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 2 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, write to the Free Software
22 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
26 #include "smbd/service_task.h"
27 #include "smbd/service_stream.h"
28 #include "lib/events/events.h"
29 #include "lib/socket/socket.h"
31 #include "system/network.h"
32 #include "dlinklist.h"
33 #include "lib/messaging/irpc.h"
34 #include "lib/stream/packet.h"
36 #include "librpc/gen_ndr/samr.h"
38 /* hold all the info needed to send a reply */
40 struct kdc_reply *next, *prev;
41 struct socket_address *dest;
45 typedef BOOL (*kdc_process_fn_t)(struct kdc_server *kdc,
49 struct socket_address *peer_addr,
50 struct socket_address *my_addr);
52 /* hold information about one kdc socket */
54 struct socket_context *sock;
55 struct kdc_server *kdc;
58 /* a queue of outgoing replies that have been deferred */
59 struct kdc_reply *send_queue;
61 kdc_process_fn_t process;
64 state of an open tcp connection
66 struct kdc_tcp_connection {
67 /* stream connection we belong to */
68 struct stream_connection *conn;
70 /* the kdc_server the connection belongs to */
71 struct kdc_server *kdc;
73 struct packet_context *packet;
75 kdc_process_fn_t process;
79 handle fd send events on a KDC socket
81 static void kdc_send_handler(struct kdc_socket *kdc_socket)
83 while (kdc_socket->send_queue) {
84 struct kdc_reply *rep = kdc_socket->send_queue;
88 status = socket_sendto(kdc_socket->sock, &rep->packet, &sendlen, 0,
90 if (NT_STATUS_EQUAL(status, STATUS_MORE_ENTRIES)) {
93 if (NT_STATUS_EQUAL(status, NT_STATUS_INVALID_BUFFER_SIZE)) {
94 /* Replace with a krb err, response to big */
97 DLIST_REMOVE(kdc_socket->send_queue, rep);
101 if (kdc_socket->send_queue == NULL) {
102 EVENT_FD_NOT_WRITEABLE(kdc_socket->fde);
108 handle fd recv events on a KDC socket
110 static void kdc_recv_handler(struct kdc_socket *kdc_socket)
113 TALLOC_CTX *tmp_ctx = talloc_new(kdc_socket);
115 struct kdc_reply *rep;
118 struct socket_address *src;
119 struct socket_address *my_addr;
122 status = socket_pending(kdc_socket->sock, &dsize);
123 if (!NT_STATUS_IS_OK(status)) {
124 talloc_free(tmp_ctx);
128 blob = data_blob_talloc(kdc_socket, NULL, dsize);
129 if (blob.data == NULL) {
130 /* hope this is a temporary low memory condition */
131 talloc_free(tmp_ctx);
135 status = socket_recvfrom(kdc_socket->sock, blob.data, blob.length, &nread, 0,
137 if (!NT_STATUS_IS_OK(status)) {
138 talloc_free(tmp_ctx);
143 DEBUG(10,("Received krb5 UDP packet of length %lu from %s:%u\n",
144 (long)blob.length, src->addr, (uint16_t)src->port));
146 my_addr = socket_get_my_addr(kdc_socket->sock, tmp_ctx);
148 talloc_free(tmp_ctx);
154 ret = kdc_socket->process(kdc_socket->kdc,
160 talloc_free(tmp_ctx);
164 /* queue a pending reply */
165 rep = talloc(kdc_socket, struct kdc_reply);
167 talloc_free(tmp_ctx);
170 rep->dest = talloc_steal(rep, src);
172 talloc_steal(rep, reply.data);
174 if (rep->packet.data == NULL) {
176 talloc_free(tmp_ctx);
180 DLIST_ADD_END(kdc_socket->send_queue, rep, struct kdc_reply *);
181 EVENT_FD_WRITEABLE(kdc_socket->fde);
182 talloc_free(tmp_ctx);
186 handle fd events on a KDC socket
188 static void kdc_socket_handler(struct event_context *ev, struct fd_event *fde,
189 uint16_t flags, void *private)
191 struct kdc_socket *kdc_socket = talloc_get_type(private, struct kdc_socket);
192 if (flags & EVENT_FD_WRITE) {
193 kdc_send_handler(kdc_socket);
195 if (flags & EVENT_FD_READ) {
196 kdc_recv_handler(kdc_socket);
200 static void kdc_tcp_terminate_connection(struct kdc_tcp_connection *kdcconn, const char *reason)
202 stream_terminate_connection(kdcconn->conn, reason);
206 receive a full packet on a KDC connection
208 static NTSTATUS kdc_tcp_recv(void *private, DATA_BLOB blob)
210 struct kdc_tcp_connection *kdcconn = talloc_get_type(private,
211 struct kdc_tcp_connection);
212 NTSTATUS status = NT_STATUS_UNSUCCESSFUL;
213 TALLOC_CTX *tmp_ctx = talloc_new(kdcconn);
215 DATA_BLOB input, reply;
216 struct socket_address *src_addr;
217 struct socket_address *my_addr;
219 talloc_steal(tmp_ctx, blob.data);
221 src_addr = socket_get_peer_addr(kdcconn->conn->socket, tmp_ctx);
223 talloc_free(tmp_ctx);
224 return NT_STATUS_NO_MEMORY;
227 my_addr = socket_get_my_addr(kdcconn->conn->socket, tmp_ctx);
229 talloc_free(tmp_ctx);
230 return NT_STATUS_NO_MEMORY;
234 input = data_blob_const(blob.data + 4, blob.length - 4);
236 ret = kdcconn->process(kdcconn->kdc,
243 talloc_free(tmp_ctx);
244 return NT_STATUS_INTERNAL_ERROR;
247 /* and now encode the reply */
248 blob = data_blob_talloc(kdcconn, NULL, reply.length + 4);
250 talloc_free(tmp_ctx);
251 return NT_STATUS_NO_MEMORY;
254 RSIVAL(blob.data, 0, reply.length);
255 memcpy(blob.data + 4, reply.data, reply.length);
257 status = packet_send(kdcconn->packet, blob);
258 if (!NT_STATUS_IS_OK(status)) {
259 talloc_free(tmp_ctx);
263 /* the call isn't needed any more */
264 talloc_free(tmp_ctx);
269 receive some data on a KDC connection
271 static void kdc_tcp_recv_handler(struct stream_connection *conn, uint16_t flags)
273 struct kdc_tcp_connection *kdcconn = talloc_get_type(conn->private,
274 struct kdc_tcp_connection);
275 packet_recv(kdcconn->packet);
279 called on a tcp recv error
281 static void kdc_tcp_recv_error(void *private, NTSTATUS status)
283 struct kdc_tcp_connection *kdcconn = talloc_get_type(private, struct kdc_tcp_connection);
284 kdc_tcp_terminate_connection(kdcconn, nt_errstr(status));
288 called when we can write to a connection
290 static void kdc_tcp_send(struct stream_connection *conn, uint16_t flags)
292 struct kdc_tcp_connection *kdcconn = talloc_get_type(conn->private,
293 struct kdc_tcp_connection);
294 packet_queue_run(kdcconn->packet);
298 Wrapper for krb5_kdc_process_krb5_request, converting to/from Samba
302 static BOOL kdc_process(struct kdc_server *kdc,
306 struct socket_address *peer_addr,
307 struct socket_address *my_addr)
312 DEBUG(10,("Received KDC packet of length %lu from %s:%d\n",
313 (long)input->length - 4, peer_addr->addr, peer_addr->port));
315 ret = krb5_kdc_process_krb5_request(kdc->smb_krb5_context->krb5_context,
317 input->data, input->length,
320 peer_addr->sockaddr);
322 *reply = data_blob(NULL, 0);
325 *reply = data_blob_talloc(mem_ctx, k5_reply.data, k5_reply.length);
326 krb5_data_free(&k5_reply);
331 called when we get a new connection
333 static void kdc_tcp_generic_accept(struct stream_connection *conn, kdc_process_fn_t process_fn)
335 struct kdc_server *kdc = talloc_get_type(conn->private, struct kdc_server);
336 struct kdc_tcp_connection *kdcconn;
338 kdcconn = talloc_zero(conn, struct kdc_tcp_connection);
340 stream_terminate_connection(conn, "kdc_tcp_accept: out of memory");
343 kdcconn->conn = conn;
345 kdcconn->process = process_fn;
346 conn->private = kdcconn;
348 kdcconn->packet = packet_init(kdcconn);
349 if (kdcconn->packet == NULL) {
350 kdc_tcp_terminate_connection(kdcconn, "kdc_tcp_accept: out of memory");
353 packet_set_private(kdcconn->packet, kdcconn);
354 packet_set_socket(kdcconn->packet, conn->socket);
355 packet_set_callback(kdcconn->packet, kdc_tcp_recv);
356 packet_set_full_request(kdcconn->packet, packet_full_request_u32);
357 packet_set_error_handler(kdcconn->packet, kdc_tcp_recv_error);
358 packet_set_event_context(kdcconn->packet, conn->event.ctx);
359 packet_set_fde(kdcconn->packet, conn->event.fde);
360 packet_set_serialise(kdcconn->packet);
363 static void kdc_tcp_accept(struct stream_connection *conn)
365 kdc_tcp_generic_accept(conn, kdc_process);
368 static const struct stream_server_ops kdc_tcp_stream_ops = {
370 .accept_connection = kdc_tcp_accept,
371 .recv_handler = kdc_tcp_recv_handler,
372 .send_handler = kdc_tcp_send
375 static void kpasswdd_tcp_accept(struct stream_connection *conn)
377 kdc_tcp_generic_accept(conn, kpasswdd_process);
380 static const struct stream_server_ops kpasswdd_tcp_stream_ops = {
381 .name = "kpasswdd_tcp",
382 .accept_connection = kpasswdd_tcp_accept,
383 .recv_handler = kdc_tcp_recv_handler,
384 .send_handler = kdc_tcp_send
388 start listening on the given address
390 static NTSTATUS kdc_add_socket(struct kdc_server *kdc, const char *address)
392 const struct model_ops *model_ops;
393 struct kdc_socket *kdc_socket;
394 struct kdc_socket *kpasswd_socket;
395 struct socket_address *kdc_address, *kpasswd_address;
397 uint16_t kdc_port = lp_krb5_port();
398 uint16_t kpasswd_port = lp_kpasswd_port();
400 kdc_socket = talloc(kdc, struct kdc_socket);
401 NT_STATUS_HAVE_NO_MEMORY(kdc_socket);
403 kpasswd_socket = talloc(kdc, struct kdc_socket);
404 NT_STATUS_HAVE_NO_MEMORY(kpasswd_socket);
406 status = socket_create("ip", SOCKET_TYPE_DGRAM, &kdc_socket->sock, 0);
407 if (!NT_STATUS_IS_OK(status)) {
408 talloc_free(kdc_socket);
412 status = socket_create("ip", SOCKET_TYPE_DGRAM, &kpasswd_socket->sock, 0);
413 if (!NT_STATUS_IS_OK(status)) {
414 talloc_free(kpasswd_socket);
418 kdc_socket->kdc = kdc;
419 kdc_socket->send_queue = NULL;
420 kdc_socket->process = kdc_process;
422 talloc_steal(kdc_socket, kdc_socket->sock);
424 kdc_socket->fde = event_add_fd(kdc->task->event_ctx, kdc,
425 socket_get_fd(kdc_socket->sock), EVENT_FD_READ,
426 kdc_socket_handler, kdc_socket);
428 kdc_address = socket_address_from_strings(kdc_socket, kdc_socket->sock->backend_name,
430 NT_STATUS_HAVE_NO_MEMORY(kdc_address);
432 status = socket_listen(kdc_socket->sock, kdc_address, 0, 0);
433 if (!NT_STATUS_IS_OK(status)) {
434 DEBUG(0,("Failed to bind to %s:%d UDP for kdc - %s\n",
435 address, kdc_port, nt_errstr(status)));
436 talloc_free(kdc_socket);
440 kpasswd_socket->kdc = kdc;
441 kpasswd_socket->send_queue = NULL;
442 kpasswd_socket->process = kpasswdd_process;
444 talloc_steal(kpasswd_socket, kpasswd_socket->sock);
446 kpasswd_socket->fde = event_add_fd(kdc->task->event_ctx, kdc,
447 socket_get_fd(kpasswd_socket->sock), EVENT_FD_READ,
448 kdc_socket_handler, kpasswd_socket);
450 kpasswd_address = socket_address_from_strings(kpasswd_socket, kpasswd_socket->sock->backend_name,
451 address, kpasswd_port);
452 NT_STATUS_HAVE_NO_MEMORY(kpasswd_address);
454 status = socket_listen(kpasswd_socket->sock, kpasswd_address, 0, 0);
455 if (!NT_STATUS_IS_OK(status)) {
456 DEBUG(0,("Failed to bind to %s:%d UDP for kpasswd - %s\n",
457 address, kpasswd_port, nt_errstr(status)));
458 talloc_free(kpasswd_socket);
462 /* within the kdc task we want to be a single process, so
463 ask for the single process model ops and pass these to the
464 stream_setup_socket() call. */
465 model_ops = process_model_byname("single");
467 DEBUG(0,("Can't find 'single' process model_ops\n"));
468 talloc_free(kdc_socket);
469 return NT_STATUS_INTERNAL_ERROR;
472 status = stream_setup_socket(kdc->task->event_ctx, model_ops,
474 "ip", address, &kdc_port, kdc);
475 if (!NT_STATUS_IS_OK(status)) {
476 DEBUG(0,("Failed to bind to %s:%u TCP - %s\n",
477 address, kdc_port, nt_errstr(status)));
478 talloc_free(kdc_socket);
482 status = stream_setup_socket(kdc->task->event_ctx, model_ops,
483 &kpasswdd_tcp_stream_ops,
484 "ip", address, &kpasswd_port, kdc);
485 if (!NT_STATUS_IS_OK(status)) {
486 DEBUG(0,("Failed to bind to %s:%u TCP - %s\n",
487 address, kpasswd_port, nt_errstr(status)));
488 talloc_free(kdc_socket);
497 setup our listening sockets on the configured network interfaces
499 static NTSTATUS kdc_startup_interfaces(struct kdc_server *kdc)
501 int num_interfaces = iface_count();
502 TALLOC_CTX *tmp_ctx = talloc_new(kdc);
507 for (i=0; i<num_interfaces; i++) {
508 const char *address = talloc_strdup(tmp_ctx, iface_n_ip(i));
509 status = kdc_add_socket(kdc, address);
510 NT_STATUS_NOT_OK_RETURN(status);
513 /* if we are allowing incoming packets from any address, then
514 we need to bind to the wildcard address */
515 if (!lp_bind_interfaces_only()) {
516 status = kdc_add_socket(kdc, "0.0.0.0");
517 NT_STATUS_NOT_OK_RETURN(status);
520 talloc_free(tmp_ctx);
528 static void kdc_task_init(struct task_server *task)
530 struct kdc_server *kdc;
534 switch (lp_server_role()) {
535 case ROLE_STANDALONE:
536 task_server_terminate(task, "kdc: no KDC required in standalone configuration");
538 case ROLE_DOMAIN_MEMBER:
539 task_server_terminate(task, "kdc: no KDC required in member server configuration");
541 case ROLE_DOMAIN_PDC:
542 case ROLE_DOMAIN_BDC:
543 /* Yes, we want a KDC */
547 if (iface_count() == 0) {
548 task_server_terminate(task, "kdc: no network interfaces configured");
552 kdc = talloc(task, struct kdc_server);
554 task_server_terminate(task, "kdc: out of memory");
560 /* Setup the KDC configuration */
561 kdc->config = talloc(kdc, krb5_kdc_configuration);
563 task_server_terminate(task, "kdc: out of memory");
566 krb5_kdc_default_config(kdc->config);
568 initialize_krb5_error_table();
570 ret = smb_krb5_init_context(kdc, &kdc->smb_krb5_context);
572 DEBUG(1,("kdc_task_init: krb5_init_context failed (%s)\n",
573 error_message(ret)));
574 task_server_terminate(task, "kdc: krb5_init_context failed");
578 krb5_add_et_list(kdc->smb_krb5_context->krb5_context, initialize_hdb_error_table_r);
580 kdc->config->logf = kdc->smb_krb5_context->logf;
581 kdc->config->db = talloc(kdc->config, struct HDB *);
582 if (!kdc->config->db) {
583 task_server_terminate(task, "kdc: out of memory");
586 kdc->config->num_db = 1;
588 status = kdc_hdb_ldb_create(kdc, kdc->smb_krb5_context->krb5_context,
589 &kdc->config->db[0], NULL);
590 if (!NT_STATUS_IS_OK(status)) {
591 task_server_terminate(task, "kdc: hdb_ldb_create (setup KDC database) failed");
595 ret = krb5_kt_register(kdc->smb_krb5_context->krb5_context, &hdb_kt_ops);
597 task_server_terminate(task, "kdc: failed to register hdb keytab");
600 /* start listening on the configured network interfaces */
601 status = kdc_startup_interfaces(kdc);
602 if (!NT_STATUS_IS_OK(status)) {
603 task_server_terminate(task, "kdc failed to setup interfaces");
607 irpc_add_name(task->msg_ctx, "kdc_server");
612 called on startup of the KDC service
614 static NTSTATUS kdc_init(struct event_context *event_ctx,
615 const struct model_ops *model_ops)
617 return task_server_startup(event_ctx, model_ops, kdc_task_init);
620 /* called at smbd startup - register ourselves as a server service */
621 NTSTATUS server_service_kdc_init(void)
623 return register_server_service("kdc", kdc_init);