries
936 * with identical SIDs.
937 */
938
939 for (curr_ace_outer = l_head; curr_ace_outer; curr_ace_outer = curr_ace_outer_next) {
940 canon_ace *curr_ace;
941 canon_ace *curr_ace_next;
942
943 curr_ace_outer_next = curr_ace_outer->next; /* Save the link in case we delete. */
944
945 for (curr_ace = curr_ace_outer->next; curr_ace; curr_ace = curr_ace_next) {
946 bool can_merge = false;
947
948 curr_ace_next = curr_ace->next; /* Save the link in case of delete. */
949
950 /* For file ACLs we can merge if the SIDs and ALLOW/DENY
951 * types are the same. For directory acls we must also
952 * ensure the POSIX ACL types are the same. */
953
954 if (!dir_acl) {
955 can_merge = (dom_sid_equal(&curr_ace->trustee, &curr_ace_outer->trustee) &&
956 (curr_ace->attr == curr_ace_outer->attr));
957 } else {
958 can_merge = (dom_sid_equal(&curr_ace->trustee, &curr_ace_outer->trustee) &&
959 (curr_ace->type == curr_ace_outer->type) &&
960 (curr_ace->attr == curr_ace_outer->attr));
961 }
962
963 if (can_merge) {
964 if( DEBUGLVL( 10 )) {
965 dbgtext("merge_aces: Merging ACE's\n");
966 print_canon_ace( curr_ace_outer, 0);
967 print_canon_ace( curr_ace, 0);
968 }
969
970 /* Merge two allow or two deny ACE's. */
971
972 /* Theoretically we shouldn't merge a dir ACE if
973 * one ACE has the CI flag set, and the other
974 * ACE has the OI flag set, but this is rare
975 * enough we can ignore it. */
976
977 curr_ace_outer->perms |= curr_ace->perms;
978 curr_ace_outer->ace_flags |= curr_ace->ace_flags;
979 DLIST_REMOVE(l_head, curr_ace);
980 TALLOC_FREE(curr_ace);
981 curr_ace_outer_next = curr_ace_outer->next; /* We may have deleted the link. */
982 }
983 }
984 }
985
986 /*
987 * Now go through and mask off allow permissions with deny permissions.
988 * We can delete either the allow or deny here as we know that each SID
989 * appears only once in the list.
990 */
991
992 for (curr_ace_outer = l_head; curr_ace_outer; curr_ace_outer = curr_ace_outer_next) {
993 canon_ace *curr_ace;
994 canon_ace *curr_ace_next;
995
996 curr_ace_outer_next = curr_ace_outer->next; /* Save the link in case we delete. */
997
998 for (curr_ace = curr_ace_outer->next; curr_ace; curr_ace = curr_ace_next) {
999
1000 curr_ace_next = curr_ace->next; /* Save the link in case of delete. */
1001
1002 /*
1003 * Subtract ACE's with different entries. Due to the ordering constraints
1004 * we've put on the ACL, we know the deny must be the first one.
1005 */
1006
1007 if (dom_sid_equal(&curr_ace->trustee, &curr_ace_outer->trustee) &&
1008 (curr_ace_outer->attr == DENY_ACE) && (curr_ace->attr == ALLOW_ACE)) {
1009
1010 if( DEBUGLVL( 10 )) {
1011 dbgtext("merge_aces: Masking ACE's\n");
1012 print_canon_ace( curr_ace_outer, 0);
1013 print_canon_ace( curr_ace, 0);
1014 }
1015
1016 curr_ace->perms &= ~curr_ace_outer->perms;
1017
1018 if (curr_ace->perms == 0) {
1019
1020 /*
1021 * The deny overrides the allow. Remove the allow.
1022 */
1023
1024 DLIST_REMOVE(l_head, curr_ace);
1025 TALLOC_FREE(curr_ace);
1026 curr_ace_outer_next = curr_ace_outer->next; /* We may have deleted the link. */
1027
1028 } else {
1029
1030 /*
1031 * Even after removing permissions, there
1032 * are still allow permissions - delete the deny.
1033 * It is safe to delete the deny here,
1034 * as we are guarenteed by the deny first
1035 * ordering that all the deny entries for
1036 * this SID have already been merged into one
1037 * before we can get to an allow ace.
1038 */
1039
1040 DLIST_REMOVE(l_head, curr_ace_outer);
1041 TALLOC_FREE(curr_ace_outer);
1042 break;
1043 }
1044 }
1045
1046 } /* end for curr_ace */
1047 } /* end for curr_ace_outer */
1048
1049 /* We may have modified the list. */
1050
1051 *pp_list_head = l_head;
1052 }
1053
1054 /****************************************************************************
1055 Check if we need to return NT4.x compatible ACL entries.
1056 ****************************************************************************/
1057
1058 bool nt4_compatible_acls(void)
1059 {
1060 int compat = lp_acl_compatibility();
1061
1062 if (compat == ACL_COMPAT_AUTO) {
1063 enum remote_arch_types ra_type = get_remote_arch();
1064
1065 /* Automatically adapt to client */
1066 return (ra_type <= RA_WINNT);
1067 } else
1068 return (compat == ACL_COMPAT_WINNT);
1069 }
1070
1071
1072 /****************************************************************************
1073 Map canon_ace perms to permission bits NT.
1074 The attr element is not used here - we only process deny entries on set,
1075 not get. Deny entries are implicit on get with ace->perms = 0.
1076 ****************************************************************************/
1077
1078 uint32_t map_canon_ace_perms(int snum,
1079 enum security_ace_type *pacl_type,
1080 mode_t perms,
1081 bool directory_ace)
1082 {
1083 uint32_t nt_mask = 0;
1084
1085 *pacl_type = SEC_ACE_TYPE_ACCESS_ALLOWED;
1086
1087 if (lp_acl_map_full_control(snum) && ((perms & ALL_ACE_PERMS) == ALL_ACE_PERMS)) {
1088 if (directory_ace) {
1089 nt_mask = UNIX_DIRECTORY_ACCESS_RWX;
1090 } else {
1091 nt_mask = (UNIX_ACCESS_RWX & ~DELETE_ACCESS);
1092 }
1093 } else if ((perms & ALL_ACE_PERMS) == (mode_t)0) {
1094 /*
1095 * Windows NT refuses to display ACEs with no permissions in them (but
1096 * they are perfectly legal with Windows 2000). If the ACE has empty
1097 * permissions we cannot use 0, so we use the otherwise unused
1098 * WRITE_OWNER permission, which we ignore when we set an ACL.
1099 * We abstract this into a #define of UNIX_ACCESS_NONE to allow this
1100 * to be changed in the future.
1101 */
1102
1103 if (nt4_compatible_acls())
1104 nt_mask = UNIX_ACCESS_NONE;
1105 else
1106 nt_mask = 0;
1107 } else {
1108 if (directory_ace) {
1109 nt_mask |= ((perms & S_IRUSR) ? UNIX_DIRECTORY_ACCESS_R : 0 );
1110 nt_mask |= ((perms & S_IWUSR) ? UNIX_DIRECTORY_ACCESS_W : 0 );
1111 nt_mask |= ((perms & S_IXUSR) ? UNIX_DIRECTORY_ACCESS_X : 0 );
1112 } else {
1113 nt_mask |= ((perms & S_IRUSR) ? UNIX_ACCESS_R : 0 );
1114 nt_mask |= ((perms & S_IWUSR) ? UNIX_ACCESS_W : 0 );
1115 nt_mask |= ((perms & S_IXUSR) ? UNIX_ACCESS_X : 0 );
1116 }
1117 }
1118
1119 if ((perms & S_IWUSR) && lp_dos_filemode(snum)) {
1120 nt_mask |= (SEC_STD_WRITE_DAC|SEC_STD_WRITE_OWNER|DELETE_ACCESS);
1121 }
1122
1123 DEBUG(10,("map_canon_ace_perms: Mapped (UNIX) %x to (NT) %x\n",
1124 (unsigned int)perms, (unsigned int)nt_mask ));
1125
1126 return nt_mask;
1127 }
1128
1129 /****************************************************************************
1130 Map NT perms to a UNIX mode_t.
1131 ****************************************************************************/
1132
1133 #define FILE_SPECIFIC_READ_BITS (FILE_READ_DATA|FILE_READ_EA)
1134 #define FILE_SPECIFIC_WRITE_BITS (FILE_WRITE_DATA|FILE_APPEND_DATA|FILE_WRITE_EA)
1135 #define FILE_SPECIFIC_EXECUTE_BITS (FILE_EXECUTE)
1136
1137 static mode_t map_nt_perms( uint32 *mask, int type)
1138 {
1139 mode_t mode = 0;
1140
1141 switch(type) {
1142 case S_IRUSR:
1143 if((*mask) & GENERIC_ALL_ACCESS)
1144 mode = S_IRUSR|S_IWUSR|S_IXUSR;
1145 else {
1146 mode |= ((*mask) & (GENERIC_READ_ACCESS|FILE_SPECIFIC_READ_BITS)) ? S_IRUSR : 0;
1147 mode |= ((*mask) & (GENERIC_WRITE_ACCESS|FILE_SPECIFIC_WRITE_BITS)) ? S_IWUSR : 0;
1148 mode |= ((*mask) & (GENERIC_EXECUTE_ACCESS|FILE_SPECIFIC_EXECUTE_BITS)) ? S_IXUSR : 0;
1149 }
1150 break;
1151 case S_IRGRP:
1152 if((*mask) & GENERIC_ALL_ACCESS)
1153 mode = S_IRGRP|S_IWGRP|S_IXGRP;
1154 else {
1155 mode |= ((*mask) & (GENERIC_READ_ACCESS|FILE_SPECIFIC_READ_BITS)) ? S_IRGRP : 0;
1156 mode |= ((*mask) & (GENERIC_WRITE_ACCESS|FILE_SPECIFIC_WRITE_BITS)) ? S_IWGRP : 0;
1157 mode |= ((*mask) & (GENERIC_EXECUTE_ACCESS|FILE_SPECIFIC_EXECUTE_BITS)) ? S_IXGRP : 0;
1158 }
1159 break;
1160 case S_IROTH:
1161 if((*mask) & GENERIC_ALL_ACCESS)
1162 mode = S_IROTH|S_IWOTH|S_IXOTH;
1163 else {
1164 mode |= ((*mask) & (GENERIC_READ_ACCESS|FILE_SPECIFIC_READ_BITS)) ? S_IROTH : 0;
1165 mode |= ((*mask) & (GENERIC_WRITE_ACCESS|FILE_SPECIFIC_WRITE_BITS)) ? S_IWOTH : 0;
1166 mode |= ((*mask) & (GENERIC_EXECUTE_ACCESS|FILE_SPECIFIC_EXECUTE_BITS)) ? S_IXOTH : 0;
1167 }
1168 break;
1169 }
1170
1171 return mode;
1172 }
1173
1174 /****************************************************************************
1175 Unpack a struct security_descriptor into a UNIX owner and group.
1176 ****************************************************************************/
1177
1178 NTSTATUS unpack_nt_owners(struct connection_struct *conn,
1179 uid_t *puser, gid_t *pgrp,
1180 uint32 security_info_sent, const struct
1181 security_descriptor *psd)
1182 {
1183 struct dom_sid owner_sid;
1184 struct dom_sid grp_sid;
1185
1186 *puser = (uid_t)-1;
1187 *pgrp = (gid_t)-1;
1188
1189 if(security_info_sent == 0) {
1190 DEBUG(0,("unpack_nt_owners: no security info sent !\n"));
1191 return NT_STATUS_OK;
1192 }
1193
1194 /*
1195 * Validate the owner and group SID's.
1196 */
1197
1198 memset(&owner_sid, '\0', sizeof(owner_sid));
1199 memset(&grp_sid, '\0', sizeof(grp_sid));
1200
1201 DEBUG(5,("unpack_nt_owners: validating owner_sids.\n"));
1202
1203 /*
1204 * Don't immediately fail if the owner sid cannot be validated.
1205 * This may be a group chown only set.
1206 */
1207
1208 if (security_info_sent & SECINFO_OWNER) {
1209 sid_copy(&owner_sid, psd->owner_sid);
1210 if (!sid_to_uid(&owner_sid, puser)) {
1211 if (lp_force_unknown_acl_user(SNUM(conn))) {
1212 /* this allows take ownership to work
1213 * reasonably */
1214 *puser = get_current_uid(conn);
1215 } else {
1216 DEBUG(3,("unpack_nt_owners: unable to validate"
1217 " owner sid for %s\n",
1218 sid_string_dbg(&owner_sid)));
1219 return NT_STATUS_INVALID_OWNER;
1220 }
1221 }
1222 DEBUG(3,("unpack_nt_owners: owner sid mapped to uid %u\n",
1223 (unsigned int)*puser ));
1224 }
1225
1226 /*
1227 * Don't immediately fail if the group sid cannot be validated.
1228 * This may be an owner chown only set.
1229 */
1230
1231 if (security_info_sent & SECINFO_GROUP) {
1232 sid_copy(&grp_sid, psd->group_sid);
1233 if (!sid_to_gid( &grp_sid, pgrp)) {
1234 if (lp_force_unknown_acl_user(SNUM(conn))) {
1235 /* this allows take group ownership to work
1236 * reasonably */
1237 *pgrp = get_current_gid(conn);
1238 } else {
1239 DEBUG(3,("unpack_nt_owners: unable to validate"
1240 " group sid.\n"));
1241 return NT_STATUS_INVALID_OWNER;
1242 }
1243 }
1244 DEBUG(3,("unpack_nt_owners: group sid mapped to gid %u\n",
1245 (unsigned int)*pgrp));
1246 }
1247
1248 DEBUG(5,("unpack_nt_owners: owner_sids validated.\n"));
1249
1250 return NT_STATUS_OK;
1251 }
1252
1253 /****************************************************************************
1254 Ensure the enforced permissions for this share apply.
1255 ****************************************************************************/
1256
1257 static void apply_default_perms(const struct share_params *params,
1258 const bool is_directory, canon_ace *pace,
1259 mode_t type)
1260 {
1261 mode_t and_bits = (mode_t)0;
1262 mode_t or_bits = (mode_t)0;
1263
1264 /* Get the initial bits to apply. */
1265
1266 if (is_directory) {
1267 and_bits = lp_dir_security_mask(params->service);
1268 or_bits = lp_force_dir_security_mode(params->service);
1269 } else {
1270 and_bits = lp_security_mask(params->service);
1271 or_bits = lp_force_security_mode(params->service);
1272 }
1273
1274 /* Now bounce them into the S_USR space. */
1275 switch(type) {
1276 case S_IRUSR:
1277 /* Ensure owner has read access. */
1278 pace->perms |= S_IRUSR;
1279 if (is_directory)
1280 pace->perms |= (S_IWUSR|S_IXUSR);
1281 and_bits = unix_perms_to_acl_perms(and_bits, S_IRUSR, S_IWUSR, S_IXUSR);
1282 or_bits = unix_perms_to_acl_perms(or_bits, S_IRUSR, S_IWUSR, S_IXUSR);
1283 break;
1284 case S_IRGRP:
1285 and_bits = unix_perms_to_acl_perms(and_bits, S_IRGRP, S_IWGRP, S_IXGRP);
1286 or_bits = unix_perms_to_acl_perms(or_bits, S_IRGRP, S_IWGRP, S_IXGRP);
1287 break;
1288 case S_IROTH:
1289 and_bits = unix_perms_to_acl_perms(and_bits, S_IROTH, S_IWOTH, S_IXOTH);
1290 or_bits = unix_perms_to_acl_perms(or_bits, S_IROTH, S_IWOTH, S_IXOTH);
1291 break;
1292 }
1293
1294 pace->perms = ((pace->perms & and_bits)|or_bits);
1295 }
1296
1297 /****************************************************************************
1298 Check if a given uid/SID is in a group gid/SID. This is probably very
1299 expensive and will need optimisation. A *lot* of optimisation :-). JRA.
1300 ****************************************************************************/
1301
1302 static bool uid_entry_in_group(connection_struct *conn, canon_ace *uid_ace, canon_ace *group_ace )
1303 {
1304 const char *u_name = NULL;
1305
1306 /* "Everyone" always matches every uid. */
1307
1308 if (dom_sid_equal(&group_ace->trustee, &global_sid_World))
1309 return True;
1310
1311 /*
1312 * if it's the current user, we already have the unix token
1313 * and don't need to do the complex user_in_group_sid() call
1314 */
1315 if (uid_ace->unix_ug.uid == get_current_uid(conn)) {
1316 const struct security_unix_token *curr_utok = NULL;
1317 size_t i;
1318
1319 if (group_ace->unix_ug.gid == get_current_gid(conn)) {
1320 return True;
1321 }
1322
1323 curr_utok = get_current_utok(conn);
1324 for (i=0; i < curr_utok->ngroups; i++) {
1325 if (group_ace->unix_ug.gid == curr_utok->groups[i]) {
1326 return True;
1327 }
1328 }
1329 }
1330
1331 /* u_name talloc'ed off tos. */
1332 u_name = uidtoname(uid_ace->unix_ug.uid);
1333 if (!u_name) {
1334 return False;
1335 }
1336
1337 /*
1338 * user_in_group_sid() uses create_token_from_username()
1339 * which creates an artificial NT token given just a username,
1340 * so this is not reliable for users from foreign domains
1341 * exported by winbindd!
1342 */
1343 return user_in_group_sid(u_name, &group_ace->trustee);
1344 }
1345
1346 /****************************************************************************
1347 A well formed POSIX file or default ACL has at least 3 entries, a
1348 SMB_ACL_USER_OBJ, SMB_ACL_GROUP_OBJ, SMB_ACL_OTHER_OBJ.
1349 In addition, the owner must always have at least read access.
1350 When using this call on get_acl, the pst struct is valid and contains
1351 the mode of the file. When using this call on set_acl, the pst struct has
1352 been modified to have a mode containing the default for this file or directory
1353 type.
1354 ****************************************************************************/
1355
1356 static bool ensure_canon_entry_valid(connection_struct *conn, canon_ace **pp_ace,
1357 const struct share_params *params,
1358 const bool is_directory,
1359 const struct dom_sid *pfile_owner_sid,
1360 const struct dom_sid *pfile_grp_sid,
1361 const SMB_STRUCT_STAT *pst,
1362 bool setting_acl)
1363 {
1364 canon_ace *pace;
1365 canon_ace *pace_user = NULL;
1366 canon_ace *pace_group = NULL;
1367 canon_ace *pace_other = NULL;
1368
1369 for (pace = *pp_ace; pace; pace = pace->next) {
1370 if (pace->type == SMB_ACL_USER_OBJ) {
1371
1372 if (setting_acl)
1373 apply_default_perms(params, is_directory, pace, S_IRUSR);
1374 pace_user = pace;
1375
1376 } else if (pace->type == SMB_ACL_GROUP_OBJ) {
1377
1378 /*
1379 * Ensure create mask/force create mode is respected on set.
1380 */
1381
1382 if (setting_acl)
1383 apply_default_perms(params, is_directory, pace, S_IRGRP);
1384 pace_group = pace;
1385
1386 } else if (pace->type == SMB_ACL_OTHER) {
1387
1388 /*
1389 * Ensure create mask/force create mode is respected on set.
1390 */
1391
1392 if (setting_acl)
1393 apply_default_perms(params, is_directory, pace, S_IROTH);
1394 pace_other = pace;
1395 }
1396 }
1397
1398 if (!pace_user) {
1399 if ((pace = talloc(talloc_tos(), canon_ace)) == NULL) {
1400 DEBUG(0,("ensure_canon_entry_valid: malloc fail.\n"));
1401 return False;
1402 }
1403
1404 ZERO_STRUCTP(pace);
1405 pace->type = SMB_ACL_USER_OBJ;
1406 pace->owner_type = UID_ACE;
1407 pace->unix_ug.uid = 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.
1417 If so, OR in the permissions from that entry. */
1418
1419 canon_ace *pace_iter;
1420
1421 for (pace_iter = *pp_ace; pace_iter; pace_iter = pace_iter->next) {
1422 if (pace_iter->type == SMB_ACL_USER &&
1423 pace_iter->unix_ug.uid == pace->unix_ug.uid) {
1424 pace->perms |= pace_iter->perms;
1425 } else if (pace_iter->type == SMB_ACL_GROUP_OBJ || pace_iter->type == SMB_ACL_GROUP) {
1426 if (uid_entry_in_group(conn, pace, pace_iter)) {
1427 pace->perms |= pace_iter->perms;
1428 }
1429 }
1430 }
1431
1432 if (pace->perms == 0) {
1433 /* If we only got an "everyone" perm, just use that. */
1434 if (pace_other)
1435 pace->perms = pace_other->perms;
1436 }
1437
1438 apply_default_perms(params, is_directory, pace, S_IRUSR);
1439 } else {
1440 pace->perms = unix_perms_to_acl_perms(pst->st_ex_mode, S_IRUSR, S_IWUSR, S_IXUSR);
1441 }
1442
1443 DLIST_ADD(*pp_ace, pace);
1444 pace_user = pace;
1445 }
1446
1447 if (!pace_group) {
1448 if ((pace = talloc(talloc_tos(), canon_ace)) == NULL) {
1449 DEBUG(0,("ensure_canon_entry_valid: malloc fail.\n"));
1450 return False;
1451 }
1452
1453 ZERO_STRUCTP(pace);
1454 pace->type = SMB_ACL_GROUP_OBJ;
1455 pace->owner_type = GID_ACE;
1456 pace->unix_ug.gid = pst->st_ex_gid;
1457 pace->trustee = *pfile_grp_sid;
1458 pace->attr = ALLOW_ACE;
1459 if (setting_acl) {
1460 /* If we only got an "everyone" perm, just use that. */
1461 if (pace_other)
1462 pace->perms = pace_other->perms;
1463 else
1464 pace->perms = 0;
1465 apply_default_perms(params, is_directory, pace, S_IRGRP);
1466 } else {
1467 pace->perms = unix_perms_to_acl_perms(pst->st_ex_mode, S_IRGRP, S_IWGRP, S_IXGRP);
1468 }
1469
1470 DLIST_ADD(*pp_ace, pace);
1471 pace_group = pace;
1472 }
1473
1474 if (!pace_other) {
1475 if ((pace = talloc(talloc_tos(), canon_ace)) == NULL) {
1476 DEBUG(0,("ensure_canon_entry_valid: malloc fail.\n"));
1477 return False;
1478 }
1479
1480 ZERO_STRUCTP(pace);
1481 pace->type = SMB_ACL_OTHER;
1482 pace->owner_type = WORLD_ACE;
1483 pace->unix_ug.world = -1;
1484 pace->trustee = global_sid_World;
1485 pace->attr = ALLOW_ACE;
1486 if (setting_acl) {
1487 pace->perms = 0;
1488 apply_default_perms(params, is_directory, pace, S_IROTH);
1489 } else
1490 pace->perms = unix_perms_to_acl_perms(pst->st_ex_mode, S_IROTH, S_IWOTH, S_IXOTH);
1491
1492 DLIST_ADD(*pp_ace, pace);
1493 pace_other = pace;
1494 }
1495
1496 if (setting_acl) {
1497 /* Ensure when setting a POSIX ACL, that the uid for a
1498 SMB_ACL_USER_OBJ ACE (the owner ACE entry) has a duplicate
1499 permission entry as an SMB_ACL_USER, and a gid for a
1500 SMB_ACL_GROUP_OBJ ACE (the primary group ACE entry) also has
1501 a duplicate permission entry as an SMB_ACL_GROUP. If not,
1502 then if the ownership or group ownership of this file or
1503 directory gets changed, the user or group can lose their
1504 access. */
1505 bool got_duplicate_user = false;
1506 bool got_duplicate_group = false;
1507
1508 for (pace = *pp_ace; pace; pace = pace->next) {
1509 if (pace->type == SMB_ACL_USER &&
1510 pace->unix_ug.uid == pace_user->unix_ug.uid) {
1511 /* Already got one. */
1512 got_duplicate_user = true;
1513 } else if (pace->type == SMB_ACL_GROUP &&
1514 pace->unix_ug.gid == pace_user->unix_ug.gid) {
1515 /* Already got one. */
1516 got_duplicate_group = true;
1517 }
1518 }
1519
1520 if (!got_duplicate_user) {
1521 /* Add a duplicate SMB_ACL_USER entry. */
1522 if ((pace = talloc(talloc_tos(), canon_ace)) == NULL) {
1523 DEBUG(0,("ensure_canon_entry_valid: talloc fail.\n"));
1524 return false;
1525 }
1526
1527 ZERO_STRUCTP(pace);
1528 pace->type = SMB_ACL_USER;;
1529 pace->owner_type = UID_ACE;
1530 pace->unix_ug.uid = pace_user->unix_ug.uid;
1531 pace->trustee = pace_user->trustee;
1532 pace->attr = pace_user->attr;
1533 pace->perms = pace_user->perms;
1534
1535 DLIST_ADD(*pp_ace, pace);
1536 }
1537
1538 if (!got_duplicate_group) {
1539 /* Add a duplicate SMB_ACL_GROUP entry. */
1540 if ((pace = talloc(talloc_tos(), canon_ace)) == NULL) {
1541 DEBUG(0,("ensure_canon_entry_valid: talloc fail.\n"));
1542 return false;
1543 }
1544
1545 ZERO_STRUCTP(pace);
1546 pace->type = SMB_ACL_GROUP;;
1547 pace->owner_type = GID_ACE;
1548 pace->unix_ug.gid = pace_group->unix_ug.gid;
1549 pace->trustee = pace_group->trustee;
1550 pace->attr = pace_group->attr;
1551 pace->perms = pace_group->perms;
1552
1553 DLIST_ADD(*pp_ace, pace);
1554 }
1555
1556 }
1557
1558 return True;
1559 }
1560
1561 /****************************************************************************
1562 Check if a POSIX ACL has the required SMB_ACL_USER_OBJ and SMB_ACL_GROUP_OBJ entries.
1563 If it does not have them, check if there are any entries where the trustee is the
1564 file owner or the owning group, and map these to SMB_ACL_USER_OBJ and SMB_ACL_GROUP_OBJ.
1565 Note we must not do this to default directory ACLs.
1566 ****************************************************************************/
1567
1568 static void check_owning_objs(canon_ace *ace, struct dom_sid *pfile_owner_sid, struct dom_sid *pfile_grp_sid)
1569 {
1570 bool got_user_obj, got_group_obj;
1571 canon_ace *current_ace;
1572 int i, entries;
1573
1574 entries = count_canon_ace_list(ace);
1575 got_user_obj = False;
1576 got_group_obj = False;
1577
1578 for (i=0, current_ace = ace; i < entries; i++, current_ace = current_ace->next) {
1579 if (current_ace->type == SMB_ACL_USER_OBJ)
1580 got_user_obj = True;
1581 else if (current_ace->type == SMB_ACL_GROUP_OBJ)
1582 got_group_obj = True;
1583 }
1584 if (got_user_obj && got_group_obj) {
1585 DEBUG(10,("check_owning_objs: ACL had owning user/group entries.\n"));
1586 return;
1587 }
1588
1589 for (i=0, current_ace = ace; i < entries; i++, current_ace = current_ace->next) {
1590 if (!got_user_obj && current_ace->owner_type == UID_ACE &&
1591 dom_sid_equal(&current_ace->trustee, pfile_owner_sid)) {
1592 current_ace->type = SMB_ACL_USER_OBJ;
1593 got_user_obj = True;
1594 }
1595 if (!got_group_obj && current_ace->owner_type == GID_ACE &&
1596 dom_sid_equal(&current_ace->trustee, pfile_grp_sid)) {
1597 current_ace->type = SMB_ACL_GROUP_OBJ;
1598 got_group_obj = True;
1599 }
1600 }
1601 if (!got_user_obj)
1602 DEBUG(10,("check_owning_objs: ACL is missing an owner entry.\n"));
1603 if (!got_group_obj)
1604 DEBUG(10,("check_owning_objs: ACL is missing an owning group entry.\n"));
1605 }
1606
1607 /****************************************************************************
1608 Unpack a struct security_descriptor into two canonical ace lists.
1609 ****************************************************************************/
1610
1611 static bool create_canon_ace_lists(files_struct *fsp,
1612 const SMB_STRUCT_STAT *pst,
1613 struct dom_sid *pfile_owner_sid,
1614 struct dom_sid *pfile_grp_sid,
1615 canon_ace **ppfile_ace,
1616 canon_ace **ppdir_ace,
1617 const struct security_acl *dacl)
1618 {
1619 bool all_aces_are_inherit_only = (fsp->is_directory ? True : False);
1620 canon_ace *file_ace = NULL;
1621 canon_ace *dir_ace = NULL;
1622 canon_ace *current_ace = NULL;
1623 bool got_dir_allow = False;
1624 bool got_file_allow = False;
1625 int i, j;
1626
1627 *ppfile_ace = NULL;
1628 *ppdir_ace = NULL;
1629
1630 /*
1631 * Convert the incoming ACL into a more regular form.
1632 */
1633
1634 for(i = 0; i < dacl->num_aces; i++) {
1635 struct security_ace *psa = &dacl->aces[i];
1636
1637 if((psa->type != SEC_ACE_TYPE_ACCESS_ALLOWED) && (psa->type != SEC_ACE_TYPE_ACCESS_DENIED)) {
1638 DEBUG(3,("create_canon_ace_lists: unable to set anything but an ALLOW or DENY ACE.\n"));
1639 return False;
1640 }
1641
1642 if (nt4_compatible_acls()) {
1643 /*
1644 * The security mask may be UNIX_ACCESS_NONE which should map into
1645 * no permissions (we overload the WRITE_OWNER bit for this) or it
1646 * should be one of the ALL/EXECUTE/READ/WRITE bits. Arrange for this
1647 * to be so. Any other bits override the UNIX_ACCESS_NONE bit.
1648 */
1649
1650 /*
1651 * Convert GENERIC bits to specific bits.
1652 */
1653
1654 se_map_generic(&psa->access_mask, &file_generic_mapping);
1655
1656 psa->access_mask &= (UNIX_ACCESS_NONE|FILE_ALL_ACCESS);
1657
1658 if(psa->access_mask != UNIX_ACCESS_NONE)
1659 psa->access_mask &= ~UNIX_ACCESS_NONE;
1660 }
1661 }
1662
1663 /*
1664 * Deal with the fact that NT 4.x re-writes the canonical format
1665 * that we return for default ACLs. If a directory ACE is identical
1666 * to a inherited directory ACE then NT changes the bits so that the
1667 * first ACE is set to OI|IO and the second ACE for this SID is set
1668 * to CI. We need to repair this. JRA.
1669 */
1670
1671 for(i = 0; i < dacl->num_aces; i++) {
1672 struct security_ace *psa1 = &dacl->aces[i];
1673
1674 for (j = i + 1; j < dacl->num_aces; j++) {
1675 struct security_ace *psa2 = &dacl->aces[j];
1676
1677 if (psa1->access_mask != psa2->access_mask)
1678 continue;
1679
1680 if (!dom_sid_equal(&psa1->trustee, &psa2->trustee))
1681 continue;
1682
1683 /*
1684 * Ok - permission bits and SIDs are equal.
1685 * Check if flags were re-written.
1686 */
1687
1688 if (psa1->flags & SEC_ACE_FLAG_INHERIT_ONLY) {
1689
1690 psa1->flags |= (psa2->flags & (SEC_ACE_FLAG_CONTAINER_INHERIT|SEC_ACE_FLAG_OBJECT_INHERIT));
1691 psa2->flags &= ~(SEC_ACE_FLAG_CONTAINER_INHERIT|SEC_ACE_FLAG_OBJECT_INHERIT);
1692
1693 } else if (psa2->flags & SEC_ACE_FLAG_INHERIT_ONLY) {
1694
1695 psa2->flags |= (psa1->flags & (SEC_ACE_FLAG_CONTAINER_INHERIT|SEC_ACE_FLAG_OBJECT_INHERIT));
1696 psa1->flags &= ~(SEC_ACE_FLAG_CONTAINER_INHERIT|SEC_ACE_FLAG_OBJECT_INHERIT);
1697
1698 }
1699 }
1700 }
1701
1702 for(i = 0; i < dacl->num_aces; i++) {
1703 struct security_ace *psa = &dacl->aces[i];
1704
1705 /*
1706 * Create a canon_ace entry representing this NT DACL ACE.
1707 */
1708
1709 if ((current_ace = talloc(talloc_tos(), canon_ace)) == NULL) {
1710 free_canon_ace_list(file_ace);
1711 free_canon_ace_list(dir_ace);
1712 DEBUG(0,("create_canon_ace_lists: malloc fail.\n"));
1713 return False;
1714 }
1715
1716 ZERO_STRUCTP(current_ace);
1717
1718 sid_copy(&current_ace->trustee, &psa->trustee);
1719
1720 /*
1721 * Try and work out if the SID is a user or group
1722 * as we need to flag these differently for POSIX.
1723 * Note what kind of a POSIX ACL this should map to.
1724 */
1725
1726 if( dom_sid_equal(&current_ace->trustee, &global_sid_World)) {
1727 current_ace->owner_type = WORLD_ACE;
1728 current_ace->unix_ug.world = -1;
1729 current_ace->type = SMB_ACL_OTHER;
1730 } else if (dom_sid_equal(&current_ace->trustee, &global_sid_Creator_Owner)) {
1731 current_ace->owner_type = UID_ACE;
1732 current_ace->unix_ug.uid = pst->st_ex_uid;
1733 current_ace->type = SMB_ACL_USER_OBJ;
1734
1735 /*
1736 * The Creator Owner entry only specifies inheritable permissions,
1737 * never access permissions. WinNT doesn't always set the ACE to
1738 * INHERIT_ONLY, though.
1739 */
1740
1741 psa->flags |= SEC_ACE_FLAG_INHERIT_ONLY;
1742
1743 } else if (dom_sid_equal(&current_ace->trustee, &global_sid_Creator_Group)) {
1744 current_ace->owner_type = GID_ACE;
1745 current_ace->unix_ug.gid = pst->st_ex_gid;
1746 current_ace->type = SMB_ACL_GROUP_OBJ;
1747
1748 /*
1749 * The Creator Group entry only specifies inheritable permissions,
1750 * never access permissions. WinNT doesn't always set the ACE to
1751 * INHERIT_ONLY, though.
1752 */
1753 psa->flags |= SEC_ACE_FLAG_INHERIT_ONLY;
1754
1755 } else if (sid_to_uid( &current_ace->trustee, &current_ace->unix_ug.uid)) {
1756 current_ace->owner_type = UID_ACE;
1757 /* If it's the owning user, this is a user_obj, not
1758 * a user. */
1759 if (current_ace->unix_ug.uid == pst->st_ex_uid) {
1760 current_ace->type = SMB_ACL_USER_OBJ;
1761 } else {
1762 current_ace->type = SMB_ACL_USER;
1763 }
1764 } else if (sid_to_gid( &current_ace->trustee, &current_ace->unix_ug.gid)) {
1765 current_ace->owner_type = GID_ACE;
1766 /* If it's the primary group, this is a group_obj, not
1767 * a group. */
1768 if (current_ace->unix_ug.gid == pst->st_ex_gid) {
1769 current_ace->type = SMB_ACL_GROUP_OBJ;
1770 } else {
1771 current_ace->type = SMB_ACL_GROUP;
1772 }
1773 } else {
1774 /*
1775 * Silently ignore map failures in non-mappable SIDs (NT Authority, BUILTIN etc).
1776 */
1777
1778 if (non_mappable_sid(&psa->trustee)) {
1779 DEBUG(10, ("create_canon_ace_lists: ignoring "
1780 "non-mappable SID %s\n",
1781 sid_string_dbg(&psa->trustee)));
1782 TALLOC_FREE(current_ace);
1783 continue;
1784 }
1785
1786 if (lp_force_unknown_acl_user(SNUM(fsp->conn))) {
1787 DEBUG(10, ("create_canon_ace_lists: ignoring "
1788 "unknown or foreign SID %s\n",
1789 sid_string_dbg(&psa->trustee)));
1790 TALLOC_FREE(current_ace);
1791 continue;
1792 }
1793
1794 free_canon_ace_list(file_ace);
1795 free_canon_ace_list(dir_ace);
1796 DEBUG(0, ("create_canon_ace_lists: unable to map SID "
1797 "%s to uid or gid.\n",
1798 sid_string_dbg(&current_ace->trustee)));
1799 TALLOC_FREE(current_ace);
1800 return False;
1801 }
1802
1803 /*
1804 * Map the given NT permissions into a UNIX mode_t containing only
1805 * S_I(R|W|X)USR bits.
1806 */
1807
1808 current_ace->perms |= map_nt_perms( &psa->access_mask, S_IRUSR);
1809 current_ace->attr = (psa->type == SEC_ACE_TYPE_ACCESS_ALLOWED) ? ALLOW_ACE : DENY_ACE;
1810
1811 /* Store the ace_flag. */
1812 current_ace->ace_flags = psa->flags;
1813
1814 /*
1815 * Now add the created ace to either the file list, the directory
1816 * list, or both. We *MUST* preserve the order here (hence we use
1817 * DLIST_ADD_END) as NT ACLs are order dependent.
1818 */
1819
1820 if (fsp->is_directory) {
1821
1822 /*
1823 * We can only add to the default POSIX ACE list if the ACE is
1824 * designed to be inherited by both files and directories.
1825 */
1826
1827 if ((psa->flags & (SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT)) ==
1828 (SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT)) {
1829
1830 canon_ace *current_dir_ace = current_ace;
1831 DLIST_ADD_END(dir_ace, current_ace, canon_ace *);
1832
1833 /*
1834 * Note if this was an allow ace. We can't process
1835 * any further deny ace's after this.
1836 */
1837
1838 if (current_ace->attr == ALLOW_ACE)
1839 got_dir_allow = True;
1840
1841 if ((current_ace->attr == DENY_ACE) && got_dir_allow) {
1842 DEBUG(0,("create_canon_ace_lists: "
1843 "malformed ACL in "
1844 "inheritable ACL! Deny entry "
1845 "after Allow entry. Failing "
1846 "to set on file %s.\n",
1847 fsp_str_dbg(fsp)));
1848 free_canon_ace_list(file_ace);
1849 free_canon_ace_list(dir_ace);
1850 return False;
1851 }
1852
1853 if( DEBUGLVL( 10 )) {
1854 dbgtext("create_canon_ace_lists: adding dir ACL:\n");
1855 print_canon_ace( current_ace, 0);
1856 }
1857
1858 /*
1859 * If this is not an inherit only ACE we need to add a duplicate
1860 * to the file acl.
1861 */
1862
1863 if (!(psa->flags & SEC_ACE_FLAG_INHERIT_ONLY)) {
1864 canon_ace *dup_ace = dup_canon_ace(current_ace);
1865
1866 if (!dup_ace) {
1867 DEBUG(0,("create_canon_ace_lists: malloc fail !\n"));
1868 free_canon_ace_list(file_ace);
1869 free_canon_ace_list(dir_ace);
1870 return False;
1871 }
1872
1873 /*
1874 * We must not free current_ace here as its
1875 * pointer is now owned by the dir_ace list.
1876 */
1877 current_ace = dup_ace;
1878 /* We've essentially split this ace into two,
1879 * and added the ace with inheritance request
1880 * bits to the directory ACL. Drop those bits for
1881 * the ACE we're adding to the file list. */
1882 current_ace->ace_flags &= ~(SEC_ACE_FLAG_OBJECT_INHERIT|
1883 SEC_ACE_FLAG_CONTAINER_INHERIT|
1884 SEC_ACE_FLAG_INHERIT_ONLY);
1885 } else {
1886 /*
1887 * We must not free current_ace here as its
1888 * pointer is now owned by the dir_ace list.
1889 */
1890 current_ace = NULL;
1891 }
1892
1893 /*
1894 * current_ace is now either owned by file_ace
1895 * or is NULL. We can safely operate on current_dir_ace
1896 * to treat mapping for default acl entries differently
1897 * than access acl entries.
1898 */
1899
1900 if (current_dir_ace->owner_type == UID_ACE) {
1901 /*
1902 * We already decided above this is a uid,
1903 * for default acls ace's only CREATOR_OWNER
1904 * maps to ACL_USER_OBJ. All other uid
1905 * ace's are ACL_USER.
1906 */
1907 if (dom_sid_equal(&current_dir_ace->trustee,
1908 &global_sid_Creator_Owner)) {
1909 current_dir_ace->type = SMB_ACL_USER_OBJ;
1910 } else {
1911 current_dir_ace->type = SMB_ACL_USER;
1912 }
1913 }
1914
1915 if (current_dir_ace->owner_type == GID_ACE) {
1916 /*
1917 * We already decided above this is a gid,
1918 * for default acls ace's only CREATOR_GROUP
1919 * maps to ACL_GROUP_OBJ. All other uid
1920 * ace's are ACL_GROUP.
1921 */
1922 if (dom_sid_equal(&current_dir_ace->trustee,
1923 &global_sid_Creator_Group)) {
1924 current_dir_ace->type = SMB_ACL_GROUP_OBJ;
1925 } else {
1926 current_dir_ace->type = SMB_ACL_GROUP;
1927 }
1928 }
1929 }
1930 }
1931
1932 /*
1933 * Only add to the file ACL if not inherit only.
1934 */
1935
1936 if (current_ace && !(psa->flags & SEC_ACE_FLAG_INHERIT_ONLY)) {
1937 DLIST_ADD_END(file_ace, current_ace, canon_ace *);
1938
1939 /*
1940 * Note if this was an allow ace. We can't process
1941 * any further deny ace's after this.
1942 */
1943
1944 if (current_ace->attr == ALLOW_ACE)
1945 got_file_allow = True;
1946
1947 if ((current_ace->attr == DENY_ACE) && got_file_allow) {
1948 DEBUG(0,("create_canon_ace_lists: malformed "
1949 "ACL in file ACL ! Deny entry after "
1950 "Allow entry. Failing to set on file "
1951 "%s.\n", fsp_str_dbg(fsp)));
1952 free_canon_ace_list(file_ace);
1953 free_canon_ace_list(dir_ace);
1954 return False;
1955 }
1956
1957 if( DEBUGLVL( 10 )) {
1958 dbgtext("create_canon_ace_lists: adding file ACL:\n");
1959 print_canon_ace( current_ace, 0);
1960 }
1961 all_aces_are_inherit_only = False;
1962 /*
1963 * We must not free current_ace here as its
1964 * pointer is now owned by the file_ace list.
1965 */
1966 current_ace = NULL;
1967 }
1968
1969 /*
1970 * Free if ACE was not added.
1971 */
1972
1973 TALLOC_FREE(current_ace);
1974 }
1975
1976 if (fsp->is_directory && all_aces_are_inherit_only) {
1977 /*
1978 * Windows 2000 is doing one of these weird 'inherit acl'
1979 * traverses to conserve NTFS ACL resources. Just pretend
1980 * there was no DACL sent. JRA.
1981 */
1982
1983 DEBUG(10,("create_canon_ace_lists: Win2k inherit acl traverse. Ignoring DACL.\n"));
1984 free_canon_ace_list(file_ace);
1985 free_canon_ace_list(dir_ace);
1986 file_ace = NULL;
1987 dir_ace = NULL;
1988 } else {
1989 /*
1990 * Check if we have SMB_ACL_USER_OBJ and SMB_ACL_GROUP_OBJ entries in
1991 * the file ACL. If we don't have them, check if any SMB_ACL_USER/SMB_ACL_GROUP
1992 * entries can be converted to *_OBJ. Don't do this for the default
1993 * ACL, we will create them separately for this if needed inside
1994 * ensure_canon_entry_valid().
1995 */
1996 if (file_ace) {
1997 check_owning_objs(file_ace, pfile_owner_sid, pfile_grp_sid);
1998 }
1999 }
2000
2001 *ppfile_ace = file_ace;
2002 *ppdir_ace = dir_ace;
2003
2004 return True;
2005 }
2006
2007 /****************************************************************************
2008 ASCII art time again... JRA :-).
2009
2010 We have 4 cases to process when moving from an NT ACL to a POSIX ACL. Firstly,
2011 we insist the ACL is in canonical form (ie. all DENY entries preceede ALLOW
2012 entries). Secondly, the merge code has ensured that all duplicate SID entries for
2013 allow or deny have been merged, so the same SID can only appear once in the deny
2014 list or once in the allow list.
2015
2016 We then process as follows :
2017
2018 ---------------------------------------------------------------------------
2019 First pass - look for a Everyone DENY entry.
2020
2021 If it is deny all (rwx) trunate the list at this point.
2022 Else, walk the list from this point and use the deny permissions of this
2023 entry as a mask on all following allow entries. Finally, delete
2024 the Everyone DENY entry (we have applied it to everything possible).
2025
2026 In addition, in this pass we remove any DENY entries that have
2027 no permissions (ie. they are a DENY nothing).
2028 ---------------------------------------------------------------------------
2029 Second pass - only deal with deny user entries.
2030
2031 DENY user1 (perms XXX)
2032
2033 new_perms = 0
2034 for all following allow group entries where user1 is in group
2035 new_perms |= group_perms;
2036
2037 user1 entry perms = new_perms & ~ XXX;
2038
2039 Convert the deny entry to an allow entry with the new perms and
2040 push to the end of the list. Note if the user was in no groups
2041 this maps to a specific allow nothing entry for this user.
2042
2043 The common case from the NT ACL choser (userX deny all) is
2044 optimised so we don't do the group lookup - we just map to
2045 an allow nothing entry.
2046
2047 What we're doing here is inferring the allow permissions the
2048 person setting the ACE on user1 wanted by looking at the allow
2049 permissions on the groups the user is currently in. This will
2050 be a snapshot, depending on group membership but is the best
2051 we can do and has the advantage of failing closed rather than
2052 open.
2053 ---------------------------------------------------------------------------
2054 Third pass - only deal with deny group entries.
2055
2056 DENY group1 (perms XXX)
2057
2058 for all following allow user entries where user is in group1
2059 user entry perms = user entry perms & ~ XXX;
2060
2061 If there is a group Everyone allow entry with permissions YYY,
2062 convert the group1 entry to an allow entry and modify its
2063 permissions to be :
2064
2065 new_perms = YYY & ~ XXX
2066
2067 and push to the end of the list.
2068
2069 If there is no group Everyone allow entry then convert the
2070 group1 entry to a allow nothing entry and push to the end of the list.
2071
2072 Note that the common case from the NT ACL choser (groupX deny all)
2073 cannot be optimised here as we need to modify user entries who are
2074 in the group to change them to a deny all also.
2075
2076 What we're doing here is modifying the allow permissions of
2077 user entries (which are more specific in POSIX ACLs) to mask
2078 out the explicit deny set on the group they are in. This will
2079 be a snapshot depending on current group membership but is the
2080 best we can do and has the advantage of failing closed rather
2081 than open.
2082 ---------------------------------------------------------------------------
2083 Fourth pass - cope with cumulative permissions.
2084
2085 for all allow user entries, if there exists an allow group entry with
2086 more permissive permissions, and the user is in that group, rewrite the
2087 allow user permissions to contain both sets of permissions.
2088
2089 Currently the code for this is #ifdef'ed out as these semantics make
2090 no sense to me. JRA.
2091 ---------------------------------------------------------------------------
2092
2093 Note we *MUST* do the deny user pass first as this will convert deny user
2094 entries into allow user entries which can then be processed by the deny
2095 group pass.
2096
2097 The above algorithm took a *lot* of thinking about - hence this
2098 explaination :-). JRA.
2099 ****************************************************************************/
2100
2101 /****************************************************************************
2102 Process a canon_ace list entries. This is very complex code. We need
2103 to go through and remove the "deny" permissions from any allow entry that matches
2104 the id of this entry. We have already refused any NT ACL that wasn't in correct
2105 order (DENY followed by ALLOW). If any allow entry ends up with zero permissions,
2106 we just remove it (to fail safe). We have already removed any duplicate ace
2107 entries. Treat an "Everyone" DENY_ACE as a special case - use it to mask all
2108 allow entries.
2109 ****************************************************************************/
2110
2111 static void process_deny_list(connection_struct *conn, canon_ace **pp_ace_list )
2112 {
2113 canon_ace *ace_list = *pp_ace_list;
2114 canon_ace *curr_ace = NULL;
2115 canon_ace *curr_ace_next = NULL;
2116
2117 /* Pass 1 above - look for an Everyone, deny entry. */
2118
2119 for (curr_ace = ace_list; curr_ace; curr_ace = curr_ace_next) {
2120 canon_ace *allow_ace_p;
2121
2122 curr_ace_next = curr_ace->next; /* So we can't lose the link. */
2123
2124 if (curr_ace->attr != DENY_ACE)
2125 continue;
2126
2127 if (curr_ace->perms == (mode_t)0) {
2128
2129 /* Deny nothing entry - delete. */
2130
2131 DLIST_REMOVE(ace_list, curr_ace);
2132 continue;
2133 }
2134
2135 if (!dom_sid_equal(&curr_ace->trustee, &global_sid_World))
2136 continue;
2137
2138 /* JRATEST - assert. */
2139 SMB_ASSERT(curr_ace->owner_type == WORLD_ACE);
2140
2141 if (curr_ace->perms == ALL_ACE_PERMS) {
2142
2143 /*
2144 * Optimisation. This is a DENY_ALL to Everyone. Truncate the
2145 * list at this point including this entry.
2146 */
2147
2148 canon_ace *prev_entry = DLIST_PREV(curr_ace);
2149
2150 free_canon_ace_list( curr_ace );
2151 if (prev_entry)
2152 DLIST_REMOVE(ace_list, prev_entry);
2153 else {
2154 /* We deleted the entire list. */
2155 ace_list = NULL;
2156 }
2157 break;
2158 }
2159
2160 for (allow_ace_p = curr_ace->next; allow_ace_p; allow_ace_p = allow_ace_p->next) {
2161
2162 /*
2163 * Only mask off allow entries.
2164 */
2165
2166 if (allow_ace_p->attr != ALLOW_ACE)
2167 continue;
2168
2169 allow_ace_p->perms &= ~curr_ace->perms;
2170 }
2171
2172 /*
2173 * Now it's been applied, remove it.
2174 */
2175
2176 DLIST_REMOVE(ace_list, curr_ace);
2177 }
2178
2179 /* Pass 2 above - deal with deny user entries. */
2180
2181 for (curr_ace = ace_list; curr_ace; curr_ace = curr_ace_next) {
2182 mode_t new_perms = (mode_t)0;
2183 canon_ace *allow_ace_p;
2184
2185 curr_ace_next = curr_ace->next; /* So we can't lose the link. */
2186
2187 if (curr_ace->attr != DENY_ACE)
2188 continue;
2189
2190 if (curr_ace->owner_type != UID_ACE)
2191 continue;
2192
2193 if (curr_ace->perms == ALL_ACE_PERMS) {
2194
2195 /*
2196 * Optimisation - this is a deny everything to this user.
2197 * Convert to an allow nothing and push to the end of the list.
2198 */
2199
2200 curr_ace->attr = ALLOW_ACE;
2201 curr_ace->perms = (mode_t)0;
2202 DLIST_DEMOTE(ace_list, curr_ace, canon_ace *);
2203 continue;
2204 }
2205
2206 for (allow_ace_p = curr_ace->next; allow_ace_p; allow_ace_p = allow_ace_p->next) {
2207
2208 if (allow_ace_p->attr != ALLOW_ACE)
2209 continue;
2210
2211 /* We process GID_ACE and WORLD_ACE entries only. */
2212
2213 if (allow_ace_p->owner_type == UID_ACE)
2214 continue;
2215
2216 if (uid_entry_in_group(conn, curr_ace, allow_ace_p))
2217 new_perms |= allow_ace_p->perms;
2218 }
2219
2220 /*
2221 * Convert to a allow entry, modify the perms and push to the end
2222 * of the list.
2223 */
2224
2225 curr_ace->attr = ALLOW_ACE;
2226 curr_ace->perms = (new_perms & ~curr_ace->perms);
2227 DLIST_DEMOTE(ace_list, curr_ace, canon_ace *);
2228 }
2229
2230 /* Pass 3 above - deal with deny group entries. */
2231
2232 for (curr_ace = ace_list; curr_ace; curr_ace = curr_ace_next) {
2233 canon_ace *allow_ace_p;
2234 canon_ace *allow_everyone_p = NULL;
2235
2236 curr_ace_next = curr_ace->next; /* So we can't lose the link. */
2237
2238 if (curr_ace->attr != DENY_ACE)
2239 continue;
2240
2241 if (curr_ace->owner_type != GID_ACE)
2242 continue;
2243
2244 for (allow_ace_p = curr_ace->next; allow_ace_p; allow_ace_p = allow_ace_p->next) {
2245
2246 if (allow_ace_p->attr != ALLOW_ACE)
2247 continue;
2248
2249 /* Store a pointer to the Everyone allow, if it exists. */
2250 if (allow_ace_p->owner_type == WORLD_ACE)
2251 allow_everyone_p = allow_ace_p;
2252
2253 /* We process UID_ACE entries only. */
2254
2255 if (allow_ace_p->owner_type != UID_ACE)
2256 continue;
2257
2258 /* Mask off the deny group perms. */
2259
2260 if (uid_entry_in_group(conn, allow_ace_p, curr_ace))
2261 allow_ace_p->perms &= ~curr_ace->perms;
2262 }
2263
2264 /*
2265 * Convert the deny to an allow with the correct perms and
2266 * push to the end of the list.
2267 */
2268
2269 curr_ace->attr = ALLOW_ACE;
2270 if (allow_everyone_p)
2271 curr_ace->perms = allow_everyone_p->perms & ~curr_ace->perms;
2272 else
2273 curr_ace->perms = (mode_t)0;
2274 DLIST_DEMOTE(ace_list, curr_ace, canon_ace *);
2275 }
2276
2277 /* Doing this fourth pass allows Windows semantics to be layered
2278 * on top of POSIX semantics. I'm not sure if this is desirable.
2279 * For example, in W2K ACLs there is no way to say, "Group X no
2280 * access, user Y full access" if user Y is a member of group X.
2281 * This seems completely broken semantics to me.... JRA.
2282 */
2283
2284 #if 0
2285 /* Pass 4 above - deal with allow entries. */
2286
2287 for (curr_ace = ace_list; curr_ace; curr_ace = curr_ace_next) {
2288 canon_ace *allow_ace_p;
2289
2290 curr_ace_next = curr_ace->next; /* So we can't lose the link. */
2291
2292 if (curr_ace->attr != ALLOW_ACE)
2293 continue;
2294
2295 if (curr_ace->owner_type != UID_ACE)
2296 continue;
2297
2298 for (allow_ace_p = ace_list; allow_ace_p; allow_ace_p = allow_ace_p->next) {
2299
2300 if (allow_ace_p->attr != ALLOW_ACE)
2301 continue;
2302
2303 /* We process GID_ACE entries only. */
2304
2305 if (allow_ace_p->owner_type != GID_ACE)
2306 continue;
2307
2308 /* OR in the group perms. */
2309
2310 if (uid_entry_in_group(conn, curr_ace, allow_ace_p))
2311 curr_ace->perms |= allow_ace_p->perms;
2312 }
2313 }
2314 #endif
2315
2316 *pp_ace_list = ace_list;
2317 }
2318
2319 /****************************************************************************
2320 Unpack a struct security_descriptor into two canonical ace lists. We don't depend on this
2321 succeeding.
2322 ****************************************************************************/
2323
2324 static bool unpack_canon_ace(files_struct *fsp,
2325 const SMB_STRUCT_STAT *pst,
2326 struct dom_sid *pfile_owner_sid,
2327 struct dom_sid *pfile_grp_sid,
2328 canon_ace **ppfile_ace,
2329 canon_ace **ppdir_ace,
2330 uint32 security_info_sent,
2331 const struct security_descriptor *psd)
2332 {
2333 canon_ace *file_ace = NULL;
2334 canon_ace *dir_ace = NULL;
2335
2336 *ppfile_ace = NULL;
2337 *ppdir_ace = NULL;
2338
2339 if(security_info_sent == 0) {
2340 DEBUG(0,("unpack_canon_ace: no security info sent !\n"));
2341 return False;
2342 }
2343
2344 /*
2345 * If no DACL then this is a chown only security descriptor.
2346 */
2347
2348 if(!(security_info_sent & SECINFO_DACL) || !psd->dacl)
2349 return True;
2350
2351 /*
2352 * Now go through the DACL and create the canon_ace lists.
2353 */
2354
2355 if (!create_canon_ace_lists( fsp, pst, pfile_owner_sid, pfile_grp_sid,
2356 &file_ace, &dir_ace, psd->dacl))
2357 return False;
2358
2359 if ((file_ace == NULL) && (dir_ace == NULL)) {
2360 /* W2K traverse DACL set - ignore. */
2361 return True;
2362 }
2363
2364 /*
2365 * Go through the canon_ace list and merge entries
2366 * belonging to identical users of identical allow or deny type.
2367 * We can do this as all deny entries come first, followed by
2368 * all allow entries (we have mandated this before accepting this acl).
2369 */
2370
2371 print_canon_ace_list( "file ace - before merge", file_ace);
2372 merge_aces( &file_ace, false);
2373
2374 print_canon_ace_list( "dir ace - before merge", dir_ace);
2375 merge_aces( &dir_ace, true);
2376
2377 /*
2378 * NT ACLs are order dependent. Go through the acl lists and
2379 * process DENY entries by masking the allow entries.
2380 */
2381
2382 print_canon_ace_list( "file ace - before deny", file_ace);
2383 process_deny_list(fsp->conn, &file_ace);
2384
2385 print_canon_ace_list( "dir ace - before deny", dir_ace);
2386 process_deny_list(fsp->conn, &dir_ace);
2387
2388 /*
2389 * A well formed POSIX file or default ACL has at least 3 entries, a
2390 * SMB_ACL_USER_OBJ, SMB_ACL_GROUP_OBJ, SMB_ACL_OTHER_OBJ
2391 * and optionally a mask entry. Ensure this is the case.
2392 */
2393
2394 print_canon_ace_list( "file ace - before valid", file_ace);
2395
2396 if (!ensure_canon_entry_valid(fsp->conn, &file_ace, fsp->conn->params,
2397 fsp->is_directory, pfile_owner_sid, pfile_grp_sid, pst, True)) {
2398 free_canon_ace_list(file_ace);
2399 free_canon_ace_list(dir_ace);
2400 return False;
2401 }
2402
2403 print_canon_ace_list( "dir ace - before valid", dir_ace);
2404
2405 if (dir_ace && !ensure_canon_entry_valid(fsp->conn, &dir_ace, fsp->conn->params,
2406 fsp->is_directory, pfile_owner_sid, pfile_grp_sid, pst, True)) {
2407 free_canon_ace_list(file_ace);
2408 free_canon_ace_list(dir_ace);
2409 return False;
2410 }
2411
2412 print_canon_ace_list( "file ace - return", file_ace);
2413 print_canon_ace_list( "dir ace - return", dir_ace);
2414
2415 *ppfile_ace = file_ace;
2416 *ppdir_ace = dir_ace;
2417 return True;
2418
2419 }
2420
2421 /******************************************************************************
2422 When returning permissions, try and fit NT display
2423 semantics if possible. Note the the canon_entries here must have been malloced.
2424 The list format should be - first entry = owner, followed by group and other user
2425 entries, last entry = other.
2426
2427 Note that this doesn't exactly match the NT semantics for an ACL. As POSIX entries
2428 are not ordered, and match on the most specific entry rather than walking a list,
2429 then a simple POSIX permission of rw-r--r-- should really map to 5 entries,
2430
2431 Entry 0: owner : deny all except read and write.
2432 Entry 1: owner : allow read and write.
2433 Entry 2: group : deny all except read.
2434 Entry 3: group : allow read.
2435 Entry 4: Everyone : allow read.
2436
2437 But NT cannot display this in their ACL editor !
2438 ********************************************************************************/
2439
2440 static void arrange_posix_perms(const char *filename, canon_ace **pp_list_head)
2441 {
2442 canon_ace *l_head = *pp_list_head;
2443 canon_ace *owner_ace = NULL;
2444 canon_ace *other_ace = NULL;
2445 canon_ace *ace = NULL;
2446
2447 for (ace = l_head; ace; ace = ace->next) {
2448 if (ace->type == SMB_ACL_USER_OBJ)
2449 owner_ace = ace;
2450 else if (ace->type == SMB_ACL_OTHER) {
2451 /* Last ace - this is "other" */
2452 other_ace = ace;
2453 }
2454 }
2455
2456 if (!owner_ace || !other_ace) {
2457 DEBUG(0,("arrange_posix_perms: Invalid POSIX permissions for file %s, missing owner or other.\n",
2458 filename ));
2459 return;
2460 }
2461
2462 /*
2463 * The POSIX algorithm applies to owner first, and other last,
2464 * so ensure they are arranged in this order.
2465 */
2466
2467 if (owner_ace) {
2468 DLIST_PROMOTE(l_head, owner_ace);
2469 }
2470
2471 if (other_ace) {
2472 DLIST_DEMOTE(l_head, other_ace, canon_ace *);
2473 }
2474
2475 /* We have probably changed the head of the list. */
2476
2477 *pp_list_head = l_head;
2478 }
2479
2480 /****************************************************************************
2481 Create a linked list of canonical ACE entries.
2482 ****************************************************************************/
2483
2484 static canon_ace *canonicalise_acl(struct connection_struct *conn,
2485 const char *fname, SMB_ACL_T posix_acl,
2486 const SMB_STRUCT_STAT *psbuf,
2487 const struct dom_sid *powner, const struct dom_sid *pgroup, struct pai_val *pal, SMB_ACL_TYPE_T the_acl_type)
2488 {
2489 mode_t acl_mask = (S_IRUSR|S_IWUSR|S_IXUSR);
2490 canon_ace *l_head = NULL;
2491 canon_ace *ace = NULL;
2492 canon_ace *next_ace = NULL;
2493 int entry_id = SMB_ACL_FIRST_ENTRY;
2494 SMB_ACL_ENTRY_T entry;
2495 size_t ace_count;
2496
2497 while ( posix_acl && (SMB_VFS_SYS_ACL_GET_ENTRY(conn, posix_acl, entry_id, &entry) == 1)) {
2498 SMB_ACL_TAG_T tagtype;
2499 SMB_ACL_PERMSET_T permset;
2500 struct dom_sid sid;
2501 posix_id unix_ug;
2502 enum ace_owner owner_type;
2503
2504 entry_id = SMB_ACL_NEXT_ENTRY;
2505
2506 /* Is this a MASK entry ? */
2507 if (SMB_VFS_SYS_ACL_GET_TAG_TYPE(conn, entry, &tagtype) == -1)
2508 continue;
2509
2510 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, entry, &permset) == -1)
2511 continue;
2512
2513 /* Decide which SID to use based on the ACL type. */
2514 switch(tagtype) {
2515 case SMB_ACL_USER_OBJ:
2516 /* Get the SID from the owner. */
2517 sid_copy(&sid, powner);
2518 unix_ug.uid = psbuf->st_ex_uid;
2519 owner_type = UID_ACE;
2520 break;
2521 case SMB_ACL_USER:
2522 {
2523 uid_t *puid = (uid_t *)SMB_VFS_SYS_ACL_GET_QUALIFIER(conn, entry);
2524 if (puid == NULL) {
2525 DEBUG(0,("canonicalise_acl: Failed to get uid.\n"));
2526 continue;
2527 }
2528 uid_to_sid( &sid, *puid);
2529 unix_ug.uid = *puid;
2530 owner_type = UID_ACE;
2531 SMB_VFS_SYS_ACL_FREE_QUALIFIER(conn, (void *)puid,tagtype);
2532 break;
2533 }
2534 case SMB_ACL_GROUP_OBJ:
2535 /* Get the SID from the owning group. */
2536 sid_copy(&sid, pgroup);
2537 unix_ug.gid = psbuf->st_ex_gid;
2538 owner_type = GID_ACE;
2539 break;
2540 case SMB_ACL_GROUP:
2541 {
2542 gid_t *pgid = (gid_t *)SMB_VFS_SYS_ACL_GET_QUALIFIER(conn, entry);
2543 if (pgid == NULL) {
2544 DEBUG(0,("canonicalise_acl: Failed to get gid.\n"));
2545 continue;
2546 }
2547 gid_to_sid( &sid, *pgid);
2548 unix_ug.gid = *pgid;
2549 owner_type = GID_ACE;
2550 SMB_VFS_SYS_ACL_FREE_QUALIFIER(conn, (void *)pgid,tagtype);
2551 break;
2552 }
2553 case SMB_ACL_MASK:
2554 acl_mask = convert_permset_to_mode_t(conn, permset);
2555 continue; /* Don't count the mask as an entry. */
2556 case SMB_ACL_OTHER:
2557 /* Use the Everyone SID */
2558 sid = global_sid_World;
2559 unix_ug.world = -1;
2560 owner_type = WORLD_ACE;
2561 break;
2562 default:
2563 DEBUG(0,("canonicalise_acl: Unknown tagtype %u\n", (unsigned int)tagtype));
2564 continue;
2565 }
2566
2567 /*
2568 * Add this entry to the list.
2569 */
2570
2571 if ((ace = talloc(talloc_tos(), canon_ace)) == NULL)
2572 goto fail;
2573
2574 ZERO_STRUCTP(ace);
2575 ace->type = tagtype;
2576 ace->perms = convert_permset_to_mode_t(conn, permset);
2577 ace->attr = ALLOW_ACE;
2578 ace->trustee = sid;
2579 ace->unix_ug = unix_ug;
2580 ace->owner_type = owner_type;
2581 ace->ace_flags = get_pai_flags(pal, ace, (the_acl_type == SMB_ACL_TYPE_DEFAULT));
2582
2583 DLIST_ADD(l_head, ace);
2584 }
2585
2586 /*
2587 * This next call will ensure we have at least a user/group/world set.
2588 */
2589
2590 if (!ensure_canon_entry_valid(conn, &l_head, conn->params,
2591 S_ISDIR(psbuf->st_ex_mode), powner, pgroup,
2592 psbuf, False))
2593 goto fail;
2594
2595 /*
2596 * Now go through the list, masking the permissions with the
2597 * acl_mask. Ensure all DENY Entries are at the start of the list.
2598 */
2599
2600 DEBUG(10,("canonicalise_acl: %s ace entries before arrange :\n", the_acl_type == SMB_ACL_TYPE_ACCESS ? "Access" : "Default" ));
2601
2602 for ( ace_count = 0, ace = l_head; ace; ace = next_ace, ace_count++) {
2603 next_ace = ace->next;
2604
2605 /* Masks are only applied to entries other than USER_OBJ and OTHER. */
2606 if (ace->type != SMB_ACL_OTHER && ace->type != SMB_ACL_USER_OBJ)
2607 ace->perms &= acl_mask;
2608
2609 if (ace->perms == 0) {
2610 DLIST_PROMOTE(l_head, ace);
2611 }
2612
2613 if( DEBUGLVL( 10 ) ) {
2614 print_canon_ace(ace, ace_count);
2615 }
2616 }
2617
2618 arrange_posix_perms(fname,&l_head );
2619
2620 print_canon_ace_list( "canonicalise_acl: ace entries after arrange", l_head );
2621
2622 return l_head;
2623
2624 fail:
2625
2626 free_canon_ace_list(l_head);
2627 return NULL;
2628 }
2629
2630 /****************************************************************************
2631 Check if the current user group list contains a given group.
2632 ****************************************************************************/
2633
2634 bool current_user_in_group(connection_struct *conn, gid_t gid)
2635 {
2636 int i;
2637 const struct security_unix_token *utok = get_current_utok(conn);
2638
2639 for (i = 0; i < utok->ngroups; i++) {
2640 if (utok->groups[i] == gid) {
2641 return True;
2642 }
2643 }
2644
2645 return False;
2646 }
2647
2648 /****************************************************************************
2649 Should we override a deny ? Check 'acl group control' and 'dos filemode'.
2650 ****************************************************************************/
2651
2652 static bool acl_group_override(connection_struct *conn,
2653 const struct smb_filename *smb_fname)
2654 {
2655 if ((errno != EPERM) && (errno != EACCES)) {
2656 return false;
2657 }
2658
2659 /* file primary group == user primary or supplementary group */
2660 if (lp_acl_group_control(SNUM(conn)) &&
2661 current_user_in_group(conn, smb_fname->st.st_ex_gid)) {
2662 return true;
2663 }
2664
2665 /* user has writeable permission */
2666 if (lp_dos_filemode(SNUM(conn)) &&
2667 can_write_to_file(conn, smb_fname)) {
2668 return true;
2669 }
2670
2671 return false;
2672 }
2673
2674 /****************************************************************************
2675 Attempt to apply an ACL to a file or directory.
2676 ****************************************************************************/
2677
2678 static bool set_canon_ace_list(files_struct *fsp,
2679 canon_ace *the_ace,
2680 bool default_ace,
2681 const SMB_STRUCT_STAT *psbuf,
2682 bool *pacl_set_support)
2683 {
2684 connection_struct *conn = fsp->conn;
2685 bool ret = False;
2686 SMB_ACL_T the_acl = SMB_VFS_SYS_ACL_INIT(conn, (int)count_canon_ace_list(the_ace) + 1);
2687 canon_ace *p_ace;
2688 int i;
2689 SMB_ACL_ENTRY_T mask_entry;
2690 bool got_mask_entry = False;
2691 SMB_ACL_PERMSET_T mask_permset;
2692 SMB_ACL_TYPE_T the_acl_type = (default_ace ? SMB_ACL_TYPE_DEFAULT : SMB_ACL_TYPE_ACCESS);
2693 bool needs_mask = False;
2694 mode_t mask_perms = 0;
2695
2696 /* Use the psbuf that was passed in. */
2697 if (psbuf != &fsp->fsp_name->st) {
2698 fsp->fsp_name->st = *psbuf;
2699 }
2700
2701 #if defined(POSIX_ACL_NEEDS_MASK)
2702 /* HP-UX always wants to have a mask (called "class" there). */
2703 needs_mask = True;
2704 #endif
2705
2706 if (the_acl == NULL) {
2707
2708 if (!no_acl_syscall_error(errno)) {
2709 /*
2710 * Only print this error message if we have some kind of ACL
2711 * support that's not working. Otherwise we would always get this.
2712 */
2713 DEBUG(0,("set_canon_ace_list: Unable to init %s ACL. (%s)\n",
2714 default_ace ? "default" : "file", strerror(errno) ));
2715 }
2716 *pacl_set_support = False;
2717 goto fail;
2718 }
2719
2720 if( DEBUGLVL( 10 )) {
2721 dbgtext("set_canon_ace_list: setting ACL:\n");
2722 for (i = 0, p_ace = the_ace; p_ace; p_ace = p_ace->next, i++ ) {
2723 print_canon_ace( p_ace, i);
2724 }
2725 }
2726
2727 for (i = 0, p_ace = the_ace; p_ace; p_ace = p_ace->next, i++ ) {
2728 SMB_ACL_ENTRY_T the_entry;
2729 SMB_ACL_PERMSET_T the_permset;
2730
2731 /*
2732 * ACLs only "need" an ACL_MASK entry if there are any named user or
2733 * named group entries. But if there is an ACL_MASK entry, it applies
2734 * to ACL_USER, ACL_GROUP, and ACL_GROUP_OBJ entries. Set the mask
2735 * so that it doesn't deny (i.e., mask off) any permissions.
2736 */
2737
2738 if (p_ace->type == SMB_ACL_USER || p_ace->type == SMB_ACL_GROUP) {
2739 needs_mask = True;
2740 mask_perms |= p_ace->perms;
2741 } else if (p_ace->type == SMB_ACL_GROUP_OBJ) {
2742 mask_perms |= p_ace->perms;
2743 }
2744
2745 /*
2746 * Get the entry for this ACE.
2747 */
2748
2749 if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &the_acl, &the_entry) == -1) {
2750 DEBUG(0,("set_canon_ace_list: Failed to create entry %d. (%s)\n",
2751 i, strerror(errno) ));
2752 goto fail;
2753 }
2754
2755 if (p_ace->type == SMB_ACL_MASK) {
2756 mask_entry = the_entry;
2757 got_mask_entry = True;
2758 }
2759
2760 /*
2761 * Ok - we now know the ACL calls should be working, don't
2762 * allow fallback to chmod.
2763 */
2764
2765 *pacl_set_support = True;
2766
2767 /*
2768 * Initialise the entry from the canon_ace.
2769 */
2770
2771 /*
2772 * First tell the entry what type of ACE this is.
2773 */
2774
2775 if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, the_entry, p_ace->type) == -1) {
2776 DEBUG(0,("set_canon_ace_list: Failed to set tag type on entry %d. (%s)\n",
2777 i, strerror(errno) ));
2778 goto fail;
2779 }
2780
2781 /*
2782 * Only set the qualifier (user or group id) if the entry is a user
2783 * or group id ACE.
2784 */
2785
2786 if ((p_ace->type == SMB_ACL_USER) || (p_ace->type == SMB_ACL_GROUP)) {
2787 if (SMB_VFS_SYS_ACL_SET_QUALIFIER(conn, the_entry,(void *)&p_ace->unix_ug.uid) == -1) {
2788 DEBUG(0,("set_canon_ace_list: Failed to set qualifier on entry %d. (%s)\n",
2789 i, strerror(errno) ));
2790 goto fail;
2791 }
2792 }
2793
2794 /*
2795 * Convert the mode_t perms in the canon_ace to a POSIX permset.
2796 */
2797
2798 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, the_entry, &the_permset) == -1) {
2799 DEBUG(0,("set_canon_ace_list: Failed to get permset on entry %d. (%s)\n",
2800 i, strerror(errno) ));
2801 goto fail;
2802 }
2803
2804 if (map_acl_perms_to_permset(conn, p_ace->perms, &the_permset) == -1) {
2805 DEBUG(0,("set_canon_ace_list: Failed to create permset for mode (%u) on entry %d. (%s)\n",
2806 (unsigned int)p_ace->perms, i, strerror(errno) ));
2807 goto fail;
2808 }
2809
2810 /*
2811 * ..and apply them to the entry.
2812 */
2813
2814 if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, the_entry, the_permset) == -1) {
2815 DEBUG(0,("set_canon_ace_list: Failed to add permset on entry %d. (%s)\n",
2816 i, strerror(errno) ));
2817 goto fail;
2818 }
2819
2820 if( DEBUGLVL( 10 ))
2821 print_canon_ace( p_ace, i);
2822
2823 }
2824
2825 if (needs_mask && !got_mask_entry) {
2826 if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &the_acl, &mask_entry) == -1) {
2827 DEBUG(0,("set_canon_ace_list: Failed to create mask entry. (%s)\n", strerror(errno) ));
2828 goto fail;
2829 }
2830
2831 if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, mask_entry, SMB_ACL_MASK) == -1) {
2832 DEBUG(0,("set_canon_ace_list: Failed to set tag type on mask entry. (%s)\n",strerror(errno) ));
2833 goto fail;
2834 }
2835
2836 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, mask_entry, &mask_permset) == -1) {
2837 DEBUG(0,("set_canon_ace_list: Failed to get mask permset. (%s)\n", strerror(errno) ));
2838 goto fail;
2839 }
2840
2841 if (map_acl_perms_to_permset(conn, S_IRUSR|S_IWUSR|S_IXUSR, &mask_permset) == -1) {
2842 DEBUG(0,("set_canon_ace_list: Failed to create mask permset. (%s)\n", strerror(errno) ));
2843 goto fail;
2844 }
2845
2846 if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, mask_entry, mask_permset) == -1) {
2847 DEBUG(0,("set_canon_ace_list: Failed to add mask permset. (%s)\n", strerror(errno) ));
2848 goto fail;
2849 }
2850 }
2851
2852 /*
2853 * Finally apply it to the file or directory.
2854 */
2855
2856 if(default_ace || fsp->is_directory || fsp->fh->fd == -1) {
2857 if (SMB_VFS_SYS_ACL_SET_FILE(conn, fsp->fsp_name->base_name,
2858 the_acl_type, the_acl) == -1) {
2859 /*
2860 * Some systems allow all the above calls and only fail with no ACL support
2861 * when attempting to apply the acl. HPUX with HFS is an example of this. JRA.
2862 */
2863 if (no_acl_syscall_error(errno)) {
2864 *pacl_set_support = False;
2865 }
2866
2867 if (acl_group_override(conn, fsp->fsp_name)) {
2868 int sret;
2869
2870 DEBUG(5,("set_canon_ace_list: acl group "
2871 "control on and current user in file "
2872 "%s primary group.\n",
2873 fsp_str_dbg(fsp)));
2874
2875 become_root();
2876 sret = SMB_VFS_SYS_ACL_SET_FILE(conn,
2877 fsp->fsp_name->base_name, the_acl_type,
2878 the_acl);
2879 unbecome_root();
2880 if (sret == 0) {
2881 ret = True;
2882 }
2883 }
2884
2885 if (ret == False) {
2886 DEBUG(2,("set_canon_ace_list: "
2887 "sys_acl_set_file type %s failed for "
2888 "file %s (%s).\n",
2889 the_acl_type == SMB_ACL_TYPE_DEFAULT ?
2890 "directory default" : "file",
2891 fsp_str_dbg(fsp), strerror(errno)));
2892 goto fail;
2893 }
2894 }
2895 } else {
2896 if (SMB_VFS_SYS_ACL_SET_FD(fsp, the_acl) == -1) {
2897 /*
2898 * Some systems allow all the above calls and only fail with no ACL support
2899 * when attempting to apply the acl. HPUX with HFS is an example of this. JRA.
2900 */
2901 if (no_acl_syscall_error(errno)) {
2902 *pacl_set_support = False;
2903 }
2904
2905 if (acl_group_override(conn, fsp->fsp_name)) {
2906 int sret;
2907
2908 DEBUG(5,("set_canon_ace_list: acl group "
2909 "control on and current user in file "
2910 "%s primary group.\n",
2911 fsp_str_dbg(fsp)));
2912
2913 become_root();
2914 sret = SMB_VFS_SYS_ACL_SET_FD(fsp, the_acl);
2915 unbecome_root();
2916 if (sret == 0) {
2917 ret = True;
2918 }
2919 }
2920
2921 if (ret == False) {
2922 DEBUG(2,("set_canon_ace_list: "
2923 "sys_acl_set_file failed for file %s "
2924 "(%s).\n",
2925 fsp_str_dbg(fsp), strerror(errno)));
2926 goto fail;
2927 }
2928 }
2929 }
2930
2931 ret = True;
2932
2933 fail:
2934
2935 if (the_acl != NULL) {
2936 SMB_VFS_SYS_ACL_FREE_ACL(conn, the_acl);
2937 }
2938
2939 return ret;
2940 }
2941
2942 /****************************************************************************
2943 Find a particular canon_ace entry.
2944 ****************************************************************************/
2945
2946 static struct canon_ace *canon_ace_entry_for(struct canon_ace *list, SMB_ACL_TAG_T type, posix_id *id)
2947 {
2948 while (list) {
2949 if (list->type == type && ((type != SMB_ACL_USER && type != SMB_ACL_GROUP) ||
2950 (type == SMB_ACL_USER && id && id->uid == list->unix_ug.uid) ||
2951 (type == SMB_ACL_GROUP && id && id->gid == list->unix_ug.gid)))
2952 break;
2953 list = list->next;
2954 }
2955 return list;
2956 }
2957
2958 /****************************************************************************
2959
2960 ****************************************************************************/
2961
2962 SMB_ACL_T free_empty_sys_acl(connection_struct *conn, SMB_ACL_T the_acl)
2963 {
2964 SMB_ACL_ENTRY_T entry;
2965
2966 if (!the_acl)
2967 return NULL;
2968 if (SMB_VFS_SYS_ACL_GET_ENTRY(conn, the_acl, SMB_ACL_FIRST_ENTRY, &entry) != 1) {
2969 SMB_VFS_SYS_ACL_FREE_ACL(conn, the_acl);
2970 return NULL;
2971 }
2972 return the_acl;
2973 }
2974
2975 /****************************************************************************
2976 Convert a canon_ace to a generic 3 element permission - if possible.
2977 ****************************************************************************/
2978
2979 #define MAP_PERM(p,mask,result) (((p) & (mask)) ? (result) : 0 )
2980
2981 static bool convert_canon_ace_to_posix_perms( files_struct *fsp, canon_ace *file_ace_list, mode_t *posix_perms)
2982 {
2983 int snum = SNUM(fsp->conn);
2984 size_t ace_count = count_canon_ace_list(file_ace_list);
2985 canon_ace *ace_p;
2986 canon_ace *owner_ace = NULL;
2987 canon_ace *group_ace = NULL;
2988 canon_ace *other_ace = NULL;
2989 mode_t and_bits;
2990 mode_t or_bits;
2991
2992 if (ace_count != 3) {
2993 DEBUG(3,("convert_canon_ace_to_posix_perms: Too many ACE "
2994 "entries for file %s to convert to posix perms.\n",
2995 fsp_str_dbg(fsp)));
2996 return False;
2997 }
2998
2999 for (ace_p = file_ace_list; ace_p; ace_p = ace_p->next) {
3000 if (ace_p->owner_type == UID_ACE)
3001 owner_ace = ace_p;
3002 else if (ace_p->owner_type == GID_ACE)
3003 group_ace = ace_p;
3004 else if (ace_p->owner_type == WORLD_ACE)
3005 other_ace = ace_p;
3006 }
3007
3008 if (!owner_ace || !group_ace || !other_ace) {
3009 DEBUG(3,("convert_canon_ace_to_posix_perms: Can't get "
3010 "standard entries for file %s.\n", fsp_str_dbg(fsp)));
3011 return False;
3012 }
3013
3014 *posix_perms = (mode_t)0;
3015
3016 *posix_perms |= owner_ace->perms;
3017 *posix_perms |= MAP_PERM(group_ace->perms, S_IRUSR, S_IRGRP);
3018 *posix_perms |= MAP_PERM(group_ace->perms, S_IWUSR, S_IWGRP);
3019 *posix_perms |= MAP_PERM(group_ace->perms, S_IXUSR, S_IXGRP);
3020 *posix_perms |= MAP_PERM(other_ace->perms, S_IRUSR, S_IROTH);
3021 *posix_perms |= MAP_PERM(other_ace->perms, S_IWUSR, S_IWOTH);
3022 *posix_perms |= MAP_PERM(other_ace->perms, S_IXUSR, S_IXOTH);
3023
3024 /* The owner must have at least read access. */
3025
3026 *posix_perms |= S_IRUSR;
3027 if (fsp->is_directory)
3028 *posix_perms |= (S_IWUSR|S_IXUSR);
3029
3030 /* If requested apply the masks. */
3031
3032 /* Get the initial bits to apply. */
3033
3034 if (fsp->is_directory) {
3035 and_bits = lp_dir_security_mask(snum);
3036 or_bits = lp_force_dir_security_mode(snum);
3037 } else {
3038 and_bits = lp_security_mask(snum);
3039 or_bits = lp_force_security_mode(snum);
3040 }
3041
3042 *posix_perms = (((*posix_perms) & and_bits)|or_bits);
3043
3044 DEBUG(10,("convert_canon_ace_to_posix_perms: converted u=%o,g=%o,w=%o "
3045 "to perm=0%o for file %s.\n", (int)owner_ace->perms,
3046 (int)group_ace->perms, (int)other_ace->perms,
3047 (int)*posix_perms, fsp_str_dbg(fsp)));
3048
3049 return True;
3050 }
3051
3052 /****************************************************************************
3053 Incoming NT ACLs on a directory can be split into a default POSIX acl (CI|OI|IO) and
3054 a normal POSIX acl. Win2k needs these split acls re-merging into one ACL
3055 with CI|OI set so it is inherited and also applies to the directory.
3056 Based on code from "Jim McDonough" <jmcd@us.ibm.com>.
3057 ****************************************************************************/
3058
3059 static size_t merge_default_aces( struct security_ace *nt_ace_list, size_t num_aces)
3060 {
3061 size_t i, j;
3062
3063 for (i = 0; i < num_aces; i++) {
3064 for (j = i+1; j < num_aces; j++) {
3065 uint32 i_flags_ni = (nt_ace_list[i].flags & ~SEC_ACE_FLAG_INHERITED_ACE);
3066 uint32 j_flags_ni = (nt_ace_list[j].flags & ~SEC_ACE_FLAG_INHERITED_ACE);
3067 bool i_inh = (nt_ace_list[i].flags & SEC_ACE_FLAG_INHERITED_ACE) ? True : False;
3068 bool j_inh = (nt_ace_list[j].flags & SEC_ACE_FLAG_INHERITED_ACE) ? True : False;
3069
3070 /* We know the lower number ACE's are file entries. */
3071 if ((nt_ace_list[i].type == nt_ace_list[j].type) &&
3072 (nt_ace_list[i].size == nt_ace_list[j].size) &&
3073 (nt_ace_list[i].access_mask == nt_ace_list[j].access_mask) &&
3074 dom_sid_equal(&nt_ace_list[i].trustee, &nt_ace_list[j].trustee) &&
3075 (i_inh == j_inh) &&
3076 (i_flags_ni == 0) &&
3077 (j_flags_ni == (SEC_ACE_FLAG_OBJECT_INHERIT|
3078 SEC_ACE_FLAG_CONTAINER_INHERIT|
3079 SEC_ACE_FLAG_INHERIT_ONLY))) {
3080 /*
3081 * W2K wants to have access allowed zero access ACE's
3082 * at the end of the list. If the mask is zero, merge
3083 * the non-inherited ACE onto the inherited ACE.
3084 */
3085
3086 if (nt_ace_list[i].access_mask == 0) {
3087 nt_ace_list[j].flags = SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT|
3088 (i_inh ? SEC_ACE_FLAG_INHERITED_ACE : 0);
3089 if (num_aces - i - 1 > 0)
3090 memmove(&nt_ace_list[i], &nt_ace_list[i+1], (num_aces-i-1) *
3091 sizeof(struct security_ace));
3092
3093 DEBUG(10,("merge_default_aces: Merging zero access ACE %u onto ACE %u.\n",
3094 (unsigned int)i, (unsigned int)j ));
3095 } else {
3096 /*
3097 * These are identical except for the flags.
3098 * Merge the inherited ACE onto the non-inherited ACE.
3099 */
3100
3101 nt_ace_list[i].flags = SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT|
3102 (i_inh ? SEC_ACE_FLAG_INHERITED_ACE : 0);
3103 if (num_aces - j - 1 > 0)
3104 memmove(&nt_ace_list[j], &nt_ace_list[j+1], (num_aces-j-1) *
3105 sizeof(struct security_ace));
3106
3107 DEBUG(10,("merge_default_aces: Merging ACE %u onto ACE %u.\n",
3108 (unsigned int)j, (unsigned int)i ));
3109 }
3110 num_aces--;
3111 break;
3112 }
3113 }
3114 }
3115
3116 return num_aces;
3117 }
3118
3119 /*
3120 * Add or Replace ACE entry.
3121 * In some cases we need to add a specific ACE for compatibility reasons.
3122 * When doing that we must make sure we are not actually creating a duplicate
3123 * entry. So we need to search whether an ACE entry already exist and eventually
3124 * replacce the access mask, or add a completely new entry if none was found.
3125 *
3126 * This function assumes the array has enough space to add a new entry without
3127 * any reallocation of memory.
3128 */
3129
3130 static void add_or_replace_ace(struct security_ace *nt_ace_list, size_t *num_aces,
3131 const struct dom_sid *sid, enum security_ace_type type,
3132 uint32_t mask, uint8_t flags)
3133 {
3134 int i;
3135
3136 /* first search for a duplicate */
3137 for (i = 0; i < *num_aces; i++) {
3138 if (dom_sid_equal(&nt_ace_list[i].trustee, sid) &&
3139 (nt_ace_list[i].flags == flags)) break;
3140 }
3141
3142 if (i < *num_aces) { /* found */
3143 nt_ace_list[i].type = type;
3144 nt_ace_list[i].access_mask = mask;
3145 DEBUG(10, ("Replacing ACE %d with SID %s and flags %02x\n",
3146 i, sid_string_dbg(sid), flags));
3147 return;
3148 }
3149
3150 /* not found, append it */
3151 init_sec_ace(&nt_ace_list[(*num_aces)++], sid, type, mask, flags);
3152 }
3153
3154
3155 /****************************************************************************
3156 Reply to query a security descriptor from an fsp. If it succeeds it allocates
3157 the space for the return elements and returns the size needed to return the
3158 security descriptor. This should be the only external function needed for
3159 the UNIX style get ACL.
3160 ****************************************************************************/
3161
3162 static NTSTATUS posix_get_nt_acl_common(struct connection_struct *conn,
3163 const char *name,
3164 const SMB_STRUCT_STAT *sbuf,
3165 struct pai_val *pal,
3166 SMB_ACL_T posix_acl,
3167 SMB_ACL_T def_acl,
3168 uint32_t security_info,
3169 struct security_descriptor **ppdesc)
3170 {
3171 struct dom_sid owner_sid;
3172 struct dom_sid group_sid;
3173 size_t sd_size = 0;
3174 struct security_acl *psa = NULL;
3175 size_t num_acls = 0;
3176 size_t num_def_acls = 0;
3177 size_t num_aces = 0;
3178 canon_ace *file_ace = NULL;
3179 canon_ace *dir_ace = NULL;
3180 struct security_ace *nt_ace_list = NULL;
3181 size_t num_profile_acls = 0;
3182 struct dom_sid orig_owner_sid;
3183 struct security_descriptor *psd = NULL;
3184 int i;
3185
3186 /*
3187 * Get the owner, group and world SIDs.
3188 */
3189
3190 create_file_sids(sbuf, &owner_sid, &group_sid);
3191
3192 if (lp_profile_acls(SNUM(conn))) {
3193 /* For WXP SP1 the owner must be administrators. */
3194 sid_copy(&orig_owner_sid, &owner_sid);
3195 sid_copy(&owner_sid, &global_sid_Builtin_Administrators);
3196 sid_copy(&group_sid, &global_sid_Builtin_Users);
3197 num_profile_acls = 3;
3198 }
3199
3200 if ((security_info & SECINFO_DACL) && !(security_info & SECINFO_PROTECTED_DACL)) {
3201
3202 /*
3203 * In the optimum case Creator Owner and Creator Group would be used for
3204 * the ACL_USER_OBJ and ACL_GROUP_OBJ entries, respectively, but this
3205 * would lead to usability problems under Windows: The Creator entries
3206 * are only available in browse lists of directories and not for files;
3207 * additionally the identity of the owning group couldn't be determined.
3208 * We therefore use those identities only for Default ACLs.
3209 */
3210
3211 /* Create the canon_ace lists. */
3212 file_ace = canonicalise_acl(conn, name, posix_acl, sbuf,
3213 &owner_sid, &group_sid, pal,
3214 SMB_ACL_TYPE_ACCESS);
3215
3216 /* We must have *some* ACLS. */
3217
3218 if (count_canon_ace_list(file_ace) == 0) {
3219 DEBUG(0,("get_nt_acl : No ACLs on file (%s) !\n", name));
3220 goto done;
3221 }
3222
3223 if (S_ISDIR(sbuf->st_ex_mode) && def_acl) {
3224 dir_ace = canonicalise_acl(conn, name, def_acl,
3225 sbuf,
3226 &global_sid_Creator_Owner,
3227 &global_sid_Creator_Group,
3228 pal, SMB_ACL_TYPE_DEFAULT);
3229 }
3230
3231 /*
3232 * Create the NT ACE list from the canonical ace lists.
3233 */
3234
3235 {
3236 canon_ace *ace;
3237 enum security_ace_type nt_acl_type;
3238
3239 if (nt4_compatible_acls() && dir_ace) {
3240 /*
3241 * NT 4 chokes if an ACL contains an INHERIT_ONLY entry
3242 * but no non-INHERIT_ONLY entry for one SID. So we only
3243 * remove entries from the Access ACL if the
3244 * corresponding Default ACL entries have also been
3245 * removed. ACEs for CREATOR-OWNER and CREATOR-GROUP
3246 * are exceptions. We can do nothing
3247 * intelligent if the Default ACL contains entries that
3248 * are not also contained in the Access ACL, so this
3249 * case will still fail under NT 4.
3250 */
3251
3252 ace = canon_ace_entry_for(dir_ace, SMB_ACL_OTHER, NULL);
3253 if (ace && !ace->perms) {
3254 DLIST_REMOVE(dir_ace, ace);
3255 TALLOC_FREE(ace);
3256
3257 ace = canon_ace_entry_for(file_ace, SMB_ACL_OTHER, NULL);
3258 if (ace && !ace->perms) {
3259 DLIST_REMOVE(file_ace, ace);
3260 TALLOC_FREE(ace);
3261 }
3262 }
3263
3264 /*
3265 * WinNT doesn't usually have Creator Group
3266 * in browse lists, so we send this entry to
3267 * WinNT even if it contains no relevant
3268 * permissions. Once we can add
3269 * Creator Group to browse lists we can
3270 * re-enable this.
3271 */
3272
3273 #if 0
3274 ace = canon_ace_entry_for(dir_ace, SMB_ACL_GROUP_OBJ, NULL);
3275 if (ace && !ace->perms) {
3276 DLIST_REMOVE(dir_ace, ace);
3277 TALLOC_FREE(ace);
3278 }
3279 #endif
3280
3281 ace = canon_ace_entry_for(file_ace, SMB_ACL_GROUP_OBJ, NULL);
3282 if (ace && !ace->perms) {
3283 DLIST_REMOVE(file_ace, ace);
3284 TALLOC_FREE(ace);
3285 }
3286 }
3287
3288 num_acls = count_canon_ace_list(file_ace);
3289 num_def_acls = count_canon_ace_list(dir_ace);
3290
3291 /* Allocate the ace list. */
3292 if ((nt_ace_list = talloc_array(talloc_tos(), struct security_ace,num_acls + num_profile_acls + num_def_acls)) == NULL) {
3293 DEBUG(0,("get_nt_acl: Unable to malloc space for nt_ace_list.\n"));
3294 goto done;
3295 }
3296
3297 memset(nt_ace_list, '\0', (num_acls + num_def_acls) * sizeof(struct security_ace) );
3298
3299 /*
3300 * Create the NT ACE list from the canonical ace lists.
3301 */
3302
3303 for (ace = file_ace; ace != NULL; ace = ace->next) {
3304 uint32_t acc = map_canon_ace_perms(SNUM(conn),
3305 &nt_acl_type,
3306 ace->perms,
3307 S_ISDIR(sbuf->st_ex_mode));
3308 init_sec_ace(&nt_ace_list[num_aces++],
3309 &ace->trustee,
3310 nt_acl_type,
3311 acc,
3312 ace->ace_flags);
3313 }
3314
3315 /* The User must have access to a profile share - even
3316 * if we can't map the SID. */
3317 if (lp_profile_acls(SNUM(conn))) {
3318 add_or_replace_ace(nt_ace_list, &num_aces,
3319 &global_sid_Builtin_Users,
3320 SEC_ACE_TYPE_ACCESS_ALLOWED,
3321 FILE_GENERIC_ALL, 0);
3322 }
3323
3324 for (ace = dir_ace; ace != NULL; ace = ace->next) {
3325 uint32_t acc = map_canon_ace_perms(SNUM(conn),
3326 &nt_acl_type,
3327 ace->perms,
3328 S_ISDIR(sbuf->st_ex_mode));
3329 init_sec_ace(&nt_ace_list[num_aces++],
3330 &ace->trustee,
3331 nt_acl_type,
3332 acc,
3333 ace->ace_flags |
3334 SEC_ACE_FLAG_OBJECT_INHERIT|
3335 SEC_ACE_FLAG_CONTAINER_INHERIT|
3336 SEC_ACE_FLAG_INHERIT_ONLY);
3337 }
3338
3339 /* The User must have access to a profile share - even
3340 * if we can't map the SID. */
3341 if (lp_profile_acls(SNUM(conn))) {
3342 add_or_replace_ace(nt_ace_list, &num_aces,
3343 &global_sid_Builtin_Users,
3344 SEC_ACE_TYPE_ACCESS_ALLOWED,
3345 FILE_GENERIC_ALL,
3346 SEC_ACE_FLAG_OBJECT_INHERIT |
3347 SEC_ACE_FLAG_CONTAINER_INHERIT |
3348 SEC_ACE_FLAG_INHERIT_ONLY);
3349 }
3350
3351 /*
3352 * Merge POSIX default ACLs and normal ACLs into one NT ACE.
3353 * Win2K needs this to get the inheritance correct when replacing ACLs
3354 * on a directory tree. Based on work by Jim @ IBM.
3355 */
3356
3357 num_aces = merge_default_aces(nt_ace_list, num_aces);
3358
3359 if (lp_profile_acls(SNUM(conn))) {
3360 for (i = 0; i < num_aces; i++) {
3361 if (dom_sid_equal(&nt_ace_list[i].trustee, &owner_sid)) {
3362 add_or_replace_ace(nt_ace_list, &num_aces,
3363 &orig_owner_sid,
3364 nt_ace_list[i].type,
3365 nt_ace_list[i].access_mask,
3366 nt_ace_list[i].flags);
3367 break;
3368 }
3369 }
3370 }
3371 }
3372
3373 if (num_aces) {
3374 if((psa = make_sec_acl( talloc_tos(), NT4_ACL_REVISION, num_aces, nt_ace_list)) == NULL) {
3375 DEBUG(0,("get_nt_acl: Unable to malloc space for acl.\n"));
3376 goto done;
3377 }
3378 }
3379 } /* security_info & SECINFO_DACL */
3380
3381 psd = make_standard_sec_desc( talloc_tos(),
3382 (security_info & SECINFO_OWNER) ? &owner_sid : NULL,
3383 (security_info & SECINFO_GROUP) ? &group_sid : NULL,
3384 psa,
3385 &sd_size);
3386
3387 if(!psd) {
3388 DEBUG(0,("get_nt_acl: Unable to malloc space for security descriptor.\n"));
3389 sd_size = 0;
3390 goto done;
3391 }
3392
3393 /*
3394 * Windows 2000: The DACL_PROTECTED flag in the security
3395 * descriptor marks the ACL as non-inheriting, i.e., no
3396 * ACEs from higher level directories propagate to this
3397 * ACL. In the POSIX ACL model permissions are only
3398 * inherited at file create time, so ACLs never contain
3399 * any ACEs that are inherited dynamically. The DACL_PROTECTED
3400 * flag doesn't seem to bother Windows NT.
3401 * Always set this if map acl inherit is turned off.
3402 */
3403 if (pal == NULL || !lp_map_acl_inherit(SNUM(conn))) {
3404 psd->type |= SEC_DESC_DACL_PROTECTED;
3405 } else {
3406 psd->type |= pal->sd_type;
3407 }
3408
3409 if (psd->dacl) {
3410 dacl_sort_into_canonical_order(psd->dacl->aces, (unsigned int)psd->dacl->num_aces);
3411 }
3412
3413 *ppdesc = psd;
3414
3415 done:
3416
3417 if (posix_acl) {
3418 SMB_VFS_SYS_ACL_FREE_ACL(conn, posix_acl);
3419 }
3420 if (def_acl) {
3421 SMB_VFS_SYS_ACL_FREE_ACL(conn, def_acl);
3422 }
3423 free_canon_ace_list(file_ace);
3424 free_canon_ace_list(dir_ace);
3425 free_inherited_info(pal);
3426 TALLOC_FREE(nt_ace_list);
3427
3428 return NT_STATUS_OK;
3429 }
3430
3431 NTSTATUS posix_fget_nt_acl(struct files_struct *fsp, uint32_t security_info,
3432 struct security_descriptor **ppdesc)
3433 {
3434 SMB_STRUCT_STAT sbuf;
3435 SMB_ACL_T posix_acl = NULL;
3436 struct pai_val *pal;
3437
3438 *ppdesc = NULL;
3439
3440 DEBUG(10,("posix_fget_nt_acl: called for file %s\n",
3441 fsp_str_dbg(fsp)));
3442
3443 /* can it happen that fsp_name == NULL ? */
3444 if (fsp->is_directory || fsp->fh->fd == -1) {
3445 return posix_get_nt_acl(fsp->conn, fsp->fsp_name->base_name,
3446 security_info, ppdesc);
3447 }
3448
3449 /* Get the stat struct for the owner info. */
3450 if(SMB_VFS_FSTAT(fsp, &sbuf) != 0) {
3451 return map_nt_error_from_unix(errno);
3452 }
3453
3454 /* Get the ACL from the fd. */
3455 posix_acl = SMB_VFS_SYS_ACL_GET_FD(fsp);
3456
3457 pal = fload_inherited_info(fsp);
3458
3459 return posix_get_nt_acl_common(fsp->conn, fsp->fsp_name->base_name,
3460 &sbuf, pal, posix_acl, NULL,
3461 security_info, ppdesc);
3462 }
3463
3464 NTSTATUS posix_get_nt_acl(struct connection_struct *conn, const char *name,
3465 uint32_t security_info, struct security_descriptor **ppdesc)
3466 {
3467 SMB_ACL_T posix_acl = NULL;
3468 SMB_ACL_T def_acl = NULL;
3469 struct pai_val *pal;
3470 struct smb_filename smb_fname;
3471 int ret;
3472
3473 *ppdesc = NULL;
3474
3475 DEBUG(10,("posix_get_nt_acl: called for file %s\n", name ));
3476
3477 ZERO_STRUCT(smb_fname);
3478 smb_fname.base_name = discard_const_p(char, name);
3479
3480 /* Get the stat struct for the owner info. */
3481 if (lp_posix_pathnames()) {
3482 ret = SMB_VFS_LSTAT(conn, &smb_fname);
3483 } else {
3484 ret = SMB_VFS_STAT(conn, &smb_fname);
3485 }
3486
3487 if (ret == -1) {
3488 return map_nt_error_from_unix(errno);
3489 }
3490
3491 /* Get the ACL from the path. */
3492 posix_acl = SMB_VFS_SYS_ACL_GET_FILE(conn, name, SMB_ACL_TYPE_ACCESS);
3493
3494 /* If it's a directory get the default POSIX ACL. */
3495 if(S_ISDIR(smb_fname.st.st_ex_mode)) {
3496 def_acl = SMB_VFS_SYS_ACL_GET_FILE(conn, name, SMB_ACL_TYPE_DEFAULT);
3497 def_acl = free_empty_sys_acl(conn, def_acl);
3498 }
3499
3500 pal = load_inherited_info(conn, name);
3501
3502 return posix_get_nt_acl_common(conn, name, &smb_fname.st, pal,
3503 posix_acl, def_acl, security_info,
3504 ppdesc);
3505 }
3506
3507 /****************************************************************************
3508 Try to chown a file. We will be able to chown it under the following conditions.
3509
3510 1) If we have root privileges, then it will just work.
3511 2) If we have SeRestorePrivilege we can change the user + group to any other user.
3512 3) If we have SeTakeOwnershipPrivilege we can change the user to the current user.
3513 4) If we have write permission to the file and dos_filemodes is set
3514 then allow chown to the currently authenticated user.
3515 ****************************************************************************/
3516
3517 NTSTATUS try_chown(files_struct *fsp, uid_t uid, gid_t gid)
3518 {
3519 NTSTATUS status;
3520
3521 if(!CAN_WRITE(fsp->conn)) {
3522 return NT_STATUS_MEDIA_WRITE_PROTECTED;
3523 }
3524
3525 /* Case (1). */
3526 status = vfs_chown_fsp(fsp, uid, gid);
3527 if (NT_STATUS_IS_OK(status)) {
3528 return status;
3529 }
3530
3531 /* Case (2) / (3) */
3532 if (lp_enable_privileges()) {
3533 bool has_take_ownership_priv = security_token_has_privilege(
3534 get_current_nttok(fsp->conn),
3535 SEC_PRIV_TAKE_OWNERSHIP);
3536 bool has_restore_priv = security_token_has_privilege(
3537 get_current_nttok(fsp->conn),
3538 SEC_PRIV_RESTORE);
3539
3540 if (has_restore_priv) {
3541 ; /* Case (2) */
3542 } else if (has_take_ownership_priv) {
3543 /* Case (3) */
3544 if (uid == get_current_uid(fsp->conn)) {
3545 gid = (gid_t)-1;
3546 } else {
3547 has_take_ownership_priv = false;
3548 }
3549 }
3550
3551 if (has_take_ownership_priv || has_restore_priv) {
3552 become_root();
3553 status = vfs_chown_fsp(fsp, uid, gid);
3554 unbecome_root();
3555 return status;
3556 }
3557 }
3558
3559 /* Case (4). */
3560 if (!lp_dos_filemode(SNUM(fsp->conn))) {
3561 return NT_STATUS_ACCESS_DENIED;
3562 }
3563
3564 /* only allow chown to the current user. This is more secure,
3565 and also copes with the case where the SID in a take ownership ACL is
3566 a local SID on the users workstation
3567 */
3568 if (uid != get_current_uid(fsp->conn)) {
3569 return NT_STATUS_ACCESS_DENIED;
3570 }
3571
3572 become_root();
3573 /* Keep the current file gid the same. */
3574 status = vfs_chown_fsp(fsp, uid, (gid_t)-1);
3575 unbecome_root();
3576
3577 return status;
3578 }
3579
3580 #if 0
3581 /* Disable this - prevents ACL inheritance from the ACL editor. JRA. */
3582
3583 /****************************************************************************
3584 Take care of parent ACL inheritance.
3585 ****************************************************************************/
3586
3587 NTSTATUS append_parent_acl(files_struct *fsp,
3588 const struct security_descriptor *pcsd,
3589 struct security_descriptor **pp_new_sd)
3590 {
3591 struct smb_filename *smb_dname = NULL;
3592 struct security_descriptor *parent_sd = NULL;
3593 files_struct *parent_fsp = NULL;
3594 TALLOC_CTX *mem_ctx = talloc_tos();
3595 char *parent_name = NULL;
3596 struct security_ace *new_ace = NULL;
3597 unsigned int num_aces = pcsd->dacl->num_aces;
3598 NTSTATUS status;
3599 int info;
3600 unsigned int i, j;
3601 struct security_descriptor *psd = dup_sec_desc(talloc_tos(), pcsd);
3602 bool is_dacl_protected = (pcsd->type & SEC_DESC_DACL_PROTECTED);
3603
3604 if (psd == NULL) {
3605 return NT_STATUS_NO_MEMORY;
3606 }
3607
3608 if (!parent_dirname(mem_ctx, fsp->fsp_name->base_name, &parent_name,
3609 NULL)) {
3610 return NT_STATUS_NO_MEMORY;
3611 }
3612
3613 status = create_synthetic_smb_fname(mem_ctx, parent_name, NULL, NULL,
3614 &smb_dname);
3615 if (!NT_STATUS_IS_OK(status)) {
3616 goto fail;
3617 }
3618
3619 status = SMB_VFS_CREATE_FILE(
3620 fsp->conn, /* conn */
3621 NULL, /* req */
3622 0, /* root_dir_fid */
3623 smb_dname, /* fname */
3624 FILE_READ_ATTRIBUTES, /* access_mask */
3625 FILE_SHARE_NONE, /* share_access */
3626 FILE_OPEN, /* create_disposition*/
3627 FILE_DIRECTORY_FILE, /* create_options */
3628 0, /* file_attributes */
3629 INTERNAL_OPEN_ONLY, /* oplock_request */
3630 0, /* allocation_size */
3631 NULL, /* sd */
3632 NULL, /* ea_list */
3633 &parent_fsp, /* result */
3634 &info); /* pinfo */
3635
3636 if (!NT_STATUS_IS_OK(status)) {
3637 TALLOC_FREE(smb_dname);
3638 return status;
3639 }
3640
3641 status = SMB_VFS_GET_NT_ACL(parent_fsp->conn, smb_dname->base_name,
3642 SECINFO_DACL, &parent_sd );
3643
3644 close_file(NULL, parent_fsp, NORMAL_CLOSE);
3645 TALLOC_FREE(smb_dname);
3646
3647 if (!NT_STATUS_IS_OK(status)) {
3648 return status;
3649 }
3650
3651 /*
3652 * Make room for potentially all the ACLs from
3653 * the parent. We used to add the ugw triple here,
3654 * as we knew we were dealing with POSIX ACLs.
3655 * We no longer need to do so as we can guarentee
3656 * that a default ACL from the parent directory will
3657 * be well formed for POSIX ACLs if it came from a
3658 * POSIX ACL source, and if we're not writing to a
3659 * POSIX ACL sink then we don't care if it's not well
3660 * formed. JRA.
3661 */
3662
3663 num_aces += parent_sd->dacl->num_aces;
3664
3665 if((new_ace = talloc_zero_array(mem_ctx, struct security_ace,
3666 num_aces)) == NULL) {
3667 return NT_STATUS_NO_MEMORY;
3668 }
3669
3670 /* Start by copying in all the given ACE entries. */
3671 for (i = 0; i < psd->dacl->num_aces; i++) {
3672 sec_ace_copy(&new_ace[i], &psd->dacl->aces[i]);
3673 }
3674
3675 /*
3676 * Note that we're ignoring "inherit permissions" here
3677 * as that really only applies to newly created files. JRA.
3678 */
3679
3680 /* Finally append any inherited ACEs. */
3681 for (j = 0; j < parent_sd->dacl->num_aces; j++) {
3682 struct security_ace *se = &parent_sd->dacl->aces[j];
3683
3684 if (fsp->is_directory) {
3685 if (!(se->flags & SEC_ACE_FLAG_CONTAINER_INHERIT)) {
3686 /* Doesn't apply to a directory - ignore. */
3687 DEBUG(10,("append_parent_acl: directory %s "
3688 "ignoring non container "
3689 "inherit flags %u on ACE with sid %s "
3690 "from parent %s\n",
3691 fsp_str_dbg(fsp),
3692 (unsigned int)se->flags,
3693 sid_string_dbg(&se->trustee),
3694 parent_name));
3695 continue;
3696 }
3697 } else {
3698 if (!(se->flags & SEC_ACE_FLAG_OBJECT_INHERIT)) {
3699 /* Doesn't apply to a file - ignore. */
3700 DEBUG(10,("append_parent_acl: file %s "
3701 "ignoring non object "
3702 "inherit flags %u on ACE with sid %s "
3703 "from parent %s\n",
3704 fsp_str_dbg(fsp),
3705 (unsigned int)se->flags,
3706 sid_string_dbg(&se->trustee),
3707 parent_name));
3708 continue;
3709 }
3710 }
3711
3712 if (is_dacl_protected) {
3713 /* If the DACL is protected it means we must
3714 * not overwrite an existing ACE entry with the
3715 * same SID. This is order N^2. Ouch :-(. JRA. */
3716 unsigned int k;
3717 for (k = 0; k < psd->dacl->num_aces; k++) {
3718 if (dom_sid_equal(&psd->dacl->aces[k].trustee,
3719 &se->trustee)) {
3720 break;
3721 }
3722 }
3723 if (k < psd->dacl->num_aces) {
3724 /* SID matched. Ignore. */
3725 DEBUG(10,("append_parent_acl: path %s "
3726 "ignoring ACE with protected sid %s "
3727 "from parent %s\n",
3728 fsp_str_dbg(fsp),
3729 sid_string_dbg(&se->trustee),
3730 parent_name));
3731 continue;
3732 }
3733 }
3734
3735 sec_ace_copy(&new_ace[i], se);
3736 if (se->flags & SEC_ACE_FLAG_NO_PROPAGATE_INHERIT) {
3737 new_ace[i].flags &= ~(SEC_ACE_FLAG_VALID_INHERIT);
3738 }
3739 new_ace[i].flags |= SEC_ACE_FLAG_INHERITED_ACE;
3740
3741 if (fsp->is_directory) {
3742 /*
3743 * Strip off any inherit only. It's applied.
3744 */
3745 new_ace[i].flags &= ~(SEC_ACE_FLAG_INHERIT_ONLY);
3746 if (se->flags & SEC_ACE_FLAG_NO_PROPAGATE_INHERIT) {
3747 /* No further inheritance. */
3748 new_ace[i].flags &=
3749 ~(SEC_ACE_FLAG_CONTAINER_INHERIT|
3750 SEC_ACE_FLAG_OBJECT_INHERIT);
3751 }
3752 } else {
3753 /*
3754 * Strip off any container or inherit
3755 * flags, they can't apply to objects.
3756 */
3757 new_ace[i].flags &= ~(SEC_ACE_FLAG_CONTAINER_INHERIT|
3758 SEC_ACE_FLAG_INHERIT_ONLY|
3759 SEC_ACE_FLAG_NO_PROPAGATE_INHERIT);
3760 }
3761 i++;
3762
3763 DEBUG(10,("append_parent_acl: path %s "
3764 "inheriting ACE with sid %s "
3765 "from parent %s\n",
3766 fsp_str_dbg(fsp),
3767 sid_string_dbg(&se->trustee),
3768 parent_name));
3769 }
3770
3771 psd->dacl->aces = new_ace;
3772 psd->dacl->num_aces = i;
3773 psd->type &= ~(SEC_DESC_DACL_AUTO_INHERITED|
3774 SEC_DESC_DACL_AUTO_INHERIT_REQ);
3775
3776 *pp_new_sd = psd;
3777 return status;
3778 }
3779 #endif
3780
3781 /****************************************************************************
3782 Reply to set a security descriptor on an fsp. security_info_sent is the
3783 description of the following NT ACL.
3784 This should be the only external function needed for the UNIX style set ACL.
3785 We make a copy of psd_orig as internal functions modify the elements inside
3786 it, even though it's a const pointer.
3787 ****************************************************************************/
3788
3789 NTSTATUS set_nt_acl(files_struct *fsp, uint32 security_info_sent, const struct security_descriptor *psd_orig)
3790 {
3791 connection_struct *conn = fsp->conn;
3792 uid_t user = (uid_t)-1;
3793 gid_t grp = (gid_t)-1;
3794 struct dom_sid file_owner_sid;
3795 struct dom_sid file_grp_sid;
3796 canon_ace *file_ace_list = NULL;
3797 canon_ace *dir_ace_list = NULL;
3798 bool acl_perms = False;
3799 mode_t orig_mode = (mode_t)0;
3800 NTSTATUS status;
3801 bool set_acl_as_root = false;
3802 bool acl_set_support = false;
3803 bool ret = false;
3804 struct security_descriptor *psd = NULL;
3805
3806 DEBUG(10,("set_nt_acl: called for file %s\n",
3807 fsp_str_dbg(fsp)));
3808
3809 if (!CAN_WRITE(conn)) {
3810 DEBUG(10,("set acl rejected on read-only share\n"));
3811 return NT_STATUS_MEDIA_WRITE_PROTECTED;
3812 }
3813
3814 if (!psd_orig) {
3815 return NT_STATUS_INVALID_PARAMETER;
3816 }
3817
3818 psd = dup_sec_desc(talloc_tos(), psd_orig);
3819 if (!psd) {
3820 return NT_STATUS_NO_MEMORY;
3821 }
3822
3823 /*
3824 * Get the current state of the file.
3825 */
3826
3827 status = vfs_stat_fsp(fsp);
3828 if (!NT_STATUS_IS_OK(status)) {
3829 return status;
3830 }
3831
3832 /* Save the original element we check against. */
3833 orig_mode = fsp->fsp_name->st.st_ex_mode;
3834
3835 /*
3836 * Unpack the user/group/world id's.
3837 */
3838
3839 /* POSIX can't cope with missing owner/group. */
3840 if ((security_info_sent & SECINFO_OWNER) && (psd->owner_sid == NULL)) {
3841 security_info_sent &= ~SECINFO_OWNER;
3842 }
3843 if ((security_info_sent & SECINFO_GROUP) && (psd->group_sid == NULL)) {
3844 security_info_sent &= ~SECINFO_GROUP;
3845 }
3846
3847 status = unpack_nt_owners( conn, &user, &grp, security_info_sent, psd);
3848 if (!NT_STATUS_IS_OK(status)) {
3849 return status;
3850 }
3851
3852 /*
3853 * Do we need to chown ? If so this must be done first as the incoming
3854 * CREATOR_OWNER acl will be relative to the *new* owner, not the old.
3855 * Noticed by Simo.
3856 */
3857
3858 if (((user != (uid_t)-1) && (fsp->fsp_name->st.st_ex_uid != user)) ||
3859 (( grp != (gid_t)-1) && (fsp->fsp_name->st.st_ex_gid != grp))) {
3860
3861 DEBUG(3,("set_nt_acl: chown %s. uid = %u, gid = %u.\n",
3862 fsp_str_dbg(fsp), (unsigned int)user,
3863 (unsigned int)grp));
3864
3865 status = try_chown(fsp, user, grp);
3866 if(!NT_STATUS_IS_OK(status)) {
3867 DEBUG(3,("set_nt_acl: chown %s, %u, %u failed. Error "
3868 "= %s.\n", fsp_str_dbg(fsp),
3869 (unsigned int)user,
3870 (unsigned int)grp,
3871 nt_errstr(status)));
3872 return status;
3873 }
3874
3875 /*
3876 * Recheck the current state of the file, which may have changed.
3877 * (suid/sgid bits, for instance)
3878 */
3879
3880 status = vfs_stat_fsp(fsp);
3881 if (!NT_STATUS_IS_OK(status)) {
3882 return status;
3883 }
3884
3885 /* Save the original element we check against. */
3886 orig_mode = fsp->fsp_name->st.st_ex_mode;
3887
3888 /* If we successfully chowned, we know we must
3889 * be able to set the acl, so do it as root.
3890 */
3891 set_acl_as_root = true;
3892 }
3893
3894 create_file_sids(&fsp->fsp_name->st, &file_owner_sid, &file_grp_sid);
3895
3896 if((security_info_sent & SECINFO_DACL) &&
3897 (psd->type & SEC_DESC_DACL_PRESENT) &&
3898 (psd->dacl == NULL)) {
3899 struct security_ace ace[3];
3900
3901 /* We can't have NULL DACL in POSIX.
3902 Use owner/group/Everyone -> full access. */
3903
3904 init_sec_ace(&ace[0],
3905 &file_owner_sid,
3906 SEC_ACE_TYPE_ACCESS_ALLOWED,
3907 GENERIC_ALL_ACCESS,
3908 0);
3909 init_sec_ace(&ace[1],
3910 &file_grp_sid,
3911 SEC_ACE_TYPE_ACCESS_ALLOWED,
3912 GENERIC_ALL_ACCESS,
3913 0);
3914 init_sec_ace(&ace[2],
3915 &global_sid_World,
3916 SEC_ACE_TYPE_ACCESS_ALLOWED,
3917 GENERIC_ALL_ACCESS,
3918 0);
3919 psd->dacl = make_sec_acl(talloc_tos(),
3920 NT4_ACL_REVISION,
3921 3,
3922 ace);
3923 if (psd->dacl == NULL) {
3924 return NT_STATUS_NO_MEMORY;
3925 }
3926 security_acl_map_generic(psd->dacl, &file_generic_mapping);
3927 }
3928
3929 acl_perms = unpack_canon_ace(fsp, &fsp->fsp_name->st, &file_owner_sid,
3930 &file_grp_sid, &file_ace_list,
3931 &dir_ace_list, security_info_sent, psd);
3932
3933 /* Ignore W2K traverse DACL set. */
3934 if (!file_ace_list && !dir_ace_list) {
3935 return NT_STATUS_OK;
3936 }
3937
3938 if (!acl_perms) {
3939 DEBUG(3,("set_nt_acl: cannot set permissions\n"));
3940 free_canon_ace_list(file_ace_list);
3941 free_canon_ace_list(dir_ace_list);
3942 return NT_STATUS_ACCESS_DENIED;
3943 }
3944
3945 /*
3946 * Only change security if we got a DACL.
3947 */
3948
3949 if(!(security_info_sent & SECINFO_DACL) || (psd->dacl == NULL)) {
3950 free_canon_ace_list(file_ace_list);
3951 free_canon_ace_list(dir_ace_list);
3952 return NT_STATUS_OK;
3953 }
3954
3955 /*
3956 * Try using the POSIX ACL set first. Fall back to chmod if
3957 * we have no ACL support on this filesystem.
3958 */
3959
3960 if (acl_perms && file_ace_list) {
3961 if (set_acl_as_root) {
3962 become_root();
3963 }
3964 ret = set_canon_ace_list(fsp, file_ace_list, false,
3965 &fsp->fsp_name->st, &acl_set_support);
3966 if (set_acl_as_root) {
3967 unbecome_root();
3968 }
3969 if (acl_set_support && ret == false) {
3970 DEBUG(3,("set_nt_acl: failed to set file acl on file "
3971 "%s (%s).\n", fsp_str_dbg(fsp),
3972 strerror(errno)));
3973 free_canon_ace_list(file_ace_list);
3974 free_canon_ace_list(dir_ace_list);
3975 return map_nt_error_from_unix(errno);
3976 }
3977 }
3978
3979 if (acl_perms && acl_set_support && fsp->is_directory) {
3980 if (dir_ace_list) {
3981 if (set_acl_as_root) {
3982 become_root();
3983 }
3984 ret = set_canon_ace_list(fsp, dir_ace_list, true,
3985 &fsp->fsp_name->st,
3986 &acl_set_support);
3987 if (set_acl_as_root) {
3988 unbecome_root();
3989 }
3990 if (ret == false) {
3991 DEBUG(3,("set_nt_acl: failed to set default "
3992 "acl on directory %s (%s).\n",
3993 fsp_str_dbg(fsp), strerror(errno)));
3994 free_canon_ace_list(file_ace_list);
3995 free_canon_ace_list(dir_ace_list);
3996 return map_nt_error_from_unix(errno);
3997 }
3998 } else {
3999 int sret = -1;
4000
4001 /*
4002 * No default ACL - delete one if it exists.
4003 */
4004
4005 if (set_acl_as_root) {
4006 become_root();
4007 }
4008 sret = SMB_VFS_SYS_ACL_DELETE_DEF_FILE(conn,
4009 fsp->fsp_name->base_name);
4010 if (set_acl_as_root) {
4011 unbecome_root();
4012 }
4013 if (sret == -1) {
4014 if (acl_group_override(conn, fsp->fsp_name)) {
4015 DEBUG(5,("set_nt_acl: acl group "
4016 "control on and current user "
4017 "in file %s primary group. "
4018 "Override delete_def_acl\n",
4019 fsp_str_dbg(fsp)));
4020
4021 become_root();
4022 sret =
4023 SMB_VFS_SYS_ACL_DELETE_DEF_FILE(
4024 conn,
4025 fsp->fsp_name->base_name);
4026 unbecome_root();
4027 }
4028
4029 if (sret == -1) {
4030 DEBUG(3,("set_nt_acl: sys_acl_delete_def_file failed (%s)\n", strerror(errno)));
4031 free_canon_ace_list(file_ace_list);
4032 free_canon_ace_list(dir_ace_list);
4033 return map_nt_error_from_unix(errno);
4034 }
4035 }
4036 }
4037 }
4038
4039 if (acl_set_support) {
4040 if (set_acl_as_root) {
4041 become_root();
4042 }
4043 store_inheritance_attributes(fsp,
4044 file_ace_list,
4045 dir_ace_list,
4046 psd->type);
4047 if (set_acl_as_root) {
4048 unbecome_root();
4049 }
4050 }
4051
4052 /*
4053 * If we cannot set using POSIX ACLs we fall back to checking if we need to chmod.
4054 */
4055
4056 if(!acl_set_support && acl_perms) {
4057 mode_t posix_perms;
4058
4059 if (!convert_canon_ace_to_posix_perms( fsp, file_ace_list, &posix_perms)) {
4060 free_canon_ace_list(file_ace_list);
4061 free_canon_ace_list(dir_ace_list);
4062 DEBUG(3,("set_nt_acl: failed to convert file acl to "
4063 "posix permissions for file %s.\n",
4064 fsp_str_dbg(fsp)));
4065 return NT_STATUS_ACCESS_DENIED;
4066 }
4067
4068 if (orig_mode != posix_perms) {
4069 int sret = -1;
4070
4071 DEBUG(3,("set_nt_acl: chmod %s. perms = 0%o.\n",
4072 fsp_str_dbg(fsp), (unsigned int)posix_perms));
4073
4074 if (set_acl_as_root) {
4075 become_root();
4076 }
4077 sret = SMB_VFS_CHMOD(conn, fsp->fsp_name->base_name,
4078 posix_perms);
4079 if (set_acl_as_root) {
4080 unbecome_root();
4081 }
4082 if(sret == -1) {
4083 if (acl_group_override(conn, fsp->fsp_name)) {
4084 DEBUG(5,("set_nt_acl: acl group "
4085 "control on and current user "
4086 "in file %s primary group. "
4087 "Override chmod\n",
4088 fsp_str_dbg(fsp)));
4089
4090 become_root();
4091 sret = SMB_VFS_CHMOD(conn,
4092 fsp->fsp_name->base_name,
4093 posix_perms);
4094 unbecome_root();
4095 }
4096
4097 if (sret == -1) {
4098 DEBUG(3,("set_nt_acl: chmod %s, 0%o "
4099 "failed. Error = %s.\n",
4100 fsp_str_dbg(fsp),
4101 (unsigned int)posix_perms,
4102 strerror(errno)));
4103 free_canon_ace_list(file_ace_list);
4104 free_canon_ace_list(dir_ace_list);
4105 return map_nt_error_from_unix(errno);
4106 }
4107 }
4108 }
4109 }
4110
4111 free_canon_ace_list(file_ace_list);
4112 free_canon_ace_list(dir_ace_list);
4113
4114 /* Ensure the stat struct in the fsp is correct. */
4115 status = vfs_stat_fsp(fsp);
4116
4117 return NT_STATUS_OK;
4118 }
4119
4120 /****************************************************************************
4121 Get the actual group bits stored on a file with an ACL. Has no effect if
4122 the file has no ACL. Needed in dosmode code where the stat() will return
4123 the mask bits, not the real group bits, for a file with an ACL.
4124 ****************************************************************************/
4125
4126 int get_acl_group_bits( connection_struct *conn, const char *fname, mode_t *mode )
4127 {
4128 int entry_id = SMB_ACL_FIRST_ENTRY;
4129 SMB_ACL_ENTRY_T entry;
4130 SMB_ACL_T posix_acl;
4131 int result = -1;
4132
4133 posix_acl = SMB_VFS_SYS_ACL_GET_FILE(conn, fname, SMB_ACL_TYPE_ACCESS);
4134 if (posix_acl == (SMB_ACL_T)NULL)
4135 return -1;
4136
4137 while (SMB_VFS_SYS_ACL_GET_ENTRY(conn, posix_acl, entry_id, &entry) == 1) {
4138 SMB_ACL_TAG_T tagtype;
4139 SMB_ACL_PERMSET_T permset;
4140
4141 entry_id = SMB_ACL_NEXT_ENTRY;
4142
4143 if (SMB_VFS_SYS_ACL_GET_TAG_TYPE(conn, entry, &tagtype) ==-1)
4144 break;
4145
4146 if (tagtype == SMB_ACL_GROUP_OBJ) {
4147 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, entry, &permset) == -1) {
4148 break;
4149 } else {
4150 *mode &= ~(S_IRGRP|S_IWGRP|S_IXGRP);
4151 *mode |= (SMB_VFS_SYS_ACL_GET_PERM(conn, permset, SMB_ACL_READ) ? S_IRGRP : 0);
4152 *mode |= (SMB_VFS_SYS_ACL_GET_PERM(conn, permset, SMB_ACL_WRITE) ? S_IWGRP : 0);
4153 *mode |= (SMB_VFS_SYS_ACL_GET_PERM(conn, permset, SMB_ACL_EXECUTE) ? S_IXGRP : 0);
4154 result = 0;
4155 break;
4156 }
4157 }
4158 }
4159 SMB_VFS_SYS_ACL_FREE_ACL(conn, posix_acl);
4160 return result;
4161 }
4162
4163 /****************************************************************************
4164 Do a chmod by setting the ACL USER_OBJ, GROUP_OBJ and OTHER bits in an ACL
4165 and set the mask to rwx. Needed to preserve complex ACLs set by NT.
4166 ****************************************************************************/
4167
4168 static int chmod_acl_internals( connection_struct *conn, SMB_ACL_T posix_acl, mode_t mode)
4169 {
4170 int entry_id = SMB_ACL_FIRST_ENTRY;
4171 SMB_ACL_ENTRY_T entry;
4172 int num_entries = 0;
4173
4174 while ( SMB_VFS_SYS_ACL_GET_ENTRY(conn, posix_acl, entry_id, &entry) == 1) {
4175 SMB_ACL_TAG_T tagtype;
4176 SMB_ACL_PERMSET_T permset;
4177 mode_t perms;
4178
4179 entry_id = SMB_ACL_NEXT_ENTRY;
4180
4181 if (SMB_VFS_SYS_ACL_GET_TAG_TYPE(conn, entry, &tagtype) == -1)
4182 return -1;
4183
4184 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, entry, &permset) == -1)
4185 return -1;
4186
4187 num_entries++;
4188
4189 switch(tagtype) {
4190 case SMB_ACL_USER_OBJ:
4191 perms = unix_perms_to_acl_perms(mode, S_IRUSR, S_IWUSR, S_IXUSR);
4192 break;
4193 case SMB_ACL_GROUP_OBJ:
4194 perms = unix_perms_to_acl_perms(mode, S_IRGRP, S_IWGRP, S_IXGRP);
4195 break;
4196 case SMB_ACL_MASK:
4197 /*
4198 * FIXME: The ACL_MASK entry permissions should really be set to
4199 * the union of the permissions of all ACL_USER,
4200 * ACL_GROUP_OBJ, and ACL_GROUP entries. That's what
4201 * acl_calc_mask() does, but Samba ACLs doesn't provide it.
4202 */
4203 perms = S_IRUSR|S_IWUSR|S_IXUSR;
4204 break;
4205 case SMB_ACL_OTHER:
4206 perms = unix_perms_to_acl_perms(mode, S_IROTH, S_IWOTH, S_IXOTH);
4207 break;
4208 default:
4209 continue;
4210 }
4211
4212 if (map_acl_perms_to_permset(conn, perms, &permset) == -1)
4213 return -1;
4214
4215 if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, entry, permset) == -1)
4216 return -1;
4217 }
4218
4219 /*
4220 * If this is a simple 3 element ACL or no elements then it's a standard
4221 * UNIX permission set. Just use chmod...
4222 */
4223
4224 if ((num_entries == 3) || (num_entries == 0))
4225 return -1;
4226
4227 return 0;
4228 }
4229
4230 /****************************************************************************
4231 Get the access ACL of FROM, do a chmod by setting the ACL USER_OBJ,
4232 GROUP_OBJ and OTHER bits in an ACL and set the mask to rwx. Set the
4233 resulting ACL on TO. Note that name is in UNIX character set.
4234 ****************************************************************************/
4235
4236 static int copy_access_posix_acl(connection_struct *conn, const char *from, const char *to, mode_t mode)
4237 {
4238 SMB_ACL_T posix_acl = NULL;
4239 int ret = -1;
4240
4241 if ((posix_acl = SMB_VFS_SYS_ACL_GET_FILE(conn, from, SMB_ACL_TYPE_ACCESS)) == NULL)
4242 return -1;
4243
4244 if ((ret = chmod_acl_internals(conn, posix_acl, mode)) == -1)
4245 goto done;
4246
4247 ret = SMB_VFS_SYS_ACL_SET_FILE(conn, to, SMB_ACL_TYPE_ACCESS, posix_acl);
4248
4249 done:
4250
4251 SMB_VFS_SYS_ACL_FREE_ACL(conn, posix_acl);
4252 return ret;
4253 }
4254
4255 /****************************************************************************
4256 Do a chmod by setting the ACL USER_OBJ, GROUP_OBJ and OTHER bits in an ACL
4257 and set the mask to rwx. Needed to preserve complex ACLs set by NT.
4258 Note that name is in UNIX character set.
4259 ****************************************************************************/
4260
4261 int chmod_acl(connection_struct *conn, const char *name, mode_t mode)
4262 {
4263 return copy_access_posix_acl(conn, name, name, mode);
4264 }
4265
4266 /****************************************************************************
4267 Check for an existing default POSIX ACL on a directory.
4268 ****************************************************************************/
4269
4270 static bool directory_has_default_posix_acl(connection_struct *conn, const char *fname)
4271 {
4272 SMB_ACL_T def_acl = SMB_VFS_SYS_ACL_GET_FILE( conn, fname, SMB_ACL_TYPE_DEFAULT);
4273 bool has_acl = False;
4274 SMB_ACL_ENTRY_T entry;
4275
4276 if (def_acl != NULL && (SMB_VFS_SYS_ACL_GET_ENTRY(conn, def_acl, SMB_ACL_FIRST_ENTRY, &entry) == 1)) {
4277 has_acl = True;
4278 }
4279
4280 if (def_acl) {
4281 SMB_VFS_SYS_ACL_FREE_ACL(conn, def_acl);
4282 }
4283 return has_acl;
4284 }
4285
4286 /****************************************************************************
4287 If the parent directory has no default ACL but it does have an Access ACL,
4288 inherit this Access ACL to file name.
4289 ****************************************************************************/
4290
4291 int inherit_access_posix_acl(connection_struct *conn, const char *inherit_from_dir,
4292 const char *name, mode_t mode)
4293 {
4294 if (directory_has_default_posix_acl(conn, inherit_from_dir))
4295 return 0;
4296
4297 return copy_access_posix_acl(conn, inherit_from_dir, name, mode);
4298 }
4299
4300 /****************************************************************************
4301 Do an fchmod by setting the ACL USER_OBJ, GROUP_OBJ and OTHER bits in an ACL
4302 and set the mask to rwx. Needed to preserve complex ACLs set by NT.
4303 ****************************************************************************/
4304
4305 int fchmod_acl(files_struct *fsp, mode_t mode)
4306 {
4307 connection_struct *conn = fsp->conn;
4308 SMB_ACL_T posix_acl = NULL;
4309 int ret = -1;
4310
4311 if ((posix_acl = SMB_VFS_SYS_ACL_GET_FD(fsp)) == NULL)
4312 return -1;
4313
4314 if ((ret = chmod_acl_internals(conn, posix_acl, mode)) == -1)
4315 goto done;
4316
4317 ret = SMB_VFS_SYS_ACL_SET_FD(fsp, posix_acl);
4318
4319 done:
4320
4321 SMB_VFS_SYS_ACL_FREE_ACL(conn, posix_acl);
4322 return ret;
4323 }
4324
4325 /****************************************************************************
4326 Map from wire type to permset.
4327 ****************************************************************************/
4328
4329 static bool unix_ex_wire_to_permset(connection_struct *conn, unsigned char wire_perm, SMB_ACL_PERMSET_T *p_permset)
4330 {
4331 if (wire_perm & ~(SMB_POSIX_ACL_READ|SMB_POSIX_ACL_WRITE|SMB_POSIX_ACL_EXECUTE)) {
4332 return False;
4333 }
4334
4335 if (SMB_VFS_SYS_ACL_CLEAR_PERMS(conn, *p_permset) == -1) {
4336 return False;
4337 }
4338
4339 if (wire_perm & SMB_POSIX_ACL_READ) {
4340 if (SMB_VFS_SYS_ACL_ADD_PERM(conn, *p_permset, SMB_ACL_READ) == -1) {
4341 return False;
4342 }
4343 }
4344 if (wire_perm & SMB_POSIX_ACL_WRITE) {
4345 if (SMB_VFS_SYS_ACL_ADD_PERM(conn, *p_permset, SMB_ACL_WRITE) == -1) {
4346 return False;
4347 }
4348 }
4349 if (wire_perm & SMB_POSIX_ACL_EXECUTE) {
4350 if (SMB_VFS_SYS_ACL_ADD_PERM(conn, *p_permset, SMB_ACL_EXECUTE) == -1) {
4351 return False;
4352 }
4353 }
4354 return True;
4355 }
4356
4357 /****************************************************************************
4358 Map from wire type to tagtype.
4359 ****************************************************************************/
4360
4361 static bool unix_ex_wire_to_tagtype(unsigned char wire_tt, SMB_ACL_TAG_T *p_tt)
4362 {
4363 switch (wire_tt) {
4364 case SMB_POSIX_ACL_USER_OBJ:
4365 *p_tt = SMB_ACL_USER_OBJ;
4366 break;
4367 case SMB_POSIX_ACL_USER:
4368 *p_tt = SMB_ACL_USER;
4369 break;
4370 case SMB_POSIX_ACL_GROUP_OBJ:
4371 *p_tt = SMB_ACL_GROUP_OBJ;
4372 break;
4373 case SMB_POSIX_ACL_GROUP:
4374 *p_tt = SMB_ACL_GROUP;
4375 break;
4376 case SMB_POSIX_ACL_MASK:
4377 *p_tt = SMB_ACL_MASK;
4378 break;
4379 case SMB_POSIX_ACL_OTHER:
4380 *p_tt = SMB_ACL_OTHER;
4381 break;
4382 default:
4383 return False;
4384 }
4385 return True;
4386 }
4387
4388 /****************************************************************************
4389 Create a new POSIX acl from wire permissions.
4390 FIXME ! How does the share mask/mode fit into this.... ?
4391 ****************************************************************************/
4392
4393 static SMB_ACL_T create_posix_acl_from_wire(connection_struct *conn, uint16 num_acls, const char *pdata)
4394 {
4395 unsigned int i;
4396 SMB_ACL_T the_acl = SMB_VFS_SYS_ACL_INIT(conn, num_acls);
4397
4398 if (the_acl == NULL) {
4399 return NULL;
4400 }
4401
4402 for (i = 0; i < num_acls; i++) {
4403 SMB_ACL_ENTRY_T the_entry;
4404 SMB_ACL_PERMSET_T the_permset;
4405 SMB_ACL_TAG_T tag_type;
4406
4407 if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &the_acl, &the_entry) == -1) {
4408 DEBUG(0,("create_posix_acl_from_wire: Failed to create entry %u. (%s)\n",
4409 i, strerror(errno) ));
4410 goto fail;
4411 }
4412
4413 if (!unix_ex_wire_to_tagtype(CVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)), &tag_type)) {
4414 DEBUG(0,("create_posix_acl_from_wire: invalid wire tagtype %u on entry %u.\n",
4415 CVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)), i ));
4416 goto fail;
4417 }
4418
4419 if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, the_entry, tag_type) == -1) {
4420 DEBUG(0,("create_posix_acl_from_wire: Failed to set tagtype on entry %u. (%s)\n",
4421 i, strerror(errno) ));
4422 goto fail;
4423 }
4424
4425 /* Get the permset pointer from the new ACL entry. */
4426 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, the_entry, &the_permset) == -1) {
4427 DEBUG(0,("create_posix_acl_from_wire: Failed to get permset on entry %u. (%s)\n",
4428 i, strerror(errno) ));
4429 goto fail;
4430 }
4431
4432 /* Map from wire to permissions. */
4433 if (!unix_ex_wire_to_permset(conn, CVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)+1), &the_permset)) {
4434 DEBUG(0,("create_posix_acl_from_wire: invalid permset %u on entry %u.\n",
4435 CVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE) + 1), i ));
4436 goto fail;
4437 }
4438
4439 /* Now apply to the new ACL entry. */
4440 if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, the_entry, the_permset) == -1) {
4441 DEBUG(0,("create_posix_acl_from_wire: Failed to add permset on entry %u. (%s)\n",
4442 i, strerror(errno) ));
4443 goto fail;
4444 }
4445
4446 if (tag_type == SMB_ACL_USER) {
4447 uint32 uidval = IVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)+2);
4448 uid_t uid = (uid_t)uidval;
4449 if (SMB_VFS_SYS_ACL_SET_QUALIFIER(conn, the_entry,(void *)&uid) == -1) {
4450 DEBUG(0,("create_posix_acl_from_wire: Failed to set uid %u on entry %u. (%s)\n",
4451 (unsigned int)uid, i, strerror(errno) ));
4452 goto fail;
4453 }
4454 }
4455
4456 if (tag_type == SMB_ACL_GROUP) {
4457 uint32 gidval = IVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)+2);
4458 gid_t gid = (uid_t)gidval;
4459 if (SMB_VFS_SYS_ACL_SET_QUALIFIER(conn, the_entry,(void *)&gid) == -1) {
4460 DEBUG(0,("create_posix_acl_from_wire: Failed to set gid %u on entry %u. (%s)\n",
4461 (unsigned int)gid, i, strerror(errno) ));
4462 goto fail;
4463 }
4464 }
4465 }
4466
4467 return the_acl;
4468
4469 fail:
4470
4471 if (the_acl != NULL) {
4472 SMB_VFS_SYS_ACL_FREE_ACL(conn, the_acl);
4473 }
4474 return NULL;
4475 }
4476
4477 /****************************************************************************
4478 Calls from UNIX extensions - Default POSIX ACL set.
4479 If num_def_acls == 0 and not a directory just return. If it is a directory
4480 and num_def_acls == 0 then remove the default acl. Else set the default acl
4481 on the directory.
4482 ****************************************************************************/
4483
4484 bool set_unix_posix_default_acl(connection_struct *conn, const char *fname, const SMB_STRUCT_STAT *psbuf,
4485 uint16 num_def_acls, const char *pdata)
4486 {
4487 SMB_ACL_T def_acl = NULL;
4488
4489 if (!S_ISDIR(psbuf->st_ex_mode)) {
4490 if (num_def_acls) {
4491 DEBUG(5,("set_unix_posix_default_acl: Can't set default ACL on non-directory file %s\n", fname ));
4492 errno = EISDIR;
4493 return False;
4494 } else {
4495 return True;
4496 }
4497 }
4498
4499 if (!num_def_acls) {
4500 /* Remove the default ACL. */
4501 if (SMB_VFS_SYS_ACL_DELETE_DEF_FILE(conn, fname) == -1) {
4502 DEBUG(5,("set_unix_posix_default_acl: acl_delete_def_file failed on directory %s (%s)\n",
4503 fname, strerror(errno) ));
4504 return False;
4505 }
4506 return True;
4507 }
4508
4509 if ((def_acl = create_posix_acl_from_wire(conn, num_def_acls, pdata)) == NULL) {
4510 return False;
4511 }
4512
4513 if (SMB_VFS_SYS_ACL_SET_FILE(conn, fname, SMB_ACL_TYPE_DEFAULT, def_acl) == -1) {
4514 DEBUG(5,("set_unix_posix_default_acl: acl_set_file failed on directory %s (%s)\n",
4515 fname, strerror(errno) ));
4516 SMB_VFS_SYS_ACL_FREE_ACL(conn, def_acl);
4517 return False;
4518 }
4519
4520 DEBUG(10,("set_unix_posix_default_acl: set default acl for file %s\n", fname ));
4521 SMB_VFS_SYS_ACL_FREE_ACL(conn, def_acl);
4522 return True;
4523 }
4524
4525 /****************************************************************************
4526 Remove an ACL from a file. As we don't have acl_delete_entry() available
4527 we must read the current acl and copy all entries except MASK, USER and GROUP
4528 to a new acl, then set that. This (at least on Linux) causes any ACL to be
4529 removed.
4530 FIXME ! How does the share mask/mode fit into this.... ?
4531 ****************************************************************************/
4532
4533 static bool remove_posix_acl(connection_struct *conn, files_struct *fsp, const char *fname)
4534 {
4535 SMB_ACL_T file_acl = NULL;
4536 int entry_id = SMB_ACL_FIRST_ENTRY;
4537 SMB_ACL_ENTRY_T entry;
4538 bool ret = False;
4539 /* Create a new ACL with only 3 entries, u/g/w. */
4540 SMB_ACL_T new_file_acl = SMB_VFS_SYS_ACL_INIT(conn, 3);
4541 SMB_ACL_ENTRY_T user_ent = NULL;
4542 SMB_ACL_ENTRY_T group_ent = NULL;
4543 SMB_ACL_ENTRY_T other_ent = NULL;
4544
4545 if (new_file_acl == NULL) {
4546 DEBUG(5,("remove_posix_acl: failed to init new ACL with 3 entries for file %s.\n", fname));
4547 return False;
4548 }
4549
4550 /* Now create the u/g/w entries. */
4551 if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &new_file_acl, &user_ent) == -1) {
4552 DEBUG(5,("remove_posix_acl: Failed to create user entry for file %s. (%s)\n",
4553 fname, strerror(errno) ));
4554 goto done;
4555 }
4556 if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, user_ent, SMB_ACL_USER_OBJ) == -1) {
4557 DEBUG(5,("remove_posix_acl: Failed to set user entry for file %s. (%s)\n",
4558 fname, strerror(errno) ));
4559 goto done;
4560 }
4561
4562 if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &new_file_acl, &group_ent) == -1) {
4563 DEBUG(5,("remove_posix_acl: Failed to create group entry for file %s. (%s)\n",
4564 fname, strerror(errno) ));
4565 goto done;
4566 }
4567 if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, group_ent, SMB_ACL_GROUP_OBJ) == -1) {
4568 DEBUG(5,("remove_posix_acl: Failed to set group entry for file %s. (%s)\n",
4569 fname, strerror(errno) ));
4570 goto done;
4571 }
4572
4573 if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &new_file_acl, &other_ent) == -1) {
4574 DEBUG(5,("remove_posix_acl: Failed to create other entry for file %s. (%s)\n",
4575 fname, strerror(errno) ));
4576 goto done;
4577 }
4578 if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, other_ent, SMB_ACL_OTHER) == -1) {
4579 DEBUG(5,("remove_posix_acl: Failed to set other entry for file %s. (%s)\n",
4580 fname, strerror(errno) ));
4581 goto done;
4582 }
4583
4584 /* Get the current file ACL. */
4585 if (fsp && fsp->fh->fd != -1) {
4586 file_acl = SMB_VFS_SYS_ACL_GET_FD(fsp);
4587 } else {
4588 file_acl = SMB_VFS_SYS_ACL_GET_FILE( conn, fname, SMB_ACL_TYPE_ACCESS);
4589 }
4590
4591 if (file_acl == NULL) {
4592 /* This is only returned if an error occurred. Even for a file with
4593 no acl a u/g/w acl should be returned. */
4594 DEBUG(5,("remove_posix_acl: failed to get ACL from file %s (%s).\n",
4595 fname, strerror(errno) ));
4596 goto done;
4597 }
4598
4599 while ( SMB_VFS_SYS_ACL_GET_ENTRY(conn, file_acl, entry_id, &entry) == 1) {
4600 SMB_ACL_TAG_T tagtype;
4601 SMB_ACL_PERMSET_T permset;
4602
4603 entry_id = SMB_ACL_NEXT_ENTRY;
4604
4605 if (SMB_VFS_SYS_ACL_GET_TAG_TYPE(conn, entry, &tagtype) == -1) {
4606 DEBUG(5,("remove_posix_acl: failed to get tagtype from ACL on file %s (%s).\n",
4607 fname, strerror(errno) ));
4608 goto done;
4609 }
4610
4611 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, entry, &permset) == -1) {
4612 DEBUG(5,("remove_posix_acl: failed to get permset from ACL on file %s (%s).\n",
4613 fname, strerror(errno) ));
4614 goto done;
4615 }
4616
4617 if (tagtype == SMB_ACL_USER_OBJ) {
4618 if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, user_ent, permset) == -1) {
4619 DEBUG(5,("remove_posix_acl: failed to set permset from ACL on file %s (%s).\n",
4620 fname, strerror(errno) ));
4621 }
4622 } else if (tagtype == SMB_ACL_GROUP_OBJ) {
4623 if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, group_ent, permset) == -1) {
4624 DEBUG(5,("remove_posix_acl: failed to set permset from ACL on file %s (%s).\n",
4625 fname, strerror(errno) ));
4626 }
4627 } else if (tagtype == SMB_ACL_OTHER) {
4628 if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, other_ent, permset) == -1) {
4629 DEBUG(5,("remove_posix_acl: failed to set permset from ACL on file %s (%s).\n",
4630 fname, strerror(errno) ));
4631 }
4632 }
4633 }
4634
4635 /* Set the new empty file ACL. */
4636 if (fsp && fsp->fh->fd != -1) {
4637 if (SMB_VFS_SYS_ACL_SET_FD(fsp, new_file_acl) == -1) {
4638 DEBUG(5,("remove_posix_acl: acl_set_file failed on %s (%s)\n",
4639 fname, strerror(errno) ));
4640 goto done;
4641 }
4642 } else {
4643 if (SMB_VFS_SYS_ACL_SET_FILE(conn, fname, SMB_ACL_TYPE_ACCESS, new_file_acl) == -1) {
4644 DEBUG(5,("remove_posix_acl: acl_set_file failed on %s (%s)\n",
4645 fname, strerror(errno) ));
4646 goto done;
4647 }
4648 }
4649
4650 ret = True;
4651
4652 done:
4653
4654 if (file_acl) {
4655 SMB_VFS_SYS_ACL_FREE_ACL(conn, file_acl);
4656 }
4657 if (new_file_acl) {
4658 SMB_VFS_SYS_ACL_FREE_ACL(conn, new_file_acl);
4659 }
4660 return ret;
4661 }
4662
4663 /****************************************************************************
4664 Calls from UNIX extensions - POSIX ACL set.
4665 If num_def_acls == 0 then read/modify/write acl after removing all entries
4666 except SMB_ACL_USER_OBJ, SMB_ACL_GROUP_OBJ, SMB_ACL_OTHER.
4667 ****************************************************************************/
4668
4669 bool set_unix_posix_acl(connection_struct *conn, files_struct *fsp, const char *fname, uint16 num_acls, const char *pdata)
4670 {
4671 SMB_ACL_T file_acl = NULL;
4672
4673 if (!num_acls) {
4674 /* Remove the ACL from the file. */
4675 return remove_posix_acl(conn, fsp, fname);
4676 }
4677
4678 if ((file_acl = create_posix_acl_from_wire(conn, num_acls, pdata)) == NULL) {
4679 return False;
4680 }
4681
4682 if (fsp && fsp->fh->fd != -1) {
4683 /* The preferred way - use an open fd. */
4684 if (SMB_VFS_SYS_ACL_SET_FD(fsp, file_acl) == -1) {
4685 DEBUG(5,("set_unix_posix_acl: acl_set_file failed on %s (%s)\n",
4686 fname, strerror(errno) ));
4687 SMB_VFS_SYS_ACL_FREE_ACL(conn, file_acl);
4688 return False;
4689 }
4690 } else {
4691 if (SMB_VFS_SYS_ACL_SET_FILE(conn, fname, SMB_ACL_TYPE_ACCESS, file_acl) == -1) {
4692 DEBUG(5,("set_unix_posix_acl: acl_set_file failed on %s (%s)\n",
4693 fname, strerror(errno) ));
4694 SMB_VFS_SYS_ACL_FREE_ACL(conn, file_acl);
4695 return False;
4696 }
4697 }
4698
4699 DEBUG(10,("set_unix_posix_acl: set acl for file %s\n", fname ));
4700 SMB_VFS_SYS_ACL_FREE_ACL(conn, file_acl);
4701 return True;
4702 }
4703
4704 /********************************************************************
4705 Pull the NT ACL from a file on disk or the OpenEventlog() access
4706 check. Caller is responsible for freeing the returned security
4707 descriptor via TALLOC_FREE(). This is designed for dealing with
4708 user space access checks in smbd outside of the VFS. For example,
4709 checking access rights in OpenEventlog().
4710
4711 Assume we are dealing with files (for now)
4712 ********************************************************************/
4713
4714 struct security_descriptor *get_nt_acl_no_snum( TALLOC_CTX *ctx, const char *fname)
4715 {
4716 struct security_descriptor *psd, *ret_sd;
4717 connection_struct *conn;
4718 files_struct finfo;
4719 struct fd_handle fh;
4720 NTSTATUS status;
4721
4722 conn = talloc_zero(ctx, connection_struct);
4723 if (conn == NULL) {
4724 DEBUG(0, ("talloc failed\n"));
4725 return NULL;
4726 }
4727
4728 if (!(conn->params = talloc(conn, struct share_params))) {
4729 DEBUG(0,("get_nt_acl_no_snum: talloc() failed!\n"));
4730 TALLOC_FREE(conn);
4731 return NULL;
4732 }
4733
4734 conn->params->service = -1;
4735
4736 set_conn_connectpath(conn, "/");
4737
4738 if (!smbd_vfs_init(conn)) {
4739 DEBUG(0,("get_nt_acl_no_snum: Unable to create a fake connection struct!\n"));
4740 conn_free(conn);
4741 return NULL;
4742 }
4743
4744 ZERO_STRUCT( finfo );
4745 ZERO_STRUCT( fh );
4746
4747 finfo.fnum = -1;
4748 finfo.conn = conn;
4749 finfo.fh = &fh;
4750 finfo.fh->fd = -1;
4751
4752 status = create_synthetic_smb_fname(talloc_tos(), fname, NULL, NULL,
4753 &finfo.fsp_name);
4754 if (!NT_STATUS_IS_OK(status)) {
4755 conn_free(conn);
4756 return NULL;
4757 }
4758
4759 if (!NT_STATUS_IS_OK(SMB_VFS_FGET_NT_ACL( &finfo, SECINFO_DACL, &psd))) {
4760 DEBUG(0,("get_nt_acl_no_snum: get_nt_acl returned zero.\n"));
4761 TALLOC_FREE(finfo.fsp_name);
4762 conn_free(conn);
4763 return NULL;
4764 }
4765
4766 ret_sd = dup_sec_desc( ctx, psd );
4767
4768 TALLOC_FREE(finfo.fsp_name);
4769 conn_free(conn);
4770
4771 return ret_sd;
4772 }
4773
4774 /* Stolen shamelessly from pvfs_default_acl() in source4 :-). */
4775
4776 NTSTATUS make_default_filesystem_acl(TALLOC_CTX *ctx,
4777 const char *name,
4778 SMB_STRUCT_STAT *psbuf,
4779 struct security_descriptor **ppdesc)
4780 {
4781 struct dom_sid owner_sid, group_sid;
4782 size_t size = 0;
4783 struct security_ace aces[4];
4784 uint32_t access_mask = 0;
4785 mode_t mode = psbuf->st_ex_mode;
4786 struct security_acl *new_dacl = NULL;
4787 int idx = 0;
4788
4789 DEBUG(10,("make_default_filesystem_acl: file %s mode = 0%o\n",
4790 name, (int)mode ));
4791
4792 uid_to_sid(&owner_sid, psbuf->st_ex_uid);
4793 gid_to_sid(&group_sid, psbuf->st_ex_gid);
4794
4795 /*
4796 We provide up to 4 ACEs
4797 - Owner
4798 - Group
4799 - Everyone
4800 - NT System
4801 */
4802
4803 if (mode & S_IRUSR) {
4804 if (mode & S_IWUSR) {
4805 access_mask |= SEC_RIGHTS_FILE_ALL;
4806 } else {
4807 access_mask |= SEC_RIGHTS_FILE_READ | SEC_FILE_EXECUTE;
4808 }
4809 }
4810 if (mode & S_IWUSR) {
4811 access_mask |= SEC_RIGHTS_FILE_WRITE | SEC_STD_DELETE;
4812 }
4813
4814 init_sec_ace(&aces[idx],
4815 &owner_sid,
4816 SEC_ACE_TYPE_ACCESS_ALLOWED,
4817 access_mask,
4818 0);
4819 idx++;
4820
4821 access_mask = 0;
4822 if (mode & S_IRGRP) {
4823 access_mask |= SEC_RIGHTS_FILE_READ | SEC_FILE_EXECUTE;
4824 }
4825 if (mode & S_IWGRP) {
4826 /* note that delete is not granted - this matches posix behaviour */
4827 access_mask |= SEC_RIGHTS_FILE_WRITE;
4828 }
4829 if (access_mask) {
4830 init_sec_ace(&aces[idx],
4831 &group_sid,
4832 SEC_ACE_TYPE_ACCESS_ALLOWED,
4833 access_mask,
4834 0);
4835 idx++;
4836 }
4837
4838 access_mask = 0;
4839 if (mode & S_IROTH) {
4840 access_mask |= SEC_RIGHTS_FILE_READ | SEC_FILE_EXECUTE;
4841 }
4842 if (mode & S_IWOTH) {
4843 access_mask |= SEC_RIGHTS_FILE_WRITE;
4844 }
4845 if (access_mask) {
4846 init_sec_ace(&aces[idx],
4847 &global_sid_World,
4848 SEC_ACE_TYPE_ACCESS_ALLOWED,
4849 access_mask,
4850 0);
4851 idx++;
4852 }
4853
4854 init_sec_ace(&aces[idx],
4855 &global_sid_System,
4856 SEC_ACE_TYPE_ACCESS_ALLOWED,
4857 SEC_RIGHTS_FILE_ALL,
4858 0);
4859 idx++;
4860
4861 new_dacl = make_sec_acl(ctx,
4862 NT4_ACL_REVISION,
4863 idx,
4864 aces);
4865
4866 if (!new_dacl) {
4867 return NT_STATUS_NO_MEMORY;
4868 }
4869
4870 *ppdesc = make_sec_desc(ctx,
4871 SECURITY_DESCRIPTOR_REVISION_1,
4872 SEC_DESC_SELF_RELATIVE|SEC_DESC_DACL_PRESENT,
4873 &owner_sid,
4874 &group_sid,
4875 NULL,
4876 new_dacl,
4877 &size);
4878 if (!*ppdesc) {
4879 return NT_STATUS_NO_MEMORY;
4880 }
4881 return NT_STATUS_OK;
4882 }
reg import