source3/winbindd/winbindd_dual.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3
   4    Winbind child daemons
   5
   6    Copyright (C) Andrew Tridgell 2002
   7    Copyright (C) Volker Lendecke 2004,2005
   8
   9    This program is free software; you can redistribute it and/or modify
  10    it under the terms of the GNU General Public License as published by
  11    the Free Software Foundation; either version 3 of the License, or
  12    (at your option) any later version.
  13
  14    This program is distributed in the hope that it will be useful,
  15    but WITHOUT ANY WARRANTY; without even the implied warranty of
  16    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17    GNU General Public License for more details.
  18
  19    You should have received a copy of the GNU General Public License
  20    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  21 */
  22
  23 /*
  24  * We fork a child per domain to be able to act non-blocking in the main
  25  * winbind daemon. A domain controller thousands of miles away being being
  26  * slow replying with a 10.000 user list should not hold up netlogon calls
  27  * that can be handled locally.
  28  */
  29
  30 #include "includes.h"
  31 #include "winbindd.h"
  32 #include "rpc_client/rpc_client.h"
  33 #include "nsswitch/wb_reqtrans.h"
  34 #include "secrets.h"
  35 #include "../lib/util/select.h"
  36 #include "../libcli/security/security.h"
  37 #include "system/select.h"
  38 #include "messages.h"
  39 #include "../lib/util/tevent_unix.h"
  40 #include "lib/param/loadparm.h"
  41 #include "lib/util/sys_rw.h"
  42 #include "lib/util/sys_rw_data.h"
  43
  44 #undef DBGC_CLASS
  45 #define DBGC_CLASS DBGC_WINBIND
  46
  47 extern bool override_logfile;
  48
  49 static struct winbindd_child *winbindd_children = NULL;
  50
  51 /* Read some data from a client connection */
  52
  53 static NTSTATUS child_read_request(int sock, struct winbindd_request *wreq)
  54 {
  55         NTSTATUS status;
  56
  57         status = read_data_ntstatus(sock, (char *)wreq, sizeof(*wreq));
  58         if (!NT_STATUS_IS_OK(status)) {
  59                 DEBUG(3, ("child_read_request: read_data failed: %s\n",
  60                           nt_errstr(status)));
  61                 return status;
  62         }
  63
  64         if (wreq->extra_len == 0) {
  65                 wreq->extra_data.data = NULL;
  66                 return NT_STATUS_OK;
  67         }
  68
  69         DEBUG(10, ("Need to read %d extra bytes\n", (int)wreq->extra_len));
  70
  71         wreq->extra_data.data = SMB_MALLOC_ARRAY(char, wreq->extra_len + 1);
  72         if (wreq->extra_data.data == NULL) {
  73                 DEBUG(0, ("malloc failed\n"));
  74                 return NT_STATUS_NO_MEMORY;
  75         }
  76
  77         /* Ensure null termination */
  78         wreq->extra_data.data[wreq->extra_len] = '\0';
  79
  80         status = read_data_ntstatus(sock, wreq->extra_data.data,
  81                                     wreq->extra_len);
  82         if (!NT_STATUS_IS_OK(status)) {
  83                 DEBUG(0, ("Could not read extra data: %s\n",
  84                           nt_errstr(status)));
  85         }
  86         return status;
  87 }
  88
  89 static NTSTATUS child_write_response(int sock, struct winbindd_response *wrsp)
  90 {
  91         struct iovec iov[2];
  92         int iov_count;
  93
  94         iov[0].iov_base = (void *)wrsp;
  95         iov[0].iov_len = sizeof(struct winbindd_response);
  96         iov_count = 1;
  97
  98         if (wrsp->length > sizeof(struct winbindd_response)) {
  99                 iov[1].iov_base = (void *)wrsp->extra_data.data;
 100                 iov[1].iov_len = wrsp->length-iov[0].iov_len;
 101                 iov_count = 2;
 102         }
 103
 104         DEBUG(10, ("Writing %d bytes to parent\n", (int)wrsp->length));
 105
 106         if (write_data_iov(sock, iov, iov_count) != wrsp->length) {
 107                 DEBUG(0, ("Could not write result\n"));
 108                 return NT_STATUS_INVALID_HANDLE;
 109         }
 110
 111         return NT_STATUS_OK;
 112 }
 113
 114 /*
 115  * Do winbind child async request. This is not simply wb_simple_trans. We have
 116  * to do the queueing ourselves because while a request is queued, the child
 117  * might have crashed, and we have to re-fork it in the _trigger function.
 118  */
 119
 120 struct wb_child_request_state {
 121         struct tevent_context *ev;
 122         struct tevent_req *subreq;
 123         struct winbindd_child *child;
 124         struct winbindd_request *request;
 125         struct winbindd_response *response;
 126 };
 127
 128 static bool fork_domain_child(struct winbindd_child *child);
 129
 130 static void wb_child_request_trigger(struct tevent_req *req,
 131                                             void *private_data);
 132 static void wb_child_request_done(struct tevent_req *subreq);
 133
 134 static void wb_child_request_cleanup(struct tevent_req *req,
 135                                      enum tevent_req_state req_state);
 136
 137 struct tevent_req *wb_child_request_send(TALLOC_CTX *mem_ctx,
 138                                          struct tevent_context *ev,
 139                                          struct winbindd_child *child,
 140                                          struct winbindd_request *request)
 141 {
 142         struct tevent_req *req;
 143         struct wb_child_request_state *state;
 144
 145         req = tevent_req_create(mem_ctx, &state,
 146                                 struct wb_child_request_state);
 147         if (req == NULL) {
 148                 return NULL;
 149         }
 150
 151         state->ev = ev;
 152         state->child = child;
 153         state->request = request;
 154
 155         if (!tevent_queue_add(child->queue, ev, req,
 156                               wb_child_request_trigger, NULL)) {
 157                 tevent_req_oom(req);
 158                 return tevent_req_post(req, ev);
 159         }
 160
 161         tevent_req_set_cleanup_fn(req, wb_child_request_cleanup);
 162
 163         return req;
 164 }
 165
 166 static void wb_child_request_trigger(struct tevent_req *req,
 167                                      void *private_data)
 168 {
 169         struct wb_child_request_state *state = tevent_req_data(
 170                 req, struct wb_child_request_state);
 171         struct tevent_req *subreq;
 172
 173         if ((state->child->sock == -1) && (!fork_domain_child(state->child))) {
 174                 tevent_req_error(req, errno);
 175                 return;
 176         }
 177
 178         subreq = wb_simple_trans_send(state, server_event_context(), NULL,
 179                                       state->child->sock, state->request);
 180         if (tevent_req_nomem(subreq, req)) {
 181                 return;
 182         }
 183
 184         state->subreq = subreq;
 185         tevent_req_set_callback(subreq, wb_child_request_done, req);
 186         tevent_req_set_endtime(req, state->ev, timeval_current_ofs(300, 0));
 187 }
 188
 189 static void wb_child_request_done(struct tevent_req *subreq)
 190 {
 191         struct tevent_req *req = tevent_req_callback_data(
 192                 subreq, struct tevent_req);
 193         struct wb_child_request_state *state = tevent_req_data(
 194                 req, struct wb_child_request_state);
 195         int ret, err;
 196
 197         ret = wb_simple_trans_recv(subreq, state, &state->response, &err);
 198         /* Freeing the subrequest is deferred until the cleanup function,
 199          * which has to know whether a subrequest exists, and consequently
 200          * decide whether to shut down the pipe to the child process.
 201          */
 202         if (ret == -1) {
 203                 tevent_req_error(req, err);
 204                 return;
 205         }
 206         tevent_req_done(req);
 207 }
 208
 209 int wb_child_request_recv(struct tevent_req *req, TALLOC_CTX *mem_ctx,
 210                           struct winbindd_response **presponse, int *err)
 211 {
 212         struct wb_child_request_state *state = tevent_req_data(
 213                 req, struct wb_child_request_state);
 214
 215         if (tevent_req_is_unix_error(req, err)) {
 216                 return -1;
 217         }
 218         *presponse = talloc_move(mem_ctx, &state->response);
 219         return 0;
 220 }
 221
 222 static void wb_child_request_cleanup(struct tevent_req *req,
 223                                      enum tevent_req_state req_state)
 224 {
 225         struct wb_child_request_state *state =
 226             tevent_req_data(req, struct wb_child_request_state);
 227
 228         if (state->subreq == NULL) {
 229                 /* nothing to cleanup */
 230                 return;
 231         }
 232
 233         TALLOC_FREE(state->subreq);
 234
 235         if (req_state == TEVENT_REQ_DONE) {
 236                 /* transmitted request and got response */
 237                 return;
 238         }
 239
 240         /*
 241          * Failed to transmit and receive response, or request
 242          * cancelled while being serviced.
 243          * The basic parent/child communication broke, close
 244          * our socket
 245          */
 246         close(state->child->sock);
 247         state->child->sock = -1;
 248         DLIST_REMOVE(winbindd_children, state->child);
 249 }
 250
 251 static bool winbindd_child_busy(struct winbindd_child *child)
 252 {
 253         return tevent_queue_length(child->queue) > 0;
 254 }
 255
 256 static struct winbindd_child *find_idle_child(struct winbindd_domain *domain)
 257 {
 258         int i;
 259
 260         for (i=0; i<lp_winbind_max_domain_connections(); i++) {
 261                 if (!winbindd_child_busy(&domain->children[i])) {
 262                         return &domain->children[i];
 263                 }
 264         }
 265
 266         return NULL;
 267 }
 268
 269 struct winbindd_child *choose_domain_child(struct winbindd_domain *domain)
 270 {
 271         struct winbindd_child *result;
 272
 273         result = find_idle_child(domain);
 274         if (result != NULL) {
 275                 return result;
 276         }
 277         return &domain->children[rand() % lp_winbind_max_domain_connections()];
 278 }
 279
 280 struct dcerpc_binding_handle *dom_child_handle(struct winbindd_domain *domain)
 281 {
 282         struct winbindd_child *child;
 283
 284         child = choose_domain_child(domain);
 285         return child->binding_handle;
 286 }
 287
 288 struct wb_domain_request_state {
 289         struct tevent_context *ev;
 290         struct winbindd_domain *domain;
 291         struct winbindd_child *child;
 292         struct winbindd_request *request;
 293         struct winbindd_request *init_req;
 294         struct winbindd_response *response;
 295 };
 296
 297 static void wb_domain_request_gotdc(struct tevent_req *subreq);
 298 static void wb_domain_request_initialized(struct tevent_req *subreq);
 299 static void wb_domain_request_done(struct tevent_req *subreq);
 300
 301 struct tevent_req *wb_domain_request_send(TALLOC_CTX *mem_ctx,
 302                                           struct tevent_context *ev,
 303                                           struct winbindd_domain *domain,
 304                                           struct winbindd_request *request)
 305 {
 306         struct tevent_req *req, *subreq;
 307         struct wb_domain_request_state *state;
 308
 309         req = tevent_req_create(mem_ctx, &state,
 310                                 struct wb_domain_request_state);
 311         if (req == NULL) {
 312                 return NULL;
 313         }
 314
 315         state->child = choose_domain_child(domain);
 316
 317         if (domain->initialized) {
 318                 subreq = wb_child_request_send(state, ev, state->child,
 319                                                request);
 320                 if (tevent_req_nomem(subreq, req)) {
 321                         return tevent_req_post(req, ev);
 322                 }
 323                 tevent_req_set_callback(subreq, wb_domain_request_done, req);
 324                 return req;
 325         }
 326
 327         state->domain = domain;
 328         state->ev = ev;
 329         state->request = request;
 330
 331         state->init_req = talloc_zero(state, struct winbindd_request);
 332         if (tevent_req_nomem(state->init_req, req)) {
 333                 return tevent_req_post(req, ev);
 334         }
 335
 336         if (IS_DC || domain->primary || domain->internal) {
 337                 /* The primary domain has to find the DC name itself */
 338                 state->init_req->cmd = WINBINDD_INIT_CONNECTION;
 339                 fstrcpy(state->init_req->domain_name, domain->name);
 340                 state->init_req->data.init_conn.is_primary = domain->primary;
 341                 fstrcpy(state->init_req->data.init_conn.dcname, "");
 342
 343                 subreq = wb_child_request_send(state, ev, state->child,
 344                                                state->init_req);
 345                 if (tevent_req_nomem(subreq, req)) {
 346                         return tevent_req_post(req, ev);
 347                 }
 348                 tevent_req_set_callback(subreq, wb_domain_request_initialized,
 349                                         req);
 350                 return req;
 351         }
 352
 353         /*
 354          * Ask our DC for a DC name
 355          */
 356         domain = find_our_domain();
 357
 358         /* This is *not* the primary domain, let's ask our DC about a DC
 359          * name */
 360
 361         state->init_req->cmd = WINBINDD_GETDCNAME;
 362         fstrcpy(state->init_req->domain_name, domain->name);
 363
 364         subreq = wb_child_request_send(state, ev, state->child, request);
 365         if (tevent_req_nomem(subreq, req)) {
 366                 return tevent_req_post(req, ev);
 367         }
 368         tevent_req_set_callback(subreq, wb_domain_request_gotdc, req);
 369         return req;
 370 }
 371
 372 static void wb_domain_request_gotdc(struct tevent_req *subreq)
 373 {
 374         struct tevent_req *req = tevent_req_callback_data(
 375                 subreq, struct tevent_req);
 376         struct wb_domain_request_state *state = tevent_req_data(
 377                 req, struct wb_domain_request_state);
 378         struct winbindd_response *response;
 379         int ret, err;
 380
 381         ret = wb_child_request_recv(subreq, talloc_tos(), &response, &err);
 382         TALLOC_FREE(subreq);
 383         if (ret == -1) {
 384                 tevent_req_error(req, err);
 385                 return;
 386         }
 387         state->init_req->cmd = WINBINDD_INIT_CONNECTION;
 388         fstrcpy(state->init_req->domain_name, state->domain->name);
 389         state->init_req->data.init_conn.is_primary = False;
 390         fstrcpy(state->init_req->data.init_conn.dcname,
 391                 response->data.dc_name);
 392
 393         TALLOC_FREE(response);
 394
 395         subreq = wb_child_request_send(state, state->ev, state->child,
 396                                        state->init_req);
 397         if (tevent_req_nomem(subreq, req)) {
 398                 return;
 399         }
 400         tevent_req_set_callback(subreq, wb_domain_request_initialized, req);
 401 }
 402
 403 static void wb_domain_request_initialized(struct tevent_req *subreq)
 404 {
 405         struct tevent_req *req = tevent_req_callback_data(
 406                 subreq, struct tevent_req);
 407         struct wb_domain_request_state *state = tevent_req_data(
 408                 req, struct wb_domain_request_state);
 409         struct winbindd_response *response;
 410         int ret, err;
 411
 412         ret = wb_child_request_recv(subreq, talloc_tos(), &response, &err);
 413         TALLOC_FREE(subreq);
 414         if (ret == -1) {
 415                 tevent_req_error(req, err);
 416                 return;
 417         }
 418
 419         if (!string_to_sid(&state->domain->sid,
 420                            response->data.domain_info.sid)) {
 421                 DEBUG(1,("init_child_recv: Could not convert sid %s "
 422                         "from string\n", response->data.domain_info.sid));
 423                 tevent_req_error(req, EINVAL);
 424                 return;
 425         }
 426
 427         talloc_free(state->domain->name);
 428         state->domain->name = talloc_strdup(state->domain,
 429                                             response->data.domain_info.name);
 430         if (state->domain->name == NULL) {
 431                 tevent_req_error(req, ENOMEM);
 432                 return;
 433         }
 434
 435         if (response->data.domain_info.alt_name[0] != '\0') {
 436                 talloc_free(state->domain->alt_name);
 437
 438                 state->domain->alt_name = talloc_strdup(state->domain,
 439                                 response->data.domain_info.alt_name);
 440                 if (state->domain->alt_name == NULL) {
 441                         tevent_req_error(req, ENOMEM);
 442                         return;
 443                 }
 444         }
 445
 446         state->domain->native_mode = response->data.domain_info.native_mode;
 447         state->domain->active_directory =
 448                 response->data.domain_info.active_directory;
 449         state->domain->initialized = true;
 450
 451         TALLOC_FREE(response);
 452
 453         subreq = wb_child_request_send(state, state->ev, state->child,
 454                                        state->request);
 455         if (tevent_req_nomem(subreq, req)) {
 456                 return;
 457         }
 458         tevent_req_set_callback(subreq, wb_domain_request_done, req);
 459 }
 460
 461 static void wb_domain_request_done(struct tevent_req *subreq)
 462 {
 463         struct tevent_req *req = tevent_req_callback_data(
 464                 subreq, struct tevent_req);
 465         struct wb_domain_request_state *state = tevent_req_data(
 466                 req, struct wb_domain_request_state);
 467         int ret, err;
 468
 469         ret = wb_child_request_recv(subreq, talloc_tos(), &state->response,
 470                                     &err);
 471         TALLOC_FREE(subreq);
 472         if (ret == -1) {
 473                 tevent_req_error(req, err);
 474                 return;
 475         }
 476         tevent_req_done(req);
 477 }
 478
 479 int wb_domain_request_recv(struct tevent_req *req, TALLOC_CTX *mem_ctx,
 480                            struct winbindd_response **presponse, int *err)
 481 {
 482         struct wb_domain_request_state *state = tevent_req_data(
 483                 req, struct wb_domain_request_state);
 484
 485         if (tevent_req_is_unix_error(req, err)) {
 486                 return -1;
 487         }
 488         *presponse = talloc_move(mem_ctx, &state->response);
 489         return 0;
 490 }
 491
 492 static void child_process_request(struct winbindd_child *child,
 493                                   struct winbindd_cli_state *state)
 494 {
 495         struct winbindd_domain *domain = child->domain;
 496         const struct winbindd_child_dispatch_table *table = child->table;
 497
 498         /* Free response data - we may be interrupted and receive another
 499            command before being able to send this data off. */
 500
 501         state->response->result = WINBINDD_ERROR;
 502         state->response->length = sizeof(struct winbindd_response);
 503
 504         /* as all requests in the child are sync, we can use talloc_tos() */
 505         state->mem_ctx = talloc_tos();
 506
 507         /* Process command */
 508
 509         for (; table->name; table++) {
 510                 if (state->request->cmd == table->struct_cmd) {
 511                         DEBUG(10,("child_process_request: request fn %s\n",
 512                                   table->name));
 513                         state->response->result = table->struct_fn(domain, state);
 514                         return;
 515                 }
 516         }
 517
 518         DEBUG(1, ("child_process_request: unknown request fn number %d\n",
 519                   (int)state->request->cmd));
 520         state->response->result = WINBINDD_ERROR;
 521 }
 522
 523 void setup_child(struct winbindd_domain *domain, struct winbindd_child *child,
 524                  const struct winbindd_child_dispatch_table *table,
 525                  const char *logprefix,
 526                  const char *logname)
 527 {
 528         if (logprefix && logname) {
 529                 char *logbase = NULL;
 530
 531                 if (*lp_logfile(talloc_tos())) {
 532                         char *end = NULL;
 533
 534                         if (asprintf(&logbase, "%s", lp_logfile(talloc_tos())) < 0) {
 535                                 smb_panic("Internal error: asprintf failed");
 536                         }
 537
 538                         if ((end = strrchr_m(logbase, '/'))) {
 539                                 *end = '\0';
 540                         }
 541                 } else {
 542                         if (asprintf(&logbase, "%s", get_dyn_LOGFILEBASE()) < 0) {
 543                                 smb_panic("Internal error: asprintf failed");
 544                         }
 545                 }
 546
 547                 if (asprintf(&child->logfilename, "%s/%s-%s",
 548                              logbase, logprefix, logname) < 0) {
 549                         SAFE_FREE(logbase);
 550                         smb_panic("Internal error: asprintf failed");
 551                 }
 552
 553                 SAFE_FREE(logbase);
 554         } else {
 555                 smb_panic("Internal error: logprefix == NULL && "
 556                           "logname == NULL");
 557         }
 558
 559         child->sock = -1;
 560         child->domain = domain;
 561         child->table = table;
 562         child->queue = tevent_queue_create(NULL, "winbind_child");
 563         SMB_ASSERT(child->queue != NULL);
 564         child->binding_handle = wbint_binding_handle(NULL, domain, child);
 565         SMB_ASSERT(child->binding_handle != NULL);
 566 }
 567
 568 void winbind_child_died(pid_t pid)
 569 {
 570         struct winbindd_child *child;
 571
 572         for (child = winbindd_children; child != NULL; child = child->next) {
 573                 if (child->pid == pid) {
 574                         break;
 575                 }
 576         }
 577
 578         if (child == NULL) {
 579                 DEBUG(5, ("Already reaped child %u died\n", (unsigned int)pid));
 580                 return;
 581         }
 582
 583         /* This will be re-added in fork_domain_child() */
 584
 585         DLIST_REMOVE(winbindd_children, child);
 586         child->pid = 0;
 587
 588         if (child->sock != -1) {
 589                 close(child->sock);
 590                 child->sock = -1;
 591         }
 592 }
 593
 594 /* Ensure any negative cache entries with the netbios or realm names are removed. */
 595
 596 void winbindd_flush_negative_conn_cache(struct winbindd_domain *domain)
 597 {
 598         flush_negative_conn_cache_for_domain(domain->name);
 599         if (domain->alt_name != NULL) {
 600                 flush_negative_conn_cache_for_domain(domain->alt_name);
 601         }
 602 }
 603
 604 /*
 605  * Parent winbindd process sets its own debug level first and then
 606  * sends a message to all the winbindd children to adjust their debug
 607  * level to that of parents.
 608  */
 609
 610 void winbind_msg_debug(struct messaging_context *msg_ctx,
 611                          void *private_data,
 612                          uint32_t msg_type,
 613                          struct server_id server_id,
 614                          DATA_BLOB *data)
 615 {
 616         struct winbindd_child *child;
 617
 618         DEBUG(10,("winbind_msg_debug: got debug message.\n"));
 619
 620         debug_message(msg_ctx, private_data, MSG_DEBUG, server_id, data);
 621
 622         for (child = winbindd_children; child != NULL; child = child->next) {
 623
 624                 DEBUG(10,("winbind_msg_debug: sending message to pid %u.\n",
 625                         (unsigned int)child->pid));
 626
 627                 messaging_send_buf(msg_ctx, pid_to_procid(child->pid),
 628                            MSG_DEBUG,
 629                            data->data,
 630                            strlen((char *) data->data) + 1);
 631         }
 632 }
 633
 634 /* Set our domains as offline and forward the offline message to our children. */
 635
 636 void winbind_msg_offline(struct messaging_context *msg_ctx,
 637                          void *private_data,
 638                          uint32_t msg_type,
 639                          struct server_id server_id,
 640                          DATA_BLOB *data)
 641 {
 642         struct winbindd_child *child;
 643         struct winbindd_domain *domain;
 644
 645         DEBUG(10,("winbind_msg_offline: got offline message.\n"));
 646
 647         if (!lp_winbind_offline_logon()) {
 648                 DEBUG(10,("winbind_msg_offline: rejecting offline message.\n"));
 649                 return;
 650         }
 651
 652         /* Set our global state as offline. */
 653         if (!set_global_winbindd_state_offline()) {
 654                 DEBUG(10,("winbind_msg_offline: offline request failed.\n"));
 655                 return;
 656         }
 657
 658         /* Set all our domains as offline. */
 659         for (domain = domain_list(); domain; domain = domain->next) {
 660                 if (domain->internal) {
 661                         continue;
 662                 }
 663                 DEBUG(5,("winbind_msg_offline: marking %s offline.\n", domain->name));
 664                 set_domain_offline(domain);
 665         }
 666
 667         for (child = winbindd_children; child != NULL; child = child->next) {
 668                 /* Don't send message to internal children.  We've already
 669                    done so above. */
 670                 if (!child->domain || winbindd_internal_child(child)) {
 671                         continue;
 672                 }
 673
 674                 /* Or internal domains (this should not be possible....) */
 675                 if (child->domain->internal) {
 676                         continue;
 677                 }
 678
 679                 /* Each winbindd child should only process requests for one domain - make sure
 680                    we only set it online / offline for that domain. */
 681
 682                 DEBUG(10,("winbind_msg_offline: sending message to pid %u for domain %s.\n",
 683                         (unsigned int)child->pid, child->domain->name ));
 684
 685                 messaging_send_buf(msg_ctx, pid_to_procid(child->pid),
 686                                    MSG_WINBIND_OFFLINE,
 687                                    (const uint8_t *)child->domain->name,
 688                                    strlen(child->domain->name)+1);
 689         }
 690 }
 691
 692 /* Set our domains as online and forward the online message to our children. */
 693
 694 void winbind_msg_online(struct messaging_context *msg_ctx,
 695                         void *private_data,
 696                         uint32_t msg_type,
 697                         struct server_id server_id,
 698                         DATA_BLOB *data)
 699 {
 700         struct winbindd_child *child;
 701         struct winbindd_domain *domain;
 702
 703         DEBUG(10,("winbind_msg_online: got online message.\n"));
 704
 705         if (!lp_winbind_offline_logon()) {
 706                 DEBUG(10,("winbind_msg_online: rejecting online message.\n"));
 707                 return;
 708         }
 709
 710         /* Set our global state as online. */
 711         set_global_winbindd_state_online();
 712
 713         smb_nscd_flush_user_cache();
 714         smb_nscd_flush_group_cache();
 715
 716         /* Set all our domains as online. */
 717         for (domain = domain_list(); domain; domain = domain->next) {
 718                 if (domain->internal) {
 719                         continue;
 720                 }
 721                 DEBUG(5,("winbind_msg_online: requesting %s to go online.\n", domain->name));
 722
 723                 winbindd_flush_negative_conn_cache(domain);
 724                 set_domain_online_request(domain);
 725
 726                 /* Send an online message to the idmap child when our
 727                    primary domain comes back online */
 728
 729                 if ( domain->primary ) {
 730                         struct winbindd_child *idmap = idmap_child();
 731
 732                         if ( idmap->pid != 0 ) {
 733                                 messaging_send_buf(msg_ctx,
 734                                                    pid_to_procid(idmap->pid),
 735                                                    MSG_WINBIND_ONLINE,
 736                                                    (const uint8_t *)domain->name,
 737                                                    strlen(domain->name)+1);
 738                         }
 739                 }
 740         }
 741
 742         for (child = winbindd_children; child != NULL; child = child->next) {
 743                 /* Don't send message to internal childs. */
 744                 if (!child->domain || winbindd_internal_child(child)) {
 745                         continue;
 746                 }
 747
 748                 /* Or internal domains (this should not be possible....) */
 749                 if (child->domain->internal) {
 750                         continue;
 751                 }
 752
 753                 /* Each winbindd child should only process requests for one domain - make sure
 754                    we only set it online / offline for that domain. */
 755
 756                 DEBUG(10,("winbind_msg_online: sending message to pid %u for domain %s.\n",
 757                         (unsigned int)child->pid, child->domain->name ));
 758
 759                 messaging_send_buf(msg_ctx, pid_to_procid(child->pid),
 760                                    MSG_WINBIND_ONLINE,
 761                                    (const uint8_t *)child->domain->name,
 762                                    strlen(child->domain->name)+1);
 763         }
 764 }
 765
 766 static const char *collect_onlinestatus(TALLOC_CTX *mem_ctx)
 767 {
 768         struct winbindd_domain *domain;
 769         char *buf = NULL;
 770
 771         if ((buf = talloc_asprintf(mem_ctx, "global:%s ",
 772                                    get_global_winbindd_state_offline() ?
 773                                    "Offline":"Online")) == NULL) {
 774                 return NULL;
 775         }
 776
 777         for (domain = domain_list(); domain; domain = domain->next) {
 778                 if ((buf = talloc_asprintf_append_buffer(buf, "%s:%s ",
 779                                                   domain->name,
 780                                                   domain->online ?
 781                                                   "Online":"Offline")) == NULL) {
 782                         return NULL;
 783                 }
 784         }
 785
 786         buf = talloc_asprintf_append_buffer(buf, "\n");
 787
 788         DEBUG(5,("collect_onlinestatus: %s", buf));
 789
 790         return buf;
 791 }
 792
 793 void winbind_msg_onlinestatus(struct messaging_context *msg_ctx,
 794                               void *private_data,
 795                               uint32_t msg_type,
 796                               struct server_id server_id,
 797                               DATA_BLOB *data)
 798 {
 799         TALLOC_CTX *mem_ctx;
 800         const char *message;
 801         struct server_id *sender;
 802
 803         DEBUG(5,("winbind_msg_onlinestatus received.\n"));
 804
 805         if (!data->data) {
 806                 return;
 807         }
 808
 809         sender = (struct server_id *)data->data;
 810
 811         mem_ctx = talloc_init("winbind_msg_onlinestatus");
 812         if (mem_ctx == NULL) {
 813                 return;
 814         }
 815
 816         message = collect_onlinestatus(mem_ctx);
 817         if (message == NULL) {
 818                 talloc_destroy(mem_ctx);
 819                 return;
 820         }
 821
 822         messaging_send_buf(msg_ctx, *sender, MSG_WINBIND_ONLINESTATUS,
 823                            (const uint8_t *)message, strlen(message) + 1);
 824
 825         talloc_destroy(mem_ctx);
 826 }
 827
 828 void winbind_msg_dump_event_list(struct messaging_context *msg_ctx,
 829                                  void *private_data,
 830                                  uint32_t msg_type,
 831                                  struct server_id server_id,
 832                                  DATA_BLOB *data)
 833 {
 834         struct winbindd_child *child;
 835
 836         DEBUG(10,("winbind_msg_dump_event_list received\n"));
 837
 838         DBG_WARNING("dump event list no longer implemented\n");
 839
 840         for (child = winbindd_children; child != NULL; child = child->next) {
 841
 842                 DEBUG(10,("winbind_msg_dump_event_list: sending message to pid %u\n",
 843                         (unsigned int)child->pid));
 844
 845                 messaging_send_buf(msg_ctx, pid_to_procid(child->pid),
 846                                    MSG_DUMP_EVENT_LIST,
 847                                    NULL, 0);
 848         }
 849
 850 }
 851
 852 void winbind_msg_dump_domain_list(struct messaging_context *msg_ctx,
 853                                   void *private_data,
 854                                   uint32_t msg_type,
 855                                   struct server_id server_id,
 856                                   DATA_BLOB *data)
 857 {
 858         TALLOC_CTX *mem_ctx;
 859         const char *message = NULL;
 860         struct server_id *sender = NULL;
 861         const char *domain = NULL;
 862         char *s = NULL;
 863         NTSTATUS status;
 864         struct winbindd_domain *dom = NULL;
 865
 866         DEBUG(5,("winbind_msg_dump_domain_list received.\n"));
 867
 868         if (!data || !data->data) {
 869                 return;
 870         }
 871
 872         if (data->length < sizeof(struct server_id)) {
 873                 return;
 874         }
 875
 876         mem_ctx = talloc_init("winbind_msg_dump_domain_list");
 877         if (!mem_ctx) {
 878                 return;
 879         }
 880
 881         sender = (struct server_id *)data->data;
 882         if (data->length > sizeof(struct server_id)) {
 883                 domain = (const char *)data->data+sizeof(struct server_id);
 884         }
 885
 886         if (domain) {
 887
 888                 DEBUG(5,("winbind_msg_dump_domain_list for domain: %s\n",
 889                         domain));
 890
 891                 message = NDR_PRINT_STRUCT_STRING(mem_ctx, winbindd_domain,
 892                                                   find_domain_from_name_noinit(domain));
 893                 if (!message) {
 894                         talloc_destroy(mem_ctx);
 895                         return;
 896                 }
 897
 898                 messaging_send_buf(msg_ctx, *sender,
 899                                    MSG_WINBIND_DUMP_DOMAIN_LIST,
 900                                    (const uint8_t *)message, strlen(message) + 1);
 901
 902                 talloc_destroy(mem_ctx);
 903
 904                 return;
 905         }
 906
 907         DEBUG(5,("winbind_msg_dump_domain_list all domains\n"));
 908
 909         for (dom = domain_list(); dom; dom=dom->next) {
 910                 message = NDR_PRINT_STRUCT_STRING(mem_ctx, winbindd_domain, dom);
 911                 if (!message) {
 912                         talloc_destroy(mem_ctx);
 913                         return;
 914                 }
 915
 916                 s = talloc_asprintf_append(s, "%s\n", message);
 917                 if (!s) {
 918                         talloc_destroy(mem_ctx);
 919                         return;
 920                 }
 921         }
 922
 923         status = messaging_send_buf(msg_ctx, *sender,
 924                                     MSG_WINBIND_DUMP_DOMAIN_LIST,
 925                                     (uint8_t *)s, strlen(s) + 1);
 926         if (!NT_STATUS_IS_OK(status)) {
 927                 DEBUG(0,("failed to send message: %s\n",
 928                 nt_errstr(status)));
 929         }
 930
 931         talloc_destroy(mem_ctx);
 932 }
 933
 934 static void account_lockout_policy_handler(struct tevent_context *ctx,
 935                                            struct tevent_timer *te,
 936                                            struct timeval now,
 937                                            void *private_data)
 938 {
 939         struct winbindd_child *child =
 940                 (struct winbindd_child *)private_data;
 941         TALLOC_CTX *mem_ctx = NULL;
 942         struct samr_DomInfo12 lockout_policy;
 943         NTSTATUS result;
 944
 945         DEBUG(10,("account_lockout_policy_handler called\n"));
 946
 947         TALLOC_FREE(child->lockout_policy_event);
 948
 949         if ( !winbindd_can_contact_domain( child->domain ) ) {
 950                 DEBUG(10,("account_lockout_policy_handler: Removing myself since I "
 951                           "do not have an incoming trust to domain %s\n",
 952                           child->domain->name));
 953
 954                 return;
 955         }
 956
 957         mem_ctx = talloc_init("account_lockout_policy_handler ctx");
 958         if (!mem_ctx) {
 959                 result = NT_STATUS_NO_MEMORY;
 960         } else {
 961                 result = wb_cache_lockout_policy(child->domain, mem_ctx,
 962                                                  &lockout_policy);
 963         }
 964         TALLOC_FREE(mem_ctx);
 965
 966         if (!NT_STATUS_IS_OK(result)) {
 967                 DEBUG(10,("account_lockout_policy_handler: lockout_policy failed error %s\n",
 968                          nt_errstr(result)));
 969         }
 970
 971         child->lockout_policy_event = tevent_add_timer(server_event_context(), NULL,
 972                                                       timeval_current_ofs(3600, 0),
 973                                                       account_lockout_policy_handler,
 974                                                       child);
 975 }
 976
 977 static time_t get_machine_password_timeout(void)
 978 {
 979         /* until we have gpo support use lp setting */
 980         return lp_machine_password_timeout();
 981 }
 982
 983 static bool calculate_next_machine_pwd_change(const char *domain,
 984                                               struct timeval *t)
 985 {
 986         time_t pass_last_set_time;
 987         time_t timeout;
 988         time_t next_change;
 989         struct timeval tv;
 990         char *pw;
 991
 992         pw = secrets_fetch_machine_password(domain,
 993                                             &pass_last_set_time,
 994                                             NULL);
 995
 996         if (pw == NULL) {
 997                 DEBUG(0,("cannot fetch own machine password ????"));
 998                 return false;
 999         }
1000
1001         SAFE_FREE(pw);
1002
1003         timeout = get_machine_password_timeout();
1004         if (timeout == 0) {
1005                 DEBUG(10,("machine password never expires\n"));
1006                 return false;
1007         }
1008
1009         tv.tv_sec = pass_last_set_time;
1010         DEBUG(10, ("password last changed %s\n",
1011                    timeval_string(talloc_tos(), &tv, false)));
1012         tv.tv_sec += timeout;
1013         DEBUGADD(10, ("password valid until %s\n",
1014                       timeval_string(talloc_tos(), &tv, false)));
1015
1016         if (time(NULL) < (pass_last_set_time + timeout)) {
1017                 next_change = pass_last_set_time + timeout;
1018                 DEBUG(10,("machine password still valid until: %s\n",
1019                         http_timestring(talloc_tos(), next_change)));
1020                 *t = timeval_set(next_change, 0);
1021
1022                 if (lp_clustering()) {
1023                         uint8_t randbuf;
1024                         /*
1025                          * When having a cluster, we have several
1026                          * winbinds racing for the password change. In
1027                          * the machine_password_change_handler()
1028                          * function we check if someone else was
1029                          * faster when the event triggers. We add a
1030                          * 255-second random delay here, so that we
1031                          * don't run to change the password at the
1032                          * exact same moment.
1033                          */
1034                         generate_random_buffer(&randbuf, sizeof(randbuf));
1035                         DEBUG(10, ("adding %d seconds randomness\n",
1036                                    (int)randbuf));
1037                         t->tv_sec += randbuf;
1038                 }
1039                 return true;
1040         }
1041
1042         DEBUG(10,("machine password expired, needs immediate change\n"));
1043
1044         *t = timeval_zero();
1045
1046         return true;
1047 }
1048
1049 static void machine_password_change_handler(struct tevent_context *ctx,
1050                                             struct tevent_timer *te,
1051                                             struct timeval now,
1052                                             void *private_data)
1053 {
1054         struct messaging_context *msg_ctx = server_messaging_context();
1055         struct winbindd_child *child =
1056                 (struct winbindd_child *)private_data;
1057         struct rpc_pipe_client *netlogon_pipe = NULL;
1058         NTSTATUS result;
1059         struct timeval next_change;
1060
1061         DEBUG(10,("machine_password_change_handler called\n"));
1062
1063         TALLOC_FREE(child->machine_password_change_event);
1064
1065         if (!calculate_next_machine_pwd_change(child->domain->name,
1066                                                &next_change)) {
1067                 DEBUG(10, ("calculate_next_machine_pwd_change failed\n"));
1068                 return;
1069         }
1070
1071         DEBUG(10, ("calculate_next_machine_pwd_change returned %s\n",
1072                    timeval_string(talloc_tos(), &next_change, false)));
1073
1074         if (!timeval_expired(&next_change)) {
1075                 DEBUG(10, ("Someone else has already changed the pw\n"));
1076                 goto done;
1077         }
1078
1079         if (!winbindd_can_contact_domain(child->domain)) {
1080                 DEBUG(10,("machine_password_change_handler: Removing myself since I "
1081                           "do not have an incoming trust to domain %s\n",
1082                           child->domain->name));
1083                 return;
1084         }
1085
1086         result = cm_connect_netlogon(child->domain, &netlogon_pipe);
1087         if (!NT_STATUS_IS_OK(result)) {
1088                 DEBUG(10,("machine_password_change_handler: "
1089                         "failed to connect netlogon pipe: %s\n",
1090                          nt_errstr(result)));
1091                 return;
1092         }
1093
1094         result = trust_pw_change(child->domain->conn.netlogon_creds_ctx,
1095                                  msg_ctx,
1096                                  netlogon_pipe->binding_handle,
1097                                  child->domain->name,
1098                                  child->domain->dcname,
1099                                  false); /* force */
1100
1101         DEBUG(10, ("machine_password_change_handler: "
1102                    "trust_pw_change returned %s\n",
1103                    nt_errstr(result)));
1104
1105         if (NT_STATUS_EQUAL(result, NT_STATUS_ACCESS_DENIED) ) {
1106                 DEBUG(3,("machine_password_change_handler: password set returned "
1107                          "ACCESS_DENIED.  Maybe the trust account "
1108                          "password was changed and we didn't know it. "
1109                          "Killing connections to domain %s\n",
1110                          child->domain->name));
1111                 invalidate_cm_connection(child->domain);
1112         }
1113
1114         if (!calculate_next_machine_pwd_change(child->domain->name,
1115                                                &next_change)) {
1116                 DEBUG(10, ("calculate_next_machine_pwd_change failed\n"));
1117                 return;
1118         }
1119
1120         DEBUG(10, ("calculate_next_machine_pwd_change returned %s\n",
1121                    timeval_string(talloc_tos(), &next_change, false)));
1122
1123         if (!NT_STATUS_IS_OK(result)) {
1124                 struct timeval tmp;
1125                 /*
1126                  * In case of failure, give the DC a minute to recover
1127                  */
1128                 tmp = timeval_current_ofs(60, 0);
1129                 next_change = timeval_max(&next_change, &tmp);
1130         }
1131
1132 done:
1133         child->machine_password_change_event = tevent_add_timer(server_event_context(), NULL,
1134                                                               next_change,
1135                                                               machine_password_change_handler,
1136                                                               child);
1137 }
1138
1139 /* Deal with a request to go offline. */
1140
1141 static void child_msg_offline(struct messaging_context *msg,
1142                               void *private_data,
1143                               uint32_t msg_type,
1144                               struct server_id server_id,
1145                               DATA_BLOB *data)
1146 {
1147         struct winbindd_domain *domain;
1148         struct winbindd_domain *primary_domain = NULL;
1149         const char *domainname = (const char *)data->data;
1150
1151         if (data->data == NULL || data->length == 0) {
1152                 return;
1153         }
1154
1155         DEBUG(5,("child_msg_offline received for domain %s.\n", domainname));
1156
1157         if (!lp_winbind_offline_logon()) {
1158                 DEBUG(10,("child_msg_offline: rejecting offline message.\n"));
1159                 return;
1160         }
1161
1162         primary_domain = find_our_domain();
1163
1164         /* Mark the requested domain offline. */
1165
1166         for (domain = domain_list(); domain; domain = domain->next) {
1167                 if (domain->internal) {
1168                         continue;
1169                 }
1170                 if (strequal(domain->name, domainname)) {
1171                         DEBUG(5,("child_msg_offline: marking %s offline.\n", domain->name));
1172                         set_domain_offline(domain);
1173                         /* we are in the trusted domain, set the primary domain
1174                          * offline too */
1175                         if (domain != primary_domain) {
1176                                 set_domain_offline(primary_domain);
1177                         }
1178                 }
1179         }
1180 }
1181
1182 /* Deal with a request to go online. */
1183
1184 static void child_msg_online(struct messaging_context *msg,
1185                              void *private_data,
1186                              uint32_t msg_type,
1187                              struct server_id server_id,
1188                              DATA_BLOB *data)
1189 {
1190         struct winbindd_domain *domain;
1191         struct winbindd_domain *primary_domain = NULL;
1192         const char *domainname = (const char *)data->data;
1193
1194         if (data->data == NULL || data->length == 0) {
1195                 return;
1196         }
1197
1198         DEBUG(5,("child_msg_online received for domain %s.\n", domainname));
1199
1200         if (!lp_winbind_offline_logon()) {
1201                 DEBUG(10,("child_msg_online: rejecting online message.\n"));
1202                 return;
1203         }
1204
1205         primary_domain = find_our_domain();
1206
1207         /* Set our global state as online. */
1208         set_global_winbindd_state_online();
1209
1210         /* Try and mark everything online - delete any negative cache entries
1211            to force a reconnect now. */
1212
1213         for (domain = domain_list(); domain; domain = domain->next) {
1214                 if (domain->internal) {
1215                         continue;
1216                 }
1217                 if (strequal(domain->name, domainname)) {
1218                         DEBUG(5,("child_msg_online: requesting %s to go online.\n", domain->name));
1219                         winbindd_flush_negative_conn_cache(domain);
1220                         set_domain_online_request(domain);
1221
1222                         /* we can be in trusted domain, which will contact primary domain
1223                          * we have to bring primary domain online in trusted domain process
1224                          * see, winbindd_dual_pam_auth() --> winbindd_dual_pam_auth_samlogon()
1225                          * --> contact_domain = find_our_domain()
1226                          * */
1227                         if (domain != primary_domain) {
1228                                 winbindd_flush_negative_conn_cache(primary_domain);
1229                                 set_domain_online_request(primary_domain);
1230                         }
1231                 }
1232         }
1233 }
1234
1235 static void child_msg_dump_event_list(struct messaging_context *msg,
1236                                       void *private_data,
1237                                       uint32_t msg_type,
1238                                       struct server_id server_id,
1239                                       DATA_BLOB *data)
1240 {
1241         DEBUG(5,("child_msg_dump_event_list received\n"));
1242         DBG_WARNING("dump_event_list no longer implemented\n");
1243 }
1244
1245 NTSTATUS winbindd_reinit_after_fork(const struct winbindd_child *myself,
1246                                     const char *logfilename)
1247 {
1248         struct winbindd_domain *domain;
1249         struct winbindd_child *cl;
1250         NTSTATUS status;
1251
1252         status = reinit_after_fork(
1253                 server_messaging_context(),
1254                 server_event_context(),
1255                 true, NULL);
1256         if (!NT_STATUS_IS_OK(status)) {
1257                 DEBUG(0,("reinit_after_fork() failed\n"));
1258                 return status;
1259         }
1260
1261         close_conns_after_fork();
1262
1263         if (!override_logfile && logfilename) {
1264                 lp_set_logfile(logfilename);
1265                 reopen_logs();
1266         }
1267
1268         if (!winbindd_setup_sig_term_handler(false))
1269                 return NT_STATUS_NO_MEMORY;
1270         if (!winbindd_setup_sig_hup_handler(override_logfile ? NULL :
1271                                             logfilename))
1272                 return NT_STATUS_NO_MEMORY;
1273
1274         /* Stop zombies in children */
1275         CatchChild();
1276
1277         /* Don't handle the same messages as our parent. */
1278         messaging_deregister(server_messaging_context(),
1279                              MSG_SMB_CONF_UPDATED, NULL);
1280         messaging_deregister(server_messaging_context(),
1281                              MSG_SHUTDOWN, NULL);
1282         messaging_deregister(server_messaging_context(),
1283                              MSG_WINBIND_OFFLINE, NULL);
1284         messaging_deregister(server_messaging_context(),
1285                              MSG_WINBIND_ONLINE, NULL);
1286         messaging_deregister(server_messaging_context(),
1287                              MSG_WINBIND_ONLINESTATUS, NULL);
1288         messaging_deregister(server_messaging_context(),
1289                              MSG_DUMP_EVENT_LIST, NULL);
1290         messaging_deregister(server_messaging_context(),
1291                              MSG_WINBIND_DUMP_DOMAIN_LIST, NULL);
1292         messaging_deregister(server_messaging_context(),
1293                              MSG_DEBUG, NULL);
1294
1295         messaging_deregister(server_messaging_context(),
1296                              MSG_WINBIND_DOMAIN_OFFLINE, NULL);
1297         messaging_deregister(server_messaging_context(),
1298                              MSG_WINBIND_DOMAIN_ONLINE, NULL);
1299
1300         /* We have destroyed all events in the winbindd_event_context
1301          * in reinit_after_fork(), so clean out all possible pending
1302          * event pointers. */
1303
1304         /* Deal with check_online_events. */
1305
1306         for (domain = domain_list(); domain; domain = domain->next) {
1307                 TALLOC_FREE(domain->check_online_event);
1308         }
1309
1310         /* Ensure we're not handling a credential cache event inherited
1311          * from our parent. */
1312
1313         ccache_remove_all_after_fork();
1314
1315         /* Destroy all possible events in child list. */
1316         for (cl = winbindd_children; cl != NULL; cl = cl->next) {
1317                 TALLOC_FREE(cl->lockout_policy_event);
1318                 TALLOC_FREE(cl->machine_password_change_event);
1319
1320                 /* Children should never be able to send
1321                  * each other messages, all messages must
1322                  * go through the parent.
1323                  */
1324                 cl->pid = (pid_t)0;
1325
1326                 /*
1327                  * Close service sockets to all other children
1328                  */
1329                 if ((cl != myself) && (cl->sock != -1)) {
1330                         close(cl->sock);
1331                         cl->sock = -1;
1332                 }
1333         }
1334         /*
1335          * This is a little tricky, children must not
1336          * send an MSG_WINBIND_ONLINE message to idmap_child().
1337          * If we are in a child of our primary domain or
1338          * in the process created by fork_child_dc_connect(),
1339          * and the primary domain cannot go online,
1340          * fork_child_dc_connection() sends MSG_WINBIND_ONLINE
1341          * periodically to idmap_child().
1342          *
1343          * The sequence is, fork_child_dc_connect() ---> getdcs() --->
1344          * get_dc_name_via_netlogon() ---> cm_connect_netlogon()
1345          * ---> init_dc_connection() ---> cm_open_connection --->
1346          * set_domain_online(), sends MSG_WINBIND_ONLINE to
1347          * idmap_child(). Disallow children sending messages
1348          * to each other, all messages must go through the parent.
1349          */
1350         cl = idmap_child();
1351         cl->pid = (pid_t)0;
1352
1353         return NT_STATUS_OK;
1354 }
1355
1356 /*
1357  * In a child there will be only one domain, reference that here.
1358  */
1359 static struct winbindd_domain *child_domain;
1360
1361 struct winbindd_domain *wb_child_domain(void)
1362 {
1363         return child_domain;
1364 }
1365
1366 struct child_handler_state {
1367         struct winbindd_child *child;
1368         struct winbindd_cli_state cli;
1369 };
1370
1371 static void child_handler(struct tevent_context *ev, struct tevent_fd *fde,
1372                           uint16_t flags, void *private_data)
1373 {
1374         struct child_handler_state *state =
1375                 (struct child_handler_state *)private_data;
1376         NTSTATUS status;
1377
1378         /* fetch a request from the main daemon */
1379         status = child_read_request(state->cli.sock, state->cli.request);
1380
1381         if (!NT_STATUS_IS_OK(status)) {
1382                 /* we lost contact with our parent */
1383                 _exit(0);
1384         }
1385
1386         DEBUG(4,("child daemon request %d\n",
1387                  (int)state->cli.request->cmd));
1388
1389         ZERO_STRUCTP(state->cli.response);
1390         state->cli.request->null_term = '\0';
1391         state->cli.mem_ctx = talloc_tos();
1392         child_process_request(state->child, &state->cli);
1393
1394         DEBUG(4, ("Finished processing child request %d\n",
1395                   (int)state->cli.request->cmd));
1396
1397         SAFE_FREE(state->cli.request->extra_data.data);
1398
1399         status = child_write_response(state->cli.sock, state->cli.response);
1400         if (!NT_STATUS_IS_OK(status)) {
1401                 exit(1);
1402         }
1403 }
1404
1405 static bool fork_domain_child(struct winbindd_child *child)
1406 {
1407         int fdpair[2];
1408         struct child_handler_state state;
1409         struct winbindd_request request;
1410         struct winbindd_response response;
1411         struct winbindd_domain *primary_domain = NULL;
1412         NTSTATUS status;
1413         ssize_t nwritten;
1414         struct tevent_fd *fde;
1415
1416         if (child->domain) {
1417                 DEBUG(10, ("fork_domain_child called for domain '%s'\n",
1418                            child->domain->name));
1419         } else {
1420                 DEBUG(10, ("fork_domain_child called without domain.\n"));
1421         }
1422
1423         if (socketpair(AF_UNIX, SOCK_STREAM, 0, fdpair) != 0) {
1424                 DEBUG(0, ("Could not open child pipe: %s\n",
1425                           strerror(errno)));
1426                 return False;
1427         }
1428
1429         ZERO_STRUCT(state);
1430         state.child = child;
1431         state.cli.pid = getpid();
1432         state.cli.request = &request;
1433         state.cli.response = &response;
1434
1435         child->pid = fork();
1436
1437         if (child->pid == -1) {
1438                 DEBUG(0, ("Could not fork: %s\n", strerror(errno)));
1439                 close(fdpair[0]);
1440                 close(fdpair[1]);
1441                 return False;
1442         }
1443
1444         if (child->pid != 0) {
1445                 /* Parent */
1446                 ssize_t nread;
1447
1448                 close(fdpair[0]);
1449
1450                 nread = sys_read(fdpair[1], &status, sizeof(status));
1451                 if (nread != sizeof(status)) {
1452                         DEBUG(1, ("fork_domain_child: Could not read child status: "
1453                                   "nread=%d, error=%s\n", (int)nread,
1454                                   strerror(errno)));
1455                         close(fdpair[1]);
1456                         return false;
1457                 }
1458                 if (!NT_STATUS_IS_OK(status)) {
1459                         DEBUG(1, ("fork_domain_child: Child status is %s\n",
1460                                   nt_errstr(status)));
1461                         close(fdpair[1]);
1462                         return false;
1463                 }
1464
1465                 child->next = child->prev = NULL;
1466                 DLIST_ADD(winbindd_children, child);
1467                 child->sock = fdpair[1];
1468                 return True;
1469         }
1470
1471         /* Child */
1472         child_domain = child->domain;
1473
1474         DEBUG(10, ("Child process %d\n", (int)getpid()));
1475
1476         state.cli.sock = fdpair[0];
1477         close(fdpair[1]);
1478
1479         status = winbindd_reinit_after_fork(child, child->logfilename);
1480
1481         nwritten = sys_write(state.cli.sock, &status, sizeof(status));
1482         if (nwritten != sizeof(status)) {
1483                 DEBUG(1, ("fork_domain_child: Could not write status: "
1484                           "nwritten=%d, error=%s\n", (int)nwritten,
1485                           strerror(errno)));
1486                 _exit(0);
1487         }
1488         if (!NT_STATUS_IS_OK(status)) {
1489                 DEBUG(1, ("winbindd_reinit_after_fork failed: %s\n",
1490                           nt_errstr(status)));
1491                 _exit(0);
1492         }
1493
1494         /* Handle online/offline messages. */
1495         messaging_register(server_messaging_context(), NULL,
1496                            MSG_WINBIND_OFFLINE, child_msg_offline);
1497         messaging_register(server_messaging_context(), NULL,
1498                            MSG_WINBIND_ONLINE, child_msg_online);
1499         messaging_register(server_messaging_context(), NULL,
1500                            MSG_DUMP_EVENT_LIST, child_msg_dump_event_list);
1501         messaging_register(server_messaging_context(), NULL,
1502                            MSG_DEBUG, debug_message);
1503         messaging_register(server_messaging_context(), NULL,
1504                            MSG_WINBIND_IP_DROPPED,
1505                            winbind_msg_ip_dropped);
1506
1507
1508         primary_domain = find_our_domain();
1509
1510         if (primary_domain == NULL) {
1511                 smb_panic("no primary domain found");
1512         }
1513
1514         /* It doesn't matter if we allow cache login,
1515          * try to bring domain online after fork. */
1516         if ( child->domain ) {
1517                 child->domain->startup = True;
1518                 child->domain->startup_time = time_mono(NULL);
1519                 /* we can be in primary domain or in trusted domain
1520                  * If we are in trusted domain, set the primary domain
1521                  * in start-up mode */
1522                 if (!(child->domain->internal)) {
1523                         set_domain_online_request(child->domain);
1524                         if (!(child->domain->primary)) {
1525                                 primary_domain->startup = True;
1526                                 primary_domain->startup_time = time_mono(NULL);
1527                                 set_domain_online_request(primary_domain);
1528                         }
1529                 }
1530         }
1531
1532         /*
1533          * We are in idmap child, make sure that we set the
1534          * check_online_event to bring primary domain online.
1535          */
1536         if (child == idmap_child()) {
1537                 set_domain_online_request(primary_domain);
1538         }
1539
1540         /* We might be in the idmap child...*/
1541         if (child->domain && !(child->domain->internal) &&
1542             lp_winbind_offline_logon()) {
1543
1544                 set_domain_online_request(child->domain);
1545
1546                 if (primary_domain && (primary_domain != child->domain)) {
1547                         /* We need to talk to the primary
1548                          * domain as well as the trusted
1549                          * domain inside a trusted domain
1550                          * child.
1551                          * See the code in :
1552                          * set_dc_type_and_flags_trustinfo()
1553                          * for details.
1554                          */
1555                         set_domain_online_request(primary_domain);
1556                 }
1557
1558                 child->lockout_policy_event = tevent_add_timer(
1559                         server_event_context(), NULL, timeval_zero(),
1560                         account_lockout_policy_handler,
1561                         child);
1562         }
1563
1564         if (child->domain && child->domain->primary &&
1565             !USE_KERBEROS_KEYTAB &&
1566             lp_server_role() == ROLE_DOMAIN_MEMBER) {
1567
1568                 struct timeval next_change;
1569
1570                 if (calculate_next_machine_pwd_change(child->domain->name,
1571                                                        &next_change)) {
1572                         child->machine_password_change_event = tevent_add_timer(
1573                                 server_event_context(), NULL, next_change,
1574                                 machine_password_change_handler,
1575                                 child);
1576                 }
1577         }
1578
1579         fde = tevent_add_fd(server_event_context(), NULL, state.cli.sock,
1580                             TEVENT_FD_READ, child_handler, &state);
1581         if (fde == NULL) {
1582                 DEBUG(1, ("tevent_add_fd failed\n"));
1583                 _exit(1);
1584         }
1585
1586         while (1) {
1587
1588                 int ret;
1589                 TALLOC_CTX *frame = talloc_stackframe();
1590
1591                 ret = tevent_loop_once(server_event_context());
1592                 if (ret != 0) {
1593                         DEBUG(1, ("tevent_loop_once failed: %s\n",
1594                                   strerror(errno)));
1595                         _exit(1);
1596                 }
1597
1598                 if (child->domain && child->domain->startup &&
1599                                 (time_mono(NULL) > child->domain->startup_time + 30)) {
1600                         /* No longer in "startup" mode. */
1601                         DEBUG(10,("fork_domain_child: domain %s no longer in 'startup' mode.\n",
1602                                 child->domain->name ));
1603                         child->domain->startup = False;
1604                 }
1605
1606                 TALLOC_FREE(frame);
1607         }
1608 }
1609
1610 void winbind_msg_ip_dropped_parent(struct messaging_context *msg_ctx,
1611                                    void *private_data,
1612                                    uint32_t msg_type,
1613                                    struct server_id server_id,
1614                                    DATA_BLOB *data)
1615 {
1616         struct winbindd_child *child;
1617
1618         winbind_msg_ip_dropped(msg_ctx, private_data, msg_type,
1619                                server_id, data);
1620
1621
1622         for (child = winbindd_children; child != NULL; child = child->next) {
1623                 messaging_send_buf(msg_ctx, pid_to_procid(child->pid),
1624                                    msg_type, data->data, data->length);
1625         }
1626 }