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 && !(ctx = messaging_init(NULL, server_id_self(),
  51                                            winbind_event_context()))) {
  52                 smb_panic("Could not init winbind messaging context");
  53         }
  54         return ctx;
  55 }
  56
  57 /* Reload configuration */
  58
  59 static bool reload_services_file(void)
  60 {
  61         bool ret;
  62
  63         if (lp_loaded()) {
  64                 const char *fname = lp_configfile();
  65
  66                 if (file_exist(fname,NULL) && !strcsequal(fname,get_dyn_CONFIGFILE())) {
  67                         set_dyn_CONFIGFILE(fname);
  68                 }
  69         }
  70
  71         reopen_logs();
  72         ret = lp_load(get_dyn_CONFIGFILE(),False,False,True,True);
  73
  74         reopen_logs();
  75         load_interfaces();
  76
  77         return(ret);
  78 }
  79
  80
  81 /**************************************************************************** **
  82  Handle a fault..
  83  **************************************************************************** */
  84
  85 static void fault_quit(void)
  86 {
  87         dump_core();
  88 }
  89
  90 static void winbindd_status(void)
  91 {
  92         struct winbindd_cli_state *tmp;
  93
  94         DEBUG(0, ("winbindd status:\n"));
  95
  96         /* Print client state information */
  97
  98         DEBUG(0, ("\t%d clients currently active\n", winbindd_num_clients()));
  99
 100         if (DEBUGLEVEL >= 2 && winbindd_num_clients()) {
 101                 DEBUG(2, ("\tclient list:\n"));
 102                 for(tmp = winbindd_client_list(); tmp; tmp = tmp->next) {
 103                         DEBUGADD(2, ("\t\tpid %lu, sock %d\n",
 104                                   (unsigned long)tmp->pid, tmp->sock));
 105                 }
 106         }
 107 }
 108
 109 /* Print winbindd status to log file */
 110
 111 static void print_winbindd_status(void)
 112 {
 113         winbindd_status();
 114 }
 115
 116 /* Flush client cache */
 117
 118 static void flush_caches(void)
 119 {
 120         /* We need to invalidate cached user list entries on a SIGHUP
 121            otherwise cached access denied errors due to restrict anonymous
 122            hang around until the sequence number changes. */
 123
 124         if (!wcache_invalidate_cache()) {
 125                 DEBUG(0, ("invalidating the cache failed; revalidate the cache\n"));
 126                 if (!winbindd_cache_validate_and_initialize()) {
 127                         exit(1);
 128                 }
 129         }
 130 }
 131
 132 /* Handle the signal by unlinking socket and exiting */
 133
 134 static void terminate(bool is_parent)
 135 {
 136         if (is_parent) {
 137                 /* When parent goes away we should
 138                  * remove the socket file. Not so
 139                  * when children terminate.
 140                  */
 141                 char *path = NULL;
 142
 143                 if (asprintf(&path, "%s/%s",
 144                         get_winbind_pipe_dir(), WINBINDD_SOCKET_NAME) > 0) {
 145                         unlink(path);
 146                         SAFE_FREE(path);
 147                 }
 148         }
 149
 150         idmap_close();
 151
 152         trustdom_cache_shutdown();
 153
 154 #if 0
 155         if (interactive) {
 156                 TALLOC_CTX *mem_ctx = talloc_init("end_description");
 157                 char *description = talloc_describe_all(mem_ctx);
 158
 159                 DEBUG(3, ("tallocs left:\n%s\n", description));
 160                 talloc_destroy(mem_ctx);
 161         }
 162 #endif
 163
 164         exit(0);
 165 }
 166
 167 static bool do_sigterm;
 168
 169 static void termination_handler(int signum)
 170 {
 171         do_sigterm = True;
 172         sys_select_signal(signum);
 173 }
 174
 175 static bool do_sigusr2;
 176
 177 static void sigusr2_handler(int signum)
 178 {
 179         do_sigusr2 = True;
 180         sys_select_signal(SIGUSR2);
 181 }
 182
 183 static bool do_sighup;
 184
 185 static void sighup_handler(int signum)
 186 {
 187         do_sighup = True;
 188         sys_select_signal(SIGHUP);
 189 }
 190
 191 static bool do_sigchld;
 192
 193 static void sigchld_handler(int signum)
 194 {
 195         do_sigchld = True;
 196         sys_select_signal(SIGCHLD);
 197 }
 198
 199 /* React on 'smbcontrol winbindd reload-config' in the same way as on SIGHUP*/
 200 static void msg_reload_services(struct messaging_context *msg,
 201                                 void *private_data,
 202                                 uint32_t msg_type,
 203                                 struct server_id server_id,
 204                                 DATA_BLOB *data)
 205 {
 206         /* Flush various caches */
 207         flush_caches();
 208         reload_services_file();
 209 }
 210
 211 /* React on 'smbcontrol winbindd shutdown' in the same way as on SIGTERM*/
 212 static void msg_shutdown(struct messaging_context *msg,
 213                          void *private_data,
 214                          uint32_t msg_type,
 215                          struct server_id server_id,
 216                          DATA_BLOB *data)
 217 {
 218         do_sigterm = True;
 219 }
 220
 221
 222 static void winbind_msg_validate_cache(struct messaging_context *msg_ctx,
 223                                        void *private_data,
 224                                        uint32_t msg_type,
 225                                        struct server_id server_id,
 226                                        DATA_BLOB *data)
 227 {
 228         uint8 ret;
 229         pid_t child_pid;
 230         struct sigaction act;
 231         struct sigaction oldact;
 232
 233         DEBUG(10, ("winbindd_msg_validate_cache: got validate-cache "
 234                    "message.\n"));
 235
 236         /*
 237          * call the validation code from a child:
 238          * so we don't block the main winbindd and the validation
 239          * code can safely use fork/waitpid...
 240          */
 241         CatchChild();
 242         child_pid = sys_fork();
 243
 244         if (child_pid == -1) {
 245                 DEBUG(1, ("winbind_msg_validate_cache: Could not fork: %s\n",
 246                           strerror(errno)));
 247                 return;
 248         }
 249
 250         if (child_pid != 0) {
 251                 /* parent */
 252                 DEBUG(5, ("winbind_msg_validate_cache: child created with "
 253                           "pid %d.\n", child_pid));
 254                 return;
 255         }
 256
 257         /* child */
 258
 259         /* install default SIGCHLD handler: validation code uses fork/waitpid */
 260         ZERO_STRUCT(act);
 261         act.sa_handler = SIG_DFL;
 262 #ifdef SA_RESTART
 263         /* We *want* SIGALRM to interrupt a system call. */
 264         act.sa_flags = SA_RESTART;
 265 #endif
 266         sigemptyset(&act.sa_mask);
 267         sigaddset(&act.sa_mask,SIGCHLD);
 268         sigaction(SIGCHLD,&act,&oldact);
 269
 270         ret = (uint8)winbindd_validate_cache_nobackup();
 271         DEBUG(10, ("winbindd_msg_validata_cache: got return value %d\n", ret));
 272         messaging_send_buf(msg_ctx, server_id, MSG_WINBIND_VALIDATE_CACHE, &ret,
 273                            (size_t)1);
 274         _exit(0);
 275 }
 276
 277 static struct winbindd_dispatch_table {
 278         enum winbindd_cmd cmd;
 279         void (*fn)(struct winbindd_cli_state *state);
 280         const char *winbindd_cmd_name;
 281 } dispatch_table[] = {
 282
 283         /* User functions */
 284
 285         { WINBINDD_GETPWNAM, winbindd_getpwnam, "GETPWNAM" },
 286         { WINBINDD_GETPWUID, winbindd_getpwuid, "GETPWUID" },
 287
 288         { WINBINDD_SETPWENT, winbindd_setpwent, "SETPWENT" },
 289         { WINBINDD_ENDPWENT, winbindd_endpwent, "ENDPWENT" },
 290         { WINBINDD_GETPWENT, winbindd_getpwent, "GETPWENT" },
 291
 292         { WINBINDD_GETGROUPS, winbindd_getgroups, "GETGROUPS" },
 293         { WINBINDD_GETUSERSIDS, winbindd_getusersids, "GETUSERSIDS" },
 294         { WINBINDD_GETUSERDOMGROUPS, winbindd_getuserdomgroups,
 295           "GETUSERDOMGROUPS" },
 296
 297         /* Group functions */
 298
 299         { WINBINDD_GETGRNAM, winbindd_getgrnam, "GETGRNAM" },
 300         { WINBINDD_GETGRGID, winbindd_getgrgid, "GETGRGID" },
 301         { WINBINDD_SETGRENT, winbindd_setgrent, "SETGRENT" },
 302         { WINBINDD_ENDGRENT, winbindd_endgrent, "ENDGRENT" },
 303         { WINBINDD_GETGRENT, winbindd_getgrent, "GETGRENT" },
 304         { WINBINDD_GETGRLST, winbindd_getgrent, "GETGRLST" },
 305
 306         /* PAM auth functions */
 307
 308         { WINBINDD_PAM_AUTH, winbindd_pam_auth, "PAM_AUTH" },
 309         { WINBINDD_PAM_AUTH_CRAP, winbindd_pam_auth_crap, "AUTH_CRAP" },
 310         { WINBINDD_PAM_CHAUTHTOK, winbindd_pam_chauthtok, "CHAUTHTOK" },
 311         { WINBINDD_PAM_LOGOFF, winbindd_pam_logoff, "PAM_LOGOFF" },
 312         { WINBINDD_PAM_CHNG_PSWD_AUTH_CRAP, winbindd_pam_chng_pswd_auth_crap, "CHNG_PSWD_AUTH_CRAP" },
 313
 314         /* Enumeration functions */
 315
 316         { WINBINDD_LIST_USERS, winbindd_list_users, "LIST_USERS" },
 317         { WINBINDD_LIST_GROUPS, winbindd_list_groups, "LIST_GROUPS" },
 318         { WINBINDD_LIST_TRUSTDOM, winbindd_list_trusted_domains,
 319           "LIST_TRUSTDOM" },
 320         { WINBINDD_SHOW_SEQUENCE, winbindd_show_sequence, "SHOW_SEQUENCE" },
 321
 322         /* SID related functions */
 323
 324         { WINBINDD_LOOKUPSID, winbindd_lookupsid, "LOOKUPSID" },
 325         { WINBINDD_LOOKUPNAME, winbindd_lookupname, "LOOKUPNAME" },
 326         { WINBINDD_LOOKUPRIDS, winbindd_lookuprids, "LOOKUPRIDS" },
 327
 328         /* Lookup related functions */
 329
 330         { WINBINDD_SID_TO_UID, winbindd_sid_to_uid, "SID_TO_UID" },
 331         { WINBINDD_SID_TO_GID, winbindd_sid_to_gid, "SID_TO_GID" },
 332         { WINBINDD_UID_TO_SID, winbindd_uid_to_sid, "UID_TO_SID" },
 333         { WINBINDD_GID_TO_SID, winbindd_gid_to_sid, "GID_TO_SID" },
 334 #if 0   /* DISABLED until we fix the interface in Samba 3.0.26 --jerry */
 335         { WINBINDD_SIDS_TO_XIDS, winbindd_sids_to_unixids, "SIDS_TO_XIDS" },
 336 #endif  /* end DISABLED */
 337         { WINBINDD_ALLOCATE_UID, winbindd_allocate_uid, "ALLOCATE_UID" },
 338         { WINBINDD_ALLOCATE_GID, winbindd_allocate_gid, "ALLOCATE_GID" },
 339         { WINBINDD_SET_MAPPING, winbindd_set_mapping, "SET_MAPPING" },
 340         { WINBINDD_SET_HWM, winbindd_set_hwm, "SET_HWMS" },
 341
 342         /* Miscellaneous */
 343
 344         { WINBINDD_CHECK_MACHACC, winbindd_check_machine_acct, "CHECK_MACHACC" },
 345         { WINBINDD_PING, winbindd_ping, "PING" },
 346         { WINBINDD_INFO, winbindd_info, "INFO" },
 347         { WINBINDD_INTERFACE_VERSION, winbindd_interface_version,
 348           "INTERFACE_VERSION" },
 349         { WINBINDD_DOMAIN_NAME, winbindd_domain_name, "DOMAIN_NAME" },
 350         { WINBINDD_DOMAIN_INFO, winbindd_domain_info, "DOMAIN_INFO" },
 351         { WINBINDD_NETBIOS_NAME, winbindd_netbios_name, "NETBIOS_NAME" },
 352         { WINBINDD_PRIV_PIPE_DIR, winbindd_priv_pipe_dir,
 353           "WINBINDD_PRIV_PIPE_DIR" },
 354         { WINBINDD_GETDCNAME, winbindd_getdcname, "GETDCNAME" },
 355         { WINBINDD_DSGETDCNAME, winbindd_dsgetdcname, "DSGETDCNAME" },
 356
 357         /* Credential cache access */
 358         { WINBINDD_CCACHE_NTLMAUTH, winbindd_ccache_ntlm_auth, "NTLMAUTH" },
 359
 360         /* WINS functions */
 361
 362         { WINBINDD_WINS_BYNAME, winbindd_wins_byname, "WINS_BYNAME" },
 363         { WINBINDD_WINS_BYIP, winbindd_wins_byip, "WINS_BYIP" },
 364
 365         /* End of list */
 366
 367         { WINBINDD_NUM_CMDS, NULL, "NONE" }
 368 };
 369
 370 static void process_request(struct winbindd_cli_state *state)
 371 {
 372         struct winbindd_dispatch_table *table = dispatch_table;
 373
 374         /* Free response data - we may be interrupted and receive another
 375            command before being able to send this data off. */
 376
 377         SAFE_FREE(state->response.extra_data.data);
 378
 379         ZERO_STRUCT(state->response);
 380
 381         state->response.result = WINBINDD_PENDING;
 382         state->response.length = sizeof(struct winbindd_response);
 383
 384         state->mem_ctx = talloc_init("winbind request");
 385         if (state->mem_ctx == NULL)
 386                 return;
 387
 388         /* Remember who asked us. */
 389         state->pid = state->request.pid;
 390
 391         /* Process command */
 392
 393         for (table = dispatch_table; table->fn; table++) {
 394                 if (state->request.cmd == table->cmd) {
 395                         DEBUG(10,("process_request: request fn %s\n",
 396                                   table->winbindd_cmd_name ));
 397                         table->fn(state);
 398                         break;
 399                 }
 400         }
 401
 402         if (!table->fn) {
 403                 DEBUG(10,("process_request: unknown request fn number %d\n",
 404                           (int)state->request.cmd ));
 405                 request_error(state);
 406         }
 407 }
 408
 409 /*
 410  * A list of file descriptors being monitored by select in the main processing
 411  * loop. fd_event->handler is called whenever the socket is readable/writable.
 412  */
 413
 414 static struct fd_event *fd_events = NULL;
 415
 416 void add_fd_event(struct fd_event *ev)
 417 {
 418         struct fd_event *match;
 419
 420         /* only add unique fd_event structs */
 421
 422         for (match=fd_events; match; match=match->next ) {
 423 #ifdef DEVELOPER
 424                 SMB_ASSERT( match != ev );
 425 #else
 426                 if ( match == ev )
 427                         return;
 428 #endif
 429         }
 430
 431         DLIST_ADD(fd_events, ev);
 432 }
 433
 434 void remove_fd_event(struct fd_event *ev)
 435 {
 436         DLIST_REMOVE(fd_events, ev);
 437 }
 438
 439 /*
 440  * Handler for fd_events to complete a read/write request, set up by
 441  * setup_async_read/setup_async_write.
 442  */
 443
 444 static void rw_callback(struct fd_event *event, int flags)
 445 {
 446         size_t todo;
 447         ssize_t done = 0;
 448
 449         todo = event->length - event->done;
 450
 451         if (event->flags & EVENT_FD_WRITE) {
 452                 SMB_ASSERT(flags == EVENT_FD_WRITE);
 453                 done = sys_write(event->fd,
 454                                  &((char *)event->data)[event->done],
 455                                  todo);
 456
 457                 if (done <= 0) {
 458                         event->flags = 0;
 459                         event->finished(event->private_data, False);
 460                         return;
 461                 }
 462         }
 463
 464         if (event->flags & EVENT_FD_READ) {
 465                 SMB_ASSERT(flags == EVENT_FD_READ);
 466                 done = sys_read(event->fd, &((char *)event->data)[event->done],
 467                                 todo);
 468
 469                 if (done <= 0) {
 470                         event->flags = 0;
 471                         event->finished(event->private_data, False);
 472                         return;
 473                 }
 474         }
 475
 476         event->done += done;
 477
 478         if (event->done == event->length) {
 479                 event->flags = 0;
 480                 event->finished(event->private_data, True);
 481         }
 482 }
 483
 484 /*
 485  * Request an async read/write on a fd_event structure. (*finished) is called
 486  * when the request is completed or an error had occurred.
 487  */
 488
 489 void setup_async_read(struct fd_event *event, void *data, size_t length,
 490                       void (*finished)(void *private_data, bool success),
 491                       void *private_data)
 492 {
 493         SMB_ASSERT(event->flags == 0);
 494         event->data = data;
 495         event->length = length;
 496         event->done = 0;
 497         event->handler = rw_callback;
 498         event->finished = finished;
 499         event->private_data = private_data;
 500         event->flags = EVENT_FD_READ;
 501 }
 502
 503 void setup_async_write(struct fd_event *event, void *data, size_t length,
 504                        void (*finished)(void *private_data, bool success),
 505                        void *private_data)
 506 {
 507         SMB_ASSERT(event->flags == 0);
 508         event->data = data;
 509         event->length = length;
 510         event->done = 0;
 511         event->handler = rw_callback;
 512         event->finished = finished;
 513         event->private_data = private_data;
 514         event->flags = EVENT_FD_WRITE;
 515 }
 516
 517 /*
 518  * This is the main event loop of winbind requests. It goes through a
 519  * state-machine of 3 read/write requests, 4 if you have extra data to send.
 520  *
 521  * An idle winbind client has a read request of 4 bytes outstanding,
 522  * finalizing function is request_len_recv, checking the length. request_recv
 523  * then processes the packet. The processing function then at some point has
 524  * to call request_finished which schedules sending the response.
 525  */
 526
 527 static void request_len_recv(void *private_data, bool success);
 528 static void request_recv(void *private_data, bool success);
 529 static void request_main_recv(void *private_data, bool success);
 530 static void request_finished(struct winbindd_cli_state *state);
 531 void request_finished_cont(void *private_data, bool success);
 532 static void response_main_sent(void *private_data, bool success);
 533 static void response_extra_sent(void *private_data, bool success);
 534
 535 static void response_extra_sent(void *private_data, bool success)
 536 {
 537         struct winbindd_cli_state *state =
 538                 talloc_get_type_abort(private_data, struct winbindd_cli_state);
 539
 540         if (state->mem_ctx != NULL) {
 541                 talloc_destroy(state->mem_ctx);
 542                 state->mem_ctx = NULL;
 543         }
 544
 545         if (!success) {
 546                 state->finished = True;
 547                 return;
 548         }
 549
 550         SAFE_FREE(state->request.extra_data.data);
 551         SAFE_FREE(state->response.extra_data.data);
 552
 553         setup_async_read(&state->fd_event, &state->request, sizeof(uint32),
 554                          request_len_recv, state);
 555 }
 556
 557 static void response_main_sent(void *private_data, bool success)
 558 {
 559         struct winbindd_cli_state *state =
 560                 talloc_get_type_abort(private_data, struct winbindd_cli_state);
 561
 562         if (!success) {
 563                 state->finished = True;
 564                 return;
 565         }
 566
 567         if (state->response.length == sizeof(state->response)) {
 568                 if (state->mem_ctx != NULL) {
 569                         talloc_destroy(state->mem_ctx);
 570                         state->mem_ctx = NULL;
 571                 }
 572
 573                 setup_async_read(&state->fd_event, &state->request,
 574                                  sizeof(uint32), request_len_recv, state);
 575                 return;
 576         }
 577
 578         setup_async_write(&state->fd_event, state->response.extra_data.data,
 579                           state->response.length - sizeof(state->response),
 580                           response_extra_sent, state);
 581 }
 582
 583 static void request_finished(struct winbindd_cli_state *state)
 584 {
 585         setup_async_write(&state->fd_event, &state->response,
 586                           sizeof(state->response), response_main_sent, state);
 587 }
 588
 589 void request_error(struct winbindd_cli_state *state)
 590 {
 591         SMB_ASSERT(state->response.result == WINBINDD_PENDING);
 592         state->response.result = WINBINDD_ERROR;
 593         request_finished(state);
 594 }
 595
 596 void request_ok(struct winbindd_cli_state *state)
 597 {
 598         SMB_ASSERT(state->response.result == WINBINDD_PENDING);
 599         state->response.result = WINBINDD_OK;
 600         request_finished(state);
 601 }
 602
 603 void request_finished_cont(void *private_data, bool success)
 604 {
 605         struct winbindd_cli_state *state =
 606                 talloc_get_type_abort(private_data, struct winbindd_cli_state);
 607
 608         if (success)
 609                 request_ok(state);
 610         else
 611                 request_error(state);
 612 }
 613
 614 static void request_len_recv(void *private_data, bool success)
 615 {
 616         struct winbindd_cli_state *state =
 617                 talloc_get_type_abort(private_data, struct winbindd_cli_state);
 618
 619         if (!success) {
 620                 state->finished = True;
 621                 return;
 622         }
 623
 624         if (*(uint32 *)(&state->request) != sizeof(state->request)) {
 625                 DEBUG(0,("request_len_recv: Invalid request size received: %d (expected %u)\n",
 626                          *(uint32_t *)(&state->request), (uint32_t)sizeof(state->request)));
 627                 state->finished = True;
 628                 return;
 629         }
 630
 631         setup_async_read(&state->fd_event, (uint32 *)(&state->request)+1,
 632                          sizeof(state->request) - sizeof(uint32),
 633                          request_main_recv, state);
 634 }
 635
 636 static void request_main_recv(void *private_data, bool success)
 637 {
 638         struct winbindd_cli_state *state =
 639                 talloc_get_type_abort(private_data, struct winbindd_cli_state);
 640
 641         if (!success) {
 642                 state->finished = True;
 643                 return;
 644         }
 645
 646         if (state->request.extra_len == 0) {
 647                 state->request.extra_data.data = NULL;
 648                 request_recv(state, True);
 649                 return;
 650         }
 651
 652         if ((!state->privileged) &&
 653             (state->request.extra_len > WINBINDD_MAX_EXTRA_DATA)) {
 654                 DEBUG(3, ("Got request with %d bytes extra data on "
 655                           "unprivileged socket\n", (int)state->request.extra_len));
 656                 state->request.extra_data.data = NULL;
 657                 state->finished = True;
 658                 return;
 659         }
 660
 661         state->request.extra_data.data =
 662                 SMB_MALLOC_ARRAY(char, state->request.extra_len + 1);
 663
 664         if (state->request.extra_data.data == NULL) {
 665                 DEBUG(0, ("malloc failed\n"));
 666                 state->finished = True;
 667                 return;
 668         }
 669
 670         /* Ensure null termination */
 671         state->request.extra_data.data[state->request.extra_len] = '\0';
 672
 673         setup_async_read(&state->fd_event, state->request.extra_data.data,
 674                          state->request.extra_len, request_recv, state);
 675 }
 676
 677 static void request_recv(void *private_data, bool success)
 678 {
 679         struct winbindd_cli_state *state =
 680                 talloc_get_type_abort(private_data, struct winbindd_cli_state);
 681
 682         if (!success) {
 683                 state->finished = True;
 684                 return;
 685         }
 686
 687         process_request(state);
 688 }
 689
 690 /* Process a new connection by adding it to the client connection list */
 691
 692 static void new_connection(int listen_sock, bool privileged)
 693 {
 694         struct sockaddr_un sunaddr;
 695         struct winbindd_cli_state *state;
 696         socklen_t len;
 697         int sock;
 698
 699         /* Accept connection */
 700
 701         len = sizeof(sunaddr);
 702
 703         do {
 704                 sock = accept(listen_sock, (struct sockaddr *)&sunaddr, &len);
 705         } while (sock == -1 && errno == EINTR);
 706
 707         if (sock == -1)
 708                 return;
 709
 710         DEBUG(6,("accepted socket %d\n", sock));
 711
 712         /* Create new connection structure */
 713
 714         if ((state = TALLOC_ZERO_P(NULL, struct winbindd_cli_state)) == NULL) {
 715                 close(sock);
 716                 return;
 717         }
 718
 719         state->sock = sock;
 720
 721         state->last_access = time(NULL);
 722
 723         state->privileged = privileged;
 724
 725         state->fd_event.fd = state->sock;
 726         state->fd_event.flags = 0;
 727         add_fd_event(&state->fd_event);
 728
 729         setup_async_read(&state->fd_event, &state->request, sizeof(uint32),
 730                          request_len_recv, state);
 731
 732         /* Add to connection list */
 733
 734         winbindd_add_client(state);
 735 }
 736
 737 /* Remove a client connection from client connection list */
 738
 739 static void remove_client(struct winbindd_cli_state *state)
 740 {
 741         /* It's a dead client - hold a funeral */
 742
 743         if (state == NULL) {
 744                 return;
 745         }
 746
 747         /* Close socket */
 748
 749         close(state->sock);
 750
 751         /* Free any getent state */
 752
 753         free_getent_state(state->getpwent_state);
 754         free_getent_state(state->getgrent_state);
 755
 756         /* We may have some extra data that was not freed if the client was
 757            killed unexpectedly */
 758
 759         SAFE_FREE(state->response.extra_data.data);
 760
 761         if (state->mem_ctx != NULL) {
 762                 talloc_destroy(state->mem_ctx);
 763                 state->mem_ctx = NULL;
 764         }
 765
 766         remove_fd_event(&state->fd_event);
 767
 768         /* Remove from list and free */
 769
 770         winbindd_remove_client(state);
 771         TALLOC_FREE(state);
 772 }
 773
 774 /* Shutdown client connection which has been idle for the longest time */
 775
 776 static bool remove_idle_client(void)
 777 {
 778         struct winbindd_cli_state *state, *remove_state = NULL;
 779         time_t last_access = 0;
 780         int nidle = 0;
 781
 782         for (state = winbindd_client_list(); state; state = state->next) {
 783                 if (state->response.result != WINBINDD_PENDING &&
 784                     !state->getpwent_state && !state->getgrent_state) {
 785                         nidle++;
 786                         if (!last_access || state->last_access < last_access) {
 787                                 last_access = state->last_access;
 788                                 remove_state = state;
 789                         }
 790                 }
 791         }
 792
 793         if (remove_state) {
 794                 DEBUG(5,("Found %d idle client connections, shutting down sock %d, pid %u\n",
 795                         nidle, remove_state->sock, (unsigned int)remove_state->pid));
 796                 remove_client(remove_state);
 797                 return True;
 798         }
 799
 800         return False;
 801 }
 802
 803 /* check if HUP has been received and reload files */
 804 void winbind_check_sighup(void)
 805 {
 806         if (do_sighup) {
 807
 808                 DEBUG(3, ("got SIGHUP\n"));
 809
 810                 flush_caches();
 811                 reload_services_file();
 812
 813                 do_sighup = False;
 814         }
 815 }
 816
 817 /* check if TERM has been received */
 818 void winbind_check_sigterm(bool is_parent)
 819 {
 820         if (do_sigterm)
 821                 terminate(is_parent);
 822 }
 823
 824 /* Process incoming clients on listen_sock.  We use a tricky non-blocking,
 825    non-forking, non-threaded model which allows us to handle many
 826    simultaneous connections while remaining impervious to many denial of
 827    service attacks. */
 828
 829 static void process_loop(void)
 830 {
 831         struct winbindd_cli_state *state;
 832         struct fd_event *ev;
 833         fd_set r_fds, w_fds;
 834         int maxfd, listen_sock, listen_priv_sock, selret;
 835         struct timeval timeout, ev_timeout;
 836
 837         /* Open Sockets here to get stuff going ASAP */
 838         listen_sock = open_winbindd_socket();
 839         listen_priv_sock = open_winbindd_priv_socket();
 840
 841         if (listen_sock == -1 || listen_priv_sock == -1) {
 842                 perror("open_winbind_socket");
 843                 exit(1);
 844         }
 845
 846         /* We'll be doing this a lot */
 847
 848         /* Handle messages */
 849
 850         message_dispatch(winbind_messaging_context());
 851
 852         run_events(winbind_event_context(), 0, NULL, NULL);
 853
 854         /* refresh the trusted domain cache */
 855
 856         rescan_trusted_domains();
 857
 858         /* Initialise fd lists for select() */
 859
 860         maxfd = MAX(listen_sock, listen_priv_sock);
 861
 862         FD_ZERO(&r_fds);
 863         FD_ZERO(&w_fds);
 864         FD_SET(listen_sock, &r_fds);
 865         FD_SET(listen_priv_sock, &r_fds);
 866
 867         timeout.tv_sec = WINBINDD_ESTABLISH_LOOP;
 868         timeout.tv_usec = 0;
 869
 870         /* Check for any event timeouts. */
 871         if (get_timed_events_timeout(winbind_event_context(), &ev_timeout)) {
 872                 timeout = timeval_min(&timeout, &ev_timeout);
 873         }
 874
 875         /* Set up client readers and writers */
 876
 877         state = winbindd_client_list();
 878
 879         while (state) {
 880
 881                 struct winbindd_cli_state *next = state->next;
 882
 883                 /* Dispose of client connection if it is marked as
 884                    finished */
 885
 886                 if (state->finished)
 887                         remove_client(state);
 888
 889                 state = next;
 890         }
 891
 892         for (ev = fd_events; ev; ev = ev->next) {
 893                 if (ev->flags & EVENT_FD_READ) {
 894                         FD_SET(ev->fd, &r_fds);
 895                         maxfd = MAX(ev->fd, maxfd);
 896                 }
 897                 if (ev->flags & EVENT_FD_WRITE) {
 898                         FD_SET(ev->fd, &w_fds);
 899                         maxfd = MAX(ev->fd, maxfd);
 900                 }
 901         }
 902
 903         /* Call select */
 904
 905         selret = sys_select(maxfd + 1, &r_fds, &w_fds, NULL, &timeout);
 906
 907         if (selret == 0) {
 908                 goto no_fds_ready;
 909         }
 910
 911         if (selret == -1) {
 912                 if (errno == EINTR) {
 913                         goto no_fds_ready;
 914                 }
 915
 916                 /* Select error, something is badly wrong */
 917
 918                 perror("select");
 919                 exit(1);
 920         }
 921
 922         /* selret > 0 */
 923
 924         ev = fd_events;
 925         while (ev != NULL) {
 926                 struct fd_event *next = ev->next;
 927                 int flags = 0;
 928                 if (FD_ISSET(ev->fd, &r_fds))
 929                         flags |= EVENT_FD_READ;
 930                 if (FD_ISSET(ev->fd, &w_fds))
 931                         flags |= EVENT_FD_WRITE;
 932                 if (flags)
 933                         ev->handler(ev, flags);
 934                 ev = next;
 935         }
 936
 937         if (FD_ISSET(listen_sock, &r_fds)) {
 938                 while (winbindd_num_clients() >
 939                        WINBINDD_MAX_SIMULTANEOUS_CLIENTS - 1) {
 940                         DEBUG(5,("winbindd: Exceeding %d client "
 941                                  "connections, removing idle "
 942                                  "connection.\n",
 943                                  WINBINDD_MAX_SIMULTANEOUS_CLIENTS));
 944                         if (!remove_idle_client()) {
 945                                 DEBUG(0,("winbindd: Exceeding %d "
 946                                          "client connections, no idle "
 947                                          "connection found\n",
 948                                          WINBINDD_MAX_SIMULTANEOUS_CLIENTS));
 949                                 break;
 950                         }
 951                 }
 952                 /* new, non-privileged connection */
 953                 new_connection(listen_sock, False);
 954         }
 955
 956         if (FD_ISSET(listen_priv_sock, &r_fds)) {
 957                 while (winbindd_num_clients() >
 958                        WINBINDD_MAX_SIMULTANEOUS_CLIENTS - 1) {
 959                         DEBUG(5,("winbindd: Exceeding %d client "
 960                                  "connections, removing idle "
 961                                  "connection.\n",
 962                                  WINBINDD_MAX_SIMULTANEOUS_CLIENTS));
 963                         if (!remove_idle_client()) {
 964                                 DEBUG(0,("winbindd: Exceeding %d "
 965                                          "client connections, no idle "
 966                                          "connection found\n",
 967                                          WINBINDD_MAX_SIMULTANEOUS_CLIENTS));
 968                                 break;
 969                         }
 970                 }
 971                 /* new, privileged connection */
 972                 new_connection(listen_priv_sock, True);
 973         }
 974
 975  no_fds_ready:
 976
 977 #if 0
 978         winbindd_check_cache_size(time(NULL));
 979 #endif
 980
 981         /* Check signal handling things */
 982
 983         winbind_check_sigterm(true);
 984         winbind_check_sighup();
 985
 986         if (do_sigusr2) {
 987                 print_winbindd_status();
 988                 do_sigusr2 = False;
 989         }
 990
 991         if (do_sigchld) {
 992                 pid_t pid;
 993
 994                 do_sigchld = False;
 995
 996                 while ((pid = sys_waitpid(-1, NULL, WNOHANG)) > 0) {
 997                         winbind_child_died(pid);
 998                 }
 999         }
1000 }
1001
1002 /* Main function */
1003
1004 int main(int argc, char **argv, char **envp)
1005 {
1006         static bool is_daemon = False;
1007         static bool Fork = True;
1008         static bool log_stdout = False;
1009         static bool no_process_group = False;
1010         enum {
1011                 OPT_DAEMON = 1000,
1012                 OPT_FORK,
1013                 OPT_NO_PROCESS_GROUP,
1014                 OPT_LOG_STDOUT
1015         };
1016         struct poptOption long_options[] = {
1017                 POPT_AUTOHELP
1018                 { "stdout", 'S', POPT_ARG_NONE, NULL, OPT_LOG_STDOUT, "Log to stdout" },
1019                 { "foreground", 'F', POPT_ARG_NONE, NULL, OPT_FORK, "Daemon in foreground mode" },
1020                 { "no-process-group", 0, POPT_ARG_NONE, NULL, OPT_NO_PROCESS_GROUP, "Don't create a new process group" },
1021                 { "daemon", 'D', POPT_ARG_NONE, NULL, OPT_DAEMON, "Become a daemon (default)" },
1022                 { "interactive", 'i', POPT_ARG_NONE, NULL, 'i', "Interactive mode" },
1023                 { "no-caching", 'n', POPT_ARG_NONE, NULL, 'n', "Disable caching" },
1024                 POPT_COMMON_SAMBA
1025                 POPT_TABLEEND
1026         };
1027         poptContext pc;
1028         int opt;
1029         TALLOC_CTX *frame = talloc_stackframe();
1030
1031         /* glibc (?) likes to print "User defined signal 1" and exit if a
1032            SIGUSR[12] is received before a handler is installed */
1033
1034         CatchSignal(SIGUSR1, SIG_IGN);
1035         CatchSignal(SIGUSR2, SIG_IGN);
1036
1037         fault_setup((void (*)(void *))fault_quit );
1038         dump_core_setup("winbindd");
1039
1040         load_case_tables();
1041
1042         db_tdb2_setup_messaging(NULL, false);
1043
1044         /* Initialise for running in non-root mode */
1045
1046         sec_init();
1047
1048         set_remote_machine_name("winbindd", False);
1049
1050         /* Set environment variable so we don't recursively call ourselves.
1051            This may also be useful interactively. */
1052
1053         if ( !winbind_off() ) {
1054                 DEBUG(0,("Failed to disable recusive winbindd calls.  Exiting.\n"));
1055                 exit(1);
1056         }
1057
1058         /* Initialise samba/rpc client stuff */
1059
1060         pc = poptGetContext("winbindd", argc, (const char **)argv, long_options, 0);
1061
1062         while ((opt = poptGetNextOpt(pc)) != -1) {
1063                 switch (opt) {
1064                         /* Don't become a daemon */
1065                 case OPT_DAEMON:
1066                         is_daemon = True;
1067                         break;
1068                 case 'i':
1069                         interactive = True;
1070                         log_stdout = True;
1071                         Fork = False;
1072                         break;
1073                 case OPT_FORK:
1074                         Fork = false;
1075                         break;
1076                 case OPT_NO_PROCESS_GROUP:
1077                         no_process_group = true;
1078                         break;
1079                 case OPT_LOG_STDOUT:
1080                         log_stdout = true;
1081                         break;
1082                 case 'n':
1083                         opt_nocache = true;
1084                         break;
1085                 default:
1086                         d_fprintf(stderr, "\nInvalid option %s: %s\n\n",
1087                                   poptBadOption(pc, 0), poptStrerror(opt));
1088                         poptPrintUsage(pc, stderr, 0);
1089                         exit(1);
1090                 }
1091         }
1092
1093         if (is_daemon && interactive) {
1094                 d_fprintf(stderr,"\nERROR: "
1095                           "Option -i|--interactive is not allowed together with -D|--daemon\n\n");
1096                 poptPrintUsage(pc, stderr, 0);
1097                 exit(1);
1098         }
1099
1100         if (log_stdout && Fork) {
1101                 d_fprintf(stderr, "\nERROR: "
1102                           "Can't log to stdout (-S) unless daemon is in foreground +(-F) or interactive (-i)\n\n");
1103                 poptPrintUsage(pc, stderr, 0);
1104                 exit(1);
1105         }
1106
1107         poptFreeContext(pc);
1108
1109         if (!override_logfile) {
1110                 char *logfile = NULL;
1111                 if (asprintf(&logfile,"%s/log.winbindd",
1112                                 get_dyn_LOGFILEBASE()) > 0) {
1113                         lp_set_logfile(logfile);
1114                         SAFE_FREE(logfile);
1115                 }
1116         }
1117         setup_logging("winbindd", log_stdout);
1118         reopen_logs();
1119
1120         DEBUG(0,("winbindd version %s started.\n", SAMBA_VERSION_STRING));
1121         DEBUGADD(0,("%s\n", COPYRIGHT_STARTUP_MESSAGE));
1122
1123         if (!lp_load_initial_only(get_dyn_CONFIGFILE())) {
1124                 DEBUG(0, ("error opening config file\n"));
1125                 exit(1);
1126         }
1127
1128         /* Initialise messaging system */
1129
1130         if (winbind_messaging_context() == NULL) {
1131                 DEBUG(0, ("unable to initialize messaging system\n"));
1132                 exit(1);
1133         }
1134
1135         db_tdb2_setup_messaging(winbind_messaging_context(), true);
1136
1137         if (!reload_services_file()) {
1138                 DEBUG(0, ("error opening config file\n"));
1139                 exit(1);
1140         }
1141
1142         if (!directory_exist(lp_lockdir(), NULL)) {
1143                 mkdir(lp_lockdir(), 0755);
1144         }
1145
1146         /* Setup names. */
1147
1148         if (!init_names())
1149                 exit(1);
1150
1151         load_interfaces();
1152
1153         if (!secrets_init()) {
1154
1155                 DEBUG(0,("Could not initialize domain trust account secrets. Giving up\n"));
1156                 return False;
1157         }
1158
1159         /* Enable netbios namecache */
1160
1161         namecache_enable();
1162
1163         /* Winbind daemon initialisation */
1164
1165         if ( ! NT_STATUS_IS_OK(idmap_init_cache()) ) {
1166                 DEBUG(1, ("Could not init idmap cache!\n"));
1167         }
1168
1169         /* Unblock all signals we are interested in as they may have been
1170            blocked by the parent process. */
1171
1172         BlockSignals(False, SIGINT);
1173         BlockSignals(False, SIGQUIT);
1174         BlockSignals(False, SIGTERM);
1175         BlockSignals(False, SIGUSR1);
1176         BlockSignals(False, SIGUSR2);
1177         BlockSignals(False, SIGHUP);
1178         BlockSignals(False, SIGCHLD);
1179
1180         /* Setup signal handlers */
1181
1182         CatchSignal(SIGINT, termination_handler);      /* Exit on these sigs */
1183         CatchSignal(SIGQUIT, termination_handler);
1184         CatchSignal(SIGTERM, termination_handler);
1185         CatchSignal(SIGCHLD, sigchld_handler);
1186
1187         CatchSignal(SIGPIPE, SIG_IGN);                 /* Ignore sigpipe */
1188
1189         CatchSignal(SIGUSR2, sigusr2_handler);         /* Debugging sigs */
1190         CatchSignal(SIGHUP, sighup_handler);
1191
1192         if (!interactive)
1193                 become_daemon(Fork, no_process_group);
1194
1195         pidfile_create("winbindd");
1196
1197 #if HAVE_SETPGID
1198         /*
1199          * If we're interactive we want to set our own process group for
1200          * signal management.
1201          */
1202         if (interactive && !no_process_group)
1203                 setpgid( (pid_t)0, (pid_t)0);
1204 #endif
1205
1206         TimeInit();
1207
1208         if (!reinit_after_fork(winbind_messaging_context(), false)) {
1209                 DEBUG(0,("reinit_after_fork() failed\n"));
1210                 exit(1);
1211         }
1212
1213         /*
1214          * Ensure all cache and idmap caches are consistent
1215          * and initialized before we startup.
1216          */
1217         if (!winbindd_cache_validate_and_initialize()) {
1218                 exit(1);
1219         }
1220
1221         /* get broadcast messages */
1222         claim_connection(NULL,"",FLAG_MSG_GENERAL|FLAG_MSG_DBWRAP);
1223
1224         /* React on 'smbcontrol winbindd reload-config' in the same way
1225            as to SIGHUP signal */
1226         messaging_register(winbind_messaging_context(), NULL,
1227                            MSG_SMB_CONF_UPDATED, msg_reload_services);
1228         messaging_register(winbind_messaging_context(), NULL,
1229                            MSG_SHUTDOWN, msg_shutdown);
1230
1231         /* Handle online/offline messages. */
1232         messaging_register(winbind_messaging_context(), NULL,
1233                            MSG_WINBIND_OFFLINE, winbind_msg_offline);
1234         messaging_register(winbind_messaging_context(), NULL,
1235                            MSG_WINBIND_ONLINE, winbind_msg_online);
1236         messaging_register(winbind_messaging_context(), NULL,
1237                            MSG_WINBIND_ONLINESTATUS, winbind_msg_onlinestatus);
1238
1239         messaging_register(winbind_messaging_context(), NULL,
1240                            MSG_DUMP_EVENT_LIST, winbind_msg_dump_event_list);
1241
1242         messaging_register(winbind_messaging_context(), NULL,
1243                            MSG_WINBIND_VALIDATE_CACHE,
1244                            winbind_msg_validate_cache);
1245
1246         messaging_register(winbind_messaging_context(), NULL,
1247                            MSG_WINBIND_DUMP_DOMAIN_LIST,
1248                            winbind_msg_dump_domain_list);
1249
1250         netsamlogon_cache_init(); /* Non-critical */
1251
1252         /* clear the cached list of trusted domains */
1253
1254         wcache_tdc_clear();
1255
1256         if (!init_domain_list()) {
1257                 DEBUG(0,("unable to initialize domain list\n"));
1258                 exit(1);
1259         }
1260
1261         init_idmap_child();
1262         init_locator_child();
1263
1264         smb_nscd_flush_user_cache();
1265         smb_nscd_flush_group_cache();
1266
1267         /* Loop waiting for requests */
1268
1269         TALLOC_FREE(frame);
1270         while (1) {
1271                 frame = talloc_stackframe();
1272                 process_loop();
1273                 TALLOC_FREE(frame);
1274         }
1275
1276         return 0;
1277 }