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/>.
22 #include "smbd/smbd.h"
23 #include "system/filesys.h"
24 #include "librpc/gen_ndr/xattr.h"
26 #include "vfs_acl_common.h"
28 /* Pull in the common functions. */
29 #define ACL_MODULE_NAME "acl_xattr"
32 #define DBGC_CLASS DBGC_VFS
34 /*******************************************************************
35 Pull a security descriptor into a DATA_BLOB from a xattr.
36 *******************************************************************/
38 static ssize_t getxattr_do(vfs_handle_struct *handle,
40 const struct smb_filename *smb_fname,
41 const char *xattr_name,
49 if (fsp && fsp_get_pathref_fd(fsp) != -1) {
50 sizeret = SMB_VFS_FGETXATTR(fsp, xattr_name, val, size);
52 sizeret = SMB_VFS_GETXATTR(handle->conn, smb_fname,
53 XATTR_NTACL_NAME, val, size);
60 if (saved_errno != 0) {
67 static NTSTATUS fget_acl_blob(TALLOC_CTX *ctx,
68 vfs_handle_struct *handle,
81 tmp = talloc_realloc(ctx, val, uint8_t, size);
84 return NT_STATUS_NO_MEMORY;
89 getxattr_do(handle, fsp, NULL, XATTR_NTACL_NAME, val, size);
93 pblob->length = sizeret;
97 if (errno != ERANGE) {
101 /* Too small, try again. */
103 getxattr_do(handle, fsp, NULL, XATTR_NTACL_NAME, NULL, 0);
108 if (size < sizeret) {
113 /* Max ACL size is 65536 bytes. */
120 /* Real error - exit here. */
122 return map_nt_error_from_unix(errno);
126 static NTSTATUS get_acl_blob_at(TALLOC_CTX *ctx,
127 vfs_handle_struct *handle,
128 struct files_struct *dirfsp,
129 const struct smb_filename *smb_fname,
141 tmp = talloc_realloc(ctx, val, uint8_t, size);
144 return NT_STATUS_NO_MEMORY;
149 getxattr_do(handle, NULL, smb_fname, XATTR_NTACL_NAME, val, size);
153 pblob->length = sizeret;
157 if (errno != ERANGE) {
161 /* Too small, try again. */
163 getxattr_do(handle, NULL, smb_fname, XATTR_NTACL_NAME, NULL, 0);
168 if (size < sizeret) {
173 /* Max ACL size is 65536 bytes. */
180 /* Real error - exit here. */
182 return map_nt_error_from_unix(errno);
186 /*******************************************************************
187 Store a DATA_BLOB into an xattr given an fsp pointer.
188 *******************************************************************/
190 static NTSTATUS store_acl_blob_fsp(vfs_handle_struct *handle,
197 DEBUG(10,("store_acl_blob_fsp: storing blob length %u on file %s\n",
198 (unsigned int)pblob->length, fsp_str_dbg(fsp)));
201 ret = SMB_VFS_FSETXATTR(fsp, XATTR_NTACL_NAME,
202 pblob->data, pblob->length, 0);
208 DEBUG(5, ("store_acl_blob_fsp: setting attr failed for file %s"
211 strerror(saved_errno) ));
213 return map_nt_error_from_unix(saved_errno);
218 /*********************************************************************
219 Remove a Windows ACL - we're setting the underlying POSIX ACL.
220 *********************************************************************/
222 static int sys_acl_set_fd_xattr(vfs_handle_struct *handle,
227 struct acl_common_fsp_ext *ext = (struct acl_common_fsp_ext *)
228 VFS_FETCH_FSP_EXTENSION(handle, fsp);
231 ret = SMB_VFS_NEXT_SYS_ACL_SET_FD(handle,
239 if (ext != NULL && ext->setting_nt_acl) {
244 SMB_VFS_FREMOVEXATTR(fsp, XATTR_NTACL_NAME);
250 static int connect_acl_xattr(struct vfs_handle_struct *handle,
254 int ret = SMB_VFS_NEXT_CONNECT(handle, service, user);
256 struct acl_common_config *config = NULL;
262 ok = init_acl_common_config(handle, ACL_MODULE_NAME);
264 DBG_ERR("init_acl_common_config failed\n");
268 /* Ensure we have the parameters correct if we're
269 * using this module. */
270 DEBUG(2,("connect_acl_xattr: setting 'inherit acls = true' "
271 "'dos filemode = true' and "
272 "'force unknown acl user = true' for service %s\n",
275 lp_do_parameter(SNUM(handle->conn), "inherit acls", "true");
276 lp_do_parameter(SNUM(handle->conn), "dos filemode", "true");
277 lp_do_parameter(SNUM(handle->conn), "force unknown acl user", "true");
279 SMB_VFS_HANDLE_GET_DATA(handle, config,
280 struct acl_common_config,
283 if (config->ignore_system_acls) {
284 mode_t create_mask = lp_create_mask(SNUM(handle->conn));
285 char *create_mask_str = NULL;
287 if ((create_mask & 0666) != 0666) {
289 create_mask_str = talloc_asprintf(handle, "0%o",
291 if (create_mask_str == NULL) {
292 DBG_ERR("talloc_asprintf failed\n");
296 DBG_NOTICE("setting 'create mask = %s'\n", create_mask_str);
298 lp_do_parameter (SNUM(handle->conn),
299 "create mask", create_mask_str);
301 TALLOC_FREE(create_mask_str);
304 DBG_NOTICE("setting 'directory mask = 0777', "
305 "'store dos attributes = yes' and all "
306 "'map ...' options to 'no'\n");
308 lp_do_parameter(SNUM(handle->conn), "directory mask", "0777");
309 lp_do_parameter(SNUM(handle->conn), "map archive", "no");
310 lp_do_parameter(SNUM(handle->conn), "map hidden", "no");
311 lp_do_parameter(SNUM(handle->conn), "map readonly", "no");
312 lp_do_parameter(SNUM(handle->conn), "map system", "no");
313 lp_do_parameter(SNUM(handle->conn), "store dos attributes",
320 static int acl_xattr_unlinkat(vfs_handle_struct *handle,
321 struct files_struct *dirfsp,
322 const struct smb_filename *smb_fname,
327 if (flags & AT_REMOVEDIR) {
328 ret = rmdir_acl_common(handle,
332 ret = unlink_acl_common(handle,
340 static NTSTATUS acl_xattr_fget_nt_acl(vfs_handle_struct *handle,
342 uint32_t security_info,
344 struct security_descriptor **ppdesc)
347 status = fget_nt_acl_common(fget_acl_blob, handle, fsp,
348 security_info, mem_ctx, ppdesc);
352 static NTSTATUS acl_xattr_fset_nt_acl(vfs_handle_struct *handle,
354 uint32_t security_info_sent,
355 const struct security_descriptor *psd)
358 status = fset_nt_acl_common(fget_acl_blob, store_acl_blob_fsp,
360 handle, fsp, security_info_sent, psd);
364 static struct vfs_fn_pointers vfs_acl_xattr_fns = {
365 .connect_fn = connect_acl_xattr,
366 .unlinkat_fn = acl_xattr_unlinkat,
367 .fchmod_fn = fchmod_acl_module_common,
368 .fget_nt_acl_fn = acl_xattr_fget_nt_acl,
369 .fset_nt_acl_fn = acl_xattr_fset_nt_acl,
370 .sys_acl_set_fd_fn = sys_acl_set_fd_xattr
374 NTSTATUS vfs_acl_xattr_init(TALLOC_CTX *ctx)
376 return smb_register_vfs(SMB_VFS_INTERFACE_VERSION, "acl_xattr",