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.
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.
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.
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.
24 extern struct current_user current_user;
25 extern struct generic_mapping file_generic_mapping;
28 #define DBGC_CLASS DBGC_ACLS
30 /****************************************************************************
31 Data structures representing the internal ACE format.
32 ****************************************************************************/
34 enum ace_owner {UID_ACE, GID_ACE, WORLD_ACE};
35 enum ace_attribute {ALLOW_ACE, DENY_ACE}; /* Used for incoming NT ACLS. */
37 typedef union posix_id {
43 typedef struct canon_ace {
44 struct canon_ace *next, *prev;
46 mode_t perms; /* Only use S_I(R|W|X)USR mode bits here. */
48 enum ace_owner owner_type;
49 enum ace_attribute attr;
54 #define ALL_ACE_PERMS (S_IRUSR|S_IWUSR|S_IXUSR)
57 * EA format of user.SAMBA_PAI (Samba_Posix_Acl_Interitance)
60 * | 1 | 1 | 2 | 2 | ....
61 * +------+------+-------------+---------------------+-------------+--------------------+
62 * | vers | flag | num_entries | num_default_entries | ..entries.. | default_entries... |
63 * +------+------+-------------+---------------------+-------------+--------------------+
66 #define PAI_VERSION_OFFSET 0
67 #define PAI_FLAG_OFFSET 1
68 #define PAI_NUM_ENTRIES_OFFSET 2
69 #define PAI_NUM_DEFAULT_ENTRIES_OFFSET 4
70 #define PAI_ENTRIES_BASE 6
73 #define PAI_ACL_FLAG_PROTECTED 0x1
74 #define PAI_ENTRY_LENGTH 5
77 * In memory format of user.SAMBA_PAI attribute.
81 struct pai_entry *next, *prev;
82 enum ace_owner owner_type;
88 unsigned int num_entries;
89 struct pai_entry *entry_list;
90 unsigned int num_def_entries;
91 struct pai_entry *def_entry_list;
94 /************************************************************************
95 Return a uint32 of the pai_entry principal.
96 ************************************************************************/
98 static uint32 get_pai_entry_val(struct pai_entry *paie)
100 switch (paie->owner_type) {
102 DEBUG(10,("get_pai_entry_val: uid = %u\n", (unsigned int)paie->unix_ug.uid ));
103 return (uint32)paie->unix_ug.uid;
105 DEBUG(10,("get_pai_entry_val: gid = %u\n", (unsigned int)paie->unix_ug.gid ));
106 return (uint32)paie->unix_ug.gid;
109 DEBUG(10,("get_pai_entry_val: world ace\n"));
114 /************************************************************************
115 Return a uint32 of the entry principal.
116 ************************************************************************/
118 static uint32 get_entry_val(canon_ace *ace_entry)
120 switch (ace_entry->owner_type) {
122 DEBUG(10,("get_entry_val: uid = %u\n", (unsigned int)ace_entry->unix_ug.uid ));
123 return (uint32)ace_entry->unix_ug.uid;
125 DEBUG(10,("get_entry_val: gid = %u\n", (unsigned int)ace_entry->unix_ug.gid ));
126 return (uint32)ace_entry->unix_ug.gid;
129 DEBUG(10,("get_entry_val: world ace\n"));
134 /************************************************************************
135 Count the inherited entries.
136 ************************************************************************/
138 static unsigned int num_inherited_entries(canon_ace *ace_list)
140 unsigned int num_entries = 0;
142 for (; ace_list; ace_list = ace_list->next)
143 if (ace_list->inherited)
148 /************************************************************************
149 Create the on-disk format. Caller must free.
150 ************************************************************************/
152 static char *create_pai_buf(canon_ace *file_ace_list, canon_ace *dir_ace_list, BOOL pai_protected, size_t *store_size)
154 char *pai_buf = NULL;
155 canon_ace *ace_list = NULL;
156 char *entry_offset = NULL;
157 unsigned int num_entries = 0;
158 unsigned int num_def_entries = 0;
160 for (ace_list = file_ace_list; ace_list; ace_list = ace_list->next)
161 if (ace_list->inherited)
164 for (ace_list = dir_ace_list; ace_list; ace_list = ace_list->next)
165 if (ace_list->inherited)
168 DEBUG(10,("create_pai_buf: num_entries = %u, num_def_entries = %u\n", num_entries, num_def_entries ));
170 *store_size = PAI_ENTRIES_BASE + ((num_entries + num_def_entries)*PAI_ENTRY_LENGTH);
172 pai_buf = (char *)SMB_MALLOC(*store_size);
177 /* Set up the header. */
178 memset(pai_buf, '\0', PAI_ENTRIES_BASE);
179 SCVAL(pai_buf,PAI_VERSION_OFFSET,PAI_VERSION);
180 SCVAL(pai_buf,PAI_FLAG_OFFSET,(pai_protected ? PAI_ACL_FLAG_PROTECTED : 0));
181 SSVAL(pai_buf,PAI_NUM_ENTRIES_OFFSET,num_entries);
182 SSVAL(pai_buf,PAI_NUM_DEFAULT_ENTRIES_OFFSET,num_def_entries);
184 entry_offset = pai_buf + PAI_ENTRIES_BASE;
186 for (ace_list = file_ace_list; ace_list; ace_list = ace_list->next) {
187 if (ace_list->inherited) {
188 uint8 type_val = (unsigned char)ace_list->owner_type;
189 uint32 entry_val = get_entry_val(ace_list);
191 SCVAL(entry_offset,0,type_val);
192 SIVAL(entry_offset,1,entry_val);
193 entry_offset += PAI_ENTRY_LENGTH;
197 for (ace_list = dir_ace_list; ace_list; ace_list = ace_list->next) {
198 if (ace_list->inherited) {
199 uint8 type_val = (unsigned char)ace_list->owner_type;
200 uint32 entry_val = get_entry_val(ace_list);
202 SCVAL(entry_offset,0,type_val);
203 SIVAL(entry_offset,1,entry_val);
204 entry_offset += PAI_ENTRY_LENGTH;
211 /************************************************************************
212 Store the user.SAMBA_PAI attribute on disk.
213 ************************************************************************/
215 static void store_inheritance_attributes(files_struct *fsp, canon_ace *file_ace_list,
216 canon_ace *dir_ace_list, BOOL pai_protected)
222 if (!lp_map_acl_inherit(SNUM(fsp->conn)))
226 * Don't store if this ACL isn't protected and
227 * none of the entries in it are marked as inherited.
230 if (!pai_protected && num_inherited_entries(file_ace_list) == 0 && num_inherited_entries(dir_ace_list) == 0) {
231 /* Instead just remove the attribute if it exists. */
232 if (fsp->fh->fd != -1)
233 SMB_VFS_FREMOVEXATTR(fsp, fsp->fh->fd, SAMBA_POSIX_INHERITANCE_EA_NAME);
235 SMB_VFS_REMOVEXATTR(fsp->conn, fsp->fsp_name, SAMBA_POSIX_INHERITANCE_EA_NAME);
239 pai_buf = create_pai_buf(file_ace_list, dir_ace_list, pai_protected, &store_size);
241 if (fsp->fh->fd != -1)
242 ret = SMB_VFS_FSETXATTR(fsp, fsp->fh->fd, SAMBA_POSIX_INHERITANCE_EA_NAME,
243 pai_buf, store_size, 0);
245 ret = SMB_VFS_SETXATTR(fsp->conn,fsp->fsp_name, SAMBA_POSIX_INHERITANCE_EA_NAME,
246 pai_buf, store_size, 0);
250 DEBUG(10,("store_inheritance_attribute:%s for file %s\n", pai_protected ? " (protected)" : "", fsp->fsp_name));
251 if (ret == -1 && !no_acl_syscall_error(errno))
252 DEBUG(1,("store_inheritance_attribute: Error %s\n", strerror(errno) ));
255 /************************************************************************
256 Delete the in memory inheritance info.
257 ************************************************************************/
259 static void free_inherited_info(struct pai_val *pal)
262 struct pai_entry *paie, *paie_next;
263 for (paie = pal->entry_list; paie; paie = paie_next) {
264 paie_next = paie->next;
267 for (paie = pal->def_entry_list; paie; paie = paie_next) {
268 paie_next = paie->next;
275 /************************************************************************
276 Was this ACL protected ?
277 ************************************************************************/
279 static BOOL get_protected_flag(struct pai_val *pal)
283 return pal->pai_protected;
286 /************************************************************************
287 Was this ACE inherited ?
288 ************************************************************************/
290 static BOOL get_inherited_flag(struct pai_val *pal, canon_ace *ace_entry, BOOL default_ace)
292 struct pai_entry *paie;
297 /* If the entry exists it is inherited. */
298 for (paie = (default_ace ? pal->def_entry_list : pal->entry_list); paie; paie = paie->next) {
299 if (ace_entry->owner_type == paie->owner_type &&
300 get_entry_val(ace_entry) == get_pai_entry_val(paie))
306 /************************************************************************
307 Ensure an attribute just read is valid.
308 ************************************************************************/
310 static BOOL check_pai_ok(char *pai_buf, size_t pai_buf_data_size)
313 uint16 num_def_entries;
315 if (pai_buf_data_size < PAI_ENTRIES_BASE) {
316 /* Corrupted - too small. */
320 if (CVAL(pai_buf,PAI_VERSION_OFFSET) != PAI_VERSION)
323 num_entries = SVAL(pai_buf,PAI_NUM_ENTRIES_OFFSET);
324 num_def_entries = SVAL(pai_buf,PAI_NUM_DEFAULT_ENTRIES_OFFSET);
326 /* Check the entry lists match. */
327 /* Each entry is 5 bytes (type plus 4 bytes of uid or gid). */
329 if (((num_entries + num_def_entries)*PAI_ENTRY_LENGTH) + PAI_ENTRIES_BASE != pai_buf_data_size)
336 /************************************************************************
337 Convert to in-memory format.
338 ************************************************************************/
340 static struct pai_val *create_pai_val(char *buf, size_t size)
343 struct pai_val *paiv = NULL;
346 if (!check_pai_ok(buf, size))
349 paiv = SMB_MALLOC_P(struct pai_val);
353 memset(paiv, '\0', sizeof(struct pai_val));
355 paiv->pai_protected = (CVAL(buf,PAI_FLAG_OFFSET) == PAI_ACL_FLAG_PROTECTED);
357 paiv->num_entries = SVAL(buf,PAI_NUM_ENTRIES_OFFSET);
358 paiv->num_def_entries = SVAL(buf,PAI_NUM_DEFAULT_ENTRIES_OFFSET);
360 entry_offset = buf + PAI_ENTRIES_BASE;
362 DEBUG(10,("create_pai_val:%s num_entries = %u, num_def_entries = %u\n",
363 paiv->pai_protected ? " (pai_protected)" : "", paiv->num_entries, paiv->num_def_entries ));
365 for (i = 0; i < paiv->num_entries; i++) {
366 struct pai_entry *paie;
368 paie = SMB_MALLOC_P(struct pai_entry);
370 free_inherited_info(paiv);
374 paie->owner_type = (enum ace_owner)CVAL(entry_offset,0);
375 switch( paie->owner_type) {
377 paie->unix_ug.uid = (uid_t)IVAL(entry_offset,1);
378 DEBUG(10,("create_pai_val: uid = %u\n", (unsigned int)paie->unix_ug.uid ));
381 paie->unix_ug.gid = (gid_t)IVAL(entry_offset,1);
382 DEBUG(10,("create_pai_val: gid = %u\n", (unsigned int)paie->unix_ug.gid ));
385 paie->unix_ug.world = -1;
386 DEBUG(10,("create_pai_val: world ace\n"));
389 free_inherited_info(paiv);
392 entry_offset += PAI_ENTRY_LENGTH;
393 DLIST_ADD(paiv->entry_list, paie);
396 for (i = 0; i < paiv->num_def_entries; i++) {
397 struct pai_entry *paie;
399 paie = SMB_MALLOC_P(struct pai_entry);
401 free_inherited_info(paiv);
405 paie->owner_type = (enum ace_owner)CVAL(entry_offset,0);
406 switch( paie->owner_type) {
408 paie->unix_ug.uid = (uid_t)IVAL(entry_offset,1);
409 DEBUG(10,("create_pai_val: (def) uid = %u\n", (unsigned int)paie->unix_ug.uid ));
412 paie->unix_ug.gid = (gid_t)IVAL(entry_offset,1);
413 DEBUG(10,("create_pai_val: (def) gid = %u\n", (unsigned int)paie->unix_ug.gid ));
416 paie->unix_ug.world = -1;
417 DEBUG(10,("create_pai_val: (def) world ace\n"));
420 free_inherited_info(paiv);
423 entry_offset += PAI_ENTRY_LENGTH;
424 DLIST_ADD(paiv->def_entry_list, paie);
430 /************************************************************************
431 Load the user.SAMBA_PAI attribute.
432 ************************************************************************/
434 static struct pai_val *load_inherited_info(files_struct *fsp)
437 size_t pai_buf_size = 1024;
438 struct pai_val *paiv = NULL;
441 if (!lp_map_acl_inherit(SNUM(fsp->conn)))
444 if ((pai_buf = (char *)SMB_MALLOC(pai_buf_size)) == NULL)
448 if (fsp->fh->fd != -1)
449 ret = SMB_VFS_FGETXATTR(fsp, fsp->fh->fd, SAMBA_POSIX_INHERITANCE_EA_NAME,
450 pai_buf, pai_buf_size);
452 ret = SMB_VFS_GETXATTR(fsp->conn,fsp->fsp_name,SAMBA_POSIX_INHERITANCE_EA_NAME,
453 pai_buf, pai_buf_size);
456 if (errno != ERANGE) {
459 /* Buffer too small - enlarge it. */
462 if (pai_buf_size > 1024*1024) {
463 return NULL; /* Limit malloc to 1mb. */
465 if ((pai_buf = (char *)SMB_MALLOC(pai_buf_size)) == NULL)
470 DEBUG(10,("load_inherited_info: ret = %lu for file %s\n", (unsigned long)ret, fsp->fsp_name));
473 /* No attribute or not supported. */
475 if (errno != ENOATTR)
476 DEBUG(10,("load_inherited_info: Error %s\n", strerror(errno) ));
479 DEBUG(10,("load_inherited_info: Error %s\n", strerror(errno) ));
485 paiv = create_pai_val(pai_buf, ret);
487 if (paiv && paiv->pai_protected)
488 DEBUG(10,("load_inherited_info: ACL is protected for file %s\n", fsp->fsp_name));
494 /****************************************************************************
495 Functions to manipulate the internal ACE format.
496 ****************************************************************************/
498 /****************************************************************************
499 Count a linked list of canonical ACE entries.
500 ****************************************************************************/
502 static size_t count_canon_ace_list( canon_ace *list_head )
507 for (ace = list_head; ace; ace = ace->next)
513 /****************************************************************************
514 Free a linked list of canonical ACE entries.
515 ****************************************************************************/
517 static void free_canon_ace_list( canon_ace *list_head )
519 canon_ace *list, *next;
521 for (list = list_head; list; list = next) {
523 DLIST_REMOVE(list_head, list);
528 /****************************************************************************
529 Function to duplicate a canon_ace entry.
530 ****************************************************************************/
532 static canon_ace *dup_canon_ace( canon_ace *src_ace)
534 canon_ace *dst_ace = SMB_MALLOC_P(canon_ace);
540 dst_ace->prev = dst_ace->next = NULL;
544 /****************************************************************************
545 Print out a canon ace.
546 ****************************************************************************/
548 static void print_canon_ace(canon_ace *pace, int num)
552 dbgtext( "canon_ace index %d. Type = %s ", num, pace->attr == ALLOW_ACE ? "allow" : "deny" );
553 dbgtext( "SID = %s ", sid_to_string( str, &pace->trustee));
554 if (pace->owner_type == UID_ACE) {
555 const char *u_name = uidtoname(pace->unix_ug.uid);
556 dbgtext( "uid %u (%s) ", (unsigned int)pace->unix_ug.uid, u_name );
557 } else if (pace->owner_type == GID_ACE) {
558 char *g_name = gidtoname(pace->unix_ug.gid);
559 dbgtext( "gid %u (%s) ", (unsigned int)pace->unix_ug.gid, g_name );
562 switch (pace->type) {
564 dbgtext( "SMB_ACL_USER ");
566 case SMB_ACL_USER_OBJ:
567 dbgtext( "SMB_ACL_USER_OBJ ");
570 dbgtext( "SMB_ACL_GROUP ");
572 case SMB_ACL_GROUP_OBJ:
573 dbgtext( "SMB_ACL_GROUP_OBJ ");
576 dbgtext( "SMB_ACL_OTHER ");
583 dbgtext( "(inherited) ");
585 dbgtext( "%c", pace->perms & S_IRUSR ? 'r' : '-');
586 dbgtext( "%c", pace->perms & S_IWUSR ? 'w' : '-');
587 dbgtext( "%c\n", pace->perms & S_IXUSR ? 'x' : '-');
590 /****************************************************************************
591 Print out a canon ace list.
592 ****************************************************************************/
594 static void print_canon_ace_list(const char *name, canon_ace *ace_list)
598 if( DEBUGLVL( 10 )) {
599 dbgtext( "print_canon_ace_list: %s\n", name );
600 for (;ace_list; ace_list = ace_list->next, count++)
601 print_canon_ace(ace_list, count );
605 /****************************************************************************
606 Map POSIX ACL perms to canon_ace permissions (a mode_t containing only S_(R|W|X)USR bits).
607 ****************************************************************************/
609 static mode_t convert_permset_to_mode_t(connection_struct *conn, SMB_ACL_PERMSET_T permset)
613 ret |= (SMB_VFS_SYS_ACL_GET_PERM(conn, permset, SMB_ACL_READ) ? S_IRUSR : 0);
614 ret |= (SMB_VFS_SYS_ACL_GET_PERM(conn, permset, SMB_ACL_WRITE) ? S_IWUSR : 0);
615 ret |= (SMB_VFS_SYS_ACL_GET_PERM(conn, permset, SMB_ACL_EXECUTE) ? S_IXUSR : 0);
620 /****************************************************************************
621 Map generic UNIX permissions to canon_ace permissions (a mode_t containing only S_(R|W|X)USR bits).
622 ****************************************************************************/
624 static mode_t unix_perms_to_acl_perms(mode_t mode, int r_mask, int w_mask, int x_mask)
638 /****************************************************************************
639 Map canon_ace permissions (a mode_t containing only S_(R|W|X)USR bits) to
640 an SMB_ACL_PERMSET_T.
641 ****************************************************************************/
643 static int map_acl_perms_to_permset(connection_struct *conn, mode_t mode, SMB_ACL_PERMSET_T *p_permset)
645 if (SMB_VFS_SYS_ACL_CLEAR_PERMS(conn, *p_permset) == -1)
647 if (mode & S_IRUSR) {
648 if (SMB_VFS_SYS_ACL_ADD_PERM(conn, *p_permset, SMB_ACL_READ) == -1)
651 if (mode & S_IWUSR) {
652 if (SMB_VFS_SYS_ACL_ADD_PERM(conn, *p_permset, SMB_ACL_WRITE) == -1)
655 if (mode & S_IXUSR) {
656 if (SMB_VFS_SYS_ACL_ADD_PERM(conn, *p_permset, SMB_ACL_EXECUTE) == -1)
662 /****************************************************************************
663 Function to create owner and group SIDs from a SMB_STRUCT_STAT.
664 ****************************************************************************/
666 static void create_file_sids(SMB_STRUCT_STAT *psbuf, DOM_SID *powner_sid, DOM_SID *pgroup_sid)
668 uid_to_sid( powner_sid, psbuf->st_uid );
669 gid_to_sid( pgroup_sid, psbuf->st_gid );
672 /****************************************************************************
673 Is the identity in two ACEs equal ? Check both SID and uid/gid.
674 ****************************************************************************/
676 static BOOL identity_in_ace_equal(canon_ace *ace1, canon_ace *ace2)
678 if (sid_equal(&ace1->trustee, &ace2->trustee)) {
681 if (ace1->owner_type == ace2->owner_type) {
682 if (ace1->owner_type == UID_ACE &&
683 ace1->unix_ug.uid == ace2->unix_ug.uid) {
685 } else if (ace1->owner_type == GID_ACE &&
686 ace1->unix_ug.gid == ace2->unix_ug.gid) {
693 /****************************************************************************
694 Merge aces with a common sid - if both are allow or deny, OR the permissions together and
695 delete the second one. If the first is deny, mask the permissions off and delete the allow
696 if the permissions become zero, delete the deny if the permissions are non zero.
697 ****************************************************************************/
699 static void merge_aces( canon_ace **pp_list_head )
701 canon_ace *list_head = *pp_list_head;
702 canon_ace *curr_ace_outer;
703 canon_ace *curr_ace_outer_next;
706 * First, merge allow entries with identical SIDs, and deny entries
707 * with identical SIDs.
710 for (curr_ace_outer = list_head; curr_ace_outer; curr_ace_outer = curr_ace_outer_next) {
712 canon_ace *curr_ace_next;
714 curr_ace_outer_next = curr_ace_outer->next; /* Save the link in case we delete. */
716 for (curr_ace = curr_ace_outer->next; curr_ace; curr_ace = curr_ace_next) {
718 curr_ace_next = curr_ace->next; /* Save the link in case of delete. */
720 if (identity_in_ace_equal(curr_ace, curr_ace_outer) &&
721 (curr_ace->attr == curr_ace_outer->attr)) {
723 if( DEBUGLVL( 10 )) {
724 dbgtext("merge_aces: Merging ACE's\n");
725 print_canon_ace( curr_ace_outer, 0);
726 print_canon_ace( curr_ace, 0);
729 /* Merge two allow or two deny ACE's. */
731 curr_ace_outer->perms |= curr_ace->perms;
732 DLIST_REMOVE(list_head, curr_ace);
734 curr_ace_outer_next = curr_ace_outer->next; /* We may have deleted the link. */
740 * Now go through and mask off allow permissions with deny permissions.
741 * We can delete either the allow or deny here as we know that each SID
742 * appears only once in the list.
745 for (curr_ace_outer = list_head; curr_ace_outer; curr_ace_outer = curr_ace_outer_next) {
747 canon_ace *curr_ace_next;
749 curr_ace_outer_next = curr_ace_outer->next; /* Save the link in case we delete. */
751 for (curr_ace = curr_ace_outer->next; curr_ace; curr_ace = curr_ace_next) {
753 curr_ace_next = curr_ace->next; /* Save the link in case of delete. */
756 * Subtract ACE's with different entries. Due to the ordering constraints
757 * we've put on the ACL, we know the deny must be the first one.
760 if (identity_in_ace_equal(curr_ace, curr_ace_outer) &&
761 (curr_ace_outer->attr == DENY_ACE) && (curr_ace->attr == ALLOW_ACE)) {
763 if( DEBUGLVL( 10 )) {
764 dbgtext("merge_aces: Masking ACE's\n");
765 print_canon_ace( curr_ace_outer, 0);
766 print_canon_ace( curr_ace, 0);
769 curr_ace->perms &= ~curr_ace_outer->perms;
771 if (curr_ace->perms == 0) {
774 * The deny overrides the allow. Remove the allow.
777 DLIST_REMOVE(list_head, curr_ace);
779 curr_ace_outer_next = curr_ace_outer->next; /* We may have deleted the link. */
784 * Even after removing permissions, there
785 * are still allow permissions - delete the deny.
786 * It is safe to delete the deny here,
787 * as we are guarenteed by the deny first
788 * ordering that all the deny entries for
789 * this SID have already been merged into one
790 * before we can get to an allow ace.
793 DLIST_REMOVE(list_head, curr_ace_outer);
794 SAFE_FREE(curr_ace_outer);
799 } /* end for curr_ace */
800 } /* end for curr_ace_outer */
802 /* We may have modified the list. */
804 *pp_list_head = list_head;
807 /****************************************************************************
808 Check if we need to return NT4.x compatible ACL entries.
809 ****************************************************************************/
811 static BOOL nt4_compatible_acls(void)
813 int compat = lp_acl_compatibility();
815 if (compat == ACL_COMPAT_AUTO) {
816 enum remote_arch_types ra_type = get_remote_arch();
818 /* Automatically adapt to client */
819 return (ra_type <= RA_WINNT);
821 return (compat == ACL_COMPAT_WINNT);
825 /****************************************************************************
826 Map canon_ace perms to permission bits NT.
827 The attr element is not used here - we only process deny entries on set,
828 not get. Deny entries are implicit on get with ace->perms = 0.
829 ****************************************************************************/
831 static SEC_ACCESS map_canon_ace_perms(int snum,
839 *pacl_type = SEC_ACE_TYPE_ACCESS_ALLOWED;
841 if (lp_acl_map_full_control(snum) && ((perms & ALL_ACE_PERMS) == ALL_ACE_PERMS)) {
843 nt_mask = UNIX_DIRECTORY_ACCESS_RWX;
845 nt_mask = UNIX_ACCESS_RWX;
847 } else if ((perms & ALL_ACE_PERMS) == (mode_t)0) {
849 * Windows NT refuses to display ACEs with no permissions in them (but
850 * they are perfectly legal with Windows 2000). If the ACE has empty
851 * permissions we cannot use 0, so we use the otherwise unused
852 * WRITE_OWNER permission, which we ignore when we set an ACL.
853 * We abstract this into a #define of UNIX_ACCESS_NONE to allow this
854 * to be changed in the future.
857 if (nt4_compatible_acls())
858 nt_mask = UNIX_ACCESS_NONE;
863 nt_mask |= ((perms & S_IRUSR) ? UNIX_DIRECTORY_ACCESS_R : 0 );
864 nt_mask |= ((perms & S_IWUSR) ? UNIX_DIRECTORY_ACCESS_W : 0 );
865 nt_mask |= ((perms & S_IXUSR) ? UNIX_DIRECTORY_ACCESS_X : 0 );
867 nt_mask |= ((perms & S_IRUSR) ? UNIX_ACCESS_R : 0 );
868 nt_mask |= ((perms & S_IWUSR) ? UNIX_ACCESS_W : 0 );
869 nt_mask |= ((perms & S_IXUSR) ? UNIX_ACCESS_X : 0 );
873 DEBUG(10,("map_canon_ace_perms: Mapped (UNIX) %x to (NT) %x\n",
874 (unsigned int)perms, (unsigned int)nt_mask ));
876 init_sec_access(&sa,nt_mask);
880 /****************************************************************************
881 Map NT perms to a UNIX mode_t.
882 ****************************************************************************/
884 #define FILE_SPECIFIC_READ_BITS (FILE_READ_DATA|FILE_READ_EA|FILE_READ_ATTRIBUTES)
885 #define FILE_SPECIFIC_WRITE_BITS (FILE_WRITE_DATA|FILE_APPEND_DATA|FILE_WRITE_EA|FILE_WRITE_ATTRIBUTES)
886 #define FILE_SPECIFIC_EXECUTE_BITS (FILE_EXECUTE)
888 static mode_t map_nt_perms( uint32 *mask, int type)
894 if((*mask) & GENERIC_ALL_ACCESS)
895 mode = S_IRUSR|S_IWUSR|S_IXUSR;
897 mode |= ((*mask) & (GENERIC_READ_ACCESS|FILE_SPECIFIC_READ_BITS)) ? S_IRUSR : 0;
898 mode |= ((*mask) & (GENERIC_WRITE_ACCESS|FILE_SPECIFIC_WRITE_BITS)) ? S_IWUSR : 0;
899 mode |= ((*mask) & (GENERIC_EXECUTE_ACCESS|FILE_SPECIFIC_EXECUTE_BITS)) ? S_IXUSR : 0;
903 if((*mask) & GENERIC_ALL_ACCESS)
904 mode = S_IRGRP|S_IWGRP|S_IXGRP;
906 mode |= ((*mask) & (GENERIC_READ_ACCESS|FILE_SPECIFIC_READ_BITS)) ? S_IRGRP : 0;
907 mode |= ((*mask) & (GENERIC_WRITE_ACCESS|FILE_SPECIFIC_WRITE_BITS)) ? S_IWGRP : 0;
908 mode |= ((*mask) & (GENERIC_EXECUTE_ACCESS|FILE_SPECIFIC_EXECUTE_BITS)) ? S_IXGRP : 0;
912 if((*mask) & GENERIC_ALL_ACCESS)
913 mode = S_IROTH|S_IWOTH|S_IXOTH;
915 mode |= ((*mask) & (GENERIC_READ_ACCESS|FILE_SPECIFIC_READ_BITS)) ? S_IROTH : 0;
916 mode |= ((*mask) & (GENERIC_WRITE_ACCESS|FILE_SPECIFIC_WRITE_BITS)) ? S_IWOTH : 0;
917 mode |= ((*mask) & (GENERIC_EXECUTE_ACCESS|FILE_SPECIFIC_EXECUTE_BITS)) ? S_IXOTH : 0;
925 /****************************************************************************
926 Unpack a SEC_DESC into a UNIX owner and group.
927 ****************************************************************************/
929 BOOL unpack_nt_owners(int snum, uid_t *puser, gid_t *pgrp, uint32 security_info_sent, SEC_DESC *psd)
937 if(security_info_sent == 0) {
938 DEBUG(0,("unpack_nt_owners: no security info sent !\n"));
943 * Validate the owner and group SID's.
946 memset(&owner_sid, '\0', sizeof(owner_sid));
947 memset(&grp_sid, '\0', sizeof(grp_sid));
949 DEBUG(5,("unpack_nt_owners: validating owner_sids.\n"));
952 * Don't immediately fail if the owner sid cannot be validated.
953 * This may be a group chown only set.
956 if (security_info_sent & OWNER_SECURITY_INFORMATION) {
957 sid_copy(&owner_sid, psd->owner_sid);
958 if (!sid_to_uid(&owner_sid, puser)) {
959 if (lp_force_unknown_acl_user(snum)) {
960 /* this allows take ownership to work
962 *puser = current_user.ut.uid;
964 DEBUG(3,("unpack_nt_owners: unable to validate"
965 " owner sid for %s\n",
966 sid_string_static(&owner_sid)));
973 * Don't immediately fail if the group sid cannot be validated.
974 * This may be an owner chown only set.
977 if (security_info_sent & GROUP_SECURITY_INFORMATION) {
978 sid_copy(&grp_sid, psd->group_sid);
979 if (!sid_to_gid( &grp_sid, pgrp)) {
980 if (lp_force_unknown_acl_user(snum)) {
981 /* this allows take group ownership to work
983 *pgrp = current_user.ut.gid;
985 DEBUG(3,("unpack_nt_owners: unable to validate"
992 DEBUG(5,("unpack_nt_owners: owner_sids validated.\n"));
997 /****************************************************************************
998 Ensure the enforced permissions for this share apply.
999 ****************************************************************************/
1001 static void apply_default_perms(files_struct *fsp, canon_ace *pace, mode_t type)
1003 int snum = SNUM(fsp->conn);
1004 mode_t and_bits = (mode_t)0;
1005 mode_t or_bits = (mode_t)0;
1007 /* Get the initial bits to apply. */
1009 if (fsp->is_directory) {
1010 and_bits = lp_dir_security_mask(snum);
1011 or_bits = lp_force_dir_security_mode(snum);
1013 and_bits = lp_security_mask(snum);
1014 or_bits = lp_force_security_mode(snum);
1017 /* Now bounce them into the S_USR space. */
1020 /* Ensure owner has read access. */
1021 pace->perms |= S_IRUSR;
1022 if (fsp->is_directory)
1023 pace->perms |= (S_IWUSR|S_IXUSR);
1024 and_bits = unix_perms_to_acl_perms(and_bits, S_IRUSR, S_IWUSR, S_IXUSR);
1025 or_bits = unix_perms_to_acl_perms(or_bits, S_IRUSR, S_IWUSR, S_IXUSR);
1028 and_bits = unix_perms_to_acl_perms(and_bits, S_IRGRP, S_IWGRP, S_IXGRP);
1029 or_bits = unix_perms_to_acl_perms(or_bits, S_IRGRP, S_IWGRP, S_IXGRP);
1032 and_bits = unix_perms_to_acl_perms(and_bits, S_IROTH, S_IWOTH, S_IXOTH);
1033 or_bits = unix_perms_to_acl_perms(or_bits, S_IROTH, S_IWOTH, S_IXOTH);
1037 pace->perms = ((pace->perms & and_bits)|or_bits);
1040 /****************************************************************************
1041 Check if a given uid/SID is in a group gid/SID. This is probably very
1042 expensive and will need optimisation. A *lot* of optimisation :-). JRA.
1043 ****************************************************************************/
1045 static BOOL uid_entry_in_group( canon_ace *uid_ace, canon_ace *group_ace )
1049 /* "Everyone" always matches every uid. */
1051 if (sid_equal(&group_ace->trustee, &global_sid_World))
1054 /* Assume that the current user is in the current group (force group) */
1056 if (uid_ace->unix_ug.uid == current_user.ut.uid && group_ace->unix_ug.gid == current_user.ut.gid)
1059 fstrcpy(u_name, uidtoname(uid_ace->unix_ug.uid));
1060 return user_in_group_sid(u_name, &group_ace->trustee);
1063 /****************************************************************************
1064 A well formed POSIX file or default ACL has at least 3 entries, a
1065 SMB_ACL_USER_OBJ, SMB_ACL_GROUP_OBJ, SMB_ACL_OTHER_OBJ.
1066 In addition, the owner must always have at least read access.
1067 When using this call on get_acl, the pst struct is valid and contains
1068 the mode of the file. When using this call on set_acl, the pst struct has
1069 been modified to have a mode containing the default for this file or directory
1071 ****************************************************************************/
1073 static BOOL ensure_canon_entry_valid(canon_ace **pp_ace,
1075 const DOM_SID *pfile_owner_sid,
1076 const DOM_SID *pfile_grp_sid,
1077 SMB_STRUCT_STAT *pst,
1081 BOOL got_user = False;
1082 BOOL got_grp = False;
1083 BOOL got_other = False;
1084 canon_ace *pace_other = NULL;
1086 for (pace = *pp_ace; pace; pace = pace->next) {
1087 if (pace->type == SMB_ACL_USER_OBJ) {
1090 apply_default_perms(fsp, pace, S_IRUSR);
1093 } else if (pace->type == SMB_ACL_GROUP_OBJ) {
1096 * Ensure create mask/force create mode is respected on set.
1100 apply_default_perms(fsp, pace, S_IRGRP);
1103 } else if (pace->type == SMB_ACL_OTHER) {
1106 * Ensure create mask/force create mode is respected on set.
1110 apply_default_perms(fsp, pace, S_IROTH);
1117 if ((pace = SMB_MALLOC_P(canon_ace)) == NULL) {
1118 DEBUG(0,("ensure_canon_entry_valid: malloc fail.\n"));
1123 pace->type = SMB_ACL_USER_OBJ;
1124 pace->owner_type = UID_ACE;
1125 pace->unix_ug.uid = pst->st_uid;
1126 pace->trustee = *pfile_owner_sid;
1127 pace->attr = ALLOW_ACE;
1130 /* See if the owning user is in any of the other groups in
1131 the ACE. If so, OR in the permissions from that group. */
1133 BOOL group_matched = False;
1134 canon_ace *pace_iter;
1136 for (pace_iter = *pp_ace; pace_iter; pace_iter = pace_iter->next) {
1137 if (pace_iter->type == SMB_ACL_GROUP_OBJ || pace_iter->type == SMB_ACL_GROUP) {
1138 if (uid_entry_in_group(pace, pace_iter)) {
1139 pace->perms |= pace_iter->perms;
1140 group_matched = True;
1145 /* If we only got an "everyone" perm, just use that. */
1146 if (!group_matched) {
1148 pace->perms = pace_other->perms;
1153 apply_default_perms(fsp, pace, S_IRUSR);
1155 pace->perms = unix_perms_to_acl_perms(pst->st_mode, S_IRUSR, S_IWUSR, S_IXUSR);
1158 DLIST_ADD(*pp_ace, pace);
1162 if ((pace = SMB_MALLOC_P(canon_ace)) == NULL) {
1163 DEBUG(0,("ensure_canon_entry_valid: malloc fail.\n"));
1168 pace->type = SMB_ACL_GROUP_OBJ;
1169 pace->owner_type = GID_ACE;
1170 pace->unix_ug.uid = pst->st_gid;
1171 pace->trustee = *pfile_grp_sid;
1172 pace->attr = ALLOW_ACE;
1174 /* If we only got an "everyone" perm, just use that. */
1176 pace->perms = pace_other->perms;
1179 apply_default_perms(fsp, pace, S_IRGRP);
1181 pace->perms = unix_perms_to_acl_perms(pst->st_mode, S_IRGRP, S_IWGRP, S_IXGRP);
1184 DLIST_ADD(*pp_ace, pace);
1188 if ((pace = SMB_MALLOC_P(canon_ace)) == NULL) {
1189 DEBUG(0,("ensure_canon_entry_valid: malloc fail.\n"));
1194 pace->type = SMB_ACL_OTHER;
1195 pace->owner_type = WORLD_ACE;
1196 pace->unix_ug.world = -1;
1197 pace->trustee = global_sid_World;
1198 pace->attr = ALLOW_ACE;
1201 apply_default_perms(fsp, pace, S_IROTH);
1203 pace->perms = unix_perms_to_acl_perms(pst->st_mode, S_IROTH, S_IWOTH, S_IXOTH);
1205 DLIST_ADD(*pp_ace, pace);
1211 /****************************************************************************
1212 Check if a POSIX ACL has the required SMB_ACL_USER_OBJ and SMB_ACL_GROUP_OBJ entries.
1213 If it does not have them, check if there are any entries where the trustee is the
1214 file owner or the owning group, and map these to SMB_ACL_USER_OBJ and SMB_ACL_GROUP_OBJ.
1215 ****************************************************************************/
1217 static void check_owning_objs(canon_ace *ace, DOM_SID *pfile_owner_sid, DOM_SID *pfile_grp_sid)
1219 BOOL got_user_obj, got_group_obj;
1220 canon_ace *current_ace;
1223 entries = count_canon_ace_list(ace);
1224 got_user_obj = False;
1225 got_group_obj = False;
1227 for (i=0, current_ace = ace; i < entries; i++, current_ace = current_ace->next) {
1228 if (current_ace->type == SMB_ACL_USER_OBJ)
1229 got_user_obj = True;
1230 else if (current_ace->type == SMB_ACL_GROUP_OBJ)
1231 got_group_obj = True;
1233 if (got_user_obj && got_group_obj) {
1234 DEBUG(10,("check_owning_objs: ACL had owning user/group entries.\n"));
1238 for (i=0, current_ace = ace; i < entries; i++, current_ace = current_ace->next) {
1239 if (!got_user_obj && current_ace->owner_type == UID_ACE &&
1240 sid_equal(¤t_ace->trustee, pfile_owner_sid)) {
1241 current_ace->type = SMB_ACL_USER_OBJ;
1242 got_user_obj = True;
1244 if (!got_group_obj && current_ace->owner_type == GID_ACE &&
1245 sid_equal(¤t_ace->trustee, pfile_grp_sid)) {
1246 current_ace->type = SMB_ACL_GROUP_OBJ;
1247 got_group_obj = True;
1251 DEBUG(10,("check_owning_objs: ACL is missing an owner entry.\n"));
1253 DEBUG(10,("check_owning_objs: ACL is missing an owning group entry.\n"));
1256 /****************************************************************************
1257 Unpack a SEC_DESC into two canonical ace lists.
1258 ****************************************************************************/
1260 static BOOL create_canon_ace_lists(files_struct *fsp, SMB_STRUCT_STAT *pst,
1261 DOM_SID *pfile_owner_sid,
1262 DOM_SID *pfile_grp_sid,
1263 canon_ace **ppfile_ace, canon_ace **ppdir_ace,
1266 BOOL all_aces_are_inherit_only = (fsp->is_directory ? True : False);
1267 canon_ace *file_ace = NULL;
1268 canon_ace *dir_ace = NULL;
1269 canon_ace *current_ace = NULL;
1270 BOOL got_dir_allow = False;
1271 BOOL got_file_allow = False;
1278 * Convert the incoming ACL into a more regular form.
1281 for(i = 0; i < dacl->num_aces; i++) {
1282 SEC_ACE *psa = &dacl->aces[i];
1284 if((psa->type != SEC_ACE_TYPE_ACCESS_ALLOWED) && (psa->type != SEC_ACE_TYPE_ACCESS_DENIED)) {
1285 DEBUG(3,("create_canon_ace_lists: unable to set anything but an ALLOW or DENY ACE.\n"));
1289 if (nt4_compatible_acls()) {
1291 * The security mask may be UNIX_ACCESS_NONE which should map into
1292 * no permissions (we overload the WRITE_OWNER bit for this) or it
1293 * should be one of the ALL/EXECUTE/READ/WRITE bits. Arrange for this
1294 * to be so. Any other bits override the UNIX_ACCESS_NONE bit.
1298 * Convert GENERIC bits to specific bits.
1301 se_map_generic(&psa->access_mask, &file_generic_mapping);
1303 psa->access_mask &= (UNIX_ACCESS_NONE|FILE_ALL_ACCESS);
1305 if(psa->access_mask != UNIX_ACCESS_NONE)
1306 psa->access_mask &= ~UNIX_ACCESS_NONE;
1311 * Deal with the fact that NT 4.x re-writes the canonical format
1312 * that we return for default ACLs. If a directory ACE is identical
1313 * to a inherited directory ACE then NT changes the bits so that the
1314 * first ACE is set to OI|IO and the second ACE for this SID is set
1315 * to CI. We need to repair this. JRA.
1318 for(i = 0; i < dacl->num_aces; i++) {
1319 SEC_ACE *psa1 = &dacl->aces[i];
1321 for (j = i + 1; j < dacl->num_aces; j++) {
1322 SEC_ACE *psa2 = &dacl->aces[j];
1324 if (psa1->access_mask != psa2->access_mask)
1327 if (!sid_equal(&psa1->trustee, &psa2->trustee))
1331 * Ok - permission bits and SIDs are equal.
1332 * Check if flags were re-written.
1335 if (psa1->flags & SEC_ACE_FLAG_INHERIT_ONLY) {
1337 psa1->flags |= (psa2->flags & (SEC_ACE_FLAG_CONTAINER_INHERIT|SEC_ACE_FLAG_OBJECT_INHERIT));
1338 psa2->flags &= ~(SEC_ACE_FLAG_CONTAINER_INHERIT|SEC_ACE_FLAG_OBJECT_INHERIT);
1340 } else if (psa2->flags & SEC_ACE_FLAG_INHERIT_ONLY) {
1342 psa2->flags |= (psa1->flags & (SEC_ACE_FLAG_CONTAINER_INHERIT|SEC_ACE_FLAG_OBJECT_INHERIT));
1343 psa1->flags &= ~(SEC_ACE_FLAG_CONTAINER_INHERIT|SEC_ACE_FLAG_OBJECT_INHERIT);
1349 for(i = 0; i < dacl->num_aces; i++) {
1350 SEC_ACE *psa = &dacl->aces[i];
1353 * Create a cannon_ace entry representing this NT DACL ACE.
1356 if ((current_ace = SMB_MALLOC_P(canon_ace)) == NULL) {
1357 free_canon_ace_list(file_ace);
1358 free_canon_ace_list(dir_ace);
1359 DEBUG(0,("create_canon_ace_lists: malloc fail.\n"));
1363 ZERO_STRUCTP(current_ace);
1365 sid_copy(¤t_ace->trustee, &psa->trustee);
1368 * Try and work out if the SID is a user or group
1369 * as we need to flag these differently for POSIX.
1370 * Note what kind of a POSIX ACL this should map to.
1373 if( sid_equal(¤t_ace->trustee, &global_sid_World)) {
1374 current_ace->owner_type = WORLD_ACE;
1375 current_ace->unix_ug.world = -1;
1376 current_ace->type = SMB_ACL_OTHER;
1377 } else if (sid_equal(¤t_ace->trustee, &global_sid_Creator_Owner)) {
1378 current_ace->owner_type = UID_ACE;
1379 current_ace->unix_ug.uid = pst->st_uid;
1380 current_ace->type = SMB_ACL_USER_OBJ;
1383 * The Creator Owner entry only specifies inheritable permissions,
1384 * never access permissions. WinNT doesn't always set the ACE to
1385 *INHERIT_ONLY, though.
1388 if (nt4_compatible_acls())
1389 psa->flags |= SEC_ACE_FLAG_INHERIT_ONLY;
1390 } else if (sid_equal(¤t_ace->trustee, &global_sid_Creator_Group)) {
1391 current_ace->owner_type = GID_ACE;
1392 current_ace->unix_ug.gid = pst->st_gid;
1393 current_ace->type = SMB_ACL_GROUP_OBJ;
1396 * The Creator Group entry only specifies inheritable permissions,
1397 * never access permissions. WinNT doesn't always set the ACE to
1398 *INHERIT_ONLY, though.
1400 if (nt4_compatible_acls())
1401 psa->flags |= SEC_ACE_FLAG_INHERIT_ONLY;
1403 } else if (sid_to_uid( ¤t_ace->trustee, ¤t_ace->unix_ug.uid)) {
1404 current_ace->owner_type = UID_ACE;
1405 /* If it's the owning user, this is a user_obj, not
1407 if (current_ace->unix_ug.uid == pst->st_uid) {
1408 current_ace->type = SMB_ACL_USER_OBJ;
1410 current_ace->type = SMB_ACL_USER;
1412 } else if (sid_to_gid( ¤t_ace->trustee, ¤t_ace->unix_ug.gid)) {
1413 current_ace->owner_type = GID_ACE;
1414 /* If it's the primary group, this is a group_obj, not
1416 if (current_ace->unix_ug.gid == pst->st_gid) {
1417 current_ace->type = SMB_ACL_GROUP_OBJ;
1419 current_ace->type = SMB_ACL_GROUP;
1425 * Silently ignore map failures in non-mappable SIDs (NT Authority, BUILTIN etc).
1428 if (non_mappable_sid(&psa->trustee)) {
1429 DEBUG(10,("create_canon_ace_lists: ignoring non-mappable SID %s\n",
1430 sid_to_string(str, &psa->trustee) ));
1431 SAFE_FREE(current_ace);
1435 free_canon_ace_list(file_ace);
1436 free_canon_ace_list(dir_ace);
1437 DEBUG(0,("create_canon_ace_lists: unable to map SID %s to uid or gid.\n",
1438 sid_to_string(str, ¤t_ace->trustee) ));
1439 SAFE_FREE(current_ace);
1444 * Map the given NT permissions into a UNIX mode_t containing only
1445 * S_I(R|W|X)USR bits.
1448 current_ace->perms |= map_nt_perms( &psa->access_mask, S_IRUSR);
1449 current_ace->attr = (psa->type == SEC_ACE_TYPE_ACCESS_ALLOWED) ? ALLOW_ACE : DENY_ACE;
1450 current_ace->inherited = ((psa->flags & SEC_ACE_FLAG_INHERITED_ACE) ? True : False);
1453 * Now add the created ace to either the file list, the directory
1454 * list, or both. We *MUST* preserve the order here (hence we use
1455 * DLIST_ADD_END) as NT ACLs are order dependent.
1458 if (fsp->is_directory) {
1461 * We can only add to the default POSIX ACE list if the ACE is
1462 * designed to be inherited by both files and directories.
1465 if ((psa->flags & (SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT)) ==
1466 (SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT)) {
1468 DLIST_ADD_END(dir_ace, current_ace, canon_ace *);
1471 * Note if this was an allow ace. We can't process
1472 * any further deny ace's after this.
1475 if (current_ace->attr == ALLOW_ACE)
1476 got_dir_allow = True;
1478 if ((current_ace->attr == DENY_ACE) && got_dir_allow) {
1479 DEBUG(0,("create_canon_ace_lists: malformed ACL in inheritable ACL ! \
1480 Deny entry after Allow entry. Failing to set on file %s.\n", fsp->fsp_name ));
1481 free_canon_ace_list(file_ace);
1482 free_canon_ace_list(dir_ace);
1486 if( DEBUGLVL( 10 )) {
1487 dbgtext("create_canon_ace_lists: adding dir ACL:\n");
1488 print_canon_ace( current_ace, 0);
1492 * If this is not an inherit only ACE we need to add a duplicate
1496 if (!(psa->flags & SEC_ACE_FLAG_INHERIT_ONLY)) {
1497 canon_ace *dup_ace = dup_canon_ace(current_ace);
1500 DEBUG(0,("create_canon_ace_lists: malloc fail !\n"));
1501 free_canon_ace_list(file_ace);
1502 free_canon_ace_list(dir_ace);
1507 * We must not free current_ace here as its
1508 * pointer is now owned by the dir_ace list.
1510 current_ace = dup_ace;
1513 * We must not free current_ace here as its
1514 * pointer is now owned by the dir_ace list.
1522 * Only add to the file ACL if not inherit only.
1525 if (current_ace && !(psa->flags & SEC_ACE_FLAG_INHERIT_ONLY)) {
1526 DLIST_ADD_END(file_ace, current_ace, canon_ace *);
1529 * Note if this was an allow ace. We can't process
1530 * any further deny ace's after this.
1533 if (current_ace->attr == ALLOW_ACE)
1534 got_file_allow = True;
1536 if ((current_ace->attr == DENY_ACE) && got_file_allow) {
1537 DEBUG(0,("create_canon_ace_lists: malformed ACL in file ACL ! \
1538 Deny entry after Allow entry. Failing to set on file %s.\n", fsp->fsp_name ));
1539 free_canon_ace_list(file_ace);
1540 free_canon_ace_list(dir_ace);
1544 if( DEBUGLVL( 10 )) {
1545 dbgtext("create_canon_ace_lists: adding file ACL:\n");
1546 print_canon_ace( current_ace, 0);
1548 all_aces_are_inherit_only = False;
1550 * We must not free current_ace here as its
1551 * pointer is now owned by the file_ace list.
1557 * Free if ACE was not added.
1560 SAFE_FREE(current_ace);
1563 if (fsp->is_directory && all_aces_are_inherit_only) {
1565 * Windows 2000 is doing one of these weird 'inherit acl'
1566 * traverses to conserve NTFS ACL resources. Just pretend
1567 * there was no DACL sent. JRA.
1570 DEBUG(10,("create_canon_ace_lists: Win2k inherit acl traverse. Ignoring DACL.\n"));
1571 free_canon_ace_list(file_ace);
1572 free_canon_ace_list(dir_ace);
1577 * Check if we have SMB_ACL_USER_OBJ and SMB_ACL_GROUP_OBJ entries in each
1578 * ACL. If we don't have them, check if any SMB_ACL_USER/SMB_ACL_GROUP
1579 * entries can be converted to *_OBJ. Usually we will already have these
1580 * entries in the Default ACL, and the Access ACL will not have them.
1583 check_owning_objs(file_ace, pfile_owner_sid, pfile_grp_sid);
1586 check_owning_objs(dir_ace, pfile_owner_sid, pfile_grp_sid);
1590 *ppfile_ace = file_ace;
1591 *ppdir_ace = dir_ace;
1596 /****************************************************************************
1597 ASCII art time again... JRA :-).
1599 We have 4 cases to process when moving from an NT ACL to a POSIX ACL. Firstly,
1600 we insist the ACL is in canonical form (ie. all DENY entries preceede ALLOW
1601 entries). Secondly, the merge code has ensured that all duplicate SID entries for
1602 allow or deny have been merged, so the same SID can only appear once in the deny
1603 list or once in the allow list.
1605 We then process as follows :
1607 ---------------------------------------------------------------------------
1608 First pass - look for a Everyone DENY entry.
1610 If it is deny all (rwx) trunate the list at this point.
1611 Else, walk the list from this point and use the deny permissions of this
1612 entry as a mask on all following allow entries. Finally, delete
1613 the Everyone DENY entry (we have applied it to everything possible).
1615 In addition, in this pass we remove any DENY entries that have
1616 no permissions (ie. they are a DENY nothing).
1617 ---------------------------------------------------------------------------
1618 Second pass - only deal with deny user entries.
1620 DENY user1 (perms XXX)
1623 for all following allow group entries where user1 is in group
1624 new_perms |= group_perms;
1626 user1 entry perms = new_perms & ~ XXX;
1628 Convert the deny entry to an allow entry with the new perms and
1629 push to the end of the list. Note if the user was in no groups
1630 this maps to a specific allow nothing entry for this user.
1632 The common case from the NT ACL choser (userX deny all) is
1633 optimised so we don't do the group lookup - we just map to
1634 an allow nothing entry.
1636 What we're doing here is inferring the allow permissions the
1637 person setting the ACE on user1 wanted by looking at the allow
1638 permissions on the groups the user is currently in. This will
1639 be a snapshot, depending on group membership but is the best
1640 we can do and has the advantage of failing closed rather than
1642 ---------------------------------------------------------------------------
1643 Third pass - only deal with deny group entries.
1645 DENY group1 (perms XXX)
1647 for all following allow user entries where user is in group1
1648 user entry perms = user entry perms & ~ XXX;
1650 If there is a group Everyone allow entry with permissions YYY,
1651 convert the group1 entry to an allow entry and modify its
1654 new_perms = YYY & ~ XXX
1656 and push to the end of the list.
1658 If there is no group Everyone allow entry then convert the
1659 group1 entry to a allow nothing entry and push to the end of the list.
1661 Note that the common case from the NT ACL choser (groupX deny all)
1662 cannot be optimised here as we need to modify user entries who are
1663 in the group to change them to a deny all also.
1665 What we're doing here is modifying the allow permissions of
1666 user entries (which are more specific in POSIX ACLs) to mask
1667 out the explicit deny set on the group they are in. This will
1668 be a snapshot depending on current group membership but is the
1669 best we can do and has the advantage of failing closed rather
1671 ---------------------------------------------------------------------------
1672 Fourth pass - cope with cumulative permissions.
1674 for all allow user entries, if there exists an allow group entry with
1675 more permissive permissions, and the user is in that group, rewrite the
1676 allow user permissions to contain both sets of permissions.
1678 Currently the code for this is #ifdef'ed out as these semantics make
1679 no sense to me. JRA.
1680 ---------------------------------------------------------------------------
1682 Note we *MUST* do the deny user pass first as this will convert deny user
1683 entries into allow user entries which can then be processed by the deny
1686 The above algorithm took a *lot* of thinking about - hence this
1687 explaination :-). JRA.
1688 ****************************************************************************/
1690 /****************************************************************************
1691 Process a canon_ace list entries. This is very complex code. We need
1692 to go through and remove the "deny" permissions from any allow entry that matches
1693 the id of this entry. We have already refused any NT ACL that wasn't in correct
1694 order (DENY followed by ALLOW). If any allow entry ends up with zero permissions,
1695 we just remove it (to fail safe). We have already removed any duplicate ace
1696 entries. Treat an "Everyone" DENY_ACE as a special case - use it to mask all
1698 ****************************************************************************/
1700 static void process_deny_list( canon_ace **pp_ace_list )
1702 canon_ace *ace_list = *pp_ace_list;
1703 canon_ace *curr_ace = NULL;
1704 canon_ace *curr_ace_next = NULL;
1706 /* Pass 1 above - look for an Everyone, deny entry. */
1708 for (curr_ace = ace_list; curr_ace; curr_ace = curr_ace_next) {
1709 canon_ace *allow_ace_p;
1711 curr_ace_next = curr_ace->next; /* So we can't lose the link. */
1713 if (curr_ace->attr != DENY_ACE)
1716 if (curr_ace->perms == (mode_t)0) {
1718 /* Deny nothing entry - delete. */
1720 DLIST_REMOVE(ace_list, curr_ace);
1724 if (!sid_equal(&curr_ace->trustee, &global_sid_World))
1727 /* JRATEST - assert. */
1728 SMB_ASSERT(curr_ace->owner_type == WORLD_ACE);
1730 if (curr_ace->perms == ALL_ACE_PERMS) {
1733 * Optimisation. This is a DENY_ALL to Everyone. Truncate the
1734 * list at this point including this entry.
1737 canon_ace *prev_entry = curr_ace->prev;
1739 free_canon_ace_list( curr_ace );
1741 prev_entry->next = NULL;
1743 /* We deleted the entire list. */
1749 for (allow_ace_p = curr_ace->next; allow_ace_p; allow_ace_p = allow_ace_p->next) {
1752 * Only mask off allow entries.
1755 if (allow_ace_p->attr != ALLOW_ACE)
1758 allow_ace_p->perms &= ~curr_ace->perms;
1762 * Now it's been applied, remove it.
1765 DLIST_REMOVE(ace_list, curr_ace);
1768 /* Pass 2 above - deal with deny user entries. */
1770 for (curr_ace = ace_list; curr_ace; curr_ace = curr_ace_next) {
1771 mode_t new_perms = (mode_t)0;
1772 canon_ace *allow_ace_p;
1774 curr_ace_next = curr_ace->next; /* So we can't lose the link. */
1776 if (curr_ace->attr != DENY_ACE)
1779 if (curr_ace->owner_type != UID_ACE)
1782 if (curr_ace->perms == ALL_ACE_PERMS) {
1785 * Optimisation - this is a deny everything to this user.
1786 * Convert to an allow nothing and push to the end of the list.
1789 curr_ace->attr = ALLOW_ACE;
1790 curr_ace->perms = (mode_t)0;
1791 DLIST_DEMOTE(ace_list, curr_ace, canon_ace *);
1795 for (allow_ace_p = curr_ace->next; allow_ace_p; allow_ace_p = allow_ace_p->next) {
1797 if (allow_ace_p->attr != ALLOW_ACE)
1800 /* We process GID_ACE and WORLD_ACE entries only. */
1802 if (allow_ace_p->owner_type == UID_ACE)
1805 if (uid_entry_in_group( curr_ace, allow_ace_p))
1806 new_perms |= allow_ace_p->perms;
1810 * Convert to a allow entry, modify the perms and push to the end
1814 curr_ace->attr = ALLOW_ACE;
1815 curr_ace->perms = (new_perms & ~curr_ace->perms);
1816 DLIST_DEMOTE(ace_list, curr_ace, canon_ace *);
1819 /* Pass 3 above - deal with deny group entries. */
1821 for (curr_ace = ace_list; curr_ace; curr_ace = curr_ace_next) {
1822 canon_ace *allow_ace_p;
1823 canon_ace *allow_everyone_p = NULL;
1825 curr_ace_next = curr_ace->next; /* So we can't lose the link. */
1827 if (curr_ace->attr != DENY_ACE)
1830 if (curr_ace->owner_type != GID_ACE)
1833 for (allow_ace_p = curr_ace->next; allow_ace_p; allow_ace_p = allow_ace_p->next) {
1835 if (allow_ace_p->attr != ALLOW_ACE)
1838 /* Store a pointer to the Everyone allow, if it exists. */
1839 if (allow_ace_p->owner_type == WORLD_ACE)
1840 allow_everyone_p = allow_ace_p;
1842 /* We process UID_ACE entries only. */
1844 if (allow_ace_p->owner_type != UID_ACE)
1847 /* Mask off the deny group perms. */
1849 if (uid_entry_in_group( allow_ace_p, curr_ace))
1850 allow_ace_p->perms &= ~curr_ace->perms;
1854 * Convert the deny to an allow with the correct perms and
1855 * push to the end of the list.
1858 curr_ace->attr = ALLOW_ACE;
1859 if (allow_everyone_p)
1860 curr_ace->perms = allow_everyone_p->perms & ~curr_ace->perms;
1862 curr_ace->perms = (mode_t)0;
1863 DLIST_DEMOTE(ace_list, curr_ace, canon_ace *);
1866 /* Doing this fourth pass allows Windows semantics to be layered
1867 * on top of POSIX semantics. I'm not sure if this is desirable.
1868 * For example, in W2K ACLs there is no way to say, "Group X no
1869 * access, user Y full access" if user Y is a member of group X.
1870 * This seems completely broken semantics to me.... JRA.
1874 /* Pass 4 above - deal with allow entries. */
1876 for (curr_ace = ace_list; curr_ace; curr_ace = curr_ace_next) {
1877 canon_ace *allow_ace_p;
1879 curr_ace_next = curr_ace->next; /* So we can't lose the link. */
1881 if (curr_ace->attr != ALLOW_ACE)
1884 if (curr_ace->owner_type != UID_ACE)
1887 for (allow_ace_p = ace_list; allow_ace_p; allow_ace_p = allow_ace_p->next) {
1889 if (allow_ace_p->attr != ALLOW_ACE)
1892 /* We process GID_ACE entries only. */
1894 if (allow_ace_p->owner_type != GID_ACE)
1897 /* OR in the group perms. */
1899 if (uid_entry_in_group( curr_ace, allow_ace_p))
1900 curr_ace->perms |= allow_ace_p->perms;
1905 *pp_ace_list = ace_list;
1908 /****************************************************************************
1909 Create a default mode that will be used if a security descriptor entry has
1910 no user/group/world entries.
1911 ****************************************************************************/
1913 static mode_t create_default_mode(files_struct *fsp, BOOL interitable_mode)
1915 int snum = SNUM(fsp->conn);
1916 mode_t and_bits = (mode_t)0;
1917 mode_t or_bits = (mode_t)0;
1918 mode_t mode = interitable_mode
1919 ? unix_mode( fsp->conn, FILE_ATTRIBUTE_ARCHIVE, fsp->fsp_name,
1923 if (fsp->is_directory)
1924 mode |= (S_IWUSR|S_IXUSR);
1927 * Now AND with the create mode/directory mode bits then OR with the
1928 * force create mode/force directory mode bits.
1931 if (fsp->is_directory) {
1932 and_bits = lp_dir_security_mask(snum);
1933 or_bits = lp_force_dir_security_mode(snum);
1935 and_bits = lp_security_mask(snum);
1936 or_bits = lp_force_security_mode(snum);
1939 return ((mode & and_bits)|or_bits);
1942 /****************************************************************************
1943 Unpack a SEC_DESC into two canonical ace lists. We don't depend on this
1945 ****************************************************************************/
1947 static BOOL unpack_canon_ace(files_struct *fsp,
1948 SMB_STRUCT_STAT *pst,
1949 DOM_SID *pfile_owner_sid,
1950 DOM_SID *pfile_grp_sid,
1951 canon_ace **ppfile_ace, canon_ace **ppdir_ace,
1952 uint32 security_info_sent, SEC_DESC *psd)
1954 canon_ace *file_ace = NULL;
1955 canon_ace *dir_ace = NULL;
1960 if(security_info_sent == 0) {
1961 DEBUG(0,("unpack_canon_ace: no security info sent !\n"));
1966 * If no DACL then this is a chown only security descriptor.
1969 if(!(security_info_sent & DACL_SECURITY_INFORMATION) || !psd->dacl)
1973 * Now go through the DACL and create the canon_ace lists.
1976 if (!create_canon_ace_lists( fsp, pst, pfile_owner_sid, pfile_grp_sid,
1977 &file_ace, &dir_ace, psd->dacl))
1980 if ((file_ace == NULL) && (dir_ace == NULL)) {
1981 /* W2K traverse DACL set - ignore. */
1986 * Go through the canon_ace list and merge entries
1987 * belonging to identical users of identical allow or deny type.
1988 * We can do this as all deny entries come first, followed by
1989 * all allow entries (we have mandated this before accepting this acl).
1992 print_canon_ace_list( "file ace - before merge", file_ace);
1993 merge_aces( &file_ace );
1995 print_canon_ace_list( "dir ace - before merge", dir_ace);
1996 merge_aces( &dir_ace );
1999 * NT ACLs are order dependent. Go through the acl lists and
2000 * process DENY entries by masking the allow entries.
2003 print_canon_ace_list( "file ace - before deny", file_ace);
2004 process_deny_list( &file_ace);
2006 print_canon_ace_list( "dir ace - before deny", dir_ace);
2007 process_deny_list( &dir_ace);
2010 * A well formed POSIX file or default ACL has at least 3 entries, a
2011 * SMB_ACL_USER_OBJ, SMB_ACL_GROUP_OBJ, SMB_ACL_OTHER_OBJ
2012 * and optionally a mask entry. Ensure this is the case.
2015 print_canon_ace_list( "file ace - before valid", file_ace);
2018 * A default 3 element mode entry for a file should be r-- --- ---.
2019 * A default 3 element mode entry for a directory should be rwx --- ---.
2022 pst->st_mode = create_default_mode(fsp, False);
2024 if (!ensure_canon_entry_valid(&file_ace, fsp, pfile_owner_sid, pfile_grp_sid, pst, True)) {
2025 free_canon_ace_list(file_ace);
2026 free_canon_ace_list(dir_ace);
2030 print_canon_ace_list( "dir ace - before valid", dir_ace);
2033 * A default inheritable 3 element mode entry for a directory should be the
2034 * mode Samba will use to create a file within. Ensure user rwx bits are set if
2038 pst->st_mode = create_default_mode(fsp, True);
2040 if (dir_ace && !ensure_canon_entry_valid(&dir_ace, fsp, pfile_owner_sid, pfile_grp_sid, pst, True)) {
2041 free_canon_ace_list(file_ace);
2042 free_canon_ace_list(dir_ace);
2046 print_canon_ace_list( "file ace - return", file_ace);
2047 print_canon_ace_list( "dir ace - return", dir_ace);
2049 *ppfile_ace = file_ace;
2050 *ppdir_ace = dir_ace;
2055 /******************************************************************************
2056 When returning permissions, try and fit NT display
2057 semantics if possible. Note the the canon_entries here must have been malloced.
2058 The list format should be - first entry = owner, followed by group and other user
2059 entries, last entry = other.
2061 Note that this doesn't exactly match the NT semantics for an ACL. As POSIX entries
2062 are not ordered, and match on the most specific entry rather than walking a list,
2063 then a simple POSIX permission of rw-r--r-- should really map to 5 entries,
2065 Entry 0: owner : deny all except read and write.
2066 Entry 1: owner : allow read and write.
2067 Entry 2: group : deny all except read.
2068 Entry 3: group : allow read.
2069 Entry 4: Everyone : allow read.
2071 But NT cannot display this in their ACL editor !
2072 ********************************************************************************/
2074 static void arrange_posix_perms( char *filename, canon_ace **pp_list_head)
2076 canon_ace *list_head = *pp_list_head;
2077 canon_ace *owner_ace = NULL;
2078 canon_ace *other_ace = NULL;
2079 canon_ace *ace = NULL;
2081 for (ace = list_head; ace; ace = ace->next) {
2082 if (ace->type == SMB_ACL_USER_OBJ)
2084 else if (ace->type == SMB_ACL_OTHER) {
2085 /* Last ace - this is "other" */
2090 if (!owner_ace || !other_ace) {
2091 DEBUG(0,("arrange_posix_perms: Invalid POSIX permissions for file %s, missing owner or other.\n",
2097 * The POSIX algorithm applies to owner first, and other last,
2098 * so ensure they are arranged in this order.
2102 DLIST_PROMOTE(list_head, owner_ace);
2106 DLIST_DEMOTE(list_head, other_ace, canon_ace *);
2109 /* We have probably changed the head of the list. */
2111 *pp_list_head = list_head;
2114 /****************************************************************************
2115 Create a linked list of canonical ACE entries.
2116 ****************************************************************************/
2118 static canon_ace *canonicalise_acl( files_struct *fsp, SMB_ACL_T posix_acl, SMB_STRUCT_STAT *psbuf,
2119 const DOM_SID *powner, const DOM_SID *pgroup, struct pai_val *pal, SMB_ACL_TYPE_T the_acl_type)
2121 connection_struct *conn = fsp->conn;
2122 mode_t acl_mask = (S_IRUSR|S_IWUSR|S_IXUSR);
2123 canon_ace *list_head = NULL;
2124 canon_ace *ace = NULL;
2125 canon_ace *next_ace = NULL;
2126 int entry_id = SMB_ACL_FIRST_ENTRY;
2127 SMB_ACL_ENTRY_T entry;
2130 while ( posix_acl && (SMB_VFS_SYS_ACL_GET_ENTRY(conn, posix_acl, entry_id, &entry) == 1)) {
2131 SMB_ACL_TAG_T tagtype;
2132 SMB_ACL_PERMSET_T permset;
2135 enum ace_owner owner_type;
2138 if (entry_id == SMB_ACL_FIRST_ENTRY)
2139 entry_id = SMB_ACL_NEXT_ENTRY;
2141 /* Is this a MASK entry ? */
2142 if (SMB_VFS_SYS_ACL_GET_TAG_TYPE(conn, entry, &tagtype) == -1)
2145 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, entry, &permset) == -1)
2148 /* Decide which SID to use based on the ACL type. */
2150 case SMB_ACL_USER_OBJ:
2151 /* Get the SID from the owner. */
2152 sid_copy(&sid, powner);
2153 unix_ug.uid = psbuf->st_uid;
2154 owner_type = UID_ACE;
2158 uid_t *puid = (uid_t *)SMB_VFS_SYS_ACL_GET_QUALIFIER(conn, entry);
2160 DEBUG(0,("canonicalise_acl: Failed to get uid.\n"));
2164 * A SMB_ACL_USER entry for the owner is shadowed by the
2165 * SMB_ACL_USER_OBJ entry and Windows also cannot represent
2166 * that entry, so we ignore it. We also don't create such
2167 * entries out of the blue when setting ACLs, so a get/set
2168 * cycle will drop them.
2170 if (the_acl_type == SMB_ACL_TYPE_ACCESS && *puid == psbuf->st_uid) {
2171 SMB_VFS_SYS_ACL_FREE_QUALIFIER(conn, (void *)puid,tagtype);
2174 uid_to_sid( &sid, *puid);
2175 unix_ug.uid = *puid;
2176 owner_type = UID_ACE;
2177 SMB_VFS_SYS_ACL_FREE_QUALIFIER(conn, (void *)puid,tagtype);
2180 case SMB_ACL_GROUP_OBJ:
2181 /* Get the SID from the owning group. */
2182 sid_copy(&sid, pgroup);
2183 unix_ug.gid = psbuf->st_gid;
2184 owner_type = GID_ACE;
2188 gid_t *pgid = (gid_t *)SMB_VFS_SYS_ACL_GET_QUALIFIER(conn, entry);
2190 DEBUG(0,("canonicalise_acl: Failed to get gid.\n"));
2193 gid_to_sid( &sid, *pgid);
2194 unix_ug.gid = *pgid;
2195 owner_type = GID_ACE;
2196 SMB_VFS_SYS_ACL_FREE_QUALIFIER(conn, (void *)pgid,tagtype);
2200 acl_mask = convert_permset_to_mode_t(conn, permset);
2201 continue; /* Don't count the mask as an entry. */
2203 /* Use the Everyone SID */
2204 sid = global_sid_World;
2206 owner_type = WORLD_ACE;
2209 DEBUG(0,("canonicalise_acl: Unknown tagtype %u\n", (unsigned int)tagtype));
2214 * Add this entry to the list.
2217 if ((ace = SMB_MALLOC_P(canon_ace)) == NULL)
2221 ace->type = tagtype;
2222 ace->perms = convert_permset_to_mode_t(conn, permset);
2223 ace->attr = ALLOW_ACE;
2225 ace->unix_ug = unix_ug;
2226 ace->owner_type = owner_type;
2227 ace->inherited = get_inherited_flag(pal, ace, (the_acl_type == SMB_ACL_TYPE_DEFAULT));
2229 DLIST_ADD(list_head, ace);
2233 * This next call will ensure we have at least a user/group/world set.
2236 if (!ensure_canon_entry_valid(&list_head, fsp, powner, pgroup, psbuf, False))
2240 * Now go through the list, masking the permissions with the
2241 * acl_mask. Ensure all DENY Entries are at the start of the list.
2244 DEBUG(10,("canonicalise_acl: %s ace entries before arrange :\n", the_acl_type == SMB_ACL_TYPE_ACCESS ? "Access" : "Default" ));
2246 for ( ace_count = 0, ace = list_head; ace; ace = next_ace, ace_count++) {
2247 next_ace = ace->next;
2249 /* Masks are only applied to entries other than USER_OBJ and OTHER. */
2250 if (ace->type != SMB_ACL_OTHER && ace->type != SMB_ACL_USER_OBJ)
2251 ace->perms &= acl_mask;
2253 if (ace->perms == 0) {
2254 DLIST_PROMOTE(list_head, ace);
2257 if( DEBUGLVL( 10 ) ) {
2258 print_canon_ace(ace, ace_count);
2262 arrange_posix_perms(fsp->fsp_name,&list_head );
2264 print_canon_ace_list( "canonicalise_acl: ace entries after arrange", list_head );
2270 free_canon_ace_list(list_head);
2274 /****************************************************************************
2275 Check if the current user group list contains a given group.
2276 ****************************************************************************/
2278 static BOOL current_user_in_group(gid_t gid)
2282 for (i = 0; i < current_user.ut.ngroups; i++) {
2283 if (current_user.ut.groups[i] == gid) {
2291 /****************************************************************************
2292 Should we override a deny ? Check 'acl group control' and 'dos filemode'
2293 ****************************************************************************/
2295 static BOOL acl_group_override(connection_struct *conn, gid_t prim_gid, const char *fname)
2297 SMB_STRUCT_STAT sbuf;
2301 if ((errno != EPERM) && (errno != EACCES)) {
2305 /* file primary group == user primary or supplementary group */
2306 if (lp_acl_group_control(SNUM(conn)) && current_user_in_group(prim_gid)) {
2310 /* user has writeable permission */
2311 if (lp_dos_filemode(SNUM(conn)) && can_write_to_file(conn, fname, &sbuf)) {
2318 /****************************************************************************
2319 Attempt to apply an ACL to a file or directory.
2320 ****************************************************************************/
2322 static BOOL set_canon_ace_list(files_struct *fsp, canon_ace *the_ace, BOOL default_ace, gid_t prim_gid, BOOL *pacl_set_support)
2324 connection_struct *conn = fsp->conn;
2326 SMB_ACL_T the_acl = SMB_VFS_SYS_ACL_INIT(conn, (int)count_canon_ace_list(the_ace) + 1);
2329 SMB_ACL_ENTRY_T mask_entry;
2330 BOOL got_mask_entry = False;
2331 SMB_ACL_PERMSET_T mask_permset;
2332 SMB_ACL_TYPE_T the_acl_type = (default_ace ? SMB_ACL_TYPE_DEFAULT : SMB_ACL_TYPE_ACCESS);
2333 BOOL needs_mask = False;
2334 mode_t mask_perms = 0;
2336 #if defined(POSIX_ACL_NEEDS_MASK)
2337 /* HP-UX always wants to have a mask (called "class" there). */
2341 if (the_acl == NULL) {
2343 if (!no_acl_syscall_error(errno)) {
2345 * Only print this error message if we have some kind of ACL
2346 * support that's not working. Otherwise we would always get this.
2348 DEBUG(0,("set_canon_ace_list: Unable to init %s ACL. (%s)\n",
2349 default_ace ? "default" : "file", strerror(errno) ));
2351 *pacl_set_support = False;
2355 if( DEBUGLVL( 10 )) {
2356 dbgtext("set_canon_ace_list: setting ACL:\n");
2357 for (i = 0, p_ace = the_ace; p_ace; p_ace = p_ace->next, i++ ) {
2358 print_canon_ace( p_ace, i);
2362 for (i = 0, p_ace = the_ace; p_ace; p_ace = p_ace->next, i++ ) {
2363 SMB_ACL_ENTRY_T the_entry;
2364 SMB_ACL_PERMSET_T the_permset;
2367 * ACLs only "need" an ACL_MASK entry if there are any named user or
2368 * named group entries. But if there is an ACL_MASK entry, it applies
2369 * to ACL_USER, ACL_GROUP, and ACL_GROUP_OBJ entries. Set the mask
2370 * so that it doesn't deny (i.e., mask off) any permissions.
2373 if (p_ace->type == SMB_ACL_USER || p_ace->type == SMB_ACL_GROUP) {
2375 mask_perms |= p_ace->perms;
2376 } else if (p_ace->type == SMB_ACL_GROUP_OBJ) {
2377 mask_perms |= p_ace->perms;
2381 * Get the entry for this ACE.
2384 if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &the_acl, &the_entry) == -1) {
2385 DEBUG(0,("set_canon_ace_list: Failed to create entry %d. (%s)\n",
2386 i, strerror(errno) ));
2390 if (p_ace->type == SMB_ACL_MASK) {
2391 mask_entry = the_entry;
2392 got_mask_entry = True;
2396 * Ok - we now know the ACL calls should be working, don't
2397 * allow fallback to chmod.
2400 *pacl_set_support = True;
2403 * Initialise the entry from the canon_ace.
2407 * First tell the entry what type of ACE this is.
2410 if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, the_entry, p_ace->type) == -1) {
2411 DEBUG(0,("set_canon_ace_list: Failed to set tag type on entry %d. (%s)\n",
2412 i, strerror(errno) ));
2417 * Only set the qualifier (user or group id) if the entry is a user
2421 if ((p_ace->type == SMB_ACL_USER) || (p_ace->type == SMB_ACL_GROUP)) {
2422 if (SMB_VFS_SYS_ACL_SET_QUALIFIER(conn, the_entry,(void *)&p_ace->unix_ug.uid) == -1) {
2423 DEBUG(0,("set_canon_ace_list: Failed to set qualifier on entry %d. (%s)\n",
2424 i, strerror(errno) ));
2430 * Convert the mode_t perms in the canon_ace to a POSIX permset.
2433 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, the_entry, &the_permset) == -1) {
2434 DEBUG(0,("set_canon_ace_list: Failed to get permset on entry %d. (%s)\n",
2435 i, strerror(errno) ));
2439 if (map_acl_perms_to_permset(conn, p_ace->perms, &the_permset) == -1) {
2440 DEBUG(0,("set_canon_ace_list: Failed to create permset for mode (%u) on entry %d. (%s)\n",
2441 (unsigned int)p_ace->perms, i, strerror(errno) ));
2446 * ..and apply them to the entry.
2449 if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, the_entry, the_permset) == -1) {
2450 DEBUG(0,("set_canon_ace_list: Failed to add permset on entry %d. (%s)\n",
2451 i, strerror(errno) ));
2456 print_canon_ace( p_ace, i);
2460 if (needs_mask && !got_mask_entry) {
2461 if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &the_acl, &mask_entry) == -1) {
2462 DEBUG(0,("set_canon_ace_list: Failed to create mask entry. (%s)\n", strerror(errno) ));
2466 if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, mask_entry, SMB_ACL_MASK) == -1) {
2467 DEBUG(0,("set_canon_ace_list: Failed to set tag type on mask entry. (%s)\n",strerror(errno) ));
2471 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, mask_entry, &mask_permset) == -1) {
2472 DEBUG(0,("set_canon_ace_list: Failed to get mask permset. (%s)\n", strerror(errno) ));
2476 if (map_acl_perms_to_permset(conn, S_IRUSR|S_IWUSR|S_IXUSR, &mask_permset) == -1) {
2477 DEBUG(0,("set_canon_ace_list: Failed to create mask permset. (%s)\n", strerror(errno) ));
2481 if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, mask_entry, mask_permset) == -1) {
2482 DEBUG(0,("set_canon_ace_list: Failed to add mask permset. (%s)\n", strerror(errno) ));
2488 * Finally apply it to the file or directory.
2491 if(default_ace || fsp->is_directory || fsp->fh->fd == -1) {
2492 if (SMB_VFS_SYS_ACL_SET_FILE(conn, fsp->fsp_name, the_acl_type, the_acl) == -1) {
2494 * Some systems allow all the above calls and only fail with no ACL support
2495 * when attempting to apply the acl. HPUX with HFS is an example of this. JRA.
2497 if (no_acl_syscall_error(errno)) {
2498 *pacl_set_support = False;
2501 if (acl_group_override(conn, prim_gid, fsp->fsp_name)) {
2504 DEBUG(5,("set_canon_ace_list: acl group control on and current user in file %s primary group.\n",
2508 sret = SMB_VFS_SYS_ACL_SET_FILE(conn, fsp->fsp_name, the_acl_type, the_acl);
2516 DEBUG(2,("set_canon_ace_list: sys_acl_set_file type %s failed for file %s (%s).\n",
2517 the_acl_type == SMB_ACL_TYPE_DEFAULT ? "directory default" : "file",
2518 fsp->fsp_name, strerror(errno) ));
2523 if (SMB_VFS_SYS_ACL_SET_FD(fsp, fsp->fh->fd, the_acl) == -1) {
2525 * Some systems allow all the above calls and only fail with no ACL support
2526 * when attempting to apply the acl. HPUX with HFS is an example of this. JRA.
2528 if (no_acl_syscall_error(errno)) {
2529 *pacl_set_support = False;
2532 if (acl_group_override(conn, prim_gid, fsp->fsp_name)) {
2535 DEBUG(5,("set_canon_ace_list: acl group control on and current user in file %s primary group.\n",
2539 sret = SMB_VFS_SYS_ACL_SET_FD(fsp, fsp->fh->fd, the_acl);
2547 DEBUG(2,("set_canon_ace_list: sys_acl_set_file failed for file %s (%s).\n",
2548 fsp->fsp_name, strerror(errno) ));
2558 if (the_acl != NULL) {
2559 SMB_VFS_SYS_ACL_FREE_ACL(conn, the_acl);
2565 /****************************************************************************
2566 Find a particular canon_ace entry.
2567 ****************************************************************************/
2569 static struct canon_ace *canon_ace_entry_for(struct canon_ace *list, SMB_ACL_TAG_T type, posix_id *id)
2572 if (list->type == type && ((type != SMB_ACL_USER && type != SMB_ACL_GROUP) ||
2573 (type == SMB_ACL_USER && id && id->uid == list->unix_ug.uid) ||
2574 (type == SMB_ACL_GROUP && id && id->gid == list->unix_ug.gid)))
2581 /****************************************************************************
2583 ****************************************************************************/
2585 SMB_ACL_T free_empty_sys_acl(connection_struct *conn, SMB_ACL_T the_acl)
2587 SMB_ACL_ENTRY_T entry;
2591 if (SMB_VFS_SYS_ACL_GET_ENTRY(conn, the_acl, SMB_ACL_FIRST_ENTRY, &entry) != 1) {
2592 SMB_VFS_SYS_ACL_FREE_ACL(conn, the_acl);
2598 /****************************************************************************
2599 Convert a canon_ace to a generic 3 element permission - if possible.
2600 ****************************************************************************/
2602 #define MAP_PERM(p,mask,result) (((p) & (mask)) ? (result) : 0 )
2604 static BOOL convert_canon_ace_to_posix_perms( files_struct *fsp, canon_ace *file_ace_list, mode_t *posix_perms)
2606 int snum = SNUM(fsp->conn);
2607 size_t ace_count = count_canon_ace_list(file_ace_list);
2609 canon_ace *owner_ace = NULL;
2610 canon_ace *group_ace = NULL;
2611 canon_ace *other_ace = NULL;
2615 if (ace_count != 3) {
2616 DEBUG(3,("convert_canon_ace_to_posix_perms: Too many ACE entries for file %s to convert to \
2617 posix perms.\n", fsp->fsp_name ));
2621 for (ace_p = file_ace_list; ace_p; ace_p = ace_p->next) {
2622 if (ace_p->owner_type == UID_ACE)
2624 else if (ace_p->owner_type == GID_ACE)
2626 else if (ace_p->owner_type == WORLD_ACE)
2630 if (!owner_ace || !group_ace || !other_ace) {
2631 DEBUG(3,("convert_canon_ace_to_posix_perms: Can't get standard entries for file %s.\n",
2636 *posix_perms = (mode_t)0;
2638 *posix_perms |= owner_ace->perms;
2639 *posix_perms |= MAP_PERM(group_ace->perms, S_IRUSR, S_IRGRP);
2640 *posix_perms |= MAP_PERM(group_ace->perms, S_IWUSR, S_IWGRP);
2641 *posix_perms |= MAP_PERM(group_ace->perms, S_IXUSR, S_IXGRP);
2642 *posix_perms |= MAP_PERM(other_ace->perms, S_IRUSR, S_IROTH);
2643 *posix_perms |= MAP_PERM(other_ace->perms, S_IWUSR, S_IWOTH);
2644 *posix_perms |= MAP_PERM(other_ace->perms, S_IXUSR, S_IXOTH);
2646 /* The owner must have at least read access. */
2648 *posix_perms |= S_IRUSR;
2649 if (fsp->is_directory)
2650 *posix_perms |= (S_IWUSR|S_IXUSR);
2652 /* If requested apply the masks. */
2654 /* Get the initial bits to apply. */
2656 if (fsp->is_directory) {
2657 and_bits = lp_dir_security_mask(snum);
2658 or_bits = lp_force_dir_security_mode(snum);
2660 and_bits = lp_security_mask(snum);
2661 or_bits = lp_force_security_mode(snum);
2664 *posix_perms = (((*posix_perms) & and_bits)|or_bits);
2666 DEBUG(10,("convert_canon_ace_to_posix_perms: converted u=%o,g=%o,w=%o to perm=0%o for file %s.\n",
2667 (int)owner_ace->perms, (int)group_ace->perms, (int)other_ace->perms, (int)*posix_perms,
2673 /****************************************************************************
2674 Incoming NT ACLs on a directory can be split into a default POSIX acl (CI|OI|IO) and
2675 a normal POSIX acl. Win2k needs these split acls re-merging into one ACL
2676 with CI|OI set so it is inherited and also applies to the directory.
2677 Based on code from "Jim McDonough" <jmcd@us.ibm.com>.
2678 ****************************************************************************/
2680 static size_t merge_default_aces( SEC_ACE *nt_ace_list, size_t num_aces)
2684 for (i = 0; i < num_aces; i++) {
2685 for (j = i+1; j < num_aces; j++) {
2686 uint32 i_flags_ni = (nt_ace_list[i].flags & ~SEC_ACE_FLAG_INHERITED_ACE);
2687 uint32 j_flags_ni = (nt_ace_list[j].flags & ~SEC_ACE_FLAG_INHERITED_ACE);
2688 BOOL i_inh = (nt_ace_list[i].flags & SEC_ACE_FLAG_INHERITED_ACE) ? True : False;
2689 BOOL j_inh = (nt_ace_list[j].flags & SEC_ACE_FLAG_INHERITED_ACE) ? True : False;
2691 /* We know the lower number ACE's are file entries. */
2692 if ((nt_ace_list[i].type == nt_ace_list[j].type) &&
2693 (nt_ace_list[i].size == nt_ace_list[j].size) &&
2694 (nt_ace_list[i].access_mask == nt_ace_list[j].access_mask) &&
2695 sid_equal(&nt_ace_list[i].trustee, &nt_ace_list[j].trustee) &&
2697 (i_flags_ni == 0) &&
2698 (j_flags_ni == (SEC_ACE_FLAG_OBJECT_INHERIT|
2699 SEC_ACE_FLAG_CONTAINER_INHERIT|
2700 SEC_ACE_FLAG_INHERIT_ONLY))) {
2702 * W2K wants to have access allowed zero access ACE's
2703 * at the end of the list. If the mask is zero, merge
2704 * the non-inherited ACE onto the inherited ACE.
2707 if (nt_ace_list[i].access_mask == 0) {
2708 nt_ace_list[j].flags = SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT|
2709 (i_inh ? SEC_ACE_FLAG_INHERITED_ACE : 0);
2710 if (num_aces - i - 1 > 0)
2711 memmove(&nt_ace_list[i], &nt_ace_list[i+1], (num_aces-i-1) *
2714 DEBUG(10,("merge_default_aces: Merging zero access ACE %u onto ACE %u.\n",
2715 (unsigned int)i, (unsigned int)j ));
2718 * These are identical except for the flags.
2719 * Merge the inherited ACE onto the non-inherited ACE.
2722 nt_ace_list[i].flags = SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT|
2723 (i_inh ? SEC_ACE_FLAG_INHERITED_ACE : 0);
2724 if (num_aces - j - 1 > 0)
2725 memmove(&nt_ace_list[j], &nt_ace_list[j+1], (num_aces-j-1) *
2728 DEBUG(10,("merge_default_aces: Merging ACE %u onto ACE %u.\n",
2729 (unsigned int)j, (unsigned int)i ));
2739 /****************************************************************************
2740 Reply to query a security descriptor from an fsp. If it succeeds it allocates
2741 the space for the return elements and returns the size needed to return the
2742 security descriptor. This should be the only external function needed for
2743 the UNIX style get ACL.
2744 ****************************************************************************/
2746 size_t get_nt_acl(files_struct *fsp, uint32 security_info, SEC_DESC **ppdesc)
2748 connection_struct *conn = fsp->conn;
2749 SMB_STRUCT_STAT sbuf;
2750 SEC_ACE *nt_ace_list = NULL;
2754 SEC_ACL *psa = NULL;
2755 size_t num_acls = 0;
2756 size_t num_def_acls = 0;
2757 size_t num_aces = 0;
2758 SMB_ACL_T posix_acl = NULL;
2759 SMB_ACL_T def_acl = NULL;
2760 canon_ace *file_ace = NULL;
2761 canon_ace *dir_ace = NULL;
2762 size_t num_profile_acls = 0;
2763 struct pai_val *pal = NULL;
2764 SEC_DESC *psd = NULL;
2768 DEBUG(10,("get_nt_acl: called for file %s\n", fsp->fsp_name ));
2770 if(fsp->is_directory || fsp->fh->fd == -1) {
2772 /* Get the stat struct for the owner info. */
2773 if(SMB_VFS_STAT(fsp->conn,fsp->fsp_name, &sbuf) != 0) {
2777 * Get the ACL from the path.
2780 posix_acl = SMB_VFS_SYS_ACL_GET_FILE(conn, fsp->fsp_name, SMB_ACL_TYPE_ACCESS);
2783 * If it's a directory get the default POSIX ACL.
2786 if(fsp->is_directory) {
2787 def_acl = SMB_VFS_SYS_ACL_GET_FILE(conn, fsp->fsp_name, SMB_ACL_TYPE_DEFAULT);
2788 def_acl = free_empty_sys_acl(conn, def_acl);
2793 /* Get the stat struct for the owner info. */
2794 if(SMB_VFS_FSTAT(fsp,fsp->fh->fd,&sbuf) != 0) {
2798 * Get the ACL from the fd.
2800 posix_acl = SMB_VFS_SYS_ACL_GET_FD(fsp, fsp->fh->fd);
2803 DEBUG(5,("get_nt_acl : file ACL %s, directory ACL %s\n",
2804 posix_acl ? "present" : "absent",
2805 def_acl ? "present" : "absent" ));
2807 pal = load_inherited_info(fsp);
2810 * Get the owner, group and world SIDs.
2813 if (lp_profile_acls(SNUM(conn))) {
2814 /* For WXP SP1 the owner must be administrators. */
2815 sid_copy(&owner_sid, &global_sid_Builtin_Administrators);
2816 sid_copy(&group_sid, &global_sid_Builtin_Users);
2817 num_profile_acls = 2;
2819 create_file_sids(&sbuf, &owner_sid, &group_sid);
2822 if ((security_info & DACL_SECURITY_INFORMATION) && !(security_info & PROTECTED_DACL_SECURITY_INFORMATION)) {
2825 * In the optimum case Creator Owner and Creator Group would be used for
2826 * the ACL_USER_OBJ and ACL_GROUP_OBJ entries, respectively, but this
2827 * would lead to usability problems under Windows: The Creator entries
2828 * are only available in browse lists of directories and not for files;
2829 * additionally the identity of the owning group couldn't be determined.
2830 * We therefore use those identities only for Default ACLs.
2833 /* Create the canon_ace lists. */
2834 file_ace = canonicalise_acl( fsp, posix_acl, &sbuf, &owner_sid, &group_sid, pal, SMB_ACL_TYPE_ACCESS );
2836 /* We must have *some* ACLS. */
2838 if (count_canon_ace_list(file_ace) == 0) {
2839 DEBUG(0,("get_nt_acl : No ACLs on file (%s) !\n", fsp->fsp_name ));
2843 if (fsp->is_directory && def_acl) {
2844 dir_ace = canonicalise_acl(fsp, def_acl, &sbuf,
2845 &global_sid_Creator_Owner,
2846 &global_sid_Creator_Group, pal, SMB_ACL_TYPE_DEFAULT );
2850 * Create the NT ACE list from the canonical ace lists.
2858 if (nt4_compatible_acls() && dir_ace) {
2860 * NT 4 chokes if an ACL contains an INHERIT_ONLY entry
2861 * but no non-INHERIT_ONLY entry for one SID. So we only
2862 * remove entries from the Access ACL if the
2863 * corresponding Default ACL entries have also been
2864 * removed. ACEs for CREATOR-OWNER and CREATOR-GROUP
2865 * are exceptions. We can do nothing
2866 * intelligent if the Default ACL contains entries that
2867 * are not also contained in the Access ACL, so this
2868 * case will still fail under NT 4.
2871 ace = canon_ace_entry_for(dir_ace, SMB_ACL_OTHER, NULL);
2872 if (ace && !ace->perms) {
2873 DLIST_REMOVE(dir_ace, ace);
2876 ace = canon_ace_entry_for(file_ace, SMB_ACL_OTHER, NULL);
2877 if (ace && !ace->perms) {
2878 DLIST_REMOVE(file_ace, ace);
2884 * WinNT doesn't usually have Creator Group
2885 * in browse lists, so we send this entry to
2886 * WinNT even if it contains no relevant
2887 * permissions. Once we can add
2888 * Creator Group to browse lists we can
2893 ace = canon_ace_entry_for(dir_ace, SMB_ACL_GROUP_OBJ, NULL);
2894 if (ace && !ace->perms) {
2895 DLIST_REMOVE(dir_ace, ace);
2900 ace = canon_ace_entry_for(file_ace, SMB_ACL_GROUP_OBJ, NULL);
2901 if (ace && !ace->perms) {
2902 DLIST_REMOVE(file_ace, ace);
2907 num_acls = count_canon_ace_list(file_ace);
2908 num_def_acls = count_canon_ace_list(dir_ace);
2910 /* Allocate the ace list. */
2911 if ((nt_ace_list = SMB_MALLOC_ARRAY(SEC_ACE,num_acls + num_profile_acls + num_def_acls)) == NULL) {
2912 DEBUG(0,("get_nt_acl: Unable to malloc space for nt_ace_list.\n"));
2916 memset(nt_ace_list, '\0', (num_acls + num_def_acls) * sizeof(SEC_ACE) );
2919 * Create the NT ACE list from the canonical ace lists.
2924 for (i = 0; i < num_acls; i++, ace = ace->next) {
2927 acc = map_canon_ace_perms(SNUM(conn),
2931 init_sec_ace(&nt_ace_list[num_aces++],
2936 SEC_ACE_FLAG_INHERITED_ACE : 0);
2939 /* The User must have access to a profile share - even
2940 * if we can't map the SID. */
2941 if (lp_profile_acls(SNUM(conn))) {
2944 init_sec_access(&acc,FILE_GENERIC_ALL);
2945 init_sec_ace(&nt_ace_list[num_aces++],
2946 &global_sid_Builtin_Users,
2947 SEC_ACE_TYPE_ACCESS_ALLOWED,
2953 for (i = 0; i < num_def_acls; i++, ace = ace->next) {
2956 acc = map_canon_ace_perms(SNUM(conn),
2960 init_sec_ace(&nt_ace_list[num_aces++],
2964 SEC_ACE_FLAG_OBJECT_INHERIT|
2965 SEC_ACE_FLAG_CONTAINER_INHERIT|
2966 SEC_ACE_FLAG_INHERIT_ONLY|
2968 SEC_ACE_FLAG_INHERITED_ACE : 0));
2971 /* The User must have access to a profile share - even
2972 * if we can't map the SID. */
2973 if (lp_profile_acls(SNUM(conn))) {
2976 init_sec_access(&acc,FILE_GENERIC_ALL);
2977 init_sec_ace(&nt_ace_list[num_aces++], &global_sid_Builtin_Users, SEC_ACE_TYPE_ACCESS_ALLOWED, acc,
2978 SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT|
2979 SEC_ACE_FLAG_INHERIT_ONLY|0);
2983 * Merge POSIX default ACLs and normal ACLs into one NT ACE.
2984 * Win2K needs this to get the inheritance correct when replacing ACLs
2985 * on a directory tree. Based on work by Jim @ IBM.
2988 num_aces = merge_default_aces(nt_ace_list, num_aces);
2993 if((psa = make_sec_acl( main_loop_talloc_get(), NT4_ACL_REVISION, num_aces, nt_ace_list)) == NULL) {
2994 DEBUG(0,("get_nt_acl: Unable to malloc space for acl.\n"));
2998 } /* security_info & DACL_SECURITY_INFORMATION */
3000 psd = make_standard_sec_desc( main_loop_talloc_get(),
3001 (security_info & OWNER_SECURITY_INFORMATION) ? &owner_sid : NULL,
3002 (security_info & GROUP_SECURITY_INFORMATION) ? &group_sid : NULL,
3007 DEBUG(0,("get_nt_acl: Unable to malloc space for security descriptor.\n"));
3013 * Windows 2000: The DACL_PROTECTED flag in the security
3014 * descriptor marks the ACL as non-inheriting, i.e., no
3015 * ACEs from higher level directories propagate to this
3016 * ACL. In the POSIX ACL model permissions are only
3017 * inherited at file create time, so ACLs never contain
3018 * any ACEs that are inherited dynamically. The DACL_PROTECTED
3019 * flag doesn't seem to bother Windows NT.
3020 * Always set this if map acl inherit is turned off.
3022 if (get_protected_flag(pal) || !lp_map_acl_inherit(SNUM(conn))) {
3023 psd->type |= SE_DESC_DACL_PROTECTED;
3027 dacl_sort_into_canonical_order(psd->dacl->aces, (unsigned int)psd->dacl->num_aces);
3035 SMB_VFS_SYS_ACL_FREE_ACL(conn, posix_acl);
3038 SMB_VFS_SYS_ACL_FREE_ACL(conn, def_acl);
3040 free_canon_ace_list(file_ace);
3041 free_canon_ace_list(dir_ace);
3042 free_inherited_info(pal);
3043 SAFE_FREE(nt_ace_list);
3048 /****************************************************************************
3049 Try to chown a file. We will be able to chown it under the following conditions.
3051 1) If we have root privileges, then it will just work.
3052 2) If we have SeTakeOwnershipPrivilege we can change the user to the current user.
3053 3) If we have SeRestorePrivilege we can change the user to any other user.
3054 4) If we have write permission to the file and dos_filemodes is set
3055 then allow chown to the currently authenticated user.
3056 ****************************************************************************/
3058 int try_chown(connection_struct *conn, const char *fname, uid_t uid, gid_t gid)
3064 if(!CAN_WRITE(conn)) {
3069 /* try the direct way first */
3070 ret = SMB_VFS_CHOWN(conn, fname, uid, gid);
3074 /* Case (2) / (3) */
3075 if (lp_enable_privileges()) {
3077 BOOL has_take_ownership_priv = user_has_privileges(current_user.nt_user_token,
3078 &se_take_ownership);
3079 BOOL has_restore_priv = user_has_privileges(current_user.nt_user_token,
3083 if ( ( has_take_ownership_priv && ( uid == current_user.ut.uid ) ) ||
3085 ( has_restore_priv ) ) {
3088 /* Keep the current file gid the same - take ownership doesn't imply group change. */
3089 ret = SMB_VFS_CHOWN(conn, fname, uid, (gid_t)-1);
3096 if (!lp_dos_filemode(SNUM(conn))) {
3100 if (SMB_VFS_STAT(conn,fname,&st)) {
3104 if (!NT_STATUS_IS_OK(open_file_fchmod(conn,fname,&st,&fsp))) {
3108 /* only allow chown to the current user. This is more secure,
3109 and also copes with the case where the SID in a take ownership ACL is
3110 a local SID on the users workstation
3112 uid = current_user.ut.uid;
3115 /* Keep the current file gid the same. */
3116 ret = SMB_VFS_FCHOWN(fsp, fsp->fh->fd, uid, (gid_t)-1);
3119 close_file_fchmod(fsp);
3125 /* Disable this - prevents ACL inheritance from the ACL editor. JRA. */
3127 /****************************************************************************
3128 Take care of parent ACL inheritance.
3129 ****************************************************************************/
3131 static NTSTATUS append_parent_acl(files_struct *fsp,
3132 SMB_STRUCT_STAT *psbuf,
3134 SEC_DESC **pp_new_sd)
3136 SEC_DESC *parent_sd = NULL;
3137 files_struct *parent_fsp = NULL;
3138 TALLOC_CTX *mem_ctx = talloc_parent(psd);
3139 char *parent_name = NULL;
3140 SEC_ACE *new_ace = NULL;
3141 unsigned int num_aces = psd->dacl->num_aces;
3142 SMB_STRUCT_STAT sbuf;
3147 BOOL is_dacl_protected = (psd->type & SE_DESC_DACL_PROTECTED);
3151 if (mem_ctx == NULL) {
3152 return NT_STATUS_NO_MEMORY;
3155 if (!parent_dirname_talloc(mem_ctx,
3159 return NT_STATUS_NO_MEMORY;
3162 status = open_directory(fsp->conn,
3165 FILE_READ_ATTRIBUTES, /* Just a stat open */
3166 FILE_SHARE_NONE, /* Ignored for stat opens */
3173 if (!NT_STATUS_IS_OK(status)) {
3177 sd_size = SMB_VFS_GET_NT_ACL(parent_fsp, parent_fsp->fsp_name,
3178 DACL_SECURITY_INFORMATION, &parent_sd );
3180 close_file(parent_fsp, NORMAL_CLOSE);
3183 return NT_STATUS_ACCESS_DENIED;
3187 * Make room for potentially all the ACLs from
3188 * the parent. We used to add the ugw triple here,
3189 * as we knew we were dealing with POSIX ACLs.
3190 * We no longer need to do so as we can guarentee
3191 * that a default ACL from the parent directory will
3192 * be well formed for POSIX ACLs if it came from a
3193 * POSIX ACL source, and if we're not writing to a
3194 * POSIX ACL sink then we don't care if it's not well
3198 num_aces += parent_sd->dacl->num_aces;
3200 if((new_ace = TALLOC_ZERO_ARRAY(mem_ctx, SEC_ACE,
3201 num_aces)) == NULL) {
3202 return NT_STATUS_NO_MEMORY;
3205 /* Start by copying in all the given ACE entries. */
3206 for (i = 0; i < psd->dacl->num_aces; i++) {
3207 sec_ace_copy(&new_ace[i], &psd->dacl->aces[i]);
3211 * Note that we're ignoring "inherit permissions" here
3212 * as that really only applies to newly created files. JRA.
3215 /* Finally append any inherited ACEs. */
3216 for (j = 0; j < parent_sd->dacl->num_aces; j++) {
3217 SEC_ACE *se = &parent_sd->dacl->aces[j];
3219 if (fsp->is_directory) {
3220 if (!(se->flags & SEC_ACE_FLAG_CONTAINER_INHERIT)) {
3221 /* Doesn't apply to a directory - ignore. */
3222 DEBUG(10,("append_parent_acl: directory %s "
3223 "ignoring non container "
3224 "inherit flags %u on ACE with sid %s "
3227 (unsigned int)se->flags,
3228 sid_string_static(&se->trustee),
3233 if (!(se->flags & SEC_ACE_FLAG_OBJECT_INHERIT)) {
3234 /* Doesn't apply to a file - ignore. */
3235 DEBUG(10,("append_parent_acl: file %s "
3236 "ignoring non object "
3237 "inherit flags %u on ACE with sid %s "
3240 (unsigned int)se->flags,
3241 sid_string_static(&se->trustee),
3247 if (is_dacl_protected) {
3248 /* If the DACL is protected it means we must
3249 * not overwrite an existing ACE entry with the
3250 * same SID. This is order N^2. Ouch :-(. JRA. */
3252 for (k = 0; k < psd->dacl->num_aces; k++) {
3253 if (sid_equal(&psd->dacl->aces[k].trustee,
3258 if (k < psd->dacl->num_aces) {
3259 /* SID matched. Ignore. */
3260 DEBUG(10,("append_parent_acl: path %s "
3261 "ignoring ACE with protected sid %s "
3264 sid_string_static(&se->trustee),
3270 sec_ace_copy(&new_ace[i], se);
3271 if (se->flags & SEC_ACE_FLAG_NO_PROPAGATE_INHERIT) {
3272 new_ace[i].flags &= ~(SEC_ACE_FLAG_VALID_INHERIT);
3274 new_ace[i].flags |= SEC_ACE_FLAG_INHERITED_ACE;
3276 if (fsp->is_directory) {
3278 * Strip off any inherit only. It's applied.
3280 new_ace[i].flags &= ~(SEC_ACE_FLAG_INHERIT_ONLY);
3281 if (se->flags & SEC_ACE_FLAG_NO_PROPAGATE_INHERIT) {
3282 /* No further inheritance. */
3284 ~(SEC_ACE_FLAG_CONTAINER_INHERIT|
3285 SEC_ACE_FLAG_OBJECT_INHERIT);
3289 * Strip off any container or inherit
3290 * flags, they can't apply to objects.
3292 new_ace[i].flags &= ~(SEC_ACE_FLAG_CONTAINER_INHERIT|
3293 SEC_ACE_FLAG_INHERIT_ONLY|
3294 SEC_ACE_FLAG_NO_PROPAGATE_INHERIT);
3299 DEBUG(10,("append_parent_acl: path %s "
3300 "inheriting ACE with sid %s "
3303 sid_string_static(&se->trustee),
3308 /* This sucks. psd should be const and we should
3309 * be doing a deep-copy here. We're getting away
3310 * with is as we know parent_sd is talloced off
3311 * talloc_tos() as well as psd. JRA. */
3313 psd->dacl->aces = new_ace;
3314 psd->dacl->num_aces = i;
3315 psd->type &= ~(SE_DESC_DACL_AUTO_INHERITED|
3316 SE_DESC_DACL_AUTO_INHERIT_REQ);
3323 /****************************************************************************
3324 Reply to set a security descriptor on an fsp. security_info_sent is the
3325 description of the following NT ACL.
3326 This should be the only external function needed for the UNIX style set ACL.
3327 ****************************************************************************/
3329 BOOL set_nt_acl(files_struct *fsp, uint32 security_info_sent, SEC_DESC *psd)
3331 connection_struct *conn = fsp->conn;
3332 uid_t user = (uid_t)-1;
3333 gid_t grp = (gid_t)-1;
3334 SMB_STRUCT_STAT sbuf;
3335 DOM_SID file_owner_sid;
3336 DOM_SID file_grp_sid;
3337 canon_ace *file_ace_list = NULL;
3338 canon_ace *dir_ace_list = NULL;
3339 BOOL acl_perms = False;
3340 mode_t orig_mode = (mode_t)0;
3344 DEBUG(10,("set_nt_acl: called for file %s\n", fsp->fsp_name ));
3346 if (!CAN_WRITE(conn)) {
3347 DEBUG(10,("set acl rejected on read-only share\n"));
3352 * Get the current state of the file.
3355 if(fsp->is_directory || fsp->fh->fd == -1) {
3356 if(SMB_VFS_STAT(fsp->conn,fsp->fsp_name, &sbuf) != 0)
3359 if(SMB_VFS_FSTAT(fsp,fsp->fh->fd,&sbuf) != 0)
3363 /* Save the original elements we check against. */
3364 orig_mode = sbuf.st_mode;
3365 orig_uid = sbuf.st_uid;
3366 orig_gid = sbuf.st_gid;
3369 * Unpack the user/group/world id's.
3372 if (!unpack_nt_owners( SNUM(conn), &user, &grp, security_info_sent, psd)) {
3377 * Do we need to chown ?
3380 if (((user != (uid_t)-1) && (orig_uid != user)) || (( grp != (gid_t)-1) && (orig_gid != grp))) {
3382 DEBUG(3,("set_nt_acl: chown %s. uid = %u, gid = %u.\n",
3383 fsp->fsp_name, (unsigned int)user, (unsigned int)grp ));
3385 if(try_chown( fsp->conn, fsp->fsp_name, user, grp) == -1) {
3386 DEBUG(3,("set_nt_acl: chown %s, %u, %u failed. Error = %s.\n",
3387 fsp->fsp_name, (unsigned int)user, (unsigned int)grp, strerror(errno) ));
3392 * Recheck the current state of the file, which may have changed.
3393 * (suid/sgid bits, for instance)
3396 if(fsp->is_directory) {
3397 if(SMB_VFS_STAT(fsp->conn, fsp->fsp_name, &sbuf) != 0) {
3404 if(fsp->fh->fd == -1)
3405 ret = SMB_VFS_STAT(fsp->conn, fsp->fsp_name, &sbuf);
3407 ret = SMB_VFS_FSTAT(fsp,fsp->fh->fd,&sbuf);
3413 /* Save the original elements we check against. */
3414 orig_mode = sbuf.st_mode;
3415 orig_uid = sbuf.st_uid;
3416 orig_gid = sbuf.st_gid;
3419 create_file_sids(&sbuf, &file_owner_sid, &file_grp_sid);
3422 /* Disable this - prevents ACL inheritance from the ACL editor. JRA. */
3424 /* See here: http://www.codeproject.com/KB/winsdk/accessctrl2.aspx
3425 * for details and also the log trace in bug #4308. JRA.
3428 if ((security_info_sent & DACL_SECURITY_INFORMATION) &&
3429 psd->dacl != NULL &&
3430 (psd->type & (SE_DESC_DACL_AUTO_INHERITED|
3431 SE_DESC_DACL_AUTO_INHERIT_REQ))==
3432 (SE_DESC_DACL_AUTO_INHERITED|
3433 SE_DESC_DACL_AUTO_INHERIT_REQ) ) {
3434 NTSTATUS status = append_parent_acl(fsp, &sbuf, psd, &psd);
3435 if (!NT_STATUS_IS_OK(status)) {
3441 acl_perms = unpack_canon_ace( fsp, &sbuf, &file_owner_sid, &file_grp_sid,
3442 &file_ace_list, &dir_ace_list, security_info_sent, psd);
3444 /* Ignore W2K traverse DACL set. */
3445 if (file_ace_list || dir_ace_list) {
3448 DEBUG(3,("set_nt_acl: cannot set permissions\n"));
3449 free_canon_ace_list(file_ace_list);
3450 free_canon_ace_list(dir_ace_list);
3455 * Only change security if we got a DACL.
3458 if((security_info_sent & DACL_SECURITY_INFORMATION) && (psd->dacl != NULL)) {
3460 BOOL acl_set_support = False;
3464 * Try using the POSIX ACL set first. Fall back to chmod if
3465 * we have no ACL support on this filesystem.
3468 if (acl_perms && file_ace_list) {
3469 ret = set_canon_ace_list(fsp, file_ace_list, False, sbuf.st_gid, &acl_set_support);
3470 if (acl_set_support && ret == False) {
3471 DEBUG(3,("set_nt_acl: failed to set file acl on file %s (%s).\n", fsp->fsp_name, strerror(errno) ));
3472 free_canon_ace_list(file_ace_list);
3473 free_canon_ace_list(dir_ace_list);
3478 if (acl_perms && acl_set_support && fsp->is_directory) {
3480 if (!set_canon_ace_list(fsp, dir_ace_list, True, sbuf.st_gid, &acl_set_support)) {
3481 DEBUG(3,("set_nt_acl: failed to set default acl on directory %s (%s).\n", fsp->fsp_name, strerror(errno) ));
3482 free_canon_ace_list(file_ace_list);
3483 free_canon_ace_list(dir_ace_list);
3489 * No default ACL - delete one if it exists.
3492 if (SMB_VFS_SYS_ACL_DELETE_DEF_FILE(conn, fsp->fsp_name) == -1) {
3495 if (acl_group_override(conn, sbuf.st_gid, fsp->fsp_name)) {
3496 DEBUG(5,("set_nt_acl: acl group control on and "
3497 "current user in file %s primary group. Override delete_def_acl\n",
3501 sret = SMB_VFS_SYS_ACL_DELETE_DEF_FILE(conn, fsp->fsp_name);
3506 DEBUG(3,("set_nt_acl: sys_acl_delete_def_file failed (%s)\n", strerror(errno)));
3507 free_canon_ace_list(file_ace_list);
3508 free_canon_ace_list(dir_ace_list);
3515 if (acl_set_support) {
3516 store_inheritance_attributes(fsp, file_ace_list, dir_ace_list,
3517 (psd->type & SE_DESC_DACL_PROTECTED) ? True : False);
3521 * If we cannot set using POSIX ACLs we fall back to checking if we need to chmod.
3524 if(!acl_set_support && acl_perms) {
3527 if (!convert_canon_ace_to_posix_perms( fsp, file_ace_list, &posix_perms)) {
3528 free_canon_ace_list(file_ace_list);
3529 free_canon_ace_list(dir_ace_list);
3530 DEBUG(3,("set_nt_acl: failed to convert file acl to posix permissions for file %s.\n",
3535 if (orig_mode != posix_perms) {
3537 DEBUG(3,("set_nt_acl: chmod %s. perms = 0%o.\n",
3538 fsp->fsp_name, (unsigned int)posix_perms ));
3540 if(SMB_VFS_CHMOD(conn,fsp->fsp_name, posix_perms) == -1) {
3542 if (acl_group_override(conn, sbuf.st_gid, fsp->fsp_name)) {
3543 DEBUG(5,("set_nt_acl: acl group control on and "
3544 "current user in file %s primary group. Override chmod\n",
3548 sret = SMB_VFS_CHMOD(conn,fsp->fsp_name, posix_perms);
3553 DEBUG(3,("set_nt_acl: chmod %s, 0%o failed. Error = %s.\n",
3554 fsp->fsp_name, (unsigned int)posix_perms, strerror(errno) ));
3555 free_canon_ace_list(file_ace_list);
3556 free_canon_ace_list(dir_ace_list);
3564 free_canon_ace_list(file_ace_list);
3565 free_canon_ace_list(dir_ace_list);
3571 /****************************************************************************
3572 Get the actual group bits stored on a file with an ACL. Has no effect if
3573 the file has no ACL. Needed in dosmode code where the stat() will return
3574 the mask bits, not the real group bits, for a file with an ACL.
3575 ****************************************************************************/
3577 int get_acl_group_bits( connection_struct *conn, const char *fname, mode_t *mode )
3579 int entry_id = SMB_ACL_FIRST_ENTRY;
3580 SMB_ACL_ENTRY_T entry;
3581 SMB_ACL_T posix_acl;
3584 posix_acl = SMB_VFS_SYS_ACL_GET_FILE(conn, fname, SMB_ACL_TYPE_ACCESS);
3585 if (posix_acl == (SMB_ACL_T)NULL)
3588 while (SMB_VFS_SYS_ACL_GET_ENTRY(conn, posix_acl, entry_id, &entry) == 1) {
3589 SMB_ACL_TAG_T tagtype;
3590 SMB_ACL_PERMSET_T permset;
3593 if (entry_id == SMB_ACL_FIRST_ENTRY)
3594 entry_id = SMB_ACL_NEXT_ENTRY;
3596 if (SMB_VFS_SYS_ACL_GET_TAG_TYPE(conn, entry, &tagtype) ==-1)
3599 if (tagtype == SMB_ACL_GROUP_OBJ) {
3600 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, entry, &permset) == -1) {
3603 *mode &= ~(S_IRGRP|S_IWGRP|S_IXGRP);
3604 *mode |= (SMB_VFS_SYS_ACL_GET_PERM(conn, permset, SMB_ACL_READ) ? S_IRGRP : 0);
3605 *mode |= (SMB_VFS_SYS_ACL_GET_PERM(conn, permset, SMB_ACL_WRITE) ? S_IWGRP : 0);
3606 *mode |= (SMB_VFS_SYS_ACL_GET_PERM(conn, permset, SMB_ACL_EXECUTE) ? S_IXGRP : 0);
3612 SMB_VFS_SYS_ACL_FREE_ACL(conn, posix_acl);
3616 /****************************************************************************
3617 Do a chmod by setting the ACL USER_OBJ, GROUP_OBJ and OTHER bits in an ACL
3618 and set the mask to rwx. Needed to preserve complex ACLs set by NT.
3619 ****************************************************************************/
3621 static int chmod_acl_internals( connection_struct *conn, SMB_ACL_T posix_acl, mode_t mode)
3623 int entry_id = SMB_ACL_FIRST_ENTRY;
3624 SMB_ACL_ENTRY_T entry;
3625 int num_entries = 0;
3627 while ( SMB_VFS_SYS_ACL_GET_ENTRY(conn, posix_acl, entry_id, &entry) == 1) {
3628 SMB_ACL_TAG_T tagtype;
3629 SMB_ACL_PERMSET_T permset;
3633 if (entry_id == SMB_ACL_FIRST_ENTRY)
3634 entry_id = SMB_ACL_NEXT_ENTRY;
3636 if (SMB_VFS_SYS_ACL_GET_TAG_TYPE(conn, entry, &tagtype) == -1)
3639 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, entry, &permset) == -1)
3645 case SMB_ACL_USER_OBJ:
3646 perms = unix_perms_to_acl_perms(mode, S_IRUSR, S_IWUSR, S_IXUSR);
3648 case SMB_ACL_GROUP_OBJ:
3649 perms = unix_perms_to_acl_perms(mode, S_IRGRP, S_IWGRP, S_IXGRP);
3653 * FIXME: The ACL_MASK entry permissions should really be set to
3654 * the union of the permissions of all ACL_USER,
3655 * ACL_GROUP_OBJ, and ACL_GROUP entries. That's what
3656 * acl_calc_mask() does, but Samba ACLs doesn't provide it.
3658 perms = S_IRUSR|S_IWUSR|S_IXUSR;
3661 perms = unix_perms_to_acl_perms(mode, S_IROTH, S_IWOTH, S_IXOTH);
3667 if (map_acl_perms_to_permset(conn, perms, &permset) == -1)
3670 if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, entry, permset) == -1)
3675 * If this is a simple 3 element ACL or no elements then it's a standard
3676 * UNIX permission set. Just use chmod...
3679 if ((num_entries == 3) || (num_entries == 0))
3685 /****************************************************************************
3686 Get the access ACL of FROM, do a chmod by setting the ACL USER_OBJ,
3687 GROUP_OBJ and OTHER bits in an ACL and set the mask to rwx. Set the
3688 resulting ACL on TO. Note that name is in UNIX character set.
3689 ****************************************************************************/
3691 static int copy_access_acl(connection_struct *conn, const char *from, const char *to, mode_t mode)
3693 SMB_ACL_T posix_acl = NULL;
3696 if ((posix_acl = SMB_VFS_SYS_ACL_GET_FILE(conn, from, SMB_ACL_TYPE_ACCESS)) == NULL)
3699 if ((ret = chmod_acl_internals(conn, posix_acl, mode)) == -1)
3702 ret = SMB_VFS_SYS_ACL_SET_FILE(conn, to, SMB_ACL_TYPE_ACCESS, posix_acl);
3706 SMB_VFS_SYS_ACL_FREE_ACL(conn, posix_acl);
3710 /****************************************************************************
3711 Do a chmod by setting the ACL USER_OBJ, GROUP_OBJ and OTHER bits in an ACL
3712 and set the mask to rwx. Needed to preserve complex ACLs set by NT.
3713 Note that name is in UNIX character set.
3714 ****************************************************************************/
3716 int chmod_acl(connection_struct *conn, const char *name, mode_t mode)
3718 return copy_access_acl(conn, name, name, mode);
3721 /****************************************************************************
3722 If the parent directory has no default ACL but it does have an Access ACL,
3723 inherit this Access ACL to file name.
3724 ****************************************************************************/
3726 int inherit_access_acl(connection_struct *conn, const char *inherit_from_dir,
3727 const char *name, mode_t mode)
3729 if (directory_has_default_acl(conn, inherit_from_dir))
3732 return copy_access_acl(conn, inherit_from_dir, name, mode);
3735 /****************************************************************************
3736 Do an fchmod by setting the ACL USER_OBJ, GROUP_OBJ and OTHER bits in an ACL
3737 and set the mask to rwx. Needed to preserve complex ACLs set by NT.
3738 ****************************************************************************/
3740 int fchmod_acl(files_struct *fsp, int fd, mode_t mode)
3742 connection_struct *conn = fsp->conn;
3743 SMB_ACL_T posix_acl = NULL;
3746 if ((posix_acl = SMB_VFS_SYS_ACL_GET_FD(fsp, fd)) == NULL)
3749 if ((ret = chmod_acl_internals(conn, posix_acl, mode)) == -1)
3752 ret = SMB_VFS_SYS_ACL_SET_FD(fsp, fd, posix_acl);
3756 SMB_VFS_SYS_ACL_FREE_ACL(conn, posix_acl);
3760 /****************************************************************************
3761 Check for an existing default POSIX ACL on a directory.
3762 ****************************************************************************/
3764 BOOL directory_has_default_acl(connection_struct *conn, const char *fname)
3766 SMB_ACL_T def_acl = SMB_VFS_SYS_ACL_GET_FILE( conn, fname, SMB_ACL_TYPE_DEFAULT);
3767 BOOL has_acl = False;
3768 SMB_ACL_ENTRY_T entry;
3770 if (def_acl != NULL && (SMB_VFS_SYS_ACL_GET_ENTRY(conn, def_acl, SMB_ACL_FIRST_ENTRY, &entry) == 1)) {
3775 SMB_VFS_SYS_ACL_FREE_ACL(conn, def_acl);
3780 /****************************************************************************
3781 Map from wire type to permset.
3782 ****************************************************************************/
3784 static BOOL unix_ex_wire_to_permset(connection_struct *conn, unsigned char wire_perm, SMB_ACL_PERMSET_T *p_permset)
3786 if (wire_perm & ~(SMB_POSIX_ACL_READ|SMB_POSIX_ACL_WRITE|SMB_POSIX_ACL_EXECUTE)) {
3790 if (SMB_VFS_SYS_ACL_CLEAR_PERMS(conn, *p_permset) == -1) {
3794 if (wire_perm & SMB_POSIX_ACL_READ) {
3795 if (SMB_VFS_SYS_ACL_ADD_PERM(conn, *p_permset, SMB_ACL_READ) == -1) {
3799 if (wire_perm & SMB_POSIX_ACL_WRITE) {
3800 if (SMB_VFS_SYS_ACL_ADD_PERM(conn, *p_permset, SMB_ACL_WRITE) == -1) {
3804 if (wire_perm & SMB_POSIX_ACL_EXECUTE) {
3805 if (SMB_VFS_SYS_ACL_ADD_PERM(conn, *p_permset, SMB_ACL_EXECUTE) == -1) {
3812 /****************************************************************************
3813 Map from wire type to tagtype.
3814 ****************************************************************************/
3816 static BOOL unix_ex_wire_to_tagtype(unsigned char wire_tt, SMB_ACL_TAG_T *p_tt)
3819 case SMB_POSIX_ACL_USER_OBJ:
3820 *p_tt = SMB_ACL_USER_OBJ;
3822 case SMB_POSIX_ACL_USER:
3823 *p_tt = SMB_ACL_USER;
3825 case SMB_POSIX_ACL_GROUP_OBJ:
3826 *p_tt = SMB_ACL_GROUP_OBJ;
3828 case SMB_POSIX_ACL_GROUP:
3829 *p_tt = SMB_ACL_GROUP;
3831 case SMB_POSIX_ACL_MASK:
3832 *p_tt = SMB_ACL_MASK;
3834 case SMB_POSIX_ACL_OTHER:
3835 *p_tt = SMB_ACL_OTHER;
3843 /****************************************************************************
3844 Create a new POSIX acl from wire permissions.
3845 FIXME ! How does the share mask/mode fit into this.... ?
3846 ****************************************************************************/
3848 static SMB_ACL_T create_posix_acl_from_wire(connection_struct *conn, uint16 num_acls, const char *pdata)
3851 SMB_ACL_T the_acl = SMB_VFS_SYS_ACL_INIT(conn, num_acls);
3853 if (the_acl == NULL) {
3857 for (i = 0; i < num_acls; i++) {
3858 SMB_ACL_ENTRY_T the_entry;
3859 SMB_ACL_PERMSET_T the_permset;
3860 SMB_ACL_TAG_T tag_type;
3862 if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &the_acl, &the_entry) == -1) {
3863 DEBUG(0,("create_posix_acl_from_wire: Failed to create entry %u. (%s)\n",
3864 i, strerror(errno) ));
3868 if (!unix_ex_wire_to_tagtype(CVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)), &tag_type)) {
3869 DEBUG(0,("create_posix_acl_from_wire: invalid wire tagtype %u on entry %u.\n",
3870 CVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)), i ));
3874 if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, the_entry, tag_type) == -1) {
3875 DEBUG(0,("create_posix_acl_from_wire: Failed to set tagtype on entry %u. (%s)\n",
3876 i, strerror(errno) ));
3880 /* Get the permset pointer from the new ACL entry. */
3881 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, the_entry, &the_permset) == -1) {
3882 DEBUG(0,("create_posix_acl_from_wire: Failed to get permset on entry %u. (%s)\n",
3883 i, strerror(errno) ));
3887 /* Map from wire to permissions. */
3888 if (!unix_ex_wire_to_permset(conn, CVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)+1), &the_permset)) {
3889 DEBUG(0,("create_posix_acl_from_wire: invalid permset %u on entry %u.\n",
3890 CVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE) + 1), i ));
3894 /* Now apply to the new ACL entry. */
3895 if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, the_entry, the_permset) == -1) {
3896 DEBUG(0,("create_posix_acl_from_wire: Failed to add permset on entry %u. (%s)\n",
3897 i, strerror(errno) ));
3901 if (tag_type == SMB_ACL_USER) {
3902 uint32 uidval = IVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)+2);
3903 uid_t uid = (uid_t)uidval;
3904 if (SMB_VFS_SYS_ACL_SET_QUALIFIER(conn, the_entry,(void *)&uid) == -1) {
3905 DEBUG(0,("create_posix_acl_from_wire: Failed to set uid %u on entry %u. (%s)\n",
3906 (unsigned int)uid, i, strerror(errno) ));
3911 if (tag_type == SMB_ACL_GROUP) {
3912 uint32 gidval = IVAL(pdata,(i*SMB_POSIX_ACL_ENTRY_SIZE)+2);
3913 gid_t gid = (uid_t)gidval;
3914 if (SMB_VFS_SYS_ACL_SET_QUALIFIER(conn, the_entry,(void *)&gid) == -1) {
3915 DEBUG(0,("create_posix_acl_from_wire: Failed to set gid %u on entry %u. (%s)\n",
3916 (unsigned int)gid, i, strerror(errno) ));
3926 if (the_acl != NULL) {
3927 SMB_VFS_SYS_ACL_FREE_ACL(conn, the_acl);
3932 /****************************************************************************
3933 Calls from UNIX extensions - Default POSIX ACL set.
3934 If num_def_acls == 0 and not a directory just return. If it is a directory
3935 and num_def_acls == 0 then remove the default acl. Else set the default acl
3937 ****************************************************************************/
3939 BOOL set_unix_posix_default_acl(connection_struct *conn, const char *fname, SMB_STRUCT_STAT *psbuf,
3940 uint16 num_def_acls, const char *pdata)
3942 SMB_ACL_T def_acl = NULL;
3944 if (num_def_acls && !S_ISDIR(psbuf->st_mode)) {
3945 DEBUG(5,("set_unix_posix_default_acl: Can't set default ACL on non-directory file %s\n", fname ));
3950 if (!num_def_acls) {
3951 /* Remove the default ACL. */
3952 if (SMB_VFS_SYS_ACL_DELETE_DEF_FILE(conn, fname) == -1) {
3953 DEBUG(5,("set_unix_posix_default_acl: acl_delete_def_file failed on directory %s (%s)\n",
3954 fname, strerror(errno) ));
3960 if ((def_acl = create_posix_acl_from_wire(conn, num_def_acls, pdata)) == NULL) {
3964 if (SMB_VFS_SYS_ACL_SET_FILE(conn, fname, SMB_ACL_TYPE_DEFAULT, def_acl) == -1) {
3965 DEBUG(5,("set_unix_posix_default_acl: acl_set_file failed on directory %s (%s)\n",
3966 fname, strerror(errno) ));
3967 SMB_VFS_SYS_ACL_FREE_ACL(conn, def_acl);
3971 DEBUG(10,("set_unix_posix_default_acl: set default acl for file %s\n", fname ));
3972 SMB_VFS_SYS_ACL_FREE_ACL(conn, def_acl);
3976 /****************************************************************************
3977 Remove an ACL from a file. As we don't have acl_delete_entry() available
3978 we must read the current acl and copy all entries except MASK, USER and GROUP
3979 to a new acl, then set that. This (at least on Linux) causes any ACL to be
3981 FIXME ! How does the share mask/mode fit into this.... ?
3982 ****************************************************************************/
3984 static BOOL remove_posix_acl(connection_struct *conn, files_struct *fsp, const char *fname)
3986 SMB_ACL_T file_acl = NULL;
3987 int entry_id = SMB_ACL_FIRST_ENTRY;
3988 SMB_ACL_ENTRY_T entry;
3990 /* Create a new ACL with only 3 entries, u/g/w. */
3991 SMB_ACL_T new_file_acl = SMB_VFS_SYS_ACL_INIT(conn, 3);
3992 SMB_ACL_ENTRY_T user_ent = NULL;
3993 SMB_ACL_ENTRY_T group_ent = NULL;
3994 SMB_ACL_ENTRY_T other_ent = NULL;
3996 if (new_file_acl == NULL) {
3997 DEBUG(5,("remove_posix_acl: failed to init new ACL with 3 entries for file %s.\n", fname));
4001 /* Now create the u/g/w entries. */
4002 if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &new_file_acl, &user_ent) == -1) {
4003 DEBUG(5,("remove_posix_acl: Failed to create user entry for file %s. (%s)\n",
4004 fname, strerror(errno) ));
4007 if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, user_ent, SMB_ACL_USER_OBJ) == -1) {
4008 DEBUG(5,("remove_posix_acl: Failed to set user entry for file %s. (%s)\n",
4009 fname, strerror(errno) ));
4013 if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &new_file_acl, &group_ent) == -1) {
4014 DEBUG(5,("remove_posix_acl: Failed to create group entry for file %s. (%s)\n",
4015 fname, strerror(errno) ));
4018 if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, group_ent, SMB_ACL_GROUP_OBJ) == -1) {
4019 DEBUG(5,("remove_posix_acl: Failed to set group entry for file %s. (%s)\n",
4020 fname, strerror(errno) ));
4024 if (SMB_VFS_SYS_ACL_CREATE_ENTRY(conn, &new_file_acl, &other_ent) == -1) {
4025 DEBUG(5,("remove_posix_acl: Failed to create other entry for file %s. (%s)\n",
4026 fname, strerror(errno) ));
4029 if (SMB_VFS_SYS_ACL_SET_TAG_TYPE(conn, other_ent, SMB_ACL_OTHER) == -1) {
4030 DEBUG(5,("remove_posix_acl: Failed to set other entry for file %s. (%s)\n",
4031 fname, strerror(errno) ));
4035 /* Get the current file ACL. */
4036 if (fsp && fsp->fh->fd != -1) {
4037 file_acl = SMB_VFS_SYS_ACL_GET_FD(fsp, fsp->fh->fd);
4039 file_acl = SMB_VFS_SYS_ACL_GET_FILE( conn, fname, SMB_ACL_TYPE_ACCESS);
4042 if (file_acl == NULL) {
4043 /* This is only returned if an error occurred. Even for a file with
4044 no acl a u/g/w acl should be returned. */
4045 DEBUG(5,("remove_posix_acl: failed to get ACL from file %s (%s).\n",
4046 fname, strerror(errno) ));
4050 while ( SMB_VFS_SYS_ACL_GET_ENTRY(conn, file_acl, entry_id, &entry) == 1) {
4051 SMB_ACL_TAG_T tagtype;
4052 SMB_ACL_PERMSET_T permset;
4055 if (entry_id == SMB_ACL_FIRST_ENTRY)
4056 entry_id = SMB_ACL_NEXT_ENTRY;
4058 if (SMB_VFS_SYS_ACL_GET_TAG_TYPE(conn, entry, &tagtype) == -1) {
4059 DEBUG(5,("remove_posix_acl: failed to get tagtype from ACL on file %s (%s).\n",
4060 fname, strerror(errno) ));
4064 if (SMB_VFS_SYS_ACL_GET_PERMSET(conn, entry, &permset) == -1) {
4065 DEBUG(5,("remove_posix_acl: failed to get permset from ACL on file %s (%s).\n",
4066 fname, strerror(errno) ));
4070 if (tagtype == SMB_ACL_USER_OBJ) {
4071 if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, user_ent, permset) == -1) {
4072 DEBUG(5,("remove_posix_acl: failed to set permset from ACL on file %s (%s).\n",
4073 fname, strerror(errno) ));
4075 } else if (tagtype == SMB_ACL_GROUP_OBJ) {
4076 if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, group_ent, permset) == -1) {
4077 DEBUG(5,("remove_posix_acl: failed to set permset from ACL on file %s (%s).\n",
4078 fname, strerror(errno) ));
4080 } else if (tagtype == SMB_ACL_OTHER) {
4081 if (SMB_VFS_SYS_ACL_SET_PERMSET(conn, other_ent, permset) == -1) {
4082 DEBUG(5,("remove_posix_acl: failed to set permset from ACL on file %s (%s).\n",
4083 fname, strerror(errno) ));
4088 /* Set the new empty file ACL. */
4089 if (fsp && fsp->fh->fd != -1) {
4090 if (SMB_VFS_SYS_ACL_SET_FD(fsp, fsp->fh->fd, new_file_acl) == -1) {
4091 DEBUG(5,("remove_posix_acl: acl_set_file failed on %s (%s)\n",
4092 fname, strerror(errno) ));
4096 if (SMB_VFS_SYS_ACL_SET_FILE(conn, fname, SMB_ACL_TYPE_ACCESS, new_file_acl) == -1) {
4097 DEBUG(5,("remove_posix_acl: acl_set_file failed on %s (%s)\n",
4098 fname, strerror(errno) ));
4108 SMB_VFS_SYS_ACL_FREE_ACL(conn, file_acl);
4111 SMB_VFS_SYS_ACL_FREE_ACL(conn, new_file_acl);
4116 /****************************************************************************
4117 Calls from UNIX extensions - POSIX ACL set.
4118 If num_def_acls == 0 then read/modify/write acl after removing all entries
4119 except SMB_ACL_USER_OBJ, SMB_ACL_GROUP_OBJ, SMB_ACL_OTHER.
4120 ****************************************************************************/
4122 BOOL set_unix_posix_acl(connection_struct *conn, files_struct *fsp, const char *fname, uint16 num_acls, const char *pdata)
4124 SMB_ACL_T file_acl = NULL;
4127 /* Remove the ACL from the file. */
4128 return remove_posix_acl(conn, fsp, fname);
4131 if ((file_acl = create_posix_acl_from_wire(conn, num_acls, pdata)) == NULL) {
4135 if (fsp && fsp->fh->fd != -1) {
4136 /* The preferred way - use an open fd. */
4137 if (SMB_VFS_SYS_ACL_SET_FD(fsp, fsp->fh->fd, file_acl) == -1) {
4138 DEBUG(5,("set_unix_posix_acl: acl_set_file failed on %s (%s)\n",
4139 fname, strerror(errno) ));
4140 SMB_VFS_SYS_ACL_FREE_ACL(conn, file_acl);
4144 if (SMB_VFS_SYS_ACL_SET_FILE(conn, fname, SMB_ACL_TYPE_ACCESS, file_acl) == -1) {
4145 DEBUG(5,("set_unix_posix_acl: acl_set_file failed on %s (%s)\n",
4146 fname, strerror(errno) ));
4147 SMB_VFS_SYS_ACL_FREE_ACL(conn, file_acl);
4152 DEBUG(10,("set_unix_posix_acl: set acl for file %s\n", fname ));
4153 SMB_VFS_SYS_ACL_FREE_ACL(conn, file_acl);
4157 /****************************************************************************
4158 Helper function that gets a security descriptor by connection and
4160 NOTE: This is transitional, in the sense that SMB_VFS_GET_NT_ACL really
4161 should *not* get a files_struct pointer but a connection_struct ptr
4162 (automatic by the vfs handle) and the file name and _use_ that!
4163 ****************************************************************************/
4164 static NTSTATUS conn_get_nt_acl(TALLOC_CTX *mem_ctx,
4165 struct connection_struct *conn,
4167 SMB_STRUCT_STAT *psbuf,
4168 struct security_descriptor_info **psd)
4171 struct files_struct *fsp = NULL;
4172 struct security_descriptor_info *secdesc = NULL;
4173 size_t secdesc_size;
4175 if (!VALID_STAT(*psbuf)) {
4176 if (SMB_VFS_STAT(conn, fname, psbuf) != 0) {
4177 return map_nt_error_from_unix(errno);
4181 /* fake a files_struct ptr: */
4183 if (S_ISDIR(psbuf->st_mode)) {
4184 status = open_directory(conn, fname, psbuf,
4185 READ_CONTROL_ACCESS,
4186 FILE_SHARE_READ|FILE_SHARE_WRITE,
4189 FILE_ATTRIBUTE_DIRECTORY,
4193 status = open_file_stat(conn, fname, psbuf, &fsp);
4196 if (!NT_STATUS_IS_OK(status)) {
4197 DEBUG(3, ("Unable to open file %s: %s\n", fname,
4198 nt_errstr(status)));
4202 secdesc_size = SMB_VFS_GET_NT_ACL(fsp, fname,
4203 (OWNER_SECURITY_INFORMATION |
4204 GROUP_SECURITY_INFORMATION |
4205 DACL_SECURITY_INFORMATION),
4207 if (secdesc_size == 0) {
4208 DEBUG(5, ("Unable to get NT ACL for file %s\n", fname));
4209 status = NT_STATUS_ACCESS_DENIED;
4213 *psd = talloc_move(mem_ctx, &secdesc);
4214 status = NT_STATUS_OK;
4217 close_file(fsp, NORMAL_CLOSE);
4221 static BOOL can_access_file_acl(struct connection_struct *conn,
4222 const char * fname, SMB_STRUCT_STAT *psbuf,
4223 uint32_t access_mask)
4227 uint32_t access_granted;
4228 struct security_descriptor_info *secdesc = NULL;
4230 status = conn_get_nt_acl(tmp_talloc_ctx(), conn, fname, psbuf, &secdesc);
4231 if (!NT_STATUS_IS_OK(status)) {
4232 DEBUG(5, ("Could not get acl: %s\n", nt_errstr(status)));
4236 result = se_access_check(secdesc, current_user.nt_user_token,
4237 access_mask, &access_granted, &status);
4238 TALLOC_FREE(secdesc);
4242 /****************************************************************************
4243 Actually emulate the in-kernel access checking for delete access. We need
4244 this to successfully return ACCESS_DENIED on a file open for delete access.
4245 ****************************************************************************/
4247 BOOL can_delete_file_in_directory(connection_struct *conn, const char *fname)
4249 SMB_STRUCT_STAT sbuf;
4252 if (!CAN_WRITE(conn)) {
4256 /* Get the parent directory permission mask and owners. */
4257 pstrcpy(dname, parent_dirname(fname));
4258 if(SMB_VFS_STAT(conn, dname, &sbuf) != 0) {
4262 /* fast paths first */
4264 if (!S_ISDIR(sbuf.st_mode)) {
4267 if (current_user.ut.uid == 0 || conn->admin_user) {
4268 /* I'm sorry sir, I didn't know you were root... */
4272 /* Check primary owner write access. */
4273 if (current_user.ut.uid == sbuf.st_uid) {
4274 return (sbuf.st_mode & S_IWUSR) ? True : False;
4278 /* sticky bit means delete only by owner or root. */
4279 if (sbuf.st_mode & S_ISVTX) {
4280 SMB_STRUCT_STAT sbuf_file;
4281 if(SMB_VFS_STAT(conn, fname, &sbuf_file) != 0) {
4282 if (errno == ENOENT) {
4283 /* If the file doesn't already exist then
4284 * yes we'll be able to delete it. */
4290 * Patch from SATOH Fumiyasu <fumiyas@miraclelinux.com>
4291 * for bug #3348. Don't assume owning sticky bit
4292 * directory means write access allowed.
4294 if (current_user.ut.uid != sbuf_file.st_uid) {
4300 /* now for ACL checks */
4302 return can_access_file_acl(conn, dname, &sbuf, FILE_WRITE_DATA);
4305 /****************************************************************************
4306 Actually emulate the in-kernel access checking for read/write access. We need
4307 this to successfully check for ability to write for dos filetimes.
4308 Note this doesn't take into account share write permissions.
4309 ****************************************************************************/
4311 BOOL can_access_file(connection_struct *conn, const char *fname, SMB_STRUCT_STAT *psbuf, uint32 access_mask)
4313 if (!(access_mask & (FILE_READ_DATA|FILE_WRITE_DATA))) {
4316 access_mask &= (FILE_READ_DATA|FILE_WRITE_DATA);
4318 /* some fast paths first */
4320 DEBUG(10,("can_access_file: requesting 0x%x on file %s\n",
4321 (unsigned int)access_mask, fname ));
4323 if (current_user.ut.uid == 0 || conn->admin_user) {
4324 /* I'm sorry sir, I didn't know you were root... */
4328 if (!VALID_STAT(*psbuf)) {
4329 /* Get the file permission mask and owners. */
4330 if(SMB_VFS_STAT(conn, fname, psbuf) != 0) {
4335 /* Check primary owner access. */
4336 if (current_user.ut.uid == psbuf->st_uid) {
4337 switch (access_mask) {
4338 case FILE_READ_DATA:
4339 return (psbuf->st_mode & S_IRUSR) ? True : False;
4341 case FILE_WRITE_DATA:
4342 return (psbuf->st_mode & S_IWUSR) ? True : False;
4344 default: /* FILE_READ_DATA|FILE_WRITE_DATA */
4346 if ((psbuf->st_mode & (S_IWUSR|S_IRUSR)) == (S_IWUSR|S_IRUSR)) {
4354 /* now for ACL checks */
4356 return can_access_file_acl(conn, fname, psbuf, access_mask);
4359 /****************************************************************************
4360 Userspace check for write access.
4361 Note this doesn't take into account share write permissions.
4362 ****************************************************************************/
4364 BOOL can_write_to_file(connection_struct *conn, const char *fname, SMB_STRUCT_STAT *psbuf)
4366 return can_access_file(conn, fname, psbuf, FILE_WRITE_DATA);
4369 /********************************************************************
4370 Pull the NT ACL from a file on disk or the OpenEventlog() access
4371 check. Caller is responsible for freeing the returned security
4372 descriptor via TALLOC_FREE(). This is designed for dealing with
4373 user space access checks in smbd outside of the VFS. For example,
4374 checking access rights in OpenEventlog().
4376 Assume we are dealing with files (for now)
4377 ********************************************************************/
4379 SEC_DESC* get_nt_acl_no_snum( TALLOC_CTX *ctx, const char *fname)
4381 SEC_DESC *psd, *ret_sd;
4382 connection_struct conn;
4384 struct fd_handle fh;
4388 ZERO_STRUCT( conn );
4390 if ( !(conn.mem_ctx = talloc_init( "novfs_get_nt_acl" )) ) {
4391 DEBUG(0,("get_nt_acl_no_snum: talloc() failed!\n"));
4395 if (!(conn.params = TALLOC_P(conn.mem_ctx, struct share_params))) {
4396 DEBUG(0,("get_nt_acl_no_snum: talloc() failed!\n"));
4397 TALLOC_FREE(conn.mem_ctx);
4401 conn.params->service = -1;
4403 pstrcpy( path, "/" );
4404 set_conn_connectpath(&conn, path);
4406 if (!smbd_vfs_init(&conn)) {
4407 DEBUG(0,("get_nt_acl_no_snum: Unable to create a fake connection struct!\n"));
4408 conn_free_internal( &conn );
4412 ZERO_STRUCT( finfo );
4419 pstrcpy( filename, fname );
4420 finfo.fsp_name = filename;
4422 if (get_nt_acl( &finfo, DACL_SECURITY_INFORMATION, &psd ) == 0) {
4423 DEBUG(0,("get_nt_acl_no_snum: get_nt_acl returned zero.\n"));
4424 conn_free_internal( &conn );
4428 ret_sd = dup_sec_desc( ctx, psd );
4430 conn_free_internal( &conn );