source3/rpc_server/rpc_worker.c

   1 /*
   2  *  Unix SMB/CIFS implementation.
   3  *
   4  *  This program is free software; you can redistribute it and/or modify
   5  *  it under the terms of the GNU General Public License as published by
   6  *  the Free Software Foundation; either version 3 of the License, or
   7  *  (at your option) any later version.
   8  *
   9  *  This program is distributed in the hope that it will be useful,
  10  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  *  GNU General Public License for more details.
  13  *
  14  *  You should have received a copy of the GNU General Public License
  15  *  along with this program; if not, see <http://www.gnu.org/licenses/>.
  16  */
  17
  18 #include "source3/include/includes.h"
  19 #include "lib/cmdline/cmdline.h"
  20 #include "rpc_worker.h"
  21 #include "rpc_config.h"
  22 #include "librpc/rpc/dcesrv_core.h"
  23 #include "librpc/rpc/dcerpc_util.h"
  24 #include "source3/librpc/gen_ndr/ndr_rpc_host.h"
  25 #include "lib/util/debug.h"
  26 #include "lib/util/fault.h"
  27 #include "rpc_server.h"
  28 #include "rpc_pipes.h"
  29 #include "source3/smbd/proto.h"
  30 #include "source3/lib/smbd_shim.h"
  31 #include "source3/lib/global_contexts.h"
  32 #include "source3/lib/util_procid.h"
  33 #include "lib/tsocket/tsocket.h"
  34 #include "libcli/named_pipe_auth/npa_tstream.h"
  35 #include "libcli/smb/smb_constants.h"
  36 #include "lib/param/param.h"
  37 #include "lib/util/idtree_random.h"
  38 #include "lib/util/tevent_unix.h"
  39 #include "lib/async_req/async_sock.h"
  40 #include "lib/util/dlinklist.h"
  41 #include "source3/include/auth.h"
  42 #include "nsswitch/winbind_client.h"
  43 #include "source3/include/messages.h"
  44 #include "libcli/security/security_token.h"
  45 #include "libcli/security/dom_sid.h"
  46 #include "source3/include/proto.h"
  47
  48 /*
  49  * This is the generic code that becomes the
  50  * template that all rpcd_* instances that
  51  * serve DCERPC can use to provide services to samba-dcerpcd.
  52  *
  53  * The external entry point is:
  54  * rpc_worker_main() which takes an argc/argv list
  55  * and two functions:
  56  *
  57  * get_interfaces() - List all interfaces that this server provides
  58  * get_servers() - Provide the RPC server implementations
  59  *
  60  * Each rpcd_* service needs only to provide
  61  * the implementations of get_interfaces() and get_servers()
  62  * and call rpc_worker_main() from their main() function
  63  * to provide services that can be connected to from samba-dcerpcd.
  64  */
  65
  66 struct rpc_worker {
  67         struct dcerpc_ncacn_conn *conns;
  68         struct server_id rpc_host_pid;
  69         struct messaging_context *msg_ctx;
  70         struct dcesrv_context *dce_ctx;
  71
  72         struct dcesrv_context_callbacks cb;
  73
  74         struct rpc_worker_status status;
  75
  76         bool done;
  77 };
  78
  79 static void rpc_worker_print_interface(
  80         FILE *f, const struct ndr_interface_table *t)
  81 {
  82         const struct ndr_interface_string_array *endpoints = t->endpoints;
  83         uint32_t i;
  84         struct ndr_syntax_id_buf id_buf;
  85
  86         fprintf(f,
  87                 "%s %s\n",
  88                 ndr_syntax_id_buf_string(&t->syntax_id, &id_buf),
  89                 t->name);
  90
  91         for (i=0; i<endpoints->count; i++) {
  92                 fprintf(f, " %s\n", endpoints->names[i]);
  93         }
  94 }
  95
  96 static NTSTATUS rpc_worker_report_status(struct rpc_worker *worker)
  97 {
  98         uint8_t buf[12];
  99         DATA_BLOB blob = { .data = buf, .length = sizeof(buf), };
 100         enum ndr_err_code ndr_err;
 101         NTSTATUS status;
 102
 103         if (DEBUGLEVEL >= 10) {
 104                 NDR_PRINT_DEBUG(rpc_worker_status, &worker->status);
 105         }
 106
 107         ndr_err = ndr_push_struct_into_fixed_blob(
 108                 &blob,
 109                 &worker->status,
 110                 (ndr_push_flags_fn_t)ndr_push_rpc_worker_status);
 111         SMB_ASSERT(NDR_ERR_CODE_IS_SUCCESS(ndr_err));
 112
 113         status = messaging_send(
 114                 worker->msg_ctx,
 115                 worker->rpc_host_pid,
 116                 MSG_RPC_WORKER_STATUS,
 117                 &blob);
 118         return status;
 119 }
 120
 121 static void rpc_worker_connection_terminated(
 122         struct dcesrv_connection *conn, void *private_data)
 123 {
 124         struct rpc_worker *worker = talloc_get_type_abort(
 125                 private_data, struct rpc_worker);
 126         struct dcerpc_ncacn_conn *ncacn_conn = talloc_get_type_abort(
 127                 conn->transport.private_data, struct dcerpc_ncacn_conn);
 128         struct dcerpc_ncacn_conn *w = NULL;
 129         NTSTATUS status;
 130         bool found = false;
 131
 132         SMB_ASSERT(worker->status.num_clients > 0);
 133
 134         for (w = worker->conns; w != NULL; w = w->next) {
 135                 if (w == ncacn_conn) {
 136                         found = true;
 137                         break;
 138                 }
 139         }
 140         SMB_ASSERT(found);
 141
 142         DLIST_REMOVE(worker->conns, ncacn_conn);
 143
 144         worker->status.num_clients -= 1;
 145
 146         status = rpc_worker_report_status(worker);
 147         if (!NT_STATUS_IS_OK(status)) {
 148                 DBG_DEBUG("rpc_worker_report_status returned %s\n",
 149                           nt_errstr(status));
 150         }
 151 }
 152
 153 static int dcesrv_connection_destructor(struct dcesrv_connection *conn)
 154 {
 155         struct dcerpc_ncacn_conn *ncacn_conn = talloc_get_type_abort(
 156                         conn->transport.private_data,
 157                         struct dcerpc_ncacn_conn);
 158
 159         if (ncacn_conn->termination_fn != NULL) {
 160                 ncacn_conn->termination_fn(conn, ncacn_conn->termination_data);
 161         }
 162
 163         return 0;
 164 }
 165
 166 /*
 167  * A new client has been passed to us from samba-dcerpcd.
 168  */
 169 static void rpc_worker_new_client(
 170         struct rpc_worker *worker,
 171         struct rpc_host_client *client,
 172         int sock)
 173 {
 174         struct dcesrv_context *dce_ctx = worker->dce_ctx;
 175         struct named_pipe_auth_req_info8 *info8 = client->npa_info8;
 176         struct tsocket_address *remote_client_addr = NULL;
 177         struct tsocket_address *local_server_addr = NULL;
 178         struct dcerpc_binding *b = NULL;
 179         enum dcerpc_transport_t transport;
 180         struct dcesrv_endpoint *ep = NULL;
 181         struct tstream_context *tstream = NULL;
 182         struct dcerpc_ncacn_conn *ncacn_conn = NULL;
 183         struct dcesrv_connection *dcesrv_conn = NULL;
 184         DATA_BLOB buffer = { .data = NULL };
 185         struct ncacn_packet *pkt = NULL;
 186         struct security_token *token = NULL;
 187         uint32_t npa_flags, state_flags;
 188         bool found_npa_flags;
 189         NTSTATUS status;
 190         int ret;
 191
 192         DBG_DEBUG("Got new conn sock %d for binding %s\n",
 193                   sock,
 194                   client->binding);
 195
 196         status = dcerpc_parse_binding(client, client->binding, &b);
 197         if (!NT_STATUS_IS_OK(status)) {
 198                 DBG_DEBUG("dcerpc_parse_binding(%s) failed: %s\n",
 199                           client->binding,
 200                           nt_errstr(status));
 201                 goto fail;
 202         }
 203         transport = dcerpc_binding_get_transport(b);
 204
 205         status = dcesrv_find_endpoint(dce_ctx, b, &ep);
 206
 207         if (NT_STATUS_EQUAL(status, NT_STATUS_NOT_FOUND) &&
 208             ((transport == NCACN_IP_TCP) || (transport == NCALRPC)) &&
 209             (dcerpc_binding_get_string_option(b, "endpoint") != NULL)) {
 210                 /*
 211                  * We have two kinds of servers: Those who explicitly
 212                  * bind to a port (e.g. 135 for epmapper) and those
 213                  * who just specify a transport. The client specified
 214                  * a port (or socket name), but we did not find this
 215                  * in the list of servers having specified a
 216                  * port. Retry just matching for the transport,
 217                  * catching the servers that did not explicitly
 218                  * specify a port.
 219                  *
 220                  * This is not fully correct, what we should do is
 221                  * that once the port the server listens on has been
 222                  * finalized we should mark this in the server list,
 223                  * but for now it works. We don't have the same RPC
 224                  * interface listening twice on different ports.
 225                  */
 226                 struct dcerpc_binding *b_without_port = dcerpc_binding_dup(
 227                         client, b);
 228                 if (b_without_port == NULL) {
 229                         status = NT_STATUS_NO_MEMORY;
 230                         goto fail;
 231                 }
 232
 233                 status = dcerpc_binding_set_string_option(
 234                         b_without_port, "endpoint", NULL);
 235                 if (!NT_STATUS_IS_OK(status)) {
 236                         DBG_DEBUG("Could not delete endpoint: %s\n",
 237                                   nt_errstr(status));
 238                         TALLOC_FREE(b_without_port);
 239                         goto fail;
 240                 }
 241
 242                 status = dcesrv_find_endpoint(dce_ctx, b_without_port, &ep);
 243
 244                 TALLOC_FREE(b_without_port);
 245         }
 246
 247         if (!NT_STATUS_IS_OK(status)) {
 248                 DBG_DEBUG("Could not find endpoint for %s: %s\n",
 249                           client->binding,
 250                           nt_errstr(status));
 251                 goto fail;
 252         }
 253
 254         ncacn_conn = talloc(dce_ctx, struct dcerpc_ncacn_conn);
 255         if (ncacn_conn == NULL) {
 256                 DBG_DEBUG("talloc failed\n");
 257                 goto fail;
 258         }
 259         *ncacn_conn = (struct dcerpc_ncacn_conn) {
 260                 .endpoint = ep,
 261                 .sock = sock,
 262                 .termination_fn = rpc_worker_connection_terminated,
 263                 .termination_data = worker,
 264         };
 265
 266         if (transport == NCALRPC) {
 267                 ret = tsocket_address_unix_from_path(ncacn_conn,
 268                                                      info8->remote_client_addr,
 269                                                      &remote_client_addr);
 270                 if (ret == -1) {
 271                         DBG_DEBUG("tsocket_address_unix_from_path"
 272                                   "(%s) failed: %s\n",
 273                                   info8->remote_client_addr,
 274                                   strerror(errno));
 275                         goto fail;
 276                 }
 277
 278                 ncacn_conn->remote_client_name =
 279                         talloc_strdup(ncacn_conn, info8->remote_client_name);
 280                 if (ncacn_conn->remote_client_name == NULL) {
 281                         DBG_DEBUG("talloc_strdup(%s) failed\n",
 282                                   info8->remote_client_name);
 283                         goto fail;
 284                 }
 285
 286                 ret = tsocket_address_unix_from_path(ncacn_conn,
 287                                                      info8->local_server_addr,
 288                                                      &local_server_addr);
 289                 if (ret == -1) {
 290                         DBG_DEBUG("tsocket_address_unix_from_path"
 291                                   "(%s) failed: %s\n",
 292                                   info8->local_server_addr,
 293                                   strerror(errno));
 294                         goto fail;
 295                 }
 296
 297                 ncacn_conn->local_server_name =
 298                         talloc_strdup(ncacn_conn, info8->local_server_name);
 299                 if (ncacn_conn->local_server_name == NULL) {
 300                         DBG_DEBUG("talloc_strdup(%s) failed\n",
 301                                   info8->local_server_name);
 302                         goto fail;
 303                 }
 304         } else {
 305                 ret = tsocket_address_inet_from_strings(
 306                         ncacn_conn,
 307                         "ip",
 308                         info8->remote_client_addr,
 309                         info8->remote_client_port,
 310                         &remote_client_addr);
 311                 if (ret == -1) {
 312                         DBG_DEBUG("tsocket_address_inet_from_strings"
 313                                   "(%s, %" PRIu16 ") failed: %s\n",
 314                                   info8->remote_client_addr,
 315                                   info8->remote_client_port,
 316                                   strerror(errno));
 317                         goto fail;
 318                 }
 319                 ncacn_conn->remote_client_name =
 320                         talloc_strdup(ncacn_conn, info8->remote_client_name);
 321                 if (ncacn_conn->remote_client_name == NULL) {
 322                         DBG_DEBUG("talloc_strdup(%s) failed\n",
 323                                   info8->remote_client_name);
 324                         goto fail;
 325                 }
 326
 327                 ret = tsocket_address_inet_from_strings(
 328                         ncacn_conn,
 329                         "ip",
 330                         info8->local_server_addr,
 331                         info8->local_server_port,
 332                         &local_server_addr);
 333                 if (ret == -1) {
 334                         DBG_DEBUG("tsocket_address_inet_from_strings"
 335                                   "(%s, %" PRIu16 ") failed: %s\n",
 336                                   info8->local_server_addr,
 337                                   info8->local_server_port,
 338                                   strerror(errno));
 339                         goto fail;
 340                 }
 341                 ncacn_conn->local_server_name =
 342                         talloc_strdup(ncacn_conn, info8->local_server_name);
 343                 if (ncacn_conn->local_server_name == NULL) {
 344                         DBG_DEBUG("talloc_strdup(%s) failed\n",
 345                                   info8->local_server_name);
 346                         goto fail;
 347                 }
 348         }
 349
 350         if (transport == NCACN_NP) {
 351                 ret = tstream_npa_existing_socket(
 352                         ncacn_conn,
 353                         sock,
 354                         FILE_TYPE_MESSAGE_MODE_PIPE,
 355                         &tstream);
 356                 if (ret == -1) {
 357                         DBG_DEBUG("tstream_npa_existing_socket failed: %s\n",
 358                                   strerror(errno));
 359                         goto fail;
 360                 }
 361
 362                 /*
 363                  * "transport" so far is implicitly assigned by the
 364                  * socket that the client connected to, passed in from
 365                  * samba-dcerpcd via the binding. For NCACN_NP (root
 366                  * only by unix permissions) we got a
 367                  * named_pipe_auth_req_info8 where the transport can
 368                  * be overridden.
 369                  */
 370                 transport = info8->transport;
 371         } else {
 372                 ret = tstream_bsd_existing_socket(
 373                         ncacn_conn, sock, &tstream);
 374                 if (ret == -1) {
 375                         DBG_DEBUG("tstream_bsd_existing_socket failed: %s\n",
 376                                   strerror(errno));
 377                         goto fail;
 378                 }
 379         }
 380         sock = -1;
 381
 382         token = info8->session_info->session_info->security_token;
 383
 384         if (security_token_is_system(token) && (transport != NCALRPC)) {
 385                 DBG_DEBUG("System token only allowed on NCALRPC\n");
 386                 goto fail;
 387         }
 388
 389         state_flags = DCESRV_CALL_STATE_FLAG_MAY_ASYNC;
 390
 391         found_npa_flags = security_token_find_npa_flags(token, &npa_flags);
 392         if (found_npa_flags) {
 393                 if (npa_flags & SAMBA_NPA_FLAGS_WINBIND_OFF) {
 394                         state_flags |=
 395                                 DCESRV_CALL_STATE_FLAG_WINBIND_OFF;
 396                 }
 397
 398                 /*
 399                  * Delete the flags so that we don't bail in
 400                  * local_np_connect_send() on subsequent
 401                  * connects. Once we connect to another RPC service, a
 402                  * new flags sid will be added if required.
 403                  */
 404                 security_token_del_npa_flags(token);
 405         }
 406
 407         ncacn_conn->p.msg_ctx = global_messaging_context();
 408         ncacn_conn->p.transport = transport;
 409
 410         status = dcesrv_endpoint_connect(dce_ctx,
 411                                          ncacn_conn,
 412                                          ep,
 413                                          info8->session_info->session_info,
 414                                          global_event_context(),
 415                                          state_flags,
 416                                          &dcesrv_conn);
 417         if (!NT_STATUS_IS_OK(status)) {
 418                 DBG_DEBUG("Failed to connect to endpoint: %s\n",
 419                           nt_errstr(status));
 420                 goto fail;
 421         }
 422
 423         talloc_set_destructor(dcesrv_conn, dcesrv_connection_destructor);
 424
 425         dcesrv_conn->transport.private_data = ncacn_conn;
 426         dcesrv_conn->transport.report_output_data =
 427                 dcesrv_sock_report_output_data;
 428         dcesrv_conn->transport.terminate_connection =
 429                 dcesrv_transport_terminate_connection;
 430
 431         dcesrv_conn->send_queue = tevent_queue_create(
 432                 dcesrv_conn, "dcesrv send queue");
 433         if (dcesrv_conn->send_queue == NULL) {
 434                 DBG_DEBUG("tevent_queue_create failed\n");
 435                 goto fail;
 436         }
 437
 438         dcesrv_conn->stream = talloc_move(dcesrv_conn, &tstream);
 439         dcesrv_conn->local_address =
 440                 talloc_move(dcesrv_conn, &local_server_addr);
 441         dcesrv_conn->remote_address =
 442                 talloc_move(dcesrv_conn, &remote_client_addr);
 443
 444         if (client->bind_packet.length == 0) {
 445                 DBG_DEBUG("Expected bind packet\n");
 446                 goto fail;
 447         }
 448
 449         buffer = (DATA_BLOB) {
 450                 .data = talloc_move(dcesrv_conn, &client->bind_packet.data),
 451                 .length = client->bind_packet.length,
 452         };
 453
 454         pkt = talloc(dcesrv_conn, struct ncacn_packet);
 455         if (pkt == NULL) {
 456                 DBG_DEBUG("talloc failed\n");
 457                 goto fail;
 458         }
 459
 460         status = dcerpc_pull_ncacn_packet(pkt, &buffer, pkt);
 461         if (!NT_STATUS_IS_OK(status)) {
 462                 DBG_DEBUG("dcerpc_pull_ncacn_packet failed: %s\n",
 463                           nt_errstr(status));
 464                 goto fail;
 465         }
 466
 467         TALLOC_FREE(client);
 468
 469         DLIST_ADD(worker->conns, ncacn_conn);
 470         worker->status.num_clients += 1;
 471
 472         dcesrv_loop_next_packet(dcesrv_conn, pkt, buffer);
 473
 474         return;
 475 fail:
 476         TALLOC_FREE(ncacn_conn);
 477         TALLOC_FREE(dcesrv_conn);
 478         TALLOC_FREE(client);
 479         if (sock != -1) {
 480                 close(sock);
 481         }
 482
 483         /*
 484          * Parent thinks it successfully sent us a client. Tell it
 485          * that we declined.
 486          */
 487         status = rpc_worker_report_status(worker);
 488         if (!NT_STATUS_IS_OK(status)) {
 489                 DBG_DEBUG("rpc_worker_report_status returned %s\n",
 490                           nt_errstr(status));
 491         }
 492 }
 493
 494 /*
 495  * New client message processing.
 496  */
 497 static bool rpc_worker_new_client_filter(
 498         struct messaging_rec *rec, void *private_data)
 499 {
 500         struct rpc_worker *worker = talloc_get_type_abort(
 501                 private_data, struct rpc_worker);
 502         struct dcesrv_context *dce_ctx = worker->dce_ctx;
 503         struct rpc_host_client *client = NULL;
 504         enum ndr_err_code ndr_err;
 505         int sock;
 506
 507         if (rec->msg_type != MSG_RPC_HOST_NEW_CLIENT) {
 508                 return false;
 509         }
 510
 511         if (rec->num_fds != 1) {
 512                 DBG_DEBUG("Got %"PRIu8" fds\n", rec->num_fds);
 513                 return false;
 514         }
 515
 516         client = talloc(dce_ctx, struct rpc_host_client);
 517         if (client == NULL) {
 518                 DBG_DEBUG("talloc failed\n");
 519                 return false;
 520         }
 521
 522         ndr_err = ndr_pull_struct_blob_all(
 523                 &rec->buf,
 524                 client,
 525                 client,
 526                 (ndr_pull_flags_fn_t)ndr_pull_rpc_host_client);
 527         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
 528                 DBG_DEBUG("ndr_pull_rpc_host_client failed: %s\n",
 529                           ndr_errstr(ndr_err));
 530                 TALLOC_FREE(client);
 531                 return false;
 532         }
 533
 534         if (DEBUGLEVEL >= 10) {
 535                 NDR_PRINT_DEBUG(rpc_host_client, client);
 536         }
 537
 538         sock = rec->fds[0];
 539         rec->fds[0] = -1;
 540
 541         rpc_worker_new_client(worker, client, sock);
 542
 543         return false;
 544 }
 545
 546 /*
 547  * Return your status message processing.
 548  */
 549 static bool rpc_worker_status_filter(
 550         struct messaging_rec *rec, void *private_data)
 551 {
 552         struct rpc_worker *worker = talloc_get_type_abort(
 553                 private_data, struct rpc_worker);
 554         struct dcerpc_ncacn_conn *conn = NULL;
 555         FILE *f = NULL;
 556         int fd;
 557
 558         if (rec->msg_type != MSG_RPC_DUMP_STATUS) {
 559                 return false;
 560         }
 561
 562         if (rec->num_fds != 1) {
 563                 DBG_DEBUG("Got %"PRIu8" fds\n", rec->num_fds);
 564                 return false;
 565         }
 566
 567         fd = dup(rec->fds[0]);
 568         if (fd == -1) {
 569                 DBG_DEBUG("dup(%"PRIi64") failed: %s\n",
 570                           rec->fds[0],
 571                           strerror(errno));
 572                 return false;
 573         }
 574
 575         f = fdopen(fd, "w");
 576         if (f == NULL) {
 577                 DBG_DEBUG("fdopen failed: %s\n", strerror(errno));
 578                 close(fd);
 579                 return false;
 580         }
 581
 582         for (conn = worker->conns; conn != NULL; conn = conn->next) {
 583                 char *endpoint = NULL;
 584
 585                 endpoint = dcerpc_binding_string(
 586                         conn, conn->endpoint->ep_description);
 587
 588                 fprintf(f,
 589                         "endpoint=%s client=%s server=%s\n",
 590                         endpoint ? endpoint : "UNKNOWN",
 591                         conn->remote_client_name,
 592                         conn->local_server_name);
 593                 TALLOC_FREE(endpoint);
 594         }
 595
 596         fclose(f);
 597
 598         return false;
 599 }
 600
 601 /*
 602   take a reference to an existing association group
 603  */
 604 static struct dcesrv_assoc_group *rpc_worker_assoc_group_reference(
 605         struct dcesrv_connection *conn,
 606         uint32_t id)
 607 {
 608         const struct dcesrv_endpoint *endpoint = conn->endpoint;
 609         enum dcerpc_transport_t transport = dcerpc_binding_get_transport(
 610                 endpoint->ep_description);
 611         struct dcesrv_assoc_group *assoc_group = NULL;
 612         void *id_ptr = NULL;
 613
 614         /* find an association group given a assoc_group_id */
 615         id_ptr = idr_find(conn->dce_ctx->assoc_groups_idr, id & UINT16_MAX);
 616         if (id_ptr == NULL) {
 617                 DBG_NOTICE("Failed to find assoc_group 0x%08x\n", id);
 618                 return NULL;
 619         }
 620         assoc_group = talloc_get_type_abort(id_ptr, struct dcesrv_assoc_group);
 621
 622         if (assoc_group->transport != transport) {
 623                 const char *at = derpc_transport_string_by_transport(
 624                         assoc_group->transport);
 625                 const char *ct = derpc_transport_string_by_transport(
 626                         transport);
 627
 628                 DBG_NOTICE("assoc_group 0x%08x (transport %s) "
 629                            "is not available on transport %s\n",
 630                            id, at, ct);
 631                 return NULL;
 632         }
 633
 634         /*
 635          * Yes, this is a talloc_reference: The assoc group must be
 636          * removed when all connections go. This should be replaced by
 637          * adding a linked list of dcesrv_connection structs to the
 638          * assoc group.
 639          */
 640         return talloc_reference(conn, assoc_group);
 641 }
 642
 643 static int rpc_worker_assoc_group_destructor(
 644         struct dcesrv_assoc_group *assoc_group)
 645 {
 646         int ret;
 647
 648         ret = idr_remove(
 649                 assoc_group->dce_ctx->assoc_groups_idr,
 650                 assoc_group->id & UINT16_MAX);
 651         if (ret != 0) {
 652                 DBG_WARNING("Failed to remove assoc_group 0x%08x\n",
 653                             assoc_group->id);
 654         }
 655         return 0;
 656 }
 657
 658 /*
 659   allocate a new association group
 660  */
 661 static struct dcesrv_assoc_group *rpc_worker_assoc_group_new(
 662         struct dcesrv_connection *conn, uint16_t worker_index)
 663 {
 664         struct dcesrv_context *dce_ctx = conn->dce_ctx;
 665         const struct dcesrv_endpoint *endpoint = conn->endpoint;
 666         enum dcerpc_transport_t transport = dcerpc_binding_get_transport(
 667                 endpoint->ep_description);
 668         struct dcesrv_assoc_group *assoc_group = NULL;
 669         int id;
 670
 671         assoc_group = talloc_zero(conn, struct dcesrv_assoc_group);
 672         if (assoc_group == NULL) {
 673                 return NULL;
 674         }
 675
 676         /*
 677          * We use 16-bit to encode the worker index,
 678          * have 16-bits left within the worker to form a
 679          * 32-bit association group id.
 680          */
 681         id = idr_get_new_random(
 682                 dce_ctx->assoc_groups_idr, assoc_group, 1, UINT16_MAX);
 683         if (id == -1) {
 684                 talloc_free(assoc_group);
 685                 DBG_WARNING("Out of association groups!\n");
 686                 return NULL;
 687         }
 688         assoc_group->id = (((uint32_t)worker_index) << 16) | id;
 689         assoc_group->transport = transport;
 690         assoc_group->dce_ctx = dce_ctx;
 691
 692         talloc_set_destructor(assoc_group, rpc_worker_assoc_group_destructor);
 693
 694         return assoc_group;
 695 }
 696
 697 static NTSTATUS rpc_worker_assoc_group_find(
 698         struct dcesrv_call_state *call,
 699         void *private_data)
 700 {
 701         struct rpc_worker *w = talloc_get_type_abort(
 702                 private_data, struct rpc_worker);
 703         uint32_t assoc_group_id = call->pkt.u.bind.assoc_group_id;
 704
 705         if (assoc_group_id != 0) {
 706                 uint16_t worker_index = (assoc_group_id & 0xffff0000) >> 16;
 707                 if (worker_index != w->status.worker_index) {
 708                         DBG_DEBUG("Wrong worker id %"PRIu16", "
 709                                   "expected %"PRIu32"\n",
 710                                   worker_index,
 711                                   w->status.worker_index);
 712                         return NT_STATUS_NOT_FOUND;
 713                 }
 714                 call->conn->assoc_group = rpc_worker_assoc_group_reference(
 715                         call->conn, assoc_group_id);
 716         } else {
 717                 call->conn->assoc_group = rpc_worker_assoc_group_new(
 718                         call->conn, w->status.worker_index);
 719         }
 720
 721         if (call->conn->assoc_group == NULL) {
 722                 /* TODO Return correct status */
 723                 return NT_STATUS_UNSUCCESSFUL;
 724         }
 725
 726         return NT_STATUS_OK;
 727 }
 728
 729 static struct rpc_worker *rpc_worker_new(
 730         TALLOC_CTX *mem_ctx,
 731         struct messaging_context *msg_ctx)
 732 {
 733         struct rpc_worker *worker = NULL;
 734
 735         worker = talloc_zero(mem_ctx, struct rpc_worker);
 736         if (worker == NULL) {
 737                 return NULL;
 738         }
 739
 740         worker->rpc_host_pid = (struct server_id) { .pid = 0 };
 741         worker->msg_ctx = msg_ctx;
 742
 743         worker->cb = (struct dcesrv_context_callbacks) {
 744                 .log.successful_authz = dcesrv_log_successful_authz,
 745                 .auth.gensec_prepare = dcesrv_auth_gensec_prepare,
 746                 .auth.become_root = become_root,
 747                 .auth.unbecome_root = unbecome_root,
 748                 .assoc_group.find = rpc_worker_assoc_group_find,
 749                 .assoc_group.private_data = worker,
 750         };
 751
 752         worker->dce_ctx = global_dcesrv_context();
 753         if (worker->dce_ctx == NULL) {
 754                 goto fail;
 755         }
 756         dcesrv_context_set_callbacks(worker->dce_ctx, &worker->cb);
 757
 758         return worker;
 759 fail:
 760         TALLOC_FREE(worker);
 761         return NULL;
 762 }
 763
 764 static struct dcesrv_context *rpc_worker_dce_ctx(struct rpc_worker *w)
 765 {
 766         return w->dce_ctx;
 767 }
 768
 769 struct rpc_worker_state {
 770         struct tevent_context *ev;
 771         struct rpc_worker *w;
 772         struct tevent_req *new_client_req;
 773         struct tevent_req *status_req;
 774         struct tevent_req *finish_req;
 775 };
 776
 777 static void rpc_worker_done(struct tevent_req *subreq);
 778 static void rpc_worker_shutdown(
 779         struct messaging_context *msg,
 780         void *private_data,
 781         uint32_t msg_type,
 782         struct server_id server_id,
 783         DATA_BLOB *data);
 784
 785 static struct tevent_req *rpc_worker_send(
 786         TALLOC_CTX *mem_ctx,
 787         struct tevent_context *ev,
 788         struct rpc_worker *w,
 789         pid_t rpc_host_pid,
 790         int server_index,
 791         int worker_index)
 792 {
 793         struct tevent_req *req = NULL;
 794         struct rpc_worker_state *state = NULL;
 795         NTSTATUS status;
 796
 797         req = tevent_req_create(mem_ctx, &state, struct rpc_worker_state);
 798         if (req == NULL) {
 799                 return NULL;
 800         }
 801         state->ev = ev;
 802         state->w = w;
 803
 804         if ((server_index < 0) || ((unsigned)server_index > UINT32_MAX)) {
 805                 DBG_ERR("Invalid server index %d\n", server_index);
 806                 tevent_req_error(req, EINVAL);
 807                 return tevent_req_post(req, ev);
 808         }
 809         if ((worker_index < 0) || ((unsigned)worker_index > UINT16_MAX)) {
 810                 DBG_ERR("Invalid worker index %d\n", worker_index);
 811                 tevent_req_error(req, EINVAL);
 812                 return tevent_req_post(req, ev);
 813         }
 814         w->rpc_host_pid = pid_to_procid(rpc_host_pid);
 815
 816         w->status = (struct rpc_worker_status) {
 817                 .server_index = server_index,
 818                 .worker_index = worker_index,
 819         };
 820
 821         /* Wait for new client messages. */
 822         state->new_client_req = messaging_filtered_read_send(
 823                 w,
 824                 messaging_tevent_context(w->msg_ctx),
 825                 w->msg_ctx,
 826                 rpc_worker_new_client_filter,
 827                 w);
 828         if (tevent_req_nomem(state->new_client_req, req)) {
 829                 return tevent_req_post(req, ev);
 830         }
 831
 832         /* Wait for report your status messages. */
 833         state->status_req = messaging_filtered_read_send(
 834                 w,
 835                 messaging_tevent_context(w->msg_ctx),
 836                 w->msg_ctx,
 837                 rpc_worker_status_filter,
 838                 w);
 839         if (tevent_req_nomem(state->status_req, req)) {
 840                 return tevent_req_post(req, ev);
 841         }
 842
 843         /* Wait for shutdown messages. */
 844         status = messaging_register(
 845                 w->msg_ctx, req, MSG_SHUTDOWN, rpc_worker_shutdown);
 846         if (!NT_STATUS_IS_OK(status)) {
 847                 DBG_DEBUG("messaging_register failed: %s\n",
 848                           nt_errstr(status));
 849                 tevent_req_error(req, map_errno_from_nt_status(status));
 850                 return tevent_req_post(req, ev);
 851         }
 852
 853         state->finish_req = wait_for_read_send(state, ev, 0, false);
 854         if (tevent_req_nomem(state->finish_req, req)) {
 855                 return tevent_req_post(req, ev);
 856         }
 857         tevent_req_set_callback(state->finish_req, rpc_worker_done, req);
 858
 859         rpc_worker_report_status(w);
 860
 861         return req;
 862 }
 863
 864 static void rpc_worker_done(struct tevent_req *subreq)
 865 {
 866         struct tevent_req *req = tevent_req_callback_data(
 867                 subreq, struct tevent_req);
 868         int err = 0;
 869         bool ok;
 870
 871         ok = wait_for_read_recv(subreq, &err);
 872         TALLOC_FREE(subreq);
 873         if (!ok) {
 874                 tevent_req_error(req, err);
 875                 return;
 876         }
 877         tevent_req_done(req);
 878 }
 879
 880 static void rpc_worker_shutdown(
 881         struct messaging_context *msg,
 882         void *private_data,
 883         uint32_t msg_type,
 884         struct server_id server_id,
 885         DATA_BLOB *data)
 886 {
 887         struct tevent_req *req = talloc_get_type_abort(
 888                 private_data, struct tevent_req);
 889         tevent_req_done(req);
 890 }
 891
 892 static int rpc_worker_recv(struct tevent_req *req)
 893 {
 894         return tevent_req_simple_recv_unix(req);
 895 }
 896
 897 static void sig_term_handler(
 898         struct tevent_context *ev,
 899         struct tevent_signal *se,
 900         int signum,
 901         int count,
 902         void *siginfo,
 903         void *private_data)
 904 {
 905         exit(0);
 906 }
 907
 908 static void sig_hup_handler(
 909         struct tevent_context *ev,
 910         struct tevent_signal *se,
 911         int signum,
 912         int count,
 913         void *siginfo,
 914         void *private_data)
 915 {
 916         change_to_root_user();
 917         lp_load_with_shares(get_dyn_CONFIGFILE());
 918 }
 919
 920 static NTSTATUS register_ep_server(
 921         struct dcesrv_context *dce_ctx,
 922         const struct dcesrv_endpoint_server *ep_server)
 923 {
 924         NTSTATUS status;
 925
 926         DBG_DEBUG("Registering server %s\n", ep_server->name);
 927
 928         status = dcerpc_register_ep_server(ep_server);
 929         if (!NT_STATUS_IS_OK(status) &&
 930             !NT_STATUS_EQUAL(status, NT_STATUS_OBJECT_NAME_COLLISION)) {
 931                 DBG_ERR("Failed to register '%s' endpoint server: %s\n",
 932                         ep_server->name,
 933                         nt_errstr(status));
 934                 return status;
 935         }
 936
 937         status = dcesrv_init_ep_server(dce_ctx, ep_server->name);
 938         if (!NT_STATUS_IS_OK(status)) {
 939                 DBG_ERR("dcesrv_init_ep_server(%s) failed: %s\n",
 940                         ep_server->name,
 941                         nt_errstr(status));
 942                 return status;
 943         }
 944
 945         return NT_STATUS_OK;
 946 }
 947
 948 /**
 949  * @brief Main function for RPC server implementations
 950  *
 951  * This function provides all that is necessary to run a RPC server
 952  * inside the samba-dcerpcd framework. Just pass argv and argc on to
 953  * this function.
 954  *
 955  * The get_interfaces() callback provides the information that is
 956  * passed to samba-dcerpcd via --list-interfaces, it should not do any
 957  * real RPC server initialization work. Quickly after this function is
 958  * called by rpc_worker_main, the process exits again. It should
 959  * return the number of interfaces provided.
 960  *
 961  * get_servers() is called when the process is about to do the real
 962  * work. So more heavy-weight initialization should happen here. It
 963  * should return NT_STATUS_OK and the number of server implementations provided.
 964  *
 965  * @param[in] argc argc from main()
 966  * @param[in] argv argv from main()
 967  * @param[in] get_interfaces List all interfaces that this server provides
 968  * @param[in] get_servers Provide the RPC server implementations
 969  * @param[in] private_data Passed to the callback functions
 970  * @return 0 It should never return except on successful process exit
 971  */
 972
 973 int rpc_worker_main(
 974         int argc,
 975         const char *argv[],
 976         const char *daemon_config_name,
 977         int num_workers,
 978         int idle_seconds,
 979         size_t (*get_interfaces)(
 980                 const struct ndr_interface_table ***ifaces,
 981                 void *private_data),
 982         NTSTATUS (*get_servers)(
 983                 struct dcesrv_context *dce_ctx,
 984                 const struct dcesrv_endpoint_server ***ep_servers,
 985                 size_t *num_ep_servers,
 986                 void *private_data),
 987         void *private_data)
 988 {
 989         const struct loadparm_substitution *lp_sub =
 990                 loadparm_s3_global_substitution();
 991         const char *progname = getprogname();
 992         TALLOC_CTX *frame = NULL;
 993         struct tevent_context *ev_ctx = NULL;
 994         struct tevent_req *req = NULL;
 995         struct messaging_context *msg_ctx = NULL;
 996         struct dcesrv_context *dce_ctx = NULL;
 997         struct tevent_signal *se = NULL;
 998         poptContext pc;
 999         int opt;
1000         NTSTATUS status;
1001         int ret;
1002         int worker_group = -1;
1003         int worker_index = -1;
1004         bool log_stdout;
1005         int list_interfaces = 0;
1006         struct rpc_worker *worker = NULL;
1007         const struct dcesrv_endpoint_server **ep_servers;
1008         size_t i, num_servers;
1009         bool ok;
1010
1011         struct poptOption long_options[] = {
1012                 POPT_AUTOHELP
1013                 {
1014                         .longName   = "list-interfaces",
1015                         .argInfo    = POPT_ARG_NONE,
1016                         .arg        = &list_interfaces,
1017                         .descrip    = "List the interfaces provided",
1018                 },
1019                 {
1020                         .longName   = "worker-group",
1021                         .argInfo    = POPT_ARG_INT,
1022                         .arg        = &worker_group,
1023                         .descrip    = "Group index in status message",
1024                 },
1025                 {
1026                         .longName   = "worker-index",
1027                         .argInfo    = POPT_ARG_INT,
1028                         .arg        = &worker_index,
1029                         .descrip    = "Worker index in status message",
1030                 },
1031                 POPT_COMMON_SAMBA
1032                 POPT_TABLEEND
1033         };
1034         static const struct smbd_shim smbd_shim_fns = {
1035                 .become_authenticated_pipe_user =
1036                 smbd_become_authenticated_pipe_user,
1037                 .unbecome_authenticated_pipe_user =
1038                 smbd_unbecome_authenticated_pipe_user,
1039                 .become_root = smbd_become_root,
1040                 .unbecome_root = smbd_unbecome_root,
1041         };
1042
1043         closefrom(3);
1044         talloc_enable_null_tracking();
1045         frame = talloc_stackframe();
1046         umask(0);
1047         smb_init_locale();
1048
1049         ok = samba_cmdline_init(frame,
1050                                 SAMBA_CMDLINE_CONFIG_SERVER,
1051                                 true /* require_smbconf */);
1052         if (!ok) {
1053                 DBG_ERR("Failed to init cmdline parser!\n");
1054                 TALLOC_FREE(frame);
1055                 exit(ENOMEM);
1056         }
1057
1058         pc = samba_popt_get_context(progname, argc, argv, long_options, 0);
1059         if (pc == NULL) {
1060                 DBG_ERR("Failed to setup popt context!\n");
1061                 TALLOC_FREE(frame);
1062                 exit(1);
1063         }
1064
1065         while ((opt = poptGetNextOpt(pc)) != -1) {
1066                 d_fprintf(stderr,
1067                           "\nInvalid option %s: %s\n\n",
1068                           poptBadOption(pc, 0),
1069                           poptStrerror(opt));
1070                 poptPrintUsage(pc, stderr, 0);
1071                 TALLOC_FREE(frame);
1072                 exit(1);
1073         };
1074         poptFreeContext(pc);
1075
1076         if (list_interfaces != 0) {
1077                 const struct ndr_interface_table **ifaces = NULL;
1078                 size_t num_ifaces;
1079
1080                 num_workers = lp_parm_int(
1081                         -1, daemon_config_name, "num_workers", num_workers);
1082                 idle_seconds = lp_parm_int(
1083                         -1, daemon_config_name, "idle_seconds", idle_seconds);
1084
1085                 DBG_DEBUG("daemon=%s, num_workers=%d, idle_seconds=%d\n",
1086                           daemon_config_name,
1087                           num_workers,
1088                           idle_seconds);
1089
1090                 fprintf(stdout, "%d\n%d\n", num_workers, idle_seconds);
1091
1092                 num_ifaces = get_interfaces(&ifaces, private_data);
1093
1094                 for (i=0; i<num_ifaces; i++) {
1095                         rpc_worker_print_interface(stdout, ifaces[i]);
1096                 }
1097
1098                 TALLOC_FREE(frame);
1099                 exit(0);
1100         }
1101
1102         log_stdout = (debug_get_log_type() == DEBUG_STDOUT);
1103         if (log_stdout != 0) {
1104                 setup_logging(argv[0], DEBUG_STDOUT);
1105         } else {
1106                 setup_logging(argv[0], DEBUG_FILE);
1107         }
1108
1109         set_smbd_shim(&smbd_shim_fns);
1110
1111         dump_core_setup(progname, lp_logfile(talloc_tos(), lp_sub));
1112
1113         /* POSIX demands that signals are inherited. If the invoking
1114          * process has these signals masked, we will have problems, as
1115          * we won't receive them. */
1116         BlockSignals(False, SIGHUP);
1117         BlockSignals(False, SIGUSR1);
1118         BlockSignals(False, SIGTERM);
1119
1120 #if defined(SIGFPE)
1121         /* we are never interested in SIGFPE */
1122         BlockSignals(True,SIGFPE);
1123 #endif
1124         /* We no longer use USR2... */
1125 #if defined(SIGUSR2)
1126         BlockSignals(True, SIGUSR2);
1127 #endif
1128         /* Ignore children - no zombies. */
1129         CatchChild();
1130
1131         reopen_logs();
1132
1133         DEBUG(0, ("%s version %s started.\n",
1134                   progname,
1135                   samba_version_string()));
1136         DEBUGADD(0,("%s\n", COPYRIGHT_STARTUP_MESSAGE));
1137
1138         msg_ctx = global_messaging_context();
1139         if (msg_ctx == NULL) {
1140                 DBG_ERR("global_messaging_context() failed\n");
1141                 TALLOC_FREE(frame);
1142                 exit(1);
1143         }
1144         ev_ctx = messaging_tevent_context(msg_ctx);
1145
1146         worker = rpc_worker_new(ev_ctx, msg_ctx);
1147         if (worker == NULL) {
1148                 DBG_ERR("rpc_worker_new failed\n");
1149                 global_messaging_context_free();
1150                 TALLOC_FREE(frame);
1151                 exit(1);
1152         }
1153         dce_ctx = rpc_worker_dce_ctx(worker);
1154
1155         se = tevent_add_signal(
1156                 ev_ctx, ev_ctx, SIGTERM, 0, sig_term_handler, NULL);
1157         if (se == NULL) {
1158                 DBG_ERR("tevent_add_signal failed\n");
1159                 global_messaging_context_free();
1160                 TALLOC_FREE(frame);
1161                 exit(1);
1162         }
1163         BlockSignals(false, SIGTERM);
1164
1165         se = tevent_add_signal(
1166                 ev_ctx, ev_ctx, SIGHUP, 0, sig_hup_handler, NULL);
1167         if (se == NULL) {
1168                 DBG_ERR("tevent_add_signal failed\n");
1169                 global_messaging_context_free();
1170                 TALLOC_FREE(frame);
1171                 exit(1);
1172         }
1173         BlockSignals(false, SIGHUP);
1174
1175         (void)winbind_off();
1176         ok = init_guest_session_info(NULL);
1177         (void)winbind_on();
1178         if (!ok) {
1179                 DBG_WARNING("init_guest_session_info failed\n");
1180                 global_messaging_context_free();
1181                 TALLOC_FREE(frame);
1182                 exit(1);
1183         }
1184
1185         status = init_system_session_info(NULL);
1186         if (!NT_STATUS_IS_OK(status)) {
1187                 DBG_WARNING("init_system_session_info failed: %s\n",
1188                             nt_errstr(status));
1189                 global_messaging_context_free();
1190                 TALLOC_FREE(frame);
1191                 exit(1);
1192         }
1193
1194         DBG_INFO("Initializing DCE/RPC registered endpoint servers\n");
1195
1196         status = get_servers(dce_ctx,
1197                              &ep_servers,
1198                              &num_servers,
1199                              private_data);
1200         if (!NT_STATUS_IS_OK(status)) {
1201                 DBG_ERR("get_servers failed: %s\n", nt_errstr(status));
1202                 global_messaging_context_free();
1203                 TALLOC_FREE(frame);
1204                 exit(1);
1205         }
1206
1207         DBG_DEBUG("get_servers() returned %zu servers\n", num_servers);
1208
1209         for (i=0; i<num_servers; i++) {
1210                 status = register_ep_server(dce_ctx, ep_servers[i]);
1211                 if (!NT_STATUS_IS_OK(status)) {
1212                         DBG_ERR("register_ep_server failed: %s\n",
1213                                 nt_errstr(status));
1214                         global_messaging_context_free();
1215                         TALLOC_FREE(frame);
1216                         exit(1);
1217                 }
1218         }
1219
1220         req = rpc_worker_send(
1221                 ev_ctx, ev_ctx, worker, getppid(), worker_group, worker_index);
1222         if (req == NULL) {
1223                 DBG_ERR("rpc_worker_send failed\n");
1224                 global_messaging_context_free();
1225                 TALLOC_FREE(frame);
1226                 exit(1);
1227         }
1228
1229         DBG_DEBUG("%s worker running\n", progname);
1230
1231         while (tevent_req_is_in_progress(req)) {
1232                 TALLOC_CTX *loop_frame = NULL;
1233
1234                 loop_frame = talloc_stackframe();
1235
1236                 ret = tevent_loop_once(ev_ctx);
1237
1238                 TALLOC_FREE(loop_frame);
1239
1240                 if (ret != 0) {
1241                         DBG_WARNING("tevent_req_once() failed: %s\n",
1242                                     strerror(errno));
1243                         global_messaging_context_free();
1244                         TALLOC_FREE(frame);
1245                         exit(1);
1246                 }
1247         }
1248
1249         status = dcesrv_shutdown_registered_ep_servers(dce_ctx);
1250         if (!NT_STATUS_IS_OK(status)) {
1251                 DBG_DEBUG("Shutdown failed with: %s\n",
1252                         nt_errstr(status));
1253         }
1254
1255         ret = rpc_worker_recv(req);
1256         if (ret != 0) {
1257                 DBG_DEBUG("rpc_worker_recv returned %s\n", strerror(ret));
1258                 global_messaging_context_free();
1259                 TALLOC_FREE(frame);
1260                 exit(1);
1261         }
1262
1263         TALLOC_FREE(frame);
1264         return 0;
1265 }