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 "librpc/gen_ndr/xattr.h"
24 #include "librpc/gen_ndr/ndr_xattr.h"
25 #include "../lib/crypto/crypto.h"
29 #define DBGC_CLASS DBGC_VFS
31 /* Pull in the common functions. */
32 #define ACL_MODULE_NAME "acl_xattr"
34 #include "modules/vfs_acl_common.c"
36 /*******************************************************************
37 Pull a security descriptor into a DATA_BLOB from a xattr.
38 *******************************************************************/
40 static NTSTATUS get_acl_blob(TALLOC_CTX *ctx,
41 vfs_handle_struct *handle,
56 tmp = talloc_realloc(ctx, val, uint8_t, size);
59 return NT_STATUS_NO_MEMORY;
64 if (fsp && fsp->fh->fd != -1) {
65 sizeret = SMB_VFS_FGETXATTR(fsp, XATTR_NTACL_NAME, val, size);
67 sizeret = SMB_VFS_GETXATTR(handle->conn, name,
68 XATTR_NTACL_NAME, val, size);
75 /* Max ACL size is 65536 bytes. */
78 if ((errno == ERANGE) && (size != 65536)) {
79 /* Too small, try again. */
84 /* Real error - exit here. */
86 return map_nt_error_from_unix(errno);
90 pblob->length = sizeret;
94 /*******************************************************************
95 Store a DATA_BLOB into an xattr given an fsp pointer.
96 *******************************************************************/
98 static NTSTATUS store_acl_blob_fsp(vfs_handle_struct *handle,
105 DEBUG(10,("store_acl_blob_fsp: storing blob length %u on file %s\n",
106 (unsigned int)pblob->length, fsp_str_dbg(fsp)));
109 if (fsp->fh->fd != -1) {
110 ret = SMB_VFS_FSETXATTR(fsp, XATTR_NTACL_NAME,
111 pblob->data, pblob->length, 0);
113 ret = SMB_VFS_SETXATTR(fsp->conn, fsp->fsp_name->base_name,
115 pblob->data, pblob->length, 0);
123 DEBUG(5, ("store_acl_blob_fsp: setting attr failed for file %s"
127 return map_nt_error_from_unix(errno);
132 /*********************************************************************
133 Remove a Windows ACL - we're setting the underlying POSIX ACL.
134 *********************************************************************/
136 static int sys_acl_set_file_xattr(vfs_handle_struct *handle,
141 int ret = SMB_VFS_NEXT_SYS_ACL_SET_FILE(handle,
150 SMB_VFS_REMOVEXATTR(handle->conn, name, XATTR_NTACL_NAME);
156 /*********************************************************************
157 Remove a Windows ACL - we're setting the underlying POSIX ACL.
158 *********************************************************************/
160 static int sys_acl_set_fd_xattr(vfs_handle_struct *handle,
164 int ret = SMB_VFS_NEXT_SYS_ACL_SET_FD(handle,
172 SMB_VFS_FREMOVEXATTR(fsp, XATTR_NTACL_NAME);
178 static int connect_acl_xattr(struct vfs_handle_struct *handle,
182 int ret = SMB_VFS_NEXT_CONNECT(handle, service, user);
188 /* Ensure we have the parameters correct if we're
189 * using this module. */
190 DEBUG(2,("connect_acl_xattr: setting 'inherit acls = true' "
191 "'dos filemode = true' and "
192 "'force unknown acl user = true' for service %s\n",
195 lp_do_parameter(SNUM(handle->conn), "inherit acls", "true");
196 lp_do_parameter(SNUM(handle->conn), "dos filemode", "true");
197 lp_do_parameter(SNUM(handle->conn), "force unknown acl user", "true");
202 static struct vfs_fn_pointers vfs_acl_xattr_fns = {
203 .connect_fn = connect_acl_xattr,
204 .rmdir = rmdir_acl_common,
205 .create_file = create_file_acl_common,
206 .unlink = unlink_acl_common,
207 .chmod = chmod_acl_module_common,
208 .fchmod = fchmod_acl_module_common,
209 .fget_nt_acl = fget_nt_acl_common,
210 .get_nt_acl = get_nt_acl_common,
211 .fset_nt_acl = fset_nt_acl_common,
212 .chmod_acl = chmod_acl_acl_module_common,
213 .fchmod_acl = fchmod_acl_acl_module_common,
214 .sys_acl_set_file = sys_acl_set_file_xattr,
215 .sys_acl_set_fd = sys_acl_set_fd_xattr
218 NTSTATUS vfs_acl_xattr_init(void)
220 return smb_register_vfs(SMB_VFS_INTERFACE_VERSION, "acl_xattr",