2 * Store Windows ACLs in xattrs.
4 * Copyright (C) Volker Lendecke, 2008
5 * Copyright (C) Jeremy Allison, 2008
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 3 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, see <http://www.gnu.org/licenses/>.
21 /* NOTE: This is an experimental module, not yet finished. JRA. */
24 #include "librpc/gen_ndr/xattr.h"
25 #include "librpc/gen_ndr/ndr_xattr.h"
28 #define DBGC_CLASS DBGC_VFS
30 /*******************************************************************
31 Parse out a struct security_descriptor from a DATA_BLOB.
32 *******************************************************************/
34 static NTSTATUS
parse_acl_blob(const DATA_BLOB
*pblob
,
36 struct security_descriptor
**ppdesc
)
38 TALLOC_CTX
*ctx
= talloc_tos();
39 struct xattr_NTACL xacl
;
40 enum ndr_err_code ndr_err
;
43 ndr_err
= ndr_pull_struct_blob(pblob
, ctx
, NULL
, &xacl
,
44 (ndr_pull_flags_fn_t
)ndr_pull_xattr_NTACL
);
46 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err
)) {
47 DEBUG(5, ("parse_acl_blob: ndr_pull_xattr_NTACL failed: %s\n",
48 ndr_errstr(ndr_err
)));
49 return ndr_map_error2ntstatus(ndr_err
);;
52 if (xacl
.version
!= 2) {
53 return NT_STATUS_REVISION_MISMATCH
;
56 *ppdesc
= make_sec_desc(ctx
, SEC_DESC_REVISION
, xacl
.info
.sd_hs
->sd
->type
| SEC_DESC_SELF_RELATIVE
,
57 (security_info
& OWNER_SECURITY_INFORMATION
)
58 ? xacl
.info
.sd_hs
->sd
->owner_sid
: NULL
,
59 (security_info
& GROUP_SECURITY_INFORMATION
)
60 ? xacl
.info
.sd_hs
->sd
->group_sid
: NULL
,
61 (security_info
& SACL_SECURITY_INFORMATION
)
62 ? xacl
.info
.sd_hs
->sd
->sacl
: NULL
,
63 (security_info
& DACL_SECURITY_INFORMATION
)
64 ? xacl
.info
.sd_hs
->sd
->dacl
: NULL
,
67 TALLOC_FREE(xacl
.info
.sd
);
69 return (*ppdesc
!= NULL
) ? NT_STATUS_OK
: NT_STATUS_NO_MEMORY
;
72 /*******************************************************************
73 Pull a security descriptor into a DATA_BLOB from a xattr.
74 *******************************************************************/
76 static NTSTATUS
get_acl_blob(TALLOC_CTX
*ctx
,
77 vfs_handle_struct
*handle
,
92 tmp
= TALLOC_REALLOC_ARRAY(ctx
, val
, uint8_t, size
);
95 return NT_STATUS_NO_MEMORY
;
100 if (fsp
&& fsp
->fh
->fd
!= -1) {
101 sizeret
= SMB_VFS_FGETXATTR(fsp
, XATTR_NTACL_NAME
, val
, size
);
103 sizeret
= SMB_VFS_GETXATTR(handle
->conn
, name
,
104 XATTR_NTACL_NAME
, val
, size
);
111 /* Max ACL size is 65536 bytes. */
114 if ((errno
== ERANGE
) && (size
!= 65536)) {
115 /* Too small, try again. */
120 /* Real error - exit here. */
122 return map_nt_error_from_unix(errno
);
126 pblob
->length
= sizeret
;
130 /*******************************************************************
131 Create a DATA_BLOB from a security descriptor.
132 *******************************************************************/
134 static NTSTATUS
create_acl_blob(const struct security_descriptor
*psd
, DATA_BLOB
*pblob
)
136 struct xattr_NTACL xacl
;
137 struct security_descriptor_hash sd_hs
;
138 enum ndr_err_code ndr_err
;
139 TALLOC_CTX
*ctx
= talloc_tos();
145 xacl
.info
.sd_hs
= &sd_hs
;
146 xacl
.info
.sd_hs
->sd
= CONST_DISCARD(struct security_descriptor
*, psd
);
147 memset(&xacl
.info
.sd_hs
->hash
[0], '\0', 16);
149 ndr_err
= ndr_push_struct_blob(
150 pblob
, ctx
, NULL
, &xacl
,
151 (ndr_push_flags_fn_t
)ndr_push_xattr_NTACL
);
153 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err
)) {
154 DEBUG(5, ("create_acl_blob: ndr_push_xattr_NTACL failed: %s\n",
155 ndr_errstr(ndr_err
)));
156 return ndr_map_error2ntstatus(ndr_err
);;
162 /*******************************************************************
163 Store a DATA_BLOB into an xattr given an fsp pointer.
164 *******************************************************************/
166 static NTSTATUS
store_acl_blob_fsp(vfs_handle_struct
*handle
,
173 DEBUG(10,("store_acl_blob_fsp: storing blob length %u on file %s\n",
174 (unsigned int)pblob
->length
, fsp
->fsp_name
));
177 if (fsp
->fh
->fd
!= -1) {
178 ret
= SMB_VFS_FSETXATTR(fsp
, XATTR_NTACL_NAME
,
179 pblob
->data
, pblob
->length
, 0);
181 ret
= SMB_VFS_SETXATTR(fsp
->conn
, fsp
->fsp_name
,
183 pblob
->data
, pblob
->length
, 0);
191 DEBUG(5, ("store_acl_blob_fsp: setting attr failed for file %s"
195 return map_nt_error_from_unix(errno
);
200 /*******************************************************************
201 Store a DATA_BLOB into an xattr given a pathname.
202 *******************************************************************/
204 static NTSTATUS
store_acl_blob_pathname(vfs_handle_struct
*handle
,
208 connection_struct
*conn
= handle
->conn
;
212 DEBUG(10,("store_acl_blob_pathname: storing blob "
213 "length %u on file %s\n",
214 (unsigned int)pblob
->length
, fname
));
217 ret
= SMB_VFS_SETXATTR(conn
, fname
,
219 pblob
->data
, pblob
->length
, 0);
226 DEBUG(5, ("store_acl_blob_pathname: setting attr failed "
227 "for file %s with error %s\n",
230 return map_nt_error_from_unix(errno
);
235 /*******************************************************************
236 Store a DATA_BLOB into an xattr given a pathname.
237 *******************************************************************/
239 static NTSTATUS
get_nt_acl_xattr_internal(vfs_handle_struct
*handle
,
242 uint32 security_info
,
243 struct security_descriptor
**ppdesc
)
245 TALLOC_CTX
*ctx
= talloc_tos();
249 if (fsp
&& name
== NULL
) {
250 name
= fsp
->fsp_name
;
253 DEBUG(10, ("get_nt_acl_xattr_internal: name=%s\n", name
));
255 status
= get_acl_blob(ctx
, handle
, fsp
, name
, &blob
);
256 if (!NT_STATUS_IS_OK(status
)) {
257 DEBUG(10, ("get_acl_blob returned %s\n", nt_errstr(status
)));
261 status
= parse_acl_blob(&blob
, security_info
, ppdesc
);
262 if (!NT_STATUS_IS_OK(status
)) {
263 DEBUG(10, ("parse_acl_blob returned %s\n",
268 TALLOC_FREE(blob
.data
);
272 /*********************************************************************
273 Create a default security descriptor for a file in case no inheritance
274 exists. All permissions to the owner and SYSTEM.
275 *********************************************************************/
277 static struct security_descriptor
*default_file_sd(TALLOC_CTX
*mem_ctx
,
278 SMB_STRUCT_STAT
*psbuf
)
280 struct dom_sid owner_sid
, group_sid
;
282 struct security_ace
*pace
= NULL
;
283 struct security_acl
*pacl
= NULL
;
285 uid_to_sid(&owner_sid
, psbuf
->st_uid
);
286 gid_to_sid(&group_sid
, psbuf
->st_gid
);
288 pace
= TALLOC_ARRAY(mem_ctx
, struct security_ace
, 2);
293 init_sec_ace(&pace
[0], &owner_sid
, SEC_ACE_TYPE_ACCESS_ALLOWED
,
294 SEC_RIGHTS_FILE_ALL
, 0);
295 init_sec_ace(&pace
[1], &global_sid_System
, SEC_ACE_TYPE_ACCESS_ALLOWED
,
296 SEC_RIGHTS_FILE_ALL
, 0);
298 pacl
= make_sec_acl(mem_ctx
,
305 return make_sec_desc(mem_ctx
,
306 SECURITY_DESCRIPTOR_REVISION_1
,
307 SEC_DESC_SELF_RELATIVE
|SEC_DESC_DACL_PRESENT
,
315 /*********************************************************************
316 *********************************************************************/
318 static NTSTATUS
inherit_new_acl(vfs_handle_struct
*handle
,
323 TALLOC_CTX
*ctx
= talloc_tos();
325 struct security_descriptor
*parent_desc
= NULL
;
326 struct security_descriptor
*psd
= NULL
;
331 if (!parent_dirname_talloc(ctx
,
335 return NT_STATUS_NO_MEMORY
;
338 DEBUG(10,("inherit_new_acl: check directory %s\n",
341 status
= get_nt_acl_xattr_internal(handle
,
344 (OWNER_SECURITY_INFORMATION
|
345 GROUP_SECURITY_INFORMATION
|
346 DACL_SECURITY_INFORMATION
),
348 if (NT_STATUS_IS_OK(status
)) {
349 /* Create an inherited descriptor from the parent. */
351 if (DEBUGLEVEL
>= 10) {
352 DEBUG(10,("inherit_new_acl: parent acl is:\n"));
353 NDR_PRINT_DEBUG(security_descriptor
, parent_desc
);
356 status
= se_create_child_secdesc(ctx
,
360 &handle
->conn
->server_info
->ptok
->user_sids
[PRIMARY_USER_SID_INDEX
],
361 &handle
->conn
->server_info
->ptok
->user_sids
[PRIMARY_GROUP_SID_INDEX
],
363 if (!NT_STATUS_IS_OK(status
)) {
367 if (DEBUGLEVEL
>= 10) {
368 DEBUG(10,("inherit_new_acl: child acl is:\n"));
369 NDR_PRINT_DEBUG(security_descriptor
, psd
);
373 DEBUG(10,("inherit_new_acl: directory %s failed "
376 nt_errstr(status
) ));
379 if (!psd
|| psd
->dacl
== NULL
) {
380 SMB_STRUCT_STAT sbuf
;
384 if (fsp
&& !fsp
->is_directory
&& fsp
->fh
->fd
!= -1) {
385 ret
= SMB_VFS_FSTAT(fsp
, &sbuf
);
387 ret
= SMB_VFS_STAT(handle
->conn
,fname
, &sbuf
);
390 return map_nt_error_from_unix(errno
);
392 psd
= default_file_sd(ctx
, &sbuf
);
394 return NT_STATUS_NO_MEMORY
;
397 if (DEBUGLEVEL
>= 10) {
398 DEBUG(10,("inherit_new_acl: default acl is:\n"));
399 NDR_PRINT_DEBUG(security_descriptor
, psd
);
403 status
= create_acl_blob(psd
, &blob
);
404 if (!NT_STATUS_IS_OK(status
)) {
408 return store_acl_blob_fsp(handle
, fsp
, &blob
);
410 return store_acl_blob_pathname(handle
, fname
, &blob
);
414 /*********************************************************************
415 Check ACL on open. For new files inherit from parent directory.
416 *********************************************************************/
418 static int open_acl_xattr(vfs_handle_struct
*handle
,
424 uint32_t access_granted
= 0;
425 struct security_descriptor
*pdesc
= NULL
;
426 bool file_existed
= true;
427 NTSTATUS status
= get_nt_acl_xattr_internal(handle
,
430 (OWNER_SECURITY_INFORMATION
|
431 GROUP_SECURITY_INFORMATION
|
432 DACL_SECURITY_INFORMATION
),
434 if (NT_STATUS_IS_OK(status
)) {
435 /* See if we can access it. */
436 status
= smb1_file_se_access_check(pdesc
,
437 handle
->conn
->server_info
->ptok
,
440 if (!NT_STATUS_IS_OK(status
)) {
441 DEBUG(10,("open_acl_xattr: file %s open "
442 "refused with error %s\n",
444 nt_errstr(status
) ));
445 errno
= map_errno_from_nt_status(status
);
448 } else if (NT_STATUS_EQUAL(status
,NT_STATUS_OBJECT_NAME_NOT_FOUND
)) {
449 file_existed
= false;
452 DEBUG(10,("open_acl_xattr: get_nt_acl_attr_internal for "
453 "file %s returned %s\n",
455 nt_errstr(status
) ));
457 fsp
->fh
->fd
= SMB_VFS_NEXT_OPEN(handle
, fname
, fsp
, flags
, mode
);
459 if (!file_existed
&& fsp
->fh
->fd
!= -1) {
460 /* File was created. Inherit from parent directory. */
461 string_set(&fsp
->fsp_name
, fname
);
462 inherit_new_acl(handle
, fname
, fsp
, false);
468 static int mkdir_acl_xattr(vfs_handle_struct
*handle
, const char *path
, mode_t mode
)
470 int ret
= SMB_VFS_NEXT_MKDIR(handle
, path
, mode
);
475 /* New directory - inherit from parent. */
476 inherit_new_acl(handle
, path
, NULL
, true);
480 /*********************************************************************
481 Fetch a security descriptor given an fsp.
482 *********************************************************************/
484 static NTSTATUS
fget_nt_acl_xattr(vfs_handle_struct
*handle
, files_struct
*fsp
,
485 uint32 security_info
, struct security_descriptor
**ppdesc
)
487 NTSTATUS status
= get_nt_acl_xattr_internal(handle
, fsp
,
488 NULL
, security_info
, ppdesc
);
489 if (NT_STATUS_IS_OK(status
)) {
490 if (DEBUGLEVEL
>= 10) {
491 DEBUG(10,("fget_nt_acl_xattr: returning xattr sd for file %s\n",
493 NDR_PRINT_DEBUG(security_descriptor
, *ppdesc
);
498 DEBUG(10,("fget_nt_acl_xattr: failed to get xattr sd for file %s, Error %s\n",
500 nt_errstr(status
) ));
502 return SMB_VFS_NEXT_FGET_NT_ACL(handle
, fsp
,
503 security_info
, ppdesc
);
506 /*********************************************************************
507 Fetch a security descriptor given a pathname.
508 *********************************************************************/
510 static NTSTATUS
get_nt_acl_xattr(vfs_handle_struct
*handle
,
511 const char *name
, uint32 security_info
, struct security_descriptor
**ppdesc
)
513 NTSTATUS status
= get_nt_acl_xattr_internal(handle
, NULL
,
514 name
, security_info
, ppdesc
);
515 if (NT_STATUS_IS_OK(status
)) {
516 if (DEBUGLEVEL
>= 10) {
517 DEBUG(10,("get_nt_acl_xattr: returning xattr sd for file %s\n",
519 NDR_PRINT_DEBUG(security_descriptor
, *ppdesc
);
524 DEBUG(10,("get_nt_acl_xattr: failed to get xattr sd for file %s, Error %s\n",
526 nt_errstr(status
) ));
528 return SMB_VFS_NEXT_GET_NT_ACL(handle
, name
,
529 security_info
, ppdesc
);
532 /*********************************************************************
533 Store a security descriptor given an fsp.
534 *********************************************************************/
536 static NTSTATUS
fset_nt_acl_xattr(vfs_handle_struct
*handle
, files_struct
*fsp
,
537 uint32 security_info_sent
, const struct security_descriptor
*psd
)
542 if (DEBUGLEVEL
>= 10) {
543 DEBUG(10,("fset_nt_acl_xattr: incoming sd for file %s\n",
545 NDR_PRINT_DEBUG(security_descriptor
,
546 CONST_DISCARD(struct security_descriptor
*,psd
));
549 status
= SMB_VFS_NEXT_FSET_NT_ACL(handle
, fsp
, security_info_sent
, psd
);
550 if (!NT_STATUS_IS_OK(status
)) {
554 /* Ensure owner and group are set. */
555 if (!psd
->owner_sid
|| !psd
->group_sid
) {
557 SMB_STRUCT_STAT sbuf
;
558 DOM_SID owner_sid
, group_sid
;
559 struct security_descriptor
*nc_psd
= dup_sec_desc(talloc_tos(), psd
);
564 if (fsp
->is_directory
|| fsp
->fh
->fd
== -1) {
565 ret
= SMB_VFS_STAT(fsp
->conn
,fsp
->fsp_name
, &sbuf
);
567 ret
= SMB_VFS_FSTAT(fsp
, &sbuf
);
570 /* Lower level acl set succeeded,
571 * so still return OK. */
574 create_file_sids(&sbuf
, &owner_sid
, &group_sid
);
575 /* This is safe as nc_psd is discarded at fn exit. */
576 nc_psd
->owner_sid
= &owner_sid
;
577 nc_psd
->group_sid
= &group_sid
;
578 security_info_sent
|= (OWNER_SECURITY_INFORMATION
|GROUP_SECURITY_INFORMATION
);
582 if ((security_info_sent
& DACL_SECURITY_INFORMATION
) &&
584 (psd
->type
& (SE_DESC_DACL_AUTO_INHERITED
|
585 SE_DESC_DACL_AUTO_INHERIT_REQ
))==
586 (SE_DESC_DACL_AUTO_INHERITED
|
587 SE_DESC_DACL_AUTO_INHERIT_REQ
) ) {
588 struct security_descriptor
*new_psd
= NULL
;
589 status
= append_parent_acl(fsp
, psd
, &new_psd
);
590 if (!NT_STATUS_IS_OK(status
)) {
591 /* Lower level acl set succeeded,
592 * so still return OK. */
598 if (DEBUGLEVEL
>= 10) {
599 DEBUG(10,("fset_nt_acl_xattr: storing xattr sd for file %s\n",
601 NDR_PRINT_DEBUG(security_descriptor
,
602 CONST_DISCARD(struct security_descriptor
*,psd
));
604 create_acl_blob(psd
, &blob
);
605 store_acl_blob_fsp(handle
, fsp
, &blob
);
610 /*********************************************************************
611 Remove a Windows ACL - we're setting the underlying POSIX ACL.
612 *********************************************************************/
614 static int sys_acl_set_file_xattr(vfs_handle_struct
*handle
,
619 int ret
= SMB_VFS_NEXT_SYS_ACL_SET_FILE(handle
,
628 SMB_VFS_REMOVEXATTR(handle
, name
, XATTR_NTACL_NAME
);
634 /*********************************************************************
635 Remove a Windows ACL - we're setting the underlying POSIX ACL.
636 *********************************************************************/
638 static int sys_acl_set_fd_xattr(vfs_handle_struct
*handle
,
642 int ret
= SMB_VFS_NEXT_SYS_ACL_SET_FD(handle
,
650 SMB_VFS_FREMOVEXATTR(handle
, fsp
, XATTR_NTACL_NAME
);
656 /*********************************************************************
657 Remove a Windows ACL - we're setting the underlying POSIX ACL.
658 *********************************************************************/
660 static int sys_acl_set_file_xattr(vfs_handle_struct
*handle
,
665 int ret
= SMB_VFS_NEXT_SYS_ACL_SET_FILE(handle
,
674 SMB_VFS_REMOVEXATTR(handle
->conn
, name
, XATTR_NTACL_NAME
);
680 /*********************************************************************
681 Remove a Windows ACL - we're setting the underlying POSIX ACL.
682 *********************************************************************/
684 static int sys_acl_set_fd_xattr(vfs_handle_struct
*handle
,
688 int ret
= SMB_VFS_NEXT_SYS_ACL_SET_FD(handle
,
696 SMB_VFS_FREMOVEXATTR(fsp
, XATTR_NTACL_NAME
);
702 /* VFS operations structure */
704 static vfs_op_tuple skel_op_tuples
[] =
706 {SMB_VFS_OP(mkdir_acl_xattr
), SMB_VFS_OP_MKDIR
, SMB_VFS_LAYER_TRANSPARENT
},
707 {SMB_VFS_OP(open_acl_xattr
), SMB_VFS_OP_OPEN
, SMB_VFS_LAYER_TRANSPARENT
},
709 /* NT File ACL operations */
711 {SMB_VFS_OP(fget_nt_acl_xattr
),SMB_VFS_OP_FGET_NT_ACL
,SMB_VFS_LAYER_TRANSPARENT
},
712 {SMB_VFS_OP(get_nt_acl_xattr
), SMB_VFS_OP_GET_NT_ACL
, SMB_VFS_LAYER_TRANSPARENT
},
713 {SMB_VFS_OP(fset_nt_acl_xattr
),SMB_VFS_OP_FSET_NT_ACL
,SMB_VFS_LAYER_TRANSPARENT
},
715 /* POSIX ACL operations. */
716 {SMB_VFS_OP(sys_acl_set_file_xattr
), SMB_VFS_OP_SYS_ACL_SET_FILE
, SMB_VFS_LAYER_TRANSPARENT
},
717 {SMB_VFS_OP(sys__acl_set_fd_xattr
), SMB_VFS_OP_SYS_ACL_SET_FD
, SMB_VFS_LAYER_TRANSPARENT
},
719 /* POSIX ACL operations. */
720 {SMB_VFS_OP(sys_acl_set_file_xattr
), SMB_VFS_OP_SYS_ACL_SET_FILE
, SMB_VFS_LAYER_TRANSPARENT
},
721 {SMB_VFS_OP(sys_acl_set_fd_xattr
), SMB_VFS_OP_SYS_ACL_SET_FD
, SMB_VFS_LAYER_TRANSPARENT
},
723 {SMB_VFS_OP(NULL
), SMB_VFS_OP_NOOP
, SMB_VFS_LAYER_NOOP
}
726 NTSTATUS
vfs_acl_xattr_init(void)
728 return smb_register_vfs(SMB_VFS_INTERFACE_VERSION
, "acl_xattr", skel_op_tuples
);