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 /* hold all the info needed to send a reply */
38 struct kdc_reply *next, *prev;
39 struct socket_address *dest;
43 typedef BOOL (*kdc_process_fn_t)(struct kdc_server *kdc,
47 struct socket_address *peer_addr,
48 struct socket_address *my_addr);
50 /* hold information about one kdc socket */
52 struct socket_context *sock;
53 struct kdc_server *kdc;
56 /* a queue of outgoing replies that have been deferred */
57 struct kdc_reply *send_queue;
59 kdc_process_fn_t process;
62 state of an open tcp connection
64 struct kdc_tcp_connection {
65 /* stream connection we belong to */
66 struct stream_connection *conn;
68 /* the kdc_server the connection belongs to */
69 struct kdc_server *kdc;
71 struct packet_context *packet;
73 kdc_process_fn_t process;
77 handle fd send events on a KDC socket
79 static void kdc_send_handler(struct kdc_socket *kdc_socket)
81 while (kdc_socket->send_queue) {
82 struct kdc_reply *rep = kdc_socket->send_queue;
86 status = socket_sendto(kdc_socket->sock, &rep->packet, &sendlen, 0,
88 if (NT_STATUS_EQUAL(status, STATUS_MORE_ENTRIES)) {
91 if (NT_STATUS_EQUAL(status, NT_STATUS_INVALID_BUFFER_SIZE)) {
92 /* Replace with a krb err, response to big */
95 DLIST_REMOVE(kdc_socket->send_queue, rep);
99 if (kdc_socket->send_queue == NULL) {
100 EVENT_FD_NOT_WRITEABLE(kdc_socket->fde);
106 handle fd recv events on a KDC socket
108 static void kdc_recv_handler(struct kdc_socket *kdc_socket)
111 TALLOC_CTX *tmp_ctx = talloc_new(kdc_socket);
113 struct kdc_reply *rep;
116 struct socket_address *src;
117 struct socket_address *my_addr;
120 status = socket_pending(kdc_socket->sock, &dsize);
121 if (!NT_STATUS_IS_OK(status)) {
122 talloc_free(tmp_ctx);
126 blob = data_blob_talloc(kdc_socket, NULL, dsize);
127 if (blob.data == NULL) {
128 /* hope this is a temporary low memory condition */
129 talloc_free(tmp_ctx);
133 status = socket_recvfrom(kdc_socket->sock, blob.data, blob.length, &nread, 0,
135 if (!NT_STATUS_IS_OK(status)) {
136 talloc_free(tmp_ctx);
141 DEBUG(10,("Received krb5 UDP packet of length %lu from %s:%u\n",
142 (long)blob.length, src->addr, (uint16_t)src->port));
144 my_addr = socket_get_my_addr(kdc_socket->sock, tmp_ctx);
146 talloc_free(tmp_ctx);
152 ret = kdc_socket->process(kdc_socket->kdc,
158 talloc_free(tmp_ctx);
162 /* queue a pending reply */
163 rep = talloc(kdc_socket, struct kdc_reply);
165 talloc_free(tmp_ctx);
168 rep->dest = talloc_steal(rep, src);
170 talloc_steal(rep, reply.data);
172 if (rep->packet.data == NULL) {
174 talloc_free(tmp_ctx);
178 DLIST_ADD_END(kdc_socket->send_queue, rep, struct kdc_reply *);
179 EVENT_FD_WRITEABLE(kdc_socket->fde);
180 talloc_free(tmp_ctx);
184 handle fd events on a KDC socket
186 static void kdc_socket_handler(struct event_context *ev, struct fd_event *fde,
187 uint16_t flags, void *private)
189 struct kdc_socket *kdc_socket = talloc_get_type(private, struct kdc_socket);
190 if (flags & EVENT_FD_WRITE) {
191 kdc_send_handler(kdc_socket);
193 if (flags & EVENT_FD_READ) {
194 kdc_recv_handler(kdc_socket);
198 static void kdc_tcp_terminate_connection(struct kdc_tcp_connection *kdcconn, const char *reason)
200 stream_terminate_connection(kdcconn->conn, reason);
204 receive a full packet on a KDC connection
206 static NTSTATUS kdc_tcp_recv(void *private, DATA_BLOB blob)
208 struct kdc_tcp_connection *kdcconn = talloc_get_type(private,
209 struct kdc_tcp_connection);
210 NTSTATUS status = NT_STATUS_UNSUCCESSFUL;
211 TALLOC_CTX *tmp_ctx = talloc_new(kdcconn);
213 DATA_BLOB input, reply;
214 struct socket_address *src_addr;
215 struct socket_address *my_addr;
217 talloc_steal(tmp_ctx, blob.data);
219 src_addr = socket_get_peer_addr(kdcconn->conn->socket, tmp_ctx);
221 talloc_free(tmp_ctx);
222 return NT_STATUS_NO_MEMORY;
225 my_addr = socket_get_my_addr(kdcconn->conn->socket, tmp_ctx);
227 talloc_free(tmp_ctx);
228 return NT_STATUS_NO_MEMORY;
232 input = data_blob_const(blob.data + 4, blob.length - 4);
234 ret = kdcconn->process(kdcconn->kdc,
241 talloc_free(tmp_ctx);
242 return NT_STATUS_INTERNAL_ERROR;
245 /* and now encode the reply */
246 blob = data_blob_talloc(kdcconn, NULL, reply.length + 4);
248 talloc_free(tmp_ctx);
249 return NT_STATUS_NO_MEMORY;
252 RSIVAL(blob.data, 0, reply.length);
253 memcpy(blob.data + 4, reply.data, reply.length);
255 status = packet_send(kdcconn->packet, blob);
256 if (!NT_STATUS_IS_OK(status)) {
257 talloc_free(tmp_ctx);
261 /* the call isn't needed any more */
262 talloc_free(tmp_ctx);
267 receive some data on a KDC connection
269 static void kdc_tcp_recv_handler(struct stream_connection *conn, uint16_t flags)
271 struct kdc_tcp_connection *kdcconn = talloc_get_type(conn->private,
272 struct kdc_tcp_connection);
273 packet_recv(kdcconn->packet);
277 called on a tcp recv error
279 static void kdc_tcp_recv_error(void *private, NTSTATUS status)
281 struct kdc_tcp_connection *kdcconn = talloc_get_type(private, struct kdc_tcp_connection);
282 kdc_tcp_terminate_connection(kdcconn, nt_errstr(status));
286 called when we can write to a connection
288 static void kdc_tcp_send(struct stream_connection *conn, uint16_t flags)
290 struct kdc_tcp_connection *kdcconn = talloc_get_type(conn->private,
291 struct kdc_tcp_connection);
292 packet_queue_run(kdcconn->packet);
296 Wrapper for krb5_kdc_process_krb5_request, converting to/from Samba
300 static BOOL kdc_process(struct kdc_server *kdc,
304 struct socket_address *peer_addr,
305 struct socket_address *my_addr)
310 DEBUG(10,("Received KDC packet of length %lu from %s:%d\n",
311 (long)input->length - 4, peer_addr->addr, peer_addr->port));
313 ret = krb5_kdc_process_krb5_request(kdc->smb_krb5_context->krb5_context,
315 input->data, input->length,
318 peer_addr->sockaddr);
320 *reply = data_blob(NULL, 0);
323 *reply = data_blob_talloc(mem_ctx, k5_reply.data, k5_reply.length);
324 krb5_data_free(&k5_reply);
329 called when we get a new connection
331 static void kdc_tcp_generic_accept(struct stream_connection *conn, kdc_process_fn_t process_fn)
333 struct kdc_server *kdc = talloc_get_type(conn->private, struct kdc_server);
334 struct kdc_tcp_connection *kdcconn;
336 kdcconn = talloc_zero(conn, struct kdc_tcp_connection);
338 stream_terminate_connection(conn, "kdc_tcp_accept: out of memory");
341 kdcconn->conn = conn;
343 kdcconn->process = process_fn;
344 conn->private = kdcconn;
346 kdcconn->packet = packet_init(kdcconn);
347 if (kdcconn->packet == NULL) {
348 kdc_tcp_terminate_connection(kdcconn, "kdc_tcp_accept: out of memory");
351 packet_set_private(kdcconn->packet, kdcconn);
352 packet_set_socket(kdcconn->packet, conn->socket);
353 packet_set_callback(kdcconn->packet, kdc_tcp_recv);
354 packet_set_full_request(kdcconn->packet, packet_full_request_u32);
355 packet_set_error_handler(kdcconn->packet, kdc_tcp_recv_error);
356 packet_set_event_context(kdcconn->packet, conn->event.ctx);
357 packet_set_fde(kdcconn->packet, conn->event.fde);
358 packet_set_serialise(kdcconn->packet);
361 static void kdc_tcp_accept(struct stream_connection *conn)
363 kdc_tcp_generic_accept(conn, kdc_process);
366 static const struct stream_server_ops kdc_tcp_stream_ops = {
368 .accept_connection = kdc_tcp_accept,
369 .recv_handler = kdc_tcp_recv_handler,
370 .send_handler = kdc_tcp_send
373 static void kpasswdd_tcp_accept(struct stream_connection *conn)
375 kdc_tcp_generic_accept(conn, kpasswdd_process);
378 static const struct stream_server_ops kpasswdd_tcp_stream_ops = {
379 .name = "kpasswdd_tcp",
380 .accept_connection = kpasswdd_tcp_accept,
381 .recv_handler = kdc_tcp_recv_handler,
382 .send_handler = kdc_tcp_send
386 start listening on the given address
388 static NTSTATUS kdc_add_socket(struct kdc_server *kdc, const char *address)
390 const struct model_ops *model_ops;
391 struct kdc_socket *kdc_socket;
392 struct kdc_socket *kpasswd_socket;
393 struct socket_address *kdc_address, *kpasswd_address;
395 uint16_t kdc_port = lp_krb5_port();
396 uint16_t kpasswd_port = lp_kpasswd_port();
398 kdc_socket = talloc(kdc, struct kdc_socket);
399 NT_STATUS_HAVE_NO_MEMORY(kdc_socket);
401 kpasswd_socket = talloc(kdc, struct kdc_socket);
402 NT_STATUS_HAVE_NO_MEMORY(kpasswd_socket);
404 status = socket_create("ip", SOCKET_TYPE_DGRAM, &kdc_socket->sock, 0);
405 if (!NT_STATUS_IS_OK(status)) {
406 talloc_free(kdc_socket);
410 status = socket_create("ip", SOCKET_TYPE_DGRAM, &kpasswd_socket->sock, 0);
411 if (!NT_STATUS_IS_OK(status)) {
412 talloc_free(kpasswd_socket);
416 kdc_socket->kdc = kdc;
417 kdc_socket->send_queue = NULL;
418 kdc_socket->process = kdc_process;
420 talloc_steal(kdc_socket, kdc_socket->sock);
422 kdc_socket->fde = event_add_fd(kdc->task->event_ctx, kdc,
423 socket_get_fd(kdc_socket->sock), EVENT_FD_READ,
424 kdc_socket_handler, kdc_socket);
426 kdc_address = socket_address_from_strings(kdc_socket, kdc_socket->sock->backend_name,
428 NT_STATUS_HAVE_NO_MEMORY(kdc_address);
430 status = socket_listen(kdc_socket->sock, kdc_address, 0, 0);
431 if (!NT_STATUS_IS_OK(status)) {
432 DEBUG(0,("Failed to bind to %s:%d UDP for kdc - %s\n",
433 address, kdc_port, nt_errstr(status)));
434 talloc_free(kdc_socket);
438 kpasswd_socket->kdc = kdc;
439 kpasswd_socket->send_queue = NULL;
440 kpasswd_socket->process = kpasswdd_process;
442 talloc_steal(kpasswd_socket, kpasswd_socket->sock);
444 kpasswd_socket->fde = event_add_fd(kdc->task->event_ctx, kdc,
445 socket_get_fd(kpasswd_socket->sock), EVENT_FD_READ,
446 kdc_socket_handler, kpasswd_socket);
448 kpasswd_address = socket_address_from_strings(kpasswd_socket, kpasswd_socket->sock->backend_name,
449 address, kpasswd_port);
450 NT_STATUS_HAVE_NO_MEMORY(kpasswd_address);
452 status = socket_listen(kpasswd_socket->sock, kpasswd_address, 0, 0);
453 if (!NT_STATUS_IS_OK(status)) {
454 DEBUG(0,("Failed to bind to %s:%d UDP for kpasswd - %s\n",
455 address, kpasswd_port, nt_errstr(status)));
456 talloc_free(kpasswd_socket);
460 /* within the kdc task we want to be a single process, so
461 ask for the single process model ops and pass these to the
462 stream_setup_socket() call. */
463 model_ops = process_model_byname("single");
465 DEBUG(0,("Can't find 'single' process model_ops\n"));
466 talloc_free(kdc_socket);
467 return NT_STATUS_INTERNAL_ERROR;
470 status = stream_setup_socket(kdc->task->event_ctx, model_ops,
472 "ip", address, &kdc_port, kdc);
473 if (!NT_STATUS_IS_OK(status)) {
474 DEBUG(0,("Failed to bind to %s:%u TCP - %s\n",
475 address, kdc_port, nt_errstr(status)));
476 talloc_free(kdc_socket);
480 status = stream_setup_socket(kdc->task->event_ctx, model_ops,
481 &kpasswdd_tcp_stream_ops,
482 "ip", address, &kpasswd_port, kdc);
483 if (!NT_STATUS_IS_OK(status)) {
484 DEBUG(0,("Failed to bind to %s:%u TCP - %s\n",
485 address, kpasswd_port, nt_errstr(status)));
486 talloc_free(kdc_socket);
495 setup our listening sockets on the configured network interfaces
497 static NTSTATUS kdc_startup_interfaces(struct kdc_server *kdc)
499 int num_interfaces = iface_count();
500 TALLOC_CTX *tmp_ctx = talloc_new(kdc);
503 /* if we are allowing incoming packets from any address, then
504 we need to bind to the wildcard address */
505 if (!lp_bind_interfaces_only()) {
506 status = kdc_add_socket(kdc, "0.0.0.0");
507 NT_STATUS_NOT_OK_RETURN(status);
511 for (i=0; i<num_interfaces; i++) {
512 const char *address = talloc_strdup(tmp_ctx, iface_n_ip(i));
513 status = kdc_add_socket(kdc, address);
514 NT_STATUS_NOT_OK_RETURN(status);
518 talloc_free(tmp_ctx);
526 static void kdc_task_init(struct task_server *task)
528 struct kdc_server *kdc;
532 if (iface_count() == 0) {
533 task_server_terminate(task, "kdc: no network interfaces configured");
537 kdc = talloc(task, struct kdc_server);
539 task_server_terminate(task, "kdc: out of memory");
545 /* Setup the KDC configuration */
546 kdc->config = talloc(kdc, krb5_kdc_configuration);
548 task_server_terminate(task, "kdc: out of memory");
551 krb5_kdc_default_config(kdc->config);
553 initialize_krb5_error_table();
555 ret = smb_krb5_init_context(kdc, &kdc->smb_krb5_context);
557 DEBUG(1,("kdc_task_init: krb5_init_context failed (%s)\n",
558 error_message(ret)));
559 task_server_terminate(task, "kdc: krb5_init_context failed");
563 krb5_add_et_list(kdc->smb_krb5_context->krb5_context, initialize_hdb_error_table_r);
565 kdc->config->logf = kdc->smb_krb5_context->logf;
566 kdc->config->db = talloc(kdc->config, struct HDB *);
567 if (!kdc->config->db) {
568 task_server_terminate(task, "kdc: out of memory");
571 kdc->config->num_db = 1;
573 status = kdc_hdb_ldb_create(kdc, kdc->smb_krb5_context->krb5_context,
574 &kdc->config->db[0], NULL);
575 if (!NT_STATUS_IS_OK(status)) {
576 task_server_terminate(task, "kdc: hdb_ldb_create (setup KDC database) failed");
580 ret = krb5_kt_register(kdc->smb_krb5_context->krb5_context, &hdb_kt_ops);
582 task_server_terminate(task, "kdc: failed to register hdb keytab");
585 /* start listening on the configured network interfaces */
586 status = kdc_startup_interfaces(kdc);
587 if (!NT_STATUS_IS_OK(status)) {
588 task_server_terminate(task, "kdc failed to setup interfaces");
592 irpc_add_name(task->msg_ctx, "kdc_server");
597 called on startup of the KDC service
599 static NTSTATUS kdc_init(struct event_context *event_ctx,
600 const struct model_ops *model_ops)
602 return task_server_startup(event_ctx, model_ops, kdc_task_init);
605 /* called at smbd startup - register ourselves as a server service */
606 NTSTATUS server_service_kdc_init(void)
608 return register_server_service("kdc", kdc_init);