?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
Document default of the printing config variable.
[Samba/nascimento.git] / source3 / smbd / posix_acls.c
blob72f5c94bc542221541b8f8a0a8420f5ff6d7224f
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
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 3 of the License, or
10 (at your option) any later version.
11
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
16
17 You should have received a copy of the GNU General Public License
18 along with this program. If not, see <http://www.gnu.org/licenses/>.
19 */
20
21 #include "includes.h"
22
23 extern struct current_user current_user;
24 extern const struct generic_mapping file_generic_mapping;
25
26 #undef DBGC_CLASS
27 #define DBGC_CLASS DBGC_ACLS
28
29 /****************************************************************************
30 Data structures representing the internal ACE format.
31 ****************************************************************************/
32
33 enum ace_owner {UID_ACE, GID_ACE, WORLD_ACE};
34 enum ace_attribute {ALLOW_ACE, DENY_ACE}; /* Used for incoming NT ACLS. */
35
36 typedef union posix_id {
37 uid_t uid;
38 gid_t gid;
39 int world;
40 } posix_id;
41
42 typedef struct canon_ace {
43 struct canon_ace *next, *prev;
44 SMB_ACL_TAG_T type;
45 mode_t perms; /* Only use S_I(R|W|X)USR mode bits here. */
46 DOM_SID trustee;
47 enum ace_owner owner_type;
48 enum ace_attribute attr;
49 posix_id unix_ug;
50 bool inherited;
51 } canon_ace;
52
53 #define ALL_ACE_PERMS (S_IRUSR|S_IWUSR|S_IXUSR)
54
55 /*
56 * EA format of user.SAMBA_PAI (Samba_Posix_Acl_Interitance)
57 * attribute on disk.
58 *
59 * | 1 | 1 | 2 | 2 | ....
60 * +------+------+-------------+---------------------+-------------+--------------------+
61 * | vers | flag | num_entries | num_default_entries | ..entries.. | default_entries... |
62 * +------+------+-------------+---------------------+-------------+--------------------+
63 */
64
65 #define PAI_VERSION_OFFSET 0
66 #define PAI_FLAG_OFFSET 1
67 #define PAI_NUM_ENTRIES_OFFSET 2
68 #define PAI_NUM_DEFAULT_ENTRIES_OFFSET 4
69 #define PAI_ENTRIES_BASE 6
70
71 #define PAI_VERSION 1
72 #define PAI_ACL_FLAG_PROTECTED 0x1
73 #define PAI_ENTRY_LENGTH 5
74
75 /*
76 * In memory format of user.SAMBA_PAI attribute.
77 */
78
79 struct pai_entry {
80 struct pai_entry *next, *prev;
81 enum ace_owner owner_type;
82 posix_id unix_ug;
83 };
84
85 struct pai_val {
86 bool pai_protected;
87 unsigned int num_entries;
88 struct pai_entry *entry_list;
89 unsigned int num_def_entries;
90 struct pai_entry *def_entry_list;
91 };
92
93 /************************************************************************
94 Return a uint32 of the pai_entry principal.
95 ************************************************************************/
96
97 static uint32 get_pai_entry_val(struct pai_entry *paie)
98 {
99 switch (paie->owner_type) {
100 case UID_ACE:
101 DEBUG(10,("get_pai_entry_val: uid = %u\n", (unsigned int)paie->unix_ug.uid ));
102 return (uint32)paie->unix_ug.uid;
103 case GID_ACE:
104 DEBUG(10,("get_pai_entry_val: gid = %u\n", (unsigned int)paie->unix_ug.gid ));
105 return (uint32)paie->unix_ug.gid;
106 case WORLD_ACE:
107 default:
108 DEBUG(10,("get_pai_entry_val: world ace\n"));
109 return (uint32)-1;
110 }
111 }
112
113 /************************************************************************
114 Return a uint32 of the entry principal.
115 ************************************************************************/
116
117 static uint32 get_entry_val(canon_ace *ace_entry)
118 {
119 switch (ace_entry->owner_type) {
120 case UID_ACE:
121 DEBUG(10,("get_entry_val: uid = %u\n", (unsigned int)ace_entry->unix_ug.uid ));
122 return (uint32)ace_entry->unix_ug.uid;
123 case GID_ACE:
124 DEBUG(10,("get_entry_val: gid = %u\n", (unsigned int)ace_entry->unix_ug.gid ));
125 return (uint32)ace_entry->unix_ug.gid;
126 case WORLD_ACE:
127 default:
128 DEBUG(10,("get_entry_val: world ace\n"));
129 return (uint32)-1;
130 }
131 }
132
133 /************************************************************************
134 Count the inherited entries.
135 ************************************************************************/
136
137 static unsigned int num_inherited_entries(canon_ace *ace_list)
138 {
139 unsigned int num_entries = 0;
140
141 for (; ace_list; ace_list = ace_list->next)
142 if (ace_list->inherited)
143 num_entries++;
144 return num_entries;
145 }
146
147 /************************************************************************
148 Create the on-disk format. Caller must free.
149 ************************************************************************/
150
151 static char *create_pai_buf(canon_ace *file_ace_list, canon_ace *dir_ace_list, bool pai_protected, size_t *store_size)
152 {
153 char *pai_buf = NULL;
154 canon_ace *ace_list = NULL;
155 char *entry_offset = NULL;
156 unsigned int num_entries = 0;
157 unsigned int num_def_entries = 0;
158
159 for (ace_list = file_ace_list; ace_list; ace_list = ace_list->next)
160 if (ace_list->inherited)
161 num_entries++;
162
163 for (ace_list = dir_ace_list; ace_list; ace_list = ace_list->next)
164 if (ace_list->inherited)
165 num_def_entries++;
166
167 DEBUG(10,("create_pai_buf: num_entries = %u, num_def_entries = %u\n", num_entries, num_def_entries ));
168
169 *store_size = PAI_ENTRIES_BASE + ((num_entries + num_def_entries)*PAI_ENTRY_LENGTH);
170
171 pai_buf = (char *)SMB_MALLOC(*store_size);
172 if (!pai_buf) {
173 return NULL;
174 }
175
176 /* Set up the header. */
177 memset(pai_buf, '\0', PAI_ENTRIES_BASE);
178 SCVAL(pai_buf,PAI_VERSION_OFFSET,PAI_VERSION);
179 SCVAL(pai_buf,PAI_FLAG_OFFSET,(pai_protected ? PAI_ACL_FLAG_PROTECTED : 0));
180 SSVAL(pai_buf,PAI_NUM_ENTRIES_OFFSET,num_entries);
181 SSVAL(pai_buf,PAI_NUM_DEFAULT_ENTRIES_OFFSET,num_def_entries);
182
183 entry_offset = pai_buf + PAI_ENTRIES_BASE;
184
185 for (ace_list = file_ace_list; ace_list; ace_list = ace_list->next) {
186 if (ace_list->inherited) {
187 uint8 type_val = (unsigned char)ace_list->owner_type;
188 uint32 entry_val = get_entry_val(ace_list);
189
190 SCVAL(entry_offset,0,type_val);
191 SIVAL(entry_offset,1,entry_val);
192 entry_offset += PAI_ENTRY_LENGTH;
193 }
194 }
195
196 for (ace_list = dir_ace_list; ace_list; ace_list = ace_list->next) {
197 if (ace_list->inherited) {
198 uint8 type_val = (unsigned char)ace_list->owner_type;
199 uint32 entry_val = get_entry_val(ace_list);
200
201 SCVAL(entry_offset,0,type_val);
202 SIVAL(entry_offset,1,entry_val);
203 entry_offset += PAI_ENTRY_LENGTH;
204 }
205 }
206
207 return pai_buf;
208 }
209
210 /************************************************************************
211 Store the user.SAMBA_PAI attribute on disk.
212 ************************************************************************/
213
214 static void store_inheritance_attributes(files_struct *fsp, canon_ace *file_ace_list,
215 canon_ace *dir_ace_list, bool pai_protected)
216 {
217 int ret;
218 size_t store_size;
219 char *pai_buf;
220
221 if (!lp_map_acl_inherit(SNUM(fsp->conn)))
222 return;
223
224 /*
225 * Don't store if this ACL isn't protected and
226 * none of the entries in it are marked as inherited.
227 */
228
229 if (!pai_protected && num_inherited_entries(file_ace_list) == 0 && num_inherited_entries(dir_ace_list) == 0) {
230 /* Instead just remove the attribute if it exists. */
231 if (fsp->fh->fd != -1)
232 SMB_VFS_FREMOVEXATTR(fsp, SAMBA_POSIX_INHERITANCE_EA_NAME);
233 else
234 SMB_VFS_REMOVEXATTR(fsp->conn, fsp->fsp_name, SAMBA_POSIX_INHERITANCE_EA_NAME);
235 return;
236 }
237
238 pai_buf = create_pai_buf(file_ace_list, dir_ace_list, pai_protected, &store_size);
239
240 if (fsp->fh->fd != -1)
241 ret = SMB_VFS_FSETXATTR(fsp, SAMBA_POSIX_INHERITANCE_EA_NAME,
242 pai_buf, store_size, 0);
243 else
244 ret = SMB_VFS_SETXATTR(fsp->conn,fsp->fsp_name, SAMBA_POSIX_INHERITANCE_EA_NAME,
245 pai_buf, store_size, 0);
246
247 SAFE_FREE(pai_buf);
248
249 DEBUG(10,("store_inheritance_attribute:%s for file %s\n", pai_protected ? " (protected)" : "", fsp->fsp_name));
250 if (ret == -1 && !no_acl_syscall_error(errno))
251 DEBUG(1,("store_inheritance_attribute: Error %s\n", strerror(errno) ));
252 }
253
254 /************************************************************************
255 Delete the in memory inheritance info.
256 ************************************************************************/
257
258 static void free_inherited_info(struct pai_val *pal)
259 {
260 if (pal) {
261 struct pai_entry *paie, *paie_next;
262 for (paie = pal->entry_list; paie; paie = paie_next) {
263 paie_next = paie->next;
264 SAFE_FREE(paie);
265 }
266 for (paie = pal->def_entry_list; paie; paie = paie_next) {
267 paie_next = paie->next;
268 SAFE_FREE(paie);
269 }
270 SAFE_FREE(pal);
271 }
272 }
273
274 /************************************************************************
275 Was this ACL protected ?
276 ************************************************************************/
277
278 static bool get_protected_flag(struct pai_val *pal)
279 {
280 if (!pal)
281 return False;
282 return pal->pai_protected;
283 }
284
285 /************************************************************************
286 Was this ACE inherited ?
287 ************************************************************************/
288
289 static bool get_inherited_flag(struct pai_val *pal, canon_ace *ace_entry, bool default_ace)
290 {
291 struct pai_entry *paie;
292
293 if (!pal)
294 return False;
295
296 /* If the entry exists it is inherited. */
297 for (paie = (default_ace ? pal->def_entry_list : pal->entry_list); paie; paie = paie->next) {
298 if (ace_entry->owner_type == paie->owner_type &&
299 get_entry_val(ace_entry) == get_pai_entry_val(paie))
300 return True;
301 }
302 return False;
303 }
304
305 /************************************************************************
306 Ensure an attribute just read is valid.
307 ************************************************************************/
308
309 static bool check_pai_ok(char *pai_buf, size_t pai_buf_data_size)
310 {
311 uint16 num_entries;
312 uint16 num_def_entries;
313
314 if (pai_buf_data_size < PAI_ENTRIES_BASE) {
315 /* Corrupted - too small. */
316 return False;
317 }
318
319 if (CVAL(pai_buf,PAI_VERSION_OFFSET) != PAI_VERSION)
320 return False;
321
322 num_entries = SVAL(pai_buf,PAI_NUM_ENTRIES_OFFSET);
323 num_def_entries = SVAL(pai_buf,PAI_NUM_DEFAULT_ENTRIES_OFFSET);
324
325 /* Check the entry lists match. */
326 /* Each entry is 5 bytes (type plus 4 bytes of uid or gid). */
327
328 if (((num_entries + num_def_entries)*PAI_ENTRY_LENGTH) + PAI_ENTRIES_BASE != pai_buf_data_size)
329 return False;
330
331 return True;
332 }
333
334
335 /************************************************************************
336 Convert to in-memory format.
337 ************************************************************************/
338
339 static struct pai_val *create_pai_val(char *buf, size_t size)
340 {
341 char *entry_offset;
342 struct pai_val *paiv = NULL;
343 int i;
344
345 if (!check_pai_ok(buf, size))
346 return NULL;
347
348 paiv = SMB_MALLOC_P(struct pai_val);
349 if (!paiv)
350 return NULL;
351
352 memset(paiv, '\0', sizeof(struct pai_val));
353
354 paiv->pai_protected = (CVAL(buf,PAI_FLAG_OFFSET) == PAI_ACL_FLAG_PROTECTED);
355
356 paiv->num_entries = SVAL(buf,PAI_NUM_ENTRIES_OFFSET);
357 paiv->num_def_entries = SVAL(buf,PAI_NUM_DEFAULT_ENTRIES_OFFSET);
358
359 entry_offset = buf + PAI_ENTRIES_BASE;
360
361 DEBUG(10,("create_pai_val:%s num_entries = %u, num_def_entries = %u\n",
362 paiv->pai_protected ? " (pai_protected)" : "", paiv->num_entries, paiv->num_def_entries ));
363
364 for (i = 0; i < paiv->num_entries; i++) {
365 struct pai_entry *paie;
366
367 paie = SMB_MALLOC_P(struct pai_entry);
368 if (!paie) {
369 free_inherited_info(paiv);
370 return NULL;
371 }
372
373 paie->owner_type = (enum ace_owner)CVAL(entry_offset,0);
374 switch( paie->owner_type) {
375 case UID_ACE:
376 paie->unix_ug.uid = (uid_t)IVAL(entry_offset,1);
377 DEBUG(10,("create_pai_val: uid = %u\n", (unsigned int)paie->unix_ug.uid ));
378 break;
379 case GID_ACE:
380 paie->unix_ug.gid = (gid_t)IVAL(entry_offset,1);
381 DEBUG(10,("create_pai_val: gid = %u\n", (unsigned int)paie->unix_ug.gid ));
382 break;
383 case WORLD_ACE:
384 paie->unix_ug.world = -1;
385 DEBUG(10,("create_pai_val: world ace\n"));
386 break;
387 default:
388 free_inherited_info(paiv);
389 return NULL;
390 }
391 entry_offset += PAI_ENTRY_LENGTH;
392 DLIST_ADD(paiv->entry_list, paie);
393 }
394
395 for (i = 0; i < paiv->num_def_entries; i++) {
396 struct pai_entry *paie;
397
398 paie = SMB_MALLOC_P(struct pai_entry);
399 if (!paie) {
400 free_inherited_info(paiv);
401 return NULL;
402 }
403
404 paie->owner_type = (enum ace_owner)CVAL(entry_offset,0);
405 switch( paie->owner_type) {
406 case UID_ACE:
407 paie->unix_ug.uid = (uid_t)IVAL(entry_offset,1);
408 DEBUG(10,("create_pai_val: (def) uid = %u\n", (unsigned int)paie->unix_ug.uid ));
409 break;
410 case GID_ACE:
411 paie->unix_ug.gid = (gid_t)IVAL(entry_offset,1);
412 DEBUG(10,("create_pai_val: (def) gid = %u\n", (unsigned int)paie->unix_ug.gid ));
413 break;
414 case WORLD_ACE:
415 paie->unix_ug.world = -1;
416 DEBUG(10,("create_pai_val: (def) world ace\n"));
417 break;
418 default:
419 free_inherited_info(paiv);
420 return NULL;
421 }
422 entry_offset += PAI_ENTRY_LENGTH;
423 DLIST_ADD(paiv->def_entry_list, paie);
424 }
425
426 return paiv;
427 }
428
429 /************************************************************************
430 Load the user.SAMBA_PAI attribute.
431 ************************************************************************/
432
433 static struct pai_val *fload_inherited_info(files_struct *fsp)
434 {
435 char *pai_buf;
436 size_t pai_buf_size = 1024;
437 struct pai_val *paiv = NULL;
438 ssize_t ret;
439
440 if (!lp_map_acl_inherit(SNUM(fsp->conn)))
441 return NULL;
442
443 if ((pai_buf = (char *)SMB_MALLOC(pai_buf_size)) == NULL)
444 return NULL;
445
446 do {
447 if (fsp->fh->fd != -1)
448 ret = SMB_VFS_FGETXATTR(fsp, SAMBA_POSIX_INHERITANCE_EA_NAME,
449 pai_buf, pai_buf_size);
450 else
451 ret = SMB_VFS_GETXATTR(fsp->conn,fsp->fsp_name,SAMBA_POSIX_INHERITANCE_EA_NAME,
452 pai_buf, pai_buf_size);
453
454 if (ret == -1) {
455 if (errno != ERANGE) {
456 break;
457 }
458 /* Buffer too small - enlarge it. */
459 pai_buf_size *= 2;
460 SAFE_FREE(pai_buf);
461 if (pai_buf_size > 1024*1024) {
462 return NULL; /* Limit malloc to 1mb. */
463 }
464 if ((pai_buf = (char *)SMB_MALLOC(pai_buf_size)) == NULL)
465 return NULL;
466 }
467 } while (ret == -1);
468
469 DEBUG(10,("load_inherited_info: ret = %lu for file %s\n", (unsigned long)ret, fsp->fsp_name));
470
471 if (ret == -1) {
472 /* No attribute or not supported. */
473 #if defined(ENOATTR)
474 if (errno != ENOATTR)
475 DEBUG(10,("load_inherited_info: Error %s\n", strerror(errno) ));
476 #else
477 if (errno != ENOSYS)
478 DEBUG(10,("load_inherited_info: Error %s\n", strerror(errno) ));
479 #endif
480 SAFE_FREE(pai_buf);
481 return NULL;
482 }
483
484 paiv = create_pai_val(pai_buf, ret);
485
486 if (paiv && paiv->pai_protected)
487 DEBUG(10,("load_inherited_info: ACL is protected for file %s\n", fsp->fsp_name));
488
489 SAFE_FREE(pai_buf);
490 return paiv;
491 }
492
493 /************************************************************************
494 Load the user.SAMBA_PAI attribute.
495 ************************************************************************/
496
497 static struct pai_val *load_inherited_info(const struct connection_struct *conn,
498 const char *fname)
499 {
500 char *pai_buf;
501 size_t pai_buf_size = 1024;
502 struct pai_val *paiv = NULL;
503 ssize_t ret;
504
505 if (!lp_map_acl_inherit(SNUM(conn))) {
506 return NULL;
507 }
508
509 if ((pai_buf = (char *)SMB_MALLOC(pai_buf_size)) == NULL) {
510 return NULL;
511 }
512
513 do {
514 ret = SMB_VFS_GETXATTR(conn, fname,
515 SAMBA_POSIX_INHERITANCE_EA_NAME,
516 pai_buf, pai_buf_size);
517
518 if (ret == -1) {
519 if (errno != ERANGE) {
520 break;
521 }
522 /* Buffer too small - enlarge it. */
523 pai_buf_size *= 2;
524 SAFE_FREE(pai_buf);
525 if (pai_buf_size > 1024*1024) {
526 return NULL; /* Limit malloc to 1mb. */
527 }
528 if ((pai_buf = (char *)SMB_MALLOC(pai_buf_size)) == NULL)
529 return NULL;
530 }
531 } while (ret == -1);
532
533 DEBUG(10,("load_inherited_info: ret = %lu for file %s\n", (unsigned long)ret, fname));
534
535 if (ret == -1) {
536 /* No attribute or not supported. */
537 #if defined(ENOATTR)
538 if (errno != ENOATTR)
539 DEBUG(10,("load_inherited_info: Error %s\n", strerror(errno) ));
540 #else
541 if (errno != ENOSYS)
542 DEBUG(10,("load_inherited_info: Error %s\n", strerror(errno) ));
543 #endif
544 SAFE_FREE(pai_buf);
545 return NULL;
546 }
547
548 paiv = create_pai_val(pai_buf, ret);
549
550 if (paiv && paiv->pai_protected) {
551 DEBUG(10,("load_inherited_info: ACL is protected for file %s\n", fname));
552 }
553
554 SAFE_FREE(pai_buf);
555 return paiv;
556 }
557
558 /****************************************************************************
559 Functions to manipulate the internal ACE format.
560 ****************************************************************************/
561
562 /****************************************************************************
563 Count a linked list of canonical ACE entries.
564 ****************************************************************************/
565
566 static size_t count_canon_ace_list( canon_ace *list_head )
567 {
568 size_t count = 0;
569 canon_ace *ace;
570
571 for (ace = list_head; ace; ace = ace->next)
572 count++;
573
574 return count;
575 }
576
577 /****************************************************************************
578 Free a linked list of canonical ACE entries.
579 ****************************************************************************/
580
581 static void free_canon_ace_list( canon_ace *list_head )
582 {
583 canon_ace *list, *next;
584
585 for (list = list_head; list; list = next) {
586 next = list->next;
587 DLIST_REMOVE(list_head, list);
588 SAFE_FREE(list);
589 }
590 }
591
592 /****************************************************************************
593 Function to duplicate a canon_ace entry.
594 ****************************************************************************/
595
596 static canon_ace *dup_canon_ace( canon_ace *src_ace)
597 {
598 canon_ace *dst_ace = SMB_MALLOC_P(canon_ace);
599
600 if (dst_ace == NULL)
601 return NULL;
602
603 *dst_ace = *src_ace;
604 dst_ace->prev = dst_ace->next = NULL;
605 return dst_ace;
606 }
607
608 /****************************************************************************
609 Print out a canon ace.
610 ****************************************************************************/
611
612 static void print_canon_ace(canon_ace *pace, int num)
613 {
614 dbgtext( "canon_ace index %d. Type = %s ", num, pace->attr == ALLOW_ACE ? "allow" : "deny" );
615 dbgtext( "SID = %s ", sid_string_dbg(&pace->trustee));
616 if (pace->owner_type == UID_ACE) {
617 const char *u_name = uidtoname(pace->unix_ug.uid);
618 dbgtext( "uid %u (%s) ", (unsigned int)pace->unix_ug.uid, u_name );
619 } else if (pace->owner_type == GID_ACE) {
620 char *g_name = gidtoname(pace->unix_ug.gid);
621 dbgtext( "gid %u (%s) ", (unsigned int)pace->unix_ug.gid, g_name );
622 } else
623 dbgtext( "other ");
624 switch (pace->type) {
625 case SMB_ACL_USER:
626 dbgtext( "SMB_ACL_USER ");
627 break;
628 case SMB_ACL_USER_OBJ:
629 dbgtext( "SMB_ACL_USER_OBJ ");
630 break;
631 case SMB_ACL_GROUP:
632 dbgtext( "SMB_ACL_GROUP ");
633 break;
634 case SMB_ACL_GROUP_OBJ:
635 dbgtext( "SMB_ACL_GROUP_OBJ ");
636 break;
637 case SMB_ACL_OTHER:
638 dbgtext( "SMB_ACL_OTHER ");
639 break;
640 default:
641 dbgtext( "MASK " );
642 break;
643 }
644 if (pace->inherited)
645 dbgtext( "(inherited) ");
646 dbgtext( "perms ");
647 dbgtext( "%c", pace->perms & S_IRUSR ? 'r' : '-');
648 dbgtext( "%c", pace->perms & S_IWUSR ? 'w' : '-');
649 dbgtext( "%c\n", pace->perms & S_IXUSR ? 'x' : '-');
650 }
651
652 /****************************************************************************
653 Print out a canon ace list.
654 ****************************************************************************/
655
656 static void print_canon_ace_list(const char *name, canon_ace *ace_list)
657 {
658 int count = 0;
659
660 if( DEBUGLVL( 10 )) {
661 dbgtext( "print_canon_ace_list: %s\n", name );
662 for (;ace_list; ace_list = ace_list->next, count++)
663 print_canon_ace(ace_list, count );
664 }
665 }
666
667 /****************************************************************************
668 Map POSIX ACL perms to canon_ace permissions (a mode_t containing only S_(R|W|X)USR bits).
669 ****************************************************************************/
670
671 static mode_t convert_permset_to_mode_t(connection_struct *conn, SMB_ACL_PERMSET_T permset)
672 {
673 mode_t ret = 0;
674
675 ret |= (SMB_VFS_SYS_ACL_GET_PERM(conn, permset, SMB_ACL_READ) ? S_IRUSR : 0);
676 ret |= (SMB_VFS_SYS_ACL_GET_PERM(conn, permset, SMB_ACL_WRITE) ? S_IWUSR : 0);
677 ret |= (SMB_VFS_SYS_ACL_GET_PERM(conn, permset, SMB_ACL_EXECUTE) ? S_IXUSR : 0);
678
679 return ret;
680 }
681
682 /****************************************************************************
683 Map generic UNIX permissions to canon_ace permissions (a mode_t containing only S_(R|W|X)USR bits).
684 ****************************************************************************/
685
686 static mode_t unix_perms_to_acl_perms(mode_t mode, int r_mask, int w_mask, int x_mask)
687 {
688 mode_t ret = 0;
689
690 if (mode & r_mask)
691 ret |= S_IRUSR;
692 if (mode & w_mask)
693 ret |= S_IWUSR;
694 if (mode & x_mask)
695 ret |= S_IXUSR;
696
697 return ret;
698 }
699
700 /****************************************************************************
701 Map canon_ace permissions (a mode_t containing only S_(R|W|X)USR bits) to
702 an SMB_ACL_PERMSET_T.
703 ****************************************************************************/
704
705 static int map_acl_perms_to_permset(connection_struct *conn, mode_t mode, SMB_ACL_PERMSET_T *p_permset)
706 {
707 if (SMB_VFS_SYS_ACL_CLEAR_PERMS(conn, *p_permset) == -1)
708 return -1;
709 if (mode & S_IRUSR) {
710 if (SMB_VFS_SYS_ACL_ADD_PERM(conn, *p_permset, SMB_ACL_READ) == -1)
711 return -1;
712 }
713 if (mode & S_IWUSR) {
714 if (SMB_VFS_SYS_ACL_ADD_PERM(conn, *p_permset, SMB_ACL_WRITE) == -1)
715 return -1;
716 }
717 if (mode & S_IXUSR) {
718 if (SMB_VFS_SYS_ACL_ADD_PERM(conn, *p_permset, SMB_ACL_EXECUTE) == -1)
719 return -1;
720 }
721 return 0;
722 }
723
724 /****************************************************************************
725 Function to create owner and group SIDs from a SMB_STRUCT_STAT.
726 ****************************************************************************/
727
728 void create_file_sids(const SMB_STRUCT_STAT *psbuf, DOM_SID *powner_sid, DOM_SID *pgroup_sid)
729 {
730 uid_to_sid( powner_sid, psbuf->st_uid );
731 gid_to_sid( pgroup_sid, psbuf->st_gid );
732 }
733
734 /****************************************************************************
735 Is the identity in two ACEs equal ? Check both SID and uid/gid.
736 ****************************************************************************/
737
738 static bool identity_in_ace_equal(canon_ace *ace1, canon_ace *ace2)
739 {
740 if (sid_equal(&ace1->trustee, &ace2->trustee)) {
741 return True;
742 }
743 if (ace1->owner_type == ace2->owner_type) {
744 if (ace1->owner_type == UID_ACE &&
745 ace1->unix_ug.uid == ace2->unix_ug.uid) {
746 return True;
747 } else if (ace1->owner_type == GID_ACE &&
748 ace1->unix_ug.gid == ace2->unix_ug.gid) {
749 return True;
750 }
751 }
752 return False;
753 }
754
755 /****************************************************************************
756 Merge aces with a common sid - if both are allow or deny, OR the permissions together and
757 delete the second one. If the first is deny, mask the permissions off and delete the allow
758 if the permissions become zero, delete the deny if the permissions are non zero.
759 ****************************************************************************/
760
761 static void merge_aces( canon_ace **pp_list_head )
762 {
763 canon_ace *list_head = *pp_list_head;
764 canon_ace *curr_ace_outer;
765 canon_ace *curr_ace_outer_next;
766
767 /*
768 * First, merge allow entries with identical SIDs, and deny entries
769 * with identical SIDs.
770 */
771
772 for (curr_ace_outer = list_head; curr_ace_outer; curr_ace_outer = curr_ace_outer_next) {
773 canon_ace *curr_ace;
774 canon_ace *curr_ace_next;
775
776 curr_ace_outer_next = curr_ace_outer->next; /* Save the link in case we delete. */
777
778 for (curr_ace = curr_ace_outer->next; curr_ace; curr_ace = curr_ace_next) {
779
780 curr_ace_next = curr_ace->next; /* Save the link in case of delete. */
781
782 if (identity_in_ace_equal(curr_ace, curr_ace_outer) &&
783 (curr_ace->attr == curr_ace_outer->attr)) {
784
785 if( DEBUGLVL( 10 )) {
786 dbgtext("merge_aces: Merging ACE's\n");
787 print_canon_ace( curr_ace_outer, 0);
788 print_canon_ace( curr_ace, 0);
789 }
790
791 /* Merge two allow or two deny ACE's. */
792
793 curr_ace_outer->perms |= curr_ace->perms;
794 DLIST_REMOVE(list_head, curr_ace);
795 SAFE_FREE(curr_ace);
796 curr_ace_outer_next = curr_ace_outer->next; /* We may have deleted the link. */
797 }
798 }
799 }
800
801 /*
802 * Now go through and mask off allow permissions with deny permissions.
803 * We can delete either the allow or deny here as we know that each SID
804 * appears only once in the list.
805 */
806
807 for (curr_ace_outer = list_head; curr_ace_outer; curr_ace_outer = curr_ace_outer_next) {
808 canon_ace *curr_ace;
809 canon_ace *curr_ace_next;
810
811 curr_ace_outer_next = curr_ace_outer->next; /* Save the link in case we delete. */
812
813 for (curr_ace = curr_ace_outer->next; curr_ace; curr_ace = curr_ace_next) {
814
815 curr_ace_next = curr_ace->next; /* Save the link in case of delete. */
816
817 /*
818 * Subtract ACE's with different entries. Due to the ordering constraints
819 * we've put on the ACL, we know the deny must be the first one.
820 */
821
822 if (identity_in_ace_equal(curr_ace, curr_ace_outer) &&
823 (curr_ace_outer->attr == DENY_ACE) && (curr_ace->attr == ALLOW_ACE)) {
824
825 if( DEBUGLVL( 10 )) {
826 dbgtext("merge_aces: Masking ACE's\n");
827 print_canon_ace( curr_ace_outer, 0);
828 print_canon_ace( curr_ace, 0);
829 }
830
831 curr_ace->perms &= ~curr_ace_outer->perms;
832
833 if (curr_ace->perms == 0) {
834
835 /*
836 * The deny overrides the allow. Remove the allow.
837 */
838
839 DLIST_REMOVE(list_head, curr_ace);
840 SAFE_FREE(curr_ace);
841 curr_ace_outer_next = curr_ace_outer->next; /* We may have deleted the link. */
842
843 } else {
844
845 /*
846 * Even after removing permissions, there
847 * are still allow permissions - delete the deny.
848 * It is safe to delete the deny here,
849 * as we are guarenteed by the deny first
850 * ordering that all the deny entries for
851 * this SID have already been merged into one
852 * before we can get to an allow ace.
853 */
854
855 DLIST_REMOVE(list_head, curr_ace_outer);
856 SAFE_FREE(curr_ace_outer);
857 break;
858 }
859 }
860
861 } /* end for curr_ace */
862 } /* end for curr_ace_outer */
863
864 /* We may have modified the list. */
865
866 *pp_list_head = list_head;
867 }
868
869 /****************************************************************************
870 Check if we need to return NT4.x compatible ACL entries.
871 ****************************************************************************/
872
873 bool nt4_compatible_acls(void)
874 {
875 int compat = lp_acl_compatibility();
876
877 if (compat == ACL_COMPAT_AUTO) {
878 enum remote_arch_types ra_type = get_remote_arch();
879
880 /* Automatically adapt to client */
881 return (ra_type <= RA_WINNT);
882 } else
883 return (compat == ACL_COMPAT_WINNT);
884 }
885
886
887 /****************************************************************************
888 Map canon_ace perms to permission bits NT.
889 The attr element is not used here - we only process deny entries on set,
890 not get. Deny entries are implicit on get with ace->perms = 0.
891 ****************************************************************************/
892
893 static uint32_t map_canon_ace_perms(int snum,
894 enum security_ace_type *pacl_type,
895 mode_t perms,
896 bool directory_ace)
897 {
898 uint32_t nt_mask = 0;
899
900 *pacl_type = SEC_ACE_TYPE_ACCESS_ALLOWED;
901
902 if (lp_acl_map_full_control(snum) && ((perms & ALL_ACE_PERMS) == ALL_ACE_PERMS)) {
903 if (directory_ace) {
904 nt_mask = UNIX_DIRECTORY_ACCESS_RWX;
905 } else {
906 nt_mask = (UNIX_ACCESS_RWX & ~DELETE_ACCESS);
907 }
908 } else if ((perms & ALL_ACE_PERMS) == (mode_t)0) {
909 /*
910 * Windows NT refuses to display ACEs with no permissions in them (but
911 * they are perfectly legal with Windows 2000). If the ACE has empty
912 * permissions we cannot use 0, so we use the otherwise unused
913 * WRITE_OWNER permission, which we ignore when we set an ACL.
914 * We abstract this into a #define of UNIX_ACCESS_NONE to allow this
915 * to be changed in the future.
916 */
917
918 if (nt4_compatible_acls())
919 nt_mask = UNIX_ACCESS_NONE;
920 else
921 nt_mask = 0;
922 } else {
923 if (directory_ace) {
924 nt_mask |= ((perms & S_IRUSR) ? UNIX_DIRECTORY_ACCESS_R : 0 );
925 nt_mask |= ((perms & S_IWUSR) ? UNIX_DIRECTORY_ACCESS_W : 0 );
926 nt_mask |= ((perms & S_IXUSR) ? UNIX_DIRECTORY_ACCESS_X : 0 );
927 } else {
928 nt_mask |= ((perms & S_IRUSR) ? UNIX_ACCESS_R : 0 );
929 nt_mask |= ((perms & S_IWUSR) ? UNIX_ACCESS_W : 0 );
930 nt_mask |= ((perms & S_IXUSR) ? UNIX_ACCESS_X : 0 );
931 }
932 }
933
934 DEBUG(10,("map_canon_ace_perms: Mapped (UNIX) %x to (NT) %x\n",
935 (unsigned int)perms, (unsigned int)nt_mask ));
936
937 return nt_mask;
938 }
939
940 /****************************************************************************
941 Map NT perms to a UNIX mode_t.
942 ****************************************************************************/
943
944 #define FILE_SPECIFIC_READ_BITS (FILE_READ_DATA|FILE_READ_EA|FILE_READ_ATTRIBUTES)
945 #define FILE_SPECIFIC_WRITE_BITS (FILE_WRITE_DATA|FILE_APPEND_DATA|FILE_WRITE_EA|FILE_WRITE_ATTRIBUTES)
946 #define FILE_SPECIFIC_EXECUTE_BITS (FILE_EXECUTE)
947
948 static mode_t map_nt_perms( uint32 *mask, int type)
949 {
950 mode_t mode = 0;
951
952 switch(type) {
953 case S_IRUSR:
954 if((*mask) & GENERIC_ALL_ACCESS)
955 mode = S_IRUSR|S_IWUSR|S_IXUSR;
956 else {
957 mode |= ((*mask) & (GENERIC_READ_ACCESS|FILE_SPECIFIC_READ_BITS)) ? S_IRUSR : 0;
958 mode |= ((*mask) & (GENERIC_WRITE_ACCESS|FILE_SPECIFIC_WRITE_BITS)) ? S_IWUSR : 0;
959 mode |= ((*mask) & (GENERIC_EXECUTE_ACCESS|FILE_SPECIFIC_EXECUTE_BITS)) ? S_IXUSR : 0;
960 }
961 break;
962 case S_IRGRP:
963 if((*mask) & GENERIC_ALL_ACCESS)
964 mode = S_IRGRP|S_IWGRP|S_IXGRP;
965 else {
966 mode |= ((*mask) & (GENERIC_READ_ACCESS|FILE_SPECIFIC_READ_BITS)) ? S_IRGRP : 0;
967 mode |= ((*mask) & (GENERIC_WRITE_ACCESS|FILE_SPECIFIC_WRITE_BITS)) ? S_IWGRP : 0;
968 mode |= ((*mask) & (GENERIC_EXECUTE_ACCESS|FILE_SPECIFIC_EXECUTE_BITS)) ? S_IXGRP : 0;
969 }
970 break;
971 case S_IROTH:
972 if((*mask) & GENERIC_ALL_ACCESS)
973 mode = S_IROTH|S_IWOTH|S_IXOTH;
974 else {
975 mode |= ((*mask) & (GENERIC_READ_ACCESS|FILE_SPECIFIC_READ_BITS)) ? S_IROTH : 0;
976 mode |= ((*mask) & (GENERIC_WRITE_ACCESS|FILE_SPECIFIC_WRITE_BITS)) ? S_IWOTH : 0;
977 mode |= ((*mask) & (GENERIC_EXECUTE_ACCESS|FILE_SPECIFIC_EXECUTE_BITS)) ? S_IXOTH : 0;
978 }
979 break;
980 }
981
982 return mode;
983 }
984
985 /****************************************************************************
986 Unpack a SEC_DESC into a UNIX owner and group.
987 ****************************************************************************/
988
989 NTSTATUS unpack_nt_owners(int snum, uid_t *puser, gid_t *pgrp, uint32 security_info_sent, const SEC_DESC *psd)
990 {
991 DOM_SID owner_sid;
992 DOM_SID grp_sid;
993
994 *puser = (uid_t)-1;
995 *pgrp = (gid_t)-1;
996
997 if(security_info_sent == 0) {
998 DEBUG(0,("unpack_nt_owners: no security info sent !\n"));
999 return NT_STATUS_OK;
1000 }
1001
1002 /*
1003 * Validate the owner and group SID's.
1004 */
1005
1006 memset(&owner_sid, '\0', sizeof(owner_sid));
1007 memset(&grp_sid, '\0', sizeof(grp_sid));
1008
1009 DEBUG(5,("unpack_nt_owners: validating owner_sids.\n"));
1010
1011 /*
1012 * Don't immediately fail if the owner sid cannot be validated.
1013 * This may be a group chown only set.
1014 */
1015
1016 if (security_info_sent & OWNER_SECURITY_INFORMATION) {
1017 sid_copy(&owner_sid, psd->owner_sid);
1018 if (!sid_to_uid(&owner_sid, puser)) {
1019 if (lp_force_unknown_acl_user(snum)) {
1020 /* this allows take ownership to work
1021 * reasonably */
1022 *puser = current_user.ut.uid;
1023 } else {
1024 DEBUG(3,("unpack_nt_owners: unable to validate"
1025 " owner sid for %s\n",
1026 sid_string_dbg(&owner_sid)));
1027 return NT_STATUS_INVALID_OWNER;
1028 }
1029 }
1030 DEBUG(3,("unpack_nt_owners: owner sid mapped to uid %u\n",
1031 (unsigned int)*puser ));
1032 }
1033
1034 /*
1035 * Don't immediately fail if the group sid cannot be validated.
1036 * This may be an owner chown only set.
1037 */
1038
1039 if (security_info_sent & GROUP_SECURITY_INFORMATION) {
1040 sid_copy(&grp_sid, psd->group_sid);
1041 if (!sid_to_gid( &grp_sid, pgrp)) {
1042 if (lp_force_unknown_acl_user(snum)) {
1043 /* this allows take group ownership to work
1044 * reasonably */
1045 *pgrp = current_user.ut.gid;
1046 } else {
1047 DEBUG(3,("unpack_nt_owners: unable to validate"
1048 " group sid.\n"));
1049 return NT_STATUS_INVALID_OWNER;
1050 }
1051 }
1052 DEBUG(3,("unpack_nt_owners: group sid mapped to gid %u\n",
1053 (unsigned int)*pgrp));
1054 }
1055
1056 DEBUG(5,("unpack_nt_owners: owner_sids validated.\n"));
1057
1058 return NT_STATUS_OK;
1059 }
1060
1061 /****************************************************************************
1062 Ensure the enforced permissions for this share apply.
1063 ****************************************************************************/
1064
1065 static void apply_default_perms(const struct share_params *params,
1066 const bool is_directory, canon_ace *pace,
1067 mode_t type)
1068 {
1069 mode_t and_bits = (mode_t)0;
1070 mode_t or_bits = (mode_t)0;
1071
1072 /* Get the initial bits to apply. */
1073
1074 if (is_directory) {
1075 and_bits = lp_dir_security_mask(params->service);
1076 or_bits = lp_force_dir_security_mode(params->service);
1077 } else {
1078 and_bits = lp_security_mask(params->service);
1079 or_bits = lp_force_security_mode(params->service);
1080 }
1081
1082 /* Now bounce them into the S_USR space. */
1083 switch(type) {
1084 case S_IRUSR:
1085 /* Ensure owner has read access. */
1086 pace->perms |= S_IRUSR;
1087 if (is_directory)
1088 pace->perms |= (S_IWUSR|S_IXUSR);
1089 and_bits = unix_perms_to_acl_perms(and_bits, S_IRUSR, S_IWUSR, S_IXUSR);
1090 or_bits = unix_perms_to_acl_perms(or_bits, S_IRUSR, S_IWUSR, S_IXUSR);
1091 break;
1092 case S_IRGRP:
1093 and_bits = unix_perms_to_acl_perms(and_bits, S_IRGRP, S_IWGRP, S_IXGRP);
1094 or_bits = unix_perms_to_acl_perms(or_bits, S_IRGRP, S_IWGRP, S_IXGRP);
1095 break;
1096 case S_IROTH:
1097 and_bits = unix_perms_to_acl_perms(and_bits, S_IROTH, S_IWOTH, S_IXOTH);
1098 or_bits = unix_perms_to_acl_perms(or_bits, S_IROTH, S_IWOTH, S_IXOTH);
1099 break;
1100 }
1101
1102 pace->perms = ((pace->perms & and_bits)|or_bits);
1103 }
1104
1105 /****************************************************************************
1106 Check if a given uid/SID is in a group gid/SID. This is probably very
1107 expensive and will need optimisation. A *lot* of optimisation :-). JRA.
1108 ****************************************************************************/
1109
1110 static bool uid_entry_in_group( canon_ace *uid_ace, canon_ace *group_ace )
1111 {
1112 const char *u_name = NULL;
1113
1114 /* "Everyone" always matches every uid. */
1115
1116 if (sid_equal(&group_ace->trustee, &global_sid_World))
1117 return True;
1118
1119 /* Assume that the current user is in the current group (force group) */
1120
1121 if (uid_ace->unix_ug.uid == current_user.ut.uid && group_ace->unix_ug.gid == current_user.ut.gid)
1122 return True;
1123
1124 /* u_name talloc'ed off tos. */
1125 u_name = uidtoname(uid_ace->unix_ug.uid);
1126 if (!u_name) {
1127 return False;
1128 }
1129 return user_in_group_sid(u_name, &group_ace->trustee);
1130 }
1131
1132 /****************************************************************************
1133 A well formed POSIX file or default ACL has at least 3 entries, a
1134 SMB_ACL_USER_OBJ, SMB_ACL_GROUP_OBJ, SMB_ACL_OTHER_OBJ.
1135 In addition, the owner must always have at least read access.
1136 When using this call on get_acl, the pst struct is valid and contains
1137 the mode of the file. When using this call on set_acl, the pst struct has
1138 been modified to have a mode containing the default for this file or directory
1139 type.
1140 ****************************************************************************/
1141
1142 static bool ensure_canon_entry_valid(canon_ace **pp_ace,
1143 const struct share_params *params,
1144 const bool is_directory,
1145 const DOM_SID *pfile_owner_sid,
1146 const DOM_SID *pfile_grp_sid,
1147 const SMB_STRUCT_STAT *pst,
1148 bool setting_acl)
1149 {
1150 canon_ace *pace;
1151 bool got_user = False;
1152 bool got_grp = False;
1153 bool got_other = False;
1154 canon_ace *pace_other = NULL;
1155
1156 for (pace = *pp_ace; pace; pace = pace->next) {
1157 if (pace->type == SMB_ACL_USER_OBJ) {
1158
1159 if (setting_acl)
1160 apply_default_perms(params, is_directory, pace, S_IRUSR);
1161 got_user = True;
1162
1163 } else if (pace->type == SMB_ACL_GROUP_OBJ) {
1164
1165 /*
1166 * Ensure create mask/force create mode is respected on set.
1167 */
1168
1169 if (setting_acl)
1170 apply_default_perms(params, is_directory, pace, S_IRGRP);
1171 got_grp = True;
1172
1173 } else if (pace->type == SMB_ACL_OTHER) {
1174
1175 /*
1176 * Ensure create mask/force create mode is respected on set.
1177 */
1178
1179 if (setting_acl)
1180 apply_default_perms(params, is_directory, pace, S_IROTH);
1181 got_other = True;
1182 pace_other = pace;
1183 }
1184 }
1185
1186 if (!got_user) {
1187 if ((pace = SMB_MALLOC_P(canon_ace)) == NULL) {
1188 DEBUG(0,("ensure_canon_entry_valid: malloc fail.\n"));
1189 return False;
1190 }
1191
1192 ZERO_STRUCTP(pace);
1193 pace->type = SMB_ACL_USER_OBJ;
1194 pace->owner_type = UID_ACE;
1195 pace->unix_ug.uid = pst->st_uid;
1196 pace->trustee = *pfile_owner_sid;
1197 pace->attr = ALLOW_ACE;
1198
1199 if (setting_acl) {
1200 /* See if the owning user is in any of the other groups in
1201 the ACE. If so, OR in the permissions from that group. */
1202
1203 bool group_matched = False;
1204 canon_ace *pace_iter;
1205
1206 for (pace_iter = *pp_ace; pace_iter; pace_iter = pace_iter->next) {
1207 if (pace_iter->type == SMB_ACL_GROUP_OBJ || pace_iter->type == SMB_ACL_GROUP) {
1208 if (uid_entry_in_group(pace, pace_iter)) {
1209 pace->perms |= pace_iter->perms;
1210 group_matched = True;
1211 }
1212 }
1213 }
1214
1215 /* If we only got an "everyone" perm, just use that. */
1216 if (!group_matched) {
1217 if (got_other)
1218 pace->perms = pace_other->perms;
1219 else
1220 pace->perms = 0;
1221 }
1222
1223 apply_default_perms(params, is_directory, pace, S_IRUSR);
1224 } else {
1225 pace->perms = unix_perms_to_acl_perms(pst->st_mode, S_IRUSR, S_IWUSR, S_IXUSR);
1226 }
1227
1228 DLIST_ADD(*pp_ace, pace);
1229 }
1230
1231 if (!got_grp) {
1232 if ((pace = SMB_MALLOC_P(canon_ace)) == NULL) {
1233 DEBUG(0,("ensure_canon_entry_valid: malloc fail.\n"));
1234 return False;
1235 }
1236
1237 ZERO_STRUCTP(pace);
1238 pace->type = SMB_ACL_GROUP_OBJ;
1239 pace->owner_type = GID_ACE;
1240 pace->unix_ug.uid = pst->st_gid;
1241 pace->trustee = *pfile_grp_sid;
1242 pace->attr = ALLOW_ACE;
1243 if (setting_acl) {
1244 /* If we only got an "everyone" perm, just use that. */
1245 if (got_other)
1246 pace->perms = pace_other->perms;
1247 else
1248 pace->perms = 0;
1249 apply_default_perms(params, is_directory, pace, S_IRGRP);
1250 } else {
1251 pace->perms = unix_perms_to_acl_perms(pst->st_mode, S_IRGRP, S_IWGRP, S_IXGRP);
1252 }
1253
1254 DLIST_ADD(*pp_ace, pace);
1255 }
1256
1257 if (!got_other) {
1258 if ((pace = SMB_MALLOC_P(canon_ace)) == NULL) {
1259 DEBUG(0,("ensure_canon_entry_valid: malloc fail.\n"));
1260 return False;
1261 }
1262
1263 ZERO_STRUCTP(pace);
1264 pace->type = SMB_ACL_OTHER;
1265 pace->owner_type = WORLD_ACE;
1266 pace->unix_ug.world = -1;
1267 pace->trustee = global_sid_World;
1268 pace->attr = ALLOW_ACE;
1269 if (setting_acl) {
1270 pace->perms = 0;
1271 apply_default_perms(params, is_directory, pace, S_IROTH);
1272 } else
1273 pace->perms = unix_perms_to_acl_perms(pst->st_mode, S_IROTH, S_IWOTH, S_IXOTH);
1274
1275 DLIST_ADD(*pp_ace, pace);
1276 }
1277
1278 return True;
1279 }
1280
1281 /****************************************************************************
1282 Check if a POSIX ACL has the required SMB_ACL_USER_OBJ and SMB_ACL_GROUP_OBJ entries.
1283 If it does not have them, check if there are any entries where the trustee is the
1284 file owner or the owning group, and map these to SMB_ACL_USER_OBJ and SMB_ACL_GROUP_OBJ.
1285 ****************************************************************************/
1286
1287 static void check_owning_objs(canon_ace *ace, DOM_SID *pfile_owner_sid, DOM_SID *pfile_grp_sid)
1288 {
1289 bool got_user_obj, got_group_obj;
1290 canon_ace *current_ace;
1291 int i, entries;
1292
1293 entries = count_canon_ace_list(ace);
1294 got_user_obj = False;
1295 got_group_obj = False;
1296
1297 for (i=0, current_ace = ace; i < entries; i++, current_ace = current_ace->next) {
1298 if (current_ace->type == SMB_ACL_USER_OBJ)
1299 got_user_obj = True;
1300 else if (current_ace->type == SMB_ACL_GROUP_OBJ)
1301 got_group_obj = True;
1302 }
1303 if (got_user_obj && got_group_obj) {
1304 DEBUG(10,("check_owning_objs: ACL had owning user/group entries.\n"));
1305 return;
1306 }
1307
1308 for (i=0, current_ace = ace; i < entries; i++, current_ace = current_ace->next) {
1309 if (!got_user_obj && current_ace->owner_type == UID_ACE &&
1310 sid_equal(&current_ace->trustee, pfile_owner_sid)) {
1311 current_ace->type = SMB_ACL_USER_OBJ;
1312 got_user_obj = True;
1313 }
1314 if (!got_group_obj && current_ace->owner_type == GID_ACE &&
1315 sid_equal(&current_ace->trustee, pfile_grp_sid)) {
1316 current_ace->type = SMB_ACL_GROUP_OBJ;
1317 got_group_obj = True;
1318 }
1319 }
1320 if (!got_user_obj)
1321 DEBUG(10,("check_owning_objs: ACL is missing an owner entry.\n"));
1322 if (!got_group_obj)
1323 DEBUG(10,("check_owning_objs: ACL is missing an owning group entry.\n"));
1324 }
1325
1326 /****************************************************************************
1327 Unpack a SEC_DESC into two canonical ace lists.
1328 ****************************************************************************/
1329
1330 static bool create_canon_ace_lists(files_struct *fsp,
1331 SMB_STRUCT_STAT *pst,
1332 DOM_SID *pfile_owner_sid,
1333 DOM_SID *pfile_grp_sid,
1334 canon_ace **ppfile_ace,
1335 canon_ace **ppdir_ace,
1336 const SEC_ACL *dacl)
1337 {
1338 bool all_aces_are_inherit_only = (fsp->is_directory ? True : False);
1339 canon_ace *file_ace = NULL;
1340 canon_ace *dir_ace = NULL;
1341 canon_ace *current_ace = NULL;
1342 bool got_dir_allow = False;
1343 bool got_file_allow = False;
1344 int i, j;
1345
1346 *ppfile_ace = NULL;
1347 *ppdir_ace = NULL;
1348
1349 /*
1350 * Convert the incoming ACL into a more regular form.
1351 */
1352
1353 for(i = 0; i < dacl->num_aces; i++) {
1354 SEC_ACE *psa = &dacl->aces[i];
1355
1356 if((psa->type != SEC_ACE_TYPE_ACCESS_ALLOWED) && (psa->type != SEC_ACE_TYPE_ACCESS_DENIED)) {
1357 DEBUG(3,("create_canon_ace_lists: unable to set anything but an ALLOW or DENY ACE.\n"));
1358 return False;
1359 }
1360
1361 if (nt4_compatible_acls()) {
1362 /*
1363 * The security mask may be UNIX_ACCESS_NONE which should map into
1364 * no permissions (we overload the WRITE_OWNER bit for this) or it
1365 * should be one of the ALL/EXECUTE/READ/WRITE bits. Arrange for this
1366 * to be so. Any other bits override the UNIX_ACCESS_NONE bit.
1367 */
1368
1369 /*
1370 * Convert GENERIC bits to specific bits.
1371 */
1372
1373 se_map_generic(&psa->access_mask, &file_generic_mapping);
1374
1375 psa->access_mask &= (UNIX_ACCESS_NONE|FILE_ALL_ACCESS);
1376
1377 if(psa->access_mask != UNIX_ACCESS_NONE)
1378 psa->access_mask &= ~UNIX_ACCESS_NONE;
1379 }
1380 }
1381
1382 /*
1383 * Deal with the fact that NT 4.x re-writes the canonical format
1384 * that we return for default ACLs. If a directory ACE is identical
1385 * to a inherited directory ACE then NT changes the bits so that the
1386 * first ACE is set to OI|IO and the second ACE for this SID is set
1387 * to CI. We need to repair this. JRA.
1388 */
1389
1390 for(i = 0; i < dacl->num_aces; i++) {
1391 SEC_ACE *psa1 = &dacl->aces[i];
1392
1393 for (j = i + 1; j < dacl->num_aces; j++) {
1394 SEC_ACE *psa2 = &dacl->aces[j];
1395
1396 if (psa1->access_mask != psa2->access_mask)
1397 continue;
1398
1399 if (!sid_equal(&psa1->trustee, &psa2->trustee))
1400 continue;
1401
1402 /*
1403 * Ok - permission bits and SIDs are equal.
1404 * Check if flags were re-written.
1405 */
1406
1407 if (psa1->flags & SEC_ACE_FLAG_INHERIT_ONLY) {
1408
1409 psa1->flags |= (psa2->flags & (SEC_ACE_FLAG_CONTAINER_INHERIT|SEC_ACE_FLAG_OBJECT_INHERIT));
1410 psa2->flags &= ~(SEC_ACE_FLAG_CONTAINER_INHERIT|SEC_ACE_FLAG_OBJECT_INHERIT);
1411
1412 } else if (psa2->flags & SEC_ACE_FLAG_INHERIT_ONLY) {
1413
1414 psa2->flags |= (psa1->flags & (SEC_ACE_FLAG_CONTAINER_INHERIT|SEC_ACE_FLAG_OBJECT_INHERIT));
1415 psa1->flags &= ~(SEC_ACE_FLAG_CONTAINER_INHERIT|SEC_ACE_FLAG_OBJECT_INHERIT);
1416
1417 }
1418 }
1419 }
1420
1421 for(i = 0; i < dacl->num_aces; i++) {
1422 SEC_ACE *psa = &dacl->aces[i];
1423
1424 /*
1425 * Create a cannon_ace entry representing this NT DACL ACE.
1426 */
1427
1428 if ((current_ace = SMB_MALLOC_P(canon_ace)) == NULL) {
1429 free_canon_ace_list(file_ace);
1430 free_canon_ace_list(dir_ace);
1431 DEBUG(0,("create_canon_ace_lists: malloc fail.\n"));
1432 return False;
1433 }
1434
1435 ZERO_STRUCTP(current_ace);
1436
1437 sid_copy(&current_ace->trustee, &psa->trustee);
1438
1439 /*
1440 * Try and work out if the SID is a user or group
1441 * as we need to flag these differently for POSIX.
1442 * Note what kind of a POSIX ACL this should map to.
1443 */
1444
1445 if( sid_equal(&current_ace->trustee, &global_sid_World)) {
1446 current_ace->owner_type = WORLD_ACE;
1447 current_ace->unix_ug.world = -1;
1448 current_ace->type = SMB_ACL_OTHER;
1449 } else if (sid_equal(&current_ace->trustee, &global_sid_Creator_Owner)) {
1450 current_ace->owner_type = UID_ACE;
1451 current_ace->unix_ug.uid = pst->st_uid;
1452 current_ace->type = SMB_ACL_USER_OBJ;
1453
1454 /*
1455 * The Creator Owner entry only specifies inheritable permissions,
1456 * never access permissions. WinNT doesn't always set the ACE to
1457 *INHERIT_ONLY, though.
1458 */
1459
1460 if (nt4_compatible_acls())
1461 psa->flags |= SEC_ACE_FLAG_INHERIT_ONLY;
1462 } else if (sid_equal(&current_ace->trustee, &global_sid_Creator_Group)) {
1463 current_ace->owner_type = GID_ACE;
1464 current_ace->unix_ug.gid = pst->st_gid;
1465 current_ace->type = SMB_ACL_GROUP_OBJ;
1466
1467 /*
1468 * The Creator Group entry only specifies inheritable permissions,
1469 * never access permissions. WinNT doesn't always set the ACE to
1470 *INHERIT_ONLY, though.
1471 */
1472 if (nt4_compatible_acls())
1473 psa->flags |= SEC_ACE_FLAG_INHERIT_ONLY;
1474
1475 } else if (sid_to_uid( &current_ace->trustee, &current_ace->unix_ug.uid)) {
1476 current_ace->owner_type = UID_ACE;
1477 /* If it's the owning user, this is a user_obj, not
1478 * a user. */
1479 if (current_ace->unix_ug.uid == pst->st_uid) {
1480 current_ace->type = SMB_ACL_USER_OBJ;
1481 } else {
1482 current_ace->type = SMB_ACL_USER;
1483 }
1484 } else if (sid_to_gid( &current_ace->trustee, &current_ace->unix_ug.gid)) {
1485 current_ace->owner_type = GID_ACE;
1486 /* If it's the primary group, this is a group_obj, not
1487 * a group. */
1488 if (current_ace->unix_ug.gid == pst->st_gid) {
1489 current_ace->type = SMB_ACL_GROUP_OBJ;
1490 } else {
1491 current_ace->type = SMB_ACL_GROUP;
1492 }
1493 } else {
1494 /*
1495 * Silently ignore map failures in non-mappable SIDs (NT Authority, BUILTIN etc).
1496 */
1497
1498 if (non_mappable_sid(&psa->trustee)) {
1499 DEBUG(10, ("create_canon_ace_lists: ignoring "
1500 "non-mappable SID %s\n",
1501 sid_string_dbg(&psa->trustee)));
1502 SAFE_FREE(current_ace);
1503 continue;
1504 }
1505
1506 free_canon_ace_list(file_ace);
1507 free_canon_ace_list(dir_ace);
1508 DEBUG(0, ("create_canon_ace_lists: unable to map SID "
1509 "%s to uid or gid.\n",
1510 sid_string_dbg(&current_ace->trustee)));
1511 SAFE_FREE(current_ace);
1512 return False;
1513 }
1514
1515 /*
1516 * Map the given NT permissions into a UNIX mode_t containing only
1517 * S_I(R|W|X)USR bits.
1518 */
1519
1520 current_ace->perms |= map_nt_perms( &psa->access_mask, S_IRUSR);
1521 current_ace->attr = (psa->type == SEC_ACE_TYPE_ACCESS_ALLOWED) ? ALLOW_ACE : DENY_ACE;
1522 current_ace->inherited = ((psa->flags & SEC_ACE_FLAG_INHERITED_ACE) ? True : False);
1523
1524 /*
1525 * Now add the created ace to either the file list, the directory
1526 * list, or both. We *MUST* preserve the order here (hence we use
1527 * DLIST_ADD_END) as NT ACLs are order dependent.
1528 */
1529
1530 if (fsp->is_directory) {
1531
1532 /*
1533 * We can only add to the default POSIX ACE list if the ACE is
1534 * designed to be inherited by both files and directories.
1535 */
1536
1537 if ((psa->flags & (SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT)) ==
1538 (SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT)) {
1539
1540 DLIST_ADD_END(dir_ace, current_ace, canon_ace *);
1541
1542 /*
1543 * Note if this was an allow ace. We can't process
1544 * any further deny ace's after this.
1545 */
1546
1547 if (current_ace->attr == ALLOW_ACE)
1548 got_dir_allow = True;
1549
1550 if ((current_ace->attr == DENY_ACE) && got_dir_allow) {
1551 DEBUG(0,("create_canon_ace_lists: malformed ACL in inheritable ACL ! \
1552 Deny entry after Allow entry. Failing to set on file %s.\n", fsp->fsp_name ));
1553 free_canon_ace_list(file_ace);
1554 free_canon_ace_list(dir_ace);
1555 return False;
1556 }
1557
1558 if( DEBUGLVL( 10 )) {
1559 dbgtext("create_canon_ace_lists: adding dir ACL:\n");
1560 print_canon_ace( current_ace, 0);
1561 }
1562
1563 /*
1564 * If this is not an inherit only ACE we need to add a duplicate
1565 * to the file acl.
1566 */
1567
1568 if (!(psa->flags & SEC_ACE_FLAG_INHERIT_ONLY)) {
1569 canon_ace *dup_ace = dup_canon_ace(current_ace);
1570
1571 if (!dup_ace) {
1572 DEBUG(0,("create_canon_ace_lists: malloc fail !\n"));
1573 free_canon_ace_list(file_ace);
1574 free_canon_ace_list(dir_ace);
1575 return False;
1576 }
1577
1578 /*
1579 * We must not free current_ace here as its
1580 * pointer is now owned by the dir_ace list.
1581 */
1582 current_ace = dup_ace;
1583 } else {
1584 /*
1585 * We must not free current_ace here as its
1586 * pointer is now owned by the dir_ace list.
1587 */
1588 current_ace = NULL;
1589 }
1590 }
1591 }
1592
1593 /*
1594 * Only add to the file ACL if not inherit only.
1595 */
1596
1597 if (current_ace && !(psa->flags & SEC_ACE_FLAG_INHERIT_ONLY)) {
1598 DLIST_ADD_END(file_ace, current_ace, canon_ace *);
1599
1600 /*
1601 * Note if this was an allow ace. We can't process
1602 * any further deny ace's after this.
1603 */
1604
1605 if (current_ace->attr == ALLOW_ACE)
1606 got_file_allow = True;
1607
1608 if ((current_ace->attr == DENY_ACE) && got_file_allow) {
1609 DEBUG(0,("create_canon_ace_lists: malformed ACL in file ACL ! \
1610 Deny entry after Allow entry. Failing to set on file %s.\n", fsp->fsp_name ));
1611 free_canon_ace_list(file_ace);
1612 free_canon_ace_list(dir_ace);
1613 return False;
1614 }
1615
1616 if( DEBUGLVL( 10 )) {
1617 dbgtext("create_canon_ace_lists: adding file ACL:\n");
1618 print_canon_ace( current_ace, 0);
1619 }
1620 all_aces_are_inherit_only = False;
1621 /*
1622 * We must not free current_ace here as its
1623 * pointer is now owned by the file_ace list.
1624 */
1625 current_ace = NULL;
1626 }
1627
1628 /*
1629 * Free if ACE was not added.
1630 */
1631
1632 SAFE_FREE(current_ace);
1633 }
1634
1635 if (fsp->is_directory && all_aces_are_inherit_only) {
1636 /*
1637 * Windows 2000 is doing one of these weird 'inherit acl'
1638 * traverses to conserve NTFS ACL resources. Just pretend
1639 * there was no DACL sent. JRA.
1640 */
1641
1642 DEBUG(10,("create_canon_ace_lists: Win2k inherit acl traverse. Ignoring DACL.\n"));
1643 free_canon_ace_list(file_ace);
1644 free_canon_ace_list(dir_ace);
1645 file_ace = NULL;
1646 dir_ace = NULL;
1647 } else {
1648 /*
1649 * Check if we have SMB_ACL_USER_OBJ and SMB_ACL_GROUP_OBJ entries in each
1650 * ACL. If we don't have them, check if any SMB_ACL_USER/SMB_ACL_GROUP
1651 * entries can be converted to *_OBJ. Usually we will already have these
1652 * entries in the Default ACL, and the Access ACL will not have them.
1653 */
1654 if (file_ace) {
1655 check_owning_objs(file_ace, pfile_owner_sid, pfile_grp_sid);
1656 }
1657 if (dir_ace) {
1658 check_owning_objs(dir_ace, pfile_owner_sid, pfile_grp_sid);
1659 }
1660 }
1661
1662 *ppfile_ace = file_ace;
1663 *ppdir_ace = dir_ace;
1664
1665 return True;
1666 }
1667
1668 /****************************************************************************
1669 ASCII art time again... JRA :-).
1670
1671 We have 4 cases to process when moving from an NT ACL to a POSIX ACL. Firstly,
1672 we insist the ACL is in canonical form (ie. all DENY entries preceede ALLOW
1673 entries). Secondly, the merge code has ensured that all duplicate SID entries for
1674 allow or deny have been merged, so the same SID can only appear once in the deny
1675 list or once in the allow list.
1676
1677 We then process as follows :
1678
1679 ---------------------------------------------------------------------------
1680 First pass - look for a Everyone DENY entry.
1681
1682 If it is deny all (rwx) trunate the list at this point.
1683 Else, walk the list from this point and use the deny permissions of this
1684 entry as a mask on all following allow entries. Finally, delete
1685 the Everyone DENY entry (we have applied it to everything possible).
1686
1687 In addition, in this pass we remove any DENY entries that have
1688 no permissions (ie. they are a DENY nothing).
1689 ---------------------------------------------------------------------------
1690 Second pass - only deal with deny user entries.
1691
1692 DENY user1 (perms XXX)
1693
1694 new_perms = 0
1695 for all following allow group entries where user1 is in group
1696 new_perms |= group_perms;
1697
1698 user1 entry perms = new_perms & ~ XXX;
1699
1700 Convert the deny entry to an allow entry with the new perms and
1701 push to the end of the list. Note if the user was in no groups
1702 this maps to a specific allow nothing entry for this user.
1703
1704 The common case from the NT ACL choser (userX deny all) is
1705 optimised so we don't do the group lookup - we just map to
1706 an allow nothing entry.
1707
1708 What we're doing here is inferring the allow permissions the
1709 person setting the ACE on user1 wanted by looking at the allow
1710 permissions on the groups the user is currently in. This will
1711 be a snapshot, depending on group membership but is the best
1712 we can do and has the advantage of failing closed rather than
1713 open.
1714 ---------------------------------------------------------------------------
1715 Third pass - only deal with deny group entries.
1716
1717 DENY group1 (perms XXX)
1718
1719 for all following allow user entries where user is in group1
1720 user entry perms = user entry perms & ~ XXX;
1721
1722 If there is a group Everyone allow entry with permissions YYY,
1723 convert the group1 entry to an allow entry and modify its
1724 permissions to be :
1725
1726 new_perms = YYY & ~ XXX
1727
1728 and push to the end of the list.
1729
1730 If there is no group Everyone allow entry then convert the
1731 group1 entry to a allow nothing entry and push to the end of the list.
1732
1733 Note that the common case from the NT ACL choser (groupX deny all)
1734 cannot be optimised here as we need to modify user entries who are
1735 in the group to change them to a deny all also.
1736
1737 What we're doing here is modifying the allow permissions of
1738 user entries (which are more specific in POSIX ACLs) to mask
1739 out the explicit deny set on the group they are in. This will
1740 be a snapshot depending on current group membership but is the
1741 best we can do and has the advantage of failing closed rather
1742 than open.
1743 ---------------------------------------------------------------------------
1744 Fourth pass - cope with cumulative permissions.
1745
1746 for all allow user entries, if there exists an allow group entry with
1747 more permissive permissions, and the user is in that group, rewrite the
1748 allow user permissions to contain both sets of permissions.
1749
1750 Currently the code for this is #ifdef'ed out as these semantics make
1751 no sense to me. JRA.
1752 ---------------------------------------------------------------------------
1753
1754 Note we *MUST* do the deny user pass first as this will convert deny user
1755 entries into allow user entries which can then be processed by the deny
1756 group pass.
1757
1758 The above algorithm took a *lot* of thinking about - hence this
1759 explaination :-). JRA.
1760 ****************************************************************************/
1761
1762 /****************************************************************************
1763 Process a canon_ace list entries. This is very complex code. We need
1764 to go through and remove the "deny" permissions from any allow entry that matches
1765 the id of this entry. We have already refused any NT ACL that wasn't in correct
1766 order (DENY followed by ALLOW). If any allow entry ends up with zero permissions,
1767 we just remove it (to fail safe). We have already removed any duplicate ace
1768 entries. Treat an "Everyone" DENY_ACE as a special case - use it to mask all
1769 allow entries.
1770 ****************************************************************************/
1771
1772 static void process_deny_list( canon_ace **pp_ace_list )
1773 {
1774 canon_ace *ace_list = *pp_ace_list;
1775 canon_ace *curr_ace = NULL;
1776 canon_ace *curr_ace_next = NULL;
1777
1778 /* Pass 1 above - look for an Everyone, deny entry. */
1779
1780 for (curr_ace = ace_list; curr_ace; curr_ace = curr_ace_next) {
1781 canon_ace *allow_ace_p;
1782
1783 curr_ace_next = curr_ace->next; /* So we can't lose the link. */
1784
1785 if (curr_ace->attr != DENY_ACE)
1786 continue;
1787
1788 if (curr_ace->perms == (mode_t)0) {
1789
1790 /* Deny nothing entry - delete. */
1791
1792 DLIST_REMOVE(ace_list, curr_ace);
1793 continue;
1794 }
1795
1796 if (!sid_equal(&curr_ace->trustee, &global_sid_World))
1797 continue;
1798
1799 /* JRATEST - assert. */
1800 SMB_ASSERT(curr_ace->owner_type == WORLD_ACE);
1801
1802 if (curr_ace->perms == ALL_ACE_PERMS) {
1803
1804 /*
1805 * Optimisation. This is a DENY_ALL to Everyone. Truncate the
1806 * list at this point including this entry.
1807 */
1808
1809 canon_ace *prev_entry = curr_ace->prev;
1810
1811 free_canon_ace_list( curr_ace );
1812 if (prev_entry)
1813 prev_entry->next = NULL;
1814 else {
1815 /* We deleted the entire list. */
1816 ace_list = NULL;
1817 }
1818 break;
1819 }
1820
1821 for (allow_ace_p = curr_ace->next; allow_ace_p; allow_ace_p = allow_ace_p->next) {
1822
1823 /*
1824 * Only mask off allow entries.
1825 */
1826
1827 if (allow_ace_p->attr != ALLOW_ACE)
1828 continue;
1829
1830 allow_ace_p->perms &= ~curr_ace->perms;
1831 }
1832
1833 /*
1834 * Now it's been applied, remove it.
1835 */
1836
1837 DLIST_REMOVE(ace_list, curr_ace);
1838 }
1839
1840 /* Pass 2 above - deal with deny user entries. */
1841
1842 for (curr_ace = ace_list; curr_ace; curr_ace = curr_ace_next) {
1843 mode_t new_perms = (mode_t)0;
1844 canon_ace *allow_ace_p;
1845
1846 curr_ace_next = curr_ace->next; /* So we can't lose the link. */
1847
1848 if (curr_ace->attr != DENY_ACE)
1849 continue;
1850
1851 if (curr_ace->owner_type != UID_ACE)
1852 continue;
1853
1854 if (curr_ace->perms == ALL_ACE_PERMS) {
1855
1856 /*
1857 * Optimisation - this is a deny everything to this user.
1858 * Convert to an allow nothing and push to the end of the list.
1859 */
1860
1861 curr_ace->attr = ALLOW_ACE;
1862 curr_ace->perms = (mode_t)0;
1863 DLIST_DEMOTE(ace_list, curr_ace, canon_ace *);
1864 continue;
1865 }
1866
1867 for (allow_ace_p = curr_ace->next; allow_ace_p; allow_ace_p = allow_ace_p->next) {
1868
1869 if (allow_ace_p->attr != ALLOW_ACE)
1870 continue;
1871
1872 /* We process GID_ACE and WORLD_ACE entries only. */
1873
1874 if (allow_ace_p->owner_type == UID_ACE)
1875 continue;
1876
1877 if (uid_entry_in_group( curr_ace, allow_ace_p))
1878 new_perms |= allow_ace_p->perms;
1879 }
1880
1881 /*
1882 * Convert to a allow entry, modify the perms and push to the end
1883 * of the list.
1884 */
1885
1886 curr_ace->attr = ALLOW_ACE;
1887 curr_ace->perms = (new_perms & ~curr_ace->perms);
1888 DLIST_DEMOTE(ace_list, curr_ace, canon_ace *);
1889 }
1890
1891 /* Pass 3 above - deal with deny group entries. */
1892
1893 for (curr_ace = ace_list; curr_ace; curr_ace = curr_ace_next) {
1894 canon_ace *allow_ace_p;
1895 canon_ace *allow_everyone_p = NULL;
1896
1897 curr_ace_next = curr_ace->next; /* So we can't lose the link. */
1898
1899 if (curr_ace->attr != DENY_ACE)
1900 continue;
1901
1902 if (curr_ace->owner_type != GID_ACE)
1903 continue;
1904
1905 for (allow_ace_p = curr_ace->next; allow_ace_p; allow_ace_p = allow_ace_p->next) {
1906
1907 if (allow_ace_p->attr != ALLOW_ACE)
1908 continue;
1909
1910 /* Store a pointer to the Everyone allow, if it exists. */
1911 if (allow_ace_p->owner_type == WORLD_ACE)
1912 allow_everyone_p = allow_ace_p;
1913
1914 /* We process UID_ACE entries only. */
1915
1916 if (allow_ace_p->owner_type != UID_ACE)
1917 continue;
1918
1919 /* Mask off the deny group perms. */
1920
1921 if (uid_entry_in_group( allow_ace_p, curr_ace))
1922 allow_ace_p->perms &= ~curr_ace->perms;
1923 }
1924
1925 /*
1926 * Convert the deny to an allow with the correct perms and
1927 * push to the end of the list.
1928 */
1929
1930 curr_ace->attr = ALLOW_ACE;
1931 if (allow_everyone_p)
1932 curr_ace->perms = allow_everyone_p->perms & ~curr_ace->perms;
1933 else
1934 curr_ace->perms = (mode_t)0;
1935 DLIST_DEMOTE(ace_list, curr_ace, canon_ace *);
1936 }
1937
1938 /* Doing this fourth pass allows Windows semantics to be layered
1939 * on top of POSIX semantics. I'm not sure if this is desirable.
1940 * For example, in W2K ACLs there is no way to say, "Group X no
1941 * access, user Y full access" if user Y is a member of group X.
1942 * This seems completely broken semantics to me.... JRA.
1943 */
1944
1945 #if 0
1946 /* Pass 4 above - deal with allow entries. */
1947
1948 for (curr_ace = ace_list; curr_ace; curr_ace = curr_ace_next) {
1949 canon_ace *allow_ace_p;
1950
1951 curr_ace_next = curr_ace->next; /* So we can't lose the link. */
1952
1953 if (curr_ace->attr != ALLOW_ACE)
1954 continue;
1955
1956 if (curr_ace->owner_type != UID_ACE)
1957 continue;
1958
1959 for (allow_ace_p = ace_list; allow_ace_p; allow_ace_p = allow_ace_p->next) {
1960
1961 if (allow_ace_p->attr != ALLOW_ACE)
1962 continue;
1963
1964 /* We process GID_ACE entries only. */
1965
1966 if (allow_ace_p->owner_type != GID_ACE)
1967 continue;
1968
1969 /* OR in the group perms. */
1970
1971 if (uid_entry_in_group( curr_ace, allow_ace_p))
1972 curr_ace->perms |= allow_ace_p->perms;
1973 }
1974 }
1975 #endif
1976
1977 *pp_ace_list = ace_list;
1978 }
1979
1980 /****************************************************************************
1981 Create a default mode that will be used if a security descriptor entry has
1982 no user/group/world entries.
1983 ****************************************************************************/
1984
1985 static mode_t create_default_mode(files_struct *fsp, bool interitable_mode)
1986 {
1987 int snum = SNUM(fsp->conn);
1988 mode_t and_bits = (mode_t)0;
1989 mode_t or_bits = (mode_t)0;
1990 mode_t mode = interitable_mode
1991 ? unix_mode( fsp->conn, FILE_ATTRIBUTE_ARCHIVE, fsp->fsp_name,
1992 NULL )
1993 : S_IRUSR;
1994
1995 if (fsp->is_directory)
1996 mode |= (S_IWUSR|S_IXUSR);
1997
1998 /*
1999 * Now AND with the create mode/directory mode bits then OR with the
2000 * force create mode/force directory mode bits.
2001 */
2002
2003 if (fsp->is_directory) {
2004 and_bits = lp_dir_security_mask(snum);
2005 or_bits = lp_force_dir_security_mode(snum);
2006 } else {
2007 and_bits = lp_security_mask(snum);
2008 or_bits = lp_force_security_mode(snum);
2009 }
2010
2011 return ((mode & and_bits)|or_bits);
2012 }
2013
2014 /****************************************************************************
2015 Unpack a SEC_DESC into two canonical ace lists. We don't depend on this
2016 succeeding.
2017 ****************************************************************************/
2018
2019 static bool unpack_canon_ace(files_struct *fsp,
2020 SMB_STRUCT_STAT *pst,
2021 DOM_SID *pfile_owner_sid,
2022 DOM_SID *pfile_grp_sid,
2023 canon_ace **ppfile_ace,
2024 canon_ace **ppdir_ace,
2025 uint32 security_info_sent,
2026 const SEC_DESC *psd)
2027 {
2028 canon_ace *file_ace = NULL;
2029 canon_ace *dir_ace = NULL;
2030
2031 *ppfile_ace = NULL;
2032 *ppdir_ace = NULL;
2033
2034 if(security_info_sent == 0) {
2035 DEBUG(0,("unpack_canon_ace: no security info sent !\n"));
2036 return False;
2037 }
2038
2039 /*
2040 * If no DACL then this is a chown only security descriptor.
2041 */
2042
2043 if(!(security_info_sent & DACL_SECURITY_INFORMATION) || !psd->dacl)
2044 return True;
2045
2046 /*
2047 * Now go through the DACL and create the canon_ace lists.
2048 */
2049
2050 if (!create_canon_ace_lists( fsp, pst, pfile_owner_sid, pfile_grp_sid,
2051 &file_ace, &dir_ace, psd->dacl))
2052 return False;
2053
2054 if ((file_ace == NULL) && (dir_ace == NULL)) {
2055 /* W2K traverse DACL set - ignore. */
2056 return True;
2057 }
2058
2059 /*
2060 * Go through the canon_ace list and merge entries
2061 * belonging to identical users of identical allow or deny type.
2062 * We can do this as all deny entries come first, followed by
2063 * all allow entries (we have mandated this before accepting this acl).
2064 */
2065
2066 print_canon_ace_list( "file ace - before merge", file_ace);
2067 merge_aces( &file_ace );
2068
2069 print_canon_ace_list( "dir ace - before merge", dir_ace);
2070 merge_aces( &dir_ace );
2071
2072 /*
2073 * NT ACLs are order dependent. Go through the acl lists and
2074 * process DENY entries by masking the allow entries.
2075 */
2076
2077 print_canon_ace_list( "file ace - before deny", file_ace);
2078 process_deny_list( &file_ace);
2079
2080 print_canon_ace_list( "dir ace - before deny", dir_ace);
2081 process_deny_list( &dir_ace);
2082
2083 /*
2084 * A well formed POSIX file or default ACL has at least 3 entries, a
2085 * SMB_ACL_USER_OBJ, SMB_ACL_GROUP_OBJ, SMB_ACL_OTHER_OBJ
2086 * and optionally a mask entry. Ensure this is the case.
2087 */
2088
2089 print_canon_ace_list( "file ace - before valid", file_ace);
2090
2091 /*
2092 * A default 3 element mode entry for a file should be r-- --- ---.
2093 * A default 3 element mode entry for a directory should be rwx --- ---.
2094 */
2095
2096 pst->st_mode = create_default_mode(fsp, False);
2097
2098 if (!ensure_canon_entry_valid(&file_ace, fsp->conn->params, fsp->is_directory, pfile_owner_sid, pfile_grp_sid, pst, True)) {
2099 free_canon_ace_list(file_ace);
2100 free_canon_ace_list(dir_ace);
2101 return False;
2102 }
2103
2104 print_canon_ace_list( "dir ace - before valid", dir_ace);
2105
2106 /*
2107 * A default inheritable 3 element mode entry for a directory should be the
2108 * mode Samba will use to create a file within. Ensure user rwx bits are set if
2109 * it's a directory.
2110 */
2111
2112 pst->st_mode = create_default_mode(fsp, True);
2113
2114 if (dir_ace && !ensure_canon_entry_valid(&dir_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( "file ace - return", file_ace);
2121 print_canon_ace_list( "dir ace - return", dir_ace);
2122
2123 *ppfile_ace = file_ace;
2124 *ppdir_ace = dir_ace;
2125 return True;
2126
2127 }
2128
2129 /******************************************************************************
2130 When returning permissions, try and fit NT display
2131 semantics if possible. Note the the canon_entries here must have been malloced.
2132 The list format should be - first entry = owner, followed by group and other user
2133 entries, last entry = other.
2134
2135 Note that this doesn't exactly match the NT semantics for an ACL. As POSIX entries
2136 are not ordered, and match on the most specific entry rather than walking a list,
2137 then a simple POSIX permission of rw-r--r-- should really map to 5 entries,
2138
2139 Entry 0: owner : deny all except read and write.
2140 Entry 1: owner : allow read and write.
2141 Entry 2: group : deny all except read.
2142 Entry 3: group : allow read.
2143 Entry 4: Everyone : allow read.
2144
2145 But NT cannot display this in their ACL editor !
2146 ********************************************************************************/
2147
2148 static void arrange_posix_perms(const char *filename, canon_ace **pp_list_head)
2149 {
2150 canon_ace *list_head = *pp_list_head;
2151 canon_ace *owner_ace = NULL;
2152 canon_ace *other_ace = NULL;
2153 canon_ace *ace = NULL;
2154
2155 for (ace = list_head; ace; ace = ace->next) {
2156 if (ace->type == SMB_ACL_USER_OBJ)
2157 owner_ace = ace;
2158 else if (ace->type == SMB_ACL_OTHER) {
2159 /* Last ace - this is "other" */
2160 other_ace = ace;
2161 }
2162 }
2163
2164 if (!owner_ace || !other_ace) {
2165 DEBUG(0,("arrange_posix_perms: Invalid POSIX permissions for file %s, missing owner or other.\n",
2166 filename ));
2167 return;
2168 }
2169
2170 /*
2171 * The POSIX algorithm applies to owner first, and other last,
2172 * so ensure they are arranged in this order.
2173 */
2174
2175 if (owner_ace) {
2176 DLIST_PROMOTE(list_head, owner_ace);
2177 }
2178
2179 if (other_ace) {
2180 DLIST_DEMOTE(list_head, other_ace, canon_ace *);
2181 }
2182
2183 /* We have probably changed the head of the list. */
2184
2185 *pp_list_head = list_head;
2186 }
2187
2188 /****************************************************************************
2189 Create a linked list of canonical ACE entries.
2190 ****************************************************************************/
2191
2192 static canon_ace *canonicalise_acl(struct connection_struct *conn,
2193 const char *fname, SMB_ACL_T posix_acl,
2194 const SMB_STRUCT_STAT *psbuf,
2195 const DOM_SID *powner, const DOM_SID *pgroup, struct pai_val *pal, SMB_ACL_TYPE_T the_acl_type)
2196 {
2197 mode_t acl_mask = (S_IRUSR|S_IWUSR|S_IXUSR);
2198 canon_ace *list_head = NULL;
2199 canon_ace *ace = NULL;
2200 canon_ace *next_ace = NULL;
2201 int entry_id = SMB_ACL_FIRST_ENTRY;
2202 SMB_ACL_ENTRY_T entry;
2203 size_t ace_count;
2204
2205 while ( posix_acl && (SMB_VFS_SYS_ACL_GET_ENTRY(conn, posix_acl, entry_id, &entry) == 1)) {
2206 SMB_ACL_TAG_T tagtype;
2207 SMB_ACL_PERMSET_T permset;
2208 DOM_SID sid;
2209 posix_id unix_ug;
2210 enum ace_owner owner_type;
2211
2212 entry_id = SMB_ACL_NEXT_ENTRY;
2213
2214 /* Is this a MASK entry ? */
2215 if (SMB_VFS_SYS_ACL_GET_TAG_TYPE(conn, entry, &tagtype) == -1)
2216 continue;
2217
2218 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, entry, &permset) == -1)
2219 continue;
2220
2221 /* Decide which SID to use based on the ACL type. */
2222 switch(tagtype) {
2223 case SMB_ACL_USER_OBJ:
2224 /* Get the SID from the owner. */
2225 sid_copy(&sid, powner);
2226 unix_ug.uid = psbuf->st_uid;
2227 owner_type = UID_ACE;
2228 break;
2229 case SMB_ACL_USER:
2230 {
2231 uid_t *puid = (uid_t *)SMB_VFS_SYS_ACL_GET_QUALIFIER(conn, entry);
2232 if (puid == NULL) {
2233 DEBUG(0,("canonicalise_acl: Failed to get uid.\n"));
2234 continue;
2235 }
2236 /*
2237 * A SMB_ACL_USER entry for the owner is shadowed by the
2238 * SMB_ACL_USER_OBJ entry and Windows also cannot represent
2239 * that entry, so we ignore it. We also don't create such
2240 * entries out of the blue when setting ACLs, so a get/set
2241 * cycle will drop them.
2242 */
2243 if (the_acl_type == SMB_ACL_TYPE_ACCESS && *puid == psbuf->st_uid) {
2244 SMB_VFS_SYS_ACL_FREE_QUALIFIER(conn, (void *)puid,tagtype);
2245 continue;
2246 }
2247 uid_to_sid( &sid, *puid);
2248 unix_ug.uid = *puid;
2249 owner_type = UID_ACE;
2250 SMB_VFS_SYS_ACL_FREE_QUALIFIER(conn, (void *)puid,tagtype);
2251 break;
2252 }
2253 case SMB_ACL_GROUP_OBJ:
2254 /* Get the SID from the owning group. */
2255 sid_copy(&sid, pgroup);
2256 unix_ug.gid = psbuf->st_gid;
2257 owner_type = GID_ACE;
2258 break;
2259 case SMB_ACL_GROUP:
2260 {
2261 gid_t *pgid = (gid_t *)SMB_VFS_SYS_ACL_GET_QUALIFIER(conn, entry);
2262 if (pgid == NULL) {
2263 DEBUG(0,("canonicalise_acl: Failed to get gid.\n"));
2264 continue;
2265 }
2266 gid_to_sid( &sid, *pgid);
2267 unix_ug.gid = *pgid;
2268 owner_type = GID_ACE;
2269 SMB_VFS_SYS_ACL_FREE_QUALIFIER(conn, (void *)pgid,tagtype);
2270 break;
2271 }
2272 case SMB_ACL_MASK:
2273 acl_mask = convert_permset_to_mode_t(conn, permset);
2274 continue; /* Don't count the mask as an entry. */
2275 case SMB_ACL_OTHER:
2276 /* Use the Everyone SID */
2277 sid = global_sid_World;
2278 unix_ug.world = -1;
2279 owner_type = WORLD_ACE;
2280 break;
2281 default:
2282 DEBUG(0,("canonicalise_acl: Unknown tagtype %u\n", (unsigned int)tagtype));
2283 continue;
2284 }
2285
2286 /*
2287 * Add this entry to the list.
2288 */
2289
2290 if ((ace = SMB_MALLOC_P(canon_ace)) == NULL)
2291 goto fail;
2292
2293 ZERO_STRUCTP(ace);
2294 ace->type = tagtype;
2295 ace->perms = convert_permset_to_mode_t(conn, permset);
2296 ace->attr = ALLOW_ACE;
2297 ace->trustee = sid;
2298 ace->unix_ug = unix_ug;
2299 ace->owner_type = owner_type;
2300 ace->inherited = get_inherited_flag(pal, ace, (the_acl_type == SMB_ACL_TYPE_DEFAULT));
2301
2302 DLIST_ADD(list_head, ace);
2303 }
2304
2305 /*
2306 * This next call will ensure we have at least a user/group/world set.
2307 */
2308
2309 if (!ensure_canon_entry_valid(&list_head, conn->params,
2310 S_ISDIR(psbuf->st_mode), powner, pgroup,
2311 psbuf, False))
2312 goto fail;
2313
2314 /*
2315 * Now go through the list, masking the permissions with the
2316 * acl_mask. Ensure all DENY Entries are at the start of the list.
2317 */
2318
2319 DEBUG(10,("canonicalise_acl: %s ace entries before arrange :\n", the_acl_type == SMB_ACL_TYPE_ACCESS ? "Access" : "Default" ));
2320
2321 for ( ace_count = 0, ace = list_head; ace; ace = next_ace, ace_count++) {
2322 next_ace = ace->next;
2323
2324 /* Masks are only applied to entries other than USER_OBJ and OTHER. */
2325 if (ace->type != SMB_ACL_OTHER && ace->type != SMB_ACL_USER_OBJ)
2326 ace->perms &= acl_mask;
2327
2328 if (ace->perms == 0) {
2329 DLIST_PROMOTE(list_head, ace);
2330 }
2331
2332 if( DEBUGLVL( 10 ) ) {
2333 print_canon_ace(ace, ace_count);
2334 }
2335 }
2336
2337 arrange_posix_perms(fname,&list_head );
2338
2339 print_canon_ace_list( "canonicalise_acl: ace entries after arrange", list_head );
2340
2341 return list_head;
2342
2343 fail:
2344
2345 free_canon_ace_list(list_head);
2346 return NULL;
2347 }
2348
2349 /****************************************************************************
2350 Check if the current user group list contains a given group.
2351 ****************************************************************************/
2352
2353 static bool current_user_in_group(gid_t gid)
2354 {
2355 int i;
2356
2357 for (i = 0; i < current_user.ut.ngroups; i++) {
2358 if (current_user.ut.groups[i] == gid) {
2359 return True;
2360 }
2361 }
2362
2363 return False;
2364 }
2365
2366 /****************************************************************************
2367 Should we override a deny ? Check 'acl group control' and 'dos filemode'.
2368 ****************************************************************************/
2369
2370 static bool acl_group_override(connection_struct *conn,
2371 gid_t prim_gid,
2372 const char *fname)
2373 {
2374 SMB_STRUCT_STAT sbuf;
2375
2376 if ((errno != EPERM) && (errno != EACCES)) {
2377 return false;
2378 }
2379
2380 /* file primary group == user primary or supplementary group */
2381 if (lp_acl_group_control(SNUM(conn)) &&
2382 current_user_in_group(prim_gid)) {
2383 return true;
2384 }
2385
2386 /* user has writeable permission */
2387 if (lp_dos_filemode(SNUM(conn)) &&
2388 can_write_to_file(conn, fname, &sbuf)) {
2389 return true;
2390 }
2391
2392 return false;
2393 }
2394
2395 /****************************************************************************
2396 Attempt to apply an ACL to a file or directory.
2397 ****************************************************************************/
2398
2399 static bool set_canon_ace_list(files_struct *fsp, canon_ace *the_ace, bool default_ace, gid_t prim_gid, bool *pacl_set_support)
2400 {
2401 connection_struct *conn = fsp->conn;
2402 bool ret = False;
2403 SMB_ACL_T the_acl = SMB_VFS_SYS_ACL_INIT(conn, (int)count_canon_ace_list(the_ace) + 1);
2404 canon_ace *p_ace;
2405 int i;
2406 SMB_ACL_ENTRY_T mask_entry;
2407 bool got_mask_entry = False;
2408 SMB_ACL_PERMSET_T mask_permset;
2409 SMB_ACL_TYPE_T the_acl_type = (default_ace ? SMB_ACL_TYPE_DEFAULT : SMB_ACL_TYPE_ACCESS);
2410 bool needs_mask = False;
2411 mode_t mask_perms = 0;
2412
2413 #if defined(POSIX_ACL_NEEDS_MASK)
2414 /* HP-UX always wants to have a mask (called "class" there). */
2415 needs_mask = True;
2416 #endif
2417
2418 if (the_acl == NULL) {
2419
2420 if (!no_acl_syscall_error(errno)) {
2421 /*
2422 * Only print this error message if we have some kind of ACL
2423 * support that's not working. Otherwise we would always get this.
2424 */
2425 DEBUG(0,("set_canon_ace_list: Unable to init %s ACL. (%s)\n",
2426 default_ace ? "default" : "file", strerror(errno) ));
2427 }
2428 *pacl_set_support = False;
2429 return False;
2430 }
2431
2432 if( DEBUGLVL( 10 )) {
2433 dbgtext("set_canon_ace_list: setting ACL:\n");
2434 for (i = 0, p_ace = the_ace; p_ace; p_ace = p_ace->next, i++ ) {
2435 print_canon_ace( p_ace, i);
2436 }
2437 }
2438
2439 for (i = 0, p_ace = the_ace; p_ace; p_ace = p_ace->next, i++ ) {
2440 SMB_ACL_ENTRY_T the_entry;
2441 SMB_ACL_PERMSET_T the_permset;
2442
2443 /*
2444 * ACLs only "need" an ACL_MASK entry if there are any named user or
2445 * named group entries. But if there is an ACL_MASK entry, it applies
2446 * to ACL_USER, ACL_GROUP, and ACL_GROUP_OBJ entries. Set the mask
2447 * so that it doesn't deny (i.e., mask off) any permissions.
2448 */
2449
2450 if (p_ace->type == SMB_ACL_USER || p_ace->type == SMB_ACL_GROUP) {
2451 needs_mask = True;
2452 mask_perms |= p_ace->perms;
2453 } else if (p_ace->type == SMB_ACL_GROUP_OBJ) {
2454 mask_perms |= p_ace->perms;
2455 }
2456
2457 /*
2458 * Get the entry for this ACE.
2459 */
2460
2461 if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &the_acl, &the_entry) == -1) {
2462 DEBUG(0,("set_canon_ace_list: Failed to create entry %d. (%s)\n",
2463 i, strerror(errno) ));
2464 goto fail;
2465 }
2466
2467 if (p_ace->type == SMB_ACL_MASK) {
2468 mask_entry = the_entry;
2469 got_mask_entry = True;
2470 }
2471
2472 /*
2473 * Ok - we now know the ACL calls should be working, don't
2474 * allow fallback to chmod.
2475 */
2476
2477 *pacl_set_support = True;
2478
2479 /*
2480 * Initialise the entry from the canon_ace.
2481 */
2482
2483 /*
2484 * First tell the entry what type of ACE this is.
2485 */
2486
2487 if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, the_entry, p_ace->type) == -1) {
2488 DEBUG(0,("set_canon_ace_list: Failed to set tag type on entry %d. (%s)\n",
2489 i, strerror(errno) ));
2490 goto fail;
2491 }
2492
2493 /*
2494 * Only set the qualifier (user or group id) if the entry is a user
2495 * or group id ACE.
2496 */
2497
2498 if ((p_ace->type == SMB_ACL_USER) || (p_ace->type == SMB_ACL_GROUP)) {
2499 if (SMB_VFS_SYS_ACL_SET_QUALIFIER(conn, the_entry,(void *)&p_ace->unix_ug.uid) == -1) {
2500 DEBUG(0,("set_canon_ace_list: Failed to set qualifier on entry %d. (%s)\n",
2501 i, strerror(errno) ));
2502 goto fail;
2503 }
2504 }
2505
2506 /*
2507 * Convert the mode_t perms in the canon_ace to a POSIX permset.
2508 */
2509
2510 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, the_entry, &the_permset) == -1) {
2511 DEBUG(0,("set_canon_ace_list: Failed to get permset on entry %d. (%s)\n",
2512 i, strerror(errno) ));
2513 goto fail;
2514 }
2515
2516 if (map_acl_perms_to_permset(conn, p_ace->perms, &the_permset) == -1) {
2517 DEBUG(0,("set_canon_ace_list: Failed to create permset for mode (%u) on entry %d. (%s)\n",
2518 (unsigned int)p_ace->perms, i, strerror(errno) ));
2519 goto fail;
2520 }
2521
2522 /*
2523 * ..and apply them to the entry.
2524 */
2525
2526 if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, the_entry, the_permset) == -1) {
2527 DEBUG(0,("set_canon_ace_list: Failed to add permset on entry %d. (%s)\n",
2528 i, strerror(errno) ));
2529 goto fail;
2530 }
2531
2532 if( DEBUGLVL( 10 ))
2533 print_canon_ace( p_ace, i);
2534
2535 }
2536
2537 if (needs_mask && !got_mask_entry) {
2538 if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &the_acl, &mask_entry) == -1) {
2539 DEBUG(0,("set_canon_ace_list: Failed to create mask entry. (%s)\n", strerror(errno) ));
2540 goto fail;
2541 }
2542
2543 if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, mask_entry, SMB_ACL_MASK) == -1) {
2544 DEBUG(0,("set_canon_ace_list: Failed to set tag type on mask entry. (%s)\n",strerror(errno) ));
2545 goto fail;
2546 }
2547
2548 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, mask_entry, &mask_permset) == -1) {
2549 DEBUG(0,("set_canon_ace_list: Failed to get mask permset. (%s)\n", strerror(errno) ));
2550 goto fail;
2551 }
2552
2553 if (map_acl_perms_to_permset(conn, S_IRUSR|S_IWUSR|S_IXUSR, &mask_permset) == -1) {
2554 DEBUG(0,("set_canon_ace_list: Failed to create mask permset. (%s)\n", strerror(errno) ));
2555 goto fail;
2556 }
2557
2558 if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, mask_entry, mask_permset) == -1) {
2559 DEBUG(0,("set_canon_ace_list: Failed to add mask permset. (%s)\n", strerror(errno) ));
2560 goto fail;
2561 }
2562 }
2563
2564 /*
2565 * Finally apply it to the file or directory.
2566 */
2567
2568 if(default_ace || fsp->is_directory || fsp->fh->fd == -1) {
2569 if (SMB_VFS_SYS_ACL_SET_FILE(conn, fsp->fsp_name, the_acl_type, the_acl) == -1) {
2570 /*
2571 * Some systems allow all the above calls and only fail with no ACL support
2572 * when attempting to apply the acl. HPUX with HFS is an example of this. JRA.
2573 */
2574 if (no_acl_syscall_error(errno)) {
2575 *pacl_set_support = False;
2576 }
2577
2578 if (acl_group_override(conn, prim_gid, fsp->fsp_name)) {
2579 int sret;
2580
2581 DEBUG(5,("set_canon_ace_list: acl group control on and current user in file %s primary group.\n",
2582 fsp->fsp_name ));
2583
2584 become_root();
2585 sret = SMB_VFS_SYS_ACL_SET_FILE(conn, fsp->fsp_name, the_acl_type, the_acl);
2586 unbecome_root();
2587 if (sret == 0) {
2588 ret = True;
2589 }
2590 }
2591
2592 if (ret == False) {
2593 DEBUG(2,("set_canon_ace_list: sys_acl_set_file type %s failed for file %s (%s).\n",
2594 the_acl_type == SMB_ACL_TYPE_DEFAULT ? "directory default" : "file",
2595 fsp->fsp_name, strerror(errno) ));
2596 goto fail;
2597 }
2598 }
2599 } else {
2600 if (SMB_VFS_SYS_ACL_SET_FD(fsp, the_acl) == -1) {
2601 /*
2602 * Some systems allow all the above calls and only fail with no ACL support
2603 * when attempting to apply the acl. HPUX with HFS is an example of this. JRA.
2604 */
2605 if (no_acl_syscall_error(errno)) {
2606 *pacl_set_support = False;
2607 }
2608
2609 if (acl_group_override(conn, prim_gid, fsp->fsp_name)) {
2610 int sret;
2611
2612 DEBUG(5,("set_canon_ace_list: acl group control on and current user in file %s primary group.\n",
2613 fsp->fsp_name ));
2614
2615 become_root();
2616 sret = SMB_VFS_SYS_ACL_SET_FD(fsp, the_acl);
2617 unbecome_root();
2618 if (sret == 0) {
2619 ret = True;
2620 }
2621 }
2622
2623 if (ret == False) {
2624 DEBUG(2,("set_canon_ace_list: sys_acl_set_file failed for file %s (%s).\n",
2625 fsp->fsp_name, strerror(errno) ));
2626 goto fail;
2627 }
2628 }
2629 }
2630
2631 ret = True;
2632
2633 fail:
2634
2635 if (the_acl != NULL) {
2636 SMB_VFS_SYS_ACL_FREE_ACL(conn, the_acl);
2637 }
2638
2639 return ret;
2640 }
2641
2642 /****************************************************************************
2643 Find a particular canon_ace entry.
2644 ****************************************************************************/
2645
2646 static struct canon_ace *canon_ace_entry_for(struct canon_ace *list, SMB_ACL_TAG_T type, posix_id *id)
2647 {
2648 while (list) {
2649 if (list->type == type && ((type != SMB_ACL_USER && type != SMB_ACL_GROUP) ||
2650 (type == SMB_ACL_USER && id && id->uid == list->unix_ug.uid) ||
2651 (type == SMB_ACL_GROUP && id && id->gid == list->unix_ug.gid)))
2652 break;
2653 list = list->next;
2654 }
2655 return list;
2656 }
2657
2658 /****************************************************************************
2659
2660 ****************************************************************************/
2661
2662 SMB_ACL_T free_empty_sys_acl(connection_struct *conn, SMB_ACL_T the_acl)
2663 {
2664 SMB_ACL_ENTRY_T entry;
2665
2666 if (!the_acl)
2667 return NULL;
2668 if (SMB_VFS_SYS_ACL_GET_ENTRY(conn, the_acl, SMB_ACL_FIRST_ENTRY, &entry) != 1) {
2669 SMB_VFS_SYS_ACL_FREE_ACL(conn, the_acl);
2670 return NULL;
2671 }
2672 return the_acl;
2673 }
2674
2675 /****************************************************************************
2676 Convert a canon_ace to a generic 3 element permission - if possible.
2677 ****************************************************************************/
2678
2679 #define MAP_PERM(p,mask,result) (((p) & (mask)) ? (result) : 0 )
2680
2681 static bool convert_canon_ace_to_posix_perms( files_struct *fsp, canon_ace *file_ace_list, mode_t *posix_perms)
2682 {
2683 int snum = SNUM(fsp->conn);
2684 size_t ace_count = count_canon_ace_list(file_ace_list);
2685 canon_ace *ace_p;
2686 canon_ace *owner_ace = NULL;
2687 canon_ace *group_ace = NULL;
2688 canon_ace *other_ace = NULL;
2689 mode_t and_bits;
2690 mode_t or_bits;
2691
2692 if (ace_count != 3) {
2693 DEBUG(3,("convert_canon_ace_to_posix_perms: Too many ACE entries for file %s to convert to \
2694 posix perms.\n", fsp->fsp_name ));
2695 return False;
2696 }
2697
2698 for (ace_p = file_ace_list; ace_p; ace_p = ace_p->next) {
2699 if (ace_p->owner_type == UID_ACE)
2700 owner_ace = ace_p;
2701 else if (ace_p->owner_type == GID_ACE)
2702 group_ace = ace_p;
2703 else if (ace_p->owner_type == WORLD_ACE)
2704 other_ace = ace_p;
2705 }
2706
2707 if (!owner_ace || !group_ace || !other_ace) {
2708 DEBUG(3,("convert_canon_ace_to_posix_perms: Can't get standard entries for file %s.\n",
2709 fsp->fsp_name ));
2710 return False;
2711 }
2712
2713 *posix_perms = (mode_t)0;
2714
2715 *posix_perms |= owner_ace->perms;
2716 *posix_perms |= MAP_PERM(group_ace->perms, S_IRUSR, S_IRGRP);
2717 *posix_perms |= MAP_PERM(group_ace->perms, S_IWUSR, S_IWGRP);
2718 *posix_perms |= MAP_PERM(group_ace->perms, S_IXUSR, S_IXGRP);
2719 *posix_perms |= MAP_PERM(other_ace->perms, S_IRUSR, S_IROTH);
2720 *posix_perms |= MAP_PERM(other_ace->perms, S_IWUSR, S_IWOTH);
2721 *posix_perms |= MAP_PERM(other_ace->perms, S_IXUSR, S_IXOTH);
2722
2723 /* The owner must have at least read access. */
2724
2725 *posix_perms |= S_IRUSR;
2726 if (fsp->is_directory)
2727 *posix_perms |= (S_IWUSR|S_IXUSR);
2728
2729 /* If requested apply the masks. */
2730
2731 /* Get the initial bits to apply. */
2732
2733 if (fsp->is_directory) {
2734 and_bits = lp_dir_security_mask(snum);
2735 or_bits = lp_force_dir_security_mode(snum);
2736 } else {
2737 and_bits = lp_security_mask(snum);
2738 or_bits = lp_force_security_mode(snum);
2739 }
2740
2741 *posix_perms = (((*posix_perms) & and_bits)|or_bits);
2742
2743 DEBUG(10,("convert_canon_ace_to_posix_perms: converted u=%o,g=%o,w=%o to perm=0%o for file %s.\n",
2744 (int)owner_ace->perms, (int)group_ace->perms, (int)other_ace->perms, (int)*posix_perms,
2745 fsp->fsp_name ));
2746
2747 return True;
2748 }
2749
2750 /****************************************************************************
2751 Incoming NT ACLs on a directory can be split into a default POSIX acl (CI|OI|IO) and
2752 a normal POSIX acl. Win2k needs these split acls re-merging into one ACL
2753 with CI|OI set so it is inherited and also applies to the directory.
2754 Based on code from "Jim McDonough" <jmcd@us.ibm.com>.
2755 ****************************************************************************/
2756
2757 static size_t merge_default_aces( SEC_ACE *nt_ace_list, size_t num_aces)
2758 {
2759 size_t i, j;
2760
2761 for (i = 0; i < num_aces; i++) {
2762 for (j = i+1; j < num_aces; j++) {
2763 uint32 i_flags_ni = (nt_ace_list[i].flags & ~SEC_ACE_FLAG_INHERITED_ACE);
2764 uint32 j_flags_ni = (nt_ace_list[j].flags & ~SEC_ACE_FLAG_INHERITED_ACE);
2765 bool i_inh = (nt_ace_list[i].flags & SEC_ACE_FLAG_INHERITED_ACE) ? True : False;
2766 bool j_inh = (nt_ace_list[j].flags & SEC_ACE_FLAG_INHERITED_ACE) ? True : False;
2767
2768 /* We know the lower number ACE's are file entries. */
2769 if ((nt_ace_list[i].type == nt_ace_list[j].type) &&
2770 (nt_ace_list[i].size == nt_ace_list[j].size) &&
2771 (nt_ace_list[i].access_mask == nt_ace_list[j].access_mask) &&
2772 sid_equal(&nt_ace_list[i].trustee, &nt_ace_list[j].trustee) &&
2773 (i_inh == j_inh) &&
2774 (i_flags_ni == 0) &&
2775 (j_flags_ni == (SEC_ACE_FLAG_OBJECT_INHERIT|
2776 SEC_ACE_FLAG_CONTAINER_INHERIT|
2777 SEC_ACE_FLAG_INHERIT_ONLY))) {
2778 /*
2779 * W2K wants to have access allowed zero access ACE's
2780 * at the end of the list. If the mask is zero, merge
2781 * the non-inherited ACE onto the inherited ACE.
2782 */
2783
2784 if (nt_ace_list[i].access_mask == 0) {
2785 nt_ace_list[j].flags = SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT|
2786 (i_inh ? SEC_ACE_FLAG_INHERITED_ACE : 0);
2787 if (num_aces - i - 1 > 0)
2788 memmove(&nt_ace_list[i], &nt_ace_list[i+1], (num_aces-i-1) *
2789 sizeof(SEC_ACE));
2790
2791 DEBUG(10,("merge_default_aces: Merging zero access ACE %u onto ACE %u.\n",
2792 (unsigned int)i, (unsigned int)j ));
2793 } else {
2794 /*
2795 * These are identical except for the flags.
2796 * Merge the inherited ACE onto the non-inherited ACE.
2797 */
2798
2799 nt_ace_list[i].flags = SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT|
2800 (i_inh ? SEC_ACE_FLAG_INHERITED_ACE : 0);
2801 if (num_aces - j - 1 > 0)
2802 memmove(&nt_ace_list[j], &nt_ace_list[j+1], (num_aces-j-1) *
2803 sizeof(SEC_ACE));
2804
2805 DEBUG(10,("merge_default_aces: Merging ACE %u onto ACE %u.\n",
2806 (unsigned int)j, (unsigned int)i ));
2807 }
2808 num_aces--;
2809 break;
2810 }
2811 }
2812 }
2813
2814 return num_aces;
2815 }
2816
2817 /****************************************************************************
2818 Reply to query a security descriptor from an fsp. If it succeeds it allocates
2819 the space for the return elements and returns the size needed to return the
2820 security descriptor. This should be the only external function needed for
2821 the UNIX style get ACL.
2822 ****************************************************************************/
2823
2824 static NTSTATUS posix_get_nt_acl_common(struct connection_struct *conn,
2825 const char *name,
2826 const SMB_STRUCT_STAT *sbuf,
2827 struct pai_val *pal,
2828 SMB_ACL_T posix_acl,
2829 SMB_ACL_T def_acl,
2830 uint32_t security_info,
2831 SEC_DESC **ppdesc)
2832 {
2833 DOM_SID owner_sid;
2834 DOM_SID group_sid;
2835 size_t sd_size = 0;
2836 SEC_ACL *psa = NULL;
2837 size_t num_acls = 0;
2838 size_t num_def_acls = 0;
2839 size_t num_aces = 0;
2840 canon_ace *file_ace = NULL;
2841 canon_ace *dir_ace = NULL;
2842 SEC_ACE *nt_ace_list = NULL;
2843 size_t num_profile_acls = 0;
2844 SEC_DESC *psd = NULL;
2845
2846 /*
2847 * Get the owner, group and world SIDs.
2848 */
2849
2850 if (lp_profile_acls(SNUM(conn))) {
2851 /* For WXP SP1 the owner must be administrators. */
2852 sid_copy(&owner_sid, &global_sid_Builtin_Administrators);
2853 sid_copy(&group_sid, &global_sid_Builtin_Users);
2854 num_profile_acls = 2;
2855 } else {
2856 create_file_sids(sbuf, &owner_sid, &group_sid);
2857 }
2858
2859 if ((security_info & DACL_SECURITY_INFORMATION) && !(security_info & PROTECTED_DACL_SECURITY_INFORMATION)) {
2860
2861 /*
2862 * In the optimum case Creator Owner and Creator Group would be used for
2863 * the ACL_USER_OBJ and ACL_GROUP_OBJ entries, respectively, but this
2864 * would lead to usability problems under Windows: The Creator entries
2865 * are only available in browse lists of directories and not for files;
2866 * additionally the identity of the owning group couldn't be determined.
2867 * We therefore use those identities only for Default ACLs.
2868 */
2869
2870 /* Create the canon_ace lists. */
2871 file_ace = canonicalise_acl(conn, name, posix_acl, sbuf,
2872 &owner_sid, &group_sid, pal,
2873 SMB_ACL_TYPE_ACCESS);
2874
2875 /* We must have *some* ACLS. */
2876
2877 if (count_canon_ace_list(file_ace) == 0) {
2878 DEBUG(0,("get_nt_acl : No ACLs on file (%s) !\n", name));
2879 goto done;
2880 }
2881
2882 if (S_ISDIR(sbuf->st_mode) && def_acl) {
2883 dir_ace = canonicalise_acl(conn, name, def_acl,
2884 sbuf,
2885 &global_sid_Creator_Owner,
2886 &global_sid_Creator_Group,
2887 pal, SMB_ACL_TYPE_DEFAULT);
2888 }
2889
2890 /*
2891 * Create the NT ACE list from the canonical ace lists.
2892 */
2893
2894 {
2895 canon_ace *ace;
2896 enum security_ace_type nt_acl_type;
2897
2898 if (nt4_compatible_acls() && dir_ace) {
2899 /*
2900 * NT 4 chokes if an ACL contains an INHERIT_ONLY entry
2901 * but no non-INHERIT_ONLY entry for one SID. So we only
2902 * remove entries from the Access ACL if the
2903 * corresponding Default ACL entries have also been
2904 * removed. ACEs for CREATOR-OWNER and CREATOR-GROUP
2905 * are exceptions. We can do nothing
2906 * intelligent if the Default ACL contains entries that
2907 * are not also contained in the Access ACL, so this
2908 * case will still fail under NT 4.
2909 */
2910
2911 ace = canon_ace_entry_for(dir_ace, SMB_ACL_OTHER, NULL);
2912 if (ace && !ace->perms) {
2913 DLIST_REMOVE(dir_ace, ace);
2914 SAFE_FREE(ace);
2915
2916 ace = canon_ace_entry_for(file_ace, SMB_ACL_OTHER, NULL);
2917 if (ace && !ace->perms) {
2918 DLIST_REMOVE(file_ace, ace);
2919 SAFE_FREE(ace);
2920 }
2921 }
2922
2923 /*
2924 * WinNT doesn't usually have Creator Group
2925 * in browse lists, so we send this entry to
2926 * WinNT even if it contains no relevant
2927 * permissions. Once we can add
2928 * Creator Group to browse lists we can
2929 * re-enable this.
2930 */
2931
2932 #if 0
2933 ace = canon_ace_entry_for(dir_ace, SMB_ACL_GROUP_OBJ, NULL);
2934 if (ace && !ace->perms) {
2935 DLIST_REMOVE(dir_ace, ace);
2936 SAFE_FREE(ace);
2937 }
2938 #endif
2939
2940 ace = canon_ace_entry_for(file_ace, SMB_ACL_GROUP_OBJ, NULL);
2941 if (ace && !ace->perms) {
2942 DLIST_REMOVE(file_ace, ace);
2943 SAFE_FREE(ace);
2944 }
2945 }
2946
2947 num_acls = count_canon_ace_list(file_ace);
2948 num_def_acls = count_canon_ace_list(dir_ace);
2949
2950 /* Allocate the ace list. */
2951 if ((nt_ace_list = SMB_MALLOC_ARRAY(SEC_ACE,num_acls + num_profile_acls + num_def_acls)) == NULL) {
2952 DEBUG(0,("get_nt_acl: Unable to malloc space for nt_ace_list.\n"));
2953 goto done;
2954 }
2955
2956 memset(nt_ace_list, '\0', (num_acls + num_def_acls) * sizeof(SEC_ACE) );
2957
2958 /*
2959 * Create the NT ACE list from the canonical ace lists.
2960 */
2961
2962 for (ace = file_ace; ace != NULL; ace = ace->next) {
2963 uint32_t acc = map_canon_ace_perms(SNUM(conn),
2964 &nt_acl_type,
2965 ace->perms,
2966 S_ISDIR(sbuf->st_mode));
2967 init_sec_ace(&nt_ace_list[num_aces++],
2968 &ace->trustee,
2969 nt_acl_type,
2970 acc,
2971 ace->inherited ?
2972 SEC_ACE_FLAG_INHERITED_ACE : 0);
2973 }
2974
2975 /* The User must have access to a profile share - even
2976 * if we can't map the SID. */
2977 if (lp_profile_acls(SNUM(conn))) {
2978 init_sec_ace(&nt_ace_list[num_aces++],
2979 &global_sid_Builtin_Users,
2980 SEC_ACE_TYPE_ACCESS_ALLOWED,
2981 FILE_GENERIC_ALL, 0);
2982 }
2983
2984 for (ace = dir_ace; ace != NULL; ace = ace->next) {
2985 uint32_t acc = map_canon_ace_perms(SNUM(conn),
2986 &nt_acl_type,
2987 ace->perms,
2988 S_ISDIR(sbuf->st_mode));
2989 init_sec_ace(&nt_ace_list[num_aces++],
2990 &ace->trustee,
2991 nt_acl_type,
2992 acc,
2993 SEC_ACE_FLAG_OBJECT_INHERIT|
2994 SEC_ACE_FLAG_CONTAINER_INHERIT|
2995 SEC_ACE_FLAG_INHERIT_ONLY|
2996 (ace->inherited ?
2997 SEC_ACE_FLAG_INHERITED_ACE : 0));
2998 }
2999
3000 /* The User must have access to a profile share - even
3001 * if we can't map the SID. */
3002 if (lp_profile_acls(SNUM(conn))) {
3003 init_sec_ace(&nt_ace_list[num_aces++], &global_sid_Builtin_Users, SEC_ACE_TYPE_ACCESS_ALLOWED, FILE_GENERIC_ALL,
3004 SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT|
3005 SEC_ACE_FLAG_INHERIT_ONLY|0);
3006 }
3007
3008 /*
3009 * Merge POSIX default ACLs and normal ACLs into one NT ACE.
3010 * Win2K needs this to get the inheritance correct when replacing ACLs
3011 * on a directory tree. Based on work by Jim @ IBM.
3012 */
3013
3014 num_aces = merge_default_aces(nt_ace_list, num_aces);
3015
3016 }
3017
3018 if (num_aces) {
3019 if((psa = make_sec_acl( talloc_tos(), NT4_ACL_REVISION, num_aces, nt_ace_list)) == NULL) {
3020 DEBUG(0,("get_nt_acl: Unable to malloc space for acl.\n"));
3021 goto done;
3022 }
3023 }
3024 } /* security_info & DACL_SECURITY_INFORMATION */
3025
3026 psd = make_standard_sec_desc( talloc_tos(),
3027 (security_info & OWNER_SECURITY_INFORMATION) ? &owner_sid : NULL,
3028 (security_info & GROUP_SECURITY_INFORMATION) ? &group_sid : NULL,
3029 psa,
3030 &sd_size);
3031
3032 if(!psd) {
3033 DEBUG(0,("get_nt_acl: Unable to malloc space for security descriptor.\n"));
3034 sd_size = 0;
3035 goto done;
3036 }
3037
3038 /*
3039 * Windows 2000: The DACL_PROTECTED flag in the security
3040 * descriptor marks the ACL as non-inheriting, i.e., no
3041 * ACEs from higher level directories propagate to this
3042 * ACL. In the POSIX ACL model permissions are only
3043 * inherited at file create time, so ACLs never contain
3044 * any ACEs that are inherited dynamically. The DACL_PROTECTED
3045 * flag doesn't seem to bother Windows NT.
3046 * Always set this if map acl inherit is turned off.
3047 */
3048 if (get_protected_flag(pal) || !lp_map_acl_inherit(SNUM(conn))) {
3049 psd->type |= SE_DESC_DACL_PROTECTED;
3050 }
3051
3052 if (psd->dacl) {
3053 dacl_sort_into_canonical_order(psd->dacl->aces, (unsigned int)psd->dacl->num_aces);
3054 }
3055
3056 *ppdesc = psd;
3057
3058 done:
3059
3060 if (posix_acl) {
3061 SMB_VFS_SYS_ACL_FREE_ACL(conn, posix_acl);
3062 }
3063 if (def_acl) {
3064 SMB_VFS_SYS_ACL_FREE_ACL(conn, def_acl);
3065 }
3066 free_canon_ace_list(file_ace);
3067 free_canon_ace_list(dir_ace);
3068 free_inherited_info(pal);
3069 SAFE_FREE(nt_ace_list);
3070
3071 return NT_STATUS_OK;
3072 }
3073
3074 NTSTATUS posix_fget_nt_acl(struct files_struct *fsp, uint32_t security_info,
3075 SEC_DESC **ppdesc)
3076 {
3077 SMB_STRUCT_STAT sbuf;
3078 SMB_ACL_T posix_acl = NULL;
3079 struct pai_val *pal;
3080
3081 *ppdesc = NULL;
3082
3083 DEBUG(10,("posix_fget_nt_acl: called for file %s\n", fsp->fsp_name ));
3084
3085 /* can it happen that fsp_name == NULL ? */
3086 if (fsp->is_directory || fsp->fh->fd == -1) {
3087 return posix_get_nt_acl(fsp->conn, fsp->fsp_name,
3088 security_info, ppdesc);
3089 }
3090
3091 /* Get the stat struct for the owner info. */
3092 if(SMB_VFS_FSTAT(fsp, &sbuf) != 0) {
3093 return map_nt_error_from_unix(errno);
3094 }
3095
3096 /* Get the ACL from the fd. */
3097 posix_acl = SMB_VFS_SYS_ACL_GET_FD(fsp);
3098
3099 pal = fload_inherited_info(fsp);
3100
3101 return posix_get_nt_acl_common(fsp->conn, fsp->fsp_name, &sbuf, pal,
3102 posix_acl, NULL, security_info, ppdesc);
3103 }
3104
3105 NTSTATUS posix_get_nt_acl(struct connection_struct *conn, const char *name,
3106 uint32_t security_info, SEC_DESC **ppdesc)
3107 {
3108 SMB_STRUCT_STAT sbuf;
3109 SMB_ACL_T posix_acl = NULL;
3110 SMB_ACL_T def_acl = NULL;
3111 struct pai_val *pal;
3112
3113 *ppdesc = NULL;
3114
3115 DEBUG(10,("posix_get_nt_acl: called for file %s\n", name ));
3116
3117 /* Get the stat struct for the owner info. */
3118 if(SMB_VFS_STAT(conn, name, &sbuf) != 0) {
3119 return map_nt_error_from_unix(errno);
3120 }
3121
3122 /* Get the ACL from the path. */
3123 posix_acl = SMB_VFS_SYS_ACL_GET_FILE(conn, name, SMB_ACL_TYPE_ACCESS);
3124
3125 /* If it's a directory get the default POSIX ACL. */
3126 if(S_ISDIR(sbuf.st_mode)) {
3127 def_acl = SMB_VFS_SYS_ACL_GET_FILE(conn, name, SMB_ACL_TYPE_DEFAULT);
3128 def_acl = free_empty_sys_acl(conn, def_acl);
3129 }
3130
3131 pal = load_inherited_info(conn, name);
3132
3133 return posix_get_nt_acl_common(conn, name, &sbuf, pal, posix_acl,
3134 def_acl, security_info, ppdesc);
3135 }
3136
3137 /****************************************************************************
3138 Try to chown a file. We will be able to chown it under the following conditions.
3139
3140 1) If we have root privileges, then it will just work.
3141 2) If we have SeTakeOwnershipPrivilege we can change the user to the current user.
3142 3) If we have SeRestorePrivilege we can change the user to any other user.
3143 4) If we have write permission to the file and dos_filemodes is set
3144 then allow chown to the currently authenticated user.
3145 ****************************************************************************/
3146
3147 int try_chown(connection_struct *conn, const char *fname, uid_t uid, gid_t gid)
3148 {
3149 int ret;
3150 files_struct *fsp;
3151 SMB_STRUCT_STAT st;
3152
3153 if(!CAN_WRITE(conn)) {
3154 return -1;
3155 }
3156
3157 /* Case (1). */
3158 /* try the direct way first */
3159 ret = SMB_VFS_CHOWN(conn, fname, uid, gid);
3160 if (ret == 0)
3161 return 0;
3162
3163 /* Case (2) / (3) */
3164 if (lp_enable_privileges()) {
3165
3166 bool has_take_ownership_priv = user_has_privileges(current_user.nt_user_token,
3167 &se_take_ownership);
3168 bool has_restore_priv = user_has_privileges(current_user.nt_user_token,
3169 &se_restore);
3170
3171 /* Case (2) */
3172 if ( ( has_take_ownership_priv && ( uid == current_user.ut.uid ) ) ||
3173 /* Case (3) */
3174 ( has_restore_priv ) ) {
3175
3176 become_root();
3177 /* Keep the current file gid the same - take ownership doesn't imply group change. */
3178 ret = SMB_VFS_CHOWN(conn, fname, uid, (gid_t)-1);
3179 unbecome_root();
3180 return ret;
3181 }
3182 }
3183
3184 /* Case (4). */
3185 if (!lp_dos_filemode(SNUM(conn))) {
3186 errno = EPERM;
3187 return -1;
3188 }
3189
3190 /* only allow chown to the current user. This is more secure,
3191 and also copes with the case where the SID in a take ownership ACL is
3192 a local SID on the users workstation
3193 */
3194 if (uid != current_user.ut.uid) {
3195 errno = EPERM;
3196 return -1;
3197 }
3198
3199 if (SMB_VFS_STAT(conn,fname,&st)) {
3200 return -1;
3201 }
3202
3203 if (!NT_STATUS_IS_OK(open_file_fchmod(NULL, conn, fname, &st, &fsp))) {
3204 return -1;
3205 }
3206
3207 become_root();
3208 /* Keep the current file gid the same. */
3209 ret = SMB_VFS_FCHOWN(fsp, uid, (gid_t)-1);
3210 unbecome_root();
3211
3212 close_file_fchmod(NULL, fsp);
3213
3214 return ret;
3215 }
3216
3217 #if 0
3218 /* Disable this - prevents ACL inheritance from the ACL editor. JRA. */
3219
3220 /****************************************************************************
3221 Take care of parent ACL inheritance.
3222 ****************************************************************************/
3223
3224 NTSTATUS append_parent_acl(files_struct *fsp,
3225 const SEC_DESC *pcsd,
3226 SEC_DESC **pp_new_sd)
3227 {
3228 SEC_DESC *parent_sd = NULL;
3229 files_struct *parent_fsp = NULL;
3230 TALLOC_CTX *mem_ctx = talloc_tos();
3231 char *parent_name = NULL;
3232 SEC_ACE *new_ace = NULL;
3233 unsigned int num_aces = pcsd->dacl->num_aces;
3234 SMB_STRUCT_STAT sbuf;
3235 NTSTATUS status;
3236 int info;
3237 unsigned int i, j;
3238 SEC_DESC *psd = dup_sec_desc(talloc_tos(), pcsd);
3239 bool is_dacl_protected = (pcsd->type & SE_DESC_DACL_PROTECTED);
3240
3241 ZERO_STRUCT(sbuf);
3242
3243 if (psd == NULL) {
3244 return NT_STATUS_NO_MEMORY;
3245 }
3246
3247 if (!parent_dirname(mem_ctx, fsp->fsp_name, &parent_name, NULL)) {
3248 return NT_STATUS_NO_MEMORY;
3249 }
3250
3251 status = SMB_VFS_CREATE_FILE(
3252 fsp->conn, /* conn */
3253 NULL, /* req */
3254 0, /* root_dir_fid */
3255 parent_name, /* fname */
3256 0, /* create_file_flags */
3257 FILE_READ_ATTRIBUTES, /* access_mask */
3258 FILE_SHARE_NONE, /* share_access */
3259 FILE_OPEN, /* create_disposition*/
3260 FILE_DIRECTORY_FILE, /* create_options */
3261 0, /* file_attributes */
3262 INTERNAL_OPEN_ONLY, /* oplock_request */
3263 0, /* allocation_size */
3264 NULL, /* sd */
3265 NULL, /* ea_list */
3266 &parent_fsp, /* result */
3267 &info, /* pinfo */
3268 &sbuf); /* psbuf */
3269
3270 if (!NT_STATUS_IS_OK(status)) {
3271 return status;
3272 }
3273
3274 status = SMB_VFS_GET_NT_ACL(parent_fsp->conn, parent_fsp->fsp_name,
3275 DACL_SECURITY_INFORMATION, &parent_sd );
3276
3277 close_file(NULL, parent_fsp, NORMAL_CLOSE);
3278
3279 if (!NT_STATUS_IS_OK(status)) {
3280 return status;
3281 }
3282
3283 /*
3284 * Make room for potentially all the ACLs from
3285 * the parent. We used to add the ugw triple here,
3286 * as we knew we were dealing with POSIX ACLs.
3287 * We no longer need to do so as we can guarentee
3288 * that a default ACL from the parent directory will
3289 * be well formed for POSIX ACLs if it came from a
3290 * POSIX ACL source, and if we're not writing to a
3291 * POSIX ACL sink then we don't care if it's not well
3292 * formed. JRA.
3293 */
3294
3295 num_aces += parent_sd->dacl->num_aces;
3296
3297 if((new_ace = TALLOC_ZERO_ARRAY(mem_ctx, SEC_ACE,
3298 num_aces)) == NULL) {
3299 return NT_STATUS_NO_MEMORY;
3300 }
3301
3302 /* Start by copying in all the given ACE entries. */
3303 for (i = 0; i < psd->dacl->num_aces; i++) {
3304 sec_ace_copy(&new_ace[i], &psd->dacl->aces[i]);
3305 }
3306
3307 /*
3308 * Note that we're ignoring "inherit permissions" here
3309 * as that really only applies to newly created files. JRA.
3310 */
3311
3312 /* Finally append any inherited ACEs. */
3313 for (j = 0; j < parent_sd->dacl->num_aces; j++) {
3314 SEC_ACE *se = &parent_sd->dacl->aces[j];
3315
3316 if (fsp->is_directory) {
3317 if (!(se->flags & SEC_ACE_FLAG_CONTAINER_INHERIT)) {
3318 /* Doesn't apply to a directory - ignore. */
3319 DEBUG(10,("append_parent_acl: directory %s "
3320 "ignoring non container "
3321 "inherit flags %u on ACE with sid %s "
3322 "from parent %s\n",
3323 fsp->fsp_name,
3324 (unsigned int)se->flags,
3325 sid_string_dbg(&se->trustee),
3326 parent_name));
3327 continue;
3328 }
3329 } else {
3330 if (!(se->flags & SEC_ACE_FLAG_OBJECT_INHERIT)) {
3331 /* Doesn't apply to a file - ignore. */
3332 DEBUG(10,("append_parent_acl: file %s "
3333 "ignoring non object "
3334 "inherit flags %u on ACE with sid %s "
3335 "from parent %s\n",
3336 fsp->fsp_name,
3337 (unsigned int)se->flags,
3338 sid_string_dbg(&se->trustee),
3339 parent_name));
3340 continue;
3341 }
3342 }
3343
3344 if (is_dacl_protected) {
3345 /* If the DACL is protected it means we must
3346 * not overwrite an existing ACE entry with the
3347 * same SID. This is order N^2. Ouch :-(. JRA. */
3348 unsigned int k;
3349 for (k = 0; k < psd->dacl->num_aces; k++) {
3350 if (sid_equal(&psd->dacl->aces[k].trustee,
3351 &se->trustee)) {
3352 break;
3353 }
3354 }
3355 if (k < psd->dacl->num_aces) {
3356 /* SID matched. Ignore. */
3357 DEBUG(10,("append_parent_acl: path %s "
3358 "ignoring ACE with protected sid %s "
3359 "from parent %s\n",
3360 fsp->fsp_name,
3361 sid_string_dbg(&se->trustee),
3362 parent_name));
3363 continue;
3364 }
3365 }
3366
3367 sec_ace_copy(&new_ace[i], se);
3368 if (se->flags & SEC_ACE_FLAG_NO_PROPAGATE_INHERIT) {
3369 new_ace[i].flags &= ~(SEC_ACE_FLAG_VALID_INHERIT);
3370 }
3371 new_ace[i].flags |= SEC_ACE_FLAG_INHERITED_ACE;
3372
3373 if (fsp->is_directory) {
3374 /*
3375 * Strip off any inherit only. It's applied.
3376 */
3377 new_ace[i].flags &= ~(SEC_ACE_FLAG_INHERIT_ONLY);
3378 if (se->flags & SEC_ACE_FLAG_NO_PROPAGATE_INHERIT) {
3379 /* No further inheritance. */
3380 new_ace[i].flags &=
3381 ~(SEC_ACE_FLAG_CONTAINER_INHERIT|
3382 SEC_ACE_FLAG_OBJECT_INHERIT);
3383 }
3384 } else {
3385 /*
3386 * Strip off any container or inherit
3387 * flags, they can't apply to objects.
3388 */
3389 new_ace[i].flags &= ~(SEC_ACE_FLAG_CONTAINER_INHERIT|
3390 SEC_ACE_FLAG_INHERIT_ONLY|
3391 SEC_ACE_FLAG_NO_PROPAGATE_INHERIT);
3392 }
3393 i++;
3394
3395 DEBUG(10,("append_parent_acl: path %s "
3396 "inheriting ACE with sid %s "
3397 "from parent %s\n",
3398 fsp->fsp_name,
3399 sid_string_dbg(&se->trustee),
3400 parent_name));
3401 }
3402
3403 psd->dacl->aces = new_ace;
3404 psd->dacl->num_aces = i;
3405 psd->type &= ~(SE_DESC_DACL_AUTO_INHERITED|
3406 SE_DESC_DACL_AUTO_INHERIT_REQ);
3407
3408 *pp_new_sd = psd;
3409 return status;
3410 }
3411 #endif
3412
3413 /****************************************************************************
3414 Reply to set a security descriptor on an fsp. security_info_sent is the
3415 description of the following NT ACL.
3416 This should be the only external function needed for the UNIX style set ACL.
3417 ****************************************************************************/
3418
3419 NTSTATUS set_nt_acl(files_struct *fsp, uint32 security_info_sent, const SEC_DESC *psd)
3420 {
3421 connection_struct *conn = fsp->conn;
3422 uid_t user = (uid_t)-1;
3423 gid_t grp = (gid_t)-1;
3424 SMB_STRUCT_STAT sbuf;
3425 DOM_SID file_owner_sid;
3426 DOM_SID file_grp_sid;
3427 canon_ace *file_ace_list = NULL;
3428 canon_ace *dir_ace_list = NULL;
3429 bool acl_perms = False;
3430 mode_t orig_mode = (mode_t)0;
3431 NTSTATUS status;
3432 bool set_acl_as_root = false;
3433 bool acl_set_support = false;
3434 bool ret = false;
3435
3436 DEBUG(10,("set_nt_acl: called for file %s\n", fsp->fsp_name ));
3437
3438 if (!CAN_WRITE(conn)) {
3439 DEBUG(10,("set acl rejected on read-only share\n"));
3440 return NT_STATUS_MEDIA_WRITE_PROTECTED;
3441 }
3442
3443 /*
3444 * Get the current state of the file.
3445 */
3446
3447 if(fsp->is_directory || fsp->fh->fd == -1) {
3448 if(SMB_VFS_STAT(fsp->conn,fsp->fsp_name, &sbuf) != 0)
3449 return map_nt_error_from_unix(errno);
3450 } else {
3451 if(SMB_VFS_FSTAT(fsp, &sbuf) != 0)
3452 return map_nt_error_from_unix(errno);
3453 }
3454
3455 /* Save the original element we check against. */
3456 orig_mode = sbuf.st_mode;
3457
3458 /*
3459 * Unpack the user/group/world id's.
3460 */
3461
3462 status = unpack_nt_owners( SNUM(conn), &user, &grp, security_info_sent, psd);
3463 if (!NT_STATUS_IS_OK(status)) {
3464 return status;
3465 }
3466
3467 /*
3468 * Do we need to chown ? If so this must be done first as the incoming
3469 * CREATOR_OWNER acl will be relative to the *new* owner, not the old.
3470 * Noticed by Simo.
3471 */
3472
3473 if (((user != (uid_t)-1) && (sbuf.st_uid != user)) || (( grp != (gid_t)-1) && (sbuf.st_gid != grp))) {
3474
3475 DEBUG(3,("set_nt_acl: chown %s. uid = %u, gid = %u.\n",
3476 fsp->fsp_name, (unsigned int)user, (unsigned int)grp ));
3477
3478 if(try_chown( fsp->conn, fsp->fsp_name, user, grp) == -1) {
3479 DEBUG(3,("set_nt_acl: chown %s, %u, %u failed. Error = %s.\n",
3480 fsp->fsp_name, (unsigned int)user, (unsigned int)grp, strerror(errno) ));
3481 if (errno == EPERM) {
3482 return NT_STATUS_INVALID_OWNER;
3483 }
3484 return map_nt_error_from_unix(errno);
3485 }
3486
3487 /*
3488 * Recheck the current state of the file, which may have changed.
3489 * (suid/sgid bits, for instance)
3490 */
3491
3492 if(fsp->is_directory) {
3493 if(SMB_VFS_STAT(fsp->conn, fsp->fsp_name, &sbuf) != 0) {
3494 return map_nt_error_from_unix(errno);
3495 }
3496 } else {
3497
3498 int sret;
3499
3500 if(fsp->fh->fd == -1)
3501 sret = SMB_VFS_STAT(fsp->conn, fsp->fsp_name, &sbuf);
3502 else
3503 sret = SMB_VFS_FSTAT(fsp, &sbuf);
3504
3505 if(sret != 0)
3506 return map_nt_error_from_unix(errno);
3507 }
3508
3509 /* Save the original element we check against. */
3510 orig_mode = sbuf.st_mode;
3511
3512 /* If we successfully chowned, we know we must
3513 * be able to set the acl, so do it as root.
3514 */
3515 set_acl_as_root = true;
3516 }
3517
3518 create_file_sids(&sbuf, &file_owner_sid, &file_grp_sid);
3519
3520 acl_perms = unpack_canon_ace( fsp, &sbuf, &file_owner_sid, &file_grp_sid,
3521 &file_ace_list, &dir_ace_list, security_info_sent, psd);
3522
3523 /* Ignore W2K traverse DACL set. */
3524 if (!file_ace_list && !dir_ace_list) {
3525 return NT_STATUS_OK;
3526 }
3527
3528 if (!acl_perms) {
3529 DEBUG(3,("set_nt_acl: cannot set permissions\n"));
3530 free_canon_ace_list(file_ace_list);
3531 free_canon_ace_list(dir_ace_list);
3532 return NT_STATUS_ACCESS_DENIED;
3533 }
3534
3535 /*
3536 * Only change security if we got a DACL.
3537 */
3538
3539 if(!(security_info_sent & DACL_SECURITY_INFORMATION) || (psd->dacl == NULL)) {
3540 free_canon_ace_list(file_ace_list);
3541 free_canon_ace_list(dir_ace_list);
3542 return NT_STATUS_OK;
3543 }
3544
3545 /*
3546 * Try using the POSIX ACL set first. Fall back to chmod if
3547 * we have no ACL support on this filesystem.
3548 */
3549
3550 if (acl_perms && file_ace_list) {
3551 if (set_acl_as_root) {
3552 become_root();
3553 }
3554 ret = set_canon_ace_list(fsp, file_ace_list, False, sbuf.st_gid, &acl_set_support);
3555 if (set_acl_as_root) {
3556 unbecome_root();
3557 }
3558 if (acl_set_support && ret == false) {
3559 DEBUG(3,("set_nt_acl: failed to set file acl on file %s (%s).\n", fsp->fsp_name, strerror(errno) ));
3560 free_canon_ace_list(file_ace_list);
3561 free_canon_ace_list(dir_ace_list);
3562 return map_nt_error_from_unix(errno);
3563 }
3564 }
3565
3566 if (acl_perms && acl_set_support && fsp->is_directory) {
3567 if (dir_ace_list) {
3568 if (set_acl_as_root) {
3569 become_root();
3570 }
3571 ret = set_canon_ace_list(fsp, dir_ace_list, True, sbuf.st_gid, &acl_set_support);
3572 if (set_acl_as_root) {
3573 unbecome_root();
3574 }
3575 if (ret == false) {
3576 DEBUG(3,("set_nt_acl: failed to set default acl on directory %s (%s).\n", fsp->fsp_name, strerror(errno) ));
3577 free_canon_ace_list(file_ace_list);
3578 free_canon_ace_list(dir_ace_list);
3579 return map_nt_error_from_unix(errno);
3580 }
3581 } else {
3582 int sret = -1;
3583
3584 /*
3585 * No default ACL - delete one if it exists.
3586 */
3587
3588 if (set_acl_as_root) {
3589 become_root();
3590 }
3591 sret = SMB_VFS_SYS_ACL_DELETE_DEF_FILE(conn, fsp->fsp_name);
3592 if (set_acl_as_root) {
3593 unbecome_root();
3594 }
3595 if (sret == -1) {
3596 if (acl_group_override(conn, sbuf.st_gid, fsp->fsp_name)) {
3597 DEBUG(5,("set_nt_acl: acl group control on and "
3598 "current user in file %s primary group. Override delete_def_acl\n",
3599 fsp->fsp_name ));
3600
3601 become_root();
3602 sret = SMB_VFS_SYS_ACL_DELETE_DEF_FILE(conn, fsp->fsp_name);
3603 unbecome_root();
3604 }
3605
3606 if (sret == -1) {
3607 DEBUG(3,("set_nt_acl: sys_acl_delete_def_file failed (%s)\n", strerror(errno)));
3608 free_canon_ace_list(file_ace_list);
3609 free_canon_ace_list(dir_ace_list);
3610 return map_nt_error_from_unix(errno);
3611 }
3612 }
3613 }
3614 }
3615
3616 if (acl_set_support) {
3617 if (set_acl_as_root) {
3618 become_root();
3619 }
3620 store_inheritance_attributes(fsp, file_ace_list, dir_ace_list,
3621 (psd->type & SE_DESC_DACL_PROTECTED) ? True : False);
3622 if (set_acl_as_root) {
3623 unbecome_root();
3624 }
3625 }
3626
3627 /*
3628 * If we cannot set using POSIX ACLs we fall back to checking if we need to chmod.
3629 */
3630
3631 if(!acl_set_support && acl_perms) {
3632 mode_t posix_perms;
3633
3634 if (!convert_canon_ace_to_posix_perms( fsp, file_ace_list, &posix_perms)) {
3635 free_canon_ace_list(file_ace_list);
3636 free_canon_ace_list(dir_ace_list);
3637 DEBUG(3,("set_nt_acl: failed to convert file acl to posix permissions for file %s.\n",
3638 fsp->fsp_name ));
3639 return NT_STATUS_ACCESS_DENIED;
3640 }
3641
3642 if (orig_mode != posix_perms) {
3643 int sret = -1;
3644
3645 DEBUG(3,("set_nt_acl: chmod %s. perms = 0%o.\n",
3646 fsp->fsp_name, (unsigned int)posix_perms ));
3647
3648 if (set_acl_as_root) {
3649 become_root();
3650 }
3651 sret = SMB_VFS_CHMOD(conn,fsp->fsp_name, posix_perms);
3652 if (set_acl_as_root) {
3653 unbecome_root();
3654 }
3655 if(sret == -1) {
3656 if (acl_group_override(conn, sbuf.st_gid, fsp->fsp_name)) {
3657 DEBUG(5,("set_nt_acl: acl group control on and "
3658 "current user in file %s primary group. Override chmod\n",
3659 fsp->fsp_name ));
3660
3661 become_root();
3662 sret = SMB_VFS_CHMOD(conn,fsp->fsp_name, posix_perms);
3663 unbecome_root();
3664 }
3665
3666 if (sret == -1) {
3667 DEBUG(3,("set_nt_acl: chmod %s, 0%o failed. Error = %s.\n",
3668 fsp->fsp_name, (unsigned int)posix_perms, strerror(errno) ));
3669 free_canon_ace_list(file_ace_list);
3670 free_canon_ace_list(dir_ace_list);
3671 return map_nt_error_from_unix(errno);
3672 }
3673 }
3674 }
3675 }
3676
3677 free_canon_ace_list(file_ace_list);
3678 free_canon_ace_list(dir_ace_list);
3679
3680 return NT_STATUS_OK;
3681 }
3682
3683 /****************************************************************************
3684 Get the actual group bits stored on a file with an ACL. Has no effect if
3685 the file has no ACL. Needed in dosmode code where the stat() will return
3686 the mask bits, not the real group bits, for a file with an ACL.
3687 ****************************************************************************/
3688
3689 int get_acl_group_bits( connection_struct *conn, const char *fname, mode_t *mode )
3690 {
3691 int entry_id = SMB_ACL_FIRST_ENTRY;
3692 SMB_ACL_ENTRY_T entry;
3693 SMB_ACL_T posix_acl;
3694 int result = -1;
3695
3696 posix_acl = SMB_VFS_SYS_ACL_GET_FILE(conn, fname, SMB_ACL_TYPE_ACCESS);
3697 if (posix_acl == (SMB_ACL_T)NULL)
3698 return -1;
3699
3700 while (SMB_VFS_SYS_ACL_GET_ENTRY(conn, posix_acl, entry_id, &entry) == 1) {
3701 SMB_ACL_TAG_T tagtype;
3702 SMB_ACL_PERMSET_T permset;
3703
3704 entry_id = SMB_ACL_NEXT_ENTRY;
3705
3706 if (SMB_VFS_SYS_ACL_GET_TAG_TYPE(conn, entry, &tagtype) ==-1)
3707 break;
3708
3709 if (tagtype == SMB_ACL_GROUP_OBJ) {
3710 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, entry, &permset) == -1) {
3711 break;
3712 } else {
3713 *mode &= ~(S_IRGRP|S_IWGRP|S_IXGRP);
3714 *mode |= (SMB_VFS_SYS_ACL_GET_PERM(conn, permset, SMB_ACL_READ) ? S_IRGRP : 0);
3715 *mode |= (SMB_VFS_SYS_ACL_GET_PERM(conn, permset, SMB_ACL_WRITE) ? S_IWGRP : 0);
3716 *mode |= (SMB_VFS_SYS_ACL_GET_PERM(conn, permset, SMB_ACL_EXECUTE) ? S_IXGRP : 0);
3717 result = 0;
3718 break;
3719 }
3720 }
3721 }
3722 SMB_VFS_SYS_ACL_FREE_ACL(conn, posix_acl);
3723 return result;
3724 }
3725
3726 /****************************************************************************
3727 Do a chmod by setting the ACL USER_OBJ, GROUP_OBJ and OTHER bits in an ACL
3728 and set the mask to rwx. Needed to preserve complex ACLs set by NT.
3729 ****************************************************************************/
3730
3731 static int chmod_acl_internals( connection_struct *conn, SMB_ACL_T posix_acl, mode_t mode)
3732 {
3733 int entry_id = SMB_ACL_FIRST_ENTRY;
3734 SMB_ACL_ENTRY_T entry;
3735 int num_entries = 0;
3736
3737 while ( SMB_VFS_SYS_ACL_GET_ENTRY(conn, posix_acl, entry_id, &entry) == 1) {
3738 SMB_ACL_TAG_T tagtype;
3739 SMB_ACL_PERMSET_T permset;
3740 mode_t perms;
3741
3742 entry_id = SMB_ACL_NEXT_ENTRY;
3743
3744 if (SMB_VFS_SYS_ACL_GET_TAG_TYPE(conn, entry, &tagtype) == -1)
3745 return -1;
3746
3747 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, entry, &permset) == -1)
3748 return -1;
3749
3750 num_entries++;
3751
3752 switch(tagtype) {
3753 case SMB_ACL_USER_OBJ:
3754 perms = unix_perms_to_acl_perms(mode, S_IRUSR, S_IWUSR, S_IXUSR);
3755 break;
3756 case SMB_ACL_GROUP_OBJ:
3757 perms = unix_perms_to_acl_perms(mode, S_IRGRP, S_IWGRP, S_IXGRP);
3758 break;
3759 case SMB_ACL_MASK:
3760 /*
3761 * FIXME: The ACL_MASK entry permissions should really be set to
3762 * the union of the permissions of all ACL_USER,
3763 * ACL_GROUP_OBJ, and ACL_GROUP entries. That's what
3764 * acl_calc_mask() does, but Samba ACLs doesn't provide it.
3765 */
3766 perms = S_IRUSR|S_IWUSR|S_IXUSR;
3767 break;
3768 case SMB_ACL_OTHER:
3769 perms = unix_perms_to_acl_perms(mode, S_IROTH, S_IWOTH, S_IXOTH);
3770 break;
3771 default:
3772 continue;
3773 }
3774
3775 if (map_acl_perms_to_permset(conn, perms, &permset) == -1)
3776 return -1;
3777
3778 if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, entry, permset) == -1)
3779 return -1;
3780 }
3781
3782 /*
3783 * If this is a simple 3 element ACL or no elements then it's a standard
3784 * UNIX permission set. Just use chmod...
3785 */
3786
3787 if ((num_entries == 3) || (num_entries == 0))
3788 return -1;
3789
3790 return 0;
3791 }
3792
3793 /****************************************************************************
3794 Get the access ACL of FROM, do a chmod by setting the ACL USER_OBJ,
3795 GROUP_OBJ and OTHER bits in an ACL and set the mask to rwx. Set the
3796 resulting ACL on TO. Note that name is in UNIX character set.
3797 ****************************************************************************/
3798
3799 static int copy_access_posix_acl(connection_struct *conn, const char *from, const char *to, mode_t mode)
3800 {
3801 SMB_ACL_T posix_acl = NULL;
3802 int ret = -1;
3803
3804 if ((posix_acl = SMB_VFS_SYS_ACL_GET_FILE(conn, from, SMB_ACL_TYPE_ACCESS)) == NULL)
3805 return -1;
3806
3807 if ((ret = chmod_acl_internals(conn, posix_acl, mode)) == -1)
3808 goto done;
3809
3810 ret = SMB_VFS_SYS_ACL_SET_FILE(conn, to, SMB_ACL_TYPE_ACCESS, posix_acl);
3811
3812 done:
3813
3814 SMB_VFS_SYS_ACL_FREE_ACL(conn, posix_acl);
3815 return ret;
3816 }
3817
3818 /****************************************************************************
3819 Do a chmod by setting the ACL USER_OBJ, GROUP_OBJ and OTHER bits in an ACL
3820 and set the mask to rwx. Needed to preserve complex ACLs set by NT.
3821 Note that name is in UNIX character set.
3822 ****************************************************************************/
3823
3824 int chmod_acl(connection_struct *conn, const char *name, mode_t mode)
3825 {
3826 return copy_access_posix_acl(conn, name, name, mode);
3827 }
3828
3829 /****************************************************************************
3830 Check for an existing default POSIX ACL on a directory.
3831 ****************************************************************************/
3832
3833 static bool directory_has_default_posix_acl(connection_struct *conn, const char *fname)
3834 {
3835 SMB_ACL_T def_acl = SMB_VFS_SYS_ACL_GET_FILE( conn, fname, SMB_ACL_TYPE_DEFAULT);
3836 bool has_acl = False;
3837 SMB_ACL_ENTRY_T entry;
3838
3839 if (def_acl != NULL && (SMB_VFS_SYS_ACL_GET_ENTRY(conn, def_acl, SMB_ACL_FIRST_ENTRY, &entry) == 1)) {
3840 has_acl = True;
3841 }
3842
3843 if (def_acl) {
3844 SMB_VFS_SYS_ACL_FREE_ACL(conn, def_acl);
3845 }
3846 return has_acl;
3847 }
3848
3849 /****************************************************************************
3850 If the parent directory has no default ACL but it does have an Access ACL,
3851 inherit this Access ACL to file name.
3852 ****************************************************************************/
3853
3854 int inherit_access_posix_acl(connection_struct *conn, const char *inherit_from_dir,
3855 const char *name, mode_t mode)
3856 {
3857 if (directory_has_default_posix_acl(conn, inherit_from_dir))
3858 return 0;
3859
3860 return copy_access_posix_acl(conn, inherit_from_dir, name, mode);
3861 }
3862
3863 /****************************************************************************
3864 Do an fchmod by setting the ACL USER_OBJ, GROUP_OBJ and OTHER bits in an ACL
3865 and set the mask to rwx. Needed to preserve complex ACLs set by NT.
3866 ****************************************************************************/
3867
3868 int fchmod_acl(files_struct *fsp, mode_t mode)
3869 {
3870 connection_struct *conn = fsp->conn;
3871 SMB_ACL_T posix_acl = NULL;
3872 int ret = -1;
3873
3874 if ((posix_acl = SMB_VFS_SYS_ACL_GET_FD(fsp)) == NULL)
3875 return -1;
3876
3877 if ((ret = chmod_acl_internals(conn, posix_acl, mode)) == -1)
3878 goto done;
3879
3880 ret = SMB_VFS_SYS_ACL_SET_FD(fsp, posix_acl);
3881
3882 done:
3883
3884 SMB_VFS_SYS_ACL_FREE_ACL(conn, posix_acl);
3885 return ret;
3886 }
3887
3888 /****************************************************************************
3889 Map from wire type to permset.
3890 ****************************************************************************/
3891
3892 static bool unix_ex_wire_to_permset(connection_struct *conn, unsigned char wire_perm, SMB_ACL_PERMSET_T *p_permset)
3893 {
3894 if (wire_perm & ~(SMB_POSIX_ACL_READ|SMB_POSIX_ACL_WRITE|SMB_POSIX_ACL_EXECUTE)) {
3895 return False;
3896 }
3897
3898 if (SMB_VFS_SYS_ACL_CLEAR_PERMS(conn, *p_permset) == -1) {
3899 return False;
3900 }
3901
3902 if (wire_perm & SMB_POSIX_ACL_READ) {
3903 if (SMB_VFS_SYS_ACL_ADD_PERM(conn, *p_permset, SMB_ACL_READ) == -1) {
3904 return False;
3905 }
3906 }
3907 if (wire_perm & SMB_POSIX_ACL_WRITE) {
3908 if (SMB_VFS_SYS_ACL_ADD_PERM(conn, *p_permset, SMB_ACL_WRITE) == -1) {
3909 return False;
3910 }
3911 }
3912 if (wire_perm & SMB_POSIX_ACL_EXECUTE) {
3913 if (SMB_VFS_SYS_ACL_ADD_PERM(conn, *p_permset, SMB_ACL_EXECUTE) == -1) {
3914 return False;
3915 }
3916 }
3917 return True;
3918 }
3919
3920 /****************************************************************************
3921 Map from wire type to tagtype.
3922 ****************************************************************************/
3923
3924 static bool unix_ex_wire_to_tagtype(unsigned char wire_tt, SMB_ACL_TAG_T *p_tt)
3925 {
3926 switch (wire_tt) {
3927 case SMB_POSIX_ACL_USER_OBJ:
3928 *p_tt = SMB_ACL_USER_OBJ;
3929 break;
3930 case SMB_POSIX_ACL_USER:
3931 *p_tt = SMB_ACL_USER;
3932 break;
3933 case SMB_POSIX_ACL_GROUP_OBJ:
3934 *p_tt = SMB_ACL_GROUP_OBJ;
3935 break;
3936 case SMB_POSIX_ACL_GROUP:
3937 *p_tt = SMB_ACL_GROUP;
3938 break;
3939 case SMB_POSIX_ACL_MASK:
3940 *p_tt = SMB_ACL_MASK;
3941 break;
3942 case SMB_POSIX_ACL_OTHER:
3943 *p_tt = SMB_ACL_OTHER;
3944 break;
3945 default:
3946 return False;
3947 }
3948 return True;
3949 }
3950
3951 /****************************************************************************
3952 Create a new POSIX acl from wire permissions.
3953 FIXME ! How does the share mask/mode fit into this.... ?
3954 ****************************************************************************/
3955
3956 static SMB_ACL_T create_posix_acl_from_wire(connection_struct *conn, uint16 num_acls, const char *pdata)
3957 {
3958 unsigned int i;
3959 SMB_ACL_T the_acl = SMB_VFS_SYS_ACL_INIT(conn, num_acls);
3960
3961 if (the_acl == NULL) {
3962 return NULL;
3963 }
3964
3965 for (i = 0; i < num_acls; i++) {
3966 SMB_ACL_ENTRY_T the_entry;
3967 SMB_ACL_PERMSET_T the_permset;
3968 SMB_ACL_TAG_T tag_type;
3969
3970 if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &the_acl, &the_entry) == -1) {
3971 DEBUG(0,("create_posix_acl_from_wire: Failed to create entry %u. (%s)\n",
3972 i, strerror(errno) ));
3973 goto fail;
3974 }
3975
3976 if (!unix_ex_wire_to_tagtype(CVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)), &tag_type)) {
3977 DEBUG(0,("create_posix_acl_from_wire: invalid wire tagtype %u on entry %u.\n",
3978 CVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)), i ));
3979 goto fail;
3980 }
3981
3982 if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, the_entry, tag_type) == -1) {
3983 DEBUG(0,("create_posix_acl_from_wire: Failed to set tagtype on entry %u. (%s)\n",
3984 i, strerror(errno) ));
3985 goto fail;
3986 }
3987
3988 /* Get the permset pointer from the new ACL entry. */
3989 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, the_entry, &the_permset) == -1) {
3990 DEBUG(0,("create_posix_acl_from_wire: Failed to get permset on entry %u. (%s)\n",
3991 i, strerror(errno) ));
3992 goto fail;
3993 }
3994
3995 /* Map from wire to permissions. */
3996 if (!unix_ex_wire_to_permset(conn, CVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)+1), &the_permset)) {
3997 DEBUG(0,("create_posix_acl_from_wire: invalid permset %u on entry %u.\n",
3998 CVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE) + 1), i ));
3999 goto fail;
4000 }
4001
4002 /* Now apply to the new ACL entry. */
4003 if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, the_entry, the_permset) == -1) {
4004 DEBUG(0,("create_posix_acl_from_wire: Failed to add permset on entry %u. (%s)\n",
4005 i, strerror(errno) ));
4006 goto fail;
4007 }
4008
4009 if (tag_type == SMB_ACL_USER) {
4010 uint32 uidval = IVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)+2);
4011 uid_t uid = (uid_t)uidval;
4012 if (SMB_VFS_SYS_ACL_SET_QUALIFIER(conn, the_entry,(void *)&uid) == -1) {
4013 DEBUG(0,("create_posix_acl_from_wire: Failed to set uid %u on entry %u. (%s)\n",
4014 (unsigned int)uid, i, strerror(errno) ));
4015 goto fail;
4016 }
4017 }
4018
4019 if (tag_type == SMB_ACL_GROUP) {
4020 uint32 gidval = IVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)+2);
4021 gid_t gid = (uid_t)gidval;
4022 if (SMB_VFS_SYS_ACL_SET_QUALIFIER(conn, the_entry,(void *)&gid) == -1) {
4023 DEBUG(0,("create_posix_acl_from_wire: Failed to set gid %u on entry %u. (%s)\n",
4024 (unsigned int)gid, i, strerror(errno) ));
4025 goto fail;
4026 }
4027 }
4028 }
4029
4030 return the_acl;
4031
4032 fail:
4033
4034 if (the_acl != NULL) {
4035 SMB_VFS_SYS_ACL_FREE_ACL(conn, the_acl);
4036 }
4037 return NULL;
4038 }
4039
4040 /****************************************************************************
4041 Calls from UNIX extensions - Default POSIX ACL set.
4042 If num_def_acls == 0 and not a directory just return. If it is a directory
4043 and num_def_acls == 0 then remove the default acl. Else set the default acl
4044 on the directory.
4045 ****************************************************************************/
4046
4047 bool set_unix_posix_default_acl(connection_struct *conn, const char *fname, SMB_STRUCT_STAT *psbuf,
4048 uint16 num_def_acls, const char *pdata)
4049 {
4050 SMB_ACL_T def_acl = NULL;
4051
4052 if (num_def_acls && !S_ISDIR(psbuf->st_mode)) {
4053 DEBUG(5,("set_unix_posix_default_acl: Can't set default ACL on non-directory file %s\n", fname ));
4054 errno = EISDIR;
4055 return False;
4056 }
4057
4058 if (!num_def_acls) {
4059 /* Remove the default ACL. */
4060 if (SMB_VFS_SYS_ACL_DELETE_DEF_FILE(conn, fname) == -1) {
4061 DEBUG(5,("set_unix_posix_default_acl: acl_delete_def_file failed on directory %s (%s)\n",
4062 fname, strerror(errno) ));
4063 return False;
4064 }
4065 return True;
4066 }
4067
4068 if ((def_acl = create_posix_acl_from_wire(conn, num_def_acls, pdata)) == NULL) {
4069 return False;
4070 }
4071
4072 if (SMB_VFS_SYS_ACL_SET_FILE(conn, fname, SMB_ACL_TYPE_DEFAULT, def_acl) == -1) {
4073 DEBUG(5,("set_unix_posix_default_acl: acl_set_file failed on directory %s (%s)\n",
4074 fname, strerror(errno) ));
4075 SMB_VFS_SYS_ACL_FREE_ACL(conn, def_acl);
4076 return False;
4077 }
4078
4079 DEBUG(10,("set_unix_posix_default_acl: set default acl for file %s\n", fname ));
4080 SMB_VFS_SYS_ACL_FREE_ACL(conn, def_acl);
4081 return True;
4082 }
4083
4084 /****************************************************************************
4085 Remove an ACL from a file. As we don't have acl_delete_entry() available
4086 we must read the current acl and copy all entries except MASK, USER and GROUP
4087 to a new acl, then set that. This (at least on Linux) causes any ACL to be
4088 removed.
4089 FIXME ! How does the share mask/mode fit into this.... ?
4090 ****************************************************************************/
4091
4092 static bool remove_posix_acl(connection_struct *conn, files_struct *fsp, const char *fname)
4093 {
4094 SMB_ACL_T file_acl = NULL;
4095 int entry_id = SMB_ACL_FIRST_ENTRY;
4096 SMB_ACL_ENTRY_T entry;
4097 bool ret = False;
4098 /* Create a new ACL with only 3 entries, u/g/w. */
4099 SMB_ACL_T new_file_acl = SMB_VFS_SYS_ACL_INIT(conn, 3);
4100 SMB_ACL_ENTRY_T user_ent = NULL;
4101 SMB_ACL_ENTRY_T group_ent = NULL;
4102 SMB_ACL_ENTRY_T other_ent = NULL;
4103
4104 if (new_file_acl == NULL) {
4105 DEBUG(5,("remove_posix_acl: failed to init new ACL with 3 entries for file %s.\n", fname));
4106 return False;
4107 }
4108
4109 /* Now create the u/g/w entries. */
4110 if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &new_file_acl, &user_ent) == -1) {
4111 DEBUG(5,("remove_posix_acl: Failed to create user entry for file %s. (%s)\n",
4112 fname, strerror(errno) ));
4113 goto done;
4114 }
4115 if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, user_ent, SMB_ACL_USER_OBJ) == -1) {
4116 DEBUG(5,("remove_posix_acl: Failed to set user entry for file %s. (%s)\n",
4117 fname, strerror(errno) ));
4118 goto done;
4119 }
4120
4121 if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &new_file_acl, &group_ent) == -1) {
4122 DEBUG(5,("remove_posix_acl: Failed to create group entry for file %s. (%s)\n",
4123 fname, strerror(errno) ));
4124 goto done;
4125 }
4126 if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, group_ent, SMB_ACL_GROUP_OBJ) == -1) {
4127 DEBUG(5,("remove_posix_acl: Failed to set group entry for file %s. (%s)\n",
4128 fname, strerror(errno) ));
4129 goto done;
4130 }
4131
4132 if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &new_file_acl, &other_ent) == -1) {
4133 DEBUG(5,("remove_posix_acl: Failed to create other entry for file %s. (%s)\n",
4134 fname, strerror(errno) ));
4135 goto done;
4136 }
4137 if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, other_ent, SMB_ACL_OTHER) == -1) {
4138 DEBUG(5,("remove_posix_acl: Failed to set other entry for file %s. (%s)\n",
4139 fname, strerror(errno) ));
4140 goto done;
4141 }
4142
4143 /* Get the current file ACL. */
4144 if (fsp && fsp->fh->fd != -1) {
4145 file_acl = SMB_VFS_SYS_ACL_GET_FD(fsp);
4146 } else {
4147 file_acl = SMB_VFS_SYS_ACL_GET_FILE( conn, fname, SMB_ACL_TYPE_ACCESS);
4148 }
4149
4150 if (file_acl == NULL) {
4151 /* This is only returned if an error occurred. Even for a file with
4152 no acl a u/g/w acl should be returned. */
4153 DEBUG(5,("remove_posix_acl: failed to get ACL from file %s (%s).\n",
4154 fname, strerror(errno) ));
4155 goto done;
4156 }
4157
4158 while ( SMB_VFS_SYS_ACL_GET_ENTRY(conn, file_acl, entry_id, &entry) == 1) {
4159 SMB_ACL_TAG_T tagtype;
4160 SMB_ACL_PERMSET_T permset;
4161
4162 entry_id = SMB_ACL_NEXT_ENTRY;
4163
4164 if (SMB_VFS_SYS_ACL_GET_TAG_TYPE(conn, entry, &tagtype) == -1) {
4165 DEBUG(5,("remove_posix_acl: failed to get tagtype from ACL on file %s (%s).\n",
4166 fname, strerror(errno) ));
4167 goto done;
4168 }
4169
4170 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, entry, &permset) == -1) {
4171 DEBUG(5,("remove_posix_acl: failed to get permset from ACL on file %s (%s).\n",
4172 fname, strerror(errno) ));
4173 goto done;
4174 }
4175
4176 if (tagtype == SMB_ACL_USER_OBJ) {
4177 if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, user_ent, permset) == -1) {
4178 DEBUG(5,("remove_posix_acl: failed to set permset from ACL on file %s (%s).\n",
4179 fname, strerror(errno) ));
4180 }
4181 } else if (tagtype == SMB_ACL_GROUP_OBJ) {
4182 if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, group_ent, permset) == -1) {
4183 DEBUG(5,("remove_posix_acl: failed to set permset from ACL on file %s (%s).\n",
4184 fname, strerror(errno) ));
4185 }
4186 } else if (tagtype == SMB_ACL_OTHER) {
4187 if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, other_ent, permset) == -1) {
4188 DEBUG(5,("remove_posix_acl: failed to set permset from ACL on file %s (%s).\n",
4189 fname, strerror(errno) ));
4190 }
4191 }
4192 }
4193
4194 /* Set the new empty file ACL. */
4195 if (fsp && fsp->fh->fd != -1) {
4196 if (SMB_VFS_SYS_ACL_SET_FD(fsp, new_file_acl) == -1) {
4197 DEBUG(5,("remove_posix_acl: acl_set_file failed on %s (%s)\n",
4198 fname, strerror(errno) ));
4199 goto done;
4200 }
4201 } else {
4202 if (SMB_VFS_SYS_ACL_SET_FILE(conn, fname, SMB_ACL_TYPE_ACCESS, new_file_acl) == -1) {
4203 DEBUG(5,("remove_posix_acl: acl_set_file failed on %s (%s)\n",
4204 fname, strerror(errno) ));
4205 goto done;
4206 }
4207 }
4208
4209 ret = True;
4210
4211 done:
4212
4213 if (file_acl) {
4214 SMB_VFS_SYS_ACL_FREE_ACL(conn, file_acl);
4215 }
4216 if (new_file_acl) {
4217 SMB_VFS_SYS_ACL_FREE_ACL(conn, new_file_acl);
4218 }
4219 return ret;
4220 }
4221
4222 /****************************************************************************
4223 Calls from UNIX extensions - POSIX ACL set.
4224 If num_def_acls == 0 then read/modify/write acl after removing all entries
4225 except SMB_ACL_USER_OBJ, SMB_ACL_GROUP_OBJ, SMB_ACL_OTHER.
4226 ****************************************************************************/
4227
4228 bool set_unix_posix_acl(connection_struct *conn, files_struct *fsp, const char *fname, uint16 num_acls, const char *pdata)
4229 {
4230 SMB_ACL_T file_acl = NULL;
4231
4232 if (!num_acls) {
4233 /* Remove the ACL from the file. */
4234 return remove_posix_acl(conn, fsp, fname);
4235 }
4236
4237 if ((file_acl = create_posix_acl_from_wire(conn, num_acls, pdata)) == NULL) {
4238 return False;
4239 }
4240
4241 if (fsp && fsp->fh->fd != -1) {
4242 /* The preferred way - use an open fd. */
4243 if (SMB_VFS_SYS_ACL_SET_FD(fsp, file_acl) == -1) {
4244 DEBUG(5,("set_unix_posix_acl: acl_set_file failed on %s (%s)\n",
4245 fname, strerror(errno) ));
4246 SMB_VFS_SYS_ACL_FREE_ACL(conn, file_acl);
4247 return False;
4248 }
4249 } else {
4250 if (SMB_VFS_SYS_ACL_SET_FILE(conn, fname, SMB_ACL_TYPE_ACCESS, file_acl) == -1) {
4251 DEBUG(5,("set_unix_posix_acl: acl_set_file failed on %s (%s)\n",
4252 fname, strerror(errno) ));
4253 SMB_VFS_SYS_ACL_FREE_ACL(conn, file_acl);
4254 return False;
4255 }
4256 }
4257
4258 DEBUG(10,("set_unix_posix_acl: set acl for file %s\n", fname ));
4259 SMB_VFS_SYS_ACL_FREE_ACL(conn, file_acl);
4260 return True;
4261 }
4262
4263 /********************************************************************
4264 Pull the NT ACL from a file on disk or the OpenEventlog() access
4265 check. Caller is responsible for freeing the returned security
4266 descriptor via TALLOC_FREE(). This is designed for dealing with
4267 user space access checks in smbd outside of the VFS. For example,
4268 checking access rights in OpenEventlog().
4269
4270 Assume we are dealing with files (for now)
4271 ********************************************************************/
4272
4273 SEC_DESC *get_nt_acl_no_snum( TALLOC_CTX *ctx, const char *fname)
4274 {
4275 SEC_DESC *psd, *ret_sd;
4276 connection_struct *conn;
4277 files_struct finfo;
4278 struct fd_handle fh;
4279
4280 conn = TALLOC_ZERO_P(ctx, connection_struct);
4281 if (conn == NULL) {
4282 DEBUG(0, ("talloc failed\n"));
4283 return NULL;
4284 }
4285
4286 if (!(conn->params = TALLOC_P(conn, struct share_params))) {
4287 DEBUG(0,("get_nt_acl_no_snum: talloc() failed!\n"));
4288 TALLOC_FREE(conn);
4289 return NULL;
4290 }
4291
4292 conn->params->service = -1;
4293
4294 set_conn_connectpath(conn, "/");
4295
4296 if (!smbd_vfs_init(conn)) {
4297 DEBUG(0,("get_nt_acl_no_snum: Unable to create a fake connection struct!\n"));
4298 conn_free_internal( conn );
4299 return NULL;
4300 }
4301
4302 ZERO_STRUCT( finfo );
4303 ZERO_STRUCT( fh );
4304
4305 finfo.fnum = -1;
4306 finfo.conn = conn;
4307 finfo.fh = &fh;
4308 finfo.fh->fd = -1;
4309 finfo.fsp_name = CONST_DISCARD(char *,fname);
4310
4311 if (!NT_STATUS_IS_OK(SMB_VFS_FGET_NT_ACL( &finfo, DACL_SECURITY_INFORMATION, &psd))) {
4312 DEBUG(0,("get_nt_acl_no_snum: get_nt_acl returned zero.\n"));
4313 conn_free_internal( conn );
4314 return NULL;
4315 }
4316
4317 ret_sd = dup_sec_desc( ctx, psd );
4318
4319 conn_free_internal( conn );
4320
4321 return ret_sd;
4322 }