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r428: add acls debug class
[Samba.git] / source3 / smbd / posix_acls.c
blob158f1a0ede80c4aff0d45e777fc291f512d0a250
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 #undef DBGC_CLASS
25 #define DBGC_CLASS DBGC_ACLS
26
27 /****************************************************************************
28 Data structures representing the internal ACE format.
29 ****************************************************************************/
30
31 enum ace_owner {UID_ACE, GID_ACE, WORLD_ACE};
32 enum ace_attribute {ALLOW_ACE, DENY_ACE}; /* Used for incoming NT ACLS. */
33
34 typedef union posix_id {
35 uid_t uid;
36 gid_t gid;
37 int world;
38 } posix_id;
39
40 typedef struct canon_ace {
41 struct canon_ace *next, *prev;
42 SMB_ACL_TAG_T type;
43 mode_t perms; /* Only use S_I(R|W|X)USR mode bits here. */
44 DOM_SID trustee;
45 enum ace_owner owner_type;
46 enum ace_attribute attr;
47 posix_id unix_ug;
48 BOOL inherited;
49 } canon_ace;
50
51 #define ALL_ACE_PERMS (S_IRUSR|S_IWUSR|S_IXUSR)
52
53 /*
54 * EA format of user.SAMBA_PAI (Samba_Posix_Acl_Interitance)
55 * attribute on disk.
56 *
57 * | 1 | 1 | 2 | 2 | ....
58 * +------+------+-------------+---------------------+-------------+--------------------+
59 * | vers | flag | num_entries | num_default_entries | ..entries.. | default_entries... |
60 * +------+------+-------------+---------------------+-------------+--------------------+
61 */
62
63 #define PAI_VERSION_OFFSET 0
64 #define PAI_FLAG_OFFSET 1
65 #define PAI_NUM_ENTRIES_OFFSET 2
66 #define PAI_NUM_DEFAULT_ENTRIES_OFFSET 4
67 #define PAI_ENTRIES_BASE 6
68
69 #define PAI_VERSION 1
70 #define PAI_ACL_FLAG_PROTECTED 0x1
71 #define PAI_ENTRY_LENGTH 5
72
73 /*
74 * In memory format of user.SAMBA_PAI attribute.
75 */
76
77 struct pai_entry {
78 struct pai_entry *next, *prev;
79 enum ace_owner owner_type;
80 posix_id unix_ug;
81 };
82
83 struct pai_val {
84 BOOL protected;
85 unsigned int num_entries;
86 struct pai_entry *entry_list;
87 unsigned int num_def_entries;
88 struct pai_entry *def_entry_list;
89 };
90
91 /************************************************************************
92 Return a uint32 of the pai_entry principal.
93 ************************************************************************/
94
95 static uint32 get_pai_entry_val(struct pai_entry *paie)
96 {
97 switch (paie->owner_type) {
98 case UID_ACE:
99 DEBUG(10,("get_pai_entry_val: uid = %u\n", (unsigned int)paie->unix_ug.uid ));
100 return (uint32)paie->unix_ug.uid;
101 case GID_ACE:
102 DEBUG(10,("get_pai_entry_val: gid = %u\n", (unsigned int)paie->unix_ug.gid ));
103 return (uint32)paie->unix_ug.gid;
104 case WORLD_ACE:
105 default:
106 DEBUG(10,("get_pai_entry_val: world ace\n"));
107 return (uint32)-1;
108 }
109 }
110
111 /************************************************************************
112 Return a uint32 of the entry principal.
113 ************************************************************************/
114
115 static uint32 get_entry_val(canon_ace *ace_entry)
116 {
117 switch (ace_entry->owner_type) {
118 case UID_ACE:
119 DEBUG(10,("get_entry_val: uid = %u\n", (unsigned int)ace_entry->unix_ug.uid ));
120 return (uint32)ace_entry->unix_ug.uid;
121 case GID_ACE:
122 DEBUG(10,("get_entry_val: gid = %u\n", (unsigned int)ace_entry->unix_ug.gid ));
123 return (uint32)ace_entry->unix_ug.gid;
124 case WORLD_ACE:
125 default:
126 DEBUG(10,("get_entry_val: world ace\n"));
127 return (uint32)-1;
128 }
129 }
130
131 /************************************************************************
132 Count the inherited entries.
133 ************************************************************************/
134
135 static unsigned int num_inherited_entries(canon_ace *ace_list)
136 {
137 unsigned int num_entries = 0;
138
139 for (; ace_list; ace_list = ace_list->next)
140 if (ace_list->inherited)
141 num_entries++;
142 return num_entries;
143 }
144
145 /************************************************************************
146 Create the on-disk format. Caller must free.
147 ************************************************************************/
148
149 static char *create_pai_buf(canon_ace *file_ace_list, canon_ace *dir_ace_list, BOOL protected, size_t *store_size)
150 {
151 char *pai_buf = NULL;
152 canon_ace *ace_list = NULL;
153 char *entry_offset = NULL;
154 unsigned int num_entries = 0;
155 unsigned int num_def_entries = 0;
156
157 for (ace_list = file_ace_list; ace_list; ace_list = ace_list->next)
158 if (ace_list->inherited)
159 num_entries++;
160
161 for (ace_list = dir_ace_list; ace_list; ace_list = ace_list->next)
162 if (ace_list->inherited)
163 num_def_entries++;
164
165 DEBUG(10,("create_pai_buf: num_entries = %u, num_def_entries = %u\n", num_entries, num_def_entries ));
166
167 *store_size = PAI_ENTRIES_BASE + ((num_entries + num_def_entries)*PAI_ENTRY_LENGTH);
168
169 pai_buf = malloc(*store_size);
170 if (!pai_buf) {
171 return NULL;
172 }
173
174 /* Set up the header. */
175 memset(pai_buf, '\0', PAI_ENTRIES_BASE);
176 SCVAL(pai_buf,PAI_VERSION_OFFSET,PAI_VERSION);
177 SCVAL(pai_buf,PAI_FLAG_OFFSET,(protected ? PAI_ACL_FLAG_PROTECTED : 0));
178 SSVAL(pai_buf,PAI_NUM_ENTRIES_OFFSET,num_entries);
179 SSVAL(pai_buf,PAI_NUM_DEFAULT_ENTRIES_OFFSET,num_def_entries);
180
181 entry_offset = pai_buf + PAI_ENTRIES_BASE;
182
183 for (ace_list = dir_ace_list; ace_list; ace_list = ace_list->next) {
184 if (ace_list->inherited) {
185 uint8 type_val = (unsigned char)ace_list->owner_type;
186 uint32 entry_val = get_entry_val(ace_list);
187
188 SCVAL(entry_offset,0,type_val);
189 SIVAL(entry_offset,1,entry_val);
190 entry_offset += PAI_ENTRY_LENGTH;
191 }
192 }
193
194 for (ace_list = file_ace_list; ace_list; ace_list = ace_list->next) {
195 if (ace_list->inherited) {
196 uint8 type_val = (unsigned char)ace_list->owner_type;
197 uint32 entry_val = get_entry_val(ace_list);
198
199 SCVAL(entry_offset,0,type_val);
200 SIVAL(entry_offset,1,entry_val);
201 entry_offset += PAI_ENTRY_LENGTH;
202 }
203 }
204
205 return pai_buf;
206 }
207
208 /************************************************************************
209 Store the user.SAMBA_PAI attribute on disk.
210 ************************************************************************/
211
212 static void store_inheritance_attributes(files_struct *fsp, canon_ace *file_ace_list,
213 canon_ace *dir_ace_list, BOOL protected)
214 {
215 int ret;
216 size_t store_size;
217 char *pai_buf;
218
219 if (!lp_map_acl_inherit(SNUM(fsp->conn)))
220 return;
221
222 /*
223 * Don't store if this ACL isn't protected and
224 * none of the entries in it are marked as inherited.
225 */
226
227 if (!protected && num_inherited_entries(file_ace_list) == 0 && num_inherited_entries(dir_ace_list) == 0) {
228 /* Instead just remove the attribute if it exists. */
229 if (fsp->fd != -1)
230 SMB_VFS_FREMOVEXATTR(fsp, fsp->fd, SAMBA_POSIX_INHERITANCE_EA_NAME);
231 else
232 SMB_VFS_REMOVEXATTR(fsp->conn, fsp->fsp_name, SAMBA_POSIX_INHERITANCE_EA_NAME);
233 return;
234 }
235
236 pai_buf = create_pai_buf(file_ace_list, dir_ace_list, protected, &store_size);
237
238 if (fsp->fd != -1)
239 ret = SMB_VFS_FSETXATTR(fsp, fsp->fd, SAMBA_POSIX_INHERITANCE_EA_NAME,
240 pai_buf, store_size, 0);
241 else
242 ret = SMB_VFS_SETXATTR(fsp->conn,fsp->fsp_name, SAMBA_POSIX_INHERITANCE_EA_NAME,
243 pai_buf, store_size, 0);
244
245 SAFE_FREE(pai_buf);
246
247 DEBUG(10,("store_inheritance_attribute:%s for file %s\n", protected ? " (protected)" : "", fsp->fsp_name));
248 if (ret == -1 && errno != ENOSYS)
249 DEBUG(1,("store_inheritance_attribute: Error %s\n", strerror(errno) ));
250 }
251
252 /************************************************************************
253 Delete the in memory inheritance info.
254 ************************************************************************/
255
256 static void free_inherited_info(struct pai_val *pal)
257 {
258 if (pal) {
259 struct pai_entry *paie, *paie_next;
260 for (paie = pal->entry_list; paie; paie = paie_next) {
261 paie_next = paie->next;
262 SAFE_FREE(paie);
263 }
264 for (paie = pal->def_entry_list; paie; paie = paie_next) {
265 paie_next = paie->next;
266 SAFE_FREE(paie);
267 }
268 SAFE_FREE(pal);
269 }
270 }
271
272 /************************************************************************
273 Was this ACL protected ?
274 ************************************************************************/
275
276 static BOOL get_protected_flag(struct pai_val *pal)
277 {
278 if (!pal)
279 return False;
280 return pal->protected;
281 }
282
283 /************************************************************************
284 Was this ACE inherited ?
285 ************************************************************************/
286
287 static BOOL get_inherited_flag(struct pai_val *pal, canon_ace *ace_entry, BOOL default_ace)
288 {
289 struct pai_entry *paie;
290
291 if (!pal)
292 return False;
293
294 /* If the entry exists it is inherited. */
295 for (paie = (default_ace ? pal->def_entry_list : pal->entry_list); paie; paie = paie->next) {
296 if (ace_entry->owner_type == paie->owner_type &&
297 get_entry_val(ace_entry) == get_pai_entry_val(paie))
298 return True;
299 }
300 return False;
301 }
302
303 /************************************************************************
304 Ensure an attribute just read is valid.
305 ************************************************************************/
306
307 static BOOL check_pai_ok(char *pai_buf, size_t pai_buf_data_size)
308 {
309 uint16 num_entries;
310 uint16 num_def_entries;
311
312 if (pai_buf_data_size < PAI_ENTRIES_BASE) {
313 /* Corrupted - too small. */
314 return False;
315 }
316
317 if (CVAL(pai_buf,PAI_VERSION_OFFSET) != PAI_VERSION)
318 return False;
319
320 num_entries = SVAL(pai_buf,PAI_NUM_ENTRIES_OFFSET);
321 num_def_entries = SVAL(pai_buf,PAI_NUM_DEFAULT_ENTRIES_OFFSET);
322
323 /* Check the entry lists match. */
324 /* Each entry is 5 bytes (type plus 4 bytes of uid or gid). */
325
326 if (((num_entries + num_def_entries)*PAI_ENTRY_LENGTH) + PAI_ENTRIES_BASE != pai_buf_data_size)
327 return False;
328
329 return True;
330 }
331
332
333 /************************************************************************
334 Convert to in-memory format.
335 ************************************************************************/
336
337 static struct pai_val *create_pai_val(char *buf, size_t size)
338 {
339 char *entry_offset;
340 struct pai_val *paiv = NULL;
341 int i;
342
343 if (!check_pai_ok(buf, size))
344 return NULL;
345
346 paiv = malloc(sizeof(struct pai_val));
347 if (!paiv)
348 return NULL;
349
350 memset(paiv, '\0', sizeof(struct pai_val));
351
352 paiv->protected = (CVAL(buf,PAI_FLAG_OFFSET) == PAI_ACL_FLAG_PROTECTED);
353
354 paiv->num_entries = SVAL(buf,PAI_NUM_ENTRIES_OFFSET);
355 paiv->num_def_entries = SVAL(buf,PAI_NUM_DEFAULT_ENTRIES_OFFSET);
356
357 entry_offset = buf + PAI_ENTRIES_BASE;
358
359 DEBUG(10,("create_pai_val:%s num_entries = %u, num_def_entries = %u\n",
360 paiv->protected ? " (protected)" : "", paiv->num_entries, paiv->num_def_entries ));
361
362 for (i = 0; i < paiv->num_entries; i++) {
363 struct pai_entry *paie;
364
365 paie = malloc(sizeof(struct pai_entry));
366 if (!paie) {
367 free_inherited_info(paiv);
368 return NULL;
369 }
370
371 paie->owner_type = (enum ace_owner)CVAL(entry_offset,0);
372 switch( paie->owner_type) {
373 case UID_ACE:
374 paie->unix_ug.uid = (uid_t)IVAL(entry_offset,1);
375 DEBUG(10,("create_pai_val: uid = %u\n", (unsigned int)paie->unix_ug.uid ));
376 break;
377 case GID_ACE:
378 paie->unix_ug.gid = (gid_t)IVAL(entry_offset,1);
379 DEBUG(10,("create_pai_val: gid = %u\n", (unsigned int)paie->unix_ug.gid ));
380 break;
381 case WORLD_ACE:
382 paie->unix_ug.world = -1;
383 DEBUG(10,("create_pai_val: world ace\n"));
384 break;
385 default:
386 free_inherited_info(paiv);
387 return NULL;
388 }
389 entry_offset += PAI_ENTRY_LENGTH;
390 DLIST_ADD(paiv->entry_list, paie);
391 }
392
393 for (i = 0; i < paiv->num_def_entries; i++) {
394 struct pai_entry *paie;
395
396 paie = malloc(sizeof(struct pai_entry));
397 if (!paie) {
398 free_inherited_info(paiv);
399 return NULL;
400 }
401
402 paie->owner_type = (enum ace_owner)CVAL(entry_offset,0);
403 switch( paie->owner_type) {
404 case UID_ACE:
405 paie->unix_ug.uid = (uid_t)IVAL(entry_offset,1);
406 DEBUG(10,("create_pai_val: (def) uid = %u\n", (unsigned int)paie->unix_ug.uid ));
407 break;
408 case GID_ACE:
409 paie->unix_ug.gid = (gid_t)IVAL(entry_offset,1);
410 DEBUG(10,("create_pai_val: (def) gid = %u\n", (unsigned int)paie->unix_ug.gid ));
411 break;
412 case WORLD_ACE:
413 paie->unix_ug.world = -1;
414 DEBUG(10,("create_pai_val: (def) world ace\n"));
415 break;
416 default:
417 free_inherited_info(paiv);
418 return NULL;
419 }
420 entry_offset += PAI_ENTRY_LENGTH;
421 DLIST_ADD(paiv->def_entry_list, paie);
422 }
423
424 return paiv;
425 }
426
427 /************************************************************************
428 Load the user.SAMBA_PAI attribute.
429 ************************************************************************/
430
431 static struct pai_val *load_inherited_info(files_struct *fsp)
432 {
433 char *pai_buf;
434 size_t pai_buf_size = 1024;
435 struct pai_val *paiv = NULL;
436 ssize_t ret;
437
438 if (!lp_map_acl_inherit(SNUM(fsp->conn)))
439 return NULL;
440
441 if ((pai_buf = malloc(pai_buf_size)) == NULL)
442 return NULL;
443
444 do {
445 if (fsp->fd != -1)
446 ret = SMB_VFS_FGETXATTR(fsp, fsp->fd, SAMBA_POSIX_INHERITANCE_EA_NAME,
447 pai_buf, pai_buf_size);
448 else
449 ret = SMB_VFS_GETXATTR(fsp->conn,fsp->fsp_name,SAMBA_POSIX_INHERITANCE_EA_NAME,
450 pai_buf, pai_buf_size);
451
452 if (ret == -1) {
453 if (errno != ERANGE) {
454 break;
455 }
456 /* Buffer too small - enlarge it. */
457 pai_buf_size *= 2;
458 SAFE_FREE(pai_buf);
459 if ((pai_buf = malloc(pai_buf_size)) == NULL)
460 return NULL;
461 }
462 } while (ret == -1);
463
464 DEBUG(10,("load_inherited_info: ret = %lu for file %s\n", (unsigned long)ret, fsp->fsp_name));
465
466 if (ret == -1) {
467 /* No attribute or not supported. */
468 #if defined(ENOATTR)
469 if (errno != ENOATTR)
470 DEBUG(10,("load_inherited_info: Error %s\n", strerror(errno) ));
471 #else
472 if (errno != ENOSYS)
473 DEBUG(10,("load_inherited_info: Error %s\n", strerror(errno) ));
474 #endif
475 SAFE_FREE(pai_buf);
476 return NULL;
477 }
478
479 paiv = create_pai_val(pai_buf, ret);
480
481 if (paiv && paiv->protected)
482 DEBUG(10,("load_inherited_info: ACL is protected for file %s\n", fsp->fsp_name));
483
484 SAFE_FREE(pai_buf);
485 return paiv;
486 }
487
488 /****************************************************************************
489 Functions to manipulate the internal ACE format.
490 ****************************************************************************/
491
492 /****************************************************************************
493 Count a linked list of canonical ACE entries.
494 ****************************************************************************/
495
496 static size_t count_canon_ace_list( canon_ace *list_head )
497 {
498 size_t count = 0;
499 canon_ace *ace;
500
501 for (ace = list_head; ace; ace = ace->next)
502 count++;
503
504 return count;
505 }
506
507 /****************************************************************************
508 Free a linked list of canonical ACE entries.
509 ****************************************************************************/
510
511 static void free_canon_ace_list( canon_ace *list_head )
512 {
513 while (list_head) {
514 canon_ace *old_head = list_head;
515 DLIST_REMOVE(list_head, list_head);
516 SAFE_FREE(old_head);
517 }
518 }
519
520 /****************************************************************************
521 Function to duplicate a canon_ace entry.
522 ****************************************************************************/
523
524 static canon_ace *dup_canon_ace( canon_ace *src_ace)
525 {
526 canon_ace *dst_ace = (canon_ace *)malloc(sizeof(canon_ace));
527
528 if (dst_ace == NULL)
529 return NULL;
530
531 *dst_ace = *src_ace;
532 dst_ace->prev = dst_ace->next = NULL;
533 return dst_ace;
534 }
535
536 /****************************************************************************
537 Print out a canon ace.
538 ****************************************************************************/
539
540 static void print_canon_ace(canon_ace *pace, int num)
541 {
542 fstring str;
543
544 dbgtext( "canon_ace index %d. Type = %s ", num, pace->attr == ALLOW_ACE ? "allow" : "deny" );
545 dbgtext( "SID = %s ", sid_to_string( str, &pace->trustee));
546 if (pace->owner_type == UID_ACE) {
547 const char *u_name = uidtoname(pace->unix_ug.uid);
548 dbgtext( "uid %u (%s) ", (unsigned int)pace->unix_ug.uid, u_name );
549 } else if (pace->owner_type == GID_ACE) {
550 char *g_name = gidtoname(pace->unix_ug.gid);
551 dbgtext( "gid %u (%s) ", (unsigned int)pace->unix_ug.gid, g_name );
552 } else
553 dbgtext( "other ");
554 switch (pace->type) {
555 case SMB_ACL_USER:
556 dbgtext( "SMB_ACL_USER ");
557 break;
558 case SMB_ACL_USER_OBJ:
559 dbgtext( "SMB_ACL_USER_OBJ ");
560 break;
561 case SMB_ACL_GROUP:
562 dbgtext( "SMB_ACL_GROUP ");
563 break;
564 case SMB_ACL_GROUP_OBJ:
565 dbgtext( "SMB_ACL_GROUP_OBJ ");
566 break;
567 case SMB_ACL_OTHER:
568 dbgtext( "SMB_ACL_OTHER ");
569 break;
570 }
571 if (pace->inherited)
572 dbgtext( "(inherited) ");
573 dbgtext( "perms ");
574 dbgtext( "%c", pace->perms & S_IRUSR ? 'r' : '-');
575 dbgtext( "%c", pace->perms & S_IWUSR ? 'w' : '-');
576 dbgtext( "%c\n", pace->perms & S_IXUSR ? 'x' : '-');
577 }
578
579 /****************************************************************************
580 Print out a canon ace list.
581 ****************************************************************************/
582
583 static void print_canon_ace_list(const char *name, canon_ace *ace_list)
584 {
585 int count = 0;
586
587 if( DEBUGLVL( 10 )) {
588 dbgtext( "print_canon_ace_list: %s\n", name );
589 for (;ace_list; ace_list = ace_list->next, count++)
590 print_canon_ace(ace_list, count );
591 }
592 }
593
594 /****************************************************************************
595 Map POSIX ACL perms to canon_ace permissions (a mode_t containing only S_(R|W|X)USR bits).
596 ****************************************************************************/
597
598 static mode_t convert_permset_to_mode_t(connection_struct *conn, SMB_ACL_PERMSET_T permset)
599 {
600 mode_t ret = 0;
601
602 ret |= (SMB_VFS_SYS_ACL_GET_PERM(conn, permset, SMB_ACL_READ) ? S_IRUSR : 0);
603 ret |= (SMB_VFS_SYS_ACL_GET_PERM(conn, permset, SMB_ACL_WRITE) ? S_IWUSR : 0);
604 ret |= (SMB_VFS_SYS_ACL_GET_PERM(conn, permset, SMB_ACL_EXECUTE) ? S_IXUSR : 0);
605
606 return ret;
607 }
608
609 /****************************************************************************
610 Map generic UNIX permissions to canon_ace permissions (a mode_t containing only S_(R|W|X)USR bits).
611 ****************************************************************************/
612
613 static mode_t unix_perms_to_acl_perms(mode_t mode, int r_mask, int w_mask, int x_mask)
614 {
615 mode_t ret = 0;
616
617 if (mode & r_mask)
618 ret |= S_IRUSR;
619 if (mode & w_mask)
620 ret |= S_IWUSR;
621 if (mode & x_mask)
622 ret |= S_IXUSR;
623
624 return ret;
625 }
626
627 /****************************************************************************
628 Map canon_ace permissions (a mode_t containing only S_(R|W|X)USR bits) to
629 an SMB_ACL_PERMSET_T.
630 ****************************************************************************/
631
632 static int map_acl_perms_to_permset(connection_struct *conn, mode_t mode, SMB_ACL_PERMSET_T *p_permset)
633 {
634 if (SMB_VFS_SYS_ACL_CLEAR_PERMS(conn, *p_permset) == -1)
635 return -1;
636 if (mode & S_IRUSR) {
637 if (SMB_VFS_SYS_ACL_ADD_PERM(conn, *p_permset, SMB_ACL_READ) == -1)
638 return -1;
639 }
640 if (mode & S_IWUSR) {
641 if (SMB_VFS_SYS_ACL_ADD_PERM(conn, *p_permset, SMB_ACL_WRITE) == -1)
642 return -1;
643 }
644 if (mode & S_IXUSR) {
645 if (SMB_VFS_SYS_ACL_ADD_PERM(conn, *p_permset, SMB_ACL_EXECUTE) == -1)
646 return -1;
647 }
648 return 0;
649 }
650 /****************************************************************************
651 Function to create owner and group SIDs from a SMB_STRUCT_STAT.
652 ****************************************************************************/
653
654 static void create_file_sids(SMB_STRUCT_STAT *psbuf, DOM_SID *powner_sid, DOM_SID *pgroup_sid)
655 {
656 uid_to_sid( powner_sid, psbuf->st_uid );
657 gid_to_sid( pgroup_sid, psbuf->st_gid );
658 }
659
660 /****************************************************************************
661 Merge aces with a common sid - if both are allow or deny, OR the permissions together and
662 delete the second one. If the first is deny, mask the permissions off and delete the allow
663 if the permissions become zero, delete the deny if the permissions are non zero.
664 ****************************************************************************/
665
666 static void merge_aces( canon_ace **pp_list_head )
667 {
668 canon_ace *list_head = *pp_list_head;
669 canon_ace *curr_ace_outer;
670 canon_ace *curr_ace_outer_next;
671
672 /*
673 * First, merge allow entries with identical SIDs, and deny entries
674 * with identical SIDs.
675 */
676
677 for (curr_ace_outer = list_head; curr_ace_outer; curr_ace_outer = curr_ace_outer_next) {
678 canon_ace *curr_ace;
679 canon_ace *curr_ace_next;
680
681 curr_ace_outer_next = curr_ace_outer->next; /* Save the link in case we delete. */
682
683 for (curr_ace = curr_ace_outer->next; curr_ace; curr_ace = curr_ace_next) {
684
685 curr_ace_next = curr_ace->next; /* Save the link in case of delete. */
686
687 if (sid_equal(&curr_ace->trustee, &curr_ace_outer->trustee) &&
688 (curr_ace->attr == curr_ace_outer->attr)) {
689
690 if( DEBUGLVL( 10 )) {
691 dbgtext("merge_aces: Merging ACE's\n");
692 print_canon_ace( curr_ace_outer, 0);
693 print_canon_ace( curr_ace, 0);
694 }
695
696 /* Merge two allow or two deny ACE's. */
697
698 curr_ace_outer->perms |= curr_ace->perms;
699 DLIST_REMOVE(list_head, curr_ace);
700 SAFE_FREE(curr_ace);
701 curr_ace_outer_next = curr_ace_outer->next; /* We may have deleted the link. */
702 }
703 }
704 }
705
706 /*
707 * Now go through and mask off allow permissions with deny permissions.
708 * We can delete either the allow or deny here as we know that each SID
709 * appears only once in the list.
710 */
711
712 for (curr_ace_outer = list_head; curr_ace_outer; curr_ace_outer = curr_ace_outer_next) {
713 canon_ace *curr_ace;
714 canon_ace *curr_ace_next;
715
716 curr_ace_outer_next = curr_ace_outer->next; /* Save the link in case we delete. */
717
718 for (curr_ace = curr_ace_outer->next; curr_ace; curr_ace = curr_ace_next) {
719
720 curr_ace_next = curr_ace->next; /* Save the link in case of delete. */
721
722 /*
723 * Subtract ACE's with different entries. Due to the ordering constraints
724 * we've put on the ACL, we know the deny must be the first one.
725 */
726
727 if (sid_equal(&curr_ace->trustee, &curr_ace_outer->trustee) &&
728 (curr_ace_outer->attr == DENY_ACE) && (curr_ace->attr == ALLOW_ACE)) {
729
730 if( DEBUGLVL( 10 )) {
731 dbgtext("merge_aces: Masking ACE's\n");
732 print_canon_ace( curr_ace_outer, 0);
733 print_canon_ace( curr_ace, 0);
734 }
735
736 curr_ace->perms &= ~curr_ace_outer->perms;
737
738 if (curr_ace->perms == 0) {
739
740 /*
741 * The deny overrides the allow. Remove the allow.
742 */
743
744 DLIST_REMOVE(list_head, curr_ace);
745 SAFE_FREE(curr_ace);
746 curr_ace_outer_next = curr_ace_outer->next; /* We may have deleted the link. */
747
748 } else {
749
750 /*
751 * Even after removing permissions, there
752 * are still allow permissions - delete the deny.
753 * It is safe to delete the deny here,
754 * as we are guarenteed by the deny first
755 * ordering that all the deny entries for
756 * this SID have already been merged into one
757 * before we can get to an allow ace.
758 */
759
760 DLIST_REMOVE(list_head, curr_ace_outer);
761 SAFE_FREE(curr_ace_outer);
762 break;
763 }
764 }
765
766 } /* end for curr_ace */
767 } /* end for curr_ace_outer */
768
769 /* We may have modified the list. */
770
771 *pp_list_head = list_head;
772 }
773
774 /****************************************************************************
775 Check if we need to return NT4.x compatible ACL entries.
776 ****************************************************************************/
777
778 static BOOL nt4_compatible_acls(void)
779 {
780 const char *compat = lp_acl_compatibility();
781
782 if (*compat == '\0') {
783 enum remote_arch_types ra_type = get_remote_arch();
784
785 /* Automatically adapt to client */
786 return (ra_type <= RA_WINNT);
787 } else
788 return (strequal(compat, "winnt"));
789 }
790
791
792 /****************************************************************************
793 Map canon_ace perms to permission bits NT.
794 The attr element is not used here - we only process deny entries on set,
795 not get. Deny entries are implicit on get with ace->perms = 0.
796 ****************************************************************************/
797
798 static SEC_ACCESS map_canon_ace_perms(int *pacl_type, DOM_SID *powner_sid, canon_ace *ace)
799 {
800 SEC_ACCESS sa;
801 uint32 nt_mask = 0;
802
803 *pacl_type = SEC_ACE_TYPE_ACCESS_ALLOWED;
804
805 if ((ace->perms & ALL_ACE_PERMS) == ALL_ACE_PERMS) {
806 nt_mask = UNIX_ACCESS_RWX;
807 } else if ((ace->perms & ALL_ACE_PERMS) == (mode_t)0) {
808 /*
809 * Windows NT refuses to display ACEs with no permissions in them (but
810 * they are perfectly legal with Windows 2000). If the ACE has empty
811 * permissions we cannot use 0, so we use the otherwise unused
812 * WRITE_OWNER permission, which we ignore when we set an ACL.
813 * We abstract this into a #define of UNIX_ACCESS_NONE to allow this
814 * to be changed in the future.
815 */
816
817 if (nt4_compatible_acls())
818 nt_mask = UNIX_ACCESS_NONE;
819 else
820 nt_mask = 0;
821 } else {
822 nt_mask |= ((ace->perms & S_IRUSR) ? UNIX_ACCESS_R : 0 );
823 nt_mask |= ((ace->perms & S_IWUSR) ? UNIX_ACCESS_W : 0 );
824 nt_mask |= ((ace->perms & S_IXUSR) ? UNIX_ACCESS_X : 0 );
825 }
826
827 DEBUG(10,("map_canon_ace_perms: Mapped (UNIX) %x to (NT) %x\n",
828 (unsigned int)ace->perms, (unsigned int)nt_mask ));
829
830 init_sec_access(&sa,nt_mask);
831 return sa;
832 }
833
834 /****************************************************************************
835 Map NT perms to a UNIX mode_t.
836 ****************************************************************************/
837
838 #define FILE_SPECIFIC_READ_BITS (FILE_READ_DATA|FILE_READ_EA|FILE_READ_ATTRIBUTES)
839 #define FILE_SPECIFIC_WRITE_BITS (FILE_WRITE_DATA|FILE_APPEND_DATA|FILE_WRITE_EA|FILE_WRITE_ATTRIBUTES)
840 #define FILE_SPECIFIC_EXECUTE_BITS (FILE_EXECUTE)
841
842 static mode_t map_nt_perms( SEC_ACCESS sec_access, int type)
843 {
844 mode_t mode = 0;
845
846 switch(type) {
847 case S_IRUSR:
848 if(sec_access.mask & GENERIC_ALL_ACCESS)
849 mode = S_IRUSR|S_IWUSR|S_IXUSR;
850 else {
851 mode |= (sec_access.mask & (GENERIC_READ_ACCESS|FILE_SPECIFIC_READ_BITS)) ? S_IRUSR : 0;
852 mode |= (sec_access.mask & (GENERIC_WRITE_ACCESS|FILE_SPECIFIC_WRITE_BITS)) ? S_IWUSR : 0;
853 mode |= (sec_access.mask & (GENERIC_EXECUTE_ACCESS|FILE_SPECIFIC_EXECUTE_BITS)) ? S_IXUSR : 0;
854 }
855 break;
856 case S_IRGRP:
857 if(sec_access.mask & GENERIC_ALL_ACCESS)
858 mode = S_IRGRP|S_IWGRP|S_IXGRP;
859 else {
860 mode |= (sec_access.mask & (GENERIC_READ_ACCESS|FILE_SPECIFIC_READ_BITS)) ? S_IRGRP : 0;
861 mode |= (sec_access.mask & (GENERIC_WRITE_ACCESS|FILE_SPECIFIC_WRITE_BITS)) ? S_IWGRP : 0;
862 mode |= (sec_access.mask & (GENERIC_EXECUTE_ACCESS|FILE_SPECIFIC_EXECUTE_BITS)) ? S_IXGRP : 0;
863 }
864 break;
865 case S_IROTH:
866 if(sec_access.mask & GENERIC_ALL_ACCESS)
867 mode = S_IROTH|S_IWOTH|S_IXOTH;
868 else {
869 mode |= (sec_access.mask & (GENERIC_READ_ACCESS|FILE_SPECIFIC_READ_BITS)) ? S_IROTH : 0;
870 mode |= (sec_access.mask & (GENERIC_WRITE_ACCESS|FILE_SPECIFIC_WRITE_BITS)) ? S_IWOTH : 0;
871 mode |= (sec_access.mask & (GENERIC_EXECUTE_ACCESS|FILE_SPECIFIC_EXECUTE_BITS)) ? S_IXOTH : 0;
872 }
873 break;
874 }
875
876 return mode;
877 }
878
879 /****************************************************************************
880 Unpack a SEC_DESC into a UNIX owner and group.
881 ****************************************************************************/
882
883 static BOOL unpack_nt_owners(SMB_STRUCT_STAT *psbuf, uid_t *puser, gid_t *pgrp, uint32 security_info_sent, SEC_DESC *psd)
884 {
885 DOM_SID owner_sid;
886 DOM_SID grp_sid;
887
888 *puser = (uid_t)-1;
889 *pgrp = (gid_t)-1;
890
891 if(security_info_sent == 0) {
892 DEBUG(0,("unpack_nt_owners: no security info sent !\n"));
893 return True;
894 }
895
896 /*
897 * Validate the owner and group SID's.
898 */
899
900 memset(&owner_sid, '\0', sizeof(owner_sid));
901 memset(&grp_sid, '\0', sizeof(grp_sid));
902
903 DEBUG(5,("unpack_nt_owners: validating owner_sids.\n"));
904
905 /*
906 * Don't immediately fail if the owner sid cannot be validated.
907 * This may be a group chown only set.
908 */
909
910 if (security_info_sent & OWNER_SECURITY_INFORMATION) {
911 sid_copy(&owner_sid, psd->owner_sid);
912 if (!NT_STATUS_IS_OK(sid_to_uid(&owner_sid, puser))) {
913 #if ACL_FORCE_UNMAPPABLE
914 /* this allows take ownership to work reasonably */
915 extern struct current_user current_user;
916 *puser = current_user.uid;
917 #else
918 DEBUG(3,("unpack_nt_owners: unable to validate owner sid for %s\n",
919 sid_string_static(&owner_sid)));
920 return False;
921 #endif
922 }
923 }
924
925 /*
926 * Don't immediately fail if the group sid cannot be validated.
927 * This may be an owner chown only set.
928 */
929
930 if (security_info_sent & GROUP_SECURITY_INFORMATION) {
931 sid_copy(&grp_sid, psd->grp_sid);
932 if (!NT_STATUS_IS_OK(sid_to_gid( &grp_sid, pgrp))) {
933 #if ACL_FORCE_UNMAPPABLE
934 /* this allows take group ownership to work reasonably */
935 extern struct current_user current_user;
936 *pgrp = current_user.gid;
937 #else
938 DEBUG(3,("unpack_nt_owners: unable to validate group sid.\n"));
939 return False;
940 #endif
941 }
942 }
943
944 DEBUG(5,("unpack_nt_owners: owner_sids validated.\n"));
945
946 return True;
947 }
948
949 /****************************************************************************
950 Ensure the enforced permissions for this share apply.
951 ****************************************************************************/
952
953 static void apply_default_perms(files_struct *fsp, canon_ace *pace, mode_t type)
954 {
955 int snum = SNUM(fsp->conn);
956 mode_t and_bits = (mode_t)0;
957 mode_t or_bits = (mode_t)0;
958
959 /* Get the initial bits to apply. */
960
961 if (fsp->is_directory) {
962 and_bits = lp_dir_security_mask(snum);
963 or_bits = lp_force_dir_security_mode(snum);
964 } else {
965 and_bits = lp_security_mask(snum);
966 or_bits = lp_force_security_mode(snum);
967 }
968
969 /* Now bounce them into the S_USR space. */
970 switch(type) {
971 case S_IRUSR:
972 /* Ensure owner has read access. */
973 pace->perms |= S_IRUSR;
974 if (fsp->is_directory)
975 pace->perms |= (S_IWUSR|S_IXUSR);
976 and_bits = unix_perms_to_acl_perms(and_bits, S_IRUSR, S_IWUSR, S_IXUSR);
977 or_bits = unix_perms_to_acl_perms(or_bits, S_IRUSR, S_IWUSR, S_IXUSR);
978 break;
979 case S_IRGRP:
980 and_bits = unix_perms_to_acl_perms(and_bits, S_IRGRP, S_IWGRP, S_IXGRP);
981 or_bits = unix_perms_to_acl_perms(or_bits, S_IRGRP, S_IWGRP, S_IXGRP);
982 break;
983 case S_IROTH:
984 and_bits = unix_perms_to_acl_perms(and_bits, S_IROTH, S_IWOTH, S_IXOTH);
985 or_bits = unix_perms_to_acl_perms(or_bits, S_IROTH, S_IWOTH, S_IXOTH);
986 break;
987 }
988
989 pace->perms = ((pace->perms & and_bits)|or_bits);
990 }
991
992 /****************************************************************************
993 Check if a given uid/SID is in a group gid/SID. This is probably very
994 expensive and will need optimisation. A *lot* of optimisation :-). JRA.
995 ****************************************************************************/
996
997 static BOOL uid_entry_in_group( canon_ace *uid_ace, canon_ace *group_ace )
998 {
999 extern DOM_SID global_sid_World;
1000 fstring u_name;
1001 fstring g_name;
1002 extern struct current_user current_user;
1003
1004 /* "Everyone" always matches every uid. */
1005
1006 if (sid_equal(&group_ace->trustee, &global_sid_World))
1007 return True;
1008
1009 /* Assume that the current user is in the current group (force group) */
1010
1011 if (uid_ace->unix_ug.uid == current_user.uid && group_ace->unix_ug.gid == current_user.gid)
1012 return True;
1013
1014 fstrcpy(u_name, uidtoname(uid_ace->unix_ug.uid));
1015 fstrcpy(g_name, gidtoname(group_ace->unix_ug.gid));
1016
1017 /*
1018 * Due to the winbind interfaces we need to do this via names,
1019 * not uids/gids.
1020 */
1021
1022 return user_in_group_list(u_name, g_name, NULL, 0);
1023 }
1024
1025 /****************************************************************************
1026 A well formed POSIX file or default ACL has at least 3 entries, a
1027 SMB_ACL_USER_OBJ, SMB_ACL_GROUP_OBJ, SMB_ACL_OTHER_OBJ.
1028 In addition, the owner must always have at least read access.
1029 When using this call on get_acl, the pst struct is valid and contains
1030 the mode of the file. When using this call on set_acl, the pst struct has
1031 been modified to have a mode containing the default for this file or directory
1032 type.
1033 ****************************************************************************/
1034
1035 static BOOL ensure_canon_entry_valid(canon_ace **pp_ace,
1036 files_struct *fsp,
1037 DOM_SID *pfile_owner_sid,
1038 DOM_SID *pfile_grp_sid,
1039 SMB_STRUCT_STAT *pst,
1040 BOOL setting_acl)
1041 {
1042 extern DOM_SID global_sid_World;
1043 canon_ace *pace;
1044 BOOL got_user = False;
1045 BOOL got_grp = False;
1046 BOOL got_other = False;
1047 canon_ace *pace_other = NULL;
1048 canon_ace *pace_group = NULL;
1049
1050 for (pace = *pp_ace; pace; pace = pace->next) {
1051 if (pace->type == SMB_ACL_USER_OBJ) {
1052
1053 if (setting_acl)
1054 apply_default_perms(fsp, pace, S_IRUSR);
1055 got_user = True;
1056
1057 } else if (pace->type == SMB_ACL_GROUP_OBJ) {
1058
1059 /*
1060 * Ensure create mask/force create mode is respected on set.
1061 */
1062
1063 if (setting_acl)
1064 apply_default_perms(fsp, pace, S_IRGRP);
1065 got_grp = True;
1066 pace_group = pace;
1067
1068 } else if (pace->type == SMB_ACL_OTHER) {
1069
1070 /*
1071 * Ensure create mask/force create mode is respected on set.
1072 */
1073
1074 if (setting_acl)
1075 apply_default_perms(fsp, pace, S_IROTH);
1076 got_other = True;
1077 pace_other = pace;
1078 }
1079 }
1080
1081 if (!got_user) {
1082 if ((pace = (canon_ace *)malloc(sizeof(canon_ace))) == NULL) {
1083 DEBUG(0,("ensure_canon_entry_valid: malloc fail.\n"));
1084 return False;
1085 }
1086
1087 ZERO_STRUCTP(pace);
1088 pace->type = SMB_ACL_USER_OBJ;
1089 pace->owner_type = UID_ACE;
1090 pace->unix_ug.uid = pst->st_uid;
1091 pace->trustee = *pfile_owner_sid;
1092 pace->attr = ALLOW_ACE;
1093
1094 if (setting_acl) {
1095 /* If we only got an "everyone" perm, just use that. */
1096 if (!got_grp && got_other)
1097 pace->perms = pace_other->perms;
1098 else if (got_grp && uid_entry_in_group(pace, pace_group))
1099 pace->perms = pace_group->perms;
1100 else
1101 pace->perms = 0;
1102
1103 apply_default_perms(fsp, pace, S_IRUSR);
1104 } else {
1105 pace->perms = unix_perms_to_acl_perms(pst->st_mode, S_IRUSR, S_IWUSR, S_IXUSR);
1106 }
1107
1108 DLIST_ADD(*pp_ace, pace);
1109 }
1110
1111 if (!got_grp) {
1112 if ((pace = (canon_ace *)malloc(sizeof(canon_ace))) == NULL) {
1113 DEBUG(0,("ensure_canon_entry_valid: malloc fail.\n"));
1114 return False;
1115 }
1116
1117 ZERO_STRUCTP(pace);
1118 pace->type = SMB_ACL_GROUP_OBJ;
1119 pace->owner_type = GID_ACE;
1120 pace->unix_ug.uid = pst->st_gid;
1121 pace->trustee = *pfile_grp_sid;
1122 pace->attr = ALLOW_ACE;
1123 if (setting_acl) {
1124 /* If we only got an "everyone" perm, just use that. */
1125 if (got_other)
1126 pace->perms = pace_other->perms;
1127 else
1128 pace->perms = 0;
1129 apply_default_perms(fsp, pace, S_IRGRP);
1130 } else {
1131 pace->perms = unix_perms_to_acl_perms(pst->st_mode, S_IRGRP, S_IWGRP, S_IXGRP);
1132 }
1133
1134 DLIST_ADD(*pp_ace, pace);
1135 }
1136
1137 if (!got_other) {
1138 if ((pace = (canon_ace *)malloc(sizeof(canon_ace))) == NULL) {
1139 DEBUG(0,("ensure_canon_entry_valid: malloc fail.\n"));
1140 return False;
1141 }
1142
1143 ZERO_STRUCTP(pace);
1144 pace->type = SMB_ACL_OTHER;
1145 pace->owner_type = WORLD_ACE;
1146 pace->unix_ug.world = -1;
1147 pace->trustee = global_sid_World;
1148 pace->attr = ALLOW_ACE;
1149 if (setting_acl) {
1150 pace->perms = 0;
1151 apply_default_perms(fsp, pace, S_IROTH);
1152 } else
1153 pace->perms = unix_perms_to_acl_perms(pst->st_mode, S_IROTH, S_IWOTH, S_IXOTH);
1154
1155 DLIST_ADD(*pp_ace, pace);
1156 }
1157
1158 return True;
1159 }
1160
1161 /****************************************************************************
1162 Check if a POSIX ACL has the required SMB_ACL_USER_OBJ and SMB_ACL_GROUP_OBJ entries.
1163 If it does not have them, check if there are any entries where the trustee is the
1164 file owner or the owning group, and map these to SMB_ACL_USER_OBJ and SMB_ACL_GROUP_OBJ.
1165 ****************************************************************************/
1166
1167 static void check_owning_objs(canon_ace *ace, DOM_SID *pfile_owner_sid, DOM_SID *pfile_grp_sid)
1168 {
1169 BOOL got_user_obj, got_group_obj;
1170 canon_ace *current_ace;
1171 int i, entries;
1172
1173 entries = count_canon_ace_list(ace);
1174 got_user_obj = False;
1175 got_group_obj = False;
1176
1177 for (i=0, current_ace = ace; i < entries; i++, current_ace = current_ace->next) {
1178 if (current_ace->type == SMB_ACL_USER_OBJ)
1179 got_user_obj = True;
1180 else if (current_ace->type == SMB_ACL_GROUP_OBJ)
1181 got_group_obj = True;
1182 }
1183 if (got_user_obj && got_group_obj) {
1184 DEBUG(10,("check_owning_objs: ACL had owning user/group entries.\n"));
1185 return;
1186 }
1187
1188 for (i=0, current_ace = ace; i < entries; i++, current_ace = current_ace->next) {
1189 if (!got_user_obj && current_ace->owner_type == UID_ACE &&
1190 sid_equal(&current_ace->trustee, pfile_owner_sid)) {
1191 current_ace->type = SMB_ACL_USER_OBJ;
1192 got_user_obj = True;
1193 }
1194 if (!got_group_obj && current_ace->owner_type == GID_ACE &&
1195 sid_equal(&current_ace->trustee, pfile_grp_sid)) {
1196 current_ace->type = SMB_ACL_GROUP_OBJ;
1197 got_group_obj = True;
1198 }
1199 }
1200 if (!got_user_obj)
1201 DEBUG(10,("check_owning_objs: ACL is missing an owner entry.\n"));
1202 if (!got_group_obj)
1203 DEBUG(10,("check_owning_objs: ACL is missing an owning group entry.\n"));
1204 }
1205
1206 /****************************************************************************
1207 Unpack a SEC_DESC into two canonical ace lists.
1208 ****************************************************************************/
1209
1210 static BOOL create_canon_ace_lists(files_struct *fsp, SMB_STRUCT_STAT *pst,
1211 DOM_SID *pfile_owner_sid,
1212 DOM_SID *pfile_grp_sid,
1213 canon_ace **ppfile_ace, canon_ace **ppdir_ace,
1214 SEC_ACL *dacl)
1215 {
1216 extern DOM_SID global_sid_Creator_Owner;
1217 extern DOM_SID global_sid_Creator_Group;
1218 extern DOM_SID global_sid_World;
1219 extern struct generic_mapping file_generic_mapping;
1220 BOOL all_aces_are_inherit_only = (fsp->is_directory ? True : False);
1221 canon_ace *file_ace = NULL;
1222 canon_ace *dir_ace = NULL;
1223 canon_ace *tmp_ace = NULL;
1224 canon_ace *current_ace = NULL;
1225 BOOL got_dir_allow = False;
1226 BOOL got_file_allow = False;
1227 int i, j;
1228
1229 *ppfile_ace = NULL;
1230 *ppdir_ace = NULL;
1231
1232 /*
1233 * Convert the incoming ACL into a more regular form.
1234 */
1235
1236 for(i = 0; i < dacl->num_aces; i++) {
1237 SEC_ACE *psa = &dacl->ace[i];
1238
1239 if((psa->type != SEC_ACE_TYPE_ACCESS_ALLOWED) && (psa->type != SEC_ACE_TYPE_ACCESS_DENIED)) {
1240 DEBUG(3,("create_canon_ace_lists: unable to set anything but an ALLOW or DENY ACE.\n"));
1241 return False;
1242 }
1243
1244 if (nt4_compatible_acls()) {
1245 /*
1246 * The security mask may be UNIX_ACCESS_NONE which should map into
1247 * no permissions (we overload the WRITE_OWNER bit for this) or it
1248 * should be one of the ALL/EXECUTE/READ/WRITE bits. Arrange for this
1249 * to be so. Any other bits override the UNIX_ACCESS_NONE bit.
1250 */
1251
1252 /*
1253 * Convert GENERIC bits to specific bits.
1254 */
1255
1256 se_map_generic(&psa->info.mask, &file_generic_mapping);
1257
1258 psa->info.mask &= (UNIX_ACCESS_NONE|FILE_ALL_ACCESS);
1259
1260 if(psa->info.mask != UNIX_ACCESS_NONE)
1261 psa->info.mask &= ~UNIX_ACCESS_NONE;
1262 }
1263 }
1264
1265 /*
1266 * Deal with the fact that NT 4.x re-writes the canonical format
1267 * that we return for default ACLs. If a directory ACE is identical
1268 * to a inherited directory ACE then NT changes the bits so that the
1269 * first ACE is set to OI|IO and the second ACE for this SID is set
1270 * to CI. We need to repair this. JRA.
1271 */
1272
1273 for(i = 0; i < dacl->num_aces; i++) {
1274 SEC_ACE *psa1 = &dacl->ace[i];
1275
1276 for (j = i + 1; j < dacl->num_aces; j++) {
1277 SEC_ACE *psa2 = &dacl->ace[j];
1278
1279 if (psa1->info.mask != psa2->info.mask)
1280 continue;
1281
1282 if (!sid_equal(&psa1->trustee, &psa2->trustee))
1283 continue;
1284
1285 /*
1286 * Ok - permission bits and SIDs are equal.
1287 * Check if flags were re-written.
1288 */
1289
1290 if (psa1->flags & SEC_ACE_FLAG_INHERIT_ONLY) {
1291
1292 psa1->flags |= (psa2->flags & (SEC_ACE_FLAG_CONTAINER_INHERIT|SEC_ACE_FLAG_OBJECT_INHERIT));
1293 psa2->flags &= ~(SEC_ACE_FLAG_CONTAINER_INHERIT|SEC_ACE_FLAG_OBJECT_INHERIT);
1294
1295 } else if (psa2->flags & SEC_ACE_FLAG_INHERIT_ONLY) {
1296
1297 psa2->flags |= (psa1->flags & (SEC_ACE_FLAG_CONTAINER_INHERIT|SEC_ACE_FLAG_OBJECT_INHERIT));
1298 psa1->flags &= ~(SEC_ACE_FLAG_CONTAINER_INHERIT|SEC_ACE_FLAG_OBJECT_INHERIT);
1299
1300 }
1301 }
1302 }
1303
1304 for(i = 0; i < dacl->num_aces; i++) {
1305 SEC_ACE *psa = &dacl->ace[i];
1306
1307 /*
1308 * Ignore non-mappable SIDs (NT Authority, BUILTIN etc).
1309 */
1310
1311 if (non_mappable_sid(&psa->trustee)) {
1312 fstring str;
1313 DEBUG(10,("create_canon_ace_lists: ignoring non-mappable SID %s\n",
1314 sid_to_string(str, &psa->trustee) ));
1315 continue;
1316 }
1317
1318 /*
1319 * Create a cannon_ace entry representing this NT DACL ACE.
1320 */
1321
1322 if ((current_ace = (canon_ace *)malloc(sizeof(canon_ace))) == NULL) {
1323 free_canon_ace_list(file_ace);
1324 free_canon_ace_list(dir_ace);
1325 DEBUG(0,("create_canon_ace_lists: malloc fail.\n"));
1326 return False;
1327 }
1328
1329 ZERO_STRUCTP(current_ace);
1330
1331 sid_copy(&current_ace->trustee, &psa->trustee);
1332
1333 /*
1334 * Try and work out if the SID is a user or group
1335 * as we need to flag these differently for POSIX.
1336 * Note what kind of a POSIX ACL this should map to.
1337 */
1338
1339 if( sid_equal(&current_ace->trustee, &global_sid_World)) {
1340 current_ace->owner_type = WORLD_ACE;
1341 current_ace->unix_ug.world = -1;
1342 current_ace->type = SMB_ACL_OTHER;
1343 } else if (sid_equal(&current_ace->trustee, &global_sid_Creator_Owner)) {
1344 current_ace->owner_type = UID_ACE;
1345 current_ace->unix_ug.uid = pst->st_uid;
1346 current_ace->type = SMB_ACL_USER_OBJ;
1347
1348 /*
1349 * The Creator Owner entry only specifies inheritable permissions,
1350 * never access permissions. WinNT doesn't always set the ACE to
1351 *INHERIT_ONLY, though.
1352 */
1353
1354 if (nt4_compatible_acls())
1355 psa->flags |= SEC_ACE_FLAG_INHERIT_ONLY;
1356 } else if (sid_equal(&current_ace->trustee, &global_sid_Creator_Group)) {
1357 current_ace->owner_type = GID_ACE;
1358 current_ace->unix_ug.gid = pst->st_gid;
1359 current_ace->type = SMB_ACL_GROUP_OBJ;
1360
1361 /*
1362 * The Creator Group entry only specifies inheritable permissions,
1363 * never access permissions. WinNT doesn't always set the ACE to
1364 *INHERIT_ONLY, though.
1365 */
1366 if (nt4_compatible_acls())
1367 psa->flags |= SEC_ACE_FLAG_INHERIT_ONLY;
1368
1369 } else if (NT_STATUS_IS_OK(sid_to_uid( &current_ace->trustee, &current_ace->unix_ug.uid))) {
1370 current_ace->owner_type = UID_ACE;
1371 current_ace->type = SMB_ACL_USER;
1372 } else if (NT_STATUS_IS_OK(sid_to_gid( &current_ace->trustee, &current_ace->unix_ug.gid))) {
1373 current_ace->owner_type = GID_ACE;
1374 current_ace->type = SMB_ACL_GROUP;
1375 } else {
1376 fstring str;
1377
1378 free_canon_ace_list(file_ace);
1379 free_canon_ace_list(dir_ace);
1380 DEBUG(0,("create_canon_ace_lists: unable to map SID %s to uid or gid.\n",
1381 sid_to_string(str, &current_ace->trustee) ));
1382 SAFE_FREE(current_ace);
1383 return False;
1384 }
1385
1386 /*
1387 * Map the given NT permissions into a UNIX mode_t containing only
1388 * S_I(R|W|X)USR bits.
1389 */
1390
1391 current_ace->perms |= map_nt_perms( psa->info, S_IRUSR);
1392 current_ace->attr = (psa->type == SEC_ACE_TYPE_ACCESS_ALLOWED) ? ALLOW_ACE : DENY_ACE;
1393 current_ace->inherited = ((psa->flags & SEC_ACE_FLAG_INHERITED_ACE) ? True : False);
1394
1395 /*
1396 * Now add the created ace to either the file list, the directory
1397 * list, or both. We *MUST* preserve the order here (hence we use
1398 * DLIST_ADD_END) as NT ACLs are order dependent.
1399 */
1400
1401 if (fsp->is_directory) {
1402
1403 /*
1404 * We can only add to the default POSIX ACE list if the ACE is
1405 * designed to be inherited by both files and directories.
1406 */
1407
1408 if ((psa->flags & (SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT)) ==
1409 (SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT)) {
1410
1411 DLIST_ADD_END(dir_ace, current_ace, tmp_ace);
1412
1413 /*
1414 * Note if this was an allow ace. We can't process
1415 * any further deny ace's after this.
1416 */
1417
1418 if (current_ace->attr == ALLOW_ACE)
1419 got_dir_allow = True;
1420
1421 if ((current_ace->attr == DENY_ACE) && got_dir_allow) {
1422 DEBUG(0,("create_canon_ace_lists: malformed ACL in inheritable ACL ! \
1423 Deny entry after Allow entry. Failing to set on file %s.\n", fsp->fsp_name ));
1424 free_canon_ace_list(file_ace);
1425 free_canon_ace_list(dir_ace);
1426 SAFE_FREE(current_ace);
1427 return False;
1428 }
1429
1430 if( DEBUGLVL( 10 )) {
1431 dbgtext("create_canon_ace_lists: adding dir ACL:\n");
1432 print_canon_ace( current_ace, 0);
1433 }
1434
1435 /*
1436 * If this is not an inherit only ACE we need to add a duplicate
1437 * to the file acl.
1438 */
1439
1440 if (!(psa->flags & SEC_ACE_FLAG_INHERIT_ONLY)) {
1441 canon_ace *dup_ace = dup_canon_ace(current_ace);
1442
1443 if (!dup_ace) {
1444 DEBUG(0,("create_canon_ace_lists: malloc fail !\n"));
1445 free_canon_ace_list(file_ace);
1446 free_canon_ace_list(dir_ace);
1447 return False;
1448 }
1449
1450 /*
1451 * We must not free current_ace here as its
1452 * pointer is now owned by the dir_ace list.
1453 */
1454 current_ace = dup_ace;
1455 } else {
1456 /*
1457 * We must not free current_ace here as its
1458 * pointer is now owned by the dir_ace list.
1459 */
1460 current_ace = NULL;
1461 }
1462 }
1463 }
1464
1465 /*
1466 * Only add to the file ACL if not inherit only.
1467 */
1468
1469 if (!(psa->flags & SEC_ACE_FLAG_INHERIT_ONLY)) {
1470 DLIST_ADD_END(file_ace, current_ace, tmp_ace);
1471
1472 /*
1473 * Note if this was an allow ace. We can't process
1474 * any further deny ace's after this.
1475 */
1476
1477 if (current_ace->attr == ALLOW_ACE)
1478 got_file_allow = True;
1479
1480 if ((current_ace->attr == DENY_ACE) && got_file_allow) {
1481 DEBUG(0,("create_canon_ace_lists: malformed ACL in file ACL ! \
1482 Deny entry after Allow entry. Failing to set on file %s.\n", fsp->fsp_name ));
1483 free_canon_ace_list(file_ace);
1484 free_canon_ace_list(dir_ace);
1485 SAFE_FREE(current_ace);
1486 return False;
1487 }
1488
1489 if( DEBUGLVL( 10 )) {
1490 dbgtext("create_canon_ace_lists: adding file ACL:\n");
1491 print_canon_ace( current_ace, 0);
1492 }
1493 all_aces_are_inherit_only = False;
1494 /*
1495 * We must not free current_ace here as its
1496 * pointer is now owned by the file_ace list.
1497 */
1498 current_ace = NULL;
1499 }
1500
1501 /*
1502 * Free if ACE was not added.
1503 */
1504
1505 SAFE_FREE(current_ace);
1506 }
1507
1508 if (fsp->is_directory && all_aces_are_inherit_only) {
1509 /*
1510 * Windows 2000 is doing one of these weird 'inherit acl'
1511 * traverses to conserve NTFS ACL resources. Just pretend
1512 * there was no DACL sent. JRA.
1513 */
1514
1515 DEBUG(10,("create_canon_ace_lists: Win2k inherit acl traverse. Ignoring DACL.\n"));
1516 free_canon_ace_list(file_ace);
1517 free_canon_ace_list(dir_ace);
1518 file_ace = NULL;
1519 dir_ace = NULL;
1520 } else {
1521 /*
1522 * Check if we have SMB_ACL_USER_OBJ and SMB_ACL_GROUP_OBJ entries in each
1523 * ACL. If we don't have them, check if any SMB_ACL_USER/SMB_ACL_GROUP
1524 * entries can be converted to *_OBJ. Usually we will already have these
1525 * entries in the Default ACL, and the Access ACL will not have them.
1526 */
1527 check_owning_objs(file_ace, pfile_owner_sid, pfile_grp_sid);
1528 check_owning_objs(dir_ace, pfile_owner_sid, pfile_grp_sid);
1529 }
1530
1531 *ppfile_ace = file_ace;
1532 *ppdir_ace = dir_ace;
1533
1534 return True;
1535 }
1536
1537 /****************************************************************************
1538 ASCII art time again... JRA :-).
1539
1540 We have 4 cases to process when moving from an NT ACL to a POSIX ACL. Firstly,
1541 we insist the ACL is in canonical form (ie. all DENY entries preceede ALLOW
1542 entries). Secondly, the merge code has ensured that all duplicate SID entries for
1543 allow or deny have been merged, so the same SID can only appear once in the deny
1544 list or once in the allow list.
1545
1546 We then process as follows :
1547
1548 ---------------------------------------------------------------------------
1549 First pass - look for a Everyone DENY entry.
1550
1551 If it is deny all (rwx) trunate the list at this point.
1552 Else, walk the list from this point and use the deny permissions of this
1553 entry as a mask on all following allow entries. Finally, delete
1554 the Everyone DENY entry (we have applied it to everything possible).
1555
1556 In addition, in this pass we remove any DENY entries that have
1557 no permissions (ie. they are a DENY nothing).
1558 ---------------------------------------------------------------------------
1559 Second pass - only deal with deny user entries.
1560
1561 DENY user1 (perms XXX)
1562
1563 new_perms = 0
1564 for all following allow group entries where user1 is in group
1565 new_perms |= group_perms;
1566
1567 user1 entry perms = new_perms & ~ XXX;
1568
1569 Convert the deny entry to an allow entry with the new perms and
1570 push to the end of the list. Note if the user was in no groups
1571 this maps to a specific allow nothing entry for this user.
1572
1573 The common case from the NT ACL choser (userX deny all) is
1574 optimised so we don't do the group lookup - we just map to
1575 an allow nothing entry.
1576
1577 What we're doing here is inferring the allow permissions the
1578 person setting the ACE on user1 wanted by looking at the allow
1579 permissions on the groups the user is currently in. This will
1580 be a snapshot, depending on group membership but is the best
1581 we can do and has the advantage of failing closed rather than
1582 open.
1583 ---------------------------------------------------------------------------
1584 Third pass - only deal with deny group entries.
1585
1586 DENY group1 (perms XXX)
1587
1588 for all following allow user entries where user is in group1
1589 user entry perms = user entry perms & ~ XXX;
1590
1591 If there is a group Everyone allow entry with permissions YYY,
1592 convert the group1 entry to an allow entry and modify its
1593 permissions to be :
1594
1595 new_perms = YYY & ~ XXX
1596
1597 and push to the end of the list.
1598
1599 If there is no group Everyone allow entry then convert the
1600 group1 entry to a allow nothing entry and push to the end of the list.
1601
1602 Note that the common case from the NT ACL choser (groupX deny all)
1603 cannot be optimised here as we need to modify user entries who are
1604 in the group to change them to a deny all also.
1605
1606 What we're doing here is modifying the allow permissions of
1607 user entries (which are more specific in POSIX ACLs) to mask
1608 out the explicit deny set on the group they are in. This will
1609 be a snapshot depending on current group membership but is the
1610 best we can do and has the advantage of failing closed rather
1611 than open.
1612 ---------------------------------------------------------------------------
1613 Fourth pass - cope with cumulative permissions.
1614
1615 for all allow user entries, if there exists an allow group entry with
1616 more permissive permissions, and the user is in that group, rewrite the
1617 allow user permissions to contain both sets of permissions.
1618
1619 Currently the code for this is #ifdef'ed out as these semantics make
1620 no sense to me. JRA.
1621 ---------------------------------------------------------------------------
1622
1623 Note we *MUST* do the deny user pass first as this will convert deny user
1624 entries into allow user entries which can then be processed by the deny
1625 group pass.
1626
1627 The above algorithm took a *lot* of thinking about - hence this
1628 explaination :-). JRA.
1629 ****************************************************************************/
1630
1631 /****************************************************************************
1632 Process a canon_ace list entries. This is very complex code. We need
1633 to go through and remove the "deny" permissions from any allow entry that matches
1634 the id of this entry. We have already refused any NT ACL that wasn't in correct
1635 order (DENY followed by ALLOW). If any allow entry ends up with zero permissions,
1636 we just remove it (to fail safe). We have already removed any duplicate ace
1637 entries. Treat an "Everyone" DENY_ACE as a special case - use it to mask all
1638 allow entries.
1639 ****************************************************************************/
1640
1641 static void process_deny_list( canon_ace **pp_ace_list )
1642 {
1643 extern DOM_SID global_sid_World;
1644 canon_ace *ace_list = *pp_ace_list;
1645 canon_ace *curr_ace = NULL;
1646 canon_ace *curr_ace_next = NULL;
1647
1648 /* Pass 1 above - look for an Everyone, deny entry. */
1649
1650 for (curr_ace = ace_list; curr_ace; curr_ace = curr_ace_next) {
1651 canon_ace *allow_ace_p;
1652
1653 curr_ace_next = curr_ace->next; /* So we can't lose the link. */
1654
1655 if (curr_ace->attr != DENY_ACE)
1656 continue;
1657
1658 if (curr_ace->perms == (mode_t)0) {
1659
1660 /* Deny nothing entry - delete. */
1661
1662 DLIST_REMOVE(ace_list, curr_ace);
1663 continue;
1664 }
1665
1666 if (!sid_equal(&curr_ace->trustee, &global_sid_World))
1667 continue;
1668
1669 /* JRATEST - assert. */
1670 SMB_ASSERT(curr_ace->owner_type == WORLD_ACE);
1671
1672 if (curr_ace->perms == ALL_ACE_PERMS) {
1673
1674 /*
1675 * Optimisation. This is a DENY_ALL to Everyone. Truncate the
1676 * list at this point including this entry.
1677 */
1678
1679 canon_ace *prev_entry = curr_ace->prev;
1680
1681 free_canon_ace_list( curr_ace );
1682 if (prev_entry)
1683 prev_entry->next = NULL;
1684 else {
1685 /* We deleted the entire list. */
1686 ace_list = NULL;
1687 }
1688 break;
1689 }
1690
1691 for (allow_ace_p = curr_ace->next; allow_ace_p; allow_ace_p = allow_ace_p->next) {
1692
1693 /*
1694 * Only mask off allow entries.
1695 */
1696
1697 if (allow_ace_p->attr != ALLOW_ACE)
1698 continue;
1699
1700 allow_ace_p->perms &= ~curr_ace->perms;
1701 }
1702
1703 /*
1704 * Now it's been applied, remove it.
1705 */
1706
1707 DLIST_REMOVE(ace_list, curr_ace);
1708 }
1709
1710 /* Pass 2 above - deal with deny user entries. */
1711
1712 for (curr_ace = ace_list; curr_ace; curr_ace = curr_ace_next) {
1713 mode_t new_perms = (mode_t)0;
1714 canon_ace *allow_ace_p;
1715 canon_ace *tmp_ace;
1716
1717 curr_ace_next = curr_ace->next; /* So we can't lose the link. */
1718
1719 if (curr_ace->attr != DENY_ACE)
1720 continue;
1721
1722 if (curr_ace->owner_type != UID_ACE)
1723 continue;
1724
1725 if (curr_ace->perms == ALL_ACE_PERMS) {
1726
1727 /*
1728 * Optimisation - this is a deny everything to this user.
1729 * Convert to an allow nothing and push to the end of the list.
1730 */
1731
1732 curr_ace->attr = ALLOW_ACE;
1733 curr_ace->perms = (mode_t)0;
1734 DLIST_DEMOTE(ace_list, curr_ace, tmp_ace);
1735 continue;
1736 }
1737
1738 for (allow_ace_p = curr_ace->next; allow_ace_p; allow_ace_p = allow_ace_p->next) {
1739
1740 if (allow_ace_p->attr != ALLOW_ACE)
1741 continue;
1742
1743 /* We process GID_ACE and WORLD_ACE entries only. */
1744
1745 if (allow_ace_p->owner_type == UID_ACE)
1746 continue;
1747
1748 if (uid_entry_in_group( curr_ace, allow_ace_p))
1749 new_perms |= allow_ace_p->perms;
1750 }
1751
1752 /*
1753 * Convert to a allow entry, modify the perms and push to the end
1754 * of the list.
1755 */
1756
1757 curr_ace->attr = ALLOW_ACE;
1758 curr_ace->perms = (new_perms & ~curr_ace->perms);
1759 DLIST_DEMOTE(ace_list, curr_ace, tmp_ace);
1760 }
1761
1762 /* Pass 3 above - deal with deny group entries. */
1763
1764 for (curr_ace = ace_list; curr_ace; curr_ace = curr_ace_next) {
1765 canon_ace *tmp_ace;
1766 canon_ace *allow_ace_p;
1767 canon_ace *allow_everyone_p = NULL;
1768
1769 curr_ace_next = curr_ace->next; /* So we can't lose the link. */
1770
1771 if (curr_ace->attr != DENY_ACE)
1772 continue;
1773
1774 if (curr_ace->owner_type != GID_ACE)
1775 continue;
1776
1777 for (allow_ace_p = curr_ace->next; allow_ace_p; allow_ace_p = allow_ace_p->next) {
1778
1779 if (allow_ace_p->attr != ALLOW_ACE)
1780 continue;
1781
1782 /* Store a pointer to the Everyone allow, if it exists. */
1783 if (allow_ace_p->owner_type == WORLD_ACE)
1784 allow_everyone_p = allow_ace_p;
1785
1786 /* We process UID_ACE entries only. */
1787
1788 if (allow_ace_p->owner_type != UID_ACE)
1789 continue;
1790
1791 /* Mask off the deny group perms. */
1792
1793 if (uid_entry_in_group( allow_ace_p, curr_ace))
1794 allow_ace_p->perms &= ~curr_ace->perms;
1795 }
1796
1797 /*
1798 * Convert the deny to an allow with the correct perms and
1799 * push to the end of the list.
1800 */
1801
1802 curr_ace->attr = ALLOW_ACE;
1803 if (allow_everyone_p)
1804 curr_ace->perms = allow_everyone_p->perms & ~curr_ace->perms;
1805 else
1806 curr_ace->perms = (mode_t)0;
1807 DLIST_DEMOTE(ace_list, curr_ace, tmp_ace);
1808
1809 }
1810
1811 /* Doing this fourth pass allows Windows semantics to be layered
1812 * on top of POSIX semantics. I'm not sure if this is desirable.
1813 * For example, in W2K ACLs there is no way to say, "Group X no
1814 * access, user Y full access" if user Y is a member of group X.
1815 * This seems completely broken semantics to me.... JRA.
1816 */
1817
1818 #if 0
1819 /* Pass 4 above - deal with allow entries. */
1820
1821 for (curr_ace = ace_list; curr_ace; curr_ace = curr_ace_next) {
1822 canon_ace *allow_ace_p;
1823
1824 curr_ace_next = curr_ace->next; /* So we can't lose the link. */
1825
1826 if (curr_ace->attr != ALLOW_ACE)
1827 continue;
1828
1829 if (curr_ace->owner_type != UID_ACE)
1830 continue;
1831
1832 for (allow_ace_p = ace_list; allow_ace_p; allow_ace_p = allow_ace_p->next) {
1833
1834 if (allow_ace_p->attr != ALLOW_ACE)
1835 continue;
1836
1837 /* We process GID_ACE entries only. */
1838
1839 if (allow_ace_p->owner_type != GID_ACE)
1840 continue;
1841
1842 /* OR in the group perms. */
1843
1844 if (uid_entry_in_group( curr_ace, allow_ace_p))
1845 curr_ace->perms |= allow_ace_p->perms;
1846 }
1847 }
1848 #endif
1849
1850 *pp_ace_list = ace_list;
1851 }
1852
1853 /****************************************************************************
1854 Create a default mode that will be used if a security descriptor entry has
1855 no user/group/world entries.
1856 ****************************************************************************/
1857
1858 static mode_t create_default_mode(files_struct *fsp, BOOL interitable_mode)
1859 {
1860 int snum = SNUM(fsp->conn);
1861 mode_t and_bits = (mode_t)0;
1862 mode_t or_bits = (mode_t)0;
1863 mode_t mode = interitable_mode ? unix_mode( fsp->conn, FILE_ATTRIBUTE_ARCHIVE, fsp->fsp_name) : S_IRUSR;
1864
1865 if (fsp->is_directory)
1866 mode |= (S_IWUSR|S_IXUSR);
1867
1868 /*
1869 * Now AND with the create mode/directory mode bits then OR with the
1870 * force create mode/force directory mode bits.
1871 */
1872
1873 if (fsp->is_directory) {
1874 and_bits = lp_dir_security_mask(snum);
1875 or_bits = lp_force_dir_security_mode(snum);
1876 } else {
1877 and_bits = lp_security_mask(snum);
1878 or_bits = lp_force_security_mode(snum);
1879 }
1880
1881 return ((mode & and_bits)|or_bits);
1882 }
1883
1884 /****************************************************************************
1885 Unpack a SEC_DESC into two canonical ace lists. We don't depend on this
1886 succeeding.
1887 ****************************************************************************/
1888
1889 static BOOL unpack_canon_ace(files_struct *fsp,
1890 SMB_STRUCT_STAT *pst,
1891 DOM_SID *pfile_owner_sid,
1892 DOM_SID *pfile_grp_sid,
1893 canon_ace **ppfile_ace, canon_ace **ppdir_ace,
1894 uint32 security_info_sent, SEC_DESC *psd)
1895 {
1896 canon_ace *file_ace = NULL;
1897 canon_ace *dir_ace = NULL;
1898
1899 *ppfile_ace = NULL;
1900 *ppdir_ace = NULL;
1901
1902 if(security_info_sent == 0) {
1903 DEBUG(0,("unpack_canon_ace: no security info sent !\n"));
1904 return False;
1905 }
1906
1907 /*
1908 * If no DACL then this is a chown only security descriptor.
1909 */
1910
1911 if(!(security_info_sent & DACL_SECURITY_INFORMATION) || !psd->dacl)
1912 return True;
1913
1914 /*
1915 * Now go through the DACL and create the canon_ace lists.
1916 */
1917
1918 if (!create_canon_ace_lists( fsp, pst, pfile_owner_sid, pfile_grp_sid,
1919 &file_ace, &dir_ace, psd->dacl))
1920 return False;
1921
1922 if ((file_ace == NULL) && (dir_ace == NULL)) {
1923 /* W2K traverse DACL set - ignore. */
1924 return True;
1925 }
1926
1927 /*
1928 * Go through the canon_ace list and merge entries
1929 * belonging to identical users of identical allow or deny type.
1930 * We can do this as all deny entries come first, followed by
1931 * all allow entries (we have mandated this before accepting this acl).
1932 */
1933
1934 print_canon_ace_list( "file ace - before merge", file_ace);
1935 merge_aces( &file_ace );
1936
1937 print_canon_ace_list( "dir ace - before merge", dir_ace);
1938 merge_aces( &dir_ace );
1939
1940 /*
1941 * NT ACLs are order dependent. Go through the acl lists and
1942 * process DENY entries by masking the allow entries.
1943 */
1944
1945 print_canon_ace_list( "file ace - before deny", file_ace);
1946 process_deny_list( &file_ace);
1947
1948 print_canon_ace_list( "dir ace - before deny", dir_ace);
1949 process_deny_list( &dir_ace);
1950
1951 /*
1952 * A well formed POSIX file or default ACL has at least 3 entries, a
1953 * SMB_ACL_USER_OBJ, SMB_ACL_GROUP_OBJ, SMB_ACL_OTHER_OBJ
1954 * and optionally a mask entry. Ensure this is the case.
1955 */
1956
1957 print_canon_ace_list( "file ace - before valid", file_ace);
1958
1959 /*
1960 * A default 3 element mode entry for a file should be r-- --- ---.
1961 * A default 3 element mode entry for a directory should be rwx --- ---.
1962 */
1963
1964 pst->st_mode = create_default_mode(fsp, False);
1965
1966 if (!ensure_canon_entry_valid(&file_ace, fsp, pfile_owner_sid, pfile_grp_sid, pst, True)) {
1967 free_canon_ace_list(file_ace);
1968 free_canon_ace_list(dir_ace);
1969 return False;
1970 }
1971
1972 print_canon_ace_list( "dir ace - before valid", dir_ace);
1973
1974 /*
1975 * A default inheritable 3 element mode entry for a directory should be the
1976 * mode Samba will use to create a file within. Ensure user rwx bits are set if
1977 * it's a directory.
1978 */
1979
1980 pst->st_mode = create_default_mode(fsp, True);
1981
1982 if (dir_ace && !ensure_canon_entry_valid(&dir_ace, fsp, pfile_owner_sid, pfile_grp_sid, pst, True)) {
1983 free_canon_ace_list(file_ace);
1984 free_canon_ace_list(dir_ace);
1985 return False;
1986 }
1987
1988 print_canon_ace_list( "file ace - return", file_ace);
1989 print_canon_ace_list( "dir ace - return", dir_ace);
1990
1991 *ppfile_ace = file_ace;
1992 *ppdir_ace = dir_ace;
1993 return True;
1994
1995 }
1996
1997 /******************************************************************************
1998 When returning permissions, try and fit NT display
1999 semantics if possible. Note the the canon_entries here must have been malloced.
2000 The list format should be - first entry = owner, followed by group and other user
2001 entries, last entry = other.
2002
2003 Note that this doesn't exactly match the NT semantics for an ACL. As POSIX entries
2004 are not ordered, and match on the most specific entry rather than walking a list,
2005 then a simple POSIX permission of rw-r--r-- should really map to 5 entries,
2006
2007 Entry 0: owner : deny all except read and write.
2008 Entry 1: group : deny all except read.
2009 Entry 2: owner : allow read and write.
2010 Entry 3: group : allow read.
2011 Entry 4: Everyone : allow read.
2012
2013 But NT cannot display this in their ACL editor !
2014 ********************************************************************************/
2015
2016 static void arrange_posix_perms( char *filename, canon_ace **pp_list_head)
2017 {
2018 canon_ace *list_head = *pp_list_head;
2019 canon_ace *owner_ace = NULL;
2020 canon_ace *other_ace = NULL;
2021 canon_ace *ace = NULL;
2022
2023 for (ace = list_head; ace; ace = ace->next) {
2024 if (ace->type == SMB_ACL_USER_OBJ)
2025 owner_ace = ace;
2026 else if (ace->type == SMB_ACL_OTHER) {
2027 /* Last ace - this is "other" */
2028 other_ace = ace;
2029 }
2030 }
2031
2032 if (!owner_ace || !other_ace) {
2033 DEBUG(0,("arrange_posix_perms: Invalid POSIX permissions for file %s, missing owner or other.\n",
2034 filename ));
2035 return;
2036 }
2037
2038 /*
2039 * The POSIX algorithm applies to owner first, and other last,
2040 * so ensure they are arranged in this order.
2041 */
2042
2043 if (owner_ace) {
2044 DLIST_PROMOTE(list_head, owner_ace);
2045 }
2046
2047 if (other_ace) {
2048 DLIST_DEMOTE(list_head, other_ace, ace);
2049 }
2050
2051 /* We have probably changed the head of the list. */
2052
2053 *pp_list_head = list_head;
2054 }
2055
2056 /****************************************************************************
2057 Create a linked list of canonical ACE entries.
2058 ****************************************************************************/
2059
2060 static canon_ace *canonicalise_acl( files_struct *fsp, SMB_ACL_T posix_acl, SMB_STRUCT_STAT *psbuf,
2061 DOM_SID *powner, DOM_SID *pgroup, struct pai_val *pal, SMB_ACL_TYPE_T the_acl_type)
2062 {
2063 extern DOM_SID global_sid_World;
2064 connection_struct *conn = fsp->conn;
2065 mode_t acl_mask = (S_IRUSR|S_IWUSR|S_IXUSR);
2066 canon_ace *list_head = NULL;
2067 canon_ace *ace = NULL;
2068 canon_ace *next_ace = NULL;
2069 int entry_id = SMB_ACL_FIRST_ENTRY;
2070 SMB_ACL_ENTRY_T entry;
2071 size_t ace_count;
2072
2073 while ( posix_acl && (SMB_VFS_SYS_ACL_GET_ENTRY(conn, posix_acl, entry_id, &entry) == 1)) {
2074 SMB_ACL_TAG_T tagtype;
2075 SMB_ACL_PERMSET_T permset;
2076 DOM_SID sid;
2077 posix_id unix_ug;
2078 enum ace_owner owner_type;
2079
2080 /* get_next... */
2081 if (entry_id == SMB_ACL_FIRST_ENTRY)
2082 entry_id = SMB_ACL_NEXT_ENTRY;
2083
2084 /* Is this a MASK entry ? */
2085 if (SMB_VFS_SYS_ACL_GET_TAG_TYPE(conn, entry, &tagtype) == -1)
2086 continue;
2087
2088 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, entry, &permset) == -1)
2089 continue;
2090
2091 /* Decide which SID to use based on the ACL type. */
2092 switch(tagtype) {
2093 case SMB_ACL_USER_OBJ:
2094 /* Get the SID from the owner. */
2095 sid_copy(&sid, powner);
2096 unix_ug.uid = psbuf->st_uid;
2097 owner_type = UID_ACE;
2098 break;
2099 case SMB_ACL_USER:
2100 {
2101 uid_t *puid = (uid_t *)SMB_VFS_SYS_ACL_GET_QUALIFIER(conn, entry);
2102 if (puid == NULL) {
2103 DEBUG(0,("canonicalise_acl: Failed to get uid.\n"));
2104 continue;
2105 }
2106 /*
2107 * A SMB_ACL_USER entry for the owner is shadowed by the
2108 * SMB_ACL_USER_OBJ entry and Windows also cannot represent
2109 * that entry, so we ignore it. We also don't create such
2110 * entries out of the blue when setting ACLs, so a get/set
2111 * cycle will drop them.
2112 */
2113 if (the_acl_type == SMB_ACL_TYPE_ACCESS && *puid == psbuf->st_uid)
2114 continue;
2115 uid_to_sid( &sid, *puid);
2116 unix_ug.uid = *puid;
2117 owner_type = UID_ACE;
2118 SMB_VFS_SYS_ACL_FREE_QUALIFIER(conn, (void *)puid,tagtype);
2119 break;
2120 }
2121 case SMB_ACL_GROUP_OBJ:
2122 /* Get the SID from the owning group. */
2123 sid_copy(&sid, pgroup);
2124 unix_ug.gid = psbuf->st_gid;
2125 owner_type = GID_ACE;
2126 break;
2127 case SMB_ACL_GROUP:
2128 {
2129 gid_t *pgid = (gid_t *)SMB_VFS_SYS_ACL_GET_QUALIFIER(conn, entry);
2130 if (pgid == NULL) {
2131 DEBUG(0,("canonicalise_acl: Failed to get gid.\n"));
2132 continue;
2133 }
2134 gid_to_sid( &sid, *pgid);
2135 unix_ug.gid = *pgid;
2136 owner_type = GID_ACE;
2137 SMB_VFS_SYS_ACL_FREE_QUALIFIER(conn, (void *)pgid,tagtype);
2138 break;
2139 }
2140 case SMB_ACL_MASK:
2141 acl_mask = convert_permset_to_mode_t(conn, permset);
2142 continue; /* Don't count the mask as an entry. */
2143 case SMB_ACL_OTHER:
2144 /* Use the Everyone SID */
2145 sid = global_sid_World;
2146 unix_ug.world = -1;
2147 owner_type = WORLD_ACE;
2148 break;
2149 default:
2150 DEBUG(0,("canonicalise_acl: Unknown tagtype %u\n", (unsigned int)tagtype));
2151 continue;
2152 }
2153
2154 /*
2155 * Add this entry to the list.
2156 */
2157
2158 if ((ace = (canon_ace *)malloc(sizeof(canon_ace))) == NULL)
2159 goto fail;
2160
2161 ZERO_STRUCTP(ace);
2162 ace->type = tagtype;
2163 ace->perms = convert_permset_to_mode_t(conn, permset);
2164 ace->attr = ALLOW_ACE;
2165 ace->trustee = sid;
2166 ace->unix_ug = unix_ug;
2167 ace->owner_type = owner_type;
2168 ace->inherited = get_inherited_flag(pal, ace, (the_acl_type == SMB_ACL_TYPE_DEFAULT));
2169
2170 DLIST_ADD(list_head, ace);
2171 }
2172
2173 /*
2174 * This next call will ensure we have at least a user/group/world set.
2175 */
2176
2177 if (!ensure_canon_entry_valid(&list_head, fsp, powner, pgroup, psbuf, False))
2178 goto fail;
2179
2180 /*
2181 * Now go through the list, masking the permissions with the
2182 * acl_mask. Ensure all DENY Entries are at the start of the list.
2183 */
2184
2185 DEBUG(10,("canonicalise_acl: %s ace entries before arrange :\n", the_acl_type == SMB_ACL_TYPE_ACCESS ? "Access" : "Default" ));
2186
2187 for ( ace_count = 0, ace = list_head; ace; ace = next_ace, ace_count++) {
2188 next_ace = ace->next;
2189
2190 /* Masks are only applied to entries other than USER_OBJ and OTHER. */
2191 if (ace->type != SMB_ACL_OTHER && ace->type != SMB_ACL_USER_OBJ)
2192 ace->perms &= acl_mask;
2193
2194 if (ace->perms == 0) {
2195 DLIST_PROMOTE(list_head, ace);
2196 }
2197
2198 if( DEBUGLVL( 10 ) ) {
2199 print_canon_ace(ace, ace_count);
2200 }
2201 }
2202
2203 arrange_posix_perms(fsp->fsp_name,&list_head );
2204
2205 print_canon_ace_list( "canonicalise_acl: ace entries after arrange", list_head );
2206
2207 return list_head;
2208
2209 fail:
2210
2211 free_canon_ace_list(list_head);
2212 return NULL;
2213 }
2214
2215 /****************************************************************************
2216 Attempt to apply an ACL to a file or directory.
2217 ****************************************************************************/
2218
2219 static BOOL set_canon_ace_list(files_struct *fsp, canon_ace *the_ace, BOOL default_ace, BOOL *pacl_set_support)
2220 {
2221 connection_struct *conn = fsp->conn;
2222 BOOL ret = False;
2223 SMB_ACL_T the_acl = SMB_VFS_SYS_ACL_INIT(conn, (int)count_canon_ace_list(the_ace) + 1);
2224 canon_ace *p_ace;
2225 int i;
2226 SMB_ACL_ENTRY_T mask_entry;
2227 BOOL got_mask_entry = False;
2228 SMB_ACL_PERMSET_T mask_permset;
2229 SMB_ACL_TYPE_T the_acl_type = (default_ace ? SMB_ACL_TYPE_DEFAULT : SMB_ACL_TYPE_ACCESS);
2230 BOOL needs_mask = False;
2231 mode_t mask_perms = 0;
2232
2233 #if defined(POSIX_ACL_NEEDS_MASK)
2234 /* HP-UX always wants to have a mask (called "class" there). */
2235 needs_mask = True;
2236 #endif
2237
2238 if (the_acl == NULL) {
2239
2240 if (errno != ENOSYS) {
2241 /*
2242 * Only print this error message if we have some kind of ACL
2243 * support that's not working. Otherwise we would always get this.
2244 */
2245 DEBUG(0,("set_canon_ace_list: Unable to init %s ACL. (%s)\n",
2246 default_ace ? "default" : "file", strerror(errno) ));
2247 }
2248 *pacl_set_support = False;
2249 return False;
2250 }
2251
2252 if( DEBUGLVL( 10 )) {
2253 dbgtext("set_canon_ace_list: setting ACL:\n");
2254 for (i = 0, p_ace = the_ace; p_ace; p_ace = p_ace->next, i++ ) {
2255 print_canon_ace( p_ace, i);
2256 }
2257 }
2258
2259 for (i = 0, p_ace = the_ace; p_ace; p_ace = p_ace->next, i++ ) {
2260 SMB_ACL_ENTRY_T the_entry;
2261 SMB_ACL_PERMSET_T the_permset;
2262
2263 /*
2264 * ACLs only "need" an ACL_MASK entry if there are any named user or
2265 * named group entries. But if there is an ACL_MASK entry, it applies
2266 * to ACL_USER, ACL_GROUP, and ACL_GROUP_OBJ entries. Set the mask
2267 * so that it doesn't deny (i.e., mask off) any permissions.
2268 */
2269
2270 if (p_ace->type == SMB_ACL_USER || p_ace->type == SMB_ACL_GROUP) {
2271 needs_mask = True;
2272 mask_perms |= p_ace->perms;
2273 } else if (p_ace->type == SMB_ACL_GROUP_OBJ) {
2274 mask_perms |= p_ace->perms;
2275 }
2276
2277 /*
2278 * Get the entry for this ACE.
2279 */
2280
2281 if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &the_acl, &the_entry) == -1) {
2282 DEBUG(0,("set_canon_ace_list: Failed to create entry %d. (%s)\n",
2283 i, strerror(errno) ));
2284 goto done;
2285 }
2286
2287 if (p_ace->type == SMB_ACL_MASK) {
2288 mask_entry = the_entry;
2289 got_mask_entry = True;
2290 }
2291
2292 /*
2293 * Ok - we now know the ACL calls should be working, don't
2294 * allow fallback to chmod.
2295 */
2296
2297 *pacl_set_support = True;
2298
2299 /*
2300 * Initialise the entry from the canon_ace.
2301 */
2302
2303 /*
2304 * First tell the entry what type of ACE this is.
2305 */
2306
2307 if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, the_entry, p_ace->type) == -1) {
2308 DEBUG(0,("set_canon_ace_list: Failed to set tag type on entry %d. (%s)\n",
2309 i, strerror(errno) ));
2310 goto done;
2311 }
2312
2313 /*
2314 * Only set the qualifier (user or group id) if the entry is a user
2315 * or group id ACE.
2316 */
2317
2318 if ((p_ace->type == SMB_ACL_USER) || (p_ace->type == SMB_ACL_GROUP)) {
2319 if (SMB_VFS_SYS_ACL_SET_QUALIFIER(conn, the_entry,(void *)&p_ace->unix_ug.uid) == -1) {
2320 DEBUG(0,("set_canon_ace_list: Failed to set qualifier on entry %d. (%s)\n",
2321 i, strerror(errno) ));
2322 goto done;
2323 }
2324 }
2325
2326 /*
2327 * Convert the mode_t perms in the canon_ace to a POSIX permset.
2328 */
2329
2330 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, the_entry, &the_permset) == -1) {
2331 DEBUG(0,("set_canon_ace_list: Failed to get permset on entry %d. (%s)\n",
2332 i, strerror(errno) ));
2333 goto done;
2334 }
2335
2336 if (map_acl_perms_to_permset(conn, p_ace->perms, &the_permset) == -1) {
2337 DEBUG(0,("set_canon_ace_list: Failed to create permset for mode (%u) on entry %d. (%s)\n",
2338 (unsigned int)p_ace->perms, i, strerror(errno) ));
2339 goto done;
2340 }
2341
2342 /*
2343 * ..and apply them to the entry.
2344 */
2345
2346 if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, the_entry, the_permset) == -1) {
2347 DEBUG(0,("set_canon_ace_list: Failed to add permset on entry %d. (%s)\n",
2348 i, strerror(errno) ));
2349 goto done;
2350 }
2351
2352 if( DEBUGLVL( 10 ))
2353 print_canon_ace( p_ace, i);
2354
2355 }
2356
2357 if (needs_mask && !got_mask_entry) {
2358 if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &the_acl, &mask_entry) == -1) {
2359 DEBUG(0,("set_canon_ace_list: Failed to create mask entry. (%s)\n", strerror(errno) ));
2360 goto done;
2361 }
2362
2363 if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, mask_entry, SMB_ACL_MASK) == -1) {
2364 DEBUG(0,("set_canon_ace_list: Failed to set tag type on mask entry. (%s)\n",strerror(errno) ));
2365 goto done;
2366 }
2367
2368 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, mask_entry, &mask_permset) == -1) {
2369 DEBUG(0,("set_canon_ace_list: Failed to get mask permset. (%s)\n", strerror(errno) ));
2370 goto done;
2371 }
2372
2373 if (map_acl_perms_to_permset(conn, S_IRUSR|S_IWUSR|S_IXUSR, &mask_permset) == -1) {
2374 DEBUG(0,("set_canon_ace_list: Failed to create mask permset. (%s)\n", strerror(errno) ));
2375 goto done;
2376 }
2377
2378 if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, mask_entry, mask_permset) == -1) {
2379 DEBUG(0,("set_canon_ace_list: Failed to add mask permset. (%s)\n", strerror(errno) ));
2380 goto done;
2381 }
2382 }
2383
2384 /*
2385 * Check if the ACL is valid.
2386 */
2387
2388 if (SMB_VFS_SYS_ACL_VALID(conn, the_acl) == -1) {
2389 DEBUG(0,("set_canon_ace_list: ACL type (%s) is invalid for set (%s).\n",
2390 the_acl_type == SMB_ACL_TYPE_DEFAULT ? "directory default" : "file",
2391 strerror(errno) ));
2392 goto done;
2393 }
2394
2395 /*
2396 * Finally apply it to the file or directory.
2397 */
2398
2399 if(default_ace || fsp->is_directory || fsp->fd == -1) {
2400 if (SMB_VFS_SYS_ACL_SET_FILE(conn, fsp->fsp_name, the_acl_type, the_acl) == -1) {
2401 /*
2402 * Some systems allow all the above calls and only fail with no ACL support
2403 * when attempting to apply the acl. HPUX with HFS is an example of this. JRA.
2404 */
2405 if (errno == ENOSYS)
2406 *pacl_set_support = False;
2407
2408 #ifdef ENOTSUP
2409 if (errno == ENOTSUP)
2410 *pacl_set_support = False;
2411 #endif
2412
2413 DEBUG(2,("set_canon_ace_list: sys_acl_set_file type %s failed for file %s (%s).\n",
2414 the_acl_type == SMB_ACL_TYPE_DEFAULT ? "directory default" : "file",
2415 fsp->fsp_name, strerror(errno) ));
2416 goto done;
2417 }
2418 } else {
2419 if (SMB_VFS_SYS_ACL_SET_FD(fsp, fsp->fd, the_acl) == -1) {
2420 /*
2421 * Some systems allow all the above calls and only fail with no ACL support
2422 * when attempting to apply the acl. HPUX with HFS is an example of this. JRA.
2423 */
2424 if (errno == ENOSYS)
2425 *pacl_set_support = False;
2426
2427 #ifdef ENOTSUP
2428 if (errno == ENOTSUP)
2429 *pacl_set_support = False;
2430 #endif
2431
2432 DEBUG(2,("set_canon_ace_list: sys_acl_set_file failed for file %s (%s).\n",
2433 fsp->fsp_name, strerror(errno) ));
2434 goto done;
2435 }
2436 }
2437
2438 ret = True;
2439
2440 done:
2441
2442 if (the_acl != NULL)
2443 SMB_VFS_SYS_ACL_FREE_ACL(conn, the_acl);
2444
2445 return ret;
2446 }
2447
2448 /****************************************************************************
2449 Find a particular canon_ace entry.
2450 ****************************************************************************/
2451
2452 static struct canon_ace *canon_ace_entry_for(struct canon_ace *list, SMB_ACL_TAG_T type, posix_id *id)
2453 {
2454 while (list) {
2455 if (list->type == type && ((type != SMB_ACL_USER && type != SMB_ACL_GROUP) ||
2456 (type == SMB_ACL_USER && id && id->uid == list->unix_ug.uid) ||
2457 (type == SMB_ACL_GROUP && id && id->gid == list->unix_ug.gid)))
2458 break;
2459 list = list->next;
2460 }
2461 return list;
2462 }
2463
2464 /****************************************************************************
2465
2466 ****************************************************************************/
2467
2468 SMB_ACL_T free_empty_sys_acl(connection_struct *conn, SMB_ACL_T the_acl)
2469 {
2470 SMB_ACL_ENTRY_T entry;
2471
2472 if (!the_acl)
2473 return NULL;
2474 if (SMB_VFS_SYS_ACL_GET_ENTRY(conn, the_acl, SMB_ACL_FIRST_ENTRY, &entry) != 1) {
2475 SMB_VFS_SYS_ACL_FREE_ACL(conn, the_acl);
2476 return NULL;
2477 }
2478 return the_acl;
2479 }
2480
2481 /****************************************************************************
2482 Convert a canon_ace to a generic 3 element permission - if possible.
2483 ****************************************************************************/
2484
2485 #define MAP_PERM(p,mask,result) (((p) & (mask)) ? (result) : 0 )
2486
2487 static BOOL convert_canon_ace_to_posix_perms( files_struct *fsp, canon_ace *file_ace_list, mode_t *posix_perms)
2488 {
2489 int snum = SNUM(fsp->conn);
2490 size_t ace_count = count_canon_ace_list(file_ace_list);
2491 canon_ace *ace_p;
2492 canon_ace *owner_ace = NULL;
2493 canon_ace *group_ace = NULL;
2494 canon_ace *other_ace = NULL;
2495 mode_t and_bits;
2496 mode_t or_bits;
2497
2498 if (ace_count != 3) {
2499 DEBUG(3,("convert_canon_ace_to_posix_perms: Too many ACE entries for file %s to convert to \
2500 posix perms.\n", fsp->fsp_name ));
2501 return False;
2502 }
2503
2504 for (ace_p = file_ace_list; ace_p; ace_p = ace_p->next) {
2505 if (ace_p->owner_type == UID_ACE)
2506 owner_ace = ace_p;
2507 else if (ace_p->owner_type == GID_ACE)
2508 group_ace = ace_p;
2509 else if (ace_p->owner_type == WORLD_ACE)
2510 other_ace = ace_p;
2511 }
2512
2513 if (!owner_ace || !group_ace || !other_ace) {
2514 DEBUG(3,("convert_canon_ace_to_posix_perms: Can't get standard entries for file %s.\n",
2515 fsp->fsp_name ));
2516 return False;
2517 }
2518
2519 *posix_perms = (mode_t)0;
2520
2521 *posix_perms |= owner_ace->perms;
2522 *posix_perms |= MAP_PERM(group_ace->perms, S_IRUSR, S_IRGRP);
2523 *posix_perms |= MAP_PERM(group_ace->perms, S_IWUSR, S_IWGRP);
2524 *posix_perms |= MAP_PERM(group_ace->perms, S_IXUSR, S_IXGRP);
2525 *posix_perms |= MAP_PERM(other_ace->perms, S_IRUSR, S_IROTH);
2526 *posix_perms |= MAP_PERM(other_ace->perms, S_IWUSR, S_IWOTH);
2527 *posix_perms |= MAP_PERM(other_ace->perms, S_IXUSR, S_IXOTH);
2528
2529 /* The owner must have at least read access. */
2530
2531 *posix_perms |= S_IRUSR;
2532 if (fsp->is_directory)
2533 *posix_perms |= (S_IWUSR|S_IXUSR);
2534
2535 /* If requested apply the masks. */
2536
2537 /* Get the initial bits to apply. */
2538
2539 if (fsp->is_directory) {
2540 and_bits = lp_dir_security_mask(snum);
2541 or_bits = lp_force_dir_security_mode(snum);
2542 } else {
2543 and_bits = lp_security_mask(snum);
2544 or_bits = lp_force_security_mode(snum);
2545 }
2546
2547 *posix_perms = (((*posix_perms) & and_bits)|or_bits);
2548
2549 DEBUG(10,("convert_canon_ace_to_posix_perms: converted u=%o,g=%o,w=%o to perm=0%o for file %s.\n",
2550 (int)owner_ace->perms, (int)group_ace->perms, (int)other_ace->perms, (int)*posix_perms,
2551 fsp->fsp_name ));
2552
2553 return True;
2554 }
2555
2556 /****************************************************************************
2557 Incoming NT ACLs on a directory can be split into a default POSIX acl (CI|OI|IO) and
2558 a normal POSIX acl. Win2k needs these split acls re-merging into one ACL
2559 with CI|OI set so it is inherited and also applies to the directory.
2560 Based on code from "Jim McDonough" <jmcd@us.ibm.com>.
2561 ****************************************************************************/
2562
2563 static size_t merge_default_aces( SEC_ACE *nt_ace_list, size_t num_aces)
2564 {
2565 size_t i, j;
2566
2567 for (i = 0; i < num_aces; i++) {
2568 for (j = i+1; j < num_aces; j++) {
2569 uint32 i_flags_ni = (nt_ace_list[i].flags & ~SEC_ACE_FLAG_INHERITED_ACE);
2570 uint32 j_flags_ni = (nt_ace_list[j].flags & ~SEC_ACE_FLAG_INHERITED_ACE);
2571 BOOL i_inh = (nt_ace_list[i].flags & SEC_ACE_FLAG_INHERITED_ACE) ? True : False;
2572 BOOL j_inh = (nt_ace_list[j].flags & SEC_ACE_FLAG_INHERITED_ACE) ? True : False;
2573
2574 /* We know the lower number ACE's are file entries. */
2575 if ((nt_ace_list[i].type == nt_ace_list[j].type) &&
2576 (nt_ace_list[i].size == nt_ace_list[j].size) &&
2577 (nt_ace_list[i].info.mask == nt_ace_list[j].info.mask) &&
2578 sid_equal(&nt_ace_list[i].trustee, &nt_ace_list[j].trustee) &&
2579 (i_inh == j_inh) &&
2580 (i_flags_ni == 0) &&
2581 (j_flags_ni == (SEC_ACE_FLAG_OBJECT_INHERIT|
2582 SEC_ACE_FLAG_CONTAINER_INHERIT|
2583 SEC_ACE_FLAG_INHERIT_ONLY))) {
2584 /*
2585 * W2K wants to have access allowed zero access ACE's
2586 * at the end of the list. If the mask is zero, merge
2587 * the non-inherited ACE onto the inherited ACE.
2588 */
2589
2590 if (nt_ace_list[i].info.mask == 0) {
2591 nt_ace_list[j].flags = SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT|
2592 (i_inh ? SEC_ACE_FLAG_INHERITED_ACE : 0);
2593 if (num_aces - i - 1 > 0)
2594 memmove(&nt_ace_list[i], &nt_ace_list[i+1], (num_aces-i-1) *
2595 sizeof(SEC_ACE));
2596
2597 DEBUG(10,("merge_default_aces: Merging zero access ACE %u onto ACE %u.\n",
2598 (unsigned int)i, (unsigned int)j ));
2599 } else {
2600 /*
2601 * These are identical except for the flags.
2602 * Merge the inherited ACE onto the non-inherited ACE.
2603 */
2604
2605 nt_ace_list[i].flags = SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT|
2606 (i_inh ? SEC_ACE_FLAG_INHERITED_ACE : 0);
2607 if (num_aces - j - 1 > 0)
2608 memmove(&nt_ace_list[j], &nt_ace_list[j+1], (num_aces-j-1) *
2609 sizeof(SEC_ACE));
2610
2611 DEBUG(10,("merge_default_aces: Merging ACE %u onto ACE %u.\n",
2612 (unsigned int)j, (unsigned int)i ));
2613 }
2614 num_aces--;
2615 break;
2616 }
2617 }
2618 }
2619
2620 return num_aces;
2621 }
2622 /****************************************************************************
2623 Reply to query a security descriptor from an fsp. If it succeeds it allocates
2624 the space for the return elements and returns the size needed to return the
2625 security descriptor. This should be the only external function needed for
2626 the UNIX style get ACL.
2627 ****************************************************************************/
2628
2629 size_t get_nt_acl(files_struct *fsp, uint32 security_info, SEC_DESC **ppdesc)
2630 {
2631 extern DOM_SID global_sid_Builtin_Administrators;
2632 extern DOM_SID global_sid_Builtin_Users;
2633 extern DOM_SID global_sid_Creator_Owner;
2634 extern DOM_SID global_sid_Creator_Group;
2635 connection_struct *conn = fsp->conn;
2636 SMB_STRUCT_STAT sbuf;
2637 SEC_ACE *nt_ace_list = NULL;
2638 DOM_SID owner_sid;
2639 DOM_SID group_sid;
2640 size_t sd_size = 0;
2641 SEC_ACL *psa = NULL;
2642 size_t num_acls = 0;
2643 size_t num_dir_acls = 0;
2644 size_t num_aces = 0;
2645 SMB_ACL_T posix_acl = NULL;
2646 SMB_ACL_T dir_acl = NULL;
2647 canon_ace *file_ace = NULL;
2648 canon_ace *dir_ace = NULL;
2649 size_t num_profile_acls = 0;
2650 struct pai_val *pal = NULL;
2651 SEC_DESC *psd = NULL;
2652
2653 *ppdesc = NULL;
2654
2655 DEBUG(10,("get_nt_acl: called for file %s\n", fsp->fsp_name ));
2656
2657 if(fsp->is_directory || fsp->fd == -1) {
2658
2659 /* Get the stat struct for the owner info. */
2660 if(SMB_VFS_STAT(fsp->conn,fsp->fsp_name, &sbuf) != 0) {
2661 return 0;
2662 }
2663 /*
2664 * Get the ACL from the path.
2665 */
2666
2667 posix_acl = SMB_VFS_SYS_ACL_GET_FILE(conn, fsp->fsp_name, SMB_ACL_TYPE_ACCESS);
2668
2669 /*
2670 * If it's a directory get the default POSIX ACL.
2671 */
2672
2673 if(fsp->is_directory) {
2674 dir_acl = SMB_VFS_SYS_ACL_GET_FILE(conn, fsp->fsp_name, SMB_ACL_TYPE_DEFAULT);
2675 dir_acl = free_empty_sys_acl(conn, dir_acl);
2676 }
2677
2678 } else {
2679
2680 /* Get the stat struct for the owner info. */
2681 if(SMB_VFS_FSTAT(fsp,fsp->fd,&sbuf) != 0) {
2682 return 0;
2683 }
2684 /*
2685 * Get the ACL from the fd.
2686 */
2687 posix_acl = SMB_VFS_SYS_ACL_GET_FD(fsp, fsp->fd);
2688 }
2689
2690 DEBUG(5,("get_nt_acl : file ACL %s, directory ACL %s\n",
2691 posix_acl ? "present" : "absent",
2692 dir_acl ? "present" : "absent" ));
2693
2694 pal = load_inherited_info(fsp);
2695
2696 /*
2697 * Get the owner, group and world SIDs.
2698 */
2699
2700 if (lp_profile_acls(SNUM(fsp->conn))) {
2701 /* For WXP SP1 the owner must be administrators. */
2702 sid_copy(&owner_sid, &global_sid_Builtin_Administrators);
2703 sid_copy(&group_sid, &global_sid_Builtin_Users);
2704 num_profile_acls = 2;
2705 } else {
2706 create_file_sids(&sbuf, &owner_sid, &group_sid);
2707 }
2708
2709 if ((security_info & DACL_SECURITY_INFORMATION) && !(security_info & PROTECTED_DACL_SECURITY_INFORMATION)) {
2710
2711 /*
2712 * In the optimum case Creator Owner and Creator Group would be used for
2713 * the ACL_USER_OBJ and ACL_GROUP_OBJ entries, respectively, but this
2714 * would lead to usability problems under Windows: The Creator entries
2715 * are only available in browse lists of directories and not for files;
2716 * additionally the identity of the owning group couldn't be determined.
2717 * We therefore use those identities only for Default ACLs.
2718 */
2719
2720 /* Create the canon_ace lists. */
2721 file_ace = canonicalise_acl( fsp, posix_acl, &sbuf, &owner_sid, &group_sid, pal, SMB_ACL_TYPE_ACCESS );
2722
2723 /* We must have *some* ACLS. */
2724
2725 if (count_canon_ace_list(file_ace) == 0) {
2726 DEBUG(0,("get_nt_acl : No ACLs on file (%s) !\n", fsp->fsp_name ));
2727 return 0;
2728 }
2729
2730 if (fsp->is_directory && dir_acl) {
2731 dir_ace = canonicalise_acl(fsp, dir_acl, &sbuf,
2732 &global_sid_Creator_Owner,
2733 &global_sid_Creator_Group, pal, SMB_ACL_TYPE_DEFAULT );
2734 }
2735
2736 /*
2737 * Create the NT ACE list from the canonical ace lists.
2738 */
2739
2740 {
2741 canon_ace *ace;
2742 int nt_acl_type;
2743 int i;
2744
2745 if (nt4_compatible_acls() && dir_ace) {
2746 /*
2747 * NT 4 chokes if an ACL contains an INHERIT_ONLY entry
2748 * but no non-INHERIT_ONLY entry for one SID. So we only
2749 * remove entries from the Access ACL if the
2750 * corresponding Default ACL entries have also been
2751 * removed. ACEs for CREATOR-OWNER and CREATOR-GROUP
2752 * are exceptions. We can do nothing
2753 * intelligent if the Default ACL contains entries that
2754 * are not also contained in the Access ACL, so this
2755 * case will still fail under NT 4.
2756 */
2757
2758 ace = canon_ace_entry_for(dir_ace, SMB_ACL_OTHER, NULL);
2759 if (ace && !ace->perms) {
2760 DLIST_REMOVE(dir_ace, ace);
2761 SAFE_FREE(ace);
2762
2763 ace = canon_ace_entry_for(file_ace, SMB_ACL_OTHER, NULL);
2764 if (ace && !ace->perms) {
2765 DLIST_REMOVE(file_ace, ace);
2766 SAFE_FREE(ace);
2767 }
2768 }
2769
2770 /*
2771 * WinNT doesn't usually have Creator Group
2772 * in browse lists, so we send this entry to
2773 * WinNT even if it contains no relevant
2774 * permissions. Once we can add
2775 * Creator Group to browse lists we can
2776 * re-enable this.
2777 */
2778
2779 #if 0
2780 ace = canon_ace_entry_for(dir_ace, SMB_ACL_GROUP_OBJ, NULL);
2781 if (ace && !ace->perms) {
2782 DLIST_REMOVE(dir_ace, ace);
2783 SAFE_FREE(ace);
2784 }
2785 #endif
2786
2787 ace = canon_ace_entry_for(file_ace, SMB_ACL_GROUP_OBJ, NULL);
2788 if (ace && !ace->perms) {
2789 DLIST_REMOVE(file_ace, ace);
2790 SAFE_FREE(ace);
2791 }
2792 }
2793
2794 num_acls = count_canon_ace_list(file_ace);
2795 num_dir_acls = count_canon_ace_list(dir_ace);
2796
2797 /* Allocate the ace list. */
2798 if ((nt_ace_list = (SEC_ACE *)malloc((num_acls + num_profile_acls + num_dir_acls)* sizeof(SEC_ACE))) == NULL) {
2799 DEBUG(0,("get_nt_acl: Unable to malloc space for nt_ace_list.\n"));
2800 goto done;
2801 }
2802
2803 memset(nt_ace_list, '\0', (num_acls + num_dir_acls) * sizeof(SEC_ACE) );
2804
2805 /*
2806 * Create the NT ACE list from the canonical ace lists.
2807 */
2808
2809 ace = file_ace;
2810
2811 for (i = 0; i < num_acls; i++, ace = ace->next) {
2812 SEC_ACCESS acc;
2813
2814 acc = map_canon_ace_perms(&nt_acl_type, &owner_sid, ace );
2815 init_sec_ace(&nt_ace_list[num_aces++], &ace->trustee, nt_acl_type, acc, ace->inherited ? SEC_ACE_FLAG_INHERITED_ACE : 0);
2816 }
2817
2818 /* The User must have access to a profile share - even if we can't map the SID. */
2819 if (lp_profile_acls(SNUM(fsp->conn))) {
2820 SEC_ACCESS acc;
2821
2822 init_sec_access(&acc,FILE_GENERIC_ALL);
2823 init_sec_ace(&nt_ace_list[num_aces++], &global_sid_Builtin_Users, SEC_ACE_TYPE_ACCESS_ALLOWED,
2824 acc, 0);
2825 }
2826
2827 ace = dir_ace;
2828
2829 for (i = 0; i < num_dir_acls; i++, ace = ace->next) {
2830 SEC_ACCESS acc;
2831
2832 acc = map_canon_ace_perms(&nt_acl_type, &owner_sid, ace );
2833 init_sec_ace(&nt_ace_list[num_aces++], &ace->trustee, nt_acl_type, acc,
2834 SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT|
2835 SEC_ACE_FLAG_INHERIT_ONLY|
2836 (ace->inherited ? SEC_ACE_FLAG_INHERITED_ACE : 0));
2837 }
2838
2839 /* The User must have access to a profile share - even if we can't map the SID. */
2840 if (lp_profile_acls(SNUM(fsp->conn))) {
2841 SEC_ACCESS acc;
2842
2843 init_sec_access(&acc,FILE_GENERIC_ALL);
2844 init_sec_ace(&nt_ace_list[num_aces++], &global_sid_Builtin_Users, SEC_ACE_TYPE_ACCESS_ALLOWED, acc,
2845 SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT|
2846 SEC_ACE_FLAG_INHERIT_ONLY|0);
2847 }
2848
2849 /*
2850 * Merge POSIX default ACLs and normal ACLs into one NT ACE.
2851 * Win2K needs this to get the inheritance correct when replacing ACLs
2852 * on a directory tree. Based on work by Jim @ IBM.
2853 */
2854
2855 num_aces = merge_default_aces(nt_ace_list, num_aces);
2856
2857 }
2858
2859 if (num_aces) {
2860 if((psa = make_sec_acl( main_loop_talloc_get(), ACL_REVISION, num_aces, nt_ace_list)) == NULL) {
2861 DEBUG(0,("get_nt_acl: Unable to malloc space for acl.\n"));
2862 goto done;
2863 }
2864 }
2865 } /* security_info & DACL_SECURITY_INFORMATION */
2866
2867 psd = make_standard_sec_desc( main_loop_talloc_get(),
2868 (security_info & OWNER_SECURITY_INFORMATION) ? &owner_sid : NULL,
2869 (security_info & GROUP_SECURITY_INFORMATION) ? &group_sid : NULL,
2870 psa,
2871 &sd_size);
2872
2873 if(!psd) {
2874 DEBUG(0,("get_nt_acl: Unable to malloc space for security descriptor.\n"));
2875 sd_size = 0;
2876 } else {
2877 /*
2878 * Windows 2000: The DACL_PROTECTED flag in the security
2879 * descriptor marks the ACL as non-inheriting, i.e., no
2880 * ACEs from higher level directories propagate to this
2881 * ACL. In the POSIX ACL model permissions are only
2882 * inherited at file create time, so ACLs never contain
2883 * any ACEs that are inherited dynamically. The DACL_PROTECTED
2884 * flag doesn't seem to bother Windows NT.
2885 */
2886 if (get_protected_flag(pal))
2887 psd->type |= SE_DESC_DACL_PROTECTED;
2888 }
2889
2890 if (psd->dacl)
2891 dacl_sort_into_canonical_order(psd->dacl->ace, (unsigned int)psd->dacl->num_aces);
2892
2893 *ppdesc = psd;
2894
2895 done:
2896
2897 if (posix_acl)
2898 SMB_VFS_SYS_ACL_FREE_ACL(conn, posix_acl);
2899 if (dir_acl)
2900 SMB_VFS_SYS_ACL_FREE_ACL(conn, dir_acl);
2901 free_canon_ace_list(file_ace);
2902 free_canon_ace_list(dir_ace);
2903 free_inherited_info(pal);
2904 SAFE_FREE(nt_ace_list);
2905
2906 return sd_size;
2907 }
2908
2909 /****************************************************************************
2910 Try to chown a file. We will be able to chown it under the following conditions.
2911
2912 1) If we have root privileges, then it will just work.
2913 2) If we have write permission to the file and dos_filemodes is set
2914 then allow chown to the currently authenticated user.
2915 ****************************************************************************/
2916
2917 static int try_chown(connection_struct *conn, const char *fname, uid_t uid, gid_t gid)
2918 {
2919 int ret;
2920 extern struct current_user current_user;
2921 files_struct *fsp;
2922 SMB_STRUCT_STAT st;
2923
2924 /* try the direct way first */
2925 ret = SMB_VFS_CHOWN(conn, fname, uid, gid);
2926 if (ret == 0)
2927 return 0;
2928
2929 if(!CAN_WRITE(conn) || !lp_dos_filemode(SNUM(conn)))
2930 return -1;
2931
2932 if (SMB_VFS_STAT(conn,fname,&st))
2933 return -1;
2934
2935 fsp = open_file_fchmod(conn,fname,&st);
2936 if (!fsp)
2937 return -1;
2938
2939 /* only allow chown to the current user. This is more secure,
2940 and also copes with the case where the SID in a take ownership ACL is
2941 a local SID on the users workstation
2942 */
2943 uid = current_user.uid;
2944
2945 become_root();
2946 /* Keep the current file gid the same. */
2947 ret = SMB_VFS_FCHOWN(fsp, fsp->fd, uid, (gid_t)-1);
2948 unbecome_root();
2949
2950 close_file_fchmod(fsp);
2951
2952 return ret;
2953 }
2954
2955 /****************************************************************************
2956 Reply to set a security descriptor on an fsp. security_info_sent is the
2957 description of the following NT ACL.
2958 This should be the only external function needed for the UNIX style set ACL.
2959 ****************************************************************************/
2960
2961 BOOL set_nt_acl(files_struct *fsp, uint32 security_info_sent, SEC_DESC *psd)
2962 {
2963 connection_struct *conn = fsp->conn;
2964 uid_t user = (uid_t)-1;
2965 gid_t grp = (gid_t)-1;
2966 SMB_STRUCT_STAT sbuf;
2967 DOM_SID file_owner_sid;
2968 DOM_SID file_grp_sid;
2969 canon_ace *file_ace_list = NULL;
2970 canon_ace *dir_ace_list = NULL;
2971 BOOL acl_perms = False;
2972 mode_t orig_mode = (mode_t)0;
2973 uid_t orig_uid;
2974 gid_t orig_gid;
2975 BOOL need_chown = False;
2976 extern struct current_user current_user;
2977
2978 DEBUG(10,("set_nt_acl: called for file %s\n", fsp->fsp_name ));
2979
2980 if (!CAN_WRITE(conn)) {
2981 DEBUG(10,("set acl rejected on read-only share\n"));
2982 return False;
2983 }
2984
2985 /*
2986 * Get the current state of the file.
2987 */
2988
2989 if(fsp->is_directory || fsp->fd == -1) {
2990 if(SMB_VFS_STAT(fsp->conn,fsp->fsp_name, &sbuf) != 0)
2991 return False;
2992 } else {
2993 if(SMB_VFS_FSTAT(fsp,fsp->fd,&sbuf) != 0)
2994 return False;
2995 }
2996
2997 /* Save the original elements we check against. */
2998 orig_mode = sbuf.st_mode;
2999 orig_uid = sbuf.st_uid;
3000 orig_gid = sbuf.st_gid;
3001
3002 /*
3003 * Unpack the user/group/world id's.
3004 */
3005
3006 if (!unpack_nt_owners( &sbuf, &user, &grp, security_info_sent, psd))
3007 return False;
3008
3009 /*
3010 * Do we need to chown ?
3011 */
3012
3013 if (((user != (uid_t)-1) && (orig_uid != user)) || (( grp != (gid_t)-1) && (orig_gid != grp)))
3014 need_chown = True;
3015
3016 /*
3017 * Chown before setting ACL only if we don't change the user, or
3018 * if we change to the current user, but not if we want to give away
3019 * the file.
3020 */
3021
3022 if (need_chown && (user == (uid_t)-1 || user == current_user.uid)) {
3023
3024 DEBUG(3,("set_nt_acl: chown %s. uid = %u, gid = %u.\n",
3025 fsp->fsp_name, (unsigned int)user, (unsigned int)grp ));
3026
3027 if(try_chown( fsp->conn, fsp->fsp_name, user, grp) == -1) {
3028 DEBUG(3,("set_nt_acl: chown %s, %u, %u failed. Error = %s.\n",
3029 fsp->fsp_name, (unsigned int)user, (unsigned int)grp, strerror(errno) ));
3030 return False;
3031 }
3032
3033 /*
3034 * Recheck the current state of the file, which may have changed.
3035 * (suid/sgid bits, for instance)
3036 */
3037
3038 if(fsp->is_directory) {
3039 if(SMB_VFS_STAT(fsp->conn, fsp->fsp_name, &sbuf) != 0) {
3040 return False;
3041 }
3042 } else {
3043
3044 int ret;
3045
3046 if(fsp->fd == -1)
3047 ret = SMB_VFS_STAT(fsp->conn, fsp->fsp_name, &sbuf);
3048 else
3049 ret = SMB_VFS_FSTAT(fsp,fsp->fd,&sbuf);
3050
3051 if(ret != 0)
3052 return False;
3053 }
3054
3055 /* Save the original elements we check against. */
3056 orig_mode = sbuf.st_mode;
3057 orig_uid = sbuf.st_uid;
3058 orig_gid = sbuf.st_gid;
3059
3060 /* We did it, don't try again */
3061 need_chown = False;
3062 }
3063
3064 create_file_sids(&sbuf, &file_owner_sid, &file_grp_sid);
3065
3066 acl_perms = unpack_canon_ace( fsp, &sbuf, &file_owner_sid, &file_grp_sid,
3067 &file_ace_list, &dir_ace_list, security_info_sent, psd);
3068
3069 /* Ignore W2K traverse DACL set. */
3070 if (file_ace_list || dir_ace_list) {
3071
3072 if (!acl_perms) {
3073 DEBUG(3,("set_nt_acl: cannot set permissions\n"));
3074 free_canon_ace_list(file_ace_list);
3075 free_canon_ace_list(dir_ace_list);
3076 return False;
3077 }
3078
3079 /*
3080 * Only change security if we got a DACL.
3081 */
3082
3083 if((security_info_sent & DACL_SECURITY_INFORMATION) && (psd->dacl != NULL)) {
3084
3085 BOOL acl_set_support = False;
3086 BOOL ret = False;
3087
3088 /*
3089 * Try using the POSIX ACL set first. Fall back to chmod if
3090 * we have no ACL support on this filesystem.
3091 */
3092
3093 if (acl_perms && file_ace_list) {
3094 ret = set_canon_ace_list(fsp, file_ace_list, False, &acl_set_support);
3095 if (acl_set_support && ret == False) {
3096 DEBUG(3,("set_nt_acl: failed to set file acl on file %s (%s).\n", fsp->fsp_name, strerror(errno) ));
3097 free_canon_ace_list(file_ace_list);
3098 free_canon_ace_list(dir_ace_list);
3099 return False;
3100 }
3101 }
3102
3103 if (acl_perms && acl_set_support && fsp->is_directory) {
3104 if (dir_ace_list) {
3105 if (!set_canon_ace_list(fsp, dir_ace_list, True, &acl_set_support)) {
3106 DEBUG(3,("set_nt_acl: failed to set default acl on directory %s (%s).\n", fsp->fsp_name, strerror(errno) ));
3107 free_canon_ace_list(file_ace_list);
3108 free_canon_ace_list(dir_ace_list);
3109 return False;
3110 }
3111 } else {
3112
3113 /*
3114 * No default ACL - delete one if it exists.
3115 */
3116
3117 if (SMB_VFS_SYS_ACL_DELETE_DEF_FILE(conn, fsp->fsp_name) == -1) {
3118 DEBUG(3,("set_nt_acl: sys_acl_delete_def_file failed (%s)\n", strerror(errno)));
3119 free_canon_ace_list(file_ace_list);
3120 free_canon_ace_list(dir_ace_list);
3121 return False;
3122 }
3123 }
3124 }
3125
3126 if (acl_set_support)
3127 store_inheritance_attributes(fsp, file_ace_list, dir_ace_list,
3128 (psd->type & SE_DESC_DACL_PROTECTED) ? True : False);
3129
3130 /*
3131 * If we cannot set using POSIX ACLs we fall back to checking if we need to chmod.
3132 */
3133
3134 if(!acl_set_support && acl_perms) {
3135 mode_t posix_perms;
3136
3137 if (!convert_canon_ace_to_posix_perms( fsp, file_ace_list, &posix_perms)) {
3138 free_canon_ace_list(file_ace_list);
3139 free_canon_ace_list(dir_ace_list);
3140 DEBUG(3,("set_nt_acl: failed to convert file acl to posix permissions for file %s.\n",
3141 fsp->fsp_name ));
3142 return False;
3143 }
3144
3145 if (orig_mode != posix_perms) {
3146
3147 DEBUG(3,("set_nt_acl: chmod %s. perms = 0%o.\n",
3148 fsp->fsp_name, (unsigned int)posix_perms ));
3149
3150 if(SMB_VFS_CHMOD(conn,fsp->fsp_name, posix_perms) == -1) {
3151 DEBUG(3,("set_nt_acl: chmod %s, 0%o failed. Error = %s.\n",
3152 fsp->fsp_name, (unsigned int)posix_perms, strerror(errno) ));
3153 free_canon_ace_list(file_ace_list);
3154 free_canon_ace_list(dir_ace_list);
3155 return False;
3156 }
3157 }
3158 }
3159 }
3160
3161 free_canon_ace_list(file_ace_list);
3162 free_canon_ace_list(dir_ace_list);
3163 }
3164
3165 /* Any chown pending? */
3166 if (need_chown) {
3167
3168 DEBUG(3,("set_nt_acl: chown %s. uid = %u, gid = %u.\n",
3169 fsp->fsp_name, (unsigned int)user, (unsigned int)grp ));
3170
3171 if(try_chown( fsp->conn, fsp->fsp_name, user, grp) == -1) {
3172 DEBUG(3,("set_nt_acl: chown %s, %u, %u failed. Error = %s.\n",
3173 fsp->fsp_name, (unsigned int)user, (unsigned int)grp, strerror(errno) ));
3174 return False;
3175 }
3176 }
3177
3178 return True;
3179 }
3180
3181 /****************************************************************************
3182 Get the actual group bits stored on a file with an ACL. Has no effect if
3183 the file has no ACL. Needed in dosmode code where the stat() will return
3184 the mask bits, not the real group bits, for a file with an ACL.
3185 ****************************************************************************/
3186
3187 int get_acl_group_bits( connection_struct *conn, const char *fname, mode_t *mode )
3188 {
3189 int entry_id = SMB_ACL_FIRST_ENTRY;
3190 SMB_ACL_ENTRY_T entry;
3191 SMB_ACL_T posix_acl;
3192
3193 posix_acl = SMB_VFS_SYS_ACL_GET_FILE(conn, fname, SMB_ACL_TYPE_ACCESS);
3194 if (posix_acl == (SMB_ACL_T)NULL)
3195 return -1;
3196
3197 while (SMB_VFS_SYS_ACL_GET_ENTRY(conn, posix_acl, entry_id, &entry) == 1) {
3198 SMB_ACL_TAG_T tagtype;
3199 SMB_ACL_PERMSET_T permset;
3200
3201 /* get_next... */
3202 if (entry_id == SMB_ACL_FIRST_ENTRY)
3203 entry_id = SMB_ACL_NEXT_ENTRY;
3204
3205 if (SMB_VFS_SYS_ACL_GET_TAG_TYPE(conn, entry, &tagtype) ==-1)
3206 return -1;
3207
3208 if (tagtype == SMB_ACL_GROUP_OBJ) {
3209 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, entry, &permset) == -1) {
3210 return -1;
3211 } else {
3212 *mode &= ~(S_IRGRP|S_IWGRP|S_IXGRP);
3213 *mode |= (SMB_VFS_SYS_ACL_GET_PERM(conn, permset, SMB_ACL_READ) ? S_IRGRP : 0);
3214 *mode |= (SMB_VFS_SYS_ACL_GET_PERM(conn, permset, SMB_ACL_WRITE) ? S_IWGRP : 0);
3215 *mode |= (SMB_VFS_SYS_ACL_GET_PERM(conn, permset, SMB_ACL_EXECUTE) ? S_IXGRP : 0);
3216 return 0;;
3217 }
3218 }
3219 }
3220 return -1;
3221 }
3222
3223 /****************************************************************************
3224 Do a chmod by setting the ACL USER_OBJ, GROUP_OBJ and OTHER bits in an ACL
3225 and set the mask to rwx. Needed to preserve complex ACLs set by NT.
3226 ****************************************************************************/
3227
3228 static int chmod_acl_internals( connection_struct *conn, SMB_ACL_T posix_acl, mode_t mode)
3229 {
3230 int entry_id = SMB_ACL_FIRST_ENTRY;
3231 SMB_ACL_ENTRY_T entry;
3232 int num_entries = 0;
3233
3234 while ( SMB_VFS_SYS_ACL_GET_ENTRY(conn, posix_acl, entry_id, &entry) == 1) {
3235 SMB_ACL_TAG_T tagtype;
3236 SMB_ACL_PERMSET_T permset;
3237 mode_t perms;
3238
3239 /* get_next... */
3240 if (entry_id == SMB_ACL_FIRST_ENTRY)
3241 entry_id = SMB_ACL_NEXT_ENTRY;
3242
3243 if (SMB_VFS_SYS_ACL_GET_TAG_TYPE(conn, entry, &tagtype) == -1)
3244 return -1;
3245
3246 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, entry, &permset) == -1)
3247 return -1;
3248
3249 num_entries++;
3250
3251 switch(tagtype) {
3252 case SMB_ACL_USER_OBJ:
3253 perms = unix_perms_to_acl_perms(mode, S_IRUSR, S_IWUSR, S_IXUSR);
3254 break;
3255 case SMB_ACL_GROUP_OBJ:
3256 perms = unix_perms_to_acl_perms(mode, S_IRGRP, S_IWGRP, S_IXGRP);
3257 break;
3258 case SMB_ACL_MASK:
3259 /*
3260 * FIXME: The ACL_MASK entry permissions should really be set to
3261 * the union of the permissions of all ACL_USER,
3262 * ACL_GROUP_OBJ, and ACL_GROUP entries. That's what
3263 * acl_calc_mask() does, but Samba ACLs doesn't provide it.
3264 */
3265 perms = S_IRUSR|S_IWUSR|S_IXUSR;
3266 break;
3267 case SMB_ACL_OTHER:
3268 perms = unix_perms_to_acl_perms(mode, S_IROTH, S_IWOTH, S_IXOTH);
3269 break;
3270 default:
3271 continue;
3272 }
3273
3274 if (map_acl_perms_to_permset(conn, perms, &permset) == -1)
3275 return -1;
3276
3277 if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, entry, permset) == -1)
3278 return -1;
3279 }
3280
3281 /*
3282 * If this is a simple 3 element ACL or no elements then it's a standard
3283 * UNIX permission set. Just use chmod...
3284 */
3285
3286 if ((num_entries == 3) || (num_entries == 0))
3287 return -1;
3288
3289 return 0;
3290 }
3291
3292 /****************************************************************************
3293 Get the access ACL of FROM, do a chmod by setting the ACL USER_OBJ,
3294 GROUP_OBJ and OTHER bits in an ACL and set the mask to rwx. Set the
3295 resulting ACL on TO. Note that name is in UNIX character set.
3296 ****************************************************************************/
3297
3298 static int copy_access_acl(connection_struct *conn, const char *from, const char *to, mode_t mode)
3299 {
3300 SMB_ACL_T posix_acl = NULL;
3301 int ret = -1;
3302
3303 if ((posix_acl = SMB_VFS_SYS_ACL_GET_FILE(conn, from, SMB_ACL_TYPE_ACCESS)) == NULL)
3304 return -1;
3305
3306 if ((ret = chmod_acl_internals(conn, posix_acl, mode)) == -1)
3307 goto done;
3308
3309 ret = SMB_VFS_SYS_ACL_SET_FILE(conn, to, SMB_ACL_TYPE_ACCESS, posix_acl);
3310
3311 done:
3312
3313 SMB_VFS_SYS_ACL_FREE_ACL(conn, posix_acl);
3314 return ret;
3315 }
3316
3317 /****************************************************************************
3318 Do a chmod by setting the ACL USER_OBJ, GROUP_OBJ and OTHER bits in an ACL
3319 and set the mask to rwx. Needed to preserve complex ACLs set by NT.
3320 Note that name is in UNIX character set.
3321 ****************************************************************************/
3322
3323 int chmod_acl(connection_struct *conn, const char *name, mode_t mode)
3324 {
3325 return copy_access_acl(conn, name, name, mode);
3326 }
3327
3328 /****************************************************************************
3329 If "inherit permissions" is set and the parent directory has no default
3330 ACL but it does have an Access ACL, inherit this Access ACL to file name.
3331 ****************************************************************************/
3332
3333 int inherit_access_acl(connection_struct *conn, const char *name, mode_t mode)
3334 {
3335 pstring dirname;
3336 pstrcpy(dirname, parent_dirname(name));
3337
3338 if (!lp_inherit_perms(SNUM(conn)) || directory_has_default_acl(conn, dirname))
3339 return 0;
3340
3341 return copy_access_acl(conn, dirname, name, mode);
3342 }
3343
3344 /****************************************************************************
3345 Do an fchmod by setting the ACL USER_OBJ, GROUP_OBJ and OTHER bits in an ACL
3346 and set the mask to rwx. Needed to preserve complex ACLs set by NT.
3347 ****************************************************************************/
3348
3349 int fchmod_acl(files_struct *fsp, int fd, mode_t mode)
3350 {
3351 connection_struct *conn = fsp->conn;
3352 SMB_ACL_T posix_acl = NULL;
3353 int ret = -1;
3354
3355 if ((posix_acl = SMB_VFS_SYS_ACL_GET_FD(fsp, fd)) == NULL)
3356 return -1;
3357
3358 if ((ret = chmod_acl_internals(conn, posix_acl, mode)) == -1)
3359 goto done;
3360
3361 ret = SMB_VFS_SYS_ACL_SET_FD(fsp, fd, posix_acl);
3362
3363 done:
3364
3365 SMB_VFS_SYS_ACL_FREE_ACL(conn, posix_acl);
3366 return ret;
3367 }
3368
3369 /****************************************************************************
3370 Check for an existing default POSIX ACL on a directory.
3371 ****************************************************************************/
3372
3373 BOOL directory_has_default_acl(connection_struct *conn, const char *fname)
3374 {
3375 SMB_ACL_T dir_acl = SMB_VFS_SYS_ACL_GET_FILE( conn, fname, SMB_ACL_TYPE_DEFAULT);
3376 BOOL has_acl = False;
3377 SMB_ACL_ENTRY_T entry;
3378
3379 if (dir_acl != NULL && (SMB_VFS_SYS_ACL_GET_ENTRY(conn, dir_acl, SMB_ACL_FIRST_ENTRY, &entry) == 1))
3380 has_acl = True;
3381
3382 if (dir_acl)
3383 SMB_VFS_SYS_ACL_FREE_ACL(conn, dir_acl);
3384 return has_acl;
3385 }
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