summaryrefslogtreecommitdiff
path: root/source4/dsdb/kcc/kcc_periodic.c
blob: 2654f9f2d9adfbe93d9fe1ddb9302b36fb64a767 (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
/* 
   Unix SMB/CIFS mplementation.
   KCC service periodic handling
   
   Copyright (C) Andrew Tridgell 2009
   based on repl service code
    
   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 "lib/events/events.h"
#include "dsdb/samdb/samdb.h"
#include "auth/auth.h"
#include "smbd/service.h"
#include "lib/messaging/irpc.h"
#include "dsdb/kcc/kcc_connection.h"
#include "dsdb/kcc/kcc_service.h"
#include <ldb_errors.h>
#include "../lib/util/dlinklist.h"
#include "librpc/gen_ndr/ndr_misc.h"
#include "librpc/gen_ndr/ndr_drsuapi.h"
#include "librpc/gen_ndr/ndr_drsblobs.h"
#include "librpc/gen_ndr/ndr_irpc_c.h"
#include "param/param.h"

/*
 * see if two repsFromToBlob blobs are for the same source DSA
 */
static bool kccsrv_same_source_dsa(struct repsFromToBlob *r1, struct repsFromToBlob *r2)
{
	return GUID_compare(&r1->ctr.ctr1.source_dsa_obj_guid,
			    &r2->ctr.ctr1.source_dsa_obj_guid) == 0;
}

/*
 * see if a repsFromToBlob is in a list
 */
static bool reps_in_list(struct repsFromToBlob *r, struct repsFromToBlob *reps, uint32_t count)
{
	uint32_t i;
	for (i=0; i<count; i++) {
		if (kccsrv_same_source_dsa(r, &reps[i])) {
			return true;
		}
	}
	return false;
}

/*
  make sure we only add repsFrom entries for DCs who are masters for
  the partition
 */
static bool check_MasterNC(struct kccsrv_partition *p, struct repsFromToBlob *r,
			   struct ldb_result *res)
{
	struct repsFromTo1 *r1 = &r->ctr.ctr1;
	struct GUID invocation_id = r1->source_dsa_invocation_id;
	unsigned int i, j;

	/* we are expecting only version 1 */
	SMB_ASSERT(r->version == 1);

	for (i=0; i<res->count; i++) {
		struct ldb_message *msg = res->msgs[i];
		struct ldb_message_element *el;
		struct ldb_dn *dn;

		struct GUID id2 = samdb_result_guid(msg, "invocationID");
		if (GUID_all_zero(&id2) ||
		    !GUID_equal(&invocation_id, &id2)) {
			continue;
		}

		el = ldb_msg_find_element(msg, "msDS-hasMasterNCs");
		if (!el || el->num_values == 0) {
			el = ldb_msg_find_element(msg, "hasMasterNCs");
			if (!el || el->num_values == 0) {
				continue;
			}
		}
		for (j=0; j<el->num_values; j++) {
			dn = ldb_dn_from_ldb_val(p, p->service->samdb, &el->values[j]);
			if (!ldb_dn_validate(dn)) {
				talloc_free(dn);
				continue;
			}
			if (ldb_dn_compare(dn, p->dn) == 0) {
				talloc_free(dn);
				DEBUG(5,("%s %s match on %s in %s\n",
					 r1->other_info->dns_name,
					 el->name,
					 ldb_dn_get_linearized(dn),
					 ldb_dn_get_linearized(msg->dn)));
				return true;
			}
			talloc_free(dn);
		}
	}
	return false;
}

struct kccsrv_notify_drepl_server_state {
	struct dreplsrv_refresh r;
};

static void kccsrv_notify_drepl_server_done(struct tevent_req *subreq);

/**
 * Force dreplsrv to update its state as topology is changed
 */
static void kccsrv_notify_drepl_server(struct kccsrv_service *s,
				       TALLOC_CTX *mem_ctx)
{
	struct kccsrv_notify_drepl_server_state *state;
	struct dcerpc_binding_handle *irpc_handle;
	struct tevent_req *subreq;

	state = talloc_zero(s, struct kccsrv_notify_drepl_server_state);
	if (state == NULL) {
		return;
	}

	irpc_handle = irpc_binding_handle_by_name(state, s->task->msg_ctx,
						  "dreplsrv", &ndr_table_irpc);
	if (irpc_handle == NULL) {
		/* dreplsrv is not running yet */
		TALLOC_FREE(state);
		return;
	}

	subreq = dcerpc_dreplsrv_refresh_r_send(state, s->task->event_ctx,
						irpc_handle, &state->r);
	if (subreq == NULL) {
		TALLOC_FREE(state);
		return;
	}
	tevent_req_set_callback(subreq, kccsrv_notify_drepl_server_done, state);
}

static void kccsrv_notify_drepl_server_done(struct tevent_req *subreq)
{
	struct kccsrv_notify_drepl_server_state *state =
		tevent_req_callback_data(subreq,
		struct kccsrv_notify_drepl_server_state);
	NTSTATUS status;

	status = dcerpc_dreplsrv_refresh_r_recv(subreq, state);
	TALLOC_FREE(subreq);

	/* we don't care about errors */
	TALLOC_FREE(state);
}

uint32_t kccsrv_replica_flags(struct kccsrv_service *s)
{
	if (s->am_rodc) {
		return DRSUAPI_DRS_INIT_SYNC |
			DRSUAPI_DRS_PER_SYNC |
			DRSUAPI_DRS_ADD_REF |
			DRSUAPI_DRS_SPECIAL_SECRET_PROCESSING |
			DRSUAPI_DRS_GET_ALL_GROUP_MEMBERSHIP |
			DRSUAPI_DRS_NONGC_RO_REP;
	}
	return DRSUAPI_DRS_INIT_SYNC |
		DRSUAPI_DRS_PER_SYNC |
		DRSUAPI_DRS_ADD_REF |
		DRSUAPI_DRS_WRIT_REP;
}

/*
 * add any missing repsFrom structures to our partitions
 */
NTSTATUS kccsrv_add_repsFrom(struct kccsrv_service *s, TALLOC_CTX *mem_ctx,
			    struct repsFromToBlob *reps, uint32_t count,
			    struct ldb_result *res)
{
	struct kccsrv_partition *p;
	bool notify_dreplsrv = false;
	uint32_t replica_flags = kccsrv_replica_flags(s);

	/* update the repsFrom on all partitions */
	for (p=s->partitions; p; p=p->next) {
		struct repsFromToBlob *our_reps;
		uint32_t our_count;
		WERROR werr;
		uint32_t i, j;
		bool modified = false;

		werr = dsdb_loadreps(s->samdb, mem_ctx, p->dn, "repsFrom", &our_reps, &our_count);
		if (!W_ERROR_IS_OK(werr)) {
			DEBUG(0,(__location__ ": Failed to load repsFrom from %s - %s\n", 
				 ldb_dn_get_linearized(p->dn), ldb_errstring(s->samdb)));
			return NT_STATUS_INTERNAL_DB_CORRUPTION;
		}

		/* see if the entry already exists */
		for (i=0; i<count; i++) {
			for (j=0; j<our_count; j++) {
				if (kccsrv_same_source_dsa(&reps[i], &our_reps[j])) {
					/* we already have this one -
					   check the replica_flags are right */
					if (replica_flags != our_reps[j].ctr.ctr1.replica_flags) {
						/* we need to update the old one with
						 * the new flags
						 */
						our_reps[j].ctr.ctr1.replica_flags = replica_flags;
						modified = true;
					}
					break;
				}
			}
			if (j == our_count) {
				/* we don't have the new one - add it
				 * if it is a master
				 */
				if (res && !check_MasterNC(p, &reps[i], res)) {
					/* its not a master, we don't
					   want to pull from it */
					continue;
				}
				/* we need to add it to our repsFrom */
				our_reps = talloc_realloc(mem_ctx, our_reps, struct repsFromToBlob, our_count+1);
				NT_STATUS_HAVE_NO_MEMORY(our_reps);
				our_reps[our_count] = reps[i];
				our_reps[our_count].ctr.ctr1.replica_flags = replica_flags;
				our_count++;
				modified = true;
				DEBUG(4,(__location__ ": Added repsFrom for %s\n",
					 reps[i].ctr.ctr1.other_info->dns_name));
			}
		}

		/* remove any stale ones */
		for (i=0; i<our_count; i++) {
			if (!reps_in_list(&our_reps[i], reps, count) ||
			    (res && !check_MasterNC(p, &our_reps[i], res))) {
				DEBUG(4,(__location__ ": Removed repsFrom for %s\n",
					 our_reps[i].ctr.ctr1.other_info->dns_name));
				memmove(&our_reps[i], &our_reps[i+1], (our_count-(i+1))*sizeof(our_reps[0]));
				our_count--;
				i--;
				modified = true;
			}
		}

		if (modified) {
			werr = dsdb_savereps(s->samdb, mem_ctx, p->dn, "repsFrom", our_reps, our_count);
			if (!W_ERROR_IS_OK(werr)) {
				DEBUG(0,(__location__ ": Failed to save repsFrom to %s - %s\n", 
					 ldb_dn_get_linearized(p->dn), ldb_errstring(s->samdb)));
				return NT_STATUS_INTERNAL_DB_CORRUPTION;
			}
			/* dreplsrv should refresh its state */
			notify_dreplsrv = true;
		}

		/* remove stale repsTo entries */
		modified = false;
		werr = dsdb_loadreps(s->samdb, mem_ctx, p->dn, "repsTo", &our_reps, &our_count);
		if (!W_ERROR_IS_OK(werr)) {
			DEBUG(0,(__location__ ": Failed to load repsTo from %s - %s\n", 
				 ldb_dn_get_linearized(p->dn), ldb_errstring(s->samdb)));
			return NT_STATUS_INTERNAL_DB_CORRUPTION;
		}

		/* remove any stale ones */
		for (i=0; i<our_count; i++) {
			if (!reps_in_list(&our_reps[i], reps, count)) {
				DEBUG(4,(__location__ ": Removed repsTo for %s\n",
					 our_reps[i].ctr.ctr1.other_info->dns_name));
				memmove(&our_reps[i], &our_reps[i+1], (our_count-(i+1))*sizeof(our_reps[0]));
				our_count--;
				i--;
				modified = true;
			}
		}

		if (modified) {
			werr = dsdb_savereps(s->samdb, mem_ctx, p->dn, "repsTo", our_reps, our_count);
			if (!W_ERROR_IS_OK(werr)) {
				DEBUG(0,(__location__ ": Failed to save repsTo to %s - %s\n", 
					 ldb_dn_get_linearized(p->dn), ldb_errstring(s->samdb)));
				return NT_STATUS_INTERNAL_DB_CORRUPTION;
			}
			/* dreplsrv should refresh its state */
			notify_dreplsrv = true;
		}
	}

	/* notify dreplsrv toplogy has changed */
	if (notify_dreplsrv) {
		kccsrv_notify_drepl_server(s, mem_ctx);
	}

	return NT_STATUS_OK;

}

/*
  this is the core of our initial simple KCC
  We just add a repsFrom entry for all DCs we find that have nTDSDSA
  objects, except for ourselves
 */
NTSTATUS kccsrv_simple_update(struct kccsrv_service *s, TALLOC_CTX *mem_ctx)
{
	struct ldb_result *res;
	unsigned int i;
	int ret;
	const char *attrs[] = { "objectGUID", "invocationID", "msDS-hasMasterNCs", "hasMasterNCs", NULL };
	struct repsFromToBlob *reps = NULL;
	uint32_t count = 0;
	struct kcc_connection_list *ntds_conn, *dsa_conn;

	ret = ldb_search(s->samdb, mem_ctx, &res, s->config_dn, LDB_SCOPE_SUBTREE, 
			 attrs, "objectClass=nTDSDSA");
	if (ret != LDB_SUCCESS) {
		DEBUG(0,(__location__ ": Failed nTDSDSA search - %s\n", ldb_errstring(s->samdb)));
		return NT_STATUS_INTERNAL_DB_CORRUPTION;
	}

	/* get the current list of connections */
	ntds_conn = kccsrv_find_connections(s, mem_ctx);

	dsa_conn = talloc_zero(mem_ctx, struct kcc_connection_list);

	for (i=0; i<res->count; i++) {
		struct repsFromTo1 *r1;
		struct GUID ntds_guid, invocation_id;

		ntds_guid = samdb_result_guid(res->msgs[i], "objectGUID");
		if (GUID_compare(&ntds_guid, &s->ntds_guid) == 0) {
			/* don't replicate with ourselves */
			continue;
		}

		invocation_id = samdb_result_guid(res->msgs[i], "invocationID");

		reps = talloc_realloc(mem_ctx, reps, struct repsFromToBlob, count+1);
		NT_STATUS_HAVE_NO_MEMORY(reps);

		ZERO_STRUCT(reps[count]);
		reps[count].version = 1;
		r1 = &reps[count].ctr.ctr1;

		r1->other_info               = talloc_zero(reps, struct repsFromTo1OtherInfo);
		r1->other_info->dns_name     = samdb_ntds_msdcs_dns_name(s->samdb, reps, &ntds_guid);
		r1->source_dsa_obj_guid      = ntds_guid;
		r1->source_dsa_invocation_id = invocation_id;
		r1->replica_flags = kccsrv_replica_flags(s);
		memset(r1->schedule, 0x11, sizeof(r1->schedule));

		dsa_conn->servers = talloc_realloc(dsa_conn, dsa_conn->servers,
						  struct kcc_connection,
						  dsa_conn->count + 1);
		NT_STATUS_HAVE_NO_MEMORY(dsa_conn->servers);
		dsa_conn->servers[dsa_conn->count].dsa_guid = r1->source_dsa_obj_guid;
		dsa_conn->count++;

		count++;
	}

	kccsrv_apply_connections(s, ntds_conn, dsa_conn);

	return kccsrv_add_repsFrom(s, mem_ctx, reps, count, res);
}


static void kccsrv_periodic_run(struct kccsrv_service *service);

static void kccsrv_periodic_handler_te(struct tevent_context *ev, struct tevent_timer *te,
					 struct timeval t, void *ptr)
{
	struct kccsrv_service *service = talloc_get_type(ptr, struct kccsrv_service);
	WERROR status;

	service->periodic.te = NULL;

	kccsrv_periodic_run(service);

	status = kccsrv_periodic_schedule(service, service->periodic.interval);
	if (!W_ERROR_IS_OK(status)) {
		task_server_terminate(service->task, win_errstr(status), true);
		return;
	}
}

WERROR kccsrv_periodic_schedule(struct kccsrv_service *service, uint32_t next_interval)
{
	TALLOC_CTX *tmp_mem;
	struct tevent_timer *new_te;
	struct timeval next_time;

	/* prevent looping */
	if (next_interval == 0) next_interval = 1;

	next_time = timeval_current_ofs(next_interval, 50);

	if (service->periodic.te) {
		/*
		 * if the timestamp of the new event is higher,
		 * as current next we don't need to reschedule
		 */
		if (timeval_compare(&next_time, &service->periodic.next_event) > 0) {
			return WERR_OK;
		}
	}

	/* reset the next scheduled timestamp */
	service->periodic.next_event = next_time;

	new_te = tevent_add_timer(service->task->event_ctx, service,
			         service->periodic.next_event,
			         kccsrv_periodic_handler_te, service);
	W_ERROR_HAVE_NO_MEMORY(new_te);

	tmp_mem = talloc_new(service);
	DEBUG(4,("kccsrv_periodic_schedule(%u) %sscheduled for: %s\n",
		next_interval,
		(service->periodic.te?"re":""),
		nt_time_string(tmp_mem, timeval_to_nttime(&next_time))));
	talloc_free(tmp_mem);

	talloc_free(service->periodic.te);
	service->periodic.te = new_te;

	return WERR_OK;
}

static void kccsrv_periodic_run(struct kccsrv_service *service)
{
	TALLOC_CTX *mem_ctx;
	NTSTATUS status;

	DEBUG(4,("kccsrv_periodic_run(): simple update\n"));

	mem_ctx = talloc_new(service);
	status = kccsrv_simple_update(service, mem_ctx);
	if (!NT_STATUS_IS_OK(status)) {
		DEBUG(0,("kccsrv_simple_update failed - %s\n", nt_errstr(status)));
	}

	status = kccsrv_check_deleted(service, mem_ctx);
	if (!NT_STATUS_IS_OK(status)) {
		DEBUG(0,("kccsrv_check_deleted failed - %s\n", nt_errstr(status)));
	}
	talloc_free(mem_ctx);
}