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 static NTSTATUS parse_acl_blob(const DATA_BLOB *pblob,
31 const struct timespec cts,
33 struct security_descriptor **ppdesc)
35 TALLOC_CTX *ctx = talloc_tos();
36 struct xattr_NTACL xacl;
37 enum ndr_err_code ndr_err;
41 ndr_err = ndr_pull_struct_blob(pblob, ctx, NULL, &xacl,
42 (ndr_pull_flags_fn_t)ndr_pull_xattr_NTACL);
44 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
45 DEBUG(5, ("parse_acl_blob: ndr_pull_xattr_NTACL failed: %s\n",
46 ndr_errstr(ndr_err)));
47 return ndr_map_error2ntstatus(ndr_err);;
50 if (xacl.version != 2) {
51 return NT_STATUS_REVISION_MISMATCH;
55 * Check that the ctime timestamp is ealier
56 * than the stored timestamp.
59 ts = nt_time_to_unix_timespec(&xacl.info.sd_ts->last_changed);
61 if (timespec_compare(&cts, &ts) > 0) {
62 DEBUG(5, ("parse_acl_blob: stored ACL out of date.\n"));
63 return NT_STATUS_EA_CORRUPT_ERROR;
66 *ppdesc = make_sec_desc(ctx, SEC_DESC_REVISION, SEC_DESC_SELF_RELATIVE,
67 (security_info & OWNER_SECURITY_INFORMATION)
68 ? xacl.info.sd_ts->sd->owner_sid : NULL,
69 (security_info & GROUP_SECURITY_INFORMATION)
70 ? xacl.info.sd_ts->sd->group_sid : NULL,
71 (security_info & SACL_SECURITY_INFORMATION)
72 ? xacl.info.sd_ts->sd->sacl : NULL,
73 (security_info & DACL_SECURITY_INFORMATION)
74 ? xacl.info.sd_ts->sd->dacl : NULL,
77 TALLOC_FREE(xacl.info.sd);
79 return (*ppdesc != NULL) ? NT_STATUS_OK : NT_STATUS_NO_MEMORY;
82 static NTSTATUS get_acl_blob(TALLOC_CTX *ctx,
83 vfs_handle_struct *handle,
98 tmp = TALLOC_REALLOC_ARRAY(ctx, val, uint8_t, size);
101 return NT_STATUS_NO_MEMORY;
106 if (fsp && fsp->fh->fd != -1) {
107 sizeret = SMB_VFS_FGETXATTR(fsp, XATTR_NTACL_NAME, val, size);
109 sizeret = SMB_VFS_GETXATTR(handle->conn, name,
110 XATTR_NTACL_NAME, val, size);
117 /* Max ACL size is 65536 bytes. */
120 if ((errno == ERANGE) && (size != 65536)) {
121 /* Too small, try again. */
126 /* Real error - exit here. */
128 return map_nt_error_from_unix(errno);
132 pblob->length = sizeret;
136 static NTSTATUS get_nt_acl_xattr_internal(vfs_handle_struct *handle,
139 uint32 security_info,
142 TALLOC_CTX *ctx = talloc_tos();
144 SMB_STRUCT_STAT sbuf;
147 if (fsp && name == NULL) {
148 name = fsp->fsp_name;
151 DEBUG(10, ("get_nt_acl_xattr_internal: name=%s\n", name));
153 status = get_acl_blob(ctx, handle, fsp, name, &blob);
154 if (!NT_STATUS_IS_OK(status)) {
155 DEBUG(10, ("get_acl_blob returned %s\n", nt_errstr(status)));
159 if (fsp && fsp->fh->fd != -1) {
160 if (SMB_VFS_FSTAT(fsp, &sbuf) == -1) {
161 return map_nt_error_from_unix(errno);
164 if (SMB_VFS_STAT(handle->conn, name, &sbuf) == -1) {
165 return map_nt_error_from_unix(errno);
169 status = parse_acl_blob(&blob, get_ctimespec(&sbuf),
170 security_info, ppdesc);
171 if (!NT_STATUS_IS_OK(status)) {
172 DEBUG(10, ("parse_acl_blob returned %s\n",
177 TALLOC_FREE(blob.data);
181 static int mkdir_acl_xattr(vfs_handle_struct *handle, const char *path, mode_t mode)
183 return SMB_VFS_NEXT_MKDIR(handle, path, mode);
186 /*********************************************************************
187 * Currently this only works for existing files. Need to work on
188 * inheritance for new files.
189 *********************************************************************/
191 static int open_acl_xattr(vfs_handle_struct *handle, const char *fname, files_struct *fsp, int flags, mode_t mode)
193 uint32_t access_granted = 0;
194 SEC_DESC *pdesc = NULL;
195 NTSTATUS status = get_nt_acl_xattr_internal(handle,
198 (OWNER_SECURITY_INFORMATION |
199 GROUP_SECURITY_INFORMATION |
200 DACL_SECURITY_INFORMATION),
202 if (NT_STATUS_IS_OK(status)) {
203 /* See if we can access it. */
204 if (!se_access_check(pdesc,
205 handle->conn->server_info->ptok,
209 errno = map_errno_from_nt_status(status);
214 return SMB_VFS_NEXT_OPEN(handle, fname, fsp, flags, mode);
217 static NTSTATUS fget_nt_acl_xattr(vfs_handle_struct *handle, files_struct *fsp,
218 uint32 security_info, SEC_DESC **ppdesc)
220 NTSTATUS status = get_nt_acl_xattr_internal(handle, fsp,
221 NULL, security_info, ppdesc);
222 if (NT_STATUS_IS_OK(status)) {
225 return SMB_VFS_NEXT_FGET_NT_ACL(handle, fsp,
226 security_info, ppdesc);
229 static NTSTATUS get_nt_acl_xattr(vfs_handle_struct *handle,
230 const char *name, uint32 security_info, SEC_DESC **ppdesc)
232 NTSTATUS status = get_nt_acl_xattr_internal(handle, NULL,
233 name, security_info, ppdesc);
234 if (NT_STATUS_IS_OK(status)) {
237 return SMB_VFS_NEXT_GET_NT_ACL(handle, name,
238 security_info, ppdesc);
241 static NTSTATUS create_acl_blob(SEC_DESC *psd, DATA_BLOB *pblob)
243 struct xattr_NTACL xacl;
244 struct security_descriptor_timestamp sd_ts;
245 enum ndr_err_code ndr_err;
246 TALLOC_CTX *ctx = talloc_tos();
247 struct timespec curr = timespec_current();
252 /* Horrid hack as setting an xattr changes the ctime
253 * on Linux. This gives a race of 1 second during
254 * which we would not see a POSIX ACL set.
259 xacl.info.sd_ts = &sd_ts;
260 xacl.info.sd_ts->sd = psd;
261 unix_timespec_to_nt_time(&xacl.info.sd_ts->last_changed, curr);
263 ndr_err = ndr_push_struct_blob(
264 pblob, ctx, NULL, &xacl,
265 (ndr_push_flags_fn_t)ndr_push_xattr_NTACL);
267 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
268 DEBUG(5, ("create_acl_blob: ndr_push_xattr_NTACL failed: %s\n",
269 ndr_errstr(ndr_err)));
270 return ndr_map_error2ntstatus(ndr_err);;
276 static NTSTATUS store_acl_blob(files_struct *fsp,
282 DEBUG(10,("store_acl_blob: storing blob length %u on file %s\n",
283 (unsigned int)pblob->length, fsp->fsp_name));
286 if (fsp->fh->fd != -1) {
287 ret = SMB_VFS_FSETXATTR(fsp, XATTR_NTACL_NAME,
288 pblob->data, pblob->length, 0);
290 ret = SMB_VFS_SETXATTR(fsp->conn, fsp->fsp_name,
292 pblob->data, pblob->length, 0);
300 DEBUG(5, ("store_acl_blob: setting attr failed for file %s"
304 return map_nt_error_from_unix(errno);
309 static NTSTATUS fset_nt_acl_xattr(vfs_handle_struct *handle, files_struct *fsp,
310 uint32 security_info_sent, SEC_DESC *psd)
315 status = SMB_VFS_NEXT_FSET_NT_ACL(handle, fsp, security_info_sent, psd);
316 if (!NT_STATUS_IS_OK(status)) {
320 create_acl_blob(psd, &blob);
321 store_acl_blob(fsp, &blob);
326 /* VFS operations structure */
328 static vfs_op_tuple skel_op_tuples[] =
330 {SMB_VFS_OP(mkdir_acl_xattr), SMB_VFS_OP_MKDIR, SMB_VFS_LAYER_TRANSPARENT},
331 {SMB_VFS_OP(open_acl_xattr), SMB_VFS_OP_OPEN, SMB_VFS_LAYER_TRANSPARENT},
333 /* NT File ACL operations */
335 {SMB_VFS_OP(fget_nt_acl_xattr),SMB_VFS_OP_FGET_NT_ACL,SMB_VFS_LAYER_TRANSPARENT},
336 {SMB_VFS_OP(get_nt_acl_xattr), SMB_VFS_OP_GET_NT_ACL, SMB_VFS_LAYER_TRANSPARENT},
337 {SMB_VFS_OP(fset_nt_acl_xattr),SMB_VFS_OP_FSET_NT_ACL,SMB_VFS_LAYER_TRANSPARENT},
339 {SMB_VFS_OP(NULL), SMB_VFS_OP_NOOP, SMB_VFS_LAYER_NOOP}
342 NTSTATUS vfs_acl_xattr_init(void)
344 return smb_register_vfs(SMB_VFS_INTERFACE_VERSION, "acl_xattr", skel_op_tuples);