source/nsswitch/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 2 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, write to the Free Software
  23    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  24 */
  25
  26 #include "includes.h"
  27 #include "winbindd.h"
  28
  29 #undef DBGC_CLASS
  30 #define DBGC_CLASS DBGC_WINBIND
  31
  32 BOOL opt_nocache = False;
  33 static BOOL interactive = False;
  34
  35 extern BOOL override_logfile;
  36
  37 struct event_context *winbind_event_context(void)
  38 {
  39         static struct event_context *ctx;
  40
  41         if (!ctx && !(ctx = event_context_init(NULL))) {
  42                 smb_panic("Could not init winbind event context\n");
  43         }
  44         return ctx;
  45 }
  46
  47 /* Reload configuration */
  48
  49 static BOOL reload_services_file(void)
  50 {
  51         BOOL ret;
  52
  53         if (lp_loaded()) {
  54                 pstring fname;
  55
  56                 pstrcpy(fname,lp_configfile());
  57                 if (file_exist(fname,NULL) && !strcsequal(fname,dyn_CONFIGFILE)) {
  58                         pstrcpy(dyn_CONFIGFILE,fname);
  59                 }
  60         }
  61
  62         reopen_logs();
  63         ret = lp_load(dyn_CONFIGFILE,False,False,True,True);
  64
  65         reopen_logs();
  66         load_interfaces();
  67
  68         return(ret);
  69 }
  70
  71
  72 /**************************************************************************** **
  73  Handle a fault..
  74  **************************************************************************** */
  75
  76 static void fault_quit(void)
  77 {
  78         dump_core();
  79 }
  80
  81 static void winbindd_status(void)
  82 {
  83         struct winbindd_cli_state *tmp;
  84
  85         DEBUG(0, ("winbindd status:\n"));
  86
  87         /* Print client state information */
  88
  89         DEBUG(0, ("\t%d clients currently active\n", winbindd_num_clients()));
  90
  91         if (DEBUGLEVEL >= 2 && winbindd_num_clients()) {
  92                 DEBUG(2, ("\tclient list:\n"));
  93                 for(tmp = winbindd_client_list(); tmp; tmp = tmp->next) {
  94                         DEBUGADD(2, ("\t\tpid %lu, sock %d\n",
  95                                   (unsigned long)tmp->pid, tmp->sock));
  96                 }
  97         }
  98 }
  99
 100 /* Print winbindd status to log file */
 101
 102 static void print_winbindd_status(void)
 103 {
 104         winbindd_status();
 105 }
 106
 107 /* Flush client cache */
 108
 109 static void flush_caches(void)
 110 {
 111         /* We need to invalidate cached user list entries on a SIGHUP
 112            otherwise cached access denied errors due to restrict anonymous
 113            hang around until the sequence number changes. */
 114
 115         wcache_invalidate_cache();
 116 }
 117
 118 /* Handle the signal by unlinking socket and exiting */
 119
 120 static void terminate(void)
 121 {
 122         pstring path;
 123
 124         /* Remove socket file */
 125         pstr_sprintf(path, "%s/%s",
 126                  WINBINDD_SOCKET_DIR, WINBINDD_SOCKET_NAME);
 127         unlink(path);
 128
 129         idmap_close();
 130
 131         trustdom_cache_shutdown();
 132
 133 #if 0
 134         if (interactive) {
 135                 TALLOC_CTX *mem_ctx = talloc_init("end_description");
 136                 char *description = talloc_describe_all(mem_ctx);
 137
 138                 DEBUG(3, ("tallocs left:\n%s\n", description));
 139                 talloc_destroy(mem_ctx);
 140         }
 141 #endif
 142
 143         exit(0);
 144 }
 145
 146 static BOOL do_sigterm;
 147
 148 static void termination_handler(int signum)
 149 {
 150         do_sigterm = True;
 151         sys_select_signal(signum);
 152 }
 153
 154 static BOOL do_sigusr2;
 155
 156 static void sigusr2_handler(int signum)
 157 {
 158         do_sigusr2 = True;
 159         sys_select_signal(SIGUSR2);
 160 }
 161
 162 static BOOL do_sighup;
 163
 164 static void sighup_handler(int signum)
 165 {
 166         do_sighup = True;
 167         sys_select_signal(SIGHUP);
 168 }
 169
 170 static BOOL do_sigchld;
 171
 172 static void sigchld_handler(int signum)
 173 {
 174         do_sigchld = True;
 175         sys_select_signal(SIGCHLD);
 176 }
 177
 178 /* React on 'smbcontrol winbindd reload-config' in the same way as on SIGHUP*/
 179 static void msg_reload_services(int msg_type, struct process_id src,
 180                                 void *buf, size_t len, void *private_data)
 181 {
 182         /* Flush various caches */
 183         flush_caches();
 184         reload_services_file();
 185 }
 186
 187 /* React on 'smbcontrol winbindd shutdown' in the same way as on SIGTERM*/
 188 static void msg_shutdown(int msg_type, struct process_id src,
 189                          void *buf, size_t len, void *private_data)
 190 {
 191         do_sigterm = True;
 192 }
 193
 194 static struct winbindd_dispatch_table {
 195         enum winbindd_cmd cmd;
 196         void (*fn)(struct winbindd_cli_state *state);
 197         const char *winbindd_cmd_name;
 198 } dispatch_table[] = {
 199
 200         /* User functions */
 201
 202         { WINBINDD_GETPWNAM, winbindd_getpwnam, "GETPWNAM" },
 203         { WINBINDD_GETPWUID, winbindd_getpwuid, "GETPWUID" },
 204
 205         { WINBINDD_SETPWENT, winbindd_setpwent, "SETPWENT" },
 206         { WINBINDD_ENDPWENT, winbindd_endpwent, "ENDPWENT" },
 207         { WINBINDD_GETPWENT, winbindd_getpwent, "GETPWENT" },
 208
 209         { WINBINDD_GETGROUPS, winbindd_getgroups, "GETGROUPS" },
 210         { WINBINDD_GETUSERSIDS, winbindd_getusersids, "GETUSERSIDS" },
 211         { WINBINDD_GETUSERDOMGROUPS, winbindd_getuserdomgroups,
 212           "GETUSERDOMGROUPS" },
 213
 214         /* Group functions */
 215
 216         { WINBINDD_GETGRNAM, winbindd_getgrnam, "GETGRNAM" },
 217         { WINBINDD_GETGRGID, winbindd_getgrgid, "GETGRGID" },
 218         { WINBINDD_SETGRENT, winbindd_setgrent, "SETGRENT" },
 219         { WINBINDD_ENDGRENT, winbindd_endgrent, "ENDGRENT" },
 220         { WINBINDD_GETGRENT, winbindd_getgrent, "GETGRENT" },
 221         { WINBINDD_GETGRLST, winbindd_getgrent, "GETGRLST" },
 222
 223         /* PAM auth functions */
 224
 225         { WINBINDD_PAM_AUTH, winbindd_pam_auth, "PAM_AUTH" },
 226         { WINBINDD_PAM_AUTH_CRAP, winbindd_pam_auth_crap, "AUTH_CRAP" },
 227         { WINBINDD_PAM_CHAUTHTOK, winbindd_pam_chauthtok, "CHAUTHTOK" },
 228         { WINBINDD_PAM_LOGOFF, winbindd_pam_logoff, "PAM_LOGOFF" },
 229         { WINBINDD_PAM_CHNG_PSWD_AUTH_CRAP, winbindd_pam_chng_pswd_auth_crap, "CHNG_PSWD_AUTH_CRAP" },
 230
 231         /* Enumeration functions */
 232
 233         { WINBINDD_LIST_USERS, winbindd_list_users, "LIST_USERS" },
 234         { WINBINDD_LIST_GROUPS, winbindd_list_groups, "LIST_GROUPS" },
 235         { WINBINDD_LIST_TRUSTDOM, winbindd_list_trusted_domains,
 236           "LIST_TRUSTDOM" },
 237         { WINBINDD_SHOW_SEQUENCE, winbindd_show_sequence, "SHOW_SEQUENCE" },
 238
 239         /* SID related functions */
 240
 241         { WINBINDD_LOOKUPSID, winbindd_lookupsid, "LOOKUPSID" },
 242         { WINBINDD_LOOKUPNAME, winbindd_lookupname, "LOOKUPNAME" },
 243         { WINBINDD_LOOKUPRIDS, winbindd_lookuprids, "LOOKUPRIDS" },
 244
 245         /* Lookup related functions */
 246
 247         { WINBINDD_SID_TO_UID, winbindd_sid_to_uid, "SID_TO_UID" },
 248         { WINBINDD_SID_TO_GID, winbindd_sid_to_gid, "SID_TO_GID" },
 249         { WINBINDD_UID_TO_SID, winbindd_uid_to_sid, "UID_TO_SID" },
 250         { WINBINDD_GID_TO_SID, winbindd_gid_to_sid, "GID_TO_SID" },
 251         { WINBINDD_SIDS_TO_XIDS, winbindd_sids_to_unixids, "SIDS_TO_XIDS" },
 252         { WINBINDD_ALLOCATE_UID, winbindd_allocate_uid, "ALLOCATE_UID" },
 253         { WINBINDD_ALLOCATE_GID, winbindd_allocate_gid, "ALLOCATE_GID" },
 254         { WINBINDD_SET_MAPPING, winbindd_set_mapping, "SET_MAPPING" },
 255         { WINBINDD_SET_HWM, winbindd_set_hwm, "SET_HWMS" },
 256
 257         /* Miscellaneous */
 258
 259         { WINBINDD_DUMP_MAPS, winbindd_dump_maps, "DUMP_MAPS" },
 260
 261         { WINBINDD_CHECK_MACHACC, winbindd_check_machine_acct, "CHECK_MACHACC" },
 262         { WINBINDD_PING, winbindd_ping, "PING" },
 263         { WINBINDD_INFO, winbindd_info, "INFO" },
 264         { WINBINDD_INTERFACE_VERSION, winbindd_interface_version,
 265           "INTERFACE_VERSION" },
 266         { WINBINDD_DOMAIN_NAME, winbindd_domain_name, "DOMAIN_NAME" },
 267         { WINBINDD_DOMAIN_INFO, winbindd_domain_info, "DOMAIN_INFO" },
 268         { WINBINDD_NETBIOS_NAME, winbindd_netbios_name, "NETBIOS_NAME" },
 269         { WINBINDD_PRIV_PIPE_DIR, winbindd_priv_pipe_dir,
 270           "WINBINDD_PRIV_PIPE_DIR" },
 271         { WINBINDD_GETDCNAME, winbindd_getdcname, "GETDCNAME" },
 272
 273         /* Credential cache access */
 274         { WINBINDD_CCACHE_NTLMAUTH, winbindd_ccache_ntlm_auth, "NTLMAUTH" },
 275
 276         /* WINS functions */
 277
 278         { WINBINDD_WINS_BYNAME, winbindd_wins_byname, "WINS_BYNAME" },
 279         { WINBINDD_WINS_BYIP, winbindd_wins_byip, "WINS_BYIP" },
 280
 281         /* End of list */
 282
 283         { WINBINDD_NUM_CMDS, NULL, "NONE" }
 284 };
 285
 286 static void process_request(struct winbindd_cli_state *state)
 287 {
 288         struct winbindd_dispatch_table *table = dispatch_table;
 289
 290         /* Free response data - we may be interrupted and receive another
 291            command before being able to send this data off. */
 292
 293         SAFE_FREE(state->response.extra_data.data);
 294
 295         ZERO_STRUCT(state->response);
 296
 297         state->response.result = WINBINDD_PENDING;
 298         state->response.length = sizeof(struct winbindd_response);
 299
 300         state->mem_ctx = talloc_init("winbind request");
 301         if (state->mem_ctx == NULL)
 302                 return;
 303
 304         /* Process command */
 305
 306         for (table = dispatch_table; table->fn; table++) {
 307                 if (state->request.cmd == table->cmd) {
 308                         DEBUG(10,("process_request: request fn %s\n",
 309                                   table->winbindd_cmd_name ));
 310                         table->fn(state);
 311                         break;
 312                 }
 313         }
 314
 315         if (!table->fn) {
 316                 DEBUG(10,("process_request: unknown request fn number %d\n",
 317                           (int)state->request.cmd ));
 318                 request_error(state);
 319         }
 320 }
 321
 322 /*
 323  * A list of file descriptors being monitored by select in the main processing
 324  * loop. fd_event->handler is called whenever the socket is readable/writable.
 325  */
 326
 327 static struct fd_event *fd_events = NULL;
 328
 329 void add_fd_event(struct fd_event *ev)
 330 {
 331         struct fd_event *match;
 332
 333         /* only add unique fd_event structs */
 334
 335         for (match=fd_events; match; match=match->next ) {
 336 #ifdef DEVELOPER
 337                 SMB_ASSERT( match != ev );
 338 #else
 339                 if ( match == ev )
 340                         return;
 341 #endif
 342         }
 343
 344         DLIST_ADD(fd_events, ev);
 345 }
 346
 347 void remove_fd_event(struct fd_event *ev)
 348 {
 349         DLIST_REMOVE(fd_events, ev);
 350 }
 351
 352 /*
 353  * Handler for fd_events to complete a read/write request, set up by
 354  * setup_async_read/setup_async_write.
 355  */
 356
 357 static void rw_callback(struct fd_event *event, int flags)
 358 {
 359         size_t todo;
 360         ssize_t done = 0;
 361
 362         todo = event->length - event->done;
 363
 364         if (event->flags & EVENT_FD_WRITE) {
 365                 SMB_ASSERT(flags == EVENT_FD_WRITE);
 366                 done = sys_write(event->fd,
 367                                  &((char *)event->data)[event->done],
 368                                  todo);
 369
 370                 if (done <= 0) {
 371                         event->flags = 0;
 372                         event->finished(event->private_data, False);
 373                         return;
 374                 }
 375         }
 376
 377         if (event->flags & EVENT_FD_READ) {
 378                 SMB_ASSERT(flags == EVENT_FD_READ);
 379                 done = sys_read(event->fd, &((char *)event->data)[event->done],
 380                                 todo);
 381
 382                 if (done <= 0) {
 383                         event->flags = 0;
 384                         event->finished(event->private_data, False);
 385                         return;
 386                 }
 387         }
 388
 389         event->done += done;
 390
 391         if (event->done == event->length) {
 392                 event->flags = 0;
 393                 event->finished(event->private_data, True);
 394         }
 395 }
 396
 397 /*
 398  * Request an async read/write on a fd_event structure. (*finished) is called
 399  * when the request is completed or an error had occurred.
 400  */
 401
 402 void setup_async_read(struct fd_event *event, void *data, size_t length,
 403                       void (*finished)(void *private_data, BOOL success),
 404                       void *private_data)
 405 {
 406         SMB_ASSERT(event->flags == 0);
 407         event->data = data;
 408         event->length = length;
 409         event->done = 0;
 410         event->handler = rw_callback;
 411         event->finished = finished;
 412         event->private_data = private_data;
 413         event->flags = EVENT_FD_READ;
 414 }
 415
 416 void setup_async_write(struct fd_event *event, void *data, size_t length,
 417                        void (*finished)(void *private_data, BOOL success),
 418                        void *private_data)
 419 {
 420         SMB_ASSERT(event->flags == 0);
 421         event->data = data;
 422         event->length = length;
 423         event->done = 0;
 424         event->handler = rw_callback;
 425         event->finished = finished;
 426         event->private_data = private_data;
 427         event->flags = EVENT_FD_WRITE;
 428 }
 429
 430 /*
 431  * This is the main event loop of winbind requests. It goes through a
 432  * state-machine of 3 read/write requests, 4 if you have extra data to send.
 433  *
 434  * An idle winbind client has a read request of 4 bytes outstanding,
 435  * finalizing function is request_len_recv, checking the length. request_recv
 436  * then processes the packet. The processing function then at some point has
 437  * to call request_finished which schedules sending the response.
 438  */
 439
 440 static void request_len_recv(void *private_data, BOOL success);
 441 static void request_recv(void *private_data, BOOL success);
 442 static void request_main_recv(void *private_data, BOOL success);
 443 static void request_finished(struct winbindd_cli_state *state);
 444 void request_finished_cont(void *private_data, BOOL success);
 445 static void response_main_sent(void *private_data, BOOL success);
 446 static void response_extra_sent(void *private_data, BOOL success);
 447
 448 static void response_extra_sent(void *private_data, BOOL success)
 449 {
 450         struct winbindd_cli_state *state =
 451                 talloc_get_type_abort(private_data, struct winbindd_cli_state);
 452
 453         if (state->mem_ctx != NULL) {
 454                 talloc_destroy(state->mem_ctx);
 455                 state->mem_ctx = NULL;
 456         }
 457
 458         if (!success) {
 459                 state->finished = True;
 460                 return;
 461         }
 462
 463         SAFE_FREE(state->request.extra_data.data);
 464         SAFE_FREE(state->response.extra_data.data);
 465
 466         setup_async_read(&state->fd_event, &state->request, sizeof(uint32),
 467                          request_len_recv, state);
 468 }
 469
 470 static void response_main_sent(void *private_data, BOOL success)
 471 {
 472         struct winbindd_cli_state *state =
 473                 talloc_get_type_abort(private_data, struct winbindd_cli_state);
 474
 475         if (!success) {
 476                 state->finished = True;
 477                 return;
 478         }
 479
 480         if (state->response.length == sizeof(state->response)) {
 481                 if (state->mem_ctx != NULL) {
 482                         talloc_destroy(state->mem_ctx);
 483                         state->mem_ctx = NULL;
 484                 }
 485
 486                 setup_async_read(&state->fd_event, &state->request,
 487                                  sizeof(uint32), request_len_recv, state);
 488                 return;
 489         }
 490
 491         setup_async_write(&state->fd_event, state->response.extra_data.data,
 492                           state->response.length - sizeof(state->response),
 493                           response_extra_sent, state);
 494 }
 495
 496 static void request_finished(struct winbindd_cli_state *state)
 497 {
 498         setup_async_write(&state->fd_event, &state->response,
 499                           sizeof(state->response), response_main_sent, state);
 500 }
 501
 502 void request_error(struct winbindd_cli_state *state)
 503 {
 504         SMB_ASSERT(state->response.result == WINBINDD_PENDING);
 505         state->response.result = WINBINDD_ERROR;
 506         request_finished(state);
 507 }
 508
 509 void request_ok(struct winbindd_cli_state *state)
 510 {
 511         SMB_ASSERT(state->response.result == WINBINDD_PENDING);
 512         state->response.result = WINBINDD_OK;
 513         request_finished(state);
 514 }
 515
 516 void request_finished_cont(void *private_data, BOOL success)
 517 {
 518         struct winbindd_cli_state *state =
 519                 talloc_get_type_abort(private_data, struct winbindd_cli_state);
 520
 521         if (success)
 522                 request_ok(state);
 523         else
 524                 request_error(state);
 525 }
 526
 527 static void request_len_recv(void *private_data, BOOL success)
 528 {
 529         struct winbindd_cli_state *state =
 530                 talloc_get_type_abort(private_data, struct winbindd_cli_state);
 531
 532         if (!success) {
 533                 state->finished = True;
 534                 return;
 535         }
 536
 537         if (*(uint32 *)(&state->request) != sizeof(state->request)) {
 538                 DEBUG(0,("request_len_recv: Invalid request size received: %d\n",
 539                          *(uint32 *)(&state->request)));
 540                 state->finished = True;
 541                 return;
 542         }
 543
 544         setup_async_read(&state->fd_event, (uint32 *)(&state->request)+1,
 545                          sizeof(state->request) - sizeof(uint32),
 546                          request_main_recv, state);
 547 }
 548
 549 static void request_main_recv(void *private_data, BOOL success)
 550 {
 551         struct winbindd_cli_state *state =
 552                 talloc_get_type_abort(private_data, struct winbindd_cli_state);
 553
 554         if (!success) {
 555                 state->finished = True;
 556                 return;
 557         }
 558
 559         if (state->request.extra_len == 0) {
 560                 state->request.extra_data.data = NULL;
 561                 request_recv(state, True);
 562                 return;
 563         }
 564
 565         if ((!state->privileged) &&
 566             (state->request.extra_len > WINBINDD_MAX_EXTRA_DATA)) {
 567                 DEBUG(3, ("Got request with %d bytes extra data on "
 568                           "unprivileged socket\n", (int)state->request.extra_len));
 569                 state->request.extra_data.data = NULL;
 570                 state->finished = True;
 571                 return;
 572         }
 573
 574         state->request.extra_data.data =
 575                 SMB_MALLOC_ARRAY(char, state->request.extra_len + 1);
 576
 577         if (state->request.extra_data.data == NULL) {
 578                 DEBUG(0, ("malloc failed\n"));
 579                 state->finished = True;
 580                 return;
 581         }
 582
 583         /* Ensure null termination */
 584         state->request.extra_data.data[state->request.extra_len] = '\0';
 585
 586         setup_async_read(&state->fd_event, state->request.extra_data.data,
 587                          state->request.extra_len, request_recv, state);
 588 }
 589
 590 static void request_recv(void *private_data, BOOL success)
 591 {
 592         struct winbindd_cli_state *state =
 593                 talloc_get_type_abort(private_data, struct winbindd_cli_state);
 594
 595         if (!success) {
 596                 state->finished = True;
 597                 return;
 598         }
 599
 600         process_request(state);
 601 }
 602
 603 /* Process a new connection by adding it to the client connection list */
 604
 605 static void new_connection(int listen_sock, BOOL privileged)
 606 {
 607         struct sockaddr_un sunaddr;
 608         struct winbindd_cli_state *state;
 609         socklen_t len;
 610         int sock;
 611
 612         /* Accept connection */
 613
 614         len = sizeof(sunaddr);
 615
 616         do {
 617                 sock = accept(listen_sock, (struct sockaddr *)&sunaddr, &len);
 618         } while (sock == -1 && errno == EINTR);
 619
 620         if (sock == -1)
 621                 return;
 622
 623         DEBUG(6,("accepted socket %d\n", sock));
 624
 625         /* Create new connection structure */
 626
 627         if ((state = TALLOC_ZERO_P(NULL, struct winbindd_cli_state)) == NULL) {
 628                 close(sock);
 629                 return;
 630         }
 631
 632         state->sock = sock;
 633
 634         state->last_access = time(NULL);
 635
 636         state->privileged = privileged;
 637
 638         state->fd_event.fd = state->sock;
 639         state->fd_event.flags = 0;
 640         add_fd_event(&state->fd_event);
 641
 642         setup_async_read(&state->fd_event, &state->request, sizeof(uint32),
 643                          request_len_recv, state);
 644
 645         /* Add to connection list */
 646
 647         winbindd_add_client(state);
 648 }
 649
 650 /* Remove a client connection from client connection list */
 651
 652 static void remove_client(struct winbindd_cli_state *state)
 653 {
 654         /* It's a dead client - hold a funeral */
 655
 656         if (state == NULL) {
 657                 return;
 658         }
 659
 660         /* Close socket */
 661
 662         close(state->sock);
 663
 664         /* Free any getent state */
 665
 666         free_getent_state(state->getpwent_state);
 667         free_getent_state(state->getgrent_state);
 668
 669         /* We may have some extra data that was not freed if the client was
 670            killed unexpectedly */
 671
 672         SAFE_FREE(state->response.extra_data.data);
 673
 674         if (state->mem_ctx != NULL) {
 675                 talloc_destroy(state->mem_ctx);
 676                 state->mem_ctx = NULL;
 677         }
 678
 679         remove_fd_event(&state->fd_event);
 680
 681         /* Remove from list and free */
 682
 683         winbindd_remove_client(state);
 684         TALLOC_FREE(state);
 685 }
 686
 687 /* Shutdown client connection which has been idle for the longest time */
 688
 689 static BOOL remove_idle_client(void)
 690 {
 691         struct winbindd_cli_state *state, *remove_state = NULL;
 692         time_t last_access = 0;
 693         int nidle = 0;
 694
 695         for (state = winbindd_client_list(); state; state = state->next) {
 696                 if (state->response.result != WINBINDD_PENDING &&
 697                     !state->getpwent_state && !state->getgrent_state) {
 698                         nidle++;
 699                         if (!last_access || state->last_access < last_access) {
 700                                 last_access = state->last_access;
 701                                 remove_state = state;
 702                         }
 703                 }
 704         }
 705
 706         if (remove_state) {
 707                 DEBUG(5,("Found %d idle client connections, shutting down sock %d, pid %u\n",
 708                         nidle, remove_state->sock, (unsigned int)remove_state->pid));
 709                 remove_client(remove_state);
 710                 return True;
 711         }
 712
 713         return False;
 714 }
 715
 716 /* Process incoming clients on listen_sock.  We use a tricky non-blocking,
 717    non-forking, non-threaded model which allows us to handle many
 718    simultaneous connections while remaining impervious to many denial of
 719    service attacks. */
 720
 721 static void process_loop(void)
 722 {
 723         struct winbindd_cli_state *state;
 724         struct fd_event *ev;
 725         fd_set r_fds, w_fds;
 726         int maxfd, listen_sock, listen_priv_sock, selret;
 727         struct timeval timeout, ev_timeout;
 728
 729         /* We'll be doing this a lot */
 730
 731         /* Handle messages */
 732
 733         message_dispatch();
 734
 735         run_events(winbind_event_context(), 0, NULL, NULL);
 736
 737         /* refresh the trusted domain cache */
 738
 739         rescan_trusted_domains();
 740
 741         /* Free up temporary memory */
 742
 743         lp_TALLOC_FREE();
 744         main_loop_TALLOC_FREE();
 745
 746         /* Initialise fd lists for select() */
 747
 748         listen_sock = open_winbindd_socket();
 749         listen_priv_sock = open_winbindd_priv_socket();
 750
 751         if (listen_sock == -1 || listen_priv_sock == -1) {
 752                 perror("open_winbind_socket");
 753                 exit(1);
 754         }
 755
 756         maxfd = MAX(listen_sock, listen_priv_sock);
 757
 758         FD_ZERO(&r_fds);
 759         FD_ZERO(&w_fds);
 760         FD_SET(listen_sock, &r_fds);
 761         FD_SET(listen_priv_sock, &r_fds);
 762
 763         timeout.tv_sec = WINBINDD_ESTABLISH_LOOP;
 764         timeout.tv_usec = 0;
 765
 766         /* Check for any event timeouts. */
 767         if (get_timed_events_timeout(winbind_event_context(), &ev_timeout)) {
 768                 timeout = timeval_min(&timeout, &ev_timeout);
 769         }
 770
 771         /* Set up client readers and writers */
 772
 773         state = winbindd_client_list();
 774
 775         while (state) {
 776
 777                 struct winbindd_cli_state *next = state->next;
 778
 779                 /* Dispose of client connection if it is marked as
 780                    finished */
 781
 782                 if (state->finished)
 783                         remove_client(state);
 784
 785                 state = next;
 786         }
 787
 788         for (ev = fd_events; ev; ev = ev->next) {
 789                 if (ev->flags & EVENT_FD_READ) {
 790                         FD_SET(ev->fd, &r_fds);
 791                         maxfd = MAX(ev->fd, maxfd);
 792                 }
 793                 if (ev->flags & EVENT_FD_WRITE) {
 794                         FD_SET(ev->fd, &w_fds);
 795                         maxfd = MAX(ev->fd, maxfd);
 796                 }
 797         }
 798
 799         /* Call select */
 800
 801         selret = sys_select(maxfd + 1, &r_fds, &w_fds, NULL, &timeout);
 802
 803         if (selret == 0) {
 804                 goto no_fds_ready;
 805         }
 806
 807         if (selret == -1) {
 808                 if (errno == EINTR) {
 809                         goto no_fds_ready;
 810                 }
 811
 812                 /* Select error, something is badly wrong */
 813
 814                 perror("select");
 815                 exit(1);
 816         }
 817
 818         /* selret > 0 */
 819
 820         ev = fd_events;
 821         while (ev != NULL) {
 822                 struct fd_event *next = ev->next;
 823                 int flags = 0;
 824                 if (FD_ISSET(ev->fd, &r_fds))
 825                         flags |= EVENT_FD_READ;
 826                 if (FD_ISSET(ev->fd, &w_fds))
 827                         flags |= EVENT_FD_WRITE;
 828                 if (flags)
 829                         ev->handler(ev, flags);
 830                 ev = next;
 831         }
 832
 833         if (FD_ISSET(listen_sock, &r_fds)) {
 834                 while (winbindd_num_clients() >
 835                        WINBINDD_MAX_SIMULTANEOUS_CLIENTS - 1) {
 836                         DEBUG(5,("winbindd: Exceeding %d client "
 837                                  "connections, removing idle "
 838                                  "connection.\n",
 839                                  WINBINDD_MAX_SIMULTANEOUS_CLIENTS));
 840                         if (!remove_idle_client()) {
 841                                 DEBUG(0,("winbindd: Exceeding %d "
 842                                          "client connections, no idle "
 843                                          "connection found\n",
 844                                          WINBINDD_MAX_SIMULTANEOUS_CLIENTS));
 845                                 break;
 846                         }
 847                 }
 848                 /* new, non-privileged connection */
 849                 new_connection(listen_sock, False);
 850         }
 851
 852         if (FD_ISSET(listen_priv_sock, &r_fds)) {
 853                 while (winbindd_num_clients() >
 854                        WINBINDD_MAX_SIMULTANEOUS_CLIENTS - 1) {
 855                         DEBUG(5,("winbindd: Exceeding %d client "
 856                                  "connections, removing idle "
 857                                  "connection.\n",
 858                                  WINBINDD_MAX_SIMULTANEOUS_CLIENTS));
 859                         if (!remove_idle_client()) {
 860                                 DEBUG(0,("winbindd: Exceeding %d "
 861                                          "client connections, no idle "
 862                                          "connection found\n",
 863                                          WINBINDD_MAX_SIMULTANEOUS_CLIENTS));
 864                                 break;
 865                         }
 866                 }
 867                 /* new, privileged connection */
 868                 new_connection(listen_priv_sock, True);
 869         }
 870
 871  no_fds_ready:
 872
 873 #if 0
 874         winbindd_check_cache_size(time(NULL));
 875 #endif
 876
 877         /* Check signal handling things */
 878
 879         if (do_sigterm)
 880                 terminate();
 881
 882         if (do_sighup) {
 883
 884                 DEBUG(3, ("got SIGHUP\n"));
 885
 886                 msg_reload_services(MSG_SMB_CONF_UPDATED, pid_to_procid(0), NULL, 0, NULL);
 887                 do_sighup = False;
 888         }
 889
 890         if (do_sigusr2) {
 891                 print_winbindd_status();
 892                 do_sigusr2 = False;
 893         }
 894
 895         if (do_sigchld) {
 896                 pid_t pid;
 897
 898                 do_sigchld = False;
 899
 900                 while ((pid = sys_waitpid(-1, NULL, WNOHANG)) > 0) {
 901                         winbind_child_died(pid);
 902                 }
 903         }
 904 }
 905
 906 /* Main function */
 907
 908 int main(int argc, char **argv, char **envp)
 909 {
 910         pstring logfile;
 911         static BOOL Fork = True;
 912         static BOOL log_stdout = False;
 913         static BOOL no_process_group = False;
 914         struct poptOption long_options[] = {
 915                 POPT_AUTOHELP
 916                 { "stdout", 'S', POPT_ARG_VAL, &log_stdout, True, "Log to stdout" },
 917                 { "foreground", 'F', POPT_ARG_VAL, &Fork, False, "Daemon in foreground mode" },
 918                 { "no-process-group", 0, POPT_ARG_VAL, &no_process_group, True, "Don't create a new process group" },
 919                 { "interactive", 'i', POPT_ARG_NONE, NULL, 'i', "Interactive mode" },
 920                 { "no-caching", 'n', POPT_ARG_VAL, &opt_nocache, True, "Disable caching" },
 921                 POPT_COMMON_SAMBA
 922                 POPT_TABLEEND
 923         };
 924         poptContext pc;
 925         int opt;
 926
 927         /* glibc (?) likes to print "User defined signal 1" and exit if a
 928            SIGUSR[12] is received before a handler is installed */
 929
 930         CatchSignal(SIGUSR1, SIG_IGN);
 931         CatchSignal(SIGUSR2, SIG_IGN);
 932
 933         fault_setup((void (*)(void *))fault_quit );
 934         dump_core_setup("winbindd");
 935
 936         load_case_tables();
 937
 938         /* Initialise for running in non-root mode */
 939
 940         sec_init();
 941
 942         set_remote_machine_name("winbindd", False);
 943
 944         /* Set environment variable so we don't recursively call ourselves.
 945            This may also be useful interactively. */
 946
 947         if ( !winbind_off() ) {
 948                 DEBUG(0,("Failed to disable recusive winbindd calls.  Exiting.\n"));
 949                 exit(1);
 950         }
 951
 952         /* Initialise samba/rpc client stuff */
 953
 954         pc = poptGetContext("winbindd", argc, (const char **)argv, long_options,
 955                                                 POPT_CONTEXT_KEEP_FIRST);
 956
 957         while ((opt = poptGetNextOpt(pc)) != -1) {
 958                 switch (opt) {
 959                         /* Don't become a daemon */
 960                 case 'i':
 961                         interactive = True;
 962                         log_stdout = True;
 963                         Fork = False;
 964                         break;
 965                 }
 966         }
 967
 968
 969         if (log_stdout && Fork) {
 970                 printf("Can't log to stdout (-S) unless daemon is in foreground +(-F) or interactive (-i)\n");
 971                 poptPrintUsage(pc, stderr, 0);
 972                 exit(1);
 973         }
 974
 975         if (!override_logfile) {
 976                 pstr_sprintf(logfile, "%s/log.winbindd", dyn_LOGFILEBASE);
 977                 lp_set_logfile(logfile);
 978         }
 979         setup_logging("winbindd", log_stdout);
 980         reopen_logs();
 981
 982         DEBUG(1, ("winbindd version %s started.\n%s\n",
 983                   SAMBA_VERSION_STRING,
 984                   COPYRIGHT_STARTUP_MESSAGE) );
 985
 986         if (!reload_services_file()) {
 987                 DEBUG(0, ("error opening config file\n"));
 988                 exit(1);
 989         }
 990
 991         if (!directory_exist(lp_lockdir(), NULL)) {
 992                 mkdir(lp_lockdir(), 0755);
 993         }
 994
 995         /* Setup names. */
 996
 997         if (!init_names())
 998                 exit(1);
 999
1000         load_interfaces();
1001
1002         if (!secrets_init()) {
1003
1004                 DEBUG(0,("Could not initialize domain trust account secrets. Giving up\n"));
1005                 return False;
1006         }
1007
1008         /* Enable netbios namecache */
1009
1010         namecache_enable();
1011
1012         /* Winbind daemon initialisation */
1013
1014         if ( ! NT_STATUS_IS_OK(idmap_init()) ) {
1015                 DEBUG(1, ("Could not init idmap! - Sid/[UG]id mapping will not be available\n"));
1016         }
1017
1018 #ifdef WITH_ADS
1019         nss_init( lp_winbind_nss_info() );
1020 #endif
1021
1022         /* Unblock all signals we are interested in as they may have been
1023            blocked by the parent process. */
1024
1025         BlockSignals(False, SIGINT);
1026         BlockSignals(False, SIGQUIT);
1027         BlockSignals(False, SIGTERM);
1028         BlockSignals(False, SIGUSR1);
1029         BlockSignals(False, SIGUSR2);
1030         BlockSignals(False, SIGHUP);
1031         BlockSignals(False, SIGCHLD);
1032
1033         /* Setup signal handlers */
1034
1035         CatchSignal(SIGINT, termination_handler);      /* Exit on these sigs */
1036         CatchSignal(SIGQUIT, termination_handler);
1037         CatchSignal(SIGTERM, termination_handler);
1038         CatchSignal(SIGCHLD, sigchld_handler);
1039
1040         CatchSignal(SIGPIPE, SIG_IGN);                 /* Ignore sigpipe */
1041
1042         CatchSignal(SIGUSR2, sigusr2_handler);         /* Debugging sigs */
1043         CatchSignal(SIGHUP, sighup_handler);
1044
1045         if (!interactive)
1046                 become_daemon(Fork, no_process_group);
1047
1048         pidfile_create("winbindd");
1049
1050 #if HAVE_SETPGID
1051         /*
1052          * If we're interactive we want to set our own process group for
1053          * signal management.
1054          */
1055         if (interactive && !no_process_group)
1056                 setpgid( (pid_t)0, (pid_t)0);
1057 #endif
1058
1059         TimeInit();
1060
1061         /* Initialise messaging system */
1062
1063         if (!message_init()) {
1064                 DEBUG(0, ("unable to initialize messaging system\n"));
1065                 exit(1);
1066         }
1067
1068         /* React on 'smbcontrol winbindd reload-config' in the same way
1069            as to SIGHUP signal */
1070         message_register(MSG_SMB_CONF_UPDATED, msg_reload_services, NULL);
1071         message_register(MSG_SHUTDOWN, msg_shutdown, NULL);
1072
1073         /* Handle online/offline messages. */
1074         message_register(MSG_WINBIND_OFFLINE, winbind_msg_offline, NULL);
1075         message_register(MSG_WINBIND_ONLINE, winbind_msg_online, NULL);
1076         message_register(MSG_WINBIND_ONLINESTATUS, winbind_msg_onlinestatus,
1077                          NULL);
1078
1079         poptFreeContext(pc);
1080
1081         netsamlogon_cache_init(); /* Non-critical */
1082
1083         if (!init_domain_list()) {
1084                 DEBUG(0,("unable to initalize domain list\n"));
1085                 exit(1);
1086         }
1087
1088         init_idmap_child();
1089
1090         smb_nscd_flush_user_cache();
1091         smb_nscd_flush_group_cache();
1092
1093         /* Loop waiting for requests */
1094
1095         while (1)
1096                 process_loop();
1097
1098         return 0;
1099 }