s3:dbwrap: move all .c and .h files of dbwrap to lib/dbwrap/
[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/dbwrap.h"
30 #include "dbwrap/dbwrap_open.h"
31 #include "auth.h"
32 #include "util_tdb.h"
33
34 #undef DBGC_CLASS
35 #define DBGC_CLASS DBGC_VFS
36
37 #define ACL_MODULE_NAME "acl_tdb"
38 #include "modules/vfs_acl_common.c"
39
40 static unsigned int ref_count;
41 static struct db_context *acl_db;
42
43 /*******************************************************************
44  Open acl_db if not already open, increment ref count.
45 *******************************************************************/
46
47 static bool acl_tdb_init(void)
48 {
49         char *dbname;
50
51         if (acl_db) {
52                 ref_count++;
53                 return true;
54         }
55
56         dbname = state_path("file_ntacls.tdb");
57
58         if (dbname == NULL) {
59                 errno = ENOSYS;
60                 return false;
61         }
62
63         become_root();
64         acl_db = db_open(NULL, dbname, 0, TDB_DEFAULT, O_RDWR|O_CREAT, 0600);
65         unbecome_root();
66
67         if (acl_db == NULL) {
68 #if defined(ENOTSUP)
69                 errno = ENOTSUP;
70 #else
71                 errno = ENOSYS;
72 #endif
73                 TALLOC_FREE(dbname);
74                 return false;
75         }
76
77         ref_count++;
78         TALLOC_FREE(dbname);
79         return true;
80 }
81
82 /*******************************************************************
83  Lower ref count and close acl_db if zero.
84 *******************************************************************/
85
86 static void disconnect_acl_tdb(struct vfs_handle_struct *handle)
87 {
88         SMB_VFS_NEXT_DISCONNECT(handle);
89         ref_count--;
90         if (ref_count == 0) {
91                 TALLOC_FREE(acl_db);
92         }
93 }
94
95 /*******************************************************************
96  Fetch_lock the tdb acl record for a file
97 *******************************************************************/
98
99 static struct db_record *acl_tdb_lock(TALLOC_CTX *mem_ctx,
100                                         struct db_context *db,
101                                         const struct file_id *id)
102 {
103         uint8 id_buf[16];
104
105         /* For backwards compatibility only store the dev/inode. */
106         push_file_id_16((char *)id_buf, id);
107         return db->fetch_locked(db,
108                                 mem_ctx,
109                                 make_tdb_data(id_buf,
110                                         sizeof(id_buf)));
111 }
112
113 /*******************************************************************
114  Delete the tdb acl record for a file
115 *******************************************************************/
116
117 static NTSTATUS acl_tdb_delete(vfs_handle_struct *handle,
118                                 struct db_context *db,
119                                 SMB_STRUCT_STAT *psbuf)
120 {
121         NTSTATUS status;
122         struct file_id id = vfs_file_id_from_sbuf(handle->conn, psbuf);
123         struct db_record *rec = acl_tdb_lock(talloc_tos(), db, &id);
124
125         /*
126          * If rec == NULL there's not much we can do about it
127          */
128
129         if (rec == NULL) {
130                 DEBUG(10,("acl_tdb_delete: rec == NULL\n"));
131                 TALLOC_FREE(rec);
132                 return NT_STATUS_OK;
133         }
134
135         status = rec->delete_rec(rec);
136         TALLOC_FREE(rec);
137         return status;
138 }
139
140 /*******************************************************************
141  Pull a security descriptor into a DATA_BLOB from a tdb store.
142 *******************************************************************/
143
144 static NTSTATUS get_acl_blob(TALLOC_CTX *ctx,
145                         vfs_handle_struct *handle,
146                         files_struct *fsp,
147                         const char *name,
148                         DATA_BLOB *pblob)
149 {
150         uint8 id_buf[16];
151         TDB_DATA data;
152         struct file_id id;
153         struct db_context *db = acl_db;
154         NTSTATUS status = NT_STATUS_OK;
155         SMB_STRUCT_STAT sbuf;
156
157         ZERO_STRUCT(sbuf);
158
159         if (fsp) {
160                 status = vfs_stat_fsp(fsp);
161                 sbuf = fsp->fsp_name->st;
162         } else {
163                 int ret = vfs_stat_smb_fname(handle->conn, name, &sbuf);
164                 if (ret == -1) {
165                         status = map_nt_error_from_unix(errno);
166                 }
167         }
168
169         if (!NT_STATUS_IS_OK(status)) {
170                 return status;
171         }
172
173         id = vfs_file_id_from_sbuf(handle->conn, &sbuf);
174
175         /* For backwards compatibility only store the dev/inode. */
176         push_file_id_16((char *)id_buf, &id);
177
178         if (db->fetch(db,
179                         ctx,
180                         make_tdb_data(id_buf, sizeof(id_buf)),
181                         &data) != 0) {
182                 return NT_STATUS_INTERNAL_DB_CORRUPTION;
183         }
184
185         pblob->data = data.dptr;
186         pblob->length = data.dsize;
187
188         DEBUG(10,("get_acl_blob: returned %u bytes from file %s\n",
189                 (unsigned int)data.dsize, name ));
190
191         if (pblob->length == 0 || pblob->data == NULL) {
192                 return NT_STATUS_NOT_FOUND;
193         }
194         return NT_STATUS_OK;
195 }
196
197 /*******************************************************************
198  Store a DATA_BLOB into a tdb record given an fsp pointer.
199 *******************************************************************/
200
201 static NTSTATUS store_acl_blob_fsp(vfs_handle_struct *handle,
202                                 files_struct *fsp,
203                                 DATA_BLOB *pblob)
204 {
205         uint8 id_buf[16];
206         struct file_id id;
207         TDB_DATA data;
208         struct db_context *db = acl_db;
209         struct db_record *rec;
210         NTSTATUS status;
211
212         DEBUG(10,("store_acl_blob_fsp: storing blob length %u on file %s\n",
213                   (unsigned int)pblob->length, fsp_str_dbg(fsp)));
214
215         status = vfs_stat_fsp(fsp);
216         if (!NT_STATUS_IS_OK(status)) {
217                 return status;
218         }
219
220         id = vfs_file_id_from_sbuf(handle->conn, &fsp->fsp_name->st);
221
222         /* For backwards compatibility only store the dev/inode. */
223         push_file_id_16((char *)id_buf, &id);
224         rec = db->fetch_locked(db, talloc_tos(),
225                                 make_tdb_data(id_buf,
226                                         sizeof(id_buf)));
227         if (rec == NULL) {
228                 DEBUG(0, ("store_acl_blob_fsp_tdb: fetch_lock failed\n"));
229                 return NT_STATUS_INTERNAL_DB_CORRUPTION;
230         }
231         data.dptr = pblob->data;
232         data.dsize = pblob->length;
233         return rec->store(rec, data, 0);
234 }
235
236 /*********************************************************************
237  On unlink we need to delete the tdb record (if using tdb).
238 *********************************************************************/
239
240 static int unlink_acl_tdb(vfs_handle_struct *handle,
241                           const struct smb_filename *smb_fname)
242 {
243         struct smb_filename *smb_fname_tmp = NULL;
244         struct db_context *db = acl_db;
245         NTSTATUS status;
246         int ret = -1;
247
248         status = copy_smb_filename(talloc_tos(), smb_fname, &smb_fname_tmp);
249         if (!NT_STATUS_IS_OK(status)) {
250                 errno = map_errno_from_nt_status(status);
251                 goto out;
252         }
253
254         if (lp_posix_pathnames()) {
255                 ret = SMB_VFS_LSTAT(handle->conn, smb_fname_tmp);
256         } else {
257                 ret = SMB_VFS_STAT(handle->conn, smb_fname_tmp);
258         }
259
260         if (ret == -1) {
261                 goto out;
262         }
263
264         ret = unlink_acl_common(handle, smb_fname_tmp);
265
266         if (ret == -1) {
267                 goto out;
268         }
269
270         acl_tdb_delete(handle, db, &smb_fname_tmp->st);
271  out:
272         return ret;
273 }
274
275 /*********************************************************************
276  On rmdir we need to delete the tdb record (if using tdb).
277 *********************************************************************/
278
279 static int rmdir_acl_tdb(vfs_handle_struct *handle, const char *path)
280 {
281
282         SMB_STRUCT_STAT sbuf;
283         struct db_context *db = acl_db;
284         int ret = -1;
285
286         if (lp_posix_pathnames()) {
287                 ret = vfs_lstat_smb_fname(handle->conn, path, &sbuf);
288         } else {
289                 ret = vfs_stat_smb_fname(handle->conn, path, &sbuf);
290         }
291
292         if (ret == -1) {
293                 return -1;
294         }
295
296         ret = rmdir_acl_common(handle, path);
297         if (ret == -1) {
298                 return -1;
299         }
300
301         acl_tdb_delete(handle, db, &sbuf);
302         return 0;
303 }
304
305 /*******************************************************************
306  Handle opening the storage tdb if so configured.
307 *******************************************************************/
308
309 static int connect_acl_tdb(struct vfs_handle_struct *handle,
310                                 const char *service,
311                                 const char *user)
312 {
313         int ret = SMB_VFS_NEXT_CONNECT(handle, service, user);
314
315         if (ret < 0) {
316                 return ret;
317         }
318
319         if (!acl_tdb_init()) {
320                 SMB_VFS_NEXT_DISCONNECT(handle);
321                 return -1;
322         }
323
324         /* Ensure we have the parameters correct if we're
325          * using this module. */
326         DEBUG(2,("connect_acl_tdb: setting 'inherit acls = true' "
327                 "'dos filemode = true' and "
328                 "'force unknown acl user = true' for service %s\n",
329                 service ));
330
331         lp_do_parameter(SNUM(handle->conn), "inherit acls", "true");
332         lp_do_parameter(SNUM(handle->conn), "dos filemode", "true");
333         lp_do_parameter(SNUM(handle->conn), "force unknown acl user", "true");
334
335         return 0;
336 }
337
338 /*********************************************************************
339  Remove a Windows ACL - we're setting the underlying POSIX ACL.
340 *********************************************************************/
341
342 static int sys_acl_set_file_tdb(vfs_handle_struct *handle,
343                               const char *path,
344                               SMB_ACL_TYPE_T type,
345                               SMB_ACL_T theacl)
346 {
347         SMB_STRUCT_STAT sbuf;
348         struct db_context *db = acl_db;
349         int ret = -1;
350
351         if (lp_posix_pathnames()) {
352                 ret = vfs_lstat_smb_fname(handle->conn, path, &sbuf);
353         } else {
354                 ret = vfs_stat_smb_fname(handle->conn, path, &sbuf);
355         }
356
357         if (ret == -1) {
358                 return -1;
359         }
360
361         ret = SMB_VFS_NEXT_SYS_ACL_SET_FILE(handle,
362                                                 path,
363                                                 type,
364                                                 theacl);
365         if (ret == -1) {
366                 return -1;
367         }
368
369         acl_tdb_delete(handle, db, &sbuf);
370         return 0;
371 }
372
373 /*********************************************************************
374  Remove a Windows ACL - we're setting the underlying POSIX ACL.
375 *********************************************************************/
376
377 static int sys_acl_set_fd_tdb(vfs_handle_struct *handle,
378                             files_struct *fsp,
379                             SMB_ACL_T theacl)
380 {
381         struct db_context *db = acl_db;
382         NTSTATUS status;
383         int ret;
384
385         status = vfs_stat_fsp(fsp);
386         if (!NT_STATUS_IS_OK(status)) {
387                 return -1;
388         }
389
390         ret = SMB_VFS_NEXT_SYS_ACL_SET_FD(handle,
391                                                 fsp,
392                                                 theacl);
393         if (ret == -1) {
394                 return -1;
395         }
396
397         acl_tdb_delete(handle, db, &fsp->fsp_name->st);
398         return 0;
399 }
400
401 static struct vfs_fn_pointers vfs_acl_tdb_fns = {
402         .connect_fn = connect_acl_tdb,
403         .disconnect = disconnect_acl_tdb,
404         .opendir = opendir_acl_common,
405         .mkdir = mkdir_acl_common,
406         .rmdir = rmdir_acl_tdb,
407         .open_fn = open_acl_common,
408         .create_file = create_file_acl_common,
409         .unlink = unlink_acl_tdb,
410         .chmod = chmod_acl_module_common,
411         .fchmod = fchmod_acl_module_common,
412         .fget_nt_acl = fget_nt_acl_common,
413         .get_nt_acl = get_nt_acl_common,
414         .fset_nt_acl = fset_nt_acl_common,
415         .chmod_acl = chmod_acl_acl_module_common,
416         .fchmod_acl = fchmod_acl_acl_module_common,
417         .sys_acl_set_file = sys_acl_set_file_tdb,
418         .sys_acl_set_fd = sys_acl_set_fd_tdb
419 };
420
421 NTSTATUS vfs_acl_tdb_init(void)
422 {
423         return smb_register_vfs(SMB_VFS_INTERFACE_VERSION, "acl_tdb",
424                                 &vfs_acl_tdb_fns);
425 }