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 "lib/tsocket/tsocket.h"
32 #include "libcli/util/tstream.h"
33 #include "system/network.h"
34 #include "../lib/util/dlinklist.h"
35 #include "lib/messaging/irpc.h"
36 #include "lib/stream/packet.h"
37 #include "librpc/gen_ndr/samr.h"
38 #include "librpc/gen_ndr/ndr_irpc.h"
39 #include "librpc/gen_ndr/ndr_krb5pac.h"
40 #include "lib/socket/netif.h"
41 #include "param/param.h"
43 #include "librpc/gen_ndr/ndr_misc.h"
46 /* Disgusting hack to get a mem_ctx and lp_ctx into the hdb plugin, when
48 TALLOC_CTX *hdb_samba4_mem_ctx;
49 struct tevent_context *hdb_samba4_ev_ctx;
50 struct loadparm_context *hdb_samba4_lp_ctx;
51 extern struct krb5plugin_windc_ftable windc_plugin_table;
52 extern struct hdb_method hdb_samba4;
54 typedef bool (*kdc_process_fn_t)(struct kdc_server *kdc,
58 struct tsocket_address *peer_addr,
59 struct tsocket_address *my_addr,
62 /* hold information about one kdc socket */
64 struct kdc_server *kdc;
65 struct tsocket_address *local_address;
66 kdc_process_fn_t process;
70 state of an open tcp connection
72 struct kdc_tcp_connection {
73 /* stream connection we belong to */
74 struct stream_connection *conn;
76 /* the kdc_server the connection belongs to */
77 struct kdc_socket *kdc_socket;
79 struct tstream_context *tstream;
81 struct tevent_queue *send_queue;
84 static void kdc_tcp_terminate_connection(struct kdc_tcp_connection *kdcconn, const char *reason)
86 stream_terminate_connection(kdcconn->conn, reason);
89 static void kdc_tcp_recv(struct stream_connection *conn, uint16_t flags)
91 struct kdc_tcp_connection *kdcconn = talloc_get_type(conn->private_data,
92 struct kdc_tcp_connection);
93 /* this should never be triggered! */
94 kdc_tcp_terminate_connection(kdcconn, "kdc_tcp_recv: called");
97 static void kdc_tcp_send(struct stream_connection *conn, uint16_t flags)
99 struct kdc_tcp_connection *kdcconn = talloc_get_type(conn->private_data,
100 struct kdc_tcp_connection);
101 /* this should never be triggered! */
102 kdc_tcp_terminate_connection(kdcconn, "kdc_tcp_send: called");
106 Wrapper for krb5_kdc_process_krb5_request, converting to/from Samba
110 static bool kdc_process(struct kdc_server *kdc,
114 struct tsocket_address *peer_addr,
115 struct tsocket_address *my_addr,
120 struct sockaddr_storage ss;
122 krb5_data_zero(&k5_reply);
124 krb5_kdc_update_time(NULL);
126 ret = tsocket_address_bsd_sockaddr(peer_addr, (struct sockaddr *) &ss,
127 sizeof(struct sockaddr_storage));
131 pa = tsocket_address_string(peer_addr, mem_ctx);
136 DEBUG(10,("Received KDC packet of length %lu from %s\n",
137 (long)input->length - 4, pa));
139 ret = krb5_kdc_process_krb5_request(kdc->smb_krb5_context->krb5_context,
141 input->data, input->length,
144 (struct sockaddr *) &ss,
147 *reply = data_blob(NULL, 0);
150 if (k5_reply.length) {
151 *reply = data_blob_talloc(mem_ctx, k5_reply.data, k5_reply.length);
152 krb5_data_free(&k5_reply);
154 *reply = data_blob(NULL, 0);
159 struct kdc_tcp_call {
160 struct kdc_tcp_connection *kdc_conn;
164 struct iovec out_iov[2];
167 static void kdc_tcp_call_writev_done(struct tevent_req *subreq);
169 static void kdc_tcp_call_loop(struct tevent_req *subreq)
171 struct kdc_tcp_connection *kdc_conn = tevent_req_callback_data(subreq,
172 struct kdc_tcp_connection);
173 struct kdc_tcp_call *call;
177 call = talloc(kdc_conn, struct kdc_tcp_call);
179 kdc_tcp_terminate_connection(kdc_conn, "kdc_tcp_call_loop: "
180 "no memory for kdc_tcp_call");
183 call->kdc_conn = kdc_conn;
185 status = tstream_read_pdu_blob_recv(subreq,
189 if (!NT_STATUS_IS_OK(status)) {
192 reason = talloc_asprintf(call, "kdc_tcp_call_loop: "
193 "tstream_read_pdu_blob_recv() - %s",
196 reason = nt_errstr(status);
199 kdc_tcp_terminate_connection(kdc_conn, reason);
203 DEBUG(10,("Received krb5 TCP packet of length %lu from %s\n",
204 (long) call->in.length,
205 tsocket_address_string(kdc_conn->conn->remote_address, call)));
207 /* skip length header */
209 call->in.length -= 4;
212 ok = kdc_conn->kdc_socket->process(kdc_conn->kdc_socket->kdc,
216 kdc_conn->conn->remote_address,
217 kdc_conn->conn->local_address,
220 kdc_tcp_terminate_connection(kdc_conn,
221 "kdc_tcp_call_loop: process function failed");
225 /* First add the length of the out buffer */
226 RSIVAL(call->out_hdr, 0, call->out.length);
227 call->out_iov[0].iov_base = call->out_hdr;
228 call->out_iov[0].iov_len = 4;
230 call->out_iov[1].iov_base = call->out.data;
231 call->out_iov[1].iov_len = call->out.length;
233 subreq = tstream_writev_queue_send(call,
234 kdc_conn->conn->event.ctx,
236 kdc_conn->send_queue,
238 if (subreq == NULL) {
239 kdc_tcp_terminate_connection(kdc_conn, "kdc_tcp_call_loop: "
240 "no memory for tstream_writev_queue_send");
243 tevent_req_set_callback(subreq, kdc_tcp_call_writev_done, call);
246 * The krb5 tcp pdu's has the length as 4 byte (initial_read_size),
247 * packet_full_request_u32 provides the pdu length then.
249 subreq = tstream_read_pdu_blob_send(kdc_conn,
250 kdc_conn->conn->event.ctx,
252 4, /* initial_read_size */
253 packet_full_request_u32,
255 if (subreq == NULL) {
256 kdc_tcp_terminate_connection(kdc_conn, "kdc_tcp_call_loop: "
257 "no memory for tstream_read_pdu_blob_send");
260 tevent_req_set_callback(subreq, kdc_tcp_call_loop, kdc_conn);
263 static void kdc_tcp_call_writev_done(struct tevent_req *subreq)
265 struct kdc_tcp_call *call = tevent_req_callback_data(subreq,
266 struct kdc_tcp_call);
270 rc = tstream_writev_queue_recv(subreq, &sys_errno);
275 reason = talloc_asprintf(call, "kdc_tcp_call_writev_done: "
276 "tstream_writev_queue_recv() - %d:%s",
277 sys_errno, strerror(sys_errno));
279 reason = "kdc_tcp_call_writev_done: tstream_writev_queue_recv() failed";
282 kdc_tcp_terminate_connection(call->kdc_conn, reason);
286 /* We don't care about errors */
292 called when we get a new connection
294 static void kdc_tcp_accept(struct stream_connection *conn)
296 struct kdc_socket *kdc_socket;
297 struct kdc_tcp_connection *kdc_conn;
298 struct tevent_req *subreq;
301 kdc_conn = talloc_zero(conn, struct kdc_tcp_connection);
302 if (kdc_conn == NULL) {
303 stream_terminate_connection(conn,
304 "kdc_tcp_accept: out of memory");
308 kdc_conn->send_queue = tevent_queue_create(conn, "kdc_tcp_accept");
309 if (kdc_conn->send_queue == NULL) {
310 stream_terminate_connection(conn,
311 "kdc_tcp_accept: out of memory");
315 kdc_socket = talloc_get_type(conn->private_data, struct kdc_socket);
317 TALLOC_FREE(conn->event.fde);
319 rc = tstream_bsd_existing_socket(kdc_conn->tstream,
320 socket_get_fd(conn->socket),
323 stream_terminate_connection(conn,
324 "kdc_tcp_accept: out of memory");
328 kdc_conn->conn = conn;
329 kdc_conn->kdc_socket = kdc_socket;
330 conn->private_data = kdc_conn;
333 * The krb5 tcp pdu's has the length as 4 byte (initial_read_size),
334 * packet_full_request_u32 provides the pdu length then.
336 subreq = tstream_read_pdu_blob_send(kdc_conn,
337 kdc_conn->conn->event.ctx,
339 4, /* initial_read_size */
340 packet_full_request_u32,
342 if (subreq == NULL) {
343 kdc_tcp_terminate_connection(kdc_conn, "kdc_tcp_accept: "
344 "no memory for tstream_read_pdu_blob_send");
347 tevent_req_set_callback(subreq, kdc_tcp_call_loop, kdc_conn);
350 static const struct stream_server_ops kdc_tcp_stream_ops = {
352 .accept_connection = kdc_tcp_accept,
353 .recv_handler = kdc_tcp_recv,
354 .send_handler = kdc_tcp_send
357 /* hold information about one kdc/kpasswd udp socket */
358 struct kdc_udp_socket {
359 struct kdc_socket *kdc_socket;
360 struct tdgram_context *dgram;
361 struct tevent_queue *send_queue;
364 struct kdc_udp_call {
365 struct tsocket_address *src;
370 static void kdc_udp_call_sendto_done(struct tevent_req *subreq);
372 static void kdc_udp_call_loop(struct tevent_req *subreq)
374 struct kdc_udp_socket *sock = tevent_req_callback_data(subreq,
375 struct kdc_udp_socket);
376 struct kdc_udp_call *call;
382 call = talloc(sock, struct kdc_udp_call);
388 len = tdgram_recvfrom_recv(subreq, &sys_errno,
389 call, &buf, &call->src);
397 call->in.length = len;
399 DEBUG(10,("Received krb5 UDP packet of length %lu from %s\n",
400 (long)call->in.length,
401 tsocket_address_string(call->src, call)));
404 ok = sock->kdc_socket->process(sock->kdc_socket->kdc,
409 sock->kdc_socket->local_address,
416 subreq = tdgram_sendto_queue_send(call,
417 sock->kdc_socket->kdc->task->event_ctx,
423 if (subreq == NULL) {
427 tevent_req_set_callback(subreq, kdc_udp_call_sendto_done, call);
430 subreq = tdgram_recvfrom_send(sock,
431 sock->kdc_socket->kdc->task->event_ctx,
433 if (subreq == NULL) {
434 task_server_terminate(sock->kdc_socket->kdc->task,
435 "no memory for tdgram_recvfrom_send",
439 tevent_req_set_callback(subreq, kdc_udp_call_loop, sock);
442 static void kdc_udp_call_sendto_done(struct tevent_req *subreq)
444 struct kdc_udp_call *call = tevent_req_callback_data(subreq,
445 struct kdc_udp_call);
449 ret = tdgram_sendto_queue_recv(subreq, &sys_errno);
451 /* We don't care about errors */
457 start listening on the given address
459 static NTSTATUS kdc_add_socket(struct kdc_server *kdc,
460 const struct model_ops *model_ops,
464 kdc_process_fn_t process)
466 struct kdc_socket *kdc_socket;
467 struct kdc_udp_socket *kdc_udp_socket;
468 struct tevent_req *udpsubreq;
472 kdc_socket = talloc(kdc, struct kdc_socket);
473 NT_STATUS_HAVE_NO_MEMORY(kdc_socket);
475 kdc_socket->kdc = kdc;
476 kdc_socket->process = process;
478 ret = tsocket_address_inet_from_strings(kdc_socket, "ip",
480 &kdc_socket->local_address);
482 status = map_nt_error_from_unix(errno);
486 status = stream_setup_socket(kdc->task->event_ctx,
490 "ip", address, &port,
491 lp_socket_options(kdc->task->lp_ctx),
493 if (!NT_STATUS_IS_OK(status)) {
494 DEBUG(0,("Failed to bind to %s:%u TCP - %s\n",
495 address, port, nt_errstr(status)));
496 talloc_free(kdc_socket);
500 kdc_udp_socket = talloc(kdc_socket, struct kdc_udp_socket);
501 NT_STATUS_HAVE_NO_MEMORY(kdc_udp_socket);
503 kdc_udp_socket->kdc_socket = kdc_socket;
505 ret = tdgram_inet_udp_socket(kdc_socket->local_address,
508 &kdc_udp_socket->dgram);
510 status = map_nt_error_from_unix(errno);
511 DEBUG(0,("Failed to bind to %s:%u UDP - %s\n",
512 address, port, nt_errstr(status)));
516 kdc_udp_socket->send_queue = tevent_queue_create(kdc_udp_socket,
517 "kdc_udp_send_queue");
518 NT_STATUS_HAVE_NO_MEMORY(kdc_udp_socket->send_queue);
520 udpsubreq = tdgram_recvfrom_send(kdc_udp_socket,
521 kdc->task->event_ctx,
522 kdc_udp_socket->dgram);
523 NT_STATUS_HAVE_NO_MEMORY(udpsubreq);
524 tevent_req_set_callback(udpsubreq, kdc_udp_call_loop, kdc_udp_socket);
531 setup our listening sockets on the configured network interfaces
533 static NTSTATUS kdc_startup_interfaces(struct kdc_server *kdc, struct loadparm_context *lp_ctx,
534 struct interface *ifaces)
536 const struct model_ops *model_ops;
538 TALLOC_CTX *tmp_ctx = talloc_new(kdc);
542 /* within the kdc task we want to be a single process, so
543 ask for the single process model ops and pass these to the
544 stream_setup_socket() call. */
545 model_ops = process_model_startup(kdc->task->event_ctx, "single");
547 DEBUG(0,("Can't find 'single' process model_ops\n"));
548 return NT_STATUS_INTERNAL_ERROR;
551 num_interfaces = iface_count(ifaces);
553 for (i=0; i<num_interfaces; i++) {
554 const char *address = talloc_strdup(tmp_ctx, iface_n_ip(ifaces, i));
555 uint16_t kdc_port = lp_krb5_port(lp_ctx);
556 uint16_t kpasswd_port = lp_kpasswd_port(lp_ctx);
559 status = kdc_add_socket(kdc, model_ops,
560 "kdc", address, kdc_port,
562 NT_STATUS_NOT_OK_RETURN(status);
566 status = kdc_add_socket(kdc, model_ops,
567 "kpasswd", address, kpasswd_port,
569 NT_STATUS_NOT_OK_RETURN(status);
573 talloc_free(tmp_ctx);
579 static NTSTATUS kdc_check_generic_kerberos(struct irpc_message *msg,
580 struct kdc_check_generic_kerberos *r)
582 struct PAC_Validate pac_validate;
584 struct PAC_SIGNATURE_DATA kdc_sig;
585 struct kdc_server *kdc = talloc_get_type(msg->private_data, struct kdc_server);
586 enum ndr_err_code ndr_err;
590 krb5_principal principal;
591 krb5_keyblock keyblock;
594 /* There is no reply to this request */
595 r->out.generic_reply = data_blob(NULL, 0);
597 ndr_err = ndr_pull_struct_blob(&r->in.generic_request, msg,
598 lp_iconv_convenience(kdc->task->lp_ctx),
600 (ndr_pull_flags_fn_t)ndr_pull_PAC_Validate);
601 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
602 return NT_STATUS_INVALID_PARAMETER;
605 if (pac_validate.MessageType != 3) {
606 /* We don't implement any other message types - such as certificate validation - yet */
607 return NT_STATUS_INVALID_PARAMETER;
610 if (pac_validate.ChecksumAndSignature.length != (pac_validate.ChecksumLength + pac_validate.SignatureLength)
611 || pac_validate.ChecksumAndSignature.length < pac_validate.ChecksumLength
612 || pac_validate.ChecksumAndSignature.length < pac_validate.SignatureLength ) {
613 return NT_STATUS_INVALID_PARAMETER;
616 srv_sig = data_blob_const(pac_validate.ChecksumAndSignature.data,
617 pac_validate.ChecksumLength);
619 if (pac_validate.SignatureType == CKSUMTYPE_HMAC_MD5) {
620 etype = ETYPE_ARCFOUR_HMAC_MD5;
622 ret = krb5_cksumtype_to_enctype(kdc->smb_krb5_context->krb5_context, pac_validate.SignatureType,
625 return NT_STATUS_LOGON_FAILURE;
629 ret = krb5_make_principal(kdc->smb_krb5_context->krb5_context, &principal,
630 lp_realm(kdc->task->lp_ctx),
631 "krbtgt", lp_realm(kdc->task->lp_ctx),
635 return NT_STATUS_NO_MEMORY;
638 ret = kdc->config->db[0]->hdb_fetch(kdc->smb_krb5_context->krb5_context,
641 HDB_F_GET_KRBTGT | HDB_F_DECRYPT,
645 hdb_free_entry(kdc->smb_krb5_context->krb5_context, &ent);
646 krb5_free_principal(kdc->smb_krb5_context->krb5_context, principal);
648 return NT_STATUS_LOGON_FAILURE;
651 ret = hdb_enctype2key(kdc->smb_krb5_context->krb5_context, &ent.entry, etype, &key);
654 hdb_free_entry(kdc->smb_krb5_context->krb5_context, &ent);
655 krb5_free_principal(kdc->smb_krb5_context->krb5_context, principal);
656 return NT_STATUS_LOGON_FAILURE;
661 kdc_sig.type = pac_validate.SignatureType;
662 kdc_sig.signature = data_blob_const(&pac_validate.ChecksumAndSignature.data[pac_validate.ChecksumLength],
663 pac_validate.SignatureLength);
664 ret = check_pac_checksum(msg, srv_sig, &kdc_sig,
665 kdc->smb_krb5_context->krb5_context, &keyblock);
667 hdb_free_entry(kdc->smb_krb5_context->krb5_context, &ent);
668 krb5_free_principal(kdc->smb_krb5_context->krb5_context, principal);
671 return NT_STATUS_LOGON_FAILURE;
681 static void kdc_task_init(struct task_server *task)
683 struct kdc_server *kdc;
686 struct interface *ifaces;
688 switch (lp_server_role(task->lp_ctx)) {
689 case ROLE_STANDALONE:
690 task_server_terminate(task, "kdc: no KDC required in standalone configuration", false);
692 case ROLE_DOMAIN_MEMBER:
693 task_server_terminate(task, "kdc: no KDC required in member server configuration", false);
695 case ROLE_DOMAIN_CONTROLLER:
696 /* Yes, we want a KDC */
700 load_interfaces(task, lp_interfaces(task->lp_ctx), &ifaces);
702 if (iface_count(ifaces) == 0) {
703 task_server_terminate(task, "kdc: no network interfaces configured", false);
707 task_server_set_title(task, "task[kdc]");
709 kdc = talloc(task, struct kdc_server);
711 task_server_terminate(task, "kdc: out of memory", true);
717 initialize_krb5_error_table();
719 ret = smb_krb5_init_context(kdc, task->event_ctx, task->lp_ctx, &kdc->smb_krb5_context);
721 DEBUG(1,("kdc_task_init: krb5_init_context failed (%s)\n",
722 error_message(ret)));
723 task_server_terminate(task, "kdc: krb5_init_context failed", true);
727 krb5_add_et_list(kdc->smb_krb5_context->krb5_context, initialize_hdb_error_table_r);
729 ret = krb5_kdc_get_config(kdc->smb_krb5_context->krb5_context,
732 task_server_terminate(task, "kdc: failed to get KDC configuration", true);
736 kdc->config->logf = kdc->smb_krb5_context->logf;
737 kdc->config->db = talloc(kdc, struct HDB *);
738 if (!kdc->config->db) {
739 task_server_terminate(task, "kdc: out of memory", true);
742 kdc->config->num_db = 1;
744 /* Register hdb-samba4 hooks for use as a keytab */
746 kdc->base_ctx = talloc_zero(kdc, struct samba_kdc_base_context);
747 if (!kdc->base_ctx) {
748 task_server_terminate(task, "kdc: out of memory", true);
752 kdc->base_ctx->ev_ctx = task->event_ctx;
753 kdc->base_ctx->lp_ctx = task->lp_ctx;
755 status = hdb_samba4_create_kdc(kdc->base_ctx,
756 kdc->smb_krb5_context->krb5_context,
757 &kdc->config->db[0]);
758 if (!NT_STATUS_IS_OK(status)) {
759 task_server_terminate(task, "kdc: hdb_samba4_create_kdc (setup KDC database) failed", true);
763 ret = krb5_plugin_register(kdc->smb_krb5_context->krb5_context,
764 PLUGIN_TYPE_DATA, "hdb",
767 task_server_terminate(task, "kdc: failed to register hdb plugin", true);
771 ret = krb5_kt_register(kdc->smb_krb5_context->krb5_context, &hdb_kt_ops);
773 task_server_terminate(task, "kdc: failed to register keytab plugin", true);
777 /* Register WinDC hooks */
778 ret = krb5_plugin_register(kdc->smb_krb5_context->krb5_context,
779 PLUGIN_TYPE_DATA, "windc",
780 &windc_plugin_table);
782 task_server_terminate(task, "kdc: failed to register windc plugin", true);
786 krb5_kdc_windc_init(kdc->smb_krb5_context->krb5_context);
788 /* start listening on the configured network interfaces */
789 status = kdc_startup_interfaces(kdc, task->lp_ctx, ifaces);
790 if (!NT_STATUS_IS_OK(status)) {
791 task_server_terminate(task, "kdc failed to setup interfaces", true);
795 status = IRPC_REGISTER(task->msg_ctx, irpc, KDC_CHECK_GENERIC_KERBEROS,
796 kdc_check_generic_kerberos, kdc);
797 if (!NT_STATUS_IS_OK(status)) {
798 task_server_terminate(task, "nbtd failed to setup monitoring", true);
802 irpc_add_name(task->msg_ctx, "kdc_server");
806 /* called at smbd startup - register ourselves as a server service */
807 NTSTATUS server_service_kdc_init(void)
809 return register_server_service("kdc", kdc_task_init);