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         /* Remember who asked us. */
 319         state->pid = state->request.pid;
 320
 321         /* Process command */
 322
 323         for (table = dispatch_table; table->fn; table++) {
 324                 if (state->request.cmd == table->cmd) {
 325                         DEBUG(10,("process_request: request fn %s\n",
 326                                   table->winbindd_cmd_name ));
 327                         table->fn(state);
 328                         break;
 329                 }
 330         }
 331
 332         if (!table->fn) {
 333                 DEBUG(10,("process_request: unknown request fn number %d\n",
 334                           (int)state->request.cmd ));
 335                 request_error(state);
 336         }
 337 }
 338
 339 /*
 340  * A list of file descriptors being monitored by select in the main processing
 341  * loop. fd_event->handler is called whenever the socket is readable/writable.
 342  */
 343
 344 static struct fd_event *fd_events = NULL;
 345
 346 void add_fd_event(struct fd_event *ev)
 347 {
 348         struct fd_event *match;
 349
 350         /* only add unique fd_event structs */
 351
 352         for (match=fd_events; match; match=match->next ) {
 353 #ifdef DEVELOPER
 354                 SMB_ASSERT( match != ev );
 355 #else
 356                 if ( match == ev )
 357                         return;
 358 #endif
 359         }
 360
 361         DLIST_ADD(fd_events, ev);
 362 }
 363
 364 void remove_fd_event(struct fd_event *ev)
 365 {
 366         DLIST_REMOVE(fd_events, ev);
 367 }
 368
 369 /*
 370  * Handler for fd_events to complete a read/write request, set up by
 371  * setup_async_read/setup_async_write.
 372  */
 373
 374 static void rw_callback(struct fd_event *event, int flags)
 375 {
 376         size_t todo;
 377         ssize_t done = 0;
 378
 379         todo = event->length - event->done;
 380
 381         if (event->flags & EVENT_FD_WRITE) {
 382                 SMB_ASSERT(flags == EVENT_FD_WRITE);
 383                 done = sys_write(event->fd,
 384                                  &((char *)event->data)[event->done],
 385                                  todo);
 386
 387                 if (done <= 0) {
 388                         event->flags = 0;
 389                         event->finished(event->private_data, False);
 390                         return;
 391                 }
 392         }
 393
 394         if (event->flags & EVENT_FD_READ) {
 395                 SMB_ASSERT(flags == EVENT_FD_READ);
 396                 done = sys_read(event->fd, &((char *)event->data)[event->done],
 397                                 todo);
 398
 399                 if (done <= 0) {
 400                         event->flags = 0;
 401                         event->finished(event->private_data, False);
 402                         return;
 403                 }
 404         }
 405
 406         event->done += done;
 407
 408         if (event->done == event->length) {
 409                 event->flags = 0;
 410                 event->finished(event->private_data, True);
 411         }
 412 }
 413
 414 /*
 415  * Request an async read/write on a fd_event structure. (*finished) is called
 416  * when the request is completed or an error had occurred.
 417  */
 418
 419 void setup_async_read(struct fd_event *event, void *data, size_t length,
 420                       void (*finished)(void *private_data, BOOL success),
 421                       void *private_data)
 422 {
 423         SMB_ASSERT(event->flags == 0);
 424         event->data = data;
 425         event->length = length;
 426         event->done = 0;
 427         event->handler = rw_callback;
 428         event->finished = finished;
 429         event->private_data = private_data;
 430         event->flags = EVENT_FD_READ;
 431 }
 432
 433 void setup_async_write(struct fd_event *event, void *data, size_t length,
 434                        void (*finished)(void *private_data, BOOL success),
 435                        void *private_data)
 436 {
 437         SMB_ASSERT(event->flags == 0);
 438         event->data = data;
 439         event->length = length;
 440         event->done = 0;
 441         event->handler = rw_callback;
 442         event->finished = finished;
 443         event->private_data = private_data;
 444         event->flags = EVENT_FD_WRITE;
 445 }
 446
 447 /*
 448  * This is the main event loop of winbind requests. It goes through a
 449  * state-machine of 3 read/write requests, 4 if you have extra data to send.
 450  *
 451  * An idle winbind client has a read request of 4 bytes outstanding,
 452  * finalizing function is request_len_recv, checking the length. request_recv
 453  * then processes the packet. The processing function then at some point has
 454  * to call request_finished which schedules sending the response.
 455  */
 456
 457 static void request_len_recv(void *private_data, BOOL success);
 458 static void request_recv(void *private_data, BOOL success);
 459 static void request_main_recv(void *private_data, BOOL success);
 460 static void request_finished(struct winbindd_cli_state *state);
 461 void request_finished_cont(void *private_data, BOOL success);
 462 static void response_main_sent(void *private_data, BOOL success);
 463 static void response_extra_sent(void *private_data, BOOL success);
 464
 465 static void response_extra_sent(void *private_data, BOOL success)
 466 {
 467         struct winbindd_cli_state *state =
 468                 talloc_get_type_abort(private_data, struct winbindd_cli_state);
 469
 470         if (state->mem_ctx != NULL) {
 471                 talloc_destroy(state->mem_ctx);
 472                 state->mem_ctx = NULL;
 473         }
 474
 475         if (!success) {
 476                 state->finished = True;
 477                 return;
 478         }
 479
 480         SAFE_FREE(state->request.extra_data.data);
 481         SAFE_FREE(state->response.extra_data.data);
 482
 483         setup_async_read(&state->fd_event, &state->request, sizeof(uint32),
 484                          request_len_recv, state);
 485 }
 486
 487 static void response_main_sent(void *private_data, BOOL success)
 488 {
 489         struct winbindd_cli_state *state =
 490                 talloc_get_type_abort(private_data, struct winbindd_cli_state);
 491
 492         if (!success) {
 493                 state->finished = True;
 494                 return;
 495         }
 496
 497         if (state->response.length == sizeof(state->response)) {
 498                 if (state->mem_ctx != NULL) {
 499                         talloc_destroy(state->mem_ctx);
 500                         state->mem_ctx = NULL;
 501                 }
 502
 503                 setup_async_read(&state->fd_event, &state->request,
 504                                  sizeof(uint32), request_len_recv, state);
 505                 return;
 506         }
 507
 508         setup_async_write(&state->fd_event, state->response.extra_data.data,
 509                           state->response.length - sizeof(state->response),
 510                           response_extra_sent, state);
 511 }
 512
 513 static void request_finished(struct winbindd_cli_state *state)
 514 {
 515         setup_async_write(&state->fd_event, &state->response,
 516                           sizeof(state->response), response_main_sent, state);
 517 }
 518
 519 void request_error(struct winbindd_cli_state *state)
 520 {
 521         SMB_ASSERT(state->response.result == WINBINDD_PENDING);
 522         state->response.result = WINBINDD_ERROR;
 523         request_finished(state);
 524 }
 525
 526 void request_ok(struct winbindd_cli_state *state)
 527 {
 528         SMB_ASSERT(state->response.result == WINBINDD_PENDING);
 529         state->response.result = WINBINDD_OK;
 530         request_finished(state);
 531 }
 532
 533 void request_finished_cont(void *private_data, BOOL success)
 534 {
 535         struct winbindd_cli_state *state =
 536                 talloc_get_type_abort(private_data, struct winbindd_cli_state);
 537
 538         if (success)
 539                 request_ok(state);
 540         else
 541                 request_error(state);
 542 }
 543
 544 static void request_len_recv(void *private_data, BOOL success)
 545 {
 546         struct winbindd_cli_state *state =
 547                 talloc_get_type_abort(private_data, struct winbindd_cli_state);
 548
 549         if (!success) {
 550                 state->finished = True;
 551                 return;
 552         }
 553
 554         if (*(uint32 *)(&state->request) != sizeof(state->request)) {
 555                 DEBUG(0,("request_len_recv: Invalid request size received: %d\n",
 556                          *(uint32 *)(&state->request)));
 557                 state->finished = True;
 558                 return;
 559         }
 560
 561         setup_async_read(&state->fd_event, (uint32 *)(&state->request)+1,
 562                          sizeof(state->request) - sizeof(uint32),
 563                          request_main_recv, state);
 564 }
 565
 566 static void request_main_recv(void *private_data, BOOL success)
 567 {
 568         struct winbindd_cli_state *state =
 569                 talloc_get_type_abort(private_data, struct winbindd_cli_state);
 570
 571         if (!success) {
 572                 state->finished = True;
 573                 return;
 574         }
 575
 576         if (state->request.extra_len == 0) {
 577                 state->request.extra_data.data = NULL;
 578                 request_recv(state, True);
 579                 return;
 580         }
 581
 582         if ((!state->privileged) &&
 583             (state->request.extra_len > WINBINDD_MAX_EXTRA_DATA)) {
 584                 DEBUG(3, ("Got request with %d bytes extra data on "
 585                           "unprivileged socket\n", (int)state->request.extra_len));
 586                 state->request.extra_data.data = NULL;
 587                 state->finished = True;
 588                 return;
 589         }
 590
 591         state->request.extra_data.data =
 592                 SMB_MALLOC_ARRAY(char, state->request.extra_len + 1);
 593
 594         if (state->request.extra_data.data == NULL) {
 595                 DEBUG(0, ("malloc failed\n"));
 596                 state->finished = True;
 597                 return;
 598         }
 599
 600         /* Ensure null termination */
 601         state->request.extra_data.data[state->request.extra_len] = '\0';
 602
 603         setup_async_read(&state->fd_event, state->request.extra_data.data,
 604                          state->request.extra_len, request_recv, state);
 605 }
 606
 607 static void request_recv(void *private_data, BOOL success)
 608 {
 609         struct winbindd_cli_state *state =
 610                 talloc_get_type_abort(private_data, struct winbindd_cli_state);
 611
 612         if (!success) {
 613                 state->finished = True;
 614                 return;
 615         }
 616
 617         process_request(state);
 618 }
 619
 620 /* Process a new connection by adding it to the client connection list */
 621
 622 static void new_connection(int listen_sock, BOOL privileged)
 623 {
 624         struct sockaddr_un sunaddr;
 625         struct winbindd_cli_state *state;
 626         socklen_t len;
 627         int sock;
 628
 629         /* Accept connection */
 630
 631         len = sizeof(sunaddr);
 632
 633         do {
 634                 sock = accept(listen_sock, (struct sockaddr *)&sunaddr, &len);
 635         } while (sock == -1 && errno == EINTR);
 636
 637         if (sock == -1)
 638                 return;
 639
 640         DEBUG(6,("accepted socket %d\n", sock));
 641
 642         /* Create new connection structure */
 643
 644         if ((state = TALLOC_ZERO_P(NULL, struct winbindd_cli_state)) == NULL) {
 645                 close(sock);
 646                 return;
 647         }
 648
 649         state->sock = sock;
 650
 651         state->last_access = time(NULL);
 652
 653         state->privileged = privileged;
 654
 655         state->fd_event.fd = state->sock;
 656         state->fd_event.flags = 0;
 657         add_fd_event(&state->fd_event);
 658
 659         setup_async_read(&state->fd_event, &state->request, sizeof(uint32),
 660                          request_len_recv, state);
 661
 662         /* Add to connection list */
 663
 664         winbindd_add_client(state);
 665 }
 666
 667 /* Remove a client connection from client connection list */
 668
 669 static void remove_client(struct winbindd_cli_state *state)
 670 {
 671         /* It's a dead client - hold a funeral */
 672
 673         if (state == NULL) {
 674                 return;
 675         }
 676
 677         /* Close socket */
 678
 679         close(state->sock);
 680
 681         /* Free any getent state */
 682
 683         free_getent_state(state->getpwent_state);
 684         free_getent_state(state->getgrent_state);
 685
 686         /* We may have some extra data that was not freed if the client was
 687            killed unexpectedly */
 688
 689         SAFE_FREE(state->response.extra_data.data);
 690
 691         if (state->mem_ctx != NULL) {
 692                 talloc_destroy(state->mem_ctx);
 693                 state->mem_ctx = NULL;
 694         }
 695
 696         remove_fd_event(&state->fd_event);
 697
 698         /* Remove from list and free */
 699
 700         winbindd_remove_client(state);
 701         TALLOC_FREE(state);
 702 }
 703
 704 /* Shutdown client connection which has been idle for the longest time */
 705
 706 static BOOL remove_idle_client(void)
 707 {
 708         struct winbindd_cli_state *state, *remove_state = NULL;
 709         time_t last_access = 0;
 710         int nidle = 0;
 711
 712         for (state = winbindd_client_list(); state; state = state->next) {
 713                 if (state->response.result != WINBINDD_PENDING &&
 714                     !state->getpwent_state && !state->getgrent_state) {
 715                         nidle++;
 716                         if (!last_access || state->last_access < last_access) {
 717                                 last_access = state->last_access;
 718                                 remove_state = state;
 719                         }
 720                 }
 721         }
 722
 723         if (remove_state) {
 724                 DEBUG(5,("Found %d idle client connections, shutting down sock %d, pid %u\n",
 725                         nidle, remove_state->sock, (unsigned int)remove_state->pid));
 726                 remove_client(remove_state);
 727                 return True;
 728         }
 729
 730         return False;
 731 }
 732
 733 /* Process incoming clients on listen_sock.  We use a tricky non-blocking,
 734    non-forking, non-threaded model which allows us to handle many
 735    simultaneous connections while remaining impervious to many denial of
 736    service attacks. */
 737
 738 static int process_loop(int listen_sock, int listen_priv_sock)
 739 {
 740         struct winbindd_cli_state *state;
 741         struct fd_event *ev;
 742         fd_set r_fds, w_fds;
 743         int maxfd, selret;
 744         struct timeval timeout, ev_timeout;
 745
 746         /* We'll be doing this a lot */
 747
 748         /* Handle messages */
 749
 750         message_dispatch(winbind_messaging_context());
 751
 752         run_events(winbind_event_context(), 0, NULL, NULL);
 753
 754         /* refresh the trusted domain cache */
 755
 756         rescan_trusted_domains();
 757
 758         /* Free up temporary memory */
 759
 760         lp_TALLOC_FREE();
 761         main_loop_TALLOC_FREE();
 762
 763         /* Initialise fd lists for select() */
 764
 765         maxfd = MAX(listen_sock, listen_priv_sock);
 766
 767         FD_ZERO(&r_fds);
 768         FD_ZERO(&w_fds);
 769         FD_SET(listen_sock, &r_fds);
 770         FD_SET(listen_priv_sock, &r_fds);
 771
 772         timeout.tv_sec = WINBINDD_ESTABLISH_LOOP;
 773         timeout.tv_usec = 0;
 774
 775         /* Check for any event timeouts. */
 776         if (get_timed_events_timeout(winbind_event_context(), &ev_timeout)) {
 777                 timeout = timeval_min(&timeout, &ev_timeout);
 778         }
 779
 780         /* Set up client readers and writers */
 781
 782         state = winbindd_client_list();
 783
 784         while (state) {
 785
 786                 struct winbindd_cli_state *next = state->next;
 787
 788                 /* Dispose of client connection if it is marked as
 789                    finished */
 790
 791                 if (state->finished)
 792                         remove_client(state);
 793
 794                 state = next;
 795         }
 796
 797         for (ev = fd_events; ev; ev = ev->next) {
 798                 if (ev->flags & EVENT_FD_READ) {
 799                         FD_SET(ev->fd, &r_fds);
 800                         maxfd = MAX(ev->fd, maxfd);
 801                 }
 802                 if (ev->flags & EVENT_FD_WRITE) {
 803                         FD_SET(ev->fd, &w_fds);
 804                         maxfd = MAX(ev->fd, maxfd);
 805                 }
 806         }
 807
 808         /* Call select */
 809
 810         selret = sys_select(maxfd + 1, &r_fds, &w_fds, NULL, &timeout);
 811
 812         if (selret == 0) {
 813                 goto no_fds_ready;
 814         }
 815
 816         if (selret == -1) {
 817                 if (errno == EINTR) {
 818                         goto no_fds_ready;
 819                 }
 820
 821                 /* Select error, something is badly wrong */
 822
 823                 perror("select");
 824                 exit(1);
 825         }
 826
 827         /* selret > 0 */
 828
 829         ev = fd_events;
 830         while (ev != NULL) {
 831                 struct fd_event *next = ev->next;
 832                 int flags = 0;
 833                 if (FD_ISSET(ev->fd, &r_fds))
 834                         flags |= EVENT_FD_READ;
 835                 if (FD_ISSET(ev->fd, &w_fds))
 836                         flags |= EVENT_FD_WRITE;
 837                 if (flags)
 838                         ev->handler(ev, flags);
 839                 ev = next;
 840         }
 841
 842         if (FD_ISSET(listen_sock, &r_fds)) {
 843                 while (winbindd_num_clients() >
 844                        WINBINDD_MAX_SIMULTANEOUS_CLIENTS - 1) {
 845                         DEBUG(5,("winbindd: Exceeding %d client "
 846                                  "connections, removing idle "
 847                                  "connection.\n",
 848                                  WINBINDD_MAX_SIMULTANEOUS_CLIENTS));
 849                         if (!remove_idle_client()) {
 850                                 DEBUG(0,("winbindd: Exceeding %d "
 851                                          "client connections, no idle "
 852                                          "connection found\n",
 853                                          WINBINDD_MAX_SIMULTANEOUS_CLIENTS));
 854                                 break;
 855                         }
 856                 }
 857                 /* new, non-privileged connection */
 858                 new_connection(listen_sock, False);
 859         }
 860
 861         if (FD_ISSET(listen_priv_sock, &r_fds)) {
 862                 while (winbindd_num_clients() >
 863                        WINBINDD_MAX_SIMULTANEOUS_CLIENTS - 1) {
 864                         DEBUG(5,("winbindd: Exceeding %d client "
 865                                  "connections, removing idle "
 866                                  "connection.\n",
 867                                  WINBINDD_MAX_SIMULTANEOUS_CLIENTS));
 868                         if (!remove_idle_client()) {
 869                                 DEBUG(0,("winbindd: Exceeding %d "
 870                                          "client connections, no idle "
 871                                          "connection found\n",
 872                                          WINBINDD_MAX_SIMULTANEOUS_CLIENTS));
 873                                 break;
 874                         }
 875                 }
 876                 /* new, privileged connection */
 877                 new_connection(listen_priv_sock, True);
 878         }
 879
 880  no_fds_ready:
 881
 882 #if 0
 883         winbindd_check_cache_size(time(NULL));
 884 #endif
 885
 886         /* Check signal handling things */
 887
 888         if (do_sigterm)
 889                 terminate();
 890
 891         if (do_sighup) {
 892
 893                 DEBUG(3, ("got SIGHUP\n"));
 894
 895                 flush_caches();
 896                 reload_services_file();
 897
 898                 do_sighup = False;
 899         }
 900
 901         if (do_sigusr2) {
 902                 print_winbindd_status();
 903                 do_sigusr2 = False;
 904         }
 905
 906         if (do_sigchld) {
 907                 pid_t pid;
 908
 909                 do_sigchld = False;
 910
 911                 while ((pid = sys_waitpid(-1, NULL, WNOHANG)) > 0) {
 912                         winbind_child_died(pid);
 913                 }
 914         }
 915
 916
 917         return winbindd_num_clients();
 918 }
 919
 920 static void winbindd_process_loop(enum smb_server_mode server_mode)
 921 {
 922         int idle_timeout_sec;
 923         struct timeval starttime;
 924         int listen_public, listen_priv;
 925
 926         errno = 0;
 927         if (!winbindd_init_sockets(&listen_public, &listen_priv,
 928                                     &idle_timeout_sec)) {
 929                 terminate();
 930         }
 931
 932         starttime = timeval_current();
 933
 934         if (listen_public == -1 || listen_priv == -1) {
 935                 DEBUG(0, ("failed to open winbindd pipes: %s\n",
 936                             errno ? strerror(errno) : "unknown error"));
 937                 terminate();
 938         }
 939
 940         for (;;) {
 941                 int clients = process_loop(listen_public, listen_priv);
 942
 943                 /* Don't bother figuring out the idle time if we won't be
 944                  * timing out anyway.
 945                  */
 946                 if (idle_timeout_sec < 0) {
 947                         continue;
 948                 }
 949
 950                 if (clients == 0 && server_mode == SERVER_MODE_FOREGROUND) {
 951                         struct timeval now;
 952
 953                         now = timeval_current();
 954                         if (timeval_elapsed2(&starttime, &now) >
 955                                 (double)idle_timeout_sec) {
 956                                 DEBUG(0, ("idle for %d secs, exitting\n",
 957                                             idle_timeout_sec));
 958                                 terminate();
 959                         }
 960                 } else {
 961                         starttime = timeval_current();
 962                 }
 963         }
 964 }
 965
 966 /* Main function */
 967
 968 int main(int argc, char **argv, char **envp)
 969 {
 970         pstring logfile;
 971         BOOL log_stdout = False;
 972         BOOL no_process_group = False;
 973
 974         enum smb_server_mode server_mode = SERVER_MODE_DAEMON;
 975
 976         struct poptOption long_options[] = {
 977                 POPT_AUTOHELP
 978                 { "stdout", 'S', POPT_ARG_VAL, &log_stdout, True, "Log to stdout" },
 979                 { "foreground", 'F', POPT_ARG_VAL, &server_mode, SERVER_MODE_FOREGROUND, "Daemon in foreground mode" },
 980                 { "no-process-group", 0, POPT_ARG_VAL, &no_process_group, True, "Don't create a new process group" },
 981                 { "interactive", 'i', POPT_ARG_VAL, &server_mode, SERVER_MODE_INTERACTIVE, "Interactive mode" },
 982                 { "no-caching", 'n', POPT_ARG_VAL, &opt_nocache, True, "Disable caching" },
 983                 POPT_COMMON_SAMBA
 984                 POPT_TABLEEND
 985         };
 986         poptContext pc;
 987         int opt;
 988
 989         /* glibc (?) likes to print "User defined signal 1" and exit if a
 990            SIGUSR[12] is received before a handler is installed */
 991
 992         CatchSignal(SIGUSR1, SIG_IGN);
 993         CatchSignal(SIGUSR2, SIG_IGN);
 994
 995         fault_setup((void (*)(void *))fault_quit );
 996         dump_core_setup("winbindd");
 997
 998         load_case_tables();
 999
1000         /* Initialise for running in non-root mode */
1001
1002         sec_init();
1003
1004         set_remote_machine_name("winbindd", False);
1005
1006         /* Set environment variable so we don't recursively call ourselves.
1007            This may also be useful interactively. */
1008
1009         if ( !winbind_off() ) {
1010                 DEBUG(0,("Failed to disable recusive winbindd calls.  Exiting.\n"));
1011                 exit(1);
1012         }
1013
1014         /* Initialise samba/rpc client stuff */
1015
1016         pc = poptGetContext("winbindd", argc, (const char **)argv, long_options,
1017                                                 POPT_CONTEXT_KEEP_FIRST);
1018
1019         while ((opt = poptGetNextOpt(pc)) != -1) {}
1020
1021         if (server_mode == SERVER_MODE_INTERACTIVE) {
1022                 log_stdout = True;
1023                 if (DEBUGLEVEL >= 9) {
1024                         talloc_enable_leak_report();
1025                 }
1026         }
1027
1028         if (log_stdout && server_mode == SERVER_MODE_DAEMON) {
1029                 printf("Can't log to stdout (-S) unless daemon is in foreground (-F) or interactive (-i)\n");
1030                 poptPrintUsage(pc, stderr, 0);
1031                 exit(1);
1032         }
1033
1034         if (!override_logfile) {
1035                 pstr_sprintf(logfile, "%s/log.winbindd", dyn_LOGFILEBASE);
1036                 lp_set_logfile(logfile);
1037         }
1038         setup_logging("winbindd", log_stdout);
1039         reopen_logs();
1040
1041         DEBUG(1, ("winbindd version %s started.\n%s\n",
1042                   SAMBA_VERSION_STRING,
1043                   COPYRIGHT_STARTUP_MESSAGE) );
1044
1045         if (!reload_services_file()) {
1046                 DEBUG(0, ("error opening config file\n"));
1047                 exit(1);
1048         }
1049
1050         if (!directory_exist(lp_lockdir(), NULL)) {
1051                 mkdir(lp_lockdir(), 0755);
1052         }
1053
1054         /* Setup names. */
1055
1056         if (!init_names())
1057                 exit(1);
1058
1059         load_interfaces();
1060
1061         if (!secrets_init()) {
1062
1063                 DEBUG(0,("Could not initialize domain trust account secrets. Giving up\n"));
1064                 return False;
1065         }
1066
1067         /* Enable netbios namecache */
1068
1069         namecache_enable();
1070
1071         /* Winbind daemon initialisation */
1072
1073         if ( ! NT_STATUS_IS_OK(idmap_init_cache()) ) {
1074                 DEBUG(1, ("Could not init idmap cache!\n"));
1075         }
1076
1077         /* Unblock all signals we are interested in as they may have been
1078            blocked by the parent process. */
1079
1080         BlockSignals(False, SIGINT);
1081         BlockSignals(False, SIGQUIT);
1082         BlockSignals(False, SIGTERM);
1083         BlockSignals(False, SIGUSR1);
1084         BlockSignals(False, SIGUSR2);
1085         BlockSignals(False, SIGHUP);
1086         BlockSignals(False, SIGCHLD);
1087
1088         /* Setup signal handlers */
1089
1090         CatchSignal(SIGINT, termination_handler);      /* Exit on these sigs */
1091         CatchSignal(SIGQUIT, termination_handler);
1092         CatchSignal(SIGTERM, termination_handler);
1093         CatchSignal(SIGCHLD, sigchld_handler);
1094
1095         CatchSignal(SIGPIPE, SIG_IGN);                 /* Ignore sigpipe */
1096
1097         CatchSignal(SIGUSR2, sigusr2_handler);         /* Debugging sigs */
1098         CatchSignal(SIGHUP, sighup_handler);
1099
1100         if (server_mode == SERVER_MODE_DAEMON) {
1101                 DEBUG( 3, ( "Becoming a daemon.\n" ) );
1102                 become_daemon(True, no_process_group);
1103         } else if (server_mode == SERVER_MODE_FOREGROUND) {
1104                 become_daemon(False, no_process_group);
1105         }
1106
1107         pidfile_create("winbindd");
1108
1109         /* Ensure all cache and idmap caches are consistent
1110            before we startup. */
1111
1112         if (winbindd_validate_cache()) {
1113                 /* We have a bad cache, but luckily we
1114                    just deleted it. Restart ourselves */
1115                 int i;
1116                 /* Ensure we have no open low fd's. */
1117                 for (i = 3; i < 100; i++) {
1118                         close(i);
1119                 }
1120                 return execve(argv[0], argv, envp);
1121         }
1122
1123 #if HAVE_SETPGID
1124         /*
1125          * If we're interactive we want to set our own process group for
1126          * signal management.
1127          */
1128         if (server_mode == SERVER_MODE_INTERACTIVE && !no_process_group) {
1129                 setpgid( (pid_t)0, (pid_t)0);
1130         }
1131 #endif
1132
1133         TimeInit();
1134
1135         /* Initialise messaging system */
1136
1137         if (winbind_messaging_context() == NULL) {
1138                 DEBUG(0, ("unable to initialize messaging system\n"));
1139                 exit(1);
1140         }
1141
1142         /* Initialize cache (ensure version is correct). */
1143         if (!initialize_winbindd_cache()) {
1144                 exit(1);
1145         }
1146
1147         /* React on 'smbcontrol winbindd reload-config' in the same way
1148            as to SIGHUP signal */
1149         messaging_register(winbind_messaging_context(), NULL,
1150                            MSG_SMB_CONF_UPDATED, msg_reload_services);
1151         messaging_register(winbind_messaging_context(), NULL,
1152                            MSG_SHUTDOWN, msg_shutdown);
1153
1154         /* Handle online/offline messages. */
1155         messaging_register(winbind_messaging_context(), NULL,
1156                            MSG_WINBIND_OFFLINE, winbind_msg_offline);
1157         messaging_register(winbind_messaging_context(), NULL,
1158                            MSG_WINBIND_ONLINE, winbind_msg_online);
1159         messaging_register(winbind_messaging_context(), NULL,
1160                            MSG_WINBIND_ONLINESTATUS, winbind_msg_onlinestatus);
1161
1162         poptFreeContext(pc);
1163
1164         netsamlogon_cache_init(); /* Non-critical */
1165
1166         /* clear the cached list of trusted domains */
1167
1168         wcache_tdc_clear();
1169
1170         if (!init_domain_list()) {
1171                 DEBUG(0,("unable to initalize domain list\n"));
1172                 exit(1);
1173         }
1174
1175         init_idmap_child();
1176
1177         smb_nscd_flush_user_cache();
1178         smb_nscd_flush_group_cache();
1179
1180         /* Loop waiting for requests */
1181         winbindd_process_loop(server_mode);
1182
1183         return 0;
1184 }