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Avoid duplicate aces
[Samba.git] / source / smbd / posix_acls.c
blobe933c681a4ebb17704d67499a84238832787db9f
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 /* Assume that the current user is in the current group (force group) */
1121
1122 if (uid_ace->unix_ug.uid == current_user.ut.uid && group_ace->unix_ug.gid == current_user.ut.gid)
1123 return True;
1124
1125 /* u_name talloc'ed off tos. */
1126 u_name = uidtoname(uid_ace->unix_ug.uid);
1127 if (!u_name) {
1128 return False;
1129 }
1130 return user_in_group_sid(u_name, &group_ace->trustee);
1131 }
1132
1133 /****************************************************************************
1134 A well formed POSIX file or default ACL has at least 3 entries, a
1135 SMB_ACL_USER_OBJ, SMB_ACL_GROUP_OBJ, SMB_ACL_OTHER_OBJ.
1136 In addition, the owner must always have at least read access.
1137 When using this call on get_acl, the pst struct is valid and contains
1138 the mode of the file. When using this call on set_acl, the pst struct has
1139 been modified to have a mode containing the default for this file or directory
1140 type.
1141 ****************************************************************************/
1142
1143 static bool ensure_canon_entry_valid(canon_ace **pp_ace,
1144 const struct share_params *params,
1145 const bool is_directory,
1146 const DOM_SID *pfile_owner_sid,
1147 const DOM_SID *pfile_grp_sid,
1148 const SMB_STRUCT_STAT *pst,
1149 bool setting_acl)
1150 {
1151 canon_ace *pace;
1152 bool got_user = False;
1153 bool got_grp = False;
1154 bool got_other = False;
1155 canon_ace *pace_other = NULL;
1156
1157 for (pace = *pp_ace; pace; pace = pace->next) {
1158 if (pace->type == SMB_ACL_USER_OBJ) {
1159
1160 if (setting_acl)
1161 apply_default_perms(params, is_directory, pace, S_IRUSR);
1162 got_user = True;
1163
1164 } else if (pace->type == SMB_ACL_GROUP_OBJ) {
1165
1166 /*
1167 * Ensure create mask/force create mode is respected on set.
1168 */
1169
1170 if (setting_acl)
1171 apply_default_perms(params, is_directory, pace, S_IRGRP);
1172 got_grp = True;
1173
1174 } else if (pace->type == SMB_ACL_OTHER) {
1175
1176 /*
1177 * Ensure create mask/force create mode is respected on set.
1178 */
1179
1180 if (setting_acl)
1181 apply_default_perms(params, is_directory, pace, S_IROTH);
1182 got_other = True;
1183 pace_other = pace;
1184 }
1185 }
1186
1187 if (!got_user) {
1188 if ((pace = SMB_MALLOC_P(canon_ace)) == NULL) {
1189 DEBUG(0,("ensure_canon_entry_valid: malloc fail.\n"));
1190 return False;
1191 }
1192
1193 ZERO_STRUCTP(pace);
1194 pace->type = SMB_ACL_USER_OBJ;
1195 pace->owner_type = UID_ACE;
1196 pace->unix_ug.uid = pst->st_uid;
1197 pace->trustee = *pfile_owner_sid;
1198 pace->attr = ALLOW_ACE;
1199
1200 if (setting_acl) {
1201 /* See if the owning user is in any of the other groups in
1202 the ACE. If so, OR in the permissions from that group. */
1203
1204 bool group_matched = False;
1205 canon_ace *pace_iter;
1206
1207 for (pace_iter = *pp_ace; pace_iter; pace_iter = pace_iter->next) {
1208 if (pace_iter->type == SMB_ACL_GROUP_OBJ || pace_iter->type == SMB_ACL_GROUP) {
1209 if (uid_entry_in_group(pace, pace_iter)) {
1210 pace->perms |= pace_iter->perms;
1211 group_matched = True;
1212 }
1213 }
1214 }
1215
1216 /* If we only got an "everyone" perm, just use that. */
1217 if (!group_matched) {
1218 if (got_other)
1219 pace->perms = pace_other->perms;
1220 else
1221 pace->perms = 0;
1222 }
1223
1224 apply_default_perms(params, is_directory, pace, S_IRUSR);
1225 } else {
1226 pace->perms = unix_perms_to_acl_perms(pst->st_mode, S_IRUSR, S_IWUSR, S_IXUSR);
1227 }
1228
1229 DLIST_ADD(*pp_ace, pace);
1230 }
1231
1232 if (!got_grp) {
1233 if ((pace = SMB_MALLOC_P(canon_ace)) == NULL) {
1234 DEBUG(0,("ensure_canon_entry_valid: malloc fail.\n"));
1235 return False;
1236 }
1237
1238 ZERO_STRUCTP(pace);
1239 pace->type = SMB_ACL_GROUP_OBJ;
1240 pace->owner_type = GID_ACE;
1241 pace->unix_ug.uid = pst->st_gid;
1242 pace->trustee = *pfile_grp_sid;
1243 pace->attr = ALLOW_ACE;
1244 if (setting_acl) {
1245 /* If we only got an "everyone" perm, just use that. */
1246 if (got_other)
1247 pace->perms = pace_other->perms;
1248 else
1249 pace->perms = 0;
1250 apply_default_perms(params, is_directory, pace, S_IRGRP);
1251 } else {
1252 pace->perms = unix_perms_to_acl_perms(pst->st_mode, S_IRGRP, S_IWGRP, S_IXGRP);
1253 }
1254
1255 DLIST_ADD(*pp_ace, pace);
1256 }
1257
1258 if (!got_other) {
1259 if ((pace = SMB_MALLOC_P(canon_ace)) == NULL) {
1260 DEBUG(0,("ensure_canon_entry_valid: malloc fail.\n"));
1261 return False;
1262 }
1263
1264 ZERO_STRUCTP(pace);
1265 pace->type = SMB_ACL_OTHER;
1266 pace->owner_type = WORLD_ACE;
1267 pace->unix_ug.world = -1;
1268 pace->trustee = global_sid_World;
1269 pace->attr = ALLOW_ACE;
1270 if (setting_acl) {
1271 pace->perms = 0;
1272 apply_default_perms(params, is_directory, pace, S_IROTH);
1273 } else
1274 pace->perms = unix_perms_to_acl_perms(pst->st_mode, S_IROTH, S_IWOTH, S_IXOTH);
1275
1276 DLIST_ADD(*pp_ace, pace);
1277 }
1278
1279 return True;
1280 }
1281
1282 /****************************************************************************
1283 Check if a POSIX ACL has the required SMB_ACL_USER_OBJ and SMB_ACL_GROUP_OBJ entries.
1284 If it does not have them, check if there are any entries where the trustee is the
1285 file owner or the owning group, and map these to SMB_ACL_USER_OBJ and SMB_ACL_GROUP_OBJ.
1286 ****************************************************************************/
1287
1288 static void check_owning_objs(canon_ace *ace, DOM_SID *pfile_owner_sid, DOM_SID *pfile_grp_sid)
1289 {
1290 bool got_user_obj, got_group_obj;
1291 canon_ace *current_ace;
1292 int i, entries;
1293
1294 entries = count_canon_ace_list(ace);
1295 got_user_obj = False;
1296 got_group_obj = False;
1297
1298 for (i=0, current_ace = ace; i < entries; i++, current_ace = current_ace->next) {
1299 if (current_ace->type == SMB_ACL_USER_OBJ)
1300 got_user_obj = True;
1301 else if (current_ace->type == SMB_ACL_GROUP_OBJ)
1302 got_group_obj = True;
1303 }
1304 if (got_user_obj && got_group_obj) {
1305 DEBUG(10,("check_owning_objs: ACL had owning user/group entries.\n"));
1306 return;
1307 }
1308
1309 for (i=0, current_ace = ace; i < entries; i++, current_ace = current_ace->next) {
1310 if (!got_user_obj && current_ace->owner_type == UID_ACE &&
1311 sid_equal(&current_ace->trustee, pfile_owner_sid)) {
1312 current_ace->type = SMB_ACL_USER_OBJ;
1313 got_user_obj = True;
1314 }
1315 if (!got_group_obj && current_ace->owner_type == GID_ACE &&
1316 sid_equal(&current_ace->trustee, pfile_grp_sid)) {
1317 current_ace->type = SMB_ACL_GROUP_OBJ;
1318 got_group_obj = True;
1319 }
1320 }
1321 if (!got_user_obj)
1322 DEBUG(10,("check_owning_objs: ACL is missing an owner entry.\n"));
1323 if (!got_group_obj)
1324 DEBUG(10,("check_owning_objs: ACL is missing an owning group entry.\n"));
1325 }
1326
1327 /****************************************************************************
1328 Unpack a SEC_DESC into two canonical ace lists.
1329 ****************************************************************************/
1330
1331 static bool create_canon_ace_lists(files_struct *fsp,
1332 SMB_STRUCT_STAT *pst,
1333 DOM_SID *pfile_owner_sid,
1334 DOM_SID *pfile_grp_sid,
1335 canon_ace **ppfile_ace,
1336 canon_ace **ppdir_ace,
1337 const SEC_ACL *dacl)
1338 {
1339 bool all_aces_are_inherit_only = (fsp->is_directory ? True : False);
1340 canon_ace *file_ace = NULL;
1341 canon_ace *dir_ace = NULL;
1342 canon_ace *current_ace = NULL;
1343 bool got_dir_allow = False;
1344 bool got_file_allow = False;
1345 int i, j;
1346
1347 *ppfile_ace = NULL;
1348 *ppdir_ace = NULL;
1349
1350 /*
1351 * Convert the incoming ACL into a more regular form.
1352 */
1353
1354 for(i = 0; i < dacl->num_aces; i++) {
1355 SEC_ACE *psa = &dacl->aces[i];
1356
1357 if((psa->type != SEC_ACE_TYPE_ACCESS_ALLOWED) && (psa->type != SEC_ACE_TYPE_ACCESS_DENIED)) {
1358 DEBUG(3,("create_canon_ace_lists: unable to set anything but an ALLOW or DENY ACE.\n"));
1359 return False;
1360 }
1361
1362 if (nt4_compatible_acls()) {
1363 /*
1364 * The security mask may be UNIX_ACCESS_NONE which should map into
1365 * no permissions (we overload the WRITE_OWNER bit for this) or it
1366 * should be one of the ALL/EXECUTE/READ/WRITE bits. Arrange for this
1367 * to be so. Any other bits override the UNIX_ACCESS_NONE bit.
1368 */
1369
1370 /*
1371 * Convert GENERIC bits to specific bits.
1372 */
1373
1374 se_map_generic(&psa->access_mask, &file_generic_mapping);
1375
1376 psa->access_mask &= (UNIX_ACCESS_NONE|FILE_ALL_ACCESS);
1377
1378 if(psa->access_mask != UNIX_ACCESS_NONE)
1379 psa->access_mask &= ~UNIX_ACCESS_NONE;
1380 }
1381 }
1382
1383 /*
1384 * Deal with the fact that NT 4.x re-writes the canonical format
1385 * that we return for default ACLs. If a directory ACE is identical
1386 * to a inherited directory ACE then NT changes the bits so that the
1387 * first ACE is set to OI|IO and the second ACE for this SID is set
1388 * to CI. We need to repair this. JRA.
1389 */
1390
1391 for(i = 0; i < dacl->num_aces; i++) {
1392 SEC_ACE *psa1 = &dacl->aces[i];
1393
1394 for (j = i + 1; j < dacl->num_aces; j++) {
1395 SEC_ACE *psa2 = &dacl->aces[j];
1396
1397 if (psa1->access_mask != psa2->access_mask)
1398 continue;
1399
1400 if (!sid_equal(&psa1->trustee, &psa2->trustee))
1401 continue;
1402
1403 /*
1404 * Ok - permission bits and SIDs are equal.
1405 * Check if flags were re-written.
1406 */
1407
1408 if (psa1->flags & SEC_ACE_FLAG_INHERIT_ONLY) {
1409
1410 psa1->flags |= (psa2->flags & (SEC_ACE_FLAG_CONTAINER_INHERIT|SEC_ACE_FLAG_OBJECT_INHERIT));
1411 psa2->flags &= ~(SEC_ACE_FLAG_CONTAINER_INHERIT|SEC_ACE_FLAG_OBJECT_INHERIT);
1412
1413 } else if (psa2->flags & SEC_ACE_FLAG_INHERIT_ONLY) {
1414
1415 psa2->flags |= (psa1->flags & (SEC_ACE_FLAG_CONTAINER_INHERIT|SEC_ACE_FLAG_OBJECT_INHERIT));
1416 psa1->flags &= ~(SEC_ACE_FLAG_CONTAINER_INHERIT|SEC_ACE_FLAG_OBJECT_INHERIT);
1417
1418 }
1419 }
1420 }
1421
1422 for(i = 0; i < dacl->num_aces; i++) {
1423 SEC_ACE *psa = &dacl->aces[i];
1424
1425 /*
1426 * Create a cannon_ace entry representing this NT DACL ACE.
1427 */
1428
1429 if ((current_ace = SMB_MALLOC_P(canon_ace)) == NULL) {
1430 free_canon_ace_list(file_ace);
1431 free_canon_ace_list(dir_ace);
1432 DEBUG(0,("create_canon_ace_lists: malloc fail.\n"));
1433 return False;
1434 }
1435
1436 ZERO_STRUCTP(current_ace);
1437
1438 sid_copy(&current_ace->trustee, &psa->trustee);
1439
1440 /*
1441 * Try and work out if the SID is a user or group
1442 * as we need to flag these differently for POSIX.
1443 * Note what kind of a POSIX ACL this should map to.
1444 */
1445
1446 if( sid_equal(&current_ace->trustee, &global_sid_World)) {
1447 current_ace->owner_type = WORLD_ACE;
1448 current_ace->unix_ug.world = -1;
1449 current_ace->type = SMB_ACL_OTHER;
1450 } else if (sid_equal(&current_ace->trustee, &global_sid_Creator_Owner)) {
1451 current_ace->owner_type = UID_ACE;
1452 current_ace->unix_ug.uid = pst->st_uid;
1453 current_ace->type = SMB_ACL_USER_OBJ;
1454
1455 /*
1456 * The Creator Owner entry only specifies inheritable permissions,
1457 * never access permissions. WinNT doesn't always set the ACE to
1458 *INHERIT_ONLY, though.
1459 */
1460
1461 if (nt4_compatible_acls())
1462 psa->flags |= SEC_ACE_FLAG_INHERIT_ONLY;
1463 } else if (sid_equal(&current_ace->trustee, &global_sid_Creator_Group)) {
1464 current_ace->owner_type = GID_ACE;
1465 current_ace->unix_ug.gid = pst->st_gid;
1466 current_ace->type = SMB_ACL_GROUP_OBJ;
1467
1468 /*
1469 * The Creator Group entry only specifies inheritable permissions,
1470 * never access permissions. WinNT doesn't always set the ACE to
1471 *INHERIT_ONLY, though.
1472 */
1473 if (nt4_compatible_acls())
1474 psa->flags |= SEC_ACE_FLAG_INHERIT_ONLY;
1475
1476 } else if (sid_to_uid( &current_ace->trustee, &current_ace->unix_ug.uid)) {
1477 current_ace->owner_type = UID_ACE;
1478 /* If it's the owning user, this is a user_obj, not
1479 * a user. */
1480 if (current_ace->unix_ug.uid == pst->st_uid) {
1481 current_ace->type = SMB_ACL_USER_OBJ;
1482 } else {
1483 current_ace->type = SMB_ACL_USER;
1484 }
1485 } else if (sid_to_gid( &current_ace->trustee, &current_ace->unix_ug.gid)) {
1486 current_ace->owner_type = GID_ACE;
1487 /* If it's the primary group, this is a group_obj, not
1488 * a group. */
1489 if (current_ace->unix_ug.gid == pst->st_gid) {
1490 current_ace->type = SMB_ACL_GROUP_OBJ;
1491 } else {
1492 current_ace->type = SMB_ACL_GROUP;
1493 }
1494 } else {
1495 /*
1496 * Silently ignore map failures in non-mappable SIDs (NT Authority, BUILTIN etc).
1497 */
1498
1499 if (non_mappable_sid(&psa->trustee)) {
1500 DEBUG(10, ("create_canon_ace_lists: ignoring "
1501 "non-mappable SID %s\n",
1502 sid_string_dbg(&psa->trustee)));
1503 SAFE_FREE(current_ace);
1504 continue;
1505 }
1506
1507 free_canon_ace_list(file_ace);
1508 free_canon_ace_list(dir_ace);
1509 DEBUG(0, ("create_canon_ace_lists: unable to map SID "
1510 "%s to uid or gid.\n",
1511 sid_string_dbg(&current_ace->trustee)));
1512 SAFE_FREE(current_ace);
1513 return False;
1514 }
1515
1516 /*
1517 * Map the given NT permissions into a UNIX mode_t containing only
1518 * S_I(R|W|X)USR bits.
1519 */
1520
1521 current_ace->perms |= map_nt_perms( &psa->access_mask, S_IRUSR);
1522 current_ace->attr = (psa->type == SEC_ACE_TYPE_ACCESS_ALLOWED) ? ALLOW_ACE : DENY_ACE;
1523 current_ace->inherited = ((psa->flags & SEC_ACE_FLAG_INHERITED_ACE) ? True : False);
1524
1525 /*
1526 * Now add the created ace to either the file list, the directory
1527 * list, or both. We *MUST* preserve the order here (hence we use
1528 * DLIST_ADD_END) as NT ACLs are order dependent.
1529 */
1530
1531 if (fsp->is_directory) {
1532
1533 /*
1534 * We can only add to the default POSIX ACE list if the ACE is
1535 * designed to be inherited by both files and directories.
1536 */
1537
1538 if ((psa->flags & (SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT)) ==
1539 (SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT)) {
1540
1541 DLIST_ADD_END(dir_ace, current_ace, canon_ace *);
1542
1543 /*
1544 * Note if this was an allow ace. We can't process
1545 * any further deny ace's after this.
1546 */
1547
1548 if (current_ace->attr == ALLOW_ACE)
1549 got_dir_allow = True;
1550
1551 if ((current_ace->attr == DENY_ACE) && got_dir_allow) {
1552 DEBUG(0,("create_canon_ace_lists: malformed ACL in inheritable ACL ! \
1553 Deny entry after Allow entry. Failing to set on file %s.\n", fsp->fsp_name ));
1554 free_canon_ace_list(file_ace);
1555 free_canon_ace_list(dir_ace);
1556 return False;
1557 }
1558
1559 if( DEBUGLVL( 10 )) {
1560 dbgtext("create_canon_ace_lists: adding dir ACL:\n");
1561 print_canon_ace( current_ace, 0);
1562 }
1563
1564 /*
1565 * If this is not an inherit only ACE we need to add a duplicate
1566 * to the file acl.
1567 */
1568
1569 if (!(psa->flags & SEC_ACE_FLAG_INHERIT_ONLY)) {
1570 canon_ace *dup_ace = dup_canon_ace(current_ace);
1571
1572 if (!dup_ace) {
1573 DEBUG(0,("create_canon_ace_lists: malloc fail !\n"));
1574 free_canon_ace_list(file_ace);
1575 free_canon_ace_list(dir_ace);
1576 return False;
1577 }
1578
1579 /*
1580 * We must not free current_ace here as its
1581 * pointer is now owned by the dir_ace list.
1582 */
1583 current_ace = dup_ace;
1584 } else {
1585 /*
1586 * We must not free current_ace here as its
1587 * pointer is now owned by the dir_ace list.
1588 */
1589 current_ace = NULL;
1590 }
1591 }
1592 }
1593
1594 /*
1595 * Only add to the file ACL if not inherit only.
1596 */
1597
1598 if (current_ace && !(psa->flags & SEC_ACE_FLAG_INHERIT_ONLY)) {
1599 DLIST_ADD_END(file_ace, current_ace, canon_ace *);
1600
1601 /*
1602 * Note if this was an allow ace. We can't process
1603 * any further deny ace's after this.
1604 */
1605
1606 if (current_ace->attr == ALLOW_ACE)
1607 got_file_allow = True;
1608
1609 if ((current_ace->attr == DENY_ACE) && got_file_allow) {
1610 DEBUG(0,("create_canon_ace_lists: malformed ACL in file ACL ! \
1611 Deny entry after Allow entry. Failing to set on file %s.\n", fsp->fsp_name ));
1612 free_canon_ace_list(file_ace);
1613 free_canon_ace_list(dir_ace);
1614 return False;
1615 }
1616
1617 if( DEBUGLVL( 10 )) {
1618 dbgtext("create_canon_ace_lists: adding file ACL:\n");
1619 print_canon_ace( current_ace, 0);
1620 }
1621 all_aces_are_inherit_only = False;
1622 /*
1623 * We must not free current_ace here as its
1624 * pointer is now owned by the file_ace list.
1625 */
1626 current_ace = NULL;
1627 }
1628
1629 /*
1630 * Free if ACE was not added.
1631 */
1632
1633 SAFE_FREE(current_ace);
1634 }
1635
1636 if (fsp->is_directory && all_aces_are_inherit_only) {
1637 /*
1638 * Windows 2000 is doing one of these weird 'inherit acl'
1639 * traverses to conserve NTFS ACL resources. Just pretend
1640 * there was no DACL sent. JRA.
1641 */
1642
1643 DEBUG(10,("create_canon_ace_lists: Win2k inherit acl traverse. Ignoring DACL.\n"));
1644 free_canon_ace_list(file_ace);
1645 free_canon_ace_list(dir_ace);
1646 file_ace = NULL;
1647 dir_ace = NULL;
1648 } else {
1649 /*
1650 * Check if we have SMB_ACL_USER_OBJ and SMB_ACL_GROUP_OBJ entries in each
1651 * ACL. If we don't have them, check if any SMB_ACL_USER/SMB_ACL_GROUP
1652 * entries can be converted to *_OBJ. Usually we will already have these
1653 * entries in the Default ACL, and the Access ACL will not have them.
1654 */
1655 if (file_ace) {
1656 check_owning_objs(file_ace, pfile_owner_sid, pfile_grp_sid);
1657 }
1658 if (dir_ace) {
1659 check_owning_objs(dir_ace, pfile_owner_sid, pfile_grp_sid);
1660 }
1661 }
1662
1663 *ppfile_ace = file_ace;
1664 *ppdir_ace = dir_ace;
1665
1666 return True;
1667 }
1668
1669 /****************************************************************************
1670 ASCII art time again... JRA :-).
1671
1672 We have 4 cases to process when moving from an NT ACL to a POSIX ACL. Firstly,
1673 we insist the ACL is in canonical form (ie. all DENY entries preceede ALLOW
1674 entries). Secondly, the merge code has ensured that all duplicate SID entries for
1675 allow or deny have been merged, so the same SID can only appear once in the deny
1676 list or once in the allow list.
1677
1678 We then process as follows :
1679
1680 ---------------------------------------------------------------------------
1681 First pass - look for a Everyone DENY entry.
1682
1683 If it is deny all (rwx) trunate the list at this point.
1684 Else, walk the list from this point and use the deny permissions of this
1685 entry as a mask on all following allow entries. Finally, delete
1686 the Everyone DENY entry (we have applied it to everything possible).
1687
1688 In addition, in this pass we remove any DENY entries that have
1689 no permissions (ie. they are a DENY nothing).
1690 ---------------------------------------------------------------------------
1691 Second pass - only deal with deny user entries.
1692
1693 DENY user1 (perms XXX)
1694
1695 new_perms = 0
1696 for all following allow group entries where user1 is in group
1697 new_perms |= group_perms;
1698
1699 user1 entry perms = new_perms & ~ XXX;
1700
1701 Convert the deny entry to an allow entry with the new perms and
1702 push to the end of the list. Note if the user was in no groups
1703 this maps to a specific allow nothing entry for this user.
1704
1705 The common case from the NT ACL choser (userX deny all) is
1706 optimised so we don't do the group lookup - we just map to
1707 an allow nothing entry.
1708
1709 What we're doing here is inferring the allow permissions the
1710 person setting the ACE on user1 wanted by looking at the allow
1711 permissions on the groups the user is currently in. This will
1712 be a snapshot, depending on group membership but is the best
1713 we can do and has the advantage of failing closed rather than
1714 open.
1715 ---------------------------------------------------------------------------
1716 Third pass - only deal with deny group entries.
1717
1718 DENY group1 (perms XXX)
1719
1720 for all following allow user entries where user is in group1
1721 user entry perms = user entry perms & ~ XXX;
1722
1723 If there is a group Everyone allow entry with permissions YYY,
1724 convert the group1 entry to an allow entry and modify its
1725 permissions to be :
1726
1727 new_perms = YYY & ~ XXX
1728
1729 and push to the end of the list.
1730
1731 If there is no group Everyone allow entry then convert the
1732 group1 entry to a allow nothing entry and push to the end of the list.
1733
1734 Note that the common case from the NT ACL choser (groupX deny all)
1735 cannot be optimised here as we need to modify user entries who are
1736 in the group to change them to a deny all also.
1737
1738 What we're doing here is modifying the allow permissions of
1739 user entries (which are more specific in POSIX ACLs) to mask
1740 out the explicit deny set on the group they are in. This will
1741 be a snapshot depending on current group membership but is the
1742 best we can do and has the advantage of failing closed rather
1743 than open.
1744 ---------------------------------------------------------------------------
1745 Fourth pass - cope with cumulative permissions.
1746
1747 for all allow user entries, if there exists an allow group entry with
1748 more permissive permissions, and the user is in that group, rewrite the
1749 allow user permissions to contain both sets of permissions.
1750
1751 Currently the code for this is #ifdef'ed out as these semantics make
1752 no sense to me. JRA.
1753 ---------------------------------------------------------------------------
1754
1755 Note we *MUST* do the deny user pass first as this will convert deny user
1756 entries into allow user entries which can then be processed by the deny
1757 group pass.
1758
1759 The above algorithm took a *lot* of thinking about - hence this
1760 explaination :-). JRA.
1761 ****************************************************************************/
1762
1763 /****************************************************************************
1764 Process a canon_ace list entries. This is very complex code. We need
1765 to go through and remove the "deny" permissions from any allow entry that matches
1766 the id of this entry. We have already refused any NT ACL that wasn't in correct
1767 order (DENY followed by ALLOW). If any allow entry ends up with zero permissions,
1768 we just remove it (to fail safe). We have already removed any duplicate ace
1769 entries. Treat an "Everyone" DENY_ACE as a special case - use it to mask all
1770 allow entries.
1771 ****************************************************************************/
1772
1773 static void process_deny_list( canon_ace **pp_ace_list )
1774 {
1775 canon_ace *ace_list = *pp_ace_list;
1776 canon_ace *curr_ace = NULL;
1777 canon_ace *curr_ace_next = NULL;
1778
1779 /* Pass 1 above - look for an Everyone, deny entry. */
1780
1781 for (curr_ace = ace_list; curr_ace; curr_ace = curr_ace_next) {
1782 canon_ace *allow_ace_p;
1783
1784 curr_ace_next = curr_ace->next; /* So we can't lose the link. */
1785
1786 if (curr_ace->attr != DENY_ACE)
1787 continue;
1788
1789 if (curr_ace->perms == (mode_t)0) {
1790
1791 /* Deny nothing entry - delete. */
1792
1793 DLIST_REMOVE(ace_list, curr_ace);
1794 continue;
1795 }
1796
1797 if (!sid_equal(&curr_ace->trustee, &global_sid_World))
1798 continue;
1799
1800 /* JRATEST - assert. */
1801 SMB_ASSERT(curr_ace->owner_type == WORLD_ACE);
1802
1803 if (curr_ace->perms == ALL_ACE_PERMS) {
1804
1805 /*
1806 * Optimisation. This is a DENY_ALL to Everyone. Truncate the
1807 * list at this point including this entry.
1808 */
1809
1810 canon_ace *prev_entry = curr_ace->prev;
1811
1812 free_canon_ace_list( curr_ace );
1813 if (prev_entry)
1814 prev_entry->next = NULL;
1815 else {
1816 /* We deleted the entire list. */
1817 ace_list = NULL;
1818 }
1819 break;
1820 }
1821
1822 for (allow_ace_p = curr_ace->next; allow_ace_p; allow_ace_p = allow_ace_p->next) {
1823
1824 /*
1825 * Only mask off allow entries.
1826 */
1827
1828 if (allow_ace_p->attr != ALLOW_ACE)
1829 continue;
1830
1831 allow_ace_p->perms &= ~curr_ace->perms;
1832 }
1833
1834 /*
1835 * Now it's been applied, remove it.
1836 */
1837
1838 DLIST_REMOVE(ace_list, curr_ace);
1839 }
1840
1841 /* Pass 2 above - deal with deny user entries. */
1842
1843 for (curr_ace = ace_list; curr_ace; curr_ace = curr_ace_next) {
1844 mode_t new_perms = (mode_t)0;
1845 canon_ace *allow_ace_p;
1846
1847 curr_ace_next = curr_ace->next; /* So we can't lose the link. */
1848
1849 if (curr_ace->attr != DENY_ACE)
1850 continue;
1851
1852 if (curr_ace->owner_type != UID_ACE)
1853 continue;
1854
1855 if (curr_ace->perms == ALL_ACE_PERMS) {
1856
1857 /*
1858 * Optimisation - this is a deny everything to this user.
1859 * Convert to an allow nothing and push to the end of the list.
1860 */
1861
1862 curr_ace->attr = ALLOW_ACE;
1863 curr_ace->perms = (mode_t)0;
1864 DLIST_DEMOTE(ace_list, curr_ace, canon_ace *);
1865 continue;
1866 }
1867
1868 for (allow_ace_p = curr_ace->next; allow_ace_p; allow_ace_p = allow_ace_p->next) {
1869
1870 if (allow_ace_p->attr != ALLOW_ACE)
1871 continue;
1872
1873 /* We process GID_ACE and WORLD_ACE entries only. */
1874
1875 if (allow_ace_p->owner_type == UID_ACE)
1876 continue;
1877
1878 if (uid_entry_in_group( curr_ace, allow_ace_p))
1879 new_perms |= allow_ace_p->perms;
1880 }
1881
1882 /*
1883 * Convert to a allow entry, modify the perms and push to the end
1884 * of the list.
1885 */
1886
1887 curr_ace->attr = ALLOW_ACE;
1888 curr_ace->perms = (new_perms & ~curr_ace->perms);
1889 DLIST_DEMOTE(ace_list, curr_ace, canon_ace *);
1890 }
1891
1892 /* Pass 3 above - deal with deny group entries. */
1893
1894 for (curr_ace = ace_list; curr_ace; curr_ace = curr_ace_next) {
1895 canon_ace *allow_ace_p;
1896 canon_ace *allow_everyone_p = NULL;
1897
1898 curr_ace_next = curr_ace->next; /* So we can't lose the link. */
1899
1900 if (curr_ace->attr != DENY_ACE)
1901 continue;
1902
1903 if (curr_ace->owner_type != GID_ACE)
1904 continue;
1905
1906 for (allow_ace_p = curr_ace->next; allow_ace_p; allow_ace_p = allow_ace_p->next) {
1907
1908 if (allow_ace_p->attr != ALLOW_ACE)
1909 continue;
1910
1911 /* Store a pointer to the Everyone allow, if it exists. */
1912 if (allow_ace_p->owner_type == WORLD_ACE)
1913 allow_everyone_p = allow_ace_p;
1914
1915 /* We process UID_ACE entries only. */
1916
1917 if (allow_ace_p->owner_type != UID_ACE)
1918 continue;
1919
1920 /* Mask off the deny group perms. */
1921
1922 if (uid_entry_in_group( allow_ace_p, curr_ace))
1923 allow_ace_p->perms &= ~curr_ace->perms;
1924 }
1925
1926 /*
1927 * Convert the deny to an allow with the correct perms and
1928 * push to the end of the list.
1929 */
1930
1931 curr_ace->attr = ALLOW_ACE;
1932 if (allow_everyone_p)
1933 curr_ace->perms = allow_everyone_p->perms & ~curr_ace->perms;
1934 else
1935 curr_ace->perms = (mode_t)0;
1936 DLIST_DEMOTE(ace_list, curr_ace, canon_ace *);
1937 }
1938
1939 /* Doing this fourth pass allows Windows semantics to be layered
1940 * on top of POSIX semantics. I'm not sure if this is desirable.
1941 * For example, in W2K ACLs there is no way to say, "Group X no
1942 * access, user Y full access" if user Y is a member of group X.
1943 * This seems completely broken semantics to me.... JRA.
1944 */
1945
1946 #if 0
1947 /* Pass 4 above - deal with allow entries. */
1948
1949 for (curr_ace = ace_list; curr_ace; curr_ace = curr_ace_next) {
1950 canon_ace *allow_ace_p;
1951
1952 curr_ace_next = curr_ace->next; /* So we can't lose the link. */
1953
1954 if (curr_ace->attr != ALLOW_ACE)
1955 continue;
1956
1957 if (curr_ace->owner_type != UID_ACE)
1958 continue;
1959
1960 for (allow_ace_p = ace_list; allow_ace_p; allow_ace_p = allow_ace_p->next) {
1961
1962 if (allow_ace_p->attr != ALLOW_ACE)
1963 continue;
1964
1965 /* We process GID_ACE entries only. */
1966
1967 if (allow_ace_p->owner_type != GID_ACE)
1968 continue;
1969
1970 /* OR in the group perms. */
1971
1972 if (uid_entry_in_group( curr_ace, allow_ace_p))
1973 curr_ace->perms |= allow_ace_p->perms;
1974 }
1975 }
1976 #endif
1977
1978 *pp_ace_list = ace_list;
1979 }
1980
1981 /****************************************************************************
1982 Create a default mode that will be used if a security descriptor entry has
1983 no user/group/world entries.
1984 ****************************************************************************/
1985
1986 static mode_t create_default_mode(files_struct *fsp, bool interitable_mode)
1987 {
1988 int snum = SNUM(fsp->conn);
1989 mode_t and_bits = (mode_t)0;
1990 mode_t or_bits = (mode_t)0;
1991 mode_t mode = interitable_mode
1992 ? unix_mode( fsp->conn, FILE_ATTRIBUTE_ARCHIVE, fsp->fsp_name,
1993 NULL )
1994 : S_IRUSR;
1995
1996 if (fsp->is_directory)
1997 mode |= (S_IWUSR|S_IXUSR);
1998
1999 /*
2000 * Now AND with the create mode/directory mode bits then OR with the
2001 * force create mode/force directory mode bits.
2002 */
2003
2004 if (fsp->is_directory) {
2005 and_bits = lp_dir_security_mask(snum);
2006 or_bits = lp_force_dir_security_mode(snum);
2007 } else {
2008 and_bits = lp_security_mask(snum);
2009 or_bits = lp_force_security_mode(snum);
2010 }
2011
2012 return ((mode & and_bits)|or_bits);
2013 }
2014
2015 /****************************************************************************
2016 Unpack a SEC_DESC into two canonical ace lists. We don't depend on this
2017 succeeding.
2018 ****************************************************************************/
2019
2020 static bool unpack_canon_ace(files_struct *fsp,
2021 SMB_STRUCT_STAT *pst,
2022 DOM_SID *pfile_owner_sid,
2023 DOM_SID *pfile_grp_sid,
2024 canon_ace **ppfile_ace,
2025 canon_ace **ppdir_ace,
2026 uint32 security_info_sent,
2027 const SEC_DESC *psd)
2028 {
2029 canon_ace *file_ace = NULL;
2030 canon_ace *dir_ace = NULL;
2031
2032 *ppfile_ace = NULL;
2033 *ppdir_ace = NULL;
2034
2035 if(security_info_sent == 0) {
2036 DEBUG(0,("unpack_canon_ace: no security info sent !\n"));
2037 return False;
2038 }
2039
2040 /*
2041 * If no DACL then this is a chown only security descriptor.
2042 */
2043
2044 if(!(security_info_sent & DACL_SECURITY_INFORMATION) || !psd->dacl)
2045 return True;
2046
2047 /*
2048 * Now go through the DACL and create the canon_ace lists.
2049 */
2050
2051 if (!create_canon_ace_lists( fsp, pst, pfile_owner_sid, pfile_grp_sid,
2052 &file_ace, &dir_ace, psd->dacl))
2053 return False;
2054
2055 if ((file_ace == NULL) && (dir_ace == NULL)) {
2056 /* W2K traverse DACL set - ignore. */
2057 return True;
2058 }
2059
2060 /*
2061 * Go through the canon_ace list and merge entries
2062 * belonging to identical users of identical allow or deny type.
2063 * We can do this as all deny entries come first, followed by
2064 * all allow entries (we have mandated this before accepting this acl).
2065 */
2066
2067 print_canon_ace_list( "file ace - before merge", file_ace);
2068 merge_aces( &file_ace );
2069
2070 print_canon_ace_list( "dir ace - before merge", dir_ace);
2071 merge_aces( &dir_ace );
2072
2073 /*
2074 * NT ACLs are order dependent. Go through the acl lists and
2075 * process DENY entries by masking the allow entries.
2076 */
2077
2078 print_canon_ace_list( "file ace - before deny", file_ace);
2079 process_deny_list( &file_ace);
2080
2081 print_canon_ace_list( "dir ace - before deny", dir_ace);
2082 process_deny_list( &dir_ace);
2083
2084 /*
2085 * A well formed POSIX file or default ACL has at least 3 entries, a
2086 * SMB_ACL_USER_OBJ, SMB_ACL_GROUP_OBJ, SMB_ACL_OTHER_OBJ
2087 * and optionally a mask entry. Ensure this is the case.
2088 */
2089
2090 print_canon_ace_list( "file ace - before valid", file_ace);
2091
2092 /*
2093 * A default 3 element mode entry for a file should be r-- --- ---.
2094 * A default 3 element mode entry for a directory should be rwx --- ---.
2095 */
2096
2097 pst->st_mode = create_default_mode(fsp, False);
2098
2099 if (!ensure_canon_entry_valid(&file_ace, fsp->conn->params, fsp->is_directory, pfile_owner_sid, pfile_grp_sid, pst, True)) {
2100 free_canon_ace_list(file_ace);
2101 free_canon_ace_list(dir_ace);
2102 return False;
2103 }
2104
2105 print_canon_ace_list( "dir ace - before valid", dir_ace);
2106
2107 /*
2108 * A default inheritable 3 element mode entry for a directory should be the
2109 * mode Samba will use to create a file within. Ensure user rwx bits are set if
2110 * it's a directory.
2111 */
2112
2113 pst->st_mode = create_default_mode(fsp, True);
2114
2115 if (dir_ace && !ensure_canon_entry_valid(&dir_ace, fsp->conn->params, fsp->is_directory, pfile_owner_sid, pfile_grp_sid, pst, True)) {
2116 free_canon_ace_list(file_ace);
2117 free_canon_ace_list(dir_ace);
2118 return False;
2119 }
2120
2121 print_canon_ace_list( "file ace - return", file_ace);
2122 print_canon_ace_list( "dir ace - return", dir_ace);
2123
2124 *ppfile_ace = file_ace;
2125 *ppdir_ace = dir_ace;
2126 return True;
2127
2128 }
2129
2130 /******************************************************************************
2131 When returning permissions, try and fit NT display
2132 semantics if possible. Note the the canon_entries here must have been malloced.
2133 The list format should be - first entry = owner, followed by group and other user
2134 entries, last entry = other.
2135
2136 Note that this doesn't exactly match the NT semantics for an ACL. As POSIX entries
2137 are not ordered, and match on the most specific entry rather than walking a list,
2138 then a simple POSIX permission of rw-r--r-- should really map to 5 entries,
2139
2140 Entry 0: owner : deny all except read and write.
2141 Entry 1: owner : allow read and write.
2142 Entry 2: group : deny all except read.
2143 Entry 3: group : allow read.
2144 Entry 4: Everyone : allow read.
2145
2146 But NT cannot display this in their ACL editor !
2147 ********************************************************************************/
2148
2149 static void arrange_posix_perms(const char *filename, canon_ace **pp_list_head)
2150 {
2151 canon_ace *l_head = *pp_list_head;
2152 canon_ace *owner_ace = NULL;
2153 canon_ace *other_ace = NULL;
2154 canon_ace *ace = NULL;
2155
2156 for (ace = l_head; ace; ace = ace->next) {
2157 if (ace->type == SMB_ACL_USER_OBJ)
2158 owner_ace = ace;
2159 else if (ace->type == SMB_ACL_OTHER) {
2160 /* Last ace - this is "other" */
2161 other_ace = ace;
2162 }
2163 }
2164
2165 if (!owner_ace || !other_ace) {
2166 DEBUG(0,("arrange_posix_perms: Invalid POSIX permissions for file %s, missing owner or other.\n",
2167 filename ));
2168 return;
2169 }
2170
2171 /*
2172 * The POSIX algorithm applies to owner first, and other last,
2173 * so ensure they are arranged in this order.
2174 */
2175
2176 if (owner_ace) {
2177 DLIST_PROMOTE(l_head, owner_ace);
2178 }
2179
2180 if (other_ace) {
2181 DLIST_DEMOTE(l_head, other_ace, canon_ace *);
2182 }
2183
2184 /* We have probably changed the head of the list. */
2185
2186 *pp_list_head = l_head;
2187 }
2188
2189 /****************************************************************************
2190 Create a linked list of canonical ACE entries.
2191 ****************************************************************************/
2192
2193 static canon_ace *canonicalise_acl(struct connection_struct *conn,
2194 const char *fname, SMB_ACL_T posix_acl,
2195 const SMB_STRUCT_STAT *psbuf,
2196 const DOM_SID *powner, const DOM_SID *pgroup, struct pai_val *pal, SMB_ACL_TYPE_T the_acl_type)
2197 {
2198 mode_t acl_mask = (S_IRUSR|S_IWUSR|S_IXUSR);
2199 canon_ace *l_head = NULL;
2200 canon_ace *ace = NULL;
2201 canon_ace *next_ace = NULL;
2202 int entry_id = SMB_ACL_FIRST_ENTRY;
2203 SMB_ACL_ENTRY_T entry;
2204 size_t ace_count;
2205
2206 while ( posix_acl && (SMB_VFS_SYS_ACL_GET_ENTRY(conn, posix_acl, entry_id, &entry) == 1)) {
2207 SMB_ACL_TAG_T tagtype;
2208 SMB_ACL_PERMSET_T permset;
2209 DOM_SID sid;
2210 posix_id unix_ug;
2211 enum ace_owner owner_type;
2212
2213 entry_id = SMB_ACL_NEXT_ENTRY;
2214
2215 /* Is this a MASK entry ? */
2216 if (SMB_VFS_SYS_ACL_GET_TAG_TYPE(conn, entry, &tagtype) == -1)
2217 continue;
2218
2219 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, entry, &permset) == -1)
2220 continue;
2221
2222 /* Decide which SID to use based on the ACL type. */
2223 switch(tagtype) {
2224 case SMB_ACL_USER_OBJ:
2225 /* Get the SID from the owner. */
2226 sid_copy(&sid, powner);
2227 unix_ug.uid = psbuf->st_uid;
2228 owner_type = UID_ACE;
2229 break;
2230 case SMB_ACL_USER:
2231 {
2232 uid_t *puid = (uid_t *)SMB_VFS_SYS_ACL_GET_QUALIFIER(conn, entry);
2233 if (puid == NULL) {
2234 DEBUG(0,("canonicalise_acl: Failed to get uid.\n"));
2235 continue;
2236 }
2237 /*
2238 * A SMB_ACL_USER entry for the owner is shadowed by the
2239 * SMB_ACL_USER_OBJ entry and Windows also cannot represent
2240 * that entry, so we ignore it. We also don't create such
2241 * entries out of the blue when setting ACLs, so a get/set
2242 * cycle will drop them.
2243 */
2244 if (the_acl_type == SMB_ACL_TYPE_ACCESS && *puid == psbuf->st_uid) {
2245 SMB_VFS_SYS_ACL_FREE_QUALIFIER(conn, (void *)puid,tagtype);
2246 continue;
2247 }
2248 uid_to_sid( &sid, *puid);
2249 unix_ug.uid = *puid;
2250 owner_type = UID_ACE;
2251 SMB_VFS_SYS_ACL_FREE_QUALIFIER(conn, (void *)puid,tagtype);
2252 break;
2253 }
2254 case SMB_ACL_GROUP_OBJ:
2255 /* Get the SID from the owning group. */
2256 sid_copy(&sid, pgroup);
2257 unix_ug.gid = psbuf->st_gid;
2258 owner_type = GID_ACE;
2259 break;
2260 case SMB_ACL_GROUP:
2261 {
2262 gid_t *pgid = (gid_t *)SMB_VFS_SYS_ACL_GET_QUALIFIER(conn, entry);
2263 if (pgid == NULL) {
2264 DEBUG(0,("canonicalise_acl: Failed to get gid.\n"));
2265 continue;
2266 }
2267 gid_to_sid( &sid, *pgid);
2268 unix_ug.gid = *pgid;
2269 owner_type = GID_ACE;
2270 SMB_VFS_SYS_ACL_FREE_QUALIFIER(conn, (void *)pgid,tagtype);
2271 break;
2272 }
2273 case SMB_ACL_MASK:
2274 acl_mask = convert_permset_to_mode_t(conn, permset);
2275 continue; /* Don't count the mask as an entry. */
2276 case SMB_ACL_OTHER:
2277 /* Use the Everyone SID */
2278 sid = global_sid_World;
2279 unix_ug.world = -1;
2280 owner_type = WORLD_ACE;
2281 break;
2282 default:
2283 DEBUG(0,("canonicalise_acl: Unknown tagtype %u\n", (unsigned int)tagtype));
2284 continue;
2285 }
2286
2287 /*
2288 * Add this entry to the list.
2289 */
2290
2291 if ((ace = SMB_MALLOC_P(canon_ace)) == NULL)
2292 goto fail;
2293
2294 ZERO_STRUCTP(ace);
2295 ace->type = tagtype;
2296 ace->perms = convert_permset_to_mode_t(conn, permset);
2297 ace->attr = ALLOW_ACE;
2298 ace->trustee = sid;
2299 ace->unix_ug = unix_ug;
2300 ace->owner_type = owner_type;
2301 ace->inherited = get_inherited_flag(pal, ace, (the_acl_type == SMB_ACL_TYPE_DEFAULT));
2302
2303 DLIST_ADD(l_head, ace);
2304 }
2305
2306 /*
2307 * This next call will ensure we have at least a user/group/world set.
2308 */
2309
2310 if (!ensure_canon_entry_valid(&l_head, conn->params,
2311 S_ISDIR(psbuf->st_mode), powner, pgroup,
2312 psbuf, False))
2313 goto fail;
2314
2315 /*
2316 * Now go through the list, masking the permissions with the
2317 * acl_mask. Ensure all DENY Entries are at the start of the list.
2318 */
2319
2320 DEBUG(10,("canonicalise_acl: %s ace entries before arrange :\n", the_acl_type == SMB_ACL_TYPE_ACCESS ? "Access" : "Default" ));
2321
2322 for ( ace_count = 0, ace = l_head; ace; ace = next_ace, ace_count++) {
2323 next_ace = ace->next;
2324
2325 /* Masks are only applied to entries other than USER_OBJ and OTHER. */
2326 if (ace->type != SMB_ACL_OTHER && ace->type != SMB_ACL_USER_OBJ)
2327 ace->perms &= acl_mask;
2328
2329 if (ace->perms == 0) {
2330 DLIST_PROMOTE(l_head, ace);
2331 }
2332
2333 if( DEBUGLVL( 10 ) ) {
2334 print_canon_ace(ace, ace_count);
2335 }
2336 }
2337
2338 arrange_posix_perms(fname,&l_head );
2339
2340 print_canon_ace_list( "canonicalise_acl: ace entries after arrange", l_head );
2341
2342 return l_head;
2343
2344 fail:
2345
2346 free_canon_ace_list(l_head);
2347 return NULL;
2348 }
2349
2350 /****************************************************************************
2351 Check if the current user group list contains a given group.
2352 ****************************************************************************/
2353
2354 static bool current_user_in_group(gid_t gid)
2355 {
2356 int i;
2357
2358 for (i = 0; i < current_user.ut.ngroups; i++) {
2359 if (current_user.ut.groups[i] == gid) {
2360 return True;
2361 }
2362 }
2363
2364 return False;
2365 }
2366
2367 /****************************************************************************
2368 Should we override a deny ? Check 'acl group control' and 'dos filemode'.
2369 ****************************************************************************/
2370
2371 static bool acl_group_override(connection_struct *conn,
2372 gid_t prim_gid,
2373 const char *fname)
2374 {
2375 SMB_STRUCT_STAT sbuf;
2376
2377 if ((errno != EPERM) && (errno != EACCES)) {
2378 return false;
2379 }
2380
2381 /* file primary group == user primary or supplementary group */
2382 if (lp_acl_group_control(SNUM(conn)) &&
2383 current_user_in_group(prim_gid)) {
2384 return true;
2385 }
2386
2387 /* user has writeable permission */
2388 if (lp_dos_filemode(SNUM(conn)) &&
2389 can_write_to_file(conn, fname, &sbuf)) {
2390 return true;
2391 }
2392
2393 return false;
2394 }
2395
2396 /****************************************************************************
2397 Attempt to apply an ACL to a file or directory.
2398 ****************************************************************************/
2399
2400 static bool set_canon_ace_list(files_struct *fsp, canon_ace *the_ace, bool default_ace, gid_t prim_gid, bool *pacl_set_support)
2401 {
2402 connection_struct *conn = fsp->conn;
2403 bool ret = False;
2404 SMB_ACL_T the_acl = SMB_VFS_SYS_ACL_INIT(conn, (int)count_canon_ace_list(the_ace) + 1);
2405 canon_ace *p_ace;
2406 int i;
2407 SMB_ACL_ENTRY_T mask_entry;
2408 bool got_mask_entry = False;
2409 SMB_ACL_PERMSET_T mask_permset;
2410 SMB_ACL_TYPE_T the_acl_type = (default_ace ? SMB_ACL_TYPE_DEFAULT : SMB_ACL_TYPE_ACCESS);
2411 bool needs_mask = False;
2412 mode_t mask_perms = 0;
2413
2414 #if defined(POSIX_ACL_NEEDS_MASK)
2415 /* HP-UX always wants to have a mask (called "class" there). */
2416 needs_mask = True;
2417 #endif
2418
2419 if (the_acl == NULL) {
2420
2421 if (!no_acl_syscall_error(errno)) {
2422 /*
2423 * Only print this error message if we have some kind of ACL
2424 * support that's not working. Otherwise we would always get this.
2425 */
2426 DEBUG(0,("set_canon_ace_list: Unable to init %s ACL. (%s)\n",
2427 default_ace ? "default" : "file", strerror(errno) ));
2428 }
2429 *pacl_set_support = False;
2430 return False;
2431 }
2432
2433 if( DEBUGLVL( 10 )) {
2434 dbgtext("set_canon_ace_list: setting ACL:\n");
2435 for (i = 0, p_ace = the_ace; p_ace; p_ace = p_ace->next, i++ ) {
2436 print_canon_ace( p_ace, i);
2437 }
2438 }
2439
2440 for (i = 0, p_ace = the_ace; p_ace; p_ace = p_ace->next, i++ ) {
2441 SMB_ACL_ENTRY_T the_entry;
2442 SMB_ACL_PERMSET_T the_permset;
2443
2444 /*
2445 * ACLs only "need" an ACL_MASK entry if there are any named user or
2446 * named group entries. But if there is an ACL_MASK entry, it applies
2447 * to ACL_USER, ACL_GROUP, and ACL_GROUP_OBJ entries. Set the mask
2448 * so that it doesn't deny (i.e., mask off) any permissions.
2449 */
2450
2451 if (p_ace->type == SMB_ACL_USER || p_ace->type == SMB_ACL_GROUP) {
2452 needs_mask = True;
2453 mask_perms |= p_ace->perms;
2454 } else if (p_ace->type == SMB_ACL_GROUP_OBJ) {
2455 mask_perms |= p_ace->perms;
2456 }
2457
2458 /*
2459 * Get the entry for this ACE.
2460 */
2461
2462 if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &the_acl, &the_entry) == -1) {
2463 DEBUG(0,("set_canon_ace_list: Failed to create entry %d. (%s)\n",
2464 i, strerror(errno) ));
2465 goto fail;
2466 }
2467
2468 if (p_ace->type == SMB_ACL_MASK) {
2469 mask_entry = the_entry;
2470 got_mask_entry = True;
2471 }
2472
2473 /*
2474 * Ok - we now know the ACL calls should be working, don't
2475 * allow fallback to chmod.
2476 */
2477
2478 *pacl_set_support = True;
2479
2480 /*
2481 * Initialise the entry from the canon_ace.
2482 */
2483
2484 /*
2485 * First tell the entry what type of ACE this is.
2486 */
2487
2488 if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, the_entry, p_ace->type) == -1) {
2489 DEBUG(0,("set_canon_ace_list: Failed to set tag type on entry %d. (%s)\n",
2490 i, strerror(errno) ));
2491 goto fail;
2492 }
2493
2494 /*
2495 * Only set the qualifier (user or group id) if the entry is a user
2496 * or group id ACE.
2497 */
2498
2499 if ((p_ace->type == SMB_ACL_USER) || (p_ace->type == SMB_ACL_GROUP)) {
2500 if (SMB_VFS_SYS_ACL_SET_QUALIFIER(conn, the_entry,(void *)&p_ace->unix_ug.uid) == -1) {
2501 DEBUG(0,("set_canon_ace_list: Failed to set qualifier on entry %d. (%s)\n",
2502 i, strerror(errno) ));
2503 goto fail;
2504 }
2505 }
2506
2507 /*
2508 * Convert the mode_t perms in the canon_ace to a POSIX permset.
2509 */
2510
2511 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, the_entry, &the_permset) == -1) {
2512 DEBUG(0,("set_canon_ace_list: Failed to get permset on entry %d. (%s)\n",
2513 i, strerror(errno) ));
2514 goto fail;
2515 }
2516
2517 if (map_acl_perms_to_permset(conn, p_ace->perms, &the_permset) == -1) {
2518 DEBUG(0,("set_canon_ace_list: Failed to create permset for mode (%u) on entry %d. (%s)\n",
2519 (unsigned int)p_ace->perms, i, strerror(errno) ));
2520 goto fail;
2521 }
2522
2523 /*
2524 * ..and apply them to the entry.
2525 */
2526
2527 if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, the_entry, the_permset) == -1) {
2528 DEBUG(0,("set_canon_ace_list: Failed to add permset on entry %d. (%s)\n",
2529 i, strerror(errno) ));
2530 goto fail;
2531 }
2532
2533 if( DEBUGLVL( 10 ))
2534 print_canon_ace( p_ace, i);
2535
2536 }
2537
2538 if (needs_mask && !got_mask_entry) {
2539 if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &the_acl, &mask_entry) == -1) {
2540 DEBUG(0,("set_canon_ace_list: Failed to create mask entry. (%s)\n", strerror(errno) ));
2541 goto fail;
2542 }
2543
2544 if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, mask_entry, SMB_ACL_MASK) == -1) {
2545 DEBUG(0,("set_canon_ace_list: Failed to set tag type on mask entry. (%s)\n",strerror(errno) ));
2546 goto fail;
2547 }
2548
2549 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, mask_entry, &mask_permset) == -1) {
2550 DEBUG(0,("set_canon_ace_list: Failed to get mask permset. (%s)\n", strerror(errno) ));
2551 goto fail;
2552 }
2553
2554 if (map_acl_perms_to_permset(conn, S_IRUSR|S_IWUSR|S_IXUSR, &mask_permset) == -1) {
2555 DEBUG(0,("set_canon_ace_list: Failed to create mask permset. (%s)\n", strerror(errno) ));
2556 goto fail;
2557 }
2558
2559 if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, mask_entry, mask_permset) == -1) {
2560 DEBUG(0,("set_canon_ace_list: Failed to add mask permset. (%s)\n", strerror(errno) ));
2561 goto fail;
2562 }
2563 }
2564
2565 /*
2566 * Finally apply it to the file or directory.
2567 */
2568
2569 if(default_ace || fsp->is_directory || fsp->fh->fd == -1) {
2570 if (SMB_VFS_SYS_ACL_SET_FILE(conn, fsp->fsp_name, the_acl_type, the_acl) == -1) {
2571 /*
2572 * Some systems allow all the above calls and only fail with no ACL support
2573 * when attempting to apply the acl. HPUX with HFS is an example of this. JRA.
2574 */
2575 if (no_acl_syscall_error(errno)) {
2576 *pacl_set_support = False;
2577 }
2578
2579 if (acl_group_override(conn, prim_gid, fsp->fsp_name)) {
2580 int sret;
2581
2582 DEBUG(5,("set_canon_ace_list: acl group control on and current user in file %s primary group.\n",
2583 fsp->fsp_name ));
2584
2585 become_root();
2586 sret = SMB_VFS_SYS_ACL_SET_FILE(conn, fsp->fsp_name, the_acl_type, the_acl);
2587 unbecome_root();
2588 if (sret == 0) {
2589 ret = True;
2590 }
2591 }
2592
2593 if (ret == False) {
2594 DEBUG(2,("set_canon_ace_list: sys_acl_set_file type %s failed for file %s (%s).\n",
2595 the_acl_type == SMB_ACL_TYPE_DEFAULT ? "directory default" : "file",
2596 fsp->fsp_name, strerror(errno) ));
2597 goto fail;
2598 }
2599 }
2600 } else {
2601 if (SMB_VFS_SYS_ACL_SET_FD(fsp, the_acl) == -1) {
2602 /*
2603 * Some systems allow all the above calls and only fail with no ACL support
2604 * when attempting to apply the acl. HPUX with HFS is an example of this. JRA.
2605 */
2606 if (no_acl_syscall_error(errno)) {
2607 *pacl_set_support = False;
2608 }
2609
2610 if (acl_group_override(conn, prim_gid, fsp->fsp_name)) {
2611 int sret;
2612
2613 DEBUG(5,("set_canon_ace_list: acl group control on and current user in file %s primary group.\n",
2614 fsp->fsp_name ));
2615
2616 become_root();
2617 sret = SMB_VFS_SYS_ACL_SET_FD(fsp, the_acl);
2618 unbecome_root();
2619 if (sret == 0) {
2620 ret = True;
2621 }
2622 }
2623
2624 if (ret == False) {
2625 DEBUG(2,("set_canon_ace_list: sys_acl_set_file failed for file %s (%s).\n",
2626 fsp->fsp_name, strerror(errno) ));
2627 goto fail;
2628 }
2629 }
2630 }
2631
2632 ret = True;
2633
2634 fail:
2635
2636 if (the_acl != NULL) {
2637 SMB_VFS_SYS_ACL_FREE_ACL(conn, the_acl);
2638 }
2639
2640 return ret;
2641 }
2642
2643 /****************************************************************************
2644 Find a particular canon_ace entry.
2645 ****************************************************************************/
2646
2647 static struct canon_ace *canon_ace_entry_for(struct canon_ace *list, SMB_ACL_TAG_T type, posix_id *id)
2648 {
2649 while (list) {
2650 if (list->type == type && ((type != SMB_ACL_USER && type != SMB_ACL_GROUP) ||
2651 (type == SMB_ACL_USER && id && id->uid == list->unix_ug.uid) ||
2652 (type == SMB_ACL_GROUP && id && id->gid == list->unix_ug.gid)))
2653 break;
2654 list = list->next;
2655 }
2656 return list;
2657 }
2658
2659 /****************************************************************************
2660
2661 ****************************************************************************/
2662
2663 SMB_ACL_T free_empty_sys_acl(connection_struct *conn, SMB_ACL_T the_acl)
2664 {
2665 SMB_ACL_ENTRY_T entry;
2666
2667 if (!the_acl)
2668 return NULL;
2669 if (SMB_VFS_SYS_ACL_GET_ENTRY(conn, the_acl, SMB_ACL_FIRST_ENTRY, &entry) != 1) {
2670 SMB_VFS_SYS_ACL_FREE_ACL(conn, the_acl);
2671 return NULL;
2672 }
2673 return the_acl;
2674 }
2675
2676 /****************************************************************************
2677 Convert a canon_ace to a generic 3 element permission - if possible.
2678 ****************************************************************************/
2679
2680 #define MAP_PERM(p,mask,result) (((p) & (mask)) ? (result) : 0 )
2681
2682 static bool convert_canon_ace_to_posix_perms( files_struct *fsp, canon_ace *file_ace_list, mode_t *posix_perms)
2683 {
2684 int snum = SNUM(fsp->conn);
2685 size_t ace_count = count_canon_ace_list(file_ace_list);
2686 canon_ace *ace_p;
2687 canon_ace *owner_ace = NULL;
2688 canon_ace *group_ace = NULL;
2689 canon_ace *other_ace = NULL;
2690 mode_t and_bits;
2691 mode_t or_bits;
2692
2693 if (ace_count != 3) {
2694 DEBUG(3,("convert_canon_ace_to_posix_perms: Too many ACE entries for file %s to convert to \
2695 posix perms.\n", fsp->fsp_name ));
2696 return False;
2697 }
2698
2699 for (ace_p = file_ace_list; ace_p; ace_p = ace_p->next) {
2700 if (ace_p->owner_type == UID_ACE)
2701 owner_ace = ace_p;
2702 else if (ace_p->owner_type == GID_ACE)
2703 group_ace = ace_p;
2704 else if (ace_p->owner_type == WORLD_ACE)
2705 other_ace = ace_p;
2706 }
2707
2708 if (!owner_ace || !group_ace || !other_ace) {
2709 DEBUG(3,("convert_canon_ace_to_posix_perms: Can't get standard entries for file %s.\n",
2710 fsp->fsp_name ));
2711 return False;
2712 }
2713
2714 *posix_perms = (mode_t)0;
2715
2716 *posix_perms |= owner_ace->perms;
2717 *posix_perms |= MAP_PERM(group_ace->perms, S_IRUSR, S_IRGRP);
2718 *posix_perms |= MAP_PERM(group_ace->perms, S_IWUSR, S_IWGRP);
2719 *posix_perms |= MAP_PERM(group_ace->perms, S_IXUSR, S_IXGRP);
2720 *posix_perms |= MAP_PERM(other_ace->perms, S_IRUSR, S_IROTH);
2721 *posix_perms |= MAP_PERM(other_ace->perms, S_IWUSR, S_IWOTH);
2722 *posix_perms |= MAP_PERM(other_ace->perms, S_IXUSR, S_IXOTH);
2723
2724 /* The owner must have at least read access. */
2725
2726 *posix_perms |= S_IRUSR;
2727 if (fsp->is_directory)
2728 *posix_perms |= (S_IWUSR|S_IXUSR);
2729
2730 /* If requested apply the masks. */
2731
2732 /* Get the initial bits to apply. */
2733
2734 if (fsp->is_directory) {
2735 and_bits = lp_dir_security_mask(snum);
2736 or_bits = lp_force_dir_security_mode(snum);
2737 } else {
2738 and_bits = lp_security_mask(snum);
2739 or_bits = lp_force_security_mode(snum);
2740 }
2741
2742 *posix_perms = (((*posix_perms) & and_bits)|or_bits);
2743
2744 DEBUG(10,("convert_canon_ace_to_posix_perms: converted u=%o,g=%o,w=%o to perm=0%o for file %s.\n",
2745 (int)owner_ace->perms, (int)group_ace->perms, (int)other_ace->perms, (int)*posix_perms,
2746 fsp->fsp_name ));
2747
2748 return True;
2749 }
2750
2751 /****************************************************************************
2752 Incoming NT ACLs on a directory can be split into a default POSIX acl (CI|OI|IO) and
2753 a normal POSIX acl. Win2k needs these split acls re-merging into one ACL
2754 with CI|OI set so it is inherited and also applies to the directory.
2755 Based on code from "Jim McDonough" <jmcd@us.ibm.com>.
2756 ****************************************************************************/
2757
2758 static size_t merge_default_aces( SEC_ACE *nt_ace_list, size_t num_aces)
2759 {
2760 size_t i, j;
2761
2762 for (i = 0; i < num_aces; i++) {
2763 for (j = i+1; j < num_aces; j++) {
2764 uint32 i_flags_ni = (nt_ace_list[i].flags & ~SEC_ACE_FLAG_INHERITED_ACE);
2765 uint32 j_flags_ni = (nt_ace_list[j].flags & ~SEC_ACE_FLAG_INHERITED_ACE);
2766 bool i_inh = (nt_ace_list[i].flags & SEC_ACE_FLAG_INHERITED_ACE) ? True : False;
2767 bool j_inh = (nt_ace_list[j].flags & SEC_ACE_FLAG_INHERITED_ACE) ? True : False;
2768
2769 /* We know the lower number ACE's are file entries. */
2770 if ((nt_ace_list[i].type == nt_ace_list[j].type) &&
2771 (nt_ace_list[i].size == nt_ace_list[j].size) &&
2772 (nt_ace_list[i].access_mask == nt_ace_list[j].access_mask) &&
2773 sid_equal(&nt_ace_list[i].trustee, &nt_ace_list[j].trustee) &&
2774 (i_inh == j_inh) &&
2775 (i_flags_ni == 0) &&
2776 (j_flags_ni == (SEC_ACE_FLAG_OBJECT_INHERIT|
2777 SEC_ACE_FLAG_CONTAINER_INHERIT|
2778 SEC_ACE_FLAG_INHERIT_ONLY))) {
2779 /*
2780 * W2K wants to have access allowed zero access ACE's
2781 * at the end of the list. If the mask is zero, merge
2782 * the non-inherited ACE onto the inherited ACE.
2783 */
2784
2785 if (nt_ace_list[i].access_mask == 0) {
2786 nt_ace_list[j].flags = SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT|
2787 (i_inh ? SEC_ACE_FLAG_INHERITED_ACE : 0);
2788 if (num_aces - i - 1 > 0)
2789 memmove(&nt_ace_list[i], &nt_ace_list[i+1], (num_aces-i-1) *
2790 sizeof(SEC_ACE));
2791
2792 DEBUG(10,("merge_default_aces: Merging zero access ACE %u onto ACE %u.\n",
2793 (unsigned int)i, (unsigned int)j ));
2794 } else {
2795 /*
2796 * These are identical except for the flags.
2797 * Merge the inherited ACE onto the non-inherited ACE.
2798 */
2799
2800 nt_ace_list[i].flags = SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT|
2801 (i_inh ? SEC_ACE_FLAG_INHERITED_ACE : 0);
2802 if (num_aces - j - 1 > 0)
2803 memmove(&nt_ace_list[j], &nt_ace_list[j+1], (num_aces-j-1) *
2804 sizeof(SEC_ACE));
2805
2806 DEBUG(10,("merge_default_aces: Merging ACE %u onto ACE %u.\n",
2807 (unsigned int)j, (unsigned int)i ));
2808 }
2809 num_aces--;
2810 break;
2811 }
2812 }
2813 }
2814
2815 return num_aces;
2816 }
2817
2818 /*
2819 * Add or Replace ACE entry.
2820 * In some cases we need to add a specific ACE for compatibility reasons.
2821 * When doing that we must make sure we are not actually creating a duplicate
2822 * entry. So we need to search whether an ACE entry already exist and eventually
2823 * replacce the access mask, or add a completely new entry if none was found.
2824 *
2825 * This function assumes the array has enough space to add a new entry without
2826 * any reallocation of memory.
2827 */
2828
2829 static void add_or_replace_ace(SEC_ACE *nt_ace_list, size_t *num_aces,
2830 const DOM_SID *sid, enum security_ace_type type,
2831 uint32_t mask, uint8_t flags)
2832 {
2833 int i;
2834
2835 /* first search for a duplicate */
2836 for (i = 0; i < *num_aces; i++) {
2837 if (sid_equal(&nt_ace_list[i].trustee, sid) &&
2838 (nt_ace_list[i].flags == flags)) break;
2839 }
2840
2841 if (i < *num_aces) { /* found */
2842 nt_ace_list[i].type = type;
2843 nt_ace_list[i].access_mask = mask;
2844 DEBUG(10, ("Replacing ACE %d with SID %s and flags %02x\n",
2845 i, sid_string_dbg(sid), flags));
2846 return;
2847 }
2848
2849 /* not found, append it */
2850 init_sec_ace(&nt_ace_list[(*num_aces)++], sid, type, mask, flags);
2851 }
2852
2853
2854 /****************************************************************************
2855 Reply to query a security descriptor from an fsp. If it succeeds it allocates
2856 the space for the return elements and returns the size needed to return the
2857 security descriptor. This should be the only external function needed for
2858 the UNIX style get ACL.
2859 ****************************************************************************/
2860
2861 static NTSTATUS posix_get_nt_acl_common(struct connection_struct *conn,
2862 const char *name,
2863 const SMB_STRUCT_STAT *sbuf,
2864 struct pai_val *pal,
2865 SMB_ACL_T posix_acl,
2866 SMB_ACL_T def_acl,
2867 uint32_t security_info,
2868 SEC_DESC **ppdesc)
2869 {
2870 DOM_SID owner_sid;
2871 DOM_SID group_sid;
2872 size_t sd_size = 0;
2873 SEC_ACL *psa = NULL;
2874 size_t num_acls = 0;
2875 size_t num_def_acls = 0;
2876 size_t num_aces = 0;
2877 canon_ace *file_ace = NULL;
2878 canon_ace *dir_ace = NULL;
2879 SEC_ACE *nt_ace_list = NULL;
2880 size_t num_profile_acls = 0;
2881 SEC_DESC *psd = NULL;
2882
2883 /*
2884 * Get the owner, group and world SIDs.
2885 */
2886
2887 if (lp_profile_acls(SNUM(conn))) {
2888 /* For WXP SP1 the owner must be administrators. */
2889 sid_copy(&owner_sid, &global_sid_Builtin_Administrators);
2890 sid_copy(&group_sid, &global_sid_Builtin_Users);
2891 num_profile_acls = 2;
2892 } else {
2893 create_file_sids(sbuf, &owner_sid, &group_sid);
2894 }
2895
2896 if ((security_info & DACL_SECURITY_INFORMATION) && !(security_info & PROTECTED_DACL_SECURITY_INFORMATION)) {
2897
2898 /*
2899 * In the optimum case Creator Owner and Creator Group would be used for
2900 * the ACL_USER_OBJ and ACL_GROUP_OBJ entries, respectively, but this
2901 * would lead to usability problems under Windows: The Creator entries
2902 * are only available in browse lists of directories and not for files;
2903 * additionally the identity of the owning group couldn't be determined.
2904 * We therefore use those identities only for Default ACLs.
2905 */
2906
2907 /* Create the canon_ace lists. */
2908 file_ace = canonicalise_acl(conn, name, posix_acl, sbuf,
2909 &owner_sid, &group_sid, pal,
2910 SMB_ACL_TYPE_ACCESS);
2911
2912 /* We must have *some* ACLS. */
2913
2914 if (count_canon_ace_list(file_ace) == 0) {
2915 DEBUG(0,("get_nt_acl : No ACLs on file (%s) !\n", name));
2916 goto done;
2917 }
2918
2919 if (S_ISDIR(sbuf->st_mode) && def_acl) {
2920 dir_ace = canonicalise_acl(conn, name, def_acl,
2921 sbuf,
2922 &global_sid_Creator_Owner,
2923 &global_sid_Creator_Group,
2924 pal, SMB_ACL_TYPE_DEFAULT);
2925 }
2926
2927 /*
2928 * Create the NT ACE list from the canonical ace lists.
2929 */
2930
2931 {
2932 canon_ace *ace;
2933 enum security_ace_type nt_acl_type;
2934
2935 if (nt4_compatible_acls() && dir_ace) {
2936 /*
2937 * NT 4 chokes if an ACL contains an INHERIT_ONLY entry
2938 * but no non-INHERIT_ONLY entry for one SID. So we only
2939 * remove entries from the Access ACL if the
2940 * corresponding Default ACL entries have also been
2941 * removed. ACEs for CREATOR-OWNER and CREATOR-GROUP
2942 * are exceptions. We can do nothing
2943 * intelligent if the Default ACL contains entries that
2944 * are not also contained in the Access ACL, so this
2945 * case will still fail under NT 4.
2946 */
2947
2948 ace = canon_ace_entry_for(dir_ace, SMB_ACL_OTHER, NULL);
2949 if (ace && !ace->perms) {
2950 DLIST_REMOVE(dir_ace, ace);
2951 SAFE_FREE(ace);
2952
2953 ace = canon_ace_entry_for(file_ace, SMB_ACL_OTHER, NULL);
2954 if (ace && !ace->perms) {
2955 DLIST_REMOVE(file_ace, ace);
2956 SAFE_FREE(ace);
2957 }
2958 }
2959
2960 /*
2961 * WinNT doesn't usually have Creator Group
2962 * in browse lists, so we send this entry to
2963 * WinNT even if it contains no relevant
2964 * permissions. Once we can add
2965 * Creator Group to browse lists we can
2966 * re-enable this.
2967 */
2968
2969 #if 0
2970 ace = canon_ace_entry_for(dir_ace, SMB_ACL_GROUP_OBJ, NULL);
2971 if (ace && !ace->perms) {
2972 DLIST_REMOVE(dir_ace, ace);
2973 SAFE_FREE(ace);
2974 }
2975 #endif
2976
2977 ace = canon_ace_entry_for(file_ace, SMB_ACL_GROUP_OBJ, NULL);
2978 if (ace && !ace->perms) {
2979 DLIST_REMOVE(file_ace, ace);
2980 SAFE_FREE(ace);
2981 }
2982 }
2983
2984 num_acls = count_canon_ace_list(file_ace);
2985 num_def_acls = count_canon_ace_list(dir_ace);
2986
2987 /* Allocate the ace list. */
2988 if ((nt_ace_list = SMB_MALLOC_ARRAY(SEC_ACE,num_acls + num_profile_acls + num_def_acls)) == NULL) {
2989 DEBUG(0,("get_nt_acl: Unable to malloc space for nt_ace_list.\n"));
2990 goto done;
2991 }
2992
2993 memset(nt_ace_list, '\0', (num_acls + num_def_acls) * sizeof(SEC_ACE) );
2994
2995 /*
2996 * Create the NT ACE list from the canonical ace lists.
2997 */
2998
2999 for (ace = file_ace; ace != NULL; ace = ace->next) {
3000 uint32_t acc = map_canon_ace_perms(SNUM(conn),
3001 &nt_acl_type,
3002 ace->perms,
3003 S_ISDIR(sbuf->st_mode));
3004 init_sec_ace(&nt_ace_list[num_aces++],
3005 &ace->trustee,
3006 nt_acl_type,
3007 acc,
3008 ace->inherited ?
3009 SEC_ACE_FLAG_INHERITED_ACE : 0);
3010 }
3011
3012 /* The User must have access to a profile share - even
3013 * if we can't map the SID. */
3014 if (lp_profile_acls(SNUM(conn))) {
3015 add_or_replace_ace(nt_ace_list, &num_aces,
3016 &global_sid_Builtin_Users,
3017 SEC_ACE_TYPE_ACCESS_ALLOWED,
3018 FILE_GENERIC_ALL, 0);
3019 }
3020
3021 for (ace = dir_ace; ace != NULL; ace = ace->next) {
3022 uint32_t acc = map_canon_ace_perms(SNUM(conn),
3023 &nt_acl_type,
3024 ace->perms,
3025 S_ISDIR(sbuf->st_mode));
3026 init_sec_ace(&nt_ace_list[num_aces++],
3027 &ace->trustee,
3028 nt_acl_type,
3029 acc,
3030 SEC_ACE_FLAG_OBJECT_INHERIT|
3031 SEC_ACE_FLAG_CONTAINER_INHERIT|
3032 SEC_ACE_FLAG_INHERIT_ONLY|
3033 (ace->inherited ?
3034 SEC_ACE_FLAG_INHERITED_ACE : 0));
3035 }
3036
3037 /* The User must have access to a profile share - even
3038 * if we can't map the SID. */
3039 if (lp_profile_acls(SNUM(conn))) {
3040 add_or_replace_ace(nt_ace_list, &num_aces,
3041 &global_sid_Builtin_Users,
3042 SEC_ACE_TYPE_ACCESS_ALLOWED,
3043 FILE_GENERIC_ALL,
3044 SEC_ACE_FLAG_OBJECT_INHERIT |
3045 SEC_ACE_FLAG_CONTAINER_INHERIT |
3046 SEC_ACE_FLAG_INHERIT_ONLY);
3047 }
3048
3049 /*
3050 * Merge POSIX default ACLs and normal ACLs into one NT ACE.
3051 * Win2K needs this to get the inheritance correct when replacing ACLs
3052 * on a directory tree. Based on work by Jim @ IBM.
3053 */
3054
3055 num_aces = merge_default_aces(nt_ace_list, num_aces);
3056
3057 }
3058
3059 if (num_aces) {
3060 if((psa = make_sec_acl( talloc_tos(), NT4_ACL_REVISION, num_aces, nt_ace_list)) == NULL) {
3061 DEBUG(0,("get_nt_acl: Unable to malloc space for acl.\n"));
3062 goto done;
3063 }
3064 }
3065 } /* security_info & DACL_SECURITY_INFORMATION */
3066
3067 psd = make_standard_sec_desc( talloc_tos(),
3068 (security_info & OWNER_SECURITY_INFORMATION) ? &owner_sid : NULL,
3069 (security_info & GROUP_SECURITY_INFORMATION) ? &group_sid : NULL,
3070 psa,
3071 &sd_size);
3072
3073 if(!psd) {
3074 DEBUG(0,("get_nt_acl: Unable to malloc space for security descriptor.\n"));
3075 sd_size = 0;
3076 goto done;
3077 }
3078
3079 /*
3080 * Windows 2000: The DACL_PROTECTED flag in the security
3081 * descriptor marks the ACL as non-inheriting, i.e., no
3082 * ACEs from higher level directories propagate to this
3083 * ACL. In the POSIX ACL model permissions are only
3084 * inherited at file create time, so ACLs never contain
3085 * any ACEs that are inherited dynamically. The DACL_PROTECTED
3086 * flag doesn't seem to bother Windows NT.
3087 * Always set this if map acl inherit is turned off.
3088 */
3089 if (get_protected_flag(pal) || !lp_map_acl_inherit(SNUM(conn))) {
3090 psd->type |= SE_DESC_DACL_PROTECTED;
3091 }
3092
3093 if (psd->dacl) {
3094 dacl_sort_into_canonical_order(psd->dacl->aces, (unsigned int)psd->dacl->num_aces);
3095 }
3096
3097 *ppdesc = psd;
3098
3099 done:
3100
3101 if (posix_acl) {
3102 SMB_VFS_SYS_ACL_FREE_ACL(conn, posix_acl);
3103 }
3104 if (def_acl) {
3105 SMB_VFS_SYS_ACL_FREE_ACL(conn, def_acl);
3106 }
3107 free_canon_ace_list(file_ace);
3108 free_canon_ace_list(dir_ace);
3109 free_inherited_info(pal);
3110 SAFE_FREE(nt_ace_list);
3111
3112 return NT_STATUS_OK;
3113 }
3114
3115 NTSTATUS posix_fget_nt_acl(struct files_struct *fsp, uint32_t security_info,
3116 SEC_DESC **ppdesc)
3117 {
3118 SMB_STRUCT_STAT sbuf;
3119 SMB_ACL_T posix_acl = NULL;
3120 struct pai_val *pal;
3121
3122 *ppdesc = NULL;
3123
3124 DEBUG(10,("posix_fget_nt_acl: called for file %s\n", fsp->fsp_name ));
3125
3126 /* can it happen that fsp_name == NULL ? */
3127 if (fsp->is_directory || fsp->fh->fd == -1) {
3128 return posix_get_nt_acl(fsp->conn, fsp->fsp_name,
3129 security_info, ppdesc);
3130 }
3131
3132 /* Get the stat struct for the owner info. */
3133 if(SMB_VFS_FSTAT(fsp, &sbuf) != 0) {
3134 return map_nt_error_from_unix(errno);
3135 }
3136
3137 /* Get the ACL from the fd. */
3138 posix_acl = SMB_VFS_SYS_ACL_GET_FD(fsp);
3139
3140 pal = fload_inherited_info(fsp);
3141
3142 return posix_get_nt_acl_common(fsp->conn, fsp->fsp_name, &sbuf, pal,
3143 posix_acl, NULL, security_info, ppdesc);
3144 }
3145
3146 NTSTATUS posix_get_nt_acl(struct connection_struct *conn, const char *name,
3147 uint32_t security_info, SEC_DESC **ppdesc)
3148 {
3149 SMB_STRUCT_STAT sbuf;
3150 SMB_ACL_T posix_acl = NULL;
3151 SMB_ACL_T def_acl = NULL;
3152 struct pai_val *pal;
3153
3154 *ppdesc = NULL;
3155
3156 DEBUG(10,("posix_get_nt_acl: called for file %s\n", name ));
3157
3158 /* Get the stat struct for the owner info. */
3159 if(SMB_VFS_STAT(conn, name, &sbuf) != 0) {
3160 return map_nt_error_from_unix(errno);
3161 }
3162
3163 /* Get the ACL from the path. */
3164 posix_acl = SMB_VFS_SYS_ACL_GET_FILE(conn, name, SMB_ACL_TYPE_ACCESS);
3165
3166 /* If it's a directory get the default POSIX ACL. */
3167 if(S_ISDIR(sbuf.st_mode)) {
3168 def_acl = SMB_VFS_SYS_ACL_GET_FILE(conn, name, SMB_ACL_TYPE_DEFAULT);
3169 def_acl = free_empty_sys_acl(conn, def_acl);
3170 }
3171
3172 pal = load_inherited_info(conn, name);
3173
3174 return posix_get_nt_acl_common(conn, name, &sbuf, pal, posix_acl,
3175 def_acl, security_info, ppdesc);
3176 }
3177
3178 /****************************************************************************
3179 Try to chown a file. We will be able to chown it under the following conditions.
3180
3181 1) If we have root privileges, then it will just work.
3182 2) If we have SeTakeOwnershipPrivilege we can change the user to the current user.
3183 3) If we have SeRestorePrivilege we can change the user to any other user.
3184 4) If we have write permission to the file and dos_filemodes is set
3185 then allow chown to the currently authenticated user.
3186 ****************************************************************************/
3187
3188 int try_chown(connection_struct *conn, const char *fname, uid_t uid, gid_t gid)
3189 {
3190 int ret;
3191 files_struct *fsp;
3192 SMB_STRUCT_STAT st;
3193
3194 if(!CAN_WRITE(conn)) {
3195 return -1;
3196 }
3197
3198 /* Case (1). */
3199 /* try the direct way first */
3200 ret = SMB_VFS_CHOWN(conn, fname, uid, gid);
3201 if (ret == 0)
3202 return 0;
3203
3204 /* Case (2) / (3) */
3205 if (lp_enable_privileges()) {
3206
3207 bool has_take_ownership_priv = user_has_privileges(current_user.nt_user_token,
3208 &se_take_ownership);
3209 bool has_restore_priv = user_has_privileges(current_user.nt_user_token,
3210 &se_restore);
3211
3212 /* Case (2) */
3213 if ( ( has_take_ownership_priv && ( uid == current_user.ut.uid ) ) ||
3214 /* Case (3) */
3215 ( has_restore_priv ) ) {
3216
3217 become_root();
3218 /* Keep the current file gid the same - take ownership doesn't imply group change. */
3219 ret = SMB_VFS_CHOWN(conn, fname, uid, (gid_t)-1);
3220 unbecome_root();
3221 return ret;
3222 }
3223 }
3224
3225 /* Case (4). */
3226 if (!lp_dos_filemode(SNUM(conn))) {
3227 errno = EPERM;
3228 return -1;
3229 }
3230
3231 /* only allow chown to the current user. This is more secure,
3232 and also copes with the case where the SID in a take ownership ACL is
3233 a local SID on the users workstation
3234 */
3235 if (uid != current_user.ut.uid) {
3236 errno = EPERM;
3237 return -1;
3238 }
3239
3240 if (SMB_VFS_STAT(conn,fname,&st)) {
3241 return -1;
3242 }
3243
3244 if (!NT_STATUS_IS_OK(open_file_fchmod(conn,fname,&st,&fsp))) {
3245 return -1;
3246 }
3247
3248 become_root();
3249 /* Keep the current file gid the same. */
3250 ret = SMB_VFS_FCHOWN(fsp, uid, (gid_t)-1);
3251 unbecome_root();
3252
3253 close_file_fchmod(fsp);
3254
3255 return ret;
3256 }
3257
3258 #if 0
3259 /* Disable this - prevents ACL inheritance from the ACL editor. JRA. */
3260
3261 /****************************************************************************
3262 Take care of parent ACL inheritance.
3263 ****************************************************************************/
3264
3265 NTSTATUS append_parent_acl(files_struct *fsp,
3266 const SEC_DESC *pcsd,
3267 SEC_DESC **pp_new_sd)
3268 {
3269 SEC_DESC *parent_sd = NULL;
3270 files_struct *parent_fsp = NULL;
3271 TALLOC_CTX *mem_ctx = talloc_tos();
3272 char *parent_name = NULL;
3273 SEC_ACE *new_ace = NULL;
3274 unsigned int num_aces = pcsd->dacl->num_aces;
3275 SMB_STRUCT_STAT sbuf;
3276 NTSTATUS status;
3277 int info;
3278 unsigned int i, j;
3279 SEC_DESC *psd = dup_sec_desc(talloc_tos(), pcsd);
3280 bool is_dacl_protected = (pcsd->type & SE_DESC_DACL_PROTECTED);
3281
3282 ZERO_STRUCT(sbuf);
3283
3284 if (psd == NULL) {
3285 return NT_STATUS_NO_MEMORY;
3286 }
3287
3288 if (!parent_dirname_talloc(mem_ctx,
3289 fsp->fsp_name,
3290 &parent_name,
3291 NULL)) {
3292 return NT_STATUS_NO_MEMORY;
3293 }
3294
3295 status = open_directory(fsp->conn,
3296 NULL,
3297 parent_name,
3298 &sbuf,
3299 FILE_READ_ATTRIBUTES, /* Just a stat open */
3300 FILE_SHARE_NONE, /* Ignored for stat opens */
3301 FILE_OPEN,
3302 0,
3303 INTERNAL_OPEN_ONLY,
3304 &info,
3305 &parent_fsp);
3306
3307 if (!NT_STATUS_IS_OK(status)) {
3308 return status;
3309 }
3310
3311 status = SMB_VFS_GET_NT_ACL(parent_fsp->conn, parent_fsp->fsp_name,
3312 DACL_SECURITY_INFORMATION, &parent_sd );
3313
3314 close_file(parent_fsp, NORMAL_CLOSE);
3315
3316 if (!NT_STATUS_IS_OK(status)) {
3317 return status;
3318 }
3319
3320 /*
3321 * Make room for potentially all the ACLs from
3322 * the parent. We used to add the ugw triple here,
3323 * as we knew we were dealing with POSIX ACLs.
3324 * We no longer need to do so as we can guarentee
3325 * that a default ACL from the parent directory will
3326 * be well formed for POSIX ACLs if it came from a
3327 * POSIX ACL source, and if we're not writing to a
3328 * POSIX ACL sink then we don't care if it's not well
3329 * formed. JRA.
3330 */
3331
3332 num_aces += parent_sd->dacl->num_aces;
3333
3334 if((new_ace = TALLOC_ZERO_ARRAY(mem_ctx, SEC_ACE,
3335 num_aces)) == NULL) {
3336 return NT_STATUS_NO_MEMORY;
3337 }
3338
3339 /* Start by copying in all the given ACE entries. */
3340 for (i = 0; i < psd->dacl->num_aces; i++) {
3341 sec_ace_copy(&new_ace[i], &psd->dacl->aces[i]);
3342 }
3343
3344 /*
3345 * Note that we're ignoring "inherit permissions" here
3346 * as that really only applies to newly created files. JRA.
3347 */
3348
3349 /* Finally append any inherited ACEs. */
3350 for (j = 0; j < parent_sd->dacl->num_aces; j++) {
3351 SEC_ACE *se = &parent_sd->dacl->aces[j];
3352
3353 if (fsp->is_directory) {
3354 if (!(se->flags & SEC_ACE_FLAG_CONTAINER_INHERIT)) {
3355 /* Doesn't apply to a directory - ignore. */
3356 DEBUG(10,("append_parent_acl: directory %s "
3357 "ignoring non container "
3358 "inherit flags %u on ACE with sid %s "
3359 "from parent %s\n",
3360 fsp->fsp_name,
3361 (unsigned int)se->flags,
3362 sid_string_dbg(&se->trustee),
3363 parent_name));
3364 continue;
3365 }
3366 } else {
3367 if (!(se->flags & SEC_ACE_FLAG_OBJECT_INHERIT)) {
3368 /* Doesn't apply to a file - ignore. */
3369 DEBUG(10,("append_parent_acl: file %s "
3370 "ignoring non object "
3371 "inherit flags %u on ACE with sid %s "
3372 "from parent %s\n",
3373 fsp->fsp_name,
3374 (unsigned int)se->flags,
3375 sid_string_dbg(&se->trustee),
3376 parent_name));
3377 continue;
3378 }
3379 }
3380
3381 if (is_dacl_protected) {
3382 /* If the DACL is protected it means we must
3383 * not overwrite an existing ACE entry with the
3384 * same SID. This is order N^2. Ouch :-(. JRA. */
3385 unsigned int k;
3386 for (k = 0; k < psd->dacl->num_aces; k++) {
3387 if (sid_equal(&psd->dacl->aces[k].trustee,
3388 &se->trustee)) {
3389 break;
3390 }
3391 }
3392 if (k < psd->dacl->num_aces) {
3393 /* SID matched. Ignore. */
3394 DEBUG(10,("append_parent_acl: path %s "
3395 "ignoring ACE with protected sid %s "
3396 "from parent %s\n",
3397 fsp->fsp_name,
3398 sid_string_dbg(&se->trustee),
3399 parent_name));
3400 continue;
3401 }
3402 }
3403
3404 sec_ace_copy(&new_ace[i], se);
3405 if (se->flags & SEC_ACE_FLAG_NO_PROPAGATE_INHERIT) {
3406 new_ace[i].flags &= ~(SEC_ACE_FLAG_VALID_INHERIT);
3407 }
3408 new_ace[i].flags |= SEC_ACE_FLAG_INHERITED_ACE;
3409
3410 if (fsp->is_directory) {
3411 /*
3412 * Strip off any inherit only. It's applied.
3413 */
3414 new_ace[i].flags &= ~(SEC_ACE_FLAG_INHERIT_ONLY);
3415 if (se->flags & SEC_ACE_FLAG_NO_PROPAGATE_INHERIT) {
3416 /* No further inheritance. */
3417 new_ace[i].flags &=
3418 ~(SEC_ACE_FLAG_CONTAINER_INHERIT|
3419 SEC_ACE_FLAG_OBJECT_INHERIT);
3420 }
3421 } else {
3422 /*
3423 * Strip off any container or inherit
3424 * flags, they can't apply to objects.
3425 */
3426 new_ace[i].flags &= ~(SEC_ACE_FLAG_CONTAINER_INHERIT|
3427 SEC_ACE_FLAG_INHERIT_ONLY|
3428 SEC_ACE_FLAG_NO_PROPAGATE_INHERIT);
3429 }
3430 i++;
3431
3432 DEBUG(10,("append_parent_acl: path %s "
3433 "inheriting ACE with sid %s "
3434 "from parent %s\n",
3435 fsp->fsp_name,
3436 sid_string_dbg(&se->trustee),
3437 parent_name));
3438 }
3439
3440 psd->dacl->aces = new_ace;
3441 psd->dacl->num_aces = i;
3442 psd->type &= ~(SE_DESC_DACL_AUTO_INHERITED|
3443 SE_DESC_DACL_AUTO_INHERIT_REQ);
3444
3445 *pp_new_sd = psd;
3446 return status;
3447 }
3448 #endif
3449
3450 /****************************************************************************
3451 Reply to set a security descriptor on an fsp. security_info_sent is the
3452 description of the following NT ACL.
3453 This should be the only external function needed for the UNIX style set ACL.
3454 ****************************************************************************/
3455
3456 NTSTATUS set_nt_acl(files_struct *fsp, uint32 security_info_sent, const SEC_DESC *psd)
3457 {
3458 connection_struct *conn = fsp->conn;
3459 uid_t user = (uid_t)-1;
3460 gid_t grp = (gid_t)-1;
3461 SMB_STRUCT_STAT sbuf;
3462 DOM_SID file_owner_sid;
3463 DOM_SID file_grp_sid;
3464 canon_ace *file_ace_list = NULL;
3465 canon_ace *dir_ace_list = NULL;
3466 bool acl_perms = False;
3467 mode_t orig_mode = (mode_t)0;
3468 NTSTATUS status;
3469 bool set_acl_as_root = false;
3470 bool acl_set_support = false;
3471 bool ret = false;
3472
3473 DEBUG(10,("set_nt_acl: called for file %s\n", fsp->fsp_name ));
3474
3475 if (!CAN_WRITE(conn)) {
3476 DEBUG(10,("set acl rejected on read-only share\n"));
3477 return NT_STATUS_MEDIA_WRITE_PROTECTED;
3478 }
3479
3480 /*
3481 * Get the current state of the file.
3482 */
3483
3484 if(fsp->is_directory || fsp->fh->fd == -1) {
3485 if(SMB_VFS_STAT(fsp->conn,fsp->fsp_name, &sbuf) != 0)
3486 return map_nt_error_from_unix(errno);
3487 } else {
3488 if(SMB_VFS_FSTAT(fsp, &sbuf) != 0)
3489 return map_nt_error_from_unix(errno);
3490 }
3491
3492 /* Save the original element we check against. */
3493 orig_mode = sbuf.st_mode;
3494
3495 /*
3496 * Unpack the user/group/world id's.
3497 */
3498
3499 status = unpack_nt_owners( SNUM(conn), &user, &grp, security_info_sent, psd);
3500 if (!NT_STATUS_IS_OK(status)) {
3501 return status;
3502 }
3503
3504 /*
3505 * Do we need to chown ? If so this must be done first as the incoming
3506 * CREATOR_OWNER acl will be relative to the *new* owner, not the old.
3507 * Noticed by Simo.
3508 */
3509
3510 if (((user != (uid_t)-1) && (sbuf.st_uid != user)) || (( grp != (gid_t)-1) && (sbuf.st_gid != grp))) {
3511
3512 DEBUG(3,("set_nt_acl: chown %s. uid = %u, gid = %u.\n",
3513 fsp->fsp_name, (unsigned int)user, (unsigned int)grp ));
3514
3515 if(try_chown( fsp->conn, fsp->fsp_name, user, grp) == -1) {
3516 DEBUG(3,("set_nt_acl: chown %s, %u, %u failed. Error = %s.\n",
3517 fsp->fsp_name, (unsigned int)user, (unsigned int)grp, strerror(errno) ));
3518 if (errno == EPERM) {
3519 return NT_STATUS_INVALID_OWNER;
3520 }
3521 return map_nt_error_from_unix(errno);
3522 }
3523
3524 /*
3525 * Recheck the current state of the file, which may have changed.
3526 * (suid/sgid bits, for instance)
3527 */
3528
3529 if(fsp->is_directory) {
3530 if(SMB_VFS_STAT(fsp->conn, fsp->fsp_name, &sbuf) != 0) {
3531 return map_nt_error_from_unix(errno);
3532 }
3533 } else {
3534
3535 int sret;
3536
3537 if(fsp->fh->fd == -1)
3538 sret = SMB_VFS_STAT(fsp->conn, fsp->fsp_name, &sbuf);
3539 else
3540 sret = SMB_VFS_FSTAT(fsp, &sbuf);
3541
3542 if(sret != 0)
3543 return map_nt_error_from_unix(errno);
3544 }
3545
3546 /* Save the original element we check against. */
3547 orig_mode = sbuf.st_mode;
3548
3549 /* If we successfully chowned, we know we must
3550 * be able to set the acl, so do it as root.
3551 */
3552 set_acl_as_root = true;
3553 }
3554
3555 create_file_sids(&sbuf, &file_owner_sid, &file_grp_sid);
3556
3557 acl_perms = unpack_canon_ace( fsp, &sbuf, &file_owner_sid, &file_grp_sid,
3558 &file_ace_list, &dir_ace_list, security_info_sent, psd);
3559
3560 /* Ignore W2K traverse DACL set. */
3561 if (!file_ace_list && !dir_ace_list) {
3562 return NT_STATUS_OK;
3563 }
3564
3565 if (!acl_perms) {
3566 DEBUG(3,("set_nt_acl: cannot set permissions\n"));
3567 free_canon_ace_list(file_ace_list);
3568 free_canon_ace_list(dir_ace_list);
3569 return NT_STATUS_ACCESS_DENIED;
3570 }
3571
3572 /*
3573 * Only change security if we got a DACL.
3574 */
3575
3576 if(!(security_info_sent & DACL_SECURITY_INFORMATION) || (psd->dacl == NULL)) {
3577 free_canon_ace_list(file_ace_list);
3578 free_canon_ace_list(dir_ace_list);
3579 return NT_STATUS_OK;
3580 }
3581
3582 /*
3583 * Try using the POSIX ACL set first. Fall back to chmod if
3584 * we have no ACL support on this filesystem.
3585 */
3586
3587 if (acl_perms && file_ace_list) {
3588 if (set_acl_as_root) {
3589 become_root();
3590 }
3591 ret = set_canon_ace_list(fsp, file_ace_list, False, sbuf.st_gid, &acl_set_support);
3592 if (set_acl_as_root) {
3593 unbecome_root();
3594 }
3595 if (acl_set_support && ret == false) {
3596 DEBUG(3,("set_nt_acl: failed to set file acl on file %s (%s).\n", fsp->fsp_name, strerror(errno) ));
3597 free_canon_ace_list(file_ace_list);
3598 free_canon_ace_list(dir_ace_list);
3599 return map_nt_error_from_unix(errno);
3600 }
3601 }
3602
3603 if (acl_perms && acl_set_support && fsp->is_directory) {
3604 if (dir_ace_list) {
3605 if (set_acl_as_root) {
3606 become_root();
3607 }
3608 ret = set_canon_ace_list(fsp, dir_ace_list, True, sbuf.st_gid, &acl_set_support);
3609 if (set_acl_as_root) {
3610 unbecome_root();
3611 }
3612 if (ret == false) {
3613 DEBUG(3,("set_nt_acl: failed to set default acl on directory %s (%s).\n", fsp->fsp_name, strerror(errno) ));
3614 free_canon_ace_list(file_ace_list);
3615 free_canon_ace_list(dir_ace_list);
3616 return map_nt_error_from_unix(errno);
3617 }
3618 } else {
3619 int sret = -1;
3620
3621 /*
3622 * No default ACL - delete one if it exists.
3623 */
3624
3625 if (set_acl_as_root) {
3626 become_root();
3627 }
3628 sret = SMB_VFS_SYS_ACL_DELETE_DEF_FILE(conn, fsp->fsp_name);
3629 if (set_acl_as_root) {
3630 unbecome_root();
3631 }
3632 if (sret == -1) {
3633 if (acl_group_override(conn, sbuf.st_gid, fsp->fsp_name)) {
3634 DEBUG(5,("set_nt_acl: acl group control on and "
3635 "current user in file %s primary group. Override delete_def_acl\n",
3636 fsp->fsp_name ));
3637
3638 become_root();
3639 sret = SMB_VFS_SYS_ACL_DELETE_DEF_FILE(conn, fsp->fsp_name);
3640 unbecome_root();
3641 }
3642
3643 if (sret == -1) {
3644 DEBUG(3,("set_nt_acl: sys_acl_delete_def_file failed (%s)\n", strerror(errno)));
3645 free_canon_ace_list(file_ace_list);
3646 free_canon_ace_list(dir_ace_list);
3647 return map_nt_error_from_unix(errno);
3648 }
3649 }
3650 }
3651 }
3652
3653 if (acl_set_support) {
3654 if (set_acl_as_root) {
3655 become_root();
3656 }
3657 store_inheritance_attributes(fsp, file_ace_list, dir_ace_list,
3658 (psd->type & SE_DESC_DACL_PROTECTED) ? True : False);
3659 if (set_acl_as_root) {
3660 unbecome_root();
3661 }
3662 }
3663
3664 /*
3665 * If we cannot set using POSIX ACLs we fall back to checking if we need to chmod.
3666 */
3667
3668 if(!acl_set_support && acl_perms) {
3669 mode_t posix_perms;
3670
3671 if (!convert_canon_ace_to_posix_perms( fsp, file_ace_list, &posix_perms)) {
3672 free_canon_ace_list(file_ace_list);
3673 free_canon_ace_list(dir_ace_list);
3674 DEBUG(3,("set_nt_acl: failed to convert file acl to posix permissions for file %s.\n",
3675 fsp->fsp_name ));
3676 return NT_STATUS_ACCESS_DENIED;
3677 }
3678
3679 if (orig_mode != posix_perms) {
3680 int sret = -1;
3681
3682 DEBUG(3,("set_nt_acl: chmod %s. perms = 0%o.\n",
3683 fsp->fsp_name, (unsigned int)posix_perms ));
3684
3685 if (set_acl_as_root) {
3686 become_root();
3687 }
3688 sret = SMB_VFS_CHMOD(conn,fsp->fsp_name, posix_perms);
3689 if (set_acl_as_root) {
3690 unbecome_root();
3691 }
3692 if(sret == -1) {
3693 if (acl_group_override(conn, sbuf.st_gid, fsp->fsp_name)) {
3694 DEBUG(5,("set_nt_acl: acl group control on and "
3695 "current user in file %s primary group. Override chmod\n",
3696 fsp->fsp_name ));
3697
3698 become_root();
3699 sret = SMB_VFS_CHMOD(conn,fsp->fsp_name, posix_perms);
3700 unbecome_root();
3701 }
3702
3703 if (sret == -1) {
3704 DEBUG(3,("set_nt_acl: chmod %s, 0%o failed. Error = %s.\n",
3705 fsp->fsp_name, (unsigned int)posix_perms, strerror(errno) ));
3706 free_canon_ace_list(file_ace_list);
3707 free_canon_ace_list(dir_ace_list);
3708 return map_nt_error_from_unix(errno);
3709 }
3710 }
3711 }
3712 }
3713
3714 free_canon_ace_list(file_ace_list);
3715 free_canon_ace_list(dir_ace_list);
3716
3717 return NT_STATUS_OK;
3718 }
3719
3720 /****************************************************************************
3721 Get the actual group bits stored on a file with an ACL. Has no effect if
3722 the file has no ACL. Needed in dosmode code where the stat() will return
3723 the mask bits, not the real group bits, for a file with an ACL.
3724 ****************************************************************************/
3725
3726 int get_acl_group_bits( connection_struct *conn, const char *fname, mode_t *mode )
3727 {
3728 int entry_id = SMB_ACL_FIRST_ENTRY;
3729 SMB_ACL_ENTRY_T entry;
3730 SMB_ACL_T posix_acl;
3731 int result = -1;
3732
3733 posix_acl = SMB_VFS_SYS_ACL_GET_FILE(conn, fname, SMB_ACL_TYPE_ACCESS);
3734 if (posix_acl == (SMB_ACL_T)NULL)
3735 return -1;
3736
3737 while (SMB_VFS_SYS_ACL_GET_ENTRY(conn, posix_acl, entry_id, &entry) == 1) {
3738 SMB_ACL_TAG_T tagtype;
3739 SMB_ACL_PERMSET_T permset;
3740
3741 entry_id = SMB_ACL_NEXT_ENTRY;
3742
3743 if (SMB_VFS_SYS_ACL_GET_TAG_TYPE(conn, entry, &tagtype) ==-1)
3744 break;
3745
3746 if (tagtype == SMB_ACL_GROUP_OBJ) {
3747 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, entry, &permset) == -1) {
3748 break;
3749 } else {
3750 *mode &= ~(S_IRGRP|S_IWGRP|S_IXGRP);
3751 *mode |= (SMB_VFS_SYS_ACL_GET_PERM(conn, permset, SMB_ACL_READ) ? S_IRGRP : 0);
3752 *mode |= (SMB_VFS_SYS_ACL_GET_PERM(conn, permset, SMB_ACL_WRITE) ? S_IWGRP : 0);
3753 *mode |= (SMB_VFS_SYS_ACL_GET_PERM(conn, permset, SMB_ACL_EXECUTE) ? S_IXGRP : 0);
3754 result = 0;
3755 break;
3756 }
3757 }
3758 }
3759 SMB_VFS_SYS_ACL_FREE_ACL(conn, posix_acl);
3760 return result;
3761 }
3762
3763 /****************************************************************************
3764 Do a chmod by setting the ACL USER_OBJ, GROUP_OBJ and OTHER bits in an ACL
3765 and set the mask to rwx. Needed to preserve complex ACLs set by NT.
3766 ****************************************************************************/
3767
3768 static int chmod_acl_internals( connection_struct *conn, SMB_ACL_T posix_acl, mode_t mode)
3769 {
3770 int entry_id = SMB_ACL_FIRST_ENTRY;
3771 SMB_ACL_ENTRY_T entry;
3772 int num_entries = 0;
3773
3774 while ( SMB_VFS_SYS_ACL_GET_ENTRY(conn, posix_acl, entry_id, &entry) == 1) {
3775 SMB_ACL_TAG_T tagtype;
3776 SMB_ACL_PERMSET_T permset;
3777 mode_t perms;
3778
3779 entry_id = SMB_ACL_NEXT_ENTRY;
3780
3781 if (SMB_VFS_SYS_ACL_GET_TAG_TYPE(conn, entry, &tagtype) == -1)
3782 return -1;
3783
3784 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, entry, &permset) == -1)
3785 return -1;
3786
3787 num_entries++;
3788
3789 switch(tagtype) {
3790 case SMB_ACL_USER_OBJ:
3791 perms = unix_perms_to_acl_perms(mode, S_IRUSR, S_IWUSR, S_IXUSR);
3792 break;
3793 case SMB_ACL_GROUP_OBJ:
3794 perms = unix_perms_to_acl_perms(mode, S_IRGRP, S_IWGRP, S_IXGRP);
3795 break;
3796 case SMB_ACL_MASK:
3797 /*
3798 * FIXME: The ACL_MASK entry permissions should really be set to
3799 * the union of the permissions of all ACL_USER,
3800 * ACL_GROUP_OBJ, and ACL_GROUP entries. That's what
3801 * acl_calc_mask() does, but Samba ACLs doesn't provide it.
3802 */
3803 perms = S_IRUSR|S_IWUSR|S_IXUSR;
3804 break;
3805 case SMB_ACL_OTHER:
3806 perms = unix_perms_to_acl_perms(mode, S_IROTH, S_IWOTH, S_IXOTH);
3807 break;
3808 default:
3809 continue;
3810 }
3811
3812 if (map_acl_perms_to_permset(conn, perms, &permset) == -1)
3813 return -1;
3814
3815 if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, entry, permset) == -1)
3816 return -1;
3817 }
3818
3819 /*
3820 * If this is a simple 3 element ACL or no elements then it's a standard
3821 * UNIX permission set. Just use chmod...
3822 */
3823
3824 if ((num_entries == 3) || (num_entries == 0))
3825 return -1;
3826
3827 return 0;
3828 }
3829
3830 /****************************************************************************
3831 Get the access ACL of FROM, do a chmod by setting the ACL USER_OBJ,
3832 GROUP_OBJ and OTHER bits in an ACL and set the mask to rwx. Set the
3833 resulting ACL on TO. Note that name is in UNIX character set.
3834 ****************************************************************************/
3835
3836 static int copy_access_posix_acl(connection_struct *conn, const char *from, const char *to, mode_t mode)
3837 {
3838 SMB_ACL_T posix_acl = NULL;
3839 int ret = -1;
3840
3841 if ((posix_acl = SMB_VFS_SYS_ACL_GET_FILE(conn, from, SMB_ACL_TYPE_ACCESS)) == NULL)
3842 return -1;
3843
3844 if ((ret = chmod_acl_internals(conn, posix_acl, mode)) == -1)
3845 goto done;
3846
3847 ret = SMB_VFS_SYS_ACL_SET_FILE(conn, to, SMB_ACL_TYPE_ACCESS, posix_acl);
3848
3849 done:
3850
3851 SMB_VFS_SYS_ACL_FREE_ACL(conn, posix_acl);
3852 return ret;
3853 }
3854
3855 /****************************************************************************
3856 Do a chmod by setting the ACL USER_OBJ, GROUP_OBJ and OTHER bits in an ACL
3857 and set the mask to rwx. Needed to preserve complex ACLs set by NT.
3858 Note that name is in UNIX character set.
3859 ****************************************************************************/
3860
3861 int chmod_acl(connection_struct *conn, const char *name, mode_t mode)
3862 {
3863 return copy_access_posix_acl(conn, name, name, mode);
3864 }
3865
3866 /****************************************************************************
3867 Check for an existing default POSIX ACL on a directory.
3868 ****************************************************************************/
3869
3870 static bool directory_has_default_posix_acl(connection_struct *conn, const char *fname)
3871 {
3872 SMB_ACL_T def_acl = SMB_VFS_SYS_ACL_GET_FILE( conn, fname, SMB_ACL_TYPE_DEFAULT);
3873 bool has_acl = False;
3874 SMB_ACL_ENTRY_T entry;
3875
3876 if (def_acl != NULL && (SMB_VFS_SYS_ACL_GET_ENTRY(conn, def_acl, SMB_ACL_FIRST_ENTRY, &entry) == 1)) {
3877 has_acl = True;
3878 }
3879
3880 if (def_acl) {
3881 SMB_VFS_SYS_ACL_FREE_ACL(conn, def_acl);
3882 }
3883 return has_acl;
3884 }
3885
3886 /****************************************************************************
3887 If the parent directory has no default ACL but it does have an Access ACL,
3888 inherit this Access ACL to file name.
3889 ****************************************************************************/
3890
3891 int inherit_access_posix_acl(connection_struct *conn, const char *inherit_from_dir,
3892 const char *name, mode_t mode)
3893 {
3894 if (directory_has_default_posix_acl(conn, inherit_from_dir))
3895 return 0;
3896
3897 return copy_access_posix_acl(conn, inherit_from_dir, name, mode);
3898 }
3899
3900 /****************************************************************************
3901 Do an fchmod by setting the ACL USER_OBJ, GROUP_OBJ and OTHER bits in an ACL
3902 and set the mask to rwx. Needed to preserve complex ACLs set by NT.
3903 ****************************************************************************/
3904
3905 int fchmod_acl(files_struct *fsp, mode_t mode)
3906 {
3907 connection_struct *conn = fsp->conn;
3908 SMB_ACL_T posix_acl = NULL;
3909 int ret = -1;
3910
3911 if ((posix_acl = SMB_VFS_SYS_ACL_GET_FD(fsp)) == NULL)
3912 return -1;
3913
3914 if ((ret = chmod_acl_internals(conn, posix_acl, mode)) == -1)
3915 goto done;
3916
3917 ret = SMB_VFS_SYS_ACL_SET_FD(fsp, posix_acl);
3918
3919 done:
3920
3921 SMB_VFS_SYS_ACL_FREE_ACL(conn, posix_acl);
3922 return ret;
3923 }
3924
3925 /****************************************************************************
3926 Map from wire type to permset.
3927 ****************************************************************************/
3928
3929 static bool unix_ex_wire_to_permset(connection_struct *conn, unsigned char wire_perm, SMB_ACL_PERMSET_T *p_permset)
3930 {
3931 if (wire_perm & ~(SMB_POSIX_ACL_READ|SMB_POSIX_ACL_WRITE|SMB_POSIX_ACL_EXECUTE)) {
3932 return False;
3933 }
3934
3935 if (SMB_VFS_SYS_ACL_CLEAR_PERMS(conn, *p_permset) == -1) {
3936 return False;
3937 }
3938
3939 if (wire_perm & SMB_POSIX_ACL_READ) {
3940 if (SMB_VFS_SYS_ACL_ADD_PERM(conn, *p_permset, SMB_ACL_READ) == -1) {
3941 return False;
3942 }
3943 }
3944 if (wire_perm & SMB_POSIX_ACL_WRITE) {
3945 if (SMB_VFS_SYS_ACL_ADD_PERM(conn, *p_permset, SMB_ACL_WRITE) == -1) {
3946 return False;
3947 }
3948 }
3949 if (wire_perm & SMB_POSIX_ACL_EXECUTE) {
3950 if (SMB_VFS_SYS_ACL_ADD_PERM(conn, *p_permset, SMB_ACL_EXECUTE) == -1) {
3951 return False;
3952 }
3953 }
3954 return True;
3955 }
3956
3957 /****************************************************************************
3958 Map from wire type to tagtype.
3959 ****************************************************************************/
3960
3961 static bool unix_ex_wire_to_tagtype(unsigned char wire_tt, SMB_ACL_TAG_T *p_tt)
3962 {
3963 switch (wire_tt) {
3964 case SMB_POSIX_ACL_USER_OBJ:
3965 *p_tt = SMB_ACL_USER_OBJ;
3966 break;
3967 case SMB_POSIX_ACL_USER:
3968 *p_tt = SMB_ACL_USER;
3969 break;
3970 case SMB_POSIX_ACL_GROUP_OBJ:
3971 *p_tt = SMB_ACL_GROUP_OBJ;
3972 break;
3973 case SMB_POSIX_ACL_GROUP:
3974 *p_tt = SMB_ACL_GROUP;
3975 break;
3976 case SMB_POSIX_ACL_MASK:
3977 *p_tt = SMB_ACL_MASK;
3978 break;
3979 case SMB_POSIX_ACL_OTHER:
3980 *p_tt = SMB_ACL_OTHER;
3981 break;
3982 default:
3983 return False;
3984 }
3985 return True;
3986 }
3987
3988 /****************************************************************************
3989 Create a new POSIX acl from wire permissions.
3990 FIXME ! How does the share mask/mode fit into this.... ?
3991 ****************************************************************************/
3992
3993 static SMB_ACL_T create_posix_acl_from_wire(connection_struct *conn, uint16 num_acls, const char *pdata)
3994 {
3995 unsigned int i;
3996 SMB_ACL_T the_acl = SMB_VFS_SYS_ACL_INIT(conn, num_acls);
3997
3998 if (the_acl == NULL) {
3999 return NULL;
4000 }
4001
4002 for (i = 0; i < num_acls; i++) {
4003 SMB_ACL_ENTRY_T the_entry;
4004 SMB_ACL_PERMSET_T the_permset;
4005 SMB_ACL_TAG_T tag_type;
4006
4007 if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &the_acl, &the_entry) == -1) {
4008 DEBUG(0,("create_posix_acl_from_wire: Failed to create entry %u. (%s)\n",
4009 i, strerror(errno) ));
4010 goto fail;
4011 }
4012
4013 if (!unix_ex_wire_to_tagtype(CVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)), &tag_type)) {
4014 DEBUG(0,("create_posix_acl_from_wire: invalid wire tagtype %u on entry %u.\n",
4015 CVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)), i ));
4016 goto fail;
4017 }
4018
4019 if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, the_entry, tag_type) == -1) {
4020 DEBUG(0,("create_posix_acl_from_wire: Failed to set tagtype on entry %u. (%s)\n",
4021 i, strerror(errno) ));
4022 goto fail;
4023 }
4024
4025 /* Get the permset pointer from the new ACL entry. */
4026 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, the_entry, &the_permset) == -1) {
4027 DEBUG(0,("create_posix_acl_from_wire: Failed to get permset on entry %u. (%s)\n",
4028 i, strerror(errno) ));
4029 goto fail;
4030 }
4031
4032 /* Map from wire to permissions. */
4033 if (!unix_ex_wire_to_permset(conn, CVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)+1), &the_permset)) {
4034 DEBUG(0,("create_posix_acl_from_wire: invalid permset %u on entry %u.\n",
4035 CVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE) + 1), i ));
4036 goto fail;
4037 }
4038
4039 /* Now apply to the new ACL entry. */
4040 if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, the_entry, the_permset) == -1) {
4041 DEBUG(0,("create_posix_acl_from_wire: Failed to add permset on entry %u. (%s)\n",
4042 i, strerror(errno) ));
4043 goto fail;
4044 }
4045
4046 if (tag_type == SMB_ACL_USER) {
4047 uint32 uidval = IVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)+2);
4048 uid_t uid = (uid_t)uidval;
4049 if (SMB_VFS_SYS_ACL_SET_QUALIFIER(conn, the_entry,(void *)&uid) == -1) {
4050 DEBUG(0,("create_posix_acl_from_wire: Failed to set uid %u on entry %u. (%s)\n",
4051 (unsigned int)uid, i, strerror(errno) ));
4052 goto fail;
4053 }
4054 }
4055
4056 if (tag_type == SMB_ACL_GROUP) {
4057 uint32 gidval = IVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)+2);
4058 gid_t gid = (uid_t)gidval;
4059 if (SMB_VFS_SYS_ACL_SET_QUALIFIER(conn, the_entry,(void *)&gid) == -1) {
4060 DEBUG(0,("create_posix_acl_from_wire: Failed to set gid %u on entry %u. (%s)\n",
4061 (unsigned int)gid, i, strerror(errno) ));
4062 goto fail;
4063 }
4064 }
4065 }
4066
4067 return the_acl;
4068
4069 fail:
4070
4071 if (the_acl != NULL) {
4072 SMB_VFS_SYS_ACL_FREE_ACL(conn, the_acl);
4073 }
4074 return NULL;
4075 }
4076
4077 /****************************************************************************
4078 Calls from UNIX extensions - Default POSIX ACL set.
4079 If num_def_acls == 0 and not a directory just return. If it is a directory
4080 and num_def_acls == 0 then remove the default acl. Else set the default acl
4081 on the directory.
4082 ****************************************************************************/
4083
4084 bool set_unix_posix_default_acl(connection_struct *conn, const char *fname, SMB_STRUCT_STAT *psbuf,
4085 uint16 num_def_acls, const char *pdata)
4086 {
4087 SMB_ACL_T def_acl = NULL;
4088
4089 if (!S_ISDIR(psbuf->st_mode)) {
4090 if (num_def_acls) {
4091 DEBUG(5,("set_unix_posix_default_acl: Can't set default ACL on non-directory file %s\n", fname ));
4092 errno = EISDIR;
4093 return False;
4094 } else {
4095 return True;
4096 }
4097 }
4098
4099 if (!num_def_acls) {
4100 /* Remove the default ACL. */
4101 if (SMB_VFS_SYS_ACL_DELETE_DEF_FILE(conn, fname) == -1) {
4102 DEBUG(5,("set_unix_posix_default_acl: acl_delete_def_file failed on directory %s (%s)\n",
4103 fname, strerror(errno) ));
4104 return False;
4105 }
4106 return True;
4107 }
4108
4109 if ((def_acl = create_posix_acl_from_wire(conn, num_def_acls, pdata)) == NULL) {
4110 return False;
4111 }
4112
4113 if (SMB_VFS_SYS_ACL_SET_FILE(conn, fname, SMB_ACL_TYPE_DEFAULT, def_acl) == -1) {
4114 DEBUG(5,("set_unix_posix_default_acl: acl_set_file failed on directory %s (%s)\n",
4115 fname, strerror(errno) ));
4116 SMB_VFS_SYS_ACL_FREE_ACL(conn, def_acl);
4117 return False;
4118 }
4119
4120 DEBUG(10,("set_unix_posix_default_acl: set default acl for file %s\n", fname ));
4121 SMB_VFS_SYS_ACL_FREE_ACL(conn, def_acl);
4122 return True;
4123 }
4124
4125 /****************************************************************************
4126 Remove an ACL from a file. As we don't have acl_delete_entry() available
4127 we must read the current acl and copy all entries except MASK, USER and GROUP
4128 to a new acl, then set that. This (at least on Linux) causes any ACL to be
4129 removed.
4130 FIXME ! How does the share mask/mode fit into this.... ?
4131 ****************************************************************************/
4132
4133 static bool remove_posix_acl(connection_struct *conn, files_struct *fsp, const char *fname)
4134 {
4135 SMB_ACL_T file_acl = NULL;
4136 int entry_id = SMB_ACL_FIRST_ENTRY;
4137 SMB_ACL_ENTRY_T entry;
4138 bool ret = False;
4139 /* Create a new ACL with only 3 entries, u/g/w. */
4140 SMB_ACL_T new_file_acl = SMB_VFS_SYS_ACL_INIT(conn, 3);
4141 SMB_ACL_ENTRY_T user_ent = NULL;
4142 SMB_ACL_ENTRY_T group_ent = NULL;
4143 SMB_ACL_ENTRY_T other_ent = NULL;
4144
4145 if (new_file_acl == NULL) {
4146 DEBUG(5,("remove_posix_acl: failed to init new ACL with 3 entries for file %s.\n", fname));
4147 return False;
4148 }
4149
4150 /* Now create the u/g/w entries. */
4151 if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &new_file_acl, &user_ent) == -1) {
4152 DEBUG(5,("remove_posix_acl: Failed to create user entry for file %s. (%s)\n",
4153 fname, strerror(errno) ));
4154 goto done;
4155 }
4156 if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, user_ent, SMB_ACL_USER_OBJ) == -1) {
4157 DEBUG(5,("remove_posix_acl: Failed to set user entry for file %s. (%s)\n",
4158 fname, strerror(errno) ));
4159 goto done;
4160 }
4161
4162 if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &new_file_acl, &group_ent) == -1) {
4163 DEBUG(5,("remove_posix_acl: Failed to create group entry for file %s. (%s)\n",
4164 fname, strerror(errno) ));
4165 goto done;
4166 }
4167 if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, group_ent, SMB_ACL_GROUP_OBJ) == -1) {
4168 DEBUG(5,("remove_posix_acl: Failed to set group entry for file %s. (%s)\n",
4169 fname, strerror(errno) ));
4170 goto done;
4171 }
4172
4173 if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &new_file_acl, &other_ent) == -1) {
4174 DEBUG(5,("remove_posix_acl: Failed to create other entry for file %s. (%s)\n",
4175 fname, strerror(errno) ));
4176 goto done;
4177 }
4178 if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, other_ent, SMB_ACL_OTHER) == -1) {
4179 DEBUG(5,("remove_posix_acl: Failed to set other entry for file %s. (%s)\n",
4180 fname, strerror(errno) ));
4181 goto done;
4182 }
4183
4184 /* Get the current file ACL. */
4185 if (fsp && fsp->fh->fd != -1) {
4186 file_acl = SMB_VFS_SYS_ACL_GET_FD(fsp);
4187 } else {
4188 file_acl = SMB_VFS_SYS_ACL_GET_FILE( conn, fname, SMB_ACL_TYPE_ACCESS);
4189 }
4190
4191 if (file_acl == NULL) {
4192 /* This is only returned if an error occurred. Even for a file with
4193 no acl a u/g/w acl should be returned. */
4194 DEBUG(5,("remove_posix_acl: failed to get ACL from file %s (%s).\n",
4195 fname, strerror(errno) ));
4196 goto done;
4197 }
4198
4199 while ( SMB_VFS_SYS_ACL_GET_ENTRY(conn, file_acl, entry_id, &entry) == 1) {
4200 SMB_ACL_TAG_T tagtype;
4201 SMB_ACL_PERMSET_T permset;
4202
4203 entry_id = SMB_ACL_NEXT_ENTRY;
4204
4205 if (SMB_VFS_SYS_ACL_GET_TAG_TYPE(conn, entry, &tagtype) == -1) {
4206 DEBUG(5,("remove_posix_acl: failed to get tagtype from ACL on file %s (%s).\n",
4207 fname, strerror(errno) ));
4208 goto done;
4209 }
4210
4211 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, entry, &permset) == -1) {
4212 DEBUG(5,("remove_posix_acl: failed to get permset from ACL on file %s (%s).\n",
4213 fname, strerror(errno) ));
4214 goto done;
4215 }
4216
4217 if (tagtype == SMB_ACL_USER_OBJ) {
4218 if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, user_ent, permset) == -1) {
4219 DEBUG(5,("remove_posix_acl: failed to set permset from ACL on file %s (%s).\n",
4220 fname, strerror(errno) ));
4221 }
4222 } else if (tagtype == SMB_ACL_GROUP_OBJ) {
4223 if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, group_ent, permset) == -1) {
4224 DEBUG(5,("remove_posix_acl: failed to set permset from ACL on file %s (%s).\n",
4225 fname, strerror(errno) ));
4226 }
4227 } else if (tagtype == SMB_ACL_OTHER) {
4228 if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, other_ent, permset) == -1) {
4229 DEBUG(5,("remove_posix_acl: failed to set permset from ACL on file %s (%s).\n",
4230 fname, strerror(errno) ));
4231 }
4232 }
4233 }
4234
4235 /* Set the new empty file ACL. */
4236 if (fsp && fsp->fh->fd != -1) {
4237 if (SMB_VFS_SYS_ACL_SET_FD(fsp, new_file_acl) == -1) {
4238 DEBUG(5,("remove_posix_acl: acl_set_file failed on %s (%s)\n",
4239 fname, strerror(errno) ));
4240 goto done;
4241 }
4242 } else {
4243 if (SMB_VFS_SYS_ACL_SET_FILE(conn, fname, SMB_ACL_TYPE_ACCESS, new_file_acl) == -1) {
4244 DEBUG(5,("remove_posix_acl: acl_set_file failed on %s (%s)\n",
4245 fname, strerror(errno) ));
4246 goto done;
4247 }
4248 }
4249
4250 ret = True;
4251
4252 done:
4253
4254 if (file_acl) {
4255 SMB_VFS_SYS_ACL_FREE_ACL(conn, file_acl);
4256 }
4257 if (new_file_acl) {
4258 SMB_VFS_SYS_ACL_FREE_ACL(conn, new_file_acl);
4259 }
4260 return ret;
4261 }
4262
4263 /****************************************************************************
4264 Calls from UNIX extensions - POSIX ACL set.
4265 If num_def_acls == 0 then read/modify/write acl after removing all entries
4266 except SMB_ACL_USER_OBJ, SMB_ACL_GROUP_OBJ, SMB_ACL_OTHER.
4267 ****************************************************************************/
4268
4269 bool set_unix_posix_acl(connection_struct *conn, files_struct *fsp, const char *fname, uint16 num_acls, const char *pdata)
4270 {
4271 SMB_ACL_T file_acl = NULL;
4272
4273 if (!num_acls) {
4274 /* Remove the ACL from the file. */
4275 return remove_posix_acl(conn, fsp, fname);
4276 }
4277
4278 if ((file_acl = create_posix_acl_from_wire(conn, num_acls, pdata)) == NULL) {
4279 return False;
4280 }
4281
4282 if (fsp && fsp->fh->fd != -1) {
4283 /* The preferred way - use an open fd. */
4284 if (SMB_VFS_SYS_ACL_SET_FD(fsp, file_acl) == -1) {
4285 DEBUG(5,("set_unix_posix_acl: acl_set_file failed on %s (%s)\n",
4286 fname, strerror(errno) ));
4287 SMB_VFS_SYS_ACL_FREE_ACL(conn, file_acl);
4288 return False;
4289 }
4290 } else {
4291 if (SMB_VFS_SYS_ACL_SET_FILE(conn, fname, SMB_ACL_TYPE_ACCESS, file_acl) == -1) {
4292 DEBUG(5,("set_unix_posix_acl: acl_set_file failed on %s (%s)\n",
4293 fname, strerror(errno) ));
4294 SMB_VFS_SYS_ACL_FREE_ACL(conn, file_acl);
4295 return False;
4296 }
4297 }
4298
4299 DEBUG(10,("set_unix_posix_acl: set acl for file %s\n", fname ));
4300 SMB_VFS_SYS_ACL_FREE_ACL(conn, file_acl);
4301 return True;
4302 }
4303
4304 /********************************************************************
4305 Pull the NT ACL from a file on disk or the OpenEventlog() access
4306 check. Caller is responsible for freeing the returned security
4307 descriptor via TALLOC_FREE(). This is designed for dealing with
4308 user space access checks in smbd outside of the VFS. For example,
4309 checking access rights in OpenEventlog().
4310
4311 Assume we are dealing with files (for now)
4312 ********************************************************************/
4313
4314 SEC_DESC *get_nt_acl_no_snum( TALLOC_CTX *ctx, const char *fname)
4315 {
4316 SEC_DESC *psd, *ret_sd;
4317 connection_struct *conn;
4318 files_struct finfo;
4319 struct fd_handle fh;
4320
4321 conn = TALLOC_ZERO_P(ctx, connection_struct);
4322 if (conn == NULL) {
4323 DEBUG(0, ("talloc failed\n"));
4324 return NULL;
4325 }
4326
4327 if (!(conn->params = TALLOC_P(conn, struct share_params))) {
4328 DEBUG(0,("get_nt_acl_no_snum: talloc() failed!\n"));
4329 TALLOC_FREE(conn);
4330 return NULL;
4331 }
4332
4333 conn->params->service = -1;
4334
4335 set_conn_connectpath(conn, "/");
4336
4337 if (!smbd_vfs_init(conn)) {
4338 DEBUG(0,("get_nt_acl_no_snum: Unable to create a fake connection struct!\n"));
4339 conn_free_internal( conn );
4340 return NULL;
4341 }
4342
4343 ZERO_STRUCT( finfo );
4344 ZERO_STRUCT( fh );
4345
4346 finfo.fnum = -1;
4347 finfo.conn = conn;
4348 finfo.fh = &fh;
4349 finfo.fh->fd = -1;
4350 finfo.fsp_name = CONST_DISCARD(char *,fname);
4351
4352 if (!NT_STATUS_IS_OK(SMB_VFS_FGET_NT_ACL( &finfo, DACL_SECURITY_INFORMATION, &psd))) {
4353 DEBUG(0,("get_nt_acl_no_snum: get_nt_acl returned zero.\n"));
4354 conn_free_internal( conn );
4355 return NULL;
4356 }
4357
4358 ret_sd = dup_sec_desc( ctx, psd );
4359
4360 conn_free_internal( conn );
4361
4362 return ret_sd;
4363 }
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