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_ts->sd->type | SEC_DESC_SELF_RELATIVE,
57 (security_info & OWNER_SECURITY_INFORMATION)
58 ? xacl.info.sd_ts->sd->owner_sid : NULL,
59 (security_info & GROUP_SECURITY_INFORMATION)
60 ? xacl.info.sd_ts->sd->group_sid : NULL,
61 (security_info & SACL_SECURITY_INFORMATION)
62 ? xacl.info.sd_ts->sd->sacl : NULL,
63 (security_info & DACL_SECURITY_INFORMATION)
64 ? xacl.info.sd_ts->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_timestamp sd_ts;
138 enum ndr_err_code ndr_err;
139 TALLOC_CTX *ctx = talloc_tos();
140 struct timespec curr = timespec_current();
145 /* Horrid hack as setting an xattr changes the ctime
146 * on Linux. This gives a race of 1 second during
147 * which we would not see a POSIX ACL set.
152 xacl.info.sd_ts = &sd_ts;
153 xacl.info.sd_ts->sd = CONST_DISCARD(struct security_descriptor *, psd);
154 unix_timespec_to_nt_time(&xacl.info.sd_ts->last_changed, curr);
156 DEBUG(10, ("create_acl_blob: timestamp stored as %s\n",
157 timestring(ctx, curr.tv_sec) ));
159 ndr_err = ndr_push_struct_blob(
160 pblob, ctx, NULL, &xacl,
161 (ndr_push_flags_fn_t)ndr_push_xattr_NTACL);
163 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
164 DEBUG(5, ("create_acl_blob: ndr_push_xattr_NTACL failed: %s\n",
165 ndr_errstr(ndr_err)));
166 return ndr_map_error2ntstatus(ndr_err);;
172 /*******************************************************************
173 Store a DATA_BLOB into an xattr given an fsp pointer.
174 *******************************************************************/
176 static NTSTATUS store_acl_blob_fsp(vfs_handle_struct *handle,
183 DEBUG(10,("store_acl_blob_fsp: storing blob length %u on file %s\n",
184 (unsigned int)pblob->length, fsp->fsp_name));
187 if (fsp->fh->fd != -1) {
188 ret = SMB_VFS_FSETXATTR(fsp, XATTR_NTACL_NAME,
189 pblob->data, pblob->length, 0);
191 ret = SMB_VFS_SETXATTR(fsp->conn, fsp->fsp_name,
193 pblob->data, pblob->length, 0);
201 DEBUG(5, ("store_acl_blob_fsp: setting attr failed for file %s"
205 return map_nt_error_from_unix(errno);
210 /*******************************************************************
211 Store a DATA_BLOB into an xattr given a pathname.
212 *******************************************************************/
214 static NTSTATUS store_acl_blob_pathname(vfs_handle_struct *handle,
218 connection_struct *conn = handle->conn;
222 DEBUG(10,("store_acl_blob_pathname: storing blob "
223 "length %u on file %s\n",
224 (unsigned int)pblob->length, fname));
227 ret = SMB_VFS_SETXATTR(conn, fname,
229 pblob->data, pblob->length, 0);
236 DEBUG(5, ("store_acl_blob_pathname: setting attr failed "
237 "for file %s with error %s\n",
240 return map_nt_error_from_unix(errno);
245 /*******************************************************************
246 Store a DATA_BLOB into an xattr given a pathname.
247 *******************************************************************/
249 static NTSTATUS get_nt_acl_xattr_internal(vfs_handle_struct *handle,
252 uint32 security_info,
253 struct security_descriptor **ppdesc)
255 TALLOC_CTX *ctx = talloc_tos();
259 if (fsp && name == NULL) {
260 name = fsp->fsp_name;
263 DEBUG(10, ("get_nt_acl_xattr_internal: name=%s\n", name));
265 status = get_acl_blob(ctx, handle, fsp, name, &blob);
266 if (!NT_STATUS_IS_OK(status)) {
267 DEBUG(10, ("get_acl_blob returned %s\n", nt_errstr(status)));
271 status = parse_acl_blob(&blob, security_info, ppdesc);
272 if (!NT_STATUS_IS_OK(status)) {
273 DEBUG(10, ("parse_acl_blob returned %s\n",
278 TALLOC_FREE(blob.data);
282 /*********************************************************************
283 Create a default security descriptor for a file in case no inheritance
284 exists. All permissions to the owner and SYSTEM.
285 *********************************************************************/
287 static struct security_descriptor *default_file_sd(TALLOC_CTX *mem_ctx,
288 SMB_STRUCT_STAT *psbuf)
290 struct dom_sid owner_sid, group_sid;
292 struct security_ace *pace = NULL;
293 struct security_acl *pacl = NULL;
295 uid_to_sid(&owner_sid, psbuf->st_uid);
296 gid_to_sid(&group_sid, psbuf->st_gid);
298 pace = TALLOC_ARRAY(mem_ctx, struct security_ace, 2);
303 init_sec_ace(&pace[0], &owner_sid, SEC_ACE_TYPE_ACCESS_ALLOWED,
304 SEC_RIGHTS_FILE_ALL, 0);
305 init_sec_ace(&pace[1], &global_sid_System, SEC_ACE_TYPE_ACCESS_ALLOWED,
306 SEC_RIGHTS_FILE_ALL, 0);
308 pacl = make_sec_acl(mem_ctx,
315 return make_sec_desc(mem_ctx,
316 SECURITY_DESCRIPTOR_REVISION_1,
317 SEC_DESC_SELF_RELATIVE|SEC_DESC_DACL_PRESENT,
325 /*********************************************************************
326 *********************************************************************/
328 static NTSTATUS inherit_new_acl(vfs_handle_struct *handle,
333 TALLOC_CTX *ctx = talloc_tos();
335 struct security_descriptor *parent_desc = NULL;
336 struct security_descriptor *psd = NULL;
341 if (!parent_dirname_talloc(ctx,
345 return NT_STATUS_NO_MEMORY;
348 DEBUG(10,("inherit_new_acl: check directory %s\n",
351 status = get_nt_acl_xattr_internal(handle,
354 (OWNER_SECURITY_INFORMATION |
355 GROUP_SECURITY_INFORMATION |
356 DACL_SECURITY_INFORMATION),
358 if (NT_STATUS_IS_OK(status)) {
359 /* Create an inherited descriptor from the parent. */
361 if (DEBUGLEVEL >= 10) {
362 DEBUG(10,("inherit_new_acl: parent acl is:\n"));
363 NDR_PRINT_DEBUG(security_descriptor, parent_desc);
366 status = se_create_child_secdesc(ctx,
370 &handle->conn->server_info->ptok->user_sids[PRIMARY_USER_SID_INDEX],
371 &handle->conn->server_info->ptok->user_sids[PRIMARY_GROUP_SID_INDEX],
373 if (!NT_STATUS_IS_OK(status)) {
377 if (DEBUGLEVEL >= 10) {
378 DEBUG(10,("inherit_new_acl: child acl is:\n"));
379 NDR_PRINT_DEBUG(security_descriptor, psd);
383 DEBUG(10,("inherit_new_acl: directory %s failed "
386 nt_errstr(status) ));
389 if (!psd || psd->dacl == NULL) {
390 SMB_STRUCT_STAT sbuf;
394 if (fsp && !fsp->is_directory && fsp->fh->fd != -1) {
395 ret = SMB_VFS_FSTAT(fsp, &sbuf);
397 ret = SMB_VFS_STAT(handle->conn,fname, &sbuf);
400 return map_nt_error_from_unix(errno);
402 psd = default_file_sd(ctx, &sbuf);
404 return NT_STATUS_NO_MEMORY;
407 if (DEBUGLEVEL >= 10) {
408 DEBUG(10,("inherit_new_acl: default acl is:\n"));
409 NDR_PRINT_DEBUG(security_descriptor, psd);
413 status = create_acl_blob(psd, &blob);
414 if (!NT_STATUS_IS_OK(status)) {
418 return store_acl_blob_fsp(handle, fsp, &blob);
420 return store_acl_blob_pathname(handle, fname, &blob);
424 /*********************************************************************
425 Check ACL on open. For new files inherit from parent directory.
426 *********************************************************************/
428 static int open_acl_xattr(vfs_handle_struct *handle,
434 uint32_t access_granted = 0;
435 struct security_descriptor *pdesc = NULL;
436 bool file_existed = true;
437 NTSTATUS status = get_nt_acl_xattr_internal(handle,
440 (OWNER_SECURITY_INFORMATION |
441 GROUP_SECURITY_INFORMATION |
442 DACL_SECURITY_INFORMATION),
444 if (NT_STATUS_IS_OK(status)) {
445 /* See if we can access it. */
446 status = smb1_file_se_access_check(pdesc,
447 handle->conn->server_info->ptok,
450 if (!NT_STATUS_IS_OK(status)) {
451 DEBUG(10,("open_acl_xattr: file %s open "
452 "refused with error %s\n",
454 nt_errstr(status) ));
455 errno = map_errno_from_nt_status(status);
458 } else if (NT_STATUS_EQUAL(status,NT_STATUS_OBJECT_NAME_NOT_FOUND)) {
459 file_existed = false;
462 DEBUG(10,("open_acl_xattr: get_nt_acl_attr_internal for "
463 "file %s returned %s\n",
465 nt_errstr(status) ));
467 fsp->fh->fd = SMB_VFS_NEXT_OPEN(handle, fname, fsp, flags, mode);
469 if (!file_existed && fsp->fh->fd != -1) {
470 /* File was created. Inherit from parent directory. */
471 string_set(&fsp->fsp_name, fname);
472 inherit_new_acl(handle, fname, fsp, false);
478 static int mkdir_acl_xattr(vfs_handle_struct *handle, const char *path, mode_t mode)
480 int ret = SMB_VFS_NEXT_MKDIR(handle, path, mode);
485 /* New directory - inherit from parent. */
486 inherit_new_acl(handle, path, NULL, true);
490 /*********************************************************************
491 Fetch a security descriptor given an fsp.
492 *********************************************************************/
494 static NTSTATUS fget_nt_acl_xattr(vfs_handle_struct *handle, files_struct *fsp,
495 uint32 security_info, struct security_descriptor **ppdesc)
497 NTSTATUS status = get_nt_acl_xattr_internal(handle, fsp,
498 NULL, security_info, ppdesc);
499 if (NT_STATUS_IS_OK(status)) {
500 if (DEBUGLEVEL >= 10) {
501 DEBUG(10,("fget_nt_acl_xattr: returning xattr sd for file %s\n",
503 NDR_PRINT_DEBUG(security_descriptor, *ppdesc);
508 DEBUG(10,("fget_nt_acl_xattr: failed to get xattr sd for file %s, Error %s\n",
510 nt_errstr(status) ));
512 return SMB_VFS_NEXT_FGET_NT_ACL(handle, fsp,
513 security_info, ppdesc);
516 /*********************************************************************
517 Fetch a security descriptor given a pathname.
518 *********************************************************************/
520 static NTSTATUS get_nt_acl_xattr(vfs_handle_struct *handle,
521 const char *name, uint32 security_info, struct security_descriptor **ppdesc)
523 NTSTATUS status = get_nt_acl_xattr_internal(handle, NULL,
524 name, security_info, ppdesc);
525 if (NT_STATUS_IS_OK(status)) {
526 if (DEBUGLEVEL >= 10) {
527 DEBUG(10,("get_nt_acl_xattr: returning xattr sd for file %s\n",
529 NDR_PRINT_DEBUG(security_descriptor, *ppdesc);
534 DEBUG(10,("get_nt_acl_xattr: failed to get xattr sd for file %s, Error %s\n",
536 nt_errstr(status) ));
538 return SMB_VFS_NEXT_GET_NT_ACL(handle, name,
539 security_info, ppdesc);
542 /*********************************************************************
543 Store a security descriptor given an fsp.
544 *********************************************************************/
546 static NTSTATUS fset_nt_acl_xattr(vfs_handle_struct *handle, files_struct *fsp,
547 uint32 security_info_sent, const struct security_descriptor *psd)
552 if (DEBUGLEVEL >= 10) {
553 DEBUG(10,("fset_nt_acl_xattr: incoming sd for file %s\n",
555 NDR_PRINT_DEBUG(security_descriptor,
556 CONST_DISCARD(struct security_descriptor *,psd));
559 status = SMB_VFS_NEXT_FSET_NT_ACL(handle, fsp, security_info_sent, psd);
560 if (!NT_STATUS_IS_OK(status)) {
564 /* Ensure owner and group are set. */
565 if (!psd->owner_sid || !psd->group_sid) {
567 SMB_STRUCT_STAT sbuf;
568 DOM_SID owner_sid, group_sid;
569 struct security_descriptor *nc_psd = dup_sec_desc(talloc_tos(), psd);
574 if (fsp->is_directory || fsp->fh->fd == -1) {
575 ret = SMB_VFS_STAT(fsp->conn,fsp->fsp_name, &sbuf);
577 ret = SMB_VFS_FSTAT(fsp, &sbuf);
580 /* Lower level acl set succeeded,
581 * so still return OK. */
584 create_file_sids(&sbuf, &owner_sid, &group_sid);
585 /* This is safe as nc_psd is discarded at fn exit. */
586 nc_psd->owner_sid = &owner_sid;
587 nc_psd->group_sid = &group_sid;
588 security_info_sent |= (OWNER_SECURITY_INFORMATION|GROUP_SECURITY_INFORMATION);
592 if ((security_info_sent & DACL_SECURITY_INFORMATION) &&
594 (psd->type & (SE_DESC_DACL_AUTO_INHERITED|
595 SE_DESC_DACL_AUTO_INHERIT_REQ))==
596 (SE_DESC_DACL_AUTO_INHERITED|
597 SE_DESC_DACL_AUTO_INHERIT_REQ) ) {
598 struct security_descriptor *new_psd = NULL;
599 status = append_parent_acl(fsp, psd, &new_psd);
600 if (!NT_STATUS_IS_OK(status)) {
601 /* Lower level acl set succeeded,
602 * so still return OK. */
608 if (DEBUGLEVEL >= 10) {
609 DEBUG(10,("fset_nt_acl_xattr: storing xattr sd for file %s\n",
611 NDR_PRINT_DEBUG(security_descriptor,
612 CONST_DISCARD(struct security_descriptor *,psd));
614 create_acl_blob(psd, &blob);
615 store_acl_blob_fsp(handle, fsp, &blob);
620 /* VFS operations structure */
622 static vfs_op_tuple skel_op_tuples[] =
624 {SMB_VFS_OP(mkdir_acl_xattr), SMB_VFS_OP_MKDIR, SMB_VFS_LAYER_TRANSPARENT},
625 {SMB_VFS_OP(open_acl_xattr), SMB_VFS_OP_OPEN, SMB_VFS_LAYER_TRANSPARENT},
627 /* NT File ACL operations */
629 {SMB_VFS_OP(fget_nt_acl_xattr),SMB_VFS_OP_FGET_NT_ACL,SMB_VFS_LAYER_TRANSPARENT},
630 {SMB_VFS_OP(get_nt_acl_xattr), SMB_VFS_OP_GET_NT_ACL, SMB_VFS_LAYER_TRANSPARENT},
631 {SMB_VFS_OP(fset_nt_acl_xattr),SMB_VFS_OP_FSET_NT_ACL,SMB_VFS_LAYER_TRANSPARENT},
633 {SMB_VFS_OP(NULL), SMB_VFS_OP_NOOP, SMB_VFS_LAYER_NOOP}
636 NTSTATUS vfs_acl_xattr_init(void)
638 return smb_register_vfs(SMB_VFS_INTERFACE_VERSION, "acl_xattr", skel_op_tuples);