summaryrefslogtreecommitdiff
path: root/source3/modules/vfs_acl_tdb.c
blob: 778e837be73c1c2718e69339de6417934c759f05 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
/*
 * Store Windows ACLs in a tdb.
 *
 * Copyright (C) Volker Lendecke, 2008
 * Copyright (C) Jeremy Allison, 2008
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, see <http://www.gnu.org/licenses/>.
 */

#include "includes.h"
#include "smbd/smbd.h"
#include "system/filesys.h"
#include "librpc/gen_ndr/xattr.h"
#include "librpc/gen_ndr/ndr_xattr.h"
#include "../lib/crypto/crypto.h"
#include "dbwrap/dbwrap.h"
#include "dbwrap/dbwrap_open.h"
#include "auth.h"
#include "util_tdb.h"

#undef DBGC_CLASS
#define DBGC_CLASS DBGC_VFS

#define ACL_MODULE_NAME "acl_tdb"
#include "modules/vfs_acl_common.c"

static unsigned int ref_count;
static struct db_context *acl_db;

/*******************************************************************
 Open acl_db if not already open, increment ref count.
*******************************************************************/

static bool acl_tdb_init(void)
{
	char *dbname;

	if (acl_db) {
		ref_count++;
		return true;
	}

	dbname = state_path("file_ntacls.tdb");

	if (dbname == NULL) {
		errno = ENOSYS;
		return false;
	}

	become_root();
	acl_db = db_open(NULL, dbname, 0, TDB_DEFAULT, O_RDWR|O_CREAT, 0600);
	unbecome_root();

	if (acl_db == NULL) {
#if defined(ENOTSUP)
		errno = ENOTSUP;
#else
		errno = ENOSYS;
#endif
		TALLOC_FREE(dbname);
		return false;
	}

	ref_count++;
	TALLOC_FREE(dbname);
	return true;
}

/*******************************************************************
 Lower ref count and close acl_db if zero.
*******************************************************************/

static void disconnect_acl_tdb(struct vfs_handle_struct *handle)
{
	SMB_VFS_NEXT_DISCONNECT(handle);
	ref_count--;
	if (ref_count == 0) {
		TALLOC_FREE(acl_db);
	}
}

/*******************************************************************
 Fetch_lock the tdb acl record for a file
*******************************************************************/

static struct db_record *acl_tdb_lock(TALLOC_CTX *mem_ctx,
					struct db_context *db,
					const struct file_id *id)
{
	uint8 id_buf[16];

	/* For backwards compatibility only store the dev/inode. */
	push_file_id_16((char *)id_buf, id);
	return dbwrap_fetch_locked(db,
				   mem_ctx,
				   make_tdb_data(id_buf,
						 sizeof(id_buf)));
}

/*******************************************************************
 Delete the tdb acl record for a file
*******************************************************************/

static NTSTATUS acl_tdb_delete(vfs_handle_struct *handle,
				struct db_context *db,
				SMB_STRUCT_STAT *psbuf)
{
	NTSTATUS status;
	struct file_id id = vfs_file_id_from_sbuf(handle->conn, psbuf);
	struct db_record *rec = acl_tdb_lock(talloc_tos(), db, &id);

	/*
	 * If rec == NULL there's not much we can do about it
	 */

	if (rec == NULL) {
		DEBUG(10,("acl_tdb_delete: rec == NULL\n"));
		TALLOC_FREE(rec);
		return NT_STATUS_OK;
	}

	status = dbwrap_record_delete(rec);
	TALLOC_FREE(rec);
	return status;
}

/*******************************************************************
 Pull a security descriptor into a DATA_BLOB from a tdb store.
*******************************************************************/

static NTSTATUS get_acl_blob(TALLOC_CTX *ctx,
			vfs_handle_struct *handle,
			files_struct *fsp,
			const char *name,
			DATA_BLOB *pblob)
{
	uint8 id_buf[16];
	TDB_DATA data;
	struct file_id id;
	struct db_context *db = acl_db;
	NTSTATUS status = NT_STATUS_OK;
	SMB_STRUCT_STAT sbuf;

	ZERO_STRUCT(sbuf);

	if (fsp) {
		status = vfs_stat_fsp(fsp);
		sbuf = fsp->fsp_name->st;
	} else {
		int ret = vfs_stat_smb_fname(handle->conn, name, &sbuf);
		if (ret == -1) {
			status = map_nt_error_from_unix(errno);
		}
	}

	if (!NT_STATUS_IS_OK(status)) {
		return status;
	}

	id = vfs_file_id_from_sbuf(handle->conn, &sbuf);

	/* For backwards compatibility only store the dev/inode. */
	push_file_id_16((char *)id_buf, &id);

	status = dbwrap_fetch(db,
			      ctx,
			      make_tdb_data(id_buf, sizeof(id_buf)),
			      &data);
	if (!NT_STATUS_IS_OK(status)) {
		return NT_STATUS_INTERNAL_DB_CORRUPTION;
	}

	pblob->data = data.dptr;
	pblob->length = data.dsize;

	DEBUG(10,("get_acl_blob: returned %u bytes from file %s\n",
		(unsigned int)data.dsize, name ));

	if (pblob->length == 0 || pblob->data == NULL) {
		return NT_STATUS_NOT_FOUND;
	}
	return NT_STATUS_OK;
}

/*******************************************************************
 Store a DATA_BLOB into a tdb record given an fsp pointer.
*******************************************************************/

static NTSTATUS store_acl_blob_fsp(vfs_handle_struct *handle,
				files_struct *fsp,
				DATA_BLOB *pblob)
{
	uint8 id_buf[16];
	struct file_id id;
	TDB_DATA data;
	struct db_context *db = acl_db;
	struct db_record *rec;
	NTSTATUS status;

	DEBUG(10,("store_acl_blob_fsp: storing blob length %u on file %s\n",
		  (unsigned int)pblob->length, fsp_str_dbg(fsp)));

	status = vfs_stat_fsp(fsp);
	if (!NT_STATUS_IS_OK(status)) {
		return status;
	}

	id = vfs_file_id_from_sbuf(handle->conn, &fsp->fsp_name->st);

	/* For backwards compatibility only store the dev/inode. */
	push_file_id_16((char *)id_buf, &id);
	rec = dbwrap_fetch_locked(db, talloc_tos(),
				  make_tdb_data(id_buf,
						sizeof(id_buf)));
	if (rec == NULL) {
		DEBUG(0, ("store_acl_blob_fsp_tdb: fetch_lock failed\n"));
		return NT_STATUS_INTERNAL_DB_CORRUPTION;
	}
	data.dptr = pblob->data;
	data.dsize = pblob->length;
	return dbwrap_record_store(rec, data, 0);
}

/*********************************************************************
 On unlink we need to delete the tdb record (if using tdb).
*********************************************************************/

static int unlink_acl_tdb(vfs_handle_struct *handle,
			  const struct smb_filename *smb_fname)
{
	struct smb_filename *smb_fname_tmp = NULL;
	struct db_context *db = acl_db;
	NTSTATUS status;
	int ret = -1;

	status = copy_smb_filename(talloc_tos(), smb_fname, &smb_fname_tmp);
	if (!NT_STATUS_IS_OK(status)) {
		errno = map_errno_from_nt_status(status);
		goto out;
	}

	if (lp_posix_pathnames()) {
		ret = SMB_VFS_LSTAT(handle->conn, smb_fname_tmp);
	} else {
		ret = SMB_VFS_STAT(handle->conn, smb_fname_tmp);
	}

	if (ret == -1) {
		goto out;
	}

	ret = unlink_acl_common(handle, smb_fname_tmp);

	if (ret == -1) {
		goto out;
	}

	acl_tdb_delete(handle, db, &smb_fname_tmp->st);
 out:
	return ret;
}

/*********************************************************************
 On rmdir we need to delete the tdb record (if using tdb).
*********************************************************************/

static int rmdir_acl_tdb(vfs_handle_struct *handle, const char *path)
{

	SMB_STRUCT_STAT sbuf;
	struct db_context *db = acl_db;
	int ret = -1;

	if (lp_posix_pathnames()) {
		ret = vfs_lstat_smb_fname(handle->conn, path, &sbuf);
	} else {
		ret = vfs_stat_smb_fname(handle->conn, path, &sbuf);
	}

	if (ret == -1) {
		return -1;
	}

	ret = rmdir_acl_common(handle, path);
	if (ret == -1) {
		return -1;
	}

	acl_tdb_delete(handle, db, &sbuf);
	return 0;
}

/*******************************************************************
 Handle opening the storage tdb if so configured.
*******************************************************************/

static int connect_acl_tdb(struct vfs_handle_struct *handle,
				const char *service,
				const char *user)
{
	int ret = SMB_VFS_NEXT_CONNECT(handle, service, user);

	if (ret < 0) {
		return ret;
	}

	if (!acl_tdb_init()) {
		SMB_VFS_NEXT_DISCONNECT(handle);
		return -1;
	}

	/* Ensure we have the parameters correct if we're
	 * using this module. */
	DEBUG(2,("connect_acl_tdb: setting 'inherit acls = true' "
		"'dos filemode = true' and "
		"'force unknown acl user = true' for service %s\n",
		service ));

	lp_do_parameter(SNUM(handle->conn), "inherit acls", "true");
	lp_do_parameter(SNUM(handle->conn), "dos filemode", "true");
	lp_do_parameter(SNUM(handle->conn), "force unknown acl user", "true");

	return 0;
}

/*********************************************************************
 Remove a Windows ACL - we're setting the underlying POSIX ACL.
*********************************************************************/

static int sys_acl_set_file_tdb(vfs_handle_struct *handle,
                              const char *path,
                              SMB_ACL_TYPE_T type,
                              SMB_ACL_T theacl)
{
	SMB_STRUCT_STAT sbuf;
	struct db_context *db = acl_db;
	int ret = -1;

	if (lp_posix_pathnames()) {
		ret = vfs_lstat_smb_fname(handle->conn, path, &sbuf);
	} else {
		ret = vfs_stat_smb_fname(handle->conn, path, &sbuf);
	}

	if (ret == -1) {
		return -1;
	}

	ret = SMB_VFS_NEXT_SYS_ACL_SET_FILE(handle,
						path,
						type,
						theacl);
	if (ret == -1) {
		return -1;
	}

	acl_tdb_delete(handle, db, &sbuf);
	return 0;
}

/*********************************************************************
 Remove a Windows ACL - we're setting the underlying POSIX ACL.
*********************************************************************/

static int sys_acl_set_fd_tdb(vfs_handle_struct *handle,
                            files_struct *fsp,
                            SMB_ACL_T theacl)
{
	struct db_context *db = acl_db;
	NTSTATUS status;
	int ret;

	status = vfs_stat_fsp(fsp);
	if (!NT_STATUS_IS_OK(status)) {
		return -1;
	}

	ret = SMB_VFS_NEXT_SYS_ACL_SET_FD(handle,
						fsp,
						theacl);
	if (ret == -1) {
		return -1;
	}

	acl_tdb_delete(handle, db, &fsp->fsp_name->st);
	return 0;
}

static struct vfs_fn_pointers vfs_acl_tdb_fns = {
	.connect_fn = connect_acl_tdb,
	.disconnect = disconnect_acl_tdb,
	.opendir = opendir_acl_common,
	.mkdir = mkdir_acl_common,
	.rmdir = rmdir_acl_tdb,
	.open_fn = open_acl_common,
	.create_file = create_file_acl_common,
	.unlink = unlink_acl_tdb,
	.chmod = chmod_acl_module_common,
	.fchmod = fchmod_acl_module_common,
	.fget_nt_acl = fget_nt_acl_common,
	.get_nt_acl = get_nt_acl_common,
	.fset_nt_acl = fset_nt_acl_common,
	.chmod_acl = chmod_acl_acl_module_common,
	.fchmod_acl = fchmod_acl_acl_module_common,
	.sys_acl_set_file = sys_acl_set_file_tdb,
	.sys_acl_set_fd = sys_acl_set_fd_tdb
};

NTSTATUS vfs_acl_tdb_init(void)
{
	return smb_register_vfs(SMB_VFS_INTERFACE_VERSION, "acl_tdb",
				&vfs_acl_tdb_fns);
}