Add acl_xattr:ignore system acls boolean (normally false) to allow
[samba.git] / source3 / modules / vfs_acl_tdb.c
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 #include "dbwrap.h"
28
29 #undef DBGC_CLASS
30 #define DBGC_CLASS DBGC_VFS
31
32 #define ACL_MODULE_NAME "acl_tdb"
33 #include "modules/vfs_acl_common.c"
34
35 static unsigned int ref_count;
36 static struct db_context *acl_db;
37
38 /*******************************************************************
39  Open acl_db if not already open, increment ref count.
40 *******************************************************************/
41
42 static bool acl_tdb_init(void)
43 {
44         char *dbname;
45
46         if (acl_db) {
47                 ref_count++;
48                 return true;
49         }
50
51         dbname = state_path("file_ntacls.tdb");
52
53         if (dbname == NULL) {
54                 errno = ENOSYS;
55                 return false;
56         }
57
58         become_root();
59         acl_db = db_open(NULL, dbname, 0, TDB_DEFAULT, O_RDWR|O_CREAT, 0600);
60         unbecome_root();
61
62         if (acl_db == NULL) {
63 #if defined(ENOTSUP)
64                 errno = ENOTSUP;
65 #else
66                 errno = ENOSYS;
67 #endif
68                 TALLOC_FREE(dbname);
69                 return false;
70         }
71
72         ref_count++;
73         TALLOC_FREE(dbname);
74         return true;
75 }
76
77 /*******************************************************************
78  Lower ref count and close acl_db if zero.
79 *******************************************************************/
80
81 static void disconnect_acl_tdb(struct vfs_handle_struct *handle)
82 {
83         SMB_VFS_NEXT_DISCONNECT(handle);
84         ref_count--;
85         if (ref_count == 0) {
86                 TALLOC_FREE(acl_db);
87         }
88 }
89
90 /*******************************************************************
91  Fetch_lock the tdb acl record for a file
92 *******************************************************************/
93
94 static struct db_record *acl_tdb_lock(TALLOC_CTX *mem_ctx,
95                                         struct db_context *db,
96                                         const struct file_id *id)
97 {
98         uint8 id_buf[16];
99
100         /* For backwards compatibility only store the dev/inode. */
101         push_file_id_16((char *)id_buf, id);
102         return db->fetch_locked(db,
103                                 mem_ctx,
104                                 make_tdb_data(id_buf,
105                                         sizeof(id_buf)));
106 }
107
108 /*******************************************************************
109  Delete the tdb acl record for a file
110 *******************************************************************/
111
112 static NTSTATUS acl_tdb_delete(vfs_handle_struct *handle,
113                                 struct db_context *db,
114                                 SMB_STRUCT_STAT *psbuf)
115 {
116         NTSTATUS status;
117         struct file_id id = vfs_file_id_from_sbuf(handle->conn, psbuf);
118         struct db_record *rec = acl_tdb_lock(talloc_tos(), db, &id);
119
120         /*
121          * If rec == NULL there's not much we can do about it
122          */
123
124         if (rec == NULL) {
125                 DEBUG(10,("acl_tdb_delete: rec == NULL\n"));
126                 TALLOC_FREE(rec);
127                 return NT_STATUS_OK;
128         }
129
130         status = rec->delete_rec(rec);
131         TALLOC_FREE(rec);
132         return status;
133 }
134
135 /*******************************************************************
136  Pull a security descriptor into a DATA_BLOB from a tdb store.
137 *******************************************************************/
138
139 static NTSTATUS get_acl_blob(TALLOC_CTX *ctx,
140                         vfs_handle_struct *handle,
141                         files_struct *fsp,
142                         const char *name,
143                         DATA_BLOB *pblob)
144 {
145         uint8 id_buf[16];
146         TDB_DATA data;
147         struct file_id id;
148         struct db_context *db = acl_db;
149         NTSTATUS status = NT_STATUS_OK;
150         SMB_STRUCT_STAT sbuf;
151
152         ZERO_STRUCT(sbuf);
153
154         if (fsp) {
155                 status = vfs_stat_fsp(fsp);
156                 sbuf = fsp->fsp_name->st;
157         } else {
158                 int ret = vfs_stat_smb_fname(handle->conn, name, &sbuf);
159                 if (ret == -1) {
160                         status = map_nt_error_from_unix(errno);
161                 }
162         }
163
164         if (!NT_STATUS_IS_OK(status)) {
165                 return status;
166         }
167
168         id = vfs_file_id_from_sbuf(handle->conn, &sbuf);
169
170         /* For backwards compatibility only store the dev/inode. */
171         push_file_id_16((char *)id_buf, &id);
172
173         if (db->fetch(db,
174                         ctx,
175                         make_tdb_data(id_buf, sizeof(id_buf)),
176                         &data) == -1) {
177                 return NT_STATUS_INTERNAL_DB_CORRUPTION;
178         }
179
180         pblob->data = data.dptr;
181         pblob->length = data.dsize;
182
183         DEBUG(10,("get_acl_blob: returned %u bytes from file %s\n",
184                 (unsigned int)data.dsize, name ));
185
186         if (pblob->length == 0 || pblob->data == NULL) {
187                 return NT_STATUS_NOT_FOUND;
188         }
189         return NT_STATUS_OK;
190 }
191
192 /*******************************************************************
193  Store a DATA_BLOB into a tdb record given an fsp pointer.
194 *******************************************************************/
195
196 static NTSTATUS store_acl_blob_fsp(vfs_handle_struct *handle,
197                                 files_struct *fsp,
198                                 DATA_BLOB *pblob)
199 {
200         uint8 id_buf[16];
201         struct file_id id;
202         TDB_DATA data;
203         struct db_context *db = acl_db;
204         struct db_record *rec;
205         NTSTATUS status;
206
207         DEBUG(10,("store_acl_blob_fsp: storing blob length %u on file %s\n",
208                   (unsigned int)pblob->length, fsp_str_dbg(fsp)));
209
210         status = vfs_stat_fsp(fsp);
211         if (!NT_STATUS_IS_OK(status)) {
212                 return status;
213         }
214
215         id = vfs_file_id_from_sbuf(handle->conn, &fsp->fsp_name->st);
216
217         /* For backwards compatibility only store the dev/inode. */
218         push_file_id_16((char *)id_buf, &id);
219         rec = db->fetch_locked(db, talloc_tos(),
220                                 make_tdb_data(id_buf,
221                                         sizeof(id_buf)));
222         if (rec == NULL) {
223                 DEBUG(0, ("store_acl_blob_fsp_tdb: fetch_lock failed\n"));
224                 return NT_STATUS_INTERNAL_DB_CORRUPTION;
225         }
226         data.dptr = pblob->data;
227         data.dsize = pblob->length;
228         return rec->store(rec, data, 0);
229 }
230
231 /*********************************************************************
232  On unlink we need to delete the tdb record (if using tdb).
233 *********************************************************************/
234
235 static int unlink_acl_tdb(vfs_handle_struct *handle,
236                           const struct smb_filename *smb_fname)
237 {
238         struct smb_filename *smb_fname_tmp = NULL;
239         struct db_context *db = acl_db;
240         NTSTATUS status;
241         int ret = -1;
242
243         status = copy_smb_filename(talloc_tos(), smb_fname, &smb_fname_tmp);
244         if (!NT_STATUS_IS_OK(status)) {
245                 errno = map_errno_from_nt_status(status);
246                 goto out;
247         }
248
249         if (lp_posix_pathnames()) {
250                 ret = SMB_VFS_LSTAT(handle->conn, smb_fname_tmp);
251         } else {
252                 ret = SMB_VFS_STAT(handle->conn, smb_fname_tmp);
253         }
254
255         if (ret == -1) {
256                 goto out;
257         }
258
259         ret = unlink_acl_common(handle, smb_fname_tmp);
260
261         if (ret == -1) {
262                 goto out;
263         }
264
265         acl_tdb_delete(handle, db, &smb_fname_tmp->st);
266  out:
267         return ret;
268 }
269
270 /*********************************************************************
271  On rmdir we need to delete the tdb record (if using tdb).
272 *********************************************************************/
273
274 static int rmdir_acl_tdb(vfs_handle_struct *handle, const char *path)
275 {
276
277         SMB_STRUCT_STAT sbuf;
278         struct db_context *db = acl_db;
279         int ret = -1;
280
281         if (lp_posix_pathnames()) {
282                 ret = vfs_lstat_smb_fname(handle->conn, path, &sbuf);
283         } else {
284                 ret = vfs_stat_smb_fname(handle->conn, path, &sbuf);
285         }
286
287         if (ret == -1) {
288                 return -1;
289         }
290
291         ret = rmdir_acl_common(handle, path);
292         if (ret == -1) {
293                 return -1;
294         }
295
296         acl_tdb_delete(handle, db, &sbuf);
297         return 0;
298 }
299
300 /*******************************************************************
301  Handle opening the storage tdb if so configured.
302 *******************************************************************/
303
304 static int connect_acl_tdb(struct vfs_handle_struct *handle,
305                                 const char *service,
306                                 const char *user)
307 {
308         int ret = SMB_VFS_NEXT_CONNECT(handle, service, user);
309
310         if (ret < 0) {
311                 return ret;
312         }
313
314         if (!acl_tdb_init()) {
315                 SMB_VFS_NEXT_DISCONNECT(handle);
316                 return -1;
317         }
318
319         /* Ensure we have "inherit acls = yes" if we're
320          * using this module. */
321         DEBUG(2,("connect_acl_tdb: setting 'inherit acls = true' "
322                 "and 'dos filemode = true' for service %s\n",
323                 service ));
324         lp_do_parameter(SNUM(handle->conn), "inherit acls", "true");
325         lp_do_parameter(SNUM(handle->conn), "dos filemode", "true");
326
327         return 0;
328 }
329
330 /*********************************************************************
331  Remove a Windows ACL - we're setting the underlying POSIX ACL.
332 *********************************************************************/
333
334 static int sys_acl_set_file_tdb(vfs_handle_struct *handle,
335                               const char *path,
336                               SMB_ACL_TYPE_T type,
337                               SMB_ACL_T theacl)
338 {
339         SMB_STRUCT_STAT sbuf;
340         struct db_context *db = acl_db;
341         int ret = -1;
342
343         if (lp_posix_pathnames()) {
344                 ret = vfs_lstat_smb_fname(handle->conn, path, &sbuf);
345         } else {
346                 ret = vfs_stat_smb_fname(handle->conn, path, &sbuf);
347         }
348
349         if (ret == -1) {
350                 return -1;
351         }
352
353         ret = SMB_VFS_NEXT_SYS_ACL_SET_FILE(handle,
354                                                 path,
355                                                 type,
356                                                 theacl);
357         if (ret == -1) {
358                 return -1;
359         }
360
361         acl_tdb_delete(handle, db, &sbuf);
362         return 0;
363 }
364
365 /*********************************************************************
366  Remove a Windows ACL - we're setting the underlying POSIX ACL.
367 *********************************************************************/
368
369 static int sys_acl_set_fd_tdb(vfs_handle_struct *handle,
370                             files_struct *fsp,
371                             SMB_ACL_T theacl)
372 {
373         struct db_context *db = acl_db;
374         NTSTATUS status;
375         int ret;
376
377         status = vfs_stat_fsp(fsp);
378         if (!NT_STATUS_IS_OK(status)) {
379                 return -1;
380         }
381
382         ret = SMB_VFS_NEXT_SYS_ACL_SET_FD(handle,
383                                                 fsp,
384                                                 theacl);
385         if (ret == -1) {
386                 return -1;
387         }
388
389         acl_tdb_delete(handle, db, &fsp->fsp_name->st);
390         return 0;
391 }
392
393 static struct vfs_fn_pointers vfs_acl_tdb_fns = {
394         .connect_fn = connect_acl_tdb,
395         .disconnect = disconnect_acl_tdb,
396         .opendir = opendir_acl_common,
397         .mkdir = mkdir_acl_common,
398         .open = open_acl_common,
399         .create_file = create_file_acl_common,
400         .unlink = unlink_acl_tdb,
401         .rmdir = rmdir_acl_tdb,
402         .fget_nt_acl = fget_nt_acl_common,
403         .get_nt_acl = get_nt_acl_common,
404         .fset_nt_acl = fset_nt_acl_common,
405         .sys_acl_set_file = sys_acl_set_file_tdb,
406         .sys_acl_set_fd = sys_acl_set_fd_tdb
407 };
408
409 NTSTATUS vfs_acl_tdb_init(void)
410 {
411         return smb_register_vfs(SMB_VFS_INTERFACE_VERSION, "acl_tdb",
412                                 &vfs_acl_tdb_fns);
413 }