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/process_model.h"
  26 #include "lib/tsocket/tsocket.h"
  27 #include "libcli/util/tstream.h"
  28 #include "lib/messaging/irpc.h"
  29 #include "librpc/gen_ndr/ndr_irpc.h"
  30 #include "librpc/gen_ndr/ndr_krb5pac.h"
  31 #include "lib/stream/packet.h"
  32 #include "lib/socket/netif.h"
  33 #include "param/param.h"
  34 #include "kdc/kdc-glue.h"
  35 #include "dsdb/samdb/samdb.h"
  36 #include "auth/session.h"
  37
  38 extern struct krb5plugin_windc_ftable windc_plugin_table;
  39 extern struct hdb_method hdb_samba4;
  40
  41 static void kdc_tcp_terminate_connection(struct kdc_tcp_connection *kdcconn, const char *reason)
  42 {
  43         stream_terminate_connection(kdcconn->conn, reason);
  44 }
  45
  46 static void kdc_tcp_recv(struct stream_connection *conn, uint16_t flags)
  47 {
  48         struct kdc_tcp_connection *kdcconn = talloc_get_type(conn->private_data,
  49                                                              struct kdc_tcp_connection);
  50         /* this should never be triggered! */
  51         kdc_tcp_terminate_connection(kdcconn, "kdc_tcp_recv: called");
  52 }
  53
  54 static void kdc_tcp_send(struct stream_connection *conn, uint16_t flags)
  55 {
  56         struct kdc_tcp_connection *kdcconn = talloc_get_type(conn->private_data,
  57                                                              struct kdc_tcp_connection);
  58         /* this should never be triggered! */
  59         kdc_tcp_terminate_connection(kdcconn, "kdc_tcp_send: called");
  60 }
  61
  62 /**
  63    Wrapper for krb5_kdc_process_krb5_request, converting to/from Samba
  64    calling conventions
  65 */
  66
  67 static enum kdc_process_ret kdc_process(struct kdc_server *kdc,
  68                                         TALLOC_CTX *mem_ctx,
  69                                         DATA_BLOB *input,
  70                                         DATA_BLOB *reply,
  71                                         struct tsocket_address *peer_addr,
  72                                         struct tsocket_address *my_addr,
  73                                         int datagram_reply)
  74 {
  75         int ret;
  76         char *pa;
  77         struct sockaddr_storage ss;
  78         krb5_data k5_reply;
  79         krb5_data_zero(&k5_reply);
  80
  81         krb5_kdc_update_time(NULL);
  82
  83         ret = tsocket_address_bsd_sockaddr(peer_addr, (struct sockaddr *) &ss,
  84                                 sizeof(struct sockaddr_storage));
  85         if (ret < 0) {
  86                 return KDC_PROCESS_FAILED;
  87         }
  88         pa = tsocket_address_string(peer_addr, mem_ctx);
  89         if (pa == NULL) {
  90                 return KDC_PROCESS_FAILED;
  91         }
  92
  93         DEBUG(10,("Received KDC packet of length %lu from %s\n",
  94                                 (long)input->length - 4, pa));
  95
  96         ret = krb5_kdc_process_krb5_request(kdc->smb_krb5_context->krb5_context,
  97                                             kdc->config,
  98                                             input->data, input->length,
  99                                             &k5_reply,
 100                                             pa,
 101                                             (struct sockaddr *) &ss,
 102                                             datagram_reply);
 103         if (ret == -1) {
 104                 *reply = data_blob(NULL, 0);
 105                 return KDC_PROCESS_FAILED;
 106         }
 107
 108         if (ret == HDB_ERR_NOT_FOUND_HERE) {
 109                 *reply = data_blob(NULL, 0);
 110                 return KDC_PROCESS_PROXY;
 111         }
 112
 113         if (k5_reply.length) {
 114                 *reply = data_blob_talloc(mem_ctx, k5_reply.data, k5_reply.length);
 115                 krb5_data_free(&k5_reply);
 116         } else {
 117                 *reply = data_blob(NULL, 0);
 118         }
 119         return KDC_PROCESS_OK;
 120 }
 121
 122 static void kdc_tcp_call_writev_done(struct tevent_req *subreq);
 123
 124 static void kdc_tcp_call_loop(struct tevent_req *subreq)
 125 {
 126         struct kdc_tcp_connection *kdc_conn = tevent_req_callback_data(subreq,
 127                                       struct kdc_tcp_connection);
 128         struct kdc_tcp_call *call;
 129         NTSTATUS status;
 130         enum kdc_process_ret ret;
 131
 132         call = talloc(kdc_conn, struct kdc_tcp_call);
 133         if (call == NULL) {
 134                 kdc_tcp_terminate_connection(kdc_conn, "kdc_tcp_call_loop: "
 135                                 "no memory for kdc_tcp_call");
 136                 return;
 137         }
 138         call->kdc_conn = kdc_conn;
 139
 140         status = tstream_read_pdu_blob_recv(subreq,
 141                                             call,
 142                                             &call->in);
 143         TALLOC_FREE(subreq);
 144         if (!NT_STATUS_IS_OK(status)) {
 145                 const char *reason;
 146
 147                 reason = talloc_asprintf(call, "kdc_tcp_call_loop: "
 148                                          "tstream_read_pdu_blob_recv() - %s",
 149                                          nt_errstr(status));
 150                 if (!reason) {
 151                         reason = nt_errstr(status);
 152                 }
 153
 154                 kdc_tcp_terminate_connection(kdc_conn, reason);
 155                 return;
 156         }
 157
 158         DEBUG(10,("Received krb5 TCP packet of length %lu from %s\n",
 159                  (long) call->in.length,
 160                  tsocket_address_string(kdc_conn->conn->remote_address, call)));
 161
 162         /* skip length header */
 163         call->in.data +=4;
 164         call->in.length -= 4;
 165
 166         /* Call krb5 */
 167         ret = kdc_conn->kdc_socket->process(kdc_conn->kdc_socket->kdc,
 168                                            call,
 169                                            &call->in,
 170                                            &call->out,
 171                                            kdc_conn->conn->remote_address,
 172                                            kdc_conn->conn->local_address,
 173                                            0 /* Stream */);
 174         if (ret == KDC_PROCESS_FAILED) {
 175                 kdc_tcp_terminate_connection(kdc_conn,
 176                                 "kdc_tcp_call_loop: process function failed");
 177                 return;
 178         }
 179
 180         if (ret == KDC_PROCESS_PROXY) {
 181                 if (!kdc_conn->kdc_socket->kdc->am_rodc) {
 182                         kdc_tcp_terminate_connection(kdc_conn,
 183                                                      "kdc_tcp_call_loop: proxying requested when not RODC");
 184                         return;
 185                 }
 186                 kdc_tcp_proxy(kdc_conn->kdc_socket->kdc, kdc_conn, call,
 187                               tsocket_address_inet_port(kdc_conn->conn->local_address));
 188                 goto done;
 189         }
 190
 191         /* First add the length of the out buffer */
 192         RSIVAL(call->out_hdr, 0, call->out.length);
 193         call->out_iov[0].iov_base = (char *) call->out_hdr;
 194         call->out_iov[0].iov_len = 4;
 195
 196         call->out_iov[1].iov_base = (char *) call->out.data;
 197         call->out_iov[1].iov_len = call->out.length;
 198
 199         subreq = tstream_writev_queue_send(call,
 200                                            kdc_conn->conn->event.ctx,
 201                                            kdc_conn->tstream,
 202                                            kdc_conn->send_queue,
 203                                            call->out_iov, 2);
 204         if (subreq == NULL) {
 205                 kdc_tcp_terminate_connection(kdc_conn, "kdc_tcp_call_loop: "
 206                                 "no memory for tstream_writev_queue_send");
 207                 return;
 208         }
 209         tevent_req_set_callback(subreq, kdc_tcp_call_writev_done, call);
 210
 211 done:
 212         /*
 213          * The krb5 tcp pdu's has the length as 4 byte (initial_read_size),
 214          * packet_full_request_u32 provides the pdu length then.
 215          */
 216         subreq = tstream_read_pdu_blob_send(kdc_conn,
 217                                             kdc_conn->conn->event.ctx,
 218                                             kdc_conn->tstream,
 219                                             4, /* initial_read_size */
 220                                             packet_full_request_u32,
 221                                             kdc_conn);
 222         if (subreq == NULL) {
 223                 kdc_tcp_terminate_connection(kdc_conn, "kdc_tcp_call_loop: "
 224                                 "no memory for tstream_read_pdu_blob_send");
 225                 return;
 226         }
 227         tevent_req_set_callback(subreq, kdc_tcp_call_loop, kdc_conn);
 228 }
 229
 230 static void kdc_tcp_call_writev_done(struct tevent_req *subreq)
 231 {
 232         struct kdc_tcp_call *call = tevent_req_callback_data(subreq,
 233                         struct kdc_tcp_call);
 234         int sys_errno;
 235         int rc;
 236
 237         rc = tstream_writev_queue_recv(subreq, &sys_errno);
 238         TALLOC_FREE(subreq);
 239         if (rc == -1) {
 240                 const char *reason;
 241
 242                 reason = talloc_asprintf(call, "kdc_tcp_call_writev_done: "
 243                                          "tstream_writev_queue_recv() - %d:%s",
 244                                          sys_errno, strerror(sys_errno));
 245                 if (!reason) {
 246                         reason = "kdc_tcp_call_writev_done: tstream_writev_queue_recv() failed";
 247                 }
 248
 249                 kdc_tcp_terminate_connection(call->kdc_conn, reason);
 250                 return;
 251         }
 252
 253         /* We don't care about errors */
 254
 255         talloc_free(call);
 256 }
 257
 258 /*
 259   called when we get a new connection
 260 */
 261 static void kdc_tcp_accept(struct stream_connection *conn)
 262 {
 263         struct kdc_socket *kdc_socket;
 264         struct kdc_tcp_connection *kdc_conn;
 265         struct tevent_req *subreq;
 266         int rc;
 267
 268         kdc_conn = talloc_zero(conn, struct kdc_tcp_connection);
 269         if (kdc_conn == NULL) {
 270                 stream_terminate_connection(conn,
 271                                 "kdc_tcp_accept: out of memory");
 272                 return;
 273         }
 274
 275         kdc_conn->send_queue = tevent_queue_create(conn, "kdc_tcp_accept");
 276         if (kdc_conn->send_queue == NULL) {
 277                 stream_terminate_connection(conn,
 278                                 "kdc_tcp_accept: out of memory");
 279                 return;
 280         }
 281
 282         kdc_socket = talloc_get_type(conn->private_data, struct kdc_socket);
 283
 284         TALLOC_FREE(conn->event.fde);
 285
 286         rc = tstream_bsd_existing_socket(kdc_conn,
 287                         socket_get_fd(conn->socket),
 288                         &kdc_conn->tstream);
 289         if (rc < 0) {
 290                 stream_terminate_connection(conn,
 291                                 "kdc_tcp_accept: out of memory");
 292                 return;
 293         }
 294
 295         kdc_conn->conn = conn;
 296         kdc_conn->kdc_socket = kdc_socket;
 297         conn->private_data = kdc_conn;
 298
 299         /*
 300          * The krb5 tcp pdu's has the length as 4 byte (initial_read_size),
 301          * packet_full_request_u32 provides the pdu length then.
 302          */
 303         subreq = tstream_read_pdu_blob_send(kdc_conn,
 304                                             kdc_conn->conn->event.ctx,
 305                                             kdc_conn->tstream,
 306                                             4, /* initial_read_size */
 307                                             packet_full_request_u32,
 308                                             kdc_conn);
 309         if (subreq == NULL) {
 310                 kdc_tcp_terminate_connection(kdc_conn, "kdc_tcp_accept: "
 311                                 "no memory for tstream_read_pdu_blob_send");
 312                 return;
 313         }
 314         tevent_req_set_callback(subreq, kdc_tcp_call_loop, kdc_conn);
 315 }
 316
 317 static const struct stream_server_ops kdc_tcp_stream_ops = {
 318         .name                   = "kdc_tcp",
 319         .accept_connection      = kdc_tcp_accept,
 320         .recv_handler           = kdc_tcp_recv,
 321         .send_handler           = kdc_tcp_send
 322 };
 323
 324 static void kdc_udp_call_sendto_done(struct tevent_req *subreq);
 325
 326 static void kdc_udp_call_loop(struct tevent_req *subreq)
 327 {
 328         struct kdc_udp_socket *sock = tevent_req_callback_data(subreq,
 329                                       struct kdc_udp_socket);
 330         struct kdc_udp_call *call;
 331         uint8_t *buf;
 332         ssize_t len;
 333         int sys_errno;
 334         enum kdc_process_ret ret;
 335
 336         call = talloc(sock, struct kdc_udp_call);
 337         if (call == NULL) {
 338                 talloc_free(call);
 339                 goto done;
 340         }
 341
 342         len = tdgram_recvfrom_recv(subreq, &sys_errno,
 343                                    call, &buf, &call->src);
 344         TALLOC_FREE(subreq);
 345         if (len == -1) {
 346                 talloc_free(call);
 347                 goto done;
 348         }
 349
 350         call->in.data = buf;
 351         call->in.length = len;
 352
 353         DEBUG(10,("Received krb5 UDP packet of length %lu from %s\n",
 354                  (long)call->in.length,
 355                  tsocket_address_string(call->src, call)));
 356
 357         /* Call krb5 */
 358         ret = sock->kdc_socket->process(sock->kdc_socket->kdc,
 359                                        call,
 360                                        &call->in,
 361                                        &call->out,
 362                                        call->src,
 363                                        sock->kdc_socket->local_address,
 364                                        1 /* Datagram */);
 365         if (ret == KDC_PROCESS_FAILED) {
 366                 talloc_free(call);
 367                 goto done;
 368         }
 369
 370         if (ret == KDC_PROCESS_PROXY) {
 371                 if (!sock->kdc_socket->kdc->am_rodc) {
 372                         DEBUG(0,("kdc_udp_call_loop: proxying requested when not RODC"));
 373                         talloc_free(call);
 374                         goto done;
 375                 }
 376                 kdc_udp_proxy(sock->kdc_socket->kdc, sock, call,
 377                               tsocket_address_inet_port(sock->kdc_socket->local_address));
 378                 goto done;
 379         }
 380
 381         subreq = tdgram_sendto_queue_send(call,
 382                                           sock->kdc_socket->kdc->task->event_ctx,
 383                                           sock->dgram,
 384                                           sock->send_queue,
 385                                           call->out.data,
 386                                           call->out.length,
 387                                           call->src);
 388         if (subreq == NULL) {
 389                 talloc_free(call);
 390                 goto done;
 391         }
 392         tevent_req_set_callback(subreq, kdc_udp_call_sendto_done, call);
 393
 394 done:
 395         subreq = tdgram_recvfrom_send(sock,
 396                                       sock->kdc_socket->kdc->task->event_ctx,
 397                                       sock->dgram);
 398         if (subreq == NULL) {
 399                 task_server_terminate(sock->kdc_socket->kdc->task,
 400                                       "no memory for tdgram_recvfrom_send",
 401                                       true);
 402                 return;
 403         }
 404         tevent_req_set_callback(subreq, kdc_udp_call_loop, sock);
 405 }
 406
 407 static void kdc_udp_call_sendto_done(struct tevent_req *subreq)
 408 {
 409         struct kdc_udp_call *call = tevent_req_callback_data(subreq,
 410                                        struct kdc_udp_call);
 411         ssize_t ret;
 412         int sys_errno;
 413
 414         ret = tdgram_sendto_queue_recv(subreq, &sys_errno);
 415
 416         /* We don't care about errors */
 417
 418         talloc_free(call);
 419 }
 420
 421 /*
 422   start listening on the given address
 423 */
 424 static NTSTATUS kdc_add_socket(struct kdc_server *kdc,
 425                                const struct model_ops *model_ops,
 426                                const char *name,
 427                                const char *address,
 428                                uint16_t port,
 429                                kdc_process_fn_t process,
 430                                bool udp_only)
 431 {
 432         struct kdc_socket *kdc_socket;
 433         struct kdc_udp_socket *kdc_udp_socket;
 434         struct tevent_req *udpsubreq;
 435         NTSTATUS status;
 436         int ret;
 437
 438         kdc_socket = talloc(kdc, struct kdc_socket);
 439         NT_STATUS_HAVE_NO_MEMORY(kdc_socket);
 440
 441         kdc_socket->kdc = kdc;
 442         kdc_socket->process = process;
 443
 444         ret = tsocket_address_inet_from_strings(kdc_socket, "ip",
 445                                                 address, port,
 446                                                 &kdc_socket->local_address);
 447         if (ret != 0) {
 448                 status = map_nt_error_from_unix(errno);
 449                 return status;
 450         }
 451
 452         if (!udp_only) {
 453                 status = stream_setup_socket(kdc->task,
 454                                              kdc->task->event_ctx,
 455                                              kdc->task->lp_ctx,
 456                                              model_ops,
 457                                              &kdc_tcp_stream_ops,
 458                                              "ip", address, &port,
 459                                              lpcfg_socket_options(kdc->task->lp_ctx),
 460                                              kdc_socket);
 461                 if (!NT_STATUS_IS_OK(status)) {
 462                         DEBUG(0,("Failed to bind to %s:%u TCP - %s\n",
 463                                  address, port, nt_errstr(status)));
 464                         talloc_free(kdc_socket);
 465                         return status;
 466                 }
 467         }
 468
 469         kdc_udp_socket = talloc(kdc_socket, struct kdc_udp_socket);
 470         NT_STATUS_HAVE_NO_MEMORY(kdc_udp_socket);
 471
 472         kdc_udp_socket->kdc_socket = kdc_socket;
 473
 474         ret = tdgram_inet_udp_socket(kdc_socket->local_address,
 475                                      NULL,
 476                                      kdc_udp_socket,
 477                                      &kdc_udp_socket->dgram);
 478         if (ret != 0) {
 479                 status = map_nt_error_from_unix(errno);
 480                 DEBUG(0,("Failed to bind to %s:%u UDP - %s\n",
 481                          address, port, nt_errstr(status)));
 482                 return status;
 483         }
 484
 485         kdc_udp_socket->send_queue = tevent_queue_create(kdc_udp_socket,
 486                                                          "kdc_udp_send_queue");
 487         NT_STATUS_HAVE_NO_MEMORY(kdc_udp_socket->send_queue);
 488
 489         udpsubreq = tdgram_recvfrom_send(kdc_udp_socket,
 490                                          kdc->task->event_ctx,
 491                                          kdc_udp_socket->dgram);
 492         NT_STATUS_HAVE_NO_MEMORY(udpsubreq);
 493         tevent_req_set_callback(udpsubreq, kdc_udp_call_loop, kdc_udp_socket);
 494
 495         return NT_STATUS_OK;
 496 }
 497
 498
 499 /*
 500   setup our listening sockets on the configured network interfaces
 501 */
 502 static NTSTATUS kdc_startup_interfaces(struct kdc_server *kdc, struct loadparm_context *lp_ctx,
 503                                        struct interface *ifaces)
 504 {
 505         const struct model_ops *model_ops;
 506         int num_interfaces;
 507         TALLOC_CTX *tmp_ctx = talloc_new(kdc);
 508         NTSTATUS status;
 509         int i;
 510         uint16_t kdc_port = lpcfg_krb5_port(lp_ctx);
 511         uint16_t kpasswd_port = lpcfg_kpasswd_port(lp_ctx);
 512         bool done_wildcard = false;
 513
 514         /* within the kdc task we want to be a single process, so
 515            ask for the single process model ops and pass these to the
 516            stream_setup_socket() call. */
 517         model_ops = process_model_startup("single");
 518         if (!model_ops) {
 519                 DEBUG(0,("Can't find 'single' process model_ops\n"));
 520                 return NT_STATUS_INTERNAL_ERROR;
 521         }
 522
 523         num_interfaces = iface_count(ifaces);
 524
 525         /* if we are allowing incoming packets from any address, then
 526            we need to bind to the wildcard address */
 527         if (!lpcfg_bind_interfaces_only(lp_ctx)) {
 528                 if (kdc_port) {
 529                         status = kdc_add_socket(kdc, model_ops,
 530                                                 "kdc", "0.0.0.0", kdc_port,
 531                                                 kdc_process, false);
 532                         NT_STATUS_NOT_OK_RETURN(status);
 533                 }
 534
 535                 if (kpasswd_port) {
 536                         status = kdc_add_socket(kdc, model_ops,
 537                                                 "kpasswd", "0.0.0.0", kpasswd_port,
 538                                                 kpasswdd_process, false);
 539                         NT_STATUS_NOT_OK_RETURN(status);
 540                 }
 541                 done_wildcard = true;
 542         }
 543
 544         for (i=0; i<num_interfaces; i++) {
 545                 const char *address = talloc_strdup(tmp_ctx, iface_n_ip(ifaces, i));
 546
 547                 if (kdc_port) {
 548                         status = kdc_add_socket(kdc, model_ops,
 549                                                 "kdc", address, kdc_port,
 550                                                 kdc_process, done_wildcard);
 551                         NT_STATUS_NOT_OK_RETURN(status);
 552                 }
 553
 554                 if (kpasswd_port) {
 555                         status = kdc_add_socket(kdc, model_ops,
 556                                                 "kpasswd", address, kpasswd_port,
 557                                                 kpasswdd_process, done_wildcard);
 558                         NT_STATUS_NOT_OK_RETURN(status);
 559                 }
 560         }
 561
 562         talloc_free(tmp_ctx);
 563
 564         return NT_STATUS_OK;
 565 }
 566
 567
 568 static NTSTATUS kdc_check_generic_kerberos(struct irpc_message *msg,
 569                                  struct kdc_check_generic_kerberos *r)
 570 {
 571         struct PAC_Validate pac_validate;
 572         DATA_BLOB srv_sig;
 573         struct PAC_SIGNATURE_DATA kdc_sig;
 574         struct kdc_server *kdc = talloc_get_type(msg->private_data, struct kdc_server);
 575         enum ndr_err_code ndr_err;
 576         krb5_enctype etype;
 577         int ret;
 578         hdb_entry_ex ent;
 579         krb5_principal principal;
 580         krb5_keyblock keyblock;
 581         Key *key;
 582
 583         /* There is no reply to this request */
 584         r->out.generic_reply = data_blob(NULL, 0);
 585
 586         ndr_err = ndr_pull_struct_blob(&r->in.generic_request, msg, &pac_validate,
 587                                        (ndr_pull_flags_fn_t)ndr_pull_PAC_Validate);
 588         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
 589                 return NT_STATUS_INVALID_PARAMETER;
 590         }
 591
 592         if (pac_validate.MessageType != 3) {
 593                 /* We don't implement any other message types - such as certificate validation - yet */
 594                 return NT_STATUS_INVALID_PARAMETER;
 595         }
 596
 597         if (pac_validate.ChecksumAndSignature.length != (pac_validate.ChecksumLength + pac_validate.SignatureLength)
 598             || pac_validate.ChecksumAndSignature.length < pac_validate.ChecksumLength
 599             || pac_validate.ChecksumAndSignature.length < pac_validate.SignatureLength ) {
 600                 return NT_STATUS_INVALID_PARAMETER;
 601         }
 602
 603         srv_sig = data_blob_const(pac_validate.ChecksumAndSignature.data,
 604                                   pac_validate.ChecksumLength);
 605
 606         if (pac_validate.SignatureType == CKSUMTYPE_HMAC_MD5) {
 607                 etype = ETYPE_ARCFOUR_HMAC_MD5;
 608         } else {
 609                 ret = krb5_cksumtype_to_enctype(kdc->smb_krb5_context->krb5_context, pac_validate.SignatureType,
 610                                                 &etype);
 611                 if (ret != 0) {
 612                         return NT_STATUS_LOGON_FAILURE;
 613                 }
 614         }
 615
 616         ret = krb5_make_principal(kdc->smb_krb5_context->krb5_context, &principal,
 617                                   lpcfg_realm(kdc->task->lp_ctx),
 618                                   "krbtgt", lpcfg_realm(kdc->task->lp_ctx),
 619                                   NULL);
 620
 621         if (ret != 0) {
 622                 return NT_STATUS_NO_MEMORY;
 623         }
 624
 625         ret = kdc->config->db[0]->hdb_fetch_kvno(kdc->smb_krb5_context->krb5_context,
 626                                                  kdc->config->db[0],
 627                                                  principal,
 628                                                  HDB_F_GET_KRBTGT | HDB_F_DECRYPT,
 629                                                  0,
 630                                                  &ent);
 631
 632         if (ret != 0) {
 633                 hdb_free_entry(kdc->smb_krb5_context->krb5_context, &ent);
 634                 krb5_free_principal(kdc->smb_krb5_context->krb5_context, principal);
 635
 636                 return NT_STATUS_LOGON_FAILURE;
 637         }
 638
 639         ret = hdb_enctype2key(kdc->smb_krb5_context->krb5_context, &ent.entry, etype, &key);
 640
 641         if (ret != 0) {
 642                 hdb_free_entry(kdc->smb_krb5_context->krb5_context, &ent);
 643                 krb5_free_principal(kdc->smb_krb5_context->krb5_context, principal);
 644                 return NT_STATUS_LOGON_FAILURE;
 645         }
 646
 647         keyblock = key->key;
 648
 649         kdc_sig.type = pac_validate.SignatureType;
 650         kdc_sig.signature = data_blob_const(&pac_validate.ChecksumAndSignature.data[pac_validate.ChecksumLength],
 651                                             pac_validate.SignatureLength);
 652         ret = check_pac_checksum(msg, srv_sig, &kdc_sig,
 653                            kdc->smb_krb5_context->krb5_context, &keyblock);
 654
 655         hdb_free_entry(kdc->smb_krb5_context->krb5_context, &ent);
 656         krb5_free_principal(kdc->smb_krb5_context->krb5_context, principal);
 657
 658         if (ret != 0) {
 659                 return NT_STATUS_LOGON_FAILURE;
 660         }
 661
 662         return NT_STATUS_OK;
 663 }
 664
 665
 666 /*
 667   startup the kdc task
 668 */
 669 static void kdc_task_init(struct task_server *task)
 670 {
 671         struct kdc_server *kdc;
 672         NTSTATUS status;
 673         krb5_error_code ret;
 674         struct interface *ifaces;
 675         int ldb_ret;
 676
 677         switch (lpcfg_server_role(task->lp_ctx)) {
 678         case ROLE_STANDALONE:
 679                 task_server_terminate(task, "kdc: no KDC required in standalone configuration", false);
 680                 return;
 681         case ROLE_DOMAIN_MEMBER:
 682                 task_server_terminate(task, "kdc: no KDC required in member server configuration", false);
 683                 return;
 684         case ROLE_DOMAIN_CONTROLLER:
 685                 /* Yes, we want a KDC */
 686                 break;
 687         }
 688
 689         load_interfaces(task, lpcfg_interfaces(task->lp_ctx), &ifaces);
 690
 691         if (iface_count(ifaces) == 0) {
 692                 task_server_terminate(task, "kdc: no network interfaces configured", false);
 693                 return;
 694         }
 695
 696         task_server_set_title(task, "task[kdc]");
 697
 698         kdc = talloc_zero(task, struct kdc_server);
 699         if (kdc == NULL) {
 700                 task_server_terminate(task, "kdc: out of memory", true);
 701                 return;
 702         }
 703
 704         kdc->task = task;
 705
 706
 707         /* get a samdb connection */
 708         kdc->samdb = samdb_connect(kdc, kdc->task->event_ctx, kdc->task->lp_ctx,
 709                                    system_session(kdc->task->lp_ctx), 0);
 710         if (!kdc->samdb) {
 711                 DEBUG(1,("kdc_task_init: unable to connect to samdb\n"));
 712                 task_server_terminate(task, "kdc: krb5_init_context samdb connect failed", true);
 713                 return;
 714         }
 715
 716         ldb_ret = samdb_rodc(kdc->samdb, &kdc->am_rodc);
 717         if (ldb_ret != LDB_SUCCESS) {
 718                 DEBUG(1, ("kdc_task_init: Cannot determine if we are an RODC: %s\n",
 719                           ldb_errstring(kdc->samdb)));
 720                 task_server_terminate(task, "kdc: krb5_init_context samdb RODC connect failed", true);
 721                 return;
 722         }
 723
 724         kdc->proxy_timeout = lpcfg_parm_int(kdc->task->lp_ctx, NULL, "kdc", "proxy timeout", 5);
 725
 726         initialize_krb5_error_table();
 727
 728         ret = smb_krb5_init_context(kdc, task->event_ctx, task->lp_ctx, &kdc->smb_krb5_context);
 729         if (ret) {
 730                 DEBUG(1,("kdc_task_init: krb5_init_context failed (%s)\n",
 731                          error_message(ret)));
 732                 task_server_terminate(task, "kdc: krb5_init_context failed", true);
 733                 return;
 734         }
 735
 736         krb5_add_et_list(kdc->smb_krb5_context->krb5_context, initialize_hdb_error_table_r);
 737
 738         ret = krb5_kdc_get_config(kdc->smb_krb5_context->krb5_context,
 739                                   &kdc->config);
 740         if(ret) {
 741                 task_server_terminate(task, "kdc: failed to get KDC configuration", true);
 742                 return;
 743         }
 744
 745         kdc->config->logf = kdc->smb_krb5_context->logf;
 746         kdc->config->db = talloc(kdc, struct HDB *);
 747         if (!kdc->config->db) {
 748                 task_server_terminate(task, "kdc: out of memory", true);
 749                 return;
 750         }
 751         kdc->config->num_db = 1;
 752
 753         /* Register hdb-samba4 hooks for use as a keytab */
 754
 755         kdc->base_ctx = talloc_zero(kdc, struct samba_kdc_base_context);
 756         if (!kdc->base_ctx) {
 757                 task_server_terminate(task, "kdc: out of memory", true);
 758                 return;
 759         }
 760
 761         kdc->base_ctx->ev_ctx = task->event_ctx;
 762         kdc->base_ctx->lp_ctx = task->lp_ctx;
 763
 764         status = hdb_samba4_create_kdc(kdc->base_ctx,
 765                                        kdc->smb_krb5_context->krb5_context,
 766                                        &kdc->config->db[0]);
 767         if (!NT_STATUS_IS_OK(status)) {
 768                 task_server_terminate(task, "kdc: hdb_samba4_create_kdc (setup KDC database) failed", true);
 769                 return;
 770         }
 771
 772         ret = krb5_plugin_register(kdc->smb_krb5_context->krb5_context,
 773                                    PLUGIN_TYPE_DATA, "hdb",
 774                                    &hdb_samba4);
 775         if(ret) {
 776                 task_server_terminate(task, "kdc: failed to register hdb plugin", true);
 777                 return;
 778         }
 779
 780         ret = krb5_kt_register(kdc->smb_krb5_context->krb5_context, &hdb_kt_ops);
 781         if(ret) {
 782                 task_server_terminate(task, "kdc: failed to register keytab plugin", true);
 783                 return;
 784         }
 785
 786         /* Register WinDC hooks */
 787         ret = krb5_plugin_register(kdc->smb_krb5_context->krb5_context,
 788                                    PLUGIN_TYPE_DATA, "windc",
 789                                    &windc_plugin_table);
 790         if(ret) {
 791                 task_server_terminate(task, "kdc: failed to register windc plugin", true);
 792                 return;
 793         }
 794
 795         ret = krb5_kdc_windc_init(kdc->smb_krb5_context->krb5_context);
 796
 797         if(ret) {
 798                 task_server_terminate(task, "kdc: failed to init windc plugin", true);
 799                 return;
 800         }
 801
 802         ret = krb5_kdc_pkinit_config(kdc->smb_krb5_context->krb5_context, kdc->config);
 803
 804         if(ret) {
 805                 task_server_terminate(task, "kdc: failed to init kdc pkinit subsystem", true);
 806                 return;
 807         }
 808
 809         /* start listening on the configured network interfaces */
 810         status = kdc_startup_interfaces(kdc, task->lp_ctx, ifaces);
 811         if (!NT_STATUS_IS_OK(status)) {
 812                 task_server_terminate(task, "kdc failed to setup interfaces", true);
 813                 return;
 814         }
 815
 816         status = IRPC_REGISTER(task->msg_ctx, irpc, KDC_CHECK_GENERIC_KERBEROS,
 817                                kdc_check_generic_kerberos, kdc);
 818         if (!NT_STATUS_IS_OK(status)) {
 819                 task_server_terminate(task, "kdc failed to setup monitoring", true);
 820                 return;
 821         }
 822
 823         irpc_add_name(task->msg_ctx, "kdc_server");
 824 }
 825
 826
 827 /* called at smbd startup - register ourselves as a server service */
 828 NTSTATUS server_service_kdc_init(void)
 829 {
 830         return register_server_service("kdc", kdc_task_init);
 831 }