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r14207: Convert the lp_acl_compatibility() param into an enum.
[Samba/nascimento.git] / source3 / smbd / posix_acls.c
blob5356d962a23646caa3d52c8ee652517aca482bad
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 2 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, write to the Free Software
19 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
20 */
21
22 #include "includes.h"
23
24 extern struct current_user current_user;
25 extern struct generic_mapping file_generic_mapping;
26
27 #undef DBGC_CLASS
28 #define DBGC_CLASS DBGC_ACLS
29
30 /****************************************************************************
31 Data structures representing the internal ACE format.
32 ****************************************************************************/
33
34 enum ace_owner {UID_ACE, GID_ACE, WORLD_ACE};
35 enum ace_attribute {ALLOW_ACE, DENY_ACE}; /* Used for incoming NT ACLS. */
36
37 typedef union posix_id {
38 uid_t uid;
39 gid_t gid;
40 int world;
41 } posix_id;
42
43 typedef struct canon_ace {
44 struct canon_ace *next, *prev;
45 SMB_ACL_TAG_T type;
46 mode_t perms; /* Only use S_I(R|W|X)USR mode bits here. */
47 DOM_SID trustee;
48 enum ace_owner owner_type;
49 enum ace_attribute attr;
50 posix_id unix_ug;
51 BOOL inherited;
52 } canon_ace;
53
54 #define ALL_ACE_PERMS (S_IRUSR|S_IWUSR|S_IXUSR)
55
56 /*
57 * EA format of user.SAMBA_PAI (Samba_Posix_Acl_Interitance)
58 * attribute on disk.
59 *
60 * | 1 | 1 | 2 | 2 | ....
61 * +------+------+-------------+---------------------+-------------+--------------------+
62 * | vers | flag | num_entries | num_default_entries | ..entries.. | default_entries... |
63 * +------+------+-------------+---------------------+-------------+--------------------+
64 */
65
66 #define PAI_VERSION_OFFSET 0
67 #define PAI_FLAG_OFFSET 1
68 #define PAI_NUM_ENTRIES_OFFSET 2
69 #define PAI_NUM_DEFAULT_ENTRIES_OFFSET 4
70 #define PAI_ENTRIES_BASE 6
71
72 #define PAI_VERSION 1
73 #define PAI_ACL_FLAG_PROTECTED 0x1
74 #define PAI_ENTRY_LENGTH 5
75
76 /*
77 * In memory format of user.SAMBA_PAI attribute.
78 */
79
80 struct pai_entry {
81 struct pai_entry *next, *prev;
82 enum ace_owner owner_type;
83 posix_id unix_ug;
84 };
85
86 struct pai_val {
87 BOOL pai_protected;
88 unsigned int num_entries;
89 struct pai_entry *entry_list;
90 unsigned int num_def_entries;
91 struct pai_entry *def_entry_list;
92 };
93
94 /************************************************************************
95 Return a uint32 of the pai_entry principal.
96 ************************************************************************/
97
98 static uint32 get_pai_entry_val(struct pai_entry *paie)
99 {
100 switch (paie->owner_type) {
101 case UID_ACE:
102 DEBUG(10,("get_pai_entry_val: uid = %u\n", (unsigned int)paie->unix_ug.uid ));
103 return (uint32)paie->unix_ug.uid;
104 case GID_ACE:
105 DEBUG(10,("get_pai_entry_val: gid = %u\n", (unsigned int)paie->unix_ug.gid ));
106 return (uint32)paie->unix_ug.gid;
107 case WORLD_ACE:
108 default:
109 DEBUG(10,("get_pai_entry_val: world ace\n"));
110 return (uint32)-1;
111 }
112 }
113
114 /************************************************************************
115 Return a uint32 of the entry principal.
116 ************************************************************************/
117
118 static uint32 get_entry_val(canon_ace *ace_entry)
119 {
120 switch (ace_entry->owner_type) {
121 case UID_ACE:
122 DEBUG(10,("get_entry_val: uid = %u\n", (unsigned int)ace_entry->unix_ug.uid ));
123 return (uint32)ace_entry->unix_ug.uid;
124 case GID_ACE:
125 DEBUG(10,("get_entry_val: gid = %u\n", (unsigned int)ace_entry->unix_ug.gid ));
126 return (uint32)ace_entry->unix_ug.gid;
127 case WORLD_ACE:
128 default:
129 DEBUG(10,("get_entry_val: world ace\n"));
130 return (uint32)-1;
131 }
132 }
133
134 /************************************************************************
135 Count the inherited entries.
136 ************************************************************************/
137
138 static unsigned int num_inherited_entries(canon_ace *ace_list)
139 {
140 unsigned int num_entries = 0;
141
142 for (; ace_list; ace_list = ace_list->next)
143 if (ace_list->inherited)
144 num_entries++;
145 return num_entries;
146 }
147
148 /************************************************************************
149 Create the on-disk format. Caller must free.
150 ************************************************************************/
151
152 static char *create_pai_buf(canon_ace *file_ace_list, canon_ace *dir_ace_list, BOOL pai_protected, size_t *store_size)
153 {
154 char *pai_buf = NULL;
155 canon_ace *ace_list = NULL;
156 char *entry_offset = NULL;
157 unsigned int num_entries = 0;
158 unsigned int num_def_entries = 0;
159
160 for (ace_list = file_ace_list; ace_list; ace_list = ace_list->next)
161 if (ace_list->inherited)
162 num_entries++;
163
164 for (ace_list = dir_ace_list; ace_list; ace_list = ace_list->next)
165 if (ace_list->inherited)
166 num_def_entries++;
167
168 DEBUG(10,("create_pai_buf: num_entries = %u, num_def_entries = %u\n", num_entries, num_def_entries ));
169
170 *store_size = PAI_ENTRIES_BASE + ((num_entries + num_def_entries)*PAI_ENTRY_LENGTH);
171
172 pai_buf = SMB_MALLOC(*store_size);
173 if (!pai_buf) {
174 return NULL;
175 }
176
177 /* Set up the header. */
178 memset(pai_buf, '\0', PAI_ENTRIES_BASE);
179 SCVAL(pai_buf,PAI_VERSION_OFFSET,PAI_VERSION);
180 SCVAL(pai_buf,PAI_FLAG_OFFSET,(pai_protected ? PAI_ACL_FLAG_PROTECTED : 0));
181 SSVAL(pai_buf,PAI_NUM_ENTRIES_OFFSET,num_entries);
182 SSVAL(pai_buf,PAI_NUM_DEFAULT_ENTRIES_OFFSET,num_def_entries);
183
184 entry_offset = pai_buf + PAI_ENTRIES_BASE;
185
186 for (ace_list = file_ace_list; ace_list; ace_list = ace_list->next) {
187 if (ace_list->inherited) {
188 uint8 type_val = (unsigned char)ace_list->owner_type;
189 uint32 entry_val = get_entry_val(ace_list);
190
191 SCVAL(entry_offset,0,type_val);
192 SIVAL(entry_offset,1,entry_val);
193 entry_offset += PAI_ENTRY_LENGTH;
194 }
195 }
196
197 for (ace_list = dir_ace_list; ace_list; ace_list = ace_list->next) {
198 if (ace_list->inherited) {
199 uint8 type_val = (unsigned char)ace_list->owner_type;
200 uint32 entry_val = get_entry_val(ace_list);
201
202 SCVAL(entry_offset,0,type_val);
203 SIVAL(entry_offset,1,entry_val);
204 entry_offset += PAI_ENTRY_LENGTH;
205 }
206 }
207
208 return pai_buf;
209 }
210
211 /************************************************************************
212 Store the user.SAMBA_PAI attribute on disk.
213 ************************************************************************/
214
215 static void store_inheritance_attributes(files_struct *fsp, canon_ace *file_ace_list,
216 canon_ace *dir_ace_list, BOOL pai_protected)
217 {
218 int ret;
219 size_t store_size;
220 char *pai_buf;
221
222 if (!lp_map_acl_inherit(SNUM(fsp->conn)))
223 return;
224
225 /*
226 * Don't store if this ACL isn't protected and
227 * none of the entries in it are marked as inherited.
228 */
229
230 if (!pai_protected && num_inherited_entries(file_ace_list) == 0 && num_inherited_entries(dir_ace_list) == 0) {
231 /* Instead just remove the attribute if it exists. */
232 if (fsp->fh->fd != -1)
233 SMB_VFS_FREMOVEXATTR(fsp, fsp->fh->fd, SAMBA_POSIX_INHERITANCE_EA_NAME);
234 else
235 SMB_VFS_REMOVEXATTR(fsp->conn, fsp->fsp_name, SAMBA_POSIX_INHERITANCE_EA_NAME);
236 return;
237 }
238
239 pai_buf = create_pai_buf(file_ace_list, dir_ace_list, pai_protected, &store_size);
240
241 if (fsp->fh->fd != -1)
242 ret = SMB_VFS_FSETXATTR(fsp, fsp->fh->fd, SAMBA_POSIX_INHERITANCE_EA_NAME,
243 pai_buf, store_size, 0);
244 else
245 ret = SMB_VFS_SETXATTR(fsp->conn,fsp->fsp_name, SAMBA_POSIX_INHERITANCE_EA_NAME,
246 pai_buf, store_size, 0);
247
248 SAFE_FREE(pai_buf);
249
250 DEBUG(10,("store_inheritance_attribute:%s for file %s\n", pai_protected ? " (protected)" : "", fsp->fsp_name));
251 if (ret == -1 && !no_acl_syscall_error(errno))
252 DEBUG(1,("store_inheritance_attribute: Error %s\n", strerror(errno) ));
253 }
254
255 /************************************************************************
256 Delete the in memory inheritance info.
257 ************************************************************************/
258
259 static void free_inherited_info(struct pai_val *pal)
260 {
261 if (pal) {
262 struct pai_entry *paie, *paie_next;
263 for (paie = pal->entry_list; paie; paie = paie_next) {
264 paie_next = paie->next;
265 SAFE_FREE(paie);
266 }
267 for (paie = pal->def_entry_list; paie; paie = paie_next) {
268 paie_next = paie->next;
269 SAFE_FREE(paie);
270 }
271 SAFE_FREE(pal);
272 }
273 }
274
275 /************************************************************************
276 Was this ACL protected ?
277 ************************************************************************/
278
279 static BOOL get_protected_flag(struct pai_val *pal)
280 {
281 if (!pal)
282 return False;
283 return pal->pai_protected;
284 }
285
286 /************************************************************************
287 Was this ACE inherited ?
288 ************************************************************************/
289
290 static BOOL get_inherited_flag(struct pai_val *pal, canon_ace *ace_entry, BOOL default_ace)
291 {
292 struct pai_entry *paie;
293
294 if (!pal)
295 return False;
296
297 /* If the entry exists it is inherited. */
298 for (paie = (default_ace ? pal->def_entry_list : pal->entry_list); paie; paie = paie->next) {
299 if (ace_entry->owner_type == paie->owner_type &&
300 get_entry_val(ace_entry) == get_pai_entry_val(paie))
301 return True;
302 }
303 return False;
304 }
305
306 /************************************************************************
307 Ensure an attribute just read is valid.
308 ************************************************************************/
309
310 static BOOL check_pai_ok(char *pai_buf, size_t pai_buf_data_size)
311 {
312 uint16 num_entries;
313 uint16 num_def_entries;
314
315 if (pai_buf_data_size < PAI_ENTRIES_BASE) {
316 /* Corrupted - too small. */
317 return False;
318 }
319
320 if (CVAL(pai_buf,PAI_VERSION_OFFSET) != PAI_VERSION)
321 return False;
322
323 num_entries = SVAL(pai_buf,PAI_NUM_ENTRIES_OFFSET);
324 num_def_entries = SVAL(pai_buf,PAI_NUM_DEFAULT_ENTRIES_OFFSET);
325
326 /* Check the entry lists match. */
327 /* Each entry is 5 bytes (type plus 4 bytes of uid or gid). */
328
329 if (((num_entries + num_def_entries)*PAI_ENTRY_LENGTH) + PAI_ENTRIES_BASE != pai_buf_data_size)
330 return False;
331
332 return True;
333 }
334
335
336 /************************************************************************
337 Convert to in-memory format.
338 ************************************************************************/
339
340 static struct pai_val *create_pai_val(char *buf, size_t size)
341 {
342 char *entry_offset;
343 struct pai_val *paiv = NULL;
344 int i;
345
346 if (!check_pai_ok(buf, size))
347 return NULL;
348
349 paiv = SMB_MALLOC_P(struct pai_val);
350 if (!paiv)
351 return NULL;
352
353 memset(paiv, '\0', sizeof(struct pai_val));
354
355 paiv->pai_protected = (CVAL(buf,PAI_FLAG_OFFSET) == PAI_ACL_FLAG_PROTECTED);
356
357 paiv->num_entries = SVAL(buf,PAI_NUM_ENTRIES_OFFSET);
358 paiv->num_def_entries = SVAL(buf,PAI_NUM_DEFAULT_ENTRIES_OFFSET);
359
360 entry_offset = buf + PAI_ENTRIES_BASE;
361
362 DEBUG(10,("create_pai_val:%s num_entries = %u, num_def_entries = %u\n",
363 paiv->pai_protected ? " (pai_protected)" : "", paiv->num_entries, paiv->num_def_entries ));
364
365 for (i = 0; i < paiv->num_entries; i++) {
366 struct pai_entry *paie;
367
368 paie = SMB_MALLOC_P(struct pai_entry);
369 if (!paie) {
370 free_inherited_info(paiv);
371 return NULL;
372 }
373
374 paie->owner_type = (enum ace_owner)CVAL(entry_offset,0);
375 switch( paie->owner_type) {
376 case UID_ACE:
377 paie->unix_ug.uid = (uid_t)IVAL(entry_offset,1);
378 DEBUG(10,("create_pai_val: uid = %u\n", (unsigned int)paie->unix_ug.uid ));
379 break;
380 case GID_ACE:
381 paie->unix_ug.gid = (gid_t)IVAL(entry_offset,1);
382 DEBUG(10,("create_pai_val: gid = %u\n", (unsigned int)paie->unix_ug.gid ));
383 break;
384 case WORLD_ACE:
385 paie->unix_ug.world = -1;
386 DEBUG(10,("create_pai_val: world ace\n"));
387 break;
388 default:
389 free_inherited_info(paiv);
390 return NULL;
391 }
392 entry_offset += PAI_ENTRY_LENGTH;
393 DLIST_ADD(paiv->entry_list, paie);
394 }
395
396 for (i = 0; i < paiv->num_def_entries; i++) {
397 struct pai_entry *paie;
398
399 paie = SMB_MALLOC_P(struct pai_entry);
400 if (!paie) {
401 free_inherited_info(paiv);
402 return NULL;
403 }
404
405 paie->owner_type = (enum ace_owner)CVAL(entry_offset,0);
406 switch( paie->owner_type) {
407 case UID_ACE:
408 paie->unix_ug.uid = (uid_t)IVAL(entry_offset,1);
409 DEBUG(10,("create_pai_val: (def) uid = %u\n", (unsigned int)paie->unix_ug.uid ));
410 break;
411 case GID_ACE:
412 paie->unix_ug.gid = (gid_t)IVAL(entry_offset,1);
413 DEBUG(10,("create_pai_val: (def) gid = %u\n", (unsigned int)paie->unix_ug.gid ));
414 break;
415 case WORLD_ACE:
416 paie->unix_ug.world = -1;
417 DEBUG(10,("create_pai_val: (def) world ace\n"));
418 break;
419 default:
420 free_inherited_info(paiv);
421 return NULL;
422 }
423 entry_offset += PAI_ENTRY_LENGTH;
424 DLIST_ADD(paiv->def_entry_list, paie);
425 }
426
427 return paiv;
428 }
429
430 /************************************************************************
431 Load the user.SAMBA_PAI attribute.
432 ************************************************************************/
433
434 static struct pai_val *load_inherited_info(files_struct *fsp)
435 {
436 char *pai_buf;
437 size_t pai_buf_size = 1024;
438 struct pai_val *paiv = NULL;
439 ssize_t ret;
440
441 if (!lp_map_acl_inherit(SNUM(fsp->conn)))
442 return NULL;
443
444 if ((pai_buf = SMB_MALLOC(pai_buf_size)) == NULL)
445 return NULL;
446
447 do {
448 if (fsp->fh->fd != -1)
449 ret = SMB_VFS_FGETXATTR(fsp, fsp->fh->fd, SAMBA_POSIX_INHERITANCE_EA_NAME,
450 pai_buf, pai_buf_size);
451 else
452 ret = SMB_VFS_GETXATTR(fsp->conn,fsp->fsp_name,SAMBA_POSIX_INHERITANCE_EA_NAME,
453 pai_buf, pai_buf_size);
454
455 if (ret == -1) {
456 if (errno != ERANGE) {
457 break;
458 }
459 /* Buffer too small - enlarge it. */
460 pai_buf_size *= 2;
461 SAFE_FREE(pai_buf);
462 if (pai_buf_size > 1024*1024) {
463 return NULL; /* Limit malloc to 1mb. */
464 }
465 if ((pai_buf = SMB_MALLOC(pai_buf_size)) == NULL)
466 return NULL;
467 }
468 } while (ret == -1);
469
470 DEBUG(10,("load_inherited_info: ret = %lu for file %s\n", (unsigned long)ret, fsp->fsp_name));
471
472 if (ret == -1) {
473 /* No attribute or not supported. */
474 #if defined(ENOATTR)
475 if (errno != ENOATTR)
476 DEBUG(10,("load_inherited_info: Error %s\n", strerror(errno) ));
477 #else
478 if (errno != ENOSYS)
479 DEBUG(10,("load_inherited_info: Error %s\n", strerror(errno) ));
480 #endif
481 SAFE_FREE(pai_buf);
482 return NULL;
483 }
484
485 paiv = create_pai_val(pai_buf, ret);
486
487 if (paiv && paiv->pai_protected)
488 DEBUG(10,("load_inherited_info: ACL is protected for file %s\n", fsp->fsp_name));
489
490 SAFE_FREE(pai_buf);
491 return paiv;
492 }
493
494 /****************************************************************************
495 Functions to manipulate the internal ACE format.
496 ****************************************************************************/
497
498 /****************************************************************************
499 Count a linked list of canonical ACE entries.
500 ****************************************************************************/
501
502 static size_t count_canon_ace_list( canon_ace *list_head )
503 {
504 size_t count = 0;
505 canon_ace *ace;
506
507 for (ace = list_head; ace; ace = ace->next)
508 count++;
509
510 return count;
511 }
512
513 /****************************************************************************
514 Free a linked list of canonical ACE entries.
515 ****************************************************************************/
516
517 static void free_canon_ace_list( canon_ace *list_head )
518 {
519 while (list_head) {
520 canon_ace *old_head = list_head;
521 DLIST_REMOVE(list_head, list_head);
522 SAFE_FREE(old_head);
523 }
524 }
525
526 /****************************************************************************
527 Function to duplicate a canon_ace entry.
528 ****************************************************************************/
529
530 static canon_ace *dup_canon_ace( canon_ace *src_ace)
531 {
532 canon_ace *dst_ace = SMB_MALLOC_P(canon_ace);
533
534 if (dst_ace == NULL)
535 return NULL;
536
537 *dst_ace = *src_ace;
538 dst_ace->prev = dst_ace->next = NULL;
539 return dst_ace;
540 }
541
542 /****************************************************************************
543 Print out a canon ace.
544 ****************************************************************************/
545
546 static void print_canon_ace(canon_ace *pace, int num)
547 {
548 fstring str;
549
550 dbgtext( "canon_ace index %d. Type = %s ", num, pace->attr == ALLOW_ACE ? "allow" : "deny" );
551 dbgtext( "SID = %s ", sid_to_string( str, &pace->trustee));
552 if (pace->owner_type == UID_ACE) {
553 const char *u_name = uidtoname(pace->unix_ug.uid);
554 dbgtext( "uid %u (%s) ", (unsigned int)pace->unix_ug.uid, u_name );
555 } else if (pace->owner_type == GID_ACE) {
556 char *g_name = gidtoname(pace->unix_ug.gid);
557 dbgtext( "gid %u (%s) ", (unsigned int)pace->unix_ug.gid, g_name );
558 } else
559 dbgtext( "other ");
560 switch (pace->type) {
561 case SMB_ACL_USER:
562 dbgtext( "SMB_ACL_USER ");
563 break;
564 case SMB_ACL_USER_OBJ:
565 dbgtext( "SMB_ACL_USER_OBJ ");
566 break;
567 case SMB_ACL_GROUP:
568 dbgtext( "SMB_ACL_GROUP ");
569 break;
570 case SMB_ACL_GROUP_OBJ:
571 dbgtext( "SMB_ACL_GROUP_OBJ ");
572 break;
573 case SMB_ACL_OTHER:
574 dbgtext( "SMB_ACL_OTHER ");
575 break;
576 }
577 if (pace->inherited)
578 dbgtext( "(inherited) ");
579 dbgtext( "perms ");
580 dbgtext( "%c", pace->perms & S_IRUSR ? 'r' : '-');
581 dbgtext( "%c", pace->perms & S_IWUSR ? 'w' : '-');
582 dbgtext( "%c\n", pace->perms & S_IXUSR ? 'x' : '-');
583 }
584
585 /****************************************************************************
586 Print out a canon ace list.
587 ****************************************************************************/
588
589 static void print_canon_ace_list(const char *name, canon_ace *ace_list)
590 {
591 int count = 0;
592
593 if( DEBUGLVL( 10 )) {
594 dbgtext( "print_canon_ace_list: %s\n", name );
595 for (;ace_list; ace_list = ace_list->next, count++)
596 print_canon_ace(ace_list, count );
597 }
598 }
599
600 /****************************************************************************
601 Map POSIX ACL perms to canon_ace permissions (a mode_t containing only S_(R|W|X)USR bits).
602 ****************************************************************************/
603
604 static mode_t convert_permset_to_mode_t(connection_struct *conn, SMB_ACL_PERMSET_T permset)
605 {
606 mode_t ret = 0;
607
608 ret |= (SMB_VFS_SYS_ACL_GET_PERM(conn, permset, SMB_ACL_READ) ? S_IRUSR : 0);
609 ret |= (SMB_VFS_SYS_ACL_GET_PERM(conn, permset, SMB_ACL_WRITE) ? S_IWUSR : 0);
610 ret |= (SMB_VFS_SYS_ACL_GET_PERM(conn, permset, SMB_ACL_EXECUTE) ? S_IXUSR : 0);
611
612 return ret;
613 }
614
615 /****************************************************************************
616 Map generic UNIX permissions to canon_ace permissions (a mode_t containing only S_(R|W|X)USR bits).
617 ****************************************************************************/
618
619 static mode_t unix_perms_to_acl_perms(mode_t mode, int r_mask, int w_mask, int x_mask)
620 {
621 mode_t ret = 0;
622
623 if (mode & r_mask)
624 ret |= S_IRUSR;
625 if (mode & w_mask)
626 ret |= S_IWUSR;
627 if (mode & x_mask)
628 ret |= S_IXUSR;
629
630 return ret;
631 }
632
633 /****************************************************************************
634 Map canon_ace permissions (a mode_t containing only S_(R|W|X)USR bits) to
635 an SMB_ACL_PERMSET_T.
636 ****************************************************************************/
637
638 static int map_acl_perms_to_permset(connection_struct *conn, mode_t mode, SMB_ACL_PERMSET_T *p_permset)
639 {
640 if (SMB_VFS_SYS_ACL_CLEAR_PERMS(conn, *p_permset) == -1)
641 return -1;
642 if (mode & S_IRUSR) {
643 if (SMB_VFS_SYS_ACL_ADD_PERM(conn, *p_permset, SMB_ACL_READ) == -1)
644 return -1;
645 }
646 if (mode & S_IWUSR) {
647 if (SMB_VFS_SYS_ACL_ADD_PERM(conn, *p_permset, SMB_ACL_WRITE) == -1)
648 return -1;
649 }
650 if (mode & S_IXUSR) {
651 if (SMB_VFS_SYS_ACL_ADD_PERM(conn, *p_permset, SMB_ACL_EXECUTE) == -1)
652 return -1;
653 }
654 return 0;
655 }
656 /****************************************************************************
657 Function to create owner and group SIDs from a SMB_STRUCT_STAT.
658 ****************************************************************************/
659
660 static void create_file_sids(SMB_STRUCT_STAT *psbuf, DOM_SID *powner_sid, DOM_SID *pgroup_sid)
661 {
662 uid_to_sid( powner_sid, psbuf->st_uid );
663 gid_to_sid( pgroup_sid, psbuf->st_gid );
664 }
665
666 /****************************************************************************
667 Merge aces with a common sid - if both are allow or deny, OR the permissions together and
668 delete the second one. If the first is deny, mask the permissions off and delete the allow
669 if the permissions become zero, delete the deny if the permissions are non zero.
670 ****************************************************************************/
671
672 static void merge_aces( canon_ace **pp_list_head )
673 {
674 canon_ace *list_head = *pp_list_head;
675 canon_ace *curr_ace_outer;
676 canon_ace *curr_ace_outer_next;
677
678 /*
679 * First, merge allow entries with identical SIDs, and deny entries
680 * with identical SIDs.
681 */
682
683 for (curr_ace_outer = list_head; curr_ace_outer; curr_ace_outer = curr_ace_outer_next) {
684 canon_ace *curr_ace;
685 canon_ace *curr_ace_next;
686
687 curr_ace_outer_next = curr_ace_outer->next; /* Save the link in case we delete. */
688
689 for (curr_ace = curr_ace_outer->next; curr_ace; curr_ace = curr_ace_next) {
690
691 curr_ace_next = curr_ace->next; /* Save the link in case of delete. */
692
693 if (sid_equal(&curr_ace->trustee, &curr_ace_outer->trustee) &&
694 (curr_ace->attr == curr_ace_outer->attr)) {
695
696 if( DEBUGLVL( 10 )) {
697 dbgtext("merge_aces: Merging ACE's\n");
698 print_canon_ace( curr_ace_outer, 0);
699 print_canon_ace( curr_ace, 0);
700 }
701
702 /* Merge two allow or two deny ACE's. */
703
704 curr_ace_outer->perms |= curr_ace->perms;
705 DLIST_REMOVE(list_head, curr_ace);
706 SAFE_FREE(curr_ace);
707 curr_ace_outer_next = curr_ace_outer->next; /* We may have deleted the link. */
708 }
709 }
710 }
711
712 /*
713 * Now go through and mask off allow permissions with deny permissions.
714 * We can delete either the allow or deny here as we know that each SID
715 * appears only once in the list.
716 */
717
718 for (curr_ace_outer = list_head; curr_ace_outer; curr_ace_outer = curr_ace_outer_next) {
719 canon_ace *curr_ace;
720 canon_ace *curr_ace_next;
721
722 curr_ace_outer_next = curr_ace_outer->next; /* Save the link in case we delete. */
723
724 for (curr_ace = curr_ace_outer->next; curr_ace; curr_ace = curr_ace_next) {
725
726 curr_ace_next = curr_ace->next; /* Save the link in case of delete. */
727
728 /*
729 * Subtract ACE's with different entries. Due to the ordering constraints
730 * we've put on the ACL, we know the deny must be the first one.
731 */
732
733 if (sid_equal(&curr_ace->trustee, &curr_ace_outer->trustee) &&
734 (curr_ace_outer->attr == DENY_ACE) && (curr_ace->attr == ALLOW_ACE)) {
735
736 if( DEBUGLVL( 10 )) {
737 dbgtext("merge_aces: Masking ACE's\n");
738 print_canon_ace( curr_ace_outer, 0);
739 print_canon_ace( curr_ace, 0);
740 }
741
742 curr_ace->perms &= ~curr_ace_outer->perms;
743
744 if (curr_ace->perms == 0) {
745
746 /*
747 * The deny overrides the allow. Remove the allow.
748 */
749
750 DLIST_REMOVE(list_head, curr_ace);
751 SAFE_FREE(curr_ace);
752 curr_ace_outer_next = curr_ace_outer->next; /* We may have deleted the link. */
753
754 } else {
755
756 /*
757 * Even after removing permissions, there
758 * are still allow permissions - delete the deny.
759 * It is safe to delete the deny here,
760 * as we are guarenteed by the deny first
761 * ordering that all the deny entries for
762 * this SID have already been merged into one
763 * before we can get to an allow ace.
764 */
765
766 DLIST_REMOVE(list_head, curr_ace_outer);
767 SAFE_FREE(curr_ace_outer);
768 break;
769 }
770 }
771
772 } /* end for curr_ace */
773 } /* end for curr_ace_outer */
774
775 /* We may have modified the list. */
776
777 *pp_list_head = list_head;
778 }
779
780 /****************************************************************************
781 Check if we need to return NT4.x compatible ACL entries.
782 ****************************************************************************/
783
784 static BOOL nt4_compatible_acls(void)
785 {
786 int compat = lp_acl_compatibility();
787
788 if (compat == ACL_COMPAT_AUTO) {
789 enum remote_arch_types ra_type = get_remote_arch();
790
791 /* Automatically adapt to client */
792 return (ra_type <= RA_WINNT);
793 } else
794 return (compat == ACL_COMPAT_WINNT);
795 }
796
797
798 /****************************************************************************
799 Map canon_ace perms to permission bits NT.
800 The attr element is not used here - we only process deny entries on set,
801 not get. Deny entries are implicit on get with ace->perms = 0.
802 ****************************************************************************/
803
804 static SEC_ACCESS map_canon_ace_perms(int snum, int *pacl_type, DOM_SID *powner_sid, canon_ace *ace, BOOL directory_ace)
805 {
806 SEC_ACCESS sa;
807 uint32 nt_mask = 0;
808
809 *pacl_type = SEC_ACE_TYPE_ACCESS_ALLOWED;
810
811 if (lp_acl_map_full_control(snum) && ((ace->perms & ALL_ACE_PERMS) == ALL_ACE_PERMS)) {
812 if (directory_ace) {
813 nt_mask = UNIX_DIRECTORY_ACCESS_RWX;
814 } else {
815 nt_mask = UNIX_ACCESS_RWX;
816 }
817 } else if ((ace->perms & ALL_ACE_PERMS) == (mode_t)0) {
818 /*
819 * Windows NT refuses to display ACEs with no permissions in them (but
820 * they are perfectly legal with Windows 2000). If the ACE has empty
821 * permissions we cannot use 0, so we use the otherwise unused
822 * WRITE_OWNER permission, which we ignore when we set an ACL.
823 * We abstract this into a #define of UNIX_ACCESS_NONE to allow this
824 * to be changed in the future.
825 */
826
827 if (nt4_compatible_acls())
828 nt_mask = UNIX_ACCESS_NONE;
829 else
830 nt_mask = 0;
831 } else {
832 if (directory_ace) {
833 nt_mask |= ((ace->perms & S_IRUSR) ? UNIX_DIRECTORY_ACCESS_R : 0 );
834 nt_mask |= ((ace->perms & S_IWUSR) ? UNIX_DIRECTORY_ACCESS_W : 0 );
835 nt_mask |= ((ace->perms & S_IXUSR) ? UNIX_DIRECTORY_ACCESS_X : 0 );
836 } else {
837 nt_mask |= ((ace->perms & S_IRUSR) ? UNIX_ACCESS_R : 0 );
838 nt_mask |= ((ace->perms & S_IWUSR) ? UNIX_ACCESS_W : 0 );
839 nt_mask |= ((ace->perms & S_IXUSR) ? UNIX_ACCESS_X : 0 );
840 }
841 }
842
843 DEBUG(10,("map_canon_ace_perms: Mapped (UNIX) %x to (NT) %x\n",
844 (unsigned int)ace->perms, (unsigned int)nt_mask ));
845
846 init_sec_access(&sa,nt_mask);
847 return sa;
848 }
849
850 /****************************************************************************
851 Map NT perms to a UNIX mode_t.
852 ****************************************************************************/
853
854 #define FILE_SPECIFIC_READ_BITS (FILE_READ_DATA|FILE_READ_EA|FILE_READ_ATTRIBUTES)
855 #define FILE_SPECIFIC_WRITE_BITS (FILE_WRITE_DATA|FILE_APPEND_DATA|FILE_WRITE_EA|FILE_WRITE_ATTRIBUTES)
856 #define FILE_SPECIFIC_EXECUTE_BITS (FILE_EXECUTE)
857
858 static mode_t map_nt_perms( SEC_ACCESS sec_access, int type)
859 {
860 mode_t mode = 0;
861
862 switch(type) {
863 case S_IRUSR:
864 if(sec_access.mask & GENERIC_ALL_ACCESS)
865 mode = S_IRUSR|S_IWUSR|S_IXUSR;
866 else {
867 mode |= (sec_access.mask & (GENERIC_READ_ACCESS|FILE_SPECIFIC_READ_BITS)) ? S_IRUSR : 0;
868 mode |= (sec_access.mask & (GENERIC_WRITE_ACCESS|FILE_SPECIFIC_WRITE_BITS)) ? S_IWUSR : 0;
869 mode |= (sec_access.mask & (GENERIC_EXECUTE_ACCESS|FILE_SPECIFIC_EXECUTE_BITS)) ? S_IXUSR : 0;
870 }
871 break;
872 case S_IRGRP:
873 if(sec_access.mask & GENERIC_ALL_ACCESS)
874 mode = S_IRGRP|S_IWGRP|S_IXGRP;
875 else {
876 mode |= (sec_access.mask & (GENERIC_READ_ACCESS|FILE_SPECIFIC_READ_BITS)) ? S_IRGRP : 0;
877 mode |= (sec_access.mask & (GENERIC_WRITE_ACCESS|FILE_SPECIFIC_WRITE_BITS)) ? S_IWGRP : 0;
878 mode |= (sec_access.mask & (GENERIC_EXECUTE_ACCESS|FILE_SPECIFIC_EXECUTE_BITS)) ? S_IXGRP : 0;
879 }
880 break;
881 case S_IROTH:
882 if(sec_access.mask & GENERIC_ALL_ACCESS)
883 mode = S_IROTH|S_IWOTH|S_IXOTH;
884 else {
885 mode |= (sec_access.mask & (GENERIC_READ_ACCESS|FILE_SPECIFIC_READ_BITS)) ? S_IROTH : 0;
886 mode |= (sec_access.mask & (GENERIC_WRITE_ACCESS|FILE_SPECIFIC_WRITE_BITS)) ? S_IWOTH : 0;
887 mode |= (sec_access.mask & (GENERIC_EXECUTE_ACCESS|FILE_SPECIFIC_EXECUTE_BITS)) ? S_IXOTH : 0;
888 }
889 break;
890 }
891
892 return mode;
893 }
894
895 /****************************************************************************
896 Unpack a SEC_DESC into a UNIX owner and group.
897 ****************************************************************************/
898
899 static BOOL unpack_nt_owners(int snum, SMB_STRUCT_STAT *psbuf, uid_t *puser, gid_t *pgrp, uint32 security_info_sent, SEC_DESC *psd)
900 {
901 DOM_SID owner_sid;
902 DOM_SID grp_sid;
903
904 *puser = (uid_t)-1;
905 *pgrp = (gid_t)-1;
906
907 if(security_info_sent == 0) {
908 DEBUG(0,("unpack_nt_owners: no security info sent !\n"));
909 return True;
910 }
911
912 /*
913 * Validate the owner and group SID's.
914 */
915
916 memset(&owner_sid, '\0', sizeof(owner_sid));
917 memset(&grp_sid, '\0', sizeof(grp_sid));
918
919 DEBUG(5,("unpack_nt_owners: validating owner_sids.\n"));
920
921 /*
922 * Don't immediately fail if the owner sid cannot be validated.
923 * This may be a group chown only set.
924 */
925
926 if (security_info_sent & OWNER_SECURITY_INFORMATION) {
927 sid_copy(&owner_sid, psd->owner_sid);
928 if (!sid_to_uid(&owner_sid, puser)) {
929 if (lp_force_unknown_acl_user(snum)) {
930 /* this allows take ownership to work
931 * reasonably */
932 *puser = current_user.ut.uid;
933 } else {
934 DEBUG(3,("unpack_nt_owners: unable to validate"
935 " owner sid for %s\n",
936 sid_string_static(&owner_sid)));
937 return False;
938 }
939 }
940 }
941
942 /*
943 * Don't immediately fail if the group sid cannot be validated.
944 * This may be an owner chown only set.
945 */
946
947 if (security_info_sent & GROUP_SECURITY_INFORMATION) {
948 sid_copy(&grp_sid, psd->grp_sid);
949 if (!sid_to_gid( &grp_sid, pgrp)) {
950 if (lp_force_unknown_acl_user(snum)) {
951 /* this allows take group ownership to work
952 * reasonably */
953 *pgrp = current_user.ut.gid;
954 } else {
955 DEBUG(3,("unpack_nt_owners: unable to validate"
956 " group sid.\n"));
957 return False;
958 }
959 }
960 }
961
962 DEBUG(5,("unpack_nt_owners: owner_sids validated.\n"));
963
964 return True;
965 }
966
967 /****************************************************************************
968 Ensure the enforced permissions for this share apply.
969 ****************************************************************************/
970
971 static void apply_default_perms(files_struct *fsp, canon_ace *pace, mode_t type)
972 {
973 int snum = SNUM(fsp->conn);
974 mode_t and_bits = (mode_t)0;
975 mode_t or_bits = (mode_t)0;
976
977 /* Get the initial bits to apply. */
978
979 if (fsp->is_directory) {
980 and_bits = lp_dir_security_mask(snum);
981 or_bits = lp_force_dir_security_mode(snum);
982 } else {
983 and_bits = lp_security_mask(snum);
984 or_bits = lp_force_security_mode(snum);
985 }
986
987 /* Now bounce them into the S_USR space. */
988 switch(type) {
989 case S_IRUSR:
990 /* Ensure owner has read access. */
991 pace->perms |= S_IRUSR;
992 if (fsp->is_directory)
993 pace->perms |= (S_IWUSR|S_IXUSR);
994 and_bits = unix_perms_to_acl_perms(and_bits, S_IRUSR, S_IWUSR, S_IXUSR);
995 or_bits = unix_perms_to_acl_perms(or_bits, S_IRUSR, S_IWUSR, S_IXUSR);
996 break;
997 case S_IRGRP:
998 and_bits = unix_perms_to_acl_perms(and_bits, S_IRGRP, S_IWGRP, S_IXGRP);
999 or_bits = unix_perms_to_acl_perms(or_bits, S_IRGRP, S_IWGRP, S_IXGRP);
1000 break;
1001 case S_IROTH:
1002 and_bits = unix_perms_to_acl_perms(and_bits, S_IROTH, S_IWOTH, S_IXOTH);
1003 or_bits = unix_perms_to_acl_perms(or_bits, S_IROTH, S_IWOTH, S_IXOTH);
1004 break;
1005 }
1006
1007 pace->perms = ((pace->perms & and_bits)|or_bits);
1008 }
1009
1010 /****************************************************************************
1011 Check if a given uid/SID is in a group gid/SID. This is probably very
1012 expensive and will need optimisation. A *lot* of optimisation :-). JRA.
1013 ****************************************************************************/
1014
1015 static BOOL uid_entry_in_group( canon_ace *uid_ace, canon_ace *group_ace )
1016 {
1017 fstring u_name;
1018
1019 /* "Everyone" always matches every uid. */
1020
1021 if (sid_equal(&group_ace->trustee, &global_sid_World))
1022 return True;
1023
1024 /* Assume that the current user is in the current group (force group) */
1025
1026 if (uid_ace->unix_ug.uid == current_user.ut.uid && group_ace->unix_ug.gid == current_user.ut.gid)
1027 return True;
1028
1029 fstrcpy(u_name, uidtoname(uid_ace->unix_ug.uid));
1030 return user_in_group_sid(u_name, &group_ace->trustee);
1031 }
1032
1033 /****************************************************************************
1034 A well formed POSIX file or default ACL has at least 3 entries, a
1035 SMB_ACL_USER_OBJ, SMB_ACL_GROUP_OBJ, SMB_ACL_OTHER_OBJ.
1036 In addition, the owner must always have at least read access.
1037 When using this call on get_acl, the pst struct is valid and contains
1038 the mode of the file. When using this call on set_acl, the pst struct has
1039 been modified to have a mode containing the default for this file or directory
1040 type.
1041 ****************************************************************************/
1042
1043 static BOOL ensure_canon_entry_valid(canon_ace **pp_ace,
1044 files_struct *fsp,
1045 const DOM_SID *pfile_owner_sid,
1046 const DOM_SID *pfile_grp_sid,
1047 SMB_STRUCT_STAT *pst,
1048 BOOL setting_acl)
1049 {
1050 canon_ace *pace;
1051 BOOL got_user = False;
1052 BOOL got_grp = False;
1053 BOOL got_other = False;
1054 canon_ace *pace_other = NULL;
1055
1056 for (pace = *pp_ace; pace; pace = pace->next) {
1057 if (pace->type == SMB_ACL_USER_OBJ) {
1058
1059 if (setting_acl)
1060 apply_default_perms(fsp, pace, S_IRUSR);
1061 got_user = True;
1062
1063 } else if (pace->type == SMB_ACL_GROUP_OBJ) {
1064
1065 /*
1066 * Ensure create mask/force create mode is respected on set.
1067 */
1068
1069 if (setting_acl)
1070 apply_default_perms(fsp, pace, S_IRGRP);
1071 got_grp = True;
1072
1073 } else if (pace->type == SMB_ACL_OTHER) {
1074
1075 /*
1076 * Ensure create mask/force create mode is respected on set.
1077 */
1078
1079 if (setting_acl)
1080 apply_default_perms(fsp, pace, S_IROTH);
1081 got_other = True;
1082 pace_other = pace;
1083 }
1084 }
1085
1086 if (!got_user) {
1087 if ((pace = SMB_MALLOC_P(canon_ace)) == NULL) {
1088 DEBUG(0,("ensure_canon_entry_valid: malloc fail.\n"));
1089 return False;
1090 }
1091
1092 ZERO_STRUCTP(pace);
1093 pace->type = SMB_ACL_USER_OBJ;
1094 pace->owner_type = UID_ACE;
1095 pace->unix_ug.uid = pst->st_uid;
1096 pace->trustee = *pfile_owner_sid;
1097 pace->attr = ALLOW_ACE;
1098
1099 if (setting_acl) {
1100 /* See if the owning user is in any of the other groups in
1101 the ACE. If so, OR in the permissions from that group. */
1102
1103 BOOL group_matched = False;
1104 canon_ace *pace_iter;
1105
1106 for (pace_iter = *pp_ace; pace_iter; pace_iter = pace_iter->next) {
1107 if (pace_iter->type == SMB_ACL_GROUP_OBJ || pace_iter->type == SMB_ACL_GROUP) {
1108 if (uid_entry_in_group(pace, pace_iter)) {
1109 pace->perms |= pace_iter->perms;
1110 group_matched = True;
1111 }
1112 }
1113 }
1114
1115 /* If we only got an "everyone" perm, just use that. */
1116 if (!group_matched) {
1117 if (got_other)
1118 pace->perms = pace_other->perms;
1119 else
1120 pace->perms = 0;
1121 }
1122
1123 apply_default_perms(fsp, pace, S_IRUSR);
1124 } else {
1125 pace->perms = unix_perms_to_acl_perms(pst->st_mode, S_IRUSR, S_IWUSR, S_IXUSR);
1126 }
1127
1128 DLIST_ADD(*pp_ace, pace);
1129 }
1130
1131 if (!got_grp) {
1132 if ((pace = SMB_MALLOC_P(canon_ace)) == NULL) {
1133 DEBUG(0,("ensure_canon_entry_valid: malloc fail.\n"));
1134 return False;
1135 }
1136
1137 ZERO_STRUCTP(pace);
1138 pace->type = SMB_ACL_GROUP_OBJ;
1139 pace->owner_type = GID_ACE;
1140 pace->unix_ug.uid = pst->st_gid;
1141 pace->trustee = *pfile_grp_sid;
1142 pace->attr = ALLOW_ACE;
1143 if (setting_acl) {
1144 /* If we only got an "everyone" perm, just use that. */
1145 if (got_other)
1146 pace->perms = pace_other->perms;
1147 else
1148 pace->perms = 0;
1149 apply_default_perms(fsp, pace, S_IRGRP);
1150 } else {
1151 pace->perms = unix_perms_to_acl_perms(pst->st_mode, S_IRGRP, S_IWGRP, S_IXGRP);
1152 }
1153
1154 DLIST_ADD(*pp_ace, pace);
1155 }
1156
1157 if (!got_other) {
1158 if ((pace = SMB_MALLOC_P(canon_ace)) == NULL) {
1159 DEBUG(0,("ensure_canon_entry_valid: malloc fail.\n"));
1160 return False;
1161 }
1162
1163 ZERO_STRUCTP(pace);
1164 pace->type = SMB_ACL_OTHER;
1165 pace->owner_type = WORLD_ACE;
1166 pace->unix_ug.world = -1;
1167 pace->trustee = global_sid_World;
1168 pace->attr = ALLOW_ACE;
1169 if (setting_acl) {
1170 pace->perms = 0;
1171 apply_default_perms(fsp, pace, S_IROTH);
1172 } else
1173 pace->perms = unix_perms_to_acl_perms(pst->st_mode, S_IROTH, S_IWOTH, S_IXOTH);
1174
1175 DLIST_ADD(*pp_ace, pace);
1176 }
1177
1178 return True;
1179 }
1180
1181 /****************************************************************************
1182 Check if a POSIX ACL has the required SMB_ACL_USER_OBJ and SMB_ACL_GROUP_OBJ entries.
1183 If it does not have them, check if there are any entries where the trustee is the
1184 file owner or the owning group, and map these to SMB_ACL_USER_OBJ and SMB_ACL_GROUP_OBJ.
1185 ****************************************************************************/
1186
1187 static void check_owning_objs(canon_ace *ace, DOM_SID *pfile_owner_sid, DOM_SID *pfile_grp_sid)
1188 {
1189 BOOL got_user_obj, got_group_obj;
1190 canon_ace *current_ace;
1191 int i, entries;
1192
1193 entries = count_canon_ace_list(ace);
1194 got_user_obj = False;
1195 got_group_obj = False;
1196
1197 for (i=0, current_ace = ace; i < entries; i++, current_ace = current_ace->next) {
1198 if (current_ace->type == SMB_ACL_USER_OBJ)
1199 got_user_obj = True;
1200 else if (current_ace->type == SMB_ACL_GROUP_OBJ)
1201 got_group_obj = True;
1202 }
1203 if (got_user_obj && got_group_obj) {
1204 DEBUG(10,("check_owning_objs: ACL had owning user/group entries.\n"));
1205 return;
1206 }
1207
1208 for (i=0, current_ace = ace; i < entries; i++, current_ace = current_ace->next) {
1209 if (!got_user_obj && current_ace->owner_type == UID_ACE &&
1210 sid_equal(&current_ace->trustee, pfile_owner_sid)) {
1211 current_ace->type = SMB_ACL_USER_OBJ;
1212 got_user_obj = True;
1213 }
1214 if (!got_group_obj && current_ace->owner_type == GID_ACE &&
1215 sid_equal(&current_ace->trustee, pfile_grp_sid)) {
1216 current_ace->type = SMB_ACL_GROUP_OBJ;
1217 got_group_obj = True;
1218 }
1219 }
1220 if (!got_user_obj)
1221 DEBUG(10,("check_owning_objs: ACL is missing an owner entry.\n"));
1222 if (!got_group_obj)
1223 DEBUG(10,("check_owning_objs: ACL is missing an owning group entry.\n"));
1224 }
1225
1226 /****************************************************************************
1227 Unpack a SEC_DESC into two canonical ace lists.
1228 ****************************************************************************/
1229
1230 static BOOL create_canon_ace_lists(files_struct *fsp, SMB_STRUCT_STAT *pst,
1231 DOM_SID *pfile_owner_sid,
1232 DOM_SID *pfile_grp_sid,
1233 canon_ace **ppfile_ace, canon_ace **ppdir_ace,
1234 SEC_ACL *dacl)
1235 {
1236 BOOL all_aces_are_inherit_only = (fsp->is_directory ? True : False);
1237 canon_ace *file_ace = NULL;
1238 canon_ace *dir_ace = NULL;
1239 canon_ace *tmp_ace = NULL;
1240 canon_ace *current_ace = NULL;
1241 BOOL got_dir_allow = False;
1242 BOOL got_file_allow = False;
1243 int i, j;
1244
1245 *ppfile_ace = NULL;
1246 *ppdir_ace = NULL;
1247
1248 /*
1249 * Convert the incoming ACL into a more regular form.
1250 */
1251
1252 for(i = 0; i < dacl->num_aces; i++) {
1253 SEC_ACE *psa = &dacl->ace[i];
1254
1255 if((psa->type != SEC_ACE_TYPE_ACCESS_ALLOWED) && (psa->type != SEC_ACE_TYPE_ACCESS_DENIED)) {
1256 DEBUG(3,("create_canon_ace_lists: unable to set anything but an ALLOW or DENY ACE.\n"));
1257 return False;
1258 }
1259
1260 if (nt4_compatible_acls()) {
1261 /*
1262 * The security mask may be UNIX_ACCESS_NONE which should map into
1263 * no permissions (we overload the WRITE_OWNER bit for this) or it
1264 * should be one of the ALL/EXECUTE/READ/WRITE bits. Arrange for this
1265 * to be so. Any other bits override the UNIX_ACCESS_NONE bit.
1266 */
1267
1268 /*
1269 * Convert GENERIC bits to specific bits.
1270 */
1271
1272 se_map_generic(&psa->info.mask, &file_generic_mapping);
1273
1274 psa->info.mask &= (UNIX_ACCESS_NONE|FILE_ALL_ACCESS);
1275
1276 if(psa->info.mask != UNIX_ACCESS_NONE)
1277 psa->info.mask &= ~UNIX_ACCESS_NONE;
1278 }
1279 }
1280
1281 /*
1282 * Deal with the fact that NT 4.x re-writes the canonical format
1283 * that we return for default ACLs. If a directory ACE is identical
1284 * to a inherited directory ACE then NT changes the bits so that the
1285 * first ACE is set to OI|IO and the second ACE for this SID is set
1286 * to CI. We need to repair this. JRA.
1287 */
1288
1289 for(i = 0; i < dacl->num_aces; i++) {
1290 SEC_ACE *psa1 = &dacl->ace[i];
1291
1292 for (j = i + 1; j < dacl->num_aces; j++) {
1293 SEC_ACE *psa2 = &dacl->ace[j];
1294
1295 if (psa1->info.mask != psa2->info.mask)
1296 continue;
1297
1298 if (!sid_equal(&psa1->trustee, &psa2->trustee))
1299 continue;
1300
1301 /*
1302 * Ok - permission bits and SIDs are equal.
1303 * Check if flags were re-written.
1304 */
1305
1306 if (psa1->flags & SEC_ACE_FLAG_INHERIT_ONLY) {
1307
1308 psa1->flags |= (psa2->flags & (SEC_ACE_FLAG_CONTAINER_INHERIT|SEC_ACE_FLAG_OBJECT_INHERIT));
1309 psa2->flags &= ~(SEC_ACE_FLAG_CONTAINER_INHERIT|SEC_ACE_FLAG_OBJECT_INHERIT);
1310
1311 } else if (psa2->flags & SEC_ACE_FLAG_INHERIT_ONLY) {
1312
1313 psa2->flags |= (psa1->flags & (SEC_ACE_FLAG_CONTAINER_INHERIT|SEC_ACE_FLAG_OBJECT_INHERIT));
1314 psa1->flags &= ~(SEC_ACE_FLAG_CONTAINER_INHERIT|SEC_ACE_FLAG_OBJECT_INHERIT);
1315
1316 }
1317 }
1318 }
1319
1320 for(i = 0; i < dacl->num_aces; i++) {
1321 SEC_ACE *psa = &dacl->ace[i];
1322
1323 /*
1324 * Ignore non-mappable SIDs (NT Authority, BUILTIN etc).
1325 */
1326
1327 if (non_mappable_sid(&psa->trustee)) {
1328 fstring str;
1329 DEBUG(10,("create_canon_ace_lists: ignoring non-mappable SID %s\n",
1330 sid_to_string(str, &psa->trustee) ));
1331 continue;
1332 }
1333
1334 /*
1335 * Create a cannon_ace entry representing this NT DACL ACE.
1336 */
1337
1338 if ((current_ace = SMB_MALLOC_P(canon_ace)) == NULL) {
1339 free_canon_ace_list(file_ace);
1340 free_canon_ace_list(dir_ace);
1341 DEBUG(0,("create_canon_ace_lists: malloc fail.\n"));
1342 return False;
1343 }
1344
1345 ZERO_STRUCTP(current_ace);
1346
1347 sid_copy(&current_ace->trustee, &psa->trustee);
1348
1349 /*
1350 * Try and work out if the SID is a user or group
1351 * as we need to flag these differently for POSIX.
1352 * Note what kind of a POSIX ACL this should map to.
1353 */
1354
1355 if( sid_equal(&current_ace->trustee, &global_sid_World)) {
1356 current_ace->owner_type = WORLD_ACE;
1357 current_ace->unix_ug.world = -1;
1358 current_ace->type = SMB_ACL_OTHER;
1359 } else if (sid_equal(&current_ace->trustee, &global_sid_Creator_Owner)) {
1360 current_ace->owner_type = UID_ACE;
1361 current_ace->unix_ug.uid = pst->st_uid;
1362 current_ace->type = SMB_ACL_USER_OBJ;
1363
1364 /*
1365 * The Creator Owner entry only specifies inheritable permissions,
1366 * never access permissions. WinNT doesn't always set the ACE to
1367 *INHERIT_ONLY, though.
1368 */
1369
1370 if (nt4_compatible_acls())
1371 psa->flags |= SEC_ACE_FLAG_INHERIT_ONLY;
1372 } else if (sid_equal(&current_ace->trustee, &global_sid_Creator_Group)) {
1373 current_ace->owner_type = GID_ACE;
1374 current_ace->unix_ug.gid = pst->st_gid;
1375 current_ace->type = SMB_ACL_GROUP_OBJ;
1376
1377 /*
1378 * The Creator Group entry only specifies inheritable permissions,
1379 * never access permissions. WinNT doesn't always set the ACE to
1380 *INHERIT_ONLY, though.
1381 */
1382 if (nt4_compatible_acls())
1383 psa->flags |= SEC_ACE_FLAG_INHERIT_ONLY;
1384
1385 } else if (sid_to_uid( &current_ace->trustee, &current_ace->unix_ug.uid)) {
1386 current_ace->owner_type = UID_ACE;
1387 current_ace->type = SMB_ACL_USER;
1388 } else if (sid_to_gid( &current_ace->trustee, &current_ace->unix_ug.gid)) {
1389 current_ace->owner_type = GID_ACE;
1390 current_ace->type = SMB_ACL_GROUP;
1391 } else {
1392 fstring str;
1393
1394 free_canon_ace_list(file_ace);
1395 free_canon_ace_list(dir_ace);
1396 DEBUG(0,("create_canon_ace_lists: unable to map SID %s to uid or gid.\n",
1397 sid_to_string(str, &current_ace->trustee) ));
1398 SAFE_FREE(current_ace);
1399 return False;
1400 }
1401
1402 /*
1403 * Map the given NT permissions into a UNIX mode_t containing only
1404 * S_I(R|W|X)USR bits.
1405 */
1406
1407 current_ace->perms |= map_nt_perms( psa->info, S_IRUSR);
1408 current_ace->attr = (psa->type == SEC_ACE_TYPE_ACCESS_ALLOWED) ? ALLOW_ACE : DENY_ACE;
1409 current_ace->inherited = ((psa->flags & SEC_ACE_FLAG_INHERITED_ACE) ? True : False);
1410
1411 /*
1412 * Now add the created ace to either the file list, the directory
1413 * list, or both. We *MUST* preserve the order here (hence we use
1414 * DLIST_ADD_END) as NT ACLs are order dependent.
1415 */
1416
1417 if (fsp->is_directory) {
1418
1419 /*
1420 * We can only add to the default POSIX ACE list if the ACE is
1421 * designed to be inherited by both files and directories.
1422 */
1423
1424 if ((psa->flags & (SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT)) ==
1425 (SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT)) {
1426
1427 DLIST_ADD_END(dir_ace, current_ace, tmp_ace);
1428
1429 /*
1430 * Note if this was an allow ace. We can't process
1431 * any further deny ace's after this.
1432 */
1433
1434 if (current_ace->attr == ALLOW_ACE)
1435 got_dir_allow = True;
1436
1437 if ((current_ace->attr == DENY_ACE) && got_dir_allow) {
1438 DEBUG(0,("create_canon_ace_lists: malformed ACL in inheritable ACL ! \
1439 Deny entry after Allow entry. Failing to set on file %s.\n", fsp->fsp_name ));
1440 free_canon_ace_list(file_ace);
1441 free_canon_ace_list(dir_ace);
1442 return False;
1443 }
1444
1445 if( DEBUGLVL( 10 )) {
1446 dbgtext("create_canon_ace_lists: adding dir ACL:\n");
1447 print_canon_ace( current_ace, 0);
1448 }
1449
1450 /*
1451 * If this is not an inherit only ACE we need to add a duplicate
1452 * to the file acl.
1453 */
1454
1455 if (!(psa->flags & SEC_ACE_FLAG_INHERIT_ONLY)) {
1456 canon_ace *dup_ace = dup_canon_ace(current_ace);
1457
1458 if (!dup_ace) {
1459 DEBUG(0,("create_canon_ace_lists: malloc fail !\n"));
1460 free_canon_ace_list(file_ace);
1461 free_canon_ace_list(dir_ace);
1462 return False;
1463 }
1464
1465 /*
1466 * We must not free current_ace here as its
1467 * pointer is now owned by the dir_ace list.
1468 */
1469 current_ace = dup_ace;
1470 } else {
1471 /*
1472 * We must not free current_ace here as its
1473 * pointer is now owned by the dir_ace list.
1474 */
1475 current_ace = NULL;
1476 }
1477 }
1478 }
1479
1480 /*
1481 * Only add to the file ACL if not inherit only.
1482 */
1483
1484 if (!(psa->flags & SEC_ACE_FLAG_INHERIT_ONLY)) {
1485 DLIST_ADD_END(file_ace, current_ace, tmp_ace);
1486
1487 /*
1488 * Note if this was an allow ace. We can't process
1489 * any further deny ace's after this.
1490 */
1491
1492 if (current_ace->attr == ALLOW_ACE)
1493 got_file_allow = True;
1494
1495 if ((current_ace->attr == DENY_ACE) && got_file_allow) {
1496 DEBUG(0,("create_canon_ace_lists: malformed ACL in file ACL ! \
1497 Deny entry after Allow entry. Failing to set on file %s.\n", fsp->fsp_name ));
1498 free_canon_ace_list(file_ace);
1499 free_canon_ace_list(dir_ace);
1500 return False;
1501 }
1502
1503 if( DEBUGLVL( 10 )) {
1504 dbgtext("create_canon_ace_lists: adding file ACL:\n");
1505 print_canon_ace( current_ace, 0);
1506 }
1507 all_aces_are_inherit_only = False;
1508 /*
1509 * We must not free current_ace here as its
1510 * pointer is now owned by the file_ace list.
1511 */
1512 current_ace = NULL;
1513 }
1514
1515 /*
1516 * Free if ACE was not added.
1517 */
1518
1519 SAFE_FREE(current_ace);
1520 }
1521
1522 if (fsp->is_directory && all_aces_are_inherit_only) {
1523 /*
1524 * Windows 2000 is doing one of these weird 'inherit acl'
1525 * traverses to conserve NTFS ACL resources. Just pretend
1526 * there was no DACL sent. JRA.
1527 */
1528
1529 DEBUG(10,("create_canon_ace_lists: Win2k inherit acl traverse. Ignoring DACL.\n"));
1530 free_canon_ace_list(file_ace);
1531 free_canon_ace_list(dir_ace);
1532 file_ace = NULL;
1533 dir_ace = NULL;
1534 } else {
1535 /*
1536 * Check if we have SMB_ACL_USER_OBJ and SMB_ACL_GROUP_OBJ entries in each
1537 * ACL. If we don't have them, check if any SMB_ACL_USER/SMB_ACL_GROUP
1538 * entries can be converted to *_OBJ. Usually we will already have these
1539 * entries in the Default ACL, and the Access ACL will not have them.
1540 */
1541 if (file_ace) {
1542 check_owning_objs(file_ace, pfile_owner_sid, pfile_grp_sid);
1543 }
1544 if (dir_ace) {
1545 check_owning_objs(dir_ace, pfile_owner_sid, pfile_grp_sid);
1546 }
1547 }
1548
1549 *ppfile_ace = file_ace;
1550 *ppdir_ace = dir_ace;
1551
1552 return True;
1553 }
1554
1555 /****************************************************************************
1556 ASCII art time again... JRA :-).
1557
1558 We have 4 cases to process when moving from an NT ACL to a POSIX ACL. Firstly,
1559 we insist the ACL is in canonical form (ie. all DENY entries preceede ALLOW
1560 entries). Secondly, the merge code has ensured that all duplicate SID entries for
1561 allow or deny have been merged, so the same SID can only appear once in the deny
1562 list or once in the allow list.
1563
1564 We then process as follows :
1565
1566 ---------------------------------------------------------------------------
1567 First pass - look for a Everyone DENY entry.
1568
1569 If it is deny all (rwx) trunate the list at this point.
1570 Else, walk the list from this point and use the deny permissions of this
1571 entry as a mask on all following allow entries. Finally, delete
1572 the Everyone DENY entry (we have applied it to everything possible).
1573
1574 In addition, in this pass we remove any DENY entries that have
1575 no permissions (ie. they are a DENY nothing).
1576 ---------------------------------------------------------------------------
1577 Second pass - only deal with deny user entries.
1578
1579 DENY user1 (perms XXX)
1580
1581 new_perms = 0
1582 for all following allow group entries where user1 is in group
1583 new_perms |= group_perms;
1584
1585 user1 entry perms = new_perms & ~ XXX;
1586
1587 Convert the deny entry to an allow entry with the new perms and
1588 push to the end of the list. Note if the user was in no groups
1589 this maps to a specific allow nothing entry for this user.
1590
1591 The common case from the NT ACL choser (userX deny all) is
1592 optimised so we don't do the group lookup - we just map to
1593 an allow nothing entry.
1594
1595 What we're doing here is inferring the allow permissions the
1596 person setting the ACE on user1 wanted by looking at the allow
1597 permissions on the groups the user is currently in. This will
1598 be a snapshot, depending on group membership but is the best
1599 we can do and has the advantage of failing closed rather than
1600 open.
1601 ---------------------------------------------------------------------------
1602 Third pass - only deal with deny group entries.
1603
1604 DENY group1 (perms XXX)
1605
1606 for all following allow user entries where user is in group1
1607 user entry perms = user entry perms & ~ XXX;
1608
1609 If there is a group Everyone allow entry with permissions YYY,
1610 convert the group1 entry to an allow entry and modify its
1611 permissions to be :
1612
1613 new_perms = YYY & ~ XXX
1614
1615 and push to the end of the list.
1616
1617 If there is no group Everyone allow entry then convert the
1618 group1 entry to a allow nothing entry and push to the end of the list.
1619
1620 Note that the common case from the NT ACL choser (groupX deny all)
1621 cannot be optimised here as we need to modify user entries who are
1622 in the group to change them to a deny all also.
1623
1624 What we're doing here is modifying the allow permissions of
1625 user entries (which are more specific in POSIX ACLs) to mask
1626 out the explicit deny set on the group they are in. This will
1627 be a snapshot depending on current group membership but is the
1628 best we can do and has the advantage of failing closed rather
1629 than open.
1630 ---------------------------------------------------------------------------
1631 Fourth pass - cope with cumulative permissions.
1632
1633 for all allow user entries, if there exists an allow group entry with
1634 more permissive permissions, and the user is in that group, rewrite the
1635 allow user permissions to contain both sets of permissions.
1636
1637 Currently the code for this is #ifdef'ed out as these semantics make
1638 no sense to me. JRA.
1639 ---------------------------------------------------------------------------
1640
1641 Note we *MUST* do the deny user pass first as this will convert deny user
1642 entries into allow user entries which can then be processed by the deny
1643 group pass.
1644
1645 The above algorithm took a *lot* of thinking about - hence this
1646 explaination :-). JRA.
1647 ****************************************************************************/
1648
1649 /****************************************************************************
1650 Process a canon_ace list entries. This is very complex code. We need
1651 to go through and remove the "deny" permissions from any allow entry that matches
1652 the id of this entry. We have already refused any NT ACL that wasn't in correct
1653 order (DENY followed by ALLOW). If any allow entry ends up with zero permissions,
1654 we just remove it (to fail safe). We have already removed any duplicate ace
1655 entries. Treat an "Everyone" DENY_ACE as a special case - use it to mask all
1656 allow entries.
1657 ****************************************************************************/
1658
1659 static void process_deny_list( canon_ace **pp_ace_list )
1660 {
1661 canon_ace *ace_list = *pp_ace_list;
1662 canon_ace *curr_ace = NULL;
1663 canon_ace *curr_ace_next = NULL;
1664
1665 /* Pass 1 above - look for an Everyone, deny entry. */
1666
1667 for (curr_ace = ace_list; curr_ace; curr_ace = curr_ace_next) {
1668 canon_ace *allow_ace_p;
1669
1670 curr_ace_next = curr_ace->next; /* So we can't lose the link. */
1671
1672 if (curr_ace->attr != DENY_ACE)
1673 continue;
1674
1675 if (curr_ace->perms == (mode_t)0) {
1676
1677 /* Deny nothing entry - delete. */
1678
1679 DLIST_REMOVE(ace_list, curr_ace);
1680 continue;
1681 }
1682
1683 if (!sid_equal(&curr_ace->trustee, &global_sid_World))
1684 continue;
1685
1686 /* JRATEST - assert. */
1687 SMB_ASSERT(curr_ace->owner_type == WORLD_ACE);
1688
1689 if (curr_ace->perms == ALL_ACE_PERMS) {
1690
1691 /*
1692 * Optimisation. This is a DENY_ALL to Everyone. Truncate the
1693 * list at this point including this entry.
1694 */
1695
1696 canon_ace *prev_entry = curr_ace->prev;
1697
1698 free_canon_ace_list( curr_ace );
1699 if (prev_entry)
1700 prev_entry->next = NULL;
1701 else {
1702 /* We deleted the entire list. */
1703 ace_list = NULL;
1704 }
1705 break;
1706 }
1707
1708 for (allow_ace_p = curr_ace->next; allow_ace_p; allow_ace_p = allow_ace_p->next) {
1709
1710 /*
1711 * Only mask off allow entries.
1712 */
1713
1714 if (allow_ace_p->attr != ALLOW_ACE)
1715 continue;
1716
1717 allow_ace_p->perms &= ~curr_ace->perms;
1718 }
1719
1720 /*
1721 * Now it's been applied, remove it.
1722 */
1723
1724 DLIST_REMOVE(ace_list, curr_ace);
1725 }
1726
1727 /* Pass 2 above - deal with deny user entries. */
1728
1729 for (curr_ace = ace_list; curr_ace; curr_ace = curr_ace_next) {
1730 mode_t new_perms = (mode_t)0;
1731 canon_ace *allow_ace_p;
1732 canon_ace *tmp_ace;
1733
1734 curr_ace_next = curr_ace->next; /* So we can't lose the link. */
1735
1736 if (curr_ace->attr != DENY_ACE)
1737 continue;
1738
1739 if (curr_ace->owner_type != UID_ACE)
1740 continue;
1741
1742 if (curr_ace->perms == ALL_ACE_PERMS) {
1743
1744 /*
1745 * Optimisation - this is a deny everything to this user.
1746 * Convert to an allow nothing and push to the end of the list.
1747 */
1748
1749 curr_ace->attr = ALLOW_ACE;
1750 curr_ace->perms = (mode_t)0;
1751 DLIST_DEMOTE(ace_list, curr_ace, tmp_ace);
1752 continue;
1753 }
1754
1755 for (allow_ace_p = curr_ace->next; allow_ace_p; allow_ace_p = allow_ace_p->next) {
1756
1757 if (allow_ace_p->attr != ALLOW_ACE)
1758 continue;
1759
1760 /* We process GID_ACE and WORLD_ACE entries only. */
1761
1762 if (allow_ace_p->owner_type == UID_ACE)
1763 continue;
1764
1765 if (uid_entry_in_group( curr_ace, allow_ace_p))
1766 new_perms |= allow_ace_p->perms;
1767 }
1768
1769 /*
1770 * Convert to a allow entry, modify the perms and push to the end
1771 * of the list.
1772 */
1773
1774 curr_ace->attr = ALLOW_ACE;
1775 curr_ace->perms = (new_perms & ~curr_ace->perms);
1776 DLIST_DEMOTE(ace_list, curr_ace, tmp_ace);
1777 }
1778
1779 /* Pass 3 above - deal with deny group entries. */
1780
1781 for (curr_ace = ace_list; curr_ace; curr_ace = curr_ace_next) {
1782 canon_ace *tmp_ace;
1783 canon_ace *allow_ace_p;
1784 canon_ace *allow_everyone_p = NULL;
1785
1786 curr_ace_next = curr_ace->next; /* So we can't lose the link. */
1787
1788 if (curr_ace->attr != DENY_ACE)
1789 continue;
1790
1791 if (curr_ace->owner_type != GID_ACE)
1792 continue;
1793
1794 for (allow_ace_p = curr_ace->next; allow_ace_p; allow_ace_p = allow_ace_p->next) {
1795
1796 if (allow_ace_p->attr != ALLOW_ACE)
1797 continue;
1798
1799 /* Store a pointer to the Everyone allow, if it exists. */
1800 if (allow_ace_p->owner_type == WORLD_ACE)
1801 allow_everyone_p = allow_ace_p;
1802
1803 /* We process UID_ACE entries only. */
1804
1805 if (allow_ace_p->owner_type != UID_ACE)
1806 continue;
1807
1808 /* Mask off the deny group perms. */
1809
1810 if (uid_entry_in_group( allow_ace_p, curr_ace))
1811 allow_ace_p->perms &= ~curr_ace->perms;
1812 }
1813
1814 /*
1815 * Convert the deny to an allow with the correct perms and
1816 * push to the end of the list.
1817 */
1818
1819 curr_ace->attr = ALLOW_ACE;
1820 if (allow_everyone_p)
1821 curr_ace->perms = allow_everyone_p->perms & ~curr_ace->perms;
1822 else
1823 curr_ace->perms = (mode_t)0;
1824 DLIST_DEMOTE(ace_list, curr_ace, tmp_ace);
1825
1826 }
1827
1828 /* Doing this fourth pass allows Windows semantics to be layered
1829 * on top of POSIX semantics. I'm not sure if this is desirable.
1830 * For example, in W2K ACLs there is no way to say, "Group X no
1831 * access, user Y full access" if user Y is a member of group X.
1832 * This seems completely broken semantics to me.... JRA.
1833 */
1834
1835 #if 0
1836 /* Pass 4 above - deal with allow entries. */
1837
1838 for (curr_ace = ace_list; curr_ace; curr_ace = curr_ace_next) {
1839 canon_ace *allow_ace_p;
1840
1841 curr_ace_next = curr_ace->next; /* So we can't lose the link. */
1842
1843 if (curr_ace->attr != ALLOW_ACE)
1844 continue;
1845
1846 if (curr_ace->owner_type != UID_ACE)
1847 continue;
1848
1849 for (allow_ace_p = ace_list; allow_ace_p; allow_ace_p = allow_ace_p->next) {
1850
1851 if (allow_ace_p->attr != ALLOW_ACE)
1852 continue;
1853
1854 /* We process GID_ACE entries only. */
1855
1856 if (allow_ace_p->owner_type != GID_ACE)
1857 continue;
1858
1859 /* OR in the group perms. */
1860
1861 if (uid_entry_in_group( curr_ace, allow_ace_p))
1862 curr_ace->perms |= allow_ace_p->perms;
1863 }
1864 }
1865 #endif
1866
1867 *pp_ace_list = ace_list;
1868 }
1869
1870 /****************************************************************************
1871 Create a default mode that will be used if a security descriptor entry has
1872 no user/group/world entries.
1873 ****************************************************************************/
1874
1875 static mode_t create_default_mode(files_struct *fsp, BOOL interitable_mode)
1876 {
1877 int snum = SNUM(fsp->conn);
1878 mode_t and_bits = (mode_t)0;
1879 mode_t or_bits = (mode_t)0;
1880 mode_t mode = interitable_mode ? unix_mode( fsp->conn, FILE_ATTRIBUTE_ARCHIVE, fsp->fsp_name, False) : S_IRUSR;
1881
1882 if (fsp->is_directory)
1883 mode |= (S_IWUSR|S_IXUSR);
1884
1885 /*
1886 * Now AND with the create mode/directory mode bits then OR with the
1887 * force create mode/force directory mode bits.
1888 */
1889
1890 if (fsp->is_directory) {
1891 and_bits = lp_dir_security_mask(snum);
1892 or_bits = lp_force_dir_security_mode(snum);
1893 } else {
1894 and_bits = lp_security_mask(snum);
1895 or_bits = lp_force_security_mode(snum);
1896 }
1897
1898 return ((mode & and_bits)|or_bits);
1899 }
1900
1901 /****************************************************************************
1902 Unpack a SEC_DESC into two canonical ace lists. We don't depend on this
1903 succeeding.
1904 ****************************************************************************/
1905
1906 static BOOL unpack_canon_ace(files_struct *fsp,
1907 SMB_STRUCT_STAT *pst,
1908 DOM_SID *pfile_owner_sid,
1909 DOM_SID *pfile_grp_sid,
1910 canon_ace **ppfile_ace, canon_ace **ppdir_ace,
1911 uint32 security_info_sent, SEC_DESC *psd)
1912 {
1913 canon_ace *file_ace = NULL;
1914 canon_ace *dir_ace = NULL;
1915
1916 *ppfile_ace = NULL;
1917 *ppdir_ace = NULL;
1918
1919 if(security_info_sent == 0) {
1920 DEBUG(0,("unpack_canon_ace: no security info sent !\n"));
1921 return False;
1922 }
1923
1924 /*
1925 * If no DACL then this is a chown only security descriptor.
1926 */
1927
1928 if(!(security_info_sent & DACL_SECURITY_INFORMATION) || !psd->dacl)
1929 return True;
1930
1931 /*
1932 * Now go through the DACL and create the canon_ace lists.
1933 */
1934
1935 if (!create_canon_ace_lists( fsp, pst, pfile_owner_sid, pfile_grp_sid,
1936 &file_ace, &dir_ace, psd->dacl))
1937 return False;
1938
1939 if ((file_ace == NULL) && (dir_ace == NULL)) {
1940 /* W2K traverse DACL set - ignore. */
1941 return True;
1942 }
1943
1944 /*
1945 * Go through the canon_ace list and merge entries
1946 * belonging to identical users of identical allow or deny type.
1947 * We can do this as all deny entries come first, followed by
1948 * all allow entries (we have mandated this before accepting this acl).
1949 */
1950
1951 print_canon_ace_list( "file ace - before merge", file_ace);
1952 merge_aces( &file_ace );
1953
1954 print_canon_ace_list( "dir ace - before merge", dir_ace);
1955 merge_aces( &dir_ace );
1956
1957 /*
1958 * NT ACLs are order dependent. Go through the acl lists and
1959 * process DENY entries by masking the allow entries.
1960 */
1961
1962 print_canon_ace_list( "file ace - before deny", file_ace);
1963 process_deny_list( &file_ace);
1964
1965 print_canon_ace_list( "dir ace - before deny", dir_ace);
1966 process_deny_list( &dir_ace);
1967
1968 /*
1969 * A well formed POSIX file or default ACL has at least 3 entries, a
1970 * SMB_ACL_USER_OBJ, SMB_ACL_GROUP_OBJ, SMB_ACL_OTHER_OBJ
1971 * and optionally a mask entry. Ensure this is the case.
1972 */
1973
1974 print_canon_ace_list( "file ace - before valid", file_ace);
1975
1976 /*
1977 * A default 3 element mode entry for a file should be r-- --- ---.
1978 * A default 3 element mode entry for a directory should be rwx --- ---.
1979 */
1980
1981 pst->st_mode = create_default_mode(fsp, False);
1982
1983 if (!ensure_canon_entry_valid(&file_ace, fsp, pfile_owner_sid, pfile_grp_sid, pst, True)) {
1984 free_canon_ace_list(file_ace);
1985 free_canon_ace_list(dir_ace);
1986 return False;
1987 }
1988
1989 print_canon_ace_list( "dir ace - before valid", dir_ace);
1990
1991 /*
1992 * A default inheritable 3 element mode entry for a directory should be the
1993 * mode Samba will use to create a file within. Ensure user rwx bits are set if
1994 * it's a directory.
1995 */
1996
1997 pst->st_mode = create_default_mode(fsp, True);
1998
1999 if (dir_ace && !ensure_canon_entry_valid(&dir_ace, fsp, pfile_owner_sid, pfile_grp_sid, pst, True)) {
2000 free_canon_ace_list(file_ace);
2001 free_canon_ace_list(dir_ace);
2002 return False;
2003 }
2004
2005 print_canon_ace_list( "file ace - return", file_ace);
2006 print_canon_ace_list( "dir ace - return", dir_ace);
2007
2008 *ppfile_ace = file_ace;
2009 *ppdir_ace = dir_ace;
2010 return True;
2011
2012 }
2013
2014 /******************************************************************************
2015 When returning permissions, try and fit NT display
2016 semantics if possible. Note the the canon_entries here must have been malloced.
2017 The list format should be - first entry = owner, followed by group and other user
2018 entries, last entry = other.
2019
2020 Note that this doesn't exactly match the NT semantics for an ACL. As POSIX entries
2021 are not ordered, and match on the most specific entry rather than walking a list,
2022 then a simple POSIX permission of rw-r--r-- should really map to 5 entries,
2023
2024 Entry 0: owner : deny all except read and write.
2025 Entry 1: owner : allow read and write.
2026 Entry 2: group : deny all except read.
2027 Entry 3: group : allow read.
2028 Entry 4: Everyone : allow read.
2029
2030 But NT cannot display this in their ACL editor !
2031 ********************************************************************************/
2032
2033 static void arrange_posix_perms( char *filename, canon_ace **pp_list_head)
2034 {
2035 canon_ace *list_head = *pp_list_head;
2036 canon_ace *owner_ace = NULL;
2037 canon_ace *other_ace = NULL;
2038 canon_ace *ace = NULL;
2039
2040 for (ace = list_head; ace; ace = ace->next) {
2041 if (ace->type == SMB_ACL_USER_OBJ)
2042 owner_ace = ace;
2043 else if (ace->type == SMB_ACL_OTHER) {
2044 /* Last ace - this is "other" */
2045 other_ace = ace;
2046 }
2047 }
2048
2049 if (!owner_ace || !other_ace) {
2050 DEBUG(0,("arrange_posix_perms: Invalid POSIX permissions for file %s, missing owner or other.\n",
2051 filename ));
2052 return;
2053 }
2054
2055 /*
2056 * The POSIX algorithm applies to owner first, and other last,
2057 * so ensure they are arranged in this order.
2058 */
2059
2060 if (owner_ace) {
2061 DLIST_PROMOTE(list_head, owner_ace);
2062 }
2063
2064 if (other_ace) {
2065 DLIST_DEMOTE(list_head, other_ace, ace);
2066 }
2067
2068 /* We have probably changed the head of the list. */
2069
2070 *pp_list_head = list_head;
2071 }
2072
2073 /****************************************************************************
2074 Create a linked list of canonical ACE entries.
2075 ****************************************************************************/
2076
2077 static canon_ace *canonicalise_acl( files_struct *fsp, SMB_ACL_T posix_acl, SMB_STRUCT_STAT *psbuf,
2078 const DOM_SID *powner, const DOM_SID *pgroup, struct pai_val *pal, SMB_ACL_TYPE_T the_acl_type)
2079 {
2080 connection_struct *conn = fsp->conn;
2081 mode_t acl_mask = (S_IRUSR|S_IWUSR|S_IXUSR);
2082 canon_ace *list_head = NULL;
2083 canon_ace *ace = NULL;
2084 canon_ace *next_ace = NULL;
2085 int entry_id = SMB_ACL_FIRST_ENTRY;
2086 SMB_ACL_ENTRY_T entry;
2087 size_t ace_count;
2088
2089 while ( posix_acl && (SMB_VFS_SYS_ACL_GET_ENTRY(conn, posix_acl, entry_id, &entry) == 1)) {
2090 SMB_ACL_TAG_T tagtype;
2091 SMB_ACL_PERMSET_T permset;
2092 DOM_SID sid;
2093 posix_id unix_ug;
2094 enum ace_owner owner_type;
2095
2096 /* get_next... */
2097 if (entry_id == SMB_ACL_FIRST_ENTRY)
2098 entry_id = SMB_ACL_NEXT_ENTRY;
2099
2100 /* Is this a MASK entry ? */
2101 if (SMB_VFS_SYS_ACL_GET_TAG_TYPE(conn, entry, &tagtype) == -1)
2102 continue;
2103
2104 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, entry, &permset) == -1)
2105 continue;
2106
2107 /* Decide which SID to use based on the ACL type. */
2108 switch(tagtype) {
2109 case SMB_ACL_USER_OBJ:
2110 /* Get the SID from the owner. */
2111 sid_copy(&sid, powner);
2112 unix_ug.uid = psbuf->st_uid;
2113 owner_type = UID_ACE;
2114 break;
2115 case SMB_ACL_USER:
2116 {
2117 uid_t *puid = (uid_t *)SMB_VFS_SYS_ACL_GET_QUALIFIER(conn, entry);
2118 if (puid == NULL) {
2119 DEBUG(0,("canonicalise_acl: Failed to get uid.\n"));
2120 continue;
2121 }
2122 /*
2123 * A SMB_ACL_USER entry for the owner is shadowed by the
2124 * SMB_ACL_USER_OBJ entry and Windows also cannot represent
2125 * that entry, so we ignore it. We also don't create such
2126 * entries out of the blue when setting ACLs, so a get/set
2127 * cycle will drop them.
2128 */
2129 if (the_acl_type == SMB_ACL_TYPE_ACCESS && *puid == psbuf->st_uid) {
2130 SMB_VFS_SYS_ACL_FREE_QUALIFIER(conn, (void *)puid,tagtype);
2131 continue;
2132 }
2133 uid_to_sid( &sid, *puid);
2134 unix_ug.uid = *puid;
2135 owner_type = UID_ACE;
2136 SMB_VFS_SYS_ACL_FREE_QUALIFIER(conn, (void *)puid,tagtype);
2137 break;
2138 }
2139 case SMB_ACL_GROUP_OBJ:
2140 /* Get the SID from the owning group. */
2141 sid_copy(&sid, pgroup);
2142 unix_ug.gid = psbuf->st_gid;
2143 owner_type = GID_ACE;
2144 break;
2145 case SMB_ACL_GROUP:
2146 {
2147 gid_t *pgid = (gid_t *)SMB_VFS_SYS_ACL_GET_QUALIFIER(conn, entry);
2148 if (pgid == NULL) {
2149 DEBUG(0,("canonicalise_acl: Failed to get gid.\n"));
2150 continue;
2151 }
2152 gid_to_sid( &sid, *pgid);
2153 unix_ug.gid = *pgid;
2154 owner_type = GID_ACE;
2155 SMB_VFS_SYS_ACL_FREE_QUALIFIER(conn, (void *)pgid,tagtype);
2156 break;
2157 }
2158 case SMB_ACL_MASK:
2159 acl_mask = convert_permset_to_mode_t(conn, permset);
2160 continue; /* Don't count the mask as an entry. */
2161 case SMB_ACL_OTHER:
2162 /* Use the Everyone SID */
2163 sid = global_sid_World;
2164 unix_ug.world = -1;
2165 owner_type = WORLD_ACE;
2166 break;
2167 default:
2168 DEBUG(0,("canonicalise_acl: Unknown tagtype %u\n", (unsigned int)tagtype));
2169 continue;
2170 }
2171
2172 /*
2173 * Add this entry to the list.
2174 */
2175
2176 if ((ace = SMB_MALLOC_P(canon_ace)) == NULL)
2177 goto fail;
2178
2179 ZERO_STRUCTP(ace);
2180 ace->type = tagtype;
2181 ace->perms = convert_permset_to_mode_t(conn, permset);
2182 ace->attr = ALLOW_ACE;
2183 ace->trustee = sid;
2184 ace->unix_ug = unix_ug;
2185 ace->owner_type = owner_type;
2186 ace->inherited = get_inherited_flag(pal, ace, (the_acl_type == SMB_ACL_TYPE_DEFAULT));
2187
2188 DLIST_ADD(list_head, ace);
2189 }
2190
2191 /*
2192 * This next call will ensure we have at least a user/group/world set.
2193 */
2194
2195 if (!ensure_canon_entry_valid(&list_head, fsp, powner, pgroup, psbuf, False))
2196 goto fail;
2197
2198 /*
2199 * Now go through the list, masking the permissions with the
2200 * acl_mask. Ensure all DENY Entries are at the start of the list.
2201 */
2202
2203 DEBUG(10,("canonicalise_acl: %s ace entries before arrange :\n", the_acl_type == SMB_ACL_TYPE_ACCESS ? "Access" : "Default" ));
2204
2205 for ( ace_count = 0, ace = list_head; ace; ace = next_ace, ace_count++) {
2206 next_ace = ace->next;
2207
2208 /* Masks are only applied to entries other than USER_OBJ and OTHER. */
2209 if (ace->type != SMB_ACL_OTHER && ace->type != SMB_ACL_USER_OBJ)
2210 ace->perms &= acl_mask;
2211
2212 if (ace->perms == 0) {
2213 DLIST_PROMOTE(list_head, ace);
2214 }
2215
2216 if( DEBUGLVL( 10 ) ) {
2217 print_canon_ace(ace, ace_count);
2218 }
2219 }
2220
2221 arrange_posix_perms(fsp->fsp_name,&list_head );
2222
2223 print_canon_ace_list( "canonicalise_acl: ace entries after arrange", list_head );
2224
2225 return list_head;
2226
2227 fail:
2228
2229 free_canon_ace_list(list_head);
2230 return NULL;
2231 }
2232
2233 /****************************************************************************
2234 Check if the current user group list contains a given group.
2235 ****************************************************************************/
2236
2237 static BOOL current_user_in_group(gid_t gid)
2238 {
2239 int i;
2240
2241 for (i = 0; i < current_user.ut.ngroups; i++) {
2242 if (current_user.ut.groups[i] == gid) {
2243 return True;
2244 }
2245 }
2246
2247 return False;
2248 }
2249
2250 /****************************************************************************
2251 Should we override a deny ?
2252 ****************************************************************************/
2253
2254 static BOOL acl_group_override(connection_struct *conn, gid_t prim_gid)
2255 {
2256 if ((errno == EACCES || errno == EPERM) &&
2257 lp_acl_group_control(SNUM(conn)) &&
2258 current_user_in_group(prim_gid)) {
2259 return True;
2260 } else {
2261 return False;
2262 }
2263 }
2264
2265 /****************************************************************************
2266 Attempt to apply an ACL to a file or directory.
2267 ****************************************************************************/
2268
2269 static BOOL set_canon_ace_list(files_struct *fsp, canon_ace *the_ace, BOOL default_ace, gid_t prim_gid, BOOL *pacl_set_support)
2270 {
2271 connection_struct *conn = fsp->conn;
2272 BOOL ret = False;
2273 SMB_ACL_T the_acl = SMB_VFS_SYS_ACL_INIT(conn, (int)count_canon_ace_list(the_ace) + 1);
2274 canon_ace *p_ace;
2275 int i;
2276 SMB_ACL_ENTRY_T mask_entry;
2277 BOOL got_mask_entry = False;
2278 SMB_ACL_PERMSET_T mask_permset;
2279 SMB_ACL_TYPE_T the_acl_type = (default_ace ? SMB_ACL_TYPE_DEFAULT : SMB_ACL_TYPE_ACCESS);
2280 BOOL needs_mask = False;
2281 mode_t mask_perms = 0;
2282
2283 #if defined(POSIX_ACL_NEEDS_MASK)
2284 /* HP-UX always wants to have a mask (called "class" there). */
2285 needs_mask = True;
2286 #endif
2287
2288 if (the_acl == NULL) {
2289
2290 if (!no_acl_syscall_error(errno)) {
2291 /*
2292 * Only print this error message if we have some kind of ACL
2293 * support that's not working. Otherwise we would always get this.
2294 */
2295 DEBUG(0,("set_canon_ace_list: Unable to init %s ACL. (%s)\n",
2296 default_ace ? "default" : "file", strerror(errno) ));
2297 }
2298 *pacl_set_support = False;
2299 return False;
2300 }
2301
2302 if( DEBUGLVL( 10 )) {
2303 dbgtext("set_canon_ace_list: setting ACL:\n");
2304 for (i = 0, p_ace = the_ace; p_ace; p_ace = p_ace->next, i++ ) {
2305 print_canon_ace( p_ace, i);
2306 }
2307 }
2308
2309 for (i = 0, p_ace = the_ace; p_ace; p_ace = p_ace->next, i++ ) {
2310 SMB_ACL_ENTRY_T the_entry;
2311 SMB_ACL_PERMSET_T the_permset;
2312
2313 /*
2314 * ACLs only "need" an ACL_MASK entry if there are any named user or
2315 * named group entries. But if there is an ACL_MASK entry, it applies
2316 * to ACL_USER, ACL_GROUP, and ACL_GROUP_OBJ entries. Set the mask
2317 * so that it doesn't deny (i.e., mask off) any permissions.
2318 */
2319
2320 if (p_ace->type == SMB_ACL_USER || p_ace->type == SMB_ACL_GROUP) {
2321 needs_mask = True;
2322 mask_perms |= p_ace->perms;
2323 } else if (p_ace->type == SMB_ACL_GROUP_OBJ) {
2324 mask_perms |= p_ace->perms;
2325 }
2326
2327 /*
2328 * Get the entry for this ACE.
2329 */
2330
2331 if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &the_acl, &the_entry) == -1) {
2332 DEBUG(0,("set_canon_ace_list: Failed to create entry %d. (%s)\n",
2333 i, strerror(errno) ));
2334 goto fail;
2335 }
2336
2337 if (p_ace->type == SMB_ACL_MASK) {
2338 mask_entry = the_entry;
2339 got_mask_entry = True;
2340 }
2341
2342 /*
2343 * Ok - we now know the ACL calls should be working, don't
2344 * allow fallback to chmod.
2345 */
2346
2347 *pacl_set_support = True;
2348
2349 /*
2350 * Initialise the entry from the canon_ace.
2351 */
2352
2353 /*
2354 * First tell the entry what type of ACE this is.
2355 */
2356
2357 if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, the_entry, p_ace->type) == -1) {
2358 DEBUG(0,("set_canon_ace_list: Failed to set tag type on entry %d. (%s)\n",
2359 i, strerror(errno) ));
2360 goto fail;
2361 }
2362
2363 /*
2364 * Only set the qualifier (user or group id) if the entry is a user
2365 * or group id ACE.
2366 */
2367
2368 if ((p_ace->type == SMB_ACL_USER) || (p_ace->type == SMB_ACL_GROUP)) {
2369 if (SMB_VFS_SYS_ACL_SET_QUALIFIER(conn, the_entry,(void *)&p_ace->unix_ug.uid) == -1) {
2370 DEBUG(0,("set_canon_ace_list: Failed to set qualifier on entry %d. (%s)\n",
2371 i, strerror(errno) ));
2372 goto fail;
2373 }
2374 }
2375
2376 /*
2377 * Convert the mode_t perms in the canon_ace to a POSIX permset.
2378 */
2379
2380 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, the_entry, &the_permset) == -1) {
2381 DEBUG(0,("set_canon_ace_list: Failed to get permset on entry %d. (%s)\n",
2382 i, strerror(errno) ));
2383 goto fail;
2384 }
2385
2386 if (map_acl_perms_to_permset(conn, p_ace->perms, &the_permset) == -1) {
2387 DEBUG(0,("set_canon_ace_list: Failed to create permset for mode (%u) on entry %d. (%s)\n",
2388 (unsigned int)p_ace->perms, i, strerror(errno) ));
2389 goto fail;
2390 }
2391
2392 /*
2393 * ..and apply them to the entry.
2394 */
2395
2396 if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, the_entry, the_permset) == -1) {
2397 DEBUG(0,("set_canon_ace_list: Failed to add permset on entry %d. (%s)\n",
2398 i, strerror(errno) ));
2399 goto fail;
2400 }
2401
2402 if( DEBUGLVL( 10 ))
2403 print_canon_ace( p_ace, i);
2404
2405 }
2406
2407 if (needs_mask && !got_mask_entry) {
2408 if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &the_acl, &mask_entry) == -1) {
2409 DEBUG(0,("set_canon_ace_list: Failed to create mask entry. (%s)\n", strerror(errno) ));
2410 goto fail;
2411 }
2412
2413 if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, mask_entry, SMB_ACL_MASK) == -1) {
2414 DEBUG(0,("set_canon_ace_list: Failed to set tag type on mask entry. (%s)\n",strerror(errno) ));
2415 goto fail;
2416 }
2417
2418 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, mask_entry, &mask_permset) == -1) {
2419 DEBUG(0,("set_canon_ace_list: Failed to get mask permset. (%s)\n", strerror(errno) ));
2420 goto fail;
2421 }
2422
2423 if (map_acl_perms_to_permset(conn, S_IRUSR|S_IWUSR|S_IXUSR, &mask_permset) == -1) {
2424 DEBUG(0,("set_canon_ace_list: Failed to create mask permset. (%s)\n", strerror(errno) ));
2425 goto fail;
2426 }
2427
2428 if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, mask_entry, mask_permset) == -1) {
2429 DEBUG(0,("set_canon_ace_list: Failed to add mask permset. (%s)\n", strerror(errno) ));
2430 goto fail;
2431 }
2432 }
2433
2434 /*
2435 * Check if the ACL is valid.
2436 */
2437
2438 if (SMB_VFS_SYS_ACL_VALID(conn, the_acl) == -1) {
2439 DEBUG(0,("set_canon_ace_list: ACL type (%s) is invalid for set (%s).\n",
2440 the_acl_type == SMB_ACL_TYPE_DEFAULT ? "directory default" : "file",
2441 strerror(errno) ));
2442 goto fail;
2443 }
2444
2445 /*
2446 * Finally apply it to the file or directory.
2447 */
2448
2449 if(default_ace || fsp->is_directory || fsp->fh->fd == -1) {
2450 if (SMB_VFS_SYS_ACL_SET_FILE(conn, fsp->fsp_name, the_acl_type, the_acl) == -1) {
2451 /*
2452 * Some systems allow all the above calls and only fail with no ACL support
2453 * when attempting to apply the acl. HPUX with HFS is an example of this. JRA.
2454 */
2455 if (no_acl_syscall_error(errno)) {
2456 *pacl_set_support = False;
2457 }
2458
2459 if (acl_group_override(conn, prim_gid)) {
2460 int sret;
2461
2462 DEBUG(5,("set_canon_ace_list: acl group control on and current user in file %s primary group.\n",
2463 fsp->fsp_name ));
2464
2465 become_root();
2466 sret = SMB_VFS_SYS_ACL_SET_FILE(conn, fsp->fsp_name, the_acl_type, the_acl);
2467 unbecome_root();
2468 if (sret == 0) {
2469 ret = True;
2470 }
2471 }
2472
2473 if (ret == False) {
2474 DEBUG(2,("set_canon_ace_list: sys_acl_set_file type %s failed for file %s (%s).\n",
2475 the_acl_type == SMB_ACL_TYPE_DEFAULT ? "directory default" : "file",
2476 fsp->fsp_name, strerror(errno) ));
2477 goto fail;
2478 }
2479 }
2480 } else {
2481 if (SMB_VFS_SYS_ACL_SET_FD(fsp, fsp->fh->fd, the_acl) == -1) {
2482 /*
2483 * Some systems allow all the above calls and only fail with no ACL support
2484 * when attempting to apply the acl. HPUX with HFS is an example of this. JRA.
2485 */
2486 if (no_acl_syscall_error(errno)) {
2487 *pacl_set_support = False;
2488 }
2489
2490 if (acl_group_override(conn, prim_gid)) {
2491 int sret;
2492
2493 DEBUG(5,("set_canon_ace_list: acl group control on and current user in file %s primary group.\n",
2494 fsp->fsp_name ));
2495
2496 become_root();
2497 sret = SMB_VFS_SYS_ACL_SET_FD(fsp, fsp->fh->fd, the_acl);
2498 unbecome_root();
2499 if (sret == 0) {
2500 ret = True;
2501 }
2502 }
2503
2504 if (ret == False) {
2505 DEBUG(2,("set_canon_ace_list: sys_acl_set_file failed for file %s (%s).\n",
2506 fsp->fsp_name, strerror(errno) ));
2507 goto fail;
2508 }
2509 }
2510 }
2511
2512 ret = True;
2513
2514 fail:
2515
2516 if (the_acl != NULL) {
2517 SMB_VFS_SYS_ACL_FREE_ACL(conn, the_acl);
2518 }
2519
2520 return ret;
2521 }
2522
2523 /****************************************************************************
2524 Find a particular canon_ace entry.
2525 ****************************************************************************/
2526
2527 static struct canon_ace *canon_ace_entry_for(struct canon_ace *list, SMB_ACL_TAG_T type, posix_id *id)
2528 {
2529 while (list) {
2530 if (list->type == type && ((type != SMB_ACL_USER && type != SMB_ACL_GROUP) ||
2531 (type == SMB_ACL_USER && id && id->uid == list->unix_ug.uid) ||
2532 (type == SMB_ACL_GROUP && id && id->gid == list->unix_ug.gid)))
2533 break;
2534 list = list->next;
2535 }
2536 return list;
2537 }
2538
2539 /****************************************************************************
2540
2541 ****************************************************************************/
2542
2543 SMB_ACL_T free_empty_sys_acl(connection_struct *conn, SMB_ACL_T the_acl)
2544 {
2545 SMB_ACL_ENTRY_T entry;
2546
2547 if (!the_acl)
2548 return NULL;
2549 if (SMB_VFS_SYS_ACL_GET_ENTRY(conn, the_acl, SMB_ACL_FIRST_ENTRY, &entry) != 1) {
2550 SMB_VFS_SYS_ACL_FREE_ACL(conn, the_acl);
2551 return NULL;
2552 }
2553 return the_acl;
2554 }
2555
2556 /****************************************************************************
2557 Convert a canon_ace to a generic 3 element permission - if possible.
2558 ****************************************************************************/
2559
2560 #define MAP_PERM(p,mask,result) (((p) & (mask)) ? (result) : 0 )
2561
2562 static BOOL convert_canon_ace_to_posix_perms( files_struct *fsp, canon_ace *file_ace_list, mode_t *posix_perms)
2563 {
2564 int snum = SNUM(fsp->conn);
2565 size_t ace_count = count_canon_ace_list(file_ace_list);
2566 canon_ace *ace_p;
2567 canon_ace *owner_ace = NULL;
2568 canon_ace *group_ace = NULL;
2569 canon_ace *other_ace = NULL;
2570 mode_t and_bits;
2571 mode_t or_bits;
2572
2573 if (ace_count != 3) {
2574 DEBUG(3,("convert_canon_ace_to_posix_perms: Too many ACE entries for file %s to convert to \
2575 posix perms.\n", fsp->fsp_name ));
2576 return False;
2577 }
2578
2579 for (ace_p = file_ace_list; ace_p; ace_p = ace_p->next) {
2580 if (ace_p->owner_type == UID_ACE)
2581 owner_ace = ace_p;
2582 else if (ace_p->owner_type == GID_ACE)
2583 group_ace = ace_p;
2584 else if (ace_p->owner_type == WORLD_ACE)
2585 other_ace = ace_p;
2586 }
2587
2588 if (!owner_ace || !group_ace || !other_ace) {
2589 DEBUG(3,("convert_canon_ace_to_posix_perms: Can't get standard entries for file %s.\n",
2590 fsp->fsp_name ));
2591 return False;
2592 }
2593
2594 *posix_perms = (mode_t)0;
2595
2596 *posix_perms |= owner_ace->perms;
2597 *posix_perms |= MAP_PERM(group_ace->perms, S_IRUSR, S_IRGRP);
2598 *posix_perms |= MAP_PERM(group_ace->perms, S_IWUSR, S_IWGRP);
2599 *posix_perms |= MAP_PERM(group_ace->perms, S_IXUSR, S_IXGRP);
2600 *posix_perms |= MAP_PERM(other_ace->perms, S_IRUSR, S_IROTH);
2601 *posix_perms |= MAP_PERM(other_ace->perms, S_IWUSR, S_IWOTH);
2602 *posix_perms |= MAP_PERM(other_ace->perms, S_IXUSR, S_IXOTH);
2603
2604 /* The owner must have at least read access. */
2605
2606 *posix_perms |= S_IRUSR;
2607 if (fsp->is_directory)
2608 *posix_perms |= (S_IWUSR|S_IXUSR);
2609
2610 /* If requested apply the masks. */
2611
2612 /* Get the initial bits to apply. */
2613
2614 if (fsp->is_directory) {
2615 and_bits = lp_dir_security_mask(snum);
2616 or_bits = lp_force_dir_security_mode(snum);
2617 } else {
2618 and_bits = lp_security_mask(snum);
2619 or_bits = lp_force_security_mode(snum);
2620 }
2621
2622 *posix_perms = (((*posix_perms) & and_bits)|or_bits);
2623
2624 DEBUG(10,("convert_canon_ace_to_posix_perms: converted u=%o,g=%o,w=%o to perm=0%o for file %s.\n",
2625 (int)owner_ace->perms, (int)group_ace->perms, (int)other_ace->perms, (int)*posix_perms,
2626 fsp->fsp_name ));
2627
2628 return True;
2629 }
2630
2631 /****************************************************************************
2632 Incoming NT ACLs on a directory can be split into a default POSIX acl (CI|OI|IO) and
2633 a normal POSIX acl. Win2k needs these split acls re-merging into one ACL
2634 with CI|OI set so it is inherited and also applies to the directory.
2635 Based on code from "Jim McDonough" <jmcd@us.ibm.com>.
2636 ****************************************************************************/
2637
2638 static size_t merge_default_aces( SEC_ACE *nt_ace_list, size_t num_aces)
2639 {
2640 size_t i, j;
2641
2642 for (i = 0; i < num_aces; i++) {
2643 for (j = i+1; j < num_aces; j++) {
2644 uint32 i_flags_ni = (nt_ace_list[i].flags & ~SEC_ACE_FLAG_INHERITED_ACE);
2645 uint32 j_flags_ni = (nt_ace_list[j].flags & ~SEC_ACE_FLAG_INHERITED_ACE);
2646 BOOL i_inh = (nt_ace_list[i].flags & SEC_ACE_FLAG_INHERITED_ACE) ? True : False;
2647 BOOL j_inh = (nt_ace_list[j].flags & SEC_ACE_FLAG_INHERITED_ACE) ? True : False;
2648
2649 /* We know the lower number ACE's are file entries. */
2650 if ((nt_ace_list[i].type == nt_ace_list[j].type) &&
2651 (nt_ace_list[i].size == nt_ace_list[j].size) &&
2652 (nt_ace_list[i].info.mask == nt_ace_list[j].info.mask) &&
2653 sid_equal(&nt_ace_list[i].trustee, &nt_ace_list[j].trustee) &&
2654 (i_inh == j_inh) &&
2655 (i_flags_ni == 0) &&
2656 (j_flags_ni == (SEC_ACE_FLAG_OBJECT_INHERIT|
2657 SEC_ACE_FLAG_CONTAINER_INHERIT|
2658 SEC_ACE_FLAG_INHERIT_ONLY))) {
2659 /*
2660 * W2K wants to have access allowed zero access ACE's
2661 * at the end of the list. If the mask is zero, merge
2662 * the non-inherited ACE onto the inherited ACE.
2663 */
2664
2665 if (nt_ace_list[i].info.mask == 0) {
2666 nt_ace_list[j].flags = SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT|
2667 (i_inh ? SEC_ACE_FLAG_INHERITED_ACE : 0);
2668 if (num_aces - i - 1 > 0)
2669 memmove(&nt_ace_list[i], &nt_ace_list[i+1], (num_aces-i-1) *
2670 sizeof(SEC_ACE));
2671
2672 DEBUG(10,("merge_default_aces: Merging zero access ACE %u onto ACE %u.\n",
2673 (unsigned int)i, (unsigned int)j ));
2674 } else {
2675 /*
2676 * These are identical except for the flags.
2677 * Merge the inherited ACE onto the non-inherited ACE.
2678 */
2679
2680 nt_ace_list[i].flags = SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT|
2681 (i_inh ? SEC_ACE_FLAG_INHERITED_ACE : 0);
2682 if (num_aces - j - 1 > 0)
2683 memmove(&nt_ace_list[j], &nt_ace_list[j+1], (num_aces-j-1) *
2684 sizeof(SEC_ACE));
2685
2686 DEBUG(10,("merge_default_aces: Merging ACE %u onto ACE %u.\n",
2687 (unsigned int)j, (unsigned int)i ));
2688 }
2689 num_aces--;
2690 break;
2691 }
2692 }
2693 }
2694
2695 return num_aces;
2696 }
2697 /****************************************************************************
2698 Reply to query a security descriptor from an fsp. If it succeeds it allocates
2699 the space for the return elements and returns the size needed to return the
2700 security descriptor. This should be the only external function needed for
2701 the UNIX style get ACL.
2702 ****************************************************************************/
2703
2704 size_t get_nt_acl(files_struct *fsp, uint32 security_info, SEC_DESC **ppdesc)
2705 {
2706 connection_struct *conn = fsp->conn;
2707 SMB_STRUCT_STAT sbuf;
2708 SEC_ACE *nt_ace_list = NULL;
2709 DOM_SID owner_sid;
2710 DOM_SID group_sid;
2711 size_t sd_size = 0;
2712 SEC_ACL *psa = NULL;
2713 size_t num_acls = 0;
2714 size_t num_def_acls = 0;
2715 size_t num_aces = 0;
2716 SMB_ACL_T posix_acl = NULL;
2717 SMB_ACL_T def_acl = NULL;
2718 canon_ace *file_ace = NULL;
2719 canon_ace *dir_ace = NULL;
2720 size_t num_profile_acls = 0;
2721 struct pai_val *pal = NULL;
2722 SEC_DESC *psd = NULL;
2723
2724 *ppdesc = NULL;
2725
2726 DEBUG(10,("get_nt_acl: called for file %s\n", fsp->fsp_name ));
2727
2728 if(fsp->is_directory || fsp->fh->fd == -1) {
2729
2730 /* Get the stat struct for the owner info. */
2731 if(SMB_VFS_STAT(fsp->conn,fsp->fsp_name, &sbuf) != 0) {
2732 return 0;
2733 }
2734 /*
2735 * Get the ACL from the path.
2736 */
2737
2738 posix_acl = SMB_VFS_SYS_ACL_GET_FILE(conn, fsp->fsp_name, SMB_ACL_TYPE_ACCESS);
2739
2740 /*
2741 * If it's a directory get the default POSIX ACL.
2742 */
2743
2744 if(fsp->is_directory) {
2745 def_acl = SMB_VFS_SYS_ACL_GET_FILE(conn, fsp->fsp_name, SMB_ACL_TYPE_DEFAULT);
2746 def_acl = free_empty_sys_acl(conn, def_acl);
2747 }
2748
2749 } else {
2750
2751 /* Get the stat struct for the owner info. */
2752 if(SMB_VFS_FSTAT(fsp,fsp->fh->fd,&sbuf) != 0) {
2753 return 0;
2754 }
2755 /*
2756 * Get the ACL from the fd.
2757 */
2758 posix_acl = SMB_VFS_SYS_ACL_GET_FD(fsp, fsp->fh->fd);
2759 }
2760
2761 DEBUG(5,("get_nt_acl : file ACL %s, directory ACL %s\n",
2762 posix_acl ? "present" : "absent",
2763 def_acl ? "present" : "absent" ));
2764
2765 pal = load_inherited_info(fsp);
2766
2767 /*
2768 * Get the owner, group and world SIDs.
2769 */
2770
2771 if (lp_profile_acls(SNUM(conn))) {
2772 /* For WXP SP1 the owner must be administrators. */
2773 sid_copy(&owner_sid, &global_sid_Builtin_Administrators);
2774 sid_copy(&group_sid, &global_sid_Builtin_Users);
2775 num_profile_acls = 2;
2776 } else {
2777 create_file_sids(&sbuf, &owner_sid, &group_sid);
2778 }
2779
2780 if ((security_info & DACL_SECURITY_INFORMATION) && !(security_info & PROTECTED_DACL_SECURITY_INFORMATION)) {
2781
2782 /*
2783 * In the optimum case Creator Owner and Creator Group would be used for
2784 * the ACL_USER_OBJ and ACL_GROUP_OBJ entries, respectively, but this
2785 * would lead to usability problems under Windows: The Creator entries
2786 * are only available in browse lists of directories and not for files;
2787 * additionally the identity of the owning group couldn't be determined.
2788 * We therefore use those identities only for Default ACLs.
2789 */
2790
2791 /* Create the canon_ace lists. */
2792 file_ace = canonicalise_acl( fsp, posix_acl, &sbuf, &owner_sid, &group_sid, pal, SMB_ACL_TYPE_ACCESS );
2793
2794 /* We must have *some* ACLS. */
2795
2796 if (count_canon_ace_list(file_ace) == 0) {
2797 DEBUG(0,("get_nt_acl : No ACLs on file (%s) !\n", fsp->fsp_name ));
2798 goto done;
2799 }
2800
2801 if (fsp->is_directory && def_acl) {
2802 dir_ace = canonicalise_acl(fsp, def_acl, &sbuf,
2803 &global_sid_Creator_Owner,
2804 &global_sid_Creator_Group, pal, SMB_ACL_TYPE_DEFAULT );
2805 }
2806
2807 /*
2808 * Create the NT ACE list from the canonical ace lists.
2809 */
2810
2811 {
2812 canon_ace *ace;
2813 int nt_acl_type;
2814 int i;
2815
2816 if (nt4_compatible_acls() && dir_ace) {
2817 /*
2818 * NT 4 chokes if an ACL contains an INHERIT_ONLY entry
2819 * but no non-INHERIT_ONLY entry for one SID. So we only
2820 * remove entries from the Access ACL if the
2821 * corresponding Default ACL entries have also been
2822 * removed. ACEs for CREATOR-OWNER and CREATOR-GROUP
2823 * are exceptions. We can do nothing
2824 * intelligent if the Default ACL contains entries that
2825 * are not also contained in the Access ACL, so this
2826 * case will still fail under NT 4.
2827 */
2828
2829 ace = canon_ace_entry_for(dir_ace, SMB_ACL_OTHER, NULL);
2830 if (ace && !ace->perms) {
2831 DLIST_REMOVE(dir_ace, ace);
2832 SAFE_FREE(ace);
2833
2834 ace = canon_ace_entry_for(file_ace, SMB_ACL_OTHER, NULL);
2835 if (ace && !ace->perms) {
2836 DLIST_REMOVE(file_ace, ace);
2837 SAFE_FREE(ace);
2838 }
2839 }
2840
2841 /*
2842 * WinNT doesn't usually have Creator Group
2843 * in browse lists, so we send this entry to
2844 * WinNT even if it contains no relevant
2845 * permissions. Once we can add
2846 * Creator Group to browse lists we can
2847 * re-enable this.
2848 */
2849
2850 #if 0
2851 ace = canon_ace_entry_for(dir_ace, SMB_ACL_GROUP_OBJ, NULL);
2852 if (ace && !ace->perms) {
2853 DLIST_REMOVE(dir_ace, ace);
2854 SAFE_FREE(ace);
2855 }
2856 #endif
2857
2858 ace = canon_ace_entry_for(file_ace, SMB_ACL_GROUP_OBJ, NULL);
2859 if (ace && !ace->perms) {
2860 DLIST_REMOVE(file_ace, ace);
2861 SAFE_FREE(ace);
2862 }
2863 }
2864
2865 num_acls = count_canon_ace_list(file_ace);
2866 num_def_acls = count_canon_ace_list(dir_ace);
2867
2868 /* Allocate the ace list. */
2869 if ((nt_ace_list = SMB_MALLOC_ARRAY(SEC_ACE,num_acls + num_profile_acls + num_def_acls)) == NULL) {
2870 DEBUG(0,("get_nt_acl: Unable to malloc space for nt_ace_list.\n"));
2871 goto done;
2872 }
2873
2874 memset(nt_ace_list, '\0', (num_acls + num_def_acls) * sizeof(SEC_ACE) );
2875
2876 /*
2877 * Create the NT ACE list from the canonical ace lists.
2878 */
2879
2880 ace = file_ace;
2881
2882 for (i = 0; i < num_acls; i++, ace = ace->next) {
2883 SEC_ACCESS acc;
2884
2885 acc = map_canon_ace_perms(SNUM(conn), &nt_acl_type, &owner_sid, ace, fsp->is_directory);
2886 init_sec_ace(&nt_ace_list[num_aces++], &ace->trustee, nt_acl_type, acc, ace->inherited ? SEC_ACE_FLAG_INHERITED_ACE : 0);
2887 }
2888
2889 /* The User must have access to a profile share - even if we can't map the SID. */
2890 if (lp_profile_acls(SNUM(conn))) {
2891 SEC_ACCESS acc;
2892
2893 init_sec_access(&acc,FILE_GENERIC_ALL);
2894 init_sec_ace(&nt_ace_list[num_aces++], &global_sid_Builtin_Users, SEC_ACE_TYPE_ACCESS_ALLOWED,
2895 acc, 0);
2896 }
2897
2898 ace = dir_ace;
2899
2900 for (i = 0; i < num_def_acls; i++, ace = ace->next) {
2901 SEC_ACCESS acc;
2902
2903 acc = map_canon_ace_perms(SNUM(conn), &nt_acl_type, &owner_sid, ace, fsp->is_directory);
2904 init_sec_ace(&nt_ace_list[num_aces++], &ace->trustee, nt_acl_type, acc,
2905 SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT|
2906 SEC_ACE_FLAG_INHERIT_ONLY|
2907 (ace->inherited ? SEC_ACE_FLAG_INHERITED_ACE : 0));
2908 }
2909
2910 /* The User must have access to a profile share - even if we can't map the SID. */
2911 if (lp_profile_acls(SNUM(conn))) {
2912 SEC_ACCESS acc;
2913
2914 init_sec_access(&acc,FILE_GENERIC_ALL);
2915 init_sec_ace(&nt_ace_list[num_aces++], &global_sid_Builtin_Users, SEC_ACE_TYPE_ACCESS_ALLOWED, acc,
2916 SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT|
2917 SEC_ACE_FLAG_INHERIT_ONLY|0);
2918 }
2919
2920 /*
2921 * Merge POSIX default ACLs and normal ACLs into one NT ACE.
2922 * Win2K needs this to get the inheritance correct when replacing ACLs
2923 * on a directory tree. Based on work by Jim @ IBM.
2924 */
2925
2926 num_aces = merge_default_aces(nt_ace_list, num_aces);
2927
2928 }
2929
2930 if (num_aces) {
2931 if((psa = make_sec_acl( main_loop_talloc_get(), NT4_ACL_REVISION, num_aces, nt_ace_list)) == NULL) {
2932 DEBUG(0,("get_nt_acl: Unable to malloc space for acl.\n"));
2933 goto done;
2934 }
2935 }
2936 } /* security_info & DACL_SECURITY_INFORMATION */
2937
2938 psd = make_standard_sec_desc( main_loop_talloc_get(),
2939 (security_info & OWNER_SECURITY_INFORMATION) ? &owner_sid : NULL,
2940 (security_info & GROUP_SECURITY_INFORMATION) ? &group_sid : NULL,
2941 psa,
2942 &sd_size);
2943
2944 if(!psd) {
2945 DEBUG(0,("get_nt_acl: Unable to malloc space for security descriptor.\n"));
2946 sd_size = 0;
2947 goto done;
2948 }
2949
2950 /*
2951 * Windows 2000: The DACL_PROTECTED flag in the security
2952 * descriptor marks the ACL as non-inheriting, i.e., no
2953 * ACEs from higher level directories propagate to this
2954 * ACL. In the POSIX ACL model permissions are only
2955 * inherited at file create time, so ACLs never contain
2956 * any ACEs that are inherited dynamically. The DACL_PROTECTED
2957 * flag doesn't seem to bother Windows NT.
2958 * Always set this if map acl inherit is turned off.
2959 */
2960 if (get_protected_flag(pal) || !lp_map_acl_inherit(SNUM(conn))) {
2961 psd->type |= SE_DESC_DACL_PROTECTED;
2962 }
2963
2964 if (psd->dacl) {
2965 dacl_sort_into_canonical_order(psd->dacl->ace, (unsigned int)psd->dacl->num_aces);
2966 }
2967
2968 *ppdesc = psd;
2969
2970 done:
2971
2972 if (posix_acl) {
2973 SMB_VFS_SYS_ACL_FREE_ACL(conn, posix_acl);
2974 }
2975 if (def_acl) {
2976 SMB_VFS_SYS_ACL_FREE_ACL(conn, def_acl);
2977 }
2978 free_canon_ace_list(file_ace);
2979 free_canon_ace_list(dir_ace);
2980 free_inherited_info(pal);
2981 SAFE_FREE(nt_ace_list);
2982
2983 return sd_size;
2984 }
2985
2986 /****************************************************************************
2987 Try to chown a file. We will be able to chown it under the following conditions.
2988
2989 1) If we have root privileges, then it will just work.
2990 2) If we have SeTakeOwnershipPrivilege we can change the user to the current user.
2991 3) If we have SeRestorePrivilege we can change the user to any other user.
2992 4) If we have write permission to the file and dos_filemodes is set
2993 then allow chown to the currently authenticated user.
2994 ****************************************************************************/
2995
2996 static int try_chown(connection_struct *conn, const char *fname, uid_t uid, gid_t gid)
2997 {
2998 int ret;
2999 files_struct *fsp;
3000 SMB_STRUCT_STAT st;
3001
3002 if(!CAN_WRITE(conn)) {
3003 return -1;
3004 }
3005
3006 /* Case (1). */
3007 /* try the direct way first */
3008 ret = SMB_VFS_CHOWN(conn, fname, uid, gid);
3009 if (ret == 0)
3010 return 0;
3011
3012 /* Case (2) / (3) */
3013 if (lp_enable_privileges()) {
3014
3015 BOOL has_take_ownership_priv = user_has_privileges(current_user.nt_user_token,
3016 &se_take_ownership);
3017 BOOL has_restore_priv = user_has_privileges(current_user.nt_user_token,
3018 &se_restore);
3019
3020 /* Case (2) */
3021 if ( ( has_take_ownership_priv && ( uid == current_user.ut.uid ) ) ||
3022 /* Case (3) */
3023 ( has_restore_priv ) ) {
3024
3025 become_root();
3026 /* Keep the current file gid the same - take ownership doesn't imply group change. */
3027 ret = SMB_VFS_CHOWN(conn, fname, uid, (gid_t)-1);
3028 unbecome_root();
3029 return ret;
3030 }
3031 }
3032
3033 /* Case (4). */
3034 if (!lp_dos_filemode(SNUM(conn))) {
3035 return -1;
3036 }
3037
3038 if (SMB_VFS_STAT(conn,fname,&st)) {
3039 return -1;
3040 }
3041
3042 fsp = open_file_fchmod(conn,fname,&st);
3043 if (!fsp) {
3044 return -1;
3045 }
3046
3047 /* only allow chown to the current user. This is more secure,
3048 and also copes with the case where the SID in a take ownership ACL is
3049 a local SID on the users workstation
3050 */
3051 uid = current_user.ut.uid;
3052
3053 become_root();
3054 /* Keep the current file gid the same. */
3055 ret = SMB_VFS_FCHOWN(fsp, fsp->fh->fd, uid, (gid_t)-1);
3056 unbecome_root();
3057
3058 close_file_fchmod(fsp);
3059
3060 return ret;
3061 }
3062
3063 /****************************************************************************
3064 Reply to set a security descriptor on an fsp. security_info_sent is the
3065 description of the following NT ACL.
3066 This should be the only external function needed for the UNIX style set ACL.
3067 ****************************************************************************/
3068
3069 BOOL set_nt_acl(files_struct *fsp, uint32 security_info_sent, SEC_DESC *psd)
3070 {
3071 connection_struct *conn = fsp->conn;
3072 uid_t user = (uid_t)-1;
3073 gid_t grp = (gid_t)-1;
3074 SMB_STRUCT_STAT sbuf;
3075 DOM_SID file_owner_sid;
3076 DOM_SID file_grp_sid;
3077 canon_ace *file_ace_list = NULL;
3078 canon_ace *dir_ace_list = NULL;
3079 BOOL acl_perms = False;
3080 mode_t orig_mode = (mode_t)0;
3081 uid_t orig_uid;
3082 gid_t orig_gid;
3083 BOOL need_chown = False;
3084
3085 DEBUG(10,("set_nt_acl: called for file %s\n", fsp->fsp_name ));
3086
3087 if (!CAN_WRITE(conn)) {
3088 DEBUG(10,("set acl rejected on read-only share\n"));
3089 return False;
3090 }
3091
3092 /*
3093 * Get the current state of the file.
3094 */
3095
3096 if(fsp->is_directory || fsp->fh->fd == -1) {
3097 if(SMB_VFS_STAT(fsp->conn,fsp->fsp_name, &sbuf) != 0)
3098 return False;
3099 } else {
3100 if(SMB_VFS_FSTAT(fsp,fsp->fh->fd,&sbuf) != 0)
3101 return False;
3102 }
3103
3104 /* Save the original elements we check against. */
3105 orig_mode = sbuf.st_mode;
3106 orig_uid = sbuf.st_uid;
3107 orig_gid = sbuf.st_gid;
3108
3109 /*
3110 * Unpack the user/group/world id's.
3111 */
3112
3113 if (!unpack_nt_owners( SNUM(conn), &sbuf, &user, &grp, security_info_sent, psd)) {
3114 return False;
3115 }
3116
3117 /*
3118 * Do we need to chown ?
3119 */
3120
3121 if (((user != (uid_t)-1) && (orig_uid != user)) || (( grp != (gid_t)-1) && (orig_gid != grp))) {
3122 need_chown = True;
3123 }
3124
3125 /*
3126 * Chown before setting ACL only if we don't change the user, or
3127 * if we change to the current user, but not if we want to give away
3128 * the file.
3129 */
3130
3131 if (need_chown && (user == (uid_t)-1 || user == current_user.ut.uid)) {
3132
3133 DEBUG(3,("set_nt_acl: chown %s. uid = %u, gid = %u.\n",
3134 fsp->fsp_name, (unsigned int)user, (unsigned int)grp ));
3135
3136 if(try_chown( fsp->conn, fsp->fsp_name, user, grp) == -1) {
3137 DEBUG(3,("set_nt_acl: chown %s, %u, %u failed. Error = %s.\n",
3138 fsp->fsp_name, (unsigned int)user, (unsigned int)grp, strerror(errno) ));
3139 return False;
3140 }
3141
3142 /*
3143 * Recheck the current state of the file, which may have changed.
3144 * (suid/sgid bits, for instance)
3145 */
3146
3147 if(fsp->is_directory) {
3148 if(SMB_VFS_STAT(fsp->conn, fsp->fsp_name, &sbuf) != 0) {
3149 return False;
3150 }
3151 } else {
3152
3153 int ret;
3154
3155 if(fsp->fh->fd == -1)
3156 ret = SMB_VFS_STAT(fsp->conn, fsp->fsp_name, &sbuf);
3157 else
3158 ret = SMB_VFS_FSTAT(fsp,fsp->fh->fd,&sbuf);
3159
3160 if(ret != 0)
3161 return False;
3162 }
3163
3164 /* Save the original elements we check against. */
3165 orig_mode = sbuf.st_mode;
3166 orig_uid = sbuf.st_uid;
3167 orig_gid = sbuf.st_gid;
3168
3169 /* We did it, don't try again */
3170 need_chown = False;
3171 }
3172
3173 create_file_sids(&sbuf, &file_owner_sid, &file_grp_sid);
3174
3175 acl_perms = unpack_canon_ace( fsp, &sbuf, &file_owner_sid, &file_grp_sid,
3176 &file_ace_list, &dir_ace_list, security_info_sent, psd);
3177
3178 /* Ignore W2K traverse DACL set. */
3179 if (file_ace_list || dir_ace_list) {
3180
3181 if (!acl_perms) {
3182 DEBUG(3,("set_nt_acl: cannot set permissions\n"));
3183 free_canon_ace_list(file_ace_list);
3184 free_canon_ace_list(dir_ace_list);
3185 return False;
3186 }
3187
3188 /*
3189 * Only change security if we got a DACL.
3190 */
3191
3192 if((security_info_sent & DACL_SECURITY_INFORMATION) && (psd->dacl != NULL)) {
3193
3194 BOOL acl_set_support = False;
3195 BOOL ret = False;
3196
3197 /*
3198 * Try using the POSIX ACL set first. Fall back to chmod if
3199 * we have no ACL support on this filesystem.
3200 */
3201
3202 if (acl_perms && file_ace_list) {
3203 ret = set_canon_ace_list(fsp, file_ace_list, False, sbuf.st_gid, &acl_set_support);
3204 if (acl_set_support && ret == False) {
3205 DEBUG(3,("set_nt_acl: failed to set file acl on file %s (%s).\n", fsp->fsp_name, strerror(errno) ));
3206 free_canon_ace_list(file_ace_list);
3207 free_canon_ace_list(dir_ace_list);
3208 return False;
3209 }
3210 }
3211
3212 if (acl_perms && acl_set_support && fsp->is_directory) {
3213 if (dir_ace_list) {
3214 if (!set_canon_ace_list(fsp, dir_ace_list, True, sbuf.st_gid, &acl_set_support)) {
3215 DEBUG(3,("set_nt_acl: failed to set default acl on directory %s (%s).\n", fsp->fsp_name, strerror(errno) ));
3216 free_canon_ace_list(file_ace_list);
3217 free_canon_ace_list(dir_ace_list);
3218 return False;
3219 }
3220 } else {
3221
3222 /*
3223 * No default ACL - delete one if it exists.
3224 */
3225
3226 if (SMB_VFS_SYS_ACL_DELETE_DEF_FILE(conn, fsp->fsp_name) == -1) {
3227 int sret = -1;
3228
3229 if (acl_group_override(conn, sbuf.st_gid)) {
3230 DEBUG(5,("set_nt_acl: acl group control on and "
3231 "current user in file %s primary group. Override delete_def_acl\n",
3232 fsp->fsp_name ));
3233
3234 become_root();
3235 sret = SMB_VFS_SYS_ACL_DELETE_DEF_FILE(conn, fsp->fsp_name);
3236 unbecome_root();
3237 }
3238
3239 if (sret == -1) {
3240 DEBUG(3,("set_nt_acl: sys_acl_delete_def_file failed (%s)\n", strerror(errno)));
3241 free_canon_ace_list(file_ace_list);
3242 free_canon_ace_list(dir_ace_list);
3243 return False;
3244 }
3245 }
3246 }
3247 }
3248
3249 if (acl_set_support) {
3250 store_inheritance_attributes(fsp, file_ace_list, dir_ace_list,
3251 (psd->type & SE_DESC_DACL_PROTECTED) ? True : False);
3252 }
3253
3254 /*
3255 * If we cannot set using POSIX ACLs we fall back to checking if we need to chmod.
3256 */
3257
3258 if(!acl_set_support && acl_perms) {
3259 mode_t posix_perms;
3260
3261 if (!convert_canon_ace_to_posix_perms( fsp, file_ace_list, &posix_perms)) {
3262 free_canon_ace_list(file_ace_list);
3263 free_canon_ace_list(dir_ace_list);
3264 DEBUG(3,("set_nt_acl: failed to convert file acl to posix permissions for file %s.\n",
3265 fsp->fsp_name ));
3266 return False;
3267 }
3268
3269 if (orig_mode != posix_perms) {
3270
3271 DEBUG(3,("set_nt_acl: chmod %s. perms = 0%o.\n",
3272 fsp->fsp_name, (unsigned int)posix_perms ));
3273
3274 if(SMB_VFS_CHMOD(conn,fsp->fsp_name, posix_perms) == -1) {
3275 int sret = -1;
3276 if (acl_group_override(conn, sbuf.st_gid)) {
3277 DEBUG(5,("set_nt_acl: acl group control on and "
3278 "current user in file %s primary group. Override chmod\n",
3279 fsp->fsp_name ));
3280
3281 become_root();
3282 sret = SMB_VFS_CHMOD(conn,fsp->fsp_name, posix_perms);
3283 unbecome_root();
3284 }
3285
3286 if (sret == -1) {
3287 DEBUG(3,("set_nt_acl: chmod %s, 0%o failed. Error = %s.\n",
3288 fsp->fsp_name, (unsigned int)posix_perms, strerror(errno) ));
3289 free_canon_ace_list(file_ace_list);
3290 free_canon_ace_list(dir_ace_list);
3291 return False;
3292 }
3293 }
3294 }
3295 }
3296 }
3297
3298 free_canon_ace_list(file_ace_list);
3299 free_canon_ace_list(dir_ace_list);
3300 }
3301
3302 /* Any chown pending? */
3303 if (need_chown) {
3304
3305 DEBUG(3,("set_nt_acl: chown %s. uid = %u, gid = %u.\n",
3306 fsp->fsp_name, (unsigned int)user, (unsigned int)grp ));
3307
3308 if(try_chown( fsp->conn, fsp->fsp_name, user, grp) == -1) {
3309 DEBUG(3,("set_nt_acl: chown %s, %u, %u failed. Error = %s.\n",
3310 fsp->fsp_name, (unsigned int)user, (unsigned int)grp, strerror(errno) ));
3311 return False;
3312 }
3313 }
3314
3315 return True;
3316 }
3317
3318 /****************************************************************************
3319 Get the actual group bits stored on a file with an ACL. Has no effect if
3320 the file has no ACL. Needed in dosmode code where the stat() will return
3321 the mask bits, not the real group bits, for a file with an ACL.
3322 ****************************************************************************/
3323
3324 int get_acl_group_bits( connection_struct *conn, const char *fname, mode_t *mode )
3325 {
3326 int entry_id = SMB_ACL_FIRST_ENTRY;
3327 SMB_ACL_ENTRY_T entry;
3328 SMB_ACL_T posix_acl;
3329 int result = -1;
3330
3331 posix_acl = SMB_VFS_SYS_ACL_GET_FILE(conn, fname, SMB_ACL_TYPE_ACCESS);
3332 if (posix_acl == (SMB_ACL_T)NULL)
3333 return -1;
3334
3335 while (SMB_VFS_SYS_ACL_GET_ENTRY(conn, posix_acl, entry_id, &entry) == 1) {
3336 SMB_ACL_TAG_T tagtype;
3337 SMB_ACL_PERMSET_T permset;
3338
3339 /* get_next... */
3340 if (entry_id == SMB_ACL_FIRST_ENTRY)
3341 entry_id = SMB_ACL_NEXT_ENTRY;
3342
3343 if (SMB_VFS_SYS_ACL_GET_TAG_TYPE(conn, entry, &tagtype) ==-1)
3344 break;
3345
3346 if (tagtype == SMB_ACL_GROUP_OBJ) {
3347 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, entry, &permset) == -1) {
3348 break;
3349 } else {
3350 *mode &= ~(S_IRGRP|S_IWGRP|S_IXGRP);
3351 *mode |= (SMB_VFS_SYS_ACL_GET_PERM(conn, permset, SMB_ACL_READ) ? S_IRGRP : 0);
3352 *mode |= (SMB_VFS_SYS_ACL_GET_PERM(conn, permset, SMB_ACL_WRITE) ? S_IWGRP : 0);
3353 *mode |= (SMB_VFS_SYS_ACL_GET_PERM(conn, permset, SMB_ACL_EXECUTE) ? S_IXGRP : 0);
3354 result = 0;
3355 break;
3356 }
3357 }
3358 }
3359 SMB_VFS_SYS_ACL_FREE_ACL(conn, posix_acl);
3360 return result;
3361 }
3362
3363 /****************************************************************************
3364 Do a chmod by setting the ACL USER_OBJ, GROUP_OBJ and OTHER bits in an ACL
3365 and set the mask to rwx. Needed to preserve complex ACLs set by NT.
3366 ****************************************************************************/
3367
3368 static int chmod_acl_internals( connection_struct *conn, SMB_ACL_T posix_acl, mode_t mode)
3369 {
3370 int entry_id = SMB_ACL_FIRST_ENTRY;
3371 SMB_ACL_ENTRY_T entry;
3372 int num_entries = 0;
3373
3374 while ( SMB_VFS_SYS_ACL_GET_ENTRY(conn, posix_acl, entry_id, &entry) == 1) {
3375 SMB_ACL_TAG_T tagtype;
3376 SMB_ACL_PERMSET_T permset;
3377 mode_t perms;
3378
3379 /* get_next... */
3380 if (entry_id == SMB_ACL_FIRST_ENTRY)
3381 entry_id = SMB_ACL_NEXT_ENTRY;
3382
3383 if (SMB_VFS_SYS_ACL_GET_TAG_TYPE(conn, entry, &tagtype) == -1)
3384 return -1;
3385
3386 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, entry, &permset) == -1)
3387 return -1;
3388
3389 num_entries++;
3390
3391 switch(tagtype) {
3392 case SMB_ACL_USER_OBJ:
3393 perms = unix_perms_to_acl_perms(mode, S_IRUSR, S_IWUSR, S_IXUSR);
3394 break;
3395 case SMB_ACL_GROUP_OBJ:
3396 perms = unix_perms_to_acl_perms(mode, S_IRGRP, S_IWGRP, S_IXGRP);
3397 break;
3398 case SMB_ACL_MASK:
3399 /*
3400 * FIXME: The ACL_MASK entry permissions should really be set to
3401 * the union of the permissions of all ACL_USER,
3402 * ACL_GROUP_OBJ, and ACL_GROUP entries. That's what
3403 * acl_calc_mask() does, but Samba ACLs doesn't provide it.
3404 */
3405 perms = S_IRUSR|S_IWUSR|S_IXUSR;
3406 break;
3407 case SMB_ACL_OTHER:
3408 perms = unix_perms_to_acl_perms(mode, S_IROTH, S_IWOTH, S_IXOTH);
3409 break;
3410 default:
3411 continue;
3412 }
3413
3414 if (map_acl_perms_to_permset(conn, perms, &permset) == -1)
3415 return -1;
3416
3417 if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, entry, permset) == -1)
3418 return -1;
3419 }
3420
3421 /*
3422 * If this is a simple 3 element ACL or no elements then it's a standard
3423 * UNIX permission set. Just use chmod...
3424 */
3425
3426 if ((num_entries == 3) || (num_entries == 0))
3427 return -1;
3428
3429 return 0;
3430 }
3431
3432 /****************************************************************************
3433 Get the access ACL of FROM, do a chmod by setting the ACL USER_OBJ,
3434 GROUP_OBJ and OTHER bits in an ACL and set the mask to rwx. Set the
3435 resulting ACL on TO. Note that name is in UNIX character set.
3436 ****************************************************************************/
3437
3438 static int copy_access_acl(connection_struct *conn, const char *from, const char *to, mode_t mode)
3439 {
3440 SMB_ACL_T posix_acl = NULL;
3441 int ret = -1;
3442
3443 if ((posix_acl = SMB_VFS_SYS_ACL_GET_FILE(conn, from, SMB_ACL_TYPE_ACCESS)) == NULL)
3444 return -1;
3445
3446 if ((ret = chmod_acl_internals(conn, posix_acl, mode)) == -1)
3447 goto done;
3448
3449 ret = SMB_VFS_SYS_ACL_SET_FILE(conn, to, SMB_ACL_TYPE_ACCESS, posix_acl);
3450
3451 done:
3452
3453 SMB_VFS_SYS_ACL_FREE_ACL(conn, posix_acl);
3454 return ret;
3455 }
3456
3457 /****************************************************************************
3458 Do a chmod by setting the ACL USER_OBJ, GROUP_OBJ and OTHER bits in an ACL
3459 and set the mask to rwx. Needed to preserve complex ACLs set by NT.
3460 Note that name is in UNIX character set.
3461 ****************************************************************************/
3462
3463 int chmod_acl(connection_struct *conn, const char *name, mode_t mode)
3464 {
3465 return copy_access_acl(conn, name, name, mode);
3466 }
3467
3468 /****************************************************************************
3469 If "inherit permissions" is set and the parent directory has no default
3470 ACL but it does have an Access ACL, inherit this Access ACL to file name.
3471 ****************************************************************************/
3472
3473 int inherit_access_acl(connection_struct *conn, const char *name, mode_t mode)
3474 {
3475 pstring dirname;
3476 pstrcpy(dirname, parent_dirname(name));
3477
3478 if (!lp_inherit_perms(SNUM(conn)) || directory_has_default_acl(conn, dirname))
3479 return 0;
3480
3481 return copy_access_acl(conn, dirname, name, mode);
3482 }
3483
3484 /****************************************************************************
3485 Do an fchmod by setting the ACL USER_OBJ, GROUP_OBJ and OTHER bits in an ACL
3486 and set the mask to rwx. Needed to preserve complex ACLs set by NT.
3487 ****************************************************************************/
3488
3489 int fchmod_acl(files_struct *fsp, int fd, mode_t mode)
3490 {
3491 connection_struct *conn = fsp->conn;
3492 SMB_ACL_T posix_acl = NULL;
3493 int ret = -1;
3494
3495 if ((posix_acl = SMB_VFS_SYS_ACL_GET_FD(fsp, fd)) == NULL)
3496 return -1;
3497
3498 if ((ret = chmod_acl_internals(conn, posix_acl, mode)) == -1)
3499 goto done;
3500
3501 ret = SMB_VFS_SYS_ACL_SET_FD(fsp, fd, posix_acl);
3502
3503 done:
3504
3505 SMB_VFS_SYS_ACL_FREE_ACL(conn, posix_acl);
3506 return ret;
3507 }
3508
3509 /****************************************************************************
3510 Check for an existing default POSIX ACL on a directory.
3511 ****************************************************************************/
3512
3513 BOOL directory_has_default_acl(connection_struct *conn, const char *fname)
3514 {
3515 SMB_ACL_T def_acl = SMB_VFS_SYS_ACL_GET_FILE( conn, fname, SMB_ACL_TYPE_DEFAULT);
3516 BOOL has_acl = False;
3517 SMB_ACL_ENTRY_T entry;
3518
3519 if (def_acl != NULL && (SMB_VFS_SYS_ACL_GET_ENTRY(conn, def_acl, SMB_ACL_FIRST_ENTRY, &entry) == 1)) {
3520 has_acl = True;
3521 }
3522
3523 if (def_acl) {
3524 SMB_VFS_SYS_ACL_FREE_ACL(conn, def_acl);
3525 }
3526 return has_acl;
3527 }
3528
3529 /****************************************************************************
3530 Map from wire type to permset.
3531 ****************************************************************************/
3532
3533 static BOOL unix_ex_wire_to_permset(connection_struct *conn, unsigned char wire_perm, SMB_ACL_PERMSET_T *p_permset)
3534 {
3535 if (wire_perm & ~(SMB_POSIX_ACL_READ|SMB_POSIX_ACL_WRITE|SMB_POSIX_ACL_EXECUTE)) {
3536 return False;
3537 }
3538
3539 if (SMB_VFS_SYS_ACL_CLEAR_PERMS(conn, *p_permset) == -1) {
3540 return False;
3541 }
3542
3543 if (wire_perm & SMB_POSIX_ACL_READ) {
3544 if (SMB_VFS_SYS_ACL_ADD_PERM(conn, *p_permset, SMB_ACL_READ) == -1) {
3545 return False;
3546 }
3547 }
3548 if (wire_perm & SMB_POSIX_ACL_WRITE) {
3549 if (SMB_VFS_SYS_ACL_ADD_PERM(conn, *p_permset, SMB_ACL_WRITE) == -1) {
3550 return False;
3551 }
3552 }
3553 if (wire_perm & SMB_POSIX_ACL_EXECUTE) {
3554 if (SMB_VFS_SYS_ACL_ADD_PERM(conn, *p_permset, SMB_ACL_EXECUTE) == -1) {
3555 return False;
3556 }
3557 }
3558 return True;
3559 }
3560
3561 /****************************************************************************
3562 Map from wire type to tagtype.
3563 ****************************************************************************/
3564
3565 static BOOL unix_ex_wire_to_tagtype(unsigned char wire_tt, SMB_ACL_TAG_T *p_tt)
3566 {
3567 switch (wire_tt) {
3568 case SMB_POSIX_ACL_USER_OBJ:
3569 *p_tt = SMB_ACL_USER_OBJ;
3570 break;
3571 case SMB_POSIX_ACL_USER:
3572 *p_tt = SMB_ACL_USER;
3573 break;
3574 case SMB_POSIX_ACL_GROUP_OBJ:
3575 *p_tt = SMB_ACL_GROUP_OBJ;
3576 break;
3577 case SMB_POSIX_ACL_GROUP:
3578 *p_tt = SMB_ACL_GROUP;
3579 break;
3580 case SMB_POSIX_ACL_MASK:
3581 *p_tt = SMB_ACL_MASK;
3582 break;
3583 case SMB_POSIX_ACL_OTHER:
3584 *p_tt = SMB_ACL_OTHER;
3585 break;
3586 default:
3587 return False;
3588 }
3589 return True;
3590 }
3591
3592 /****************************************************************************
3593 Create a new POSIX acl from wire permissions.
3594 FIXME ! How does the share mask/mode fit into this.... ?
3595 ****************************************************************************/
3596
3597 static SMB_ACL_T create_posix_acl_from_wire(connection_struct *conn, uint16 num_acls, const char *pdata)
3598 {
3599 unsigned int i;
3600 SMB_ACL_T the_acl = SMB_VFS_SYS_ACL_INIT(conn, num_acls);
3601
3602 if (the_acl == NULL) {
3603 return NULL;
3604 }
3605
3606 for (i = 0; i < num_acls; i++) {
3607 SMB_ACL_ENTRY_T the_entry;
3608 SMB_ACL_PERMSET_T the_permset;
3609 SMB_ACL_TAG_T tag_type;
3610
3611 if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &the_acl, &the_entry) == -1) {
3612 DEBUG(0,("create_posix_acl_from_wire: Failed to create entry %u. (%s)\n",
3613 i, strerror(errno) ));
3614 goto fail;
3615 }
3616
3617 if (!unix_ex_wire_to_tagtype(CVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)), &tag_type)) {
3618 DEBUG(0,("create_posix_acl_from_wire: invalid wire tagtype %u on entry %u.\n",
3619 CVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)), i ));
3620 goto fail;
3621 }
3622
3623 if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, the_entry, tag_type) == -1) {
3624 DEBUG(0,("create_posix_acl_from_wire: Failed to set tagtype on entry %u. (%s)\n",
3625 i, strerror(errno) ));
3626 goto fail;
3627 }
3628
3629 /* Get the permset pointer from the new ACL entry. */
3630 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, the_entry, &the_permset) == -1) {
3631 DEBUG(0,("create_posix_acl_from_wire: Failed to get permset on entry %u. (%s)\n",
3632 i, strerror(errno) ));
3633 goto fail;
3634 }
3635
3636 /* Map from wire to permissions. */
3637 if (!unix_ex_wire_to_permset(conn, CVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)+1), &the_permset)) {
3638 DEBUG(0,("create_posix_acl_from_wire: invalid permset %u on entry %u.\n",
3639 CVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE) + 1), i ));
3640 goto fail;
3641 }
3642
3643 /* Now apply to the new ACL entry. */
3644 if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, the_entry, the_permset) == -1) {
3645 DEBUG(0,("create_posix_acl_from_wire: Failed to add permset on entry %u. (%s)\n",
3646 i, strerror(errno) ));
3647 goto fail;
3648 }
3649
3650 if (tag_type == SMB_ACL_USER) {
3651 uint32 uidval = IVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)+2);
3652 uid_t uid = (uid_t)uidval;
3653 if (SMB_VFS_SYS_ACL_SET_QUALIFIER(conn, the_entry,(void *)&uid) == -1) {
3654 DEBUG(0,("create_posix_acl_from_wire: Failed to set uid %u on entry %u. (%s)\n",
3655 (unsigned int)uid, i, strerror(errno) ));
3656 goto fail;
3657 }
3658 }
3659
3660 if (tag_type == SMB_ACL_GROUP) {
3661 uint32 gidval = IVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)+2);
3662 gid_t gid = (uid_t)gidval;
3663 if (SMB_VFS_SYS_ACL_SET_QUALIFIER(conn, the_entry,(void *)&gid) == -1) {
3664 DEBUG(0,("create_posix_acl_from_wire: Failed to set gid %u on entry %u. (%s)\n",
3665 (unsigned int)gid, i, strerror(errno) ));
3666 goto fail;
3667 }
3668 }
3669 }
3670
3671 return the_acl;
3672
3673 fail:
3674
3675 if (the_acl != NULL) {
3676 SMB_VFS_SYS_ACL_FREE_ACL(conn, the_acl);
3677 }
3678 return NULL;
3679 }
3680
3681 /****************************************************************************
3682 Calls from UNIX extensions - Default POSIX ACL set.
3683 If num_def_acls == 0 and not a directory just return. If it is a directory
3684 and num_def_acls == 0 then remove the default acl. Else set the default acl
3685 on the directory.
3686 ****************************************************************************/
3687
3688 BOOL set_unix_posix_default_acl(connection_struct *conn, const char *fname, SMB_STRUCT_STAT *psbuf,
3689 uint16 num_def_acls, const char *pdata)
3690 {
3691 SMB_ACL_T def_acl = NULL;
3692
3693 if (num_def_acls && !S_ISDIR(psbuf->st_mode)) {
3694 DEBUG(5,("set_unix_posix_default_acl: Can't set default ACL on non-directory file %s\n", fname ));
3695 errno = EISDIR;
3696 return False;
3697 }
3698
3699 if (!num_def_acls) {
3700 /* Remove the default ACL. */
3701 if (SMB_VFS_SYS_ACL_DELETE_DEF_FILE(conn, fname) == -1) {
3702 DEBUG(5,("set_unix_posix_default_acl: acl_delete_def_file failed on directory %s (%s)\n",
3703 fname, strerror(errno) ));
3704 return False;
3705 }
3706 return True;
3707 }
3708
3709 if ((def_acl = create_posix_acl_from_wire(conn, num_def_acls, pdata)) == NULL) {
3710 return False;
3711 }
3712
3713 if (SMB_VFS_SYS_ACL_SET_FILE(conn, fname, SMB_ACL_TYPE_DEFAULT, def_acl) == -1) {
3714 DEBUG(5,("set_unix_posix_default_acl: acl_set_file failed on directory %s (%s)\n",
3715 fname, strerror(errno) ));
3716 SMB_VFS_SYS_ACL_FREE_ACL(conn, def_acl);
3717 return False;
3718 }
3719
3720 DEBUG(10,("set_unix_posix_default_acl: set default acl for file %s\n", fname ));
3721 SMB_VFS_SYS_ACL_FREE_ACL(conn, def_acl);
3722 return True;
3723 }
3724
3725 /****************************************************************************
3726 Remove an ACL from a file. As we don't have acl_delete_entry() available
3727 we must read the current acl and copy all entries except MASK, USER and GROUP
3728 to a new acl, then set that. This (at least on Linux) causes any ACL to be
3729 removed.
3730 FIXME ! How does the share mask/mode fit into this.... ?
3731 ****************************************************************************/
3732
3733 static BOOL remove_posix_acl(connection_struct *conn, files_struct *fsp, const char *fname)
3734 {
3735 SMB_ACL_T file_acl = NULL;
3736 int entry_id = SMB_ACL_FIRST_ENTRY;
3737 SMB_ACL_ENTRY_T entry;
3738 BOOL ret = False;
3739 /* Create a new ACL with only 3 entries, u/g/w. */
3740 SMB_ACL_T new_file_acl = SMB_VFS_SYS_ACL_INIT(conn, 3);
3741 SMB_ACL_ENTRY_T user_ent = NULL;
3742 SMB_ACL_ENTRY_T group_ent = NULL;
3743 SMB_ACL_ENTRY_T other_ent = NULL;
3744
3745 if (new_file_acl == NULL) {
3746 DEBUG(5,("remove_posix_acl: failed to init new ACL with 3 entries for file %s.\n", fname));
3747 return False;
3748 }
3749
3750 /* Now create the u/g/w entries. */
3751 if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &new_file_acl, &user_ent) == -1) {
3752 DEBUG(5,("remove_posix_acl: Failed to create user entry for file %s. (%s)\n",
3753 fname, strerror(errno) ));
3754 goto done;
3755 }
3756 if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, user_ent, SMB_ACL_USER_OBJ) == -1) {
3757 DEBUG(5,("remove_posix_acl: Failed to set user entry for file %s. (%s)\n",
3758 fname, strerror(errno) ));
3759 goto done;
3760 }
3761
3762 if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &new_file_acl, &group_ent) == -1) {
3763 DEBUG(5,("remove_posix_acl: Failed to create group entry for file %s. (%s)\n",
3764 fname, strerror(errno) ));
3765 goto done;
3766 }
3767 if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, group_ent, SMB_ACL_GROUP_OBJ) == -1) {
3768 DEBUG(5,("remove_posix_acl: Failed to set group entry for file %s. (%s)\n",
3769 fname, strerror(errno) ));
3770 goto done;
3771 }
3772
3773 if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &new_file_acl, &other_ent) == -1) {
3774 DEBUG(5,("remove_posix_acl: Failed to create other entry for file %s. (%s)\n",
3775 fname, strerror(errno) ));
3776 goto done;
3777 }
3778 if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, other_ent, SMB_ACL_OTHER) == -1) {
3779 DEBUG(5,("remove_posix_acl: Failed to set other entry for file %s. (%s)\n",
3780 fname, strerror(errno) ));
3781 goto done;
3782 }
3783
3784 /* Get the current file ACL. */
3785 if (fsp && fsp->fh->fd != -1) {
3786 file_acl = SMB_VFS_SYS_ACL_GET_FD(fsp, fsp->fh->fd);
3787 } else {
3788 file_acl = SMB_VFS_SYS_ACL_GET_FILE( conn, fname, SMB_ACL_TYPE_ACCESS);
3789 }
3790
3791 if (file_acl == NULL) {
3792 /* This is only returned if an error occurred. Even for a file with
3793 no acl a u/g/w acl should be returned. */
3794 DEBUG(5,("remove_posix_acl: failed to get ACL from file %s (%s).\n",
3795 fname, strerror(errno) ));
3796 goto done;
3797 }
3798
3799 while ( SMB_VFS_SYS_ACL_GET_ENTRY(conn, file_acl, entry_id, &entry) == 1) {
3800 SMB_ACL_TAG_T tagtype;
3801 SMB_ACL_PERMSET_T permset;
3802
3803 /* get_next... */
3804 if (entry_id == SMB_ACL_FIRST_ENTRY)
3805 entry_id = SMB_ACL_NEXT_ENTRY;
3806
3807 if (SMB_VFS_SYS_ACL_GET_TAG_TYPE(conn, entry, &tagtype) == -1) {
3808 DEBUG(5,("remove_posix_acl: failed to get tagtype from ACL on file %s (%s).\n",
3809 fname, strerror(errno) ));
3810 goto done;
3811 }
3812
3813 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, entry, &permset) == -1) {
3814 DEBUG(5,("remove_posix_acl: failed to get permset from ACL on file %s (%s).\n",
3815 fname, strerror(errno) ));
3816 goto done;
3817 }
3818
3819 if (tagtype == SMB_ACL_USER_OBJ) {
3820 if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, user_ent, permset) == -1) {
3821 DEBUG(5,("remove_posix_acl: failed to set permset from ACL on file %s (%s).\n",
3822 fname, strerror(errno) ));
3823 }
3824 } else if (tagtype == SMB_ACL_GROUP_OBJ) {
3825 if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, group_ent, permset) == -1) {
3826 DEBUG(5,("remove_posix_acl: failed to set permset from ACL on file %s (%s).\n",
3827 fname, strerror(errno) ));
3828 }
3829 } else if (tagtype == SMB_ACL_OTHER) {
3830 if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, other_ent, permset) == -1) {
3831 DEBUG(5,("remove_posix_acl: failed to set permset from ACL on file %s (%s).\n",
3832 fname, strerror(errno) ));
3833 }
3834 }
3835 }
3836
3837 /* Set the new empty file ACL. */
3838 if (fsp && fsp->fh->fd != -1) {
3839 if (SMB_VFS_SYS_ACL_SET_FD(fsp, fsp->fh->fd, new_file_acl) == -1) {
3840 DEBUG(5,("remove_posix_acl: acl_set_file failed on %s (%s)\n",
3841 fname, strerror(errno) ));
3842 goto done;
3843 }
3844 } else {
3845 if (SMB_VFS_SYS_ACL_SET_FILE(conn, fname, SMB_ACL_TYPE_ACCESS, new_file_acl) == -1) {
3846 DEBUG(5,("remove_posix_acl: acl_set_file failed on %s (%s)\n",
3847 fname, strerror(errno) ));
3848 goto done;
3849 }
3850 }
3851
3852 ret = True;
3853
3854 done:
3855
3856 if (file_acl) {
3857 SMB_VFS_SYS_ACL_FREE_ACL(conn, file_acl);
3858 }
3859 if (new_file_acl) {
3860 SMB_VFS_SYS_ACL_FREE_ACL(conn, new_file_acl);
3861 }
3862 return ret;
3863 }
3864
3865 /****************************************************************************
3866 Calls from UNIX extensions - POSIX ACL set.
3867 If num_def_acls == 0 then read/modify/write acl after removing all entries
3868 except SMB_ACL_USER_OBJ, SMB_ACL_GROUP_OBJ, SMB_ACL_OTHER.
3869 ****************************************************************************/
3870
3871 BOOL set_unix_posix_acl(connection_struct *conn, files_struct *fsp, const char *fname, uint16 num_acls, const char *pdata)
3872 {
3873 SMB_ACL_T file_acl = NULL;
3874
3875 if (!num_acls) {
3876 /* Remove the ACL from the file. */
3877 return remove_posix_acl(conn, fsp, fname);
3878 }
3879
3880 if ((file_acl = create_posix_acl_from_wire(conn, num_acls, pdata)) == NULL) {
3881 return False;
3882 }
3883
3884 if (fsp && fsp->fh->fd != -1) {
3885 /* The preferred way - use an open fd. */
3886 if (SMB_VFS_SYS_ACL_SET_FD(fsp, fsp->fh->fd, file_acl) == -1) {
3887 DEBUG(5,("set_unix_posix_acl: acl_set_file failed on %s (%s)\n",
3888 fname, strerror(errno) ));
3889 SMB_VFS_SYS_ACL_FREE_ACL(conn, file_acl);
3890 return False;
3891 }
3892 } else {
3893 if (SMB_VFS_SYS_ACL_SET_FILE(conn, fname, SMB_ACL_TYPE_ACCESS, file_acl) == -1) {
3894 DEBUG(5,("set_unix_posix_acl: acl_set_file failed on %s (%s)\n",
3895 fname, strerror(errno) ));
3896 SMB_VFS_SYS_ACL_FREE_ACL(conn, file_acl);
3897 return False;
3898 }
3899 }
3900
3901 DEBUG(10,("set_unix_posix_acl: set acl for file %s\n", fname ));
3902 SMB_VFS_SYS_ACL_FREE_ACL(conn, file_acl);
3903 return True;
3904 }
3905
3906 /****************************************************************************
3907 Check for POSIX group ACLs. If none use stat entry.
3908 Return -1 if no match, 0 if match and denied, 1 if match and allowed.
3909 ****************************************************************************/
3910
3911 static int check_posix_acl_group_write(connection_struct *conn, const char *fname, SMB_STRUCT_STAT *psbuf)
3912 {
3913 SMB_ACL_T posix_acl = NULL;
3914 int entry_id = SMB_ACL_FIRST_ENTRY;
3915 SMB_ACL_ENTRY_T entry;
3916 int i;
3917 BOOL seen_mask = False;
3918 BOOL seen_owning_group = False;
3919 int ret = -1;
3920 gid_t cu_gid;
3921
3922 if ((posix_acl = SMB_VFS_SYS_ACL_GET_FILE(conn, fname, SMB_ACL_TYPE_ACCESS)) == NULL) {
3923 goto check_stat;
3924 }
3925
3926 /* First ensure the group mask allows group read. */
3927 /* Also check any user entries (these take preference over group). */
3928
3929 while ( SMB_VFS_SYS_ACL_GET_ENTRY(conn, posix_acl, entry_id, &entry) == 1) {
3930 SMB_ACL_TAG_T tagtype;
3931 SMB_ACL_PERMSET_T permset;
3932 int have_write = -1;
3933
3934 /* get_next... */
3935 if (entry_id == SMB_ACL_FIRST_ENTRY)
3936 entry_id = SMB_ACL_NEXT_ENTRY;
3937
3938 if (SMB_VFS_SYS_ACL_GET_TAG_TYPE(conn, entry, &tagtype) == -1) {
3939 goto check_stat;
3940 }
3941
3942 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, entry, &permset) == -1) {
3943 goto check_stat;
3944 }
3945
3946 have_write = SMB_VFS_SYS_ACL_GET_PERM(conn, permset, SMB_ACL_WRITE);
3947 if (have_write == -1) {
3948 goto check_stat;
3949 }
3950
3951 /*
3952 * Solaris returns 2 for this if write is available.
3953 * canonicalize to 0 or 1.
3954 */
3955 have_write = (have_write ? 1 : 0);
3956
3957 switch(tagtype) {
3958 case SMB_ACL_MASK:
3959 seen_mask = True;
3960 if (!have_write) {
3961 /* We don't have any group or explicit user write permission. */
3962 ret = -1; /* Allow caller to check "other" permissions. */
3963 DEBUG(10,("check_posix_acl_group_write: file %s \
3964 refusing write due to mask.\n", fname));
3965 goto done;
3966 }
3967 break;
3968 case SMB_ACL_USER:
3969 {
3970 /* Check against current_user.ut.uid. */
3971 uid_t *puid = (uid_t *)SMB_VFS_SYS_ACL_GET_QUALIFIER(conn, entry);
3972 if (puid == NULL) {
3973 goto check_stat;
3974 }
3975 if (current_user.ut.uid == *puid) {
3976 /* We have a uid match but we must ensure we have seen the acl mask. */
3977 ret = have_write;
3978 DEBUG(10,("check_posix_acl_group_write: file %s \
3979 match on user %u -> %s.\n", fname, (unsigned int)*puid, ret ? "can write" : "cannot write"));
3980 if (seen_mask) {
3981 goto done;
3982 }
3983 }
3984 break;
3985 }
3986 default:
3987 continue;
3988 }
3989 }
3990
3991 /* If ret is anything other than -1 we matched on a user entry. */
3992 if (ret != -1) {
3993 goto done;
3994 }
3995
3996 /* Next check all group entries. */
3997 entry_id = SMB_ACL_FIRST_ENTRY;
3998 while ( SMB_VFS_SYS_ACL_GET_ENTRY(conn, posix_acl, entry_id, &entry) == 1) {
3999 SMB_ACL_TAG_T tagtype;
4000 SMB_ACL_PERMSET_T permset;
4001 int have_write = -1;
4002
4003 /* get_next... */
4004 if (entry_id == SMB_ACL_FIRST_ENTRY)
4005 entry_id = SMB_ACL_NEXT_ENTRY;
4006
4007 if (SMB_VFS_SYS_ACL_GET_TAG_TYPE(conn, entry, &tagtype) == -1) {
4008 goto check_stat;
4009 }
4010
4011 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, entry, &permset) == -1) {
4012 goto check_stat;
4013 }
4014
4015 have_write = SMB_VFS_SYS_ACL_GET_PERM(conn, permset, SMB_ACL_WRITE);
4016 if (have_write == -1) {
4017 goto check_stat;
4018 }
4019
4020 /*
4021 * Solaris returns 2 for this if write is available.
4022 * canonicalize to 0 or 1.
4023 */
4024 have_write = (have_write ? 1 : 0);
4025
4026 switch(tagtype) {
4027 case SMB_ACL_GROUP:
4028 case SMB_ACL_GROUP_OBJ:
4029 {
4030 gid_t *pgid = NULL;
4031
4032 if (tagtype == SMB_ACL_GROUP) {
4033 pgid = (gid_t *)SMB_VFS_SYS_ACL_GET_QUALIFIER(conn, entry);
4034 } else {
4035 seen_owning_group = True;
4036 pgid = &psbuf->st_gid;
4037 }
4038 if (pgid == NULL) {
4039 goto check_stat;
4040 }
4041
4042 /*
4043 * Does it match the current effective group
4044 * or supplementary groups ?
4045 */
4046 for (cu_gid = get_current_user_gid_first(&i); cu_gid != (gid_t)-1;
4047 cu_gid = get_current_user_gid_next(&i)) {
4048 if (cu_gid == *pgid) {
4049 ret = have_write;
4050 DEBUG(10,("check_posix_acl_group_write: file %s \
4051 match on group %u -> can write.\n", fname, (unsigned int)cu_gid ));
4052
4053 /* If we don't have write permission this entry doesn't
4054 terminate the enumeration of the entries. */
4055 if (have_write) {
4056 goto done;
4057 }
4058 /* But does terminate the group iteration. */
4059 break;
4060 }
4061 }
4062 break;
4063 }
4064 default:
4065 continue;
4066 }
4067 }
4068
4069 /* If ret is -1 here we didn't match on the user entry or
4070 supplemental group entries. */
4071
4072 DEBUG(10,("check_posix_acl_group_write: ret = %d before check_stat:\n", ret));
4073
4074 check_stat:
4075
4076 /*
4077 * We only check the S_IWGRP permissions if we haven't already
4078 * seen an owning group SMB_ACL_GROUP_OBJ ace entry. If there is an
4079 * SMB_ACL_GROUP_OBJ ace entry then the group bits in st_gid are
4080 * the same as the SMB_ACL_MASK bits, not the SMB_ACL_GROUP_OBJ
4081 * bits. Thanks to Marc Cousin <mcousin@sigma.fr> for pointing
4082 * this out. JRA.
4083 */
4084
4085 if (!seen_owning_group) {
4086 /* Do we match on the owning group entry ? */
4087 /*
4088 * Does it match the current effective group
4089 * or supplementary groups ?
4090 */
4091 for (cu_gid = get_current_user_gid_first(&i); cu_gid != (gid_t)-1;
4092 cu_gid = get_current_user_gid_next(&i)) {
4093 if (cu_gid == psbuf->st_gid) {
4094 ret = (psbuf->st_mode & S_IWGRP) ? 1 : 0;
4095 DEBUG(10,("check_posix_acl_group_write: file %s \
4096 match on owning group %u -> %s.\n", fname, (unsigned int)psbuf->st_gid, ret ? "can write" : "cannot write"));
4097 break;
4098 }
4099 }
4100
4101 if (cu_gid == (gid_t)-1) {
4102 DEBUG(10,("check_posix_acl_group_write: file %s \
4103 failed to match on user or group in token (ret = %d).\n", fname, ret ));
4104 }
4105 }
4106
4107 done:
4108
4109 if (posix_acl) {
4110 SMB_VFS_SYS_ACL_FREE_ACL(conn, posix_acl);
4111 }
4112
4113 DEBUG(10,("check_posix_acl_group_write: file %s returning (ret = %d).\n", fname, ret ));
4114 return ret;
4115 }
4116
4117 /****************************************************************************
4118 Actually emulate the in-kernel access checking for delete access. We need
4119 this to successfully return ACCESS_DENIED on a file open for delete access.
4120 ****************************************************************************/
4121
4122 BOOL can_delete_file_in_directory(connection_struct *conn, const char *fname)
4123 {
4124 SMB_STRUCT_STAT sbuf;
4125 pstring dname;
4126 int ret;
4127
4128 if (!CAN_WRITE(conn)) {
4129 return False;
4130 }
4131
4132 /* Get the parent directory permission mask and owners. */
4133 pstrcpy(dname, parent_dirname(fname));
4134 if(SMB_VFS_STAT(conn, dname, &sbuf) != 0) {
4135 return False;
4136 }
4137 if (!S_ISDIR(sbuf.st_mode)) {
4138 return False;
4139 }
4140 if (current_user.ut.uid == 0 || conn->admin_user) {
4141 /* I'm sorry sir, I didn't know you were root... */
4142 return True;
4143 }
4144
4145 /* Check primary owner write access. */
4146 if (current_user.ut.uid == sbuf.st_uid) {
4147 return (sbuf.st_mode & S_IWUSR) ? True : False;
4148 }
4149
4150 #ifdef S_ISVTX
4151 /* sticky bit means delete only by owner or root. */
4152 if (sbuf.st_mode & S_ISVTX) {
4153 SMB_STRUCT_STAT sbuf_file;
4154 if(SMB_VFS_STAT(conn, fname, &sbuf_file) != 0) {
4155 return False;
4156 }
4157 /*
4158 * Patch from SATOH Fumiyasu <fumiyas@miraclelinux.com>
4159 * for bug #3348. Don't assume owning sticky bit
4160 * directory means write access allowed.
4161 */
4162 if (current_user.ut.uid != sbuf_file.st_uid) {
4163 return False;
4164 }
4165 }
4166 #endif
4167
4168 /* Check group or explicit user acl entry write access. */
4169 ret = check_posix_acl_group_write(conn, dname, &sbuf);
4170 if (ret == 0 || ret == 1) {
4171 return ret ? True : False;
4172 }
4173
4174 /* Finally check other write access. */
4175 return (sbuf.st_mode & S_IWOTH) ? True : False;
4176 }
4177
4178 /****************************************************************************
4179 Actually emulate the in-kernel access checking for write access. We need
4180 this to successfully check for ability to write for dos filetimes.
4181 Note this doesn't take into account share write permissions.
4182 ****************************************************************************/
4183
4184 BOOL can_write_to_file(connection_struct *conn, const char *fname, SMB_STRUCT_STAT *psbuf)
4185 {
4186 int ret;
4187
4188 if (current_user.ut.uid == 0 || conn->admin_user) {
4189 /* I'm sorry sir, I didn't know you were root... */
4190 return True;
4191 }
4192
4193 if (!VALID_STAT(*psbuf)) {
4194 /* Get the file permission mask and owners. */
4195 if(SMB_VFS_STAT(conn, fname, psbuf) != 0) {
4196 return False;
4197 }
4198 }
4199
4200 /* Check primary owner write access. */
4201 if (current_user.ut.uid == psbuf->st_uid) {
4202 return (psbuf->st_mode & S_IWUSR) ? True : False;
4203 }
4204
4205 /* Check group or explicit user acl entry write access. */
4206 ret = check_posix_acl_group_write(conn, fname, psbuf);
4207 if (ret == 0 || ret == 1) {
4208 return ret ? True : False;
4209 }
4210
4211 /* Finally check other write access. */
4212 return (psbuf->st_mode & S_IWOTH) ? True : False;
4213 }
4214
4215 /********************************************************************
4216 Pull the NT ACL from a file on disk or the OpenEventlog() access
4217 check. Caller is responsible for freeing the returned security
4218 descriptor via TALLOC_FREE(). This is designed for dealing with
4219 user space access checks in smbd outside of the VFS. For example,
4220 checking access rights in OpenEventlog().
4221
4222 Assume we are dealing with files (for now)
4223 ********************************************************************/
4224
4225 SEC_DESC* get_nt_acl_no_snum( TALLOC_CTX *ctx, const char *fname)
4226 {
4227 SEC_DESC *psd, *ret_sd;
4228 connection_struct conn;
4229 files_struct finfo;
4230 struct fd_handle fh;
4231 pstring path;
4232 pstring filename;
4233
4234 ZERO_STRUCT( conn );
4235 conn.service = -1;
4236
4237 if ( !(conn.mem_ctx = talloc_init( "novfs_get_nt_acl" )) ) {
4238 DEBUG(0,("get_nt_acl_no_snum: talloc() failed!\n"));
4239 return NULL;
4240 }
4241
4242 pstrcpy( path, "/" );
4243 set_conn_connectpath(&conn, path);
4244
4245 if (!smbd_vfs_init(&conn)) {
4246 DEBUG(0,("get_nt_acl_no_snum: Unable to create a fake connection struct!\n"));
4247 conn_free_internal( &conn );
4248 return NULL;
4249 }
4250
4251 ZERO_STRUCT( finfo );
4252 ZERO_STRUCT( fh );
4253
4254 finfo.fnum = -1;
4255 finfo.conn = &conn;
4256 finfo.fh = &fh;
4257 finfo.fh->fd = -1;
4258 pstrcpy( filename, fname );
4259 finfo.fsp_name = filename;
4260
4261 if (get_nt_acl( &finfo, DACL_SECURITY_INFORMATION, &psd ) == 0) {
4262 DEBUG(0,("get_nt_acl_no_snum: get_nt_acl returned zero.\n"));
4263 conn_free_internal( &conn );
4264 return NULL;
4265 }
4266
4267 ret_sd = dup_sec_desc( ctx, psd );
4268
4269 conn_free_internal( &conn );
4270
4271 return ret_sd;
4272 }