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Fix bug #6254 - PUT/GET produces an error in IPv6 to a smb-server(3.3)
[Samba.git] / source / smbd / posix_acls.c
blob1a90db384b7ed9f4818598e36a0ba14cddd7f006
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 static 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 static 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 SEC_ACCESS map_canon_ace_perms(int snum,
894 enum security_ace_type *pacl_type,
895 mode_t perms,
896 bool directory_ace)
897 {
898 SEC_ACCESS sa;
899 uint32 nt_mask = 0;
900
901 *pacl_type = SEC_ACE_TYPE_ACCESS_ALLOWED;
902
903 if (lp_acl_map_full_control(snum) && ((perms & ALL_ACE_PERMS) == ALL_ACE_PERMS)) {
904 if (directory_ace) {
905 nt_mask = UNIX_DIRECTORY_ACCESS_RWX;
906 } else {
907 nt_mask = UNIX_ACCESS_RWX;
908 }
909 } else if ((perms & ALL_ACE_PERMS) == (mode_t)0) {
910 /*
911 * Windows NT refuses to display ACEs with no permissions in them (but
912 * they are perfectly legal with Windows 2000). If the ACE has empty
913 * permissions we cannot use 0, so we use the otherwise unused
914 * WRITE_OWNER permission, which we ignore when we set an ACL.
915 * We abstract this into a #define of UNIX_ACCESS_NONE to allow this
916 * to be changed in the future.
917 */
918
919 if (nt4_compatible_acls())
920 nt_mask = UNIX_ACCESS_NONE;
921 else
922 nt_mask = 0;
923 } else {
924 if (directory_ace) {
925 nt_mask |= ((perms & S_IRUSR) ? UNIX_DIRECTORY_ACCESS_R : 0 );
926 nt_mask |= ((perms & S_IWUSR) ? UNIX_DIRECTORY_ACCESS_W : 0 );
927 nt_mask |= ((perms & S_IXUSR) ? UNIX_DIRECTORY_ACCESS_X : 0 );
928 } else {
929 nt_mask |= ((perms & S_IRUSR) ? UNIX_ACCESS_R : 0 );
930 nt_mask |= ((perms & S_IWUSR) ? UNIX_ACCESS_W : 0 );
931 nt_mask |= ((perms & S_IXUSR) ? UNIX_ACCESS_X : 0 );
932 }
933 }
934
935 DEBUG(10,("map_canon_ace_perms: Mapped (UNIX) %x to (NT) %x\n",
936 (unsigned int)perms, (unsigned int)nt_mask ));
937
938 init_sec_access(&sa,nt_mask);
939 return sa;
940 }
941
942 /****************************************************************************
943 Map NT perms to a UNIX mode_t.
944 ****************************************************************************/
945
946 #define FILE_SPECIFIC_READ_BITS (FILE_READ_DATA|FILE_READ_EA|FILE_READ_ATTRIBUTES)
947 #define FILE_SPECIFIC_WRITE_BITS (FILE_WRITE_DATA|FILE_APPEND_DATA|FILE_WRITE_EA|FILE_WRITE_ATTRIBUTES)
948 #define FILE_SPECIFIC_EXECUTE_BITS (FILE_EXECUTE)
949
950 static mode_t map_nt_perms( uint32 *mask, int type)
951 {
952 mode_t mode = 0;
953
954 switch(type) {
955 case S_IRUSR:
956 if((*mask) & GENERIC_ALL_ACCESS)
957 mode = S_IRUSR|S_IWUSR|S_IXUSR;
958 else {
959 mode |= ((*mask) & (GENERIC_READ_ACCESS|FILE_SPECIFIC_READ_BITS)) ? S_IRUSR : 0;
960 mode |= ((*mask) & (GENERIC_WRITE_ACCESS|FILE_SPECIFIC_WRITE_BITS)) ? S_IWUSR : 0;
961 mode |= ((*mask) & (GENERIC_EXECUTE_ACCESS|FILE_SPECIFIC_EXECUTE_BITS)) ? S_IXUSR : 0;
962 }
963 break;
964 case S_IRGRP:
965 if((*mask) & GENERIC_ALL_ACCESS)
966 mode = S_IRGRP|S_IWGRP|S_IXGRP;
967 else {
968 mode |= ((*mask) & (GENERIC_READ_ACCESS|FILE_SPECIFIC_READ_BITS)) ? S_IRGRP : 0;
969 mode |= ((*mask) & (GENERIC_WRITE_ACCESS|FILE_SPECIFIC_WRITE_BITS)) ? S_IWGRP : 0;
970 mode |= ((*mask) & (GENERIC_EXECUTE_ACCESS|FILE_SPECIFIC_EXECUTE_BITS)) ? S_IXGRP : 0;
971 }
972 break;
973 case S_IROTH:
974 if((*mask) & GENERIC_ALL_ACCESS)
975 mode = S_IROTH|S_IWOTH|S_IXOTH;
976 else {
977 mode |= ((*mask) & (GENERIC_READ_ACCESS|FILE_SPECIFIC_READ_BITS)) ? S_IROTH : 0;
978 mode |= ((*mask) & (GENERIC_WRITE_ACCESS|FILE_SPECIFIC_WRITE_BITS)) ? S_IWOTH : 0;
979 mode |= ((*mask) & (GENERIC_EXECUTE_ACCESS|FILE_SPECIFIC_EXECUTE_BITS)) ? S_IXOTH : 0;
980 }
981 break;
982 }
983
984 return mode;
985 }
986
987 /****************************************************************************
988 Unpack a SEC_DESC into a UNIX owner and group.
989 ****************************************************************************/
990
991 NTSTATUS unpack_nt_owners(int snum, uid_t *puser, gid_t *pgrp, uint32 security_info_sent, SEC_DESC *psd)
992 {
993 DOM_SID owner_sid;
994 DOM_SID grp_sid;
995
996 *puser = (uid_t)-1;
997 *pgrp = (gid_t)-1;
998
999 if(security_info_sent == 0) {
1000 DEBUG(0,("unpack_nt_owners: no security info sent !\n"));
1001 return NT_STATUS_OK;
1002 }
1003
1004 /*
1005 * Validate the owner and group SID's.
1006 */
1007
1008 memset(&owner_sid, '\0', sizeof(owner_sid));
1009 memset(&grp_sid, '\0', sizeof(grp_sid));
1010
1011 DEBUG(5,("unpack_nt_owners: validating owner_sids.\n"));
1012
1013 /*
1014 * Don't immediately fail if the owner sid cannot be validated.
1015 * This may be a group chown only set.
1016 */
1017
1018 if (security_info_sent & OWNER_SECURITY_INFORMATION) {
1019 sid_copy(&owner_sid, psd->owner_sid);
1020 if (!sid_to_uid(&owner_sid, puser)) {
1021 if (lp_force_unknown_acl_user(snum)) {
1022 /* this allows take ownership to work
1023 * reasonably */
1024 *puser = current_user.ut.uid;
1025 } else {
1026 DEBUG(3,("unpack_nt_owners: unable to validate"
1027 " owner sid for %s\n",
1028 sid_string_dbg(&owner_sid)));
1029 return NT_STATUS_INVALID_OWNER;
1030 }
1031 }
1032 DEBUG(3,("unpack_nt_owners: owner sid mapped to uid %u\n",
1033 (unsigned int)*puser ));
1034 }
1035
1036 /*
1037 * Don't immediately fail if the group sid cannot be validated.
1038 * This may be an owner chown only set.
1039 */
1040
1041 if (security_info_sent & GROUP_SECURITY_INFORMATION) {
1042 sid_copy(&grp_sid, psd->group_sid);
1043 if (!sid_to_gid( &grp_sid, pgrp)) {
1044 if (lp_force_unknown_acl_user(snum)) {
1045 /* this allows take group ownership to work
1046 * reasonably */
1047 *pgrp = current_user.ut.gid;
1048 } else {
1049 DEBUG(3,("unpack_nt_owners: unable to validate"
1050 " group sid.\n"));
1051 return NT_STATUS_INVALID_OWNER;
1052 }
1053 }
1054 DEBUG(3,("unpack_nt_owners: group sid mapped to gid %u\n",
1055 (unsigned int)*pgrp));
1056 }
1057
1058 DEBUG(5,("unpack_nt_owners: owner_sids validated.\n"));
1059
1060 return NT_STATUS_OK;
1061 }
1062
1063 /****************************************************************************
1064 Ensure the enforced permissions for this share apply.
1065 ****************************************************************************/
1066
1067 static void apply_default_perms(const struct share_params *params,
1068 const bool is_directory, canon_ace *pace,
1069 mode_t type)
1070 {
1071 mode_t and_bits = (mode_t)0;
1072 mode_t or_bits = (mode_t)0;
1073
1074 /* Get the initial bits to apply. */
1075
1076 if (is_directory) {
1077 and_bits = lp_dir_security_mask(params->service);
1078 or_bits = lp_force_dir_security_mode(params->service);
1079 } else {
1080 and_bits = lp_security_mask(params->service);
1081 or_bits = lp_force_security_mode(params->service);
1082 }
1083
1084 /* Now bounce them into the S_USR space. */
1085 switch(type) {
1086 case S_IRUSR:
1087 /* Ensure owner has read access. */
1088 pace->perms |= S_IRUSR;
1089 if (is_directory)
1090 pace->perms |= (S_IWUSR|S_IXUSR);
1091 and_bits = unix_perms_to_acl_perms(and_bits, S_IRUSR, S_IWUSR, S_IXUSR);
1092 or_bits = unix_perms_to_acl_perms(or_bits, S_IRUSR, S_IWUSR, S_IXUSR);
1093 break;
1094 case S_IRGRP:
1095 and_bits = unix_perms_to_acl_perms(and_bits, S_IRGRP, S_IWGRP, S_IXGRP);
1096 or_bits = unix_perms_to_acl_perms(or_bits, S_IRGRP, S_IWGRP, S_IXGRP);
1097 break;
1098 case S_IROTH:
1099 and_bits = unix_perms_to_acl_perms(and_bits, S_IROTH, S_IWOTH, S_IXOTH);
1100 or_bits = unix_perms_to_acl_perms(or_bits, S_IROTH, S_IWOTH, S_IXOTH);
1101 break;
1102 }
1103
1104 pace->perms = ((pace->perms & and_bits)|or_bits);
1105 }
1106
1107 /****************************************************************************
1108 Check if a given uid/SID is in a group gid/SID. This is probably very
1109 expensive and will need optimisation. A *lot* of optimisation :-). JRA.
1110 ****************************************************************************/
1111
1112 static bool uid_entry_in_group( canon_ace *uid_ace, canon_ace *group_ace )
1113 {
1114 const char *u_name = NULL;
1115
1116 /* "Everyone" always matches every uid. */
1117
1118 if (sid_equal(&group_ace->trustee, &global_sid_World))
1119 return True;
1120
1121 /* Assume that the current user is in the current group (force group) */
1122
1123 if (uid_ace->unix_ug.uid == current_user.ut.uid && group_ace->unix_ug.gid == current_user.ut.gid)
1124 return True;
1125
1126 /* u_name talloc'ed off tos. */
1127 u_name = uidtoname(uid_ace->unix_ug.uid);
1128 if (!u_name) {
1129 return False;
1130 }
1131 return user_in_group_sid(u_name, &group_ace->trustee);
1132 }
1133
1134 /****************************************************************************
1135 A well formed POSIX file or default ACL has at least 3 entries, a
1136 SMB_ACL_USER_OBJ, SMB_ACL_GROUP_OBJ, SMB_ACL_OTHER_OBJ.
1137 In addition, the owner must always have at least read access.
1138 When using this call on get_acl, the pst struct is valid and contains
1139 the mode of the file. When using this call on set_acl, the pst struct has
1140 been modified to have a mode containing the default for this file or directory
1141 type.
1142 ****************************************************************************/
1143
1144 static bool ensure_canon_entry_valid(canon_ace **pp_ace,
1145 const struct share_params *params,
1146 const bool is_directory,
1147 const DOM_SID *pfile_owner_sid,
1148 const DOM_SID *pfile_grp_sid,
1149 const SMB_STRUCT_STAT *pst,
1150 bool setting_acl)
1151 {
1152 canon_ace *pace;
1153 bool got_user = False;
1154 bool got_grp = False;
1155 bool got_other = False;
1156 canon_ace *pace_other = NULL;
1157
1158 for (pace = *pp_ace; pace; pace = pace->next) {
1159 if (pace->type == SMB_ACL_USER_OBJ) {
1160
1161 if (setting_acl)
1162 apply_default_perms(params, is_directory, pace, S_IRUSR);
1163 got_user = True;
1164
1165 } else if (pace->type == SMB_ACL_GROUP_OBJ) {
1166
1167 /*
1168 * Ensure create mask/force create mode is respected on set.
1169 */
1170
1171 if (setting_acl)
1172 apply_default_perms(params, is_directory, pace, S_IRGRP);
1173 got_grp = True;
1174
1175 } else if (pace->type == SMB_ACL_OTHER) {
1176
1177 /*
1178 * Ensure create mask/force create mode is respected on set.
1179 */
1180
1181 if (setting_acl)
1182 apply_default_perms(params, is_directory, pace, S_IROTH);
1183 got_other = True;
1184 pace_other = pace;
1185 }
1186 }
1187
1188 if (!got_user) {
1189 if ((pace = SMB_MALLOC_P(canon_ace)) == NULL) {
1190 DEBUG(0,("ensure_canon_entry_valid: malloc fail.\n"));
1191 return False;
1192 }
1193
1194 ZERO_STRUCTP(pace);
1195 pace->type = SMB_ACL_USER_OBJ;
1196 pace->owner_type = UID_ACE;
1197 pace->unix_ug.uid = pst->st_uid;
1198 pace->trustee = *pfile_owner_sid;
1199 pace->attr = ALLOW_ACE;
1200
1201 if (setting_acl) {
1202 /* See if the owning user is in any of the other groups in
1203 the ACE. If so, OR in the permissions from that group. */
1204
1205 bool group_matched = False;
1206 canon_ace *pace_iter;
1207
1208 for (pace_iter = *pp_ace; pace_iter; pace_iter = pace_iter->next) {
1209 if (pace_iter->type == SMB_ACL_GROUP_OBJ || pace_iter->type == SMB_ACL_GROUP) {
1210 if (uid_entry_in_group(pace, pace_iter)) {
1211 pace->perms |= pace_iter->perms;
1212 group_matched = True;
1213 }
1214 }
1215 }
1216
1217 /* If we only got an "everyone" perm, just use that. */
1218 if (!group_matched) {
1219 if (got_other)
1220 pace->perms = pace_other->perms;
1221 else
1222 pace->perms = 0;
1223 }
1224
1225 apply_default_perms(params, is_directory, pace, S_IRUSR);
1226 } else {
1227 pace->perms = unix_perms_to_acl_perms(pst->st_mode, S_IRUSR, S_IWUSR, S_IXUSR);
1228 }
1229
1230 DLIST_ADD(*pp_ace, pace);
1231 }
1232
1233 if (!got_grp) {
1234 if ((pace = SMB_MALLOC_P(canon_ace)) == NULL) {
1235 DEBUG(0,("ensure_canon_entry_valid: malloc fail.\n"));
1236 return False;
1237 }
1238
1239 ZERO_STRUCTP(pace);
1240 pace->type = SMB_ACL_GROUP_OBJ;
1241 pace->owner_type = GID_ACE;
1242 pace->unix_ug.uid = pst->st_gid;
1243 pace->trustee = *pfile_grp_sid;
1244 pace->attr = ALLOW_ACE;
1245 if (setting_acl) {
1246 /* If we only got an "everyone" perm, just use that. */
1247 if (got_other)
1248 pace->perms = pace_other->perms;
1249 else
1250 pace->perms = 0;
1251 apply_default_perms(params, is_directory, pace, S_IRGRP);
1252 } else {
1253 pace->perms = unix_perms_to_acl_perms(pst->st_mode, S_IRGRP, S_IWGRP, S_IXGRP);
1254 }
1255
1256 DLIST_ADD(*pp_ace, pace);
1257 }
1258
1259 if (!got_other) {
1260 if ((pace = SMB_MALLOC_P(canon_ace)) == NULL) {
1261 DEBUG(0,("ensure_canon_entry_valid: malloc fail.\n"));
1262 return False;
1263 }
1264
1265 ZERO_STRUCTP(pace);
1266 pace->type = SMB_ACL_OTHER;
1267 pace->owner_type = WORLD_ACE;
1268 pace->unix_ug.world = -1;
1269 pace->trustee = global_sid_World;
1270 pace->attr = ALLOW_ACE;
1271 if (setting_acl) {
1272 pace->perms = 0;
1273 apply_default_perms(params, is_directory, pace, S_IROTH);
1274 } else
1275 pace->perms = unix_perms_to_acl_perms(pst->st_mode, S_IROTH, S_IWOTH, S_IXOTH);
1276
1277 DLIST_ADD(*pp_ace, pace);
1278 }
1279
1280 return True;
1281 }
1282
1283 /****************************************************************************
1284 Check if a POSIX ACL has the required SMB_ACL_USER_OBJ and SMB_ACL_GROUP_OBJ entries.
1285 If it does not have them, check if there are any entries where the trustee is the
1286 file owner or the owning group, and map these to SMB_ACL_USER_OBJ and SMB_ACL_GROUP_OBJ.
1287 ****************************************************************************/
1288
1289 static void check_owning_objs(canon_ace *ace, DOM_SID *pfile_owner_sid, DOM_SID *pfile_grp_sid)
1290 {
1291 bool got_user_obj, got_group_obj;
1292 canon_ace *current_ace;
1293 int i, entries;
1294
1295 entries = count_canon_ace_list(ace);
1296 got_user_obj = False;
1297 got_group_obj = False;
1298
1299 for (i=0, current_ace = ace; i < entries; i++, current_ace = current_ace->next) {
1300 if (current_ace->type == SMB_ACL_USER_OBJ)
1301 got_user_obj = True;
1302 else if (current_ace->type == SMB_ACL_GROUP_OBJ)
1303 got_group_obj = True;
1304 }
1305 if (got_user_obj && got_group_obj) {
1306 DEBUG(10,("check_owning_objs: ACL had owning user/group entries.\n"));
1307 return;
1308 }
1309
1310 for (i=0, current_ace = ace; i < entries; i++, current_ace = current_ace->next) {
1311 if (!got_user_obj && current_ace->owner_type == UID_ACE &&
1312 sid_equal(&current_ace->trustee, pfile_owner_sid)) {
1313 current_ace->type = SMB_ACL_USER_OBJ;
1314 got_user_obj = True;
1315 }
1316 if (!got_group_obj && current_ace->owner_type == GID_ACE &&
1317 sid_equal(&current_ace->trustee, pfile_grp_sid)) {
1318 current_ace->type = SMB_ACL_GROUP_OBJ;
1319 got_group_obj = True;
1320 }
1321 }
1322 if (!got_user_obj)
1323 DEBUG(10,("check_owning_objs: ACL is missing an owner entry.\n"));
1324 if (!got_group_obj)
1325 DEBUG(10,("check_owning_objs: ACL is missing an owning group entry.\n"));
1326 }
1327
1328 /****************************************************************************
1329 Unpack a SEC_DESC into two canonical ace lists.
1330 ****************************************************************************/
1331
1332 static bool create_canon_ace_lists(files_struct *fsp, SMB_STRUCT_STAT *pst,
1333 DOM_SID *pfile_owner_sid,
1334 DOM_SID *pfile_grp_sid,
1335 canon_ace **ppfile_ace, canon_ace **ppdir_ace,
1336 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, canon_ace **ppdir_ace,
2024 uint32 security_info_sent, SEC_DESC *psd)
2025 {
2026 canon_ace *file_ace = NULL;
2027 canon_ace *dir_ace = NULL;
2028
2029 *ppfile_ace = NULL;
2030 *ppdir_ace = NULL;
2031
2032 if(security_info_sent == 0) {
2033 DEBUG(0,("unpack_canon_ace: no security info sent !\n"));
2034 return False;
2035 }
2036
2037 /*
2038 * If no DACL then this is a chown only security descriptor.
2039 */
2040
2041 if(!(security_info_sent & DACL_SECURITY_INFORMATION) || !psd->dacl)
2042 return True;
2043
2044 /*
2045 * Now go through the DACL and create the canon_ace lists.
2046 */
2047
2048 if (!create_canon_ace_lists( fsp, pst, pfile_owner_sid, pfile_grp_sid,
2049 &file_ace, &dir_ace, psd->dacl))
2050 return False;
2051
2052 if ((file_ace == NULL) && (dir_ace == NULL)) {
2053 /* W2K traverse DACL set - ignore. */
2054 return True;
2055 }
2056
2057 /*
2058 * Go through the canon_ace list and merge entries
2059 * belonging to identical users of identical allow or deny type.
2060 * We can do this as all deny entries come first, followed by
2061 * all allow entries (we have mandated this before accepting this acl).
2062 */
2063
2064 print_canon_ace_list( "file ace - before merge", file_ace);
2065 merge_aces( &file_ace );
2066
2067 print_canon_ace_list( "dir ace - before merge", dir_ace);
2068 merge_aces( &dir_ace );
2069
2070 /*
2071 * NT ACLs are order dependent. Go through the acl lists and
2072 * process DENY entries by masking the allow entries.
2073 */
2074
2075 print_canon_ace_list( "file ace - before deny", file_ace);
2076 process_deny_list( &file_ace);
2077
2078 print_canon_ace_list( "dir ace - before deny", dir_ace);
2079 process_deny_list( &dir_ace);
2080
2081 /*
2082 * A well formed POSIX file or default ACL has at least 3 entries, a
2083 * SMB_ACL_USER_OBJ, SMB_ACL_GROUP_OBJ, SMB_ACL_OTHER_OBJ
2084 * and optionally a mask entry. Ensure this is the case.
2085 */
2086
2087 print_canon_ace_list( "file ace - before valid", file_ace);
2088
2089 /*
2090 * A default 3 element mode entry for a file should be r-- --- ---.
2091 * A default 3 element mode entry for a directory should be rwx --- ---.
2092 */
2093
2094 pst->st_mode = create_default_mode(fsp, False);
2095
2096 if (!ensure_canon_entry_valid(&file_ace, fsp->conn->params, fsp->is_directory, pfile_owner_sid, pfile_grp_sid, pst, True)) {
2097 free_canon_ace_list(file_ace);
2098 free_canon_ace_list(dir_ace);
2099 return False;
2100 }
2101
2102 print_canon_ace_list( "dir ace - before valid", dir_ace);
2103
2104 /*
2105 * A default inheritable 3 element mode entry for a directory should be the
2106 * mode Samba will use to create a file within. Ensure user rwx bits are set if
2107 * it's a directory.
2108 */
2109
2110 pst->st_mode = create_default_mode(fsp, True);
2111
2112 if (dir_ace && !ensure_canon_entry_valid(&dir_ace, fsp->conn->params, fsp->is_directory, pfile_owner_sid, pfile_grp_sid, pst, True)) {
2113 free_canon_ace_list(file_ace);
2114 free_canon_ace_list(dir_ace);
2115 return False;
2116 }
2117
2118 print_canon_ace_list( "file ace - return", file_ace);
2119 print_canon_ace_list( "dir ace - return", dir_ace);
2120
2121 *ppfile_ace = file_ace;
2122 *ppdir_ace = dir_ace;
2123 return True;
2124
2125 }
2126
2127 /******************************************************************************
2128 When returning permissions, try and fit NT display
2129 semantics if possible. Note the the canon_entries here must have been malloced.
2130 The list format should be - first entry = owner, followed by group and other user
2131 entries, last entry = other.
2132
2133 Note that this doesn't exactly match the NT semantics for an ACL. As POSIX entries
2134 are not ordered, and match on the most specific entry rather than walking a list,
2135 then a simple POSIX permission of rw-r--r-- should really map to 5 entries,
2136
2137 Entry 0: owner : deny all except read and write.
2138 Entry 1: owner : allow read and write.
2139 Entry 2: group : deny all except read.
2140 Entry 3: group : allow read.
2141 Entry 4: Everyone : allow read.
2142
2143 But NT cannot display this in their ACL editor !
2144 ********************************************************************************/
2145
2146 static void arrange_posix_perms(const char *filename, canon_ace **pp_list_head)
2147 {
2148 canon_ace *list_head = *pp_list_head;
2149 canon_ace *owner_ace = NULL;
2150 canon_ace *other_ace = NULL;
2151 canon_ace *ace = NULL;
2152
2153 for (ace = list_head; ace; ace = ace->next) {
2154 if (ace->type == SMB_ACL_USER_OBJ)
2155 owner_ace = ace;
2156 else if (ace->type == SMB_ACL_OTHER) {
2157 /* Last ace - this is "other" */
2158 other_ace = ace;
2159 }
2160 }
2161
2162 if (!owner_ace || !other_ace) {
2163 DEBUG(0,("arrange_posix_perms: Invalid POSIX permissions for file %s, missing owner or other.\n",
2164 filename ));
2165 return;
2166 }
2167
2168 /*
2169 * The POSIX algorithm applies to owner first, and other last,
2170 * so ensure they are arranged in this order.
2171 */
2172
2173 if (owner_ace) {
2174 DLIST_PROMOTE(list_head, owner_ace);
2175 }
2176
2177 if (other_ace) {
2178 DLIST_DEMOTE(list_head, other_ace, canon_ace *);
2179 }
2180
2181 /* We have probably changed the head of the list. */
2182
2183 *pp_list_head = list_head;
2184 }
2185
2186 /****************************************************************************
2187 Create a linked list of canonical ACE entries.
2188 ****************************************************************************/
2189
2190 static canon_ace *canonicalise_acl(struct connection_struct *conn,
2191 const char *fname, SMB_ACL_T posix_acl,
2192 const SMB_STRUCT_STAT *psbuf,
2193 const DOM_SID *powner, const DOM_SID *pgroup, struct pai_val *pal, SMB_ACL_TYPE_T the_acl_type)
2194 {
2195 mode_t acl_mask = (S_IRUSR|S_IWUSR|S_IXUSR);
2196 canon_ace *list_head = NULL;
2197 canon_ace *ace = NULL;
2198 canon_ace *next_ace = NULL;
2199 int entry_id = SMB_ACL_FIRST_ENTRY;
2200 SMB_ACL_ENTRY_T entry;
2201 size_t ace_count;
2202
2203 while ( posix_acl && (SMB_VFS_SYS_ACL_GET_ENTRY(conn, posix_acl, entry_id, &entry) == 1)) {
2204 SMB_ACL_TAG_T tagtype;
2205 SMB_ACL_PERMSET_T permset;
2206 DOM_SID sid;
2207 posix_id unix_ug;
2208 enum ace_owner owner_type;
2209
2210 /* get_next... */
2211 if (entry_id == SMB_ACL_FIRST_ENTRY)
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 SEC_ACCESS acc;
2964
2965 acc = map_canon_ace_perms(SNUM(conn),
2966 &nt_acl_type,
2967 ace->perms,
2968 S_ISDIR(sbuf->st_mode));
2969 init_sec_ace(&nt_ace_list[num_aces++],
2970 &ace->trustee,
2971 nt_acl_type,
2972 acc,
2973 ace->inherited ?
2974 SEC_ACE_FLAG_INHERITED_ACE : 0);
2975 }
2976
2977 /* The User must have access to a profile share - even
2978 * if we can't map the SID. */
2979 if (lp_profile_acls(SNUM(conn))) {
2980 SEC_ACCESS acc;
2981
2982 init_sec_access(&acc,FILE_GENERIC_ALL);
2983 init_sec_ace(&nt_ace_list[num_aces++],
2984 &global_sid_Builtin_Users,
2985 SEC_ACE_TYPE_ACCESS_ALLOWED,
2986 acc, 0);
2987 }
2988
2989 for (ace = dir_ace; ace != NULL; ace = ace->next) {
2990 SEC_ACCESS acc;
2991
2992 acc = map_canon_ace_perms(SNUM(conn),
2993 &nt_acl_type,
2994 ace->perms,
2995 S_ISDIR(sbuf->st_mode));
2996 init_sec_ace(&nt_ace_list[num_aces++],
2997 &ace->trustee,
2998 nt_acl_type,
2999 acc,
3000 SEC_ACE_FLAG_OBJECT_INHERIT|
3001 SEC_ACE_FLAG_CONTAINER_INHERIT|
3002 SEC_ACE_FLAG_INHERIT_ONLY|
3003 (ace->inherited ?
3004 SEC_ACE_FLAG_INHERITED_ACE : 0));
3005 }
3006
3007 /* The User must have access to a profile share - even
3008 * if we can't map the SID. */
3009 if (lp_profile_acls(SNUM(conn))) {
3010 SEC_ACCESS acc;
3011
3012 init_sec_access(&acc,FILE_GENERIC_ALL);
3013 init_sec_ace(&nt_ace_list[num_aces++], &global_sid_Builtin_Users, SEC_ACE_TYPE_ACCESS_ALLOWED, acc,
3014 SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT|
3015 SEC_ACE_FLAG_INHERIT_ONLY|0);
3016 }
3017
3018 /*
3019 * Merge POSIX default ACLs and normal ACLs into one NT ACE.
3020 * Win2K needs this to get the inheritance correct when replacing ACLs
3021 * on a directory tree. Based on work by Jim @ IBM.
3022 */
3023
3024 num_aces = merge_default_aces(nt_ace_list, num_aces);
3025
3026 }
3027
3028 if (num_aces) {
3029 if((psa = make_sec_acl( talloc_tos(), NT4_ACL_REVISION, num_aces, nt_ace_list)) == NULL) {
3030 DEBUG(0,("get_nt_acl: Unable to malloc space for acl.\n"));
3031 goto done;
3032 }
3033 }
3034 } /* security_info & DACL_SECURITY_INFORMATION */
3035
3036 psd = make_standard_sec_desc( talloc_tos(),
3037 (security_info & OWNER_SECURITY_INFORMATION) ? &owner_sid : NULL,
3038 (security_info & GROUP_SECURITY_INFORMATION) ? &group_sid : NULL,
3039 psa,
3040 &sd_size);
3041
3042 if(!psd) {
3043 DEBUG(0,("get_nt_acl: Unable to malloc space for security descriptor.\n"));
3044 sd_size = 0;
3045 goto done;
3046 }
3047
3048 /*
3049 * Windows 2000: The DACL_PROTECTED flag in the security
3050 * descriptor marks the ACL as non-inheriting, i.e., no
3051 * ACEs from higher level directories propagate to this
3052 * ACL. In the POSIX ACL model permissions are only
3053 * inherited at file create time, so ACLs never contain
3054 * any ACEs that are inherited dynamically. The DACL_PROTECTED
3055 * flag doesn't seem to bother Windows NT.
3056 * Always set this if map acl inherit is turned off.
3057 */
3058 if (get_protected_flag(pal) || !lp_map_acl_inherit(SNUM(conn))) {
3059 psd->type |= SE_DESC_DACL_PROTECTED;
3060 }
3061
3062 if (psd->dacl) {
3063 dacl_sort_into_canonical_order(psd->dacl->aces, (unsigned int)psd->dacl->num_aces);
3064 }
3065
3066 *ppdesc = psd;
3067
3068 done:
3069
3070 if (posix_acl) {
3071 SMB_VFS_SYS_ACL_FREE_ACL(conn, posix_acl);
3072 }
3073 if (def_acl) {
3074 SMB_VFS_SYS_ACL_FREE_ACL(conn, def_acl);
3075 }
3076 free_canon_ace_list(file_ace);
3077 free_canon_ace_list(dir_ace);
3078 free_inherited_info(pal);
3079 SAFE_FREE(nt_ace_list);
3080
3081 return NT_STATUS_OK;
3082 }
3083
3084 NTSTATUS posix_fget_nt_acl(struct files_struct *fsp, uint32_t security_info,
3085 SEC_DESC **ppdesc)
3086 {
3087 SMB_STRUCT_STAT sbuf;
3088 SMB_ACL_T posix_acl = NULL;
3089 struct pai_val *pal;
3090
3091 *ppdesc = NULL;
3092
3093 DEBUG(10,("posix_fget_nt_acl: called for file %s\n", fsp->fsp_name ));
3094
3095 /* can it happen that fsp_name == NULL ? */
3096 if (fsp->is_directory || fsp->fh->fd == -1) {
3097 return posix_get_nt_acl(fsp->conn, fsp->fsp_name,
3098 security_info, ppdesc);
3099 }
3100
3101 /* Get the stat struct for the owner info. */
3102 if(SMB_VFS_FSTAT(fsp, &sbuf) != 0) {
3103 return map_nt_error_from_unix(errno);
3104 }
3105
3106 /* Get the ACL from the fd. */
3107 posix_acl = SMB_VFS_SYS_ACL_GET_FD(fsp);
3108
3109 pal = fload_inherited_info(fsp);
3110
3111 return posix_get_nt_acl_common(fsp->conn, fsp->fsp_name, &sbuf, pal,
3112 posix_acl, NULL, security_info, ppdesc);
3113 }
3114
3115 NTSTATUS posix_get_nt_acl(struct connection_struct *conn, const char *name,
3116 uint32_t security_info, SEC_DESC **ppdesc)
3117 {
3118 SMB_STRUCT_STAT sbuf;
3119 SMB_ACL_T posix_acl = NULL;
3120 SMB_ACL_T def_acl = NULL;
3121 struct pai_val *pal;
3122
3123 *ppdesc = NULL;
3124
3125 DEBUG(10,("posix_get_nt_acl: called for file %s\n", name ));
3126
3127 /* Get the stat struct for the owner info. */
3128 if(SMB_VFS_STAT(conn, name, &sbuf) != 0) {
3129 return map_nt_error_from_unix(errno);
3130 }
3131
3132 /* Get the ACL from the path. */
3133 posix_acl = SMB_VFS_SYS_ACL_GET_FILE(conn, name, SMB_ACL_TYPE_ACCESS);
3134
3135 /* If it's a directory get the default POSIX ACL. */
3136 if(S_ISDIR(sbuf.st_mode)) {
3137 def_acl = SMB_VFS_SYS_ACL_GET_FILE(conn, name, SMB_ACL_TYPE_DEFAULT);
3138 def_acl = free_empty_sys_acl(conn, def_acl);
3139 }
3140
3141 pal = load_inherited_info(conn, name);
3142
3143 return posix_get_nt_acl_common(conn, name, &sbuf, pal, posix_acl,
3144 def_acl, security_info, ppdesc);
3145 }
3146
3147 /****************************************************************************
3148 Try to chown a file. We will be able to chown it under the following conditions.
3149
3150 1) If we have root privileges, then it will just work.
3151 2) If we have SeTakeOwnershipPrivilege we can change the user to the current user.
3152 3) If we have SeRestorePrivilege we can change the user to any other user.
3153 4) If we have write permission to the file and dos_filemodes is set
3154 then allow chown to the currently authenticated user.
3155 ****************************************************************************/
3156
3157 int try_chown(connection_struct *conn, const char *fname, uid_t uid, gid_t gid)
3158 {
3159 int ret;
3160 files_struct *fsp;
3161 SMB_STRUCT_STAT st;
3162
3163 if(!CAN_WRITE(conn)) {
3164 return -1;
3165 }
3166
3167 /* Case (1). */
3168 /* try the direct way first */
3169 ret = SMB_VFS_CHOWN(conn, fname, uid, gid);
3170 if (ret == 0)
3171 return 0;
3172
3173 /* Case (2) / (3) */
3174 if (lp_enable_privileges()) {
3175
3176 bool has_take_ownership_priv = user_has_privileges(current_user.nt_user_token,
3177 &se_take_ownership);
3178 bool has_restore_priv = user_has_privileges(current_user.nt_user_token,
3179 &se_restore);
3180
3181 /* Case (2) */
3182 if ( ( has_take_ownership_priv && ( uid == current_user.ut.uid ) ) ||
3183 /* Case (3) */
3184 ( has_restore_priv ) ) {
3185
3186 become_root();
3187 /* Keep the current file gid the same - take ownership doesn't imply group change. */
3188 ret = SMB_VFS_CHOWN(conn, fname, uid, (gid_t)-1);
3189 unbecome_root();
3190 return ret;
3191 }
3192 }
3193
3194 /* Case (4). */
3195 if (!lp_dos_filemode(SNUM(conn))) {
3196 errno = EPERM;
3197 return -1;
3198 }
3199
3200 /* only allow chown to the current user. This is more secure,
3201 and also copes with the case where the SID in a take ownership ACL is
3202 a local SID on the users workstation
3203 */
3204 if (uid != current_user.ut.uid) {
3205 errno = EPERM;
3206 return -1;
3207 }
3208
3209 if (SMB_VFS_STAT(conn,fname,&st)) {
3210 return -1;
3211 }
3212
3213 if (!NT_STATUS_IS_OK(open_file_fchmod(conn,fname,&st,&fsp))) {
3214 return -1;
3215 }
3216
3217 become_root();
3218 /* Keep the current file gid the same. */
3219 ret = SMB_VFS_FCHOWN(fsp, uid, (gid_t)-1);
3220 unbecome_root();
3221
3222 close_file_fchmod(fsp);
3223
3224 return ret;
3225 }
3226
3227 #if 0
3228 /* Disable this - prevents ACL inheritance from the ACL editor. JRA. */
3229
3230 /****************************************************************************
3231 Take care of parent ACL inheritance.
3232 ****************************************************************************/
3233
3234 static NTSTATUS append_parent_acl(files_struct *fsp,
3235 SMB_STRUCT_STAT *psbuf,
3236 SEC_DESC *psd,
3237 SEC_DESC **pp_new_sd)
3238 {
3239 SEC_DESC *parent_sd = NULL;
3240 files_struct *parent_fsp = NULL;
3241 TALLOC_CTX *mem_ctx = talloc_parent(psd);
3242 char *parent_name = NULL;
3243 SEC_ACE *new_ace = NULL;
3244 unsigned int num_aces = psd->dacl->num_aces;
3245 SMB_STRUCT_STAT sbuf;
3246 NTSTATUS status;
3247 int info;
3248 unsigned int i, j;
3249 bool is_dacl_protected = (psd->type & SE_DESC_DACL_PROTECTED);
3250
3251 ZERO_STRUCT(sbuf);
3252
3253 if (mem_ctx == NULL) {
3254 return NT_STATUS_NO_MEMORY;
3255 }
3256
3257 if (!parent_dirname_talloc(mem_ctx,
3258 fsp->fsp_name,
3259 &parent_name,
3260 NULL)) {
3261 return NT_STATUS_NO_MEMORY;
3262 }
3263
3264 status = open_directory(fsp->conn,
3265 NULL,
3266 parent_name,
3267 &sbuf,
3268 FILE_READ_ATTRIBUTES, /* Just a stat open */
3269 FILE_SHARE_NONE, /* Ignored for stat opens */
3270 FILE_OPEN,
3271 0,
3272 INTERNAL_OPEN_ONLY,
3273 &info,
3274 &parent_fsp);
3275
3276 if (!NT_STATUS_IS_OK(status)) {
3277 return status;
3278 }
3279
3280 status = SMB_VFS_GET_NT_ACL(parent_fsp->conn, parent_fsp->fsp_name,
3281 DACL_SECURITY_INFORMATION, &parent_sd );
3282
3283 close_file(parent_fsp, NORMAL_CLOSE);
3284
3285 if (!NT_STATUS_IS_OK(status)) {
3286 return status;
3287 }
3288
3289 /*
3290 * Make room for potentially all the ACLs from
3291 * the parent. We used to add the ugw triple here,
3292 * as we knew we were dealing with POSIX ACLs.
3293 * We no longer need to do so as we can guarentee
3294 * that a default ACL from the parent directory will
3295 * be well formed for POSIX ACLs if it came from a
3296 * POSIX ACL source, and if we're not writing to a
3297 * POSIX ACL sink then we don't care if it's not well
3298 * formed. JRA.
3299 */
3300
3301 num_aces += parent_sd->dacl->num_aces;
3302
3303 if((new_ace = TALLOC_ZERO_ARRAY(mem_ctx, SEC_ACE,
3304 num_aces)) == NULL) {
3305 return NT_STATUS_NO_MEMORY;
3306 }
3307
3308 /* Start by copying in all the given ACE entries. */
3309 for (i = 0; i < psd->dacl->num_aces; i++) {
3310 sec_ace_copy(&new_ace[i], &psd->dacl->aces[i]);
3311 }
3312
3313 /*
3314 * Note that we're ignoring "inherit permissions" here
3315 * as that really only applies to newly created files. JRA.
3316 */
3317
3318 /* Finally append any inherited ACEs. */
3319 for (j = 0; j < parent_sd->dacl->num_aces; j++) {
3320 SEC_ACE *se = &parent_sd->dacl->aces[j];
3321
3322 if (fsp->is_directory) {
3323 if (!(se->flags & SEC_ACE_FLAG_CONTAINER_INHERIT)) {
3324 /* Doesn't apply to a directory - ignore. */
3325 DEBUG(10,("append_parent_acl: directory %s "
3326 "ignoring non container "
3327 "inherit flags %u on ACE with sid %s "
3328 "from parent %s\n",
3329 fsp->fsp_name,
3330 (unsigned int)se->flags,
3331 sid_string_dbg(&se->trustee),
3332 parent_name));
3333 continue;
3334 }
3335 } else {
3336 if (!(se->flags & SEC_ACE_FLAG_OBJECT_INHERIT)) {
3337 /* Doesn't apply to a file - ignore. */
3338 DEBUG(10,("append_parent_acl: file %s "
3339 "ignoring non object "
3340 "inherit flags %u on ACE with sid %s "
3341 "from parent %s\n",
3342 fsp->fsp_name,
3343 (unsigned int)se->flags,
3344 sid_string_dbg(&se->trustee),
3345 parent_name));
3346 continue;
3347 }
3348 }
3349
3350 if (is_dacl_protected) {
3351 /* If the DACL is protected it means we must
3352 * not overwrite an existing ACE entry with the
3353 * same SID. This is order N^2. Ouch :-(. JRA. */
3354 unsigned int k;
3355 for (k = 0; k < psd->dacl->num_aces; k++) {
3356 if (sid_equal(&psd->dacl->aces[k].trustee,
3357 &se->trustee)) {
3358 break;
3359 }
3360 }
3361 if (k < psd->dacl->num_aces) {
3362 /* SID matched. Ignore. */
3363 DEBUG(10,("append_parent_acl: path %s "
3364 "ignoring ACE with protected sid %s "
3365 "from parent %s\n",
3366 fsp->fsp_name,
3367 sid_string_dbg(&se->trustee),
3368 parent_name));
3369 continue;
3370 }
3371 }
3372
3373 sec_ace_copy(&new_ace[i], se);
3374 if (se->flags & SEC_ACE_FLAG_NO_PROPAGATE_INHERIT) {
3375 new_ace[i].flags &= ~(SEC_ACE_FLAG_VALID_INHERIT);
3376 }
3377 new_ace[i].flags |= SEC_ACE_FLAG_INHERITED_ACE;
3378
3379 if (fsp->is_directory) {
3380 /*
3381 * Strip off any inherit only. It's applied.
3382 */
3383 new_ace[i].flags &= ~(SEC_ACE_FLAG_INHERIT_ONLY);
3384 if (se->flags & SEC_ACE_FLAG_NO_PROPAGATE_INHERIT) {
3385 /* No further inheritance. */
3386 new_ace[i].flags &=
3387 ~(SEC_ACE_FLAG_CONTAINER_INHERIT|
3388 SEC_ACE_FLAG_OBJECT_INHERIT);
3389 }
3390 } else {
3391 /*
3392 * Strip off any container or inherit
3393 * flags, they can't apply to objects.
3394 */
3395 new_ace[i].flags &= ~(SEC_ACE_FLAG_CONTAINER_INHERIT|
3396 SEC_ACE_FLAG_INHERIT_ONLY|
3397 SEC_ACE_FLAG_NO_PROPAGATE_INHERIT);
3398 }
3399 i++;
3400
3401 DEBUG(10,("append_parent_acl: path %s "
3402 "inheriting ACE with sid %s "
3403 "from parent %s\n",
3404 fsp->fsp_name,
3405 sid_string_dbg(&se->trustee),
3406 parent_name));
3407 }
3408
3409 /* This sucks. psd should be const and we should
3410 * be doing a deep-copy here. We're getting away
3411 * with is as we know parent_sd is talloced off
3412 * talloc_tos() as well as psd. JRA. */
3413
3414 psd->dacl->aces = new_ace;
3415 psd->dacl->num_aces = i;
3416 psd->type &= ~(SE_DESC_DACL_AUTO_INHERITED|
3417 SE_DESC_DACL_AUTO_INHERIT_REQ);
3418
3419 *pp_new_sd = psd;
3420 return status;
3421 }
3422 #endif
3423
3424 /****************************************************************************
3425 Reply to set a security descriptor on an fsp. security_info_sent is the
3426 description of the following NT ACL.
3427 This should be the only external function needed for the UNIX style set ACL.
3428 ****************************************************************************/
3429
3430 NTSTATUS set_nt_acl(files_struct *fsp, uint32 security_info_sent, SEC_DESC *psd)
3431 {
3432 connection_struct *conn = fsp->conn;
3433 uid_t user = (uid_t)-1;
3434 gid_t grp = (gid_t)-1;
3435 SMB_STRUCT_STAT sbuf;
3436 DOM_SID file_owner_sid;
3437 DOM_SID file_grp_sid;
3438 canon_ace *file_ace_list = NULL;
3439 canon_ace *dir_ace_list = NULL;
3440 bool acl_perms = False;
3441 mode_t orig_mode = (mode_t)0;
3442 NTSTATUS status;
3443 bool set_acl_as_root = false;
3444 bool acl_set_support = false;
3445 bool ret = false;
3446
3447 DEBUG(10,("set_nt_acl: called for file %s\n", fsp->fsp_name ));
3448
3449 if (!CAN_WRITE(conn)) {
3450 DEBUG(10,("set acl rejected on read-only share\n"));
3451 return NT_STATUS_MEDIA_WRITE_PROTECTED;
3452 }
3453
3454 /*
3455 * Get the current state of the file.
3456 */
3457
3458 if(fsp->is_directory || fsp->fh->fd == -1) {
3459 if(SMB_VFS_STAT(fsp->conn,fsp->fsp_name, &sbuf) != 0)
3460 return map_nt_error_from_unix(errno);
3461 } else {
3462 if(SMB_VFS_FSTAT(fsp, &sbuf) != 0)
3463 return map_nt_error_from_unix(errno);
3464 }
3465
3466 /* Save the original element we check against. */
3467 orig_mode = sbuf.st_mode;
3468
3469 /*
3470 * Unpack the user/group/world id's.
3471 */
3472
3473 status = unpack_nt_owners( SNUM(conn), &user, &grp, security_info_sent, psd);
3474 if (!NT_STATUS_IS_OK(status)) {
3475 return status;
3476 }
3477
3478 /*
3479 * Do we need to chown ? If so this must be done first as the incoming
3480 * CREATOR_OWNER acl will be relative to the *new* owner, not the old.
3481 * Noticed by Simo.
3482 */
3483
3484 if (((user != (uid_t)-1) && (sbuf.st_uid != user)) || (( grp != (gid_t)-1) && (sbuf.st_gid != grp))) {
3485
3486 DEBUG(3,("set_nt_acl: chown %s. uid = %u, gid = %u.\n",
3487 fsp->fsp_name, (unsigned int)user, (unsigned int)grp ));
3488
3489 if(try_chown( fsp->conn, fsp->fsp_name, user, grp) == -1) {
3490 DEBUG(3,("set_nt_acl: chown %s, %u, %u failed. Error = %s.\n",
3491 fsp->fsp_name, (unsigned int)user, (unsigned int)grp, strerror(errno) ));
3492 if (errno == EPERM) {
3493 return NT_STATUS_INVALID_OWNER;
3494 }
3495 return map_nt_error_from_unix(errno);
3496 }
3497
3498 /*
3499 * Recheck the current state of the file, which may have changed.
3500 * (suid/sgid bits, for instance)
3501 */
3502
3503 if(fsp->is_directory) {
3504 if(SMB_VFS_STAT(fsp->conn, fsp->fsp_name, &sbuf) != 0) {
3505 return map_nt_error_from_unix(errno);
3506 }
3507 } else {
3508
3509 int sret;
3510
3511 if(fsp->fh->fd == -1)
3512 sret = SMB_VFS_STAT(fsp->conn, fsp->fsp_name, &sbuf);
3513 else
3514 sret = SMB_VFS_FSTAT(fsp, &sbuf);
3515
3516 if(sret != 0)
3517 return map_nt_error_from_unix(errno);
3518 }
3519
3520 /* Save the original element we check against. */
3521 orig_mode = sbuf.st_mode;
3522
3523 /* If we successfully chowned, we know we must
3524 * be able to set the acl, so do it as root.
3525 */
3526 set_acl_as_root = true;
3527 }
3528
3529 create_file_sids(&sbuf, &file_owner_sid, &file_grp_sid);
3530
3531 acl_perms = unpack_canon_ace( fsp, &sbuf, &file_owner_sid, &file_grp_sid,
3532 &file_ace_list, &dir_ace_list, security_info_sent, psd);
3533
3534 /* Ignore W2K traverse DACL set. */
3535 if (!file_ace_list && !dir_ace_list) {
3536 return NT_STATUS_OK;
3537 }
3538
3539 if (!acl_perms) {
3540 DEBUG(3,("set_nt_acl: cannot set permissions\n"));
3541 free_canon_ace_list(file_ace_list);
3542 free_canon_ace_list(dir_ace_list);
3543 return NT_STATUS_ACCESS_DENIED;
3544 }
3545
3546 /*
3547 * Only change security if we got a DACL.
3548 */
3549
3550 if(!(security_info_sent & DACL_SECURITY_INFORMATION) || (psd->dacl == NULL)) {
3551 free_canon_ace_list(file_ace_list);
3552 free_canon_ace_list(dir_ace_list);
3553 return NT_STATUS_OK;
3554 }
3555
3556 /*
3557 * Try using the POSIX ACL set first. Fall back to chmod if
3558 * we have no ACL support on this filesystem.
3559 */
3560
3561 if (acl_perms && file_ace_list) {
3562 if (set_acl_as_root) {
3563 become_root();
3564 }
3565 ret = set_canon_ace_list(fsp, file_ace_list, False, sbuf.st_gid, &acl_set_support);
3566 if (set_acl_as_root) {
3567 unbecome_root();
3568 }
3569 if (acl_set_support && ret == false) {
3570 DEBUG(3,("set_nt_acl: failed to set file acl on file %s (%s).\n", fsp->fsp_name, strerror(errno) ));
3571 free_canon_ace_list(file_ace_list);
3572 free_canon_ace_list(dir_ace_list);
3573 return map_nt_error_from_unix(errno);
3574 }
3575 }
3576
3577 if (acl_perms && acl_set_support && fsp->is_directory) {
3578 if (dir_ace_list) {
3579 if (set_acl_as_root) {
3580 become_root();
3581 }
3582 ret = set_canon_ace_list(fsp, dir_ace_list, True, sbuf.st_gid, &acl_set_support);
3583 if (set_acl_as_root) {
3584 unbecome_root();
3585 }
3586 if (ret == false) {
3587 DEBUG(3,("set_nt_acl: failed to set default acl on directory %s (%s).\n", fsp->fsp_name, strerror(errno) ));
3588 free_canon_ace_list(file_ace_list);
3589 free_canon_ace_list(dir_ace_list);
3590 return map_nt_error_from_unix(errno);
3591 }
3592 } else {
3593 int sret = -1;
3594
3595 /*
3596 * No default ACL - delete one if it exists.
3597 */
3598
3599 if (set_acl_as_root) {
3600 become_root();
3601 }
3602 sret = SMB_VFS_SYS_ACL_DELETE_DEF_FILE(conn, fsp->fsp_name);
3603 if (set_acl_as_root) {
3604 unbecome_root();
3605 }
3606 if (sret == -1) {
3607 if (acl_group_override(conn, sbuf.st_gid, fsp->fsp_name)) {
3608 DEBUG(5,("set_nt_acl: acl group control on and "
3609 "current user in file %s primary group. Override delete_def_acl\n",
3610 fsp->fsp_name ));
3611
3612 become_root();
3613 sret = SMB_VFS_SYS_ACL_DELETE_DEF_FILE(conn, fsp->fsp_name);
3614 unbecome_root();
3615 }
3616
3617 if (sret == -1) {
3618 DEBUG(3,("set_nt_acl: sys_acl_delete_def_file failed (%s)\n", strerror(errno)));
3619 free_canon_ace_list(file_ace_list);
3620 free_canon_ace_list(dir_ace_list);
3621 return map_nt_error_from_unix(errno);
3622 }
3623 }
3624 }
3625 }
3626
3627 if (acl_set_support) {
3628 if (set_acl_as_root) {
3629 become_root();
3630 }
3631 store_inheritance_attributes(fsp, file_ace_list, dir_ace_list,
3632 (psd->type & SE_DESC_DACL_PROTECTED) ? True : False);
3633 if (set_acl_as_root) {
3634 unbecome_root();
3635 }
3636 }
3637
3638 /*
3639 * If we cannot set using POSIX ACLs we fall back to checking if we need to chmod.
3640 */
3641
3642 if(!acl_set_support && acl_perms) {
3643 mode_t posix_perms;
3644
3645 if (!convert_canon_ace_to_posix_perms( fsp, file_ace_list, &posix_perms)) {
3646 free_canon_ace_list(file_ace_list);
3647 free_canon_ace_list(dir_ace_list);
3648 DEBUG(3,("set_nt_acl: failed to convert file acl to posix permissions for file %s.\n",
3649 fsp->fsp_name ));
3650 return NT_STATUS_ACCESS_DENIED;
3651 }
3652
3653 if (orig_mode != posix_perms) {
3654 int sret = -1;
3655
3656 DEBUG(3,("set_nt_acl: chmod %s. perms = 0%o.\n",
3657 fsp->fsp_name, (unsigned int)posix_perms ));
3658
3659 if (set_acl_as_root) {
3660 become_root();
3661 }
3662 sret = SMB_VFS_CHMOD(conn,fsp->fsp_name, posix_perms);
3663 if (set_acl_as_root) {
3664 unbecome_root();
3665 }
3666 if(sret == -1) {
3667 if (acl_group_override(conn, sbuf.st_gid, fsp->fsp_name)) {
3668 DEBUG(5,("set_nt_acl: acl group control on and "
3669 "current user in file %s primary group. Override chmod\n",
3670 fsp->fsp_name ));
3671
3672 become_root();
3673 sret = SMB_VFS_CHMOD(conn,fsp->fsp_name, posix_perms);
3674 unbecome_root();
3675 }
3676
3677 if (sret == -1) {
3678 DEBUG(3,("set_nt_acl: chmod %s, 0%o failed. Error = %s.\n",
3679 fsp->fsp_name, (unsigned int)posix_perms, strerror(errno) ));
3680 free_canon_ace_list(file_ace_list);
3681 free_canon_ace_list(dir_ace_list);
3682 return map_nt_error_from_unix(errno);
3683 }
3684 }
3685 }
3686 }
3687
3688 free_canon_ace_list(file_ace_list);
3689 free_canon_ace_list(dir_ace_list);
3690 return NT_STATUS_OK;
3691 }
3692
3693 /****************************************************************************
3694 Get the actual group bits stored on a file with an ACL. Has no effect if
3695 the file has no ACL. Needed in dosmode code where the stat() will return
3696 the mask bits, not the real group bits, for a file with an ACL.
3697 ****************************************************************************/
3698
3699 int get_acl_group_bits( connection_struct *conn, const char *fname, mode_t *mode )
3700 {
3701 int entry_id = SMB_ACL_FIRST_ENTRY;
3702 SMB_ACL_ENTRY_T entry;
3703 SMB_ACL_T posix_acl;
3704 int result = -1;
3705
3706 posix_acl = SMB_VFS_SYS_ACL_GET_FILE(conn, fname, SMB_ACL_TYPE_ACCESS);
3707 if (posix_acl == (SMB_ACL_T)NULL)
3708 return -1;
3709
3710 while (SMB_VFS_SYS_ACL_GET_ENTRY(conn, posix_acl, entry_id, &entry) == 1) {
3711 SMB_ACL_TAG_T tagtype;
3712 SMB_ACL_PERMSET_T permset;
3713
3714 /* get_next... */
3715 if (entry_id == SMB_ACL_FIRST_ENTRY)
3716 entry_id = SMB_ACL_NEXT_ENTRY;
3717
3718 if (SMB_VFS_SYS_ACL_GET_TAG_TYPE(conn, entry, &tagtype) ==-1)
3719 break;
3720
3721 if (tagtype == SMB_ACL_GROUP_OBJ) {
3722 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, entry, &permset) == -1) {
3723 break;
3724 } else {
3725 *mode &= ~(S_IRGRP|S_IWGRP|S_IXGRP);
3726 *mode |= (SMB_VFS_SYS_ACL_GET_PERM(conn, permset, SMB_ACL_READ) ? S_IRGRP : 0);
3727 *mode |= (SMB_VFS_SYS_ACL_GET_PERM(conn, permset, SMB_ACL_WRITE) ? S_IWGRP : 0);
3728 *mode |= (SMB_VFS_SYS_ACL_GET_PERM(conn, permset, SMB_ACL_EXECUTE) ? S_IXGRP : 0);
3729 result = 0;
3730 break;
3731 }
3732 }
3733 }
3734 SMB_VFS_SYS_ACL_FREE_ACL(conn, posix_acl);
3735 return result;
3736 }
3737
3738 /****************************************************************************
3739 Do a chmod by setting the ACL USER_OBJ, GROUP_OBJ and OTHER bits in an ACL
3740 and set the mask to rwx. Needed to preserve complex ACLs set by NT.
3741 ****************************************************************************/
3742
3743 static int chmod_acl_internals( connection_struct *conn, SMB_ACL_T posix_acl, mode_t mode)
3744 {
3745 int entry_id = SMB_ACL_FIRST_ENTRY;
3746 SMB_ACL_ENTRY_T entry;
3747 int num_entries = 0;
3748
3749 while ( SMB_VFS_SYS_ACL_GET_ENTRY(conn, posix_acl, entry_id, &entry) == 1) {
3750 SMB_ACL_TAG_T tagtype;
3751 SMB_ACL_PERMSET_T permset;
3752 mode_t perms;
3753
3754 /* get_next... */
3755 if (entry_id == SMB_ACL_FIRST_ENTRY)
3756 entry_id = SMB_ACL_NEXT_ENTRY;
3757
3758 if (SMB_VFS_SYS_ACL_GET_TAG_TYPE(conn, entry, &tagtype) == -1)
3759 return -1;
3760
3761 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, entry, &permset) == -1)
3762 return -1;
3763
3764 num_entries++;
3765
3766 switch(tagtype) {
3767 case SMB_ACL_USER_OBJ:
3768 perms = unix_perms_to_acl_perms(mode, S_IRUSR, S_IWUSR, S_IXUSR);
3769 break;
3770 case SMB_ACL_GROUP_OBJ:
3771 perms = unix_perms_to_acl_perms(mode, S_IRGRP, S_IWGRP, S_IXGRP);
3772 break;
3773 case SMB_ACL_MASK:
3774 /*
3775 * FIXME: The ACL_MASK entry permissions should really be set to
3776 * the union of the permissions of all ACL_USER,
3777 * ACL_GROUP_OBJ, and ACL_GROUP entries. That's what
3778 * acl_calc_mask() does, but Samba ACLs doesn't provide it.
3779 */
3780 perms = S_IRUSR|S_IWUSR|S_IXUSR;
3781 break;
3782 case SMB_ACL_OTHER:
3783 perms = unix_perms_to_acl_perms(mode, S_IROTH, S_IWOTH, S_IXOTH);
3784 break;
3785 default:
3786 continue;
3787 }
3788
3789 if (map_acl_perms_to_permset(conn, perms, &permset) == -1)
3790 return -1;
3791
3792 if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, entry, permset) == -1)
3793 return -1;
3794 }
3795
3796 /*
3797 * If this is a simple 3 element ACL or no elements then it's a standard
3798 * UNIX permission set. Just use chmod...
3799 */
3800
3801 if ((num_entries == 3) || (num_entries == 0))
3802 return -1;
3803
3804 return 0;
3805 }
3806
3807 /****************************************************************************
3808 Get the access ACL of FROM, do a chmod by setting the ACL USER_OBJ,
3809 GROUP_OBJ and OTHER bits in an ACL and set the mask to rwx. Set the
3810 resulting ACL on TO. Note that name is in UNIX character set.
3811 ****************************************************************************/
3812
3813 static int copy_access_acl(connection_struct *conn, const char *from, const char *to, mode_t mode)
3814 {
3815 SMB_ACL_T posix_acl = NULL;
3816 int ret = -1;
3817
3818 if ((posix_acl = SMB_VFS_SYS_ACL_GET_FILE(conn, from, SMB_ACL_TYPE_ACCESS)) == NULL)
3819 return -1;
3820
3821 if ((ret = chmod_acl_internals(conn, posix_acl, mode)) == -1)
3822 goto done;
3823
3824 ret = SMB_VFS_SYS_ACL_SET_FILE(conn, to, SMB_ACL_TYPE_ACCESS, posix_acl);
3825
3826 done:
3827
3828 SMB_VFS_SYS_ACL_FREE_ACL(conn, posix_acl);
3829 return ret;
3830 }
3831
3832 /****************************************************************************
3833 Do a chmod by setting the ACL USER_OBJ, GROUP_OBJ and OTHER bits in an ACL
3834 and set the mask to rwx. Needed to preserve complex ACLs set by NT.
3835 Note that name is in UNIX character set.
3836 ****************************************************************************/
3837
3838 int chmod_acl(connection_struct *conn, const char *name, mode_t mode)
3839 {
3840 return copy_access_acl(conn, name, name, mode);
3841 }
3842
3843 /****************************************************************************
3844 If the parent directory has no default ACL but it does have an Access ACL,
3845 inherit this Access ACL to file name.
3846 ****************************************************************************/
3847
3848 int inherit_access_acl(connection_struct *conn, const char *inherit_from_dir,
3849 const char *name, mode_t mode)
3850 {
3851 if (directory_has_default_acl(conn, inherit_from_dir))
3852 return 0;
3853
3854 return copy_access_acl(conn, inherit_from_dir, name, mode);
3855 }
3856
3857 /****************************************************************************
3858 Do an fchmod by setting the ACL USER_OBJ, GROUP_OBJ and OTHER bits in an ACL
3859 and set the mask to rwx. Needed to preserve complex ACLs set by NT.
3860 ****************************************************************************/
3861
3862 int fchmod_acl(files_struct *fsp, mode_t mode)
3863 {
3864 connection_struct *conn = fsp->conn;
3865 SMB_ACL_T posix_acl = NULL;
3866 int ret = -1;
3867
3868 if ((posix_acl = SMB_VFS_SYS_ACL_GET_FD(fsp)) == NULL)
3869 return -1;
3870
3871 if ((ret = chmod_acl_internals(conn, posix_acl, mode)) == -1)
3872 goto done;
3873
3874 ret = SMB_VFS_SYS_ACL_SET_FD(fsp, posix_acl);
3875
3876 done:
3877
3878 SMB_VFS_SYS_ACL_FREE_ACL(conn, posix_acl);
3879 return ret;
3880 }
3881
3882 /****************************************************************************
3883 Check for an existing default POSIX ACL on a directory.
3884 ****************************************************************************/
3885
3886 bool directory_has_default_acl(connection_struct *conn, const char *fname)
3887 {
3888 SMB_ACL_T def_acl = SMB_VFS_SYS_ACL_GET_FILE( conn, fname, SMB_ACL_TYPE_DEFAULT);
3889 bool has_acl = False;
3890 SMB_ACL_ENTRY_T entry;
3891
3892 if (def_acl != NULL && (SMB_VFS_SYS_ACL_GET_ENTRY(conn, def_acl, SMB_ACL_FIRST_ENTRY, &entry) == 1)) {
3893 has_acl = True;
3894 }
3895
3896 if (def_acl) {
3897 SMB_VFS_SYS_ACL_FREE_ACL(conn, def_acl);
3898 }
3899 return has_acl;
3900 }
3901
3902 /****************************************************************************
3903 Map from wire type to permset.
3904 ****************************************************************************/
3905
3906 static bool unix_ex_wire_to_permset(connection_struct *conn, unsigned char wire_perm, SMB_ACL_PERMSET_T *p_permset)
3907 {
3908 if (wire_perm & ~(SMB_POSIX_ACL_READ|SMB_POSIX_ACL_WRITE|SMB_POSIX_ACL_EXECUTE)) {
3909 return False;
3910 }
3911
3912 if (SMB_VFS_SYS_ACL_CLEAR_PERMS(conn, *p_permset) == -1) {
3913 return False;
3914 }
3915
3916 if (wire_perm & SMB_POSIX_ACL_READ) {
3917 if (SMB_VFS_SYS_ACL_ADD_PERM(conn, *p_permset, SMB_ACL_READ) == -1) {
3918 return False;
3919 }
3920 }
3921 if (wire_perm & SMB_POSIX_ACL_WRITE) {
3922 if (SMB_VFS_SYS_ACL_ADD_PERM(conn, *p_permset, SMB_ACL_WRITE) == -1) {
3923 return False;
3924 }
3925 }
3926 if (wire_perm & SMB_POSIX_ACL_EXECUTE) {
3927 if (SMB_VFS_SYS_ACL_ADD_PERM(conn, *p_permset, SMB_ACL_EXECUTE) == -1) {
3928 return False;
3929 }
3930 }
3931 return True;
3932 }
3933
3934 /****************************************************************************
3935 Map from wire type to tagtype.
3936 ****************************************************************************/
3937
3938 static bool unix_ex_wire_to_tagtype(unsigned char wire_tt, SMB_ACL_TAG_T *p_tt)
3939 {
3940 switch (wire_tt) {
3941 case SMB_POSIX_ACL_USER_OBJ:
3942 *p_tt = SMB_ACL_USER_OBJ;
3943 break;
3944 case SMB_POSIX_ACL_USER:
3945 *p_tt = SMB_ACL_USER;
3946 break;
3947 case SMB_POSIX_ACL_GROUP_OBJ:
3948 *p_tt = SMB_ACL_GROUP_OBJ;
3949 break;
3950 case SMB_POSIX_ACL_GROUP:
3951 *p_tt = SMB_ACL_GROUP;
3952 break;
3953 case SMB_POSIX_ACL_MASK:
3954 *p_tt = SMB_ACL_MASK;
3955 break;
3956 case SMB_POSIX_ACL_OTHER:
3957 *p_tt = SMB_ACL_OTHER;
3958 break;
3959 default:
3960 return False;
3961 }
3962 return True;
3963 }
3964
3965 /****************************************************************************
3966 Create a new POSIX acl from wire permissions.
3967 FIXME ! How does the share mask/mode fit into this.... ?
3968 ****************************************************************************/
3969
3970 static SMB_ACL_T create_posix_acl_from_wire(connection_struct *conn, uint16 num_acls, const char *pdata)
3971 {
3972 unsigned int i;
3973 SMB_ACL_T the_acl = SMB_VFS_SYS_ACL_INIT(conn, num_acls);
3974
3975 if (the_acl == NULL) {
3976 return NULL;
3977 }
3978
3979 for (i = 0; i < num_acls; i++) {
3980 SMB_ACL_ENTRY_T the_entry;
3981 SMB_ACL_PERMSET_T the_permset;
3982 SMB_ACL_TAG_T tag_type;
3983
3984 if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &the_acl, &the_entry) == -1) {
3985 DEBUG(0,("create_posix_acl_from_wire: Failed to create entry %u. (%s)\n",
3986 i, strerror(errno) ));
3987 goto fail;
3988 }
3989
3990 if (!unix_ex_wire_to_tagtype(CVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)), &tag_type)) {
3991 DEBUG(0,("create_posix_acl_from_wire: invalid wire tagtype %u on entry %u.\n",
3992 CVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)), i ));
3993 goto fail;
3994 }
3995
3996 if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, the_entry, tag_type) == -1) {
3997 DEBUG(0,("create_posix_acl_from_wire: Failed to set tagtype on entry %u. (%s)\n",
3998 i, strerror(errno) ));
3999 goto fail;
4000 }
4001
4002 /* Get the permset pointer from the new ACL entry. */
4003 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, the_entry, &the_permset) == -1) {
4004 DEBUG(0,("create_posix_acl_from_wire: Failed to get permset on entry %u. (%s)\n",
4005 i, strerror(errno) ));
4006 goto fail;
4007 }
4008
4009 /* Map from wire to permissions. */
4010 if (!unix_ex_wire_to_permset(conn, CVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)+1), &the_permset)) {
4011 DEBUG(0,("create_posix_acl_from_wire: invalid permset %u on entry %u.\n",
4012 CVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE) + 1), i ));
4013 goto fail;
4014 }
4015
4016 /* Now apply to the new ACL entry. */
4017 if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, the_entry, the_permset) == -1) {
4018 DEBUG(0,("create_posix_acl_from_wire: Failed to add permset on entry %u. (%s)\n",
4019 i, strerror(errno) ));
4020 goto fail;
4021 }
4022
4023 if (tag_type == SMB_ACL_USER) {
4024 uint32 uidval = IVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)+2);
4025 uid_t uid = (uid_t)uidval;
4026 if (SMB_VFS_SYS_ACL_SET_QUALIFIER(conn, the_entry,(void *)&uid) == -1) {
4027 DEBUG(0,("create_posix_acl_from_wire: Failed to set uid %u on entry %u. (%s)\n",
4028 (unsigned int)uid, i, strerror(errno) ));
4029 goto fail;
4030 }
4031 }
4032
4033 if (tag_type == SMB_ACL_GROUP) {
4034 uint32 gidval = IVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)+2);
4035 gid_t gid = (uid_t)gidval;
4036 if (SMB_VFS_SYS_ACL_SET_QUALIFIER(conn, the_entry,(void *)&gid) == -1) {
4037 DEBUG(0,("create_posix_acl_from_wire: Failed to set gid %u on entry %u. (%s)\n",
4038 (unsigned int)gid, i, strerror(errno) ));
4039 goto fail;
4040 }
4041 }
4042 }
4043
4044 return the_acl;
4045
4046 fail:
4047
4048 if (the_acl != NULL) {
4049 SMB_VFS_SYS_ACL_FREE_ACL(conn, the_acl);
4050 }
4051 return NULL;
4052 }
4053
4054 /****************************************************************************
4055 Calls from UNIX extensions - Default POSIX ACL set.
4056 If num_def_acls == 0 and not a directory just return. If it is a directory
4057 and num_def_acls == 0 then remove the default acl. Else set the default acl
4058 on the directory.
4059 ****************************************************************************/
4060
4061 bool set_unix_posix_default_acl(connection_struct *conn, const char *fname, SMB_STRUCT_STAT *psbuf,
4062 uint16 num_def_acls, const char *pdata)
4063 {
4064 SMB_ACL_T def_acl = NULL;
4065
4066 if (!S_ISDIR(psbuf->st_mode)) {
4067 if (num_def_acls) {
4068 DEBUG(5,("set_unix_posix_default_acl: Can't set default ACL on non-directory file %s\n", fname ));
4069 errno = EISDIR;
4070 return False;
4071 } else {
4072 return True;
4073 }
4074 }
4075
4076 if (!num_def_acls) {
4077 /* Remove the default ACL. */
4078 if (SMB_VFS_SYS_ACL_DELETE_DEF_FILE(conn, fname) == -1) {
4079 DEBUG(5,("set_unix_posix_default_acl: acl_delete_def_file failed on directory %s (%s)\n",
4080 fname, strerror(errno) ));
4081 return False;
4082 }
4083 return True;
4084 }
4085
4086 if ((def_acl = create_posix_acl_from_wire(conn, num_def_acls, pdata)) == NULL) {
4087 return False;
4088 }
4089
4090 if (SMB_VFS_SYS_ACL_SET_FILE(conn, fname, SMB_ACL_TYPE_DEFAULT, def_acl) == -1) {
4091 DEBUG(5,("set_unix_posix_default_acl: acl_set_file failed on directory %s (%s)\n",
4092 fname, strerror(errno) ));
4093 SMB_VFS_SYS_ACL_FREE_ACL(conn, def_acl);
4094 return False;
4095 }
4096
4097 DEBUG(10,("set_unix_posix_default_acl: set default acl for file %s\n", fname ));
4098 SMB_VFS_SYS_ACL_FREE_ACL(conn, def_acl);
4099 return True;
4100 }
4101
4102 /****************************************************************************
4103 Remove an ACL from a file. As we don't have acl_delete_entry() available
4104 we must read the current acl and copy all entries except MASK, USER and GROUP
4105 to a new acl, then set that. This (at least on Linux) causes any ACL to be
4106 removed.
4107 FIXME ! How does the share mask/mode fit into this.... ?
4108 ****************************************************************************/
4109
4110 static bool remove_posix_acl(connection_struct *conn, files_struct *fsp, const char *fname)
4111 {
4112 SMB_ACL_T file_acl = NULL;
4113 int entry_id = SMB_ACL_FIRST_ENTRY;
4114 SMB_ACL_ENTRY_T entry;
4115 bool ret = False;
4116 /* Create a new ACL with only 3 entries, u/g/w. */
4117 SMB_ACL_T new_file_acl = SMB_VFS_SYS_ACL_INIT(conn, 3);
4118 SMB_ACL_ENTRY_T user_ent = NULL;
4119 SMB_ACL_ENTRY_T group_ent = NULL;
4120 SMB_ACL_ENTRY_T other_ent = NULL;
4121
4122 if (new_file_acl == NULL) {
4123 DEBUG(5,("remove_posix_acl: failed to init new ACL with 3 entries for file %s.\n", fname));
4124 return False;
4125 }
4126
4127 /* Now create the u/g/w entries. */
4128 if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &new_file_acl, &user_ent) == -1) {
4129 DEBUG(5,("remove_posix_acl: Failed to create user entry for file %s. (%s)\n",
4130 fname, strerror(errno) ));
4131 goto done;
4132 }
4133 if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, user_ent, SMB_ACL_USER_OBJ) == -1) {
4134 DEBUG(5,("remove_posix_acl: Failed to set user entry for file %s. (%s)\n",
4135 fname, strerror(errno) ));
4136 goto done;
4137 }
4138
4139 if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &new_file_acl, &group_ent) == -1) {
4140 DEBUG(5,("remove_posix_acl: Failed to create group entry for file %s. (%s)\n",
4141 fname, strerror(errno) ));
4142 goto done;
4143 }
4144 if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, group_ent, SMB_ACL_GROUP_OBJ) == -1) {
4145 DEBUG(5,("remove_posix_acl: Failed to set group entry for file %s. (%s)\n",
4146 fname, strerror(errno) ));
4147 goto done;
4148 }
4149
4150 if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &new_file_acl, &other_ent) == -1) {
4151 DEBUG(5,("remove_posix_acl: Failed to create other entry for file %s. (%s)\n",
4152 fname, strerror(errno) ));
4153 goto done;
4154 }
4155 if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, other_ent, SMB_ACL_OTHER) == -1) {
4156 DEBUG(5,("remove_posix_acl: Failed to set other entry for file %s. (%s)\n",
4157 fname, strerror(errno) ));
4158 goto done;
4159 }
4160
4161 /* Get the current file ACL. */
4162 if (fsp && fsp->fh->fd != -1) {
4163 file_acl = SMB_VFS_SYS_ACL_GET_FD(fsp);
4164 } else {
4165 file_acl = SMB_VFS_SYS_ACL_GET_FILE( conn, fname, SMB_ACL_TYPE_ACCESS);
4166 }
4167
4168 if (file_acl == NULL) {
4169 /* This is only returned if an error occurred. Even for a file with
4170 no acl a u/g/w acl should be returned. */
4171 DEBUG(5,("remove_posix_acl: failed to get ACL from file %s (%s).\n",
4172 fname, strerror(errno) ));
4173 goto done;
4174 }
4175
4176 while ( SMB_VFS_SYS_ACL_GET_ENTRY(conn, file_acl, entry_id, &entry) == 1) {
4177 SMB_ACL_TAG_T tagtype;
4178 SMB_ACL_PERMSET_T permset;
4179
4180 /* get_next... */
4181 if (entry_id == SMB_ACL_FIRST_ENTRY)
4182 entry_id = SMB_ACL_NEXT_ENTRY;
4183
4184 if (SMB_VFS_SYS_ACL_GET_TAG_TYPE(conn, entry, &tagtype) == -1) {
4185 DEBUG(5,("remove_posix_acl: failed to get tagtype from ACL on file %s (%s).\n",
4186 fname, strerror(errno) ));
4187 goto done;
4188 }
4189
4190 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, entry, &permset) == -1) {
4191 DEBUG(5,("remove_posix_acl: failed to get permset from ACL on file %s (%s).\n",
4192 fname, strerror(errno) ));
4193 goto done;
4194 }
4195
4196 if (tagtype == SMB_ACL_USER_OBJ) {
4197 if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, user_ent, permset) == -1) {
4198 DEBUG(5,("remove_posix_acl: failed to set permset from ACL on file %s (%s).\n",
4199 fname, strerror(errno) ));
4200 }
4201 } else if (tagtype == SMB_ACL_GROUP_OBJ) {
4202 if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, group_ent, permset) == -1) {
4203 DEBUG(5,("remove_posix_acl: failed to set permset from ACL on file %s (%s).\n",
4204 fname, strerror(errno) ));
4205 }
4206 } else if (tagtype == SMB_ACL_OTHER) {
4207 if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, other_ent, permset) == -1) {
4208 DEBUG(5,("remove_posix_acl: failed to set permset from ACL on file %s (%s).\n",
4209 fname, strerror(errno) ));
4210 }
4211 }
4212 }
4213
4214 /* Set the new empty file ACL. */
4215 if (fsp && fsp->fh->fd != -1) {
4216 if (SMB_VFS_SYS_ACL_SET_FD(fsp, new_file_acl) == -1) {
4217 DEBUG(5,("remove_posix_acl: acl_set_file failed on %s (%s)\n",
4218 fname, strerror(errno) ));
4219 goto done;
4220 }
4221 } else {
4222 if (SMB_VFS_SYS_ACL_SET_FILE(conn, fname, SMB_ACL_TYPE_ACCESS, new_file_acl) == -1) {
4223 DEBUG(5,("remove_posix_acl: acl_set_file failed on %s (%s)\n",
4224 fname, strerror(errno) ));
4225 goto done;
4226 }
4227 }
4228
4229 ret = True;
4230
4231 done:
4232
4233 if (file_acl) {
4234 SMB_VFS_SYS_ACL_FREE_ACL(conn, file_acl);
4235 }
4236 if (new_file_acl) {
4237 SMB_VFS_SYS_ACL_FREE_ACL(conn, new_file_acl);
4238 }
4239 return ret;
4240 }
4241
4242 /****************************************************************************
4243 Calls from UNIX extensions - POSIX ACL set.
4244 If num_def_acls == 0 then read/modify/write acl after removing all entries
4245 except SMB_ACL_USER_OBJ, SMB_ACL_GROUP_OBJ, SMB_ACL_OTHER.
4246 ****************************************************************************/
4247
4248 bool set_unix_posix_acl(connection_struct *conn, files_struct *fsp, const char *fname, uint16 num_acls, const char *pdata)
4249 {
4250 SMB_ACL_T file_acl = NULL;
4251
4252 if (!num_acls) {
4253 /* Remove the ACL from the file. */
4254 return remove_posix_acl(conn, fsp, fname);
4255 }
4256
4257 if ((file_acl = create_posix_acl_from_wire(conn, num_acls, pdata)) == NULL) {
4258 return False;
4259 }
4260
4261 if (fsp && fsp->fh->fd != -1) {
4262 /* The preferred way - use an open fd. */
4263 if (SMB_VFS_SYS_ACL_SET_FD(fsp, file_acl) == -1) {
4264 DEBUG(5,("set_unix_posix_acl: acl_set_file failed on %s (%s)\n",
4265 fname, strerror(errno) ));
4266 SMB_VFS_SYS_ACL_FREE_ACL(conn, file_acl);
4267 return False;
4268 }
4269 } else {
4270 if (SMB_VFS_SYS_ACL_SET_FILE(conn, fname, SMB_ACL_TYPE_ACCESS, file_acl) == -1) {
4271 DEBUG(5,("set_unix_posix_acl: acl_set_file failed on %s (%s)\n",
4272 fname, strerror(errno) ));
4273 SMB_VFS_SYS_ACL_FREE_ACL(conn, file_acl);
4274 return False;
4275 }
4276 }
4277
4278 DEBUG(10,("set_unix_posix_acl: set acl for file %s\n", fname ));
4279 SMB_VFS_SYS_ACL_FREE_ACL(conn, file_acl);
4280 return True;
4281 }
4282
4283 /********************************************************************
4284 Pull the NT ACL from a file on disk or the OpenEventlog() access
4285 check. Caller is responsible for freeing the returned security
4286 descriptor via TALLOC_FREE(). This is designed for dealing with
4287 user space access checks in smbd outside of the VFS. For example,
4288 checking access rights in OpenEventlog().
4289
4290 Assume we are dealing with files (for now)
4291 ********************************************************************/
4292
4293 SEC_DESC *get_nt_acl_no_snum( TALLOC_CTX *ctx, const char *fname)
4294 {
4295 SEC_DESC *psd, *ret_sd;
4296 connection_struct conn;
4297 files_struct finfo;
4298 struct fd_handle fh;
4299
4300 ZERO_STRUCT( conn );
4301
4302 if ( !(conn.mem_ctx = talloc_init( "novfs_get_nt_acl" )) ) {
4303 DEBUG(0,("get_nt_acl_no_snum: talloc() failed!\n"));
4304 return NULL;
4305 }
4306
4307 if (!(conn.params = TALLOC_P(conn.mem_ctx, struct share_params))) {
4308 DEBUG(0,("get_nt_acl_no_snum: talloc() failed!\n"));
4309 TALLOC_FREE(conn.mem_ctx);
4310 return NULL;
4311 }
4312
4313 conn.params->service = -1;
4314
4315 set_conn_connectpath(&conn, "/");
4316
4317 if (!smbd_vfs_init(&conn)) {
4318 DEBUG(0,("get_nt_acl_no_snum: Unable to create a fake connection struct!\n"));
4319 conn_free_internal( &conn );
4320 return NULL;
4321 }
4322
4323 ZERO_STRUCT( finfo );
4324 ZERO_STRUCT( fh );
4325
4326 finfo.fnum = -1;
4327 finfo.conn = &conn;
4328 finfo.fh = &fh;
4329 finfo.fh->fd = -1;
4330 finfo.fsp_name = CONST_DISCARD(char *,fname);
4331
4332 if (!NT_STATUS_IS_OK(posix_fget_nt_acl( &finfo, DACL_SECURITY_INFORMATION, &psd))) {
4333 DEBUG(0,("get_nt_acl_no_snum: get_nt_acl returned zero.\n"));
4334 conn_free_internal( &conn );
4335 return NULL;
4336 }
4337
4338 ret_sd = dup_sec_desc( ctx, psd );
4339
4340 conn_free_internal( &conn );
4341
4342 return ret_sd;
4343 }
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