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->fh->fd != -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 get_acl_blob(TALLOC_CTX *ctx,
68 vfs_handle_struct *handle,
70 const struct smb_filename *smb_fname,
82 tmp = talloc_realloc(ctx, val, uint8_t, size);
85 return NT_STATUS_NO_MEMORY;
90 getxattr_do(handle, fsp, smb_fname, XATTR_NTACL_NAME, val, size);
94 pblob->length = sizeret;
98 if (errno != ERANGE) {
102 /* Too small, try again. */
104 getxattr_do(handle, fsp, smb_fname, XATTR_NTACL_NAME, NULL, 0);
109 if (size < sizeret) {
114 /* Max ACL size is 65536 bytes. */
121 /* Real error - exit here. */
123 return map_nt_error_from_unix(errno);
126 /*******************************************************************
127 Store a DATA_BLOB into an xattr given an fsp pointer.
128 *******************************************************************/
130 static NTSTATUS store_acl_blob_fsp(vfs_handle_struct *handle,
137 DEBUG(10,("store_acl_blob_fsp: storing blob length %u on file %s\n",
138 (unsigned int)pblob->length, fsp_str_dbg(fsp)));
141 if (fsp->fh->fd != -1) {
142 ret = SMB_VFS_FSETXATTR(fsp, XATTR_NTACL_NAME,
143 pblob->data, pblob->length, 0);
145 ret = SMB_VFS_SETXATTR(fsp->conn, fsp->fsp_name,
147 pblob->data, pblob->length, 0);
154 DEBUG(5, ("store_acl_blob_fsp: setting attr failed for file %s"
157 strerror(saved_errno) ));
159 return map_nt_error_from_unix(saved_errno);
164 /*********************************************************************
165 Remove a Windows ACL - we're setting the underlying POSIX ACL.
166 *********************************************************************/
168 static int sys_acl_set_file_xattr(vfs_handle_struct *handle,
169 const struct smb_filename *smb_fname,
173 int ret = SMB_VFS_NEXT_SYS_ACL_SET_FILE(handle,
182 SMB_VFS_REMOVEXATTR(handle->conn, smb_fname,
189 /*********************************************************************
190 Remove a Windows ACL - we're setting the underlying POSIX ACL.
191 *********************************************************************/
193 static int sys_acl_set_fd_xattr(vfs_handle_struct *handle,
197 int ret = SMB_VFS_NEXT_SYS_ACL_SET_FD(handle,
205 SMB_VFS_FREMOVEXATTR(fsp, XATTR_NTACL_NAME);
211 static int connect_acl_xattr(struct vfs_handle_struct *handle,
215 int ret = SMB_VFS_NEXT_CONNECT(handle, service, user);
217 struct acl_common_config *config = NULL;
223 ok = init_acl_common_config(handle, ACL_MODULE_NAME);
225 DBG_ERR("init_acl_common_config failed\n");
229 /* Ensure we have the parameters correct if we're
230 * using this module. */
231 DEBUG(2,("connect_acl_xattr: setting 'inherit acls = true' "
232 "'dos filemode = true' and "
233 "'force unknown acl user = true' for service %s\n",
236 lp_do_parameter(SNUM(handle->conn), "inherit acls", "true");
237 lp_do_parameter(SNUM(handle->conn), "dos filemode", "true");
238 lp_do_parameter(SNUM(handle->conn), "force unknown acl user", "true");
240 SMB_VFS_HANDLE_GET_DATA(handle, config,
241 struct acl_common_config,
244 if (config->ignore_system_acls) {
245 mode_t create_mask = lp_create_mask(SNUM(handle->conn));
246 char *create_mask_str = NULL;
248 if ((create_mask & 0666) != 0666) {
250 create_mask_str = talloc_asprintf(handle, "0%o",
252 if (create_mask_str == NULL) {
253 DBG_ERR("talloc_asprintf failed\n");
257 DBG_NOTICE("setting 'create mask = %s'\n", create_mask_str);
259 lp_do_parameter (SNUM(handle->conn),
260 "create mask", create_mask_str);
262 TALLOC_FREE(create_mask_str);
265 DBG_NOTICE("setting 'directory mask = 0777', "
266 "'store dos attributes = yes' and all "
267 "'map ...' options to 'no'\n");
269 lp_do_parameter(SNUM(handle->conn), "directory mask", "0777");
270 lp_do_parameter(SNUM(handle->conn), "map archive", "no");
271 lp_do_parameter(SNUM(handle->conn), "map hidden", "no");
272 lp_do_parameter(SNUM(handle->conn), "map readonly", "no");
273 lp_do_parameter(SNUM(handle->conn), "map system", "no");
274 lp_do_parameter(SNUM(handle->conn), "store dos attributes",
281 static int acl_xattr_unlinkat(vfs_handle_struct *handle,
282 struct files_struct *dirfsp,
283 const struct smb_filename *smb_fname,
288 if (flags & AT_REMOVEDIR) {
289 ret = rmdir_acl_common(handle,
293 ret = unlink_acl_common(handle,
301 static NTSTATUS acl_xattr_fget_nt_acl(vfs_handle_struct *handle,
303 uint32_t security_info,
305 struct security_descriptor **ppdesc)
308 status = get_nt_acl_common(get_acl_blob, handle, fsp, NULL,
309 security_info, mem_ctx, ppdesc);
313 static NTSTATUS acl_xattr_get_nt_acl(vfs_handle_struct *handle,
314 const struct smb_filename *smb_fname,
315 uint32_t security_info,
317 struct security_descriptor **ppdesc)
320 status = get_nt_acl_common(get_acl_blob, handle, NULL, smb_fname,
321 security_info, mem_ctx, ppdesc);
325 static NTSTATUS acl_xattr_fset_nt_acl(vfs_handle_struct *handle,
327 uint32_t security_info_sent,
328 const struct security_descriptor *psd)
331 status = fset_nt_acl_common(get_acl_blob, store_acl_blob_fsp,
333 handle, fsp, security_info_sent, psd);
337 static struct vfs_fn_pointers vfs_acl_xattr_fns = {
338 .connect_fn = connect_acl_xattr,
339 .unlinkat_fn = acl_xattr_unlinkat,
340 .chmod_fn = chmod_acl_module_common,
341 .fchmod_fn = fchmod_acl_module_common,
342 .fget_nt_acl_fn = acl_xattr_fget_nt_acl,
343 .get_nt_acl_fn = acl_xattr_get_nt_acl,
344 .fset_nt_acl_fn = acl_xattr_fset_nt_acl,
345 .sys_acl_set_file_fn = sys_acl_set_file_xattr,
346 .sys_acl_set_fd_fn = sys_acl_set_fd_xattr
350 NTSTATUS vfs_acl_xattr_init(TALLOC_CTX *ctx)
352 return smb_register_vfs(SMB_VFS_INTERFACE_VERSION, "acl_xattr",