tsocket: Fixed tsocket_guide.txt asciidoc syntax.
[ira/wip.git] / source4 / kdc / kdc.c
1 /* 
2    Unix SMB/CIFS implementation.
3
4    KDC Server startup
5
6    Copyright (C) Andrew Bartlett <abartlet@samba.org> 2005-2008
7    Copyright (C) Andrew Tridgell        2005
8    Copyright (C) Stefan Metzmacher      2005
9
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.
14    
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.
19    
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/>.
22 */
23
24 #include "includes.h"
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"
40 #include "kdc/kdc.h"
41 #include "librpc/gen_ndr/ndr_misc.h"
42
43
44 /* Disgusting hack to get a mem_ctx and lp_ctx into the hdb plugin, when 
45  * used as a keytab */
46 TALLOC_CTX *hdb_samba4_mem_ctx;
47 struct tevent_context *hdb_samba4_ev_ctx;
48 struct loadparm_context *hdb_samba4_lp_ctx;
49
50 /* hold all the info needed to send a reply */
51 struct kdc_reply {
52         struct kdc_reply *next, *prev;
53         struct socket_address *dest;
54         DATA_BLOB packet;
55 };
56
57 typedef bool (*kdc_process_fn_t)(struct kdc_server *kdc,
58                                  TALLOC_CTX *mem_ctx, 
59                                  DATA_BLOB *input, 
60                                  DATA_BLOB *reply,
61                                  struct socket_address *peer_addr, 
62                                  struct socket_address *my_addr, 
63                                  int datagram);
64
65 /* hold information about one kdc socket */
66 struct kdc_socket {
67         struct socket_context *sock;
68         struct kdc_server *kdc;
69         struct tevent_fd *fde;
70
71         /* a queue of outgoing replies that have been deferred */
72         struct kdc_reply *send_queue;
73
74         kdc_process_fn_t process;
75 };
76 /*
77   state of an open tcp connection
78 */
79 struct kdc_tcp_connection {
80         /* stream connection we belong to */
81         struct stream_connection *conn;
82
83         /* the kdc_server the connection belongs to */
84         struct kdc_server *kdc;
85
86         struct packet_context *packet;
87
88         kdc_process_fn_t process;
89 };
90
91 /*
92   handle fd send events on a KDC socket
93 */
94 static void kdc_send_handler(struct kdc_socket *kdc_socket)
95 {
96         while (kdc_socket->send_queue) {
97                 struct kdc_reply *rep = kdc_socket->send_queue;
98                 NTSTATUS status;
99                 size_t sendlen;
100
101                 status = socket_sendto(kdc_socket->sock, &rep->packet, &sendlen,
102                                        rep->dest);
103                 if (NT_STATUS_EQUAL(status, STATUS_MORE_ENTRIES)) {
104                         break;
105                 }
106                 if (NT_STATUS_EQUAL(status, NT_STATUS_INVALID_BUFFER_SIZE)) {
107                         /* Replace with a krb err, response to big */
108                 }
109                 
110                 DLIST_REMOVE(kdc_socket->send_queue, rep);
111                 talloc_free(rep);
112         }
113
114         if (kdc_socket->send_queue == NULL) {
115                 EVENT_FD_NOT_WRITEABLE(kdc_socket->fde);
116         }
117 }
118
119
120 /*
121   handle fd recv events on a KDC socket
122 */
123 static void kdc_recv_handler(struct kdc_socket *kdc_socket)
124 {
125         NTSTATUS status;
126         TALLOC_CTX *tmp_ctx = talloc_new(kdc_socket);
127         DATA_BLOB blob;
128         struct kdc_reply *rep;
129         DATA_BLOB reply;
130         size_t nread, dsize;
131         struct socket_address *src;
132         struct socket_address *my_addr;
133         int ret;
134
135         status = socket_pending(kdc_socket->sock, &dsize);
136         if (!NT_STATUS_IS_OK(status)) {
137                 talloc_free(tmp_ctx);
138                 return;
139         }
140
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);
145                 return;
146         }
147
148         status = socket_recvfrom(kdc_socket->sock, blob.data, blob.length, &nread,
149                                  tmp_ctx, &src);
150         if (!NT_STATUS_IS_OK(status)) {
151                 talloc_free(tmp_ctx);
152                 return;
153         }
154         blob.length = nread;
155         
156         DEBUG(10,("Received krb5 UDP packet of length %lu from %s:%u\n", 
157                  (long)blob.length, src->addr, (uint16_t)src->port));
158         
159         my_addr = socket_get_my_addr(kdc_socket->sock, tmp_ctx);
160         if (!my_addr) {
161                 talloc_free(tmp_ctx);
162                 return;
163         }
164
165
166         /* Call krb5 */
167         ret = kdc_socket->process(kdc_socket->kdc, 
168                                   tmp_ctx, 
169                                   &blob,  
170                                   &reply,
171                                   src, my_addr,
172                                   1 /* Datagram */);
173         if (!ret) {
174                 talloc_free(tmp_ctx);
175                 return;
176         }
177
178         /* queue a pending reply */
179         rep = talloc(kdc_socket, struct kdc_reply);
180         if (rep == NULL) {
181                 talloc_free(tmp_ctx);
182                 return;
183         }
184         rep->dest         = talloc_steal(rep, src);
185         rep->packet       = reply;
186         talloc_steal(rep, reply.data);
187
188         if (rep->packet.data == NULL) {
189                 talloc_free(rep);
190                 talloc_free(tmp_ctx);
191                 return;
192         }
193
194         DLIST_ADD_END(kdc_socket->send_queue, rep, struct kdc_reply *);
195         EVENT_FD_WRITEABLE(kdc_socket->fde);
196         talloc_free(tmp_ctx);
197 }
198
199 /*
200   handle fd events on a KDC socket
201 */
202 static void kdc_socket_handler(struct tevent_context *ev, struct tevent_fd *fde,
203                                uint16_t flags, void *private_data)
204 {
205         struct kdc_socket *kdc_socket = talloc_get_type(private_data, struct kdc_socket);
206         if (flags & EVENT_FD_WRITE) {
207                 kdc_send_handler(kdc_socket);
208         } 
209         if (flags & EVENT_FD_READ) {
210                 kdc_recv_handler(kdc_socket);
211         }
212 }
213
214 static void kdc_tcp_terminate_connection(struct kdc_tcp_connection *kdcconn, const char *reason)
215 {
216         stream_terminate_connection(kdcconn->conn, reason);
217 }
218
219 /*
220   receive a full packet on a KDC connection
221 */
222 static NTSTATUS kdc_tcp_recv(void *private_data, DATA_BLOB blob)
223 {
224         struct kdc_tcp_connection *kdcconn = talloc_get_type(private_data,
225                                                              struct kdc_tcp_connection);
226         NTSTATUS status = NT_STATUS_UNSUCCESSFUL;
227         TALLOC_CTX *tmp_ctx = talloc_new(kdcconn);
228         int ret;
229         DATA_BLOB input, reply;
230         struct socket_address *src_addr;
231         struct socket_address *my_addr;
232
233         talloc_steal(tmp_ctx, blob.data);
234
235         src_addr = socket_get_peer_addr(kdcconn->conn->socket, tmp_ctx);
236         if (!src_addr) {
237                 talloc_free(tmp_ctx);
238                 return NT_STATUS_NO_MEMORY;
239         }
240
241         my_addr = socket_get_my_addr(kdcconn->conn->socket, tmp_ctx);
242         if (!my_addr) {
243                 talloc_free(tmp_ctx);
244                 return NT_STATUS_NO_MEMORY;
245         }
246
247         /* Call krb5 */
248         input = data_blob_const(blob.data + 4, blob.length - 4); 
249
250         ret = kdcconn->process(kdcconn->kdc, 
251                                tmp_ctx,
252                                &input,
253                                &reply,
254                                src_addr,
255                                my_addr,
256                                0 /* Not datagram */);
257         if (!ret) {
258                 talloc_free(tmp_ctx);
259                 return NT_STATUS_INTERNAL_ERROR;
260         }
261
262         /* and now encode the reply */
263         blob = data_blob_talloc(kdcconn, NULL, reply.length + 4);
264         if (!blob.data) {
265                 talloc_free(tmp_ctx);
266                 return NT_STATUS_NO_MEMORY;
267         }
268
269         RSIVAL(blob.data, 0, reply.length);
270         memcpy(blob.data + 4, reply.data, reply.length);        
271
272         status = packet_send(kdcconn->packet, blob);
273         if (!NT_STATUS_IS_OK(status)) {
274                 talloc_free(tmp_ctx);
275                 return status;
276         }
277
278         /* the call isn't needed any more */
279         talloc_free(tmp_ctx);
280         return NT_STATUS_OK;
281 }
282
283 /*
284   receive some data on a KDC connection
285 */
286 static void kdc_tcp_recv_handler(struct stream_connection *conn, uint16_t flags)
287 {
288         struct kdc_tcp_connection *kdcconn = talloc_get_type(conn->private_data,
289                                                              struct kdc_tcp_connection);
290         packet_recv(kdcconn->packet);
291 }
292
293 /*
294   called on a tcp recv error
295 */
296 static void kdc_tcp_recv_error(void *private_data, NTSTATUS status)
297 {
298         struct kdc_tcp_connection *kdcconn = talloc_get_type(private_data,
299                                              struct kdc_tcp_connection);
300         kdc_tcp_terminate_connection(kdcconn, nt_errstr(status));
301 }
302
303 /*
304   called when we can write to a connection
305 */
306 static void kdc_tcp_send(struct stream_connection *conn, uint16_t flags)
307 {
308         struct kdc_tcp_connection *kdcconn = talloc_get_type(conn->private_data,
309                                                              struct kdc_tcp_connection);
310         packet_queue_run(kdcconn->packet);
311 }
312
313 /**
314    Wrapper for krb5_kdc_process_krb5_request, converting to/from Samba
315    calling conventions
316 */
317
318 static bool kdc_process(struct kdc_server *kdc,
319                         TALLOC_CTX *mem_ctx, 
320                         DATA_BLOB *input, 
321                         DATA_BLOB *reply,
322                         struct socket_address *peer_addr, 
323                         struct socket_address *my_addr,
324                         int datagram_reply)
325 {
326         int ret;        
327         krb5_data k5_reply;
328         krb5_data_zero(&k5_reply);
329
330         krb5_kdc_update_time(NULL);
331
332         DEBUG(10,("Received KDC packet of length %lu from %s:%d\n", 
333                   (long)input->length - 4, peer_addr->addr, peer_addr->port));
334
335         ret = krb5_kdc_process_krb5_request(kdc->smb_krb5_context->krb5_context, 
336                                             kdc->config,
337                                             input->data, input->length,
338                                             &k5_reply,
339                                             peer_addr->addr,
340                                             peer_addr->sockaddr,
341                                             datagram_reply);
342         if (ret == -1) {
343                 *reply = data_blob(NULL, 0);
344                 return false;
345         }
346         if (k5_reply.length) {
347                 *reply = data_blob_talloc(mem_ctx, k5_reply.data, k5_reply.length);
348                 krb5_data_free(&k5_reply);
349         } else {
350                 *reply = data_blob(NULL, 0);    
351         }
352         return true;
353 }
354
355 /*
356   called when we get a new connection
357 */
358 static void kdc_tcp_accept(struct stream_connection *conn)
359 {
360         struct kdc_socket *kdc_socket = talloc_get_type(conn->private_data, struct kdc_socket);
361         struct kdc_tcp_connection *kdcconn;
362
363         kdcconn = talloc_zero(conn, struct kdc_tcp_connection);
364         if (!kdcconn) {
365                 stream_terminate_connection(conn, "kdc_tcp_accept: out of memory");
366                 return;
367         }
368         kdcconn->conn    = conn;
369         kdcconn->kdc     = kdc_socket->kdc;
370         kdcconn->process = kdc_socket->process;
371         conn->private_data    = kdcconn;
372
373         kdcconn->packet = packet_init(kdcconn);
374         if (kdcconn->packet == NULL) {
375                 kdc_tcp_terminate_connection(kdcconn, "kdc_tcp_accept: out of memory");
376                 return;
377         }
378         packet_set_private(kdcconn->packet, kdcconn);
379         packet_set_socket(kdcconn->packet, conn->socket);
380         packet_set_callback(kdcconn->packet, kdc_tcp_recv);
381         packet_set_full_request(kdcconn->packet, packet_full_request_u32);
382         packet_set_error_handler(kdcconn->packet, kdc_tcp_recv_error);
383         packet_set_event_context(kdcconn->packet, conn->event.ctx);
384         packet_set_fde(kdcconn->packet, conn->event.fde);
385         packet_set_serialise(kdcconn->packet);
386 }
387
388 static const struct stream_server_ops kdc_tcp_stream_ops = {
389         .name                   = "kdc_tcp",
390         .accept_connection      = kdc_tcp_accept,
391         .recv_handler           = kdc_tcp_recv_handler,
392         .send_handler           = kdc_tcp_send
393 };
394
395 /*
396   start listening on the given address
397 */
398 static NTSTATUS kdc_add_socket(struct kdc_server *kdc,
399                                const struct model_ops *model_ops,
400                                const char *name,
401                                const char *address,
402                                uint16_t port,
403                                kdc_process_fn_t process)
404 {
405         struct kdc_socket *kdc_socket;
406         struct socket_address *socket_address;
407         NTSTATUS status;
408
409         kdc_socket = talloc(kdc, struct kdc_socket);
410         NT_STATUS_HAVE_NO_MEMORY(kdc_socket);
411
412         status = socket_create("ip", SOCKET_TYPE_DGRAM, &kdc_socket->sock, 0);
413         if (!NT_STATUS_IS_OK(status)) {
414                 talloc_free(kdc_socket);
415                 return status;
416         }
417
418         kdc_socket->kdc = kdc;
419         kdc_socket->send_queue = NULL;
420         kdc_socket->process = process;
421
422         talloc_steal(kdc_socket, kdc_socket->sock);
423
424         kdc_socket->fde = event_add_fd(kdc->task->event_ctx, kdc, 
425                                            socket_get_fd(kdc_socket->sock), EVENT_FD_READ,
426                                            kdc_socket_handler, kdc_socket);
427         
428         socket_address = socket_address_from_strings(kdc_socket, kdc_socket->sock->backend_name, 
429                                                       address, port);
430         NT_STATUS_HAVE_NO_MEMORY_AND_FREE(socket_address, kdc_socket);
431
432         status = socket_listen(kdc_socket->sock, socket_address, 0, 0);
433         if (!NT_STATUS_IS_OK(status)) {
434                 DEBUG(0,("Failed to bind to %s:%d UDP for %s - %s\n", 
435                          address, port, name, nt_errstr(status)));
436                 talloc_free(kdc_socket);
437                 return status;
438         }
439
440         status = stream_setup_socket(kdc->task->event_ctx, 
441                                      kdc->task->lp_ctx,
442                                      model_ops, 
443                                      &kdc_tcp_stream_ops, 
444                                      "ip", address, &port, 
445                                      lp_socket_options(kdc->task->lp_ctx), 
446                                      kdc_socket);
447         if (!NT_STATUS_IS_OK(status)) {
448                 DEBUG(0,("Failed to bind to %s:%u TCP - %s\n",
449                          address, port, nt_errstr(status)));
450                 talloc_free(kdc_socket);
451                 return status;
452         }
453
454         return NT_STATUS_OK;
455 }
456
457
458 /*
459   setup our listening sockets on the configured network interfaces
460 */
461 static NTSTATUS kdc_startup_interfaces(struct kdc_server *kdc, struct loadparm_context *lp_ctx,
462                                        struct interface *ifaces)
463 {
464         const struct model_ops *model_ops;
465         int num_interfaces;
466         TALLOC_CTX *tmp_ctx = talloc_new(kdc);
467         NTSTATUS status;
468         int i;
469
470         /* within the kdc task we want to be a single process, so
471            ask for the single process model ops and pass these to the
472            stream_setup_socket() call. */
473         model_ops = process_model_startup(kdc->task->event_ctx, "single");
474         if (!model_ops) {
475                 DEBUG(0,("Can't find 'single' process model_ops\n"));
476                 return NT_STATUS_INTERNAL_ERROR;
477         }
478
479         num_interfaces = iface_count(ifaces);
480         
481         for (i=0; i<num_interfaces; i++) {
482                 const char *address = talloc_strdup(tmp_ctx, iface_n_ip(ifaces, i));
483                 uint16_t kdc_port = lp_krb5_port(lp_ctx);
484                 uint16_t kpasswd_port = lp_kpasswd_port(lp_ctx);
485
486                 if (kdc_port) {
487                         status = kdc_add_socket(kdc, model_ops,
488                                         "kdc", address, kdc_port,
489                                         kdc_process);
490                         NT_STATUS_NOT_OK_RETURN(status);
491                 }
492
493                 if (kpasswd_port) {
494                         status = kdc_add_socket(kdc, model_ops,
495                                         "kpasswd", address, kpasswd_port,
496                                         kpasswdd_process);
497                         NT_STATUS_NOT_OK_RETURN(status);
498                 }
499         }
500
501         talloc_free(tmp_ctx);
502
503         return NT_STATUS_OK;
504 }
505
506
507 static NTSTATUS kdc_check_generic_kerberos(struct irpc_message *msg, 
508                                  struct kdc_check_generic_kerberos *r)
509 {
510         struct PAC_Validate pac_validate;
511         DATA_BLOB srv_sig;
512         struct PAC_SIGNATURE_DATA kdc_sig;
513         struct kdc_server *kdc = talloc_get_type(msg->private_data, struct kdc_server);
514         enum ndr_err_code ndr_err;
515         krb5_enctype etype;
516         int ret;
517         hdb_entry_ex ent;
518         krb5_principal principal;
519         krb5_keyblock keyblock;
520         Key *key;
521
522         /* There is no reply to this request */
523         r->out.generic_reply = data_blob(NULL, 0);
524
525         ndr_err = ndr_pull_struct_blob(&r->in.generic_request, msg, 
526                                        lp_iconv_convenience(kdc->task->lp_ctx), 
527                                        &pac_validate,
528                                        (ndr_pull_flags_fn_t)ndr_pull_PAC_Validate);
529         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
530                 return NT_STATUS_INVALID_PARAMETER;
531         }
532         
533         if (pac_validate.MessageType != 3) {
534                 /* We don't implement any other message types - such as certificate validation - yet */
535                 return NT_STATUS_INVALID_PARAMETER;
536         }
537
538         if (pac_validate.ChecksumAndSignature.length != (pac_validate.ChecksumLength + pac_validate.SignatureLength)
539             || pac_validate.ChecksumAndSignature.length < pac_validate.ChecksumLength
540             || pac_validate.ChecksumAndSignature.length < pac_validate.SignatureLength ) {
541                 return NT_STATUS_INVALID_PARAMETER;
542         }
543         
544         srv_sig = data_blob_const(pac_validate.ChecksumAndSignature.data, 
545                                   pac_validate.ChecksumLength);
546         
547         if (pac_validate.SignatureType == CKSUMTYPE_HMAC_MD5) {
548                 etype = ETYPE_ARCFOUR_HMAC_MD5;
549         } else {
550                 ret = krb5_cksumtype_to_enctype(kdc->smb_krb5_context->krb5_context, pac_validate.SignatureType,
551                                                 &etype);
552                 if (ret != 0) {
553                         return NT_STATUS_LOGON_FAILURE;
554                 }
555         }
556
557         ret = krb5_make_principal(kdc->smb_krb5_context->krb5_context, &principal, 
558                                   lp_realm(kdc->task->lp_ctx),
559                                   "krbtgt", lp_realm(kdc->task->lp_ctx), 
560                                   NULL);
561
562         if (ret != 0) {
563                 return NT_STATUS_NO_MEMORY;
564         }
565
566         ret = kdc->config->db[0]->hdb_fetch(kdc->smb_krb5_context->krb5_context, 
567                                             kdc->config->db[0],
568                                             principal,
569                                             HDB_F_GET_KRBTGT | HDB_F_DECRYPT,
570                                             &ent);
571
572         if (ret != 0) {
573                 hdb_free_entry(kdc->smb_krb5_context->krb5_context, &ent);
574                 krb5_free_principal(kdc->smb_krb5_context->krb5_context, principal);
575         
576                 return NT_STATUS_LOGON_FAILURE;
577         }
578         
579         ret = hdb_enctype2key(kdc->smb_krb5_context->krb5_context, &ent.entry, etype, &key);
580
581         if (ret != 0) {
582                 hdb_free_entry(kdc->smb_krb5_context->krb5_context, &ent);
583                 krb5_free_principal(kdc->smb_krb5_context->krb5_context, principal);
584                 return NT_STATUS_LOGON_FAILURE;
585         }
586
587         keyblock = key->key;
588         
589         kdc_sig.type = pac_validate.SignatureType;
590         kdc_sig.signature = data_blob_const(&pac_validate.ChecksumAndSignature.data[pac_validate.ChecksumLength],
591                                             pac_validate.SignatureLength);
592         ret = check_pac_checksum(msg, srv_sig, &kdc_sig, 
593                            kdc->smb_krb5_context->krb5_context, &keyblock);
594
595         hdb_free_entry(kdc->smb_krb5_context->krb5_context, &ent);
596         krb5_free_principal(kdc->smb_krb5_context->krb5_context, principal);
597
598         if (ret != 0) {
599                 return NT_STATUS_LOGON_FAILURE;
600         }
601         
602         return NT_STATUS_OK;
603 }
604
605
606 /*
607   startup the kdc task
608 */
609 static void kdc_task_init(struct task_server *task)
610 {
611         struct kdc_server *kdc;
612         NTSTATUS status;
613         krb5_error_code ret;
614         struct interface *ifaces;
615
616         switch (lp_server_role(task->lp_ctx)) {
617         case ROLE_STANDALONE:
618                 task_server_terminate(task, "kdc: no KDC required in standalone configuration", false);
619                 return;
620         case ROLE_DOMAIN_MEMBER:
621                 task_server_terminate(task, "kdc: no KDC required in member server configuration", false);
622                 return;
623         case ROLE_DOMAIN_CONTROLLER:
624                 /* Yes, we want a KDC */
625                 break;
626         }
627
628         load_interfaces(task, lp_interfaces(task->lp_ctx), &ifaces);
629
630         if (iface_count(ifaces) == 0) {
631                 task_server_terminate(task, "kdc: no network interfaces configured", false);
632                 return;
633         }
634
635         task_server_set_title(task, "task[kdc]");
636
637         kdc = talloc(task, struct kdc_server);
638         if (kdc == NULL) {
639                 task_server_terminate(task, "kdc: out of memory", true);
640                 return;
641         }
642
643         kdc->task = task;
644
645         initialize_krb5_error_table();
646
647         ret = smb_krb5_init_context(kdc, task->event_ctx, task->lp_ctx, &kdc->smb_krb5_context);
648         if (ret) {
649                 DEBUG(1,("kdc_task_init: krb5_init_context failed (%s)\n", 
650                          error_message(ret)));
651                 task_server_terminate(task, "kdc: krb5_init_context failed", true);
652                 return; 
653         }
654
655         krb5_add_et_list(kdc->smb_krb5_context->krb5_context, initialize_hdb_error_table_r);
656
657         ret = krb5_kdc_get_config(kdc->smb_krb5_context->krb5_context, 
658                                   &kdc->config);
659         if(ret) {
660                 task_server_terminate(task, "kdc: failed to get KDC configuration", true);
661                 return;
662         }
663  
664         kdc->config->logf = kdc->smb_krb5_context->logf;
665         kdc->config->db = talloc(kdc, struct HDB *);
666         if (!kdc->config->db) {
667                 task_server_terminate(task, "kdc: out of memory", true);
668                 return;
669         }
670         kdc->config->num_db = 1;
671                 
672         status = hdb_samba4_create_kdc(kdc, task->event_ctx, task->lp_ctx, 
673                                        kdc->smb_krb5_context->krb5_context, 
674                                        &kdc->config->db[0]);
675         if (!NT_STATUS_IS_OK(status)) {
676                 task_server_terminate(task, "kdc: hdb_samba4_create_kdc (setup KDC database) failed", true);
677                 return; 
678         }
679
680         /* Register hdb-samba4 hooks for use as a keytab */
681
682         kdc->hdb_samba4_context = talloc(kdc, struct hdb_samba4_context);
683         if (!kdc->hdb_samba4_context) {
684                 task_server_terminate(task, "kdc: out of memory", true);
685                 return; 
686         }
687
688         kdc->hdb_samba4_context->ev_ctx = task->event_ctx;
689         kdc->hdb_samba4_context->lp_ctx = task->lp_ctx;
690
691         ret = krb5_plugin_register(kdc->smb_krb5_context->krb5_context, 
692                                    PLUGIN_TYPE_DATA, "hdb",
693                                    &hdb_samba4);
694         if(ret) {
695                 task_server_terminate(task, "kdc: failed to register hdb keytab", true);
696                 return;
697         }
698
699         ret = krb5_kt_register(kdc->smb_krb5_context->krb5_context, &hdb_kt_ops);
700         if(ret) {
701                 task_server_terminate(task, "kdc: failed to register hdb keytab", true);
702                 return;
703         }
704
705         /* Registar WinDC hooks */
706         ret = krb5_plugin_register(kdc->smb_krb5_context->krb5_context, 
707                                    PLUGIN_TYPE_DATA, "windc",
708                                    &windc_plugin_table);
709         if(ret) {
710                 task_server_terminate(task, "kdc: failed to register hdb keytab", true);
711                 return;
712         }
713
714         krb5_kdc_windc_init(kdc->smb_krb5_context->krb5_context);
715
716         /* start listening on the configured network interfaces */
717         status = kdc_startup_interfaces(kdc, task->lp_ctx, ifaces);
718         if (!NT_STATUS_IS_OK(status)) {
719                 task_server_terminate(task, "kdc failed to setup interfaces", true);
720                 return;
721         }
722
723         status = IRPC_REGISTER(task->msg_ctx, irpc, KDC_CHECK_GENERIC_KERBEROS, 
724                                kdc_check_generic_kerberos, kdc);
725         if (!NT_STATUS_IS_OK(status)) {
726                 task_server_terminate(task, "nbtd failed to setup monitoring", true);
727                 return;
728         }
729
730         irpc_add_name(task->msg_ctx, "kdc_server");
731 }
732
733
734 /* called at smbd startup - register ourselves as a server service */
735 NTSTATUS server_service_kdc_init(void)
736 {
737         return register_server_service("kdc", kdc_task_init);
738 }