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Fix the same bug with user -> user_obj.
[Samba.git] / source / smbd / posix_acls.c
blobf40a344124ebca5b498306d3e16b5cbf3c5e4d42
1 /*
2 Unix SMB/CIFS implementation.
3 SMB NT Security Descriptor / Unix permission conversion.
4 Copyright (C) Jeremy Allison 1994-2000.
5 Copyright (C) Andreas Gruenbacher 2002.
6
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 2 of the License, or
10 (at your option) any later version.
11
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
16
17 You should have received a copy of the GNU General Public License
18 along with this program; if not, write to the Free Software
19 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
20 */
21
22 #include "includes.h"
23
24 extern struct current_user current_user;
25 extern struct generic_mapping file_generic_mapping;
26
27 #undef DBGC_CLASS
28 #define DBGC_CLASS DBGC_ACLS
29
30 /****************************************************************************
31 Data structures representing the internal ACE format.
32 ****************************************************************************/
33
34 enum ace_owner {UID_ACE, GID_ACE, WORLD_ACE};
35 enum ace_attribute {ALLOW_ACE, DENY_ACE}; /* Used for incoming NT ACLS. */
36
37 typedef union posix_id {
38 uid_t uid;
39 gid_t gid;
40 int world;
41 } posix_id;
42
43 typedef struct canon_ace {
44 struct canon_ace *next, *prev;
45 SMB_ACL_TAG_T type;
46 mode_t perms; /* Only use S_I(R|W|X)USR mode bits here. */
47 DOM_SID trustee;
48 enum ace_owner owner_type;
49 enum ace_attribute attr;
50 posix_id unix_ug;
51 BOOL inherited;
52 } canon_ace;
53
54 #define ALL_ACE_PERMS (S_IRUSR|S_IWUSR|S_IXUSR)
55
56 /*
57 * EA format of user.SAMBA_PAI (Samba_Posix_Acl_Interitance)
58 * attribute on disk.
59 *
60 * | 1 | 1 | 2 | 2 | ....
61 * +------+------+-------------+---------------------+-------------+--------------------+
62 * | vers | flag | num_entries | num_default_entries | ..entries.. | default_entries... |
63 * +------+------+-------------+---------------------+-------------+--------------------+
64 */
65
66 #define PAI_VERSION_OFFSET 0
67 #define PAI_FLAG_OFFSET 1
68 #define PAI_NUM_ENTRIES_OFFSET 2
69 #define PAI_NUM_DEFAULT_ENTRIES_OFFSET 4
70 #define PAI_ENTRIES_BASE 6
71
72 #define PAI_VERSION 1
73 #define PAI_ACL_FLAG_PROTECTED 0x1
74 #define PAI_ENTRY_LENGTH 5
75
76 /*
77 * In memory format of user.SAMBA_PAI attribute.
78 */
79
80 struct pai_entry {
81 struct pai_entry *next, *prev;
82 enum ace_owner owner_type;
83 posix_id unix_ug;
84 };
85
86 struct pai_val {
87 BOOL pai_protected;
88 unsigned int num_entries;
89 struct pai_entry *entry_list;
90 unsigned int num_def_entries;
91 struct pai_entry *def_entry_list;
92 };
93
94 /************************************************************************
95 Return a uint32 of the pai_entry principal.
96 ************************************************************************/
97
98 static uint32 get_pai_entry_val(struct pai_entry *paie)
99 {
100 switch (paie->owner_type) {
101 case UID_ACE:
102 DEBUG(10,("get_pai_entry_val: uid = %u\n", (unsigned int)paie->unix_ug.uid ));
103 return (uint32)paie->unix_ug.uid;
104 case GID_ACE:
105 DEBUG(10,("get_pai_entry_val: gid = %u\n", (unsigned int)paie->unix_ug.gid ));
106 return (uint32)paie->unix_ug.gid;
107 case WORLD_ACE:
108 default:
109 DEBUG(10,("get_pai_entry_val: world ace\n"));
110 return (uint32)-1;
111 }
112 }
113
114 /************************************************************************
115 Return a uint32 of the entry principal.
116 ************************************************************************/
117
118 static uint32 get_entry_val(canon_ace *ace_entry)
119 {
120 switch (ace_entry->owner_type) {
121 case UID_ACE:
122 DEBUG(10,("get_entry_val: uid = %u\n", (unsigned int)ace_entry->unix_ug.uid ));
123 return (uint32)ace_entry->unix_ug.uid;
124 case GID_ACE:
125 DEBUG(10,("get_entry_val: gid = %u\n", (unsigned int)ace_entry->unix_ug.gid ));
126 return (uint32)ace_entry->unix_ug.gid;
127 case WORLD_ACE:
128 default:
129 DEBUG(10,("get_entry_val: world ace\n"));
130 return (uint32)-1;
131 }
132 }
133
134 /************************************************************************
135 Count the inherited entries.
136 ************************************************************************/
137
138 static unsigned int num_inherited_entries(canon_ace *ace_list)
139 {
140 unsigned int num_entries = 0;
141
142 for (; ace_list; ace_list = ace_list->next)
143 if (ace_list->inherited)
144 num_entries++;
145 return num_entries;
146 }
147
148 /************************************************************************
149 Create the on-disk format. Caller must free.
150 ************************************************************************/
151
152 static char *create_pai_buf(canon_ace *file_ace_list, canon_ace *dir_ace_list, BOOL pai_protected, size_t *store_size)
153 {
154 char *pai_buf = NULL;
155 canon_ace *ace_list = NULL;
156 char *entry_offset = NULL;
157 unsigned int num_entries = 0;
158 unsigned int num_def_entries = 0;
159
160 for (ace_list = file_ace_list; ace_list; ace_list = ace_list->next)
161 if (ace_list->inherited)
162 num_entries++;
163
164 for (ace_list = dir_ace_list; ace_list; ace_list = ace_list->next)
165 if (ace_list->inherited)
166 num_def_entries++;
167
168 DEBUG(10,("create_pai_buf: num_entries = %u, num_def_entries = %u\n", num_entries, num_def_entries ));
169
170 *store_size = PAI_ENTRIES_BASE + ((num_entries + num_def_entries)*PAI_ENTRY_LENGTH);
171
172 pai_buf = (char *)SMB_MALLOC(*store_size);
173 if (!pai_buf) {
174 return NULL;
175 }
176
177 /* Set up the header. */
178 memset(pai_buf, '\0', PAI_ENTRIES_BASE);
179 SCVAL(pai_buf,PAI_VERSION_OFFSET,PAI_VERSION);
180 SCVAL(pai_buf,PAI_FLAG_OFFSET,(pai_protected ? PAI_ACL_FLAG_PROTECTED : 0));
181 SSVAL(pai_buf,PAI_NUM_ENTRIES_OFFSET,num_entries);
182 SSVAL(pai_buf,PAI_NUM_DEFAULT_ENTRIES_OFFSET,num_def_entries);
183
184 entry_offset = pai_buf + PAI_ENTRIES_BASE;
185
186 for (ace_list = file_ace_list; ace_list; ace_list = ace_list->next) {
187 if (ace_list->inherited) {
188 uint8 type_val = (unsigned char)ace_list->owner_type;
189 uint32 entry_val = get_entry_val(ace_list);
190
191 SCVAL(entry_offset,0,type_val);
192 SIVAL(entry_offset,1,entry_val);
193 entry_offset += PAI_ENTRY_LENGTH;
194 }
195 }
196
197 for (ace_list = dir_ace_list; ace_list; ace_list = ace_list->next) {
198 if (ace_list->inherited) {
199 uint8 type_val = (unsigned char)ace_list->owner_type;
200 uint32 entry_val = get_entry_val(ace_list);
201
202 SCVAL(entry_offset,0,type_val);
203 SIVAL(entry_offset,1,entry_val);
204 entry_offset += PAI_ENTRY_LENGTH;
205 }
206 }
207
208 return pai_buf;
209 }
210
211 /************************************************************************
212 Store the user.SAMBA_PAI attribute on disk.
213 ************************************************************************/
214
215 static void store_inheritance_attributes(files_struct *fsp, canon_ace *file_ace_list,
216 canon_ace *dir_ace_list, BOOL pai_protected)
217 {
218 int ret;
219 size_t store_size;
220 char *pai_buf;
221
222 if (!lp_map_acl_inherit(SNUM(fsp->conn)))
223 return;
224
225 /*
226 * Don't store if this ACL isn't protected and
227 * none of the entries in it are marked as inherited.
228 */
229
230 if (!pai_protected && num_inherited_entries(file_ace_list) == 0 && num_inherited_entries(dir_ace_list) == 0) {
231 /* Instead just remove the attribute if it exists. */
232 if (fsp->fh->fd != -1)
233 SMB_VFS_FREMOVEXATTR(fsp, fsp->fh->fd, SAMBA_POSIX_INHERITANCE_EA_NAME);
234 else
235 SMB_VFS_REMOVEXATTR(fsp->conn, fsp->fsp_name, SAMBA_POSIX_INHERITANCE_EA_NAME);
236 return;
237 }
238
239 pai_buf = create_pai_buf(file_ace_list, dir_ace_list, pai_protected, &store_size);
240
241 if (fsp->fh->fd != -1)
242 ret = SMB_VFS_FSETXATTR(fsp, fsp->fh->fd, SAMBA_POSIX_INHERITANCE_EA_NAME,
243 pai_buf, store_size, 0);
244 else
245 ret = SMB_VFS_SETXATTR(fsp->conn,fsp->fsp_name, SAMBA_POSIX_INHERITANCE_EA_NAME,
246 pai_buf, store_size, 0);
247
248 SAFE_FREE(pai_buf);
249
250 DEBUG(10,("store_inheritance_attribute:%s for file %s\n", pai_protected ? " (protected)" : "", fsp->fsp_name));
251 if (ret == -1 && !no_acl_syscall_error(errno))
252 DEBUG(1,("store_inheritance_attribute: Error %s\n", strerror(errno) ));
253 }
254
255 /************************************************************************
256 Delete the in memory inheritance info.
257 ************************************************************************/
258
259 static void free_inherited_info(struct pai_val *pal)
260 {
261 if (pal) {
262 struct pai_entry *paie, *paie_next;
263 for (paie = pal->entry_list; paie; paie = paie_next) {
264 paie_next = paie->next;
265 SAFE_FREE(paie);
266 }
267 for (paie = pal->def_entry_list; paie; paie = paie_next) {
268 paie_next = paie->next;
269 SAFE_FREE(paie);
270 }
271 SAFE_FREE(pal);
272 }
273 }
274
275 /************************************************************************
276 Was this ACL protected ?
277 ************************************************************************/
278
279 static BOOL get_protected_flag(struct pai_val *pal)
280 {
281 if (!pal)
282 return False;
283 return pal->pai_protected;
284 }
285
286 /************************************************************************
287 Was this ACE inherited ?
288 ************************************************************************/
289
290 static BOOL get_inherited_flag(struct pai_val *pal, canon_ace *ace_entry, BOOL default_ace)
291 {
292 struct pai_entry *paie;
293
294 if (!pal)
295 return False;
296
297 /* If the entry exists it is inherited. */
298 for (paie = (default_ace ? pal->def_entry_list : pal->entry_list); paie; paie = paie->next) {
299 if (ace_entry->owner_type == paie->owner_type &&
300 get_entry_val(ace_entry) == get_pai_entry_val(paie))
301 return True;
302 }
303 return False;
304 }
305
306 /************************************************************************
307 Ensure an attribute just read is valid.
308 ************************************************************************/
309
310 static BOOL check_pai_ok(char *pai_buf, size_t pai_buf_data_size)
311 {
312 uint16 num_entries;
313 uint16 num_def_entries;
314
315 if (pai_buf_data_size < PAI_ENTRIES_BASE) {
316 /* Corrupted - too small. */
317 return False;
318 }
319
320 if (CVAL(pai_buf,PAI_VERSION_OFFSET) != PAI_VERSION)
321 return False;
322
323 num_entries = SVAL(pai_buf,PAI_NUM_ENTRIES_OFFSET);
324 num_def_entries = SVAL(pai_buf,PAI_NUM_DEFAULT_ENTRIES_OFFSET);
325
326 /* Check the entry lists match. */
327 /* Each entry is 5 bytes (type plus 4 bytes of uid or gid). */
328
329 if (((num_entries + num_def_entries)*PAI_ENTRY_LENGTH) + PAI_ENTRIES_BASE != pai_buf_data_size)
330 return False;
331
332 return True;
333 }
334
335
336 /************************************************************************
337 Convert to in-memory format.
338 ************************************************************************/
339
340 static struct pai_val *create_pai_val(char *buf, size_t size)
341 {
342 char *entry_offset;
343 struct pai_val *paiv = NULL;
344 int i;
345
346 if (!check_pai_ok(buf, size))
347 return NULL;
348
349 paiv = SMB_MALLOC_P(struct pai_val);
350 if (!paiv)
351 return NULL;
352
353 memset(paiv, '\0', sizeof(struct pai_val));
354
355 paiv->pai_protected = (CVAL(buf,PAI_FLAG_OFFSET) == PAI_ACL_FLAG_PROTECTED);
356
357 paiv->num_entries = SVAL(buf,PAI_NUM_ENTRIES_OFFSET);
358 paiv->num_def_entries = SVAL(buf,PAI_NUM_DEFAULT_ENTRIES_OFFSET);
359
360 entry_offset = buf + PAI_ENTRIES_BASE;
361
362 DEBUG(10,("create_pai_val:%s num_entries = %u, num_def_entries = %u\n",
363 paiv->pai_protected ? " (pai_protected)" : "", paiv->num_entries, paiv->num_def_entries ));
364
365 for (i = 0; i < paiv->num_entries; i++) {
366 struct pai_entry *paie;
367
368 paie = SMB_MALLOC_P(struct pai_entry);
369 if (!paie) {
370 free_inherited_info(paiv);
371 return NULL;
372 }
373
374 paie->owner_type = (enum ace_owner)CVAL(entry_offset,0);
375 switch( paie->owner_type) {
376 case UID_ACE:
377 paie->unix_ug.uid = (uid_t)IVAL(entry_offset,1);
378 DEBUG(10,("create_pai_val: uid = %u\n", (unsigned int)paie->unix_ug.uid ));
379 break;
380 case GID_ACE:
381 paie->unix_ug.gid = (gid_t)IVAL(entry_offset,1);
382 DEBUG(10,("create_pai_val: gid = %u\n", (unsigned int)paie->unix_ug.gid ));
383 break;
384 case WORLD_ACE:
385 paie->unix_ug.world = -1;
386 DEBUG(10,("create_pai_val: world ace\n"));
387 break;
388 default:
389 free_inherited_info(paiv);
390 return NULL;
391 }
392 entry_offset += PAI_ENTRY_LENGTH;
393 DLIST_ADD(paiv->entry_list, paie);
394 }
395
396 for (i = 0; i < paiv->num_def_entries; i++) {
397 struct pai_entry *paie;
398
399 paie = SMB_MALLOC_P(struct pai_entry);
400 if (!paie) {
401 free_inherited_info(paiv);
402 return NULL;
403 }
404
405 paie->owner_type = (enum ace_owner)CVAL(entry_offset,0);
406 switch( paie->owner_type) {
407 case UID_ACE:
408 paie->unix_ug.uid = (uid_t)IVAL(entry_offset,1);
409 DEBUG(10,("create_pai_val: (def) uid = %u\n", (unsigned int)paie->unix_ug.uid ));
410 break;
411 case GID_ACE:
412 paie->unix_ug.gid = (gid_t)IVAL(entry_offset,1);
413 DEBUG(10,("create_pai_val: (def) gid = %u\n", (unsigned int)paie->unix_ug.gid ));
414 break;
415 case WORLD_ACE:
416 paie->unix_ug.world = -1;
417 DEBUG(10,("create_pai_val: (def) world ace\n"));
418 break;
419 default:
420 free_inherited_info(paiv);
421 return NULL;
422 }
423 entry_offset += PAI_ENTRY_LENGTH;
424 DLIST_ADD(paiv->def_entry_list, paie);
425 }
426
427 return paiv;
428 }
429
430 /************************************************************************
431 Load the user.SAMBA_PAI attribute.
432 ************************************************************************/
433
434 static struct pai_val *load_inherited_info(files_struct *fsp)
435 {
436 char *pai_buf;
437 size_t pai_buf_size = 1024;
438 struct pai_val *paiv = NULL;
439 ssize_t ret;
440
441 if (!lp_map_acl_inherit(SNUM(fsp->conn)))
442 return NULL;
443
444 if ((pai_buf = (char *)SMB_MALLOC(pai_buf_size)) == NULL)
445 return NULL;
446
447 do {
448 if (fsp->fh->fd != -1)
449 ret = SMB_VFS_FGETXATTR(fsp, fsp->fh->fd, SAMBA_POSIX_INHERITANCE_EA_NAME,
450 pai_buf, pai_buf_size);
451 else
452 ret = SMB_VFS_GETXATTR(fsp->conn,fsp->fsp_name,SAMBA_POSIX_INHERITANCE_EA_NAME,
453 pai_buf, pai_buf_size);
454
455 if (ret == -1) {
456 if (errno != ERANGE) {
457 break;
458 }
459 /* Buffer too small - enlarge it. */
460 pai_buf_size *= 2;
461 SAFE_FREE(pai_buf);
462 if (pai_buf_size > 1024*1024) {
463 return NULL; /* Limit malloc to 1mb. */
464 }
465 if ((pai_buf = (char *)SMB_MALLOC(pai_buf_size)) == NULL)
466 return NULL;
467 }
468 } while (ret == -1);
469
470 DEBUG(10,("load_inherited_info: ret = %lu for file %s\n", (unsigned long)ret, fsp->fsp_name));
471
472 if (ret == -1) {
473 /* No attribute or not supported. */
474 #if defined(ENOATTR)
475 if (errno != ENOATTR)
476 DEBUG(10,("load_inherited_info: Error %s\n", strerror(errno) ));
477 #else
478 if (errno != ENOSYS)
479 DEBUG(10,("load_inherited_info: Error %s\n", strerror(errno) ));
480 #endif
481 SAFE_FREE(pai_buf);
482 return NULL;
483 }
484
485 paiv = create_pai_val(pai_buf, ret);
486
487 if (paiv && paiv->pai_protected)
488 DEBUG(10,("load_inherited_info: ACL is protected for file %s\n", fsp->fsp_name));
489
490 SAFE_FREE(pai_buf);
491 return paiv;
492 }
493
494 /****************************************************************************
495 Functions to manipulate the internal ACE format.
496 ****************************************************************************/
497
498 /****************************************************************************
499 Count a linked list of canonical ACE entries.
500 ****************************************************************************/
501
502 static size_t count_canon_ace_list( canon_ace *list_head )
503 {
504 size_t count = 0;
505 canon_ace *ace;
506
507 for (ace = list_head; ace; ace = ace->next)
508 count++;
509
510 return count;
511 }
512
513 /****************************************************************************
514 Free a linked list of canonical ACE entries.
515 ****************************************************************************/
516
517 static void free_canon_ace_list( canon_ace *list_head )
518 {
519 canon_ace *list, *next;
520
521 for (list = list_head; list; list = next) {
522 next = list->next;
523 DLIST_REMOVE(list_head, list);
524 SAFE_FREE(list);
525 }
526 }
527
528 /****************************************************************************
529 Function to duplicate a canon_ace entry.
530 ****************************************************************************/
531
532 static canon_ace *dup_canon_ace( canon_ace *src_ace)
533 {
534 canon_ace *dst_ace = SMB_MALLOC_P(canon_ace);
535
536 if (dst_ace == NULL)
537 return NULL;
538
539 *dst_ace = *src_ace;
540 dst_ace->prev = dst_ace->next = NULL;
541 return dst_ace;
542 }
543
544 /****************************************************************************
545 Print out a canon ace.
546 ****************************************************************************/
547
548 static void print_canon_ace(canon_ace *pace, int num)
549 {
550 fstring str;
551
552 dbgtext( "canon_ace index %d. Type = %s ", num, pace->attr == ALLOW_ACE ? "allow" : "deny" );
553 dbgtext( "SID = %s ", sid_to_string( str, &pace->trustee));
554 if (pace->owner_type == UID_ACE) {
555 const char *u_name = uidtoname(pace->unix_ug.uid);
556 dbgtext( "uid %u (%s) ", (unsigned int)pace->unix_ug.uid, u_name );
557 } else if (pace->owner_type == GID_ACE) {
558 char *g_name = gidtoname(pace->unix_ug.gid);
559 dbgtext( "gid %u (%s) ", (unsigned int)pace->unix_ug.gid, g_name );
560 } else
561 dbgtext( "other ");
562 switch (pace->type) {
563 case SMB_ACL_USER:
564 dbgtext( "SMB_ACL_USER ");
565 break;
566 case SMB_ACL_USER_OBJ:
567 dbgtext( "SMB_ACL_USER_OBJ ");
568 break;
569 case SMB_ACL_GROUP:
570 dbgtext( "SMB_ACL_GROUP ");
571 break;
572 case SMB_ACL_GROUP_OBJ:
573 dbgtext( "SMB_ACL_GROUP_OBJ ");
574 break;
575 case SMB_ACL_OTHER:
576 dbgtext( "SMB_ACL_OTHER ");
577 break;
578 default:
579 dbgtext( "MASK " );
580 break;
581 }
582 if (pace->inherited)
583 dbgtext( "(inherited) ");
584 dbgtext( "perms ");
585 dbgtext( "%c", pace->perms & S_IRUSR ? 'r' : '-');
586 dbgtext( "%c", pace->perms & S_IWUSR ? 'w' : '-');
587 dbgtext( "%c\n", pace->perms & S_IXUSR ? 'x' : '-');
588 }
589
590 /****************************************************************************
591 Print out a canon ace list.
592 ****************************************************************************/
593
594 static void print_canon_ace_list(const char *name, canon_ace *ace_list)
595 {
596 int count = 0;
597
598 if( DEBUGLVL( 10 )) {
599 dbgtext( "print_canon_ace_list: %s\n", name );
600 for (;ace_list; ace_list = ace_list->next, count++)
601 print_canon_ace(ace_list, count );
602 }
603 }
604
605 /****************************************************************************
606 Map POSIX ACL perms to canon_ace permissions (a mode_t containing only S_(R|W|X)USR bits).
607 ****************************************************************************/
608
609 static mode_t convert_permset_to_mode_t(connection_struct *conn, SMB_ACL_PERMSET_T permset)
610 {
611 mode_t ret = 0;
612
613 ret |= (SMB_VFS_SYS_ACL_GET_PERM(conn, permset, SMB_ACL_READ) ? S_IRUSR : 0);
614 ret |= (SMB_VFS_SYS_ACL_GET_PERM(conn, permset, SMB_ACL_WRITE) ? S_IWUSR : 0);
615 ret |= (SMB_VFS_SYS_ACL_GET_PERM(conn, permset, SMB_ACL_EXECUTE) ? S_IXUSR : 0);
616
617 return ret;
618 }
619
620 /****************************************************************************
621 Map generic UNIX permissions to canon_ace permissions (a mode_t containing only S_(R|W|X)USR bits).
622 ****************************************************************************/
623
624 static mode_t unix_perms_to_acl_perms(mode_t mode, int r_mask, int w_mask, int x_mask)
625 {
626 mode_t ret = 0;
627
628 if (mode & r_mask)
629 ret |= S_IRUSR;
630 if (mode & w_mask)
631 ret |= S_IWUSR;
632 if (mode & x_mask)
633 ret |= S_IXUSR;
634
635 return ret;
636 }
637
638 /****************************************************************************
639 Map canon_ace permissions (a mode_t containing only S_(R|W|X)USR bits) to
640 an SMB_ACL_PERMSET_T.
641 ****************************************************************************/
642
643 static int map_acl_perms_to_permset(connection_struct *conn, mode_t mode, SMB_ACL_PERMSET_T *p_permset)
644 {
645 if (SMB_VFS_SYS_ACL_CLEAR_PERMS(conn, *p_permset) == -1)
646 return -1;
647 if (mode & S_IRUSR) {
648 if (SMB_VFS_SYS_ACL_ADD_PERM(conn, *p_permset, SMB_ACL_READ) == -1)
649 return -1;
650 }
651 if (mode & S_IWUSR) {
652 if (SMB_VFS_SYS_ACL_ADD_PERM(conn, *p_permset, SMB_ACL_WRITE) == -1)
653 return -1;
654 }
655 if (mode & S_IXUSR) {
656 if (SMB_VFS_SYS_ACL_ADD_PERM(conn, *p_permset, SMB_ACL_EXECUTE) == -1)
657 return -1;
658 }
659 return 0;
660 }
661
662 /****************************************************************************
663 Function to create owner and group SIDs from a SMB_STRUCT_STAT.
664 ****************************************************************************/
665
666 static void create_file_sids(SMB_STRUCT_STAT *psbuf, DOM_SID *powner_sid, DOM_SID *pgroup_sid)
667 {
668 uid_to_sid( powner_sid, psbuf->st_uid );
669 gid_to_sid( pgroup_sid, psbuf->st_gid );
670 }
671
672 /****************************************************************************
673 Is the identity in two ACEs equal ? Check both SID and uid/gid.
674 ****************************************************************************/
675
676 static BOOL identity_in_ace_equal(canon_ace *ace1, canon_ace *ace2)
677 {
678 if (sid_equal(&ace1->trustee, &ace2->trustee)) {
679 return True;
680 }
681 if (ace1->owner_type == ace2->owner_type) {
682 if (ace1->owner_type == UID_ACE &&
683 ace1->unix_ug.uid == ace2->unix_ug.uid) {
684 return True;
685 } else if (ace1->owner_type == GID_ACE &&
686 ace1->unix_ug.gid == ace2->unix_ug.gid) {
687 return True;
688 }
689 }
690 return False;
691 }
692
693 /****************************************************************************
694 Merge aces with a common sid - if both are allow or deny, OR the permissions together and
695 delete the second one. If the first is deny, mask the permissions off and delete the allow
696 if the permissions become zero, delete the deny if the permissions are non zero.
697 ****************************************************************************/
698
699 static void merge_aces( canon_ace **pp_list_head )
700 {
701 canon_ace *list_head = *pp_list_head;
702 canon_ace *curr_ace_outer;
703 canon_ace *curr_ace_outer_next;
704
705 /*
706 * First, merge allow entries with identical SIDs, and deny entries
707 * with identical SIDs.
708 */
709
710 for (curr_ace_outer = list_head; curr_ace_outer; curr_ace_outer = curr_ace_outer_next) {
711 canon_ace *curr_ace;
712 canon_ace *curr_ace_next;
713
714 curr_ace_outer_next = curr_ace_outer->next; /* Save the link in case we delete. */
715
716 for (curr_ace = curr_ace_outer->next; curr_ace; curr_ace = curr_ace_next) {
717
718 curr_ace_next = curr_ace->next; /* Save the link in case of delete. */
719
720 if (identity_in_ace_equal(curr_ace, curr_ace_outer) &&
721 (curr_ace->attr == curr_ace_outer->attr)) {
722
723 if( DEBUGLVL( 10 )) {
724 dbgtext("merge_aces: Merging ACE's\n");
725 print_canon_ace( curr_ace_outer, 0);
726 print_canon_ace( curr_ace, 0);
727 }
728
729 /* Merge two allow or two deny ACE's. */
730
731 curr_ace_outer->perms |= curr_ace->perms;
732 DLIST_REMOVE(list_head, curr_ace);
733 SAFE_FREE(curr_ace);
734 curr_ace_outer_next = curr_ace_outer->next; /* We may have deleted the link. */
735 }
736 }
737 }
738
739 /*
740 * Now go through and mask off allow permissions with deny permissions.
741 * We can delete either the allow or deny here as we know that each SID
742 * appears only once in the list.
743 */
744
745 for (curr_ace_outer = list_head; curr_ace_outer; curr_ace_outer = curr_ace_outer_next) {
746 canon_ace *curr_ace;
747 canon_ace *curr_ace_next;
748
749 curr_ace_outer_next = curr_ace_outer->next; /* Save the link in case we delete. */
750
751 for (curr_ace = curr_ace_outer->next; curr_ace; curr_ace = curr_ace_next) {
752
753 curr_ace_next = curr_ace->next; /* Save the link in case of delete. */
754
755 /*
756 * Subtract ACE's with different entries. Due to the ordering constraints
757 * we've put on the ACL, we know the deny must be the first one.
758 */
759
760 if (identity_in_ace_equal(curr_ace, curr_ace_outer) &&
761 (curr_ace_outer->attr == DENY_ACE) && (curr_ace->attr == ALLOW_ACE)) {
762
763 if( DEBUGLVL( 10 )) {
764 dbgtext("merge_aces: Masking ACE's\n");
765 print_canon_ace( curr_ace_outer, 0);
766 print_canon_ace( curr_ace, 0);
767 }
768
769 curr_ace->perms &= ~curr_ace_outer->perms;
770
771 if (curr_ace->perms == 0) {
772
773 /*
774 * The deny overrides the allow. Remove the allow.
775 */
776
777 DLIST_REMOVE(list_head, curr_ace);
778 SAFE_FREE(curr_ace);
779 curr_ace_outer_next = curr_ace_outer->next; /* We may have deleted the link. */
780
781 } else {
782
783 /*
784 * Even after removing permissions, there
785 * are still allow permissions - delete the deny.
786 * It is safe to delete the deny here,
787 * as we are guarenteed by the deny first
788 * ordering that all the deny entries for
789 * this SID have already been merged into one
790 * before we can get to an allow ace.
791 */
792
793 DLIST_REMOVE(list_head, curr_ace_outer);
794 SAFE_FREE(curr_ace_outer);
795 break;
796 }
797 }
798
799 } /* end for curr_ace */
800 } /* end for curr_ace_outer */
801
802 /* We may have modified the list. */
803
804 *pp_list_head = list_head;
805 }
806
807 /****************************************************************************
808 Check if we need to return NT4.x compatible ACL entries.
809 ****************************************************************************/
810
811 static BOOL nt4_compatible_acls(void)
812 {
813 int compat = lp_acl_compatibility();
814
815 if (compat == ACL_COMPAT_AUTO) {
816 enum remote_arch_types ra_type = get_remote_arch();
817
818 /* Automatically adapt to client */
819 return (ra_type <= RA_WINNT);
820 } else
821 return (compat == ACL_COMPAT_WINNT);
822 }
823
824
825 /****************************************************************************
826 Map canon_ace perms to permission bits NT.
827 The attr element is not used here - we only process deny entries on set,
828 not get. Deny entries are implicit on get with ace->perms = 0.
829 ****************************************************************************/
830
831 static SEC_ACCESS map_canon_ace_perms(int snum,
832 int *pacl_type,
833 mode_t perms,
834 BOOL directory_ace)
835 {
836 SEC_ACCESS sa;
837 uint32 nt_mask = 0;
838
839 *pacl_type = SEC_ACE_TYPE_ACCESS_ALLOWED;
840
841 if (lp_acl_map_full_control(snum) && ((perms & ALL_ACE_PERMS) == ALL_ACE_PERMS)) {
842 if (directory_ace) {
843 nt_mask = UNIX_DIRECTORY_ACCESS_RWX;
844 } else {
845 nt_mask = UNIX_ACCESS_RWX;
846 }
847 } else if ((perms & ALL_ACE_PERMS) == (mode_t)0) {
848 /*
849 * Windows NT refuses to display ACEs with no permissions in them (but
850 * they are perfectly legal with Windows 2000). If the ACE has empty
851 * permissions we cannot use 0, so we use the otherwise unused
852 * WRITE_OWNER permission, which we ignore when we set an ACL.
853 * We abstract this into a #define of UNIX_ACCESS_NONE to allow this
854 * to be changed in the future.
855 */
856
857 if (nt4_compatible_acls())
858 nt_mask = UNIX_ACCESS_NONE;
859 else
860 nt_mask = 0;
861 } else {
862 if (directory_ace) {
863 nt_mask |= ((perms & S_IRUSR) ? UNIX_DIRECTORY_ACCESS_R : 0 );
864 nt_mask |= ((perms & S_IWUSR) ? UNIX_DIRECTORY_ACCESS_W : 0 );
865 nt_mask |= ((perms & S_IXUSR) ? UNIX_DIRECTORY_ACCESS_X : 0 );
866 } else {
867 nt_mask |= ((perms & S_IRUSR) ? UNIX_ACCESS_R : 0 );
868 nt_mask |= ((perms & S_IWUSR) ? UNIX_ACCESS_W : 0 );
869 nt_mask |= ((perms & S_IXUSR) ? UNIX_ACCESS_X : 0 );
870 }
871 }
872
873 DEBUG(10,("map_canon_ace_perms: Mapped (UNIX) %x to (NT) %x\n",
874 (unsigned int)perms, (unsigned int)nt_mask ));
875
876 init_sec_access(&sa,nt_mask);
877 return sa;
878 }
879
880 /****************************************************************************
881 Map NT perms to a UNIX mode_t.
882 ****************************************************************************/
883
884 #define FILE_SPECIFIC_READ_BITS (FILE_READ_DATA|FILE_READ_EA|FILE_READ_ATTRIBUTES)
885 #define FILE_SPECIFIC_WRITE_BITS (FILE_WRITE_DATA|FILE_APPEND_DATA|FILE_WRITE_EA|FILE_WRITE_ATTRIBUTES)
886 #define FILE_SPECIFIC_EXECUTE_BITS (FILE_EXECUTE)
887
888 static mode_t map_nt_perms( uint32 *mask, int type)
889 {
890 mode_t mode = 0;
891
892 switch(type) {
893 case S_IRUSR:
894 if((*mask) & GENERIC_ALL_ACCESS)
895 mode = S_IRUSR|S_IWUSR|S_IXUSR;
896 else {
897 mode |= ((*mask) & (GENERIC_READ_ACCESS|FILE_SPECIFIC_READ_BITS)) ? S_IRUSR : 0;
898 mode |= ((*mask) & (GENERIC_WRITE_ACCESS|FILE_SPECIFIC_WRITE_BITS)) ? S_IWUSR : 0;
899 mode |= ((*mask) & (GENERIC_EXECUTE_ACCESS|FILE_SPECIFIC_EXECUTE_BITS)) ? S_IXUSR : 0;
900 }
901 break;
902 case S_IRGRP:
903 if((*mask) & GENERIC_ALL_ACCESS)
904 mode = S_IRGRP|S_IWGRP|S_IXGRP;
905 else {
906 mode |= ((*mask) & (GENERIC_READ_ACCESS|FILE_SPECIFIC_READ_BITS)) ? S_IRGRP : 0;
907 mode |= ((*mask) & (GENERIC_WRITE_ACCESS|FILE_SPECIFIC_WRITE_BITS)) ? S_IWGRP : 0;
908 mode |= ((*mask) & (GENERIC_EXECUTE_ACCESS|FILE_SPECIFIC_EXECUTE_BITS)) ? S_IXGRP : 0;
909 }
910 break;
911 case S_IROTH:
912 if((*mask) & GENERIC_ALL_ACCESS)
913 mode = S_IROTH|S_IWOTH|S_IXOTH;
914 else {
915 mode |= ((*mask) & (GENERIC_READ_ACCESS|FILE_SPECIFIC_READ_BITS)) ? S_IROTH : 0;
916 mode |= ((*mask) & (GENERIC_WRITE_ACCESS|FILE_SPECIFIC_WRITE_BITS)) ? S_IWOTH : 0;
917 mode |= ((*mask) & (GENERIC_EXECUTE_ACCESS|FILE_SPECIFIC_EXECUTE_BITS)) ? S_IXOTH : 0;
918 }
919 break;
920 }
921
922 return mode;
923 }
924
925 /****************************************************************************
926 Unpack a SEC_DESC into a UNIX owner and group.
927 ****************************************************************************/
928
929 BOOL unpack_nt_owners(int snum, uid_t *puser, gid_t *pgrp, uint32 security_info_sent, SEC_DESC *psd)
930 {
931 DOM_SID owner_sid;
932 DOM_SID grp_sid;
933
934 *puser = (uid_t)-1;
935 *pgrp = (gid_t)-1;
936
937 if(security_info_sent == 0) {
938 DEBUG(0,("unpack_nt_owners: no security info sent !\n"));
939 return True;
940 }
941
942 /*
943 * Validate the owner and group SID's.
944 */
945
946 memset(&owner_sid, '\0', sizeof(owner_sid));
947 memset(&grp_sid, '\0', sizeof(grp_sid));
948
949 DEBUG(5,("unpack_nt_owners: validating owner_sids.\n"));
950
951 /*
952 * Don't immediately fail if the owner sid cannot be validated.
953 * This may be a group chown only set.
954 */
955
956 if (security_info_sent & OWNER_SECURITY_INFORMATION) {
957 sid_copy(&owner_sid, psd->owner_sid);
958 if (!sid_to_uid(&owner_sid, puser)) {
959 if (lp_force_unknown_acl_user(snum)) {
960 /* this allows take ownership to work
961 * reasonably */
962 *puser = current_user.ut.uid;
963 } else {
964 DEBUG(3,("unpack_nt_owners: unable to validate"
965 " owner sid for %s\n",
966 sid_string_static(&owner_sid)));
967 return False;
968 }
969 }
970 }
971
972 /*
973 * Don't immediately fail if the group sid cannot be validated.
974 * This may be an owner chown only set.
975 */
976
977 if (security_info_sent & GROUP_SECURITY_INFORMATION) {
978 sid_copy(&grp_sid, psd->group_sid);
979 if (!sid_to_gid( &grp_sid, pgrp)) {
980 if (lp_force_unknown_acl_user(snum)) {
981 /* this allows take group ownership to work
982 * reasonably */
983 *pgrp = current_user.ut.gid;
984 } else {
985 DEBUG(3,("unpack_nt_owners: unable to validate"
986 " group sid.\n"));
987 return False;
988 }
989 }
990 }
991
992 DEBUG(5,("unpack_nt_owners: owner_sids validated.\n"));
993
994 return True;
995 }
996
997 /****************************************************************************
998 Ensure the enforced permissions for this share apply.
999 ****************************************************************************/
1000
1001 static void apply_default_perms(files_struct *fsp, canon_ace *pace, mode_t type)
1002 {
1003 int snum = SNUM(fsp->conn);
1004 mode_t and_bits = (mode_t)0;
1005 mode_t or_bits = (mode_t)0;
1006
1007 /* Get the initial bits to apply. */
1008
1009 if (fsp->is_directory) {
1010 and_bits = lp_dir_security_mask(snum);
1011 or_bits = lp_force_dir_security_mode(snum);
1012 } else {
1013 and_bits = lp_security_mask(snum);
1014 or_bits = lp_force_security_mode(snum);
1015 }
1016
1017 /* Now bounce them into the S_USR space. */
1018 switch(type) {
1019 case S_IRUSR:
1020 /* Ensure owner has read access. */
1021 pace->perms |= S_IRUSR;
1022 if (fsp->is_directory)
1023 pace->perms |= (S_IWUSR|S_IXUSR);
1024 and_bits = unix_perms_to_acl_perms(and_bits, S_IRUSR, S_IWUSR, S_IXUSR);
1025 or_bits = unix_perms_to_acl_perms(or_bits, S_IRUSR, S_IWUSR, S_IXUSR);
1026 break;
1027 case S_IRGRP:
1028 and_bits = unix_perms_to_acl_perms(and_bits, S_IRGRP, S_IWGRP, S_IXGRP);
1029 or_bits = unix_perms_to_acl_perms(or_bits, S_IRGRP, S_IWGRP, S_IXGRP);
1030 break;
1031 case S_IROTH:
1032 and_bits = unix_perms_to_acl_perms(and_bits, S_IROTH, S_IWOTH, S_IXOTH);
1033 or_bits = unix_perms_to_acl_perms(or_bits, S_IROTH, S_IWOTH, S_IXOTH);
1034 break;
1035 }
1036
1037 pace->perms = ((pace->perms & and_bits)|or_bits);
1038 }
1039
1040 /****************************************************************************
1041 Check if a given uid/SID is in a group gid/SID. This is probably very
1042 expensive and will need optimisation. A *lot* of optimisation :-). JRA.
1043 ****************************************************************************/
1044
1045 static BOOL uid_entry_in_group( canon_ace *uid_ace, canon_ace *group_ace )
1046 {
1047 fstring u_name;
1048
1049 /* "Everyone" always matches every uid. */
1050
1051 if (sid_equal(&group_ace->trustee, &global_sid_World))
1052 return True;
1053
1054 /* Assume that the current user is in the current group (force group) */
1055
1056 if (uid_ace->unix_ug.uid == current_user.ut.uid && group_ace->unix_ug.gid == current_user.ut.gid)
1057 return True;
1058
1059 fstrcpy(u_name, uidtoname(uid_ace->unix_ug.uid));
1060 return user_in_group_sid(u_name, &group_ace->trustee);
1061 }
1062
1063 /****************************************************************************
1064 A well formed POSIX file or default ACL has at least 3 entries, a
1065 SMB_ACL_USER_OBJ, SMB_ACL_GROUP_OBJ, SMB_ACL_OTHER_OBJ.
1066 In addition, the owner must always have at least read access.
1067 When using this call on get_acl, the pst struct is valid and contains
1068 the mode of the file. When using this call on set_acl, the pst struct has
1069 been modified to have a mode containing the default for this file or directory
1070 type.
1071 ****************************************************************************/
1072
1073 static BOOL ensure_canon_entry_valid(canon_ace **pp_ace,
1074 files_struct *fsp,
1075 const DOM_SID *pfile_owner_sid,
1076 const DOM_SID *pfile_grp_sid,
1077 SMB_STRUCT_STAT *pst,
1078 BOOL setting_acl)
1079 {
1080 canon_ace *pace;
1081 BOOL got_user = False;
1082 BOOL got_grp = False;
1083 BOOL got_other = False;
1084 canon_ace *pace_other = NULL;
1085
1086 for (pace = *pp_ace; pace; pace = pace->next) {
1087 if (pace->type == SMB_ACL_USER_OBJ) {
1088
1089 if (setting_acl)
1090 apply_default_perms(fsp, pace, S_IRUSR);
1091 got_user = True;
1092
1093 } else if (pace->type == SMB_ACL_GROUP_OBJ) {
1094
1095 /*
1096 * Ensure create mask/force create mode is respected on set.
1097 */
1098
1099 if (setting_acl)
1100 apply_default_perms(fsp, pace, S_IRGRP);
1101 got_grp = True;
1102
1103 } else if (pace->type == SMB_ACL_OTHER) {
1104
1105 /*
1106 * Ensure create mask/force create mode is respected on set.
1107 */
1108
1109 if (setting_acl)
1110 apply_default_perms(fsp, pace, S_IROTH);
1111 got_other = True;
1112 pace_other = pace;
1113 }
1114 }
1115
1116 if (!got_user) {
1117 if ((pace = SMB_MALLOC_P(canon_ace)) == NULL) {
1118 DEBUG(0,("ensure_canon_entry_valid: malloc fail.\n"));
1119 return False;
1120 }
1121
1122 ZERO_STRUCTP(pace);
1123 pace->type = SMB_ACL_USER_OBJ;
1124 pace->owner_type = UID_ACE;
1125 pace->unix_ug.uid = pst->st_uid;
1126 pace->trustee = *pfile_owner_sid;
1127 pace->attr = ALLOW_ACE;
1128
1129 if (setting_acl) {
1130 /* See if the owning user is in any of the other groups in
1131 the ACE. If so, OR in the permissions from that group. */
1132
1133 BOOL group_matched = False;
1134 canon_ace *pace_iter;
1135
1136 for (pace_iter = *pp_ace; pace_iter; pace_iter = pace_iter->next) {
1137 if (pace_iter->type == SMB_ACL_GROUP_OBJ || pace_iter->type == SMB_ACL_GROUP) {
1138 if (uid_entry_in_group(pace, pace_iter)) {
1139 pace->perms |= pace_iter->perms;
1140 group_matched = True;
1141 }
1142 }
1143 }
1144
1145 /* If we only got an "everyone" perm, just use that. */
1146 if (!group_matched) {
1147 if (got_other)
1148 pace->perms = pace_other->perms;
1149 else
1150 pace->perms = 0;
1151 }
1152
1153 apply_default_perms(fsp, pace, S_IRUSR);
1154 } else {
1155 pace->perms = unix_perms_to_acl_perms(pst->st_mode, S_IRUSR, S_IWUSR, S_IXUSR);
1156 }
1157
1158 DLIST_ADD(*pp_ace, pace);
1159 }
1160
1161 if (!got_grp) {
1162 if ((pace = SMB_MALLOC_P(canon_ace)) == NULL) {
1163 DEBUG(0,("ensure_canon_entry_valid: malloc fail.\n"));
1164 return False;
1165 }
1166
1167 ZERO_STRUCTP(pace);
1168 pace->type = SMB_ACL_GROUP_OBJ;
1169 pace->owner_type = GID_ACE;
1170 pace->unix_ug.uid = pst->st_gid;
1171 pace->trustee = *pfile_grp_sid;
1172 pace->attr = ALLOW_ACE;
1173 if (setting_acl) {
1174 /* If we only got an "everyone" perm, just use that. */
1175 if (got_other)
1176 pace->perms = pace_other->perms;
1177 else
1178 pace->perms = 0;
1179 apply_default_perms(fsp, pace, S_IRGRP);
1180 } else {
1181 pace->perms = unix_perms_to_acl_perms(pst->st_mode, S_IRGRP, S_IWGRP, S_IXGRP);
1182 }
1183
1184 DLIST_ADD(*pp_ace, pace);
1185 }
1186
1187 if (!got_other) {
1188 if ((pace = SMB_MALLOC_P(canon_ace)) == NULL) {
1189 DEBUG(0,("ensure_canon_entry_valid: malloc fail.\n"));
1190 return False;
1191 }
1192
1193 ZERO_STRUCTP(pace);
1194 pace->type = SMB_ACL_OTHER;
1195 pace->owner_type = WORLD_ACE;
1196 pace->unix_ug.world = -1;
1197 pace->trustee = global_sid_World;
1198 pace->attr = ALLOW_ACE;
1199 if (setting_acl) {
1200 pace->perms = 0;
1201 apply_default_perms(fsp, pace, S_IROTH);
1202 } else
1203 pace->perms = unix_perms_to_acl_perms(pst->st_mode, S_IROTH, S_IWOTH, S_IXOTH);
1204
1205 DLIST_ADD(*pp_ace, pace);
1206 }
1207
1208 return True;
1209 }
1210
1211 /****************************************************************************
1212 Check if a POSIX ACL has the required SMB_ACL_USER_OBJ and SMB_ACL_GROUP_OBJ entries.
1213 If it does not have them, check if there are any entries where the trustee is the
1214 file owner or the owning group, and map these to SMB_ACL_USER_OBJ and SMB_ACL_GROUP_OBJ.
1215 ****************************************************************************/
1216
1217 static void check_owning_objs(canon_ace *ace, DOM_SID *pfile_owner_sid, DOM_SID *pfile_grp_sid)
1218 {
1219 BOOL got_user_obj, got_group_obj;
1220 canon_ace *current_ace;
1221 int i, entries;
1222
1223 entries = count_canon_ace_list(ace);
1224 got_user_obj = False;
1225 got_group_obj = False;
1226
1227 for (i=0, current_ace = ace; i < entries; i++, current_ace = current_ace->next) {
1228 if (current_ace->type == SMB_ACL_USER_OBJ)
1229 got_user_obj = True;
1230 else if (current_ace->type == SMB_ACL_GROUP_OBJ)
1231 got_group_obj = True;
1232 }
1233 if (got_user_obj && got_group_obj) {
1234 DEBUG(10,("check_owning_objs: ACL had owning user/group entries.\n"));
1235 return;
1236 }
1237
1238 for (i=0, current_ace = ace; i < entries; i++, current_ace = current_ace->next) {
1239 if (!got_user_obj && current_ace->owner_type == UID_ACE &&
1240 sid_equal(&current_ace->trustee, pfile_owner_sid)) {
1241 current_ace->type = SMB_ACL_USER_OBJ;
1242 got_user_obj = True;
1243 }
1244 if (!got_group_obj && current_ace->owner_type == GID_ACE &&
1245 sid_equal(&current_ace->trustee, pfile_grp_sid)) {
1246 current_ace->type = SMB_ACL_GROUP_OBJ;
1247 got_group_obj = True;
1248 }
1249 }
1250 if (!got_user_obj)
1251 DEBUG(10,("check_owning_objs: ACL is missing an owner entry.\n"));
1252 if (!got_group_obj)
1253 DEBUG(10,("check_owning_objs: ACL is missing an owning group entry.\n"));
1254 }
1255
1256 /****************************************************************************
1257 Unpack a SEC_DESC into two canonical ace lists.
1258 ****************************************************************************/
1259
1260 static BOOL create_canon_ace_lists(files_struct *fsp, SMB_STRUCT_STAT *pst,
1261 DOM_SID *pfile_owner_sid,
1262 DOM_SID *pfile_grp_sid,
1263 canon_ace **ppfile_ace, canon_ace **ppdir_ace,
1264 SEC_ACL *dacl)
1265 {
1266 BOOL all_aces_are_inherit_only = (fsp->is_directory ? True : False);
1267 canon_ace *file_ace = NULL;
1268 canon_ace *dir_ace = NULL;
1269 canon_ace *current_ace = NULL;
1270 BOOL got_dir_allow = False;
1271 BOOL got_file_allow = False;
1272 int i, j;
1273
1274 *ppfile_ace = NULL;
1275 *ppdir_ace = NULL;
1276
1277 /*
1278 * Convert the incoming ACL into a more regular form.
1279 */
1280
1281 for(i = 0; i < dacl->num_aces; i++) {
1282 SEC_ACE *psa = &dacl->aces[i];
1283
1284 if((psa->type != SEC_ACE_TYPE_ACCESS_ALLOWED) && (psa->type != SEC_ACE_TYPE_ACCESS_DENIED)) {
1285 DEBUG(3,("create_canon_ace_lists: unable to set anything but an ALLOW or DENY ACE.\n"));
1286 return False;
1287 }
1288
1289 if (nt4_compatible_acls()) {
1290 /*
1291 * The security mask may be UNIX_ACCESS_NONE which should map into
1292 * no permissions (we overload the WRITE_OWNER bit for this) or it
1293 * should be one of the ALL/EXECUTE/READ/WRITE bits. Arrange for this
1294 * to be so. Any other bits override the UNIX_ACCESS_NONE bit.
1295 */
1296
1297 /*
1298 * Convert GENERIC bits to specific bits.
1299 */
1300
1301 se_map_generic(&psa->access_mask, &file_generic_mapping);
1302
1303 psa->access_mask &= (UNIX_ACCESS_NONE|FILE_ALL_ACCESS);
1304
1305 if(psa->access_mask != UNIX_ACCESS_NONE)
1306 psa->access_mask &= ~UNIX_ACCESS_NONE;
1307 }
1308 }
1309
1310 /*
1311 * Deal with the fact that NT 4.x re-writes the canonical format
1312 * that we return for default ACLs. If a directory ACE is identical
1313 * to a inherited directory ACE then NT changes the bits so that the
1314 * first ACE is set to OI|IO and the second ACE for this SID is set
1315 * to CI. We need to repair this. JRA.
1316 */
1317
1318 for(i = 0; i < dacl->num_aces; i++) {
1319 SEC_ACE *psa1 = &dacl->aces[i];
1320
1321 for (j = i + 1; j < dacl->num_aces; j++) {
1322 SEC_ACE *psa2 = &dacl->aces[j];
1323
1324 if (psa1->access_mask != psa2->access_mask)
1325 continue;
1326
1327 if (!sid_equal(&psa1->trustee, &psa2->trustee))
1328 continue;
1329
1330 /*
1331 * Ok - permission bits and SIDs are equal.
1332 * Check if flags were re-written.
1333 */
1334
1335 if (psa1->flags & SEC_ACE_FLAG_INHERIT_ONLY) {
1336
1337 psa1->flags |= (psa2->flags & (SEC_ACE_FLAG_CONTAINER_INHERIT|SEC_ACE_FLAG_OBJECT_INHERIT));
1338 psa2->flags &= ~(SEC_ACE_FLAG_CONTAINER_INHERIT|SEC_ACE_FLAG_OBJECT_INHERIT);
1339
1340 } else if (psa2->flags & SEC_ACE_FLAG_INHERIT_ONLY) {
1341
1342 psa2->flags |= (psa1->flags & (SEC_ACE_FLAG_CONTAINER_INHERIT|SEC_ACE_FLAG_OBJECT_INHERIT));
1343 psa1->flags &= ~(SEC_ACE_FLAG_CONTAINER_INHERIT|SEC_ACE_FLAG_OBJECT_INHERIT);
1344
1345 }
1346 }
1347 }
1348
1349 for(i = 0; i < dacl->num_aces; i++) {
1350 SEC_ACE *psa = &dacl->aces[i];
1351
1352 /*
1353 * Create a cannon_ace entry representing this NT DACL ACE.
1354 */
1355
1356 if ((current_ace = SMB_MALLOC_P(canon_ace)) == NULL) {
1357 free_canon_ace_list(file_ace);
1358 free_canon_ace_list(dir_ace);
1359 DEBUG(0,("create_canon_ace_lists: malloc fail.\n"));
1360 return False;
1361 }
1362
1363 ZERO_STRUCTP(current_ace);
1364
1365 sid_copy(&current_ace->trustee, &psa->trustee);
1366
1367 /*
1368 * Try and work out if the SID is a user or group
1369 * as we need to flag these differently for POSIX.
1370 * Note what kind of a POSIX ACL this should map to.
1371 */
1372
1373 if( sid_equal(&current_ace->trustee, &global_sid_World)) {
1374 current_ace->owner_type = WORLD_ACE;
1375 current_ace->unix_ug.world = -1;
1376 current_ace->type = SMB_ACL_OTHER;
1377 } else if (sid_equal(&current_ace->trustee, &global_sid_Creator_Owner)) {
1378 current_ace->owner_type = UID_ACE;
1379 current_ace->unix_ug.uid = pst->st_uid;
1380 current_ace->type = SMB_ACL_USER_OBJ;
1381
1382 /*
1383 * The Creator Owner entry only specifies inheritable permissions,
1384 * never access permissions. WinNT doesn't always set the ACE to
1385 *INHERIT_ONLY, though.
1386 */
1387
1388 if (nt4_compatible_acls())
1389 psa->flags |= SEC_ACE_FLAG_INHERIT_ONLY;
1390 } else if (sid_equal(&current_ace->trustee, &global_sid_Creator_Group)) {
1391 current_ace->owner_type = GID_ACE;
1392 current_ace->unix_ug.gid = pst->st_gid;
1393 current_ace->type = SMB_ACL_GROUP_OBJ;
1394
1395 /*
1396 * The Creator Group entry only specifies inheritable permissions,
1397 * never access permissions. WinNT doesn't always set the ACE to
1398 *INHERIT_ONLY, though.
1399 */
1400 if (nt4_compatible_acls())
1401 psa->flags |= SEC_ACE_FLAG_INHERIT_ONLY;
1402
1403 } else if (sid_to_uid( &current_ace->trustee, &current_ace->unix_ug.uid)) {
1404 current_ace->owner_type = UID_ACE;
1405 /* If it's the owning user, this is a user_obj, not
1406 * a user. */
1407 if (current_ace->unix_ug.uid == pst->st_uid) {
1408 current_ace->type = SMB_ACL_USER_OBJ;
1409 } else {
1410 current_ace->type = SMB_ACL_USER;
1411 }
1412 } else if (sid_to_gid( &current_ace->trustee, &current_ace->unix_ug.gid)) {
1413 current_ace->owner_type = GID_ACE;
1414 /* If it's the primary group, this is a group_obj, not
1415 * a group. */
1416 if (current_ace->unix_ug.gid == pst->st_gid) {
1417 current_ace->type = SMB_ACL_GROUP_OBJ;
1418 } else {
1419 current_ace->type = SMB_ACL_GROUP;
1420 }
1421 } else {
1422 fstring str;
1423
1424 /*
1425 * Silently ignore map failures in non-mappable SIDs (NT Authority, BUILTIN etc).
1426 */
1427
1428 if (non_mappable_sid(&psa->trustee)) {
1429 DEBUG(10,("create_canon_ace_lists: ignoring non-mappable SID %s\n",
1430 sid_to_string(str, &psa->trustee) ));
1431 SAFE_FREE(current_ace);
1432 continue;
1433 }
1434
1435 free_canon_ace_list(file_ace);
1436 free_canon_ace_list(dir_ace);
1437 DEBUG(0,("create_canon_ace_lists: unable to map SID %s to uid or gid.\n",
1438 sid_to_string(str, &current_ace->trustee) ));
1439 SAFE_FREE(current_ace);
1440 return False;
1441 }
1442
1443 /*
1444 * Map the given NT permissions into a UNIX mode_t containing only
1445 * S_I(R|W|X)USR bits.
1446 */
1447
1448 current_ace->perms |= map_nt_perms( &psa->access_mask, S_IRUSR);
1449 current_ace->attr = (psa->type == SEC_ACE_TYPE_ACCESS_ALLOWED) ? ALLOW_ACE : DENY_ACE;
1450 current_ace->inherited = ((psa->flags & SEC_ACE_FLAG_INHERITED_ACE) ? True : False);
1451
1452 /*
1453 * Now add the created ace to either the file list, the directory
1454 * list, or both. We *MUST* preserve the order here (hence we use
1455 * DLIST_ADD_END) as NT ACLs are order dependent.
1456 */
1457
1458 if (fsp->is_directory) {
1459
1460 /*
1461 * We can only add to the default POSIX ACE list if the ACE is
1462 * designed to be inherited by both files and directories.
1463 */
1464
1465 if ((psa->flags & (SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT)) ==
1466 (SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT)) {
1467
1468 DLIST_ADD_END(dir_ace, current_ace, canon_ace *);
1469
1470 /*
1471 * Note if this was an allow ace. We can't process
1472 * any further deny ace's after this.
1473 */
1474
1475 if (current_ace->attr == ALLOW_ACE)
1476 got_dir_allow = True;
1477
1478 if ((current_ace->attr == DENY_ACE) && got_dir_allow) {
1479 DEBUG(0,("create_canon_ace_lists: malformed ACL in inheritable ACL ! \
1480 Deny entry after Allow entry. Failing to set on file %s.\n", fsp->fsp_name ));
1481 free_canon_ace_list(file_ace);
1482 free_canon_ace_list(dir_ace);
1483 return False;
1484 }
1485
1486 if( DEBUGLVL( 10 )) {
1487 dbgtext("create_canon_ace_lists: adding dir ACL:\n");
1488 print_canon_ace( current_ace, 0);
1489 }
1490
1491 /*
1492 * If this is not an inherit only ACE we need to add a duplicate
1493 * to the file acl.
1494 */
1495
1496 if (!(psa->flags & SEC_ACE_FLAG_INHERIT_ONLY)) {
1497 canon_ace *dup_ace = dup_canon_ace(current_ace);
1498
1499 if (!dup_ace) {
1500 DEBUG(0,("create_canon_ace_lists: malloc fail !\n"));
1501 free_canon_ace_list(file_ace);
1502 free_canon_ace_list(dir_ace);
1503 return False;
1504 }
1505
1506 /*
1507 * We must not free current_ace here as its
1508 * pointer is now owned by the dir_ace list.
1509 */
1510 current_ace = dup_ace;
1511 } else {
1512 /*
1513 * We must not free current_ace here as its
1514 * pointer is now owned by the dir_ace list.
1515 */
1516 current_ace = NULL;
1517 }
1518 }
1519 }
1520
1521 /*
1522 * Only add to the file ACL if not inherit only.
1523 */
1524
1525 if (current_ace && !(psa->flags & SEC_ACE_FLAG_INHERIT_ONLY)) {
1526 DLIST_ADD_END(file_ace, current_ace, canon_ace *);
1527
1528 /*
1529 * Note if this was an allow ace. We can't process
1530 * any further deny ace's after this.
1531 */
1532
1533 if (current_ace->attr == ALLOW_ACE)
1534 got_file_allow = True;
1535
1536 if ((current_ace->attr == DENY_ACE) && got_file_allow) {
1537 DEBUG(0,("create_canon_ace_lists: malformed ACL in file ACL ! \
1538 Deny entry after Allow entry. Failing to set on file %s.\n", fsp->fsp_name ));
1539 free_canon_ace_list(file_ace);
1540 free_canon_ace_list(dir_ace);
1541 return False;
1542 }
1543
1544 if( DEBUGLVL( 10 )) {
1545 dbgtext("create_canon_ace_lists: adding file ACL:\n");
1546 print_canon_ace( current_ace, 0);
1547 }
1548 all_aces_are_inherit_only = False;
1549 /*
1550 * We must not free current_ace here as its
1551 * pointer is now owned by the file_ace list.
1552 */
1553 current_ace = NULL;
1554 }
1555
1556 /*
1557 * Free if ACE was not added.
1558 */
1559
1560 SAFE_FREE(current_ace);
1561 }
1562
1563 if (fsp->is_directory && all_aces_are_inherit_only) {
1564 /*
1565 * Windows 2000 is doing one of these weird 'inherit acl'
1566 * traverses to conserve NTFS ACL resources. Just pretend
1567 * there was no DACL sent. JRA.
1568 */
1569
1570 DEBUG(10,("create_canon_ace_lists: Win2k inherit acl traverse. Ignoring DACL.\n"));
1571 free_canon_ace_list(file_ace);
1572 free_canon_ace_list(dir_ace);
1573 file_ace = NULL;
1574 dir_ace = NULL;
1575 } else {
1576 /*
1577 * Check if we have SMB_ACL_USER_OBJ and SMB_ACL_GROUP_OBJ entries in each
1578 * ACL. If we don't have them, check if any SMB_ACL_USER/SMB_ACL_GROUP
1579 * entries can be converted to *_OBJ. Usually we will already have these
1580 * entries in the Default ACL, and the Access ACL will not have them.
1581 */
1582 if (file_ace) {
1583 check_owning_objs(file_ace, pfile_owner_sid, pfile_grp_sid);
1584 }
1585 if (dir_ace) {
1586 check_owning_objs(dir_ace, pfile_owner_sid, pfile_grp_sid);
1587 }
1588 }
1589
1590 *ppfile_ace = file_ace;
1591 *ppdir_ace = dir_ace;
1592
1593 return True;
1594 }
1595
1596 /****************************************************************************
1597 ASCII art time again... JRA :-).
1598
1599 We have 4 cases to process when moving from an NT ACL to a POSIX ACL. Firstly,
1600 we insist the ACL is in canonical form (ie. all DENY entries preceede ALLOW
1601 entries). Secondly, the merge code has ensured that all duplicate SID entries for
1602 allow or deny have been merged, so the same SID can only appear once in the deny
1603 list or once in the allow list.
1604
1605 We then process as follows :
1606
1607 ---------------------------------------------------------------------------
1608 First pass - look for a Everyone DENY entry.
1609
1610 If it is deny all (rwx) trunate the list at this point.
1611 Else, walk the list from this point and use the deny permissions of this
1612 entry as a mask on all following allow entries. Finally, delete
1613 the Everyone DENY entry (we have applied it to everything possible).
1614
1615 In addition, in this pass we remove any DENY entries that have
1616 no permissions (ie. they are a DENY nothing).
1617 ---------------------------------------------------------------------------
1618 Second pass - only deal with deny user entries.
1619
1620 DENY user1 (perms XXX)
1621
1622 new_perms = 0
1623 for all following allow group entries where user1 is in group
1624 new_perms |= group_perms;
1625
1626 user1 entry perms = new_perms & ~ XXX;
1627
1628 Convert the deny entry to an allow entry with the new perms and
1629 push to the end of the list. Note if the user was in no groups
1630 this maps to a specific allow nothing entry for this user.
1631
1632 The common case from the NT ACL choser (userX deny all) is
1633 optimised so we don't do the group lookup - we just map to
1634 an allow nothing entry.
1635
1636 What we're doing here is inferring the allow permissions the
1637 person setting the ACE on user1 wanted by looking at the allow
1638 permissions on the groups the user is currently in. This will
1639 be a snapshot, depending on group membership but is the best
1640 we can do and has the advantage of failing closed rather than
1641 open.
1642 ---------------------------------------------------------------------------
1643 Third pass - only deal with deny group entries.
1644
1645 DENY group1 (perms XXX)
1646
1647 for all following allow user entries where user is in group1
1648 user entry perms = user entry perms & ~ XXX;
1649
1650 If there is a group Everyone allow entry with permissions YYY,
1651 convert the group1 entry to an allow entry and modify its
1652 permissions to be :
1653
1654 new_perms = YYY & ~ XXX
1655
1656 and push to the end of the list.
1657
1658 If there is no group Everyone allow entry then convert the
1659 group1 entry to a allow nothing entry and push to the end of the list.
1660
1661 Note that the common case from the NT ACL choser (groupX deny all)
1662 cannot be optimised here as we need to modify user entries who are
1663 in the group to change them to a deny all also.
1664
1665 What we're doing here is modifying the allow permissions of
1666 user entries (which are more specific in POSIX ACLs) to mask
1667 out the explicit deny set on the group they are in. This will
1668 be a snapshot depending on current group membership but is the
1669 best we can do and has the advantage of failing closed rather
1670 than open.
1671 ---------------------------------------------------------------------------
1672 Fourth pass - cope with cumulative permissions.
1673
1674 for all allow user entries, if there exists an allow group entry with
1675 more permissive permissions, and the user is in that group, rewrite the
1676 allow user permissions to contain both sets of permissions.
1677
1678 Currently the code for this is #ifdef'ed out as these semantics make
1679 no sense to me. JRA.
1680 ---------------------------------------------------------------------------
1681
1682 Note we *MUST* do the deny user pass first as this will convert deny user
1683 entries into allow user entries which can then be processed by the deny
1684 group pass.
1685
1686 The above algorithm took a *lot* of thinking about - hence this
1687 explaination :-). JRA.
1688 ****************************************************************************/
1689
1690 /****************************************************************************
1691 Process a canon_ace list entries. This is very complex code. We need
1692 to go through and remove the "deny" permissions from any allow entry that matches
1693 the id of this entry. We have already refused any NT ACL that wasn't in correct
1694 order (DENY followed by ALLOW). If any allow entry ends up with zero permissions,
1695 we just remove it (to fail safe). We have already removed any duplicate ace
1696 entries. Treat an "Everyone" DENY_ACE as a special case - use it to mask all
1697 allow entries.
1698 ****************************************************************************/
1699
1700 static void process_deny_list( canon_ace **pp_ace_list )
1701 {
1702 canon_ace *ace_list = *pp_ace_list;
1703 canon_ace *curr_ace = NULL;
1704 canon_ace *curr_ace_next = NULL;
1705
1706 /* Pass 1 above - look for an Everyone, deny entry. */
1707
1708 for (curr_ace = ace_list; curr_ace; curr_ace = curr_ace_next) {
1709 canon_ace *allow_ace_p;
1710
1711 curr_ace_next = curr_ace->next; /* So we can't lose the link. */
1712
1713 if (curr_ace->attr != DENY_ACE)
1714 continue;
1715
1716 if (curr_ace->perms == (mode_t)0) {
1717
1718 /* Deny nothing entry - delete. */
1719
1720 DLIST_REMOVE(ace_list, curr_ace);
1721 continue;
1722 }
1723
1724 if (!sid_equal(&curr_ace->trustee, &global_sid_World))
1725 continue;
1726
1727 /* JRATEST - assert. */
1728 SMB_ASSERT(curr_ace->owner_type == WORLD_ACE);
1729
1730 if (curr_ace->perms == ALL_ACE_PERMS) {
1731
1732 /*
1733 * Optimisation. This is a DENY_ALL to Everyone. Truncate the
1734 * list at this point including this entry.
1735 */
1736
1737 canon_ace *prev_entry = curr_ace->prev;
1738
1739 free_canon_ace_list( curr_ace );
1740 if (prev_entry)
1741 prev_entry->next = NULL;
1742 else {
1743 /* We deleted the entire list. */
1744 ace_list = NULL;
1745 }
1746 break;
1747 }
1748
1749 for (allow_ace_p = curr_ace->next; allow_ace_p; allow_ace_p = allow_ace_p->next) {
1750
1751 /*
1752 * Only mask off allow entries.
1753 */
1754
1755 if (allow_ace_p->attr != ALLOW_ACE)
1756 continue;
1757
1758 allow_ace_p->perms &= ~curr_ace->perms;
1759 }
1760
1761 /*
1762 * Now it's been applied, remove it.
1763 */
1764
1765 DLIST_REMOVE(ace_list, curr_ace);
1766 }
1767
1768 /* Pass 2 above - deal with deny user entries. */
1769
1770 for (curr_ace = ace_list; curr_ace; curr_ace = curr_ace_next) {
1771 mode_t new_perms = (mode_t)0;
1772 canon_ace *allow_ace_p;
1773
1774 curr_ace_next = curr_ace->next; /* So we can't lose the link. */
1775
1776 if (curr_ace->attr != DENY_ACE)
1777 continue;
1778
1779 if (curr_ace->owner_type != UID_ACE)
1780 continue;
1781
1782 if (curr_ace->perms == ALL_ACE_PERMS) {
1783
1784 /*
1785 * Optimisation - this is a deny everything to this user.
1786 * Convert to an allow nothing and push to the end of the list.
1787 */
1788
1789 curr_ace->attr = ALLOW_ACE;
1790 curr_ace->perms = (mode_t)0;
1791 DLIST_DEMOTE(ace_list, curr_ace, canon_ace *);
1792 continue;
1793 }
1794
1795 for (allow_ace_p = curr_ace->next; allow_ace_p; allow_ace_p = allow_ace_p->next) {
1796
1797 if (allow_ace_p->attr != ALLOW_ACE)
1798 continue;
1799
1800 /* We process GID_ACE and WORLD_ACE entries only. */
1801
1802 if (allow_ace_p->owner_type == UID_ACE)
1803 continue;
1804
1805 if (uid_entry_in_group( curr_ace, allow_ace_p))
1806 new_perms |= allow_ace_p->perms;
1807 }
1808
1809 /*
1810 * Convert to a allow entry, modify the perms and push to the end
1811 * of the list.
1812 */
1813
1814 curr_ace->attr = ALLOW_ACE;
1815 curr_ace->perms = (new_perms & ~curr_ace->perms);
1816 DLIST_DEMOTE(ace_list, curr_ace, canon_ace *);
1817 }
1818
1819 /* Pass 3 above - deal with deny group entries. */
1820
1821 for (curr_ace = ace_list; curr_ace; curr_ace = curr_ace_next) {
1822 canon_ace *allow_ace_p;
1823 canon_ace *allow_everyone_p = NULL;
1824
1825 curr_ace_next = curr_ace->next; /* So we can't lose the link. */
1826
1827 if (curr_ace->attr != DENY_ACE)
1828 continue;
1829
1830 if (curr_ace->owner_type != GID_ACE)
1831 continue;
1832
1833 for (allow_ace_p = curr_ace->next; allow_ace_p; allow_ace_p = allow_ace_p->next) {
1834
1835 if (allow_ace_p->attr != ALLOW_ACE)
1836 continue;
1837
1838 /* Store a pointer to the Everyone allow, if it exists. */
1839 if (allow_ace_p->owner_type == WORLD_ACE)
1840 allow_everyone_p = allow_ace_p;
1841
1842 /* We process UID_ACE entries only. */
1843
1844 if (allow_ace_p->owner_type != UID_ACE)
1845 continue;
1846
1847 /* Mask off the deny group perms. */
1848
1849 if (uid_entry_in_group( allow_ace_p, curr_ace))
1850 allow_ace_p->perms &= ~curr_ace->perms;
1851 }
1852
1853 /*
1854 * Convert the deny to an allow with the correct perms and
1855 * push to the end of the list.
1856 */
1857
1858 curr_ace->attr = ALLOW_ACE;
1859 if (allow_everyone_p)
1860 curr_ace->perms = allow_everyone_p->perms & ~curr_ace->perms;
1861 else
1862 curr_ace->perms = (mode_t)0;
1863 DLIST_DEMOTE(ace_list, curr_ace, canon_ace *);
1864 }
1865
1866 /* Doing this fourth pass allows Windows semantics to be layered
1867 * on top of POSIX semantics. I'm not sure if this is desirable.
1868 * For example, in W2K ACLs there is no way to say, "Group X no
1869 * access, user Y full access" if user Y is a member of group X.
1870 * This seems completely broken semantics to me.... JRA.
1871 */
1872
1873 #if 0
1874 /* Pass 4 above - deal with allow entries. */
1875
1876 for (curr_ace = ace_list; curr_ace; curr_ace = curr_ace_next) {
1877 canon_ace *allow_ace_p;
1878
1879 curr_ace_next = curr_ace->next; /* So we can't lose the link. */
1880
1881 if (curr_ace->attr != ALLOW_ACE)
1882 continue;
1883
1884 if (curr_ace->owner_type != UID_ACE)
1885 continue;
1886
1887 for (allow_ace_p = ace_list; allow_ace_p; allow_ace_p = allow_ace_p->next) {
1888
1889 if (allow_ace_p->attr != ALLOW_ACE)
1890 continue;
1891
1892 /* We process GID_ACE entries only. */
1893
1894 if (allow_ace_p->owner_type != GID_ACE)
1895 continue;
1896
1897 /* OR in the group perms. */
1898
1899 if (uid_entry_in_group( curr_ace, allow_ace_p))
1900 curr_ace->perms |= allow_ace_p->perms;
1901 }
1902 }
1903 #endif
1904
1905 *pp_ace_list = ace_list;
1906 }
1907
1908 /****************************************************************************
1909 Create a default mode that will be used if a security descriptor entry has
1910 no user/group/world entries.
1911 ****************************************************************************/
1912
1913 static mode_t create_default_mode(files_struct *fsp, BOOL interitable_mode)
1914 {
1915 int snum = SNUM(fsp->conn);
1916 mode_t and_bits = (mode_t)0;
1917 mode_t or_bits = (mode_t)0;
1918 mode_t mode = interitable_mode
1919 ? unix_mode( fsp->conn, FILE_ATTRIBUTE_ARCHIVE, fsp->fsp_name,
1920 NULL )
1921 : S_IRUSR;
1922
1923 if (fsp->is_directory)
1924 mode |= (S_IWUSR|S_IXUSR);
1925
1926 /*
1927 * Now AND with the create mode/directory mode bits then OR with the
1928 * force create mode/force directory mode bits.
1929 */
1930
1931 if (fsp->is_directory) {
1932 and_bits = lp_dir_security_mask(snum);
1933 or_bits = lp_force_dir_security_mode(snum);
1934 } else {
1935 and_bits = lp_security_mask(snum);
1936 or_bits = lp_force_security_mode(snum);
1937 }
1938
1939 return ((mode & and_bits)|or_bits);
1940 }
1941
1942 /****************************************************************************
1943 Unpack a SEC_DESC into two canonical ace lists. We don't depend on this
1944 succeeding.
1945 ****************************************************************************/
1946
1947 static BOOL unpack_canon_ace(files_struct *fsp,
1948 SMB_STRUCT_STAT *pst,
1949 DOM_SID *pfile_owner_sid,
1950 DOM_SID *pfile_grp_sid,
1951 canon_ace **ppfile_ace, canon_ace **ppdir_ace,
1952 uint32 security_info_sent, SEC_DESC *psd)
1953 {
1954 canon_ace *file_ace = NULL;
1955 canon_ace *dir_ace = NULL;
1956
1957 *ppfile_ace = NULL;
1958 *ppdir_ace = NULL;
1959
1960 if(security_info_sent == 0) {
1961 DEBUG(0,("unpack_canon_ace: no security info sent !\n"));
1962 return False;
1963 }
1964
1965 /*
1966 * If no DACL then this is a chown only security descriptor.
1967 */
1968
1969 if(!(security_info_sent & DACL_SECURITY_INFORMATION) || !psd->dacl)
1970 return True;
1971
1972 /*
1973 * Now go through the DACL and create the canon_ace lists.
1974 */
1975
1976 if (!create_canon_ace_lists( fsp, pst, pfile_owner_sid, pfile_grp_sid,
1977 &file_ace, &dir_ace, psd->dacl))
1978 return False;
1979
1980 if ((file_ace == NULL) && (dir_ace == NULL)) {
1981 /* W2K traverse DACL set - ignore. */
1982 return True;
1983 }
1984
1985 /*
1986 * Go through the canon_ace list and merge entries
1987 * belonging to identical users of identical allow or deny type.
1988 * We can do this as all deny entries come first, followed by
1989 * all allow entries (we have mandated this before accepting this acl).
1990 */
1991
1992 print_canon_ace_list( "file ace - before merge", file_ace);
1993 merge_aces( &file_ace );
1994
1995 print_canon_ace_list( "dir ace - before merge", dir_ace);
1996 merge_aces( &dir_ace );
1997
1998 /*
1999 * NT ACLs are order dependent. Go through the acl lists and
2000 * process DENY entries by masking the allow entries.
2001 */
2002
2003 print_canon_ace_list( "file ace - before deny", file_ace);
2004 process_deny_list( &file_ace);
2005
2006 print_canon_ace_list( "dir ace - before deny", dir_ace);
2007 process_deny_list( &dir_ace);
2008
2009 /*
2010 * A well formed POSIX file or default ACL has at least 3 entries, a
2011 * SMB_ACL_USER_OBJ, SMB_ACL_GROUP_OBJ, SMB_ACL_OTHER_OBJ
2012 * and optionally a mask entry. Ensure this is the case.
2013 */
2014
2015 print_canon_ace_list( "file ace - before valid", file_ace);
2016
2017 /*
2018 * A default 3 element mode entry for a file should be r-- --- ---.
2019 * A default 3 element mode entry for a directory should be rwx --- ---.
2020 */
2021
2022 pst->st_mode = create_default_mode(fsp, False);
2023
2024 if (!ensure_canon_entry_valid(&file_ace, fsp, pfile_owner_sid, pfile_grp_sid, pst, True)) {
2025 free_canon_ace_list(file_ace);
2026 free_canon_ace_list(dir_ace);
2027 return False;
2028 }
2029
2030 print_canon_ace_list( "dir ace - before valid", dir_ace);
2031
2032 /*
2033 * A default inheritable 3 element mode entry for a directory should be the
2034 * mode Samba will use to create a file within. Ensure user rwx bits are set if
2035 * it's a directory.
2036 */
2037
2038 pst->st_mode = create_default_mode(fsp, True);
2039
2040 if (dir_ace && !ensure_canon_entry_valid(&dir_ace, fsp, pfile_owner_sid, pfile_grp_sid, pst, True)) {
2041 free_canon_ace_list(file_ace);
2042 free_canon_ace_list(dir_ace);
2043 return False;
2044 }
2045
2046 print_canon_ace_list( "file ace - return", file_ace);
2047 print_canon_ace_list( "dir ace - return", dir_ace);
2048
2049 *ppfile_ace = file_ace;
2050 *ppdir_ace = dir_ace;
2051 return True;
2052
2053 }
2054
2055 /******************************************************************************
2056 When returning permissions, try and fit NT display
2057 semantics if possible. Note the the canon_entries here must have been malloced.
2058 The list format should be - first entry = owner, followed by group and other user
2059 entries, last entry = other.
2060
2061 Note that this doesn't exactly match the NT semantics for an ACL. As POSIX entries
2062 are not ordered, and match on the most specific entry rather than walking a list,
2063 then a simple POSIX permission of rw-r--r-- should really map to 5 entries,
2064
2065 Entry 0: owner : deny all except read and write.
2066 Entry 1: owner : allow read and write.
2067 Entry 2: group : deny all except read.
2068 Entry 3: group : allow read.
2069 Entry 4: Everyone : allow read.
2070
2071 But NT cannot display this in their ACL editor !
2072 ********************************************************************************/
2073
2074 static void arrange_posix_perms( char *filename, canon_ace **pp_list_head)
2075 {
2076 canon_ace *list_head = *pp_list_head;
2077 canon_ace *owner_ace = NULL;
2078 canon_ace *other_ace = NULL;
2079 canon_ace *ace = NULL;
2080
2081 for (ace = list_head; ace; ace = ace->next) {
2082 if (ace->type == SMB_ACL_USER_OBJ)
2083 owner_ace = ace;
2084 else if (ace->type == SMB_ACL_OTHER) {
2085 /* Last ace - this is "other" */
2086 other_ace = ace;
2087 }
2088 }
2089
2090 if (!owner_ace || !other_ace) {
2091 DEBUG(0,("arrange_posix_perms: Invalid POSIX permissions for file %s, missing owner or other.\n",
2092 filename ));
2093 return;
2094 }
2095
2096 /*
2097 * The POSIX algorithm applies to owner first, and other last,
2098 * so ensure they are arranged in this order.
2099 */
2100
2101 if (owner_ace) {
2102 DLIST_PROMOTE(list_head, owner_ace);
2103 }
2104
2105 if (other_ace) {
2106 DLIST_DEMOTE(list_head, other_ace, canon_ace *);
2107 }
2108
2109 /* We have probably changed the head of the list. */
2110
2111 *pp_list_head = list_head;
2112 }
2113
2114 /****************************************************************************
2115 Create a linked list of canonical ACE entries.
2116 ****************************************************************************/
2117
2118 static canon_ace *canonicalise_acl( files_struct *fsp, SMB_ACL_T posix_acl, SMB_STRUCT_STAT *psbuf,
2119 const DOM_SID *powner, const DOM_SID *pgroup, struct pai_val *pal, SMB_ACL_TYPE_T the_acl_type)
2120 {
2121 connection_struct *conn = fsp->conn;
2122 mode_t acl_mask = (S_IRUSR|S_IWUSR|S_IXUSR);
2123 canon_ace *list_head = NULL;
2124 canon_ace *ace = NULL;
2125 canon_ace *next_ace = NULL;
2126 int entry_id = SMB_ACL_FIRST_ENTRY;
2127 SMB_ACL_ENTRY_T entry;
2128 size_t ace_count;
2129
2130 while ( posix_acl && (SMB_VFS_SYS_ACL_GET_ENTRY(conn, posix_acl, entry_id, &entry) == 1)) {
2131 SMB_ACL_TAG_T tagtype;
2132 SMB_ACL_PERMSET_T permset;
2133 DOM_SID sid;
2134 posix_id unix_ug;
2135 enum ace_owner owner_type;
2136
2137 /* get_next... */
2138 if (entry_id == SMB_ACL_FIRST_ENTRY)
2139 entry_id = SMB_ACL_NEXT_ENTRY;
2140
2141 /* Is this a MASK entry ? */
2142 if (SMB_VFS_SYS_ACL_GET_TAG_TYPE(conn, entry, &tagtype) == -1)
2143 continue;
2144
2145 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, entry, &permset) == -1)
2146 continue;
2147
2148 /* Decide which SID to use based on the ACL type. */
2149 switch(tagtype) {
2150 case SMB_ACL_USER_OBJ:
2151 /* Get the SID from the owner. */
2152 sid_copy(&sid, powner);
2153 unix_ug.uid = psbuf->st_uid;
2154 owner_type = UID_ACE;
2155 break;
2156 case SMB_ACL_USER:
2157 {
2158 uid_t *puid = (uid_t *)SMB_VFS_SYS_ACL_GET_QUALIFIER(conn, entry);
2159 if (puid == NULL) {
2160 DEBUG(0,("canonicalise_acl: Failed to get uid.\n"));
2161 continue;
2162 }
2163 /*
2164 * A SMB_ACL_USER entry for the owner is shadowed by the
2165 * SMB_ACL_USER_OBJ entry and Windows also cannot represent
2166 * that entry, so we ignore it. We also don't create such
2167 * entries out of the blue when setting ACLs, so a get/set
2168 * cycle will drop them.
2169 */
2170 if (the_acl_type == SMB_ACL_TYPE_ACCESS && *puid == psbuf->st_uid) {
2171 SMB_VFS_SYS_ACL_FREE_QUALIFIER(conn, (void *)puid,tagtype);
2172 continue;
2173 }
2174 uid_to_sid( &sid, *puid);
2175 unix_ug.uid = *puid;
2176 owner_type = UID_ACE;
2177 SMB_VFS_SYS_ACL_FREE_QUALIFIER(conn, (void *)puid,tagtype);
2178 break;
2179 }
2180 case SMB_ACL_GROUP_OBJ:
2181 /* Get the SID from the owning group. */
2182 sid_copy(&sid, pgroup);
2183 unix_ug.gid = psbuf->st_gid;
2184 owner_type = GID_ACE;
2185 break;
2186 case SMB_ACL_GROUP:
2187 {
2188 gid_t *pgid = (gid_t *)SMB_VFS_SYS_ACL_GET_QUALIFIER(conn, entry);
2189 if (pgid == NULL) {
2190 DEBUG(0,("canonicalise_acl: Failed to get gid.\n"));
2191 continue;
2192 }
2193 gid_to_sid( &sid, *pgid);
2194 unix_ug.gid = *pgid;
2195 owner_type = GID_ACE;
2196 SMB_VFS_SYS_ACL_FREE_QUALIFIER(conn, (void *)pgid,tagtype);
2197 break;
2198 }
2199 case SMB_ACL_MASK:
2200 acl_mask = convert_permset_to_mode_t(conn, permset);
2201 continue; /* Don't count the mask as an entry. */
2202 case SMB_ACL_OTHER:
2203 /* Use the Everyone SID */
2204 sid = global_sid_World;
2205 unix_ug.world = -1;
2206 owner_type = WORLD_ACE;
2207 break;
2208 default:
2209 DEBUG(0,("canonicalise_acl: Unknown tagtype %u\n", (unsigned int)tagtype));
2210 continue;
2211 }
2212
2213 /*
2214 * Add this entry to the list.
2215 */
2216
2217 if ((ace = SMB_MALLOC_P(canon_ace)) == NULL)
2218 goto fail;
2219
2220 ZERO_STRUCTP(ace);
2221 ace->type = tagtype;
2222 ace->perms = convert_permset_to_mode_t(conn, permset);
2223 ace->attr = ALLOW_ACE;
2224 ace->trustee = sid;
2225 ace->unix_ug = unix_ug;
2226 ace->owner_type = owner_type;
2227 ace->inherited = get_inherited_flag(pal, ace, (the_acl_type == SMB_ACL_TYPE_DEFAULT));
2228
2229 DLIST_ADD(list_head, ace);
2230 }
2231
2232 /*
2233 * This next call will ensure we have at least a user/group/world set.
2234 */
2235
2236 if (!ensure_canon_entry_valid(&list_head, fsp, powner, pgroup, psbuf, False))
2237 goto fail;
2238
2239 /*
2240 * Now go through the list, masking the permissions with the
2241 * acl_mask. Ensure all DENY Entries are at the start of the list.
2242 */
2243
2244 DEBUG(10,("canonicalise_acl: %s ace entries before arrange :\n", the_acl_type == SMB_ACL_TYPE_ACCESS ? "Access" : "Default" ));
2245
2246 for ( ace_count = 0, ace = list_head; ace; ace = next_ace, ace_count++) {
2247 next_ace = ace->next;
2248
2249 /* Masks are only applied to entries other than USER_OBJ and OTHER. */
2250 if (ace->type != SMB_ACL_OTHER && ace->type != SMB_ACL_USER_OBJ)
2251 ace->perms &= acl_mask;
2252
2253 if (ace->perms == 0) {
2254 DLIST_PROMOTE(list_head, ace);
2255 }
2256
2257 if( DEBUGLVL( 10 ) ) {
2258 print_canon_ace(ace, ace_count);
2259 }
2260 }
2261
2262 arrange_posix_perms(fsp->fsp_name,&list_head );
2263
2264 print_canon_ace_list( "canonicalise_acl: ace entries after arrange", list_head );
2265
2266 return list_head;
2267
2268 fail:
2269
2270 free_canon_ace_list(list_head);
2271 return NULL;
2272 }
2273
2274 /****************************************************************************
2275 Check if the current user group list contains a given group.
2276 ****************************************************************************/
2277
2278 static BOOL current_user_in_group(gid_t gid)
2279 {
2280 int i;
2281
2282 for (i = 0; i < current_user.ut.ngroups; i++) {
2283 if (current_user.ut.groups[i] == gid) {
2284 return True;
2285 }
2286 }
2287
2288 return False;
2289 }
2290
2291 /****************************************************************************
2292 Should we override a deny ? Check deprecated 'acl group control'
2293 and 'dos filemode'
2294 ****************************************************************************/
2295
2296 static BOOL acl_group_override(connection_struct *conn, gid_t prim_gid)
2297 {
2298 if ( (errno == EACCES || errno == EPERM)
2299 && (lp_acl_group_control(SNUM(conn)) || lp_dos_filemode(SNUM(conn)))
2300 && current_user_in_group(prim_gid))
2301 {
2302 return True;
2303 }
2304
2305 return False;
2306 }
2307
2308 /****************************************************************************
2309 Attempt to apply an ACL to a file or directory.
2310 ****************************************************************************/
2311
2312 static BOOL set_canon_ace_list(files_struct *fsp, canon_ace *the_ace, BOOL default_ace, gid_t prim_gid, BOOL *pacl_set_support)
2313 {
2314 connection_struct *conn = fsp->conn;
2315 BOOL ret = False;
2316 SMB_ACL_T the_acl = SMB_VFS_SYS_ACL_INIT(conn, (int)count_canon_ace_list(the_ace) + 1);
2317 canon_ace *p_ace;
2318 int i;
2319 SMB_ACL_ENTRY_T mask_entry;
2320 BOOL got_mask_entry = False;
2321 SMB_ACL_PERMSET_T mask_permset;
2322 SMB_ACL_TYPE_T the_acl_type = (default_ace ? SMB_ACL_TYPE_DEFAULT : SMB_ACL_TYPE_ACCESS);
2323 BOOL needs_mask = False;
2324 mode_t mask_perms = 0;
2325
2326 #if defined(POSIX_ACL_NEEDS_MASK)
2327 /* HP-UX always wants to have a mask (called "class" there). */
2328 needs_mask = True;
2329 #endif
2330
2331 if (the_acl == NULL) {
2332
2333 if (!no_acl_syscall_error(errno)) {
2334 /*
2335 * Only print this error message if we have some kind of ACL
2336 * support that's not working. Otherwise we would always get this.
2337 */
2338 DEBUG(0,("set_canon_ace_list: Unable to init %s ACL. (%s)\n",
2339 default_ace ? "default" : "file", strerror(errno) ));
2340 }
2341 *pacl_set_support = False;
2342 return False;
2343 }
2344
2345 if( DEBUGLVL( 10 )) {
2346 dbgtext("set_canon_ace_list: setting ACL:\n");
2347 for (i = 0, p_ace = the_ace; p_ace; p_ace = p_ace->next, i++ ) {
2348 print_canon_ace( p_ace, i);
2349 }
2350 }
2351
2352 for (i = 0, p_ace = the_ace; p_ace; p_ace = p_ace->next, i++ ) {
2353 SMB_ACL_ENTRY_T the_entry;
2354 SMB_ACL_PERMSET_T the_permset;
2355
2356 /*
2357 * ACLs only "need" an ACL_MASK entry if there are any named user or
2358 * named group entries. But if there is an ACL_MASK entry, it applies
2359 * to ACL_USER, ACL_GROUP, and ACL_GROUP_OBJ entries. Set the mask
2360 * so that it doesn't deny (i.e., mask off) any permissions.
2361 */
2362
2363 if (p_ace->type == SMB_ACL_USER || p_ace->type == SMB_ACL_GROUP) {
2364 needs_mask = True;
2365 mask_perms |= p_ace->perms;
2366 } else if (p_ace->type == SMB_ACL_GROUP_OBJ) {
2367 mask_perms |= p_ace->perms;
2368 }
2369
2370 /*
2371 * Get the entry for this ACE.
2372 */
2373
2374 if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &the_acl, &the_entry) == -1) {
2375 DEBUG(0,("set_canon_ace_list: Failed to create entry %d. (%s)\n",
2376 i, strerror(errno) ));
2377 goto fail;
2378 }
2379
2380 if (p_ace->type == SMB_ACL_MASK) {
2381 mask_entry = the_entry;
2382 got_mask_entry = True;
2383 }
2384
2385 /*
2386 * Ok - we now know the ACL calls should be working, don't
2387 * allow fallback to chmod.
2388 */
2389
2390 *pacl_set_support = True;
2391
2392 /*
2393 * Initialise the entry from the canon_ace.
2394 */
2395
2396 /*
2397 * First tell the entry what type of ACE this is.
2398 */
2399
2400 if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, the_entry, p_ace->type) == -1) {
2401 DEBUG(0,("set_canon_ace_list: Failed to set tag type on entry %d. (%s)\n",
2402 i, strerror(errno) ));
2403 goto fail;
2404 }
2405
2406 /*
2407 * Only set the qualifier (user or group id) if the entry is a user
2408 * or group id ACE.
2409 */
2410
2411 if ((p_ace->type == SMB_ACL_USER) || (p_ace->type == SMB_ACL_GROUP)) {
2412 if (SMB_VFS_SYS_ACL_SET_QUALIFIER(conn, the_entry,(void *)&p_ace->unix_ug.uid) == -1) {
2413 DEBUG(0,("set_canon_ace_list: Failed to set qualifier on entry %d. (%s)\n",
2414 i, strerror(errno) ));
2415 goto fail;
2416 }
2417 }
2418
2419 /*
2420 * Convert the mode_t perms in the canon_ace to a POSIX permset.
2421 */
2422
2423 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, the_entry, &the_permset) == -1) {
2424 DEBUG(0,("set_canon_ace_list: Failed to get permset on entry %d. (%s)\n",
2425 i, strerror(errno) ));
2426 goto fail;
2427 }
2428
2429 if (map_acl_perms_to_permset(conn, p_ace->perms, &the_permset) == -1) {
2430 DEBUG(0,("set_canon_ace_list: Failed to create permset for mode (%u) on entry %d. (%s)\n",
2431 (unsigned int)p_ace->perms, i, strerror(errno) ));
2432 goto fail;
2433 }
2434
2435 /*
2436 * ..and apply them to the entry.
2437 */
2438
2439 if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, the_entry, the_permset) == -1) {
2440 DEBUG(0,("set_canon_ace_list: Failed to add permset on entry %d. (%s)\n",
2441 i, strerror(errno) ));
2442 goto fail;
2443 }
2444
2445 if( DEBUGLVL( 10 ))
2446 print_canon_ace( p_ace, i);
2447
2448 }
2449
2450 if (needs_mask && !got_mask_entry) {
2451 if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &the_acl, &mask_entry) == -1) {
2452 DEBUG(0,("set_canon_ace_list: Failed to create mask entry. (%s)\n", strerror(errno) ));
2453 goto fail;
2454 }
2455
2456 if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, mask_entry, SMB_ACL_MASK) == -1) {
2457 DEBUG(0,("set_canon_ace_list: Failed to set tag type on mask entry. (%s)\n",strerror(errno) ));
2458 goto fail;
2459 }
2460
2461 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, mask_entry, &mask_permset) == -1) {
2462 DEBUG(0,("set_canon_ace_list: Failed to get mask permset. (%s)\n", strerror(errno) ));
2463 goto fail;
2464 }
2465
2466 if (map_acl_perms_to_permset(conn, S_IRUSR|S_IWUSR|S_IXUSR, &mask_permset) == -1) {
2467 DEBUG(0,("set_canon_ace_list: Failed to create mask permset. (%s)\n", strerror(errno) ));
2468 goto fail;
2469 }
2470
2471 if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, mask_entry, mask_permset) == -1) {
2472 DEBUG(0,("set_canon_ace_list: Failed to add mask permset. (%s)\n", strerror(errno) ));
2473 goto fail;
2474 }
2475 }
2476
2477 /*
2478 * Finally apply it to the file or directory.
2479 */
2480
2481 if(default_ace || fsp->is_directory || fsp->fh->fd == -1) {
2482 if (SMB_VFS_SYS_ACL_SET_FILE(conn, fsp->fsp_name, the_acl_type, the_acl) == -1) {
2483 /*
2484 * Some systems allow all the above calls and only fail with no ACL support
2485 * when attempting to apply the acl. HPUX with HFS is an example of this. JRA.
2486 */
2487 if (no_acl_syscall_error(errno)) {
2488 *pacl_set_support = False;
2489 }
2490
2491 if (acl_group_override(conn, prim_gid)) {
2492 int sret;
2493
2494 DEBUG(5,("set_canon_ace_list: acl group control on and current user in file %s primary group.\n",
2495 fsp->fsp_name ));
2496
2497 become_root();
2498 sret = SMB_VFS_SYS_ACL_SET_FILE(conn, fsp->fsp_name, the_acl_type, the_acl);
2499 unbecome_root();
2500 if (sret == 0) {
2501 ret = True;
2502 }
2503 }
2504
2505 if (ret == False) {
2506 DEBUG(2,("set_canon_ace_list: sys_acl_set_file type %s failed for file %s (%s).\n",
2507 the_acl_type == SMB_ACL_TYPE_DEFAULT ? "directory default" : "file",
2508 fsp->fsp_name, strerror(errno) ));
2509 goto fail;
2510 }
2511 }
2512 } else {
2513 if (SMB_VFS_SYS_ACL_SET_FD(fsp, fsp->fh->fd, the_acl) == -1) {
2514 /*
2515 * Some systems allow all the above calls and only fail with no ACL support
2516 * when attempting to apply the acl. HPUX with HFS is an example of this. JRA.
2517 */
2518 if (no_acl_syscall_error(errno)) {
2519 *pacl_set_support = False;
2520 }
2521
2522 if (acl_group_override(conn, prim_gid)) {
2523 int sret;
2524
2525 DEBUG(5,("set_canon_ace_list: acl group control on and current user in file %s primary group.\n",
2526 fsp->fsp_name ));
2527
2528 become_root();
2529 sret = SMB_VFS_SYS_ACL_SET_FD(fsp, fsp->fh->fd, the_acl);
2530 unbecome_root();
2531 if (sret == 0) {
2532 ret = True;
2533 }
2534 }
2535
2536 if (ret == False) {
2537 DEBUG(2,("set_canon_ace_list: sys_acl_set_file failed for file %s (%s).\n",
2538 fsp->fsp_name, strerror(errno) ));
2539 goto fail;
2540 }
2541 }
2542 }
2543
2544 ret = True;
2545
2546 fail:
2547
2548 if (the_acl != NULL) {
2549 SMB_VFS_SYS_ACL_FREE_ACL(conn, the_acl);
2550 }
2551
2552 return ret;
2553 }
2554
2555 /****************************************************************************
2556 Find a particular canon_ace entry.
2557 ****************************************************************************/
2558
2559 static struct canon_ace *canon_ace_entry_for(struct canon_ace *list, SMB_ACL_TAG_T type, posix_id *id)
2560 {
2561 while (list) {
2562 if (list->type == type && ((type != SMB_ACL_USER && type != SMB_ACL_GROUP) ||
2563 (type == SMB_ACL_USER && id && id->uid == list->unix_ug.uid) ||
2564 (type == SMB_ACL_GROUP && id && id->gid == list->unix_ug.gid)))
2565 break;
2566 list = list->next;
2567 }
2568 return list;
2569 }
2570
2571 /****************************************************************************
2572
2573 ****************************************************************************/
2574
2575 SMB_ACL_T free_empty_sys_acl(connection_struct *conn, SMB_ACL_T the_acl)
2576 {
2577 SMB_ACL_ENTRY_T entry;
2578
2579 if (!the_acl)
2580 return NULL;
2581 if (SMB_VFS_SYS_ACL_GET_ENTRY(conn, the_acl, SMB_ACL_FIRST_ENTRY, &entry) != 1) {
2582 SMB_VFS_SYS_ACL_FREE_ACL(conn, the_acl);
2583 return NULL;
2584 }
2585 return the_acl;
2586 }
2587
2588 /****************************************************************************
2589 Convert a canon_ace to a generic 3 element permission - if possible.
2590 ****************************************************************************/
2591
2592 #define MAP_PERM(p,mask,result) (((p) & (mask)) ? (result) : 0 )
2593
2594 static BOOL convert_canon_ace_to_posix_perms( files_struct *fsp, canon_ace *file_ace_list, mode_t *posix_perms)
2595 {
2596 int snum = SNUM(fsp->conn);
2597 size_t ace_count = count_canon_ace_list(file_ace_list);
2598 canon_ace *ace_p;
2599 canon_ace *owner_ace = NULL;
2600 canon_ace *group_ace = NULL;
2601 canon_ace *other_ace = NULL;
2602 mode_t and_bits;
2603 mode_t or_bits;
2604
2605 if (ace_count != 3) {
2606 DEBUG(3,("convert_canon_ace_to_posix_perms: Too many ACE entries for file %s to convert to \
2607 posix perms.\n", fsp->fsp_name ));
2608 return False;
2609 }
2610
2611 for (ace_p = file_ace_list; ace_p; ace_p = ace_p->next) {
2612 if (ace_p->owner_type == UID_ACE)
2613 owner_ace = ace_p;
2614 else if (ace_p->owner_type == GID_ACE)
2615 group_ace = ace_p;
2616 else if (ace_p->owner_type == WORLD_ACE)
2617 other_ace = ace_p;
2618 }
2619
2620 if (!owner_ace || !group_ace || !other_ace) {
2621 DEBUG(3,("convert_canon_ace_to_posix_perms: Can't get standard entries for file %s.\n",
2622 fsp->fsp_name ));
2623 return False;
2624 }
2625
2626 *posix_perms = (mode_t)0;
2627
2628 *posix_perms |= owner_ace->perms;
2629 *posix_perms |= MAP_PERM(group_ace->perms, S_IRUSR, S_IRGRP);
2630 *posix_perms |= MAP_PERM(group_ace->perms, S_IWUSR, S_IWGRP);
2631 *posix_perms |= MAP_PERM(group_ace->perms, S_IXUSR, S_IXGRP);
2632 *posix_perms |= MAP_PERM(other_ace->perms, S_IRUSR, S_IROTH);
2633 *posix_perms |= MAP_PERM(other_ace->perms, S_IWUSR, S_IWOTH);
2634 *posix_perms |= MAP_PERM(other_ace->perms, S_IXUSR, S_IXOTH);
2635
2636 /* The owner must have at least read access. */
2637
2638 *posix_perms |= S_IRUSR;
2639 if (fsp->is_directory)
2640 *posix_perms |= (S_IWUSR|S_IXUSR);
2641
2642 /* If requested apply the masks. */
2643
2644 /* Get the initial bits to apply. */
2645
2646 if (fsp->is_directory) {
2647 and_bits = lp_dir_security_mask(snum);
2648 or_bits = lp_force_dir_security_mode(snum);
2649 } else {
2650 and_bits = lp_security_mask(snum);
2651 or_bits = lp_force_security_mode(snum);
2652 }
2653
2654 *posix_perms = (((*posix_perms) & and_bits)|or_bits);
2655
2656 DEBUG(10,("convert_canon_ace_to_posix_perms: converted u=%o,g=%o,w=%o to perm=0%o for file %s.\n",
2657 (int)owner_ace->perms, (int)group_ace->perms, (int)other_ace->perms, (int)*posix_perms,
2658 fsp->fsp_name ));
2659
2660 return True;
2661 }
2662
2663 /****************************************************************************
2664 Incoming NT ACLs on a directory can be split into a default POSIX acl (CI|OI|IO) and
2665 a normal POSIX acl. Win2k needs these split acls re-merging into one ACL
2666 with CI|OI set so it is inherited and also applies to the directory.
2667 Based on code from "Jim McDonough" <jmcd@us.ibm.com>.
2668 ****************************************************************************/
2669
2670 static size_t merge_default_aces( SEC_ACE *nt_ace_list, size_t num_aces)
2671 {
2672 size_t i, j;
2673
2674 for (i = 0; i < num_aces; i++) {
2675 for (j = i+1; j < num_aces; j++) {
2676 uint32 i_flags_ni = (nt_ace_list[i].flags & ~SEC_ACE_FLAG_INHERITED_ACE);
2677 uint32 j_flags_ni = (nt_ace_list[j].flags & ~SEC_ACE_FLAG_INHERITED_ACE);
2678 BOOL i_inh = (nt_ace_list[i].flags & SEC_ACE_FLAG_INHERITED_ACE) ? True : False;
2679 BOOL j_inh = (nt_ace_list[j].flags & SEC_ACE_FLAG_INHERITED_ACE) ? True : False;
2680
2681 /* We know the lower number ACE's are file entries. */
2682 if ((nt_ace_list[i].type == nt_ace_list[j].type) &&
2683 (nt_ace_list[i].size == nt_ace_list[j].size) &&
2684 (nt_ace_list[i].access_mask == nt_ace_list[j].access_mask) &&
2685 sid_equal(&nt_ace_list[i].trustee, &nt_ace_list[j].trustee) &&
2686 (i_inh == j_inh) &&
2687 (i_flags_ni == 0) &&
2688 (j_flags_ni == (SEC_ACE_FLAG_OBJECT_INHERIT|
2689 SEC_ACE_FLAG_CONTAINER_INHERIT|
2690 SEC_ACE_FLAG_INHERIT_ONLY))) {
2691 /*
2692 * W2K wants to have access allowed zero access ACE's
2693 * at the end of the list. If the mask is zero, merge
2694 * the non-inherited ACE onto the inherited ACE.
2695 */
2696
2697 if (nt_ace_list[i].access_mask == 0) {
2698 nt_ace_list[j].flags = SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT|
2699 (i_inh ? SEC_ACE_FLAG_INHERITED_ACE : 0);
2700 if (num_aces - i - 1 > 0)
2701 memmove(&nt_ace_list[i], &nt_ace_list[i+1], (num_aces-i-1) *
2702 sizeof(SEC_ACE));
2703
2704 DEBUG(10,("merge_default_aces: Merging zero access ACE %u onto ACE %u.\n",
2705 (unsigned int)i, (unsigned int)j ));
2706 } else {
2707 /*
2708 * These are identical except for the flags.
2709 * Merge the inherited ACE onto the non-inherited ACE.
2710 */
2711
2712 nt_ace_list[i].flags = SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT|
2713 (i_inh ? SEC_ACE_FLAG_INHERITED_ACE : 0);
2714 if (num_aces - j - 1 > 0)
2715 memmove(&nt_ace_list[j], &nt_ace_list[j+1], (num_aces-j-1) *
2716 sizeof(SEC_ACE));
2717
2718 DEBUG(10,("merge_default_aces: Merging ACE %u onto ACE %u.\n",
2719 (unsigned int)j, (unsigned int)i ));
2720 }
2721 num_aces--;
2722 break;
2723 }
2724 }
2725 }
2726
2727 return num_aces;
2728 }
2729 /****************************************************************************
2730 Reply to query a security descriptor from an fsp. If it succeeds it allocates
2731 the space for the return elements and returns the size needed to return the
2732 security descriptor. This should be the only external function needed for
2733 the UNIX style get ACL.
2734 ****************************************************************************/
2735
2736 size_t get_nt_acl(files_struct *fsp, uint32 security_info, SEC_DESC **ppdesc)
2737 {
2738 connection_struct *conn = fsp->conn;
2739 SMB_STRUCT_STAT sbuf;
2740 SEC_ACE *nt_ace_list = NULL;
2741 DOM_SID owner_sid;
2742 DOM_SID group_sid;
2743 size_t sd_size = 0;
2744 SEC_ACL *psa = NULL;
2745 size_t num_acls = 0;
2746 size_t num_def_acls = 0;
2747 size_t num_aces = 0;
2748 SMB_ACL_T posix_acl = NULL;
2749 SMB_ACL_T def_acl = NULL;
2750 canon_ace *file_ace = NULL;
2751 canon_ace *dir_ace = NULL;
2752 size_t num_profile_acls = 0;
2753 struct pai_val *pal = NULL;
2754 SEC_DESC *psd = NULL;
2755
2756 *ppdesc = NULL;
2757
2758 DEBUG(10,("get_nt_acl: called for file %s\n", fsp->fsp_name ));
2759
2760 if(fsp->is_directory || fsp->fh->fd == -1) {
2761
2762 /* Get the stat struct for the owner info. */
2763 if(SMB_VFS_STAT(fsp->conn,fsp->fsp_name, &sbuf) != 0) {
2764 return 0;
2765 }
2766 /*
2767 * Get the ACL from the path.
2768 */
2769
2770 posix_acl = SMB_VFS_SYS_ACL_GET_FILE(conn, fsp->fsp_name, SMB_ACL_TYPE_ACCESS);
2771
2772 /*
2773 * If it's a directory get the default POSIX ACL.
2774 */
2775
2776 if(fsp->is_directory) {
2777 def_acl = SMB_VFS_SYS_ACL_GET_FILE(conn, fsp->fsp_name, SMB_ACL_TYPE_DEFAULT);
2778 def_acl = free_empty_sys_acl(conn, def_acl);
2779 }
2780
2781 } else {
2782
2783 /* Get the stat struct for the owner info. */
2784 if(SMB_VFS_FSTAT(fsp,fsp->fh->fd,&sbuf) != 0) {
2785 return 0;
2786 }
2787 /*
2788 * Get the ACL from the fd.
2789 */
2790 posix_acl = SMB_VFS_SYS_ACL_GET_FD(fsp, fsp->fh->fd);
2791 }
2792
2793 DEBUG(5,("get_nt_acl : file ACL %s, directory ACL %s\n",
2794 posix_acl ? "present" : "absent",
2795 def_acl ? "present" : "absent" ));
2796
2797 pal = load_inherited_info(fsp);
2798
2799 /*
2800 * Get the owner, group and world SIDs.
2801 */
2802
2803 if (lp_profile_acls(SNUM(conn))) {
2804 /* For WXP SP1 the owner must be administrators. */
2805 sid_copy(&owner_sid, &global_sid_Builtin_Administrators);
2806 sid_copy(&group_sid, &global_sid_Builtin_Users);
2807 num_profile_acls = 2;
2808 } else {
2809 create_file_sids(&sbuf, &owner_sid, &group_sid);
2810 }
2811
2812 if ((security_info & DACL_SECURITY_INFORMATION) && !(security_info & PROTECTED_DACL_SECURITY_INFORMATION)) {
2813
2814 /*
2815 * In the optimum case Creator Owner and Creator Group would be used for
2816 * the ACL_USER_OBJ and ACL_GROUP_OBJ entries, respectively, but this
2817 * would lead to usability problems under Windows: The Creator entries
2818 * are only available in browse lists of directories and not for files;
2819 * additionally the identity of the owning group couldn't be determined.
2820 * We therefore use those identities only for Default ACLs.
2821 */
2822
2823 /* Create the canon_ace lists. */
2824 file_ace = canonicalise_acl( fsp, posix_acl, &sbuf, &owner_sid, &group_sid, pal, SMB_ACL_TYPE_ACCESS );
2825
2826 /* We must have *some* ACLS. */
2827
2828 if (count_canon_ace_list(file_ace) == 0) {
2829 DEBUG(0,("get_nt_acl : No ACLs on file (%s) !\n", fsp->fsp_name ));
2830 goto done;
2831 }
2832
2833 if (fsp->is_directory && def_acl) {
2834 dir_ace = canonicalise_acl(fsp, def_acl, &sbuf,
2835 &global_sid_Creator_Owner,
2836 &global_sid_Creator_Group, pal, SMB_ACL_TYPE_DEFAULT );
2837 }
2838
2839 /*
2840 * Create the NT ACE list from the canonical ace lists.
2841 */
2842
2843 {
2844 canon_ace *ace;
2845 int nt_acl_type;
2846 int i;
2847
2848 if (nt4_compatible_acls() && dir_ace) {
2849 /*
2850 * NT 4 chokes if an ACL contains an INHERIT_ONLY entry
2851 * but no non-INHERIT_ONLY entry for one SID. So we only
2852 * remove entries from the Access ACL if the
2853 * corresponding Default ACL entries have also been
2854 * removed. ACEs for CREATOR-OWNER and CREATOR-GROUP
2855 * are exceptions. We can do nothing
2856 * intelligent if the Default ACL contains entries that
2857 * are not also contained in the Access ACL, so this
2858 * case will still fail under NT 4.
2859 */
2860
2861 ace = canon_ace_entry_for(dir_ace, SMB_ACL_OTHER, NULL);
2862 if (ace && !ace->perms) {
2863 DLIST_REMOVE(dir_ace, ace);
2864 SAFE_FREE(ace);
2865
2866 ace = canon_ace_entry_for(file_ace, SMB_ACL_OTHER, NULL);
2867 if (ace && !ace->perms) {
2868 DLIST_REMOVE(file_ace, ace);
2869 SAFE_FREE(ace);
2870 }
2871 }
2872
2873 /*
2874 * WinNT doesn't usually have Creator Group
2875 * in browse lists, so we send this entry to
2876 * WinNT even if it contains no relevant
2877 * permissions. Once we can add
2878 * Creator Group to browse lists we can
2879 * re-enable this.
2880 */
2881
2882 #if 0
2883 ace = canon_ace_entry_for(dir_ace, SMB_ACL_GROUP_OBJ, NULL);
2884 if (ace && !ace->perms) {
2885 DLIST_REMOVE(dir_ace, ace);
2886 SAFE_FREE(ace);
2887 }
2888 #endif
2889
2890 ace = canon_ace_entry_for(file_ace, SMB_ACL_GROUP_OBJ, NULL);
2891 if (ace && !ace->perms) {
2892 DLIST_REMOVE(file_ace, ace);
2893 SAFE_FREE(ace);
2894 }
2895 }
2896
2897 num_acls = count_canon_ace_list(file_ace);
2898 num_def_acls = count_canon_ace_list(dir_ace);
2899
2900 /* Allocate the ace list. */
2901 if ((nt_ace_list = SMB_MALLOC_ARRAY(SEC_ACE,num_acls + num_profile_acls + num_def_acls)) == NULL) {
2902 DEBUG(0,("get_nt_acl: Unable to malloc space for nt_ace_list.\n"));
2903 goto done;
2904 }
2905
2906 memset(nt_ace_list, '\0', (num_acls + num_def_acls) * sizeof(SEC_ACE) );
2907
2908 /*
2909 * Create the NT ACE list from the canonical ace lists.
2910 */
2911
2912 ace = file_ace;
2913
2914 for (i = 0; i < num_acls; i++, ace = ace->next) {
2915 SEC_ACCESS acc;
2916
2917 acc = map_canon_ace_perms(SNUM(conn),
2918 &nt_acl_type,
2919 ace->perms,
2920 fsp->is_directory);
2921 init_sec_ace(&nt_ace_list[num_aces++],
2922 &ace->trustee,
2923 nt_acl_type,
2924 acc,
2925 ace->inherited ?
2926 SEC_ACE_FLAG_INHERITED_ACE : 0);
2927 }
2928
2929 /* The User must have access to a profile share - even
2930 * if we can't map the SID. */
2931 if (lp_profile_acls(SNUM(conn))) {
2932 SEC_ACCESS acc;
2933
2934 init_sec_access(&acc,FILE_GENERIC_ALL);
2935 init_sec_ace(&nt_ace_list[num_aces++],
2936 &global_sid_Builtin_Users,
2937 SEC_ACE_TYPE_ACCESS_ALLOWED,
2938 acc, 0);
2939 }
2940
2941 ace = dir_ace;
2942
2943 for (i = 0; i < num_def_acls; i++, ace = ace->next) {
2944 SEC_ACCESS acc;
2945
2946 acc = map_canon_ace_perms(SNUM(conn),
2947 &nt_acl_type,
2948 ace->perms,
2949 fsp->is_directory);
2950 init_sec_ace(&nt_ace_list[num_aces++],
2951 &ace->trustee,
2952 nt_acl_type,
2953 acc,
2954 SEC_ACE_FLAG_OBJECT_INHERIT|
2955 SEC_ACE_FLAG_CONTAINER_INHERIT|
2956 SEC_ACE_FLAG_INHERIT_ONLY|
2957 (ace->inherited ?
2958 SEC_ACE_FLAG_INHERITED_ACE : 0));
2959 }
2960
2961 /* The User must have access to a profile share - even
2962 * if we can't map the SID. */
2963 if (lp_profile_acls(SNUM(conn))) {
2964 SEC_ACCESS acc;
2965
2966 init_sec_access(&acc,FILE_GENERIC_ALL);
2967 init_sec_ace(&nt_ace_list[num_aces++], &global_sid_Builtin_Users, SEC_ACE_TYPE_ACCESS_ALLOWED, acc,
2968 SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT|
2969 SEC_ACE_FLAG_INHERIT_ONLY|0);
2970 }
2971
2972 /*
2973 * Merge POSIX default ACLs and normal ACLs into one NT ACE.
2974 * Win2K needs this to get the inheritance correct when replacing ACLs
2975 * on a directory tree. Based on work by Jim @ IBM.
2976 */
2977
2978 num_aces = merge_default_aces(nt_ace_list, num_aces);
2979
2980 }
2981
2982 if (num_aces) {
2983 if((psa = make_sec_acl( main_loop_talloc_get(), NT4_ACL_REVISION, num_aces, nt_ace_list)) == NULL) {
2984 DEBUG(0,("get_nt_acl: Unable to malloc space for acl.\n"));
2985 goto done;
2986 }
2987 }
2988 } /* security_info & DACL_SECURITY_INFORMATION */
2989
2990 psd = make_standard_sec_desc( main_loop_talloc_get(),
2991 (security_info & OWNER_SECURITY_INFORMATION) ? &owner_sid : NULL,
2992 (security_info & GROUP_SECURITY_INFORMATION) ? &group_sid : NULL,
2993 psa,
2994 &sd_size);
2995
2996 if(!psd) {
2997 DEBUG(0,("get_nt_acl: Unable to malloc space for security descriptor.\n"));
2998 sd_size = 0;
2999 goto done;
3000 }
3001
3002 /*
3003 * Windows 2000: The DACL_PROTECTED flag in the security
3004 * descriptor marks the ACL as non-inheriting, i.e., no
3005 * ACEs from higher level directories propagate to this
3006 * ACL. In the POSIX ACL model permissions are only
3007 * inherited at file create time, so ACLs never contain
3008 * any ACEs that are inherited dynamically. The DACL_PROTECTED
3009 * flag doesn't seem to bother Windows NT.
3010 * Always set this if map acl inherit is turned off.
3011 */
3012 if (get_protected_flag(pal) || !lp_map_acl_inherit(SNUM(conn))) {
3013 psd->type |= SE_DESC_DACL_PROTECTED;
3014 }
3015
3016 if (psd->dacl) {
3017 dacl_sort_into_canonical_order(psd->dacl->aces, (unsigned int)psd->dacl->num_aces);
3018 }
3019
3020 *ppdesc = psd;
3021
3022 done:
3023
3024 if (posix_acl) {
3025 SMB_VFS_SYS_ACL_FREE_ACL(conn, posix_acl);
3026 }
3027 if (def_acl) {
3028 SMB_VFS_SYS_ACL_FREE_ACL(conn, def_acl);
3029 }
3030 free_canon_ace_list(file_ace);
3031 free_canon_ace_list(dir_ace);
3032 free_inherited_info(pal);
3033 SAFE_FREE(nt_ace_list);
3034
3035 return sd_size;
3036 }
3037
3038 /****************************************************************************
3039 Try to chown a file. We will be able to chown it under the following conditions.
3040
3041 1) If we have root privileges, then it will just work.
3042 2) If we have SeTakeOwnershipPrivilege we can change the user to the current user.
3043 3) If we have SeRestorePrivilege we can change the user to any other user.
3044 4) If we have write permission to the file and dos_filemodes is set
3045 then allow chown to the currently authenticated user.
3046 ****************************************************************************/
3047
3048 int try_chown(connection_struct *conn, const char *fname, uid_t uid, gid_t gid)
3049 {
3050 int ret;
3051 files_struct *fsp;
3052 SMB_STRUCT_STAT st;
3053
3054 if(!CAN_WRITE(conn)) {
3055 return -1;
3056 }
3057
3058 /* Case (1). */
3059 /* try the direct way first */
3060 ret = SMB_VFS_CHOWN(conn, fname, uid, gid);
3061 if (ret == 0)
3062 return 0;
3063
3064 /* Case (2) / (3) */
3065 if (lp_enable_privileges()) {
3066
3067 BOOL has_take_ownership_priv = user_has_privileges(current_user.nt_user_token,
3068 &se_take_ownership);
3069 BOOL has_restore_priv = user_has_privileges(current_user.nt_user_token,
3070 &se_restore);
3071
3072 /* Case (2) */
3073 if ( ( has_take_ownership_priv && ( uid == current_user.ut.uid ) ) ||
3074 /* Case (3) */
3075 ( has_restore_priv ) ) {
3076
3077 become_root();
3078 /* Keep the current file gid the same - take ownership doesn't imply group change. */
3079 ret = SMB_VFS_CHOWN(conn, fname, uid, (gid_t)-1);
3080 unbecome_root();
3081 return ret;
3082 }
3083 }
3084
3085 /* Case (4). */
3086 if (!lp_dos_filemode(SNUM(conn))) {
3087 return -1;
3088 }
3089
3090 if (SMB_VFS_STAT(conn,fname,&st)) {
3091 return -1;
3092 }
3093
3094 if (!NT_STATUS_IS_OK(open_file_fchmod(conn,fname,&st,&fsp))) {
3095 return -1;
3096 }
3097
3098 /* only allow chown to the current user. This is more secure,
3099 and also copes with the case where the SID in a take ownership ACL is
3100 a local SID on the users workstation
3101 */
3102 uid = current_user.ut.uid;
3103
3104 become_root();
3105 /* Keep the current file gid the same. */
3106 ret = SMB_VFS_FCHOWN(fsp, fsp->fh->fd, uid, (gid_t)-1);
3107 unbecome_root();
3108
3109 close_file_fchmod(fsp);
3110
3111 return ret;
3112 }
3113
3114 /****************************************************************************
3115 Take care of parent ACL inheritance.
3116 ****************************************************************************/
3117
3118 static NTSTATUS append_parent_acl(files_struct *fsp,
3119 SMB_STRUCT_STAT *psbuf,
3120 SEC_DESC *psd,
3121 SEC_DESC **pp_new_sd)
3122 {
3123 SEC_DESC *parent_sd = NULL;
3124 files_struct *parent_fsp = NULL;
3125 TALLOC_CTX *mem_ctx = talloc_parent(psd);
3126 char *parent_name = NULL;
3127 SEC_ACE *new_ace = NULL;
3128 unsigned int num_aces = psd->dacl->num_aces;
3129 SMB_STRUCT_STAT sbuf;
3130 NTSTATUS status;
3131 int info;
3132 size_t sd_size;
3133 unsigned int i, j;
3134 BOOL is_dacl_protected = (psd->type & SE_DESC_DACL_PROTECTED);
3135
3136 ZERO_STRUCT(sbuf);
3137
3138 if (mem_ctx == NULL) {
3139 return NT_STATUS_NO_MEMORY;
3140 }
3141
3142 if (!parent_dirname_talloc(mem_ctx,
3143 fsp->fsp_name,
3144 &parent_name,
3145 NULL)) {
3146 return NT_STATUS_NO_MEMORY;
3147 }
3148
3149 status = open_directory(fsp->conn,
3150 parent_name,
3151 &sbuf,
3152 FILE_READ_ATTRIBUTES, /* Just a stat open */
3153 FILE_SHARE_NONE, /* Ignored for stat opens */
3154 FILE_OPEN,
3155 0,
3156 0,
3157 &info,
3158 &parent_fsp);
3159
3160 if (!NT_STATUS_IS_OK(status)) {
3161 return status;
3162 }
3163
3164 sd_size = SMB_VFS_GET_NT_ACL(parent_fsp, parent_fsp->fsp_name,
3165 DACL_SECURITY_INFORMATION, &parent_sd );
3166
3167 close_file(parent_fsp, NORMAL_CLOSE);
3168
3169 if (!sd_size) {
3170 return NT_STATUS_ACCESS_DENIED;
3171 }
3172
3173 /*
3174 * Make room for potentially all the ACLs from
3175 * the parent. We used to add the ugw triple here,
3176 * as we knew we were dealing with POSIX ACLs.
3177 * We no longer need to do so as we can guarentee
3178 * that a default ACL from the parent directory will
3179 * be well formed for POSIX ACLs if it came from a
3180 * POSIX ACL source, and if we're not writing to a
3181 * POSIX ACL sink then we don't care if it's not well
3182 * formed. JRA.
3183 */
3184
3185 num_aces += parent_sd->dacl->num_aces;
3186
3187 if((new_ace = TALLOC_ZERO_ARRAY(mem_ctx, SEC_ACE,
3188 num_aces)) == NULL) {
3189 return NT_STATUS_NO_MEMORY;
3190 }
3191
3192 /* Start by copying in all the given ACE entries. */
3193 for (i = 0; i < psd->dacl->num_aces; i++) {
3194 sec_ace_copy(&new_ace[i], &psd->dacl->aces[i]);
3195 }
3196
3197 /*
3198 * Note that we're ignoring "inherit permissions" here
3199 * as that really only applies to newly created files. JRA.
3200 */
3201
3202 /* Finally append any inherited ACEs. */
3203 for (j = 0; j < parent_sd->dacl->num_aces; j++) {
3204 SEC_ACE *se = &parent_sd->dacl->aces[j];
3205
3206 if (fsp->is_directory) {
3207 if (!(se->flags & SEC_ACE_FLAG_CONTAINER_INHERIT)) {
3208 /* Doesn't apply to a directory - ignore. */
3209 DEBUG(10,("append_parent_acl: directory %s "
3210 "ignoring non container "
3211 "inherit flags %u on ACE with sid %s "
3212 "from parent %s\n",
3213 fsp->fsp_name,
3214 (unsigned int)se->flags,
3215 sid_string_static(&se->trustee),
3216 parent_name));
3217 continue;
3218 }
3219 } else {
3220 if (!(se->flags & SEC_ACE_FLAG_OBJECT_INHERIT)) {
3221 /* Doesn't apply to a file - ignore. */
3222 DEBUG(10,("append_parent_acl: file %s "
3223 "ignoring non object "
3224 "inherit flags %u on ACE with sid %s "
3225 "from parent %s\n",
3226 fsp->fsp_name,
3227 (unsigned int)se->flags,
3228 sid_string_static(&se->trustee),
3229 parent_name));
3230 continue;
3231 }
3232 }
3233
3234 if (is_dacl_protected) {
3235 /* If the DACL is protected it means we must
3236 * not overwrite an existing ACE entry with the
3237 * same SID. This is order N^2. Ouch :-(. JRA. */
3238 unsigned int k;
3239 for (k = 0; k < psd->dacl->num_aces; k++) {
3240 if (sid_equal(&psd->dacl->aces[k].trustee,
3241 &se->trustee)) {
3242 break;
3243 }
3244 }
3245 if (k < psd->dacl->num_aces) {
3246 /* SID matched. Ignore. */
3247 DEBUG(10,("append_parent_acl: path %s "
3248 "ignoring ACE with protected sid %s "
3249 "from parent %s\n",
3250 fsp->fsp_name,
3251 sid_string_static(&se->trustee),
3252 parent_name));
3253 continue;
3254 }
3255 }
3256
3257 sec_ace_copy(&new_ace[i], se);
3258 if (se->flags & SEC_ACE_FLAG_NO_PROPAGATE_INHERIT) {
3259 new_ace[i].flags &= ~(SEC_ACE_FLAG_VALID_INHERIT);
3260 }
3261 new_ace[i].flags |= SEC_ACE_FLAG_INHERITED_ACE;
3262
3263 if (fsp->is_directory) {
3264 /*
3265 * Strip off any inherit only. It's applied.
3266 */
3267 new_ace[i].flags &= ~(SEC_ACE_FLAG_INHERIT_ONLY);
3268 if (se->flags & SEC_ACE_FLAG_NO_PROPAGATE_INHERIT) {
3269 /* No further inheritance. */
3270 new_ace[i].flags &=
3271 ~(SEC_ACE_FLAG_CONTAINER_INHERIT|
3272 SEC_ACE_FLAG_OBJECT_INHERIT);
3273 }
3274 } else {
3275 /*
3276 * Strip off any container or inherit
3277 * flags, they can't apply to objects.
3278 */
3279 new_ace[i].flags &= ~(SEC_ACE_FLAG_CONTAINER_INHERIT|
3280 SEC_ACE_FLAG_INHERIT_ONLY|
3281 SEC_ACE_FLAG_NO_PROPAGATE_INHERIT);
3282 }
3283
3284 i++;
3285
3286 DEBUG(10,("append_parent_acl: path %s "
3287 "inheriting ACE with sid %s "
3288 "from parent %s\n",
3289 fsp->fsp_name,
3290 sid_string_static(&se->trustee),
3291 parent_name));
3292
3293 }
3294
3295 parent_sd->dacl->aces = new_ace;
3296 parent_sd->dacl->num_aces = i;
3297
3298 *pp_new_sd = parent_sd;
3299 return status;
3300 }
3301
3302 /****************************************************************************
3303 Reply to set a security descriptor on an fsp. security_info_sent is the
3304 description of the following NT ACL.
3305 This should be the only external function needed for the UNIX style set ACL.
3306 ****************************************************************************/
3307
3308 BOOL set_nt_acl(files_struct *fsp, uint32 security_info_sent, SEC_DESC *psd)
3309 {
3310 connection_struct *conn = fsp->conn;
3311 uid_t user = (uid_t)-1;
3312 gid_t grp = (gid_t)-1;
3313 SMB_STRUCT_STAT sbuf;
3314 DOM_SID file_owner_sid;
3315 DOM_SID file_grp_sid;
3316 canon_ace *file_ace_list = NULL;
3317 canon_ace *dir_ace_list = NULL;
3318 BOOL acl_perms = False;
3319 mode_t orig_mode = (mode_t)0;
3320 uid_t orig_uid;
3321 gid_t orig_gid;
3322 BOOL need_chown = False;
3323
3324 DEBUG(10,("set_nt_acl: called for file %s\n", fsp->fsp_name ));
3325
3326 if (!CAN_WRITE(conn)) {
3327 DEBUG(10,("set acl rejected on read-only share\n"));
3328 return False;
3329 }
3330
3331 /*
3332 * Get the current state of the file.
3333 */
3334
3335 if(fsp->is_directory || fsp->fh->fd == -1) {
3336 if(SMB_VFS_STAT(fsp->conn,fsp->fsp_name, &sbuf) != 0)
3337 return False;
3338 } else {
3339 if(SMB_VFS_FSTAT(fsp,fsp->fh->fd,&sbuf) != 0)
3340 return False;
3341 }
3342
3343 /* Save the original elements we check against. */
3344 orig_mode = sbuf.st_mode;
3345 orig_uid = sbuf.st_uid;
3346 orig_gid = sbuf.st_gid;
3347
3348 /*
3349 * Unpack the user/group/world id's.
3350 */
3351
3352 if (!unpack_nt_owners( SNUM(conn), &user, &grp, security_info_sent, psd)) {
3353 return False;
3354 }
3355
3356 /*
3357 * Do we need to chown ?
3358 */
3359
3360 if (((user != (uid_t)-1) && (orig_uid != user)) || (( grp != (gid_t)-1) && (orig_gid != grp))) {
3361 need_chown = True;
3362 }
3363
3364 /*
3365 * Chown before setting ACL only if we don't change the user, or
3366 * if we change to the current user, but not if we want to give away
3367 * the file.
3368 */
3369
3370 if (need_chown && (user == (uid_t)-1 || user == current_user.ut.uid)) {
3371
3372 DEBUG(3,("set_nt_acl: chown %s. uid = %u, gid = %u.\n",
3373 fsp->fsp_name, (unsigned int)user, (unsigned int)grp ));
3374
3375 if(try_chown( fsp->conn, fsp->fsp_name, user, grp) == -1) {
3376 DEBUG(3,("set_nt_acl: chown %s, %u, %u failed. Error = %s.\n",
3377 fsp->fsp_name, (unsigned int)user, (unsigned int)grp, strerror(errno) ));
3378 return False;
3379 }
3380
3381 /*
3382 * Recheck the current state of the file, which may have changed.
3383 * (suid/sgid bits, for instance)
3384 */
3385
3386 if(fsp->is_directory) {
3387 if(SMB_VFS_STAT(fsp->conn, fsp->fsp_name, &sbuf) != 0) {
3388 return False;
3389 }
3390 } else {
3391
3392 int ret;
3393
3394 if(fsp->fh->fd == -1)
3395 ret = SMB_VFS_STAT(fsp->conn, fsp->fsp_name, &sbuf);
3396 else
3397 ret = SMB_VFS_FSTAT(fsp,fsp->fh->fd,&sbuf);
3398
3399 if(ret != 0)
3400 return False;
3401 }
3402
3403 /* Save the original elements we check against. */
3404 orig_mode = sbuf.st_mode;
3405 orig_uid = sbuf.st_uid;
3406 orig_gid = sbuf.st_gid;
3407
3408 /* We did it, don't try again */
3409 need_chown = False;
3410 }
3411
3412 create_file_sids(&sbuf, &file_owner_sid, &file_grp_sid);
3413
3414 if ((security_info_sent & DACL_SECURITY_INFORMATION) &&
3415 psd->dacl != NULL &&
3416 (psd->type & (SE_DESC_DACL_AUTO_INHERITED|
3417 SE_DESC_DACL_AUTO_INHERIT_REQ))==
3418 (SE_DESC_DACL_AUTO_INHERITED|
3419 SE_DESC_DACL_AUTO_INHERIT_REQ) ) {
3420 NTSTATUS status = append_parent_acl(fsp, &sbuf, psd, &psd);
3421 if (!NT_STATUS_IS_OK(status)) {
3422 return False;
3423 }
3424 }
3425
3426 acl_perms = unpack_canon_ace( fsp, &sbuf, &file_owner_sid, &file_grp_sid,
3427 &file_ace_list, &dir_ace_list, security_info_sent, psd);
3428
3429 /* Ignore W2K traverse DACL set. */
3430 if (file_ace_list || dir_ace_list) {
3431
3432 if (!acl_perms) {
3433 DEBUG(3,("set_nt_acl: cannot set permissions\n"));
3434 free_canon_ace_list(file_ace_list);
3435 free_canon_ace_list(dir_ace_list);
3436 return False;
3437 }
3438
3439 /*
3440 * Only change security if we got a DACL.
3441 */
3442
3443 if((security_info_sent & DACL_SECURITY_INFORMATION) && (psd->dacl != NULL)) {
3444
3445 BOOL acl_set_support = False;
3446 BOOL ret = False;
3447
3448 /*
3449 * Try using the POSIX ACL set first. Fall back to chmod if
3450 * we have no ACL support on this filesystem.
3451 */
3452
3453 if (acl_perms && file_ace_list) {
3454 ret = set_canon_ace_list(fsp, file_ace_list, False, sbuf.st_gid, &acl_set_support);
3455 if (acl_set_support && ret == False) {
3456 DEBUG(3,("set_nt_acl: failed to set file acl on file %s (%s).\n", fsp->fsp_name, strerror(errno) ));
3457 free_canon_ace_list(file_ace_list);
3458 free_canon_ace_list(dir_ace_list);
3459 return False;
3460 }
3461 }
3462
3463 if (acl_perms && acl_set_support && fsp->is_directory) {
3464 if (dir_ace_list) {
3465 if (!set_canon_ace_list(fsp, dir_ace_list, True, sbuf.st_gid, &acl_set_support)) {
3466 DEBUG(3,("set_nt_acl: failed to set default acl on directory %s (%s).\n", fsp->fsp_name, strerror(errno) ));
3467 free_canon_ace_list(file_ace_list);
3468 free_canon_ace_list(dir_ace_list);
3469 return False;
3470 }
3471 } else {
3472
3473 /*
3474 * No default ACL - delete one if it exists.
3475 */
3476
3477 if (SMB_VFS_SYS_ACL_DELETE_DEF_FILE(conn, fsp->fsp_name) == -1) {
3478 int sret = -1;
3479
3480 if (acl_group_override(conn, sbuf.st_gid)) {
3481 DEBUG(5,("set_nt_acl: acl group control on and "
3482 "current user in file %s primary group. Override delete_def_acl\n",
3483 fsp->fsp_name ));
3484
3485 become_root();
3486 sret = SMB_VFS_SYS_ACL_DELETE_DEF_FILE(conn, fsp->fsp_name);
3487 unbecome_root();
3488 }
3489
3490 if (sret == -1) {
3491 DEBUG(3,("set_nt_acl: sys_acl_delete_def_file failed (%s)\n", strerror(errno)));
3492 free_canon_ace_list(file_ace_list);
3493 free_canon_ace_list(dir_ace_list);
3494 return False;
3495 }
3496 }
3497 }
3498 }
3499
3500 if (acl_set_support) {
3501 store_inheritance_attributes(fsp, file_ace_list, dir_ace_list,
3502 (psd->type & SE_DESC_DACL_PROTECTED) ? True : False);
3503 }
3504
3505 /*
3506 * If we cannot set using POSIX ACLs we fall back to checking if we need to chmod.
3507 */
3508
3509 if(!acl_set_support && acl_perms) {
3510 mode_t posix_perms;
3511
3512 if (!convert_canon_ace_to_posix_perms( fsp, file_ace_list, &posix_perms)) {
3513 free_canon_ace_list(file_ace_list);
3514 free_canon_ace_list(dir_ace_list);
3515 DEBUG(3,("set_nt_acl: failed to convert file acl to posix permissions for file %s.\n",
3516 fsp->fsp_name ));
3517 return False;
3518 }
3519
3520 if (orig_mode != posix_perms) {
3521
3522 DEBUG(3,("set_nt_acl: chmod %s. perms = 0%o.\n",
3523 fsp->fsp_name, (unsigned int)posix_perms ));
3524
3525 if(SMB_VFS_CHMOD(conn,fsp->fsp_name, posix_perms) == -1) {
3526 int sret = -1;
3527 if (acl_group_override(conn, sbuf.st_gid)) {
3528 DEBUG(5,("set_nt_acl: acl group control on and "
3529 "current user in file %s primary group. Override chmod\n",
3530 fsp->fsp_name ));
3531
3532 become_root();
3533 sret = SMB_VFS_CHMOD(conn,fsp->fsp_name, posix_perms);
3534 unbecome_root();
3535 }
3536
3537 if (sret == -1) {
3538 DEBUG(3,("set_nt_acl: chmod %s, 0%o failed. Error = %s.\n",
3539 fsp->fsp_name, (unsigned int)posix_perms, strerror(errno) ));
3540 free_canon_ace_list(file_ace_list);
3541 free_canon_ace_list(dir_ace_list);
3542 return False;
3543 }
3544 }
3545 }
3546 }
3547 }
3548
3549 free_canon_ace_list(file_ace_list);
3550 free_canon_ace_list(dir_ace_list);
3551 }
3552
3553 /* Any chown pending? */
3554 if (need_chown) {
3555
3556 DEBUG(3,("set_nt_acl: chown %s. uid = %u, gid = %u.\n",
3557 fsp->fsp_name, (unsigned int)user, (unsigned int)grp ));
3558
3559 if(try_chown( fsp->conn, fsp->fsp_name, user, grp) == -1) {
3560 DEBUG(3,("set_nt_acl: chown %s, %u, %u failed. Error = %s.\n",
3561 fsp->fsp_name, (unsigned int)user, (unsigned int)grp, strerror(errno) ));
3562 return False;
3563 }
3564 }
3565
3566 return True;
3567 }
3568
3569 /****************************************************************************
3570 Get the actual group bits stored on a file with an ACL. Has no effect if
3571 the file has no ACL. Needed in dosmode code where the stat() will return
3572 the mask bits, not the real group bits, for a file with an ACL.
3573 ****************************************************************************/
3574
3575 int get_acl_group_bits( connection_struct *conn, const char *fname, mode_t *mode )
3576 {
3577 int entry_id = SMB_ACL_FIRST_ENTRY;
3578 SMB_ACL_ENTRY_T entry;
3579 SMB_ACL_T posix_acl;
3580 int result = -1;
3581
3582 posix_acl = SMB_VFS_SYS_ACL_GET_FILE(conn, fname, SMB_ACL_TYPE_ACCESS);
3583 if (posix_acl == (SMB_ACL_T)NULL)
3584 return -1;
3585
3586 while (SMB_VFS_SYS_ACL_GET_ENTRY(conn, posix_acl, entry_id, &entry) == 1) {
3587 SMB_ACL_TAG_T tagtype;
3588 SMB_ACL_PERMSET_T permset;
3589
3590 /* get_next... */
3591 if (entry_id == SMB_ACL_FIRST_ENTRY)
3592 entry_id = SMB_ACL_NEXT_ENTRY;
3593
3594 if (SMB_VFS_SYS_ACL_GET_TAG_TYPE(conn, entry, &tagtype) ==-1)
3595 break;
3596
3597 if (tagtype == SMB_ACL_GROUP_OBJ) {
3598 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, entry, &permset) == -1) {
3599 break;
3600 } else {
3601 *mode &= ~(S_IRGRP|S_IWGRP|S_IXGRP);
3602 *mode |= (SMB_VFS_SYS_ACL_GET_PERM(conn, permset, SMB_ACL_READ) ? S_IRGRP : 0);
3603 *mode |= (SMB_VFS_SYS_ACL_GET_PERM(conn, permset, SMB_ACL_WRITE) ? S_IWGRP : 0);
3604 *mode |= (SMB_VFS_SYS_ACL_GET_PERM(conn, permset, SMB_ACL_EXECUTE) ? S_IXGRP : 0);
3605 result = 0;
3606 break;
3607 }
3608 }
3609 }
3610 SMB_VFS_SYS_ACL_FREE_ACL(conn, posix_acl);
3611 return result;
3612 }
3613
3614 /****************************************************************************
3615 Do a chmod by setting the ACL USER_OBJ, GROUP_OBJ and OTHER bits in an ACL
3616 and set the mask to rwx. Needed to preserve complex ACLs set by NT.
3617 ****************************************************************************/
3618
3619 static int chmod_acl_internals( connection_struct *conn, SMB_ACL_T posix_acl, mode_t mode)
3620 {
3621 int entry_id = SMB_ACL_FIRST_ENTRY;
3622 SMB_ACL_ENTRY_T entry;
3623 int num_entries = 0;
3624
3625 while ( SMB_VFS_SYS_ACL_GET_ENTRY(conn, posix_acl, entry_id, &entry) == 1) {
3626 SMB_ACL_TAG_T tagtype;
3627 SMB_ACL_PERMSET_T permset;
3628 mode_t perms;
3629
3630 /* get_next... */
3631 if (entry_id == SMB_ACL_FIRST_ENTRY)
3632 entry_id = SMB_ACL_NEXT_ENTRY;
3633
3634 if (SMB_VFS_SYS_ACL_GET_TAG_TYPE(conn, entry, &tagtype) == -1)
3635 return -1;
3636
3637 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, entry, &permset) == -1)
3638 return -1;
3639
3640 num_entries++;
3641
3642 switch(tagtype) {
3643 case SMB_ACL_USER_OBJ:
3644 perms = unix_perms_to_acl_perms(mode, S_IRUSR, S_IWUSR, S_IXUSR);
3645 break;
3646 case SMB_ACL_GROUP_OBJ:
3647 perms = unix_perms_to_acl_perms(mode, S_IRGRP, S_IWGRP, S_IXGRP);
3648 break;
3649 case SMB_ACL_MASK:
3650 /*
3651 * FIXME: The ACL_MASK entry permissions should really be set to
3652 * the union of the permissions of all ACL_USER,
3653 * ACL_GROUP_OBJ, and ACL_GROUP entries. That's what
3654 * acl_calc_mask() does, but Samba ACLs doesn't provide it.
3655 */
3656 perms = S_IRUSR|S_IWUSR|S_IXUSR;
3657 break;
3658 case SMB_ACL_OTHER:
3659 perms = unix_perms_to_acl_perms(mode, S_IROTH, S_IWOTH, S_IXOTH);
3660 break;
3661 default:
3662 continue;
3663 }
3664
3665 if (map_acl_perms_to_permset(conn, perms, &permset) == -1)
3666 return -1;
3667
3668 if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, entry, permset) == -1)
3669 return -1;
3670 }
3671
3672 /*
3673 * If this is a simple 3 element ACL or no elements then it's a standard
3674 * UNIX permission set. Just use chmod...
3675 */
3676
3677 if ((num_entries == 3) || (num_entries == 0))
3678 return -1;
3679
3680 return 0;
3681 }
3682
3683 /****************************************************************************
3684 Get the access ACL of FROM, do a chmod by setting the ACL USER_OBJ,
3685 GROUP_OBJ and OTHER bits in an ACL and set the mask to rwx. Set the
3686 resulting ACL on TO. Note that name is in UNIX character set.
3687 ****************************************************************************/
3688
3689 static int copy_access_acl(connection_struct *conn, const char *from, const char *to, mode_t mode)
3690 {
3691 SMB_ACL_T posix_acl = NULL;
3692 int ret = -1;
3693
3694 if ((posix_acl = SMB_VFS_SYS_ACL_GET_FILE(conn, from, SMB_ACL_TYPE_ACCESS)) == NULL)
3695 return -1;
3696
3697 if ((ret = chmod_acl_internals(conn, posix_acl, mode)) == -1)
3698 goto done;
3699
3700 ret = SMB_VFS_SYS_ACL_SET_FILE(conn, to, SMB_ACL_TYPE_ACCESS, posix_acl);
3701
3702 done:
3703
3704 SMB_VFS_SYS_ACL_FREE_ACL(conn, posix_acl);
3705 return ret;
3706 }
3707
3708 /****************************************************************************
3709 Do a chmod by setting the ACL USER_OBJ, GROUP_OBJ and OTHER bits in an ACL
3710 and set the mask to rwx. Needed to preserve complex ACLs set by NT.
3711 Note that name is in UNIX character set.
3712 ****************************************************************************/
3713
3714 int chmod_acl(connection_struct *conn, const char *name, mode_t mode)
3715 {
3716 return copy_access_acl(conn, name, name, mode);
3717 }
3718
3719 /****************************************************************************
3720 If the parent directory has no default ACL but it does have an Access ACL,
3721 inherit this Access ACL to file name.
3722 ****************************************************************************/
3723
3724 int inherit_access_acl(connection_struct *conn, const char *inherit_from_dir,
3725 const char *name, mode_t mode)
3726 {
3727 if (directory_has_default_acl(conn, inherit_from_dir))
3728 return 0;
3729
3730 return copy_access_acl(conn, inherit_from_dir, name, mode);
3731 }
3732
3733 /****************************************************************************
3734 Do an fchmod by setting the ACL USER_OBJ, GROUP_OBJ and OTHER bits in an ACL
3735 and set the mask to rwx. Needed to preserve complex ACLs set by NT.
3736 ****************************************************************************/
3737
3738 int fchmod_acl(files_struct *fsp, int fd, mode_t mode)
3739 {
3740 connection_struct *conn = fsp->conn;
3741 SMB_ACL_T posix_acl = NULL;
3742 int ret = -1;
3743
3744 if ((posix_acl = SMB_VFS_SYS_ACL_GET_FD(fsp, fd)) == NULL)
3745 return -1;
3746
3747 if ((ret = chmod_acl_internals(conn, posix_acl, mode)) == -1)
3748 goto done;
3749
3750 ret = SMB_VFS_SYS_ACL_SET_FD(fsp, fd, posix_acl);
3751
3752 done:
3753
3754 SMB_VFS_SYS_ACL_FREE_ACL(conn, posix_acl);
3755 return ret;
3756 }
3757
3758 /****************************************************************************
3759 Check for an existing default POSIX ACL on a directory.
3760 ****************************************************************************/
3761
3762 BOOL directory_has_default_acl(connection_struct *conn, const char *fname)
3763 {
3764 SMB_ACL_T def_acl = SMB_VFS_SYS_ACL_GET_FILE( conn, fname, SMB_ACL_TYPE_DEFAULT);
3765 BOOL has_acl = False;
3766 SMB_ACL_ENTRY_T entry;
3767
3768 if (def_acl != NULL && (SMB_VFS_SYS_ACL_GET_ENTRY(conn, def_acl, SMB_ACL_FIRST_ENTRY, &entry) == 1)) {
3769 has_acl = True;
3770 }
3771
3772 if (def_acl) {
3773 SMB_VFS_SYS_ACL_FREE_ACL(conn, def_acl);
3774 }
3775 return has_acl;
3776 }
3777
3778 /****************************************************************************
3779 Map from wire type to permset.
3780 ****************************************************************************/
3781
3782 static BOOL unix_ex_wire_to_permset(connection_struct *conn, unsigned char wire_perm, SMB_ACL_PERMSET_T *p_permset)
3783 {
3784 if (wire_perm & ~(SMB_POSIX_ACL_READ|SMB_POSIX_ACL_WRITE|SMB_POSIX_ACL_EXECUTE)) {
3785 return False;
3786 }
3787
3788 if (SMB_VFS_SYS_ACL_CLEAR_PERMS(conn, *p_permset) == -1) {
3789 return False;
3790 }
3791
3792 if (wire_perm & SMB_POSIX_ACL_READ) {
3793 if (SMB_VFS_SYS_ACL_ADD_PERM(conn, *p_permset, SMB_ACL_READ) == -1) {
3794 return False;
3795 }
3796 }
3797 if (wire_perm & SMB_POSIX_ACL_WRITE) {
3798 if (SMB_VFS_SYS_ACL_ADD_PERM(conn, *p_permset, SMB_ACL_WRITE) == -1) {
3799 return False;
3800 }
3801 }
3802 if (wire_perm & SMB_POSIX_ACL_EXECUTE) {
3803 if (SMB_VFS_SYS_ACL_ADD_PERM(conn, *p_permset, SMB_ACL_EXECUTE) == -1) {
3804 return False;
3805 }
3806 }
3807 return True;
3808 }
3809
3810 /****************************************************************************
3811 Map from wire type to tagtype.
3812 ****************************************************************************/
3813
3814 static BOOL unix_ex_wire_to_tagtype(unsigned char wire_tt, SMB_ACL_TAG_T *p_tt)
3815 {
3816 switch (wire_tt) {
3817 case SMB_POSIX_ACL_USER_OBJ:
3818 *p_tt = SMB_ACL_USER_OBJ;
3819 break;
3820 case SMB_POSIX_ACL_USER:
3821 *p_tt = SMB_ACL_USER;
3822 break;
3823 case SMB_POSIX_ACL_GROUP_OBJ:
3824 *p_tt = SMB_ACL_GROUP_OBJ;
3825 break;
3826 case SMB_POSIX_ACL_GROUP:
3827 *p_tt = SMB_ACL_GROUP;
3828 break;
3829 case SMB_POSIX_ACL_MASK:
3830 *p_tt = SMB_ACL_MASK;
3831 break;
3832 case SMB_POSIX_ACL_OTHER:
3833 *p_tt = SMB_ACL_OTHER;
3834 break;
3835 default:
3836 return False;
3837 }
3838 return True;
3839 }
3840
3841 /****************************************************************************
3842 Create a new POSIX acl from wire permissions.
3843 FIXME ! How does the share mask/mode fit into this.... ?
3844 ****************************************************************************/
3845
3846 static SMB_ACL_T create_posix_acl_from_wire(connection_struct *conn, uint16 num_acls, const char *pdata)
3847 {
3848 unsigned int i;
3849 SMB_ACL_T the_acl = SMB_VFS_SYS_ACL_INIT(conn, num_acls);
3850
3851 if (the_acl == NULL) {
3852 return NULL;
3853 }
3854
3855 for (i = 0; i < num_acls; i++) {
3856 SMB_ACL_ENTRY_T the_entry;
3857 SMB_ACL_PERMSET_T the_permset;
3858 SMB_ACL_TAG_T tag_type;
3859
3860 if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &the_acl, &the_entry) == -1) {
3861 DEBUG(0,("create_posix_acl_from_wire: Failed to create entry %u. (%s)\n",
3862 i, strerror(errno) ));
3863 goto fail;
3864 }
3865
3866 if (!unix_ex_wire_to_tagtype(CVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)), &tag_type)) {
3867 DEBUG(0,("create_posix_acl_from_wire: invalid wire tagtype %u on entry %u.\n",
3868 CVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)), i ));
3869 goto fail;
3870 }
3871
3872 if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, the_entry, tag_type) == -1) {
3873 DEBUG(0,("create_posix_acl_from_wire: Failed to set tagtype on entry %u. (%s)\n",
3874 i, strerror(errno) ));
3875 goto fail;
3876 }
3877
3878 /* Get the permset pointer from the new ACL entry. */
3879 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, the_entry, &the_permset) == -1) {
3880 DEBUG(0,("create_posix_acl_from_wire: Failed to get permset on entry %u. (%s)\n",
3881 i, strerror(errno) ));
3882 goto fail;
3883 }
3884
3885 /* Map from wire to permissions. */
3886 if (!unix_ex_wire_to_permset(conn, CVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)+1), &the_permset)) {
3887 DEBUG(0,("create_posix_acl_from_wire: invalid permset %u on entry %u.\n",
3888 CVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE) + 1), i ));
3889 goto fail;
3890 }
3891
3892 /* Now apply to the new ACL entry. */
3893 if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, the_entry, the_permset) == -1) {
3894 DEBUG(0,("create_posix_acl_from_wire: Failed to add permset on entry %u. (%s)\n",
3895 i, strerror(errno) ));
3896 goto fail;
3897 }
3898
3899 if (tag_type == SMB_ACL_USER) {
3900 uint32 uidval = IVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)+2);
3901 uid_t uid = (uid_t)uidval;
3902 if (SMB_VFS_SYS_ACL_SET_QUALIFIER(conn, the_entry,(void *)&uid) == -1) {
3903 DEBUG(0,("create_posix_acl_from_wire: Failed to set uid %u on entry %u. (%s)\n",
3904 (unsigned int)uid, i, strerror(errno) ));
3905 goto fail;
3906 }
3907 }
3908
3909 if (tag_type == SMB_ACL_GROUP) {
3910 uint32 gidval = IVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)+2);
3911 gid_t gid = (uid_t)gidval;
3912 if (SMB_VFS_SYS_ACL_SET_QUALIFIER(conn, the_entry,(void *)&gid) == -1) {
3913 DEBUG(0,("create_posix_acl_from_wire: Failed to set gid %u on entry %u. (%s)\n",
3914 (unsigned int)gid, i, strerror(errno) ));
3915 goto fail;
3916 }
3917 }
3918 }
3919
3920 return the_acl;
3921
3922 fail:
3923
3924 if (the_acl != NULL) {
3925 SMB_VFS_SYS_ACL_FREE_ACL(conn, the_acl);
3926 }
3927 return NULL;
3928 }
3929
3930 /****************************************************************************
3931 Calls from UNIX extensions - Default POSIX ACL set.
3932 If num_def_acls == 0 and not a directory just return. If it is a directory
3933 and num_def_acls == 0 then remove the default acl. Else set the default acl
3934 on the directory.
3935 ****************************************************************************/
3936
3937 BOOL set_unix_posix_default_acl(connection_struct *conn, const char *fname, SMB_STRUCT_STAT *psbuf,
3938 uint16 num_def_acls, const char *pdata)
3939 {
3940 SMB_ACL_T def_acl = NULL;
3941
3942 if (num_def_acls && !S_ISDIR(psbuf->st_mode)) {
3943 DEBUG(5,("set_unix_posix_default_acl: Can't set default ACL on non-directory file %s\n", fname ));
3944 errno = EISDIR;
3945 return False;
3946 }
3947
3948 if (!num_def_acls) {
3949 /* Remove the default ACL. */
3950 if (SMB_VFS_SYS_ACL_DELETE_DEF_FILE(conn, fname) == -1) {
3951 DEBUG(5,("set_unix_posix_default_acl: acl_delete_def_file failed on directory %s (%s)\n",
3952 fname, strerror(errno) ));
3953 return False;
3954 }
3955 return True;
3956 }
3957
3958 if ((def_acl = create_posix_acl_from_wire(conn, num_def_acls, pdata)) == NULL) {
3959 return False;
3960 }
3961
3962 if (SMB_VFS_SYS_ACL_SET_FILE(conn, fname, SMB_ACL_TYPE_DEFAULT, def_acl) == -1) {
3963 DEBUG(5,("set_unix_posix_default_acl: acl_set_file failed on directory %s (%s)\n",
3964 fname, strerror(errno) ));
3965 SMB_VFS_SYS_ACL_FREE_ACL(conn, def_acl);
3966 return False;
3967 }
3968
3969 DEBUG(10,("set_unix_posix_default_acl: set default acl for file %s\n", fname ));
3970 SMB_VFS_SYS_ACL_FREE_ACL(conn, def_acl);
3971 return True;
3972 }
3973
3974 /****************************************************************************
3975 Remove an ACL from a file. As we don't have acl_delete_entry() available
3976 we must read the current acl and copy all entries except MASK, USER and GROUP
3977 to a new acl, then set that. This (at least on Linux) causes any ACL to be
3978 removed.
3979 FIXME ! How does the share mask/mode fit into this.... ?
3980 ****************************************************************************/
3981
3982 static BOOL remove_posix_acl(connection_struct *conn, files_struct *fsp, const char *fname)
3983 {
3984 SMB_ACL_T file_acl = NULL;
3985 int entry_id = SMB_ACL_FIRST_ENTRY;
3986 SMB_ACL_ENTRY_T entry;
3987 BOOL ret = False;
3988 /* Create a new ACL with only 3 entries, u/g/w. */
3989 SMB_ACL_T new_file_acl = SMB_VFS_SYS_ACL_INIT(conn, 3);
3990 SMB_ACL_ENTRY_T user_ent = NULL;
3991 SMB_ACL_ENTRY_T group_ent = NULL;
3992 SMB_ACL_ENTRY_T other_ent = NULL;
3993
3994 if (new_file_acl == NULL) {
3995 DEBUG(5,("remove_posix_acl: failed to init new ACL with 3 entries for file %s.\n", fname));
3996 return False;
3997 }
3998
3999 /* Now create the u/g/w entries. */
4000 if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &new_file_acl, &user_ent) == -1) {
4001 DEBUG(5,("remove_posix_acl: Failed to create user entry for file %s. (%s)\n",
4002 fname, strerror(errno) ));
4003 goto done;
4004 }
4005 if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, user_ent, SMB_ACL_USER_OBJ) == -1) {
4006 DEBUG(5,("remove_posix_acl: Failed to set user entry for file %s. (%s)\n",
4007 fname, strerror(errno) ));
4008 goto done;
4009 }
4010
4011 if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &new_file_acl, &group_ent) == -1) {
4012 DEBUG(5,("remove_posix_acl: Failed to create group entry for file %s. (%s)\n",
4013 fname, strerror(errno) ));
4014 goto done;
4015 }
4016 if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, group_ent, SMB_ACL_GROUP_OBJ) == -1) {
4017 DEBUG(5,("remove_posix_acl: Failed to set group entry for file %s. (%s)\n",
4018 fname, strerror(errno) ));
4019 goto done;
4020 }
4021
4022 if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &new_file_acl, &other_ent) == -1) {
4023 DEBUG(5,("remove_posix_acl: Failed to create other entry for file %s. (%s)\n",
4024 fname, strerror(errno) ));
4025 goto done;
4026 }
4027 if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, other_ent, SMB_ACL_OTHER) == -1) {
4028 DEBUG(5,("remove_posix_acl: Failed to set other entry for file %s. (%s)\n",
4029 fname, strerror(errno) ));
4030 goto done;
4031 }
4032
4033 /* Get the current file ACL. */
4034 if (fsp && fsp->fh->fd != -1) {
4035 file_acl = SMB_VFS_SYS_ACL_GET_FD(fsp, fsp->fh->fd);
4036 } else {
4037 file_acl = SMB_VFS_SYS_ACL_GET_FILE( conn, fname, SMB_ACL_TYPE_ACCESS);
4038 }
4039
4040 if (file_acl == NULL) {
4041 /* This is only returned if an error occurred. Even for a file with
4042 no acl a u/g/w acl should be returned. */
4043 DEBUG(5,("remove_posix_acl: failed to get ACL from file %s (%s).\n",
4044 fname, strerror(errno) ));
4045 goto done;
4046 }
4047
4048 while ( SMB_VFS_SYS_ACL_GET_ENTRY(conn, file_acl, entry_id, &entry) == 1) {
4049 SMB_ACL_TAG_T tagtype;
4050 SMB_ACL_PERMSET_T permset;
4051
4052 /* get_next... */
4053 if (entry_id == SMB_ACL_FIRST_ENTRY)
4054 entry_id = SMB_ACL_NEXT_ENTRY;
4055
4056 if (SMB_VFS_SYS_ACL_GET_TAG_TYPE(conn, entry, &tagtype) == -1) {
4057 DEBUG(5,("remove_posix_acl: failed to get tagtype from ACL on file %s (%s).\n",
4058 fname, strerror(errno) ));
4059 goto done;
4060 }
4061
4062 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, entry, &permset) == -1) {
4063 DEBUG(5,("remove_posix_acl: failed to get permset from ACL on file %s (%s).\n",
4064 fname, strerror(errno) ));
4065 goto done;
4066 }
4067
4068 if (tagtype == SMB_ACL_USER_OBJ) {
4069 if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, user_ent, permset) == -1) {
4070 DEBUG(5,("remove_posix_acl: failed to set permset from ACL on file %s (%s).\n",
4071 fname, strerror(errno) ));
4072 }
4073 } else if (tagtype == SMB_ACL_GROUP_OBJ) {
4074 if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, group_ent, permset) == -1) {
4075 DEBUG(5,("remove_posix_acl: failed to set permset from ACL on file %s (%s).\n",
4076 fname, strerror(errno) ));
4077 }
4078 } else if (tagtype == SMB_ACL_OTHER) {
4079 if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, other_ent, permset) == -1) {
4080 DEBUG(5,("remove_posix_acl: failed to set permset from ACL on file %s (%s).\n",
4081 fname, strerror(errno) ));
4082 }
4083 }
4084 }
4085
4086 /* Set the new empty file ACL. */
4087 if (fsp && fsp->fh->fd != -1) {
4088 if (SMB_VFS_SYS_ACL_SET_FD(fsp, fsp->fh->fd, new_file_acl) == -1) {
4089 DEBUG(5,("remove_posix_acl: acl_set_file failed on %s (%s)\n",
4090 fname, strerror(errno) ));
4091 goto done;
4092 }
4093 } else {
4094 if (SMB_VFS_SYS_ACL_SET_FILE(conn, fname, SMB_ACL_TYPE_ACCESS, new_file_acl) == -1) {
4095 DEBUG(5,("remove_posix_acl: acl_set_file failed on %s (%s)\n",
4096 fname, strerror(errno) ));
4097 goto done;
4098 }
4099 }
4100
4101 ret = True;
4102
4103 done:
4104
4105 if (file_acl) {
4106 SMB_VFS_SYS_ACL_FREE_ACL(conn, file_acl);
4107 }
4108 if (new_file_acl) {
4109 SMB_VFS_SYS_ACL_FREE_ACL(conn, new_file_acl);
4110 }
4111 return ret;
4112 }
4113
4114 /****************************************************************************
4115 Calls from UNIX extensions - POSIX ACL set.
4116 If num_def_acls == 0 then read/modify/write acl after removing all entries
4117 except SMB_ACL_USER_OBJ, SMB_ACL_GROUP_OBJ, SMB_ACL_OTHER.
4118 ****************************************************************************/
4119
4120 BOOL set_unix_posix_acl(connection_struct *conn, files_struct *fsp, const char *fname, uint16 num_acls, const char *pdata)
4121 {
4122 SMB_ACL_T file_acl = NULL;
4123
4124 if (!num_acls) {
4125 /* Remove the ACL from the file. */
4126 return remove_posix_acl(conn, fsp, fname);
4127 }
4128
4129 if ((file_acl = create_posix_acl_from_wire(conn, num_acls, pdata)) == NULL) {
4130 return False;
4131 }
4132
4133 if (fsp && fsp->fh->fd != -1) {
4134 /* The preferred way - use an open fd. */
4135 if (SMB_VFS_SYS_ACL_SET_FD(fsp, fsp->fh->fd, file_acl) == -1) {
4136 DEBUG(5,("set_unix_posix_acl: acl_set_file failed on %s (%s)\n",
4137 fname, strerror(errno) ));
4138 SMB_VFS_SYS_ACL_FREE_ACL(conn, file_acl);
4139 return False;
4140 }
4141 } else {
4142 if (SMB_VFS_SYS_ACL_SET_FILE(conn, fname, SMB_ACL_TYPE_ACCESS, file_acl) == -1) {
4143 DEBUG(5,("set_unix_posix_acl: acl_set_file failed on %s (%s)\n",
4144 fname, strerror(errno) ));
4145 SMB_VFS_SYS_ACL_FREE_ACL(conn, file_acl);
4146 return False;
4147 }
4148 }
4149
4150 DEBUG(10,("set_unix_posix_acl: set acl for file %s\n", fname ));
4151 SMB_VFS_SYS_ACL_FREE_ACL(conn, file_acl);
4152 return True;
4153 }
4154
4155 /****************************************************************************
4156 Helper function that gets a security descriptor by connection and
4157 file name.
4158 NOTE: This is transitional, in the sense that SMB_VFS_GET_NT_ACL really
4159 should *not* get a files_struct pointer but a connection_struct ptr
4160 (automatic by the vfs handle) and the file name and _use_ that!
4161 ****************************************************************************/
4162 static NTSTATUS conn_get_nt_acl(TALLOC_CTX *mem_ctx,
4163 struct connection_struct *conn,
4164 const char *fname,
4165 SMB_STRUCT_STAT *psbuf,
4166 struct security_descriptor_info **psd)
4167 {
4168 NTSTATUS status;
4169 struct files_struct *fsp = NULL;
4170 struct security_descriptor_info *secdesc = NULL;
4171 size_t secdesc_size;
4172
4173 if (!VALID_STAT(*psbuf)) {
4174 if (SMB_VFS_STAT(conn, fname, psbuf) != 0) {
4175 return map_nt_error_from_unix(errno);
4176 }
4177 }
4178
4179 /* fake a files_struct ptr: */
4180
4181 if (S_ISDIR(psbuf->st_mode)) {
4182 status = open_directory(conn, fname, psbuf,
4183 READ_CONTROL_ACCESS,
4184 FILE_SHARE_READ|FILE_SHARE_WRITE,
4185 FILE_OPEN,
4186 0,
4187 FILE_ATTRIBUTE_DIRECTORY,
4188 NULL, &fsp);
4189 }
4190 else {
4191 status = open_file_stat(conn, fname, psbuf, &fsp);
4192 }
4193
4194 if (!NT_STATUS_IS_OK(status)) {
4195 DEBUG(3, ("Unable to open file %s: %s\n", fname,
4196 nt_errstr(status)));
4197 return status;
4198 }
4199
4200 secdesc_size = SMB_VFS_GET_NT_ACL(fsp, fname,
4201 (OWNER_SECURITY_INFORMATION |
4202 GROUP_SECURITY_INFORMATION |
4203 DACL_SECURITY_INFORMATION),
4204 &secdesc);
4205 if (secdesc_size == 0) {
4206 DEBUG(5, ("Unable to get NT ACL for file %s\n", fname));
4207 status = NT_STATUS_ACCESS_DENIED;
4208 goto done;
4209 }
4210
4211 *psd = talloc_move(mem_ctx, &secdesc);
4212 status = NT_STATUS_OK;
4213
4214 done:
4215 close_file(fsp, NORMAL_CLOSE);
4216 return status;
4217 }
4218
4219 static BOOL can_access_file_acl(struct connection_struct *conn,
4220 const char * fname, SMB_STRUCT_STAT *psbuf,
4221 uint32_t access_mask)
4222 {
4223 BOOL result;
4224 NTSTATUS status;
4225 uint32_t access_granted;
4226 struct security_descriptor_info *secdesc = NULL;
4227
4228 status = conn_get_nt_acl(tmp_talloc_ctx(), conn, fname, psbuf, &secdesc);
4229 if (!NT_STATUS_IS_OK(status)) {
4230 DEBUG(5, ("Could not get acl: %s\n", nt_errstr(status)));
4231 return False;
4232 }
4233
4234 result = se_access_check(secdesc, current_user.nt_user_token,
4235 access_mask, &access_granted, &status);
4236 TALLOC_FREE(secdesc);
4237 return result;
4238 }
4239
4240 /****************************************************************************
4241 Actually emulate the in-kernel access checking for delete access. We need
4242 this to successfully return ACCESS_DENIED on a file open for delete access.
4243 ****************************************************************************/
4244
4245 BOOL can_delete_file_in_directory(connection_struct *conn, const char *fname)
4246 {
4247 SMB_STRUCT_STAT sbuf;
4248 pstring dname;
4249
4250 if (!CAN_WRITE(conn)) {
4251 return False;
4252 }
4253
4254 /* Get the parent directory permission mask and owners. */
4255 pstrcpy(dname, parent_dirname(fname));
4256 if(SMB_VFS_STAT(conn, dname, &sbuf) != 0) {
4257 return False;
4258 }
4259
4260 /* fast paths first */
4261
4262 if (!S_ISDIR(sbuf.st_mode)) {
4263 return False;
4264 }
4265 if (current_user.ut.uid == 0 || conn->admin_user) {
4266 /* I'm sorry sir, I didn't know you were root... */
4267 return True;
4268 }
4269
4270 /* Check primary owner write access. */
4271 if (current_user.ut.uid == sbuf.st_uid) {
4272 return (sbuf.st_mode & S_IWUSR) ? True : False;
4273 }
4274
4275 #ifdef S_ISVTX
4276 /* sticky bit means delete only by owner or root. */
4277 if (sbuf.st_mode & S_ISVTX) {
4278 SMB_STRUCT_STAT sbuf_file;
4279 if(SMB_VFS_STAT(conn, fname, &sbuf_file) != 0) {
4280 if (errno == ENOENT) {
4281 /* If the file doesn't already exist then
4282 * yes we'll be able to delete it. */
4283 return True;
4284 }
4285 return False;
4286 }
4287 /*
4288 * Patch from SATOH Fumiyasu <fumiyas@miraclelinux.com>
4289 * for bug #3348. Don't assume owning sticky bit
4290 * directory means write access allowed.
4291 */
4292 if (current_user.ut.uid != sbuf_file.st_uid) {
4293 return False;
4294 }
4295 }
4296 #endif
4297
4298 /* now for ACL checks */
4299
4300 return can_access_file_acl(conn, dname, &sbuf, FILE_WRITE_DATA);
4301 }
4302
4303 /****************************************************************************
4304 Actually emulate the in-kernel access checking for read/write access. We need
4305 this to successfully check for ability to write for dos filetimes.
4306 Note this doesn't take into account share write permissions.
4307 ****************************************************************************/
4308
4309 BOOL can_access_file(connection_struct *conn, const char *fname, SMB_STRUCT_STAT *psbuf, uint32 access_mask)
4310 {
4311 if (!(access_mask & (FILE_READ_DATA|FILE_WRITE_DATA))) {
4312 return False;
4313 }
4314 access_mask &= (FILE_READ_DATA|FILE_WRITE_DATA);
4315
4316 /* some fast paths first */
4317
4318 DEBUG(10,("can_access_file: requesting 0x%x on file %s\n",
4319 (unsigned int)access_mask, fname ));
4320
4321 if (current_user.ut.uid == 0 || conn->admin_user) {
4322 /* I'm sorry sir, I didn't know you were root... */
4323 return True;
4324 }
4325
4326 if (!VALID_STAT(*psbuf)) {
4327 /* Get the file permission mask and owners. */
4328 if(SMB_VFS_STAT(conn, fname, psbuf) != 0) {
4329 return False;
4330 }
4331 }
4332
4333 /* Check primary owner access. */
4334 if (current_user.ut.uid == psbuf->st_uid) {
4335 switch (access_mask) {
4336 case FILE_READ_DATA:
4337 return (psbuf->st_mode & S_IRUSR) ? True : False;
4338
4339 case FILE_WRITE_DATA:
4340 return (psbuf->st_mode & S_IWUSR) ? True : False;
4341
4342 default: /* FILE_READ_DATA|FILE_WRITE_DATA */
4343
4344 if ((psbuf->st_mode & (S_IWUSR|S_IRUSR)) == (S_IWUSR|S_IRUSR)) {
4345 return True;
4346 } else {
4347 return False;
4348 }
4349 }
4350 }
4351
4352 /* now for ACL checks */
4353
4354 return can_access_file_acl(conn, fname, psbuf, access_mask);
4355 }
4356
4357 /****************************************************************************
4358 Userspace check for write access.
4359 Note this doesn't take into account share write permissions.
4360 ****************************************************************************/
4361
4362 BOOL can_write_to_file(connection_struct *conn, const char *fname, SMB_STRUCT_STAT *psbuf)
4363 {
4364 return can_access_file(conn, fname, psbuf, FILE_WRITE_DATA);
4365 }
4366
4367 /********************************************************************
4368 Pull the NT ACL from a file on disk or the OpenEventlog() access
4369 check. Caller is responsible for freeing the returned security
4370 descriptor via TALLOC_FREE(). This is designed for dealing with
4371 user space access checks in smbd outside of the VFS. For example,
4372 checking access rights in OpenEventlog().
4373
4374 Assume we are dealing with files (for now)
4375 ********************************************************************/
4376
4377 SEC_DESC* get_nt_acl_no_snum( TALLOC_CTX *ctx, const char *fname)
4378 {
4379 SEC_DESC *psd, *ret_sd;
4380 connection_struct conn;
4381 files_struct finfo;
4382 struct fd_handle fh;
4383 pstring path;
4384 pstring filename;
4385
4386 ZERO_STRUCT( conn );
4387
4388 if ( !(conn.mem_ctx = talloc_init( "novfs_get_nt_acl" )) ) {
4389 DEBUG(0,("get_nt_acl_no_snum: talloc() failed!\n"));
4390 return NULL;
4391 }
4392
4393 if (!(conn.params = TALLOC_P(conn.mem_ctx, struct share_params))) {
4394 DEBUG(0,("get_nt_acl_no_snum: talloc() failed!\n"));
4395 TALLOC_FREE(conn.mem_ctx);
4396 return NULL;
4397 }
4398
4399 conn.params->service = -1;
4400
4401 pstrcpy( path, "/" );
4402 set_conn_connectpath(&conn, path);
4403
4404 if (!smbd_vfs_init(&conn)) {
4405 DEBUG(0,("get_nt_acl_no_snum: Unable to create a fake connection struct!\n"));
4406 conn_free_internal( &conn );
4407 return NULL;
4408 }
4409
4410 ZERO_STRUCT( finfo );
4411 ZERO_STRUCT( fh );
4412
4413 finfo.fnum = -1;
4414 finfo.conn = &conn;
4415 finfo.fh = &fh;
4416 finfo.fh->fd = -1;
4417 pstrcpy( filename, fname );
4418 finfo.fsp_name = filename;
4419
4420 if (get_nt_acl( &finfo, DACL_SECURITY_INFORMATION, &psd ) == 0) {
4421 DEBUG(0,("get_nt_acl_no_snum: get_nt_acl returned zero.\n"));
4422 conn_free_internal( &conn );
4423 return NULL;
4424 }
4425
4426 ret_sd = dup_sec_desc( ctx, psd );
4427
4428 conn_free_internal( &conn );
4429
4430 return ret_sd;
4431 }
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