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 "lib/tsocket/tsocket.h"
  32 #include "libcli/util/tstream.h"
  33 #include "system/network.h"
  34 #include "../lib/util/dlinklist.h"
  35 #include "lib/messaging/irpc.h"
  36 #include "lib/stream/packet.h"
  37 #include "librpc/gen_ndr/samr.h"
  38 #include "librpc/gen_ndr/ndr_irpc.h"
  39 #include "librpc/gen_ndr/ndr_krb5pac.h"
  40 #include "lib/socket/netif.h"
  41 #include "param/param.h"
  42 #include "kdc/kdc.h"
  43 #include "librpc/gen_ndr/ndr_misc.h"
  44
  45
  46 /* Disgusting hack to get a mem_ctx and lp_ctx into the hdb plugin, when
  47  * used as a keytab */
  48 TALLOC_CTX *hdb_samba4_mem_ctx;
  49 struct tevent_context *hdb_samba4_ev_ctx;
  50 struct loadparm_context *hdb_samba4_lp_ctx;
  51 extern struct krb5plugin_windc_ftable windc_plugin_table;
  52 extern struct hdb_method hdb_samba4;
  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 tsocket_address *peer_addr,
  59                                  struct tsocket_address *my_addr,
  60                                  int datagram);
  61
  62 /* hold information about one kdc socket */
  63 struct kdc_socket {
  64         struct kdc_server *kdc;
  65         struct tsocket_address *local_address;
  66         kdc_process_fn_t process;
  67 };
  68
  69 /*
  70   state of an open tcp connection
  71 */
  72 struct kdc_tcp_connection {
  73         /* stream connection we belong to */
  74         struct stream_connection *conn;
  75
  76         /* the kdc_server the connection belongs to */
  77         struct kdc_socket *kdc_socket;
  78
  79         struct tstream_context *tstream;
  80
  81         struct tevent_queue *send_queue;
  82 };
  83
  84 static void kdc_tcp_terminate_connection(struct kdc_tcp_connection *kdcconn, const char *reason)
  85 {
  86         stream_terminate_connection(kdcconn->conn, reason);
  87 }
  88
  89 static void kdc_tcp_recv(struct stream_connection *conn, uint16_t flags)
  90 {
  91         struct kdc_tcp_connection *kdcconn = talloc_get_type(conn->private_data,
  92                                                              struct kdc_tcp_connection);
  93         /* this should never be triggered! */
  94         kdc_tcp_terminate_connection(kdcconn, "kdc_tcp_recv: called");
  95 }
  96
  97 static void kdc_tcp_send(struct stream_connection *conn, uint16_t flags)
  98 {
  99         struct kdc_tcp_connection *kdcconn = talloc_get_type(conn->private_data,
 100                                                              struct kdc_tcp_connection);
 101         /* this should never be triggered! */
 102         kdc_tcp_terminate_connection(kdcconn, "kdc_tcp_send: called");
 103 }
 104
 105 /**
 106    Wrapper for krb5_kdc_process_krb5_request, converting to/from Samba
 107    calling conventions
 108 */
 109
 110 static bool kdc_process(struct kdc_server *kdc,
 111                         TALLOC_CTX *mem_ctx,
 112                         DATA_BLOB *input,
 113                         DATA_BLOB *reply,
 114                         struct tsocket_address *peer_addr,
 115                         struct tsocket_address *my_addr,
 116                         int datagram_reply)
 117 {
 118         int ret;
 119         char *pa;
 120         struct sockaddr_storage ss;
 121         krb5_data k5_reply;
 122         krb5_data_zero(&k5_reply);
 123
 124         krb5_kdc_update_time(NULL);
 125
 126         ret = tsocket_address_bsd_sockaddr(peer_addr, (struct sockaddr *) &ss,
 127                                 sizeof(struct sockaddr_storage));
 128         if (ret < 0) {
 129                 return false;
 130         }
 131         pa = tsocket_address_string(peer_addr, mem_ctx);
 132         if (pa == NULL) {
 133                 return false;
 134         }
 135
 136         DEBUG(10,("Received KDC packet of length %lu from %s\n",
 137                                 (long)input->length - 4, pa));
 138
 139         ret = krb5_kdc_process_krb5_request(kdc->smb_krb5_context->krb5_context,
 140                                             kdc->config,
 141                                             input->data, input->length,
 142                                             &k5_reply,
 143                                             pa,
 144                                             (struct sockaddr *) &ss,
 145                                             datagram_reply);
 146         if (ret == -1) {
 147                 *reply = data_blob(NULL, 0);
 148                 return false;
 149         }
 150         if (k5_reply.length) {
 151                 *reply = data_blob_talloc(mem_ctx, k5_reply.data, k5_reply.length);
 152                 krb5_data_free(&k5_reply);
 153         } else {
 154                 *reply = data_blob(NULL, 0);
 155         }
 156         return true;
 157 }
 158
 159 struct kdc_tcp_call {
 160         struct kdc_tcp_connection *kdc_conn;
 161         DATA_BLOB in;
 162         DATA_BLOB out;
 163         uint8_t out_hdr[4];
 164         struct iovec out_iov[2];
 165 };
 166
 167 static void kdc_tcp_call_writev_done(struct tevent_req *subreq);
 168
 169 static void kdc_tcp_call_loop(struct tevent_req *subreq)
 170 {
 171         struct kdc_tcp_connection *kdc_conn = tevent_req_callback_data(subreq,
 172                                       struct kdc_tcp_connection);
 173         struct kdc_tcp_call *call;
 174         NTSTATUS status;
 175         bool ok;
 176
 177         call = talloc(kdc_conn, struct kdc_tcp_call);
 178         if (call == NULL) {
 179                 kdc_tcp_terminate_connection(kdc_conn, "kdc_tcp_call_loop: "
 180                                 "no memory for kdc_tcp_call");
 181                 return;
 182         }
 183         call->kdc_conn = kdc_conn;
 184
 185         status = tstream_read_pdu_blob_recv(subreq,
 186                                             call,
 187                                             &call->in);
 188         TALLOC_FREE(subreq);
 189         if (!NT_STATUS_IS_OK(status)) {
 190                 const char *reason;
 191
 192                 reason = talloc_asprintf(call, "kdc_tcp_call_loop: "
 193                                          "tstream_read_pdu_blob_recv() - %s",
 194                                          nt_errstr(status));
 195                 if (!reason) {
 196                         reason = nt_errstr(status);
 197                 }
 198
 199                 kdc_tcp_terminate_connection(kdc_conn, reason);
 200                 return;
 201         }
 202
 203         DEBUG(10,("Received krb5 TCP packet of length %lu from %s\n",
 204                  (long) call->in.length,
 205                  tsocket_address_string(kdc_conn->conn->remote_address, call)));
 206
 207         /* skip length header */
 208         call->in.data +=4;
 209         call->in.length -= 4;
 210
 211         /* Call krb5 */
 212         ok = kdc_conn->kdc_socket->process(kdc_conn->kdc_socket->kdc,
 213                                            call,
 214                                            &call->in,
 215                                            &call->out,
 216                                            kdc_conn->conn->remote_address,
 217                                            kdc_conn->conn->local_address,
 218                                            0 /* Stream */);
 219         if (!ok) {
 220                 kdc_tcp_terminate_connection(kdc_conn,
 221                                 "kdc_tcp_call_loop: process function failed");
 222                 return;
 223         }
 224
 225         /* First add the length of the out buffer */
 226         RSIVAL(call->out_hdr, 0, call->out.length);
 227         call->out_iov[0].iov_base = call->out_hdr;
 228         call->out_iov[0].iov_len = 4;
 229
 230         call->out_iov[1].iov_base = call->out.data;
 231         call->out_iov[1].iov_len = call->out.length;
 232
 233         subreq = tstream_writev_queue_send(call,
 234                                            kdc_conn->conn->event.ctx,
 235                                            kdc_conn->tstream,
 236                                            kdc_conn->send_queue,
 237                                            call->out_iov, 2);
 238         if (subreq == NULL) {
 239                 kdc_tcp_terminate_connection(kdc_conn, "kdc_tcp_call_loop: "
 240                                 "no memory for tstream_writev_queue_send");
 241                 return;
 242         }
 243         tevent_req_set_callback(subreq, kdc_tcp_call_writev_done, call);
 244
 245         /*
 246          * The krb5 tcp pdu's has the length as 4 byte (initial_read_size),
 247          * packet_full_request_u32 provides the pdu length then.
 248          */
 249         subreq = tstream_read_pdu_blob_send(kdc_conn,
 250                                             kdc_conn->conn->event.ctx,
 251                                             kdc_conn->tstream,
 252                                             4, /* initial_read_size */
 253                                             packet_full_request_u32,
 254                                             kdc_conn);
 255         if (subreq == NULL) {
 256                 kdc_tcp_terminate_connection(kdc_conn, "kdc_tcp_call_loop: "
 257                                 "no memory for tstream_read_pdu_blob_send");
 258                 return;
 259         }
 260         tevent_req_set_callback(subreq, kdc_tcp_call_loop, kdc_conn);
 261 }
 262
 263 static void kdc_tcp_call_writev_done(struct tevent_req *subreq)
 264 {
 265         struct kdc_tcp_call *call = tevent_req_callback_data(subreq,
 266                         struct kdc_tcp_call);
 267         int sys_errno;
 268         int rc;
 269
 270         rc = tstream_writev_queue_recv(subreq, &sys_errno);
 271         TALLOC_FREE(subreq);
 272         if (rc == -1) {
 273                 const char *reason;
 274
 275                 reason = talloc_asprintf(call, "kdc_tcp_call_writev_done: "
 276                                          "tstream_writev_queue_recv() - %d:%s",
 277                                          sys_errno, strerror(sys_errno));
 278                 if (!reason) {
 279                         reason = "kdc_tcp_call_writev_done: tstream_writev_queue_recv() failed";
 280                 }
 281
 282                 kdc_tcp_terminate_connection(call->kdc_conn, reason);
 283                 return;
 284         }
 285
 286         /* We don't care about errors */
 287
 288         talloc_free(call);
 289 }
 290
 291 /*
 292   called when we get a new connection
 293 */
 294 static void kdc_tcp_accept(struct stream_connection *conn)
 295 {
 296         struct kdc_socket *kdc_socket;
 297         struct kdc_tcp_connection *kdc_conn;
 298         struct tevent_req *subreq;
 299         int rc;
 300
 301         kdc_conn = talloc_zero(conn, struct kdc_tcp_connection);
 302         if (kdc_conn == NULL) {
 303                 stream_terminate_connection(conn,
 304                                 "kdc_tcp_accept: out of memory");
 305                 return;
 306         }
 307
 308         kdc_conn->send_queue = tevent_queue_create(conn, "kdc_tcp_accept");
 309         if (kdc_conn->send_queue == NULL) {
 310                 stream_terminate_connection(conn,
 311                                 "kdc_tcp_accept: out of memory");
 312                 return;
 313         }
 314
 315         kdc_socket = talloc_get_type(conn->private_data, struct kdc_socket);
 316
 317         TALLOC_FREE(conn->event.fde);
 318
 319         rc = tstream_bsd_existing_socket(kdc_conn->tstream,
 320                         socket_get_fd(conn->socket),
 321                         &kdc_conn->tstream);
 322         if (rc < 0) {
 323                 stream_terminate_connection(conn,
 324                                 "kdc_tcp_accept: out of memory");
 325                 return;
 326         }
 327
 328         kdc_conn->conn = conn;
 329         kdc_conn->kdc_socket = kdc_socket;
 330         conn->private_data = kdc_conn;
 331
 332         /*
 333          * The krb5 tcp pdu's has the length as 4 byte (initial_read_size),
 334          * packet_full_request_u32 provides the pdu length then.
 335          */
 336         subreq = tstream_read_pdu_blob_send(kdc_conn,
 337                                             kdc_conn->conn->event.ctx,
 338                                             kdc_conn->tstream,
 339                                             4, /* initial_read_size */
 340                                             packet_full_request_u32,
 341                                             kdc_conn);
 342         if (subreq == NULL) {
 343                 kdc_tcp_terminate_connection(kdc_conn, "kdc_tcp_accept: "
 344                                 "no memory for tstream_read_pdu_blob_send");
 345                 return;
 346         }
 347         tevent_req_set_callback(subreq, kdc_tcp_call_loop, kdc_conn);
 348 }
 349
 350 static const struct stream_server_ops kdc_tcp_stream_ops = {
 351         .name                   = "kdc_tcp",
 352         .accept_connection      = kdc_tcp_accept,
 353         .recv_handler           = kdc_tcp_recv,
 354         .send_handler           = kdc_tcp_send
 355 };
 356
 357 /* hold information about one kdc/kpasswd udp socket */
 358 struct kdc_udp_socket {
 359         struct kdc_socket *kdc_socket;
 360         struct tdgram_context *dgram;
 361         struct tevent_queue *send_queue;
 362 };
 363
 364 struct kdc_udp_call {
 365         struct tsocket_address *src;
 366         DATA_BLOB in;
 367         DATA_BLOB out;
 368 };
 369
 370 static void kdc_udp_call_sendto_done(struct tevent_req *subreq);
 371
 372 static void kdc_udp_call_loop(struct tevent_req *subreq)
 373 {
 374         struct kdc_udp_socket *sock = tevent_req_callback_data(subreq,
 375                                       struct kdc_udp_socket);
 376         struct kdc_udp_call *call;
 377         uint8_t *buf;
 378         ssize_t len;
 379         int sys_errno;
 380         bool ok;
 381
 382         call = talloc(sock, struct kdc_udp_call);
 383         if (call == NULL) {
 384                 talloc_free(call);
 385                 goto done;
 386         }
 387
 388         len = tdgram_recvfrom_recv(subreq, &sys_errno,
 389                                    call, &buf, &call->src);
 390         TALLOC_FREE(subreq);
 391         if (len == -1) {
 392                 talloc_free(call);
 393                 goto done;
 394         }
 395
 396         call->in.data = buf;
 397         call->in.length = len;
 398
 399         DEBUG(10,("Received krb5 UDP packet of length %lu from %s\n",
 400                  (long)call->in.length,
 401                  tsocket_address_string(call->src, call)));
 402
 403         /* Call krb5 */
 404         ok = sock->kdc_socket->process(sock->kdc_socket->kdc,
 405                                        call,
 406                                        &call->in,
 407                                        &call->out,
 408                                        call->src,
 409                                        sock->kdc_socket->local_address,
 410                                        1 /* Datagram */);
 411         if (!ok) {
 412                 talloc_free(call);
 413                 goto done;
 414         }
 415
 416         subreq = tdgram_sendto_queue_send(call,
 417                                           sock->kdc_socket->kdc->task->event_ctx,
 418                                           sock->dgram,
 419                                           sock->send_queue,
 420                                           call->out.data,
 421                                           call->out.length,
 422                                           call->src);
 423         if (subreq == NULL) {
 424                 talloc_free(call);
 425                 goto done;
 426         }
 427         tevent_req_set_callback(subreq, kdc_udp_call_sendto_done, call);
 428
 429 done:
 430         subreq = tdgram_recvfrom_send(sock,
 431                                       sock->kdc_socket->kdc->task->event_ctx,
 432                                       sock->dgram);
 433         if (subreq == NULL) {
 434                 task_server_terminate(sock->kdc_socket->kdc->task,
 435                                       "no memory for tdgram_recvfrom_send",
 436                                       true);
 437                 return;
 438         }
 439         tevent_req_set_callback(subreq, kdc_udp_call_loop, sock);
 440 }
 441
 442 static void kdc_udp_call_sendto_done(struct tevent_req *subreq)
 443 {
 444         struct kdc_udp_call *call = tevent_req_callback_data(subreq,
 445                                        struct kdc_udp_call);
 446         ssize_t ret;
 447         int sys_errno;
 448
 449         ret = tdgram_sendto_queue_recv(subreq, &sys_errno);
 450
 451         /* We don't care about errors */
 452
 453         talloc_free(call);
 454 }
 455
 456 /*
 457   start listening on the given address
 458 */
 459 static NTSTATUS kdc_add_socket(struct kdc_server *kdc,
 460                                const struct model_ops *model_ops,
 461                                const char *name,
 462                                const char *address,
 463                                uint16_t port,
 464                                kdc_process_fn_t process)
 465 {
 466         struct kdc_socket *kdc_socket;
 467         struct kdc_udp_socket *kdc_udp_socket;
 468         struct tevent_req *udpsubreq;
 469         NTSTATUS status;
 470         int ret;
 471
 472         kdc_socket = talloc(kdc, struct kdc_socket);
 473         NT_STATUS_HAVE_NO_MEMORY(kdc_socket);
 474
 475         kdc_socket->kdc = kdc;
 476         kdc_socket->process = process;
 477
 478         ret = tsocket_address_inet_from_strings(kdc_socket, "ip",
 479                                                 address, port,
 480                                                 &kdc_socket->local_address);
 481         if (ret != 0) {
 482                 status = map_nt_error_from_unix(errno);
 483                 return status;
 484         }
 485
 486         status = stream_setup_socket(kdc->task->event_ctx,
 487                                      kdc->task->lp_ctx,
 488                                      model_ops,
 489                                      &kdc_tcp_stream_ops,
 490                                      "ip", address, &port,
 491                                      lp_socket_options(kdc->task->lp_ctx),
 492                                      kdc_socket);
 493         if (!NT_STATUS_IS_OK(status)) {
 494                 DEBUG(0,("Failed to bind to %s:%u TCP - %s\n",
 495                          address, port, nt_errstr(status)));
 496                 talloc_free(kdc_socket);
 497                 return status;
 498         }
 499
 500         kdc_udp_socket = talloc(kdc_socket, struct kdc_udp_socket);
 501         NT_STATUS_HAVE_NO_MEMORY(kdc_udp_socket);
 502
 503         kdc_udp_socket->kdc_socket = kdc_socket;
 504
 505         ret = tdgram_inet_udp_socket(kdc_socket->local_address,
 506                                      NULL,
 507                                      kdc_udp_socket,
 508                                      &kdc_udp_socket->dgram);
 509         if (ret != 0) {
 510                 status = map_nt_error_from_unix(errno);
 511                 DEBUG(0,("Failed to bind to %s:%u UDP - %s\n",
 512                          address, port, nt_errstr(status)));
 513                 return status;
 514         }
 515
 516         kdc_udp_socket->send_queue = tevent_queue_create(kdc_udp_socket,
 517                                                          "kdc_udp_send_queue");
 518         NT_STATUS_HAVE_NO_MEMORY(kdc_udp_socket->send_queue);
 519
 520         udpsubreq = tdgram_recvfrom_send(kdc_udp_socket,
 521                                          kdc->task->event_ctx,
 522                                          kdc_udp_socket->dgram);
 523         NT_STATUS_HAVE_NO_MEMORY(udpsubreq);
 524         tevent_req_set_callback(udpsubreq, kdc_udp_call_loop, kdc_udp_socket);
 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_socket(kdc, model_ops,
 560                                         "kdc", address, kdc_port,
 561                                         kdc_process);
 562                         NT_STATUS_NOT_OK_RETURN(status);
 563                 }
 564
 565                 if (kpasswd_port) {
 566                         status = kdc_add_socket(kdc, model_ops,
 567                                         "kpasswd", address, kpasswd_port,
 568                                         kpasswdd_process);
 569                         NT_STATUS_NOT_OK_RETURN(status);
 570                 }
 571         }
 572
 573         talloc_free(tmp_ctx);
 574
 575         return NT_STATUS_OK;
 576 }
 577
 578
 579 static NTSTATUS kdc_check_generic_kerberos(struct irpc_message *msg,
 580                                  struct kdc_check_generic_kerberos *r)
 581 {
 582         struct PAC_Validate pac_validate;
 583         DATA_BLOB srv_sig;
 584         struct PAC_SIGNATURE_DATA kdc_sig;
 585         struct kdc_server *kdc = talloc_get_type(msg->private_data, struct kdc_server);
 586         enum ndr_err_code ndr_err;
 587         krb5_enctype etype;
 588         int ret;
 589         hdb_entry_ex ent;
 590         krb5_principal principal;
 591         krb5_keyblock keyblock;
 592         Key *key;
 593
 594         /* There is no reply to this request */
 595         r->out.generic_reply = data_blob(NULL, 0);
 596
 597         ndr_err = ndr_pull_struct_blob(&r->in.generic_request, msg,
 598                                        lp_iconv_convenience(kdc->task->lp_ctx),
 599                                        &pac_validate,
 600                                        (ndr_pull_flags_fn_t)ndr_pull_PAC_Validate);
 601         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
 602                 return NT_STATUS_INVALID_PARAMETER;
 603         }
 604
 605         if (pac_validate.MessageType != 3) {
 606                 /* We don't implement any other message types - such as certificate validation - yet */
 607                 return NT_STATUS_INVALID_PARAMETER;
 608         }
 609
 610         if (pac_validate.ChecksumAndSignature.length != (pac_validate.ChecksumLength + pac_validate.SignatureLength)
 611             || pac_validate.ChecksumAndSignature.length < pac_validate.ChecksumLength
 612             || pac_validate.ChecksumAndSignature.length < pac_validate.SignatureLength ) {
 613                 return NT_STATUS_INVALID_PARAMETER;
 614         }
 615
 616         srv_sig = data_blob_const(pac_validate.ChecksumAndSignature.data,
 617                                   pac_validate.ChecksumLength);
 618
 619         if (pac_validate.SignatureType == CKSUMTYPE_HMAC_MD5) {
 620                 etype = ETYPE_ARCFOUR_HMAC_MD5;
 621         } else {
 622                 ret = krb5_cksumtype_to_enctype(kdc->smb_krb5_context->krb5_context, pac_validate.SignatureType,
 623                                                 &etype);
 624                 if (ret != 0) {
 625                         return NT_STATUS_LOGON_FAILURE;
 626                 }
 627         }
 628
 629         ret = krb5_make_principal(kdc->smb_krb5_context->krb5_context, &principal,
 630                                   lp_realm(kdc->task->lp_ctx),
 631                                   "krbtgt", lp_realm(kdc->task->lp_ctx),
 632                                   NULL);
 633
 634         if (ret != 0) {
 635                 return NT_STATUS_NO_MEMORY;
 636         }
 637
 638         ret = kdc->config->db[0]->hdb_fetch(kdc->smb_krb5_context->krb5_context,
 639                                             kdc->config->db[0],
 640                                             principal,
 641                                             HDB_F_GET_KRBTGT | HDB_F_DECRYPT,
 642                                             &ent);
 643
 644         if (ret != 0) {
 645                 hdb_free_entry(kdc->smb_krb5_context->krb5_context, &ent);
 646                 krb5_free_principal(kdc->smb_krb5_context->krb5_context, principal);
 647
 648                 return NT_STATUS_LOGON_FAILURE;
 649         }
 650
 651         ret = hdb_enctype2key(kdc->smb_krb5_context->krb5_context, &ent.entry, etype, &key);
 652
 653         if (ret != 0) {
 654                 hdb_free_entry(kdc->smb_krb5_context->krb5_context, &ent);
 655                 krb5_free_principal(kdc->smb_krb5_context->krb5_context, principal);
 656                 return NT_STATUS_LOGON_FAILURE;
 657         }
 658
 659         keyblock = key->key;
 660
 661         kdc_sig.type = pac_validate.SignatureType;
 662         kdc_sig.signature = data_blob_const(&pac_validate.ChecksumAndSignature.data[pac_validate.ChecksumLength],
 663                                             pac_validate.SignatureLength);
 664         ret = check_pac_checksum(msg, srv_sig, &kdc_sig,
 665                            kdc->smb_krb5_context->krb5_context, &keyblock);
 666
 667         hdb_free_entry(kdc->smb_krb5_context->krb5_context, &ent);
 668         krb5_free_principal(kdc->smb_krb5_context->krb5_context, principal);
 669
 670         if (ret != 0) {
 671                 return NT_STATUS_LOGON_FAILURE;
 672         }
 673
 674         return NT_STATUS_OK;
 675 }
 676
 677
 678 /*
 679   startup the kdc task
 680 */
 681 static void kdc_task_init(struct task_server *task)
 682 {
 683         struct kdc_server *kdc;
 684         NTSTATUS status;
 685         krb5_error_code ret;
 686         struct interface *ifaces;
 687
 688         switch (lp_server_role(task->lp_ctx)) {
 689         case ROLE_STANDALONE:
 690                 task_server_terminate(task, "kdc: no KDC required in standalone configuration", false);
 691                 return;
 692         case ROLE_DOMAIN_MEMBER:
 693                 task_server_terminate(task, "kdc: no KDC required in member server configuration", false);
 694                 return;
 695         case ROLE_DOMAIN_CONTROLLER:
 696                 /* Yes, we want a KDC */
 697                 break;
 698         }
 699
 700         load_interfaces(task, lp_interfaces(task->lp_ctx), &ifaces);
 701
 702         if (iface_count(ifaces) == 0) {
 703                 task_server_terminate(task, "kdc: no network interfaces configured", false);
 704                 return;
 705         }
 706
 707         task_server_set_title(task, "task[kdc]");
 708
 709         kdc = talloc(task, struct kdc_server);
 710         if (kdc == NULL) {
 711                 task_server_terminate(task, "kdc: out of memory", true);
 712                 return;
 713         }
 714
 715         kdc->task = task;
 716
 717         initialize_krb5_error_table();
 718
 719         ret = smb_krb5_init_context(kdc, task->event_ctx, task->lp_ctx, &kdc->smb_krb5_context);
 720         if (ret) {
 721                 DEBUG(1,("kdc_task_init: krb5_init_context failed (%s)\n",
 722                          error_message(ret)));
 723                 task_server_terminate(task, "kdc: krb5_init_context failed", true);
 724                 return;
 725         }
 726
 727         krb5_add_et_list(kdc->smb_krb5_context->krb5_context, initialize_hdb_error_table_r);
 728
 729         ret = krb5_kdc_get_config(kdc->smb_krb5_context->krb5_context,
 730                                   &kdc->config);
 731         if(ret) {
 732                 task_server_terminate(task, "kdc: failed to get KDC configuration", true);
 733                 return;
 734         }
 735
 736         kdc->config->logf = kdc->smb_krb5_context->logf;
 737         kdc->config->db = talloc(kdc, struct HDB *);
 738         if (!kdc->config->db) {
 739                 task_server_terminate(task, "kdc: out of memory", true);
 740                 return;
 741         }
 742         kdc->config->num_db = 1;
 743
 744         /* Register hdb-samba4 hooks for use as a keytab */
 745
 746         kdc->base_ctx = talloc_zero(kdc, struct samba_kdc_base_context);
 747         if (!kdc->base_ctx) {
 748                 task_server_terminate(task, "kdc: out of memory", true);
 749                 return;
 750         }
 751
 752         kdc->base_ctx->ev_ctx = task->event_ctx;
 753         kdc->base_ctx->lp_ctx = task->lp_ctx;
 754
 755         status = hdb_samba4_create_kdc(kdc->base_ctx,
 756                                        kdc->smb_krb5_context->krb5_context,
 757                                        &kdc->config->db[0]);
 758         if (!NT_STATUS_IS_OK(status)) {
 759                 task_server_terminate(task, "kdc: hdb_samba4_create_kdc (setup KDC database) failed", true);
 760                 return;
 761         }
 762
 763         ret = krb5_plugin_register(kdc->smb_krb5_context->krb5_context,
 764                                    PLUGIN_TYPE_DATA, "hdb",
 765                                    &hdb_samba4);
 766         if(ret) {
 767                 task_server_terminate(task, "kdc: failed to register hdb plugin", true);
 768                 return;
 769         }
 770
 771         ret = krb5_kt_register(kdc->smb_krb5_context->krb5_context, &hdb_kt_ops);
 772         if(ret) {
 773                 task_server_terminate(task, "kdc: failed to register keytab plugin", true);
 774                 return;
 775         }
 776
 777         /* Register WinDC hooks */
 778         ret = krb5_plugin_register(kdc->smb_krb5_context->krb5_context,
 779                                    PLUGIN_TYPE_DATA, "windc",
 780                                    &windc_plugin_table);
 781         if(ret) {
 782                 task_server_terminate(task, "kdc: failed to register windc plugin", true);
 783                 return;
 784         }
 785
 786         krb5_kdc_windc_init(kdc->smb_krb5_context->krb5_context);
 787
 788         /* start listening on the configured network interfaces */
 789         status = kdc_startup_interfaces(kdc, task->lp_ctx, ifaces);
 790         if (!NT_STATUS_IS_OK(status)) {
 791                 task_server_terminate(task, "kdc failed to setup interfaces", true);
 792                 return;
 793         }
 794
 795         status = IRPC_REGISTER(task->msg_ctx, irpc, KDC_CHECK_GENERIC_KERBEROS,
 796                                kdc_check_generic_kerberos, kdc);
 797         if (!NT_STATUS_IS_OK(status)) {
 798                 task_server_terminate(task, "nbtd failed to setup monitoring", true);
 799                 return;
 800         }
 801
 802         irpc_add_name(task->msg_ctx, "kdc_server");
 803 }
 804
 805
 806 /* called at smbd startup - register ourselves as a server service */
 807 NTSTATUS server_service_kdc_init(void)
 808 {
 809         return register_server_service("kdc", kdc_task_init);
 810 }