source/nsswitch/winbindd.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3
   4    Winbind daemon for ntdom nss module
   5
   6    Copyright (C) by Tim Potter 2000-2002
   7    Copyright (C) Andrew Tridgell 2002
   8    Copyright (C) Jelmer Vernooij 2003
   9    Copyright (C) Volker Lendecke 2004
  10
  11    This program is free software; you can redistribute it and/or modify
  12    it under the terms of the GNU General Public License as published by
  13    the Free Software Foundation; either version 2 of the License, or
  14    (at your option) any later version.
  15
  16    This program is distributed in the hope that it will be useful,
  17    but WITHOUT ANY WARRANTY; without even the implied warranty of
  18    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19    GNU General Public License for more details.
  20
  21    You should have received a copy of the GNU General Public License
  22    along with this program; if not, write to the Free Software
  23    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  24 */
  25
  26 #include "includes.h"
  27 #include "winbindd.h"
  28
  29 #undef DBGC_CLASS
  30 #define DBGC_CLASS DBGC_WINBIND
  31
  32 BOOL opt_nocache = False;
  33 static BOOL interactive = False;
  34
  35 extern BOOL override_logfile;
  36
  37 struct event_context *winbind_event_context(void)
  38 {
  39         static struct event_context *ctx;
  40
  41         if (!ctx && !(ctx = event_context_init(NULL))) {
  42                 smb_panic("Could not init winbind event context\n");
  43         }
  44         return ctx;
  45 }
  46
  47 /* Reload configuration */
  48
  49 static BOOL reload_services_file(void)
  50 {
  51         BOOL ret;
  52
  53         if (lp_loaded()) {
  54                 pstring fname;
  55
  56                 pstrcpy(fname,lp_configfile());
  57                 if (file_exist(fname,NULL) && !strcsequal(fname,dyn_CONFIGFILE)) {
  58                         pstrcpy(dyn_CONFIGFILE,fname);
  59                 }
  60         }
  61
  62         reopen_logs();
  63         ret = lp_load(dyn_CONFIGFILE,False,False,True,True);
  64
  65         reopen_logs();
  66         load_interfaces();
  67
  68         return(ret);
  69 }
  70
  71
  72 /**************************************************************************** **
  73  Handle a fault..
  74  **************************************************************************** */
  75
  76 static void fault_quit(void)
  77 {
  78         dump_core();
  79 }
  80
  81 static void winbindd_status(void)
  82 {
  83         struct winbindd_cli_state *tmp;
  84
  85         DEBUG(0, ("winbindd status:\n"));
  86
  87         /* Print client state information */
  88
  89         DEBUG(0, ("\t%d clients currently active\n", winbindd_num_clients()));
  90
  91         if (DEBUGLEVEL >= 2 && winbindd_num_clients()) {
  92                 DEBUG(2, ("\tclient list:\n"));
  93                 for(tmp = winbindd_client_list(); tmp; tmp = tmp->next) {
  94                         DEBUGADD(2, ("\t\tpid %lu, sock %d\n",
  95                                   (unsigned long)tmp->pid, tmp->sock));
  96                 }
  97         }
  98 }
  99
 100 /* Print winbindd status to log file */
 101
 102 static void print_winbindd_status(void)
 103 {
 104         winbindd_status();
 105 }
 106
 107 /* Flush client cache */
 108
 109 static void flush_caches(void)
 110 {
 111         /* We need to invalidate cached user list entries on a SIGHUP
 112            otherwise cached access denied errors due to restrict anonymous
 113            hang around until the sequence number changes. */
 114
 115         wcache_invalidate_cache();
 116 }
 117
 118 /* Handle the signal by unlinking socket and exiting */
 119
 120 static void terminate(void)
 121 {
 122         pstring path;
 123
 124         /* Remove socket file */
 125         pstr_sprintf(path, "%s/%s",
 126                  WINBINDD_SOCKET_DIR, WINBINDD_SOCKET_NAME);
 127         unlink(path);
 128
 129         idmap_close();
 130
 131         trustdom_cache_shutdown();
 132
 133 #if 0
 134         if (interactive) {
 135                 TALLOC_CTX *mem_ctx = talloc_init("end_description");
 136                 char *description = talloc_describe_all(mem_ctx);
 137
 138                 DEBUG(3, ("tallocs left:\n%s\n", description));
 139                 talloc_destroy(mem_ctx);
 140         }
 141 #endif
 142
 143         exit(0);
 144 }
 145
 146 static BOOL do_sigterm;
 147
 148 static void termination_handler(int signum)
 149 {
 150         do_sigterm = True;
 151         sys_select_signal(signum);
 152 }
 153
 154 static BOOL do_sigusr2;
 155
 156 static void sigusr2_handler(int signum)
 157 {
 158         do_sigusr2 = True;
 159         sys_select_signal(SIGUSR2);
 160 }
 161
 162 static BOOL do_sighup;
 163
 164 static void sighup_handler(int signum)
 165 {
 166         do_sighup = True;
 167         sys_select_signal(SIGHUP);
 168 }
 169
 170 static BOOL do_sigchld;
 171
 172 static void sigchld_handler(int signum)
 173 {
 174         do_sigchld = True;
 175         sys_select_signal(SIGCHLD);
 176 }
 177
 178 /* React on 'smbcontrol winbindd reload-config' in the same way as on SIGHUP*/
 179 static void msg_reload_services(int msg_type, struct process_id src,
 180                                 void *buf, size_t len, void *private_data)
 181 {
 182         /* Flush various caches */
 183         flush_caches();
 184         reload_services_file();
 185 }
 186
 187 /* React on 'smbcontrol winbindd shutdown' in the same way as on SIGTERM*/
 188 static void msg_shutdown(int msg_type, struct process_id src,
 189                          void *buf, size_t len, void *private_data)
 190 {
 191         do_sigterm = True;
 192 }
 193
 194 static struct winbindd_dispatch_table {
 195         enum winbindd_cmd cmd;
 196         void (*fn)(struct winbindd_cli_state *state);
 197         const char *winbindd_cmd_name;
 198 } dispatch_table[] = {
 199
 200         /* User functions */
 201
 202         { WINBINDD_GETPWNAM, winbindd_getpwnam, "GETPWNAM" },
 203         { WINBINDD_GETPWUID, winbindd_getpwuid, "GETPWUID" },
 204
 205         { WINBINDD_SETPWENT, winbindd_setpwent, "SETPWENT" },
 206         { WINBINDD_ENDPWENT, winbindd_endpwent, "ENDPWENT" },
 207         { WINBINDD_GETPWENT, winbindd_getpwent, "GETPWENT" },
 208
 209         { WINBINDD_GETGROUPS, winbindd_getgroups, "GETGROUPS" },
 210         { WINBINDD_GETUSERSIDS, winbindd_getusersids, "GETUSERSIDS" },
 211         { WINBINDD_GETUSERDOMGROUPS, winbindd_getuserdomgroups,
 212           "GETUSERDOMGROUPS" },
 213
 214         /* Group functions */
 215
 216         { WINBINDD_GETGRNAM, winbindd_getgrnam, "GETGRNAM" },
 217         { WINBINDD_GETGRGID, winbindd_getgrgid, "GETGRGID" },
 218         { WINBINDD_SETGRENT, winbindd_setgrent, "SETGRENT" },
 219         { WINBINDD_ENDGRENT, winbindd_endgrent, "ENDGRENT" },
 220         { WINBINDD_GETGRENT, winbindd_getgrent, "GETGRENT" },
 221         { WINBINDD_GETGRLST, winbindd_getgrent, "GETGRLST" },
 222
 223         /* PAM auth functions */
 224
 225         { WINBINDD_PAM_AUTH, winbindd_pam_auth, "PAM_AUTH" },
 226         { WINBINDD_PAM_AUTH_CRAP, winbindd_pam_auth_crap, "AUTH_CRAP" },
 227         { WINBINDD_PAM_CHAUTHTOK, winbindd_pam_chauthtok, "CHAUTHTOK" },
 228         { WINBINDD_PAM_LOGOFF, winbindd_pam_logoff, "PAM_LOGOFF" },
 229         { WINBINDD_PAM_CHNG_PSWD_AUTH_CRAP, winbindd_pam_chng_pswd_auth_crap, "CHNG_PSWD_AUTH_CRAP" },
 230
 231         /* Enumeration functions */
 232
 233         { WINBINDD_LIST_USERS, winbindd_list_users, "LIST_USERS" },
 234         { WINBINDD_LIST_GROUPS, winbindd_list_groups, "LIST_GROUPS" },
 235         { WINBINDD_LIST_TRUSTDOM, winbindd_list_trusted_domains,
 236           "LIST_TRUSTDOM" },
 237         { WINBINDD_SHOW_SEQUENCE, winbindd_show_sequence, "SHOW_SEQUENCE" },
 238
 239         /* SID related functions */
 240
 241         { WINBINDD_LOOKUPSID, winbindd_lookupsid, "LOOKUPSID" },
 242         { WINBINDD_LOOKUPNAME, winbindd_lookupname, "LOOKUPNAME" },
 243         { WINBINDD_LOOKUPRIDS, winbindd_lookuprids, "LOOKUPRIDS" },
 244
 245         /* Lookup related functions */
 246
 247         { WINBINDD_SID_TO_UID, winbindd_sid_to_uid, "SID_TO_UID" },
 248         { WINBINDD_SID_TO_GID, winbindd_sid_to_gid, "SID_TO_GID" },
 249         { WINBINDD_UID_TO_SID, winbindd_uid_to_sid, "UID_TO_SID" },
 250         { WINBINDD_GID_TO_SID, winbindd_gid_to_sid, "GID_TO_SID" },
 251 #if 0   /* DISABLED until we fix the interface in Samba 3.0.26 --jerry */
 252         { WINBINDD_SIDS_TO_XIDS, winbindd_sids_to_unixids, "SIDS_TO_XIDS" },
 253 #endif  /* end DISABLED */
 254         { WINBINDD_ALLOCATE_UID, winbindd_allocate_uid, "ALLOCATE_UID" },
 255         { WINBINDD_ALLOCATE_GID, winbindd_allocate_gid, "ALLOCATE_GID" },
 256         { WINBINDD_SET_MAPPING, winbindd_set_mapping, "SET_MAPPING" },
 257         { WINBINDD_SET_HWM, winbindd_set_hwm, "SET_HWMS" },
 258
 259         /* Miscellaneous */
 260
 261         { WINBINDD_DUMP_MAPS, winbindd_dump_maps, "DUMP_MAPS" },
 262
 263         { WINBINDD_CHECK_MACHACC, winbindd_check_machine_acct, "CHECK_MACHACC" },
 264         { WINBINDD_PING, winbindd_ping, "PING" },
 265         { WINBINDD_INFO, winbindd_info, "INFO" },
 266         { WINBINDD_INTERFACE_VERSION, winbindd_interface_version,
 267           "INTERFACE_VERSION" },
 268         { WINBINDD_DOMAIN_NAME, winbindd_domain_name, "DOMAIN_NAME" },
 269         { WINBINDD_DOMAIN_INFO, winbindd_domain_info, "DOMAIN_INFO" },
 270         { WINBINDD_NETBIOS_NAME, winbindd_netbios_name, "NETBIOS_NAME" },
 271         { WINBINDD_PRIV_PIPE_DIR, winbindd_priv_pipe_dir,
 272           "WINBINDD_PRIV_PIPE_DIR" },
 273         { WINBINDD_GETDCNAME, winbindd_getdcname, "GETDCNAME" },
 274
 275         /* Credential cache access */
 276         { WINBINDD_CCACHE_NTLMAUTH, winbindd_ccache_ntlm_auth, "NTLMAUTH" },
 277
 278         /* WINS functions */
 279
 280         { WINBINDD_WINS_BYNAME, winbindd_wins_byname, "WINS_BYNAME" },
 281         { WINBINDD_WINS_BYIP, winbindd_wins_byip, "WINS_BYIP" },
 282
 283         /* End of list */
 284
 285         { WINBINDD_NUM_CMDS, NULL, "NONE" }
 286 };
 287
 288 static void process_request(struct winbindd_cli_state *state)
 289 {
 290         struct winbindd_dispatch_table *table = dispatch_table;
 291
 292         /* Free response data - we may be interrupted and receive another
 293            command before being able to send this data off. */
 294
 295         SAFE_FREE(state->response.extra_data.data);
 296
 297         ZERO_STRUCT(state->response);
 298
 299         state->response.result = WINBINDD_PENDING;
 300         state->response.length = sizeof(struct winbindd_response);
 301
 302         state->mem_ctx = talloc_init("winbind request");
 303         if (state->mem_ctx == NULL)
 304                 return;
 305
 306         /* Remember who asked us. */
 307         state->pid = state->request.pid;
 308
 309         /* Process command */
 310
 311         for (table = dispatch_table; table->fn; table++) {
 312                 if (state->request.cmd == table->cmd) {
 313                         DEBUG(10,("process_request: request fn %s\n",
 314                                   table->winbindd_cmd_name ));
 315                         table->fn(state);
 316                         break;
 317                 }
 318         }
 319
 320         if (!table->fn) {
 321                 DEBUG(10,("process_request: unknown request fn number %d\n",
 322                           (int)state->request.cmd ));
 323                 request_error(state);
 324         }
 325 }
 326
 327 /*
 328  * A list of file descriptors being monitored by select in the main processing
 329  * loop. fd_event->handler is called whenever the socket is readable/writable.
 330  */
 331
 332 static struct fd_event *fd_events = NULL;
 333
 334 void add_fd_event(struct fd_event *ev)
 335 {
 336         struct fd_event *match;
 337
 338         /* only add unique fd_event structs */
 339
 340         for (match=fd_events; match; match=match->next ) {
 341 #ifdef DEVELOPER
 342                 SMB_ASSERT( match != ev );
 343 #else
 344                 if ( match == ev )
 345                         return;
 346 #endif
 347         }
 348
 349         DLIST_ADD(fd_events, ev);
 350 }
 351
 352 void remove_fd_event(struct fd_event *ev)
 353 {
 354         DLIST_REMOVE(fd_events, ev);
 355 }
 356
 357 /*
 358  * Handler for fd_events to complete a read/write request, set up by
 359  * setup_async_read/setup_async_write.
 360  */
 361
 362 static void rw_callback(struct fd_event *event, int flags)
 363 {
 364         size_t todo;
 365         ssize_t done = 0;
 366
 367         todo = event->length - event->done;
 368
 369         if (event->flags & EVENT_FD_WRITE) {
 370                 SMB_ASSERT(flags == EVENT_FD_WRITE);
 371                 done = sys_write(event->fd,
 372                                  &((char *)event->data)[event->done],
 373                                  todo);
 374
 375                 if (done <= 0) {
 376                         event->flags = 0;
 377                         event->finished(event->private_data, False);
 378                         return;
 379                 }
 380         }
 381
 382         if (event->flags & EVENT_FD_READ) {
 383                 SMB_ASSERT(flags == EVENT_FD_READ);
 384                 done = sys_read(event->fd, &((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         event->done += done;
 395
 396         if (event->done == event->length) {
 397                 event->flags = 0;
 398                 event->finished(event->private_data, True);
 399         }
 400 }
 401
 402 /*
 403  * Request an async read/write on a fd_event structure. (*finished) is called
 404  * when the request is completed or an error had occurred.
 405  */
 406
 407 void setup_async_read(struct fd_event *event, void *data, size_t length,
 408                       void (*finished)(void *private_data, BOOL success),
 409                       void *private_data)
 410 {
 411         SMB_ASSERT(event->flags == 0);
 412         event->data = data;
 413         event->length = length;
 414         event->done = 0;
 415         event->handler = rw_callback;
 416         event->finished = finished;
 417         event->private_data = private_data;
 418         event->flags = EVENT_FD_READ;
 419 }
 420
 421 void setup_async_write(struct fd_event *event, void *data, size_t length,
 422                        void (*finished)(void *private_data, BOOL success),
 423                        void *private_data)
 424 {
 425         SMB_ASSERT(event->flags == 0);
 426         event->data = data;
 427         event->length = length;
 428         event->done = 0;
 429         event->handler = rw_callback;
 430         event->finished = finished;
 431         event->private_data = private_data;
 432         event->flags = EVENT_FD_WRITE;
 433 }
 434
 435 /*
 436  * This is the main event loop of winbind requests. It goes through a
 437  * state-machine of 3 read/write requests, 4 if you have extra data to send.
 438  *
 439  * An idle winbind client has a read request of 4 bytes outstanding,
 440  * finalizing function is request_len_recv, checking the length. request_recv
 441  * then processes the packet. The processing function then at some point has
 442  * to call request_finished which schedules sending the response.
 443  */
 444
 445 static void request_len_recv(void *private_data, BOOL success);
 446 static void request_recv(void *private_data, BOOL success);
 447 static void request_main_recv(void *private_data, BOOL success);
 448 static void request_finished(struct winbindd_cli_state *state);
 449 void request_finished_cont(void *private_data, BOOL success);
 450 static void response_main_sent(void *private_data, BOOL success);
 451 static void response_extra_sent(void *private_data, BOOL success);
 452
 453 static void response_extra_sent(void *private_data, BOOL success)
 454 {
 455         struct winbindd_cli_state *state =
 456                 talloc_get_type_abort(private_data, struct winbindd_cli_state);
 457
 458         if (state->mem_ctx != NULL) {
 459                 talloc_destroy(state->mem_ctx);
 460                 state->mem_ctx = NULL;
 461         }
 462
 463         if (!success) {
 464                 state->finished = True;
 465                 return;
 466         }
 467
 468         SAFE_FREE(state->request.extra_data.data);
 469         SAFE_FREE(state->response.extra_data.data);
 470
 471         setup_async_read(&state->fd_event, &state->request, sizeof(uint32),
 472                          request_len_recv, state);
 473 }
 474
 475 static void response_main_sent(void *private_data, BOOL success)
 476 {
 477         struct winbindd_cli_state *state =
 478                 talloc_get_type_abort(private_data, struct winbindd_cli_state);
 479
 480         if (!success) {
 481                 state->finished = True;
 482                 return;
 483         }
 484
 485         if (state->response.length == sizeof(state->response)) {
 486                 if (state->mem_ctx != NULL) {
 487                         talloc_destroy(state->mem_ctx);
 488                         state->mem_ctx = NULL;
 489                 }
 490
 491                 setup_async_read(&state->fd_event, &state->request,
 492                                  sizeof(uint32), request_len_recv, state);
 493                 return;
 494         }
 495
 496         setup_async_write(&state->fd_event, state->response.extra_data.data,
 497                           state->response.length - sizeof(state->response),
 498                           response_extra_sent, state);
 499 }
 500
 501 static void request_finished(struct winbindd_cli_state *state)
 502 {
 503         setup_async_write(&state->fd_event, &state->response,
 504                           sizeof(state->response), response_main_sent, state);
 505 }
 506
 507 void request_error(struct winbindd_cli_state *state)
 508 {
 509         SMB_ASSERT(state->response.result == WINBINDD_PENDING);
 510         state->response.result = WINBINDD_ERROR;
 511         request_finished(state);
 512 }
 513
 514 void request_ok(struct winbindd_cli_state *state)
 515 {
 516         SMB_ASSERT(state->response.result == WINBINDD_PENDING);
 517         state->response.result = WINBINDD_OK;
 518         request_finished(state);
 519 }
 520
 521 void request_finished_cont(void *private_data, BOOL success)
 522 {
 523         struct winbindd_cli_state *state =
 524                 talloc_get_type_abort(private_data, struct winbindd_cli_state);
 525
 526         if (success)
 527                 request_ok(state);
 528         else
 529                 request_error(state);
 530 }
 531
 532 static void request_len_recv(void *private_data, BOOL success)
 533 {
 534         struct winbindd_cli_state *state =
 535                 talloc_get_type_abort(private_data, struct winbindd_cli_state);
 536
 537         if (!success) {
 538                 state->finished = True;
 539                 return;
 540         }
 541
 542         if (*(uint32 *)(&state->request) != sizeof(state->request)) {
 543                 DEBUG(0,("request_len_recv: Invalid request size received: %d (expected %d)\n",
 544                          *(uint32 *)(&state->request), (uint32)sizeof(state->request)));
 545                 state->finished = True;
 546                 return;
 547         }
 548
 549         setup_async_read(&state->fd_event, (uint32 *)(&state->request)+1,
 550                          sizeof(state->request) - sizeof(uint32),
 551                          request_main_recv, state);
 552 }
 553
 554 static void request_main_recv(void *private_data, BOOL success)
 555 {
 556         struct winbindd_cli_state *state =
 557                 talloc_get_type_abort(private_data, struct winbindd_cli_state);
 558
 559         if (!success) {
 560                 state->finished = True;
 561                 return;
 562         }
 563
 564         if (state->request.extra_len == 0) {
 565                 state->request.extra_data.data = NULL;
 566                 request_recv(state, True);
 567                 return;
 568         }
 569
 570         if ((!state->privileged) &&
 571             (state->request.extra_len > WINBINDD_MAX_EXTRA_DATA)) {
 572                 DEBUG(3, ("Got request with %d bytes extra data on "
 573                           "unprivileged socket\n", (int)state->request.extra_len));
 574                 state->request.extra_data.data = NULL;
 575                 state->finished = True;
 576                 return;
 577         }
 578
 579         state->request.extra_data.data =
 580                 SMB_MALLOC_ARRAY(char, state->request.extra_len + 1);
 581
 582         if (state->request.extra_data.data == NULL) {
 583                 DEBUG(0, ("malloc failed\n"));
 584                 state->finished = True;
 585                 return;
 586         }
 587
 588         /* Ensure null termination */
 589         state->request.extra_data.data[state->request.extra_len] = '\0';
 590
 591         setup_async_read(&state->fd_event, state->request.extra_data.data,
 592                          state->request.extra_len, request_recv, state);
 593 }
 594
 595 static void request_recv(void *private_data, BOOL success)
 596 {
 597         struct winbindd_cli_state *state =
 598                 talloc_get_type_abort(private_data, struct winbindd_cli_state);
 599
 600         if (!success) {
 601                 state->finished = True;
 602                 return;
 603         }
 604
 605         process_request(state);
 606 }
 607
 608 /* Process a new connection by adding it to the client connection list */
 609
 610 static void new_connection(int listen_sock, BOOL privileged)
 611 {
 612         struct sockaddr_un sunaddr;
 613         struct winbindd_cli_state *state;
 614         socklen_t len;
 615         int sock;
 616
 617         /* Accept connection */
 618
 619         len = sizeof(sunaddr);
 620
 621         do {
 622                 sock = accept(listen_sock, (struct sockaddr *)&sunaddr, &len);
 623         } while (sock == -1 && errno == EINTR);
 624
 625         if (sock == -1)
 626                 return;
 627
 628         DEBUG(6,("accepted socket %d\n", sock));
 629
 630         /* Create new connection structure */
 631
 632         if ((state = TALLOC_ZERO_P(NULL, struct winbindd_cli_state)) == NULL) {
 633                 close(sock);
 634                 return;
 635         }
 636
 637         state->sock = sock;
 638
 639         state->last_access = time(NULL);
 640
 641         state->privileged = privileged;
 642
 643         state->fd_event.fd = state->sock;
 644         state->fd_event.flags = 0;
 645         add_fd_event(&state->fd_event);
 646
 647         setup_async_read(&state->fd_event, &state->request, sizeof(uint32),
 648                          request_len_recv, state);
 649
 650         /* Add to connection list */
 651
 652         winbindd_add_client(state);
 653 }
 654
 655 /* Remove a client connection from client connection list */
 656
 657 static void remove_client(struct winbindd_cli_state *state)
 658 {
 659         /* It's a dead client - hold a funeral */
 660
 661         if (state == NULL) {
 662                 return;
 663         }
 664
 665         /* Close socket */
 666
 667         close(state->sock);
 668
 669         /* Free any getent state */
 670
 671         free_getent_state(state->getpwent_state);
 672         free_getent_state(state->getgrent_state);
 673
 674         /* We may have some extra data that was not freed if the client was
 675            killed unexpectedly */
 676
 677         SAFE_FREE(state->response.extra_data.data);
 678
 679         if (state->mem_ctx != NULL) {
 680                 talloc_destroy(state->mem_ctx);
 681                 state->mem_ctx = NULL;
 682         }
 683
 684         remove_fd_event(&state->fd_event);
 685
 686         /* Remove from list and free */
 687
 688         winbindd_remove_client(state);
 689         TALLOC_FREE(state);
 690 }
 691
 692 /* Shutdown client connection which has been idle for the longest time */
 693
 694 static BOOL remove_idle_client(void)
 695 {
 696         struct winbindd_cli_state *state, *remove_state = NULL;
 697         time_t last_access = 0;
 698         int nidle = 0;
 699
 700         for (state = winbindd_client_list(); state; state = state->next) {
 701                 if (state->response.result != WINBINDD_PENDING &&
 702                     !state->getpwent_state && !state->getgrent_state) {
 703                         nidle++;
 704                         if (!last_access || state->last_access < last_access) {
 705                                 last_access = state->last_access;
 706                                 remove_state = state;
 707                         }
 708                 }
 709         }
 710
 711         if (remove_state) {
 712                 DEBUG(5,("Found %d idle client connections, shutting down sock %d, pid %u\n",
 713                         nidle, remove_state->sock, (unsigned int)remove_state->pid));
 714                 remove_client(remove_state);
 715                 return True;
 716         }
 717
 718         return False;
 719 }
 720
 721 /* Process incoming clients on listen_sock.  We use a tricky non-blocking,
 722    non-forking, non-threaded model which allows us to handle many
 723    simultaneous connections while remaining impervious to many denial of
 724    service attacks. */
 725
 726 static void process_loop(void)
 727 {
 728         struct winbindd_cli_state *state;
 729         struct fd_event *ev;
 730         fd_set r_fds, w_fds;
 731         int maxfd, listen_sock, listen_priv_sock, selret;
 732         struct timeval timeout, ev_timeout;
 733
 734         /* Open Sockets here to get stuff going ASAP */
 735         listen_sock = open_winbindd_socket();
 736         listen_priv_sock = open_winbindd_priv_socket();
 737
 738         if (listen_sock == -1 || listen_priv_sock == -1) {
 739                 perror("open_winbind_socket");
 740                 exit(1);
 741         }
 742
 743         /* We'll be doing this a lot */
 744
 745         /* Handle messages */
 746
 747         message_dispatch();
 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                 msg_reload_services(MSG_SMB_CONF_UPDATED, pid_to_procid(0), NULL, 0, NULL);
 893                 do_sighup = False;
 894         }
 895
 896         if (do_sigusr2) {
 897                 print_winbindd_status();
 898                 do_sigusr2 = False;
 899         }
 900
 901         if (do_sigchld) {
 902                 pid_t pid;
 903
 904                 do_sigchld = False;
 905
 906                 while ((pid = sys_waitpid(-1, NULL, WNOHANG)) > 0) {
 907                         winbind_child_died(pid);
 908                 }
 909         }
 910 }
 911
 912 /* Main function */
 913
 914 int main(int argc, char **argv, char **envp)
 915 {
 916         pstring logfile;
 917         static BOOL Fork = True;
 918         static BOOL log_stdout = False;
 919         static BOOL no_process_group = False;
 920         struct poptOption long_options[] = {
 921                 POPT_AUTOHELP
 922                 { "stdout", 'S', POPT_ARG_VAL, &log_stdout, True, "Log to stdout" },
 923                 { "foreground", 'F', POPT_ARG_VAL, &Fork, False, "Daemon in foreground mode" },
 924                 { "no-process-group", 0, POPT_ARG_VAL, &no_process_group, True, "Don't create a new process group" },
 925                 { "interactive", 'i', POPT_ARG_NONE, NULL, 'i', "Interactive mode" },
 926                 { "no-caching", 'n', POPT_ARG_VAL, &opt_nocache, True, "Disable caching" },
 927                 POPT_COMMON_SAMBA
 928                 POPT_TABLEEND
 929         };
 930         poptContext pc;
 931         int opt;
 932
 933         /* glibc (?) likes to print "User defined signal 1" and exit if a
 934            SIGUSR[12] is received before a handler is installed */
 935
 936         CatchSignal(SIGUSR1, SIG_IGN);
 937         CatchSignal(SIGUSR2, SIG_IGN);
 938
 939         fault_setup((void (*)(void *))fault_quit );
 940         dump_core_setup("winbindd");
 941
 942         load_case_tables();
 943
 944         /* Initialise for running in non-root mode */
 945
 946         sec_init();
 947
 948         set_remote_machine_name("winbindd", False);
 949
 950         /* Set environment variable so we don't recursively call ourselves.
 951            This may also be useful interactively. */
 952
 953         if ( !winbind_off() ) {
 954                 DEBUG(0,("Failed to disable recusive winbindd calls.  Exiting.\n"));
 955                 exit(1);
 956         }
 957
 958         /* Initialise samba/rpc client stuff */
 959
 960         pc = poptGetContext("winbindd", argc, (const char **)argv, long_options,
 961                                                 POPT_CONTEXT_KEEP_FIRST);
 962
 963         while ((opt = poptGetNextOpt(pc)) != -1) {
 964                 switch (opt) {
 965                         /* Don't become a daemon */
 966                 case 'i':
 967                         interactive = True;
 968                         log_stdout = True;
 969                         Fork = False;
 970                         break;
 971                 }
 972         }
 973
 974
 975         if (log_stdout && Fork) {
 976                 printf("Can't log to stdout (-S) unless daemon is in foreground +(-F) or interactive (-i)\n");
 977                 poptPrintUsage(pc, stderr, 0);
 978                 exit(1);
 979         }
 980
 981         if (!override_logfile) {
 982                 pstr_sprintf(logfile, "%s/log.winbindd", dyn_LOGFILEBASE);
 983                 lp_set_logfile(logfile);
 984         }
 985         setup_logging("winbindd", log_stdout);
 986         reopen_logs();
 987
 988         DEBUG(1, ("winbindd version %s started.\n%s\n",
 989                   SAMBA_VERSION_STRING,
 990                   COPYRIGHT_STARTUP_MESSAGE) );
 991
 992         if (!reload_services_file()) {
 993                 DEBUG(0, ("error opening config file\n"));
 994                 exit(1);
 995         }
 996
 997         if (!directory_exist(lp_lockdir(), NULL)) {
 998                 mkdir(lp_lockdir(), 0755);
 999         }
1000
1001         /* Setup names. */
1002
1003         if (!init_names())
1004                 exit(1);
1005
1006         load_interfaces();
1007
1008         if (!secrets_init()) {
1009
1010                 DEBUG(0,("Could not initialize domain trust account secrets. Giving up\n"));
1011                 return False;
1012         }
1013
1014         /* Enable netbios namecache */
1015
1016         namecache_enable();
1017
1018         /* Winbind daemon initialisation */
1019
1020         if ( ! NT_STATUS_IS_OK(idmap_init_cache()) ) {
1021                 DEBUG(1, ("Could not init idmap cache!\n"));
1022         }
1023
1024         /* Unblock all signals we are interested in as they may have been
1025            blocked by the parent process. */
1026
1027         BlockSignals(False, SIGINT);
1028         BlockSignals(False, SIGQUIT);
1029         BlockSignals(False, SIGTERM);
1030         BlockSignals(False, SIGUSR1);
1031         BlockSignals(False, SIGUSR2);
1032         BlockSignals(False, SIGHUP);
1033         BlockSignals(False, SIGCHLD);
1034
1035         /* Setup signal handlers */
1036
1037         CatchSignal(SIGINT, termination_handler);      /* Exit on these sigs */
1038         CatchSignal(SIGQUIT, termination_handler);
1039         CatchSignal(SIGTERM, termination_handler);
1040         CatchSignal(SIGCHLD, sigchld_handler);
1041
1042         CatchSignal(SIGPIPE, SIG_IGN);                 /* Ignore sigpipe */
1043
1044         CatchSignal(SIGUSR2, sigusr2_handler);         /* Debugging sigs */
1045         CatchSignal(SIGHUP, sighup_handler);
1046
1047         if (!interactive)
1048                 become_daemon(Fork, no_process_group);
1049
1050         pidfile_create("winbindd");
1051
1052 #if HAVE_SETPGID
1053         /*
1054          * If we're interactive we want to set our own process group for
1055          * signal management.
1056          */
1057         if (interactive && !no_process_group)
1058                 setpgid( (pid_t)0, (pid_t)0);
1059 #endif
1060
1061         TimeInit();
1062
1063         /* Initialise messaging system */
1064
1065         if (!message_init()) {
1066                 DEBUG(0, ("unable to initialize messaging system\n"));
1067                 exit(1);
1068         }
1069
1070         /* Initialize cache (ensure version is correct). */
1071         if (!initialize_winbindd_cache()) {
1072                 exit(1);
1073         }
1074
1075         /* React on 'smbcontrol winbindd reload-config' in the same way
1076            as to SIGHUP signal */
1077         message_register(MSG_SMB_CONF_UPDATED, msg_reload_services, NULL);
1078         message_register(MSG_SHUTDOWN, msg_shutdown, NULL);
1079
1080         /* Handle online/offline messages. */
1081         message_register(MSG_WINBIND_OFFLINE, winbind_msg_offline, NULL);
1082         message_register(MSG_WINBIND_ONLINE, winbind_msg_online, NULL);
1083         message_register(MSG_WINBIND_ONLINESTATUS, winbind_msg_onlinestatus,
1084                          NULL);
1085
1086         poptFreeContext(pc);
1087
1088         netsamlogon_cache_init(); /* Non-critical */
1089
1090         if (!init_domain_list()) {
1091                 DEBUG(0,("unable to initalize domain list\n"));
1092                 exit(1);
1093         }
1094
1095         init_idmap_child();
1096
1097         smb_nscd_flush_user_cache();
1098         smb_nscd_flush_group_cache();
1099
1100         /* Loop waiting for requests */
1101
1102         while (1)
1103                 process_loop();
1104
1105         return 0;
1106 }