Line data Source code
1 : /*
2 : Unix SMB/CIFS implementation.
3 : NBT netbios routines and daemon - version 2
4 : Copyright (C) Andrew Tridgell 1994-1998
5 : Copyright (C) Luke Kenneth Casson Leighton 1994-1998
6 : Copyright (C) Jeremy Allison 1994-2003
7 : Copyright (C) Jim McDonough <jmcd@us.ibm.com> 2002
8 :
9 : This program is free software; you can redistribute it and/or modify
10 : it under the terms of the GNU General Public License as published by
11 : the Free Software Foundation; either version 3 of the License, or
12 : (at your option) any later version.
13 :
14 : This program is distributed in the hope that it will be useful,
15 : but WITHOUT ANY WARRANTY; without even the implied warranty of
16 : MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 : GNU General Public License for more details.
18 :
19 : You should have received a copy of the GNU General Public License
20 : along with this program. If not, see <http://www.gnu.org/licenses/>.
21 :
22 : Revision History:
23 :
24 : */
25 :
26 : #include "includes.h"
27 : #include "../libcli/netlogon/netlogon.h"
28 : #include "../libcli/cldap/cldap.h"
29 : #include "../lib/tsocket/tsocket.h"
30 : #include "../libcli/security/security.h"
31 : #include "secrets.h"
32 : #include "nmbd/nmbd.h"
33 :
34 : struct sam_database_info {
35 : uint32_t index;
36 : uint32_t serial_lo, serial_hi;
37 : uint32_t date_lo, date_hi;
38 : };
39 :
40 : /**
41 : * check whether the client belongs to the hosts
42 : * for which initial logon should be delayed...
43 : */
44 2 : static bool delay_logon(const char *peer_name, const char *peer_addr)
45 : {
46 2 : const char **delay_list = lp_init_logon_delayed_hosts();
47 : const char *peer[2];
48 :
49 2 : if (delay_list == NULL) {
50 2 : return False;
51 : }
52 :
53 0 : peer[0] = peer_name;
54 0 : peer[1] = peer_addr;
55 :
56 0 : return list_match(delay_list, (const char *)peer, client_match);
57 : }
58 :
59 0 : static void delayed_init_logon_handler(struct tevent_context *event_ctx,
60 : struct tevent_timer *te,
61 : struct timeval now,
62 : void *private_data)
63 : {
64 0 : struct packet_struct *p = (struct packet_struct *)private_data;
65 :
66 0 : DEBUG(10, ("delayed_init_logon_handler (%lx): re-queuing packet.\n",
67 : (unsigned long)te));
68 :
69 0 : queue_packet(p);
70 :
71 0 : TALLOC_FREE(te);
72 0 : }
73 :
74 : struct nmbd_proxy_logon_context {
75 : struct cldap_socket *cldap_sock;
76 : };
77 :
78 : static struct nmbd_proxy_logon_context *global_nmbd_proxy_logon;
79 :
80 43 : bool initialize_nmbd_proxy_logon(void)
81 : {
82 43 : const char *cldap_server = lp_parm_const_string(-1, "nmbd_proxy_logon",
83 : "cldap_server", NULL);
84 : struct nmbd_proxy_logon_context *ctx;
85 : NTSTATUS status;
86 : struct in_addr addr;
87 : char addrstr[INET_ADDRSTRLEN];
88 : const char *server_str;
89 : int ret;
90 : struct tsocket_address *server_addr;
91 :
92 43 : if (!cldap_server) {
93 43 : return true;
94 : }
95 :
96 0 : addr = interpret_addr2(cldap_server);
97 0 : server_str = inet_ntop(AF_INET, &addr,
98 : addrstr, sizeof(addrstr));
99 0 : if (!server_str || strcmp("0.0.0.0", server_str) == 0) {
100 0 : DEBUG(0,("Failed to resolve[%s] for nmbd_proxy_logon\n",
101 : cldap_server));
102 0 : return false;
103 : }
104 :
105 0 : ctx = talloc_zero(nmbd_event_context(),
106 : struct nmbd_proxy_logon_context);
107 0 : if (!ctx) {
108 0 : return false;
109 : }
110 :
111 0 : ret = tsocket_address_inet_from_strings(ctx, "ipv4",
112 : server_str, LDAP_PORT,
113 : &server_addr);
114 0 : if (ret != 0) {
115 0 : TALLOC_FREE(ctx);
116 0 : status = map_nt_error_from_unix(errno);
117 0 : DEBUG(0,("Failed to create cldap tsocket_address for %s - %s\n",
118 : server_str, nt_errstr(status)));
119 0 : return false;
120 : }
121 :
122 : /* we create a connected udp socket */
123 0 : status = cldap_socket_init(ctx, NULL, server_addr, &ctx->cldap_sock);
124 0 : TALLOC_FREE(server_addr);
125 0 : if (!NT_STATUS_IS_OK(status)) {
126 0 : TALLOC_FREE(ctx);
127 0 : DEBUG(0,("failed to create cldap socket for %s: %s\n",
128 : server_str, nt_errstr(status)));
129 0 : return false;
130 : }
131 :
132 0 : global_nmbd_proxy_logon = ctx;
133 0 : return true;
134 : }
135 :
136 : struct nmbd_proxy_logon_state {
137 : struct in_addr local_ip;
138 : struct packet_struct *p;
139 : const char *remote_name;
140 : uint8_t remote_name_type;
141 : const char *remote_mailslot;
142 : struct nbt_netlogon_packet req;
143 : struct nbt_netlogon_response resp;
144 : struct cldap_netlogon io;
145 : };
146 :
147 0 : static int nmbd_proxy_logon_state_destructor(struct nmbd_proxy_logon_state *s)
148 : {
149 0 : s->p->locked = false;
150 0 : free_packet(s->p);
151 0 : return 0;
152 : }
153 :
154 : static void nmbd_proxy_logon_done(struct tevent_req *subreq);
155 :
156 0 : static void nmbd_proxy_logon(struct nmbd_proxy_logon_context *ctx,
157 : struct in_addr local_ip,
158 : struct packet_struct *p,
159 : const uint8_t *buf,
160 : uint32_t len)
161 : {
162 : struct nmbd_proxy_logon_state *state;
163 : enum ndr_err_code ndr_err;
164 0 : DATA_BLOB blob = data_blob_const(buf, len);
165 0 : const char *computer_name = NULL;
166 0 : const char *mailslot_name = NULL;
167 0 : const char *user_name = NULL;
168 0 : const char *domain_sid = NULL;
169 0 : uint32_t acct_control = 0;
170 0 : uint32_t nt_version = 0;
171 : struct tevent_req *subreq;
172 : fstring source_name;
173 0 : struct dgram_packet *dgram = &p->packet.dgram;
174 :
175 0 : state = talloc_zero(ctx, struct nmbd_proxy_logon_state);
176 0 : if (!state) {
177 0 : DEBUG(0,("failed to allocate nmbd_proxy_logon_state\n"));
178 0 : return;
179 : }
180 :
181 0 : pull_ascii_nstring(source_name, sizeof(source_name), dgram->source_name.name);
182 0 : state->remote_name = talloc_strdup(state, source_name);
183 0 : state->remote_name_type = dgram->source_name.name_type,
184 0 : state->local_ip = local_ip;
185 0 : state->p = p;
186 :
187 0 : ndr_err = ndr_pull_struct_blob(
188 0 : &blob, state, &state->req,
189 : (ndr_pull_flags_fn_t)ndr_pull_nbt_netlogon_packet);
190 0 : if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
191 0 : NTSTATUS status = ndr_map_error2ntstatus(ndr_err);
192 0 : DEBUG(0,("failed parse nbt_netlogon_packet: %s\n",
193 : nt_errstr(status)));
194 0 : TALLOC_FREE(state);
195 0 : return;
196 : }
197 :
198 0 : if (DEBUGLEVEL >= 10) {
199 0 : DEBUG(10, ("nmbd_proxy_logon:\n"));
200 0 : NDR_PRINT_DEBUG(nbt_netlogon_packet, &state->req);
201 : }
202 :
203 0 : switch (state->req.command) {
204 0 : case LOGON_SAM_LOGON_REQUEST:
205 0 : computer_name = state->req.req.logon.computer_name;
206 0 : user_name = state->req.req.logon.user_name;
207 0 : mailslot_name = state->req.req.logon.mailslot_name;
208 0 : acct_control = state->req.req.logon.acct_control;
209 0 : if (state->req.req.logon.sid_size > 0) {
210 0 : domain_sid = dom_sid_string(state,
211 0 : &state->req.req.logon.sid);
212 0 : if (!domain_sid) {
213 0 : DEBUG(0,("failed to get a string for sid\n"));
214 0 : TALLOC_FREE(state);
215 0 : return;
216 : }
217 : }
218 0 : nt_version = state->req.req.logon.nt_version;
219 0 : break;
220 :
221 0 : default:
222 : /* this can't happen as the caller already checks the command */
223 0 : break;
224 : }
225 :
226 0 : state->remote_mailslot = mailslot_name;
227 :
228 0 : if (user_name && strlen(user_name) == 0) {
229 0 : user_name = NULL;
230 : }
231 :
232 0 : if (computer_name && strlen(computer_name) == 0) {
233 0 : computer_name = NULL;
234 : }
235 :
236 : /*
237 : * as the socket is connected,
238 : * we don't need to specify the destination
239 : */
240 0 : state->io.in.dest_address = NULL;
241 0 : state->io.in.dest_port = 0;
242 0 : state->io.in.realm = NULL;
243 0 : state->io.in.host = computer_name;
244 0 : state->io.in.user = user_name;
245 0 : state->io.in.domain_guid = NULL;
246 0 : state->io.in.domain_sid = domain_sid;
247 0 : state->io.in.acct_control = acct_control;
248 0 : state->io.in.version = nt_version;
249 0 : state->io.in.map_response = false;
250 :
251 0 : subreq = cldap_netlogon_send(state, nmbd_event_context(),
252 : ctx->cldap_sock,
253 0 : &state->io);
254 0 : if (!subreq) {
255 0 : DEBUG(0,("failed to send cldap netlogon call\n"));
256 0 : TALLOC_FREE(state);
257 0 : return;
258 : }
259 0 : tevent_req_set_callback(subreq, nmbd_proxy_logon_done, state);
260 :
261 : /* we reply async */
262 0 : state->p->locked = true;
263 0 : talloc_set_destructor(state, nmbd_proxy_logon_state_destructor);
264 : }
265 :
266 0 : static void nmbd_proxy_logon_done(struct tevent_req *subreq)
267 : {
268 : struct nmbd_proxy_logon_state *state =
269 0 : tevent_req_callback_data(subreq,
270 : struct nmbd_proxy_logon_state);
271 : NTSTATUS status;
272 0 : DATA_BLOB response = data_blob_null;
273 :
274 0 : status = cldap_netlogon_recv(subreq, state, &state->io);
275 0 : if (!NT_STATUS_IS_OK(status)) {
276 0 : DEBUG(0,("failed to recv cldap netlogon call: %s\n",
277 : nt_errstr(status)));
278 0 : TALLOC_FREE(state);
279 0 : return;
280 : }
281 :
282 0 : status = push_netlogon_samlogon_response(&response, state,
283 : &state->io.out.netlogon);
284 0 : if (!NT_STATUS_IS_OK(status)) {
285 0 : DEBUG(0,("failed to push netlogon_samlogon_response: %s\n",
286 : nt_errstr(status)));
287 0 : TALLOC_FREE(state);
288 0 : return;
289 : }
290 :
291 0 : send_mailslot(true, state->remote_mailslot,
292 0 : (char *)response.data, response.length,
293 : lp_netbios_name(), 0x0,
294 : state->remote_name,
295 0 : state->remote_name_type,
296 0 : state->p->ip,
297 : state->local_ip,
298 0 : state->p->port);
299 0 : TALLOC_FREE(state);
300 : }
301 :
302 : /****************************************************************************
303 : Process a domain logon packet
304 : **************************************************************************/
305 :
306 27 : void process_logon_packet(struct packet_struct *p, const char *buf,int len,
307 : const char *mailslot)
308 : {
309 : fstring source_name;
310 27 : struct dgram_packet *dgram = &p->packet.dgram;
311 : struct sockaddr_storage ss;
312 : const struct sockaddr_storage *pss;
313 : struct in_addr ip;
314 :
315 : DATA_BLOB blob_in, blob_out;
316 : enum ndr_err_code ndr_err;
317 : struct nbt_netlogon_packet request;
318 : struct nbt_netlogon_response response;
319 : NTSTATUS status;
320 : const char *pdc_name;
321 :
322 27 : in_addr_to_sockaddr_storage(&ss, p->ip);
323 27 : pss = iface_ip((struct sockaddr *)&ss);
324 27 : if (!pss) {
325 0 : DEBUG(5,("process_logon_packet:can't find outgoing interface "
326 : "for packet from IP %s\n",
327 : inet_ntoa(p->ip) ));
328 6 : return;
329 : }
330 27 : ip = ((const struct sockaddr_in *)pss)->sin_addr;
331 :
332 27 : if (!IS_DC) {
333 0 : DEBUG(5,("process_logon_packet: Logon packet received from IP %s and domain \
334 : logons are not enabled.\n", inet_ntoa(p->ip) ));
335 0 : return;
336 : }
337 :
338 27 : pull_ascii_nstring(source_name, sizeof(source_name), dgram->source_name.name);
339 :
340 27 : pdc_name = talloc_asprintf(talloc_tos(), "\\\\%s", lp_netbios_name());
341 27 : if (!pdc_name) {
342 0 : return;
343 : }
344 :
345 27 : ZERO_STRUCT(request);
346 :
347 27 : blob_in = data_blob_const(buf, len);
348 :
349 27 : ndr_err = ndr_pull_struct_blob(&blob_in, talloc_tos(), &request,
350 : (ndr_pull_flags_fn_t)ndr_pull_nbt_netlogon_packet);
351 27 : if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
352 0 : DEBUG(1,("process_logon_packet: Failed to pull logon packet\n"));
353 0 : return;
354 : }
355 :
356 27 : if (DEBUGLEVEL >= 10) {
357 0 : NDR_PRINT_DEBUG(nbt_netlogon_packet, &request);
358 : }
359 :
360 27 : DEBUG(4,("process_logon_packet: Logon from %s: code = 0x%x\n",
361 : inet_ntoa(p->ip), request.command));
362 :
363 27 : switch (request.command) {
364 0 : case LOGON_REQUEST: {
365 :
366 : struct nbt_netlogon_response2 response2;
367 :
368 0 : DEBUG(5,("process_logon_packet: Domain login request from %s at IP %s user=%s token=%x\n",
369 : request.req.logon0.computer_name, inet_ntoa(p->ip),
370 : request.req.logon0.user_name,
371 : request.req.logon0.lm20_token));
372 :
373 0 : response2.command = LOGON_RESPONSE2;
374 0 : response2.pdc_name = pdc_name;
375 0 : response2.lm20_token = 0xffff;
376 :
377 0 : response.response_type = NETLOGON_RESPONSE2;
378 0 : response.data.response2 = response2;
379 :
380 0 : status = push_nbt_netlogon_response(&blob_out, talloc_tos(), &response);
381 0 : if (!NT_STATUS_IS_OK(status)) {
382 0 : DEBUG(0,("process_logon_packet: failed to push packet\n"));
383 0 : return;
384 : }
385 :
386 0 : if (DEBUGLEVEL >= 10) {
387 0 : NDR_PRINT_DEBUG(nbt_netlogon_response2, &response.data.response2);
388 : }
389 :
390 0 : send_mailslot(True, request.req.logon0.mailslot_name,
391 0 : (char *)blob_out.data,
392 : blob_out.length,
393 : lp_netbios_name(), 0x0,
394 : source_name,
395 0 : dgram->source_name.name_type,
396 : p->ip, ip, p->port);
397 0 : break;
398 : }
399 :
400 6 : case LOGON_PRIMARY_QUERY: {
401 :
402 : struct nbt_netlogon_response_from_pdc get_pdc;
403 :
404 6 : if (!lp_domain_master()) {
405 : /* We're not Primary Domain Controller -- ignore this */
406 0 : return;
407 : }
408 :
409 6 : DEBUG(5,("process_logon_packet: GETDC request from %s at IP %s, "
410 : "reporting %s domain %s 0x%x ntversion=%x lm_nt token=%x lm_20 token=%x\n",
411 : request.req.pdc.computer_name,
412 : inet_ntoa(p->ip),
413 : lp_netbios_name(),
414 : lp_workgroup(),
415 : NETLOGON_RESPONSE_FROM_PDC,
416 : request.req.pdc.nt_version,
417 : request.req.pdc.lmnt_token,
418 : request.req.pdc.lm20_token));
419 :
420 6 : get_pdc.command = NETLOGON_RESPONSE_FROM_PDC;
421 6 : get_pdc.pdc_name = lp_netbios_name();
422 6 : get_pdc._pad = data_blob_null;
423 6 : get_pdc.unicode_pdc_name = lp_netbios_name();
424 6 : get_pdc.domain_name = lp_workgroup();
425 6 : get_pdc.nt_version = NETLOGON_NT_VERSION_1;
426 6 : get_pdc.lmnt_token = 0xffff;
427 6 : get_pdc.lm20_token = 0xffff;
428 :
429 6 : response.response_type = NETLOGON_GET_PDC;
430 6 : response.data.get_pdc = get_pdc;
431 :
432 6 : status = push_nbt_netlogon_response(&blob_out, talloc_tos(), &response);
433 6 : if (!NT_STATUS_IS_OK(status)) {
434 0 : DEBUG(0,("process_logon_packet: failed to push packet\n"));
435 0 : return;
436 : }
437 :
438 6 : if (DEBUGLEVEL >= 10) {
439 0 : NDR_PRINT_DEBUG(nbt_netlogon_response_from_pdc, &response.data.get_pdc);
440 : }
441 :
442 12 : send_mailslot(True, request.req.pdc.mailslot_name,
443 6 : (char *)blob_out.data,
444 : blob_out.length,
445 : lp_netbios_name(), 0x0,
446 : source_name,
447 6 : dgram->source_name.name_type,
448 : p->ip, ip, p->port);
449 :
450 6 : return;
451 : }
452 :
453 21 : case LOGON_SAM_LOGON_REQUEST: {
454 : char *source_addr;
455 21 : bool user_unknown = false;
456 :
457 : struct netlogon_samlogon_response samlogon;
458 : struct NETLOGON_SAM_LOGON_RESPONSE_NT40 nt4;
459 :
460 21 : if (global_nmbd_proxy_logon) {
461 0 : nmbd_proxy_logon(global_nmbd_proxy_logon,
462 : ip, p, (const uint8_t *)buf, len);
463 0 : return;
464 : }
465 :
466 21 : source_addr = SMB_STRDUP(inet_ntoa(dgram->header.source_ip));
467 21 : if (source_addr == NULL) {
468 0 : DEBUG(3, ("out of memory copying client"
469 : " address string\n"));
470 0 : return;
471 : }
472 :
473 21 : 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",
474 : request.req.logon.computer_name,
475 : inet_ntoa(p->ip),
476 : request.req.logon.user_name,
477 : pdc_name,
478 : lp_workgroup(),
479 : LOGON_SAM_LOGON_RESPONSE,
480 : request.req.logon.lmnt_token));
481 :
482 21 : if (!request.req.logon.user_name) {
483 0 : user_unknown = true;
484 : }
485 :
486 21 : nt4.command = user_unknown ? LOGON_SAM_LOGON_USER_UNKNOWN :
487 : LOGON_SAM_LOGON_RESPONSE;
488 21 : nt4.pdc_name = pdc_name;
489 21 : nt4.user_name = request.req.logon.user_name;
490 21 : nt4.domain_name = lp_workgroup();
491 21 : nt4.nt_version = NETLOGON_NT_VERSION_1;
492 21 : nt4.lmnt_token = 0xffff;
493 21 : nt4.lm20_token = 0xffff;
494 :
495 21 : samlogon.ntver = NETLOGON_NT_VERSION_1;
496 21 : samlogon.data.nt4 = nt4;
497 :
498 21 : if (DEBUGLEVEL >= 10) {
499 0 : NDR_PRINT_DEBUG(NETLOGON_SAM_LOGON_RESPONSE_NT40, &nt4);
500 : }
501 :
502 21 : response.response_type = NETLOGON_SAMLOGON;
503 21 : response.data.samlogon = samlogon;
504 :
505 21 : status = push_nbt_netlogon_response(&blob_out, talloc_tos(), &response);
506 21 : if (!NT_STATUS_IS_OK(status)) {
507 0 : DEBUG(0,("process_logon_packet: failed to push packet\n"));
508 0 : SAFE_FREE(source_addr);
509 0 : return;
510 : }
511 :
512 : /*
513 : * handle delay.
514 : * packets requeued after delay are marked as
515 : * locked.
516 : */
517 21 : if ((p->locked == False) &&
518 23 : (strlen(request.req.logon.user_name) == 0) &&
519 2 : delay_logon(source_name, source_addr))
520 0 : {
521 : struct timeval when;
522 :
523 0 : DEBUG(3, ("process_logon_packet: "
524 : "delaying initial logon "
525 : "reply for client %s(%s) for "
526 : "%u milliseconds\n",
527 : source_name, source_addr,
528 : lp_init_logon_delay()));
529 :
530 0 : when = timeval_current_ofs_msec(lp_init_logon_delay());
531 0 : p->locked = true;
532 0 : tevent_add_timer(nmbd_event_context(),
533 : NULL,
534 : when,
535 : delayed_init_logon_handler,
536 : p);
537 : } else {
538 21 : DEBUG(3, ("process_logon_packet: "
539 : "processing delayed initial "
540 : "logon reply for client "
541 : "%s(%s)\n",
542 : source_name, source_addr));
543 21 : p->locked = false;
544 42 : send_mailslot(true, request.req.logon.mailslot_name,
545 21 : (char *)blob_out.data,
546 : blob_out.length,
547 : lp_netbios_name(), 0x0,
548 : source_name,
549 21 : dgram->source_name.name_type,
550 : p->ip, ip, p->port);
551 : }
552 :
553 21 : SAFE_FREE(source_addr);
554 :
555 21 : break;
556 : }
557 :
558 : /* Announce change to UAS or SAM. Send by the domain controller when a
559 : replication event is required. */
560 :
561 0 : case NETLOGON_ANNOUNCE_UAS:
562 0 : DEBUG(5, ("Got NETLOGON_ANNOUNCE_UAS\n"));
563 0 : break;
564 :
565 0 : default:
566 0 : DEBUG(3,("process_logon_packet: Unknown domain request %d\n",
567 : request.command));
568 0 : return;
569 : }
570 : }
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