2 Unix SMB/Netbios implementation.
4 SMB NT Security Descriptor / Unix permission conversion.
5 Copyright (C) Jeremy Allison 1994-2000
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 /****************************************************************************
25 Data structures representing the internal ACE format.
26 ****************************************************************************/
28 enum ace_owner {UID_ACE, GID_ACE, WORLD_ACE};
29 enum ace_attribute {ALLOW_ACE, DENY_ACE}; /* Used for incoming NT ACLS. */
31 typedef union posix_id {
37 typedef struct canon_ace {
38 struct canon_ace *next, *prev;
40 mode_t perms; /* Only use S_I(R|W|X)USR mode bits here. */
42 enum ace_owner owner_type;
43 enum ace_attribute attr;
47 #define ALL_ACE_PERMS (S_IRUSR|S_IWUSR|S_IXUSR)
49 /****************************************************************************
50 Functions to manipulate the internal ACE format.
51 ****************************************************************************/
53 /****************************************************************************
54 Count a linked list of canonical ACE entries.
55 ****************************************************************************/
57 static size_t count_canon_ace_list( canon_ace *list_head )
62 for (ace = list_head; ace; ace = ace->next)
68 /****************************************************************************
69 Free a linked list of canonical ACE entries.
70 ****************************************************************************/
72 static void free_canon_ace_list( canon_ace *list_head )
75 canon_ace *old_head = list_head;
76 DLIST_REMOVE(list_head, list_head);
81 /****************************************************************************
82 Function to duplicate a canon_ace entry.
83 ****************************************************************************/
85 static canon_ace *dup_canon_ace( canon_ace *src_ace)
87 canon_ace *dst_ace = (canon_ace *)malloc(sizeof(canon_ace));
93 dst_ace->prev = dst_ace->next = NULL;
97 /****************************************************************************
98 Print out a canon ace.
99 ****************************************************************************/
101 static void print_canon_ace(canon_ace *pace, int num)
105 dbgtext( "canon_ace index %d. Type = %s ", num, pace->attr == ALLOW_ACE ? "allow" : "deny" );
106 dbgtext( "SID = %s ", sid_to_string( str, &pace->sid));
107 if (pace->owner_type == UID_ACE) {
108 struct passwd *pass = sys_getpwuid(pace->unix_ug.uid);
109 dbgtext( "uid %u (%s) ", (unsigned int)pace->unix_ug.uid, pass ? pass->pw_name : "UNKNOWN");
110 } else if (pace->owner_type == GID_ACE) {
111 struct group *grp = getgrgid(pace->unix_ug.gid);
112 dbgtext( "gid %u (%s) ", (unsigned int)pace->unix_ug.gid, grp ? grp->gr_name : "UNKNOWN");
115 switch (pace->type) {
117 dbgtext( "SMB_ACL_USER ");
119 case SMB_ACL_USER_OBJ:
120 dbgtext( "SMB_ACL_USER_OBJ ");
123 dbgtext( "SMB_ACL_GROUP ");
125 case SMB_ACL_GROUP_OBJ:
126 dbgtext( "SMB_ACL_GROUP_OBJ ");
129 dbgtext( "SMB_ACL_OTHER ");
133 dbgtext( "%c", pace->perms & S_IRUSR ? 'r' : '-');
134 dbgtext( "%c", pace->perms & S_IWUSR ? 'w' : '-');
135 dbgtext( "%c\n", pace->perms & S_IXUSR ? 'x' : '-');
138 /****************************************************************************
139 Print out a canon ace list.
140 ****************************************************************************/
142 static void print_canon_ace_list(const char *name, canon_ace *ace_list)
146 if( DEBUGLVL( 10 )) {
147 dbgtext( "print_canon_ace_list: %s\n", name );
148 for (;ace_list; ace_list = ace_list->next, count++)
149 print_canon_ace(ace_list, count );
153 /****************************************************************************
154 Map POSIX ACL perms to canon_ace permissions (a mode_t containing only S_(R|W|X)USR bits).
155 ****************************************************************************/
157 static mode_t convert_permset_to_mode_t(SMB_ACL_PERMSET_T permset)
161 ret |= (sys_acl_get_perm(permset, SMB_ACL_READ) ? S_IRUSR : 0);
162 ret |= (sys_acl_get_perm(permset, SMB_ACL_WRITE) ? S_IWUSR : 0);
163 ret |= (sys_acl_get_perm(permset, SMB_ACL_EXECUTE) ? S_IXUSR : 0);
168 /****************************************************************************
169 Map generic UNIX permissions to canon_ace permissions (a mode_t containing only S_(R|W|X)USR bits).
170 ****************************************************************************/
172 static mode_t unix_perms_to_acl_perms(mode_t mode, int r_mask, int w_mask, int x_mask)
186 /****************************************************************************
187 Map canon_ace permissions (a mode_t containing only S_(R|W|X)USR bits) to
188 an SMB_ACL_PERMSET_T.
189 ****************************************************************************/
191 static int map_acl_perms_to_permset(mode_t mode, SMB_ACL_PERMSET_T *p_permset)
193 if (sys_acl_clear_perms(*p_permset) == -1)
195 if (mode & S_IRUSR) {
196 if (sys_acl_add_perm(*p_permset, SMB_ACL_READ) == -1)
199 if (mode & S_IWUSR) {
200 if (sys_acl_add_perm(*p_permset, SMB_ACL_WRITE) == -1)
203 if (mode & S_IXUSR) {
204 if (sys_acl_add_perm(*p_permset, SMB_ACL_EXECUTE) == -1)
209 /****************************************************************************
210 Function to create owner and group SIDs from a SMB_STRUCT_STAT.
211 ****************************************************************************/
213 static void create_file_sids(SMB_STRUCT_STAT *psbuf, DOM_SID *powner_sid, DOM_SID *pgroup_sid)
215 uid_to_sid( powner_sid, psbuf->st_uid );
216 gid_to_sid( pgroup_sid, psbuf->st_gid );
219 /****************************************************************************
220 Merge aces with a common sid - if both are allow or deny, OR the permissions together and
221 delete the second one. If the first is deny, mask the permissions off and delete the allow
222 if the permissions become zero, delete the deny if the permissions are non zero.
223 ****************************************************************************/
225 static void merge_aces( canon_ace **pp_list_head )
227 canon_ace *list_head = *pp_list_head;
228 canon_ace *curr_ace_outer;
229 canon_ace *curr_ace_outer_next;
232 * First, merge allow entries with identical SIDs, and deny entries
233 * with identical SIDs.
236 for (curr_ace_outer = list_head; curr_ace_outer; curr_ace_outer = curr_ace_outer_next) {
238 canon_ace *curr_ace_next;
240 curr_ace_outer_next = curr_ace_outer->next; /* Save the link in case we delete. */
242 for (curr_ace = curr_ace_outer->next; curr_ace; curr_ace = curr_ace_next) {
244 curr_ace_next = curr_ace->next; /* Save the link in case of delete. */
246 if (sid_equal(&curr_ace->sid, &curr_ace_outer->sid) &&
247 (curr_ace->attr == curr_ace_outer->attr)) {
249 if( DEBUGLVL( 10 )) {
250 dbgtext("merge_aces: Merging ACE's\n");
251 print_canon_ace( curr_ace_outer, 0);
252 print_canon_ace( curr_ace, 0);
255 /* Merge two allow or two deny ACE's. */
257 curr_ace_outer->perms |= curr_ace->perms;
258 DLIST_REMOVE(list_head, curr_ace);
260 curr_ace_outer_next = curr_ace_outer->next; /* We may have deleted the link. */
266 * Now go through and mask off allow permissions with deny permissions.
267 * We can delete either the allow or deny here as we know that each SID
268 * appears only once in the list.
271 for (curr_ace_outer = list_head; curr_ace_outer; curr_ace_outer = curr_ace_outer_next) {
273 canon_ace *curr_ace_next;
275 curr_ace_outer_next = curr_ace_outer->next; /* Save the link in case we delete. */
277 for (curr_ace = curr_ace_outer->next; curr_ace; curr_ace = curr_ace_next) {
279 curr_ace_next = curr_ace->next; /* Save the link in case of delete. */
282 * Subtract ACE's with different entries. Due to the ordering constraints
283 * we've put on the ACL, we know the deny must be the first one.
286 if (sid_equal(&curr_ace->sid, &curr_ace_outer->sid) &&
287 (curr_ace_outer->attr == DENY_ACE) && (curr_ace->attr == ALLOW_ACE)) {
289 if( DEBUGLVL( 10 )) {
290 dbgtext("merge_aces: Masking ACE's\n");
291 print_canon_ace( curr_ace_outer, 0);
292 print_canon_ace( curr_ace, 0);
295 curr_ace->perms &= ~curr_ace_outer->perms;
297 if (curr_ace->perms == 0) {
300 * The deny overrides the allow. Remove the allow.
303 DLIST_REMOVE(list_head, curr_ace);
305 curr_ace_outer_next = curr_ace_outer->next; /* We may have deleted the link. */
310 * Even after removing permissions, there
311 * are still allow permissions - delete the deny.
312 * It is safe to delete the deny here,
313 * as we are guarenteed by the deny first
314 * ordering that all the deny entries for
315 * this SID have already been merged into one
316 * before we can get to an allow ace.
319 DLIST_REMOVE(list_head, curr_ace_outer);
320 SAFE_FREE(curr_ace_outer);
324 } /* end for curr_ace */
325 } /* end for curr_ace_outer */
327 /* We may have modified the list. */
329 *pp_list_head = list_head;
332 /****************************************************************************
333 Map canon_ace perms to permission bits NT.
334 The attr element is not used here - we only process deny entries on set,
335 not get. Deny entries are implicit on get with ace->perms = 0.
336 ****************************************************************************/
338 static SEC_ACCESS map_canon_ace_perms(int *pacl_type, DOM_SID *powner_sid, canon_ace *ace)
343 *pacl_type = SEC_ACE_TYPE_ACCESS_ALLOWED;
345 if ((ace->perms & ALL_ACE_PERMS) == ALL_ACE_PERMS) {
346 nt_mask = UNIX_ACCESS_RWX;
347 } else if ((ace->perms & ALL_ACE_PERMS) == (mode_t)0) {
348 nt_mask = UNIX_ACCESS_NONE;
350 nt_mask |= ((ace->perms & S_IRUSR) ? UNIX_ACCESS_R : 0 );
351 nt_mask |= ((ace->perms & S_IWUSR) ? UNIX_ACCESS_W : 0 );
352 nt_mask |= ((ace->perms & S_IXUSR) ? UNIX_ACCESS_X : 0 );
355 DEBUG(10,("map_canon_ace_perms: Mapped (UNIX) %x to (NT) %x\n",
356 (unsigned int)ace->perms, (unsigned int)nt_mask ));
358 init_sec_access(&sa,nt_mask);
362 /****************************************************************************
363 Map NT perms to a UNIX mode_t.
364 ****************************************************************************/
366 #define FILE_SPECIFIC_READ_BITS (FILE_READ_DATA|FILE_READ_EA|FILE_READ_ATTRIBUTES)
367 #define FILE_SPECIFIC_WRITE_BITS (FILE_WRITE_DATA|FILE_APPEND_DATA|FILE_WRITE_EA|FILE_WRITE_ATTRIBUTES)
368 #define FILE_SPECIFIC_EXECUTE_BITS (FILE_EXECUTE)
370 static mode_t map_nt_perms( SEC_ACCESS sec_access, int type)
376 if(sec_access.mask & GENERIC_ALL_ACCESS)
377 mode = S_IRUSR|S_IWUSR|S_IXUSR;
379 mode |= (sec_access.mask & (GENERIC_READ_ACCESS|FILE_SPECIFIC_READ_BITS)) ? S_IRUSR : 0;
380 mode |= (sec_access.mask & (GENERIC_WRITE_ACCESS|FILE_SPECIFIC_WRITE_BITS)) ? S_IWUSR : 0;
381 mode |= (sec_access.mask & (GENERIC_EXECUTE_ACCESS|FILE_SPECIFIC_EXECUTE_BITS)) ? S_IXUSR : 0;
385 if(sec_access.mask & GENERIC_ALL_ACCESS)
386 mode = S_IRGRP|S_IWGRP|S_IXGRP;
388 mode |= (sec_access.mask & (GENERIC_READ_ACCESS|FILE_SPECIFIC_READ_BITS)) ? S_IRGRP : 0;
389 mode |= (sec_access.mask & (GENERIC_WRITE_ACCESS|FILE_SPECIFIC_WRITE_BITS)) ? S_IWGRP : 0;
390 mode |= (sec_access.mask & (GENERIC_EXECUTE_ACCESS|FILE_SPECIFIC_EXECUTE_BITS)) ? S_IXGRP : 0;
394 if(sec_access.mask & GENERIC_ALL_ACCESS)
395 mode = S_IROTH|S_IWOTH|S_IXOTH;
397 mode |= (sec_access.mask & (GENERIC_READ_ACCESS|FILE_SPECIFIC_READ_BITS)) ? S_IROTH : 0;
398 mode |= (sec_access.mask & (GENERIC_WRITE_ACCESS|FILE_SPECIFIC_WRITE_BITS)) ? S_IWOTH : 0;
399 mode |= (sec_access.mask & (GENERIC_EXECUTE_ACCESS|FILE_SPECIFIC_EXECUTE_BITS)) ? S_IXOTH : 0;
407 /****************************************************************************
408 Unpack a SEC_DESC into a UNIX owner and group.
409 ****************************************************************************/
411 static BOOL unpack_nt_owners(SMB_STRUCT_STAT *psbuf, uid_t *puser, gid_t *pgrp, uint32 security_info_sent, SEC_DESC *psd)
415 enum SID_NAME_USE sid_type;
420 if(security_info_sent == 0) {
421 DEBUG(0,("unpack_nt_owners: no security info sent !\n"));
426 * Validate the owner and group SID's.
429 memset(&owner_sid, '\0', sizeof(owner_sid));
430 memset(&grp_sid, '\0', sizeof(grp_sid));
432 DEBUG(5,("unpack_nt_owners: validating owner_sids.\n"));
435 * Don't immediately fail if the owner sid cannot be validated.
436 * This may be a group chown only set.
439 if (security_info_sent & OWNER_SECURITY_INFORMATION) {
440 sid_copy(&owner_sid, psd->owner_sid);
441 if (!sid_to_uid( &owner_sid, puser, &sid_type)) {
442 DEBUG(3,("unpack_nt_owners: unable to validate owner sid.\n"));
448 * Don't immediately fail if the group sid cannot be validated.
449 * This may be an owner chown only set.
452 if (security_info_sent & GROUP_SECURITY_INFORMATION) {
453 sid_copy(&grp_sid, psd->grp_sid);
454 if (!sid_to_gid( &grp_sid, pgrp, &sid_type)) {
455 DEBUG(3,("unpack_nt_owners: unable to validate group sid.\n"));
460 DEBUG(5,("unpack_nt_owners: owner_sids validated.\n"));
465 /****************************************************************************
466 Ensure the enforced permissions for this share apply.
467 ****************************************************************************/
469 static mode_t apply_default_perms(files_struct *fsp, mode_t perms, mode_t type)
471 int snum = SNUM(fsp->conn);
472 mode_t and_bits = (mode_t)0;
473 mode_t or_bits = (mode_t)0;
475 /* Get the initial bits to apply. */
477 if (fsp->is_directory) {
478 and_bits = lp_dir_security_mask(snum);
479 or_bits = lp_force_dir_security_mode(snum);
481 and_bits = lp_security_mask(snum);
482 or_bits = lp_force_security_mode(snum);
485 /* Now bounce them into the S_USR space. */
488 and_bits = unix_perms_to_acl_perms(and_bits, S_IRUSR, S_IWUSR, S_IXUSR);
489 or_bits = unix_perms_to_acl_perms(or_bits, S_IRUSR, S_IWUSR, S_IXUSR);
492 and_bits = unix_perms_to_acl_perms(and_bits, S_IRGRP, S_IWGRP, S_IXGRP);
493 or_bits = unix_perms_to_acl_perms(or_bits, S_IRGRP, S_IWGRP, S_IXGRP);
496 and_bits = unix_perms_to_acl_perms(and_bits, S_IROTH, S_IWOTH, S_IXOTH);
497 or_bits = unix_perms_to_acl_perms(or_bits, S_IROTH, S_IWOTH, S_IXOTH);
501 return ((perms & and_bits)|or_bits);
504 /****************************************************************************
505 A well formed POSIX file or default ACL has at least 3 entries, a
506 SMB_ACL_USER_OBJ, SMB_ACL_GROUP_OBJ, SMB_ACL_OTHER_OBJ.
507 In addition, the owner must always have at least read access.
508 When using this call on get_acl, the pst struct is valid and contains
509 the mode of the file. When using this call on set_acl, the pst struct has
510 been modified to have a mode containing the default for this file or directory
512 ****************************************************************************/
514 static BOOL ensure_canon_entry_valid(canon_ace **pp_ace,
516 DOM_SID *pfile_owner_sid,
517 DOM_SID *pfile_grp_sid,
518 SMB_STRUCT_STAT *pst,
521 extern DOM_SID global_sid_World;
523 BOOL got_user = False;
524 BOOL got_grp = False;
525 BOOL got_other = False;
527 for (pace = *pp_ace; pace; pace = pace->next) {
528 if (pace->type == SMB_ACL_USER_OBJ) {
531 /* Ensure owner has read access. */
532 pace->perms |= S_IRUSR;
533 if (fsp->is_directory)
534 pace->perms |= (S_IWUSR|S_IXUSR);
537 * Ensure create mask/force create mode is respected on set.
540 pace->perms = apply_default_perms(fsp, pace->perms, S_IRUSR);
544 } else if (pace->type == SMB_ACL_GROUP_OBJ) {
547 * Ensure create mask/force create mode is respected on set.
551 pace->perms = apply_default_perms(fsp, pace->perms, S_IRGRP);
553 } else if (pace->type == SMB_ACL_OTHER) {
556 * Ensure create mask/force create mode is respected on set.
560 pace->perms = apply_default_perms(fsp, pace->perms, S_IROTH);
566 if ((pace = (canon_ace *)malloc(sizeof(canon_ace))) == NULL) {
567 DEBUG(0,("ensure_canon_entry_valid: malloc fail.\n"));
572 pace->type = SMB_ACL_USER_OBJ;
573 pace->owner_type = UID_ACE;
574 pace->unix_ug.uid = pst->st_uid;
575 pace->sid = *pfile_owner_sid;
576 pace->perms = unix_perms_to_acl_perms(pst->st_mode, S_IRUSR, S_IWUSR, S_IXUSR);
577 pace->attr = ALLOW_ACE;
579 DLIST_ADD(*pp_ace, pace);
583 if ((pace = (canon_ace *)malloc(sizeof(canon_ace))) == NULL) {
584 DEBUG(0,("ensure_canon_entry_valid: malloc fail.\n"));
589 pace->type = SMB_ACL_GROUP_OBJ;
590 pace->owner_type = GID_ACE;
591 pace->unix_ug.uid = pst->st_gid;
592 pace->sid = *pfile_grp_sid;
593 pace->perms = unix_perms_to_acl_perms(pst->st_mode, S_IRGRP, S_IWGRP, S_IXGRP);
594 pace->attr = ALLOW_ACE;
596 DLIST_ADD(*pp_ace, pace);
600 if ((pace = (canon_ace *)malloc(sizeof(canon_ace))) == NULL) {
601 DEBUG(0,("ensure_canon_entry_valid: malloc fail.\n"));
606 pace->type = SMB_ACL_OTHER;
607 pace->owner_type = WORLD_ACE;
608 pace->unix_ug.world = -1;
609 pace->sid = global_sid_World;
610 pace->perms = unix_perms_to_acl_perms(pst->st_mode, S_IROTH, S_IWOTH, S_IXOTH);
611 pace->attr = ALLOW_ACE;
613 DLIST_ADD(*pp_ace, pace);
619 /****************************************************************************
620 Unpack a SEC_DESC into two canonical ace lists.
621 ****************************************************************************/
623 static BOOL create_canon_ace_lists(files_struct *fsp,
624 DOM_SID *pfile_owner_sid,
625 DOM_SID *pfile_grp_sid,
626 canon_ace **ppfile_ace, canon_ace **ppdir_ace,
629 extern DOM_SID global_sid_World;
630 extern struct generic_mapping file_generic_mapping;
631 BOOL all_aces_are_inherit_only = (fsp->is_directory ? True : False);
632 canon_ace *file_ace = NULL;
633 canon_ace *dir_ace = NULL;
634 canon_ace *tmp_ace = NULL;
635 canon_ace *current_ace = NULL;
636 BOOL got_dir_allow = False;
637 BOOL got_file_allow = False;
644 * Convert the incoming ACL into a more regular form.
647 for(i = 0; i < dacl->num_aces; i++) {
648 SEC_ACE *psa = &dacl->ace[i];
650 if((psa->type != SEC_ACE_TYPE_ACCESS_ALLOWED) && (psa->type != SEC_ACE_TYPE_ACCESS_DENIED)) {
651 DEBUG(3,("create_canon_ace_lists: unable to set anything but an ALLOW or DENY ACE.\n"));
656 * The security mask may be UNIX_ACCESS_NONE which should map into
657 * no permissions (we overload the WRITE_OWNER bit for this) or it
658 * should be one of the ALL/EXECUTE/READ/WRITE bits. Arrange for this
659 * to be so. Any other bits override the UNIX_ACCESS_NONE bit.
663 * Convert GENERIC bits to specific bits.
666 se_map_generic(&psa->info.mask, &file_generic_mapping);
668 psa->info.mask &= (UNIX_ACCESS_NONE|FILE_ALL_ACCESS);
670 if(psa->info.mask != UNIX_ACCESS_NONE)
671 psa->info.mask &= ~UNIX_ACCESS_NONE;
675 * Deal with the fact that NT 4.x re-writes the canonical format
676 * that we return for default ACLs. If a directory ACE is identical
677 * to a inherited directory ACE then NT changes the bits so that the
678 * first ACE is set to OI|IO and the second ACE for this SID is set
679 * to CI. We need to repair this. JRA.
682 for(i = 0; i < dacl->num_aces; i++) {
683 SEC_ACE *psa1 = &dacl->ace[i];
685 for (j = i + 1; j < dacl->num_aces; j++) {
686 SEC_ACE *psa2 = &dacl->ace[j];
688 if (psa1->info.mask != psa2->info.mask)
691 if (!sid_equal(&psa1->sid, &psa2->sid))
695 * Ok - permission bits and SIDs are equal.
696 * Check if flags were re-written.
699 if (psa1->flags & SEC_ACE_FLAG_INHERIT_ONLY) {
701 psa1->flags |= (psa2->flags & (SEC_ACE_FLAG_CONTAINER_INHERIT|SEC_ACE_FLAG_OBJECT_INHERIT));
702 psa2->flags &= ~(SEC_ACE_FLAG_CONTAINER_INHERIT|SEC_ACE_FLAG_OBJECT_INHERIT);
704 } else if (psa2->flags & SEC_ACE_FLAG_INHERIT_ONLY) {
706 psa2->flags |= (psa1->flags & (SEC_ACE_FLAG_CONTAINER_INHERIT|SEC_ACE_FLAG_OBJECT_INHERIT));
707 psa1->flags &= ~(SEC_ACE_FLAG_CONTAINER_INHERIT|SEC_ACE_FLAG_OBJECT_INHERIT);
713 for(i = 0; i < dacl->num_aces; i++) {
714 enum SID_NAME_USE sid_type;
715 SEC_ACE *psa = &dacl->ace[i];
718 * Create a cannon_ace entry representing this NT DACL ACE.
721 if ((current_ace = (canon_ace *)malloc(sizeof(canon_ace))) == NULL) {
722 free_canon_ace_list(file_ace);
723 free_canon_ace_list(dir_ace);
724 DEBUG(0,("create_canon_ace_lists: malloc fail.\n"));
728 ZERO_STRUCTP(current_ace);
730 sid_copy(¤t_ace->sid, &psa->sid);
733 * Try and work out if the SID is a user or group
734 * as we need to flag these differently for POSIX.
737 if( sid_equal(¤t_ace->sid, &global_sid_World)) {
738 current_ace->owner_type = WORLD_ACE;
739 current_ace->unix_ug.world = -1;
740 } else if (sid_to_uid( ¤t_ace->sid, ¤t_ace->unix_ug.uid, &sid_type)) {
741 current_ace->owner_type = UID_ACE;
742 } else if (sid_to_gid( ¤t_ace->sid, ¤t_ace->unix_ug.gid, &sid_type)) {
743 current_ace->owner_type = GID_ACE;
747 free_canon_ace_list(file_ace);
748 free_canon_ace_list(dir_ace);
749 SAFE_FREE(current_ace);
750 DEBUG(0,("create_canon_ace_lists: unable to map SID %s to uid or gid.\n",
751 sid_to_string(str, ¤t_ace->sid) ));
756 * Map the given NT permissions into a UNIX mode_t containing only
757 * S_I(R|W|X)USR bits.
760 current_ace->perms |= map_nt_perms( psa->info, S_IRUSR);
761 current_ace->attr = (psa->type == SEC_ACE_TYPE_ACCESS_ALLOWED) ? ALLOW_ACE : DENY_ACE;
764 * Now note what kind of a POSIX ACL this should map to.
767 if(sid_equal(¤t_ace->sid, pfile_owner_sid)) {
769 current_ace->type = SMB_ACL_USER_OBJ;
771 } else if( sid_equal(¤t_ace->sid, pfile_grp_sid)) {
773 current_ace->type = SMB_ACL_GROUP_OBJ;
775 } else if( sid_equal(¤t_ace->sid, &global_sid_World)) {
777 current_ace->type = SMB_ACL_OTHER;
781 * Could be a SMB_ACL_USER or SMB_ACL_GROUP. Check by
782 * looking at owner_type.
785 current_ace->type = (current_ace->owner_type == UID_ACE) ? SMB_ACL_USER : SMB_ACL_GROUP;
789 * Now add the created ace to either the file list, the directory
790 * list, or both. We *MUST* preserve the order here (hence we use
791 * DLIST_ADD_END) as NT ACLs are order dependent.
794 if (fsp->is_directory) {
797 * We can only add to the default POSIX ACE list if the ACE is
798 * designed to be inherited by both files and directories.
801 if ((psa->flags & (SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT)) ==
802 (SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT)) {
804 DLIST_ADD_END(dir_ace, current_ace, tmp_ace);
807 * Note if this was an allow ace. We can't process
808 * any further deny ace's after this.
811 if (current_ace->attr == ALLOW_ACE)
812 got_dir_allow = True;
814 if ((current_ace->attr == DENY_ACE) && got_dir_allow) {
815 DEBUG(0,("create_canon_ace_lists: malformed ACL in inheritable ACL ! \
816 Deny entry after Allow entry. Failing to set on file %s.\n", fsp->fsp_name ));
817 free_canon_ace_list(file_ace);
818 free_canon_ace_list(dir_ace);
819 SAFE_FREE(current_ace);
823 if( DEBUGLVL( 10 )) {
824 dbgtext("create_canon_ace_lists: adding dir ACL:\n");
825 print_canon_ace( current_ace, 0);
829 * If this is not an inherit only ACE we need to add a duplicate
833 if (!(psa->flags & SEC_ACE_FLAG_INHERIT_ONLY)) {
834 canon_ace *dup_ace = dup_canon_ace(current_ace);
837 DEBUG(0,("create_canon_ace_lists: malloc fail !\n"));
838 free_canon_ace_list(file_ace);
839 free_canon_ace_list(dir_ace);
843 current_ace = dup_ace;
851 * Only add to the file ACL if not inherit only.
854 if (!(psa->flags & SEC_ACE_FLAG_INHERIT_ONLY)) {
855 DLIST_ADD_END(file_ace, current_ace, tmp_ace);
858 * Note if this was an allow ace. We can't process
859 * any further deny ace's after this.
862 if (current_ace->attr == ALLOW_ACE)
863 got_file_allow = True;
865 if ((current_ace->attr == DENY_ACE) && got_file_allow) {
866 DEBUG(0,("create_canon_ace_lists: malformed ACL in file ACL ! \
867 Deny entry after Allow entry. Failing to set on file %s.\n", fsp->fsp_name ));
868 free_canon_ace_list(file_ace);
869 free_canon_ace_list(dir_ace);
870 SAFE_FREE(current_ace);
874 if( DEBUGLVL( 10 )) {
875 dbgtext("create_canon_ace_lists: adding file ACL:\n");
876 print_canon_ace( current_ace, 0);
878 all_aces_are_inherit_only = False;
883 * Free if ACE was not added.
886 SAFE_FREE(current_ace);
889 if (fsp->is_directory && all_aces_are_inherit_only) {
891 * Windows 2000 is doing one of these weird 'inherit acl'
892 * traverses to conserve NTFS ACL resources. Just pretend
893 * there was no DACL sent. JRA.
896 DEBUG(10,("create_canon_ace_lists: Win2k inherit acl traverse. Ignoring DACL.\n"));
897 free_canon_ace_list(file_ace);
898 free_canon_ace_list(dir_ace);
903 *ppfile_ace = file_ace;
904 *ppdir_ace = dir_ace;
909 /****************************************************************************
910 Check if a given uid/SID is in a group gid/SID. This is probably very
911 expensive and will need optimisation. A *lot* of optimisation :-). JRA.
912 ****************************************************************************/
914 static BOOL uid_entry_in_group( canon_ace *uid_ace, canon_ace *group_ace )
916 extern DOM_SID global_sid_World;
917 struct passwd *pass = NULL;
918 struct group *gptr = NULL;
920 /* "Everyone" always matches every uid. */
922 if (sid_equal(&group_ace->sid, &global_sid_World))
925 if (!(pass = sys_getpwuid(uid_ace->unix_ug.uid)))
928 if (!(gptr = getgrgid(group_ace->unix_ug.gid)))
932 * Due to the winbind interfaces we need to do this via names,
936 return user_in_group_list(pass->pw_name, gptr->gr_name );
939 /****************************************************************************
940 ASCII art time again... JRA :-).
942 We have 3 cases to process when moving from an NT ACL to a POSIX ACL. Firstly,
943 we insist the ACL is in canonical form (ie. all DENY entries preceede ALLOW
944 entries). Secondly, the merge code has ensured that all duplicate SID entries for
945 allow or deny have been merged, so the same SID can only appear once in the deny
946 list or once in the allow list.
948 We then process as follows :
950 ---------------------------------------------------------------------------
951 First pass - look for a Everyone DENY entry.
953 If it is deny all (rwx) trunate the list at this point.
954 Else, walk the list from this point and use the deny permissions of this
955 entry as a mask on all following allow entries. Finally, delete
956 the Everyone DENY entry (we have applied it to everything possible).
958 In addition, in this pass we remove any DENY entries that have
959 no permissions (ie. they are a DENY nothing).
960 ---------------------------------------------------------------------------
961 Second pass - only deal with deny user entries.
963 DENY user1 (perms XXX)
966 for all following allow group entries where user1 is in group
967 new_perms |= group_perms;
969 user1 entry perms = new_perms & ~ XXX;
971 Convert the deny entry to an allow entry with the new perms and
972 push to the end of the list. Note if the user was in no groups
973 this maps to a specific allow nothing entry for this user.
975 The common case from the NT ACL choser (userX deny all) is
976 optimised so we don't do the group lookup - we just map to
977 an allow nothing entry.
979 What we're doing here is inferring the allow permissions the
980 person setting the ACE on user1 wanted by looking at the allow
981 permissions on the groups the user is currently in. This will
982 be a snapshot, depending on group membership but is the best
983 we can do and has the advantage of failing closed rather than
985 ---------------------------------------------------------------------------
986 Third pass - only deal with deny group entries.
988 DENY group1 (perms XXX)
990 for all following allow user entries where user is in group1
991 user entry perms = user entry perms & ~ XXX;
993 If there is a group Everyone allow entry with permissions YYY,
994 convert the group1 entry to an allow entry and modify its
997 new_perms = YYY & ~ XXX
999 and push to the end of the list.
1001 If there is no group Everyone allow entry then convert the
1002 group1 entry to a allow nothing entry and push to the end of the list.
1004 Note that the common case from the NT ACL choser (groupX deny all)
1005 cannot be optimised here as we need to modify user entries who are
1006 in the group to change them to a deny all also.
1008 What we're doing here is modifying the allow permissions of
1009 user entries (which are more specific in POSIX ACLs) to mask
1010 out the explicit deny set on the group they are in. This will
1011 be a snapshot depending on current group membership but is the
1012 best we can do and has the advantage of failing closed rather
1014 ---------------------------------------------------------------------------
1016 Note we *MUST* do the deny user pass first as this will convert deny user
1017 entries into allow user entries which can then be processed by the deny
1020 The above algorithm took a *lot* of thinking about - hence this
1021 explaination :-). JRA.
1022 ****************************************************************************/
1024 /****************************************************************************
1025 Process a canon_ace list entries. This is very complex code. We need
1026 to go through and remove the "deny" permissions from any allow entry that matches
1027 the id of this entry. We have already refused any NT ACL that wasn't in correct
1028 order (DENY followed by ALLOW). If any allow entry ends up with zero permissions,
1029 we just remove it (to fail safe). We have already removed any duplicate ace
1030 entries. Treat an "Everyone" DENY_ACE as a special case - use it to mask all
1032 ****************************************************************************/
1034 static void process_deny_list( canon_ace **pp_ace_list )
1036 extern DOM_SID global_sid_World;
1037 canon_ace *ace_list = *pp_ace_list;
1038 canon_ace *curr_ace = NULL;
1039 canon_ace *curr_ace_next = NULL;
1041 /* Pass 1 above - look for an Everyone, deny entry. */
1043 for (curr_ace = ace_list; curr_ace; curr_ace = curr_ace_next) {
1044 canon_ace *allow_ace_p;
1046 curr_ace_next = curr_ace->next; /* So we can't lose the link. */
1048 if (curr_ace->attr != DENY_ACE)
1051 if (curr_ace->perms == (mode_t)0) {
1053 /* Deny nothing entry - delete. */
1055 DLIST_REMOVE(ace_list, curr_ace);
1059 if (!sid_equal(&curr_ace->sid, &global_sid_World))
1062 /* JRATEST - assert. */
1063 SMB_ASSERT(curr_ace->owner_type == WORLD_ACE);
1065 if (curr_ace->perms == ALL_ACE_PERMS) {
1068 * Optimisation. This is a DENY_ALL to Everyone. Truncate the
1069 * list at this point including this entry.
1072 canon_ace *prev_entry = curr_ace->prev;
1074 free_canon_ace_list( curr_ace );
1076 prev_entry->next = NULL;
1078 /* We deleted the entire list. */
1084 for (allow_ace_p = curr_ace->next; allow_ace_p; allow_ace_p = allow_ace_p->next) {
1087 * Only mask off allow entries.
1090 if (allow_ace_p->attr != ALLOW_ACE)
1093 allow_ace_p->perms &= ~curr_ace->perms;
1097 * Now it's been applied, remove it.
1100 DLIST_REMOVE(ace_list, curr_ace);
1103 /* Pass 2 above - deal with deny user entries. */
1105 for (curr_ace = ace_list; curr_ace; curr_ace = curr_ace_next) {
1106 mode_t new_perms = (mode_t)0;
1107 canon_ace *allow_ace_p;
1110 curr_ace_next = curr_ace->next; /* So we can't lose the link. */
1112 if (curr_ace->attr != DENY_ACE)
1115 if (curr_ace->owner_type != UID_ACE)
1118 if (curr_ace->perms == ALL_ACE_PERMS) {
1121 * Optimisation - this is a deny everything to this user.
1122 * Convert to an allow nothing and push to the end of the list.
1125 curr_ace->attr = ALLOW_ACE;
1126 curr_ace->perms = (mode_t)0;
1127 DLIST_DEMOTE(ace_list, curr_ace, tmp_ace);
1131 for (allow_ace_p = curr_ace->next; allow_ace_p; allow_ace_p = allow_ace_p->next) {
1133 if (allow_ace_p->attr != ALLOW_ACE)
1136 /* We process GID_ACE and WORLD_ACE entries only. */
1138 if (allow_ace_p->owner_type == UID_ACE)
1141 if (uid_entry_in_group( curr_ace, allow_ace_p))
1142 new_perms |= allow_ace_p->perms;
1146 * Convert to a allow entry, modify the perms and push to the end
1150 curr_ace->attr = ALLOW_ACE;
1151 curr_ace->perms = (new_perms & ~curr_ace->perms);
1152 DLIST_DEMOTE(ace_list, curr_ace, tmp_ace);
1155 /* Pass 3 above - deal with deny group entries. */
1157 for (curr_ace = ace_list; curr_ace; curr_ace = curr_ace_next) {
1159 canon_ace *allow_ace_p;
1160 canon_ace *allow_everyone_p = NULL;
1162 curr_ace_next = curr_ace->next; /* So we can't lose the link. */
1164 if (curr_ace->attr != DENY_ACE)
1167 if (curr_ace->owner_type != GID_ACE)
1170 for (allow_ace_p = curr_ace->next; allow_ace_p; allow_ace_p = allow_ace_p->next) {
1172 if (allow_ace_p->attr != ALLOW_ACE)
1175 /* Store a pointer to the Everyone allow, if it exists. */
1176 if (allow_ace_p->owner_type == WORLD_ACE)
1177 allow_everyone_p = allow_ace_p;
1179 /* We process UID_ACE entries only. */
1181 if (allow_ace_p->owner_type != UID_ACE)
1184 /* Mask off the deny group perms. */
1186 if (uid_entry_in_group( allow_ace_p, curr_ace))
1187 allow_ace_p->perms &= ~curr_ace->perms;
1191 * Convert the deny to an allow with the correct perms and
1192 * push to the end of the list.
1195 curr_ace->attr = ALLOW_ACE;
1196 if (allow_everyone_p)
1197 curr_ace->perms = allow_everyone_p->perms & ~curr_ace->perms;
1199 curr_ace->perms = (mode_t)0;
1200 DLIST_DEMOTE(ace_list, curr_ace, tmp_ace);
1204 *pp_ace_list = ace_list;
1207 /****************************************************************************
1208 Create a default mode that will be used if a security descriptor entry has
1209 no user/group/world entries.
1210 ****************************************************************************/
1212 static mode_t create_default_mode(files_struct *fsp, BOOL interitable_mode)
1214 int snum = SNUM(fsp->conn);
1215 mode_t and_bits = (mode_t)0;
1216 mode_t or_bits = (mode_t)0;
1217 mode_t mode = interitable_mode ? unix_mode( fsp->conn, FILE_ATTRIBUTE_ARCHIVE, fsp->fsp_name) : S_IRUSR;
1219 if (fsp->is_directory)
1220 mode |= (S_IWUSR|S_IXUSR);
1223 * Now AND with the create mode/directory mode bits then OR with the
1224 * force create mode/force directory mode bits.
1227 if (fsp->is_directory) {
1228 and_bits = lp_dir_security_mask(snum);
1229 or_bits = lp_force_dir_security_mode(snum);
1231 and_bits = lp_security_mask(snum);
1232 or_bits = lp_force_security_mode(snum);
1235 return ((mode & and_bits)|or_bits);
1238 /****************************************************************************
1239 Unpack a SEC_DESC into two canonical ace lists. We don't depend on this
1241 ****************************************************************************/
1243 static BOOL unpack_canon_ace(files_struct *fsp,
1244 SMB_STRUCT_STAT *pst,
1245 DOM_SID *pfile_owner_sid,
1246 DOM_SID *pfile_grp_sid,
1247 canon_ace **ppfile_ace, canon_ace **ppdir_ace,
1248 uint32 security_info_sent, SEC_DESC *psd)
1250 canon_ace *file_ace = NULL;
1251 canon_ace *dir_ace = NULL;
1256 if(security_info_sent == 0) {
1257 DEBUG(0,("unpack_canon_ace: no security info sent !\n"));
1262 * If no DACL then this is a chown only security descriptor.
1265 if(!(security_info_sent & DACL_SECURITY_INFORMATION) || !psd->dacl)
1269 * Now go through the DACL and create the canon_ace lists.
1272 if (!create_canon_ace_lists( fsp, pfile_owner_sid, pfile_grp_sid,
1273 &file_ace, &dir_ace, psd->dacl))
1276 if ((file_ace == NULL) && (dir_ace == NULL)) {
1277 /* W2K traverse DACL set - ignore. */
1282 * Go through the canon_ace list and merge entries
1283 * belonging to identical users of identical allow or deny type.
1284 * We can do this as all deny entries come first, followed by
1285 * all allow entries (we have mandated this before accepting this acl).
1288 print_canon_ace_list( "file ace - before merge", file_ace);
1289 merge_aces( &file_ace );
1291 print_canon_ace_list( "dir ace - before merge", dir_ace);
1292 merge_aces( &dir_ace );
1295 * NT ACLs are order dependent. Go through the acl lists and
1296 * process DENY entries by masking the allow entries.
1299 print_canon_ace_list( "file ace - before deny", file_ace);
1300 process_deny_list( &file_ace);
1302 print_canon_ace_list( "dir ace - before deny", dir_ace);
1303 process_deny_list( &dir_ace);
1306 * A well formed POSIX file or default ACL has at least 3 entries, a
1307 * SMB_ACL_USER_OBJ, SMB_ACL_GROUP_OBJ, SMB_ACL_OTHER_OBJ
1308 * and optionally a mask entry. Ensure this is the case.
1311 print_canon_ace_list( "file ace - before valid", file_ace);
1314 * A default 3 element mode entry for a file should be r-- --- ---.
1315 * A default 3 element mode entry for a directory should be rwx --- ---.
1318 pst->st_mode = create_default_mode(fsp, False);
1320 if (!ensure_canon_entry_valid(&file_ace, fsp, pfile_owner_sid, pfile_grp_sid, pst, True)) {
1321 free_canon_ace_list(file_ace);
1322 free_canon_ace_list(dir_ace);
1326 print_canon_ace_list( "dir ace - before valid", dir_ace);
1329 * A default inheritable 3 element mode entry for a directory should be the
1330 * mode Samba will use to create a file within. Ensure user rwx bits are set if
1334 pst->st_mode = create_default_mode(fsp, True);
1336 if (!ensure_canon_entry_valid(&dir_ace, fsp, pfile_owner_sid, pfile_grp_sid, pst, True)) {
1337 free_canon_ace_list(file_ace);
1338 free_canon_ace_list(dir_ace);
1342 print_canon_ace_list( "file ace - return", file_ace);
1343 print_canon_ace_list( "dir ace - return", dir_ace);
1345 *ppfile_ace = file_ace;
1346 *ppdir_ace = dir_ace;
1351 /******************************************************************************
1352 When returning permissions, try and fit NT display
1353 semantics if possible. Note the the canon_entries here must have been malloced.
1354 The list format should be - first entry = owner, followed by group and other user
1355 entries, last entry = other.
1357 Note that this doesn't exactly match the NT semantics for an ACL. As POSIX entries
1358 are not ordered, and match on the most specific entry rather than walking a list,
1359 then a simple POSIX permission of rw-r--r-- should really map to 6 entries,
1361 Entry 0: owner : deny all except read and write.
1362 Entry 1: group : deny all except read.
1363 Entry 2: Everyone : deny all except read.
1364 Entry 3: owner : allow read and write.
1365 Entry 4: group : allow read.
1366 Entry 5: Everyone : allow read.
1368 But NT cannot display this in their ACL editor !
1369 ********************************************************************************/
1371 static void arrange_posix_perms( char *filename, canon_ace **pp_list_head)
1373 canon_ace *list_head = *pp_list_head;
1374 canon_ace *owner_ace = NULL;
1375 canon_ace *other_ace = NULL;
1376 canon_ace *ace = NULL;
1378 for (ace = list_head; ace; ace = ace->next) {
1379 if (ace->type == SMB_ACL_USER_OBJ)
1381 else if (ace->type == SMB_ACL_OTHER) {
1382 /* Last ace - this is "other" */
1387 if (!owner_ace || !other_ace) {
1388 DEBUG(0,("arrange_posix_perms: Invalid POSIX permissions for file %s, missing owner or other.\n",
1394 * The POSIX algorithm applies to owner first, and other last,
1395 * so ensure they are arranged in this order.
1399 DLIST_PROMOTE(list_head, owner_ace);
1403 DLIST_DEMOTE(list_head, other_ace, ace);
1406 /* We have probably changed the head of the list. */
1408 *pp_list_head = list_head;
1411 /****************************************************************************
1412 Create a linked list of canonical ACE entries.
1413 ****************************************************************************/
1415 static canon_ace *canonicalise_acl( files_struct *fsp, SMB_ACL_T posix_acl, SMB_STRUCT_STAT *psbuf,
1416 DOM_SID *powner, DOM_SID *pgroup)
1418 extern DOM_SID global_sid_World;
1419 mode_t acl_mask = (S_IRUSR|S_IWUSR|S_IXUSR);
1420 canon_ace *list_head = NULL;
1421 canon_ace *ace = NULL;
1422 canon_ace *next_ace = NULL;
1423 int entry_id = SMB_ACL_FIRST_ENTRY;
1424 SMB_ACL_ENTRY_T entry;
1427 while ( posix_acl && (sys_acl_get_entry(posix_acl, entry_id, &entry) == 1)) {
1428 SMB_ACL_TAG_T tagtype;
1429 SMB_ACL_PERMSET_T permset;
1432 enum ace_owner owner_type;
1435 if (entry_id == SMB_ACL_FIRST_ENTRY)
1436 entry_id = SMB_ACL_NEXT_ENTRY;
1438 /* Is this a MASK entry ? */
1439 if (sys_acl_get_tag_type(entry, &tagtype) == -1)
1442 if (sys_acl_get_permset(entry, &permset) == -1)
1445 /* Decide which SID to use based on the ACL type. */
1447 case SMB_ACL_USER_OBJ:
1448 /* Get the SID from the owner. */
1449 uid_to_sid( &sid, psbuf->st_uid );
1450 unix_ug.uid = psbuf->st_uid;
1451 owner_type = UID_ACE;
1455 uid_t *puid = (uid_t *)sys_acl_get_qualifier(entry);
1457 DEBUG(0,("canonicalise_acl: Failed to get uid.\n"));
1460 uid_to_sid( &sid, *puid);
1461 unix_ug.uid = *puid;
1462 owner_type = UID_ACE;
1463 sys_acl_free_qualifier((void *)puid,tagtype);
1466 case SMB_ACL_GROUP_OBJ:
1467 /* Get the SID from the owning group. */
1468 gid_to_sid( &sid, psbuf->st_gid );
1469 unix_ug.gid = psbuf->st_gid;
1470 owner_type = GID_ACE;
1474 gid_t *pgid = (gid_t *)sys_acl_get_qualifier(entry);
1476 DEBUG(0,("canonicalise_acl: Failed to get gid.\n"));
1479 gid_to_sid( &sid, *pgid);
1480 unix_ug.gid = *pgid;
1481 owner_type = GID_ACE;
1482 sys_acl_free_qualifier((void *)pgid,tagtype);
1486 acl_mask = convert_permset_to_mode_t(permset);
1487 continue; /* Don't count the mask as an entry. */
1489 /* Use the Everyone SID */
1490 sid = global_sid_World;
1492 owner_type = WORLD_ACE;
1495 DEBUG(0,("canonicalise_acl: Unknown tagtype %u\n", (unsigned int)tagtype));
1500 * Add this entry to the list.
1503 if ((ace = (canon_ace *)malloc(sizeof(canon_ace))) == NULL)
1507 ace->type = tagtype;
1508 ace->perms = convert_permset_to_mode_t(permset);
1509 ace->attr = ALLOW_ACE;
1511 ace->unix_ug = unix_ug;
1512 ace->owner_type = owner_type;
1514 DLIST_ADD(list_head, ace);
1518 * This next call will ensure we have at least a user/group/world set.
1521 if (!ensure_canon_entry_valid(&list_head, fsp, powner, pgroup, psbuf, False))
1524 arrange_posix_perms(fsp->fsp_name,&list_head );
1527 * Now go through the list, masking the permissions with the
1528 * acl_mask. Ensure all DENY Entries are at the start of the list.
1531 DEBUG(10,("canonicalise_acl: ace entries before arrange :\n"));
1533 for ( ace_count = 0, ace = list_head; ace; ace = next_ace, ace_count++) {
1534 next_ace = ace->next;
1536 /* Masks are only applied to entries other than USER_OBJ and OTHER. */
1537 if (ace->type != SMB_ACL_OTHER && ace->type != SMB_ACL_USER_OBJ)
1538 ace->perms &= acl_mask;
1540 if (ace->perms == 0) {
1541 DLIST_PROMOTE(list_head, ace);
1544 if( DEBUGLVL( 10 ) ) {
1545 print_canon_ace(ace, ace_count);
1549 print_canon_ace_list( "canonicalise_acl: ace entries after arrange", list_head );
1555 free_canon_ace_list(list_head);
1559 /****************************************************************************
1560 Attempt to apply an ACL to a file or directory.
1561 ****************************************************************************/
1563 static BOOL set_canon_ace_list(files_struct *fsp, canon_ace *the_ace, BOOL default_ace, BOOL *pacl_set_support)
1566 SMB_ACL_T the_acl = sys_acl_init((int)count_canon_ace_list(the_ace) + 1);
1569 SMB_ACL_ENTRY_T mask_entry;
1570 SMB_ACL_PERMSET_T mask_permset;
1571 SMB_ACL_TYPE_T the_acl_type = (default_ace ? SMB_ACL_TYPE_DEFAULT : SMB_ACL_TYPE_ACCESS);
1573 if (the_acl == NULL) {
1575 if (errno != ENOSYS) {
1577 * Only print this error message if we have some kind of ACL
1578 * support that's not working. Otherwise we would always get this.
1580 DEBUG(0,("set_canon_ace_list: Unable to init %s ACL. (%s)\n",
1581 default_ace ? "default" : "file", strerror(errno) ));
1583 *pacl_set_support = False;
1587 for (i = 0, p_ace = the_ace; p_ace; p_ace = p_ace->next, i++ ) {
1588 SMB_ACL_ENTRY_T the_entry;
1589 SMB_ACL_PERMSET_T the_permset;
1592 * Get the entry for this ACE.
1595 if (sys_acl_create_entry( &the_acl, &the_entry) == -1) {
1596 DEBUG(0,("set_canon_ace_list: Failed to create entry %d. (%s)\n",
1597 i, strerror(errno) ));
1602 * Ok - we now know the ACL calls should be working, don't
1603 * allow fallback to chmod.
1606 *pacl_set_support = True;
1609 * Initialise the entry from the canon_ace.
1613 * First tell the entry what type of ACE this is.
1616 if (sys_acl_set_tag_type(the_entry, p_ace->type) == -1) {
1617 DEBUG(0,("set_canon_ace_list: Failed to set tag type on entry %d. (%s)\n",
1618 i, strerror(errno) ));
1623 * Only set the qualifier (user or group id) if the entry is a user
1627 if ((p_ace->type == SMB_ACL_USER) || (p_ace->type == SMB_ACL_GROUP)) {
1628 if (sys_acl_set_qualifier(the_entry,(void *)&p_ace->unix_ug.uid) == -1) {
1629 DEBUG(0,("set_canon_ace_list: Failed to set qualifier on entry %d. (%s)\n",
1630 i, strerror(errno) ));
1636 * Convert the mode_t perms in the canon_ace to a POSIX permset.
1639 if (sys_acl_get_permset(the_entry, &the_permset) == -1) {
1640 DEBUG(0,("set_canon_ace_list: Failed to get permset on entry %d. (%s)\n",
1641 i, strerror(errno) ));
1645 if (map_acl_perms_to_permset(p_ace->perms, &the_permset) == -1) {
1646 DEBUG(0,("set_canon_ace_list: Failed to create permset for mode (%u) on entry %d. (%s)\n",
1647 (unsigned int)p_ace->perms, i, strerror(errno) ));
1652 * ..and apply them to the entry.
1655 if (sys_acl_set_permset(the_entry, the_permset) == -1) {
1656 DEBUG(0,("set_canon_ace_list: Failed to add permset on entry %d. (%s)\n",
1657 i, strerror(errno) ));
1662 print_canon_ace( p_ace, i);
1666 * Add in a mask of rwx.
1669 if (sys_acl_create_entry( &the_acl, &mask_entry) == -1) {
1670 DEBUG(0,("set_canon_ace_list: Failed to create mask entry. (%s)\n", strerror(errno) ));
1674 if (sys_acl_set_tag_type(mask_entry, SMB_ACL_MASK) == -1) {
1675 DEBUG(0,("set_canon_ace_list: Failed to set tag type on mask entry. (%s)\n",strerror(errno) ));
1679 if (sys_acl_get_permset(mask_entry, &mask_permset) == -1) {
1680 DEBUG(0,("set_canon_ace_list: Failed to get mask permset. (%s)\n", strerror(errno) ));
1684 if (map_acl_perms_to_permset(S_IRUSR|S_IWUSR|S_IXUSR, &mask_permset) == -1) {
1685 DEBUG(0,("set_canon_ace_list: Failed to create mask permset. (%s)\n", strerror(errno) ));
1689 if (sys_acl_set_permset(mask_entry, mask_permset) == -1) {
1690 DEBUG(0,("set_canon_ace_list: Failed to add mask permset. (%s)\n", strerror(errno) ));
1695 * Check if the ACL is valid.
1698 if (sys_acl_valid(the_acl) == -1) {
1699 DEBUG(0,("set_canon_ace_list: ACL type (%s) is invalid for set (%s).\n",
1700 the_acl_type == SMB_ACL_TYPE_DEFAULT ? "directory default" : "file",
1706 * Finally apply it to the file or directory.
1709 if(default_ace || fsp->is_directory || fsp->fd == -1) {
1710 if (sys_acl_set_file(fsp->fsp_name, the_acl_type, the_acl) == -1) {
1711 DEBUG(0,("set_canon_ace_list: sys_acl_set_file type %s failed for file %s (%s).\n",
1712 the_acl_type == SMB_ACL_TYPE_DEFAULT ? "directory default" : "file",
1713 fsp->fsp_name, strerror(errno) ));
1717 if (sys_acl_set_fd(fsp->fd, the_acl) == -1) {
1718 DEBUG(0,("set_canon_ace_list: sys_acl_set_file failed for file %s (%s).\n",
1719 fsp->fsp_name, strerror(errno) ));
1728 if (the_acl != NULL)
1729 sys_acl_free_acl(the_acl);
1734 /****************************************************************************
1735 Convert a canon_ace to a generic 3 element permission - if possible.
1736 ****************************************************************************/
1738 #define MAP_PERM(p,mask,result) (((p) & (mask)) ? (result) : 0 )
1740 static BOOL convert_canon_ace_to_posix_perms( files_struct *fsp, canon_ace *file_ace_list, mode_t *posix_perms)
1742 int snum = SNUM(fsp->conn);
1743 size_t ace_count = count_canon_ace_list(file_ace_list);
1745 canon_ace *owner_ace = NULL;
1746 canon_ace *group_ace = NULL;
1747 canon_ace *other_ace = NULL;
1751 if (ace_count != 3) {
1752 DEBUG(3,("convert_canon_ace_to_posix_perms: Too many ACE entries for file %s to convert to \
1753 posix perms.\n", fsp->fsp_name ));
1757 for (ace_p = file_ace_list; ace_p; ace_p = ace_p->next) {
1758 if (ace_p->owner_type == UID_ACE)
1760 else if (ace_p->owner_type == GID_ACE)
1762 else if (ace_p->owner_type == WORLD_ACE)
1766 if (!owner_ace || !group_ace || !other_ace) {
1767 DEBUG(3,("convert_canon_ace_to_posix_perms: Can't get standard entries for file %s.\n",
1772 *posix_perms = (mode_t)0;
1774 *posix_perms |= owner_ace->perms;
1775 *posix_perms |= MAP_PERM(group_ace->perms, S_IRUSR, S_IRGRP);
1776 *posix_perms |= MAP_PERM(group_ace->perms, S_IWUSR, S_IWGRP);
1777 *posix_perms |= MAP_PERM(group_ace->perms, S_IXUSR, S_IXGRP);
1778 *posix_perms |= MAP_PERM(other_ace->perms, S_IRUSR, S_IROTH);
1779 *posix_perms |= MAP_PERM(other_ace->perms, S_IWUSR, S_IWOTH);
1780 *posix_perms |= MAP_PERM(other_ace->perms, S_IXUSR, S_IXOTH);
1782 /* The owner must have at least read access. */
1784 *posix_perms |= S_IRUSR;
1785 if (fsp->is_directory)
1786 *posix_perms |= (S_IWUSR|S_IXUSR);
1788 /* If requested apply the masks. */
1790 /* Get the initial bits to apply. */
1792 if (fsp->is_directory) {
1793 and_bits = lp_dir_security_mask(snum);
1794 or_bits = lp_force_dir_security_mode(snum);
1796 and_bits = lp_security_mask(snum);
1797 or_bits = lp_force_security_mode(snum);
1800 *posix_perms = (((*posix_perms) & and_bits)|or_bits);
1802 DEBUG(10,("convert_canon_ace_to_posix_perms: converted u=%o,g=%o,w=%o to perm=0%o for file %s.\n",
1803 (int)owner_ace->perms, (int)group_ace->perms, (int)other_ace->perms, (int)*posix_perms,
1809 static int nt_ace_comp( SEC_ACE *a1, SEC_ACE *a2)
1811 if (a1->type == a2->type)
1814 if (a1->type == SEC_ACE_TYPE_ACCESS_DENIED && a2->type == SEC_ACE_TYPE_ACCESS_ALLOWED)
1819 /****************************************************************************
1820 Reply to query a security descriptor from an fsp. If it succeeds it allocates
1821 the space for the return elements and returns the size needed to return the
1822 security descriptor. This should be the only external function needed for
1823 the UNIX style get ACL.
1824 ****************************************************************************/
1826 size_t get_nt_acl(files_struct *fsp, SEC_DESC **ppdesc)
1828 SMB_STRUCT_STAT sbuf;
1829 SEC_ACE *nt_ace_list = NULL;
1833 SEC_ACL *psa = NULL;
1834 size_t num_acls = 0;
1835 size_t num_dir_acls = 0;
1836 size_t num_aces = 0;
1837 SMB_ACL_T posix_acl = NULL;
1838 SMB_ACL_T dir_acl = NULL;
1839 canon_ace *file_ace = NULL;
1840 canon_ace *dir_ace = NULL;
1844 DEBUG(10,("get_nt_acl: called for file %s\n", fsp->fsp_name ));
1846 if(fsp->is_directory || fsp->fd == -1) {
1848 /* Get the stat struct for the owner info. */
1849 if(vfs_stat(fsp->conn,fsp->fsp_name, &sbuf) != 0) {
1853 * Get the ACL from the path.
1856 posix_acl = sys_acl_get_file(fsp->fsp_name, SMB_ACL_TYPE_ACCESS);
1859 * If it's a directory get the default POSIX ACL.
1862 if(fsp->is_directory)
1863 dir_acl = sys_acl_get_file(fsp->fsp_name, SMB_ACL_TYPE_DEFAULT);
1867 /* Get the stat struct for the owner info. */
1868 if(vfs_fstat(fsp,fsp->fd,&sbuf) != 0) {
1872 * Get the ACL from the fd.
1874 posix_acl = sys_acl_get_fd(fsp->fd);
1877 DEBUG(5,("get_nt_acl : file ACL %s, directory ACL %s\n",
1878 posix_acl ? "present" : "absent",
1879 dir_acl ? "present" : "absent" ));
1882 * Get the owner, group and world SIDs.
1885 create_file_sids(&sbuf, &owner_sid, &group_sid);
1887 /* Create the canon_ace lists. */
1888 file_ace = canonicalise_acl( fsp, posix_acl, &sbuf, &owner_sid, &group_sid);
1889 num_acls = count_canon_ace_list(file_ace);
1891 /* We must have *some* ACLS. */
1893 if (num_acls == 0) {
1894 DEBUG(0,("get_nt_acl : No ACLs on file (%s) !\n", fsp->fsp_name ));
1898 if (fsp->is_directory) {
1900 * If we have to fake a default ACL then this is the mode to use.
1902 sbuf.st_mode = unix_mode( fsp->conn, FILE_ATTRIBUTE_ARCHIVE, fsp->fsp_name);
1904 dir_ace = canonicalise_acl(fsp, dir_acl, &sbuf, &owner_sid, &group_sid);
1905 num_dir_acls = count_canon_ace_list(dir_ace);
1908 /* Allocate the ace list. */
1909 if ((nt_ace_list = (SEC_ACE *)malloc((num_acls + num_dir_acls)* sizeof(SEC_ACE))) == NULL) {
1910 DEBUG(0,("get_nt_acl: Unable to malloc space for nt_ace_list.\n"));
1914 memset(nt_ace_list, '\0', (num_acls + num_dir_acls) * sizeof(SEC_ACE) );
1917 * Create the NT ACE list from the canonical ace lists.
1927 for (i = 0; i < num_acls; i++, ace = ace->next) {
1928 SEC_ACCESS acc = map_canon_ace_perms(&nt_acl_type, &owner_sid, ace );
1929 init_sec_ace(&nt_ace_list[num_aces++], &ace->sid, nt_acl_type, acc, 0);
1934 for (i = 0; i < num_dir_acls; i++, ace = ace->next) {
1935 SEC_ACCESS acc = map_canon_ace_perms(&nt_acl_type, &owner_sid, ace );
1936 init_sec_ace(&nt_ace_list[num_aces++], &ace->sid, nt_acl_type, acc,
1937 SEC_ACE_FLAG_OBJECT_INHERIT|SEC_ACE_FLAG_CONTAINER_INHERIT|SEC_ACE_FLAG_INHERIT_ONLY);
1941 * Sort to force deny entries to the front.
1944 if (num_acls + num_dir_acls)
1945 qsort( nt_ace_list, num_acls + num_dir_acls, sizeof(nt_ace_list[0]), QSORT_CAST nt_ace_comp);
1949 if((psa = make_sec_acl( main_loop_talloc_get(), ACL_REVISION, num_aces, nt_ace_list)) == NULL) {
1950 DEBUG(0,("get_nt_acl: Unable to malloc space for acl.\n"));
1955 *ppdesc = make_standard_sec_desc( main_loop_talloc_get(), &owner_sid, &group_sid, psa, &sd_size);
1958 DEBUG(0,("get_nt_acl: Unable to malloc space for security descriptor.\n"));
1965 sys_acl_free_acl(posix_acl);
1967 sys_acl_free_acl(dir_acl);
1968 free_canon_ace_list(file_ace);
1969 free_canon_ace_list(dir_ace);
1970 SAFE_FREE(nt_ace_list);
1975 /****************************************************************************
1976 Reply to set a security descriptor on an fsp. security_info_sent is the
1977 description of the following NT ACL.
1978 This should be the only external function needed for the UNIX style set ACL.
1979 ****************************************************************************/
1981 BOOL set_nt_acl(files_struct *fsp, uint32 security_info_sent, SEC_DESC *psd)
1983 connection_struct *conn = fsp->conn;
1984 uid_t user = (uid_t)-1;
1985 gid_t grp = (gid_t)-1;
1986 SMB_STRUCT_STAT sbuf;
1987 DOM_SID file_owner_sid;
1988 DOM_SID file_grp_sid;
1989 canon_ace *file_ace_list = NULL;
1990 canon_ace *dir_ace_list = NULL;
1991 BOOL acl_perms = False;
1992 mode_t orig_mode = (mode_t)0;
1996 DEBUG(10,("set_nt_acl: called for file %s\n", fsp->fsp_name ));
1999 * Get the current state of the file.
2002 if(fsp->is_directory || fsp->fd == -1) {
2003 if(vfs_stat(fsp->conn,fsp->fsp_name, &sbuf) != 0)
2006 if(vfs_fstat(fsp,fsp->fd,&sbuf) != 0)
2010 /* Save the original elements we check against. */
2011 orig_mode = sbuf.st_mode;
2012 orig_uid = sbuf.st_uid;
2013 orig_gid = sbuf.st_gid;
2016 * Unpack the user/group/world id's.
2019 if (!unpack_nt_owners( &sbuf, &user, &grp, security_info_sent, psd))
2023 * Do we need to chown ?
2026 if((user != (uid_t)-1 || grp != (uid_t)-1) && (orig_uid != user || orig_gid != grp)) {
2028 DEBUG(3,("set_nt_acl: chown %s. uid = %u, gid = %u.\n",
2029 fsp->fsp_name, (unsigned int)user, (unsigned int)grp ));
2031 if(vfs_chown( fsp->conn, fsp->fsp_name, user, grp) == -1) {
2032 DEBUG(3,("set_nt_acl: chown %s, %u, %u failed. Error = %s.\n",
2033 fsp->fsp_name, (unsigned int)user, (unsigned int)grp, strerror(errno) ));
2038 * Recheck the current state of the file, which may have changed.
2039 * (suid/sgid bits, for instance)
2042 if(fsp->is_directory) {
2043 if(vfs_stat(fsp->conn, fsp->fsp_name, &sbuf) != 0) {
2051 ret = vfs_stat(fsp->conn, fsp->fsp_name, &sbuf);
2053 ret = vfs_fstat(fsp,fsp->fd,&sbuf);
2059 /* Save the original elements we check against. */
2060 orig_mode = sbuf.st_mode;
2061 orig_uid = sbuf.st_uid;
2062 orig_gid = sbuf.st_gid;
2065 create_file_sids(&sbuf, &file_owner_sid, &file_grp_sid);
2067 acl_perms = unpack_canon_ace( fsp, &sbuf, &file_owner_sid, &file_grp_sid,
2068 &file_ace_list, &dir_ace_list, security_info_sent, psd);
2070 if ((file_ace_list == NULL) && (dir_ace_list == NULL)) {
2071 /* W2K traverse DACL set - ignore. */
2076 DEBUG(3,("set_nt_acl: cannot set permissions\n"));
2077 free_canon_ace_list(file_ace_list);
2078 free_canon_ace_list(dir_ace_list);
2083 * Only change security if we got a DACL.
2086 if((security_info_sent & DACL_SECURITY_INFORMATION) && (psd->dacl != NULL)) {
2088 BOOL acl_set_support = False;
2092 * Try using the POSIX ACL set first. Fall back to chmod if
2093 * we have no ACL support on this filesystem.
2096 if (acl_perms && file_ace_list) {
2097 ret = set_canon_ace_list(fsp, file_ace_list, False, &acl_set_support);
2098 if (acl_set_support && ret == False) {
2099 DEBUG(3,("set_nt_acl: failed to set file acl on file %s (%s).\n", fsp->fsp_name, strerror(errno) ));
2100 free_canon_ace_list(file_ace_list);
2101 free_canon_ace_list(dir_ace_list);
2106 if (acl_perms && acl_set_support && fsp->is_directory) {
2108 if (!set_canon_ace_list(fsp, dir_ace_list, True, &acl_set_support)) {
2109 DEBUG(3,("set_nt_acl: failed to set default acl on directory %s (%s).\n", fsp->fsp_name, strerror(errno) ));
2110 free_canon_ace_list(file_ace_list);
2111 free_canon_ace_list(dir_ace_list);
2117 * No default ACL - delete one if it exists.
2120 if (sys_acl_delete_def_file(fsp->fsp_name) == -1) {
2121 DEBUG(3,("set_nt_acl: sys_acl_delete_def_file failed (%s)\n", strerror(errno)));
2122 free_canon_ace_list(file_ace_list);
2129 * If we cannot set using POSIX ACLs we fall back to checking if we need to chmod.
2132 if(!acl_set_support && acl_perms) {
2135 if (!convert_canon_ace_to_posix_perms( fsp, file_ace_list, &posix_perms)) {
2136 free_canon_ace_list(file_ace_list);
2137 free_canon_ace_list(dir_ace_list);
2138 DEBUG(3,("set_nt_acl: failed to convert file acl to posix permissions for file %s.\n",
2143 if (orig_mode != posix_perms) {
2145 DEBUG(3,("set_nt_acl: chmod %s. perms = 0%o.\n",
2146 fsp->fsp_name, (unsigned int)posix_perms ));
2148 if(conn->vfs_ops.chmod(conn,fsp->fsp_name, posix_perms) == -1) {
2149 DEBUG(3,("set_nt_acl: chmod %s, 0%o failed. Error = %s.\n",
2150 fsp->fsp_name, (unsigned int)posix_perms, strerror(errno) ));
2151 free_canon_ace_list(file_ace_list);
2152 free_canon_ace_list(dir_ace_list);
2159 free_canon_ace_list(file_ace_list);
2160 free_canon_ace_list(dir_ace_list);
2165 /****************************************************************************
2166 Do a chmod by setting the ACL USER_OBJ, GROUP_OBJ and OTHER bits in an ACL
2167 and set the mask to rwx. Needed to preserve complex ACLs set by NT.
2168 ****************************************************************************/
2170 static int chmod_acl_internals( SMB_ACL_T posix_acl, mode_t mode)
2172 int entry_id = SMB_ACL_FIRST_ENTRY;
2173 SMB_ACL_ENTRY_T entry;
2174 int num_entries = 0;
2176 while ( sys_acl_get_entry(posix_acl, entry_id, &entry) == 1) {
2177 SMB_ACL_TAG_T tagtype;
2178 SMB_ACL_PERMSET_T permset;
2182 if (entry_id == SMB_ACL_FIRST_ENTRY)
2183 entry_id = SMB_ACL_NEXT_ENTRY;
2185 if (sys_acl_get_tag_type(entry, &tagtype) == -1)
2188 if (sys_acl_get_permset(entry, &permset) == -1)
2194 case SMB_ACL_USER_OBJ:
2195 perms = unix_perms_to_acl_perms(mode, S_IRUSR, S_IWUSR, S_IXUSR);
2197 case SMB_ACL_GROUP_OBJ:
2198 perms = unix_perms_to_acl_perms(mode, S_IRGRP, S_IWGRP, S_IXGRP);
2201 perms = S_IRUSR|S_IWUSR|S_IXUSR;
2204 perms = unix_perms_to_acl_perms(mode, S_IROTH, S_IWOTH, S_IXOTH);
2210 if (map_acl_perms_to_permset(perms, &permset) == -1)
2213 if (sys_acl_set_permset(entry, permset) == -1)
2218 * If this is a simple 3 element ACL or no elements then it's a standard
2219 * UNIX permission set. Just use chmod...
2222 if ((num_entries == 3) || (num_entries == 0))
2228 /****************************************************************************
2229 Do a chmod by setting the ACL USER_OBJ, GROUP_OBJ and OTHER bits in an ACL
2230 and set the mask to rwx. Needed to preserve complex ACLs set by NT.
2231 Note that name is in UNIX character set.
2232 ****************************************************************************/
2234 int chmod_acl(const char *name, mode_t mode)
2236 SMB_ACL_T posix_acl = NULL;
2239 if ((posix_acl = sys_acl_get_file(name, SMB_ACL_TYPE_ACCESS)) == NULL)
2242 if ((ret = chmod_acl_internals(posix_acl, mode)) == -1)
2245 ret = sys_acl_set_file(name, SMB_ACL_TYPE_ACCESS, posix_acl);
2249 sys_acl_free_acl(posix_acl);
2253 /****************************************************************************
2254 Do an fchmod by setting the ACL USER_OBJ, GROUP_OBJ and OTHER bits in an ACL
2255 and set the mask to rwx. Needed to preserve complex ACLs set by NT.
2256 ****************************************************************************/
2258 int fchmod_acl(int fd, mode_t mode)
2260 SMB_ACL_T posix_acl = NULL;
2263 if ((posix_acl = sys_acl_get_fd(fd)) == NULL)
2266 if ((ret = chmod_acl_internals(posix_acl, mode)) == -1)
2269 ret = sys_acl_set_fd(fd, posix_acl);
2273 sys_acl_free_acl(posix_acl);