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s3:smbd: fix posix acls when setting an ACL without explicit ACE for the owner (bug...
[Samba/bb.git] / source / smbd / posix_acls.c
blob93bc44be936920ccbc47351680b7c25f9dea5007
1 /*
2 Unix SMB/CIFS implementation.
3 SMB NT Security Descriptor / Unix permission conversion.
4 Copyright (C) Jeremy Allison 1994-2000.
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
24 extern struct current_user current_user;
25 extern const struct generic_mapping file_generic_mapping;
26
27 #undef DBGC_CLASS
28 #define DBGC_CLASS DBGC_ACLS
29
30 /****************************************************************************
31 Data structures representing the internal ACE format.
32 ****************************************************************************/
33
34 enum ace_owner {UID_ACE, GID_ACE, WORLD_ACE};
35 enum ace_attribute {ALLOW_ACE, DENY_ACE}; /* Used for incoming NT ACLS. */
36
37 typedef union posix_id {
38 uid_t uid;
39 gid_t gid;
40 int world;
41 } posix_id;
42
43 typedef struct canon_ace {
44 struct canon_ace *next, *prev;
45 SMB_ACL_TAG_T type;
46 mode_t perms; /* Only use S_I(R|W|X)USR mode bits here. */
47 DOM_SID trustee;
48 enum ace_owner owner_type;
49 enum ace_attribute attr;
50 posix_id unix_ug;
51 bool inherited;
52 } canon_ace;
53
54 #define ALL_ACE_PERMS (S_IRUSR|S_IWUSR|S_IXUSR)
55
56 /*
57 * EA format of user.SAMBA_PAI (Samba_Posix_Acl_Interitance)
58 * attribute on disk.
59 *
60 * | 1 | 1 | 2 | 2 | ....
61 * +------+------+-------------+---------------------+-------------+--------------------+
62 * | vers | flag | num_entries | num_default_entries | ..entries.. | default_entries... |
63 * +------+------+-------------+---------------------+-------------+--------------------+
64 */
65
66 #define PAI_VERSION_OFFSET 0
67 #define PAI_FLAG_OFFSET 1
68 #define PAI_NUM_ENTRIES_OFFSET 2
69 #define PAI_NUM_DEFAULT_ENTRIES_OFFSET 4
70 #define PAI_ENTRIES_BASE 6
71
72 #define PAI_VERSION 1
73 #define PAI_ACL_FLAG_PROTECTED 0x1
74 #define PAI_ENTRY_LENGTH 5
75
76 /*
77 * In memory format of user.SAMBA_PAI attribute.
78 */
79
80 struct pai_entry {
81 struct pai_entry *next, *prev;
82 enum ace_owner owner_type;
83 posix_id unix_ug;
84 };
85
86 struct pai_val {
87 bool pai_protected;
88 unsigned int num_entries;
89 struct pai_entry *entry_list;
90 unsigned int num_def_entries;
91 struct pai_entry *def_entry_list;
92 };
93
94 /************************************************************************
95 Return a uint32 of the pai_entry principal.
96 ************************************************************************/
97
98 static uint32 get_pai_entry_val(struct pai_entry *paie)
99 {
100 switch (paie->owner_type) {
101 case UID_ACE:
102 DEBUG(10,("get_pai_entry_val: uid = %u\n", (unsigned int)paie->unix_ug.uid ));
103 return (uint32)paie->unix_ug.uid;
104 case GID_ACE:
105 DEBUG(10,("get_pai_entry_val: gid = %u\n", (unsigned int)paie->unix_ug.gid ));
106 return (uint32)paie->unix_ug.gid;
107 case WORLD_ACE:
108 default:
109 DEBUG(10,("get_pai_entry_val: world ace\n"));
110 return (uint32)-1;
111 }
112 }
113
114 /************************************************************************
115 Return a uint32 of the entry principal.
116 ************************************************************************/
117
118 static uint32 get_entry_val(canon_ace *ace_entry)
119 {
120 switch (ace_entry->owner_type) {
121 case UID_ACE:
122 DEBUG(10,("get_entry_val: uid = %u\n", (unsigned int)ace_entry->unix_ug.uid ));
123 return (uint32)ace_entry->unix_ug.uid;
124 case GID_ACE:
125 DEBUG(10,("get_entry_val: gid = %u\n", (unsigned int)ace_entry->unix_ug.gid ));
126 return (uint32)ace_entry->unix_ug.gid;
127 case WORLD_ACE:
128 default:
129 DEBUG(10,("get_entry_val: world ace\n"));
130 return (uint32)-1;
131 }
132 }
133
134 /************************************************************************
135 Count the inherited entries.
136 ************************************************************************/
137
138 static unsigned int num_inherited_entries(canon_ace *ace_list)
139 {
140 unsigned int num_entries = 0;
141
142 for (; ace_list; ace_list = ace_list->next)
143 if (ace_list->inherited)
144 num_entries++;
145 return num_entries;
146 }
147
148 /************************************************************************
149 Create the on-disk format. Caller must free.
150 ************************************************************************/
151
152 static char *create_pai_buf(canon_ace *file_ace_list, canon_ace *dir_ace_list, bool pai_protected, size_t *store_size)
153 {
154 char *pai_buf = NULL;
155 canon_ace *ace_list = NULL;
156 char *entry_offset = NULL;
157 unsigned int num_entries = 0;
158 unsigned int num_def_entries = 0;
159
160 for (ace_list = file_ace_list; ace_list; ace_list = ace_list->next)
161 if (ace_list->inherited)
162 num_entries++;
163
164 for (ace_list = dir_ace_list; ace_list; ace_list = ace_list->next)
165 if (ace_list->inherited)
166 num_def_entries++;
167
168 DEBUG(10,("create_pai_buf: num_entries = %u, num_def_entries = %u\n", num_entries, num_def_entries ));
169
170 *store_size = PAI_ENTRIES_BASE + ((num_entries + num_def_entries)*PAI_ENTRY_LENGTH);
171
172 pai_buf = (char *)SMB_MALLOC(*store_size);
173 if (!pai_buf) {
174 return NULL;
175 }
176
177 /* Set up the header. */
178 memset(pai_buf, '\0', PAI_ENTRIES_BASE);
179 SCVAL(pai_buf,PAI_VERSION_OFFSET,PAI_VERSION);
180 SCVAL(pai_buf,PAI_FLAG_OFFSET,(pai_protected ? PAI_ACL_FLAG_PROTECTED : 0));
181 SSVAL(pai_buf,PAI_NUM_ENTRIES_OFFSET,num_entries);
182 SSVAL(pai_buf,PAI_NUM_DEFAULT_ENTRIES_OFFSET,num_def_entries);
183
184 entry_offset = pai_buf + PAI_ENTRIES_BASE;
185
186 for (ace_list = file_ace_list; ace_list; ace_list = ace_list->next) {
187 if (ace_list->inherited) {
188 uint8 type_val = (unsigned char)ace_list->owner_type;
189 uint32 entry_val = get_entry_val(ace_list);
190
191 SCVAL(entry_offset,0,type_val);
192 SIVAL(entry_offset,1,entry_val);
193 entry_offset += PAI_ENTRY_LENGTH;
194 }
195 }
196
197 for (ace_list = dir_ace_list; ace_list; ace_list = ace_list->next) {
198 if (ace_list->inherited) {
199 uint8 type_val = (unsigned char)ace_list->owner_type;
200 uint32 entry_val = get_entry_val(ace_list);
201
202 SCVAL(entry_offset,0,type_val);
203 SIVAL(entry_offset,1,entry_val);
204 entry_offset += PAI_ENTRY_LENGTH;
205 }
206 }
207
208 return pai_buf;
209 }
210
211 /************************************************************************
212 Store the user.SAMBA_PAI attribute on disk.
213 ************************************************************************/
214
215 static void store_inheritance_attributes(files_struct *fsp, canon_ace *file_ace_list,
216 canon_ace *dir_ace_list, bool pai_protected)
217 {
218 int ret;
219 size_t store_size;
220 char *pai_buf;
221
222 if (!lp_map_acl_inherit(SNUM(fsp->conn)))
223 return;
224
225 /*
226 * Don't store if this ACL isn't protected and
227 * none of the entries in it are marked as inherited.
228 */
229
230 if (!pai_protected && num_inherited_entries(file_ace_list) == 0 && num_inherited_entries(dir_ace_list) == 0) {
231 /* Instead just remove the attribute if it exists. */
232 if (fsp->fh->fd != -1)
233 SMB_VFS_FREMOVEXATTR(fsp, SAMBA_POSIX_INHERITANCE_EA_NAME);
234 else
235 SMB_VFS_REMOVEXATTR(fsp->conn, fsp->fsp_name, SAMBA_POSIX_INHERITANCE_EA_NAME);
236 return;
237 }
238
239 pai_buf = create_pai_buf(file_ace_list, dir_ace_list, pai_protected, &store_size);
240
241 if (fsp->fh->fd != -1)
242 ret = SMB_VFS_FSETXATTR(fsp, SAMBA_POSIX_INHERITANCE_EA_NAME,
243 pai_buf, store_size, 0);
244 else
245 ret = SMB_VFS_SETXATTR(fsp->conn,fsp->fsp_name, SAMBA_POSIX_INHERITANCE_EA_NAME,
246 pai_buf, store_size, 0);
247
248 SAFE_FREE(pai_buf);
249
250 DEBUG(10,("store_inheritance_attribute:%s for file %s\n", pai_protected ? " (protected)" : "", fsp->fsp_name));
251 if (ret == -1 && !no_acl_syscall_error(errno))
252 DEBUG(1,("store_inheritance_attribute: Error %s\n", strerror(errno) ));
253 }
254
255 /************************************************************************
256 Delete the in memory inheritance info.
257 ************************************************************************/
258
259 static void free_inherited_info(struct pai_val *pal)
260 {
261 if (pal) {
262 struct pai_entry *paie, *paie_next;
263 for (paie = pal->entry_list; paie; paie = paie_next) {
264 paie_next = paie->next;
265 SAFE_FREE(paie);
266 }
267 for (paie = pal->def_entry_list; paie; paie = paie_next) {
268 paie_next = paie->next;
269 SAFE_FREE(paie);
270 }
271 SAFE_FREE(pal);
272 }
273 }
274
275 /************************************************************************
276 Was this ACL protected ?
277 ************************************************************************/
278
279 static bool get_protected_flag(struct pai_val *pal)
280 {
281 if (!pal)
282 return False;
283 return pal->pai_protected;
284 }
285
286 /************************************************************************
287 Was this ACE inherited ?
288 ************************************************************************/
289
290 static bool get_inherited_flag(struct pai_val *pal, canon_ace *ace_entry, bool default_ace)
291 {
292 struct pai_entry *paie;
293
294 if (!pal)
295 return False;
296
297 /* If the entry exists it is inherited. */
298 for (paie = (default_ace ? pal->def_entry_list : pal->entry_list); paie; paie = paie->next) {
299 if (ace_entry->owner_type == paie->owner_type &&
300 get_entry_val(ace_entry) == get_pai_entry_val(paie))
301 return True;
302 }
303 return False;
304 }
305
306 /************************************************************************
307 Ensure an attribute just read is valid.
308 ************************************************************************/
309
310 static bool check_pai_ok(char *pai_buf, size_t pai_buf_data_size)
311 {
312 uint16 num_entries;
313 uint16 num_def_entries;
314
315 if (pai_buf_data_size < PAI_ENTRIES_BASE) {
316 /* Corrupted - too small. */
317 return False;
318 }
319
320 if (CVAL(pai_buf,PAI_VERSION_OFFSET) != PAI_VERSION)
321 return False;
322
323 num_entries = SVAL(pai_buf,PAI_NUM_ENTRIES_OFFSET);
324 num_def_entries = SVAL(pai_buf,PAI_NUM_DEFAULT_ENTRIES_OFFSET);
325
326 /* Check the entry lists match. */
327 /* Each entry is 5 bytes (type plus 4 bytes of uid or gid). */
328
329 if (((num_entries + num_def_entries)*PAI_ENTRY_LENGTH) + PAI_ENTRIES_BASE != pai_buf_data_size)
330 return False;
331
332 return True;
333 }
334
335
336 /************************************************************************
337 Convert to in-memory format.
338 ************************************************************************/
339
340 static struct pai_val *create_pai_val(char *buf, size_t size)
341 {
342 char *entry_offset;
343 struct pai_val *paiv = NULL;
344 int i;
345
346 if (!check_pai_ok(buf, size))
347 return NULL;
348
349 paiv = SMB_MALLOC_P(struct pai_val);
350 if (!paiv)
351 return NULL;
352
353 memset(paiv, '\0', sizeof(struct pai_val));
354
355 paiv->pai_protected = (CVAL(buf,PAI_FLAG_OFFSET) == PAI_ACL_FLAG_PROTECTED);
356
357 paiv->num_entries = SVAL(buf,PAI_NUM_ENTRIES_OFFSET);
358 paiv->num_def_entries = SVAL(buf,PAI_NUM_DEFAULT_ENTRIES_OFFSET);
359
360 entry_offset = buf + PAI_ENTRIES_BASE;
361
362 DEBUG(10,("create_pai_val:%s num_entries = %u, num_def_entries = %u\n",
363 paiv->pai_protected ? " (pai_protected)" : "", paiv->num_entries, paiv->num_def_entries ));
364
365 for (i = 0; i < paiv->num_entries; i++) {
366 struct pai_entry *paie;
367
368 paie = SMB_MALLOC_P(struct pai_entry);
369 if (!paie) {
370 free_inherited_info(paiv);
371 return NULL;
372 }
373
374 paie->owner_type = (enum ace_owner)CVAL(entry_offset,0);
375 switch( paie->owner_type) {
376 case UID_ACE:
377 paie->unix_ug.uid = (uid_t)IVAL(entry_offset,1);
378 DEBUG(10,("create_pai_val: uid = %u\n", (unsigned int)paie->unix_ug.uid ));
379 break;
380 case GID_ACE:
381 paie->unix_ug.gid = (gid_t)IVAL(entry_offset,1);
382 DEBUG(10,("create_pai_val: gid = %u\n", (unsigned int)paie->unix_ug.gid ));
383 break;
384 case WORLD_ACE:
385 paie->unix_ug.world = -1;
386 DEBUG(10,("create_pai_val: world ace\n"));
387 break;
388 default:
389 free_inherited_info(paiv);
390 return NULL;
391 }
392 entry_offset += PAI_ENTRY_LENGTH;
393 DLIST_ADD(paiv->entry_list, paie);
394 }
395
396 for (i = 0; i < paiv->num_def_entries; i++) {
397 struct pai_entry *paie;
398
399 paie = SMB_MALLOC_P(struct pai_entry);
400 if (!paie) {
401 free_inherited_info(paiv);
402 return NULL;
403 }
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.uid = (uid_t)IVAL(entry_offset,1);
409 DEBUG(10,("create_pai_val: (def) uid = %u\n", (unsigned int)paie->unix_ug.uid ));
410 break;
411 case GID_ACE:
412 paie->unix_ug.gid = (gid_t)IVAL(entry_offset,1);
413 DEBUG(10,("create_pai_val: (def) gid = %u\n", (unsigned int)paie->unix_ug.gid ));
414 break;
415 case WORLD_ACE:
416 paie->unix_ug.world = -1;
417 DEBUG(10,("create_pai_val: (def) world ace\n"));
418 break;
419 default:
420 free_inherited_info(paiv);
421 return NULL;
422 }
423 entry_offset += PAI_ENTRY_LENGTH;
424 DLIST_ADD(paiv->def_entry_list, paie);
425 }
426
427 return paiv;
428 }
429
430 /************************************************************************
431 Load the user.SAMBA_PAI attribute.
432 ************************************************************************/
433
434 static struct pai_val *fload_inherited_info(files_struct *fsp)
435 {
436 char *pai_buf;
437 size_t pai_buf_size = 1024;
438 struct pai_val *paiv = NULL;
439 ssize_t ret;
440
441 if (!lp_map_acl_inherit(SNUM(fsp->conn)))
442 return NULL;
443
444 if ((pai_buf = (char *)SMB_MALLOC(pai_buf_size)) == NULL)
445 return NULL;
446
447 do {
448 if (fsp->fh->fd != -1)
449 ret = SMB_VFS_FGETXATTR(fsp, SAMBA_POSIX_INHERITANCE_EA_NAME,
450 pai_buf, pai_buf_size);
451 else
452 ret = SMB_VFS_GETXATTR(fsp->conn,fsp->fsp_name,SAMBA_POSIX_INHERITANCE_EA_NAME,
453 pai_buf, pai_buf_size);
454
455 if (ret == -1) {
456 if (errno != ERANGE) {
457 break;
458 }
459 /* Buffer too small - enlarge it. */
460 pai_buf_size *= 2;
461 SAFE_FREE(pai_buf);
462 if (pai_buf_size > 1024*1024) {
463 return NULL; /* Limit malloc to 1mb. */
464 }
465 if ((pai_buf = (char *)SMB_MALLOC(pai_buf_size)) == NULL)
466 return NULL;
467 }
468 } while (ret == -1);
469
470 DEBUG(10,("load_inherited_info: ret = %lu for file %s\n", (unsigned long)ret, fsp->fsp_name));
471
472 if (ret == -1) {
473 /* No attribute or not supported. */
474 #if defined(ENOATTR)
475 if (errno != ENOATTR)
476 DEBUG(10,("load_inherited_info: Error %s\n", strerror(errno) ));
477 #else
478 if (errno != ENOSYS)
479 DEBUG(10,("load_inherited_info: Error %s\n", strerror(errno) ));
480 #endif
481 SAFE_FREE(pai_buf);
482 return NULL;
483 }
484
485 paiv = create_pai_val(pai_buf, ret);
486
487 if (paiv && paiv->pai_protected)
488 DEBUG(10,("load_inherited_info: ACL is protected for file %s\n", fsp->fsp_name));
489
490 SAFE_FREE(pai_buf);
491 return paiv;
492 }
493
494 /************************************************************************
495 Load the user.SAMBA_PAI attribute.
496 ************************************************************************/
497
498 static struct pai_val *load_inherited_info(const struct connection_struct *conn,
499 const char *fname)
500 {
501 char *pai_buf;
502 size_t pai_buf_size = 1024;
503 struct pai_val *paiv = NULL;
504 ssize_t ret;
505
506 if (!lp_map_acl_inherit(SNUM(conn))) {
507 return NULL;
508 }
509
510 if ((pai_buf = (char *)SMB_MALLOC(pai_buf_size)) == NULL) {
511 return NULL;
512 }
513
514 do {
515 ret = SMB_VFS_GETXATTR(conn, fname,
516 SAMBA_POSIX_INHERITANCE_EA_NAME,
517 pai_buf, pai_buf_size);
518
519 if (ret == -1) {
520 if (errno != ERANGE) {
521 break;
522 }
523 /* Buffer too small - enlarge it. */
524 pai_buf_size *= 2;
525 SAFE_FREE(pai_buf);
526 if (pai_buf_size > 1024*1024) {
527 return NULL; /* Limit malloc to 1mb. */
528 }
529 if ((pai_buf = (char *)SMB_MALLOC(pai_buf_size)) == NULL)
530 return NULL;
531 }
532 } while (ret == -1);
533
534 DEBUG(10,("load_inherited_info: ret = %lu for file %s\n", (unsigned long)ret, fname));
535
536 if (ret == -1) {
537 /* No attribute or not supported. */
538 #if defined(ENOATTR)
539 if (errno != ENOATTR)
540 DEBUG(10,("load_inherited_info: Error %s\n", strerror(errno) ));
541 #else
542 if (errno != ENOSYS)
543 DEBUG(10,("load_inherited_info: Error %s\n", strerror(errno) ));
544 #endif
545 SAFE_FREE(pai_buf);
546 return NULL;
547 }
548
549 paiv = create_pai_val(pai_buf, ret);
550
551 if (paiv && paiv->pai_protected) {
552 DEBUG(10,("load_inherited_info: ACL is protected for file %s\n", fname));
553 }
554
555 SAFE_FREE(pai_buf);
556 return paiv;
557 }
558
559 /****************************************************************************
560 Functions to manipulate the internal ACE format.
561 ****************************************************************************/
562
563 /****************************************************************************
564 Count a linked list of canonical ACE entries.
565 ****************************************************************************/
566
567 static size_t count_canon_ace_list( canon_ace *l_head )
568 {
569 size_t count = 0;
570 canon_ace *ace;
571
572 for (ace = l_head; ace; ace = ace->next)
573 count++;
574
575 return count;
576 }
577
578 /****************************************************************************
579 Free a linked list of canonical ACE entries.
580 ****************************************************************************/
581
582 static void free_canon_ace_list( canon_ace *l_head )
583 {
584 canon_ace *list, *next;
585
586 for (list = l_head; list; list = next) {
587 next = list->next;
588 DLIST_REMOVE(l_head, list);
589 SAFE_FREE(list);
590 }
591 }
592
593 /****************************************************************************
594 Function to duplicate a canon_ace entry.
595 ****************************************************************************/
596
597 static canon_ace *dup_canon_ace( canon_ace *src_ace)
598 {
599 canon_ace *dst_ace = SMB_MALLOC_P(canon_ace);
600
601 if (dst_ace == NULL)
602 return NULL;
603
604 *dst_ace = *src_ace;
605 dst_ace->prev = dst_ace->next = NULL;
606 return dst_ace;
607 }
608
609 /****************************************************************************
610 Print out a canon ace.
611 ****************************************************************************/
612
613 static void print_canon_ace(canon_ace *pace, int num)
614 {
615 dbgtext( "canon_ace index %d. Type = %s ", num, pace->attr == ALLOW_ACE ? "allow" : "deny" );
616 dbgtext( "SID = %s ", sid_string_dbg(&pace->trustee));
617 if (pace->owner_type == UID_ACE) {
618 const char *u_name = uidtoname(pace->unix_ug.uid);
619 dbgtext( "uid %u (%s) ", (unsigned int)pace->unix_ug.uid, u_name );
620 } else if (pace->owner_type == GID_ACE) {
621 char *g_name = gidtoname(pace->unix_ug.gid);
622 dbgtext( "gid %u (%s) ", (unsigned int)pace->unix_ug.gid, g_name );
623 } else
624 dbgtext( "other ");
625 switch (pace->type) {
626 case SMB_ACL_USER:
627 dbgtext( "SMB_ACL_USER ");
628 break;
629 case SMB_ACL_USER_OBJ:
630 dbgtext( "SMB_ACL_USER_OBJ ");
631 break;
632 case SMB_ACL_GROUP:
633 dbgtext( "SMB_ACL_GROUP ");
634 break;
635 case SMB_ACL_GROUP_OBJ:
636 dbgtext( "SMB_ACL_GROUP_OBJ ");
637 break;
638 case SMB_ACL_OTHER:
639 dbgtext( "SMB_ACL_OTHER ");
640 break;
641 default:
642 dbgtext( "MASK " );
643 break;
644 }
645 if (pace->inherited)
646 dbgtext( "(inherited) ");
647 dbgtext( "perms ");
648 dbgtext( "%c", pace->perms & S_IRUSR ? 'r' : '-');
649 dbgtext( "%c", pace->perms & S_IWUSR ? 'w' : '-');
650 dbgtext( "%c\n", pace->perms & S_IXUSR ? 'x' : '-');
651 }
652
653 /****************************************************************************
654 Print out a canon ace list.
655 ****************************************************************************/
656
657 static void print_canon_ace_list(const char *name, canon_ace *ace_list)
658 {
659 int count = 0;
660
661 if( DEBUGLVL( 10 )) {
662 dbgtext( "print_canon_ace_list: %s\n", name );
663 for (;ace_list; ace_list = ace_list->next, count++)
664 print_canon_ace(ace_list, count );
665 }
666 }
667
668 /****************************************************************************
669 Map POSIX ACL perms to canon_ace permissions (a mode_t containing only S_(R|W|X)USR bits).
670 ****************************************************************************/
671
672 static mode_t convert_permset_to_mode_t(connection_struct *conn, SMB_ACL_PERMSET_T permset)
673 {
674 mode_t ret = 0;
675
676 ret |= (SMB_VFS_SYS_ACL_GET_PERM(conn, permset, SMB_ACL_READ) ? S_IRUSR : 0);
677 ret |= (SMB_VFS_SYS_ACL_GET_PERM(conn, permset, SMB_ACL_WRITE) ? S_IWUSR : 0);
678 ret |= (SMB_VFS_SYS_ACL_GET_PERM(conn, permset, SMB_ACL_EXECUTE) ? S_IXUSR : 0);
679
680 return ret;
681 }
682
683 /****************************************************************************
684 Map generic UNIX permissions to canon_ace permissions (a mode_t containing only S_(R|W|X)USR bits).
685 ****************************************************************************/
686
687 static mode_t unix_perms_to_acl_perms(mode_t mode, int r_mask, int w_mask, int x_mask)
688 {
689 mode_t ret = 0;
690
691 if (mode & r_mask)
692 ret |= S_IRUSR;
693 if (mode & w_mask)
694 ret |= S_IWUSR;
695 if (mode & x_mask)
696 ret |= S_IXUSR;
697
698 return ret;
699 }
700
701 /****************************************************************************
702 Map canon_ace permissions (a mode_t containing only S_(R|W|X)USR bits) to
703 an SMB_ACL_PERMSET_T.
704 ****************************************************************************/
705
706 static int map_acl_perms_to_permset(connection_struct *conn, mode_t mode, SMB_ACL_PERMSET_T *p_permset)
707 {
708 if (SMB_VFS_SYS_ACL_CLEAR_PERMS(conn, *p_permset) == -1)
709 return -1;
710 if (mode & S_IRUSR) {
711 if (SMB_VFS_SYS_ACL_ADD_PERM(conn, *p_permset, SMB_ACL_READ) == -1)
712 return -1;
713 }
714 if (mode & S_IWUSR) {
715 if (SMB_VFS_SYS_ACL_ADD_PERM(conn, *p_permset, SMB_ACL_WRITE) == -1)
716 return -1;
717 }
718 if (mode & S_IXUSR) {
719 if (SMB_VFS_SYS_ACL_ADD_PERM(conn, *p_permset, SMB_ACL_EXECUTE) == -1)
720 return -1;
721 }
722 return 0;
723 }
724
725 /****************************************************************************
726 Function to create owner and group SIDs from a SMB_STRUCT_STAT.
727 ****************************************************************************/
728
729 void create_file_sids(const SMB_STRUCT_STAT *psbuf, DOM_SID *powner_sid, DOM_SID *pgroup_sid)
730 {
731 uid_to_sid( powner_sid, psbuf->st_uid );
732 gid_to_sid( pgroup_sid, psbuf->st_gid );
733 }
734
735 /****************************************************************************
736 Is the identity in two ACEs equal ? Check both SID and uid/gid.
737 ****************************************************************************/
738
739 static bool identity_in_ace_equal(canon_ace *ace1, canon_ace *ace2)
740 {
741 if (sid_equal(&ace1->trustee, &ace2->trustee)) {
742 return True;
743 }
744 if (ace1->owner_type == ace2->owner_type) {
745 if (ace1->owner_type == UID_ACE &&
746 ace1->unix_ug.uid == ace2->unix_ug.uid) {
747 return True;
748 } else if (ace1->owner_type == GID_ACE &&
749 ace1->unix_ug.gid == ace2->unix_ug.gid) {
750 return True;
751 }
752 }
753 return False;
754 }
755
756 /****************************************************************************
757 Merge aces with a common sid - if both are allow or deny, OR the permissions together and
758 delete the second one. If the first is deny, mask the permissions off and delete the allow
759 if the permissions become zero, delete the deny if the permissions are non zero.
760 ****************************************************************************/
761
762 static void merge_aces( canon_ace **pp_list_head )
763 {
764 canon_ace *l_head = *pp_list_head;
765 canon_ace *curr_ace_outer;
766 canon_ace *curr_ace_outer_next;
767
768 /*
769 * First, merge allow entries with identical SIDs, and deny entries
770 * with identical SIDs.
771 */
772
773 for (curr_ace_outer = l_head; curr_ace_outer; curr_ace_outer = curr_ace_outer_next) {
774 canon_ace *curr_ace;
775 canon_ace *curr_ace_next;
776
777 curr_ace_outer_next = curr_ace_outer->next; /* Save the link in case we delete. */
778
779 for (curr_ace = curr_ace_outer->next; curr_ace; curr_ace = curr_ace_next) {
780
781 curr_ace_next = curr_ace->next; /* Save the link in case of delete. */
782
783 if (identity_in_ace_equal(curr_ace, curr_ace_outer) &&
784 (curr_ace->attr == curr_ace_outer->attr)) {
785
786 if( DEBUGLVL( 10 )) {
787 dbgtext("merge_aces: Merging ACE's\n");
788 print_canon_ace( curr_ace_outer, 0);
789 print_canon_ace( curr_ace, 0);
790 }
791
792 /* Merge two allow or two deny ACE's. */
793
794 curr_ace_outer->perms |= curr_ace->perms;
795 DLIST_REMOVE(l_head, curr_ace);
796 SAFE_FREE(curr_ace);
797 curr_ace_outer_next = curr_ace_outer->next; /* We may have deleted the link. */
798 }
799 }
800 }
801
802 /*
803 * Now go through and mask off allow permissions with deny permissions.
804 * We can delete either the allow or deny here as we know that each SID
805 * appears only once in the list.
806 */
807
808 for (curr_ace_outer = l_head; curr_ace_outer; curr_ace_outer = curr_ace_outer_next) {
809 canon_ace *curr_ace;
810 canon_ace *curr_ace_next;
811
812 curr_ace_outer_next = curr_ace_outer->next; /* Save the link in case we delete. */
813
814 for (curr_ace = curr_ace_outer->next; curr_ace; curr_ace = curr_ace_next) {
815
816 curr_ace_next = curr_ace->next; /* Save the link in case of delete. */
817
818 /*
819 * Subtract ACE's with different entries. Due to the ordering constraints
820 * we've put on the ACL, we know the deny must be the first one.
821 */
822
823 if (identity_in_ace_equal(curr_ace, curr_ace_outer) &&
824 (curr_ace_outer->attr == DENY_ACE) && (curr_ace->attr == ALLOW_ACE)) {
825
826 if( DEBUGLVL( 10 )) {
827 dbgtext("merge_aces: Masking ACE's\n");
828 print_canon_ace( curr_ace_outer, 0);
829 print_canon_ace( curr_ace, 0);
830 }
831
832 curr_ace->perms &= ~curr_ace_outer->perms;
833
834 if (curr_ace->perms == 0) {
835
836 /*
837 * The deny overrides the allow. Remove the allow.
838 */
839
840 DLIST_REMOVE(l_head, curr_ace);
841 SAFE_FREE(curr_ace);
842 curr_ace_outer_next = curr_ace_outer->next; /* We may have deleted the link. */
843
844 } else {
845
846 /*
847 * Even after removing permissions, there
848 * are still allow permissions - delete the deny.
849 * It is safe to delete the deny here,
850 * as we are guarenteed by the deny first
851 * ordering that all the deny entries for
852 * this SID have already been merged into one
853 * before we can get to an allow ace.
854 */
855
856 DLIST_REMOVE(l_head, curr_ace_outer);
857 SAFE_FREE(curr_ace_outer);
858 break;
859 }
860 }
861
862 } /* end for curr_ace */
863 } /* end for curr_ace_outer */
864
865 /* We may have modified the list. */
866
867 *pp_list_head = l_head;
868 }
869
870 /****************************************************************************
871 Check if we need to return NT4.x compatible ACL entries.
872 ****************************************************************************/
873
874 static bool nt4_compatible_acls(void)
875 {
876 int compat = lp_acl_compatibility();
877
878 if (compat == ACL_COMPAT_AUTO) {
879 enum remote_arch_types ra_type = get_remote_arch();
880
881 /* Automatically adapt to client */
882 return (ra_type <= RA_WINNT);
883 } else
884 return (compat == ACL_COMPAT_WINNT);
885 }
886
887
888 /****************************************************************************
889 Map canon_ace perms to permission bits NT.
890 The attr element is not used here - we only process deny entries on set,
891 not get. Deny entries are implicit on get with ace->perms = 0.
892 ****************************************************************************/
893
894 static uint32_t map_canon_ace_perms(int snum,
895 enum security_ace_type *pacl_type,
896 mode_t perms,
897 bool directory_ace)
898 {
899 uint32_t nt_mask = 0;
900
901 *pacl_type = SEC_ACE_TYPE_ACCESS_ALLOWED;
902
903 if (lp_acl_map_full_control(snum) && ((perms & ALL_ACE_PERMS) == ALL_ACE_PERMS)) {
904 if (directory_ace) {
905 nt_mask = UNIX_DIRECTORY_ACCESS_RWX;
906 } else {
907 nt_mask = (UNIX_ACCESS_RWX & ~DELETE_ACCESS);
908 }
909 } else if ((perms & ALL_ACE_PERMS) == (mode_t)0) {
910 /*
911 * Windows NT refuses to display ACEs with no permissions in them (but
912 * they are perfectly legal with Windows 2000). If the ACE has empty
913 * permissions we cannot use 0, so we use the otherwise unused
914 * WRITE_OWNER permission, which we ignore when we set an ACL.
915 * We abstract this into a #define of UNIX_ACCESS_NONE to allow this
916 * to be changed in the future.
917 */
918
919 if (nt4_compatible_acls())
920 nt_mask = UNIX_ACCESS_NONE;
921 else
922 nt_mask = 0;
923 } else {
924 if (directory_ace) {
925 nt_mask |= ((perms & S_IRUSR) ? UNIX_DIRECTORY_ACCESS_R : 0 );
926 nt_mask |= ((perms & S_IWUSR) ? UNIX_DIRECTORY_ACCESS_W : 0 );
927 nt_mask |= ((perms & S_IXUSR) ? UNIX_DIRECTORY_ACCESS_X : 0 );
928 } else {
929 nt_mask |= ((perms & S_IRUSR) ? UNIX_ACCESS_R : 0 );
930 nt_mask |= ((perms & S_IWUSR) ? UNIX_ACCESS_W : 0 );
931 nt_mask |= ((perms & S_IXUSR) ? UNIX_ACCESS_X : 0 );
932 }
933 }
934
935 DEBUG(10,("map_canon_ace_perms: Mapped (UNIX) %x to (NT) %x\n",
936 (unsigned int)perms, (unsigned int)nt_mask ));
937
938 return nt_mask;
939 }
940
941 /****************************************************************************
942 Map NT perms to a UNIX mode_t.
943 ****************************************************************************/
944
945 #define FILE_SPECIFIC_READ_BITS (FILE_READ_DATA|FILE_READ_EA|FILE_READ_ATTRIBUTES)
946 #define FILE_SPECIFIC_WRITE_BITS (FILE_WRITE_DATA|FILE_APPEND_DATA|FILE_WRITE_EA|FILE_WRITE_ATTRIBUTES)
947 #define FILE_SPECIFIC_EXECUTE_BITS (FILE_EXECUTE)
948
949 static mode_t map_nt_perms( uint32 *mask, int type)
950 {
951 mode_t mode = 0;
952
953 switch(type) {
954 case S_IRUSR:
955 if((*mask) & GENERIC_ALL_ACCESS)
956 mode = S_IRUSR|S_IWUSR|S_IXUSR;
957 else {
958 mode |= ((*mask) & (GENERIC_READ_ACCESS|FILE_SPECIFIC_READ_BITS)) ? S_IRUSR : 0;
959 mode |= ((*mask) & (GENERIC_WRITE_ACCESS|FILE_SPECIFIC_WRITE_BITS)) ? S_IWUSR : 0;
960 mode |= ((*mask) & (GENERIC_EXECUTE_ACCESS|FILE_SPECIFIC_EXECUTE_BITS)) ? S_IXUSR : 0;
961 }
962 break;
963 case S_IRGRP:
964 if((*mask) & GENERIC_ALL_ACCESS)
965 mode = S_IRGRP|S_IWGRP|S_IXGRP;
966 else {
967 mode |= ((*mask) & (GENERIC_READ_ACCESS|FILE_SPECIFIC_READ_BITS)) ? S_IRGRP : 0;
968 mode |= ((*mask) & (GENERIC_WRITE_ACCESS|FILE_SPECIFIC_WRITE_BITS)) ? S_IWGRP : 0;
969 mode |= ((*mask) & (GENERIC_EXECUTE_ACCESS|FILE_SPECIFIC_EXECUTE_BITS)) ? S_IXGRP : 0;
970 }
971 break;
972 case S_IROTH:
973 if((*mask) & GENERIC_ALL_ACCESS)
974 mode = S_IROTH|S_IWOTH|S_IXOTH;
975 else {
976 mode |= ((*mask) & (GENERIC_READ_ACCESS|FILE_SPECIFIC_READ_BITS)) ? S_IROTH : 0;
977 mode |= ((*mask) & (GENERIC_WRITE_ACCESS|FILE_SPECIFIC_WRITE_BITS)) ? S_IWOTH : 0;
978 mode |= ((*mask) & (GENERIC_EXECUTE_ACCESS|FILE_SPECIFIC_EXECUTE_BITS)) ? S_IXOTH : 0;
979 }
980 break;
981 }
982
983 return mode;
984 }
985
986 /****************************************************************************
987 Unpack a SEC_DESC into a UNIX owner and group.
988 ****************************************************************************/
989
990 NTSTATUS unpack_nt_owners(int snum, uid_t *puser, gid_t *pgrp, uint32 security_info_sent, const SEC_DESC *psd)
991 {
992 DOM_SID owner_sid;
993 DOM_SID grp_sid;
994
995 *puser = (uid_t)-1;
996 *pgrp = (gid_t)-1;
997
998 if(security_info_sent == 0) {
999 DEBUG(0,("unpack_nt_owners: no security info sent !\n"));
1000 return NT_STATUS_OK;
1001 }
1002
1003 /*
1004 * Validate the owner and group SID's.
1005 */
1006
1007 memset(&owner_sid, '\0', sizeof(owner_sid));
1008 memset(&grp_sid, '\0', sizeof(grp_sid));
1009
1010 DEBUG(5,("unpack_nt_owners: validating owner_sids.\n"));
1011
1012 /*
1013 * Don't immediately fail if the owner sid cannot be validated.
1014 * This may be a group chown only set.
1015 */
1016
1017 if (security_info_sent & OWNER_SECURITY_INFORMATION) {
1018 sid_copy(&owner_sid, psd->owner_sid);
1019 if (!sid_to_uid(&owner_sid, puser)) {
1020 if (lp_force_unknown_acl_user(snum)) {
1021 /* this allows take ownership to work
1022 * reasonably */
1023 *puser = current_user.ut.uid;
1024 } else {
1025 DEBUG(3,("unpack_nt_owners: unable to validate"
1026 " owner sid for %s\n",
1027 sid_string_dbg(&owner_sid)));
1028 return NT_STATUS_INVALID_OWNER;
1029 }
1030 }
1031 DEBUG(3,("unpack_nt_owners: owner sid mapped to uid %u\n",
1032 (unsigned int)*puser ));
1033 }
1034
1035 /*
1036 * Don't immediately fail if the group sid cannot be validated.
1037 * This may be an owner chown only set.
1038 */
1039
1040 if (security_info_sent & GROUP_SECURITY_INFORMATION) {
1041 sid_copy(&grp_sid, psd->group_sid);
1042 if (!sid_to_gid( &grp_sid, pgrp)) {
1043 if (lp_force_unknown_acl_user(snum)) {
1044 /* this allows take group ownership to work
1045 * reasonably */
1046 *pgrp = current_user.ut.gid;
1047 } else {
1048 DEBUG(3,("unpack_nt_owners: unable to validate"
1049 " group sid.\n"));
1050 return NT_STATUS_INVALID_OWNER;
1051 }
1052 }
1053 DEBUG(3,("unpack_nt_owners: group sid mapped to gid %u\n",
1054 (unsigned int)*pgrp));
1055 }
1056
1057 DEBUG(5,("unpack_nt_owners: owner_sids validated.\n"));
1058
1059 return NT_STATUS_OK;
1060 }
1061
1062 /****************************************************************************
1063 Ensure the enforced permissions for this share apply.
1064 ****************************************************************************/
1065
1066 static void apply_default_perms(const struct share_params *params,
1067 const bool is_directory, canon_ace *pace,
1068 mode_t type)
1069 {
1070 mode_t and_bits = (mode_t)0;
1071 mode_t or_bits = (mode_t)0;
1072
1073 /* Get the initial bits to apply. */
1074
1075 if (is_directory) {
1076 and_bits = lp_dir_security_mask(params->service);
1077 or_bits = lp_force_dir_security_mode(params->service);
1078 } else {
1079 and_bits = lp_security_mask(params->service);
1080 or_bits = lp_force_security_mode(params->service);
1081 }
1082
1083 /* Now bounce them into the S_USR space. */
1084 switch(type) {
1085 case S_IRUSR:
1086 /* Ensure owner has read access. */
1087 pace->perms |= S_IRUSR;
1088 if (is_directory)
1089 pace->perms |= (S_IWUSR|S_IXUSR);
1090 and_bits = unix_perms_to_acl_perms(and_bits, S_IRUSR, S_IWUSR, S_IXUSR);
1091 or_bits = unix_perms_to_acl_perms(or_bits, S_IRUSR, S_IWUSR, S_IXUSR);
1092 break;
1093 case S_IRGRP:
1094 and_bits = unix_perms_to_acl_perms(and_bits, S_IRGRP, S_IWGRP, S_IXGRP);
1095 or_bits = unix_perms_to_acl_perms(or_bits, S_IRGRP, S_IWGRP, S_IXGRP);
1096 break;
1097 case S_IROTH:
1098 and_bits = unix_perms_to_acl_perms(and_bits, S_IROTH, S_IWOTH, S_IXOTH);
1099 or_bits = unix_perms_to_acl_perms(or_bits, S_IROTH, S_IWOTH, S_IXOTH);
1100 break;
1101 }
1102
1103 pace->perms = ((pace->perms & and_bits)|or_bits);
1104 }
1105
1106 /****************************************************************************
1107 Check if a given uid/SID is in a group gid/SID. This is probably very
1108 expensive and will need optimisation. A *lot* of optimisation :-). JRA.
1109 ****************************************************************************/
1110
1111 static bool uid_entry_in_group( canon_ace *uid_ace, canon_ace *group_ace )
1112 {
1113 const char *u_name = NULL;
1114
1115 /* "Everyone" always matches every uid. */
1116
1117 if (sid_equal(&group_ace->trustee, &global_sid_World))
1118 return True;
1119
1120 /*
1121 * if it's the current user, we already have the unix token
1122 * and don't need to do the complex user_in_group_sid() call
1123 */
1124 if (uid_ace->unix_ug.uid == current_user.ut.uid) {
1125 size_t i;
1126
1127 if (group_ace->unix_ug.gid == current_user.ut.gid) {
1128 return True;
1129 }
1130
1131 for (i=0; i < current_user.ut.ngroups; i++) {
1132 if (group_ace->unix_ug.gid == current_user.ut.groups[i]) {
1133 return True;
1134 }
1135 }
1136 }
1137
1138 /* u_name talloc'ed off tos. */
1139 u_name = uidtoname(uid_ace->unix_ug.uid);
1140 if (!u_name) {
1141 return False;
1142 }
1143
1144 /* notice that this is not reliable for users exported by winbindd! */
1145 return user_in_group_sid(u_name, &group_ace->trustee);
1146 }
1147
1148 /****************************************************************************
1149 A well formed POSIX file or default ACL has at least 3 entries, a
1150 SMB_ACL_USER_OBJ, SMB_ACL_GROUP_OBJ, SMB_ACL_OTHER_OBJ.
1151 In addition, the owner must always have at least read access.
1152 When using this call on get_acl, the pst struct is valid and contains
1153 the mode of the file. When using this call on set_acl, the pst struct has
1154 been modified to have a mode containing the default for this file or directory
1155 type.
1156 ****************************************************************************/
1157
1158 static bool ensure_canon_entry_valid(canon_ace **pp_ace,
1159 const struct share_params *params,
1160 const bool is_directory,
1161 const DOM_SID *pfile_owner_sid,
1162 const DOM_SID *pfile_grp_sid,
1163 const SMB_STRUCT_STAT *pst,
1164 bool setting_acl)
1165 {
1166 canon_ace *pace;
1167 bool got_user = False;
1168 bool got_grp = False;
1169 bool got_other = False;
1170 canon_ace *pace_other = NULL;
1171
1172 for (pace = *pp_ace; pace; pace = pace->next) {
1173 if (pace->type == SMB_ACL_USER_OBJ) {
1174
1175 if (setting_acl)
1176 apply_default_perms(params, is_directory, pace, S_IRUSR);
1177 got_user = True;
1178
1179 } else if (pace->type == SMB_ACL_GROUP_OBJ) {
1180
1181 /*
1182 * Ensure create mask/force create mode is respected on set.
1183 */
1184
1185 if (setting_acl)
1186 apply_default_perms(params, is_directory, pace, S_IRGRP);
1187 got_grp = True;
1188
1189 } else if (pace->type == SMB_ACL_OTHER) {
1190
1191 /*
1192 * Ensure create mask/force create mode is respected on set.
1193 */
1194
1195 if (setting_acl)
1196 apply_default_perms(params, is_directory, pace, S_IROTH);
1197 got_other = True;
1198 pace_other = pace;
1199 }
1200 }
1201
1202 if (!got_user) {
1203 if ((pace = SMB_MALLOC_P(canon_ace)) == NULL) {
1204 DEBUG(0,("ensure_canon_entry_valid: malloc fail.\n"));
1205 return False;
1206 }
1207
1208 ZERO_STRUCTP(pace);
1209 pace->type = SMB_ACL_USER_OBJ;
1210 pace->owner_type = UID_ACE;
1211 pace->unix_ug.uid = pst->st_uid;
1212 pace->trustee = *pfile_owner_sid;
1213 pace->attr = ALLOW_ACE;
1214
1215 if (setting_acl) {
1216 /* See if the owning user is in any of the other groups in
1217 the ACE. If so, OR in the permissions from that group. */
1218
1219 bool group_matched = False;
1220 canon_ace *pace_iter;
1221
1222 for (pace_iter = *pp_ace; pace_iter; pace_iter = pace_iter->next) {
1223 if (pace_iter->type == SMB_ACL_GROUP_OBJ || pace_iter->type == SMB_ACL_GROUP) {
1224 if (uid_entry_in_group(pace, pace_iter)) {
1225 pace->perms |= pace_iter->perms;
1226 group_matched = True;
1227 }
1228 }
1229 }
1230
1231 /* If we only got an "everyone" perm, just use that. */
1232 if (!group_matched) {
1233 if (got_other)
1234 pace->perms = pace_other->perms;
1235 else
1236 pace->perms = 0;
1237 }
1238
1239 apply_default_perms(params, is_directory, pace, S_IRUSR);
1240 } else {
1241 pace->perms = unix_perms_to_acl_perms(pst->st_mode, S_IRUSR, S_IWUSR, S_IXUSR);
1242 }
1243
1244 DLIST_ADD(*pp_ace, pace);
1245 }
1246
1247 if (!got_grp) {
1248 if ((pace = SMB_MALLOC_P(canon_ace)) == NULL) {
1249 DEBUG(0,("ensure_canon_entry_valid: malloc fail.\n"));
1250 return False;
1251 }
1252
1253 ZERO_STRUCTP(pace);
1254 pace->type = SMB_ACL_GROUP_OBJ;
1255 pace->owner_type = GID_ACE;
1256 pace->unix_ug.uid = pst->st_gid;
1257 pace->trustee = *pfile_grp_sid;
1258 pace->attr = ALLOW_ACE;
1259 if (setting_acl) {
1260 /* If we only got an "everyone" perm, just use that. */
1261 if (got_other)
1262 pace->perms = pace_other->perms;
1263 else
1264 pace->perms = 0;
1265 apply_default_perms(params, is_directory, pace, S_IRGRP);
1266 } else {
1267 pace->perms = unix_perms_to_acl_perms(pst->st_mode, S_IRGRP, S_IWGRP, S_IXGRP);
1268 }
1269
1270 DLIST_ADD(*pp_ace, pace);
1271 }
1272
1273 if (!got_other) {
1274 if ((pace = SMB_MALLOC_P(canon_ace)) == NULL) {
1275 DEBUG(0,("ensure_canon_entry_valid: malloc fail.\n"));
1276 return False;
1277 }
1278
1279 ZERO_STRUCTP(pace);
1280 pace->type = SMB_ACL_OTHER;
1281 pace->owner_type = WORLD_ACE;
1282 pace->unix_ug.world = -1;
1283 pace->trustee = global_sid_World;
1284 pace->attr = ALLOW_ACE;
1285 if (setting_acl) {
1286 pace->perms = 0;
1287 apply_default_perms(params, is_directory, pace, S_IROTH);
1288 } else
1289 pace->perms = unix_perms_to_acl_perms(pst->st_mode, S_IROTH, S_IWOTH, S_IXOTH);
1290
1291 DLIST_ADD(*pp_ace, pace);
1292 }
1293
1294 return True;
1295 }
1296
1297 /****************************************************************************
1298 Check if a POSIX ACL has the required SMB_ACL_USER_OBJ and SMB_ACL_GROUP_OBJ entries.
1299 If it does not have them, check if there are any entries where the trustee is the
1300 file owner or the owning group, and map these to SMB_ACL_USER_OBJ and SMB_ACL_GROUP_OBJ.
1301 ****************************************************************************/
1302
1303 static void check_owning_objs(canon_ace *ace, DOM_SID *pfile_owner_sid, DOM_SID *pfile_grp_sid)
1304 {
1305 bool got_user_obj, got_group_obj;
1306 canon_ace *current_ace;
1307 int i, entries;
1308
1309 entries = count_canon_ace_list(ace);
1310 got_user_obj = False;
1311 got_group_obj = False;
1312
1313 for (i=0, current_ace = ace; i < entries; i++, current_ace = current_ace->next) {
1314 if (current_ace->type == SMB_ACL_USER_OBJ)
1315 got_user_obj = True;
1316 else if (current_ace->type == SMB_ACL_GROUP_OBJ)
1317 got_group_obj = True;
1318 }
1319 if (got_user_obj && got_group_obj) {
1320 DEBUG(10,("check_owning_objs: ACL had owning user/group entries.\n"));
1321 return;
1322 }
1323
1324 for (i=0, current_ace = ace; i < entries; i++, current_ace = current_ace->next) {
1325 if (!got_user_obj && current_ace->owner_type == UID_ACE &&
1326 sid_equal(&current_ace->trustee, pfile_owner_sid)) {
1327 current_ace->type = SMB_ACL_USER_OBJ;
1328 got_user_obj = True;
1329 }
1330 if (!got_group_obj && current_ace->owner_type == GID_ACE &&
1331 sid_equal(&current_ace->trustee, pfile_grp_sid)) {
1332 current_ace->type = SMB_ACL_GROUP_OBJ;
1333 got_group_obj = True;
1334 }
1335 }
1336 if (!got_user_obj)
1337 DEBUG(10,("check_owning_objs: ACL is missing an owner entry.\n"));
1338 if (!got_group_obj)
1339 DEBUG(10,("check_owning_objs: ACL is missing an owning group entry.\n"));
1340 }
1341
1342 /****************************************************************************
1343 Unpack a SEC_DESC into two canonical ace lists.
1344 ****************************************************************************/
1345
1346 static bool create_canon_ace_lists(files_struct *fsp,
1347 SMB_STRUCT_STAT *pst,
1348 DOM_SID *pfile_owner_sid,
1349 DOM_SID *pfile_grp_sid,
1350 canon_ace **ppfile_ace,
1351 canon_ace **ppdir_ace,
1352 const SEC_ACL *dacl)
1353 {
1354 bool all_aces_are_inherit_only = (fsp->is_directory ? True : False);
1355 canon_ace *file_ace = NULL;
1356 canon_ace *dir_ace = NULL;
1357 canon_ace *current_ace = NULL;
1358 bool got_dir_allow = False;
1359 bool got_file_allow = False;
1360 int i, j;
1361
1362 *ppfile_ace = NULL;
1363 *ppdir_ace = NULL;
1364
1365 /*
1366 * Convert the incoming ACL into a more regular form.
1367 */
1368
1369 for(i = 0; i < dacl->num_aces; i++) {
1370 SEC_ACE *psa = &dacl->aces[i];
1371
1372 if((psa->type != SEC_ACE_TYPE_ACCESS_ALLOWED) && (psa->type != SEC_ACE_TYPE_ACCESS_DENIED)) {
1373 DEBUG(3,("create_canon_ace_lists: unable to set anything but an ALLOW or DENY ACE.\n"));
1374 return False;
1375 }
1376
1377 if (nt4_compatible_acls()) {
1378 /*
1379 * The security mask may be UNIX_ACCESS_NONE which should map into
1380 * no permissions (we overload the WRITE_OWNER bit for this) or it
1381 * should be one of the ALL/EXECUTE/READ/WRITE bits. Arrange for this
1382 * to be so. Any other bits override the UNIX_ACCESS_NONE bit.
1383 */
1384
1385 /*
1386 * Convert GENERIC bits to specific bits.
1387 */
1388
1389 se_map_generic(&psa->access_mask, &file_generic_mapping);
1390
1391 psa->access_mask &= (UNIX_ACCESS_NONE|FILE_ALL_ACCESS);
1392
1393 if(psa->access_mask != UNIX_ACCESS_NONE)
1394 psa->access_mask &= ~UNIX_ACCESS_NONE;
1395 }
1396 }
1397
1398 /*
1399 * Deal with the fact that NT 4.x re-writes the canonical format
1400 * that we return for default ACLs. If a directory ACE is identical
1401 * to a inherited directory ACE then NT changes the bits so that the
1402 * first ACE is set to OI|IO and the second ACE for this SID is set
1403 * to CI. We need to repair this. JRA.
1404 */
1405
1406 for(i = 0; i < dacl->num_aces; i++) {
1407 SEC_ACE *psa1 = &dacl->aces[i];
1408
1409 for (j = i + 1; j < dacl->num_aces; j++) {
1410 SEC_ACE *psa2 = &dacl->aces[j];
1411
1412 if (psa1->access_mask != psa2->access_mask)
1413 continue;
1414
1415 if (!sid_equal(&psa1->trustee, &psa2->trustee))
1416 continue;
1417
1418 /*
1419 * Ok - permission bits and SIDs are equal.
1420 * Check if flags were re-written.
1421 */
1422
1423 if (psa1->flags & SEC_ACE_FLAG_INHERIT_ONLY) {
1424
1425 psa1->flags |= (psa2->flags & (SEC_ACE_FLAG_CONTAINER_INHERIT|SEC_ACE_FLAG_OBJECT_INHERIT));
1426 psa2->flags &= ~(SEC_ACE_FLAG_CONTAINER_INHERIT|SEC_ACE_FLAG_OBJECT_INHERIT);
1427
1428 } else if (psa2->flags & SEC_ACE_FLAG_INHERIT_ONLY) {
1429
1430 psa2->flags |= (psa1->flags & (SEC_ACE_FLAG_CONTAINER_INHERIT|SEC_ACE_FLAG_OBJECT_INHERIT));
1431 psa1->flags &= ~(SEC_ACE_FLAG_CONTAINER_INHERIT|SEC_ACE_FLAG_OBJECT_INHERIT);
1432
1433 }
1434 }
1435 }
1436
1437 for(i = 0; i < dacl->num_aces; i++) {
1438 SEC_ACE *psa = &dacl->aces[i];
1439
1440 /*
1441 * Create a cannon_ace entry representing this NT DACL ACE.
1442 */
1443
1444 if ((current_ace = SMB_MALLOC_P(canon_ace)) == NULL) {
1445 free_canon_ace_list(file_ace);
1446 free_canon_ace_list(dir_ace);
1447 DEBUG(0,("create_canon_ace_lists: malloc fail.\n"));
1448 return False;
1449 }
1450
1451 ZERO_STRUCTP(current_ace);
1452
1453 sid_copy(&current_ace->trustee, &psa->trustee);
1454
1455 /*
1456 * Try and work out if the SID is a user or group
1457 * as we need to flag these differently for POSIX.
1458 * Note what kind of a POSIX ACL this should map to.
1459 */
1460
1461 if( sid_equal(&current_ace->trustee, &global_sid_World)) {
1462 current_ace->owner_type = WORLD_ACE;
1463 current_ace->unix_ug.world = -1;
1464 current_ace->type = SMB_ACL_OTHER;
1465 } else if (sid_equal(&current_ace->trustee, &global_sid_Creator_Owner)) {
1466 current_ace->owner_type = UID_ACE;
1467 current_ace->unix_ug.uid = pst->st_uid;
1468 current_ace->type = SMB_ACL_USER_OBJ;
1469
1470 /*
1471 * The Creator Owner entry only specifies inheritable permissions,
1472 * never access permissions. WinNT doesn't always set the ACE to
1473 *INHERIT_ONLY, though.
1474 */
1475
1476 if (nt4_compatible_acls())
1477 psa->flags |= SEC_ACE_FLAG_INHERIT_ONLY;
1478 } else if (sid_equal(&current_ace->trustee, &global_sid_Creator_Group)) {
1479 current_ace->owner_type = GID_ACE;
1480 current_ace->unix_ug.gid = pst->st_gid;
1481 current_ace->type = SMB_ACL_GROUP_OBJ;
1482
1483 /*
1484 * The Creator Group entry only specifies inheritable permissions,
1485 * never access permissions. WinNT doesn't always set the ACE to
1486 *INHERIT_ONLY, though.
1487 */
1488 if (nt4_compatible_acls())
1489 psa->flags |= SEC_ACE_FLAG_INHERIT_ONLY;
1490
1491 } else if (sid_to_uid( &current_ace->trustee, &current_ace->unix_ug.uid)) {
1492 current_ace->owner_type = UID_ACE;
1493 /* If it's the owning user, this is a user_obj, not
1494 * a user. */
1495 if (current_ace->unix_ug.uid == pst->st_uid) {
1496 current_ace->type = SMB_ACL_USER_OBJ;
1497 } else {
1498 current_ace->type = SMB_ACL_USER;
1499 }
1500 } else if (sid_to_gid( &current_ace->trustee, &current_ace->unix_ug.gid)) {
1501 current_ace->owner_type = GID_ACE;
1502 /* If it's the primary group, this is a group_obj, not
1503 * a group. */
1504 if (current_ace->unix_ug.gid == pst->st_gid) {
1505 current_ace->type = SMB_ACL_GROUP_OBJ;
1506 } else {
1507 current_ace->type = SMB_ACL_GROUP;
1508 }
1509 } else {
1510 /*
1511 * Silently ignore map failures in non-mappable SIDs (NT Authority, BUILTIN etc).
1512 */
1513
1514 if (non_mappable_sid(&psa->trustee)) {
1515 DEBUG(10, ("create_canon_ace_lists: ignoring "
1516 "non-mappable SID %s\n",
1517 sid_string_dbg(&psa->trustee)));
1518 SAFE_FREE(current_ace);
1519 continue;
1520 }
1521
1522 free_canon_ace_list(file_ace);
1523 free_canon_ace_list(dir_ace);
1524 DEBUG(0, ("create_canon_ace_lists: unable to map SID "
1525 "%s to uid or gid.\n",
1526 sid_string_dbg(&current_ace->trustee)));
1527 SAFE_FREE(current_ace);
1528 return False;
1529 }
1530
1531 /*
1532 * Map the given NT permissions into a UNIX mode_t containing only
1533 * S_I(R|W|X)USR bits.
1534 */
1535
1536 current_ace->perms |= map_nt_perms( &psa->access_mask, S_IRUSR);
1537 current_ace->attr = (psa->type == SEC_ACE_TYPE_ACCESS_ALLOWED) ? ALLOW_ACE : DENY_ACE;
1538 current_ace->inherited = ((psa->flags & SEC_ACE_FLAG_INHERITED_ACE) ? True : False);
1539
1540 /*
1541 * Now add the created ace to either the file list, the directory
1542 * list, or both. We *MUST* preserve the order here (hence we use
1543 * DLIST_ADD_END) as NT ACLs are order dependent.
1544 */
1545
1546 if (fsp->is_directory) {
1547
1548 /*
1549 * We can only add to the default POSIX ACE list if the ACE is
1550 * designed to be inherited by both files and directories.
1551 */
1552
1553 if ((psa->flags & (SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT)) ==
1554 (SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT)) {
1555
1556 DLIST_ADD_END(dir_ace, current_ace, canon_ace *);
1557
1558 /*
1559 * Note if this was an allow ace. We can't process
1560 * any further deny ace's after this.
1561 */
1562
1563 if (current_ace->attr == ALLOW_ACE)
1564 got_dir_allow = True;
1565
1566 if ((current_ace->attr == DENY_ACE) && got_dir_allow) {
1567 DEBUG(0,("create_canon_ace_lists: malformed ACL in inheritable ACL ! \
1568 Deny entry after Allow entry. Failing to set on file %s.\n", fsp->fsp_name ));
1569 free_canon_ace_list(file_ace);
1570 free_canon_ace_list(dir_ace);
1571 return False;
1572 }
1573
1574 if( DEBUGLVL( 10 )) {
1575 dbgtext("create_canon_ace_lists: adding dir ACL:\n");
1576 print_canon_ace( current_ace, 0);
1577 }
1578
1579 /*
1580 * If this is not an inherit only ACE we need to add a duplicate
1581 * to the file acl.
1582 */
1583
1584 if (!(psa->flags & SEC_ACE_FLAG_INHERIT_ONLY)) {
1585 canon_ace *dup_ace = dup_canon_ace(current_ace);
1586
1587 if (!dup_ace) {
1588 DEBUG(0,("create_canon_ace_lists: malloc fail !\n"));
1589 free_canon_ace_list(file_ace);
1590 free_canon_ace_list(dir_ace);
1591 return False;
1592 }
1593
1594 /*
1595 * We must not free current_ace here as its
1596 * pointer is now owned by the dir_ace list.
1597 */
1598 current_ace = dup_ace;
1599 } else {
1600 /*
1601 * We must not free current_ace here as its
1602 * pointer is now owned by the dir_ace list.
1603 */
1604 current_ace = NULL;
1605 }
1606 }
1607 }
1608
1609 /*
1610 * Only add to the file ACL if not inherit only.
1611 */
1612
1613 if (current_ace && !(psa->flags & SEC_ACE_FLAG_INHERIT_ONLY)) {
1614 DLIST_ADD_END(file_ace, current_ace, canon_ace *);
1615
1616 /*
1617 * Note if this was an allow ace. We can't process
1618 * any further deny ace's after this.
1619 */
1620
1621 if (current_ace->attr == ALLOW_ACE)
1622 got_file_allow = True;
1623
1624 if ((current_ace->attr == DENY_ACE) && got_file_allow) {
1625 DEBUG(0,("create_canon_ace_lists: malformed ACL in file ACL ! \
1626 Deny entry after Allow entry. Failing to set on file %s.\n", fsp->fsp_name ));
1627 free_canon_ace_list(file_ace);
1628 free_canon_ace_list(dir_ace);
1629 return False;
1630 }
1631
1632 if( DEBUGLVL( 10 )) {
1633 dbgtext("create_canon_ace_lists: adding file ACL:\n");
1634 print_canon_ace( current_ace, 0);
1635 }
1636 all_aces_are_inherit_only = False;
1637 /*
1638 * We must not free current_ace here as its
1639 * pointer is now owned by the file_ace list.
1640 */
1641 current_ace = NULL;
1642 }
1643
1644 /*
1645 * Free if ACE was not added.
1646 */
1647
1648 SAFE_FREE(current_ace);
1649 }
1650
1651 if (fsp->is_directory && all_aces_are_inherit_only) {
1652 /*
1653 * Windows 2000 is doing one of these weird 'inherit acl'
1654 * traverses to conserve NTFS ACL resources. Just pretend
1655 * there was no DACL sent. JRA.
1656 */
1657
1658 DEBUG(10,("create_canon_ace_lists: Win2k inherit acl traverse. Ignoring DACL.\n"));
1659 free_canon_ace_list(file_ace);
1660 free_canon_ace_list(dir_ace);
1661 file_ace = NULL;
1662 dir_ace = NULL;
1663 } else {
1664 /*
1665 * Check if we have SMB_ACL_USER_OBJ and SMB_ACL_GROUP_OBJ entries in each
1666 * ACL. If we don't have them, check if any SMB_ACL_USER/SMB_ACL_GROUP
1667 * entries can be converted to *_OBJ. Usually we will already have these
1668 * entries in the Default ACL, and the Access ACL will not have them.
1669 */
1670 if (file_ace) {
1671 check_owning_objs(file_ace, pfile_owner_sid, pfile_grp_sid);
1672 }
1673 if (dir_ace) {
1674 check_owning_objs(dir_ace, pfile_owner_sid, pfile_grp_sid);
1675 }
1676 }
1677
1678 *ppfile_ace = file_ace;
1679 *ppdir_ace = dir_ace;
1680
1681 return True;
1682 }
1683
1684 /****************************************************************************
1685 ASCII art time again... JRA :-).
1686
1687 We have 4 cases to process when moving from an NT ACL to a POSIX ACL. Firstly,
1688 we insist the ACL is in canonical form (ie. all DENY entries preceede ALLOW
1689 entries). Secondly, the merge code has ensured that all duplicate SID entries for
1690 allow or deny have been merged, so the same SID can only appear once in the deny
1691 list or once in the allow list.
1692
1693 We then process as follows :
1694
1695 ---------------------------------------------------------------------------
1696 First pass - look for a Everyone DENY entry.
1697
1698 If it is deny all (rwx) trunate the list at this point.
1699 Else, walk the list from this point and use the deny permissions of this
1700 entry as a mask on all following allow entries. Finally, delete
1701 the Everyone DENY entry (we have applied it to everything possible).
1702
1703 In addition, in this pass we remove any DENY entries that have
1704 no permissions (ie. they are a DENY nothing).
1705 ---------------------------------------------------------------------------
1706 Second pass - only deal with deny user entries.
1707
1708 DENY user1 (perms XXX)
1709
1710 new_perms = 0
1711 for all following allow group entries where user1 is in group
1712 new_perms |= group_perms;
1713
1714 user1 entry perms = new_perms & ~ XXX;
1715
1716 Convert the deny entry to an allow entry with the new perms and
1717 push to the end of the list. Note if the user was in no groups
1718 this maps to a specific allow nothing entry for this user.
1719
1720 The common case from the NT ACL choser (userX deny all) is
1721 optimised so we don't do the group lookup - we just map to
1722 an allow nothing entry.
1723
1724 What we're doing here is inferring the allow permissions the
1725 person setting the ACE on user1 wanted by looking at the allow
1726 permissions on the groups the user is currently in. This will
1727 be a snapshot, depending on group membership but is the best
1728 we can do and has the advantage of failing closed rather than
1729 open.
1730 ---------------------------------------------------------------------------
1731 Third pass - only deal with deny group entries.
1732
1733 DENY group1 (perms XXX)
1734
1735 for all following allow user entries where user is in group1
1736 user entry perms = user entry perms & ~ XXX;
1737
1738 If there is a group Everyone allow entry with permissions YYY,
1739 convert the group1 entry to an allow entry and modify its
1740 permissions to be :
1741
1742 new_perms = YYY & ~ XXX
1743
1744 and push to the end of the list.
1745
1746 If there is no group Everyone allow entry then convert the
1747 group1 entry to a allow nothing entry and push to the end of the list.
1748
1749 Note that the common case from the NT ACL choser (groupX deny all)
1750 cannot be optimised here as we need to modify user entries who are
1751 in the group to change them to a deny all also.
1752
1753 What we're doing here is modifying the allow permissions of
1754 user entries (which are more specific in POSIX ACLs) to mask
1755 out the explicit deny set on the group they are in. This will
1756 be a snapshot depending on current group membership but is the
1757 best we can do and has the advantage of failing closed rather
1758 than open.
1759 ---------------------------------------------------------------------------
1760 Fourth pass - cope with cumulative permissions.
1761
1762 for all allow user entries, if there exists an allow group entry with
1763 more permissive permissions, and the user is in that group, rewrite the
1764 allow user permissions to contain both sets of permissions.
1765
1766 Currently the code for this is #ifdef'ed out as these semantics make
1767 no sense to me. JRA.
1768 ---------------------------------------------------------------------------
1769
1770 Note we *MUST* do the deny user pass first as this will convert deny user
1771 entries into allow user entries which can then be processed by the deny
1772 group pass.
1773
1774 The above algorithm took a *lot* of thinking about - hence this
1775 explaination :-). JRA.
1776 ****************************************************************************/
1777
1778 /****************************************************************************
1779 Process a canon_ace list entries. This is very complex code. We need
1780 to go through and remove the "deny" permissions from any allow entry that matches
1781 the id of this entry. We have already refused any NT ACL that wasn't in correct
1782 order (DENY followed by ALLOW). If any allow entry ends up with zero permissions,
1783 we just remove it (to fail safe). We have already removed any duplicate ace
1784 entries. Treat an "Everyone" DENY_ACE as a special case - use it to mask all
1785 allow entries.
1786 ****************************************************************************/
1787
1788 static void process_deny_list( canon_ace **pp_ace_list )
1789 {
1790 canon_ace *ace_list = *pp_ace_list;
1791 canon_ace *curr_ace = NULL;
1792 canon_ace *curr_ace_next = NULL;
1793
1794 /* Pass 1 above - look for an Everyone, deny entry. */
1795
1796 for (curr_ace = ace_list; curr_ace; curr_ace = curr_ace_next) {
1797 canon_ace *allow_ace_p;
1798
1799 curr_ace_next = curr_ace->next; /* So we can't lose the link. */
1800
1801 if (curr_ace->attr != DENY_ACE)
1802 continue;
1803
1804 if (curr_ace->perms == (mode_t)0) {
1805
1806 /* Deny nothing entry - delete. */
1807
1808 DLIST_REMOVE(ace_list, curr_ace);
1809 continue;
1810 }
1811
1812 if (!sid_equal(&curr_ace->trustee, &global_sid_World))
1813 continue;
1814
1815 /* JRATEST - assert. */
1816 SMB_ASSERT(curr_ace->owner_type == WORLD_ACE);
1817
1818 if (curr_ace->perms == ALL_ACE_PERMS) {
1819
1820 /*
1821 * Optimisation. This is a DENY_ALL to Everyone. Truncate the
1822 * list at this point including this entry.
1823 */
1824
1825 canon_ace *prev_entry = curr_ace->prev;
1826
1827 free_canon_ace_list( curr_ace );
1828 if (prev_entry)
1829 prev_entry->next = NULL;
1830 else {
1831 /* We deleted the entire list. */
1832 ace_list = NULL;
1833 }
1834 break;
1835 }
1836
1837 for (allow_ace_p = curr_ace->next; allow_ace_p; allow_ace_p = allow_ace_p->next) {
1838
1839 /*
1840 * Only mask off allow entries.
1841 */
1842
1843 if (allow_ace_p->attr != ALLOW_ACE)
1844 continue;
1845
1846 allow_ace_p->perms &= ~curr_ace->perms;
1847 }
1848
1849 /*
1850 * Now it's been applied, remove it.
1851 */
1852
1853 DLIST_REMOVE(ace_list, curr_ace);
1854 }
1855
1856 /* Pass 2 above - deal with deny user entries. */
1857
1858 for (curr_ace = ace_list; curr_ace; curr_ace = curr_ace_next) {
1859 mode_t new_perms = (mode_t)0;
1860 canon_ace *allow_ace_p;
1861
1862 curr_ace_next = curr_ace->next; /* So we can't lose the link. */
1863
1864 if (curr_ace->attr != DENY_ACE)
1865 continue;
1866
1867 if (curr_ace->owner_type != UID_ACE)
1868 continue;
1869
1870 if (curr_ace->perms == ALL_ACE_PERMS) {
1871
1872 /*
1873 * Optimisation - this is a deny everything to this user.
1874 * Convert to an allow nothing and push to the end of the list.
1875 */
1876
1877 curr_ace->attr = ALLOW_ACE;
1878 curr_ace->perms = (mode_t)0;
1879 DLIST_DEMOTE(ace_list, curr_ace, canon_ace *);
1880 continue;
1881 }
1882
1883 for (allow_ace_p = curr_ace->next; allow_ace_p; allow_ace_p = allow_ace_p->next) {
1884
1885 if (allow_ace_p->attr != ALLOW_ACE)
1886 continue;
1887
1888 /* We process GID_ACE and WORLD_ACE entries only. */
1889
1890 if (allow_ace_p->owner_type == UID_ACE)
1891 continue;
1892
1893 if (uid_entry_in_group( curr_ace, allow_ace_p))
1894 new_perms |= allow_ace_p->perms;
1895 }
1896
1897 /*
1898 * Convert to a allow entry, modify the perms and push to the end
1899 * of the list.
1900 */
1901
1902 curr_ace->attr = ALLOW_ACE;
1903 curr_ace->perms = (new_perms & ~curr_ace->perms);
1904 DLIST_DEMOTE(ace_list, curr_ace, canon_ace *);
1905 }
1906
1907 /* Pass 3 above - deal with deny group entries. */
1908
1909 for (curr_ace = ace_list; curr_ace; curr_ace = curr_ace_next) {
1910 canon_ace *allow_ace_p;
1911 canon_ace *allow_everyone_p = NULL;
1912
1913 curr_ace_next = curr_ace->next; /* So we can't lose the link. */
1914
1915 if (curr_ace->attr != DENY_ACE)
1916 continue;
1917
1918 if (curr_ace->owner_type != GID_ACE)
1919 continue;
1920
1921 for (allow_ace_p = curr_ace->next; allow_ace_p; allow_ace_p = allow_ace_p->next) {
1922
1923 if (allow_ace_p->attr != ALLOW_ACE)
1924 continue;
1925
1926 /* Store a pointer to the Everyone allow, if it exists. */
1927 if (allow_ace_p->owner_type == WORLD_ACE)
1928 allow_everyone_p = allow_ace_p;
1929
1930 /* We process UID_ACE entries only. */
1931
1932 if (allow_ace_p->owner_type != UID_ACE)
1933 continue;
1934
1935 /* Mask off the deny group perms. */
1936
1937 if (uid_entry_in_group( allow_ace_p, curr_ace))
1938 allow_ace_p->perms &= ~curr_ace->perms;
1939 }
1940
1941 /*
1942 * Convert the deny to an allow with the correct perms and
1943 * push to the end of the list.
1944 */
1945
1946 curr_ace->attr = ALLOW_ACE;
1947 if (allow_everyone_p)
1948 curr_ace->perms = allow_everyone_p->perms & ~curr_ace->perms;
1949 else
1950 curr_ace->perms = (mode_t)0;
1951 DLIST_DEMOTE(ace_list, curr_ace, canon_ace *);
1952 }
1953
1954 /* Doing this fourth pass allows Windows semantics to be layered
1955 * on top of POSIX semantics. I'm not sure if this is desirable.
1956 * For example, in W2K ACLs there is no way to say, "Group X no
1957 * access, user Y full access" if user Y is a member of group X.
1958 * This seems completely broken semantics to me.... JRA.
1959 */
1960
1961 #if 0
1962 /* Pass 4 above - deal with allow entries. */
1963
1964 for (curr_ace = ace_list; curr_ace; curr_ace = curr_ace_next) {
1965 canon_ace *allow_ace_p;
1966
1967 curr_ace_next = curr_ace->next; /* So we can't lose the link. */
1968
1969 if (curr_ace->attr != ALLOW_ACE)
1970 continue;
1971
1972 if (curr_ace->owner_type != UID_ACE)
1973 continue;
1974
1975 for (allow_ace_p = ace_list; allow_ace_p; allow_ace_p = allow_ace_p->next) {
1976
1977 if (allow_ace_p->attr != ALLOW_ACE)
1978 continue;
1979
1980 /* We process GID_ACE entries only. */
1981
1982 if (allow_ace_p->owner_type != GID_ACE)
1983 continue;
1984
1985 /* OR in the group perms. */
1986
1987 if (uid_entry_in_group( curr_ace, allow_ace_p))
1988 curr_ace->perms |= allow_ace_p->perms;
1989 }
1990 }
1991 #endif
1992
1993 *pp_ace_list = ace_list;
1994 }
1995
1996 /****************************************************************************
1997 Create a default mode that will be used if a security descriptor entry has
1998 no user/group/world entries.
1999 ****************************************************************************/
2000
2001 static mode_t create_default_mode(files_struct *fsp, bool interitable_mode)
2002 {
2003 int snum = SNUM(fsp->conn);
2004 mode_t and_bits = (mode_t)0;
2005 mode_t or_bits = (mode_t)0;
2006 mode_t mode = interitable_mode
2007 ? unix_mode( fsp->conn, FILE_ATTRIBUTE_ARCHIVE, fsp->fsp_name,
2008 NULL )
2009 : S_IRUSR;
2010
2011 if (fsp->is_directory)
2012 mode |= (S_IWUSR|S_IXUSR);
2013
2014 /*
2015 * Now AND with the create mode/directory mode bits then OR with the
2016 * force create mode/force directory mode bits.
2017 */
2018
2019 if (fsp->is_directory) {
2020 and_bits = lp_dir_security_mask(snum);
2021 or_bits = lp_force_dir_security_mode(snum);
2022 } else {
2023 and_bits = lp_security_mask(snum);
2024 or_bits = lp_force_security_mode(snum);
2025 }
2026
2027 return ((mode & and_bits)|or_bits);
2028 }
2029
2030 /****************************************************************************
2031 Unpack a SEC_DESC into two canonical ace lists. We don't depend on this
2032 succeeding.
2033 ****************************************************************************/
2034
2035 static bool unpack_canon_ace(files_struct *fsp,
2036 SMB_STRUCT_STAT *pst,
2037 DOM_SID *pfile_owner_sid,
2038 DOM_SID *pfile_grp_sid,
2039 canon_ace **ppfile_ace,
2040 canon_ace **ppdir_ace,
2041 uint32 security_info_sent,
2042 const SEC_DESC *psd)
2043 {
2044 canon_ace *file_ace = NULL;
2045 canon_ace *dir_ace = NULL;
2046
2047 *ppfile_ace = NULL;
2048 *ppdir_ace = NULL;
2049
2050 if(security_info_sent == 0) {
2051 DEBUG(0,("unpack_canon_ace: no security info sent !\n"));
2052 return False;
2053 }
2054
2055 /*
2056 * If no DACL then this is a chown only security descriptor.
2057 */
2058
2059 if(!(security_info_sent & DACL_SECURITY_INFORMATION) || !psd->dacl)
2060 return True;
2061
2062 /*
2063 * Now go through the DACL and create the canon_ace lists.
2064 */
2065
2066 if (!create_canon_ace_lists( fsp, pst, pfile_owner_sid, pfile_grp_sid,
2067 &file_ace, &dir_ace, psd->dacl))
2068 return False;
2069
2070 if ((file_ace == NULL) && (dir_ace == NULL)) {
2071 /* W2K traverse DACL set - ignore. */
2072 return True;
2073 }
2074
2075 /*
2076 * Go through the canon_ace list and merge entries
2077 * belonging to identical users of identical allow or deny type.
2078 * We can do this as all deny entries come first, followed by
2079 * all allow entries (we have mandated this before accepting this acl).
2080 */
2081
2082 print_canon_ace_list( "file ace - before merge", file_ace);
2083 merge_aces( &file_ace );
2084
2085 print_canon_ace_list( "dir ace - before merge", dir_ace);
2086 merge_aces( &dir_ace );
2087
2088 /*
2089 * NT ACLs are order dependent. Go through the acl lists and
2090 * process DENY entries by masking the allow entries.
2091 */
2092
2093 print_canon_ace_list( "file ace - before deny", file_ace);
2094 process_deny_list( &file_ace);
2095
2096 print_canon_ace_list( "dir ace - before deny", dir_ace);
2097 process_deny_list( &dir_ace);
2098
2099 /*
2100 * A well formed POSIX file or default ACL has at least 3 entries, a
2101 * SMB_ACL_USER_OBJ, SMB_ACL_GROUP_OBJ, SMB_ACL_OTHER_OBJ
2102 * and optionally a mask entry. Ensure this is the case.
2103 */
2104
2105 print_canon_ace_list( "file ace - before valid", file_ace);
2106
2107 /*
2108 * A default 3 element mode entry for a file should be r-- --- ---.
2109 * A default 3 element mode entry for a directory should be rwx --- ---.
2110 */
2111
2112 pst->st_mode = create_default_mode(fsp, False);
2113
2114 if (!ensure_canon_entry_valid(&file_ace, fsp->conn->params, fsp->is_directory, pfile_owner_sid, pfile_grp_sid, pst, True)) {
2115 free_canon_ace_list(file_ace);
2116 free_canon_ace_list(dir_ace);
2117 return False;
2118 }
2119
2120 print_canon_ace_list( "dir ace - before valid", dir_ace);
2121
2122 /*
2123 * A default inheritable 3 element mode entry for a directory should be the
2124 * mode Samba will use to create a file within. Ensure user rwx bits are set if
2125 * it's a directory.
2126 */
2127
2128 pst->st_mode = create_default_mode(fsp, True);
2129
2130 if (dir_ace && !ensure_canon_entry_valid(&dir_ace, fsp->conn->params, fsp->is_directory, pfile_owner_sid, pfile_grp_sid, pst, True)) {
2131 free_canon_ace_list(file_ace);
2132 free_canon_ace_list(dir_ace);
2133 return False;
2134 }
2135
2136 print_canon_ace_list( "file ace - return", file_ace);
2137 print_canon_ace_list( "dir ace - return", dir_ace);
2138
2139 *ppfile_ace = file_ace;
2140 *ppdir_ace = dir_ace;
2141 return True;
2142
2143 }
2144
2145 /******************************************************************************
2146 When returning permissions, try and fit NT display
2147 semantics if possible. Note the the canon_entries here must have been malloced.
2148 The list format should be - first entry = owner, followed by group and other user
2149 entries, last entry = other.
2150
2151 Note that this doesn't exactly match the NT semantics for an ACL. As POSIX entries
2152 are not ordered, and match on the most specific entry rather than walking a list,
2153 then a simple POSIX permission of rw-r--r-- should really map to 5 entries,
2154
2155 Entry 0: owner : deny all except read and write.
2156 Entry 1: owner : allow read and write.
2157 Entry 2: group : deny all except read.
2158 Entry 3: group : allow read.
2159 Entry 4: Everyone : allow read.
2160
2161 But NT cannot display this in their ACL editor !
2162 ********************************************************************************/
2163
2164 static void arrange_posix_perms(const char *filename, canon_ace **pp_list_head)
2165 {
2166 canon_ace *l_head = *pp_list_head;
2167 canon_ace *owner_ace = NULL;
2168 canon_ace *other_ace = NULL;
2169 canon_ace *ace = NULL;
2170
2171 for (ace = l_head; ace; ace = ace->next) {
2172 if (ace->type == SMB_ACL_USER_OBJ)
2173 owner_ace = ace;
2174 else if (ace->type == SMB_ACL_OTHER) {
2175 /* Last ace - this is "other" */
2176 other_ace = ace;
2177 }
2178 }
2179
2180 if (!owner_ace || !other_ace) {
2181 DEBUG(0,("arrange_posix_perms: Invalid POSIX permissions for file %s, missing owner or other.\n",
2182 filename ));
2183 return;
2184 }
2185
2186 /*
2187 * The POSIX algorithm applies to owner first, and other last,
2188 * so ensure they are arranged in this order.
2189 */
2190
2191 if (owner_ace) {
2192 DLIST_PROMOTE(l_head, owner_ace);
2193 }
2194
2195 if (other_ace) {
2196 DLIST_DEMOTE(l_head, other_ace, canon_ace *);
2197 }
2198
2199 /* We have probably changed the head of the list. */
2200
2201 *pp_list_head = l_head;
2202 }
2203
2204 /****************************************************************************
2205 Create a linked list of canonical ACE entries.
2206 ****************************************************************************/
2207
2208 static canon_ace *canonicalise_acl(struct connection_struct *conn,
2209 const char *fname, SMB_ACL_T posix_acl,
2210 const SMB_STRUCT_STAT *psbuf,
2211 const DOM_SID *powner, const DOM_SID *pgroup, struct pai_val *pal, SMB_ACL_TYPE_T the_acl_type)
2212 {
2213 mode_t acl_mask = (S_IRUSR|S_IWUSR|S_IXUSR);
2214 canon_ace *l_head = NULL;
2215 canon_ace *ace = NULL;
2216 canon_ace *next_ace = NULL;
2217 int entry_id = SMB_ACL_FIRST_ENTRY;
2218 SMB_ACL_ENTRY_T entry;
2219 size_t ace_count;
2220
2221 while ( posix_acl && (SMB_VFS_SYS_ACL_GET_ENTRY(conn, posix_acl, entry_id, &entry) == 1)) {
2222 SMB_ACL_TAG_T tagtype;
2223 SMB_ACL_PERMSET_T permset;
2224 DOM_SID sid;
2225 posix_id unix_ug;
2226 enum ace_owner owner_type;
2227
2228 entry_id = SMB_ACL_NEXT_ENTRY;
2229
2230 /* Is this a MASK entry ? */
2231 if (SMB_VFS_SYS_ACL_GET_TAG_TYPE(conn, entry, &tagtype) == -1)
2232 continue;
2233
2234 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, entry, &permset) == -1)
2235 continue;
2236
2237 /* Decide which SID to use based on the ACL type. */
2238 switch(tagtype) {
2239 case SMB_ACL_USER_OBJ:
2240 /* Get the SID from the owner. */
2241 sid_copy(&sid, powner);
2242 unix_ug.uid = psbuf->st_uid;
2243 owner_type = UID_ACE;
2244 break;
2245 case SMB_ACL_USER:
2246 {
2247 uid_t *puid = (uid_t *)SMB_VFS_SYS_ACL_GET_QUALIFIER(conn, entry);
2248 if (puid == NULL) {
2249 DEBUG(0,("canonicalise_acl: Failed to get uid.\n"));
2250 continue;
2251 }
2252 /*
2253 * A SMB_ACL_USER entry for the owner is shadowed by the
2254 * SMB_ACL_USER_OBJ entry and Windows also cannot represent
2255 * that entry, so we ignore it. We also don't create such
2256 * entries out of the blue when setting ACLs, so a get/set
2257 * cycle will drop them.
2258 */
2259 if (the_acl_type == SMB_ACL_TYPE_ACCESS && *puid == psbuf->st_uid) {
2260 SMB_VFS_SYS_ACL_FREE_QUALIFIER(conn, (void *)puid,tagtype);
2261 continue;
2262 }
2263 uid_to_sid( &sid, *puid);
2264 unix_ug.uid = *puid;
2265 owner_type = UID_ACE;
2266 SMB_VFS_SYS_ACL_FREE_QUALIFIER(conn, (void *)puid,tagtype);
2267 break;
2268 }
2269 case SMB_ACL_GROUP_OBJ:
2270 /* Get the SID from the owning group. */
2271 sid_copy(&sid, pgroup);
2272 unix_ug.gid = psbuf->st_gid;
2273 owner_type = GID_ACE;
2274 break;
2275 case SMB_ACL_GROUP:
2276 {
2277 gid_t *pgid = (gid_t *)SMB_VFS_SYS_ACL_GET_QUALIFIER(conn, entry);
2278 if (pgid == NULL) {
2279 DEBUG(0,("canonicalise_acl: Failed to get gid.\n"));
2280 continue;
2281 }
2282 gid_to_sid( &sid, *pgid);
2283 unix_ug.gid = *pgid;
2284 owner_type = GID_ACE;
2285 SMB_VFS_SYS_ACL_FREE_QUALIFIER(conn, (void *)pgid,tagtype);
2286 break;
2287 }
2288 case SMB_ACL_MASK:
2289 acl_mask = convert_permset_to_mode_t(conn, permset);
2290 continue; /* Don't count the mask as an entry. */
2291 case SMB_ACL_OTHER:
2292 /* Use the Everyone SID */
2293 sid = global_sid_World;
2294 unix_ug.world = -1;
2295 owner_type = WORLD_ACE;
2296 break;
2297 default:
2298 DEBUG(0,("canonicalise_acl: Unknown tagtype %u\n", (unsigned int)tagtype));
2299 continue;
2300 }
2301
2302 /*
2303 * Add this entry to the list.
2304 */
2305
2306 if ((ace = SMB_MALLOC_P(canon_ace)) == NULL)
2307 goto fail;
2308
2309 ZERO_STRUCTP(ace);
2310 ace->type = tagtype;
2311 ace->perms = convert_permset_to_mode_t(conn, permset);
2312 ace->attr = ALLOW_ACE;
2313 ace->trustee = sid;
2314 ace->unix_ug = unix_ug;
2315 ace->owner_type = owner_type;
2316 ace->inherited = get_inherited_flag(pal, ace, (the_acl_type == SMB_ACL_TYPE_DEFAULT));
2317
2318 DLIST_ADD(l_head, ace);
2319 }
2320
2321 /*
2322 * This next call will ensure we have at least a user/group/world set.
2323 */
2324
2325 if (!ensure_canon_entry_valid(&l_head, conn->params,
2326 S_ISDIR(psbuf->st_mode), powner, pgroup,
2327 psbuf, False))
2328 goto fail;
2329
2330 /*
2331 * Now go through the list, masking the permissions with the
2332 * acl_mask. Ensure all DENY Entries are at the start of the list.
2333 */
2334
2335 DEBUG(10,("canonicalise_acl: %s ace entries before arrange :\n", the_acl_type == SMB_ACL_TYPE_ACCESS ? "Access" : "Default" ));
2336
2337 for ( ace_count = 0, ace = l_head; ace; ace = next_ace, ace_count++) {
2338 next_ace = ace->next;
2339
2340 /* Masks are only applied to entries other than USER_OBJ and OTHER. */
2341 if (ace->type != SMB_ACL_OTHER && ace->type != SMB_ACL_USER_OBJ)
2342 ace->perms &= acl_mask;
2343
2344 if (ace->perms == 0) {
2345 DLIST_PROMOTE(l_head, ace);
2346 }
2347
2348 if( DEBUGLVL( 10 ) ) {
2349 print_canon_ace(ace, ace_count);
2350 }
2351 }
2352
2353 arrange_posix_perms(fname,&l_head );
2354
2355 print_canon_ace_list( "canonicalise_acl: ace entries after arrange", l_head );
2356
2357 return l_head;
2358
2359 fail:
2360
2361 free_canon_ace_list(l_head);
2362 return NULL;
2363 }
2364
2365 /****************************************************************************
2366 Check if the current user group list contains a given group.
2367 ****************************************************************************/
2368
2369 static bool current_user_in_group(gid_t gid)
2370 {
2371 int i;
2372
2373 for (i = 0; i < current_user.ut.ngroups; i++) {
2374 if (current_user.ut.groups[i] == gid) {
2375 return True;
2376 }
2377 }
2378
2379 return False;
2380 }
2381
2382 /****************************************************************************
2383 Should we override a deny ? Check 'acl group control' and 'dos filemode'.
2384 ****************************************************************************/
2385
2386 static bool acl_group_override(connection_struct *conn,
2387 gid_t prim_gid,
2388 const char *fname)
2389 {
2390 SMB_STRUCT_STAT sbuf;
2391
2392 if ((errno != EPERM) && (errno != EACCES)) {
2393 return false;
2394 }
2395
2396 /* file primary group == user primary or supplementary group */
2397 if (lp_acl_group_control(SNUM(conn)) &&
2398 current_user_in_group(prim_gid)) {
2399 return true;
2400 }
2401
2402 /* user has writeable permission */
2403 if (lp_dos_filemode(SNUM(conn)) &&
2404 can_write_to_file(conn, fname, &sbuf)) {
2405 return true;
2406 }
2407
2408 return false;
2409 }
2410
2411 /****************************************************************************
2412 Attempt to apply an ACL to a file or directory.
2413 ****************************************************************************/
2414
2415 static bool set_canon_ace_list(files_struct *fsp, canon_ace *the_ace, bool default_ace, gid_t prim_gid, bool *pacl_set_support)
2416 {
2417 connection_struct *conn = fsp->conn;
2418 bool ret = False;
2419 SMB_ACL_T the_acl = SMB_VFS_SYS_ACL_INIT(conn, (int)count_canon_ace_list(the_ace) + 1);
2420 canon_ace *p_ace;
2421 int i;
2422 SMB_ACL_ENTRY_T mask_entry;
2423 bool got_mask_entry = False;
2424 SMB_ACL_PERMSET_T mask_permset;
2425 SMB_ACL_TYPE_T the_acl_type = (default_ace ? SMB_ACL_TYPE_DEFAULT : SMB_ACL_TYPE_ACCESS);
2426 bool needs_mask = False;
2427 mode_t mask_perms = 0;
2428
2429 #if defined(POSIX_ACL_NEEDS_MASK)
2430 /* HP-UX always wants to have a mask (called "class" there). */
2431 needs_mask = True;
2432 #endif
2433
2434 if (the_acl == NULL) {
2435
2436 if (!no_acl_syscall_error(errno)) {
2437 /*
2438 * Only print this error message if we have some kind of ACL
2439 * support that's not working. Otherwise we would always get this.
2440 */
2441 DEBUG(0,("set_canon_ace_list: Unable to init %s ACL. (%s)\n",
2442 default_ace ? "default" : "file", strerror(errno) ));
2443 }
2444 *pacl_set_support = False;
2445 return False;
2446 }
2447
2448 if( DEBUGLVL( 10 )) {
2449 dbgtext("set_canon_ace_list: setting ACL:\n");
2450 for (i = 0, p_ace = the_ace; p_ace; p_ace = p_ace->next, i++ ) {
2451 print_canon_ace( p_ace, i);
2452 }
2453 }
2454
2455 for (i = 0, p_ace = the_ace; p_ace; p_ace = p_ace->next, i++ ) {
2456 SMB_ACL_ENTRY_T the_entry;
2457 SMB_ACL_PERMSET_T the_permset;
2458
2459 /*
2460 * ACLs only "need" an ACL_MASK entry if there are any named user or
2461 * named group entries. But if there is an ACL_MASK entry, it applies
2462 * to ACL_USER, ACL_GROUP, and ACL_GROUP_OBJ entries. Set the mask
2463 * so that it doesn't deny (i.e., mask off) any permissions.
2464 */
2465
2466 if (p_ace->type == SMB_ACL_USER || p_ace->type == SMB_ACL_GROUP) {
2467 needs_mask = True;
2468 mask_perms |= p_ace->perms;
2469 } else if (p_ace->type == SMB_ACL_GROUP_OBJ) {
2470 mask_perms |= p_ace->perms;
2471 }
2472
2473 /*
2474 * Get the entry for this ACE.
2475 */
2476
2477 if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &the_acl, &the_entry) == -1) {
2478 DEBUG(0,("set_canon_ace_list: Failed to create entry %d. (%s)\n",
2479 i, strerror(errno) ));
2480 goto fail;
2481 }
2482
2483 if (p_ace->type == SMB_ACL_MASK) {
2484 mask_entry = the_entry;
2485 got_mask_entry = True;
2486 }
2487
2488 /*
2489 * Ok - we now know the ACL calls should be working, don't
2490 * allow fallback to chmod.
2491 */
2492
2493 *pacl_set_support = True;
2494
2495 /*
2496 * Initialise the entry from the canon_ace.
2497 */
2498
2499 /*
2500 * First tell the entry what type of ACE this is.
2501 */
2502
2503 if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, the_entry, p_ace->type) == -1) {
2504 DEBUG(0,("set_canon_ace_list: Failed to set tag type on entry %d. (%s)\n",
2505 i, strerror(errno) ));
2506 goto fail;
2507 }
2508
2509 /*
2510 * Only set the qualifier (user or group id) if the entry is a user
2511 * or group id ACE.
2512 */
2513
2514 if ((p_ace->type == SMB_ACL_USER) || (p_ace->type == SMB_ACL_GROUP)) {
2515 if (SMB_VFS_SYS_ACL_SET_QUALIFIER(conn, the_entry,(void *)&p_ace->unix_ug.uid) == -1) {
2516 DEBUG(0,("set_canon_ace_list: Failed to set qualifier on entry %d. (%s)\n",
2517 i, strerror(errno) ));
2518 goto fail;
2519 }
2520 }
2521
2522 /*
2523 * Convert the mode_t perms in the canon_ace to a POSIX permset.
2524 */
2525
2526 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, the_entry, &the_permset) == -1) {
2527 DEBUG(0,("set_canon_ace_list: Failed to get permset on entry %d. (%s)\n",
2528 i, strerror(errno) ));
2529 goto fail;
2530 }
2531
2532 if (map_acl_perms_to_permset(conn, p_ace->perms, &the_permset) == -1) {
2533 DEBUG(0,("set_canon_ace_list: Failed to create permset for mode (%u) on entry %d. (%s)\n",
2534 (unsigned int)p_ace->perms, i, strerror(errno) ));
2535 goto fail;
2536 }
2537
2538 /*
2539 * ..and apply them to the entry.
2540 */
2541
2542 if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, the_entry, the_permset) == -1) {
2543 DEBUG(0,("set_canon_ace_list: Failed to add permset on entry %d. (%s)\n",
2544 i, strerror(errno) ));
2545 goto fail;
2546 }
2547
2548 if( DEBUGLVL( 10 ))
2549 print_canon_ace( p_ace, i);
2550
2551 }
2552
2553 if (needs_mask && !got_mask_entry) {
2554 if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &the_acl, &mask_entry) == -1) {
2555 DEBUG(0,("set_canon_ace_list: Failed to create mask entry. (%s)\n", strerror(errno) ));
2556 goto fail;
2557 }
2558
2559 if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, mask_entry, SMB_ACL_MASK) == -1) {
2560 DEBUG(0,("set_canon_ace_list: Failed to set tag type on mask entry. (%s)\n",strerror(errno) ));
2561 goto fail;
2562 }
2563
2564 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, mask_entry, &mask_permset) == -1) {
2565 DEBUG(0,("set_canon_ace_list: Failed to get mask permset. (%s)\n", strerror(errno) ));
2566 goto fail;
2567 }
2568
2569 if (map_acl_perms_to_permset(conn, S_IRUSR|S_IWUSR|S_IXUSR, &mask_permset) == -1) {
2570 DEBUG(0,("set_canon_ace_list: Failed to create mask permset. (%s)\n", strerror(errno) ));
2571 goto fail;
2572 }
2573
2574 if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, mask_entry, mask_permset) == -1) {
2575 DEBUG(0,("set_canon_ace_list: Failed to add mask permset. (%s)\n", strerror(errno) ));
2576 goto fail;
2577 }
2578 }
2579
2580 /*
2581 * Finally apply it to the file or directory.
2582 */
2583
2584 if(default_ace || fsp->is_directory || fsp->fh->fd == -1) {
2585 if (SMB_VFS_SYS_ACL_SET_FILE(conn, fsp->fsp_name, the_acl_type, the_acl) == -1) {
2586 /*
2587 * Some systems allow all the above calls and only fail with no ACL support
2588 * when attempting to apply the acl. HPUX with HFS is an example of this. JRA.
2589 */
2590 if (no_acl_syscall_error(errno)) {
2591 *pacl_set_support = False;
2592 }
2593
2594 if (acl_group_override(conn, prim_gid, fsp->fsp_name)) {
2595 int sret;
2596
2597 DEBUG(5,("set_canon_ace_list: acl group control on and current user in file %s primary group.\n",
2598 fsp->fsp_name ));
2599
2600 become_root();
2601 sret = SMB_VFS_SYS_ACL_SET_FILE(conn, fsp->fsp_name, the_acl_type, the_acl);
2602 unbecome_root();
2603 if (sret == 0) {
2604 ret = True;
2605 }
2606 }
2607
2608 if (ret == False) {
2609 DEBUG(2,("set_canon_ace_list: sys_acl_set_file type %s failed for file %s (%s).\n",
2610 the_acl_type == SMB_ACL_TYPE_DEFAULT ? "directory default" : "file",
2611 fsp->fsp_name, strerror(errno) ));
2612 goto fail;
2613 }
2614 }
2615 } else {
2616 if (SMB_VFS_SYS_ACL_SET_FD(fsp, the_acl) == -1) {
2617 /*
2618 * Some systems allow all the above calls and only fail with no ACL support
2619 * when attempting to apply the acl. HPUX with HFS is an example of this. JRA.
2620 */
2621 if (no_acl_syscall_error(errno)) {
2622 *pacl_set_support = False;
2623 }
2624
2625 if (acl_group_override(conn, prim_gid, fsp->fsp_name)) {
2626 int sret;
2627
2628 DEBUG(5,("set_canon_ace_list: acl group control on and current user in file %s primary group.\n",
2629 fsp->fsp_name ));
2630
2631 become_root();
2632 sret = SMB_VFS_SYS_ACL_SET_FD(fsp, the_acl);
2633 unbecome_root();
2634 if (sret == 0) {
2635 ret = True;
2636 }
2637 }
2638
2639 if (ret == False) {
2640 DEBUG(2,("set_canon_ace_list: sys_acl_set_file failed for file %s (%s).\n",
2641 fsp->fsp_name, strerror(errno) ));
2642 goto fail;
2643 }
2644 }
2645 }
2646
2647 ret = True;
2648
2649 fail:
2650
2651 if (the_acl != NULL) {
2652 SMB_VFS_SYS_ACL_FREE_ACL(conn, the_acl);
2653 }
2654
2655 return ret;
2656 }
2657
2658 /****************************************************************************
2659 Find a particular canon_ace entry.
2660 ****************************************************************************/
2661
2662 static struct canon_ace *canon_ace_entry_for(struct canon_ace *list, SMB_ACL_TAG_T type, posix_id *id)
2663 {
2664 while (list) {
2665 if (list->type == type && ((type != SMB_ACL_USER && type != SMB_ACL_GROUP) ||
2666 (type == SMB_ACL_USER && id && id->uid == list->unix_ug.uid) ||
2667 (type == SMB_ACL_GROUP && id && id->gid == list->unix_ug.gid)))
2668 break;
2669 list = list->next;
2670 }
2671 return list;
2672 }
2673
2674 /****************************************************************************
2675
2676 ****************************************************************************/
2677
2678 SMB_ACL_T free_empty_sys_acl(connection_struct *conn, SMB_ACL_T the_acl)
2679 {
2680 SMB_ACL_ENTRY_T entry;
2681
2682 if (!the_acl)
2683 return NULL;
2684 if (SMB_VFS_SYS_ACL_GET_ENTRY(conn, the_acl, SMB_ACL_FIRST_ENTRY, &entry) != 1) {
2685 SMB_VFS_SYS_ACL_FREE_ACL(conn, the_acl);
2686 return NULL;
2687 }
2688 return the_acl;
2689 }
2690
2691 /****************************************************************************
2692 Convert a canon_ace to a generic 3 element permission - if possible.
2693 ****************************************************************************/
2694
2695 #define MAP_PERM(p,mask,result) (((p) & (mask)) ? (result) : 0 )
2696
2697 static bool convert_canon_ace_to_posix_perms( files_struct *fsp, canon_ace *file_ace_list, mode_t *posix_perms)
2698 {
2699 int snum = SNUM(fsp->conn);
2700 size_t ace_count = count_canon_ace_list(file_ace_list);
2701 canon_ace *ace_p;
2702 canon_ace *owner_ace = NULL;
2703 canon_ace *group_ace = NULL;
2704 canon_ace *other_ace = NULL;
2705 mode_t and_bits;
2706 mode_t or_bits;
2707
2708 if (ace_count != 3) {
2709 DEBUG(3,("convert_canon_ace_to_posix_perms: Too many ACE entries for file %s to convert to \
2710 posix perms.\n", fsp->fsp_name ));
2711 return False;
2712 }
2713
2714 for (ace_p = file_ace_list; ace_p; ace_p = ace_p->next) {
2715 if (ace_p->owner_type == UID_ACE)
2716 owner_ace = ace_p;
2717 else if (ace_p->owner_type == GID_ACE)
2718 group_ace = ace_p;
2719 else if (ace_p->owner_type == WORLD_ACE)
2720 other_ace = ace_p;
2721 }
2722
2723 if (!owner_ace || !group_ace || !other_ace) {
2724 DEBUG(3,("convert_canon_ace_to_posix_perms: Can't get standard entries for file %s.\n",
2725 fsp->fsp_name ));
2726 return False;
2727 }
2728
2729 *posix_perms = (mode_t)0;
2730
2731 *posix_perms |= owner_ace->perms;
2732 *posix_perms |= MAP_PERM(group_ace->perms, S_IRUSR, S_IRGRP);
2733 *posix_perms |= MAP_PERM(group_ace->perms, S_IWUSR, S_IWGRP);
2734 *posix_perms |= MAP_PERM(group_ace->perms, S_IXUSR, S_IXGRP);
2735 *posix_perms |= MAP_PERM(other_ace->perms, S_IRUSR, S_IROTH);
2736 *posix_perms |= MAP_PERM(other_ace->perms, S_IWUSR, S_IWOTH);
2737 *posix_perms |= MAP_PERM(other_ace->perms, S_IXUSR, S_IXOTH);
2738
2739 /* The owner must have at least read access. */
2740
2741 *posix_perms |= S_IRUSR;
2742 if (fsp->is_directory)
2743 *posix_perms |= (S_IWUSR|S_IXUSR);
2744
2745 /* If requested apply the masks. */
2746
2747 /* Get the initial bits to apply. */
2748
2749 if (fsp->is_directory) {
2750 and_bits = lp_dir_security_mask(snum);
2751 or_bits = lp_force_dir_security_mode(snum);
2752 } else {
2753 and_bits = lp_security_mask(snum);
2754 or_bits = lp_force_security_mode(snum);
2755 }
2756
2757 *posix_perms = (((*posix_perms) & and_bits)|or_bits);
2758
2759 DEBUG(10,("convert_canon_ace_to_posix_perms: converted u=%o,g=%o,w=%o to perm=0%o for file %s.\n",
2760 (int)owner_ace->perms, (int)group_ace->perms, (int)other_ace->perms, (int)*posix_perms,
2761 fsp->fsp_name ));
2762
2763 return True;
2764 }
2765
2766 /****************************************************************************
2767 Incoming NT ACLs on a directory can be split into a default POSIX acl (CI|OI|IO) and
2768 a normal POSIX acl. Win2k needs these split acls re-merging into one ACL
2769 with CI|OI set so it is inherited and also applies to the directory.
2770 Based on code from "Jim McDonough" <jmcd@us.ibm.com>.
2771 ****************************************************************************/
2772
2773 static size_t merge_default_aces( SEC_ACE *nt_ace_list, size_t num_aces)
2774 {
2775 size_t i, j;
2776
2777 for (i = 0; i < num_aces; i++) {
2778 for (j = i+1; j < num_aces; j++) {
2779 uint32 i_flags_ni = (nt_ace_list[i].flags & ~SEC_ACE_FLAG_INHERITED_ACE);
2780 uint32 j_flags_ni = (nt_ace_list[j].flags & ~SEC_ACE_FLAG_INHERITED_ACE);
2781 bool i_inh = (nt_ace_list[i].flags & SEC_ACE_FLAG_INHERITED_ACE) ? True : False;
2782 bool j_inh = (nt_ace_list[j].flags & SEC_ACE_FLAG_INHERITED_ACE) ? True : False;
2783
2784 /* We know the lower number ACE's are file entries. */
2785 if ((nt_ace_list[i].type == nt_ace_list[j].type) &&
2786 (nt_ace_list[i].size == nt_ace_list[j].size) &&
2787 (nt_ace_list[i].access_mask == nt_ace_list[j].access_mask) &&
2788 sid_equal(&nt_ace_list[i].trustee, &nt_ace_list[j].trustee) &&
2789 (i_inh == j_inh) &&
2790 (i_flags_ni == 0) &&
2791 (j_flags_ni == (SEC_ACE_FLAG_OBJECT_INHERIT|
2792 SEC_ACE_FLAG_CONTAINER_INHERIT|
2793 SEC_ACE_FLAG_INHERIT_ONLY))) {
2794 /*
2795 * W2K wants to have access allowed zero access ACE's
2796 * at the end of the list. If the mask is zero, merge
2797 * the non-inherited ACE onto the inherited ACE.
2798 */
2799
2800 if (nt_ace_list[i].access_mask == 0) {
2801 nt_ace_list[j].flags = SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT|
2802 (i_inh ? SEC_ACE_FLAG_INHERITED_ACE : 0);
2803 if (num_aces - i - 1 > 0)
2804 memmove(&nt_ace_list[i], &nt_ace_list[i+1], (num_aces-i-1) *
2805 sizeof(SEC_ACE));
2806
2807 DEBUG(10,("merge_default_aces: Merging zero access ACE %u onto ACE %u.\n",
2808 (unsigned int)i, (unsigned int)j ));
2809 } else {
2810 /*
2811 * These are identical except for the flags.
2812 * Merge the inherited ACE onto the non-inherited ACE.
2813 */
2814
2815 nt_ace_list[i].flags = SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT|
2816 (i_inh ? SEC_ACE_FLAG_INHERITED_ACE : 0);
2817 if (num_aces - j - 1 > 0)
2818 memmove(&nt_ace_list[j], &nt_ace_list[j+1], (num_aces-j-1) *
2819 sizeof(SEC_ACE));
2820
2821 DEBUG(10,("merge_default_aces: Merging ACE %u onto ACE %u.\n",
2822 (unsigned int)j, (unsigned int)i ));
2823 }
2824 num_aces--;
2825 break;
2826 }
2827 }
2828 }
2829
2830 return num_aces;
2831 }
2832
2833 /*
2834 * Add or Replace ACE entry.
2835 * In some cases we need to add a specific ACE for compatibility reasons.
2836 * When doing that we must make sure we are not actually creating a duplicate
2837 * entry. So we need to search whether an ACE entry already exist and eventually
2838 * replacce the access mask, or add a completely new entry if none was found.
2839 *
2840 * This function assumes the array has enough space to add a new entry without
2841 * any reallocation of memory.
2842 */
2843
2844 static void add_or_replace_ace(SEC_ACE *nt_ace_list, size_t *num_aces,
2845 const DOM_SID *sid, enum security_ace_type type,
2846 uint32_t mask, uint8_t flags)
2847 {
2848 int i;
2849
2850 /* first search for a duplicate */
2851 for (i = 0; i < *num_aces; i++) {
2852 if (sid_equal(&nt_ace_list[i].trustee, sid) &&
2853 (nt_ace_list[i].flags == flags)) break;
2854 }
2855
2856 if (i < *num_aces) { /* found */
2857 nt_ace_list[i].type = type;
2858 nt_ace_list[i].access_mask = mask;
2859 DEBUG(10, ("Replacing ACE %d with SID %s and flags %02x\n",
2860 i, sid_string_dbg(sid), flags));
2861 return;
2862 }
2863
2864 /* not found, append it */
2865 init_sec_ace(&nt_ace_list[(*num_aces)++], sid, type, mask, flags);
2866 }
2867
2868
2869 /****************************************************************************
2870 Reply to query a security descriptor from an fsp. If it succeeds it allocates
2871 the space for the return elements and returns the size needed to return the
2872 security descriptor. This should be the only external function needed for
2873 the UNIX style get ACL.
2874 ****************************************************************************/
2875
2876 static NTSTATUS posix_get_nt_acl_common(struct connection_struct *conn,
2877 const char *name,
2878 const SMB_STRUCT_STAT *sbuf,
2879 struct pai_val *pal,
2880 SMB_ACL_T posix_acl,
2881 SMB_ACL_T def_acl,
2882 uint32_t security_info,
2883 SEC_DESC **ppdesc)
2884 {
2885 DOM_SID owner_sid;
2886 DOM_SID group_sid;
2887 size_t sd_size = 0;
2888 SEC_ACL *psa = NULL;
2889 size_t num_acls = 0;
2890 size_t num_def_acls = 0;
2891 size_t num_aces = 0;
2892 canon_ace *file_ace = NULL;
2893 canon_ace *dir_ace = NULL;
2894 SEC_ACE *nt_ace_list = NULL;
2895 size_t num_profile_acls = 0;
2896 DOM_SID orig_owner_sid;
2897 SEC_DESC *psd = NULL;
2898 int i;
2899
2900 /*
2901 * Get the owner, group and world SIDs.
2902 */
2903
2904 create_file_sids(sbuf, &owner_sid, &group_sid);
2905
2906 if (lp_profile_acls(SNUM(conn))) {
2907 /* For WXP SP1 the owner must be administrators. */
2908 sid_copy(&orig_owner_sid, &owner_sid);
2909 sid_copy(&owner_sid, &global_sid_Builtin_Administrators);
2910 sid_copy(&group_sid, &global_sid_Builtin_Users);
2911 num_profile_acls = 3;
2912 }
2913
2914 if ((security_info & DACL_SECURITY_INFORMATION) && !(security_info & PROTECTED_DACL_SECURITY_INFORMATION)) {
2915
2916 /*
2917 * In the optimum case Creator Owner and Creator Group would be used for
2918 * the ACL_USER_OBJ and ACL_GROUP_OBJ entries, respectively, but this
2919 * would lead to usability problems under Windows: The Creator entries
2920 * are only available in browse lists of directories and not for files;
2921 * additionally the identity of the owning group couldn't be determined.
2922 * We therefore use those identities only for Default ACLs.
2923 */
2924
2925 /* Create the canon_ace lists. */
2926 file_ace = canonicalise_acl(conn, name, posix_acl, sbuf,
2927 &owner_sid, &group_sid, pal,
2928 SMB_ACL_TYPE_ACCESS);
2929
2930 /* We must have *some* ACLS. */
2931
2932 if (count_canon_ace_list(file_ace) == 0) {
2933 DEBUG(0,("get_nt_acl : No ACLs on file (%s) !\n", name));
2934 goto done;
2935 }
2936
2937 if (S_ISDIR(sbuf->st_mode) && def_acl) {
2938 dir_ace = canonicalise_acl(conn, name, def_acl,
2939 sbuf,
2940 &global_sid_Creator_Owner,
2941 &global_sid_Creator_Group,
2942 pal, SMB_ACL_TYPE_DEFAULT);
2943 }
2944
2945 /*
2946 * Create the NT ACE list from the canonical ace lists.
2947 */
2948
2949 {
2950 canon_ace *ace;
2951 enum security_ace_type nt_acl_type;
2952
2953 if (nt4_compatible_acls() && dir_ace) {
2954 /*
2955 * NT 4 chokes if an ACL contains an INHERIT_ONLY entry
2956 * but no non-INHERIT_ONLY entry for one SID. So we only
2957 * remove entries from the Access ACL if the
2958 * corresponding Default ACL entries have also been
2959 * removed. ACEs for CREATOR-OWNER and CREATOR-GROUP
2960 * are exceptions. We can do nothing
2961 * intelligent if the Default ACL contains entries that
2962 * are not also contained in the Access ACL, so this
2963 * case will still fail under NT 4.
2964 */
2965
2966 ace = canon_ace_entry_for(dir_ace, SMB_ACL_OTHER, NULL);
2967 if (ace && !ace->perms) {
2968 DLIST_REMOVE(dir_ace, ace);
2969 SAFE_FREE(ace);
2970
2971 ace = canon_ace_entry_for(file_ace, SMB_ACL_OTHER, NULL);
2972 if (ace && !ace->perms) {
2973 DLIST_REMOVE(file_ace, ace);
2974 SAFE_FREE(ace);
2975 }
2976 }
2977
2978 /*
2979 * WinNT doesn't usually have Creator Group
2980 * in browse lists, so we send this entry to
2981 * WinNT even if it contains no relevant
2982 * permissions. Once we can add
2983 * Creator Group to browse lists we can
2984 * re-enable this.
2985 */
2986
2987 #if 0
2988 ace = canon_ace_entry_for(dir_ace, SMB_ACL_GROUP_OBJ, NULL);
2989 if (ace && !ace->perms) {
2990 DLIST_REMOVE(dir_ace, ace);
2991 SAFE_FREE(ace);
2992 }
2993 #endif
2994
2995 ace = canon_ace_entry_for(file_ace, SMB_ACL_GROUP_OBJ, NULL);
2996 if (ace && !ace->perms) {
2997 DLIST_REMOVE(file_ace, ace);
2998 SAFE_FREE(ace);
2999 }
3000 }
3001
3002 num_acls = count_canon_ace_list(file_ace);
3003 num_def_acls = count_canon_ace_list(dir_ace);
3004
3005 /* Allocate the ace list. */
3006 if ((nt_ace_list = SMB_MALLOC_ARRAY(SEC_ACE,num_acls + num_profile_acls + num_def_acls)) == NULL) {
3007 DEBUG(0,("get_nt_acl: Unable to malloc space for nt_ace_list.\n"));
3008 goto done;
3009 }
3010
3011 memset(nt_ace_list, '\0', (num_acls + num_def_acls) * sizeof(SEC_ACE) );
3012
3013 /*
3014 * Create the NT ACE list from the canonical ace lists.
3015 */
3016
3017 for (ace = file_ace; ace != NULL; ace = ace->next) {
3018 uint32_t acc = map_canon_ace_perms(SNUM(conn),
3019 &nt_acl_type,
3020 ace->perms,
3021 S_ISDIR(sbuf->st_mode));
3022 init_sec_ace(&nt_ace_list[num_aces++],
3023 &ace->trustee,
3024 nt_acl_type,
3025 acc,
3026 ace->inherited ?
3027 SEC_ACE_FLAG_INHERITED_ACE : 0);
3028 }
3029
3030 /* The User must have access to a profile share - even
3031 * if we can't map the SID. */
3032 if (lp_profile_acls(SNUM(conn))) {
3033 add_or_replace_ace(nt_ace_list, &num_aces,
3034 &global_sid_Builtin_Users,
3035 SEC_ACE_TYPE_ACCESS_ALLOWED,
3036 FILE_GENERIC_ALL, 0);
3037 }
3038
3039 for (ace = dir_ace; ace != NULL; ace = ace->next) {
3040 uint32_t acc = map_canon_ace_perms(SNUM(conn),
3041 &nt_acl_type,
3042 ace->perms,
3043 S_ISDIR(sbuf->st_mode));
3044 init_sec_ace(&nt_ace_list[num_aces++],
3045 &ace->trustee,
3046 nt_acl_type,
3047 acc,
3048 SEC_ACE_FLAG_OBJECT_INHERIT|
3049 SEC_ACE_FLAG_CONTAINER_INHERIT|
3050 SEC_ACE_FLAG_INHERIT_ONLY|
3051 (ace->inherited ?
3052 SEC_ACE_FLAG_INHERITED_ACE : 0));
3053 }
3054
3055 /* The User must have access to a profile share - even
3056 * if we can't map the SID. */
3057 if (lp_profile_acls(SNUM(conn))) {
3058 add_or_replace_ace(nt_ace_list, &num_aces,
3059 &global_sid_Builtin_Users,
3060 SEC_ACE_TYPE_ACCESS_ALLOWED,
3061 FILE_GENERIC_ALL,
3062 SEC_ACE_FLAG_OBJECT_INHERIT |
3063 SEC_ACE_FLAG_CONTAINER_INHERIT |
3064 SEC_ACE_FLAG_INHERIT_ONLY);
3065 }
3066
3067 /*
3068 * Merge POSIX default ACLs and normal ACLs into one NT ACE.
3069 * Win2K needs this to get the inheritance correct when replacing ACLs
3070 * on a directory tree. Based on work by Jim @ IBM.
3071 */
3072
3073 num_aces = merge_default_aces(nt_ace_list, num_aces);
3074
3075 if (lp_profile_acls(SNUM(conn))) {
3076 for (i = 0; i < num_aces; i++) {
3077 if (sid_equal(&nt_ace_list[i].trustee, &owner_sid)) {
3078 add_or_replace_ace(nt_ace_list, &num_aces,
3079 &orig_owner_sid,
3080 nt_ace_list[i].type,
3081 nt_ace_list[i].access_mask,
3082 nt_ace_list[i].flags);
3083 break;
3084 }
3085 }
3086 }
3087 }
3088
3089 if (num_aces) {
3090 if((psa = make_sec_acl( talloc_tos(), NT4_ACL_REVISION, num_aces, nt_ace_list)) == NULL) {
3091 DEBUG(0,("get_nt_acl: Unable to malloc space for acl.\n"));
3092 goto done;
3093 }
3094 }
3095 } /* security_info & DACL_SECURITY_INFORMATION */
3096
3097 psd = make_standard_sec_desc( talloc_tos(),
3098 (security_info & OWNER_SECURITY_INFORMATION) ? &owner_sid : NULL,
3099 (security_info & GROUP_SECURITY_INFORMATION) ? &group_sid : NULL,
3100 psa,
3101 &sd_size);
3102
3103 if(!psd) {
3104 DEBUG(0,("get_nt_acl: Unable to malloc space for security descriptor.\n"));
3105 sd_size = 0;
3106 goto done;
3107 }
3108
3109 /*
3110 * Windows 2000: The DACL_PROTECTED flag in the security
3111 * descriptor marks the ACL as non-inheriting, i.e., no
3112 * ACEs from higher level directories propagate to this
3113 * ACL. In the POSIX ACL model permissions are only
3114 * inherited at file create time, so ACLs never contain
3115 * any ACEs that are inherited dynamically. The DACL_PROTECTED
3116 * flag doesn't seem to bother Windows NT.
3117 * Always set this if map acl inherit is turned off.
3118 */
3119 if (get_protected_flag(pal) || !lp_map_acl_inherit(SNUM(conn))) {
3120 psd->type |= SE_DESC_DACL_PROTECTED;
3121 }
3122
3123 if (psd->dacl) {
3124 dacl_sort_into_canonical_order(psd->dacl->aces, (unsigned int)psd->dacl->num_aces);
3125 }
3126
3127 *ppdesc = psd;
3128
3129 done:
3130
3131 if (posix_acl) {
3132 SMB_VFS_SYS_ACL_FREE_ACL(conn, posix_acl);
3133 }
3134 if (def_acl) {
3135 SMB_VFS_SYS_ACL_FREE_ACL(conn, def_acl);
3136 }
3137 free_canon_ace_list(file_ace);
3138 free_canon_ace_list(dir_ace);
3139 free_inherited_info(pal);
3140 SAFE_FREE(nt_ace_list);
3141
3142 return NT_STATUS_OK;
3143 }
3144
3145 NTSTATUS posix_fget_nt_acl(struct files_struct *fsp, uint32_t security_info,
3146 SEC_DESC **ppdesc)
3147 {
3148 SMB_STRUCT_STAT sbuf;
3149 SMB_ACL_T posix_acl = NULL;
3150 struct pai_val *pal;
3151
3152 *ppdesc = NULL;
3153
3154 DEBUG(10,("posix_fget_nt_acl: called for file %s\n", fsp->fsp_name ));
3155
3156 /* can it happen that fsp_name == NULL ? */
3157 if (fsp->is_directory || fsp->fh->fd == -1) {
3158 return posix_get_nt_acl(fsp->conn, fsp->fsp_name,
3159 security_info, ppdesc);
3160 }
3161
3162 /* Get the stat struct for the owner info. */
3163 if(SMB_VFS_FSTAT(fsp, &sbuf) != 0) {
3164 return map_nt_error_from_unix(errno);
3165 }
3166
3167 /* Get the ACL from the fd. */
3168 posix_acl = SMB_VFS_SYS_ACL_GET_FD(fsp);
3169
3170 pal = fload_inherited_info(fsp);
3171
3172 return posix_get_nt_acl_common(fsp->conn, fsp->fsp_name, &sbuf, pal,
3173 posix_acl, NULL, security_info, ppdesc);
3174 }
3175
3176 NTSTATUS posix_get_nt_acl(struct connection_struct *conn, const char *name,
3177 uint32_t security_info, SEC_DESC **ppdesc)
3178 {
3179 SMB_STRUCT_STAT sbuf;
3180 SMB_ACL_T posix_acl = NULL;
3181 SMB_ACL_T def_acl = NULL;
3182 struct pai_val *pal;
3183
3184 *ppdesc = NULL;
3185
3186 DEBUG(10,("posix_get_nt_acl: called for file %s\n", name ));
3187
3188 /* Get the stat struct for the owner info. */
3189 if(SMB_VFS_STAT(conn, name, &sbuf) != 0) {
3190 return map_nt_error_from_unix(errno);
3191 }
3192
3193 /* Get the ACL from the path. */
3194 posix_acl = SMB_VFS_SYS_ACL_GET_FILE(conn, name, SMB_ACL_TYPE_ACCESS);
3195
3196 /* If it's a directory get the default POSIX ACL. */
3197 if(S_ISDIR(sbuf.st_mode)) {
3198 def_acl = SMB_VFS_SYS_ACL_GET_FILE(conn, name, SMB_ACL_TYPE_DEFAULT);
3199 def_acl = free_empty_sys_acl(conn, def_acl);
3200 }
3201
3202 pal = load_inherited_info(conn, name);
3203
3204 return posix_get_nt_acl_common(conn, name, &sbuf, pal, posix_acl,
3205 def_acl, security_info, ppdesc);
3206 }
3207
3208 /****************************************************************************
3209 Try to chown a file. We will be able to chown it under the following conditions.
3210
3211 1) If we have root privileges, then it will just work.
3212 2) If we have SeTakeOwnershipPrivilege we can change the user to the current user.
3213 3) If we have SeRestorePrivilege we can change the user to any other user.
3214 4) If we have write permission to the file and dos_filemodes is set
3215 then allow chown to the currently authenticated user.
3216 ****************************************************************************/
3217
3218 int try_chown(connection_struct *conn, const char *fname, uid_t uid, gid_t gid)
3219 {
3220 int ret;
3221 files_struct *fsp;
3222 SMB_STRUCT_STAT st;
3223
3224 if(!CAN_WRITE(conn)) {
3225 return -1;
3226 }
3227
3228 /* Case (1). */
3229 /* try the direct way first */
3230 ret = SMB_VFS_CHOWN(conn, fname, uid, gid);
3231 if (ret == 0)
3232 return 0;
3233
3234 /* Case (2) / (3) */
3235 if (lp_enable_privileges()) {
3236
3237 bool has_take_ownership_priv = user_has_privileges(current_user.nt_user_token,
3238 &se_take_ownership);
3239 bool has_restore_priv = user_has_privileges(current_user.nt_user_token,
3240 &se_restore);
3241
3242 /* Case (2) */
3243 if ( ( has_take_ownership_priv && ( uid == current_user.ut.uid ) ) ||
3244 /* Case (3) */
3245 ( has_restore_priv ) ) {
3246
3247 become_root();
3248 /* Keep the current file gid the same - take ownership doesn't imply group change. */
3249 ret = SMB_VFS_CHOWN(conn, fname, uid, (gid_t)-1);
3250 unbecome_root();
3251 return ret;
3252 }
3253 }
3254
3255 /* Case (4). */
3256 if (!lp_dos_filemode(SNUM(conn))) {
3257 errno = EPERM;
3258 return -1;
3259 }
3260
3261 /* only allow chown to the current user. This is more secure,
3262 and also copes with the case where the SID in a take ownership ACL is
3263 a local SID on the users workstation
3264 */
3265 if (uid != current_user.ut.uid) {
3266 errno = EPERM;
3267 return -1;
3268 }
3269
3270 if (SMB_VFS_STAT(conn,fname,&st)) {
3271 return -1;
3272 }
3273
3274 if (!NT_STATUS_IS_OK(open_file_fchmod(conn,fname,&st,&fsp))) {
3275 return -1;
3276 }
3277
3278 become_root();
3279 /* Keep the current file gid the same. */
3280 ret = SMB_VFS_FCHOWN(fsp, uid, (gid_t)-1);
3281 unbecome_root();
3282
3283 close_file_fchmod(fsp);
3284
3285 return ret;
3286 }
3287
3288 #if 0
3289 /* Disable this - prevents ACL inheritance from the ACL editor. JRA. */
3290
3291 /****************************************************************************
3292 Take care of parent ACL inheritance.
3293 ****************************************************************************/
3294
3295 NTSTATUS append_parent_acl(files_struct *fsp,
3296 const SEC_DESC *pcsd,
3297 SEC_DESC **pp_new_sd)
3298 {
3299 SEC_DESC *parent_sd = NULL;
3300 files_struct *parent_fsp = NULL;
3301 TALLOC_CTX *mem_ctx = talloc_tos();
3302 char *parent_name = NULL;
3303 SEC_ACE *new_ace = NULL;
3304 unsigned int num_aces = pcsd->dacl->num_aces;
3305 SMB_STRUCT_STAT sbuf;
3306 NTSTATUS status;
3307 int info;
3308 unsigned int i, j;
3309 SEC_DESC *psd = dup_sec_desc(talloc_tos(), pcsd);
3310 bool is_dacl_protected = (pcsd->type & SE_DESC_DACL_PROTECTED);
3311
3312 ZERO_STRUCT(sbuf);
3313
3314 if (psd == NULL) {
3315 return NT_STATUS_NO_MEMORY;
3316 }
3317
3318 if (!parent_dirname_talloc(mem_ctx,
3319 fsp->fsp_name,
3320 &parent_name,
3321 NULL)) {
3322 return NT_STATUS_NO_MEMORY;
3323 }
3324
3325 status = open_directory(fsp->conn,
3326 NULL,
3327 parent_name,
3328 &sbuf,
3329 FILE_READ_ATTRIBUTES, /* Just a stat open */
3330 FILE_SHARE_NONE, /* Ignored for stat opens */
3331 FILE_OPEN,
3332 0,
3333 INTERNAL_OPEN_ONLY,
3334 &info,
3335 &parent_fsp);
3336
3337 if (!NT_STATUS_IS_OK(status)) {
3338 return status;
3339 }
3340
3341 status = SMB_VFS_GET_NT_ACL(parent_fsp->conn, parent_fsp->fsp_name,
3342 DACL_SECURITY_INFORMATION, &parent_sd );
3343
3344 close_file(parent_fsp, NORMAL_CLOSE);
3345
3346 if (!NT_STATUS_IS_OK(status)) {
3347 return status;
3348 }
3349
3350 /*
3351 * Make room for potentially all the ACLs from
3352 * the parent. We used to add the ugw triple here,
3353 * as we knew we were dealing with POSIX ACLs.
3354 * We no longer need to do so as we can guarentee
3355 * that a default ACL from the parent directory will
3356 * be well formed for POSIX ACLs if it came from a
3357 * POSIX ACL source, and if we're not writing to a
3358 * POSIX ACL sink then we don't care if it's not well
3359 * formed. JRA.
3360 */
3361
3362 num_aces += parent_sd->dacl->num_aces;
3363
3364 if((new_ace = TALLOC_ZERO_ARRAY(mem_ctx, SEC_ACE,
3365 num_aces)) == NULL) {
3366 return NT_STATUS_NO_MEMORY;
3367 }
3368
3369 /* Start by copying in all the given ACE entries. */
3370 for (i = 0; i < psd->dacl->num_aces; i++) {
3371 sec_ace_copy(&new_ace[i], &psd->dacl->aces[i]);
3372 }
3373
3374 /*
3375 * Note that we're ignoring "inherit permissions" here
3376 * as that really only applies to newly created files. JRA.
3377 */
3378
3379 /* Finally append any inherited ACEs. */
3380 for (j = 0; j < parent_sd->dacl->num_aces; j++) {
3381 SEC_ACE *se = &parent_sd->dacl->aces[j];
3382
3383 if (fsp->is_directory) {
3384 if (!(se->flags & SEC_ACE_FLAG_CONTAINER_INHERIT)) {
3385 /* Doesn't apply to a directory - ignore. */
3386 DEBUG(10,("append_parent_acl: directory %s "
3387 "ignoring non container "
3388 "inherit flags %u on ACE with sid %s "
3389 "from parent %s\n",
3390 fsp->fsp_name,
3391 (unsigned int)se->flags,
3392 sid_string_dbg(&se->trustee),
3393 parent_name));
3394 continue;
3395 }
3396 } else {
3397 if (!(se->flags & SEC_ACE_FLAG_OBJECT_INHERIT)) {
3398 /* Doesn't apply to a file - ignore. */
3399 DEBUG(10,("append_parent_acl: file %s "
3400 "ignoring non object "
3401 "inherit flags %u on ACE with sid %s "
3402 "from parent %s\n",
3403 fsp->fsp_name,
3404 (unsigned int)se->flags,
3405 sid_string_dbg(&se->trustee),
3406 parent_name));
3407 continue;
3408 }
3409 }
3410
3411 if (is_dacl_protected) {
3412 /* If the DACL is protected it means we must
3413 * not overwrite an existing ACE entry with the
3414 * same SID. This is order N^2. Ouch :-(. JRA. */
3415 unsigned int k;
3416 for (k = 0; k < psd->dacl->num_aces; k++) {
3417 if (sid_equal(&psd->dacl->aces[k].trustee,
3418 &se->trustee)) {
3419 break;
3420 }
3421 }
3422 if (k < psd->dacl->num_aces) {
3423 /* SID matched. Ignore. */
3424 DEBUG(10,("append_parent_acl: path %s "
3425 "ignoring ACE with protected sid %s "
3426 "from parent %s\n",
3427 fsp->fsp_name,
3428 sid_string_dbg(&se->trustee),
3429 parent_name));
3430 continue;
3431 }
3432 }
3433
3434 sec_ace_copy(&new_ace[i], se);
3435 if (se->flags & SEC_ACE_FLAG_NO_PROPAGATE_INHERIT) {
3436 new_ace[i].flags &= ~(SEC_ACE_FLAG_VALID_INHERIT);
3437 }
3438 new_ace[i].flags |= SEC_ACE_FLAG_INHERITED_ACE;
3439
3440 if (fsp->is_directory) {
3441 /*
3442 * Strip off any inherit only. It's applied.
3443 */
3444 new_ace[i].flags &= ~(SEC_ACE_FLAG_INHERIT_ONLY);
3445 if (se->flags & SEC_ACE_FLAG_NO_PROPAGATE_INHERIT) {
3446 /* No further inheritance. */
3447 new_ace[i].flags &=
3448 ~(SEC_ACE_FLAG_CONTAINER_INHERIT|
3449 SEC_ACE_FLAG_OBJECT_INHERIT);
3450 }
3451 } else {
3452 /*
3453 * Strip off any container or inherit
3454 * flags, they can't apply to objects.
3455 */
3456 new_ace[i].flags &= ~(SEC_ACE_FLAG_CONTAINER_INHERIT|
3457 SEC_ACE_FLAG_INHERIT_ONLY|
3458 SEC_ACE_FLAG_NO_PROPAGATE_INHERIT);
3459 }
3460 i++;
3461
3462 DEBUG(10,("append_parent_acl: path %s "
3463 "inheriting ACE with sid %s "
3464 "from parent %s\n",
3465 fsp->fsp_name,
3466 sid_string_dbg(&se->trustee),
3467 parent_name));
3468 }
3469
3470 psd->dacl->aces = new_ace;
3471 psd->dacl->num_aces = i;
3472 psd->type &= ~(SE_DESC_DACL_AUTO_INHERITED|
3473 SE_DESC_DACL_AUTO_INHERIT_REQ);
3474
3475 *pp_new_sd = psd;
3476 return status;
3477 }
3478 #endif
3479
3480 /****************************************************************************
3481 Reply to set a security descriptor on an fsp. security_info_sent is the
3482 description of the following NT ACL.
3483 This should be the only external function needed for the UNIX style set ACL.
3484 ****************************************************************************/
3485
3486 NTSTATUS set_nt_acl(files_struct *fsp, uint32 security_info_sent, const SEC_DESC *psd)
3487 {
3488 connection_struct *conn = fsp->conn;
3489 uid_t user = (uid_t)-1;
3490 gid_t grp = (gid_t)-1;
3491 SMB_STRUCT_STAT sbuf;
3492 DOM_SID file_owner_sid;
3493 DOM_SID file_grp_sid;
3494 canon_ace *file_ace_list = NULL;
3495 canon_ace *dir_ace_list = NULL;
3496 bool acl_perms = False;
3497 mode_t orig_mode = (mode_t)0;
3498 NTSTATUS status;
3499 bool set_acl_as_root = false;
3500 bool acl_set_support = false;
3501 bool ret = false;
3502
3503 DEBUG(10,("set_nt_acl: called for file %s\n", fsp->fsp_name ));
3504
3505 if (!CAN_WRITE(conn)) {
3506 DEBUG(10,("set acl rejected on read-only share\n"));
3507 return NT_STATUS_MEDIA_WRITE_PROTECTED;
3508 }
3509
3510 /*
3511 * Get the current state of the file.
3512 */
3513
3514 if(fsp->is_directory || fsp->fh->fd == -1) {
3515 if(SMB_VFS_STAT(fsp->conn,fsp->fsp_name, &sbuf) != 0)
3516 return map_nt_error_from_unix(errno);
3517 } else {
3518 if(SMB_VFS_FSTAT(fsp, &sbuf) != 0)
3519 return map_nt_error_from_unix(errno);
3520 }
3521
3522 /* Save the original element we check against. */
3523 orig_mode = sbuf.st_mode;
3524
3525 /*
3526 * Unpack the user/group/world id's.
3527 */
3528
3529 status = unpack_nt_owners( SNUM(conn), &user, &grp, security_info_sent, psd);
3530 if (!NT_STATUS_IS_OK(status)) {
3531 return status;
3532 }
3533
3534 /*
3535 * Do we need to chown ? If so this must be done first as the incoming
3536 * CREATOR_OWNER acl will be relative to the *new* owner, not the old.
3537 * Noticed by Simo.
3538 */
3539
3540 if (((user != (uid_t)-1) && (sbuf.st_uid != user)) || (( grp != (gid_t)-1) && (sbuf.st_gid != grp))) {
3541
3542 DEBUG(3,("set_nt_acl: chown %s. uid = %u, gid = %u.\n",
3543 fsp->fsp_name, (unsigned int)user, (unsigned int)grp ));
3544
3545 if(try_chown( fsp->conn, fsp->fsp_name, user, grp) == -1) {
3546 DEBUG(3,("set_nt_acl: chown %s, %u, %u failed. Error = %s.\n",
3547 fsp->fsp_name, (unsigned int)user, (unsigned int)grp, strerror(errno) ));
3548 if (errno == EPERM) {
3549 return NT_STATUS_INVALID_OWNER;
3550 }
3551 return map_nt_error_from_unix(errno);
3552 }
3553
3554 /*
3555 * Recheck the current state of the file, which may have changed.
3556 * (suid/sgid bits, for instance)
3557 */
3558
3559 if(fsp->is_directory) {
3560 if(SMB_VFS_STAT(fsp->conn, fsp->fsp_name, &sbuf) != 0) {
3561 return map_nt_error_from_unix(errno);
3562 }
3563 } else {
3564
3565 int sret;
3566
3567 if(fsp->fh->fd == -1)
3568 sret = SMB_VFS_STAT(fsp->conn, fsp->fsp_name, &sbuf);
3569 else
3570 sret = SMB_VFS_FSTAT(fsp, &sbuf);
3571
3572 if(sret != 0)
3573 return map_nt_error_from_unix(errno);
3574 }
3575
3576 /* Save the original element we check against. */
3577 orig_mode = sbuf.st_mode;
3578
3579 /* If we successfully chowned, we know we must
3580 * be able to set the acl, so do it as root.
3581 */
3582 set_acl_as_root = true;
3583 }
3584
3585 create_file_sids(&sbuf, &file_owner_sid, &file_grp_sid);
3586
3587 acl_perms = unpack_canon_ace( fsp, &sbuf, &file_owner_sid, &file_grp_sid,
3588 &file_ace_list, &dir_ace_list, security_info_sent, psd);
3589
3590 /* Ignore W2K traverse DACL set. */
3591 if (!file_ace_list && !dir_ace_list) {
3592 return NT_STATUS_OK;
3593 }
3594
3595 if (!acl_perms) {
3596 DEBUG(3,("set_nt_acl: cannot set permissions\n"));
3597 free_canon_ace_list(file_ace_list);
3598 free_canon_ace_list(dir_ace_list);
3599 return NT_STATUS_ACCESS_DENIED;
3600 }
3601
3602 /*
3603 * Only change security if we got a DACL.
3604 */
3605
3606 if(!(security_info_sent & DACL_SECURITY_INFORMATION) || (psd->dacl == NULL)) {
3607 free_canon_ace_list(file_ace_list);
3608 free_canon_ace_list(dir_ace_list);
3609 return NT_STATUS_OK;
3610 }
3611
3612 /*
3613 * Try using the POSIX ACL set first. Fall back to chmod if
3614 * we have no ACL support on this filesystem.
3615 */
3616
3617 if (acl_perms && file_ace_list) {
3618 if (set_acl_as_root) {
3619 become_root();
3620 }
3621 ret = set_canon_ace_list(fsp, file_ace_list, False, sbuf.st_gid, &acl_set_support);
3622 if (set_acl_as_root) {
3623 unbecome_root();
3624 }
3625 if (acl_set_support && ret == false) {
3626 DEBUG(3,("set_nt_acl: failed to set file acl on file %s (%s).\n", fsp->fsp_name, strerror(errno) ));
3627 free_canon_ace_list(file_ace_list);
3628 free_canon_ace_list(dir_ace_list);
3629 return map_nt_error_from_unix(errno);
3630 }
3631 }
3632
3633 if (acl_perms && acl_set_support && fsp->is_directory) {
3634 if (dir_ace_list) {
3635 if (set_acl_as_root) {
3636 become_root();
3637 }
3638 ret = set_canon_ace_list(fsp, dir_ace_list, True, sbuf.st_gid, &acl_set_support);
3639 if (set_acl_as_root) {
3640 unbecome_root();
3641 }
3642 if (ret == false) {
3643 DEBUG(3,("set_nt_acl: failed to set default acl on directory %s (%s).\n", fsp->fsp_name, strerror(errno) ));
3644 free_canon_ace_list(file_ace_list);
3645 free_canon_ace_list(dir_ace_list);
3646 return map_nt_error_from_unix(errno);
3647 }
3648 } else {
3649 int sret = -1;
3650
3651 /*
3652 * No default ACL - delete one if it exists.
3653 */
3654
3655 if (set_acl_as_root) {
3656 become_root();
3657 }
3658 sret = SMB_VFS_SYS_ACL_DELETE_DEF_FILE(conn, fsp->fsp_name);
3659 if (set_acl_as_root) {
3660 unbecome_root();
3661 }
3662 if (sret == -1) {
3663 if (acl_group_override(conn, sbuf.st_gid, fsp->fsp_name)) {
3664 DEBUG(5,("set_nt_acl: acl group control on and "
3665 "current user in file %s primary group. Override delete_def_acl\n",
3666 fsp->fsp_name ));
3667
3668 become_root();
3669 sret = SMB_VFS_SYS_ACL_DELETE_DEF_FILE(conn, fsp->fsp_name);
3670 unbecome_root();
3671 }
3672
3673 if (sret == -1) {
3674 DEBUG(3,("set_nt_acl: sys_acl_delete_def_file failed (%s)\n", strerror(errno)));
3675 free_canon_ace_list(file_ace_list);
3676 free_canon_ace_list(dir_ace_list);
3677 return map_nt_error_from_unix(errno);
3678 }
3679 }
3680 }
3681 }
3682
3683 if (acl_set_support) {
3684 if (set_acl_as_root) {
3685 become_root();
3686 }
3687 store_inheritance_attributes(fsp, file_ace_list, dir_ace_list,
3688 (psd->type & SE_DESC_DACL_PROTECTED) ? True : False);
3689 if (set_acl_as_root) {
3690 unbecome_root();
3691 }
3692 }
3693
3694 /*
3695 * If we cannot set using POSIX ACLs we fall back to checking if we need to chmod.
3696 */
3697
3698 if(!acl_set_support && acl_perms) {
3699 mode_t posix_perms;
3700
3701 if (!convert_canon_ace_to_posix_perms( fsp, file_ace_list, &posix_perms)) {
3702 free_canon_ace_list(file_ace_list);
3703 free_canon_ace_list(dir_ace_list);
3704 DEBUG(3,("set_nt_acl: failed to convert file acl to posix permissions for file %s.\n",
3705 fsp->fsp_name ));
3706 return NT_STATUS_ACCESS_DENIED;
3707 }
3708
3709 if (orig_mode != posix_perms) {
3710 int sret = -1;
3711
3712 DEBUG(3,("set_nt_acl: chmod %s. perms = 0%o.\n",
3713 fsp->fsp_name, (unsigned int)posix_perms ));
3714
3715 if (set_acl_as_root) {
3716 become_root();
3717 }
3718 sret = SMB_VFS_CHMOD(conn,fsp->fsp_name, posix_perms);
3719 if (set_acl_as_root) {
3720 unbecome_root();
3721 }
3722 if(sret == -1) {
3723 if (acl_group_override(conn, sbuf.st_gid, fsp->fsp_name)) {
3724 DEBUG(5,("set_nt_acl: acl group control on and "
3725 "current user in file %s primary group. Override chmod\n",
3726 fsp->fsp_name ));
3727
3728 become_root();
3729 sret = SMB_VFS_CHMOD(conn,fsp->fsp_name, posix_perms);
3730 unbecome_root();
3731 }
3732
3733 if (sret == -1) {
3734 DEBUG(3,("set_nt_acl: chmod %s, 0%o failed. Error = %s.\n",
3735 fsp->fsp_name, (unsigned int)posix_perms, strerror(errno) ));
3736 free_canon_ace_list(file_ace_list);
3737 free_canon_ace_list(dir_ace_list);
3738 return map_nt_error_from_unix(errno);
3739 }
3740 }
3741 }
3742 }
3743
3744 free_canon_ace_list(file_ace_list);
3745 free_canon_ace_list(dir_ace_list);
3746
3747 return NT_STATUS_OK;
3748 }
3749
3750 /****************************************************************************
3751 Get the actual group bits stored on a file with an ACL. Has no effect if
3752 the file has no ACL. Needed in dosmode code where the stat() will return
3753 the mask bits, not the real group bits, for a file with an ACL.
3754 ****************************************************************************/
3755
3756 int get_acl_group_bits( connection_struct *conn, const char *fname, mode_t *mode )
3757 {
3758 int entry_id = SMB_ACL_FIRST_ENTRY;
3759 SMB_ACL_ENTRY_T entry;
3760 SMB_ACL_T posix_acl;
3761 int result = -1;
3762
3763 posix_acl = SMB_VFS_SYS_ACL_GET_FILE(conn, fname, SMB_ACL_TYPE_ACCESS);
3764 if (posix_acl == (SMB_ACL_T)NULL)
3765 return -1;
3766
3767 while (SMB_VFS_SYS_ACL_GET_ENTRY(conn, posix_acl, entry_id, &entry) == 1) {
3768 SMB_ACL_TAG_T tagtype;
3769 SMB_ACL_PERMSET_T permset;
3770
3771 entry_id = SMB_ACL_NEXT_ENTRY;
3772
3773 if (SMB_VFS_SYS_ACL_GET_TAG_TYPE(conn, entry, &tagtype) ==-1)
3774 break;
3775
3776 if (tagtype == SMB_ACL_GROUP_OBJ) {
3777 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, entry, &permset) == -1) {
3778 break;
3779 } else {
3780 *mode &= ~(S_IRGRP|S_IWGRP|S_IXGRP);
3781 *mode |= (SMB_VFS_SYS_ACL_GET_PERM(conn, permset, SMB_ACL_READ) ? S_IRGRP : 0);
3782 *mode |= (SMB_VFS_SYS_ACL_GET_PERM(conn, permset, SMB_ACL_WRITE) ? S_IWGRP : 0);
3783 *mode |= (SMB_VFS_SYS_ACL_GET_PERM(conn, permset, SMB_ACL_EXECUTE) ? S_IXGRP : 0);
3784 result = 0;
3785 break;
3786 }
3787 }
3788 }
3789 SMB_VFS_SYS_ACL_FREE_ACL(conn, posix_acl);
3790 return result;
3791 }
3792
3793 /****************************************************************************
3794 Do a chmod by setting the ACL USER_OBJ, GROUP_OBJ and OTHER bits in an ACL
3795 and set the mask to rwx. Needed to preserve complex ACLs set by NT.
3796 ****************************************************************************/
3797
3798 static int chmod_acl_internals( connection_struct *conn, SMB_ACL_T posix_acl, mode_t mode)
3799 {
3800 int entry_id = SMB_ACL_FIRST_ENTRY;
3801 SMB_ACL_ENTRY_T entry;
3802 int num_entries = 0;
3803
3804 while ( SMB_VFS_SYS_ACL_GET_ENTRY(conn, posix_acl, entry_id, &entry) == 1) {
3805 SMB_ACL_TAG_T tagtype;
3806 SMB_ACL_PERMSET_T permset;
3807 mode_t perms;
3808
3809 entry_id = SMB_ACL_NEXT_ENTRY;
3810
3811 if (SMB_VFS_SYS_ACL_GET_TAG_TYPE(conn, entry, &tagtype) == -1)
3812 return -1;
3813
3814 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, entry, &permset) == -1)
3815 return -1;
3816
3817 num_entries++;
3818
3819 switch(tagtype) {
3820 case SMB_ACL_USER_OBJ:
3821 perms = unix_perms_to_acl_perms(mode, S_IRUSR, S_IWUSR, S_IXUSR);
3822 break;
3823 case SMB_ACL_GROUP_OBJ:
3824 perms = unix_perms_to_acl_perms(mode, S_IRGRP, S_IWGRP, S_IXGRP);
3825 break;
3826 case SMB_ACL_MASK:
3827 /*
3828 * FIXME: The ACL_MASK entry permissions should really be set to
3829 * the union of the permissions of all ACL_USER,
3830 * ACL_GROUP_OBJ, and ACL_GROUP entries. That's what
3831 * acl_calc_mask() does, but Samba ACLs doesn't provide it.
3832 */
3833 perms = S_IRUSR|S_IWUSR|S_IXUSR;
3834 break;
3835 case SMB_ACL_OTHER:
3836 perms = unix_perms_to_acl_perms(mode, S_IROTH, S_IWOTH, S_IXOTH);
3837 break;
3838 default:
3839 continue;
3840 }
3841
3842 if (map_acl_perms_to_permset(conn, perms, &permset) == -1)
3843 return -1;
3844
3845 if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, entry, permset) == -1)
3846 return -1;
3847 }
3848
3849 /*
3850 * If this is a simple 3 element ACL or no elements then it's a standard
3851 * UNIX permission set. Just use chmod...
3852 */
3853
3854 if ((num_entries == 3) || (num_entries == 0))
3855 return -1;
3856
3857 return 0;
3858 }
3859
3860 /****************************************************************************
3861 Get the access ACL of FROM, do a chmod by setting the ACL USER_OBJ,
3862 GROUP_OBJ and OTHER bits in an ACL and set the mask to rwx. Set the
3863 resulting ACL on TO. Note that name is in UNIX character set.
3864 ****************************************************************************/
3865
3866 static int copy_access_posix_acl(connection_struct *conn, const char *from, const char *to, mode_t mode)
3867 {
3868 SMB_ACL_T posix_acl = NULL;
3869 int ret = -1;
3870
3871 if ((posix_acl = SMB_VFS_SYS_ACL_GET_FILE(conn, from, SMB_ACL_TYPE_ACCESS)) == NULL)
3872 return -1;
3873
3874 if ((ret = chmod_acl_internals(conn, posix_acl, mode)) == -1)
3875 goto done;
3876
3877 ret = SMB_VFS_SYS_ACL_SET_FILE(conn, to, SMB_ACL_TYPE_ACCESS, posix_acl);
3878
3879 done:
3880
3881 SMB_VFS_SYS_ACL_FREE_ACL(conn, posix_acl);
3882 return ret;
3883 }
3884
3885 /****************************************************************************
3886 Do a chmod by setting the ACL USER_OBJ, GROUP_OBJ and OTHER bits in an ACL
3887 and set the mask to rwx. Needed to preserve complex ACLs set by NT.
3888 Note that name is in UNIX character set.
3889 ****************************************************************************/
3890
3891 int chmod_acl(connection_struct *conn, const char *name, mode_t mode)
3892 {
3893 return copy_access_posix_acl(conn, name, name, mode);
3894 }
3895
3896 /****************************************************************************
3897 Check for an existing default POSIX ACL on a directory.
3898 ****************************************************************************/
3899
3900 static bool directory_has_default_posix_acl(connection_struct *conn, const char *fname)
3901 {
3902 SMB_ACL_T def_acl = SMB_VFS_SYS_ACL_GET_FILE( conn, fname, SMB_ACL_TYPE_DEFAULT);
3903 bool has_acl = False;
3904 SMB_ACL_ENTRY_T entry;
3905
3906 if (def_acl != NULL && (SMB_VFS_SYS_ACL_GET_ENTRY(conn, def_acl, SMB_ACL_FIRST_ENTRY, &entry) == 1)) {
3907 has_acl = True;
3908 }
3909
3910 if (def_acl) {
3911 SMB_VFS_SYS_ACL_FREE_ACL(conn, def_acl);
3912 }
3913 return has_acl;
3914 }
3915
3916 /****************************************************************************
3917 If the parent directory has no default ACL but it does have an Access ACL,
3918 inherit this Access ACL to file name.
3919 ****************************************************************************/
3920
3921 int inherit_access_posix_acl(connection_struct *conn, const char *inherit_from_dir,
3922 const char *name, mode_t mode)
3923 {
3924 if (directory_has_default_posix_acl(conn, inherit_from_dir))
3925 return 0;
3926
3927 return copy_access_posix_acl(conn, inherit_from_dir, name, mode);
3928 }
3929
3930 /****************************************************************************
3931 Do an fchmod by setting the ACL USER_OBJ, GROUP_OBJ and OTHER bits in an ACL
3932 and set the mask to rwx. Needed to preserve complex ACLs set by NT.
3933 ****************************************************************************/
3934
3935 int fchmod_acl(files_struct *fsp, mode_t mode)
3936 {
3937 connection_struct *conn = fsp->conn;
3938 SMB_ACL_T posix_acl = NULL;
3939 int ret = -1;
3940
3941 if ((posix_acl = SMB_VFS_SYS_ACL_GET_FD(fsp)) == NULL)
3942 return -1;
3943
3944 if ((ret = chmod_acl_internals(conn, posix_acl, mode)) == -1)
3945 goto done;
3946
3947 ret = SMB_VFS_SYS_ACL_SET_FD(fsp, posix_acl);
3948
3949 done:
3950
3951 SMB_VFS_SYS_ACL_FREE_ACL(conn, posix_acl);
3952 return ret;
3953 }
3954
3955 /****************************************************************************
3956 Map from wire type to permset.
3957 ****************************************************************************/
3958
3959 static bool unix_ex_wire_to_permset(connection_struct *conn, unsigned char wire_perm, SMB_ACL_PERMSET_T *p_permset)
3960 {
3961 if (wire_perm & ~(SMB_POSIX_ACL_READ|SMB_POSIX_ACL_WRITE|SMB_POSIX_ACL_EXECUTE)) {
3962 return False;
3963 }
3964
3965 if (SMB_VFS_SYS_ACL_CLEAR_PERMS(conn, *p_permset) == -1) {
3966 return False;
3967 }
3968
3969 if (wire_perm & SMB_POSIX_ACL_READ) {
3970 if (SMB_VFS_SYS_ACL_ADD_PERM(conn, *p_permset, SMB_ACL_READ) == -1) {
3971 return False;
3972 }
3973 }
3974 if (wire_perm & SMB_POSIX_ACL_WRITE) {
3975 if (SMB_VFS_SYS_ACL_ADD_PERM(conn, *p_permset, SMB_ACL_WRITE) == -1) {
3976 return False;
3977 }
3978 }
3979 if (wire_perm & SMB_POSIX_ACL_EXECUTE) {
3980 if (SMB_VFS_SYS_ACL_ADD_PERM(conn, *p_permset, SMB_ACL_EXECUTE) == -1) {
3981 return False;
3982 }
3983 }
3984 return True;
3985 }
3986
3987 /****************************************************************************
3988 Map from wire type to tagtype.
3989 ****************************************************************************/
3990
3991 static bool unix_ex_wire_to_tagtype(unsigned char wire_tt, SMB_ACL_TAG_T *p_tt)
3992 {
3993 switch (wire_tt) {
3994 case SMB_POSIX_ACL_USER_OBJ:
3995 *p_tt = SMB_ACL_USER_OBJ;
3996 break;
3997 case SMB_POSIX_ACL_USER:
3998 *p_tt = SMB_ACL_USER;
3999 break;
4000 case SMB_POSIX_ACL_GROUP_OBJ:
4001 *p_tt = SMB_ACL_GROUP_OBJ;
4002 break;
4003 case SMB_POSIX_ACL_GROUP:
4004 *p_tt = SMB_ACL_GROUP;
4005 break;
4006 case SMB_POSIX_ACL_MASK:
4007 *p_tt = SMB_ACL_MASK;
4008 break;
4009 case SMB_POSIX_ACL_OTHER:
4010 *p_tt = SMB_ACL_OTHER;
4011 break;
4012 default:
4013 return False;
4014 }
4015 return True;
4016 }
4017
4018 /****************************************************************************
4019 Create a new POSIX acl from wire permissions.
4020 FIXME ! How does the share mask/mode fit into this.... ?
4021 ****************************************************************************/
4022
4023 static SMB_ACL_T create_posix_acl_from_wire(connection_struct *conn, uint16 num_acls, const char *pdata)
4024 {
4025 unsigned int i;
4026 SMB_ACL_T the_acl = SMB_VFS_SYS_ACL_INIT(conn, num_acls);
4027
4028 if (the_acl == NULL) {
4029 return NULL;
4030 }
4031
4032 for (i = 0; i < num_acls; i++) {
4033 SMB_ACL_ENTRY_T the_entry;
4034 SMB_ACL_PERMSET_T the_permset;
4035 SMB_ACL_TAG_T tag_type;
4036
4037 if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &the_acl, &the_entry) == -1) {
4038 DEBUG(0,("create_posix_acl_from_wire: Failed to create entry %u. (%s)\n",
4039 i, strerror(errno) ));
4040 goto fail;
4041 }
4042
4043 if (!unix_ex_wire_to_tagtype(CVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)), &tag_type)) {
4044 DEBUG(0,("create_posix_acl_from_wire: invalid wire tagtype %u on entry %u.\n",
4045 CVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)), i ));
4046 goto fail;
4047 }
4048
4049 if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, the_entry, tag_type) == -1) {
4050 DEBUG(0,("create_posix_acl_from_wire: Failed to set tagtype on entry %u. (%s)\n",
4051 i, strerror(errno) ));
4052 goto fail;
4053 }
4054
4055 /* Get the permset pointer from the new ACL entry. */
4056 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, the_entry, &the_permset) == -1) {
4057 DEBUG(0,("create_posix_acl_from_wire: Failed to get permset on entry %u. (%s)\n",
4058 i, strerror(errno) ));
4059 goto fail;
4060 }
4061
4062 /* Map from wire to permissions. */
4063 if (!unix_ex_wire_to_permset(conn, CVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)+1), &the_permset)) {
4064 DEBUG(0,("create_posix_acl_from_wire: invalid permset %u on entry %u.\n",
4065 CVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE) + 1), i ));
4066 goto fail;
4067 }
4068
4069 /* Now apply to the new ACL entry. */
4070 if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, the_entry, the_permset) == -1) {
4071 DEBUG(0,("create_posix_acl_from_wire: Failed to add permset on entry %u. (%s)\n",
4072 i, strerror(errno) ));
4073 goto fail;
4074 }
4075
4076 if (tag_type == SMB_ACL_USER) {
4077 uint32 uidval = IVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)+2);
4078 uid_t uid = (uid_t)uidval;
4079 if (SMB_VFS_SYS_ACL_SET_QUALIFIER(conn, the_entry,(void *)&uid) == -1) {
4080 DEBUG(0,("create_posix_acl_from_wire: Failed to set uid %u on entry %u. (%s)\n",
4081 (unsigned int)uid, i, strerror(errno) ));
4082 goto fail;
4083 }
4084 }
4085
4086 if (tag_type == SMB_ACL_GROUP) {
4087 uint32 gidval = IVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)+2);
4088 gid_t gid = (uid_t)gidval;
4089 if (SMB_VFS_SYS_ACL_SET_QUALIFIER(conn, the_entry,(void *)&gid) == -1) {
4090 DEBUG(0,("create_posix_acl_from_wire: Failed to set gid %u on entry %u. (%s)\n",
4091 (unsigned int)gid, i, strerror(errno) ));
4092 goto fail;
4093 }
4094 }
4095 }
4096
4097 return the_acl;
4098
4099 fail:
4100
4101 if (the_acl != NULL) {
4102 SMB_VFS_SYS_ACL_FREE_ACL(conn, the_acl);
4103 }
4104 return NULL;
4105 }
4106
4107 /****************************************************************************
4108 Calls from UNIX extensions - Default POSIX ACL set.
4109 If num_def_acls == 0 and not a directory just return. If it is a directory
4110 and num_def_acls == 0 then remove the default acl. Else set the default acl
4111 on the directory.
4112 ****************************************************************************/
4113
4114 bool set_unix_posix_default_acl(connection_struct *conn, const char *fname, SMB_STRUCT_STAT *psbuf,
4115 uint16 num_def_acls, const char *pdata)
4116 {
4117 SMB_ACL_T def_acl = NULL;
4118
4119 if (!S_ISDIR(psbuf->st_mode)) {
4120 if (num_def_acls) {
4121 DEBUG(5,("set_unix_posix_default_acl: Can't set default ACL on non-directory file %s\n", fname ));
4122 errno = EISDIR;
4123 return False;
4124 } else {
4125 return True;
4126 }
4127 }
4128
4129 if (!num_def_acls) {
4130 /* Remove the default ACL. */
4131 if (SMB_VFS_SYS_ACL_DELETE_DEF_FILE(conn, fname) == -1) {
4132 DEBUG(5,("set_unix_posix_default_acl: acl_delete_def_file failed on directory %s (%s)\n",
4133 fname, strerror(errno) ));
4134 return False;
4135 }
4136 return True;
4137 }
4138
4139 if ((def_acl = create_posix_acl_from_wire(conn, num_def_acls, pdata)) == NULL) {
4140 return False;
4141 }
4142
4143 if (SMB_VFS_SYS_ACL_SET_FILE(conn, fname, SMB_ACL_TYPE_DEFAULT, def_acl) == -1) {
4144 DEBUG(5,("set_unix_posix_default_acl: acl_set_file failed on directory %s (%s)\n",
4145 fname, strerror(errno) ));
4146 SMB_VFS_SYS_ACL_FREE_ACL(conn, def_acl);
4147 return False;
4148 }
4149
4150 DEBUG(10,("set_unix_posix_default_acl: set default acl for file %s\n", fname ));
4151 SMB_VFS_SYS_ACL_FREE_ACL(conn, def_acl);
4152 return True;
4153 }
4154
4155 /****************************************************************************
4156 Remove an ACL from a file. As we don't have acl_delete_entry() available
4157 we must read the current acl and copy all entries except MASK, USER and GROUP
4158 to a new acl, then set that. This (at least on Linux) causes any ACL to be
4159 removed.
4160 FIXME ! How does the share mask/mode fit into this.... ?
4161 ****************************************************************************/
4162
4163 static bool remove_posix_acl(connection_struct *conn, files_struct *fsp, const char *fname)
4164 {
4165 SMB_ACL_T file_acl = NULL;
4166 int entry_id = SMB_ACL_FIRST_ENTRY;
4167 SMB_ACL_ENTRY_T entry;
4168 bool ret = False;
4169 /* Create a new ACL with only 3 entries, u/g/w. */
4170 SMB_ACL_T new_file_acl = SMB_VFS_SYS_ACL_INIT(conn, 3);
4171 SMB_ACL_ENTRY_T user_ent = NULL;
4172 SMB_ACL_ENTRY_T group_ent = NULL;
4173 SMB_ACL_ENTRY_T other_ent = NULL;
4174
4175 if (new_file_acl == NULL) {
4176 DEBUG(5,("remove_posix_acl: failed to init new ACL with 3 entries for file %s.\n", fname));
4177 return False;
4178 }
4179
4180 /* Now create the u/g/w entries. */
4181 if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &new_file_acl, &user_ent) == -1) {
4182 DEBUG(5,("remove_posix_acl: Failed to create user entry for file %s. (%s)\n",
4183 fname, strerror(errno) ));
4184 goto done;
4185 }
4186 if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, user_ent, SMB_ACL_USER_OBJ) == -1) {
4187 DEBUG(5,("remove_posix_acl: Failed to set user entry for file %s. (%s)\n",
4188 fname, strerror(errno) ));
4189 goto done;
4190 }
4191
4192 if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &new_file_acl, &group_ent) == -1) {
4193 DEBUG(5,("remove_posix_acl: Failed to create group entry for file %s. (%s)\n",
4194 fname, strerror(errno) ));
4195 goto done;
4196 }
4197 if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, group_ent, SMB_ACL_GROUP_OBJ) == -1) {
4198 DEBUG(5,("remove_posix_acl: Failed to set group entry for file %s. (%s)\n",
4199 fname, strerror(errno) ));
4200 goto done;
4201 }
4202
4203 if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &new_file_acl, &other_ent) == -1) {
4204 DEBUG(5,("remove_posix_acl: Failed to create other entry for file %s. (%s)\n",
4205 fname, strerror(errno) ));
4206 goto done;
4207 }
4208 if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, other_ent, SMB_ACL_OTHER) == -1) {
4209 DEBUG(5,("remove_posix_acl: Failed to set other entry for file %s. (%s)\n",
4210 fname, strerror(errno) ));
4211 goto done;
4212 }
4213
4214 /* Get the current file ACL. */
4215 if (fsp && fsp->fh->fd != -1) {
4216 file_acl = SMB_VFS_SYS_ACL_GET_FD(fsp);
4217 } else {
4218 file_acl = SMB_VFS_SYS_ACL_GET_FILE( conn, fname, SMB_ACL_TYPE_ACCESS);
4219 }
4220
4221 if (file_acl == NULL) {
4222 /* This is only returned if an error occurred. Even for a file with
4223 no acl a u/g/w acl should be returned. */
4224 DEBUG(5,("remove_posix_acl: failed to get ACL from file %s (%s).\n",
4225 fname, strerror(errno) ));
4226 goto done;
4227 }
4228
4229 while ( SMB_VFS_SYS_ACL_GET_ENTRY(conn, file_acl, entry_id, &entry) == 1) {
4230 SMB_ACL_TAG_T tagtype;
4231 SMB_ACL_PERMSET_T permset;
4232
4233 entry_id = SMB_ACL_NEXT_ENTRY;
4234
4235 if (SMB_VFS_SYS_ACL_GET_TAG_TYPE(conn, entry, &tagtype) == -1) {
4236 DEBUG(5,("remove_posix_acl: failed to get tagtype from ACL on file %s (%s).\n",
4237 fname, strerror(errno) ));
4238 goto done;
4239 }
4240
4241 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, entry, &permset) == -1) {
4242 DEBUG(5,("remove_posix_acl: failed to get permset from ACL on file %s (%s).\n",
4243 fname, strerror(errno) ));
4244 goto done;
4245 }
4246
4247 if (tagtype == SMB_ACL_USER_OBJ) {
4248 if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, user_ent, permset) == -1) {
4249 DEBUG(5,("remove_posix_acl: failed to set permset from ACL on file %s (%s).\n",
4250 fname, strerror(errno) ));
4251 }
4252 } else if (tagtype == SMB_ACL_GROUP_OBJ) {
4253 if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, group_ent, permset) == -1) {
4254 DEBUG(5,("remove_posix_acl: failed to set permset from ACL on file %s (%s).\n",
4255 fname, strerror(errno) ));
4256 }
4257 } else if (tagtype == SMB_ACL_OTHER) {
4258 if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, other_ent, permset) == -1) {
4259 DEBUG(5,("remove_posix_acl: failed to set permset from ACL on file %s (%s).\n",
4260 fname, strerror(errno) ));
4261 }
4262 }
4263 }
4264
4265 /* Set the new empty file ACL. */
4266 if (fsp && fsp->fh->fd != -1) {
4267 if (SMB_VFS_SYS_ACL_SET_FD(fsp, new_file_acl) == -1) {
4268 DEBUG(5,("remove_posix_acl: acl_set_file failed on %s (%s)\n",
4269 fname, strerror(errno) ));
4270 goto done;
4271 }
4272 } else {
4273 if (SMB_VFS_SYS_ACL_SET_FILE(conn, fname, SMB_ACL_TYPE_ACCESS, new_file_acl) == -1) {
4274 DEBUG(5,("remove_posix_acl: acl_set_file failed on %s (%s)\n",
4275 fname, strerror(errno) ));
4276 goto done;
4277 }
4278 }
4279
4280 ret = True;
4281
4282 done:
4283
4284 if (file_acl) {
4285 SMB_VFS_SYS_ACL_FREE_ACL(conn, file_acl);
4286 }
4287 if (new_file_acl) {
4288 SMB_VFS_SYS_ACL_FREE_ACL(conn, new_file_acl);
4289 }
4290 return ret;
4291 }
4292
4293 /****************************************************************************
4294 Calls from UNIX extensions - POSIX ACL set.
4295 If num_def_acls == 0 then read/modify/write acl after removing all entries
4296 except SMB_ACL_USER_OBJ, SMB_ACL_GROUP_OBJ, SMB_ACL_OTHER.
4297 ****************************************************************************/
4298
4299 bool set_unix_posix_acl(connection_struct *conn, files_struct *fsp, const char *fname, uint16 num_acls, const char *pdata)
4300 {
4301 SMB_ACL_T file_acl = NULL;
4302
4303 if (!num_acls) {
4304 /* Remove the ACL from the file. */
4305 return remove_posix_acl(conn, fsp, fname);
4306 }
4307
4308 if ((file_acl = create_posix_acl_from_wire(conn, num_acls, pdata)) == NULL) {
4309 return False;
4310 }
4311
4312 if (fsp && fsp->fh->fd != -1) {
4313 /* The preferred way - use an open fd. */
4314 if (SMB_VFS_SYS_ACL_SET_FD(fsp, file_acl) == -1) {
4315 DEBUG(5,("set_unix_posix_acl: acl_set_file failed on %s (%s)\n",
4316 fname, strerror(errno) ));
4317 SMB_VFS_SYS_ACL_FREE_ACL(conn, file_acl);
4318 return False;
4319 }
4320 } else {
4321 if (SMB_VFS_SYS_ACL_SET_FILE(conn, fname, SMB_ACL_TYPE_ACCESS, file_acl) == -1) {
4322 DEBUG(5,("set_unix_posix_acl: acl_set_file failed on %s (%s)\n",
4323 fname, strerror(errno) ));
4324 SMB_VFS_SYS_ACL_FREE_ACL(conn, file_acl);
4325 return False;
4326 }
4327 }
4328
4329 DEBUG(10,("set_unix_posix_acl: set acl for file %s\n", fname ));
4330 SMB_VFS_SYS_ACL_FREE_ACL(conn, file_acl);
4331 return True;
4332 }
4333
4334 /********************************************************************
4335 Pull the NT ACL from a file on disk or the OpenEventlog() access
4336 check. Caller is responsible for freeing the returned security
4337 descriptor via TALLOC_FREE(). This is designed for dealing with
4338 user space access checks in smbd outside of the VFS. For example,
4339 checking access rights in OpenEventlog().
4340
4341 Assume we are dealing with files (for now)
4342 ********************************************************************/
4343
4344 SEC_DESC *get_nt_acl_no_snum( TALLOC_CTX *ctx, const char *fname)
4345 {
4346 SEC_DESC *psd, *ret_sd;
4347 connection_struct *conn;
4348 files_struct finfo;
4349 struct fd_handle fh;
4350
4351 conn = TALLOC_ZERO_P(ctx, connection_struct);
4352 if (conn == NULL) {
4353 DEBUG(0, ("talloc failed\n"));
4354 return NULL;
4355 }
4356
4357 if (!(conn->params = TALLOC_P(conn, struct share_params))) {
4358 DEBUG(0,("get_nt_acl_no_snum: talloc() failed!\n"));
4359 TALLOC_FREE(conn);
4360 return NULL;
4361 }
4362
4363 conn->params->service = -1;
4364
4365 set_conn_connectpath(conn, "/");
4366
4367 if (!smbd_vfs_init(conn)) {
4368 DEBUG(0,("get_nt_acl_no_snum: Unable to create a fake connection struct!\n"));
4369 conn_free_internal( conn );
4370 return NULL;
4371 }
4372
4373 ZERO_STRUCT( finfo );
4374 ZERO_STRUCT( fh );
4375
4376 finfo.fnum = -1;
4377 finfo.conn = conn;
4378 finfo.fh = &fh;
4379 finfo.fh->fd = -1;
4380 finfo.fsp_name = CONST_DISCARD(char *,fname);
4381
4382 if (!NT_STATUS_IS_OK(SMB_VFS_FGET_NT_ACL( &finfo, DACL_SECURITY_INFORMATION, &psd))) {
4383 DEBUG(0,("get_nt_acl_no_snum: get_nt_acl returned zero.\n"));
4384 conn_free_internal( conn );
4385 return NULL;
4386 }
4387
4388 ret_sd = dup_sec_desc( ctx, psd );
4389
4390 conn_free_internal( conn );
4391
4392 return ret_sd;
4393 }