source3/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                 /* Close the cache to be able to valdite the cache */
 127                 close_winbindd_cache();
 128                 /*
 129                  * Ensure all cache and idmap caches are consistent
 130                  * before we initialize the cache again.
 131                  */
 132                 if (winbindd_validate_cache() < 0) {
 133                         DEBUG(0, ("winbindd cache tdb corrupt and no backup "
 134                                   "could be restore.\n"));
 135                 }
 136
 137                 /* Initialize cache again. */
 138                 if (!initialize_winbindd_cache()) {
 139                         exit(1);
 140                 }
 141         }
 142 }
 143
 144 /* Handle the signal by unlinking socket and exiting */
 145
 146 static void terminate(void)
 147 {
 148         char *path = NULL;
 149
 150         /* Remove socket file */
 151         if (asprintf(&path, "%s/%s",
 152                         get_winbind_pipe_dir(), WINBINDD_SOCKET_NAME) > 0) {
 153                 unlink(path);
 154                 SAFE_FREE(path);
 155         }
 156
 157         idmap_close();
 158
 159         trustdom_cache_shutdown();
 160
 161 #if 0
 162         if (interactive) {
 163                 TALLOC_CTX *mem_ctx = talloc_init("end_description");
 164                 char *description = talloc_describe_all(mem_ctx);
 165
 166                 DEBUG(3, ("tallocs left:\n%s\n", description));
 167                 talloc_destroy(mem_ctx);
 168         }
 169 #endif
 170
 171         exit(0);
 172 }
 173
 174 static bool do_sigterm;
 175
 176 static void termination_handler(int signum)
 177 {
 178         do_sigterm = True;
 179         sys_select_signal(signum);
 180 }
 181
 182 static bool do_sigusr2;
 183
 184 static void sigusr2_handler(int signum)
 185 {
 186         do_sigusr2 = True;
 187         sys_select_signal(SIGUSR2);
 188 }
 189
 190 static bool do_sighup;
 191
 192 static void sighup_handler(int signum)
 193 {
 194         do_sighup = True;
 195         sys_select_signal(SIGHUP);
 196 }
 197
 198 static bool do_sigchld;
 199
 200 static void sigchld_handler(int signum)
 201 {
 202         do_sigchld = True;
 203         sys_select_signal(SIGCHLD);
 204 }
 205
 206 /* React on 'smbcontrol winbindd reload-config' in the same way as on SIGHUP*/
 207 static void msg_reload_services(struct messaging_context *msg,
 208                                 void *private_data,
 209                                 uint32_t msg_type,
 210                                 struct server_id server_id,
 211                                 DATA_BLOB *data)
 212 {
 213         /* Flush various caches */
 214         flush_caches();
 215         reload_services_file();
 216 }
 217
 218 /* React on 'smbcontrol winbindd shutdown' in the same way as on SIGTERM*/
 219 static void msg_shutdown(struct messaging_context *msg,
 220                          void *private_data,
 221                          uint32_t msg_type,
 222                          struct server_id server_id,
 223                          DATA_BLOB *data)
 224 {
 225         do_sigterm = True;
 226 }
 227
 228
 229 static void winbind_msg_validate_cache(struct messaging_context *msg_ctx,
 230                                        void *private_data,
 231                                        uint32_t msg_type,
 232                                        struct server_id server_id,
 233                                        DATA_BLOB *data)
 234 {
 235         uint8 ret;
 236         pid_t child_pid;
 237         struct sigaction act;
 238         struct sigaction oldact;
 239
 240         DEBUG(10, ("winbindd_msg_validate_cache: got validate-cache "
 241                    "message.\n"));
 242
 243         /*
 244          * call the validation code from a child:
 245          * so we don't block the main winbindd and the validation
 246          * code can safely use fork/waitpid...
 247          */
 248         CatchChild();
 249         child_pid = sys_fork();
 250
 251         if (child_pid == -1) {
 252                 DEBUG(1, ("winbind_msg_validate_cache: Could not fork: %s\n",
 253                           strerror(errno)));
 254                 return;
 255         }
 256
 257         if (child_pid != 0) {
 258                 /* parent */
 259                 DEBUG(5, ("winbind_msg_validate_cache: child created with "
 260                           "pid %d.\n", child_pid));
 261                 return;
 262         }
 263
 264         /* child */
 265
 266         /* install default SIGCHLD handler: validation code uses fork/waitpid */
 267         ZERO_STRUCT(act);
 268         act.sa_handler = SIG_DFL;
 269 #ifdef SA_RESTART
 270         /* We *want* SIGALRM to interrupt a system call. */
 271         act.sa_flags = SA_RESTART;
 272 #endif
 273         sigemptyset(&act.sa_mask);
 274         sigaddset(&act.sa_mask,SIGCHLD);
 275         sigaction(SIGCHLD,&act,&oldact);
 276
 277         ret = (uint8)winbindd_validate_cache_nobackup();
 278         DEBUG(10, ("winbindd_msg_validata_cache: got return value %d\n", ret));
 279         messaging_send_buf(msg_ctx, server_id, MSG_WINBIND_VALIDATE_CACHE, &ret,
 280                            (size_t)1);
 281         _exit(0);
 282 }
 283
 284 static struct winbindd_dispatch_table {
 285         enum winbindd_cmd cmd;
 286         void (*fn)(struct winbindd_cli_state *state);
 287         const char *winbindd_cmd_name;
 288 } dispatch_table[] = {
 289
 290         /* User functions */
 291
 292         { WINBINDD_GETPWNAM, winbindd_getpwnam, "GETPWNAM" },
 293         { WINBINDD_GETPWUID, winbindd_getpwuid, "GETPWUID" },
 294
 295         { WINBINDD_SETPWENT, winbindd_setpwent, "SETPWENT" },
 296         { WINBINDD_ENDPWENT, winbindd_endpwent, "ENDPWENT" },
 297         { WINBINDD_GETPWENT, winbindd_getpwent, "GETPWENT" },
 298
 299         { WINBINDD_GETGROUPS, winbindd_getgroups, "GETGROUPS" },
 300         { WINBINDD_GETUSERSIDS, winbindd_getusersids, "GETUSERSIDS" },
 301         { WINBINDD_GETUSERDOMGROUPS, winbindd_getuserdomgroups,
 302           "GETUSERDOMGROUPS" },
 303
 304         /* Group functions */
 305
 306         { WINBINDD_GETGRNAM, winbindd_getgrnam, "GETGRNAM" },
 307         { WINBINDD_GETGRGID, winbindd_getgrgid, "GETGRGID" },
 308         { WINBINDD_SETGRENT, winbindd_setgrent, "SETGRENT" },
 309         { WINBINDD_ENDGRENT, winbindd_endgrent, "ENDGRENT" },
 310         { WINBINDD_GETGRENT, winbindd_getgrent, "GETGRENT" },
 311         { WINBINDD_GETGRLST, winbindd_getgrent, "GETGRLST" },
 312
 313         /* PAM auth functions */
 314
 315         { WINBINDD_PAM_AUTH, winbindd_pam_auth, "PAM_AUTH" },
 316         { WINBINDD_PAM_AUTH_CRAP, winbindd_pam_auth_crap, "AUTH_CRAP" },
 317         { WINBINDD_PAM_CHAUTHTOK, winbindd_pam_chauthtok, "CHAUTHTOK" },
 318         { WINBINDD_PAM_LOGOFF, winbindd_pam_logoff, "PAM_LOGOFF" },
 319         { WINBINDD_PAM_CHNG_PSWD_AUTH_CRAP, winbindd_pam_chng_pswd_auth_crap, "CHNG_PSWD_AUTH_CRAP" },
 320
 321         /* Enumeration functions */
 322
 323         { WINBINDD_LIST_USERS, winbindd_list_users, "LIST_USERS" },
 324         { WINBINDD_LIST_GROUPS, winbindd_list_groups, "LIST_GROUPS" },
 325         { WINBINDD_LIST_TRUSTDOM, winbindd_list_trusted_domains,
 326           "LIST_TRUSTDOM" },
 327         { WINBINDD_SHOW_SEQUENCE, winbindd_show_sequence, "SHOW_SEQUENCE" },
 328
 329         /* SID related functions */
 330
 331         { WINBINDD_LOOKUPSID, winbindd_lookupsid, "LOOKUPSID" },
 332         { WINBINDD_LOOKUPNAME, winbindd_lookupname, "LOOKUPNAME" },
 333         { WINBINDD_LOOKUPRIDS, winbindd_lookuprids, "LOOKUPRIDS" },
 334
 335         /* Lookup related functions */
 336
 337         { WINBINDD_SID_TO_UID, winbindd_sid_to_uid, "SID_TO_UID" },
 338         { WINBINDD_SID_TO_GID, winbindd_sid_to_gid, "SID_TO_GID" },
 339         { WINBINDD_UID_TO_SID, winbindd_uid_to_sid, "UID_TO_SID" },
 340         { WINBINDD_GID_TO_SID, winbindd_gid_to_sid, "GID_TO_SID" },
 341 #if 0   /* DISABLED until we fix the interface in Samba 3.0.26 --jerry */
 342         { WINBINDD_SIDS_TO_XIDS, winbindd_sids_to_unixids, "SIDS_TO_XIDS" },
 343 #endif  /* end DISABLED */
 344         { WINBINDD_ALLOCATE_UID, winbindd_allocate_uid, "ALLOCATE_UID" },
 345         { WINBINDD_ALLOCATE_GID, winbindd_allocate_gid, "ALLOCATE_GID" },
 346         { WINBINDD_SET_MAPPING, winbindd_set_mapping, "SET_MAPPING" },
 347         { WINBINDD_SET_HWM, winbindd_set_hwm, "SET_HWMS" },
 348
 349         /* Miscellaneous */
 350
 351         { WINBINDD_CHECK_MACHACC, winbindd_check_machine_acct, "CHECK_MACHACC" },
 352         { WINBINDD_PING, winbindd_ping, "PING" },
 353         { WINBINDD_INFO, winbindd_info, "INFO" },
 354         { WINBINDD_INTERFACE_VERSION, winbindd_interface_version,
 355           "INTERFACE_VERSION" },
 356         { WINBINDD_DOMAIN_NAME, winbindd_domain_name, "DOMAIN_NAME" },
 357         { WINBINDD_DOMAIN_INFO, winbindd_domain_info, "DOMAIN_INFO" },
 358         { WINBINDD_NETBIOS_NAME, winbindd_netbios_name, "NETBIOS_NAME" },
 359         { WINBINDD_PRIV_PIPE_DIR, winbindd_priv_pipe_dir,
 360           "WINBINDD_PRIV_PIPE_DIR" },
 361         { WINBINDD_GETDCNAME, winbindd_getdcname, "GETDCNAME" },
 362         { WINBINDD_DSGETDCNAME, winbindd_dsgetdcname, "DSGETDCNAME" },
 363
 364         /* Credential cache access */
 365         { WINBINDD_CCACHE_NTLMAUTH, winbindd_ccache_ntlm_auth, "NTLMAUTH" },
 366
 367         /* WINS functions */
 368
 369         { WINBINDD_WINS_BYNAME, winbindd_wins_byname, "WINS_BYNAME" },
 370         { WINBINDD_WINS_BYIP, winbindd_wins_byip, "WINS_BYIP" },
 371
 372         /* End of list */
 373
 374         { WINBINDD_NUM_CMDS, NULL, "NONE" }
 375 };
 376
 377 static void process_request(struct winbindd_cli_state *state)
 378 {
 379         struct winbindd_dispatch_table *table = dispatch_table;
 380
 381         /* Free response data - we may be interrupted and receive another
 382            command before being able to send this data off. */
 383
 384         SAFE_FREE(state->response.extra_data.data);
 385
 386         ZERO_STRUCT(state->response);
 387
 388         state->response.result = WINBINDD_PENDING;
 389         state->response.length = sizeof(struct winbindd_response);
 390
 391         state->mem_ctx = talloc_init("winbind request");
 392         if (state->mem_ctx == NULL)
 393                 return;
 394
 395         /* Remember who asked us. */
 396         state->pid = state->request.pid;
 397
 398         /* Process command */
 399
 400         for (table = dispatch_table; table->fn; table++) {
 401                 if (state->request.cmd == table->cmd) {
 402                         DEBUG(10,("process_request: request fn %s\n",
 403                                   table->winbindd_cmd_name ));
 404                         table->fn(state);
 405                         break;
 406                 }
 407         }
 408
 409         if (!table->fn) {
 410                 DEBUG(10,("process_request: unknown request fn number %d\n",
 411                           (int)state->request.cmd ));
 412                 request_error(state);
 413         }
 414 }
 415
 416 /*
 417  * A list of file descriptors being monitored by select in the main processing
 418  * loop. fd_event->handler is called whenever the socket is readable/writable.
 419  */
 420
 421 static struct fd_event *fd_events = NULL;
 422
 423 void add_fd_event(struct fd_event *ev)
 424 {
 425         struct fd_event *match;
 426
 427         /* only add unique fd_event structs */
 428
 429         for (match=fd_events; match; match=match->next ) {
 430 #ifdef DEVELOPER
 431                 SMB_ASSERT( match != ev );
 432 #else
 433                 if ( match == ev )
 434                         return;
 435 #endif
 436         }
 437
 438         DLIST_ADD(fd_events, ev);
 439 }
 440
 441 void remove_fd_event(struct fd_event *ev)
 442 {
 443         DLIST_REMOVE(fd_events, ev);
 444 }
 445
 446 /*
 447  * Handler for fd_events to complete a read/write request, set up by
 448  * setup_async_read/setup_async_write.
 449  */
 450
 451 static void rw_callback(struct fd_event *event, int flags)
 452 {
 453         size_t todo;
 454         ssize_t done = 0;
 455
 456         todo = event->length - event->done;
 457
 458         if (event->flags & EVENT_FD_WRITE) {
 459                 SMB_ASSERT(flags == EVENT_FD_WRITE);
 460                 done = sys_write(event->fd,
 461                                  &((char *)event->data)[event->done],
 462                                  todo);
 463
 464                 if (done <= 0) {
 465                         event->flags = 0;
 466                         event->finished(event->private_data, False);
 467                         return;
 468                 }
 469         }
 470
 471         if (event->flags & EVENT_FD_READ) {
 472                 SMB_ASSERT(flags == EVENT_FD_READ);
 473                 done = sys_read(event->fd, &((char *)event->data)[event->done],
 474                                 todo);
 475
 476                 if (done <= 0) {
 477                         event->flags = 0;
 478                         event->finished(event->private_data, False);
 479                         return;
 480                 }
 481         }
 482
 483         event->done += done;
 484
 485         if (event->done == event->length) {
 486                 event->flags = 0;
 487                 event->finished(event->private_data, True);
 488         }
 489 }
 490
 491 /*
 492  * Request an async read/write on a fd_event structure. (*finished) is called
 493  * when the request is completed or an error had occurred.
 494  */
 495
 496 void setup_async_read(struct fd_event *event, void *data, size_t length,
 497                       void (*finished)(void *private_data, bool success),
 498                       void *private_data)
 499 {
 500         SMB_ASSERT(event->flags == 0);
 501         event->data = data;
 502         event->length = length;
 503         event->done = 0;
 504         event->handler = rw_callback;
 505         event->finished = finished;
 506         event->private_data = private_data;
 507         event->flags = EVENT_FD_READ;
 508 }
 509
 510 void setup_async_write(struct fd_event *event, void *data, size_t length,
 511                        void (*finished)(void *private_data, bool success),
 512                        void *private_data)
 513 {
 514         SMB_ASSERT(event->flags == 0);
 515         event->data = data;
 516         event->length = length;
 517         event->done = 0;
 518         event->handler = rw_callback;
 519         event->finished = finished;
 520         event->private_data = private_data;
 521         event->flags = EVENT_FD_WRITE;
 522 }
 523
 524 /*
 525  * This is the main event loop of winbind requests. It goes through a
 526  * state-machine of 3 read/write requests, 4 if you have extra data to send.
 527  *
 528  * An idle winbind client has a read request of 4 bytes outstanding,
 529  * finalizing function is request_len_recv, checking the length. request_recv
 530  * then processes the packet. The processing function then at some point has
 531  * to call request_finished which schedules sending the response.
 532  */
 533
 534 static void request_len_recv(void *private_data, bool success);
 535 static void request_recv(void *private_data, bool success);
 536 static void request_main_recv(void *private_data, bool success);
 537 static void request_finished(struct winbindd_cli_state *state);
 538 void request_finished_cont(void *private_data, bool success);
 539 static void response_main_sent(void *private_data, bool success);
 540 static void response_extra_sent(void *private_data, bool success);
 541
 542 static void response_extra_sent(void *private_data, bool success)
 543 {
 544         struct winbindd_cli_state *state =
 545                 talloc_get_type_abort(private_data, struct winbindd_cli_state);
 546
 547         if (state->mem_ctx != NULL) {
 548                 talloc_destroy(state->mem_ctx);
 549                 state->mem_ctx = NULL;
 550         }
 551
 552         if (!success) {
 553                 state->finished = True;
 554                 return;
 555         }
 556
 557         SAFE_FREE(state->request.extra_data.data);
 558         SAFE_FREE(state->response.extra_data.data);
 559
 560         setup_async_read(&state->fd_event, &state->request, sizeof(uint32),
 561                          request_len_recv, state);
 562 }
 563
 564 static void response_main_sent(void *private_data, bool success)
 565 {
 566         struct winbindd_cli_state *state =
 567                 talloc_get_type_abort(private_data, struct winbindd_cli_state);
 568
 569         if (!success) {
 570                 state->finished = True;
 571                 return;
 572         }
 573
 574         if (state->response.length == sizeof(state->response)) {
 575                 if (state->mem_ctx != NULL) {
 576                         talloc_destroy(state->mem_ctx);
 577                         state->mem_ctx = NULL;
 578                 }
 579
 580                 setup_async_read(&state->fd_event, &state->request,
 581                                  sizeof(uint32), request_len_recv, state);
 582                 return;
 583         }
 584
 585         setup_async_write(&state->fd_event, state->response.extra_data.data,
 586                           state->response.length - sizeof(state->response),
 587                           response_extra_sent, state);
 588 }
 589
 590 static void request_finished(struct winbindd_cli_state *state)
 591 {
 592         setup_async_write(&state->fd_event, &state->response,
 593                           sizeof(state->response), response_main_sent, state);
 594 }
 595
 596 void request_error(struct winbindd_cli_state *state)
 597 {
 598         SMB_ASSERT(state->response.result == WINBINDD_PENDING);
 599         state->response.result = WINBINDD_ERROR;
 600         request_finished(state);
 601 }
 602
 603 void request_ok(struct winbindd_cli_state *state)
 604 {
 605         SMB_ASSERT(state->response.result == WINBINDD_PENDING);
 606         state->response.result = WINBINDD_OK;
 607         request_finished(state);
 608 }
 609
 610 void request_finished_cont(void *private_data, bool success)
 611 {
 612         struct winbindd_cli_state *state =
 613                 talloc_get_type_abort(private_data, struct winbindd_cli_state);
 614
 615         if (success)
 616                 request_ok(state);
 617         else
 618                 request_error(state);
 619 }
 620
 621 static void request_len_recv(void *private_data, bool success)
 622 {
 623         struct winbindd_cli_state *state =
 624                 talloc_get_type_abort(private_data, struct winbindd_cli_state);
 625
 626         if (!success) {
 627                 state->finished = True;
 628                 return;
 629         }
 630
 631         if (*(uint32 *)(&state->request) != sizeof(state->request)) {
 632                 DEBUG(0,("request_len_recv: Invalid request size received: %d (expected %u)\n",
 633                          *(uint32_t *)(&state->request), (uint32_t)sizeof(state->request)));
 634                 state->finished = True;
 635                 return;
 636         }
 637
 638         setup_async_read(&state->fd_event, (uint32 *)(&state->request)+1,
 639                          sizeof(state->request) - sizeof(uint32),
 640                          request_main_recv, state);
 641 }
 642
 643 static void request_main_recv(void *private_data, bool success)
 644 {
 645         struct winbindd_cli_state *state =
 646                 talloc_get_type_abort(private_data, struct winbindd_cli_state);
 647
 648         if (!success) {
 649                 state->finished = True;
 650                 return;
 651         }
 652
 653         if (state->request.extra_len == 0) {
 654                 state->request.extra_data.data = NULL;
 655                 request_recv(state, True);
 656                 return;
 657         }
 658
 659         if ((!state->privileged) &&
 660             (state->request.extra_len > WINBINDD_MAX_EXTRA_DATA)) {
 661                 DEBUG(3, ("Got request with %d bytes extra data on "
 662                           "unprivileged socket\n", (int)state->request.extra_len));
 663                 state->request.extra_data.data = NULL;
 664                 state->finished = True;
 665                 return;
 666         }
 667
 668         state->request.extra_data.data =
 669                 SMB_MALLOC_ARRAY(char, state->request.extra_len + 1);
 670
 671         if (state->request.extra_data.data == NULL) {
 672                 DEBUG(0, ("malloc failed\n"));
 673                 state->finished = True;
 674                 return;
 675         }
 676
 677         /* Ensure null termination */
 678         state->request.extra_data.data[state->request.extra_len] = '\0';
 679
 680         setup_async_read(&state->fd_event, state->request.extra_data.data,
 681                          state->request.extra_len, request_recv, state);
 682 }
 683
 684 static void request_recv(void *private_data, bool success)
 685 {
 686         struct winbindd_cli_state *state =
 687                 talloc_get_type_abort(private_data, struct winbindd_cli_state);
 688
 689         if (!success) {
 690                 state->finished = True;
 691                 return;
 692         }
 693
 694         process_request(state);
 695 }
 696
 697 /* Process a new connection by adding it to the client connection list */
 698
 699 static void new_connection(int listen_sock, bool privileged)
 700 {
 701         struct sockaddr_un sunaddr;
 702         struct winbindd_cli_state *state;
 703         socklen_t len;
 704         int sock;
 705
 706         /* Accept connection */
 707
 708         len = sizeof(sunaddr);
 709
 710         do {
 711                 sock = accept(listen_sock, (struct sockaddr *)&sunaddr, &len);
 712         } while (sock == -1 && errno == EINTR);
 713
 714         if (sock == -1)
 715                 return;
 716
 717         DEBUG(6,("accepted socket %d\n", sock));
 718
 719         /* Create new connection structure */
 720
 721         if ((state = TALLOC_ZERO_P(NULL, struct winbindd_cli_state)) == NULL) {
 722                 close(sock);
 723                 return;
 724         }
 725
 726         state->sock = sock;
 727
 728         state->last_access = time(NULL);
 729
 730         state->privileged = privileged;
 731
 732         state->fd_event.fd = state->sock;
 733         state->fd_event.flags = 0;
 734         add_fd_event(&state->fd_event);
 735
 736         setup_async_read(&state->fd_event, &state->request, sizeof(uint32),
 737                          request_len_recv, state);
 738
 739         /* Add to connection list */
 740
 741         winbindd_add_client(state);
 742 }
 743
 744 /* Remove a client connection from client connection list */
 745
 746 static void remove_client(struct winbindd_cli_state *state)
 747 {
 748         /* It's a dead client - hold a funeral */
 749
 750         if (state == NULL) {
 751                 return;
 752         }
 753
 754         /* Close socket */
 755
 756         close(state->sock);
 757
 758         /* Free any getent state */
 759
 760         free_getent_state(state->getpwent_state);
 761         free_getent_state(state->getgrent_state);
 762
 763         /* We may have some extra data that was not freed if the client was
 764            killed unexpectedly */
 765
 766         SAFE_FREE(state->response.extra_data.data);
 767
 768         if (state->mem_ctx != NULL) {
 769                 talloc_destroy(state->mem_ctx);
 770                 state->mem_ctx = NULL;
 771         }
 772
 773         remove_fd_event(&state->fd_event);
 774
 775         /* Remove from list and free */
 776
 777         winbindd_remove_client(state);
 778         TALLOC_FREE(state);
 779 }
 780
 781 /* Shutdown client connection which has been idle for the longest time */
 782
 783 static bool remove_idle_client(void)
 784 {
 785         struct winbindd_cli_state *state, *remove_state = NULL;
 786         time_t last_access = 0;
 787         int nidle = 0;
 788
 789         for (state = winbindd_client_list(); state; state = state->next) {
 790                 if (state->response.result != WINBINDD_PENDING &&
 791                     !state->getpwent_state && !state->getgrent_state) {
 792                         nidle++;
 793                         if (!last_access || state->last_access < last_access) {
 794                                 last_access = state->last_access;
 795                                 remove_state = state;
 796                         }
 797                 }
 798         }
 799
 800         if (remove_state) {
 801                 DEBUG(5,("Found %d idle client connections, shutting down sock %d, pid %u\n",
 802                         nidle, remove_state->sock, (unsigned int)remove_state->pid));
 803                 remove_client(remove_state);
 804                 return True;
 805         }
 806
 807         return False;
 808 }
 809
 810 /* Process incoming clients on listen_sock.  We use a tricky non-blocking,
 811    non-forking, non-threaded model which allows us to handle many
 812    simultaneous connections while remaining impervious to many denial of
 813    service attacks. */
 814
 815 static void process_loop(void)
 816 {
 817         struct winbindd_cli_state *state;
 818         struct fd_event *ev;
 819         fd_set r_fds, w_fds;
 820         int maxfd, listen_sock, listen_priv_sock, selret;
 821         struct timeval timeout, ev_timeout;
 822
 823         /* Open Sockets here to get stuff going ASAP */
 824         listen_sock = open_winbindd_socket();
 825         listen_priv_sock = open_winbindd_priv_socket();
 826
 827         if (listen_sock == -1 || listen_priv_sock == -1) {
 828                 perror("open_winbind_socket");
 829                 exit(1);
 830         }
 831
 832         /* We'll be doing this a lot */
 833
 834         /* Handle messages */
 835
 836         message_dispatch(winbind_messaging_context());
 837
 838         run_events(winbind_event_context(), 0, NULL, NULL);
 839
 840         /* refresh the trusted domain cache */
 841
 842         rescan_trusted_domains();
 843
 844         /* Initialise fd lists for select() */
 845
 846         maxfd = MAX(listen_sock, listen_priv_sock);
 847
 848         FD_ZERO(&r_fds);
 849         FD_ZERO(&w_fds);
 850         FD_SET(listen_sock, &r_fds);
 851         FD_SET(listen_priv_sock, &r_fds);
 852
 853         timeout.tv_sec = WINBINDD_ESTABLISH_LOOP;
 854         timeout.tv_usec = 0;
 855
 856         /* Check for any event timeouts. */
 857         if (get_timed_events_timeout(winbind_event_context(), &ev_timeout)) {
 858                 timeout = timeval_min(&timeout, &ev_timeout);
 859         }
 860
 861         /* Set up client readers and writers */
 862
 863         state = winbindd_client_list();
 864
 865         while (state) {
 866
 867                 struct winbindd_cli_state *next = state->next;
 868
 869                 /* Dispose of client connection if it is marked as
 870                    finished */
 871
 872                 if (state->finished)
 873                         remove_client(state);
 874
 875                 state = next;
 876         }
 877
 878         for (ev = fd_events; ev; ev = ev->next) {
 879                 if (ev->flags & EVENT_FD_READ) {
 880                         FD_SET(ev->fd, &r_fds);
 881                         maxfd = MAX(ev->fd, maxfd);
 882                 }
 883                 if (ev->flags & EVENT_FD_WRITE) {
 884                         FD_SET(ev->fd, &w_fds);
 885                         maxfd = MAX(ev->fd, maxfd);
 886                 }
 887         }
 888
 889         /* Call select */
 890
 891         selret = sys_select(maxfd + 1, &r_fds, &w_fds, NULL, &timeout);
 892
 893         if (selret == 0) {
 894                 goto no_fds_ready;
 895         }
 896
 897         if (selret == -1) {
 898                 if (errno == EINTR) {
 899                         goto no_fds_ready;
 900                 }
 901
 902                 /* Select error, something is badly wrong */
 903
 904                 perror("select");
 905                 exit(1);
 906         }
 907
 908         /* selret > 0 */
 909
 910         ev = fd_events;
 911         while (ev != NULL) {
 912                 struct fd_event *next = ev->next;
 913                 int flags = 0;
 914                 if (FD_ISSET(ev->fd, &r_fds))
 915                         flags |= EVENT_FD_READ;
 916                 if (FD_ISSET(ev->fd, &w_fds))
 917                         flags |= EVENT_FD_WRITE;
 918                 if (flags)
 919                         ev->handler(ev, flags);
 920                 ev = next;
 921         }
 922
 923         if (FD_ISSET(listen_sock, &r_fds)) {
 924                 while (winbindd_num_clients() >
 925                        WINBINDD_MAX_SIMULTANEOUS_CLIENTS - 1) {
 926                         DEBUG(5,("winbindd: Exceeding %d client "
 927                                  "connections, removing idle "
 928                                  "connection.\n",
 929                                  WINBINDD_MAX_SIMULTANEOUS_CLIENTS));
 930                         if (!remove_idle_client()) {
 931                                 DEBUG(0,("winbindd: Exceeding %d "
 932                                          "client connections, no idle "
 933                                          "connection found\n",
 934                                          WINBINDD_MAX_SIMULTANEOUS_CLIENTS));
 935                                 break;
 936                         }
 937                 }
 938                 /* new, non-privileged connection */
 939                 new_connection(listen_sock, False);
 940         }
 941
 942         if (FD_ISSET(listen_priv_sock, &r_fds)) {
 943                 while (winbindd_num_clients() >
 944                        WINBINDD_MAX_SIMULTANEOUS_CLIENTS - 1) {
 945                         DEBUG(5,("winbindd: Exceeding %d client "
 946                                  "connections, removing idle "
 947                                  "connection.\n",
 948                                  WINBINDD_MAX_SIMULTANEOUS_CLIENTS));
 949                         if (!remove_idle_client()) {
 950                                 DEBUG(0,("winbindd: Exceeding %d "
 951                                          "client connections, no idle "
 952                                          "connection found\n",
 953                                          WINBINDD_MAX_SIMULTANEOUS_CLIENTS));
 954                                 break;
 955                         }
 956                 }
 957                 /* new, privileged connection */
 958                 new_connection(listen_priv_sock, True);
 959         }
 960
 961  no_fds_ready:
 962
 963 #if 0
 964         winbindd_check_cache_size(time(NULL));
 965 #endif
 966
 967         /* Check signal handling things */
 968
 969         if (do_sigterm)
 970                 terminate();
 971
 972         if (do_sighup) {
 973
 974                 DEBUG(3, ("got SIGHUP\n"));
 975
 976                 flush_caches();
 977                 reload_services_file();
 978
 979                 do_sighup = False;
 980         }
 981
 982         if (do_sigusr2) {
 983                 print_winbindd_status();
 984                 do_sigusr2 = False;
 985         }
 986
 987         if (do_sigchld) {
 988                 pid_t pid;
 989
 990                 do_sigchld = False;
 991
 992                 while ((pid = sys_waitpid(-1, NULL, WNOHANG)) > 0) {
 993                         winbind_child_died(pid);
 994                 }
 995         }
 996 }
 997
 998 /* Main function */
 999
1000 int main(int argc, char **argv, char **envp)
1001 {
1002         static bool is_daemon = False;
1003         static bool Fork = True;
1004         static bool log_stdout = False;
1005         static bool no_process_group = False;
1006         enum {
1007                 OPT_DAEMON = 1000,
1008                 OPT_FORK,
1009                 OPT_NO_PROCESS_GROUP,
1010                 OPT_LOG_STDOUT
1011         };
1012         struct poptOption long_options[] = {
1013                 POPT_AUTOHELP
1014                 { "stdout", 'S', POPT_ARG_NONE, NULL, OPT_LOG_STDOUT, "Log to stdout" },
1015                 { "foreground", 'F', POPT_ARG_NONE, NULL, OPT_FORK, "Daemon in foreground mode" },
1016                 { "no-process-group", 0, POPT_ARG_NONE, NULL, OPT_NO_PROCESS_GROUP, "Don't create a new process group" },
1017                 { "daemon", 'D', POPT_ARG_NONE, NULL, OPT_DAEMON, "Become a daemon (default)" },
1018                 { "interactive", 'i', POPT_ARG_NONE, NULL, 'i', "Interactive mode" },
1019                 { "no-caching", 'n', POPT_ARG_NONE, NULL, 'n', "Disable caching" },
1020                 POPT_COMMON_SAMBA
1021                 POPT_TABLEEND
1022         };
1023         poptContext pc;
1024         int opt;
1025         TALLOC_CTX *frame = talloc_stackframe();
1026
1027         /* glibc (?) likes to print "User defined signal 1" and exit if a
1028            SIGUSR[12] is received before a handler is installed */
1029
1030         CatchSignal(SIGUSR1, SIG_IGN);
1031         CatchSignal(SIGUSR2, SIG_IGN);
1032
1033         fault_setup((void (*)(void *))fault_quit );
1034         dump_core_setup("winbindd");
1035
1036         load_case_tables();
1037
1038         /* Initialise for running in non-root mode */
1039
1040         sec_init();
1041
1042         set_remote_machine_name("winbindd", False);
1043
1044         /* Set environment variable so we don't recursively call ourselves.
1045            This may also be useful interactively. */
1046
1047         if ( !winbind_off() ) {
1048                 DEBUG(0,("Failed to disable recusive winbindd calls.  Exiting.\n"));
1049                 exit(1);
1050         }
1051
1052         /* Initialise samba/rpc client stuff */
1053
1054         pc = poptGetContext("winbindd", argc, (const char **)argv, long_options, 0);
1055
1056         while ((opt = poptGetNextOpt(pc)) != -1) {
1057                 switch (opt) {
1058                         /* Don't become a daemon */
1059                 case OPT_DAEMON:
1060                         is_daemon = True;
1061                         break;
1062                 case 'i':
1063                         interactive = True;
1064                         log_stdout = True;
1065                         Fork = False;
1066                         break;
1067                 case OPT_FORK:
1068                         Fork = false;
1069                         break;
1070                 case OPT_NO_PROCESS_GROUP:
1071                         no_process_group = true;
1072                         break;
1073                 case OPT_LOG_STDOUT:
1074                         log_stdout = true;
1075                         break;
1076                 case 'n':
1077                         opt_nocache = true;
1078                         break;
1079                 default:
1080                         d_fprintf(stderr, "\nInvalid option %s: %s\n\n",
1081                                   poptBadOption(pc, 0), poptStrerror(opt));
1082                         poptPrintUsage(pc, stderr, 0);
1083                         exit(1);
1084                 }
1085         }
1086
1087         if (is_daemon && interactive) {
1088                 d_fprintf(stderr,"\nERROR: "
1089                           "Option -i|--interactive is not allowed together with -D|--daemon\n\n");
1090                 poptPrintUsage(pc, stderr, 0);
1091                 exit(1);
1092         }
1093
1094         if (log_stdout && Fork) {
1095                 d_fprintf(stderr, "\nERROR: "
1096                           "Can't log to stdout (-S) unless daemon is in foreground +(-F) or interactive (-i)\n\n");
1097                 poptPrintUsage(pc, stderr, 0);
1098                 exit(1);
1099         }
1100
1101         poptFreeContext(pc);
1102
1103         if (!override_logfile) {
1104                 char *logfile = NULL;
1105                 if (asprintf(&logfile,"%s/log.winbindd",
1106                                 get_dyn_LOGFILEBASE()) > 0) {
1107                         lp_set_logfile(logfile);
1108                         SAFE_FREE(logfile);
1109                 }
1110         }
1111         setup_logging("winbindd", log_stdout);
1112         reopen_logs();
1113
1114         DEBUG(0,("winbindd version %s started.\n", SAMBA_VERSION_STRING));
1115         DEBUGADD(0,("%s\n", COPYRIGHT_STARTUP_MESSAGE));
1116
1117         if (!reload_services_file()) {
1118                 DEBUG(0, ("error opening config file\n"));
1119                 exit(1);
1120         }
1121
1122         if (!directory_exist(lp_lockdir(), NULL)) {
1123                 mkdir(lp_lockdir(), 0755);
1124         }
1125
1126         /* Setup names. */
1127
1128         if (!init_names())
1129                 exit(1);
1130
1131         load_interfaces();
1132
1133         if (!secrets_init()) {
1134
1135                 DEBUG(0,("Could not initialize domain trust account secrets. Giving up\n"));
1136                 return False;
1137         }
1138
1139         /* Enable netbios namecache */
1140
1141         namecache_enable();
1142
1143         /* Winbind daemon initialisation */
1144
1145         if ( ! NT_STATUS_IS_OK(idmap_init_cache()) ) {
1146                 DEBUG(1, ("Could not init idmap cache!\n"));
1147         }
1148
1149         /* Unblock all signals we are interested in as they may have been
1150            blocked by the parent process. */
1151
1152         BlockSignals(False, SIGINT);
1153         BlockSignals(False, SIGQUIT);
1154         BlockSignals(False, SIGTERM);
1155         BlockSignals(False, SIGUSR1);
1156         BlockSignals(False, SIGUSR2);
1157         BlockSignals(False, SIGHUP);
1158         BlockSignals(False, SIGCHLD);
1159
1160         /* Setup signal handlers */
1161
1162         CatchSignal(SIGINT, termination_handler);      /* Exit on these sigs */
1163         CatchSignal(SIGQUIT, termination_handler);
1164         CatchSignal(SIGTERM, termination_handler);
1165         CatchSignal(SIGCHLD, sigchld_handler);
1166
1167         CatchSignal(SIGPIPE, SIG_IGN);                 /* Ignore sigpipe */
1168
1169         CatchSignal(SIGUSR2, sigusr2_handler);         /* Debugging sigs */
1170         CatchSignal(SIGHUP, sighup_handler);
1171
1172         if (!interactive)
1173                 become_daemon(Fork, no_process_group);
1174
1175         pidfile_create("winbindd");
1176
1177 #if HAVE_SETPGID
1178         /*
1179          * If we're interactive we want to set our own process group for
1180          * signal management.
1181          */
1182         if (interactive && !no_process_group)
1183                 setpgid( (pid_t)0, (pid_t)0);
1184 #endif
1185
1186         TimeInit();
1187
1188         /* Initialise messaging system */
1189
1190         if (winbind_messaging_context() == NULL) {
1191                 DEBUG(0, ("unable to initialize messaging system\n"));
1192                 exit(1);
1193         }
1194
1195         /*
1196          * Ensure all cache and idmap caches are consistent
1197          * before we startup.
1198          */
1199         if (winbindd_validate_cache() < 0) {
1200                 DEBUG(0, ("corrupted tdb found, trying to restore backup\n"));
1201         }
1202
1203         /* Initialize cache (ensure version is correct). */
1204         if (!initialize_winbindd_cache()) {
1205                 exit(1);
1206         }
1207
1208         /* React on 'smbcontrol winbindd reload-config' in the same way
1209            as to SIGHUP signal */
1210         messaging_register(winbind_messaging_context(), NULL,
1211                            MSG_SMB_CONF_UPDATED, msg_reload_services);
1212         messaging_register(winbind_messaging_context(), NULL,
1213                            MSG_SHUTDOWN, msg_shutdown);
1214
1215         /* Handle online/offline messages. */
1216         messaging_register(winbind_messaging_context(), NULL,
1217                            MSG_WINBIND_OFFLINE, winbind_msg_offline);
1218         messaging_register(winbind_messaging_context(), NULL,
1219                            MSG_WINBIND_ONLINE, winbind_msg_online);
1220         messaging_register(winbind_messaging_context(), NULL,
1221                            MSG_WINBIND_ONLINESTATUS, winbind_msg_onlinestatus);
1222
1223         messaging_register(winbind_messaging_context(), NULL,
1224                            MSG_DUMP_EVENT_LIST, winbind_msg_dump_event_list);
1225
1226         messaging_register(winbind_messaging_context(), NULL,
1227                            MSG_WINBIND_VALIDATE_CACHE,
1228                            winbind_msg_validate_cache);
1229
1230         messaging_register(winbind_messaging_context(), NULL,
1231                            MSG_WINBIND_DUMP_DOMAIN_LIST,
1232                            winbind_msg_dump_domain_list);
1233
1234         netsamlogon_cache_init(); /* Non-critical */
1235
1236         /* clear the cached list of trusted domains */
1237
1238         wcache_tdc_clear();
1239
1240         if (!init_domain_list()) {
1241                 DEBUG(0,("unable to initalize domain list\n"));
1242                 exit(1);
1243         }
1244
1245         init_idmap_child();
1246         init_locator_child();
1247
1248         smb_nscd_flush_user_cache();
1249         smb_nscd_flush_group_cache();
1250
1251         /* Loop waiting for requests */
1252
1253         TALLOC_FREE(frame);
1254         while (1) {
1255                 frame = talloc_stackframe();
1256                 process_loop();
1257                 TALLOC_FREE(frame);
1258         }
1259
1260         return 0;
1261 }