2 Unix SMB/CIFS implementation.
6 Copyright (C) Andrew Bartlett <abartlet@samba.org> 2005
7 Copyright (C) Andrew Tridgell 2005
8 Copyright (C) Stefan Metzmacher 2005
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.
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.
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/>.
25 #include "smbd/service_task.h"
26 #include "smbd/service.h"
27 #include "smbd/service_stream.h"
28 #include "smbd/process_model.h"
29 #include "lib/events/events.h"
30 #include "lib/socket/socket.h"
32 #include "system/network.h"
33 #include "lib/util/dlinklist.h"
34 #include "lib/messaging/irpc.h"
35 #include "lib/stream/packet.h"
36 #include "librpc/gen_ndr/samr.h"
37 #include "lib/socket/netif.h"
38 #include "heimdal/kdc/windc_plugin.h"
39 #include "heimdal/lib/krb5/krb5_locl.h"
40 #include "heimdal/kdc/kdc_locl.h"
41 #include "param/param.h"
44 /* Disgusting hack to get a mem_ctx into the hdb plugin, when used as a keytab */
45 TALLOC_CTX *kdc_mem_ctx;
47 /* hold all the info needed to send a reply */
49 struct kdc_reply *next, *prev;
50 struct socket_address *dest;
54 typedef BOOL (*kdc_process_fn_t)(struct kdc_server *kdc,
58 struct socket_address *peer_addr,
59 struct socket_address *my_addr,
62 /* hold information about one kdc socket */
64 struct socket_context *sock;
65 struct kdc_server *kdc;
68 /* a queue of outgoing replies that have been deferred */
69 struct kdc_reply *send_queue;
71 kdc_process_fn_t process;
74 state of an open tcp connection
76 struct kdc_tcp_connection {
77 /* stream connection we belong to */
78 struct stream_connection *conn;
80 /* the kdc_server the connection belongs to */
81 struct kdc_server *kdc;
83 struct packet_context *packet;
85 kdc_process_fn_t process;
89 handle fd send events on a KDC socket
91 static void kdc_send_handler(struct kdc_socket *kdc_socket)
93 while (kdc_socket->send_queue) {
94 struct kdc_reply *rep = kdc_socket->send_queue;
98 status = socket_sendto(kdc_socket->sock, &rep->packet, &sendlen,
100 if (NT_STATUS_EQUAL(status, STATUS_MORE_ENTRIES)) {
103 if (NT_STATUS_EQUAL(status, NT_STATUS_INVALID_BUFFER_SIZE)) {
104 /* Replace with a krb err, response to big */
107 DLIST_REMOVE(kdc_socket->send_queue, rep);
111 if (kdc_socket->send_queue == NULL) {
112 EVENT_FD_NOT_WRITEABLE(kdc_socket->fde);
118 handle fd recv events on a KDC socket
120 static void kdc_recv_handler(struct kdc_socket *kdc_socket)
123 TALLOC_CTX *tmp_ctx = talloc_new(kdc_socket);
125 struct kdc_reply *rep;
128 struct socket_address *src;
129 struct socket_address *my_addr;
132 status = socket_pending(kdc_socket->sock, &dsize);
133 if (!NT_STATUS_IS_OK(status)) {
134 talloc_free(tmp_ctx);
138 blob = data_blob_talloc(tmp_ctx, NULL, dsize);
139 if (blob.data == NULL) {
140 /* hope this is a temporary low memory condition */
141 talloc_free(tmp_ctx);
145 status = socket_recvfrom(kdc_socket->sock, blob.data, blob.length, &nread,
147 if (!NT_STATUS_IS_OK(status)) {
148 talloc_free(tmp_ctx);
153 DEBUG(10,("Received krb5 UDP packet of length %lu from %s:%u\n",
154 (long)blob.length, src->addr, (uint16_t)src->port));
156 my_addr = socket_get_my_addr(kdc_socket->sock, tmp_ctx);
158 talloc_free(tmp_ctx);
164 ret = kdc_socket->process(kdc_socket->kdc,
171 talloc_free(tmp_ctx);
175 /* queue a pending reply */
176 rep = talloc(kdc_socket, struct kdc_reply);
178 talloc_free(tmp_ctx);
181 rep->dest = talloc_steal(rep, src);
183 talloc_steal(rep, reply.data);
185 if (rep->packet.data == NULL) {
187 talloc_free(tmp_ctx);
191 DLIST_ADD_END(kdc_socket->send_queue, rep, struct kdc_reply *);
192 EVENT_FD_WRITEABLE(kdc_socket->fde);
193 talloc_free(tmp_ctx);
197 handle fd events on a KDC socket
199 static void kdc_socket_handler(struct event_context *ev, struct fd_event *fde,
200 uint16_t flags, void *private)
202 struct kdc_socket *kdc_socket = talloc_get_type(private, struct kdc_socket);
203 if (flags & EVENT_FD_WRITE) {
204 kdc_send_handler(kdc_socket);
206 if (flags & EVENT_FD_READ) {
207 kdc_recv_handler(kdc_socket);
211 static void kdc_tcp_terminate_connection(struct kdc_tcp_connection *kdcconn, const char *reason)
213 stream_terminate_connection(kdcconn->conn, reason);
217 receive a full packet on a KDC connection
219 static NTSTATUS kdc_tcp_recv(void *private, DATA_BLOB blob)
221 struct kdc_tcp_connection *kdcconn = talloc_get_type(private,
222 struct kdc_tcp_connection);
223 NTSTATUS status = NT_STATUS_UNSUCCESSFUL;
224 TALLOC_CTX *tmp_ctx = talloc_new(kdcconn);
226 DATA_BLOB input, reply;
227 struct socket_address *src_addr;
228 struct socket_address *my_addr;
230 talloc_steal(tmp_ctx, blob.data);
232 src_addr = socket_get_peer_addr(kdcconn->conn->socket, tmp_ctx);
234 talloc_free(tmp_ctx);
235 return NT_STATUS_NO_MEMORY;
238 my_addr = socket_get_my_addr(kdcconn->conn->socket, tmp_ctx);
240 talloc_free(tmp_ctx);
241 return NT_STATUS_NO_MEMORY;
245 input = data_blob_const(blob.data + 4, blob.length - 4);
247 ret = kdcconn->process(kdcconn->kdc,
253 0 /* Not datagram */);
255 talloc_free(tmp_ctx);
256 return NT_STATUS_INTERNAL_ERROR;
259 /* and now encode the reply */
260 blob = data_blob_talloc(kdcconn, NULL, reply.length + 4);
262 talloc_free(tmp_ctx);
263 return NT_STATUS_NO_MEMORY;
266 RSIVAL(blob.data, 0, reply.length);
267 memcpy(blob.data + 4, reply.data, reply.length);
269 status = packet_send(kdcconn->packet, blob);
270 if (!NT_STATUS_IS_OK(status)) {
271 talloc_free(tmp_ctx);
275 /* the call isn't needed any more */
276 talloc_free(tmp_ctx);
281 receive some data on a KDC connection
283 static void kdc_tcp_recv_handler(struct stream_connection *conn, uint16_t flags)
285 struct kdc_tcp_connection *kdcconn = talloc_get_type(conn->private,
286 struct kdc_tcp_connection);
287 packet_recv(kdcconn->packet);
291 called on a tcp recv error
293 static void kdc_tcp_recv_error(void *private, NTSTATUS status)
295 struct kdc_tcp_connection *kdcconn = talloc_get_type(private, struct kdc_tcp_connection);
296 kdc_tcp_terminate_connection(kdcconn, nt_errstr(status));
300 called when we can write to a connection
302 static void kdc_tcp_send(struct stream_connection *conn, uint16_t flags)
304 struct kdc_tcp_connection *kdcconn = talloc_get_type(conn->private,
305 struct kdc_tcp_connection);
306 packet_queue_run(kdcconn->packet);
310 Wrapper for krb5_kdc_process_krb5_request, converting to/from Samba
314 static BOOL kdc_process(struct kdc_server *kdc,
318 struct socket_address *peer_addr,
319 struct socket_address *my_addr,
324 krb5_data_zero(&k5_reply);
326 krb5_kdc_update_time(NULL);
328 DEBUG(10,("Received KDC packet of length %lu from %s:%d\n",
329 (long)input->length - 4, peer_addr->addr, peer_addr->port));
331 ret = krb5_kdc_process_krb5_request(kdc->smb_krb5_context->krb5_context,
333 input->data, input->length,
339 *reply = data_blob(NULL, 0);
342 if (k5_reply.length) {
343 *reply = data_blob_talloc(mem_ctx, k5_reply.data, k5_reply.length);
344 krb5_free_data_contents(kdc->smb_krb5_context->krb5_context, &k5_reply);
346 *reply = data_blob(NULL, 0);
352 called when we get a new connection
354 static void kdc_tcp_generic_accept(struct stream_connection *conn, kdc_process_fn_t process_fn)
356 struct kdc_server *kdc = talloc_get_type(conn->private, struct kdc_server);
357 struct kdc_tcp_connection *kdcconn;
359 kdcconn = talloc_zero(conn, struct kdc_tcp_connection);
361 stream_terminate_connection(conn, "kdc_tcp_accept: out of memory");
364 kdcconn->conn = conn;
366 kdcconn->process = process_fn;
367 conn->private = kdcconn;
369 kdcconn->packet = packet_init(kdcconn);
370 if (kdcconn->packet == NULL) {
371 kdc_tcp_terminate_connection(kdcconn, "kdc_tcp_accept: out of memory");
374 packet_set_private(kdcconn->packet, kdcconn);
375 packet_set_socket(kdcconn->packet, conn->socket);
376 packet_set_callback(kdcconn->packet, kdc_tcp_recv);
377 packet_set_full_request(kdcconn->packet, packet_full_request_u32);
378 packet_set_error_handler(kdcconn->packet, kdc_tcp_recv_error);
379 packet_set_event_context(kdcconn->packet, conn->event.ctx);
380 packet_set_fde(kdcconn->packet, conn->event.fde);
381 packet_set_serialise(kdcconn->packet);
384 static void kdc_tcp_accept(struct stream_connection *conn)
386 kdc_tcp_generic_accept(conn, kdc_process);
389 static const struct stream_server_ops kdc_tcp_stream_ops = {
391 .accept_connection = kdc_tcp_accept,
392 .recv_handler = kdc_tcp_recv_handler,
393 .send_handler = kdc_tcp_send
396 static void kpasswdd_tcp_accept(struct stream_connection *conn)
398 kdc_tcp_generic_accept(conn, kpasswdd_process);
401 static const struct stream_server_ops kpasswdd_tcp_stream_ops = {
402 .name = "kpasswdd_tcp",
403 .accept_connection = kpasswdd_tcp_accept,
404 .recv_handler = kdc_tcp_recv_handler,
405 .send_handler = kdc_tcp_send
409 start listening on the given address
411 static NTSTATUS kdc_add_socket(struct kdc_server *kdc, const char *address,
412 uint16_t kdc_port, uint16_t kpasswd_port)
414 const struct model_ops *model_ops;
415 struct kdc_socket *kdc_socket;
416 struct kdc_socket *kpasswd_socket;
417 struct socket_address *kdc_address, *kpasswd_address;
420 kdc_socket = talloc(kdc, struct kdc_socket);
421 NT_STATUS_HAVE_NO_MEMORY(kdc_socket);
423 kpasswd_socket = talloc(kdc, struct kdc_socket);
424 NT_STATUS_HAVE_NO_MEMORY(kpasswd_socket);
426 status = socket_create("ip", SOCKET_TYPE_DGRAM, &kdc_socket->sock, 0);
427 if (!NT_STATUS_IS_OK(status)) {
428 talloc_free(kdc_socket);
432 status = socket_create("ip", SOCKET_TYPE_DGRAM, &kpasswd_socket->sock, 0);
433 if (!NT_STATUS_IS_OK(status)) {
434 talloc_free(kpasswd_socket);
438 kdc_socket->kdc = kdc;
439 kdc_socket->send_queue = NULL;
440 kdc_socket->process = kdc_process;
442 talloc_steal(kdc_socket, kdc_socket->sock);
444 kdc_socket->fde = event_add_fd(kdc->task->event_ctx, kdc,
445 socket_get_fd(kdc_socket->sock), EVENT_FD_READ,
446 kdc_socket_handler, kdc_socket);
448 kdc_address = socket_address_from_strings(kdc_socket, kdc_socket->sock->backend_name,
450 NT_STATUS_HAVE_NO_MEMORY(kdc_address);
452 status = socket_listen(kdc_socket->sock, kdc_address, 0, 0);
453 if (!NT_STATUS_IS_OK(status)) {
454 DEBUG(0,("Failed to bind to %s:%d UDP for kdc - %s\n",
455 address, kdc_port, nt_errstr(status)));
456 talloc_free(kdc_socket);
460 kpasswd_socket->kdc = kdc;
461 kpasswd_socket->send_queue = NULL;
462 kpasswd_socket->process = kpasswdd_process;
464 talloc_steal(kpasswd_socket, kpasswd_socket->sock);
466 kpasswd_socket->fde = event_add_fd(kdc->task->event_ctx, kdc,
467 socket_get_fd(kpasswd_socket->sock), EVENT_FD_READ,
468 kdc_socket_handler, kpasswd_socket);
470 kpasswd_address = socket_address_from_strings(kpasswd_socket, kpasswd_socket->sock->backend_name,
471 address, kpasswd_port);
472 NT_STATUS_HAVE_NO_MEMORY(kpasswd_address);
474 status = socket_listen(kpasswd_socket->sock, kpasswd_address, 0, 0);
475 if (!NT_STATUS_IS_OK(status)) {
476 DEBUG(0,("Failed to bind to %s:%d UDP for kpasswd - %s\n",
477 address, kpasswd_port, nt_errstr(status)));
478 talloc_free(kpasswd_socket);
482 /* within the kdc task we want to be a single process, so
483 ask for the single process model ops and pass these to the
484 stream_setup_socket() call. */
485 model_ops = process_model_byname("single");
487 DEBUG(0,("Can't find 'single' process model_ops\n"));
488 talloc_free(kdc_socket);
489 return NT_STATUS_INTERNAL_ERROR;
492 status = stream_setup_socket(kdc->task->event_ctx, model_ops,
494 "ip", address, &kdc_port, kdc);
495 if (!NT_STATUS_IS_OK(status)) {
496 DEBUG(0,("Failed to bind to %s:%u TCP - %s\n",
497 address, kdc_port, nt_errstr(status)));
498 talloc_free(kdc_socket);
502 status = stream_setup_socket(kdc->task->event_ctx, model_ops,
503 &kpasswdd_tcp_stream_ops,
504 "ip", address, &kpasswd_port, kdc);
505 if (!NT_STATUS_IS_OK(status)) {
506 DEBUG(0,("Failed to bind to %s:%u TCP - %s\n",
507 address, kpasswd_port, nt_errstr(status)));
508 talloc_free(kdc_socket);
517 setup our listening sockets on the configured network interfaces
519 static NTSTATUS kdc_startup_interfaces(struct kdc_server *kdc)
521 int num_interfaces = iface_count();
522 TALLOC_CTX *tmp_ctx = talloc_new(kdc);
527 for (i=0; i<num_interfaces; i++) {
528 const char *address = talloc_strdup(tmp_ctx, iface_n_ip(i));
529 status = kdc_add_socket(kdc, address, lp_krb5_port(),
531 NT_STATUS_NOT_OK_RETURN(status);
534 talloc_free(tmp_ctx);
539 static struct krb5plugin_windc_ftable windc_plugin_table = {
540 .minor_version = KRB5_WINDC_PLUGING_MINOR,
541 .init = samba_kdc_plugin_init,
542 .fini = samba_kdc_plugin_fini,
543 .pac_generate = samba_kdc_get_pac,
544 .pac_verify = samba_kdc_reget_pac,
545 .client_access = samba_kdc_check_client_access,
552 static void kdc_task_init(struct task_server *task)
554 struct kdc_server *kdc;
558 switch (lp_server_role()) {
559 case ROLE_STANDALONE:
560 task_server_terminate(task, "kdc: no KDC required in standalone configuration");
562 case ROLE_DOMAIN_MEMBER:
563 task_server_terminate(task, "kdc: no KDC required in member server configuration");
565 case ROLE_DOMAIN_CONTROLLER:
566 /* Yes, we want a KDC */
570 if (iface_count() == 0) {
571 task_server_terminate(task, "kdc: no network interfaces configured");
575 task_server_set_title(task, "task[kdc]");
577 kdc = talloc(task, struct kdc_server);
579 task_server_terminate(task, "kdc: out of memory");
585 initialize_krb5_error_table();
587 ret = smb_krb5_init_context(kdc, task->event_ctx, &kdc->smb_krb5_context);
589 DEBUG(1,("kdc_task_init: krb5_init_context failed (%s)\n",
590 error_message(ret)));
591 task_server_terminate(task, "kdc: krb5_init_context failed");
595 krb5_add_et_list(kdc->smb_krb5_context->krb5_context, initialize_hdb_error_table_r);
597 ret = krb5_kdc_get_config(kdc->smb_krb5_context->krb5_context,
600 task_server_terminate(task, "kdc: failed to get KDC configuration");
604 kdc->config->logf = kdc->smb_krb5_context->logf;
605 kdc->config->db = talloc(kdc, struct HDB *);
606 if (!kdc->config->db) {
607 task_server_terminate(task, "kdc: out of memory");
610 kdc->config->num_db = 1;
612 status = kdc_hdb_ldb_create(kdc, kdc->smb_krb5_context->krb5_context,
613 &kdc->config->db[0], NULL);
614 if (!NT_STATUS_IS_OK(status)) {
615 task_server_terminate(task, "kdc: hdb_ldb_create (setup KDC database) failed");
619 ret = krb5_kt_register(kdc->smb_krb5_context->krb5_context, &hdb_kt_ops);
621 task_server_terminate(task, "kdc: failed to register hdb keytab");
625 /* Registar WinDC hooks */
626 ret = _krb5_plugin_register(kdc->smb_krb5_context->krb5_context,
627 PLUGIN_TYPE_DATA, "windc",
628 &windc_plugin_table);
630 task_server_terminate(task, "kdc: failed to register hdb keytab");
634 krb5_kdc_windc_init(kdc->smb_krb5_context->krb5_context);
636 kdc_mem_ctx = kdc->smb_krb5_context;
638 /* start listening on the configured network interfaces */
639 status = kdc_startup_interfaces(kdc);
640 if (!NT_STATUS_IS_OK(status)) {
641 task_server_terminate(task, "kdc failed to setup interfaces");
645 irpc_add_name(task->msg_ctx, "kdc_server");
650 called on startup of the KDC service
652 static NTSTATUS kdc_init(struct event_context *event_ctx,
653 const struct model_ops *model_ops)
655 return task_server_startup(event_ctx, model_ops, kdc_task_init);
658 /* called at smbd startup - register ourselves as a server service */
659 NTSTATUS server_service_kdc_init(void)
661 return register_server_service("kdc", kdc_init);