s3-vfs: rename open function to open_fn.
[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 "smbd/smbd.h"
25 #include "system/filesys.h"
26 #include "librpc/gen_ndr/xattr.h"
27 #include "librpc/gen_ndr/ndr_xattr.h"
28 #include "../lib/crypto/crypto.h"
29 #include "dbwrap.h"
30 #include "auth.h"
31
32 #undef DBGC_CLASS
33 #define DBGC_CLASS DBGC_VFS
34
35 #define ACL_MODULE_NAME "acl_tdb"
36 #include "modules/vfs_acl_common.c"
37
38 static unsigned int ref_count;
39 static struct db_context *acl_db;
40
41 /*******************************************************************
42  Open acl_db if not already open, increment ref count.
43 *******************************************************************/
44
45 static bool acl_tdb_init(void)
46 {
47         char *dbname;
48
49         if (acl_db) {
50                 ref_count++;
51                 return true;
52         }
53
54         dbname = state_path("file_ntacls.tdb");
55
56         if (dbname == NULL) {
57                 errno = ENOSYS;
58                 return false;
59         }
60
61         become_root();
62         acl_db = db_open(NULL, dbname, 0, TDB_DEFAULT, O_RDWR|O_CREAT, 0600);
63         unbecome_root();
64
65         if (acl_db == NULL) {
66 #if defined(ENOTSUP)
67                 errno = ENOTSUP;
68 #else
69                 errno = ENOSYS;
70 #endif
71                 TALLOC_FREE(dbname);
72                 return false;
73         }
74
75         ref_count++;
76         TALLOC_FREE(dbname);
77         return true;
78 }
79
80 /*******************************************************************
81  Lower ref count and close acl_db if zero.
82 *******************************************************************/
83
84 static void disconnect_acl_tdb(struct vfs_handle_struct *handle)
85 {
86         SMB_VFS_NEXT_DISCONNECT(handle);
87         ref_count--;
88         if (ref_count == 0) {
89                 TALLOC_FREE(acl_db);
90         }
91 }
92
93 /*******************************************************************
94  Fetch_lock the tdb acl record for a file
95 *******************************************************************/
96
97 static struct db_record *acl_tdb_lock(TALLOC_CTX *mem_ctx,
98                                         struct db_context *db,
99                                         const struct file_id *id)
100 {
101         uint8 id_buf[16];
102
103         /* For backwards compatibility only store the dev/inode. */
104         push_file_id_16((char *)id_buf, id);
105         return db->fetch_locked(db,
106                                 mem_ctx,
107                                 make_tdb_data(id_buf,
108                                         sizeof(id_buf)));
109 }
110
111 /*******************************************************************
112  Delete the tdb acl record for a file
113 *******************************************************************/
114
115 static NTSTATUS acl_tdb_delete(vfs_handle_struct *handle,
116                                 struct db_context *db,
117                                 SMB_STRUCT_STAT *psbuf)
118 {
119         NTSTATUS status;
120         struct file_id id = vfs_file_id_from_sbuf(handle->conn, psbuf);
121         struct db_record *rec = acl_tdb_lock(talloc_tos(), db, &id);
122
123         /*
124          * If rec == NULL there's not much we can do about it
125          */
126
127         if (rec == NULL) {
128                 DEBUG(10,("acl_tdb_delete: rec == NULL\n"));
129                 TALLOC_FREE(rec);
130                 return NT_STATUS_OK;
131         }
132
133         status = rec->delete_rec(rec);
134         TALLOC_FREE(rec);
135         return status;
136 }
137
138 /*******************************************************************
139  Pull a security descriptor into a DATA_BLOB from a tdb store.
140 *******************************************************************/
141
142 static NTSTATUS get_acl_blob(TALLOC_CTX *ctx,
143                         vfs_handle_struct *handle,
144                         files_struct *fsp,
145                         const char *name,
146                         DATA_BLOB *pblob)
147 {
148         uint8 id_buf[16];
149         TDB_DATA data;
150         struct file_id id;
151         struct db_context *db = acl_db;
152         NTSTATUS status = NT_STATUS_OK;
153         SMB_STRUCT_STAT sbuf;
154
155         ZERO_STRUCT(sbuf);
156
157         if (fsp) {
158                 status = vfs_stat_fsp(fsp);
159                 sbuf = fsp->fsp_name->st;
160         } else {
161                 int ret = vfs_stat_smb_fname(handle->conn, name, &sbuf);
162                 if (ret == -1) {
163                         status = map_nt_error_from_unix(errno);
164                 }
165         }
166
167         if (!NT_STATUS_IS_OK(status)) {
168                 return status;
169         }
170
171         id = vfs_file_id_from_sbuf(handle->conn, &sbuf);
172
173         /* For backwards compatibility only store the dev/inode. */
174         push_file_id_16((char *)id_buf, &id);
175
176         if (db->fetch(db,
177                         ctx,
178                         make_tdb_data(id_buf, sizeof(id_buf)),
179                         &data) == -1) {
180                 return NT_STATUS_INTERNAL_DB_CORRUPTION;
181         }
182
183         pblob->data = data.dptr;
184         pblob->length = data.dsize;
185
186         DEBUG(10,("get_acl_blob: returned %u bytes from file %s\n",
187                 (unsigned int)data.dsize, name ));
188
189         if (pblob->length == 0 || pblob->data == NULL) {
190                 return NT_STATUS_NOT_FOUND;
191         }
192         return NT_STATUS_OK;
193 }
194
195 /*******************************************************************
196  Store a DATA_BLOB into a tdb record given an fsp pointer.
197 *******************************************************************/
198
199 static NTSTATUS store_acl_blob_fsp(vfs_handle_struct *handle,
200                                 files_struct *fsp,
201                                 DATA_BLOB *pblob)
202 {
203         uint8 id_buf[16];
204         struct file_id id;
205         TDB_DATA data;
206         struct db_context *db = acl_db;
207         struct db_record *rec;
208         NTSTATUS status;
209
210         DEBUG(10,("store_acl_blob_fsp: storing blob length %u on file %s\n",
211                   (unsigned int)pblob->length, fsp_str_dbg(fsp)));
212
213         status = vfs_stat_fsp(fsp);
214         if (!NT_STATUS_IS_OK(status)) {
215                 return status;
216         }
217
218         id = vfs_file_id_from_sbuf(handle->conn, &fsp->fsp_name->st);
219
220         /* For backwards compatibility only store the dev/inode. */
221         push_file_id_16((char *)id_buf, &id);
222         rec = db->fetch_locked(db, talloc_tos(),
223                                 make_tdb_data(id_buf,
224                                         sizeof(id_buf)));
225         if (rec == NULL) {
226                 DEBUG(0, ("store_acl_blob_fsp_tdb: fetch_lock failed\n"));
227                 return NT_STATUS_INTERNAL_DB_CORRUPTION;
228         }
229         data.dptr = pblob->data;
230         data.dsize = pblob->length;
231         return rec->store(rec, data, 0);
232 }
233
234 /*********************************************************************
235  On unlink we need to delete the tdb record (if using tdb).
236 *********************************************************************/
237
238 static int unlink_acl_tdb(vfs_handle_struct *handle,
239                           const struct smb_filename *smb_fname)
240 {
241         struct smb_filename *smb_fname_tmp = NULL;
242         struct db_context *db = acl_db;
243         NTSTATUS status;
244         int ret = -1;
245
246         status = copy_smb_filename(talloc_tos(), smb_fname, &smb_fname_tmp);
247         if (!NT_STATUS_IS_OK(status)) {
248                 errno = map_errno_from_nt_status(status);
249                 goto out;
250         }
251
252         if (lp_posix_pathnames()) {
253                 ret = SMB_VFS_LSTAT(handle->conn, smb_fname_tmp);
254         } else {
255                 ret = SMB_VFS_STAT(handle->conn, smb_fname_tmp);
256         }
257
258         if (ret == -1) {
259                 goto out;
260         }
261
262         ret = unlink_acl_common(handle, smb_fname_tmp);
263
264         if (ret == -1) {
265                 goto out;
266         }
267
268         acl_tdb_delete(handle, db, &smb_fname_tmp->st);
269  out:
270         return ret;
271 }
272
273 /*********************************************************************
274  On rmdir we need to delete the tdb record (if using tdb).
275 *********************************************************************/
276
277 static int rmdir_acl_tdb(vfs_handle_struct *handle, const char *path)
278 {
279
280         SMB_STRUCT_STAT sbuf;
281         struct db_context *db = acl_db;
282         int ret = -1;
283
284         if (lp_posix_pathnames()) {
285                 ret = vfs_lstat_smb_fname(handle->conn, path, &sbuf);
286         } else {
287                 ret = vfs_stat_smb_fname(handle->conn, path, &sbuf);
288         }
289
290         if (ret == -1) {
291                 return -1;
292         }
293
294         ret = rmdir_acl_common(handle, path);
295         if (ret == -1) {
296                 return -1;
297         }
298
299         acl_tdb_delete(handle, db, &sbuf);
300         return 0;
301 }
302
303 /*******************************************************************
304  Handle opening the storage tdb if so configured.
305 *******************************************************************/
306
307 static int connect_acl_tdb(struct vfs_handle_struct *handle,
308                                 const char *service,
309                                 const char *user)
310 {
311         int ret = SMB_VFS_NEXT_CONNECT(handle, service, user);
312
313         if (ret < 0) {
314                 return ret;
315         }
316
317         if (!acl_tdb_init()) {
318                 SMB_VFS_NEXT_DISCONNECT(handle);
319                 return -1;
320         }
321
322         /* Ensure we have the parameters correct if we're
323          * using this module. */
324         DEBUG(2,("connect_acl_tdb: setting 'inherit acls = true' "
325                 "'dos filemode = true' and "
326                 "'force unknown acl user = true' for service %s\n",
327                 service ));
328
329         lp_do_parameter(SNUM(handle->conn), "inherit acls", "true");
330         lp_do_parameter(SNUM(handle->conn), "dos filemode", "true");
331         lp_do_parameter(SNUM(handle->conn), "force unknown acl user", "true");
332
333         return 0;
334 }
335
336 /*********************************************************************
337  Remove a Windows ACL - we're setting the underlying POSIX ACL.
338 *********************************************************************/
339
340 static int sys_acl_set_file_tdb(vfs_handle_struct *handle,
341                               const char *path,
342                               SMB_ACL_TYPE_T type,
343                               SMB_ACL_T theacl)
344 {
345         SMB_STRUCT_STAT sbuf;
346         struct db_context *db = acl_db;
347         int ret = -1;
348
349         if (lp_posix_pathnames()) {
350                 ret = vfs_lstat_smb_fname(handle->conn, path, &sbuf);
351         } else {
352                 ret = vfs_stat_smb_fname(handle->conn, path, &sbuf);
353         }
354
355         if (ret == -1) {
356                 return -1;
357         }
358
359         ret = SMB_VFS_NEXT_SYS_ACL_SET_FILE(handle,
360                                                 path,
361                                                 type,
362                                                 theacl);
363         if (ret == -1) {
364                 return -1;
365         }
366
367         acl_tdb_delete(handle, db, &sbuf);
368         return 0;
369 }
370
371 /*********************************************************************
372  Remove a Windows ACL - we're setting the underlying POSIX ACL.
373 *********************************************************************/
374
375 static int sys_acl_set_fd_tdb(vfs_handle_struct *handle,
376                             files_struct *fsp,
377                             SMB_ACL_T theacl)
378 {
379         struct db_context *db = acl_db;
380         NTSTATUS status;
381         int ret;
382
383         status = vfs_stat_fsp(fsp);
384         if (!NT_STATUS_IS_OK(status)) {
385                 return -1;
386         }
387
388         ret = SMB_VFS_NEXT_SYS_ACL_SET_FD(handle,
389                                                 fsp,
390                                                 theacl);
391         if (ret == -1) {
392                 return -1;
393         }
394
395         acl_tdb_delete(handle, db, &fsp->fsp_name->st);
396         return 0;
397 }
398
399 static struct vfs_fn_pointers vfs_acl_tdb_fns = {
400         .connect_fn = connect_acl_tdb,
401         .disconnect = disconnect_acl_tdb,
402         .opendir = opendir_acl_common,
403         .mkdir = mkdir_acl_common,
404         .rmdir = rmdir_acl_tdb,
405         .open_fn = open_acl_common,
406         .create_file = create_file_acl_common,
407         .unlink = unlink_acl_tdb,
408         .chmod = chmod_acl_module_common,
409         .fchmod = fchmod_acl_module_common,
410         .fget_nt_acl = fget_nt_acl_common,
411         .get_nt_acl = get_nt_acl_common,
412         .fset_nt_acl = fset_nt_acl_common,
413         .chmod_acl = chmod_acl_acl_module_common,
414         .fchmod_acl = fchmod_acl_acl_module_common,
415         .sys_acl_set_file = sys_acl_set_file_tdb,
416         .sys_acl_set_fd = sys_acl_set_fd_tdb
417 };
418
419 NTSTATUS vfs_acl_tdb_init(void)
420 {
421         return smb_register_vfs(SMB_VFS_INTERFACE_VERSION, "acl_tdb",
422                                 &vfs_acl_tdb_fns);
423 }