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[s3]loadparm: remove superfluous talloc context / talloc_stackframe call.
[Samba/gbeck.git] / source3 / smbd / posix_acls.c
blob7479aea0762d3144424d69306a6890698658bbe4
1 /*
2 Unix SMB/CIFS implementation.
3 SMB NT Security Descriptor / Unix permission conversion.
4 Copyright (C) Jeremy Allison 1994-2000.
5 Copyright (C) Andreas Gruenbacher 2002.
6
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 3 of the License, or
10 (at your option) any later version.
11
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
16
17 You should have received a copy of the GNU General Public License
18 along with this program. If not, see <http://www.gnu.org/licenses/>.
19 */
20
21 #include "includes.h"
22
23 extern struct current_user current_user;
24 extern const struct generic_mapping file_generic_mapping;
25
26 #undef DBGC_CLASS
27 #define DBGC_CLASS DBGC_ACLS
28
29 /****************************************************************************
30 Data structures representing the internal ACE format.
31 ****************************************************************************/
32
33 enum ace_owner {UID_ACE, GID_ACE, WORLD_ACE};
34 enum ace_attribute {ALLOW_ACE, DENY_ACE}; /* Used for incoming NT ACLS. */
35
36 typedef union posix_id {
37 uid_t uid;
38 gid_t gid;
39 int world;
40 } posix_id;
41
42 typedef struct canon_ace {
43 struct canon_ace *next, *prev;
44 SMB_ACL_TAG_T type;
45 mode_t perms; /* Only use S_I(R|W|X)USR mode bits here. */
46 DOM_SID trustee;
47 enum ace_owner owner_type;
48 enum ace_attribute attr;
49 posix_id unix_ug;
50 bool inherited;
51 } canon_ace;
52
53 #define ALL_ACE_PERMS (S_IRUSR|S_IWUSR|S_IXUSR)
54
55 /*
56 * EA format of user.SAMBA_PAI (Samba_Posix_Acl_Interitance)
57 * attribute on disk.
58 *
59 * | 1 | 1 | 2 | 2 | ....
60 * +------+------+-------------+---------------------+-------------+--------------------+
61 * | vers | flag | num_entries | num_default_entries | ..entries.. | default_entries... |
62 * +------+------+-------------+---------------------+-------------+--------------------+
63 */
64
65 #define PAI_VERSION_OFFSET 0
66 #define PAI_FLAG_OFFSET 1
67 #define PAI_NUM_ENTRIES_OFFSET 2
68 #define PAI_NUM_DEFAULT_ENTRIES_OFFSET 4
69 #define PAI_ENTRIES_BASE 6
70
71 #define PAI_VERSION 1
72 #define PAI_ACL_FLAG_PROTECTED 0x1
73 #define PAI_ENTRY_LENGTH 5
74
75 /*
76 * In memory format of user.SAMBA_PAI attribute.
77 */
78
79 struct pai_entry {
80 struct pai_entry *next, *prev;
81 enum ace_owner owner_type;
82 posix_id unix_ug;
83 };
84
85 struct pai_val {
86 bool pai_protected;
87 unsigned int num_entries;
88 struct pai_entry *entry_list;
89 unsigned int num_def_entries;
90 struct pai_entry *def_entry_list;
91 };
92
93 /************************************************************************
94 Return a uint32 of the pai_entry principal.
95 ************************************************************************/
96
97 static uint32 get_pai_entry_val(struct pai_entry *paie)
98 {
99 switch (paie->owner_type) {
100 case UID_ACE:
101 DEBUG(10,("get_pai_entry_val: uid = %u\n", (unsigned int)paie->unix_ug.uid ));
102 return (uint32)paie->unix_ug.uid;
103 case GID_ACE:
104 DEBUG(10,("get_pai_entry_val: gid = %u\n", (unsigned int)paie->unix_ug.gid ));
105 return (uint32)paie->unix_ug.gid;
106 case WORLD_ACE:
107 default:
108 DEBUG(10,("get_pai_entry_val: world ace\n"));
109 return (uint32)-1;
110 }
111 }
112
113 /************************************************************************
114 Return a uint32 of the entry principal.
115 ************************************************************************/
116
117 static uint32 get_entry_val(canon_ace *ace_entry)
118 {
119 switch (ace_entry->owner_type) {
120 case UID_ACE:
121 DEBUG(10,("get_entry_val: uid = %u\n", (unsigned int)ace_entry->unix_ug.uid ));
122 return (uint32)ace_entry->unix_ug.uid;
123 case GID_ACE:
124 DEBUG(10,("get_entry_val: gid = %u\n", (unsigned int)ace_entry->unix_ug.gid ));
125 return (uint32)ace_entry->unix_ug.gid;
126 case WORLD_ACE:
127 default:
128 DEBUG(10,("get_entry_val: world ace\n"));
129 return (uint32)-1;
130 }
131 }
132
133 /************************************************************************
134 Count the inherited entries.
135 ************************************************************************/
136
137 static unsigned int num_inherited_entries(canon_ace *ace_list)
138 {
139 unsigned int num_entries = 0;
140
141 for (; ace_list; ace_list = ace_list->next)
142 if (ace_list->inherited)
143 num_entries++;
144 return num_entries;
145 }
146
147 /************************************************************************
148 Create the on-disk format. Caller must free.
149 ************************************************************************/
150
151 static char *create_pai_buf(canon_ace *file_ace_list, canon_ace *dir_ace_list, bool pai_protected, size_t *store_size)
152 {
153 char *pai_buf = NULL;
154 canon_ace *ace_list = NULL;
155 char *entry_offset = NULL;
156 unsigned int num_entries = 0;
157 unsigned int num_def_entries = 0;
158
159 for (ace_list = file_ace_list; ace_list; ace_list = ace_list->next)
160 if (ace_list->inherited)
161 num_entries++;
162
163 for (ace_list = dir_ace_list; ace_list; ace_list = ace_list->next)
164 if (ace_list->inherited)
165 num_def_entries++;
166
167 DEBUG(10,("create_pai_buf: num_entries = %u, num_def_entries = %u\n", num_entries, num_def_entries ));
168
169 *store_size = PAI_ENTRIES_BASE + ((num_entries + num_def_entries)*PAI_ENTRY_LENGTH);
170
171 pai_buf = (char *)SMB_MALLOC(*store_size);
172 if (!pai_buf) {
173 return NULL;
174 }
175
176 /* Set up the header. */
177 memset(pai_buf, '\0', PAI_ENTRIES_BASE);
178 SCVAL(pai_buf,PAI_VERSION_OFFSET,PAI_VERSION);
179 SCVAL(pai_buf,PAI_FLAG_OFFSET,(pai_protected ? PAI_ACL_FLAG_PROTECTED : 0));
180 SSVAL(pai_buf,PAI_NUM_ENTRIES_OFFSET,num_entries);
181 SSVAL(pai_buf,PAI_NUM_DEFAULT_ENTRIES_OFFSET,num_def_entries);
182
183 entry_offset = pai_buf + PAI_ENTRIES_BASE;
184
185 for (ace_list = file_ace_list; ace_list; ace_list = ace_list->next) {
186 if (ace_list->inherited) {
187 uint8 type_val = (unsigned char)ace_list->owner_type;
188 uint32 entry_val = get_entry_val(ace_list);
189
190 SCVAL(entry_offset,0,type_val);
191 SIVAL(entry_offset,1,entry_val);
192 entry_offset += PAI_ENTRY_LENGTH;
193 }
194 }
195
196 for (ace_list = dir_ace_list; ace_list; ace_list = ace_list->next) {
197 if (ace_list->inherited) {
198 uint8 type_val = (unsigned char)ace_list->owner_type;
199 uint32 entry_val = get_entry_val(ace_list);
200
201 SCVAL(entry_offset,0,type_val);
202 SIVAL(entry_offset,1,entry_val);
203 entry_offset += PAI_ENTRY_LENGTH;
204 }
205 }
206
207 return pai_buf;
208 }
209
210 /************************************************************************
211 Store the user.SAMBA_PAI attribute on disk.
212 ************************************************************************/
213
214 static void store_inheritance_attributes(files_struct *fsp, canon_ace *file_ace_list,
215 canon_ace *dir_ace_list, bool pai_protected)
216 {
217 int ret;
218 size_t store_size;
219 char *pai_buf;
220
221 if (!lp_map_acl_inherit(SNUM(fsp->conn)))
222 return;
223
224 /*
225 * Don't store if this ACL isn't protected and
226 * none of the entries in it are marked as inherited.
227 */
228
229 if (!pai_protected && num_inherited_entries(file_ace_list) == 0 && num_inherited_entries(dir_ace_list) == 0) {
230 /* Instead just remove the attribute if it exists. */
231 if (fsp->fh->fd != -1)
232 SMB_VFS_FREMOVEXATTR(fsp, SAMBA_POSIX_INHERITANCE_EA_NAME);
233 else
234 SMB_VFS_REMOVEXATTR(fsp->conn, fsp->fsp_name, SAMBA_POSIX_INHERITANCE_EA_NAME);
235 return;
236 }
237
238 pai_buf = create_pai_buf(file_ace_list, dir_ace_list, pai_protected, &store_size);
239
240 if (fsp->fh->fd != -1)
241 ret = SMB_VFS_FSETXATTR(fsp, SAMBA_POSIX_INHERITANCE_EA_NAME,
242 pai_buf, store_size, 0);
243 else
244 ret = SMB_VFS_SETXATTR(fsp->conn,fsp->fsp_name, SAMBA_POSIX_INHERITANCE_EA_NAME,
245 pai_buf, store_size, 0);
246
247 SAFE_FREE(pai_buf);
248
249 DEBUG(10,("store_inheritance_attribute:%s for file %s\n", pai_protected ? " (protected)" : "", fsp->fsp_name));
250 if (ret == -1 && !no_acl_syscall_error(errno))
251 DEBUG(1,("store_inheritance_attribute: Error %s\n", strerror(errno) ));
252 }
253
254 /************************************************************************
255 Delete the in memory inheritance info.
256 ************************************************************************/
257
258 static void free_inherited_info(struct pai_val *pal)
259 {
260 if (pal) {
261 struct pai_entry *paie, *paie_next;
262 for (paie = pal->entry_list; paie; paie = paie_next) {
263 paie_next = paie->next;
264 SAFE_FREE(paie);
265 }
266 for (paie = pal->def_entry_list; paie; paie = paie_next) {
267 paie_next = paie->next;
268 SAFE_FREE(paie);
269 }
270 SAFE_FREE(pal);
271 }
272 }
273
274 /************************************************************************
275 Was this ACL protected ?
276 ************************************************************************/
277
278 static bool get_protected_flag(struct pai_val *pal)
279 {
280 if (!pal)
281 return False;
282 return pal->pai_protected;
283 }
284
285 /************************************************************************
286 Was this ACE inherited ?
287 ************************************************************************/
288
289 static bool get_inherited_flag(struct pai_val *pal, canon_ace *ace_entry, bool default_ace)
290 {
291 struct pai_entry *paie;
292
293 if (!pal)
294 return False;
295
296 /* If the entry exists it is inherited. */
297 for (paie = (default_ace ? pal->def_entry_list : pal->entry_list); paie; paie = paie->next) {
298 if (ace_entry->owner_type == paie->owner_type &&
299 get_entry_val(ace_entry) == get_pai_entry_val(paie))
300 return True;
301 }
302 return False;
303 }
304
305 /************************************************************************
306 Ensure an attribute just read is valid.
307 ************************************************************************/
308
309 static bool check_pai_ok(char *pai_buf, size_t pai_buf_data_size)
310 {
311 uint16 num_entries;
312 uint16 num_def_entries;
313
314 if (pai_buf_data_size < PAI_ENTRIES_BASE) {
315 /* Corrupted - too small. */
316 return False;
317 }
318
319 if (CVAL(pai_buf,PAI_VERSION_OFFSET) != PAI_VERSION)
320 return False;
321
322 num_entries = SVAL(pai_buf,PAI_NUM_ENTRIES_OFFSET);
323 num_def_entries = SVAL(pai_buf,PAI_NUM_DEFAULT_ENTRIES_OFFSET);
324
325 /* Check the entry lists match. */
326 /* Each entry is 5 bytes (type plus 4 bytes of uid or gid). */
327
328 if (((num_entries + num_def_entries)*PAI_ENTRY_LENGTH) + PAI_ENTRIES_BASE != pai_buf_data_size)
329 return False;
330
331 return True;
332 }
333
334
335 /************************************************************************
336 Convert to in-memory format.
337 ************************************************************************/
338
339 static struct pai_val *create_pai_val(char *buf, size_t size)
340 {
341 char *entry_offset;
342 struct pai_val *paiv = NULL;
343 int i;
344
345 if (!check_pai_ok(buf, size))
346 return NULL;
347
348 paiv = SMB_MALLOC_P(struct pai_val);
349 if (!paiv)
350 return NULL;
351
352 memset(paiv, '\0', sizeof(struct pai_val));
353
354 paiv->pai_protected = (CVAL(buf,PAI_FLAG_OFFSET) == PAI_ACL_FLAG_PROTECTED);
355
356 paiv->num_entries = SVAL(buf,PAI_NUM_ENTRIES_OFFSET);
357 paiv->num_def_entries = SVAL(buf,PAI_NUM_DEFAULT_ENTRIES_OFFSET);
358
359 entry_offset = buf + PAI_ENTRIES_BASE;
360
361 DEBUG(10,("create_pai_val:%s num_entries = %u, num_def_entries = %u\n",
362 paiv->pai_protected ? " (pai_protected)" : "", paiv->num_entries, paiv->num_def_entries ));
363
364 for (i = 0; i < paiv->num_entries; i++) {
365 struct pai_entry *paie;
366
367 paie = SMB_MALLOC_P(struct pai_entry);
368 if (!paie) {
369 free_inherited_info(paiv);
370 return NULL;
371 }
372
373 paie->owner_type = (enum ace_owner)CVAL(entry_offset,0);
374 switch( paie->owner_type) {
375 case UID_ACE:
376 paie->unix_ug.uid = (uid_t)IVAL(entry_offset,1);
377 DEBUG(10,("create_pai_val: uid = %u\n", (unsigned int)paie->unix_ug.uid ));
378 break;
379 case GID_ACE:
380 paie->unix_ug.gid = (gid_t)IVAL(entry_offset,1);
381 DEBUG(10,("create_pai_val: gid = %u\n", (unsigned int)paie->unix_ug.gid ));
382 break;
383 case WORLD_ACE:
384 paie->unix_ug.world = -1;
385 DEBUG(10,("create_pai_val: world ace\n"));
386 break;
387 default:
388 free_inherited_info(paiv);
389 return NULL;
390 }
391 entry_offset += PAI_ENTRY_LENGTH;
392 DLIST_ADD(paiv->entry_list, paie);
393 }
394
395 for (i = 0; i < paiv->num_def_entries; i++) {
396 struct pai_entry *paie;
397
398 paie = SMB_MALLOC_P(struct pai_entry);
399 if (!paie) {
400 free_inherited_info(paiv);
401 return NULL;
402 }
403
404 paie->owner_type = (enum ace_owner)CVAL(entry_offset,0);
405 switch( paie->owner_type) {
406 case UID_ACE:
407 paie->unix_ug.uid = (uid_t)IVAL(entry_offset,1);
408 DEBUG(10,("create_pai_val: (def) uid = %u\n", (unsigned int)paie->unix_ug.uid ));
409 break;
410 case GID_ACE:
411 paie->unix_ug.gid = (gid_t)IVAL(entry_offset,1);
412 DEBUG(10,("create_pai_val: (def) gid = %u\n", (unsigned int)paie->unix_ug.gid ));
413 break;
414 case WORLD_ACE:
415 paie->unix_ug.world = -1;
416 DEBUG(10,("create_pai_val: (def) world ace\n"));
417 break;
418 default:
419 free_inherited_info(paiv);
420 return NULL;
421 }
422 entry_offset += PAI_ENTRY_LENGTH;
423 DLIST_ADD(paiv->def_entry_list, paie);
424 }
425
426 return paiv;
427 }
428
429 /************************************************************************
430 Load the user.SAMBA_PAI attribute.
431 ************************************************************************/
432
433 static struct pai_val *fload_inherited_info(files_struct *fsp)
434 {
435 char *pai_buf;
436 size_t pai_buf_size = 1024;
437 struct pai_val *paiv = NULL;
438 ssize_t ret;
439
440 if (!lp_map_acl_inherit(SNUM(fsp->conn)))
441 return NULL;
442
443 if ((pai_buf = (char *)SMB_MALLOC(pai_buf_size)) == NULL)
444 return NULL;
445
446 do {
447 if (fsp->fh->fd != -1)
448 ret = SMB_VFS_FGETXATTR(fsp, SAMBA_POSIX_INHERITANCE_EA_NAME,
449 pai_buf, pai_buf_size);
450 else
451 ret = SMB_VFS_GETXATTR(fsp->conn,fsp->fsp_name,SAMBA_POSIX_INHERITANCE_EA_NAME,
452 pai_buf, pai_buf_size);
453
454 if (ret == -1) {
455 if (errno != ERANGE) {
456 break;
457 }
458 /* Buffer too small - enlarge it. */
459 pai_buf_size *= 2;
460 SAFE_FREE(pai_buf);
461 if (pai_buf_size > 1024*1024) {
462 return NULL; /* Limit malloc to 1mb. */
463 }
464 if ((pai_buf = (char *)SMB_MALLOC(pai_buf_size)) == NULL)
465 return NULL;
466 }
467 } while (ret == -1);
468
469 DEBUG(10,("load_inherited_info: ret = %lu for file %s\n", (unsigned long)ret, fsp->fsp_name));
470
471 if (ret == -1) {
472 /* No attribute or not supported. */
473 #if defined(ENOATTR)
474 if (errno != ENOATTR)
475 DEBUG(10,("load_inherited_info: Error %s\n", strerror(errno) ));
476 #else
477 if (errno != ENOSYS)
478 DEBUG(10,("load_inherited_info: Error %s\n", strerror(errno) ));
479 #endif
480 SAFE_FREE(pai_buf);
481 return NULL;
482 }
483
484 paiv = create_pai_val(pai_buf, ret);
485
486 if (paiv && paiv->pai_protected)
487 DEBUG(10,("load_inherited_info: ACL is protected for file %s\n", fsp->fsp_name));
488
489 SAFE_FREE(pai_buf);
490 return paiv;
491 }
492
493 /************************************************************************
494 Load the user.SAMBA_PAI attribute.
495 ************************************************************************/
496
497 static struct pai_val *load_inherited_info(const struct connection_struct *conn,
498 const char *fname)
499 {
500 char *pai_buf;
501 size_t pai_buf_size = 1024;
502 struct pai_val *paiv = NULL;
503 ssize_t ret;
504
505 if (!lp_map_acl_inherit(SNUM(conn))) {
506 return NULL;
507 }
508
509 if ((pai_buf = (char *)SMB_MALLOC(pai_buf_size)) == NULL) {
510 return NULL;
511 }
512
513 do {
514 ret = SMB_VFS_GETXATTR(conn, fname,
515 SAMBA_POSIX_INHERITANCE_EA_NAME,
516 pai_buf, pai_buf_size);
517
518 if (ret == -1) {
519 if (errno != ERANGE) {
520 break;
521 }
522 /* Buffer too small - enlarge it. */
523 pai_buf_size *= 2;
524 SAFE_FREE(pai_buf);
525 if (pai_buf_size > 1024*1024) {
526 return NULL; /* Limit malloc to 1mb. */
527 }
528 if ((pai_buf = (char *)SMB_MALLOC(pai_buf_size)) == NULL)
529 return NULL;
530 }
531 } while (ret == -1);
532
533 DEBUG(10,("load_inherited_info: ret = %lu for file %s\n", (unsigned long)ret, fname));
534
535 if (ret == -1) {
536 /* No attribute or not supported. */
537 #if defined(ENOATTR)
538 if (errno != ENOATTR)
539 DEBUG(10,("load_inherited_info: Error %s\n", strerror(errno) ));
540 #else
541 if (errno != ENOSYS)
542 DEBUG(10,("load_inherited_info: Error %s\n", strerror(errno) ));
543 #endif
544 SAFE_FREE(pai_buf);
545 return NULL;
546 }
547
548 paiv = create_pai_val(pai_buf, ret);
549
550 if (paiv && paiv->pai_protected) {
551 DEBUG(10,("load_inherited_info: ACL is protected for file %s\n", fname));
552 }
553
554 SAFE_FREE(pai_buf);
555 return paiv;
556 }
557
558 /****************************************************************************
559 Functions to manipulate the internal ACE format.
560 ****************************************************************************/
561
562 /****************************************************************************
563 Count a linked list of canonical ACE entries.
564 ****************************************************************************/
565
566 static size_t count_canon_ace_list( canon_ace *list_head )
567 {
568 size_t count = 0;
569 canon_ace *ace;
570
571 for (ace = list_head; ace; ace = ace->next)
572 count++;
573
574 return count;
575 }
576
577 /****************************************************************************
578 Free a linked list of canonical ACE entries.
579 ****************************************************************************/
580
581 static void free_canon_ace_list( canon_ace *list_head )
582 {
583 canon_ace *list, *next;
584
585 for (list = list_head; list; list = next) {
586 next = list->next;
587 DLIST_REMOVE(list_head, list);
588 SAFE_FREE(list);
589 }
590 }
591
592 /****************************************************************************
593 Function to duplicate a canon_ace entry.
594 ****************************************************************************/
595
596 static canon_ace *dup_canon_ace( canon_ace *src_ace)
597 {
598 canon_ace *dst_ace = SMB_MALLOC_P(canon_ace);
599
600 if (dst_ace == NULL)
601 return NULL;
602
603 *dst_ace = *src_ace;
604 dst_ace->prev = dst_ace->next = NULL;
605 return dst_ace;
606 }
607
608 /****************************************************************************
609 Print out a canon ace.
610 ****************************************************************************/
611
612 static void print_canon_ace(canon_ace *pace, int num)
613 {
614 dbgtext( "canon_ace index %d. Type = %s ", num, pace->attr == ALLOW_ACE ? "allow" : "deny" );
615 dbgtext( "SID = %s ", sid_string_dbg(&pace->trustee));
616 if (pace->owner_type == UID_ACE) {
617 const char *u_name = uidtoname(pace->unix_ug.uid);
618 dbgtext( "uid %u (%s) ", (unsigned int)pace->unix_ug.uid, u_name );
619 } else if (pace->owner_type == GID_ACE) {
620 char *g_name = gidtoname(pace->unix_ug.gid);
621 dbgtext( "gid %u (%s) ", (unsigned int)pace->unix_ug.gid, g_name );
622 } else
623 dbgtext( "other ");
624 switch (pace->type) {
625 case SMB_ACL_USER:
626 dbgtext( "SMB_ACL_USER ");
627 break;
628 case SMB_ACL_USER_OBJ:
629 dbgtext( "SMB_ACL_USER_OBJ ");
630 break;
631 case SMB_ACL_GROUP:
632 dbgtext( "SMB_ACL_GROUP ");
633 break;
634 case SMB_ACL_GROUP_OBJ:
635 dbgtext( "SMB_ACL_GROUP_OBJ ");
636 break;
637 case SMB_ACL_OTHER:
638 dbgtext( "SMB_ACL_OTHER ");
639 break;
640 default:
641 dbgtext( "MASK " );
642 break;
643 }
644 if (pace->inherited)
645 dbgtext( "(inherited) ");
646 dbgtext( "perms ");
647 dbgtext( "%c", pace->perms & S_IRUSR ? 'r' : '-');
648 dbgtext( "%c", pace->perms & S_IWUSR ? 'w' : '-');
649 dbgtext( "%c\n", pace->perms & S_IXUSR ? 'x' : '-');
650 }
651
652 /****************************************************************************
653 Print out a canon ace list.
654 ****************************************************************************/
655
656 static void print_canon_ace_list(const char *name, canon_ace *ace_list)
657 {
658 int count = 0;
659
660 if( DEBUGLVL( 10 )) {
661 dbgtext( "print_canon_ace_list: %s\n", name );
662 for (;ace_list; ace_list = ace_list->next, count++)
663 print_canon_ace(ace_list, count );
664 }
665 }
666
667 /****************************************************************************
668 Map POSIX ACL perms to canon_ace permissions (a mode_t containing only S_(R|W|X)USR bits).
669 ****************************************************************************/
670
671 static mode_t convert_permset_to_mode_t(connection_struct *conn, SMB_ACL_PERMSET_T permset)
672 {
673 mode_t ret = 0;
674
675 ret |= (SMB_VFS_SYS_ACL_GET_PERM(conn, permset, SMB_ACL_READ) ? S_IRUSR : 0);
676 ret |= (SMB_VFS_SYS_ACL_GET_PERM(conn, permset, SMB_ACL_WRITE) ? S_IWUSR : 0);
677 ret |= (SMB_VFS_SYS_ACL_GET_PERM(conn, permset, SMB_ACL_EXECUTE) ? S_IXUSR : 0);
678
679 return ret;
680 }
681
682 /****************************************************************************
683 Map generic UNIX permissions to canon_ace permissions (a mode_t containing only S_(R|W|X)USR bits).
684 ****************************************************************************/
685
686 static mode_t unix_perms_to_acl_perms(mode_t mode, int r_mask, int w_mask, int x_mask)
687 {
688 mode_t ret = 0;
689
690 if (mode & r_mask)
691 ret |= S_IRUSR;
692 if (mode & w_mask)
693 ret |= S_IWUSR;
694 if (mode & x_mask)
695 ret |= S_IXUSR;
696
697 return ret;
698 }
699
700 /****************************************************************************
701 Map canon_ace permissions (a mode_t containing only S_(R|W|X)USR bits) to
702 an SMB_ACL_PERMSET_T.
703 ****************************************************************************/
704
705 static int map_acl_perms_to_permset(connection_struct *conn, mode_t mode, SMB_ACL_PERMSET_T *p_permset)
706 {
707 if (SMB_VFS_SYS_ACL_CLEAR_PERMS(conn, *p_permset) == -1)
708 return -1;
709 if (mode & S_IRUSR) {
710 if (SMB_VFS_SYS_ACL_ADD_PERM(conn, *p_permset, SMB_ACL_READ) == -1)
711 return -1;
712 }
713 if (mode & S_IWUSR) {
714 if (SMB_VFS_SYS_ACL_ADD_PERM(conn, *p_permset, SMB_ACL_WRITE) == -1)
715 return -1;
716 }
717 if (mode & S_IXUSR) {
718 if (SMB_VFS_SYS_ACL_ADD_PERM(conn, *p_permset, SMB_ACL_EXECUTE) == -1)
719 return -1;
720 }
721 return 0;
722 }
723
724 /****************************************************************************
725 Function to create owner and group SIDs from a SMB_STRUCT_STAT.
726 ****************************************************************************/
727
728 static void create_file_sids(const SMB_STRUCT_STAT *psbuf, DOM_SID *powner_sid, DOM_SID *pgroup_sid)
729 {
730 uid_to_sid( powner_sid, psbuf->st_uid );
731 gid_to_sid( pgroup_sid, psbuf->st_gid );
732 }
733
734 /****************************************************************************
735 Is the identity in two ACEs equal ? Check both SID and uid/gid.
736 ****************************************************************************/
737
738 static bool identity_in_ace_equal(canon_ace *ace1, canon_ace *ace2)
739 {
740 if (sid_equal(&ace1->trustee, &ace2->trustee)) {
741 return True;
742 }
743 if (ace1->owner_type == ace2->owner_type) {
744 if (ace1->owner_type == UID_ACE &&
745 ace1->unix_ug.uid == ace2->unix_ug.uid) {
746 return True;
747 } else if (ace1->owner_type == GID_ACE &&
748 ace1->unix_ug.gid == ace2->unix_ug.gid) {
749 return True;
750 }
751 }
752 return False;
753 }
754
755 /****************************************************************************
756 Merge aces with a common sid - if both are allow or deny, OR the permissions together and
757 delete the second one. If the first is deny, mask the permissions off and delete the allow
758 if the permissions become zero, delete the deny if the permissions are non zero.
759 ****************************************************************************/
760
761 static void merge_aces( canon_ace **pp_list_head )
762 {
763 canon_ace *list_head = *pp_list_head;
764 canon_ace *curr_ace_outer;
765 canon_ace *curr_ace_outer_next;
766
767 /*
768 * First, merge allow entries with identical SIDs, and deny entries
769 * with identical SIDs.
770 */
771
772 for (curr_ace_outer = list_head; curr_ace_outer; curr_ace_outer = curr_ace_outer_next) {
773 canon_ace *curr_ace;
774 canon_ace *curr_ace_next;
775
776 curr_ace_outer_next = curr_ace_outer->next; /* Save the link in case we delete. */
777
778 for (curr_ace = curr_ace_outer->next; curr_ace; curr_ace = curr_ace_next) {
779
780 curr_ace_next = curr_ace->next; /* Save the link in case of delete. */
781
782 if (identity_in_ace_equal(curr_ace, curr_ace_outer) &&
783 (curr_ace->attr == curr_ace_outer->attr)) {
784
785 if( DEBUGLVL( 10 )) {
786 dbgtext("merge_aces: Merging ACE's\n");
787 print_canon_ace( curr_ace_outer, 0);
788 print_canon_ace( curr_ace, 0);
789 }
790
791 /* Merge two allow or two deny ACE's. */
792
793 curr_ace_outer->perms |= curr_ace->perms;
794 DLIST_REMOVE(list_head, curr_ace);
795 SAFE_FREE(curr_ace);
796 curr_ace_outer_next = curr_ace_outer->next; /* We may have deleted the link. */
797 }
798 }
799 }
800
801 /*
802 * Now go through and mask off allow permissions with deny permissions.
803 * We can delete either the allow or deny here as we know that each SID
804 * appears only once in the list.
805 */
806
807 for (curr_ace_outer = list_head; curr_ace_outer; curr_ace_outer = curr_ace_outer_next) {
808 canon_ace *curr_ace;
809 canon_ace *curr_ace_next;
810
811 curr_ace_outer_next = curr_ace_outer->next; /* Save the link in case we delete. */
812
813 for (curr_ace = curr_ace_outer->next; curr_ace; curr_ace = curr_ace_next) {
814
815 curr_ace_next = curr_ace->next; /* Save the link in case of delete. */
816
817 /*
818 * Subtract ACE's with different entries. Due to the ordering constraints
819 * we've put on the ACL, we know the deny must be the first one.
820 */
821
822 if (identity_in_ace_equal(curr_ace, curr_ace_outer) &&
823 (curr_ace_outer->attr == DENY_ACE) && (curr_ace->attr == ALLOW_ACE)) {
824
825 if( DEBUGLVL( 10 )) {
826 dbgtext("merge_aces: Masking ACE's\n");
827 print_canon_ace( curr_ace_outer, 0);
828 print_canon_ace( curr_ace, 0);
829 }
830
831 curr_ace->perms &= ~curr_ace_outer->perms;
832
833 if (curr_ace->perms == 0) {
834
835 /*
836 * The deny overrides the allow. Remove the allow.
837 */
838
839 DLIST_REMOVE(list_head, curr_ace);
840 SAFE_FREE(curr_ace);
841 curr_ace_outer_next = curr_ace_outer->next; /* We may have deleted the link. */
842
843 } else {
844
845 /*
846 * Even after removing permissions, there
847 * are still allow permissions - delete the deny.
848 * It is safe to delete the deny here,
849 * as we are guarenteed by the deny first
850 * ordering that all the deny entries for
851 * this SID have already been merged into one
852 * before we can get to an allow ace.
853 */
854
855 DLIST_REMOVE(list_head, curr_ace_outer);
856 SAFE_FREE(curr_ace_outer);
857 break;
858 }
859 }
860
861 } /* end for curr_ace */
862 } /* end for curr_ace_outer */
863
864 /* We may have modified the list. */
865
866 *pp_list_head = list_head;
867 }
868
869 /****************************************************************************
870 Check if we need to return NT4.x compatible ACL entries.
871 ****************************************************************************/
872
873 static bool nt4_compatible_acls(void)
874 {
875 int compat = lp_acl_compatibility();
876
877 if (compat == ACL_COMPAT_AUTO) {
878 enum remote_arch_types ra_type = get_remote_arch();
879
880 /* Automatically adapt to client */
881 return (ra_type <= RA_WINNT);
882 } else
883 return (compat == ACL_COMPAT_WINNT);
884 }
885
886
887 /****************************************************************************
888 Map canon_ace perms to permission bits NT.
889 The attr element is not used here - we only process deny entries on set,
890 not get. Deny entries are implicit on get with ace->perms = 0.
891 ****************************************************************************/
892
893 static SEC_ACCESS map_canon_ace_perms(int snum,
894 enum security_ace_type *pacl_type,
895 mode_t perms,
896 bool directory_ace)
897 {
898 SEC_ACCESS sa;
899 uint32 nt_mask = 0;
900
901 *pacl_type = SEC_ACE_TYPE_ACCESS_ALLOWED;
902
903 if (lp_acl_map_full_control(snum) && ((perms & ALL_ACE_PERMS) == ALL_ACE_PERMS)) {
904 if (directory_ace) {
905 nt_mask = UNIX_DIRECTORY_ACCESS_RWX;
906 } else {
907 nt_mask = (UNIX_ACCESS_RWX & ~DELETE_ACCESS);
908 }
909 } else if ((perms & ALL_ACE_PERMS) == (mode_t)0) {
910 /*
911 * Windows NT refuses to display ACEs with no permissions in them (but
912 * they are perfectly legal with Windows 2000). If the ACE has empty
913 * permissions we cannot use 0, so we use the otherwise unused
914 * WRITE_OWNER permission, which we ignore when we set an ACL.
915 * We abstract this into a #define of UNIX_ACCESS_NONE to allow this
916 * to be changed in the future.
917 */
918
919 if (nt4_compatible_acls())
920 nt_mask = UNIX_ACCESS_NONE;
921 else
922 nt_mask = 0;
923 } else {
924 if (directory_ace) {
925 nt_mask |= ((perms & S_IRUSR) ? UNIX_DIRECTORY_ACCESS_R : 0 );
926 nt_mask |= ((perms & S_IWUSR) ? UNIX_DIRECTORY_ACCESS_W : 0 );
927 nt_mask |= ((perms & S_IXUSR) ? UNIX_DIRECTORY_ACCESS_X : 0 );
928 } else {
929 nt_mask |= ((perms & S_IRUSR) ? UNIX_ACCESS_R : 0 );
930 nt_mask |= ((perms & S_IWUSR) ? UNIX_ACCESS_W : 0 );
931 nt_mask |= ((perms & S_IXUSR) ? UNIX_ACCESS_X : 0 );
932 }
933 }
934
935 DEBUG(10,("map_canon_ace_perms: Mapped (UNIX) %x to (NT) %x\n",
936 (unsigned int)perms, (unsigned int)nt_mask ));
937
938 init_sec_access(&sa,nt_mask);
939 return sa;
940 }
941
942 /****************************************************************************
943 Map NT perms to a UNIX mode_t.
944 ****************************************************************************/
945
946 #define FILE_SPECIFIC_READ_BITS (FILE_READ_DATA|FILE_READ_EA|FILE_READ_ATTRIBUTES)
947 #define FILE_SPECIFIC_WRITE_BITS (FILE_WRITE_DATA|FILE_APPEND_DATA|FILE_WRITE_EA|FILE_WRITE_ATTRIBUTES)
948 #define FILE_SPECIFIC_EXECUTE_BITS (FILE_EXECUTE)
949
950 static mode_t map_nt_perms( uint32 *mask, int type)
951 {
952 mode_t mode = 0;
953
954 switch(type) {
955 case S_IRUSR:
956 if((*mask) & GENERIC_ALL_ACCESS)
957 mode = S_IRUSR|S_IWUSR|S_IXUSR;
958 else {
959 mode |= ((*mask) & (GENERIC_READ_ACCESS|FILE_SPECIFIC_READ_BITS)) ? S_IRUSR : 0;
960 mode |= ((*mask) & (GENERIC_WRITE_ACCESS|FILE_SPECIFIC_WRITE_BITS)) ? S_IWUSR : 0;
961 mode |= ((*mask) & (GENERIC_EXECUTE_ACCESS|FILE_SPECIFIC_EXECUTE_BITS)) ? S_IXUSR : 0;
962 }
963 break;
964 case S_IRGRP:
965 if((*mask) & GENERIC_ALL_ACCESS)
966 mode = S_IRGRP|S_IWGRP|S_IXGRP;
967 else {
968 mode |= ((*mask) & (GENERIC_READ_ACCESS|FILE_SPECIFIC_READ_BITS)) ? S_IRGRP : 0;
969 mode |= ((*mask) & (GENERIC_WRITE_ACCESS|FILE_SPECIFIC_WRITE_BITS)) ? S_IWGRP : 0;
970 mode |= ((*mask) & (GENERIC_EXECUTE_ACCESS|FILE_SPECIFIC_EXECUTE_BITS)) ? S_IXGRP : 0;
971 }
972 break;
973 case S_IROTH:
974 if((*mask) & GENERIC_ALL_ACCESS)
975 mode = S_IROTH|S_IWOTH|S_IXOTH;
976 else {
977 mode |= ((*mask) & (GENERIC_READ_ACCESS|FILE_SPECIFIC_READ_BITS)) ? S_IROTH : 0;
978 mode |= ((*mask) & (GENERIC_WRITE_ACCESS|FILE_SPECIFIC_WRITE_BITS)) ? S_IWOTH : 0;
979 mode |= ((*mask) & (GENERIC_EXECUTE_ACCESS|FILE_SPECIFIC_EXECUTE_BITS)) ? S_IXOTH : 0;
980 }
981 break;
982 }
983
984 return mode;
985 }
986
987 /****************************************************************************
988 Unpack a SEC_DESC into a UNIX owner and group.
989 ****************************************************************************/
990
991 NTSTATUS unpack_nt_owners(int snum, uid_t *puser, gid_t *pgrp, uint32 security_info_sent, SEC_DESC *psd)
992 {
993 DOM_SID owner_sid;
994 DOM_SID grp_sid;
995
996 *puser = (uid_t)-1;
997 *pgrp = (gid_t)-1;
998
999 if(security_info_sent == 0) {
1000 DEBUG(0,("unpack_nt_owners: no security info sent !\n"));
1001 return NT_STATUS_OK;
1002 }
1003
1004 /*
1005 * Validate the owner and group SID's.
1006 */
1007
1008 memset(&owner_sid, '\0', sizeof(owner_sid));
1009 memset(&grp_sid, '\0', sizeof(grp_sid));
1010
1011 DEBUG(5,("unpack_nt_owners: validating owner_sids.\n"));
1012
1013 /*
1014 * Don't immediately fail if the owner sid cannot be validated.
1015 * This may be a group chown only set.
1016 */
1017
1018 if (security_info_sent & OWNER_SECURITY_INFORMATION) {
1019 sid_copy(&owner_sid, psd->owner_sid);
1020 if (!sid_to_uid(&owner_sid, puser)) {
1021 if (lp_force_unknown_acl_user(snum)) {
1022 /* this allows take ownership to work
1023 * reasonably */
1024 *puser = current_user.ut.uid;
1025 } else {
1026 DEBUG(3,("unpack_nt_owners: unable to validate"
1027 " owner sid for %s\n",
1028 sid_string_dbg(&owner_sid)));
1029 return NT_STATUS_INVALID_OWNER;
1030 }
1031 }
1032 DEBUG(3,("unpack_nt_owners: owner sid mapped to uid %u\n",
1033 (unsigned int)*puser ));
1034 }
1035
1036 /*
1037 * Don't immediately fail if the group sid cannot be validated.
1038 * This may be an owner chown only set.
1039 */
1040
1041 if (security_info_sent & GROUP_SECURITY_INFORMATION) {
1042 sid_copy(&grp_sid, psd->group_sid);
1043 if (!sid_to_gid( &grp_sid, pgrp)) {
1044 if (lp_force_unknown_acl_user(snum)) {
1045 /* this allows take group ownership to work
1046 * reasonably */
1047 *pgrp = current_user.ut.gid;
1048 } else {
1049 DEBUG(3,("unpack_nt_owners: unable to validate"
1050 " group sid.\n"));
1051 return NT_STATUS_INVALID_OWNER;
1052 }
1053 }
1054 DEBUG(3,("unpack_nt_owners: group sid mapped to gid %u\n",
1055 (unsigned int)*pgrp));
1056 }
1057
1058 DEBUG(5,("unpack_nt_owners: owner_sids validated.\n"));
1059
1060 return NT_STATUS_OK;
1061 }
1062
1063 /****************************************************************************
1064 Ensure the enforced permissions for this share apply.
1065 ****************************************************************************/
1066
1067 static void apply_default_perms(const struct share_params *params,
1068 const bool is_directory, canon_ace *pace,
1069 mode_t type)
1070 {
1071 mode_t and_bits = (mode_t)0;
1072 mode_t or_bits = (mode_t)0;
1073
1074 /* Get the initial bits to apply. */
1075
1076 if (is_directory) {
1077 and_bits = lp_dir_security_mask(params->service);
1078 or_bits = lp_force_dir_security_mode(params->service);
1079 } else {
1080 and_bits = lp_security_mask(params->service);
1081 or_bits = lp_force_security_mode(params->service);
1082 }
1083
1084 /* Now bounce them into the S_USR space. */
1085 switch(type) {
1086 case S_IRUSR:
1087 /* Ensure owner has read access. */
1088 pace->perms |= S_IRUSR;
1089 if (is_directory)
1090 pace->perms |= (S_IWUSR|S_IXUSR);
1091 and_bits = unix_perms_to_acl_perms(and_bits, S_IRUSR, S_IWUSR, S_IXUSR);
1092 or_bits = unix_perms_to_acl_perms(or_bits, S_IRUSR, S_IWUSR, S_IXUSR);
1093 break;
1094 case S_IRGRP:
1095 and_bits = unix_perms_to_acl_perms(and_bits, S_IRGRP, S_IWGRP, S_IXGRP);
1096 or_bits = unix_perms_to_acl_perms(or_bits, S_IRGRP, S_IWGRP, S_IXGRP);
1097 break;
1098 case S_IROTH:
1099 and_bits = unix_perms_to_acl_perms(and_bits, S_IROTH, S_IWOTH, S_IXOTH);
1100 or_bits = unix_perms_to_acl_perms(or_bits, S_IROTH, S_IWOTH, S_IXOTH);
1101 break;
1102 }
1103
1104 pace->perms = ((pace->perms & and_bits)|or_bits);
1105 }
1106
1107 /****************************************************************************
1108 Check if a given uid/SID is in a group gid/SID. This is probably very
1109 expensive and will need optimisation. A *lot* of optimisation :-). JRA.
1110 ****************************************************************************/
1111
1112 static bool uid_entry_in_group( canon_ace *uid_ace, canon_ace *group_ace )
1113 {
1114 const char *u_name = NULL;
1115
1116 /* "Everyone" always matches every uid. */
1117
1118 if (sid_equal(&group_ace->trustee, &global_sid_World))
1119 return True;
1120
1121 /* Assume that the current user is in the current group (force group) */
1122
1123 if (uid_ace->unix_ug.uid == current_user.ut.uid && group_ace->unix_ug.gid == current_user.ut.gid)
1124 return True;
1125
1126 /* u_name talloc'ed off tos. */
1127 u_name = uidtoname(uid_ace->unix_ug.uid);
1128 if (!u_name) {
1129 return False;
1130 }
1131 return user_in_group_sid(u_name, &group_ace->trustee);
1132 }
1133
1134 /****************************************************************************
1135 A well formed POSIX file or default ACL has at least 3 entries, a
1136 SMB_ACL_USER_OBJ, SMB_ACL_GROUP_OBJ, SMB_ACL_OTHER_OBJ.
1137 In addition, the owner must always have at least read access.
1138 When using this call on get_acl, the pst struct is valid and contains
1139 the mode of the file. When using this call on set_acl, the pst struct has
1140 been modified to have a mode containing the default for this file or directory
1141 type.
1142 ****************************************************************************/
1143
1144 static bool ensure_canon_entry_valid(canon_ace **pp_ace,
1145 const struct share_params *params,
1146 const bool is_directory,
1147 const DOM_SID *pfile_owner_sid,
1148 const DOM_SID *pfile_grp_sid,
1149 const SMB_STRUCT_STAT *pst,
1150 bool setting_acl)
1151 {
1152 canon_ace *pace;
1153 bool got_user = False;
1154 bool got_grp = False;
1155 bool got_other = False;
1156 canon_ace *pace_other = NULL;
1157
1158 for (pace = *pp_ace; pace; pace = pace->next) {
1159 if (pace->type == SMB_ACL_USER_OBJ) {
1160
1161 if (setting_acl)
1162 apply_default_perms(params, is_directory, pace, S_IRUSR);
1163 got_user = True;
1164
1165 } else if (pace->type == SMB_ACL_GROUP_OBJ) {
1166
1167 /*
1168 * Ensure create mask/force create mode is respected on set.
1169 */
1170
1171 if (setting_acl)
1172 apply_default_perms(params, is_directory, pace, S_IRGRP);
1173 got_grp = True;
1174
1175 } else if (pace->type == SMB_ACL_OTHER) {
1176
1177 /*
1178 * Ensure create mask/force create mode is respected on set.
1179 */
1180
1181 if (setting_acl)
1182 apply_default_perms(params, is_directory, pace, S_IROTH);
1183 got_other = True;
1184 pace_other = pace;
1185 }
1186 }
1187
1188 if (!got_user) {
1189 if ((pace = SMB_MALLOC_P(canon_ace)) == NULL) {
1190 DEBUG(0,("ensure_canon_entry_valid: malloc fail.\n"));
1191 return False;
1192 }
1193
1194 ZERO_STRUCTP(pace);
1195 pace->type = SMB_ACL_USER_OBJ;
1196 pace->owner_type = UID_ACE;
1197 pace->unix_ug.uid = pst->st_uid;
1198 pace->trustee = *pfile_owner_sid;
1199 pace->attr = ALLOW_ACE;
1200
1201 if (setting_acl) {
1202 /* See if the owning user is in any of the other groups in
1203 the ACE. If so, OR in the permissions from that group. */
1204
1205 bool group_matched = False;
1206 canon_ace *pace_iter;
1207
1208 for (pace_iter = *pp_ace; pace_iter; pace_iter = pace_iter->next) {
1209 if (pace_iter->type == SMB_ACL_GROUP_OBJ || pace_iter->type == SMB_ACL_GROUP) {
1210 if (uid_entry_in_group(pace, pace_iter)) {
1211 pace->perms |= pace_iter->perms;
1212 group_matched = True;
1213 }
1214 }
1215 }
1216
1217 /* If we only got an "everyone" perm, just use that. */
1218 if (!group_matched) {
1219 if (got_other)
1220 pace->perms = pace_other->perms;
1221 else
1222 pace->perms = 0;
1223 }
1224
1225 apply_default_perms(params, is_directory, pace, S_IRUSR);
1226 } else {
1227 pace->perms = unix_perms_to_acl_perms(pst->st_mode, S_IRUSR, S_IWUSR, S_IXUSR);
1228 }
1229
1230 DLIST_ADD(*pp_ace, pace);
1231 }
1232
1233 if (!got_grp) {
1234 if ((pace = SMB_MALLOC_P(canon_ace)) == NULL) {
1235 DEBUG(0,("ensure_canon_entry_valid: malloc fail.\n"));
1236 return False;
1237 }
1238
1239 ZERO_STRUCTP(pace);
1240 pace->type = SMB_ACL_GROUP_OBJ;
1241 pace->owner_type = GID_ACE;
1242 pace->unix_ug.uid = pst->st_gid;
1243 pace->trustee = *pfile_grp_sid;
1244 pace->attr = ALLOW_ACE;
1245 if (setting_acl) {
1246 /* If we only got an "everyone" perm, just use that. */
1247 if (got_other)
1248 pace->perms = pace_other->perms;
1249 else
1250 pace->perms = 0;
1251 apply_default_perms(params, is_directory, pace, S_IRGRP);
1252 } else {
1253 pace->perms = unix_perms_to_acl_perms(pst->st_mode, S_IRGRP, S_IWGRP, S_IXGRP);
1254 }
1255
1256 DLIST_ADD(*pp_ace, pace);
1257 }
1258
1259 if (!got_other) {
1260 if ((pace = SMB_MALLOC_P(canon_ace)) == NULL) {
1261 DEBUG(0,("ensure_canon_entry_valid: malloc fail.\n"));
1262 return False;
1263 }
1264
1265 ZERO_STRUCTP(pace);
1266 pace->type = SMB_ACL_OTHER;
1267 pace->owner_type = WORLD_ACE;
1268 pace->unix_ug.world = -1;
1269 pace->trustee = global_sid_World;
1270 pace->attr = ALLOW_ACE;
1271 if (setting_acl) {
1272 pace->perms = 0;
1273 apply_default_perms(params, is_directory, pace, S_IROTH);
1274 } else
1275 pace->perms = unix_perms_to_acl_perms(pst->st_mode, S_IROTH, S_IWOTH, S_IXOTH);
1276
1277 DLIST_ADD(*pp_ace, pace);
1278 }
1279
1280 return True;
1281 }
1282
1283 /****************************************************************************
1284 Check if a POSIX ACL has the required SMB_ACL_USER_OBJ and SMB_ACL_GROUP_OBJ entries.
1285 If it does not have them, check if there are any entries where the trustee is the
1286 file owner or the owning group, and map these to SMB_ACL_USER_OBJ and SMB_ACL_GROUP_OBJ.
1287 ****************************************************************************/
1288
1289 static void check_owning_objs(canon_ace *ace, DOM_SID *pfile_owner_sid, DOM_SID *pfile_grp_sid)
1290 {
1291 bool got_user_obj, got_group_obj;
1292 canon_ace *current_ace;
1293 int i, entries;
1294
1295 entries = count_canon_ace_list(ace);
1296 got_user_obj = False;
1297 got_group_obj = False;
1298
1299 for (i=0, current_ace = ace; i < entries; i++, current_ace = current_ace->next) {
1300 if (current_ace->type == SMB_ACL_USER_OBJ)
1301 got_user_obj = True;
1302 else if (current_ace->type == SMB_ACL_GROUP_OBJ)
1303 got_group_obj = True;
1304 }
1305 if (got_user_obj && got_group_obj) {
1306 DEBUG(10,("check_owning_objs: ACL had owning user/group entries.\n"));
1307 return;
1308 }
1309
1310 for (i=0, current_ace = ace; i < entries; i++, current_ace = current_ace->next) {
1311 if (!got_user_obj && current_ace->owner_type == UID_ACE &&
1312 sid_equal(&current_ace->trustee, pfile_owner_sid)) {
1313 current_ace->type = SMB_ACL_USER_OBJ;
1314 got_user_obj = True;
1315 }
1316 if (!got_group_obj && current_ace->owner_type == GID_ACE &&
1317 sid_equal(&current_ace->trustee, pfile_grp_sid)) {
1318 current_ace->type = SMB_ACL_GROUP_OBJ;
1319 got_group_obj = True;
1320 }
1321 }
1322 if (!got_user_obj)
1323 DEBUG(10,("check_owning_objs: ACL is missing an owner entry.\n"));
1324 if (!got_group_obj)
1325 DEBUG(10,("check_owning_objs: ACL is missing an owning group entry.\n"));
1326 }
1327
1328 /****************************************************************************
1329 Unpack a SEC_DESC into two canonical ace lists.
1330 ****************************************************************************/
1331
1332 static bool create_canon_ace_lists(files_struct *fsp, SMB_STRUCT_STAT *pst,
1333 DOM_SID *pfile_owner_sid,
1334 DOM_SID *pfile_grp_sid,
1335 canon_ace **ppfile_ace, canon_ace **ppdir_ace,
1336 SEC_ACL *dacl)
1337 {
1338 bool all_aces_are_inherit_only = (fsp->is_directory ? True : False);
1339 canon_ace *file_ace = NULL;
1340 canon_ace *dir_ace = NULL;
1341 canon_ace *current_ace = NULL;
1342 bool got_dir_allow = False;
1343 bool got_file_allow = False;
1344 int i, j;
1345
1346 *ppfile_ace = NULL;
1347 *ppdir_ace = NULL;
1348
1349 /*
1350 * Convert the incoming ACL into a more regular form.
1351 */
1352
1353 for(i = 0; i < dacl->num_aces; i++) {
1354 SEC_ACE *psa = &dacl->aces[i];
1355
1356 if((psa->type != SEC_ACE_TYPE_ACCESS_ALLOWED) && (psa->type != SEC_ACE_TYPE_ACCESS_DENIED)) {
1357 DEBUG(3,("create_canon_ace_lists: unable to set anything but an ALLOW or DENY ACE.\n"));
1358 return False;
1359 }
1360
1361 if (nt4_compatible_acls()) {
1362 /*
1363 * The security mask may be UNIX_ACCESS_NONE which should map into
1364 * no permissions (we overload the WRITE_OWNER bit for this) or it
1365 * should be one of the ALL/EXECUTE/READ/WRITE bits. Arrange for this
1366 * to be so. Any other bits override the UNIX_ACCESS_NONE bit.
1367 */
1368
1369 /*
1370 * Convert GENERIC bits to specific bits.
1371 */
1372
1373 se_map_generic(&psa->access_mask, &file_generic_mapping);
1374
1375 psa->access_mask &= (UNIX_ACCESS_NONE|FILE_ALL_ACCESS);
1376
1377 if(psa->access_mask != UNIX_ACCESS_NONE)
1378 psa->access_mask &= ~UNIX_ACCESS_NONE;
1379 }
1380 }
1381
1382 /*
1383 * Deal with the fact that NT 4.x re-writes the canonical format
1384 * that we return for default ACLs. If a directory ACE is identical
1385 * to a inherited directory ACE then NT changes the bits so that the
1386 * first ACE is set to OI|IO and the second ACE for this SID is set
1387 * to CI. We need to repair this. JRA.
1388 */
1389
1390 for(i = 0; i < dacl->num_aces; i++) {
1391 SEC_ACE *psa1 = &dacl->aces[i];
1392
1393 for (j = i + 1; j < dacl->num_aces; j++) {
1394 SEC_ACE *psa2 = &dacl->aces[j];
1395
1396 if (psa1->access_mask != psa2->access_mask)
1397 continue;
1398
1399 if (!sid_equal(&psa1->trustee, &psa2->trustee))
1400 continue;
1401
1402 /*
1403 * Ok - permission bits and SIDs are equal.
1404 * Check if flags were re-written.
1405 */
1406
1407 if (psa1->flags & SEC_ACE_FLAG_INHERIT_ONLY) {
1408
1409 psa1->flags |= (psa2->flags & (SEC_ACE_FLAG_CONTAINER_INHERIT|SEC_ACE_FLAG_OBJECT_INHERIT));
1410 psa2->flags &= ~(SEC_ACE_FLAG_CONTAINER_INHERIT|SEC_ACE_FLAG_OBJECT_INHERIT);
1411
1412 } else if (psa2->flags & SEC_ACE_FLAG_INHERIT_ONLY) {
1413
1414 psa2->flags |= (psa1->flags & (SEC_ACE_FLAG_CONTAINER_INHERIT|SEC_ACE_FLAG_OBJECT_INHERIT));
1415 psa1->flags &= ~(SEC_ACE_FLAG_CONTAINER_INHERIT|SEC_ACE_FLAG_OBJECT_INHERIT);
1416
1417 }
1418 }
1419 }
1420
1421 for(i = 0; i < dacl->num_aces; i++) {
1422 SEC_ACE *psa = &dacl->aces[i];
1423
1424 /*
1425 * Create a cannon_ace entry representing this NT DACL ACE.
1426 */
1427
1428 if ((current_ace = SMB_MALLOC_P(canon_ace)) == NULL) {
1429 free_canon_ace_list(file_ace);
1430 free_canon_ace_list(dir_ace);
1431 DEBUG(0,("create_canon_ace_lists: malloc fail.\n"));
1432 return False;
1433 }
1434
1435 ZERO_STRUCTP(current_ace);
1436
1437 sid_copy(&current_ace->trustee, &psa->trustee);
1438
1439 /*
1440 * Try and work out if the SID is a user or group
1441 * as we need to flag these differently for POSIX.
1442 * Note what kind of a POSIX ACL this should map to.
1443 */
1444
1445 if( sid_equal(&current_ace->trustee, &global_sid_World)) {
1446 current_ace->owner_type = WORLD_ACE;
1447 current_ace->unix_ug.world = -1;
1448 current_ace->type = SMB_ACL_OTHER;
1449 } else if (sid_equal(&current_ace->trustee, &global_sid_Creator_Owner)) {
1450 current_ace->owner_type = UID_ACE;
1451 current_ace->unix_ug.uid = pst->st_uid;
1452 current_ace->type = SMB_ACL_USER_OBJ;
1453
1454 /*
1455 * The Creator Owner entry only specifies inheritable permissions,
1456 * never access permissions. WinNT doesn't always set the ACE to
1457 *INHERIT_ONLY, though.
1458 */
1459
1460 if (nt4_compatible_acls())
1461 psa->flags |= SEC_ACE_FLAG_INHERIT_ONLY;
1462 } else if (sid_equal(&current_ace->trustee, &global_sid_Creator_Group)) {
1463 current_ace->owner_type = GID_ACE;
1464 current_ace->unix_ug.gid = pst->st_gid;
1465 current_ace->type = SMB_ACL_GROUP_OBJ;
1466
1467 /*
1468 * The Creator Group entry only specifies inheritable permissions,
1469 * never access permissions. WinNT doesn't always set the ACE to
1470 *INHERIT_ONLY, though.
1471 */
1472 if (nt4_compatible_acls())
1473 psa->flags |= SEC_ACE_FLAG_INHERIT_ONLY;
1474
1475 } else if (sid_to_uid( &current_ace->trustee, &current_ace->unix_ug.uid)) {
1476 current_ace->owner_type = UID_ACE;
1477 /* If it's the owning user, this is a user_obj, not
1478 * a user. */
1479 if (current_ace->unix_ug.uid == pst->st_uid) {
1480 current_ace->type = SMB_ACL_USER_OBJ;
1481 } else {
1482 current_ace->type = SMB_ACL_USER;
1483 }
1484 } else if (sid_to_gid( &current_ace->trustee, &current_ace->unix_ug.gid)) {
1485 current_ace->owner_type = GID_ACE;
1486 /* If it's the primary group, this is a group_obj, not
1487 * a group. */
1488 if (current_ace->unix_ug.gid == pst->st_gid) {
1489 current_ace->type = SMB_ACL_GROUP_OBJ;
1490 } else {
1491 current_ace->type = SMB_ACL_GROUP;
1492 }
1493 } else {
1494 /*
1495 * Silently ignore map failures in non-mappable SIDs (NT Authority, BUILTIN etc).
1496 */
1497
1498 if (non_mappable_sid(&psa->trustee)) {
1499 DEBUG(10, ("create_canon_ace_lists: ignoring "
1500 "non-mappable SID %s\n",
1501 sid_string_dbg(&psa->trustee)));
1502 SAFE_FREE(current_ace);
1503 continue;
1504 }
1505
1506 free_canon_ace_list(file_ace);
1507 free_canon_ace_list(dir_ace);
1508 DEBUG(0, ("create_canon_ace_lists: unable to map SID "
1509 "%s to uid or gid.\n",
1510 sid_string_dbg(&current_ace->trustee)));
1511 SAFE_FREE(current_ace);
1512 return False;
1513 }
1514
1515 /*
1516 * Map the given NT permissions into a UNIX mode_t containing only
1517 * S_I(R|W|X)USR bits.
1518 */
1519
1520 current_ace->perms |= map_nt_perms( &psa->access_mask, S_IRUSR);
1521 current_ace->attr = (psa->type == SEC_ACE_TYPE_ACCESS_ALLOWED) ? ALLOW_ACE : DENY_ACE;
1522 current_ace->inherited = ((psa->flags & SEC_ACE_FLAG_INHERITED_ACE) ? True : False);
1523
1524 /*
1525 * Now add the created ace to either the file list, the directory
1526 * list, or both. We *MUST* preserve the order here (hence we use
1527 * DLIST_ADD_END) as NT ACLs are order dependent.
1528 */
1529
1530 if (fsp->is_directory) {
1531
1532 /*
1533 * We can only add to the default POSIX ACE list if the ACE is
1534 * designed to be inherited by both files and directories.
1535 */
1536
1537 if ((psa->flags & (SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT)) ==
1538 (SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT)) {
1539
1540 DLIST_ADD_END(dir_ace, current_ace, canon_ace *);
1541
1542 /*
1543 * Note if this was an allow ace. We can't process
1544 * any further deny ace's after this.
1545 */
1546
1547 if (current_ace->attr == ALLOW_ACE)
1548 got_dir_allow = True;
1549
1550 if ((current_ace->attr == DENY_ACE) && got_dir_allow) {
1551 DEBUG(0,("create_canon_ace_lists: malformed ACL in inheritable ACL ! \
1552 Deny entry after Allow entry. Failing to set on file %s.\n", fsp->fsp_name ));
1553 free_canon_ace_list(file_ace);
1554 free_canon_ace_list(dir_ace);
1555 return False;
1556 }
1557
1558 if( DEBUGLVL( 10 )) {
1559 dbgtext("create_canon_ace_lists: adding dir ACL:\n");
1560 print_canon_ace( current_ace, 0);
1561 }
1562
1563 /*
1564 * If this is not an inherit only ACE we need to add a duplicate
1565 * to the file acl.
1566 */
1567
1568 if (!(psa->flags & SEC_ACE_FLAG_INHERIT_ONLY)) {
1569 canon_ace *dup_ace = dup_canon_ace(current_ace);
1570
1571 if (!dup_ace) {
1572 DEBUG(0,("create_canon_ace_lists: malloc fail !\n"));
1573 free_canon_ace_list(file_ace);
1574 free_canon_ace_list(dir_ace);
1575 return False;
1576 }
1577
1578 /*
1579 * We must not free current_ace here as its
1580 * pointer is now owned by the dir_ace list.
1581 */
1582 current_ace = dup_ace;
1583 } else {
1584 /*
1585 * We must not free current_ace here as its
1586 * pointer is now owned by the dir_ace list.
1587 */
1588 current_ace = NULL;
1589 }
1590 }
1591 }
1592
1593 /*
1594 * Only add to the file ACL if not inherit only.
1595 */
1596
1597 if (current_ace && !(psa->flags & SEC_ACE_FLAG_INHERIT_ONLY)) {
1598 DLIST_ADD_END(file_ace, current_ace, canon_ace *);
1599
1600 /*
1601 * Note if this was an allow ace. We can't process
1602 * any further deny ace's after this.
1603 */
1604
1605 if (current_ace->attr == ALLOW_ACE)
1606 got_file_allow = True;
1607
1608 if ((current_ace->attr == DENY_ACE) && got_file_allow) {
1609 DEBUG(0,("create_canon_ace_lists: malformed ACL in file ACL ! \
1610 Deny entry after Allow entry. Failing to set on file %s.\n", fsp->fsp_name ));
1611 free_canon_ace_list(file_ace);
1612 free_canon_ace_list(dir_ace);
1613 return False;
1614 }
1615
1616 if( DEBUGLVL( 10 )) {
1617 dbgtext("create_canon_ace_lists: adding file ACL:\n");
1618 print_canon_ace( current_ace, 0);
1619 }
1620 all_aces_are_inherit_only = False;
1621 /*
1622 * We must not free current_ace here as its
1623 * pointer is now owned by the file_ace list.
1624 */
1625 current_ace = NULL;
1626 }
1627
1628 /*
1629 * Free if ACE was not added.
1630 */
1631
1632 SAFE_FREE(current_ace);
1633 }
1634
1635 if (fsp->is_directory && all_aces_are_inherit_only) {
1636 /*
1637 * Windows 2000 is doing one of these weird 'inherit acl'
1638 * traverses to conserve NTFS ACL resources. Just pretend
1639 * there was no DACL sent. JRA.
1640 */
1641
1642 DEBUG(10,("create_canon_ace_lists: Win2k inherit acl traverse. Ignoring DACL.\n"));
1643 free_canon_ace_list(file_ace);
1644 free_canon_ace_list(dir_ace);
1645 file_ace = NULL;
1646 dir_ace = NULL;
1647 } else {
1648 /*
1649 * Check if we have SMB_ACL_USER_OBJ and SMB_ACL_GROUP_OBJ entries in each
1650 * ACL. If we don't have them, check if any SMB_ACL_USER/SMB_ACL_GROUP
1651 * entries can be converted to *_OBJ. Usually we will already have these
1652 * entries in the Default ACL, and the Access ACL will not have them.
1653 */
1654 if (file_ace) {
1655 check_owning_objs(file_ace, pfile_owner_sid, pfile_grp_sid);
1656 }
1657 if (dir_ace) {
1658 check_owning_objs(dir_ace, pfile_owner_sid, pfile_grp_sid);
1659 }
1660 }
1661
1662 *ppfile_ace = file_ace;
1663 *ppdir_ace = dir_ace;
1664
1665 return True;
1666 }
1667
1668 /****************************************************************************
1669 ASCII art time again... JRA :-).
1670
1671 We have 4 cases to process when moving from an NT ACL to a POSIX ACL. Firstly,
1672 we insist the ACL is in canonical form (ie. all DENY entries preceede ALLOW
1673 entries). Secondly, the merge code has ensured that all duplicate SID entries for
1674 allow or deny have been merged, so the same SID can only appear once in the deny
1675 list or once in the allow list.
1676
1677 We then process as follows :
1678
1679 ---------------------------------------------------------------------------
1680 First pass - look for a Everyone DENY entry.
1681
1682 If it is deny all (rwx) trunate the list at this point.
1683 Else, walk the list from this point and use the deny permissions of this
1684 entry as a mask on all following allow entries. Finally, delete
1685 the Everyone DENY entry (we have applied it to everything possible).
1686
1687 In addition, in this pass we remove any DENY entries that have
1688 no permissions (ie. they are a DENY nothing).
1689 ---------------------------------------------------------------------------
1690 Second pass - only deal with deny user entries.
1691
1692 DENY user1 (perms XXX)
1693
1694 new_perms = 0
1695 for all following allow group entries where user1 is in group
1696 new_perms |= group_perms;
1697
1698 user1 entry perms = new_perms & ~ XXX;
1699
1700 Convert the deny entry to an allow entry with the new perms and
1701 push to the end of the list. Note if the user was in no groups
1702 this maps to a specific allow nothing entry for this user.
1703
1704 The common case from the NT ACL choser (userX deny all) is
1705 optimised so we don't do the group lookup - we just map to
1706 an allow nothing entry.
1707
1708 What we're doing here is inferring the allow permissions the
1709 person setting the ACE on user1 wanted by looking at the allow
1710 permissions on the groups the user is currently in. This will
1711 be a snapshot, depending on group membership but is the best
1712 we can do and has the advantage of failing closed rather than
1713 open.
1714 ---------------------------------------------------------------------------
1715 Third pass - only deal with deny group entries.
1716
1717 DENY group1 (perms XXX)
1718
1719 for all following allow user entries where user is in group1
1720 user entry perms = user entry perms & ~ XXX;
1721
1722 If there is a group Everyone allow entry with permissions YYY,
1723 convert the group1 entry to an allow entry and modify its
1724 permissions to be :
1725
1726 new_perms = YYY & ~ XXX
1727
1728 and push to the end of the list.
1729
1730 If there is no group Everyone allow entry then convert the
1731 group1 entry to a allow nothing entry and push to the end of the list.
1732
1733 Note that the common case from the NT ACL choser (groupX deny all)
1734 cannot be optimised here as we need to modify user entries who are
1735 in the group to change them to a deny all also.
1736
1737 What we're doing here is modifying the allow permissions of
1738 user entries (which are more specific in POSIX ACLs) to mask
1739 out the explicit deny set on the group they are in. This will
1740 be a snapshot depending on current group membership but is the
1741 best we can do and has the advantage of failing closed rather
1742 than open.
1743 ---------------------------------------------------------------------------
1744 Fourth pass - cope with cumulative permissions.
1745
1746 for all allow user entries, if there exists an allow group entry with
1747 more permissive permissions, and the user is in that group, rewrite the
1748 allow user permissions to contain both sets of permissions.
1749
1750 Currently the code for this is #ifdef'ed out as these semantics make
1751 no sense to me. JRA.
1752 ---------------------------------------------------------------------------
1753
1754 Note we *MUST* do the deny user pass first as this will convert deny user
1755 entries into allow user entries which can then be processed by the deny
1756 group pass.
1757
1758 The above algorithm took a *lot* of thinking about - hence this
1759 explaination :-). JRA.
1760 ****************************************************************************/
1761
1762 /****************************************************************************
1763 Process a canon_ace list entries. This is very complex code. We need
1764 to go through and remove the "deny" permissions from any allow entry that matches
1765 the id of this entry. We have already refused any NT ACL that wasn't in correct
1766 order (DENY followed by ALLOW). If any allow entry ends up with zero permissions,
1767 we just remove it (to fail safe). We have already removed any duplicate ace
1768 entries. Treat an "Everyone" DENY_ACE as a special case - use it to mask all
1769 allow entries.
1770 ****************************************************************************/
1771
1772 static void process_deny_list( canon_ace **pp_ace_list )
1773 {
1774 canon_ace *ace_list = *pp_ace_list;
1775 canon_ace *curr_ace = NULL;
1776 canon_ace *curr_ace_next = NULL;
1777
1778 /* Pass 1 above - look for an Everyone, deny entry. */
1779
1780 for (curr_ace = ace_list; curr_ace; curr_ace = curr_ace_next) {
1781 canon_ace *allow_ace_p;
1782
1783 curr_ace_next = curr_ace->next; /* So we can't lose the link. */
1784
1785 if (curr_ace->attr != DENY_ACE)
1786 continue;
1787
1788 if (curr_ace->perms == (mode_t)0) {
1789
1790 /* Deny nothing entry - delete. */
1791
1792 DLIST_REMOVE(ace_list, curr_ace);
1793 continue;
1794 }
1795
1796 if (!sid_equal(&curr_ace->trustee, &global_sid_World))
1797 continue;
1798
1799 /* JRATEST - assert. */
1800 SMB_ASSERT(curr_ace->owner_type == WORLD_ACE);
1801
1802 if (curr_ace->perms == ALL_ACE_PERMS) {
1803
1804 /*
1805 * Optimisation. This is a DENY_ALL to Everyone. Truncate the
1806 * list at this point including this entry.
1807 */
1808
1809 canon_ace *prev_entry = curr_ace->prev;
1810
1811 free_canon_ace_list( curr_ace );
1812 if (prev_entry)
1813 prev_entry->next = NULL;
1814 else {
1815 /* We deleted the entire list. */
1816 ace_list = NULL;
1817 }
1818 break;
1819 }
1820
1821 for (allow_ace_p = curr_ace->next; allow_ace_p; allow_ace_p = allow_ace_p->next) {
1822
1823 /*
1824 * Only mask off allow entries.
1825 */
1826
1827 if (allow_ace_p->attr != ALLOW_ACE)
1828 continue;
1829
1830 allow_ace_p->perms &= ~curr_ace->perms;
1831 }
1832
1833 /*
1834 * Now it's been applied, remove it.
1835 */
1836
1837 DLIST_REMOVE(ace_list, curr_ace);
1838 }
1839
1840 /* Pass 2 above - deal with deny user entries. */
1841
1842 for (curr_ace = ace_list; curr_ace; curr_ace = curr_ace_next) {
1843 mode_t new_perms = (mode_t)0;
1844 canon_ace *allow_ace_p;
1845
1846 curr_ace_next = curr_ace->next; /* So we can't lose the link. */
1847
1848 if (curr_ace->attr != DENY_ACE)
1849 continue;
1850
1851 if (curr_ace->owner_type != UID_ACE)
1852 continue;
1853
1854 if (curr_ace->perms == ALL_ACE_PERMS) {
1855
1856 /*
1857 * Optimisation - this is a deny everything to this user.
1858 * Convert to an allow nothing and push to the end of the list.
1859 */
1860
1861 curr_ace->attr = ALLOW_ACE;
1862 curr_ace->perms = (mode_t)0;
1863 DLIST_DEMOTE(ace_list, curr_ace, canon_ace *);
1864 continue;
1865 }
1866
1867 for (allow_ace_p = curr_ace->next; allow_ace_p; allow_ace_p = allow_ace_p->next) {
1868
1869 if (allow_ace_p->attr != ALLOW_ACE)
1870 continue;
1871
1872 /* We process GID_ACE and WORLD_ACE entries only. */
1873
1874 if (allow_ace_p->owner_type == UID_ACE)
1875 continue;
1876
1877 if (uid_entry_in_group( curr_ace, allow_ace_p))
1878 new_perms |= allow_ace_p->perms;
1879 }
1880
1881 /*
1882 * Convert to a allow entry, modify the perms and push to the end
1883 * of the list.
1884 */
1885
1886 curr_ace->attr = ALLOW_ACE;
1887 curr_ace->perms = (new_perms & ~curr_ace->perms);
1888 DLIST_DEMOTE(ace_list, curr_ace, canon_ace *);
1889 }
1890
1891 /* Pass 3 above - deal with deny group entries. */
1892
1893 for (curr_ace = ace_list; curr_ace; curr_ace = curr_ace_next) {
1894 canon_ace *allow_ace_p;
1895 canon_ace *allow_everyone_p = NULL;
1896
1897 curr_ace_next = curr_ace->next; /* So we can't lose the link. */
1898
1899 if (curr_ace->attr != DENY_ACE)
1900 continue;
1901
1902 if (curr_ace->owner_type != GID_ACE)
1903 continue;
1904
1905 for (allow_ace_p = curr_ace->next; allow_ace_p; allow_ace_p = allow_ace_p->next) {
1906
1907 if (allow_ace_p->attr != ALLOW_ACE)
1908 continue;
1909
1910 /* Store a pointer to the Everyone allow, if it exists. */
1911 if (allow_ace_p->owner_type == WORLD_ACE)
1912 allow_everyone_p = allow_ace_p;
1913
1914 /* We process UID_ACE entries only. */
1915
1916 if (allow_ace_p->owner_type != UID_ACE)
1917 continue;
1918
1919 /* Mask off the deny group perms. */
1920
1921 if (uid_entry_in_group( allow_ace_p, curr_ace))
1922 allow_ace_p->perms &= ~curr_ace->perms;
1923 }
1924
1925 /*
1926 * Convert the deny to an allow with the correct perms and
1927 * push to the end of the list.
1928 */
1929
1930 curr_ace->attr = ALLOW_ACE;
1931 if (allow_everyone_p)
1932 curr_ace->perms = allow_everyone_p->perms & ~curr_ace->perms;
1933 else
1934 curr_ace->perms = (mode_t)0;
1935 DLIST_DEMOTE(ace_list, curr_ace, canon_ace *);
1936 }
1937
1938 /* Doing this fourth pass allows Windows semantics to be layered
1939 * on top of POSIX semantics. I'm not sure if this is desirable.
1940 * For example, in W2K ACLs there is no way to say, "Group X no
1941 * access, user Y full access" if user Y is a member of group X.
1942 * This seems completely broken semantics to me.... JRA.
1943 */
1944
1945 #if 0
1946 /* Pass 4 above - deal with allow entries. */
1947
1948 for (curr_ace = ace_list; curr_ace; curr_ace = curr_ace_next) {
1949 canon_ace *allow_ace_p;
1950
1951 curr_ace_next = curr_ace->next; /* So we can't lose the link. */
1952
1953 if (curr_ace->attr != ALLOW_ACE)
1954 continue;
1955
1956 if (curr_ace->owner_type != UID_ACE)
1957 continue;
1958
1959 for (allow_ace_p = ace_list; allow_ace_p; allow_ace_p = allow_ace_p->next) {
1960
1961 if (allow_ace_p->attr != ALLOW_ACE)
1962 continue;
1963
1964 /* We process GID_ACE entries only. */
1965
1966 if (allow_ace_p->owner_type != GID_ACE)
1967 continue;
1968
1969 /* OR in the group perms. */
1970
1971 if (uid_entry_in_group( curr_ace, allow_ace_p))
1972 curr_ace->perms |= allow_ace_p->perms;
1973 }
1974 }
1975 #endif
1976
1977 *pp_ace_list = ace_list;
1978 }
1979
1980 /****************************************************************************
1981 Create a default mode that will be used if a security descriptor entry has
1982 no user/group/world entries.
1983 ****************************************************************************/
1984
1985 static mode_t create_default_mode(files_struct *fsp, bool interitable_mode)
1986 {
1987 int snum = SNUM(fsp->conn);
1988 mode_t and_bits = (mode_t)0;
1989 mode_t or_bits = (mode_t)0;
1990 mode_t mode = interitable_mode
1991 ? unix_mode( fsp->conn, FILE_ATTRIBUTE_ARCHIVE, fsp->fsp_name,
1992 NULL )
1993 : S_IRUSR;
1994
1995 if (fsp->is_directory)
1996 mode |= (S_IWUSR|S_IXUSR);
1997
1998 /*
1999 * Now AND with the create mode/directory mode bits then OR with the
2000 * force create mode/force directory mode bits.
2001 */
2002
2003 if (fsp->is_directory) {
2004 and_bits = lp_dir_security_mask(snum);
2005 or_bits = lp_force_dir_security_mode(snum);
2006 } else {
2007 and_bits = lp_security_mask(snum);
2008 or_bits = lp_force_security_mode(snum);
2009 }
2010
2011 return ((mode & and_bits)|or_bits);
2012 }
2013
2014 /****************************************************************************
2015 Unpack a SEC_DESC into two canonical ace lists. We don't depend on this
2016 succeeding.
2017 ****************************************************************************/
2018
2019 static bool unpack_canon_ace(files_struct *fsp,
2020 SMB_STRUCT_STAT *pst,
2021 DOM_SID *pfile_owner_sid,
2022 DOM_SID *pfile_grp_sid,
2023 canon_ace **ppfile_ace, canon_ace **ppdir_ace,
2024 uint32 security_info_sent, SEC_DESC *psd)
2025 {
2026 canon_ace *file_ace = NULL;
2027 canon_ace *dir_ace = NULL;
2028
2029 *ppfile_ace = NULL;
2030 *ppdir_ace = NULL;
2031
2032 if(security_info_sent == 0) {
2033 DEBUG(0,("unpack_canon_ace: no security info sent !\n"));
2034 return False;
2035 }
2036
2037 /*
2038 * If no DACL then this is a chown only security descriptor.
2039 */
2040
2041 if(!(security_info_sent & DACL_SECURITY_INFORMATION) || !psd->dacl)
2042 return True;
2043
2044 /*
2045 * Now go through the DACL and create the canon_ace lists.
2046 */
2047
2048 if (!create_canon_ace_lists( fsp, pst, pfile_owner_sid, pfile_grp_sid,
2049 &file_ace, &dir_ace, psd->dacl))
2050 return False;
2051
2052 if ((file_ace == NULL) && (dir_ace == NULL)) {
2053 /* W2K traverse DACL set - ignore. */
2054 return True;
2055 }
2056
2057 /*
2058 * Go through the canon_ace list and merge entries
2059 * belonging to identical users of identical allow or deny type.
2060 * We can do this as all deny entries come first, followed by
2061 * all allow entries (we have mandated this before accepting this acl).
2062 */
2063
2064 print_canon_ace_list( "file ace - before merge", file_ace);
2065 merge_aces( &file_ace );
2066
2067 print_canon_ace_list( "dir ace - before merge", dir_ace);
2068 merge_aces( &dir_ace );
2069
2070 /*
2071 * NT ACLs are order dependent. Go through the acl lists and
2072 * process DENY entries by masking the allow entries.
2073 */
2074
2075 print_canon_ace_list( "file ace - before deny", file_ace);
2076 process_deny_list( &file_ace);
2077
2078 print_canon_ace_list( "dir ace - before deny", dir_ace);
2079 process_deny_list( &dir_ace);
2080
2081 /*
2082 * A well formed POSIX file or default ACL has at least 3 entries, a
2083 * SMB_ACL_USER_OBJ, SMB_ACL_GROUP_OBJ, SMB_ACL_OTHER_OBJ
2084 * and optionally a mask entry. Ensure this is the case.
2085 */
2086
2087 print_canon_ace_list( "file ace - before valid", file_ace);
2088
2089 /*
2090 * A default 3 element mode entry for a file should be r-- --- ---.
2091 * A default 3 element mode entry for a directory should be rwx --- ---.
2092 */
2093
2094 pst->st_mode = create_default_mode(fsp, False);
2095
2096 if (!ensure_canon_entry_valid(&file_ace, fsp->conn->params, fsp->is_directory, pfile_owner_sid, pfile_grp_sid, pst, True)) {
2097 free_canon_ace_list(file_ace);
2098 free_canon_ace_list(dir_ace);
2099 return False;
2100 }
2101
2102 print_canon_ace_list( "dir ace - before valid", dir_ace);
2103
2104 /*
2105 * A default inheritable 3 element mode entry for a directory should be the
2106 * mode Samba will use to create a file within. Ensure user rwx bits are set if
2107 * it's a directory.
2108 */
2109
2110 pst->st_mode = create_default_mode(fsp, True);
2111
2112 if (dir_ace && !ensure_canon_entry_valid(&dir_ace, fsp->conn->params, fsp->is_directory, pfile_owner_sid, pfile_grp_sid, pst, True)) {
2113 free_canon_ace_list(file_ace);
2114 free_canon_ace_list(dir_ace);
2115 return False;
2116 }
2117
2118 print_canon_ace_list( "file ace - return", file_ace);
2119 print_canon_ace_list( "dir ace - return", dir_ace);
2120
2121 *ppfile_ace = file_ace;
2122 *ppdir_ace = dir_ace;
2123 return True;
2124
2125 }
2126
2127 /******************************************************************************
2128 When returning permissions, try and fit NT display
2129 semantics if possible. Note the the canon_entries here must have been malloced.
2130 The list format should be - first entry = owner, followed by group and other user
2131 entries, last entry = other.
2132
2133 Note that this doesn't exactly match the NT semantics for an ACL. As POSIX entries
2134 are not ordered, and match on the most specific entry rather than walking a list,
2135 then a simple POSIX permission of rw-r--r-- should really map to 5 entries,
2136
2137 Entry 0: owner : deny all except read and write.
2138 Entry 1: owner : allow read and write.
2139 Entry 2: group : deny all except read.
2140 Entry 3: group : allow read.
2141 Entry 4: Everyone : allow read.
2142
2143 But NT cannot display this in their ACL editor !
2144 ********************************************************************************/
2145
2146 static void arrange_posix_perms(const char *filename, canon_ace **pp_list_head)
2147 {
2148 canon_ace *list_head = *pp_list_head;
2149 canon_ace *owner_ace = NULL;
2150 canon_ace *other_ace = NULL;
2151 canon_ace *ace = NULL;
2152
2153 for (ace = list_head; ace; ace = ace->next) {
2154 if (ace->type == SMB_ACL_USER_OBJ)
2155 owner_ace = ace;
2156 else if (ace->type == SMB_ACL_OTHER) {
2157 /* Last ace - this is "other" */
2158 other_ace = ace;
2159 }
2160 }
2161
2162 if (!owner_ace || !other_ace) {
2163 DEBUG(0,("arrange_posix_perms: Invalid POSIX permissions for file %s, missing owner or other.\n",
2164 filename ));
2165 return;
2166 }
2167
2168 /*
2169 * The POSIX algorithm applies to owner first, and other last,
2170 * so ensure they are arranged in this order.
2171 */
2172
2173 if (owner_ace) {
2174 DLIST_PROMOTE(list_head, owner_ace);
2175 }
2176
2177 if (other_ace) {
2178 DLIST_DEMOTE(list_head, other_ace, canon_ace *);
2179 }
2180
2181 /* We have probably changed the head of the list. */
2182
2183 *pp_list_head = list_head;
2184 }
2185
2186 /****************************************************************************
2187 Create a linked list of canonical ACE entries.
2188 ****************************************************************************/
2189
2190 static canon_ace *canonicalise_acl(struct connection_struct *conn,
2191 const char *fname, SMB_ACL_T posix_acl,
2192 const SMB_STRUCT_STAT *psbuf,
2193 const DOM_SID *powner, const DOM_SID *pgroup, struct pai_val *pal, SMB_ACL_TYPE_T the_acl_type)
2194 {
2195 mode_t acl_mask = (S_IRUSR|S_IWUSR|S_IXUSR);
2196 canon_ace *list_head = NULL;
2197 canon_ace *ace = NULL;
2198 canon_ace *next_ace = NULL;
2199 int entry_id = SMB_ACL_FIRST_ENTRY;
2200 SMB_ACL_ENTRY_T entry;
2201 size_t ace_count;
2202
2203 while ( posix_acl && (SMB_VFS_SYS_ACL_GET_ENTRY(conn, posix_acl, entry_id, &entry) == 1)) {
2204 SMB_ACL_TAG_T tagtype;
2205 SMB_ACL_PERMSET_T permset;
2206 DOM_SID sid;
2207 posix_id unix_ug;
2208 enum ace_owner owner_type;
2209
2210 entry_id = SMB_ACL_NEXT_ENTRY;
2211
2212 /* Is this a MASK entry ? */
2213 if (SMB_VFS_SYS_ACL_GET_TAG_TYPE(conn, entry, &tagtype) == -1)
2214 continue;
2215
2216 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, entry, &permset) == -1)
2217 continue;
2218
2219 /* Decide which SID to use based on the ACL type. */
2220 switch(tagtype) {
2221 case SMB_ACL_USER_OBJ:
2222 /* Get the SID from the owner. */
2223 sid_copy(&sid, powner);
2224 unix_ug.uid = psbuf->st_uid;
2225 owner_type = UID_ACE;
2226 break;
2227 case SMB_ACL_USER:
2228 {
2229 uid_t *puid = (uid_t *)SMB_VFS_SYS_ACL_GET_QUALIFIER(conn, entry);
2230 if (puid == NULL) {
2231 DEBUG(0,("canonicalise_acl: Failed to get uid.\n"));
2232 continue;
2233 }
2234 /*
2235 * A SMB_ACL_USER entry for the owner is shadowed by the
2236 * SMB_ACL_USER_OBJ entry and Windows also cannot represent
2237 * that entry, so we ignore it. We also don't create such
2238 * entries out of the blue when setting ACLs, so a get/set
2239 * cycle will drop them.
2240 */
2241 if (the_acl_type == SMB_ACL_TYPE_ACCESS && *puid == psbuf->st_uid) {
2242 SMB_VFS_SYS_ACL_FREE_QUALIFIER(conn, (void *)puid,tagtype);
2243 continue;
2244 }
2245 uid_to_sid( &sid, *puid);
2246 unix_ug.uid = *puid;
2247 owner_type = UID_ACE;
2248 SMB_VFS_SYS_ACL_FREE_QUALIFIER(conn, (void *)puid,tagtype);
2249 break;
2250 }
2251 case SMB_ACL_GROUP_OBJ:
2252 /* Get the SID from the owning group. */
2253 sid_copy(&sid, pgroup);
2254 unix_ug.gid = psbuf->st_gid;
2255 owner_type = GID_ACE;
2256 break;
2257 case SMB_ACL_GROUP:
2258 {
2259 gid_t *pgid = (gid_t *)SMB_VFS_SYS_ACL_GET_QUALIFIER(conn, entry);
2260 if (pgid == NULL) {
2261 DEBUG(0,("canonicalise_acl: Failed to get gid.\n"));
2262 continue;
2263 }
2264 gid_to_sid( &sid, *pgid);
2265 unix_ug.gid = *pgid;
2266 owner_type = GID_ACE;
2267 SMB_VFS_SYS_ACL_FREE_QUALIFIER(conn, (void *)pgid,tagtype);
2268 break;
2269 }
2270 case SMB_ACL_MASK:
2271 acl_mask = convert_permset_to_mode_t(conn, permset);
2272 continue; /* Don't count the mask as an entry. */
2273 case SMB_ACL_OTHER:
2274 /* Use the Everyone SID */
2275 sid = global_sid_World;
2276 unix_ug.world = -1;
2277 owner_type = WORLD_ACE;
2278 break;
2279 default:
2280 DEBUG(0,("canonicalise_acl: Unknown tagtype %u\n", (unsigned int)tagtype));
2281 continue;
2282 }
2283
2284 /*
2285 * Add this entry to the list.
2286 */
2287
2288 if ((ace = SMB_MALLOC_P(canon_ace)) == NULL)
2289 goto fail;
2290
2291 ZERO_STRUCTP(ace);
2292 ace->type = tagtype;
2293 ace->perms = convert_permset_to_mode_t(conn, permset);
2294 ace->attr = ALLOW_ACE;
2295 ace->trustee = sid;
2296 ace->unix_ug = unix_ug;
2297 ace->owner_type = owner_type;
2298 ace->inherited = get_inherited_flag(pal, ace, (the_acl_type == SMB_ACL_TYPE_DEFAULT));
2299
2300 DLIST_ADD(list_head, ace);
2301 }
2302
2303 /*
2304 * This next call will ensure we have at least a user/group/world set.
2305 */
2306
2307 if (!ensure_canon_entry_valid(&list_head, conn->params,
2308 S_ISDIR(psbuf->st_mode), powner, pgroup,
2309 psbuf, False))
2310 goto fail;
2311
2312 /*
2313 * Now go through the list, masking the permissions with the
2314 * acl_mask. Ensure all DENY Entries are at the start of the list.
2315 */
2316
2317 DEBUG(10,("canonicalise_acl: %s ace entries before arrange :\n", the_acl_type == SMB_ACL_TYPE_ACCESS ? "Access" : "Default" ));
2318
2319 for ( ace_count = 0, ace = list_head; ace; ace = next_ace, ace_count++) {
2320 next_ace = ace->next;
2321
2322 /* Masks are only applied to entries other than USER_OBJ and OTHER. */
2323 if (ace->type != SMB_ACL_OTHER && ace->type != SMB_ACL_USER_OBJ)
2324 ace->perms &= acl_mask;
2325
2326 if (ace->perms == 0) {
2327 DLIST_PROMOTE(list_head, ace);
2328 }
2329
2330 if( DEBUGLVL( 10 ) ) {
2331 print_canon_ace(ace, ace_count);
2332 }
2333 }
2334
2335 arrange_posix_perms(fname,&list_head );
2336
2337 print_canon_ace_list( "canonicalise_acl: ace entries after arrange", list_head );
2338
2339 return list_head;
2340
2341 fail:
2342
2343 free_canon_ace_list(list_head);
2344 return NULL;
2345 }
2346
2347 /****************************************************************************
2348 Check if the current user group list contains a given group.
2349 ****************************************************************************/
2350
2351 static bool current_user_in_group(gid_t gid)
2352 {
2353 int i;
2354
2355 for (i = 0; i < current_user.ut.ngroups; i++) {
2356 if (current_user.ut.groups[i] == gid) {
2357 return True;
2358 }
2359 }
2360
2361 return False;
2362 }
2363
2364 /****************************************************************************
2365 Should we override a deny ? Check 'acl group control' and 'dos filemode'.
2366 ****************************************************************************/
2367
2368 static bool acl_group_override(connection_struct *conn,
2369 gid_t prim_gid,
2370 const char *fname)
2371 {
2372 SMB_STRUCT_STAT sbuf;
2373
2374 if ((errno != EPERM) && (errno != EACCES)) {
2375 return false;
2376 }
2377
2378 /* file primary group == user primary or supplementary group */
2379 if (lp_acl_group_control(SNUM(conn)) &&
2380 current_user_in_group(prim_gid)) {
2381 return true;
2382 }
2383
2384 /* user has writeable permission */
2385 if (lp_dos_filemode(SNUM(conn)) &&
2386 can_write_to_file(conn, fname, &sbuf)) {
2387 return true;
2388 }
2389
2390 return false;
2391 }
2392
2393 /****************************************************************************
2394 Attempt to apply an ACL to a file or directory.
2395 ****************************************************************************/
2396
2397 static bool set_canon_ace_list(files_struct *fsp, canon_ace *the_ace, bool default_ace, gid_t prim_gid, bool *pacl_set_support)
2398 {
2399 connection_struct *conn = fsp->conn;
2400 bool ret = False;
2401 SMB_ACL_T the_acl = SMB_VFS_SYS_ACL_INIT(conn, (int)count_canon_ace_list(the_ace) + 1);
2402 canon_ace *p_ace;
2403 int i;
2404 SMB_ACL_ENTRY_T mask_entry;
2405 bool got_mask_entry = False;
2406 SMB_ACL_PERMSET_T mask_permset;
2407 SMB_ACL_TYPE_T the_acl_type = (default_ace ? SMB_ACL_TYPE_DEFAULT : SMB_ACL_TYPE_ACCESS);
2408 bool needs_mask = False;
2409 mode_t mask_perms = 0;
2410
2411 #if defined(POSIX_ACL_NEEDS_MASK)
2412 /* HP-UX always wants to have a mask (called "class" there). */
2413 needs_mask = True;
2414 #endif
2415
2416 if (the_acl == NULL) {
2417
2418 if (!no_acl_syscall_error(errno)) {
2419 /*
2420 * Only print this error message if we have some kind of ACL
2421 * support that's not working. Otherwise we would always get this.
2422 */
2423 DEBUG(0,("set_canon_ace_list: Unable to init %s ACL. (%s)\n",
2424 default_ace ? "default" : "file", strerror(errno) ));
2425 }
2426 *pacl_set_support = False;
2427 return False;
2428 }
2429
2430 if( DEBUGLVL( 10 )) {
2431 dbgtext("set_canon_ace_list: setting ACL:\n");
2432 for (i = 0, p_ace = the_ace; p_ace; p_ace = p_ace->next, i++ ) {
2433 print_canon_ace( p_ace, i);
2434 }
2435 }
2436
2437 for (i = 0, p_ace = the_ace; p_ace; p_ace = p_ace->next, i++ ) {
2438 SMB_ACL_ENTRY_T the_entry;
2439 SMB_ACL_PERMSET_T the_permset;
2440
2441 /*
2442 * ACLs only "need" an ACL_MASK entry if there are any named user or
2443 * named group entries. But if there is an ACL_MASK entry, it applies
2444 * to ACL_USER, ACL_GROUP, and ACL_GROUP_OBJ entries. Set the mask
2445 * so that it doesn't deny (i.e., mask off) any permissions.
2446 */
2447
2448 if (p_ace->type == SMB_ACL_USER || p_ace->type == SMB_ACL_GROUP) {
2449 needs_mask = True;
2450 mask_perms |= p_ace->perms;
2451 } else if (p_ace->type == SMB_ACL_GROUP_OBJ) {
2452 mask_perms |= p_ace->perms;
2453 }
2454
2455 /*
2456 * Get the entry for this ACE.
2457 */
2458
2459 if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &the_acl, &the_entry) == -1) {
2460 DEBUG(0,("set_canon_ace_list: Failed to create entry %d. (%s)\n",
2461 i, strerror(errno) ));
2462 goto fail;
2463 }
2464
2465 if (p_ace->type == SMB_ACL_MASK) {
2466 mask_entry = the_entry;
2467 got_mask_entry = True;
2468 }
2469
2470 /*
2471 * Ok - we now know the ACL calls should be working, don't
2472 * allow fallback to chmod.
2473 */
2474
2475 *pacl_set_support = True;
2476
2477 /*
2478 * Initialise the entry from the canon_ace.
2479 */
2480
2481 /*
2482 * First tell the entry what type of ACE this is.
2483 */
2484
2485 if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, the_entry, p_ace->type) == -1) {
2486 DEBUG(0,("set_canon_ace_list: Failed to set tag type on entry %d. (%s)\n",
2487 i, strerror(errno) ));
2488 goto fail;
2489 }
2490
2491 /*
2492 * Only set the qualifier (user or group id) if the entry is a user
2493 * or group id ACE.
2494 */
2495
2496 if ((p_ace->type == SMB_ACL_USER) || (p_ace->type == SMB_ACL_GROUP)) {
2497 if (SMB_VFS_SYS_ACL_SET_QUALIFIER(conn, the_entry,(void *)&p_ace->unix_ug.uid) == -1) {
2498 DEBUG(0,("set_canon_ace_list: Failed to set qualifier on entry %d. (%s)\n",
2499 i, strerror(errno) ));
2500 goto fail;
2501 }
2502 }
2503
2504 /*
2505 * Convert the mode_t perms in the canon_ace to a POSIX permset.
2506 */
2507
2508 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, the_entry, &the_permset) == -1) {
2509 DEBUG(0,("set_canon_ace_list: Failed to get permset on entry %d. (%s)\n",
2510 i, strerror(errno) ));
2511 goto fail;
2512 }
2513
2514 if (map_acl_perms_to_permset(conn, p_ace->perms, &the_permset) == -1) {
2515 DEBUG(0,("set_canon_ace_list: Failed to create permset for mode (%u) on entry %d. (%s)\n",
2516 (unsigned int)p_ace->perms, i, strerror(errno) ));
2517 goto fail;
2518 }
2519
2520 /*
2521 * ..and apply them to the entry.
2522 */
2523
2524 if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, the_entry, the_permset) == -1) {
2525 DEBUG(0,("set_canon_ace_list: Failed to add permset on entry %d. (%s)\n",
2526 i, strerror(errno) ));
2527 goto fail;
2528 }
2529
2530 if( DEBUGLVL( 10 ))
2531 print_canon_ace( p_ace, i);
2532
2533 }
2534
2535 if (needs_mask && !got_mask_entry) {
2536 if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &the_acl, &mask_entry) == -1) {
2537 DEBUG(0,("set_canon_ace_list: Failed to create mask entry. (%s)\n", strerror(errno) ));
2538 goto fail;
2539 }
2540
2541 if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, mask_entry, SMB_ACL_MASK) == -1) {
2542 DEBUG(0,("set_canon_ace_list: Failed to set tag type on mask entry. (%s)\n",strerror(errno) ));
2543 goto fail;
2544 }
2545
2546 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, mask_entry, &mask_permset) == -1) {
2547 DEBUG(0,("set_canon_ace_list: Failed to get mask permset. (%s)\n", strerror(errno) ));
2548 goto fail;
2549 }
2550
2551 if (map_acl_perms_to_permset(conn, S_IRUSR|S_IWUSR|S_IXUSR, &mask_permset) == -1) {
2552 DEBUG(0,("set_canon_ace_list: Failed to create mask permset. (%s)\n", strerror(errno) ));
2553 goto fail;
2554 }
2555
2556 if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, mask_entry, mask_permset) == -1) {
2557 DEBUG(0,("set_canon_ace_list: Failed to add mask permset. (%s)\n", strerror(errno) ));
2558 goto fail;
2559 }
2560 }
2561
2562 /*
2563 * Finally apply it to the file or directory.
2564 */
2565
2566 if(default_ace || fsp->is_directory || fsp->fh->fd == -1) {
2567 if (SMB_VFS_SYS_ACL_SET_FILE(conn, fsp->fsp_name, the_acl_type, the_acl) == -1) {
2568 /*
2569 * Some systems allow all the above calls and only fail with no ACL support
2570 * when attempting to apply the acl. HPUX with HFS is an example of this. JRA.
2571 */
2572 if (no_acl_syscall_error(errno)) {
2573 *pacl_set_support = False;
2574 }
2575
2576 if (acl_group_override(conn, prim_gid, fsp->fsp_name)) {
2577 int sret;
2578
2579 DEBUG(5,("set_canon_ace_list: acl group control on and current user in file %s primary group.\n",
2580 fsp->fsp_name ));
2581
2582 become_root();
2583 sret = SMB_VFS_SYS_ACL_SET_FILE(conn, fsp->fsp_name, the_acl_type, the_acl);
2584 unbecome_root();
2585 if (sret == 0) {
2586 ret = True;
2587 }
2588 }
2589
2590 if (ret == False) {
2591 DEBUG(2,("set_canon_ace_list: sys_acl_set_file type %s failed for file %s (%s).\n",
2592 the_acl_type == SMB_ACL_TYPE_DEFAULT ? "directory default" : "file",
2593 fsp->fsp_name, strerror(errno) ));
2594 goto fail;
2595 }
2596 }
2597 } else {
2598 if (SMB_VFS_SYS_ACL_SET_FD(fsp, the_acl) == -1) {
2599 /*
2600 * Some systems allow all the above calls and only fail with no ACL support
2601 * when attempting to apply the acl. HPUX with HFS is an example of this. JRA.
2602 */
2603 if (no_acl_syscall_error(errno)) {
2604 *pacl_set_support = False;
2605 }
2606
2607 if (acl_group_override(conn, prim_gid, fsp->fsp_name)) {
2608 int sret;
2609
2610 DEBUG(5,("set_canon_ace_list: acl group control on and current user in file %s primary group.\n",
2611 fsp->fsp_name ));
2612
2613 become_root();
2614 sret = SMB_VFS_SYS_ACL_SET_FD(fsp, the_acl);
2615 unbecome_root();
2616 if (sret == 0) {
2617 ret = True;
2618 }
2619 }
2620
2621 if (ret == False) {
2622 DEBUG(2,("set_canon_ace_list: sys_acl_set_file failed for file %s (%s).\n",
2623 fsp->fsp_name, strerror(errno) ));
2624 goto fail;
2625 }
2626 }
2627 }
2628
2629 ret = True;
2630
2631 fail:
2632
2633 if (the_acl != NULL) {
2634 SMB_VFS_SYS_ACL_FREE_ACL(conn, the_acl);
2635 }
2636
2637 return ret;
2638 }
2639
2640 /****************************************************************************
2641 Find a particular canon_ace entry.
2642 ****************************************************************************/
2643
2644 static struct canon_ace *canon_ace_entry_for(struct canon_ace *list, SMB_ACL_TAG_T type, posix_id *id)
2645 {
2646 while (list) {
2647 if (list->type == type && ((type != SMB_ACL_USER && type != SMB_ACL_GROUP) ||
2648 (type == SMB_ACL_USER && id && id->uid == list->unix_ug.uid) ||
2649 (type == SMB_ACL_GROUP && id && id->gid == list->unix_ug.gid)))
2650 break;
2651 list = list->next;
2652 }
2653 return list;
2654 }
2655
2656 /****************************************************************************
2657
2658 ****************************************************************************/
2659
2660 SMB_ACL_T free_empty_sys_acl(connection_struct *conn, SMB_ACL_T the_acl)
2661 {
2662 SMB_ACL_ENTRY_T entry;
2663
2664 if (!the_acl)
2665 return NULL;
2666 if (SMB_VFS_SYS_ACL_GET_ENTRY(conn, the_acl, SMB_ACL_FIRST_ENTRY, &entry) != 1) {
2667 SMB_VFS_SYS_ACL_FREE_ACL(conn, the_acl);
2668 return NULL;
2669 }
2670 return the_acl;
2671 }
2672
2673 /****************************************************************************
2674 Convert a canon_ace to a generic 3 element permission - if possible.
2675 ****************************************************************************/
2676
2677 #define MAP_PERM(p,mask,result) (((p) & (mask)) ? (result) : 0 )
2678
2679 static bool convert_canon_ace_to_posix_perms( files_struct *fsp, canon_ace *file_ace_list, mode_t *posix_perms)
2680 {
2681 int snum = SNUM(fsp->conn);
2682 size_t ace_count = count_canon_ace_list(file_ace_list);
2683 canon_ace *ace_p;
2684 canon_ace *owner_ace = NULL;
2685 canon_ace *group_ace = NULL;
2686 canon_ace *other_ace = NULL;
2687 mode_t and_bits;
2688 mode_t or_bits;
2689
2690 if (ace_count != 3) {
2691 DEBUG(3,("convert_canon_ace_to_posix_perms: Too many ACE entries for file %s to convert to \
2692 posix perms.\n", fsp->fsp_name ));
2693 return False;
2694 }
2695
2696 for (ace_p = file_ace_list; ace_p; ace_p = ace_p->next) {
2697 if (ace_p->owner_type == UID_ACE)
2698 owner_ace = ace_p;
2699 else if (ace_p->owner_type == GID_ACE)
2700 group_ace = ace_p;
2701 else if (ace_p->owner_type == WORLD_ACE)
2702 other_ace = ace_p;
2703 }
2704
2705 if (!owner_ace || !group_ace || !other_ace) {
2706 DEBUG(3,("convert_canon_ace_to_posix_perms: Can't get standard entries for file %s.\n",
2707 fsp->fsp_name ));
2708 return False;
2709 }
2710
2711 *posix_perms = (mode_t)0;
2712
2713 *posix_perms |= owner_ace->perms;
2714 *posix_perms |= MAP_PERM(group_ace->perms, S_IRUSR, S_IRGRP);
2715 *posix_perms |= MAP_PERM(group_ace->perms, S_IWUSR, S_IWGRP);
2716 *posix_perms |= MAP_PERM(group_ace->perms, S_IXUSR, S_IXGRP);
2717 *posix_perms |= MAP_PERM(other_ace->perms, S_IRUSR, S_IROTH);
2718 *posix_perms |= MAP_PERM(other_ace->perms, S_IWUSR, S_IWOTH);
2719 *posix_perms |= MAP_PERM(other_ace->perms, S_IXUSR, S_IXOTH);
2720
2721 /* The owner must have at least read access. */
2722
2723 *posix_perms |= S_IRUSR;
2724 if (fsp->is_directory)
2725 *posix_perms |= (S_IWUSR|S_IXUSR);
2726
2727 /* If requested apply the masks. */
2728
2729 /* Get the initial bits to apply. */
2730
2731 if (fsp->is_directory) {
2732 and_bits = lp_dir_security_mask(snum);
2733 or_bits = lp_force_dir_security_mode(snum);
2734 } else {
2735 and_bits = lp_security_mask(snum);
2736 or_bits = lp_force_security_mode(snum);
2737 }
2738
2739 *posix_perms = (((*posix_perms) & and_bits)|or_bits);
2740
2741 DEBUG(10,("convert_canon_ace_to_posix_perms: converted u=%o,g=%o,w=%o to perm=0%o for file %s.\n",
2742 (int)owner_ace->perms, (int)group_ace->perms, (int)other_ace->perms, (int)*posix_perms,
2743 fsp->fsp_name ));
2744
2745 return True;
2746 }
2747
2748 /****************************************************************************
2749 Incoming NT ACLs on a directory can be split into a default POSIX acl (CI|OI|IO) and
2750 a normal POSIX acl. Win2k needs these split acls re-merging into one ACL
2751 with CI|OI set so it is inherited and also applies to the directory.
2752 Based on code from "Jim McDonough" <jmcd@us.ibm.com>.
2753 ****************************************************************************/
2754
2755 static size_t merge_default_aces( SEC_ACE *nt_ace_list, size_t num_aces)
2756 {
2757 size_t i, j;
2758
2759 for (i = 0; i < num_aces; i++) {
2760 for (j = i+1; j < num_aces; j++) {
2761 uint32 i_flags_ni = (nt_ace_list[i].flags & ~SEC_ACE_FLAG_INHERITED_ACE);
2762 uint32 j_flags_ni = (nt_ace_list[j].flags & ~SEC_ACE_FLAG_INHERITED_ACE);
2763 bool i_inh = (nt_ace_list[i].flags & SEC_ACE_FLAG_INHERITED_ACE) ? True : False;
2764 bool j_inh = (nt_ace_list[j].flags & SEC_ACE_FLAG_INHERITED_ACE) ? True : False;
2765
2766 /* We know the lower number ACE's are file entries. */
2767 if ((nt_ace_list[i].type == nt_ace_list[j].type) &&
2768 (nt_ace_list[i].size == nt_ace_list[j].size) &&
2769 (nt_ace_list[i].access_mask == nt_ace_list[j].access_mask) &&
2770 sid_equal(&nt_ace_list[i].trustee, &nt_ace_list[j].trustee) &&
2771 (i_inh == j_inh) &&
2772 (i_flags_ni == 0) &&
2773 (j_flags_ni == (SEC_ACE_FLAG_OBJECT_INHERIT|
2774 SEC_ACE_FLAG_CONTAINER_INHERIT|
2775 SEC_ACE_FLAG_INHERIT_ONLY))) {
2776 /*
2777 * W2K wants to have access allowed zero access ACE's
2778 * at the end of the list. If the mask is zero, merge
2779 * the non-inherited ACE onto the inherited ACE.
2780 */
2781
2782 if (nt_ace_list[i].access_mask == 0) {
2783 nt_ace_list[j].flags = SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT|
2784 (i_inh ? SEC_ACE_FLAG_INHERITED_ACE : 0);
2785 if (num_aces - i - 1 > 0)
2786 memmove(&nt_ace_list[i], &nt_ace_list[i+1], (num_aces-i-1) *
2787 sizeof(SEC_ACE));
2788
2789 DEBUG(10,("merge_default_aces: Merging zero access ACE %u onto ACE %u.\n",
2790 (unsigned int)i, (unsigned int)j ));
2791 } else {
2792 /*
2793 * These are identical except for the flags.
2794 * Merge the inherited ACE onto the non-inherited ACE.
2795 */
2796
2797 nt_ace_list[i].flags = SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT|
2798 (i_inh ? SEC_ACE_FLAG_INHERITED_ACE : 0);
2799 if (num_aces - j - 1 > 0)
2800 memmove(&nt_ace_list[j], &nt_ace_list[j+1], (num_aces-j-1) *
2801 sizeof(SEC_ACE));
2802
2803 DEBUG(10,("merge_default_aces: Merging ACE %u onto ACE %u.\n",
2804 (unsigned int)j, (unsigned int)i ));
2805 }
2806 num_aces--;
2807 break;
2808 }
2809 }
2810 }
2811
2812 return num_aces;
2813 }
2814
2815 /****************************************************************************
2816 Reply to query a security descriptor from an fsp. If it succeeds it allocates
2817 the space for the return elements and returns the size needed to return the
2818 security descriptor. This should be the only external function needed for
2819 the UNIX style get ACL.
2820 ****************************************************************************/
2821
2822 static NTSTATUS posix_get_nt_acl_common(struct connection_struct *conn,
2823 const char *name,
2824 const SMB_STRUCT_STAT *sbuf,
2825 struct pai_val *pal,
2826 SMB_ACL_T posix_acl,
2827 SMB_ACL_T def_acl,
2828 uint32_t security_info,
2829 SEC_DESC **ppdesc)
2830 {
2831 DOM_SID owner_sid;
2832 DOM_SID group_sid;
2833 size_t sd_size = 0;
2834 SEC_ACL *psa = NULL;
2835 size_t num_acls = 0;
2836 size_t num_def_acls = 0;
2837 size_t num_aces = 0;
2838 canon_ace *file_ace = NULL;
2839 canon_ace *dir_ace = NULL;
2840 SEC_ACE *nt_ace_list = NULL;
2841 size_t num_profile_acls = 0;
2842 SEC_DESC *psd = NULL;
2843
2844 /*
2845 * Get the owner, group and world SIDs.
2846 */
2847
2848 if (lp_profile_acls(SNUM(conn))) {
2849 /* For WXP SP1 the owner must be administrators. */
2850 sid_copy(&owner_sid, &global_sid_Builtin_Administrators);
2851 sid_copy(&group_sid, &global_sid_Builtin_Users);
2852 num_profile_acls = 2;
2853 } else {
2854 create_file_sids(sbuf, &owner_sid, &group_sid);
2855 }
2856
2857 if ((security_info & DACL_SECURITY_INFORMATION) && !(security_info & PROTECTED_DACL_SECURITY_INFORMATION)) {
2858
2859 /*
2860 * In the optimum case Creator Owner and Creator Group would be used for
2861 * the ACL_USER_OBJ and ACL_GROUP_OBJ entries, respectively, but this
2862 * would lead to usability problems under Windows: The Creator entries
2863 * are only available in browse lists of directories and not for files;
2864 * additionally the identity of the owning group couldn't be determined.
2865 * We therefore use those identities only for Default ACLs.
2866 */
2867
2868 /* Create the canon_ace lists. */
2869 file_ace = canonicalise_acl(conn, name, posix_acl, sbuf,
2870 &owner_sid, &group_sid, pal,
2871 SMB_ACL_TYPE_ACCESS);
2872
2873 /* We must have *some* ACLS. */
2874
2875 if (count_canon_ace_list(file_ace) == 0) {
2876 DEBUG(0,("get_nt_acl : No ACLs on file (%s) !\n", name));
2877 goto done;
2878 }
2879
2880 if (S_ISDIR(sbuf->st_mode) && def_acl) {
2881 dir_ace = canonicalise_acl(conn, name, def_acl,
2882 sbuf,
2883 &global_sid_Creator_Owner,
2884 &global_sid_Creator_Group,
2885 pal, SMB_ACL_TYPE_DEFAULT);
2886 }
2887
2888 /*
2889 * Create the NT ACE list from the canonical ace lists.
2890 */
2891
2892 {
2893 canon_ace *ace;
2894 enum security_ace_type nt_acl_type;
2895
2896 if (nt4_compatible_acls() && dir_ace) {
2897 /*
2898 * NT 4 chokes if an ACL contains an INHERIT_ONLY entry
2899 * but no non-INHERIT_ONLY entry for one SID. So we only
2900 * remove entries from the Access ACL if the
2901 * corresponding Default ACL entries have also been
2902 * removed. ACEs for CREATOR-OWNER and CREATOR-GROUP
2903 * are exceptions. We can do nothing
2904 * intelligent if the Default ACL contains entries that
2905 * are not also contained in the Access ACL, so this
2906 * case will still fail under NT 4.
2907 */
2908
2909 ace = canon_ace_entry_for(dir_ace, SMB_ACL_OTHER, NULL);
2910 if (ace && !ace->perms) {
2911 DLIST_REMOVE(dir_ace, ace);
2912 SAFE_FREE(ace);
2913
2914 ace = canon_ace_entry_for(file_ace, SMB_ACL_OTHER, NULL);
2915 if (ace && !ace->perms) {
2916 DLIST_REMOVE(file_ace, ace);
2917 SAFE_FREE(ace);
2918 }
2919 }
2920
2921 /*
2922 * WinNT doesn't usually have Creator Group
2923 * in browse lists, so we send this entry to
2924 * WinNT even if it contains no relevant
2925 * permissions. Once we can add
2926 * Creator Group to browse lists we can
2927 * re-enable this.
2928 */
2929
2930 #if 0
2931 ace = canon_ace_entry_for(dir_ace, SMB_ACL_GROUP_OBJ, NULL);
2932 if (ace && !ace->perms) {
2933 DLIST_REMOVE(dir_ace, ace);
2934 SAFE_FREE(ace);
2935 }
2936 #endif
2937
2938 ace = canon_ace_entry_for(file_ace, SMB_ACL_GROUP_OBJ, NULL);
2939 if (ace && !ace->perms) {
2940 DLIST_REMOVE(file_ace, ace);
2941 SAFE_FREE(ace);
2942 }
2943 }
2944
2945 num_acls = count_canon_ace_list(file_ace);
2946 num_def_acls = count_canon_ace_list(dir_ace);
2947
2948 /* Allocate the ace list. */
2949 if ((nt_ace_list = SMB_MALLOC_ARRAY(SEC_ACE,num_acls + num_profile_acls + num_def_acls)) == NULL) {
2950 DEBUG(0,("get_nt_acl: Unable to malloc space for nt_ace_list.\n"));
2951 goto done;
2952 }
2953
2954 memset(nt_ace_list, '\0', (num_acls + num_def_acls) * sizeof(SEC_ACE) );
2955
2956 /*
2957 * Create the NT ACE list from the canonical ace lists.
2958 */
2959
2960 for (ace = file_ace; ace != NULL; ace = ace->next) {
2961 SEC_ACCESS acc;
2962
2963 acc = map_canon_ace_perms(SNUM(conn),
2964 &nt_acl_type,
2965 ace->perms,
2966 S_ISDIR(sbuf->st_mode));
2967 init_sec_ace(&nt_ace_list[num_aces++],
2968 &ace->trustee,
2969 nt_acl_type,
2970 acc,
2971 ace->inherited ?
2972 SEC_ACE_FLAG_INHERITED_ACE : 0);
2973 }
2974
2975 /* The User must have access to a profile share - even
2976 * if we can't map the SID. */
2977 if (lp_profile_acls(SNUM(conn))) {
2978 SEC_ACCESS acc;
2979
2980 init_sec_access(&acc,FILE_GENERIC_ALL);
2981 init_sec_ace(&nt_ace_list[num_aces++],
2982 &global_sid_Builtin_Users,
2983 SEC_ACE_TYPE_ACCESS_ALLOWED,
2984 acc, 0);
2985 }
2986
2987 for (ace = dir_ace; ace != NULL; ace = ace->next) {
2988 SEC_ACCESS acc;
2989
2990 acc = map_canon_ace_perms(SNUM(conn),
2991 &nt_acl_type,
2992 ace->perms,
2993 S_ISDIR(sbuf->st_mode));
2994 init_sec_ace(&nt_ace_list[num_aces++],
2995 &ace->trustee,
2996 nt_acl_type,
2997 acc,
2998 SEC_ACE_FLAG_OBJECT_INHERIT|
2999 SEC_ACE_FLAG_CONTAINER_INHERIT|
3000 SEC_ACE_FLAG_INHERIT_ONLY|
3001 (ace->inherited ?
3002 SEC_ACE_FLAG_INHERITED_ACE : 0));
3003 }
3004
3005 /* The User must have access to a profile share - even
3006 * if we can't map the SID. */
3007 if (lp_profile_acls(SNUM(conn))) {
3008 SEC_ACCESS acc;
3009
3010 init_sec_access(&acc,FILE_GENERIC_ALL);
3011 init_sec_ace(&nt_ace_list[num_aces++], &global_sid_Builtin_Users, SEC_ACE_TYPE_ACCESS_ALLOWED, acc,
3012 SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT|
3013 SEC_ACE_FLAG_INHERIT_ONLY|0);
3014 }
3015
3016 /*
3017 * Merge POSIX default ACLs and normal ACLs into one NT ACE.
3018 * Win2K needs this to get the inheritance correct when replacing ACLs
3019 * on a directory tree. Based on work by Jim @ IBM.
3020 */
3021
3022 num_aces = merge_default_aces(nt_ace_list, num_aces);
3023
3024 }
3025
3026 if (num_aces) {
3027 if((psa = make_sec_acl( talloc_tos(), NT4_ACL_REVISION, num_aces, nt_ace_list)) == NULL) {
3028 DEBUG(0,("get_nt_acl: Unable to malloc space for acl.\n"));
3029 goto done;
3030 }
3031 }
3032 } /* security_info & DACL_SECURITY_INFORMATION */
3033
3034 psd = make_standard_sec_desc( talloc_tos(),
3035 (security_info & OWNER_SECURITY_INFORMATION) ? &owner_sid : NULL,
3036 (security_info & GROUP_SECURITY_INFORMATION) ? &group_sid : NULL,
3037 psa,
3038 &sd_size);
3039
3040 if(!psd) {
3041 DEBUG(0,("get_nt_acl: Unable to malloc space for security descriptor.\n"));
3042 sd_size = 0;
3043 goto done;
3044 }
3045
3046 /*
3047 * Windows 2000: The DACL_PROTECTED flag in the security
3048 * descriptor marks the ACL as non-inheriting, i.e., no
3049 * ACEs from higher level directories propagate to this
3050 * ACL. In the POSIX ACL model permissions are only
3051 * inherited at file create time, so ACLs never contain
3052 * any ACEs that are inherited dynamically. The DACL_PROTECTED
3053 * flag doesn't seem to bother Windows NT.
3054 * Always set this if map acl inherit is turned off.
3055 */
3056 if (get_protected_flag(pal) || !lp_map_acl_inherit(SNUM(conn))) {
3057 psd->type |= SE_DESC_DACL_PROTECTED;
3058 }
3059
3060 if (psd->dacl) {
3061 dacl_sort_into_canonical_order(psd->dacl->aces, (unsigned int)psd->dacl->num_aces);
3062 }
3063
3064 *ppdesc = psd;
3065
3066 done:
3067
3068 if (posix_acl) {
3069 SMB_VFS_SYS_ACL_FREE_ACL(conn, posix_acl);
3070 }
3071 if (def_acl) {
3072 SMB_VFS_SYS_ACL_FREE_ACL(conn, def_acl);
3073 }
3074 free_canon_ace_list(file_ace);
3075 free_canon_ace_list(dir_ace);
3076 free_inherited_info(pal);
3077 SAFE_FREE(nt_ace_list);
3078
3079 return NT_STATUS_OK;
3080 }
3081
3082 NTSTATUS posix_fget_nt_acl(struct files_struct *fsp, uint32_t security_info,
3083 SEC_DESC **ppdesc)
3084 {
3085 SMB_STRUCT_STAT sbuf;
3086 SMB_ACL_T posix_acl = NULL;
3087 struct pai_val *pal;
3088
3089 *ppdesc = NULL;
3090
3091 DEBUG(10,("posix_fget_nt_acl: called for file %s\n", fsp->fsp_name ));
3092
3093 /* can it happen that fsp_name == NULL ? */
3094 if (fsp->is_directory || fsp->fh->fd == -1) {
3095 return posix_get_nt_acl(fsp->conn, fsp->fsp_name,
3096 security_info, ppdesc);
3097 }
3098
3099 /* Get the stat struct for the owner info. */
3100 if(SMB_VFS_FSTAT(fsp, &sbuf) != 0) {
3101 return map_nt_error_from_unix(errno);
3102 }
3103
3104 /* Get the ACL from the fd. */
3105 posix_acl = SMB_VFS_SYS_ACL_GET_FD(fsp);
3106
3107 pal = fload_inherited_info(fsp);
3108
3109 return posix_get_nt_acl_common(fsp->conn, fsp->fsp_name, &sbuf, pal,
3110 posix_acl, NULL, security_info, ppdesc);
3111 }
3112
3113 NTSTATUS posix_get_nt_acl(struct connection_struct *conn, const char *name,
3114 uint32_t security_info, SEC_DESC **ppdesc)
3115 {
3116 SMB_STRUCT_STAT sbuf;
3117 SMB_ACL_T posix_acl = NULL;
3118 SMB_ACL_T def_acl = NULL;
3119 struct pai_val *pal;
3120
3121 *ppdesc = NULL;
3122
3123 DEBUG(10,("posix_get_nt_acl: called for file %s\n", name ));
3124
3125 /* Get the stat struct for the owner info. */
3126 if(SMB_VFS_STAT(conn, name, &sbuf) != 0) {
3127 return map_nt_error_from_unix(errno);
3128 }
3129
3130 /* Get the ACL from the path. */
3131 posix_acl = SMB_VFS_SYS_ACL_GET_FILE(conn, name, SMB_ACL_TYPE_ACCESS);
3132
3133 /* If it's a directory get the default POSIX ACL. */
3134 if(S_ISDIR(sbuf.st_mode)) {
3135 def_acl = SMB_VFS_SYS_ACL_GET_FILE(conn, name, SMB_ACL_TYPE_DEFAULT);
3136 def_acl = free_empty_sys_acl(conn, def_acl);
3137 }
3138
3139 pal = load_inherited_info(conn, name);
3140
3141 return posix_get_nt_acl_common(conn, name, &sbuf, pal, posix_acl,
3142 def_acl, security_info, ppdesc);
3143 }
3144
3145 /****************************************************************************
3146 Try to chown a file. We will be able to chown it under the following conditions.
3147
3148 1) If we have root privileges, then it will just work.
3149 2) If we have SeTakeOwnershipPrivilege we can change the user to the current user.
3150 3) If we have SeRestorePrivilege we can change the user to any other user.
3151 4) If we have write permission to the file and dos_filemodes is set
3152 then allow chown to the currently authenticated user.
3153 ****************************************************************************/
3154
3155 int try_chown(connection_struct *conn, const char *fname, uid_t uid, gid_t gid)
3156 {
3157 int ret;
3158 files_struct *fsp;
3159 SMB_STRUCT_STAT st;
3160
3161 if(!CAN_WRITE(conn)) {
3162 return -1;
3163 }
3164
3165 /* Case (1). */
3166 /* try the direct way first */
3167 ret = SMB_VFS_CHOWN(conn, fname, uid, gid);
3168 if (ret == 0)
3169 return 0;
3170
3171 /* Case (2) / (3) */
3172 if (lp_enable_privileges()) {
3173
3174 bool has_take_ownership_priv = user_has_privileges(current_user.nt_user_token,
3175 &se_take_ownership);
3176 bool has_restore_priv = user_has_privileges(current_user.nt_user_token,
3177 &se_restore);
3178
3179 /* Case (2) */
3180 if ( ( has_take_ownership_priv && ( uid == current_user.ut.uid ) ) ||
3181 /* Case (3) */
3182 ( has_restore_priv ) ) {
3183
3184 become_root();
3185 /* Keep the current file gid the same - take ownership doesn't imply group change. */
3186 ret = SMB_VFS_CHOWN(conn, fname, uid, (gid_t)-1);
3187 unbecome_root();
3188 return ret;
3189 }
3190 }
3191
3192 /* Case (4). */
3193 if (!lp_dos_filemode(SNUM(conn))) {
3194 errno = EPERM;
3195 return -1;
3196 }
3197
3198 if (SMB_VFS_STAT(conn,fname,&st)) {
3199 return -1;
3200 }
3201
3202 if (!NT_STATUS_IS_OK(open_file_fchmod(conn,fname,&st,&fsp))) {
3203 return -1;
3204 }
3205
3206 /* only allow chown to the current user. This is more secure,
3207 and also copes with the case where the SID in a take ownership ACL is
3208 a local SID on the users workstation
3209 */
3210 uid = current_user.ut.uid;
3211
3212 become_root();
3213 /* Keep the current file gid the same. */
3214 ret = SMB_VFS_FCHOWN(fsp, uid, (gid_t)-1);
3215 unbecome_root();
3216
3217 close_file_fchmod(fsp);
3218
3219 return ret;
3220 }
3221
3222 /****************************************************************************
3223 Take care of parent ACL inheritance.
3224 ****************************************************************************/
3225
3226 static NTSTATUS append_parent_acl(files_struct *fsp,
3227 SMB_STRUCT_STAT *psbuf,
3228 SEC_DESC *psd,
3229 SEC_DESC **pp_new_sd)
3230 {
3231 SEC_DESC *parent_sd = NULL;
3232 files_struct *parent_fsp = NULL;
3233 TALLOC_CTX *mem_ctx = talloc_parent(psd);
3234 char *parent_name = NULL;
3235 SEC_ACE *new_ace = NULL;
3236 unsigned int num_aces = psd->dacl->num_aces;
3237 SMB_STRUCT_STAT sbuf;
3238 NTSTATUS status;
3239 int info;
3240 unsigned int i, j;
3241 bool is_dacl_protected = (psd->type & SE_DESC_DACL_PROTECTED);
3242
3243 ZERO_STRUCT(sbuf);
3244
3245 if (mem_ctx == NULL) {
3246 return NT_STATUS_NO_MEMORY;
3247 }
3248
3249 if (!parent_dirname_talloc(mem_ctx,
3250 fsp->fsp_name,
3251 &parent_name,
3252 NULL)) {
3253 return NT_STATUS_NO_MEMORY;
3254 }
3255
3256 status = open_directory(fsp->conn,
3257 NULL,
3258 parent_name,
3259 &sbuf,
3260 FILE_READ_ATTRIBUTES, /* Just a stat open */
3261 FILE_SHARE_NONE, /* Ignored for stat opens */
3262 FILE_OPEN,
3263 0,
3264 INTERNAL_OPEN_ONLY,
3265 &info,
3266 &parent_fsp);
3267
3268 if (!NT_STATUS_IS_OK(status)) {
3269 return status;
3270 }
3271
3272 status = SMB_VFS_GET_NT_ACL(parent_fsp->conn, parent_fsp->fsp_name,
3273 DACL_SECURITY_INFORMATION, &parent_sd );
3274
3275 close_file(parent_fsp, NORMAL_CLOSE);
3276
3277 if (!NT_STATUS_IS_OK(status)) {
3278 return status;
3279 }
3280
3281 /*
3282 * Make room for potentially all the ACLs from
3283 * the parent. We used to add the ugw triple here,
3284 * as we knew we were dealing with POSIX ACLs.
3285 * We no longer need to do so as we can guarentee
3286 * that a default ACL from the parent directory will
3287 * be well formed for POSIX ACLs if it came from a
3288 * POSIX ACL source, and if we're not writing to a
3289 * POSIX ACL sink then we don't care if it's not well
3290 * formed. JRA.
3291 */
3292
3293 num_aces += parent_sd->dacl->num_aces;
3294
3295 if((new_ace = TALLOC_ZERO_ARRAY(mem_ctx, SEC_ACE,
3296 num_aces)) == NULL) {
3297 return NT_STATUS_NO_MEMORY;
3298 }
3299
3300 /* Start by copying in all the given ACE entries. */
3301 for (i = 0; i < psd->dacl->num_aces; i++) {
3302 sec_ace_copy(&new_ace[i], &psd->dacl->aces[i]);
3303 }
3304
3305 /*
3306 * Note that we're ignoring "inherit permissions" here
3307 * as that really only applies to newly created files. JRA.
3308 */
3309
3310 /* Finally append any inherited ACEs. */
3311 for (j = 0; j < parent_sd->dacl->num_aces; j++) {
3312 SEC_ACE *se = &parent_sd->dacl->aces[j];
3313
3314 if (fsp->is_directory) {
3315 if (!(se->flags & SEC_ACE_FLAG_CONTAINER_INHERIT)) {
3316 /* Doesn't apply to a directory - ignore. */
3317 DEBUG(10,("append_parent_acl: directory %s "
3318 "ignoring non container "
3319 "inherit flags %u on ACE with sid %s "
3320 "from parent %s\n",
3321 fsp->fsp_name,
3322 (unsigned int)se->flags,
3323 sid_string_dbg(&se->trustee),
3324 parent_name));
3325 continue;
3326 }
3327 } else {
3328 if (!(se->flags & SEC_ACE_FLAG_OBJECT_INHERIT)) {
3329 /* Doesn't apply to a file - ignore. */
3330 DEBUG(10,("append_parent_acl: file %s "
3331 "ignoring non object "
3332 "inherit flags %u on ACE with sid %s "
3333 "from parent %s\n",
3334 fsp->fsp_name,
3335 (unsigned int)se->flags,
3336 sid_string_dbg(&se->trustee),
3337 parent_name));
3338 continue;
3339 }
3340 }
3341
3342 if (is_dacl_protected) {
3343 /* If the DACL is protected it means we must
3344 * not overwrite an existing ACE entry with the
3345 * same SID. This is order N^2. Ouch :-(. JRA. */
3346 unsigned int k;
3347 for (k = 0; k < psd->dacl->num_aces; k++) {
3348 if (sid_equal(&psd->dacl->aces[k].trustee,
3349 &se->trustee)) {
3350 break;
3351 }
3352 }
3353 if (k < psd->dacl->num_aces) {
3354 /* SID matched. Ignore. */
3355 DEBUG(10,("append_parent_acl: path %s "
3356 "ignoring ACE with protected sid %s "
3357 "from parent %s\n",
3358 fsp->fsp_name,
3359 sid_string_dbg(&se->trustee),
3360 parent_name));
3361 continue;
3362 }
3363 }
3364
3365 sec_ace_copy(&new_ace[i], se);
3366 if (se->flags & SEC_ACE_FLAG_NO_PROPAGATE_INHERIT) {
3367 new_ace[i].flags &= ~(SEC_ACE_FLAG_VALID_INHERIT);
3368 }
3369 new_ace[i].flags |= SEC_ACE_FLAG_INHERITED_ACE;
3370
3371 if (fsp->is_directory) {
3372 /*
3373 * Strip off any inherit only. It's applied.
3374 */
3375 new_ace[i].flags &= ~(SEC_ACE_FLAG_INHERIT_ONLY);
3376 if (se->flags & SEC_ACE_FLAG_NO_PROPAGATE_INHERIT) {
3377 /* No further inheritance. */
3378 new_ace[i].flags &=
3379 ~(SEC_ACE_FLAG_CONTAINER_INHERIT|
3380 SEC_ACE_FLAG_OBJECT_INHERIT);
3381 }
3382 } else {
3383 /*
3384 * Strip off any container or inherit
3385 * flags, they can't apply to objects.
3386 */
3387 new_ace[i].flags &= ~(SEC_ACE_FLAG_CONTAINER_INHERIT|
3388 SEC_ACE_FLAG_INHERIT_ONLY|
3389 SEC_ACE_FLAG_NO_PROPAGATE_INHERIT);
3390 }
3391 i++;
3392
3393 DEBUG(10,("append_parent_acl: path %s "
3394 "inheriting ACE with sid %s "
3395 "from parent %s\n",
3396 fsp->fsp_name,
3397 sid_string_dbg(&se->trustee),
3398 parent_name));
3399 }
3400
3401 /* This sucks. psd should be const and we should
3402 * be doing a deep-copy here. We're getting away
3403 * with is as we know parent_sd is talloced off
3404 * talloc_tos() as well as psd. JRA. */
3405
3406 psd->dacl->aces = new_ace;
3407 psd->dacl->num_aces = i;
3408 psd->type &= ~(SE_DESC_DACL_AUTO_INHERITED|
3409 SE_DESC_DACL_AUTO_INHERIT_REQ);
3410
3411 *pp_new_sd = psd;
3412 return status;
3413 }
3414
3415 /****************************************************************************
3416 Reply to set a security descriptor on an fsp. security_info_sent is the
3417 description of the following NT ACL.
3418 This should be the only external function needed for the UNIX style set ACL.
3419 ****************************************************************************/
3420
3421 NTSTATUS set_nt_acl(files_struct *fsp, uint32 security_info_sent, SEC_DESC *psd)
3422 {
3423 connection_struct *conn = fsp->conn;
3424 uid_t user = (uid_t)-1;
3425 gid_t grp = (gid_t)-1;
3426 SMB_STRUCT_STAT sbuf;
3427 DOM_SID file_owner_sid;
3428 DOM_SID file_grp_sid;
3429 canon_ace *file_ace_list = NULL;
3430 canon_ace *dir_ace_list = NULL;
3431 bool acl_perms = False;
3432 mode_t orig_mode = (mode_t)0;
3433 NTSTATUS status;
3434 uid_t orig_uid;
3435 gid_t orig_gid;
3436 bool need_chown = False;
3437
3438 DEBUG(10,("set_nt_acl: called for file %s\n", fsp->fsp_name ));
3439
3440 if (!CAN_WRITE(conn)) {
3441 DEBUG(10,("set acl rejected on read-only share\n"));
3442 return NT_STATUS_MEDIA_WRITE_PROTECTED;
3443 }
3444
3445 /*
3446 * Get the current state of the file.
3447 */
3448
3449 if(fsp->is_directory || fsp->fh->fd == -1) {
3450 if(SMB_VFS_STAT(fsp->conn,fsp->fsp_name, &sbuf) != 0)
3451 return map_nt_error_from_unix(errno);
3452 } else {
3453 if(SMB_VFS_FSTAT(fsp, &sbuf) != 0)
3454 return map_nt_error_from_unix(errno);
3455 }
3456
3457 /* Save the original elements we check against. */
3458 orig_mode = sbuf.st_mode;
3459 orig_uid = sbuf.st_uid;
3460 orig_gid = sbuf.st_gid;
3461
3462 /*
3463 * Unpack the user/group/world id's.
3464 */
3465
3466 status = unpack_nt_owners( SNUM(conn), &user, &grp, security_info_sent, psd);
3467 if (!NT_STATUS_IS_OK(status)) {
3468 return status;
3469 }
3470
3471 /*
3472 * Do we need to chown ?
3473 */
3474
3475 if (((user != (uid_t)-1) && (orig_uid != user)) || (( grp != (gid_t)-1) && (orig_gid != grp))) {
3476 need_chown = True;
3477 }
3478
3479 if (need_chown && (user == (uid_t)-1 || user == current_user.ut.uid)) {
3480
3481 DEBUG(3,("set_nt_acl: chown %s. uid = %u, gid = %u.\n",
3482 fsp->fsp_name, (unsigned int)user, (unsigned int)grp ));
3483
3484 if(try_chown( fsp->conn, fsp->fsp_name, user, grp) == -1) {
3485 DEBUG(3,("set_nt_acl: chown %s, %u, %u failed. Error = %s.\n",
3486 fsp->fsp_name, (unsigned int)user, (unsigned int)grp, strerror(errno) ));
3487 if (errno == EPERM) {
3488 return NT_STATUS_INVALID_OWNER;
3489 }
3490 return map_nt_error_from_unix(errno);
3491 }
3492
3493 /*
3494 * Recheck the current state of the file, which may have changed.
3495 * (suid/sgid bits, for instance)
3496 */
3497
3498 if(fsp->is_directory) {
3499 if(SMB_VFS_STAT(fsp->conn, fsp->fsp_name, &sbuf) != 0) {
3500 return map_nt_error_from_unix(errno);
3501 }
3502 } else {
3503
3504 int ret;
3505
3506 if(fsp->fh->fd == -1)
3507 ret = SMB_VFS_STAT(fsp->conn, fsp->fsp_name, &sbuf);
3508 else
3509 ret = SMB_VFS_FSTAT(fsp, &sbuf);
3510
3511 if(ret != 0)
3512 return map_nt_error_from_unix(errno);
3513 }
3514
3515 /* Save the original elements we check against. */
3516 orig_mode = sbuf.st_mode;
3517 orig_uid = sbuf.st_uid;
3518 orig_gid = sbuf.st_gid;
3519
3520 /* We did chown already, drop the flag */
3521 need_chown = False;
3522 }
3523
3524 create_file_sids(&sbuf, &file_owner_sid, &file_grp_sid);
3525
3526 if ((security_info_sent & DACL_SECURITY_INFORMATION) &&
3527 psd->dacl != NULL &&
3528 (psd->type & (SE_DESC_DACL_AUTO_INHERITED|
3529 SE_DESC_DACL_AUTO_INHERIT_REQ))==
3530 (SE_DESC_DACL_AUTO_INHERITED|
3531 SE_DESC_DACL_AUTO_INHERIT_REQ) ) {
3532 status = append_parent_acl(fsp, &sbuf, psd, &psd);
3533 if (!NT_STATUS_IS_OK(status)) {
3534 return status;
3535 }
3536 }
3537
3538 acl_perms = unpack_canon_ace( fsp, &sbuf, &file_owner_sid, &file_grp_sid,
3539 &file_ace_list, &dir_ace_list, security_info_sent, psd);
3540
3541 /* Ignore W2K traverse DACL set. */
3542 if (file_ace_list || dir_ace_list) {
3543
3544 if (!acl_perms) {
3545 DEBUG(3,("set_nt_acl: cannot set permissions\n"));
3546 free_canon_ace_list(file_ace_list);
3547 free_canon_ace_list(dir_ace_list);
3548 return NT_STATUS_ACCESS_DENIED;
3549 }
3550
3551 /*
3552 * Only change security if we got a DACL.
3553 */
3554
3555 if((security_info_sent & DACL_SECURITY_INFORMATION) && (psd->dacl != NULL)) {
3556
3557 bool acl_set_support = False;
3558 bool ret = False;
3559
3560 /*
3561 * Try using the POSIX ACL set first. Fall back to chmod if
3562 * we have no ACL support on this filesystem.
3563 */
3564
3565 if (acl_perms && file_ace_list) {
3566 ret = set_canon_ace_list(fsp, file_ace_list, False, sbuf.st_gid, &acl_set_support);
3567 if (acl_set_support && ret == False) {
3568 DEBUG(3,("set_nt_acl: failed to set file acl on file %s (%s).\n", fsp->fsp_name, strerror(errno) ));
3569 free_canon_ace_list(file_ace_list);
3570 free_canon_ace_list(dir_ace_list);
3571 return map_nt_error_from_unix(errno);
3572 }
3573 }
3574
3575 if (acl_perms && acl_set_support && fsp->is_directory) {
3576 if (dir_ace_list) {
3577 if (!set_canon_ace_list(fsp, dir_ace_list, True, sbuf.st_gid, &acl_set_support)) {
3578 DEBUG(3,("set_nt_acl: failed to set default acl on directory %s (%s).\n", fsp->fsp_name, strerror(errno) ));
3579 free_canon_ace_list(file_ace_list);
3580 free_canon_ace_list(dir_ace_list);
3581 return map_nt_error_from_unix(errno);
3582 }
3583 } else {
3584
3585 /*
3586 * No default ACL - delete one if it exists.
3587 */
3588
3589 if (SMB_VFS_SYS_ACL_DELETE_DEF_FILE(conn, fsp->fsp_name) == -1) {
3590 int sret = -1;
3591
3592 if (acl_group_override(conn, sbuf.st_gid, fsp->fsp_name)) {
3593 DEBUG(5,("set_nt_acl: acl group control on and "
3594 "current user in file %s primary group. Override delete_def_acl\n",
3595 fsp->fsp_name ));
3596
3597 become_root();
3598 sret = SMB_VFS_SYS_ACL_DELETE_DEF_FILE(conn, fsp->fsp_name);
3599 unbecome_root();
3600 }
3601
3602 if (sret == -1) {
3603 DEBUG(3,("set_nt_acl: sys_acl_delete_def_file failed (%s)\n", strerror(errno)));
3604 free_canon_ace_list(file_ace_list);
3605 free_canon_ace_list(dir_ace_list);
3606 return map_nt_error_from_unix(errno);
3607 }
3608 }
3609 }
3610 }
3611
3612 if (acl_set_support) {
3613 store_inheritance_attributes(fsp, file_ace_list, dir_ace_list,
3614 (psd->type & SE_DESC_DACL_PROTECTED) ? True : False);
3615 }
3616
3617 /*
3618 * If we cannot set using POSIX ACLs we fall back to checking if we need to chmod.
3619 */
3620
3621 if(!acl_set_support && acl_perms) {
3622 mode_t posix_perms;
3623
3624 if (!convert_canon_ace_to_posix_perms( fsp, file_ace_list, &posix_perms)) {
3625 free_canon_ace_list(file_ace_list);
3626 free_canon_ace_list(dir_ace_list);
3627 DEBUG(3,("set_nt_acl: failed to convert file acl to posix permissions for file %s.\n",
3628 fsp->fsp_name ));
3629 return NT_STATUS_ACCESS_DENIED;
3630 }
3631
3632 if (orig_mode != posix_perms) {
3633
3634 DEBUG(3,("set_nt_acl: chmod %s. perms = 0%o.\n",
3635 fsp->fsp_name, (unsigned int)posix_perms ));
3636
3637 if(SMB_VFS_CHMOD(conn,fsp->fsp_name, posix_perms) == -1) {
3638 int sret = -1;
3639 if (acl_group_override(conn, sbuf.st_gid, fsp->fsp_name)) {
3640 DEBUG(5,("set_nt_acl: acl group control on and "
3641 "current user in file %s primary group. Override chmod\n",
3642 fsp->fsp_name ));
3643
3644 become_root();
3645 sret = SMB_VFS_CHMOD(conn,fsp->fsp_name, posix_perms);
3646 unbecome_root();
3647 }
3648
3649 if (sret == -1) {
3650 DEBUG(3,("set_nt_acl: chmod %s, 0%o failed. Error = %s.\n",
3651 fsp->fsp_name, (unsigned int)posix_perms, strerror(errno) ));
3652 free_canon_ace_list(file_ace_list);
3653 free_canon_ace_list(dir_ace_list);
3654 return map_nt_error_from_unix(errno);
3655 }
3656 }
3657 }
3658 }
3659 }
3660
3661 free_canon_ace_list(file_ace_list);
3662 free_canon_ace_list(dir_ace_list);
3663 }
3664
3665 /* Any chown pending? */
3666 if (need_chown) {
3667 DEBUG(3,("set_nt_acl: chown %s. uid = %u, gid = %u.\n",
3668 fsp->fsp_name, (unsigned int)user, (unsigned int)grp ));
3669
3670 if(try_chown( fsp->conn, fsp->fsp_name, user, grp) == -1) {
3671 DEBUG(3,("set_nt_acl: chown %s, %u, %u failed. Error = %s.\n",
3672 fsp->fsp_name, (unsigned int)user, (unsigned int)grp, strerror(errno) ));
3673 if (errno == EPERM) {
3674 return NT_STATUS_INVALID_OWNER;
3675 }
3676 return map_nt_error_from_unix(errno);
3677 }
3678 }
3679
3680 return NT_STATUS_OK;
3681 }
3682
3683 /****************************************************************************
3684 Get the actual group bits stored on a file with an ACL. Has no effect if
3685 the file has no ACL. Needed in dosmode code where the stat() will return
3686 the mask bits, not the real group bits, for a file with an ACL.
3687 ****************************************************************************/
3688
3689 int get_acl_group_bits( connection_struct *conn, const char *fname, mode_t *mode )
3690 {
3691 int entry_id = SMB_ACL_FIRST_ENTRY;
3692 SMB_ACL_ENTRY_T entry;
3693 SMB_ACL_T posix_acl;
3694 int result = -1;
3695
3696 posix_acl = SMB_VFS_SYS_ACL_GET_FILE(conn, fname, SMB_ACL_TYPE_ACCESS);
3697 if (posix_acl == (SMB_ACL_T)NULL)
3698 return -1;
3699
3700 while (SMB_VFS_SYS_ACL_GET_ENTRY(conn, posix_acl, entry_id, &entry) == 1) {
3701 SMB_ACL_TAG_T tagtype;
3702 SMB_ACL_PERMSET_T permset;
3703
3704 entry_id = SMB_ACL_NEXT_ENTRY;
3705
3706 if (SMB_VFS_SYS_ACL_GET_TAG_TYPE(conn, entry, &tagtype) ==-1)
3707 break;
3708
3709 if (tagtype == SMB_ACL_GROUP_OBJ) {
3710 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, entry, &permset) == -1) {
3711 break;
3712 } else {
3713 *mode &= ~(S_IRGRP|S_IWGRP|S_IXGRP);
3714 *mode |= (SMB_VFS_SYS_ACL_GET_PERM(conn, permset, SMB_ACL_READ) ? S_IRGRP : 0);
3715 *mode |= (SMB_VFS_SYS_ACL_GET_PERM(conn, permset, SMB_ACL_WRITE) ? S_IWGRP : 0);
3716 *mode |= (SMB_VFS_SYS_ACL_GET_PERM(conn, permset, SMB_ACL_EXECUTE) ? S_IXGRP : 0);
3717 result = 0;
3718 break;
3719 }
3720 }
3721 }
3722 SMB_VFS_SYS_ACL_FREE_ACL(conn, posix_acl);
3723 return result;
3724 }
3725
3726 /****************************************************************************
3727 Do a chmod by setting the ACL USER_OBJ, GROUP_OBJ and OTHER bits in an ACL
3728 and set the mask to rwx. Needed to preserve complex ACLs set by NT.
3729 ****************************************************************************/
3730
3731 static int chmod_acl_internals( connection_struct *conn, SMB_ACL_T posix_acl, mode_t mode)
3732 {
3733 int entry_id = SMB_ACL_FIRST_ENTRY;
3734 SMB_ACL_ENTRY_T entry;
3735 int num_entries = 0;
3736
3737 while ( SMB_VFS_SYS_ACL_GET_ENTRY(conn, posix_acl, entry_id, &entry) == 1) {
3738 SMB_ACL_TAG_T tagtype;
3739 SMB_ACL_PERMSET_T permset;
3740 mode_t perms;
3741
3742 entry_id = SMB_ACL_NEXT_ENTRY;
3743
3744 if (SMB_VFS_SYS_ACL_GET_TAG_TYPE(conn, entry, &tagtype) == -1)
3745 return -1;
3746
3747 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, entry, &permset) == -1)
3748 return -1;
3749
3750 num_entries++;
3751
3752 switch(tagtype) {
3753 case SMB_ACL_USER_OBJ:
3754 perms = unix_perms_to_acl_perms(mode, S_IRUSR, S_IWUSR, S_IXUSR);
3755 break;
3756 case SMB_ACL_GROUP_OBJ:
3757 perms = unix_perms_to_acl_perms(mode, S_IRGRP, S_IWGRP, S_IXGRP);
3758 break;
3759 case SMB_ACL_MASK:
3760 /*
3761 * FIXME: The ACL_MASK entry permissions should really be set to
3762 * the union of the permissions of all ACL_USER,
3763 * ACL_GROUP_OBJ, and ACL_GROUP entries. That's what
3764 * acl_calc_mask() does, but Samba ACLs doesn't provide it.
3765 */
3766 perms = S_IRUSR|S_IWUSR|S_IXUSR;
3767 break;
3768 case SMB_ACL_OTHER:
3769 perms = unix_perms_to_acl_perms(mode, S_IROTH, S_IWOTH, S_IXOTH);
3770 break;
3771 default:
3772 continue;
3773 }
3774
3775 if (map_acl_perms_to_permset(conn, perms, &permset) == -1)
3776 return -1;
3777
3778 if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, entry, permset) == -1)
3779 return -1;
3780 }
3781
3782 /*
3783 * If this is a simple 3 element ACL or no elements then it's a standard
3784 * UNIX permission set. Just use chmod...
3785 */
3786
3787 if ((num_entries == 3) || (num_entries == 0))
3788 return -1;
3789
3790 return 0;
3791 }
3792
3793 /****************************************************************************
3794 Get the access ACL of FROM, do a chmod by setting the ACL USER_OBJ,
3795 GROUP_OBJ and OTHER bits in an ACL and set the mask to rwx. Set the
3796 resulting ACL on TO. Note that name is in UNIX character set.
3797 ****************************************************************************/
3798
3799 static int copy_access_posix_acl(connection_struct *conn, const char *from, const char *to, mode_t mode)
3800 {
3801 SMB_ACL_T posix_acl = NULL;
3802 int ret = -1;
3803
3804 if ((posix_acl = SMB_VFS_SYS_ACL_GET_FILE(conn, from, SMB_ACL_TYPE_ACCESS)) == NULL)
3805 return -1;
3806
3807 if ((ret = chmod_acl_internals(conn, posix_acl, mode)) == -1)
3808 goto done;
3809
3810 ret = SMB_VFS_SYS_ACL_SET_FILE(conn, to, SMB_ACL_TYPE_ACCESS, posix_acl);
3811
3812 done:
3813
3814 SMB_VFS_SYS_ACL_FREE_ACL(conn, posix_acl);
3815 return ret;
3816 }
3817
3818 /****************************************************************************
3819 Do a chmod by setting the ACL USER_OBJ, GROUP_OBJ and OTHER bits in an ACL
3820 and set the mask to rwx. Needed to preserve complex ACLs set by NT.
3821 Note that name is in UNIX character set.
3822 ****************************************************************************/
3823
3824 int chmod_acl(connection_struct *conn, const char *name, mode_t mode)
3825 {
3826 return copy_access_posix_acl(conn, name, name, mode);
3827 }
3828
3829 /****************************************************************************
3830 Check for an existing default POSIX ACL on a directory.
3831 ****************************************************************************/
3832
3833 static bool directory_has_default_posix_acl(connection_struct *conn, const char *fname)
3834 {
3835 SMB_ACL_T def_acl = SMB_VFS_SYS_ACL_GET_FILE( conn, fname, SMB_ACL_TYPE_DEFAULT);
3836 bool has_acl = False;
3837 SMB_ACL_ENTRY_T entry;
3838
3839 if (def_acl != NULL && (SMB_VFS_SYS_ACL_GET_ENTRY(conn, def_acl, SMB_ACL_FIRST_ENTRY, &entry) == 1)) {
3840 has_acl = True;
3841 }
3842
3843 if (def_acl) {
3844 SMB_VFS_SYS_ACL_FREE_ACL(conn, def_acl);
3845 }
3846 return has_acl;
3847 }
3848
3849 /****************************************************************************
3850 If the parent directory has no default ACL but it does have an Access ACL,
3851 inherit this Access ACL to file name.
3852 ****************************************************************************/
3853
3854 int inherit_access_posix_acl(connection_struct *conn, const char *inherit_from_dir,
3855 const char *name, mode_t mode)
3856 {
3857 if (directory_has_default_posix_acl(conn, inherit_from_dir))
3858 return 0;
3859
3860 return copy_access_posix_acl(conn, inherit_from_dir, name, mode);
3861 }
3862
3863 /****************************************************************************
3864 Do an fchmod by setting the ACL USER_OBJ, GROUP_OBJ and OTHER bits in an ACL
3865 and set the mask to rwx. Needed to preserve complex ACLs set by NT.
3866 ****************************************************************************/
3867
3868 int fchmod_acl(files_struct *fsp, mode_t mode)
3869 {
3870 connection_struct *conn = fsp->conn;
3871 SMB_ACL_T posix_acl = NULL;
3872 int ret = -1;
3873
3874 if ((posix_acl = SMB_VFS_SYS_ACL_GET_FD(fsp)) == NULL)
3875 return -1;
3876
3877 if ((ret = chmod_acl_internals(conn, posix_acl, mode)) == -1)
3878 goto done;
3879
3880 ret = SMB_VFS_SYS_ACL_SET_FD(fsp, posix_acl);
3881
3882 done:
3883
3884 SMB_VFS_SYS_ACL_FREE_ACL(conn, posix_acl);
3885 return ret;
3886 }
3887
3888 /****************************************************************************
3889 Map from wire type to permset.
3890 ****************************************************************************/
3891
3892 static bool unix_ex_wire_to_permset(connection_struct *conn, unsigned char wire_perm, SMB_ACL_PERMSET_T *p_permset)
3893 {
3894 if (wire_perm & ~(SMB_POSIX_ACL_READ|SMB_POSIX_ACL_WRITE|SMB_POSIX_ACL_EXECUTE)) {
3895 return False;
3896 }
3897
3898 if (SMB_VFS_SYS_ACL_CLEAR_PERMS(conn, *p_permset) == -1) {
3899 return False;
3900 }
3901
3902 if (wire_perm & SMB_POSIX_ACL_READ) {
3903 if (SMB_VFS_SYS_ACL_ADD_PERM(conn, *p_permset, SMB_ACL_READ) == -1) {
3904 return False;
3905 }
3906 }
3907 if (wire_perm & SMB_POSIX_ACL_WRITE) {
3908 if (SMB_VFS_SYS_ACL_ADD_PERM(conn, *p_permset, SMB_ACL_WRITE) == -1) {
3909 return False;
3910 }
3911 }
3912 if (wire_perm & SMB_POSIX_ACL_EXECUTE) {
3913 if (SMB_VFS_SYS_ACL_ADD_PERM(conn, *p_permset, SMB_ACL_EXECUTE) == -1) {
3914 return False;
3915 }
3916 }
3917 return True;
3918 }
3919
3920 /****************************************************************************
3921 Map from wire type to tagtype.
3922 ****************************************************************************/
3923
3924 static bool unix_ex_wire_to_tagtype(unsigned char wire_tt, SMB_ACL_TAG_T *p_tt)
3925 {
3926 switch (wire_tt) {
3927 case SMB_POSIX_ACL_USER_OBJ:
3928 *p_tt = SMB_ACL_USER_OBJ;
3929 break;
3930 case SMB_POSIX_ACL_USER:
3931 *p_tt = SMB_ACL_USER;
3932 break;
3933 case SMB_POSIX_ACL_GROUP_OBJ:
3934 *p_tt = SMB_ACL_GROUP_OBJ;
3935 break;
3936 case SMB_POSIX_ACL_GROUP:
3937 *p_tt = SMB_ACL_GROUP;
3938 break;
3939 case SMB_POSIX_ACL_MASK:
3940 *p_tt = SMB_ACL_MASK;
3941 break;
3942 case SMB_POSIX_ACL_OTHER:
3943 *p_tt = SMB_ACL_OTHER;
3944 break;
3945 default:
3946 return False;
3947 }
3948 return True;
3949 }
3950
3951 /****************************************************************************
3952 Create a new POSIX acl from wire permissions.
3953 FIXME ! How does the share mask/mode fit into this.... ?
3954 ****************************************************************************/
3955
3956 static SMB_ACL_T create_posix_acl_from_wire(connection_struct *conn, uint16 num_acls, const char *pdata)
3957 {
3958 unsigned int i;
3959 SMB_ACL_T the_acl = SMB_VFS_SYS_ACL_INIT(conn, num_acls);
3960
3961 if (the_acl == NULL) {
3962 return NULL;
3963 }
3964
3965 for (i = 0; i < num_acls; i++) {
3966 SMB_ACL_ENTRY_T the_entry;
3967 SMB_ACL_PERMSET_T the_permset;
3968 SMB_ACL_TAG_T tag_type;
3969
3970 if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &the_acl, &the_entry) == -1) {
3971 DEBUG(0,("create_posix_acl_from_wire: Failed to create entry %u. (%s)\n",
3972 i, strerror(errno) ));
3973 goto fail;
3974 }
3975
3976 if (!unix_ex_wire_to_tagtype(CVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)), &tag_type)) {
3977 DEBUG(0,("create_posix_acl_from_wire: invalid wire tagtype %u on entry %u.\n",
3978 CVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)), i ));
3979 goto fail;
3980 }
3981
3982 if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, the_entry, tag_type) == -1) {
3983 DEBUG(0,("create_posix_acl_from_wire: Failed to set tagtype on entry %u. (%s)\n",
3984 i, strerror(errno) ));
3985 goto fail;
3986 }
3987
3988 /* Get the permset pointer from the new ACL entry. */
3989 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, the_entry, &the_permset) == -1) {
3990 DEBUG(0,("create_posix_acl_from_wire: Failed to get permset on entry %u. (%s)\n",
3991 i, strerror(errno) ));
3992 goto fail;
3993 }
3994
3995 /* Map from wire to permissions. */
3996 if (!unix_ex_wire_to_permset(conn, CVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)+1), &the_permset)) {
3997 DEBUG(0,("create_posix_acl_from_wire: invalid permset %u on entry %u.\n",
3998 CVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE) + 1), i ));
3999 goto fail;
4000 }
4001
4002 /* Now apply to the new ACL entry. */
4003 if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, the_entry, the_permset) == -1) {
4004 DEBUG(0,("create_posix_acl_from_wire: Failed to add permset on entry %u. (%s)\n",
4005 i, strerror(errno) ));
4006 goto fail;
4007 }
4008
4009 if (tag_type == SMB_ACL_USER) {
4010 uint32 uidval = IVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)+2);
4011 uid_t uid = (uid_t)uidval;
4012 if (SMB_VFS_SYS_ACL_SET_QUALIFIER(conn, the_entry,(void *)&uid) == -1) {
4013 DEBUG(0,("create_posix_acl_from_wire: Failed to set uid %u on entry %u. (%s)\n",
4014 (unsigned int)uid, i, strerror(errno) ));
4015 goto fail;
4016 }
4017 }
4018
4019 if (tag_type == SMB_ACL_GROUP) {
4020 uint32 gidval = IVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)+2);
4021 gid_t gid = (uid_t)gidval;
4022 if (SMB_VFS_SYS_ACL_SET_QUALIFIER(conn, the_entry,(void *)&gid) == -1) {
4023 DEBUG(0,("create_posix_acl_from_wire: Failed to set gid %u on entry %u. (%s)\n",
4024 (unsigned int)gid, i, strerror(errno) ));
4025 goto fail;
4026 }
4027 }
4028 }
4029
4030 return the_acl;
4031
4032 fail:
4033
4034 if (the_acl != NULL) {
4035 SMB_VFS_SYS_ACL_FREE_ACL(conn, the_acl);
4036 }
4037 return NULL;
4038 }
4039
4040 /****************************************************************************
4041 Calls from UNIX extensions - Default POSIX ACL set.
4042 If num_def_acls == 0 and not a directory just return. If it is a directory
4043 and num_def_acls == 0 then remove the default acl. Else set the default acl
4044 on the directory.
4045 ****************************************************************************/
4046
4047 bool set_unix_posix_default_acl(connection_struct *conn, const char *fname, SMB_STRUCT_STAT *psbuf,
4048 uint16 num_def_acls, const char *pdata)
4049 {
4050 SMB_ACL_T def_acl = NULL;
4051
4052 if (num_def_acls && !S_ISDIR(psbuf->st_mode)) {
4053 DEBUG(5,("set_unix_posix_default_acl: Can't set default ACL on non-directory file %s\n", fname ));
4054 errno = EISDIR;
4055 return False;
4056 }
4057
4058 if (!num_def_acls) {
4059 /* Remove the default ACL. */
4060 if (SMB_VFS_SYS_ACL_DELETE_DEF_FILE(conn, fname) == -1) {
4061 DEBUG(5,("set_unix_posix_default_acl: acl_delete_def_file failed on directory %s (%s)\n",
4062 fname, strerror(errno) ));
4063 return False;
4064 }
4065 return True;
4066 }
4067
4068 if ((def_acl = create_posix_acl_from_wire(conn, num_def_acls, pdata)) == NULL) {
4069 return False;
4070 }
4071
4072 if (SMB_VFS_SYS_ACL_SET_FILE(conn, fname, SMB_ACL_TYPE_DEFAULT, def_acl) == -1) {
4073 DEBUG(5,("set_unix_posix_default_acl: acl_set_file failed on directory %s (%s)\n",
4074 fname, strerror(errno) ));
4075 SMB_VFS_SYS_ACL_FREE_ACL(conn, def_acl);
4076 return False;
4077 }
4078
4079 DEBUG(10,("set_unix_posix_default_acl: set default acl for file %s\n", fname ));
4080 SMB_VFS_SYS_ACL_FREE_ACL(conn, def_acl);
4081 return True;
4082 }
4083
4084 /****************************************************************************
4085 Remove an ACL from a file. As we don't have acl_delete_entry() available
4086 we must read the current acl and copy all entries except MASK, USER and GROUP
4087 to a new acl, then set that. This (at least on Linux) causes any ACL to be
4088 removed.
4089 FIXME ! How does the share mask/mode fit into this.... ?
4090 ****************************************************************************/
4091
4092 static bool remove_posix_acl(connection_struct *conn, files_struct *fsp, const char *fname)
4093 {
4094 SMB_ACL_T file_acl = NULL;
4095 int entry_id = SMB_ACL_FIRST_ENTRY;
4096 SMB_ACL_ENTRY_T entry;
4097 bool ret = False;
4098 /* Create a new ACL with only 3 entries, u/g/w. */
4099 SMB_ACL_T new_file_acl = SMB_VFS_SYS_ACL_INIT(conn, 3);
4100 SMB_ACL_ENTRY_T user_ent = NULL;
4101 SMB_ACL_ENTRY_T group_ent = NULL;
4102 SMB_ACL_ENTRY_T other_ent = NULL;
4103
4104 if (new_file_acl == NULL) {
4105 DEBUG(5,("remove_posix_acl: failed to init new ACL with 3 entries for file %s.\n", fname));
4106 return False;
4107 }
4108
4109 /* Now create the u/g/w entries. */
4110 if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &new_file_acl, &user_ent) == -1) {
4111 DEBUG(5,("remove_posix_acl: Failed to create user entry for file %s. (%s)\n",
4112 fname, strerror(errno) ));
4113 goto done;
4114 }
4115 if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, user_ent, SMB_ACL_USER_OBJ) == -1) {
4116 DEBUG(5,("remove_posix_acl: Failed to set user entry for file %s. (%s)\n",
4117 fname, strerror(errno) ));
4118 goto done;
4119 }
4120
4121 if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &new_file_acl, &group_ent) == -1) {
4122 DEBUG(5,("remove_posix_acl: Failed to create group entry for file %s. (%s)\n",
4123 fname, strerror(errno) ));
4124 goto done;
4125 }
4126 if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, group_ent, SMB_ACL_GROUP_OBJ) == -1) {
4127 DEBUG(5,("remove_posix_acl: Failed to set group entry for file %s. (%s)\n",
4128 fname, strerror(errno) ));
4129 goto done;
4130 }
4131
4132 if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &new_file_acl, &other_ent) == -1) {
4133 DEBUG(5,("remove_posix_acl: Failed to create other entry for file %s. (%s)\n",
4134 fname, strerror(errno) ));
4135 goto done;
4136 }
4137 if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, other_ent, SMB_ACL_OTHER) == -1) {
4138 DEBUG(5,("remove_posix_acl: Failed to set other entry for file %s. (%s)\n",
4139 fname, strerror(errno) ));
4140 goto done;
4141 }
4142
4143 /* Get the current file ACL. */
4144 if (fsp && fsp->fh->fd != -1) {
4145 file_acl = SMB_VFS_SYS_ACL_GET_FD(fsp);
4146 } else {
4147 file_acl = SMB_VFS_SYS_ACL_GET_FILE( conn, fname, SMB_ACL_TYPE_ACCESS);
4148 }
4149
4150 if (file_acl == NULL) {
4151 /* This is only returned if an error occurred. Even for a file with
4152 no acl a u/g/w acl should be returned. */
4153 DEBUG(5,("remove_posix_acl: failed to get ACL from file %s (%s).\n",
4154 fname, strerror(errno) ));
4155 goto done;
4156 }
4157
4158 while ( SMB_VFS_SYS_ACL_GET_ENTRY(conn, file_acl, entry_id, &entry) == 1) {
4159 SMB_ACL_TAG_T tagtype;
4160 SMB_ACL_PERMSET_T permset;
4161
4162 entry_id = SMB_ACL_NEXT_ENTRY;
4163
4164 if (SMB_VFS_SYS_ACL_GET_TAG_TYPE(conn, entry, &tagtype) == -1) {
4165 DEBUG(5,("remove_posix_acl: failed to get tagtype from ACL on file %s (%s).\n",
4166 fname, strerror(errno) ));
4167 goto done;
4168 }
4169
4170 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, entry, &permset) == -1) {
4171 DEBUG(5,("remove_posix_acl: failed to get permset from ACL on file %s (%s).\n",
4172 fname, strerror(errno) ));
4173 goto done;
4174 }
4175
4176 if (tagtype == SMB_ACL_USER_OBJ) {
4177 if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, user_ent, permset) == -1) {
4178 DEBUG(5,("remove_posix_acl: failed to set permset from ACL on file %s (%s).\n",
4179 fname, strerror(errno) ));
4180 }
4181 } else if (tagtype == SMB_ACL_GROUP_OBJ) {
4182 if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, group_ent, permset) == -1) {
4183 DEBUG(5,("remove_posix_acl: failed to set permset from ACL on file %s (%s).\n",
4184 fname, strerror(errno) ));
4185 }
4186 } else if (tagtype == SMB_ACL_OTHER) {
4187 if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, other_ent, permset) == -1) {
4188 DEBUG(5,("remove_posix_acl: failed to set permset from ACL on file %s (%s).\n",
4189 fname, strerror(errno) ));
4190 }
4191 }
4192 }
4193
4194 /* Set the new empty file ACL. */
4195 if (fsp && fsp->fh->fd != -1) {
4196 if (SMB_VFS_SYS_ACL_SET_FD(fsp, new_file_acl) == -1) {
4197 DEBUG(5,("remove_posix_acl: acl_set_file failed on %s (%s)\n",
4198 fname, strerror(errno) ));
4199 goto done;
4200 }
4201 } else {
4202 if (SMB_VFS_SYS_ACL_SET_FILE(conn, fname, SMB_ACL_TYPE_ACCESS, new_file_acl) == -1) {
4203 DEBUG(5,("remove_posix_acl: acl_set_file failed on %s (%s)\n",
4204 fname, strerror(errno) ));
4205 goto done;
4206 }
4207 }
4208
4209 ret = True;
4210
4211 done:
4212
4213 if (file_acl) {
4214 SMB_VFS_SYS_ACL_FREE_ACL(conn, file_acl);
4215 }
4216 if (new_file_acl) {
4217 SMB_VFS_SYS_ACL_FREE_ACL(conn, new_file_acl);
4218 }
4219 return ret;
4220 }
4221
4222 /****************************************************************************
4223 Calls from UNIX extensions - POSIX ACL set.
4224 If num_def_acls == 0 then read/modify/write acl after removing all entries
4225 except SMB_ACL_USER_OBJ, SMB_ACL_GROUP_OBJ, SMB_ACL_OTHER.
4226 ****************************************************************************/
4227
4228 bool set_unix_posix_acl(connection_struct *conn, files_struct *fsp, const char *fname, uint16 num_acls, const char *pdata)
4229 {
4230 SMB_ACL_T file_acl = NULL;
4231
4232 if (!num_acls) {
4233 /* Remove the ACL from the file. */
4234 return remove_posix_acl(conn, fsp, fname);
4235 }
4236
4237 if ((file_acl = create_posix_acl_from_wire(conn, num_acls, pdata)) == NULL) {
4238 return False;
4239 }
4240
4241 if (fsp && fsp->fh->fd != -1) {
4242 /* The preferred way - use an open fd. */
4243 if (SMB_VFS_SYS_ACL_SET_FD(fsp, file_acl) == -1) {
4244 DEBUG(5,("set_unix_posix_acl: acl_set_file failed on %s (%s)\n",
4245 fname, strerror(errno) ));
4246 SMB_VFS_SYS_ACL_FREE_ACL(conn, file_acl);
4247 return False;
4248 }
4249 } else {
4250 if (SMB_VFS_SYS_ACL_SET_FILE(conn, fname, SMB_ACL_TYPE_ACCESS, file_acl) == -1) {
4251 DEBUG(5,("set_unix_posix_acl: acl_set_file failed on %s (%s)\n",
4252 fname, strerror(errno) ));
4253 SMB_VFS_SYS_ACL_FREE_ACL(conn, file_acl);
4254 return False;
4255 }
4256 }
4257
4258 DEBUG(10,("set_unix_posix_acl: set acl for file %s\n", fname ));
4259 SMB_VFS_SYS_ACL_FREE_ACL(conn, file_acl);
4260 return True;
4261 }
4262
4263 /********************************************************************
4264 Pull the NT ACL from a file on disk or the OpenEventlog() access
4265 check. Caller is responsible for freeing the returned security
4266 descriptor via TALLOC_FREE(). This is designed for dealing with
4267 user space access checks in smbd outside of the VFS. For example,
4268 checking access rights in OpenEventlog().
4269
4270 Assume we are dealing with files (for now)
4271 ********************************************************************/
4272
4273 SEC_DESC *get_nt_acl_no_snum( TALLOC_CTX *ctx, const char *fname)
4274 {
4275 SEC_DESC *psd, *ret_sd;
4276 connection_struct *conn;
4277 files_struct finfo;
4278 struct fd_handle fh;
4279
4280 conn = TALLOC_ZERO_P(ctx, connection_struct);
4281 if (conn == NULL) {
4282 DEBUG(0, ("talloc failed\n"));
4283 return NULL;
4284 }
4285
4286 if (!(conn->params = TALLOC_P(conn, struct share_params))) {
4287 DEBUG(0,("get_nt_acl_no_snum: talloc() failed!\n"));
4288 TALLOC_FREE(conn);
4289 return NULL;
4290 }
4291
4292 conn->params->service = -1;
4293
4294 set_conn_connectpath(conn, "/");
4295
4296 if (!smbd_vfs_init(conn)) {
4297 DEBUG(0,("get_nt_acl_no_snum: Unable to create a fake connection struct!\n"));
4298 conn_free_internal( conn );
4299 return NULL;
4300 }
4301
4302 ZERO_STRUCT( finfo );
4303 ZERO_STRUCT( fh );
4304
4305 finfo.fnum = -1;
4306 finfo.conn = conn;
4307 finfo.fh = &fh;
4308 finfo.fh->fd = -1;
4309 finfo.fsp_name = CONST_DISCARD(char *,fname);
4310
4311 if (!NT_STATUS_IS_OK(posix_fget_nt_acl( &finfo, DACL_SECURITY_INFORMATION, &psd))) {
4312 DEBUG(0,("get_nt_acl_no_snum: get_nt_acl returned zero.\n"));
4313 conn_free_internal( conn );
4314 return NULL;
4315 }
4316
4317 ret_sd = dup_sec_desc( ctx, psd );
4318
4319 conn_free_internal( conn );
4320
4321 return ret_sd;
4322 }
WIP