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    Copyright (C) James Peach 2007
  11
  12    This program is free software; you can redistribute it and/or modify
  13    it under the terms of the GNU General Public License as published by
  14    the Free Software Foundation; either version 2 of the License, or
  15    (at your option) any later version.
  16
  17    This program is distributed in the hope that it will be useful,
  18    but WITHOUT ANY WARRANTY; without even the implied warranty of
  19    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  20    GNU General Public License for more details.
  21
  22    You should have received a copy of the GNU General Public License
  23    along with this program; if not, write to the Free Software
  24    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  25 */
  26
  27 #include "includes.h"
  28 #include "winbindd.h"
  29
  30 #undef DBGC_CLASS
  31 #define DBGC_CLASS DBGC_WINBIND
  32
  33 BOOL opt_nocache = 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
 123         winbindd_release_sockets();
 124         idmap_close();
 125
 126         trustdom_cache_shutdown();
 127
 128 #if 0
 129         if (interactive) {
 130                 TALLOC_CTX *mem_ctx = talloc_init("end_description");
 131                 char *description = talloc_describe_all(mem_ctx);
 132
 133                 DEBUG(3, ("tallocs left:\n%s\n", description));
 134                 talloc_destroy(mem_ctx);
 135         }
 136 #endif
 137
 138         exit(0);
 139 }
 140
 141 static BOOL do_sigterm;
 142
 143 static void termination_handler(int signum)
 144 {
 145         do_sigterm = True;
 146         sys_select_signal(signum);
 147 }
 148
 149 static BOOL do_sigusr2;
 150
 151 static void sigusr2_handler(int signum)
 152 {
 153         do_sigusr2 = True;
 154         sys_select_signal(SIGUSR2);
 155 }
 156
 157 static BOOL do_sighup;
 158
 159 static void sighup_handler(int signum)
 160 {
 161         do_sighup = True;
 162         sys_select_signal(SIGHUP);
 163 }
 164
 165 static BOOL do_sigchld;
 166
 167 static void sigchld_handler(int signum)
 168 {
 169         do_sigchld = True;
 170         sys_select_signal(SIGCHLD);
 171 }
 172
 173 /* React on 'smbcontrol winbindd reload-config' in the same way as on SIGHUP*/
 174 static void msg_reload_services(int msg_type, struct process_id src,
 175                                 void *buf, size_t len, void *private_data)
 176 {
 177         /* Flush various caches */
 178         flush_caches();
 179         reload_services_file();
 180 }
 181
 182 /* React on 'smbcontrol winbindd shutdown' in the same way as on SIGTERM*/
 183 static void msg_shutdown(int msg_type, struct process_id src,
 184                          void *buf, size_t len, void *private_data)
 185 {
 186         do_sigterm = True;
 187 }
 188
 189 static struct winbindd_dispatch_table {
 190         enum winbindd_cmd cmd;
 191         void (*fn)(struct winbindd_cli_state *state);
 192         const char *winbindd_cmd_name;
 193 } dispatch_table[] = {
 194
 195         /* User functions */
 196
 197         { WINBINDD_GETPWNAM, winbindd_getpwnam, "GETPWNAM" },
 198         { WINBINDD_GETPWUID, winbindd_getpwuid, "GETPWUID" },
 199
 200         { WINBINDD_SETPWENT, winbindd_setpwent, "SETPWENT" },
 201         { WINBINDD_ENDPWENT, winbindd_endpwent, "ENDPWENT" },
 202         { WINBINDD_GETPWENT, winbindd_getpwent, "GETPWENT" },
 203
 204         { WINBINDD_GETGROUPS, winbindd_getgroups, "GETGROUPS" },
 205         { WINBINDD_GETUSERSIDS, winbindd_getusersids, "GETUSERSIDS" },
 206         { WINBINDD_GETUSERDOMGROUPS, winbindd_getuserdomgroups,
 207           "GETUSERDOMGROUPS" },
 208
 209         /* Group functions */
 210
 211         { WINBINDD_GETGRNAM, winbindd_getgrnam, "GETGRNAM" },
 212         { WINBINDD_GETGRGID, winbindd_getgrgid, "GETGRGID" },
 213         { WINBINDD_SETGRENT, winbindd_setgrent, "SETGRENT" },
 214         { WINBINDD_ENDGRENT, winbindd_endgrent, "ENDGRENT" },
 215         { WINBINDD_GETGRENT, winbindd_getgrent, "GETGRENT" },
 216         { WINBINDD_GETGRLST, winbindd_getgrent, "GETGRLST" },
 217
 218         /* PAM auth functions */
 219
 220         { WINBINDD_PAM_AUTH, winbindd_pam_auth, "PAM_AUTH" },
 221         { WINBINDD_PAM_AUTH_CRAP, winbindd_pam_auth_crap, "AUTH_CRAP" },
 222         { WINBINDD_PAM_CHAUTHTOK, winbindd_pam_chauthtok, "CHAUTHTOK" },
 223         { WINBINDD_PAM_LOGOFF, winbindd_pam_logoff, "PAM_LOGOFF" },
 224         { WINBINDD_PAM_CHNG_PSWD_AUTH_CRAP, winbindd_pam_chng_pswd_auth_crap, "CHNG_PSWD_AUTH_CRAP" },
 225
 226         /* Enumeration functions */
 227
 228         { WINBINDD_LIST_USERS, winbindd_list_users, "LIST_USERS" },
 229         { WINBINDD_LIST_GROUPS, winbindd_list_groups, "LIST_GROUPS" },
 230         { WINBINDD_LIST_TRUSTDOM, winbindd_list_trusted_domains,
 231           "LIST_TRUSTDOM" },
 232         { WINBINDD_SHOW_SEQUENCE, winbindd_show_sequence, "SHOW_SEQUENCE" },
 233
 234         /* SID related functions */
 235
 236         { WINBINDD_LOOKUPSID, winbindd_lookupsid, "LOOKUPSID" },
 237         { WINBINDD_LOOKUPNAME, winbindd_lookupname, "LOOKUPNAME" },
 238         { WINBINDD_LOOKUPRIDS, winbindd_lookuprids, "LOOKUPRIDS" },
 239
 240         /* Lookup related functions */
 241
 242         { WINBINDD_SID_TO_UID, winbindd_sid_to_uid, "SID_TO_UID" },
 243         { WINBINDD_SID_TO_GID, winbindd_sid_to_gid, "SID_TO_GID" },
 244         { WINBINDD_UID_TO_SID, winbindd_uid_to_sid, "UID_TO_SID" },
 245         { WINBINDD_GID_TO_SID, winbindd_gid_to_sid, "GID_TO_SID" },
 246 #if 0   /* DISABLED until we fix the interface in Samba 3.0.26 --jerry */
 247         { WINBINDD_SIDS_TO_XIDS, winbindd_sids_to_unixids, "SIDS_TO_XIDS" },
 248 #endif  /* end DISABLED */
 249         { WINBINDD_ALLOCATE_UID, winbindd_allocate_uid, "ALLOCATE_UID" },
 250         { WINBINDD_ALLOCATE_GID, winbindd_allocate_gid, "ALLOCATE_GID" },
 251         { WINBINDD_SET_MAPPING, winbindd_set_mapping, "SET_MAPPING" },
 252         { WINBINDD_SET_HWM, winbindd_set_hwm, "SET_HWMS" },
 253
 254         /* Miscellaneous */
 255
 256         { WINBINDD_DUMP_MAPS, winbindd_dump_maps, "DUMP_MAPS" },
 257
 258         { WINBINDD_CHECK_MACHACC, winbindd_check_machine_acct, "CHECK_MACHACC" },
 259         { WINBINDD_PING, winbindd_ping, "PING" },
 260         { WINBINDD_INFO, winbindd_info, "INFO" },
 261         { WINBINDD_INTERFACE_VERSION, winbindd_interface_version,
 262           "INTERFACE_VERSION" },
 263         { WINBINDD_DOMAIN_NAME, winbindd_domain_name, "DOMAIN_NAME" },
 264         { WINBINDD_DOMAIN_INFO, winbindd_domain_info, "DOMAIN_INFO" },
 265         { WINBINDD_NETBIOS_NAME, winbindd_netbios_name, "NETBIOS_NAME" },
 266         { WINBINDD_PRIV_PIPE_DIR, winbindd_priv_pipe_dir,
 267           "WINBINDD_PRIV_PIPE_DIR" },
 268         { WINBINDD_GETDCNAME, winbindd_getdcname, "GETDCNAME" },
 269
 270         /* Credential cache access */
 271         { WINBINDD_CCACHE_NTLMAUTH, winbindd_ccache_ntlm_auth, "NTLMAUTH" },
 272
 273         /* WINS functions */
 274
 275         { WINBINDD_WINS_BYNAME, winbindd_wins_byname, "WINS_BYNAME" },
 276         { WINBINDD_WINS_BYIP, winbindd_wins_byip, "WINS_BYIP" },
 277
 278         /* End of list */
 279
 280         { WINBINDD_NUM_CMDS, NULL, "NONE" }
 281 };
 282
 283 static void process_request(struct winbindd_cli_state *state)
 284 {
 285         struct winbindd_dispatch_table *table = dispatch_table;
 286
 287         /* Free response data - we may be interrupted and receive another
 288            command before being able to send this data off. */
 289
 290         SAFE_FREE(state->response.extra_data.data);
 291
 292         ZERO_STRUCT(state->response);
 293
 294         state->response.result = WINBINDD_PENDING;
 295         state->response.length = sizeof(struct winbindd_response);
 296
 297         state->mem_ctx = talloc_init("winbind request");
 298         if (state->mem_ctx == NULL)
 299                 return;
 300
 301         /* Process command */
 302
 303         for (table = dispatch_table; table->fn; table++) {
 304                 if (state->request.cmd == table->cmd) {
 305                         DEBUG(10,("process_request: request fn %s\n",
 306                                   table->winbindd_cmd_name ));
 307                         table->fn(state);
 308                         break;
 309                 }
 310         }
 311
 312         if (!table->fn) {
 313                 DEBUG(10,("process_request: unknown request fn number %d\n",
 314                           (int)state->request.cmd ));
 315                 request_error(state);
 316         }
 317 }
 318
 319 /*
 320  * A list of file descriptors being monitored by select in the main processing
 321  * loop. fd_event->handler is called whenever the socket is readable/writable.
 322  */
 323
 324 static struct fd_event *fd_events = NULL;
 325
 326 void add_fd_event(struct fd_event *ev)
 327 {
 328         struct fd_event *match;
 329
 330         /* only add unique fd_event structs */
 331
 332         for (match=fd_events; match; match=match->next ) {
 333 #ifdef DEVELOPER
 334                 SMB_ASSERT( match != ev );
 335 #else
 336                 if ( match == ev )
 337                         return;
 338 #endif
 339         }
 340
 341         DLIST_ADD(fd_events, ev);
 342 }
 343
 344 void remove_fd_event(struct fd_event *ev)
 345 {
 346         DLIST_REMOVE(fd_events, ev);
 347 }
 348
 349 /*
 350  * Handler for fd_events to complete a read/write request, set up by
 351  * setup_async_read/setup_async_write.
 352  */
 353
 354 static void rw_callback(struct fd_event *event, int flags)
 355 {
 356         size_t todo;
 357         ssize_t done = 0;
 358
 359         todo = event->length - event->done;
 360
 361         if (event->flags & EVENT_FD_WRITE) {
 362                 SMB_ASSERT(flags == EVENT_FD_WRITE);
 363                 done = sys_write(event->fd,
 364                                  &((char *)event->data)[event->done],
 365                                  todo);
 366
 367                 if (done <= 0) {
 368                         event->flags = 0;
 369                         event->finished(event->private_data, False);
 370                         return;
 371                 }
 372         }
 373
 374         if (event->flags & EVENT_FD_READ) {
 375                 SMB_ASSERT(flags == EVENT_FD_READ);
 376                 done = sys_read(event->fd, &((char *)event->data)[event->done],
 377                                 todo);
 378
 379                 if (done <= 0) {
 380                         event->flags = 0;
 381                         event->finished(event->private_data, False);
 382                         return;
 383                 }
 384         }
 385
 386         event->done += done;
 387
 388         if (event->done == event->length) {
 389                 event->flags = 0;
 390                 event->finished(event->private_data, True);
 391         }
 392 }
 393
 394 /*
 395  * Request an async read/write on a fd_event structure. (*finished) is called
 396  * when the request is completed or an error had occurred.
 397  */
 398
 399 void setup_async_read(struct fd_event *event, void *data, size_t length,
 400                       void (*finished)(void *private_data, BOOL success),
 401                       void *private_data)
 402 {
 403         SMB_ASSERT(event->flags == 0);
 404         event->data = data;
 405         event->length = length;
 406         event->done = 0;
 407         event->handler = rw_callback;
 408         event->finished = finished;
 409         event->private_data = private_data;
 410         event->flags = EVENT_FD_READ;
 411 }
 412
 413 void setup_async_write(struct fd_event *event, void *data, size_t length,
 414                        void (*finished)(void *private_data, BOOL success),
 415                        void *private_data)
 416 {
 417         SMB_ASSERT(event->flags == 0);
 418         event->data = data;
 419         event->length = length;
 420         event->done = 0;
 421         event->handler = rw_callback;
 422         event->finished = finished;
 423         event->private_data = private_data;
 424         event->flags = EVENT_FD_WRITE;
 425 }
 426
 427 /*
 428  * This is the main event loop of winbind requests. It goes through a
 429  * state-machine of 3 read/write requests, 4 if you have extra data to send.
 430  *
 431  * An idle winbind client has a read request of 4 bytes outstanding,
 432  * finalizing function is request_len_recv, checking the length. request_recv
 433  * then processes the packet. The processing function then at some point has
 434  * to call request_finished which schedules sending the response.
 435  */
 436
 437 static void request_len_recv(void *private_data, BOOL success);
 438 static void request_recv(void *private_data, BOOL success);
 439 static void request_main_recv(void *private_data, BOOL success);
 440 static void request_finished(struct winbindd_cli_state *state);
 441 void request_finished_cont(void *private_data, BOOL success);
 442 static void response_main_sent(void *private_data, BOOL success);
 443 static void response_extra_sent(void *private_data, BOOL success);
 444
 445 static void response_extra_sent(void *private_data, BOOL success)
 446 {
 447         struct winbindd_cli_state *state =
 448                 talloc_get_type_abort(private_data, struct winbindd_cli_state);
 449
 450         if (state->mem_ctx != NULL) {
 451                 talloc_destroy(state->mem_ctx);
 452                 state->mem_ctx = NULL;
 453         }
 454
 455         if (!success) {
 456                 state->finished = True;
 457                 return;
 458         }
 459
 460         SAFE_FREE(state->request.extra_data.data);
 461         SAFE_FREE(state->response.extra_data.data);
 462
 463         setup_async_read(&state->fd_event, &state->request, sizeof(uint32),
 464                          request_len_recv, state);
 465 }
 466
 467 static void response_main_sent(void *private_data, BOOL success)
 468 {
 469         struct winbindd_cli_state *state =
 470                 talloc_get_type_abort(private_data, struct winbindd_cli_state);
 471
 472         if (!success) {
 473                 state->finished = True;
 474                 return;
 475         }
 476
 477         if (state->response.length == sizeof(state->response)) {
 478                 if (state->mem_ctx != NULL) {
 479                         talloc_destroy(state->mem_ctx);
 480                         state->mem_ctx = NULL;
 481                 }
 482
 483                 setup_async_read(&state->fd_event, &state->request,
 484                                  sizeof(uint32), request_len_recv, state);
 485                 return;
 486         }
 487
 488         setup_async_write(&state->fd_event, state->response.extra_data.data,
 489                           state->response.length - sizeof(state->response),
 490                           response_extra_sent, state);
 491 }
 492
 493 static void request_finished(struct winbindd_cli_state *state)
 494 {
 495         setup_async_write(&state->fd_event, &state->response,
 496                           sizeof(state->response), response_main_sent, state);
 497 }
 498
 499 void request_error(struct winbindd_cli_state *state)
 500 {
 501         SMB_ASSERT(state->response.result == WINBINDD_PENDING);
 502         state->response.result = WINBINDD_ERROR;
 503         request_finished(state);
 504 }
 505
 506 void request_ok(struct winbindd_cli_state *state)
 507 {
 508         SMB_ASSERT(state->response.result == WINBINDD_PENDING);
 509         state->response.result = WINBINDD_OK;
 510         request_finished(state);
 511 }
 512
 513 void request_finished_cont(void *private_data, BOOL success)
 514 {
 515         struct winbindd_cli_state *state =
 516                 talloc_get_type_abort(private_data, struct winbindd_cli_state);
 517
 518         if (success)
 519                 request_ok(state);
 520         else
 521                 request_error(state);
 522 }
 523
 524 static void request_len_recv(void *private_data, BOOL success)
 525 {
 526         struct winbindd_cli_state *state =
 527                 talloc_get_type_abort(private_data, struct winbindd_cli_state);
 528
 529         if (!success) {
 530                 state->finished = True;
 531                 return;
 532         }
 533
 534         if (*(uint32 *)(&state->request) != sizeof(state->request)) {
 535                 DEBUG(0,("request_len_recv: Invalid request size received: %d\n",
 536                          *(uint32 *)(&state->request)));
 537                 state->finished = True;
 538                 return;
 539         }
 540
 541         setup_async_read(&state->fd_event, (uint32 *)(&state->request)+1,
 542                          sizeof(state->request) - sizeof(uint32),
 543                          request_main_recv, state);
 544 }
 545
 546 static void request_main_recv(void *private_data, BOOL success)
 547 {
 548         struct winbindd_cli_state *state =
 549                 talloc_get_type_abort(private_data, struct winbindd_cli_state);
 550
 551         if (!success) {
 552                 state->finished = True;
 553                 return;
 554         }
 555
 556         if (state->request.extra_len == 0) {
 557                 state->request.extra_data.data = NULL;
 558                 request_recv(state, True);
 559                 return;
 560         }
 561
 562         if ((!state->privileged) &&
 563             (state->request.extra_len > WINBINDD_MAX_EXTRA_DATA)) {
 564                 DEBUG(3, ("Got request with %d bytes extra data on "
 565                           "unprivileged socket\n", (int)state->request.extra_len));
 566                 state->request.extra_data.data = NULL;
 567                 state->finished = True;
 568                 return;
 569         }
 570
 571         state->request.extra_data.data =
 572                 SMB_MALLOC_ARRAY(char, state->request.extra_len + 1);
 573
 574         if (state->request.extra_data.data == NULL) {
 575                 DEBUG(0, ("malloc failed\n"));
 576                 state->finished = True;
 577                 return;
 578         }
 579
 580         /* Ensure null termination */
 581         state->request.extra_data.data[state->request.extra_len] = '\0';
 582
 583         setup_async_read(&state->fd_event, state->request.extra_data.data,
 584                          state->request.extra_len, request_recv, state);
 585 }
 586
 587 static void request_recv(void *private_data, BOOL success)
 588 {
 589         struct winbindd_cli_state *state =
 590                 talloc_get_type_abort(private_data, struct winbindd_cli_state);
 591
 592         if (!success) {
 593                 state->finished = True;
 594                 return;
 595         }
 596
 597         process_request(state);
 598 }
 599
 600 /* Process a new connection by adding it to the client connection list */
 601
 602 static void new_connection(int listen_sock, BOOL privileged)
 603 {
 604         struct sockaddr_un sunaddr;
 605         struct winbindd_cli_state *state;
 606         socklen_t len;
 607         int sock;
 608
 609         /* Accept connection */
 610
 611         len = sizeof(sunaddr);
 612
 613         do {
 614                 sock = accept(listen_sock, (struct sockaddr *)&sunaddr, &len);
 615         } while (sock == -1 && errno == EINTR);
 616
 617         if (sock == -1)
 618                 return;
 619
 620         DEBUG(6,("accepted socket %d\n", sock));
 621
 622         /* Create new connection structure */
 623
 624         if ((state = TALLOC_ZERO_P(NULL, struct winbindd_cli_state)) == NULL) {
 625                 close(sock);
 626                 return;
 627         }
 628
 629         state->sock = sock;
 630
 631         state->last_access = time(NULL);
 632
 633         state->privileged = privileged;
 634
 635         state->fd_event.fd = state->sock;
 636         state->fd_event.flags = 0;
 637         add_fd_event(&state->fd_event);
 638
 639         setup_async_read(&state->fd_event, &state->request, sizeof(uint32),
 640                          request_len_recv, state);
 641
 642         /* Add to connection list */
 643
 644         winbindd_add_client(state);
 645 }
 646
 647 /* Remove a client connection from client connection list */
 648
 649 static void remove_client(struct winbindd_cli_state *state)
 650 {
 651         /* It's a dead client - hold a funeral */
 652
 653         if (state == NULL) {
 654                 return;
 655         }
 656
 657         /* Close socket */
 658
 659         close(state->sock);
 660
 661         /* Free any getent state */
 662
 663         free_getent_state(state->getpwent_state);
 664         free_getent_state(state->getgrent_state);
 665
 666         /* We may have some extra data that was not freed if the client was
 667            killed unexpectedly */
 668
 669         SAFE_FREE(state->response.extra_data.data);
 670
 671         if (state->mem_ctx != NULL) {
 672                 talloc_destroy(state->mem_ctx);
 673                 state->mem_ctx = NULL;
 674         }
 675
 676         remove_fd_event(&state->fd_event);
 677
 678         /* Remove from list and free */
 679
 680         winbindd_remove_client(state);
 681         TALLOC_FREE(state);
 682 }
 683
 684 /* Shutdown client connection which has been idle for the longest time */
 685
 686 static BOOL remove_idle_client(void)
 687 {
 688         struct winbindd_cli_state *state, *remove_state = NULL;
 689         time_t last_access = 0;
 690         int nidle = 0;
 691
 692         for (state = winbindd_client_list(); state; state = state->next) {
 693                 if (state->response.result != WINBINDD_PENDING &&
 694                     !state->getpwent_state && !state->getgrent_state) {
 695                         nidle++;
 696                         if (!last_access || state->last_access < last_access) {
 697                                 last_access = state->last_access;
 698                                 remove_state = state;
 699                         }
 700                 }
 701         }
 702
 703         if (remove_state) {
 704                 DEBUG(5,("Found %d idle client connections, shutting down sock %d, pid %u\n",
 705                         nidle, remove_state->sock, (unsigned int)remove_state->pid));
 706                 remove_client(remove_state);
 707                 return True;
 708         }
 709
 710         return False;
 711 }
 712
 713 /* Process incoming clients on listen_sock.  We use a tricky non-blocking,
 714    non-forking, non-threaded model which allows us to handle many
 715    simultaneous connections while remaining impervious to many denial of
 716    service attacks. */
 717
 718 static int process_loop(int listen_sock, int listen_priv_sock)
 719 {
 720         struct winbindd_cli_state *state;
 721         struct fd_event *ev;
 722         fd_set r_fds, w_fds;
 723         int maxfd, selret;
 724         struct timeval timeout, ev_timeout;
 725
 726         /* We'll be doing this a lot */
 727
 728         /* Handle messages */
 729
 730         message_dispatch();
 731
 732         run_events(winbind_event_context(), 0, NULL, NULL);
 733
 734         /* refresh the trusted domain cache */
 735
 736         rescan_trusted_domains();
 737
 738         /* Free up temporary memory */
 739
 740         lp_TALLOC_FREE();
 741         main_loop_TALLOC_FREE();
 742
 743         /* Initialise fd lists for select() */
 744
 745         maxfd = MAX(listen_sock, listen_priv_sock);
 746
 747         FD_ZERO(&r_fds);
 748         FD_ZERO(&w_fds);
 749         FD_SET(listen_sock, &r_fds);
 750         FD_SET(listen_priv_sock, &r_fds);
 751
 752         timeout.tv_sec = WINBINDD_ESTABLISH_LOOP;
 753         timeout.tv_usec = 0;
 754
 755         /* Check for any event timeouts. */
 756         if (get_timed_events_timeout(winbind_event_context(), &ev_timeout)) {
 757                 timeout = timeval_min(&timeout, &ev_timeout);
 758         }
 759
 760         /* Set up client readers and writers */
 761
 762         state = winbindd_client_list();
 763
 764         while (state) {
 765
 766                 struct winbindd_cli_state *next = state->next;
 767
 768                 /* Dispose of client connection if it is marked as
 769                    finished */
 770
 771                 if (state->finished)
 772                         remove_client(state);
 773
 774                 state = next;
 775         }
 776
 777         for (ev = fd_events; ev; ev = ev->next) {
 778                 if (ev->flags & EVENT_FD_READ) {
 779                         FD_SET(ev->fd, &r_fds);
 780                         maxfd = MAX(ev->fd, maxfd);
 781                 }
 782                 if (ev->flags & EVENT_FD_WRITE) {
 783                         FD_SET(ev->fd, &w_fds);
 784                         maxfd = MAX(ev->fd, maxfd);
 785                 }
 786         }
 787
 788         /* Call select */
 789
 790         selret = sys_select(maxfd + 1, &r_fds, &w_fds, NULL, &timeout);
 791
 792         if (selret == 0) {
 793                 goto no_fds_ready;
 794         }
 795
 796         if (selret == -1) {
 797                 if (errno == EINTR) {
 798                         goto no_fds_ready;
 799                 }
 800
 801                 /* Select error, something is badly wrong */
 802
 803                 perror("select");
 804                 exit(1);
 805         }
 806
 807         /* selret > 0 */
 808
 809         ev = fd_events;
 810         while (ev != NULL) {
 811                 struct fd_event *next = ev->next;
 812                 int flags = 0;
 813                 if (FD_ISSET(ev->fd, &r_fds))
 814                         flags |= EVENT_FD_READ;
 815                 if (FD_ISSET(ev->fd, &w_fds))
 816                         flags |= EVENT_FD_WRITE;
 817                 if (flags)
 818                         ev->handler(ev, flags);
 819                 ev = next;
 820         }
 821
 822         if (FD_ISSET(listen_sock, &r_fds)) {
 823                 while (winbindd_num_clients() >
 824                        WINBINDD_MAX_SIMULTANEOUS_CLIENTS - 1) {
 825                         DEBUG(5,("winbindd: Exceeding %d client "
 826                                  "connections, removing idle "
 827                                  "connection.\n",
 828                                  WINBINDD_MAX_SIMULTANEOUS_CLIENTS));
 829                         if (!remove_idle_client()) {
 830                                 DEBUG(0,("winbindd: Exceeding %d "
 831                                          "client connections, no idle "
 832                                          "connection found\n",
 833                                          WINBINDD_MAX_SIMULTANEOUS_CLIENTS));
 834                                 break;
 835                         }
 836                 }
 837                 /* new, non-privileged connection */
 838                 new_connection(listen_sock, False);
 839         }
 840
 841         if (FD_ISSET(listen_priv_sock, &r_fds)) {
 842                 while (winbindd_num_clients() >
 843                        WINBINDD_MAX_SIMULTANEOUS_CLIENTS - 1) {
 844                         DEBUG(5,("winbindd: Exceeding %d client "
 845                                  "connections, removing idle "
 846                                  "connection.\n",
 847                                  WINBINDD_MAX_SIMULTANEOUS_CLIENTS));
 848                         if (!remove_idle_client()) {
 849                                 DEBUG(0,("winbindd: Exceeding %d "
 850                                          "client connections, no idle "
 851                                          "connection found\n",
 852                                          WINBINDD_MAX_SIMULTANEOUS_CLIENTS));
 853                                 break;
 854                         }
 855                 }
 856                 /* new, privileged connection */
 857                 new_connection(listen_priv_sock, True);
 858         }
 859
 860  no_fds_ready:
 861
 862 #if 0
 863         winbindd_check_cache_size(time(NULL));
 864 #endif
 865
 866         /* Check signal handling things */
 867
 868         if (do_sigterm)
 869                 terminate();
 870
 871         if (do_sighup) {
 872
 873                 DEBUG(3, ("got SIGHUP\n"));
 874
 875                 msg_reload_services(MSG_SMB_CONF_UPDATED, pid_to_procid(0), NULL, 0, NULL);
 876                 do_sighup = False;
 877         }
 878
 879         if (do_sigusr2) {
 880                 print_winbindd_status();
 881                 do_sigusr2 = False;
 882         }
 883
 884         if (do_sigchld) {
 885                 pid_t pid;
 886
 887                 do_sigchld = False;
 888
 889                 while ((pid = sys_waitpid(-1, NULL, WNOHANG)) > 0) {
 890                         winbind_child_died(pid);
 891                 }
 892         }
 893
 894
 895         return winbindd_num_clients();
 896 }
 897
 898 static void winbindd_process_loop(enum smb_server_mode server_mode)
 899 {
 900         int idle_timeout_sec;
 901         struct timeval starttime;
 902         int listen_public, listen_priv;
 903
 904         errno = 0;
 905         if (!winbindd_init_sockets(&listen_public, &listen_priv,
 906                                     &idle_timeout_sec)) {
 907                 terminate();
 908         }
 909
 910         starttime = timeval_current();
 911
 912         if (listen_public == -1 || listen_priv == -1) {
 913                 DEBUG(0, ("failed to open winbindd pipes: %s\n",
 914                             errno ? strerror(errno) : "unknown error"));
 915                 terminate();
 916         }
 917
 918         for (;;) {
 919                 int clients = process_loop(listen_public, listen_priv);
 920
 921                 /* Don't bother figuring out the idle time if we won't be
 922                  * timing out anyway.
 923                  */
 924                 if (idle_timeout_sec < 0) {
 925                         continue;
 926                 }
 927
 928                 if (clients == 0 && server_mode == SERVER_MODE_FOREGROUND) {
 929                         struct timeval now;
 930
 931                         now = timeval_current();
 932                         if (timeval_elapsed2(&starttime, &now) >
 933                                 (double)idle_timeout_sec) {
 934                                 DEBUG(0, ("idle for %d secs, exitting\n",
 935                                             idle_timeout_sec));
 936                                 terminate();
 937                         }
 938                 } else {
 939                         starttime = timeval_current();
 940                 }
 941         }
 942 }
 943
 944 /* Main function */
 945
 946 int main(int argc, char **argv, char **envp)
 947 {
 948         pstring logfile;
 949         BOOL log_stdout = False;
 950         BOOL no_process_group = False;
 951
 952         enum smb_server_mode server_mode = SERVER_MODE_DAEMON;
 953
 954         struct poptOption long_options[] = {
 955                 POPT_AUTOHELP
 956                 { "stdout", 'S', POPT_ARG_VAL, &log_stdout, True, "Log to stdout" },
 957                 { "foreground", 'F', POPT_ARG_VAL, &server_mode, SERVER_MODE_FOREGROUND, "Daemon in foreground mode" },
 958                 { "no-process-group", 0, POPT_ARG_VAL, &no_process_group, True, "Don't create a new process group" },
 959                 { "interactive", 'i', POPT_ARG_VAL, &server_mode, SERVER_MODE_INTERACTIVE, "Interactive mode" },
 960                 { "no-caching", 'n', POPT_ARG_VAL, &opt_nocache, True, "Disable caching" },
 961                 POPT_COMMON_SAMBA
 962                 POPT_TABLEEND
 963         };
 964         poptContext pc;
 965         int opt;
 966
 967         /* glibc (?) likes to print "User defined signal 1" and exit if a
 968            SIGUSR[12] is received before a handler is installed */
 969
 970         CatchSignal(SIGUSR1, SIG_IGN);
 971         CatchSignal(SIGUSR2, SIG_IGN);
 972
 973         fault_setup((void (*)(void *))fault_quit );
 974         dump_core_setup("winbindd");
 975
 976         load_case_tables();
 977
 978         /* Initialise for running in non-root mode */
 979
 980         sec_init();
 981
 982         set_remote_machine_name("winbindd", False);
 983
 984         /* Set environment variable so we don't recursively call ourselves.
 985            This may also be useful interactively. */
 986
 987         if ( !winbind_off() ) {
 988                 DEBUG(0,("Failed to disable recusive winbindd calls.  Exiting.\n"));
 989                 exit(1);
 990         }
 991
 992         /* Initialise samba/rpc client stuff */
 993
 994         pc = poptGetContext("winbindd", argc, (const char **)argv, long_options,
 995                                                 POPT_CONTEXT_KEEP_FIRST);
 996
 997         while ((opt = poptGetNextOpt(pc)) != -1) {}
 998
 999         if (server_mode == SERVER_MODE_INTERACTIVE) {
1000                 log_stdout = True;
1001                 if (DEBUGLEVEL >= 9) {
1002                         talloc_enable_leak_report();
1003                 }
1004         }
1005
1006         if (log_stdout && server_mode == SERVER_MODE_DAEMON) {
1007                 printf("Can't log to stdout (-S) unless daemon is in foreground (-F) or interactive (-i)\n");
1008                 poptPrintUsage(pc, stderr, 0);
1009                 exit(1);
1010         }
1011
1012         if (!override_logfile) {
1013                 pstr_sprintf(logfile, "%s/log.winbindd", dyn_LOGFILEBASE);
1014                 lp_set_logfile(logfile);
1015         }
1016         setup_logging("winbindd", log_stdout);
1017         reopen_logs();
1018
1019         DEBUG(1, ("winbindd version %s started.\n%s\n",
1020                   SAMBA_VERSION_STRING,
1021                   COPYRIGHT_STARTUP_MESSAGE) );
1022
1023         if (!reload_services_file()) {
1024                 DEBUG(0, ("error opening config file\n"));
1025                 exit(1);
1026         }
1027
1028         if (!directory_exist(lp_lockdir(), NULL)) {
1029                 mkdir(lp_lockdir(), 0755);
1030         }
1031
1032         /* Setup names. */
1033
1034         if (!init_names())
1035                 exit(1);
1036
1037         load_interfaces();
1038
1039         if (!secrets_init()) {
1040
1041                 DEBUG(0,("Could not initialize domain trust account secrets. Giving up\n"));
1042                 return False;
1043         }
1044
1045         /* Enable netbios namecache */
1046
1047         namecache_enable();
1048
1049         /* Winbind daemon initialisation */
1050
1051         if ( ! NT_STATUS_IS_OK(idmap_init_cache()) ) {
1052                 DEBUG(1, ("Could not init idmap cache!\n"));
1053         }
1054
1055         /* Unblock all signals we are interested in as they may have been
1056            blocked by the parent process. */
1057
1058         BlockSignals(False, SIGINT);
1059         BlockSignals(False, SIGQUIT);
1060         BlockSignals(False, SIGTERM);
1061         BlockSignals(False, SIGUSR1);
1062         BlockSignals(False, SIGUSR2);
1063         BlockSignals(False, SIGHUP);
1064         BlockSignals(False, SIGCHLD);
1065
1066         /* Setup signal handlers */
1067
1068         CatchSignal(SIGINT, termination_handler);      /* Exit on these sigs */
1069         CatchSignal(SIGQUIT, termination_handler);
1070         CatchSignal(SIGTERM, termination_handler);
1071         CatchSignal(SIGCHLD, sigchld_handler);
1072
1073         CatchSignal(SIGPIPE, SIG_IGN);                 /* Ignore sigpipe */
1074
1075         CatchSignal(SIGUSR2, sigusr2_handler);         /* Debugging sigs */
1076         CatchSignal(SIGHUP, sighup_handler);
1077
1078         if (server_mode == SERVER_MODE_DAEMON) {
1079                 DEBUG( 3, ( "Becoming a daemon.\n" ) );
1080                 become_daemon(True, no_process_group);
1081         } else if (server_mode == SERVER_MODE_FOREGROUND) {
1082                 become_daemon(False, no_process_group);
1083         }
1084
1085         pidfile_create("winbindd");
1086
1087 #if 0   /* not finished yet */
1088         /* Ensure all cache and idmap caches are consistent
1089            before we startup. */
1090
1091         if (winbindd_validate_cache()) {
1092                 /* We have a bad cache, but luckily we
1093                    just deleted it. Restart ourselves */
1094                 int i;
1095                 /* Ensure we have no open low fd's. */
1096                 for (i = 3; i < 100; i++) {
1097                         close(i);
1098                 }
1099                 return execve(argv[0], argv, envp);
1100         }
1101 #endif
1102
1103 #if HAVE_SETPGID
1104         /*
1105          * If we're interactive we want to set our own process group for
1106          * signal management.
1107          */
1108         if (server_mode == SERVER_MODE_INTERACTIVE && !no_process_group) {
1109                 setpgid( (pid_t)0, (pid_t)0);
1110         }
1111 #endif
1112
1113         TimeInit();
1114
1115         /* Initialise messaging system */
1116
1117         if (!message_init()) {
1118                 DEBUG(0, ("unable to initialize messaging system\n"));
1119                 exit(1);
1120         }
1121
1122         /* Initialize cache (ensure version is correct). */
1123         if (!initialize_winbindd_cache()) {
1124                 exit(1);
1125         }
1126
1127         /* React on 'smbcontrol winbindd reload-config' in the same way
1128            as to SIGHUP signal */
1129         message_register(MSG_SMB_CONF_UPDATED, msg_reload_services, NULL);
1130         message_register(MSG_SHUTDOWN, msg_shutdown, NULL);
1131
1132         /* Handle online/offline messages. */
1133         message_register(MSG_WINBIND_OFFLINE, winbind_msg_offline, NULL);
1134         message_register(MSG_WINBIND_ONLINE, winbind_msg_online, NULL);
1135         message_register(MSG_WINBIND_ONLINESTATUS, winbind_msg_onlinestatus,
1136                          NULL);
1137
1138         poptFreeContext(pc);
1139
1140         netsamlogon_cache_init(); /* Non-critical */
1141
1142         /* clear the cached list of trusted domains */
1143
1144         wcache_tdc_clear();
1145
1146         if (!init_domain_list()) {
1147                 DEBUG(0,("unable to initalize domain list\n"));
1148                 exit(1);
1149         }
1150
1151         init_idmap_child();
1152
1153         smb_nscd_flush_user_cache();
1154         smb_nscd_flush_group_cache();
1155
1156         /* Loop waiting for requests */
1157         winbindd_process_loop(server_mode);
1158
1159         return 0;
1160 }