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VERSION: Release Samba 4.3.0rc1
[Samba.git] / source4 / kdc / kdc.c
blobbb476e1e6578c31440607a421dc183fbde3f21f3
1 /*
2 Unix SMB/CIFS implementation.
3
4 KDC Server startup
5
6 Copyright (C) Andrew Bartlett <abartlet@samba.org> 2005-2008
7 Copyright (C) Andrew Tridgell 2005
8 Copyright (C) Stefan Metzmacher 2005
9
10 This program is free software; you can redistribute it and/or modify
11 it under the terms of the GNU General Public License as published by
12 the Free Software Foundation; either version 3 of the License, or
13 (at your option) any later version.
14
15 This program is distributed in the hope that it will be useful,
16 but WITHOUT ANY WARRANTY; without even the implied warranty of
17 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 GNU General Public License for more details.
19
20 You should have received a copy of the GNU General Public License
21 along with this program. If not, see <http://www.gnu.org/licenses/>.
22 */
23
24 #include "includes.h"
25 #include "smbd/process_model.h"
26 #include "lib/tsocket/tsocket.h"
27 #include "libcli/util/tstream.h"
28 #include "lib/messaging/irpc.h"
29 #include "librpc/gen_ndr/ndr_irpc.h"
30 #include "librpc/gen_ndr/ndr_krb5pac.h"
31 #include "lib/stream/packet.h"
32 #include "lib/socket/netif.h"
33 #include "param/param.h"
34 #include "kdc/kdc-glue.h"
35 #include "kdc/pac-glue.h"
36 #include "dsdb/samdb/samdb.h"
37 #include "auth/session.h"
38
39 NTSTATUS server_service_kdc_init(void);
40
41 extern struct krb5plugin_windc_ftable windc_plugin_table;
42
43 static NTSTATUS kdc_proxy_unavailable_error(struct kdc_server *kdc,
44 TALLOC_CTX *mem_ctx,
45 DATA_BLOB *out)
46 {
47 int kret;
48 krb5_data k5_error_blob;
49
50 kret = krb5_mk_error(kdc->smb_krb5_context->krb5_context,
51 KRB5KDC_ERR_SVC_UNAVAILABLE, NULL, NULL,
52 NULL, NULL, NULL, NULL, &k5_error_blob);
53 if (kret != 0) {
54 DEBUG(2,(__location__ ": Unable to form krb5 error reply\n"));
55 return NT_STATUS_INTERNAL_ERROR;
56 }
57
58 *out = data_blob_talloc(mem_ctx, k5_error_blob.data, k5_error_blob.length);
59 krb5_data_free(&k5_error_blob);
60 if (!out->data) {
61 return NT_STATUS_NO_MEMORY;
62 }
63
64 return NT_STATUS_OK;
65 }
66
67 typedef enum kdc_process_ret (*kdc_process_fn_t)(struct kdc_server *kdc,
68 TALLOC_CTX *mem_ctx,
69 DATA_BLOB *input,
70 DATA_BLOB *reply,
71 struct tsocket_address *peer_addr,
72 struct tsocket_address *my_addr,
73 int datagram);
74
75 /* hold information about one kdc socket */
76 struct kdc_socket {
77 struct kdc_server *kdc;
78 struct tsocket_address *local_address;
79 kdc_process_fn_t process;
80 };
81
82 struct kdc_tcp_call {
83 struct kdc_tcp_connection *kdc_conn;
84 DATA_BLOB in;
85 DATA_BLOB out;
86 uint8_t out_hdr[4];
87 struct iovec out_iov[2];
88 };
89
90 /*
91 state of an open tcp connection
92 */
93 struct kdc_tcp_connection {
94 /* stream connection we belong to */
95 struct stream_connection *conn;
96
97 /* the kdc_server the connection belongs to */
98 struct kdc_socket *kdc_socket;
99
100 struct tstream_context *tstream;
101
102 struct tevent_queue *send_queue;
103 };
104
105
106 static void kdc_tcp_terminate_connection(struct kdc_tcp_connection *kdcconn, const char *reason)
107 {
108 stream_terminate_connection(kdcconn->conn, reason);
109 }
110
111 static void kdc_tcp_recv(struct stream_connection *conn, uint16_t flags)
112 {
113 struct kdc_tcp_connection *kdcconn = talloc_get_type(conn->private_data,
114 struct kdc_tcp_connection);
115 /* this should never be triggered! */
116 kdc_tcp_terminate_connection(kdcconn, "kdc_tcp_recv: called");
117 }
118
119 static void kdc_tcp_send(struct stream_connection *conn, uint16_t flags)
120 {
121 struct kdc_tcp_connection *kdcconn = talloc_get_type(conn->private_data,
122 struct kdc_tcp_connection);
123 /* this should never be triggered! */
124 kdc_tcp_terminate_connection(kdcconn, "kdc_tcp_send: called");
125 }
126
127 /**
128 Wrapper for krb5_kdc_process_krb5_request, converting to/from Samba
129 calling conventions
130 */
131
132 static enum kdc_process_ret kdc_process(struct kdc_server *kdc,
133 TALLOC_CTX *mem_ctx,
134 DATA_BLOB *input,
135 DATA_BLOB *reply,
136 struct tsocket_address *peer_addr,
137 struct tsocket_address *my_addr,
138 int datagram_reply)
139 {
140 int ret;
141 char *pa;
142 struct sockaddr_storage ss;
143 krb5_data k5_reply;
144 krb5_data_zero(&k5_reply);
145
146 krb5_kdc_update_time(NULL);
147
148 ret = tsocket_address_bsd_sockaddr(peer_addr, (struct sockaddr *) &ss,
149 sizeof(struct sockaddr_storage));
150 if (ret < 0) {
151 return KDC_PROCESS_FAILED;
152 }
153 pa = tsocket_address_string(peer_addr, mem_ctx);
154 if (pa == NULL) {
155 return KDC_PROCESS_FAILED;
156 }
157
158 DEBUG(10,("Received KDC packet of length %lu from %s\n",
159 (long)input->length - 4, pa));
160
161 ret = krb5_kdc_process_krb5_request(kdc->smb_krb5_context->krb5_context,
162 kdc->config,
163 input->data, input->length,
164 &k5_reply,
165 pa,
166 (struct sockaddr *) &ss,
167 datagram_reply);
168 if (ret == -1) {
169 *reply = data_blob(NULL, 0);
170 return KDC_PROCESS_FAILED;
171 }
172
173 if (ret == HDB_ERR_NOT_FOUND_HERE) {
174 *reply = data_blob(NULL, 0);
175 return KDC_PROCESS_PROXY;
176 }
177
178 if (k5_reply.length) {
179 *reply = data_blob_talloc(mem_ctx, k5_reply.data, k5_reply.length);
180 krb5_data_free(&k5_reply);
181 } else {
182 *reply = data_blob(NULL, 0);
183 }
184 return KDC_PROCESS_OK;
185 }
186
187 static void kdc_tcp_call_proxy_done(struct tevent_req *subreq);
188 static void kdc_tcp_call_writev_done(struct tevent_req *subreq);
189
190 static void kdc_tcp_call_loop(struct tevent_req *subreq)
191 {
192 struct kdc_tcp_connection *kdc_conn = tevent_req_callback_data(subreq,
193 struct kdc_tcp_connection);
194 struct kdc_tcp_call *call;
195 NTSTATUS status;
196 enum kdc_process_ret ret;
197
198 call = talloc(kdc_conn, struct kdc_tcp_call);
199 if (call == NULL) {
200 kdc_tcp_terminate_connection(kdc_conn, "kdc_tcp_call_loop: "
201 "no memory for kdc_tcp_call");
202 return;
203 }
204 call->kdc_conn = kdc_conn;
205
206 status = tstream_read_pdu_blob_recv(subreq,
207 call,
208 &call->in);
209 TALLOC_FREE(subreq);
210 if (!NT_STATUS_IS_OK(status)) {
211 const char *reason;
212
213 reason = talloc_asprintf(call, "kdc_tcp_call_loop: "
214 "tstream_read_pdu_blob_recv() - %s",
215 nt_errstr(status));
216 if (!reason) {
217 reason = nt_errstr(status);
218 }
219
220 kdc_tcp_terminate_connection(kdc_conn, reason);
221 return;
222 }
223
224 DEBUG(10,("Received krb5 TCP packet of length %lu from %s\n",
225 (long) call->in.length,
226 tsocket_address_string(kdc_conn->conn->remote_address, call)));
227
228 /* skip length header */
229 call->in.data +=4;
230 call->in.length -= 4;
231
232 /* Call krb5 */
233 ret = kdc_conn->kdc_socket->process(kdc_conn->kdc_socket->kdc,
234 call,
235 &call->in,
236 &call->out,
237 kdc_conn->conn->remote_address,
238 kdc_conn->conn->local_address,
239 0 /* Stream */);
240 if (ret == KDC_PROCESS_FAILED) {
241 kdc_tcp_terminate_connection(kdc_conn,
242 "kdc_tcp_call_loop: process function failed");
243 return;
244 }
245
246 if (ret == KDC_PROCESS_PROXY) {
247 uint16_t port;
248
249 if (!kdc_conn->kdc_socket->kdc->am_rodc) {
250 kdc_tcp_terminate_connection(kdc_conn,
251 "kdc_tcp_call_loop: proxying requested when not RODC");
252 return;
253 }
254 port = tsocket_address_inet_port(kdc_conn->conn->local_address);
255
256 subreq = kdc_tcp_proxy_send(call,
257 kdc_conn->conn->event.ctx,
258 kdc_conn->kdc_socket->kdc,
259 port,
260 call->in);
261 if (subreq == NULL) {
262 kdc_tcp_terminate_connection(kdc_conn,
263 "kdc_tcp_call_loop: kdc_tcp_proxy_send failed");
264 return;
265 }
266 tevent_req_set_callback(subreq, kdc_tcp_call_proxy_done, call);
267 return;
268 }
269
270 /* First add the length of the out buffer */
271 RSIVAL(call->out_hdr, 0, call->out.length);
272 call->out_iov[0].iov_base = (char *) call->out_hdr;
273 call->out_iov[0].iov_len = 4;
274
275 call->out_iov[1].iov_base = (char *) call->out.data;
276 call->out_iov[1].iov_len = call->out.length;
277
278 subreq = tstream_writev_queue_send(call,
279 kdc_conn->conn->event.ctx,
280 kdc_conn->tstream,
281 kdc_conn->send_queue,
282 call->out_iov, 2);
283 if (subreq == NULL) {
284 kdc_tcp_terminate_connection(kdc_conn, "kdc_tcp_call_loop: "
285 "no memory for tstream_writev_queue_send");
286 return;
287 }
288 tevent_req_set_callback(subreq, kdc_tcp_call_writev_done, call);
289
290 /*
291 * The krb5 tcp pdu's has the length as 4 byte (initial_read_size),
292 * packet_full_request_u32 provides the pdu length then.
293 */
294 subreq = tstream_read_pdu_blob_send(kdc_conn,
295 kdc_conn->conn->event.ctx,
296 kdc_conn->tstream,
297 4, /* initial_read_size */
298 packet_full_request_u32,
299 kdc_conn);
300 if (subreq == NULL) {
301 kdc_tcp_terminate_connection(kdc_conn, "kdc_tcp_call_loop: "
302 "no memory for tstream_read_pdu_blob_send");
303 return;
304 }
305 tevent_req_set_callback(subreq, kdc_tcp_call_loop, kdc_conn);
306 }
307
308 static void kdc_tcp_call_proxy_done(struct tevent_req *subreq)
309 {
310 struct kdc_tcp_call *call = tevent_req_callback_data(subreq,
311 struct kdc_tcp_call);
312 struct kdc_tcp_connection *kdc_conn = call->kdc_conn;
313 NTSTATUS status;
314
315 status = kdc_tcp_proxy_recv(subreq, call, &call->out);
316 TALLOC_FREE(subreq);
317 if (!NT_STATUS_IS_OK(status)) {
318 /* generate an error packet */
319 status = kdc_proxy_unavailable_error(kdc_conn->kdc_socket->kdc,
320 call, &call->out);
321 }
322
323 if (!NT_STATUS_IS_OK(status)) {
324 const char *reason;
325
326 reason = talloc_asprintf(call, "kdc_tcp_call_proxy_done: "
327 "kdc_proxy_unavailable_error - %s",
328 nt_errstr(status));
329 if (!reason) {
330 reason = "kdc_tcp_call_proxy_done: kdc_proxy_unavailable_error() failed";
331 }
332
333 kdc_tcp_terminate_connection(call->kdc_conn, reason);
334 return;
335 }
336
337 /* First add the length of the out buffer */
338 RSIVAL(call->out_hdr, 0, call->out.length);
339 call->out_iov[0].iov_base = (char *) call->out_hdr;
340 call->out_iov[0].iov_len = 4;
341
342 call->out_iov[1].iov_base = (char *) call->out.data;
343 call->out_iov[1].iov_len = call->out.length;
344
345 subreq = tstream_writev_queue_send(call,
346 kdc_conn->conn->event.ctx,
347 kdc_conn->tstream,
348 kdc_conn->send_queue,
349 call->out_iov, 2);
350 if (subreq == NULL) {
351 kdc_tcp_terminate_connection(kdc_conn, "kdc_tcp_call_loop: "
352 "no memory for tstream_writev_queue_send");
353 return;
354 }
355 tevent_req_set_callback(subreq, kdc_tcp_call_writev_done, call);
356
357 /*
358 * The krb5 tcp pdu's has the length as 4 byte (initial_read_size),
359 * packet_full_request_u32 provides the pdu length then.
360 */
361 subreq = tstream_read_pdu_blob_send(kdc_conn,
362 kdc_conn->conn->event.ctx,
363 kdc_conn->tstream,
364 4, /* initial_read_size */
365 packet_full_request_u32,
366 kdc_conn);
367 if (subreq == NULL) {
368 kdc_tcp_terminate_connection(kdc_conn, "kdc_tcp_call_loop: "
369 "no memory for tstream_read_pdu_blob_send");
370 return;
371 }
372 tevent_req_set_callback(subreq, kdc_tcp_call_loop, kdc_conn);
373 }
374
375 static void kdc_tcp_call_writev_done(struct tevent_req *subreq)
376 {
377 struct kdc_tcp_call *call = tevent_req_callback_data(subreq,
378 struct kdc_tcp_call);
379 int sys_errno;
380 int rc;
381
382 rc = tstream_writev_queue_recv(subreq, &sys_errno);
383 TALLOC_FREE(subreq);
384 if (rc == -1) {
385 const char *reason;
386
387 reason = talloc_asprintf(call, "kdc_tcp_call_writev_done: "
388 "tstream_writev_queue_recv() - %d:%s",
389 sys_errno, strerror(sys_errno));
390 if (!reason) {
391 reason = "kdc_tcp_call_writev_done: tstream_writev_queue_recv() failed";
392 }
393
394 kdc_tcp_terminate_connection(call->kdc_conn, reason);
395 return;
396 }
397
398 /* We don't care about errors */
399
400 talloc_free(call);
401 }
402
403 /*
404 called when we get a new connection
405 */
406 static void kdc_tcp_accept(struct stream_connection *conn)
407 {
408 struct kdc_socket *kdc_socket;
409 struct kdc_tcp_connection *kdc_conn;
410 struct tevent_req *subreq;
411 int rc;
412
413 kdc_conn = talloc_zero(conn, struct kdc_tcp_connection);
414 if (kdc_conn == NULL) {
415 stream_terminate_connection(conn,
416 "kdc_tcp_accept: out of memory");
417 return;
418 }
419
420 kdc_conn->send_queue = tevent_queue_create(conn, "kdc_tcp_accept");
421 if (kdc_conn->send_queue == NULL) {
422 stream_terminate_connection(conn,
423 "kdc_tcp_accept: out of memory");
424 return;
425 }
426
427 kdc_socket = talloc_get_type(conn->private_data, struct kdc_socket);
428
429 TALLOC_FREE(conn->event.fde);
430
431 rc = tstream_bsd_existing_socket(kdc_conn,
432 socket_get_fd(conn->socket),
433 &kdc_conn->tstream);
434 if (rc < 0) {
435 stream_terminate_connection(conn,
436 "kdc_tcp_accept: out of memory");
437 return;
438 }
439
440 kdc_conn->conn = conn;
441 kdc_conn->kdc_socket = kdc_socket;
442 conn->private_data = kdc_conn;
443
444 /*
445 * The krb5 tcp pdu's has the length as 4 byte (initial_read_size),
446 * packet_full_request_u32 provides the pdu length then.
447 */
448 subreq = tstream_read_pdu_blob_send(kdc_conn,
449 kdc_conn->conn->event.ctx,
450 kdc_conn->tstream,
451 4, /* initial_read_size */
452 packet_full_request_u32,
453 kdc_conn);
454 if (subreq == NULL) {
455 kdc_tcp_terminate_connection(kdc_conn, "kdc_tcp_accept: "
456 "no memory for tstream_read_pdu_blob_send");
457 return;
458 }
459 tevent_req_set_callback(subreq, kdc_tcp_call_loop, kdc_conn);
460 }
461
462 static const struct stream_server_ops kdc_tcp_stream_ops = {
463 .name = "kdc_tcp",
464 .accept_connection = kdc_tcp_accept,
465 .recv_handler = kdc_tcp_recv,
466 .send_handler = kdc_tcp_send
467 };
468
469 /* hold information about one kdc/kpasswd udp socket */
470 struct kdc_udp_socket {
471 struct kdc_socket *kdc_socket;
472 struct tdgram_context *dgram;
473 struct tevent_queue *send_queue;
474 };
475
476 struct kdc_udp_call {
477 struct kdc_udp_socket *sock;
478 struct tsocket_address *src;
479 DATA_BLOB in;
480 DATA_BLOB out;
481 };
482
483 static void kdc_udp_call_proxy_done(struct tevent_req *subreq);
484 static void kdc_udp_call_sendto_done(struct tevent_req *subreq);
485
486 static void kdc_udp_call_loop(struct tevent_req *subreq)
487 {
488 struct kdc_udp_socket *sock = tevent_req_callback_data(subreq,
489 struct kdc_udp_socket);
490 struct kdc_udp_call *call;
491 uint8_t *buf;
492 ssize_t len;
493 int sys_errno;
494 enum kdc_process_ret ret;
495
496 call = talloc(sock, struct kdc_udp_call);
497 if (call == NULL) {
498 talloc_free(call);
499 goto done;
500 }
501 call->sock = sock;
502
503 len = tdgram_recvfrom_recv(subreq, &sys_errno,
504 call, &buf, &call->src);
505 TALLOC_FREE(subreq);
506 if (len == -1) {
507 talloc_free(call);
508 goto done;
509 }
510
511 call->in.data = buf;
512 call->in.length = len;
513
514 DEBUG(10,("Received krb5 UDP packet of length %lu from %s\n",
515 (long)call->in.length,
516 tsocket_address_string(call->src, call)));
517
518 /* Call krb5 */
519 ret = sock->kdc_socket->process(sock->kdc_socket->kdc,
520 call,
521 &call->in,
522 &call->out,
523 call->src,
524 sock->kdc_socket->local_address,
525 1 /* Datagram */);
526 if (ret == KDC_PROCESS_FAILED) {
527 talloc_free(call);
528 goto done;
529 }
530
531 if (ret == KDC_PROCESS_PROXY) {
532 uint16_t port;
533
534 if (!sock->kdc_socket->kdc->am_rodc) {
535 DEBUG(0,("kdc_udp_call_loop: proxying requested when not RODC"));
536 talloc_free(call);
537 goto done;
538 }
539
540 port = tsocket_address_inet_port(sock->kdc_socket->local_address);
541
542 subreq = kdc_udp_proxy_send(call,
543 sock->kdc_socket->kdc->task->event_ctx,
544 sock->kdc_socket->kdc,
545 port,
546 call->in);
547 if (subreq == NULL) {
548 talloc_free(call);
549 goto done;
550 }
551 tevent_req_set_callback(subreq, kdc_udp_call_proxy_done, call);
552 goto done;
553 }
554
555 subreq = tdgram_sendto_queue_send(call,
556 sock->kdc_socket->kdc->task->event_ctx,
557 sock->dgram,
558 sock->send_queue,
559 call->out.data,
560 call->out.length,
561 call->src);
562 if (subreq == NULL) {
563 talloc_free(call);
564 goto done;
565 }
566 tevent_req_set_callback(subreq, kdc_udp_call_sendto_done, call);
567
568 done:
569 subreq = tdgram_recvfrom_send(sock,
570 sock->kdc_socket->kdc->task->event_ctx,
571 sock->dgram);
572 if (subreq == NULL) {
573 task_server_terminate(sock->kdc_socket->kdc->task,
574 "no memory for tdgram_recvfrom_send",
575 true);
576 return;
577 }
578 tevent_req_set_callback(subreq, kdc_udp_call_loop, sock);
579 }
580
581 static void kdc_udp_call_proxy_done(struct tevent_req *subreq)
582 {
583 struct kdc_udp_call *call =
584 tevent_req_callback_data(subreq,
585 struct kdc_udp_call);
586 NTSTATUS status;
587
588 status = kdc_udp_proxy_recv(subreq, call, &call->out);
589 TALLOC_FREE(subreq);
590 if (!NT_STATUS_IS_OK(status)) {
591 /* generate an error packet */
592 status = kdc_proxy_unavailable_error(call->sock->kdc_socket->kdc,
593 call, &call->out);
594 }
595
596 if (!NT_STATUS_IS_OK(status)) {
597 talloc_free(call);
598 return;
599 }
600
601 subreq = tdgram_sendto_queue_send(call,
602 call->sock->kdc_socket->kdc->task->event_ctx,
603 call->sock->dgram,
604 call->sock->send_queue,
605 call->out.data,
606 call->out.length,
607 call->src);
608 if (subreq == NULL) {
609 talloc_free(call);
610 return;
611 }
612
613 tevent_req_set_callback(subreq, kdc_udp_call_sendto_done, call);
614 }
615
616 static void kdc_udp_call_sendto_done(struct tevent_req *subreq)
617 {
618 struct kdc_udp_call *call = tevent_req_callback_data(subreq,
619 struct kdc_udp_call);
620 int sys_errno;
621
622 tdgram_sendto_queue_recv(subreq, &sys_errno);
623
624 /* We don't care about errors */
625
626 talloc_free(call);
627 }
628
629 /*
630 start listening on the given address
631 */
632 static NTSTATUS kdc_add_socket(struct kdc_server *kdc,
633 const struct model_ops *model_ops,
634 const char *name,
635 const char *address,
636 uint16_t port,
637 kdc_process_fn_t process,
638 bool udp_only)
639 {
640 struct kdc_socket *kdc_socket;
641 struct kdc_udp_socket *kdc_udp_socket;
642 struct tevent_req *udpsubreq;
643 NTSTATUS status;
644 int ret;
645
646 kdc_socket = talloc(kdc, struct kdc_socket);
647 NT_STATUS_HAVE_NO_MEMORY(kdc_socket);
648
649 kdc_socket->kdc = kdc;
650 kdc_socket->process = process;
651
652 ret = tsocket_address_inet_from_strings(kdc_socket, "ip",
653 address, port,
654 &kdc_socket->local_address);
655 if (ret != 0) {
656 status = map_nt_error_from_unix_common(errno);
657 return status;
658 }
659
660 if (!udp_only) {
661 status = stream_setup_socket(kdc->task,
662 kdc->task->event_ctx,
663 kdc->task->lp_ctx,
664 model_ops,
665 &kdc_tcp_stream_ops,
666 "ip", address, &port,
667 lpcfg_socket_options(kdc->task->lp_ctx),
668 kdc_socket);
669 if (!NT_STATUS_IS_OK(status)) {
670 DEBUG(0,("Failed to bind to %s:%u TCP - %s\n",
671 address, port, nt_errstr(status)));
672 talloc_free(kdc_socket);
673 return status;
674 }
675 }
676
677 kdc_udp_socket = talloc(kdc_socket, struct kdc_udp_socket);
678 NT_STATUS_HAVE_NO_MEMORY(kdc_udp_socket);
679
680 kdc_udp_socket->kdc_socket = kdc_socket;
681
682 ret = tdgram_inet_udp_socket(kdc_socket->local_address,
683 NULL,
684 kdc_udp_socket,
685 &kdc_udp_socket->dgram);
686 if (ret != 0) {
687 status = map_nt_error_from_unix_common(errno);
688 DEBUG(0,("Failed to bind to %s:%u UDP - %s\n",
689 address, port, nt_errstr(status)));
690 return status;
691 }
692
693 kdc_udp_socket->send_queue = tevent_queue_create(kdc_udp_socket,
694 "kdc_udp_send_queue");
695 NT_STATUS_HAVE_NO_MEMORY(kdc_udp_socket->send_queue);
696
697 udpsubreq = tdgram_recvfrom_send(kdc_udp_socket,
698 kdc->task->event_ctx,
699 kdc_udp_socket->dgram);
700 NT_STATUS_HAVE_NO_MEMORY(udpsubreq);
701 tevent_req_set_callback(udpsubreq, kdc_udp_call_loop, kdc_udp_socket);
702
703 return NT_STATUS_OK;
704 }
705
706
707 /*
708 setup our listening sockets on the configured network interfaces
709 */
710 static NTSTATUS kdc_startup_interfaces(struct kdc_server *kdc, struct loadparm_context *lp_ctx,
711 struct interface *ifaces)
712 {
713 const struct model_ops *model_ops;
714 int num_interfaces;
715 TALLOC_CTX *tmp_ctx = talloc_new(kdc);
716 NTSTATUS status;
717 int i;
718 uint16_t kdc_port = lpcfg_krb5_port(lp_ctx);
719 uint16_t kpasswd_port = lpcfg_kpasswd_port(lp_ctx);
720 bool done_wildcard = false;
721
722 /* within the kdc task we want to be a single process, so
723 ask for the single process model ops and pass these to the
724 stream_setup_socket() call. */
725 model_ops = process_model_startup("single");
726 if (!model_ops) {
727 DEBUG(0,("Can't find 'single' process model_ops\n"));
728 return NT_STATUS_INTERNAL_ERROR;
729 }
730
731 num_interfaces = iface_list_count(ifaces);
732
733 /* if we are allowing incoming packets from any address, then
734 we need to bind to the wildcard address */
735 if (!lpcfg_bind_interfaces_only(lp_ctx)) {
736 int num_binds = 0;
737 char **wcard = iface_list_wildcard(kdc);
738 NT_STATUS_HAVE_NO_MEMORY(wcard);
739 for (i=0; wcard[i]; i++) {
740 if (kdc_port) {
741 status = kdc_add_socket(kdc, model_ops,
742 "kdc", wcard[i], kdc_port,
743 kdc_process, false);
744 if (NT_STATUS_IS_OK(status)) {
745 num_binds++;
746 }
747 }
748
749 if (kpasswd_port) {
750 status = kdc_add_socket(kdc, model_ops,
751 "kpasswd", wcard[i], kpasswd_port,
752 kpasswdd_process, false);
753 if (NT_STATUS_IS_OK(status)) {
754 num_binds++;
755 }
756 }
757 }
758 talloc_free(wcard);
759 if (num_binds == 0) {
760 return NT_STATUS_INVALID_PARAMETER_MIX;
761 }
762 done_wildcard = true;
763 }
764
765 for (i=0; i<num_interfaces; i++) {
766 const char *address = talloc_strdup(tmp_ctx, iface_list_n_ip(ifaces, i));
767
768 if (kdc_port) {
769 status = kdc_add_socket(kdc, model_ops,
770 "kdc", address, kdc_port,
771 kdc_process, done_wildcard);
772 NT_STATUS_NOT_OK_RETURN(status);
773 }
774
775 if (kpasswd_port) {
776 status = kdc_add_socket(kdc, model_ops,
777 "kpasswd", address, kpasswd_port,
778 kpasswdd_process, done_wildcard);
779 NT_STATUS_NOT_OK_RETURN(status);
780 }
781 }
782
783 talloc_free(tmp_ctx);
784
785 return NT_STATUS_OK;
786 }
787
788 static NTSTATUS kdc_check_generic_kerberos(struct irpc_message *msg,
789 struct kdc_check_generic_kerberos *r)
790 {
791 struct PAC_Validate pac_validate;
792 DATA_BLOB srv_sig;
793 struct PAC_SIGNATURE_DATA kdc_sig;
794 struct kdc_server *kdc = talloc_get_type(msg->private_data, struct kdc_server);
795 enum ndr_err_code ndr_err;
796 int ret;
797 hdb_entry_ex ent;
798 krb5_principal principal;
799
800 /* There is no reply to this request */
801 r->out.generic_reply = data_blob(NULL, 0);
802
803 ndr_err = ndr_pull_struct_blob(&r->in.generic_request, msg, &pac_validate,
804 (ndr_pull_flags_fn_t)ndr_pull_PAC_Validate);
805 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
806 return NT_STATUS_INVALID_PARAMETER;
807 }
808
809 if (pac_validate.MessageType != NETLOGON_GENERIC_KRB5_PAC_VALIDATE) {
810 /* We don't implement any other message types - such as certificate validation - yet */
811 return NT_STATUS_INVALID_PARAMETER;
812 }
813
814 if (pac_validate.ChecksumAndSignature.length != (pac_validate.ChecksumLength + pac_validate.SignatureLength)
815 || pac_validate.ChecksumAndSignature.length < pac_validate.ChecksumLength
816 || pac_validate.ChecksumAndSignature.length < pac_validate.SignatureLength ) {
817 return NT_STATUS_INVALID_PARAMETER;
818 }
819
820 srv_sig = data_blob_const(pac_validate.ChecksumAndSignature.data,
821 pac_validate.ChecksumLength);
822
823 ret = krb5_make_principal(kdc->smb_krb5_context->krb5_context, &principal,
824 lpcfg_realm(kdc->task->lp_ctx),
825 "krbtgt", lpcfg_realm(kdc->task->lp_ctx),
826 NULL);
827
828 if (ret != 0) {
829 return NT_STATUS_NO_MEMORY;
830 }
831
832 ret = kdc->config->db[0]->hdb_fetch_kvno(kdc->smb_krb5_context->krb5_context,
833 kdc->config->db[0],
834 principal,
835 HDB_F_GET_KRBTGT | HDB_F_DECRYPT,
836 0,
837 &ent);
838
839 if (ret != 0) {
840 hdb_free_entry(kdc->smb_krb5_context->krb5_context, &ent);
841 krb5_free_principal(kdc->smb_krb5_context->krb5_context, principal);
842
843 return NT_STATUS_LOGON_FAILURE;
844 }
845
846 kdc_sig.type = pac_validate.SignatureType;
847 kdc_sig.signature = data_blob_const(&pac_validate.ChecksumAndSignature.data[pac_validate.ChecksumLength],
848 pac_validate.SignatureLength);
849
850 ret = kdc_check_pac(kdc->smb_krb5_context->krb5_context, srv_sig, &kdc_sig, &ent);
851
852 hdb_free_entry(kdc->smb_krb5_context->krb5_context, &ent);
853 krb5_free_principal(kdc->smb_krb5_context->krb5_context, principal);
854
855 if (ret != 0) {
856 return NT_STATUS_LOGON_FAILURE;
857 }
858
859 return NT_STATUS_OK;
860 }
861
862
863 /*
864 startup the kdc task
865 */
866 static void kdc_task_init(struct task_server *task)
867 {
868 struct kdc_server *kdc;
869 NTSTATUS status;
870 krb5_error_code ret;
871 struct interface *ifaces;
872 int ldb_ret;
873
874 switch (lpcfg_server_role(task->lp_ctx)) {
875 case ROLE_STANDALONE:
876 task_server_terminate(task, "kdc: no KDC required in standalone configuration", false);
877 return;
878 case ROLE_DOMAIN_MEMBER:
879 task_server_terminate(task, "kdc: no KDC required in member server configuration", false);
880 return;
881 case ROLE_DOMAIN_PDC:
882 case ROLE_DOMAIN_BDC:
883 task_server_terminate(task, "Cannot start KDC as a 'classic Samba' DC", true);
884 return;
885 case ROLE_ACTIVE_DIRECTORY_DC:
886 /* Yes, we want a KDC */
887 break;
888 }
889
890 load_interface_list(task, task->lp_ctx, &ifaces);
891
892 if (iface_list_count(ifaces) == 0) {
893 task_server_terminate(task, "kdc: no network interfaces configured", false);
894 return;
895 }
896
897 task_server_set_title(task, "task[kdc]");
898
899 kdc = talloc_zero(task, struct kdc_server);
900 if (kdc == NULL) {
901 task_server_terminate(task, "kdc: out of memory", true);
902 return;
903 }
904
905 kdc->task = task;
906
907
908 /* get a samdb connection */
909 kdc->samdb = samdb_connect(kdc, kdc->task->event_ctx, kdc->task->lp_ctx,
910 system_session(kdc->task->lp_ctx), 0);
911 if (!kdc->samdb) {
912 DEBUG(1,("kdc_task_init: unable to connect to samdb\n"));
913 task_server_terminate(task, "kdc: krb5_init_context samdb connect failed", true);
914 return;
915 }
916
917 ldb_ret = samdb_rodc(kdc->samdb, &kdc->am_rodc);
918 if (ldb_ret != LDB_SUCCESS) {
919 DEBUG(1, ("kdc_task_init: Cannot determine if we are an RODC: %s\n",
920 ldb_errstring(kdc->samdb)));
921 task_server_terminate(task, "kdc: krb5_init_context samdb RODC connect failed", true);
922 return;
923 }
924
925 kdc->proxy_timeout = lpcfg_parm_int(kdc->task->lp_ctx, NULL, "kdc", "proxy timeout", 5);
926
927 initialize_krb5_error_table();
928
929 ret = smb_krb5_init_context(kdc, task->lp_ctx, &kdc->smb_krb5_context);
930 if (ret) {
931 DEBUG(1,("kdc_task_init: krb5_init_context failed (%s)\n",
932 error_message(ret)));
933 task_server_terminate(task, "kdc: krb5_init_context failed", true);
934 return;
935 }
936
937 krb5_add_et_list(kdc->smb_krb5_context->krb5_context, initialize_hdb_error_table_r);
938
939 ret = krb5_kdc_get_config(kdc->smb_krb5_context->krb5_context,
940 &kdc->config);
941 if(ret) {
942 task_server_terminate(task, "kdc: failed to get KDC configuration", true);
943 return;
944 }
945
946 kdc->config->logf = (krb5_log_facility *)kdc->smb_krb5_context->pvt_log_data;
947 kdc->config->db = talloc(kdc, struct HDB *);
948 if (!kdc->config->db) {
949 task_server_terminate(task, "kdc: out of memory", true);
950 return;
951 }
952 kdc->config->num_db = 1;
953
954 /*
955 * This restores the behavior before
956 * commit 255e3e18e00f717d99f3bc57c8a8895ff624f3c3
957 * s4:heimdal: import lorikeet-heimdal-201107150856
958 * (commit 48936803fae4a2fb362c79365d31f420c917b85b)
959 *
960 * as_use_strongest_session_key,preauth_use_strongest_session_key
961 * and tgs_use_strongest_session_key are input to the
962 * _kdc_find_etype() function. The old bahavior is in
963 * the use_strongest_session_key=FALSE code path.
964 * (The only remaining difference in _kdc_find_etype()
965 * is the is_preauth parameter.)
966 *
967 * The old behavior in the _kdc_get_preferred_key()
968 * function is use_strongest_server_key=TRUE.
969 */
970 kdc->config->as_use_strongest_session_key = false;
971 kdc->config->preauth_use_strongest_session_key = false;
972 kdc->config->tgs_use_strongest_session_key = false;
973 kdc->config->use_strongest_server_key = true;
974
975 /* Register hdb-samba4 hooks for use as a keytab */
976
977 kdc->base_ctx = talloc_zero(kdc, struct samba_kdc_base_context);
978 if (!kdc->base_ctx) {
979 task_server_terminate(task, "kdc: out of memory", true);
980 return;
981 }
982
983 kdc->base_ctx->ev_ctx = task->event_ctx;
984 kdc->base_ctx->lp_ctx = task->lp_ctx;
985
986 status = hdb_samba4_create_kdc(kdc->base_ctx,
987 kdc->smb_krb5_context->krb5_context,
988 &kdc->config->db[0]);
989 if (!NT_STATUS_IS_OK(status)) {
990 task_server_terminate(task, "kdc: hdb_samba4_create_kdc (setup KDC database) failed", true);
991 return;
992 }
993
994 ret = krb5_plugin_register(kdc->smb_krb5_context->krb5_context,
995 PLUGIN_TYPE_DATA, "hdb",
996 &hdb_samba4_interface);
997 if(ret) {
998 task_server_terminate(task, "kdc: failed to register hdb plugin", true);
999 return;
1000 }
1001
1002 ret = krb5_kt_register(kdc->smb_krb5_context->krb5_context, &hdb_kt_ops);
1003 if(ret) {
1004 task_server_terminate(task, "kdc: failed to register keytab plugin", true);
1005 return;
1006 }
1007
1008 /* Register WinDC hooks */
1009 ret = krb5_plugin_register(kdc->smb_krb5_context->krb5_context,
1010 PLUGIN_TYPE_DATA, "windc",
1011 &windc_plugin_table);
1012 if(ret) {
1013 task_server_terminate(task, "kdc: failed to register windc plugin", true);
1014 return;
1015 }
1016
1017 ret = krb5_kdc_windc_init(kdc->smb_krb5_context->krb5_context);
1018
1019 if(ret) {
1020 task_server_terminate(task, "kdc: failed to init windc plugin", true);
1021 return;
1022 }
1023
1024 ret = krb5_kdc_pkinit_config(kdc->smb_krb5_context->krb5_context, kdc->config);
1025
1026 if(ret) {
1027 task_server_terminate(task, "kdc: failed to init kdc pkinit subsystem", true);
1028 return;
1029 }
1030
1031 /* start listening on the configured network interfaces */
1032 status = kdc_startup_interfaces(kdc, task->lp_ctx, ifaces);
1033 if (!NT_STATUS_IS_OK(status)) {
1034 task_server_terminate(task, "kdc failed to setup interfaces", true);
1035 return;
1036 }
1037
1038 status = IRPC_REGISTER(task->msg_ctx, irpc, KDC_CHECK_GENERIC_KERBEROS,
1039 kdc_check_generic_kerberos, kdc);
1040 if (!NT_STATUS_IS_OK(status)) {
1041 task_server_terminate(task, "kdc failed to setup monitoring", true);
1042 return;
1043 }
1044
1045 irpc_add_name(task->msg_ctx, "kdc_server");
1046 }
1047
1048
1049 /* called at smbd startup - register ourselves as a server service */
1050 NTSTATUS server_service_kdc_init(void)
1051 {
1052 return register_server_service("kdc", kdc_task_init);
1053 }
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