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s3-torture/denytest.c: replace cli_read_old() with cli_read()
[Samba/gebeck_regimport.git] / source3 / smbd / posix_acls.c
blobda25a52b8dbdc473e470b7bd0a18a7665d0e9d75
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 = (char *)SMB_MALLOC(*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 SAFE_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 SAFE_FREE(paie);
308 }
309 for (paie = pal->def_entry_list; paie; paie = paie_next) {
310 paie_next = paie->next;
311 SAFE_FREE(paie);
312 }
313 SAFE_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 = SMB_MALLOC_P(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 SAFE_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 = SMB_MALLOC_P(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 = SMB_MALLOC_P(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 SAFE_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 = SMB_MALLOC_P(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 = (char *)SMB_MALLOC(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 SAFE_FREE(pai_buf);
644 if (pai_buf_size > 1024*1024) {
645 return NULL; /* Limit malloc to 1mb. */
646 }
647 if ((pai_buf = (char *)SMB_MALLOC(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 SAFE_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 SAFE_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 = (char *)SMB_MALLOC(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 SAFE_FREE(pai_buf);
711 if (pai_buf_size > 1024*1024) {
712 return NULL; /* Limit malloc to 1mb. */
713 }
714 if ((pai_buf = (char *)SMB_MALLOC(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 SAFE_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 SAFE_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 SAFE_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 = SMB_MALLOC_P(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 SAFE_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 SAFE_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 SAFE_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|FILE_READ_ATTRIBUTES)
1134 #define FILE_SPECIFIC_WRITE_BITS (FILE_WRITE_DATA|FILE_APPEND_DATA|FILE_WRITE_EA|FILE_WRITE_ATTRIBUTES)
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 bool got_user = False;
1366 bool got_grp = False;
1367 bool got_other = False;
1368 canon_ace *pace_other = NULL;
1369
1370 for (pace = *pp_ace; pace; pace = pace->next) {
1371 if (pace->type == SMB_ACL_USER_OBJ) {
1372
1373 if (setting_acl)
1374 apply_default_perms(params, is_directory, pace, S_IRUSR);
1375 got_user = True;
1376
1377 } else if (pace->type == SMB_ACL_GROUP_OBJ) {
1378
1379 /*
1380 * Ensure create mask/force create mode is respected on set.
1381 */
1382
1383 if (setting_acl)
1384 apply_default_perms(params, is_directory, pace, S_IRGRP);
1385 got_grp = True;
1386
1387 } else if (pace->type == SMB_ACL_OTHER) {
1388
1389 /*
1390 * Ensure create mask/force create mode is respected on set.
1391 */
1392
1393 if (setting_acl)
1394 apply_default_perms(params, is_directory, pace, S_IROTH);
1395 got_other = True;
1396 pace_other = pace;
1397 }
1398 }
1399
1400 if (!got_user) {
1401 if ((pace = SMB_MALLOC_P(canon_ace)) == NULL) {
1402 DEBUG(0,("ensure_canon_entry_valid: malloc fail.\n"));
1403 return False;
1404 }
1405
1406 ZERO_STRUCTP(pace);
1407 pace->type = SMB_ACL_USER_OBJ;
1408 pace->owner_type = UID_ACE;
1409 pace->unix_ug.uid = pst->st_ex_uid;
1410 pace->trustee = *pfile_owner_sid;
1411 pace->attr = ALLOW_ACE;
1412
1413 if (setting_acl) {
1414 /* See if the owning user is in any of the other groups in
1415 the ACE. If so, OR in the permissions from that group. */
1416
1417 bool group_matched = False;
1418 canon_ace *pace_iter;
1419
1420 for (pace_iter = *pp_ace; pace_iter; pace_iter = pace_iter->next) {
1421 if (pace_iter->type == SMB_ACL_GROUP_OBJ || pace_iter->type == SMB_ACL_GROUP) {
1422 if (uid_entry_in_group(conn, pace, pace_iter)) {
1423 pace->perms |= pace_iter->perms;
1424 group_matched = True;
1425 }
1426 }
1427 }
1428
1429 /* If we only got an "everyone" perm, just use that. */
1430 if (!group_matched) {
1431 if (got_other)
1432 pace->perms = pace_other->perms;
1433 else
1434 pace->perms = 0;
1435 }
1436
1437 apply_default_perms(params, is_directory, pace, S_IRUSR);
1438 } else {
1439 pace->perms = unix_perms_to_acl_perms(pst->st_ex_mode, S_IRUSR, S_IWUSR, S_IXUSR);
1440 }
1441
1442 DLIST_ADD(*pp_ace, pace);
1443 }
1444
1445 if (!got_grp) {
1446 if ((pace = SMB_MALLOC_P(canon_ace)) == NULL) {
1447 DEBUG(0,("ensure_canon_entry_valid: malloc fail.\n"));
1448 return False;
1449 }
1450
1451 ZERO_STRUCTP(pace);
1452 pace->type = SMB_ACL_GROUP_OBJ;
1453 pace->owner_type = GID_ACE;
1454 pace->unix_ug.uid = pst->st_ex_gid;
1455 pace->trustee = *pfile_grp_sid;
1456 pace->attr = ALLOW_ACE;
1457 if (setting_acl) {
1458 /* If we only got an "everyone" perm, just use that. */
1459 if (got_other)
1460 pace->perms = pace_other->perms;
1461 else
1462 pace->perms = 0;
1463 apply_default_perms(params, is_directory, pace, S_IRGRP);
1464 } else {
1465 pace->perms = unix_perms_to_acl_perms(pst->st_ex_mode, S_IRGRP, S_IWGRP, S_IXGRP);
1466 }
1467
1468 DLIST_ADD(*pp_ace, pace);
1469 }
1470
1471 if (!got_other) {
1472 if ((pace = SMB_MALLOC_P(canon_ace)) == NULL) {
1473 DEBUG(0,("ensure_canon_entry_valid: malloc fail.\n"));
1474 return False;
1475 }
1476
1477 ZERO_STRUCTP(pace);
1478 pace->type = SMB_ACL_OTHER;
1479 pace->owner_type = WORLD_ACE;
1480 pace->unix_ug.world = -1;
1481 pace->trustee = global_sid_World;
1482 pace->attr = ALLOW_ACE;
1483 if (setting_acl) {
1484 pace->perms = 0;
1485 apply_default_perms(params, is_directory, pace, S_IROTH);
1486 } else
1487 pace->perms = unix_perms_to_acl_perms(pst->st_ex_mode, S_IROTH, S_IWOTH, S_IXOTH);
1488
1489 DLIST_ADD(*pp_ace, pace);
1490 }
1491
1492 return True;
1493 }
1494
1495 /****************************************************************************
1496 Check if a POSIX ACL has the required SMB_ACL_USER_OBJ and SMB_ACL_GROUP_OBJ entries.
1497 If it does not have them, check if there are any entries where the trustee is the
1498 file owner or the owning group, and map these to SMB_ACL_USER_OBJ and SMB_ACL_GROUP_OBJ.
1499 ****************************************************************************/
1500
1501 static void check_owning_objs(canon_ace *ace, struct dom_sid *pfile_owner_sid, struct dom_sid *pfile_grp_sid)
1502 {
1503 bool got_user_obj, got_group_obj;
1504 canon_ace *current_ace;
1505 int i, entries;
1506
1507 entries = count_canon_ace_list(ace);
1508 got_user_obj = False;
1509 got_group_obj = False;
1510
1511 for (i=0, current_ace = ace; i < entries; i++, current_ace = current_ace->next) {
1512 if (current_ace->type == SMB_ACL_USER_OBJ)
1513 got_user_obj = True;
1514 else if (current_ace->type == SMB_ACL_GROUP_OBJ)
1515 got_group_obj = True;
1516 }
1517 if (got_user_obj && got_group_obj) {
1518 DEBUG(10,("check_owning_objs: ACL had owning user/group entries.\n"));
1519 return;
1520 }
1521
1522 for (i=0, current_ace = ace; i < entries; i++, current_ace = current_ace->next) {
1523 if (!got_user_obj && current_ace->owner_type == UID_ACE &&
1524 dom_sid_equal(&current_ace->trustee, pfile_owner_sid)) {
1525 current_ace->type = SMB_ACL_USER_OBJ;
1526 got_user_obj = True;
1527 }
1528 if (!got_group_obj && current_ace->owner_type == GID_ACE &&
1529 dom_sid_equal(&current_ace->trustee, pfile_grp_sid)) {
1530 current_ace->type = SMB_ACL_GROUP_OBJ;
1531 got_group_obj = True;
1532 }
1533 }
1534 if (!got_user_obj)
1535 DEBUG(10,("check_owning_objs: ACL is missing an owner entry.\n"));
1536 if (!got_group_obj)
1537 DEBUG(10,("check_owning_objs: ACL is missing an owning group entry.\n"));
1538 }
1539
1540 /****************************************************************************
1541 If an ACE entry is SMB_ACL_USER_OBJ and not CREATOR_OWNER, map to SMB_ACL_USER.
1542 If an ACE entry is SMB_ACL_GROUP_OBJ and not CREATOR_GROUP, map to SMB_ACL_GROUP
1543 ****************************************************************************/
1544
1545 static bool dup_owning_ace(canon_ace *dir_ace, canon_ace *ace)
1546 {
1547 /* dir ace must be followings.
1548 SMB_ACL_USER_OBJ : trustee(CREATOR_OWNER) -> Posix ACL d:u::perm
1549 SMB_ACL_USER : not trustee -> Posix ACL u:user:perm
1550 SMB_ACL_USER_OBJ : trustee -> convert to SMB_ACL_USER : trustee
1551 Posix ACL u:trustee:perm
1552
1553 SMB_ACL_GROUP_OBJ: trustee(CREATOR_GROUP) -> Posix ACL d:g::perm
1554 SMB_ACL_GROUP : not trustee -> Posix ACL g:group:perm
1555 SMB_ACL_GROUP_OBJ: trustee -> convert to SMB_ACL_GROUP : trustee
1556 Posix ACL g:trustee:perm
1557 */
1558
1559 if (ace->type == SMB_ACL_USER_OBJ &&
1560 !(dom_sid_equal(&ace->trustee, &global_sid_Creator_Owner))) {
1561 canon_ace *dup_ace = dup_canon_ace(ace);
1562
1563 if (dup_ace == NULL) {
1564 return false;
1565 }
1566 dup_ace->type = SMB_ACL_USER;
1567 DLIST_ADD_END(dir_ace, dup_ace, canon_ace *);
1568 }
1569
1570 if (ace->type == SMB_ACL_GROUP_OBJ &&
1571 !(dom_sid_equal(&ace->trustee, &global_sid_Creator_Group))) {
1572 canon_ace *dup_ace = dup_canon_ace(ace);
1573
1574 if (dup_ace == NULL) {
1575 return false;
1576 }
1577 dup_ace->type = SMB_ACL_GROUP;
1578 DLIST_ADD_END(dir_ace, dup_ace, canon_ace *);
1579 }
1580
1581 return true;
1582 }
1583
1584 /****************************************************************************
1585 Unpack a struct security_descriptor into two canonical ace lists.
1586 ****************************************************************************/
1587
1588 static bool create_canon_ace_lists(files_struct *fsp,
1589 const SMB_STRUCT_STAT *pst,
1590 struct dom_sid *pfile_owner_sid,
1591 struct dom_sid *pfile_grp_sid,
1592 canon_ace **ppfile_ace,
1593 canon_ace **ppdir_ace,
1594 const struct security_acl *dacl)
1595 {
1596 bool all_aces_are_inherit_only = (fsp->is_directory ? True : False);
1597 canon_ace *file_ace = NULL;
1598 canon_ace *dir_ace = NULL;
1599 canon_ace *current_ace = NULL;
1600 bool got_dir_allow = False;
1601 bool got_file_allow = False;
1602 int i, j;
1603
1604 *ppfile_ace = NULL;
1605 *ppdir_ace = NULL;
1606
1607 /*
1608 * Convert the incoming ACL into a more regular form.
1609 */
1610
1611 for(i = 0; i < dacl->num_aces; i++) {
1612 struct security_ace *psa = &dacl->aces[i];
1613
1614 if((psa->type != SEC_ACE_TYPE_ACCESS_ALLOWED) && (psa->type != SEC_ACE_TYPE_ACCESS_DENIED)) {
1615 DEBUG(3,("create_canon_ace_lists: unable to set anything but an ALLOW or DENY ACE.\n"));
1616 return False;
1617 }
1618
1619 if (nt4_compatible_acls()) {
1620 /*
1621 * The security mask may be UNIX_ACCESS_NONE which should map into
1622 * no permissions (we overload the WRITE_OWNER bit for this) or it
1623 * should be one of the ALL/EXECUTE/READ/WRITE bits. Arrange for this
1624 * to be so. Any other bits override the UNIX_ACCESS_NONE bit.
1625 */
1626
1627 /*
1628 * Convert GENERIC bits to specific bits.
1629 */
1630
1631 se_map_generic(&psa->access_mask, &file_generic_mapping);
1632
1633 psa->access_mask &= (UNIX_ACCESS_NONE|FILE_ALL_ACCESS);
1634
1635 if(psa->access_mask != UNIX_ACCESS_NONE)
1636 psa->access_mask &= ~UNIX_ACCESS_NONE;
1637 }
1638 }
1639
1640 /*
1641 * Deal with the fact that NT 4.x re-writes the canonical format
1642 * that we return for default ACLs. If a directory ACE is identical
1643 * to a inherited directory ACE then NT changes the bits so that the
1644 * first ACE is set to OI|IO and the second ACE for this SID is set
1645 * to CI. We need to repair this. JRA.
1646 */
1647
1648 for(i = 0; i < dacl->num_aces; i++) {
1649 struct security_ace *psa1 = &dacl->aces[i];
1650
1651 for (j = i + 1; j < dacl->num_aces; j++) {
1652 struct security_ace *psa2 = &dacl->aces[j];
1653
1654 if (psa1->access_mask != psa2->access_mask)
1655 continue;
1656
1657 if (!dom_sid_equal(&psa1->trustee, &psa2->trustee))
1658 continue;
1659
1660 /*
1661 * Ok - permission bits and SIDs are equal.
1662 * Check if flags were re-written.
1663 */
1664
1665 if (psa1->flags & SEC_ACE_FLAG_INHERIT_ONLY) {
1666
1667 psa1->flags |= (psa2->flags & (SEC_ACE_FLAG_CONTAINER_INHERIT|SEC_ACE_FLAG_OBJECT_INHERIT));
1668 psa2->flags &= ~(SEC_ACE_FLAG_CONTAINER_INHERIT|SEC_ACE_FLAG_OBJECT_INHERIT);
1669
1670 } else if (psa2->flags & SEC_ACE_FLAG_INHERIT_ONLY) {
1671
1672 psa2->flags |= (psa1->flags & (SEC_ACE_FLAG_CONTAINER_INHERIT|SEC_ACE_FLAG_OBJECT_INHERIT));
1673 psa1->flags &= ~(SEC_ACE_FLAG_CONTAINER_INHERIT|SEC_ACE_FLAG_OBJECT_INHERIT);
1674
1675 }
1676 }
1677 }
1678
1679 for(i = 0; i < dacl->num_aces; i++) {
1680 struct security_ace *psa = &dacl->aces[i];
1681
1682 /*
1683 * Create a canon_ace entry representing this NT DACL ACE.
1684 */
1685
1686 if ((current_ace = SMB_MALLOC_P(canon_ace)) == NULL) {
1687 free_canon_ace_list(file_ace);
1688 free_canon_ace_list(dir_ace);
1689 DEBUG(0,("create_canon_ace_lists: malloc fail.\n"));
1690 return False;
1691 }
1692
1693 ZERO_STRUCTP(current_ace);
1694
1695 sid_copy(&current_ace->trustee, &psa->trustee);
1696
1697 /*
1698 * Try and work out if the SID is a user or group
1699 * as we need to flag these differently for POSIX.
1700 * Note what kind of a POSIX ACL this should map to.
1701 */
1702
1703 if( dom_sid_equal(&current_ace->trustee, &global_sid_World)) {
1704 current_ace->owner_type = WORLD_ACE;
1705 current_ace->unix_ug.world = -1;
1706 current_ace->type = SMB_ACL_OTHER;
1707 } else if (dom_sid_equal(&current_ace->trustee, &global_sid_Creator_Owner)) {
1708 current_ace->owner_type = UID_ACE;
1709 current_ace->unix_ug.uid = pst->st_ex_uid;
1710 current_ace->type = SMB_ACL_USER_OBJ;
1711
1712 /*
1713 * The Creator Owner entry only specifies inheritable permissions,
1714 * never access permissions. WinNT doesn't always set the ACE to
1715 * INHERIT_ONLY, though.
1716 */
1717
1718 psa->flags |= SEC_ACE_FLAG_INHERIT_ONLY;
1719
1720 } else if (dom_sid_equal(&current_ace->trustee, &global_sid_Creator_Group)) {
1721 current_ace->owner_type = GID_ACE;
1722 current_ace->unix_ug.gid = pst->st_ex_gid;
1723 current_ace->type = SMB_ACL_GROUP_OBJ;
1724
1725 /*
1726 * The Creator Group entry only specifies inheritable permissions,
1727 * never access permissions. WinNT doesn't always set the ACE to
1728 * INHERIT_ONLY, though.
1729 */
1730 psa->flags |= SEC_ACE_FLAG_INHERIT_ONLY;
1731
1732 } else if (sid_to_uid( &current_ace->trustee, &current_ace->unix_ug.uid)) {
1733 current_ace->owner_type = UID_ACE;
1734 /* If it's the owning user, this is a user_obj, not
1735 * a user. */
1736 if (current_ace->unix_ug.uid == pst->st_ex_uid) {
1737 current_ace->type = SMB_ACL_USER_OBJ;
1738 } else {
1739 current_ace->type = SMB_ACL_USER;
1740 }
1741 } else if (sid_to_gid( &current_ace->trustee, &current_ace->unix_ug.gid)) {
1742 current_ace->owner_type = GID_ACE;
1743 /* If it's the primary group, this is a group_obj, not
1744 * a group. */
1745 if (current_ace->unix_ug.gid == pst->st_ex_gid) {
1746 current_ace->type = SMB_ACL_GROUP_OBJ;
1747 } else {
1748 current_ace->type = SMB_ACL_GROUP;
1749 }
1750 } else {
1751 /*
1752 * Silently ignore map failures in non-mappable SIDs (NT Authority, BUILTIN etc).
1753 */
1754
1755 if (non_mappable_sid(&psa->trustee)) {
1756 DEBUG(10, ("create_canon_ace_lists: ignoring "
1757 "non-mappable SID %s\n",
1758 sid_string_dbg(&psa->trustee)));
1759 SAFE_FREE(current_ace);
1760 continue;
1761 }
1762
1763 if (lp_force_unknown_acl_user(SNUM(fsp->conn))) {
1764 DEBUG(10, ("create_canon_ace_lists: ignoring "
1765 "unknown or foreign SID %s\n",
1766 sid_string_dbg(&psa->trustee)));
1767 SAFE_FREE(current_ace);
1768 continue;
1769 }
1770
1771 free_canon_ace_list(file_ace);
1772 free_canon_ace_list(dir_ace);
1773 DEBUG(0, ("create_canon_ace_lists: unable to map SID "
1774 "%s to uid or gid.\n",
1775 sid_string_dbg(&current_ace->trustee)));
1776 SAFE_FREE(current_ace);
1777 return False;
1778 }
1779
1780 /*
1781 * Map the given NT permissions into a UNIX mode_t containing only
1782 * S_I(R|W|X)USR bits.
1783 */
1784
1785 current_ace->perms |= map_nt_perms( &psa->access_mask, S_IRUSR);
1786 current_ace->attr = (psa->type == SEC_ACE_TYPE_ACCESS_ALLOWED) ? ALLOW_ACE : DENY_ACE;
1787
1788 /* Store the ace_flag. */
1789 current_ace->ace_flags = psa->flags;
1790
1791 /*
1792 * Now add the created ace to either the file list, the directory
1793 * list, or both. We *MUST* preserve the order here (hence we use
1794 * DLIST_ADD_END) as NT ACLs are order dependent.
1795 */
1796
1797 if (fsp->is_directory) {
1798
1799 /*
1800 * We can only add to the default POSIX ACE list if the ACE is
1801 * designed to be inherited by both files and directories.
1802 */
1803
1804 if ((psa->flags & (SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT)) ==
1805 (SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT)) {
1806
1807 DLIST_ADD_END(dir_ace, current_ace, canon_ace *);
1808
1809 /*
1810 * Note if this was an allow ace. We can't process
1811 * any further deny ace's after this.
1812 */
1813
1814 if (current_ace->attr == ALLOW_ACE)
1815 got_dir_allow = True;
1816
1817 if ((current_ace->attr == DENY_ACE) && got_dir_allow) {
1818 DEBUG(0,("create_canon_ace_lists: "
1819 "malformed ACL in "
1820 "inheritable ACL! Deny entry "
1821 "after Allow entry. Failing "
1822 "to set on file %s.\n",
1823 fsp_str_dbg(fsp)));
1824 free_canon_ace_list(file_ace);
1825 free_canon_ace_list(dir_ace);
1826 return False;
1827 }
1828
1829 if( DEBUGLVL( 10 )) {
1830 dbgtext("create_canon_ace_lists: adding dir ACL:\n");
1831 print_canon_ace( current_ace, 0);
1832 }
1833
1834 /*
1835 * We have a lossy mapping: directory ACE entries
1836 * CREATOR_OWNER ------\
1837 * (map to) +---> SMB_ACL_USER_OBJ
1838 * owning sid ------/
1839 *
1840 * CREATOR_GROUP ------\
1841 * (map to) +---> SMB_ACL_GROUP_OBJ
1842 * primary group sid --/
1843 *
1844 * on set. And on read of a directory ACL
1845 *
1846 * SMB_ACL_USER_OBJ ----> CREATOR_OWNER
1847 * SMB_ACL_GROUP_OBJ ---> CREATOR_GROUP.
1848 *
1849 * Deal with this on set by duplicating
1850 * owning sid and primary group sid ACE
1851 * entries into the directory ACL.
1852 * Fix from Tsukasa Hamano <hamano@osstech.co.jp>.
1853 */
1854
1855 if (!dup_owning_ace(dir_ace, current_ace)) {
1856 DEBUG(0,("create_canon_ace_lists: malloc fail !\n"));
1857 free_canon_ace_list(file_ace);
1858 free_canon_ace_list(dir_ace);
1859 return false;
1860 }
1861
1862 /*
1863 * If this is not an inherit only ACE we need to add a duplicate
1864 * to the file acl.
1865 */
1866
1867 if (!(psa->flags & SEC_ACE_FLAG_INHERIT_ONLY)) {
1868 canon_ace *dup_ace = dup_canon_ace(current_ace);
1869
1870 if (!dup_ace) {
1871 DEBUG(0,("create_canon_ace_lists: malloc fail !\n"));
1872 free_canon_ace_list(file_ace);
1873 free_canon_ace_list(dir_ace);
1874 return False;
1875 }
1876
1877 /*
1878 * We must not free current_ace here as its
1879 * pointer is now owned by the dir_ace list.
1880 */
1881 current_ace = dup_ace;
1882 /* We've essentially split this ace into two,
1883 * and added the ace with inheritance request
1884 * bits to the directory ACL. Drop those bits for
1885 * the ACE we're adding to the file list. */
1886 current_ace->ace_flags &= ~(SEC_ACE_FLAG_OBJECT_INHERIT|
1887 SEC_ACE_FLAG_CONTAINER_INHERIT|
1888 SEC_ACE_FLAG_INHERIT_ONLY);
1889 } else {
1890 /*
1891 * We must not free current_ace here as its
1892 * pointer is now owned by the dir_ace list.
1893 */
1894 current_ace = NULL;
1895 }
1896 }
1897 }
1898
1899 /*
1900 * Only add to the file ACL if not inherit only.
1901 */
1902
1903 if (current_ace && !(psa->flags & SEC_ACE_FLAG_INHERIT_ONLY)) {
1904 DLIST_ADD_END(file_ace, current_ace, canon_ace *);
1905
1906 /*
1907 * Note if this was an allow ace. We can't process
1908 * any further deny ace's after this.
1909 */
1910
1911 if (current_ace->attr == ALLOW_ACE)
1912 got_file_allow = True;
1913
1914 if ((current_ace->attr == DENY_ACE) && got_file_allow) {
1915 DEBUG(0,("create_canon_ace_lists: malformed "
1916 "ACL in file ACL ! Deny entry after "
1917 "Allow entry. Failing to set on file "
1918 "%s.\n", fsp_str_dbg(fsp)));
1919 free_canon_ace_list(file_ace);
1920 free_canon_ace_list(dir_ace);
1921 return False;
1922 }
1923
1924 if( DEBUGLVL( 10 )) {
1925 dbgtext("create_canon_ace_lists: adding file ACL:\n");
1926 print_canon_ace( current_ace, 0);
1927 }
1928 all_aces_are_inherit_only = False;
1929 /*
1930 * We must not free current_ace here as its
1931 * pointer is now owned by the file_ace list.
1932 */
1933 current_ace = NULL;
1934 }
1935
1936 /*
1937 * Free if ACE was not added.
1938 */
1939
1940 SAFE_FREE(current_ace);
1941 }
1942
1943 if (fsp->is_directory && all_aces_are_inherit_only) {
1944 /*
1945 * Windows 2000 is doing one of these weird 'inherit acl'
1946 * traverses to conserve NTFS ACL resources. Just pretend
1947 * there was no DACL sent. JRA.
1948 */
1949
1950 DEBUG(10,("create_canon_ace_lists: Win2k inherit acl traverse. Ignoring DACL.\n"));
1951 free_canon_ace_list(file_ace);
1952 free_canon_ace_list(dir_ace);
1953 file_ace = NULL;
1954 dir_ace = NULL;
1955 } else {
1956 /*
1957 * Check if we have SMB_ACL_USER_OBJ and SMB_ACL_GROUP_OBJ entries in each
1958 * ACL. If we don't have them, check if any SMB_ACL_USER/SMB_ACL_GROUP
1959 * entries can be converted to *_OBJ. Usually we will already have these
1960 * entries in the Default ACL, and the Access ACL will not have them.
1961 */
1962 if (file_ace) {
1963 check_owning_objs(file_ace, pfile_owner_sid, pfile_grp_sid);
1964 }
1965 if (dir_ace) {
1966 check_owning_objs(dir_ace, pfile_owner_sid, pfile_grp_sid);
1967 }
1968 }
1969
1970 *ppfile_ace = file_ace;
1971 *ppdir_ace = dir_ace;
1972
1973 return True;
1974 }
1975
1976 /****************************************************************************
1977 ASCII art time again... JRA :-).
1978
1979 We have 4 cases to process when moving from an NT ACL to a POSIX ACL. Firstly,
1980 we insist the ACL is in canonical form (ie. all DENY entries preceede ALLOW
1981 entries). Secondly, the merge code has ensured that all duplicate SID entries for
1982 allow or deny have been merged, so the same SID can only appear once in the deny
1983 list or once in the allow list.
1984
1985 We then process as follows :
1986
1987 ---------------------------------------------------------------------------
1988 First pass - look for a Everyone DENY entry.
1989
1990 If it is deny all (rwx) trunate the list at this point.
1991 Else, walk the list from this point and use the deny permissions of this
1992 entry as a mask on all following allow entries. Finally, delete
1993 the Everyone DENY entry (we have applied it to everything possible).
1994
1995 In addition, in this pass we remove any DENY entries that have
1996 no permissions (ie. they are a DENY nothing).
1997 ---------------------------------------------------------------------------
1998 Second pass - only deal with deny user entries.
1999
2000 DENY user1 (perms XXX)
2001
2002 new_perms = 0
2003 for all following allow group entries where user1 is in group
2004 new_perms |= group_perms;
2005
2006 user1 entry perms = new_perms & ~ XXX;
2007
2008 Convert the deny entry to an allow entry with the new perms and
2009 push to the end of the list. Note if the user was in no groups
2010 this maps to a specific allow nothing entry for this user.
2011
2012 The common case from the NT ACL choser (userX deny all) is
2013 optimised so we don't do the group lookup - we just map to
2014 an allow nothing entry.
2015
2016 What we're doing here is inferring the allow permissions the
2017 person setting the ACE on user1 wanted by looking at the allow
2018 permissions on the groups the user is currently in. This will
2019 be a snapshot, depending on group membership but is the best
2020 we can do and has the advantage of failing closed rather than
2021 open.
2022 ---------------------------------------------------------------------------
2023 Third pass - only deal with deny group entries.
2024
2025 DENY group1 (perms XXX)
2026
2027 for all following allow user entries where user is in group1
2028 user entry perms = user entry perms & ~ XXX;
2029
2030 If there is a group Everyone allow entry with permissions YYY,
2031 convert the group1 entry to an allow entry and modify its
2032 permissions to be :
2033
2034 new_perms = YYY & ~ XXX
2035
2036 and push to the end of the list.
2037
2038 If there is no group Everyone allow entry then convert the
2039 group1 entry to a allow nothing entry and push to the end of the list.
2040
2041 Note that the common case from the NT ACL choser (groupX deny all)
2042 cannot be optimised here as we need to modify user entries who are
2043 in the group to change them to a deny all also.
2044
2045 What we're doing here is modifying the allow permissions of
2046 user entries (which are more specific in POSIX ACLs) to mask
2047 out the explicit deny set on the group they are in. This will
2048 be a snapshot depending on current group membership but is the
2049 best we can do and has the advantage of failing closed rather
2050 than open.
2051 ---------------------------------------------------------------------------
2052 Fourth pass - cope with cumulative permissions.
2053
2054 for all allow user entries, if there exists an allow group entry with
2055 more permissive permissions, and the user is in that group, rewrite the
2056 allow user permissions to contain both sets of permissions.
2057
2058 Currently the code for this is #ifdef'ed out as these semantics make
2059 no sense to me. JRA.
2060 ---------------------------------------------------------------------------
2061
2062 Note we *MUST* do the deny user pass first as this will convert deny user
2063 entries into allow user entries which can then be processed by the deny
2064 group pass.
2065
2066 The above algorithm took a *lot* of thinking about - hence this
2067 explaination :-). JRA.
2068 ****************************************************************************/
2069
2070 /****************************************************************************
2071 Process a canon_ace list entries. This is very complex code. We need
2072 to go through and remove the "deny" permissions from any allow entry that matches
2073 the id of this entry. We have already refused any NT ACL that wasn't in correct
2074 order (DENY followed by ALLOW). If any allow entry ends up with zero permissions,
2075 we just remove it (to fail safe). We have already removed any duplicate ace
2076 entries. Treat an "Everyone" DENY_ACE as a special case - use it to mask all
2077 allow entries.
2078 ****************************************************************************/
2079
2080 static void process_deny_list(connection_struct *conn, canon_ace **pp_ace_list )
2081 {
2082 canon_ace *ace_list = *pp_ace_list;
2083 canon_ace *curr_ace = NULL;
2084 canon_ace *curr_ace_next = NULL;
2085
2086 /* Pass 1 above - look for an Everyone, deny entry. */
2087
2088 for (curr_ace = ace_list; curr_ace; curr_ace = curr_ace_next) {
2089 canon_ace *allow_ace_p;
2090
2091 curr_ace_next = curr_ace->next; /* So we can't lose the link. */
2092
2093 if (curr_ace->attr != DENY_ACE)
2094 continue;
2095
2096 if (curr_ace->perms == (mode_t)0) {
2097
2098 /* Deny nothing entry - delete. */
2099
2100 DLIST_REMOVE(ace_list, curr_ace);
2101 continue;
2102 }
2103
2104 if (!dom_sid_equal(&curr_ace->trustee, &global_sid_World))
2105 continue;
2106
2107 /* JRATEST - assert. */
2108 SMB_ASSERT(curr_ace->owner_type == WORLD_ACE);
2109
2110 if (curr_ace->perms == ALL_ACE_PERMS) {
2111
2112 /*
2113 * Optimisation. This is a DENY_ALL to Everyone. Truncate the
2114 * list at this point including this entry.
2115 */
2116
2117 canon_ace *prev_entry = DLIST_PREV(curr_ace);
2118
2119 free_canon_ace_list( curr_ace );
2120 if (prev_entry)
2121 DLIST_REMOVE(ace_list, prev_entry);
2122 else {
2123 /* We deleted the entire list. */
2124 ace_list = NULL;
2125 }
2126 break;
2127 }
2128
2129 for (allow_ace_p = curr_ace->next; allow_ace_p; allow_ace_p = allow_ace_p->next) {
2130
2131 /*
2132 * Only mask off allow entries.
2133 */
2134
2135 if (allow_ace_p->attr != ALLOW_ACE)
2136 continue;
2137
2138 allow_ace_p->perms &= ~curr_ace->perms;
2139 }
2140
2141 /*
2142 * Now it's been applied, remove it.
2143 */
2144
2145 DLIST_REMOVE(ace_list, curr_ace);
2146 }
2147
2148 /* Pass 2 above - deal with deny user entries. */
2149
2150 for (curr_ace = ace_list; curr_ace; curr_ace = curr_ace_next) {
2151 mode_t new_perms = (mode_t)0;
2152 canon_ace *allow_ace_p;
2153
2154 curr_ace_next = curr_ace->next; /* So we can't lose the link. */
2155
2156 if (curr_ace->attr != DENY_ACE)
2157 continue;
2158
2159 if (curr_ace->owner_type != UID_ACE)
2160 continue;
2161
2162 if (curr_ace->perms == ALL_ACE_PERMS) {
2163
2164 /*
2165 * Optimisation - this is a deny everything to this user.
2166 * Convert to an allow nothing and push to the end of the list.
2167 */
2168
2169 curr_ace->attr = ALLOW_ACE;
2170 curr_ace->perms = (mode_t)0;
2171 DLIST_DEMOTE(ace_list, curr_ace, canon_ace *);
2172 continue;
2173 }
2174
2175 for (allow_ace_p = curr_ace->next; allow_ace_p; allow_ace_p = allow_ace_p->next) {
2176
2177 if (allow_ace_p->attr != ALLOW_ACE)
2178 continue;
2179
2180 /* We process GID_ACE and WORLD_ACE entries only. */
2181
2182 if (allow_ace_p->owner_type == UID_ACE)
2183 continue;
2184
2185 if (uid_entry_in_group(conn, curr_ace, allow_ace_p))
2186 new_perms |= allow_ace_p->perms;
2187 }
2188
2189 /*
2190 * Convert to a allow entry, modify the perms and push to the end
2191 * of the list.
2192 */
2193
2194 curr_ace->attr = ALLOW_ACE;
2195 curr_ace->perms = (new_perms & ~curr_ace->perms);
2196 DLIST_DEMOTE(ace_list, curr_ace, canon_ace *);
2197 }
2198
2199 /* Pass 3 above - deal with deny group entries. */
2200
2201 for (curr_ace = ace_list; curr_ace; curr_ace = curr_ace_next) {
2202 canon_ace *allow_ace_p;
2203 canon_ace *allow_everyone_p = NULL;
2204
2205 curr_ace_next = curr_ace->next; /* So we can't lose the link. */
2206
2207 if (curr_ace->attr != DENY_ACE)
2208 continue;
2209
2210 if (curr_ace->owner_type != GID_ACE)
2211 continue;
2212
2213 for (allow_ace_p = curr_ace->next; allow_ace_p; allow_ace_p = allow_ace_p->next) {
2214
2215 if (allow_ace_p->attr != ALLOW_ACE)
2216 continue;
2217
2218 /* Store a pointer to the Everyone allow, if it exists. */
2219 if (allow_ace_p->owner_type == WORLD_ACE)
2220 allow_everyone_p = allow_ace_p;
2221
2222 /* We process UID_ACE entries only. */
2223
2224 if (allow_ace_p->owner_type != UID_ACE)
2225 continue;
2226
2227 /* Mask off the deny group perms. */
2228
2229 if (uid_entry_in_group(conn, allow_ace_p, curr_ace))
2230 allow_ace_p->perms &= ~curr_ace->perms;
2231 }
2232
2233 /*
2234 * Convert the deny to an allow with the correct perms and
2235 * push to the end of the list.
2236 */
2237
2238 curr_ace->attr = ALLOW_ACE;
2239 if (allow_everyone_p)
2240 curr_ace->perms = allow_everyone_p->perms & ~curr_ace->perms;
2241 else
2242 curr_ace->perms = (mode_t)0;
2243 DLIST_DEMOTE(ace_list, curr_ace, canon_ace *);
2244 }
2245
2246 /* Doing this fourth pass allows Windows semantics to be layered
2247 * on top of POSIX semantics. I'm not sure if this is desirable.
2248 * For example, in W2K ACLs there is no way to say, "Group X no
2249 * access, user Y full access" if user Y is a member of group X.
2250 * This seems completely broken semantics to me.... JRA.
2251 */
2252
2253 #if 0
2254 /* Pass 4 above - deal with allow entries. */
2255
2256 for (curr_ace = ace_list; curr_ace; curr_ace = curr_ace_next) {
2257 canon_ace *allow_ace_p;
2258
2259 curr_ace_next = curr_ace->next; /* So we can't lose the link. */
2260
2261 if (curr_ace->attr != ALLOW_ACE)
2262 continue;
2263
2264 if (curr_ace->owner_type != UID_ACE)
2265 continue;
2266
2267 for (allow_ace_p = ace_list; allow_ace_p; allow_ace_p = allow_ace_p->next) {
2268
2269 if (allow_ace_p->attr != ALLOW_ACE)
2270 continue;
2271
2272 /* We process GID_ACE entries only. */
2273
2274 if (allow_ace_p->owner_type != GID_ACE)
2275 continue;
2276
2277 /* OR in the group perms. */
2278
2279 if (uid_entry_in_group(conn, curr_ace, allow_ace_p))
2280 curr_ace->perms |= allow_ace_p->perms;
2281 }
2282 }
2283 #endif
2284
2285 *pp_ace_list = ace_list;
2286 }
2287
2288 /****************************************************************************
2289 Create a default mode that will be used if a security descriptor entry has
2290 no user/group/world entries.
2291 ****************************************************************************/
2292
2293 static mode_t create_default_mode(files_struct *fsp, bool interitable_mode)
2294 {
2295 int snum = SNUM(fsp->conn);
2296 mode_t and_bits = (mode_t)0;
2297 mode_t or_bits = (mode_t)0;
2298 mode_t mode;
2299
2300 if (interitable_mode) {
2301 mode = unix_mode(fsp->conn, FILE_ATTRIBUTE_ARCHIVE,
2302 fsp->fsp_name, NULL);
2303 } else {
2304 mode = S_IRUSR;
2305 }
2306
2307 if (fsp->is_directory)
2308 mode |= (S_IWUSR|S_IXUSR);
2309
2310 /*
2311 * Now AND with the create mode/directory mode bits then OR with the
2312 * force create mode/force directory mode bits.
2313 */
2314
2315 if (fsp->is_directory) {
2316 and_bits = lp_dir_security_mask(snum);
2317 or_bits = lp_force_dir_security_mode(snum);
2318 } else {
2319 and_bits = lp_security_mask(snum);
2320 or_bits = lp_force_security_mode(snum);
2321 }
2322
2323 return ((mode & and_bits)|or_bits);
2324 }
2325
2326 /****************************************************************************
2327 Unpack a struct security_descriptor into two canonical ace lists. We don't depend on this
2328 succeeding.
2329 ****************************************************************************/
2330
2331 static bool unpack_canon_ace(files_struct *fsp,
2332 const SMB_STRUCT_STAT *pst,
2333 struct dom_sid *pfile_owner_sid,
2334 struct dom_sid *pfile_grp_sid,
2335 canon_ace **ppfile_ace,
2336 canon_ace **ppdir_ace,
2337 uint32 security_info_sent,
2338 const struct security_descriptor *psd)
2339 {
2340 SMB_STRUCT_STAT st;
2341 canon_ace *file_ace = NULL;
2342 canon_ace *dir_ace = NULL;
2343
2344 *ppfile_ace = NULL;
2345 *ppdir_ace = NULL;
2346
2347 if(security_info_sent == 0) {
2348 DEBUG(0,("unpack_canon_ace: no security info sent !\n"));
2349 return False;
2350 }
2351
2352 /*
2353 * If no DACL then this is a chown only security descriptor.
2354 */
2355
2356 if(!(security_info_sent & SECINFO_DACL) || !psd->dacl)
2357 return True;
2358
2359 /*
2360 * Now go through the DACL and create the canon_ace lists.
2361 */
2362
2363 if (!create_canon_ace_lists( fsp, pst, pfile_owner_sid, pfile_grp_sid,
2364 &file_ace, &dir_ace, psd->dacl))
2365 return False;
2366
2367 if ((file_ace == NULL) && (dir_ace == NULL)) {
2368 /* W2K traverse DACL set - ignore. */
2369 return True;
2370 }
2371
2372 /*
2373 * Go through the canon_ace list and merge entries
2374 * belonging to identical users of identical allow or deny type.
2375 * We can do this as all deny entries come first, followed by
2376 * all allow entries (we have mandated this before accepting this acl).
2377 */
2378
2379 print_canon_ace_list( "file ace - before merge", file_ace);
2380 merge_aces( &file_ace, false);
2381
2382 print_canon_ace_list( "dir ace - before merge", dir_ace);
2383 merge_aces( &dir_ace, true);
2384
2385 /*
2386 * NT ACLs are order dependent. Go through the acl lists and
2387 * process DENY entries by masking the allow entries.
2388 */
2389
2390 print_canon_ace_list( "file ace - before deny", file_ace);
2391 process_deny_list(fsp->conn, &file_ace);
2392
2393 print_canon_ace_list( "dir ace - before deny", dir_ace);
2394 process_deny_list(fsp->conn, &dir_ace);
2395
2396 /*
2397 * A well formed POSIX file or default ACL has at least 3 entries, a
2398 * SMB_ACL_USER_OBJ, SMB_ACL_GROUP_OBJ, SMB_ACL_OTHER_OBJ
2399 * and optionally a mask entry. Ensure this is the case.
2400 */
2401
2402 print_canon_ace_list( "file ace - before valid", file_ace);
2403
2404 st = *pst;
2405
2406 /*
2407 * A default 3 element mode entry for a file should be r-- --- ---.
2408 * A default 3 element mode entry for a directory should be rwx --- ---.
2409 */
2410
2411 st.st_ex_mode = create_default_mode(fsp, False);
2412
2413 if (!ensure_canon_entry_valid(fsp->conn, &file_ace, fsp->conn->params,
2414 fsp->is_directory, pfile_owner_sid, pfile_grp_sid, &st, True)) {
2415 free_canon_ace_list(file_ace);
2416 free_canon_ace_list(dir_ace);
2417 return False;
2418 }
2419
2420 print_canon_ace_list( "dir ace - before valid", dir_ace);
2421
2422 /*
2423 * A default inheritable 3 element mode entry for a directory should be the
2424 * mode Samba will use to create a file within. Ensure user rwx bits are set if
2425 * it's a directory.
2426 */
2427
2428 st.st_ex_mode = create_default_mode(fsp, True);
2429
2430 if (dir_ace && !ensure_canon_entry_valid(fsp->conn, &dir_ace, fsp->conn->params,
2431 fsp->is_directory, pfile_owner_sid, pfile_grp_sid, &st, True)) {
2432 free_canon_ace_list(file_ace);
2433 free_canon_ace_list(dir_ace);
2434 return False;
2435 }
2436
2437 print_canon_ace_list( "file ace - return", file_ace);
2438 print_canon_ace_list( "dir ace - return", dir_ace);
2439
2440 *ppfile_ace = file_ace;
2441 *ppdir_ace = dir_ace;
2442 return True;
2443
2444 }
2445
2446 /******************************************************************************
2447 When returning permissions, try and fit NT display
2448 semantics if possible. Note the the canon_entries here must have been malloced.
2449 The list format should be - first entry = owner, followed by group and other user
2450 entries, last entry = other.
2451
2452 Note that this doesn't exactly match the NT semantics for an ACL. As POSIX entries
2453 are not ordered, and match on the most specific entry rather than walking a list,
2454 then a simple POSIX permission of rw-r--r-- should really map to 5 entries,
2455
2456 Entry 0: owner : deny all except read and write.
2457 Entry 1: owner : allow read and write.
2458 Entry 2: group : deny all except read.
2459 Entry 3: group : allow read.
2460 Entry 4: Everyone : allow read.
2461
2462 But NT cannot display this in their ACL editor !
2463 ********************************************************************************/
2464
2465 static void arrange_posix_perms(const char *filename, canon_ace **pp_list_head)
2466 {
2467 canon_ace *l_head = *pp_list_head;
2468 canon_ace *owner_ace = NULL;
2469 canon_ace *other_ace = NULL;
2470 canon_ace *ace = NULL;
2471
2472 for (ace = l_head; ace; ace = ace->next) {
2473 if (ace->type == SMB_ACL_USER_OBJ)
2474 owner_ace = ace;
2475 else if (ace->type == SMB_ACL_OTHER) {
2476 /* Last ace - this is "other" */
2477 other_ace = ace;
2478 }
2479 }
2480
2481 if (!owner_ace || !other_ace) {
2482 DEBUG(0,("arrange_posix_perms: Invalid POSIX permissions for file %s, missing owner or other.\n",
2483 filename ));
2484 return;
2485 }
2486
2487 /*
2488 * The POSIX algorithm applies to owner first, and other last,
2489 * so ensure they are arranged in this order.
2490 */
2491
2492 if (owner_ace) {
2493 DLIST_PROMOTE(l_head, owner_ace);
2494 }
2495
2496 if (other_ace) {
2497 DLIST_DEMOTE(l_head, other_ace, canon_ace *);
2498 }
2499
2500 /* We have probably changed the head of the list. */
2501
2502 *pp_list_head = l_head;
2503 }
2504
2505 /****************************************************************************
2506 Create a linked list of canonical ACE entries.
2507 ****************************************************************************/
2508
2509 static canon_ace *canonicalise_acl(struct connection_struct *conn,
2510 const char *fname, SMB_ACL_T posix_acl,
2511 const SMB_STRUCT_STAT *psbuf,
2512 const struct dom_sid *powner, const struct dom_sid *pgroup, struct pai_val *pal, SMB_ACL_TYPE_T the_acl_type)
2513 {
2514 mode_t acl_mask = (S_IRUSR|S_IWUSR|S_IXUSR);
2515 canon_ace *l_head = NULL;
2516 canon_ace *ace = NULL;
2517 canon_ace *next_ace = NULL;
2518 int entry_id = SMB_ACL_FIRST_ENTRY;
2519 SMB_ACL_ENTRY_T entry;
2520 size_t ace_count;
2521
2522 while ( posix_acl && (SMB_VFS_SYS_ACL_GET_ENTRY(conn, posix_acl, entry_id, &entry) == 1)) {
2523 SMB_ACL_TAG_T tagtype;
2524 SMB_ACL_PERMSET_T permset;
2525 struct dom_sid sid;
2526 posix_id unix_ug;
2527 enum ace_owner owner_type;
2528
2529 entry_id = SMB_ACL_NEXT_ENTRY;
2530
2531 /* Is this a MASK entry ? */
2532 if (SMB_VFS_SYS_ACL_GET_TAG_TYPE(conn, entry, &tagtype) == -1)
2533 continue;
2534
2535 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, entry, &permset) == -1)
2536 continue;
2537
2538 /* Decide which SID to use based on the ACL type. */
2539 switch(tagtype) {
2540 case SMB_ACL_USER_OBJ:
2541 /* Get the SID from the owner. */
2542 sid_copy(&sid, powner);
2543 unix_ug.uid = psbuf->st_ex_uid;
2544 owner_type = UID_ACE;
2545 break;
2546 case SMB_ACL_USER:
2547 {
2548 uid_t *puid = (uid_t *)SMB_VFS_SYS_ACL_GET_QUALIFIER(conn, entry);
2549 if (puid == NULL) {
2550 DEBUG(0,("canonicalise_acl: Failed to get uid.\n"));
2551 continue;
2552 }
2553 uid_to_sid( &sid, *puid);
2554 unix_ug.uid = *puid;
2555 owner_type = UID_ACE;
2556 SMB_VFS_SYS_ACL_FREE_QUALIFIER(conn, (void *)puid,tagtype);
2557 break;
2558 }
2559 case SMB_ACL_GROUP_OBJ:
2560 /* Get the SID from the owning group. */
2561 sid_copy(&sid, pgroup);
2562 unix_ug.gid = psbuf->st_ex_gid;
2563 owner_type = GID_ACE;
2564 break;
2565 case SMB_ACL_GROUP:
2566 {
2567 gid_t *pgid = (gid_t *)SMB_VFS_SYS_ACL_GET_QUALIFIER(conn, entry);
2568 if (pgid == NULL) {
2569 DEBUG(0,("canonicalise_acl: Failed to get gid.\n"));
2570 continue;
2571 }
2572 gid_to_sid( &sid, *pgid);
2573 unix_ug.gid = *pgid;
2574 owner_type = GID_ACE;
2575 SMB_VFS_SYS_ACL_FREE_QUALIFIER(conn, (void *)pgid,tagtype);
2576 break;
2577 }
2578 case SMB_ACL_MASK:
2579 acl_mask = convert_permset_to_mode_t(conn, permset);
2580 continue; /* Don't count the mask as an entry. */
2581 case SMB_ACL_OTHER:
2582 /* Use the Everyone SID */
2583 sid = global_sid_World;
2584 unix_ug.world = -1;
2585 owner_type = WORLD_ACE;
2586 break;
2587 default:
2588 DEBUG(0,("canonicalise_acl: Unknown tagtype %u\n", (unsigned int)tagtype));
2589 continue;
2590 }
2591
2592 /*
2593 * Add this entry to the list.
2594 */
2595
2596 if ((ace = SMB_MALLOC_P(canon_ace)) == NULL)
2597 goto fail;
2598
2599 ZERO_STRUCTP(ace);
2600 ace->type = tagtype;
2601 ace->perms = convert_permset_to_mode_t(conn, permset);
2602 ace->attr = ALLOW_ACE;
2603 ace->trustee = sid;
2604 ace->unix_ug = unix_ug;
2605 ace->owner_type = owner_type;
2606 ace->ace_flags = get_pai_flags(pal, ace, (the_acl_type == SMB_ACL_TYPE_DEFAULT));
2607
2608 DLIST_ADD(l_head, ace);
2609 }
2610
2611 /*
2612 * This next call will ensure we have at least a user/group/world set.
2613 */
2614
2615 if (!ensure_canon_entry_valid(conn, &l_head, conn->params,
2616 S_ISDIR(psbuf->st_ex_mode), powner, pgroup,
2617 psbuf, False))
2618 goto fail;
2619
2620 /*
2621 * Now go through the list, masking the permissions with the
2622 * acl_mask. Ensure all DENY Entries are at the start of the list.
2623 */
2624
2625 DEBUG(10,("canonicalise_acl: %s ace entries before arrange :\n", the_acl_type == SMB_ACL_TYPE_ACCESS ? "Access" : "Default" ));
2626
2627 for ( ace_count = 0, ace = l_head; ace; ace = next_ace, ace_count++) {
2628 next_ace = ace->next;
2629
2630 /* Masks are only applied to entries other than USER_OBJ and OTHER. */
2631 if (ace->type != SMB_ACL_OTHER && ace->type != SMB_ACL_USER_OBJ)
2632 ace->perms &= acl_mask;
2633
2634 if (ace->perms == 0) {
2635 DLIST_PROMOTE(l_head, ace);
2636 }
2637
2638 if( DEBUGLVL( 10 ) ) {
2639 print_canon_ace(ace, ace_count);
2640 }
2641 }
2642
2643 arrange_posix_perms(fname,&l_head );
2644
2645 print_canon_ace_list( "canonicalise_acl: ace entries after arrange", l_head );
2646
2647 return l_head;
2648
2649 fail:
2650
2651 free_canon_ace_list(l_head);
2652 return NULL;
2653 }
2654
2655 /****************************************************************************
2656 Check if the current user group list contains a given group.
2657 ****************************************************************************/
2658
2659 bool current_user_in_group(connection_struct *conn, gid_t gid)
2660 {
2661 int i;
2662 const struct security_unix_token *utok = get_current_utok(conn);
2663
2664 for (i = 0; i < utok->ngroups; i++) {
2665 if (utok->groups[i] == gid) {
2666 return True;
2667 }
2668 }
2669
2670 return False;
2671 }
2672
2673 /****************************************************************************
2674 Should we override a deny ? Check 'acl group control' and 'dos filemode'.
2675 ****************************************************************************/
2676
2677 static bool acl_group_override(connection_struct *conn,
2678 const struct smb_filename *smb_fname)
2679 {
2680 if ((errno != EPERM) && (errno != EACCES)) {
2681 return false;
2682 }
2683
2684 /* file primary group == user primary or supplementary group */
2685 if (lp_acl_group_control(SNUM(conn)) &&
2686 current_user_in_group(conn, smb_fname->st.st_ex_gid)) {
2687 return true;
2688 }
2689
2690 /* user has writeable permission */
2691 if (lp_dos_filemode(SNUM(conn)) &&
2692 can_write_to_file(conn, smb_fname)) {
2693 return true;
2694 }
2695
2696 return false;
2697 }
2698
2699 /****************************************************************************
2700 Attempt to apply an ACL to a file or directory.
2701 ****************************************************************************/
2702
2703 static bool set_canon_ace_list(files_struct *fsp,
2704 canon_ace *the_ace,
2705 bool default_ace,
2706 const SMB_STRUCT_STAT *psbuf,
2707 bool *pacl_set_support)
2708 {
2709 connection_struct *conn = fsp->conn;
2710 bool ret = False;
2711 SMB_ACL_T the_acl = SMB_VFS_SYS_ACL_INIT(conn, (int)count_canon_ace_list(the_ace) + 1);
2712 canon_ace *p_ace;
2713 int i;
2714 SMB_ACL_ENTRY_T mask_entry;
2715 bool got_mask_entry = False;
2716 SMB_ACL_PERMSET_T mask_permset;
2717 SMB_ACL_TYPE_T the_acl_type = (default_ace ? SMB_ACL_TYPE_DEFAULT : SMB_ACL_TYPE_ACCESS);
2718 bool needs_mask = False;
2719 mode_t mask_perms = 0;
2720
2721 /* Use the psbuf that was passed in. */
2722 if (psbuf != &fsp->fsp_name->st) {
2723 fsp->fsp_name->st = *psbuf;
2724 }
2725
2726 #if defined(POSIX_ACL_NEEDS_MASK)
2727 /* HP-UX always wants to have a mask (called "class" there). */
2728 needs_mask = True;
2729 #endif
2730
2731 if (the_acl == NULL) {
2732
2733 if (!no_acl_syscall_error(errno)) {
2734 /*
2735 * Only print this error message if we have some kind of ACL
2736 * support that's not working. Otherwise we would always get this.
2737 */
2738 DEBUG(0,("set_canon_ace_list: Unable to init %s ACL. (%s)\n",
2739 default_ace ? "default" : "file", strerror(errno) ));
2740 }
2741 *pacl_set_support = False;
2742 goto fail;
2743 }
2744
2745 if( DEBUGLVL( 10 )) {
2746 dbgtext("set_canon_ace_list: setting ACL:\n");
2747 for (i = 0, p_ace = the_ace; p_ace; p_ace = p_ace->next, i++ ) {
2748 print_canon_ace( p_ace, i);
2749 }
2750 }
2751
2752 for (i = 0, p_ace = the_ace; p_ace; p_ace = p_ace->next, i++ ) {
2753 SMB_ACL_ENTRY_T the_entry;
2754 SMB_ACL_PERMSET_T the_permset;
2755
2756 /*
2757 * ACLs only "need" an ACL_MASK entry if there are any named user or
2758 * named group entries. But if there is an ACL_MASK entry, it applies
2759 * to ACL_USER, ACL_GROUP, and ACL_GROUP_OBJ entries. Set the mask
2760 * so that it doesn't deny (i.e., mask off) any permissions.
2761 */
2762
2763 if (p_ace->type == SMB_ACL_USER || p_ace->type == SMB_ACL_GROUP) {
2764 needs_mask = True;
2765 mask_perms |= p_ace->perms;
2766 } else if (p_ace->type == SMB_ACL_GROUP_OBJ) {
2767 mask_perms |= p_ace->perms;
2768 }
2769
2770 /*
2771 * Get the entry for this ACE.
2772 */
2773
2774 if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &the_acl, &the_entry) == -1) {
2775 DEBUG(0,("set_canon_ace_list: Failed to create entry %d. (%s)\n",
2776 i, strerror(errno) ));
2777 goto fail;
2778 }
2779
2780 if (p_ace->type == SMB_ACL_MASK) {
2781 mask_entry = the_entry;
2782 got_mask_entry = True;
2783 }
2784
2785 /*
2786 * Ok - we now know the ACL calls should be working, don't
2787 * allow fallback to chmod.
2788 */
2789
2790 *pacl_set_support = True;
2791
2792 /*
2793 * Initialise the entry from the canon_ace.
2794 */
2795
2796 /*
2797 * First tell the entry what type of ACE this is.
2798 */
2799
2800 if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, the_entry, p_ace->type) == -1) {
2801 DEBUG(0,("set_canon_ace_list: Failed to set tag type on entry %d. (%s)\n",
2802 i, strerror(errno) ));
2803 goto fail;
2804 }
2805
2806 /*
2807 * Only set the qualifier (user or group id) if the entry is a user
2808 * or group id ACE.
2809 */
2810
2811 if ((p_ace->type == SMB_ACL_USER) || (p_ace->type == SMB_ACL_GROUP)) {
2812 if (SMB_VFS_SYS_ACL_SET_QUALIFIER(conn, the_entry,(void *)&p_ace->unix_ug.uid) == -1) {
2813 DEBUG(0,("set_canon_ace_list: Failed to set qualifier on entry %d. (%s)\n",
2814 i, strerror(errno) ));
2815 goto fail;
2816 }
2817 }
2818
2819 /*
2820 * Convert the mode_t perms in the canon_ace to a POSIX permset.
2821 */
2822
2823 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, the_entry, &the_permset) == -1) {
2824 DEBUG(0,("set_canon_ace_list: Failed to get permset on entry %d. (%s)\n",
2825 i, strerror(errno) ));
2826 goto fail;
2827 }
2828
2829 if (map_acl_perms_to_permset(conn, p_ace->perms, &the_permset) == -1) {
2830 DEBUG(0,("set_canon_ace_list: Failed to create permset for mode (%u) on entry %d. (%s)\n",
2831 (unsigned int)p_ace->perms, i, strerror(errno) ));
2832 goto fail;
2833 }
2834
2835 /*
2836 * ..and apply them to the entry.
2837 */
2838
2839 if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, the_entry, the_permset) == -1) {
2840 DEBUG(0,("set_canon_ace_list: Failed to add permset on entry %d. (%s)\n",
2841 i, strerror(errno) ));
2842 goto fail;
2843 }
2844
2845 if( DEBUGLVL( 10 ))
2846 print_canon_ace( p_ace, i);
2847
2848 }
2849
2850 if (needs_mask && !got_mask_entry) {
2851 if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &the_acl, &mask_entry) == -1) {
2852 DEBUG(0,("set_canon_ace_list: Failed to create mask entry. (%s)\n", strerror(errno) ));
2853 goto fail;
2854 }
2855
2856 if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, mask_entry, SMB_ACL_MASK) == -1) {
2857 DEBUG(0,("set_canon_ace_list: Failed to set tag type on mask entry. (%s)\n",strerror(errno) ));
2858 goto fail;
2859 }
2860
2861 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, mask_entry, &mask_permset) == -1) {
2862 DEBUG(0,("set_canon_ace_list: Failed to get mask permset. (%s)\n", strerror(errno) ));
2863 goto fail;
2864 }
2865
2866 if (map_acl_perms_to_permset(conn, S_IRUSR|S_IWUSR|S_IXUSR, &mask_permset) == -1) {
2867 DEBUG(0,("set_canon_ace_list: Failed to create mask permset. (%s)\n", strerror(errno) ));
2868 goto fail;
2869 }
2870
2871 if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, mask_entry, mask_permset) == -1) {
2872 DEBUG(0,("set_canon_ace_list: Failed to add mask permset. (%s)\n", strerror(errno) ));
2873 goto fail;
2874 }
2875 }
2876
2877 /*
2878 * Finally apply it to the file or directory.
2879 */
2880
2881 if(default_ace || fsp->is_directory || fsp->fh->fd == -1) {
2882 if (SMB_VFS_SYS_ACL_SET_FILE(conn, fsp->fsp_name->base_name,
2883 the_acl_type, the_acl) == -1) {
2884 /*
2885 * Some systems allow all the above calls and only fail with no ACL support
2886 * when attempting to apply the acl. HPUX with HFS is an example of this. JRA.
2887 */
2888 if (no_acl_syscall_error(errno)) {
2889 *pacl_set_support = False;
2890 }
2891
2892 if (acl_group_override(conn, fsp->fsp_name)) {
2893 int sret;
2894
2895 DEBUG(5,("set_canon_ace_list: acl group "
2896 "control on and current user in file "
2897 "%s primary group.\n",
2898 fsp_str_dbg(fsp)));
2899
2900 become_root();
2901 sret = SMB_VFS_SYS_ACL_SET_FILE(conn,
2902 fsp->fsp_name->base_name, the_acl_type,
2903 the_acl);
2904 unbecome_root();
2905 if (sret == 0) {
2906 ret = True;
2907 }
2908 }
2909
2910 if (ret == False) {
2911 DEBUG(2,("set_canon_ace_list: "
2912 "sys_acl_set_file type %s failed for "
2913 "file %s (%s).\n",
2914 the_acl_type == SMB_ACL_TYPE_DEFAULT ?
2915 "directory default" : "file",
2916 fsp_str_dbg(fsp), strerror(errno)));
2917 goto fail;
2918 }
2919 }
2920 } else {
2921 if (SMB_VFS_SYS_ACL_SET_FD(fsp, the_acl) == -1) {
2922 /*
2923 * Some systems allow all the above calls and only fail with no ACL support
2924 * when attempting to apply the acl. HPUX with HFS is an example of this. JRA.
2925 */
2926 if (no_acl_syscall_error(errno)) {
2927 *pacl_set_support = False;
2928 }
2929
2930 if (acl_group_override(conn, fsp->fsp_name)) {
2931 int sret;
2932
2933 DEBUG(5,("set_canon_ace_list: acl group "
2934 "control on and current user in file "
2935 "%s primary group.\n",
2936 fsp_str_dbg(fsp)));
2937
2938 become_root();
2939 sret = SMB_VFS_SYS_ACL_SET_FD(fsp, the_acl);
2940 unbecome_root();
2941 if (sret == 0) {
2942 ret = True;
2943 }
2944 }
2945
2946 if (ret == False) {
2947 DEBUG(2,("set_canon_ace_list: "
2948 "sys_acl_set_file failed for file %s "
2949 "(%s).\n",
2950 fsp_str_dbg(fsp), strerror(errno)));
2951 goto fail;
2952 }
2953 }
2954 }
2955
2956 ret = True;
2957
2958 fail:
2959
2960 if (the_acl != NULL) {
2961 SMB_VFS_SYS_ACL_FREE_ACL(conn, the_acl);
2962 }
2963
2964 return ret;
2965 }
2966
2967 /****************************************************************************
2968 Find a particular canon_ace entry.
2969 ****************************************************************************/
2970
2971 static struct canon_ace *canon_ace_entry_for(struct canon_ace *list, SMB_ACL_TAG_T type, posix_id *id)
2972 {
2973 while (list) {
2974 if (list->type == type && ((type != SMB_ACL_USER && type != SMB_ACL_GROUP) ||
2975 (type == SMB_ACL_USER && id && id->uid == list->unix_ug.uid) ||
2976 (type == SMB_ACL_GROUP && id && id->gid == list->unix_ug.gid)))
2977 break;
2978 list = list->next;
2979 }
2980 return list;
2981 }
2982
2983 /****************************************************************************
2984
2985 ****************************************************************************/
2986
2987 SMB_ACL_T free_empty_sys_acl(connection_struct *conn, SMB_ACL_T the_acl)
2988 {
2989 SMB_ACL_ENTRY_T entry;
2990
2991 if (!the_acl)
2992 return NULL;
2993 if (SMB_VFS_SYS_ACL_GET_ENTRY(conn, the_acl, SMB_ACL_FIRST_ENTRY, &entry) != 1) {
2994 SMB_VFS_SYS_ACL_FREE_ACL(conn, the_acl);
2995 return NULL;
2996 }
2997 return the_acl;
2998 }
2999
3000 /****************************************************************************
3001 Convert a canon_ace to a generic 3 element permission - if possible.
3002 ****************************************************************************/
3003
3004 #define MAP_PERM(p,mask,result) (((p) & (mask)) ? (result) : 0 )
3005
3006 static bool convert_canon_ace_to_posix_perms( files_struct *fsp, canon_ace *file_ace_list, mode_t *posix_perms)
3007 {
3008 int snum = SNUM(fsp->conn);
3009 size_t ace_count = count_canon_ace_list(file_ace_list);
3010 canon_ace *ace_p;
3011 canon_ace *owner_ace = NULL;
3012 canon_ace *group_ace = NULL;
3013 canon_ace *other_ace = NULL;
3014 mode_t and_bits;
3015 mode_t or_bits;
3016
3017 if (ace_count != 3) {
3018 DEBUG(3,("convert_canon_ace_to_posix_perms: Too many ACE "
3019 "entries for file %s to convert to posix perms.\n",
3020 fsp_str_dbg(fsp)));
3021 return False;
3022 }
3023
3024 for (ace_p = file_ace_list; ace_p; ace_p = ace_p->next) {
3025 if (ace_p->owner_type == UID_ACE)
3026 owner_ace = ace_p;
3027 else if (ace_p->owner_type == GID_ACE)
3028 group_ace = ace_p;
3029 else if (ace_p->owner_type == WORLD_ACE)
3030 other_ace = ace_p;
3031 }
3032
3033 if (!owner_ace || !group_ace || !other_ace) {
3034 DEBUG(3,("convert_canon_ace_to_posix_perms: Can't get "
3035 "standard entries for file %s.\n", fsp_str_dbg(fsp)));
3036 return False;
3037 }
3038
3039 *posix_perms = (mode_t)0;
3040
3041 *posix_perms |= owner_ace->perms;
3042 *posix_perms |= MAP_PERM(group_ace->perms, S_IRUSR, S_IRGRP);
3043 *posix_perms |= MAP_PERM(group_ace->perms, S_IWUSR, S_IWGRP);
3044 *posix_perms |= MAP_PERM(group_ace->perms, S_IXUSR, S_IXGRP);
3045 *posix_perms |= MAP_PERM(other_ace->perms, S_IRUSR, S_IROTH);
3046 *posix_perms |= MAP_PERM(other_ace->perms, S_IWUSR, S_IWOTH);
3047 *posix_perms |= MAP_PERM(other_ace->perms, S_IXUSR, S_IXOTH);
3048
3049 /* The owner must have at least read access. */
3050
3051 *posix_perms |= S_IRUSR;
3052 if (fsp->is_directory)
3053 *posix_perms |= (S_IWUSR|S_IXUSR);
3054
3055 /* If requested apply the masks. */
3056
3057 /* Get the initial bits to apply. */
3058
3059 if (fsp->is_directory) {
3060 and_bits = lp_dir_security_mask(snum);
3061 or_bits = lp_force_dir_security_mode(snum);
3062 } else {
3063 and_bits = lp_security_mask(snum);
3064 or_bits = lp_force_security_mode(snum);
3065 }
3066
3067 *posix_perms = (((*posix_perms) & and_bits)|or_bits);
3068
3069 DEBUG(10,("convert_canon_ace_to_posix_perms: converted u=%o,g=%o,w=%o "
3070 "to perm=0%o for file %s.\n", (int)owner_ace->perms,
3071 (int)group_ace->perms, (int)other_ace->perms,
3072 (int)*posix_perms, fsp_str_dbg(fsp)));
3073
3074 return True;
3075 }
3076
3077 /****************************************************************************
3078 Incoming NT ACLs on a directory can be split into a default POSIX acl (CI|OI|IO) and
3079 a normal POSIX acl. Win2k needs these split acls re-merging into one ACL
3080 with CI|OI set so it is inherited and also applies to the directory.
3081 Based on code from "Jim McDonough" <jmcd@us.ibm.com>.
3082 ****************************************************************************/
3083
3084 static size_t merge_default_aces( struct security_ace *nt_ace_list, size_t num_aces)
3085 {
3086 size_t i, j;
3087
3088 for (i = 0; i < num_aces; i++) {
3089 for (j = i+1; j < num_aces; j++) {
3090 uint32 i_flags_ni = (nt_ace_list[i].flags & ~SEC_ACE_FLAG_INHERITED_ACE);
3091 uint32 j_flags_ni = (nt_ace_list[j].flags & ~SEC_ACE_FLAG_INHERITED_ACE);
3092 bool i_inh = (nt_ace_list[i].flags & SEC_ACE_FLAG_INHERITED_ACE) ? True : False;
3093 bool j_inh = (nt_ace_list[j].flags & SEC_ACE_FLAG_INHERITED_ACE) ? True : False;
3094
3095 /* We know the lower number ACE's are file entries. */
3096 if ((nt_ace_list[i].type == nt_ace_list[j].type) &&
3097 (nt_ace_list[i].size == nt_ace_list[j].size) &&
3098 (nt_ace_list[i].access_mask == nt_ace_list[j].access_mask) &&
3099 dom_sid_equal(&nt_ace_list[i].trustee, &nt_ace_list[j].trustee) &&
3100 (i_inh == j_inh) &&
3101 (i_flags_ni == 0) &&
3102 (j_flags_ni == (SEC_ACE_FLAG_OBJECT_INHERIT|
3103 SEC_ACE_FLAG_CONTAINER_INHERIT|
3104 SEC_ACE_FLAG_INHERIT_ONLY))) {
3105 /*
3106 * W2K wants to have access allowed zero access ACE's
3107 * at the end of the list. If the mask is zero, merge
3108 * the non-inherited ACE onto the inherited ACE.
3109 */
3110
3111 if (nt_ace_list[i].access_mask == 0) {
3112 nt_ace_list[j].flags = SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT|
3113 (i_inh ? SEC_ACE_FLAG_INHERITED_ACE : 0);
3114 if (num_aces - i - 1 > 0)
3115 memmove(&nt_ace_list[i], &nt_ace_list[i+1], (num_aces-i-1) *
3116 sizeof(struct security_ace));
3117
3118 DEBUG(10,("merge_default_aces: Merging zero access ACE %u onto ACE %u.\n",
3119 (unsigned int)i, (unsigned int)j ));
3120 } else {
3121 /*
3122 * These are identical except for the flags.
3123 * Merge the inherited ACE onto the non-inherited ACE.
3124 */
3125
3126 nt_ace_list[i].flags = SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT|
3127 (i_inh ? SEC_ACE_FLAG_INHERITED_ACE : 0);
3128 if (num_aces - j - 1 > 0)
3129 memmove(&nt_ace_list[j], &nt_ace_list[j+1], (num_aces-j-1) *
3130 sizeof(struct security_ace));
3131
3132 DEBUG(10,("merge_default_aces: Merging ACE %u onto ACE %u.\n",
3133 (unsigned int)j, (unsigned int)i ));
3134 }
3135 num_aces--;
3136 break;
3137 }
3138 }
3139 }
3140
3141 return num_aces;
3142 }
3143
3144 /*
3145 * Add or Replace ACE entry.
3146 * In some cases we need to add a specific ACE for compatibility reasons.
3147 * When doing that we must make sure we are not actually creating a duplicate
3148 * entry. So we need to search whether an ACE entry already exist and eventually
3149 * replacce the access mask, or add a completely new entry if none was found.
3150 *
3151 * This function assumes the array has enough space to add a new entry without
3152 * any reallocation of memory.
3153 */
3154
3155 static void add_or_replace_ace(struct security_ace *nt_ace_list, size_t *num_aces,
3156 const struct dom_sid *sid, enum security_ace_type type,
3157 uint32_t mask, uint8_t flags)
3158 {
3159 int i;
3160
3161 /* first search for a duplicate */
3162 for (i = 0; i < *num_aces; i++) {
3163 if (dom_sid_equal(&nt_ace_list[i].trustee, sid) &&
3164 (nt_ace_list[i].flags == flags)) break;
3165 }
3166
3167 if (i < *num_aces) { /* found */
3168 nt_ace_list[i].type = type;
3169 nt_ace_list[i].access_mask = mask;
3170 DEBUG(10, ("Replacing ACE %d with SID %s and flags %02x\n",
3171 i, sid_string_dbg(sid), flags));
3172 return;
3173 }
3174
3175 /* not found, append it */
3176 init_sec_ace(&nt_ace_list[(*num_aces)++], sid, type, mask, flags);
3177 }
3178
3179
3180 /****************************************************************************
3181 Reply to query a security descriptor from an fsp. If it succeeds it allocates
3182 the space for the return elements and returns the size needed to return the
3183 security descriptor. This should be the only external function needed for
3184 the UNIX style get ACL.
3185 ****************************************************************************/
3186
3187 static NTSTATUS posix_get_nt_acl_common(struct connection_struct *conn,
3188 const char *name,
3189 const SMB_STRUCT_STAT *sbuf,
3190 struct pai_val *pal,
3191 SMB_ACL_T posix_acl,
3192 SMB_ACL_T def_acl,
3193 uint32_t security_info,
3194 struct security_descriptor **ppdesc)
3195 {
3196 struct dom_sid owner_sid;
3197 struct dom_sid group_sid;
3198 size_t sd_size = 0;
3199 struct security_acl *psa = NULL;
3200 size_t num_acls = 0;
3201 size_t num_def_acls = 0;
3202 size_t num_aces = 0;
3203 canon_ace *file_ace = NULL;
3204 canon_ace *dir_ace = NULL;
3205 struct security_ace *nt_ace_list = NULL;
3206 size_t num_profile_acls = 0;
3207 struct dom_sid orig_owner_sid;
3208 struct security_descriptor *psd = NULL;
3209 int i;
3210
3211 /*
3212 * Get the owner, group and world SIDs.
3213 */
3214
3215 create_file_sids(sbuf, &owner_sid, &group_sid);
3216
3217 if (lp_profile_acls(SNUM(conn))) {
3218 /* For WXP SP1 the owner must be administrators. */
3219 sid_copy(&orig_owner_sid, &owner_sid);
3220 sid_copy(&owner_sid, &global_sid_Builtin_Administrators);
3221 sid_copy(&group_sid, &global_sid_Builtin_Users);
3222 num_profile_acls = 3;
3223 }
3224
3225 if ((security_info & SECINFO_DACL) && !(security_info & SECINFO_PROTECTED_DACL)) {
3226
3227 /*
3228 * In the optimum case Creator Owner and Creator Group would be used for
3229 * the ACL_USER_OBJ and ACL_GROUP_OBJ entries, respectively, but this
3230 * would lead to usability problems under Windows: The Creator entries
3231 * are only available in browse lists of directories and not for files;
3232 * additionally the identity of the owning group couldn't be determined.
3233 * We therefore use those identities only for Default ACLs.
3234 */
3235
3236 /* Create the canon_ace lists. */
3237 file_ace = canonicalise_acl(conn, name, posix_acl, sbuf,
3238 &owner_sid, &group_sid, pal,
3239 SMB_ACL_TYPE_ACCESS);
3240
3241 /* We must have *some* ACLS. */
3242
3243 if (count_canon_ace_list(file_ace) == 0) {
3244 DEBUG(0,("get_nt_acl : No ACLs on file (%s) !\n", name));
3245 goto done;
3246 }
3247
3248 if (S_ISDIR(sbuf->st_ex_mode) && def_acl) {
3249 dir_ace = canonicalise_acl(conn, name, def_acl,
3250 sbuf,
3251 &global_sid_Creator_Owner,
3252 &global_sid_Creator_Group,
3253 pal, SMB_ACL_TYPE_DEFAULT);
3254 }
3255
3256 /*
3257 * Create the NT ACE list from the canonical ace lists.
3258 */
3259
3260 {
3261 canon_ace *ace;
3262 enum security_ace_type nt_acl_type;
3263
3264 if (nt4_compatible_acls() && dir_ace) {
3265 /*
3266 * NT 4 chokes if an ACL contains an INHERIT_ONLY entry
3267 * but no non-INHERIT_ONLY entry for one SID. So we only
3268 * remove entries from the Access ACL if the
3269 * corresponding Default ACL entries have also been
3270 * removed. ACEs for CREATOR-OWNER and CREATOR-GROUP
3271 * are exceptions. We can do nothing
3272 * intelligent if the Default ACL contains entries that
3273 * are not also contained in the Access ACL, so this
3274 * case will still fail under NT 4.
3275 */
3276
3277 ace = canon_ace_entry_for(dir_ace, SMB_ACL_OTHER, NULL);
3278 if (ace && !ace->perms) {
3279 DLIST_REMOVE(dir_ace, ace);
3280 SAFE_FREE(ace);
3281
3282 ace = canon_ace_entry_for(file_ace, SMB_ACL_OTHER, NULL);
3283 if (ace && !ace->perms) {
3284 DLIST_REMOVE(file_ace, ace);
3285 SAFE_FREE(ace);
3286 }
3287 }
3288
3289 /*
3290 * WinNT doesn't usually have Creator Group
3291 * in browse lists, so we send this entry to
3292 * WinNT even if it contains no relevant
3293 * permissions. Once we can add
3294 * Creator Group to browse lists we can
3295 * re-enable this.
3296 */
3297
3298 #if 0
3299 ace = canon_ace_entry_for(dir_ace, SMB_ACL_GROUP_OBJ, NULL);
3300 if (ace && !ace->perms) {
3301 DLIST_REMOVE(dir_ace, ace);
3302 SAFE_FREE(ace);
3303 }
3304 #endif
3305
3306 ace = canon_ace_entry_for(file_ace, SMB_ACL_GROUP_OBJ, NULL);
3307 if (ace && !ace->perms) {
3308 DLIST_REMOVE(file_ace, ace);
3309 SAFE_FREE(ace);
3310 }
3311 }
3312
3313 num_acls = count_canon_ace_list(file_ace);
3314 num_def_acls = count_canon_ace_list(dir_ace);
3315
3316 /* Allocate the ace list. */
3317 if ((nt_ace_list = SMB_MALLOC_ARRAY(struct security_ace,num_acls + num_profile_acls + num_def_acls)) == NULL) {
3318 DEBUG(0,("get_nt_acl: Unable to malloc space for nt_ace_list.\n"));
3319 goto done;
3320 }
3321
3322 memset(nt_ace_list, '\0', (num_acls + num_def_acls) * sizeof(struct security_ace) );
3323
3324 /*
3325 * Create the NT ACE list from the canonical ace lists.
3326 */
3327
3328 for (ace = file_ace; ace != NULL; ace = ace->next) {
3329 uint32_t acc = map_canon_ace_perms(SNUM(conn),
3330 &nt_acl_type,
3331 ace->perms,
3332 S_ISDIR(sbuf->st_ex_mode));
3333 init_sec_ace(&nt_ace_list[num_aces++],
3334 &ace->trustee,
3335 nt_acl_type,
3336 acc,
3337 ace->ace_flags);
3338 }
3339
3340 /* The User must have access to a profile share - even
3341 * if we can't map the SID. */
3342 if (lp_profile_acls(SNUM(conn))) {
3343 add_or_replace_ace(nt_ace_list, &num_aces,
3344 &global_sid_Builtin_Users,
3345 SEC_ACE_TYPE_ACCESS_ALLOWED,
3346 FILE_GENERIC_ALL, 0);
3347 }
3348
3349 for (ace = dir_ace; ace != NULL; ace = ace->next) {
3350 uint32_t acc = map_canon_ace_perms(SNUM(conn),
3351 &nt_acl_type,
3352 ace->perms,
3353 S_ISDIR(sbuf->st_ex_mode));
3354 init_sec_ace(&nt_ace_list[num_aces++],
3355 &ace->trustee,
3356 nt_acl_type,
3357 acc,
3358 ace->ace_flags |
3359 SEC_ACE_FLAG_OBJECT_INHERIT|
3360 SEC_ACE_FLAG_CONTAINER_INHERIT|
3361 SEC_ACE_FLAG_INHERIT_ONLY);
3362 }
3363
3364 /* The User must have access to a profile share - even
3365 * if we can't map the SID. */
3366 if (lp_profile_acls(SNUM(conn))) {
3367 add_or_replace_ace(nt_ace_list, &num_aces,
3368 &global_sid_Builtin_Users,
3369 SEC_ACE_TYPE_ACCESS_ALLOWED,
3370 FILE_GENERIC_ALL,
3371 SEC_ACE_FLAG_OBJECT_INHERIT |
3372 SEC_ACE_FLAG_CONTAINER_INHERIT |
3373 SEC_ACE_FLAG_INHERIT_ONLY);
3374 }
3375
3376 /*
3377 * Merge POSIX default ACLs and normal ACLs into one NT ACE.
3378 * Win2K needs this to get the inheritance correct when replacing ACLs
3379 * on a directory tree. Based on work by Jim @ IBM.
3380 */
3381
3382 num_aces = merge_default_aces(nt_ace_list, num_aces);
3383
3384 if (lp_profile_acls(SNUM(conn))) {
3385 for (i = 0; i < num_aces; i++) {
3386 if (dom_sid_equal(&nt_ace_list[i].trustee, &owner_sid)) {
3387 add_or_replace_ace(nt_ace_list, &num_aces,
3388 &orig_owner_sid,
3389 nt_ace_list[i].type,
3390 nt_ace_list[i].access_mask,
3391 nt_ace_list[i].flags);
3392 break;
3393 }
3394 }
3395 }
3396 }
3397
3398 if (num_aces) {
3399 if((psa = make_sec_acl( talloc_tos(), NT4_ACL_REVISION, num_aces, nt_ace_list)) == NULL) {
3400 DEBUG(0,("get_nt_acl: Unable to malloc space for acl.\n"));
3401 goto done;
3402 }
3403 }
3404 } /* security_info & SECINFO_DACL */
3405
3406 psd = make_standard_sec_desc( talloc_tos(),
3407 (security_info & SECINFO_OWNER) ? &owner_sid : NULL,
3408 (security_info & SECINFO_GROUP) ? &group_sid : NULL,
3409 psa,
3410 &sd_size);
3411
3412 if(!psd) {
3413 DEBUG(0,("get_nt_acl: Unable to malloc space for security descriptor.\n"));
3414 sd_size = 0;
3415 goto done;
3416 }
3417
3418 /*
3419 * Windows 2000: The DACL_PROTECTED flag in the security
3420 * descriptor marks the ACL as non-inheriting, i.e., no
3421 * ACEs from higher level directories propagate to this
3422 * ACL. In the POSIX ACL model permissions are only
3423 * inherited at file create time, so ACLs never contain
3424 * any ACEs that are inherited dynamically. The DACL_PROTECTED
3425 * flag doesn't seem to bother Windows NT.
3426 * Always set this if map acl inherit is turned off.
3427 */
3428 if (pal == NULL || !lp_map_acl_inherit(SNUM(conn))) {
3429 psd->type |= SEC_DESC_DACL_PROTECTED;
3430 } else {
3431 psd->type |= pal->sd_type;
3432 }
3433
3434 if (psd->dacl) {
3435 dacl_sort_into_canonical_order(psd->dacl->aces, (unsigned int)psd->dacl->num_aces);
3436 }
3437
3438 *ppdesc = psd;
3439
3440 done:
3441
3442 if (posix_acl) {
3443 SMB_VFS_SYS_ACL_FREE_ACL(conn, posix_acl);
3444 }
3445 if (def_acl) {
3446 SMB_VFS_SYS_ACL_FREE_ACL(conn, def_acl);
3447 }
3448 free_canon_ace_list(file_ace);
3449 free_canon_ace_list(dir_ace);
3450 free_inherited_info(pal);
3451 SAFE_FREE(nt_ace_list);
3452
3453 return NT_STATUS_OK;
3454 }
3455
3456 NTSTATUS posix_fget_nt_acl(struct files_struct *fsp, uint32_t security_info,
3457 struct security_descriptor **ppdesc)
3458 {
3459 SMB_STRUCT_STAT sbuf;
3460 SMB_ACL_T posix_acl = NULL;
3461 struct pai_val *pal;
3462
3463 *ppdesc = NULL;
3464
3465 DEBUG(10,("posix_fget_nt_acl: called for file %s\n",
3466 fsp_str_dbg(fsp)));
3467
3468 /* can it happen that fsp_name == NULL ? */
3469 if (fsp->is_directory || fsp->fh->fd == -1) {
3470 return posix_get_nt_acl(fsp->conn, fsp->fsp_name->base_name,
3471 security_info, ppdesc);
3472 }
3473
3474 /* Get the stat struct for the owner info. */
3475 if(SMB_VFS_FSTAT(fsp, &sbuf) != 0) {
3476 return map_nt_error_from_unix(errno);
3477 }
3478
3479 /* Get the ACL from the fd. */
3480 posix_acl = SMB_VFS_SYS_ACL_GET_FD(fsp);
3481
3482 pal = fload_inherited_info(fsp);
3483
3484 return posix_get_nt_acl_common(fsp->conn, fsp->fsp_name->base_name,
3485 &sbuf, pal, posix_acl, NULL,
3486 security_info, ppdesc);
3487 }
3488
3489 NTSTATUS posix_get_nt_acl(struct connection_struct *conn, const char *name,
3490 uint32_t security_info, struct security_descriptor **ppdesc)
3491 {
3492 SMB_ACL_T posix_acl = NULL;
3493 SMB_ACL_T def_acl = NULL;
3494 struct pai_val *pal;
3495 struct smb_filename smb_fname;
3496 int ret;
3497
3498 *ppdesc = NULL;
3499
3500 DEBUG(10,("posix_get_nt_acl: called for file %s\n", name ));
3501
3502 ZERO_STRUCT(smb_fname);
3503 smb_fname.base_name = discard_const_p(char, name);
3504
3505 /* Get the stat struct for the owner info. */
3506 if (lp_posix_pathnames()) {
3507 ret = SMB_VFS_LSTAT(conn, &smb_fname);
3508 } else {
3509 ret = SMB_VFS_STAT(conn, &smb_fname);
3510 }
3511
3512 if (ret == -1) {
3513 return map_nt_error_from_unix(errno);
3514 }
3515
3516 /* Get the ACL from the path. */
3517 posix_acl = SMB_VFS_SYS_ACL_GET_FILE(conn, name, SMB_ACL_TYPE_ACCESS);
3518
3519 /* If it's a directory get the default POSIX ACL. */
3520 if(S_ISDIR(smb_fname.st.st_ex_mode)) {
3521 def_acl = SMB_VFS_SYS_ACL_GET_FILE(conn, name, SMB_ACL_TYPE_DEFAULT);
3522 def_acl = free_empty_sys_acl(conn, def_acl);
3523 }
3524
3525 pal = load_inherited_info(conn, name);
3526
3527 return posix_get_nt_acl_common(conn, name, &smb_fname.st, pal,
3528 posix_acl, def_acl, security_info,
3529 ppdesc);
3530 }
3531
3532 /****************************************************************************
3533 Try to chown a file. We will be able to chown it under the following conditions.
3534
3535 1) If we have root privileges, then it will just work.
3536 2) If we have SeRestorePrivilege we can change the user + group to any other user.
3537 3) If we have SeTakeOwnershipPrivilege we can change the user to the current user.
3538 4) If we have write permission to the file and dos_filemodes is set
3539 then allow chown to the currently authenticated user.
3540 ****************************************************************************/
3541
3542 NTSTATUS try_chown(files_struct *fsp, uid_t uid, gid_t gid)
3543 {
3544 NTSTATUS status;
3545
3546 if(!CAN_WRITE(fsp->conn)) {
3547 return NT_STATUS_MEDIA_WRITE_PROTECTED;
3548 }
3549
3550 /* Case (1). */
3551 status = vfs_chown_fsp(fsp, uid, gid);
3552 if (NT_STATUS_IS_OK(status)) {
3553 return status;
3554 }
3555
3556 /* Case (2) / (3) */
3557 if (lp_enable_privileges()) {
3558 bool has_take_ownership_priv = security_token_has_privilege(
3559 get_current_nttok(fsp->conn),
3560 SEC_PRIV_TAKE_OWNERSHIP);
3561 bool has_restore_priv = security_token_has_privilege(
3562 get_current_nttok(fsp->conn),
3563 SEC_PRIV_RESTORE);
3564
3565 if (has_restore_priv) {
3566 ; /* Case (2) */
3567 } else if (has_take_ownership_priv) {
3568 /* Case (3) */
3569 if (uid == get_current_uid(fsp->conn)) {
3570 gid = (gid_t)-1;
3571 } else {
3572 has_take_ownership_priv = false;
3573 }
3574 }
3575
3576 if (has_take_ownership_priv || has_restore_priv) {
3577 become_root();
3578 status = vfs_chown_fsp(fsp, uid, gid);
3579 unbecome_root();
3580 return status;
3581 }
3582 }
3583
3584 /* Case (4). */
3585 if (!lp_dos_filemode(SNUM(fsp->conn))) {
3586 return NT_STATUS_ACCESS_DENIED;
3587 }
3588
3589 /* only allow chown to the current user. This is more secure,
3590 and also copes with the case where the SID in a take ownership ACL is
3591 a local SID on the users workstation
3592 */
3593 if (uid != get_current_uid(fsp->conn)) {
3594 return NT_STATUS_ACCESS_DENIED;
3595 }
3596
3597 become_root();
3598 /* Keep the current file gid the same. */
3599 status = vfs_chown_fsp(fsp, uid, (gid_t)-1);
3600 unbecome_root();
3601
3602 return status;
3603 }
3604
3605 #if 0
3606 /* Disable this - prevents ACL inheritance from the ACL editor. JRA. */
3607
3608 /****************************************************************************
3609 Take care of parent ACL inheritance.
3610 ****************************************************************************/
3611
3612 NTSTATUS append_parent_acl(files_struct *fsp,
3613 const struct security_descriptor *pcsd,
3614 struct security_descriptor **pp_new_sd)
3615 {
3616 struct smb_filename *smb_dname = NULL;
3617 struct security_descriptor *parent_sd = NULL;
3618 files_struct *parent_fsp = NULL;
3619 TALLOC_CTX *mem_ctx = talloc_tos();
3620 char *parent_name = NULL;
3621 struct security_ace *new_ace = NULL;
3622 unsigned int num_aces = pcsd->dacl->num_aces;
3623 NTSTATUS status;
3624 int info;
3625 unsigned int i, j;
3626 struct security_descriptor *psd = dup_sec_desc(talloc_tos(), pcsd);
3627 bool is_dacl_protected = (pcsd->type & SEC_DESC_DACL_PROTECTED);
3628
3629 if (psd == NULL) {
3630 return NT_STATUS_NO_MEMORY;
3631 }
3632
3633 if (!parent_dirname(mem_ctx, fsp->fsp_name->base_name, &parent_name,
3634 NULL)) {
3635 return NT_STATUS_NO_MEMORY;
3636 }
3637
3638 status = create_synthetic_smb_fname(mem_ctx, parent_name, NULL, NULL,
3639 &smb_dname);
3640 if (!NT_STATUS_IS_OK(status)) {
3641 goto fail;
3642 }
3643
3644 status = SMB_VFS_CREATE_FILE(
3645 fsp->conn, /* conn */
3646 NULL, /* req */
3647 0, /* root_dir_fid */
3648 smb_dname, /* fname */
3649 FILE_READ_ATTRIBUTES, /* access_mask */
3650 FILE_SHARE_NONE, /* share_access */
3651 FILE_OPEN, /* create_disposition*/
3652 FILE_DIRECTORY_FILE, /* create_options */
3653 0, /* file_attributes */
3654 INTERNAL_OPEN_ONLY, /* oplock_request */
3655 0, /* allocation_size */
3656 NULL, /* sd */
3657 NULL, /* ea_list */
3658 &parent_fsp, /* result */
3659 &info); /* pinfo */
3660
3661 if (!NT_STATUS_IS_OK(status)) {
3662 TALLOC_FREE(smb_dname);
3663 return status;
3664 }
3665
3666 status = SMB_VFS_GET_NT_ACL(parent_fsp->conn, smb_dname->base_name,
3667 SECINFO_DACL, &parent_sd );
3668
3669 close_file(NULL, parent_fsp, NORMAL_CLOSE);
3670 TALLOC_FREE(smb_dname);
3671
3672 if (!NT_STATUS_IS_OK(status)) {
3673 return status;
3674 }
3675
3676 /*
3677 * Make room for potentially all the ACLs from
3678 * the parent. We used to add the ugw triple here,
3679 * as we knew we were dealing with POSIX ACLs.
3680 * We no longer need to do so as we can guarentee
3681 * that a default ACL from the parent directory will
3682 * be well formed for POSIX ACLs if it came from a
3683 * POSIX ACL source, and if we're not writing to a
3684 * POSIX ACL sink then we don't care if it's not well
3685 * formed. JRA.
3686 */
3687
3688 num_aces += parent_sd->dacl->num_aces;
3689
3690 if((new_ace = talloc_zero_array(mem_ctx, struct security_ace,
3691 num_aces)) == NULL) {
3692 return NT_STATUS_NO_MEMORY;
3693 }
3694
3695 /* Start by copying in all the given ACE entries. */
3696 for (i = 0; i < psd->dacl->num_aces; i++) {
3697 sec_ace_copy(&new_ace[i], &psd->dacl->aces[i]);
3698 }
3699
3700 /*
3701 * Note that we're ignoring "inherit permissions" here
3702 * as that really only applies to newly created files. JRA.
3703 */
3704
3705 /* Finally append any inherited ACEs. */
3706 for (j = 0; j < parent_sd->dacl->num_aces; j++) {
3707 struct security_ace *se = &parent_sd->dacl->aces[j];
3708
3709 if (fsp->is_directory) {
3710 if (!(se->flags & SEC_ACE_FLAG_CONTAINER_INHERIT)) {
3711 /* Doesn't apply to a directory - ignore. */
3712 DEBUG(10,("append_parent_acl: directory %s "
3713 "ignoring non container "
3714 "inherit flags %u on ACE with sid %s "
3715 "from parent %s\n",
3716 fsp_str_dbg(fsp),
3717 (unsigned int)se->flags,
3718 sid_string_dbg(&se->trustee),
3719 parent_name));
3720 continue;
3721 }
3722 } else {
3723 if (!(se->flags & SEC_ACE_FLAG_OBJECT_INHERIT)) {
3724 /* Doesn't apply to a file - ignore. */
3725 DEBUG(10,("append_parent_acl: file %s "
3726 "ignoring non object "
3727 "inherit flags %u on ACE with sid %s "
3728 "from parent %s\n",
3729 fsp_str_dbg(fsp),
3730 (unsigned int)se->flags,
3731 sid_string_dbg(&se->trustee),
3732 parent_name));
3733 continue;
3734 }
3735 }
3736
3737 if (is_dacl_protected) {
3738 /* If the DACL is protected it means we must
3739 * not overwrite an existing ACE entry with the
3740 * same SID. This is order N^2. Ouch :-(. JRA. */
3741 unsigned int k;
3742 for (k = 0; k < psd->dacl->num_aces; k++) {
3743 if (dom_sid_equal(&psd->dacl->aces[k].trustee,
3744 &se->trustee)) {
3745 break;
3746 }
3747 }
3748 if (k < psd->dacl->num_aces) {
3749 /* SID matched. Ignore. */
3750 DEBUG(10,("append_parent_acl: path %s "
3751 "ignoring ACE with protected sid %s "
3752 "from parent %s\n",
3753 fsp_str_dbg(fsp),
3754 sid_string_dbg(&se->trustee),
3755 parent_name));
3756 continue;
3757 }
3758 }
3759
3760 sec_ace_copy(&new_ace[i], se);
3761 if (se->flags & SEC_ACE_FLAG_NO_PROPAGATE_INHERIT) {
3762 new_ace[i].flags &= ~(SEC_ACE_FLAG_VALID_INHERIT);
3763 }
3764 new_ace[i].flags |= SEC_ACE_FLAG_INHERITED_ACE;
3765
3766 if (fsp->is_directory) {
3767 /*
3768 * Strip off any inherit only. It's applied.
3769 */
3770 new_ace[i].flags &= ~(SEC_ACE_FLAG_INHERIT_ONLY);
3771 if (se->flags & SEC_ACE_FLAG_NO_PROPAGATE_INHERIT) {
3772 /* No further inheritance. */
3773 new_ace[i].flags &=
3774 ~(SEC_ACE_FLAG_CONTAINER_INHERIT|
3775 SEC_ACE_FLAG_OBJECT_INHERIT);
3776 }
3777 } else {
3778 /*
3779 * Strip off any container or inherit
3780 * flags, they can't apply to objects.
3781 */
3782 new_ace[i].flags &= ~(SEC_ACE_FLAG_CONTAINER_INHERIT|
3783 SEC_ACE_FLAG_INHERIT_ONLY|
3784 SEC_ACE_FLAG_NO_PROPAGATE_INHERIT);
3785 }
3786 i++;
3787
3788 DEBUG(10,("append_parent_acl: path %s "
3789 "inheriting ACE with sid %s "
3790 "from parent %s\n",
3791 fsp_str_dbg(fsp),
3792 sid_string_dbg(&se->trustee),
3793 parent_name));
3794 }
3795
3796 psd->dacl->aces = new_ace;
3797 psd->dacl->num_aces = i;
3798 psd->type &= ~(SEC_DESC_DACL_AUTO_INHERITED|
3799 SEC_DESC_DACL_AUTO_INHERIT_REQ);
3800
3801 *pp_new_sd = psd;
3802 return status;
3803 }
3804 #endif
3805
3806 /****************************************************************************
3807 Reply to set a security descriptor on an fsp. security_info_sent is the
3808 description of the following NT ACL.
3809 This should be the only external function needed for the UNIX style set ACL.
3810 We make a copy of psd_orig as internal functions modify the elements inside
3811 it, even though it's a const pointer.
3812 ****************************************************************************/
3813
3814 NTSTATUS set_nt_acl(files_struct *fsp, uint32 security_info_sent, const struct security_descriptor *psd_orig)
3815 {
3816 connection_struct *conn = fsp->conn;
3817 uid_t user = (uid_t)-1;
3818 gid_t grp = (gid_t)-1;
3819 struct dom_sid file_owner_sid;
3820 struct dom_sid file_grp_sid;
3821 canon_ace *file_ace_list = NULL;
3822 canon_ace *dir_ace_list = NULL;
3823 bool acl_perms = False;
3824 mode_t orig_mode = (mode_t)0;
3825 NTSTATUS status;
3826 bool set_acl_as_root = false;
3827 bool acl_set_support = false;
3828 bool ret = false;
3829 struct security_descriptor *psd = NULL;
3830
3831 DEBUG(10,("set_nt_acl: called for file %s\n",
3832 fsp_str_dbg(fsp)));
3833
3834 if (!CAN_WRITE(conn)) {
3835 DEBUG(10,("set acl rejected on read-only share\n"));
3836 return NT_STATUS_MEDIA_WRITE_PROTECTED;
3837 }
3838
3839 if (!psd_orig) {
3840 return NT_STATUS_INVALID_PARAMETER;
3841 }
3842
3843 psd = dup_sec_desc(talloc_tos(), psd_orig);
3844 if (!psd) {
3845 return NT_STATUS_NO_MEMORY;
3846 }
3847
3848 /*
3849 * Get the current state of the file.
3850 */
3851
3852 status = vfs_stat_fsp(fsp);
3853 if (!NT_STATUS_IS_OK(status)) {
3854 return status;
3855 }
3856
3857 /* Save the original element we check against. */
3858 orig_mode = fsp->fsp_name->st.st_ex_mode;
3859
3860 /*
3861 * Unpack the user/group/world id's.
3862 */
3863
3864 /* POSIX can't cope with missing owner/group. */
3865 if ((security_info_sent & SECINFO_OWNER) && (psd->owner_sid == NULL)) {
3866 security_info_sent &= ~SECINFO_OWNER;
3867 }
3868 if ((security_info_sent & SECINFO_GROUP) && (psd->group_sid == NULL)) {
3869 security_info_sent &= ~SECINFO_GROUP;
3870 }
3871
3872 status = unpack_nt_owners( conn, &user, &grp, security_info_sent, psd);
3873 if (!NT_STATUS_IS_OK(status)) {
3874 return status;
3875 }
3876
3877 /*
3878 * Do we need to chown ? If so this must be done first as the incoming
3879 * CREATOR_OWNER acl will be relative to the *new* owner, not the old.
3880 * Noticed by Simo.
3881 */
3882
3883 if (((user != (uid_t)-1) && (fsp->fsp_name->st.st_ex_uid != user)) ||
3884 (( grp != (gid_t)-1) && (fsp->fsp_name->st.st_ex_gid != grp))) {
3885
3886 DEBUG(3,("set_nt_acl: chown %s. uid = %u, gid = %u.\n",
3887 fsp_str_dbg(fsp), (unsigned int)user,
3888 (unsigned int)grp));
3889
3890 status = try_chown(fsp, user, grp);
3891 if(!NT_STATUS_IS_OK(status)) {
3892 DEBUG(3,("set_nt_acl: chown %s, %u, %u failed. Error "
3893 "= %s.\n", fsp_str_dbg(fsp),
3894 (unsigned int)user,
3895 (unsigned int)grp,
3896 nt_errstr(status)));
3897 return status;
3898 }
3899
3900 /*
3901 * Recheck the current state of the file, which may have changed.
3902 * (suid/sgid bits, for instance)
3903 */
3904
3905 status = vfs_stat_fsp(fsp);
3906 if (!NT_STATUS_IS_OK(status)) {
3907 return status;
3908 }
3909
3910 /* Save the original element we check against. */
3911 orig_mode = fsp->fsp_name->st.st_ex_mode;
3912
3913 /* If we successfully chowned, we know we must
3914 * be able to set the acl, so do it as root.
3915 */
3916 set_acl_as_root = true;
3917 }
3918
3919 create_file_sids(&fsp->fsp_name->st, &file_owner_sid, &file_grp_sid);
3920
3921 if((security_info_sent & SECINFO_DACL) &&
3922 (psd->type & SEC_DESC_DACL_PRESENT) &&
3923 (psd->dacl == NULL)) {
3924 struct security_ace ace[3];
3925
3926 /* We can't have NULL DACL in POSIX.
3927 Use owner/group/Everyone -> full access. */
3928
3929 init_sec_ace(&ace[0],
3930 &file_owner_sid,
3931 SEC_ACE_TYPE_ACCESS_ALLOWED,
3932 GENERIC_ALL_ACCESS,
3933 0);
3934 init_sec_ace(&ace[1],
3935 &file_grp_sid,
3936 SEC_ACE_TYPE_ACCESS_ALLOWED,
3937 GENERIC_ALL_ACCESS,
3938 0);
3939 init_sec_ace(&ace[2],
3940 &global_sid_World,
3941 SEC_ACE_TYPE_ACCESS_ALLOWED,
3942 GENERIC_ALL_ACCESS,
3943 0);
3944 psd->dacl = make_sec_acl(talloc_tos(),
3945 NT4_ACL_REVISION,
3946 3,
3947 ace);
3948 if (psd->dacl == NULL) {
3949 return NT_STATUS_NO_MEMORY;
3950 }
3951 security_acl_map_generic(psd->dacl, &file_generic_mapping);
3952 }
3953
3954 acl_perms = unpack_canon_ace(fsp, &fsp->fsp_name->st, &file_owner_sid,
3955 &file_grp_sid, &file_ace_list,
3956 &dir_ace_list, security_info_sent, psd);
3957
3958 /* Ignore W2K traverse DACL set. */
3959 if (!file_ace_list && !dir_ace_list) {
3960 return NT_STATUS_OK;
3961 }
3962
3963 if (!acl_perms) {
3964 DEBUG(3,("set_nt_acl: cannot set permissions\n"));
3965 free_canon_ace_list(file_ace_list);
3966 free_canon_ace_list(dir_ace_list);
3967 return NT_STATUS_ACCESS_DENIED;
3968 }
3969
3970 /*
3971 * Only change security if we got a DACL.
3972 */
3973
3974 if(!(security_info_sent & SECINFO_DACL) || (psd->dacl == NULL)) {
3975 free_canon_ace_list(file_ace_list);
3976 free_canon_ace_list(dir_ace_list);
3977 return NT_STATUS_OK;
3978 }
3979
3980 /*
3981 * Try using the POSIX ACL set first. Fall back to chmod if
3982 * we have no ACL support on this filesystem.
3983 */
3984
3985 if (acl_perms && file_ace_list) {
3986 if (set_acl_as_root) {
3987 become_root();
3988 }
3989 ret = set_canon_ace_list(fsp, file_ace_list, false,
3990 &fsp->fsp_name->st, &acl_set_support);
3991 if (set_acl_as_root) {
3992 unbecome_root();
3993 }
3994 if (acl_set_support && ret == false) {
3995 DEBUG(3,("set_nt_acl: failed to set file acl on file "
3996 "%s (%s).\n", fsp_str_dbg(fsp),
3997 strerror(errno)));
3998 free_canon_ace_list(file_ace_list);
3999 free_canon_ace_list(dir_ace_list);
4000 return map_nt_error_from_unix(errno);
4001 }
4002 }
4003
4004 if (acl_perms && acl_set_support && fsp->is_directory) {
4005 if (dir_ace_list) {
4006 if (set_acl_as_root) {
4007 become_root();
4008 }
4009 ret = set_canon_ace_list(fsp, dir_ace_list, true,
4010 &fsp->fsp_name->st,
4011 &acl_set_support);
4012 if (set_acl_as_root) {
4013 unbecome_root();
4014 }
4015 if (ret == false) {
4016 DEBUG(3,("set_nt_acl: failed to set default "
4017 "acl on directory %s (%s).\n",
4018 fsp_str_dbg(fsp), strerror(errno)));
4019 free_canon_ace_list(file_ace_list);
4020 free_canon_ace_list(dir_ace_list);
4021 return map_nt_error_from_unix(errno);
4022 }
4023 } else {
4024 int sret = -1;
4025
4026 /*
4027 * No default ACL - delete one if it exists.
4028 */
4029
4030 if (set_acl_as_root) {
4031 become_root();
4032 }
4033 sret = SMB_VFS_SYS_ACL_DELETE_DEF_FILE(conn,
4034 fsp->fsp_name->base_name);
4035 if (set_acl_as_root) {
4036 unbecome_root();
4037 }
4038 if (sret == -1) {
4039 if (acl_group_override(conn, fsp->fsp_name)) {
4040 DEBUG(5,("set_nt_acl: acl group "
4041 "control on and current user "
4042 "in file %s primary group. "
4043 "Override delete_def_acl\n",
4044 fsp_str_dbg(fsp)));
4045
4046 become_root();
4047 sret =
4048 SMB_VFS_SYS_ACL_DELETE_DEF_FILE(
4049 conn,
4050 fsp->fsp_name->base_name);
4051 unbecome_root();
4052 }
4053
4054 if (sret == -1) {
4055 DEBUG(3,("set_nt_acl: sys_acl_delete_def_file failed (%s)\n", strerror(errno)));
4056 free_canon_ace_list(file_ace_list);
4057 free_canon_ace_list(dir_ace_list);
4058 return map_nt_error_from_unix(errno);
4059 }
4060 }
4061 }
4062 }
4063
4064 if (acl_set_support) {
4065 if (set_acl_as_root) {
4066 become_root();
4067 }
4068 store_inheritance_attributes(fsp,
4069 file_ace_list,
4070 dir_ace_list,
4071 psd->type);
4072 if (set_acl_as_root) {
4073 unbecome_root();
4074 }
4075 }
4076
4077 /*
4078 * If we cannot set using POSIX ACLs we fall back to checking if we need to chmod.
4079 */
4080
4081 if(!acl_set_support && acl_perms) {
4082 mode_t posix_perms;
4083
4084 if (!convert_canon_ace_to_posix_perms( fsp, file_ace_list, &posix_perms)) {
4085 free_canon_ace_list(file_ace_list);
4086 free_canon_ace_list(dir_ace_list);
4087 DEBUG(3,("set_nt_acl: failed to convert file acl to "
4088 "posix permissions for file %s.\n",
4089 fsp_str_dbg(fsp)));
4090 return NT_STATUS_ACCESS_DENIED;
4091 }
4092
4093 if (orig_mode != posix_perms) {
4094 int sret = -1;
4095
4096 DEBUG(3,("set_nt_acl: chmod %s. perms = 0%o.\n",
4097 fsp_str_dbg(fsp), (unsigned int)posix_perms));
4098
4099 if (set_acl_as_root) {
4100 become_root();
4101 }
4102 sret = SMB_VFS_CHMOD(conn, fsp->fsp_name->base_name,
4103 posix_perms);
4104 if (set_acl_as_root) {
4105 unbecome_root();
4106 }
4107 if(sret == -1) {
4108 if (acl_group_override(conn, fsp->fsp_name)) {
4109 DEBUG(5,("set_nt_acl: acl group "
4110 "control on and current user "
4111 "in file %s primary group. "
4112 "Override chmod\n",
4113 fsp_str_dbg(fsp)));
4114
4115 become_root();
4116 sret = SMB_VFS_CHMOD(conn,
4117 fsp->fsp_name->base_name,
4118 posix_perms);
4119 unbecome_root();
4120 }
4121
4122 if (sret == -1) {
4123 DEBUG(3,("set_nt_acl: chmod %s, 0%o "
4124 "failed. Error = %s.\n",
4125 fsp_str_dbg(fsp),
4126 (unsigned int)posix_perms,
4127 strerror(errno)));
4128 free_canon_ace_list(file_ace_list);
4129 free_canon_ace_list(dir_ace_list);
4130 return map_nt_error_from_unix(errno);
4131 }
4132 }
4133 }
4134 }
4135
4136 free_canon_ace_list(file_ace_list);
4137 free_canon_ace_list(dir_ace_list);
4138
4139 /* Ensure the stat struct in the fsp is correct. */
4140 status = vfs_stat_fsp(fsp);
4141
4142 return NT_STATUS_OK;
4143 }
4144
4145 /****************************************************************************
4146 Get the actual group bits stored on a file with an ACL. Has no effect if
4147 the file has no ACL. Needed in dosmode code where the stat() will return
4148 the mask bits, not the real group bits, for a file with an ACL.
4149 ****************************************************************************/
4150
4151 int get_acl_group_bits( connection_struct *conn, const char *fname, mode_t *mode )
4152 {
4153 int entry_id = SMB_ACL_FIRST_ENTRY;
4154 SMB_ACL_ENTRY_T entry;
4155 SMB_ACL_T posix_acl;
4156 int result = -1;
4157
4158 posix_acl = SMB_VFS_SYS_ACL_GET_FILE(conn, fname, SMB_ACL_TYPE_ACCESS);
4159 if (posix_acl == (SMB_ACL_T)NULL)
4160 return -1;
4161
4162 while (SMB_VFS_SYS_ACL_GET_ENTRY(conn, posix_acl, entry_id, &entry) == 1) {
4163 SMB_ACL_TAG_T tagtype;
4164 SMB_ACL_PERMSET_T permset;
4165
4166 entry_id = SMB_ACL_NEXT_ENTRY;
4167
4168 if (SMB_VFS_SYS_ACL_GET_TAG_TYPE(conn, entry, &tagtype) ==-1)
4169 break;
4170
4171 if (tagtype == SMB_ACL_GROUP_OBJ) {
4172 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, entry, &permset) == -1) {
4173 break;
4174 } else {
4175 *mode &= ~(S_IRGRP|S_IWGRP|S_IXGRP);
4176 *mode |= (SMB_VFS_SYS_ACL_GET_PERM(conn, permset, SMB_ACL_READ) ? S_IRGRP : 0);
4177 *mode |= (SMB_VFS_SYS_ACL_GET_PERM(conn, permset, SMB_ACL_WRITE) ? S_IWGRP : 0);
4178 *mode |= (SMB_VFS_SYS_ACL_GET_PERM(conn, permset, SMB_ACL_EXECUTE) ? S_IXGRP : 0);
4179 result = 0;
4180 break;
4181 }
4182 }
4183 }
4184 SMB_VFS_SYS_ACL_FREE_ACL(conn, posix_acl);
4185 return result;
4186 }
4187
4188 /****************************************************************************
4189 Do a chmod by setting the ACL USER_OBJ, GROUP_OBJ and OTHER bits in an ACL
4190 and set the mask to rwx. Needed to preserve complex ACLs set by NT.
4191 ****************************************************************************/
4192
4193 static int chmod_acl_internals( connection_struct *conn, SMB_ACL_T posix_acl, mode_t mode)
4194 {
4195 int entry_id = SMB_ACL_FIRST_ENTRY;
4196 SMB_ACL_ENTRY_T entry;
4197 int num_entries = 0;
4198
4199 while ( SMB_VFS_SYS_ACL_GET_ENTRY(conn, posix_acl, entry_id, &entry) == 1) {
4200 SMB_ACL_TAG_T tagtype;
4201 SMB_ACL_PERMSET_T permset;
4202 mode_t perms;
4203
4204 entry_id = SMB_ACL_NEXT_ENTRY;
4205
4206 if (SMB_VFS_SYS_ACL_GET_TAG_TYPE(conn, entry, &tagtype) == -1)
4207 return -1;
4208
4209 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, entry, &permset) == -1)
4210 return -1;
4211
4212 num_entries++;
4213
4214 switch(tagtype) {
4215 case SMB_ACL_USER_OBJ:
4216 perms = unix_perms_to_acl_perms(mode, S_IRUSR, S_IWUSR, S_IXUSR);
4217 break;
4218 case SMB_ACL_GROUP_OBJ:
4219 perms = unix_perms_to_acl_perms(mode, S_IRGRP, S_IWGRP, S_IXGRP);
4220 break;
4221 case SMB_ACL_MASK:
4222 /*
4223 * FIXME: The ACL_MASK entry permissions should really be set to
4224 * the union of the permissions of all ACL_USER,
4225 * ACL_GROUP_OBJ, and ACL_GROUP entries. That's what
4226 * acl_calc_mask() does, but Samba ACLs doesn't provide it.
4227 */
4228 perms = S_IRUSR|S_IWUSR|S_IXUSR;
4229 break;
4230 case SMB_ACL_OTHER:
4231 perms = unix_perms_to_acl_perms(mode, S_IROTH, S_IWOTH, S_IXOTH);
4232 break;
4233 default:
4234 continue;
4235 }
4236
4237 if (map_acl_perms_to_permset(conn, perms, &permset) == -1)
4238 return -1;
4239
4240 if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, entry, permset) == -1)
4241 return -1;
4242 }
4243
4244 /*
4245 * If this is a simple 3 element ACL or no elements then it's a standard
4246 * UNIX permission set. Just use chmod...
4247 */
4248
4249 if ((num_entries == 3) || (num_entries == 0))
4250 return -1;
4251
4252 return 0;
4253 }
4254
4255 /****************************************************************************
4256 Get the access ACL of FROM, do a chmod by setting the ACL USER_OBJ,
4257 GROUP_OBJ and OTHER bits in an ACL and set the mask to rwx. Set the
4258 resulting ACL on TO. Note that name is in UNIX character set.
4259 ****************************************************************************/
4260
4261 static int copy_access_posix_acl(connection_struct *conn, const char *from, const char *to, mode_t mode)
4262 {
4263 SMB_ACL_T posix_acl = NULL;
4264 int ret = -1;
4265
4266 if ((posix_acl = SMB_VFS_SYS_ACL_GET_FILE(conn, from, SMB_ACL_TYPE_ACCESS)) == NULL)
4267 return -1;
4268
4269 if ((ret = chmod_acl_internals(conn, posix_acl, mode)) == -1)
4270 goto done;
4271
4272 ret = SMB_VFS_SYS_ACL_SET_FILE(conn, to, SMB_ACL_TYPE_ACCESS, posix_acl);
4273
4274 done:
4275
4276 SMB_VFS_SYS_ACL_FREE_ACL(conn, posix_acl);
4277 return ret;
4278 }
4279
4280 /****************************************************************************
4281 Do a chmod by setting the ACL USER_OBJ, GROUP_OBJ and OTHER bits in an ACL
4282 and set the mask to rwx. Needed to preserve complex ACLs set by NT.
4283 Note that name is in UNIX character set.
4284 ****************************************************************************/
4285
4286 int chmod_acl(connection_struct *conn, const char *name, mode_t mode)
4287 {
4288 return copy_access_posix_acl(conn, name, name, mode);
4289 }
4290
4291 /****************************************************************************
4292 Check for an existing default POSIX ACL on a directory.
4293 ****************************************************************************/
4294
4295 static bool directory_has_default_posix_acl(connection_struct *conn, const char *fname)
4296 {
4297 SMB_ACL_T def_acl = SMB_VFS_SYS_ACL_GET_FILE( conn, fname, SMB_ACL_TYPE_DEFAULT);
4298 bool has_acl = False;
4299 SMB_ACL_ENTRY_T entry;
4300
4301 if (def_acl != NULL && (SMB_VFS_SYS_ACL_GET_ENTRY(conn, def_acl, SMB_ACL_FIRST_ENTRY, &entry) == 1)) {
4302 has_acl = True;
4303 }
4304
4305 if (def_acl) {
4306 SMB_VFS_SYS_ACL_FREE_ACL(conn, def_acl);
4307 }
4308 return has_acl;
4309 }
4310
4311 /****************************************************************************
4312 If the parent directory has no default ACL but it does have an Access ACL,
4313 inherit this Access ACL to file name.
4314 ****************************************************************************/
4315
4316 int inherit_access_posix_acl(connection_struct *conn, const char *inherit_from_dir,
4317 const char *name, mode_t mode)
4318 {
4319 if (directory_has_default_posix_acl(conn, inherit_from_dir))
4320 return 0;
4321
4322 return copy_access_posix_acl(conn, inherit_from_dir, name, mode);
4323 }
4324
4325 /****************************************************************************
4326 Do an fchmod by setting the ACL USER_OBJ, GROUP_OBJ and OTHER bits in an ACL
4327 and set the mask to rwx. Needed to preserve complex ACLs set by NT.
4328 ****************************************************************************/
4329
4330 int fchmod_acl(files_struct *fsp, mode_t mode)
4331 {
4332 connection_struct *conn = fsp->conn;
4333 SMB_ACL_T posix_acl = NULL;
4334 int ret = -1;
4335
4336 if ((posix_acl = SMB_VFS_SYS_ACL_GET_FD(fsp)) == NULL)
4337 return -1;
4338
4339 if ((ret = chmod_acl_internals(conn, posix_acl, mode)) == -1)
4340 goto done;
4341
4342 ret = SMB_VFS_SYS_ACL_SET_FD(fsp, posix_acl);
4343
4344 done:
4345
4346 SMB_VFS_SYS_ACL_FREE_ACL(conn, posix_acl);
4347 return ret;
4348 }
4349
4350 /****************************************************************************
4351 Map from wire type to permset.
4352 ****************************************************************************/
4353
4354 static bool unix_ex_wire_to_permset(connection_struct *conn, unsigned char wire_perm, SMB_ACL_PERMSET_T *p_permset)
4355 {
4356 if (wire_perm & ~(SMB_POSIX_ACL_READ|SMB_POSIX_ACL_WRITE|SMB_POSIX_ACL_EXECUTE)) {
4357 return False;
4358 }
4359
4360 if (SMB_VFS_SYS_ACL_CLEAR_PERMS(conn, *p_permset) == -1) {
4361 return False;
4362 }
4363
4364 if (wire_perm & SMB_POSIX_ACL_READ) {
4365 if (SMB_VFS_SYS_ACL_ADD_PERM(conn, *p_permset, SMB_ACL_READ) == -1) {
4366 return False;
4367 }
4368 }
4369 if (wire_perm & SMB_POSIX_ACL_WRITE) {
4370 if (SMB_VFS_SYS_ACL_ADD_PERM(conn, *p_permset, SMB_ACL_WRITE) == -1) {
4371 return False;
4372 }
4373 }
4374 if (wire_perm & SMB_POSIX_ACL_EXECUTE) {
4375 if (SMB_VFS_SYS_ACL_ADD_PERM(conn, *p_permset, SMB_ACL_EXECUTE) == -1) {
4376 return False;
4377 }
4378 }
4379 return True;
4380 }
4381
4382 /****************************************************************************
4383 Map from wire type to tagtype.
4384 ****************************************************************************/
4385
4386 static bool unix_ex_wire_to_tagtype(unsigned char wire_tt, SMB_ACL_TAG_T *p_tt)
4387 {
4388 switch (wire_tt) {
4389 case SMB_POSIX_ACL_USER_OBJ:
4390 *p_tt = SMB_ACL_USER_OBJ;
4391 break;
4392 case SMB_POSIX_ACL_USER:
4393 *p_tt = SMB_ACL_USER;
4394 break;
4395 case SMB_POSIX_ACL_GROUP_OBJ:
4396 *p_tt = SMB_ACL_GROUP_OBJ;
4397 break;
4398 case SMB_POSIX_ACL_GROUP:
4399 *p_tt = SMB_ACL_GROUP;
4400 break;
4401 case SMB_POSIX_ACL_MASK:
4402 *p_tt = SMB_ACL_MASK;
4403 break;
4404 case SMB_POSIX_ACL_OTHER:
4405 *p_tt = SMB_ACL_OTHER;
4406 break;
4407 default:
4408 return False;
4409 }
4410 return True;
4411 }
4412
4413 /****************************************************************************
4414 Create a new POSIX acl from wire permissions.
4415 FIXME ! How does the share mask/mode fit into this.... ?
4416 ****************************************************************************/
4417
4418 static SMB_ACL_T create_posix_acl_from_wire(connection_struct *conn, uint16 num_acls, const char *pdata)
4419 {
4420 unsigned int i;
4421 SMB_ACL_T the_acl = SMB_VFS_SYS_ACL_INIT(conn, num_acls);
4422
4423 if (the_acl == NULL) {
4424 return NULL;
4425 }
4426
4427 for (i = 0; i < num_acls; i++) {
4428 SMB_ACL_ENTRY_T the_entry;
4429 SMB_ACL_PERMSET_T the_permset;
4430 SMB_ACL_TAG_T tag_type;
4431
4432 if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &the_acl, &the_entry) == -1) {
4433 DEBUG(0,("create_posix_acl_from_wire: Failed to create entry %u. (%s)\n",
4434 i, strerror(errno) ));
4435 goto fail;
4436 }
4437
4438 if (!unix_ex_wire_to_tagtype(CVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)), &tag_type)) {
4439 DEBUG(0,("create_posix_acl_from_wire: invalid wire tagtype %u on entry %u.\n",
4440 CVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)), i ));
4441 goto fail;
4442 }
4443
4444 if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, the_entry, tag_type) == -1) {
4445 DEBUG(0,("create_posix_acl_from_wire: Failed to set tagtype on entry %u. (%s)\n",
4446 i, strerror(errno) ));
4447 goto fail;
4448 }
4449
4450 /* Get the permset pointer from the new ACL entry. */
4451 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, the_entry, &the_permset) == -1) {
4452 DEBUG(0,("create_posix_acl_from_wire: Failed to get permset on entry %u. (%s)\n",
4453 i, strerror(errno) ));
4454 goto fail;
4455 }
4456
4457 /* Map from wire to permissions. */
4458 if (!unix_ex_wire_to_permset(conn, CVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)+1), &the_permset)) {
4459 DEBUG(0,("create_posix_acl_from_wire: invalid permset %u on entry %u.\n",
4460 CVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE) + 1), i ));
4461 goto fail;
4462 }
4463
4464 /* Now apply to the new ACL entry. */
4465 if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, the_entry, the_permset) == -1) {
4466 DEBUG(0,("create_posix_acl_from_wire: Failed to add permset on entry %u. (%s)\n",
4467 i, strerror(errno) ));
4468 goto fail;
4469 }
4470
4471 if (tag_type == SMB_ACL_USER) {
4472 uint32 uidval = IVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)+2);
4473 uid_t uid = (uid_t)uidval;
4474 if (SMB_VFS_SYS_ACL_SET_QUALIFIER(conn, the_entry,(void *)&uid) == -1) {
4475 DEBUG(0,("create_posix_acl_from_wire: Failed to set uid %u on entry %u. (%s)\n",
4476 (unsigned int)uid, i, strerror(errno) ));
4477 goto fail;
4478 }
4479 }
4480
4481 if (tag_type == SMB_ACL_GROUP) {
4482 uint32 gidval = IVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)+2);
4483 gid_t gid = (uid_t)gidval;
4484 if (SMB_VFS_SYS_ACL_SET_QUALIFIER(conn, the_entry,(void *)&gid) == -1) {
4485 DEBUG(0,("create_posix_acl_from_wire: Failed to set gid %u on entry %u. (%s)\n",
4486 (unsigned int)gid, i, strerror(errno) ));
4487 goto fail;
4488 }
4489 }
4490 }
4491
4492 return the_acl;
4493
4494 fail:
4495
4496 if (the_acl != NULL) {
4497 SMB_VFS_SYS_ACL_FREE_ACL(conn, the_acl);
4498 }
4499 return NULL;
4500 }
4501
4502 /****************************************************************************
4503 Calls from UNIX extensions - Default POSIX ACL set.
4504 If num_def_acls == 0 and not a directory just return. If it is a directory
4505 and num_def_acls == 0 then remove the default acl. Else set the default acl
4506 on the directory.
4507 ****************************************************************************/
4508
4509 bool set_unix_posix_default_acl(connection_struct *conn, const char *fname, const SMB_STRUCT_STAT *psbuf,
4510 uint16 num_def_acls, const char *pdata)
4511 {
4512 SMB_ACL_T def_acl = NULL;
4513
4514 if (!S_ISDIR(psbuf->st_ex_mode)) {
4515 if (num_def_acls) {
4516 DEBUG(5,("set_unix_posix_default_acl: Can't set default ACL on non-directory file %s\n", fname ));
4517 errno = EISDIR;
4518 return False;
4519 } else {
4520 return True;
4521 }
4522 }
4523
4524 if (!num_def_acls) {
4525 /* Remove the default ACL. */
4526 if (SMB_VFS_SYS_ACL_DELETE_DEF_FILE(conn, fname) == -1) {
4527 DEBUG(5,("set_unix_posix_default_acl: acl_delete_def_file failed on directory %s (%s)\n",
4528 fname, strerror(errno) ));
4529 return False;
4530 }
4531 return True;
4532 }
4533
4534 if ((def_acl = create_posix_acl_from_wire(conn, num_def_acls, pdata)) == NULL) {
4535 return False;
4536 }
4537
4538 if (SMB_VFS_SYS_ACL_SET_FILE(conn, fname, SMB_ACL_TYPE_DEFAULT, def_acl) == -1) {
4539 DEBUG(5,("set_unix_posix_default_acl: acl_set_file failed on directory %s (%s)\n",
4540 fname, strerror(errno) ));
4541 SMB_VFS_SYS_ACL_FREE_ACL(conn, def_acl);
4542 return False;
4543 }
4544
4545 DEBUG(10,("set_unix_posix_default_acl: set default acl for file %s\n", fname ));
4546 SMB_VFS_SYS_ACL_FREE_ACL(conn, def_acl);
4547 return True;
4548 }
4549
4550 /****************************************************************************
4551 Remove an ACL from a file. As we don't have acl_delete_entry() available
4552 we must read the current acl and copy all entries except MASK, USER and GROUP
4553 to a new acl, then set that. This (at least on Linux) causes any ACL to be
4554 removed.
4555 FIXME ! How does the share mask/mode fit into this.... ?
4556 ****************************************************************************/
4557
4558 static bool remove_posix_acl(connection_struct *conn, files_struct *fsp, const char *fname)
4559 {
4560 SMB_ACL_T file_acl = NULL;
4561 int entry_id = SMB_ACL_FIRST_ENTRY;
4562 SMB_ACL_ENTRY_T entry;
4563 bool ret = False;
4564 /* Create a new ACL with only 3 entries, u/g/w. */
4565 SMB_ACL_T new_file_acl = SMB_VFS_SYS_ACL_INIT(conn, 3);
4566 SMB_ACL_ENTRY_T user_ent = NULL;
4567 SMB_ACL_ENTRY_T group_ent = NULL;
4568 SMB_ACL_ENTRY_T other_ent = NULL;
4569
4570 if (new_file_acl == NULL) {
4571 DEBUG(5,("remove_posix_acl: failed to init new ACL with 3 entries for file %s.\n", fname));
4572 return False;
4573 }
4574
4575 /* Now create the u/g/w entries. */
4576 if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &new_file_acl, &user_ent) == -1) {
4577 DEBUG(5,("remove_posix_acl: Failed to create user entry for file %s. (%s)\n",
4578 fname, strerror(errno) ));
4579 goto done;
4580 }
4581 if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, user_ent, SMB_ACL_USER_OBJ) == -1) {
4582 DEBUG(5,("remove_posix_acl: Failed to set user entry for file %s. (%s)\n",
4583 fname, strerror(errno) ));
4584 goto done;
4585 }
4586
4587 if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &new_file_acl, &group_ent) == -1) {
4588 DEBUG(5,("remove_posix_acl: Failed to create group entry for file %s. (%s)\n",
4589 fname, strerror(errno) ));
4590 goto done;
4591 }
4592 if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, group_ent, SMB_ACL_GROUP_OBJ) == -1) {
4593 DEBUG(5,("remove_posix_acl: Failed to set group entry for file %s. (%s)\n",
4594 fname, strerror(errno) ));
4595 goto done;
4596 }
4597
4598 if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &new_file_acl, &other_ent) == -1) {
4599 DEBUG(5,("remove_posix_acl: Failed to create other entry for file %s. (%s)\n",
4600 fname, strerror(errno) ));
4601 goto done;
4602 }
4603 if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, other_ent, SMB_ACL_OTHER) == -1) {
4604 DEBUG(5,("remove_posix_acl: Failed to set other entry for file %s. (%s)\n",
4605 fname, strerror(errno) ));
4606 goto done;
4607 }
4608
4609 /* Get the current file ACL. */
4610 if (fsp && fsp->fh->fd != -1) {
4611 file_acl = SMB_VFS_SYS_ACL_GET_FD(fsp);
4612 } else {
4613 file_acl = SMB_VFS_SYS_ACL_GET_FILE( conn, fname, SMB_ACL_TYPE_ACCESS);
4614 }
4615
4616 if (file_acl == NULL) {
4617 /* This is only returned if an error occurred. Even for a file with
4618 no acl a u/g/w acl should be returned. */
4619 DEBUG(5,("remove_posix_acl: failed to get ACL from file %s (%s).\n",
4620 fname, strerror(errno) ));
4621 goto done;
4622 }
4623
4624 while ( SMB_VFS_SYS_ACL_GET_ENTRY(conn, file_acl, entry_id, &entry) == 1) {
4625 SMB_ACL_TAG_T tagtype;
4626 SMB_ACL_PERMSET_T permset;
4627
4628 entry_id = SMB_ACL_NEXT_ENTRY;
4629
4630 if (SMB_VFS_SYS_ACL_GET_TAG_TYPE(conn, entry, &tagtype) == -1) {
4631 DEBUG(5,("remove_posix_acl: failed to get tagtype from ACL on file %s (%s).\n",
4632 fname, strerror(errno) ));
4633 goto done;
4634 }
4635
4636 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, entry, &permset) == -1) {
4637 DEBUG(5,("remove_posix_acl: failed to get permset from ACL on file %s (%s).\n",
4638 fname, strerror(errno) ));
4639 goto done;
4640 }
4641
4642 if (tagtype == SMB_ACL_USER_OBJ) {
4643 if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, user_ent, permset) == -1) {
4644 DEBUG(5,("remove_posix_acl: failed to set permset from ACL on file %s (%s).\n",
4645 fname, strerror(errno) ));
4646 }
4647 } else if (tagtype == SMB_ACL_GROUP_OBJ) {
4648 if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, group_ent, permset) == -1) {
4649 DEBUG(5,("remove_posix_acl: failed to set permset from ACL on file %s (%s).\n",
4650 fname, strerror(errno) ));
4651 }
4652 } else if (tagtype == SMB_ACL_OTHER) {
4653 if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, other_ent, permset) == -1) {
4654 DEBUG(5,("remove_posix_acl: failed to set permset from ACL on file %s (%s).\n",
4655 fname, strerror(errno) ));
4656 }
4657 }
4658 }
4659
4660 /* Set the new empty file ACL. */
4661 if (fsp && fsp->fh->fd != -1) {
4662 if (SMB_VFS_SYS_ACL_SET_FD(fsp, new_file_acl) == -1) {
4663 DEBUG(5,("remove_posix_acl: acl_set_file failed on %s (%s)\n",
4664 fname, strerror(errno) ));
4665 goto done;
4666 }
4667 } else {
4668 if (SMB_VFS_SYS_ACL_SET_FILE(conn, fname, SMB_ACL_TYPE_ACCESS, new_file_acl) == -1) {
4669 DEBUG(5,("remove_posix_acl: acl_set_file failed on %s (%s)\n",
4670 fname, strerror(errno) ));
4671 goto done;
4672 }
4673 }
4674
4675 ret = True;
4676
4677 done:
4678
4679 if (file_acl) {
4680 SMB_VFS_SYS_ACL_FREE_ACL(conn, file_acl);
4681 }
4682 if (new_file_acl) {
4683 SMB_VFS_SYS_ACL_FREE_ACL(conn, new_file_acl);
4684 }
4685 return ret;
4686 }
4687
4688 /****************************************************************************
4689 Calls from UNIX extensions - POSIX ACL set.
4690 If num_def_acls == 0 then read/modify/write acl after removing all entries
4691 except SMB_ACL_USER_OBJ, SMB_ACL_GROUP_OBJ, SMB_ACL_OTHER.
4692 ****************************************************************************/
4693
4694 bool set_unix_posix_acl(connection_struct *conn, files_struct *fsp, const char *fname, uint16 num_acls, const char *pdata)
4695 {
4696 SMB_ACL_T file_acl = NULL;
4697
4698 if (!num_acls) {
4699 /* Remove the ACL from the file. */
4700 return remove_posix_acl(conn, fsp, fname);
4701 }
4702
4703 if ((file_acl = create_posix_acl_from_wire(conn, num_acls, pdata)) == NULL) {
4704 return False;
4705 }
4706
4707 if (fsp && fsp->fh->fd != -1) {
4708 /* The preferred way - use an open fd. */
4709 if (SMB_VFS_SYS_ACL_SET_FD(fsp, file_acl) == -1) {
4710 DEBUG(5,("set_unix_posix_acl: acl_set_file failed on %s (%s)\n",
4711 fname, strerror(errno) ));
4712 SMB_VFS_SYS_ACL_FREE_ACL(conn, file_acl);
4713 return False;
4714 }
4715 } else {
4716 if (SMB_VFS_SYS_ACL_SET_FILE(conn, fname, SMB_ACL_TYPE_ACCESS, file_acl) == -1) {
4717 DEBUG(5,("set_unix_posix_acl: acl_set_file failed on %s (%s)\n",
4718 fname, strerror(errno) ));
4719 SMB_VFS_SYS_ACL_FREE_ACL(conn, file_acl);
4720 return False;
4721 }
4722 }
4723
4724 DEBUG(10,("set_unix_posix_acl: set acl for file %s\n", fname ));
4725 SMB_VFS_SYS_ACL_FREE_ACL(conn, file_acl);
4726 return True;
4727 }
4728
4729 /********************************************************************
4730 Pull the NT ACL from a file on disk or the OpenEventlog() access
4731 check. Caller is responsible for freeing the returned security
4732 descriptor via TALLOC_FREE(). This is designed for dealing with
4733 user space access checks in smbd outside of the VFS. For example,
4734 checking access rights in OpenEventlog().
4735
4736 Assume we are dealing with files (for now)
4737 ********************************************************************/
4738
4739 struct security_descriptor *get_nt_acl_no_snum( TALLOC_CTX *ctx, const char *fname)
4740 {
4741 struct security_descriptor *psd, *ret_sd;
4742 connection_struct *conn;
4743 files_struct finfo;
4744 struct fd_handle fh;
4745 NTSTATUS status;
4746
4747 conn = talloc_zero(ctx, connection_struct);
4748 if (conn == NULL) {
4749 DEBUG(0, ("talloc failed\n"));
4750 return NULL;
4751 }
4752
4753 if (!(conn->params = talloc(conn, struct share_params))) {
4754 DEBUG(0,("get_nt_acl_no_snum: talloc() failed!\n"));
4755 TALLOC_FREE(conn);
4756 return NULL;
4757 }
4758
4759 conn->params->service = -1;
4760
4761 set_conn_connectpath(conn, "/");
4762
4763 if (!smbd_vfs_init(conn)) {
4764 DEBUG(0,("get_nt_acl_no_snum: Unable to create a fake connection struct!\n"));
4765 conn_free(conn);
4766 return NULL;
4767 }
4768
4769 ZERO_STRUCT( finfo );
4770 ZERO_STRUCT( fh );
4771
4772 finfo.fnum = -1;
4773 finfo.conn = conn;
4774 finfo.fh = &fh;
4775 finfo.fh->fd = -1;
4776
4777 status = create_synthetic_smb_fname(talloc_tos(), fname, NULL, NULL,
4778 &finfo.fsp_name);
4779 if (!NT_STATUS_IS_OK(status)) {
4780 conn_free(conn);
4781 return NULL;
4782 }
4783
4784 if (!NT_STATUS_IS_OK(SMB_VFS_FGET_NT_ACL( &finfo, SECINFO_DACL, &psd))) {
4785 DEBUG(0,("get_nt_acl_no_snum: get_nt_acl returned zero.\n"));
4786 TALLOC_FREE(finfo.fsp_name);
4787 conn_free(conn);
4788 return NULL;
4789 }
4790
4791 ret_sd = dup_sec_desc( ctx, psd );
4792
4793 TALLOC_FREE(finfo.fsp_name);
4794 conn_free(conn);
4795
4796 return ret_sd;
4797 }
4798
4799 /* Stolen shamelessly from pvfs_default_acl() in source4 :-). */
4800
4801 NTSTATUS make_default_filesystem_acl(TALLOC_CTX *ctx,
4802 const char *name,
4803 SMB_STRUCT_STAT *psbuf,
4804 struct security_descriptor **ppdesc)
4805 {
4806 struct dom_sid owner_sid, group_sid;
4807 size_t size = 0;
4808 struct security_ace aces[4];
4809 uint32_t access_mask = 0;
4810 mode_t mode = psbuf->st_ex_mode;
4811 struct security_acl *new_dacl = NULL;
4812 int idx = 0;
4813
4814 DEBUG(10,("make_default_filesystem_acl: file %s mode = 0%o\n",
4815 name, (int)mode ));
4816
4817 uid_to_sid(&owner_sid, psbuf->st_ex_uid);
4818 gid_to_sid(&group_sid, psbuf->st_ex_gid);
4819
4820 /*
4821 We provide up to 4 ACEs
4822 - Owner
4823 - Group
4824 - Everyone
4825 - NT System
4826 */
4827
4828 if (mode & S_IRUSR) {
4829 if (mode & S_IWUSR) {
4830 access_mask |= SEC_RIGHTS_FILE_ALL;
4831 } else {
4832 access_mask |= SEC_RIGHTS_FILE_READ | SEC_FILE_EXECUTE;
4833 }
4834 }
4835 if (mode & S_IWUSR) {
4836 access_mask |= SEC_RIGHTS_FILE_WRITE | SEC_STD_DELETE;
4837 }
4838
4839 init_sec_ace(&aces[idx],
4840 &owner_sid,
4841 SEC_ACE_TYPE_ACCESS_ALLOWED,
4842 access_mask,
4843 0);
4844 idx++;
4845
4846 access_mask = 0;
4847 if (mode & S_IRGRP) {
4848 access_mask |= SEC_RIGHTS_FILE_READ | SEC_FILE_EXECUTE;
4849 }
4850 if (mode & S_IWGRP) {
4851 /* note that delete is not granted - this matches posix behaviour */
4852 access_mask |= SEC_RIGHTS_FILE_WRITE;
4853 }
4854 if (access_mask) {
4855 init_sec_ace(&aces[idx],
4856 &group_sid,
4857 SEC_ACE_TYPE_ACCESS_ALLOWED,
4858 access_mask,
4859 0);
4860 idx++;
4861 }
4862
4863 access_mask = 0;
4864 if (mode & S_IROTH) {
4865 access_mask |= SEC_RIGHTS_FILE_READ | SEC_FILE_EXECUTE;
4866 }
4867 if (mode & S_IWOTH) {
4868 access_mask |= SEC_RIGHTS_FILE_WRITE;
4869 }
4870 if (access_mask) {
4871 init_sec_ace(&aces[idx],
4872 &global_sid_World,
4873 SEC_ACE_TYPE_ACCESS_ALLOWED,
4874 access_mask,
4875 0);
4876 idx++;
4877 }
4878
4879 init_sec_ace(&aces[idx],
4880 &global_sid_System,
4881 SEC_ACE_TYPE_ACCESS_ALLOWED,
4882 SEC_RIGHTS_FILE_ALL,
4883 0);
4884 idx++;
4885
4886 new_dacl = make_sec_acl(ctx,
4887 NT4_ACL_REVISION,
4888 idx,
4889 aces);
4890
4891 if (!new_dacl) {
4892 return NT_STATUS_NO_MEMORY;
4893 }
4894
4895 *ppdesc = make_sec_desc(ctx,
4896 SECURITY_DESCRIPTOR_REVISION_1,
4897 SEC_DESC_SELF_RELATIVE|SEC_DESC_DACL_PRESENT,
4898 &owner_sid,
4899 &group_sid,
4900 NULL,
4901 new_dacl,
4902 &size);
4903 if (!*ppdesc) {
4904 return NT_STATUS_NO_MEMORY;
4905 }
4906 return NT_STATUS_OK;
4907 }
reg import