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 extern struct krb5plugin_windc_ftable windc_plugin_table;
  47 extern struct hdb_method hdb_samba4;
  48
  49 typedef bool (*kdc_process_fn_t)(struct kdc_server *kdc,
  50                                  TALLOC_CTX *mem_ctx,
  51                                  DATA_BLOB *input,
  52                                  DATA_BLOB *reply,
  53                                  struct tsocket_address *peer_addr,
  54                                  struct tsocket_address *my_addr,
  55                                  int datagram);
  56
  57 /* hold information about one kdc socket */
  58 struct kdc_socket {
  59         struct kdc_server *kdc;
  60         struct tsocket_address *local_address;
  61         kdc_process_fn_t process;
  62 };
  63
  64 /*
  65   state of an open tcp connection
  66 */
  67 struct kdc_tcp_connection {
  68         /* stream connection we belong to */
  69         struct stream_connection *conn;
  70
  71         /* the kdc_server the connection belongs to */
  72         struct kdc_socket *kdc_socket;
  73
  74         struct tstream_context *tstream;
  75
  76         struct tevent_queue *send_queue;
  77 };
  78
  79 static void kdc_tcp_terminate_connection(struct kdc_tcp_connection *kdcconn, const char *reason)
  80 {
  81         stream_terminate_connection(kdcconn->conn, reason);
  82 }
  83
  84 static void kdc_tcp_recv(struct stream_connection *conn, uint16_t flags)
  85 {
  86         struct kdc_tcp_connection *kdcconn = talloc_get_type(conn->private_data,
  87                                                              struct kdc_tcp_connection);
  88         /* this should never be triggered! */
  89         kdc_tcp_terminate_connection(kdcconn, "kdc_tcp_recv: called");
  90 }
  91
  92 static void kdc_tcp_send(struct stream_connection *conn, uint16_t flags)
  93 {
  94         struct kdc_tcp_connection *kdcconn = talloc_get_type(conn->private_data,
  95                                                              struct kdc_tcp_connection);
  96         /* this should never be triggered! */
  97         kdc_tcp_terminate_connection(kdcconn, "kdc_tcp_send: called");
  98 }
  99
 100 /**
 101    Wrapper for krb5_kdc_process_krb5_request, converting to/from Samba
 102    calling conventions
 103 */
 104
 105 static bool kdc_process(struct kdc_server *kdc,
 106                         TALLOC_CTX *mem_ctx,
 107                         DATA_BLOB *input,
 108                         DATA_BLOB *reply,
 109                         struct tsocket_address *peer_addr,
 110                         struct tsocket_address *my_addr,
 111                         int datagram_reply)
 112 {
 113         int ret;
 114         char *pa;
 115         struct sockaddr_storage ss;
 116         krb5_data k5_reply;
 117         krb5_data_zero(&k5_reply);
 118
 119         krb5_kdc_update_time(NULL);
 120
 121         ret = tsocket_address_bsd_sockaddr(peer_addr, (struct sockaddr *) &ss,
 122                                 sizeof(struct sockaddr_storage));
 123         if (ret < 0) {
 124                 return false;
 125         }
 126         pa = tsocket_address_string(peer_addr, mem_ctx);
 127         if (pa == NULL) {
 128                 return false;
 129         }
 130
 131         DEBUG(10,("Received KDC packet of length %lu from %s\n",
 132                                 (long)input->length - 4, pa));
 133
 134         ret = krb5_kdc_process_krb5_request(kdc->smb_krb5_context->krb5_context,
 135                                             kdc->config,
 136                                             input->data, input->length,
 137                                             &k5_reply,
 138                                             pa,
 139                                             (struct sockaddr *) &ss,
 140                                             datagram_reply);
 141         if (ret == -1) {
 142                 *reply = data_blob(NULL, 0);
 143                 return false;
 144         }
 145         if (k5_reply.length) {
 146                 *reply = data_blob_talloc(mem_ctx, k5_reply.data, k5_reply.length);
 147                 krb5_data_free(&k5_reply);
 148         } else {
 149                 *reply = data_blob(NULL, 0);
 150         }
 151         return true;
 152 }
 153
 154 struct kdc_tcp_call {
 155         struct kdc_tcp_connection *kdc_conn;
 156         DATA_BLOB in;
 157         DATA_BLOB out;
 158         uint8_t out_hdr[4];
 159         struct iovec out_iov[2];
 160 };
 161
 162 static void kdc_tcp_call_writev_done(struct tevent_req *subreq);
 163
 164 static void kdc_tcp_call_loop(struct tevent_req *subreq)
 165 {
 166         struct kdc_tcp_connection *kdc_conn = tevent_req_callback_data(subreq,
 167                                       struct kdc_tcp_connection);
 168         struct kdc_tcp_call *call;
 169         NTSTATUS status;
 170         bool ok;
 171
 172         call = talloc(kdc_conn, struct kdc_tcp_call);
 173         if (call == NULL) {
 174                 kdc_tcp_terminate_connection(kdc_conn, "kdc_tcp_call_loop: "
 175                                 "no memory for kdc_tcp_call");
 176                 return;
 177         }
 178         call->kdc_conn = kdc_conn;
 179
 180         status = tstream_read_pdu_blob_recv(subreq,
 181                                             call,
 182                                             &call->in);
 183         TALLOC_FREE(subreq);
 184         if (!NT_STATUS_IS_OK(status)) {
 185                 const char *reason;
 186
 187                 reason = talloc_asprintf(call, "kdc_tcp_call_loop: "
 188                                          "tstream_read_pdu_blob_recv() - %s",
 189                                          nt_errstr(status));
 190                 if (!reason) {
 191                         reason = nt_errstr(status);
 192                 }
 193
 194                 kdc_tcp_terminate_connection(kdc_conn, reason);
 195                 return;
 196         }
 197
 198         DEBUG(10,("Received krb5 TCP packet of length %lu from %s\n",
 199                  (long) call->in.length,
 200                  tsocket_address_string(kdc_conn->conn->remote_address, call)));
 201
 202         /* skip length header */
 203         call->in.data +=4;
 204         call->in.length -= 4;
 205
 206         /* Call krb5 */
 207         ok = kdc_conn->kdc_socket->process(kdc_conn->kdc_socket->kdc,
 208                                            call,
 209                                            &call->in,
 210                                            &call->out,
 211                                            kdc_conn->conn->remote_address,
 212                                            kdc_conn->conn->local_address,
 213                                            0 /* Stream */);
 214         if (!ok) {
 215                 kdc_tcp_terminate_connection(kdc_conn,
 216                                 "kdc_tcp_call_loop: process function failed");
 217                 return;
 218         }
 219
 220         /* First add the length of the out buffer */
 221         RSIVAL(call->out_hdr, 0, call->out.length);
 222         call->out_iov[0].iov_base = (char *) call->out_hdr;
 223         call->out_iov[0].iov_len = 4;
 224
 225         call->out_iov[1].iov_base = (char *) call->out.data;
 226         call->out_iov[1].iov_len = call->out.length;
 227
 228         subreq = tstream_writev_queue_send(call,
 229                                            kdc_conn->conn->event.ctx,
 230                                            kdc_conn->tstream,
 231                                            kdc_conn->send_queue,
 232                                            call->out_iov, 2);
 233         if (subreq == NULL) {
 234                 kdc_tcp_terminate_connection(kdc_conn, "kdc_tcp_call_loop: "
 235                                 "no memory for tstream_writev_queue_send");
 236                 return;
 237         }
 238         tevent_req_set_callback(subreq, kdc_tcp_call_writev_done, call);
 239
 240         /*
 241          * The krb5 tcp pdu's has the length as 4 byte (initial_read_size),
 242          * packet_full_request_u32 provides the pdu length then.
 243          */
 244         subreq = tstream_read_pdu_blob_send(kdc_conn,
 245                                             kdc_conn->conn->event.ctx,
 246                                             kdc_conn->tstream,
 247                                             4, /* initial_read_size */
 248                                             packet_full_request_u32,
 249                                             kdc_conn);
 250         if (subreq == NULL) {
 251                 kdc_tcp_terminate_connection(kdc_conn, "kdc_tcp_call_loop: "
 252                                 "no memory for tstream_read_pdu_blob_send");
 253                 return;
 254         }
 255         tevent_req_set_callback(subreq, kdc_tcp_call_loop, kdc_conn);
 256 }
 257
 258 static void kdc_tcp_call_writev_done(struct tevent_req *subreq)
 259 {
 260         struct kdc_tcp_call *call = tevent_req_callback_data(subreq,
 261                         struct kdc_tcp_call);
 262         int sys_errno;
 263         int rc;
 264
 265         rc = tstream_writev_queue_recv(subreq, &sys_errno);
 266         TALLOC_FREE(subreq);
 267         if (rc == -1) {
 268                 const char *reason;
 269
 270                 reason = talloc_asprintf(call, "kdc_tcp_call_writev_done: "
 271                                          "tstream_writev_queue_recv() - %d:%s",
 272                                          sys_errno, strerror(sys_errno));
 273                 if (!reason) {
 274                         reason = "kdc_tcp_call_writev_done: tstream_writev_queue_recv() failed";
 275                 }
 276
 277                 kdc_tcp_terminate_connection(call->kdc_conn, reason);
 278                 return;
 279         }
 280
 281         /* We don't care about errors */
 282
 283         talloc_free(call);
 284 }
 285
 286 /*
 287   called when we get a new connection
 288 */
 289 static void kdc_tcp_accept(struct stream_connection *conn)
 290 {
 291         struct kdc_socket *kdc_socket;
 292         struct kdc_tcp_connection *kdc_conn;
 293         struct tevent_req *subreq;
 294         int rc;
 295
 296         kdc_conn = talloc_zero(conn, struct kdc_tcp_connection);
 297         if (kdc_conn == NULL) {
 298                 stream_terminate_connection(conn,
 299                                 "kdc_tcp_accept: out of memory");
 300                 return;
 301         }
 302
 303         kdc_conn->send_queue = tevent_queue_create(conn, "kdc_tcp_accept");
 304         if (kdc_conn->send_queue == NULL) {
 305                 stream_terminate_connection(conn,
 306                                 "kdc_tcp_accept: out of memory");
 307                 return;
 308         }
 309
 310         kdc_socket = talloc_get_type(conn->private_data, struct kdc_socket);
 311
 312         TALLOC_FREE(conn->event.fde);
 313
 314         rc = tstream_bsd_existing_socket(kdc_conn,
 315                         socket_get_fd(conn->socket),
 316                         &kdc_conn->tstream);
 317         if (rc < 0) {
 318                 stream_terminate_connection(conn,
 319                                 "kdc_tcp_accept: out of memory");
 320                 return;
 321         }
 322
 323         kdc_conn->conn = conn;
 324         kdc_conn->kdc_socket = kdc_socket;
 325         conn->private_data = kdc_conn;
 326
 327         /*
 328          * The krb5 tcp pdu's has the length as 4 byte (initial_read_size),
 329          * packet_full_request_u32 provides the pdu length then.
 330          */
 331         subreq = tstream_read_pdu_blob_send(kdc_conn,
 332                                             kdc_conn->conn->event.ctx,
 333                                             kdc_conn->tstream,
 334                                             4, /* initial_read_size */
 335                                             packet_full_request_u32,
 336                                             kdc_conn);
 337         if (subreq == NULL) {
 338                 kdc_tcp_terminate_connection(kdc_conn, "kdc_tcp_accept: "
 339                                 "no memory for tstream_read_pdu_blob_send");
 340                 return;
 341         }
 342         tevent_req_set_callback(subreq, kdc_tcp_call_loop, kdc_conn);
 343 }
 344
 345 static const struct stream_server_ops kdc_tcp_stream_ops = {
 346         .name                   = "kdc_tcp",
 347         .accept_connection      = kdc_tcp_accept,
 348         .recv_handler           = kdc_tcp_recv,
 349         .send_handler           = kdc_tcp_send
 350 };
 351
 352 /* hold information about one kdc/kpasswd udp socket */
 353 struct kdc_udp_socket {
 354         struct kdc_socket *kdc_socket;
 355         struct tdgram_context *dgram;
 356         struct tevent_queue *send_queue;
 357 };
 358
 359 struct kdc_udp_call {
 360         struct tsocket_address *src;
 361         DATA_BLOB in;
 362         DATA_BLOB out;
 363 };
 364
 365 static void kdc_udp_call_sendto_done(struct tevent_req *subreq);
 366
 367 static void kdc_udp_call_loop(struct tevent_req *subreq)
 368 {
 369         struct kdc_udp_socket *sock = tevent_req_callback_data(subreq,
 370                                       struct kdc_udp_socket);
 371         struct kdc_udp_call *call;
 372         uint8_t *buf;
 373         ssize_t len;
 374         int sys_errno;
 375         bool ok;
 376
 377         call = talloc(sock, struct kdc_udp_call);
 378         if (call == NULL) {
 379                 talloc_free(call);
 380                 goto done;
 381         }
 382
 383         len = tdgram_recvfrom_recv(subreq, &sys_errno,
 384                                    call, &buf, &call->src);
 385         TALLOC_FREE(subreq);
 386         if (len == -1) {
 387                 talloc_free(call);
 388                 goto done;
 389         }
 390
 391         call->in.data = buf;
 392         call->in.length = len;
 393
 394         DEBUG(10,("Received krb5 UDP packet of length %lu from %s\n",
 395                  (long)call->in.length,
 396                  tsocket_address_string(call->src, call)));
 397
 398         /* Call krb5 */
 399         ok = sock->kdc_socket->process(sock->kdc_socket->kdc,
 400                                        call,
 401                                        &call->in,
 402                                        &call->out,
 403                                        call->src,
 404                                        sock->kdc_socket->local_address,
 405                                        1 /* Datagram */);
 406         if (!ok) {
 407                 talloc_free(call);
 408                 goto done;
 409         }
 410
 411         subreq = tdgram_sendto_queue_send(call,
 412                                           sock->kdc_socket->kdc->task->event_ctx,
 413                                           sock->dgram,
 414                                           sock->send_queue,
 415                                           call->out.data,
 416                                           call->out.length,
 417                                           call->src);
 418         if (subreq == NULL) {
 419                 talloc_free(call);
 420                 goto done;
 421         }
 422         tevent_req_set_callback(subreq, kdc_udp_call_sendto_done, call);
 423
 424 done:
 425         subreq = tdgram_recvfrom_send(sock,
 426                                       sock->kdc_socket->kdc->task->event_ctx,
 427                                       sock->dgram);
 428         if (subreq == NULL) {
 429                 task_server_terminate(sock->kdc_socket->kdc->task,
 430                                       "no memory for tdgram_recvfrom_send",
 431                                       true);
 432                 return;
 433         }
 434         tevent_req_set_callback(subreq, kdc_udp_call_loop, sock);
 435 }
 436
 437 static void kdc_udp_call_sendto_done(struct tevent_req *subreq)
 438 {
 439         struct kdc_udp_call *call = tevent_req_callback_data(subreq,
 440                                        struct kdc_udp_call);
 441         ssize_t ret;
 442         int sys_errno;
 443
 444         ret = tdgram_sendto_queue_recv(subreq, &sys_errno);
 445
 446         /* We don't care about errors */
 447
 448         talloc_free(call);
 449 }
 450
 451 /*
 452   start listening on the given address
 453 */
 454 static NTSTATUS kdc_add_socket(struct kdc_server *kdc,
 455                                const struct model_ops *model_ops,
 456                                const char *name,
 457                                const char *address,
 458                                uint16_t port,
 459                                kdc_process_fn_t process)
 460 {
 461         struct kdc_socket *kdc_socket;
 462         struct kdc_udp_socket *kdc_udp_socket;
 463         struct tevent_req *udpsubreq;
 464         NTSTATUS status;
 465         int ret;
 466
 467         kdc_socket = talloc(kdc, struct kdc_socket);
 468         NT_STATUS_HAVE_NO_MEMORY(kdc_socket);
 469
 470         kdc_socket->kdc = kdc;
 471         kdc_socket->process = process;
 472
 473         ret = tsocket_address_inet_from_strings(kdc_socket, "ip",
 474                                                 address, port,
 475                                                 &kdc_socket->local_address);
 476         if (ret != 0) {
 477                 status = map_nt_error_from_unix(errno);
 478                 return status;
 479         }
 480
 481         status = stream_setup_socket(kdc->task->event_ctx,
 482                                      kdc->task->lp_ctx,
 483                                      model_ops,
 484                                      &kdc_tcp_stream_ops,
 485                                      "ip", address, &port,
 486                                      lpcfg_socket_options(kdc->task->lp_ctx),
 487                                      kdc_socket);
 488         if (!NT_STATUS_IS_OK(status)) {
 489                 DEBUG(0,("Failed to bind to %s:%u TCP - %s\n",
 490                          address, port, nt_errstr(status)));
 491                 talloc_free(kdc_socket);
 492                 return status;
 493         }
 494
 495         kdc_udp_socket = talloc(kdc_socket, struct kdc_udp_socket);
 496         NT_STATUS_HAVE_NO_MEMORY(kdc_udp_socket);
 497
 498         kdc_udp_socket->kdc_socket = kdc_socket;
 499
 500         ret = tdgram_inet_udp_socket(kdc_socket->local_address,
 501                                      NULL,
 502                                      kdc_udp_socket,
 503                                      &kdc_udp_socket->dgram);
 504         if (ret != 0) {
 505                 status = map_nt_error_from_unix(errno);
 506                 DEBUG(0,("Failed to bind to %s:%u UDP - %s\n",
 507                          address, port, nt_errstr(status)));
 508                 return status;
 509         }
 510
 511         kdc_udp_socket->send_queue = tevent_queue_create(kdc_udp_socket,
 512                                                          "kdc_udp_send_queue");
 513         NT_STATUS_HAVE_NO_MEMORY(kdc_udp_socket->send_queue);
 514
 515         udpsubreq = tdgram_recvfrom_send(kdc_udp_socket,
 516                                          kdc->task->event_ctx,
 517                                          kdc_udp_socket->dgram);
 518         NT_STATUS_HAVE_NO_MEMORY(udpsubreq);
 519         tevent_req_set_callback(udpsubreq, kdc_udp_call_loop, kdc_udp_socket);
 520
 521         return NT_STATUS_OK;
 522 }
 523
 524
 525 /*
 526   setup our listening sockets on the configured network interfaces
 527 */
 528 static NTSTATUS kdc_startup_interfaces(struct kdc_server *kdc, struct loadparm_context *lp_ctx,
 529                                        struct interface *ifaces)
 530 {
 531         const struct model_ops *model_ops;
 532         int num_interfaces;
 533         TALLOC_CTX *tmp_ctx = talloc_new(kdc);
 534         NTSTATUS status;
 535         int i;
 536
 537         /* within the kdc task we want to be a single process, so
 538            ask for the single process model ops and pass these to the
 539            stream_setup_socket() call. */
 540         model_ops = process_model_startup(kdc->task->event_ctx, "single");
 541         if (!model_ops) {
 542                 DEBUG(0,("Can't find 'single' process model_ops\n"));
 543                 return NT_STATUS_INTERNAL_ERROR;
 544         }
 545
 546         num_interfaces = iface_count(ifaces);
 547
 548         for (i=0; i<num_interfaces; i++) {
 549                 const char *address = talloc_strdup(tmp_ctx, iface_n_ip(ifaces, i));
 550                 uint16_t kdc_port = lpcfg_krb5_port(lp_ctx);
 551                 uint16_t kpasswd_port = lpcfg_kpasswd_port(lp_ctx);
 552
 553                 if (kdc_port) {
 554                         status = kdc_add_socket(kdc, model_ops,
 555                                         "kdc", address, kdc_port,
 556                                         kdc_process);
 557                         NT_STATUS_NOT_OK_RETURN(status);
 558                 }
 559
 560                 if (kpasswd_port) {
 561                         status = kdc_add_socket(kdc, model_ops,
 562                                         "kpasswd", address, kpasswd_port,
 563                                         kpasswdd_process);
 564                         NT_STATUS_NOT_OK_RETURN(status);
 565                 }
 566         }
 567
 568         talloc_free(tmp_ctx);
 569
 570         return NT_STATUS_OK;
 571 }
 572
 573
 574 static NTSTATUS kdc_check_generic_kerberos(struct irpc_message *msg,
 575                                  struct kdc_check_generic_kerberos *r)
 576 {
 577         struct PAC_Validate pac_validate;
 578         DATA_BLOB srv_sig;
 579         struct PAC_SIGNATURE_DATA kdc_sig;
 580         struct kdc_server *kdc = talloc_get_type(msg->private_data, struct kdc_server);
 581         enum ndr_err_code ndr_err;
 582         krb5_enctype etype;
 583         int ret;
 584         hdb_entry_ex ent;
 585         krb5_principal principal;
 586         krb5_keyblock keyblock;
 587         Key *key;
 588
 589         /* There is no reply to this request */
 590         r->out.generic_reply = data_blob(NULL, 0);
 591
 592         ndr_err = ndr_pull_struct_blob(&r->in.generic_request, msg, &pac_validate,
 593                                        (ndr_pull_flags_fn_t)ndr_pull_PAC_Validate);
 594         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
 595                 return NT_STATUS_INVALID_PARAMETER;
 596         }
 597
 598         if (pac_validate.MessageType != 3) {
 599                 /* We don't implement any other message types - such as certificate validation - yet */
 600                 return NT_STATUS_INVALID_PARAMETER;
 601         }
 602
 603         if (pac_validate.ChecksumAndSignature.length != (pac_validate.ChecksumLength + pac_validate.SignatureLength)
 604             || pac_validate.ChecksumAndSignature.length < pac_validate.ChecksumLength
 605             || pac_validate.ChecksumAndSignature.length < pac_validate.SignatureLength ) {
 606                 return NT_STATUS_INVALID_PARAMETER;
 607         }
 608
 609         srv_sig = data_blob_const(pac_validate.ChecksumAndSignature.data,
 610                                   pac_validate.ChecksumLength);
 611
 612         if (pac_validate.SignatureType == CKSUMTYPE_HMAC_MD5) {
 613                 etype = ETYPE_ARCFOUR_HMAC_MD5;
 614         } else {
 615                 ret = krb5_cksumtype_to_enctype(kdc->smb_krb5_context->krb5_context, pac_validate.SignatureType,
 616                                                 &etype);
 617                 if (ret != 0) {
 618                         return NT_STATUS_LOGON_FAILURE;
 619                 }
 620         }
 621
 622         ret = krb5_make_principal(kdc->smb_krb5_context->krb5_context, &principal,
 623                                   lpcfg_realm(kdc->task->lp_ctx),
 624                                   "krbtgt", lpcfg_realm(kdc->task->lp_ctx),
 625                                   NULL);
 626
 627         if (ret != 0) {
 628                 return NT_STATUS_NO_MEMORY;
 629         }
 630
 631         ret = kdc->config->db[0]->hdb_fetch(kdc->smb_krb5_context->krb5_context,
 632                                             kdc->config->db[0],
 633                                             principal,
 634                                             HDB_F_GET_KRBTGT | HDB_F_DECRYPT,
 635                                             &ent);
 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
 641                 return NT_STATUS_LOGON_FAILURE;
 642         }
 643
 644         ret = hdb_enctype2key(kdc->smb_krb5_context->krb5_context, &ent.entry, etype, &key);
 645
 646         if (ret != 0) {
 647                 hdb_free_entry(kdc->smb_krb5_context->krb5_context, &ent);
 648                 krb5_free_principal(kdc->smb_krb5_context->krb5_context, principal);
 649                 return NT_STATUS_LOGON_FAILURE;
 650         }
 651
 652         keyblock = key->key;
 653
 654         kdc_sig.type = pac_validate.SignatureType;
 655         kdc_sig.signature = data_blob_const(&pac_validate.ChecksumAndSignature.data[pac_validate.ChecksumLength],
 656                                             pac_validate.SignatureLength);
 657         ret = check_pac_checksum(msg, srv_sig, &kdc_sig,
 658                            kdc->smb_krb5_context->krb5_context, &keyblock);
 659
 660         hdb_free_entry(kdc->smb_krb5_context->krb5_context, &ent);
 661         krb5_free_principal(kdc->smb_krb5_context->krb5_context, principal);
 662
 663         if (ret != 0) {
 664                 return NT_STATUS_LOGON_FAILURE;
 665         }
 666
 667         return NT_STATUS_OK;
 668 }
 669
 670
 671 /*
 672   startup the kdc task
 673 */
 674 static void kdc_task_init(struct task_server *task)
 675 {
 676         struct kdc_server *kdc;
 677         NTSTATUS status;
 678         krb5_error_code ret;
 679         struct interface *ifaces;
 680
 681         switch (lpcfg_server_role(task->lp_ctx)) {
 682         case ROLE_STANDALONE:
 683                 task_server_terminate(task, "kdc: no KDC required in standalone configuration", false);
 684                 return;
 685         case ROLE_DOMAIN_MEMBER:
 686                 task_server_terminate(task, "kdc: no KDC required in member server configuration", false);
 687                 return;
 688         case ROLE_DOMAIN_CONTROLLER:
 689                 /* Yes, we want a KDC */
 690                 break;
 691         }
 692
 693         load_interfaces(task, lpcfg_interfaces(task->lp_ctx), &ifaces);
 694
 695         if (iface_count(ifaces) == 0) {
 696                 task_server_terminate(task, "kdc: no network interfaces configured", false);
 697                 return;
 698         }
 699
 700         task_server_set_title(task, "task[kdc]");
 701
 702         kdc = talloc(task, struct kdc_server);
 703         if (kdc == NULL) {
 704                 task_server_terminate(task, "kdc: out of memory", true);
 705                 return;
 706         }
 707
 708         kdc->task = task;
 709
 710         initialize_krb5_error_table();
 711
 712         ret = smb_krb5_init_context(kdc, task->event_ctx, task->lp_ctx, &kdc->smb_krb5_context);
 713         if (ret) {
 714                 DEBUG(1,("kdc_task_init: krb5_init_context failed (%s)\n",
 715                          error_message(ret)));
 716                 task_server_terminate(task, "kdc: krb5_init_context failed", true);
 717                 return;
 718         }
 719
 720         krb5_add_et_list(kdc->smb_krb5_context->krb5_context, initialize_hdb_error_table_r);
 721
 722         ret = krb5_kdc_get_config(kdc->smb_krb5_context->krb5_context,
 723                                   &kdc->config);
 724         if(ret) {
 725                 task_server_terminate(task, "kdc: failed to get KDC configuration", true);
 726                 return;
 727         }
 728
 729         kdc->config->logf = kdc->smb_krb5_context->logf;
 730         kdc->config->db = talloc(kdc, struct HDB *);
 731         if (!kdc->config->db) {
 732                 task_server_terminate(task, "kdc: out of memory", true);
 733                 return;
 734         }
 735         kdc->config->num_db = 1;
 736
 737         /* Register hdb-samba4 hooks for use as a keytab */
 738
 739         kdc->base_ctx = talloc_zero(kdc, struct samba_kdc_base_context);
 740         if (!kdc->base_ctx) {
 741                 task_server_terminate(task, "kdc: out of memory", true);
 742                 return;
 743         }
 744
 745         kdc->base_ctx->ev_ctx = task->event_ctx;
 746         kdc->base_ctx->lp_ctx = task->lp_ctx;
 747
 748         status = hdb_samba4_create_kdc(kdc->base_ctx,
 749                                        kdc->smb_krb5_context->krb5_context,
 750                                        &kdc->config->db[0]);
 751         if (!NT_STATUS_IS_OK(status)) {
 752                 task_server_terminate(task, "kdc: hdb_samba4_create_kdc (setup KDC database) failed", true);
 753                 return;
 754         }
 755
 756         ret = krb5_plugin_register(kdc->smb_krb5_context->krb5_context,
 757                                    PLUGIN_TYPE_DATA, "hdb",
 758                                    &hdb_samba4);
 759         if(ret) {
 760                 task_server_terminate(task, "kdc: failed to register hdb plugin", true);
 761                 return;
 762         }
 763
 764         ret = krb5_kt_register(kdc->smb_krb5_context->krb5_context, &hdb_kt_ops);
 765         if(ret) {
 766                 task_server_terminate(task, "kdc: failed to register keytab plugin", true);
 767                 return;
 768         }
 769
 770         /* Register WinDC hooks */
 771         ret = krb5_plugin_register(kdc->smb_krb5_context->krb5_context,
 772                                    PLUGIN_TYPE_DATA, "windc",
 773                                    &windc_plugin_table);
 774         if(ret) {
 775                 task_server_terminate(task, "kdc: failed to register windc plugin", true);
 776                 return;
 777         }
 778
 779         krb5_kdc_windc_init(kdc->smb_krb5_context->krb5_context);
 780
 781         /* start listening on the configured network interfaces */
 782         status = kdc_startup_interfaces(kdc, task->lp_ctx, ifaces);
 783         if (!NT_STATUS_IS_OK(status)) {
 784                 task_server_terminate(task, "kdc failed to setup interfaces", true);
 785                 return;
 786         }
 787
 788         status = IRPC_REGISTER(task->msg_ctx, irpc, KDC_CHECK_GENERIC_KERBEROS,
 789                                kdc_check_generic_kerberos, kdc);
 790         if (!NT_STATUS_IS_OK(status)) {
 791                 task_server_terminate(task, "nbtd failed to setup monitoring", true);
 792                 return;
 793         }
 794
 795         irpc_add_name(task->msg_ctx, "kdc_server");
 796 }
 797
 798
 799 /* called at smbd startup - register ourselves as a server service */
 800 NTSTATUS server_service_kdc_init(void)
 801 {
 802         return register_server_service("kdc", kdc_task_init);
 803 }