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s4:torture: Remove unused header file
[Samba.git] / source3 / smbd / posix_acls.c
blob59cd020dbeda9d15f748198a620038bcf59d8e78
1 /*
2 Unix SMB/CIFS implementation.
3 SMB NT Security Descriptor / Unix permission conversion.
4 Copyright (C) Jeremy Allison 1994-2009.
5 Copyright (C) Andreas Gruenbacher 2002.
6 Copyright (C) Simo Sorce <idra@samba.org> 2009.
7
8 This program is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 3 of the License, or
11 (at your option) any later version.
12
13 This program is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
17
18 You should have received a copy of the GNU General Public License
19 along with this program. If not, see <http://www.gnu.org/licenses/>.
20 */
21
22 #include "includes.h"
23 #include "smbd/smbd.h"
24 #include "system/filesys.h"
25 #include "../libcli/security/security.h"
26 #include "trans2.h"
27 #include "passdb/lookup_sid.h"
28 #include "auth.h"
29 #include "../librpc/gen_ndr/idmap.h"
30 #include "../librpc/gen_ndr/ndr_smb_acl.h"
31 #include "lib/param/loadparm.h"
32
33 extern const struct generic_mapping file_generic_mapping;
34
35 #undef DBGC_CLASS
36 #define DBGC_CLASS DBGC_ACLS
37
38 /****************************************************************************
39 Data structures representing the internal ACE format.
40 ****************************************************************************/
41
42 enum ace_owner {UID_ACE, GID_ACE, WORLD_ACE};
43 enum ace_attribute {ALLOW_ACE, DENY_ACE}; /* Used for incoming NT ACLS. */
44
45 typedef struct canon_ace {
46 struct canon_ace *next, *prev;
47 SMB_ACL_TAG_T type;
48 mode_t perms; /* Only use S_I(R|W|X)USR mode bits here. */
49 struct dom_sid trustee;
50 enum ace_owner owner_type;
51 enum ace_attribute attr;
52 struct unixid unix_ug;
53 uint8_t ace_flags; /* From windows ACE entry. */
54 } canon_ace;
55
56 #define ALL_ACE_PERMS (S_IRUSR|S_IWUSR|S_IXUSR)
57
58 /*
59 * EA format of user.SAMBA_PAI (Samba_Posix_Acl_Interitance)
60 * attribute on disk - version 1.
61 * All values are little endian.
62 *
63 * | 1 | 1 | 2 | 2 | ....
64 * +------+------+-------------+---------------------+-------------+--------------------+
65 * | vers | flag | num_entries | num_default_entries | ..entries.. | default_entries... |
66 * +------+------+-------------+---------------------+-------------+--------------------+
67 *
68 * Entry format is :
69 *
70 * | 1 | 4 |
71 * +------+-------------------+
72 * | value| uid/gid or world |
73 * | type | value |
74 * +------+-------------------+
75 *
76 * Version 2 format. Stores extra Windows metadata about an ACL.
77 *
78 * | 1 | 2 | 2 | 2 | ....
79 * +------+----------+-------------+---------------------+-------------+--------------------+
80 * | vers | ace | num_entries | num_default_entries | ..entries.. | default_entries... |
81 * | 2 | type | | | | |
82 * +------+----------+-------------+---------------------+-------------+--------------------+
83 *
84 * Entry format is :
85 *
86 * | 1 | 1 | 4 |
87 * +------+------+-------------------+
88 * | ace | value| uid/gid or world |
89 * | flag | type | value |
90 * +------+-------------------+------+
91 *
92 */
93
94 #define PAI_VERSION_OFFSET 0
95
96 #define PAI_V1_FLAG_OFFSET 1
97 #define PAI_V1_NUM_ENTRIES_OFFSET 2
98 #define PAI_V1_NUM_DEFAULT_ENTRIES_OFFSET 4
99 #define PAI_V1_ENTRIES_BASE 6
100 #define PAI_V1_ACL_FLAG_PROTECTED 0x1
101 #define PAI_V1_ENTRY_LENGTH 5
102
103 #define PAI_V1_VERSION 1
104
105 #define PAI_V2_TYPE_OFFSET 1
106 #define PAI_V2_NUM_ENTRIES_OFFSET 3
107 #define PAI_V2_NUM_DEFAULT_ENTRIES_OFFSET 5
108 #define PAI_V2_ENTRIES_BASE 7
109 #define PAI_V2_ENTRY_LENGTH 6
110
111 #define PAI_V2_VERSION 2
112
113 /*
114 * In memory format of user.SAMBA_PAI attribute.
115 */
116
117 struct pai_entry {
118 struct pai_entry *next, *prev;
119 uint8_t ace_flags;
120 enum ace_owner owner_type;
121 struct unixid unix_ug;
122 };
123
124 struct pai_val {
125 uint16_t sd_type;
126 unsigned int num_entries;
127 struct pai_entry *entry_list;
128 unsigned int num_def_entries;
129 struct pai_entry *def_entry_list;
130 };
131
132 /************************************************************************
133 Return a uint32_t of the pai_entry principal.
134 ************************************************************************/
135
136 static uint32_t get_pai_entry_val(struct pai_entry *paie)
137 {
138 switch (paie->owner_type) {
139 case UID_ACE:
140 DEBUG(10,("get_pai_entry_val: uid = %u\n", (unsigned int)paie->unix_ug.id ));
141 return (uint32_t)paie->unix_ug.id;
142 case GID_ACE:
143 DEBUG(10,("get_pai_entry_val: gid = %u\n", (unsigned int)paie->unix_ug.id ));
144 return (uint32_t)paie->unix_ug.id;
145 case WORLD_ACE:
146 default:
147 DEBUG(10,("get_pai_entry_val: world ace\n"));
148 return (uint32_t)-1;
149 }
150 }
151
152 /************************************************************************
153 Return a uint32_t of the entry principal.
154 ************************************************************************/
155
156 static uint32_t get_entry_val(canon_ace *ace_entry)
157 {
158 switch (ace_entry->owner_type) {
159 case UID_ACE:
160 DEBUG(10,("get_entry_val: uid = %u\n", (unsigned int)ace_entry->unix_ug.id ));
161 return (uint32_t)ace_entry->unix_ug.id;
162 case GID_ACE:
163 DEBUG(10,("get_entry_val: gid = %u\n", (unsigned int)ace_entry->unix_ug.id ));
164 return (uint32_t)ace_entry->unix_ug.id;
165 case WORLD_ACE:
166 default:
167 DEBUG(10,("get_entry_val: world ace\n"));
168 return (uint32_t)-1;
169 }
170 }
171
172 /************************************************************************
173 Create the on-disk format (always v2 now). Caller must free.
174 ************************************************************************/
175
176 static char *create_pai_buf_v2(canon_ace *file_ace_list,
177 canon_ace *dir_ace_list,
178 uint16_t sd_type,
179 size_t *store_size)
180 {
181 char *pai_buf = NULL;
182 canon_ace *ace_list = NULL;
183 char *entry_offset = NULL;
184 unsigned int num_entries = 0;
185 unsigned int num_def_entries = 0;
186 unsigned int i;
187
188 for (ace_list = file_ace_list; ace_list; ace_list = ace_list->next) {
189 num_entries++;
190 }
191
192 for (ace_list = dir_ace_list; ace_list; ace_list = ace_list->next) {
193 num_def_entries++;
194 }
195
196 DEBUG(10,("create_pai_buf_v2: num_entries = %u, num_def_entries = %u\n", num_entries, num_def_entries ));
197
198 *store_size = PAI_V2_ENTRIES_BASE +
199 ((num_entries + num_def_entries)*PAI_V2_ENTRY_LENGTH);
200
201 pai_buf = talloc_array(talloc_tos(), char, *store_size);
202 if (!pai_buf) {
203 return NULL;
204 }
205
206 /* Set up the header. */
207 memset(pai_buf, '\0', PAI_V2_ENTRIES_BASE);
208 SCVAL(pai_buf,PAI_VERSION_OFFSET,PAI_V2_VERSION);
209 SSVAL(pai_buf,PAI_V2_TYPE_OFFSET, sd_type);
210 SSVAL(pai_buf,PAI_V2_NUM_ENTRIES_OFFSET,num_entries);
211 SSVAL(pai_buf,PAI_V2_NUM_DEFAULT_ENTRIES_OFFSET,num_def_entries);
212
213 DEBUG(10,("create_pai_buf_v2: sd_type = 0x%x\n",
214 (unsigned int)sd_type ));
215
216 entry_offset = pai_buf + PAI_V2_ENTRIES_BASE;
217
218 i = 0;
219 for (ace_list = file_ace_list; ace_list; ace_list = ace_list->next) {
220 uint8_t type_val = (uint8_t)ace_list->owner_type;
221 uint32_t entry_val = get_entry_val(ace_list);
222
223 SCVAL(entry_offset,0,ace_list->ace_flags);
224 SCVAL(entry_offset,1,type_val);
225 SIVAL(entry_offset,2,entry_val);
226 DEBUG(10,("create_pai_buf_v2: entry %u [0x%x] [0x%x] [0x%x]\n",
227 i,
228 (unsigned int)ace_list->ace_flags,
229 (unsigned int)type_val,
230 (unsigned int)entry_val ));
231 i++;
232 entry_offset += PAI_V2_ENTRY_LENGTH;
233 }
234
235 for (ace_list = dir_ace_list; ace_list; ace_list = ace_list->next) {
236 uint8_t type_val = (uint8_t)ace_list->owner_type;
237 uint32_t entry_val = get_entry_val(ace_list);
238
239 SCVAL(entry_offset,0,ace_list->ace_flags);
240 SCVAL(entry_offset,1,type_val);
241 SIVAL(entry_offset,2,entry_val);
242 DEBUG(10,("create_pai_buf_v2: entry %u [0x%x] [0x%x] [0x%x]\n",
243 i,
244 (unsigned int)ace_list->ace_flags,
245 (unsigned int)type_val,
246 (unsigned int)entry_val ));
247 i++;
248 entry_offset += PAI_V2_ENTRY_LENGTH;
249 }
250
251 return pai_buf;
252 }
253
254 /************************************************************************
255 Store the user.SAMBA_PAI attribute on disk.
256 ************************************************************************/
257
258 static void store_inheritance_attributes(files_struct *fsp,
259 canon_ace *file_ace_list,
260 canon_ace *dir_ace_list,
261 uint16_t sd_type)
262 {
263 int ret;
264 size_t store_size;
265 char *pai_buf;
266
267 if (!lp_map_acl_inherit(SNUM(fsp->conn))) {
268 return;
269 }
270
271 pai_buf = create_pai_buf_v2(file_ace_list, dir_ace_list,
272 sd_type, &store_size);
273
274 if (fsp->fh->fd != -1) {
275 ret = SMB_VFS_FSETXATTR(fsp, SAMBA_POSIX_INHERITANCE_EA_NAME,
276 pai_buf, store_size, 0);
277 } else {
278 ret = SMB_VFS_SETXATTR(fsp->conn, fsp->fsp_name,
279 SAMBA_POSIX_INHERITANCE_EA_NAME,
280 pai_buf, store_size, 0);
281 }
282
283 TALLOC_FREE(pai_buf);
284
285 DEBUG(10,("store_inheritance_attribute: type 0x%x for file %s\n",
286 (unsigned int)sd_type,
287 fsp_str_dbg(fsp)));
288
289 if (ret == -1 && !no_acl_syscall_error(errno)) {
290 DEBUG(1,("store_inheritance_attribute: Error %s\n", strerror(errno) ));
291 }
292 }
293
294 /************************************************************************
295 Delete the in memory inheritance info.
296 ************************************************************************/
297
298 static void free_inherited_info(struct pai_val *pal)
299 {
300 if (pal) {
301 struct pai_entry *paie, *paie_next;
302 for (paie = pal->entry_list; paie; paie = paie_next) {
303 paie_next = paie->next;
304 TALLOC_FREE(paie);
305 }
306 for (paie = pal->def_entry_list; paie; paie = paie_next) {
307 paie_next = paie->next;
308 TALLOC_FREE(paie);
309 }
310 TALLOC_FREE(pal);
311 }
312 }
313
314 /************************************************************************
315 Get any stored ACE flags.
316 ************************************************************************/
317
318 static uint16_t get_pai_flags(struct pai_val *pal, canon_ace *ace_entry, bool default_ace)
319 {
320 struct pai_entry *paie;
321
322 if (!pal) {
323 return 0;
324 }
325
326 /* If the entry exists it is inherited. */
327 for (paie = (default_ace ? pal->def_entry_list : pal->entry_list); paie; paie = paie->next) {
328 if (ace_entry->owner_type == paie->owner_type &&
329 get_entry_val(ace_entry) == get_pai_entry_val(paie))
330 return paie->ace_flags;
331 }
332 return 0;
333 }
334
335 /************************************************************************
336 Ensure an attribute just read is valid - v1.
337 ************************************************************************/
338
339 static bool check_pai_ok_v1(const char *pai_buf, size_t pai_buf_data_size)
340 {
341 uint16_t num_entries;
342 uint16_t num_def_entries;
343
344 if (pai_buf_data_size < PAI_V1_ENTRIES_BASE) {
345 /* Corrupted - too small. */
346 return false;
347 }
348
349 if (CVAL(pai_buf,PAI_VERSION_OFFSET) != PAI_V1_VERSION) {
350 return false;
351 }
352
353 num_entries = SVAL(pai_buf,PAI_V1_NUM_ENTRIES_OFFSET);
354 num_def_entries = SVAL(pai_buf,PAI_V1_NUM_DEFAULT_ENTRIES_OFFSET);
355
356 /* Check the entry lists match. */
357 /* Each entry is 5 bytes (type plus 4 bytes of uid or gid). */
358
359 if (((num_entries + num_def_entries)*PAI_V1_ENTRY_LENGTH) +
360 PAI_V1_ENTRIES_BASE != pai_buf_data_size) {
361 return false;
362 }
363
364 return true;
365 }
366
367 /************************************************************************
368 Ensure an attribute just read is valid - v2.
369 ************************************************************************/
370
371 static bool check_pai_ok_v2(const char *pai_buf, size_t pai_buf_data_size)
372 {
373 uint16_t num_entries;
374 uint16_t num_def_entries;
375
376 if (pai_buf_data_size < PAI_V2_ENTRIES_BASE) {
377 /* Corrupted - too small. */
378 return false;
379 }
380
381 if (CVAL(pai_buf,PAI_VERSION_OFFSET) != PAI_V2_VERSION) {
382 return false;
383 }
384
385 num_entries = SVAL(pai_buf,PAI_V2_NUM_ENTRIES_OFFSET);
386 num_def_entries = SVAL(pai_buf,PAI_V2_NUM_DEFAULT_ENTRIES_OFFSET);
387
388 /* Check the entry lists match. */
389 /* Each entry is 6 bytes (flags + type + 4 bytes of uid or gid). */
390
391 if (((num_entries + num_def_entries)*PAI_V2_ENTRY_LENGTH) +
392 PAI_V2_ENTRIES_BASE != pai_buf_data_size) {
393 return false;
394 }
395
396 return true;
397 }
398
399 /************************************************************************
400 Decode the owner.
401 ************************************************************************/
402
403 static bool get_pai_owner_type(struct pai_entry *paie, const char *entry_offset)
404 {
405 paie->owner_type = (enum ace_owner)CVAL(entry_offset,0);
406 switch( paie->owner_type) {
407 case UID_ACE:
408 paie->unix_ug.type = ID_TYPE_UID;
409 paie->unix_ug.id = (uid_t)IVAL(entry_offset,1);
410 DEBUG(10,("get_pai_owner_type: uid = %u\n",
411 (unsigned int)paie->unix_ug.id ));
412 break;
413 case GID_ACE:
414 paie->unix_ug.type = ID_TYPE_GID;
415 paie->unix_ug.id = (gid_t)IVAL(entry_offset,1);
416 DEBUG(10,("get_pai_owner_type: gid = %u\n",
417 (unsigned int)paie->unix_ug.id ));
418 break;
419 case WORLD_ACE:
420 paie->unix_ug.type = ID_TYPE_NOT_SPECIFIED;
421 paie->unix_ug.id = -1;
422 DEBUG(10,("get_pai_owner_type: world ace\n"));
423 break;
424 default:
425 DEBUG(10,("get_pai_owner_type: unknown type %u\n",
426 (unsigned int)paie->owner_type ));
427 return false;
428 }
429 return true;
430 }
431
432 /************************************************************************
433 Process v2 entries.
434 ************************************************************************/
435
436 static const char *create_pai_v1_entries(struct pai_val *paiv,
437 const char *entry_offset,
438 bool def_entry)
439 {
440 unsigned int i;
441
442 for (i = 0; i < paiv->num_entries; i++) {
443 struct pai_entry *paie = talloc(talloc_tos(), struct pai_entry);
444 if (!paie) {
445 return NULL;
446 }
447
448 paie->ace_flags = SEC_ACE_FLAG_INHERITED_ACE;
449 if (!get_pai_owner_type(paie, entry_offset)) {
450 TALLOC_FREE(paie);
451 return NULL;
452 }
453
454 if (!def_entry) {
455 DLIST_ADD(paiv->entry_list, paie);
456 } else {
457 DLIST_ADD(paiv->def_entry_list, paie);
458 }
459 entry_offset += PAI_V1_ENTRY_LENGTH;
460 }
461 return entry_offset;
462 }
463
464 /************************************************************************
465 Convert to in-memory format from version 1.
466 ************************************************************************/
467
468 static struct pai_val *create_pai_val_v1(const char *buf, size_t size)
469 {
470 const char *entry_offset;
471 struct pai_val *paiv = NULL;
472
473 if (!check_pai_ok_v1(buf, size)) {
474 return NULL;
475 }
476
477 paiv = talloc(talloc_tos(), struct pai_val);
478 if (!paiv) {
479 return NULL;
480 }
481
482 memset(paiv, '\0', sizeof(struct pai_val));
483
484 paiv->sd_type = (CVAL(buf,PAI_V1_FLAG_OFFSET) == PAI_V1_ACL_FLAG_PROTECTED) ?
485 SEC_DESC_DACL_PROTECTED : 0;
486
487 paiv->num_entries = SVAL(buf,PAI_V1_NUM_ENTRIES_OFFSET);
488 paiv->num_def_entries = SVAL(buf,PAI_V1_NUM_DEFAULT_ENTRIES_OFFSET);
489
490 entry_offset = buf + PAI_V1_ENTRIES_BASE;
491
492 DEBUG(10,("create_pai_val: num_entries = %u, num_def_entries = %u\n",
493 paiv->num_entries, paiv->num_def_entries ));
494
495 entry_offset = create_pai_v1_entries(paiv, entry_offset, false);
496 if (entry_offset == NULL) {
497 free_inherited_info(paiv);
498 return NULL;
499 }
500 entry_offset = create_pai_v1_entries(paiv, entry_offset, true);
501 if (entry_offset == NULL) {
502 free_inherited_info(paiv);
503 return NULL;
504 }
505
506 return paiv;
507 }
508
509 /************************************************************************
510 Process v2 entries.
511 ************************************************************************/
512
513 static const char *create_pai_v2_entries(struct pai_val *paiv,
514 unsigned int num_entries,
515 const char *entry_offset,
516 bool def_entry)
517 {
518 unsigned int i;
519
520 for (i = 0; i < num_entries; i++) {
521 struct pai_entry *paie = talloc(talloc_tos(), struct pai_entry);
522 if (!paie) {
523 return NULL;
524 }
525
526 paie->ace_flags = CVAL(entry_offset,0);
527
528 if (!get_pai_owner_type(paie, entry_offset+1)) {
529 TALLOC_FREE(paie);
530 return NULL;
531 }
532 if (!def_entry) {
533 DLIST_ADD(paiv->entry_list, paie);
534 } else {
535 DLIST_ADD(paiv->def_entry_list, paie);
536 }
537 entry_offset += PAI_V2_ENTRY_LENGTH;
538 }
539 return entry_offset;
540 }
541
542 /************************************************************************
543 Convert to in-memory format from version 2.
544 ************************************************************************/
545
546 static struct pai_val *create_pai_val_v2(const char *buf, size_t size)
547 {
548 const char *entry_offset;
549 struct pai_val *paiv = NULL;
550
551 if (!check_pai_ok_v2(buf, size)) {
552 return NULL;
553 }
554
555 paiv = talloc(talloc_tos(), struct pai_val);
556 if (!paiv) {
557 return NULL;
558 }
559
560 memset(paiv, '\0', sizeof(struct pai_val));
561
562 paiv->sd_type = SVAL(buf,PAI_V2_TYPE_OFFSET);
563
564 paiv->num_entries = SVAL(buf,PAI_V2_NUM_ENTRIES_OFFSET);
565 paiv->num_def_entries = SVAL(buf,PAI_V2_NUM_DEFAULT_ENTRIES_OFFSET);
566
567 entry_offset = buf + PAI_V2_ENTRIES_BASE;
568
569 DEBUG(10,("create_pai_val_v2: sd_type = 0x%x num_entries = %u, num_def_entries = %u\n",
570 (unsigned int)paiv->sd_type,
571 paiv->num_entries, paiv->num_def_entries ));
572
573 entry_offset = create_pai_v2_entries(paiv, paiv->num_entries,
574 entry_offset, false);
575 if (entry_offset == NULL) {
576 free_inherited_info(paiv);
577 return NULL;
578 }
579 entry_offset = create_pai_v2_entries(paiv, paiv->num_def_entries,
580 entry_offset, true);
581 if (entry_offset == NULL) {
582 free_inherited_info(paiv);
583 return NULL;
584 }
585
586 return paiv;
587 }
588
589 /************************************************************************
590 Convert to in-memory format - from either version 1 or 2.
591 ************************************************************************/
592
593 static struct pai_val *create_pai_val(const char *buf, size_t size)
594 {
595 if (size < 1) {
596 return NULL;
597 }
598 if (CVAL(buf,PAI_VERSION_OFFSET) == PAI_V1_VERSION) {
599 return create_pai_val_v1(buf, size);
600 } else if (CVAL(buf,PAI_VERSION_OFFSET) == PAI_V2_VERSION) {
601 return create_pai_val_v2(buf, size);
602 } else {
603 return NULL;
604 }
605 }
606
607 /************************************************************************
608 Load the user.SAMBA_PAI attribute.
609 ************************************************************************/
610
611 static struct pai_val *fload_inherited_info(files_struct *fsp)
612 {
613 char *pai_buf;
614 size_t pai_buf_size = 1024;
615 struct pai_val *paiv = NULL;
616 ssize_t ret;
617
618 if (!lp_map_acl_inherit(SNUM(fsp->conn))) {
619 return NULL;
620 }
621
622 if ((pai_buf = talloc_array(talloc_tos(), char, pai_buf_size)) == NULL) {
623 return NULL;
624 }
625
626 do {
627 if (fsp->fh->fd != -1) {
628 ret = SMB_VFS_FGETXATTR(fsp, SAMBA_POSIX_INHERITANCE_EA_NAME,
629 pai_buf, pai_buf_size);
630 } else {
631 ret = SMB_VFS_GETXATTR(fsp->conn,
632 fsp->fsp_name,
633 SAMBA_POSIX_INHERITANCE_EA_NAME,
634 pai_buf, pai_buf_size);
635 }
636
637 if (ret == -1) {
638 if (errno != ERANGE) {
639 break;
640 }
641 /* Buffer too small - enlarge it. */
642 pai_buf_size *= 2;
643 TALLOC_FREE(pai_buf);
644 if (pai_buf_size > 1024*1024) {
645 return NULL; /* Limit malloc to 1mb. */
646 }
647 if ((pai_buf = talloc_array(talloc_tos(), char, pai_buf_size)) == NULL)
648 return NULL;
649 }
650 } while (ret == -1);
651
652 DEBUG(10,("load_inherited_info: ret = %lu for file %s\n",
653 (unsigned long)ret, fsp_str_dbg(fsp)));
654
655 if (ret == -1) {
656 /* No attribute or not supported. */
657 #if defined(ENOATTR)
658 if (errno != ENOATTR)
659 DEBUG(10,("load_inherited_info: Error %s\n", strerror(errno) ));
660 #else
661 if (errno != ENOSYS)
662 DEBUG(10,("load_inherited_info: Error %s\n", strerror(errno) ));
663 #endif
664 TALLOC_FREE(pai_buf);
665 return NULL;
666 }
667
668 paiv = create_pai_val(pai_buf, ret);
669
670 if (paiv) {
671 DEBUG(10,("load_inherited_info: ACL type is 0x%x for file %s\n",
672 (unsigned int)paiv->sd_type, fsp_str_dbg(fsp)));
673 }
674
675 TALLOC_FREE(pai_buf);
676 return paiv;
677 }
678
679 /************************************************************************
680 Load the user.SAMBA_PAI attribute.
681 ************************************************************************/
682
683 static struct pai_val *load_inherited_info(const struct connection_struct *conn,
684 const struct smb_filename *smb_fname)
685 {
686 char *pai_buf;
687 size_t pai_buf_size = 1024;
688 struct pai_val *paiv = NULL;
689 ssize_t ret;
690
691 if (!lp_map_acl_inherit(SNUM(conn))) {
692 return NULL;
693 }
694
695 if ((pai_buf = talloc_array(talloc_tos(), char, pai_buf_size)) == NULL) {
696 return NULL;
697 }
698
699 do {
700 ret = SMB_VFS_GETXATTR(conn, smb_fname,
701 SAMBA_POSIX_INHERITANCE_EA_NAME,
702 pai_buf, pai_buf_size);
703
704 if (ret == -1) {
705 if (errno != ERANGE) {
706 break;
707 }
708 /* Buffer too small - enlarge it. */
709 pai_buf_size *= 2;
710 TALLOC_FREE(pai_buf);
711 if (pai_buf_size > 1024*1024) {
712 return NULL; /* Limit malloc to 1mb. */
713 }
714 if ((pai_buf = talloc_array(talloc_tos(), char, pai_buf_size)) == NULL)
715 return NULL;
716 }
717 } while (ret == -1);
718
719 DEBUG(10,("load_inherited_info: ret = %lu for file %s\n",
720 (unsigned long)ret, smb_fname->base_name));
721
722 if (ret == -1) {
723 /* No attribute or not supported. */
724 #if defined(ENOATTR)
725 if (errno != ENOATTR)
726 DEBUG(10,("load_inherited_info: Error %s\n", strerror(errno) ));
727 #else
728 if (errno != ENOSYS)
729 DEBUG(10,("load_inherited_info: Error %s\n", strerror(errno) ));
730 #endif
731 TALLOC_FREE(pai_buf);
732 return NULL;
733 }
734
735 paiv = create_pai_val(pai_buf, ret);
736
737 if (paiv) {
738 DEBUG(10,("load_inherited_info: ACL type 0x%x for file %s\n",
739 (unsigned int)paiv->sd_type,
740 smb_fname->base_name));
741 }
742
743 TALLOC_FREE(pai_buf);
744 return paiv;
745 }
746
747 /****************************************************************************
748 Functions to manipulate the internal ACE format.
749 ****************************************************************************/
750
751 /****************************************************************************
752 Count a linked list of canonical ACE entries.
753 ****************************************************************************/
754
755 static size_t count_canon_ace_list( canon_ace *l_head )
756 {
757 size_t count = 0;
758 canon_ace *ace;
759
760 for (ace = l_head; ace; ace = ace->next)
761 count++;
762
763 return count;
764 }
765
766 /****************************************************************************
767 Free a linked list of canonical ACE entries.
768 ****************************************************************************/
769
770 static void free_canon_ace_list( canon_ace *l_head )
771 {
772 canon_ace *list, *next;
773
774 for (list = l_head; list; list = next) {
775 next = list->next;
776 DLIST_REMOVE(l_head, list);
777 TALLOC_FREE(list);
778 }
779 }
780
781 /****************************************************************************
782 Function to duplicate a canon_ace entry.
783 ****************************************************************************/
784
785 static canon_ace *dup_canon_ace( canon_ace *src_ace)
786 {
787 canon_ace *dst_ace = talloc(talloc_tos(), canon_ace);
788
789 if (dst_ace == NULL)
790 return NULL;
791
792 *dst_ace = *src_ace;
793 dst_ace->prev = dst_ace->next = NULL;
794 return dst_ace;
795 }
796
797 /****************************************************************************
798 Print out a canon ace.
799 ****************************************************************************/
800
801 static void print_canon_ace(canon_ace *pace, int num)
802 {
803 struct dom_sid_buf buf;
804 dbgtext( "canon_ace index %d. Type = %s ", num, pace->attr == ALLOW_ACE ? "allow" : "deny" );
805 dbgtext( "SID = %s ", dom_sid_str_buf(&pace->trustee, &buf));
806 if (pace->owner_type == UID_ACE) {
807 dbgtext( "uid %u ", (unsigned int)pace->unix_ug.id);
808 } else if (pace->owner_type == GID_ACE) {
809 dbgtext( "gid %u ", (unsigned int)pace->unix_ug.id);
810 } else
811 dbgtext( "other ");
812 switch (pace->type) {
813 case SMB_ACL_USER:
814 dbgtext( "SMB_ACL_USER ");
815 break;
816 case SMB_ACL_USER_OBJ:
817 dbgtext( "SMB_ACL_USER_OBJ ");
818 break;
819 case SMB_ACL_GROUP:
820 dbgtext( "SMB_ACL_GROUP ");
821 break;
822 case SMB_ACL_GROUP_OBJ:
823 dbgtext( "SMB_ACL_GROUP_OBJ ");
824 break;
825 case SMB_ACL_OTHER:
826 dbgtext( "SMB_ACL_OTHER ");
827 break;
828 default:
829 dbgtext( "MASK " );
830 break;
831 }
832
833 dbgtext( "ace_flags = 0x%x ", (unsigned int)pace->ace_flags);
834 dbgtext( "perms ");
835 dbgtext( "%c", pace->perms & S_IRUSR ? 'r' : '-');
836 dbgtext( "%c", pace->perms & S_IWUSR ? 'w' : '-');
837 dbgtext( "%c\n", pace->perms & S_IXUSR ? 'x' : '-');
838 }
839
840 /****************************************************************************
841 Print out a canon ace list.
842 ****************************************************************************/
843
844 static void print_canon_ace_list(const char *name, canon_ace *ace_list)
845 {
846 int count = 0;
847
848 if( DEBUGLVL( 10 )) {
849 dbgtext( "print_canon_ace_list: %s\n", name );
850 for (;ace_list; ace_list = ace_list->next, count++)
851 print_canon_ace(ace_list, count );
852 }
853 }
854
855 /****************************************************************************
856 Map POSIX ACL perms to canon_ace permissions (a mode_t containing only S_(R|W|X)USR bits).
857 ****************************************************************************/
858
859 static mode_t convert_permset_to_mode_t(SMB_ACL_PERMSET_T permset)
860 {
861 mode_t ret = 0;
862
863 ret |= (sys_acl_get_perm(permset, SMB_ACL_READ) ? S_IRUSR : 0);
864 ret |= (sys_acl_get_perm(permset, SMB_ACL_WRITE) ? S_IWUSR : 0);
865 ret |= (sys_acl_get_perm(permset, SMB_ACL_EXECUTE) ? S_IXUSR : 0);
866
867 return ret;
868 }
869
870 /****************************************************************************
871 Map generic UNIX permissions to canon_ace permissions (a mode_t containing only S_(R|W|X)USR bits).
872 ****************************************************************************/
873
874 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 int map_acl_perms_to_permset(mode_t mode, SMB_ACL_PERMSET_T *p_permset)
894 {
895 if (sys_acl_clear_perms(*p_permset) == -1)
896 return -1;
897 if (mode & S_IRUSR) {
898 if (sys_acl_add_perm(*p_permset, SMB_ACL_READ) == -1)
899 return -1;
900 }
901 if (mode & S_IWUSR) {
902 if (sys_acl_add_perm(*p_permset, SMB_ACL_WRITE) == -1)
903 return -1;
904 }
905 if (mode & S_IXUSR) {
906 if (sys_acl_add_perm(*p_permset, SMB_ACL_EXECUTE) == -1)
907 return -1;
908 }
909 return 0;
910 }
911
912 /****************************************************************************
913 Function to create owner and group SIDs from a SMB_STRUCT_STAT.
914 ****************************************************************************/
915
916 static void create_file_sids(const SMB_STRUCT_STAT *psbuf,
917 struct dom_sid *powner_sid,
918 struct dom_sid *pgroup_sid)
919 {
920 uid_to_sid( powner_sid, psbuf->st_ex_uid );
921 gid_to_sid( pgroup_sid, psbuf->st_ex_gid );
922 }
923
924 /****************************************************************************
925 Merge aces with a common UID or GID - if both are allow or deny, OR the permissions together and
926 delete the second one. If the first is deny, mask the permissions off and delete the allow
927 if the permissions become zero, delete the deny if the permissions are non zero.
928 ****************************************************************************/
929
930 static void merge_aces( canon_ace **pp_list_head, bool dir_acl)
931 {
932 canon_ace *l_head = *pp_list_head;
933 canon_ace *curr_ace_outer;
934 canon_ace *curr_ace_outer_next;
935
936 /*
937 * First, merge allow entries with identical SIDs, and deny entries
938 * with identical SIDs.
939 */
940
941 for (curr_ace_outer = l_head; curr_ace_outer; curr_ace_outer = curr_ace_outer_next) {
942 canon_ace *curr_ace;
943 canon_ace *curr_ace_next;
944
945 curr_ace_outer_next = curr_ace_outer->next; /* Save the link in case we delete. */
946
947 for (curr_ace = curr_ace_outer->next; curr_ace; curr_ace = curr_ace_next) {
948 bool can_merge = false;
949
950 curr_ace_next = curr_ace->next; /* Save the link in case of delete. */
951
952 /* For file ACLs we can merge if the SIDs and ALLOW/DENY
953 * types are the same. For directory acls we must also
954 * ensure the POSIX ACL types are the same.
955 *
956 * For the IDMAP_BOTH case, we must not merge
957 * the UID and GID ACE values for same SID
958 */
959
960 if (!dir_acl) {
961 can_merge = (curr_ace->unix_ug.id == curr_ace_outer->unix_ug.id &&
962 curr_ace->owner_type == curr_ace_outer->owner_type &&
963 (curr_ace->attr == curr_ace_outer->attr));
964 } else {
965 can_merge = (curr_ace->unix_ug.id == curr_ace_outer->unix_ug.id &&
966 curr_ace->owner_type == curr_ace_outer->owner_type &&
967 (curr_ace->type == curr_ace_outer->type) &&
968 (curr_ace->attr == curr_ace_outer->attr));
969 }
970
971 if (can_merge) {
972 if( DEBUGLVL( 10 )) {
973 dbgtext("merge_aces: Merging ACE's\n");
974 print_canon_ace( curr_ace_outer, 0);
975 print_canon_ace( curr_ace, 0);
976 }
977
978 /* Merge two allow or two deny ACE's. */
979
980 /* Theoretically we shouldn't merge a dir ACE if
981 * one ACE has the CI flag set, and the other
982 * ACE has the OI flag set, but this is rare
983 * enough we can ignore it. */
984
985 curr_ace_outer->perms |= curr_ace->perms;
986 curr_ace_outer->ace_flags |= curr_ace->ace_flags;
987 DLIST_REMOVE(l_head, curr_ace);
988 TALLOC_FREE(curr_ace);
989 curr_ace_outer_next = curr_ace_outer->next; /* We may have deleted the link. */
990 }
991 }
992 }
993
994 /*
995 * Now go through and mask off allow permissions with deny permissions.
996 * We can delete either the allow or deny here as we know that each SID
997 * appears only once in the list.
998 */
999
1000 for (curr_ace_outer = l_head; curr_ace_outer; curr_ace_outer = curr_ace_outer_next) {
1001 canon_ace *curr_ace;
1002 canon_ace *curr_ace_next;
1003
1004 curr_ace_outer_next = curr_ace_outer->next; /* Save the link in case we delete. */
1005
1006 for (curr_ace = curr_ace_outer->next; curr_ace; curr_ace = curr_ace_next) {
1007
1008 curr_ace_next = curr_ace->next; /* Save the link in case of delete. */
1009
1010 /*
1011 * Subtract ACE's with different entries. Due to the ordering constraints
1012 * we've put on the ACL, we know the deny must be the first one.
1013 */
1014
1015 if (curr_ace->unix_ug.id == curr_ace_outer->unix_ug.id &&
1016 (curr_ace->owner_type == curr_ace_outer->owner_type) &&
1017 (curr_ace_outer->attr == DENY_ACE) && (curr_ace->attr == ALLOW_ACE)) {
1018
1019 if( DEBUGLVL( 10 )) {
1020 dbgtext("merge_aces: Masking ACE's\n");
1021 print_canon_ace( curr_ace_outer, 0);
1022 print_canon_ace( curr_ace, 0);
1023 }
1024
1025 curr_ace->perms &= ~curr_ace_outer->perms;
1026
1027 if (curr_ace->perms == 0) {
1028
1029 /*
1030 * The deny overrides the allow. Remove the allow.
1031 */
1032
1033 DLIST_REMOVE(l_head, curr_ace);
1034 TALLOC_FREE(curr_ace);
1035 curr_ace_outer_next = curr_ace_outer->next; /* We may have deleted the link. */
1036
1037 } else {
1038
1039 /*
1040 * Even after removing permissions, there
1041 * are still allow permissions - delete the deny.
1042 * It is safe to delete the deny here,
1043 * as we are guarenteed by the deny first
1044 * ordering that all the deny entries for
1045 * this SID have already been merged into one
1046 * before we can get to an allow ace.
1047 */
1048
1049 DLIST_REMOVE(l_head, curr_ace_outer);
1050 TALLOC_FREE(curr_ace_outer);
1051 break;
1052 }
1053 }
1054
1055 } /* end for curr_ace */
1056 } /* end for curr_ace_outer */
1057
1058 /* We may have modified the list. */
1059
1060 *pp_list_head = l_head;
1061 }
1062
1063 /****************************************************************************
1064 Map canon_ace perms to permission bits NT.
1065 The attr element is not used here - we only process deny entries on set,
1066 not get. Deny entries are implicit on get with ace->perms = 0.
1067 ****************************************************************************/
1068
1069 uint32_t map_canon_ace_perms(int snum,
1070 enum security_ace_type *pacl_type,
1071 mode_t perms,
1072 bool directory_ace)
1073 {
1074 uint32_t nt_mask = 0;
1075
1076 *pacl_type = SEC_ACE_TYPE_ACCESS_ALLOWED;
1077
1078 if (lp_acl_map_full_control(snum) && ((perms & ALL_ACE_PERMS) == ALL_ACE_PERMS)) {
1079 if (directory_ace) {
1080 nt_mask = UNIX_DIRECTORY_ACCESS_RWX;
1081 } else {
1082 nt_mask = (UNIX_ACCESS_RWX & ~DELETE_ACCESS);
1083 }
1084 } else if ((perms & ALL_ACE_PERMS) == (mode_t)0) {
1085 /*
1086 * Windows NT refuses to display ACEs with no permissions in them (but
1087 * they are perfectly legal with Windows 2000). If the ACE has empty
1088 * permissions we cannot use 0, so we use the otherwise unused
1089 * WRITE_OWNER permission, which we ignore when we set an ACL.
1090 * We abstract this into a #define of UNIX_ACCESS_NONE to allow this
1091 * to be changed in the future.
1092 */
1093
1094 nt_mask = 0;
1095 } else {
1096 if (directory_ace) {
1097 nt_mask |= ((perms & S_IRUSR) ? UNIX_DIRECTORY_ACCESS_R : 0 );
1098 nt_mask |= ((perms & S_IWUSR) ? UNIX_DIRECTORY_ACCESS_W : 0 );
1099 nt_mask |= ((perms & S_IXUSR) ? UNIX_DIRECTORY_ACCESS_X : 0 );
1100 } else {
1101 nt_mask |= ((perms & S_IRUSR) ? UNIX_ACCESS_R : 0 );
1102 nt_mask |= ((perms & S_IWUSR) ? UNIX_ACCESS_W : 0 );
1103 nt_mask |= ((perms & S_IXUSR) ? UNIX_ACCESS_X : 0 );
1104 }
1105 }
1106
1107 if ((perms & S_IWUSR) && lp_dos_filemode(snum)) {
1108 nt_mask |= (SEC_STD_WRITE_DAC|SEC_STD_WRITE_OWNER|DELETE_ACCESS);
1109 }
1110
1111 DEBUG(10,("map_canon_ace_perms: Mapped (UNIX) %x to (NT) %x\n",
1112 (unsigned int)perms, (unsigned int)nt_mask ));
1113
1114 return nt_mask;
1115 }
1116
1117 /****************************************************************************
1118 Map NT perms to a UNIX mode_t.
1119 ****************************************************************************/
1120
1121 #define FILE_SPECIFIC_READ_BITS (FILE_READ_DATA|FILE_READ_EA)
1122 #define FILE_SPECIFIC_WRITE_BITS (FILE_WRITE_DATA|FILE_APPEND_DATA|FILE_WRITE_EA)
1123 #define FILE_SPECIFIC_EXECUTE_BITS (FILE_EXECUTE)
1124
1125 static mode_t map_nt_perms( uint32_t *mask, int type)
1126 {
1127 mode_t mode = 0;
1128
1129 switch(type) {
1130 case S_IRUSR:
1131 if((*mask) & GENERIC_ALL_ACCESS)
1132 mode = S_IRUSR|S_IWUSR|S_IXUSR;
1133 else {
1134 mode |= ((*mask) & (GENERIC_READ_ACCESS|FILE_SPECIFIC_READ_BITS)) ? S_IRUSR : 0;
1135 mode |= ((*mask) & (GENERIC_WRITE_ACCESS|FILE_SPECIFIC_WRITE_BITS)) ? S_IWUSR : 0;
1136 mode |= ((*mask) & (GENERIC_EXECUTE_ACCESS|FILE_SPECIFIC_EXECUTE_BITS)) ? S_IXUSR : 0;
1137 }
1138 break;
1139 case S_IRGRP:
1140 if((*mask) & GENERIC_ALL_ACCESS)
1141 mode = S_IRGRP|S_IWGRP|S_IXGRP;
1142 else {
1143 mode |= ((*mask) & (GENERIC_READ_ACCESS|FILE_SPECIFIC_READ_BITS)) ? S_IRGRP : 0;
1144 mode |= ((*mask) & (GENERIC_WRITE_ACCESS|FILE_SPECIFIC_WRITE_BITS)) ? S_IWGRP : 0;
1145 mode |= ((*mask) & (GENERIC_EXECUTE_ACCESS|FILE_SPECIFIC_EXECUTE_BITS)) ? S_IXGRP : 0;
1146 }
1147 break;
1148 case S_IROTH:
1149 if((*mask) & GENERIC_ALL_ACCESS)
1150 mode = S_IROTH|S_IWOTH|S_IXOTH;
1151 else {
1152 mode |= ((*mask) & (GENERIC_READ_ACCESS|FILE_SPECIFIC_READ_BITS)) ? S_IROTH : 0;
1153 mode |= ((*mask) & (GENERIC_WRITE_ACCESS|FILE_SPECIFIC_WRITE_BITS)) ? S_IWOTH : 0;
1154 mode |= ((*mask) & (GENERIC_EXECUTE_ACCESS|FILE_SPECIFIC_EXECUTE_BITS)) ? S_IXOTH : 0;
1155 }
1156 break;
1157 }
1158
1159 return mode;
1160 }
1161
1162 /****************************************************************************
1163 Unpack a struct security_descriptor into a UNIX owner and group.
1164 ****************************************************************************/
1165
1166 NTSTATUS unpack_nt_owners(struct connection_struct *conn,
1167 uid_t *puser, gid_t *pgrp,
1168 uint32_t security_info_sent, const struct
1169 security_descriptor *psd)
1170 {
1171 *puser = (uid_t)-1;
1172 *pgrp = (gid_t)-1;
1173
1174 if(security_info_sent == 0) {
1175 DEBUG(0,("unpack_nt_owners: no security info sent !\n"));
1176 return NT_STATUS_OK;
1177 }
1178
1179 /*
1180 * Validate the owner and group SID's.
1181 */
1182
1183 DEBUG(5,("unpack_nt_owners: validating owner_sids.\n"));
1184
1185 /*
1186 * Don't immediately fail if the owner sid cannot be validated.
1187 * This may be a group chown only set.
1188 */
1189
1190 if (security_info_sent & SECINFO_OWNER) {
1191 if (!sid_to_uid(psd->owner_sid, puser)) {
1192 if (lp_force_unknown_acl_user(SNUM(conn))) {
1193 /* this allows take ownership to work
1194 * reasonably */
1195 *puser = get_current_uid(conn);
1196 } else {
1197 struct dom_sid_buf buf;
1198 DBG_NOTICE("unable to validate"
1199 " owner sid for %s\n",
1200 dom_sid_str_buf(psd->owner_sid,
1201 &buf));
1202 return NT_STATUS_INVALID_OWNER;
1203 }
1204 }
1205 DEBUG(3,("unpack_nt_owners: owner sid mapped to uid %u\n",
1206 (unsigned int)*puser ));
1207 }
1208
1209 /*
1210 * Don't immediately fail if the group sid cannot be validated.
1211 * This may be an owner chown only set.
1212 */
1213
1214 if (security_info_sent & SECINFO_GROUP) {
1215 if (!sid_to_gid(psd->group_sid, pgrp)) {
1216 if (lp_force_unknown_acl_user(SNUM(conn))) {
1217 /* this allows take group ownership to work
1218 * reasonably */
1219 *pgrp = get_current_gid(conn);
1220 } else {
1221 DEBUG(3,("unpack_nt_owners: unable to validate"
1222 " group sid.\n"));
1223 return NT_STATUS_INVALID_OWNER;
1224 }
1225 }
1226 DEBUG(3,("unpack_nt_owners: group sid mapped to gid %u\n",
1227 (unsigned int)*pgrp));
1228 }
1229
1230 DEBUG(5,("unpack_nt_owners: owner_sids validated.\n"));
1231
1232 return NT_STATUS_OK;
1233 }
1234
1235
1236 static void trim_ace_perms(canon_ace *pace)
1237 {
1238 pace->perms = pace->perms & (S_IXUSR|S_IWUSR|S_IRUSR);
1239 }
1240
1241 static void ensure_minimal_owner_ace_perms(const bool is_directory,
1242 canon_ace *pace)
1243 {
1244 pace->perms |= S_IRUSR;
1245 if (is_directory) {
1246 pace->perms |= (S_IWUSR|S_IXUSR);
1247 }
1248 }
1249
1250 /****************************************************************************
1251 Check if a given uid/SID is in a group gid/SID. This is probably very
1252 expensive and will need optimisation. A *lot* of optimisation :-). JRA.
1253 ****************************************************************************/
1254
1255 static bool uid_entry_in_group(connection_struct *conn, canon_ace *uid_ace, canon_ace *group_ace )
1256 {
1257 bool is_sid = false;
1258 bool has_sid = false;
1259 struct security_token *security_token = NULL;
1260
1261 /* "Everyone" always matches every uid. */
1262
1263 if (dom_sid_equal(&group_ace->trustee, &global_sid_World))
1264 return True;
1265
1266 /*
1267 * if we have session info in conn, we already have the (SID
1268 * based) NT token and don't need to do the complex
1269 * user_in_group_sid() call
1270 */
1271 if (conn->session_info) {
1272 security_token = conn->session_info->security_token;
1273 /* security_token should not be NULL */
1274 SMB_ASSERT(security_token);
1275 is_sid = security_token_is_sid(security_token,
1276 &uid_ace->trustee);
1277 if (is_sid) {
1278 has_sid = security_token_has_sid(security_token,
1279 &group_ace->trustee);
1280
1281 if (has_sid) {
1282 return true;
1283 }
1284 }
1285
1286 }
1287
1288 /*
1289 * if it's the current user, we already have the unix token
1290 * and don't need to do the complex user_in_group_sid() call
1291 */
1292 if (uid_ace->unix_ug.id == get_current_uid(conn)) {
1293 const struct security_unix_token *curr_utok = NULL;
1294 size_t i;
1295
1296 if (group_ace->unix_ug.id == get_current_gid(conn)) {
1297 return True;
1298 }
1299
1300 curr_utok = get_current_utok(conn);
1301 for (i=0; i < curr_utok->ngroups; i++) {
1302 if (group_ace->unix_ug.id == curr_utok->groups[i]) {
1303 return True;
1304 }
1305 }
1306 }
1307
1308 /*
1309 * user_in_group_sid() uses create_token_from_sid()
1310 * which creates an artificial NT token given just a username,
1311 * so this is not reliable for users from foreign domains
1312 * exported by winbindd!
1313 */
1314 return user_sid_in_group_sid(&uid_ace->trustee, &group_ace->trustee);
1315 }
1316
1317 /****************************************************************************
1318 A well formed POSIX file or default ACL has at least 3 entries, a
1319 SMB_ACL_USER_OBJ, SMB_ACL_GROUP_OBJ, SMB_ACL_OTHER_OBJ.
1320 In addition, the owner must always have at least read access.
1321 When using this call on get_acl, the pst struct is valid and contains
1322 the mode of the file.
1323 ****************************************************************************/
1324
1325 static bool ensure_canon_entry_valid_on_get(connection_struct *conn,
1326 canon_ace **pp_ace,
1327 const struct dom_sid *pfile_owner_sid,
1328 const struct dom_sid *pfile_grp_sid,
1329 const SMB_STRUCT_STAT *pst)
1330 {
1331 canon_ace *pace;
1332 bool got_user = false;
1333 bool got_group = false;
1334 bool got_other = false;
1335
1336 for (pace = *pp_ace; pace; pace = pace->next) {
1337 if (pace->type == SMB_ACL_USER_OBJ) {
1338 got_user = true;
1339 } else if (pace->type == SMB_ACL_GROUP_OBJ) {
1340 got_group = true;
1341 } else if (pace->type == SMB_ACL_OTHER) {
1342 got_other = true;
1343 }
1344 }
1345
1346 if (!got_user) {
1347 if ((pace = talloc(talloc_tos(), canon_ace)) == NULL) {
1348 DEBUG(0,("malloc fail.\n"));
1349 return false;
1350 }
1351
1352 ZERO_STRUCTP(pace);
1353 pace->type = SMB_ACL_USER_OBJ;
1354 pace->owner_type = UID_ACE;
1355 pace->unix_ug.type = ID_TYPE_UID;
1356 pace->unix_ug.id = pst->st_ex_uid;
1357 pace->trustee = *pfile_owner_sid;
1358 pace->attr = ALLOW_ACE;
1359 pace->perms = unix_perms_to_acl_perms(pst->st_ex_mode, S_IRUSR, S_IWUSR, S_IXUSR);
1360 DLIST_ADD(*pp_ace, pace);
1361 }
1362
1363 if (!got_group) {
1364 if ((pace = talloc(talloc_tos(), canon_ace)) == NULL) {
1365 DEBUG(0,("malloc fail.\n"));
1366 return false;
1367 }
1368
1369 ZERO_STRUCTP(pace);
1370 pace->type = SMB_ACL_GROUP_OBJ;
1371 pace->owner_type = GID_ACE;
1372 pace->unix_ug.type = ID_TYPE_GID;
1373 pace->unix_ug.id = pst->st_ex_gid;
1374 pace->trustee = *pfile_grp_sid;
1375 pace->attr = ALLOW_ACE;
1376 pace->perms = unix_perms_to_acl_perms(pst->st_ex_mode, S_IRGRP, S_IWGRP, S_IXGRP);
1377 DLIST_ADD(*pp_ace, pace);
1378 }
1379
1380 if (!got_other) {
1381 if ((pace = talloc(talloc_tos(), canon_ace)) == NULL) {
1382 DEBUG(0,("malloc fail.\n"));
1383 return false;
1384 }
1385
1386 ZERO_STRUCTP(pace);
1387 pace->type = SMB_ACL_OTHER;
1388 pace->owner_type = WORLD_ACE;
1389 pace->unix_ug.type = ID_TYPE_NOT_SPECIFIED;
1390 pace->unix_ug.id = -1;
1391 pace->trustee = global_sid_World;
1392 pace->attr = ALLOW_ACE;
1393 pace->perms = unix_perms_to_acl_perms(pst->st_ex_mode, S_IROTH, S_IWOTH, S_IXOTH);
1394 DLIST_ADD(*pp_ace, pace);
1395 }
1396
1397 return true;
1398 }
1399
1400 /****************************************************************************
1401 A well formed POSIX file or default ACL has at least 3 entries, a
1402 SMB_ACL_USER_OBJ, SMB_ACL_GROUP_OBJ, SMB_ACL_OTHER_OBJ.
1403 In addition, the owner must always have at least read access.
1404 When using this call on set_acl, the pst struct has
1405 been modified to have a mode containing the default for this file or directory
1406 type.
1407 ****************************************************************************/
1408
1409 static bool ensure_canon_entry_valid_on_set(connection_struct *conn,
1410 canon_ace **pp_ace,
1411 bool is_default_acl,
1412 const struct share_params *params,
1413 const bool is_directory,
1414 const struct dom_sid *pfile_owner_sid,
1415 const struct dom_sid *pfile_grp_sid,
1416 const SMB_STRUCT_STAT *pst)
1417 {
1418 canon_ace *pace;
1419 canon_ace *pace_user = NULL;
1420 canon_ace *pace_group = NULL;
1421 canon_ace *pace_other = NULL;
1422 bool got_duplicate_user = false;
1423 bool got_duplicate_group = false;
1424
1425 for (pace = *pp_ace; pace; pace = pace->next) {
1426 trim_ace_perms(pace);
1427 if (pace->type == SMB_ACL_USER_OBJ) {
1428 ensure_minimal_owner_ace_perms(is_directory, pace);
1429 pace_user = pace;
1430 } else if (pace->type == SMB_ACL_GROUP_OBJ) {
1431 pace_group = pace;
1432 } else if (pace->type == SMB_ACL_OTHER) {
1433 pace_other = pace;
1434 }
1435 }
1436
1437 if (!pace_user) {
1438 canon_ace *pace_iter;
1439
1440 if ((pace = talloc(talloc_tos(), canon_ace)) == NULL) {
1441 DEBUG(0,("talloc fail.\n"));
1442 return false;
1443 }
1444
1445 ZERO_STRUCTP(pace);
1446 pace->type = SMB_ACL_USER_OBJ;
1447 pace->owner_type = UID_ACE;
1448 pace->unix_ug.type = ID_TYPE_UID;
1449 pace->unix_ug.id = pst->st_ex_uid;
1450 pace->trustee = *pfile_owner_sid;
1451 pace->attr = ALLOW_ACE;
1452 /* Start with existing user permissions, principle of least
1453 surprises for the user. */
1454 pace->perms = unix_perms_to_acl_perms(pst->st_ex_mode, S_IRUSR, S_IWUSR, S_IXUSR);
1455
1456 /* See if the owning user is in any of the other groups in
1457 the ACE, or if there's a matching user entry (by uid
1458 or in the case of ID_TYPE_BOTH by SID).
1459 If so, OR in the permissions from that entry. */
1460
1461
1462 for (pace_iter = *pp_ace; pace_iter; pace_iter = pace_iter->next) {
1463 if (pace_iter->type == SMB_ACL_USER &&
1464 pace_iter->unix_ug.id == pace->unix_ug.id) {
1465 pace->perms |= pace_iter->perms;
1466 } else if (pace_iter->type == SMB_ACL_GROUP_OBJ || pace_iter->type == SMB_ACL_GROUP) {
1467 if (dom_sid_equal(&pace->trustee, &pace_iter->trustee)) {
1468 pace->perms |= pace_iter->perms;
1469 } else if (uid_entry_in_group(conn, pace, pace_iter)) {
1470 pace->perms |= pace_iter->perms;
1471 }
1472 }
1473 }
1474
1475 if (pace->perms == 0) {
1476 /* If we only got an "everyone" perm, just use that. */
1477 if (pace_other)
1478 pace->perms = pace_other->perms;
1479 }
1480
1481 /*
1482 * Ensure we have default parameters for the
1483 * user (owner) even on default ACLs.
1484 */
1485 ensure_minimal_owner_ace_perms(is_directory, pace);
1486
1487 DLIST_ADD(*pp_ace, pace);
1488 pace_user = pace;
1489 }
1490
1491 if (!pace_group) {
1492 if ((pace = talloc(talloc_tos(), canon_ace)) == NULL) {
1493 DEBUG(0,("talloc fail.\n"));
1494 return false;
1495 }
1496
1497 ZERO_STRUCTP(pace);
1498 pace->type = SMB_ACL_GROUP_OBJ;
1499 pace->owner_type = GID_ACE;
1500 pace->unix_ug.type = ID_TYPE_GID;
1501 pace->unix_ug.id = pst->st_ex_gid;
1502 pace->trustee = *pfile_grp_sid;
1503 pace->attr = ALLOW_ACE;
1504
1505 /* If we only got an "everyone" perm, just use that. */
1506 if (pace_other) {
1507 pace->perms = pace_other->perms;
1508 } else {
1509 pace->perms = 0;
1510 }
1511
1512 DLIST_ADD(*pp_ace, pace);
1513 pace_group = pace;
1514 }
1515
1516 if (!pace_other) {
1517 if ((pace = talloc(talloc_tos(), canon_ace)) == NULL) {
1518 DEBUG(0,("talloc fail.\n"));
1519 return false;
1520 }
1521
1522 ZERO_STRUCTP(pace);
1523 pace->type = SMB_ACL_OTHER;
1524 pace->owner_type = WORLD_ACE;
1525 pace->unix_ug.type = ID_TYPE_NOT_SPECIFIED;
1526 pace->unix_ug.id = -1;
1527 pace->trustee = global_sid_World;
1528 pace->attr = ALLOW_ACE;
1529 pace->perms = 0;
1530
1531 DLIST_ADD(*pp_ace, pace);
1532 pace_other = pace;
1533 }
1534
1535 /* Ensure when setting a POSIX ACL, that the uid for a
1536 SMB_ACL_USER_OBJ ACE (the owner ACE entry) has a duplicate
1537 permission entry as an SMB_ACL_USER, and a gid for a
1538 SMB_ACL_GROUP_OBJ ACE (the primary group ACE entry) also has
1539 a duplicate permission entry as an SMB_ACL_GROUP. If not,
1540 then if the ownership or group ownership of this file or
1541 directory gets changed, the user or group can lose their
1542 access. */
1543
1544 for (pace = *pp_ace; pace; pace = pace->next) {
1545 if (pace->type == SMB_ACL_USER &&
1546 pace->unix_ug.id == pace_user->unix_ug.id) {
1547 /* Already got one. */
1548 got_duplicate_user = true;
1549 } else if (pace->type == SMB_ACL_GROUP &&
1550 pace->unix_ug.id == pace_group->unix_ug.id) {
1551 /* Already got one. */
1552 got_duplicate_group = true;
1553 } else if ((pace->type == SMB_ACL_GROUP)
1554 && (dom_sid_equal(&pace->trustee, &pace_user->trustee))) {
1555 /* If the SID owning the file appears
1556 * in a group entry, then we have
1557 * enough duplication, they will still
1558 * have access */
1559 got_duplicate_user = true;
1560 }
1561 }
1562
1563 /* If the SID is equal for the user and group that we need
1564 to add the duplicate for, add only the group */
1565 if (!got_duplicate_user && !got_duplicate_group
1566 && dom_sid_equal(&pace_group->trustee,
1567 &pace_user->trustee)) {
1568 /* Add a duplicate SMB_ACL_GROUP entry, this
1569 * will cover the owning SID as well, as it
1570 * will always be mapped to both a uid and
1571 * gid. */
1572
1573 if ((pace = talloc(talloc_tos(), canon_ace)) == NULL) {
1574 DEBUG(0,("talloc fail.\n"));
1575 return false;
1576 }
1577
1578 ZERO_STRUCTP(pace);
1579 pace->type = SMB_ACL_GROUP;;
1580 pace->owner_type = GID_ACE;
1581 pace->unix_ug.type = ID_TYPE_GID;
1582 pace->unix_ug.id = pace_group->unix_ug.id;
1583 pace->trustee = pace_group->trustee;
1584 pace->attr = pace_group->attr;
1585 pace->perms = pace_group->perms;
1586
1587 DLIST_ADD(*pp_ace, pace);
1588
1589 /* We're done here, make sure the
1590 statements below are not executed. */
1591 got_duplicate_user = true;
1592 got_duplicate_group = true;
1593 }
1594
1595 if (!got_duplicate_user) {
1596 /* Add a duplicate SMB_ACL_USER entry. */
1597 if ((pace = talloc(talloc_tos(), canon_ace)) == NULL) {
1598 DEBUG(0,("talloc fail.\n"));
1599 return false;
1600 }
1601
1602 ZERO_STRUCTP(pace);
1603 pace->type = SMB_ACL_USER;;
1604 pace->owner_type = UID_ACE;
1605 pace->unix_ug.type = ID_TYPE_UID;
1606 pace->unix_ug.id = pace_user->unix_ug.id;
1607 pace->trustee = pace_user->trustee;
1608 pace->attr = pace_user->attr;
1609 pace->perms = pace_user->perms;
1610
1611 DLIST_ADD(*pp_ace, pace);
1612
1613 got_duplicate_user = true;
1614 }
1615
1616 if (!got_duplicate_group) {
1617 /* Add a duplicate SMB_ACL_GROUP entry. */
1618 if ((pace = talloc(talloc_tos(), canon_ace)) == NULL) {
1619 DEBUG(0,("talloc fail.\n"));
1620 return false;
1621 }
1622
1623 ZERO_STRUCTP(pace);
1624 pace->type = SMB_ACL_GROUP;;
1625 pace->owner_type = GID_ACE;
1626 pace->unix_ug.type = ID_TYPE_GID;
1627 pace->unix_ug.id = pace_group->unix_ug.id;
1628 pace->trustee = pace_group->trustee;
1629 pace->attr = pace_group->attr;
1630 pace->perms = pace_group->perms;
1631
1632 DLIST_ADD(*pp_ace, pace);
1633
1634 got_duplicate_group = true;
1635 }
1636
1637 return true;
1638 }
1639
1640 /****************************************************************************
1641 Check if a POSIX ACL has the required SMB_ACL_USER_OBJ and SMB_ACL_GROUP_OBJ entries.
1642 If it does not have them, check if there are any entries where the trustee is the
1643 file owner or the owning group, and map these to SMB_ACL_USER_OBJ and SMB_ACL_GROUP_OBJ.
1644 Note we must not do this to default directory ACLs.
1645 ****************************************************************************/
1646
1647 static void check_owning_objs(canon_ace *ace, struct dom_sid *pfile_owner_sid, struct dom_sid *pfile_grp_sid)
1648 {
1649 bool got_user_obj, got_group_obj;
1650 canon_ace *current_ace;
1651 int i, entries;
1652
1653 entries = count_canon_ace_list(ace);
1654 got_user_obj = False;
1655 got_group_obj = False;
1656
1657 for (i=0, current_ace = ace; i < entries; i++, current_ace = current_ace->next) {
1658 if (current_ace->type == SMB_ACL_USER_OBJ)
1659 got_user_obj = True;
1660 else if (current_ace->type == SMB_ACL_GROUP_OBJ)
1661 got_group_obj = True;
1662 }
1663 if (got_user_obj && got_group_obj) {
1664 DEBUG(10,("check_owning_objs: ACL had owning user/group entries.\n"));
1665 return;
1666 }
1667
1668 for (i=0, current_ace = ace; i < entries; i++, current_ace = current_ace->next) {
1669 if (!got_user_obj && current_ace->owner_type == UID_ACE &&
1670 dom_sid_equal(&current_ace->trustee, pfile_owner_sid)) {
1671 current_ace->type = SMB_ACL_USER_OBJ;
1672 got_user_obj = True;
1673 }
1674 if (!got_group_obj && current_ace->owner_type == GID_ACE &&
1675 dom_sid_equal(&current_ace->trustee, pfile_grp_sid)) {
1676 current_ace->type = SMB_ACL_GROUP_OBJ;
1677 got_group_obj = True;
1678 }
1679 }
1680 if (!got_user_obj)
1681 DEBUG(10,("check_owning_objs: ACL is missing an owner entry.\n"));
1682 if (!got_group_obj)
1683 DEBUG(10,("check_owning_objs: ACL is missing an owning group entry.\n"));
1684 }
1685
1686 static bool add_current_ace_to_acl(files_struct *fsp, struct security_ace *psa,
1687 canon_ace **file_ace, canon_ace **dir_ace,
1688 bool *got_file_allow, bool *got_dir_allow,
1689 bool *all_aces_are_inherit_only,
1690 canon_ace *current_ace)
1691 {
1692
1693 /*
1694 * Map the given NT permissions into a UNIX mode_t containing only
1695 * S_I(R|W|X)USR bits.
1696 */
1697
1698 current_ace->perms |= map_nt_perms( &psa->access_mask, S_IRUSR);
1699 current_ace->attr = (psa->type == SEC_ACE_TYPE_ACCESS_ALLOWED) ? ALLOW_ACE : DENY_ACE;
1700
1701 /* Store the ace_flag. */
1702 current_ace->ace_flags = psa->flags;
1703
1704 /*
1705 * Now add the created ace to either the file list, the directory
1706 * list, or both. We *MUST* preserve the order here (hence we use
1707 * DLIST_ADD_END) as NT ACLs are order dependent.
1708 */
1709
1710 if (fsp->is_directory) {
1711
1712 /*
1713 * We can only add to the default POSIX ACE list if the ACE is
1714 * designed to be inherited by both files and directories.
1715 */
1716
1717 if ((psa->flags & (SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT)) ==
1718 (SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT)) {
1719
1720 canon_ace *current_dir_ace = current_ace;
1721 DLIST_ADD_END(*dir_ace, current_ace);
1722
1723 /*
1724 * Note if this was an allow ace. We can't process
1725 * any further deny ace's after this.
1726 */
1727
1728 if (current_ace->attr == ALLOW_ACE)
1729 *got_dir_allow = True;
1730
1731 if ((current_ace->attr == DENY_ACE) && *got_dir_allow) {
1732 DEBUG(0,("add_current_ace_to_acl: "
1733 "malformed ACL in "
1734 "inheritable ACL! Deny entry "
1735 "after Allow entry. Failing "
1736 "to set on file %s.\n",
1737 fsp_str_dbg(fsp)));
1738 return False;
1739 }
1740
1741 if( DEBUGLVL( 10 )) {
1742 dbgtext("add_current_ace_to_acl: adding dir ACL:\n");
1743 print_canon_ace( current_ace, 0);
1744 }
1745
1746 /*
1747 * If this is not an inherit only ACE we need to add a duplicate
1748 * to the file acl.
1749 */
1750
1751 if (!(psa->flags & SEC_ACE_FLAG_INHERIT_ONLY)) {
1752 canon_ace *dup_ace = dup_canon_ace(current_ace);
1753
1754 if (!dup_ace) {
1755 DEBUG(0,("add_current_ace_to_acl: malloc fail !\n"));
1756 return False;
1757 }
1758
1759 /*
1760 * We must not free current_ace here as its
1761 * pointer is now owned by the dir_ace list.
1762 */
1763 current_ace = dup_ace;
1764 /* We've essentially split this ace into two,
1765 * and added the ace with inheritance request
1766 * bits to the directory ACL. Drop those bits for
1767 * the ACE we're adding to the file list. */
1768 current_ace->ace_flags &= ~(SEC_ACE_FLAG_OBJECT_INHERIT|
1769 SEC_ACE_FLAG_CONTAINER_INHERIT|
1770 SEC_ACE_FLAG_INHERIT_ONLY);
1771 } else {
1772 /*
1773 * We must not free current_ace here as its
1774 * pointer is now owned by the dir_ace list.
1775 */
1776 current_ace = NULL;
1777 }
1778
1779 /*
1780 * current_ace is now either owned by file_ace
1781 * or is NULL. We can safely operate on current_dir_ace
1782 * to treat mapping for default acl entries differently
1783 * than access acl entries.
1784 */
1785
1786 if (current_dir_ace->owner_type == UID_ACE) {
1787 /*
1788 * We already decided above this is a uid,
1789 * for default acls ace's only CREATOR_OWNER
1790 * maps to ACL_USER_OBJ. All other uid
1791 * ace's are ACL_USER.
1792 */
1793 if (dom_sid_equal(&current_dir_ace->trustee,
1794 &global_sid_Creator_Owner)) {
1795 current_dir_ace->type = SMB_ACL_USER_OBJ;
1796 } else {
1797 current_dir_ace->type = SMB_ACL_USER;
1798 }
1799 }
1800
1801 if (current_dir_ace->owner_type == GID_ACE) {
1802 /*
1803 * We already decided above this is a gid,
1804 * for default acls ace's only CREATOR_GROUP
1805 * maps to ACL_GROUP_OBJ. All other uid
1806 * ace's are ACL_GROUP.
1807 */
1808 if (dom_sid_equal(&current_dir_ace->trustee,
1809 &global_sid_Creator_Group)) {
1810 current_dir_ace->type = SMB_ACL_GROUP_OBJ;
1811 } else {
1812 current_dir_ace->type = SMB_ACL_GROUP;
1813 }
1814 }
1815 }
1816 }
1817
1818 /*
1819 * Only add to the file ACL if not inherit only.
1820 */
1821
1822 if (current_ace && !(psa->flags & SEC_ACE_FLAG_INHERIT_ONLY)) {
1823 DLIST_ADD_END(*file_ace, current_ace);
1824
1825 /*
1826 * Note if this was an allow ace. We can't process
1827 * any further deny ace's after this.
1828 */
1829
1830 if (current_ace->attr == ALLOW_ACE)
1831 *got_file_allow = True;
1832
1833 if ((current_ace->attr == DENY_ACE) && *got_file_allow) {
1834 DEBUG(0,("add_current_ace_to_acl: malformed "
1835 "ACL in file ACL ! Deny entry after "
1836 "Allow entry. Failing to set on file "
1837 "%s.\n", fsp_str_dbg(fsp)));
1838 return False;
1839 }
1840
1841 if( DEBUGLVL( 10 )) {
1842 dbgtext("add_current_ace_to_acl: adding file ACL:\n");
1843 print_canon_ace( current_ace, 0);
1844 }
1845 *all_aces_are_inherit_only = False;
1846 /*
1847 * We must not free current_ace here as its
1848 * pointer is now owned by the file_ace list.
1849 */
1850 current_ace = NULL;
1851 }
1852
1853 /*
1854 * Free if ACE was not added.
1855 */
1856
1857 TALLOC_FREE(current_ace);
1858 return true;
1859 }
1860
1861 /****************************************************************************
1862 Unpack a struct security_descriptor into two canonical ace lists.
1863 ****************************************************************************/
1864
1865 static bool create_canon_ace_lists(files_struct *fsp,
1866 const SMB_STRUCT_STAT *pst,
1867 struct dom_sid *pfile_owner_sid,
1868 struct dom_sid *pfile_grp_sid,
1869 canon_ace **ppfile_ace,
1870 canon_ace **ppdir_ace,
1871 const struct security_acl *dacl)
1872 {
1873 bool all_aces_are_inherit_only = (fsp->is_directory ? True : False);
1874 canon_ace *file_ace = NULL;
1875 canon_ace *dir_ace = NULL;
1876 canon_ace *current_ace = NULL;
1877 bool got_dir_allow = False;
1878 bool got_file_allow = False;
1879 uint32_t i, j;
1880
1881 *ppfile_ace = NULL;
1882 *ppdir_ace = NULL;
1883
1884 /*
1885 * Convert the incoming ACL into a more regular form.
1886 */
1887
1888 for(i = 0; i < dacl->num_aces; i++) {
1889 struct security_ace *psa = &dacl->aces[i];
1890
1891 if((psa->type != SEC_ACE_TYPE_ACCESS_ALLOWED) && (psa->type != SEC_ACE_TYPE_ACCESS_DENIED)) {
1892 DEBUG(3,("create_canon_ace_lists: unable to set anything but an ALLOW or DENY ACE.\n"));
1893 return False;
1894 }
1895 }
1896
1897 /*
1898 * Deal with the fact that NT 4.x re-writes the canonical format
1899 * that we return for default ACLs. If a directory ACE is identical
1900 * to a inherited directory ACE then NT changes the bits so that the
1901 * first ACE is set to OI|IO and the second ACE for this SID is set
1902 * to CI. We need to repair this. JRA.
1903 */
1904
1905 for(i = 0; i < dacl->num_aces; i++) {
1906 struct security_ace *psa1 = &dacl->aces[i];
1907
1908 for (j = i + 1; j < dacl->num_aces; j++) {
1909 struct security_ace *psa2 = &dacl->aces[j];
1910
1911 if (psa1->access_mask != psa2->access_mask)
1912 continue;
1913
1914 if (!dom_sid_equal(&psa1->trustee, &psa2->trustee))
1915 continue;
1916
1917 /*
1918 * Ok - permission bits and SIDs are equal.
1919 * Check if flags were re-written.
1920 */
1921
1922 if (psa1->flags & SEC_ACE_FLAG_INHERIT_ONLY) {
1923
1924 psa1->flags |= (psa2->flags & (SEC_ACE_FLAG_CONTAINER_INHERIT|SEC_ACE_FLAG_OBJECT_INHERIT));
1925 psa2->flags &= ~(SEC_ACE_FLAG_CONTAINER_INHERIT|SEC_ACE_FLAG_OBJECT_INHERIT);
1926
1927 } else if (psa2->flags & SEC_ACE_FLAG_INHERIT_ONLY) {
1928
1929 psa2->flags |= (psa1->flags & (SEC_ACE_FLAG_CONTAINER_INHERIT|SEC_ACE_FLAG_OBJECT_INHERIT));
1930 psa1->flags &= ~(SEC_ACE_FLAG_CONTAINER_INHERIT|SEC_ACE_FLAG_OBJECT_INHERIT);
1931
1932 }
1933 }
1934 }
1935
1936 for(i = 0; i < dacl->num_aces; i++) {
1937 struct security_ace *psa = &dacl->aces[i];
1938
1939 /*
1940 * Create a canon_ace entry representing this NT DACL ACE.
1941 */
1942
1943 if ((current_ace = talloc(talloc_tos(), canon_ace)) == NULL) {
1944 free_canon_ace_list(file_ace);
1945 free_canon_ace_list(dir_ace);
1946 DEBUG(0,("create_canon_ace_lists: malloc fail.\n"));
1947 return False;
1948 }
1949
1950 ZERO_STRUCTP(current_ace);
1951
1952 sid_copy(&current_ace->trustee, &psa->trustee);
1953
1954 /*
1955 * Try and work out if the SID is a user or group
1956 * as we need to flag these differently for POSIX.
1957 * Note what kind of a POSIX ACL this should map to.
1958 */
1959
1960 if( dom_sid_equal(&current_ace->trustee, &global_sid_World)) {
1961 current_ace->owner_type = WORLD_ACE;
1962 current_ace->unix_ug.type = ID_TYPE_NOT_SPECIFIED;
1963 current_ace->unix_ug.id = -1;
1964 current_ace->type = SMB_ACL_OTHER;
1965 } else if (dom_sid_equal(&current_ace->trustee, &global_sid_Creator_Owner)) {
1966 current_ace->owner_type = UID_ACE;
1967 current_ace->unix_ug.type = ID_TYPE_UID;
1968 current_ace->unix_ug.id = pst->st_ex_uid;
1969 current_ace->type = SMB_ACL_USER_OBJ;
1970
1971 /*
1972 * The Creator Owner entry only specifies inheritable permissions,
1973 * never access permissions. WinNT doesn't always set the ACE to
1974 * INHERIT_ONLY, though.
1975 */
1976
1977 psa->flags |= SEC_ACE_FLAG_INHERIT_ONLY;
1978
1979 } else if (dom_sid_equal(&current_ace->trustee, &global_sid_Creator_Group)) {
1980 current_ace->owner_type = GID_ACE;
1981 current_ace->unix_ug.type = ID_TYPE_GID;
1982 current_ace->unix_ug.id = pst->st_ex_gid;
1983 current_ace->type = SMB_ACL_GROUP_OBJ;
1984
1985 /*
1986 * The Creator Group entry only specifies inheritable permissions,
1987 * never access permissions. WinNT doesn't always set the ACE to
1988 * INHERIT_ONLY, though.
1989 */
1990 psa->flags |= SEC_ACE_FLAG_INHERIT_ONLY;
1991
1992 } else {
1993 struct unixid unixid;
1994
1995 if (!sids_to_unixids(&current_ace->trustee, 1, &unixid)) {
1996 struct dom_sid_buf buf;
1997 free_canon_ace_list(file_ace);
1998 free_canon_ace_list(dir_ace);
1999 TALLOC_FREE(current_ace);
2000 DBG_ERR("sids_to_unixids failed for %s "
2001 "(allocation failure)\n",
2002 dom_sid_str_buf(&current_ace->trustee,
2003 &buf));
2004 return false;
2005 }
2006
2007 if (unixid.type == ID_TYPE_BOTH) {
2008 /*
2009 * We must add both a user and group
2010 * entry POSIX_ACL.
2011 * This is due to the fact that in POSIX
2012 * user entries are more specific than
2013 * groups.
2014 */
2015 current_ace->owner_type = UID_ACE;
2016 current_ace->unix_ug.type = ID_TYPE_UID;
2017 current_ace->unix_ug.id = unixid.id;
2018 current_ace->type =
2019 (unixid.id == pst->st_ex_uid) ?
2020 SMB_ACL_USER_OBJ :
2021 SMB_ACL_USER;
2022
2023 /* Add the user object to the posix ACL,
2024 and proceed to the group mapping
2025 below. This handles the talloc_free
2026 of current_ace if not added for some
2027 reason */
2028 if (!add_current_ace_to_acl(fsp,
2029 psa,
2030 &file_ace,
2031 &dir_ace,
2032 &got_file_allow,
2033 &got_dir_allow,
2034 &all_aces_are_inherit_only,
2035 current_ace)) {
2036 free_canon_ace_list(file_ace);
2037 free_canon_ace_list(dir_ace);
2038 return false;
2039 }
2040
2041 if ((current_ace = talloc(talloc_tos(),
2042 canon_ace)) == NULL) {
2043 free_canon_ace_list(file_ace);
2044 free_canon_ace_list(dir_ace);
2045 DEBUG(0,("create_canon_ace_lists: "
2046 "malloc fail.\n"));
2047 return False;
2048 }
2049
2050 ZERO_STRUCTP(current_ace);
2051
2052 sid_copy(&current_ace->trustee, &psa->trustee);
2053
2054 current_ace->unix_ug.type = ID_TYPE_GID;
2055 current_ace->unix_ug.id = unixid.id;
2056 current_ace->owner_type = GID_ACE;
2057 /* If it's the primary group, this is a
2058 group_obj, not a group. */
2059 if (current_ace->unix_ug.id == pst->st_ex_gid) {
2060 current_ace->type = SMB_ACL_GROUP_OBJ;
2061 } else {
2062 current_ace->type = SMB_ACL_GROUP;
2063 }
2064
2065 } else if (unixid.type == ID_TYPE_UID) {
2066 current_ace->owner_type = UID_ACE;
2067 current_ace->unix_ug.type = ID_TYPE_UID;
2068 current_ace->unix_ug.id = unixid.id;
2069 /* If it's the owning user, this is a user_obj,
2070 not a user. */
2071 if (current_ace->unix_ug.id == pst->st_ex_uid) {
2072 current_ace->type = SMB_ACL_USER_OBJ;
2073 } else {
2074 current_ace->type = SMB_ACL_USER;
2075 }
2076 } else if (unixid.type == ID_TYPE_GID) {
2077 current_ace->unix_ug.type = ID_TYPE_GID;
2078 current_ace->unix_ug.id = unixid.id;
2079 current_ace->owner_type = GID_ACE;
2080 /* If it's the primary group, this is a
2081 group_obj, not a group. */
2082 if (current_ace->unix_ug.id == pst->st_ex_gid) {
2083 current_ace->type = SMB_ACL_GROUP_OBJ;
2084 } else {
2085 current_ace->type = SMB_ACL_GROUP;
2086 }
2087 } else {
2088 struct dom_sid_buf buf;
2089 /*
2090 * Silently ignore map failures in non-mappable SIDs (NT Authority, BUILTIN etc).
2091 */
2092
2093 if (non_mappable_sid(&psa->trustee)) {
2094 DBG_DEBUG("ignoring "
2095 "non-mappable SID %s\n",
2096 dom_sid_str_buf(
2097 &psa->trustee,
2098 &buf));
2099 TALLOC_FREE(current_ace);
2100 continue;
2101 }
2102
2103 if (lp_force_unknown_acl_user(SNUM(fsp->conn))) {
2104 DBG_DEBUG("ignoring unknown or "
2105 "foreign SID %s\n",
2106 dom_sid_str_buf(
2107 &psa->trustee,
2108 &buf));
2109 TALLOC_FREE(current_ace);
2110 continue;
2111 }
2112
2113 free_canon_ace_list(file_ace);
2114 free_canon_ace_list(dir_ace);
2115 DBG_ERR("unable to map SID %s to uid or "
2116 "gid.\n",
2117 dom_sid_str_buf(&current_ace->trustee,
2118 &buf));
2119 TALLOC_FREE(current_ace);
2120 return false;
2121 }
2122 }
2123
2124 /* handles the talloc_free of current_ace if not added for some reason */
2125 if (!add_current_ace_to_acl(fsp, psa, &file_ace, &dir_ace,
2126 &got_file_allow, &got_dir_allow,
2127 &all_aces_are_inherit_only, current_ace)) {
2128 free_canon_ace_list(file_ace);
2129 free_canon_ace_list(dir_ace);
2130 return false;
2131 }
2132 }
2133
2134 if (fsp->is_directory && all_aces_are_inherit_only) {
2135 /*
2136 * Windows 2000 is doing one of these weird 'inherit acl'
2137 * traverses to conserve NTFS ACL resources. Just pretend
2138 * there was no DACL sent. JRA.
2139 */
2140
2141 DEBUG(10,("create_canon_ace_lists: Win2k inherit acl traverse. Ignoring DACL.\n"));
2142 free_canon_ace_list(file_ace);
2143 free_canon_ace_list(dir_ace);
2144 file_ace = NULL;
2145 dir_ace = NULL;
2146 } else {
2147 /*
2148 * Check if we have SMB_ACL_USER_OBJ and SMB_ACL_GROUP_OBJ entries in
2149 * the file ACL. If we don't have them, check if any SMB_ACL_USER/SMB_ACL_GROUP
2150 * entries can be converted to *_OBJ. Don't do this for the default
2151 * ACL, we will create them separately for this if needed inside
2152 * ensure_canon_entry_valid_on_set().
2153 */
2154 if (file_ace) {
2155 check_owning_objs(file_ace, pfile_owner_sid, pfile_grp_sid);
2156 }
2157 }
2158
2159 *ppfile_ace = file_ace;
2160 *ppdir_ace = dir_ace;
2161
2162 return True;
2163 }
2164
2165 /****************************************************************************
2166 ASCII art time again... JRA :-).
2167
2168 We have 4 cases to process when moving from an NT ACL to a POSIX ACL. Firstly,
2169 we insist the ACL is in canonical form (ie. all DENY entries preceede ALLOW
2170 entries). Secondly, the merge code has ensured that all duplicate SID entries for
2171 allow or deny have been merged, so the same SID can only appear once in the deny
2172 list or once in the allow list.
2173
2174 We then process as follows :
2175
2176 ---------------------------------------------------------------------------
2177 First pass - look for a Everyone DENY entry.
2178
2179 If it is deny all (rwx) trunate the list at this point.
2180 Else, walk the list from this point and use the deny permissions of this
2181 entry as a mask on all following allow entries. Finally, delete
2182 the Everyone DENY entry (we have applied it to everything possible).
2183
2184 In addition, in this pass we remove any DENY entries that have
2185 no permissions (ie. they are a DENY nothing).
2186 ---------------------------------------------------------------------------
2187 Second pass - only deal with deny user entries.
2188
2189 DENY user1 (perms XXX)
2190
2191 new_perms = 0
2192 for all following allow group entries where user1 is in group
2193 new_perms |= group_perms;
2194
2195 user1 entry perms = new_perms & ~ XXX;
2196
2197 Convert the deny entry to an allow entry with the new perms and
2198 push to the end of the list. Note if the user was in no groups
2199 this maps to a specific allow nothing entry for this user.
2200
2201 The common case from the NT ACL choser (userX deny all) is
2202 optimised so we don't do the group lookup - we just map to
2203 an allow nothing entry.
2204
2205 What we're doing here is inferring the allow permissions the
2206 person setting the ACE on user1 wanted by looking at the allow
2207 permissions on the groups the user is currently in. This will
2208 be a snapshot, depending on group membership but is the best
2209 we can do and has the advantage of failing closed rather than
2210 open.
2211 ---------------------------------------------------------------------------
2212 Third pass - only deal with deny group entries.
2213
2214 DENY group1 (perms XXX)
2215
2216 for all following allow user entries where user is in group1
2217 user entry perms = user entry perms & ~ XXX;
2218
2219 If there is a group Everyone allow entry with permissions YYY,
2220 convert the group1 entry to an allow entry and modify its
2221 permissions to be :
2222
2223 new_perms = YYY & ~ XXX
2224
2225 and push to the end of the list.
2226
2227 If there is no group Everyone allow entry then convert the
2228 group1 entry to a allow nothing entry and push to the end of the list.
2229
2230 Note that the common case from the NT ACL choser (groupX deny all)
2231 cannot be optimised here as we need to modify user entries who are
2232 in the group to change them to a deny all also.
2233
2234 What we're doing here is modifying the allow permissions of
2235 user entries (which are more specific in POSIX ACLs) to mask
2236 out the explicit deny set on the group they are in. This will
2237 be a snapshot depending on current group membership but is the
2238 best we can do and has the advantage of failing closed rather
2239 than open.
2240 ---------------------------------------------------------------------------
2241 Fourth pass - cope with cumulative permissions.
2242
2243 for all allow user entries, if there exists an allow group entry with
2244 more permissive permissions, and the user is in that group, rewrite the
2245 allow user permissions to contain both sets of permissions.
2246
2247 Currently the code for this is #ifdef'ed out as these semantics make
2248 no sense to me. JRA.
2249 ---------------------------------------------------------------------------
2250
2251 Note we *MUST* do the deny user pass first as this will convert deny user
2252 entries into allow user entries which can then be processed by the deny
2253 group pass.
2254
2255 The above algorithm took a *lot* of thinking about - hence this
2256 explaination :-). JRA.
2257 ****************************************************************************/
2258
2259 /****************************************************************************
2260 Process a canon_ace list entries. This is very complex code. We need
2261 to go through and remove the "deny" permissions from any allow entry that matches
2262 the id of this entry. We have already refused any NT ACL that wasn't in correct
2263 order (DENY followed by ALLOW). If any allow entry ends up with zero permissions,
2264 we just remove it (to fail safe). We have already removed any duplicate ace
2265 entries. Treat an "Everyone" DENY_ACE as a special case - use it to mask all
2266 allow entries.
2267 ****************************************************************************/
2268
2269 static void process_deny_list(connection_struct *conn, canon_ace **pp_ace_list )
2270 {
2271 canon_ace *ace_list = *pp_ace_list;
2272 canon_ace *curr_ace = NULL;
2273 canon_ace *curr_ace_next = NULL;
2274
2275 /* Pass 1 above - look for an Everyone, deny entry. */
2276
2277 for (curr_ace = ace_list; curr_ace; curr_ace = curr_ace_next) {
2278 canon_ace *allow_ace_p;
2279
2280 curr_ace_next = curr_ace->next; /* So we can't lose the link. */
2281
2282 if (curr_ace->attr != DENY_ACE)
2283 continue;
2284
2285 if (curr_ace->perms == (mode_t)0) {
2286
2287 /* Deny nothing entry - delete. */
2288
2289 DLIST_REMOVE(ace_list, curr_ace);
2290 continue;
2291 }
2292
2293 if (!dom_sid_equal(&curr_ace->trustee, &global_sid_World))
2294 continue;
2295
2296 /* JRATEST - assert. */
2297 SMB_ASSERT(curr_ace->owner_type == WORLD_ACE);
2298
2299 if (curr_ace->perms == ALL_ACE_PERMS) {
2300
2301 /*
2302 * Optimisation. This is a DENY_ALL to Everyone. Truncate the
2303 * list at this point including this entry.
2304 */
2305
2306 canon_ace *prev_entry = DLIST_PREV(curr_ace);
2307
2308 free_canon_ace_list( curr_ace );
2309 if (prev_entry)
2310 DLIST_REMOVE(ace_list, prev_entry);
2311 else {
2312 /* We deleted the entire list. */
2313 ace_list = NULL;
2314 }
2315 break;
2316 }
2317
2318 for (allow_ace_p = curr_ace->next; allow_ace_p; allow_ace_p = allow_ace_p->next) {
2319
2320 /*
2321 * Only mask off allow entries.
2322 */
2323
2324 if (allow_ace_p->attr != ALLOW_ACE)
2325 continue;
2326
2327 allow_ace_p->perms &= ~curr_ace->perms;
2328 }
2329
2330 /*
2331 * Now it's been applied, remove it.
2332 */
2333
2334 DLIST_REMOVE(ace_list, curr_ace);
2335 }
2336
2337 /* Pass 2 above - deal with deny user entries. */
2338
2339 for (curr_ace = ace_list; curr_ace; curr_ace = curr_ace_next) {
2340 mode_t new_perms = (mode_t)0;
2341 canon_ace *allow_ace_p;
2342
2343 curr_ace_next = curr_ace->next; /* So we can't lose the link. */
2344
2345 if (curr_ace->attr != DENY_ACE)
2346 continue;
2347
2348 if (curr_ace->owner_type != UID_ACE)
2349 continue;
2350
2351 if (curr_ace->perms == ALL_ACE_PERMS) {
2352
2353 /*
2354 * Optimisation - this is a deny everything to this user.
2355 * Convert to an allow nothing and push to the end of the list.
2356 */
2357
2358 curr_ace->attr = ALLOW_ACE;
2359 curr_ace->perms = (mode_t)0;
2360 DLIST_DEMOTE(ace_list, curr_ace);
2361 continue;
2362 }
2363
2364 for (allow_ace_p = curr_ace->next; allow_ace_p; allow_ace_p = allow_ace_p->next) {
2365
2366 if (allow_ace_p->attr != ALLOW_ACE)
2367 continue;
2368
2369 /* We process GID_ACE and WORLD_ACE entries only. */
2370
2371 if (allow_ace_p->owner_type == UID_ACE)
2372 continue;
2373
2374 if (uid_entry_in_group(conn, curr_ace, allow_ace_p))
2375 new_perms |= allow_ace_p->perms;
2376 }
2377
2378 /*
2379 * Convert to a allow entry, modify the perms and push to the end
2380 * of the list.
2381 */
2382
2383 curr_ace->attr = ALLOW_ACE;
2384 curr_ace->perms = (new_perms & ~curr_ace->perms);
2385 DLIST_DEMOTE(ace_list, curr_ace);
2386 }
2387
2388 /* Pass 3 above - deal with deny group entries. */
2389
2390 for (curr_ace = ace_list; curr_ace; curr_ace = curr_ace_next) {
2391 canon_ace *allow_ace_p;
2392 canon_ace *allow_everyone_p = NULL;
2393
2394 curr_ace_next = curr_ace->next; /* So we can't lose the link. */
2395
2396 if (curr_ace->attr != DENY_ACE)
2397 continue;
2398
2399 if (curr_ace->owner_type != GID_ACE)
2400 continue;
2401
2402 for (allow_ace_p = curr_ace->next; allow_ace_p; allow_ace_p = allow_ace_p->next) {
2403
2404 if (allow_ace_p->attr != ALLOW_ACE)
2405 continue;
2406
2407 /* Store a pointer to the Everyone allow, if it exists. */
2408 if (allow_ace_p->owner_type == WORLD_ACE)
2409 allow_everyone_p = allow_ace_p;
2410
2411 /* We process UID_ACE entries only. */
2412
2413 if (allow_ace_p->owner_type != UID_ACE)
2414 continue;
2415
2416 /* Mask off the deny group perms. */
2417
2418 if (uid_entry_in_group(conn, allow_ace_p, curr_ace))
2419 allow_ace_p->perms &= ~curr_ace->perms;
2420 }
2421
2422 /*
2423 * Convert the deny to an allow with the correct perms and
2424 * push to the end of the list.
2425 */
2426
2427 curr_ace->attr = ALLOW_ACE;
2428 if (allow_everyone_p)
2429 curr_ace->perms = allow_everyone_p->perms & ~curr_ace->perms;
2430 else
2431 curr_ace->perms = (mode_t)0;
2432 DLIST_DEMOTE(ace_list, curr_ace);
2433 }
2434
2435 /* Doing this fourth pass allows Windows semantics to be layered
2436 * on top of POSIX semantics. I'm not sure if this is desirable.
2437 * For example, in W2K ACLs there is no way to say, "Group X no
2438 * access, user Y full access" if user Y is a member of group X.
2439 * This seems completely broken semantics to me.... JRA.
2440 */
2441
2442 #if 0
2443 /* Pass 4 above - deal with allow entries. */
2444
2445 for (curr_ace = ace_list; curr_ace; curr_ace = curr_ace_next) {
2446 canon_ace *allow_ace_p;
2447
2448 curr_ace_next = curr_ace->next; /* So we can't lose the link. */
2449
2450 if (curr_ace->attr != ALLOW_ACE)
2451 continue;
2452
2453 if (curr_ace->owner_type != UID_ACE)
2454 continue;
2455
2456 for (allow_ace_p = ace_list; allow_ace_p; allow_ace_p = allow_ace_p->next) {
2457
2458 if (allow_ace_p->attr != ALLOW_ACE)
2459 continue;
2460
2461 /* We process GID_ACE entries only. */
2462
2463 if (allow_ace_p->owner_type != GID_ACE)
2464 continue;
2465
2466 /* OR in the group perms. */
2467
2468 if (uid_entry_in_group(conn, curr_ace, allow_ace_p))
2469 curr_ace->perms |= allow_ace_p->perms;
2470 }
2471 }
2472 #endif
2473
2474 *pp_ace_list = ace_list;
2475 }
2476
2477 /****************************************************************************
2478 Unpack a struct security_descriptor into two canonical ace lists. We don't depend on this
2479 succeeding.
2480 ****************************************************************************/
2481
2482 static bool unpack_canon_ace(files_struct *fsp,
2483 const SMB_STRUCT_STAT *pst,
2484 struct dom_sid *pfile_owner_sid,
2485 struct dom_sid *pfile_grp_sid,
2486 canon_ace **ppfile_ace,
2487 canon_ace **ppdir_ace,
2488 uint32_t security_info_sent,
2489 const struct security_descriptor *psd)
2490 {
2491 canon_ace *file_ace = NULL;
2492 canon_ace *dir_ace = NULL;
2493
2494 *ppfile_ace = NULL;
2495 *ppdir_ace = NULL;
2496
2497 if(security_info_sent == 0) {
2498 DEBUG(0,("unpack_canon_ace: no security info sent !\n"));
2499 return False;
2500 }
2501
2502 /*
2503 * If no DACL then this is a chown only security descriptor.
2504 */
2505
2506 if(!(security_info_sent & SECINFO_DACL) || !psd->dacl)
2507 return True;
2508
2509 /*
2510 * Now go through the DACL and create the canon_ace lists.
2511 */
2512
2513 if (!create_canon_ace_lists(fsp, pst, pfile_owner_sid, pfile_grp_sid,
2514 &file_ace, &dir_ace, psd->dacl)) {
2515 return False;
2516 }
2517
2518 if ((file_ace == NULL) && (dir_ace == NULL)) {
2519 /* W2K traverse DACL set - ignore. */
2520 return True;
2521 }
2522
2523 /*
2524 * Go through the canon_ace list and merge entries
2525 * belonging to identical users of identical allow or deny type.
2526 * We can do this as all deny entries come first, followed by
2527 * all allow entries (we have mandated this before accepting this acl).
2528 */
2529
2530 print_canon_ace_list( "file ace - before merge", file_ace);
2531 merge_aces( &file_ace, false);
2532
2533 print_canon_ace_list( "dir ace - before merge", dir_ace);
2534 merge_aces( &dir_ace, true);
2535
2536 /*
2537 * NT ACLs are order dependent. Go through the acl lists and
2538 * process DENY entries by masking the allow entries.
2539 */
2540
2541 print_canon_ace_list( "file ace - before deny", file_ace);
2542 process_deny_list(fsp->conn, &file_ace);
2543
2544 print_canon_ace_list( "dir ace - before deny", dir_ace);
2545 process_deny_list(fsp->conn, &dir_ace);
2546
2547 /*
2548 * A well formed POSIX file or default ACL has at least 3 entries, a
2549 * SMB_ACL_USER_OBJ, SMB_ACL_GROUP_OBJ, SMB_ACL_OTHER_OBJ
2550 * and optionally a mask entry. Ensure this is the case.
2551 */
2552
2553 print_canon_ace_list( "file ace - before valid", file_ace);
2554
2555 if (!ensure_canon_entry_valid_on_set(fsp->conn, &file_ace, false, fsp->conn->params,
2556 fsp->is_directory, pfile_owner_sid, pfile_grp_sid, pst)) {
2557 free_canon_ace_list(file_ace);
2558 free_canon_ace_list(dir_ace);
2559 return False;
2560 }
2561
2562 print_canon_ace_list( "dir ace - before valid", dir_ace);
2563
2564 if (dir_ace && !ensure_canon_entry_valid_on_set(fsp->conn, &dir_ace, true, fsp->conn->params,
2565 fsp->is_directory, pfile_owner_sid, pfile_grp_sid, pst)) {
2566 free_canon_ace_list(file_ace);
2567 free_canon_ace_list(dir_ace);
2568 return False;
2569 }
2570
2571 print_canon_ace_list( "file ace - return", file_ace);
2572 print_canon_ace_list( "dir ace - return", dir_ace);
2573
2574 *ppfile_ace = file_ace;
2575 *ppdir_ace = dir_ace;
2576 return True;
2577
2578 }
2579
2580 /******************************************************************************
2581 When returning permissions, try and fit NT display
2582 semantics if possible. Note the the canon_entries here must have been malloced.
2583 The list format should be - first entry = owner, followed by group and other user
2584 entries, last entry = other.
2585
2586 Note that this doesn't exactly match the NT semantics for an ACL. As POSIX entries
2587 are not ordered, and match on the most specific entry rather than walking a list,
2588 then a simple POSIX permission of rw-r--r-- should really map to 5 entries,
2589
2590 Entry 0: owner : deny all except read and write.
2591 Entry 1: owner : allow read and write.
2592 Entry 2: group : deny all except read.
2593 Entry 3: group : allow read.
2594 Entry 4: Everyone : allow read.
2595
2596 But NT cannot display this in their ACL editor !
2597 ********************************************************************************/
2598
2599 static void arrange_posix_perms(const char *filename, canon_ace **pp_list_head)
2600 {
2601 canon_ace *l_head = *pp_list_head;
2602 canon_ace *owner_ace = NULL;
2603 canon_ace *other_ace = NULL;
2604 canon_ace *ace = NULL;
2605
2606 for (ace = l_head; ace; ace = ace->next) {
2607 if (ace->type == SMB_ACL_USER_OBJ)
2608 owner_ace = ace;
2609 else if (ace->type == SMB_ACL_OTHER) {
2610 /* Last ace - this is "other" */
2611 other_ace = ace;
2612 }
2613 }
2614
2615 if (!owner_ace || !other_ace) {
2616 DEBUG(0,("arrange_posix_perms: Invalid POSIX permissions for file %s, missing owner or other.\n",
2617 filename ));
2618 return;
2619 }
2620
2621 /*
2622 * The POSIX algorithm applies to owner first, and other last,
2623 * so ensure they are arranged in this order.
2624 */
2625
2626 if (owner_ace) {
2627 DLIST_PROMOTE(l_head, owner_ace);
2628 }
2629
2630 if (other_ace) {
2631 DLIST_DEMOTE(l_head, other_ace);
2632 }
2633
2634 /* We have probably changed the head of the list. */
2635
2636 *pp_list_head = l_head;
2637 }
2638
2639 /****************************************************************************
2640 Create a linked list of canonical ACE entries.
2641 ****************************************************************************/
2642
2643 static canon_ace *canonicalise_acl(struct connection_struct *conn,
2644 const char *fname, SMB_ACL_T posix_acl,
2645 const SMB_STRUCT_STAT *psbuf,
2646 const struct dom_sid *powner, const struct dom_sid *pgroup, struct pai_val *pal, SMB_ACL_TYPE_T the_acl_type)
2647 {
2648 mode_t acl_mask = (S_IRUSR|S_IWUSR|S_IXUSR);
2649 canon_ace *l_head = NULL;
2650 canon_ace *ace = NULL;
2651 canon_ace *next_ace = NULL;
2652 int entry_id = SMB_ACL_FIRST_ENTRY;
2653 bool is_default_acl = (the_acl_type == SMB_ACL_TYPE_DEFAULT);
2654 SMB_ACL_ENTRY_T entry;
2655 size_t ace_count;
2656
2657 while ( posix_acl && (sys_acl_get_entry(posix_acl, entry_id, &entry) == 1)) {
2658 SMB_ACL_TAG_T tagtype;
2659 SMB_ACL_PERMSET_T permset;
2660 struct dom_sid sid;
2661 struct unixid unix_ug;
2662 enum ace_owner owner_type;
2663
2664 entry_id = SMB_ACL_NEXT_ENTRY;
2665
2666 if (sys_acl_get_tag_type(entry, &tagtype) == -1)
2667 continue;
2668
2669 if (sys_acl_get_permset(entry, &permset) == -1)
2670 continue;
2671
2672 /* Decide which SID to use based on the ACL type. */
2673 switch(tagtype) {
2674 case SMB_ACL_USER_OBJ:
2675 /* Get the SID from the owner. */
2676 sid_copy(&sid, powner);
2677 unix_ug.type = ID_TYPE_UID;
2678 unix_ug.id = psbuf->st_ex_uid;
2679 owner_type = UID_ACE;
2680 break;
2681 case SMB_ACL_USER:
2682 {
2683 uid_t *puid = (uid_t *)sys_acl_get_qualifier(entry);
2684 if (puid == NULL) {
2685 DEBUG(0,("canonicalise_acl: Failed to get uid.\n"));
2686 continue;
2687 }
2688 uid_to_sid( &sid, *puid);
2689 unix_ug.type = ID_TYPE_UID;
2690 unix_ug.id = *puid;
2691 owner_type = UID_ACE;
2692 break;
2693 }
2694 case SMB_ACL_GROUP_OBJ:
2695 /* Get the SID from the owning group. */
2696 sid_copy(&sid, pgroup);
2697 unix_ug.type = ID_TYPE_GID;
2698 unix_ug.id = psbuf->st_ex_gid;
2699 owner_type = GID_ACE;
2700 break;
2701 case SMB_ACL_GROUP:
2702 {
2703 gid_t *pgid = (gid_t *)sys_acl_get_qualifier(entry);
2704 if (pgid == NULL) {
2705 DEBUG(0,("canonicalise_acl: Failed to get gid.\n"));
2706 continue;
2707 }
2708 gid_to_sid( &sid, *pgid);
2709 unix_ug.type = ID_TYPE_GID;
2710 unix_ug.id = *pgid;
2711 owner_type = GID_ACE;
2712 break;
2713 }
2714 case SMB_ACL_MASK:
2715 acl_mask = convert_permset_to_mode_t(permset);
2716 continue; /* Don't count the mask as an entry. */
2717 case SMB_ACL_OTHER:
2718 /* Use the Everyone SID */
2719 sid = global_sid_World;
2720 unix_ug.type = ID_TYPE_NOT_SPECIFIED;
2721 unix_ug.id = -1;
2722 owner_type = WORLD_ACE;
2723 break;
2724 default:
2725 DEBUG(0,("canonicalise_acl: Unknown tagtype %u\n", (unsigned int)tagtype));
2726 continue;
2727 }
2728
2729 /*
2730 * Add this entry to the list.
2731 */
2732
2733 if ((ace = talloc(talloc_tos(), canon_ace)) == NULL)
2734 goto fail;
2735
2736 *ace = (canon_ace) {
2737 .type = tagtype,
2738 .perms = convert_permset_to_mode_t(permset),
2739 .attr = ALLOW_ACE,
2740 .trustee = sid,
2741 .unix_ug = unix_ug,
2742 .owner_type = owner_type
2743 };
2744 ace->ace_flags = get_pai_flags(pal, ace, is_default_acl);
2745
2746 DLIST_ADD(l_head, ace);
2747 }
2748
2749 /*
2750 * This next call will ensure we have at least a user/group/world set.
2751 */
2752
2753 if (!ensure_canon_entry_valid_on_get(conn, &l_head,
2754 powner, pgroup,
2755 psbuf))
2756 goto fail;
2757
2758 /*
2759 * Now go through the list, masking the permissions with the
2760 * acl_mask. Ensure all DENY Entries are at the start of the list.
2761 */
2762
2763 DEBUG(10,("canonicalise_acl: %s ace entries before arrange :\n", is_default_acl ? "Default" : "Access"));
2764
2765 for ( ace_count = 0, ace = l_head; ace; ace = next_ace, ace_count++) {
2766 next_ace = ace->next;
2767
2768 /* Masks are only applied to entries other than USER_OBJ and OTHER. */
2769 if (ace->type != SMB_ACL_OTHER && ace->type != SMB_ACL_USER_OBJ)
2770 ace->perms &= acl_mask;
2771
2772 if (ace->perms == 0) {
2773 DLIST_PROMOTE(l_head, ace);
2774 }
2775
2776 if( DEBUGLVL( 10 ) ) {
2777 print_canon_ace(ace, ace_count);
2778 }
2779 }
2780
2781 arrange_posix_perms(fname,&l_head );
2782
2783 print_canon_ace_list( "canonicalise_acl: ace entries after arrange", l_head );
2784
2785 return l_head;
2786
2787 fail:
2788
2789 free_canon_ace_list(l_head);
2790 return NULL;
2791 }
2792
2793 /****************************************************************************
2794 Check if the current user group list contains a given group.
2795 ****************************************************************************/
2796
2797 bool current_user_in_group(connection_struct *conn, gid_t gid)
2798 {
2799 uint32_t i;
2800 const struct security_unix_token *utok = get_current_utok(conn);
2801
2802 for (i = 0; i < utok->ngroups; i++) {
2803 if (utok->groups[i] == gid) {
2804 return True;
2805 }
2806 }
2807
2808 return False;
2809 }
2810
2811 /****************************************************************************
2812 Should we override a deny ? Check 'acl group control' and 'dos filemode'.
2813 ****************************************************************************/
2814
2815 static bool acl_group_override(connection_struct *conn,
2816 const struct smb_filename *smb_fname)
2817 {
2818 if ((errno != EPERM) && (errno != EACCES)) {
2819 return false;
2820 }
2821
2822 /* file primary group == user primary or supplementary group */
2823 if (lp_acl_group_control(SNUM(conn)) &&
2824 current_user_in_group(conn, smb_fname->st.st_ex_gid)) {
2825 return true;
2826 }
2827
2828 /* user has writeable permission */
2829 if (lp_dos_filemode(SNUM(conn)) &&
2830 can_write_to_file(conn, smb_fname)) {
2831 return true;
2832 }
2833
2834 return false;
2835 }
2836
2837 /****************************************************************************
2838 Attempt to apply an ACL to a file or directory.
2839 ****************************************************************************/
2840
2841 static bool set_canon_ace_list(files_struct *fsp,
2842 canon_ace *the_ace,
2843 bool default_ace,
2844 const SMB_STRUCT_STAT *psbuf,
2845 bool *pacl_set_support)
2846 {
2847 connection_struct *conn = fsp->conn;
2848 bool ret = False;
2849 SMB_ACL_T the_acl = sys_acl_init(talloc_tos());
2850 canon_ace *p_ace;
2851 int i;
2852 SMB_ACL_ENTRY_T mask_entry;
2853 bool got_mask_entry = False;
2854 SMB_ACL_PERMSET_T mask_permset;
2855 SMB_ACL_TYPE_T the_acl_type = (default_ace ? SMB_ACL_TYPE_DEFAULT : SMB_ACL_TYPE_ACCESS);
2856 bool needs_mask = False;
2857 mode_t mask_perms = 0;
2858
2859 /* Use the psbuf that was passed in. */
2860 if (psbuf != &fsp->fsp_name->st) {
2861 fsp->fsp_name->st = *psbuf;
2862 }
2863
2864 #if defined(POSIX_ACL_NEEDS_MASK)
2865 /* HP-UX always wants to have a mask (called "class" there). */
2866 needs_mask = True;
2867 #endif
2868
2869 if (the_acl == NULL) {
2870 DEBUG(0, ("sys_acl_init failed to allocate an ACL\n"));
2871 return false;
2872 }
2873
2874 if( DEBUGLVL( 10 )) {
2875 dbgtext("set_canon_ace_list: setting ACL:\n");
2876 for (i = 0, p_ace = the_ace; p_ace; p_ace = p_ace->next, i++ ) {
2877 print_canon_ace( p_ace, i);
2878 }
2879 }
2880
2881 for (i = 0, p_ace = the_ace; p_ace; p_ace = p_ace->next, i++ ) {
2882 SMB_ACL_ENTRY_T the_entry;
2883 SMB_ACL_PERMSET_T the_permset;
2884
2885 /*
2886 * ACLs only "need" an ACL_MASK entry if there are any named user or
2887 * named group entries. But if there is an ACL_MASK entry, it applies
2888 * to ACL_USER, ACL_GROUP, and ACL_GROUP_OBJ entries. Set the mask
2889 * so that it doesn't deny (i.e., mask off) any permissions.
2890 */
2891
2892 if (p_ace->type == SMB_ACL_USER || p_ace->type == SMB_ACL_GROUP) {
2893 needs_mask = True;
2894 mask_perms |= p_ace->perms;
2895 } else if (p_ace->type == SMB_ACL_GROUP_OBJ) {
2896 mask_perms |= p_ace->perms;
2897 }
2898
2899 /*
2900 * Get the entry for this ACE.
2901 */
2902
2903 if (sys_acl_create_entry(&the_acl, &the_entry) == -1) {
2904 DEBUG(0,("set_canon_ace_list: Failed to create entry %d. (%s)\n",
2905 i, strerror(errno) ));
2906 goto fail;
2907 }
2908
2909 if (p_ace->type == SMB_ACL_MASK) {
2910 mask_entry = the_entry;
2911 got_mask_entry = True;
2912 }
2913
2914 /*
2915 * Ok - we now know the ACL calls should be working, don't
2916 * allow fallback to chmod.
2917 */
2918
2919 *pacl_set_support = True;
2920
2921 /*
2922 * Initialise the entry from the canon_ace.
2923 */
2924
2925 /*
2926 * First tell the entry what type of ACE this is.
2927 */
2928
2929 if (sys_acl_set_tag_type(the_entry, p_ace->type) == -1) {
2930 DEBUG(0,("set_canon_ace_list: Failed to set tag type on entry %d. (%s)\n",
2931 i, strerror(errno) ));
2932 goto fail;
2933 }
2934
2935 /*
2936 * Only set the qualifier (user or group id) if the entry is a user
2937 * or group id ACE.
2938 */
2939
2940 if ((p_ace->type == SMB_ACL_USER) || (p_ace->type == SMB_ACL_GROUP)) {
2941 if (sys_acl_set_qualifier(the_entry,(void *)&p_ace->unix_ug.id) == -1) {
2942 DEBUG(0,("set_canon_ace_list: Failed to set qualifier on entry %d. (%s)\n",
2943 i, strerror(errno) ));
2944 goto fail;
2945 }
2946 }
2947
2948 /*
2949 * Convert the mode_t perms in the canon_ace to a POSIX permset.
2950 */
2951
2952 if (sys_acl_get_permset(the_entry, &the_permset) == -1) {
2953 DEBUG(0,("set_canon_ace_list: Failed to get permset on entry %d. (%s)\n",
2954 i, strerror(errno) ));
2955 goto fail;
2956 }
2957
2958 if (map_acl_perms_to_permset(p_ace->perms, &the_permset) == -1) {
2959 DEBUG(0,("set_canon_ace_list: Failed to create permset for mode (%u) on entry %d. (%s)\n",
2960 (unsigned int)p_ace->perms, i, strerror(errno) ));
2961 goto fail;
2962 }
2963
2964 /*
2965 * ..and apply them to the entry.
2966 */
2967
2968 if (sys_acl_set_permset(the_entry, the_permset) == -1) {
2969 DEBUG(0,("set_canon_ace_list: Failed to add permset on entry %d. (%s)\n",
2970 i, strerror(errno) ));
2971 goto fail;
2972 }
2973
2974 if( DEBUGLVL( 10 ))
2975 print_canon_ace( p_ace, i);
2976
2977 }
2978
2979 if (needs_mask && !got_mask_entry) {
2980 if (sys_acl_create_entry(&the_acl, &mask_entry) == -1) {
2981 DEBUG(0,("set_canon_ace_list: Failed to create mask entry. (%s)\n", strerror(errno) ));
2982 goto fail;
2983 }
2984
2985 if (sys_acl_set_tag_type(mask_entry, SMB_ACL_MASK) == -1) {
2986 DEBUG(0,("set_canon_ace_list: Failed to set tag type on mask entry. (%s)\n",strerror(errno) ));
2987 goto fail;
2988 }
2989
2990 if (sys_acl_get_permset(mask_entry, &mask_permset) == -1) {
2991 DEBUG(0,("set_canon_ace_list: Failed to get mask permset. (%s)\n", strerror(errno) ));
2992 goto fail;
2993 }
2994
2995 if (map_acl_perms_to_permset(S_IRUSR|S_IWUSR|S_IXUSR, &mask_permset) == -1) {
2996 DEBUG(0,("set_canon_ace_list: Failed to create mask permset. (%s)\n", strerror(errno) ));
2997 goto fail;
2998 }
2999
3000 if (sys_acl_set_permset(mask_entry, mask_permset) == -1) {
3001 DEBUG(0,("set_canon_ace_list: Failed to add mask permset. (%s)\n", strerror(errno) ));
3002 goto fail;
3003 }
3004 }
3005
3006 /*
3007 * Finally apply it to the file or directory.
3008 */
3009
3010 if(default_ace || fsp->is_directory || fsp->fh->fd == -1) {
3011 if (SMB_VFS_SYS_ACL_SET_FILE(conn, fsp->fsp_name,
3012 the_acl_type, the_acl) == -1) {
3013 /*
3014 * Some systems allow all the above calls and only fail with no ACL support
3015 * when attempting to apply the acl. HPUX with HFS is an example of this. JRA.
3016 */
3017 if (no_acl_syscall_error(errno)) {
3018 *pacl_set_support = False;
3019 }
3020
3021 if (acl_group_override(conn, fsp->fsp_name)) {
3022 int sret;
3023
3024 DEBUG(5,("set_canon_ace_list: acl group "
3025 "control on and current user in file "
3026 "%s primary group.\n",
3027 fsp_str_dbg(fsp)));
3028
3029 become_root();
3030 sret = SMB_VFS_SYS_ACL_SET_FILE(conn,
3031 fsp->fsp_name, the_acl_type,
3032 the_acl);
3033 unbecome_root();
3034 if (sret == 0) {
3035 ret = True;
3036 }
3037 }
3038
3039 if (ret == False) {
3040 DEBUG(2,("set_canon_ace_list: "
3041 "sys_acl_set_file type %s failed for "
3042 "file %s (%s).\n",
3043 the_acl_type == SMB_ACL_TYPE_DEFAULT ?
3044 "directory default" : "file",
3045 fsp_str_dbg(fsp), strerror(errno)));
3046 goto fail;
3047 }
3048 }
3049 } else {
3050 if (SMB_VFS_SYS_ACL_SET_FD(fsp, the_acl) == -1) {
3051 /*
3052 * Some systems allow all the above calls and only fail with no ACL support
3053 * when attempting to apply the acl. HPUX with HFS is an example of this. JRA.
3054 */
3055 if (no_acl_syscall_error(errno)) {
3056 *pacl_set_support = False;
3057 }
3058
3059 if (acl_group_override(conn, fsp->fsp_name)) {
3060 int sret;
3061
3062 DEBUG(5,("set_canon_ace_list: acl group "
3063 "control on and current user in file "
3064 "%s primary group.\n",
3065 fsp_str_dbg(fsp)));
3066
3067 become_root();
3068 sret = SMB_VFS_SYS_ACL_SET_FD(fsp, the_acl);
3069 unbecome_root();
3070 if (sret == 0) {
3071 ret = True;
3072 }
3073 }
3074
3075 if (ret == False) {
3076 DEBUG(2,("set_canon_ace_list: "
3077 "sys_acl_set_file failed for file %s "
3078 "(%s).\n",
3079 fsp_str_dbg(fsp), strerror(errno)));
3080 goto fail;
3081 }
3082 }
3083 }
3084
3085 ret = True;
3086
3087 fail:
3088
3089 if (the_acl != NULL) {
3090 TALLOC_FREE(the_acl);
3091 }
3092
3093 return ret;
3094 }
3095
3096 /****************************************************************************
3097
3098 ****************************************************************************/
3099
3100 SMB_ACL_T free_empty_sys_acl(connection_struct *conn, SMB_ACL_T the_acl)
3101 {
3102 SMB_ACL_ENTRY_T entry;
3103
3104 if (!the_acl)
3105 return NULL;
3106 if (sys_acl_get_entry(the_acl, SMB_ACL_FIRST_ENTRY, &entry) != 1) {
3107 TALLOC_FREE(the_acl);
3108 return NULL;
3109 }
3110 return the_acl;
3111 }
3112
3113 /****************************************************************************
3114 Convert a canon_ace to a generic 3 element permission - if possible.
3115 ****************************************************************************/
3116
3117 #define MAP_PERM(p,mask,result) (((p) & (mask)) ? (result) : 0 )
3118
3119 static bool convert_canon_ace_to_posix_perms( files_struct *fsp, canon_ace *file_ace_list, mode_t *posix_perms)
3120 {
3121 size_t ace_count = count_canon_ace_list(file_ace_list);
3122 canon_ace *ace_p;
3123 canon_ace *owner_ace = NULL;
3124 canon_ace *group_ace = NULL;
3125 canon_ace *other_ace = NULL;
3126
3127 if (ace_count > 5) {
3128 DEBUG(3,("convert_canon_ace_to_posix_perms: Too many ACE "
3129 "entries for file %s to convert to posix perms.\n",
3130 fsp_str_dbg(fsp)));
3131 return False;
3132 }
3133
3134 for (ace_p = file_ace_list; ace_p; ace_p = ace_p->next) {
3135 if (ace_p->owner_type == UID_ACE)
3136 owner_ace = ace_p;
3137 else if (ace_p->owner_type == GID_ACE)
3138 group_ace = ace_p;
3139 else if (ace_p->owner_type == WORLD_ACE)
3140 other_ace = ace_p;
3141 }
3142
3143 if (!owner_ace || !group_ace || !other_ace) {
3144 DEBUG(3,("convert_canon_ace_to_posix_perms: Can't get "
3145 "standard entries for file %s.\n", fsp_str_dbg(fsp)));
3146 return False;
3147 }
3148
3149 /*
3150 * Ensure all ACE entries are owner, group or other.
3151 * We can't set if there are any other SIDs.
3152 */
3153 for (ace_p = file_ace_list; ace_p; ace_p = ace_p->next) {
3154 if (ace_p == owner_ace || ace_p == group_ace ||
3155 ace_p == other_ace) {
3156 continue;
3157 }
3158 if (ace_p->owner_type == UID_ACE) {
3159 if (ace_p->unix_ug.id != owner_ace->unix_ug.id) {
3160 DEBUG(3,("Invalid uid %u in ACE for file %s.\n",
3161 (unsigned int)ace_p->unix_ug.id,
3162 fsp_str_dbg(fsp)));
3163 return false;
3164 }
3165 } else if (ace_p->owner_type == GID_ACE) {
3166 if (ace_p->unix_ug.id != group_ace->unix_ug.id) {
3167 DEBUG(3,("Invalid gid %u in ACE for file %s.\n",
3168 (unsigned int)ace_p->unix_ug.id,
3169 fsp_str_dbg(fsp)));
3170 return false;
3171 }
3172 } else {
3173 /*
3174 * There should be no duplicate WORLD_ACE entries.
3175 */
3176
3177 DEBUG(3,("Invalid type %u, uid %u in "
3178 "ACE for file %s.\n",
3179 (unsigned int)ace_p->owner_type,
3180 (unsigned int)ace_p->unix_ug.id,
3181 fsp_str_dbg(fsp)));
3182 return false;
3183 }
3184 }
3185
3186 *posix_perms = (mode_t)0;
3187
3188 *posix_perms |= owner_ace->perms;
3189 *posix_perms |= MAP_PERM(group_ace->perms, S_IRUSR, S_IRGRP);
3190 *posix_perms |= MAP_PERM(group_ace->perms, S_IWUSR, S_IWGRP);
3191 *posix_perms |= MAP_PERM(group_ace->perms, S_IXUSR, S_IXGRP);
3192 *posix_perms |= MAP_PERM(other_ace->perms, S_IRUSR, S_IROTH);
3193 *posix_perms |= MAP_PERM(other_ace->perms, S_IWUSR, S_IWOTH);
3194 *posix_perms |= MAP_PERM(other_ace->perms, S_IXUSR, S_IXOTH);
3195
3196 /* The owner must have at least read access. */
3197
3198 *posix_perms |= S_IRUSR;
3199 if (fsp->is_directory)
3200 *posix_perms |= (S_IWUSR|S_IXUSR);
3201
3202 DEBUG(10,("convert_canon_ace_to_posix_perms: converted u=%o,g=%o,w=%o "
3203 "to perm=0%o for file %s.\n", (int)owner_ace->perms,
3204 (int)group_ace->perms, (int)other_ace->perms,
3205 (int)*posix_perms, fsp_str_dbg(fsp)));
3206
3207 return True;
3208 }
3209
3210 /****************************************************************************
3211 Incoming NT ACLs on a directory can be split into a default POSIX acl (CI|OI|IO) and
3212 a normal POSIX acl. Win2k needs these split acls re-merging into one ACL
3213 with CI|OI set so it is inherited and also applies to the directory.
3214 Based on code from "Jim McDonough" <jmcd@us.ibm.com>.
3215 ****************************************************************************/
3216
3217 static size_t merge_default_aces( struct security_ace *nt_ace_list, size_t num_aces)
3218 {
3219 size_t i, j;
3220
3221 for (i = 0; i < num_aces; i++) {
3222 for (j = i+1; j < num_aces; j++) {
3223 uint32_t i_flags_ni = (nt_ace_list[i].flags & ~SEC_ACE_FLAG_INHERITED_ACE);
3224 uint32_t j_flags_ni = (nt_ace_list[j].flags & ~SEC_ACE_FLAG_INHERITED_ACE);
3225 bool i_inh = (nt_ace_list[i].flags & SEC_ACE_FLAG_INHERITED_ACE) ? True : False;
3226 bool j_inh = (nt_ace_list[j].flags & SEC_ACE_FLAG_INHERITED_ACE) ? True : False;
3227
3228 /* We know the lower number ACE's are file entries. */
3229 if ((nt_ace_list[i].type == nt_ace_list[j].type) &&
3230 (nt_ace_list[i].size == nt_ace_list[j].size) &&
3231 (nt_ace_list[i].access_mask == nt_ace_list[j].access_mask) &&
3232 dom_sid_equal(&nt_ace_list[i].trustee, &nt_ace_list[j].trustee) &&
3233 (i_inh == j_inh) &&
3234 (i_flags_ni == 0) &&
3235 (j_flags_ni == (SEC_ACE_FLAG_OBJECT_INHERIT|
3236 SEC_ACE_FLAG_CONTAINER_INHERIT|
3237 SEC_ACE_FLAG_INHERIT_ONLY))) {
3238 /*
3239 * W2K wants to have access allowed zero access ACE's
3240 * at the end of the list. If the mask is zero, merge
3241 * the non-inherited ACE onto the inherited ACE.
3242 */
3243
3244 if (nt_ace_list[i].access_mask == 0) {
3245 nt_ace_list[j].flags = SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT|
3246 (i_inh ? SEC_ACE_FLAG_INHERITED_ACE : 0);
3247 if (num_aces - i - 1 > 0)
3248 memmove(&nt_ace_list[i], &nt_ace_list[i+1], (num_aces-i-1) *
3249 sizeof(struct security_ace));
3250
3251 DEBUG(10,("merge_default_aces: Merging zero access ACE %u onto ACE %u.\n",
3252 (unsigned int)i, (unsigned int)j ));
3253 } else {
3254 /*
3255 * These are identical except for the flags.
3256 * Merge the inherited ACE onto the non-inherited ACE.
3257 */
3258
3259 nt_ace_list[i].flags = SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT|
3260 (i_inh ? SEC_ACE_FLAG_INHERITED_ACE : 0);
3261 if (num_aces - j - 1 > 0)
3262 memmove(&nt_ace_list[j], &nt_ace_list[j+1], (num_aces-j-1) *
3263 sizeof(struct security_ace));
3264
3265 DEBUG(10,("merge_default_aces: Merging ACE %u onto ACE %u.\n",
3266 (unsigned int)j, (unsigned int)i ));
3267 }
3268 num_aces--;
3269 break;
3270 }
3271 }
3272 }
3273
3274 return num_aces;
3275 }
3276
3277
3278 /****************************************************************************
3279 Reply to query a security descriptor from an fsp. If it succeeds it allocates
3280 the space for the return elements and returns the size needed to return the
3281 security descriptor. This should be the only external function needed for
3282 the UNIX style get ACL.
3283 ****************************************************************************/
3284
3285 static NTSTATUS posix_get_nt_acl_common(struct connection_struct *conn,
3286 const char *name,
3287 const SMB_STRUCT_STAT *sbuf,
3288 struct pai_val *pal,
3289 SMB_ACL_T posix_acl,
3290 SMB_ACL_T def_acl,
3291 uint32_t security_info,
3292 TALLOC_CTX *mem_ctx,
3293 struct security_descriptor **ppdesc)
3294 {
3295 struct dom_sid owner_sid;
3296 struct dom_sid group_sid;
3297 size_t sd_size = 0;
3298 struct security_acl *psa = NULL;
3299 size_t num_acls = 0;
3300 size_t num_def_acls = 0;
3301 size_t num_aces = 0;
3302 canon_ace *file_ace = NULL;
3303 canon_ace *dir_ace = NULL;
3304 struct security_ace *nt_ace_list = NULL;
3305 struct security_descriptor *psd = NULL;
3306
3307 /*
3308 * Get the owner, group and world SIDs.
3309 */
3310
3311 create_file_sids(sbuf, &owner_sid, &group_sid);
3312
3313 if (security_info & SECINFO_DACL) {
3314
3315 /*
3316 * In the optimum case Creator Owner and Creator Group would be used for
3317 * the ACL_USER_OBJ and ACL_GROUP_OBJ entries, respectively, but this
3318 * would lead to usability problems under Windows: The Creator entries
3319 * are only available in browse lists of directories and not for files;
3320 * additionally the identity of the owning group couldn't be determined.
3321 * We therefore use those identities only for Default ACLs.
3322 */
3323
3324 /* Create the canon_ace lists. */
3325 file_ace = canonicalise_acl(conn, name, posix_acl, sbuf,
3326 &owner_sid, &group_sid, pal,
3327 SMB_ACL_TYPE_ACCESS);
3328
3329 /* We must have *some* ACLS. */
3330
3331 if (count_canon_ace_list(file_ace) == 0) {
3332 DEBUG(0,("get_nt_acl : No ACLs on file (%s) !\n", name));
3333 goto done;
3334 }
3335
3336 if (S_ISDIR(sbuf->st_ex_mode) && def_acl) {
3337 dir_ace = canonicalise_acl(conn, name, def_acl,
3338 sbuf,
3339 &global_sid_Creator_Owner,
3340 &global_sid_Creator_Group,
3341 pal, SMB_ACL_TYPE_DEFAULT);
3342 }
3343
3344 /*
3345 * Create the NT ACE list from the canonical ace lists.
3346 */
3347
3348 {
3349 canon_ace *ace;
3350 enum security_ace_type nt_acl_type;
3351
3352 num_acls = count_canon_ace_list(file_ace);
3353 num_def_acls = count_canon_ace_list(dir_ace);
3354
3355 nt_ace_list = talloc_zero_array(
3356 talloc_tos(), struct security_ace,
3357 num_acls + num_def_acls);
3358
3359 if (nt_ace_list == NULL) {
3360 DEBUG(0,("get_nt_acl: Unable to malloc space for nt_ace_list.\n"));
3361 goto done;
3362 }
3363
3364 /*
3365 * Create the NT ACE list from the canonical ace lists.
3366 */
3367
3368 for (ace = file_ace; ace != NULL; ace = ace->next) {
3369 uint32_t acc = map_canon_ace_perms(SNUM(conn),
3370 &nt_acl_type,
3371 ace->perms,
3372 S_ISDIR(sbuf->st_ex_mode));
3373 init_sec_ace(&nt_ace_list[num_aces++],
3374 &ace->trustee,
3375 nt_acl_type,
3376 acc,
3377 ace->ace_flags);
3378 }
3379
3380 for (ace = dir_ace; ace != NULL; ace = ace->next) {
3381 uint32_t acc = map_canon_ace_perms(SNUM(conn),
3382 &nt_acl_type,
3383 ace->perms,
3384 S_ISDIR(sbuf->st_ex_mode));
3385 init_sec_ace(&nt_ace_list[num_aces++],
3386 &ace->trustee,
3387 nt_acl_type,
3388 acc,
3389 ace->ace_flags |
3390 SEC_ACE_FLAG_OBJECT_INHERIT|
3391 SEC_ACE_FLAG_CONTAINER_INHERIT|
3392 SEC_ACE_FLAG_INHERIT_ONLY);
3393 }
3394
3395 /*
3396 * Merge POSIX default ACLs and normal ACLs into one NT ACE.
3397 * Win2K needs this to get the inheritance correct when replacing ACLs
3398 * on a directory tree. Based on work by Jim @ IBM.
3399 */
3400
3401 num_aces = merge_default_aces(nt_ace_list, num_aces);
3402 }
3403
3404 if (num_aces) {
3405 if((psa = make_sec_acl( talloc_tos(), NT4_ACL_REVISION, num_aces, nt_ace_list)) == NULL) {
3406 DEBUG(0,("get_nt_acl: Unable to malloc space for acl.\n"));
3407 goto done;
3408 }
3409 }
3410 } /* security_info & SECINFO_DACL */
3411
3412 psd = make_standard_sec_desc(mem_ctx,
3413 (security_info & SECINFO_OWNER) ? &owner_sid : NULL,
3414 (security_info & SECINFO_GROUP) ? &group_sid : NULL,
3415 psa,
3416 &sd_size);
3417
3418 if(!psd) {
3419 DEBUG(0,("get_nt_acl: Unable to malloc space for security descriptor.\n"));
3420 sd_size = 0;
3421 goto done;
3422 }
3423
3424 /*
3425 * Windows 2000: The DACL_PROTECTED flag in the security
3426 * descriptor marks the ACL as non-inheriting, i.e., no
3427 * ACEs from higher level directories propagate to this
3428 * ACL. In the POSIX ACL model permissions are only
3429 * inherited at file create time, so ACLs never contain
3430 * any ACEs that are inherited dynamically. The DACL_PROTECTED
3431 * flag doesn't seem to bother Windows NT.
3432 * Always set this if map acl inherit is turned off.
3433 */
3434 if (pal == NULL || !lp_map_acl_inherit(SNUM(conn))) {
3435 psd->type |= SEC_DESC_DACL_PROTECTED;
3436 } else {
3437 psd->type |= pal->sd_type;
3438 }
3439
3440 if (psd->dacl) {
3441 dacl_sort_into_canonical_order(psd->dacl->aces, (unsigned int)psd->dacl->num_aces);
3442 }
3443
3444 *ppdesc = psd;
3445
3446 done:
3447
3448 if (posix_acl) {
3449 TALLOC_FREE(posix_acl);
3450 }
3451 if (def_acl) {
3452 TALLOC_FREE(def_acl);
3453 }
3454 free_canon_ace_list(file_ace);
3455 free_canon_ace_list(dir_ace);
3456 free_inherited_info(pal);
3457 TALLOC_FREE(nt_ace_list);
3458
3459 return NT_STATUS_OK;
3460 }
3461
3462 NTSTATUS posix_fget_nt_acl(struct files_struct *fsp, uint32_t security_info,
3463 TALLOC_CTX *mem_ctx,
3464 struct security_descriptor **ppdesc)
3465 {
3466 SMB_STRUCT_STAT sbuf;
3467 SMB_ACL_T posix_acl = NULL;
3468 struct pai_val *pal;
3469 TALLOC_CTX *frame = talloc_stackframe();
3470 NTSTATUS status;
3471
3472 *ppdesc = NULL;
3473
3474 DEBUG(10,("posix_fget_nt_acl: called for file %s\n",
3475 fsp_str_dbg(fsp)));
3476
3477 /* can it happen that fsp_name == NULL ? */
3478 if (fsp->is_directory || fsp->fh->fd == -1) {
3479 status = posix_get_nt_acl(fsp->conn, fsp->fsp_name,
3480 security_info, mem_ctx, ppdesc);
3481 TALLOC_FREE(frame);
3482 return status;
3483 }
3484
3485 /* Get the stat struct for the owner info. */
3486 if(SMB_VFS_FSTAT(fsp, &sbuf) != 0) {
3487 TALLOC_FREE(frame);
3488 return map_nt_error_from_unix(errno);
3489 }
3490
3491 /* Get the ACL from the fd. */
3492 posix_acl = SMB_VFS_SYS_ACL_GET_FD(fsp, frame);
3493
3494 pal = fload_inherited_info(fsp);
3495
3496 status = posix_get_nt_acl_common(fsp->conn, fsp->fsp_name->base_name,
3497 &sbuf, pal, posix_acl, NULL,
3498 security_info, mem_ctx, ppdesc);
3499 TALLOC_FREE(frame);
3500 return status;
3501 }
3502
3503 NTSTATUS posix_get_nt_acl(struct connection_struct *conn,
3504 const struct smb_filename *smb_fname_in,
3505 uint32_t security_info,
3506 TALLOC_CTX *mem_ctx,
3507 struct security_descriptor **ppdesc)
3508 {
3509 SMB_ACL_T posix_acl = NULL;
3510 SMB_ACL_T def_acl = NULL;
3511 struct pai_val *pal;
3512 struct smb_filename *smb_fname = NULL;
3513 int ret;
3514 TALLOC_CTX *frame = talloc_stackframe();
3515 NTSTATUS status;
3516
3517 *ppdesc = NULL;
3518
3519 DEBUG(10,("posix_get_nt_acl: called for file %s\n",
3520 smb_fname_in->base_name ));
3521
3522 smb_fname = cp_smb_filename(talloc_tos(), smb_fname_in);
3523 if (smb_fname == NULL) {
3524 TALLOC_FREE(frame);
3525 return NT_STATUS_NO_MEMORY;
3526 }
3527
3528 /* Get the stat struct for the owner info. */
3529 /*
3530 * We can directly use SMB_VFS_STAT here, as if this was a
3531 * POSIX call on a symlink, we've already refused it.
3532 * For a Windows acl mapped call on a symlink, we want to follow
3533 * it.
3534 */
3535 ret = SMB_VFS_STAT(conn, smb_fname);
3536
3537 if (ret == -1) {
3538 TALLOC_FREE(frame);
3539 return map_nt_error_from_unix(errno);
3540 }
3541
3542 /* Get the ACL from the path. */
3543 posix_acl = SMB_VFS_SYS_ACL_GET_FILE(conn, smb_fname,
3544 SMB_ACL_TYPE_ACCESS, frame);
3545
3546 /* If it's a directory get the default POSIX ACL. */
3547 if(S_ISDIR(smb_fname->st.st_ex_mode)) {
3548 def_acl = SMB_VFS_SYS_ACL_GET_FILE(conn, smb_fname,
3549 SMB_ACL_TYPE_DEFAULT, frame);
3550 def_acl = free_empty_sys_acl(conn, def_acl);
3551 }
3552
3553 pal = load_inherited_info(conn, smb_fname);
3554
3555 status = posix_get_nt_acl_common(conn,
3556 smb_fname->base_name,
3557 &smb_fname->st,
3558 pal,
3559 posix_acl,
3560 def_acl,
3561 security_info,
3562 mem_ctx,
3563 ppdesc);
3564 TALLOC_FREE(frame);
3565 return status;
3566 }
3567
3568 /****************************************************************************
3569 Try to chown a file. We will be able to chown it under the following conditions.
3570
3571 1) If we have root privileges, then it will just work.
3572 2) If we have SeRestorePrivilege we can change the user + group to any other user.
3573 3) If we have SeTakeOwnershipPrivilege we can change the user to the current user.
3574 4) If we have write permission to the file and dos_filemodes is set
3575 then allow chown to the currently authenticated user.
3576 ****************************************************************************/
3577
3578 NTSTATUS try_chown(files_struct *fsp, uid_t uid, gid_t gid)
3579 {
3580 NTSTATUS status;
3581
3582 if(!CAN_WRITE(fsp->conn)) {
3583 return NT_STATUS_MEDIA_WRITE_PROTECTED;
3584 }
3585
3586 /* Case (1). */
3587 status = vfs_chown_fsp(fsp, uid, gid);
3588 if (NT_STATUS_IS_OK(status)) {
3589 return status;
3590 }
3591
3592 /* Case (2) / (3) */
3593 if (lp_enable_privileges()) {
3594 bool has_take_ownership_priv = security_token_has_privilege(
3595 get_current_nttok(fsp->conn),
3596 SEC_PRIV_TAKE_OWNERSHIP);
3597 bool has_restore_priv = security_token_has_privilege(
3598 get_current_nttok(fsp->conn),
3599 SEC_PRIV_RESTORE);
3600
3601 if (has_restore_priv) {
3602 ; /* Case (2) */
3603 } else if (has_take_ownership_priv) {
3604 /* Case (3) */
3605 if (uid == get_current_uid(fsp->conn)) {
3606 gid = (gid_t)-1;
3607 } else {
3608 has_take_ownership_priv = false;
3609 }
3610 }
3611
3612 if (has_take_ownership_priv || has_restore_priv) {
3613 become_root();
3614 status = vfs_chown_fsp(fsp, uid, gid);
3615 unbecome_root();
3616 return status;
3617 }
3618 }
3619
3620 /* Case (4). */
3621 if (!lp_dos_filemode(SNUM(fsp->conn))) {
3622 return NT_STATUS_ACCESS_DENIED;
3623 }
3624
3625 /* only allow chown to the current user. This is more secure,
3626 and also copes with the case where the SID in a take ownership ACL is
3627 a local SID on the users workstation
3628 */
3629 if (uid != get_current_uid(fsp->conn)) {
3630 return NT_STATUS_INVALID_OWNER;
3631 }
3632
3633 become_root();
3634 /* Keep the current file gid the same. */
3635 status = vfs_chown_fsp(fsp, uid, (gid_t)-1);
3636 unbecome_root();
3637
3638 return status;
3639 }
3640
3641 /****************************************************************************
3642 Reply to set a security descriptor on an fsp. security_info_sent is the
3643 description of the following NT ACL.
3644 This should be the only external function needed for the UNIX style set ACL.
3645 We make a copy of psd_orig as internal functions modify the elements inside
3646 it, even though it's a const pointer.
3647 ****************************************************************************/
3648
3649 NTSTATUS set_nt_acl(files_struct *fsp, uint32_t security_info_sent, const struct security_descriptor *psd_orig)
3650 {
3651 connection_struct *conn = fsp->conn;
3652 uid_t user = (uid_t)-1;
3653 gid_t grp = (gid_t)-1;
3654 struct dom_sid file_owner_sid;
3655 struct dom_sid file_grp_sid;
3656 canon_ace *file_ace_list = NULL;
3657 canon_ace *dir_ace_list = NULL;
3658 bool acl_perms = False;
3659 mode_t orig_mode = (mode_t)0;
3660 NTSTATUS status;
3661 bool set_acl_as_root = false;
3662 bool acl_set_support = false;
3663 bool ret = false;
3664 struct security_descriptor *psd = NULL;
3665
3666 DEBUG(10,("set_nt_acl: called for file %s\n",
3667 fsp_str_dbg(fsp)));
3668
3669 if (!CAN_WRITE(conn)) {
3670 DEBUG(10,("set acl rejected on read-only share\n"));
3671 return NT_STATUS_MEDIA_WRITE_PROTECTED;
3672 }
3673
3674 if (psd_orig == NULL) {
3675 return NT_STATUS_INVALID_PARAMETER;
3676 }
3677
3678 /*
3679 * MS NFS mode, here's the deal: the client merely wants to
3680 * modify the mode, but roundtripping get_acl/set/acl would
3681 * add additional POSIX ACEs. So in case we get a request
3682 * containing a MS NFS mode SID, we do nothing here.
3683 */
3684 if (security_descriptor_with_ms_nfs(psd_orig)) {
3685 return NT_STATUS_OK;
3686 }
3687
3688 psd = security_descriptor_copy(talloc_tos(), psd_orig);
3689 if (psd == NULL) {
3690 return NT_STATUS_NO_MEMORY;
3691 }
3692
3693 /*
3694 * Get the current state of the file.
3695 */
3696
3697 status = vfs_stat_fsp(fsp);
3698 if (!NT_STATUS_IS_OK(status)) {
3699 return status;
3700 }
3701
3702 /* Save the original element we check against. */
3703 orig_mode = fsp->fsp_name->st.st_ex_mode;
3704
3705 /*
3706 * Unpack the user/group/world id's.
3707 */
3708
3709 /* POSIX can't cope with missing owner/group. */
3710 if ((security_info_sent & SECINFO_OWNER) && (psd->owner_sid == NULL)) {
3711 security_info_sent &= ~SECINFO_OWNER;
3712 }
3713 if ((security_info_sent & SECINFO_GROUP) && (psd->group_sid == NULL)) {
3714 security_info_sent &= ~SECINFO_GROUP;
3715 }
3716
3717 /* If UNIX owner is inherited and Windows isn't, then
3718 * setting the UNIX owner based on Windows owner conflicts
3719 * with the inheritance rule
3720 */
3721 if (lp_inherit_owner(SNUM(conn)) == INHERIT_OWNER_UNIX_ONLY) {
3722 security_info_sent &= ~SECINFO_OWNER;
3723 }
3724
3725 status = unpack_nt_owners( conn, &user, &grp, security_info_sent, psd);
3726 if (!NT_STATUS_IS_OK(status)) {
3727 return status;
3728 }
3729
3730 /*
3731 * Do we need to chown ? If so this must be done first as the incoming
3732 * CREATOR_OWNER acl will be relative to the *new* owner, not the old.
3733 * Noticed by Simo.
3734 */
3735
3736 if (((user != (uid_t)-1) && (fsp->fsp_name->st.st_ex_uid != user)) ||
3737 (( grp != (gid_t)-1) && (fsp->fsp_name->st.st_ex_gid != grp))) {
3738
3739 DEBUG(3,("set_nt_acl: chown %s. uid = %u, gid = %u.\n",
3740 fsp_str_dbg(fsp), (unsigned int)user,
3741 (unsigned int)grp));
3742
3743 status = try_chown(fsp, user, grp);
3744 if(!NT_STATUS_IS_OK(status)) {
3745 DEBUG(3,("set_nt_acl: chown %s, %u, %u failed. Error "
3746 "= %s.\n", fsp_str_dbg(fsp),
3747 (unsigned int)user,
3748 (unsigned int)grp,
3749 nt_errstr(status)));
3750 return status;
3751 }
3752
3753 /*
3754 * Recheck the current state of the file, which may have changed.
3755 * (suid/sgid bits, for instance)
3756 */
3757
3758 status = vfs_stat_fsp(fsp);
3759 if (!NT_STATUS_IS_OK(status)) {
3760 return status;
3761 }
3762
3763 /* Save the original element we check against. */
3764 orig_mode = fsp->fsp_name->st.st_ex_mode;
3765
3766 /* If we successfully chowned, we know we must
3767 * be able to set the acl, so do it as root.
3768 */
3769 set_acl_as_root = true;
3770 }
3771
3772 create_file_sids(&fsp->fsp_name->st, &file_owner_sid, &file_grp_sid);
3773
3774 if((security_info_sent & SECINFO_DACL) &&
3775 (psd->type & SEC_DESC_DACL_PRESENT) &&
3776 (psd->dacl == NULL)) {
3777 struct security_ace ace[3];
3778
3779 /* We can't have NULL DACL in POSIX.
3780 Use owner/group/Everyone -> full access. */
3781
3782 init_sec_ace(&ace[0],
3783 &file_owner_sid,
3784 SEC_ACE_TYPE_ACCESS_ALLOWED,
3785 GENERIC_ALL_ACCESS,
3786 0);
3787 init_sec_ace(&ace[1],
3788 &file_grp_sid,
3789 SEC_ACE_TYPE_ACCESS_ALLOWED,
3790 GENERIC_ALL_ACCESS,
3791 0);
3792 init_sec_ace(&ace[2],
3793 &global_sid_World,
3794 SEC_ACE_TYPE_ACCESS_ALLOWED,
3795 GENERIC_ALL_ACCESS,
3796 0);
3797 psd->dacl = make_sec_acl(talloc_tos(),
3798 NT4_ACL_REVISION,
3799 3,
3800 ace);
3801 if (psd->dacl == NULL) {
3802 return NT_STATUS_NO_MEMORY;
3803 }
3804 security_acl_map_generic(psd->dacl, &file_generic_mapping);
3805 }
3806
3807 acl_perms = unpack_canon_ace(fsp, &fsp->fsp_name->st, &file_owner_sid,
3808 &file_grp_sid, &file_ace_list,
3809 &dir_ace_list, security_info_sent, psd);
3810
3811 /* Ignore W2K traverse DACL set. */
3812 if (!file_ace_list && !dir_ace_list) {
3813 return NT_STATUS_OK;
3814 }
3815
3816 if (!acl_perms) {
3817 DEBUG(3,("set_nt_acl: cannot set permissions\n"));
3818 free_canon_ace_list(file_ace_list);
3819 free_canon_ace_list(dir_ace_list);
3820 return NT_STATUS_ACCESS_DENIED;
3821 }
3822
3823 /*
3824 * Only change security if we got a DACL.
3825 */
3826
3827 if(!(security_info_sent & SECINFO_DACL) || (psd->dacl == NULL)) {
3828 free_canon_ace_list(file_ace_list);
3829 free_canon_ace_list(dir_ace_list);
3830 return NT_STATUS_OK;
3831 }
3832
3833 /*
3834 * Try using the POSIX ACL set first. Fall back to chmod if
3835 * we have no ACL support on this filesystem.
3836 */
3837
3838 if (acl_perms && file_ace_list) {
3839 if (set_acl_as_root) {
3840 become_root();
3841 }
3842 ret = set_canon_ace_list(fsp, file_ace_list, false,
3843 &fsp->fsp_name->st, &acl_set_support);
3844 if (set_acl_as_root) {
3845 unbecome_root();
3846 }
3847 if (acl_set_support && ret == false) {
3848 DEBUG(3,("set_nt_acl: failed to set file acl on file "
3849 "%s (%s).\n", fsp_str_dbg(fsp),
3850 strerror(errno)));
3851 free_canon_ace_list(file_ace_list);
3852 free_canon_ace_list(dir_ace_list);
3853 return map_nt_error_from_unix(errno);
3854 }
3855 }
3856
3857 if (acl_perms && acl_set_support && fsp->is_directory) {
3858 if (dir_ace_list) {
3859 if (set_acl_as_root) {
3860 become_root();
3861 }
3862 ret = set_canon_ace_list(fsp, dir_ace_list, true,
3863 &fsp->fsp_name->st,
3864 &acl_set_support);
3865 if (set_acl_as_root) {
3866 unbecome_root();
3867 }
3868 if (ret == false) {
3869 DEBUG(3,("set_nt_acl: failed to set default "
3870 "acl on directory %s (%s).\n",
3871 fsp_str_dbg(fsp), strerror(errno)));
3872 free_canon_ace_list(file_ace_list);
3873 free_canon_ace_list(dir_ace_list);
3874 return map_nt_error_from_unix(errno);
3875 }
3876 } else {
3877 int sret = -1;
3878
3879 /*
3880 * No default ACL - delete one if it exists.
3881 */
3882
3883 if (set_acl_as_root) {
3884 become_root();
3885 }
3886 sret = SMB_VFS_SYS_ACL_DELETE_DEF_FILE(conn,
3887 fsp->fsp_name);
3888 if (set_acl_as_root) {
3889 unbecome_root();
3890 }
3891 if (sret == -1) {
3892 if (acl_group_override(conn, fsp->fsp_name)) {
3893 DEBUG(5,("set_nt_acl: acl group "
3894 "control on and current user "
3895 "in file %s primary group. "
3896 "Override delete_def_acl\n",
3897 fsp_str_dbg(fsp)));
3898
3899 become_root();
3900 sret =
3901 SMB_VFS_SYS_ACL_DELETE_DEF_FILE(
3902 conn,
3903 fsp->fsp_name);
3904 unbecome_root();
3905 }
3906
3907 if (sret == -1) {
3908 DEBUG(3,("set_nt_acl: sys_acl_delete_def_file failed (%s)\n", strerror(errno)));
3909 free_canon_ace_list(file_ace_list);
3910 free_canon_ace_list(dir_ace_list);
3911 return map_nt_error_from_unix(errno);
3912 }
3913 }
3914 }
3915 }
3916
3917 if (acl_set_support) {
3918 if (set_acl_as_root) {
3919 become_root();
3920 }
3921 store_inheritance_attributes(fsp,
3922 file_ace_list,
3923 dir_ace_list,
3924 psd->type);
3925 if (set_acl_as_root) {
3926 unbecome_root();
3927 }
3928 }
3929
3930 /*
3931 * If we cannot set using POSIX ACLs we fall back to checking if we need to chmod.
3932 */
3933
3934 if(!acl_set_support && acl_perms) {
3935 mode_t posix_perms;
3936
3937 if (!convert_canon_ace_to_posix_perms( fsp, file_ace_list, &posix_perms)) {
3938 free_canon_ace_list(file_ace_list);
3939 free_canon_ace_list(dir_ace_list);
3940 DEBUG(3,("set_nt_acl: failed to convert file acl to "
3941 "posix permissions for file %s.\n",
3942 fsp_str_dbg(fsp)));
3943 return NT_STATUS_ACCESS_DENIED;
3944 }
3945
3946 if (orig_mode != posix_perms) {
3947 int sret = -1;
3948
3949 DEBUG(3,("set_nt_acl: chmod %s. perms = 0%o.\n",
3950 fsp_str_dbg(fsp), (unsigned int)posix_perms));
3951
3952 if (set_acl_as_root) {
3953 become_root();
3954 }
3955 sret = SMB_VFS_CHMOD(conn, fsp->fsp_name,
3956 posix_perms);
3957 if (set_acl_as_root) {
3958 unbecome_root();
3959 }
3960 if(sret == -1) {
3961 if (acl_group_override(conn, fsp->fsp_name)) {
3962 DEBUG(5,("set_nt_acl: acl group "
3963 "control on and current user "
3964 "in file %s primary group. "
3965 "Override chmod\n",
3966 fsp_str_dbg(fsp)));
3967
3968 become_root();
3969 sret = SMB_VFS_CHMOD(conn,
3970 fsp->fsp_name,
3971 posix_perms);
3972 unbecome_root();
3973 }
3974
3975 if (sret == -1) {
3976 DEBUG(3,("set_nt_acl: chmod %s, 0%o "
3977 "failed. Error = %s.\n",
3978 fsp_str_dbg(fsp),
3979 (unsigned int)posix_perms,
3980 strerror(errno)));
3981 free_canon_ace_list(file_ace_list);
3982 free_canon_ace_list(dir_ace_list);
3983 return map_nt_error_from_unix(errno);
3984 }
3985 }
3986 }
3987 }
3988
3989 free_canon_ace_list(file_ace_list);
3990 free_canon_ace_list(dir_ace_list);
3991
3992 /* Ensure the stat struct in the fsp is correct. */
3993 status = vfs_stat_fsp(fsp);
3994
3995 return NT_STATUS_OK;
3996 }
3997
3998 /****************************************************************************
3999 Get the actual group bits stored on a file with an ACL. Has no effect if
4000 the file has no ACL. Needed in dosmode code where the stat() will return
4001 the mask bits, not the real group bits, for a file with an ACL.
4002 ****************************************************************************/
4003
4004 int get_acl_group_bits( connection_struct *conn,
4005 const struct smb_filename *smb_fname,
4006 mode_t *mode )
4007 {
4008 int entry_id = SMB_ACL_FIRST_ENTRY;
4009 SMB_ACL_ENTRY_T entry;
4010 SMB_ACL_T posix_acl;
4011 int result = -1;
4012
4013 posix_acl = SMB_VFS_SYS_ACL_GET_FILE(conn, smb_fname,
4014 SMB_ACL_TYPE_ACCESS, talloc_tos());
4015 if (posix_acl == (SMB_ACL_T)NULL)
4016 return -1;
4017
4018 while (sys_acl_get_entry(posix_acl, entry_id, &entry) == 1) {
4019 SMB_ACL_TAG_T tagtype;
4020 SMB_ACL_PERMSET_T permset;
4021
4022 entry_id = SMB_ACL_NEXT_ENTRY;
4023
4024 if (sys_acl_get_tag_type(entry, &tagtype) ==-1)
4025 break;
4026
4027 if (tagtype == SMB_ACL_GROUP_OBJ) {
4028 if (sys_acl_get_permset(entry, &permset) == -1) {
4029 break;
4030 } else {
4031 *mode &= ~(S_IRGRP|S_IWGRP|S_IXGRP);
4032 *mode |= (sys_acl_get_perm(permset, SMB_ACL_READ) ? S_IRGRP : 0);
4033 *mode |= (sys_acl_get_perm(permset, SMB_ACL_WRITE) ? S_IWGRP : 0);
4034 *mode |= (sys_acl_get_perm(permset, SMB_ACL_EXECUTE) ? S_IXGRP : 0);
4035 result = 0;
4036 break;
4037 }
4038 }
4039 }
4040 TALLOC_FREE(posix_acl);
4041 return result;
4042 }
4043
4044 /****************************************************************************
4045 Do a chmod by setting the ACL USER_OBJ, GROUP_OBJ and OTHER bits in an ACL
4046 and set the mask to rwx. Needed to preserve complex ACLs set by NT.
4047 ****************************************************************************/
4048
4049 static int chmod_acl_internals( connection_struct *conn, SMB_ACL_T posix_acl, mode_t mode)
4050 {
4051 int entry_id = SMB_ACL_FIRST_ENTRY;
4052 SMB_ACL_ENTRY_T entry;
4053 int num_entries = 0;
4054
4055 while ( sys_acl_get_entry(posix_acl, entry_id, &entry) == 1) {
4056 SMB_ACL_TAG_T tagtype;
4057 SMB_ACL_PERMSET_T permset;
4058 mode_t perms;
4059
4060 entry_id = SMB_ACL_NEXT_ENTRY;
4061
4062 if (sys_acl_get_tag_type(entry, &tagtype) == -1)
4063 return -1;
4064
4065 if (sys_acl_get_permset(entry, &permset) == -1)
4066 return -1;
4067
4068 num_entries++;
4069
4070 switch(tagtype) {
4071 case SMB_ACL_USER_OBJ:
4072 perms = unix_perms_to_acl_perms(mode, S_IRUSR, S_IWUSR, S_IXUSR);
4073 break;
4074 case SMB_ACL_GROUP_OBJ:
4075 perms = unix_perms_to_acl_perms(mode, S_IRGRP, S_IWGRP, S_IXGRP);
4076 break;
4077 case SMB_ACL_MASK:
4078 /*
4079 * FIXME: The ACL_MASK entry permissions should really be set to
4080 * the union of the permissions of all ACL_USER,
4081 * ACL_GROUP_OBJ, and ACL_GROUP entries. That's what
4082 * acl_calc_mask() does, but Samba ACLs doesn't provide it.
4083 */
4084 perms = S_IRUSR|S_IWUSR|S_IXUSR;
4085 break;
4086 case SMB_ACL_OTHER:
4087 perms = unix_perms_to_acl_perms(mode, S_IROTH, S_IWOTH, S_IXOTH);
4088 break;
4089 default:
4090 continue;
4091 }
4092
4093 if (map_acl_perms_to_permset(perms, &permset) == -1)
4094 return -1;
4095
4096 if (sys_acl_set_permset(entry, permset) == -1)
4097 return -1;
4098 }
4099
4100 /*
4101 * If this is a simple 3 element ACL or no elements then it's a standard
4102 * UNIX permission set. Just use chmod...
4103 */
4104
4105 if ((num_entries == 3) || (num_entries == 0))
4106 return -1;
4107
4108 return 0;
4109 }
4110
4111 /****************************************************************************
4112 Get the access ACL of FROM, do a chmod by setting the ACL USER_OBJ,
4113 GROUP_OBJ and OTHER bits in an ACL and set the mask to rwx. Set the
4114 resulting ACL on TO. Note that name is in UNIX character set.
4115 ****************************************************************************/
4116
4117 static int copy_access_posix_acl(connection_struct *conn,
4118 const struct smb_filename *smb_fname_from,
4119 const struct smb_filename *smb_fname_to,
4120 mode_t mode)
4121 {
4122 SMB_ACL_T posix_acl = NULL;
4123 int ret = -1;
4124
4125 if ((posix_acl = SMB_VFS_SYS_ACL_GET_FILE(conn, smb_fname_from,
4126 SMB_ACL_TYPE_ACCESS,
4127 talloc_tos())) == NULL)
4128 return -1;
4129
4130 if ((ret = chmod_acl_internals(conn, posix_acl, mode)) == -1)
4131 goto done;
4132
4133 ret = SMB_VFS_SYS_ACL_SET_FILE(conn, smb_fname_to,
4134 SMB_ACL_TYPE_ACCESS, posix_acl);
4135
4136 done:
4137
4138 TALLOC_FREE(posix_acl);
4139 return ret;
4140 }
4141
4142 /****************************************************************************
4143 Check for an existing default POSIX ACL on a directory.
4144 ****************************************************************************/
4145
4146 static bool directory_has_default_posix_acl(connection_struct *conn,
4147 const struct smb_filename *smb_fname)
4148 {
4149 SMB_ACL_T def_acl = SMB_VFS_SYS_ACL_GET_FILE(conn, smb_fname,
4150 SMB_ACL_TYPE_DEFAULT,
4151 talloc_tos());
4152 bool has_acl = False;
4153 SMB_ACL_ENTRY_T entry;
4154
4155 if (def_acl != NULL && (sys_acl_get_entry(def_acl, SMB_ACL_FIRST_ENTRY, &entry) == 1)) {
4156 has_acl = True;
4157 }
4158
4159 if (def_acl) {
4160 TALLOC_FREE(def_acl);
4161 }
4162 return has_acl;
4163 }
4164
4165 /****************************************************************************
4166 If the parent directory has no default ACL but it does have an Access ACL,
4167 inherit this Access ACL to file name.
4168 ****************************************************************************/
4169
4170 int inherit_access_posix_acl(connection_struct *conn,
4171 const char *inherit_from_dir,
4172 const struct smb_filename *smb_fname,
4173 mode_t mode)
4174 {
4175 struct smb_filename *inherit_from_fname =
4176 synthetic_smb_fname(talloc_tos(),
4177 smb_fname->base_name,
4178 NULL,
4179 NULL,
4180 smb_fname->flags);
4181 if (inherit_from_fname == NULL) {
4182 return-1;
4183 }
4184
4185 if (directory_has_default_posix_acl(conn, inherit_from_fname))
4186 return 0;
4187
4188 return copy_access_posix_acl(conn, inherit_from_fname, smb_fname, mode);
4189 }
4190
4191 /****************************************************************************
4192 Map from wire type to permset.
4193 ****************************************************************************/
4194
4195 static bool unix_ex_wire_to_permset(connection_struct *conn, unsigned char wire_perm, SMB_ACL_PERMSET_T *p_permset)
4196 {
4197 if (wire_perm & ~(SMB_POSIX_ACL_READ|SMB_POSIX_ACL_WRITE|SMB_POSIX_ACL_EXECUTE)) {
4198 return False;
4199 }
4200
4201 if (sys_acl_clear_perms(*p_permset) == -1) {
4202 return False;
4203 }
4204
4205 if (wire_perm & SMB_POSIX_ACL_READ) {
4206 if (sys_acl_add_perm(*p_permset, SMB_ACL_READ) == -1) {
4207 return False;
4208 }
4209 }
4210 if (wire_perm & SMB_POSIX_ACL_WRITE) {
4211 if (sys_acl_add_perm(*p_permset, SMB_ACL_WRITE) == -1) {
4212 return False;
4213 }
4214 }
4215 if (wire_perm & SMB_POSIX_ACL_EXECUTE) {
4216 if (sys_acl_add_perm(*p_permset, SMB_ACL_EXECUTE) == -1) {
4217 return False;
4218 }
4219 }
4220 return True;
4221 }
4222
4223 /****************************************************************************
4224 Map from wire type to tagtype.
4225 ****************************************************************************/
4226
4227 static bool unix_ex_wire_to_tagtype(unsigned char wire_tt, SMB_ACL_TAG_T *p_tt)
4228 {
4229 switch (wire_tt) {
4230 case SMB_POSIX_ACL_USER_OBJ:
4231 *p_tt = SMB_ACL_USER_OBJ;
4232 break;
4233 case SMB_POSIX_ACL_USER:
4234 *p_tt = SMB_ACL_USER;
4235 break;
4236 case SMB_POSIX_ACL_GROUP_OBJ:
4237 *p_tt = SMB_ACL_GROUP_OBJ;
4238 break;
4239 case SMB_POSIX_ACL_GROUP:
4240 *p_tt = SMB_ACL_GROUP;
4241 break;
4242 case SMB_POSIX_ACL_MASK:
4243 *p_tt = SMB_ACL_MASK;
4244 break;
4245 case SMB_POSIX_ACL_OTHER:
4246 *p_tt = SMB_ACL_OTHER;
4247 break;
4248 default:
4249 return False;
4250 }
4251 return True;
4252 }
4253
4254 /****************************************************************************
4255 Create a new POSIX acl from wire permissions.
4256 FIXME ! How does the share mask/mode fit into this.... ?
4257 ****************************************************************************/
4258
4259 static SMB_ACL_T create_posix_acl_from_wire(connection_struct *conn,
4260 uint16_t num_acls,
4261 const char *pdata,
4262 TALLOC_CTX *mem_ctx)
4263 {
4264 unsigned int i;
4265 SMB_ACL_T the_acl = sys_acl_init(mem_ctx);
4266
4267 if (the_acl == NULL) {
4268 return NULL;
4269 }
4270
4271 for (i = 0; i < num_acls; i++) {
4272 SMB_ACL_ENTRY_T the_entry;
4273 SMB_ACL_PERMSET_T the_permset;
4274 SMB_ACL_TAG_T tag_type;
4275
4276 if (sys_acl_create_entry(&the_acl, &the_entry) == -1) {
4277 DEBUG(0,("create_posix_acl_from_wire: Failed to create entry %u. (%s)\n",
4278 i, strerror(errno) ));
4279 goto fail;
4280 }
4281
4282 if (!unix_ex_wire_to_tagtype(CVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)), &tag_type)) {
4283 DEBUG(0,("create_posix_acl_from_wire: invalid wire tagtype %u on entry %u.\n",
4284 CVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)), i ));
4285 goto fail;
4286 }
4287
4288 if (sys_acl_set_tag_type(the_entry, tag_type) == -1) {
4289 DEBUG(0,("create_posix_acl_from_wire: Failed to set tagtype on entry %u. (%s)\n",
4290 i, strerror(errno) ));
4291 goto fail;
4292 }
4293
4294 /* Get the permset pointer from the new ACL entry. */
4295 if (sys_acl_get_permset(the_entry, &the_permset) == -1) {
4296 DEBUG(0,("create_posix_acl_from_wire: Failed to get permset on entry %u. (%s)\n",
4297 i, strerror(errno) ));
4298 goto fail;
4299 }
4300
4301 /* Map from wire to permissions. */
4302 if (!unix_ex_wire_to_permset(conn, CVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)+1), &the_permset)) {
4303 DEBUG(0,("create_posix_acl_from_wire: invalid permset %u on entry %u.\n",
4304 CVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE) + 1), i ));
4305 goto fail;
4306 }
4307
4308 /* Now apply to the new ACL entry. */
4309 if (sys_acl_set_permset(the_entry, the_permset) == -1) {
4310 DEBUG(0,("create_posix_acl_from_wire: Failed to add permset on entry %u. (%s)\n",
4311 i, strerror(errno) ));
4312 goto fail;
4313 }
4314
4315 if (tag_type == SMB_ACL_USER) {
4316 uint32_t uidval = IVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)+2);
4317 uid_t uid = (uid_t)uidval;
4318 if (sys_acl_set_qualifier(the_entry,(void *)&uid) == -1) {
4319 DEBUG(0,("create_posix_acl_from_wire: Failed to set uid %u on entry %u. (%s)\n",
4320 (unsigned int)uid, i, strerror(errno) ));
4321 goto fail;
4322 }
4323 }
4324
4325 if (tag_type == SMB_ACL_GROUP) {
4326 uint32_t gidval = IVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)+2);
4327 gid_t gid = (uid_t)gidval;
4328 if (sys_acl_set_qualifier(the_entry,(void *)&gid) == -1) {
4329 DEBUG(0,("create_posix_acl_from_wire: Failed to set gid %u on entry %u. (%s)\n",
4330 (unsigned int)gid, i, strerror(errno) ));
4331 goto fail;
4332 }
4333 }
4334 }
4335
4336 return the_acl;
4337
4338 fail:
4339
4340 if (the_acl != NULL) {
4341 TALLOC_FREE(the_acl);
4342 }
4343 return NULL;
4344 }
4345
4346 /****************************************************************************
4347 Calls from UNIX extensions - Default POSIX ACL set.
4348 If num_def_acls == 0 and not a directory just return. If it is a directory
4349 and num_def_acls == 0 then remove the default acl. Else set the default acl
4350 on the directory.
4351 ****************************************************************************/
4352
4353 bool set_unix_posix_default_acl(connection_struct *conn,
4354 const struct smb_filename *smb_fname,
4355 uint16_t num_def_acls,
4356 const char *pdata)
4357 {
4358 SMB_ACL_T def_acl = NULL;
4359
4360 if (!S_ISDIR(smb_fname->st.st_ex_mode)) {
4361 if (num_def_acls) {
4362 DEBUG(5,("set_unix_posix_default_acl: Can't "
4363 "set default ACL on non-directory file %s\n",
4364 smb_fname->base_name ));
4365 errno = EISDIR;
4366 return False;
4367 } else {
4368 return True;
4369 }
4370 }
4371
4372 if (!num_def_acls) {
4373 /* Remove the default ACL. */
4374 if (SMB_VFS_SYS_ACL_DELETE_DEF_FILE(conn, smb_fname) == -1) {
4375 DEBUG(5,("set_unix_posix_default_acl: acl_delete_def_file failed on directory %s (%s)\n",
4376 smb_fname->base_name, strerror(errno) ));
4377 return False;
4378 }
4379 return True;
4380 }
4381
4382 if ((def_acl = create_posix_acl_from_wire(conn, num_def_acls,
4383 pdata,
4384 talloc_tos())) == NULL) {
4385 return False;
4386 }
4387
4388 if (SMB_VFS_SYS_ACL_SET_FILE(conn, smb_fname,
4389 SMB_ACL_TYPE_DEFAULT, def_acl) == -1) {
4390 DEBUG(5,("set_unix_posix_default_acl: acl_set_file failed on directory %s (%s)\n",
4391 smb_fname->base_name, strerror(errno) ));
4392 TALLOC_FREE(def_acl);
4393 return False;
4394 }
4395
4396 DEBUG(10,("set_unix_posix_default_acl: set default acl for file %s\n",
4397 smb_fname->base_name ));
4398 TALLOC_FREE(def_acl);
4399 return True;
4400 }
4401
4402 /****************************************************************************
4403 Remove an ACL from a file. As we don't have acl_delete_entry() available
4404 we must read the current acl and copy all entries except MASK, USER and GROUP
4405 to a new acl, then set that. This (at least on Linux) causes any ACL to be
4406 removed.
4407 FIXME ! How does the share mask/mode fit into this.... ?
4408 ****************************************************************************/
4409
4410 static bool remove_posix_acl(connection_struct *conn,
4411 files_struct *fsp,
4412 const struct smb_filename *smb_fname)
4413 {
4414 SMB_ACL_T file_acl = NULL;
4415 int entry_id = SMB_ACL_FIRST_ENTRY;
4416 SMB_ACL_ENTRY_T entry;
4417 bool ret = False;
4418 const char *fname = smb_fname->base_name;
4419 /* Create a new ACL with only 3 entries, u/g/w. */
4420 SMB_ACL_T new_file_acl = sys_acl_init(talloc_tos());
4421 SMB_ACL_ENTRY_T user_ent = NULL;
4422 SMB_ACL_ENTRY_T group_ent = NULL;
4423 SMB_ACL_ENTRY_T other_ent = NULL;
4424
4425 if (new_file_acl == NULL) {
4426 DEBUG(5,("remove_posix_acl: failed to init new ACL with 3 entries for file %s.\n", fname));
4427 return False;
4428 }
4429
4430 /* Now create the u/g/w entries. */
4431 if (sys_acl_create_entry(&new_file_acl, &user_ent) == -1) {
4432 DEBUG(5,("remove_posix_acl: Failed to create user entry for file %s. (%s)\n",
4433 fname, strerror(errno) ));
4434 goto done;
4435 }
4436 if (sys_acl_set_tag_type(user_ent, SMB_ACL_USER_OBJ) == -1) {
4437 DEBUG(5,("remove_posix_acl: Failed to set user entry for file %s. (%s)\n",
4438 fname, strerror(errno) ));
4439 goto done;
4440 }
4441
4442 if (sys_acl_create_entry(&new_file_acl, &group_ent) == -1) {
4443 DEBUG(5,("remove_posix_acl: Failed to create group entry for file %s. (%s)\n",
4444 fname, strerror(errno) ));
4445 goto done;
4446 }
4447 if (sys_acl_set_tag_type(group_ent, SMB_ACL_GROUP_OBJ) == -1) {
4448 DEBUG(5,("remove_posix_acl: Failed to set group entry for file %s. (%s)\n",
4449 fname, strerror(errno) ));
4450 goto done;
4451 }
4452
4453 if (sys_acl_create_entry(&new_file_acl, &other_ent) == -1) {
4454 DEBUG(5,("remove_posix_acl: Failed to create other entry for file %s. (%s)\n",
4455 fname, strerror(errno) ));
4456 goto done;
4457 }
4458 if (sys_acl_set_tag_type(other_ent, SMB_ACL_OTHER) == -1) {
4459 DEBUG(5,("remove_posix_acl: Failed to set other entry for file %s. (%s)\n",
4460 fname, strerror(errno) ));
4461 goto done;
4462 }
4463
4464 /* Get the current file ACL. */
4465 if (fsp && fsp->fh->fd != -1) {
4466 file_acl = SMB_VFS_SYS_ACL_GET_FD(fsp, talloc_tos());
4467 } else {
4468 file_acl = SMB_VFS_SYS_ACL_GET_FILE(conn, smb_fname,
4469 SMB_ACL_TYPE_ACCESS,
4470 talloc_tos());
4471 }
4472
4473 if (file_acl == NULL) {
4474 /* This is only returned if an error occurred. Even for a file with
4475 no acl a u/g/w acl should be returned. */
4476 DEBUG(5,("remove_posix_acl: failed to get ACL from file %s (%s).\n",
4477 fname, strerror(errno) ));
4478 goto done;
4479 }
4480
4481 while ( sys_acl_get_entry(file_acl, entry_id, &entry) == 1) {
4482 SMB_ACL_TAG_T tagtype;
4483 SMB_ACL_PERMSET_T permset;
4484
4485 entry_id = SMB_ACL_NEXT_ENTRY;
4486
4487 if (sys_acl_get_tag_type(entry, &tagtype) == -1) {
4488 DEBUG(5,("remove_posix_acl: failed to get tagtype from ACL on file %s (%s).\n",
4489 fname, strerror(errno) ));
4490 goto done;
4491 }
4492
4493 if (sys_acl_get_permset(entry, &permset) == -1) {
4494 DEBUG(5,("remove_posix_acl: failed to get permset from ACL on file %s (%s).\n",
4495 fname, strerror(errno) ));
4496 goto done;
4497 }
4498
4499 if (tagtype == SMB_ACL_USER_OBJ) {
4500 if (sys_acl_set_permset(user_ent, permset) == -1) {
4501 DEBUG(5,("remove_posix_acl: failed to set permset from ACL on file %s (%s).\n",
4502 fname, strerror(errno) ));
4503 }
4504 } else if (tagtype == SMB_ACL_GROUP_OBJ) {
4505 if (sys_acl_set_permset(group_ent, permset) == -1) {
4506 DEBUG(5,("remove_posix_acl: failed to set permset from ACL on file %s (%s).\n",
4507 fname, strerror(errno) ));
4508 }
4509 } else if (tagtype == SMB_ACL_OTHER) {
4510 if (sys_acl_set_permset(other_ent, permset) == -1) {
4511 DEBUG(5,("remove_posix_acl: failed to set permset from ACL on file %s (%s).\n",
4512 fname, strerror(errno) ));
4513 }
4514 }
4515 }
4516
4517 /* Set the new empty file ACL. */
4518 if (fsp && fsp->fh->fd != -1) {
4519 if (SMB_VFS_SYS_ACL_SET_FD(fsp, new_file_acl) == -1) {
4520 DEBUG(5,("remove_posix_acl: acl_set_file failed on %s (%s)\n",
4521 fname, strerror(errno) ));
4522 goto done;
4523 }
4524 } else {
4525 if (SMB_VFS_SYS_ACL_SET_FILE(conn,
4526 smb_fname,
4527 SMB_ACL_TYPE_ACCESS,
4528 new_file_acl) == -1) {
4529 DEBUG(5,("remove_posix_acl: acl_set_file failed on %s (%s)\n",
4530 fname, strerror(errno) ));
4531 goto done;
4532 }
4533 }
4534
4535 ret = True;
4536
4537 done:
4538
4539 if (file_acl) {
4540 TALLOC_FREE(file_acl);
4541 }
4542 if (new_file_acl) {
4543 TALLOC_FREE(new_file_acl);
4544 }
4545 return ret;
4546 }
4547
4548 /****************************************************************************
4549 Calls from UNIX extensions - POSIX ACL set.
4550 If num_def_acls == 0 then read/modify/write acl after removing all entries
4551 except SMB_ACL_USER_OBJ, SMB_ACL_GROUP_OBJ, SMB_ACL_OTHER.
4552 ****************************************************************************/
4553
4554 bool set_unix_posix_acl(connection_struct *conn, files_struct *fsp,
4555 const struct smb_filename *smb_fname,
4556 uint16_t num_acls,
4557 const char *pdata)
4558 {
4559 SMB_ACL_T file_acl = NULL;
4560 const char *fname = smb_fname->base_name;
4561
4562 if (!num_acls) {
4563 /* Remove the ACL from the file. */
4564 return remove_posix_acl(conn, fsp, smb_fname);
4565 }
4566
4567 if ((file_acl = create_posix_acl_from_wire(conn, num_acls,
4568 pdata,
4569 talloc_tos())) == NULL) {
4570 return False;
4571 }
4572
4573 if (fsp && fsp->fh->fd != -1) {
4574 /* The preferred way - use an open fd. */
4575 if (SMB_VFS_SYS_ACL_SET_FD(fsp, file_acl) == -1) {
4576 DEBUG(5,("set_unix_posix_acl: acl_set_file failed on %s (%s)\n",
4577 fname, strerror(errno) ));
4578 TALLOC_FREE(file_acl);
4579 return False;
4580 }
4581 } else {
4582 if (SMB_VFS_SYS_ACL_SET_FILE(conn, smb_fname,
4583 SMB_ACL_TYPE_ACCESS, file_acl) == -1) {
4584 DEBUG(5,("set_unix_posix_acl: acl_set_file failed on %s (%s)\n",
4585 fname, strerror(errno) ));
4586 TALLOC_FREE(file_acl);
4587 return False;
4588 }
4589 }
4590
4591 DEBUG(10,("set_unix_posix_acl: set acl for file %s\n", fname ));
4592 TALLOC_FREE(file_acl);
4593 return True;
4594 }
4595
4596 /********************************************************************
4597 Pull the NT ACL from a file on disk or the OpenEventlog() access
4598 check. Caller is responsible for freeing the returned security
4599 descriptor via TALLOC_FREE(). This is designed for dealing with
4600 user space access checks in smbd outside of the VFS. For example,
4601 checking access rights in OpenEventlog() or from python.
4602
4603 ********************************************************************/
4604
4605 NTSTATUS get_nt_acl_no_snum(TALLOC_CTX *ctx, const char *fname,
4606 uint32_t security_info_wanted,
4607 struct security_descriptor **sd)
4608 {
4609 TALLOC_CTX *frame = talloc_stackframe();
4610 struct conn_struct_tos *c = NULL;
4611 NTSTATUS status = NT_STATUS_OK;
4612 struct smb_filename *smb_fname = synthetic_smb_fname(talloc_tos(),
4613 fname,
4614 NULL,
4615 NULL,
4616 0);
4617
4618 if (smb_fname == NULL) {
4619 TALLOC_FREE(frame);
4620 return NT_STATUS_NO_MEMORY;
4621 }
4622
4623 if (!posix_locking_init(false)) {
4624 TALLOC_FREE(frame);
4625 return NT_STATUS_NO_MEMORY;
4626 }
4627
4628 status = create_conn_struct_tos(global_messaging_context(),
4629 -1,
4630 "/",
4631 NULL,
4632 &c);
4633 if (!NT_STATUS_IS_OK(status)) {
4634 DEBUG(0,("create_conn_struct returned %s.\n",
4635 nt_errstr(status)));
4636 TALLOC_FREE(frame);
4637 return status;
4638 }
4639
4640 status = SMB_VFS_GET_NT_ACL(c->conn,
4641 smb_fname,
4642 security_info_wanted,
4643 ctx,
4644 sd);
4645 if (!NT_STATUS_IS_OK(status)) {
4646 DEBUG(0, ("get_nt_acl_no_snum: SMB_VFS_GET_NT_ACL returned %s.\n",
4647 nt_errstr(status)));
4648 }
4649
4650 TALLOC_FREE(frame);
4651
4652 return status;
4653 }
4654
4655 int posix_sys_acl_blob_get_file(vfs_handle_struct *handle,
4656 const struct smb_filename *smb_fname_in,
4657 TALLOC_CTX *mem_ctx,
4658 char **blob_description,
4659 DATA_BLOB *blob)
4660 {
4661 int ret;
4662 TALLOC_CTX *frame = talloc_stackframe();
4663 /* Initialise this to zero, in a portable way */
4664 struct smb_acl_wrapper acl_wrapper = {
4665 NULL
4666 };
4667 struct smb_filename *smb_fname = cp_smb_filename_nostream(frame,
4668 smb_fname_in);
4669 if (smb_fname == NULL) {
4670 TALLOC_FREE(frame);
4671 errno = ENOMEM;
4672 return -1;
4673 }
4674
4675 acl_wrapper.access_acl
4676 = smb_vfs_call_sys_acl_get_file(handle,
4677 smb_fname,
4678 SMB_ACL_TYPE_ACCESS,
4679 frame);
4680
4681 ret = smb_vfs_call_stat(handle, smb_fname);
4682 if (ret == -1) {
4683 TALLOC_FREE(frame);
4684 return -1;
4685 }
4686
4687 if (S_ISDIR(smb_fname->st.st_ex_mode)) {
4688 acl_wrapper.default_acl
4689 = smb_vfs_call_sys_acl_get_file(handle,
4690 smb_fname,
4691 SMB_ACL_TYPE_DEFAULT,
4692 frame);
4693 }
4694
4695 acl_wrapper.owner = smb_fname->st.st_ex_uid;
4696 acl_wrapper.group = smb_fname->st.st_ex_gid;
4697 acl_wrapper.mode = smb_fname->st.st_ex_mode;
4698
4699 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_push_struct_blob(blob, mem_ctx,
4700 &acl_wrapper,
4701 (ndr_push_flags_fn_t)ndr_push_smb_acl_wrapper))) {
4702 errno = EINVAL;
4703 TALLOC_FREE(frame);
4704 return -1;
4705 }
4706
4707 *blob_description = talloc_strdup(mem_ctx, "posix_acl");
4708 if (!*blob_description) {
4709 errno = EINVAL;
4710 TALLOC_FREE(frame);
4711 return -1;
4712 }
4713
4714 TALLOC_FREE(frame);
4715 return 0;
4716 }
4717
4718 int posix_sys_acl_blob_get_fd(vfs_handle_struct *handle,
4719 files_struct *fsp,
4720 TALLOC_CTX *mem_ctx,
4721 char **blob_description,
4722 DATA_BLOB *blob)
4723 {
4724 SMB_STRUCT_STAT sbuf;
4725 TALLOC_CTX *frame;
4726 struct smb_acl_wrapper acl_wrapper;
4727 int ret;
4728
4729 /* This ensures that we also consider the default ACL */
4730 if (fsp->is_directory || fsp->fh->fd == -1) {
4731 return posix_sys_acl_blob_get_file(handle,
4732 fsp->fsp_name,
4733 mem_ctx,
4734 blob_description,
4735 blob);
4736 }
4737 frame = talloc_stackframe();
4738
4739 acl_wrapper.default_acl = NULL;
4740
4741 acl_wrapper.access_acl = smb_vfs_call_sys_acl_get_file(handle,
4742 fsp->fsp_name,
4743 SMB_ACL_TYPE_ACCESS,
4744 frame);
4745
4746 ret = smb_vfs_call_fstat(handle, fsp, &sbuf);
4747 if (ret == -1) {
4748 TALLOC_FREE(frame);
4749 return -1;
4750 }
4751
4752 acl_wrapper.owner = sbuf.st_ex_uid;
4753 acl_wrapper.group = sbuf.st_ex_gid;
4754 acl_wrapper.mode = sbuf.st_ex_mode;
4755
4756 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_push_struct_blob(blob, mem_ctx,
4757 &acl_wrapper,
4758 (ndr_push_flags_fn_t)ndr_push_smb_acl_wrapper))) {
4759 errno = EINVAL;
4760 TALLOC_FREE(frame);
4761 return -1;
4762 }
4763
4764 *blob_description = talloc_strdup(mem_ctx, "posix_acl");
4765 if (!*blob_description) {
4766 errno = EINVAL;
4767 TALLOC_FREE(frame);
4768 return -1;
4769 }
4770
4771 TALLOC_FREE(frame);
4772 return 0;
4773 }
4774
4775 static NTSTATUS make_default_acl_posix(TALLOC_CTX *ctx,
4776 const char *name,
4777 const SMB_STRUCT_STAT *psbuf,
4778 struct security_descriptor **ppdesc)
4779 {
4780 struct dom_sid owner_sid, group_sid;
4781 size_t size = 0;
4782 struct security_ace aces[4];
4783 uint32_t access_mask = 0;
4784 mode_t mode = psbuf->st_ex_mode;
4785 struct security_acl *new_dacl = NULL;
4786 int idx = 0;
4787
4788 DBG_DEBUG("file %s mode = 0%o\n",name, (int)mode);
4789
4790 uid_to_sid(&owner_sid, psbuf->st_ex_uid);
4791 gid_to_sid(&group_sid, psbuf->st_ex_gid);
4792
4793 /*
4794 We provide up to 4 ACEs
4795 - Owner
4796 - Group
4797 - Everyone
4798 - NT System
4799 */
4800
4801 if (mode & S_IRUSR) {
4802 if (mode & S_IWUSR) {
4803 access_mask |= SEC_RIGHTS_FILE_ALL;
4804 } else {
4805 access_mask |= SEC_RIGHTS_FILE_READ | SEC_FILE_EXECUTE;
4806 }
4807 }
4808 if (mode & S_IWUSR) {
4809 access_mask |= SEC_RIGHTS_FILE_WRITE | SEC_STD_DELETE;
4810 }
4811
4812 init_sec_ace(&aces[idx],
4813 &owner_sid,
4814 SEC_ACE_TYPE_ACCESS_ALLOWED,
4815 access_mask,
4816 0);
4817 idx++;
4818
4819 access_mask = 0;
4820 if (mode & S_IRGRP) {
4821 access_mask |= SEC_RIGHTS_FILE_READ | SEC_FILE_EXECUTE;
4822 }
4823 if (mode & S_IWGRP) {
4824 /* note that delete is not granted - this matches posix behaviour */
4825 access_mask |= SEC_RIGHTS_FILE_WRITE;
4826 }
4827 if (access_mask) {
4828 init_sec_ace(&aces[idx],
4829 &group_sid,
4830 SEC_ACE_TYPE_ACCESS_ALLOWED,
4831 access_mask,
4832 0);
4833 idx++;
4834 }
4835
4836 access_mask = 0;
4837 if (mode & S_IROTH) {
4838 access_mask |= SEC_RIGHTS_FILE_READ | SEC_FILE_EXECUTE;
4839 }
4840 if (mode & S_IWOTH) {
4841 access_mask |= SEC_RIGHTS_FILE_WRITE;
4842 }
4843 if (access_mask) {
4844 init_sec_ace(&aces[idx],
4845 &global_sid_World,
4846 SEC_ACE_TYPE_ACCESS_ALLOWED,
4847 access_mask,
4848 0);
4849 idx++;
4850 }
4851
4852 init_sec_ace(&aces[idx],
4853 &global_sid_System,
4854 SEC_ACE_TYPE_ACCESS_ALLOWED,
4855 SEC_RIGHTS_FILE_ALL,
4856 0);
4857 idx++;
4858
4859 new_dacl = make_sec_acl(ctx,
4860 NT4_ACL_REVISION,
4861 idx,
4862 aces);
4863
4864 if (!new_dacl) {
4865 return NT_STATUS_NO_MEMORY;
4866 }
4867
4868 *ppdesc = make_sec_desc(ctx,
4869 SECURITY_DESCRIPTOR_REVISION_1,
4870 SEC_DESC_SELF_RELATIVE|SEC_DESC_DACL_PRESENT,
4871 &owner_sid,
4872 &group_sid,
4873 NULL,
4874 new_dacl,
4875 &size);
4876 if (!*ppdesc) {
4877 return NT_STATUS_NO_MEMORY;
4878 }
4879 return NT_STATUS_OK;
4880 }
4881
4882 static NTSTATUS make_default_acl_windows(TALLOC_CTX *ctx,
4883 const char *name,
4884 const SMB_STRUCT_STAT *psbuf,
4885 struct security_descriptor **ppdesc)
4886 {
4887 struct dom_sid owner_sid, group_sid;
4888 size_t size = 0;
4889 struct security_ace aces[4];
4890 uint32_t access_mask = 0;
4891 mode_t mode = psbuf->st_ex_mode;
4892 struct security_acl *new_dacl = NULL;
4893 int idx = 0;
4894
4895 DBG_DEBUG("file [%s] mode [0%o]\n", name, (int)mode);
4896
4897 uid_to_sid(&owner_sid, psbuf->st_ex_uid);
4898 gid_to_sid(&group_sid, psbuf->st_ex_gid);
4899
4900 /*
4901 * We provide 2 ACEs:
4902 * - Owner
4903 * - NT System
4904 */
4905
4906 if (mode & S_IRUSR) {
4907 if (mode & S_IWUSR) {
4908 access_mask |= SEC_RIGHTS_FILE_ALL;
4909 } else {
4910 access_mask |= SEC_RIGHTS_FILE_READ | SEC_FILE_EXECUTE;
4911 }
4912 }
4913 if (mode & S_IWUSR) {
4914 access_mask |= SEC_RIGHTS_FILE_WRITE | SEC_STD_DELETE;
4915 }
4916
4917 init_sec_ace(&aces[idx],
4918 &owner_sid,
4919 SEC_ACE_TYPE_ACCESS_ALLOWED,
4920 access_mask,
4921 0);
4922 idx++;
4923
4924 init_sec_ace(&aces[idx],
4925 &global_sid_System,
4926 SEC_ACE_TYPE_ACCESS_ALLOWED,
4927 SEC_RIGHTS_FILE_ALL,
4928 0);
4929 idx++;
4930
4931 new_dacl = make_sec_acl(ctx,
4932 NT4_ACL_REVISION,
4933 idx,
4934 aces);
4935
4936 if (!new_dacl) {
4937 return NT_STATUS_NO_MEMORY;
4938 }
4939
4940 *ppdesc = make_sec_desc(ctx,
4941 SECURITY_DESCRIPTOR_REVISION_1,
4942 SEC_DESC_SELF_RELATIVE|SEC_DESC_DACL_PRESENT,
4943 &owner_sid,
4944 &group_sid,
4945 NULL,
4946 new_dacl,
4947 &size);
4948 if (!*ppdesc) {
4949 return NT_STATUS_NO_MEMORY;
4950 }
4951 return NT_STATUS_OK;
4952 }
4953
4954 static NTSTATUS make_default_acl_everyone(TALLOC_CTX *ctx,
4955 const char *name,
4956 const SMB_STRUCT_STAT *psbuf,
4957 struct security_descriptor **ppdesc)
4958 {
4959 struct dom_sid owner_sid, group_sid;
4960 size_t size = 0;
4961 struct security_ace aces[1];
4962 mode_t mode = psbuf->st_ex_mode;
4963 struct security_acl *new_dacl = NULL;
4964 int idx = 0;
4965
4966 DBG_DEBUG("file [%s] mode [0%o]\n", name, (int)mode);
4967
4968 uid_to_sid(&owner_sid, psbuf->st_ex_uid);
4969 gid_to_sid(&group_sid, psbuf->st_ex_gid);
4970
4971 /*
4972 * We provide one ACEs: full access for everyone
4973 */
4974
4975 init_sec_ace(&aces[idx],
4976 &global_sid_World,
4977 SEC_ACE_TYPE_ACCESS_ALLOWED,
4978 SEC_RIGHTS_FILE_ALL,
4979 0);
4980 idx++;
4981
4982 new_dacl = make_sec_acl(ctx,
4983 NT4_ACL_REVISION,
4984 idx,
4985 aces);
4986
4987 if (!new_dacl) {
4988 return NT_STATUS_NO_MEMORY;
4989 }
4990
4991 *ppdesc = make_sec_desc(ctx,
4992 SECURITY_DESCRIPTOR_REVISION_1,
4993 SEC_DESC_SELF_RELATIVE|SEC_DESC_DACL_PRESENT,
4994 &owner_sid,
4995 &group_sid,
4996 NULL,
4997 new_dacl,
4998 &size);
4999 if (!*ppdesc) {
5000 return NT_STATUS_NO_MEMORY;
5001 }
5002 return NT_STATUS_OK;
5003 }
5004
5005 static const struct enum_list default_acl_style_list[] = {
5006 {DEFAULT_ACL_POSIX, "posix"},
5007 {DEFAULT_ACL_WINDOWS, "windows"},
5008 {DEFAULT_ACL_EVERYONE, "everyone"},
5009 };
5010
5011 const struct enum_list *get_default_acl_style_list(void)
5012 {
5013 return default_acl_style_list;
5014 }
5015
5016 NTSTATUS make_default_filesystem_acl(
5017 TALLOC_CTX *ctx,
5018 enum default_acl_style acl_style,
5019 const char *name,
5020 const SMB_STRUCT_STAT *psbuf,
5021 struct security_descriptor **ppdesc)
5022 {
5023 NTSTATUS status;
5024
5025 switch (acl_style) {
5026 case DEFAULT_ACL_POSIX:
5027 status = make_default_acl_posix(ctx, name, psbuf, ppdesc);
5028 break;
5029
5030 case DEFAULT_ACL_WINDOWS:
5031 status = make_default_acl_windows(ctx, name, psbuf, ppdesc);
5032 break;
5033
5034 case DEFAULT_ACL_EVERYONE:
5035 status = make_default_acl_everyone(ctx, name, psbuf, ppdesc);
5036 break;
5037
5038 default:
5039 DBG_ERR("unknown acl style %d", acl_style);
5040 status = NT_STATUS_INTERNAL_ERROR;
5041 break;
5042 }
5043
5044 return status;
5045 }
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