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_generic_accept(struct stream_connection *conn, kdc_process_fn_t process_fn)
 359 {
 360         struct kdc_server *kdc = talloc_get_type(conn->private_data, struct kdc_server);
 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;
 370         kdcconn->process = process_fn;
 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 void kdc_tcp_accept(struct stream_connection *conn)
 389 {
 390         kdc_tcp_generic_accept(conn, kdc_process);
 391 }
 392
 393 static const struct stream_server_ops kdc_tcp_stream_ops = {
 394         .name                   = "kdc_tcp",
 395         .accept_connection      = kdc_tcp_accept,
 396         .recv_handler           = kdc_tcp_recv_handler,
 397         .send_handler           = kdc_tcp_send
 398 };
 399
 400 static void kpasswdd_tcp_accept(struct stream_connection *conn)
 401 {
 402         kdc_tcp_generic_accept(conn, kpasswdd_process);
 403 }
 404
 405 static const struct stream_server_ops kpasswdd_tcp_stream_ops = {
 406         .name                   = "kpasswdd_tcp",
 407         .accept_connection      = kpasswdd_tcp_accept,
 408         .recv_handler           = kdc_tcp_recv_handler,
 409         .send_handler           = kdc_tcp_send
 410 };
 411
 412 /*
 413   start listening on the given address
 414 */
 415 static NTSTATUS kdc_add_kdc_socket(struct kdc_server *kdc,
 416                                const struct model_ops *model_ops,
 417                                const char *address,
 418                                uint16_t kdc_port)
 419 {
 420         struct kdc_socket *kdc_socket;
 421         struct socket_address *kdc_address;
 422         NTSTATUS status;
 423
 424         kdc_socket = talloc(kdc, struct kdc_socket);
 425         NT_STATUS_HAVE_NO_MEMORY(kdc_socket);
 426
 427         status = socket_create("ip", SOCKET_TYPE_DGRAM, &kdc_socket->sock, 0);
 428         if (!NT_STATUS_IS_OK(status)) {
 429                 talloc_free(kdc_socket);
 430                 return status;
 431         }
 432
 433         kdc_socket->kdc = kdc;
 434         kdc_socket->send_queue = NULL;
 435         kdc_socket->process = kdc_process;
 436
 437         talloc_steal(kdc_socket, kdc_socket->sock);
 438
 439         kdc_socket->fde = event_add_fd(kdc->task->event_ctx, kdc,
 440                                        socket_get_fd(kdc_socket->sock), EVENT_FD_READ,
 441                                        kdc_socket_handler, kdc_socket);
 442
 443         kdc_address = socket_address_from_strings(kdc_socket, kdc_socket->sock->backend_name,
 444                                                   address, kdc_port);
 445         NT_STATUS_HAVE_NO_MEMORY(kdc_address);
 446
 447         status = socket_listen(kdc_socket->sock, kdc_address, 0, 0);
 448         if (!NT_STATUS_IS_OK(status)) {
 449                 DEBUG(0,("Failed to bind to %s:%d UDP for kdc - %s\n",
 450                          address, kdc_port, nt_errstr(status)));
 451                 talloc_free(kdc_socket);
 452                 return status;
 453         }
 454
 455         status = stream_setup_socket(kdc->task->event_ctx,
 456                                      kdc->task->lp_ctx,
 457                                      model_ops,
 458                                      &kdc_tcp_stream_ops,
 459                                      "ip", address, &kdc_port,
 460                                      lp_socket_options(kdc->task->lp_ctx),
 461                                      kdc);
 462         if (!NT_STATUS_IS_OK(status)) {
 463                 DEBUG(0,("Failed to bind to %s:%u TCP - %s\n",
 464                          address, kdc_port, nt_errstr(status)));
 465                 talloc_free(kdc_socket);
 466                 return status;
 467         }
 468
 469         return NT_STATUS_OK;
 470 }
 471
 472 static NTSTATUS kdc_add_kpasswd_socket(struct kdc_server *kdc,
 473                                const struct model_ops *model_ops,
 474                                const char *address,
 475                                uint16_t kpasswd_port)
 476 {
 477         struct kdc_socket *kpasswd_socket;
 478         struct socket_address *kpasswd_address;
 479         NTSTATUS status;
 480
 481         kpasswd_socket = talloc(kdc, struct kdc_socket);
 482         NT_STATUS_HAVE_NO_MEMORY(kpasswd_socket);
 483
 484         status = socket_create("ip", SOCKET_TYPE_DGRAM, &kpasswd_socket->sock, 0);
 485         if (!NT_STATUS_IS_OK(status)) {
 486                 talloc_free(kpasswd_socket);
 487                 return status;
 488         }
 489
 490         kpasswd_socket->kdc = kdc;
 491         kpasswd_socket->send_queue = NULL;
 492         kpasswd_socket->process = kpasswdd_process;
 493
 494         talloc_steal(kpasswd_socket, kpasswd_socket->sock);
 495
 496         kpasswd_socket->fde = event_add_fd(kdc->task->event_ctx, kdc,
 497                                            socket_get_fd(kpasswd_socket->sock), EVENT_FD_READ,
 498                                            kdc_socket_handler, kpasswd_socket);
 499
 500         kpasswd_address = socket_address_from_strings(kpasswd_socket, kpasswd_socket->sock->backend_name,
 501                                                       address, kpasswd_port);
 502         NT_STATUS_HAVE_NO_MEMORY(kpasswd_address);
 503
 504         status = socket_listen(kpasswd_socket->sock, kpasswd_address, 0, 0);
 505         if (!NT_STATUS_IS_OK(status)) {
 506                 DEBUG(0,("Failed to bind to %s:%d UDP for kpasswd - %s\n",
 507                          address, kpasswd_port, nt_errstr(status)));
 508                 talloc_free(kpasswd_socket);
 509                 return status;
 510         }
 511
 512         status = stream_setup_socket(kdc->task->event_ctx,
 513                                      kdc->task->lp_ctx,
 514                                      model_ops,
 515                                      &kpasswdd_tcp_stream_ops,
 516                                      "ip", address, &kpasswd_port,
 517                                      lp_socket_options(kdc->task->lp_ctx),
 518                                      kdc);
 519         if (!NT_STATUS_IS_OK(status)) {
 520                 DEBUG(0,("Failed to bind to %s:%u TCP - %s\n",
 521                          address, kpasswd_port, nt_errstr(status)));
 522                 talloc_free(kpasswd_socket);
 523                 return status;
 524         }
 525
 526         return NT_STATUS_OK;
 527 }
 528
 529
 530 /*
 531   setup our listening sockets on the configured network interfaces
 532 */
 533 static NTSTATUS kdc_startup_interfaces(struct kdc_server *kdc, struct loadparm_context *lp_ctx,
 534                                        struct interface *ifaces)
 535 {
 536         const struct model_ops *model_ops;
 537         int num_interfaces;
 538         TALLOC_CTX *tmp_ctx = talloc_new(kdc);
 539         NTSTATUS status;
 540         int i;
 541
 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");
 546         if (!model_ops) {
 547                 DEBUG(0,("Can't find 'single' process model_ops\n"));
 548                 return NT_STATUS_INTERNAL_ERROR;
 549         }
 550
 551         num_interfaces = iface_count(ifaces);
 552
 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);
 557
 558                 if (kdc_port) {
 559                         status = kdc_add_kdc_socket(kdc, model_ops, address, kdc_port);
 560                         NT_STATUS_NOT_OK_RETURN(status);
 561                 }
 562
 563                 if (kpasswd_port) {
 564                         status = kdc_add_kpasswd_socket(kdc, model_ops, address, kpasswd_port);
 565                         NT_STATUS_NOT_OK_RETURN(status);
 566                 }
 567         }
 568
 569         talloc_free(tmp_ctx);
 570
 571         return NT_STATUS_OK;
 572 }
 573
 574
 575 static NTSTATUS kdc_check_generic_kerberos(struct irpc_message *msg,
 576                                  struct kdc_check_generic_kerberos *r)
 577 {
 578         struct PAC_Validate pac_validate;
 579         DATA_BLOB srv_sig;
 580         struct PAC_SIGNATURE_DATA kdc_sig;
 581         struct kdc_server *kdc = talloc_get_type(msg->private_data, struct kdc_server);
 582         enum ndr_err_code ndr_err;
 583         krb5_enctype etype;
 584         int ret;
 585         hdb_entry_ex ent;
 586         krb5_principal principal;
 587         krb5_keyblock keyblock;
 588         Key *key;
 589
 590         /* There is no reply to this request */
 591         r->out.generic_reply = data_blob(NULL, 0);
 592
 593         ndr_err = ndr_pull_struct_blob(&r->in.generic_request, msg,
 594                                        lp_iconv_convenience(kdc->task->lp_ctx),
 595                                        &pac_validate,
 596                                        (ndr_pull_flags_fn_t)ndr_pull_PAC_Validate);
 597         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
 598                 return NT_STATUS_INVALID_PARAMETER;
 599         }
 600
 601         if (pac_validate.MessageType != 3) {
 602                 /* We don't implement any other message types - such as certificate validation - yet */
 603                 return NT_STATUS_INVALID_PARAMETER;
 604         }
 605
 606         if (pac_validate.ChecksumAndSignature.length != (pac_validate.ChecksumLength + pac_validate.SignatureLength)
 607             || pac_validate.ChecksumAndSignature.length < pac_validate.ChecksumLength
 608             || pac_validate.ChecksumAndSignature.length < pac_validate.SignatureLength ) {
 609                 return NT_STATUS_INVALID_PARAMETER;
 610         }
 611
 612         srv_sig = data_blob_const(pac_validate.ChecksumAndSignature.data,
 613                                   pac_validate.ChecksumLength);
 614
 615         if (pac_validate.SignatureType == CKSUMTYPE_HMAC_MD5) {
 616                 etype = ETYPE_ARCFOUR_HMAC_MD5;
 617         } else {
 618                 ret = krb5_cksumtype_to_enctype(kdc->smb_krb5_context->krb5_context, pac_validate.SignatureType,
 619                                                 &etype);
 620                 if (ret != 0) {
 621                         return NT_STATUS_LOGON_FAILURE;
 622                 }
 623         }
 624
 625         ret = krb5_make_principal(kdc->smb_krb5_context->krb5_context, &principal,
 626                                   lp_realm(kdc->task->lp_ctx),
 627                                   "krbtgt", lp_realm(kdc->task->lp_ctx),
 628                                   NULL);
 629
 630         if (ret != 0) {
 631                 return NT_STATUS_NO_MEMORY;
 632         }
 633
 634         ret = kdc->config->db[0]->hdb_fetch(kdc->smb_krb5_context->krb5_context,
 635                                             kdc->config->db[0],
 636                                             principal,
 637                                             HDB_F_GET_KRBTGT | HDB_F_DECRYPT,
 638                                             &ent);
 639
 640         if (ret != 0) {
 641                 hdb_free_entry(kdc->smb_krb5_context->krb5_context, &ent);
 642                 krb5_free_principal(kdc->smb_krb5_context->krb5_context, principal);
 643
 644                 return NT_STATUS_LOGON_FAILURE;
 645         }
 646
 647         ret = hdb_enctype2key(kdc->smb_krb5_context->krb5_context, &ent.entry, etype, &key);
 648
 649         if (ret != 0) {
 650                 hdb_free_entry(kdc->smb_krb5_context->krb5_context, &ent);
 651                 krb5_free_principal(kdc->smb_krb5_context->krb5_context, principal);
 652                 return NT_STATUS_LOGON_FAILURE;
 653         }
 654
 655         keyblock = key->key;
 656
 657         kdc_sig.type = pac_validate.SignatureType;
 658         kdc_sig.signature = data_blob_const(&pac_validate.ChecksumAndSignature.data[pac_validate.ChecksumLength],
 659                                             pac_validate.SignatureLength);
 660         ret = check_pac_checksum(msg, srv_sig, &kdc_sig,
 661                            kdc->smb_krb5_context->krb5_context, &keyblock);
 662
 663         hdb_free_entry(kdc->smb_krb5_context->krb5_context, &ent);
 664         krb5_free_principal(kdc->smb_krb5_context->krb5_context, principal);
 665
 666         if (ret != 0) {
 667                 return NT_STATUS_LOGON_FAILURE;
 668         }
 669
 670         return NT_STATUS_OK;
 671 }
 672
 673
 674 /*
 675   startup the kdc task
 676 */
 677 static void kdc_task_init(struct task_server *task)
 678 {
 679         struct kdc_server *kdc;
 680         NTSTATUS status;
 681         krb5_error_code ret;
 682         struct interface *ifaces;
 683
 684         switch (lp_server_role(task->lp_ctx)) {
 685         case ROLE_STANDALONE:
 686                 task_server_terminate(task, "kdc: no KDC required in standalone configuration", false);
 687                 return;
 688         case ROLE_DOMAIN_MEMBER:
 689                 task_server_terminate(task, "kdc: no KDC required in member server configuration", false);
 690                 return;
 691         case ROLE_DOMAIN_CONTROLLER:
 692                 /* Yes, we want a KDC */
 693                 break;
 694         }
 695
 696         load_interfaces(task, lp_interfaces(task->lp_ctx), &ifaces);
 697
 698         if (iface_count(ifaces) == 0) {
 699                 task_server_terminate(task, "kdc: no network interfaces configured", false);
 700                 return;
 701         }
 702
 703         task_server_set_title(task, "task[kdc]");
 704
 705         kdc = talloc(task, struct kdc_server);
 706         if (kdc == NULL) {
 707                 task_server_terminate(task, "kdc: out of memory", true);
 708                 return;
 709         }
 710
 711         kdc->task = task;
 712
 713         initialize_krb5_error_table();
 714
 715         ret = smb_krb5_init_context(kdc, task->event_ctx, task->lp_ctx, &kdc->smb_krb5_context);
 716         if (ret) {
 717                 DEBUG(1,("kdc_task_init: krb5_init_context failed (%s)\n",
 718                          error_message(ret)));
 719                 task_server_terminate(task, "kdc: krb5_init_context failed", true);
 720                 return;
 721         }
 722
 723         krb5_add_et_list(kdc->smb_krb5_context->krb5_context, initialize_hdb_error_table_r);
 724
 725         ret = krb5_kdc_get_config(kdc->smb_krb5_context->krb5_context,
 726                                   &kdc->config);
 727         if(ret) {
 728                 task_server_terminate(task, "kdc: failed to get KDC configuration", true);
 729                 return;
 730         }
 731
 732         kdc->config->logf = kdc->smb_krb5_context->logf;
 733         kdc->config->db = talloc(kdc, struct HDB *);
 734         if (!kdc->config->db) {
 735                 task_server_terminate(task, "kdc: out of memory", true);
 736                 return;
 737         }
 738         kdc->config->num_db = 1;
 739
 740         status = hdb_samba4_create_kdc(kdc, task->event_ctx, task->lp_ctx,
 741                                        kdc->smb_krb5_context->krb5_context,
 742                                        &kdc->config->db[0]);
 743         if (!NT_STATUS_IS_OK(status)) {
 744                 task_server_terminate(task, "kdc: hdb_samba4_create_kdc (setup KDC database) failed", true);
 745                 return;
 746         }
 747
 748         /* Register hdb-samba4 hooks for use as a keytab */
 749
 750         kdc->hdb_samba4_context = talloc(kdc, struct hdb_samba4_context);
 751         if (!kdc->hdb_samba4_context) {
 752                 task_server_terminate(task, "kdc: out of memory", true);
 753                 return;
 754         }
 755
 756         kdc->hdb_samba4_context->ev_ctx = task->event_ctx;
 757         kdc->hdb_samba4_context->lp_ctx = task->lp_ctx;
 758
 759         ret = krb5_plugin_register(kdc->smb_krb5_context->krb5_context,
 760                                    PLUGIN_TYPE_DATA, "hdb",
 761                                    &hdb_samba4);
 762         if(ret) {
 763                 task_server_terminate(task, "kdc: failed to register hdb keytab", true);
 764                 return;
 765         }
 766
 767         ret = krb5_kt_register(kdc->smb_krb5_context->krb5_context, &hdb_kt_ops);
 768         if(ret) {
 769                 task_server_terminate(task, "kdc: failed to register hdb keytab", true);
 770                 return;
 771         }
 772
 773         /* Registar WinDC hooks */
 774         ret = krb5_plugin_register(kdc->smb_krb5_context->krb5_context,
 775                                    PLUGIN_TYPE_DATA, "windc",
 776                                    &windc_plugin_table);
 777         if(ret) {
 778                 task_server_terminate(task, "kdc: failed to register hdb keytab", true);
 779                 return;
 780         }
 781
 782         krb5_kdc_windc_init(kdc->smb_krb5_context->krb5_context);
 783
 784         /* start listening on the configured network interfaces */
 785         status = kdc_startup_interfaces(kdc, task->lp_ctx, ifaces);
 786         if (!NT_STATUS_IS_OK(status)) {
 787                 task_server_terminate(task, "kdc failed to setup interfaces", true);
 788                 return;
 789         }
 790
 791         status = IRPC_REGISTER(task->msg_ctx, irpc, KDC_CHECK_GENERIC_KERBEROS,
 792                                kdc_check_generic_kerberos, kdc);
 793         if (!NT_STATUS_IS_OK(status)) {
 794                 task_server_terminate(task, "nbtd failed to setup monitoring", true);
 795                 return;
 796         }
 797
 798         irpc_add_name(task->msg_ctx, "kdc_server");
 799 }
 800
 801
 802 /* called at smbd startup - register ourselves as a server service */
 803 NTSTATUS server_service_kdc_init(void)
 804 {
 805         return register_server_service("kdc", kdc_task_init);
 806 }