source: vendor/current/source3/nmbd/nmbd_processlogon.c

Last change on this file was 988, checked in by Silvan Scherrer, 9 years ago

Samba Server: update vendor to version 4.4.3
File size: 15.1 KB
Line 
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
34struct 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 */
44static bool delay_logon(const char *peer_name, const char *peer_addr)
45{
46 const char **delay_list = lp_init_logon_delayed_hosts();
47 const char *peer[2];
48
49 if (delay_list == NULL) {
50 return False;
51 }
52
53 peer[0] = peer_name;
54 peer[1] = peer_addr;
55
56 return list_match(delay_list, (const char *)peer, client_match);
57}
58
59static 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 struct packet_struct *p = (struct packet_struct *)private_data;
65
66 DEBUG(10, ("delayed_init_logon_handler (%lx): re-queuing packet.\n",
67 (unsigned long)te));
68
69 queue_packet(p);
70
71 TALLOC_FREE(te);
72}
73
74struct nmbd_proxy_logon_context {
75 struct cldap_socket *cldap_sock;
76};
77
78static struct nmbd_proxy_logon_context *global_nmbd_proxy_logon;
79
80bool initialize_nmbd_proxy_logon(void)
81{
82 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 if (!cldap_server) {
93 return true;
94 }
95
96 addr = interpret_addr2(cldap_server);
97 server_str = inet_ntop(AF_INET, &addr,
98 addrstr, sizeof(addrstr));
99 if (!server_str || strcmp("0.0.0.0", server_str) == 0) {
100 DEBUG(0,("Failed to resolve[%s] for nmbd_proxy_logon\n",
101 cldap_server));
102 return false;
103 }
104
105 ctx = talloc_zero(nmbd_event_context(),
106 struct nmbd_proxy_logon_context);
107 if (!ctx) {
108 return false;
109 }
110
111 ret = tsocket_address_inet_from_strings(ctx, "ipv4",
112 server_str, LDAP_PORT,
113 &server_addr);
114 if (ret != 0) {
115 TALLOC_FREE(ctx);
116 status = map_nt_error_from_unix(errno);
117 DEBUG(0,("Failed to create cldap tsocket_address for %s - %s\n",
118 server_str, nt_errstr(status)));
119 return false;
120 }
121
122 /* we create a connected udp socket */
123 status = cldap_socket_init(ctx, NULL, server_addr, &ctx->cldap_sock);
124 TALLOC_FREE(server_addr);
125 if (!NT_STATUS_IS_OK(status)) {
126 TALLOC_FREE(ctx);
127 DEBUG(0,("failed to create cldap socket for %s: %s\n",
128 server_str, nt_errstr(status)));
129 return false;
130 }
131
132 global_nmbd_proxy_logon = ctx;
133 return true;
134}
135
136struct 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
147static int nmbd_proxy_logon_state_destructor(struct nmbd_proxy_logon_state *s)
148{
149 s->p->locked = false;
150 free_packet(s->p);
151 return 0;
152}
153
154static void nmbd_proxy_logon_done(struct tevent_req *subreq);
155
156static 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 DATA_BLOB blob = data_blob_const(buf, len);
165 const char *computer_name = NULL;
166 const char *mailslot_name = NULL;
167 const char *user_name = NULL;
168 const char *domain_sid = NULL;
169 uint32_t acct_control = 0;
170 uint32_t nt_version = 0;
171 struct tevent_req *subreq;
172 fstring source_name;
173 struct dgram_packet *dgram = &p->packet.dgram;
174
175 state = talloc_zero(ctx, struct nmbd_proxy_logon_state);
176 if (!state) {
177 DEBUG(0,("failed to allocate nmbd_proxy_logon_state\n"));
178 return;
179 }
180
181 pull_ascii_nstring(source_name, sizeof(source_name), dgram->source_name.name);
182 state->remote_name = talloc_strdup(state, source_name);
183 state->remote_name_type = dgram->source_name.name_type,
184 state->local_ip = local_ip;
185 state->p = p;
186
187 ndr_err = ndr_pull_struct_blob(
188 &blob, state, &state->req,
189 (ndr_pull_flags_fn_t)ndr_pull_nbt_netlogon_packet);
190 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
191 NTSTATUS status = ndr_map_error2ntstatus(ndr_err);
192 DEBUG(0,("failed parse nbt_netlogon_packet: %s\n",
193 nt_errstr(status)));
194 TALLOC_FREE(state);
195 return;
196 }
197
198 if (DEBUGLEVEL >= 10) {
199 DEBUG(10, ("nmbd_proxy_logon:\n"));
200 NDR_PRINT_DEBUG(nbt_netlogon_packet, &state->req);
201 }
202
203 switch (state->req.command) {
204 case LOGON_SAM_LOGON_REQUEST:
205 computer_name = state->req.req.logon.computer_name;
206 user_name = state->req.req.logon.user_name;
207 mailslot_name = state->req.req.logon.mailslot_name;
208 acct_control = state->req.req.logon.acct_control;
209 if (state->req.req.logon.sid_size > 0) {
210 domain_sid = dom_sid_string(state,
211 &state->req.req.logon.sid);
212 if (!domain_sid) {
213 DEBUG(0,("failed to get a string for sid\n"));
214 TALLOC_FREE(state);
215 return;
216 }
217 }
218 nt_version = state->req.req.logon.nt_version;
219 break;
220
221 default:
222 /* this can't happen as the caller already checks the command */
223 break;
224 }
225
226 state->remote_mailslot = mailslot_name;
227
228 if (user_name && strlen(user_name) == 0) {
229 user_name = NULL;
230 }
231
232 if (computer_name && strlen(computer_name) == 0) {
233 computer_name = NULL;
234 }
235
236 /*
237 * as the socket is connected,
238 * we don't need to specify the destination
239 */
240 state->io.in.dest_address = NULL;
241 state->io.in.dest_port = 0;
242 state->io.in.realm = NULL;
243 state->io.in.host = computer_name;
244 state->io.in.user = user_name;
245 state->io.in.domain_guid = NULL;
246 state->io.in.domain_sid = domain_sid;
247 state->io.in.acct_control = acct_control;
248 state->io.in.version = nt_version;
249 state->io.in.map_response = false;
250
251 subreq = cldap_netlogon_send(state, nmbd_event_context(),
252 ctx->cldap_sock,
253 &state->io);
254 if (!subreq) {
255 DEBUG(0,("failed to send cldap netlogon call\n"));
256 TALLOC_FREE(state);
257 return;
258 }
259 tevent_req_set_callback(subreq, nmbd_proxy_logon_done, state);
260
261 /* we reply async */
262 state->p->locked = true;
263 talloc_set_destructor(state, nmbd_proxy_logon_state_destructor);
264}
265
266static void nmbd_proxy_logon_done(struct tevent_req *subreq)
267{
268 struct nmbd_proxy_logon_state *state =
269 tevent_req_callback_data(subreq,
270 struct nmbd_proxy_logon_state);
271 NTSTATUS status;
272 DATA_BLOB response = data_blob_null;
273
274 status = cldap_netlogon_recv(subreq, state, &state->io);
275 if (!NT_STATUS_IS_OK(status)) {
276 DEBUG(0,("failed to recv cldap netlogon call: %s\n",
277 nt_errstr(status)));
278 TALLOC_FREE(state);
279 return;
280 }
281
282 status = push_netlogon_samlogon_response(&response, state,
283 &state->io.out.netlogon);
284 if (!NT_STATUS_IS_OK(status)) {
285 DEBUG(0,("failed to push netlogon_samlogon_response: %s\n",
286 nt_errstr(status)));
287 TALLOC_FREE(state);
288 return;
289 }
290
291 send_mailslot(true, state->remote_mailslot,
292 (char *)response.data, response.length,
293 lp_netbios_name(), 0x0,
294 state->remote_name,
295 state->remote_name_type,
296 state->p->ip,
297 state->local_ip,
298 state->p->port);
299 TALLOC_FREE(state);
300}
301
302/****************************************************************************
303Process a domain logon packet
304**************************************************************************/
305
306void process_logon_packet(struct packet_struct *p, const char *buf,int len,
307 const char *mailslot)
308{
309 fstring source_name;
310 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 in_addr_to_sockaddr_storage(&ss, p->ip);
323 pss = iface_ip((struct sockaddr *)&ss);
324 if (!pss) {
325 DEBUG(5,("process_logon_packet:can't find outgoing interface "
326 "for packet from IP %s\n",
327 inet_ntoa(p->ip) ));
328 return;
329 }
330 ip = ((const struct sockaddr_in *)pss)->sin_addr;
331
332 if (!IS_DC) {
333 DEBUG(5,("process_logon_packet: Logon packet received from IP %s and domain \
334logons are not enabled.\n", inet_ntoa(p->ip) ));
335 return;
336 }
337
338 pull_ascii_nstring(source_name, sizeof(source_name), dgram->source_name.name);
339
340 pdc_name = talloc_asprintf(talloc_tos(), "\\\\%s", lp_netbios_name());
341 if (!pdc_name) {
342 return;
343 }
344
345 ZERO_STRUCT(request);
346
347 blob_in = data_blob_const(buf, len);
348
349 ndr_err = ndr_pull_struct_blob(&blob_in, talloc_tos(), &request,
350 (ndr_pull_flags_fn_t)ndr_pull_nbt_netlogon_packet);
351 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
352 DEBUG(1,("process_logon_packet: Failed to pull logon packet\n"));
353 return;
354 }
355
356 if (DEBUGLEVEL >= 10) {
357 NDR_PRINT_DEBUG(nbt_netlogon_packet, &request);
358 }
359
360 DEBUG(4,("process_logon_packet: Logon from %s: code = 0x%x\n",
361 inet_ntoa(p->ip), request.command));
362
363 switch (request.command) {
364 case LOGON_REQUEST: {
365
366 struct nbt_netlogon_response2 response2;
367
368 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 response2.command = LOGON_RESPONSE2;
374 response2.pdc_name = pdc_name;
375 response2.lm20_token = 0xffff;
376
377 response.response_type = NETLOGON_RESPONSE2;
378 response.data.response2 = response2;
379
380 status = push_nbt_netlogon_response(&blob_out, talloc_tos(), &response);
381 if (!NT_STATUS_IS_OK(status)) {
382 DEBUG(0,("process_logon_packet: failed to push packet\n"));
383 return;
384 }
385
386 if (DEBUGLEVEL >= 10) {
387 NDR_PRINT_DEBUG(nbt_netlogon_response2, &response.data.response2);
388 }
389
390 send_mailslot(True, request.req.logon0.mailslot_name,
391 (char *)blob_out.data,
392 blob_out.length,
393 lp_netbios_name(), 0x0,
394 source_name,
395 dgram->source_name.name_type,
396 p->ip, ip, p->port);
397 break;
398 }
399
400 case LOGON_PRIMARY_QUERY: {
401
402 struct nbt_netlogon_response_from_pdc get_pdc;
403
404 if (!lp_domain_master()) {
405 /* We're not Primary Domain Controller -- ignore this */
406 return;
407 }
408
409 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 get_pdc.command = NETLOGON_RESPONSE_FROM_PDC;
421 get_pdc.pdc_name = lp_netbios_name();
422 get_pdc._pad = data_blob_null;
423 get_pdc.unicode_pdc_name = lp_netbios_name();
424 get_pdc.domain_name = lp_workgroup();
425 get_pdc.nt_version = NETLOGON_NT_VERSION_1;
426 get_pdc.lmnt_token = 0xffff;
427 get_pdc.lm20_token = 0xffff;
428
429 response.response_type = NETLOGON_GET_PDC;
430 response.data.get_pdc = get_pdc;
431
432 status = push_nbt_netlogon_response(&blob_out, talloc_tos(), &response);
433 if (!NT_STATUS_IS_OK(status)) {
434 DEBUG(0,("process_logon_packet: failed to push packet\n"));
435 return;
436 }
437
438 if (DEBUGLEVEL >= 10) {
439 NDR_PRINT_DEBUG(nbt_netlogon_response_from_pdc, &response.data.get_pdc);
440 }
441
442 send_mailslot(True, request.req.pdc.mailslot_name,
443 (char *)blob_out.data,
444 blob_out.length,
445 lp_netbios_name(), 0x0,
446 source_name,
447 dgram->source_name.name_type,
448 p->ip, ip, p->port);
449
450 return;
451 }
452
453 case LOGON_SAM_LOGON_REQUEST: {
454 char *source_addr;
455 bool user_unknown = false;
456
457 struct netlogon_samlogon_response samlogon;
458 struct NETLOGON_SAM_LOGON_RESPONSE_NT40 nt4;
459
460 if (global_nmbd_proxy_logon) {
461 nmbd_proxy_logon(global_nmbd_proxy_logon,
462 ip, p, (const uint8_t *)buf, len);
463 return;
464 }
465
466 source_addr = SMB_STRDUP(inet_ntoa(dgram->header.source_ip));
467 if (source_addr == NULL) {
468 DEBUG(3, ("out of memory copying client"
469 " address string\n"));
470 return;
471 }
472
473 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 if (!request.req.logon.user_name) {
483 user_unknown = true;
484 }
485
486 nt4.command = user_unknown ? LOGON_SAM_LOGON_USER_UNKNOWN :
487 LOGON_SAM_LOGON_RESPONSE;
488 nt4.pdc_name = pdc_name;
489 nt4.user_name = request.req.logon.user_name;
490 nt4.domain_name = lp_workgroup();
491 nt4.nt_version = NETLOGON_NT_VERSION_1;
492 nt4.lmnt_token = 0xffff;
493 nt4.lm20_token = 0xffff;
494
495 samlogon.ntver = NETLOGON_NT_VERSION_1;
496 samlogon.data.nt4 = nt4;
497
498 if (DEBUGLEVEL >= 10) {
499 NDR_PRINT_DEBUG(NETLOGON_SAM_LOGON_RESPONSE_NT40, &nt4);
500 }
501
502 response.response_type = NETLOGON_SAMLOGON;
503 response.data.samlogon = samlogon;
504
505 status = push_nbt_netlogon_response(&blob_out, talloc_tos(), &response);
506 if (!NT_STATUS_IS_OK(status)) {
507 DEBUG(0,("process_logon_packet: failed to push packet\n"));
508 SAFE_FREE(source_addr);
509 return;
510 }
511
512 /*
513 * handle delay.
514 * packets requeued after delay are marked as
515 * locked.
516 */
517 if ((p->locked == False) &&
518 (strlen(request.req.logon.user_name) == 0) &&
519 delay_logon(source_name, source_addr))
520 {
521 struct timeval when;
522
523 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 when = timeval_current_ofs_msec(lp_init_logon_delay());
531 p->locked = true;
532 tevent_add_timer(nmbd_event_context(),
533 NULL,
534 when,
535 delayed_init_logon_handler,
536 p);
537 } else {
538 DEBUG(3, ("process_logon_packet: "
539 "processing delayed initial "
540 "logon reply for client "
541 "%s(%s)\n",
542 source_name, source_addr));
543 p->locked = false;
544 send_mailslot(true, request.req.logon.mailslot_name,
545 (char *)blob_out.data,
546 blob_out.length,
547 lp_netbios_name(), 0x0,
548 source_name,
549 dgram->source_name.name_type,
550 p->ip, ip, p->port);
551 }
552
553 SAFE_FREE(source_addr);
554
555 break;
556 }
557
558 /* Announce change to UAS or SAM. Send by the domain controller when a
559 replication event is required. */
560
561 case NETLOGON_ANNOUNCE_UAS:
562 DEBUG(5, ("Got NETLOGON_ANNOUNCE_UAS\n"));
563 break;
564
565 default:
566 DEBUG(3,("process_logon_packet: Unknown domain request %d\n",
567 request.command));
568 return;
569 }
570}
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