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r3773: more low-risk or critical changes from 3.0
[Samba.git] / source / smbd / posix_acls.c
blob0ba4437303de61236657f643a435f127704bc6fc
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 = file_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 = dir_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 && !no_acl_syscall_error(errno))
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(int snum, 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 (lp_force_unknown_acl_user(snum)) {
914 /* this allows take ownership to work
915 * reasonably */
916 extern struct current_user current_user;
917 *puser = current_user.uid;
918 } else {
919 DEBUG(3,("unpack_nt_owners: unable to validate"
920 " owner sid for %s\n",
921 sid_string_static(&owner_sid)));
922 return False;
923 }
924 }
925 }
926
927 /*
928 * Don't immediately fail if the group sid cannot be validated.
929 * This may be an owner chown only set.
930 */
931
932 if (security_info_sent & GROUP_SECURITY_INFORMATION) {
933 sid_copy(&grp_sid, psd->grp_sid);
934 if (!NT_STATUS_IS_OK(sid_to_gid( &grp_sid, pgrp))) {
935 if (lp_force_unknown_acl_user(snum)) {
936 /* this allows take group ownership to work
937 * reasonably */
938 extern struct current_user current_user;
939 *pgrp = current_user.gid;
940 } else {
941 DEBUG(3,("unpack_nt_owners: unable to validate"
942 " group sid.\n"));
943 return False;
944 }
945 }
946 }
947
948 DEBUG(5,("unpack_nt_owners: owner_sids validated.\n"));
949
950 return True;
951 }
952
953 /****************************************************************************
954 Ensure the enforced permissions for this share apply.
955 ****************************************************************************/
956
957 static void apply_default_perms(files_struct *fsp, canon_ace *pace, mode_t type)
958 {
959 int snum = SNUM(fsp->conn);
960 mode_t and_bits = (mode_t)0;
961 mode_t or_bits = (mode_t)0;
962
963 /* Get the initial bits to apply. */
964
965 if (fsp->is_directory) {
966 and_bits = lp_dir_security_mask(snum);
967 or_bits = lp_force_dir_security_mode(snum);
968 } else {
969 and_bits = lp_security_mask(snum);
970 or_bits = lp_force_security_mode(snum);
971 }
972
973 /* Now bounce them into the S_USR space. */
974 switch(type) {
975 case S_IRUSR:
976 /* Ensure owner has read access. */
977 pace->perms |= S_IRUSR;
978 if (fsp->is_directory)
979 pace->perms |= (S_IWUSR|S_IXUSR);
980 and_bits = unix_perms_to_acl_perms(and_bits, S_IRUSR, S_IWUSR, S_IXUSR);
981 or_bits = unix_perms_to_acl_perms(or_bits, S_IRUSR, S_IWUSR, S_IXUSR);
982 break;
983 case S_IRGRP:
984 and_bits = unix_perms_to_acl_perms(and_bits, S_IRGRP, S_IWGRP, S_IXGRP);
985 or_bits = unix_perms_to_acl_perms(or_bits, S_IRGRP, S_IWGRP, S_IXGRP);
986 break;
987 case S_IROTH:
988 and_bits = unix_perms_to_acl_perms(and_bits, S_IROTH, S_IWOTH, S_IXOTH);
989 or_bits = unix_perms_to_acl_perms(or_bits, S_IROTH, S_IWOTH, S_IXOTH);
990 break;
991 }
992
993 pace->perms = ((pace->perms & and_bits)|or_bits);
994 }
995
996 /****************************************************************************
997 Check if a given uid/SID is in a group gid/SID. This is probably very
998 expensive and will need optimisation. A *lot* of optimisation :-). JRA.
999 ****************************************************************************/
1000
1001 static BOOL uid_entry_in_group( canon_ace *uid_ace, canon_ace *group_ace )
1002 {
1003 extern DOM_SID global_sid_World;
1004 fstring u_name;
1005 fstring g_name;
1006 extern struct current_user current_user;
1007
1008 /* "Everyone" always matches every uid. */
1009
1010 if (sid_equal(&group_ace->trustee, &global_sid_World))
1011 return True;
1012
1013 /* Assume that the current user is in the current group (force group) */
1014
1015 if (uid_ace->unix_ug.uid == current_user.uid && group_ace->unix_ug.gid == current_user.gid)
1016 return True;
1017
1018 fstrcpy(u_name, uidtoname(uid_ace->unix_ug.uid));
1019 fstrcpy(g_name, gidtoname(group_ace->unix_ug.gid));
1020
1021 /*
1022 * Due to the winbind interfaces we need to do this via names,
1023 * not uids/gids.
1024 */
1025
1026 return user_in_group_list(u_name, g_name, NULL, 0);
1027 }
1028
1029 /****************************************************************************
1030 A well formed POSIX file or default ACL has at least 3 entries, a
1031 SMB_ACL_USER_OBJ, SMB_ACL_GROUP_OBJ, SMB_ACL_OTHER_OBJ.
1032 In addition, the owner must always have at least read access.
1033 When using this call on get_acl, the pst struct is valid and contains
1034 the mode of the file. When using this call on set_acl, the pst struct has
1035 been modified to have a mode containing the default for this file or directory
1036 type.
1037 ****************************************************************************/
1038
1039 static BOOL ensure_canon_entry_valid(canon_ace **pp_ace,
1040 files_struct *fsp,
1041 DOM_SID *pfile_owner_sid,
1042 DOM_SID *pfile_grp_sid,
1043 SMB_STRUCT_STAT *pst,
1044 BOOL setting_acl)
1045 {
1046 extern DOM_SID global_sid_World;
1047 canon_ace *pace;
1048 BOOL got_user = False;
1049 BOOL got_grp = False;
1050 BOOL got_other = False;
1051 canon_ace *pace_other = NULL;
1052 canon_ace *pace_group = NULL;
1053
1054 for (pace = *pp_ace; pace; pace = pace->next) {
1055 if (pace->type == SMB_ACL_USER_OBJ) {
1056
1057 if (setting_acl)
1058 apply_default_perms(fsp, pace, S_IRUSR);
1059 got_user = True;
1060
1061 } else if (pace->type == SMB_ACL_GROUP_OBJ) {
1062
1063 /*
1064 * Ensure create mask/force create mode is respected on set.
1065 */
1066
1067 if (setting_acl)
1068 apply_default_perms(fsp, pace, S_IRGRP);
1069 got_grp = True;
1070 pace_group = pace;
1071
1072 } else if (pace->type == SMB_ACL_OTHER) {
1073
1074 /*
1075 * Ensure create mask/force create mode is respected on set.
1076 */
1077
1078 if (setting_acl)
1079 apply_default_perms(fsp, pace, S_IROTH);
1080 got_other = True;
1081 pace_other = pace;
1082 }
1083 }
1084
1085 if (!got_user) {
1086 if ((pace = (canon_ace *)malloc(sizeof(canon_ace))) == NULL) {
1087 DEBUG(0,("ensure_canon_entry_valid: malloc fail.\n"));
1088 return False;
1089 }
1090
1091 ZERO_STRUCTP(pace);
1092 pace->type = SMB_ACL_USER_OBJ;
1093 pace->owner_type = UID_ACE;
1094 pace->unix_ug.uid = pst->st_uid;
1095 pace->trustee = *pfile_owner_sid;
1096 pace->attr = ALLOW_ACE;
1097
1098 if (setting_acl) {
1099 /* If we only got an "everyone" perm, just use that. */
1100 if (!got_grp && got_other)
1101 pace->perms = pace_other->perms;
1102 else if (got_grp && uid_entry_in_group(pace, pace_group))
1103 pace->perms = pace_group->perms;
1104 else
1105 pace->perms = 0;
1106
1107 apply_default_perms(fsp, pace, S_IRUSR);
1108 } else {
1109 pace->perms = unix_perms_to_acl_perms(pst->st_mode, S_IRUSR, S_IWUSR, S_IXUSR);
1110 }
1111
1112 DLIST_ADD(*pp_ace, pace);
1113 }
1114
1115 if (!got_grp) {
1116 if ((pace = (canon_ace *)malloc(sizeof(canon_ace))) == NULL) {
1117 DEBUG(0,("ensure_canon_entry_valid: malloc fail.\n"));
1118 return False;
1119 }
1120
1121 ZERO_STRUCTP(pace);
1122 pace->type = SMB_ACL_GROUP_OBJ;
1123 pace->owner_type = GID_ACE;
1124 pace->unix_ug.uid = pst->st_gid;
1125 pace->trustee = *pfile_grp_sid;
1126 pace->attr = ALLOW_ACE;
1127 if (setting_acl) {
1128 /* If we only got an "everyone" perm, just use that. */
1129 if (got_other)
1130 pace->perms = pace_other->perms;
1131 else
1132 pace->perms = 0;
1133 apply_default_perms(fsp, pace, S_IRGRP);
1134 } else {
1135 pace->perms = unix_perms_to_acl_perms(pst->st_mode, S_IRGRP, S_IWGRP, S_IXGRP);
1136 }
1137
1138 DLIST_ADD(*pp_ace, pace);
1139 }
1140
1141 if (!got_other) {
1142 if ((pace = (canon_ace *)malloc(sizeof(canon_ace))) == NULL) {
1143 DEBUG(0,("ensure_canon_entry_valid: malloc fail.\n"));
1144 return False;
1145 }
1146
1147 ZERO_STRUCTP(pace);
1148 pace->type = SMB_ACL_OTHER;
1149 pace->owner_type = WORLD_ACE;
1150 pace->unix_ug.world = -1;
1151 pace->trustee = global_sid_World;
1152 pace->attr = ALLOW_ACE;
1153 if (setting_acl) {
1154 pace->perms = 0;
1155 apply_default_perms(fsp, pace, S_IROTH);
1156 } else
1157 pace->perms = unix_perms_to_acl_perms(pst->st_mode, S_IROTH, S_IWOTH, S_IXOTH);
1158
1159 DLIST_ADD(*pp_ace, pace);
1160 }
1161
1162 return True;
1163 }
1164
1165 /****************************************************************************
1166 Check if a POSIX ACL has the required SMB_ACL_USER_OBJ and SMB_ACL_GROUP_OBJ entries.
1167 If it does not have them, check if there are any entries where the trustee is the
1168 file owner or the owning group, and map these to SMB_ACL_USER_OBJ and SMB_ACL_GROUP_OBJ.
1169 ****************************************************************************/
1170
1171 static void check_owning_objs(canon_ace *ace, DOM_SID *pfile_owner_sid, DOM_SID *pfile_grp_sid)
1172 {
1173 BOOL got_user_obj, got_group_obj;
1174 canon_ace *current_ace;
1175 int i, entries;
1176
1177 entries = count_canon_ace_list(ace);
1178 got_user_obj = False;
1179 got_group_obj = False;
1180
1181 for (i=0, current_ace = ace; i < entries; i++, current_ace = current_ace->next) {
1182 if (current_ace->type == SMB_ACL_USER_OBJ)
1183 got_user_obj = True;
1184 else if (current_ace->type == SMB_ACL_GROUP_OBJ)
1185 got_group_obj = True;
1186 }
1187 if (got_user_obj && got_group_obj) {
1188 DEBUG(10,("check_owning_objs: ACL had owning user/group entries.\n"));
1189 return;
1190 }
1191
1192 for (i=0, current_ace = ace; i < entries; i++, current_ace = current_ace->next) {
1193 if (!got_user_obj && current_ace->owner_type == UID_ACE &&
1194 sid_equal(&current_ace->trustee, pfile_owner_sid)) {
1195 current_ace->type = SMB_ACL_USER_OBJ;
1196 got_user_obj = True;
1197 }
1198 if (!got_group_obj && current_ace->owner_type == GID_ACE &&
1199 sid_equal(&current_ace->trustee, pfile_grp_sid)) {
1200 current_ace->type = SMB_ACL_GROUP_OBJ;
1201 got_group_obj = True;
1202 }
1203 }
1204 if (!got_user_obj)
1205 DEBUG(10,("check_owning_objs: ACL is missing an owner entry.\n"));
1206 if (!got_group_obj)
1207 DEBUG(10,("check_owning_objs: ACL is missing an owning group entry.\n"));
1208 }
1209
1210 /****************************************************************************
1211 Unpack a SEC_DESC into two canonical ace lists.
1212 ****************************************************************************/
1213
1214 static BOOL create_canon_ace_lists(files_struct *fsp, SMB_STRUCT_STAT *pst,
1215 DOM_SID *pfile_owner_sid,
1216 DOM_SID *pfile_grp_sid,
1217 canon_ace **ppfile_ace, canon_ace **ppdir_ace,
1218 SEC_ACL *dacl)
1219 {
1220 extern DOM_SID global_sid_Creator_Owner;
1221 extern DOM_SID global_sid_Creator_Group;
1222 extern DOM_SID global_sid_World;
1223 extern struct generic_mapping file_generic_mapping;
1224 BOOL all_aces_are_inherit_only = (fsp->is_directory ? True : False);
1225 canon_ace *file_ace = NULL;
1226 canon_ace *dir_ace = NULL;
1227 canon_ace *tmp_ace = NULL;
1228 canon_ace *current_ace = NULL;
1229 BOOL got_dir_allow = False;
1230 BOOL got_file_allow = False;
1231 int i, j;
1232
1233 *ppfile_ace = NULL;
1234 *ppdir_ace = NULL;
1235
1236 /*
1237 * Convert the incoming ACL into a more regular form.
1238 */
1239
1240 for(i = 0; i < dacl->num_aces; i++) {
1241 SEC_ACE *psa = &dacl->ace[i];
1242
1243 if((psa->type != SEC_ACE_TYPE_ACCESS_ALLOWED) && (psa->type != SEC_ACE_TYPE_ACCESS_DENIED)) {
1244 DEBUG(3,("create_canon_ace_lists: unable to set anything but an ALLOW or DENY ACE.\n"));
1245 return False;
1246 }
1247
1248 if (nt4_compatible_acls()) {
1249 /*
1250 * The security mask may be UNIX_ACCESS_NONE which should map into
1251 * no permissions (we overload the WRITE_OWNER bit for this) or it
1252 * should be one of the ALL/EXECUTE/READ/WRITE bits. Arrange for this
1253 * to be so. Any other bits override the UNIX_ACCESS_NONE bit.
1254 */
1255
1256 /*
1257 * Convert GENERIC bits to specific bits.
1258 */
1259
1260 se_map_generic(&psa->info.mask, &file_generic_mapping);
1261
1262 psa->info.mask &= (UNIX_ACCESS_NONE|FILE_ALL_ACCESS);
1263
1264 if(psa->info.mask != UNIX_ACCESS_NONE)
1265 psa->info.mask &= ~UNIX_ACCESS_NONE;
1266 }
1267 }
1268
1269 /*
1270 * Deal with the fact that NT 4.x re-writes the canonical format
1271 * that we return for default ACLs. If a directory ACE is identical
1272 * to a inherited directory ACE then NT changes the bits so that the
1273 * first ACE is set to OI|IO and the second ACE for this SID is set
1274 * to CI. We need to repair this. JRA.
1275 */
1276
1277 for(i = 0; i < dacl->num_aces; i++) {
1278 SEC_ACE *psa1 = &dacl->ace[i];
1279
1280 for (j = i + 1; j < dacl->num_aces; j++) {
1281 SEC_ACE *psa2 = &dacl->ace[j];
1282
1283 if (psa1->info.mask != psa2->info.mask)
1284 continue;
1285
1286 if (!sid_equal(&psa1->trustee, &psa2->trustee))
1287 continue;
1288
1289 /*
1290 * Ok - permission bits and SIDs are equal.
1291 * Check if flags were re-written.
1292 */
1293
1294 if (psa1->flags & SEC_ACE_FLAG_INHERIT_ONLY) {
1295
1296 psa1->flags |= (psa2->flags & (SEC_ACE_FLAG_CONTAINER_INHERIT|SEC_ACE_FLAG_OBJECT_INHERIT));
1297 psa2->flags &= ~(SEC_ACE_FLAG_CONTAINER_INHERIT|SEC_ACE_FLAG_OBJECT_INHERIT);
1298
1299 } else if (psa2->flags & SEC_ACE_FLAG_INHERIT_ONLY) {
1300
1301 psa2->flags |= (psa1->flags & (SEC_ACE_FLAG_CONTAINER_INHERIT|SEC_ACE_FLAG_OBJECT_INHERIT));
1302 psa1->flags &= ~(SEC_ACE_FLAG_CONTAINER_INHERIT|SEC_ACE_FLAG_OBJECT_INHERIT);
1303
1304 }
1305 }
1306 }
1307
1308 for(i = 0; i < dacl->num_aces; i++) {
1309 SEC_ACE *psa = &dacl->ace[i];
1310
1311 /*
1312 * Ignore non-mappable SIDs (NT Authority, BUILTIN etc).
1313 */
1314
1315 if (non_mappable_sid(&psa->trustee)) {
1316 fstring str;
1317 DEBUG(10,("create_canon_ace_lists: ignoring non-mappable SID %s\n",
1318 sid_to_string(str, &psa->trustee) ));
1319 continue;
1320 }
1321
1322 /*
1323 * Create a cannon_ace entry representing this NT DACL ACE.
1324 */
1325
1326 if ((current_ace = (canon_ace *)malloc(sizeof(canon_ace))) == NULL) {
1327 free_canon_ace_list(file_ace);
1328 free_canon_ace_list(dir_ace);
1329 DEBUG(0,("create_canon_ace_lists: malloc fail.\n"));
1330 return False;
1331 }
1332
1333 ZERO_STRUCTP(current_ace);
1334
1335 sid_copy(&current_ace->trustee, &psa->trustee);
1336
1337 /*
1338 * Try and work out if the SID is a user or group
1339 * as we need to flag these differently for POSIX.
1340 * Note what kind of a POSIX ACL this should map to.
1341 */
1342
1343 if( sid_equal(&current_ace->trustee, &global_sid_World)) {
1344 current_ace->owner_type = WORLD_ACE;
1345 current_ace->unix_ug.world = -1;
1346 current_ace->type = SMB_ACL_OTHER;
1347 } else if (sid_equal(&current_ace->trustee, &global_sid_Creator_Owner)) {
1348 current_ace->owner_type = UID_ACE;
1349 current_ace->unix_ug.uid = pst->st_uid;
1350 current_ace->type = SMB_ACL_USER_OBJ;
1351
1352 /*
1353 * The Creator Owner entry only specifies inheritable permissions,
1354 * never access permissions. WinNT doesn't always set the ACE to
1355 *INHERIT_ONLY, though.
1356 */
1357
1358 if (nt4_compatible_acls())
1359 psa->flags |= SEC_ACE_FLAG_INHERIT_ONLY;
1360 } else if (sid_equal(&current_ace->trustee, &global_sid_Creator_Group)) {
1361 current_ace->owner_type = GID_ACE;
1362 current_ace->unix_ug.gid = pst->st_gid;
1363 current_ace->type = SMB_ACL_GROUP_OBJ;
1364
1365 /*
1366 * The Creator Group entry only specifies inheritable permissions,
1367 * never access permissions. WinNT doesn't always set the ACE to
1368 *INHERIT_ONLY, though.
1369 */
1370 if (nt4_compatible_acls())
1371 psa->flags |= SEC_ACE_FLAG_INHERIT_ONLY;
1372
1373 } else if (NT_STATUS_IS_OK(sid_to_uid( &current_ace->trustee, &current_ace->unix_ug.uid))) {
1374 current_ace->owner_type = UID_ACE;
1375 current_ace->type = SMB_ACL_USER;
1376 } else if (NT_STATUS_IS_OK(sid_to_gid( &current_ace->trustee, &current_ace->unix_ug.gid))) {
1377 current_ace->owner_type = GID_ACE;
1378 current_ace->type = SMB_ACL_GROUP;
1379 } else {
1380 fstring str;
1381
1382 free_canon_ace_list(file_ace);
1383 free_canon_ace_list(dir_ace);
1384 DEBUG(0,("create_canon_ace_lists: unable to map SID %s to uid or gid.\n",
1385 sid_to_string(str, &current_ace->trustee) ));
1386 SAFE_FREE(current_ace);
1387 return False;
1388 }
1389
1390 /*
1391 * Map the given NT permissions into a UNIX mode_t containing only
1392 * S_I(R|W|X)USR bits.
1393 */
1394
1395 current_ace->perms |= map_nt_perms( psa->info, S_IRUSR);
1396 current_ace->attr = (psa->type == SEC_ACE_TYPE_ACCESS_ALLOWED) ? ALLOW_ACE : DENY_ACE;
1397 current_ace->inherited = ((psa->flags & SEC_ACE_FLAG_INHERITED_ACE) ? True : False);
1398
1399 /*
1400 * Now add the created ace to either the file list, the directory
1401 * list, or both. We *MUST* preserve the order here (hence we use
1402 * DLIST_ADD_END) as NT ACLs are order dependent.
1403 */
1404
1405 if (fsp->is_directory) {
1406
1407 /*
1408 * We can only add to the default POSIX ACE list if the ACE is
1409 * designed to be inherited by both files and directories.
1410 */
1411
1412 if ((psa->flags & (SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT)) ==
1413 (SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT)) {
1414
1415 DLIST_ADD_END(dir_ace, current_ace, tmp_ace);
1416
1417 /*
1418 * Note if this was an allow ace. We can't process
1419 * any further deny ace's after this.
1420 */
1421
1422 if (current_ace->attr == ALLOW_ACE)
1423 got_dir_allow = True;
1424
1425 if ((current_ace->attr == DENY_ACE) && got_dir_allow) {
1426 DEBUG(0,("create_canon_ace_lists: malformed ACL in inheritable ACL ! \
1427 Deny entry after Allow entry. Failing to set on file %s.\n", fsp->fsp_name ));
1428 free_canon_ace_list(file_ace);
1429 free_canon_ace_list(dir_ace);
1430 SAFE_FREE(current_ace);
1431 return False;
1432 }
1433
1434 if( DEBUGLVL( 10 )) {
1435 dbgtext("create_canon_ace_lists: adding dir ACL:\n");
1436 print_canon_ace( current_ace, 0);
1437 }
1438
1439 /*
1440 * If this is not an inherit only ACE we need to add a duplicate
1441 * to the file acl.
1442 */
1443
1444 if (!(psa->flags & SEC_ACE_FLAG_INHERIT_ONLY)) {
1445 canon_ace *dup_ace = dup_canon_ace(current_ace);
1446
1447 if (!dup_ace) {
1448 DEBUG(0,("create_canon_ace_lists: malloc fail !\n"));
1449 free_canon_ace_list(file_ace);
1450 free_canon_ace_list(dir_ace);
1451 return False;
1452 }
1453
1454 /*
1455 * We must not free current_ace here as its
1456 * pointer is now owned by the dir_ace list.
1457 */
1458 current_ace = dup_ace;
1459 } else {
1460 /*
1461 * We must not free current_ace here as its
1462 * pointer is now owned by the dir_ace list.
1463 */
1464 current_ace = NULL;
1465 }
1466 }
1467 }
1468
1469 /*
1470 * Only add to the file ACL if not inherit only.
1471 */
1472
1473 if (!(psa->flags & SEC_ACE_FLAG_INHERIT_ONLY)) {
1474 DLIST_ADD_END(file_ace, current_ace, tmp_ace);
1475
1476 /*
1477 * Note if this was an allow ace. We can't process
1478 * any further deny ace's after this.
1479 */
1480
1481 if (current_ace->attr == ALLOW_ACE)
1482 got_file_allow = True;
1483
1484 if ((current_ace->attr == DENY_ACE) && got_file_allow) {
1485 DEBUG(0,("create_canon_ace_lists: malformed ACL in file ACL ! \
1486 Deny entry after Allow entry. Failing to set on file %s.\n", fsp->fsp_name ));
1487 free_canon_ace_list(file_ace);
1488 free_canon_ace_list(dir_ace);
1489 SAFE_FREE(current_ace);
1490 return False;
1491 }
1492
1493 if( DEBUGLVL( 10 )) {
1494 dbgtext("create_canon_ace_lists: adding file ACL:\n");
1495 print_canon_ace( current_ace, 0);
1496 }
1497 all_aces_are_inherit_only = False;
1498 /*
1499 * We must not free current_ace here as its
1500 * pointer is now owned by the file_ace list.
1501 */
1502 current_ace = NULL;
1503 }
1504
1505 /*
1506 * Free if ACE was not added.
1507 */
1508
1509 SAFE_FREE(current_ace);
1510 }
1511
1512 if (fsp->is_directory && all_aces_are_inherit_only) {
1513 /*
1514 * Windows 2000 is doing one of these weird 'inherit acl'
1515 * traverses to conserve NTFS ACL resources. Just pretend
1516 * there was no DACL sent. JRA.
1517 */
1518
1519 DEBUG(10,("create_canon_ace_lists: Win2k inherit acl traverse. Ignoring DACL.\n"));
1520 free_canon_ace_list(file_ace);
1521 free_canon_ace_list(dir_ace);
1522 file_ace = NULL;
1523 dir_ace = NULL;
1524 } else {
1525 /*
1526 * Check if we have SMB_ACL_USER_OBJ and SMB_ACL_GROUP_OBJ entries in each
1527 * ACL. If we don't have them, check if any SMB_ACL_USER/SMB_ACL_GROUP
1528 * entries can be converted to *_OBJ. Usually we will already have these
1529 * entries in the Default ACL, and the Access ACL will not have them.
1530 */
1531 check_owning_objs(file_ace, pfile_owner_sid, pfile_grp_sid);
1532 check_owning_objs(dir_ace, pfile_owner_sid, pfile_grp_sid);
1533 }
1534
1535 *ppfile_ace = file_ace;
1536 *ppdir_ace = dir_ace;
1537
1538 return True;
1539 }
1540
1541 /****************************************************************************
1542 ASCII art time again... JRA :-).
1543
1544 We have 4 cases to process when moving from an NT ACL to a POSIX ACL. Firstly,
1545 we insist the ACL is in canonical form (ie. all DENY entries preceede ALLOW
1546 entries). Secondly, the merge code has ensured that all duplicate SID entries for
1547 allow or deny have been merged, so the same SID can only appear once in the deny
1548 list or once in the allow list.
1549
1550 We then process as follows :
1551
1552 ---------------------------------------------------------------------------
1553 First pass - look for a Everyone DENY entry.
1554
1555 If it is deny all (rwx) trunate the list at this point.
1556 Else, walk the list from this point and use the deny permissions of this
1557 entry as a mask on all following allow entries. Finally, delete
1558 the Everyone DENY entry (we have applied it to everything possible).
1559
1560 In addition, in this pass we remove any DENY entries that have
1561 no permissions (ie. they are a DENY nothing).
1562 ---------------------------------------------------------------------------
1563 Second pass - only deal with deny user entries.
1564
1565 DENY user1 (perms XXX)
1566
1567 new_perms = 0
1568 for all following allow group entries where user1 is in group
1569 new_perms |= group_perms;
1570
1571 user1 entry perms = new_perms & ~ XXX;
1572
1573 Convert the deny entry to an allow entry with the new perms and
1574 push to the end of the list. Note if the user was in no groups
1575 this maps to a specific allow nothing entry for this user.
1576
1577 The common case from the NT ACL choser (userX deny all) is
1578 optimised so we don't do the group lookup - we just map to
1579 an allow nothing entry.
1580
1581 What we're doing here is inferring the allow permissions the
1582 person setting the ACE on user1 wanted by looking at the allow
1583 permissions on the groups the user is currently in. This will
1584 be a snapshot, depending on group membership but is the best
1585 we can do and has the advantage of failing closed rather than
1586 open.
1587 ---------------------------------------------------------------------------
1588 Third pass - only deal with deny group entries.
1589
1590 DENY group1 (perms XXX)
1591
1592 for all following allow user entries where user is in group1
1593 user entry perms = user entry perms & ~ XXX;
1594
1595 If there is a group Everyone allow entry with permissions YYY,
1596 convert the group1 entry to an allow entry and modify its
1597 permissions to be :
1598
1599 new_perms = YYY & ~ XXX
1600
1601 and push to the end of the list.
1602
1603 If there is no group Everyone allow entry then convert the
1604 group1 entry to a allow nothing entry and push to the end of the list.
1605
1606 Note that the common case from the NT ACL choser (groupX deny all)
1607 cannot be optimised here as we need to modify user entries who are
1608 in the group to change them to a deny all also.
1609
1610 What we're doing here is modifying the allow permissions of
1611 user entries (which are more specific in POSIX ACLs) to mask
1612 out the explicit deny set on the group they are in. This will
1613 be a snapshot depending on current group membership but is the
1614 best we can do and has the advantage of failing closed rather
1615 than open.
1616 ---------------------------------------------------------------------------
1617 Fourth pass - cope with cumulative permissions.
1618
1619 for all allow user entries, if there exists an allow group entry with
1620 more permissive permissions, and the user is in that group, rewrite the
1621 allow user permissions to contain both sets of permissions.
1622
1623 Currently the code for this is #ifdef'ed out as these semantics make
1624 no sense to me. JRA.
1625 ---------------------------------------------------------------------------
1626
1627 Note we *MUST* do the deny user pass first as this will convert deny user
1628 entries into allow user entries which can then be processed by the deny
1629 group pass.
1630
1631 The above algorithm took a *lot* of thinking about - hence this
1632 explaination :-). JRA.
1633 ****************************************************************************/
1634
1635 /****************************************************************************
1636 Process a canon_ace list entries. This is very complex code. We need
1637 to go through and remove the "deny" permissions from any allow entry that matches
1638 the id of this entry. We have already refused any NT ACL that wasn't in correct
1639 order (DENY followed by ALLOW). If any allow entry ends up with zero permissions,
1640 we just remove it (to fail safe). We have already removed any duplicate ace
1641 entries. Treat an "Everyone" DENY_ACE as a special case - use it to mask all
1642 allow entries.
1643 ****************************************************************************/
1644
1645 static void process_deny_list( canon_ace **pp_ace_list )
1646 {
1647 extern DOM_SID global_sid_World;
1648 canon_ace *ace_list = *pp_ace_list;
1649 canon_ace *curr_ace = NULL;
1650 canon_ace *curr_ace_next = NULL;
1651
1652 /* Pass 1 above - look for an Everyone, deny entry. */
1653
1654 for (curr_ace = ace_list; curr_ace; curr_ace = curr_ace_next) {
1655 canon_ace *allow_ace_p;
1656
1657 curr_ace_next = curr_ace->next; /* So we can't lose the link. */
1658
1659 if (curr_ace->attr != DENY_ACE)
1660 continue;
1661
1662 if (curr_ace->perms == (mode_t)0) {
1663
1664 /* Deny nothing entry - delete. */
1665
1666 DLIST_REMOVE(ace_list, curr_ace);
1667 continue;
1668 }
1669
1670 if (!sid_equal(&curr_ace->trustee, &global_sid_World))
1671 continue;
1672
1673 /* JRATEST - assert. */
1674 SMB_ASSERT(curr_ace->owner_type == WORLD_ACE);
1675
1676 if (curr_ace->perms == ALL_ACE_PERMS) {
1677
1678 /*
1679 * Optimisation. This is a DENY_ALL to Everyone. Truncate the
1680 * list at this point including this entry.
1681 */
1682
1683 canon_ace *prev_entry = curr_ace->prev;
1684
1685 free_canon_ace_list( curr_ace );
1686 if (prev_entry)
1687 prev_entry->next = NULL;
1688 else {
1689 /* We deleted the entire list. */
1690 ace_list = NULL;
1691 }
1692 break;
1693 }
1694
1695 for (allow_ace_p = curr_ace->next; allow_ace_p; allow_ace_p = allow_ace_p->next) {
1696
1697 /*
1698 * Only mask off allow entries.
1699 */
1700
1701 if (allow_ace_p->attr != ALLOW_ACE)
1702 continue;
1703
1704 allow_ace_p->perms &= ~curr_ace->perms;
1705 }
1706
1707 /*
1708 * Now it's been applied, remove it.
1709 */
1710
1711 DLIST_REMOVE(ace_list, curr_ace);
1712 }
1713
1714 /* Pass 2 above - deal with deny user entries. */
1715
1716 for (curr_ace = ace_list; curr_ace; curr_ace = curr_ace_next) {
1717 mode_t new_perms = (mode_t)0;
1718 canon_ace *allow_ace_p;
1719 canon_ace *tmp_ace;
1720
1721 curr_ace_next = curr_ace->next; /* So we can't lose the link. */
1722
1723 if (curr_ace->attr != DENY_ACE)
1724 continue;
1725
1726 if (curr_ace->owner_type != UID_ACE)
1727 continue;
1728
1729 if (curr_ace->perms == ALL_ACE_PERMS) {
1730
1731 /*
1732 * Optimisation - this is a deny everything to this user.
1733 * Convert to an allow nothing and push to the end of the list.
1734 */
1735
1736 curr_ace->attr = ALLOW_ACE;
1737 curr_ace->perms = (mode_t)0;
1738 DLIST_DEMOTE(ace_list, curr_ace, tmp_ace);
1739 continue;
1740 }
1741
1742 for (allow_ace_p = curr_ace->next; allow_ace_p; allow_ace_p = allow_ace_p->next) {
1743
1744 if (allow_ace_p->attr != ALLOW_ACE)
1745 continue;
1746
1747 /* We process GID_ACE and WORLD_ACE entries only. */
1748
1749 if (allow_ace_p->owner_type == UID_ACE)
1750 continue;
1751
1752 if (uid_entry_in_group( curr_ace, allow_ace_p))
1753 new_perms |= allow_ace_p->perms;
1754 }
1755
1756 /*
1757 * Convert to a allow entry, modify the perms and push to the end
1758 * of the list.
1759 */
1760
1761 curr_ace->attr = ALLOW_ACE;
1762 curr_ace->perms = (new_perms & ~curr_ace->perms);
1763 DLIST_DEMOTE(ace_list, curr_ace, tmp_ace);
1764 }
1765
1766 /* Pass 3 above - deal with deny group entries. */
1767
1768 for (curr_ace = ace_list; curr_ace; curr_ace = curr_ace_next) {
1769 canon_ace *tmp_ace;
1770 canon_ace *allow_ace_p;
1771 canon_ace *allow_everyone_p = NULL;
1772
1773 curr_ace_next = curr_ace->next; /* So we can't lose the link. */
1774
1775 if (curr_ace->attr != DENY_ACE)
1776 continue;
1777
1778 if (curr_ace->owner_type != GID_ACE)
1779 continue;
1780
1781 for (allow_ace_p = curr_ace->next; allow_ace_p; allow_ace_p = allow_ace_p->next) {
1782
1783 if (allow_ace_p->attr != ALLOW_ACE)
1784 continue;
1785
1786 /* Store a pointer to the Everyone allow, if it exists. */
1787 if (allow_ace_p->owner_type == WORLD_ACE)
1788 allow_everyone_p = allow_ace_p;
1789
1790 /* We process UID_ACE entries only. */
1791
1792 if (allow_ace_p->owner_type != UID_ACE)
1793 continue;
1794
1795 /* Mask off the deny group perms. */
1796
1797 if (uid_entry_in_group( allow_ace_p, curr_ace))
1798 allow_ace_p->perms &= ~curr_ace->perms;
1799 }
1800
1801 /*
1802 * Convert the deny to an allow with the correct perms and
1803 * push to the end of the list.
1804 */
1805
1806 curr_ace->attr = ALLOW_ACE;
1807 if (allow_everyone_p)
1808 curr_ace->perms = allow_everyone_p->perms & ~curr_ace->perms;
1809 else
1810 curr_ace->perms = (mode_t)0;
1811 DLIST_DEMOTE(ace_list, curr_ace, tmp_ace);
1812
1813 }
1814
1815 /* Doing this fourth pass allows Windows semantics to be layered
1816 * on top of POSIX semantics. I'm not sure if this is desirable.
1817 * For example, in W2K ACLs there is no way to say, "Group X no
1818 * access, user Y full access" if user Y is a member of group X.
1819 * This seems completely broken semantics to me.... JRA.
1820 */
1821
1822 #if 0
1823 /* Pass 4 above - deal with allow entries. */
1824
1825 for (curr_ace = ace_list; curr_ace; curr_ace = curr_ace_next) {
1826 canon_ace *allow_ace_p;
1827
1828 curr_ace_next = curr_ace->next; /* So we can't lose the link. */
1829
1830 if (curr_ace->attr != ALLOW_ACE)
1831 continue;
1832
1833 if (curr_ace->owner_type != UID_ACE)
1834 continue;
1835
1836 for (allow_ace_p = ace_list; allow_ace_p; allow_ace_p = allow_ace_p->next) {
1837
1838 if (allow_ace_p->attr != ALLOW_ACE)
1839 continue;
1840
1841 /* We process GID_ACE entries only. */
1842
1843 if (allow_ace_p->owner_type != GID_ACE)
1844 continue;
1845
1846 /* OR in the group perms. */
1847
1848 if (uid_entry_in_group( curr_ace, allow_ace_p))
1849 curr_ace->perms |= allow_ace_p->perms;
1850 }
1851 }
1852 #endif
1853
1854 *pp_ace_list = ace_list;
1855 }
1856
1857 /****************************************************************************
1858 Create a default mode that will be used if a security descriptor entry has
1859 no user/group/world entries.
1860 ****************************************************************************/
1861
1862 static mode_t create_default_mode(files_struct *fsp, BOOL interitable_mode)
1863 {
1864 int snum = SNUM(fsp->conn);
1865 mode_t and_bits = (mode_t)0;
1866 mode_t or_bits = (mode_t)0;
1867 mode_t mode = interitable_mode ? unix_mode( fsp->conn, FILE_ATTRIBUTE_ARCHIVE, fsp->fsp_name) : S_IRUSR;
1868
1869 if (fsp->is_directory)
1870 mode |= (S_IWUSR|S_IXUSR);
1871
1872 /*
1873 * Now AND with the create mode/directory mode bits then OR with the
1874 * force create mode/force directory mode bits.
1875 */
1876
1877 if (fsp->is_directory) {
1878 and_bits = lp_dir_security_mask(snum);
1879 or_bits = lp_force_dir_security_mode(snum);
1880 } else {
1881 and_bits = lp_security_mask(snum);
1882 or_bits = lp_force_security_mode(snum);
1883 }
1884
1885 return ((mode & and_bits)|or_bits);
1886 }
1887
1888 /****************************************************************************
1889 Unpack a SEC_DESC into two canonical ace lists. We don't depend on this
1890 succeeding.
1891 ****************************************************************************/
1892
1893 static BOOL unpack_canon_ace(files_struct *fsp,
1894 SMB_STRUCT_STAT *pst,
1895 DOM_SID *pfile_owner_sid,
1896 DOM_SID *pfile_grp_sid,
1897 canon_ace **ppfile_ace, canon_ace **ppdir_ace,
1898 uint32 security_info_sent, SEC_DESC *psd)
1899 {
1900 canon_ace *file_ace = NULL;
1901 canon_ace *dir_ace = NULL;
1902
1903 *ppfile_ace = NULL;
1904 *ppdir_ace = NULL;
1905
1906 if(security_info_sent == 0) {
1907 DEBUG(0,("unpack_canon_ace: no security info sent !\n"));
1908 return False;
1909 }
1910
1911 /*
1912 * If no DACL then this is a chown only security descriptor.
1913 */
1914
1915 if(!(security_info_sent & DACL_SECURITY_INFORMATION) || !psd->dacl)
1916 return True;
1917
1918 /*
1919 * Now go through the DACL and create the canon_ace lists.
1920 */
1921
1922 if (!create_canon_ace_lists( fsp, pst, pfile_owner_sid, pfile_grp_sid,
1923 &file_ace, &dir_ace, psd->dacl))
1924 return False;
1925
1926 if ((file_ace == NULL) && (dir_ace == NULL)) {
1927 /* W2K traverse DACL set - ignore. */
1928 return True;
1929 }
1930
1931 /*
1932 * Go through the canon_ace list and merge entries
1933 * belonging to identical users of identical allow or deny type.
1934 * We can do this as all deny entries come first, followed by
1935 * all allow entries (we have mandated this before accepting this acl).
1936 */
1937
1938 print_canon_ace_list( "file ace - before merge", file_ace);
1939 merge_aces( &file_ace );
1940
1941 print_canon_ace_list( "dir ace - before merge", dir_ace);
1942 merge_aces( &dir_ace );
1943
1944 /*
1945 * NT ACLs are order dependent. Go through the acl lists and
1946 * process DENY entries by masking the allow entries.
1947 */
1948
1949 print_canon_ace_list( "file ace - before deny", file_ace);
1950 process_deny_list( &file_ace);
1951
1952 print_canon_ace_list( "dir ace - before deny", dir_ace);
1953 process_deny_list( &dir_ace);
1954
1955 /*
1956 * A well formed POSIX file or default ACL has at least 3 entries, a
1957 * SMB_ACL_USER_OBJ, SMB_ACL_GROUP_OBJ, SMB_ACL_OTHER_OBJ
1958 * and optionally a mask entry. Ensure this is the case.
1959 */
1960
1961 print_canon_ace_list( "file ace - before valid", file_ace);
1962
1963 /*
1964 * A default 3 element mode entry for a file should be r-- --- ---.
1965 * A default 3 element mode entry for a directory should be rwx --- ---.
1966 */
1967
1968 pst->st_mode = create_default_mode(fsp, False);
1969
1970 if (!ensure_canon_entry_valid(&file_ace, fsp, pfile_owner_sid, pfile_grp_sid, pst, True)) {
1971 free_canon_ace_list(file_ace);
1972 free_canon_ace_list(dir_ace);
1973 return False;
1974 }
1975
1976 print_canon_ace_list( "dir ace - before valid", dir_ace);
1977
1978 /*
1979 * A default inheritable 3 element mode entry for a directory should be the
1980 * mode Samba will use to create a file within. Ensure user rwx bits are set if
1981 * it's a directory.
1982 */
1983
1984 pst->st_mode = create_default_mode(fsp, True);
1985
1986 if (dir_ace && !ensure_canon_entry_valid(&dir_ace, fsp, pfile_owner_sid, pfile_grp_sid, pst, True)) {
1987 free_canon_ace_list(file_ace);
1988 free_canon_ace_list(dir_ace);
1989 return False;
1990 }
1991
1992 print_canon_ace_list( "file ace - return", file_ace);
1993 print_canon_ace_list( "dir ace - return", dir_ace);
1994
1995 *ppfile_ace = file_ace;
1996 *ppdir_ace = dir_ace;
1997 return True;
1998
1999 }
2000
2001 /******************************************************************************
2002 When returning permissions, try and fit NT display
2003 semantics if possible. Note the the canon_entries here must have been malloced.
2004 The list format should be - first entry = owner, followed by group and other user
2005 entries, last entry = other.
2006
2007 Note that this doesn't exactly match the NT semantics for an ACL. As POSIX entries
2008 are not ordered, and match on the most specific entry rather than walking a list,
2009 then a simple POSIX permission of rw-r--r-- should really map to 5 entries,
2010
2011 Entry 0: owner : deny all except read and write.
2012 Entry 1: group : deny all except read.
2013 Entry 2: owner : allow read and write.
2014 Entry 3: group : allow read.
2015 Entry 4: Everyone : allow read.
2016
2017 But NT cannot display this in their ACL editor !
2018 ********************************************************************************/
2019
2020 static void arrange_posix_perms( char *filename, canon_ace **pp_list_head)
2021 {
2022 canon_ace *list_head = *pp_list_head;
2023 canon_ace *owner_ace = NULL;
2024 canon_ace *other_ace = NULL;
2025 canon_ace *ace = NULL;
2026
2027 for (ace = list_head; ace; ace = ace->next) {
2028 if (ace->type == SMB_ACL_USER_OBJ)
2029 owner_ace = ace;
2030 else if (ace->type == SMB_ACL_OTHER) {
2031 /* Last ace - this is "other" */
2032 other_ace = ace;
2033 }
2034 }
2035
2036 if (!owner_ace || !other_ace) {
2037 DEBUG(0,("arrange_posix_perms: Invalid POSIX permissions for file %s, missing owner or other.\n",
2038 filename ));
2039 return;
2040 }
2041
2042 /*
2043 * The POSIX algorithm applies to owner first, and other last,
2044 * so ensure they are arranged in this order.
2045 */
2046
2047 if (owner_ace) {
2048 DLIST_PROMOTE(list_head, owner_ace);
2049 }
2050
2051 if (other_ace) {
2052 DLIST_DEMOTE(list_head, other_ace, ace);
2053 }
2054
2055 /* We have probably changed the head of the list. */
2056
2057 *pp_list_head = list_head;
2058 }
2059
2060 /****************************************************************************
2061 Create a linked list of canonical ACE entries.
2062 ****************************************************************************/
2063
2064 static canon_ace *canonicalise_acl( files_struct *fsp, SMB_ACL_T posix_acl, SMB_STRUCT_STAT *psbuf,
2065 DOM_SID *powner, DOM_SID *pgroup, struct pai_val *pal, SMB_ACL_TYPE_T the_acl_type)
2066 {
2067 extern DOM_SID global_sid_World;
2068 connection_struct *conn = fsp->conn;
2069 mode_t acl_mask = (S_IRUSR|S_IWUSR|S_IXUSR);
2070 canon_ace *list_head = NULL;
2071 canon_ace *ace = NULL;
2072 canon_ace *next_ace = NULL;
2073 int entry_id = SMB_ACL_FIRST_ENTRY;
2074 SMB_ACL_ENTRY_T entry;
2075 size_t ace_count;
2076
2077 while ( posix_acl && (SMB_VFS_SYS_ACL_GET_ENTRY(conn, posix_acl, entry_id, &entry) == 1)) {
2078 SMB_ACL_TAG_T tagtype;
2079 SMB_ACL_PERMSET_T permset;
2080 DOM_SID sid;
2081 posix_id unix_ug;
2082 enum ace_owner owner_type;
2083
2084 /* get_next... */
2085 if (entry_id == SMB_ACL_FIRST_ENTRY)
2086 entry_id = SMB_ACL_NEXT_ENTRY;
2087
2088 /* Is this a MASK entry ? */
2089 if (SMB_VFS_SYS_ACL_GET_TAG_TYPE(conn, entry, &tagtype) == -1)
2090 continue;
2091
2092 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, entry, &permset) == -1)
2093 continue;
2094
2095 /* Decide which SID to use based on the ACL type. */
2096 switch(tagtype) {
2097 case SMB_ACL_USER_OBJ:
2098 /* Get the SID from the owner. */
2099 sid_copy(&sid, powner);
2100 unix_ug.uid = psbuf->st_uid;
2101 owner_type = UID_ACE;
2102 break;
2103 case SMB_ACL_USER:
2104 {
2105 uid_t *puid = (uid_t *)SMB_VFS_SYS_ACL_GET_QUALIFIER(conn, entry);
2106 if (puid == NULL) {
2107 DEBUG(0,("canonicalise_acl: Failed to get uid.\n"));
2108 continue;
2109 }
2110 /*
2111 * A SMB_ACL_USER entry for the owner is shadowed by the
2112 * SMB_ACL_USER_OBJ entry and Windows also cannot represent
2113 * that entry, so we ignore it. We also don't create such
2114 * entries out of the blue when setting ACLs, so a get/set
2115 * cycle will drop them.
2116 */
2117 if (the_acl_type == SMB_ACL_TYPE_ACCESS && *puid == psbuf->st_uid) {
2118 SMB_VFS_SYS_ACL_FREE_QUALIFIER(conn, (void *)puid,tagtype);
2119 continue;
2120 }
2121 uid_to_sid( &sid, *puid);
2122 unix_ug.uid = *puid;
2123 owner_type = UID_ACE;
2124 SMB_VFS_SYS_ACL_FREE_QUALIFIER(conn, (void *)puid,tagtype);
2125 break;
2126 }
2127 case SMB_ACL_GROUP_OBJ:
2128 /* Get the SID from the owning group. */
2129 sid_copy(&sid, pgroup);
2130 unix_ug.gid = psbuf->st_gid;
2131 owner_type = GID_ACE;
2132 break;
2133 case SMB_ACL_GROUP:
2134 {
2135 gid_t *pgid = (gid_t *)SMB_VFS_SYS_ACL_GET_QUALIFIER(conn, entry);
2136 if (pgid == NULL) {
2137 DEBUG(0,("canonicalise_acl: Failed to get gid.\n"));
2138 continue;
2139 }
2140 gid_to_sid( &sid, *pgid);
2141 unix_ug.gid = *pgid;
2142 owner_type = GID_ACE;
2143 SMB_VFS_SYS_ACL_FREE_QUALIFIER(conn, (void *)pgid,tagtype);
2144 break;
2145 }
2146 case SMB_ACL_MASK:
2147 acl_mask = convert_permset_to_mode_t(conn, permset);
2148 continue; /* Don't count the mask as an entry. */
2149 case SMB_ACL_OTHER:
2150 /* Use the Everyone SID */
2151 sid = global_sid_World;
2152 unix_ug.world = -1;
2153 owner_type = WORLD_ACE;
2154 break;
2155 default:
2156 DEBUG(0,("canonicalise_acl: Unknown tagtype %u\n", (unsigned int)tagtype));
2157 continue;
2158 }
2159
2160 /*
2161 * Add this entry to the list.
2162 */
2163
2164 if ((ace = (canon_ace *)malloc(sizeof(canon_ace))) == NULL)
2165 goto fail;
2166
2167 ZERO_STRUCTP(ace);
2168 ace->type = tagtype;
2169 ace->perms = convert_permset_to_mode_t(conn, permset);
2170 ace->attr = ALLOW_ACE;
2171 ace->trustee = sid;
2172 ace->unix_ug = unix_ug;
2173 ace->owner_type = owner_type;
2174 ace->inherited = get_inherited_flag(pal, ace, (the_acl_type == SMB_ACL_TYPE_DEFAULT));
2175
2176 DLIST_ADD(list_head, ace);
2177 }
2178
2179 /*
2180 * This next call will ensure we have at least a user/group/world set.
2181 */
2182
2183 if (!ensure_canon_entry_valid(&list_head, fsp, powner, pgroup, psbuf, False))
2184 goto fail;
2185
2186 /*
2187 * Now go through the list, masking the permissions with the
2188 * acl_mask. Ensure all DENY Entries are at the start of the list.
2189 */
2190
2191 DEBUG(10,("canonicalise_acl: %s ace entries before arrange :\n", the_acl_type == SMB_ACL_TYPE_ACCESS ? "Access" : "Default" ));
2192
2193 for ( ace_count = 0, ace = list_head; ace; ace = next_ace, ace_count++) {
2194 next_ace = ace->next;
2195
2196 /* Masks are only applied to entries other than USER_OBJ and OTHER. */
2197 if (ace->type != SMB_ACL_OTHER && ace->type != SMB_ACL_USER_OBJ)
2198 ace->perms &= acl_mask;
2199
2200 if (ace->perms == 0) {
2201 DLIST_PROMOTE(list_head, ace);
2202 }
2203
2204 if( DEBUGLVL( 10 ) ) {
2205 print_canon_ace(ace, ace_count);
2206 }
2207 }
2208
2209 arrange_posix_perms(fsp->fsp_name,&list_head );
2210
2211 print_canon_ace_list( "canonicalise_acl: ace entries after arrange", list_head );
2212
2213 return list_head;
2214
2215 fail:
2216
2217 free_canon_ace_list(list_head);
2218 return NULL;
2219 }
2220
2221 /****************************************************************************
2222 Attempt to apply an ACL to a file or directory.
2223 ****************************************************************************/
2224
2225 static BOOL set_canon_ace_list(files_struct *fsp, canon_ace *the_ace, BOOL default_ace, BOOL *pacl_set_support)
2226 {
2227 connection_struct *conn = fsp->conn;
2228 BOOL ret = False;
2229 SMB_ACL_T the_acl = SMB_VFS_SYS_ACL_INIT(conn, (int)count_canon_ace_list(the_ace) + 1);
2230 canon_ace *p_ace;
2231 int i;
2232 SMB_ACL_ENTRY_T mask_entry;
2233 BOOL got_mask_entry = False;
2234 SMB_ACL_PERMSET_T mask_permset;
2235 SMB_ACL_TYPE_T the_acl_type = (default_ace ? SMB_ACL_TYPE_DEFAULT : SMB_ACL_TYPE_ACCESS);
2236 BOOL needs_mask = False;
2237 mode_t mask_perms = 0;
2238
2239 #if defined(POSIX_ACL_NEEDS_MASK)
2240 /* HP-UX always wants to have a mask (called "class" there). */
2241 needs_mask = True;
2242 #endif
2243
2244 if (the_acl == NULL) {
2245
2246 if (!no_acl_syscall_error(errno)) {
2247 /*
2248 * Only print this error message if we have some kind of ACL
2249 * support that's not working. Otherwise we would always get this.
2250 */
2251 DEBUG(0,("set_canon_ace_list: Unable to init %s ACL. (%s)\n",
2252 default_ace ? "default" : "file", strerror(errno) ));
2253 }
2254 *pacl_set_support = False;
2255 return False;
2256 }
2257
2258 if( DEBUGLVL( 10 )) {
2259 dbgtext("set_canon_ace_list: setting ACL:\n");
2260 for (i = 0, p_ace = the_ace; p_ace; p_ace = p_ace->next, i++ ) {
2261 print_canon_ace( p_ace, i);
2262 }
2263 }
2264
2265 for (i = 0, p_ace = the_ace; p_ace; p_ace = p_ace->next, i++ ) {
2266 SMB_ACL_ENTRY_T the_entry;
2267 SMB_ACL_PERMSET_T the_permset;
2268
2269 /*
2270 * ACLs only "need" an ACL_MASK entry if there are any named user or
2271 * named group entries. But if there is an ACL_MASK entry, it applies
2272 * to ACL_USER, ACL_GROUP, and ACL_GROUP_OBJ entries. Set the mask
2273 * so that it doesn't deny (i.e., mask off) any permissions.
2274 */
2275
2276 if (p_ace->type == SMB_ACL_USER || p_ace->type == SMB_ACL_GROUP) {
2277 needs_mask = True;
2278 mask_perms |= p_ace->perms;
2279 } else if (p_ace->type == SMB_ACL_GROUP_OBJ) {
2280 mask_perms |= p_ace->perms;
2281 }
2282
2283 /*
2284 * Get the entry for this ACE.
2285 */
2286
2287 if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &the_acl, &the_entry) == -1) {
2288 DEBUG(0,("set_canon_ace_list: Failed to create entry %d. (%s)\n",
2289 i, strerror(errno) ));
2290 goto done;
2291 }
2292
2293 if (p_ace->type == SMB_ACL_MASK) {
2294 mask_entry = the_entry;
2295 got_mask_entry = True;
2296 }
2297
2298 /*
2299 * Ok - we now know the ACL calls should be working, don't
2300 * allow fallback to chmod.
2301 */
2302
2303 *pacl_set_support = True;
2304
2305 /*
2306 * Initialise the entry from the canon_ace.
2307 */
2308
2309 /*
2310 * First tell the entry what type of ACE this is.
2311 */
2312
2313 if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, the_entry, p_ace->type) == -1) {
2314 DEBUG(0,("set_canon_ace_list: Failed to set tag type on entry %d. (%s)\n",
2315 i, strerror(errno) ));
2316 goto done;
2317 }
2318
2319 /*
2320 * Only set the qualifier (user or group id) if the entry is a user
2321 * or group id ACE.
2322 */
2323
2324 if ((p_ace->type == SMB_ACL_USER) || (p_ace->type == SMB_ACL_GROUP)) {
2325 if (SMB_VFS_SYS_ACL_SET_QUALIFIER(conn, the_entry,(void *)&p_ace->unix_ug.uid) == -1) {
2326 DEBUG(0,("set_canon_ace_list: Failed to set qualifier on entry %d. (%s)\n",
2327 i, strerror(errno) ));
2328 goto done;
2329 }
2330 }
2331
2332 /*
2333 * Convert the mode_t perms in the canon_ace to a POSIX permset.
2334 */
2335
2336 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, the_entry, &the_permset) == -1) {
2337 DEBUG(0,("set_canon_ace_list: Failed to get permset on entry %d. (%s)\n",
2338 i, strerror(errno) ));
2339 goto done;
2340 }
2341
2342 if (map_acl_perms_to_permset(conn, p_ace->perms, &the_permset) == -1) {
2343 DEBUG(0,("set_canon_ace_list: Failed to create permset for mode (%u) on entry %d. (%s)\n",
2344 (unsigned int)p_ace->perms, i, strerror(errno) ));
2345 goto done;
2346 }
2347
2348 /*
2349 * ..and apply them to the entry.
2350 */
2351
2352 if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, the_entry, the_permset) == -1) {
2353 DEBUG(0,("set_canon_ace_list: Failed to add permset on entry %d. (%s)\n",
2354 i, strerror(errno) ));
2355 goto done;
2356 }
2357
2358 if( DEBUGLVL( 10 ))
2359 print_canon_ace( p_ace, i);
2360
2361 }
2362
2363 if (needs_mask && !got_mask_entry) {
2364 if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &the_acl, &mask_entry) == -1) {
2365 DEBUG(0,("set_canon_ace_list: Failed to create mask entry. (%s)\n", strerror(errno) ));
2366 goto done;
2367 }
2368
2369 if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, mask_entry, SMB_ACL_MASK) == -1) {
2370 DEBUG(0,("set_canon_ace_list: Failed to set tag type on mask entry. (%s)\n",strerror(errno) ));
2371 goto done;
2372 }
2373
2374 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, mask_entry, &mask_permset) == -1) {
2375 DEBUG(0,("set_canon_ace_list: Failed to get mask permset. (%s)\n", strerror(errno) ));
2376 goto done;
2377 }
2378
2379 if (map_acl_perms_to_permset(conn, S_IRUSR|S_IWUSR|S_IXUSR, &mask_permset) == -1) {
2380 DEBUG(0,("set_canon_ace_list: Failed to create mask permset. (%s)\n", strerror(errno) ));
2381 goto done;
2382 }
2383
2384 if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, mask_entry, mask_permset) == -1) {
2385 DEBUG(0,("set_canon_ace_list: Failed to add mask permset. (%s)\n", strerror(errno) ));
2386 goto done;
2387 }
2388 }
2389
2390 /*
2391 * Check if the ACL is valid.
2392 */
2393
2394 if (SMB_VFS_SYS_ACL_VALID(conn, the_acl) == -1) {
2395 DEBUG(0,("set_canon_ace_list: ACL type (%s) is invalid for set (%s).\n",
2396 the_acl_type == SMB_ACL_TYPE_DEFAULT ? "directory default" : "file",
2397 strerror(errno) ));
2398 goto done;
2399 }
2400
2401 /*
2402 * Finally apply it to the file or directory.
2403 */
2404
2405 if(default_ace || fsp->is_directory || fsp->fd == -1) {
2406 if (SMB_VFS_SYS_ACL_SET_FILE(conn, fsp->fsp_name, the_acl_type, the_acl) == -1) {
2407 /*
2408 * Some systems allow all the above calls and only fail with no ACL support
2409 * when attempting to apply the acl. HPUX with HFS is an example of this. JRA.
2410 */
2411 if (no_acl_syscall_error(errno)) {
2412 *pacl_set_support = False;
2413 }
2414
2415 DEBUG(2,("set_canon_ace_list: sys_acl_set_file type %s failed for file %s (%s).\n",
2416 the_acl_type == SMB_ACL_TYPE_DEFAULT ? "directory default" : "file",
2417 fsp->fsp_name, strerror(errno) ));
2418 goto done;
2419 }
2420 } else {
2421 if (SMB_VFS_SYS_ACL_SET_FD(fsp, fsp->fd, the_acl) == -1) {
2422 /*
2423 * Some systems allow all the above calls and only fail with no ACL support
2424 * when attempting to apply the acl. HPUX with HFS is an example of this. JRA.
2425 */
2426 if (no_acl_syscall_error(errno)) {
2427 *pacl_set_support = False;
2428 }
2429
2430 DEBUG(2,("set_canon_ace_list: sys_acl_set_file failed for file %s (%s).\n",
2431 fsp->fsp_name, strerror(errno) ));
2432 goto done;
2433 }
2434 }
2435
2436 ret = True;
2437
2438 done:
2439
2440 if (the_acl != NULL)
2441 SMB_VFS_SYS_ACL_FREE_ACL(conn, the_acl);
2442
2443 return ret;
2444 }
2445
2446 /****************************************************************************
2447 Find a particular canon_ace entry.
2448 ****************************************************************************/
2449
2450 static struct canon_ace *canon_ace_entry_for(struct canon_ace *list, SMB_ACL_TAG_T type, posix_id *id)
2451 {
2452 while (list) {
2453 if (list->type == type && ((type != SMB_ACL_USER && type != SMB_ACL_GROUP) ||
2454 (type == SMB_ACL_USER && id && id->uid == list->unix_ug.uid) ||
2455 (type == SMB_ACL_GROUP && id && id->gid == list->unix_ug.gid)))
2456 break;
2457 list = list->next;
2458 }
2459 return list;
2460 }
2461
2462 /****************************************************************************
2463
2464 ****************************************************************************/
2465
2466 SMB_ACL_T free_empty_sys_acl(connection_struct *conn, SMB_ACL_T the_acl)
2467 {
2468 SMB_ACL_ENTRY_T entry;
2469
2470 if (!the_acl)
2471 return NULL;
2472 if (SMB_VFS_SYS_ACL_GET_ENTRY(conn, the_acl, SMB_ACL_FIRST_ENTRY, &entry) != 1) {
2473 SMB_VFS_SYS_ACL_FREE_ACL(conn, the_acl);
2474 return NULL;
2475 }
2476 return the_acl;
2477 }
2478
2479 /****************************************************************************
2480 Convert a canon_ace to a generic 3 element permission - if possible.
2481 ****************************************************************************/
2482
2483 #define MAP_PERM(p,mask,result) (((p) & (mask)) ? (result) : 0 )
2484
2485 static BOOL convert_canon_ace_to_posix_perms( files_struct *fsp, canon_ace *file_ace_list, mode_t *posix_perms)
2486 {
2487 int snum = SNUM(fsp->conn);
2488 size_t ace_count = count_canon_ace_list(file_ace_list);
2489 canon_ace *ace_p;
2490 canon_ace *owner_ace = NULL;
2491 canon_ace *group_ace = NULL;
2492 canon_ace *other_ace = NULL;
2493 mode_t and_bits;
2494 mode_t or_bits;
2495
2496 if (ace_count != 3) {
2497 DEBUG(3,("convert_canon_ace_to_posix_perms: Too many ACE entries for file %s to convert to \
2498 posix perms.\n", fsp->fsp_name ));
2499 return False;
2500 }
2501
2502 for (ace_p = file_ace_list; ace_p; ace_p = ace_p->next) {
2503 if (ace_p->owner_type == UID_ACE)
2504 owner_ace = ace_p;
2505 else if (ace_p->owner_type == GID_ACE)
2506 group_ace = ace_p;
2507 else if (ace_p->owner_type == WORLD_ACE)
2508 other_ace = ace_p;
2509 }
2510
2511 if (!owner_ace || !group_ace || !other_ace) {
2512 DEBUG(3,("convert_canon_ace_to_posix_perms: Can't get standard entries for file %s.\n",
2513 fsp->fsp_name ));
2514 return False;
2515 }
2516
2517 *posix_perms = (mode_t)0;
2518
2519 *posix_perms |= owner_ace->perms;
2520 *posix_perms |= MAP_PERM(group_ace->perms, S_IRUSR, S_IRGRP);
2521 *posix_perms |= MAP_PERM(group_ace->perms, S_IWUSR, S_IWGRP);
2522 *posix_perms |= MAP_PERM(group_ace->perms, S_IXUSR, S_IXGRP);
2523 *posix_perms |= MAP_PERM(other_ace->perms, S_IRUSR, S_IROTH);
2524 *posix_perms |= MAP_PERM(other_ace->perms, S_IWUSR, S_IWOTH);
2525 *posix_perms |= MAP_PERM(other_ace->perms, S_IXUSR, S_IXOTH);
2526
2527 /* The owner must have at least read access. */
2528
2529 *posix_perms |= S_IRUSR;
2530 if (fsp->is_directory)
2531 *posix_perms |= (S_IWUSR|S_IXUSR);
2532
2533 /* If requested apply the masks. */
2534
2535 /* Get the initial bits to apply. */
2536
2537 if (fsp->is_directory) {
2538 and_bits = lp_dir_security_mask(snum);
2539 or_bits = lp_force_dir_security_mode(snum);
2540 } else {
2541 and_bits = lp_security_mask(snum);
2542 or_bits = lp_force_security_mode(snum);
2543 }
2544
2545 *posix_perms = (((*posix_perms) & and_bits)|or_bits);
2546
2547 DEBUG(10,("convert_canon_ace_to_posix_perms: converted u=%o,g=%o,w=%o to perm=0%o for file %s.\n",
2548 (int)owner_ace->perms, (int)group_ace->perms, (int)other_ace->perms, (int)*posix_perms,
2549 fsp->fsp_name ));
2550
2551 return True;
2552 }
2553
2554 /****************************************************************************
2555 Incoming NT ACLs on a directory can be split into a default POSIX acl (CI|OI|IO) and
2556 a normal POSIX acl. Win2k needs these split acls re-merging into one ACL
2557 with CI|OI set so it is inherited and also applies to the directory.
2558 Based on code from "Jim McDonough" <jmcd@us.ibm.com>.
2559 ****************************************************************************/
2560
2561 static size_t merge_default_aces( SEC_ACE *nt_ace_list, size_t num_aces)
2562 {
2563 size_t i, j;
2564
2565 for (i = 0; i < num_aces; i++) {
2566 for (j = i+1; j < num_aces; j++) {
2567 uint32 i_flags_ni = (nt_ace_list[i].flags & ~SEC_ACE_FLAG_INHERITED_ACE);
2568 uint32 j_flags_ni = (nt_ace_list[j].flags & ~SEC_ACE_FLAG_INHERITED_ACE);
2569 BOOL i_inh = (nt_ace_list[i].flags & SEC_ACE_FLAG_INHERITED_ACE) ? True : False;
2570 BOOL j_inh = (nt_ace_list[j].flags & SEC_ACE_FLAG_INHERITED_ACE) ? True : False;
2571
2572 /* We know the lower number ACE's are file entries. */
2573 if ((nt_ace_list[i].type == nt_ace_list[j].type) &&
2574 (nt_ace_list[i].size == nt_ace_list[j].size) &&
2575 (nt_ace_list[i].info.mask == nt_ace_list[j].info.mask) &&
2576 sid_equal(&nt_ace_list[i].trustee, &nt_ace_list[j].trustee) &&
2577 (i_inh == j_inh) &&
2578 (i_flags_ni == 0) &&
2579 (j_flags_ni == (SEC_ACE_FLAG_OBJECT_INHERIT|
2580 SEC_ACE_FLAG_CONTAINER_INHERIT|
2581 SEC_ACE_FLAG_INHERIT_ONLY))) {
2582 /*
2583 * W2K wants to have access allowed zero access ACE's
2584 * at the end of the list. If the mask is zero, merge
2585 * the non-inherited ACE onto the inherited ACE.
2586 */
2587
2588 if (nt_ace_list[i].info.mask == 0) {
2589 nt_ace_list[j].flags = SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT|
2590 (i_inh ? SEC_ACE_FLAG_INHERITED_ACE : 0);
2591 if (num_aces - i - 1 > 0)
2592 memmove(&nt_ace_list[i], &nt_ace_list[i+1], (num_aces-i-1) *
2593 sizeof(SEC_ACE));
2594
2595 DEBUG(10,("merge_default_aces: Merging zero access ACE %u onto ACE %u.\n",
2596 (unsigned int)i, (unsigned int)j ));
2597 } else {
2598 /*
2599 * These are identical except for the flags.
2600 * Merge the inherited ACE onto the non-inherited ACE.
2601 */
2602
2603 nt_ace_list[i].flags = SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT|
2604 (i_inh ? SEC_ACE_FLAG_INHERITED_ACE : 0);
2605 if (num_aces - j - 1 > 0)
2606 memmove(&nt_ace_list[j], &nt_ace_list[j+1], (num_aces-j-1) *
2607 sizeof(SEC_ACE));
2608
2609 DEBUG(10,("merge_default_aces: Merging ACE %u onto ACE %u.\n",
2610 (unsigned int)j, (unsigned int)i ));
2611 }
2612 num_aces--;
2613 break;
2614 }
2615 }
2616 }
2617
2618 return num_aces;
2619 }
2620 /****************************************************************************
2621 Reply to query a security descriptor from an fsp. If it succeeds it allocates
2622 the space for the return elements and returns the size needed to return the
2623 security descriptor. This should be the only external function needed for
2624 the UNIX style get ACL.
2625 ****************************************************************************/
2626
2627 size_t get_nt_acl(files_struct *fsp, uint32 security_info, SEC_DESC **ppdesc)
2628 {
2629 extern DOM_SID global_sid_Builtin_Administrators;
2630 extern DOM_SID global_sid_Builtin_Users;
2631 extern DOM_SID global_sid_Creator_Owner;
2632 extern DOM_SID global_sid_Creator_Group;
2633 connection_struct *conn = fsp->conn;
2634 SMB_STRUCT_STAT sbuf;
2635 SEC_ACE *nt_ace_list = NULL;
2636 DOM_SID owner_sid;
2637 DOM_SID group_sid;
2638 size_t sd_size = 0;
2639 SEC_ACL *psa = NULL;
2640 size_t num_acls = 0;
2641 size_t num_dir_acls = 0;
2642 size_t num_aces = 0;
2643 SMB_ACL_T posix_acl = NULL;
2644 SMB_ACL_T dir_acl = NULL;
2645 canon_ace *file_ace = NULL;
2646 canon_ace *dir_ace = NULL;
2647 size_t num_profile_acls = 0;
2648 struct pai_val *pal = NULL;
2649 SEC_DESC *psd = NULL;
2650
2651 *ppdesc = NULL;
2652
2653 DEBUG(10,("get_nt_acl: called for file %s\n", fsp->fsp_name ));
2654
2655 if(fsp->is_directory || fsp->fd == -1) {
2656
2657 /* Get the stat struct for the owner info. */
2658 if(SMB_VFS_STAT(fsp->conn,fsp->fsp_name, &sbuf) != 0) {
2659 return 0;
2660 }
2661 /*
2662 * Get the ACL from the path.
2663 */
2664
2665 posix_acl = SMB_VFS_SYS_ACL_GET_FILE(conn, fsp->fsp_name, SMB_ACL_TYPE_ACCESS);
2666
2667 /*
2668 * If it's a directory get the default POSIX ACL.
2669 */
2670
2671 if(fsp->is_directory) {
2672 dir_acl = SMB_VFS_SYS_ACL_GET_FILE(conn, fsp->fsp_name, SMB_ACL_TYPE_DEFAULT);
2673 dir_acl = free_empty_sys_acl(conn, dir_acl);
2674 }
2675
2676 } else {
2677
2678 /* Get the stat struct for the owner info. */
2679 if(SMB_VFS_FSTAT(fsp,fsp->fd,&sbuf) != 0) {
2680 return 0;
2681 }
2682 /*
2683 * Get the ACL from the fd.
2684 */
2685 posix_acl = SMB_VFS_SYS_ACL_GET_FD(fsp, fsp->fd);
2686 }
2687
2688 DEBUG(5,("get_nt_acl : file ACL %s, directory ACL %s\n",
2689 posix_acl ? "present" : "absent",
2690 dir_acl ? "present" : "absent" ));
2691
2692 pal = load_inherited_info(fsp);
2693
2694 /*
2695 * Get the owner, group and world SIDs.
2696 */
2697
2698 if (lp_profile_acls(SNUM(fsp->conn))) {
2699 /* For WXP SP1 the owner must be administrators. */
2700 sid_copy(&owner_sid, &global_sid_Builtin_Administrators);
2701 sid_copy(&group_sid, &global_sid_Builtin_Users);
2702 num_profile_acls = 2;
2703 } else {
2704 create_file_sids(&sbuf, &owner_sid, &group_sid);
2705 }
2706
2707 if ((security_info & DACL_SECURITY_INFORMATION) && !(security_info & PROTECTED_DACL_SECURITY_INFORMATION)) {
2708
2709 /*
2710 * In the optimum case Creator Owner and Creator Group would be used for
2711 * the ACL_USER_OBJ and ACL_GROUP_OBJ entries, respectively, but this
2712 * would lead to usability problems under Windows: The Creator entries
2713 * are only available in browse lists of directories and not for files;
2714 * additionally the identity of the owning group couldn't be determined.
2715 * We therefore use those identities only for Default ACLs.
2716 */
2717
2718 /* Create the canon_ace lists. */
2719 file_ace = canonicalise_acl( fsp, posix_acl, &sbuf, &owner_sid, &group_sid, pal, SMB_ACL_TYPE_ACCESS );
2720
2721 /* We must have *some* ACLS. */
2722
2723 if (count_canon_ace_list(file_ace) == 0) {
2724 DEBUG(0,("get_nt_acl : No ACLs on file (%s) !\n", fsp->fsp_name ));
2725 return 0;
2726 }
2727
2728 if (fsp->is_directory && dir_acl) {
2729 dir_ace = canonicalise_acl(fsp, dir_acl, &sbuf,
2730 &global_sid_Creator_Owner,
2731 &global_sid_Creator_Group, pal, SMB_ACL_TYPE_DEFAULT );
2732 }
2733
2734 /*
2735 * Create the NT ACE list from the canonical ace lists.
2736 */
2737
2738 {
2739 canon_ace *ace;
2740 int nt_acl_type;
2741 int i;
2742
2743 if (nt4_compatible_acls() && dir_ace) {
2744 /*
2745 * NT 4 chokes if an ACL contains an INHERIT_ONLY entry
2746 * but no non-INHERIT_ONLY entry for one SID. So we only
2747 * remove entries from the Access ACL if the
2748 * corresponding Default ACL entries have also been
2749 * removed. ACEs for CREATOR-OWNER and CREATOR-GROUP
2750 * are exceptions. We can do nothing
2751 * intelligent if the Default ACL contains entries that
2752 * are not also contained in the Access ACL, so this
2753 * case will still fail under NT 4.
2754 */
2755
2756 ace = canon_ace_entry_for(dir_ace, SMB_ACL_OTHER, NULL);
2757 if (ace && !ace->perms) {
2758 DLIST_REMOVE(dir_ace, ace);
2759 SAFE_FREE(ace);
2760
2761 ace = canon_ace_entry_for(file_ace, SMB_ACL_OTHER, NULL);
2762 if (ace && !ace->perms) {
2763 DLIST_REMOVE(file_ace, ace);
2764 SAFE_FREE(ace);
2765 }
2766 }
2767
2768 /*
2769 * WinNT doesn't usually have Creator Group
2770 * in browse lists, so we send this entry to
2771 * WinNT even if it contains no relevant
2772 * permissions. Once we can add
2773 * Creator Group to browse lists we can
2774 * re-enable this.
2775 */
2776
2777 #if 0
2778 ace = canon_ace_entry_for(dir_ace, SMB_ACL_GROUP_OBJ, NULL);
2779 if (ace && !ace->perms) {
2780 DLIST_REMOVE(dir_ace, ace);
2781 SAFE_FREE(ace);
2782 }
2783 #endif
2784
2785 ace = canon_ace_entry_for(file_ace, SMB_ACL_GROUP_OBJ, NULL);
2786 if (ace && !ace->perms) {
2787 DLIST_REMOVE(file_ace, ace);
2788 SAFE_FREE(ace);
2789 }
2790 }
2791
2792 num_acls = count_canon_ace_list(file_ace);
2793 num_dir_acls = count_canon_ace_list(dir_ace);
2794
2795 /* Allocate the ace list. */
2796 if ((nt_ace_list = (SEC_ACE *)malloc((num_acls + num_profile_acls + num_dir_acls)* sizeof(SEC_ACE))) == NULL) {
2797 DEBUG(0,("get_nt_acl: Unable to malloc space for nt_ace_list.\n"));
2798 goto done;
2799 }
2800
2801 memset(nt_ace_list, '\0', (num_acls + num_dir_acls) * sizeof(SEC_ACE) );
2802
2803 /*
2804 * Create the NT ACE list from the canonical ace lists.
2805 */
2806
2807 ace = file_ace;
2808
2809 for (i = 0; i < num_acls; i++, ace = ace->next) {
2810 SEC_ACCESS acc;
2811
2812 acc = map_canon_ace_perms(&nt_acl_type, &owner_sid, ace );
2813 init_sec_ace(&nt_ace_list[num_aces++], &ace->trustee, nt_acl_type, acc, ace->inherited ? SEC_ACE_FLAG_INHERITED_ACE : 0);
2814 }
2815
2816 /* The User must have access to a profile share - even if we can't map the SID. */
2817 if (lp_profile_acls(SNUM(fsp->conn))) {
2818 SEC_ACCESS acc;
2819
2820 init_sec_access(&acc,FILE_GENERIC_ALL);
2821 init_sec_ace(&nt_ace_list[num_aces++], &global_sid_Builtin_Users, SEC_ACE_TYPE_ACCESS_ALLOWED,
2822 acc, 0);
2823 }
2824
2825 ace = dir_ace;
2826
2827 for (i = 0; i < num_dir_acls; i++, ace = ace->next) {
2828 SEC_ACCESS acc;
2829
2830 acc = map_canon_ace_perms(&nt_acl_type, &owner_sid, ace );
2831 init_sec_ace(&nt_ace_list[num_aces++], &ace->trustee, nt_acl_type, acc,
2832 SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT|
2833 SEC_ACE_FLAG_INHERIT_ONLY|
2834 (ace->inherited ? SEC_ACE_FLAG_INHERITED_ACE : 0));
2835 }
2836
2837 /* The User must have access to a profile share - even if we can't map the SID. */
2838 if (lp_profile_acls(SNUM(fsp->conn))) {
2839 SEC_ACCESS acc;
2840
2841 init_sec_access(&acc,FILE_GENERIC_ALL);
2842 init_sec_ace(&nt_ace_list[num_aces++], &global_sid_Builtin_Users, SEC_ACE_TYPE_ACCESS_ALLOWED, acc,
2843 SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT|
2844 SEC_ACE_FLAG_INHERIT_ONLY|0);
2845 }
2846
2847 /*
2848 * Merge POSIX default ACLs and normal ACLs into one NT ACE.
2849 * Win2K needs this to get the inheritance correct when replacing ACLs
2850 * on a directory tree. Based on work by Jim @ IBM.
2851 */
2852
2853 num_aces = merge_default_aces(nt_ace_list, num_aces);
2854
2855 }
2856
2857 if (num_aces) {
2858 if((psa = make_sec_acl( main_loop_talloc_get(), NT4_ACL_REVISION, num_aces, nt_ace_list)) == NULL) {
2859 DEBUG(0,("get_nt_acl: Unable to malloc space for acl.\n"));
2860 goto done;
2861 }
2862 }
2863 } /* security_info & DACL_SECURITY_INFORMATION */
2864
2865 psd = make_standard_sec_desc( main_loop_talloc_get(),
2866 (security_info & OWNER_SECURITY_INFORMATION) ? &owner_sid : NULL,
2867 (security_info & GROUP_SECURITY_INFORMATION) ? &group_sid : NULL,
2868 psa,
2869 &sd_size);
2870
2871 if(!psd) {
2872 DEBUG(0,("get_nt_acl: Unable to malloc space for security descriptor.\n"));
2873 sd_size = 0;
2874 } else {
2875 /*
2876 * Windows 2000: The DACL_PROTECTED flag in the security
2877 * descriptor marks the ACL as non-inheriting, i.e., no
2878 * ACEs from higher level directories propagate to this
2879 * ACL. In the POSIX ACL model permissions are only
2880 * inherited at file create time, so ACLs never contain
2881 * any ACEs that are inherited dynamically. The DACL_PROTECTED
2882 * flag doesn't seem to bother Windows NT.
2883 */
2884 if (get_protected_flag(pal))
2885 psd->type |= SE_DESC_DACL_PROTECTED;
2886 }
2887
2888 if (psd->dacl)
2889 dacl_sort_into_canonical_order(psd->dacl->ace, (unsigned int)psd->dacl->num_aces);
2890
2891 *ppdesc = psd;
2892
2893 done:
2894
2895 if (posix_acl)
2896 SMB_VFS_SYS_ACL_FREE_ACL(conn, posix_acl);
2897 if (dir_acl)
2898 SMB_VFS_SYS_ACL_FREE_ACL(conn, dir_acl);
2899 free_canon_ace_list(file_ace);
2900 free_canon_ace_list(dir_ace);
2901 free_inherited_info(pal);
2902 SAFE_FREE(nt_ace_list);
2903
2904 return sd_size;
2905 }
2906
2907 /****************************************************************************
2908 Try to chown a file. We will be able to chown it under the following conditions.
2909
2910 1) If we have root privileges, then it will just work.
2911 2) If we have write permission to the file and dos_filemodes is set
2912 then allow chown to the currently authenticated user.
2913 ****************************************************************************/
2914
2915 static int try_chown(connection_struct *conn, const char *fname, uid_t uid, gid_t gid)
2916 {
2917 int ret;
2918 extern struct current_user current_user;
2919 files_struct *fsp;
2920 SMB_STRUCT_STAT st;
2921
2922 /* try the direct way first */
2923 ret = SMB_VFS_CHOWN(conn, fname, uid, gid);
2924 if (ret == 0)
2925 return 0;
2926
2927 if(!CAN_WRITE(conn) || !lp_dos_filemode(SNUM(conn)))
2928 return -1;
2929
2930 if (SMB_VFS_STAT(conn,fname,&st))
2931 return -1;
2932
2933 fsp = open_file_fchmod(conn,fname,&st);
2934 if (!fsp)
2935 return -1;
2936
2937 /* only allow chown to the current user. This is more secure,
2938 and also copes with the case where the SID in a take ownership ACL is
2939 a local SID on the users workstation
2940 */
2941 uid = current_user.uid;
2942
2943 become_root();
2944 /* Keep the current file gid the same. */
2945 ret = SMB_VFS_FCHOWN(fsp, fsp->fd, uid, (gid_t)-1);
2946 unbecome_root();
2947
2948 close_file_fchmod(fsp);
2949
2950 return ret;
2951 }
2952
2953 /****************************************************************************
2954 Reply to set a security descriptor on an fsp. security_info_sent is the
2955 description of the following NT ACL.
2956 This should be the only external function needed for the UNIX style set ACL.
2957 ****************************************************************************/
2958
2959 BOOL set_nt_acl(files_struct *fsp, uint32 security_info_sent, SEC_DESC *psd)
2960 {
2961 connection_struct *conn = fsp->conn;
2962 uid_t user = (uid_t)-1;
2963 gid_t grp = (gid_t)-1;
2964 SMB_STRUCT_STAT sbuf;
2965 DOM_SID file_owner_sid;
2966 DOM_SID file_grp_sid;
2967 canon_ace *file_ace_list = NULL;
2968 canon_ace *dir_ace_list = NULL;
2969 BOOL acl_perms = False;
2970 mode_t orig_mode = (mode_t)0;
2971 uid_t orig_uid;
2972 gid_t orig_gid;
2973 BOOL need_chown = False;
2974 extern struct current_user current_user;
2975
2976 DEBUG(10,("set_nt_acl: called for file %s\n", fsp->fsp_name ));
2977
2978 if (!CAN_WRITE(conn)) {
2979 DEBUG(10,("set acl rejected on read-only share\n"));
2980 return False;
2981 }
2982
2983 /*
2984 * Get the current state of the file.
2985 */
2986
2987 if(fsp->is_directory || fsp->fd == -1) {
2988 if(SMB_VFS_STAT(fsp->conn,fsp->fsp_name, &sbuf) != 0)
2989 return False;
2990 } else {
2991 if(SMB_VFS_FSTAT(fsp,fsp->fd,&sbuf) != 0)
2992 return False;
2993 }
2994
2995 /* Save the original elements we check against. */
2996 orig_mode = sbuf.st_mode;
2997 orig_uid = sbuf.st_uid;
2998 orig_gid = sbuf.st_gid;
2999
3000 /*
3001 * Unpack the user/group/world id's.
3002 */
3003
3004 if (!unpack_nt_owners( SNUM(conn), &sbuf, &user, &grp, security_info_sent, psd))
3005 return False;
3006
3007 /*
3008 * Do we need to chown ?
3009 */
3010
3011 if (((user != (uid_t)-1) && (orig_uid != user)) || (( grp != (gid_t)-1) && (orig_gid != grp)))
3012 need_chown = True;
3013
3014 /*
3015 * Chown before setting ACL only if we don't change the user, or
3016 * if we change to the current user, but not if we want to give away
3017 * the file.
3018 */
3019
3020 if (need_chown && (user == (uid_t)-1 || user == current_user.uid)) {
3021
3022 DEBUG(3,("set_nt_acl: chown %s. uid = %u, gid = %u.\n",
3023 fsp->fsp_name, (unsigned int)user, (unsigned int)grp ));
3024
3025 if(try_chown( fsp->conn, fsp->fsp_name, user, grp) == -1) {
3026 DEBUG(3,("set_nt_acl: chown %s, %u, %u failed. Error = %s.\n",
3027 fsp->fsp_name, (unsigned int)user, (unsigned int)grp, strerror(errno) ));
3028 return False;
3029 }
3030
3031 /*
3032 * Recheck the current state of the file, which may have changed.
3033 * (suid/sgid bits, for instance)
3034 */
3035
3036 if(fsp->is_directory) {
3037 if(SMB_VFS_STAT(fsp->conn, fsp->fsp_name, &sbuf) != 0) {
3038 return False;
3039 }
3040 } else {
3041
3042 int ret;
3043
3044 if(fsp->fd == -1)
3045 ret = SMB_VFS_STAT(fsp->conn, fsp->fsp_name, &sbuf);
3046 else
3047 ret = SMB_VFS_FSTAT(fsp,fsp->fd,&sbuf);
3048
3049 if(ret != 0)
3050 return False;
3051 }
3052
3053 /* Save the original elements we check against. */
3054 orig_mode = sbuf.st_mode;
3055 orig_uid = sbuf.st_uid;
3056 orig_gid = sbuf.st_gid;
3057
3058 /* We did it, don't try again */
3059 need_chown = False;
3060 }
3061
3062 create_file_sids(&sbuf, &file_owner_sid, &file_grp_sid);
3063
3064 acl_perms = unpack_canon_ace( fsp, &sbuf, &file_owner_sid, &file_grp_sid,
3065 &file_ace_list, &dir_ace_list, security_info_sent, psd);
3066
3067 /* Ignore W2K traverse DACL set. */
3068 if (file_ace_list || dir_ace_list) {
3069
3070 if (!acl_perms) {
3071 DEBUG(3,("set_nt_acl: cannot set permissions\n"));
3072 free_canon_ace_list(file_ace_list);
3073 free_canon_ace_list(dir_ace_list);
3074 return False;
3075 }
3076
3077 /*
3078 * Only change security if we got a DACL.
3079 */
3080
3081 if((security_info_sent & DACL_SECURITY_INFORMATION) && (psd->dacl != NULL)) {
3082
3083 BOOL acl_set_support = False;
3084 BOOL ret = False;
3085
3086 /*
3087 * Try using the POSIX ACL set first. Fall back to chmod if
3088 * we have no ACL support on this filesystem.
3089 */
3090
3091 if (acl_perms && file_ace_list) {
3092 ret = set_canon_ace_list(fsp, file_ace_list, False, &acl_set_support);
3093 if (acl_set_support && ret == False) {
3094 DEBUG(3,("set_nt_acl: failed to set file acl on file %s (%s).\n", fsp->fsp_name, strerror(errno) ));
3095 free_canon_ace_list(file_ace_list);
3096 free_canon_ace_list(dir_ace_list);
3097 return False;
3098 }
3099 }
3100
3101 if (acl_perms && acl_set_support && fsp->is_directory) {
3102 if (dir_ace_list) {
3103 if (!set_canon_ace_list(fsp, dir_ace_list, True, &acl_set_support)) {
3104 DEBUG(3,("set_nt_acl: failed to set default acl on directory %s (%s).\n", fsp->fsp_name, strerror(errno) ));
3105 free_canon_ace_list(file_ace_list);
3106 free_canon_ace_list(dir_ace_list);
3107 return False;
3108 }
3109 } else {
3110
3111 /*
3112 * No default ACL - delete one if it exists.
3113 */
3114
3115 if (SMB_VFS_SYS_ACL_DELETE_DEF_FILE(conn, fsp->fsp_name) == -1) {
3116 DEBUG(3,("set_nt_acl: sys_acl_delete_def_file failed (%s)\n", strerror(errno)));
3117 free_canon_ace_list(file_ace_list);
3118 free_canon_ace_list(dir_ace_list);
3119 return False;
3120 }
3121 }
3122 }
3123
3124 if (acl_set_support)
3125 store_inheritance_attributes(fsp, file_ace_list, dir_ace_list,
3126 (psd->type & SE_DESC_DACL_PROTECTED) ? True : False);
3127
3128 /*
3129 * If we cannot set using POSIX ACLs we fall back to checking if we need to chmod.
3130 */
3131
3132 if(!acl_set_support && acl_perms) {
3133 mode_t posix_perms;
3134
3135 if (!convert_canon_ace_to_posix_perms( fsp, file_ace_list, &posix_perms)) {
3136 free_canon_ace_list(file_ace_list);
3137 free_canon_ace_list(dir_ace_list);
3138 DEBUG(3,("set_nt_acl: failed to convert file acl to posix permissions for file %s.\n",
3139 fsp->fsp_name ));
3140 return False;
3141 }
3142
3143 if (orig_mode != posix_perms) {
3144
3145 DEBUG(3,("set_nt_acl: chmod %s. perms = 0%o.\n",
3146 fsp->fsp_name, (unsigned int)posix_perms ));
3147
3148 if(SMB_VFS_CHMOD(conn,fsp->fsp_name, posix_perms) == -1) {
3149 DEBUG(3,("set_nt_acl: chmod %s, 0%o failed. Error = %s.\n",
3150 fsp->fsp_name, (unsigned int)posix_perms, strerror(errno) ));
3151 free_canon_ace_list(file_ace_list);
3152 free_canon_ace_list(dir_ace_list);
3153 return False;
3154 }
3155 }
3156 }
3157 }
3158
3159 free_canon_ace_list(file_ace_list);
3160 free_canon_ace_list(dir_ace_list);
3161 }
3162
3163 /* Any chown pending? */
3164 if (need_chown) {
3165
3166 DEBUG(3,("set_nt_acl: chown %s. uid = %u, gid = %u.\n",
3167 fsp->fsp_name, (unsigned int)user, (unsigned int)grp ));
3168
3169 if(try_chown( fsp->conn, fsp->fsp_name, user, grp) == -1) {
3170 DEBUG(3,("set_nt_acl: chown %s, %u, %u failed. Error = %s.\n",
3171 fsp->fsp_name, (unsigned int)user, (unsigned int)grp, strerror(errno) ));
3172 return False;
3173 }
3174 }
3175
3176 return True;
3177 }
3178
3179 /****************************************************************************
3180 Get the actual group bits stored on a file with an ACL. Has no effect if
3181 the file has no ACL. Needed in dosmode code where the stat() will return
3182 the mask bits, not the real group bits, for a file with an ACL.
3183 ****************************************************************************/
3184
3185 int get_acl_group_bits( connection_struct *conn, const char *fname, mode_t *mode )
3186 {
3187 int entry_id = SMB_ACL_FIRST_ENTRY;
3188 SMB_ACL_ENTRY_T entry;
3189 SMB_ACL_T posix_acl;
3190 int result = -1;
3191
3192 posix_acl = SMB_VFS_SYS_ACL_GET_FILE(conn, fname, SMB_ACL_TYPE_ACCESS);
3193 if (posix_acl == (SMB_ACL_T)NULL)
3194 return -1;
3195
3196 while (SMB_VFS_SYS_ACL_GET_ENTRY(conn, posix_acl, entry_id, &entry) == 1) {
3197 SMB_ACL_TAG_T tagtype;
3198 SMB_ACL_PERMSET_T permset;
3199
3200 /* get_next... */
3201 if (entry_id == SMB_ACL_FIRST_ENTRY)
3202 entry_id = SMB_ACL_NEXT_ENTRY;
3203
3204 if (SMB_VFS_SYS_ACL_GET_TAG_TYPE(conn, entry, &tagtype) ==-1)
3205 break;
3206
3207 if (tagtype == SMB_ACL_GROUP_OBJ) {
3208 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, entry, &permset) == -1) {
3209 break;
3210 } else {
3211 *mode &= ~(S_IRGRP|S_IWGRP|S_IXGRP);
3212 *mode |= (SMB_VFS_SYS_ACL_GET_PERM(conn, permset, SMB_ACL_READ) ? S_IRGRP : 0);
3213 *mode |= (SMB_VFS_SYS_ACL_GET_PERM(conn, permset, SMB_ACL_WRITE) ? S_IWGRP : 0);
3214 *mode |= (SMB_VFS_SYS_ACL_GET_PERM(conn, permset, SMB_ACL_EXECUTE) ? S_IXGRP : 0);
3215 result = 0;
3216 break;
3217 }
3218 }
3219 }
3220 SMB_VFS_SYS_ACL_FREE_ACL(conn, posix_acl);
3221 return result;
3222 }
3223
3224 /****************************************************************************
3225 Do a chmod by setting the ACL USER_OBJ, GROUP_OBJ and OTHER bits in an ACL
3226 and set the mask to rwx. Needed to preserve complex ACLs set by NT.
3227 ****************************************************************************/
3228
3229 static int chmod_acl_internals( connection_struct *conn, SMB_ACL_T posix_acl, mode_t mode)
3230 {
3231 int entry_id = SMB_ACL_FIRST_ENTRY;
3232 SMB_ACL_ENTRY_T entry;
3233 int num_entries = 0;
3234
3235 while ( SMB_VFS_SYS_ACL_GET_ENTRY(conn, posix_acl, entry_id, &entry) == 1) {
3236 SMB_ACL_TAG_T tagtype;
3237 SMB_ACL_PERMSET_T permset;
3238 mode_t perms;
3239
3240 /* get_next... */
3241 if (entry_id == SMB_ACL_FIRST_ENTRY)
3242 entry_id = SMB_ACL_NEXT_ENTRY;
3243
3244 if (SMB_VFS_SYS_ACL_GET_TAG_TYPE(conn, entry, &tagtype) == -1)
3245 return -1;
3246
3247 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, entry, &permset) == -1)
3248 return -1;
3249
3250 num_entries++;
3251
3252 switch(tagtype) {
3253 case SMB_ACL_USER_OBJ:
3254 perms = unix_perms_to_acl_perms(mode, S_IRUSR, S_IWUSR, S_IXUSR);
3255 break;
3256 case SMB_ACL_GROUP_OBJ:
3257 perms = unix_perms_to_acl_perms(mode, S_IRGRP, S_IWGRP, S_IXGRP);
3258 break;
3259 case SMB_ACL_MASK:
3260 /*
3261 * FIXME: The ACL_MASK entry permissions should really be set to
3262 * the union of the permissions of all ACL_USER,
3263 * ACL_GROUP_OBJ, and ACL_GROUP entries. That's what
3264 * acl_calc_mask() does, but Samba ACLs doesn't provide it.
3265 */
3266 perms = S_IRUSR|S_IWUSR|S_IXUSR;
3267 break;
3268 case SMB_ACL_OTHER:
3269 perms = unix_perms_to_acl_perms(mode, S_IROTH, S_IWOTH, S_IXOTH);
3270 break;
3271 default:
3272 continue;
3273 }
3274
3275 if (map_acl_perms_to_permset(conn, perms, &permset) == -1)
3276 return -1;
3277
3278 if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, entry, permset) == -1)
3279 return -1;
3280 }
3281
3282 /*
3283 * If this is a simple 3 element ACL or no elements then it's a standard
3284 * UNIX permission set. Just use chmod...
3285 */
3286
3287 if ((num_entries == 3) || (num_entries == 0))
3288 return -1;
3289
3290 return 0;
3291 }
3292
3293 /****************************************************************************
3294 Get the access ACL of FROM, do a chmod by setting the ACL USER_OBJ,
3295 GROUP_OBJ and OTHER bits in an ACL and set the mask to rwx. Set the
3296 resulting ACL on TO. Note that name is in UNIX character set.
3297 ****************************************************************************/
3298
3299 static int copy_access_acl(connection_struct *conn, const char *from, const char *to, mode_t mode)
3300 {
3301 SMB_ACL_T posix_acl = NULL;
3302 int ret = -1;
3303
3304 if ((posix_acl = SMB_VFS_SYS_ACL_GET_FILE(conn, from, SMB_ACL_TYPE_ACCESS)) == NULL)
3305 return -1;
3306
3307 if ((ret = chmod_acl_internals(conn, posix_acl, mode)) == -1)
3308 goto done;
3309
3310 ret = SMB_VFS_SYS_ACL_SET_FILE(conn, to, SMB_ACL_TYPE_ACCESS, posix_acl);
3311
3312 done:
3313
3314 SMB_VFS_SYS_ACL_FREE_ACL(conn, posix_acl);
3315 return ret;
3316 }
3317
3318 /****************************************************************************
3319 Do a chmod by setting the ACL USER_OBJ, GROUP_OBJ and OTHER bits in an ACL
3320 and set the mask to rwx. Needed to preserve complex ACLs set by NT.
3321 Note that name is in UNIX character set.
3322 ****************************************************************************/
3323
3324 int chmod_acl(connection_struct *conn, const char *name, mode_t mode)
3325 {
3326 return copy_access_acl(conn, name, name, mode);
3327 }
3328
3329 /****************************************************************************
3330 If "inherit permissions" is set and the parent directory has no default
3331 ACL but it does have an Access ACL, inherit this Access ACL to file name.
3332 ****************************************************************************/
3333
3334 int inherit_access_acl(connection_struct *conn, const char *name, mode_t mode)
3335 {
3336 pstring dirname;
3337 pstrcpy(dirname, parent_dirname(name));
3338
3339 if (!lp_inherit_perms(SNUM(conn)) || directory_has_default_acl(conn, dirname))
3340 return 0;
3341
3342 return copy_access_acl(conn, dirname, name, mode);
3343 }
3344
3345 /****************************************************************************
3346 Do an fchmod by setting the ACL USER_OBJ, GROUP_OBJ and OTHER bits in an ACL
3347 and set the mask to rwx. Needed to preserve complex ACLs set by NT.
3348 ****************************************************************************/
3349
3350 int fchmod_acl(files_struct *fsp, int fd, mode_t mode)
3351 {
3352 connection_struct *conn = fsp->conn;
3353 SMB_ACL_T posix_acl = NULL;
3354 int ret = -1;
3355
3356 if ((posix_acl = SMB_VFS_SYS_ACL_GET_FD(fsp, fd)) == NULL)
3357 return -1;
3358
3359 if ((ret = chmod_acl_internals(conn, posix_acl, mode)) == -1)
3360 goto done;
3361
3362 ret = SMB_VFS_SYS_ACL_SET_FD(fsp, fd, posix_acl);
3363
3364 done:
3365
3366 SMB_VFS_SYS_ACL_FREE_ACL(conn, posix_acl);
3367 return ret;
3368 }
3369
3370 /****************************************************************************
3371 Check for an existing default POSIX ACL on a directory.
3372 ****************************************************************************/
3373
3374 BOOL directory_has_default_acl(connection_struct *conn, const char *fname)
3375 {
3376 SMB_ACL_T dir_acl = SMB_VFS_SYS_ACL_GET_FILE( conn, fname, SMB_ACL_TYPE_DEFAULT);
3377 BOOL has_acl = False;
3378 SMB_ACL_ENTRY_T entry;
3379
3380 if (dir_acl != NULL && (SMB_VFS_SYS_ACL_GET_ENTRY(conn, dir_acl, SMB_ACL_FIRST_ENTRY, &entry) == 1))
3381 has_acl = True;
3382
3383 if (dir_acl)
3384 SMB_VFS_SYS_ACL_FREE_ACL(conn, dir_acl);
3385 return has_acl;
3386 }
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