source/winbindd/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 3 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, see <http://www.gnu.org/licenses/>.
  23 */
  24
  25 #include "includes.h"
  26 #include "winbindd.h"
  27
  28 #undef DBGC_CLASS
  29 #define DBGC_CLASS DBGC_WINBIND
  30
  31 bool opt_nocache = False;
  32 static bool interactive = False;
  33
  34 extern bool override_logfile;
  35
  36 struct event_context *winbind_event_context(void)
  37 {
  38         static struct event_context *ctx;
  39
  40         if (!ctx && !(ctx = event_context_init(NULL))) {
  41                 smb_panic("Could not init winbind event context");
  42         }
  43         return ctx;
  44 }
  45
  46 struct messaging_context *winbind_messaging_context(void)
  47 {
  48         static struct messaging_context *ctx;
  49
  50         if (ctx == NULL) {
  51                 ctx = messaging_init(NULL, server_id_self(),
  52                                      winbind_event_context());
  53         }
  54         if (ctx == NULL) {
  55                 DEBUG(0, ("Could not init winbind messaging context.\n"));
  56         }
  57         return ctx;
  58 }
  59
  60 /* Reload configuration */
  61
  62 static bool reload_services_file(const char *logfile)
  63 {
  64         bool ret;
  65
  66         if (lp_loaded()) {
  67                 const char *fname = lp_configfile();
  68
  69                 if (file_exist(fname,NULL) && !strcsequal(fname,get_dyn_CONFIGFILE())) {
  70                         set_dyn_CONFIGFILE(fname);
  71                 }
  72         }
  73
  74         /* if this is a child, restore the logfile to the special
  75            name - <domain>, idmap, etc. */
  76         if (logfile && *logfile) {
  77                 lp_set_logfile(logfile);
  78         }
  79
  80         reopen_logs();
  81         ret = lp_load(get_dyn_CONFIGFILE(),False,False,True,True);
  82
  83         reopen_logs();
  84         load_interfaces();
  85
  86         return(ret);
  87 }
  88
  89
  90 /**************************************************************************** **
  91  Handle a fault..
  92  **************************************************************************** */
  93
  94 static void fault_quit(void)
  95 {
  96         dump_core();
  97 }
  98
  99 static void winbindd_status(void)
 100 {
 101         struct winbindd_cli_state *tmp;
 102
 103         DEBUG(0, ("winbindd status:\n"));
 104
 105         /* Print client state information */
 106
 107         DEBUG(0, ("\t%d clients currently active\n", winbindd_num_clients()));
 108
 109         if (DEBUGLEVEL >= 2 && winbindd_num_clients()) {
 110                 DEBUG(2, ("\tclient list:\n"));
 111                 for(tmp = winbindd_client_list(); tmp; tmp = tmp->next) {
 112                         DEBUGADD(2, ("\t\tpid %lu, sock %d\n",
 113                                   (unsigned long)tmp->pid, tmp->sock));
 114                 }
 115         }
 116 }
 117
 118 /* Print winbindd status to log file */
 119
 120 static void print_winbindd_status(void)
 121 {
 122         winbindd_status();
 123 }
 124
 125 /* Flush client cache */
 126
 127 static void flush_caches(void)
 128 {
 129         /* We need to invalidate cached user list entries on a SIGHUP
 130            otherwise cached access denied errors due to restrict anonymous
 131            hang around until the sequence number changes. */
 132
 133         if (!wcache_invalidate_cache()) {
 134                 DEBUG(0, ("invalidating the cache failed; revalidate the cache\n"));
 135                 if (!winbindd_cache_validate_and_initialize()) {
 136                         exit(1);
 137                 }
 138         }
 139 }
 140
 141 /* Handle the signal by unlinking socket and exiting */
 142
 143 static void terminate(bool is_parent)
 144 {
 145         if (is_parent) {
 146                 /* When parent goes away we should
 147                  * remove the socket file. Not so
 148                  * when children terminate.
 149                  */
 150                 char *path = NULL;
 151
 152                 if (asprintf(&path, "%s/%s",
 153                         get_winbind_pipe_dir(), WINBINDD_SOCKET_NAME) > 0) {
 154                         unlink(path);
 155                         SAFE_FREE(path);
 156                 }
 157         }
 158
 159         idmap_close();
 160
 161         trustdom_cache_shutdown();
 162
 163 #if 0
 164         if (interactive) {
 165                 TALLOC_CTX *mem_ctx = talloc_init("end_description");
 166                 char *description = talloc_describe_all(mem_ctx);
 167
 168                 DEBUG(3, ("tallocs left:\n%s\n", description));
 169                 talloc_destroy(mem_ctx);
 170         }
 171 #endif
 172
 173         exit(0);
 174 }
 175
 176 static bool do_sigterm;
 177
 178 static void termination_handler(int signum)
 179 {
 180         do_sigterm = True;
 181         sys_select_signal(signum);
 182 }
 183
 184 static bool do_sigusr2;
 185
 186 static void sigusr2_handler(int signum)
 187 {
 188         do_sigusr2 = True;
 189         sys_select_signal(SIGUSR2);
 190 }
 191
 192 static bool do_sighup;
 193
 194 static void sighup_handler(int signum)
 195 {
 196         do_sighup = True;
 197         sys_select_signal(SIGHUP);
 198 }
 199
 200 static bool do_sigchld;
 201
 202 static void sigchld_handler(int signum)
 203 {
 204         do_sigchld = True;
 205         sys_select_signal(SIGCHLD);
 206 }
 207
 208 /* React on 'smbcontrol winbindd reload-config' in the same way as on SIGHUP*/
 209 static void msg_reload_services(struct messaging_context *msg,
 210                                 void *private_data,
 211                                 uint32_t msg_type,
 212                                 struct server_id server_id,
 213                                 DATA_BLOB *data)
 214 {
 215         /* Flush various caches */
 216         flush_caches();
 217         reload_services_file((const char *) private_data);
 218 }
 219
 220 /* React on 'smbcontrol winbindd shutdown' in the same way as on SIGTERM*/
 221 static void msg_shutdown(struct messaging_context *msg,
 222                          void *private_data,
 223                          uint32_t msg_type,
 224                          struct server_id server_id,
 225                          DATA_BLOB *data)
 226 {
 227         do_sigterm = True;
 228 }
 229
 230
 231 static void winbind_msg_validate_cache(struct messaging_context *msg_ctx,
 232                                        void *private_data,
 233                                        uint32_t msg_type,
 234                                        struct server_id server_id,
 235                                        DATA_BLOB *data)
 236 {
 237         uint8 ret;
 238         pid_t child_pid;
 239         struct sigaction act;
 240         struct sigaction oldact;
 241
 242         DEBUG(10, ("winbindd_msg_validate_cache: got validate-cache "
 243                    "message.\n"));
 244
 245         /*
 246          * call the validation code from a child:
 247          * so we don't block the main winbindd and the validation
 248          * code can safely use fork/waitpid...
 249          */
 250         CatchChild();
 251         child_pid = sys_fork();
 252
 253         if (child_pid == -1) {
 254                 DEBUG(1, ("winbind_msg_validate_cache: Could not fork: %s\n",
 255                           strerror(errno)));
 256                 return;
 257         }
 258
 259         if (child_pid != 0) {
 260                 /* parent */
 261                 DEBUG(5, ("winbind_msg_validate_cache: child created with "
 262                           "pid %d.\n", child_pid));
 263                 return;
 264         }
 265
 266         /* child */
 267
 268         /* install default SIGCHLD handler: validation code uses fork/waitpid */
 269         ZERO_STRUCT(act);
 270         act.sa_handler = SIG_DFL;
 271 #ifdef SA_RESTART
 272         /* We *want* SIGALRM to interrupt a system call. */
 273         act.sa_flags = SA_RESTART;
 274 #endif
 275         sigemptyset(&act.sa_mask);
 276         sigaddset(&act.sa_mask,SIGCHLD);
 277         sigaction(SIGCHLD,&act,&oldact);
 278
 279         ret = (uint8)winbindd_validate_cache_nobackup();
 280         DEBUG(10, ("winbindd_msg_validata_cache: got return value %d\n", ret));
 281         messaging_send_buf(msg_ctx, server_id, MSG_WINBIND_VALIDATE_CACHE, &ret,
 282                            (size_t)1);
 283         _exit(0);
 284 }
 285
 286 static struct winbindd_dispatch_table {
 287         enum winbindd_cmd cmd;
 288         void (*fn)(struct winbindd_cli_state *state);
 289         const char *winbindd_cmd_name;
 290 } dispatch_table[] = {
 291
 292         /* User functions */
 293
 294         { WINBINDD_GETPWNAM, winbindd_getpwnam, "GETPWNAM" },
 295         { WINBINDD_GETPWUID, winbindd_getpwuid, "GETPWUID" },
 296
 297         { WINBINDD_SETPWENT, winbindd_setpwent, "SETPWENT" },
 298         { WINBINDD_ENDPWENT, winbindd_endpwent, "ENDPWENT" },
 299         { WINBINDD_GETPWENT, winbindd_getpwent, "GETPWENT" },
 300
 301         { WINBINDD_GETGROUPS, winbindd_getgroups, "GETGROUPS" },
 302         { WINBINDD_GETUSERSIDS, winbindd_getusersids, "GETUSERSIDS" },
 303         { WINBINDD_GETUSERDOMGROUPS, winbindd_getuserdomgroups,
 304           "GETUSERDOMGROUPS" },
 305
 306         /* Group functions */
 307
 308         { WINBINDD_GETGRNAM, winbindd_getgrnam, "GETGRNAM" },
 309         { WINBINDD_GETGRGID, winbindd_getgrgid, "GETGRGID" },
 310         { WINBINDD_SETGRENT, winbindd_setgrent, "SETGRENT" },
 311         { WINBINDD_ENDGRENT, winbindd_endgrent, "ENDGRENT" },
 312         { WINBINDD_GETGRENT, winbindd_getgrent, "GETGRENT" },
 313         { WINBINDD_GETGRLST, winbindd_getgrent, "GETGRLST" },
 314
 315         /* PAM auth functions */
 316
 317         { WINBINDD_PAM_AUTH, winbindd_pam_auth, "PAM_AUTH" },
 318         { WINBINDD_PAM_AUTH_CRAP, winbindd_pam_auth_crap, "AUTH_CRAP" },
 319         { WINBINDD_PAM_CHAUTHTOK, winbindd_pam_chauthtok, "CHAUTHTOK" },
 320         { WINBINDD_PAM_LOGOFF, winbindd_pam_logoff, "PAM_LOGOFF" },
 321         { WINBINDD_PAM_CHNG_PSWD_AUTH_CRAP, winbindd_pam_chng_pswd_auth_crap, "CHNG_PSWD_AUTH_CRAP" },
 322
 323         /* Enumeration functions */
 324
 325         { WINBINDD_LIST_USERS, winbindd_list_users, "LIST_USERS" },
 326         { WINBINDD_LIST_GROUPS, winbindd_list_groups, "LIST_GROUPS" },
 327         { WINBINDD_LIST_TRUSTDOM, winbindd_list_trusted_domains,
 328           "LIST_TRUSTDOM" },
 329         { WINBINDD_SHOW_SEQUENCE, winbindd_show_sequence, "SHOW_SEQUENCE" },
 330
 331         /* SID related functions */
 332
 333         { WINBINDD_LOOKUPSID, winbindd_lookupsid, "LOOKUPSID" },
 334         { WINBINDD_LOOKUPNAME, winbindd_lookupname, "LOOKUPNAME" },
 335         { WINBINDD_LOOKUPRIDS, winbindd_lookuprids, "LOOKUPRIDS" },
 336
 337         /* Lookup related functions */
 338
 339         { WINBINDD_SID_TO_UID, winbindd_sid_to_uid, "SID_TO_UID" },
 340         { WINBINDD_SID_TO_GID, winbindd_sid_to_gid, "SID_TO_GID" },
 341         { WINBINDD_UID_TO_SID, winbindd_uid_to_sid, "UID_TO_SID" },
 342         { WINBINDD_GID_TO_SID, winbindd_gid_to_sid, "GID_TO_SID" },
 343 #if 0   /* DISABLED until we fix the interface in Samba 3.0.26 --jerry */
 344         { WINBINDD_SIDS_TO_XIDS, winbindd_sids_to_unixids, "SIDS_TO_XIDS" },
 345 #endif  /* end DISABLED */
 346         { WINBINDD_ALLOCATE_UID, winbindd_allocate_uid, "ALLOCATE_UID" },
 347         { WINBINDD_ALLOCATE_GID, winbindd_allocate_gid, "ALLOCATE_GID" },
 348         { WINBINDD_SET_MAPPING, winbindd_set_mapping, "SET_MAPPING" },
 349         { WINBINDD_SET_HWM, winbindd_set_hwm, "SET_HWMS" },
 350
 351         /* Miscellaneous */
 352
 353         { WINBINDD_CHECK_MACHACC, winbindd_check_machine_acct, "CHECK_MACHACC" },
 354         { WINBINDD_PING, winbindd_ping, "PING" },
 355         { WINBINDD_INFO, winbindd_info, "INFO" },
 356         { WINBINDD_INTERFACE_VERSION, winbindd_interface_version,
 357           "INTERFACE_VERSION" },
 358         { WINBINDD_DOMAIN_NAME, winbindd_domain_name, "DOMAIN_NAME" },
 359         { WINBINDD_DOMAIN_INFO, winbindd_domain_info, "DOMAIN_INFO" },
 360         { WINBINDD_NETBIOS_NAME, winbindd_netbios_name, "NETBIOS_NAME" },
 361         { WINBINDD_PRIV_PIPE_DIR, winbindd_priv_pipe_dir,
 362           "WINBINDD_PRIV_PIPE_DIR" },
 363         { WINBINDD_GETDCNAME, winbindd_getdcname, "GETDCNAME" },
 364         { WINBINDD_DSGETDCNAME, winbindd_dsgetdcname, "DSGETDCNAME" },
 365
 366         /* Credential cache access */
 367         { WINBINDD_CCACHE_NTLMAUTH, winbindd_ccache_ntlm_auth, "NTLMAUTH" },
 368
 369         /* WINS functions */
 370
 371         { WINBINDD_WINS_BYNAME, winbindd_wins_byname, "WINS_BYNAME" },
 372         { WINBINDD_WINS_BYIP, winbindd_wins_byip, "WINS_BYIP" },
 373
 374         /* End of list */
 375
 376         { WINBINDD_NUM_CMDS, NULL, "NONE" }
 377 };
 378
 379 static void process_request(struct winbindd_cli_state *state)
 380 {
 381         struct winbindd_dispatch_table *table = dispatch_table;
 382
 383         /* Free response data - we may be interrupted and receive another
 384            command before being able to send this data off. */
 385
 386         SAFE_FREE(state->response.extra_data.data);
 387
 388         ZERO_STRUCT(state->response);
 389
 390         state->response.result = WINBINDD_PENDING;
 391         state->response.length = sizeof(struct winbindd_response);
 392
 393         state->mem_ctx = talloc_init("winbind request");
 394         if (state->mem_ctx == NULL)
 395                 return;
 396
 397         /* Remember who asked us. */
 398         state->pid = state->request.pid;
 399
 400         /* Process command */
 401
 402         for (table = dispatch_table; table->fn; table++) {
 403                 if (state->request.cmd == table->cmd) {
 404                         DEBUG(10,("process_request: request fn %s\n",
 405                                   table->winbindd_cmd_name ));
 406                         table->fn(state);
 407                         break;
 408                 }
 409         }
 410
 411         if (!table->fn) {
 412                 DEBUG(10,("process_request: unknown request fn number %d\n",
 413                           (int)state->request.cmd ));
 414                 request_error(state);
 415         }
 416 }
 417
 418 /*
 419  * A list of file descriptors being monitored by select in the main processing
 420  * loop. fd_event->handler is called whenever the socket is readable/writable.
 421  */
 422
 423 static struct fd_event *fd_events = NULL;
 424
 425 void add_fd_event(struct fd_event *ev)
 426 {
 427         struct fd_event *match;
 428
 429         /* only add unique fd_event structs */
 430
 431         for (match=fd_events; match; match=match->next ) {
 432 #ifdef DEVELOPER
 433                 SMB_ASSERT( match != ev );
 434 #else
 435                 if ( match == ev )
 436                         return;
 437 #endif
 438         }
 439
 440         DLIST_ADD(fd_events, ev);
 441 }
 442
 443 void remove_fd_event(struct fd_event *ev)
 444 {
 445         DLIST_REMOVE(fd_events, ev);
 446 }
 447
 448 /*
 449  * Handler for fd_events to complete a read/write request, set up by
 450  * setup_async_read/setup_async_write.
 451  */
 452
 453 static void rw_callback(struct fd_event *event, int flags)
 454 {
 455         size_t todo;
 456         ssize_t done = 0;
 457
 458         todo = event->length - event->done;
 459
 460         if (event->flags & EVENT_FD_WRITE) {
 461                 SMB_ASSERT(flags == EVENT_FD_WRITE);
 462                 done = sys_write(event->fd,
 463                                  &((char *)event->data)[event->done],
 464                                  todo);
 465
 466                 if (done <= 0) {
 467                         event->flags = 0;
 468                         event->finished(event->private_data, False);
 469                         return;
 470                 }
 471         }
 472
 473         if (event->flags & EVENT_FD_READ) {
 474                 SMB_ASSERT(flags == EVENT_FD_READ);
 475                 done = sys_read(event->fd, &((char *)event->data)[event->done],
 476                                 todo);
 477
 478                 if (done <= 0) {
 479                         event->flags = 0;
 480                         event->finished(event->private_data, False);
 481                         return;
 482                 }
 483         }
 484
 485         event->done += done;
 486
 487         if (event->done == event->length) {
 488                 event->flags = 0;
 489                 event->finished(event->private_data, True);
 490         }
 491 }
 492
 493 /*
 494  * Request an async read/write on a fd_event structure. (*finished) is called
 495  * when the request is completed or an error had occurred.
 496  */
 497
 498 void setup_async_read(struct fd_event *event, void *data, size_t length,
 499                       void (*finished)(void *private_data, bool success),
 500                       void *private_data)
 501 {
 502         SMB_ASSERT(event->flags == 0);
 503         event->data = data;
 504         event->length = length;
 505         event->done = 0;
 506         event->handler = rw_callback;
 507         event->finished = finished;
 508         event->private_data = private_data;
 509         event->flags = EVENT_FD_READ;
 510 }
 511
 512 void setup_async_write(struct fd_event *event, void *data, size_t length,
 513                        void (*finished)(void *private_data, bool success),
 514                        void *private_data)
 515 {
 516         SMB_ASSERT(event->flags == 0);
 517         event->data = data;
 518         event->length = length;
 519         event->done = 0;
 520         event->handler = rw_callback;
 521         event->finished = finished;
 522         event->private_data = private_data;
 523         event->flags = EVENT_FD_WRITE;
 524 }
 525
 526 /*
 527  * This is the main event loop of winbind requests. It goes through a
 528  * state-machine of 3 read/write requests, 4 if you have extra data to send.
 529  *
 530  * An idle winbind client has a read request of 4 bytes outstanding,
 531  * finalizing function is request_len_recv, checking the length. request_recv
 532  * then processes the packet. The processing function then at some point has
 533  * to call request_finished which schedules sending the response.
 534  */
 535
 536 static void request_len_recv(void *private_data, bool success);
 537 static void request_recv(void *private_data, bool success);
 538 static void request_main_recv(void *private_data, bool success);
 539 static void request_finished(struct winbindd_cli_state *state);
 540 static void response_main_sent(void *private_data, bool success);
 541 static void response_extra_sent(void *private_data, bool success);
 542
 543 static void response_extra_sent(void *private_data, bool success)
 544 {
 545         struct winbindd_cli_state *state =
 546                 talloc_get_type_abort(private_data, struct winbindd_cli_state);
 547
 548         TALLOC_FREE(state->mem_ctx);
 549
 550         if (!success) {
 551                 state->finished = True;
 552                 return;
 553         }
 554
 555         SAFE_FREE(state->request.extra_data.data);
 556         SAFE_FREE(state->response.extra_data.data);
 557
 558         setup_async_read(&state->fd_event, &state->request, sizeof(uint32),
 559                          request_len_recv, state);
 560 }
 561
 562 static void response_main_sent(void *private_data, bool success)
 563 {
 564         struct winbindd_cli_state *state =
 565                 talloc_get_type_abort(private_data, struct winbindd_cli_state);
 566
 567         if (!success) {
 568                 state->finished = True;
 569                 return;
 570         }
 571
 572         if (state->response.length == sizeof(state->response)) {
 573                 TALLOC_FREE(state->mem_ctx);
 574
 575                 setup_async_read(&state->fd_event, &state->request,
 576                                  sizeof(uint32), request_len_recv, state);
 577                 return;
 578         }
 579
 580         setup_async_write(&state->fd_event, state->response.extra_data.data,
 581                           state->response.length - sizeof(state->response),
 582                           response_extra_sent, state);
 583 }
 584
 585 static void request_finished(struct winbindd_cli_state *state)
 586 {
 587         setup_async_write(&state->fd_event, &state->response,
 588                           sizeof(state->response), response_main_sent, state);
 589 }
 590
 591 void request_error(struct winbindd_cli_state *state)
 592 {
 593         SMB_ASSERT(state->response.result == WINBINDD_PENDING);
 594         state->response.result = WINBINDD_ERROR;
 595         request_finished(state);
 596 }
 597
 598 void request_ok(struct winbindd_cli_state *state)
 599 {
 600         SMB_ASSERT(state->response.result == WINBINDD_PENDING);
 601         state->response.result = WINBINDD_OK;
 602         request_finished(state);
 603 }
 604
 605 static void request_len_recv(void *private_data, bool success)
 606 {
 607         struct winbindd_cli_state *state =
 608                 talloc_get_type_abort(private_data, struct winbindd_cli_state);
 609
 610         if (!success) {
 611                 state->finished = True;
 612                 return;
 613         }
 614
 615         if (*(uint32 *)(&state->request) != sizeof(state->request)) {
 616                 DEBUG(0,("request_len_recv: Invalid request size received: %d (expected %u)\n",
 617                          *(uint32_t *)(&state->request), (uint32_t)sizeof(state->request)));
 618                 state->finished = True;
 619                 return;
 620         }
 621
 622         setup_async_read(&state->fd_event, (uint32 *)(&state->request)+1,
 623                          sizeof(state->request) - sizeof(uint32),
 624                          request_main_recv, state);
 625 }
 626
 627 static void request_main_recv(void *private_data, bool success)
 628 {
 629         struct winbindd_cli_state *state =
 630                 talloc_get_type_abort(private_data, struct winbindd_cli_state);
 631
 632         if (!success) {
 633                 state->finished = True;
 634                 return;
 635         }
 636
 637         if (state->request.extra_len == 0) {
 638                 state->request.extra_data.data = NULL;
 639                 request_recv(state, True);
 640                 return;
 641         }
 642
 643         if ((!state->privileged) &&
 644             (state->request.extra_len > WINBINDD_MAX_EXTRA_DATA)) {
 645                 DEBUG(3, ("Got request with %d bytes extra data on "
 646                           "unprivileged socket\n", (int)state->request.extra_len));
 647                 state->request.extra_data.data = NULL;
 648                 state->finished = True;
 649                 return;
 650         }
 651
 652         state->request.extra_data.data =
 653                 SMB_MALLOC_ARRAY(char, state->request.extra_len + 1);
 654
 655         if (state->request.extra_data.data == NULL) {
 656                 DEBUG(0, ("malloc failed\n"));
 657                 state->finished = True;
 658                 return;
 659         }
 660
 661         /* Ensure null termination */
 662         state->request.extra_data.data[state->request.extra_len] = '\0';
 663
 664         setup_async_read(&state->fd_event, state->request.extra_data.data,
 665                          state->request.extra_len, request_recv, state);
 666 }
 667
 668 static void request_recv(void *private_data, bool success)
 669 {
 670         struct winbindd_cli_state *state =
 671                 talloc_get_type_abort(private_data, struct winbindd_cli_state);
 672
 673         if (!success) {
 674                 state->finished = True;
 675                 return;
 676         }
 677
 678         process_request(state);
 679 }
 680
 681 /* Process a new connection by adding it to the client connection list */
 682
 683 static void new_connection(int listen_sock, bool privileged)
 684 {
 685         struct sockaddr_un sunaddr;
 686         struct winbindd_cli_state *state;
 687         socklen_t len;
 688         int sock;
 689
 690         /* Accept connection */
 691
 692         len = sizeof(sunaddr);
 693
 694         do {
 695                 sock = accept(listen_sock, (struct sockaddr *)&sunaddr, &len);
 696         } while (sock == -1 && errno == EINTR);
 697
 698         if (sock == -1)
 699                 return;
 700
 701         DEBUG(6,("accepted socket %d\n", sock));
 702
 703         /* Create new connection structure */
 704
 705         if ((state = TALLOC_ZERO_P(NULL, struct winbindd_cli_state)) == NULL) {
 706                 close(sock);
 707                 return;
 708         }
 709
 710         state->sock = sock;
 711
 712         state->last_access = time(NULL);
 713
 714         state->privileged = privileged;
 715
 716         state->fd_event.fd = state->sock;
 717         state->fd_event.flags = 0;
 718         add_fd_event(&state->fd_event);
 719
 720         setup_async_read(&state->fd_event, &state->request, sizeof(uint32),
 721                          request_len_recv, state);
 722
 723         /* Add to connection list */
 724
 725         winbindd_add_client(state);
 726 }
 727
 728 /* Remove a client connection from client connection list */
 729
 730 static void remove_client(struct winbindd_cli_state *state)
 731 {
 732         /* It's a dead client - hold a funeral */
 733
 734         if (state == NULL) {
 735                 return;
 736         }
 737
 738         /* Close socket */
 739
 740         close(state->sock);
 741
 742         /* Free any getent state */
 743
 744         free_getent_state(state->getpwent_state);
 745         free_getent_state(state->getgrent_state);
 746
 747         /* We may have some extra data that was not freed if the client was
 748            killed unexpectedly */
 749
 750         SAFE_FREE(state->response.extra_data.data);
 751
 752         TALLOC_FREE(state->mem_ctx);
 753
 754         remove_fd_event(&state->fd_event);
 755
 756         /* Remove from list and free */
 757
 758         winbindd_remove_client(state);
 759         TALLOC_FREE(state);
 760 }
 761
 762 /* Shutdown client connection which has been idle for the longest time */
 763
 764 static bool remove_idle_client(void)
 765 {
 766         struct winbindd_cli_state *state, *remove_state = NULL;
 767         time_t last_access = 0;
 768         int nidle = 0;
 769
 770         for (state = winbindd_client_list(); state; state = state->next) {
 771                 if (state->response.result != WINBINDD_PENDING &&
 772                     !state->getpwent_state && !state->getgrent_state) {
 773                         nidle++;
 774                         if (!last_access || state->last_access < last_access) {
 775                                 last_access = state->last_access;
 776                                 remove_state = state;
 777                         }
 778                 }
 779         }
 780
 781         if (remove_state) {
 782                 DEBUG(5,("Found %d idle client connections, shutting down sock %d, pid %u\n",
 783                         nidle, remove_state->sock, (unsigned int)remove_state->pid));
 784                 remove_client(remove_state);
 785                 return True;
 786         }
 787
 788         return False;
 789 }
 790
 791 /* check if HUP has been received and reload files */
 792 void winbind_check_sighup(const char *logfile)
 793 {
 794         if (do_sighup) {
 795
 796                 DEBUG(3, ("got SIGHUP\n"));
 797
 798                 flush_caches();
 799                 reload_services_file(logfile);
 800
 801                 do_sighup = False;
 802         }
 803 }
 804
 805 /* check if TERM has been received */
 806 void winbind_check_sigterm(bool is_parent)
 807 {
 808         if (do_sigterm)
 809                 terminate(is_parent);
 810 }
 811
 812 /* Process incoming clients on listen_sock.  We use a tricky non-blocking,
 813    non-forking, non-threaded model which allows us to handle many
 814    simultaneous connections while remaining impervious to many denial of
 815    service attacks. */
 816
 817 static void process_loop(void)
 818 {
 819         struct winbindd_cli_state *state;
 820         struct fd_event *ev;
 821         fd_set r_fds, w_fds;
 822         int maxfd, listen_sock, listen_priv_sock, selret;
 823         struct timeval timeout, ev_timeout;
 824
 825         /* Open Sockets here to get stuff going ASAP */
 826         listen_sock = open_winbindd_socket();
 827         listen_priv_sock = open_winbindd_priv_socket();
 828
 829         if (listen_sock == -1 || listen_priv_sock == -1) {
 830                 perror("open_winbind_socket");
 831                 exit(1);
 832         }
 833
 834         /* We'll be doing this a lot */
 835
 836         /* Handle messages */
 837
 838         message_dispatch(winbind_messaging_context());
 839
 840         run_events(winbind_event_context(), 0, NULL, NULL);
 841
 842         /* refresh the trusted domain cache */
 843
 844         rescan_trusted_domains();
 845
 846         /* Initialise fd lists for select() */
 847
 848         maxfd = MAX(listen_sock, listen_priv_sock);
 849
 850         FD_ZERO(&r_fds);
 851         FD_ZERO(&w_fds);
 852         FD_SET(listen_sock, &r_fds);
 853         FD_SET(listen_priv_sock, &r_fds);
 854
 855         timeout.tv_sec = WINBINDD_ESTABLISH_LOOP;
 856         timeout.tv_usec = 0;
 857
 858         /* Check for any event timeouts. */
 859         if (get_timed_events_timeout(winbind_event_context(), &ev_timeout)) {
 860                 timeout = timeval_min(&timeout, &ev_timeout);
 861         }
 862
 863         /* Set up client readers and writers */
 864
 865         state = winbindd_client_list();
 866
 867         while (state) {
 868
 869                 struct winbindd_cli_state *next = state->next;
 870
 871                 /* Dispose of client connection if it is marked as
 872                    finished */
 873
 874                 if (state->finished)
 875                         remove_client(state);
 876
 877                 state = next;
 878         }
 879
 880         for (ev = fd_events; ev; ev = ev->next) {
 881                 if (ev->flags & EVENT_FD_READ) {
 882                         FD_SET(ev->fd, &r_fds);
 883                         maxfd = MAX(ev->fd, maxfd);
 884                 }
 885                 if (ev->flags & EVENT_FD_WRITE) {
 886                         FD_SET(ev->fd, &w_fds);
 887                         maxfd = MAX(ev->fd, maxfd);
 888                 }
 889         }
 890
 891         /* Call select */
 892
 893         selret = sys_select(maxfd + 1, &r_fds, &w_fds, NULL, &timeout);
 894
 895         if (selret == 0) {
 896                 goto no_fds_ready;
 897         }
 898
 899         if (selret == -1) {
 900                 if (errno == EINTR) {
 901                         goto no_fds_ready;
 902                 }
 903
 904                 /* Select error, something is badly wrong */
 905
 906                 perror("select");
 907                 exit(1);
 908         }
 909
 910         /* selret > 0 */
 911
 912         ev = fd_events;
 913         while (ev != NULL) {
 914                 struct fd_event *next = ev->next;
 915                 int flags = 0;
 916                 if (FD_ISSET(ev->fd, &r_fds))
 917                         flags |= EVENT_FD_READ;
 918                 if (FD_ISSET(ev->fd, &w_fds))
 919                         flags |= EVENT_FD_WRITE;
 920                 if (flags)
 921                         ev->handler(ev, flags);
 922                 ev = next;
 923         }
 924
 925         if (FD_ISSET(listen_sock, &r_fds)) {
 926                 while (winbindd_num_clients() >
 927                        WINBINDD_MAX_SIMULTANEOUS_CLIENTS - 1) {
 928                         DEBUG(5,("winbindd: Exceeding %d client "
 929                                  "connections, removing idle "
 930                                  "connection.\n",
 931                                  WINBINDD_MAX_SIMULTANEOUS_CLIENTS));
 932                         if (!remove_idle_client()) {
 933                                 DEBUG(0,("winbindd: Exceeding %d "
 934                                          "client connections, no idle "
 935                                          "connection found\n",
 936                                          WINBINDD_MAX_SIMULTANEOUS_CLIENTS));
 937                                 break;
 938                         }
 939                 }
 940                 /* new, non-privileged connection */
 941                 new_connection(listen_sock, False);
 942         }
 943
 944         if (FD_ISSET(listen_priv_sock, &r_fds)) {
 945                 while (winbindd_num_clients() >
 946                        WINBINDD_MAX_SIMULTANEOUS_CLIENTS - 1) {
 947                         DEBUG(5,("winbindd: Exceeding %d client "
 948                                  "connections, removing idle "
 949                                  "connection.\n",
 950                                  WINBINDD_MAX_SIMULTANEOUS_CLIENTS));
 951                         if (!remove_idle_client()) {
 952                                 DEBUG(0,("winbindd: Exceeding %d "
 953                                          "client connections, no idle "
 954                                          "connection found\n",
 955                                          WINBINDD_MAX_SIMULTANEOUS_CLIENTS));
 956                                 break;
 957                         }
 958                 }
 959                 /* new, privileged connection */
 960                 new_connection(listen_priv_sock, True);
 961         }
 962
 963  no_fds_ready:
 964
 965 #if 0
 966         winbindd_check_cache_size(time(NULL));
 967 #endif
 968
 969         /* Check signal handling things */
 970
 971         winbind_check_sigterm(true);
 972         winbind_check_sighup(NULL);
 973
 974         if (do_sigusr2) {
 975                 print_winbindd_status();
 976                 do_sigusr2 = False;
 977         }
 978
 979         if (do_sigchld) {
 980                 pid_t pid;
 981
 982                 do_sigchld = False;
 983
 984                 while ((pid = sys_waitpid(-1, NULL, WNOHANG)) > 0) {
 985                         winbind_child_died(pid);
 986                 }
 987         }
 988 }
 989
 990 /* Main function */
 991
 992 int main(int argc, char **argv, char **envp)
 993 {
 994         static bool is_daemon = False;
 995         static bool Fork = True;
 996         static bool log_stdout = False;
 997         static bool no_process_group = False;
 998         enum {
 999                 OPT_DAEMON = 1000,
1000                 OPT_FORK,
1001                 OPT_NO_PROCESS_GROUP,
1002                 OPT_LOG_STDOUT
1003         };
1004         struct poptOption long_options[] = {
1005                 POPT_AUTOHELP
1006                 { "stdout", 'S', POPT_ARG_NONE, NULL, OPT_LOG_STDOUT, "Log to stdout" },
1007                 { "foreground", 'F', POPT_ARG_NONE, NULL, OPT_FORK, "Daemon in foreground mode" },
1008                 { "no-process-group", 0, POPT_ARG_NONE, NULL, OPT_NO_PROCESS_GROUP, "Don't create a new process group" },
1009                 { "daemon", 'D', POPT_ARG_NONE, NULL, OPT_DAEMON, "Become a daemon (default)" },
1010                 { "interactive", 'i', POPT_ARG_NONE, NULL, 'i', "Interactive mode" },
1011                 { "no-caching", 'n', POPT_ARG_NONE, NULL, 'n', "Disable caching" },
1012                 POPT_COMMON_SAMBA
1013                 POPT_TABLEEND
1014         };
1015         poptContext pc;
1016         int opt;
1017         TALLOC_CTX *frame = talloc_stackframe();
1018
1019         /* glibc (?) likes to print "User defined signal 1" and exit if a
1020            SIGUSR[12] is received before a handler is installed */
1021
1022         CatchSignal(SIGUSR1, SIG_IGN);
1023         CatchSignal(SIGUSR2, SIG_IGN);
1024
1025         fault_setup((void (*)(void *))fault_quit );
1026         dump_core_setup("winbindd");
1027
1028         load_case_tables();
1029
1030         db_tdb2_setup_messaging(NULL, false);
1031
1032         /* Initialise for running in non-root mode */
1033
1034         sec_init();
1035
1036         set_remote_machine_name("winbindd", False);
1037
1038         /* Set environment variable so we don't recursively call ourselves.
1039            This may also be useful interactively. */
1040
1041         if ( !winbind_off() ) {
1042                 DEBUG(0,("Failed to disable recusive winbindd calls.  Exiting.\n"));
1043                 exit(1);
1044         }
1045
1046         /* Initialise samba/rpc client stuff */
1047
1048         pc = poptGetContext("winbindd", argc, (const char **)argv, long_options, 0);
1049
1050         while ((opt = poptGetNextOpt(pc)) != -1) {
1051                 switch (opt) {
1052                         /* Don't become a daemon */
1053                 case OPT_DAEMON:
1054                         is_daemon = True;
1055                         break;
1056                 case 'i':
1057                         interactive = True;
1058                         log_stdout = True;
1059                         Fork = False;
1060                         break;
1061                 case OPT_FORK:
1062                         Fork = false;
1063                         break;
1064                 case OPT_NO_PROCESS_GROUP:
1065                         no_process_group = true;
1066                         break;
1067                 case OPT_LOG_STDOUT:
1068                         log_stdout = true;
1069                         break;
1070                 case 'n':
1071                         opt_nocache = true;
1072                         break;
1073                 default:
1074                         d_fprintf(stderr, "\nInvalid option %s: %s\n\n",
1075                                   poptBadOption(pc, 0), poptStrerror(opt));
1076                         poptPrintUsage(pc, stderr, 0);
1077                         exit(1);
1078                 }
1079         }
1080
1081         if (is_daemon && interactive) {
1082                 d_fprintf(stderr,"\nERROR: "
1083                           "Option -i|--interactive is not allowed together with -D|--daemon\n\n");
1084                 poptPrintUsage(pc, stderr, 0);
1085                 exit(1);
1086         }
1087
1088         if (log_stdout && Fork) {
1089                 d_fprintf(stderr, "\nERROR: "
1090                           "Can't log to stdout (-S) unless daemon is in foreground +(-F) or interactive (-i)\n\n");
1091                 poptPrintUsage(pc, stderr, 0);
1092                 exit(1);
1093         }
1094
1095         poptFreeContext(pc);
1096
1097         if (!override_logfile) {
1098                 char *logfile = NULL;
1099                 if (asprintf(&logfile,"%s/log.winbindd",
1100                                 get_dyn_LOGFILEBASE()) > 0) {
1101                         lp_set_logfile(logfile);
1102                         SAFE_FREE(logfile);
1103                 }
1104         }
1105         setup_logging("winbindd", log_stdout);
1106         reopen_logs();
1107
1108         DEBUG(0,("winbindd version %s started.\n", SAMBA_VERSION_STRING));
1109         DEBUGADD(0,("%s\n", COPYRIGHT_STARTUP_MESSAGE));
1110
1111         if (!lp_load_initial_only(get_dyn_CONFIGFILE())) {
1112                 DEBUG(0, ("error opening config file\n"));
1113                 exit(1);
1114         }
1115
1116         /* Initialise messaging system */
1117
1118         if (winbind_messaging_context() == NULL) {
1119                 exit(1);
1120         }
1121
1122         db_tdb2_setup_messaging(winbind_messaging_context(), true);
1123
1124         if (!reload_services_file(NULL)) {
1125                 DEBUG(0, ("error opening config file\n"));
1126                 exit(1);
1127         }
1128
1129         if (!directory_exist(lp_lockdir(), NULL)) {
1130                 mkdir(lp_lockdir(), 0755);
1131         }
1132
1133         /* Setup names. */
1134
1135         if (!init_names())
1136                 exit(1);
1137
1138         load_interfaces();
1139
1140         if (!secrets_init()) {
1141
1142                 DEBUG(0,("Could not initialize domain trust account secrets. Giving up\n"));
1143                 return False;
1144         }
1145
1146         /* Enable netbios namecache */
1147
1148         namecache_enable();
1149
1150         /* Winbind daemon initialisation */
1151
1152         if ( ! NT_STATUS_IS_OK(idmap_init_cache()) ) {
1153                 DEBUG(1, ("Could not init idmap cache!\n"));
1154         }
1155
1156         /* Unblock all signals we are interested in as they may have been
1157            blocked by the parent process. */
1158
1159         BlockSignals(False, SIGINT);
1160         BlockSignals(False, SIGQUIT);
1161         BlockSignals(False, SIGTERM);
1162         BlockSignals(False, SIGUSR1);
1163         BlockSignals(False, SIGUSR2);
1164         BlockSignals(False, SIGHUP);
1165         BlockSignals(False, SIGCHLD);
1166
1167         /* Setup signal handlers */
1168
1169         CatchSignal(SIGINT, termination_handler);      /* Exit on these sigs */
1170         CatchSignal(SIGQUIT, termination_handler);
1171         CatchSignal(SIGTERM, termination_handler);
1172         CatchSignal(SIGCHLD, sigchld_handler);
1173
1174         CatchSignal(SIGPIPE, SIG_IGN);                 /* Ignore sigpipe */
1175
1176         CatchSignal(SIGUSR2, sigusr2_handler);         /* Debugging sigs */
1177         CatchSignal(SIGHUP, sighup_handler);
1178
1179         if (!interactive)
1180                 become_daemon(Fork, no_process_group);
1181
1182         pidfile_create("winbindd");
1183
1184 #if HAVE_SETPGID
1185         /*
1186          * If we're interactive we want to set our own process group for
1187          * signal management.
1188          */
1189         if (interactive && !no_process_group)
1190                 setpgid( (pid_t)0, (pid_t)0);
1191 #endif
1192
1193         TimeInit();
1194
1195         if (!reinit_after_fork(winbind_messaging_context(), false)) {
1196                 DEBUG(0,("reinit_after_fork() failed\n"));
1197                 exit(1);
1198         }
1199
1200         /*
1201          * Ensure all cache and idmap caches are consistent
1202          * and initialized before we startup.
1203          */
1204         if (!winbindd_cache_validate_and_initialize()) {
1205                 exit(1);
1206         }
1207
1208         /* get broadcast messages */
1209         claim_connection(NULL,"",FLAG_MSG_GENERAL|FLAG_MSG_DBWRAP);
1210
1211         /* React on 'smbcontrol winbindd reload-config' in the same way
1212            as to SIGHUP signal */
1213         messaging_register(winbind_messaging_context(), NULL,
1214                            MSG_SMB_CONF_UPDATED, msg_reload_services);
1215         messaging_register(winbind_messaging_context(), NULL,
1216                            MSG_SHUTDOWN, msg_shutdown);
1217
1218         /* Handle online/offline messages. */
1219         messaging_register(winbind_messaging_context(), NULL,
1220                            MSG_WINBIND_OFFLINE, winbind_msg_offline);
1221         messaging_register(winbind_messaging_context(), NULL,
1222                            MSG_WINBIND_ONLINE, winbind_msg_online);
1223         messaging_register(winbind_messaging_context(), NULL,
1224                            MSG_WINBIND_ONLINESTATUS, winbind_msg_onlinestatus);
1225
1226         messaging_register(winbind_messaging_context(), NULL,
1227                            MSG_DUMP_EVENT_LIST, winbind_msg_dump_event_list);
1228
1229         messaging_register(winbind_messaging_context(), NULL,
1230                            MSG_WINBIND_VALIDATE_CACHE,
1231                            winbind_msg_validate_cache);
1232
1233         messaging_register(winbind_messaging_context(), NULL,
1234                            MSG_WINBIND_DUMP_DOMAIN_LIST,
1235                            winbind_msg_dump_domain_list);
1236
1237         /* Register handler for MSG_DEBUG. */
1238         messaging_register(winbind_messaging_context(), NULL,
1239                            MSG_DEBUG,
1240                            winbind_msg_debug);
1241
1242         netsamlogon_cache_init(); /* Non-critical */
1243
1244         /* clear the cached list of trusted domains */
1245
1246         wcache_tdc_clear();
1247
1248         if (!init_domain_list()) {
1249                 DEBUG(0,("unable to initialize domain list\n"));
1250                 exit(1);
1251         }
1252
1253         init_idmap_child();
1254         init_locator_child();
1255
1256         smb_nscd_flush_user_cache();
1257         smb_nscd_flush_group_cache();
1258
1259         /* Loop waiting for requests */
1260
1261         TALLOC_FREE(frame);
1262         while (1) {
1263                 frame = talloc_stackframe();
1264                 process_loop();
1265                 TALLOC_FREE(frame);
1266         }
1267
1268         return 0;
1269 }