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
   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 "kdc/kdc.h"
  32 #include "system/network.h"
  33 #include "lib/util/dlinklist.h"
  34 #include "lib/messaging/irpc.h"
  35 #include "lib/stream/packet.h"
  36 #include "librpc/gen_ndr/samr.h"
  37 #include "lib/socket/netif.h"
  38 #include "heimdal/kdc/windc_plugin.h"
  39 #include "heimdal/lib/krb5/krb5_locl.h"
  40 #include "heimdal/kdc/kdc_locl.h"
  41 #include "param/param.h"
  42
  43
  44 /* Disgusting hack to get a mem_ctx into the hdb plugin, when used as a keytab */
  45 TALLOC_CTX *kdc_mem_ctx;
  46
  47 /* hold all the info needed to send a reply */
  48 struct kdc_reply {
  49         struct kdc_reply *next, *prev;
  50         struct socket_address *dest;
  51         DATA_BLOB packet;
  52 };
  53
  54 typedef bool (*kdc_process_fn_t)(struct kdc_server *kdc,
  55                                  TALLOC_CTX *mem_ctx,
  56                                  DATA_BLOB *input,
  57                                  DATA_BLOB *reply,
  58                                  struct socket_address *peer_addr,
  59                                  struct socket_address *my_addr,
  60                                  int datagram);
  61
  62 /* hold information about one kdc socket */
  63 struct kdc_socket {
  64         struct socket_context *sock;
  65         struct kdc_server *kdc;
  66         struct fd_event *fde;
  67
  68         /* a queue of outgoing replies that have been deferred */
  69         struct kdc_reply *send_queue;
  70
  71         kdc_process_fn_t process;
  72 };
  73 /*
  74   state of an open tcp connection
  75 */
  76 struct kdc_tcp_connection {
  77         /* stream connection we belong to */
  78         struct stream_connection *conn;
  79
  80         /* the kdc_server the connection belongs to */
  81         struct kdc_server *kdc;
  82
  83         struct packet_context *packet;
  84
  85         kdc_process_fn_t process;
  86 };
  87
  88 /*
  89   handle fd send events on a KDC socket
  90 */
  91 static void kdc_send_handler(struct kdc_socket *kdc_socket)
  92 {
  93         while (kdc_socket->send_queue) {
  94                 struct kdc_reply *rep = kdc_socket->send_queue;
  95                 NTSTATUS status;
  96                 size_t sendlen;
  97
  98                 status = socket_sendto(kdc_socket->sock, &rep->packet, &sendlen,
  99                                        rep->dest);
 100                 if (NT_STATUS_EQUAL(status, STATUS_MORE_ENTRIES)) {
 101                         break;
 102                 }
 103                 if (NT_STATUS_EQUAL(status, NT_STATUS_INVALID_BUFFER_SIZE)) {
 104                         /* Replace with a krb err, response to big */
 105                 }
 106
 107                 DLIST_REMOVE(kdc_socket->send_queue, rep);
 108                 talloc_free(rep);
 109         }
 110
 111         if (kdc_socket->send_queue == NULL) {
 112                 EVENT_FD_NOT_WRITEABLE(kdc_socket->fde);
 113         }
 114 }
 115
 116
 117 /*
 118   handle fd recv events on a KDC socket
 119 */
 120 static void kdc_recv_handler(struct kdc_socket *kdc_socket)
 121 {
 122         NTSTATUS status;
 123         TALLOC_CTX *tmp_ctx = talloc_new(kdc_socket);
 124         DATA_BLOB blob;
 125         struct kdc_reply *rep;
 126         DATA_BLOB reply;
 127         size_t nread, dsize;
 128         struct socket_address *src;
 129         struct socket_address *my_addr;
 130         int ret;
 131
 132         status = socket_pending(kdc_socket->sock, &dsize);
 133         if (!NT_STATUS_IS_OK(status)) {
 134                 talloc_free(tmp_ctx);
 135                 return;
 136         }
 137
 138         blob = data_blob_talloc(tmp_ctx, NULL, dsize);
 139         if (blob.data == NULL) {
 140                 /* hope this is a temporary low memory condition */
 141                 talloc_free(tmp_ctx);
 142                 return;
 143         }
 144
 145         status = socket_recvfrom(kdc_socket->sock, blob.data, blob.length, &nread,
 146                                  tmp_ctx, &src);
 147         if (!NT_STATUS_IS_OK(status)) {
 148                 talloc_free(tmp_ctx);
 149                 return;
 150         }
 151         blob.length = nread;
 152
 153         DEBUG(10,("Received krb5 UDP packet of length %lu from %s:%u\n",
 154                  (long)blob.length, src->addr, (uint16_t)src->port));
 155
 156         my_addr = socket_get_my_addr(kdc_socket->sock, tmp_ctx);
 157         if (!my_addr) {
 158                 talloc_free(tmp_ctx);
 159                 return;
 160         }
 161
 162
 163         /* Call krb5 */
 164         ret = kdc_socket->process(kdc_socket->kdc,
 165                                   tmp_ctx,
 166                                   &blob,
 167                                   &reply,
 168                                   src, my_addr,
 169                                   1 /* Datagram */);
 170         if (!ret) {
 171                 talloc_free(tmp_ctx);
 172                 return;
 173         }
 174
 175         /* queue a pending reply */
 176         rep = talloc(kdc_socket, struct kdc_reply);
 177         if (rep == NULL) {
 178                 talloc_free(tmp_ctx);
 179                 return;
 180         }
 181         rep->dest         = talloc_steal(rep, src);
 182         rep->packet       = reply;
 183         talloc_steal(rep, reply.data);
 184
 185         if (rep->packet.data == NULL) {
 186                 talloc_free(rep);
 187                 talloc_free(tmp_ctx);
 188                 return;
 189         }
 190
 191         DLIST_ADD_END(kdc_socket->send_queue, rep, struct kdc_reply *);
 192         EVENT_FD_WRITEABLE(kdc_socket->fde);
 193         talloc_free(tmp_ctx);
 194 }
 195
 196 /*
 197   handle fd events on a KDC socket
 198 */
 199 static void kdc_socket_handler(struct event_context *ev, struct fd_event *fde,
 200                                uint16_t flags, void *private)
 201 {
 202         struct kdc_socket *kdc_socket = talloc_get_type(private, struct kdc_socket);
 203         if (flags & EVENT_FD_WRITE) {
 204                 kdc_send_handler(kdc_socket);
 205         }
 206         if (flags & EVENT_FD_READ) {
 207                 kdc_recv_handler(kdc_socket);
 208         }
 209 }
 210
 211 static void kdc_tcp_terminate_connection(struct kdc_tcp_connection *kdcconn, const char *reason)
 212 {
 213         stream_terminate_connection(kdcconn->conn, reason);
 214 }
 215
 216 /*
 217   receive a full packet on a KDC connection
 218 */
 219 static NTSTATUS kdc_tcp_recv(void *private, DATA_BLOB blob)
 220 {
 221         struct kdc_tcp_connection *kdcconn = talloc_get_type(private,
 222                                                              struct kdc_tcp_connection);
 223         NTSTATUS status = NT_STATUS_UNSUCCESSFUL;
 224         TALLOC_CTX *tmp_ctx = talloc_new(kdcconn);
 225         int ret;
 226         DATA_BLOB input, reply;
 227         struct socket_address *src_addr;
 228         struct socket_address *my_addr;
 229
 230         talloc_steal(tmp_ctx, blob.data);
 231
 232         src_addr = socket_get_peer_addr(kdcconn->conn->socket, tmp_ctx);
 233         if (!src_addr) {
 234                 talloc_free(tmp_ctx);
 235                 return NT_STATUS_NO_MEMORY;
 236         }
 237
 238         my_addr = socket_get_my_addr(kdcconn->conn->socket, tmp_ctx);
 239         if (!my_addr) {
 240                 talloc_free(tmp_ctx);
 241                 return NT_STATUS_NO_MEMORY;
 242         }
 243
 244         /* Call krb5 */
 245         input = data_blob_const(blob.data + 4, blob.length - 4);
 246
 247         ret = kdcconn->process(kdcconn->kdc,
 248                                tmp_ctx,
 249                                &input,
 250                                &reply,
 251                                src_addr,
 252                                my_addr,
 253                                0 /* Not datagram */);
 254         if (!ret) {
 255                 talloc_free(tmp_ctx);
 256                 return NT_STATUS_INTERNAL_ERROR;
 257         }
 258
 259         /* and now encode the reply */
 260         blob = data_blob_talloc(kdcconn, NULL, reply.length + 4);
 261         if (!blob.data) {
 262                 talloc_free(tmp_ctx);
 263                 return NT_STATUS_NO_MEMORY;
 264         }
 265
 266         RSIVAL(blob.data, 0, reply.length);
 267         memcpy(blob.data + 4, reply.data, reply.length);
 268
 269         status = packet_send(kdcconn->packet, blob);
 270         if (!NT_STATUS_IS_OK(status)) {
 271                 talloc_free(tmp_ctx);
 272                 return status;
 273         }
 274
 275         /* the call isn't needed any more */
 276         talloc_free(tmp_ctx);
 277         return NT_STATUS_OK;
 278 }
 279
 280 /*
 281   receive some data on a KDC connection
 282 */
 283 static void kdc_tcp_recv_handler(struct stream_connection *conn, uint16_t flags)
 284 {
 285         struct kdc_tcp_connection *kdcconn = talloc_get_type(conn->private,
 286                                                              struct kdc_tcp_connection);
 287         packet_recv(kdcconn->packet);
 288 }
 289
 290 /*
 291   called on a tcp recv error
 292 */
 293 static void kdc_tcp_recv_error(void *private, NTSTATUS status)
 294 {
 295         struct kdc_tcp_connection *kdcconn = talloc_get_type(private, struct kdc_tcp_connection);
 296         kdc_tcp_terminate_connection(kdcconn, nt_errstr(status));
 297 }
 298
 299 /*
 300   called when we can write to a connection
 301 */
 302 static void kdc_tcp_send(struct stream_connection *conn, uint16_t flags)
 303 {
 304         struct kdc_tcp_connection *kdcconn = talloc_get_type(conn->private,
 305                                                              struct kdc_tcp_connection);
 306         packet_queue_run(kdcconn->packet);
 307 }
 308
 309 /**
 310    Wrapper for krb5_kdc_process_krb5_request, converting to/from Samba
 311    calling conventions
 312 */
 313
 314 static bool kdc_process(struct kdc_server *kdc,
 315                         TALLOC_CTX *mem_ctx,
 316                         DATA_BLOB *input,
 317                         DATA_BLOB *reply,
 318                         struct socket_address *peer_addr,
 319                         struct socket_address *my_addr,
 320                         int datagram_reply)
 321 {
 322         int ret;
 323         krb5_data k5_reply;
 324         krb5_data_zero(&k5_reply);
 325
 326         krb5_kdc_update_time(NULL);
 327
 328         DEBUG(10,("Received KDC packet of length %lu from %s:%d\n",
 329                   (long)input->length - 4, peer_addr->addr, peer_addr->port));
 330
 331         ret = krb5_kdc_process_krb5_request(kdc->smb_krb5_context->krb5_context,
 332                                             kdc->config,
 333                                             input->data, input->length,
 334                                             &k5_reply,
 335                                             peer_addr->addr,
 336                                             peer_addr->sockaddr,
 337                                             datagram_reply);
 338         if (ret == -1) {
 339                 *reply = data_blob(NULL, 0);
 340                 return false;
 341         }
 342         if (k5_reply.length) {
 343                 *reply = data_blob_talloc(mem_ctx, k5_reply.data, k5_reply.length);
 344                 krb5_free_data_contents(kdc->smb_krb5_context->krb5_context, &k5_reply);
 345         } else {
 346                 *reply = data_blob(NULL, 0);
 347         }
 348         return true;
 349 }
 350
 351 /*
 352   called when we get a new connection
 353 */
 354 static void kdc_tcp_generic_accept(struct stream_connection *conn, kdc_process_fn_t process_fn)
 355 {
 356         struct kdc_server *kdc = talloc_get_type(conn->private, struct kdc_server);
 357         struct kdc_tcp_connection *kdcconn;
 358
 359         kdcconn = talloc_zero(conn, struct kdc_tcp_connection);
 360         if (!kdcconn) {
 361                 stream_terminate_connection(conn, "kdc_tcp_accept: out of memory");
 362                 return;
 363         }
 364         kdcconn->conn    = conn;
 365         kdcconn->kdc     = kdc;
 366         kdcconn->process = process_fn;
 367         conn->private    = kdcconn;
 368
 369         kdcconn->packet = packet_init(kdcconn);
 370         if (kdcconn->packet == NULL) {
 371                 kdc_tcp_terminate_connection(kdcconn, "kdc_tcp_accept: out of memory");
 372                 return;
 373         }
 374         packet_set_private(kdcconn->packet, kdcconn);
 375         packet_set_socket(kdcconn->packet, conn->socket);
 376         packet_set_callback(kdcconn->packet, kdc_tcp_recv);
 377         packet_set_full_request(kdcconn->packet, packet_full_request_u32);
 378         packet_set_error_handler(kdcconn->packet, kdc_tcp_recv_error);
 379         packet_set_event_context(kdcconn->packet, conn->event.ctx);
 380         packet_set_fde(kdcconn->packet, conn->event.fde);
 381         packet_set_serialise(kdcconn->packet);
 382 }
 383
 384 static void kdc_tcp_accept(struct stream_connection *conn)
 385 {
 386         kdc_tcp_generic_accept(conn, kdc_process);
 387 }
 388
 389 static const struct stream_server_ops kdc_tcp_stream_ops = {
 390         .name                   = "kdc_tcp",
 391         .accept_connection      = kdc_tcp_accept,
 392         .recv_handler           = kdc_tcp_recv_handler,
 393         .send_handler           = kdc_tcp_send
 394 };
 395
 396 static void kpasswdd_tcp_accept(struct stream_connection *conn)
 397 {
 398         kdc_tcp_generic_accept(conn, kpasswdd_process);
 399 }
 400
 401 static const struct stream_server_ops kpasswdd_tcp_stream_ops = {
 402         .name                   = "kpasswdd_tcp",
 403         .accept_connection      = kpasswdd_tcp_accept,
 404         .recv_handler           = kdc_tcp_recv_handler,
 405         .send_handler           = kdc_tcp_send
 406 };
 407
 408 /*
 409   start listening on the given address
 410 */
 411 static NTSTATUS kdc_add_socket(struct kdc_server *kdc, const char *address,
 412                                uint16_t kdc_port, uint16_t kpasswd_port)
 413 {
 414         const struct model_ops *model_ops;
 415         struct kdc_socket *kdc_socket;
 416         struct kdc_socket *kpasswd_socket;
 417         struct socket_address *kdc_address, *kpasswd_address;
 418         NTSTATUS status;
 419
 420         kdc_socket = talloc(kdc, struct kdc_socket);
 421         NT_STATUS_HAVE_NO_MEMORY(kdc_socket);
 422
 423         kpasswd_socket = talloc(kdc, struct kdc_socket);
 424         NT_STATUS_HAVE_NO_MEMORY(kpasswd_socket);
 425
 426         status = socket_create("ip", SOCKET_TYPE_DGRAM, &kdc_socket->sock, 0);
 427         if (!NT_STATUS_IS_OK(status)) {
 428                 talloc_free(kdc_socket);
 429                 return status;
 430         }
 431
 432         status = socket_create("ip", SOCKET_TYPE_DGRAM, &kpasswd_socket->sock, 0);
 433         if (!NT_STATUS_IS_OK(status)) {
 434                 talloc_free(kpasswd_socket);
 435                 return status;
 436         }
 437
 438         kdc_socket->kdc = kdc;
 439         kdc_socket->send_queue = NULL;
 440         kdc_socket->process = kdc_process;
 441
 442         talloc_steal(kdc_socket, kdc_socket->sock);
 443
 444         kdc_socket->fde = event_add_fd(kdc->task->event_ctx, kdc,
 445                                        socket_get_fd(kdc_socket->sock), EVENT_FD_READ,
 446                                        kdc_socket_handler, kdc_socket);
 447
 448         kdc_address = socket_address_from_strings(kdc_socket, kdc_socket->sock->backend_name,
 449                                                   address, kdc_port);
 450         NT_STATUS_HAVE_NO_MEMORY(kdc_address);
 451
 452         status = socket_listen(kdc_socket->sock, kdc_address, 0, 0);
 453         if (!NT_STATUS_IS_OK(status)) {
 454                 DEBUG(0,("Failed to bind to %s:%d UDP for kdc - %s\n",
 455                          address, kdc_port, nt_errstr(status)));
 456                 talloc_free(kdc_socket);
 457                 return status;
 458         }
 459
 460         kpasswd_socket->kdc = kdc;
 461         kpasswd_socket->send_queue = NULL;
 462         kpasswd_socket->process = kpasswdd_process;
 463
 464         talloc_steal(kpasswd_socket, kpasswd_socket->sock);
 465
 466         kpasswd_socket->fde = event_add_fd(kdc->task->event_ctx, kdc,
 467                                            socket_get_fd(kpasswd_socket->sock), EVENT_FD_READ,
 468                                            kdc_socket_handler, kpasswd_socket);
 469
 470         kpasswd_address = socket_address_from_strings(kpasswd_socket, kpasswd_socket->sock->backend_name,
 471                                                       address, kpasswd_port);
 472         NT_STATUS_HAVE_NO_MEMORY(kpasswd_address);
 473
 474         status = socket_listen(kpasswd_socket->sock, kpasswd_address, 0, 0);
 475         if (!NT_STATUS_IS_OK(status)) {
 476                 DEBUG(0,("Failed to bind to %s:%d UDP for kpasswd - %s\n",
 477                          address, kpasswd_port, nt_errstr(status)));
 478                 talloc_free(kpasswd_socket);
 479                 return status;
 480         }
 481
 482         /* within the kdc task we want to be a single process, so
 483            ask for the single process model ops and pass these to the
 484            stream_setup_socket() call. */
 485         model_ops = process_model_byname("single");
 486         if (!model_ops) {
 487                 DEBUG(0,("Can't find 'single' process model_ops\n"));
 488                 talloc_free(kdc_socket);
 489                 return NT_STATUS_INTERNAL_ERROR;
 490         }
 491
 492         status = stream_setup_socket(kdc->task->event_ctx, model_ops,
 493                                      &kdc_tcp_stream_ops,
 494                                      "ip", address, &kdc_port, kdc);
 495         if (!NT_STATUS_IS_OK(status)) {
 496                 DEBUG(0,("Failed to bind to %s:%u TCP - %s\n",
 497                          address, kdc_port, nt_errstr(status)));
 498                 talloc_free(kdc_socket);
 499                 return status;
 500         }
 501
 502         status = stream_setup_socket(kdc->task->event_ctx, model_ops,
 503                                      &kpasswdd_tcp_stream_ops,
 504                                      "ip", address, &kpasswd_port, kdc);
 505         if (!NT_STATUS_IS_OK(status)) {
 506                 DEBUG(0,("Failed to bind to %s:%u TCP - %s\n",
 507                          address, kpasswd_port, nt_errstr(status)));
 508                 talloc_free(kdc_socket);
 509                 return status;
 510         }
 511
 512         return NT_STATUS_OK;
 513 }
 514
 515
 516 /*
 517   setup our listening sockets on the configured network interfaces
 518 */
 519 static NTSTATUS kdc_startup_interfaces(struct kdc_server *kdc)
 520 {
 521         int num_interfaces = iface_count();
 522         TALLOC_CTX *tmp_ctx = talloc_new(kdc);
 523         NTSTATUS status;
 524
 525         int i;
 526
 527         for (i=0; i<num_interfaces; i++) {
 528                 const char *address = talloc_strdup(tmp_ctx, iface_n_ip(i));
 529                 status = kdc_add_socket(kdc, address, lp_krb5_port(global_loadparm),
 530                                         lp_kpasswd_port(global_loadparm));
 531                 NT_STATUS_NOT_OK_RETURN(status);
 532         }
 533
 534         talloc_free(tmp_ctx);
 535
 536         return NT_STATUS_OK;
 537 }
 538
 539 static struct krb5plugin_windc_ftable windc_plugin_table = {
 540         .minor_version = KRB5_WINDC_PLUGING_MINOR,
 541         .init = samba_kdc_plugin_init,
 542         .fini = samba_kdc_plugin_fini,
 543         .pac_generate = samba_kdc_get_pac,
 544         .pac_verify = samba_kdc_reget_pac,
 545         .client_access = samba_kdc_check_client_access,
 546 };
 547
 548
 549 /*
 550   startup the kdc task
 551 */
 552 static void kdc_task_init(struct task_server *task)
 553 {
 554         struct kdc_server *kdc;
 555         NTSTATUS status;
 556         krb5_error_code ret;
 557
 558         switch (lp_server_role(global_loadparm)) {
 559         case ROLE_STANDALONE:
 560                 task_server_terminate(task, "kdc: no KDC required in standalone configuration");
 561                 return;
 562         case ROLE_DOMAIN_MEMBER:
 563                 task_server_terminate(task, "kdc: no KDC required in member server configuration");
 564                 return;
 565         case ROLE_DOMAIN_CONTROLLER:
 566                 /* Yes, we want a KDC */
 567                 break;
 568         }
 569
 570         if (iface_count() == 0) {
 571                 task_server_terminate(task, "kdc: no network interfaces configured");
 572                 return;
 573         }
 574
 575         task_server_set_title(task, "task[kdc]");
 576
 577         kdc = talloc(task, struct kdc_server);
 578         if (kdc == NULL) {
 579                 task_server_terminate(task, "kdc: out of memory");
 580                 return;
 581         }
 582
 583         kdc->task = task;
 584
 585         initialize_krb5_error_table();
 586
 587         ret = smb_krb5_init_context(kdc, task->event_ctx, &kdc->smb_krb5_context);
 588         if (ret) {
 589                 DEBUG(1,("kdc_task_init: krb5_init_context failed (%s)\n",
 590                          error_message(ret)));
 591                 task_server_terminate(task, "kdc: krb5_init_context failed");
 592                 return;
 593         }
 594
 595         krb5_add_et_list(kdc->smb_krb5_context->krb5_context, initialize_hdb_error_table_r);
 596
 597         ret = krb5_kdc_get_config(kdc->smb_krb5_context->krb5_context,
 598                                   &kdc->config);
 599         if(ret) {
 600                 task_server_terminate(task, "kdc: failed to get KDC configuration");
 601                 return;
 602         }
 603
 604         kdc->config->logf = kdc->smb_krb5_context->logf;
 605         kdc->config->db = talloc(kdc, struct HDB *);
 606         if (!kdc->config->db) {
 607                 task_server_terminate(task, "kdc: out of memory");
 608                 return;
 609         }
 610         kdc->config->num_db = 1;
 611
 612         status = kdc_hdb_ldb_create(kdc, kdc->smb_krb5_context->krb5_context,
 613                                     &kdc->config->db[0], NULL);
 614         if (!NT_STATUS_IS_OK(status)) {
 615                 task_server_terminate(task, "kdc: hdb_ldb_create (setup KDC database) failed");
 616                 return;
 617         }
 618
 619         ret = krb5_kt_register(kdc->smb_krb5_context->krb5_context, &hdb_kt_ops);
 620         if(ret) {
 621                 task_server_terminate(task, "kdc: failed to register hdb keytab");
 622                 return;
 623         }
 624
 625         /* Registar WinDC hooks */
 626         ret = _krb5_plugin_register(kdc->smb_krb5_context->krb5_context,
 627                                     PLUGIN_TYPE_DATA, "windc",
 628                                     &windc_plugin_table);
 629         if(ret) {
 630                 task_server_terminate(task, "kdc: failed to register hdb keytab");
 631                 return;
 632         }
 633
 634         krb5_kdc_windc_init(kdc->smb_krb5_context->krb5_context);
 635
 636         kdc_mem_ctx = kdc->smb_krb5_context;
 637
 638         /* start listening on the configured network interfaces */
 639         status = kdc_startup_interfaces(kdc);
 640         if (!NT_STATUS_IS_OK(status)) {
 641                 task_server_terminate(task, "kdc failed to setup interfaces");
 642                 return;
 643         }
 644
 645         irpc_add_name(task->msg_ctx, "kdc_server");
 646 }
 647
 648
 649 /*
 650   called on startup of the KDC service
 651 */
 652 static NTSTATUS kdc_init(struct event_context *event_ctx,
 653                          const struct model_ops *model_ops)
 654 {
 655         return task_server_startup(event_ctx, model_ops, kdc_task_init);
 656 }
 657
 658 /* called at smbd startup - register ourselves as a server service */
 659 NTSTATUS server_service_kdc_init(void)
 660 {
 661         return register_server_service("kdc", kdc_init);
 662 }