summaryrefslogtreecommitdiff
path: root/source3/nmbd/nmbd_processlogon.c
blob: 4dedb5fa5f706230c5cde1eb1ffa664034ff9c9f (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
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
/*
   Unix SMB/CIFS implementation.
   NBT netbios routines and daemon - version 2
   Copyright (C) Andrew Tridgell 1994-1998
   Copyright (C) Luke Kenneth Casson Leighton 1994-1998
   Copyright (C) Jeremy Allison 1994-2003
   Copyright (C) Jim McDonough <jmcd@us.ibm.com> 2002

   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/>.

   Revision History:

*/

#include "includes.h"
#include "../libcli/netlogon/netlogon.h"
#include "../libcli/cldap/cldap.h"
#include "../lib/tsocket/tsocket.h"
#include "../libcli/security/security.h"
#include "secrets.h"
#include "nmbd/nmbd.h"

struct sam_database_info {
        uint32 index;
        uint32 serial_lo, serial_hi;
        uint32 date_lo, date_hi;
};

/**
 * check whether the client belongs to the hosts
 * for which initial logon should be delayed...
 */
static bool delay_logon(const char *peer_name, const char *peer_addr)
{
	const char **delay_list = lp_init_logon_delayed_hosts();
	const char *peer[2];

	if (delay_list == NULL) {
		return False;
	}

	peer[0] = peer_name;
	peer[1] = peer_addr;

	return list_match(delay_list, (const char *)peer, client_match);
}

static void delayed_init_logon_handler(struct tevent_context *event_ctx,
				       struct timed_event *te,
				       struct timeval now,
				       void *private_data)
{
	struct packet_struct *p = (struct packet_struct *)private_data;

	DEBUG(10, ("delayed_init_logon_handler (%lx): re-queuing packet.\n",
		   (unsigned long)te));

	queue_packet(p);

	TALLOC_FREE(te);
}

struct nmbd_proxy_logon_context {
	struct cldap_socket *cldap_sock;
};

static struct nmbd_proxy_logon_context *global_nmbd_proxy_logon;

bool initialize_nmbd_proxy_logon(void)
{
	const char *cldap_server = lp_parm_const_string(-1, "nmbd_proxy_logon",
						        "cldap_server", NULL);
	struct nmbd_proxy_logon_context *ctx;
	NTSTATUS status;
	struct in_addr addr;
	char addrstr[INET_ADDRSTRLEN];
	const char *server_str;
	int ret;
	struct tsocket_address *server_addr;

	if (!cldap_server) {
		return true;
	}

	addr = interpret_addr2(cldap_server);
	server_str = inet_ntop(AF_INET, &addr,
			     addrstr, sizeof(addrstr));
	if (!server_str || strcmp("0.0.0.0", server_str) == 0) {
		DEBUG(0,("Failed to resolve[%s] for nmbd_proxy_logon\n",
			 cldap_server));
		return false;
	}

	ctx = talloc_zero(nmbd_event_context(),
			  struct nmbd_proxy_logon_context);
	if (!ctx) {
		return false;
	}

	ret = tsocket_address_inet_from_strings(ctx, "ipv4",
						server_str, LDAP_PORT,
						&server_addr);
	if (ret != 0) {
		TALLOC_FREE(ctx);
		status = map_nt_error_from_unix(errno);
		DEBUG(0,("Failed to create cldap tsocket_address for %s - %s\n",
			 server_str, nt_errstr(status)));
		return false;
	}

	/* we create a connected udp socket */
	status = cldap_socket_init(ctx, NULL, server_addr, &ctx->cldap_sock);
	TALLOC_FREE(server_addr);
	if (!NT_STATUS_IS_OK(status)) {
		TALLOC_FREE(ctx);
		DEBUG(0,("failed to create cldap socket for %s: %s\n",
			server_str, nt_errstr(status)));
		return false;
	}

	global_nmbd_proxy_logon = ctx;
	return true;
}

struct nmbd_proxy_logon_state {
	struct in_addr local_ip;
	struct packet_struct *p;
	const char *remote_name;
	uint8_t remote_name_type;
	const char *remote_mailslot;
	struct nbt_netlogon_packet req;
	struct nbt_netlogon_response resp;
	struct cldap_netlogon io;
};

static int nmbd_proxy_logon_state_destructor(struct nmbd_proxy_logon_state *s)
{
	s->p->locked = false;
	free_packet(s->p);
	return 0;
}

static void nmbd_proxy_logon_done(struct tevent_req *subreq);

static void nmbd_proxy_logon(struct nmbd_proxy_logon_context *ctx,
			     struct in_addr local_ip,
			     struct packet_struct *p,
			     const uint8_t *buf,
			     uint32_t len)
{
	struct nmbd_proxy_logon_state *state;
	enum ndr_err_code ndr_err;
	DATA_BLOB blob = data_blob_const(buf, len);
	const char *computer_name = NULL;
	const char *mailslot_name = NULL;
	const char *user_name = NULL;
	const char *domain_sid = NULL;
	uint32_t acct_control = 0;
	uint32_t nt_version = 0;
	struct tevent_req *subreq;
	fstring source_name;
	struct dgram_packet *dgram = &p->packet.dgram;

	state = talloc_zero(ctx, struct nmbd_proxy_logon_state);
	if (!state) {
		DEBUG(0,("failed to allocate nmbd_proxy_logon_state\n"));
		return;
	}

	pull_ascii_nstring(source_name, sizeof(source_name), dgram->source_name.name);
	state->remote_name = talloc_strdup(state, source_name);
	state->remote_name_type = dgram->source_name.name_type,
	state->local_ip = local_ip;
	state->p = p;

	ndr_err = ndr_pull_struct_blob(
		&blob, state, &state->req,
		(ndr_pull_flags_fn_t)ndr_pull_nbt_netlogon_packet);
	if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
		NTSTATUS status = ndr_map_error2ntstatus(ndr_err);
		DEBUG(0,("failed parse nbt_netlogon_packet: %s\n",
			nt_errstr(status)));
		TALLOC_FREE(state);
		return;
	}

	if (DEBUGLEVEL >= 10) {
		DEBUG(10, ("nmbd_proxy_logon:\n"));
		NDR_PRINT_DEBUG(nbt_netlogon_packet, &state->req);
	}

	switch (state->req.command) {
	case LOGON_SAM_LOGON_REQUEST:
		computer_name	= state->req.req.logon.computer_name;
		user_name	= state->req.req.logon.user_name;
		mailslot_name	= state->req.req.logon.mailslot_name;
		acct_control	= state->req.req.logon.acct_control;
		if (state->req.req.logon.sid_size > 0) {
			domain_sid = dom_sid_string(state,
						    &state->req.req.logon.sid);
			if (!domain_sid) {
				DEBUG(0,("failed to get a string for sid\n"));
				TALLOC_FREE(state);
				return;
			}
		}
		nt_version	= state->req.req.logon.nt_version;
		break;

	default:
		/* this can't happen as the caller already checks the command */
		break;
	}

	state->remote_mailslot = mailslot_name;

	if (user_name && strlen(user_name) == 0) {
		user_name = NULL;
	}

	if (computer_name && strlen(computer_name) == 0) {
		computer_name = NULL;
	}

	/*
	 * as the socket is connected,
	 * we don't need to specify the destination
	 */
	state->io.in.dest_address	= NULL;
	state->io.in.dest_port		= 0;
	state->io.in.realm		= NULL;
	state->io.in.host		= computer_name;
	state->io.in.user		= user_name;
	state->io.in.domain_guid	= NULL;
	state->io.in.domain_sid		= domain_sid;
	state->io.in.acct_control	= acct_control;
	state->io.in.version		= nt_version;
	state->io.in.map_response	= false;

	subreq = cldap_netlogon_send(state, nmbd_event_context(),
				     ctx->cldap_sock,
				     &state->io);
	if (!subreq) {
		DEBUG(0,("failed to send cldap netlogon call\n"));
		TALLOC_FREE(state);
		return;
	}
	tevent_req_set_callback(subreq, nmbd_proxy_logon_done, state);

	/* we reply async */
	state->p->locked = true;
	talloc_set_destructor(state, nmbd_proxy_logon_state_destructor);
}

static void nmbd_proxy_logon_done(struct tevent_req *subreq)
{
	struct nmbd_proxy_logon_state *state =
		tevent_req_callback_data(subreq,
		struct nmbd_proxy_logon_state);
	NTSTATUS status;
	DATA_BLOB response = data_blob_null;

	status = cldap_netlogon_recv(subreq, state, &state->io);
	if (!NT_STATUS_IS_OK(status)) {
		DEBUG(0,("failed to recv cldap netlogon call: %s\n",
			nt_errstr(status)));
		TALLOC_FREE(state);
		return;
	}

	status = push_netlogon_samlogon_response(&response, state,
						 &state->io.out.netlogon);
	if (!NT_STATUS_IS_OK(status)) {
		DEBUG(0,("failed to push netlogon_samlogon_response: %s\n",
			nt_errstr(status)));
		TALLOC_FREE(state);
		return;
	}

	send_mailslot(true, state->remote_mailslot,
		      (char *)response.data, response.length,
		      lp_netbios_name(), 0x0,
		      state->remote_name,
		      state->remote_name_type,
		      state->p->ip,
		      state->local_ip,
		      state->p->port);
	TALLOC_FREE(state);
}

/****************************************************************************
Process a domain logon packet
**************************************************************************/

void process_logon_packet(struct packet_struct *p, const char *buf,int len,
                          const char *mailslot)
{
	fstring source_name;
	struct dgram_packet *dgram = &p->packet.dgram;
	struct sockaddr_storage ss;
	const struct sockaddr_storage *pss;
	struct in_addr ip;

	DATA_BLOB blob_in, blob_out;
	enum ndr_err_code ndr_err;
	struct nbt_netlogon_packet request;
	struct nbt_netlogon_response response;
	NTSTATUS status;
	const char *pdc_name;

	in_addr_to_sockaddr_storage(&ss, p->ip);
	pss = iface_ip((struct sockaddr *)&ss);
	if (!pss) {
		DEBUG(5,("process_logon_packet:can't find outgoing interface "
			"for packet from IP %s\n",
			inet_ntoa(p->ip) ));
		return;
	}
	ip = ((const struct sockaddr_in *)pss)->sin_addr;

	if (!IS_DC) {
		DEBUG(5,("process_logon_packet: Logon packet received from IP %s and domain \
logons are not enabled.\n", inet_ntoa(p->ip) ));
		return;
	}

	pull_ascii_nstring(source_name, sizeof(source_name), dgram->source_name.name);

	pdc_name = talloc_asprintf(talloc_tos(), "\\\\%s", lp_netbios_name());
	if (!pdc_name) {
		return;
	}

	ZERO_STRUCT(request);

	blob_in = data_blob_const(buf, len);

	ndr_err = ndr_pull_struct_blob(&blob_in, talloc_tos(), &request,
		(ndr_pull_flags_fn_t)ndr_pull_nbt_netlogon_packet);
	if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
		DEBUG(1,("process_logon_packet: Failed to pull logon packet\n"));
		return;
	}

	if (DEBUGLEVEL >= 10) {
		NDR_PRINT_DEBUG(nbt_netlogon_packet, &request);
	}

	DEBUG(4,("process_logon_packet: Logon from %s: code = 0x%x\n",
		inet_ntoa(p->ip), request.command));

	switch (request.command) {
	case LOGON_REQUEST: {

		struct nbt_netlogon_response2 response2;

		DEBUG(5,("process_logon_packet: Domain login request from %s at IP %s user=%s token=%x\n",
			request.req.logon0.computer_name, inet_ntoa(p->ip),
			request.req.logon0.user_name,
			request.req.logon0.lm20_token));

		response2.command	= LOGON_RESPONSE2;
		response2.pdc_name	= pdc_name;
		response2.lm20_token	= 0xffff;

		response.response_type = NETLOGON_RESPONSE2;
		response.data.response2 = response2;

		status = push_nbt_netlogon_response(&blob_out, talloc_tos(), &response);
		if (!NT_STATUS_IS_OK(status)) {
			DEBUG(0,("process_logon_packet: failed to push packet\n"));
			return;
		}

		if (DEBUGLEVEL >= 10) {
			NDR_PRINT_DEBUG(nbt_netlogon_response2, &response.data.response2);
		}

		send_mailslot(True, request.req.logon0.mailslot_name,
				(char *)blob_out.data,
				blob_out.length,
				lp_netbios_name(), 0x0,
				source_name,
				dgram->source_name.name_type,
				p->ip, ip, p->port);
		break;
	}

	case LOGON_PRIMARY_QUERY: {

		struct nbt_netlogon_response_from_pdc get_pdc;

		if (!lp_domain_master()) {
			/* We're not Primary Domain Controller -- ignore this */
			return;
		}

		DEBUG(5,("process_logon_packet: GETDC request from %s at IP %s, "
			"reporting %s domain %s 0x%x ntversion=%x lm_nt token=%x lm_20 token=%x\n",
			request.req.pdc.computer_name,
			inet_ntoa(p->ip),
			lp_netbios_name(),
			lp_workgroup(),
			NETLOGON_RESPONSE_FROM_PDC,
			request.req.pdc.nt_version,
			request.req.pdc.lmnt_token,
			request.req.pdc.lm20_token));

		get_pdc.command			= NETLOGON_RESPONSE_FROM_PDC;
		get_pdc.pdc_name		= lp_netbios_name();
		get_pdc._pad			= data_blob_null;
		get_pdc.unicode_pdc_name	= lp_netbios_name();
		get_pdc.domain_name		= lp_workgroup();
		get_pdc.nt_version		= NETLOGON_NT_VERSION_1;
		get_pdc.lmnt_token		= 0xffff;
		get_pdc.lm20_token		= 0xffff;

		response.response_type = NETLOGON_GET_PDC;
		response.data.get_pdc = get_pdc;

		status = push_nbt_netlogon_response(&blob_out, talloc_tos(), &response);
		if (!NT_STATUS_IS_OK(status)) {
			DEBUG(0,("process_logon_packet: failed to push packet\n"));
			return;
		}

		if (DEBUGLEVEL >= 10) {
			NDR_PRINT_DEBUG(nbt_netlogon_response_from_pdc, &response.data.get_pdc);
		}

		send_mailslot(True, request.req.pdc.mailslot_name,
			(char *)blob_out.data,
			blob_out.length,
			lp_netbios_name(), 0x0,
			source_name,
			dgram->source_name.name_type,
			p->ip, ip, p->port);

		return;
	}

	case LOGON_SAM_LOGON_REQUEST: {
		char *source_addr;
		bool user_unknown = false;

		struct netlogon_samlogon_response samlogon;
		struct NETLOGON_SAM_LOGON_RESPONSE_NT40 nt4;

		if (global_nmbd_proxy_logon) {
			nmbd_proxy_logon(global_nmbd_proxy_logon,
					 ip, p, (const uint8_t *)buf, len);
			return;
		}

		source_addr = SMB_STRDUP(inet_ntoa(dgram->header.source_ip));
		if (source_addr == NULL) {
			DEBUG(3, ("out of memory copying client"
				  " address string\n"));
			return;
		}

		DEBUG(5,("process_logon_packet: LOGON_SAM_LOGON_REQUEST request from %s(%s) for %s, returning logon svr %s domain %s code %x token=%x\n",
			request.req.logon.computer_name,
			inet_ntoa(p->ip),
			request.req.logon.user_name,
			pdc_name,
			lp_workgroup(),
			LOGON_SAM_LOGON_RESPONSE,
			request.req.logon.lmnt_token));

		if (!request.req.logon.user_name) {
			user_unknown = true;
		}

		nt4.command		= user_unknown ? LOGON_SAM_LOGON_USER_UNKNOWN :
			LOGON_SAM_LOGON_RESPONSE;
		nt4.pdc_name		= pdc_name;
		nt4.user_name		= request.req.logon.user_name;
		nt4.domain_name		= lp_workgroup();
		nt4.nt_version		= NETLOGON_NT_VERSION_1;
		nt4.lmnt_token		= 0xffff;
		nt4.lm20_token		= 0xffff;
		
		samlogon.ntver = NETLOGON_NT_VERSION_1;
		samlogon.data.nt4 = nt4;
		
		if (DEBUGLEVEL >= 10) {
			NDR_PRINT_DEBUG(NETLOGON_SAM_LOGON_RESPONSE_NT40, &nt4);
		}

		response.response_type = NETLOGON_SAMLOGON;
		response.data.samlogon = samlogon;

		status = push_nbt_netlogon_response(&blob_out, talloc_tos(), &response);
		if (!NT_STATUS_IS_OK(status)) {
			DEBUG(0,("process_logon_packet: failed to push packet\n"));
			SAFE_FREE(source_addr);
			return;
		}

		/*
		 * handle delay.
		 * packets requeued after delay are marked as
		 * locked.
		 */
		if ((p->locked == False) &&
		    (strlen(request.req.logon.user_name) == 0) &&
		    delay_logon(source_name, source_addr))
		{
			struct timeval when;

			DEBUG(3, ("process_logon_packet: "
				  "delaying initial logon "
				  "reply for client %s(%s) for "
				  "%u milliseconds\n",
				  source_name, source_addr,
				  lp_init_logon_delay()));

			when = timeval_current_ofs_msec(lp_init_logon_delay());
			p->locked = true;
			event_add_timed(nmbd_event_context(),
					NULL,
					when,
					delayed_init_logon_handler,
					p);
		} else {
			DEBUG(3, ("process_logon_packet: "
				  "processing delayed initial "
				  "logon reply for client "
				  "%s(%s)\n",
				  source_name, source_addr));
			p->locked = false;
			send_mailslot(true, request.req.logon.mailslot_name,
				(char *)blob_out.data,
				blob_out.length,
				lp_netbios_name(), 0x0,
				source_name,
				dgram->source_name.name_type,
				p->ip, ip, p->port);
		}

		SAFE_FREE(source_addr);

		break;
	}

	/* Announce change to UAS or SAM.  Send by the domain controller when a
	replication event is required. */

	case NETLOGON_ANNOUNCE_UAS:
		DEBUG(5, ("Got NETLOGON_ANNOUNCE_UAS\n"));
		break;

	default:
		DEBUG(3,("process_logon_packet: Unknown domain request %d\n",
			request.command));
		return;
	}
}