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"
35 /* hold all the info needed to send a reply */
37 struct kdc_reply *next, *prev;
38 const char *dest_address;
44 top level context structure for the kdc server
47 struct task_server *task;
48 krb5_kdc_configuration *config;
49 struct smb_krb5_context *smb_krb5_context;
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;
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 /* the partial data we've receiced yet */
74 /* the amount that we used yet from the partial buffer */
75 uint32_t partial_read;
77 /* prevent loops when we use half async code, while processing a requuest */
80 /* a queue of outgoing replies that have been deferred */
81 struct data_blob_list_item *send_queue;
85 handle fd send events on a KDC socket
87 static void kdc_send_handler(struct kdc_socket *kdc_socket)
89 while (kdc_socket->send_queue) {
90 struct kdc_reply *rep = kdc_socket->send_queue;
94 status = socket_sendto(kdc_socket->sock, &rep->packet, &sendlen, 0,
95 rep->dest_address, rep->dest_port);
96 if (NT_STATUS_EQUAL(status, STATUS_MORE_ENTRIES)) {
100 DLIST_REMOVE(kdc_socket->send_queue, rep);
104 if (kdc_socket->send_queue == NULL) {
105 EVENT_FD_NOT_WRITEABLE(kdc_socket->fde);
111 handle fd recv events on a KDC socket
113 static void kdc_recv_handler(struct kdc_socket *kdc_socket)
116 TALLOC_CTX *tmp_ctx = talloc_new(kdc_socket);
118 struct kdc_reply *rep;
121 const char *src_addr;
123 struct sockaddr_in src_sock_addr;
124 struct ipv4_addr addr;
127 status = socket_pending(kdc_socket->sock, &dsize);
128 if (!NT_STATUS_IS_OK(status)) {
129 talloc_free(tmp_ctx);
133 blob = data_blob_talloc(kdc_socket, NULL, dsize);
134 if (blob.data == NULL) {
135 /* hope this is a temporary low memory condition */
136 talloc_free(tmp_ctx);
140 status = socket_recvfrom(kdc_socket->sock, blob.data, blob.length, &nread, 0,
141 &src_addr, &src_port);
142 if (!NT_STATUS_IS_OK(status)) {
143 talloc_free(tmp_ctx);
146 talloc_steal(tmp_ctx, src_addr);
149 DEBUG(2,("Received krb5 UDP packet of length %u from %s:%u\n",
150 blob.length, src_addr, (uint16_t)src_port));
152 /* TODO: This really should be in a utility function somewhere */
153 ZERO_STRUCT(src_sock_addr);
154 #ifdef HAVE_SOCK_SIN_LEN
155 src_sock_addr.sin_len = sizeof(src_sock_addr);
157 addr = interpret_addr2(src_addr);
158 src_sock_addr.sin_addr.s_addr = addr.addr;
159 src_sock_addr.sin_port = htons(src_port);
160 src_sock_addr.sin_family = PF_INET;
163 ret = krb5_kdc_process_krb5_request(kdc_socket->kdc->smb_krb5_context->krb5_context,
164 kdc_socket->kdc->config,
165 blob.data, blob.length,
168 (struct sockaddr *)&src_sock_addr);
170 talloc_free(tmp_ctx);
174 /* queue a pending reply */
175 rep = talloc(kdc_socket, struct kdc_reply);
177 krb5_data_free(&reply);
178 talloc_free(tmp_ctx);
181 rep->dest_address = talloc_steal(rep, src_addr);
182 rep->dest_port = src_port;
183 rep->packet = data_blob_talloc(rep, reply.data, reply.length);
184 krb5_data_free(&reply);
186 if (rep->packet.data == NULL) {
188 talloc_free(tmp_ctx);
192 DLIST_ADD_END(kdc_socket->send_queue, rep, struct kdc_reply *);
193 EVENT_FD_WRITEABLE(kdc_socket->fde);
194 talloc_free(tmp_ctx);
198 handle fd events on a KDC socket
200 static void kdc_socket_handler(struct event_context *ev, struct fd_event *fde,
201 uint16_t flags, void *private)
203 struct kdc_socket *kdc_socket = talloc_get_type(private, struct kdc_socket);
204 if (flags & EVENT_FD_WRITE) {
205 kdc_send_handler(kdc_socket);
207 if (flags & EVENT_FD_READ) {
208 kdc_recv_handler(kdc_socket);
212 static void kdc_tcp_terminate_connection(struct kdc_tcp_connection *kdcconn, const char *reason)
214 stream_terminate_connection(kdcconn->conn, reason);
218 called when we get a new connection
220 static void kdc_tcp_accept(struct stream_connection *conn)
222 struct kdc_server *kdc = talloc_get_type(conn->private, struct kdc_server);
223 struct kdc_tcp_connection *kdcconn;
225 kdcconn = talloc_zero(conn, struct kdc_tcp_connection);
227 stream_terminate_connection(conn, "kdc_tcp_accept: out of memory");
230 kdcconn->conn = conn;
232 conn->private = kdcconn;
236 receive some data on a winbind connection
238 static void kdc_tcp_recv(struct stream_connection *conn, uint16_t flags)
240 struct kdc_tcp_connection *kdcconn = talloc_get_type(conn->private, struct kdc_tcp_connection);
241 NTSTATUS status = NT_STATUS_UNSUCCESSFUL;
242 TALLOC_CTX *tmp_ctx = talloc_new(kdcconn);
243 struct data_blob_list_item *rep;
246 const char *src_addr;
248 struct sockaddr_in src_sock_addr;
249 struct ipv4_addr addr;
252 /* avoid recursion, because of half async code */
253 if (kdcconn->processing) {
254 EVENT_FD_NOT_READABLE(conn->event.fde);
258 if (kdcconn->partial.length == 0) {
259 kdcconn->partial = data_blob_talloc(kdcconn, NULL, 4);
260 if (!kdcconn->partial.data) goto nomem;
262 kdcconn->partial_read = 0;
265 /* read in the packet length */
266 if (kdcconn->partial_read < 4) {
267 uint32_t packet_length;
269 status = socket_recv(conn->socket,
270 kdcconn->partial.data + kdcconn->partial_read,
271 4 - kdcconn->partial_read,
273 if (NT_STATUS_IS_ERR(status)) goto failed;
274 if (!NT_STATUS_IS_OK(status)) return;
276 kdcconn->partial_read += nread;
277 if (kdcconn->partial_read != 4) return;
279 packet_length = RIVAL(kdcconn->partial.data, 0) + 4;
281 kdcconn->partial.data = talloc_realloc(kdcconn, kdcconn->partial.data,
282 uint8_t, packet_length);
283 if (!kdcconn->partial.data) goto nomem;
285 kdcconn->partial.length = packet_length;
288 /* read in the body */
289 status = socket_recv(conn->socket,
290 kdcconn->partial.data + kdcconn->partial_read,
291 kdcconn->partial.length - kdcconn->partial_read,
293 if (NT_STATUS_IS_ERR(status)) goto failed;
294 if (!NT_STATUS_IS_OK(status)) return;
296 kdcconn->partial_read += nread;
297 if (kdcconn->partial_read != kdcconn->partial.length) return;
300 * we have parsed the request, so we can reset the kdcconn->partial_read,
301 * maybe we could also free kdcconn->partial, but for now we keep it,
302 * and overwrite it the next time
304 kdcconn->partial_read = 0;
306 src_addr = socket_get_peer_addr(kdcconn->conn->socket, tmp_ctx);
307 if (!src_addr) goto nomem;
308 src_port = socket_get_peer_port(kdcconn->conn->socket);
310 DEBUG(2,("Received krb5 TCP packet of length %u from %s:%u\n",
311 kdcconn->partial.length - 4, src_addr, src_port));
313 /* TODO: This really should be in a utility function somewhere */
314 ZERO_STRUCT(src_sock_addr);
315 #ifdef HAVE_SOCK_SIN_LEN
316 src_sock_addr.sin_len = sizeof(src_sock_addr);
318 addr = interpret_addr2(src_addr);
319 src_sock_addr.sin_addr.s_addr = addr.addr;
320 src_sock_addr.sin_port = htons(src_port);
321 src_sock_addr.sin_family = PF_INET;
324 kdcconn->processing = True;
325 ret = krb5_kdc_process_krb5_request(kdcconn->kdc->smb_krb5_context->krb5_context,
326 kdcconn->kdc->config,
327 kdcconn->partial.data + 4, kdcconn->partial.length - 4,
330 (struct sockaddr *)&src_sock_addr);
331 kdcconn->processing = False;
333 status = NT_STATUS_INTERNAL_ERROR;
337 /* and now encode the reply */
338 rep = talloc(kdcconn, struct data_blob_list_item);
340 krb5_data_free(&reply);
344 rep->blob = data_blob_talloc(rep, NULL, reply.length + 4);
345 if (!rep->blob.data) {
346 krb5_data_free(&reply);
350 RSIVAL(rep->blob.data, 0, reply.length);
351 memcpy(rep->blob.data + 4, reply.data, reply.length);
352 krb5_data_free(&reply);
354 if (!kdcconn->send_queue) {
355 EVENT_FD_WRITEABLE(kdcconn->conn->event.fde);
357 DLIST_ADD_END(kdcconn->send_queue, rep, struct data_blob_list_item *);
359 EVENT_FD_READABLE(kdcconn->conn->event.fde);
361 /* the call isn't needed any more */
362 talloc_free(tmp_ctx);
365 status = NT_STATUS_NO_MEMORY;
367 kdc_tcp_terminate_connection(kdcconn, nt_errstr(status));
371 called when we can write to a connection
373 static void kdc_tcp_send(struct stream_connection *conn, uint16_t flags)
375 struct kdc_tcp_connection *kdcconn = talloc_get_type(conn->private, struct kdc_tcp_connection);
378 while (kdcconn->send_queue) {
379 struct data_blob_list_item *q = kdcconn->send_queue;
382 status = socket_send(conn->socket, &q->blob, &sendlen, 0);
383 if (NT_STATUS_IS_ERR(status)) goto failed;
384 if (!NT_STATUS_IS_OK(status)) return;
386 q->blob.length -= sendlen;
387 q->blob.data += sendlen;
389 if (q->blob.length == 0) {
390 DLIST_REMOVE(kdcconn->send_queue, q);
395 EVENT_FD_NOT_WRITEABLE(conn->event.fde);
398 kdc_tcp_terminate_connection(kdcconn, nt_errstr(status));
401 static const struct stream_server_ops kdc_tcp_stream_ops = {
403 .accept_connection = kdc_tcp_accept,
404 .recv_handler = kdc_tcp_recv,
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)
413 const struct model_ops *model_ops;
414 struct kdc_socket *kdc_socket;
416 uint16_t port = lp_krb5_port();
418 kdc_socket = talloc(kdc, struct kdc_socket);
419 NT_STATUS_HAVE_NO_MEMORY(kdc_socket);
421 status = socket_create("ip", SOCKET_TYPE_DGRAM, &kdc_socket->sock, 0);
422 if (!NT_STATUS_IS_OK(status)) {
423 talloc_free(kdc_socket);
427 kdc_socket->kdc = kdc;
428 kdc_socket->send_queue = NULL;
430 talloc_steal(kdc_socket, kdc_socket->sock);
432 kdc_socket->fde = event_add_fd(kdc->task->event_ctx, kdc,
433 socket_get_fd(kdc_socket->sock), EVENT_FD_READ,
434 kdc_socket_handler, kdc_socket);
436 status = socket_listen(kdc_socket->sock, address, port, 0, 0);
437 if (!NT_STATUS_IS_OK(status)) {
438 DEBUG(0,("Failed to bind to %s:%d UDP - %s\n",
439 address, port, nt_errstr(status)));
440 talloc_free(kdc_socket);
444 /* within the kdc task we want to be a single process, so
445 ask for the single process model ops and pass these to the
446 stream_setup_socket() call. */
447 model_ops = process_model_byname("single");
449 DEBUG(0,("Can't find 'single' process model_ops\n"));
450 talloc_free(kdc_socket);
451 return NT_STATUS_INTERNAL_ERROR;
454 status = stream_setup_socket(kdc->task->event_ctx, model_ops, &kdc_tcp_stream_ops,
455 "ip", address, &port, kdc);
456 if (!NT_STATUS_IS_OK(status)) {
457 DEBUG(0,("Failed to bind to %s:%u TCP - %s\n",
458 address, port, nt_errstr(status)));
459 talloc_free(kdc_socket);
468 setup our listening sockets on the configured network interfaces
470 static NTSTATUS kdc_startup_interfaces(struct kdc_server *kdc)
472 int num_interfaces = iface_count();
473 TALLOC_CTX *tmp_ctx = talloc_new(kdc);
476 /* if we are allowing incoming packets from any address, then
477 we need to bind to the wildcard address */
478 if (!lp_bind_interfaces_only()) {
479 status = kdc_add_socket(kdc, "0.0.0.0");
480 NT_STATUS_NOT_OK_RETURN(status);
484 for (i=0; i<num_interfaces; i++) {
485 const char *address = talloc_strdup(tmp_ctx, iface_n_ip(i));
486 status = kdc_add_socket(kdc, address);
487 NT_STATUS_NOT_OK_RETURN(status);
491 talloc_free(tmp_ctx);
499 static void kdc_task_init(struct task_server *task)
501 struct kdc_server *kdc;
505 if (iface_count() == 0) {
506 task_server_terminate(task, "kdc: no network interfaces configured");
510 kdc = talloc(task, struct kdc_server);
512 task_server_terminate(task, "kdc: out of memory");
518 /* Setup the KDC configuration */
519 kdc->config = talloc(kdc, krb5_kdc_configuration);
521 task_server_terminate(task, "kdc: out of memory");
524 krb5_kdc_default_config(kdc->config);
526 /* NAT and the like make this pointless, and painful */
527 kdc->config->check_ticket_addresses = FALSE;
529 initialize_krb5_error_table();
531 ret = smb_krb5_init_context(kdc, &kdc->smb_krb5_context);
533 DEBUG(1,("kdc_task_init: krb5_init_context failed (%s)\n",
534 error_message(ret)));
535 task_server_terminate(task, "kdc: krb5_init_context failed");
539 krb5_add_et_list(kdc->smb_krb5_context->krb5_context, initialize_hdb_error_table_r);
541 kdc->config->logf = kdc->smb_krb5_context->logf;
542 kdc->config->db = talloc(kdc->config, struct HDB *);
543 if (!kdc->config->db) {
544 task_server_terminate(task, "kdc: out of memory");
547 kdc->config->num_db = 1;
549 ret = hdb_ldb_create(kdc, kdc->smb_krb5_context->krb5_context,
550 &kdc->config->db[0], lp_sam_url());
552 DEBUG(1, ("kdc_task_init: hdb_ldb_create fails: %s\n",
553 smb_get_krb5_error_message(kdc->smb_krb5_context->krb5_context, ret, kdc)));
554 task_server_terminate(task, "kdc: hdb_ldb_create failed");
558 /* start listening on the configured network interfaces */
559 status = kdc_startup_interfaces(kdc);
560 if (!NT_STATUS_IS_OK(status)) {
561 task_server_terminate(task, "kdc failed to setup interfaces");
565 irpc_add_name(task->msg_ctx, "kdc_server");
570 called on startup of the KDC service
572 static NTSTATUS kdc_init(struct event_context *event_ctx,
573 const struct model_ops *model_ops)
575 return task_server_startup(event_ctx, model_ops, kdc_task_init);
578 /* called at smbd startup - register ourselves as a server service */
579 NTSTATUS server_service_kdc_init(void)
581 return register_server_service("kdc", kdc_init);