2 Unix SMB/CIFS implementation.
6 Copyright (C) Andrew Bartlett <abartlet@samba.org> 2005-2008
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"
31 #include "system/network.h"
32 #include "../lib/util/dlinklist.h"
33 #include "lib/messaging/irpc.h"
34 #include "lib/stream/packet.h"
35 #include "librpc/gen_ndr/samr.h"
36 #include "librpc/gen_ndr/ndr_irpc.h"
37 #include "librpc/gen_ndr/ndr_krb5pac.h"
38 #include "lib/socket/netif.h"
39 #include "param/param.h"
41 #include "librpc/gen_ndr/ndr_misc.h"
44 /* Disgusting hack to get a mem_ctx and lp_ctx into the hdb plugin, when
46 TALLOC_CTX *kdc_mem_ctx;
47 struct event_context *kdc_ev_ctx;
48 struct loadparm_context *kdc_lp_ctx;
50 /* hold all the info needed to send a reply */
52 struct kdc_reply *next, *prev;
53 struct socket_address *dest;
57 typedef bool (*kdc_process_fn_t)(struct kdc_server *kdc,
61 struct socket_address *peer_addr,
62 struct socket_address *my_addr,
65 /* hold information about one kdc socket */
67 struct socket_context *sock;
68 struct kdc_server *kdc;
71 /* a queue of outgoing replies that have been deferred */
72 struct kdc_reply *send_queue;
74 kdc_process_fn_t process;
77 state of an open tcp connection
79 struct kdc_tcp_connection {
80 /* stream connection we belong to */
81 struct stream_connection *conn;
83 /* the kdc_server the connection belongs to */
84 struct kdc_server *kdc;
86 struct packet_context *packet;
88 kdc_process_fn_t process;
92 handle fd send events on a KDC socket
94 static void kdc_send_handler(struct kdc_socket *kdc_socket)
96 while (kdc_socket->send_queue) {
97 struct kdc_reply *rep = kdc_socket->send_queue;
101 status = socket_sendto(kdc_socket->sock, &rep->packet, &sendlen,
103 if (NT_STATUS_EQUAL(status, STATUS_MORE_ENTRIES)) {
106 if (NT_STATUS_EQUAL(status, NT_STATUS_INVALID_BUFFER_SIZE)) {
107 /* Replace with a krb err, response to big */
110 DLIST_REMOVE(kdc_socket->send_queue, rep);
114 if (kdc_socket->send_queue == NULL) {
115 EVENT_FD_NOT_WRITEABLE(kdc_socket->fde);
121 handle fd recv events on a KDC socket
123 static void kdc_recv_handler(struct kdc_socket *kdc_socket)
126 TALLOC_CTX *tmp_ctx = talloc_new(kdc_socket);
128 struct kdc_reply *rep;
131 struct socket_address *src;
132 struct socket_address *my_addr;
135 status = socket_pending(kdc_socket->sock, &dsize);
136 if (!NT_STATUS_IS_OK(status)) {
137 talloc_free(tmp_ctx);
141 blob = data_blob_talloc(tmp_ctx, NULL, dsize);
142 if (blob.data == NULL) {
143 /* hope this is a temporary low memory condition */
144 talloc_free(tmp_ctx);
148 status = socket_recvfrom(kdc_socket->sock, blob.data, blob.length, &nread,
150 if (!NT_STATUS_IS_OK(status)) {
151 talloc_free(tmp_ctx);
156 DEBUG(10,("Received krb5 UDP packet of length %lu from %s:%u\n",
157 (long)blob.length, src->addr, (uint16_t)src->port));
159 my_addr = socket_get_my_addr(kdc_socket->sock, tmp_ctx);
161 talloc_free(tmp_ctx);
167 ret = kdc_socket->process(kdc_socket->kdc,
174 talloc_free(tmp_ctx);
178 /* queue a pending reply */
179 rep = talloc(kdc_socket, struct kdc_reply);
181 talloc_free(tmp_ctx);
184 rep->dest = talloc_steal(rep, src);
186 talloc_steal(rep, reply.data);
188 if (rep->packet.data == NULL) {
190 talloc_free(tmp_ctx);
194 DLIST_ADD_END(kdc_socket->send_queue, rep, struct kdc_reply *);
195 EVENT_FD_WRITEABLE(kdc_socket->fde);
196 talloc_free(tmp_ctx);
200 handle fd events on a KDC socket
202 static void kdc_socket_handler(struct event_context *ev, struct fd_event *fde,
203 uint16_t flags, void *private)
205 struct kdc_socket *kdc_socket = talloc_get_type(private, struct kdc_socket);
206 if (flags & EVENT_FD_WRITE) {
207 kdc_send_handler(kdc_socket);
209 if (flags & EVENT_FD_READ) {
210 kdc_recv_handler(kdc_socket);
214 static void kdc_tcp_terminate_connection(struct kdc_tcp_connection *kdcconn, const char *reason)
216 stream_terminate_connection(kdcconn->conn, reason);
220 receive a full packet on a KDC connection
222 static NTSTATUS kdc_tcp_recv(void *private, DATA_BLOB blob)
224 struct kdc_tcp_connection *kdcconn = talloc_get_type(private,
225 struct kdc_tcp_connection);
226 NTSTATUS status = NT_STATUS_UNSUCCESSFUL;
227 TALLOC_CTX *tmp_ctx = talloc_new(kdcconn);
229 DATA_BLOB input, reply;
230 struct socket_address *src_addr;
231 struct socket_address *my_addr;
233 talloc_steal(tmp_ctx, blob.data);
235 src_addr = socket_get_peer_addr(kdcconn->conn->socket, tmp_ctx);
237 talloc_free(tmp_ctx);
238 return NT_STATUS_NO_MEMORY;
241 my_addr = socket_get_my_addr(kdcconn->conn->socket, tmp_ctx);
243 talloc_free(tmp_ctx);
244 return NT_STATUS_NO_MEMORY;
248 input = data_blob_const(blob.data + 4, blob.length - 4);
250 ret = kdcconn->process(kdcconn->kdc,
256 0 /* Not datagram */);
258 talloc_free(tmp_ctx);
259 return NT_STATUS_INTERNAL_ERROR;
262 /* and now encode the reply */
263 blob = data_blob_talloc(kdcconn, NULL, reply.length + 4);
265 talloc_free(tmp_ctx);
266 return NT_STATUS_NO_MEMORY;
269 RSIVAL(blob.data, 0, reply.length);
270 memcpy(blob.data + 4, reply.data, reply.length);
272 status = packet_send(kdcconn->packet, blob);
273 if (!NT_STATUS_IS_OK(status)) {
274 talloc_free(tmp_ctx);
278 /* the call isn't needed any more */
279 talloc_free(tmp_ctx);
284 receive some data on a KDC connection
286 static void kdc_tcp_recv_handler(struct stream_connection *conn, uint16_t flags)
288 struct kdc_tcp_connection *kdcconn = talloc_get_type(conn->private,
289 struct kdc_tcp_connection);
290 packet_recv(kdcconn->packet);
294 called on a tcp recv error
296 static void kdc_tcp_recv_error(void *private, NTSTATUS status)
298 struct kdc_tcp_connection *kdcconn = talloc_get_type(private, struct kdc_tcp_connection);
299 kdc_tcp_terminate_connection(kdcconn, nt_errstr(status));
303 called when we can write to a connection
305 static void kdc_tcp_send(struct stream_connection *conn, uint16_t flags)
307 struct kdc_tcp_connection *kdcconn = talloc_get_type(conn->private,
308 struct kdc_tcp_connection);
309 packet_queue_run(kdcconn->packet);
313 Wrapper for krb5_kdc_process_krb5_request, converting to/from Samba
317 static bool kdc_process(struct kdc_server *kdc,
321 struct socket_address *peer_addr,
322 struct socket_address *my_addr,
327 krb5_data_zero(&k5_reply);
329 krb5_kdc_update_time(NULL);
331 DEBUG(10,("Received KDC packet of length %lu from %s:%d\n",
332 (long)input->length - 4, peer_addr->addr, peer_addr->port));
334 ret = krb5_kdc_process_krb5_request(kdc->smb_krb5_context->krb5_context,
336 input->data, input->length,
342 *reply = data_blob(NULL, 0);
345 if (k5_reply.length) {
346 *reply = data_blob_talloc(mem_ctx, k5_reply.data, k5_reply.length);
347 krb5_free_data_contents(kdc->smb_krb5_context->krb5_context, &k5_reply);
349 *reply = data_blob(NULL, 0);
355 called when we get a new connection
357 static void kdc_tcp_generic_accept(struct stream_connection *conn, kdc_process_fn_t process_fn)
359 struct kdc_server *kdc = talloc_get_type(conn->private, struct kdc_server);
360 struct kdc_tcp_connection *kdcconn;
362 kdcconn = talloc_zero(conn, struct kdc_tcp_connection);
364 stream_terminate_connection(conn, "kdc_tcp_accept: out of memory");
367 kdcconn->conn = conn;
369 kdcconn->process = process_fn;
370 conn->private = kdcconn;
372 kdcconn->packet = packet_init(kdcconn);
373 if (kdcconn->packet == NULL) {
374 kdc_tcp_terminate_connection(kdcconn, "kdc_tcp_accept: out of memory");
377 packet_set_private(kdcconn->packet, kdcconn);
378 packet_set_socket(kdcconn->packet, conn->socket);
379 packet_set_callback(kdcconn->packet, kdc_tcp_recv);
380 packet_set_full_request(kdcconn->packet, packet_full_request_u32);
381 packet_set_error_handler(kdcconn->packet, kdc_tcp_recv_error);
382 packet_set_event_context(kdcconn->packet, conn->event.ctx);
383 packet_set_fde(kdcconn->packet, conn->event.fde);
384 packet_set_serialise(kdcconn->packet);
387 static void kdc_tcp_accept(struct stream_connection *conn)
389 kdc_tcp_generic_accept(conn, kdc_process);
392 static const struct stream_server_ops kdc_tcp_stream_ops = {
394 .accept_connection = kdc_tcp_accept,
395 .recv_handler = kdc_tcp_recv_handler,
396 .send_handler = kdc_tcp_send
399 static void kpasswdd_tcp_accept(struct stream_connection *conn)
401 kdc_tcp_generic_accept(conn, kpasswdd_process);
404 static const struct stream_server_ops kpasswdd_tcp_stream_ops = {
405 .name = "kpasswdd_tcp",
406 .accept_connection = kpasswdd_tcp_accept,
407 .recv_handler = kdc_tcp_recv_handler,
408 .send_handler = kdc_tcp_send
412 start listening on the given address
414 static NTSTATUS kdc_add_socket(struct kdc_server *kdc, const char *address,
415 uint16_t kdc_port, uint16_t kpasswd_port)
417 const struct model_ops *model_ops;
418 struct kdc_socket *kdc_socket;
419 struct kdc_socket *kpasswd_socket;
420 struct socket_address *kdc_address, *kpasswd_address;
423 kdc_socket = talloc(kdc, struct kdc_socket);
424 NT_STATUS_HAVE_NO_MEMORY(kdc_socket);
426 kpasswd_socket = talloc(kdc, struct kdc_socket);
427 NT_STATUS_HAVE_NO_MEMORY(kpasswd_socket);
429 status = socket_create("ip", SOCKET_TYPE_DGRAM, &kdc_socket->sock, 0);
430 if (!NT_STATUS_IS_OK(status)) {
431 talloc_free(kdc_socket);
435 status = socket_create("ip", SOCKET_TYPE_DGRAM, &kpasswd_socket->sock, 0);
436 if (!NT_STATUS_IS_OK(status)) {
437 talloc_free(kpasswd_socket);
441 kdc_socket->kdc = kdc;
442 kdc_socket->send_queue = NULL;
443 kdc_socket->process = kdc_process;
445 talloc_steal(kdc_socket, kdc_socket->sock);
447 kdc_socket->fde = event_add_fd(kdc->task->event_ctx, kdc,
448 socket_get_fd(kdc_socket->sock), EVENT_FD_READ,
449 kdc_socket_handler, kdc_socket);
451 kdc_address = socket_address_from_strings(kdc_socket, kdc_socket->sock->backend_name,
453 NT_STATUS_HAVE_NO_MEMORY(kdc_address);
455 status = socket_listen(kdc_socket->sock, kdc_address, 0, 0);
456 if (!NT_STATUS_IS_OK(status)) {
457 DEBUG(0,("Failed to bind to %s:%d UDP for kdc - %s\n",
458 address, kdc_port, nt_errstr(status)));
459 talloc_free(kdc_socket);
463 kpasswd_socket->kdc = kdc;
464 kpasswd_socket->send_queue = NULL;
465 kpasswd_socket->process = kpasswdd_process;
467 talloc_steal(kpasswd_socket, kpasswd_socket->sock);
469 kpasswd_socket->fde = event_add_fd(kdc->task->event_ctx, kdc,
470 socket_get_fd(kpasswd_socket->sock), EVENT_FD_READ,
471 kdc_socket_handler, kpasswd_socket);
473 kpasswd_address = socket_address_from_strings(kpasswd_socket, kpasswd_socket->sock->backend_name,
474 address, kpasswd_port);
475 NT_STATUS_HAVE_NO_MEMORY(kpasswd_address);
477 status = socket_listen(kpasswd_socket->sock, kpasswd_address, 0, 0);
478 if (!NT_STATUS_IS_OK(status)) {
479 DEBUG(0,("Failed to bind to %s:%d UDP for kpasswd - %s\n",
480 address, kpasswd_port, nt_errstr(status)));
481 talloc_free(kpasswd_socket);
485 /* within the kdc task we want to be a single process, so
486 ask for the single process model ops and pass these to the
487 stream_setup_socket() call. */
488 model_ops = process_model_startup(kdc->task->event_ctx, "single");
490 DEBUG(0,("Can't find 'single' process model_ops\n"));
491 talloc_free(kdc_socket);
492 return NT_STATUS_INTERNAL_ERROR;
495 status = stream_setup_socket(kdc->task->event_ctx,
499 "ip", address, &kdc_port,
500 lp_socket_options(kdc->task->lp_ctx),
502 if (!NT_STATUS_IS_OK(status)) {
503 DEBUG(0,("Failed to bind to %s:%u TCP - %s\n",
504 address, kdc_port, nt_errstr(status)));
505 talloc_free(kdc_socket);
509 status = stream_setup_socket(kdc->task->event_ctx,
512 &kpasswdd_tcp_stream_ops,
513 "ip", address, &kpasswd_port,
514 lp_socket_options(kdc->task->lp_ctx),
516 if (!NT_STATUS_IS_OK(status)) {
517 DEBUG(0,("Failed to bind to %s:%u TCP - %s\n",
518 address, kpasswd_port, nt_errstr(status)));
519 talloc_free(kdc_socket);
528 setup our listening sockets on the configured network interfaces
530 static NTSTATUS kdc_startup_interfaces(struct kdc_server *kdc, struct loadparm_context *lp_ctx,
531 struct interface *ifaces)
534 TALLOC_CTX *tmp_ctx = talloc_new(kdc);
538 num_interfaces = iface_count(ifaces);
540 for (i=0; i<num_interfaces; i++) {
541 const char *address = talloc_strdup(tmp_ctx, iface_n_ip(ifaces, i));
542 status = kdc_add_socket(kdc, address, lp_krb5_port(lp_ctx),
543 lp_kpasswd_port(lp_ctx));
544 NT_STATUS_NOT_OK_RETURN(status);
547 talloc_free(tmp_ctx);
552 static struct krb5plugin_windc_ftable windc_plugin_table = {
553 .minor_version = KRB5_WINDC_PLUGING_MINOR,
554 .init = samba_kdc_plugin_init,
555 .fini = samba_kdc_plugin_fini,
556 .pac_generate = samba_kdc_get_pac,
557 .pac_verify = samba_kdc_reget_pac,
558 .client_access = samba_kdc_check_client_access,
562 static NTSTATUS kdc_check_generic_kerberos(struct irpc_message *msg,
563 struct kdc_check_generic_kerberos *r)
565 struct PAC_Validate pac_validate;
567 struct PAC_SIGNATURE_DATA kdc_sig;
568 struct kdc_server *kdc = talloc_get_type(msg->private, struct kdc_server);
569 enum ndr_err_code ndr_err;
573 krb5_principal principal;
574 krb5_keyblock keyblock;
577 /* There is no reply to this request */
578 r->out.generic_reply = data_blob(NULL, 0);
580 ndr_err = ndr_pull_struct_blob(&r->in.generic_request, msg,
581 lp_iconv_convenience(kdc->task->lp_ctx),
583 (ndr_pull_flags_fn_t)ndr_pull_PAC_Validate);
584 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
585 return NT_STATUS_INVALID_PARAMETER;
588 if (pac_validate.MessageType != 3) {
589 /* We don't implement any other message types - such as certificate validation - yet */
590 return NT_STATUS_INVALID_PARAMETER;
593 if (pac_validate.ChecksumAndSignature.length != (pac_validate.ChecksumLength + pac_validate.SignatureLength)
594 || pac_validate.ChecksumAndSignature.length < pac_validate.ChecksumLength
595 || pac_validate.ChecksumAndSignature.length < pac_validate.SignatureLength ) {
596 return NT_STATUS_INVALID_PARAMETER;
599 srv_sig = data_blob_const(pac_validate.ChecksumAndSignature.data,
600 pac_validate.ChecksumLength);
602 if (pac_validate.SignatureType == CKSUMTYPE_HMAC_MD5) {
603 etype = ETYPE_ARCFOUR_HMAC_MD5;
605 ret = krb5_cksumtype_to_enctype(kdc->smb_krb5_context->krb5_context, pac_validate.SignatureType,
608 return NT_STATUS_LOGON_FAILURE;
612 ret = krb5_make_principal(kdc->smb_krb5_context->krb5_context, &principal,
613 lp_realm(kdc->task->lp_ctx),
614 "krbtgt", lp_realm(kdc->task->lp_ctx),
618 return NT_STATUS_NO_MEMORY;
621 ret = kdc->config->db[0]->hdb_fetch(kdc->smb_krb5_context->krb5_context,
624 HDB_F_GET_KRBTGT | HDB_F_DECRYPT,
628 hdb_free_entry(kdc->smb_krb5_context->krb5_context, &ent);
629 krb5_free_principal(kdc->smb_krb5_context->krb5_context, principal);
631 return NT_STATUS_LOGON_FAILURE;
634 ret = hdb_enctype2key(kdc->smb_krb5_context->krb5_context, &ent.entry, etype, &key);
637 hdb_free_entry(kdc->smb_krb5_context->krb5_context, &ent);
638 krb5_free_principal(kdc->smb_krb5_context->krb5_context, principal);
639 return NT_STATUS_LOGON_FAILURE;
644 kdc_sig.type = pac_validate.SignatureType;
645 kdc_sig.signature = data_blob_const(&pac_validate.ChecksumAndSignature.data[pac_validate.ChecksumLength],
646 pac_validate.SignatureLength);
647 ret = check_pac_checksum(msg, srv_sig, &kdc_sig,
648 kdc->smb_krb5_context->krb5_context, &keyblock);
650 hdb_free_entry(kdc->smb_krb5_context->krb5_context, &ent);
651 krb5_free_principal(kdc->smb_krb5_context->krb5_context, principal);
654 return NT_STATUS_LOGON_FAILURE;
661 static struct hdb_method hdb_samba4 = {
662 .interface_version = HDB_INTERFACE_VERSION,
664 .create = hdb_samba4_create
670 static void kdc_task_init(struct task_server *task)
672 struct kdc_server *kdc;
675 struct interface *ifaces;
677 switch (lp_server_role(task->lp_ctx)) {
678 case ROLE_STANDALONE:
679 task_server_terminate(task, "kdc: no KDC required in standalone configuration");
681 case ROLE_DOMAIN_MEMBER:
682 task_server_terminate(task, "kdc: no KDC required in member server configuration");
684 case ROLE_DOMAIN_CONTROLLER:
685 /* Yes, we want a KDC */
689 load_interfaces(task, lp_interfaces(task->lp_ctx), &ifaces);
691 if (iface_count(ifaces) == 0) {
692 task_server_terminate(task, "kdc: no network interfaces configured");
696 task_server_set_title(task, "task[kdc]");
698 kdc = talloc(task, struct kdc_server);
700 task_server_terminate(task, "kdc: out of memory");
706 initialize_krb5_error_table();
708 ret = smb_krb5_init_context(kdc, task->event_ctx, task->lp_ctx, &kdc->smb_krb5_context);
710 DEBUG(1,("kdc_task_init: krb5_init_context failed (%s)\n",
711 error_message(ret)));
712 task_server_terminate(task, "kdc: krb5_init_context failed");
716 krb5_add_et_list(kdc->smb_krb5_context->krb5_context, initialize_hdb_error_table_r);
718 ret = krb5_kdc_get_config(kdc->smb_krb5_context->krb5_context,
721 task_server_terminate(task, "kdc: failed to get KDC configuration");
725 kdc->config->logf = kdc->smb_krb5_context->logf;
726 kdc->config->db = talloc(kdc, struct HDB *);
727 if (!kdc->config->db) {
728 task_server_terminate(task, "kdc: out of memory");
731 kdc->config->num_db = 1;
733 status = kdc_hdb_samba4_create(kdc, task->event_ctx, task->lp_ctx,
734 kdc->smb_krb5_context->krb5_context,
735 &kdc->config->db[0], NULL);
736 if (!NT_STATUS_IS_OK(status)) {
737 task_server_terminate(task, "kdc: hdb_ldb_create (setup KDC database) failed");
742 /* Register hdb-samba4 hooks */
743 ret = krb5_plugin_register(kdc->smb_krb5_context->krb5_context,
744 PLUGIN_TYPE_DATA, "hdb",
747 task_server_terminate(task, "kdc: failed to register hdb keytab");
751 ret = krb5_kt_register(kdc->smb_krb5_context->krb5_context, &hdb_kt_ops);
753 task_server_terminate(task, "kdc: failed to register hdb keytab");
757 /* Registar WinDC hooks */
758 ret = krb5_plugin_register(kdc->smb_krb5_context->krb5_context,
759 PLUGIN_TYPE_DATA, "windc",
760 &windc_plugin_table);
762 task_server_terminate(task, "kdc: failed to register hdb keytab");
766 krb5_kdc_windc_init(kdc->smb_krb5_context->krb5_context);
768 kdc_mem_ctx = kdc->smb_krb5_context;
769 kdc_ev_ctx = task->event_ctx;
770 kdc_lp_ctx = task->lp_ctx;
772 /* start listening on the configured network interfaces */
773 status = kdc_startup_interfaces(kdc, task->lp_ctx, ifaces);
774 if (!NT_STATUS_IS_OK(status)) {
775 task_server_terminate(task, "kdc failed to setup interfaces");
779 status = IRPC_REGISTER(task->msg_ctx, irpc, KDC_CHECK_GENERIC_KERBEROS,
780 kdc_check_generic_kerberos, kdc);
781 if (!NT_STATUS_IS_OK(status)) {
782 task_server_terminate(task, "nbtd failed to setup monitoring");
786 irpc_add_name(task->msg_ctx, "kdc_server");
790 /* called at smbd startup - register ourselves as a server service */
791 NTSTATUS server_service_kdc_init(void)
793 return register_server_service("kdc", kdc_task_init);