source/nsswitch/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 2 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, write to the Free Software
  21    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  22 */
  23
  24 /*
  25  * We fork a child per domain to be able to act non-blocking in the main
  26  * winbind daemon. A domain controller thousands of miles away being being
  27  * slow replying with a 10.000 user list should not hold up netlogon calls
  28  * that can be handled locally.
  29  */
  30
  31 #include "includes.h"
  32 #include "winbindd.h"
  33
  34 #undef DBGC_CLASS
  35 #define DBGC_CLASS DBGC_WINBIND
  36
  37 extern BOOL override_logfile;
  38
  39 /* Read some data from a client connection */
  40
  41 static void child_read_request(struct winbindd_cli_state *state)
  42 {
  43         ssize_t len;
  44
  45         /* Read data */
  46
  47         len = read_data(state->sock, (char *)&state->request,
  48                         sizeof(state->request));
  49
  50         if (len != sizeof(state->request)) {
  51                 DEBUG(len > 0 ? 0 : 3, ("Got invalid request length: %d\n", (int)len));
  52                 state->finished = True;
  53                 return;
  54         }
  55
  56         if (state->request.extra_len == 0) {
  57                 state->request.extra_data.data = NULL;
  58                 return;
  59         }
  60
  61         DEBUG(10, ("Need to read %d extra bytes\n", (int)state->request.extra_len));
  62
  63         state->request.extra_data.data =
  64                 SMB_MALLOC_ARRAY(char, state->request.extra_len + 1);
  65
  66         if (state->request.extra_data.data == NULL) {
  67                 DEBUG(0, ("malloc failed\n"));
  68                 state->finished = True;
  69                 return;
  70         }
  71
  72         /* Ensure null termination */
  73         state->request.extra_data.data[state->request.extra_len] = '\0';
  74
  75         len = read_data(state->sock, state->request.extra_data.data,
  76                         state->request.extra_len);
  77
  78         if (len != state->request.extra_len) {
  79                 DEBUG(0, ("Could not read extra data\n"));
  80                 state->finished = True;
  81                 return;
  82         }
  83 }
  84
  85 /*
  86  * Machinery for async requests sent to children. You set up a
  87  * winbindd_request, select a child to query, and issue a async_request
  88  * call. When the request is completed, the callback function you specified is
  89  * called back with the private pointer you gave to async_request.
  90  */
  91
  92 struct winbindd_async_request {
  93         struct winbindd_async_request *next, *prev;
  94         TALLOC_CTX *mem_ctx;
  95         struct winbindd_child *child;
  96         struct winbindd_request *request;
  97         struct winbindd_response *response;
  98         void (*continuation)(void *private_data, BOOL success);
  99         struct timed_event *reply_timeout_event;
 100         pid_t child_pid; /* pid of the child we're waiting on. Used to detect
 101                             a restart of the child (child->pid != child_pid). */
 102         void *private_data;
 103 };
 104
 105 static void async_main_request_sent(void *private_data, BOOL success);
 106 static void async_request_sent(void *private_data, BOOL success);
 107 static void async_reply_recv(void *private_data, BOOL success);
 108 static void schedule_async_request(struct winbindd_child *child);
 109
 110 void async_request(TALLOC_CTX *mem_ctx, struct winbindd_child *child,
 111                    struct winbindd_request *request,
 112                    struct winbindd_response *response,
 113                    void (*continuation)(void *private_data, BOOL success),
 114                    void *private_data)
 115 {
 116         struct winbindd_async_request *state;
 117
 118         SMB_ASSERT(continuation != NULL);
 119
 120         state = TALLOC_P(mem_ctx, struct winbindd_async_request);
 121
 122         if (state == NULL) {
 123                 DEBUG(0, ("talloc failed\n"));
 124                 continuation(private_data, False);
 125                 return;
 126         }
 127
 128         state->mem_ctx = mem_ctx;
 129         state->child = child;
 130         state->request = request;
 131         state->response = response;
 132         state->continuation = continuation;
 133         state->private_data = private_data;
 134         state->child_pid = child->pid;
 135
 136         DLIST_ADD_END(child->requests, state, struct winbindd_async_request *);
 137
 138         schedule_async_request(child);
 139
 140         return;
 141 }
 142
 143 static void async_main_request_sent(void *private_data, BOOL success)
 144 {
 145         struct winbindd_async_request *state =
 146                 talloc_get_type_abort(private_data, struct winbindd_async_request);
 147
 148         if (!success) {
 149                 DEBUG(5, ("Could not send async request\n"));
 150
 151                 state->response->length = sizeof(struct winbindd_response);
 152                 state->response->result = WINBINDD_ERROR;
 153                 state->continuation(state->private_data, False);
 154                 return;
 155         }
 156
 157         if (state->request->extra_len == 0) {
 158                 async_request_sent(private_data, True);
 159                 return;
 160         }
 161
 162         setup_async_write(&state->child->event, state->request->extra_data.data,
 163                           state->request->extra_len,
 164                           async_request_sent, state);
 165 }
 166
 167 /****************************************************************
 168  Handler triggered if the child winbindd doesn't respond within
 169  a given timeout.
 170 ****************************************************************/
 171
 172 static void async_request_timeout_handler(struct event_context *ctx,
 173                                         struct timed_event *te,
 174                                         const struct timeval *now,
 175                                         void *private_data)
 176 {
 177         struct winbindd_async_request *state =
 178                 talloc_get_type_abort(private_data, struct winbindd_async_request);
 179
 180         DEBUG(0,("async_request_timeout_handler: child pid %u is not responding. "
 181                 "Closing connection to it.\n",
 182                 state->child_pid ));
 183
 184         /* Deal with the reply - set to error. */
 185         async_reply_recv(private_data, False);
 186 }
 187
 188 /**************************************************************
 189  Common function called on both async send and recv fail.
 190  Cleans up the child and schedules the next request.
 191 **************************************************************/
 192
 193 static void async_request_fail(struct winbindd_async_request *state)
 194 {
 195         DLIST_REMOVE(state->child->requests, state);
 196
 197         TALLOC_FREE(state->reply_timeout_event);
 198
 199         SMB_ASSERT(state->child_pid != (pid_t)0);
 200
 201         /* If not already reaped, send kill signal to child. */
 202         if (state->child->pid == state->child_pid) {
 203                 kill(state->child_pid, SIGTERM);
 204
 205                 /*
 206                  * Close the socket to the child.
 207                  */
 208                 winbind_child_died(state->child_pid);
 209         }
 210
 211         state->response->length = sizeof(struct winbindd_response);
 212         state->response->result = WINBINDD_ERROR;
 213         state->continuation(state->private_data, False);
 214 }
 215
 216 static void async_request_sent(void *private_data_data, BOOL success)
 217 {
 218         struct winbindd_async_request *state =
 219                 talloc_get_type_abort(private_data_data, struct winbindd_async_request);
 220
 221         if (!success) {
 222                 DEBUG(5, ("Could not send async request to child pid %u\n",
 223                         (unsigned int)state->child_pid ));
 224                 async_request_fail(state);
 225                 return;
 226         }
 227
 228         /* Request successfully sent to the child, setup the wait for reply */
 229
 230         setup_async_read(&state->child->event,
 231                          &state->response->result,
 232                          sizeof(state->response->result),
 233                          async_reply_recv, state);
 234
 235         /*
 236          * Set up a timeout of 300 seconds for the response.
 237          * If we don't get it close the child socket and
 238          * report failure.
 239          */
 240
 241         state->reply_timeout_event = event_add_timed(winbind_event_context(),
 242                                                         NULL,
 243                                                         timeval_current_ofs(300,0),
 244                                                         "async_request_timeout",
 245                                                         async_request_timeout_handler,
 246                                                         state);
 247         if (!state->reply_timeout_event) {
 248                 smb_panic("async_request_sent: failed to add timeout handler.\n");
 249         }
 250 }
 251
 252 static void async_reply_recv(void *private_data, BOOL success)
 253 {
 254         struct winbindd_async_request *state =
 255                 talloc_get_type_abort(private_data, struct winbindd_async_request);
 256         struct winbindd_child *child = state->child;
 257
 258         TALLOC_FREE(state->reply_timeout_event);
 259
 260         state->response->length = sizeof(struct winbindd_response);
 261
 262         if (!success) {
 263                 DEBUG(5, ("Could not receive async reply from child pid %u\n",
 264                         (unsigned int)state->child_pid ));
 265
 266                 cache_cleanup_response(state->child_pid);
 267                 async_request_fail(state);
 268                 return;
 269         }
 270
 271         SMB_ASSERT(cache_retrieve_response(state->child_pid,
 272                                            state->response));
 273
 274         cache_cleanup_response(state->child_pid);
 275
 276         DLIST_REMOVE(child->requests, state);
 277
 278         schedule_async_request(child);
 279
 280         state->continuation(state->private_data, True);
 281 }
 282
 283 static BOOL fork_domain_child(struct winbindd_child *child);
 284
 285 static void schedule_async_request(struct winbindd_child *child)
 286 {
 287         struct winbindd_async_request *request = child->requests;
 288
 289         if (request == NULL) {
 290                 return;
 291         }
 292
 293         if (child->event.flags != 0) {
 294                 return;         /* Busy */
 295         }
 296
 297         if ((child->pid == 0) && (!fork_domain_child(child))) {
 298                 /* Cancel all outstanding requests */
 299
 300                 while (request != NULL) {
 301                         /* request might be free'd in the continuation */
 302                         struct winbindd_async_request *next = request->next;
 303                         request->continuation(request->private_data, False);
 304                         request = next;
 305                 }
 306                 return;
 307         }
 308
 309         setup_async_write(&child->event, request->request,
 310                           sizeof(*request->request),
 311                           async_main_request_sent, request);
 312
 313         return;
 314 }
 315
 316 struct domain_request_state {
 317         TALLOC_CTX *mem_ctx;
 318         struct winbindd_domain *domain;
 319         struct winbindd_request *request;
 320         struct winbindd_response *response;
 321         void (*continuation)(void *private_data_data, BOOL success);
 322         void *private_data_data;
 323 };
 324
 325 static void domain_init_recv(void *private_data_data, BOOL success);
 326
 327 void async_domain_request(TALLOC_CTX *mem_ctx,
 328                           struct winbindd_domain *domain,
 329                           struct winbindd_request *request,
 330                           struct winbindd_response *response,
 331                           void (*continuation)(void *private_data_data, BOOL success),
 332                           void *private_data_data)
 333 {
 334         struct domain_request_state *state;
 335
 336         if (domain->initialized) {
 337                 async_request(mem_ctx, &domain->child, request, response,
 338                               continuation, private_data_data);
 339                 return;
 340         }
 341
 342         state = TALLOC_P(mem_ctx, struct domain_request_state);
 343         if (state == NULL) {
 344                 DEBUG(0, ("talloc failed\n"));
 345                 continuation(private_data_data, False);
 346                 return;
 347         }
 348
 349         state->mem_ctx = mem_ctx;
 350         state->domain = domain;
 351         state->request = request;
 352         state->response = response;
 353         state->continuation = continuation;
 354         state->private_data_data = private_data_data;
 355
 356         init_child_connection(domain, domain_init_recv, state);
 357 }
 358
 359 static void recvfrom_child(void *private_data_data, BOOL success)
 360 {
 361         struct winbindd_cli_state *state =
 362                 talloc_get_type_abort(private_data_data, struct winbindd_cli_state);
 363         enum winbindd_result result = state->response.result;
 364
 365         /* This is an optimization: The child has written directly to the
 366          * response buffer. The request itself is still in pending state,
 367          * state that in the result code. */
 368
 369         state->response.result = WINBINDD_PENDING;
 370
 371         if ((!success) || (result != WINBINDD_OK)) {
 372                 request_error(state);
 373                 return;
 374         }
 375
 376         request_ok(state);
 377 }
 378
 379 void sendto_child(struct winbindd_cli_state *state,
 380                   struct winbindd_child *child)
 381 {
 382         async_request(state->mem_ctx, child, &state->request,
 383                       &state->response, recvfrom_child, state);
 384 }
 385
 386 void sendto_domain(struct winbindd_cli_state *state,
 387                    struct winbindd_domain *domain)
 388 {
 389         async_domain_request(state->mem_ctx, domain,
 390                              &state->request, &state->response,
 391                              recvfrom_child, state);
 392 }
 393
 394 static void domain_init_recv(void *private_data_data, BOOL success)
 395 {
 396         struct domain_request_state *state =
 397                 talloc_get_type_abort(private_data_data, struct domain_request_state);
 398
 399         if (!success) {
 400                 DEBUG(5, ("Domain init returned an error\n"));
 401                 state->continuation(state->private_data_data, False);
 402                 return;
 403         }
 404
 405         async_request(state->mem_ctx, &state->domain->child,
 406                       state->request, state->response,
 407                       state->continuation, state->private_data_data);
 408 }
 409
 410 struct winbindd_child_dispatch_table {
 411         enum winbindd_cmd cmd;
 412         enum winbindd_result (*fn)(struct winbindd_domain *domain,
 413                                    struct winbindd_cli_state *state);
 414         const char *winbindd_cmd_name;
 415 };
 416
 417 static struct winbindd_child_dispatch_table child_dispatch_table[] = {
 418
 419         { WINBINDD_LOOKUPSID,            winbindd_dual_lookupsid,             "LOOKUPSID" },
 420         { WINBINDD_LOOKUPNAME,           winbindd_dual_lookupname,            "LOOKUPNAME" },
 421         { WINBINDD_LOOKUPRIDS,           winbindd_dual_lookuprids,            "LOOKUPRIDS" },
 422         { WINBINDD_LIST_TRUSTDOM,        winbindd_dual_list_trusted_domains,  "LIST_TRUSTDOM" },
 423         { WINBINDD_INIT_CONNECTION,      winbindd_dual_init_connection,       "INIT_CONNECTION" },
 424         { WINBINDD_GETDCNAME,            winbindd_dual_getdcname,             "GETDCNAME" },
 425         { WINBINDD_SHOW_SEQUENCE,        winbindd_dual_show_sequence,         "SHOW_SEQUENCE" },
 426         { WINBINDD_PAM_AUTH,             winbindd_dual_pam_auth,              "PAM_AUTH" },
 427         { WINBINDD_PAM_AUTH_CRAP,        winbindd_dual_pam_auth_crap,         "AUTH_CRAP" },
 428         { WINBINDD_PAM_LOGOFF,           winbindd_dual_pam_logoff,            "PAM_LOGOFF" },
 429         { WINBINDD_PAM_CHNG_PSWD_AUTH_CRAP,winbindd_dual_pam_chng_pswd_auth_crap,"CHNG_PSWD_AUTH_CRAP" },
 430         { WINBINDD_PAM_CHAUTHTOK,        winbindd_dual_pam_chauthtok,         "PAM_CHAUTHTOK" },
 431         { WINBINDD_CHECK_MACHACC,        winbindd_dual_check_machine_acct,    "CHECK_MACHACC" },
 432         { WINBINDD_DUAL_SID2UID,         winbindd_dual_sid2uid,               "DUAL_SID2UID" },
 433         { WINBINDD_DUAL_SID2GID,         winbindd_dual_sid2gid,               "DUAL_SID2GID" },
 434 #if 0   /* DISABLED until we fix the interface in Samba 3.0.26 --jerry */
 435         { WINBINDD_DUAL_SIDS2XIDS,       winbindd_dual_sids2xids,             "DUAL_SIDS2XIDS" },
 436 #endif  /* end DISABLED */
 437         { WINBINDD_DUAL_UID2SID,         winbindd_dual_uid2sid,               "DUAL_UID2SID" },
 438         { WINBINDD_DUAL_GID2SID,         winbindd_dual_gid2sid,               "DUAL_GID2SID" },
 439         { WINBINDD_DUAL_UID2NAME,        winbindd_dual_uid2name,              "DUAL_UID2NAME" },
 440         { WINBINDD_DUAL_NAME2UID,        winbindd_dual_name2uid,              "DUAL_NAME2UID" },
 441         { WINBINDD_DUAL_GID2NAME,        winbindd_dual_gid2name,              "DUAL_GID2NAME" },
 442         { WINBINDD_DUAL_NAME2GID,        winbindd_dual_name2gid,              "DUAL_NAME2GID" },
 443         { WINBINDD_DUAL_SET_MAPPING,     winbindd_dual_set_mapping,           "DUAL_SET_MAPPING" },
 444         { WINBINDD_DUAL_SET_HWM,         winbindd_dual_set_hwm,               "DUAL_SET_HWMS" },
 445         { WINBINDD_DUAL_DUMP_MAPS,       winbindd_dual_dump_maps,             "DUAL_DUMP_MAPS" },
 446         { WINBINDD_DUAL_USERINFO,        winbindd_dual_userinfo,              "DUAL_USERINFO" },
 447         { WINBINDD_ALLOCATE_UID,         winbindd_dual_allocate_uid,          "ALLOCATE_UID" },
 448         { WINBINDD_ALLOCATE_GID,         winbindd_dual_allocate_gid,          "ALLOCATE_GID" },
 449         { WINBINDD_GETUSERDOMGROUPS,     winbindd_dual_getuserdomgroups,      "GETUSERDOMGROUPS" },
 450         { WINBINDD_DUAL_GETSIDALIASES,   winbindd_dual_getsidaliases,         "GETSIDALIASES" },
 451         { WINBINDD_CCACHE_NTLMAUTH,      winbindd_dual_ccache_ntlm_auth,      "CCACHE_NTLM_AUTH" },
 452         /* End of list */
 453
 454         { WINBINDD_NUM_CMDS, NULL, "NONE" }
 455 };
 456
 457 static void child_process_request(struct winbindd_domain *domain,
 458                                   struct winbindd_cli_state *state)
 459 {
 460         struct winbindd_child_dispatch_table *table;
 461
 462         /* Free response data - we may be interrupted and receive another
 463            command before being able to send this data off. */
 464
 465         state->response.result = WINBINDD_ERROR;
 466         state->response.length = sizeof(struct winbindd_response);
 467
 468         state->mem_ctx = talloc_init("winbind request");
 469         if (state->mem_ctx == NULL)
 470                 return;
 471
 472         /* Process command */
 473
 474         for (table = child_dispatch_table; table->fn; table++) {
 475                 if (state->request.cmd == table->cmd) {
 476                         DEBUG(10,("process_request: request fn %s\n",
 477                                   table->winbindd_cmd_name ));
 478                         state->response.result = table->fn(domain, state);
 479                         break;
 480                 }
 481         }
 482
 483         if (!table->fn) {
 484                 DEBUG(10,("process_request: unknown request fn number %d\n",
 485                           (int)state->request.cmd ));
 486                 state->response.result = WINBINDD_ERROR;
 487         }
 488
 489         talloc_destroy(state->mem_ctx);
 490 }
 491
 492 void setup_domain_child(struct winbindd_domain *domain,
 493                         struct winbindd_child *child,
 494                         const char *explicit_logfile)
 495 {
 496         if (explicit_logfile != NULL) {
 497                 pstr_sprintf(child->logfilename, "%s/log.winbindd-%s",
 498                              dyn_LOGFILEBASE, explicit_logfile);
 499         } else if (domain != NULL) {
 500                 pstr_sprintf(child->logfilename, "%s/log.wb-%s",
 501                              dyn_LOGFILEBASE, domain->name);
 502         } else {
 503                 smb_panic("Internal error: domain == NULL && "
 504                           "explicit_logfile == NULL");
 505         }
 506
 507         child->domain = domain;
 508 }
 509
 510 struct winbindd_child *children = NULL;
 511
 512 void winbind_child_died(pid_t pid)
 513 {
 514         struct winbindd_child *child;
 515
 516         for (child = children; child != NULL; child = child->next) {
 517                 if (child->pid == pid) {
 518                         break;
 519                 }
 520         }
 521
 522         if (child == NULL) {
 523                 DEBUG(5, ("Already reaped child %u died\n", (unsigned int)pid));
 524                 return;
 525         }
 526
 527         remove_fd_event(&child->event);
 528         close(child->event.fd);
 529         child->event.fd = 0;
 530         child->event.flags = 0;
 531         child->pid = 0;
 532
 533         schedule_async_request(child);
 534 }
 535
 536 /* Ensure any negative cache entries with the netbios or realm names are removed. */
 537
 538 void winbindd_flush_negative_conn_cache(struct winbindd_domain *domain)
 539 {
 540         flush_negative_conn_cache_for_domain(domain->name);
 541         if (*domain->alt_name) {
 542                 flush_negative_conn_cache_for_domain(domain->alt_name);
 543         }
 544 }
 545
 546 /* Set our domains as offline and forward the offline message to our children. */
 547
 548 void winbind_msg_offline(struct messaging_context *msg_ctx,
 549                          void *private_data,
 550                          uint32_t msg_type,
 551                          struct server_id server_id,
 552                          DATA_BLOB *data)
 553 {
 554         struct winbindd_child *child;
 555         struct winbindd_domain *domain;
 556
 557         DEBUG(10,("winbind_msg_offline: got offline message.\n"));
 558
 559         if (!lp_winbind_offline_logon()) {
 560                 DEBUG(10,("winbind_msg_offline: rejecting offline message.\n"));
 561                 return;
 562         }
 563
 564         /* Set our global state as offline. */
 565         if (!set_global_winbindd_state_offline()) {
 566                 DEBUG(10,("winbind_msg_offline: offline request failed.\n"));
 567                 return;
 568         }
 569
 570         /* Set all our domains as offline. */
 571         for (domain = domain_list(); domain; domain = domain->next) {
 572                 if (domain->internal) {
 573                         continue;
 574                 }
 575                 DEBUG(5,("winbind_msg_offline: marking %s offline.\n", domain->name));
 576                 set_domain_offline(domain);
 577         }
 578
 579         for (child = children; child != NULL; child = child->next) {
 580                 /* Don't send message to idmap child.  We've already
 581                    done so above. */
 582                 if (!child->domain || (child == idmap_child())) {
 583                         continue;
 584                 }
 585
 586                 /* Or internal domains (this should not be possible....) */
 587                 if (child->domain->internal) {
 588                         continue;
 589                 }
 590
 591                 /* Each winbindd child should only process requests for one domain - make sure
 592                    we only set it online / offline for that domain. */
 593
 594                 DEBUG(10,("winbind_msg_offline: sending message to pid %u for domain %s.\n",
 595                         (unsigned int)child->pid, domain->name ));
 596
 597                 messaging_send_buf(msg_ctx, pid_to_procid(child->pid),
 598                                    MSG_WINBIND_OFFLINE,
 599                                    (uint8 *)child->domain->name,
 600                                    strlen(child->domain->name)+1);
 601         }
 602 }
 603
 604 /* Set our domains as online and forward the online message to our children. */
 605
 606 void winbind_msg_online(struct messaging_context *msg_ctx,
 607                         void *private_data,
 608                         uint32_t msg_type,
 609                         struct server_id server_id,
 610                         DATA_BLOB *data)
 611 {
 612         struct winbindd_child *child;
 613         struct winbindd_domain *domain;
 614
 615         DEBUG(10,("winbind_msg_online: got online message.\n"));
 616
 617         if (!lp_winbind_offline_logon()) {
 618                 DEBUG(10,("winbind_msg_online: rejecting online message.\n"));
 619                 return;
 620         }
 621
 622         /* Set our global state as online. */
 623         set_global_winbindd_state_online();
 624
 625         smb_nscd_flush_user_cache();
 626         smb_nscd_flush_group_cache();
 627
 628         /* Set all our domains as online. */
 629         for (domain = domain_list(); domain; domain = domain->next) {
 630                 if (domain->internal) {
 631                         continue;
 632                 }
 633                 DEBUG(5,("winbind_msg_online: requesting %s to go online.\n", domain->name));
 634
 635                 winbindd_flush_negative_conn_cache(domain);
 636                 set_domain_online_request(domain);
 637
 638                 /* Send an online message to the idmap child when our
 639                    primary domain comes back online */
 640
 641                 if ( domain->primary ) {
 642                         struct winbindd_child *idmap = idmap_child();
 643
 644                         if ( idmap->pid != 0 ) {
 645                                 messaging_send_buf(msg_ctx,
 646                                                    pid_to_procid(idmap->pid),
 647                                                    MSG_WINBIND_ONLINE,
 648                                                    (uint8 *)domain->name,
 649                                                    strlen(domain->name)+1);
 650                         }
 651
 652                 }
 653         }
 654
 655         for (child = children; child != NULL; child = child->next) {
 656                 /* Don't send message to idmap child. */
 657                 if (!child->domain || (child == idmap_child())) {
 658                         continue;
 659                 }
 660
 661                 /* Or internal domains (this should not be possible....) */
 662                 if (child->domain->internal) {
 663                         continue;
 664                 }
 665
 666                 /* Each winbindd child should only process requests for one domain - make sure
 667                    we only set it online / offline for that domain. */
 668
 669                 DEBUG(10,("winbind_msg_online: sending message to pid %u for domain %s.\n",
 670                         (unsigned int)child->pid, child->domain->name ));
 671
 672                 messaging_send_buf(msg_ctx, pid_to_procid(child->pid),
 673                                    MSG_WINBIND_ONLINE,
 674                                    (uint8 *)child->domain->name,
 675                                    strlen(child->domain->name)+1);
 676         }
 677 }
 678
 679 /* Forward the online/offline messages to our children. */
 680 void winbind_msg_onlinestatus(struct messaging_context *msg_ctx,
 681                               void *private_data,
 682                               uint32_t msg_type,
 683                               struct server_id server_id,
 684                               DATA_BLOB *data)
 685 {
 686         struct winbindd_child *child;
 687
 688         DEBUG(10,("winbind_msg_onlinestatus: got onlinestatus message.\n"));
 689
 690         for (child = children; child != NULL; child = child->next) {
 691                 if (child->domain && child->domain->primary) {
 692                         DEBUG(10,("winbind_msg_onlinestatus: "
 693                                   "sending message to pid %u of primary domain.\n",
 694                                   (unsigned int)child->pid));
 695                         messaging_send_buf(msg_ctx, pid_to_procid(child->pid),
 696                                            MSG_WINBIND_ONLINESTATUS,
 697                                            (uint8 *)data->data,
 698                                            data->length);
 699                         break;
 700                 }
 701         }
 702 }
 703
 704 void winbind_msg_dump_event_list(struct messaging_context *msg_ctx,
 705                                  void *private_data,
 706                                  uint32_t msg_type,
 707                                  struct server_id server_id,
 708                                  DATA_BLOB *data)
 709 {
 710         struct winbindd_child *child;
 711
 712         DEBUG(10,("winbind_msg_dump_event_list received\n"));
 713
 714         dump_event_list(winbind_event_context());
 715
 716         for (child = children; child != NULL; child = child->next) {
 717
 718                 DEBUG(10,("winbind_msg_dump_event_list: sending message to pid %u\n",
 719                         (unsigned int)child->pid));
 720
 721                 messaging_send_buf(msg_ctx, pid_to_procid(child->pid),
 722                                    MSG_DUMP_EVENT_LIST,
 723                                    NULL, 0);
 724         }
 725
 726 }
 727
 728 static void account_lockout_policy_handler(struct event_context *ctx,
 729                                            struct timed_event *te,
 730                                            const struct timeval *now,
 731                                            void *private_data)
 732 {
 733         struct winbindd_child *child =
 734                 (struct winbindd_child *)private_data;
 735         TALLOC_CTX *mem_ctx = NULL;
 736         struct winbindd_methods *methods;
 737         SAM_UNK_INFO_12 lockout_policy;
 738         NTSTATUS result;
 739
 740         DEBUG(10,("account_lockout_policy_handler called\n"));
 741
 742         TALLOC_FREE(child->lockout_policy_event);
 743
 744         if ( !winbindd_can_contact_domain( child->domain ) ) {
 745                 DEBUG(10,("account_lockout_policy_handler: Removing myself since I "
 746                           "do not have an incoming trust to domain %s\n",
 747                           child->domain->name));
 748
 749                 return;
 750         }
 751
 752         methods = child->domain->methods;
 753
 754         mem_ctx = talloc_init("account_lockout_policy_handler ctx");
 755         if (!mem_ctx) {
 756                 result = NT_STATUS_NO_MEMORY;
 757         } else {
 758                 result = methods->lockout_policy(child->domain, mem_ctx, &lockout_policy);
 759         }
 760
 761         talloc_destroy(mem_ctx);
 762
 763         if (!NT_STATUS_IS_OK(result)) {
 764                 DEBUG(10,("account_lockout_policy_handler: lockout_policy failed error %s\n",
 765                          nt_errstr(result)));
 766         }
 767
 768         child->lockout_policy_event = event_add_timed(winbind_event_context(), NULL,
 769                                                       timeval_current_ofs(3600, 0),
 770                                                       "account_lockout_policy_handler",
 771                                                       account_lockout_policy_handler,
 772                                                       child);
 773 }
 774
 775 /* Deal with a request to go offline. */
 776
 777 static void child_msg_offline(struct messaging_context *msg,
 778                               void *private_data,
 779                               uint32_t msg_type,
 780                               struct server_id server_id,
 781                               DATA_BLOB *data)
 782 {
 783         struct winbindd_domain *domain;
 784         const char *domainname = (const char *)data->data;
 785
 786         if (data->data == NULL || data->length == 0) {
 787                 return;
 788         }
 789
 790         DEBUG(5,("child_msg_offline received for domain %s.\n", domainname));
 791
 792         if (!lp_winbind_offline_logon()) {
 793                 DEBUG(10,("child_msg_offline: rejecting offline message.\n"));
 794                 return;
 795         }
 796
 797         /* Mark the requested domain offline. */
 798
 799         for (domain = domain_list(); domain; domain = domain->next) {
 800                 if (domain->internal) {
 801                         continue;
 802                 }
 803                 if (strequal(domain->name, domainname)) {
 804                         DEBUG(5,("child_msg_offline: marking %s offline.\n", domain->name));
 805                         set_domain_offline(domain);
 806                 }
 807         }
 808 }
 809
 810 /* Deal with a request to go online. */
 811
 812 static void child_msg_online(struct messaging_context *msg,
 813                              void *private_data,
 814                              uint32_t msg_type,
 815                              struct server_id server_id,
 816                              DATA_BLOB *data)
 817 {
 818         struct winbindd_domain *domain;
 819         const char *domainname = (const char *)data->data;
 820
 821         if (data->data == NULL || data->length == 0) {
 822                 return;
 823         }
 824
 825         DEBUG(5,("child_msg_online received for domain %s.\n", domainname));
 826
 827         if (!lp_winbind_offline_logon()) {
 828                 DEBUG(10,("child_msg_online: rejecting online message.\n"));
 829                 return;
 830         }
 831
 832         /* Set our global state as online. */
 833         set_global_winbindd_state_online();
 834
 835         /* Try and mark everything online - delete any negative cache entries
 836            to force a reconnect now. */
 837
 838         for (domain = domain_list(); domain; domain = domain->next) {
 839                 if (domain->internal) {
 840                         continue;
 841                 }
 842                 if (strequal(domain->name, domainname)) {
 843                         DEBUG(5,("child_msg_online: requesting %s to go online.\n", domain->name));
 844                         winbindd_flush_negative_conn_cache(domain);
 845                         set_domain_online_request(domain);
 846                 }
 847         }
 848 }
 849
 850 static const char *collect_onlinestatus(TALLOC_CTX *mem_ctx)
 851 {
 852         struct winbindd_domain *domain;
 853         char *buf = NULL;
 854
 855         if ((buf = talloc_asprintf(mem_ctx, "global:%s ",
 856                                    get_global_winbindd_state_offline() ?
 857                                    "Offline":"Online")) == NULL) {
 858                 return NULL;
 859         }
 860
 861         for (domain = domain_list(); domain; domain = domain->next) {
 862                 if ((buf = talloc_asprintf_append(buf, "%s:%s ",
 863                                                   domain->name,
 864                                                   domain->online ?
 865                                                   "Online":"Offline")) == NULL) {
 866                         return NULL;
 867                 }
 868         }
 869
 870         buf = talloc_asprintf_append(buf, "\n");
 871
 872         DEBUG(5,("collect_onlinestatus: %s", buf));
 873
 874         return buf;
 875 }
 876
 877 static void child_msg_onlinestatus(struct messaging_context *msg_ctx,
 878                                    void *private_data,
 879                                    uint32_t msg_type,
 880                                    struct server_id server_id,
 881                                    DATA_BLOB *data)
 882 {
 883         TALLOC_CTX *mem_ctx;
 884         const char *message;
 885         struct server_id *sender;
 886
 887         DEBUG(5,("winbind_msg_onlinestatus received.\n"));
 888
 889         if (!data->data) {
 890                 return;
 891         }
 892
 893         sender = (struct server_id *)data->data;
 894
 895         mem_ctx = talloc_init("winbind_msg_onlinestatus");
 896         if (mem_ctx == NULL) {
 897                 return;
 898         }
 899
 900         message = collect_onlinestatus(mem_ctx);
 901         if (message == NULL) {
 902                 talloc_destroy(mem_ctx);
 903                 return;
 904         }
 905
 906         messaging_send_buf(msg_ctx, *sender, MSG_WINBIND_ONLINESTATUS,
 907                            (uint8 *)message, strlen(message) + 1);
 908
 909         talloc_destroy(mem_ctx);
 910 }
 911
 912 static void child_msg_dump_event_list(struct messaging_context *msg,
 913                                       void *private_data,
 914                                       uint32_t msg_type,
 915                                       struct server_id server_id,
 916                                       DATA_BLOB *data)
 917 {
 918         DEBUG(5,("child_msg_dump_event_list received\n"));
 919
 920         dump_event_list(winbind_event_context());
 921 }
 922
 923
 924 static BOOL fork_domain_child(struct winbindd_child *child)
 925 {
 926         int fdpair[2];
 927         struct winbindd_cli_state state;
 928         struct winbindd_domain *domain;
 929
 930         if (socketpair(AF_UNIX, SOCK_STREAM, 0, fdpair) != 0) {
 931                 DEBUG(0, ("Could not open child pipe: %s\n",
 932                           strerror(errno)));
 933                 return False;
 934         }
 935
 936         ZERO_STRUCT(state);
 937         state.pid = sys_getpid();
 938
 939         /* Stop zombies */
 940         CatchChild();
 941
 942         child->pid = sys_fork();
 943
 944         if (child->pid == -1) {
 945                 DEBUG(0, ("Could not fork: %s\n", strerror(errno)));
 946                 return False;
 947         }
 948
 949         if (child->pid != 0) {
 950                 /* Parent */
 951                 close(fdpair[0]);
 952                 child->next = child->prev = NULL;
 953                 DLIST_ADD(children, child);
 954                 child->event.fd = fdpair[1];
 955                 child->event.flags = 0;
 956                 child->requests = NULL;
 957                 add_fd_event(&child->event);
 958                 return True;
 959         }
 960
 961         /* Child */
 962
 963         state.sock = fdpair[0];
 964         close(fdpair[1]);
 965
 966         /* tdb needs special fork handling */
 967         if (tdb_reopen_all(1) == -1) {
 968                 DEBUG(0,("tdb_reopen_all failed.\n"));
 969                 _exit(0);
 970         }
 971
 972         close_conns_after_fork();
 973
 974         if (!override_logfile) {
 975                 lp_set_logfile(child->logfilename);
 976                 reopen_logs();
 977         }
 978
 979         /*
 980          * For clustering, we need to re-init our ctdbd connection after the
 981          * fork
 982          */
 983         if (!NT_STATUS_IS_OK(messaging_reinit(winbind_messaging_context())))
 984                 exit(1);
 985
 986         /* Don't handle the same messages as our parent. */
 987         messaging_deregister(winbind_messaging_context(),
 988                              MSG_SMB_CONF_UPDATED, NULL);
 989         messaging_deregister(winbind_messaging_context(),
 990                              MSG_SHUTDOWN, NULL);
 991         messaging_deregister(winbind_messaging_context(),
 992                              MSG_WINBIND_OFFLINE, NULL);
 993         messaging_deregister(winbind_messaging_context(),
 994                              MSG_WINBIND_ONLINE, NULL);
 995         messaging_deregister(winbind_messaging_context(),
 996                              MSG_WINBIND_ONLINESTATUS, NULL);
 997         messaging_deregister(winbind_messaging_context(),
 998                              MSG_DUMP_EVENT_LIST, NULL);
 999
1000         /* Handle online/offline messages. */
1001         messaging_register(winbind_messaging_context(), NULL,
1002                            MSG_WINBIND_OFFLINE, child_msg_offline);
1003         messaging_register(winbind_messaging_context(), NULL,
1004                            MSG_WINBIND_ONLINE, child_msg_online);
1005         messaging_register(winbind_messaging_context(), NULL,
1006                            MSG_WINBIND_ONLINESTATUS, child_msg_onlinestatus);
1007         messaging_register(winbind_messaging_context(), NULL,
1008                            MSG_DUMP_EVENT_LIST, child_msg_dump_event_list);
1009
1010         if ( child->domain ) {
1011                 child->domain->startup = True;
1012                 child->domain->startup_time = time(NULL);
1013         }
1014
1015         /* Ensure we have no pending check_online events other
1016            than one for this domain. */
1017
1018         for (domain = domain_list(); domain; domain = domain->next) {
1019                 if (domain != child->domain) {
1020                         TALLOC_FREE(domain->check_online_event);
1021                 }
1022         }
1023
1024         /* Ensure we're not handling an event inherited from
1025            our parent. */
1026
1027         cancel_named_event(winbind_event_context(),
1028                            "krb5_ticket_refresh_handler");
1029
1030         /* We might be in the idmap child...*/
1031         if (child->domain && !(child->domain->internal) &&
1032             lp_winbind_offline_logon()) {
1033
1034                 set_domain_online_request(child->domain);
1035
1036                 child->lockout_policy_event = event_add_timed(
1037                         winbind_event_context(), NULL, timeval_zero(),
1038                         "account_lockout_policy_handler",
1039                         account_lockout_policy_handler,
1040                         child);
1041         }
1042
1043         while (1) {
1044
1045                 int ret;
1046                 fd_set read_fds;
1047                 struct timeval t;
1048                 struct timeval *tp;
1049                 struct timeval now;
1050
1051                 /* free up any talloc memory */
1052                 lp_TALLOC_FREE();
1053                 main_loop_TALLOC_FREE();
1054
1055                 run_events(winbind_event_context(), 0, NULL, NULL);
1056
1057                 GetTimeOfDay(&now);
1058
1059                 if (child->domain && child->domain->startup &&
1060                                 (now.tv_sec > child->domain->startup_time + 30)) {
1061                         /* No longer in "startup" mode. */
1062                         DEBUG(10,("fork_domain_child: domain %s no longer in 'startup' mode.\n",
1063                                 child->domain->name ));
1064                         child->domain->startup = False;
1065                 }
1066
1067                 tp = get_timed_events_timeout(winbind_event_context(), &t);
1068                 if (tp) {
1069                         DEBUG(11,("select will use timeout of %u.%u seconds\n",
1070                                 (unsigned int)tp->tv_sec, (unsigned int)tp->tv_usec ));
1071                 }
1072
1073                 /* Handle messages */
1074
1075                 message_dispatch(winbind_messaging_context());
1076
1077                 FD_ZERO(&read_fds);
1078                 FD_SET(state.sock, &read_fds);
1079
1080                 ret = sys_select(state.sock + 1, &read_fds, NULL, NULL, tp);
1081
1082                 if (ret == 0) {
1083                         DEBUG(11,("nothing is ready yet, continue\n"));
1084                         continue;
1085                 }
1086
1087                 if (ret == -1 && errno == EINTR) {
1088                         /* We got a signal - continue. */
1089                         continue;
1090                 }
1091
1092                 if (ret == -1 && errno != EINTR) {
1093                         DEBUG(0,("select error occured\n"));
1094                         perror("select");
1095                         return False;
1096                 }
1097
1098                 /* fetch a request from the main daemon */
1099                 child_read_request(&state);
1100
1101                 if (state.finished) {
1102                         /* we lost contact with our parent */
1103                         exit(0);
1104                 }
1105
1106                 DEBUG(4,("child daemon request %d\n", (int)state.request.cmd));
1107
1108                 ZERO_STRUCT(state.response);
1109                 state.request.null_term = '\0';
1110                 child_process_request(child->domain, &state);
1111
1112                 SAFE_FREE(state.request.extra_data.data);
1113
1114                 cache_store_response(sys_getpid(), &state.response);
1115
1116                 SAFE_FREE(state.response.extra_data.data);
1117
1118                 /* We just send the result code back, the result
1119                  * structure needs to be fetched via the
1120                  * winbindd_cache. Hmm. That needs fixing... */
1121
1122                 if (write_data(state.sock,
1123                                (const char *)&state.response.result,
1124                                sizeof(state.response.result)) !=
1125                     sizeof(state.response.result)) {
1126                         DEBUG(0, ("Could not write result\n"));
1127                         exit(1);
1128                 }
1129         }
1130 }