source: branches/samba-3.5.x/source3/modules/vfs_acl_tdb.c

Last change on this file was 599, checked in by Herwig Bauernfeind, 14 years ago

Samba 3.5: Update trunk to 3.5.9
File size: 10.8 KB
Line 
1/*
2 * Store Windows ACLs in a tdb.
3 *
4 * Copyright (C) Volker Lendecke, 2008
5 * Copyright (C) Jeremy Allison, 2008
6 *
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.
11 *
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.
16 *
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/>.
19 */
20
21/* NOTE: This is an experimental module, not yet finished. JRA. */
22
23#include "includes.h"
24#include "librpc/gen_ndr/xattr.h"
25#include "librpc/gen_ndr/ndr_xattr.h"
26#include "../lib/crypto/crypto.h"
27
28#undef DBGC_CLASS
29#define DBGC_CLASS DBGC_VFS
30
31#define ACL_MODULE_NAME "acl_tdb"
32#include "modules/vfs_acl_common.c"
33
34static unsigned int ref_count;
35static struct db_context *acl_db;
36
37/*******************************************************************
38 Open acl_db if not already open, increment ref count.
39*******************************************************************/
40
41static bool acl_tdb_init(void)
42{
43 char *dbname;
44
45 if (acl_db) {
46 ref_count++;
47 return true;
48 }
49
50 dbname = state_path("file_ntacls.tdb");
51
52 if (dbname == NULL) {
53 errno = ENOSYS;
54 return false;
55 }
56
57 become_root();
58 acl_db = db_open(NULL, dbname, 0, TDB_DEFAULT, O_RDWR|O_CREAT, 0600);
59 unbecome_root();
60
61 if (acl_db == NULL) {
62#if defined(ENOTSUP)
63 errno = ENOTSUP;
64#else
65 errno = ENOSYS;
66#endif
67 TALLOC_FREE(dbname);
68 return false;
69 }
70
71 ref_count++;
72 TALLOC_FREE(dbname);
73 return true;
74}
75
76/*******************************************************************
77 Lower ref count and close acl_db if zero.
78*******************************************************************/
79
80static void disconnect_acl_tdb(struct vfs_handle_struct *handle)
81{
82 SMB_VFS_NEXT_DISCONNECT(handle);
83 ref_count--;
84 if (ref_count == 0) {
85 TALLOC_FREE(acl_db);
86 }
87}
88
89/*******************************************************************
90 Fetch_lock the tdb acl record for a file
91*******************************************************************/
92
93static struct db_record *acl_tdb_lock(TALLOC_CTX *mem_ctx,
94 struct db_context *db,
95 const struct file_id *id)
96{
97 uint8 id_buf[16];
98
99 /* For backwards compatibility only store the dev/inode. */
100 push_file_id_16((char *)id_buf, id);
101 return db->fetch_locked(db,
102 mem_ctx,
103 make_tdb_data(id_buf,
104 sizeof(id_buf)));
105}
106
107/*******************************************************************
108 Delete the tdb acl record for a file
109*******************************************************************/
110
111static NTSTATUS acl_tdb_delete(vfs_handle_struct *handle,
112 struct db_context *db,
113 SMB_STRUCT_STAT *psbuf)
114{
115 NTSTATUS status;
116 struct file_id id = vfs_file_id_from_sbuf(handle->conn, psbuf);
117 struct db_record *rec = acl_tdb_lock(talloc_tos(), db, &id);
118
119 /*
120 * If rec == NULL there's not much we can do about it
121 */
122
123 if (rec == NULL) {
124 DEBUG(10,("acl_tdb_delete: rec == NULL\n"));
125 TALLOC_FREE(rec);
126 return NT_STATUS_OK;
127 }
128
129 status = rec->delete_rec(rec);
130 TALLOC_FREE(rec);
131 return status;
132}
133
134/*******************************************************************
135 Pull a security descriptor into a DATA_BLOB from a tdb store.
136*******************************************************************/
137
138static NTSTATUS get_acl_blob(TALLOC_CTX *ctx,
139 vfs_handle_struct *handle,
140 files_struct *fsp,
141 const char *name,
142 DATA_BLOB *pblob)
143{
144 uint8 id_buf[16];
145 TDB_DATA data;
146 struct file_id id;
147 struct db_context *db = acl_db;
148 NTSTATUS status = NT_STATUS_OK;
149 SMB_STRUCT_STAT sbuf;
150
151 ZERO_STRUCT(sbuf);
152
153 if (fsp) {
154 status = vfs_stat_fsp(fsp);
155 sbuf = fsp->fsp_name->st;
156 } else {
157 int ret = vfs_stat_smb_fname(handle->conn, name, &sbuf);
158 if (ret == -1) {
159 status = map_nt_error_from_unix(errno);
160 }
161 }
162
163 if (!NT_STATUS_IS_OK(status)) {
164 return status;
165 }
166
167 id = vfs_file_id_from_sbuf(handle->conn, &sbuf);
168
169 /* For backwards compatibility only store the dev/inode. */
170 push_file_id_16((char *)id_buf, &id);
171
172 if (db->fetch(db,
173 ctx,
174 make_tdb_data(id_buf, sizeof(id_buf)),
175 &data) == -1) {
176 return NT_STATUS_INTERNAL_DB_CORRUPTION;
177 }
178
179 pblob->data = data.dptr;
180 pblob->length = data.dsize;
181
182 DEBUG(10,("get_acl_blob: returned %u bytes from file %s\n",
183 (unsigned int)data.dsize, name ));
184
185 if (pblob->length == 0 || pblob->data == NULL) {
186 return NT_STATUS_NOT_FOUND;
187 }
188 return NT_STATUS_OK;
189}
190
191/*******************************************************************
192 Store a DATA_BLOB into a tdb record given an fsp pointer.
193*******************************************************************/
194
195static NTSTATUS store_acl_blob_fsp(vfs_handle_struct *handle,
196 files_struct *fsp,
197 DATA_BLOB *pblob)
198{
199 uint8 id_buf[16];
200 struct file_id id;
201 TDB_DATA data;
202 struct db_context *db = acl_db;
203 struct db_record *rec;
204 NTSTATUS status;
205
206 DEBUG(10,("store_acl_blob_fsp: storing blob length %u on file %s\n",
207 (unsigned int)pblob->length, fsp_str_dbg(fsp)));
208
209 status = vfs_stat_fsp(fsp);
210 if (!NT_STATUS_IS_OK(status)) {
211 return status;
212 }
213
214 id = vfs_file_id_from_sbuf(handle->conn, &fsp->fsp_name->st);
215
216 /* For backwards compatibility only store the dev/inode. */
217 push_file_id_16((char *)id_buf, &id);
218 rec = db->fetch_locked(db, talloc_tos(),
219 make_tdb_data(id_buf,
220 sizeof(id_buf)));
221 if (rec == NULL) {
222 DEBUG(0, ("store_acl_blob_fsp_tdb: fetch_lock failed\n"));
223 return NT_STATUS_INTERNAL_DB_CORRUPTION;
224 }
225 data.dptr = pblob->data;
226 data.dsize = pblob->length;
227 return rec->store(rec, data, 0);
228}
229
230/*********************************************************************
231 On unlink we need to delete the tdb record (if using tdb).
232*********************************************************************/
233
234static int unlink_acl_tdb(vfs_handle_struct *handle,
235 const struct smb_filename *smb_fname)
236{
237 struct smb_filename *smb_fname_tmp = NULL;
238 struct db_context *db = acl_db;
239 NTSTATUS status;
240 int ret = -1;
241
242 status = copy_smb_filename(talloc_tos(), smb_fname, &smb_fname_tmp);
243 if (!NT_STATUS_IS_OK(status)) {
244 errno = map_errno_from_nt_status(status);
245 goto out;
246 }
247
248 if (lp_posix_pathnames()) {
249 ret = SMB_VFS_LSTAT(handle->conn, smb_fname_tmp);
250 } else {
251 ret = SMB_VFS_STAT(handle->conn, smb_fname_tmp);
252 }
253
254 if (ret == -1) {
255 goto out;
256 }
257
258 ret = unlink_acl_common(handle, smb_fname_tmp);
259
260 if (ret == -1) {
261 goto out;
262 }
263
264 acl_tdb_delete(handle, db, &smb_fname_tmp->st);
265 out:
266 return ret;
267}
268
269/*********************************************************************
270 On rmdir we need to delete the tdb record (if using tdb).
271*********************************************************************/
272
273static int rmdir_acl_tdb(vfs_handle_struct *handle, const char *path)
274{
275
276 SMB_STRUCT_STAT sbuf;
277 struct db_context *db = acl_db;
278 int ret = -1;
279
280 if (lp_posix_pathnames()) {
281 ret = vfs_lstat_smb_fname(handle->conn, path, &sbuf);
282 } else {
283 ret = vfs_stat_smb_fname(handle->conn, path, &sbuf);
284 }
285
286 if (ret == -1) {
287 return -1;
288 }
289
290 ret = rmdir_acl_common(handle, path);
291 if (ret == -1) {
292 return -1;
293 }
294
295 acl_tdb_delete(handle, db, &sbuf);
296 return 0;
297}
298
299/*******************************************************************
300 Handle opening the storage tdb if so configured.
301*******************************************************************/
302
303static int connect_acl_tdb(struct vfs_handle_struct *handle,
304 const char *service,
305 const char *user)
306{
307 int ret = SMB_VFS_NEXT_CONNECT(handle, service, user);
308
309 if (ret < 0) {
310 return ret;
311 }
312
313 if (!acl_tdb_init()) {
314 SMB_VFS_NEXT_DISCONNECT(handle);
315 return -1;
316 }
317
318 /* Ensure we have the parameters correct if we're
319 * using this module. */
320 DEBUG(2,("connect_acl_tdb: setting 'inherit acls = true' "
321 "'dos filemode = true' and "
322 "'force unknown acl user = true' for service %s\n",
323 service ));
324
325 lp_do_parameter(SNUM(handle->conn), "inherit acls", "true");
326 lp_do_parameter(SNUM(handle->conn), "dos filemode", "true");
327 lp_do_parameter(SNUM(handle->conn), "force unknown acl user", "true");
328
329 return 0;
330}
331
332/*********************************************************************
333 Remove a Windows ACL - we're setting the underlying POSIX ACL.
334*********************************************************************/
335
336static int sys_acl_set_file_tdb(vfs_handle_struct *handle,
337 const char *path,
338 SMB_ACL_TYPE_T type,
339 SMB_ACL_T theacl)
340{
341 SMB_STRUCT_STAT sbuf;
342 struct db_context *db = acl_db;
343 int ret = -1;
344
345 if (lp_posix_pathnames()) {
346 ret = vfs_lstat_smb_fname(handle->conn, path, &sbuf);
347 } else {
348 ret = vfs_stat_smb_fname(handle->conn, path, &sbuf);
349 }
350
351 if (ret == -1) {
352 return -1;
353 }
354
355 ret = SMB_VFS_NEXT_SYS_ACL_SET_FILE(handle,
356 path,
357 type,
358 theacl);
359 if (ret == -1) {
360 return -1;
361 }
362
363 acl_tdb_delete(handle, db, &sbuf);
364 return 0;
365}
366
367/*********************************************************************
368 Remove a Windows ACL - we're setting the underlying POSIX ACL.
369*********************************************************************/
370
371static int sys_acl_set_fd_tdb(vfs_handle_struct *handle,
372 files_struct *fsp,
373 SMB_ACL_T theacl)
374{
375 struct db_context *db = acl_db;
376 NTSTATUS status;
377 int ret;
378
379 status = vfs_stat_fsp(fsp);
380 if (!NT_STATUS_IS_OK(status)) {
381 return -1;
382 }
383
384 ret = SMB_VFS_NEXT_SYS_ACL_SET_FD(handle,
385 fsp,
386 theacl);
387 if (ret == -1) {
388 return -1;
389 }
390
391 acl_tdb_delete(handle, db, &fsp->fsp_name->st);
392 return 0;
393}
394
395static struct vfs_fn_pointers vfs_acl_tdb_fns = {
396 .connect_fn = connect_acl_tdb,
397 .disconnect = disconnect_acl_tdb,
398 .opendir = opendir_acl_common,
399 .mkdir = mkdir_acl_common,
400 .rmdir = rmdir_acl_tdb,
401 .open = open_acl_common,
402 .create_file = create_file_acl_common,
403 .unlink = unlink_acl_tdb,
404 .chmod = chmod_acl_module_common,
405 .fchmod = fchmod_acl_module_common,
406 .fget_nt_acl = fget_nt_acl_common,
407 .get_nt_acl = get_nt_acl_common,
408 .fset_nt_acl = fset_nt_acl_common,
409 .chmod_acl = chmod_acl_acl_module_common,
410 .fchmod_acl = fchmod_acl_acl_module_common,
411 .sys_acl_set_file = sys_acl_set_file_tdb,
412 .sys_acl_set_fd = sys_acl_set_fd_tdb
413};
414
415NTSTATUS vfs_acl_tdb_init(void)
416{
417 return smb_register_vfs(SMB_VFS_INTERFACE_VERSION, "acl_tdb",
418 &vfs_acl_tdb_fns);
419}
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