source/winbindd/winbindd.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3
   4    Winbind daemon for ntdom nss module
   5
   6    Copyright (C) by Tim Potter 2000-2002
   7    Copyright (C) Andrew Tridgell 2002
   8    Copyright (C) Jelmer Vernooij 2003
   9    Copyright (C) Volker Lendecke 2004
  10
  11    This program is free software; you can redistribute it and/or modify
  12    it under the terms of the GNU General Public License as published by
  13    the Free Software Foundation; either version 3 of the License, or
  14    (at your option) any later version.
  15
  16    This program is distributed in the hope that it will be useful,
  17    but WITHOUT ANY WARRANTY; without even the implied warranty of
  18    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19    GNU General Public License for more details.
  20
  21    You should have received a copy of the GNU General Public License
  22    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  23 */
  24
  25 #include "includes.h"
  26 #include "winbindd.h"
  27
  28 #undef DBGC_CLASS
  29 #define DBGC_CLASS DBGC_WINBIND
  30
  31 bool opt_nocache = False;
  32 static bool interactive = False;
  33
  34 extern bool override_logfile;
  35
  36 struct event_context *winbind_event_context(void)
  37 {
  38         static struct event_context *ctx;
  39
  40         if (!ctx && !(ctx = event_context_init(NULL))) {
  41                 smb_panic("Could not init winbind event context");
  42         }
  43         return ctx;
  44 }
  45
  46 struct messaging_context *winbind_messaging_context(void)
  47 {
  48         static struct messaging_context *ctx;
  49
  50         if (ctx == NULL) {
  51                 ctx = messaging_init(NULL, server_id_self(),
  52                                      winbind_event_context());
  53         }
  54         if (ctx == NULL) {
  55                 DEBUG(0, ("Could not init winbind messaging context.\n"));
  56         }
  57         return ctx;
  58 }
  59
  60 /* Reload configuration */
  61
  62 static bool reload_services_file(const char *logfile)
  63 {
  64         bool ret;
  65
  66         if (lp_loaded()) {
  67                 const char *fname = lp_configfile();
  68
  69                 if (file_exist(fname,NULL) && !strcsequal(fname,get_dyn_CONFIGFILE())) {
  70                         set_dyn_CONFIGFILE(fname);
  71                 }
  72         }
  73
  74         /* if this is a child, restore the logfile to the special
  75            name - <domain>, idmap, etc. */
  76         if (logfile && *logfile) {
  77                 lp_set_logfile(logfile);
  78         }
  79
  80         reopen_logs();
  81         ret = lp_load(get_dyn_CONFIGFILE(),False,False,True,True);
  82
  83         reopen_logs();
  84         load_interfaces();
  85
  86         return(ret);
  87 }
  88
  89
  90 /**************************************************************************** **
  91  Handle a fault..
  92  **************************************************************************** */
  93
  94 static void fault_quit(void)
  95 {
  96         dump_core();
  97 }
  98
  99 static void winbindd_status(void)
 100 {
 101         struct winbindd_cli_state *tmp;
 102
 103         DEBUG(0, ("winbindd status:\n"));
 104
 105         /* Print client state information */
 106
 107         DEBUG(0, ("\t%d clients currently active\n", winbindd_num_clients()));
 108
 109         if (DEBUGLEVEL >= 2 && winbindd_num_clients()) {
 110                 DEBUG(2, ("\tclient list:\n"));
 111                 for(tmp = winbindd_client_list(); tmp; tmp = tmp->next) {
 112                         DEBUGADD(2, ("\t\tpid %lu, sock %d\n",
 113                                   (unsigned long)tmp->pid, tmp->sock));
 114                 }
 115         }
 116 }
 117
 118 /* Print winbindd status to log file */
 119
 120 static void print_winbindd_status(void)
 121 {
 122         winbindd_status();
 123 }
 124
 125 /* Flush client cache */
 126
 127 static void flush_caches(void)
 128 {
 129         /* We need to invalidate cached user list entries on a SIGHUP
 130            otherwise cached access denied errors due to restrict anonymous
 131            hang around until the sequence number changes. */
 132
 133         if (!wcache_invalidate_cache()) {
 134                 DEBUG(0, ("invalidating the cache failed; revalidate the cache\n"));
 135                 if (!winbindd_cache_validate_and_initialize()) {
 136                         exit(1);
 137                 }
 138         }
 139 }
 140
 141 /* Handle the signal by unlinking socket and exiting */
 142
 143 static void terminate(bool is_parent)
 144 {
 145         if (is_parent) {
 146                 /* When parent goes away we should
 147                  * remove the socket file. Not so
 148                  * when children terminate.
 149                  */
 150                 char *path = NULL;
 151
 152                 if (asprintf(&path, "%s/%s",
 153                         get_winbind_pipe_dir(), WINBINDD_SOCKET_NAME) > 0) {
 154                         unlink(path);
 155                         SAFE_FREE(path);
 156                 }
 157         }
 158
 159         idmap_close();
 160
 161         trustdom_cache_shutdown();
 162
 163 #if 0
 164         if (interactive) {
 165                 TALLOC_CTX *mem_ctx = talloc_init("end_description");
 166                 char *description = talloc_describe_all(mem_ctx);
 167
 168                 DEBUG(3, ("tallocs left:\n%s\n", description));
 169                 talloc_destroy(mem_ctx);
 170         }
 171 #endif
 172
 173         exit(0);
 174 }
 175
 176 static bool do_sigterm;
 177
 178 static void termination_handler(int signum)
 179 {
 180         do_sigterm = True;
 181         sys_select_signal(signum);
 182 }
 183
 184 static bool do_sigusr2;
 185
 186 static void sigusr2_handler(int signum)
 187 {
 188         do_sigusr2 = True;
 189         sys_select_signal(SIGUSR2);
 190 }
 191
 192 static bool do_sighup;
 193
 194 static void sighup_handler(int signum)
 195 {
 196         do_sighup = True;
 197         sys_select_signal(SIGHUP);
 198 }
 199
 200 static bool do_sigchld;
 201
 202 static void sigchld_handler(int signum)
 203 {
 204         do_sigchld = True;
 205         sys_select_signal(SIGCHLD);
 206 }
 207
 208 /* React on 'smbcontrol winbindd reload-config' in the same way as on SIGHUP*/
 209 static void msg_reload_services(struct messaging_context *msg,
 210                                 void *private_data,
 211                                 uint32_t msg_type,
 212                                 struct server_id server_id,
 213                                 DATA_BLOB *data)
 214 {
 215         /* Flush various caches */
 216         flush_caches();
 217         reload_services_file((const char *) private_data);
 218 }
 219
 220 /* React on 'smbcontrol winbindd shutdown' in the same way as on SIGTERM*/
 221 static void msg_shutdown(struct messaging_context *msg,
 222                          void *private_data,
 223                          uint32_t msg_type,
 224                          struct server_id server_id,
 225                          DATA_BLOB *data)
 226 {
 227         do_sigterm = True;
 228 }
 229
 230
 231 static void winbind_msg_validate_cache(struct messaging_context *msg_ctx,
 232                                        void *private_data,
 233                                        uint32_t msg_type,
 234                                        struct server_id server_id,
 235                                        DATA_BLOB *data)
 236 {
 237         uint8 ret;
 238         pid_t child_pid;
 239         struct sigaction act;
 240         struct sigaction oldact;
 241
 242         DEBUG(10, ("winbindd_msg_validate_cache: got validate-cache "
 243                    "message.\n"));
 244
 245         /*
 246          * call the validation code from a child:
 247          * so we don't block the main winbindd and the validation
 248          * code can safely use fork/waitpid...
 249          */
 250         CatchChild();
 251         child_pid = sys_fork();
 252
 253         if (child_pid == -1) {
 254                 DEBUG(1, ("winbind_msg_validate_cache: Could not fork: %s\n",
 255                           strerror(errno)));
 256                 return;
 257         }
 258
 259         if (child_pid != 0) {
 260                 /* parent */
 261                 DEBUG(5, ("winbind_msg_validate_cache: child created with "
 262                           "pid %d.\n", child_pid));
 263                 return;
 264         }
 265
 266         /* child */
 267
 268         /* install default SIGCHLD handler: validation code uses fork/waitpid */
 269         ZERO_STRUCT(act);
 270         act.sa_handler = SIG_DFL;
 271 #ifdef SA_RESTART
 272         /* We *want* SIGALRM to interrupt a system call. */
 273         act.sa_flags = SA_RESTART;
 274 #endif
 275         sigemptyset(&act.sa_mask);
 276         sigaddset(&act.sa_mask,SIGCHLD);
 277         sigaction(SIGCHLD,&act,&oldact);
 278
 279         ret = (uint8)winbindd_validate_cache_nobackup();
 280         DEBUG(10, ("winbindd_msg_validata_cache: got return value %d\n", ret));
 281         messaging_send_buf(msg_ctx, server_id, MSG_WINBIND_VALIDATE_CACHE, &ret,
 282                            (size_t)1);
 283         _exit(0);
 284 }
 285
 286 static struct winbindd_dispatch_table {
 287         enum winbindd_cmd cmd;
 288         void (*fn)(struct winbindd_cli_state *state);
 289         const char *winbindd_cmd_name;
 290 } dispatch_table[] = {
 291
 292         /* User functions */
 293
 294         { WINBINDD_GETPWNAM, winbindd_getpwnam, "GETPWNAM" },
 295         { WINBINDD_GETPWUID, winbindd_getpwuid, "GETPWUID" },
 296
 297         { WINBINDD_SETPWENT, winbindd_setpwent, "SETPWENT" },
 298         { WINBINDD_ENDPWENT, winbindd_endpwent, "ENDPWENT" },
 299         { WINBINDD_GETPWENT, winbindd_getpwent, "GETPWENT" },
 300
 301         { WINBINDD_GETGROUPS, winbindd_getgroups, "GETGROUPS" },
 302         { WINBINDD_GETUSERSIDS, winbindd_getusersids, "GETUSERSIDS" },
 303         { WINBINDD_GETUSERDOMGROUPS, winbindd_getuserdomgroups,
 304           "GETUSERDOMGROUPS" },
 305
 306         /* Group functions */
 307
 308         { WINBINDD_GETGRNAM, winbindd_getgrnam, "GETGRNAM" },
 309         { WINBINDD_GETGRGID, winbindd_getgrgid, "GETGRGID" },
 310         { WINBINDD_SETGRENT, winbindd_setgrent, "SETGRENT" },
 311         { WINBINDD_ENDGRENT, winbindd_endgrent, "ENDGRENT" },
 312         { WINBINDD_GETGRENT, winbindd_getgrent, "GETGRENT" },
 313         { WINBINDD_GETGRLST, winbindd_getgrent, "GETGRLST" },
 314
 315         /* PAM auth functions */
 316
 317         { WINBINDD_PAM_AUTH, winbindd_pam_auth, "PAM_AUTH" },
 318         { WINBINDD_PAM_AUTH_CRAP, winbindd_pam_auth_crap, "AUTH_CRAP" },
 319         { WINBINDD_PAM_CHAUTHTOK, winbindd_pam_chauthtok, "CHAUTHTOK" },
 320         { WINBINDD_PAM_LOGOFF, winbindd_pam_logoff, "PAM_LOGOFF" },
 321         { WINBINDD_PAM_CHNG_PSWD_AUTH_CRAP, winbindd_pam_chng_pswd_auth_crap, "CHNG_PSWD_AUTH_CRAP" },
 322
 323         /* Enumeration functions */
 324
 325         { WINBINDD_LIST_USERS, winbindd_list_users, "LIST_USERS" },
 326         { WINBINDD_LIST_GROUPS, winbindd_list_groups, "LIST_GROUPS" },
 327         { WINBINDD_LIST_TRUSTDOM, winbindd_list_trusted_domains,
 328           "LIST_TRUSTDOM" },
 329         { WINBINDD_SHOW_SEQUENCE, winbindd_show_sequence, "SHOW_SEQUENCE" },
 330
 331         /* SID related functions */
 332
 333         { WINBINDD_LOOKUPSID, winbindd_lookupsid, "LOOKUPSID" },
 334         { WINBINDD_LOOKUPNAME, winbindd_lookupname, "LOOKUPNAME" },
 335         { WINBINDD_LOOKUPRIDS, winbindd_lookuprids, "LOOKUPRIDS" },
 336
 337         /* Lookup related functions */
 338
 339         { WINBINDD_SID_TO_UID, winbindd_sid_to_uid, "SID_TO_UID" },
 340         { WINBINDD_SID_TO_GID, winbindd_sid_to_gid, "SID_TO_GID" },
 341         { WINBINDD_UID_TO_SID, winbindd_uid_to_sid, "UID_TO_SID" },
 342         { WINBINDD_GID_TO_SID, winbindd_gid_to_sid, "GID_TO_SID" },
 343         { WINBINDD_ALLOCATE_UID, winbindd_allocate_uid, "ALLOCATE_UID" },
 344         { WINBINDD_ALLOCATE_GID, winbindd_allocate_gid, "ALLOCATE_GID" },
 345         { WINBINDD_SET_MAPPING, winbindd_set_mapping, "SET_MAPPING" },
 346         { WINBINDD_SET_HWM, winbindd_set_hwm, "SET_HWMS" },
 347
 348         /* Miscellaneous */
 349
 350         { WINBINDD_CHECK_MACHACC, winbindd_check_machine_acct, "CHECK_MACHACC" },
 351         { WINBINDD_PING, winbindd_ping, "PING" },
 352         { WINBINDD_INFO, winbindd_info, "INFO" },
 353         { WINBINDD_INTERFACE_VERSION, winbindd_interface_version,
 354           "INTERFACE_VERSION" },
 355         { WINBINDD_DOMAIN_NAME, winbindd_domain_name, "DOMAIN_NAME" },
 356         { WINBINDD_DOMAIN_INFO, winbindd_domain_info, "DOMAIN_INFO" },
 357         { WINBINDD_NETBIOS_NAME, winbindd_netbios_name, "NETBIOS_NAME" },
 358         { WINBINDD_PRIV_PIPE_DIR, winbindd_priv_pipe_dir,
 359           "WINBINDD_PRIV_PIPE_DIR" },
 360         { WINBINDD_GETDCNAME, winbindd_getdcname, "GETDCNAME" },
 361         { WINBINDD_DSGETDCNAME, winbindd_dsgetdcname, "DSGETDCNAME" },
 362
 363         /* Credential cache access */
 364         { WINBINDD_CCACHE_NTLMAUTH, winbindd_ccache_ntlm_auth, "NTLMAUTH" },
 365
 366         /* WINS functions */
 367
 368         { WINBINDD_WINS_BYNAME, winbindd_wins_byname, "WINS_BYNAME" },
 369         { WINBINDD_WINS_BYIP, winbindd_wins_byip, "WINS_BYIP" },
 370
 371         /* End of list */
 372
 373         { WINBINDD_NUM_CMDS, NULL, "NONE" }
 374 };
 375
 376 static void process_request(struct winbindd_cli_state *state)
 377 {
 378         struct winbindd_dispatch_table *table = dispatch_table;
 379
 380         /* Free response data - we may be interrupted and receive another
 381            command before being able to send this data off. */
 382
 383         SAFE_FREE(state->response.extra_data.data);
 384
 385         ZERO_STRUCT(state->response);
 386
 387         state->response.result = WINBINDD_PENDING;
 388         state->response.length = sizeof(struct winbindd_response);
 389
 390         state->mem_ctx = talloc_init("winbind request");
 391         if (state->mem_ctx == NULL)
 392                 return;
 393
 394         /* Remember who asked us. */
 395         state->pid = state->request.pid;
 396
 397         /* Process command */
 398
 399         for (table = dispatch_table; table->fn; table++) {
 400                 if (state->request.cmd == table->cmd) {
 401                         DEBUG(10,("process_request: request fn %s\n",
 402                                   table->winbindd_cmd_name ));
 403                         table->fn(state);
 404                         break;
 405                 }
 406         }
 407
 408         if (!table->fn) {
 409                 DEBUG(10,("process_request: unknown request fn number %d\n",
 410                           (int)state->request.cmd ));
 411                 request_error(state);
 412         }
 413 }
 414
 415 /*
 416  * A list of file descriptors being monitored by select in the main processing
 417  * loop. fd_event->handler is called whenever the socket is readable/writable.
 418  */
 419
 420 static struct fd_event *fd_events = NULL;
 421
 422 void add_fd_event(struct fd_event *ev)
 423 {
 424         struct fd_event *match;
 425
 426         /* only add unique fd_event structs */
 427
 428         for (match=fd_events; match; match=match->next ) {
 429 #ifdef DEVELOPER
 430                 SMB_ASSERT( match != ev );
 431 #else
 432                 if ( match == ev )
 433                         return;
 434 #endif
 435         }
 436
 437         DLIST_ADD(fd_events, ev);
 438 }
 439
 440 void remove_fd_event(struct fd_event *ev)
 441 {
 442         DLIST_REMOVE(fd_events, ev);
 443 }
 444
 445 /*
 446  * Handler for fd_events to complete a read/write request, set up by
 447  * setup_async_read/setup_async_write.
 448  */
 449
 450 static void rw_callback(struct fd_event *event, int flags)
 451 {
 452         size_t todo;
 453         ssize_t done = 0;
 454
 455         todo = event->length - event->done;
 456
 457         if (event->flags & EVENT_FD_WRITE) {
 458                 SMB_ASSERT(flags == EVENT_FD_WRITE);
 459                 done = sys_write(event->fd,
 460                                  &((char *)event->data)[event->done],
 461                                  todo);
 462
 463                 if (done <= 0) {
 464                         event->flags = 0;
 465                         event->finished(event->private_data, False);
 466                         return;
 467                 }
 468         }
 469
 470         if (event->flags & EVENT_FD_READ) {
 471                 SMB_ASSERT(flags == EVENT_FD_READ);
 472                 done = sys_read(event->fd, &((char *)event->data)[event->done],
 473                                 todo);
 474
 475                 if (done <= 0) {
 476                         event->flags = 0;
 477                         event->finished(event->private_data, False);
 478                         return;
 479                 }
 480         }
 481
 482         event->done += done;
 483
 484         if (event->done == event->length) {
 485                 event->flags = 0;
 486                 event->finished(event->private_data, True);
 487         }
 488 }
 489
 490 /*
 491  * Request an async read/write on a fd_event structure. (*finished) is called
 492  * when the request is completed or an error had occurred.
 493  */
 494
 495 void setup_async_read(struct fd_event *event, void *data, size_t length,
 496                       void (*finished)(void *private_data, bool success),
 497                       void *private_data)
 498 {
 499         SMB_ASSERT(event->flags == 0);
 500         event->data = data;
 501         event->length = length;
 502         event->done = 0;
 503         event->handler = rw_callback;
 504         event->finished = finished;
 505         event->private_data = private_data;
 506         event->flags = EVENT_FD_READ;
 507 }
 508
 509 void setup_async_write(struct fd_event *event, void *data, size_t length,
 510                        void (*finished)(void *private_data, bool success),
 511                        void *private_data)
 512 {
 513         SMB_ASSERT(event->flags == 0);
 514         event->data = data;
 515         event->length = length;
 516         event->done = 0;
 517         event->handler = rw_callback;
 518         event->finished = finished;
 519         event->private_data = private_data;
 520         event->flags = EVENT_FD_WRITE;
 521 }
 522
 523 /*
 524  * This is the main event loop of winbind requests. It goes through a
 525  * state-machine of 3 read/write requests, 4 if you have extra data to send.
 526  *
 527  * An idle winbind client has a read request of 4 bytes outstanding,
 528  * finalizing function is request_len_recv, checking the length. request_recv
 529  * then processes the packet. The processing function then at some point has
 530  * to call request_finished which schedules sending the response.
 531  */
 532
 533 static void request_len_recv(void *private_data, bool success);
 534 static void request_recv(void *private_data, bool success);
 535 static void request_main_recv(void *private_data, bool success);
 536 static void request_finished(struct winbindd_cli_state *state);
 537 static void response_main_sent(void *private_data, bool success);
 538 static void response_extra_sent(void *private_data, bool success);
 539
 540 static void response_extra_sent(void *private_data, bool success)
 541 {
 542         struct winbindd_cli_state *state =
 543                 talloc_get_type_abort(private_data, struct winbindd_cli_state);
 544
 545         TALLOC_FREE(state->mem_ctx);
 546
 547         if (!success) {
 548                 state->finished = True;
 549                 return;
 550         }
 551
 552         SAFE_FREE(state->response.extra_data.data);
 553
 554         setup_async_read(&state->fd_event, &state->request, sizeof(uint32),
 555                          request_len_recv, state);
 556 }
 557
 558 static void response_main_sent(void *private_data, bool success)
 559 {
 560         struct winbindd_cli_state *state =
 561                 talloc_get_type_abort(private_data, struct winbindd_cli_state);
 562
 563         if (!success) {
 564                 state->finished = True;
 565                 return;
 566         }
 567
 568         if (state->response.length == sizeof(state->response)) {
 569                 TALLOC_FREE(state->mem_ctx);
 570
 571                 setup_async_read(&state->fd_event, &state->request,
 572                                  sizeof(uint32), request_len_recv, state);
 573                 return;
 574         }
 575
 576         setup_async_write(&state->fd_event, state->response.extra_data.data,
 577                           state->response.length - sizeof(state->response),
 578                           response_extra_sent, state);
 579 }
 580
 581 static void request_finished(struct winbindd_cli_state *state)
 582 {
 583         /* Make sure request.extra_data is freed when finish processing a request */
 584         SAFE_FREE(state->request.extra_data.data);
 585         setup_async_write(&state->fd_event, &state->response,
 586                           sizeof(state->response), response_main_sent, state);
 587 }
 588
 589 void request_error(struct winbindd_cli_state *state)
 590 {
 591         SMB_ASSERT(state->response.result == WINBINDD_PENDING);
 592         state->response.result = WINBINDD_ERROR;
 593         request_finished(state);
 594 }
 595
 596 void request_ok(struct winbindd_cli_state *state)
 597 {
 598         SMB_ASSERT(state->response.result == WINBINDD_PENDING);
 599         state->response.result = WINBINDD_OK;
 600         request_finished(state);
 601 }
 602
 603 static void request_len_recv(void *private_data, bool success)
 604 {
 605         struct winbindd_cli_state *state =
 606                 talloc_get_type_abort(private_data, struct winbindd_cli_state);
 607
 608         if (!success) {
 609                 state->finished = True;
 610                 return;
 611         }
 612
 613         if (*(uint32 *)(&state->request) != sizeof(state->request)) {
 614                 DEBUG(0,("request_len_recv: Invalid request size received: %d (expected %u)\n",
 615                          *(uint32_t *)(&state->request), (uint32_t)sizeof(state->request)));
 616                 state->finished = True;
 617                 return;
 618         }
 619
 620         setup_async_read(&state->fd_event, (uint32 *)(&state->request)+1,
 621                          sizeof(state->request) - sizeof(uint32),
 622                          request_main_recv, state);
 623 }
 624
 625 static void request_main_recv(void *private_data, bool success)
 626 {
 627         struct winbindd_cli_state *state =
 628                 talloc_get_type_abort(private_data, struct winbindd_cli_state);
 629
 630         if (!success) {
 631                 state->finished = True;
 632                 return;
 633         }
 634
 635         if (state->request.extra_len == 0) {
 636                 state->request.extra_data.data = NULL;
 637                 request_recv(state, True);
 638                 return;
 639         }
 640
 641         if ((!state->privileged) &&
 642             (state->request.extra_len > WINBINDD_MAX_EXTRA_DATA)) {
 643                 DEBUG(3, ("Got request with %d bytes extra data on "
 644                           "unprivileged socket\n", (int)state->request.extra_len));
 645                 state->request.extra_data.data = NULL;
 646                 state->finished = True;
 647                 return;
 648         }
 649
 650         state->request.extra_data.data =
 651                 SMB_MALLOC_ARRAY(char, state->request.extra_len + 1);
 652
 653         if (state->request.extra_data.data == NULL) {
 654                 DEBUG(0, ("malloc failed\n"));
 655                 state->finished = True;
 656                 return;
 657         }
 658
 659         /* Ensure null termination */
 660         state->request.extra_data.data[state->request.extra_len] = '\0';
 661
 662         setup_async_read(&state->fd_event, state->request.extra_data.data,
 663                          state->request.extra_len, request_recv, state);
 664 }
 665
 666 static void request_recv(void *private_data, bool success)
 667 {
 668         struct winbindd_cli_state *state =
 669                 talloc_get_type_abort(private_data, struct winbindd_cli_state);
 670
 671         if (!success) {
 672                 state->finished = True;
 673                 return;
 674         }
 675
 676         process_request(state);
 677 }
 678
 679 /* Process a new connection by adding it to the client connection list */
 680
 681 static void new_connection(int listen_sock, bool privileged)
 682 {
 683         struct sockaddr_un sunaddr;
 684         struct winbindd_cli_state *state;
 685         socklen_t len;
 686         int sock;
 687
 688         /* Accept connection */
 689
 690         len = sizeof(sunaddr);
 691
 692         do {
 693                 sock = accept(listen_sock, (struct sockaddr *)&sunaddr, &len);
 694         } while (sock == -1 && errno == EINTR);
 695
 696         if (sock == -1)
 697                 return;
 698
 699         DEBUG(6,("accepted socket %d\n", sock));
 700
 701         /* Create new connection structure */
 702
 703         if ((state = TALLOC_ZERO_P(NULL, struct winbindd_cli_state)) == NULL) {
 704                 close(sock);
 705                 return;
 706         }
 707
 708         state->sock = sock;
 709
 710         state->last_access = time(NULL);
 711
 712         state->privileged = privileged;
 713
 714         state->fd_event.fd = state->sock;
 715         state->fd_event.flags = 0;
 716         add_fd_event(&state->fd_event);
 717
 718         setup_async_read(&state->fd_event, &state->request, sizeof(uint32),
 719                          request_len_recv, state);
 720
 721         /* Add to connection list */
 722
 723         winbindd_add_client(state);
 724 }
 725
 726 /* Remove a client connection from client connection list */
 727
 728 static void remove_client(struct winbindd_cli_state *state)
 729 {
 730         /* It's a dead client - hold a funeral */
 731
 732         if (state == NULL) {
 733                 return;
 734         }
 735
 736         /* Close socket */
 737
 738         close(state->sock);
 739
 740         /* Free any getent state */
 741
 742         free_getent_state(state->getpwent_state);
 743         free_getent_state(state->getgrent_state);
 744
 745         /* We may have some extra data that was not freed if the client was
 746            killed unexpectedly */
 747
 748         SAFE_FREE(state->response.extra_data.data);
 749
 750         TALLOC_FREE(state->mem_ctx);
 751
 752         remove_fd_event(&state->fd_event);
 753
 754         /* Remove from list and free */
 755
 756         winbindd_remove_client(state);
 757         TALLOC_FREE(state);
 758 }
 759
 760 /* Shutdown client connection which has been idle for the longest time */
 761
 762 static bool remove_idle_client(void)
 763 {
 764         struct winbindd_cli_state *state, *remove_state = NULL;
 765         time_t last_access = 0;
 766         int nidle = 0;
 767
 768         for (state = winbindd_client_list(); state; state = state->next) {
 769                 if (state->response.result != WINBINDD_PENDING &&
 770                     !state->getpwent_state && !state->getgrent_state) {
 771                         nidle++;
 772                         if (!last_access || state->last_access < last_access) {
 773                                 last_access = state->last_access;
 774                                 remove_state = state;
 775                         }
 776                 }
 777         }
 778
 779         if (remove_state) {
 780                 DEBUG(5,("Found %d idle client connections, shutting down sock %d, pid %u\n",
 781                         nidle, remove_state->sock, (unsigned int)remove_state->pid));
 782                 remove_client(remove_state);
 783                 return True;
 784         }
 785
 786         return False;
 787 }
 788
 789 /* check if HUP has been received and reload files */
 790 void winbind_check_sighup(const char *logfile)
 791 {
 792         if (do_sighup) {
 793
 794                 DEBUG(3, ("got SIGHUP\n"));
 795
 796                 flush_caches();
 797                 reload_services_file(logfile);
 798
 799                 do_sighup = False;
 800         }
 801 }
 802
 803 /* check if TERM has been received */
 804 void winbind_check_sigterm(bool is_parent)
 805 {
 806         if (do_sigterm)
 807                 terminate(is_parent);
 808 }
 809
 810 /* Process incoming clients on listen_sock.  We use a tricky non-blocking,
 811    non-forking, non-threaded model which allows us to handle many
 812    simultaneous connections while remaining impervious to many denial of
 813    service attacks. */
 814
 815 static void process_loop(void)
 816 {
 817         struct winbindd_cli_state *state;
 818         struct fd_event *ev;
 819         fd_set r_fds, w_fds;
 820         int maxfd, listen_sock, listen_priv_sock, selret;
 821         struct timeval timeout, ev_timeout;
 822
 823         /* Open Sockets here to get stuff going ASAP */
 824         listen_sock = open_winbindd_socket();
 825         listen_priv_sock = open_winbindd_priv_socket();
 826
 827         if (listen_sock == -1 || listen_priv_sock == -1) {
 828                 perror("open_winbind_socket");
 829                 exit(1);
 830         }
 831
 832         /* We'll be doing this a lot */
 833
 834         /* Handle messages */
 835
 836         message_dispatch(winbind_messaging_context());
 837
 838         run_events(winbind_event_context(), 0, NULL, NULL);
 839
 840         /* refresh the trusted domain cache */
 841
 842         rescan_trusted_domains();
 843
 844         /* Initialise fd lists for select() */
 845
 846         maxfd = MAX(listen_sock, listen_priv_sock);
 847
 848         FD_ZERO(&r_fds);
 849         FD_ZERO(&w_fds);
 850         FD_SET(listen_sock, &r_fds);
 851         FD_SET(listen_priv_sock, &r_fds);
 852
 853         timeout.tv_sec = WINBINDD_ESTABLISH_LOOP;
 854         timeout.tv_usec = 0;
 855
 856         /* Check for any event timeouts. */
 857         if (get_timed_events_timeout(winbind_event_context(), &ev_timeout)) {
 858                 timeout = timeval_min(&timeout, &ev_timeout);
 859         }
 860
 861         /* Set up client readers and writers */
 862
 863         state = winbindd_client_list();
 864
 865         while (state) {
 866
 867                 struct winbindd_cli_state *next = state->next;
 868
 869                 /* Dispose of client connection if it is marked as
 870                    finished */
 871
 872                 if (state->finished)
 873                         remove_client(state);
 874
 875                 state = next;
 876         }
 877
 878         for (ev = fd_events; ev; ev = ev->next) {
 879                 if (ev->flags & EVENT_FD_READ) {
 880                         FD_SET(ev->fd, &r_fds);
 881                         maxfd = MAX(ev->fd, maxfd);
 882                 }
 883                 if (ev->flags & EVENT_FD_WRITE) {
 884                         FD_SET(ev->fd, &w_fds);
 885                         maxfd = MAX(ev->fd, maxfd);
 886                 }
 887         }
 888
 889         /* Call select */
 890
 891         selret = sys_select(maxfd + 1, &r_fds, &w_fds, NULL, &timeout);
 892
 893         if (selret == 0) {
 894                 goto no_fds_ready;
 895         }
 896
 897         if (selret == -1) {
 898                 if (errno == EINTR) {
 899                         goto no_fds_ready;
 900                 }
 901
 902                 /* Select error, something is badly wrong */
 903
 904                 perror("select");
 905                 exit(1);
 906         }
 907
 908         /* selret > 0 */
 909
 910         ev = fd_events;
 911         while (ev != NULL) {
 912                 struct fd_event *next = ev->next;
 913                 int flags = 0;
 914                 if (FD_ISSET(ev->fd, &r_fds))
 915                         flags |= EVENT_FD_READ;
 916                 if (FD_ISSET(ev->fd, &w_fds))
 917                         flags |= EVENT_FD_WRITE;
 918                 if (flags)
 919                         ev->handler(ev, flags);
 920                 ev = next;
 921         }
 922
 923         if (FD_ISSET(listen_sock, &r_fds)) {
 924                 while (winbindd_num_clients() >
 925                        WINBINDD_MAX_SIMULTANEOUS_CLIENTS - 1) {
 926                         DEBUG(5,("winbindd: Exceeding %d client "
 927                                  "connections, removing idle "
 928                                  "connection.\n",
 929                                  WINBINDD_MAX_SIMULTANEOUS_CLIENTS));
 930                         if (!remove_idle_client()) {
 931                                 DEBUG(0,("winbindd: Exceeding %d "
 932                                          "client connections, no idle "
 933                                          "connection found\n",
 934                                          WINBINDD_MAX_SIMULTANEOUS_CLIENTS));
 935                                 break;
 936                         }
 937                 }
 938                 /* new, non-privileged connection */
 939                 new_connection(listen_sock, False);
 940         }
 941
 942         if (FD_ISSET(listen_priv_sock, &r_fds)) {
 943                 while (winbindd_num_clients() >
 944                        WINBINDD_MAX_SIMULTANEOUS_CLIENTS - 1) {
 945                         DEBUG(5,("winbindd: Exceeding %d client "
 946                                  "connections, removing idle "
 947                                  "connection.\n",
 948                                  WINBINDD_MAX_SIMULTANEOUS_CLIENTS));
 949                         if (!remove_idle_client()) {
 950                                 DEBUG(0,("winbindd: Exceeding %d "
 951                                          "client connections, no idle "
 952                                          "connection found\n",
 953                                          WINBINDD_MAX_SIMULTANEOUS_CLIENTS));
 954                                 break;
 955                         }
 956                 }
 957                 /* new, privileged connection */
 958                 new_connection(listen_priv_sock, True);
 959         }
 960
 961  no_fds_ready:
 962
 963 #if 0
 964         winbindd_check_cache_size(time(NULL));
 965 #endif
 966
 967         /* Check signal handling things */
 968
 969         winbind_check_sigterm(true);
 970         winbind_check_sighup(NULL);
 971
 972         if (do_sigusr2) {
 973                 print_winbindd_status();
 974                 do_sigusr2 = False;
 975         }
 976
 977         if (do_sigchld) {
 978                 pid_t pid;
 979
 980                 do_sigchld = False;
 981
 982                 while ((pid = sys_waitpid(-1, NULL, WNOHANG)) > 0) {
 983                         winbind_child_died(pid);
 984                 }
 985         }
 986 }
 987
 988 /* Main function */
 989
 990 int main(int argc, char **argv, char **envp)
 991 {
 992         static bool is_daemon = False;
 993         static bool Fork = True;
 994         static bool log_stdout = False;
 995         static bool no_process_group = False;
 996         enum {
 997                 OPT_DAEMON = 1000,
 998                 OPT_FORK,
 999                 OPT_NO_PROCESS_GROUP,
1000                 OPT_LOG_STDOUT
1001         };
1002         struct poptOption long_options[] = {
1003                 POPT_AUTOHELP
1004                 { "stdout", 'S', POPT_ARG_NONE, NULL, OPT_LOG_STDOUT, "Log to stdout" },
1005                 { "foreground", 'F', POPT_ARG_NONE, NULL, OPT_FORK, "Daemon in foreground mode" },
1006                 { "no-process-group", 0, POPT_ARG_NONE, NULL, OPT_NO_PROCESS_GROUP, "Don't create a new process group" },
1007                 { "daemon", 'D', POPT_ARG_NONE, NULL, OPT_DAEMON, "Become a daemon (default)" },
1008                 { "interactive", 'i', POPT_ARG_NONE, NULL, 'i', "Interactive mode" },
1009                 { "no-caching", 'n', POPT_ARG_NONE, NULL, 'n', "Disable caching" },
1010                 POPT_COMMON_SAMBA
1011                 POPT_TABLEEND
1012         };
1013         poptContext pc;
1014         int opt;
1015         TALLOC_CTX *frame = talloc_stackframe();
1016
1017         /* glibc (?) likes to print "User defined signal 1" and exit if a
1018            SIGUSR[12] is received before a handler is installed */
1019
1020         CatchSignal(SIGUSR1, SIG_IGN);
1021         CatchSignal(SIGUSR2, SIG_IGN);
1022
1023         fault_setup((void (*)(void *))fault_quit );
1024         dump_core_setup("winbindd");
1025
1026         load_case_tables();
1027
1028         /* Initialise for running in non-root mode */
1029
1030         sec_init();
1031
1032         set_remote_machine_name("winbindd", False);
1033
1034         /* Set environment variable so we don't recursively call ourselves.
1035            This may also be useful interactively. */
1036
1037         if ( !winbind_off() ) {
1038                 DEBUG(0,("Failed to disable recusive winbindd calls.  Exiting.\n"));
1039                 exit(1);
1040         }
1041
1042         /* Initialise samba/rpc client stuff */
1043
1044         pc = poptGetContext("winbindd", argc, (const char **)argv, long_options, 0);
1045
1046         while ((opt = poptGetNextOpt(pc)) != -1) {
1047                 switch (opt) {
1048                         /* Don't become a daemon */
1049                 case OPT_DAEMON:
1050                         is_daemon = True;
1051                         break;
1052                 case 'i':
1053                         interactive = True;
1054                         log_stdout = True;
1055                         Fork = False;
1056                         break;
1057                 case OPT_FORK:
1058                         Fork = false;
1059                         break;
1060                 case OPT_NO_PROCESS_GROUP:
1061                         no_process_group = true;
1062                         break;
1063                 case OPT_LOG_STDOUT:
1064                         log_stdout = true;
1065                         break;
1066                 case 'n':
1067                         opt_nocache = true;
1068                         break;
1069                 default:
1070                         d_fprintf(stderr, "\nInvalid option %s: %s\n\n",
1071                                   poptBadOption(pc, 0), poptStrerror(opt));
1072                         poptPrintUsage(pc, stderr, 0);
1073                         exit(1);
1074                 }
1075         }
1076
1077         if (is_daemon && interactive) {
1078                 d_fprintf(stderr,"\nERROR: "
1079                           "Option -i|--interactive is not allowed together with -D|--daemon\n\n");
1080                 poptPrintUsage(pc, stderr, 0);
1081                 exit(1);
1082         }
1083
1084         if (log_stdout && Fork) {
1085                 d_fprintf(stderr, "\nERROR: "
1086                           "Can't log to stdout (-S) unless daemon is in foreground +(-F) or interactive (-i)\n\n");
1087                 poptPrintUsage(pc, stderr, 0);
1088                 exit(1);
1089         }
1090
1091         poptFreeContext(pc);
1092
1093         if (!override_logfile) {
1094                 char *logfile = NULL;
1095                 if (asprintf(&logfile,"%s/log.winbindd",
1096                                 get_dyn_LOGFILEBASE()) > 0) {
1097                         lp_set_logfile(logfile);
1098                         SAFE_FREE(logfile);
1099                 }
1100         }
1101         setup_logging("winbindd", log_stdout);
1102         reopen_logs();
1103
1104         DEBUG(0,("winbindd version %s started.\n", SAMBA_VERSION_STRING));
1105         DEBUGADD(0,("%s\n", COPYRIGHT_STARTUP_MESSAGE));
1106
1107         if (!lp_load_initial_only(get_dyn_CONFIGFILE())) {
1108                 DEBUG(0, ("error opening config file\n"));
1109                 exit(1);
1110         }
1111
1112         /* Initialise messaging system */
1113
1114         if (winbind_messaging_context() == NULL) {
1115                 exit(1);
1116         }
1117
1118         if (!reload_services_file(NULL)) {
1119                 DEBUG(0, ("error opening config file\n"));
1120                 exit(1);
1121         }
1122
1123         if (!directory_exist(lp_lockdir(), NULL)) {
1124                 mkdir(lp_lockdir(), 0755);
1125         }
1126
1127         /* Setup names. */
1128
1129         if (!init_names())
1130                 exit(1);
1131
1132         load_interfaces();
1133
1134         if (!secrets_init()) {
1135
1136                 DEBUG(0,("Could not initialize domain trust account secrets. Giving up\n"));
1137                 return False;
1138         }
1139
1140         /* Enable netbios namecache */
1141
1142         namecache_enable();
1143
1144         /* Unblock all signals we are interested in as they may have been
1145            blocked by the parent process. */
1146
1147         BlockSignals(False, SIGINT);
1148         BlockSignals(False, SIGQUIT);
1149         BlockSignals(False, SIGTERM);
1150         BlockSignals(False, SIGUSR1);
1151         BlockSignals(False, SIGUSR2);
1152         BlockSignals(False, SIGHUP);
1153         BlockSignals(False, SIGCHLD);
1154
1155         /* Setup signal handlers */
1156
1157         CatchSignal(SIGINT, termination_handler);      /* Exit on these sigs */
1158         CatchSignal(SIGQUIT, termination_handler);
1159         CatchSignal(SIGTERM, termination_handler);
1160         CatchSignal(SIGCHLD, sigchld_handler);
1161
1162         CatchSignal(SIGPIPE, SIG_IGN);                 /* Ignore sigpipe */
1163
1164         CatchSignal(SIGUSR2, sigusr2_handler);         /* Debugging sigs */
1165         CatchSignal(SIGHUP, sighup_handler);
1166
1167         if (!interactive)
1168                 become_daemon(Fork, no_process_group);
1169
1170         pidfile_create("winbindd");
1171
1172 #if HAVE_SETPGID
1173         /*
1174          * If we're interactive we want to set our own process group for
1175          * signal management.
1176          */
1177         if (interactive && !no_process_group)
1178                 setpgid( (pid_t)0, (pid_t)0);
1179 #endif
1180
1181         TimeInit();
1182
1183         if (!reinit_after_fork(winbind_messaging_context(), false)) {
1184                 DEBUG(0,("reinit_after_fork() failed\n"));
1185                 exit(1);
1186         }
1187
1188         /*
1189          * Ensure all cache and idmap caches are consistent
1190          * and initialized before we startup.
1191          */
1192         if (!winbindd_cache_validate_and_initialize()) {
1193                 exit(1);
1194         }
1195
1196         /* get broadcast messages */
1197         claim_connection(NULL,"",FLAG_MSG_GENERAL|FLAG_MSG_DBWRAP);
1198
1199         /* React on 'smbcontrol winbindd reload-config' in the same way
1200            as to SIGHUP signal */
1201         messaging_register(winbind_messaging_context(), NULL,
1202                            MSG_SMB_CONF_UPDATED, msg_reload_services);
1203         messaging_register(winbind_messaging_context(), NULL,
1204                            MSG_SHUTDOWN, msg_shutdown);
1205
1206         /* Handle online/offline messages. */
1207         messaging_register(winbind_messaging_context(), NULL,
1208                            MSG_WINBIND_OFFLINE, winbind_msg_offline);
1209         messaging_register(winbind_messaging_context(), NULL,
1210                            MSG_WINBIND_ONLINE, winbind_msg_online);
1211         messaging_register(winbind_messaging_context(), NULL,
1212                            MSG_WINBIND_ONLINESTATUS, winbind_msg_onlinestatus);
1213
1214         messaging_register(winbind_messaging_context(), NULL,
1215                            MSG_DUMP_EVENT_LIST, winbind_msg_dump_event_list);
1216
1217         messaging_register(winbind_messaging_context(), NULL,
1218                            MSG_WINBIND_VALIDATE_CACHE,
1219                            winbind_msg_validate_cache);
1220
1221         messaging_register(winbind_messaging_context(), NULL,
1222                            MSG_WINBIND_DUMP_DOMAIN_LIST,
1223                            winbind_msg_dump_domain_list);
1224
1225         /* Register handler for MSG_DEBUG. */
1226         messaging_register(winbind_messaging_context(), NULL,
1227                            MSG_DEBUG,
1228                            winbind_msg_debug);
1229
1230         netsamlogon_cache_init(); /* Non-critical */
1231
1232         /* clear the cached list of trusted domains */
1233
1234         wcache_tdc_clear();
1235
1236         if (!init_domain_list()) {
1237                 DEBUG(0,("unable to initialize domain list\n"));
1238                 exit(1);
1239         }
1240
1241         init_idmap_child();
1242         init_locator_child();
1243
1244         smb_nscd_flush_user_cache();
1245         smb_nscd_flush_group_cache();
1246
1247         /* Loop waiting for requests */
1248
1249         TALLOC_FREE(frame);
1250         while (1) {
1251                 frame = talloc_stackframe();
1252                 process_loop();
1253                 TALLOC_FREE(frame);
1254         }
1255
1256         return 0;
1257 }