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 *kdc_mem_ctx;
  47 struct loadparm_context *kdc_lp_ctx;
  48
  49 /* hold all the info needed to send a reply */
  50 struct kdc_reply {
  51         struct kdc_reply *next, *prev;
  52         struct socket_address *dest;
  53         DATA_BLOB packet;
  54 };
  55
  56 typedef bool (*kdc_process_fn_t)(struct kdc_server *kdc,
  57                                  TALLOC_CTX *mem_ctx,
  58                                  DATA_BLOB *input,
  59                                  DATA_BLOB *reply,
  60                                  struct socket_address *peer_addr,
  61                                  struct socket_address *my_addr,
  62                                  int datagram);
  63
  64 /* hold information about one kdc socket */
  65 struct kdc_socket {
  66         struct socket_context *sock;
  67         struct kdc_server *kdc;
  68         struct fd_event *fde;
  69
  70         /* a queue of outgoing replies that have been deferred */
  71         struct kdc_reply *send_queue;
  72
  73         kdc_process_fn_t process;
  74 };
  75 /*
  76   state of an open tcp connection
  77 */
  78 struct kdc_tcp_connection {
  79         /* stream connection we belong to */
  80         struct stream_connection *conn;
  81
  82         /* the kdc_server the connection belongs to */
  83         struct kdc_server *kdc;
  84
  85         struct packet_context *packet;
  86
  87         kdc_process_fn_t process;
  88 };
  89
  90 /*
  91   handle fd send events on a KDC socket
  92 */
  93 static void kdc_send_handler(struct kdc_socket *kdc_socket)
  94 {
  95         while (kdc_socket->send_queue) {
  96                 struct kdc_reply *rep = kdc_socket->send_queue;
  97                 NTSTATUS status;
  98                 size_t sendlen;
  99
 100                 status = socket_sendto(kdc_socket->sock, &rep->packet, &sendlen,
 101                                        rep->dest);
 102                 if (NT_STATUS_EQUAL(status, STATUS_MORE_ENTRIES)) {
 103                         break;
 104                 }
 105                 if (NT_STATUS_EQUAL(status, NT_STATUS_INVALID_BUFFER_SIZE)) {
 106                         /* Replace with a krb err, response to big */
 107                 }
 108
 109                 DLIST_REMOVE(kdc_socket->send_queue, rep);
 110                 talloc_free(rep);
 111         }
 112
 113         if (kdc_socket->send_queue == NULL) {
 114                 EVENT_FD_NOT_WRITEABLE(kdc_socket->fde);
 115         }
 116 }
 117
 118
 119 /*
 120   handle fd recv events on a KDC socket
 121 */
 122 static void kdc_recv_handler(struct kdc_socket *kdc_socket)
 123 {
 124         NTSTATUS status;
 125         TALLOC_CTX *tmp_ctx = talloc_new(kdc_socket);
 126         DATA_BLOB blob;
 127         struct kdc_reply *rep;
 128         DATA_BLOB reply;
 129         size_t nread, dsize;
 130         struct socket_address *src;
 131         struct socket_address *my_addr;
 132         int ret;
 133
 134         status = socket_pending(kdc_socket->sock, &dsize);
 135         if (!NT_STATUS_IS_OK(status)) {
 136                 talloc_free(tmp_ctx);
 137                 return;
 138         }
 139
 140         blob = data_blob_talloc(tmp_ctx, NULL, dsize);
 141         if (blob.data == NULL) {
 142                 /* hope this is a temporary low memory condition */
 143                 talloc_free(tmp_ctx);
 144                 return;
 145         }
 146
 147         status = socket_recvfrom(kdc_socket->sock, blob.data, blob.length, &nread,
 148                                  tmp_ctx, &src);
 149         if (!NT_STATUS_IS_OK(status)) {
 150                 talloc_free(tmp_ctx);
 151                 return;
 152         }
 153         blob.length = nread;
 154
 155         DEBUG(10,("Received krb5 UDP packet of length %lu from %s:%u\n",
 156                  (long)blob.length, src->addr, (uint16_t)src->port));
 157
 158         my_addr = socket_get_my_addr(kdc_socket->sock, tmp_ctx);
 159         if (!my_addr) {
 160                 talloc_free(tmp_ctx);
 161                 return;
 162         }
 163
 164
 165         /* Call krb5 */
 166         ret = kdc_socket->process(kdc_socket->kdc,
 167                                   tmp_ctx,
 168                                   &blob,
 169                                   &reply,
 170                                   src, my_addr,
 171                                   1 /* Datagram */);
 172         if (!ret) {
 173                 talloc_free(tmp_ctx);
 174                 return;
 175         }
 176
 177         /* queue a pending reply */
 178         rep = talloc(kdc_socket, struct kdc_reply);
 179         if (rep == NULL) {
 180                 talloc_free(tmp_ctx);
 181                 return;
 182         }
 183         rep->dest         = talloc_steal(rep, src);
 184         rep->packet       = reply;
 185         talloc_steal(rep, reply.data);
 186
 187         if (rep->packet.data == NULL) {
 188                 talloc_free(rep);
 189                 talloc_free(tmp_ctx);
 190                 return;
 191         }
 192
 193         DLIST_ADD_END(kdc_socket->send_queue, rep, struct kdc_reply *);
 194         EVENT_FD_WRITEABLE(kdc_socket->fde);
 195         talloc_free(tmp_ctx);
 196 }
 197
 198 /*
 199   handle fd events on a KDC socket
 200 */
 201 static void kdc_socket_handler(struct event_context *ev, struct fd_event *fde,
 202                                uint16_t flags, void *private)
 203 {
 204         struct kdc_socket *kdc_socket = talloc_get_type(private, struct kdc_socket);
 205         if (flags & EVENT_FD_WRITE) {
 206                 kdc_send_handler(kdc_socket);
 207         }
 208         if (flags & EVENT_FD_READ) {
 209                 kdc_recv_handler(kdc_socket);
 210         }
 211 }
 212
 213 static void kdc_tcp_terminate_connection(struct kdc_tcp_connection *kdcconn, const char *reason)
 214 {
 215         stream_terminate_connection(kdcconn->conn, reason);
 216 }
 217
 218 /*
 219   receive a full packet on a KDC connection
 220 */
 221 static NTSTATUS kdc_tcp_recv(void *private, DATA_BLOB blob)
 222 {
 223         struct kdc_tcp_connection *kdcconn = talloc_get_type(private,
 224                                                              struct kdc_tcp_connection);
 225         NTSTATUS status = NT_STATUS_UNSUCCESSFUL;
 226         TALLOC_CTX *tmp_ctx = talloc_new(kdcconn);
 227         int ret;
 228         DATA_BLOB input, reply;
 229         struct socket_address *src_addr;
 230         struct socket_address *my_addr;
 231
 232         talloc_steal(tmp_ctx, blob.data);
 233
 234         src_addr = socket_get_peer_addr(kdcconn->conn->socket, tmp_ctx);
 235         if (!src_addr) {
 236                 talloc_free(tmp_ctx);
 237                 return NT_STATUS_NO_MEMORY;
 238         }
 239
 240         my_addr = socket_get_my_addr(kdcconn->conn->socket, tmp_ctx);
 241         if (!my_addr) {
 242                 talloc_free(tmp_ctx);
 243                 return NT_STATUS_NO_MEMORY;
 244         }
 245
 246         /* Call krb5 */
 247         input = data_blob_const(blob.data + 4, blob.length - 4);
 248
 249         ret = kdcconn->process(kdcconn->kdc,
 250                                tmp_ctx,
 251                                &input,
 252                                &reply,
 253                                src_addr,
 254                                my_addr,
 255                                0 /* Not datagram */);
 256         if (!ret) {
 257                 talloc_free(tmp_ctx);
 258                 return NT_STATUS_INTERNAL_ERROR;
 259         }
 260
 261         /* and now encode the reply */
 262         blob = data_blob_talloc(kdcconn, NULL, reply.length + 4);
 263         if (!blob.data) {
 264                 talloc_free(tmp_ctx);
 265                 return NT_STATUS_NO_MEMORY;
 266         }
 267
 268         RSIVAL(blob.data, 0, reply.length);
 269         memcpy(blob.data + 4, reply.data, reply.length);
 270
 271         status = packet_send(kdcconn->packet, blob);
 272         if (!NT_STATUS_IS_OK(status)) {
 273                 talloc_free(tmp_ctx);
 274                 return status;
 275         }
 276
 277         /* the call isn't needed any more */
 278         talloc_free(tmp_ctx);
 279         return NT_STATUS_OK;
 280 }
 281
 282 /*
 283   receive some data on a KDC connection
 284 */
 285 static void kdc_tcp_recv_handler(struct stream_connection *conn, uint16_t flags)
 286 {
 287         struct kdc_tcp_connection *kdcconn = talloc_get_type(conn->private,
 288                                                              struct kdc_tcp_connection);
 289         packet_recv(kdcconn->packet);
 290 }
 291
 292 /*
 293   called on a tcp recv error
 294 */
 295 static void kdc_tcp_recv_error(void *private, NTSTATUS status)
 296 {
 297         struct kdc_tcp_connection *kdcconn = talloc_get_type(private, struct kdc_tcp_connection);
 298         kdc_tcp_terminate_connection(kdcconn, nt_errstr(status));
 299 }
 300
 301 /*
 302   called when we can write to a connection
 303 */
 304 static void kdc_tcp_send(struct stream_connection *conn, uint16_t flags)
 305 {
 306         struct kdc_tcp_connection *kdcconn = talloc_get_type(conn->private,
 307                                                              struct kdc_tcp_connection);
 308         packet_queue_run(kdcconn->packet);
 309 }
 310
 311 /**
 312    Wrapper for krb5_kdc_process_krb5_request, converting to/from Samba
 313    calling conventions
 314 */
 315
 316 static bool kdc_process(struct kdc_server *kdc,
 317                         TALLOC_CTX *mem_ctx,
 318                         DATA_BLOB *input,
 319                         DATA_BLOB *reply,
 320                         struct socket_address *peer_addr,
 321                         struct socket_address *my_addr,
 322                         int datagram_reply)
 323 {
 324         int ret;
 325         krb5_data k5_reply;
 326         krb5_data_zero(&k5_reply);
 327
 328         krb5_kdc_update_time(NULL);
 329
 330         DEBUG(10,("Received KDC packet of length %lu from %s:%d\n",
 331                   (long)input->length - 4, peer_addr->addr, peer_addr->port));
 332
 333         ret = krb5_kdc_process_krb5_request(kdc->smb_krb5_context->krb5_context,
 334                                             kdc->config,
 335                                             input->data, input->length,
 336                                             &k5_reply,
 337                                             peer_addr->addr,
 338                                             peer_addr->sockaddr,
 339                                             datagram_reply);
 340         if (ret == -1) {
 341                 *reply = data_blob(NULL, 0);
 342                 return false;
 343         }
 344         if (k5_reply.length) {
 345                 *reply = data_blob_talloc(mem_ctx, k5_reply.data, k5_reply.length);
 346                 krb5_free_data_contents(kdc->smb_krb5_context->krb5_context, &k5_reply);
 347         } else {
 348                 *reply = data_blob(NULL, 0);
 349         }
 350         return true;
 351 }
 352
 353 /*
 354   called when we get a new connection
 355 */
 356 static void kdc_tcp_generic_accept(struct stream_connection *conn, kdc_process_fn_t process_fn)
 357 {
 358         struct kdc_server *kdc = talloc_get_type(conn->private, struct kdc_server);
 359         struct kdc_tcp_connection *kdcconn;
 360
 361         kdcconn = talloc_zero(conn, struct kdc_tcp_connection);
 362         if (!kdcconn) {
 363                 stream_terminate_connection(conn, "kdc_tcp_accept: out of memory");
 364                 return;
 365         }
 366         kdcconn->conn    = conn;
 367         kdcconn->kdc     = kdc;
 368         kdcconn->process = process_fn;
 369         conn->private    = kdcconn;
 370
 371         kdcconn->packet = packet_init(kdcconn);
 372         if (kdcconn->packet == NULL) {
 373                 kdc_tcp_terminate_connection(kdcconn, "kdc_tcp_accept: out of memory");
 374                 return;
 375         }
 376         packet_set_private(kdcconn->packet, kdcconn);
 377         packet_set_socket(kdcconn->packet, conn->socket);
 378         packet_set_callback(kdcconn->packet, kdc_tcp_recv);
 379         packet_set_full_request(kdcconn->packet, packet_full_request_u32);
 380         packet_set_error_handler(kdcconn->packet, kdc_tcp_recv_error);
 381         packet_set_event_context(kdcconn->packet, conn->event.ctx);
 382         packet_set_fde(kdcconn->packet, conn->event.fde);
 383         packet_set_serialise(kdcconn->packet);
 384 }
 385
 386 static void kdc_tcp_accept(struct stream_connection *conn)
 387 {
 388         kdc_tcp_generic_accept(conn, kdc_process);
 389 }
 390
 391 static const struct stream_server_ops kdc_tcp_stream_ops = {
 392         .name                   = "kdc_tcp",
 393         .accept_connection      = kdc_tcp_accept,
 394         .recv_handler           = kdc_tcp_recv_handler,
 395         .send_handler           = kdc_tcp_send
 396 };
 397
 398 static void kpasswdd_tcp_accept(struct stream_connection *conn)
 399 {
 400         kdc_tcp_generic_accept(conn, kpasswdd_process);
 401 }
 402
 403 static const struct stream_server_ops kpasswdd_tcp_stream_ops = {
 404         .name                   = "kpasswdd_tcp",
 405         .accept_connection      = kpasswdd_tcp_accept,
 406         .recv_handler           = kdc_tcp_recv_handler,
 407         .send_handler           = kdc_tcp_send
 408 };
 409
 410 /*
 411   start listening on the given address
 412 */
 413 static NTSTATUS kdc_add_socket(struct kdc_server *kdc, const char *address,
 414                                uint16_t kdc_port, uint16_t kpasswd_port)
 415 {
 416         const struct model_ops *model_ops;
 417         struct kdc_socket *kdc_socket;
 418         struct kdc_socket *kpasswd_socket;
 419         struct socket_address *kdc_address, *kpasswd_address;
 420         NTSTATUS status;
 421
 422         kdc_socket = talloc(kdc, struct kdc_socket);
 423         NT_STATUS_HAVE_NO_MEMORY(kdc_socket);
 424
 425         kpasswd_socket = talloc(kdc, struct kdc_socket);
 426         NT_STATUS_HAVE_NO_MEMORY(kpasswd_socket);
 427
 428         status = socket_create("ip", SOCKET_TYPE_DGRAM, &kdc_socket->sock, 0);
 429         if (!NT_STATUS_IS_OK(status)) {
 430                 talloc_free(kdc_socket);
 431                 return status;
 432         }
 433
 434         status = socket_create("ip", SOCKET_TYPE_DGRAM, &kpasswd_socket->sock, 0);
 435         if (!NT_STATUS_IS_OK(status)) {
 436                 talloc_free(kpasswd_socket);
 437                 return status;
 438         }
 439
 440         kdc_socket->kdc = kdc;
 441         kdc_socket->send_queue = NULL;
 442         kdc_socket->process = kdc_process;
 443
 444         talloc_steal(kdc_socket, kdc_socket->sock);
 445
 446         kdc_socket->fde = event_add_fd(kdc->task->event_ctx, kdc,
 447                                        socket_get_fd(kdc_socket->sock), EVENT_FD_READ,
 448                                        kdc_socket_handler, kdc_socket);
 449
 450         kdc_address = socket_address_from_strings(kdc_socket, kdc_socket->sock->backend_name,
 451                                                   address, kdc_port);
 452         NT_STATUS_HAVE_NO_MEMORY(kdc_address);
 453
 454         status = socket_listen(kdc_socket->sock, kdc_address, 0, 0);
 455         if (!NT_STATUS_IS_OK(status)) {
 456                 DEBUG(0,("Failed to bind to %s:%d UDP for kdc - %s\n",
 457                          address, kdc_port, nt_errstr(status)));
 458                 talloc_free(kdc_socket);
 459                 return status;
 460         }
 461
 462         kpasswd_socket->kdc = kdc;
 463         kpasswd_socket->send_queue = NULL;
 464         kpasswd_socket->process = kpasswdd_process;
 465
 466         talloc_steal(kpasswd_socket, kpasswd_socket->sock);
 467
 468         kpasswd_socket->fde = event_add_fd(kdc->task->event_ctx, kdc,
 469                                            socket_get_fd(kpasswd_socket->sock), EVENT_FD_READ,
 470                                            kdc_socket_handler, kpasswd_socket);
 471
 472         kpasswd_address = socket_address_from_strings(kpasswd_socket, kpasswd_socket->sock->backend_name,
 473                                                       address, kpasswd_port);
 474         NT_STATUS_HAVE_NO_MEMORY(kpasswd_address);
 475
 476         status = socket_listen(kpasswd_socket->sock, kpasswd_address, 0, 0);
 477         if (!NT_STATUS_IS_OK(status)) {
 478                 DEBUG(0,("Failed to bind to %s:%d UDP for kpasswd - %s\n",
 479                          address, kpasswd_port, nt_errstr(status)));
 480                 talloc_free(kpasswd_socket);
 481                 return status;
 482         }
 483
 484         /* within the kdc task we want to be a single process, so
 485            ask for the single process model ops and pass these to the
 486            stream_setup_socket() call. */
 487         model_ops = process_model_byname("single");
 488         if (!model_ops) {
 489                 DEBUG(0,("Can't find 'single' process model_ops\n"));
 490                 talloc_free(kdc_socket);
 491                 return NT_STATUS_INTERNAL_ERROR;
 492         }
 493
 494         status = stream_setup_socket(kdc->task->event_ctx,
 495                                      kdc->task->lp_ctx,
 496                                      model_ops,
 497                                      &kdc_tcp_stream_ops,
 498                                      "ip", address, &kdc_port,
 499                                      lp_socket_options(kdc->task->lp_ctx),
 500                                      kdc);
 501         if (!NT_STATUS_IS_OK(status)) {
 502                 DEBUG(0,("Failed to bind to %s:%u TCP - %s\n",
 503                          address, kdc_port, nt_errstr(status)));
 504                 talloc_free(kdc_socket);
 505                 return status;
 506         }
 507
 508         status = stream_setup_socket(kdc->task->event_ctx,
 509                                      kdc->task->lp_ctx,
 510                                      model_ops,
 511                                      &kpasswdd_tcp_stream_ops,
 512                                      "ip", address, &kpasswd_port,
 513                                      lp_socket_options(kdc->task->lp_ctx),
 514                                      kdc);
 515         if (!NT_STATUS_IS_OK(status)) {
 516                 DEBUG(0,("Failed to bind to %s:%u TCP - %s\n",
 517                          address, kpasswd_port, nt_errstr(status)));
 518                 talloc_free(kdc_socket);
 519                 return status;
 520         }
 521
 522         return NT_STATUS_OK;
 523 }
 524
 525
 526 /*
 527   setup our listening sockets on the configured network interfaces
 528 */
 529 static NTSTATUS kdc_startup_interfaces(struct kdc_server *kdc, struct loadparm_context *lp_ctx,
 530                                        struct interface *ifaces)
 531 {
 532         int num_interfaces;
 533         TALLOC_CTX *tmp_ctx = talloc_new(kdc);
 534         NTSTATUS status;
 535         int i;
 536
 537         num_interfaces = iface_count(ifaces);
 538
 539         for (i=0; i<num_interfaces; i++) {
 540                 const char *address = talloc_strdup(tmp_ctx, iface_n_ip(ifaces, i));
 541                 status = kdc_add_socket(kdc, address, lp_krb5_port(lp_ctx),
 542                                         lp_kpasswd_port(lp_ctx));
 543                 NT_STATUS_NOT_OK_RETURN(status);
 544         }
 545
 546         talloc_free(tmp_ctx);
 547
 548         return NT_STATUS_OK;
 549 }
 550
 551 static struct krb5plugin_windc_ftable windc_plugin_table = {
 552         .minor_version = KRB5_WINDC_PLUGING_MINOR,
 553         .init = samba_kdc_plugin_init,
 554         .fini = samba_kdc_plugin_fini,
 555         .pac_generate = samba_kdc_get_pac,
 556         .pac_verify = samba_kdc_reget_pac,
 557         .client_access = samba_kdc_check_client_access,
 558 };
 559
 560
 561 static NTSTATUS kdc_check_generic_kerberos(struct irpc_message *msg,
 562                                  struct kdc_check_generic_kerberos *r)
 563 {
 564         struct PAC_Validate pac_validate;
 565         DATA_BLOB srv_sig;
 566         struct PAC_SIGNATURE_DATA kdc_sig;
 567         struct kdc_server *kdc = talloc_get_type(msg->private, struct kdc_server);
 568         enum ndr_err_code ndr_err;
 569         krb5_enctype etype;
 570         int ret;
 571         hdb_entry_ex ent;
 572         krb5_principal principal;
 573         krb5_keyblock keyblock;
 574         Key *key;
 575
 576         /* There is no reply to this request */
 577         r->out.generic_reply = data_blob(NULL, 0);
 578
 579         ndr_err = ndr_pull_struct_blob(&r->in.generic_request, msg,
 580                                        lp_iconv_convenience(kdc->task->lp_ctx),
 581                                        &pac_validate,
 582                                        (ndr_pull_flags_fn_t)ndr_pull_PAC_Validate);
 583         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
 584                 return NT_STATUS_INVALID_PARAMETER;
 585         }
 586
 587 #if 0
 588         /* Windows does not check this */
 589         if (pac_validate.MessageType != 3) {
 590                 /* We don't implement any other message types - such as certificate validation - yet */
 591                 return NT_STATUS_INVALID_PARAMETER;
 592         }
 593 #endif
 594         if (pac_validate.ChecksumAndSignature.length != (pac_validate.ChecksumLength + pac_validate.SignatureLength)
 595             || pac_validate.ChecksumAndSignature.length < pac_validate.ChecksumLength
 596             || pac_validate.ChecksumAndSignature.length < pac_validate.SignatureLength ) {
 597                 return NT_STATUS_INVALID_PARAMETER;
 598         }
 599
 600         srv_sig = data_blob_const(pac_validate.ChecksumAndSignature.data,
 601                                   pac_validate.ChecksumLength);
 602
 603         if (pac_validate.SignatureType == CKSUMTYPE_HMAC_MD5) {
 604                 etype = ETYPE_ARCFOUR_HMAC_MD5;
 605         } else {
 606                 ret = krb5_cksumtype_to_enctype(kdc->smb_krb5_context->krb5_context, pac_validate.SignatureType,
 607                                                 &etype);
 608                 if (ret != 0) {
 609                         return NT_STATUS_LOGON_FAILURE;
 610                 }
 611         }
 612
 613         ret = krb5_make_principal(kdc->smb_krb5_context->krb5_context, &principal,
 614                                   lp_realm(kdc->task->lp_ctx),
 615                                   "krbtgt", lp_realm(kdc->task->lp_ctx),
 616                                   NULL);
 617
 618         if (ret != 0) {
 619                 return NT_STATUS_NO_MEMORY;
 620         }
 621
 622         ret = kdc->config->db[0]->hdb_fetch(kdc->smb_krb5_context->krb5_context,
 623                                             kdc->config->db[0],
 624                                             principal,
 625                                             HDB_F_GET_KRBTGT | HDB_F_DECRYPT,
 626                                             &ent);
 627
 628         if (ret != 0) {
 629                 hdb_free_entry(kdc->smb_krb5_context->krb5_context, &ent);
 630                 krb5_free_principal(kdc->smb_krb5_context->krb5_context, principal);
 631
 632                 return NT_STATUS_LOGON_FAILURE;
 633         }
 634
 635         ret = hdb_enctype2key(kdc->smb_krb5_context->krb5_context, &ent.entry, etype, &key);
 636
 637         if (ret != 0) {
 638                 hdb_free_entry(kdc->smb_krb5_context->krb5_context, &ent);
 639                 krb5_free_principal(kdc->smb_krb5_context->krb5_context, principal);
 640                 return NT_STATUS_LOGON_FAILURE;
 641         }
 642
 643         keyblock = key->key;
 644
 645         kdc_sig.type = pac_validate.SignatureType;
 646         kdc_sig.signature = data_blob_const(&pac_validate.ChecksumAndSignature.data[pac_validate.ChecksumLength],
 647                                             pac_validate.SignatureLength);
 648         ret = check_pac_checksum(msg, srv_sig, &kdc_sig,
 649                            kdc->smb_krb5_context->krb5_context, &keyblock);
 650
 651         hdb_free_entry(kdc->smb_krb5_context->krb5_context, &ent);
 652         krb5_free_principal(kdc->smb_krb5_context->krb5_context, principal);
 653
 654         if (ret != 0) {
 655                 return NT_STATUS_LOGON_FAILURE;
 656         }
 657
 658         return NT_STATUS_OK;
 659 }
 660
 661
 662
 663 /*
 664   startup the kdc task
 665 */
 666 static void kdc_task_init(struct task_server *task)
 667 {
 668         struct kdc_server *kdc;
 669         NTSTATUS status;
 670         krb5_error_code ret;
 671         struct interface *ifaces;
 672
 673         switch (lp_server_role(task->lp_ctx)) {
 674         case ROLE_STANDALONE:
 675                 task_server_terminate(task, "kdc: no KDC required in standalone configuration");
 676                 return;
 677         case ROLE_DOMAIN_MEMBER:
 678                 task_server_terminate(task, "kdc: no KDC required in member server configuration");
 679                 return;
 680         case ROLE_DOMAIN_CONTROLLER:
 681                 /* Yes, we want a KDC */
 682                 break;
 683         }
 684
 685         load_interfaces(task, lp_interfaces(task->lp_ctx), &ifaces);
 686
 687         if (iface_count(ifaces) == 0) {
 688                 task_server_terminate(task, "kdc: no network interfaces configured");
 689                 return;
 690         }
 691
 692         task_server_set_title(task, "task[kdc]");
 693
 694         kdc = talloc(task, struct kdc_server);
 695         if (kdc == NULL) {
 696                 task_server_terminate(task, "kdc: out of memory");
 697                 return;
 698         }
 699
 700         kdc->task = task;
 701
 702         initialize_krb5_error_table();
 703
 704         ret = smb_krb5_init_context(kdc, task->event_ctx, task->lp_ctx, &kdc->smb_krb5_context);
 705         if (ret) {
 706                 DEBUG(1,("kdc_task_init: krb5_init_context failed (%s)\n",
 707                          error_message(ret)));
 708                 task_server_terminate(task, "kdc: krb5_init_context failed");
 709                 return;
 710         }
 711
 712         krb5_add_et_list(kdc->smb_krb5_context->krb5_context, initialize_hdb_error_table_r);
 713
 714         ret = krb5_kdc_get_config(kdc->smb_krb5_context->krb5_context,
 715                                   &kdc->config);
 716         if(ret) {
 717                 task_server_terminate(task, "kdc: failed to get KDC configuration");
 718                 return;
 719         }
 720
 721         kdc->config->logf = kdc->smb_krb5_context->logf;
 722         kdc->config->db = talloc(kdc, struct HDB *);
 723         if (!kdc->config->db) {
 724                 task_server_terminate(task, "kdc: out of memory");
 725                 return;
 726         }
 727         kdc->config->num_db = 1;
 728
 729         status = kdc_hdb_ldb_create(kdc, task->event_ctx, task->lp_ctx,
 730                                     kdc->smb_krb5_context->krb5_context,
 731                                     &kdc->config->db[0], NULL);
 732         if (!NT_STATUS_IS_OK(status)) {
 733                 task_server_terminate(task, "kdc: hdb_ldb_create (setup KDC database) failed");
 734                 return;
 735         }
 736
 737         ret = krb5_kt_register(kdc->smb_krb5_context->krb5_context, &hdb_kt_ops);
 738         if(ret) {
 739                 task_server_terminate(task, "kdc: failed to register hdb keytab");
 740                 return;
 741         }
 742
 743         /* Registar WinDC hooks */
 744         ret = krb5_plugin_register(kdc->smb_krb5_context->krb5_context,
 745                                    PLUGIN_TYPE_DATA, "windc",
 746                                    &windc_plugin_table);
 747         if(ret) {
 748                 task_server_terminate(task, "kdc: failed to register hdb keytab");
 749                 return;
 750         }
 751
 752         krb5_kdc_windc_init(kdc->smb_krb5_context->krb5_context);
 753
 754         kdc_mem_ctx = kdc->smb_krb5_context;
 755         kdc_lp_ctx = task->lp_ctx;
 756
 757         /* start listening on the configured network interfaces */
 758         status = kdc_startup_interfaces(kdc, task->lp_ctx, ifaces);
 759         if (!NT_STATUS_IS_OK(status)) {
 760                 task_server_terminate(task, "kdc failed to setup interfaces");
 761                 return;
 762         }
 763
 764         status = IRPC_REGISTER(task->msg_ctx, irpc, KDC_CHECK_GENERIC_KERBEROS,
 765                                kdc_check_generic_kerberos, kdc);
 766         if (!NT_STATUS_IS_OK(status)) {
 767                 task_server_terminate(task, "nbtd failed to setup monitoring");
 768                 return;
 769         }
 770
 771         irpc_add_name(task->msg_ctx, "kdc_server");
 772 }
 773
 774
 775 /* called at smbd startup - register ourselves as a server service */
 776 NTSTATUS server_service_kdc_init(void)
 777 {
 778         return register_server_service("kdc", kdc_task_init);
 779 }