source3/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 struct messaging_context *winbind_messaging_context(void)
  48 {
  49         static struct messaging_context *ctx;
  50
  51         if (!ctx && !(ctx = messaging_init(NULL, server_id_self(),
  52                                            winbind_event_context()))) {
  53                 smb_panic("Could not init winbind messaging context\n");
  54         }
  55         return ctx;
  56 }
  57
  58 /* Reload configuration */
  59
  60 static BOOL reload_services_file(void)
  61 {
  62         BOOL ret;
  63
  64         if (lp_loaded()) {
  65                 pstring fname;
  66
  67                 pstrcpy(fname,lp_configfile());
  68                 if (file_exist(fname,NULL) && !strcsequal(fname,dyn_CONFIGFILE)) {
  69                         pstrcpy(dyn_CONFIGFILE,fname);
  70                 }
  71         }
  72
  73         reopen_logs();
  74         ret = lp_load(dyn_CONFIGFILE,False,False,True,True);
  75
  76         reopen_logs();
  77         load_interfaces();
  78
  79         return(ret);
  80 }
  81
  82
  83 /**************************************************************************** **
  84  Handle a fault..
  85  **************************************************************************** */
  86
  87 static void fault_quit(void)
  88 {
  89         dump_core();
  90 }
  91
  92 static void winbindd_status(void)
  93 {
  94         struct winbindd_cli_state *tmp;
  95
  96         DEBUG(0, ("winbindd status:\n"));
  97
  98         /* Print client state information */
  99
 100         DEBUG(0, ("\t%d clients currently active\n", winbindd_num_clients()));
 101
 102         if (DEBUGLEVEL >= 2 && winbindd_num_clients()) {
 103                 DEBUG(2, ("\tclient list:\n"));
 104                 for(tmp = winbindd_client_list(); tmp; tmp = tmp->next) {
 105                         DEBUGADD(2, ("\t\tpid %lu, sock %d\n",
 106                                   (unsigned long)tmp->pid, tmp->sock));
 107                 }
 108         }
 109 }
 110
 111 /* Print winbindd status to log file */
 112
 113 static void print_winbindd_status(void)
 114 {
 115         winbindd_status();
 116 }
 117
 118 /* Flush client cache */
 119
 120 static void flush_caches(void)
 121 {
 122         /* We need to invalidate cached user list entries on a SIGHUP
 123            otherwise cached access denied errors due to restrict anonymous
 124            hang around until the sequence number changes. */
 125
 126         wcache_invalidate_cache();
 127 }
 128
 129 /* Handle the signal by unlinking socket and exiting */
 130
 131 static void terminate(void)
 132 {
 133
 134         winbindd_release_sockets();
 135         idmap_close();
 136
 137         trustdom_cache_shutdown();
 138
 139 #if 0
 140         if (interactive) {
 141                 TALLOC_CTX *mem_ctx = talloc_init("end_description");
 142                 char *description = talloc_describe_all(mem_ctx);
 143
 144                 DEBUG(3, ("tallocs left:\n%s\n", description));
 145                 talloc_destroy(mem_ctx);
 146         }
 147 #endif
 148
 149         exit(0);
 150 }
 151
 152 static BOOL do_sigterm;
 153
 154 static void termination_handler(int signum)
 155 {
 156         do_sigterm = True;
 157         sys_select_signal(signum);
 158 }
 159
 160 static BOOL do_sigusr2;
 161
 162 static void sigusr2_handler(int signum)
 163 {
 164         do_sigusr2 = True;
 165         sys_select_signal(SIGUSR2);
 166 }
 167
 168 static BOOL do_sighup;
 169
 170 static void sighup_handler(int signum)
 171 {
 172         do_sighup = True;
 173         sys_select_signal(SIGHUP);
 174 }
 175
 176 static BOOL do_sigchld;
 177
 178 static void sigchld_handler(int signum)
 179 {
 180         do_sigchld = True;
 181         sys_select_signal(SIGCHLD);
 182 }
 183
 184 /* React on 'smbcontrol winbindd reload-config' in the same way as on SIGHUP*/
 185 static void msg_reload_services(struct messaging_context *msg,
 186                                 void *private_data,
 187                                 uint32_t msg_type,
 188                                 struct server_id server_id,
 189                                 DATA_BLOB *data)
 190 {
 191         /* Flush various caches */
 192         flush_caches();
 193         reload_services_file();
 194 }
 195
 196 /* React on 'smbcontrol winbindd shutdown' in the same way as on SIGTERM*/
 197 static void msg_shutdown(struct messaging_context *msg,
 198                          void *private_data,
 199                          uint32_t msg_type,
 200                          struct server_id server_id,
 201                          DATA_BLOB *data)
 202 {
 203         do_sigterm = True;
 204 }
 205
 206 static struct winbindd_dispatch_table {
 207         enum winbindd_cmd cmd;
 208         void (*fn)(struct winbindd_cli_state *state);
 209         const char *winbindd_cmd_name;
 210 } dispatch_table[] = {
 211
 212         /* User functions */
 213
 214         { WINBINDD_GETPWNAM, winbindd_getpwnam, "GETPWNAM" },
 215         { WINBINDD_GETPWUID, winbindd_getpwuid, "GETPWUID" },
 216
 217         { WINBINDD_SETPWENT, winbindd_setpwent, "SETPWENT" },
 218         { WINBINDD_ENDPWENT, winbindd_endpwent, "ENDPWENT" },
 219         { WINBINDD_GETPWENT, winbindd_getpwent, "GETPWENT" },
 220
 221         { WINBINDD_GETGROUPS, winbindd_getgroups, "GETGROUPS" },
 222         { WINBINDD_GETUSERSIDS, winbindd_getusersids, "GETUSERSIDS" },
 223         { WINBINDD_GETUSERDOMGROUPS, winbindd_getuserdomgroups,
 224           "GETUSERDOMGROUPS" },
 225
 226         /* Group functions */
 227
 228         { WINBINDD_GETGRNAM, winbindd_getgrnam, "GETGRNAM" },
 229         { WINBINDD_GETGRGID, winbindd_getgrgid, "GETGRGID" },
 230         { WINBINDD_SETGRENT, winbindd_setgrent, "SETGRENT" },
 231         { WINBINDD_ENDGRENT, winbindd_endgrent, "ENDGRENT" },
 232         { WINBINDD_GETGRENT, winbindd_getgrent, "GETGRENT" },
 233         { WINBINDD_GETGRLST, winbindd_getgrent, "GETGRLST" },
 234
 235         /* PAM auth functions */
 236
 237         { WINBINDD_PAM_AUTH, winbindd_pam_auth, "PAM_AUTH" },
 238         { WINBINDD_PAM_AUTH_CRAP, winbindd_pam_auth_crap, "AUTH_CRAP" },
 239         { WINBINDD_PAM_CHAUTHTOK, winbindd_pam_chauthtok, "CHAUTHTOK" },
 240         { WINBINDD_PAM_LOGOFF, winbindd_pam_logoff, "PAM_LOGOFF" },
 241         { WINBINDD_PAM_CHNG_PSWD_AUTH_CRAP, winbindd_pam_chng_pswd_auth_crap, "CHNG_PSWD_AUTH_CRAP" },
 242
 243         /* Enumeration functions */
 244
 245         { WINBINDD_LIST_USERS, winbindd_list_users, "LIST_USERS" },
 246         { WINBINDD_LIST_GROUPS, winbindd_list_groups, "LIST_GROUPS" },
 247         { WINBINDD_LIST_TRUSTDOM, winbindd_list_trusted_domains,
 248           "LIST_TRUSTDOM" },
 249         { WINBINDD_SHOW_SEQUENCE, winbindd_show_sequence, "SHOW_SEQUENCE" },
 250
 251         /* SID related functions */
 252
 253         { WINBINDD_LOOKUPSID, winbindd_lookupsid, "LOOKUPSID" },
 254         { WINBINDD_LOOKUPNAME, winbindd_lookupname, "LOOKUPNAME" },
 255         { WINBINDD_LOOKUPRIDS, winbindd_lookuprids, "LOOKUPRIDS" },
 256
 257         /* Lookup related functions */
 258
 259         { WINBINDD_SID_TO_UID, winbindd_sid_to_uid, "SID_TO_UID" },
 260         { WINBINDD_SID_TO_GID, winbindd_sid_to_gid, "SID_TO_GID" },
 261         { WINBINDD_UID_TO_SID, winbindd_uid_to_sid, "UID_TO_SID" },
 262         { WINBINDD_GID_TO_SID, winbindd_gid_to_sid, "GID_TO_SID" },
 263 #if 0   /* DISABLED until we fix the interface in Samba 3.0.26 --jerry */
 264         { WINBINDD_SIDS_TO_XIDS, winbindd_sids_to_unixids, "SIDS_TO_XIDS" },
 265 #endif  /* end DISABLED */
 266         { WINBINDD_ALLOCATE_UID, winbindd_allocate_uid, "ALLOCATE_UID" },
 267         { WINBINDD_ALLOCATE_GID, winbindd_allocate_gid, "ALLOCATE_GID" },
 268         { WINBINDD_SET_MAPPING, winbindd_set_mapping, "SET_MAPPING" },
 269         { WINBINDD_SET_HWM, winbindd_set_hwm, "SET_HWMS" },
 270
 271         /* Miscellaneous */
 272
 273         { WINBINDD_DUMP_MAPS, winbindd_dump_maps, "DUMP_MAPS" },
 274
 275         { WINBINDD_CHECK_MACHACC, winbindd_check_machine_acct, "CHECK_MACHACC" },
 276         { WINBINDD_PING, winbindd_ping, "PING" },
 277         { WINBINDD_INFO, winbindd_info, "INFO" },
 278         { WINBINDD_INTERFACE_VERSION, winbindd_interface_version,
 279           "INTERFACE_VERSION" },
 280         { WINBINDD_DOMAIN_NAME, winbindd_domain_name, "DOMAIN_NAME" },
 281         { WINBINDD_DOMAIN_INFO, winbindd_domain_info, "DOMAIN_INFO" },
 282         { WINBINDD_NETBIOS_NAME, winbindd_netbios_name, "NETBIOS_NAME" },
 283         { WINBINDD_PRIV_PIPE_DIR, winbindd_priv_pipe_dir,
 284           "WINBINDD_PRIV_PIPE_DIR" },
 285         { WINBINDD_GETDCNAME, winbindd_getdcname, "GETDCNAME" },
 286
 287         /* Credential cache access */
 288         { WINBINDD_CCACHE_NTLMAUTH, winbindd_ccache_ntlm_auth, "NTLMAUTH" },
 289
 290         /* WINS functions */
 291
 292         { WINBINDD_WINS_BYNAME, winbindd_wins_byname, "WINS_BYNAME" },
 293         { WINBINDD_WINS_BYIP, winbindd_wins_byip, "WINS_BYIP" },
 294
 295         /* End of list */
 296
 297         { WINBINDD_NUM_CMDS, NULL, "NONE" }
 298 };
 299
 300 static void process_request(struct winbindd_cli_state *state)
 301 {
 302         struct winbindd_dispatch_table *table = dispatch_table;
 303
 304         /* Free response data - we may be interrupted and receive another
 305            command before being able to send this data off. */
 306
 307         SAFE_FREE(state->response.extra_data.data);
 308
 309         ZERO_STRUCT(state->response);
 310
 311         state->response.result = WINBINDD_PENDING;
 312         state->response.length = sizeof(struct winbindd_response);
 313
 314         state->mem_ctx = talloc_init("winbind request");
 315         if (state->mem_ctx == NULL)
 316                 return;
 317
 318         /* Process command */
 319
 320         for (table = dispatch_table; table->fn; table++) {
 321                 if (state->request.cmd == table->cmd) {
 322                         DEBUG(10,("process_request: request fn %s\n",
 323                                   table->winbindd_cmd_name ));
 324                         table->fn(state);
 325                         break;
 326                 }
 327         }
 328
 329         if (!table->fn) {
 330                 DEBUG(10,("process_request: unknown request fn number %d\n",
 331                           (int)state->request.cmd ));
 332                 request_error(state);
 333         }
 334 }
 335
 336 /*
 337  * A list of file descriptors being monitored by select in the main processing
 338  * loop. fd_event->handler is called whenever the socket is readable/writable.
 339  */
 340
 341 static struct fd_event *fd_events = NULL;
 342
 343 void add_fd_event(struct fd_event *ev)
 344 {
 345         struct fd_event *match;
 346
 347         /* only add unique fd_event structs */
 348
 349         for (match=fd_events; match; match=match->next ) {
 350 #ifdef DEVELOPER
 351                 SMB_ASSERT( match != ev );
 352 #else
 353                 if ( match == ev )
 354                         return;
 355 #endif
 356         }
 357
 358         DLIST_ADD(fd_events, ev);
 359 }
 360
 361 void remove_fd_event(struct fd_event *ev)
 362 {
 363         DLIST_REMOVE(fd_events, ev);
 364 }
 365
 366 /*
 367  * Handler for fd_events to complete a read/write request, set up by
 368  * setup_async_read/setup_async_write.
 369  */
 370
 371 static void rw_callback(struct fd_event *event, int flags)
 372 {
 373         size_t todo;
 374         ssize_t done = 0;
 375
 376         todo = event->length - event->done;
 377
 378         if (event->flags & EVENT_FD_WRITE) {
 379                 SMB_ASSERT(flags == EVENT_FD_WRITE);
 380                 done = sys_write(event->fd,
 381                                  &((char *)event->data)[event->done],
 382                                  todo);
 383
 384                 if (done <= 0) {
 385                         event->flags = 0;
 386                         event->finished(event->private_data, False);
 387                         return;
 388                 }
 389         }
 390
 391         if (event->flags & EVENT_FD_READ) {
 392                 SMB_ASSERT(flags == EVENT_FD_READ);
 393                 done = sys_read(event->fd, &((char *)event->data)[event->done],
 394                                 todo);
 395
 396                 if (done <= 0) {
 397                         event->flags = 0;
 398                         event->finished(event->private_data, False);
 399                         return;
 400                 }
 401         }
 402
 403         event->done += done;
 404
 405         if (event->done == event->length) {
 406                 event->flags = 0;
 407                 event->finished(event->private_data, True);
 408         }
 409 }
 410
 411 /*
 412  * Request an async read/write on a fd_event structure. (*finished) is called
 413  * when the request is completed or an error had occurred.
 414  */
 415
 416 void setup_async_read(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_READ;
 428 }
 429
 430 void setup_async_write(struct fd_event *event, void *data, size_t length,
 431                        void (*finished)(void *private_data, BOOL success),
 432                        void *private_data)
 433 {
 434         SMB_ASSERT(event->flags == 0);
 435         event->data = data;
 436         event->length = length;
 437         event->done = 0;
 438         event->handler = rw_callback;
 439         event->finished = finished;
 440         event->private_data = private_data;
 441         event->flags = EVENT_FD_WRITE;
 442 }
 443
 444 /*
 445  * This is the main event loop of winbind requests. It goes through a
 446  * state-machine of 3 read/write requests, 4 if you have extra data to send.
 447  *
 448  * An idle winbind client has a read request of 4 bytes outstanding,
 449  * finalizing function is request_len_recv, checking the length. request_recv
 450  * then processes the packet. The processing function then at some point has
 451  * to call request_finished which schedules sending the response.
 452  */
 453
 454 static void request_len_recv(void *private_data, BOOL success);
 455 static void request_recv(void *private_data, BOOL success);
 456 static void request_main_recv(void *private_data, BOOL success);
 457 static void request_finished(struct winbindd_cli_state *state);
 458 void request_finished_cont(void *private_data, BOOL success);
 459 static void response_main_sent(void *private_data, BOOL success);
 460 static void response_extra_sent(void *private_data, BOOL success);
 461
 462 static void response_extra_sent(void *private_data, BOOL success)
 463 {
 464         struct winbindd_cli_state *state =
 465                 talloc_get_type_abort(private_data, struct winbindd_cli_state);
 466
 467         if (state->mem_ctx != NULL) {
 468                 talloc_destroy(state->mem_ctx);
 469                 state->mem_ctx = NULL;
 470         }
 471
 472         if (!success) {
 473                 state->finished = True;
 474                 return;
 475         }
 476
 477         SAFE_FREE(state->request.extra_data.data);
 478         SAFE_FREE(state->response.extra_data.data);
 479
 480         setup_async_read(&state->fd_event, &state->request, sizeof(uint32),
 481                          request_len_recv, state);
 482 }
 483
 484 static void response_main_sent(void *private_data, BOOL success)
 485 {
 486         struct winbindd_cli_state *state =
 487                 talloc_get_type_abort(private_data, struct winbindd_cli_state);
 488
 489         if (!success) {
 490                 state->finished = True;
 491                 return;
 492         }
 493
 494         if (state->response.length == sizeof(state->response)) {
 495                 if (state->mem_ctx != NULL) {
 496                         talloc_destroy(state->mem_ctx);
 497                         state->mem_ctx = NULL;
 498                 }
 499
 500                 setup_async_read(&state->fd_event, &state->request,
 501                                  sizeof(uint32), request_len_recv, state);
 502                 return;
 503         }
 504
 505         setup_async_write(&state->fd_event, state->response.extra_data.data,
 506                           state->response.length - sizeof(state->response),
 507                           response_extra_sent, state);
 508 }
 509
 510 static void request_finished(struct winbindd_cli_state *state)
 511 {
 512         setup_async_write(&state->fd_event, &state->response,
 513                           sizeof(state->response), response_main_sent, state);
 514 }
 515
 516 void request_error(struct winbindd_cli_state *state)
 517 {
 518         SMB_ASSERT(state->response.result == WINBINDD_PENDING);
 519         state->response.result = WINBINDD_ERROR;
 520         request_finished(state);
 521 }
 522
 523 void request_ok(struct winbindd_cli_state *state)
 524 {
 525         SMB_ASSERT(state->response.result == WINBINDD_PENDING);
 526         state->response.result = WINBINDD_OK;
 527         request_finished(state);
 528 }
 529
 530 void request_finished_cont(void *private_data, BOOL success)
 531 {
 532         struct winbindd_cli_state *state =
 533                 talloc_get_type_abort(private_data, struct winbindd_cli_state);
 534
 535         if (success)
 536                 request_ok(state);
 537         else
 538                 request_error(state);
 539 }
 540
 541 static void request_len_recv(void *private_data, BOOL success)
 542 {
 543         struct winbindd_cli_state *state =
 544                 talloc_get_type_abort(private_data, struct winbindd_cli_state);
 545
 546         if (!success) {
 547                 state->finished = True;
 548                 return;
 549         }
 550
 551         if (*(uint32 *)(&state->request) != sizeof(state->request)) {
 552                 DEBUG(0,("request_len_recv: Invalid request size received: %d\n",
 553                          *(uint32 *)(&state->request)));
 554                 state->finished = True;
 555                 return;
 556         }
 557
 558         setup_async_read(&state->fd_event, (uint32 *)(&state->request)+1,
 559                          sizeof(state->request) - sizeof(uint32),
 560                          request_main_recv, state);
 561 }
 562
 563 static void request_main_recv(void *private_data, BOOL success)
 564 {
 565         struct winbindd_cli_state *state =
 566                 talloc_get_type_abort(private_data, struct winbindd_cli_state);
 567
 568         if (!success) {
 569                 state->finished = True;
 570                 return;
 571         }
 572
 573         if (state->request.extra_len == 0) {
 574                 state->request.extra_data.data = NULL;
 575                 request_recv(state, True);
 576                 return;
 577         }
 578
 579         if ((!state->privileged) &&
 580             (state->request.extra_len > WINBINDD_MAX_EXTRA_DATA)) {
 581                 DEBUG(3, ("Got request with %d bytes extra data on "
 582                           "unprivileged socket\n", (int)state->request.extra_len));
 583                 state->request.extra_data.data = NULL;
 584                 state->finished = True;
 585                 return;
 586         }
 587
 588         state->request.extra_data.data =
 589                 SMB_MALLOC_ARRAY(char, state->request.extra_len + 1);
 590
 591         if (state->request.extra_data.data == NULL) {
 592                 DEBUG(0, ("malloc failed\n"));
 593                 state->finished = True;
 594                 return;
 595         }
 596
 597         /* Ensure null termination */
 598         state->request.extra_data.data[state->request.extra_len] = '\0';
 599
 600         setup_async_read(&state->fd_event, state->request.extra_data.data,
 601                          state->request.extra_len, request_recv, state);
 602 }
 603
 604 static void request_recv(void *private_data, BOOL success)
 605 {
 606         struct winbindd_cli_state *state =
 607                 talloc_get_type_abort(private_data, struct winbindd_cli_state);
 608
 609         if (!success) {
 610                 state->finished = True;
 611                 return;
 612         }
 613
 614         process_request(state);
 615 }
 616
 617 /* Process a new connection by adding it to the client connection list */
 618
 619 static void new_connection(int listen_sock, BOOL privileged)
 620 {
 621         struct sockaddr_un sunaddr;
 622         struct winbindd_cli_state *state;
 623         socklen_t len;
 624         int sock;
 625
 626         /* Accept connection */
 627
 628         len = sizeof(sunaddr);
 629
 630         do {
 631                 sock = accept(listen_sock, (struct sockaddr *)&sunaddr, &len);
 632         } while (sock == -1 && errno == EINTR);
 633
 634         if (sock == -1)
 635                 return;
 636
 637         DEBUG(6,("accepted socket %d\n", sock));
 638
 639         /* Create new connection structure */
 640
 641         if ((state = TALLOC_ZERO_P(NULL, struct winbindd_cli_state)) == NULL) {
 642                 close(sock);
 643                 return;
 644         }
 645
 646         state->sock = sock;
 647
 648         state->last_access = time(NULL);
 649
 650         state->privileged = privileged;
 651
 652         state->fd_event.fd = state->sock;
 653         state->fd_event.flags = 0;
 654         add_fd_event(&state->fd_event);
 655
 656         setup_async_read(&state->fd_event, &state->request, sizeof(uint32),
 657                          request_len_recv, state);
 658
 659         /* Add to connection list */
 660
 661         winbindd_add_client(state);
 662 }
 663
 664 /* Remove a client connection from client connection list */
 665
 666 static void remove_client(struct winbindd_cli_state *state)
 667 {
 668         /* It's a dead client - hold a funeral */
 669
 670         if (state == NULL) {
 671                 return;
 672         }
 673
 674         /* Close socket */
 675
 676         close(state->sock);
 677
 678         /* Free any getent state */
 679
 680         free_getent_state(state->getpwent_state);
 681         free_getent_state(state->getgrent_state);
 682
 683         /* We may have some extra data that was not freed if the client was
 684            killed unexpectedly */
 685
 686         SAFE_FREE(state->response.extra_data.data);
 687
 688         if (state->mem_ctx != NULL) {
 689                 talloc_destroy(state->mem_ctx);
 690                 state->mem_ctx = NULL;
 691         }
 692
 693         remove_fd_event(&state->fd_event);
 694
 695         /* Remove from list and free */
 696
 697         winbindd_remove_client(state);
 698         TALLOC_FREE(state);
 699 }
 700
 701 /* Shutdown client connection which has been idle for the longest time */
 702
 703 static BOOL remove_idle_client(void)
 704 {
 705         struct winbindd_cli_state *state, *remove_state = NULL;
 706         time_t last_access = 0;
 707         int nidle = 0;
 708
 709         for (state = winbindd_client_list(); state; state = state->next) {
 710                 if (state->response.result != WINBINDD_PENDING &&
 711                     !state->getpwent_state && !state->getgrent_state) {
 712                         nidle++;
 713                         if (!last_access || state->last_access < last_access) {
 714                                 last_access = state->last_access;
 715                                 remove_state = state;
 716                         }
 717                 }
 718         }
 719
 720         if (remove_state) {
 721                 DEBUG(5,("Found %d idle client connections, shutting down sock %d, pid %u\n",
 722                         nidle, remove_state->sock, (unsigned int)remove_state->pid));
 723                 remove_client(remove_state);
 724                 return True;
 725         }
 726
 727         return False;
 728 }
 729
 730 /* Process incoming clients on listen_sock.  We use a tricky non-blocking,
 731    non-forking, non-threaded model which allows us to handle many
 732    simultaneous connections while remaining impervious to many denial of
 733    service attacks. */
 734
 735 static int process_loop(int listen_sock, int listen_priv_sock)
 736 {
 737         struct winbindd_cli_state *state;
 738         struct fd_event *ev;
 739         fd_set r_fds, w_fds;
 740         int maxfd, selret;
 741         struct timeval timeout, ev_timeout;
 742
 743         /* We'll be doing this a lot */
 744
 745         /* Handle messages */
 746
 747         message_dispatch(winbind_messaging_context());
 748
 749         run_events(winbind_event_context(), 0, NULL, NULL);
 750
 751         /* refresh the trusted domain cache */
 752
 753         rescan_trusted_domains();
 754
 755         /* Free up temporary memory */
 756
 757         lp_TALLOC_FREE();
 758         main_loop_TALLOC_FREE();
 759
 760         /* Initialise fd lists for select() */
 761
 762         maxfd = MAX(listen_sock, listen_priv_sock);
 763
 764         FD_ZERO(&r_fds);
 765         FD_ZERO(&w_fds);
 766         FD_SET(listen_sock, &r_fds);
 767         FD_SET(listen_priv_sock, &r_fds);
 768
 769         timeout.tv_sec = WINBINDD_ESTABLISH_LOOP;
 770         timeout.tv_usec = 0;
 771
 772         /* Check for any event timeouts. */
 773         if (get_timed_events_timeout(winbind_event_context(), &ev_timeout)) {
 774                 timeout = timeval_min(&timeout, &ev_timeout);
 775         }
 776
 777         /* Set up client readers and writers */
 778
 779         state = winbindd_client_list();
 780
 781         while (state) {
 782
 783                 struct winbindd_cli_state *next = state->next;
 784
 785                 /* Dispose of client connection if it is marked as
 786                    finished */
 787
 788                 if (state->finished)
 789                         remove_client(state);
 790
 791                 state = next;
 792         }
 793
 794         for (ev = fd_events; ev; ev = ev->next) {
 795                 if (ev->flags & EVENT_FD_READ) {
 796                         FD_SET(ev->fd, &r_fds);
 797                         maxfd = MAX(ev->fd, maxfd);
 798                 }
 799                 if (ev->flags & EVENT_FD_WRITE) {
 800                         FD_SET(ev->fd, &w_fds);
 801                         maxfd = MAX(ev->fd, maxfd);
 802                 }
 803         }
 804
 805         /* Call select */
 806
 807         selret = sys_select(maxfd + 1, &r_fds, &w_fds, NULL, &timeout);
 808
 809         if (selret == 0) {
 810                 goto no_fds_ready;
 811         }
 812
 813         if (selret == -1) {
 814                 if (errno == EINTR) {
 815                         goto no_fds_ready;
 816                 }
 817
 818                 /* Select error, something is badly wrong */
 819
 820                 perror("select");
 821                 exit(1);
 822         }
 823
 824         /* selret > 0 */
 825
 826         ev = fd_events;
 827         while (ev != NULL) {
 828                 struct fd_event *next = ev->next;
 829                 int flags = 0;
 830                 if (FD_ISSET(ev->fd, &r_fds))
 831                         flags |= EVENT_FD_READ;
 832                 if (FD_ISSET(ev->fd, &w_fds))
 833                         flags |= EVENT_FD_WRITE;
 834                 if (flags)
 835                         ev->handler(ev, flags);
 836                 ev = next;
 837         }
 838
 839         if (FD_ISSET(listen_sock, &r_fds)) {
 840                 while (winbindd_num_clients() >
 841                        WINBINDD_MAX_SIMULTANEOUS_CLIENTS - 1) {
 842                         DEBUG(5,("winbindd: Exceeding %d client "
 843                                  "connections, removing idle "
 844                                  "connection.\n",
 845                                  WINBINDD_MAX_SIMULTANEOUS_CLIENTS));
 846                         if (!remove_idle_client()) {
 847                                 DEBUG(0,("winbindd: Exceeding %d "
 848                                          "client connections, no idle "
 849                                          "connection found\n",
 850                                          WINBINDD_MAX_SIMULTANEOUS_CLIENTS));
 851                                 break;
 852                         }
 853                 }
 854                 /* new, non-privileged connection */
 855                 new_connection(listen_sock, False);
 856         }
 857
 858         if (FD_ISSET(listen_priv_sock, &r_fds)) {
 859                 while (winbindd_num_clients() >
 860                        WINBINDD_MAX_SIMULTANEOUS_CLIENTS - 1) {
 861                         DEBUG(5,("winbindd: Exceeding %d client "
 862                                  "connections, removing idle "
 863                                  "connection.\n",
 864                                  WINBINDD_MAX_SIMULTANEOUS_CLIENTS));
 865                         if (!remove_idle_client()) {
 866                                 DEBUG(0,("winbindd: Exceeding %d "
 867                                          "client connections, no idle "
 868                                          "connection found\n",
 869                                          WINBINDD_MAX_SIMULTANEOUS_CLIENTS));
 870                                 break;
 871                         }
 872                 }
 873                 /* new, privileged connection */
 874                 new_connection(listen_priv_sock, True);
 875         }
 876
 877  no_fds_ready:
 878
 879 #if 0
 880         winbindd_check_cache_size(time(NULL));
 881 #endif
 882
 883         /* Check signal handling things */
 884
 885         if (do_sigterm)
 886                 terminate();
 887
 888         if (do_sighup) {
 889
 890                 DEBUG(3, ("got SIGHUP\n"));
 891
 892                 flush_caches();
 893                 reload_services_file();
 894
 895                 do_sighup = False;
 896         }
 897
 898         if (do_sigusr2) {
 899                 print_winbindd_status();
 900                 do_sigusr2 = False;
 901         }
 902
 903         if (do_sigchld) {
 904                 pid_t pid;
 905
 906                 do_sigchld = False;
 907
 908                 while ((pid = sys_waitpid(-1, NULL, WNOHANG)) > 0) {
 909                         winbind_child_died(pid);
 910                 }
 911         }
 912
 913
 914         return winbindd_num_clients();
 915 }
 916
 917 static void winbindd_process_loop(enum smb_server_mode server_mode)
 918 {
 919         int idle_timeout_sec;
 920         struct timeval starttime;
 921         int listen_public, listen_priv;
 922
 923         errno = 0;
 924         if (!winbindd_init_sockets(&listen_public, &listen_priv,
 925                                     &idle_timeout_sec)) {
 926                 terminate();
 927         }
 928
 929         starttime = timeval_current();
 930
 931         if (listen_public == -1 || listen_priv == -1) {
 932                 DEBUG(0, ("failed to open winbindd pipes: %s\n",
 933                             errno ? strerror(errno) : "unknown error"));
 934                 terminate();
 935         }
 936
 937         for (;;) {
 938                 int clients = process_loop(listen_public, listen_priv);
 939
 940                 /* Don't bother figuring out the idle time if we won't be
 941                  * timing out anyway.
 942                  */
 943                 if (idle_timeout_sec < 0) {
 944                         continue;
 945                 }
 946
 947                 if (clients == 0 && server_mode == SERVER_MODE_FOREGROUND) {
 948                         struct timeval now;
 949
 950                         now = timeval_current();
 951                         if (timeval_elapsed2(&starttime, &now) >
 952                                 (double)idle_timeout_sec) {
 953                                 DEBUG(0, ("idle for %d secs, exitting\n",
 954                                             idle_timeout_sec));
 955                                 terminate();
 956                         }
 957                 } else {
 958                         starttime = timeval_current();
 959                 }
 960         }
 961 }
 962
 963 /* Main function */
 964
 965 int main(int argc, char **argv, char **envp)
 966 {
 967         pstring logfile;
 968         BOOL log_stdout = False;
 969         BOOL no_process_group = False;
 970
 971         enum smb_server_mode server_mode = SERVER_MODE_DAEMON;
 972
 973         struct poptOption long_options[] = {
 974                 POPT_AUTOHELP
 975                 { "stdout", 'S', POPT_ARG_VAL, &log_stdout, True, "Log to stdout" },
 976                 { "foreground", 'F', POPT_ARG_VAL, &server_mode, SERVER_MODE_FOREGROUND, "Daemon in foreground mode" },
 977                 { "no-process-group", 0, POPT_ARG_VAL, &no_process_group, True, "Don't create a new process group" },
 978                 { "interactive", 'i', POPT_ARG_VAL, &server_mode, SERVER_MODE_INTERACTIVE, "Interactive mode" },
 979                 { "no-caching", 'n', POPT_ARG_VAL, &opt_nocache, True, "Disable caching" },
 980                 POPT_COMMON_SAMBA
 981                 POPT_TABLEEND
 982         };
 983         poptContext pc;
 984         int opt;
 985
 986         /* glibc (?) likes to print "User defined signal 1" and exit if a
 987            SIGUSR[12] is received before a handler is installed */
 988
 989         CatchSignal(SIGUSR1, SIG_IGN);
 990         CatchSignal(SIGUSR2, SIG_IGN);
 991
 992         fault_setup((void (*)(void *))fault_quit );
 993         dump_core_setup("winbindd");
 994
 995         load_case_tables();
 996
 997         /* Initialise for running in non-root mode */
 998
 999         sec_init();
1000
1001         set_remote_machine_name("winbindd", False);
1002
1003         /* Set environment variable so we don't recursively call ourselves.
1004            This may also be useful interactively. */
1005
1006         if ( !winbind_off() ) {
1007                 DEBUG(0,("Failed to disable recusive winbindd calls.  Exiting.\n"));
1008                 exit(1);
1009         }
1010
1011         /* Initialise samba/rpc client stuff */
1012
1013         pc = poptGetContext("winbindd", argc, (const char **)argv, long_options,
1014                                                 POPT_CONTEXT_KEEP_FIRST);
1015
1016         while ((opt = poptGetNextOpt(pc)) != -1) {}
1017
1018         if (server_mode == SERVER_MODE_INTERACTIVE) {
1019                 log_stdout = True;
1020                 if (DEBUGLEVEL >= 9) {
1021                         talloc_enable_leak_report();
1022                 }
1023         }
1024
1025         if (log_stdout && server_mode == SERVER_MODE_DAEMON) {
1026                 printf("Can't log to stdout (-S) unless daemon is in foreground (-F) or interactive (-i)\n");
1027                 poptPrintUsage(pc, stderr, 0);
1028                 exit(1);
1029         }
1030
1031         if (!override_logfile) {
1032                 pstr_sprintf(logfile, "%s/log.winbindd", dyn_LOGFILEBASE);
1033                 lp_set_logfile(logfile);
1034         }
1035         setup_logging("winbindd", log_stdout);
1036         reopen_logs();
1037
1038         DEBUG(1, ("winbindd version %s started.\n%s\n",
1039                   SAMBA_VERSION_STRING,
1040                   COPYRIGHT_STARTUP_MESSAGE) );
1041
1042         if (!reload_services_file()) {
1043                 DEBUG(0, ("error opening config file\n"));
1044                 exit(1);
1045         }
1046
1047         if (!directory_exist(lp_lockdir(), NULL)) {
1048                 mkdir(lp_lockdir(), 0755);
1049         }
1050
1051         /* Setup names. */
1052
1053         if (!init_names())
1054                 exit(1);
1055
1056         load_interfaces();
1057
1058         if (!secrets_init()) {
1059
1060                 DEBUG(0,("Could not initialize domain trust account secrets. Giving up\n"));
1061                 return False;
1062         }
1063
1064         /* Enable netbios namecache */
1065
1066         namecache_enable();
1067
1068         /* Winbind daemon initialisation */
1069
1070         if ( ! NT_STATUS_IS_OK(idmap_init_cache()) ) {
1071                 DEBUG(1, ("Could not init idmap cache!\n"));
1072         }
1073
1074         /* Unblock all signals we are interested in as they may have been
1075            blocked by the parent process. */
1076
1077         BlockSignals(False, SIGINT);
1078         BlockSignals(False, SIGQUIT);
1079         BlockSignals(False, SIGTERM);
1080         BlockSignals(False, SIGUSR1);
1081         BlockSignals(False, SIGUSR2);
1082         BlockSignals(False, SIGHUP);
1083         BlockSignals(False, SIGCHLD);
1084
1085         /* Setup signal handlers */
1086
1087         CatchSignal(SIGINT, termination_handler);      /* Exit on these sigs */
1088         CatchSignal(SIGQUIT, termination_handler);
1089         CatchSignal(SIGTERM, termination_handler);
1090         CatchSignal(SIGCHLD, sigchld_handler);
1091
1092         CatchSignal(SIGPIPE, SIG_IGN);                 /* Ignore sigpipe */
1093
1094         CatchSignal(SIGUSR2, sigusr2_handler);         /* Debugging sigs */
1095         CatchSignal(SIGHUP, sighup_handler);
1096
1097         if (server_mode == SERVER_MODE_DAEMON) {
1098                 DEBUG( 3, ( "Becoming a daemon.\n" ) );
1099                 become_daemon(True, no_process_group);
1100         } else if (server_mode == SERVER_MODE_FOREGROUND) {
1101                 become_daemon(False, no_process_group);
1102         }
1103
1104         pidfile_create("winbindd");
1105
1106         /* Ensure all cache and idmap caches are consistent
1107            before we startup. */
1108
1109         if (winbindd_validate_cache()) {
1110                 /* We have a bad cache, but luckily we
1111                    just deleted it. Restart ourselves */
1112                 int i;
1113                 /* Ensure we have no open low fd's. */
1114                 for (i = 3; i < 100; i++) {
1115                         close(i);
1116                 }
1117                 return execve(argv[0], argv, envp);
1118         }
1119
1120 #if HAVE_SETPGID
1121         /*
1122          * If we're interactive we want to set our own process group for
1123          * signal management.
1124          */
1125         if (server_mode == SERVER_MODE_INTERACTIVE && !no_process_group) {
1126                 setpgid( (pid_t)0, (pid_t)0);
1127         }
1128 #endif
1129
1130         TimeInit();
1131
1132         /* Initialise messaging system */
1133
1134         if (winbind_messaging_context() == NULL) {
1135                 DEBUG(0, ("unable to initialize messaging system\n"));
1136                 exit(1);
1137         }
1138
1139         /* Initialize cache (ensure version is correct). */
1140         if (!initialize_winbindd_cache()) {
1141                 exit(1);
1142         }
1143
1144         /* React on 'smbcontrol winbindd reload-config' in the same way
1145            as to SIGHUP signal */
1146         messaging_register(winbind_messaging_context(), NULL,
1147                            MSG_SMB_CONF_UPDATED, msg_reload_services);
1148         messaging_register(winbind_messaging_context(), NULL,
1149                            MSG_SHUTDOWN, msg_shutdown);
1150
1151         /* Handle online/offline messages. */
1152         messaging_register(winbind_messaging_context(), NULL,
1153                            MSG_WINBIND_OFFLINE, winbind_msg_offline);
1154         messaging_register(winbind_messaging_context(), NULL,
1155                            MSG_WINBIND_ONLINE, winbind_msg_online);
1156         messaging_register(winbind_messaging_context(), NULL,
1157                            MSG_WINBIND_ONLINESTATUS, winbind_msg_onlinestatus);
1158
1159         poptFreeContext(pc);
1160
1161         netsamlogon_cache_init(); /* Non-critical */
1162
1163         /* clear the cached list of trusted domains */
1164
1165         wcache_tdc_clear();
1166
1167         /* clear the cached list of trusted domains */
1168
1169         wcache_tdc_clear();
1170
1171         if (!init_domain_list()) {
1172                 DEBUG(0,("unable to initalize domain list\n"));
1173                 exit(1);
1174         }
1175
1176         init_idmap_child();
1177
1178         smb_nscd_flush_user_cache();
1179         smb_nscd_flush_group_cache();
1180
1181         /* Loop waiting for requests */
1182         winbindd_process_loop(server_mode);
1183
1184         return 0;
1185 }