summaryrefslogtreecommitdiff
path: root/source4/dsdb/samdb/ldb_modules/secrets_tdb_sync.c
blob: e90fc77068f0424e4882d1478fb2f2a0b251b22d (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
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
/*
   ldb database library

   Copyright (C) Andrew Bartlett <abartlet@samba.org> 2007-2012

   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/>.
*/

/*
 *  Name: ldb
 *
 *  Component: ldb secrets_tdb_sync module
 *
 *  Description: Update secrets.tdb whenever the matching secret record changes
 *
 *  Author: Andrew Bartlett
 */

#include "includes.h"
#include "ldb_module.h"
#include "lib/util/dlinklist.h"
#include "auth/credentials/credentials.h"
#include "auth/credentials/credentials_krb5.h"
#include "system/kerberos.h"
#include "auth/kerberos/kerberos.h"
#include "auth/kerberos/kerberos_srv_keytab.h"
#include "dsdb/samdb/ldb_modules/util.h"
#include "param/secrets.h"
#include "source3/include/secrets.h"
#include "lib/dbwrap/dbwrap.h"
#include "dsdb/samdb/samdb.h"

struct dn_list {
	struct ldb_message *msg;
	bool do_delete;
	struct dn_list *prev, *next;
};

struct secrets_tdb_sync_private {
	struct dn_list *changed_dns;
	struct db_context *secrets_tdb;
};

struct secrets_tdb_sync_ctx {
	struct ldb_module *module;
	struct ldb_request *req;

	struct ldb_dn *dn;
	bool do_delete;

	struct ldb_reply *op_reply;
	bool found;
};

static struct secrets_tdb_sync_ctx *secrets_tdb_sync_ctx_init(struct ldb_module *module,
						struct ldb_request *req)
{
	struct secrets_tdb_sync_ctx *ac;

	ac = talloc_zero(req, struct secrets_tdb_sync_ctx);
	if (ac == NULL) {
		ldb_oom(ldb_module_get_ctx(module));
		return NULL;
	}

	ac->module = module;
	ac->req = req;

	return ac;
}

/* FIXME: too many semi-async searches here for my taste, direct and indirect as
 * cli_credentials_set_secrets() performs a sync ldb search.
 * Just hope we are lucky and nothing breaks (using the tdb backend masks a lot
 * of async issues). -SSS
 */
static int add_modified(struct ldb_module *module, struct ldb_dn *dn, bool do_delete,
			struct ldb_request *parent)
{
	struct ldb_context *ldb = ldb_module_get_ctx(module);
	struct secrets_tdb_sync_private *data = talloc_get_type(ldb_module_get_private(module), struct secrets_tdb_sync_private);
	struct dn_list *item;
	char *filter;
	struct ldb_result *res;
	int ret;

	filter = talloc_asprintf(data,
				 "(&(objectClass=primaryDomain)(flatname=*))");
	if (!filter) {
		return ldb_oom(ldb);
	}

	ret = dsdb_module_search(module, data, &res,
				 dn, LDB_SCOPE_BASE, NULL,
				 DSDB_FLAG_NEXT_MODULE, parent,
				 "%s", filter);
	talloc_free(filter);
	if (ret != LDB_SUCCESS) {
		return ret;
	}

	if (res->count != 1) {
		/* if it's not a primaryDomain then we don't have anything to update */
		talloc_free(res);
		return LDB_SUCCESS;
	}

	item = talloc(data->changed_dns? (void *)data->changed_dns: (void *)data, struct dn_list);
	if (!item) {
		talloc_free(res);
		return ldb_oom(ldb);
	}

	item->msg = talloc_steal(item, res->msgs[0]);
	item->do_delete = do_delete;
	talloc_free(res);

	DLIST_ADD_END(data->changed_dns, item, struct dn_list *);
	return LDB_SUCCESS;
}

static int ust_search_modified(struct secrets_tdb_sync_ctx *ac);

static int secrets_tdb_sync_op_callback(struct ldb_request *req,
				 struct ldb_reply *ares)
{
	struct ldb_context *ldb;
	struct secrets_tdb_sync_ctx *ac;
	int ret;

	ac = talloc_get_type(req->context, struct secrets_tdb_sync_ctx);
	ldb = ldb_module_get_ctx(ac->module);

	if (!ares) {
		return ldb_module_done(ac->req, NULL, NULL,
					LDB_ERR_OPERATIONS_ERROR);
	}
	if (ares->error != LDB_SUCCESS) {
		return ldb_module_done(ac->req, ares->controls,
					ares->response, ares->error);
	}

	if (ares->type != LDB_REPLY_DONE) {
		ldb_set_errstring(ldb, "Invalid request type!\n");
		return ldb_module_done(ac->req, NULL, NULL,
					LDB_ERR_OPERATIONS_ERROR);
	}

	if (ac->do_delete) {
		return ldb_module_done(ac->req, ares->controls,
					ares->response, LDB_SUCCESS);
	}

	ac->op_reply = talloc_steal(ac, ares);

	ret = ust_search_modified(ac);
	if (ret != LDB_SUCCESS) {
		return ldb_module_done(ac->req, NULL, NULL, ret);
	}

	return LDB_SUCCESS;
}

static int ust_del_op(struct secrets_tdb_sync_ctx *ac)
{
	struct ldb_context *ldb;
	struct ldb_request *down_req;
	int ret;

	ldb = ldb_module_get_ctx(ac->module);

	ret = ldb_build_del_req(&down_req, ldb, ac,
				ac->dn,
				ac->req->controls,
				ac, secrets_tdb_sync_op_callback,
				ac->req);
	LDB_REQ_SET_LOCATION(down_req);
	if (ret != LDB_SUCCESS) {
		return ret;
	}
	return ldb_next_request(ac->module, down_req);
}

static int ust_search_modified_callback(struct ldb_request *req,
					struct ldb_reply *ares)
{
	struct secrets_tdb_sync_ctx *ac;
	int ret;

	ac = talloc_get_type(req->context, struct secrets_tdb_sync_ctx);

	if (!ares) {
		return ldb_module_done(ac->req, NULL, NULL,
					LDB_ERR_OPERATIONS_ERROR);
	}
	if (ares->error != LDB_SUCCESS) {
		return ldb_module_done(ac->req, ares->controls,
					ares->response, ares->error);
	}

	switch (ares->type) {
	case LDB_REPLY_ENTRY:

		ac->found = true;
		break;

	case LDB_REPLY_REFERRAL:
		/* ignore */
		break;

	case LDB_REPLY_DONE:

		if (ac->found) {
			/* do the dirty sync job here :/ */
			ret = add_modified(ac->module, ac->dn, ac->do_delete, ac->req);
		}

		if (ac->do_delete) {
			ret = ust_del_op(ac);
			if (ret != LDB_SUCCESS) {
				return ldb_module_done(ac->req,
							NULL, NULL, ret);
			}
			break;
		}

		return ldb_module_done(ac->req, ac->op_reply->controls,
					ac->op_reply->response, LDB_SUCCESS);
	}

	talloc_free(ares);
	return LDB_SUCCESS;
}

static int ust_search_modified(struct secrets_tdb_sync_ctx *ac)
{
	struct ldb_context *ldb;
	static const char * const no_attrs[] = { NULL };
	struct ldb_request *search_req;
	int ret;

	ldb = ldb_module_get_ctx(ac->module);

	ret = ldb_build_search_req(&search_req, ldb, ac,
				   ac->dn, LDB_SCOPE_BASE,
				   "(&(objectClass=kerberosSecret)"
				     "(privateKeytab=*))", no_attrs,
				   NULL,
				   ac, ust_search_modified_callback,
				   ac->req);
	LDB_REQ_SET_LOCATION(search_req);
	if (ret != LDB_SUCCESS) {
		return ret;
	}
	return ldb_next_request(ac->module, search_req);
}


/* add */
static int secrets_tdb_sync_add(struct ldb_module *module, struct ldb_request *req)
{
	struct ldb_context *ldb;
	struct secrets_tdb_sync_ctx *ac;
	struct ldb_request *down_req;
	int ret;

	ldb = ldb_module_get_ctx(module);

	ac = secrets_tdb_sync_ctx_init(module, req);
	if (ac == NULL) {
		return ldb_operr(ldb);
	}

	ac->dn = req->op.add.message->dn;

	ret = ldb_build_add_req(&down_req, ldb, ac,
				req->op.add.message,
				req->controls,
				ac, secrets_tdb_sync_op_callback,
				req);
	LDB_REQ_SET_LOCATION(down_req);
	if (ret != LDB_SUCCESS) {
		return ret;
	}

	return ldb_next_request(module, down_req);
}

/* modify */
static int secrets_tdb_sync_modify(struct ldb_module *module, struct ldb_request *req)
{
	struct ldb_context *ldb;
	struct secrets_tdb_sync_ctx *ac;
	struct ldb_request *down_req;
	int ret;

	ldb = ldb_module_get_ctx(module);

	ac = secrets_tdb_sync_ctx_init(module, req);
	if (ac == NULL) {
		return ldb_operr(ldb);
	}

	ac->dn = req->op.mod.message->dn;

	ret = ldb_build_mod_req(&down_req, ldb, ac,
				req->op.mod.message,
				req->controls,
				ac, secrets_tdb_sync_op_callback,
				req);
	LDB_REQ_SET_LOCATION(down_req);
	if (ret != LDB_SUCCESS) {
		return ret;
	}

	return ldb_next_request(module, down_req);
}

/* delete */
static int secrets_tdb_sync_delete(struct ldb_module *module, struct ldb_request *req)
{
	struct secrets_tdb_sync_ctx *ac;

	ac = secrets_tdb_sync_ctx_init(module, req);
	if (ac == NULL) {
		return ldb_operr(ldb_module_get_ctx(module));
	}

	ac->dn = req->op.del.dn;
	ac->do_delete = true;

	return ust_search_modified(ac);
}

/* rename */
static int secrets_tdb_sync_rename(struct ldb_module *module, struct ldb_request *req)
{
	struct ldb_context *ldb;
	struct secrets_tdb_sync_ctx *ac;
	struct ldb_request *down_req;
	int ret;

	ldb = ldb_module_get_ctx(module);

	ac = secrets_tdb_sync_ctx_init(module, req);
	if (ac == NULL) {
		return ldb_operr(ldb);
	}

	ac->dn = req->op.rename.newdn;

	ret = ldb_build_rename_req(&down_req, ldb, ac,
				req->op.rename.olddn,
				req->op.rename.newdn,
				req->controls,
				ac, secrets_tdb_sync_op_callback,
				req);
	LDB_REQ_SET_LOCATION(down_req);
	if (ret != LDB_SUCCESS) {
		return ret;
	}

	return ldb_next_request(module, down_req);
}

/* prepare for a commit */
static int secrets_tdb_sync_prepare_commit(struct ldb_module *module)
{
	struct ldb_context *ldb = ldb_module_get_ctx(module);
	struct secrets_tdb_sync_private *data = talloc_get_type(ldb_module_get_private(module),
								struct secrets_tdb_sync_private);
	struct dn_list *p;
	TALLOC_CTX *tmp_ctx;

	tmp_ctx = talloc_new(data);
	if (!tmp_ctx) {
		ldb_oom(ldb);
		goto fail;
	}

	for (p=data->changed_dns; p; p = p->next) {
		const struct ldb_val *whenChanged = ldb_msg_find_ldb_val(p->msg, "whenChanged");
		time_t lct = 0;
		bool ret;

		if (whenChanged) {
			ldb_val_to_time(whenChanged, &lct);
		}

		ret = secrets_store_machine_pw_sync(ldb_msg_find_attr_as_string(p->msg, "secret", NULL),
						    ldb_msg_find_attr_as_string(p->msg, "priorSecret", NULL),

						    ldb_msg_find_attr_as_string(p->msg, "flatname", NULL),
						    ldb_msg_find_attr_as_string(p->msg, "realm", NULL),
						    ldb_msg_find_attr_as_string(p->msg, "saltPrincipal", NULL),
						    (uint32_t)ldb_msg_find_attr_as_int(p->msg, "msDS-SupportedEncryptionTypes", ENC_ALL_TYPES),
						    samdb_result_dom_sid(tmp_ctx, p->msg, "objectSid"),

						    lct,
						    p->do_delete);
		if (ret == false) {
			ldb_asprintf_errstring(ldb, "Failed to update secrets.tdb from entry %s in %s",
					       ldb_dn_get_linearized(p->msg->dn),
					       (const char *)ldb_get_opaque(ldb, "ldb_url"));
			goto fail;
		}
	}

	talloc_free(data->changed_dns);
	data->changed_dns = NULL;
	talloc_free(tmp_ctx);

	return ldb_next_prepare_commit(module);

fail:
	dbwrap_transaction_cancel(data->secrets_tdb);
	talloc_free(data->changed_dns);
	data->changed_dns = NULL;
	talloc_free(tmp_ctx);
	return LDB_ERR_OPERATIONS_ERROR;
}

/* start a transaction */
static int secrets_tdb_sync_start_transaction(struct ldb_module *module)
{
	struct secrets_tdb_sync_private *data = talloc_get_type(ldb_module_get_private(module), struct secrets_tdb_sync_private);

	if (dbwrap_transaction_start(data->secrets_tdb) != 0) {
		return ldb_module_operr(module);
	}

	return ldb_next_start_trans(module);
}

/* end a transaction */
static int secrets_tdb_sync_end_transaction(struct ldb_module *module)
{
	struct secrets_tdb_sync_private *data = talloc_get_type(ldb_module_get_private(module), struct secrets_tdb_sync_private);

	if (dbwrap_transaction_commit(data->secrets_tdb) != 0) {
		return ldb_module_operr(module);
	}

	return ldb_next_end_trans(module);
}

/* abandon a transaction */
static int secrets_tdb_sync_del_transaction(struct ldb_module *module)
{
	struct secrets_tdb_sync_private *data = talloc_get_type(ldb_module_get_private(module), struct secrets_tdb_sync_private);

	talloc_free(data->changed_dns);
	data->changed_dns = NULL;
	if (dbwrap_transaction_cancel(data->secrets_tdb) != 0) {
		return ldb_module_operr(module);
	}

	return ldb_next_del_trans(module);
}

static int secrets_tdb_sync_init(struct ldb_module *module)
{
	struct ldb_context *ldb;
	struct secrets_tdb_sync_private *data;
	char *private_dir, *p;
	const char *secrets_ldb;

	ldb = ldb_module_get_ctx(module);

	data = talloc(module, struct secrets_tdb_sync_private);
	if (data == NULL) {
		return ldb_oom(ldb);
	}

	data->changed_dns = NULL;

	ldb_module_set_private(module, data);

	secrets_ldb = (const char *)ldb_get_opaque(ldb, "ldb_url");
	if (strncmp("tdb://", secrets_ldb, 6) == 0) {
		secrets_ldb += 6;
	}
	if (!secrets_ldb) {
		return ldb_operr(ldb);
	}
	private_dir = talloc_strdup(data, secrets_ldb);
	p = strrchr(private_dir, '/');
	if (p) {
		*p = '\0';
		secrets_init_path(private_dir);
	} else {
		secrets_init_path(".");
	}

	TALLOC_FREE(private_dir);

	data->secrets_tdb = secrets_db_ctx();

	return ldb_next_init(module);
}

static const struct ldb_module_ops ldb_secrets_tdb_sync_module_ops = {
	.name		   = "secrets_tdb_sync",
	.init_context	   = secrets_tdb_sync_init,
	.add               = secrets_tdb_sync_add,
	.modify            = secrets_tdb_sync_modify,
	.rename            = secrets_tdb_sync_rename,
	.del               = secrets_tdb_sync_delete,
	.start_transaction = secrets_tdb_sync_start_transaction,
	.prepare_commit    = secrets_tdb_sync_prepare_commit,
	.end_transaction   = secrets_tdb_sync_end_transaction,
	.del_transaction   = secrets_tdb_sync_del_transaction,
};

int ldb_secrets_tdb_sync_module_init(const char *version)
{
	LDB_MODULE_CHECK_VERSION(version);
	return ldb_register_module(&ldb_secrets_tdb_sync_module_ops);
}