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 const char *dest_address;
44 /* hold information about one kdc socket */
46 struct socket_context *sock;
47 struct kdc_server *kdc;
50 /* a queue of outgoing replies that have been deferred */
51 struct kdc_reply *send_queue;
53 BOOL (*process)(struct kdc_server *kdc,
61 state of an open tcp connection
63 struct kdc_tcp_connection {
64 /* stream connection we belong to */
65 struct stream_connection *conn;
67 /* the kdc_server the connection belongs to */
68 struct kdc_server *kdc;
70 struct packet_context *packet;
72 BOOL (*process)(struct kdc_server *kdc,
81 handle fd send events on a KDC socket
83 static void kdc_send_handler(struct kdc_socket *kdc_socket)
85 while (kdc_socket->send_queue) {
86 struct kdc_reply *rep = kdc_socket->send_queue;
90 status = socket_sendto(kdc_socket->sock, &rep->packet, &sendlen, 0,
91 rep->dest_address, rep->dest_port);
92 if (NT_STATUS_EQUAL(status, STATUS_MORE_ENTRIES)) {
95 if (NT_STATUS_EQUAL(status, NT_STATUS_INVALID_BUFFER_SIZE)) {
96 /* Replace with a krb err, response to big */
99 DLIST_REMOVE(kdc_socket->send_queue, rep);
103 if (kdc_socket->send_queue == NULL) {
104 EVENT_FD_NOT_WRITEABLE(kdc_socket->fde);
110 handle fd recv events on a KDC socket
112 static void kdc_recv_handler(struct kdc_socket *kdc_socket)
115 TALLOC_CTX *tmp_ctx = talloc_new(kdc_socket);
117 struct kdc_reply *rep;
120 const char *src_addr;
124 status = socket_pending(kdc_socket->sock, &dsize);
125 if (!NT_STATUS_IS_OK(status)) {
126 talloc_free(tmp_ctx);
130 blob = data_blob_talloc(kdc_socket, NULL, dsize);
131 if (blob.data == NULL) {
132 /* hope this is a temporary low memory condition */
133 talloc_free(tmp_ctx);
137 status = socket_recvfrom(kdc_socket->sock, blob.data, blob.length, &nread, 0,
138 &src_addr, &src_port);
139 if (!NT_STATUS_IS_OK(status)) {
140 talloc_free(tmp_ctx);
143 talloc_steal(tmp_ctx, src_addr);
146 DEBUG(2,("Received krb5 UDP packet of length %u from %s:%u\n",
147 blob.length, src_addr, (uint16_t)src_port));
150 ret = kdc_socket->process(kdc_socket->kdc,
156 talloc_free(tmp_ctx);
160 /* queue a pending reply */
161 rep = talloc(kdc_socket, struct kdc_reply);
163 talloc_free(tmp_ctx);
166 rep->dest_address = talloc_steal(rep, src_addr);
167 rep->dest_port = src_port;
169 talloc_steal(rep, reply.data);
171 if (rep->packet.data == NULL) {
173 talloc_free(tmp_ctx);
177 DLIST_ADD_END(kdc_socket->send_queue, rep, struct kdc_reply *);
178 EVENT_FD_WRITEABLE(kdc_socket->fde);
179 talloc_free(tmp_ctx);
183 handle fd events on a KDC socket
185 static void kdc_socket_handler(struct event_context *ev, struct fd_event *fde,
186 uint16_t flags, void *private)
188 struct kdc_socket *kdc_socket = talloc_get_type(private, struct kdc_socket);
189 if (flags & EVENT_FD_WRITE) {
190 kdc_send_handler(kdc_socket);
192 if (flags & EVENT_FD_READ) {
193 kdc_recv_handler(kdc_socket);
197 static void kdc_tcp_terminate_connection(struct kdc_tcp_connection *kdcconn, const char *reason)
199 stream_terminate_connection(kdcconn->conn, reason);
203 receive a full packet on a KDC connection
205 static NTSTATUS kdc_tcp_recv(void *private, DATA_BLOB blob)
207 struct kdc_tcp_connection *kdcconn = talloc_get_type(private,
208 struct kdc_tcp_connection);
209 NTSTATUS status = NT_STATUS_UNSUCCESSFUL;
210 TALLOC_CTX *tmp_ctx = talloc_new(kdcconn);
211 const char *src_addr;
214 DATA_BLOB input, reply;
216 talloc_steal(tmp_ctx, blob.data);
218 src_addr = socket_get_peer_addr(kdcconn->conn->socket, tmp_ctx);
219 if (!src_addr) goto nomem;
220 src_port = socket_get_peer_port(kdcconn->conn->socket);
222 DEBUG(2,("Received krb5 TCP packet of length %u from %s:%u\n",
223 blob.length - 4, src_addr, src_port));
226 input = data_blob_const(blob.data + 4, blob.length - 4);
228 ret = kdcconn->process(kdcconn->kdc,
234 status = NT_STATUS_INTERNAL_ERROR;
238 /* and now encode the reply */
239 blob = data_blob_talloc(kdcconn, NULL, reply.length + 4);
244 RSIVAL(blob.data, 0, reply.length);
245 memcpy(blob.data + 4, reply.data, reply.length);
247 status = packet_send(kdcconn->packet, blob);
248 if (!NT_STATUS_IS_OK(status)) {
252 /* the call isn't needed any more */
253 talloc_free(tmp_ctx);
256 status = NT_STATUS_NO_MEMORY;
263 receive some data on a KDC connection
265 static void kdc_tcp_recv_handler(struct stream_connection *conn, uint16_t flags)
267 struct kdc_tcp_connection *kdcconn = talloc_get_type(conn->private,
268 struct kdc_tcp_connection);
269 packet_recv(kdcconn->packet);
273 called on a tcp recv error
275 static void kdc_tcp_recv_error(void *private, NTSTATUS status)
277 struct kdc_tcp_connection *kdcconn = talloc_get_type(private, struct kdc_tcp_connection);
278 kdc_tcp_terminate_connection(kdcconn, nt_errstr(status));
282 called when we can write to a connection
284 static void kdc_tcp_send(struct stream_connection *conn, uint16_t flags)
286 struct kdc_tcp_connection *kdcconn = talloc_get_type(conn->private,
287 struct kdc_tcp_connection);
288 packet_queue_run(kdcconn->packet);
292 Wrapper for krb5_kdc_process_krb5_request, converting to/from Samba
296 static BOOL kdc_process(struct kdc_server *kdc,
300 const char *src_addr,
305 struct ipv4_addr addr;
306 struct sockaddr_in src_sock_addr;
308 /* TODO: This really should be in a utility function somewhere */
309 ZERO_STRUCT(src_sock_addr);
310 #ifdef HAVE_SOCK_SIN_LEN
311 src_sock_addr.sin_len = sizeof(src_sock_addr);
313 addr = interpret_addr2(src_addr);
314 src_sock_addr.sin_addr.s_addr = addr.addr;
315 src_sock_addr.sin_port = htons(src_port);
316 src_sock_addr.sin_family = PF_INET;
319 ret = krb5_kdc_process_krb5_request(kdc->smb_krb5_context->krb5_context,
321 input->data, input->length,
324 (struct sockaddr *)&src_sock_addr);
326 *reply = data_blob(NULL, 0);
329 *reply = data_blob_talloc(mem_ctx, k5_reply.data, k5_reply.length);
330 krb5_data_free(&k5_reply);
335 called when we get a new connection
337 static void kdc_tcp_accept(struct stream_connection *conn)
339 struct kdc_server *kdc = talloc_get_type(conn->private, struct kdc_server);
340 struct kdc_tcp_connection *kdcconn;
342 kdcconn = talloc_zero(conn, struct kdc_tcp_connection);
344 stream_terminate_connection(conn, "kdc_tcp_accept: out of memory");
347 kdcconn->conn = conn;
349 kdcconn->process = kdc_process;
350 conn->private = kdcconn;
352 kdcconn->packet = packet_init(kdcconn);
353 if (kdcconn->packet == NULL) {
354 stream_terminate_connection(conn, "kdc_tcp_accept: out of memory");
357 packet_set_private(kdcconn->packet, kdcconn);
358 packet_set_socket(kdcconn->packet, conn->socket);
359 packet_set_callback(kdcconn->packet, kdc_tcp_recv);
360 packet_set_full_request(kdcconn->packet, packet_full_request_u32);
361 packet_set_error_handler(kdcconn->packet, kdc_tcp_recv_error);
362 packet_set_event_context(kdcconn->packet, conn->event.ctx);
363 packet_set_fde(kdcconn->packet, conn->event.fde);
364 packet_set_serialise(kdcconn->packet);
367 static const struct stream_server_ops kdc_tcp_stream_ops = {
369 .accept_connection = kdc_tcp_accept,
370 .recv_handler = kdc_tcp_recv_handler,
371 .send_handler = kdc_tcp_send
375 called when we get a new connection
377 void kpasswdd_tcp_accept(struct stream_connection *conn)
379 struct kdc_server *kdc = talloc_get_type(conn->private, struct kdc_server);
380 struct kdc_tcp_connection *kdcconn;
382 kdcconn = talloc_zero(conn, struct kdc_tcp_connection);
384 stream_terminate_connection(conn, "kdc_tcp_accept: out of memory");
387 kdcconn->conn = conn;
389 kdcconn->process = kpasswdd_process;
390 conn->private = kdcconn;
393 static const struct stream_server_ops kpasswdd_tcp_stream_ops = {
394 .name = "kpasswdd_tcp",
395 .accept_connection = kpasswdd_tcp_accept,
396 .recv_handler = kdc_tcp_recv_handler,
397 .send_handler = kdc_tcp_send
401 start listening on the given address
403 static NTSTATUS kdc_add_socket(struct kdc_server *kdc, const char *address)
405 const struct model_ops *model_ops;
406 struct kdc_socket *kdc_socket;
407 struct kdc_socket *kpasswd_socket;
409 uint16_t kdc_port = lp_krb5_port();
410 uint16_t kpasswd_port = lp_kpasswd_port();
412 kdc_socket = talloc(kdc, struct kdc_socket);
413 NT_STATUS_HAVE_NO_MEMORY(kdc_socket);
415 kpasswd_socket = talloc(kdc, struct kdc_socket);
416 NT_STATUS_HAVE_NO_MEMORY(kpasswd_socket);
418 status = socket_create("ip", SOCKET_TYPE_DGRAM, &kdc_socket->sock, 0);
419 if (!NT_STATUS_IS_OK(status)) {
420 talloc_free(kdc_socket);
424 status = socket_create("ip", SOCKET_TYPE_DGRAM, &kpasswd_socket->sock, 0);
425 if (!NT_STATUS_IS_OK(status)) {
426 talloc_free(kpasswd_socket);
430 kdc_socket->kdc = kdc;
431 kdc_socket->send_queue = NULL;
432 kdc_socket->process = kdc_process;
434 talloc_steal(kdc_socket, kdc_socket->sock);
436 kdc_socket->fde = event_add_fd(kdc->task->event_ctx, kdc,
437 socket_get_fd(kdc_socket->sock), EVENT_FD_READ,
438 kdc_socket_handler, kdc_socket);
440 status = socket_listen(kdc_socket->sock, address, kdc_port, 0, 0);
441 if (!NT_STATUS_IS_OK(status)) {
442 DEBUG(0,("Failed to bind to %s:%d UDP for kdc - %s\n",
443 address, kdc_port, nt_errstr(status)));
444 talloc_free(kdc_socket);
448 kpasswd_socket->kdc = kdc;
449 kpasswd_socket->send_queue = NULL;
450 kpasswd_socket->process = kpasswdd_process;
452 talloc_steal(kpasswd_socket, kpasswd_socket->sock);
454 kpasswd_socket->fde = event_add_fd(kdc->task->event_ctx, kdc,
455 socket_get_fd(kpasswd_socket->sock), EVENT_FD_READ,
456 kdc_socket_handler, kpasswd_socket);
458 status = socket_listen(kpasswd_socket->sock, address, kpasswd_port, 0, 0);
459 if (!NT_STATUS_IS_OK(status)) {
460 DEBUG(0,("Failed to bind to %s:%d UDP for kpasswd - %s\n",
461 address, kpasswd_port, nt_errstr(status)));
462 talloc_free(kpasswd_socket);
466 /* within the kdc task we want to be a single process, so
467 ask for the single process model ops and pass these to the
468 stream_setup_socket() call. */
469 model_ops = process_model_byname("single");
471 DEBUG(0,("Can't find 'single' process model_ops\n"));
472 talloc_free(kdc_socket);
473 return NT_STATUS_INTERNAL_ERROR;
476 status = stream_setup_socket(kdc->task->event_ctx, model_ops,
478 "ip", address, &kdc_port, kdc);
479 if (!NT_STATUS_IS_OK(status)) {
480 DEBUG(0,("Failed to bind to %s:%u TCP - %s\n",
481 address, kdc_port, nt_errstr(status)));
482 talloc_free(kdc_socket);
486 status = stream_setup_socket(kdc->task->event_ctx, model_ops,
487 &kpasswdd_tcp_stream_ops,
488 "ip", address, &kpasswd_port, kdc);
489 if (!NT_STATUS_IS_OK(status)) {
490 DEBUG(0,("Failed to bind to %s:%u TCP - %s\n",
491 address, kpasswd_port, nt_errstr(status)));
492 talloc_free(kdc_socket);
501 setup our listening sockets on the configured network interfaces
503 static NTSTATUS kdc_startup_interfaces(struct kdc_server *kdc)
505 int num_interfaces = iface_count();
506 TALLOC_CTX *tmp_ctx = talloc_new(kdc);
509 /* if we are allowing incoming packets from any address, then
510 we need to bind to the wildcard address */
511 if (!lp_bind_interfaces_only()) {
512 status = kdc_add_socket(kdc, "0.0.0.0");
513 NT_STATUS_NOT_OK_RETURN(status);
517 for (i=0; i<num_interfaces; i++) {
518 const char *address = talloc_strdup(tmp_ctx, iface_n_ip(i));
519 status = kdc_add_socket(kdc, address);
520 NT_STATUS_NOT_OK_RETURN(status);
524 talloc_free(tmp_ctx);
532 static void kdc_task_init(struct task_server *task)
534 struct kdc_server *kdc;
538 if (iface_count() == 0) {
539 task_server_terminate(task, "kdc: no network interfaces configured");
543 kdc = talloc(task, struct kdc_server);
545 task_server_terminate(task, "kdc: out of memory");
551 /* Setup the KDC configuration */
552 kdc->config = talloc(kdc, krb5_kdc_configuration);
554 task_server_terminate(task, "kdc: out of memory");
557 krb5_kdc_default_config(kdc->config);
559 /* NAT and the like make this pointless, and painful */
560 kdc->config->check_ticket_addresses = FALSE;
562 initialize_krb5_error_table();
564 ret = smb_krb5_init_context(kdc, &kdc->smb_krb5_context);
566 DEBUG(1,("kdc_task_init: krb5_init_context failed (%s)\n",
567 error_message(ret)));
568 task_server_terminate(task, "kdc: krb5_init_context failed");
572 krb5_add_et_list(kdc->smb_krb5_context->krb5_context, initialize_hdb_error_table_r);
574 kdc->config->logf = kdc->smb_krb5_context->logf;
575 kdc->config->db = talloc(kdc->config, struct HDB *);
576 if (!kdc->config->db) {
577 task_server_terminate(task, "kdc: out of memory");
580 kdc->config->num_db = 1;
582 ret = hdb_ldb_create(kdc, kdc->smb_krb5_context->krb5_context,
583 &kdc->config->db[0], NULL);
585 DEBUG(1, ("kdc_task_init: hdb_ldb_create fails: %s\n",
586 smb_get_krb5_error_message(kdc->smb_krb5_context->krb5_context, ret, kdc)));
587 task_server_terminate(task, "kdc: hdb_ldb_create failed");
591 /* start listening on the configured network interfaces */
592 status = kdc_startup_interfaces(kdc);
593 if (!NT_STATUS_IS_OK(status)) {
594 task_server_terminate(task, "kdc failed to setup interfaces");
598 irpc_add_name(task->msg_ctx, "kdc_server");
603 called on startup of the KDC service
605 static NTSTATUS kdc_init(struct event_context *event_ctx,
606 const struct model_ops *model_ops)
608 return task_server_startup(event_ctx, model_ops, kdc_task_init);
611 /* called at smbd startup - register ourselves as a server service */
612 NTSTATUS server_service_kdc_init(void)
614 return register_server_service("kdc", kdc_init);