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