2 * Handle passing Access Control Lists between systems.
4 * Copyright (C) 1996 Andrew Tridgell
5 * Copyright (C) 1996 Paul Mackerras
6 * Copyright (C) 2006-2009 Wayne Davison
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 3 of the License, or
11 * (at your option) any later version.
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
18 * You should have received a copy of the GNU General Public License along
19 * with this program; if not, visit the http://fsf.org website.
23 #include "lib/sysacls.h"
31 extern int orig_umask;
32 extern int numeric_ids;
33 extern int inc_recurse;
35 /* Flags used to indicate what items are being transmitted for an entry. */
36 #define XMIT_USER_OBJ (1<<0)
37 #define XMIT_GROUP_OBJ (1<<1)
38 #define XMIT_MASK_OBJ (1<<2)
39 #define XMIT_OTHER_OBJ (1<<3)
40 #define XMIT_NAME_LIST (1<<4)
42 #define NO_ENTRY ((uchar)0x80) /* Default value of a NON-name-list entry. */
44 #define NAME_IS_USER (1u<<31) /* Bit used only on a name-list entry. */
46 /* When we send the access bits over the wire, we shift them 2 bits to the
47 * left and use the lower 2 bits as flags (relevant only to a name entry).
48 * This makes the protocol more efficient than sending a value that would
49 * be likely to have its hightest bits set. */
50 #define XFLAG_NAME_FOLLOWS 0x0001u
51 #define XFLAG_NAME_IS_USER 0x0002u
53 /* === ACL structures === */
70 typedef struct rsync_acl {
72 /* These will be NO_ENTRY if there's no such entry. */
84 static const rsync_acl empty_rsync_acl = {
85 {NULL, 0}, NO_ENTRY, NO_ENTRY, NO_ENTRY, NO_ENTRY
88 static item_list access_acl_list = EMPTY_ITEM_LIST;
89 static item_list default_acl_list = EMPTY_ITEM_LIST;
91 static size_t prior_access_count = (size_t)-1;
92 static size_t prior_default_count = (size_t)-1;
94 /* === Calculations on ACL types === */
96 static const char *str_acl_type(SMB_ACL_TYPE_T type)
99 case SMB_ACL_TYPE_ACCESS:
101 return "ACL_TYPE_EXTENDED";
103 return "ACL_TYPE_ACCESS";
105 case SMB_ACL_TYPE_DEFAULT:
106 return "ACL_TYPE_DEFAULT";
110 return "unknown ACL type!";
113 static int calc_sacl_entries(const rsync_acl *racl)
115 /* A System ACL always gets user/group/other permission entries. */
116 return racl->names.count
117 #ifdef ACLS_NEED_MASK
120 + (racl->mask_obj != NO_ENTRY) + 3;
124 /* Extracts and returns the permission bits from the ACL. This cannot be
125 * called on an rsync_acl that has NO_ENTRY in any spot but the mask. */
126 static int rsync_acl_get_perms(const rsync_acl *racl)
128 return (racl->user_obj << 6)
129 + ((racl->mask_obj != NO_ENTRY ? racl->mask_obj : racl->group_obj) << 3)
133 /* Removes the permission-bit entries from the ACL because these
134 * can be reconstructed from the file's mode. */
135 static void rsync_acl_strip_perms(rsync_acl *racl)
137 racl->user_obj = NO_ENTRY;
138 if (racl->mask_obj == NO_ENTRY)
139 racl->group_obj = NO_ENTRY;
141 if (racl->group_obj == racl->mask_obj)
142 racl->group_obj = NO_ENTRY;
143 if (racl->names.count != 0)
144 racl->mask_obj = NO_ENTRY;
146 racl->other_obj = NO_ENTRY;
149 /* Given an empty rsync_acl, fake up the permission bits. */
150 static void rsync_acl_fake_perms(rsync_acl *racl, mode_t mode)
152 racl->user_obj = (mode >> 6) & 7;
153 racl->group_obj = (mode >> 3) & 7;
154 racl->other_obj = mode & 7;
157 /* === Rsync ACL functions === */
159 static rsync_acl *create_racl(void)
161 rsync_acl *racl = new(rsync_acl);
164 out_of_memory("create_racl");
165 *racl = empty_rsync_acl;
170 static BOOL ida_entries_equal(const ida_entries *ial1, const ida_entries *ial2)
172 id_access *ida1, *ida2;
173 int count = ial1->count;
174 if (count != ial2->count)
178 for (; count--; ida1++, ida2++) {
179 if (ida1->access != ida2->access || ida1->id != ida2->id)
185 static BOOL rsync_acl_equal(const rsync_acl *racl1, const rsync_acl *racl2)
187 return racl1->user_obj == racl2->user_obj
188 && racl1->group_obj == racl2->group_obj
189 && racl1->mask_obj == racl2->mask_obj
190 && racl1->other_obj == racl2->other_obj
191 && ida_entries_equal(&racl1->names, &racl2->names);
194 /* Are the extended (non-permission-bit) entries equal? If so, the rest of
195 * the ACL will be handled by the normal mode-preservation code. This is
196 * only meaningful for access ACLs! Note: the 1st arg is a fully-populated
197 * rsync_acl, but the 2nd parameter can be a condensed rsync_acl, which means
198 * that it might have several of its permission objects set to NO_ENTRY. */
199 static BOOL rsync_acl_equal_enough(const rsync_acl *racl1,
200 const rsync_acl *racl2, mode_t m)
202 if ((racl1->mask_obj ^ racl2->mask_obj) & NO_ENTRY)
203 return False; /* One has a mask and the other doesn't */
205 /* When there's a mask, the group_obj becomes an extended entry. */
206 if (racl1->mask_obj != NO_ENTRY) {
207 /* A condensed rsync_acl with a mask can only have no
208 * group_obj when it was identical to the mask. This
209 * means that it was also identical to the group attrs
211 if (racl2->group_obj == NO_ENTRY) {
212 if (racl1->group_obj != ((m >> 3) & 7))
214 } else if (racl1->group_obj != racl2->group_obj)
217 return ida_entries_equal(&racl1->names, &racl2->names);
220 static void rsync_acl_free(rsync_acl *racl)
222 if (racl->names.idas)
223 free(racl->names.idas);
224 *racl = empty_rsync_acl;
227 void free_acl(stat_x *sxp)
230 rsync_acl_free(sxp->acc_acl);
235 rsync_acl_free(sxp->def_acl);
241 #ifdef SMB_ACL_NEED_SORT
242 static int id_access_sorter(const void *r1, const void *r2)
244 id_access *ida1 = (id_access *)r1;
245 id_access *ida2 = (id_access *)r2;
246 id_t rid1 = ida1->id, rid2 = ida2->id;
247 if ((ida1->access ^ ida2->access) & NAME_IS_USER)
248 return ida1->access & NAME_IS_USER ? -1 : 1;
249 return rid1 == rid2 ? 0 : rid1 < rid2 ? -1 : 1;
253 /* === System ACLs === */
255 /* Unpack system ACL -> rsync ACL verbatim. Return whether we succeeded. */
256 static BOOL unpack_smb_acl(SMB_ACL_T sacl, rsync_acl *racl)
258 static item_list temp_ida_list = EMPTY_ITEM_LIST;
259 SMB_ACL_ENTRY_T entry;
263 errfun = "sys_acl_get_entry";
264 for (rc = sys_acl_get_entry(sacl, SMB_ACL_FIRST_ENTRY, &entry);
266 rc = sys_acl_get_entry(sacl, SMB_ACL_NEXT_ENTRY, &entry)) {
267 SMB_ACL_TAG_T tag_type;
271 if ((rc = sys_acl_get_info(entry, &tag_type, &access, &g_u_id)) != 0) {
272 errfun = "sys_acl_get_info";
275 /* continue == done with entry; break == store in temporary ida list */
277 #ifndef HAVE_OSX_ACLS
278 case SMB_ACL_USER_OBJ:
279 if (racl->user_obj == NO_ENTRY)
280 racl->user_obj = access;
282 rprintf(FINFO, "unpack_smb_acl: warning: duplicate USER_OBJ entry ignored\n");
284 case SMB_ACL_GROUP_OBJ:
285 if (racl->group_obj == NO_ENTRY)
286 racl->group_obj = access;
288 rprintf(FINFO, "unpack_smb_acl: warning: duplicate GROUP_OBJ entry ignored\n");
291 if (racl->mask_obj == NO_ENTRY)
292 racl->mask_obj = access;
294 rprintf(FINFO, "unpack_smb_acl: warning: duplicate MASK entry ignored\n");
297 if (racl->other_obj == NO_ENTRY)
298 racl->other_obj = access;
300 rprintf(FINFO, "unpack_smb_acl: warning: duplicate OTHER entry ignored\n");
304 access |= NAME_IS_USER;
309 rprintf(FINFO, "unpack_smb_acl: warning: entry with unrecognized tag type ignored\n");
312 ida = EXPAND_ITEM_LIST(&temp_ida_list, id_access, -10);
314 ida->access = access;
317 rsyserr(FERROR_XFER, errno, "unpack_smb_acl: %s()", errfun);
318 rsync_acl_free(racl);
322 /* Transfer the count id_access items out of the temp_ida_list
323 * into the names ida_entries list in racl. */
324 if (temp_ida_list.count) {
325 #ifdef SMB_ACL_NEED_SORT
326 if (temp_ida_list.count > 1) {
327 qsort(temp_ida_list.items, temp_ida_list.count,
328 sizeof (id_access), id_access_sorter);
331 if (!(racl->names.idas = new_array(id_access, temp_ida_list.count)))
332 out_of_memory("unpack_smb_acl");
333 memcpy(racl->names.idas, temp_ida_list.items,
334 temp_ida_list.count * sizeof (id_access));
336 racl->names.idas = NULL;
338 racl->names.count = temp_ida_list.count;
340 /* Truncate the temporary list now that its idas have been saved. */
341 temp_ida_list.count = 0;
343 #ifdef ACLS_NEED_MASK
344 if (!racl->names.count && racl->mask_obj != NO_ENTRY) {
345 /* Throw away a superfluous mask, but mask off the
346 * group perms with it first. */
347 racl->group_obj &= racl->mask_obj;
348 racl->mask_obj = NO_ENTRY;
355 /* Synactic sugar for system calls */
357 #define CALL_OR_ERROR(func,args,str) \
365 #define COE(func,args) CALL_OR_ERROR(func,args,#func)
366 #define COE2(func,args) CALL_OR_ERROR(func,args,NULL)
368 #ifndef HAVE_OSX_ACLS
369 /* Store the permissions in the system ACL entry. */
370 static int store_access_in_entry(uint32 access, SMB_ACL_ENTRY_T entry)
372 if (sys_acl_set_access_bits(entry, access)) {
373 rsyserr(FERROR_XFER, errno, "store_access_in_entry sys_acl_set_access_bits()");
380 /* Pack rsync ACL -> system ACL verbatim. Return whether we succeeded. */
381 static BOOL pack_smb_acl(SMB_ACL_T *smb_acl, const rsync_acl *racl)
383 #ifdef ACLS_NEED_MASK
388 const char *errfun = NULL;
389 SMB_ACL_ENTRY_T entry;
391 if (!(*smb_acl = sys_acl_init(calc_sacl_entries(racl)))) {
392 rsyserr(FERROR_XFER, errno, "pack_smb_acl: sys_acl_init()");
396 #ifndef HAVE_OSX_ACLS
397 COE( sys_acl_create_entry,(smb_acl, &entry) );
398 COE( sys_acl_set_info,(entry, SMB_ACL_USER_OBJ, racl->user_obj & ~NO_ENTRY, 0) );
401 for (ida = racl->names.idas, count = racl->names.count; count; ida++, count--) {
402 #ifdef SMB_ACL_NEED_SORT
403 if (!(ida->access & NAME_IS_USER))
406 COE( sys_acl_create_entry,(smb_acl, &entry) );
407 COE( sys_acl_set_info,
409 ida->access & NAME_IS_USER ? SMB_ACL_USER : SMB_ACL_GROUP,
410 ida->access & ~NAME_IS_USER, ida->id) );
413 #ifndef HAVE_OSX_ACLS
414 COE( sys_acl_create_entry,(smb_acl, &entry) );
415 COE( sys_acl_set_info,(entry, SMB_ACL_GROUP_OBJ, racl->group_obj & ~NO_ENTRY, 0) );
417 #ifdef SMB_ACL_NEED_SORT
418 for ( ; count; ida++, count--) {
419 COE( sys_acl_create_entry,(smb_acl, &entry) );
420 COE( sys_acl_set_info,(entry, SMB_ACL_GROUP, ida->access, ida->id) );
424 #ifdef ACLS_NEED_MASK
425 mask_bits = racl->mask_obj == NO_ENTRY ? racl->group_obj & ~NO_ENTRY : racl->mask_obj;
426 COE( sys_acl_create_entry,(smb_acl, &entry) );
427 COE( sys_acl_set_info,(entry, SMB_ACL_MASK, mask_bits, NULL) );
429 if (racl->mask_obj != NO_ENTRY) {
430 COE( sys_acl_create_entry,(smb_acl, &entry) );
431 COE( sys_acl_set_info,(entry, SMB_ACL_MASK, racl->mask_obj, 0) );
435 COE( sys_acl_create_entry,(smb_acl, &entry) );
436 COE( sys_acl_set_info,(entry, SMB_ACL_OTHER, racl->other_obj & ~NO_ENTRY, 0) );
440 if (sys_acl_valid(*smb_acl) < 0)
441 rprintf(FERROR_XFER, "pack_smb_acl: warning: system says the ACL I packed is invalid\n");
448 rsyserr(FERROR_XFER, errno, "pack_smb_acl %s()", errfun);
450 sys_acl_free_acl(*smb_acl);
454 static int find_matching_rsync_acl(const rsync_acl *racl, SMB_ACL_TYPE_T type,
455 const item_list *racl_list)
457 static int access_match = -1, default_match = -1;
458 int *match = type == SMB_ACL_TYPE_ACCESS ? &access_match : &default_match;
459 size_t count = racl_list->count;
461 /* If this is the first time through or we didn't match the last
462 * time, then start at the end of the list, which should be the
463 * best place to start hunting. */
465 *match = racl_list->count - 1;
467 rsync_acl *base = racl_list->items;
468 if (rsync_acl_equal(base + *match, racl))
471 *match = racl_list->count - 1;
478 static int get_rsync_acl(const char *fname, rsync_acl *racl,
479 SMB_ACL_TYPE_T type, mode_t mode)
483 #ifdef SUPPORT_XATTRS
484 /* --fake-super support: load ACLs from an xattr. */
490 if ((buf = get_xattr_acl(fname, type == SMB_ACL_TYPE_ACCESS, &len)) == NULL)
492 cnt = (len - 4*4) / (4+4);
493 if (len < 4*4 || len != (size_t)cnt*(4+4) + 4*4) {
498 racl->user_obj = IVAL(buf, 0);
499 racl->group_obj = IVAL(buf, 4);
500 racl->mask_obj = IVAL(buf, 8);
501 racl->other_obj = IVAL(buf, 12);
504 char *bp = buf + 4*4;
506 if (!(ida = racl->names.idas = new_array(id_access, cnt)))
507 out_of_memory("get_rsync_acl");
508 racl->names.count = cnt;
509 for ( ; cnt--; ida++, bp += 4+4) {
510 ida->id = IVAL(bp, 0);
511 ida->access = IVAL(bp, 4);
519 if ((sacl = sys_acl_get_file(fname, type)) != 0) {
520 BOOL ok = unpack_smb_acl(sacl, racl);
522 sys_acl_free_acl(sacl);
526 } else if (no_acl_syscall_error(errno)) {
527 /* ACLs are not supported, so pretend we have a basic ACL. */
528 if (type == SMB_ACL_TYPE_ACCESS)
529 rsync_acl_fake_perms(racl, mode);
531 rsyserr(FERROR_XFER, errno, "get_acl: sys_acl_get_file(%s, %s)",
532 fname, str_acl_type(type));
539 /* Return the Access Control List for the given filename. */
540 int get_acl(const char *fname, stat_x *sxp)
542 sxp->acc_acl = create_racl();
543 if (get_rsync_acl(fname, sxp->acc_acl, SMB_ACL_TYPE_ACCESS,
544 sxp->st.st_mode) < 0) {
549 if (S_ISDIR(sxp->st.st_mode)) {
550 sxp->def_acl = create_racl();
551 if (get_rsync_acl(fname, sxp->def_acl, SMB_ACL_TYPE_DEFAULT,
552 sxp->st.st_mode) < 0) {
561 /* === Send functions === */
563 /* Send the ida list over the file descriptor. */
564 static void send_ida_entries(const ida_entries *idal, int f)
567 size_t count = idal->count;
569 write_varint(f, idal->count);
571 for (ida = idal->idas; count--; ida++) {
572 uint32 xbits = ida->access << 2;
574 if (ida->access & NAME_IS_USER) {
575 xbits |= XFLAG_NAME_IS_USER;
576 name = add_uid(ida->id);
578 name = add_gid(ida->id);
579 write_varint(f, ida->id);
580 if (inc_recurse && name) {
581 int len = strlen(name);
582 write_varint(f, xbits | XFLAG_NAME_FOLLOWS);
584 write_buf(f, name, len);
586 write_varint(f, xbits);
590 static void send_rsync_acl(rsync_acl *racl, SMB_ACL_TYPE_T type,
591 item_list *racl_list, int f)
593 int ndx = find_matching_rsync_acl(racl, type, racl_list);
595 /* Send 0 (-1 + 1) to indicate that literal ACL data follows. */
596 write_varint(f, ndx + 1);
599 rsync_acl *new_racl = EXPAND_ITEM_LIST(racl_list, rsync_acl, 1000);
602 if (racl->user_obj != NO_ENTRY)
603 flags |= XMIT_USER_OBJ;
604 if (racl->group_obj != NO_ENTRY)
605 flags |= XMIT_GROUP_OBJ;
606 if (racl->mask_obj != NO_ENTRY)
607 flags |= XMIT_MASK_OBJ;
608 if (racl->other_obj != NO_ENTRY)
609 flags |= XMIT_OTHER_OBJ;
610 if (racl->names.count)
611 flags |= XMIT_NAME_LIST;
613 write_byte(f, flags);
615 if (flags & XMIT_USER_OBJ)
616 write_varint(f, racl->user_obj);
617 if (flags & XMIT_GROUP_OBJ)
618 write_varint(f, racl->group_obj);
619 if (flags & XMIT_MASK_OBJ)
620 write_varint(f, racl->mask_obj);
621 if (flags & XMIT_OTHER_OBJ)
622 write_varint(f, racl->other_obj);
623 if (flags & XMIT_NAME_LIST)
624 send_ida_entries(&racl->names, f);
626 /* Give the allocated data to the new list object. */
628 *racl = empty_rsync_acl;
632 /* Send the ACL from the stat_x structure down the indicated file descriptor.
633 * This also frees the ACL data. */
634 void send_acl(stat_x *sxp, int f)
637 sxp->acc_acl = create_racl();
638 rsync_acl_fake_perms(sxp->acc_acl, sxp->st.st_mode);
640 /* Avoid sending values that can be inferred from other data. */
641 rsync_acl_strip_perms(sxp->acc_acl);
643 send_rsync_acl(sxp->acc_acl, SMB_ACL_TYPE_ACCESS, &access_acl_list, f);
645 if (S_ISDIR(sxp->st.st_mode)) {
647 sxp->def_acl = create_racl();
649 send_rsync_acl(sxp->def_acl, SMB_ACL_TYPE_DEFAULT, &default_acl_list, f);
653 /* === Receive functions === */
655 static uint32 recv_acl_access(uchar *name_follows_ptr, int f)
657 uint32 access = read_varint(f);
659 if (name_follows_ptr) {
660 int flags = access & 3;
662 if (am_root >= 0 && access & ~SMB_ACL_VALID_NAME_BITS)
664 if (flags & XFLAG_NAME_FOLLOWS)
665 *name_follows_ptr = 1;
667 *name_follows_ptr = 0;
668 if (flags & XFLAG_NAME_IS_USER)
669 access |= NAME_IS_USER;
670 } else if (am_root >= 0 && access & ~SMB_ACL_VALID_OBJ_BITS) {
672 rprintf(FERROR_XFER, "recv_acl_access: value out of range: %x\n",
674 exit_cleanup(RERR_STREAMIO);
680 static uchar recv_ida_entries(ida_entries *ent, int f)
682 uchar computed_mask_bits = 0;
683 int i, count = read_varint(f);
686 if (!(ent->idas = new_array(id_access, count)))
687 out_of_memory("recv_ida_entries");
693 for (i = 0; i < count; i++) {
695 id_t id = read_varint(f);
696 uint32 access = recv_acl_access(&has_name, f);
699 if (access & NAME_IS_USER)
700 id = recv_user_name(f, id);
702 id = recv_group_name(f, id, NULL);
703 } else if (access & NAME_IS_USER) {
704 if (inc_recurse && am_root && !numeric_ids)
707 if (inc_recurse && (!am_root || !numeric_ids))
708 id = match_gid(id, NULL);
711 ent->idas[i].id = id;
712 ent->idas[i].access = access;
713 computed_mask_bits |= access;
716 return computed_mask_bits & ~NO_ENTRY;
719 static int recv_rsync_acl(item_list *racl_list, SMB_ACL_TYPE_T type, int f)
721 uchar computed_mask_bits = 0;
724 int ndx = read_varint(f);
726 if (ndx < 0 || (size_t)ndx > racl_list->count) {
727 rprintf(FERROR_XFER, "recv_acl_index: %s ACL index %d > %d\n",
728 str_acl_type(type), ndx, (int)racl_list->count);
729 exit_cleanup(RERR_STREAMIO);
735 ndx = racl_list->count;
736 duo_item = EXPAND_ITEM_LIST(racl_list, acl_duo, 1000);
737 duo_item->racl = empty_rsync_acl;
739 flags = read_byte(f);
741 if (flags & XMIT_USER_OBJ)
742 duo_item->racl.user_obj = recv_acl_access(NULL, f);
743 if (flags & XMIT_GROUP_OBJ)
744 duo_item->racl.group_obj = recv_acl_access(NULL, f);
745 if (flags & XMIT_MASK_OBJ)
746 duo_item->racl.mask_obj = recv_acl_access(NULL, f);
747 if (flags & XMIT_OTHER_OBJ)
748 duo_item->racl.other_obj = recv_acl_access(NULL, f);
749 if (flags & XMIT_NAME_LIST)
750 computed_mask_bits |= recv_ida_entries(&duo_item->racl.names, f);
753 /* If we received a superfluous mask, throw it away. */
754 duo_item->racl.mask_obj = NO_ENTRY;
756 if (duo_item->racl.names.count && duo_item->racl.mask_obj == NO_ENTRY) /* Must be non-empty with lists. */
757 duo_item->racl.mask_obj = (computed_mask_bits | duo_item->racl.group_obj) & ~NO_ENTRY;
760 duo_item->sacl = NULL;
765 /* Receive the ACL info the sender has included for this file-list entry. */
766 void receive_acl(struct file_struct *file, int f)
768 F_ACL(file) = recv_rsync_acl(&access_acl_list, SMB_ACL_TYPE_ACCESS, f);
770 if (S_ISDIR(file->mode))
771 F_DIR_DEFACL(file) = recv_rsync_acl(&default_acl_list, SMB_ACL_TYPE_DEFAULT, f);
774 static int cache_rsync_acl(rsync_acl *racl, SMB_ACL_TYPE_T type, item_list *racl_list)
780 else if ((ndx = find_matching_rsync_acl(racl, type, racl_list)) == -1) {
782 ndx = racl_list->count;
783 new_duo = EXPAND_ITEM_LIST(racl_list, acl_duo, 1000);
784 new_duo->racl = *racl;
785 new_duo->sacl = NULL;
786 *racl = empty_rsync_acl;
792 /* Turn the ACL data in stat_x into cached ACL data, setting the index
793 * values in the file struct. */
794 void cache_tmp_acl(struct file_struct *file, stat_x *sxp)
796 if (prior_access_count == (size_t)-1)
797 prior_access_count = access_acl_list.count;
799 F_ACL(file) = cache_rsync_acl(sxp->acc_acl,
800 SMB_ACL_TYPE_ACCESS, &access_acl_list);
802 if (S_ISDIR(sxp->st.st_mode)) {
803 if (prior_default_count == (size_t)-1)
804 prior_default_count = default_acl_list.count;
805 F_DIR_DEFACL(file) = cache_rsync_acl(sxp->def_acl,
806 SMB_ACL_TYPE_DEFAULT, &default_acl_list);
810 static void uncache_duo_acls(item_list *duo_list, size_t start)
812 acl_duo *duo_item = duo_list->items;
813 acl_duo *duo_start = duo_item + start;
815 duo_item += duo_list->count;
816 duo_list->count = start;
818 while (duo_item-- > duo_start) {
819 rsync_acl_free(&duo_item->racl);
821 sys_acl_free_acl(duo_item->sacl);
825 void uncache_tmp_acls(void)
827 if (prior_access_count != (size_t)-1) {
828 uncache_duo_acls(&access_acl_list, prior_access_count);
829 prior_access_count = (size_t)-1;
832 if (prior_default_count != (size_t)-1) {
833 uncache_duo_acls(&default_acl_list, prior_default_count);
834 prior_default_count = (size_t)-1;
838 #ifndef HAVE_OSX_ACLS
839 static mode_t change_sacl_perms(SMB_ACL_T sacl, rsync_acl *racl, mode_t old_mode, mode_t mode)
841 SMB_ACL_ENTRY_T entry;
846 /* If the sticky bit is going on, it's not safe to allow all
847 * the new ACL to go into effect before it gets set. */
848 #ifdef SMB_ACL_LOSES_SPECIAL_MODE_BITS
852 if (mode & S_ISVTX && !(old_mode & S_ISVTX))
855 /* If setuid or setgid is going off, it's not safe to allow all
856 * the new ACL to go into effect before they get cleared. */
857 if ((old_mode & S_ISUID && !(mode & S_ISUID))
858 || (old_mode & S_ISGID && !(mode & S_ISGID)))
863 errfun = "sys_acl_get_entry";
864 for (rc = sys_acl_get_entry(sacl, SMB_ACL_FIRST_ENTRY, &entry);
866 rc = sys_acl_get_entry(sacl, SMB_ACL_NEXT_ENTRY, &entry)) {
867 SMB_ACL_TAG_T tag_type;
868 if ((rc = sys_acl_get_tag_type(entry, &tag_type)) != 0) {
869 errfun = "sys_acl_get_tag_type";
873 case SMB_ACL_USER_OBJ:
874 COE2( store_access_in_entry,((mode >> 6) & 7, entry) );
876 case SMB_ACL_GROUP_OBJ:
877 /* group is only empty when identical to group perms. */
878 if (racl->group_obj != NO_ENTRY)
880 COE2( store_access_in_entry,((mode >> 3) & 7, entry) );
883 #ifndef ACLS_NEED_MASK
884 /* mask is only empty when we don't need it. */
885 if (racl->mask_obj == NO_ENTRY)
888 COE2( store_access_in_entry,((mode >> 3) & 7, entry) );
891 COE2( store_access_in_entry,(mode & 7, entry) );
898 rsyserr(FERROR_XFER, errno, "change_sacl_perms: %s()",
904 #ifdef SMB_ACL_LOSES_SPECIAL_MODE_BITS
905 /* Ensure that chmod() will be called to restore any lost setid bits. */
906 if (old_mode & (S_ISUID | S_ISGID | S_ISVTX)
907 && BITS_EQUAL(old_mode, mode, CHMOD_BITS))
908 old_mode &= ~(S_ISUID | S_ISGID | S_ISVTX);
911 /* Return the mode of the file on disk, as we will set them. */
912 return (old_mode & ~ACCESSPERMS) | (mode & ACCESSPERMS);
916 static int set_rsync_acl(const char *fname, acl_duo *duo_item,
917 SMB_ACL_TYPE_T type, stat_x *sxp, mode_t mode)
919 if (type == SMB_ACL_TYPE_DEFAULT
920 && duo_item->racl.user_obj == NO_ENTRY) {
922 #ifdef SUPPORT_XATTRS
923 /* --fake-super support: delete default ACL from xattrs. */
925 rc = del_def_xattr_acl(fname);
928 rc = sys_acl_delete_def_file(fname);
930 rsyserr(FERROR_XFER, errno, "set_acl: sys_acl_delete_def_file(%s)",
934 #ifdef SUPPORT_XATTRS
935 } else if (am_root < 0) {
936 /* --fake-super support: store ACLs in an xattr. */
937 int cnt = duo_item->racl.names.count;
938 size_t len = 4*4 + cnt * (4+4);
939 char *buf = new_array(char, len);
942 SIVAL(buf, 0, duo_item->racl.user_obj);
943 SIVAL(buf, 4, duo_item->racl.group_obj);
944 SIVAL(buf, 8, duo_item->racl.mask_obj);
945 SIVAL(buf, 12, duo_item->racl.other_obj);
948 char *bp = buf + 4*4;
949 id_access *ida = duo_item->racl.names.idas;
950 for ( ; cnt--; ida++, bp += 4+4) {
951 SIVAL(bp, 0, ida->id);
952 SIVAL(bp, 4, ida->access);
955 rc = set_xattr_acl(fname, type == SMB_ACL_TYPE_ACCESS, buf, len);
960 mode_t cur_mode = sxp->st.st_mode;
962 && !pack_smb_acl(&duo_item->sacl, &duo_item->racl))
965 mode = 0; /* eliminate compiler warning */
967 if (type == SMB_ACL_TYPE_ACCESS) {
968 cur_mode = change_sacl_perms(duo_item->sacl, &duo_item->racl,
970 if (cur_mode == (mode_t)~0)
974 if (sys_acl_set_file(fname, type, duo_item->sacl) < 0) {
975 rsyserr(FERROR_XFER, errno, "set_acl: sys_acl_set_file(%s, %s)",
976 fname, str_acl_type(type));
979 if (type == SMB_ACL_TYPE_ACCESS)
980 sxp->st.st_mode = cur_mode;
986 /* Set ACL on indicated filename.
988 * This sets extended access ACL entries and default ACL. If convenient,
989 * it sets permission bits along with the access ACL and signals having
990 * done so by modifying sxp->st.st_mode.
992 * Returns 1 for unchanged, 0 for changed, -1 for failed. Call this
993 * with fname set to NULL to just check if the ACL is unchanged. */
994 int set_acl(const char *fname, const struct file_struct *file, stat_x *sxp)
1000 if (!dry_run && (read_only || list_only)) {
1006 if (ndx >= 0 && (size_t)ndx < access_acl_list.count) {
1007 acl_duo *duo_item = access_acl_list.items;
1010 && rsync_acl_equal_enough(sxp->acc_acl, &duo_item->racl, file->mode);
1013 if (!dry_run && fname
1014 && set_rsync_acl(fname, duo_item, SMB_ACL_TYPE_ACCESS,
1015 sxp, file->mode) < 0)
1020 if (!S_ISDIR(sxp->st.st_mode))
1023 ndx = F_DIR_DEFACL(file);
1024 if (ndx >= 0 && (size_t)ndx < default_acl_list.count) {
1025 acl_duo *duo_item = default_acl_list.items;
1027 eq = sxp->def_acl && rsync_acl_equal(sxp->def_acl, &duo_item->racl);
1031 if (!dry_run && fname
1032 && set_rsync_acl(fname, duo_item, SMB_ACL_TYPE_DEFAULT,
1033 sxp, file->mode) < 0)
1041 /* Non-incremental recursion needs to convert all the received IDs.
1042 * This is done in a single pass after receiving the whole file-list. */
1043 static void match_racl_ids(const item_list *racl_list)
1045 int list_cnt, name_cnt;
1046 acl_duo *duo_item = racl_list->items;
1047 for (list_cnt = racl_list->count; list_cnt--; duo_item++) {
1048 ida_entries *idal = &duo_item->racl.names;
1049 id_access *ida = idal->idas;
1050 for (name_cnt = idal->count; name_cnt--; ida++) {
1051 if (ida->access & NAME_IS_USER)
1052 ida->id = match_uid(ida->id);
1054 ida->id = match_gid(ida->id, NULL);
1059 void match_acl_ids(void)
1061 match_racl_ids(&access_acl_list);
1062 match_racl_ids(&default_acl_list);
1065 /* This is used by dest_mode(). */
1066 int default_perms_for_dir(const char *dir)
1075 perms = ACCESSPERMS & ~orig_umask;
1076 /* Read the directory's default ACL. If it has none, this will successfully return an empty ACL. */
1077 sacl = sys_acl_get_file(dir, SMB_ACL_TYPE_DEFAULT);
1079 /* Couldn't get an ACL. Darn. */
1085 /* No ACLs are available. */
1089 /* We're doing a dry run, so the containing directory
1090 * wasn't actually created. Don't worry about it. */
1093 /* Otherwise fall through. */
1096 "default_perms_for_dir: sys_acl_get_file(%s, %s): %s, falling back on umask\n",
1097 dir, str_acl_type(SMB_ACL_TYPE_DEFAULT), strerror(errno));
1103 racl = empty_rsync_acl;
1104 ok = unpack_smb_acl(sacl, &racl);
1105 sys_acl_free_acl(sacl);
1107 rprintf(FWARNING, "default_perms_for_dir: unpack_smb_acl failed, falling back on umask\n");
1111 /* Apply the permission-bit entries of the default ACL, if any. */
1112 if (racl.user_obj != NO_ENTRY) {
1113 perms = rsync_acl_get_perms(&racl);
1114 if (DEBUG_GTE(ACL, 1))
1115 rprintf(FINFO, "got ACL-based default perms %o for directory %s\n", perms, dir);
1118 rsync_acl_free(&racl);
1122 #endif /* SUPPORT_ACLS */