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);
583 if ((security_info_sent & DACL_SECURITY_INFORMATION) &&
585 (psd->type & (SE_DESC_DACL_AUTO_INHERITED|
586 SE_DESC_DACL_AUTO_INHERIT_REQ))==
587 (SE_DESC_DACL_AUTO_INHERITED|
588 SE_DESC_DACL_AUTO_INHERIT_REQ) ) {
589 struct security_descriptor *new_psd = NULL;
590 status = append_parent_acl(fsp, psd, &new_psd);
591 if (!NT_STATUS_IS_OK(status)) {
592 /* Lower level acl set succeeded,
593 * so still return OK. */
600 if (DEBUGLEVEL >= 10) {
601 DEBUG(10,("fset_nt_acl_xattr: storing xattr sd for file %s\n",
603 NDR_PRINT_DEBUG(security_descriptor,
604 CONST_DISCARD(struct security_descriptor *,psd));
606 create_acl_blob(psd, &blob);
607 store_acl_blob_fsp(handle, fsp, &blob);
612 /*********************************************************************
613 Remove a Windows ACL - we're setting the underlying POSIX ACL.
614 *********************************************************************/
616 static int sys_acl_set_file_xattr(vfs_handle_struct *handle,
621 int ret = SMB_VFS_NEXT_SYS_ACL_SET_FILE(handle,
630 SMB_VFS_REMOVEXATTR(handle->conn, name, XATTR_NTACL_NAME);
636 /*********************************************************************
637 Remove a Windows ACL - we're setting the underlying POSIX ACL.
638 *********************************************************************/
640 static int sys_acl_set_fd_xattr(vfs_handle_struct *handle,
644 int ret = SMB_VFS_NEXT_SYS_ACL_SET_FD(handle,
652 SMB_VFS_FREMOVEXATTR(fsp, XATTR_NTACL_NAME);
658 /* VFS operations structure */
660 static vfs_op_tuple skel_op_tuples[] =
662 {SMB_VFS_OP(mkdir_acl_xattr), SMB_VFS_OP_MKDIR, SMB_VFS_LAYER_TRANSPARENT},
663 {SMB_VFS_OP(open_acl_xattr), SMB_VFS_OP_OPEN, SMB_VFS_LAYER_TRANSPARENT},
665 /* NT File ACL operations */
667 {SMB_VFS_OP(fget_nt_acl_xattr),SMB_VFS_OP_FGET_NT_ACL,SMB_VFS_LAYER_TRANSPARENT},
668 {SMB_VFS_OP(get_nt_acl_xattr), SMB_VFS_OP_GET_NT_ACL, SMB_VFS_LAYER_TRANSPARENT},
669 {SMB_VFS_OP(fset_nt_acl_xattr),SMB_VFS_OP_FSET_NT_ACL,SMB_VFS_LAYER_TRANSPARENT},
671 /* POSIX ACL operations. */
672 {SMB_VFS_OP(sys_acl_set_file_xattr), SMB_VFS_OP_SYS_ACL_SET_FILE, SMB_VFS_LAYER_TRANSPARENT},
673 {SMB_VFS_OP(sys_acl_set_fd_xattr), SMB_VFS_OP_SYS_ACL_SET_FD, SMB_VFS_LAYER_TRANSPARENT},
675 {SMB_VFS_OP(NULL), SMB_VFS_OP_NOOP, SMB_VFS_LAYER_NOOP}
678 NTSTATUS vfs_acl_xattr_init(void)
680 return smb_register_vfs(SMB_VFS_INTERFACE_VERSION, "acl_xattr", skel_op_tuples);