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s3-lsa: Fix _lsa_LookupNames2() server implementation which always returned a NULL...
[Samba.git] / source / smbd / posix_acls.c
blob1afd48e8624b3121e8883e50bddb43cb31a65491
1 /*
2 Unix SMB/CIFS implementation.
3 SMB NT Security Descriptor / Unix permission conversion.
4 Copyright (C) Jeremy Allison 1994-2000.
5 Copyright (C) Andreas Gruenbacher 2002.
6 Copyright (C) Simo Sorce <idra@samba.org> 2009.
7
8 This program is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 3 of the License, or
11 (at your option) any later version.
12
13 This program is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
17
18 You should have received a copy of the GNU General Public License
19 along with this program. If not, see <http://www.gnu.org/licenses/>.
20 */
21
22 #include "includes.h"
23
24 extern struct current_user current_user;
25 extern const struct generic_mapping file_generic_mapping;
26
27 #undef DBGC_CLASS
28 #define DBGC_CLASS DBGC_ACLS
29
30 /****************************************************************************
31 Data structures representing the internal ACE format.
32 ****************************************************************************/
33
34 enum ace_owner {UID_ACE, GID_ACE, WORLD_ACE};
35 enum ace_attribute {ALLOW_ACE, DENY_ACE}; /* Used for incoming NT ACLS. */
36
37 typedef union posix_id {
38 uid_t uid;
39 gid_t gid;
40 int world;
41 } posix_id;
42
43 typedef struct canon_ace {
44 struct canon_ace *next, *prev;
45 SMB_ACL_TAG_T type;
46 mode_t perms; /* Only use S_I(R|W|X)USR mode bits here. */
47 DOM_SID trustee;
48 enum ace_owner owner_type;
49 enum ace_attribute attr;
50 posix_id unix_ug;
51 bool inherited;
52 } canon_ace;
53
54 #define ALL_ACE_PERMS (S_IRUSR|S_IWUSR|S_IXUSR)
55
56 /*
57 * EA format of user.SAMBA_PAI (Samba_Posix_Acl_Interitance)
58 * attribute on disk.
59 *
60 * | 1 | 1 | 2 | 2 | ....
61 * +------+------+-------------+---------------------+-------------+--------------------+
62 * | vers | flag | num_entries | num_default_entries | ..entries.. | default_entries... |
63 * +------+------+-------------+---------------------+-------------+--------------------+
64 */
65
66 #define PAI_VERSION_OFFSET 0
67 #define PAI_FLAG_OFFSET 1
68 #define PAI_NUM_ENTRIES_OFFSET 2
69 #define PAI_NUM_DEFAULT_ENTRIES_OFFSET 4
70 #define PAI_ENTRIES_BASE 6
71
72 #define PAI_VERSION 1
73 #define PAI_ACL_FLAG_PROTECTED 0x1
74 #define PAI_ENTRY_LENGTH 5
75
76 /*
77 * In memory format of user.SAMBA_PAI attribute.
78 */
79
80 struct pai_entry {
81 struct pai_entry *next, *prev;
82 enum ace_owner owner_type;
83 posix_id unix_ug;
84 };
85
86 struct pai_val {
87 bool pai_protected;
88 unsigned int num_entries;
89 struct pai_entry *entry_list;
90 unsigned int num_def_entries;
91 struct pai_entry *def_entry_list;
92 };
93
94 /************************************************************************
95 Return a uint32 of the pai_entry principal.
96 ************************************************************************/
97
98 static uint32 get_pai_entry_val(struct pai_entry *paie)
99 {
100 switch (paie->owner_type) {
101 case UID_ACE:
102 DEBUG(10,("get_pai_entry_val: uid = %u\n", (unsigned int)paie->unix_ug.uid ));
103 return (uint32)paie->unix_ug.uid;
104 case GID_ACE:
105 DEBUG(10,("get_pai_entry_val: gid = %u\n", (unsigned int)paie->unix_ug.gid ));
106 return (uint32)paie->unix_ug.gid;
107 case WORLD_ACE:
108 default:
109 DEBUG(10,("get_pai_entry_val: world ace\n"));
110 return (uint32)-1;
111 }
112 }
113
114 /************************************************************************
115 Return a uint32 of the entry principal.
116 ************************************************************************/
117
118 static uint32 get_entry_val(canon_ace *ace_entry)
119 {
120 switch (ace_entry->owner_type) {
121 case UID_ACE:
122 DEBUG(10,("get_entry_val: uid = %u\n", (unsigned int)ace_entry->unix_ug.uid ));
123 return (uint32)ace_entry->unix_ug.uid;
124 case GID_ACE:
125 DEBUG(10,("get_entry_val: gid = %u\n", (unsigned int)ace_entry->unix_ug.gid ));
126 return (uint32)ace_entry->unix_ug.gid;
127 case WORLD_ACE:
128 default:
129 DEBUG(10,("get_entry_val: world ace\n"));
130 return (uint32)-1;
131 }
132 }
133
134 /************************************************************************
135 Count the inherited entries.
136 ************************************************************************/
137
138 static unsigned int num_inherited_entries(canon_ace *ace_list)
139 {
140 unsigned int num_entries = 0;
141
142 for (; ace_list; ace_list = ace_list->next)
143 if (ace_list->inherited)
144 num_entries++;
145 return num_entries;
146 }
147
148 /************************************************************************
149 Create the on-disk format. Caller must free.
150 ************************************************************************/
151
152 static char *create_pai_buf(canon_ace *file_ace_list, canon_ace *dir_ace_list, bool pai_protected, size_t *store_size)
153 {
154 char *pai_buf = NULL;
155 canon_ace *ace_list = NULL;
156 char *entry_offset = NULL;
157 unsigned int num_entries = 0;
158 unsigned int num_def_entries = 0;
159
160 for (ace_list = file_ace_list; ace_list; ace_list = ace_list->next)
161 if (ace_list->inherited)
162 num_entries++;
163
164 for (ace_list = dir_ace_list; ace_list; ace_list = ace_list->next)
165 if (ace_list->inherited)
166 num_def_entries++;
167
168 DEBUG(10,("create_pai_buf: num_entries = %u, num_def_entries = %u\n", num_entries, num_def_entries ));
169
170 *store_size = PAI_ENTRIES_BASE + ((num_entries + num_def_entries)*PAI_ENTRY_LENGTH);
171
172 pai_buf = (char *)SMB_MALLOC(*store_size);
173 if (!pai_buf) {
174 return NULL;
175 }
176
177 /* Set up the header. */
178 memset(pai_buf, '\0', PAI_ENTRIES_BASE);
179 SCVAL(pai_buf,PAI_VERSION_OFFSET,PAI_VERSION);
180 SCVAL(pai_buf,PAI_FLAG_OFFSET,(pai_protected ? PAI_ACL_FLAG_PROTECTED : 0));
181 SSVAL(pai_buf,PAI_NUM_ENTRIES_OFFSET,num_entries);
182 SSVAL(pai_buf,PAI_NUM_DEFAULT_ENTRIES_OFFSET,num_def_entries);
183
184 entry_offset = pai_buf + PAI_ENTRIES_BASE;
185
186 for (ace_list = file_ace_list; ace_list; ace_list = ace_list->next) {
187 if (ace_list->inherited) {
188 uint8 type_val = (unsigned char)ace_list->owner_type;
189 uint32 entry_val = get_entry_val(ace_list);
190
191 SCVAL(entry_offset,0,type_val);
192 SIVAL(entry_offset,1,entry_val);
193 entry_offset += PAI_ENTRY_LENGTH;
194 }
195 }
196
197 for (ace_list = dir_ace_list; ace_list; ace_list = ace_list->next) {
198 if (ace_list->inherited) {
199 uint8 type_val = (unsigned char)ace_list->owner_type;
200 uint32 entry_val = get_entry_val(ace_list);
201
202 SCVAL(entry_offset,0,type_val);
203 SIVAL(entry_offset,1,entry_val);
204 entry_offset += PAI_ENTRY_LENGTH;
205 }
206 }
207
208 return pai_buf;
209 }
210
211 /************************************************************************
212 Store the user.SAMBA_PAI attribute on disk.
213 ************************************************************************/
214
215 static void store_inheritance_attributes(files_struct *fsp, canon_ace *file_ace_list,
216 canon_ace *dir_ace_list, bool pai_protected)
217 {
218 int ret;
219 size_t store_size;
220 char *pai_buf;
221
222 if (!lp_map_acl_inherit(SNUM(fsp->conn)))
223 return;
224
225 /*
226 * Don't store if this ACL isn't protected and
227 * none of the entries in it are marked as inherited.
228 */
229
230 if (!pai_protected && num_inherited_entries(file_ace_list) == 0 && num_inherited_entries(dir_ace_list) == 0) {
231 /* Instead just remove the attribute if it exists. */
232 if (fsp->fh->fd != -1)
233 SMB_VFS_FREMOVEXATTR(fsp, SAMBA_POSIX_INHERITANCE_EA_NAME);
234 else
235 SMB_VFS_REMOVEXATTR(fsp->conn, fsp->fsp_name, SAMBA_POSIX_INHERITANCE_EA_NAME);
236 return;
237 }
238
239 pai_buf = create_pai_buf(file_ace_list, dir_ace_list, pai_protected, &store_size);
240
241 if (fsp->fh->fd != -1)
242 ret = SMB_VFS_FSETXATTR(fsp, SAMBA_POSIX_INHERITANCE_EA_NAME,
243 pai_buf, store_size, 0);
244 else
245 ret = SMB_VFS_SETXATTR(fsp->conn,fsp->fsp_name, SAMBA_POSIX_INHERITANCE_EA_NAME,
246 pai_buf, store_size, 0);
247
248 SAFE_FREE(pai_buf);
249
250 DEBUG(10,("store_inheritance_attribute:%s for file %s\n", pai_protected ? " (protected)" : "", fsp->fsp_name));
251 if (ret == -1 && !no_acl_syscall_error(errno))
252 DEBUG(1,("store_inheritance_attribute: Error %s\n", strerror(errno) ));
253 }
254
255 /************************************************************************
256 Delete the in memory inheritance info.
257 ************************************************************************/
258
259 static void free_inherited_info(struct pai_val *pal)
260 {
261 if (pal) {
262 struct pai_entry *paie, *paie_next;
263 for (paie = pal->entry_list; paie; paie = paie_next) {
264 paie_next = paie->next;
265 SAFE_FREE(paie);
266 }
267 for (paie = pal->def_entry_list; paie; paie = paie_next) {
268 paie_next = paie->next;
269 SAFE_FREE(paie);
270 }
271 SAFE_FREE(pal);
272 }
273 }
274
275 /************************************************************************
276 Was this ACL protected ?
277 ************************************************************************/
278
279 static bool get_protected_flag(struct pai_val *pal)
280 {
281 if (!pal)
282 return False;
283 return pal->pai_protected;
284 }
285
286 /************************************************************************
287 Was this ACE inherited ?
288 ************************************************************************/
289
290 static bool get_inherited_flag(struct pai_val *pal, canon_ace *ace_entry, bool default_ace)
291 {
292 struct pai_entry *paie;
293
294 if (!pal)
295 return False;
296
297 /* If the entry exists it is inherited. */
298 for (paie = (default_ace ? pal->def_entry_list : pal->entry_list); paie; paie = paie->next) {
299 if (ace_entry->owner_type == paie->owner_type &&
300 get_entry_val(ace_entry) == get_pai_entry_val(paie))
301 return True;
302 }
303 return False;
304 }
305
306 /************************************************************************
307 Ensure an attribute just read is valid.
308 ************************************************************************/
309
310 static bool check_pai_ok(char *pai_buf, size_t pai_buf_data_size)
311 {
312 uint16 num_entries;
313 uint16 num_def_entries;
314
315 if (pai_buf_data_size < PAI_ENTRIES_BASE) {
316 /* Corrupted - too small. */
317 return False;
318 }
319
320 if (CVAL(pai_buf,PAI_VERSION_OFFSET) != PAI_VERSION)
321 return False;
322
323 num_entries = SVAL(pai_buf,PAI_NUM_ENTRIES_OFFSET);
324 num_def_entries = SVAL(pai_buf,PAI_NUM_DEFAULT_ENTRIES_OFFSET);
325
326 /* Check the entry lists match. */
327 /* Each entry is 5 bytes (type plus 4 bytes of uid or gid). */
328
329 if (((num_entries + num_def_entries)*PAI_ENTRY_LENGTH) + PAI_ENTRIES_BASE != pai_buf_data_size)
330 return False;
331
332 return True;
333 }
334
335
336 /************************************************************************
337 Convert to in-memory format.
338 ************************************************************************/
339
340 static struct pai_val *create_pai_val(char *buf, size_t size)
341 {
342 char *entry_offset;
343 struct pai_val *paiv = NULL;
344 int i;
345
346 if (!check_pai_ok(buf, size))
347 return NULL;
348
349 paiv = SMB_MALLOC_P(struct pai_val);
350 if (!paiv)
351 return NULL;
352
353 memset(paiv, '\0', sizeof(struct pai_val));
354
355 paiv->pai_protected = (CVAL(buf,PAI_FLAG_OFFSET) == PAI_ACL_FLAG_PROTECTED);
356
357 paiv->num_entries = SVAL(buf,PAI_NUM_ENTRIES_OFFSET);
358 paiv->num_def_entries = SVAL(buf,PAI_NUM_DEFAULT_ENTRIES_OFFSET);
359
360 entry_offset = buf + PAI_ENTRIES_BASE;
361
362 DEBUG(10,("create_pai_val:%s num_entries = %u, num_def_entries = %u\n",
363 paiv->pai_protected ? " (pai_protected)" : "", paiv->num_entries, paiv->num_def_entries ));
364
365 for (i = 0; i < paiv->num_entries; i++) {
366 struct pai_entry *paie;
367
368 paie = SMB_MALLOC_P(struct pai_entry);
369 if (!paie) {
370 free_inherited_info(paiv);
371 return NULL;
372 }
373
374 paie->owner_type = (enum ace_owner)CVAL(entry_offset,0);
375 switch( paie->owner_type) {
376 case UID_ACE:
377 paie->unix_ug.uid = (uid_t)IVAL(entry_offset,1);
378 DEBUG(10,("create_pai_val: uid = %u\n", (unsigned int)paie->unix_ug.uid ));
379 break;
380 case GID_ACE:
381 paie->unix_ug.gid = (gid_t)IVAL(entry_offset,1);
382 DEBUG(10,("create_pai_val: gid = %u\n", (unsigned int)paie->unix_ug.gid ));
383 break;
384 case WORLD_ACE:
385 paie->unix_ug.world = -1;
386 DEBUG(10,("create_pai_val: world ace\n"));
387 break;
388 default:
389 free_inherited_info(paiv);
390 return NULL;
391 }
392 entry_offset += PAI_ENTRY_LENGTH;
393 DLIST_ADD(paiv->entry_list, paie);
394 }
395
396 for (i = 0; i < paiv->num_def_entries; i++) {
397 struct pai_entry *paie;
398
399 paie = SMB_MALLOC_P(struct pai_entry);
400 if (!paie) {
401 free_inherited_info(paiv);
402 return NULL;
403 }
404
405 paie->owner_type = (enum ace_owner)CVAL(entry_offset,0);
406 switch( paie->owner_type) {
407 case UID_ACE:
408 paie->unix_ug.uid = (uid_t)IVAL(entry_offset,1);
409 DEBUG(10,("create_pai_val: (def) uid = %u\n", (unsigned int)paie->unix_ug.uid ));
410 break;
411 case GID_ACE:
412 paie->unix_ug.gid = (gid_t)IVAL(entry_offset,1);
413 DEBUG(10,("create_pai_val: (def) gid = %u\n", (unsigned int)paie->unix_ug.gid ));
414 break;
415 case WORLD_ACE:
416 paie->unix_ug.world = -1;
417 DEBUG(10,("create_pai_val: (def) world ace\n"));
418 break;
419 default:
420 free_inherited_info(paiv);
421 return NULL;
422 }
423 entry_offset += PAI_ENTRY_LENGTH;
424 DLIST_ADD(paiv->def_entry_list, paie);
425 }
426
427 return paiv;
428 }
429
430 /************************************************************************
431 Load the user.SAMBA_PAI attribute.
432 ************************************************************************/
433
434 static struct pai_val *fload_inherited_info(files_struct *fsp)
435 {
436 char *pai_buf;
437 size_t pai_buf_size = 1024;
438 struct pai_val *paiv = NULL;
439 ssize_t ret;
440
441 if (!lp_map_acl_inherit(SNUM(fsp->conn)))
442 return NULL;
443
444 if ((pai_buf = (char *)SMB_MALLOC(pai_buf_size)) == NULL)
445 return NULL;
446
447 do {
448 if (fsp->fh->fd != -1)
449 ret = SMB_VFS_FGETXATTR(fsp, SAMBA_POSIX_INHERITANCE_EA_NAME,
450 pai_buf, pai_buf_size);
451 else
452 ret = SMB_VFS_GETXATTR(fsp->conn,fsp->fsp_name,SAMBA_POSIX_INHERITANCE_EA_NAME,
453 pai_buf, pai_buf_size);
454
455 if (ret == -1) {
456 if (errno != ERANGE) {
457 break;
458 }
459 /* Buffer too small - enlarge it. */
460 pai_buf_size *= 2;
461 SAFE_FREE(pai_buf);
462 if (pai_buf_size > 1024*1024) {
463 return NULL; /* Limit malloc to 1mb. */
464 }
465 if ((pai_buf = (char *)SMB_MALLOC(pai_buf_size)) == NULL)
466 return NULL;
467 }
468 } while (ret == -1);
469
470 DEBUG(10,("load_inherited_info: ret = %lu for file %s\n", (unsigned long)ret, fsp->fsp_name));
471
472 if (ret == -1) {
473 /* No attribute or not supported. */
474 #if defined(ENOATTR)
475 if (errno != ENOATTR)
476 DEBUG(10,("load_inherited_info: Error %s\n", strerror(errno) ));
477 #else
478 if (errno != ENOSYS)
479 DEBUG(10,("load_inherited_info: Error %s\n", strerror(errno) ));
480 #endif
481 SAFE_FREE(pai_buf);
482 return NULL;
483 }
484
485 paiv = create_pai_val(pai_buf, ret);
486
487 if (paiv && paiv->pai_protected)
488 DEBUG(10,("load_inherited_info: ACL is protected for file %s\n", fsp->fsp_name));
489
490 SAFE_FREE(pai_buf);
491 return paiv;
492 }
493
494 /************************************************************************
495 Load the user.SAMBA_PAI attribute.
496 ************************************************************************/
497
498 static struct pai_val *load_inherited_info(const struct connection_struct *conn,
499 const char *fname)
500 {
501 char *pai_buf;
502 size_t pai_buf_size = 1024;
503 struct pai_val *paiv = NULL;
504 ssize_t ret;
505
506 if (!lp_map_acl_inherit(SNUM(conn))) {
507 return NULL;
508 }
509
510 if ((pai_buf = (char *)SMB_MALLOC(pai_buf_size)) == NULL) {
511 return NULL;
512 }
513
514 do {
515 ret = SMB_VFS_GETXATTR(conn, fname,
516 SAMBA_POSIX_INHERITANCE_EA_NAME,
517 pai_buf, pai_buf_size);
518
519 if (ret == -1) {
520 if (errno != ERANGE) {
521 break;
522 }
523 /* Buffer too small - enlarge it. */
524 pai_buf_size *= 2;
525 SAFE_FREE(pai_buf);
526 if (pai_buf_size > 1024*1024) {
527 return NULL; /* Limit malloc to 1mb. */
528 }
529 if ((pai_buf = (char *)SMB_MALLOC(pai_buf_size)) == NULL)
530 return NULL;
531 }
532 } while (ret == -1);
533
534 DEBUG(10,("load_inherited_info: ret = %lu for file %s\n", (unsigned long)ret, fname));
535
536 if (ret == -1) {
537 /* No attribute or not supported. */
538 #if defined(ENOATTR)
539 if (errno != ENOATTR)
540 DEBUG(10,("load_inherited_info: Error %s\n", strerror(errno) ));
541 #else
542 if (errno != ENOSYS)
543 DEBUG(10,("load_inherited_info: Error %s\n", strerror(errno) ));
544 #endif
545 SAFE_FREE(pai_buf);
546 return NULL;
547 }
548
549 paiv = create_pai_val(pai_buf, ret);
550
551 if (paiv && paiv->pai_protected) {
552 DEBUG(10,("load_inherited_info: ACL is protected for file %s\n", fname));
553 }
554
555 SAFE_FREE(pai_buf);
556 return paiv;
557 }
558
559 /****************************************************************************
560 Functions to manipulate the internal ACE format.
561 ****************************************************************************/
562
563 /****************************************************************************
564 Count a linked list of canonical ACE entries.
565 ****************************************************************************/
566
567 static size_t count_canon_ace_list( canon_ace *l_head )
568 {
569 size_t count = 0;
570 canon_ace *ace;
571
572 for (ace = l_head; ace; ace = ace->next)
573 count++;
574
575 return count;
576 }
577
578 /****************************************************************************
579 Free a linked list of canonical ACE entries.
580 ****************************************************************************/
581
582 static void free_canon_ace_list( canon_ace *l_head )
583 {
584 canon_ace *list, *next;
585
586 for (list = l_head; list; list = next) {
587 next = list->next;
588 DLIST_REMOVE(l_head, list);
589 SAFE_FREE(list);
590 }
591 }
592
593 /****************************************************************************
594 Function to duplicate a canon_ace entry.
595 ****************************************************************************/
596
597 static canon_ace *dup_canon_ace( canon_ace *src_ace)
598 {
599 canon_ace *dst_ace = SMB_MALLOC_P(canon_ace);
600
601 if (dst_ace == NULL)
602 return NULL;
603
604 *dst_ace = *src_ace;
605 dst_ace->prev = dst_ace->next = NULL;
606 return dst_ace;
607 }
608
609 /****************************************************************************
610 Print out a canon ace.
611 ****************************************************************************/
612
613 static void print_canon_ace(canon_ace *pace, int num)
614 {
615 dbgtext( "canon_ace index %d. Type = %s ", num, pace->attr == ALLOW_ACE ? "allow" : "deny" );
616 dbgtext( "SID = %s ", sid_string_dbg(&pace->trustee));
617 if (pace->owner_type == UID_ACE) {
618 const char *u_name = uidtoname(pace->unix_ug.uid);
619 dbgtext( "uid %u (%s) ", (unsigned int)pace->unix_ug.uid, u_name );
620 } else if (pace->owner_type == GID_ACE) {
621 char *g_name = gidtoname(pace->unix_ug.gid);
622 dbgtext( "gid %u (%s) ", (unsigned int)pace->unix_ug.gid, g_name );
623 } else
624 dbgtext( "other ");
625 switch (pace->type) {
626 case SMB_ACL_USER:
627 dbgtext( "SMB_ACL_USER ");
628 break;
629 case SMB_ACL_USER_OBJ:
630 dbgtext( "SMB_ACL_USER_OBJ ");
631 break;
632 case SMB_ACL_GROUP:
633 dbgtext( "SMB_ACL_GROUP ");
634 break;
635 case SMB_ACL_GROUP_OBJ:
636 dbgtext( "SMB_ACL_GROUP_OBJ ");
637 break;
638 case SMB_ACL_OTHER:
639 dbgtext( "SMB_ACL_OTHER ");
640 break;
641 default:
642 dbgtext( "MASK " );
643 break;
644 }
645 if (pace->inherited)
646 dbgtext( "(inherited) ");
647 dbgtext( "perms ");
648 dbgtext( "%c", pace->perms & S_IRUSR ? 'r' : '-');
649 dbgtext( "%c", pace->perms & S_IWUSR ? 'w' : '-');
650 dbgtext( "%c\n", pace->perms & S_IXUSR ? 'x' : '-');
651 }
652
653 /****************************************************************************
654 Print out a canon ace list.
655 ****************************************************************************/
656
657 static void print_canon_ace_list(const char *name, canon_ace *ace_list)
658 {
659 int count = 0;
660
661 if( DEBUGLVL( 10 )) {
662 dbgtext( "print_canon_ace_list: %s\n", name );
663 for (;ace_list; ace_list = ace_list->next, count++)
664 print_canon_ace(ace_list, count );
665 }
666 }
667
668 /****************************************************************************
669 Map POSIX ACL perms to canon_ace permissions (a mode_t containing only S_(R|W|X)USR bits).
670 ****************************************************************************/
671
672 static mode_t convert_permset_to_mode_t(connection_struct *conn, SMB_ACL_PERMSET_T permset)
673 {
674 mode_t ret = 0;
675
676 ret |= (SMB_VFS_SYS_ACL_GET_PERM(conn, permset, SMB_ACL_READ) ? S_IRUSR : 0);
677 ret |= (SMB_VFS_SYS_ACL_GET_PERM(conn, permset, SMB_ACL_WRITE) ? S_IWUSR : 0);
678 ret |= (SMB_VFS_SYS_ACL_GET_PERM(conn, permset, SMB_ACL_EXECUTE) ? S_IXUSR : 0);
679
680 return ret;
681 }
682
683 /****************************************************************************
684 Map generic UNIX permissions to canon_ace permissions (a mode_t containing only S_(R|W|X)USR bits).
685 ****************************************************************************/
686
687 static mode_t unix_perms_to_acl_perms(mode_t mode, int r_mask, int w_mask, int x_mask)
688 {
689 mode_t ret = 0;
690
691 if (mode & r_mask)
692 ret |= S_IRUSR;
693 if (mode & w_mask)
694 ret |= S_IWUSR;
695 if (mode & x_mask)
696 ret |= S_IXUSR;
697
698 return ret;
699 }
700
701 /****************************************************************************
702 Map canon_ace permissions (a mode_t containing only S_(R|W|X)USR bits) to
703 an SMB_ACL_PERMSET_T.
704 ****************************************************************************/
705
706 static int map_acl_perms_to_permset(connection_struct *conn, mode_t mode, SMB_ACL_PERMSET_T *p_permset)
707 {
708 if (SMB_VFS_SYS_ACL_CLEAR_PERMS(conn, *p_permset) == -1)
709 return -1;
710 if (mode & S_IRUSR) {
711 if (SMB_VFS_SYS_ACL_ADD_PERM(conn, *p_permset, SMB_ACL_READ) == -1)
712 return -1;
713 }
714 if (mode & S_IWUSR) {
715 if (SMB_VFS_SYS_ACL_ADD_PERM(conn, *p_permset, SMB_ACL_WRITE) == -1)
716 return -1;
717 }
718 if (mode & S_IXUSR) {
719 if (SMB_VFS_SYS_ACL_ADD_PERM(conn, *p_permset, SMB_ACL_EXECUTE) == -1)
720 return -1;
721 }
722 return 0;
723 }
724
725 /****************************************************************************
726 Function to create owner and group SIDs from a SMB_STRUCT_STAT.
727 ****************************************************************************/
728
729 void create_file_sids(const SMB_STRUCT_STAT *psbuf, DOM_SID *powner_sid, DOM_SID *pgroup_sid)
730 {
731 uid_to_sid( powner_sid, psbuf->st_uid );
732 gid_to_sid( pgroup_sid, psbuf->st_gid );
733 }
734
735 /****************************************************************************
736 Is the identity in two ACEs equal ? Check both SID and uid/gid.
737 ****************************************************************************/
738
739 static bool identity_in_ace_equal(canon_ace *ace1, canon_ace *ace2)
740 {
741 if (sid_equal(&ace1->trustee, &ace2->trustee)) {
742 return True;
743 }
744 if (ace1->owner_type == ace2->owner_type) {
745 if (ace1->owner_type == UID_ACE &&
746 ace1->unix_ug.uid == ace2->unix_ug.uid) {
747 return True;
748 } else if (ace1->owner_type == GID_ACE &&
749 ace1->unix_ug.gid == ace2->unix_ug.gid) {
750 return True;
751 }
752 }
753 return False;
754 }
755
756 /****************************************************************************
757 Merge aces with a common sid - if both are allow or deny, OR the permissions together and
758 delete the second one. If the first is deny, mask the permissions off and delete the allow
759 if the permissions become zero, delete the deny if the permissions are non zero.
760 ****************************************************************************/
761
762 static void merge_aces( canon_ace **pp_list_head )
763 {
764 canon_ace *l_head = *pp_list_head;
765 canon_ace *curr_ace_outer;
766 canon_ace *curr_ace_outer_next;
767
768 /*
769 * First, merge allow entries with identical SIDs, and deny entries
770 * with identical SIDs.
771 */
772
773 for (curr_ace_outer = l_head; curr_ace_outer; curr_ace_outer = curr_ace_outer_next) {
774 canon_ace *curr_ace;
775 canon_ace *curr_ace_next;
776
777 curr_ace_outer_next = curr_ace_outer->next; /* Save the link in case we delete. */
778
779 for (curr_ace = curr_ace_outer->next; curr_ace; curr_ace = curr_ace_next) {
780
781 curr_ace_next = curr_ace->next; /* Save the link in case of delete. */
782
783 if (identity_in_ace_equal(curr_ace, curr_ace_outer) &&
784 (curr_ace->attr == curr_ace_outer->attr)) {
785
786 if( DEBUGLVL( 10 )) {
787 dbgtext("merge_aces: Merging ACE's\n");
788 print_canon_ace( curr_ace_outer, 0);
789 print_canon_ace( curr_ace, 0);
790 }
791
792 /* Merge two allow or two deny ACE's. */
793
794 curr_ace_outer->perms |= curr_ace->perms;
795 DLIST_REMOVE(l_head, curr_ace);
796 SAFE_FREE(curr_ace);
797 curr_ace_outer_next = curr_ace_outer->next; /* We may have deleted the link. */
798 }
799 }
800 }
801
802 /*
803 * Now go through and mask off allow permissions with deny permissions.
804 * We can delete either the allow or deny here as we know that each SID
805 * appears only once in the list.
806 */
807
808 for (curr_ace_outer = l_head; curr_ace_outer; curr_ace_outer = curr_ace_outer_next) {
809 canon_ace *curr_ace;
810 canon_ace *curr_ace_next;
811
812 curr_ace_outer_next = curr_ace_outer->next; /* Save the link in case we delete. */
813
814 for (curr_ace = curr_ace_outer->next; curr_ace; curr_ace = curr_ace_next) {
815
816 curr_ace_next = curr_ace->next; /* Save the link in case of delete. */
817
818 /*
819 * Subtract ACE's with different entries. Due to the ordering constraints
820 * we've put on the ACL, we know the deny must be the first one.
821 */
822
823 if (identity_in_ace_equal(curr_ace, curr_ace_outer) &&
824 (curr_ace_outer->attr == DENY_ACE) && (curr_ace->attr == ALLOW_ACE)) {
825
826 if( DEBUGLVL( 10 )) {
827 dbgtext("merge_aces: Masking ACE's\n");
828 print_canon_ace( curr_ace_outer, 0);
829 print_canon_ace( curr_ace, 0);
830 }
831
832 curr_ace->perms &= ~curr_ace_outer->perms;
833
834 if (curr_ace->perms == 0) {
835
836 /*
837 * The deny overrides the allow. Remove the allow.
838 */
839
840 DLIST_REMOVE(l_head, curr_ace);
841 SAFE_FREE(curr_ace);
842 curr_ace_outer_next = curr_ace_outer->next; /* We may have deleted the link. */
843
844 } else {
845
846 /*
847 * Even after removing permissions, there
848 * are still allow permissions - delete the deny.
849 * It is safe to delete the deny here,
850 * as we are guarenteed by the deny first
851 * ordering that all the deny entries for
852 * this SID have already been merged into one
853 * before we can get to an allow ace.
854 */
855
856 DLIST_REMOVE(l_head, curr_ace_outer);
857 SAFE_FREE(curr_ace_outer);
858 break;
859 }
860 }
861
862 } /* end for curr_ace */
863 } /* end for curr_ace_outer */
864
865 /* We may have modified the list. */
866
867 *pp_list_head = l_head;
868 }
869
870 /****************************************************************************
871 Check if we need to return NT4.x compatible ACL entries.
872 ****************************************************************************/
873
874 static bool nt4_compatible_acls(void)
875 {
876 int compat = lp_acl_compatibility();
877
878 if (compat == ACL_COMPAT_AUTO) {
879 enum remote_arch_types ra_type = get_remote_arch();
880
881 /* Automatically adapt to client */
882 return (ra_type <= RA_WINNT);
883 } else
884 return (compat == ACL_COMPAT_WINNT);
885 }
886
887
888 /****************************************************************************
889 Map canon_ace perms to permission bits NT.
890 The attr element is not used here - we only process deny entries on set,
891 not get. Deny entries are implicit on get with ace->perms = 0.
892 ****************************************************************************/
893
894 static uint32_t map_canon_ace_perms(int snum,
895 enum security_ace_type *pacl_type,
896 mode_t perms,
897 bool directory_ace)
898 {
899 uint32_t nt_mask = 0;
900
901 *pacl_type = SEC_ACE_TYPE_ACCESS_ALLOWED;
902
903 if (lp_acl_map_full_control(snum) && ((perms & ALL_ACE_PERMS) == ALL_ACE_PERMS)) {
904 if (directory_ace) {
905 nt_mask = UNIX_DIRECTORY_ACCESS_RWX;
906 } else {
907 nt_mask = (UNIX_ACCESS_RWX & ~DELETE_ACCESS);
908 }
909 } else if ((perms & ALL_ACE_PERMS) == (mode_t)0) {
910 /*
911 * Windows NT refuses to display ACEs with no permissions in them (but
912 * they are perfectly legal with Windows 2000). If the ACE has empty
913 * permissions we cannot use 0, so we use the otherwise unused
914 * WRITE_OWNER permission, which we ignore when we set an ACL.
915 * We abstract this into a #define of UNIX_ACCESS_NONE to allow this
916 * to be changed in the future.
917 */
918
919 if (nt4_compatible_acls())
920 nt_mask = UNIX_ACCESS_NONE;
921 else
922 nt_mask = 0;
923 } else {
924 if (directory_ace) {
925 nt_mask |= ((perms & S_IRUSR) ? UNIX_DIRECTORY_ACCESS_R : 0 );
926 nt_mask |= ((perms & S_IWUSR) ? UNIX_DIRECTORY_ACCESS_W : 0 );
927 nt_mask |= ((perms & S_IXUSR) ? UNIX_DIRECTORY_ACCESS_X : 0 );
928 } else {
929 nt_mask |= ((perms & S_IRUSR) ? UNIX_ACCESS_R : 0 );
930 nt_mask |= ((perms & S_IWUSR) ? UNIX_ACCESS_W : 0 );
931 nt_mask |= ((perms & S_IXUSR) ? UNIX_ACCESS_X : 0 );
932 }
933 }
934
935 DEBUG(10,("map_canon_ace_perms: Mapped (UNIX) %x to (NT) %x\n",
936 (unsigned int)perms, (unsigned int)nt_mask ));
937
938 return nt_mask;
939 }
940
941 /****************************************************************************
942 Map NT perms to a UNIX mode_t.
943 ****************************************************************************/
944
945 #define FILE_SPECIFIC_READ_BITS (FILE_READ_DATA|FILE_READ_EA|FILE_READ_ATTRIBUTES)
946 #define FILE_SPECIFIC_WRITE_BITS (FILE_WRITE_DATA|FILE_APPEND_DATA|FILE_WRITE_EA|FILE_WRITE_ATTRIBUTES)
947 #define FILE_SPECIFIC_EXECUTE_BITS (FILE_EXECUTE)
948
949 static mode_t map_nt_perms( uint32 *mask, int type)
950 {
951 mode_t mode = 0;
952
953 switch(type) {
954 case S_IRUSR:
955 if((*mask) & GENERIC_ALL_ACCESS)
956 mode = S_IRUSR|S_IWUSR|S_IXUSR;
957 else {
958 mode |= ((*mask) & (GENERIC_READ_ACCESS|FILE_SPECIFIC_READ_BITS)) ? S_IRUSR : 0;
959 mode |= ((*mask) & (GENERIC_WRITE_ACCESS|FILE_SPECIFIC_WRITE_BITS)) ? S_IWUSR : 0;
960 mode |= ((*mask) & (GENERIC_EXECUTE_ACCESS|FILE_SPECIFIC_EXECUTE_BITS)) ? S_IXUSR : 0;
961 }
962 break;
963 case S_IRGRP:
964 if((*mask) & GENERIC_ALL_ACCESS)
965 mode = S_IRGRP|S_IWGRP|S_IXGRP;
966 else {
967 mode |= ((*mask) & (GENERIC_READ_ACCESS|FILE_SPECIFIC_READ_BITS)) ? S_IRGRP : 0;
968 mode |= ((*mask) & (GENERIC_WRITE_ACCESS|FILE_SPECIFIC_WRITE_BITS)) ? S_IWGRP : 0;
969 mode |= ((*mask) & (GENERIC_EXECUTE_ACCESS|FILE_SPECIFIC_EXECUTE_BITS)) ? S_IXGRP : 0;
970 }
971 break;
972 case S_IROTH:
973 if((*mask) & GENERIC_ALL_ACCESS)
974 mode = S_IROTH|S_IWOTH|S_IXOTH;
975 else {
976 mode |= ((*mask) & (GENERIC_READ_ACCESS|FILE_SPECIFIC_READ_BITS)) ? S_IROTH : 0;
977 mode |= ((*mask) & (GENERIC_WRITE_ACCESS|FILE_SPECIFIC_WRITE_BITS)) ? S_IWOTH : 0;
978 mode |= ((*mask) & (GENERIC_EXECUTE_ACCESS|FILE_SPECIFIC_EXECUTE_BITS)) ? S_IXOTH : 0;
979 }
980 break;
981 }
982
983 return mode;
984 }
985
986 /****************************************************************************
987 Unpack a SEC_DESC into a UNIX owner and group.
988 ****************************************************************************/
989
990 NTSTATUS unpack_nt_owners(int snum, uid_t *puser, gid_t *pgrp, uint32 security_info_sent, const SEC_DESC *psd)
991 {
992 DOM_SID owner_sid;
993 DOM_SID grp_sid;
994
995 *puser = (uid_t)-1;
996 *pgrp = (gid_t)-1;
997
998 if(security_info_sent == 0) {
999 DEBUG(0,("unpack_nt_owners: no security info sent !\n"));
1000 return NT_STATUS_OK;
1001 }
1002
1003 /*
1004 * Validate the owner and group SID's.
1005 */
1006
1007 memset(&owner_sid, '\0', sizeof(owner_sid));
1008 memset(&grp_sid, '\0', sizeof(grp_sid));
1009
1010 DEBUG(5,("unpack_nt_owners: validating owner_sids.\n"));
1011
1012 /*
1013 * Don't immediately fail if the owner sid cannot be validated.
1014 * This may be a group chown only set.
1015 */
1016
1017 if (security_info_sent & OWNER_SECURITY_INFORMATION) {
1018 sid_copy(&owner_sid, psd->owner_sid);
1019 if (!sid_to_uid(&owner_sid, puser)) {
1020 if (lp_force_unknown_acl_user(snum)) {
1021 /* this allows take ownership to work
1022 * reasonably */
1023 *puser = current_user.ut.uid;
1024 } else {
1025 DEBUG(3,("unpack_nt_owners: unable to validate"
1026 " owner sid for %s\n",
1027 sid_string_dbg(&owner_sid)));
1028 return NT_STATUS_INVALID_OWNER;
1029 }
1030 }
1031 DEBUG(3,("unpack_nt_owners: owner sid mapped to uid %u\n",
1032 (unsigned int)*puser ));
1033 }
1034
1035 /*
1036 * Don't immediately fail if the group sid cannot be validated.
1037 * This may be an owner chown only set.
1038 */
1039
1040 if (security_info_sent & GROUP_SECURITY_INFORMATION) {
1041 sid_copy(&grp_sid, psd->group_sid);
1042 if (!sid_to_gid( &grp_sid, pgrp)) {
1043 if (lp_force_unknown_acl_user(snum)) {
1044 /* this allows take group ownership to work
1045 * reasonably */
1046 *pgrp = current_user.ut.gid;
1047 } else {
1048 DEBUG(3,("unpack_nt_owners: unable to validate"
1049 " group sid.\n"));
1050 return NT_STATUS_INVALID_OWNER;
1051 }
1052 }
1053 DEBUG(3,("unpack_nt_owners: group sid mapped to gid %u\n",
1054 (unsigned int)*pgrp));
1055 }
1056
1057 DEBUG(5,("unpack_nt_owners: owner_sids validated.\n"));
1058
1059 return NT_STATUS_OK;
1060 }
1061
1062 /****************************************************************************
1063 Ensure the enforced permissions for this share apply.
1064 ****************************************************************************/
1065
1066 static void apply_default_perms(const struct share_params *params,
1067 const bool is_directory, canon_ace *pace,
1068 mode_t type)
1069 {
1070 mode_t and_bits = (mode_t)0;
1071 mode_t or_bits = (mode_t)0;
1072
1073 /* Get the initial bits to apply. */
1074
1075 if (is_directory) {
1076 and_bits = lp_dir_security_mask(params->service);
1077 or_bits = lp_force_dir_security_mode(params->service);
1078 } else {
1079 and_bits = lp_security_mask(params->service);
1080 or_bits = lp_force_security_mode(params->service);
1081 }
1082
1083 /* Now bounce them into the S_USR space. */
1084 switch(type) {
1085 case S_IRUSR:
1086 /* Ensure owner has read access. */
1087 pace->perms |= S_IRUSR;
1088 if (is_directory)
1089 pace->perms |= (S_IWUSR|S_IXUSR);
1090 and_bits = unix_perms_to_acl_perms(and_bits, S_IRUSR, S_IWUSR, S_IXUSR);
1091 or_bits = unix_perms_to_acl_perms(or_bits, S_IRUSR, S_IWUSR, S_IXUSR);
1092 break;
1093 case S_IRGRP:
1094 and_bits = unix_perms_to_acl_perms(and_bits, S_IRGRP, S_IWGRP, S_IXGRP);
1095 or_bits = unix_perms_to_acl_perms(or_bits, S_IRGRP, S_IWGRP, S_IXGRP);
1096 break;
1097 case S_IROTH:
1098 and_bits = unix_perms_to_acl_perms(and_bits, S_IROTH, S_IWOTH, S_IXOTH);
1099 or_bits = unix_perms_to_acl_perms(or_bits, S_IROTH, S_IWOTH, S_IXOTH);
1100 break;
1101 }
1102
1103 pace->perms = ((pace->perms & and_bits)|or_bits);
1104 }
1105
1106 /****************************************************************************
1107 Check if a given uid/SID is in a group gid/SID. This is probably very
1108 expensive and will need optimisation. A *lot* of optimisation :-). JRA.
1109 ****************************************************************************/
1110
1111 static bool uid_entry_in_group( canon_ace *uid_ace, canon_ace *group_ace )
1112 {
1113 const char *u_name = NULL;
1114
1115 /* "Everyone" always matches every uid. */
1116
1117 if (sid_equal(&group_ace->trustee, &global_sid_World))
1118 return True;
1119
1120 /*
1121 * if it's the current user, we already have the unix token
1122 * and don't need to do the complex user_in_group_sid() call
1123 */
1124 if (uid_ace->unix_ug.uid == current_user.ut.uid) {
1125 size_t i;
1126
1127 if (group_ace->unix_ug.gid == current_user.ut.gid) {
1128 return True;
1129 }
1130
1131 for (i=0; i < current_user.ut.ngroups; i++) {
1132 if (group_ace->unix_ug.gid == current_user.ut.groups[i]) {
1133 return True;
1134 }
1135 }
1136 }
1137
1138 /* u_name talloc'ed off tos. */
1139 u_name = uidtoname(uid_ace->unix_ug.uid);
1140 if (!u_name) {
1141 return False;
1142 }
1143
1144 /* notice that this is not reliable for users exported by winbindd! */
1145 return user_in_group_sid(u_name, &group_ace->trustee);
1146 }
1147
1148 /****************************************************************************
1149 A well formed POSIX file or default ACL has at least 3 entries, a
1150 SMB_ACL_USER_OBJ, SMB_ACL_GROUP_OBJ, SMB_ACL_OTHER_OBJ.
1151 In addition, the owner must always have at least read access.
1152 When using this call on get_acl, the pst struct is valid and contains
1153 the mode of the file. When using this call on set_acl, the pst struct has
1154 been modified to have a mode containing the default for this file or directory
1155 type.
1156 ****************************************************************************/
1157
1158 static bool ensure_canon_entry_valid(canon_ace **pp_ace,
1159 const struct share_params *params,
1160 const bool is_directory,
1161 const DOM_SID *pfile_owner_sid,
1162 const DOM_SID *pfile_grp_sid,
1163 const SMB_STRUCT_STAT *pst,
1164 bool setting_acl)
1165 {
1166 canon_ace *pace;
1167 bool got_user = False;
1168 bool got_grp = False;
1169 bool got_other = False;
1170 canon_ace *pace_other = NULL;
1171
1172 for (pace = *pp_ace; pace; pace = pace->next) {
1173 if (pace->type == SMB_ACL_USER_OBJ) {
1174
1175 if (setting_acl)
1176 apply_default_perms(params, is_directory, pace, S_IRUSR);
1177 got_user = True;
1178
1179 } else if (pace->type == SMB_ACL_GROUP_OBJ) {
1180
1181 /*
1182 * Ensure create mask/force create mode is respected on set.
1183 */
1184
1185 if (setting_acl)
1186 apply_default_perms(params, is_directory, pace, S_IRGRP);
1187 got_grp = True;
1188
1189 } else if (pace->type == SMB_ACL_OTHER) {
1190
1191 /*
1192 * Ensure create mask/force create mode is respected on set.
1193 */
1194
1195 if (setting_acl)
1196 apply_default_perms(params, is_directory, pace, S_IROTH);
1197 got_other = True;
1198 pace_other = pace;
1199 }
1200 }
1201
1202 if (!got_user) {
1203 if ((pace = SMB_MALLOC_P(canon_ace)) == NULL) {
1204 DEBUG(0,("ensure_canon_entry_valid: malloc fail.\n"));
1205 return False;
1206 }
1207
1208 ZERO_STRUCTP(pace);
1209 pace->type = SMB_ACL_USER_OBJ;
1210 pace->owner_type = UID_ACE;
1211 pace->unix_ug.uid = pst->st_uid;
1212 pace->trustee = *pfile_owner_sid;
1213 pace->attr = ALLOW_ACE;
1214
1215 if (setting_acl) {
1216 /* See if the owning user is in any of the other groups in
1217 the ACE. If so, OR in the permissions from that group. */
1218
1219 bool group_matched = False;
1220 canon_ace *pace_iter;
1221
1222 for (pace_iter = *pp_ace; pace_iter; pace_iter = pace_iter->next) {
1223 if (pace_iter->type == SMB_ACL_GROUP_OBJ || pace_iter->type == SMB_ACL_GROUP) {
1224 if (uid_entry_in_group(pace, pace_iter)) {
1225 pace->perms |= pace_iter->perms;
1226 group_matched = True;
1227 }
1228 }
1229 }
1230
1231 /* If we only got an "everyone" perm, just use that. */
1232 if (!group_matched) {
1233 if (got_other)
1234 pace->perms = pace_other->perms;
1235 else
1236 pace->perms = 0;
1237 }
1238
1239 apply_default_perms(params, is_directory, pace, S_IRUSR);
1240 } else {
1241 pace->perms = unix_perms_to_acl_perms(pst->st_mode, S_IRUSR, S_IWUSR, S_IXUSR);
1242 }
1243
1244 DLIST_ADD(*pp_ace, pace);
1245 }
1246
1247 if (!got_grp) {
1248 if ((pace = SMB_MALLOC_P(canon_ace)) == NULL) {
1249 DEBUG(0,("ensure_canon_entry_valid: malloc fail.\n"));
1250 return False;
1251 }
1252
1253 ZERO_STRUCTP(pace);
1254 pace->type = SMB_ACL_GROUP_OBJ;
1255 pace->owner_type = GID_ACE;
1256 pace->unix_ug.uid = pst->st_gid;
1257 pace->trustee = *pfile_grp_sid;
1258 pace->attr = ALLOW_ACE;
1259 if (setting_acl) {
1260 /* If we only got an "everyone" perm, just use that. */
1261 if (got_other)
1262 pace->perms = pace_other->perms;
1263 else
1264 pace->perms = 0;
1265 apply_default_perms(params, is_directory, pace, S_IRGRP);
1266 } else {
1267 pace->perms = unix_perms_to_acl_perms(pst->st_mode, S_IRGRP, S_IWGRP, S_IXGRP);
1268 }
1269
1270 DLIST_ADD(*pp_ace, pace);
1271 }
1272
1273 if (!got_other) {
1274 if ((pace = SMB_MALLOC_P(canon_ace)) == NULL) {
1275 DEBUG(0,("ensure_canon_entry_valid: malloc fail.\n"));
1276 return False;
1277 }
1278
1279 ZERO_STRUCTP(pace);
1280 pace->type = SMB_ACL_OTHER;
1281 pace->owner_type = WORLD_ACE;
1282 pace->unix_ug.world = -1;
1283 pace->trustee = global_sid_World;
1284 pace->attr = ALLOW_ACE;
1285 if (setting_acl) {
1286 pace->perms = 0;
1287 apply_default_perms(params, is_directory, pace, S_IROTH);
1288 } else
1289 pace->perms = unix_perms_to_acl_perms(pst->st_mode, S_IROTH, S_IWOTH, S_IXOTH);
1290
1291 DLIST_ADD(*pp_ace, pace);
1292 }
1293
1294 return True;
1295 }
1296
1297 /****************************************************************************
1298 Check if a POSIX ACL has the required SMB_ACL_USER_OBJ and SMB_ACL_GROUP_OBJ entries.
1299 If it does not have them, check if there are any entries where the trustee is the
1300 file owner or the owning group, and map these to SMB_ACL_USER_OBJ and SMB_ACL_GROUP_OBJ.
1301 ****************************************************************************/
1302
1303 static void check_owning_objs(canon_ace *ace, DOM_SID *pfile_owner_sid, DOM_SID *pfile_grp_sid)
1304 {
1305 bool got_user_obj, got_group_obj;
1306 canon_ace *current_ace;
1307 int i, entries;
1308
1309 entries = count_canon_ace_list(ace);
1310 got_user_obj = False;
1311 got_group_obj = False;
1312
1313 for (i=0, current_ace = ace; i < entries; i++, current_ace = current_ace->next) {
1314 if (current_ace->type == SMB_ACL_USER_OBJ)
1315 got_user_obj = True;
1316 else if (current_ace->type == SMB_ACL_GROUP_OBJ)
1317 got_group_obj = True;
1318 }
1319 if (got_user_obj && got_group_obj) {
1320 DEBUG(10,("check_owning_objs: ACL had owning user/group entries.\n"));
1321 return;
1322 }
1323
1324 for (i=0, current_ace = ace; i < entries; i++, current_ace = current_ace->next) {
1325 if (!got_user_obj && current_ace->owner_type == UID_ACE &&
1326 sid_equal(&current_ace->trustee, pfile_owner_sid)) {
1327 current_ace->type = SMB_ACL_USER_OBJ;
1328 got_user_obj = True;
1329 }
1330 if (!got_group_obj && current_ace->owner_type == GID_ACE &&
1331 sid_equal(&current_ace->trustee, pfile_grp_sid)) {
1332 current_ace->type = SMB_ACL_GROUP_OBJ;
1333 got_group_obj = True;
1334 }
1335 }
1336 if (!got_user_obj)
1337 DEBUG(10,("check_owning_objs: ACL is missing an owner entry.\n"));
1338 if (!got_group_obj)
1339 DEBUG(10,("check_owning_objs: ACL is missing an owning group entry.\n"));
1340 }
1341
1342 /****************************************************************************
1343 Unpack a SEC_DESC into two canonical ace lists.
1344 ****************************************************************************/
1345
1346 static bool create_canon_ace_lists(files_struct *fsp,
1347 SMB_STRUCT_STAT *pst,
1348 DOM_SID *pfile_owner_sid,
1349 DOM_SID *pfile_grp_sid,
1350 canon_ace **ppfile_ace,
1351 canon_ace **ppdir_ace,
1352 const SEC_ACL *dacl)
1353 {
1354 bool all_aces_are_inherit_only = (fsp->is_directory ? True : False);
1355 canon_ace *file_ace = NULL;
1356 canon_ace *dir_ace = NULL;
1357 canon_ace *current_ace = NULL;
1358 bool got_dir_allow = False;
1359 bool got_file_allow = False;
1360 int i, j;
1361
1362 *ppfile_ace = NULL;
1363 *ppdir_ace = NULL;
1364
1365 /*
1366 * Convert the incoming ACL into a more regular form.
1367 */
1368
1369 for(i = 0; i < dacl->num_aces; i++) {
1370 SEC_ACE *psa = &dacl->aces[i];
1371
1372 if((psa->type != SEC_ACE_TYPE_ACCESS_ALLOWED) && (psa->type != SEC_ACE_TYPE_ACCESS_DENIED)) {
1373 DEBUG(3,("create_canon_ace_lists: unable to set anything but an ALLOW or DENY ACE.\n"));
1374 return False;
1375 }
1376
1377 if (nt4_compatible_acls()) {
1378 /*
1379 * The security mask may be UNIX_ACCESS_NONE which should map into
1380 * no permissions (we overload the WRITE_OWNER bit for this) or it
1381 * should be one of the ALL/EXECUTE/READ/WRITE bits. Arrange for this
1382 * to be so. Any other bits override the UNIX_ACCESS_NONE bit.
1383 */
1384
1385 /*
1386 * Convert GENERIC bits to specific bits.
1387 */
1388
1389 se_map_generic(&psa->access_mask, &file_generic_mapping);
1390
1391 psa->access_mask &= (UNIX_ACCESS_NONE|FILE_ALL_ACCESS);
1392
1393 if(psa->access_mask != UNIX_ACCESS_NONE)
1394 psa->access_mask &= ~UNIX_ACCESS_NONE;
1395 }
1396 }
1397
1398 /*
1399 * Deal with the fact that NT 4.x re-writes the canonical format
1400 * that we return for default ACLs. If a directory ACE is identical
1401 * to a inherited directory ACE then NT changes the bits so that the
1402 * first ACE is set to OI|IO and the second ACE for this SID is set
1403 * to CI. We need to repair this. JRA.
1404 */
1405
1406 for(i = 0; i < dacl->num_aces; i++) {
1407 SEC_ACE *psa1 = &dacl->aces[i];
1408
1409 for (j = i + 1; j < dacl->num_aces; j++) {
1410 SEC_ACE *psa2 = &dacl->aces[j];
1411
1412 if (psa1->access_mask != psa2->access_mask)
1413 continue;
1414
1415 if (!sid_equal(&psa1->trustee, &psa2->trustee))
1416 continue;
1417
1418 /*
1419 * Ok - permission bits and SIDs are equal.
1420 * Check if flags were re-written.
1421 */
1422
1423 if (psa1->flags & SEC_ACE_FLAG_INHERIT_ONLY) {
1424
1425 psa1->flags |= (psa2->flags & (SEC_ACE_FLAG_CONTAINER_INHERIT|SEC_ACE_FLAG_OBJECT_INHERIT));
1426 psa2->flags &= ~(SEC_ACE_FLAG_CONTAINER_INHERIT|SEC_ACE_FLAG_OBJECT_INHERIT);
1427
1428 } else if (psa2->flags & SEC_ACE_FLAG_INHERIT_ONLY) {
1429
1430 psa2->flags |= (psa1->flags & (SEC_ACE_FLAG_CONTAINER_INHERIT|SEC_ACE_FLAG_OBJECT_INHERIT));
1431 psa1->flags &= ~(SEC_ACE_FLAG_CONTAINER_INHERIT|SEC_ACE_FLAG_OBJECT_INHERIT);
1432
1433 }
1434 }
1435 }
1436
1437 for(i = 0; i < dacl->num_aces; i++) {
1438 SEC_ACE *psa = &dacl->aces[i];
1439
1440 /*
1441 * Create a cannon_ace entry representing this NT DACL ACE.
1442 */
1443
1444 if ((current_ace = SMB_MALLOC_P(canon_ace)) == NULL) {
1445 free_canon_ace_list(file_ace);
1446 free_canon_ace_list(dir_ace);
1447 DEBUG(0,("create_canon_ace_lists: malloc fail.\n"));
1448 return False;
1449 }
1450
1451 ZERO_STRUCTP(current_ace);
1452
1453 sid_copy(&current_ace->trustee, &psa->trustee);
1454
1455 /*
1456 * Try and work out if the SID is a user or group
1457 * as we need to flag these differently for POSIX.
1458 * Note what kind of a POSIX ACL this should map to.
1459 */
1460
1461 if( sid_equal(&current_ace->trustee, &global_sid_World)) {
1462 current_ace->owner_type = WORLD_ACE;
1463 current_ace->unix_ug.world = -1;
1464 current_ace->type = SMB_ACL_OTHER;
1465 } else if (sid_equal(&current_ace->trustee, &global_sid_Creator_Owner)) {
1466 current_ace->owner_type = UID_ACE;
1467 current_ace->unix_ug.uid = pst->st_uid;
1468 current_ace->type = SMB_ACL_USER_OBJ;
1469
1470 /*
1471 * The Creator Owner entry only specifies inheritable permissions,
1472 * never access permissions. WinNT doesn't always set the ACE to
1473 *INHERIT_ONLY, though.
1474 */
1475
1476 if (nt4_compatible_acls())
1477 psa->flags |= SEC_ACE_FLAG_INHERIT_ONLY;
1478 } else if (sid_equal(&current_ace->trustee, &global_sid_Creator_Group)) {
1479 current_ace->owner_type = GID_ACE;
1480 current_ace->unix_ug.gid = pst->st_gid;
1481 current_ace->type = SMB_ACL_GROUP_OBJ;
1482
1483 /*
1484 * The Creator Group entry only specifies inheritable permissions,
1485 * never access permissions. WinNT doesn't always set the ACE to
1486 *INHERIT_ONLY, though.
1487 */
1488 if (nt4_compatible_acls())
1489 psa->flags |= SEC_ACE_FLAG_INHERIT_ONLY;
1490
1491 } else if (sid_to_uid( &current_ace->trustee, &current_ace->unix_ug.uid)) {
1492 current_ace->owner_type = UID_ACE;
1493 /* If it's the owning user, this is a user_obj, not
1494 * a user. */
1495 if (current_ace->unix_ug.uid == pst->st_uid) {
1496 current_ace->type = SMB_ACL_USER_OBJ;
1497 } else {
1498 current_ace->type = SMB_ACL_USER;
1499 }
1500 } else if (sid_to_gid( &current_ace->trustee, &current_ace->unix_ug.gid)) {
1501 current_ace->owner_type = GID_ACE;
1502 /* If it's the primary group, this is a group_obj, not
1503 * a group. */
1504 if (current_ace->unix_ug.gid == pst->st_gid) {
1505 current_ace->type = SMB_ACL_GROUP_OBJ;
1506 } else {
1507 current_ace->type = SMB_ACL_GROUP;
1508 }
1509 } else {
1510 /*
1511 * Silently ignore map failures in non-mappable SIDs (NT Authority, BUILTIN etc).
1512 */
1513
1514 if (non_mappable_sid(&psa->trustee)) {
1515 DEBUG(10, ("create_canon_ace_lists: ignoring "
1516 "non-mappable SID %s\n",
1517 sid_string_dbg(&psa->trustee)));
1518 SAFE_FREE(current_ace);
1519 continue;
1520 }
1521
1522 free_canon_ace_list(file_ace);
1523 free_canon_ace_list(dir_ace);
1524 DEBUG(0, ("create_canon_ace_lists: unable to map SID "
1525 "%s to uid or gid.\n",
1526 sid_string_dbg(&current_ace->trustee)));
1527 SAFE_FREE(current_ace);
1528 return False;
1529 }
1530
1531 /*
1532 * Map the given NT permissions into a UNIX mode_t containing only
1533 * S_I(R|W|X)USR bits.
1534 */
1535
1536 current_ace->perms |= map_nt_perms( &psa->access_mask, S_IRUSR);
1537 current_ace->attr = (psa->type == SEC_ACE_TYPE_ACCESS_ALLOWED) ? ALLOW_ACE : DENY_ACE;
1538 current_ace->inherited = ((psa->flags & SEC_ACE_FLAG_INHERITED_ACE) ? True : False);
1539
1540 /*
1541 * Now add the created ace to either the file list, the directory
1542 * list, or both. We *MUST* preserve the order here (hence we use
1543 * DLIST_ADD_END) as NT ACLs are order dependent.
1544 */
1545
1546 if (fsp->is_directory) {
1547
1548 /*
1549 * We can only add to the default POSIX ACE list if the ACE is
1550 * designed to be inherited by both files and directories.
1551 */
1552
1553 if ((psa->flags & (SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT)) ==
1554 (SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT)) {
1555
1556 DLIST_ADD_END(dir_ace, current_ace, canon_ace *);
1557
1558 /*
1559 * Note if this was an allow ace. We can't process
1560 * any further deny ace's after this.
1561 */
1562
1563 if (current_ace->attr == ALLOW_ACE)
1564 got_dir_allow = True;
1565
1566 if ((current_ace->attr == DENY_ACE) && got_dir_allow) {
1567 DEBUG(0,("create_canon_ace_lists: malformed ACL in inheritable ACL ! \
1568 Deny entry after Allow entry. Failing to set on file %s.\n", fsp->fsp_name ));
1569 free_canon_ace_list(file_ace);
1570 free_canon_ace_list(dir_ace);
1571 return False;
1572 }
1573
1574 if( DEBUGLVL( 10 )) {
1575 dbgtext("create_canon_ace_lists: adding dir ACL:\n");
1576 print_canon_ace( current_ace, 0);
1577 }
1578
1579 /*
1580 * If this is not an inherit only ACE we need to add a duplicate
1581 * to the file acl.
1582 */
1583
1584 if (!(psa->flags & SEC_ACE_FLAG_INHERIT_ONLY)) {
1585 canon_ace *dup_ace = dup_canon_ace(current_ace);
1586
1587 if (!dup_ace) {
1588 DEBUG(0,("create_canon_ace_lists: malloc fail !\n"));
1589 free_canon_ace_list(file_ace);
1590 free_canon_ace_list(dir_ace);
1591 return False;
1592 }
1593
1594 /*
1595 * We must not free current_ace here as its
1596 * pointer is now owned by the dir_ace list.
1597 */
1598 current_ace = dup_ace;
1599 } else {
1600 /*
1601 * We must not free current_ace here as its
1602 * pointer is now owned by the dir_ace list.
1603 */
1604 current_ace = NULL;
1605 }
1606 }
1607 }
1608
1609 /*
1610 * Only add to the file ACL if not inherit only.
1611 */
1612
1613 if (current_ace && !(psa->flags & SEC_ACE_FLAG_INHERIT_ONLY)) {
1614 DLIST_ADD_END(file_ace, current_ace, canon_ace *);
1615
1616 /*
1617 * Note if this was an allow ace. We can't process
1618 * any further deny ace's after this.
1619 */
1620
1621 if (current_ace->attr == ALLOW_ACE)
1622 got_file_allow = True;
1623
1624 if ((current_ace->attr == DENY_ACE) && got_file_allow) {
1625 DEBUG(0,("create_canon_ace_lists: malformed ACL in file ACL ! \
1626 Deny entry after Allow entry. Failing to set on file %s.\n", fsp->fsp_name ));
1627 free_canon_ace_list(file_ace);
1628 free_canon_ace_list(dir_ace);
1629 return False;
1630 }
1631
1632 if( DEBUGLVL( 10 )) {
1633 dbgtext("create_canon_ace_lists: adding file ACL:\n");
1634 print_canon_ace( current_ace, 0);
1635 }
1636 all_aces_are_inherit_only = False;
1637 /*
1638 * We must not free current_ace here as its
1639 * pointer is now owned by the file_ace list.
1640 */
1641 current_ace = NULL;
1642 }
1643
1644 /*
1645 * Free if ACE was not added.
1646 */
1647
1648 SAFE_FREE(current_ace);
1649 }
1650
1651 if (fsp->is_directory && all_aces_are_inherit_only) {
1652 /*
1653 * Windows 2000 is doing one of these weird 'inherit acl'
1654 * traverses to conserve NTFS ACL resources. Just pretend
1655 * there was no DACL sent. JRA.
1656 */
1657
1658 DEBUG(10,("create_canon_ace_lists: Win2k inherit acl traverse. Ignoring DACL.\n"));
1659 free_canon_ace_list(file_ace);
1660 free_canon_ace_list(dir_ace);
1661 file_ace = NULL;
1662 dir_ace = NULL;
1663 } else {
1664 /*
1665 * Check if we have SMB_ACL_USER_OBJ and SMB_ACL_GROUP_OBJ entries in each
1666 * ACL. If we don't have them, check if any SMB_ACL_USER/SMB_ACL_GROUP
1667 * entries can be converted to *_OBJ. Usually we will already have these
1668 * entries in the Default ACL, and the Access ACL will not have them.
1669 */
1670 if (file_ace) {
1671 check_owning_objs(file_ace, pfile_owner_sid, pfile_grp_sid);
1672 }
1673 if (dir_ace) {
1674 check_owning_objs(dir_ace, pfile_owner_sid, pfile_grp_sid);
1675 }
1676 }
1677
1678 *ppfile_ace = file_ace;
1679 *ppdir_ace = dir_ace;
1680
1681 return True;
1682 }
1683
1684 /****************************************************************************
1685 ASCII art time again... JRA :-).
1686
1687 We have 4 cases to process when moving from an NT ACL to a POSIX ACL. Firstly,
1688 we insist the ACL is in canonical form (ie. all DENY entries preceede ALLOW
1689 entries). Secondly, the merge code has ensured that all duplicate SID entries for
1690 allow or deny have been merged, so the same SID can only appear once in the deny
1691 list or once in the allow list.
1692
1693 We then process as follows :
1694
1695 ---------------------------------------------------------------------------
1696 First pass - look for a Everyone DENY entry.
1697
1698 If it is deny all (rwx) trunate the list at this point.
1699 Else, walk the list from this point and use the deny permissions of this
1700 entry as a mask on all following allow entries. Finally, delete
1701 the Everyone DENY entry (we have applied it to everything possible).
1702
1703 In addition, in this pass we remove any DENY entries that have
1704 no permissions (ie. they are a DENY nothing).
1705 ---------------------------------------------------------------------------
1706 Second pass - only deal with deny user entries.
1707
1708 DENY user1 (perms XXX)
1709
1710 new_perms = 0
1711 for all following allow group entries where user1 is in group
1712 new_perms |= group_perms;
1713
1714 user1 entry perms = new_perms & ~ XXX;
1715
1716 Convert the deny entry to an allow entry with the new perms and
1717 push to the end of the list. Note if the user was in no groups
1718 this maps to a specific allow nothing entry for this user.
1719
1720 The common case from the NT ACL choser (userX deny all) is
1721 optimised so we don't do the group lookup - we just map to
1722 an allow nothing entry.
1723
1724 What we're doing here is inferring the allow permissions the
1725 person setting the ACE on user1 wanted by looking at the allow
1726 permissions on the groups the user is currently in. This will
1727 be a snapshot, depending on group membership but is the best
1728 we can do and has the advantage of failing closed rather than
1729 open.
1730 ---------------------------------------------------------------------------
1731 Third pass - only deal with deny group entries.
1732
1733 DENY group1 (perms XXX)
1734
1735 for all following allow user entries where user is in group1
1736 user entry perms = user entry perms & ~ XXX;
1737
1738 If there is a group Everyone allow entry with permissions YYY,
1739 convert the group1 entry to an allow entry and modify its
1740 permissions to be :
1741
1742 new_perms = YYY & ~ XXX
1743
1744 and push to the end of the list.
1745
1746 If there is no group Everyone allow entry then convert the
1747 group1 entry to a allow nothing entry and push to the end of the list.
1748
1749 Note that the common case from the NT ACL choser (groupX deny all)
1750 cannot be optimised here as we need to modify user entries who are
1751 in the group to change them to a deny all also.
1752
1753 What we're doing here is modifying the allow permissions of
1754 user entries (which are more specific in POSIX ACLs) to mask
1755 out the explicit deny set on the group they are in. This will
1756 be a snapshot depending on current group membership but is the
1757 best we can do and has the advantage of failing closed rather
1758 than open.
1759 ---------------------------------------------------------------------------
1760 Fourth pass - cope with cumulative permissions.
1761
1762 for all allow user entries, if there exists an allow group entry with
1763 more permissive permissions, and the user is in that group, rewrite the
1764 allow user permissions to contain both sets of permissions.
1765
1766 Currently the code for this is #ifdef'ed out as these semantics make
1767 no sense to me. JRA.
1768 ---------------------------------------------------------------------------
1769
1770 Note we *MUST* do the deny user pass first as this will convert deny user
1771 entries into allow user entries which can then be processed by the deny
1772 group pass.
1773
1774 The above algorithm took a *lot* of thinking about - hence this
1775 explaination :-). JRA.
1776 ****************************************************************************/
1777
1778 /****************************************************************************
1779 Process a canon_ace list entries. This is very complex code. We need
1780 to go through and remove the "deny" permissions from any allow entry that matches
1781 the id of this entry. We have already refused any NT ACL that wasn't in correct
1782 order (DENY followed by ALLOW). If any allow entry ends up with zero permissions,
1783 we just remove it (to fail safe). We have already removed any duplicate ace
1784 entries. Treat an "Everyone" DENY_ACE as a special case - use it to mask all
1785 allow entries.
1786 ****************************************************************************/
1787
1788 static void process_deny_list( canon_ace **pp_ace_list )
1789 {
1790 canon_ace *ace_list = *pp_ace_list;
1791 canon_ace *curr_ace = NULL;
1792 canon_ace *curr_ace_next = NULL;
1793
1794 /* Pass 1 above - look for an Everyone, deny entry. */
1795
1796 for (curr_ace = ace_list; curr_ace; curr_ace = curr_ace_next) {
1797 canon_ace *allow_ace_p;
1798
1799 curr_ace_next = curr_ace->next; /* So we can't lose the link. */
1800
1801 if (curr_ace->attr != DENY_ACE)
1802 continue;
1803
1804 if (curr_ace->perms == (mode_t)0) {
1805
1806 /* Deny nothing entry - delete. */
1807
1808 DLIST_REMOVE(ace_list, curr_ace);
1809 continue;
1810 }
1811
1812 if (!sid_equal(&curr_ace->trustee, &global_sid_World))
1813 continue;
1814
1815 /* JRATEST - assert. */
1816 SMB_ASSERT(curr_ace->owner_type == WORLD_ACE);
1817
1818 if (curr_ace->perms == ALL_ACE_PERMS) {
1819
1820 /*
1821 * Optimisation. This is a DENY_ALL to Everyone. Truncate the
1822 * list at this point including this entry.
1823 */
1824
1825 canon_ace *prev_entry = curr_ace->prev;
1826
1827 free_canon_ace_list( curr_ace );
1828 if (prev_entry)
1829 prev_entry->next = NULL;
1830 else {
1831 /* We deleted the entire list. */
1832 ace_list = NULL;
1833 }
1834 break;
1835 }
1836
1837 for (allow_ace_p = curr_ace->next; allow_ace_p; allow_ace_p = allow_ace_p->next) {
1838
1839 /*
1840 * Only mask off allow entries.
1841 */
1842
1843 if (allow_ace_p->attr != ALLOW_ACE)
1844 continue;
1845
1846 allow_ace_p->perms &= ~curr_ace->perms;
1847 }
1848
1849 /*
1850 * Now it's been applied, remove it.
1851 */
1852
1853 DLIST_REMOVE(ace_list, curr_ace);
1854 }
1855
1856 /* Pass 2 above - deal with deny user entries. */
1857
1858 for (curr_ace = ace_list; curr_ace; curr_ace = curr_ace_next) {
1859 mode_t new_perms = (mode_t)0;
1860 canon_ace *allow_ace_p;
1861
1862 curr_ace_next = curr_ace->next; /* So we can't lose the link. */
1863
1864 if (curr_ace->attr != DENY_ACE)
1865 continue;
1866
1867 if (curr_ace->owner_type != UID_ACE)
1868 continue;
1869
1870 if (curr_ace->perms == ALL_ACE_PERMS) {
1871
1872 /*
1873 * Optimisation - this is a deny everything to this user.
1874 * Convert to an allow nothing and push to the end of the list.
1875 */
1876
1877 curr_ace->attr = ALLOW_ACE;
1878 curr_ace->perms = (mode_t)0;
1879 DLIST_DEMOTE(ace_list, curr_ace, canon_ace *);
1880 continue;
1881 }
1882
1883 for (allow_ace_p = curr_ace->next; allow_ace_p; allow_ace_p = allow_ace_p->next) {
1884
1885 if (allow_ace_p->attr != ALLOW_ACE)
1886 continue;
1887
1888 /* We process GID_ACE and WORLD_ACE entries only. */
1889
1890 if (allow_ace_p->owner_type == UID_ACE)
1891 continue;
1892
1893 if (uid_entry_in_group( curr_ace, allow_ace_p))
1894 new_perms |= allow_ace_p->perms;
1895 }
1896
1897 /*
1898 * Convert to a allow entry, modify the perms and push to the end
1899 * of the list.
1900 */
1901
1902 curr_ace->attr = ALLOW_ACE;
1903 curr_ace->perms = (new_perms & ~curr_ace->perms);
1904 DLIST_DEMOTE(ace_list, curr_ace, canon_ace *);
1905 }
1906
1907 /* Pass 3 above - deal with deny group entries. */
1908
1909 for (curr_ace = ace_list; curr_ace; curr_ace = curr_ace_next) {
1910 canon_ace *allow_ace_p;
1911 canon_ace *allow_everyone_p = NULL;
1912
1913 curr_ace_next = curr_ace->next; /* So we can't lose the link. */
1914
1915 if (curr_ace->attr != DENY_ACE)
1916 continue;
1917
1918 if (curr_ace->owner_type != GID_ACE)
1919 continue;
1920
1921 for (allow_ace_p = curr_ace->next; allow_ace_p; allow_ace_p = allow_ace_p->next) {
1922
1923 if (allow_ace_p->attr != ALLOW_ACE)
1924 continue;
1925
1926 /* Store a pointer to the Everyone allow, if it exists. */
1927 if (allow_ace_p->owner_type == WORLD_ACE)
1928 allow_everyone_p = allow_ace_p;
1929
1930 /* We process UID_ACE entries only. */
1931
1932 if (allow_ace_p->owner_type != UID_ACE)
1933 continue;
1934
1935 /* Mask off the deny group perms. */
1936
1937 if (uid_entry_in_group( allow_ace_p, curr_ace))
1938 allow_ace_p->perms &= ~curr_ace->perms;
1939 }
1940
1941 /*
1942 * Convert the deny to an allow with the correct perms and
1943 * push to the end of the list.
1944 */
1945
1946 curr_ace->attr = ALLOW_ACE;
1947 if (allow_everyone_p)
1948 curr_ace->perms = allow_everyone_p->perms & ~curr_ace->perms;
1949 else
1950 curr_ace->perms = (mode_t)0;
1951 DLIST_DEMOTE(ace_list, curr_ace, canon_ace *);
1952 }
1953
1954 /* Doing this fourth pass allows Windows semantics to be layered
1955 * on top of POSIX semantics. I'm not sure if this is desirable.
1956 * For example, in W2K ACLs there is no way to say, "Group X no
1957 * access, user Y full access" if user Y is a member of group X.
1958 * This seems completely broken semantics to me.... JRA.
1959 */
1960
1961 #if 0
1962 /* Pass 4 above - deal with allow entries. */
1963
1964 for (curr_ace = ace_list; curr_ace; curr_ace = curr_ace_next) {
1965 canon_ace *allow_ace_p;
1966
1967 curr_ace_next = curr_ace->next; /* So we can't lose the link. */
1968
1969 if (curr_ace->attr != ALLOW_ACE)
1970 continue;
1971
1972 if (curr_ace->owner_type != UID_ACE)
1973 continue;
1974
1975 for (allow_ace_p = ace_list; allow_ace_p; allow_ace_p = allow_ace_p->next) {
1976
1977 if (allow_ace_p->attr != ALLOW_ACE)
1978 continue;
1979
1980 /* We process GID_ACE entries only. */
1981
1982 if (allow_ace_p->owner_type != GID_ACE)
1983 continue;
1984
1985 /* OR in the group perms. */
1986
1987 if (uid_entry_in_group( curr_ace, allow_ace_p))
1988 curr_ace->perms |= allow_ace_p->perms;
1989 }
1990 }
1991 #endif
1992
1993 *pp_ace_list = ace_list;
1994 }
1995
1996 /****************************************************************************
1997 Create a default mode that will be used if a security descriptor entry has
1998 no user/group/world entries.
1999 ****************************************************************************/
2000
2001 static mode_t create_default_mode(files_struct *fsp, bool interitable_mode)
2002 {
2003 int snum = SNUM(fsp->conn);
2004 mode_t and_bits = (mode_t)0;
2005 mode_t or_bits = (mode_t)0;
2006 mode_t mode = interitable_mode
2007 ? unix_mode( fsp->conn, FILE_ATTRIBUTE_ARCHIVE, fsp->fsp_name,
2008 NULL )
2009 : S_IRUSR;
2010
2011 if (fsp->is_directory)
2012 mode |= (S_IWUSR|S_IXUSR);
2013
2014 /*
2015 * Now AND with the create mode/directory mode bits then OR with the
2016 * force create mode/force directory mode bits.
2017 */
2018
2019 if (fsp->is_directory) {
2020 and_bits = lp_dir_security_mask(snum);
2021 or_bits = lp_force_dir_security_mode(snum);
2022 } else {
2023 and_bits = lp_security_mask(snum);
2024 or_bits = lp_force_security_mode(snum);
2025 }
2026
2027 return ((mode & and_bits)|or_bits);
2028 }
2029
2030 /****************************************************************************
2031 Unpack a SEC_DESC into two canonical ace lists. We don't depend on this
2032 succeeding.
2033 ****************************************************************************/
2034
2035 static bool unpack_canon_ace(files_struct *fsp,
2036 SMB_STRUCT_STAT *pst,
2037 DOM_SID *pfile_owner_sid,
2038 DOM_SID *pfile_grp_sid,
2039 canon_ace **ppfile_ace,
2040 canon_ace **ppdir_ace,
2041 uint32 security_info_sent,
2042 const SEC_DESC *psd)
2043 {
2044 canon_ace *file_ace = NULL;
2045 canon_ace *dir_ace = NULL;
2046
2047 *ppfile_ace = NULL;
2048 *ppdir_ace = NULL;
2049
2050 if(security_info_sent == 0) {
2051 DEBUG(0,("unpack_canon_ace: no security info sent !\n"));
2052 return False;
2053 }
2054
2055 /*
2056 * If no DACL then this is a chown only security descriptor.
2057 */
2058
2059 if(!(security_info_sent & DACL_SECURITY_INFORMATION) || !psd->dacl)
2060 return True;
2061
2062 /*
2063 * Now go through the DACL and create the canon_ace lists.
2064 */
2065
2066 if (!create_canon_ace_lists( fsp, pst, pfile_owner_sid, pfile_grp_sid,
2067 &file_ace, &dir_ace, psd->dacl))
2068 return False;
2069
2070 if ((file_ace == NULL) && (dir_ace == NULL)) {
2071 /* W2K traverse DACL set - ignore. */
2072 return True;
2073 }
2074
2075 /*
2076 * Go through the canon_ace list and merge entries
2077 * belonging to identical users of identical allow or deny type.
2078 * We can do this as all deny entries come first, followed by
2079 * all allow entries (we have mandated this before accepting this acl).
2080 */
2081
2082 print_canon_ace_list( "file ace - before merge", file_ace);
2083 merge_aces( &file_ace );
2084
2085 print_canon_ace_list( "dir ace - before merge", dir_ace);
2086 merge_aces( &dir_ace );
2087
2088 /*
2089 * NT ACLs are order dependent. Go through the acl lists and
2090 * process DENY entries by masking the allow entries.
2091 */
2092
2093 print_canon_ace_list( "file ace - before deny", file_ace);
2094 process_deny_list( &file_ace);
2095
2096 print_canon_ace_list( "dir ace - before deny", dir_ace);
2097 process_deny_list( &dir_ace);
2098
2099 /*
2100 * A well formed POSIX file or default ACL has at least 3 entries, a
2101 * SMB_ACL_USER_OBJ, SMB_ACL_GROUP_OBJ, SMB_ACL_OTHER_OBJ
2102 * and optionally a mask entry. Ensure this is the case.
2103 */
2104
2105 print_canon_ace_list( "file ace - before valid", file_ace);
2106
2107 /*
2108 * A default 3 element mode entry for a file should be r-- --- ---.
2109 * A default 3 element mode entry for a directory should be rwx --- ---.
2110 */
2111
2112 pst->st_mode = create_default_mode(fsp, False);
2113
2114 if (!ensure_canon_entry_valid(&file_ace, fsp->conn->params, fsp->is_directory, pfile_owner_sid, pfile_grp_sid, pst, True)) {
2115 free_canon_ace_list(file_ace);
2116 free_canon_ace_list(dir_ace);
2117 return False;
2118 }
2119
2120 print_canon_ace_list( "dir ace - before valid", dir_ace);
2121
2122 /*
2123 * A default inheritable 3 element mode entry for a directory should be the
2124 * mode Samba will use to create a file within. Ensure user rwx bits are set if
2125 * it's a directory.
2126 */
2127
2128 pst->st_mode = create_default_mode(fsp, True);
2129
2130 if (dir_ace && !ensure_canon_entry_valid(&dir_ace, fsp->conn->params, fsp->is_directory, pfile_owner_sid, pfile_grp_sid, pst, True)) {
2131 free_canon_ace_list(file_ace);
2132 free_canon_ace_list(dir_ace);
2133 return False;
2134 }
2135
2136 print_canon_ace_list( "file ace - return", file_ace);
2137 print_canon_ace_list( "dir ace - return", dir_ace);
2138
2139 *ppfile_ace = file_ace;
2140 *ppdir_ace = dir_ace;
2141 return True;
2142
2143 }
2144
2145 /******************************************************************************
2146 When returning permissions, try and fit NT display
2147 semantics if possible. Note the the canon_entries here must have been malloced.
2148 The list format should be - first entry = owner, followed by group and other user
2149 entries, last entry = other.
2150
2151 Note that this doesn't exactly match the NT semantics for an ACL. As POSIX entries
2152 are not ordered, and match on the most specific entry rather than walking a list,
2153 then a simple POSIX permission of rw-r--r-- should really map to 5 entries,
2154
2155 Entry 0: owner : deny all except read and write.
2156 Entry 1: owner : allow read and write.
2157 Entry 2: group : deny all except read.
2158 Entry 3: group : allow read.
2159 Entry 4: Everyone : allow read.
2160
2161 But NT cannot display this in their ACL editor !
2162 ********************************************************************************/
2163
2164 static void arrange_posix_perms(const char *filename, canon_ace **pp_list_head)
2165 {
2166 canon_ace *l_head = *pp_list_head;
2167 canon_ace *owner_ace = NULL;
2168 canon_ace *other_ace = NULL;
2169 canon_ace *ace = NULL;
2170
2171 for (ace = l_head; ace; ace = ace->next) {
2172 if (ace->type == SMB_ACL_USER_OBJ)
2173 owner_ace = ace;
2174 else if (ace->type == SMB_ACL_OTHER) {
2175 /* Last ace - this is "other" */
2176 other_ace = ace;
2177 }
2178 }
2179
2180 if (!owner_ace || !other_ace) {
2181 DEBUG(0,("arrange_posix_perms: Invalid POSIX permissions for file %s, missing owner or other.\n",
2182 filename ));
2183 return;
2184 }
2185
2186 /*
2187 * The POSIX algorithm applies to owner first, and other last,
2188 * so ensure they are arranged in this order.
2189 */
2190
2191 if (owner_ace) {
2192 DLIST_PROMOTE(l_head, owner_ace);
2193 }
2194
2195 if (other_ace) {
2196 DLIST_DEMOTE(l_head, other_ace, canon_ace *);
2197 }
2198
2199 /* We have probably changed the head of the list. */
2200
2201 *pp_list_head = l_head;
2202 }
2203
2204 /****************************************************************************
2205 Create a linked list of canonical ACE entries.
2206 ****************************************************************************/
2207
2208 static canon_ace *canonicalise_acl(struct connection_struct *conn,
2209 const char *fname, SMB_ACL_T posix_acl,
2210 const SMB_STRUCT_STAT *psbuf,
2211 const DOM_SID *powner, const DOM_SID *pgroup, struct pai_val *pal, SMB_ACL_TYPE_T the_acl_type)
2212 {
2213 mode_t acl_mask = (S_IRUSR|S_IWUSR|S_IXUSR);
2214 canon_ace *l_head = NULL;
2215 canon_ace *ace = NULL;
2216 canon_ace *next_ace = NULL;
2217 int entry_id = SMB_ACL_FIRST_ENTRY;
2218 SMB_ACL_ENTRY_T entry;
2219 size_t ace_count;
2220
2221 while ( posix_acl && (SMB_VFS_SYS_ACL_GET_ENTRY(conn, posix_acl, entry_id, &entry) == 1)) {
2222 SMB_ACL_TAG_T tagtype;
2223 SMB_ACL_PERMSET_T permset;
2224 DOM_SID sid;
2225 posix_id unix_ug;
2226 enum ace_owner owner_type;
2227
2228 entry_id = SMB_ACL_NEXT_ENTRY;
2229
2230 /* Is this a MASK entry ? */
2231 if (SMB_VFS_SYS_ACL_GET_TAG_TYPE(conn, entry, &tagtype) == -1)
2232 continue;
2233
2234 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, entry, &permset) == -1)
2235 continue;
2236
2237 /* Decide which SID to use based on the ACL type. */
2238 switch(tagtype) {
2239 case SMB_ACL_USER_OBJ:
2240 /* Get the SID from the owner. */
2241 sid_copy(&sid, powner);
2242 unix_ug.uid = psbuf->st_uid;
2243 owner_type = UID_ACE;
2244 break;
2245 case SMB_ACL_USER:
2246 {
2247 uid_t *puid = (uid_t *)SMB_VFS_SYS_ACL_GET_QUALIFIER(conn, entry);
2248 if (puid == NULL) {
2249 DEBUG(0,("canonicalise_acl: Failed to get uid.\n"));
2250 continue;
2251 }
2252 /*
2253 * A SMB_ACL_USER entry for the owner is shadowed by the
2254 * SMB_ACL_USER_OBJ entry and Windows also cannot represent
2255 * that entry, so we ignore it. We also don't create such
2256 * entries out of the blue when setting ACLs, so a get/set
2257 * cycle will drop them.
2258 */
2259 if (the_acl_type == SMB_ACL_TYPE_ACCESS && *puid == psbuf->st_uid) {
2260 SMB_VFS_SYS_ACL_FREE_QUALIFIER(conn, (void *)puid,tagtype);
2261 continue;
2262 }
2263 uid_to_sid( &sid, *puid);
2264 unix_ug.uid = *puid;
2265 owner_type = UID_ACE;
2266 SMB_VFS_SYS_ACL_FREE_QUALIFIER(conn, (void *)puid,tagtype);
2267 break;
2268 }
2269 case SMB_ACL_GROUP_OBJ:
2270 /* Get the SID from the owning group. */
2271 sid_copy(&sid, pgroup);
2272 unix_ug.gid = psbuf->st_gid;
2273 owner_type = GID_ACE;
2274 break;
2275 case SMB_ACL_GROUP:
2276 {
2277 gid_t *pgid = (gid_t *)SMB_VFS_SYS_ACL_GET_QUALIFIER(conn, entry);
2278 if (pgid == NULL) {
2279 DEBUG(0,("canonicalise_acl: Failed to get gid.\n"));
2280 continue;
2281 }
2282 gid_to_sid( &sid, *pgid);
2283 unix_ug.gid = *pgid;
2284 owner_type = GID_ACE;
2285 SMB_VFS_SYS_ACL_FREE_QUALIFIER(conn, (void *)pgid,tagtype);
2286 break;
2287 }
2288 case SMB_ACL_MASK:
2289 acl_mask = convert_permset_to_mode_t(conn, permset);
2290 continue; /* Don't count the mask as an entry. */
2291 case SMB_ACL_OTHER:
2292 /* Use the Everyone SID */
2293 sid = global_sid_World;
2294 unix_ug.world = -1;
2295 owner_type = WORLD_ACE;
2296 break;
2297 default:
2298 DEBUG(0,("canonicalise_acl: Unknown tagtype %u\n", (unsigned int)tagtype));
2299 continue;
2300 }
2301
2302 /*
2303 * Add this entry to the list.
2304 */
2305
2306 if ((ace = SMB_MALLOC_P(canon_ace)) == NULL)
2307 goto fail;
2308
2309 ZERO_STRUCTP(ace);
2310 ace->type = tagtype;
2311 ace->perms = convert_permset_to_mode_t(conn, permset);
2312 ace->attr = ALLOW_ACE;
2313 ace->trustee = sid;
2314 ace->unix_ug = unix_ug;
2315 ace->owner_type = owner_type;
2316 ace->inherited = get_inherited_flag(pal, ace, (the_acl_type == SMB_ACL_TYPE_DEFAULT));
2317
2318 DLIST_ADD(l_head, ace);
2319 }
2320
2321 /*
2322 * This next call will ensure we have at least a user/group/world set.
2323 */
2324
2325 if (!ensure_canon_entry_valid(&l_head, conn->params,
2326 S_ISDIR(psbuf->st_mode), powner, pgroup,
2327 psbuf, False))
2328 goto fail;
2329
2330 /*
2331 * Now go through the list, masking the permissions with the
2332 * acl_mask. Ensure all DENY Entries are at the start of the list.
2333 */
2334
2335 DEBUG(10,("canonicalise_acl: %s ace entries before arrange :\n", the_acl_type == SMB_ACL_TYPE_ACCESS ? "Access" : "Default" ));
2336
2337 for ( ace_count = 0, ace = l_head; ace; ace = next_ace, ace_count++) {
2338 next_ace = ace->next;
2339
2340 /* Masks are only applied to entries other than USER_OBJ and OTHER. */
2341 if (ace->type != SMB_ACL_OTHER && ace->type != SMB_ACL_USER_OBJ)
2342 ace->perms &= acl_mask;
2343
2344 if (ace->perms == 0) {
2345 DLIST_PROMOTE(l_head, ace);
2346 }
2347
2348 if( DEBUGLVL( 10 ) ) {
2349 print_canon_ace(ace, ace_count);
2350 }
2351 }
2352
2353 arrange_posix_perms(fname,&l_head );
2354
2355 print_canon_ace_list( "canonicalise_acl: ace entries after arrange", l_head );
2356
2357 return l_head;
2358
2359 fail:
2360
2361 free_canon_ace_list(l_head);
2362 return NULL;
2363 }
2364
2365 /****************************************************************************
2366 Check if the current user group list contains a given group.
2367 ****************************************************************************/
2368
2369 static bool current_user_in_group(gid_t gid)
2370 {
2371 int i;
2372
2373 for (i = 0; i < current_user.ut.ngroups; i++) {
2374 if (current_user.ut.groups[i] == gid) {
2375 return True;
2376 }
2377 }
2378
2379 return False;
2380 }
2381
2382 /****************************************************************************
2383 Should we override a deny ? Check 'acl group control' and 'dos filemode'.
2384 ****************************************************************************/
2385
2386 static bool acl_group_override(connection_struct *conn,
2387 SMB_STRUCT_STAT *psbuf,
2388 const char *fname)
2389 {
2390 if ((errno != EPERM) && (errno != EACCES)) {
2391 return false;
2392 }
2393
2394 /* file primary group == user primary or supplementary group */
2395 if (lp_acl_group_control(SNUM(conn)) &&
2396 current_user_in_group(psbuf->st_gid)) {
2397 return true;
2398 }
2399
2400 /* user has writeable permission */
2401 if (lp_dos_filemode(SNUM(conn)) &&
2402 can_write_to_file(conn, fname, psbuf)) {
2403 return true;
2404 }
2405
2406 return false;
2407 }
2408
2409 /****************************************************************************
2410 Attempt to apply an ACL to a file or directory.
2411 ****************************************************************************/
2412
2413 static bool set_canon_ace_list(files_struct *fsp, canon_ace *the_ace, bool default_ace, SMB_STRUCT_STAT *psbuf, bool *pacl_set_support)
2414 {
2415 connection_struct *conn = fsp->conn;
2416 bool ret = False;
2417 SMB_ACL_T the_acl = SMB_VFS_SYS_ACL_INIT(conn, (int)count_canon_ace_list(the_ace) + 1);
2418 canon_ace *p_ace;
2419 int i;
2420 SMB_ACL_ENTRY_T mask_entry;
2421 bool got_mask_entry = False;
2422 SMB_ACL_PERMSET_T mask_permset;
2423 SMB_ACL_TYPE_T the_acl_type = (default_ace ? SMB_ACL_TYPE_DEFAULT : SMB_ACL_TYPE_ACCESS);
2424 bool needs_mask = False;
2425 mode_t mask_perms = 0;
2426
2427 #if defined(POSIX_ACL_NEEDS_MASK)
2428 /* HP-UX always wants to have a mask (called "class" there). */
2429 needs_mask = True;
2430 #endif
2431
2432 if (the_acl == NULL) {
2433
2434 if (!no_acl_syscall_error(errno)) {
2435 /*
2436 * Only print this error message if we have some kind of ACL
2437 * support that's not working. Otherwise we would always get this.
2438 */
2439 DEBUG(0,("set_canon_ace_list: Unable to init %s ACL. (%s)\n",
2440 default_ace ? "default" : "file", strerror(errno) ));
2441 }
2442 *pacl_set_support = False;
2443 return False;
2444 }
2445
2446 if( DEBUGLVL( 10 )) {
2447 dbgtext("set_canon_ace_list: setting ACL:\n");
2448 for (i = 0, p_ace = the_ace; p_ace; p_ace = p_ace->next, i++ ) {
2449 print_canon_ace( p_ace, i);
2450 }
2451 }
2452
2453 for (i = 0, p_ace = the_ace; p_ace; p_ace = p_ace->next, i++ ) {
2454 SMB_ACL_ENTRY_T the_entry;
2455 SMB_ACL_PERMSET_T the_permset;
2456
2457 /*
2458 * ACLs only "need" an ACL_MASK entry if there are any named user or
2459 * named group entries. But if there is an ACL_MASK entry, it applies
2460 * to ACL_USER, ACL_GROUP, and ACL_GROUP_OBJ entries. Set the mask
2461 * so that it doesn't deny (i.e., mask off) any permissions.
2462 */
2463
2464 if (p_ace->type == SMB_ACL_USER || p_ace->type == SMB_ACL_GROUP) {
2465 needs_mask = True;
2466 mask_perms |= p_ace->perms;
2467 } else if (p_ace->type == SMB_ACL_GROUP_OBJ) {
2468 mask_perms |= p_ace->perms;
2469 }
2470
2471 /*
2472 * Get the entry for this ACE.
2473 */
2474
2475 if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &the_acl, &the_entry) == -1) {
2476 DEBUG(0,("set_canon_ace_list: Failed to create entry %d. (%s)\n",
2477 i, strerror(errno) ));
2478 goto fail;
2479 }
2480
2481 if (p_ace->type == SMB_ACL_MASK) {
2482 mask_entry = the_entry;
2483 got_mask_entry = True;
2484 }
2485
2486 /*
2487 * Ok - we now know the ACL calls should be working, don't
2488 * allow fallback to chmod.
2489 */
2490
2491 *pacl_set_support = True;
2492
2493 /*
2494 * Initialise the entry from the canon_ace.
2495 */
2496
2497 /*
2498 * First tell the entry what type of ACE this is.
2499 */
2500
2501 if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, the_entry, p_ace->type) == -1) {
2502 DEBUG(0,("set_canon_ace_list: Failed to set tag type on entry %d. (%s)\n",
2503 i, strerror(errno) ));
2504 goto fail;
2505 }
2506
2507 /*
2508 * Only set the qualifier (user or group id) if the entry is a user
2509 * or group id ACE.
2510 */
2511
2512 if ((p_ace->type == SMB_ACL_USER) || (p_ace->type == SMB_ACL_GROUP)) {
2513 if (SMB_VFS_SYS_ACL_SET_QUALIFIER(conn, the_entry,(void *)&p_ace->unix_ug.uid) == -1) {
2514 DEBUG(0,("set_canon_ace_list: Failed to set qualifier on entry %d. (%s)\n",
2515 i, strerror(errno) ));
2516 goto fail;
2517 }
2518 }
2519
2520 /*
2521 * Convert the mode_t perms in the canon_ace to a POSIX permset.
2522 */
2523
2524 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, the_entry, &the_permset) == -1) {
2525 DEBUG(0,("set_canon_ace_list: Failed to get permset on entry %d. (%s)\n",
2526 i, strerror(errno) ));
2527 goto fail;
2528 }
2529
2530 if (map_acl_perms_to_permset(conn, p_ace->perms, &the_permset) == -1) {
2531 DEBUG(0,("set_canon_ace_list: Failed to create permset for mode (%u) on entry %d. (%s)\n",
2532 (unsigned int)p_ace->perms, i, strerror(errno) ));
2533 goto fail;
2534 }
2535
2536 /*
2537 * ..and apply them to the entry.
2538 */
2539
2540 if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, the_entry, the_permset) == -1) {
2541 DEBUG(0,("set_canon_ace_list: Failed to add permset on entry %d. (%s)\n",
2542 i, strerror(errno) ));
2543 goto fail;
2544 }
2545
2546 if( DEBUGLVL( 10 ))
2547 print_canon_ace( p_ace, i);
2548
2549 }
2550
2551 if (needs_mask && !got_mask_entry) {
2552 if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &the_acl, &mask_entry) == -1) {
2553 DEBUG(0,("set_canon_ace_list: Failed to create mask entry. (%s)\n", strerror(errno) ));
2554 goto fail;
2555 }
2556
2557 if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, mask_entry, SMB_ACL_MASK) == -1) {
2558 DEBUG(0,("set_canon_ace_list: Failed to set tag type on mask entry. (%s)\n",strerror(errno) ));
2559 goto fail;
2560 }
2561
2562 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, mask_entry, &mask_permset) == -1) {
2563 DEBUG(0,("set_canon_ace_list: Failed to get mask permset. (%s)\n", strerror(errno) ));
2564 goto fail;
2565 }
2566
2567 if (map_acl_perms_to_permset(conn, S_IRUSR|S_IWUSR|S_IXUSR, &mask_permset) == -1) {
2568 DEBUG(0,("set_canon_ace_list: Failed to create mask permset. (%s)\n", strerror(errno) ));
2569 goto fail;
2570 }
2571
2572 if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, mask_entry, mask_permset) == -1) {
2573 DEBUG(0,("set_canon_ace_list: Failed to add mask permset. (%s)\n", strerror(errno) ));
2574 goto fail;
2575 }
2576 }
2577
2578 /*
2579 * Finally apply it to the file or directory.
2580 */
2581
2582 if(default_ace || fsp->is_directory || fsp->fh->fd == -1) {
2583 if (SMB_VFS_SYS_ACL_SET_FILE(conn, fsp->fsp_name, the_acl_type, the_acl) == -1) {
2584 /*
2585 * Some systems allow all the above calls and only fail with no ACL support
2586 * when attempting to apply the acl. HPUX with HFS is an example of this. JRA.
2587 */
2588 if (no_acl_syscall_error(errno)) {
2589 *pacl_set_support = False;
2590 }
2591
2592 if (acl_group_override(conn, psbuf, fsp->fsp_name)) {
2593 int sret;
2594
2595 DEBUG(5,("set_canon_ace_list: acl group control on and current user in file %s primary group.\n",
2596 fsp->fsp_name ));
2597
2598 become_root();
2599 sret = SMB_VFS_SYS_ACL_SET_FILE(conn, fsp->fsp_name, the_acl_type, the_acl);
2600 unbecome_root();
2601 if (sret == 0) {
2602 ret = True;
2603 }
2604 }
2605
2606 if (ret == False) {
2607 DEBUG(2,("set_canon_ace_list: sys_acl_set_file type %s failed for file %s (%s).\n",
2608 the_acl_type == SMB_ACL_TYPE_DEFAULT ? "directory default" : "file",
2609 fsp->fsp_name, strerror(errno) ));
2610 goto fail;
2611 }
2612 }
2613 } else {
2614 if (SMB_VFS_SYS_ACL_SET_FD(fsp, the_acl) == -1) {
2615 /*
2616 * Some systems allow all the above calls and only fail with no ACL support
2617 * when attempting to apply the acl. HPUX with HFS is an example of this. JRA.
2618 */
2619 if (no_acl_syscall_error(errno)) {
2620 *pacl_set_support = False;
2621 }
2622
2623 if (acl_group_override(conn, psbuf, fsp->fsp_name)) {
2624 int sret;
2625
2626 DEBUG(5,("set_canon_ace_list: acl group control on and current user in file %s primary group.\n",
2627 fsp->fsp_name ));
2628
2629 become_root();
2630 sret = SMB_VFS_SYS_ACL_SET_FD(fsp, the_acl);
2631 unbecome_root();
2632 if (sret == 0) {
2633 ret = True;
2634 }
2635 }
2636
2637 if (ret == False) {
2638 DEBUG(2,("set_canon_ace_list: sys_acl_set_file failed for file %s (%s).\n",
2639 fsp->fsp_name, strerror(errno) ));
2640 goto fail;
2641 }
2642 }
2643 }
2644
2645 ret = True;
2646
2647 fail:
2648
2649 if (the_acl != NULL) {
2650 SMB_VFS_SYS_ACL_FREE_ACL(conn, the_acl);
2651 }
2652
2653 return ret;
2654 }
2655
2656 /****************************************************************************
2657 Find a particular canon_ace entry.
2658 ****************************************************************************/
2659
2660 static struct canon_ace *canon_ace_entry_for(struct canon_ace *list, SMB_ACL_TAG_T type, posix_id *id)
2661 {
2662 while (list) {
2663 if (list->type == type && ((type != SMB_ACL_USER && type != SMB_ACL_GROUP) ||
2664 (type == SMB_ACL_USER && id && id->uid == list->unix_ug.uid) ||
2665 (type == SMB_ACL_GROUP && id && id->gid == list->unix_ug.gid)))
2666 break;
2667 list = list->next;
2668 }
2669 return list;
2670 }
2671
2672 /****************************************************************************
2673
2674 ****************************************************************************/
2675
2676 SMB_ACL_T free_empty_sys_acl(connection_struct *conn, SMB_ACL_T the_acl)
2677 {
2678 SMB_ACL_ENTRY_T entry;
2679
2680 if (!the_acl)
2681 return NULL;
2682 if (SMB_VFS_SYS_ACL_GET_ENTRY(conn, the_acl, SMB_ACL_FIRST_ENTRY, &entry) != 1) {
2683 SMB_VFS_SYS_ACL_FREE_ACL(conn, the_acl);
2684 return NULL;
2685 }
2686 return the_acl;
2687 }
2688
2689 /****************************************************************************
2690 Convert a canon_ace to a generic 3 element permission - if possible.
2691 ****************************************************************************/
2692
2693 #define MAP_PERM(p,mask,result) (((p) & (mask)) ? (result) : 0 )
2694
2695 static bool convert_canon_ace_to_posix_perms( files_struct *fsp, canon_ace *file_ace_list, mode_t *posix_perms)
2696 {
2697 int snum = SNUM(fsp->conn);
2698 size_t ace_count = count_canon_ace_list(file_ace_list);
2699 canon_ace *ace_p;
2700 canon_ace *owner_ace = NULL;
2701 canon_ace *group_ace = NULL;
2702 canon_ace *other_ace = NULL;
2703 mode_t and_bits;
2704 mode_t or_bits;
2705
2706 if (ace_count != 3) {
2707 DEBUG(3,("convert_canon_ace_to_posix_perms: Too many ACE entries for file %s to convert to \
2708 posix perms.\n", fsp->fsp_name ));
2709 return False;
2710 }
2711
2712 for (ace_p = file_ace_list; ace_p; ace_p = ace_p->next) {
2713 if (ace_p->owner_type == UID_ACE)
2714 owner_ace = ace_p;
2715 else if (ace_p->owner_type == GID_ACE)
2716 group_ace = ace_p;
2717 else if (ace_p->owner_type == WORLD_ACE)
2718 other_ace = ace_p;
2719 }
2720
2721 if (!owner_ace || !group_ace || !other_ace) {
2722 DEBUG(3,("convert_canon_ace_to_posix_perms: Can't get standard entries for file %s.\n",
2723 fsp->fsp_name ));
2724 return False;
2725 }
2726
2727 *posix_perms = (mode_t)0;
2728
2729 *posix_perms |= owner_ace->perms;
2730 *posix_perms |= MAP_PERM(group_ace->perms, S_IRUSR, S_IRGRP);
2731 *posix_perms |= MAP_PERM(group_ace->perms, S_IWUSR, S_IWGRP);
2732 *posix_perms |= MAP_PERM(group_ace->perms, S_IXUSR, S_IXGRP);
2733 *posix_perms |= MAP_PERM(other_ace->perms, S_IRUSR, S_IROTH);
2734 *posix_perms |= MAP_PERM(other_ace->perms, S_IWUSR, S_IWOTH);
2735 *posix_perms |= MAP_PERM(other_ace->perms, S_IXUSR, S_IXOTH);
2736
2737 /* The owner must have at least read access. */
2738
2739 *posix_perms |= S_IRUSR;
2740 if (fsp->is_directory)
2741 *posix_perms |= (S_IWUSR|S_IXUSR);
2742
2743 /* If requested apply the masks. */
2744
2745 /* Get the initial bits to apply. */
2746
2747 if (fsp->is_directory) {
2748 and_bits = lp_dir_security_mask(snum);
2749 or_bits = lp_force_dir_security_mode(snum);
2750 } else {
2751 and_bits = lp_security_mask(snum);
2752 or_bits = lp_force_security_mode(snum);
2753 }
2754
2755 *posix_perms = (((*posix_perms) & and_bits)|or_bits);
2756
2757 DEBUG(10,("convert_canon_ace_to_posix_perms: converted u=%o,g=%o,w=%o to perm=0%o for file %s.\n",
2758 (int)owner_ace->perms, (int)group_ace->perms, (int)other_ace->perms, (int)*posix_perms,
2759 fsp->fsp_name ));
2760
2761 return True;
2762 }
2763
2764 /****************************************************************************
2765 Incoming NT ACLs on a directory can be split into a default POSIX acl (CI|OI|IO) and
2766 a normal POSIX acl. Win2k needs these split acls re-merging into one ACL
2767 with CI|OI set so it is inherited and also applies to the directory.
2768 Based on code from "Jim McDonough" <jmcd@us.ibm.com>.
2769 ****************************************************************************/
2770
2771 static size_t merge_default_aces( SEC_ACE *nt_ace_list, size_t num_aces)
2772 {
2773 size_t i, j;
2774
2775 for (i = 0; i < num_aces; i++) {
2776 for (j = i+1; j < num_aces; j++) {
2777 uint32 i_flags_ni = (nt_ace_list[i].flags & ~SEC_ACE_FLAG_INHERITED_ACE);
2778 uint32 j_flags_ni = (nt_ace_list[j].flags & ~SEC_ACE_FLAG_INHERITED_ACE);
2779 bool i_inh = (nt_ace_list[i].flags & SEC_ACE_FLAG_INHERITED_ACE) ? True : False;
2780 bool j_inh = (nt_ace_list[j].flags & SEC_ACE_FLAG_INHERITED_ACE) ? True : False;
2781
2782 /* We know the lower number ACE's are file entries. */
2783 if ((nt_ace_list[i].type == nt_ace_list[j].type) &&
2784 (nt_ace_list[i].size == nt_ace_list[j].size) &&
2785 (nt_ace_list[i].access_mask == nt_ace_list[j].access_mask) &&
2786 sid_equal(&nt_ace_list[i].trustee, &nt_ace_list[j].trustee) &&
2787 (i_inh == j_inh) &&
2788 (i_flags_ni == 0) &&
2789 (j_flags_ni == (SEC_ACE_FLAG_OBJECT_INHERIT|
2790 SEC_ACE_FLAG_CONTAINER_INHERIT|
2791 SEC_ACE_FLAG_INHERIT_ONLY))) {
2792 /*
2793 * W2K wants to have access allowed zero access ACE's
2794 * at the end of the list. If the mask is zero, merge
2795 * the non-inherited ACE onto the inherited ACE.
2796 */
2797
2798 if (nt_ace_list[i].access_mask == 0) {
2799 nt_ace_list[j].flags = SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT|
2800 (i_inh ? SEC_ACE_FLAG_INHERITED_ACE : 0);
2801 if (num_aces - i - 1 > 0)
2802 memmove(&nt_ace_list[i], &nt_ace_list[i+1], (num_aces-i-1) *
2803 sizeof(SEC_ACE));
2804
2805 DEBUG(10,("merge_default_aces: Merging zero access ACE %u onto ACE %u.\n",
2806 (unsigned int)i, (unsigned int)j ));
2807 } else {
2808 /*
2809 * These are identical except for the flags.
2810 * Merge the inherited ACE onto the non-inherited ACE.
2811 */
2812
2813 nt_ace_list[i].flags = SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT|
2814 (i_inh ? SEC_ACE_FLAG_INHERITED_ACE : 0);
2815 if (num_aces - j - 1 > 0)
2816 memmove(&nt_ace_list[j], &nt_ace_list[j+1], (num_aces-j-1) *
2817 sizeof(SEC_ACE));
2818
2819 DEBUG(10,("merge_default_aces: Merging ACE %u onto ACE %u.\n",
2820 (unsigned int)j, (unsigned int)i ));
2821 }
2822 num_aces--;
2823 break;
2824 }
2825 }
2826 }
2827
2828 return num_aces;
2829 }
2830
2831 /*
2832 * Add or Replace ACE entry.
2833 * In some cases we need to add a specific ACE for compatibility reasons.
2834 * When doing that we must make sure we are not actually creating a duplicate
2835 * entry. So we need to search whether an ACE entry already exist and eventually
2836 * replacce the access mask, or add a completely new entry if none was found.
2837 *
2838 * This function assumes the array has enough space to add a new entry without
2839 * any reallocation of memory.
2840 */
2841
2842 static void add_or_replace_ace(SEC_ACE *nt_ace_list, size_t *num_aces,
2843 const DOM_SID *sid, enum security_ace_type type,
2844 uint32_t mask, uint8_t flags)
2845 {
2846 int i;
2847
2848 /* first search for a duplicate */
2849 for (i = 0; i < *num_aces; i++) {
2850 if (sid_equal(&nt_ace_list[i].trustee, sid) &&
2851 (nt_ace_list[i].flags == flags)) break;
2852 }
2853
2854 if (i < *num_aces) { /* found */
2855 nt_ace_list[i].type = type;
2856 nt_ace_list[i].access_mask = mask;
2857 DEBUG(10, ("Replacing ACE %d with SID %s and flags %02x\n",
2858 i, sid_string_dbg(sid), flags));
2859 return;
2860 }
2861
2862 /* not found, append it */
2863 init_sec_ace(&nt_ace_list[(*num_aces)++], sid, type, mask, flags);
2864 }
2865
2866
2867 /****************************************************************************
2868 Reply to query a security descriptor from an fsp. If it succeeds it allocates
2869 the space for the return elements and returns the size needed to return the
2870 security descriptor. This should be the only external function needed for
2871 the UNIX style get ACL.
2872 ****************************************************************************/
2873
2874 static NTSTATUS posix_get_nt_acl_common(struct connection_struct *conn,
2875 const char *name,
2876 const SMB_STRUCT_STAT *sbuf,
2877 struct pai_val *pal,
2878 SMB_ACL_T posix_acl,
2879 SMB_ACL_T def_acl,
2880 uint32_t security_info,
2881 SEC_DESC **ppdesc)
2882 {
2883 DOM_SID owner_sid;
2884 DOM_SID group_sid;
2885 size_t sd_size = 0;
2886 SEC_ACL *psa = NULL;
2887 size_t num_acls = 0;
2888 size_t num_def_acls = 0;
2889 size_t num_aces = 0;
2890 canon_ace *file_ace = NULL;
2891 canon_ace *dir_ace = NULL;
2892 SEC_ACE *nt_ace_list = NULL;
2893 size_t num_profile_acls = 0;
2894 DOM_SID orig_owner_sid;
2895 SEC_DESC *psd = NULL;
2896 int i;
2897
2898 /*
2899 * Get the owner, group and world SIDs.
2900 */
2901
2902 create_file_sids(sbuf, &owner_sid, &group_sid);
2903
2904 if (lp_profile_acls(SNUM(conn))) {
2905 /* For WXP SP1 the owner must be administrators. */
2906 sid_copy(&orig_owner_sid, &owner_sid);
2907 sid_copy(&owner_sid, &global_sid_Builtin_Administrators);
2908 sid_copy(&group_sid, &global_sid_Builtin_Users);
2909 num_profile_acls = 3;
2910 }
2911
2912 if ((security_info & DACL_SECURITY_INFORMATION) && !(security_info & PROTECTED_DACL_SECURITY_INFORMATION)) {
2913
2914 /*
2915 * In the optimum case Creator Owner and Creator Group would be used for
2916 * the ACL_USER_OBJ and ACL_GROUP_OBJ entries, respectively, but this
2917 * would lead to usability problems under Windows: The Creator entries
2918 * are only available in browse lists of directories and not for files;
2919 * additionally the identity of the owning group couldn't be determined.
2920 * We therefore use those identities only for Default ACLs.
2921 */
2922
2923 /* Create the canon_ace lists. */
2924 file_ace = canonicalise_acl(conn, name, posix_acl, sbuf,
2925 &owner_sid, &group_sid, pal,
2926 SMB_ACL_TYPE_ACCESS);
2927
2928 /* We must have *some* ACLS. */
2929
2930 if (count_canon_ace_list(file_ace) == 0) {
2931 DEBUG(0,("get_nt_acl : No ACLs on file (%s) !\n", name));
2932 goto done;
2933 }
2934
2935 if (S_ISDIR(sbuf->st_mode) && def_acl) {
2936 dir_ace = canonicalise_acl(conn, name, def_acl,
2937 sbuf,
2938 &global_sid_Creator_Owner,
2939 &global_sid_Creator_Group,
2940 pal, SMB_ACL_TYPE_DEFAULT);
2941 }
2942
2943 /*
2944 * Create the NT ACE list from the canonical ace lists.
2945 */
2946
2947 {
2948 canon_ace *ace;
2949 enum security_ace_type nt_acl_type;
2950
2951 if (nt4_compatible_acls() && dir_ace) {
2952 /*
2953 * NT 4 chokes if an ACL contains an INHERIT_ONLY entry
2954 * but no non-INHERIT_ONLY entry for one SID. So we only
2955 * remove entries from the Access ACL if the
2956 * corresponding Default ACL entries have also been
2957 * removed. ACEs for CREATOR-OWNER and CREATOR-GROUP
2958 * are exceptions. We can do nothing
2959 * intelligent if the Default ACL contains entries that
2960 * are not also contained in the Access ACL, so this
2961 * case will still fail under NT 4.
2962 */
2963
2964 ace = canon_ace_entry_for(dir_ace, SMB_ACL_OTHER, NULL);
2965 if (ace && !ace->perms) {
2966 DLIST_REMOVE(dir_ace, ace);
2967 SAFE_FREE(ace);
2968
2969 ace = canon_ace_entry_for(file_ace, SMB_ACL_OTHER, NULL);
2970 if (ace && !ace->perms) {
2971 DLIST_REMOVE(file_ace, ace);
2972 SAFE_FREE(ace);
2973 }
2974 }
2975
2976 /*
2977 * WinNT doesn't usually have Creator Group
2978 * in browse lists, so we send this entry to
2979 * WinNT even if it contains no relevant
2980 * permissions. Once we can add
2981 * Creator Group to browse lists we can
2982 * re-enable this.
2983 */
2984
2985 #if 0
2986 ace = canon_ace_entry_for(dir_ace, SMB_ACL_GROUP_OBJ, NULL);
2987 if (ace && !ace->perms) {
2988 DLIST_REMOVE(dir_ace, ace);
2989 SAFE_FREE(ace);
2990 }
2991 #endif
2992
2993 ace = canon_ace_entry_for(file_ace, SMB_ACL_GROUP_OBJ, NULL);
2994 if (ace && !ace->perms) {
2995 DLIST_REMOVE(file_ace, ace);
2996 SAFE_FREE(ace);
2997 }
2998 }
2999
3000 num_acls = count_canon_ace_list(file_ace);
3001 num_def_acls = count_canon_ace_list(dir_ace);
3002
3003 /* Allocate the ace list. */
3004 if ((nt_ace_list = SMB_MALLOC_ARRAY(SEC_ACE,num_acls + num_profile_acls + num_def_acls)) == NULL) {
3005 DEBUG(0,("get_nt_acl: Unable to malloc space for nt_ace_list.\n"));
3006 goto done;
3007 }
3008
3009 memset(nt_ace_list, '\0', (num_acls + num_def_acls) * sizeof(SEC_ACE) );
3010
3011 /*
3012 * Create the NT ACE list from the canonical ace lists.
3013 */
3014
3015 for (ace = file_ace; ace != NULL; ace = ace->next) {
3016 uint32_t acc = map_canon_ace_perms(SNUM(conn),
3017 &nt_acl_type,
3018 ace->perms,
3019 S_ISDIR(sbuf->st_mode));
3020 init_sec_ace(&nt_ace_list[num_aces++],
3021 &ace->trustee,
3022 nt_acl_type,
3023 acc,
3024 ace->inherited ?
3025 SEC_ACE_FLAG_INHERITED_ACE : 0);
3026 }
3027
3028 /* The User must have access to a profile share - even
3029 * if we can't map the SID. */
3030 if (lp_profile_acls(SNUM(conn))) {
3031 add_or_replace_ace(nt_ace_list, &num_aces,
3032 &global_sid_Builtin_Users,
3033 SEC_ACE_TYPE_ACCESS_ALLOWED,
3034 FILE_GENERIC_ALL, 0);
3035 }
3036
3037 for (ace = dir_ace; ace != NULL; ace = ace->next) {
3038 uint32_t acc = map_canon_ace_perms(SNUM(conn),
3039 &nt_acl_type,
3040 ace->perms,
3041 S_ISDIR(sbuf->st_mode));
3042 init_sec_ace(&nt_ace_list[num_aces++],
3043 &ace->trustee,
3044 nt_acl_type,
3045 acc,
3046 SEC_ACE_FLAG_OBJECT_INHERIT|
3047 SEC_ACE_FLAG_CONTAINER_INHERIT|
3048 SEC_ACE_FLAG_INHERIT_ONLY|
3049 (ace->inherited ?
3050 SEC_ACE_FLAG_INHERITED_ACE : 0));
3051 }
3052
3053 /* The User must have access to a profile share - even
3054 * if we can't map the SID. */
3055 if (lp_profile_acls(SNUM(conn))) {
3056 add_or_replace_ace(nt_ace_list, &num_aces,
3057 &global_sid_Builtin_Users,
3058 SEC_ACE_TYPE_ACCESS_ALLOWED,
3059 FILE_GENERIC_ALL,
3060 SEC_ACE_FLAG_OBJECT_INHERIT |
3061 SEC_ACE_FLAG_CONTAINER_INHERIT |
3062 SEC_ACE_FLAG_INHERIT_ONLY);
3063 }
3064
3065 /*
3066 * Merge POSIX default ACLs and normal ACLs into one NT ACE.
3067 * Win2K needs this to get the inheritance correct when replacing ACLs
3068 * on a directory tree. Based on work by Jim @ IBM.
3069 */
3070
3071 num_aces = merge_default_aces(nt_ace_list, num_aces);
3072
3073 if (lp_profile_acls(SNUM(conn))) {
3074 for (i = 0; i < num_aces; i++) {
3075 if (sid_equal(&nt_ace_list[i].trustee, &owner_sid)) {
3076 add_or_replace_ace(nt_ace_list, &num_aces,
3077 &orig_owner_sid,
3078 nt_ace_list[i].type,
3079 nt_ace_list[i].access_mask,
3080 nt_ace_list[i].flags);
3081 break;
3082 }
3083 }
3084 }
3085 }
3086
3087 if (num_aces) {
3088 if((psa = make_sec_acl( talloc_tos(), NT4_ACL_REVISION, num_aces, nt_ace_list)) == NULL) {
3089 DEBUG(0,("get_nt_acl: Unable to malloc space for acl.\n"));
3090 goto done;
3091 }
3092 }
3093 } /* security_info & DACL_SECURITY_INFORMATION */
3094
3095 psd = make_standard_sec_desc( talloc_tos(),
3096 (security_info & OWNER_SECURITY_INFORMATION) ? &owner_sid : NULL,
3097 (security_info & GROUP_SECURITY_INFORMATION) ? &group_sid : NULL,
3098 psa,
3099 &sd_size);
3100
3101 if(!psd) {
3102 DEBUG(0,("get_nt_acl: Unable to malloc space for security descriptor.\n"));
3103 sd_size = 0;
3104 goto done;
3105 }
3106
3107 /*
3108 * Windows 2000: The DACL_PROTECTED flag in the security
3109 * descriptor marks the ACL as non-inheriting, i.e., no
3110 * ACEs from higher level directories propagate to this
3111 * ACL. In the POSIX ACL model permissions are only
3112 * inherited at file create time, so ACLs never contain
3113 * any ACEs that are inherited dynamically. The DACL_PROTECTED
3114 * flag doesn't seem to bother Windows NT.
3115 * Always set this if map acl inherit is turned off.
3116 */
3117 if (get_protected_flag(pal) || !lp_map_acl_inherit(SNUM(conn))) {
3118 psd->type |= SE_DESC_DACL_PROTECTED;
3119 }
3120
3121 if (psd->dacl) {
3122 dacl_sort_into_canonical_order(psd->dacl->aces, (unsigned int)psd->dacl->num_aces);
3123 }
3124
3125 *ppdesc = psd;
3126
3127 done:
3128
3129 if (posix_acl) {
3130 SMB_VFS_SYS_ACL_FREE_ACL(conn, posix_acl);
3131 }
3132 if (def_acl) {
3133 SMB_VFS_SYS_ACL_FREE_ACL(conn, def_acl);
3134 }
3135 free_canon_ace_list(file_ace);
3136 free_canon_ace_list(dir_ace);
3137 free_inherited_info(pal);
3138 SAFE_FREE(nt_ace_list);
3139
3140 return NT_STATUS_OK;
3141 }
3142
3143 NTSTATUS posix_fget_nt_acl(struct files_struct *fsp, uint32_t security_info,
3144 SEC_DESC **ppdesc)
3145 {
3146 SMB_STRUCT_STAT sbuf;
3147 SMB_ACL_T posix_acl = NULL;
3148 struct pai_val *pal;
3149
3150 *ppdesc = NULL;
3151
3152 DEBUG(10,("posix_fget_nt_acl: called for file %s\n", fsp->fsp_name ));
3153
3154 /* can it happen that fsp_name == NULL ? */
3155 if (fsp->is_directory || fsp->fh->fd == -1) {
3156 return posix_get_nt_acl(fsp->conn, fsp->fsp_name,
3157 security_info, ppdesc);
3158 }
3159
3160 /* Get the stat struct for the owner info. */
3161 if(SMB_VFS_FSTAT(fsp, &sbuf) != 0) {
3162 return map_nt_error_from_unix(errno);
3163 }
3164
3165 /* Get the ACL from the fd. */
3166 posix_acl = SMB_VFS_SYS_ACL_GET_FD(fsp);
3167
3168 pal = fload_inherited_info(fsp);
3169
3170 return posix_get_nt_acl_common(fsp->conn, fsp->fsp_name, &sbuf, pal,
3171 posix_acl, NULL, security_info, ppdesc);
3172 }
3173
3174 NTSTATUS posix_get_nt_acl(struct connection_struct *conn, const char *name,
3175 uint32_t security_info, SEC_DESC **ppdesc)
3176 {
3177 SMB_STRUCT_STAT sbuf;
3178 SMB_ACL_T posix_acl = NULL;
3179 SMB_ACL_T def_acl = NULL;
3180 struct pai_val *pal;
3181
3182 *ppdesc = NULL;
3183
3184 DEBUG(10,("posix_get_nt_acl: called for file %s\n", name ));
3185
3186 /* Get the stat struct for the owner info. */
3187 if(SMB_VFS_STAT(conn, name, &sbuf) != 0) {
3188 return map_nt_error_from_unix(errno);
3189 }
3190
3191 /* Get the ACL from the path. */
3192 posix_acl = SMB_VFS_SYS_ACL_GET_FILE(conn, name, SMB_ACL_TYPE_ACCESS);
3193
3194 /* If it's a directory get the default POSIX ACL. */
3195 if(S_ISDIR(sbuf.st_mode)) {
3196 def_acl = SMB_VFS_SYS_ACL_GET_FILE(conn, name, SMB_ACL_TYPE_DEFAULT);
3197 def_acl = free_empty_sys_acl(conn, def_acl);
3198 }
3199
3200 pal = load_inherited_info(conn, name);
3201
3202 return posix_get_nt_acl_common(conn, name, &sbuf, pal, posix_acl,
3203 def_acl, security_info, ppdesc);
3204 }
3205
3206 /****************************************************************************
3207 Try to chown a file. We will be able to chown it under the following conditions.
3208
3209 1) If we have root privileges, then it will just work.
3210 2) If we have SeTakeOwnershipPrivilege we can change the user to the current user.
3211 3) If we have SeRestorePrivilege we can change the user to any other user.
3212 4) If we have write permission to the file and dos_filemodes is set
3213 then allow chown to the currently authenticated user.
3214 ****************************************************************************/
3215
3216 int try_chown(connection_struct *conn, const char *fname, uid_t uid, gid_t gid)
3217 {
3218 int ret;
3219 files_struct *fsp;
3220 SMB_STRUCT_STAT st;
3221
3222 if(!CAN_WRITE(conn)) {
3223 return -1;
3224 }
3225
3226 /* Case (1). */
3227 /* try the direct way first */
3228 ret = SMB_VFS_CHOWN(conn, fname, uid, gid);
3229 if (ret == 0)
3230 return 0;
3231
3232 /* Case (2) / (3) */
3233 if (lp_enable_privileges()) {
3234
3235 bool has_take_ownership_priv = user_has_privileges(current_user.nt_user_token,
3236 &se_take_ownership);
3237 bool has_restore_priv = user_has_privileges(current_user.nt_user_token,
3238 &se_restore);
3239
3240 /* Case (2) */
3241 if ( ( has_take_ownership_priv && ( uid == current_user.ut.uid ) ) ||
3242 /* Case (3) */
3243 ( has_restore_priv ) ) {
3244
3245 become_root();
3246 /* Keep the current file gid the same - take ownership doesn't imply group change. */
3247 ret = SMB_VFS_CHOWN(conn, fname, uid, (gid_t)-1);
3248 unbecome_root();
3249 return ret;
3250 }
3251 }
3252
3253 /* Case (4). */
3254 if (!lp_dos_filemode(SNUM(conn))) {
3255 errno = EPERM;
3256 return -1;
3257 }
3258
3259 /* only allow chown to the current user. This is more secure,
3260 and also copes with the case where the SID in a take ownership ACL is
3261 a local SID on the users workstation
3262 */
3263 if (uid != current_user.ut.uid) {
3264 errno = EPERM;
3265 return -1;
3266 }
3267
3268 if (SMB_VFS_STAT(conn,fname,&st)) {
3269 return -1;
3270 }
3271
3272 if (!NT_STATUS_IS_OK(open_file_fchmod(conn,fname,&st,&fsp))) {
3273 return -1;
3274 }
3275
3276 become_root();
3277 /* Keep the current file gid the same. */
3278 ret = SMB_VFS_FCHOWN(fsp, uid, (gid_t)-1);
3279 unbecome_root();
3280
3281 close_file_fchmod(fsp);
3282
3283 return ret;
3284 }
3285
3286 #if 0
3287 /* Disable this - prevents ACL inheritance from the ACL editor. JRA. */
3288
3289 /****************************************************************************
3290 Take care of parent ACL inheritance.
3291 ****************************************************************************/
3292
3293 NTSTATUS append_parent_acl(files_struct *fsp,
3294 const SEC_DESC *pcsd,
3295 SEC_DESC **pp_new_sd)
3296 {
3297 SEC_DESC *parent_sd = NULL;
3298 files_struct *parent_fsp = NULL;
3299 TALLOC_CTX *mem_ctx = talloc_tos();
3300 char *parent_name = NULL;
3301 SEC_ACE *new_ace = NULL;
3302 unsigned int num_aces = pcsd->dacl->num_aces;
3303 SMB_STRUCT_STAT sbuf;
3304 NTSTATUS status;
3305 int info;
3306 unsigned int i, j;
3307 SEC_DESC *psd = dup_sec_desc(talloc_tos(), pcsd);
3308 bool is_dacl_protected = (pcsd->type & SE_DESC_DACL_PROTECTED);
3309
3310 ZERO_STRUCT(sbuf);
3311
3312 if (psd == NULL) {
3313 return NT_STATUS_NO_MEMORY;
3314 }
3315
3316 if (!parent_dirname_talloc(mem_ctx,
3317 fsp->fsp_name,
3318 &parent_name,
3319 NULL)) {
3320 return NT_STATUS_NO_MEMORY;
3321 }
3322
3323 status = open_directory(fsp->conn,
3324 NULL,
3325 parent_name,
3326 &sbuf,
3327 FILE_READ_ATTRIBUTES, /* Just a stat open */
3328 FILE_SHARE_NONE, /* Ignored for stat opens */
3329 FILE_OPEN,
3330 0,
3331 INTERNAL_OPEN_ONLY,
3332 &info,
3333 &parent_fsp);
3334
3335 if (!NT_STATUS_IS_OK(status)) {
3336 return status;
3337 }
3338
3339 status = SMB_VFS_GET_NT_ACL(parent_fsp->conn, parent_fsp->fsp_name,
3340 DACL_SECURITY_INFORMATION, &parent_sd );
3341
3342 close_file(parent_fsp, NORMAL_CLOSE);
3343
3344 if (!NT_STATUS_IS_OK(status)) {
3345 return status;
3346 }
3347
3348 /*
3349 * Make room for potentially all the ACLs from
3350 * the parent. We used to add the ugw triple here,
3351 * as we knew we were dealing with POSIX ACLs.
3352 * We no longer need to do so as we can guarentee
3353 * that a default ACL from the parent directory will
3354 * be well formed for POSIX ACLs if it came from a
3355 * POSIX ACL source, and if we're not writing to a
3356 * POSIX ACL sink then we don't care if it's not well
3357 * formed. JRA.
3358 */
3359
3360 num_aces += parent_sd->dacl->num_aces;
3361
3362 if((new_ace = TALLOC_ZERO_ARRAY(mem_ctx, SEC_ACE,
3363 num_aces)) == NULL) {
3364 return NT_STATUS_NO_MEMORY;
3365 }
3366
3367 /* Start by copying in all the given ACE entries. */
3368 for (i = 0; i < psd->dacl->num_aces; i++) {
3369 sec_ace_copy(&new_ace[i], &psd->dacl->aces[i]);
3370 }
3371
3372 /*
3373 * Note that we're ignoring "inherit permissions" here
3374 * as that really only applies to newly created files. JRA.
3375 */
3376
3377 /* Finally append any inherited ACEs. */
3378 for (j = 0; j < parent_sd->dacl->num_aces; j++) {
3379 SEC_ACE *se = &parent_sd->dacl->aces[j];
3380
3381 if (fsp->is_directory) {
3382 if (!(se->flags & SEC_ACE_FLAG_CONTAINER_INHERIT)) {
3383 /* Doesn't apply to a directory - ignore. */
3384 DEBUG(10,("append_parent_acl: directory %s "
3385 "ignoring non container "
3386 "inherit flags %u on ACE with sid %s "
3387 "from parent %s\n",
3388 fsp->fsp_name,
3389 (unsigned int)se->flags,
3390 sid_string_dbg(&se->trustee),
3391 parent_name));
3392 continue;
3393 }
3394 } else {
3395 if (!(se->flags & SEC_ACE_FLAG_OBJECT_INHERIT)) {
3396 /* Doesn't apply to a file - ignore. */
3397 DEBUG(10,("append_parent_acl: file %s "
3398 "ignoring non object "
3399 "inherit flags %u on ACE with sid %s "
3400 "from parent %s\n",
3401 fsp->fsp_name,
3402 (unsigned int)se->flags,
3403 sid_string_dbg(&se->trustee),
3404 parent_name));
3405 continue;
3406 }
3407 }
3408
3409 if (is_dacl_protected) {
3410 /* If the DACL is protected it means we must
3411 * not overwrite an existing ACE entry with the
3412 * same SID. This is order N^2. Ouch :-(. JRA. */
3413 unsigned int k;
3414 for (k = 0; k < psd->dacl->num_aces; k++) {
3415 if (sid_equal(&psd->dacl->aces[k].trustee,
3416 &se->trustee)) {
3417 break;
3418 }
3419 }
3420 if (k < psd->dacl->num_aces) {
3421 /* SID matched. Ignore. */
3422 DEBUG(10,("append_parent_acl: path %s "
3423 "ignoring ACE with protected sid %s "
3424 "from parent %s\n",
3425 fsp->fsp_name,
3426 sid_string_dbg(&se->trustee),
3427 parent_name));
3428 continue;
3429 }
3430 }
3431
3432 sec_ace_copy(&new_ace[i], se);
3433 if (se->flags & SEC_ACE_FLAG_NO_PROPAGATE_INHERIT) {
3434 new_ace[i].flags &= ~(SEC_ACE_FLAG_VALID_INHERIT);
3435 }
3436 new_ace[i].flags |= SEC_ACE_FLAG_INHERITED_ACE;
3437
3438 if (fsp->is_directory) {
3439 /*
3440 * Strip off any inherit only. It's applied.
3441 */
3442 new_ace[i].flags &= ~(SEC_ACE_FLAG_INHERIT_ONLY);
3443 if (se->flags & SEC_ACE_FLAG_NO_PROPAGATE_INHERIT) {
3444 /* No further inheritance. */
3445 new_ace[i].flags &=
3446 ~(SEC_ACE_FLAG_CONTAINER_INHERIT|
3447 SEC_ACE_FLAG_OBJECT_INHERIT);
3448 }
3449 } else {
3450 /*
3451 * Strip off any container or inherit
3452 * flags, they can't apply to objects.
3453 */
3454 new_ace[i].flags &= ~(SEC_ACE_FLAG_CONTAINER_INHERIT|
3455 SEC_ACE_FLAG_INHERIT_ONLY|
3456 SEC_ACE_FLAG_NO_PROPAGATE_INHERIT);
3457 }
3458 i++;
3459
3460 DEBUG(10,("append_parent_acl: path %s "
3461 "inheriting ACE with sid %s "
3462 "from parent %s\n",
3463 fsp->fsp_name,
3464 sid_string_dbg(&se->trustee),
3465 parent_name));
3466 }
3467
3468 psd->dacl->aces = new_ace;
3469 psd->dacl->num_aces = i;
3470 psd->type &= ~(SE_DESC_DACL_AUTO_INHERITED|
3471 SE_DESC_DACL_AUTO_INHERIT_REQ);
3472
3473 *pp_new_sd = psd;
3474 return status;
3475 }
3476 #endif
3477
3478 /****************************************************************************
3479 Reply to set a security descriptor on an fsp. security_info_sent is the
3480 description of the following NT ACL.
3481 This should be the only external function needed for the UNIX style set ACL.
3482 ****************************************************************************/
3483
3484 NTSTATUS set_nt_acl(files_struct *fsp, uint32 security_info_sent, const SEC_DESC *psd)
3485 {
3486 connection_struct *conn = fsp->conn;
3487 uid_t user = (uid_t)-1;
3488 gid_t grp = (gid_t)-1;
3489 SMB_STRUCT_STAT sbuf;
3490 DOM_SID file_owner_sid;
3491 DOM_SID file_grp_sid;
3492 canon_ace *file_ace_list = NULL;
3493 canon_ace *dir_ace_list = NULL;
3494 bool acl_perms = False;
3495 mode_t orig_mode = (mode_t)0;
3496 NTSTATUS status;
3497 bool set_acl_as_root = false;
3498 bool acl_set_support = false;
3499 bool ret = false;
3500
3501 DEBUG(10,("set_nt_acl: called for file %s\n", fsp->fsp_name ));
3502
3503 if (!CAN_WRITE(conn)) {
3504 DEBUG(10,("set acl rejected on read-only share\n"));
3505 return NT_STATUS_MEDIA_WRITE_PROTECTED;
3506 }
3507
3508 /*
3509 * Get the current state of the file.
3510 */
3511
3512 if(fsp->is_directory || fsp->fh->fd == -1) {
3513 if(SMB_VFS_STAT(fsp->conn,fsp->fsp_name, &sbuf) != 0)
3514 return map_nt_error_from_unix(errno);
3515 } else {
3516 if(SMB_VFS_FSTAT(fsp, &sbuf) != 0)
3517 return map_nt_error_from_unix(errno);
3518 }
3519
3520 /* Save the original element we check against. */
3521 orig_mode = sbuf.st_mode;
3522
3523 /*
3524 * Unpack the user/group/world id's.
3525 */
3526
3527 status = unpack_nt_owners( SNUM(conn), &user, &grp, security_info_sent, psd);
3528 if (!NT_STATUS_IS_OK(status)) {
3529 return status;
3530 }
3531
3532 /*
3533 * Do we need to chown ? If so this must be done first as the incoming
3534 * CREATOR_OWNER acl will be relative to the *new* owner, not the old.
3535 * Noticed by Simo.
3536 */
3537
3538 if (((user != (uid_t)-1) && (sbuf.st_uid != user)) || (( grp != (gid_t)-1) && (sbuf.st_gid != grp))) {
3539
3540 DEBUG(3,("set_nt_acl: chown %s. uid = %u, gid = %u.\n",
3541 fsp->fsp_name, (unsigned int)user, (unsigned int)grp ));
3542
3543 if(try_chown( fsp->conn, fsp->fsp_name, user, grp) == -1) {
3544 DEBUG(3,("set_nt_acl: chown %s, %u, %u failed. Error = %s.\n",
3545 fsp->fsp_name, (unsigned int)user, (unsigned int)grp, strerror(errno) ));
3546 if (errno == EPERM) {
3547 return NT_STATUS_INVALID_OWNER;
3548 }
3549 return map_nt_error_from_unix(errno);
3550 }
3551
3552 /*
3553 * Recheck the current state of the file, which may have changed.
3554 * (suid/sgid bits, for instance)
3555 */
3556
3557 if(fsp->is_directory) {
3558 if(SMB_VFS_STAT(fsp->conn, fsp->fsp_name, &sbuf) != 0) {
3559 return map_nt_error_from_unix(errno);
3560 }
3561 } else {
3562
3563 int sret;
3564
3565 if(fsp->fh->fd == -1)
3566 sret = SMB_VFS_STAT(fsp->conn, fsp->fsp_name, &sbuf);
3567 else
3568 sret = SMB_VFS_FSTAT(fsp, &sbuf);
3569
3570 if(sret != 0)
3571 return map_nt_error_from_unix(errno);
3572 }
3573
3574 /* Save the original element we check against. */
3575 orig_mode = sbuf.st_mode;
3576
3577 /* If we successfully chowned, we know we must
3578 * be able to set the acl, so do it as root.
3579 */
3580 set_acl_as_root = true;
3581 }
3582
3583 create_file_sids(&sbuf, &file_owner_sid, &file_grp_sid);
3584
3585 acl_perms = unpack_canon_ace( fsp, &sbuf, &file_owner_sid, &file_grp_sid,
3586 &file_ace_list, &dir_ace_list, security_info_sent, psd);
3587
3588 /* Ignore W2K traverse DACL set. */
3589 if (!file_ace_list && !dir_ace_list) {
3590 return NT_STATUS_OK;
3591 }
3592
3593 if (!acl_perms) {
3594 DEBUG(3,("set_nt_acl: cannot set permissions\n"));
3595 free_canon_ace_list(file_ace_list);
3596 free_canon_ace_list(dir_ace_list);
3597 return NT_STATUS_ACCESS_DENIED;
3598 }
3599
3600 /*
3601 * Only change security if we got a DACL.
3602 */
3603
3604 if(!(security_info_sent & DACL_SECURITY_INFORMATION) || (psd->dacl == NULL)) {
3605 free_canon_ace_list(file_ace_list);
3606 free_canon_ace_list(dir_ace_list);
3607 return NT_STATUS_OK;
3608 }
3609
3610 /*
3611 * Try using the POSIX ACL set first. Fall back to chmod if
3612 * we have no ACL support on this filesystem.
3613 */
3614
3615 if (acl_perms && file_ace_list) {
3616 if (set_acl_as_root) {
3617 become_root();
3618 }
3619 ret = set_canon_ace_list(fsp, file_ace_list, False, &sbuf, &acl_set_support);
3620 if (set_acl_as_root) {
3621 unbecome_root();
3622 }
3623 if (acl_set_support && ret == false) {
3624 DEBUG(3,("set_nt_acl: failed to set file acl on file %s (%s).\n", fsp->fsp_name, strerror(errno) ));
3625 free_canon_ace_list(file_ace_list);
3626 free_canon_ace_list(dir_ace_list);
3627 return map_nt_error_from_unix(errno);
3628 }
3629 }
3630
3631 if (acl_perms && acl_set_support && fsp->is_directory) {
3632 if (dir_ace_list) {
3633 if (set_acl_as_root) {
3634 become_root();
3635 }
3636 ret = set_canon_ace_list(fsp, dir_ace_list, True, &sbuf, &acl_set_support);
3637 if (set_acl_as_root) {
3638 unbecome_root();
3639 }
3640 if (ret == false) {
3641 DEBUG(3,("set_nt_acl: failed to set default acl on directory %s (%s).\n", fsp->fsp_name, strerror(errno) ));
3642 free_canon_ace_list(file_ace_list);
3643 free_canon_ace_list(dir_ace_list);
3644 return map_nt_error_from_unix(errno);
3645 }
3646 } else {
3647 int sret = -1;
3648
3649 /*
3650 * No default ACL - delete one if it exists.
3651 */
3652
3653 if (set_acl_as_root) {
3654 become_root();
3655 }
3656 sret = SMB_VFS_SYS_ACL_DELETE_DEF_FILE(conn, fsp->fsp_name);
3657 if (set_acl_as_root) {
3658 unbecome_root();
3659 }
3660 if (sret == -1) {
3661 if (acl_group_override(conn, &sbuf, fsp->fsp_name)) {
3662 DEBUG(5,("set_nt_acl: acl group control on and "
3663 "current user in file %s primary group. Override delete_def_acl\n",
3664 fsp->fsp_name ));
3665
3666 become_root();
3667 sret = SMB_VFS_SYS_ACL_DELETE_DEF_FILE(conn, fsp->fsp_name);
3668 unbecome_root();
3669 }
3670
3671 if (sret == -1) {
3672 DEBUG(3,("set_nt_acl: sys_acl_delete_def_file failed (%s)\n", strerror(errno)));
3673 free_canon_ace_list(file_ace_list);
3674 free_canon_ace_list(dir_ace_list);
3675 return map_nt_error_from_unix(errno);
3676 }
3677 }
3678 }
3679 }
3680
3681 if (acl_set_support) {
3682 if (set_acl_as_root) {
3683 become_root();
3684 }
3685 store_inheritance_attributes(fsp, file_ace_list, dir_ace_list,
3686 (psd->type & SE_DESC_DACL_PROTECTED) ? True : False);
3687 if (set_acl_as_root) {
3688 unbecome_root();
3689 }
3690 }
3691
3692 /*
3693 * If we cannot set using POSIX ACLs we fall back to checking if we need to chmod.
3694 */
3695
3696 if(!acl_set_support && acl_perms) {
3697 mode_t posix_perms;
3698
3699 if (!convert_canon_ace_to_posix_perms( fsp, file_ace_list, &posix_perms)) {
3700 free_canon_ace_list(file_ace_list);
3701 free_canon_ace_list(dir_ace_list);
3702 DEBUG(3,("set_nt_acl: failed to convert file acl to posix permissions for file %s.\n",
3703 fsp->fsp_name ));
3704 return NT_STATUS_ACCESS_DENIED;
3705 }
3706
3707 if (orig_mode != posix_perms) {
3708 int sret = -1;
3709
3710 DEBUG(3,("set_nt_acl: chmod %s. perms = 0%o.\n",
3711 fsp->fsp_name, (unsigned int)posix_perms ));
3712
3713 if (set_acl_as_root) {
3714 become_root();
3715 }
3716 sret = SMB_VFS_CHMOD(conn,fsp->fsp_name, posix_perms);
3717 if (set_acl_as_root) {
3718 unbecome_root();
3719 }
3720 if(sret == -1) {
3721 if (acl_group_override(conn, &sbuf, fsp->fsp_name)) {
3722 DEBUG(5,("set_nt_acl: acl group control on and "
3723 "current user in file %s primary group. Override chmod\n",
3724 fsp->fsp_name ));
3725
3726 become_root();
3727 sret = SMB_VFS_CHMOD(conn,fsp->fsp_name, posix_perms);
3728 unbecome_root();
3729 }
3730
3731 if (sret == -1) {
3732 DEBUG(3,("set_nt_acl: chmod %s, 0%o failed. Error = %s.\n",
3733 fsp->fsp_name, (unsigned int)posix_perms, strerror(errno) ));
3734 free_canon_ace_list(file_ace_list);
3735 free_canon_ace_list(dir_ace_list);
3736 return map_nt_error_from_unix(errno);
3737 }
3738 }
3739 }
3740 }
3741
3742 free_canon_ace_list(file_ace_list);
3743 free_canon_ace_list(dir_ace_list);
3744
3745 return NT_STATUS_OK;
3746 }
3747
3748 /****************************************************************************
3749 Get the actual group bits stored on a file with an ACL. Has no effect if
3750 the file has no ACL. Needed in dosmode code where the stat() will return
3751 the mask bits, not the real group bits, for a file with an ACL.
3752 ****************************************************************************/
3753
3754 int get_acl_group_bits( connection_struct *conn, const char *fname, mode_t *mode )
3755 {
3756 int entry_id = SMB_ACL_FIRST_ENTRY;
3757 SMB_ACL_ENTRY_T entry;
3758 SMB_ACL_T posix_acl;
3759 int result = -1;
3760
3761 posix_acl = SMB_VFS_SYS_ACL_GET_FILE(conn, fname, SMB_ACL_TYPE_ACCESS);
3762 if (posix_acl == (SMB_ACL_T)NULL)
3763 return -1;
3764
3765 while (SMB_VFS_SYS_ACL_GET_ENTRY(conn, posix_acl, entry_id, &entry) == 1) {
3766 SMB_ACL_TAG_T tagtype;
3767 SMB_ACL_PERMSET_T permset;
3768
3769 entry_id = SMB_ACL_NEXT_ENTRY;
3770
3771 if (SMB_VFS_SYS_ACL_GET_TAG_TYPE(conn, entry, &tagtype) ==-1)
3772 break;
3773
3774 if (tagtype == SMB_ACL_GROUP_OBJ) {
3775 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, entry, &permset) == -1) {
3776 break;
3777 } else {
3778 *mode &= ~(S_IRGRP|S_IWGRP|S_IXGRP);
3779 *mode |= (SMB_VFS_SYS_ACL_GET_PERM(conn, permset, SMB_ACL_READ) ? S_IRGRP : 0);
3780 *mode |= (SMB_VFS_SYS_ACL_GET_PERM(conn, permset, SMB_ACL_WRITE) ? S_IWGRP : 0);
3781 *mode |= (SMB_VFS_SYS_ACL_GET_PERM(conn, permset, SMB_ACL_EXECUTE) ? S_IXGRP : 0);
3782 result = 0;
3783 break;
3784 }
3785 }
3786 }
3787 SMB_VFS_SYS_ACL_FREE_ACL(conn, posix_acl);
3788 return result;
3789 }
3790
3791 /****************************************************************************
3792 Do a chmod by setting the ACL USER_OBJ, GROUP_OBJ and OTHER bits in an ACL
3793 and set the mask to rwx. Needed to preserve complex ACLs set by NT.
3794 ****************************************************************************/
3795
3796 static int chmod_acl_internals( connection_struct *conn, SMB_ACL_T posix_acl, mode_t mode)
3797 {
3798 int entry_id = SMB_ACL_FIRST_ENTRY;
3799 SMB_ACL_ENTRY_T entry;
3800 int num_entries = 0;
3801
3802 while ( SMB_VFS_SYS_ACL_GET_ENTRY(conn, posix_acl, entry_id, &entry) == 1) {
3803 SMB_ACL_TAG_T tagtype;
3804 SMB_ACL_PERMSET_T permset;
3805 mode_t perms;
3806
3807 entry_id = SMB_ACL_NEXT_ENTRY;
3808
3809 if (SMB_VFS_SYS_ACL_GET_TAG_TYPE(conn, entry, &tagtype) == -1)
3810 return -1;
3811
3812 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, entry, &permset) == -1)
3813 return -1;
3814
3815 num_entries++;
3816
3817 switch(tagtype) {
3818 case SMB_ACL_USER_OBJ:
3819 perms = unix_perms_to_acl_perms(mode, S_IRUSR, S_IWUSR, S_IXUSR);
3820 break;
3821 case SMB_ACL_GROUP_OBJ:
3822 perms = unix_perms_to_acl_perms(mode, S_IRGRP, S_IWGRP, S_IXGRP);
3823 break;
3824 case SMB_ACL_MASK:
3825 /*
3826 * FIXME: The ACL_MASK entry permissions should really be set to
3827 * the union of the permissions of all ACL_USER,
3828 * ACL_GROUP_OBJ, and ACL_GROUP entries. That's what
3829 * acl_calc_mask() does, but Samba ACLs doesn't provide it.
3830 */
3831 perms = S_IRUSR|S_IWUSR|S_IXUSR;
3832 break;
3833 case SMB_ACL_OTHER:
3834 perms = unix_perms_to_acl_perms(mode, S_IROTH, S_IWOTH, S_IXOTH);
3835 break;
3836 default:
3837 continue;
3838 }
3839
3840 if (map_acl_perms_to_permset(conn, perms, &permset) == -1)
3841 return -1;
3842
3843 if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, entry, permset) == -1)
3844 return -1;
3845 }
3846
3847 /*
3848 * If this is a simple 3 element ACL or no elements then it's a standard
3849 * UNIX permission set. Just use chmod...
3850 */
3851
3852 if ((num_entries == 3) || (num_entries == 0))
3853 return -1;
3854
3855 return 0;
3856 }
3857
3858 /****************************************************************************
3859 Get the access ACL of FROM, do a chmod by setting the ACL USER_OBJ,
3860 GROUP_OBJ and OTHER bits in an ACL and set the mask to rwx. Set the
3861 resulting ACL on TO. Note that name is in UNIX character set.
3862 ****************************************************************************/
3863
3864 static int copy_access_posix_acl(connection_struct *conn, const char *from, const char *to, mode_t mode)
3865 {
3866 SMB_ACL_T posix_acl = NULL;
3867 int ret = -1;
3868
3869 if ((posix_acl = SMB_VFS_SYS_ACL_GET_FILE(conn, from, SMB_ACL_TYPE_ACCESS)) == NULL)
3870 return -1;
3871
3872 if ((ret = chmod_acl_internals(conn, posix_acl, mode)) == -1)
3873 goto done;
3874
3875 ret = SMB_VFS_SYS_ACL_SET_FILE(conn, to, SMB_ACL_TYPE_ACCESS, posix_acl);
3876
3877 done:
3878
3879 SMB_VFS_SYS_ACL_FREE_ACL(conn, posix_acl);
3880 return ret;
3881 }
3882
3883 /****************************************************************************
3884 Do a chmod by setting the ACL USER_OBJ, GROUP_OBJ and OTHER bits in an ACL
3885 and set the mask to rwx. Needed to preserve complex ACLs set by NT.
3886 Note that name is in UNIX character set.
3887 ****************************************************************************/
3888
3889 int chmod_acl(connection_struct *conn, const char *name, mode_t mode)
3890 {
3891 return copy_access_posix_acl(conn, name, name, mode);
3892 }
3893
3894 /****************************************************************************
3895 Check for an existing default POSIX ACL on a directory.
3896 ****************************************************************************/
3897
3898 static bool directory_has_default_posix_acl(connection_struct *conn, const char *fname)
3899 {
3900 SMB_ACL_T def_acl = SMB_VFS_SYS_ACL_GET_FILE( conn, fname, SMB_ACL_TYPE_DEFAULT);
3901 bool has_acl = False;
3902 SMB_ACL_ENTRY_T entry;
3903
3904 if (def_acl != NULL && (SMB_VFS_SYS_ACL_GET_ENTRY(conn, def_acl, SMB_ACL_FIRST_ENTRY, &entry) == 1)) {
3905 has_acl = True;
3906 }
3907
3908 if (def_acl) {
3909 SMB_VFS_SYS_ACL_FREE_ACL(conn, def_acl);
3910 }
3911 return has_acl;
3912 }
3913
3914 /****************************************************************************
3915 If the parent directory has no default ACL but it does have an Access ACL,
3916 inherit this Access ACL to file name.
3917 ****************************************************************************/
3918
3919 int inherit_access_posix_acl(connection_struct *conn, const char *inherit_from_dir,
3920 const char *name, mode_t mode)
3921 {
3922 if (directory_has_default_posix_acl(conn, inherit_from_dir))
3923 return 0;
3924
3925 return copy_access_posix_acl(conn, inherit_from_dir, name, mode);
3926 }
3927
3928 /****************************************************************************
3929 Do an fchmod by setting the ACL USER_OBJ, GROUP_OBJ and OTHER bits in an ACL
3930 and set the mask to rwx. Needed to preserve complex ACLs set by NT.
3931 ****************************************************************************/
3932
3933 int fchmod_acl(files_struct *fsp, mode_t mode)
3934 {
3935 connection_struct *conn = fsp->conn;
3936 SMB_ACL_T posix_acl = NULL;
3937 int ret = -1;
3938
3939 if ((posix_acl = SMB_VFS_SYS_ACL_GET_FD(fsp)) == NULL)
3940 return -1;
3941
3942 if ((ret = chmod_acl_internals(conn, posix_acl, mode)) == -1)
3943 goto done;
3944
3945 ret = SMB_VFS_SYS_ACL_SET_FD(fsp, posix_acl);
3946
3947 done:
3948
3949 SMB_VFS_SYS_ACL_FREE_ACL(conn, posix_acl);
3950 return ret;
3951 }
3952
3953 /****************************************************************************
3954 Map from wire type to permset.
3955 ****************************************************************************/
3956
3957 static bool unix_ex_wire_to_permset(connection_struct *conn, unsigned char wire_perm, SMB_ACL_PERMSET_T *p_permset)
3958 {
3959 if (wire_perm & ~(SMB_POSIX_ACL_READ|SMB_POSIX_ACL_WRITE|SMB_POSIX_ACL_EXECUTE)) {
3960 return False;
3961 }
3962
3963 if (SMB_VFS_SYS_ACL_CLEAR_PERMS(conn, *p_permset) == -1) {
3964 return False;
3965 }
3966
3967 if (wire_perm & SMB_POSIX_ACL_READ) {
3968 if (SMB_VFS_SYS_ACL_ADD_PERM(conn, *p_permset, SMB_ACL_READ) == -1) {
3969 return False;
3970 }
3971 }
3972 if (wire_perm & SMB_POSIX_ACL_WRITE) {
3973 if (SMB_VFS_SYS_ACL_ADD_PERM(conn, *p_permset, SMB_ACL_WRITE) == -1) {
3974 return False;
3975 }
3976 }
3977 if (wire_perm & SMB_POSIX_ACL_EXECUTE) {
3978 if (SMB_VFS_SYS_ACL_ADD_PERM(conn, *p_permset, SMB_ACL_EXECUTE) == -1) {
3979 return False;
3980 }
3981 }
3982 return True;
3983 }
3984
3985 /****************************************************************************
3986 Map from wire type to tagtype.
3987 ****************************************************************************/
3988
3989 static bool unix_ex_wire_to_tagtype(unsigned char wire_tt, SMB_ACL_TAG_T *p_tt)
3990 {
3991 switch (wire_tt) {
3992 case SMB_POSIX_ACL_USER_OBJ:
3993 *p_tt = SMB_ACL_USER_OBJ;
3994 break;
3995 case SMB_POSIX_ACL_USER:
3996 *p_tt = SMB_ACL_USER;
3997 break;
3998 case SMB_POSIX_ACL_GROUP_OBJ:
3999 *p_tt = SMB_ACL_GROUP_OBJ;
4000 break;
4001 case SMB_POSIX_ACL_GROUP:
4002 *p_tt = SMB_ACL_GROUP;
4003 break;
4004 case SMB_POSIX_ACL_MASK:
4005 *p_tt = SMB_ACL_MASK;
4006 break;
4007 case SMB_POSIX_ACL_OTHER:
4008 *p_tt = SMB_ACL_OTHER;
4009 break;
4010 default:
4011 return False;
4012 }
4013 return True;
4014 }
4015
4016 /****************************************************************************
4017 Create a new POSIX acl from wire permissions.
4018 FIXME ! How does the share mask/mode fit into this.... ?
4019 ****************************************************************************/
4020
4021 static SMB_ACL_T create_posix_acl_from_wire(connection_struct *conn, uint16 num_acls, const char *pdata)
4022 {
4023 unsigned int i;
4024 SMB_ACL_T the_acl = SMB_VFS_SYS_ACL_INIT(conn, num_acls);
4025
4026 if (the_acl == NULL) {
4027 return NULL;
4028 }
4029
4030 for (i = 0; i < num_acls; i++) {
4031 SMB_ACL_ENTRY_T the_entry;
4032 SMB_ACL_PERMSET_T the_permset;
4033 SMB_ACL_TAG_T tag_type;
4034
4035 if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &the_acl, &the_entry) == -1) {
4036 DEBUG(0,("create_posix_acl_from_wire: Failed to create entry %u. (%s)\n",
4037 i, strerror(errno) ));
4038 goto fail;
4039 }
4040
4041 if (!unix_ex_wire_to_tagtype(CVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)), &tag_type)) {
4042 DEBUG(0,("create_posix_acl_from_wire: invalid wire tagtype %u on entry %u.\n",
4043 CVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)), i ));
4044 goto fail;
4045 }
4046
4047 if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, the_entry, tag_type) == -1) {
4048 DEBUG(0,("create_posix_acl_from_wire: Failed to set tagtype on entry %u. (%s)\n",
4049 i, strerror(errno) ));
4050 goto fail;
4051 }
4052
4053 /* Get the permset pointer from the new ACL entry. */
4054 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, the_entry, &the_permset) == -1) {
4055 DEBUG(0,("create_posix_acl_from_wire: Failed to get permset on entry %u. (%s)\n",
4056 i, strerror(errno) ));
4057 goto fail;
4058 }
4059
4060 /* Map from wire to permissions. */
4061 if (!unix_ex_wire_to_permset(conn, CVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)+1), &the_permset)) {
4062 DEBUG(0,("create_posix_acl_from_wire: invalid permset %u on entry %u.\n",
4063 CVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE) + 1), i ));
4064 goto fail;
4065 }
4066
4067 /* Now apply to the new ACL entry. */
4068 if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, the_entry, the_permset) == -1) {
4069 DEBUG(0,("create_posix_acl_from_wire: Failed to add permset on entry %u. (%s)\n",
4070 i, strerror(errno) ));
4071 goto fail;
4072 }
4073
4074 if (tag_type == SMB_ACL_USER) {
4075 uint32 uidval = IVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)+2);
4076 uid_t uid = (uid_t)uidval;
4077 if (SMB_VFS_SYS_ACL_SET_QUALIFIER(conn, the_entry,(void *)&uid) == -1) {
4078 DEBUG(0,("create_posix_acl_from_wire: Failed to set uid %u on entry %u. (%s)\n",
4079 (unsigned int)uid, i, strerror(errno) ));
4080 goto fail;
4081 }
4082 }
4083
4084 if (tag_type == SMB_ACL_GROUP) {
4085 uint32 gidval = IVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)+2);
4086 gid_t gid = (uid_t)gidval;
4087 if (SMB_VFS_SYS_ACL_SET_QUALIFIER(conn, the_entry,(void *)&gid) == -1) {
4088 DEBUG(0,("create_posix_acl_from_wire: Failed to set gid %u on entry %u. (%s)\n",
4089 (unsigned int)gid, i, strerror(errno) ));
4090 goto fail;
4091 }
4092 }
4093 }
4094
4095 return the_acl;
4096
4097 fail:
4098
4099 if (the_acl != NULL) {
4100 SMB_VFS_SYS_ACL_FREE_ACL(conn, the_acl);
4101 }
4102 return NULL;
4103 }
4104
4105 /****************************************************************************
4106 Calls from UNIX extensions - Default POSIX ACL set.
4107 If num_def_acls == 0 and not a directory just return. If it is a directory
4108 and num_def_acls == 0 then remove the default acl. Else set the default acl
4109 on the directory.
4110 ****************************************************************************/
4111
4112 bool set_unix_posix_default_acl(connection_struct *conn, const char *fname, SMB_STRUCT_STAT *psbuf,
4113 uint16 num_def_acls, const char *pdata)
4114 {
4115 SMB_ACL_T def_acl = NULL;
4116
4117 if (!S_ISDIR(psbuf->st_mode)) {
4118 if (num_def_acls) {
4119 DEBUG(5,("set_unix_posix_default_acl: Can't set default ACL on non-directory file %s\n", fname ));
4120 errno = EISDIR;
4121 return False;
4122 } else {
4123 return True;
4124 }
4125 }
4126
4127 if (!num_def_acls) {
4128 /* Remove the default ACL. */
4129 if (SMB_VFS_SYS_ACL_DELETE_DEF_FILE(conn, fname) == -1) {
4130 DEBUG(5,("set_unix_posix_default_acl: acl_delete_def_file failed on directory %s (%s)\n",
4131 fname, strerror(errno) ));
4132 return False;
4133 }
4134 return True;
4135 }
4136
4137 if ((def_acl = create_posix_acl_from_wire(conn, num_def_acls, pdata)) == NULL) {
4138 return False;
4139 }
4140
4141 if (SMB_VFS_SYS_ACL_SET_FILE(conn, fname, SMB_ACL_TYPE_DEFAULT, def_acl) == -1) {
4142 DEBUG(5,("set_unix_posix_default_acl: acl_set_file failed on directory %s (%s)\n",
4143 fname, strerror(errno) ));
4144 SMB_VFS_SYS_ACL_FREE_ACL(conn, def_acl);
4145 return False;
4146 }
4147
4148 DEBUG(10,("set_unix_posix_default_acl: set default acl for file %s\n", fname ));
4149 SMB_VFS_SYS_ACL_FREE_ACL(conn, def_acl);
4150 return True;
4151 }
4152
4153 /****************************************************************************
4154 Remove an ACL from a file. As we don't have acl_delete_entry() available
4155 we must read the current acl and copy all entries except MASK, USER and GROUP
4156 to a new acl, then set that. This (at least on Linux) causes any ACL to be
4157 removed.
4158 FIXME ! How does the share mask/mode fit into this.... ?
4159 ****************************************************************************/
4160
4161 static bool remove_posix_acl(connection_struct *conn, files_struct *fsp, const char *fname)
4162 {
4163 SMB_ACL_T file_acl = NULL;
4164 int entry_id = SMB_ACL_FIRST_ENTRY;
4165 SMB_ACL_ENTRY_T entry;
4166 bool ret = False;
4167 /* Create a new ACL with only 3 entries, u/g/w. */
4168 SMB_ACL_T new_file_acl = SMB_VFS_SYS_ACL_INIT(conn, 3);
4169 SMB_ACL_ENTRY_T user_ent = NULL;
4170 SMB_ACL_ENTRY_T group_ent = NULL;
4171 SMB_ACL_ENTRY_T other_ent = NULL;
4172
4173 if (new_file_acl == NULL) {
4174 DEBUG(5,("remove_posix_acl: failed to init new ACL with 3 entries for file %s.\n", fname));
4175 return False;
4176 }
4177
4178 /* Now create the u/g/w entries. */
4179 if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &new_file_acl, &user_ent) == -1) {
4180 DEBUG(5,("remove_posix_acl: Failed to create user entry for file %s. (%s)\n",
4181 fname, strerror(errno) ));
4182 goto done;
4183 }
4184 if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, user_ent, SMB_ACL_USER_OBJ) == -1) {
4185 DEBUG(5,("remove_posix_acl: Failed to set user entry for file %s. (%s)\n",
4186 fname, strerror(errno) ));
4187 goto done;
4188 }
4189
4190 if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &new_file_acl, &group_ent) == -1) {
4191 DEBUG(5,("remove_posix_acl: Failed to create group entry for file %s. (%s)\n",
4192 fname, strerror(errno) ));
4193 goto done;
4194 }
4195 if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, group_ent, SMB_ACL_GROUP_OBJ) == -1) {
4196 DEBUG(5,("remove_posix_acl: Failed to set group entry for file %s. (%s)\n",
4197 fname, strerror(errno) ));
4198 goto done;
4199 }
4200
4201 if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &new_file_acl, &other_ent) == -1) {
4202 DEBUG(5,("remove_posix_acl: Failed to create other entry for file %s. (%s)\n",
4203 fname, strerror(errno) ));
4204 goto done;
4205 }
4206 if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, other_ent, SMB_ACL_OTHER) == -1) {
4207 DEBUG(5,("remove_posix_acl: Failed to set other entry for file %s. (%s)\n",
4208 fname, strerror(errno) ));
4209 goto done;
4210 }
4211
4212 /* Get the current file ACL. */
4213 if (fsp && fsp->fh->fd != -1) {
4214 file_acl = SMB_VFS_SYS_ACL_GET_FD(fsp);
4215 } else {
4216 file_acl = SMB_VFS_SYS_ACL_GET_FILE( conn, fname, SMB_ACL_TYPE_ACCESS);
4217 }
4218
4219 if (file_acl == NULL) {
4220 /* This is only returned if an error occurred. Even for a file with
4221 no acl a u/g/w acl should be returned. */
4222 DEBUG(5,("remove_posix_acl: failed to get ACL from file %s (%s).\n",
4223 fname, strerror(errno) ));
4224 goto done;
4225 }
4226
4227 while ( SMB_VFS_SYS_ACL_GET_ENTRY(conn, file_acl, entry_id, &entry) == 1) {
4228 SMB_ACL_TAG_T tagtype;
4229 SMB_ACL_PERMSET_T permset;
4230
4231 entry_id = SMB_ACL_NEXT_ENTRY;
4232
4233 if (SMB_VFS_SYS_ACL_GET_TAG_TYPE(conn, entry, &tagtype) == -1) {
4234 DEBUG(5,("remove_posix_acl: failed to get tagtype from ACL on file %s (%s).\n",
4235 fname, strerror(errno) ));
4236 goto done;
4237 }
4238
4239 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, entry, &permset) == -1) {
4240 DEBUG(5,("remove_posix_acl: failed to get permset from ACL on file %s (%s).\n",
4241 fname, strerror(errno) ));
4242 goto done;
4243 }
4244
4245 if (tagtype == SMB_ACL_USER_OBJ) {
4246 if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, user_ent, permset) == -1) {
4247 DEBUG(5,("remove_posix_acl: failed to set permset from ACL on file %s (%s).\n",
4248 fname, strerror(errno) ));
4249 }
4250 } else if (tagtype == SMB_ACL_GROUP_OBJ) {
4251 if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, group_ent, permset) == -1) {
4252 DEBUG(5,("remove_posix_acl: failed to set permset from ACL on file %s (%s).\n",
4253 fname, strerror(errno) ));
4254 }
4255 } else if (tagtype == SMB_ACL_OTHER) {
4256 if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, other_ent, permset) == -1) {
4257 DEBUG(5,("remove_posix_acl: failed to set permset from ACL on file %s (%s).\n",
4258 fname, strerror(errno) ));
4259 }
4260 }
4261 }
4262
4263 /* Set the new empty file ACL. */
4264 if (fsp && fsp->fh->fd != -1) {
4265 if (SMB_VFS_SYS_ACL_SET_FD(fsp, new_file_acl) == -1) {
4266 DEBUG(5,("remove_posix_acl: acl_set_file failed on %s (%s)\n",
4267 fname, strerror(errno) ));
4268 goto done;
4269 }
4270 } else {
4271 if (SMB_VFS_SYS_ACL_SET_FILE(conn, fname, SMB_ACL_TYPE_ACCESS, new_file_acl) == -1) {
4272 DEBUG(5,("remove_posix_acl: acl_set_file failed on %s (%s)\n",
4273 fname, strerror(errno) ));
4274 goto done;
4275 }
4276 }
4277
4278 ret = True;
4279
4280 done:
4281
4282 if (file_acl) {
4283 SMB_VFS_SYS_ACL_FREE_ACL(conn, file_acl);
4284 }
4285 if (new_file_acl) {
4286 SMB_VFS_SYS_ACL_FREE_ACL(conn, new_file_acl);
4287 }
4288 return ret;
4289 }
4290
4291 /****************************************************************************
4292 Calls from UNIX extensions - POSIX ACL set.
4293 If num_def_acls == 0 then read/modify/write acl after removing all entries
4294 except SMB_ACL_USER_OBJ, SMB_ACL_GROUP_OBJ, SMB_ACL_OTHER.
4295 ****************************************************************************/
4296
4297 bool set_unix_posix_acl(connection_struct *conn, files_struct *fsp, const char *fname, uint16 num_acls, const char *pdata)
4298 {
4299 SMB_ACL_T file_acl = NULL;
4300
4301 if (!num_acls) {
4302 /* Remove the ACL from the file. */
4303 return remove_posix_acl(conn, fsp, fname);
4304 }
4305
4306 if ((file_acl = create_posix_acl_from_wire(conn, num_acls, pdata)) == NULL) {
4307 return False;
4308 }
4309
4310 if (fsp && fsp->fh->fd != -1) {
4311 /* The preferred way - use an open fd. */
4312 if (SMB_VFS_SYS_ACL_SET_FD(fsp, file_acl) == -1) {
4313 DEBUG(5,("set_unix_posix_acl: acl_set_file failed on %s (%s)\n",
4314 fname, strerror(errno) ));
4315 SMB_VFS_SYS_ACL_FREE_ACL(conn, file_acl);
4316 return False;
4317 }
4318 } else {
4319 if (SMB_VFS_SYS_ACL_SET_FILE(conn, fname, SMB_ACL_TYPE_ACCESS, file_acl) == -1) {
4320 DEBUG(5,("set_unix_posix_acl: acl_set_file failed on %s (%s)\n",
4321 fname, strerror(errno) ));
4322 SMB_VFS_SYS_ACL_FREE_ACL(conn, file_acl);
4323 return False;
4324 }
4325 }
4326
4327 DEBUG(10,("set_unix_posix_acl: set acl for file %s\n", fname ));
4328 SMB_VFS_SYS_ACL_FREE_ACL(conn, file_acl);
4329 return True;
4330 }
4331
4332 /********************************************************************
4333 Pull the NT ACL from a file on disk or the OpenEventlog() access
4334 check. Caller is responsible for freeing the returned security
4335 descriptor via TALLOC_FREE(). This is designed for dealing with
4336 user space access checks in smbd outside of the VFS. For example,
4337 checking access rights in OpenEventlog().
4338
4339 Assume we are dealing with files (for now)
4340 ********************************************************************/
4341
4342 SEC_DESC *get_nt_acl_no_snum( TALLOC_CTX *ctx, const char *fname)
4343 {
4344 SEC_DESC *psd, *ret_sd;
4345 connection_struct *conn;
4346 files_struct finfo;
4347 struct fd_handle fh;
4348
4349 conn = TALLOC_ZERO_P(ctx, connection_struct);
4350 if (conn == NULL) {
4351 DEBUG(0, ("talloc failed\n"));
4352 return NULL;
4353 }
4354
4355 if (!(conn->params = TALLOC_P(conn, struct share_params))) {
4356 DEBUG(0,("get_nt_acl_no_snum: talloc() failed!\n"));
4357 TALLOC_FREE(conn);
4358 return NULL;
4359 }
4360
4361 conn->params->service = -1;
4362
4363 set_conn_connectpath(conn, "/");
4364
4365 if (!smbd_vfs_init(conn)) {
4366 DEBUG(0,("get_nt_acl_no_snum: Unable to create a fake connection struct!\n"));
4367 conn_free_internal( conn );
4368 return NULL;
4369 }
4370
4371 ZERO_STRUCT( finfo );
4372 ZERO_STRUCT( fh );
4373
4374 finfo.fnum = -1;
4375 finfo.conn = conn;
4376 finfo.fh = &fh;
4377 finfo.fh->fd = -1;
4378 finfo.fsp_name = CONST_DISCARD(char *,fname);
4379
4380 if (!NT_STATUS_IS_OK(SMB_VFS_FGET_NT_ACL( &finfo, DACL_SECURITY_INFORMATION, &psd))) {
4381 DEBUG(0,("get_nt_acl_no_snum: get_nt_acl returned zero.\n"));
4382 conn_free_internal( conn );
4383 return NULL;
4384 }
4385
4386 ret_sd = dup_sec_desc( ctx, psd );
4387
4388 conn_free_internal( conn );
4389
4390 return ret_sd;
4391 }
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