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 extern struct krb5plugin_windc_ftable windc_plugin_table;
47 extern struct hdb_method hdb_samba4;
49 typedef bool (*kdc_process_fn_t)(struct kdc_server *kdc,
53 struct tsocket_address *peer_addr,
54 struct tsocket_address *my_addr,
57 /* hold information about one kdc socket */
59 struct kdc_server *kdc;
60 struct tsocket_address *local_address;
61 kdc_process_fn_t process;
65 state of an open tcp connection
67 struct kdc_tcp_connection {
68 /* stream connection we belong to */
69 struct stream_connection *conn;
71 /* the kdc_server the connection belongs to */
72 struct kdc_socket *kdc_socket;
74 struct tstream_context *tstream;
76 struct tevent_queue *send_queue;
79 static void kdc_tcp_terminate_connection(struct kdc_tcp_connection *kdcconn, const char *reason)
81 stream_terminate_connection(kdcconn->conn, reason);
84 static void kdc_tcp_recv(struct stream_connection *conn, uint16_t flags)
86 struct kdc_tcp_connection *kdcconn = talloc_get_type(conn->private_data,
87 struct kdc_tcp_connection);
88 /* this should never be triggered! */
89 kdc_tcp_terminate_connection(kdcconn, "kdc_tcp_recv: called");
92 static void kdc_tcp_send(struct stream_connection *conn, uint16_t flags)
94 struct kdc_tcp_connection *kdcconn = talloc_get_type(conn->private_data,
95 struct kdc_tcp_connection);
96 /* this should never be triggered! */
97 kdc_tcp_terminate_connection(kdcconn, "kdc_tcp_send: called");
101 Wrapper for krb5_kdc_process_krb5_request, converting to/from Samba
105 static bool kdc_process(struct kdc_server *kdc,
109 struct tsocket_address *peer_addr,
110 struct tsocket_address *my_addr,
115 struct sockaddr_storage ss;
117 krb5_data_zero(&k5_reply);
119 krb5_kdc_update_time(NULL);
121 ret = tsocket_address_bsd_sockaddr(peer_addr, (struct sockaddr *) &ss,
122 sizeof(struct sockaddr_storage));
126 pa = tsocket_address_string(peer_addr, mem_ctx);
131 DEBUG(10,("Received KDC packet of length %lu from %s\n",
132 (long)input->length - 4, pa));
134 ret = krb5_kdc_process_krb5_request(kdc->smb_krb5_context->krb5_context,
136 input->data, input->length,
139 (struct sockaddr *) &ss,
142 *reply = data_blob(NULL, 0);
145 if (k5_reply.length) {
146 *reply = data_blob_talloc(mem_ctx, k5_reply.data, k5_reply.length);
147 krb5_data_free(&k5_reply);
149 *reply = data_blob(NULL, 0);
154 struct kdc_tcp_call {
155 struct kdc_tcp_connection *kdc_conn;
159 struct iovec out_iov[2];
162 static void kdc_tcp_call_writev_done(struct tevent_req *subreq);
164 static void kdc_tcp_call_loop(struct tevent_req *subreq)
166 struct kdc_tcp_connection *kdc_conn = tevent_req_callback_data(subreq,
167 struct kdc_tcp_connection);
168 struct kdc_tcp_call *call;
172 call = talloc(kdc_conn, struct kdc_tcp_call);
174 kdc_tcp_terminate_connection(kdc_conn, "kdc_tcp_call_loop: "
175 "no memory for kdc_tcp_call");
178 call->kdc_conn = kdc_conn;
180 status = tstream_read_pdu_blob_recv(subreq,
184 if (!NT_STATUS_IS_OK(status)) {
187 reason = talloc_asprintf(call, "kdc_tcp_call_loop: "
188 "tstream_read_pdu_blob_recv() - %s",
191 reason = nt_errstr(status);
194 kdc_tcp_terminate_connection(kdc_conn, reason);
198 DEBUG(10,("Received krb5 TCP packet of length %lu from %s\n",
199 (long) call->in.length,
200 tsocket_address_string(kdc_conn->conn->remote_address, call)));
202 /* skip length header */
204 call->in.length -= 4;
207 ok = kdc_conn->kdc_socket->process(kdc_conn->kdc_socket->kdc,
211 kdc_conn->conn->remote_address,
212 kdc_conn->conn->local_address,
215 kdc_tcp_terminate_connection(kdc_conn,
216 "kdc_tcp_call_loop: process function failed");
220 /* First add the length of the out buffer */
221 RSIVAL(call->out_hdr, 0, call->out.length);
222 call->out_iov[0].iov_base = (char *) call->out_hdr;
223 call->out_iov[0].iov_len = 4;
225 call->out_iov[1].iov_base = (char *) call->out.data;
226 call->out_iov[1].iov_len = call->out.length;
228 subreq = tstream_writev_queue_send(call,
229 kdc_conn->conn->event.ctx,
231 kdc_conn->send_queue,
233 if (subreq == NULL) {
234 kdc_tcp_terminate_connection(kdc_conn, "kdc_tcp_call_loop: "
235 "no memory for tstream_writev_queue_send");
238 tevent_req_set_callback(subreq, kdc_tcp_call_writev_done, call);
241 * The krb5 tcp pdu's has the length as 4 byte (initial_read_size),
242 * packet_full_request_u32 provides the pdu length then.
244 subreq = tstream_read_pdu_blob_send(kdc_conn,
245 kdc_conn->conn->event.ctx,
247 4, /* initial_read_size */
248 packet_full_request_u32,
250 if (subreq == NULL) {
251 kdc_tcp_terminate_connection(kdc_conn, "kdc_tcp_call_loop: "
252 "no memory for tstream_read_pdu_blob_send");
255 tevent_req_set_callback(subreq, kdc_tcp_call_loop, kdc_conn);
258 static void kdc_tcp_call_writev_done(struct tevent_req *subreq)
260 struct kdc_tcp_call *call = tevent_req_callback_data(subreq,
261 struct kdc_tcp_call);
265 rc = tstream_writev_queue_recv(subreq, &sys_errno);
270 reason = talloc_asprintf(call, "kdc_tcp_call_writev_done: "
271 "tstream_writev_queue_recv() - %d:%s",
272 sys_errno, strerror(sys_errno));
274 reason = "kdc_tcp_call_writev_done: tstream_writev_queue_recv() failed";
277 kdc_tcp_terminate_connection(call->kdc_conn, reason);
281 /* We don't care about errors */
287 called when we get a new connection
289 static void kdc_tcp_accept(struct stream_connection *conn)
291 struct kdc_socket *kdc_socket;
292 struct kdc_tcp_connection *kdc_conn;
293 struct tevent_req *subreq;
296 kdc_conn = talloc_zero(conn, struct kdc_tcp_connection);
297 if (kdc_conn == NULL) {
298 stream_terminate_connection(conn,
299 "kdc_tcp_accept: out of memory");
303 kdc_conn->send_queue = tevent_queue_create(conn, "kdc_tcp_accept");
304 if (kdc_conn->send_queue == NULL) {
305 stream_terminate_connection(conn,
306 "kdc_tcp_accept: out of memory");
310 kdc_socket = talloc_get_type(conn->private_data, struct kdc_socket);
312 TALLOC_FREE(conn->event.fde);
314 rc = tstream_bsd_existing_socket(kdc_conn,
315 socket_get_fd(conn->socket),
318 stream_terminate_connection(conn,
319 "kdc_tcp_accept: out of memory");
323 kdc_conn->conn = conn;
324 kdc_conn->kdc_socket = kdc_socket;
325 conn->private_data = kdc_conn;
328 * The krb5 tcp pdu's has the length as 4 byte (initial_read_size),
329 * packet_full_request_u32 provides the pdu length then.
331 subreq = tstream_read_pdu_blob_send(kdc_conn,
332 kdc_conn->conn->event.ctx,
334 4, /* initial_read_size */
335 packet_full_request_u32,
337 if (subreq == NULL) {
338 kdc_tcp_terminate_connection(kdc_conn, "kdc_tcp_accept: "
339 "no memory for tstream_read_pdu_blob_send");
342 tevent_req_set_callback(subreq, kdc_tcp_call_loop, kdc_conn);
345 static const struct stream_server_ops kdc_tcp_stream_ops = {
347 .accept_connection = kdc_tcp_accept,
348 .recv_handler = kdc_tcp_recv,
349 .send_handler = kdc_tcp_send
352 /* hold information about one kdc/kpasswd udp socket */
353 struct kdc_udp_socket {
354 struct kdc_socket *kdc_socket;
355 struct tdgram_context *dgram;
356 struct tevent_queue *send_queue;
359 struct kdc_udp_call {
360 struct tsocket_address *src;
365 static void kdc_udp_call_sendto_done(struct tevent_req *subreq);
367 static void kdc_udp_call_loop(struct tevent_req *subreq)
369 struct kdc_udp_socket *sock = tevent_req_callback_data(subreq,
370 struct kdc_udp_socket);
371 struct kdc_udp_call *call;
377 call = talloc(sock, struct kdc_udp_call);
383 len = tdgram_recvfrom_recv(subreq, &sys_errno,
384 call, &buf, &call->src);
392 call->in.length = len;
394 DEBUG(10,("Received krb5 UDP packet of length %lu from %s\n",
395 (long)call->in.length,
396 tsocket_address_string(call->src, call)));
399 ok = sock->kdc_socket->process(sock->kdc_socket->kdc,
404 sock->kdc_socket->local_address,
411 subreq = tdgram_sendto_queue_send(call,
412 sock->kdc_socket->kdc->task->event_ctx,
418 if (subreq == NULL) {
422 tevent_req_set_callback(subreq, kdc_udp_call_sendto_done, call);
425 subreq = tdgram_recvfrom_send(sock,
426 sock->kdc_socket->kdc->task->event_ctx,
428 if (subreq == NULL) {
429 task_server_terminate(sock->kdc_socket->kdc->task,
430 "no memory for tdgram_recvfrom_send",
434 tevent_req_set_callback(subreq, kdc_udp_call_loop, sock);
437 static void kdc_udp_call_sendto_done(struct tevent_req *subreq)
439 struct kdc_udp_call *call = tevent_req_callback_data(subreq,
440 struct kdc_udp_call);
444 ret = tdgram_sendto_queue_recv(subreq, &sys_errno);
446 /* We don't care about errors */
452 start listening on the given address
454 static NTSTATUS kdc_add_socket(struct kdc_server *kdc,
455 const struct model_ops *model_ops,
459 kdc_process_fn_t process)
461 struct kdc_socket *kdc_socket;
462 struct kdc_udp_socket *kdc_udp_socket;
463 struct tevent_req *udpsubreq;
467 kdc_socket = talloc(kdc, struct kdc_socket);
468 NT_STATUS_HAVE_NO_MEMORY(kdc_socket);
470 kdc_socket->kdc = kdc;
471 kdc_socket->process = process;
473 ret = tsocket_address_inet_from_strings(kdc_socket, "ip",
475 &kdc_socket->local_address);
477 status = map_nt_error_from_unix(errno);
481 status = stream_setup_socket(kdc->task->event_ctx,
485 "ip", address, &port,
486 lpcfg_socket_options(kdc->task->lp_ctx),
488 if (!NT_STATUS_IS_OK(status)) {
489 DEBUG(0,("Failed to bind to %s:%u TCP - %s\n",
490 address, port, nt_errstr(status)));
491 talloc_free(kdc_socket);
495 kdc_udp_socket = talloc(kdc_socket, struct kdc_udp_socket);
496 NT_STATUS_HAVE_NO_MEMORY(kdc_udp_socket);
498 kdc_udp_socket->kdc_socket = kdc_socket;
500 ret = tdgram_inet_udp_socket(kdc_socket->local_address,
503 &kdc_udp_socket->dgram);
505 status = map_nt_error_from_unix(errno);
506 DEBUG(0,("Failed to bind to %s:%u UDP - %s\n",
507 address, port, nt_errstr(status)));
511 kdc_udp_socket->send_queue = tevent_queue_create(kdc_udp_socket,
512 "kdc_udp_send_queue");
513 NT_STATUS_HAVE_NO_MEMORY(kdc_udp_socket->send_queue);
515 udpsubreq = tdgram_recvfrom_send(kdc_udp_socket,
516 kdc->task->event_ctx,
517 kdc_udp_socket->dgram);
518 NT_STATUS_HAVE_NO_MEMORY(udpsubreq);
519 tevent_req_set_callback(udpsubreq, kdc_udp_call_loop, kdc_udp_socket);
526 setup our listening sockets on the configured network interfaces
528 static NTSTATUS kdc_startup_interfaces(struct kdc_server *kdc, struct loadparm_context *lp_ctx,
529 struct interface *ifaces)
531 const struct model_ops *model_ops;
533 TALLOC_CTX *tmp_ctx = talloc_new(kdc);
537 /* within the kdc task we want to be a single process, so
538 ask for the single process model ops and pass these to the
539 stream_setup_socket() call. */
540 model_ops = process_model_startup(kdc->task->event_ctx, "single");
542 DEBUG(0,("Can't find 'single' process model_ops\n"));
543 return NT_STATUS_INTERNAL_ERROR;
546 num_interfaces = iface_count(ifaces);
548 for (i=0; i<num_interfaces; i++) {
549 const char *address = talloc_strdup(tmp_ctx, iface_n_ip(ifaces, i));
550 uint16_t kdc_port = lpcfg_krb5_port(lp_ctx);
551 uint16_t kpasswd_port = lpcfg_kpasswd_port(lp_ctx);
554 status = kdc_add_socket(kdc, model_ops,
555 "kdc", address, kdc_port,
557 NT_STATUS_NOT_OK_RETURN(status);
561 status = kdc_add_socket(kdc, model_ops,
562 "kpasswd", address, kpasswd_port,
564 NT_STATUS_NOT_OK_RETURN(status);
568 talloc_free(tmp_ctx);
574 static NTSTATUS kdc_check_generic_kerberos(struct irpc_message *msg,
575 struct kdc_check_generic_kerberos *r)
577 struct PAC_Validate pac_validate;
579 struct PAC_SIGNATURE_DATA kdc_sig;
580 struct kdc_server *kdc = talloc_get_type(msg->private_data, struct kdc_server);
581 enum ndr_err_code ndr_err;
585 krb5_principal principal;
586 krb5_keyblock keyblock;
589 /* There is no reply to this request */
590 r->out.generic_reply = data_blob(NULL, 0);
592 ndr_err = ndr_pull_struct_blob(&r->in.generic_request, msg, &pac_validate,
593 (ndr_pull_flags_fn_t)ndr_pull_PAC_Validate);
594 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
595 return NT_STATUS_INVALID_PARAMETER;
598 if (pac_validate.MessageType != 3) {
599 /* We don't implement any other message types - such as certificate validation - yet */
600 return NT_STATUS_INVALID_PARAMETER;
603 if (pac_validate.ChecksumAndSignature.length != (pac_validate.ChecksumLength + pac_validate.SignatureLength)
604 || pac_validate.ChecksumAndSignature.length < pac_validate.ChecksumLength
605 || pac_validate.ChecksumAndSignature.length < pac_validate.SignatureLength ) {
606 return NT_STATUS_INVALID_PARAMETER;
609 srv_sig = data_blob_const(pac_validate.ChecksumAndSignature.data,
610 pac_validate.ChecksumLength);
612 if (pac_validate.SignatureType == CKSUMTYPE_HMAC_MD5) {
613 etype = ETYPE_ARCFOUR_HMAC_MD5;
615 ret = krb5_cksumtype_to_enctype(kdc->smb_krb5_context->krb5_context, pac_validate.SignatureType,
618 return NT_STATUS_LOGON_FAILURE;
622 ret = krb5_make_principal(kdc->smb_krb5_context->krb5_context, &principal,
623 lpcfg_realm(kdc->task->lp_ctx),
624 "krbtgt", lpcfg_realm(kdc->task->lp_ctx),
628 return NT_STATUS_NO_MEMORY;
631 ret = kdc->config->db[0]->hdb_fetch(kdc->smb_krb5_context->krb5_context,
634 HDB_F_GET_KRBTGT | HDB_F_DECRYPT,
638 hdb_free_entry(kdc->smb_krb5_context->krb5_context, &ent);
639 krb5_free_principal(kdc->smb_krb5_context->krb5_context, principal);
641 return NT_STATUS_LOGON_FAILURE;
644 ret = hdb_enctype2key(kdc->smb_krb5_context->krb5_context, &ent.entry, etype, &key);
647 hdb_free_entry(kdc->smb_krb5_context->krb5_context, &ent);
648 krb5_free_principal(kdc->smb_krb5_context->krb5_context, principal);
649 return NT_STATUS_LOGON_FAILURE;
654 kdc_sig.type = pac_validate.SignatureType;
655 kdc_sig.signature = data_blob_const(&pac_validate.ChecksumAndSignature.data[pac_validate.ChecksumLength],
656 pac_validate.SignatureLength);
657 ret = check_pac_checksum(msg, srv_sig, &kdc_sig,
658 kdc->smb_krb5_context->krb5_context, &keyblock);
660 hdb_free_entry(kdc->smb_krb5_context->krb5_context, &ent);
661 krb5_free_principal(kdc->smb_krb5_context->krb5_context, principal);
664 return NT_STATUS_LOGON_FAILURE;
674 static void kdc_task_init(struct task_server *task)
676 struct kdc_server *kdc;
679 struct interface *ifaces;
681 switch (lpcfg_server_role(task->lp_ctx)) {
682 case ROLE_STANDALONE:
683 task_server_terminate(task, "kdc: no KDC required in standalone configuration", false);
685 case ROLE_DOMAIN_MEMBER:
686 task_server_terminate(task, "kdc: no KDC required in member server configuration", false);
688 case ROLE_DOMAIN_CONTROLLER:
689 /* Yes, we want a KDC */
693 load_interfaces(task, lpcfg_interfaces(task->lp_ctx), &ifaces);
695 if (iface_count(ifaces) == 0) {
696 task_server_terminate(task, "kdc: no network interfaces configured", false);
700 task_server_set_title(task, "task[kdc]");
702 kdc = talloc(task, struct kdc_server);
704 task_server_terminate(task, "kdc: out of memory", true);
710 initialize_krb5_error_table();
712 ret = smb_krb5_init_context(kdc, task->event_ctx, task->lp_ctx, &kdc->smb_krb5_context);
714 DEBUG(1,("kdc_task_init: krb5_init_context failed (%s)\n",
715 error_message(ret)));
716 task_server_terminate(task, "kdc: krb5_init_context failed", true);
720 krb5_add_et_list(kdc->smb_krb5_context->krb5_context, initialize_hdb_error_table_r);
722 ret = krb5_kdc_get_config(kdc->smb_krb5_context->krb5_context,
725 task_server_terminate(task, "kdc: failed to get KDC configuration", true);
729 kdc->config->logf = kdc->smb_krb5_context->logf;
730 kdc->config->db = talloc(kdc, struct HDB *);
731 if (!kdc->config->db) {
732 task_server_terminate(task, "kdc: out of memory", true);
735 kdc->config->num_db = 1;
737 /* Register hdb-samba4 hooks for use as a keytab */
739 kdc->base_ctx = talloc_zero(kdc, struct samba_kdc_base_context);
740 if (!kdc->base_ctx) {
741 task_server_terminate(task, "kdc: out of memory", true);
745 kdc->base_ctx->ev_ctx = task->event_ctx;
746 kdc->base_ctx->lp_ctx = task->lp_ctx;
748 status = hdb_samba4_create_kdc(kdc->base_ctx,
749 kdc->smb_krb5_context->krb5_context,
750 &kdc->config->db[0]);
751 if (!NT_STATUS_IS_OK(status)) {
752 task_server_terminate(task, "kdc: hdb_samba4_create_kdc (setup KDC database) failed", true);
756 ret = krb5_plugin_register(kdc->smb_krb5_context->krb5_context,
757 PLUGIN_TYPE_DATA, "hdb",
760 task_server_terminate(task, "kdc: failed to register hdb plugin", true);
764 ret = krb5_kt_register(kdc->smb_krb5_context->krb5_context, &hdb_kt_ops);
766 task_server_terminate(task, "kdc: failed to register keytab plugin", true);
770 /* Register WinDC hooks */
771 ret = krb5_plugin_register(kdc->smb_krb5_context->krb5_context,
772 PLUGIN_TYPE_DATA, "windc",
773 &windc_plugin_table);
775 task_server_terminate(task, "kdc: failed to register windc plugin", true);
779 krb5_kdc_windc_init(kdc->smb_krb5_context->krb5_context);
781 /* start listening on the configured network interfaces */
782 status = kdc_startup_interfaces(kdc, task->lp_ctx, ifaces);
783 if (!NT_STATUS_IS_OK(status)) {
784 task_server_terminate(task, "kdc failed to setup interfaces", true);
788 status = IRPC_REGISTER(task->msg_ctx, irpc, KDC_CHECK_GENERIC_KERBEROS,
789 kdc_check_generic_kerberos, kdc);
790 if (!NT_STATUS_IS_OK(status)) {
791 task_server_terminate(task, "nbtd failed to setup monitoring", true);
795 irpc_add_name(task->msg_ctx, "kdc_server");
799 /* called at smbd startup - register ourselves as a server service */
800 NTSTATUS server_service_kdc_init(void)
802 return register_server_service("kdc", kdc_task_init);