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param: Rename variable used for lp_passwd_program szPasswdProgram
[Samba.git] / source3 / smbd / posix_acls.c
blob621457e05109b1361cff652dae7712fdb54829a9
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 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 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->base_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 num_entries;
342 uint16 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 num_entries;
374 uint16 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 int i;
441
442 for (i = 0; i < paiv->num_entries; i++) {
443 struct pai_entry *paie = talloc(talloc_tos(), struct pai_entry);
444 if (!paie) {
445 return NULL;
446 }
447
448 paie->ace_flags = SEC_ACE_FLAG_INHERITED_ACE;
449 if (!get_pai_owner_type(paie, entry_offset)) {
450 TALLOC_FREE(paie);
451 return NULL;
452 }
453
454 if (!def_entry) {
455 DLIST_ADD(paiv->entry_list, paie);
456 } else {
457 DLIST_ADD(paiv->def_entry_list, paie);
458 }
459 entry_offset += PAI_V1_ENTRY_LENGTH;
460 }
461 return entry_offset;
462 }
463
464 /************************************************************************
465 Convert to in-memory format from version 1.
466 ************************************************************************/
467
468 static struct pai_val *create_pai_val_v1(const char *buf, size_t size)
469 {
470 const char *entry_offset;
471 struct pai_val *paiv = NULL;
472
473 if (!check_pai_ok_v1(buf, size)) {
474 return NULL;
475 }
476
477 paiv = talloc(talloc_tos(), struct pai_val);
478 if (!paiv) {
479 return NULL;
480 }
481
482 memset(paiv, '\0', sizeof(struct pai_val));
483
484 paiv->sd_type = (CVAL(buf,PAI_V1_FLAG_OFFSET) == PAI_V1_ACL_FLAG_PROTECTED) ?
485 SEC_DESC_DACL_PROTECTED : 0;
486
487 paiv->num_entries = SVAL(buf,PAI_V1_NUM_ENTRIES_OFFSET);
488 paiv->num_def_entries = SVAL(buf,PAI_V1_NUM_DEFAULT_ENTRIES_OFFSET);
489
490 entry_offset = buf + PAI_V1_ENTRIES_BASE;
491
492 DEBUG(10,("create_pai_val: num_entries = %u, num_def_entries = %u\n",
493 paiv->num_entries, paiv->num_def_entries ));
494
495 entry_offset = create_pai_v1_entries(paiv, entry_offset, false);
496 if (entry_offset == NULL) {
497 free_inherited_info(paiv);
498 return NULL;
499 }
500 entry_offset = create_pai_v1_entries(paiv, entry_offset, true);
501 if (entry_offset == NULL) {
502 free_inherited_info(paiv);
503 return NULL;
504 }
505
506 return paiv;
507 }
508
509 /************************************************************************
510 Process v2 entries.
511 ************************************************************************/
512
513 static const char *create_pai_v2_entries(struct pai_val *paiv,
514 unsigned int num_entries,
515 const char *entry_offset,
516 bool def_entry)
517 {
518 unsigned int i;
519
520 for (i = 0; i < num_entries; i++) {
521 struct pai_entry *paie = talloc(talloc_tos(), struct pai_entry);
522 if (!paie) {
523 return NULL;
524 }
525
526 paie->ace_flags = CVAL(entry_offset,0);
527
528 if (!get_pai_owner_type(paie, entry_offset+1)) {
529 TALLOC_FREE(paie);
530 return NULL;
531 }
532 if (!def_entry) {
533 DLIST_ADD(paiv->entry_list, paie);
534 } else {
535 DLIST_ADD(paiv->def_entry_list, paie);
536 }
537 entry_offset += PAI_V2_ENTRY_LENGTH;
538 }
539 return entry_offset;
540 }
541
542 /************************************************************************
543 Convert to in-memory format from version 2.
544 ************************************************************************/
545
546 static struct pai_val *create_pai_val_v2(const char *buf, size_t size)
547 {
548 const char *entry_offset;
549 struct pai_val *paiv = NULL;
550
551 if (!check_pai_ok_v2(buf, size)) {
552 return NULL;
553 }
554
555 paiv = talloc(talloc_tos(), struct pai_val);
556 if (!paiv) {
557 return NULL;
558 }
559
560 memset(paiv, '\0', sizeof(struct pai_val));
561
562 paiv->sd_type = SVAL(buf,PAI_V2_TYPE_OFFSET);
563
564 paiv->num_entries = SVAL(buf,PAI_V2_NUM_ENTRIES_OFFSET);
565 paiv->num_def_entries = SVAL(buf,PAI_V2_NUM_DEFAULT_ENTRIES_OFFSET);
566
567 entry_offset = buf + PAI_V2_ENTRIES_BASE;
568
569 DEBUG(10,("create_pai_val_v2: sd_type = 0x%x num_entries = %u, num_def_entries = %u\n",
570 (unsigned int)paiv->sd_type,
571 paiv->num_entries, paiv->num_def_entries ));
572
573 entry_offset = create_pai_v2_entries(paiv, paiv->num_entries,
574 entry_offset, false);
575 if (entry_offset == NULL) {
576 free_inherited_info(paiv);
577 return NULL;
578 }
579 entry_offset = create_pai_v2_entries(paiv, paiv->num_def_entries,
580 entry_offset, true);
581 if (entry_offset == NULL) {
582 free_inherited_info(paiv);
583 return NULL;
584 }
585
586 return paiv;
587 }
588
589 /************************************************************************
590 Convert to in-memory format - from either version 1 or 2.
591 ************************************************************************/
592
593 static struct pai_val *create_pai_val(const char *buf, size_t size)
594 {
595 if (size < 1) {
596 return NULL;
597 }
598 if (CVAL(buf,PAI_VERSION_OFFSET) == PAI_V1_VERSION) {
599 return create_pai_val_v1(buf, size);
600 } else if (CVAL(buf,PAI_VERSION_OFFSET) == PAI_V2_VERSION) {
601 return create_pai_val_v2(buf, size);
602 } else {
603 return NULL;
604 }
605 }
606
607 /************************************************************************
608 Load the user.SAMBA_PAI attribute.
609 ************************************************************************/
610
611 static struct pai_val *fload_inherited_info(files_struct *fsp)
612 {
613 char *pai_buf;
614 size_t pai_buf_size = 1024;
615 struct pai_val *paiv = NULL;
616 ssize_t ret;
617
618 if (!lp_map_acl_inherit(SNUM(fsp->conn))) {
619 return NULL;
620 }
621
622 if ((pai_buf = talloc_array(talloc_tos(), char, pai_buf_size)) == NULL) {
623 return NULL;
624 }
625
626 do {
627 if (fsp->fh->fd != -1) {
628 ret = SMB_VFS_FGETXATTR(fsp, SAMBA_POSIX_INHERITANCE_EA_NAME,
629 pai_buf, pai_buf_size);
630 } else {
631 ret = SMB_VFS_GETXATTR(fsp->conn,
632 fsp->fsp_name->base_name,
633 SAMBA_POSIX_INHERITANCE_EA_NAME,
634 pai_buf, pai_buf_size);
635 }
636
637 if (ret == -1) {
638 if (errno != ERANGE) {
639 break;
640 }
641 /* Buffer too small - enlarge it. */
642 pai_buf_size *= 2;
643 TALLOC_FREE(pai_buf);
644 if (pai_buf_size > 1024*1024) {
645 return NULL; /* Limit malloc to 1mb. */
646 }
647 if ((pai_buf = talloc_array(talloc_tos(), char, pai_buf_size)) == NULL)
648 return NULL;
649 }
650 } while (ret == -1);
651
652 DEBUG(10,("load_inherited_info: ret = %lu for file %s\n",
653 (unsigned long)ret, fsp_str_dbg(fsp)));
654
655 if (ret == -1) {
656 /* No attribute or not supported. */
657 #if defined(ENOATTR)
658 if (errno != ENOATTR)
659 DEBUG(10,("load_inherited_info: Error %s\n", strerror(errno) ));
660 #else
661 if (errno != ENOSYS)
662 DEBUG(10,("load_inherited_info: Error %s\n", strerror(errno) ));
663 #endif
664 TALLOC_FREE(pai_buf);
665 return NULL;
666 }
667
668 paiv = create_pai_val(pai_buf, ret);
669
670 if (paiv) {
671 DEBUG(10,("load_inherited_info: ACL type is 0x%x for file %s\n",
672 (unsigned int)paiv->sd_type, fsp_str_dbg(fsp)));
673 }
674
675 TALLOC_FREE(pai_buf);
676 return paiv;
677 }
678
679 /************************************************************************
680 Load the user.SAMBA_PAI attribute.
681 ************************************************************************/
682
683 static struct pai_val *load_inherited_info(const struct connection_struct *conn,
684 const char *fname)
685 {
686 char *pai_buf;
687 size_t pai_buf_size = 1024;
688 struct pai_val *paiv = NULL;
689 ssize_t ret;
690
691 if (!lp_map_acl_inherit(SNUM(conn))) {
692 return NULL;
693 }
694
695 if ((pai_buf = talloc_array(talloc_tos(), char, pai_buf_size)) == NULL) {
696 return NULL;
697 }
698
699 do {
700 ret = SMB_VFS_GETXATTR(conn, fname,
701 SAMBA_POSIX_INHERITANCE_EA_NAME,
702 pai_buf, pai_buf_size);
703
704 if (ret == -1) {
705 if (errno != ERANGE) {
706 break;
707 }
708 /* Buffer too small - enlarge it. */
709 pai_buf_size *= 2;
710 TALLOC_FREE(pai_buf);
711 if (pai_buf_size > 1024*1024) {
712 return NULL; /* Limit malloc to 1mb. */
713 }
714 if ((pai_buf = talloc_array(talloc_tos(), char, pai_buf_size)) == NULL)
715 return NULL;
716 }
717 } while (ret == -1);
718
719 DEBUG(10,("load_inherited_info: ret = %lu for file %s\n", (unsigned long)ret, fname));
720
721 if (ret == -1) {
722 /* No attribute or not supported. */
723 #if defined(ENOATTR)
724 if (errno != ENOATTR)
725 DEBUG(10,("load_inherited_info: Error %s\n", strerror(errno) ));
726 #else
727 if (errno != ENOSYS)
728 DEBUG(10,("load_inherited_info: Error %s\n", strerror(errno) ));
729 #endif
730 TALLOC_FREE(pai_buf);
731 return NULL;
732 }
733
734 paiv = create_pai_val(pai_buf, ret);
735
736 if (paiv) {
737 DEBUG(10,("load_inherited_info: ACL type 0x%x for file %s\n",
738 (unsigned int)paiv->sd_type,
739 fname));
740 }
741
742 TALLOC_FREE(pai_buf);
743 return paiv;
744 }
745
746 /****************************************************************************
747 Functions to manipulate the internal ACE format.
748 ****************************************************************************/
749
750 /****************************************************************************
751 Count a linked list of canonical ACE entries.
752 ****************************************************************************/
753
754 static size_t count_canon_ace_list( canon_ace *l_head )
755 {
756 size_t count = 0;
757 canon_ace *ace;
758
759 for (ace = l_head; ace; ace = ace->next)
760 count++;
761
762 return count;
763 }
764
765 /****************************************************************************
766 Free a linked list of canonical ACE entries.
767 ****************************************************************************/
768
769 static void free_canon_ace_list( canon_ace *l_head )
770 {
771 canon_ace *list, *next;
772
773 for (list = l_head; list; list = next) {
774 next = list->next;
775 DLIST_REMOVE(l_head, list);
776 TALLOC_FREE(list);
777 }
778 }
779
780 /****************************************************************************
781 Function to duplicate a canon_ace entry.
782 ****************************************************************************/
783
784 static canon_ace *dup_canon_ace( canon_ace *src_ace)
785 {
786 canon_ace *dst_ace = talloc(talloc_tos(), canon_ace);
787
788 if (dst_ace == NULL)
789 return NULL;
790
791 *dst_ace = *src_ace;
792 dst_ace->prev = dst_ace->next = NULL;
793 return dst_ace;
794 }
795
796 /****************************************************************************
797 Print out a canon ace.
798 ****************************************************************************/
799
800 static void print_canon_ace(canon_ace *pace, int num)
801 {
802 dbgtext( "canon_ace index %d. Type = %s ", num, pace->attr == ALLOW_ACE ? "allow" : "deny" );
803 dbgtext( "SID = %s ", sid_string_dbg(&pace->trustee));
804 if (pace->owner_type == UID_ACE) {
805 const char *u_name = uidtoname(pace->unix_ug.id);
806 dbgtext( "uid %u (%s) ", (unsigned int)pace->unix_ug.id, u_name );
807 } else if (pace->owner_type == GID_ACE) {
808 char *g_name = gidtoname(pace->unix_ug.id);
809 dbgtext( "gid %u (%s) ", (unsigned int)pace->unix_ug.id, g_name );
810 } else
811 dbgtext( "other ");
812 switch (pace->type) {
813 case SMB_ACL_USER:
814 dbgtext( "SMB_ACL_USER ");
815 break;
816 case SMB_ACL_USER_OBJ:
817 dbgtext( "SMB_ACL_USER_OBJ ");
818 break;
819 case SMB_ACL_GROUP:
820 dbgtext( "SMB_ACL_GROUP ");
821 break;
822 case SMB_ACL_GROUP_OBJ:
823 dbgtext( "SMB_ACL_GROUP_OBJ ");
824 break;
825 case SMB_ACL_OTHER:
826 dbgtext( "SMB_ACL_OTHER ");
827 break;
828 default:
829 dbgtext( "MASK " );
830 break;
831 }
832
833 dbgtext( "ace_flags = 0x%x ", (unsigned int)pace->ace_flags);
834 dbgtext( "perms ");
835 dbgtext( "%c", pace->perms & S_IRUSR ? 'r' : '-');
836 dbgtext( "%c", pace->perms & S_IWUSR ? 'w' : '-');
837 dbgtext( "%c\n", pace->perms & S_IXUSR ? 'x' : '-');
838 }
839
840 /****************************************************************************
841 Print out a canon ace list.
842 ****************************************************************************/
843
844 static void print_canon_ace_list(const char *name, canon_ace *ace_list)
845 {
846 int count = 0;
847
848 if( DEBUGLVL( 10 )) {
849 dbgtext( "print_canon_ace_list: %s\n", name );
850 for (;ace_list; ace_list = ace_list->next, count++)
851 print_canon_ace(ace_list, count );
852 }
853 }
854
855 /****************************************************************************
856 Map POSIX ACL perms to canon_ace permissions (a mode_t containing only S_(R|W|X)USR bits).
857 ****************************************************************************/
858
859 static mode_t convert_permset_to_mode_t(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 static mode_t unix_perms_to_acl_perms(mode_t mode, int r_mask, int w_mask, int x_mask)
875 {
876 mode_t ret = 0;
877
878 if (mode & r_mask)
879 ret |= S_IRUSR;
880 if (mode & w_mask)
881 ret |= S_IWUSR;
882 if (mode & x_mask)
883 ret |= S_IXUSR;
884
885 return ret;
886 }
887
888 /****************************************************************************
889 Map canon_ace permissions (a mode_t containing only S_(R|W|X)USR bits) to
890 an SMB_ACL_PERMSET_T.
891 ****************************************************************************/
892
893 static int map_acl_perms_to_permset(connection_struct *conn, mode_t mode, SMB_ACL_PERMSET_T *p_permset)
894 {
895 if (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 void create_file_sids(const SMB_STRUCT_STAT *psbuf, struct dom_sid *powner_sid, struct dom_sid *pgroup_sid)
917 {
918 uid_to_sid( powner_sid, psbuf->st_ex_uid );
919 gid_to_sid( pgroup_sid, psbuf->st_ex_gid );
920 }
921
922 /****************************************************************************
923 Merge aces with a common UID or GID - if both are allow or deny, OR the permissions together and
924 delete the second one. If the first is deny, mask the permissions off and delete the allow
925 if the permissions become zero, delete the deny if the permissions are non zero.
926 ****************************************************************************/
927
928 static void merge_aces( canon_ace **pp_list_head, bool dir_acl)
929 {
930 canon_ace *l_head = *pp_list_head;
931 canon_ace *curr_ace_outer;
932 canon_ace *curr_ace_outer_next;
933
934 /*
935 * First, merge allow entries with identical SIDs, and deny entries
936 * with identical SIDs.
937 */
938
939 for (curr_ace_outer = l_head; curr_ace_outer; curr_ace_outer = curr_ace_outer_next) {
940 canon_ace *curr_ace;
941 canon_ace *curr_ace_next;
942
943 curr_ace_outer_next = curr_ace_outer->next; /* Save the link in case we delete. */
944
945 for (curr_ace = curr_ace_outer->next; curr_ace; curr_ace = curr_ace_next) {
946 bool can_merge = false;
947
948 curr_ace_next = curr_ace->next; /* Save the link in case of delete. */
949
950 /* For file ACLs we can merge if the SIDs and ALLOW/DENY
951 * types are the same. For directory acls we must also
952 * ensure the POSIX ACL types are the same.
953 *
954 * For the IDMAP_BOTH case, we must not merge
955 * the UID and GID ACE values for same SID
956 */
957
958 if (!dir_acl) {
959 can_merge = (curr_ace->unix_ug.id == curr_ace_outer->unix_ug.id &&
960 curr_ace->owner_type == curr_ace_outer->owner_type &&
961 (curr_ace->attr == curr_ace_outer->attr));
962 } else {
963 can_merge = (curr_ace->unix_ug.id == curr_ace_outer->unix_ug.id &&
964 curr_ace->owner_type == curr_ace_outer->owner_type &&
965 (curr_ace->type == curr_ace_outer->type) &&
966 (curr_ace->attr == curr_ace_outer->attr));
967 }
968
969 if (can_merge) {
970 if( DEBUGLVL( 10 )) {
971 dbgtext("merge_aces: Merging ACE's\n");
972 print_canon_ace( curr_ace_outer, 0);
973 print_canon_ace( curr_ace, 0);
974 }
975
976 /* Merge two allow or two deny ACE's. */
977
978 /* Theoretically we shouldn't merge a dir ACE if
979 * one ACE has the CI flag set, and the other
980 * ACE has the OI flag set, but this is rare
981 * enough we can ignore it. */
982
983 curr_ace_outer->perms |= curr_ace->perms;
984 curr_ace_outer->ace_flags |= curr_ace->ace_flags;
985 DLIST_REMOVE(l_head, curr_ace);
986 TALLOC_FREE(curr_ace);
987 curr_ace_outer_next = curr_ace_outer->next; /* We may have deleted the link. */
988 }
989 }
990 }
991
992 /*
993 * Now go through and mask off allow permissions with deny permissions.
994 * We can delete either the allow or deny here as we know that each SID
995 * appears only once in the list.
996 */
997
998 for (curr_ace_outer = l_head; curr_ace_outer; curr_ace_outer = curr_ace_outer_next) {
999 canon_ace *curr_ace;
1000 canon_ace *curr_ace_next;
1001
1002 curr_ace_outer_next = curr_ace_outer->next; /* Save the link in case we delete. */
1003
1004 for (curr_ace = curr_ace_outer->next; curr_ace; curr_ace = curr_ace_next) {
1005
1006 curr_ace_next = curr_ace->next; /* Save the link in case of delete. */
1007
1008 /*
1009 * Subtract ACE's with different entries. Due to the ordering constraints
1010 * we've put on the ACL, we know the deny must be the first one.
1011 */
1012
1013 if (curr_ace->unix_ug.id == curr_ace_outer->unix_ug.id &&
1014 (curr_ace->owner_type == curr_ace_outer->owner_type) &&
1015 (curr_ace_outer->attr == DENY_ACE) && (curr_ace->attr == ALLOW_ACE)) {
1016
1017 if( DEBUGLVL( 10 )) {
1018 dbgtext("merge_aces: Masking ACE's\n");
1019 print_canon_ace( curr_ace_outer, 0);
1020 print_canon_ace( curr_ace, 0);
1021 }
1022
1023 curr_ace->perms &= ~curr_ace_outer->perms;
1024
1025 if (curr_ace->perms == 0) {
1026
1027 /*
1028 * The deny overrides the allow. Remove the allow.
1029 */
1030
1031 DLIST_REMOVE(l_head, curr_ace);
1032 TALLOC_FREE(curr_ace);
1033 curr_ace_outer_next = curr_ace_outer->next; /* We may have deleted the link. */
1034
1035 } else {
1036
1037 /*
1038 * Even after removing permissions, there
1039 * are still allow permissions - delete the deny.
1040 * It is safe to delete the deny here,
1041 * as we are guarenteed by the deny first
1042 * ordering that all the deny entries for
1043 * this SID have already been merged into one
1044 * before we can get to an allow ace.
1045 */
1046
1047 DLIST_REMOVE(l_head, curr_ace_outer);
1048 TALLOC_FREE(curr_ace_outer);
1049 break;
1050 }
1051 }
1052
1053 } /* end for curr_ace */
1054 } /* end for curr_ace_outer */
1055
1056 /* We may have modified the list. */
1057
1058 *pp_list_head = l_head;
1059 }
1060
1061 /****************************************************************************
1062 Map canon_ace perms to permission bits NT.
1063 The attr element is not used here - we only process deny entries on set,
1064 not get. Deny entries are implicit on get with ace->perms = 0.
1065 ****************************************************************************/
1066
1067 uint32_t map_canon_ace_perms(int snum,
1068 enum security_ace_type *pacl_type,
1069 mode_t perms,
1070 bool directory_ace)
1071 {
1072 uint32_t nt_mask = 0;
1073
1074 *pacl_type = SEC_ACE_TYPE_ACCESS_ALLOWED;
1075
1076 if (lp_acl_map_full_control(snum) && ((perms & ALL_ACE_PERMS) == ALL_ACE_PERMS)) {
1077 if (directory_ace) {
1078 nt_mask = UNIX_DIRECTORY_ACCESS_RWX;
1079 } else {
1080 nt_mask = (UNIX_ACCESS_RWX & ~DELETE_ACCESS);
1081 }
1082 } else if ((perms & ALL_ACE_PERMS) == (mode_t)0) {
1083 /*
1084 * Windows NT refuses to display ACEs with no permissions in them (but
1085 * they are perfectly legal with Windows 2000). If the ACE has empty
1086 * permissions we cannot use 0, so we use the otherwise unused
1087 * WRITE_OWNER permission, which we ignore when we set an ACL.
1088 * We abstract this into a #define of UNIX_ACCESS_NONE to allow this
1089 * to be changed in the future.
1090 */
1091
1092 nt_mask = 0;
1093 } else {
1094 if (directory_ace) {
1095 nt_mask |= ((perms & S_IRUSR) ? UNIX_DIRECTORY_ACCESS_R : 0 );
1096 nt_mask |= ((perms & S_IWUSR) ? UNIX_DIRECTORY_ACCESS_W : 0 );
1097 nt_mask |= ((perms & S_IXUSR) ? UNIX_DIRECTORY_ACCESS_X : 0 );
1098 } else {
1099 nt_mask |= ((perms & S_IRUSR) ? UNIX_ACCESS_R : 0 );
1100 nt_mask |= ((perms & S_IWUSR) ? UNIX_ACCESS_W : 0 );
1101 nt_mask |= ((perms & S_IXUSR) ? UNIX_ACCESS_X : 0 );
1102 }
1103 }
1104
1105 if ((perms & S_IWUSR) && lp_dos_filemode(snum)) {
1106 nt_mask |= (SEC_STD_WRITE_DAC|SEC_STD_WRITE_OWNER|DELETE_ACCESS);
1107 }
1108
1109 DEBUG(10,("map_canon_ace_perms: Mapped (UNIX) %x to (NT) %x\n",
1110 (unsigned int)perms, (unsigned int)nt_mask ));
1111
1112 return nt_mask;
1113 }
1114
1115 /****************************************************************************
1116 Map NT perms to a UNIX mode_t.
1117 ****************************************************************************/
1118
1119 #define FILE_SPECIFIC_READ_BITS (FILE_READ_DATA|FILE_READ_EA)
1120 #define FILE_SPECIFIC_WRITE_BITS (FILE_WRITE_DATA|FILE_APPEND_DATA|FILE_WRITE_EA)
1121 #define FILE_SPECIFIC_EXECUTE_BITS (FILE_EXECUTE)
1122
1123 static mode_t map_nt_perms( uint32 *mask, int type)
1124 {
1125 mode_t mode = 0;
1126
1127 switch(type) {
1128 case S_IRUSR:
1129 if((*mask) & GENERIC_ALL_ACCESS)
1130 mode = S_IRUSR|S_IWUSR|S_IXUSR;
1131 else {
1132 mode |= ((*mask) & (GENERIC_READ_ACCESS|FILE_SPECIFIC_READ_BITS)) ? S_IRUSR : 0;
1133 mode |= ((*mask) & (GENERIC_WRITE_ACCESS|FILE_SPECIFIC_WRITE_BITS)) ? S_IWUSR : 0;
1134 mode |= ((*mask) & (GENERIC_EXECUTE_ACCESS|FILE_SPECIFIC_EXECUTE_BITS)) ? S_IXUSR : 0;
1135 }
1136 break;
1137 case S_IRGRP:
1138 if((*mask) & GENERIC_ALL_ACCESS)
1139 mode = S_IRGRP|S_IWGRP|S_IXGRP;
1140 else {
1141 mode |= ((*mask) & (GENERIC_READ_ACCESS|FILE_SPECIFIC_READ_BITS)) ? S_IRGRP : 0;
1142 mode |= ((*mask) & (GENERIC_WRITE_ACCESS|FILE_SPECIFIC_WRITE_BITS)) ? S_IWGRP : 0;
1143 mode |= ((*mask) & (GENERIC_EXECUTE_ACCESS|FILE_SPECIFIC_EXECUTE_BITS)) ? S_IXGRP : 0;
1144 }
1145 break;
1146 case S_IROTH:
1147 if((*mask) & GENERIC_ALL_ACCESS)
1148 mode = S_IROTH|S_IWOTH|S_IXOTH;
1149 else {
1150 mode |= ((*mask) & (GENERIC_READ_ACCESS|FILE_SPECIFIC_READ_BITS)) ? S_IROTH : 0;
1151 mode |= ((*mask) & (GENERIC_WRITE_ACCESS|FILE_SPECIFIC_WRITE_BITS)) ? S_IWOTH : 0;
1152 mode |= ((*mask) & (GENERIC_EXECUTE_ACCESS|FILE_SPECIFIC_EXECUTE_BITS)) ? S_IXOTH : 0;
1153 }
1154 break;
1155 }
1156
1157 return mode;
1158 }
1159
1160 /****************************************************************************
1161 Unpack a struct security_descriptor into a UNIX owner and group.
1162 ****************************************************************************/
1163
1164 NTSTATUS unpack_nt_owners(struct connection_struct *conn,
1165 uid_t *puser, gid_t *pgrp,
1166 uint32 security_info_sent, const struct
1167 security_descriptor *psd)
1168 {
1169 struct dom_sid owner_sid;
1170 struct dom_sid grp_sid;
1171
1172 *puser = (uid_t)-1;
1173 *pgrp = (gid_t)-1;
1174
1175 if(security_info_sent == 0) {
1176 DEBUG(0,("unpack_nt_owners: no security info sent !\n"));
1177 return NT_STATUS_OK;
1178 }
1179
1180 /*
1181 * Validate the owner and group SID's.
1182 */
1183
1184 memset(&owner_sid, '\0', sizeof(owner_sid));
1185 memset(&grp_sid, '\0', sizeof(grp_sid));
1186
1187 DEBUG(5,("unpack_nt_owners: validating owner_sids.\n"));
1188
1189 /*
1190 * Don't immediately fail if the owner sid cannot be validated.
1191 * This may be a group chown only set.
1192 */
1193
1194 if (security_info_sent & SECINFO_OWNER) {
1195 sid_copy(&owner_sid, psd->owner_sid);
1196 if (!sid_to_uid(&owner_sid, puser)) {
1197 if (lp_force_unknown_acl_user(SNUM(conn))) {
1198 /* this allows take ownership to work
1199 * reasonably */
1200 *puser = get_current_uid(conn);
1201 } else {
1202 DEBUG(3,("unpack_nt_owners: unable to validate"
1203 " owner sid for %s\n",
1204 sid_string_dbg(&owner_sid)));
1205 return NT_STATUS_INVALID_OWNER;
1206 }
1207 }
1208 DEBUG(3,("unpack_nt_owners: owner sid mapped to uid %u\n",
1209 (unsigned int)*puser ));
1210 }
1211
1212 /*
1213 * Don't immediately fail if the group sid cannot be validated.
1214 * This may be an owner chown only set.
1215 */
1216
1217 if (security_info_sent & SECINFO_GROUP) {
1218 sid_copy(&grp_sid, psd->group_sid);
1219 if (!sid_to_gid( &grp_sid, pgrp)) {
1220 if (lp_force_unknown_acl_user(SNUM(conn))) {
1221 /* this allows take group ownership to work
1222 * reasonably */
1223 *pgrp = get_current_gid(conn);
1224 } else {
1225 DEBUG(3,("unpack_nt_owners: unable to validate"
1226 " group sid.\n"));
1227 return NT_STATUS_INVALID_OWNER;
1228 }
1229 }
1230 DEBUG(3,("unpack_nt_owners: group sid mapped to gid %u\n",
1231 (unsigned int)*pgrp));
1232 }
1233
1234 DEBUG(5,("unpack_nt_owners: owner_sids validated.\n"));
1235
1236 return NT_STATUS_OK;
1237 }
1238
1239
1240 static void trim_ace_perms(canon_ace *pace)
1241 {
1242 pace->perms = pace->perms & (S_IXUSR|S_IWUSR|S_IRUSR);
1243 }
1244
1245 static void ensure_minimal_owner_ace_perms(const bool is_directory,
1246 canon_ace *pace)
1247 {
1248 pace->perms |= S_IRUSR;
1249 if (is_directory) {
1250 pace->perms |= (S_IWUSR|S_IXUSR);
1251 }
1252 }
1253
1254 /****************************************************************************
1255 Check if a given uid/SID is in a group gid/SID. This is probably very
1256 expensive and will need optimisation. A *lot* of optimisation :-). JRA.
1257 ****************************************************************************/
1258
1259 static bool uid_entry_in_group(connection_struct *conn, canon_ace *uid_ace, canon_ace *group_ace )
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 it's the current user, we already have the unix token
1268 * and don't need to do the complex user_in_group_sid() call
1269 */
1270 if (uid_ace->unix_ug.id == get_current_uid(conn)) {
1271 const struct security_unix_token *curr_utok = NULL;
1272 size_t i;
1273
1274 if (group_ace->unix_ug.id == get_current_gid(conn)) {
1275 return True;
1276 }
1277
1278 curr_utok = get_current_utok(conn);
1279 for (i=0; i < curr_utok->ngroups; i++) {
1280 if (group_ace->unix_ug.id == curr_utok->groups[i]) {
1281 return True;
1282 }
1283 }
1284 }
1285
1286 /*
1287 * user_in_group_sid() uses create_token_from_sid()
1288 * which creates an artificial NT token given just a username,
1289 * so this is not reliable for users from foreign domains
1290 * exported by winbindd!
1291 */
1292 return user_sid_in_group_sid(&uid_ace->trustee, &group_ace->trustee);
1293 }
1294
1295 /****************************************************************************
1296 A well formed POSIX file or default ACL has at least 3 entries, a
1297 SMB_ACL_USER_OBJ, SMB_ACL_GROUP_OBJ, SMB_ACL_OTHER_OBJ.
1298 In addition, the owner must always have at least read access.
1299 When using this call on get_acl, the pst struct is valid and contains
1300 the mode of the file.
1301 ****************************************************************************/
1302
1303 static bool ensure_canon_entry_valid_on_get(connection_struct *conn,
1304 canon_ace **pp_ace,
1305 const struct dom_sid *pfile_owner_sid,
1306 const struct dom_sid *pfile_grp_sid,
1307 const SMB_STRUCT_STAT *pst)
1308 {
1309 canon_ace *pace;
1310 bool got_user = false;
1311 bool got_group = false;
1312 bool got_other = false;
1313
1314 for (pace = *pp_ace; pace; pace = pace->next) {
1315 if (pace->type == SMB_ACL_USER_OBJ) {
1316 got_user = true;
1317 } else if (pace->type == SMB_ACL_GROUP_OBJ) {
1318 got_group = true;
1319 } else if (pace->type == SMB_ACL_OTHER) {
1320 got_other = true;
1321 }
1322 }
1323
1324 if (!got_user) {
1325 if ((pace = talloc(talloc_tos(), canon_ace)) == NULL) {
1326 DEBUG(0,("malloc fail.\n"));
1327 return false;
1328 }
1329
1330 ZERO_STRUCTP(pace);
1331 pace->type = SMB_ACL_USER_OBJ;
1332 pace->owner_type = UID_ACE;
1333 pace->unix_ug.type = ID_TYPE_UID;
1334 pace->unix_ug.id = pst->st_ex_uid;
1335 pace->trustee = *pfile_owner_sid;
1336 pace->attr = ALLOW_ACE;
1337 pace->perms = unix_perms_to_acl_perms(pst->st_ex_mode, S_IRUSR, S_IWUSR, S_IXUSR);
1338 DLIST_ADD(*pp_ace, pace);
1339 }
1340
1341 if (!got_group) {
1342 if ((pace = talloc(talloc_tos(), canon_ace)) == NULL) {
1343 DEBUG(0,("malloc fail.\n"));
1344 return false;
1345 }
1346
1347 ZERO_STRUCTP(pace);
1348 pace->type = SMB_ACL_GROUP_OBJ;
1349 pace->owner_type = GID_ACE;
1350 pace->unix_ug.type = ID_TYPE_GID;
1351 pace->unix_ug.id = pst->st_ex_gid;
1352 pace->trustee = *pfile_grp_sid;
1353 pace->attr = ALLOW_ACE;
1354 pace->perms = unix_perms_to_acl_perms(pst->st_ex_mode, S_IRGRP, S_IWGRP, S_IXGRP);
1355 DLIST_ADD(*pp_ace, pace);
1356 }
1357
1358 if (!got_other) {
1359 if ((pace = talloc(talloc_tos(), canon_ace)) == NULL) {
1360 DEBUG(0,("malloc fail.\n"));
1361 return false;
1362 }
1363
1364 ZERO_STRUCTP(pace);
1365 pace->type = SMB_ACL_OTHER;
1366 pace->owner_type = WORLD_ACE;
1367 pace->unix_ug.type = ID_TYPE_NOT_SPECIFIED;
1368 pace->unix_ug.id = -1;
1369 pace->trustee = global_sid_World;
1370 pace->attr = ALLOW_ACE;
1371 pace->perms = unix_perms_to_acl_perms(pst->st_ex_mode, S_IROTH, S_IWOTH, S_IXOTH);
1372 DLIST_ADD(*pp_ace, pace);
1373 }
1374
1375 return true;
1376 }
1377
1378 /****************************************************************************
1379 A well formed POSIX file or default ACL has at least 3 entries, a
1380 SMB_ACL_USER_OBJ, SMB_ACL_GROUP_OBJ, SMB_ACL_OTHER_OBJ.
1381 In addition, the owner must always have at least read access.
1382 When using this call on set_acl, the pst struct has
1383 been modified to have a mode containing the default for this file or directory
1384 type.
1385 ****************************************************************************/
1386
1387 static bool ensure_canon_entry_valid_on_set(connection_struct *conn,
1388 canon_ace **pp_ace,
1389 bool is_default_acl,
1390 const struct share_params *params,
1391 const bool is_directory,
1392 const struct dom_sid *pfile_owner_sid,
1393 const struct dom_sid *pfile_grp_sid,
1394 const SMB_STRUCT_STAT *pst)
1395 {
1396 canon_ace *pace;
1397 canon_ace *pace_user = NULL;
1398 canon_ace *pace_group = NULL;
1399 canon_ace *pace_other = NULL;
1400 bool got_duplicate_user = false;
1401 bool got_duplicate_group = false;
1402
1403 for (pace = *pp_ace; pace; pace = pace->next) {
1404 trim_ace_perms(pace);
1405 if (pace->type == SMB_ACL_USER_OBJ) {
1406 ensure_minimal_owner_ace_perms(is_directory, pace);
1407 pace_user = pace;
1408 } else if (pace->type == SMB_ACL_GROUP_OBJ) {
1409 pace_group = pace;
1410 } else if (pace->type == SMB_ACL_OTHER) {
1411 pace_other = pace;
1412 }
1413 }
1414
1415 if (!pace_user) {
1416 canon_ace *pace_iter;
1417
1418 if ((pace = talloc(talloc_tos(), canon_ace)) == NULL) {
1419 DEBUG(0,("talloc fail.\n"));
1420 return false;
1421 }
1422
1423 ZERO_STRUCTP(pace);
1424 pace->type = SMB_ACL_USER_OBJ;
1425 pace->owner_type = UID_ACE;
1426 pace->unix_ug.type = ID_TYPE_UID;
1427 pace->unix_ug.id = pst->st_ex_uid;
1428 pace->trustee = *pfile_owner_sid;
1429 pace->attr = ALLOW_ACE;
1430 /* Start with existing user permissions, principle of least
1431 surprises for the user. */
1432 pace->perms = unix_perms_to_acl_perms(pst->st_ex_mode, S_IRUSR, S_IWUSR, S_IXUSR);
1433
1434 /* See if the owning user is in any of the other groups in
1435 the ACE, or if there's a matching user entry (by uid
1436 or in the case of ID_TYPE_BOTH by SID).
1437 If so, OR in the permissions from that entry. */
1438
1439
1440 for (pace_iter = *pp_ace; pace_iter; pace_iter = pace_iter->next) {
1441 if (pace_iter->type == SMB_ACL_USER &&
1442 pace_iter->unix_ug.id == pace->unix_ug.id) {
1443 pace->perms |= pace_iter->perms;
1444 } else if (pace_iter->type == SMB_ACL_GROUP_OBJ || pace_iter->type == SMB_ACL_GROUP) {
1445 if (dom_sid_equal(&pace->trustee, &pace_iter->trustee)) {
1446 pace->perms |= pace_iter->perms;
1447 } else if (uid_entry_in_group(conn, pace, pace_iter)) {
1448 pace->perms |= pace_iter->perms;
1449 }
1450 }
1451 }
1452
1453 if (pace->perms == 0) {
1454 /* If we only got an "everyone" perm, just use that. */
1455 if (pace_other)
1456 pace->perms = pace_other->perms;
1457 }
1458
1459 /*
1460 * Ensure we have default parameters for the
1461 * user (owner) even on default ACLs.
1462 */
1463 ensure_minimal_owner_ace_perms(is_directory, pace);
1464
1465 DLIST_ADD(*pp_ace, pace);
1466 pace_user = pace;
1467 }
1468
1469 if (!pace_group) {
1470 if ((pace = talloc(talloc_tos(), canon_ace)) == NULL) {
1471 DEBUG(0,("talloc fail.\n"));
1472 return false;
1473 }
1474
1475 ZERO_STRUCTP(pace);
1476 pace->type = SMB_ACL_GROUP_OBJ;
1477 pace->owner_type = GID_ACE;
1478 pace->unix_ug.type = ID_TYPE_GID;
1479 pace->unix_ug.id = pst->st_ex_gid;
1480 pace->trustee = *pfile_grp_sid;
1481 pace->attr = ALLOW_ACE;
1482
1483 /* If we only got an "everyone" perm, just use that. */
1484 if (pace_other) {
1485 pace->perms = pace_other->perms;
1486 } else {
1487 pace->perms = 0;
1488 }
1489
1490 DLIST_ADD(*pp_ace, pace);
1491 pace_group = pace;
1492 }
1493
1494 if (!pace_other) {
1495 if ((pace = talloc(talloc_tos(), canon_ace)) == NULL) {
1496 DEBUG(0,("talloc fail.\n"));
1497 return false;
1498 }
1499
1500 ZERO_STRUCTP(pace);
1501 pace->type = SMB_ACL_OTHER;
1502 pace->owner_type = WORLD_ACE;
1503 pace->unix_ug.type = ID_TYPE_NOT_SPECIFIED;
1504 pace->unix_ug.id = -1;
1505 pace->trustee = global_sid_World;
1506 pace->attr = ALLOW_ACE;
1507 pace->perms = 0;
1508
1509 DLIST_ADD(*pp_ace, pace);
1510 pace_other = pace;
1511 }
1512
1513 /* Ensure when setting a POSIX ACL, that the uid for a
1514 SMB_ACL_USER_OBJ ACE (the owner ACE entry) has a duplicate
1515 permission entry as an SMB_ACL_USER, and a gid for a
1516 SMB_ACL_GROUP_OBJ ACE (the primary group ACE entry) also has
1517 a duplicate permission entry as an SMB_ACL_GROUP. If not,
1518 then if the ownership or group ownership of this file or
1519 directory gets changed, the user or group can lose their
1520 access. */
1521
1522 for (pace = *pp_ace; pace; pace = pace->next) {
1523 if (pace->type == SMB_ACL_USER &&
1524 pace->unix_ug.id == pace_user->unix_ug.id) {
1525 /* Already got one. */
1526 got_duplicate_user = true;
1527 } else if (pace->type == SMB_ACL_GROUP &&
1528 pace->unix_ug.id == pace_group->unix_ug.id) {
1529 /* Already got one. */
1530 got_duplicate_group = true;
1531 } else if ((pace->type == SMB_ACL_GROUP)
1532 && (dom_sid_equal(&pace->trustee, &pace_user->trustee))) {
1533 /* If the SID owning the file appears
1534 * in a group entry, then we have
1535 * enough duplication, they will still
1536 * have access */
1537 got_duplicate_user = true;
1538 }
1539 }
1540
1541 /* If the SID is equal for the user and group that we need
1542 to add the duplicate for, add only the group */
1543 if (!got_duplicate_user && !got_duplicate_group
1544 && dom_sid_equal(&pace_group->trustee,
1545 &pace_user->trustee)) {
1546 /* Add a duplicate SMB_ACL_GROUP entry, this
1547 * will cover the owning SID as well, as it
1548 * will always be mapped to both a uid and
1549 * gid. */
1550
1551 if ((pace = talloc(talloc_tos(), canon_ace)) == NULL) {
1552 DEBUG(0,("talloc fail.\n"));
1553 return false;
1554 }
1555
1556 ZERO_STRUCTP(pace);
1557 pace->type = SMB_ACL_GROUP;;
1558 pace->owner_type = GID_ACE;
1559 pace->unix_ug.type = ID_TYPE_GID;
1560 pace->unix_ug.id = pace_group->unix_ug.id;
1561 pace->trustee = pace_group->trustee;
1562 pace->attr = pace_group->attr;
1563 pace->perms = pace_group->perms;
1564
1565 DLIST_ADD(*pp_ace, pace);
1566
1567 /* We're done here, make sure the
1568 statements below are not executed. */
1569 got_duplicate_user = true;
1570 got_duplicate_group = true;
1571 }
1572
1573 if (!got_duplicate_user) {
1574 /* Add a duplicate SMB_ACL_USER entry. */
1575 if ((pace = talloc(talloc_tos(), canon_ace)) == NULL) {
1576 DEBUG(0,("talloc fail.\n"));
1577 return false;
1578 }
1579
1580 ZERO_STRUCTP(pace);
1581 pace->type = SMB_ACL_USER;;
1582 pace->owner_type = UID_ACE;
1583 pace->unix_ug.type = ID_TYPE_UID;
1584 pace->unix_ug.id = pace_user->unix_ug.id;
1585 pace->trustee = pace_user->trustee;
1586 pace->attr = pace_user->attr;
1587 pace->perms = pace_user->perms;
1588
1589 DLIST_ADD(*pp_ace, pace);
1590
1591 got_duplicate_user = true;
1592 }
1593
1594 if (!got_duplicate_group) {
1595 /* Add a duplicate SMB_ACL_GROUP entry. */
1596 if ((pace = talloc(talloc_tos(), canon_ace)) == NULL) {
1597 DEBUG(0,("talloc fail.\n"));
1598 return false;
1599 }
1600
1601 ZERO_STRUCTP(pace);
1602 pace->type = SMB_ACL_GROUP;;
1603 pace->owner_type = GID_ACE;
1604 pace->unix_ug.type = ID_TYPE_GID;
1605 pace->unix_ug.id = pace_group->unix_ug.id;
1606 pace->trustee = pace_group->trustee;
1607 pace->attr = pace_group->attr;
1608 pace->perms = pace_group->perms;
1609
1610 DLIST_ADD(*pp_ace, pace);
1611
1612 got_duplicate_group = true;
1613 }
1614
1615 return true;
1616 }
1617
1618 /****************************************************************************
1619 Check if a POSIX ACL has the required SMB_ACL_USER_OBJ and SMB_ACL_GROUP_OBJ entries.
1620 If it does not have them, check if there are any entries where the trustee is the
1621 file owner or the owning group, and map these to SMB_ACL_USER_OBJ and SMB_ACL_GROUP_OBJ.
1622 Note we must not do this to default directory ACLs.
1623 ****************************************************************************/
1624
1625 static void check_owning_objs(canon_ace *ace, struct dom_sid *pfile_owner_sid, struct dom_sid *pfile_grp_sid)
1626 {
1627 bool got_user_obj, got_group_obj;
1628 canon_ace *current_ace;
1629 int i, entries;
1630
1631 entries = count_canon_ace_list(ace);
1632 got_user_obj = False;
1633 got_group_obj = False;
1634
1635 for (i=0, current_ace = ace; i < entries; i++, current_ace = current_ace->next) {
1636 if (current_ace->type == SMB_ACL_USER_OBJ)
1637 got_user_obj = True;
1638 else if (current_ace->type == SMB_ACL_GROUP_OBJ)
1639 got_group_obj = True;
1640 }
1641 if (got_user_obj && got_group_obj) {
1642 DEBUG(10,("check_owning_objs: ACL had owning user/group entries.\n"));
1643 return;
1644 }
1645
1646 for (i=0, current_ace = ace; i < entries; i++, current_ace = current_ace->next) {
1647 if (!got_user_obj && current_ace->owner_type == UID_ACE &&
1648 dom_sid_equal(&current_ace->trustee, pfile_owner_sid)) {
1649 current_ace->type = SMB_ACL_USER_OBJ;
1650 got_user_obj = True;
1651 }
1652 if (!got_group_obj && current_ace->owner_type == GID_ACE &&
1653 dom_sid_equal(&current_ace->trustee, pfile_grp_sid)) {
1654 current_ace->type = SMB_ACL_GROUP_OBJ;
1655 got_group_obj = True;
1656 }
1657 }
1658 if (!got_user_obj)
1659 DEBUG(10,("check_owning_objs: ACL is missing an owner entry.\n"));
1660 if (!got_group_obj)
1661 DEBUG(10,("check_owning_objs: ACL is missing an owning group entry.\n"));
1662 }
1663
1664 static bool add_current_ace_to_acl(files_struct *fsp, struct security_ace *psa,
1665 canon_ace **file_ace, canon_ace **dir_ace,
1666 bool *got_file_allow, bool *got_dir_allow,
1667 bool *all_aces_are_inherit_only,
1668 canon_ace *current_ace)
1669 {
1670
1671 /*
1672 * Map the given NT permissions into a UNIX mode_t containing only
1673 * S_I(R|W|X)USR bits.
1674 */
1675
1676 current_ace->perms |= map_nt_perms( &psa->access_mask, S_IRUSR);
1677 current_ace->attr = (psa->type == SEC_ACE_TYPE_ACCESS_ALLOWED) ? ALLOW_ACE : DENY_ACE;
1678
1679 /* Store the ace_flag. */
1680 current_ace->ace_flags = psa->flags;
1681
1682 /*
1683 * Now add the created ace to either the file list, the directory
1684 * list, or both. We *MUST* preserve the order here (hence we use
1685 * DLIST_ADD_END) as NT ACLs are order dependent.
1686 */
1687
1688 if (fsp->is_directory) {
1689
1690 /*
1691 * We can only add to the default POSIX ACE list if the ACE is
1692 * designed to be inherited by both files and directories.
1693 */
1694
1695 if ((psa->flags & (SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT)) ==
1696 (SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT)) {
1697
1698 canon_ace *current_dir_ace = current_ace;
1699 DLIST_ADD_END(*dir_ace, current_ace, canon_ace *);
1700
1701 /*
1702 * Note if this was an allow ace. We can't process
1703 * any further deny ace's after this.
1704 */
1705
1706 if (current_ace->attr == ALLOW_ACE)
1707 *got_dir_allow = True;
1708
1709 if ((current_ace->attr == DENY_ACE) && *got_dir_allow) {
1710 DEBUG(0,("add_current_ace_to_acl: "
1711 "malformed ACL in "
1712 "inheritable ACL! Deny entry "
1713 "after Allow entry. Failing "
1714 "to set on file %s.\n",
1715 fsp_str_dbg(fsp)));
1716 return False;
1717 }
1718
1719 if( DEBUGLVL( 10 )) {
1720 dbgtext("add_current_ace_to_acl: adding dir ACL:\n");
1721 print_canon_ace( current_ace, 0);
1722 }
1723
1724 /*
1725 * If this is not an inherit only ACE we need to add a duplicate
1726 * to the file acl.
1727 */
1728
1729 if (!(psa->flags & SEC_ACE_FLAG_INHERIT_ONLY)) {
1730 canon_ace *dup_ace = dup_canon_ace(current_ace);
1731
1732 if (!dup_ace) {
1733 DEBUG(0,("add_current_ace_to_acl: malloc fail !\n"));
1734 return False;
1735 }
1736
1737 /*
1738 * We must not free current_ace here as its
1739 * pointer is now owned by the dir_ace list.
1740 */
1741 current_ace = dup_ace;
1742 /* We've essentially split this ace into two,
1743 * and added the ace with inheritance request
1744 * bits to the directory ACL. Drop those bits for
1745 * the ACE we're adding to the file list. */
1746 current_ace->ace_flags &= ~(SEC_ACE_FLAG_OBJECT_INHERIT|
1747 SEC_ACE_FLAG_CONTAINER_INHERIT|
1748 SEC_ACE_FLAG_INHERIT_ONLY);
1749 } else {
1750 /*
1751 * We must not free current_ace here as its
1752 * pointer is now owned by the dir_ace list.
1753 */
1754 current_ace = NULL;
1755 }
1756
1757 /*
1758 * current_ace is now either owned by file_ace
1759 * or is NULL. We can safely operate on current_dir_ace
1760 * to treat mapping for default acl entries differently
1761 * than access acl entries.
1762 */
1763
1764 if (current_dir_ace->owner_type == UID_ACE) {
1765 /*
1766 * We already decided above this is a uid,
1767 * for default acls ace's only CREATOR_OWNER
1768 * maps to ACL_USER_OBJ. All other uid
1769 * ace's are ACL_USER.
1770 */
1771 if (dom_sid_equal(&current_dir_ace->trustee,
1772 &global_sid_Creator_Owner)) {
1773 current_dir_ace->type = SMB_ACL_USER_OBJ;
1774 } else {
1775 current_dir_ace->type = SMB_ACL_USER;
1776 }
1777 }
1778
1779 if (current_dir_ace->owner_type == GID_ACE) {
1780 /*
1781 * We already decided above this is a gid,
1782 * for default acls ace's only CREATOR_GROUP
1783 * maps to ACL_GROUP_OBJ. All other uid
1784 * ace's are ACL_GROUP.
1785 */
1786 if (dom_sid_equal(&current_dir_ace->trustee,
1787 &global_sid_Creator_Group)) {
1788 current_dir_ace->type = SMB_ACL_GROUP_OBJ;
1789 } else {
1790 current_dir_ace->type = SMB_ACL_GROUP;
1791 }
1792 }
1793 }
1794 }
1795
1796 /*
1797 * Only add to the file ACL if not inherit only.
1798 */
1799
1800 if (current_ace && !(psa->flags & SEC_ACE_FLAG_INHERIT_ONLY)) {
1801 DLIST_ADD_END(*file_ace, current_ace, canon_ace *);
1802
1803 /*
1804 * Note if this was an allow ace. We can't process
1805 * any further deny ace's after this.
1806 */
1807
1808 if (current_ace->attr == ALLOW_ACE)
1809 *got_file_allow = True;
1810
1811 if ((current_ace->attr == DENY_ACE) && *got_file_allow) {
1812 DEBUG(0,("add_current_ace_to_acl: malformed "
1813 "ACL in file ACL ! Deny entry after "
1814 "Allow entry. Failing to set on file "
1815 "%s.\n", fsp_str_dbg(fsp)));
1816 return False;
1817 }
1818
1819 if( DEBUGLVL( 10 )) {
1820 dbgtext("add_current_ace_to_acl: adding file ACL:\n");
1821 print_canon_ace( current_ace, 0);
1822 }
1823 *all_aces_are_inherit_only = False;
1824 /*
1825 * We must not free current_ace here as its
1826 * pointer is now owned by the file_ace list.
1827 */
1828 current_ace = NULL;
1829 }
1830
1831 /*
1832 * Free if ACE was not added.
1833 */
1834
1835 TALLOC_FREE(current_ace);
1836 return true;
1837 }
1838
1839 /****************************************************************************
1840 Unpack a struct security_descriptor into two canonical ace lists.
1841 ****************************************************************************/
1842
1843 static bool create_canon_ace_lists(files_struct *fsp,
1844 const SMB_STRUCT_STAT *pst,
1845 struct dom_sid *pfile_owner_sid,
1846 struct dom_sid *pfile_grp_sid,
1847 canon_ace **ppfile_ace,
1848 canon_ace **ppdir_ace,
1849 const struct security_acl *dacl)
1850 {
1851 bool all_aces_are_inherit_only = (fsp->is_directory ? True : False);
1852 canon_ace *file_ace = NULL;
1853 canon_ace *dir_ace = NULL;
1854 canon_ace *current_ace = NULL;
1855 bool got_dir_allow = False;
1856 bool got_file_allow = False;
1857 int i, j;
1858
1859 *ppfile_ace = NULL;
1860 *ppdir_ace = NULL;
1861
1862 /*
1863 * Convert the incoming ACL into a more regular form.
1864 */
1865
1866 for(i = 0; i < dacl->num_aces; i++) {
1867 struct security_ace *psa = &dacl->aces[i];
1868
1869 if((psa->type != SEC_ACE_TYPE_ACCESS_ALLOWED) && (psa->type != SEC_ACE_TYPE_ACCESS_DENIED)) {
1870 DEBUG(3,("create_canon_ace_lists: unable to set anything but an ALLOW or DENY ACE.\n"));
1871 return False;
1872 }
1873 }
1874
1875 /*
1876 * Deal with the fact that NT 4.x re-writes the canonical format
1877 * that we return for default ACLs. If a directory ACE is identical
1878 * to a inherited directory ACE then NT changes the bits so that the
1879 * first ACE is set to OI|IO and the second ACE for this SID is set
1880 * to CI. We need to repair this. JRA.
1881 */
1882
1883 for(i = 0; i < dacl->num_aces; i++) {
1884 struct security_ace *psa1 = &dacl->aces[i];
1885
1886 for (j = i + 1; j < dacl->num_aces; j++) {
1887 struct security_ace *psa2 = &dacl->aces[j];
1888
1889 if (psa1->access_mask != psa2->access_mask)
1890 continue;
1891
1892 if (!dom_sid_equal(&psa1->trustee, &psa2->trustee))
1893 continue;
1894
1895 /*
1896 * Ok - permission bits and SIDs are equal.
1897 * Check if flags were re-written.
1898 */
1899
1900 if (psa1->flags & SEC_ACE_FLAG_INHERIT_ONLY) {
1901
1902 psa1->flags |= (psa2->flags & (SEC_ACE_FLAG_CONTAINER_INHERIT|SEC_ACE_FLAG_OBJECT_INHERIT));
1903 psa2->flags &= ~(SEC_ACE_FLAG_CONTAINER_INHERIT|SEC_ACE_FLAG_OBJECT_INHERIT);
1904
1905 } else if (psa2->flags & SEC_ACE_FLAG_INHERIT_ONLY) {
1906
1907 psa2->flags |= (psa1->flags & (SEC_ACE_FLAG_CONTAINER_INHERIT|SEC_ACE_FLAG_OBJECT_INHERIT));
1908 psa1->flags &= ~(SEC_ACE_FLAG_CONTAINER_INHERIT|SEC_ACE_FLAG_OBJECT_INHERIT);
1909
1910 }
1911 }
1912 }
1913
1914 for(i = 0; i < dacl->num_aces; i++) {
1915 struct security_ace *psa = &dacl->aces[i];
1916
1917 /*
1918 * Create a canon_ace entry representing this NT DACL ACE.
1919 */
1920
1921 if ((current_ace = talloc(talloc_tos(), canon_ace)) == NULL) {
1922 free_canon_ace_list(file_ace);
1923 free_canon_ace_list(dir_ace);
1924 DEBUG(0,("create_canon_ace_lists: malloc fail.\n"));
1925 return False;
1926 }
1927
1928 ZERO_STRUCTP(current_ace);
1929
1930 sid_copy(&current_ace->trustee, &psa->trustee);
1931
1932 /*
1933 * Try and work out if the SID is a user or group
1934 * as we need to flag these differently for POSIX.
1935 * Note what kind of a POSIX ACL this should map to.
1936 */
1937
1938 if( dom_sid_equal(&current_ace->trustee, &global_sid_World)) {
1939 current_ace->owner_type = WORLD_ACE;
1940 current_ace->unix_ug.type = ID_TYPE_NOT_SPECIFIED;
1941 current_ace->unix_ug.id = -1;
1942 current_ace->type = SMB_ACL_OTHER;
1943 } else if (dom_sid_equal(&current_ace->trustee, &global_sid_Creator_Owner)) {
1944 current_ace->owner_type = UID_ACE;
1945 current_ace->unix_ug.type = ID_TYPE_UID;
1946 current_ace->unix_ug.id = pst->st_ex_uid;
1947 current_ace->type = SMB_ACL_USER_OBJ;
1948
1949 /*
1950 * The Creator Owner entry only specifies inheritable permissions,
1951 * never access permissions. WinNT doesn't always set the ACE to
1952 * INHERIT_ONLY, though.
1953 */
1954
1955 psa->flags |= SEC_ACE_FLAG_INHERIT_ONLY;
1956
1957 } else if (dom_sid_equal(&current_ace->trustee, &global_sid_Creator_Group)) {
1958 current_ace->owner_type = GID_ACE;
1959 current_ace->unix_ug.type = ID_TYPE_GID;
1960 current_ace->unix_ug.id = pst->st_ex_gid;
1961 current_ace->type = SMB_ACL_GROUP_OBJ;
1962
1963 /*
1964 * The Creator Group entry only specifies inheritable permissions,
1965 * never access permissions. WinNT doesn't always set the ACE to
1966 * INHERIT_ONLY, though.
1967 */
1968 psa->flags |= SEC_ACE_FLAG_INHERIT_ONLY;
1969
1970 } else {
1971 struct unixid unixid;
1972
1973 if (!sids_to_unixids(&current_ace->trustee, 1, &unixid)) {
1974 free_canon_ace_list(file_ace);
1975 free_canon_ace_list(dir_ace);
1976 TALLOC_FREE(current_ace);
1977 DEBUG(0, ("create_canon_ace_lists: sids_to_unixids "
1978 "failed for %s (allocation failure)\n",
1979 sid_string_dbg(&current_ace->trustee)));
1980 return false;
1981 }
1982
1983 if (unixid.type == ID_TYPE_BOTH) {
1984 /*
1985 * We must add both a user and group
1986 * entry POSIX_ACL.
1987 * This is due to the fact that in POSIX
1988 * user entries are more specific than
1989 * groups.
1990 */
1991 current_ace->owner_type = UID_ACE;
1992 current_ace->unix_ug.type = ID_TYPE_UID;
1993 current_ace->unix_ug.id = unixid.id;
1994 current_ace->type =
1995 (unixid.id == pst->st_ex_uid) ?
1996 SMB_ACL_USER_OBJ :
1997 SMB_ACL_USER;
1998
1999 /* Add the user object to the posix ACL,
2000 and proceed to the group mapping
2001 below. This handles the talloc_free
2002 of current_ace if not added for some
2003 reason */
2004 if (!add_current_ace_to_acl(fsp,
2005 psa,
2006 &file_ace,
2007 &dir_ace,
2008 &got_file_allow,
2009 &got_dir_allow,
2010 &all_aces_are_inherit_only,
2011 current_ace)) {
2012 free_canon_ace_list(file_ace);
2013 free_canon_ace_list(dir_ace);
2014 return false;
2015 }
2016
2017 if ((current_ace = talloc(talloc_tos(),
2018 canon_ace)) == NULL) {
2019 free_canon_ace_list(file_ace);
2020 free_canon_ace_list(dir_ace);
2021 DEBUG(0,("create_canon_ace_lists: "
2022 "malloc fail.\n"));
2023 return False;
2024 }
2025
2026 ZERO_STRUCTP(current_ace);
2027
2028 sid_copy(&current_ace->trustee, &psa->trustee);
2029
2030 current_ace->unix_ug.type = ID_TYPE_GID;
2031 current_ace->unix_ug.id = unixid.id;
2032 current_ace->owner_type = GID_ACE;
2033 /* If it's the primary group, this is a
2034 group_obj, not a group. */
2035 if (current_ace->unix_ug.id == pst->st_ex_gid) {
2036 current_ace->type = SMB_ACL_GROUP_OBJ;
2037 } else {
2038 current_ace->type = SMB_ACL_GROUP;
2039 }
2040
2041 } else if (unixid.type == ID_TYPE_UID) {
2042 current_ace->owner_type = UID_ACE;
2043 current_ace->unix_ug.type = ID_TYPE_UID;
2044 current_ace->unix_ug.id = unixid.id;
2045 /* If it's the owning user, this is a user_obj,
2046 not a user. */
2047 if (current_ace->unix_ug.id == pst->st_ex_uid) {
2048 current_ace->type = SMB_ACL_USER_OBJ;
2049 } else {
2050 current_ace->type = SMB_ACL_USER;
2051 }
2052 } else if (unixid.type == ID_TYPE_GID) {
2053 current_ace->unix_ug.type = ID_TYPE_GID;
2054 current_ace->unix_ug.id = unixid.id;
2055 current_ace->owner_type = GID_ACE;
2056 /* If it's the primary group, this is a
2057 group_obj, not a group. */
2058 if (current_ace->unix_ug.id == pst->st_ex_gid) {
2059 current_ace->type = SMB_ACL_GROUP_OBJ;
2060 } else {
2061 current_ace->type = SMB_ACL_GROUP;
2062 }
2063 } else {
2064 /*
2065 * Silently ignore map failures in non-mappable SIDs (NT Authority, BUILTIN etc).
2066 */
2067
2068 if (non_mappable_sid(&psa->trustee)) {
2069 DEBUG(10, ("create_canon_ace_lists: ignoring "
2070 "non-mappable SID %s\n",
2071 sid_string_dbg(&psa->trustee)));
2072 TALLOC_FREE(current_ace);
2073 continue;
2074 }
2075
2076 if (lp_force_unknown_acl_user(SNUM(fsp->conn))) {
2077 DEBUG(10, ("create_canon_ace_lists: ignoring "
2078 "unknown or foreign SID %s\n",
2079 sid_string_dbg(&psa->trustee)));
2080 TALLOC_FREE(current_ace);
2081 continue;
2082 }
2083
2084 free_canon_ace_list(file_ace);
2085 free_canon_ace_list(dir_ace);
2086 DEBUG(0, ("create_canon_ace_lists: unable to map SID "
2087 "%s to uid or gid.\n",
2088 sid_string_dbg(&current_ace->trustee)));
2089 TALLOC_FREE(current_ace);
2090 return false;
2091 }
2092 }
2093
2094 /* handles the talloc_free of current_ace if not added for some reason */
2095 if (!add_current_ace_to_acl(fsp, psa, &file_ace, &dir_ace,
2096 &got_file_allow, &got_dir_allow,
2097 &all_aces_are_inherit_only, current_ace)) {
2098 free_canon_ace_list(file_ace);
2099 free_canon_ace_list(dir_ace);
2100 return false;
2101 }
2102 }
2103
2104 if (fsp->is_directory && all_aces_are_inherit_only) {
2105 /*
2106 * Windows 2000 is doing one of these weird 'inherit acl'
2107 * traverses to conserve NTFS ACL resources. Just pretend
2108 * there was no DACL sent. JRA.
2109 */
2110
2111 DEBUG(10,("create_canon_ace_lists: Win2k inherit acl traverse. Ignoring DACL.\n"));
2112 free_canon_ace_list(file_ace);
2113 free_canon_ace_list(dir_ace);
2114 file_ace = NULL;
2115 dir_ace = NULL;
2116 } else {
2117 /*
2118 * Check if we have SMB_ACL_USER_OBJ and SMB_ACL_GROUP_OBJ entries in
2119 * the file ACL. If we don't have them, check if any SMB_ACL_USER/SMB_ACL_GROUP
2120 * entries can be converted to *_OBJ. Don't do this for the default
2121 * ACL, we will create them separately for this if needed inside
2122 * ensure_canon_entry_valid_on_set().
2123 */
2124 if (file_ace) {
2125 check_owning_objs(file_ace, pfile_owner_sid, pfile_grp_sid);
2126 }
2127 }
2128
2129 *ppfile_ace = file_ace;
2130 *ppdir_ace = dir_ace;
2131
2132 return True;
2133 }
2134
2135 /****************************************************************************
2136 ASCII art time again... JRA :-).
2137
2138 We have 4 cases to process when moving from an NT ACL to a POSIX ACL. Firstly,
2139 we insist the ACL is in canonical form (ie. all DENY entries preceede ALLOW
2140 entries). Secondly, the merge code has ensured that all duplicate SID entries for
2141 allow or deny have been merged, so the same SID can only appear once in the deny
2142 list or once in the allow list.
2143
2144 We then process as follows :
2145
2146 ---------------------------------------------------------------------------
2147 First pass - look for a Everyone DENY entry.
2148
2149 If it is deny all (rwx) trunate the list at this point.
2150 Else, walk the list from this point and use the deny permissions of this
2151 entry as a mask on all following allow entries. Finally, delete
2152 the Everyone DENY entry (we have applied it to everything possible).
2153
2154 In addition, in this pass we remove any DENY entries that have
2155 no permissions (ie. they are a DENY nothing).
2156 ---------------------------------------------------------------------------
2157 Second pass - only deal with deny user entries.
2158
2159 DENY user1 (perms XXX)
2160
2161 new_perms = 0
2162 for all following allow group entries where user1 is in group
2163 new_perms |= group_perms;
2164
2165 user1 entry perms = new_perms & ~ XXX;
2166
2167 Convert the deny entry to an allow entry with the new perms and
2168 push to the end of the list. Note if the user was in no groups
2169 this maps to a specific allow nothing entry for this user.
2170
2171 The common case from the NT ACL choser (userX deny all) is
2172 optimised so we don't do the group lookup - we just map to
2173 an allow nothing entry.
2174
2175 What we're doing here is inferring the allow permissions the
2176 person setting the ACE on user1 wanted by looking at the allow
2177 permissions on the groups the user is currently in. This will
2178 be a snapshot, depending on group membership but is the best
2179 we can do and has the advantage of failing closed rather than
2180 open.
2181 ---------------------------------------------------------------------------
2182 Third pass - only deal with deny group entries.
2183
2184 DENY group1 (perms XXX)
2185
2186 for all following allow user entries where user is in group1
2187 user entry perms = user entry perms & ~ XXX;
2188
2189 If there is a group Everyone allow entry with permissions YYY,
2190 convert the group1 entry to an allow entry and modify its
2191 permissions to be :
2192
2193 new_perms = YYY & ~ XXX
2194
2195 and push to the end of the list.
2196
2197 If there is no group Everyone allow entry then convert the
2198 group1 entry to a allow nothing entry and push to the end of the list.
2199
2200 Note that the common case from the NT ACL choser (groupX deny all)
2201 cannot be optimised here as we need to modify user entries who are
2202 in the group to change them to a deny all also.
2203
2204 What we're doing here is modifying the allow permissions of
2205 user entries (which are more specific in POSIX ACLs) to mask
2206 out the explicit deny set on the group they are in. This will
2207 be a snapshot depending on current group membership but is the
2208 best we can do and has the advantage of failing closed rather
2209 than open.
2210 ---------------------------------------------------------------------------
2211 Fourth pass - cope with cumulative permissions.
2212
2213 for all allow user entries, if there exists an allow group entry with
2214 more permissive permissions, and the user is in that group, rewrite the
2215 allow user permissions to contain both sets of permissions.
2216
2217 Currently the code for this is #ifdef'ed out as these semantics make
2218 no sense to me. JRA.
2219 ---------------------------------------------------------------------------
2220
2221 Note we *MUST* do the deny user pass first as this will convert deny user
2222 entries into allow user entries which can then be processed by the deny
2223 group pass.
2224
2225 The above algorithm took a *lot* of thinking about - hence this
2226 explaination :-). JRA.
2227 ****************************************************************************/
2228
2229 /****************************************************************************
2230 Process a canon_ace list entries. This is very complex code. We need
2231 to go through and remove the "deny" permissions from any allow entry that matches
2232 the id of this entry. We have already refused any NT ACL that wasn't in correct
2233 order (DENY followed by ALLOW). If any allow entry ends up with zero permissions,
2234 we just remove it (to fail safe). We have already removed any duplicate ace
2235 entries. Treat an "Everyone" DENY_ACE as a special case - use it to mask all
2236 allow entries.
2237 ****************************************************************************/
2238
2239 static void process_deny_list(connection_struct *conn, canon_ace **pp_ace_list )
2240 {
2241 canon_ace *ace_list = *pp_ace_list;
2242 canon_ace *curr_ace = NULL;
2243 canon_ace *curr_ace_next = NULL;
2244
2245 /* Pass 1 above - look for an Everyone, deny entry. */
2246
2247 for (curr_ace = ace_list; curr_ace; curr_ace = curr_ace_next) {
2248 canon_ace *allow_ace_p;
2249
2250 curr_ace_next = curr_ace->next; /* So we can't lose the link. */
2251
2252 if (curr_ace->attr != DENY_ACE)
2253 continue;
2254
2255 if (curr_ace->perms == (mode_t)0) {
2256
2257 /* Deny nothing entry - delete. */
2258
2259 DLIST_REMOVE(ace_list, curr_ace);
2260 continue;
2261 }
2262
2263 if (!dom_sid_equal(&curr_ace->trustee, &global_sid_World))
2264 continue;
2265
2266 /* JRATEST - assert. */
2267 SMB_ASSERT(curr_ace->owner_type == WORLD_ACE);
2268
2269 if (curr_ace->perms == ALL_ACE_PERMS) {
2270
2271 /*
2272 * Optimisation. This is a DENY_ALL to Everyone. Truncate the
2273 * list at this point including this entry.
2274 */
2275
2276 canon_ace *prev_entry = DLIST_PREV(curr_ace);
2277
2278 free_canon_ace_list( curr_ace );
2279 if (prev_entry)
2280 DLIST_REMOVE(ace_list, prev_entry);
2281 else {
2282 /* We deleted the entire list. */
2283 ace_list = NULL;
2284 }
2285 break;
2286 }
2287
2288 for (allow_ace_p = curr_ace->next; allow_ace_p; allow_ace_p = allow_ace_p->next) {
2289
2290 /*
2291 * Only mask off allow entries.
2292 */
2293
2294 if (allow_ace_p->attr != ALLOW_ACE)
2295 continue;
2296
2297 allow_ace_p->perms &= ~curr_ace->perms;
2298 }
2299
2300 /*
2301 * Now it's been applied, remove it.
2302 */
2303
2304 DLIST_REMOVE(ace_list, curr_ace);
2305 }
2306
2307 /* Pass 2 above - deal with deny user entries. */
2308
2309 for (curr_ace = ace_list; curr_ace; curr_ace = curr_ace_next) {
2310 mode_t new_perms = (mode_t)0;
2311 canon_ace *allow_ace_p;
2312
2313 curr_ace_next = curr_ace->next; /* So we can't lose the link. */
2314
2315 if (curr_ace->attr != DENY_ACE)
2316 continue;
2317
2318 if (curr_ace->owner_type != UID_ACE)
2319 continue;
2320
2321 if (curr_ace->perms == ALL_ACE_PERMS) {
2322
2323 /*
2324 * Optimisation - this is a deny everything to this user.
2325 * Convert to an allow nothing and push to the end of the list.
2326 */
2327
2328 curr_ace->attr = ALLOW_ACE;
2329 curr_ace->perms = (mode_t)0;
2330 DLIST_DEMOTE(ace_list, curr_ace, canon_ace *);
2331 continue;
2332 }
2333
2334 for (allow_ace_p = curr_ace->next; allow_ace_p; allow_ace_p = allow_ace_p->next) {
2335
2336 if (allow_ace_p->attr != ALLOW_ACE)
2337 continue;
2338
2339 /* We process GID_ACE and WORLD_ACE entries only. */
2340
2341 if (allow_ace_p->owner_type == UID_ACE)
2342 continue;
2343
2344 if (uid_entry_in_group(conn, curr_ace, allow_ace_p))
2345 new_perms |= allow_ace_p->perms;
2346 }
2347
2348 /*
2349 * Convert to a allow entry, modify the perms and push to the end
2350 * of the list.
2351 */
2352
2353 curr_ace->attr = ALLOW_ACE;
2354 curr_ace->perms = (new_perms & ~curr_ace->perms);
2355 DLIST_DEMOTE(ace_list, curr_ace, canon_ace *);
2356 }
2357
2358 /* Pass 3 above - deal with deny group entries. */
2359
2360 for (curr_ace = ace_list; curr_ace; curr_ace = curr_ace_next) {
2361 canon_ace *allow_ace_p;
2362 canon_ace *allow_everyone_p = NULL;
2363
2364 curr_ace_next = curr_ace->next; /* So we can't lose the link. */
2365
2366 if (curr_ace->attr != DENY_ACE)
2367 continue;
2368
2369 if (curr_ace->owner_type != GID_ACE)
2370 continue;
2371
2372 for (allow_ace_p = curr_ace->next; allow_ace_p; allow_ace_p = allow_ace_p->next) {
2373
2374 if (allow_ace_p->attr != ALLOW_ACE)
2375 continue;
2376
2377 /* Store a pointer to the Everyone allow, if it exists. */
2378 if (allow_ace_p->owner_type == WORLD_ACE)
2379 allow_everyone_p = allow_ace_p;
2380
2381 /* We process UID_ACE entries only. */
2382
2383 if (allow_ace_p->owner_type != UID_ACE)
2384 continue;
2385
2386 /* Mask off the deny group perms. */
2387
2388 if (uid_entry_in_group(conn, allow_ace_p, curr_ace))
2389 allow_ace_p->perms &= ~curr_ace->perms;
2390 }
2391
2392 /*
2393 * Convert the deny to an allow with the correct perms and
2394 * push to the end of the list.
2395 */
2396
2397 curr_ace->attr = ALLOW_ACE;
2398 if (allow_everyone_p)
2399 curr_ace->perms = allow_everyone_p->perms & ~curr_ace->perms;
2400 else
2401 curr_ace->perms = (mode_t)0;
2402 DLIST_DEMOTE(ace_list, curr_ace, canon_ace *);
2403 }
2404
2405 /* Doing this fourth pass allows Windows semantics to be layered
2406 * on top of POSIX semantics. I'm not sure if this is desirable.
2407 * For example, in W2K ACLs there is no way to say, "Group X no
2408 * access, user Y full access" if user Y is a member of group X.
2409 * This seems completely broken semantics to me.... JRA.
2410 */
2411
2412 #if 0
2413 /* Pass 4 above - deal with allow entries. */
2414
2415 for (curr_ace = ace_list; curr_ace; curr_ace = curr_ace_next) {
2416 canon_ace *allow_ace_p;
2417
2418 curr_ace_next = curr_ace->next; /* So we can't lose the link. */
2419
2420 if (curr_ace->attr != ALLOW_ACE)
2421 continue;
2422
2423 if (curr_ace->owner_type != UID_ACE)
2424 continue;
2425
2426 for (allow_ace_p = ace_list; allow_ace_p; allow_ace_p = allow_ace_p->next) {
2427
2428 if (allow_ace_p->attr != ALLOW_ACE)
2429 continue;
2430
2431 /* We process GID_ACE entries only. */
2432
2433 if (allow_ace_p->owner_type != GID_ACE)
2434 continue;
2435
2436 /* OR in the group perms. */
2437
2438 if (uid_entry_in_group(conn, curr_ace, allow_ace_p))
2439 curr_ace->perms |= allow_ace_p->perms;
2440 }
2441 }
2442 #endif
2443
2444 *pp_ace_list = ace_list;
2445 }
2446
2447 /****************************************************************************
2448 Unpack a struct security_descriptor into two canonical ace lists. We don't depend on this
2449 succeeding.
2450 ****************************************************************************/
2451
2452 static bool unpack_canon_ace(files_struct *fsp,
2453 const SMB_STRUCT_STAT *pst,
2454 struct dom_sid *pfile_owner_sid,
2455 struct dom_sid *pfile_grp_sid,
2456 canon_ace **ppfile_ace,
2457 canon_ace **ppdir_ace,
2458 uint32 security_info_sent,
2459 const struct security_descriptor *psd)
2460 {
2461 canon_ace *file_ace = NULL;
2462 canon_ace *dir_ace = NULL;
2463
2464 *ppfile_ace = NULL;
2465 *ppdir_ace = NULL;
2466
2467 if(security_info_sent == 0) {
2468 DEBUG(0,("unpack_canon_ace: no security info sent !\n"));
2469 return False;
2470 }
2471
2472 /*
2473 * If no DACL then this is a chown only security descriptor.
2474 */
2475
2476 if(!(security_info_sent & SECINFO_DACL) || !psd->dacl)
2477 return True;
2478
2479 /*
2480 * Now go through the DACL and create the canon_ace lists.
2481 */
2482
2483 if (!create_canon_ace_lists( fsp, pst, pfile_owner_sid, pfile_grp_sid,
2484 &file_ace, &dir_ace, psd->dacl))
2485 return False;
2486
2487 if ((file_ace == NULL) && (dir_ace == NULL)) {
2488 /* W2K traverse DACL set - ignore. */
2489 return True;
2490 }
2491
2492 /*
2493 * Go through the canon_ace list and merge entries
2494 * belonging to identical users of identical allow or deny type.
2495 * We can do this as all deny entries come first, followed by
2496 * all allow entries (we have mandated this before accepting this acl).
2497 */
2498
2499 print_canon_ace_list( "file ace - before merge", file_ace);
2500 merge_aces( &file_ace, false);
2501
2502 print_canon_ace_list( "dir ace - before merge", dir_ace);
2503 merge_aces( &dir_ace, true);
2504
2505 /*
2506 * NT ACLs are order dependent. Go through the acl lists and
2507 * process DENY entries by masking the allow entries.
2508 */
2509
2510 print_canon_ace_list( "file ace - before deny", file_ace);
2511 process_deny_list(fsp->conn, &file_ace);
2512
2513 print_canon_ace_list( "dir ace - before deny", dir_ace);
2514 process_deny_list(fsp->conn, &dir_ace);
2515
2516 /*
2517 * A well formed POSIX file or default ACL has at least 3 entries, a
2518 * SMB_ACL_USER_OBJ, SMB_ACL_GROUP_OBJ, SMB_ACL_OTHER_OBJ
2519 * and optionally a mask entry. Ensure this is the case.
2520 */
2521
2522 print_canon_ace_list( "file ace - before valid", file_ace);
2523
2524 if (!ensure_canon_entry_valid_on_set(fsp->conn, &file_ace, false, fsp->conn->params,
2525 fsp->is_directory, pfile_owner_sid, pfile_grp_sid, pst)) {
2526 free_canon_ace_list(file_ace);
2527 free_canon_ace_list(dir_ace);
2528 return False;
2529 }
2530
2531 print_canon_ace_list( "dir ace - before valid", dir_ace);
2532
2533 if (dir_ace && !ensure_canon_entry_valid_on_set(fsp->conn, &dir_ace, true, fsp->conn->params,
2534 fsp->is_directory, pfile_owner_sid, pfile_grp_sid, pst)) {
2535 free_canon_ace_list(file_ace);
2536 free_canon_ace_list(dir_ace);
2537 return False;
2538 }
2539
2540 print_canon_ace_list( "file ace - return", file_ace);
2541 print_canon_ace_list( "dir ace - return", dir_ace);
2542
2543 *ppfile_ace = file_ace;
2544 *ppdir_ace = dir_ace;
2545 return True;
2546
2547 }
2548
2549 /******************************************************************************
2550 When returning permissions, try and fit NT display
2551 semantics if possible. Note the the canon_entries here must have been malloced.
2552 The list format should be - first entry = owner, followed by group and other user
2553 entries, last entry = other.
2554
2555 Note that this doesn't exactly match the NT semantics for an ACL. As POSIX entries
2556 are not ordered, and match on the most specific entry rather than walking a list,
2557 then a simple POSIX permission of rw-r--r-- should really map to 5 entries,
2558
2559 Entry 0: owner : deny all except read and write.
2560 Entry 1: owner : allow read and write.
2561 Entry 2: group : deny all except read.
2562 Entry 3: group : allow read.
2563 Entry 4: Everyone : allow read.
2564
2565 But NT cannot display this in their ACL editor !
2566 ********************************************************************************/
2567
2568 static void arrange_posix_perms(const char *filename, canon_ace **pp_list_head)
2569 {
2570 canon_ace *l_head = *pp_list_head;
2571 canon_ace *owner_ace = NULL;
2572 canon_ace *other_ace = NULL;
2573 canon_ace *ace = NULL;
2574
2575 for (ace = l_head; ace; ace = ace->next) {
2576 if (ace->type == SMB_ACL_USER_OBJ)
2577 owner_ace = ace;
2578 else if (ace->type == SMB_ACL_OTHER) {
2579 /* Last ace - this is "other" */
2580 other_ace = ace;
2581 }
2582 }
2583
2584 if (!owner_ace || !other_ace) {
2585 DEBUG(0,("arrange_posix_perms: Invalid POSIX permissions for file %s, missing owner or other.\n",
2586 filename ));
2587 return;
2588 }
2589
2590 /*
2591 * The POSIX algorithm applies to owner first, and other last,
2592 * so ensure they are arranged in this order.
2593 */
2594
2595 if (owner_ace) {
2596 DLIST_PROMOTE(l_head, owner_ace);
2597 }
2598
2599 if (other_ace) {
2600 DLIST_DEMOTE(l_head, other_ace, canon_ace *);
2601 }
2602
2603 /* We have probably changed the head of the list. */
2604
2605 *pp_list_head = l_head;
2606 }
2607
2608 /****************************************************************************
2609 Create a linked list of canonical ACE entries.
2610 ****************************************************************************/
2611
2612 static canon_ace *canonicalise_acl(struct connection_struct *conn,
2613 const char *fname, SMB_ACL_T posix_acl,
2614 const SMB_STRUCT_STAT *psbuf,
2615 const struct dom_sid *powner, const struct dom_sid *pgroup, struct pai_val *pal, SMB_ACL_TYPE_T the_acl_type)
2616 {
2617 mode_t acl_mask = (S_IRUSR|S_IWUSR|S_IXUSR);
2618 canon_ace *l_head = NULL;
2619 canon_ace *ace = NULL;
2620 canon_ace *next_ace = NULL;
2621 int entry_id = SMB_ACL_FIRST_ENTRY;
2622 bool is_default_acl = (the_acl_type == SMB_ACL_TYPE_DEFAULT);
2623 SMB_ACL_ENTRY_T entry;
2624 size_t ace_count;
2625
2626 while ( posix_acl && (sys_acl_get_entry(posix_acl, entry_id, &entry) == 1)) {
2627 SMB_ACL_TAG_T tagtype;
2628 SMB_ACL_PERMSET_T permset;
2629 struct dom_sid sid;
2630 struct unixid unix_ug;
2631 enum ace_owner owner_type;
2632
2633 entry_id = SMB_ACL_NEXT_ENTRY;
2634
2635 /* Is this a MASK entry ? */
2636 if (sys_acl_get_tag_type(entry, &tagtype) == -1)
2637 continue;
2638
2639 if (sys_acl_get_permset(entry, &permset) == -1)
2640 continue;
2641
2642 /* Decide which SID to use based on the ACL type. */
2643 switch(tagtype) {
2644 case SMB_ACL_USER_OBJ:
2645 /* Get the SID from the owner. */
2646 sid_copy(&sid, powner);
2647 unix_ug.type = ID_TYPE_UID;
2648 unix_ug.id = psbuf->st_ex_uid;
2649 owner_type = UID_ACE;
2650 break;
2651 case SMB_ACL_USER:
2652 {
2653 uid_t *puid = (uid_t *)sys_acl_get_qualifier(entry);
2654 if (puid == NULL) {
2655 DEBUG(0,("canonicalise_acl: Failed to get uid.\n"));
2656 continue;
2657 }
2658 uid_to_sid( &sid, *puid);
2659 unix_ug.type = ID_TYPE_UID;
2660 unix_ug.id = *puid;
2661 owner_type = UID_ACE;
2662 break;
2663 }
2664 case SMB_ACL_GROUP_OBJ:
2665 /* Get the SID from the owning group. */
2666 sid_copy(&sid, pgroup);
2667 unix_ug.type = ID_TYPE_GID;
2668 unix_ug.id = psbuf->st_ex_gid;
2669 owner_type = GID_ACE;
2670 break;
2671 case SMB_ACL_GROUP:
2672 {
2673 gid_t *pgid = (gid_t *)sys_acl_get_qualifier(entry);
2674 if (pgid == NULL) {
2675 DEBUG(0,("canonicalise_acl: Failed to get gid.\n"));
2676 continue;
2677 }
2678 gid_to_sid( &sid, *pgid);
2679 unix_ug.type = ID_TYPE_GID;
2680 unix_ug.id = *pgid;
2681 owner_type = GID_ACE;
2682 break;
2683 }
2684 case SMB_ACL_MASK:
2685 acl_mask = convert_permset_to_mode_t(permset);
2686 continue; /* Don't count the mask as an entry. */
2687 case SMB_ACL_OTHER:
2688 /* Use the Everyone SID */
2689 sid = global_sid_World;
2690 unix_ug.type = ID_TYPE_NOT_SPECIFIED;
2691 unix_ug.id = -1;
2692 owner_type = WORLD_ACE;
2693 break;
2694 default:
2695 DEBUG(0,("canonicalise_acl: Unknown tagtype %u\n", (unsigned int)tagtype));
2696 continue;
2697 }
2698
2699 /*
2700 * Add this entry to the list.
2701 */
2702
2703 if ((ace = talloc(talloc_tos(), canon_ace)) == NULL)
2704 goto fail;
2705
2706 ZERO_STRUCTP(ace);
2707 ace->type = tagtype;
2708 ace->perms = convert_permset_to_mode_t(permset);
2709 ace->attr = ALLOW_ACE;
2710 ace->trustee = sid;
2711 ace->unix_ug = unix_ug;
2712 ace->owner_type = owner_type;
2713 ace->ace_flags = get_pai_flags(pal, ace, is_default_acl);
2714
2715 DLIST_ADD(l_head, ace);
2716 }
2717
2718 /*
2719 * This next call will ensure we have at least a user/group/world set.
2720 */
2721
2722 if (!ensure_canon_entry_valid_on_get(conn, &l_head,
2723 powner, pgroup,
2724 psbuf))
2725 goto fail;
2726
2727 /*
2728 * Now go through the list, masking the permissions with the
2729 * acl_mask. Ensure all DENY Entries are at the start of the list.
2730 */
2731
2732 DEBUG(10,("canonicalise_acl: %s ace entries before arrange :\n", is_default_acl ? "Default" : "Access"));
2733
2734 for ( ace_count = 0, ace = l_head; ace; ace = next_ace, ace_count++) {
2735 next_ace = ace->next;
2736
2737 /* Masks are only applied to entries other than USER_OBJ and OTHER. */
2738 if (ace->type != SMB_ACL_OTHER && ace->type != SMB_ACL_USER_OBJ)
2739 ace->perms &= acl_mask;
2740
2741 if (ace->perms == 0) {
2742 DLIST_PROMOTE(l_head, ace);
2743 }
2744
2745 if( DEBUGLVL( 10 ) ) {
2746 print_canon_ace(ace, ace_count);
2747 }
2748 }
2749
2750 arrange_posix_perms(fname,&l_head );
2751
2752 print_canon_ace_list( "canonicalise_acl: ace entries after arrange", l_head );
2753
2754 return l_head;
2755
2756 fail:
2757
2758 free_canon_ace_list(l_head);
2759 return NULL;
2760 }
2761
2762 /****************************************************************************
2763 Check if the current user group list contains a given group.
2764 ****************************************************************************/
2765
2766 bool current_user_in_group(connection_struct *conn, gid_t gid)
2767 {
2768 int i;
2769 const struct security_unix_token *utok = get_current_utok(conn);
2770
2771 for (i = 0; i < utok->ngroups; i++) {
2772 if (utok->groups[i] == gid) {
2773 return True;
2774 }
2775 }
2776
2777 return False;
2778 }
2779
2780 /****************************************************************************
2781 Should we override a deny ? Check 'acl group control' and 'dos filemode'.
2782 ****************************************************************************/
2783
2784 static bool acl_group_override(connection_struct *conn,
2785 const struct smb_filename *smb_fname)
2786 {
2787 if ((errno != EPERM) && (errno != EACCES)) {
2788 return false;
2789 }
2790
2791 /* file primary group == user primary or supplementary group */
2792 if (lp_acl_group_control(SNUM(conn)) &&
2793 current_user_in_group(conn, smb_fname->st.st_ex_gid)) {
2794 return true;
2795 }
2796
2797 /* user has writeable permission */
2798 if (lp_dos_filemode(SNUM(conn)) &&
2799 can_write_to_file(conn, smb_fname)) {
2800 return true;
2801 }
2802
2803 return false;
2804 }
2805
2806 /****************************************************************************
2807 Attempt to apply an ACL to a file or directory.
2808 ****************************************************************************/
2809
2810 static bool set_canon_ace_list(files_struct *fsp,
2811 canon_ace *the_ace,
2812 bool default_ace,
2813 const SMB_STRUCT_STAT *psbuf,
2814 bool *pacl_set_support)
2815 {
2816 connection_struct *conn = fsp->conn;
2817 bool ret = False;
2818 SMB_ACL_T the_acl = sys_acl_init(talloc_tos());
2819 canon_ace *p_ace;
2820 int i;
2821 SMB_ACL_ENTRY_T mask_entry;
2822 bool got_mask_entry = False;
2823 SMB_ACL_PERMSET_T mask_permset;
2824 SMB_ACL_TYPE_T the_acl_type = (default_ace ? SMB_ACL_TYPE_DEFAULT : SMB_ACL_TYPE_ACCESS);
2825 bool needs_mask = False;
2826 mode_t mask_perms = 0;
2827
2828 /* Use the psbuf that was passed in. */
2829 if (psbuf != &fsp->fsp_name->st) {
2830 fsp->fsp_name->st = *psbuf;
2831 }
2832
2833 #if defined(POSIX_ACL_NEEDS_MASK)
2834 /* HP-UX always wants to have a mask (called "class" there). */
2835 needs_mask = True;
2836 #endif
2837
2838 if (the_acl == NULL) {
2839 DEBUG(0, ("sys_acl_init failed to allocate an ACL\n"));
2840 return false;
2841 }
2842
2843 if( DEBUGLVL( 10 )) {
2844 dbgtext("set_canon_ace_list: setting ACL:\n");
2845 for (i = 0, p_ace = the_ace; p_ace; p_ace = p_ace->next, i++ ) {
2846 print_canon_ace( p_ace, i);
2847 }
2848 }
2849
2850 for (i = 0, p_ace = the_ace; p_ace; p_ace = p_ace->next, i++ ) {
2851 SMB_ACL_ENTRY_T the_entry;
2852 SMB_ACL_PERMSET_T the_permset;
2853
2854 /*
2855 * ACLs only "need" an ACL_MASK entry if there are any named user or
2856 * named group entries. But if there is an ACL_MASK entry, it applies
2857 * to ACL_USER, ACL_GROUP, and ACL_GROUP_OBJ entries. Set the mask
2858 * so that it doesn't deny (i.e., mask off) any permissions.
2859 */
2860
2861 if (p_ace->type == SMB_ACL_USER || p_ace->type == SMB_ACL_GROUP) {
2862 needs_mask = True;
2863 mask_perms |= p_ace->perms;
2864 } else if (p_ace->type == SMB_ACL_GROUP_OBJ) {
2865 mask_perms |= p_ace->perms;
2866 }
2867
2868 /*
2869 * Get the entry for this ACE.
2870 */
2871
2872 if (sys_acl_create_entry(&the_acl, &the_entry) == -1) {
2873 DEBUG(0,("set_canon_ace_list: Failed to create entry %d. (%s)\n",
2874 i, strerror(errno) ));
2875 goto fail;
2876 }
2877
2878 if (p_ace->type == SMB_ACL_MASK) {
2879 mask_entry = the_entry;
2880 got_mask_entry = True;
2881 }
2882
2883 /*
2884 * Ok - we now know the ACL calls should be working, don't
2885 * allow fallback to chmod.
2886 */
2887
2888 *pacl_set_support = True;
2889
2890 /*
2891 * Initialise the entry from the canon_ace.
2892 */
2893
2894 /*
2895 * First tell the entry what type of ACE this is.
2896 */
2897
2898 if (sys_acl_set_tag_type(the_entry, p_ace->type) == -1) {
2899 DEBUG(0,("set_canon_ace_list: Failed to set tag type on entry %d. (%s)\n",
2900 i, strerror(errno) ));
2901 goto fail;
2902 }
2903
2904 /*
2905 * Only set the qualifier (user or group id) if the entry is a user
2906 * or group id ACE.
2907 */
2908
2909 if ((p_ace->type == SMB_ACL_USER) || (p_ace->type == SMB_ACL_GROUP)) {
2910 if (sys_acl_set_qualifier(the_entry,(void *)&p_ace->unix_ug.id) == -1) {
2911 DEBUG(0,("set_canon_ace_list: Failed to set qualifier on entry %d. (%s)\n",
2912 i, strerror(errno) ));
2913 goto fail;
2914 }
2915 }
2916
2917 /*
2918 * Convert the mode_t perms in the canon_ace to a POSIX permset.
2919 */
2920
2921 if (sys_acl_get_permset(the_entry, &the_permset) == -1) {
2922 DEBUG(0,("set_canon_ace_list: Failed to get permset on entry %d. (%s)\n",
2923 i, strerror(errno) ));
2924 goto fail;
2925 }
2926
2927 if (map_acl_perms_to_permset(conn, p_ace->perms, &the_permset) == -1) {
2928 DEBUG(0,("set_canon_ace_list: Failed to create permset for mode (%u) on entry %d. (%s)\n",
2929 (unsigned int)p_ace->perms, i, strerror(errno) ));
2930 goto fail;
2931 }
2932
2933 /*
2934 * ..and apply them to the entry.
2935 */
2936
2937 if (sys_acl_set_permset(the_entry, the_permset) == -1) {
2938 DEBUG(0,("set_canon_ace_list: Failed to add permset on entry %d. (%s)\n",
2939 i, strerror(errno) ));
2940 goto fail;
2941 }
2942
2943 if( DEBUGLVL( 10 ))
2944 print_canon_ace( p_ace, i);
2945
2946 }
2947
2948 if (needs_mask && !got_mask_entry) {
2949 if (sys_acl_create_entry(&the_acl, &mask_entry) == -1) {
2950 DEBUG(0,("set_canon_ace_list: Failed to create mask entry. (%s)\n", strerror(errno) ));
2951 goto fail;
2952 }
2953
2954 if (sys_acl_set_tag_type(mask_entry, SMB_ACL_MASK) == -1) {
2955 DEBUG(0,("set_canon_ace_list: Failed to set tag type on mask entry. (%s)\n",strerror(errno) ));
2956 goto fail;
2957 }
2958
2959 if (sys_acl_get_permset(mask_entry, &mask_permset) == -1) {
2960 DEBUG(0,("set_canon_ace_list: Failed to get mask permset. (%s)\n", strerror(errno) ));
2961 goto fail;
2962 }
2963
2964 if (map_acl_perms_to_permset(conn, S_IRUSR|S_IWUSR|S_IXUSR, &mask_permset) == -1) {
2965 DEBUG(0,("set_canon_ace_list: Failed to create mask permset. (%s)\n", strerror(errno) ));
2966 goto fail;
2967 }
2968
2969 if (sys_acl_set_permset(mask_entry, mask_permset) == -1) {
2970 DEBUG(0,("set_canon_ace_list: Failed to add mask permset. (%s)\n", strerror(errno) ));
2971 goto fail;
2972 }
2973 }
2974
2975 /*
2976 * Finally apply it to the file or directory.
2977 */
2978
2979 if(default_ace || fsp->is_directory || fsp->fh->fd == -1) {
2980 if (SMB_VFS_SYS_ACL_SET_FILE(conn, fsp->fsp_name->base_name,
2981 the_acl_type, the_acl) == -1) {
2982 /*
2983 * Some systems allow all the above calls and only fail with no ACL support
2984 * when attempting to apply the acl. HPUX with HFS is an example of this. JRA.
2985 */
2986 if (no_acl_syscall_error(errno)) {
2987 *pacl_set_support = False;
2988 }
2989
2990 if (acl_group_override(conn, fsp->fsp_name)) {
2991 int sret;
2992
2993 DEBUG(5,("set_canon_ace_list: acl group "
2994 "control on and current user in file "
2995 "%s primary group.\n",
2996 fsp_str_dbg(fsp)));
2997
2998 become_root();
2999 sret = SMB_VFS_SYS_ACL_SET_FILE(conn,
3000 fsp->fsp_name->base_name, the_acl_type,
3001 the_acl);
3002 unbecome_root();
3003 if (sret == 0) {
3004 ret = True;
3005 }
3006 }
3007
3008 if (ret == False) {
3009 DEBUG(2,("set_canon_ace_list: "
3010 "sys_acl_set_file type %s failed for "
3011 "file %s (%s).\n",
3012 the_acl_type == SMB_ACL_TYPE_DEFAULT ?
3013 "directory default" : "file",
3014 fsp_str_dbg(fsp), strerror(errno)));
3015 goto fail;
3016 }
3017 }
3018 } else {
3019 if (SMB_VFS_SYS_ACL_SET_FD(fsp, the_acl) == -1) {
3020 /*
3021 * Some systems allow all the above calls and only fail with no ACL support
3022 * when attempting to apply the acl. HPUX with HFS is an example of this. JRA.
3023 */
3024 if (no_acl_syscall_error(errno)) {
3025 *pacl_set_support = False;
3026 }
3027
3028 if (acl_group_override(conn, fsp->fsp_name)) {
3029 int sret;
3030
3031 DEBUG(5,("set_canon_ace_list: acl group "
3032 "control on and current user in file "
3033 "%s primary group.\n",
3034 fsp_str_dbg(fsp)));
3035
3036 become_root();
3037 sret = SMB_VFS_SYS_ACL_SET_FD(fsp, the_acl);
3038 unbecome_root();
3039 if (sret == 0) {
3040 ret = True;
3041 }
3042 }
3043
3044 if (ret == False) {
3045 DEBUG(2,("set_canon_ace_list: "
3046 "sys_acl_set_file failed for file %s "
3047 "(%s).\n",
3048 fsp_str_dbg(fsp), strerror(errno)));
3049 goto fail;
3050 }
3051 }
3052 }
3053
3054 ret = True;
3055
3056 fail:
3057
3058 if (the_acl != NULL) {
3059 TALLOC_FREE(the_acl);
3060 }
3061
3062 return ret;
3063 }
3064
3065 /****************************************************************************
3066
3067 ****************************************************************************/
3068
3069 SMB_ACL_T free_empty_sys_acl(connection_struct *conn, SMB_ACL_T the_acl)
3070 {
3071 SMB_ACL_ENTRY_T entry;
3072
3073 if (!the_acl)
3074 return NULL;
3075 if (sys_acl_get_entry(the_acl, SMB_ACL_FIRST_ENTRY, &entry) != 1) {
3076 TALLOC_FREE(the_acl);
3077 return NULL;
3078 }
3079 return the_acl;
3080 }
3081
3082 /****************************************************************************
3083 Convert a canon_ace to a generic 3 element permission - if possible.
3084 ****************************************************************************/
3085
3086 #define MAP_PERM(p,mask,result) (((p) & (mask)) ? (result) : 0 )
3087
3088 static bool convert_canon_ace_to_posix_perms( files_struct *fsp, canon_ace *file_ace_list, mode_t *posix_perms)
3089 {
3090 size_t ace_count = count_canon_ace_list(file_ace_list);
3091 canon_ace *ace_p;
3092 canon_ace *owner_ace = NULL;
3093 canon_ace *group_ace = NULL;
3094 canon_ace *other_ace = NULL;
3095
3096 if (ace_count != 3) {
3097 DEBUG(3,("convert_canon_ace_to_posix_perms: Too many ACE "
3098 "entries for file %s to convert to posix perms.\n",
3099 fsp_str_dbg(fsp)));
3100 return False;
3101 }
3102
3103 for (ace_p = file_ace_list; ace_p; ace_p = ace_p->next) {
3104 if (ace_p->owner_type == UID_ACE)
3105 owner_ace = ace_p;
3106 else if (ace_p->owner_type == GID_ACE)
3107 group_ace = ace_p;
3108 else if (ace_p->owner_type == WORLD_ACE)
3109 other_ace = ace_p;
3110 }
3111
3112 if (!owner_ace || !group_ace || !other_ace) {
3113 DEBUG(3,("convert_canon_ace_to_posix_perms: Can't get "
3114 "standard entries for file %s.\n", fsp_str_dbg(fsp)));
3115 return False;
3116 }
3117
3118 *posix_perms = (mode_t)0;
3119
3120 *posix_perms |= owner_ace->perms;
3121 *posix_perms |= MAP_PERM(group_ace->perms, S_IRUSR, S_IRGRP);
3122 *posix_perms |= MAP_PERM(group_ace->perms, S_IWUSR, S_IWGRP);
3123 *posix_perms |= MAP_PERM(group_ace->perms, S_IXUSR, S_IXGRP);
3124 *posix_perms |= MAP_PERM(other_ace->perms, S_IRUSR, S_IROTH);
3125 *posix_perms |= MAP_PERM(other_ace->perms, S_IWUSR, S_IWOTH);
3126 *posix_perms |= MAP_PERM(other_ace->perms, S_IXUSR, S_IXOTH);
3127
3128 /* The owner must have at least read access. */
3129
3130 *posix_perms |= S_IRUSR;
3131 if (fsp->is_directory)
3132 *posix_perms |= (S_IWUSR|S_IXUSR);
3133
3134 DEBUG(10,("convert_canon_ace_to_posix_perms: converted u=%o,g=%o,w=%o "
3135 "to perm=0%o for file %s.\n", (int)owner_ace->perms,
3136 (int)group_ace->perms, (int)other_ace->perms,
3137 (int)*posix_perms, fsp_str_dbg(fsp)));
3138
3139 return True;
3140 }
3141
3142 /****************************************************************************
3143 Incoming NT ACLs on a directory can be split into a default POSIX acl (CI|OI|IO) and
3144 a normal POSIX acl. Win2k needs these split acls re-merging into one ACL
3145 with CI|OI set so it is inherited and also applies to the directory.
3146 Based on code from "Jim McDonough" <jmcd@us.ibm.com>.
3147 ****************************************************************************/
3148
3149 static size_t merge_default_aces( struct security_ace *nt_ace_list, size_t num_aces)
3150 {
3151 size_t i, j;
3152
3153 for (i = 0; i < num_aces; i++) {
3154 for (j = i+1; j < num_aces; j++) {
3155 uint32 i_flags_ni = (nt_ace_list[i].flags & ~SEC_ACE_FLAG_INHERITED_ACE);
3156 uint32 j_flags_ni = (nt_ace_list[j].flags & ~SEC_ACE_FLAG_INHERITED_ACE);
3157 bool i_inh = (nt_ace_list[i].flags & SEC_ACE_FLAG_INHERITED_ACE) ? True : False;
3158 bool j_inh = (nt_ace_list[j].flags & SEC_ACE_FLAG_INHERITED_ACE) ? True : False;
3159
3160 /* We know the lower number ACE's are file entries. */
3161 if ((nt_ace_list[i].type == nt_ace_list[j].type) &&
3162 (nt_ace_list[i].size == nt_ace_list[j].size) &&
3163 (nt_ace_list[i].access_mask == nt_ace_list[j].access_mask) &&
3164 dom_sid_equal(&nt_ace_list[i].trustee, &nt_ace_list[j].trustee) &&
3165 (i_inh == j_inh) &&
3166 (i_flags_ni == 0) &&
3167 (j_flags_ni == (SEC_ACE_FLAG_OBJECT_INHERIT|
3168 SEC_ACE_FLAG_CONTAINER_INHERIT|
3169 SEC_ACE_FLAG_INHERIT_ONLY))) {
3170 /*
3171 * W2K wants to have access allowed zero access ACE's
3172 * at the end of the list. If the mask is zero, merge
3173 * the non-inherited ACE onto the inherited ACE.
3174 */
3175
3176 if (nt_ace_list[i].access_mask == 0) {
3177 nt_ace_list[j].flags = SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT|
3178 (i_inh ? SEC_ACE_FLAG_INHERITED_ACE : 0);
3179 if (num_aces - i - 1 > 0)
3180 memmove(&nt_ace_list[i], &nt_ace_list[i+1], (num_aces-i-1) *
3181 sizeof(struct security_ace));
3182
3183 DEBUG(10,("merge_default_aces: Merging zero access ACE %u onto ACE %u.\n",
3184 (unsigned int)i, (unsigned int)j ));
3185 } else {
3186 /*
3187 * These are identical except for the flags.
3188 * Merge the inherited ACE onto the non-inherited ACE.
3189 */
3190
3191 nt_ace_list[i].flags = SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT|
3192 (i_inh ? SEC_ACE_FLAG_INHERITED_ACE : 0);
3193 if (num_aces - j - 1 > 0)
3194 memmove(&nt_ace_list[j], &nt_ace_list[j+1], (num_aces-j-1) *
3195 sizeof(struct security_ace));
3196
3197 DEBUG(10,("merge_default_aces: Merging ACE %u onto ACE %u.\n",
3198 (unsigned int)j, (unsigned int)i ));
3199 }
3200 num_aces--;
3201 break;
3202 }
3203 }
3204 }
3205
3206 return num_aces;
3207 }
3208
3209 /*
3210 * Add or Replace ACE entry.
3211 * In some cases we need to add a specific ACE for compatibility reasons.
3212 * When doing that we must make sure we are not actually creating a duplicate
3213 * entry. So we need to search whether an ACE entry already exist and eventually
3214 * replacce the access mask, or add a completely new entry if none was found.
3215 *
3216 * This function assumes the array has enough space to add a new entry without
3217 * any reallocation of memory.
3218 */
3219
3220 static void add_or_replace_ace(struct security_ace *nt_ace_list, size_t *num_aces,
3221 const struct dom_sid *sid, enum security_ace_type type,
3222 uint32_t mask, uint8_t flags)
3223 {
3224 int i;
3225
3226 /* first search for a duplicate */
3227 for (i = 0; i < *num_aces; i++) {
3228 if (dom_sid_equal(&nt_ace_list[i].trustee, sid) &&
3229 (nt_ace_list[i].flags == flags)) break;
3230 }
3231
3232 if (i < *num_aces) { /* found */
3233 nt_ace_list[i].type = type;
3234 nt_ace_list[i].access_mask = mask;
3235 DEBUG(10, ("Replacing ACE %d with SID %s and flags %02x\n",
3236 i, sid_string_dbg(sid), flags));
3237 return;
3238 }
3239
3240 /* not found, append it */
3241 init_sec_ace(&nt_ace_list[(*num_aces)++], sid, type, mask, flags);
3242 }
3243
3244
3245 /****************************************************************************
3246 Reply to query a security descriptor from an fsp. If it succeeds it allocates
3247 the space for the return elements and returns the size needed to return the
3248 security descriptor. This should be the only external function needed for
3249 the UNIX style get ACL.
3250 ****************************************************************************/
3251
3252 static NTSTATUS posix_get_nt_acl_common(struct connection_struct *conn,
3253 const char *name,
3254 const SMB_STRUCT_STAT *sbuf,
3255 struct pai_val *pal,
3256 SMB_ACL_T posix_acl,
3257 SMB_ACL_T def_acl,
3258 uint32_t security_info,
3259 TALLOC_CTX *mem_ctx,
3260 struct security_descriptor **ppdesc)
3261 {
3262 struct dom_sid owner_sid;
3263 struct dom_sid group_sid;
3264 size_t sd_size = 0;
3265 struct security_acl *psa = NULL;
3266 size_t num_acls = 0;
3267 size_t num_def_acls = 0;
3268 size_t num_aces = 0;
3269 canon_ace *file_ace = NULL;
3270 canon_ace *dir_ace = NULL;
3271 struct security_ace *nt_ace_list = NULL;
3272 size_t num_profile_acls = 0;
3273 struct dom_sid orig_owner_sid;
3274 struct security_descriptor *psd = NULL;
3275 int i;
3276
3277 /*
3278 * Get the owner, group and world SIDs.
3279 */
3280
3281 create_file_sids(sbuf, &owner_sid, &group_sid);
3282
3283 if (lp_profile_acls(SNUM(conn))) {
3284 /* For WXP SP1 the owner must be administrators. */
3285 sid_copy(&orig_owner_sid, &owner_sid);
3286 sid_copy(&owner_sid, &global_sid_Builtin_Administrators);
3287 sid_copy(&group_sid, &global_sid_Builtin_Users);
3288 num_profile_acls = 3;
3289 }
3290
3291 if ((security_info & SECINFO_DACL) && !(security_info & SECINFO_PROTECTED_DACL)) {
3292
3293 /*
3294 * In the optimum case Creator Owner and Creator Group would be used for
3295 * the ACL_USER_OBJ and ACL_GROUP_OBJ entries, respectively, but this
3296 * would lead to usability problems under Windows: The Creator entries
3297 * are only available in browse lists of directories and not for files;
3298 * additionally the identity of the owning group couldn't be determined.
3299 * We therefore use those identities only for Default ACLs.
3300 */
3301
3302 /* Create the canon_ace lists. */
3303 file_ace = canonicalise_acl(conn, name, posix_acl, sbuf,
3304 &owner_sid, &group_sid, pal,
3305 SMB_ACL_TYPE_ACCESS);
3306
3307 /* We must have *some* ACLS. */
3308
3309 if (count_canon_ace_list(file_ace) == 0) {
3310 DEBUG(0,("get_nt_acl : No ACLs on file (%s) !\n", name));
3311 goto done;
3312 }
3313
3314 if (S_ISDIR(sbuf->st_ex_mode) && def_acl) {
3315 dir_ace = canonicalise_acl(conn, name, def_acl,
3316 sbuf,
3317 &global_sid_Creator_Owner,
3318 &global_sid_Creator_Group,
3319 pal, SMB_ACL_TYPE_DEFAULT);
3320 }
3321
3322 /*
3323 * Create the NT ACE list from the canonical ace lists.
3324 */
3325
3326 {
3327 canon_ace *ace;
3328 enum security_ace_type nt_acl_type;
3329
3330 num_acls = count_canon_ace_list(file_ace);
3331 num_def_acls = count_canon_ace_list(dir_ace);
3332
3333 /* Allocate the ace list. */
3334 if ((nt_ace_list = talloc_array(talloc_tos(), struct security_ace,num_acls + num_profile_acls + num_def_acls)) == NULL) {
3335 DEBUG(0,("get_nt_acl: Unable to malloc space for nt_ace_list.\n"));
3336 goto done;
3337 }
3338
3339 memset(nt_ace_list, '\0', (num_acls + num_def_acls) * sizeof(struct security_ace) );
3340
3341 /*
3342 * Create the NT ACE list from the canonical ace lists.
3343 */
3344
3345 for (ace = file_ace; ace != NULL; ace = ace->next) {
3346 uint32_t acc = map_canon_ace_perms(SNUM(conn),
3347 &nt_acl_type,
3348 ace->perms,
3349 S_ISDIR(sbuf->st_ex_mode));
3350 init_sec_ace(&nt_ace_list[num_aces++],
3351 &ace->trustee,
3352 nt_acl_type,
3353 acc,
3354 ace->ace_flags);
3355 }
3356
3357 /* The User must have access to a profile share - even
3358 * if we can't map the SID. */
3359 if (lp_profile_acls(SNUM(conn))) {
3360 add_or_replace_ace(nt_ace_list, &num_aces,
3361 &global_sid_Builtin_Users,
3362 SEC_ACE_TYPE_ACCESS_ALLOWED,
3363 FILE_GENERIC_ALL, 0);
3364 }
3365
3366 for (ace = dir_ace; ace != NULL; ace = ace->next) {
3367 uint32_t acc = map_canon_ace_perms(SNUM(conn),
3368 &nt_acl_type,
3369 ace->perms,
3370 S_ISDIR(sbuf->st_ex_mode));
3371 init_sec_ace(&nt_ace_list[num_aces++],
3372 &ace->trustee,
3373 nt_acl_type,
3374 acc,
3375 ace->ace_flags |
3376 SEC_ACE_FLAG_OBJECT_INHERIT|
3377 SEC_ACE_FLAG_CONTAINER_INHERIT|
3378 SEC_ACE_FLAG_INHERIT_ONLY);
3379 }
3380
3381 /* The User must have access to a profile share - even
3382 * if we can't map the SID. */
3383 if (lp_profile_acls(SNUM(conn))) {
3384 add_or_replace_ace(nt_ace_list, &num_aces,
3385 &global_sid_Builtin_Users,
3386 SEC_ACE_TYPE_ACCESS_ALLOWED,
3387 FILE_GENERIC_ALL,
3388 SEC_ACE_FLAG_OBJECT_INHERIT |
3389 SEC_ACE_FLAG_CONTAINER_INHERIT |
3390 SEC_ACE_FLAG_INHERIT_ONLY);
3391 }
3392
3393 /*
3394 * Merge POSIX default ACLs and normal ACLs into one NT ACE.
3395 * Win2K needs this to get the inheritance correct when replacing ACLs
3396 * on a directory tree. Based on work by Jim @ IBM.
3397 */
3398
3399 num_aces = merge_default_aces(nt_ace_list, num_aces);
3400
3401 if (lp_profile_acls(SNUM(conn))) {
3402 for (i = 0; i < num_aces; i++) {
3403 if (dom_sid_equal(&nt_ace_list[i].trustee, &owner_sid)) {
3404 add_or_replace_ace(nt_ace_list, &num_aces,
3405 &orig_owner_sid,
3406 nt_ace_list[i].type,
3407 nt_ace_list[i].access_mask,
3408 nt_ace_list[i].flags);
3409 break;
3410 }
3411 }
3412 }
3413 }
3414
3415 if (num_aces) {
3416 if((psa = make_sec_acl( talloc_tos(), NT4_ACL_REVISION, num_aces, nt_ace_list)) == NULL) {
3417 DEBUG(0,("get_nt_acl: Unable to malloc space for acl.\n"));
3418 goto done;
3419 }
3420 }
3421 } /* security_info & SECINFO_DACL */
3422
3423 psd = make_standard_sec_desc(mem_ctx,
3424 (security_info & SECINFO_OWNER) ? &owner_sid : NULL,
3425 (security_info & SECINFO_GROUP) ? &group_sid : NULL,
3426 psa,
3427 &sd_size);
3428
3429 if(!psd) {
3430 DEBUG(0,("get_nt_acl: Unable to malloc space for security descriptor.\n"));
3431 sd_size = 0;
3432 goto done;
3433 }
3434
3435 /*
3436 * Windows 2000: The DACL_PROTECTED flag in the security
3437 * descriptor marks the ACL as non-inheriting, i.e., no
3438 * ACEs from higher level directories propagate to this
3439 * ACL. In the POSIX ACL model permissions are only
3440 * inherited at file create time, so ACLs never contain
3441 * any ACEs that are inherited dynamically. The DACL_PROTECTED
3442 * flag doesn't seem to bother Windows NT.
3443 * Always set this if map acl inherit is turned off.
3444 */
3445 if (pal == NULL || !lp_map_acl_inherit(SNUM(conn))) {
3446 psd->type |= SEC_DESC_DACL_PROTECTED;
3447 } else {
3448 psd->type |= pal->sd_type;
3449 }
3450
3451 if (psd->dacl) {
3452 dacl_sort_into_canonical_order(psd->dacl->aces, (unsigned int)psd->dacl->num_aces);
3453 }
3454
3455 *ppdesc = psd;
3456
3457 done:
3458
3459 if (posix_acl) {
3460 TALLOC_FREE(posix_acl);
3461 }
3462 if (def_acl) {
3463 TALLOC_FREE(def_acl);
3464 }
3465 free_canon_ace_list(file_ace);
3466 free_canon_ace_list(dir_ace);
3467 free_inherited_info(pal);
3468 TALLOC_FREE(nt_ace_list);
3469
3470 return NT_STATUS_OK;
3471 }
3472
3473 NTSTATUS posix_fget_nt_acl(struct files_struct *fsp, uint32_t security_info,
3474 TALLOC_CTX *mem_ctx,
3475 struct security_descriptor **ppdesc)
3476 {
3477 SMB_STRUCT_STAT sbuf;
3478 SMB_ACL_T posix_acl = NULL;
3479 struct pai_val *pal;
3480 TALLOC_CTX *frame = talloc_stackframe();
3481 NTSTATUS status;
3482
3483 *ppdesc = NULL;
3484
3485 DEBUG(10,("posix_fget_nt_acl: called for file %s\n",
3486 fsp_str_dbg(fsp)));
3487
3488 /* can it happen that fsp_name == NULL ? */
3489 if (fsp->is_directory || fsp->fh->fd == -1) {
3490 status = posix_get_nt_acl(fsp->conn, fsp->fsp_name->base_name,
3491 security_info, mem_ctx, ppdesc);
3492 TALLOC_FREE(frame);
3493 return status;
3494 }
3495
3496 /* Get the stat struct for the owner info. */
3497 if(SMB_VFS_FSTAT(fsp, &sbuf) != 0) {
3498 TALLOC_FREE(frame);
3499 return map_nt_error_from_unix(errno);
3500 }
3501
3502 /* Get the ACL from the fd. */
3503 posix_acl = SMB_VFS_SYS_ACL_GET_FD(fsp, frame);
3504
3505 pal = fload_inherited_info(fsp);
3506
3507 status = posix_get_nt_acl_common(fsp->conn, fsp->fsp_name->base_name,
3508 &sbuf, pal, posix_acl, NULL,
3509 security_info, mem_ctx, ppdesc);
3510 TALLOC_FREE(frame);
3511 return status;
3512 }
3513
3514 NTSTATUS posix_get_nt_acl(struct connection_struct *conn, const char *name,
3515 uint32_t security_info,
3516 TALLOC_CTX *mem_ctx,
3517 struct security_descriptor **ppdesc)
3518 {
3519 SMB_ACL_T posix_acl = NULL;
3520 SMB_ACL_T def_acl = NULL;
3521 struct pai_val *pal;
3522 struct smb_filename smb_fname;
3523 int ret;
3524 TALLOC_CTX *frame = talloc_stackframe();
3525 NTSTATUS status;
3526
3527 *ppdesc = NULL;
3528
3529 DEBUG(10,("posix_get_nt_acl: called for file %s\n", name ));
3530
3531 ZERO_STRUCT(smb_fname);
3532 smb_fname.base_name = discard_const_p(char, name);
3533
3534 /* Get the stat struct for the owner info. */
3535 if (lp_posix_pathnames()) {
3536 ret = SMB_VFS_LSTAT(conn, &smb_fname);
3537 } else {
3538 ret = SMB_VFS_STAT(conn, &smb_fname);
3539 }
3540
3541 if (ret == -1) {
3542 TALLOC_FREE(frame);
3543 return map_nt_error_from_unix(errno);
3544 }
3545
3546 /* Get the ACL from the path. */
3547 posix_acl = SMB_VFS_SYS_ACL_GET_FILE(conn, name,
3548 SMB_ACL_TYPE_ACCESS, frame);
3549
3550 /* If it's a directory get the default POSIX ACL. */
3551 if(S_ISDIR(smb_fname.st.st_ex_mode)) {
3552 def_acl = SMB_VFS_SYS_ACL_GET_FILE(conn, name,
3553 SMB_ACL_TYPE_DEFAULT, frame);
3554 def_acl = free_empty_sys_acl(conn, def_acl);
3555 }
3556
3557 pal = load_inherited_info(conn, name);
3558
3559 status = posix_get_nt_acl_common(conn, name, &smb_fname.st, pal,
3560 posix_acl, def_acl, security_info,
3561 mem_ctx,
3562 ppdesc);
3563 TALLOC_FREE(frame);
3564 return status;
3565 }
3566
3567 /****************************************************************************
3568 Try to chown a file. We will be able to chown it under the following conditions.
3569
3570 1) If we have root privileges, then it will just work.
3571 2) If we have SeRestorePrivilege we can change the user + group to any other user.
3572 3) If we have SeTakeOwnershipPrivilege we can change the user to the current user.
3573 4) If we have write permission to the file and dos_filemodes is set
3574 then allow chown to the currently authenticated user.
3575 ****************************************************************************/
3576
3577 NTSTATUS try_chown(files_struct *fsp, uid_t uid, gid_t gid)
3578 {
3579 NTSTATUS status;
3580
3581 if(!CAN_WRITE(fsp->conn)) {
3582 return NT_STATUS_MEDIA_WRITE_PROTECTED;
3583 }
3584
3585 /* Case (1). */
3586 status = vfs_chown_fsp(fsp, uid, gid);
3587 if (NT_STATUS_IS_OK(status)) {
3588 return status;
3589 }
3590
3591 /* Case (2) / (3) */
3592 if (lp_enable_privileges()) {
3593 bool has_take_ownership_priv = security_token_has_privilege(
3594 get_current_nttok(fsp->conn),
3595 SEC_PRIV_TAKE_OWNERSHIP);
3596 bool has_restore_priv = security_token_has_privilege(
3597 get_current_nttok(fsp->conn),
3598 SEC_PRIV_RESTORE);
3599
3600 if (has_restore_priv) {
3601 ; /* Case (2) */
3602 } else if (has_take_ownership_priv) {
3603 /* Case (3) */
3604 if (uid == get_current_uid(fsp->conn)) {
3605 gid = (gid_t)-1;
3606 } else {
3607 has_take_ownership_priv = false;
3608 }
3609 }
3610
3611 if (has_take_ownership_priv || has_restore_priv) {
3612 become_root();
3613 status = vfs_chown_fsp(fsp, uid, gid);
3614 unbecome_root();
3615 return status;
3616 }
3617 }
3618
3619 /* Case (4). */
3620 if (!lp_dos_filemode(SNUM(fsp->conn))) {
3621 return NT_STATUS_ACCESS_DENIED;
3622 }
3623
3624 /* only allow chown to the current user. This is more secure,
3625 and also copes with the case where the SID in a take ownership ACL is
3626 a local SID on the users workstation
3627 */
3628 if (uid != get_current_uid(fsp->conn)) {
3629 return NT_STATUS_ACCESS_DENIED;
3630 }
3631
3632 become_root();
3633 /* Keep the current file gid the same. */
3634 status = vfs_chown_fsp(fsp, uid, (gid_t)-1);
3635 unbecome_root();
3636
3637 return status;
3638 }
3639
3640 /****************************************************************************
3641 Reply to set a security descriptor on an fsp. security_info_sent is the
3642 description of the following NT ACL.
3643 This should be the only external function needed for the UNIX style set ACL.
3644 We make a copy of psd_orig as internal functions modify the elements inside
3645 it, even though it's a const pointer.
3646 ****************************************************************************/
3647
3648 NTSTATUS set_nt_acl(files_struct *fsp, uint32 security_info_sent, const struct security_descriptor *psd_orig)
3649 {
3650 connection_struct *conn = fsp->conn;
3651 uid_t user = (uid_t)-1;
3652 gid_t grp = (gid_t)-1;
3653 struct dom_sid file_owner_sid;
3654 struct dom_sid file_grp_sid;
3655 canon_ace *file_ace_list = NULL;
3656 canon_ace *dir_ace_list = NULL;
3657 bool acl_perms = False;
3658 mode_t orig_mode = (mode_t)0;
3659 NTSTATUS status;
3660 bool set_acl_as_root = false;
3661 bool acl_set_support = false;
3662 bool ret = false;
3663 struct security_descriptor *psd = NULL;
3664
3665 DEBUG(10,("set_nt_acl: called for file %s\n",
3666 fsp_str_dbg(fsp)));
3667
3668 if (!CAN_WRITE(conn)) {
3669 DEBUG(10,("set acl rejected on read-only share\n"));
3670 return NT_STATUS_MEDIA_WRITE_PROTECTED;
3671 }
3672
3673 if (!psd_orig) {
3674 return NT_STATUS_INVALID_PARAMETER;
3675 }
3676
3677 psd = dup_sec_desc(talloc_tos(), psd_orig);
3678 if (!psd) {
3679 return NT_STATUS_NO_MEMORY;
3680 }
3681
3682 /*
3683 * Get the current state of the file.
3684 */
3685
3686 status = vfs_stat_fsp(fsp);
3687 if (!NT_STATUS_IS_OK(status)) {
3688 return status;
3689 }
3690
3691 /* Save the original element we check against. */
3692 orig_mode = fsp->fsp_name->st.st_ex_mode;
3693
3694 /*
3695 * Unpack the user/group/world id's.
3696 */
3697
3698 /* POSIX can't cope with missing owner/group. */
3699 if ((security_info_sent & SECINFO_OWNER) && (psd->owner_sid == NULL)) {
3700 security_info_sent &= ~SECINFO_OWNER;
3701 }
3702 if ((security_info_sent & SECINFO_GROUP) && (psd->group_sid == NULL)) {
3703 security_info_sent &= ~SECINFO_GROUP;
3704 }
3705
3706 status = unpack_nt_owners( conn, &user, &grp, security_info_sent, psd);
3707 if (!NT_STATUS_IS_OK(status)) {
3708 return status;
3709 }
3710
3711 /*
3712 * Do we need to chown ? If so this must be done first as the incoming
3713 * CREATOR_OWNER acl will be relative to the *new* owner, not the old.
3714 * Noticed by Simo.
3715 */
3716
3717 if (((user != (uid_t)-1) && (fsp->fsp_name->st.st_ex_uid != user)) ||
3718 (( grp != (gid_t)-1) && (fsp->fsp_name->st.st_ex_gid != grp))) {
3719
3720 DEBUG(3,("set_nt_acl: chown %s. uid = %u, gid = %u.\n",
3721 fsp_str_dbg(fsp), (unsigned int)user,
3722 (unsigned int)grp));
3723
3724 status = try_chown(fsp, user, grp);
3725 if(!NT_STATUS_IS_OK(status)) {
3726 DEBUG(3,("set_nt_acl: chown %s, %u, %u failed. Error "
3727 "= %s.\n", fsp_str_dbg(fsp),
3728 (unsigned int)user,
3729 (unsigned int)grp,
3730 nt_errstr(status)));
3731 return status;
3732 }
3733
3734 /*
3735 * Recheck the current state of the file, which may have changed.
3736 * (suid/sgid bits, for instance)
3737 */
3738
3739 status = vfs_stat_fsp(fsp);
3740 if (!NT_STATUS_IS_OK(status)) {
3741 return status;
3742 }
3743
3744 /* Save the original element we check against. */
3745 orig_mode = fsp->fsp_name->st.st_ex_mode;
3746
3747 /* If we successfully chowned, we know we must
3748 * be able to set the acl, so do it as root.
3749 */
3750 set_acl_as_root = true;
3751 }
3752
3753 create_file_sids(&fsp->fsp_name->st, &file_owner_sid, &file_grp_sid);
3754
3755 if((security_info_sent & SECINFO_DACL) &&
3756 (psd->type & SEC_DESC_DACL_PRESENT) &&
3757 (psd->dacl == NULL)) {
3758 struct security_ace ace[3];
3759
3760 /* We can't have NULL DACL in POSIX.
3761 Use owner/group/Everyone -> full access. */
3762
3763 init_sec_ace(&ace[0],
3764 &file_owner_sid,
3765 SEC_ACE_TYPE_ACCESS_ALLOWED,
3766 GENERIC_ALL_ACCESS,
3767 0);
3768 init_sec_ace(&ace[1],
3769 &file_grp_sid,
3770 SEC_ACE_TYPE_ACCESS_ALLOWED,
3771 GENERIC_ALL_ACCESS,
3772 0);
3773 init_sec_ace(&ace[2],
3774 &global_sid_World,
3775 SEC_ACE_TYPE_ACCESS_ALLOWED,
3776 GENERIC_ALL_ACCESS,
3777 0);
3778 psd->dacl = make_sec_acl(talloc_tos(),
3779 NT4_ACL_REVISION,
3780 3,
3781 ace);
3782 if (psd->dacl == NULL) {
3783 return NT_STATUS_NO_MEMORY;
3784 }
3785 security_acl_map_generic(psd->dacl, &file_generic_mapping);
3786 }
3787
3788 acl_perms = unpack_canon_ace(fsp, &fsp->fsp_name->st, &file_owner_sid,
3789 &file_grp_sid, &file_ace_list,
3790 &dir_ace_list, security_info_sent, psd);
3791
3792 /* Ignore W2K traverse DACL set. */
3793 if (!file_ace_list && !dir_ace_list) {
3794 return NT_STATUS_OK;
3795 }
3796
3797 if (!acl_perms) {
3798 DEBUG(3,("set_nt_acl: cannot set permissions\n"));
3799 free_canon_ace_list(file_ace_list);
3800 free_canon_ace_list(dir_ace_list);
3801 return NT_STATUS_ACCESS_DENIED;
3802 }
3803
3804 /*
3805 * Only change security if we got a DACL.
3806 */
3807
3808 if(!(security_info_sent & SECINFO_DACL) || (psd->dacl == NULL)) {
3809 free_canon_ace_list(file_ace_list);
3810 free_canon_ace_list(dir_ace_list);
3811 return NT_STATUS_OK;
3812 }
3813
3814 /*
3815 * Try using the POSIX ACL set first. Fall back to chmod if
3816 * we have no ACL support on this filesystem.
3817 */
3818
3819 if (acl_perms && file_ace_list) {
3820 if (set_acl_as_root) {
3821 become_root();
3822 }
3823 ret = set_canon_ace_list(fsp, file_ace_list, false,
3824 &fsp->fsp_name->st, &acl_set_support);
3825 if (set_acl_as_root) {
3826 unbecome_root();
3827 }
3828 if (acl_set_support && ret == false) {
3829 DEBUG(3,("set_nt_acl: failed to set file acl on file "
3830 "%s (%s).\n", fsp_str_dbg(fsp),
3831 strerror(errno)));
3832 free_canon_ace_list(file_ace_list);
3833 free_canon_ace_list(dir_ace_list);
3834 return map_nt_error_from_unix(errno);
3835 }
3836 }
3837
3838 if (acl_perms && acl_set_support && fsp->is_directory) {
3839 if (dir_ace_list) {
3840 if (set_acl_as_root) {
3841 become_root();
3842 }
3843 ret = set_canon_ace_list(fsp, dir_ace_list, true,
3844 &fsp->fsp_name->st,
3845 &acl_set_support);
3846 if (set_acl_as_root) {
3847 unbecome_root();
3848 }
3849 if (ret == false) {
3850 DEBUG(3,("set_nt_acl: failed to set default "
3851 "acl on directory %s (%s).\n",
3852 fsp_str_dbg(fsp), strerror(errno)));
3853 free_canon_ace_list(file_ace_list);
3854 free_canon_ace_list(dir_ace_list);
3855 return map_nt_error_from_unix(errno);
3856 }
3857 } else {
3858 int sret = -1;
3859
3860 /*
3861 * No default ACL - delete one if it exists.
3862 */
3863
3864 if (set_acl_as_root) {
3865 become_root();
3866 }
3867 sret = SMB_VFS_SYS_ACL_DELETE_DEF_FILE(conn,
3868 fsp->fsp_name->base_name);
3869 if (set_acl_as_root) {
3870 unbecome_root();
3871 }
3872 if (sret == -1) {
3873 if (acl_group_override(conn, fsp->fsp_name)) {
3874 DEBUG(5,("set_nt_acl: acl group "
3875 "control on and current user "
3876 "in file %s primary group. "
3877 "Override delete_def_acl\n",
3878 fsp_str_dbg(fsp)));
3879
3880 become_root();
3881 sret =
3882 SMB_VFS_SYS_ACL_DELETE_DEF_FILE(
3883 conn,
3884 fsp->fsp_name->base_name);
3885 unbecome_root();
3886 }
3887
3888 if (sret == -1) {
3889 DEBUG(3,("set_nt_acl: sys_acl_delete_def_file failed (%s)\n", strerror(errno)));
3890 free_canon_ace_list(file_ace_list);
3891 free_canon_ace_list(dir_ace_list);
3892 return map_nt_error_from_unix(errno);
3893 }
3894 }
3895 }
3896 }
3897
3898 if (acl_set_support) {
3899 if (set_acl_as_root) {
3900 become_root();
3901 }
3902 store_inheritance_attributes(fsp,
3903 file_ace_list,
3904 dir_ace_list,
3905 psd->type);
3906 if (set_acl_as_root) {
3907 unbecome_root();
3908 }
3909 }
3910
3911 /*
3912 * If we cannot set using POSIX ACLs we fall back to checking if we need to chmod.
3913 */
3914
3915 if(!acl_set_support && acl_perms) {
3916 mode_t posix_perms;
3917
3918 if (!convert_canon_ace_to_posix_perms( fsp, file_ace_list, &posix_perms)) {
3919 free_canon_ace_list(file_ace_list);
3920 free_canon_ace_list(dir_ace_list);
3921 DEBUG(3,("set_nt_acl: failed to convert file acl to "
3922 "posix permissions for file %s.\n",
3923 fsp_str_dbg(fsp)));
3924 return NT_STATUS_ACCESS_DENIED;
3925 }
3926
3927 if (orig_mode != posix_perms) {
3928 int sret = -1;
3929
3930 DEBUG(3,("set_nt_acl: chmod %s. perms = 0%o.\n",
3931 fsp_str_dbg(fsp), (unsigned int)posix_perms));
3932
3933 if (set_acl_as_root) {
3934 become_root();
3935 }
3936 sret = SMB_VFS_CHMOD(conn, fsp->fsp_name->base_name,
3937 posix_perms);
3938 if (set_acl_as_root) {
3939 unbecome_root();
3940 }
3941 if(sret == -1) {
3942 if (acl_group_override(conn, fsp->fsp_name)) {
3943 DEBUG(5,("set_nt_acl: acl group "
3944 "control on and current user "
3945 "in file %s primary group. "
3946 "Override chmod\n",
3947 fsp_str_dbg(fsp)));
3948
3949 become_root();
3950 sret = SMB_VFS_CHMOD(conn,
3951 fsp->fsp_name->base_name,
3952 posix_perms);
3953 unbecome_root();
3954 }
3955
3956 if (sret == -1) {
3957 DEBUG(3,("set_nt_acl: chmod %s, 0%o "
3958 "failed. Error = %s.\n",
3959 fsp_str_dbg(fsp),
3960 (unsigned int)posix_perms,
3961 strerror(errno)));
3962 free_canon_ace_list(file_ace_list);
3963 free_canon_ace_list(dir_ace_list);
3964 return map_nt_error_from_unix(errno);
3965 }
3966 }
3967 }
3968 }
3969
3970 free_canon_ace_list(file_ace_list);
3971 free_canon_ace_list(dir_ace_list);
3972
3973 /* Ensure the stat struct in the fsp is correct. */
3974 status = vfs_stat_fsp(fsp);
3975
3976 return NT_STATUS_OK;
3977 }
3978
3979 /****************************************************************************
3980 Get the actual group bits stored on a file with an ACL. Has no effect if
3981 the file has no ACL. Needed in dosmode code where the stat() will return
3982 the mask bits, not the real group bits, for a file with an ACL.
3983 ****************************************************************************/
3984
3985 int get_acl_group_bits( connection_struct *conn, const char *fname, mode_t *mode )
3986 {
3987 int entry_id = SMB_ACL_FIRST_ENTRY;
3988 SMB_ACL_ENTRY_T entry;
3989 SMB_ACL_T posix_acl;
3990 int result = -1;
3991
3992 posix_acl = SMB_VFS_SYS_ACL_GET_FILE(conn, fname,
3993 SMB_ACL_TYPE_ACCESS, talloc_tos());
3994 if (posix_acl == (SMB_ACL_T)NULL)
3995 return -1;
3996
3997 while (sys_acl_get_entry(posix_acl, entry_id, &entry) == 1) {
3998 SMB_ACL_TAG_T tagtype;
3999 SMB_ACL_PERMSET_T permset;
4000
4001 entry_id = SMB_ACL_NEXT_ENTRY;
4002
4003 if (sys_acl_get_tag_type(entry, &tagtype) ==-1)
4004 break;
4005
4006 if (tagtype == SMB_ACL_GROUP_OBJ) {
4007 if (sys_acl_get_permset(entry, &permset) == -1) {
4008 break;
4009 } else {
4010 *mode &= ~(S_IRGRP|S_IWGRP|S_IXGRP);
4011 *mode |= (sys_acl_get_perm(permset, SMB_ACL_READ) ? S_IRGRP : 0);
4012 *mode |= (sys_acl_get_perm(permset, SMB_ACL_WRITE) ? S_IWGRP : 0);
4013 *mode |= (sys_acl_get_perm(permset, SMB_ACL_EXECUTE) ? S_IXGRP : 0);
4014 result = 0;
4015 break;
4016 }
4017 }
4018 }
4019 TALLOC_FREE(posix_acl);
4020 return result;
4021 }
4022
4023 /****************************************************************************
4024 Do a chmod by setting the ACL USER_OBJ, GROUP_OBJ and OTHER bits in an ACL
4025 and set the mask to rwx. Needed to preserve complex ACLs set by NT.
4026 ****************************************************************************/
4027
4028 static int chmod_acl_internals( connection_struct *conn, SMB_ACL_T posix_acl, mode_t mode)
4029 {
4030 int entry_id = SMB_ACL_FIRST_ENTRY;
4031 SMB_ACL_ENTRY_T entry;
4032 int num_entries = 0;
4033
4034 while ( sys_acl_get_entry(posix_acl, entry_id, &entry) == 1) {
4035 SMB_ACL_TAG_T tagtype;
4036 SMB_ACL_PERMSET_T permset;
4037 mode_t perms;
4038
4039 entry_id = SMB_ACL_NEXT_ENTRY;
4040
4041 if (sys_acl_get_tag_type(entry, &tagtype) == -1)
4042 return -1;
4043
4044 if (sys_acl_get_permset(entry, &permset) == -1)
4045 return -1;
4046
4047 num_entries++;
4048
4049 switch(tagtype) {
4050 case SMB_ACL_USER_OBJ:
4051 perms = unix_perms_to_acl_perms(mode, S_IRUSR, S_IWUSR, S_IXUSR);
4052 break;
4053 case SMB_ACL_GROUP_OBJ:
4054 perms = unix_perms_to_acl_perms(mode, S_IRGRP, S_IWGRP, S_IXGRP);
4055 break;
4056 case SMB_ACL_MASK:
4057 /*
4058 * FIXME: The ACL_MASK entry permissions should really be set to
4059 * the union of the permissions of all ACL_USER,
4060 * ACL_GROUP_OBJ, and ACL_GROUP entries. That's what
4061 * acl_calc_mask() does, but Samba ACLs doesn't provide it.
4062 */
4063 perms = S_IRUSR|S_IWUSR|S_IXUSR;
4064 break;
4065 case SMB_ACL_OTHER:
4066 perms = unix_perms_to_acl_perms(mode, S_IROTH, S_IWOTH, S_IXOTH);
4067 break;
4068 default:
4069 continue;
4070 }
4071
4072 if (map_acl_perms_to_permset(conn, perms, &permset) == -1)
4073 return -1;
4074
4075 if (sys_acl_set_permset(entry, permset) == -1)
4076 return -1;
4077 }
4078
4079 /*
4080 * If this is a simple 3 element ACL or no elements then it's a standard
4081 * UNIX permission set. Just use chmod...
4082 */
4083
4084 if ((num_entries == 3) || (num_entries == 0))
4085 return -1;
4086
4087 return 0;
4088 }
4089
4090 /****************************************************************************
4091 Get the access ACL of FROM, do a chmod by setting the ACL USER_OBJ,
4092 GROUP_OBJ and OTHER bits in an ACL and set the mask to rwx. Set the
4093 resulting ACL on TO. Note that name is in UNIX character set.
4094 ****************************************************************************/
4095
4096 static int copy_access_posix_acl(connection_struct *conn, const char *from, const char *to, mode_t mode)
4097 {
4098 SMB_ACL_T posix_acl = NULL;
4099 int ret = -1;
4100
4101 if ((posix_acl = SMB_VFS_SYS_ACL_GET_FILE(conn, from,
4102 SMB_ACL_TYPE_ACCESS,
4103 talloc_tos())) == NULL)
4104 return -1;
4105
4106 if ((ret = chmod_acl_internals(conn, posix_acl, mode)) == -1)
4107 goto done;
4108
4109 ret = SMB_VFS_SYS_ACL_SET_FILE(conn, to, SMB_ACL_TYPE_ACCESS, posix_acl);
4110
4111 done:
4112
4113 TALLOC_FREE(posix_acl);
4114 return ret;
4115 }
4116
4117 /****************************************************************************
4118 Do a chmod by setting the ACL USER_OBJ, GROUP_OBJ and OTHER bits in an ACL
4119 and set the mask to rwx. Needed to preserve complex ACLs set by NT.
4120 Note that name is in UNIX character set.
4121 ****************************************************************************/
4122
4123 int chmod_acl(connection_struct *conn, const char *name, mode_t mode)
4124 {
4125 return copy_access_posix_acl(conn, name, name, mode);
4126 }
4127
4128 /****************************************************************************
4129 Check for an existing default POSIX ACL on a directory.
4130 ****************************************************************************/
4131
4132 static bool directory_has_default_posix_acl(connection_struct *conn, const char *fname)
4133 {
4134 SMB_ACL_T def_acl = SMB_VFS_SYS_ACL_GET_FILE(conn, fname,
4135 SMB_ACL_TYPE_DEFAULT,
4136 talloc_tos());
4137 bool has_acl = False;
4138 SMB_ACL_ENTRY_T entry;
4139
4140 if (def_acl != NULL && (sys_acl_get_entry(def_acl, SMB_ACL_FIRST_ENTRY, &entry) == 1)) {
4141 has_acl = True;
4142 }
4143
4144 if (def_acl) {
4145 TALLOC_FREE(def_acl);
4146 }
4147 return has_acl;
4148 }
4149
4150 /****************************************************************************
4151 If the parent directory has no default ACL but it does have an Access ACL,
4152 inherit this Access ACL to file name.
4153 ****************************************************************************/
4154
4155 int inherit_access_posix_acl(connection_struct *conn, const char *inherit_from_dir,
4156 const char *name, mode_t mode)
4157 {
4158 if (directory_has_default_posix_acl(conn, inherit_from_dir))
4159 return 0;
4160
4161 return copy_access_posix_acl(conn, inherit_from_dir, name, mode);
4162 }
4163
4164 /****************************************************************************
4165 Do an fchmod by setting the ACL USER_OBJ, GROUP_OBJ and OTHER bits in an ACL
4166 and set the mask to rwx. Needed to preserve complex ACLs set by NT.
4167 ****************************************************************************/
4168
4169 int fchmod_acl(files_struct *fsp, mode_t mode)
4170 {
4171 connection_struct *conn = fsp->conn;
4172 SMB_ACL_T posix_acl = NULL;
4173 int ret = -1;
4174
4175 if ((posix_acl = SMB_VFS_SYS_ACL_GET_FD(fsp, talloc_tos())) == NULL)
4176 return -1;
4177
4178 if ((ret = chmod_acl_internals(conn, posix_acl, mode)) == -1)
4179 goto done;
4180
4181 ret = SMB_VFS_SYS_ACL_SET_FD(fsp, posix_acl);
4182
4183 done:
4184
4185 TALLOC_FREE(posix_acl);
4186 return ret;
4187 }
4188
4189 /****************************************************************************
4190 Map from wire type to permset.
4191 ****************************************************************************/
4192
4193 static bool unix_ex_wire_to_permset(connection_struct *conn, unsigned char wire_perm, SMB_ACL_PERMSET_T *p_permset)
4194 {
4195 if (wire_perm & ~(SMB_POSIX_ACL_READ|SMB_POSIX_ACL_WRITE|SMB_POSIX_ACL_EXECUTE)) {
4196 return False;
4197 }
4198
4199 if (sys_acl_clear_perms(*p_permset) == -1) {
4200 return False;
4201 }
4202
4203 if (wire_perm & SMB_POSIX_ACL_READ) {
4204 if (sys_acl_add_perm(*p_permset, SMB_ACL_READ) == -1) {
4205 return False;
4206 }
4207 }
4208 if (wire_perm & SMB_POSIX_ACL_WRITE) {
4209 if (sys_acl_add_perm(*p_permset, SMB_ACL_WRITE) == -1) {
4210 return False;
4211 }
4212 }
4213 if (wire_perm & SMB_POSIX_ACL_EXECUTE) {
4214 if (sys_acl_add_perm(*p_permset, SMB_ACL_EXECUTE) == -1) {
4215 return False;
4216 }
4217 }
4218 return True;
4219 }
4220
4221 /****************************************************************************
4222 Map from wire type to tagtype.
4223 ****************************************************************************/
4224
4225 static bool unix_ex_wire_to_tagtype(unsigned char wire_tt, SMB_ACL_TAG_T *p_tt)
4226 {
4227 switch (wire_tt) {
4228 case SMB_POSIX_ACL_USER_OBJ:
4229 *p_tt = SMB_ACL_USER_OBJ;
4230 break;
4231 case SMB_POSIX_ACL_USER:
4232 *p_tt = SMB_ACL_USER;
4233 break;
4234 case SMB_POSIX_ACL_GROUP_OBJ:
4235 *p_tt = SMB_ACL_GROUP_OBJ;
4236 break;
4237 case SMB_POSIX_ACL_GROUP:
4238 *p_tt = SMB_ACL_GROUP;
4239 break;
4240 case SMB_POSIX_ACL_MASK:
4241 *p_tt = SMB_ACL_MASK;
4242 break;
4243 case SMB_POSIX_ACL_OTHER:
4244 *p_tt = SMB_ACL_OTHER;
4245 break;
4246 default:
4247 return False;
4248 }
4249 return True;
4250 }
4251
4252 /****************************************************************************
4253 Create a new POSIX acl from wire permissions.
4254 FIXME ! How does the share mask/mode fit into this.... ?
4255 ****************************************************************************/
4256
4257 static SMB_ACL_T create_posix_acl_from_wire(connection_struct *conn,
4258 uint16 num_acls,
4259 const char *pdata,
4260 TALLOC_CTX *mem_ctx)
4261 {
4262 unsigned int i;
4263 SMB_ACL_T the_acl = sys_acl_init(mem_ctx);
4264
4265 if (the_acl == NULL) {
4266 return NULL;
4267 }
4268
4269 for (i = 0; i < num_acls; i++) {
4270 SMB_ACL_ENTRY_T the_entry;
4271 SMB_ACL_PERMSET_T the_permset;
4272 SMB_ACL_TAG_T tag_type;
4273
4274 if (sys_acl_create_entry(&the_acl, &the_entry) == -1) {
4275 DEBUG(0,("create_posix_acl_from_wire: Failed to create entry %u. (%s)\n",
4276 i, strerror(errno) ));
4277 goto fail;
4278 }
4279
4280 if (!unix_ex_wire_to_tagtype(CVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)), &tag_type)) {
4281 DEBUG(0,("create_posix_acl_from_wire: invalid wire tagtype %u on entry %u.\n",
4282 CVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)), i ));
4283 goto fail;
4284 }
4285
4286 if (sys_acl_set_tag_type(the_entry, tag_type) == -1) {
4287 DEBUG(0,("create_posix_acl_from_wire: Failed to set tagtype on entry %u. (%s)\n",
4288 i, strerror(errno) ));
4289 goto fail;
4290 }
4291
4292 /* Get the permset pointer from the new ACL entry. */
4293 if (sys_acl_get_permset(the_entry, &the_permset) == -1) {
4294 DEBUG(0,("create_posix_acl_from_wire: Failed to get permset on entry %u. (%s)\n",
4295 i, strerror(errno) ));
4296 goto fail;
4297 }
4298
4299 /* Map from wire to permissions. */
4300 if (!unix_ex_wire_to_permset(conn, CVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)+1), &the_permset)) {
4301 DEBUG(0,("create_posix_acl_from_wire: invalid permset %u on entry %u.\n",
4302 CVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE) + 1), i ));
4303 goto fail;
4304 }
4305
4306 /* Now apply to the new ACL entry. */
4307 if (sys_acl_set_permset(the_entry, the_permset) == -1) {
4308 DEBUG(0,("create_posix_acl_from_wire: Failed to add permset on entry %u. (%s)\n",
4309 i, strerror(errno) ));
4310 goto fail;
4311 }
4312
4313 if (tag_type == SMB_ACL_USER) {
4314 uint32 uidval = IVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)+2);
4315 uid_t uid = (uid_t)uidval;
4316 if (sys_acl_set_qualifier(the_entry,(void *)&uid) == -1) {
4317 DEBUG(0,("create_posix_acl_from_wire: Failed to set uid %u on entry %u. (%s)\n",
4318 (unsigned int)uid, i, strerror(errno) ));
4319 goto fail;
4320 }
4321 }
4322
4323 if (tag_type == SMB_ACL_GROUP) {
4324 uint32 gidval = IVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)+2);
4325 gid_t gid = (uid_t)gidval;
4326 if (sys_acl_set_qualifier(the_entry,(void *)&gid) == -1) {
4327 DEBUG(0,("create_posix_acl_from_wire: Failed to set gid %u on entry %u. (%s)\n",
4328 (unsigned int)gid, i, strerror(errno) ));
4329 goto fail;
4330 }
4331 }
4332 }
4333
4334 return the_acl;
4335
4336 fail:
4337
4338 if (the_acl != NULL) {
4339 TALLOC_FREE(the_acl);
4340 }
4341 return NULL;
4342 }
4343
4344 /****************************************************************************
4345 Calls from UNIX extensions - Default POSIX ACL set.
4346 If num_def_acls == 0 and not a directory just return. If it is a directory
4347 and num_def_acls == 0 then remove the default acl. Else set the default acl
4348 on the directory.
4349 ****************************************************************************/
4350
4351 bool set_unix_posix_default_acl(connection_struct *conn, const char *fname, const SMB_STRUCT_STAT *psbuf,
4352 uint16 num_def_acls, const char *pdata)
4353 {
4354 SMB_ACL_T def_acl = NULL;
4355
4356 if (!S_ISDIR(psbuf->st_ex_mode)) {
4357 if (num_def_acls) {
4358 DEBUG(5,("set_unix_posix_default_acl: Can't set default ACL on non-directory file %s\n", fname ));
4359 errno = EISDIR;
4360 return False;
4361 } else {
4362 return True;
4363 }
4364 }
4365
4366 if (!num_def_acls) {
4367 /* Remove the default ACL. */
4368 if (SMB_VFS_SYS_ACL_DELETE_DEF_FILE(conn, fname) == -1) {
4369 DEBUG(5,("set_unix_posix_default_acl: acl_delete_def_file failed on directory %s (%s)\n",
4370 fname, strerror(errno) ));
4371 return False;
4372 }
4373 return True;
4374 }
4375
4376 if ((def_acl = create_posix_acl_from_wire(conn, num_def_acls,
4377 pdata,
4378 talloc_tos())) == NULL) {
4379 return False;
4380 }
4381
4382 if (SMB_VFS_SYS_ACL_SET_FILE(conn, fname, SMB_ACL_TYPE_DEFAULT, def_acl) == -1) {
4383 DEBUG(5,("set_unix_posix_default_acl: acl_set_file failed on directory %s (%s)\n",
4384 fname, strerror(errno) ));
4385 TALLOC_FREE(def_acl);
4386 return False;
4387 }
4388
4389 DEBUG(10,("set_unix_posix_default_acl: set default acl for file %s\n", fname ));
4390 TALLOC_FREE(def_acl);
4391 return True;
4392 }
4393
4394 /****************************************************************************
4395 Remove an ACL from a file. As we don't have acl_delete_entry() available
4396 we must read the current acl and copy all entries except MASK, USER and GROUP
4397 to a new acl, then set that. This (at least on Linux) causes any ACL to be
4398 removed.
4399 FIXME ! How does the share mask/mode fit into this.... ?
4400 ****************************************************************************/
4401
4402 static bool remove_posix_acl(connection_struct *conn, files_struct *fsp, const char *fname)
4403 {
4404 SMB_ACL_T file_acl = NULL;
4405 int entry_id = SMB_ACL_FIRST_ENTRY;
4406 SMB_ACL_ENTRY_T entry;
4407 bool ret = False;
4408 /* Create a new ACL with only 3 entries, u/g/w. */
4409 SMB_ACL_T new_file_acl = sys_acl_init(talloc_tos());
4410 SMB_ACL_ENTRY_T user_ent = NULL;
4411 SMB_ACL_ENTRY_T group_ent = NULL;
4412 SMB_ACL_ENTRY_T other_ent = NULL;
4413
4414 if (new_file_acl == NULL) {
4415 DEBUG(5,("remove_posix_acl: failed to init new ACL with 3 entries for file %s.\n", fname));
4416 return False;
4417 }
4418
4419 /* Now create the u/g/w entries. */
4420 if (sys_acl_create_entry(&new_file_acl, &user_ent) == -1) {
4421 DEBUG(5,("remove_posix_acl: Failed to create user entry for file %s. (%s)\n",
4422 fname, strerror(errno) ));
4423 goto done;
4424 }
4425 if (sys_acl_set_tag_type(user_ent, SMB_ACL_USER_OBJ) == -1) {
4426 DEBUG(5,("remove_posix_acl: Failed to set user entry for file %s. (%s)\n",
4427 fname, strerror(errno) ));
4428 goto done;
4429 }
4430
4431 if (sys_acl_create_entry(&new_file_acl, &group_ent) == -1) {
4432 DEBUG(5,("remove_posix_acl: Failed to create group entry for file %s. (%s)\n",
4433 fname, strerror(errno) ));
4434 goto done;
4435 }
4436 if (sys_acl_set_tag_type(group_ent, SMB_ACL_GROUP_OBJ) == -1) {
4437 DEBUG(5,("remove_posix_acl: Failed to set group entry for file %s. (%s)\n",
4438 fname, strerror(errno) ));
4439 goto done;
4440 }
4441
4442 if (sys_acl_create_entry(&new_file_acl, &other_ent) == -1) {
4443 DEBUG(5,("remove_posix_acl: Failed to create other entry for file %s. (%s)\n",
4444 fname, strerror(errno) ));
4445 goto done;
4446 }
4447 if (sys_acl_set_tag_type(other_ent, SMB_ACL_OTHER) == -1) {
4448 DEBUG(5,("remove_posix_acl: Failed to set other entry for file %s. (%s)\n",
4449 fname, strerror(errno) ));
4450 goto done;
4451 }
4452
4453 /* Get the current file ACL. */
4454 if (fsp && fsp->fh->fd != -1) {
4455 file_acl = SMB_VFS_SYS_ACL_GET_FD(fsp, talloc_tos());
4456 } else {
4457 file_acl = SMB_VFS_SYS_ACL_GET_FILE(conn, fname,
4458 SMB_ACL_TYPE_ACCESS,
4459 talloc_tos());
4460 }
4461
4462 if (file_acl == NULL) {
4463 /* This is only returned if an error occurred. Even for a file with
4464 no acl a u/g/w acl should be returned. */
4465 DEBUG(5,("remove_posix_acl: failed to get ACL from file %s (%s).\n",
4466 fname, strerror(errno) ));
4467 goto done;
4468 }
4469
4470 while ( sys_acl_get_entry(file_acl, entry_id, &entry) == 1) {
4471 SMB_ACL_TAG_T tagtype;
4472 SMB_ACL_PERMSET_T permset;
4473
4474 entry_id = SMB_ACL_NEXT_ENTRY;
4475
4476 if (sys_acl_get_tag_type(entry, &tagtype) == -1) {
4477 DEBUG(5,("remove_posix_acl: failed to get tagtype from ACL on file %s (%s).\n",
4478 fname, strerror(errno) ));
4479 goto done;
4480 }
4481
4482 if (sys_acl_get_permset(entry, &permset) == -1) {
4483 DEBUG(5,("remove_posix_acl: failed to get permset from ACL on file %s (%s).\n",
4484 fname, strerror(errno) ));
4485 goto done;
4486 }
4487
4488 if (tagtype == SMB_ACL_USER_OBJ) {
4489 if (sys_acl_set_permset(user_ent, permset) == -1) {
4490 DEBUG(5,("remove_posix_acl: failed to set permset from ACL on file %s (%s).\n",
4491 fname, strerror(errno) ));
4492 }
4493 } else if (tagtype == SMB_ACL_GROUP_OBJ) {
4494 if (sys_acl_set_permset(group_ent, permset) == -1) {
4495 DEBUG(5,("remove_posix_acl: failed to set permset from ACL on file %s (%s).\n",
4496 fname, strerror(errno) ));
4497 }
4498 } else if (tagtype == SMB_ACL_OTHER) {
4499 if (sys_acl_set_permset(other_ent, permset) == -1) {
4500 DEBUG(5,("remove_posix_acl: failed to set permset from ACL on file %s (%s).\n",
4501 fname, strerror(errno) ));
4502 }
4503 }
4504 }
4505
4506 /* Set the new empty file ACL. */
4507 if (fsp && fsp->fh->fd != -1) {
4508 if (SMB_VFS_SYS_ACL_SET_FD(fsp, new_file_acl) == -1) {
4509 DEBUG(5,("remove_posix_acl: acl_set_file failed on %s (%s)\n",
4510 fname, strerror(errno) ));
4511 goto done;
4512 }
4513 } else {
4514 if (SMB_VFS_SYS_ACL_SET_FILE(conn, fname, SMB_ACL_TYPE_ACCESS, new_file_acl) == -1) {
4515 DEBUG(5,("remove_posix_acl: acl_set_file failed on %s (%s)\n",
4516 fname, strerror(errno) ));
4517 goto done;
4518 }
4519 }
4520
4521 ret = True;
4522
4523 done:
4524
4525 if (file_acl) {
4526 TALLOC_FREE(file_acl);
4527 }
4528 if (new_file_acl) {
4529 TALLOC_FREE(new_file_acl);
4530 }
4531 return ret;
4532 }
4533
4534 /****************************************************************************
4535 Calls from UNIX extensions - POSIX ACL set.
4536 If num_def_acls == 0 then read/modify/write acl after removing all entries
4537 except SMB_ACL_USER_OBJ, SMB_ACL_GROUP_OBJ, SMB_ACL_OTHER.
4538 ****************************************************************************/
4539
4540 bool set_unix_posix_acl(connection_struct *conn, files_struct *fsp, const char *fname, uint16 num_acls, const char *pdata)
4541 {
4542 SMB_ACL_T file_acl = NULL;
4543
4544 if (!num_acls) {
4545 /* Remove the ACL from the file. */
4546 return remove_posix_acl(conn, fsp, fname);
4547 }
4548
4549 if ((file_acl = create_posix_acl_from_wire(conn, num_acls,
4550 pdata,
4551 talloc_tos())) == NULL) {
4552 return False;
4553 }
4554
4555 if (fsp && fsp->fh->fd != -1) {
4556 /* The preferred way - use an open fd. */
4557 if (SMB_VFS_SYS_ACL_SET_FD(fsp, file_acl) == -1) {
4558 DEBUG(5,("set_unix_posix_acl: acl_set_file failed on %s (%s)\n",
4559 fname, strerror(errno) ));
4560 TALLOC_FREE(file_acl);
4561 return False;
4562 }
4563 } else {
4564 if (SMB_VFS_SYS_ACL_SET_FILE(conn, fname, SMB_ACL_TYPE_ACCESS, file_acl) == -1) {
4565 DEBUG(5,("set_unix_posix_acl: acl_set_file failed on %s (%s)\n",
4566 fname, strerror(errno) ));
4567 TALLOC_FREE(file_acl);
4568 return False;
4569 }
4570 }
4571
4572 DEBUG(10,("set_unix_posix_acl: set acl for file %s\n", fname ));
4573 TALLOC_FREE(file_acl);
4574 return True;
4575 }
4576
4577 /********************************************************************
4578 Pull the NT ACL from a file on disk or the OpenEventlog() access
4579 check. Caller is responsible for freeing the returned security
4580 descriptor via TALLOC_FREE(). This is designed for dealing with
4581 user space access checks in smbd outside of the VFS. For example,
4582 checking access rights in OpenEventlog() or from python.
4583
4584 ********************************************************************/
4585
4586 NTSTATUS get_nt_acl_no_snum(TALLOC_CTX *ctx, const char *fname,
4587 uint32 security_info_wanted,
4588 struct security_descriptor **sd)
4589 {
4590 TALLOC_CTX *frame = talloc_stackframe();
4591 connection_struct *conn;
4592 NTSTATUS status = NT_STATUS_OK;
4593
4594 if (!posix_locking_init(false)) {
4595 TALLOC_FREE(frame);
4596 return NT_STATUS_NO_MEMORY;
4597 }
4598
4599 status = create_conn_struct(ctx,
4600 server_event_context(),
4601 server_messaging_context(),
4602 &conn,
4603 -1,
4604 "/",
4605 NULL);
4606
4607 if (!NT_STATUS_IS_OK(status)) {
4608 DEBUG(0,("create_conn_struct returned %s.\n",
4609 nt_errstr(status)));
4610 TALLOC_FREE(frame);
4611 return status;
4612 }
4613
4614 status = SMB_VFS_GET_NT_ACL(conn, fname, security_info_wanted, ctx, sd);
4615 if (!NT_STATUS_IS_OK(status)) {
4616 DEBUG(0, ("get_nt_acl_no_snum: SMB_VFS_GET_NT_ACL returned %s.\n",
4617 nt_errstr(status)));
4618 }
4619
4620 conn_free(conn);
4621 TALLOC_FREE(frame);
4622
4623 return status;
4624 }
4625
4626 /* Stolen shamelessly from pvfs_default_acl() in source4 :-). */
4627
4628 NTSTATUS make_default_filesystem_acl(TALLOC_CTX *ctx,
4629 const char *name,
4630 SMB_STRUCT_STAT *psbuf,
4631 struct security_descriptor **ppdesc)
4632 {
4633 struct dom_sid owner_sid, group_sid;
4634 size_t size = 0;
4635 struct security_ace aces[4];
4636 uint32_t access_mask = 0;
4637 mode_t mode = psbuf->st_ex_mode;
4638 struct security_acl *new_dacl = NULL;
4639 int idx = 0;
4640
4641 DEBUG(10,("make_default_filesystem_acl: file %s mode = 0%o\n",
4642 name, (int)mode ));
4643
4644 uid_to_sid(&owner_sid, psbuf->st_ex_uid);
4645 gid_to_sid(&group_sid, psbuf->st_ex_gid);
4646
4647 /*
4648 We provide up to 4 ACEs
4649 - Owner
4650 - Group
4651 - Everyone
4652 - NT System
4653 */
4654
4655 if (mode & S_IRUSR) {
4656 if (mode & S_IWUSR) {
4657 access_mask |= SEC_RIGHTS_FILE_ALL;
4658 } else {
4659 access_mask |= SEC_RIGHTS_FILE_READ | SEC_FILE_EXECUTE;
4660 }
4661 }
4662 if (mode & S_IWUSR) {
4663 access_mask |= SEC_RIGHTS_FILE_WRITE | SEC_STD_DELETE;
4664 }
4665
4666 init_sec_ace(&aces[idx],
4667 &owner_sid,
4668 SEC_ACE_TYPE_ACCESS_ALLOWED,
4669 access_mask,
4670 0);
4671 idx++;
4672
4673 access_mask = 0;
4674 if (mode & S_IRGRP) {
4675 access_mask |= SEC_RIGHTS_FILE_READ | SEC_FILE_EXECUTE;
4676 }
4677 if (mode & S_IWGRP) {
4678 /* note that delete is not granted - this matches posix behaviour */
4679 access_mask |= SEC_RIGHTS_FILE_WRITE;
4680 }
4681 if (access_mask) {
4682 init_sec_ace(&aces[idx],
4683 &group_sid,
4684 SEC_ACE_TYPE_ACCESS_ALLOWED,
4685 access_mask,
4686 0);
4687 idx++;
4688 }
4689
4690 access_mask = 0;
4691 if (mode & S_IROTH) {
4692 access_mask |= SEC_RIGHTS_FILE_READ | SEC_FILE_EXECUTE;
4693 }
4694 if (mode & S_IWOTH) {
4695 access_mask |= SEC_RIGHTS_FILE_WRITE;
4696 }
4697 if (access_mask) {
4698 init_sec_ace(&aces[idx],
4699 &global_sid_World,
4700 SEC_ACE_TYPE_ACCESS_ALLOWED,
4701 access_mask,
4702 0);
4703 idx++;
4704 }
4705
4706 init_sec_ace(&aces[idx],
4707 &global_sid_System,
4708 SEC_ACE_TYPE_ACCESS_ALLOWED,
4709 SEC_RIGHTS_FILE_ALL,
4710 0);
4711 idx++;
4712
4713 new_dacl = make_sec_acl(ctx,
4714 NT4_ACL_REVISION,
4715 idx,
4716 aces);
4717
4718 if (!new_dacl) {
4719 return NT_STATUS_NO_MEMORY;
4720 }
4721
4722 *ppdesc = make_sec_desc(ctx,
4723 SECURITY_DESCRIPTOR_REVISION_1,
4724 SEC_DESC_SELF_RELATIVE|SEC_DESC_DACL_PRESENT,
4725 &owner_sid,
4726 &group_sid,
4727 NULL,
4728 new_dacl,
4729 &size);
4730 if (!*ppdesc) {
4731 return NT_STATUS_NO_MEMORY;
4732 }
4733 return NT_STATUS_OK;
4734 }
4735
4736 int posix_sys_acl_blob_get_file(vfs_handle_struct *handle,
4737 const char *path_p,
4738 TALLOC_CTX *mem_ctx,
4739 char **blob_description,
4740 DATA_BLOB *blob)
4741 {
4742 int ret;
4743 TALLOC_CTX *frame = talloc_stackframe();
4744 /* Initialise this to zero, in a portable way */
4745 struct smb_acl_wrapper acl_wrapper = {
4746 NULL
4747 };
4748 struct smb_filename *smb_fname;
4749
4750 smb_fname = synthetic_smb_fname_split(frame, path_p, NULL);
4751 if (smb_fname == NULL) {
4752 TALLOC_FREE(frame);
4753 errno = ENOMEM;
4754 return -1;
4755 }
4756
4757 acl_wrapper.access_acl
4758 = smb_vfs_call_sys_acl_get_file(handle,
4759 path_p,
4760 SMB_ACL_TYPE_ACCESS,
4761 frame);
4762
4763 ret = smb_vfs_call_stat(handle, smb_fname);
4764 if (ret == -1) {
4765 TALLOC_FREE(frame);
4766 return -1;
4767 }
4768
4769 if (S_ISDIR(smb_fname->st.st_ex_mode)) {
4770 acl_wrapper.default_acl
4771 = smb_vfs_call_sys_acl_get_file(handle,
4772 path_p,
4773 SMB_ACL_TYPE_DEFAULT,
4774 frame);
4775 }
4776
4777 acl_wrapper.owner = smb_fname->st.st_ex_uid;
4778 acl_wrapper.group = smb_fname->st.st_ex_gid;
4779 acl_wrapper.mode = smb_fname->st.st_ex_mode;
4780
4781 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_push_struct_blob(blob, mem_ctx,
4782 &acl_wrapper,
4783 (ndr_push_flags_fn_t)ndr_push_smb_acl_wrapper))) {
4784 errno = EINVAL;
4785 TALLOC_FREE(frame);
4786 return -1;
4787 }
4788
4789 *blob_description = talloc_strdup(mem_ctx, "posix_acl");
4790 if (!*blob_description) {
4791 errno = EINVAL;
4792 TALLOC_FREE(frame);
4793 return -1;
4794 }
4795
4796 TALLOC_FREE(frame);
4797 return 0;
4798 }
4799
4800 int posix_sys_acl_blob_get_fd(vfs_handle_struct *handle,
4801 files_struct *fsp,
4802 TALLOC_CTX *mem_ctx,
4803 char **blob_description,
4804 DATA_BLOB *blob)
4805 {
4806 SMB_STRUCT_STAT sbuf;
4807 TALLOC_CTX *frame;
4808 struct smb_acl_wrapper acl_wrapper;
4809 int ret;
4810
4811 /* This ensures that we also consider the default ACL */
4812 if (fsp->is_directory || fsp->fh->fd == -1) {
4813 return posix_sys_acl_blob_get_file(handle, fsp->fsp_name->base_name,
4814 mem_ctx, blob_description, blob);
4815 }
4816 frame = talloc_stackframe();
4817
4818 acl_wrapper.default_acl = NULL;
4819
4820 acl_wrapper.access_acl = smb_vfs_call_sys_acl_get_file(handle, fsp->fsp_name->base_name,
4821 SMB_ACL_TYPE_ACCESS, frame);
4822
4823 ret = smb_vfs_call_fstat(handle, fsp, &sbuf);
4824 if (ret == -1) {
4825 TALLOC_FREE(frame);
4826 return -1;
4827 }
4828
4829 acl_wrapper.owner = sbuf.st_ex_uid;
4830 acl_wrapper.group = sbuf.st_ex_gid;
4831 acl_wrapper.mode = sbuf.st_ex_mode;
4832
4833 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_push_struct_blob(blob, mem_ctx,
4834 &acl_wrapper,
4835 (ndr_push_flags_fn_t)ndr_push_smb_acl_wrapper))) {
4836 errno = EINVAL;
4837 TALLOC_FREE(frame);
4838 return -1;
4839 }
4840
4841 *blob_description = talloc_strdup(mem_ctx, "posix_acl");
4842 if (!*blob_description) {
4843 errno = EINVAL;
4844 TALLOC_FREE(frame);
4845 return -1;
4846 }
4847
4848 TALLOC_FREE(frame);
4849 return 0;
4850 }
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