source/nsswitch/winbindd.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3
   4    Winbind daemon for ntdom nss module
   5
   6    Copyright (C) by Tim Potter 2000-2002
   7    Copyright (C) Andrew Tridgell 2002
   8    Copyright (C) Jelmer Vernooij 2003
   9    Copyright (C) Volker Lendecke 2004
  10
  11    This program is free software; you can redistribute it and/or modify
  12    it under the terms of the GNU General Public License as published by
  13    the Free Software Foundation; either version 2 of the License, or
  14    (at your option) any later version.
  15
  16    This program is distributed in the hope that it will be useful,
  17    but WITHOUT ANY WARRANTY; without even the implied warranty of
  18    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19    GNU General Public License for more details.
  20
  21    You should have received a copy of the GNU General Public License
  22    along with this program; if not, write to the Free Software
  23    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  24 */
  25
  26 #include "includes.h"
  27 #include "winbindd.h"
  28
  29 #undef DBGC_CLASS
  30 #define DBGC_CLASS DBGC_WINBIND
  31
  32 BOOL opt_nocache = False;
  33 static BOOL interactive = False;
  34
  35 extern BOOL override_logfile;
  36
  37 struct event_context *winbind_event_context(void)
  38 {
  39         static struct event_context *ctx;
  40
  41         if (!ctx && !(ctx = event_context_init(NULL))) {
  42                 smb_panic("Could not init winbind event context\n");
  43         }
  44         return ctx;
  45 }
  46
  47 /* Reload configuration */
  48
  49 static BOOL reload_services_file(const char *logfile)
  50 {
  51         BOOL ret;
  52
  53         if (lp_loaded()) {
  54                 pstring fname;
  55
  56                 pstrcpy(fname,lp_configfile());
  57                 if (file_exist(fname,NULL) && !strcsequal(fname,dyn_CONFIGFILE)) {
  58                         pstrcpy(dyn_CONFIGFILE,fname);
  59                 }
  60         }
  61
  62         reopen_logs();
  63         ret = lp_load(dyn_CONFIGFILE,False,False,True,True);
  64
  65         /* if this is a child, restore the logfile to the special
  66            name - <domain>, idmap, etc. */
  67         if (logfile && *logfile)
  68                 lp_set_logfile(logfile);
  69
  70         reopen_logs();
  71         load_interfaces();
  72
  73         return(ret);
  74 }
  75
  76
  77 /**************************************************************************** **
  78  Handle a fault..
  79  **************************************************************************** */
  80
  81 static void fault_quit(void)
  82 {
  83         dump_core();
  84 }
  85
  86 static void winbindd_status(void)
  87 {
  88         struct winbindd_cli_state *tmp;
  89
  90         DEBUG(0, ("winbindd status:\n"));
  91
  92         /* Print client state information */
  93
  94         DEBUG(0, ("\t%d clients currently active\n", winbindd_num_clients()));
  95
  96         if (DEBUGLEVEL >= 2 && winbindd_num_clients()) {
  97                 DEBUG(2, ("\tclient list:\n"));
  98                 for(tmp = winbindd_client_list(); tmp; tmp = tmp->next) {
  99                         DEBUGADD(2, ("\t\tpid %lu, sock %d\n",
 100                                   (unsigned long)tmp->pid, tmp->sock));
 101                 }
 102         }
 103 }
 104
 105 /* Print winbindd status to log file */
 106
 107 static void print_winbindd_status(void)
 108 {
 109         winbindd_status();
 110 }
 111
 112 /* Flush client cache */
 113
 114 static void flush_caches(void)
 115 {
 116         /* We need to invalidate cached user list entries on a SIGHUP
 117            otherwise cached access denied errors due to restrict anonymous
 118            hang around until the sequence number changes. */
 119
 120         wcache_invalidate_cache();
 121 }
 122
 123 /* Handle the signal by unlinking socket and exiting */
 124
 125 static void terminate(bool in_parent)
 126 {
 127         if (in_parent) {
 128                 /* When parent goes away we should
 129                  * remove the socket file. Not so
 130                  * when children terminate.
 131                  */
 132
 133                 pstring path;
 134
 135                 /* Remove socket file */
 136                 pstr_sprintf(path, "%s/%s",
 137                         WINBINDD_SOCKET_DIR, WINBINDD_SOCKET_NAME);
 138                 unlink(path);
 139         }
 140
 141         idmap_close();
 142
 143         trustdom_cache_shutdown();
 144
 145 #if 0
 146         if (interactive) {
 147                 TALLOC_CTX *mem_ctx = talloc_init("end_description");
 148                 char *description = talloc_describe_all(mem_ctx);
 149
 150                 DEBUG(3, ("tallocs left:\n%s\n", description));
 151                 talloc_destroy(mem_ctx);
 152         }
 153 #endif
 154
 155         exit(0);
 156 }
 157
 158 static BOOL do_sigterm;
 159
 160 static void termination_handler(int signum)
 161 {
 162         do_sigterm = True;
 163         sys_select_signal(signum);
 164 }
 165
 166 static BOOL do_sigusr2;
 167
 168 static void sigusr2_handler(int signum)
 169 {
 170         do_sigusr2 = True;
 171         sys_select_signal(SIGUSR2);
 172 }
 173
 174 static BOOL do_sighup;
 175
 176 static void sighup_handler(int signum)
 177 {
 178         do_sighup = True;
 179         sys_select_signal(SIGHUP);
 180 }
 181
 182 static BOOL do_sigchld;
 183
 184 static void sigchld_handler(int signum)
 185 {
 186         do_sigchld = True;
 187         sys_select_signal(SIGCHLD);
 188 }
 189
 190 /* React on 'smbcontrol winbindd reload-config' in the same way as on SIGHUP*/
 191 static void msg_reload_services(int msg_type, struct process_id src,
 192                                 void *buf, size_t len, void *private_data)
 193 {
 194         /* Flush various caches */
 195         flush_caches();
 196         reload_services_file((const char *) private_data);
 197 }
 198
 199 /* React on 'smbcontrol winbindd shutdown' in the same way as on SIGTERM*/
 200 static void msg_shutdown(int msg_type, struct process_id src,
 201                          void *buf, size_t len, void *private_data)
 202 {
 203         do_sigterm = True;
 204 }
 205
 206 static struct winbindd_dispatch_table {
 207         enum winbindd_cmd cmd;
 208         void (*fn)(struct winbindd_cli_state *state);
 209         const char *winbindd_cmd_name;
 210 } dispatch_table[] = {
 211
 212         /* User functions */
 213
 214         { WINBINDD_GETPWNAM, winbindd_getpwnam, "GETPWNAM" },
 215         { WINBINDD_GETPWUID, winbindd_getpwuid, "GETPWUID" },
 216
 217         { WINBINDD_SETPWENT, winbindd_setpwent, "SETPWENT" },
 218         { WINBINDD_ENDPWENT, winbindd_endpwent, "ENDPWENT" },
 219         { WINBINDD_GETPWENT, winbindd_getpwent, "GETPWENT" },
 220
 221         { WINBINDD_GETGROUPS, winbindd_getgroups, "GETGROUPS" },
 222         { WINBINDD_GETUSERSIDS, winbindd_getusersids, "GETUSERSIDS" },
 223         { WINBINDD_GETUSERDOMGROUPS, winbindd_getuserdomgroups,
 224           "GETUSERDOMGROUPS" },
 225
 226         /* Group functions */
 227
 228         { WINBINDD_GETGRNAM, winbindd_getgrnam, "GETGRNAM" },
 229         { WINBINDD_GETGRGID, winbindd_getgrgid, "GETGRGID" },
 230         { WINBINDD_SETGRENT, winbindd_setgrent, "SETGRENT" },
 231         { WINBINDD_ENDGRENT, winbindd_endgrent, "ENDGRENT" },
 232         { WINBINDD_GETGRENT, winbindd_getgrent, "GETGRENT" },
 233         { WINBINDD_GETGRLST, winbindd_getgrent, "GETGRLST" },
 234
 235         /* PAM auth functions */
 236
 237         { WINBINDD_PAM_AUTH, winbindd_pam_auth, "PAM_AUTH" },
 238         { WINBINDD_PAM_AUTH_CRAP, winbindd_pam_auth_crap, "AUTH_CRAP" },
 239         { WINBINDD_PAM_CHAUTHTOK, winbindd_pam_chauthtok, "CHAUTHTOK" },
 240         { WINBINDD_PAM_LOGOFF, winbindd_pam_logoff, "PAM_LOGOFF" },
 241         { WINBINDD_PAM_CHNG_PSWD_AUTH_CRAP, winbindd_pam_chng_pswd_auth_crap, "CHNG_PSWD_AUTH_CRAP" },
 242
 243         /* Enumeration functions */
 244
 245         { WINBINDD_LIST_USERS, winbindd_list_users, "LIST_USERS" },
 246         { WINBINDD_LIST_GROUPS, winbindd_list_groups, "LIST_GROUPS" },
 247         { WINBINDD_LIST_TRUSTDOM, winbindd_list_trusted_domains,
 248           "LIST_TRUSTDOM" },
 249         { WINBINDD_SHOW_SEQUENCE, winbindd_show_sequence, "SHOW_SEQUENCE" },
 250
 251         /* SID related functions */
 252
 253         { WINBINDD_LOOKUPSID, winbindd_lookupsid, "LOOKUPSID" },
 254         { WINBINDD_LOOKUPNAME, winbindd_lookupname, "LOOKUPNAME" },
 255         { WINBINDD_LOOKUPRIDS, winbindd_lookuprids, "LOOKUPRIDS" },
 256
 257         /* Lookup related functions */
 258
 259         { WINBINDD_SID_TO_UID, winbindd_sid_to_uid, "SID_TO_UID" },
 260         { WINBINDD_SID_TO_GID, winbindd_sid_to_gid, "SID_TO_GID" },
 261         { WINBINDD_UID_TO_SID, winbindd_uid_to_sid, "UID_TO_SID" },
 262         { WINBINDD_GID_TO_SID, winbindd_gid_to_sid, "GID_TO_SID" },
 263 #if 0   /* DISABLED until we fix the interface in Samba 3.0.26 --jerry */
 264         { WINBINDD_SIDS_TO_XIDS, winbindd_sids_to_unixids, "SIDS_TO_XIDS" },
 265 #endif  /* end DISABLED */
 266         { WINBINDD_ALLOCATE_UID, winbindd_allocate_uid, "ALLOCATE_UID" },
 267         { WINBINDD_ALLOCATE_GID, winbindd_allocate_gid, "ALLOCATE_GID" },
 268         { WINBINDD_SET_MAPPING, winbindd_set_mapping, "SET_MAPPING" },
 269         { WINBINDD_SET_HWM, winbindd_set_hwm, "SET_HWMS" },
 270
 271         /* Miscellaneous */
 272
 273         { WINBINDD_DUMP_MAPS, winbindd_dump_maps, "DUMP_MAPS" },
 274
 275         { WINBINDD_CHECK_MACHACC, winbindd_check_machine_acct, "CHECK_MACHACC" },
 276         { WINBINDD_PING, winbindd_ping, "PING" },
 277         { WINBINDD_INFO, winbindd_info, "INFO" },
 278         { WINBINDD_INTERFACE_VERSION, winbindd_interface_version,
 279           "INTERFACE_VERSION" },
 280         { WINBINDD_DOMAIN_NAME, winbindd_domain_name, "DOMAIN_NAME" },
 281         { WINBINDD_DOMAIN_INFO, winbindd_domain_info, "DOMAIN_INFO" },
 282         { WINBINDD_NETBIOS_NAME, winbindd_netbios_name, "NETBIOS_NAME" },
 283         { WINBINDD_PRIV_PIPE_DIR, winbindd_priv_pipe_dir,
 284           "WINBINDD_PRIV_PIPE_DIR" },
 285         { WINBINDD_GETDCNAME, winbindd_getdcname, "GETDCNAME" },
 286
 287         /* Credential cache access */
 288         { WINBINDD_CCACHE_NTLMAUTH, winbindd_ccache_ntlm_auth, "NTLMAUTH" },
 289
 290         /* WINS functions */
 291
 292         { WINBINDD_WINS_BYNAME, winbindd_wins_byname, "WINS_BYNAME" },
 293         { WINBINDD_WINS_BYIP, winbindd_wins_byip, "WINS_BYIP" },
 294
 295         /* End of list */
 296
 297         { WINBINDD_NUM_CMDS, NULL, "NONE" }
 298 };
 299
 300 static void process_request(struct winbindd_cli_state *state)
 301 {
 302         struct winbindd_dispatch_table *table = dispatch_table;
 303
 304         /* Free response data - we may be interrupted and receive another
 305            command before being able to send this data off. */
 306
 307         SAFE_FREE(state->response.extra_data.data);
 308
 309         ZERO_STRUCT(state->response);
 310
 311         state->response.result = WINBINDD_PENDING;
 312         state->response.length = sizeof(struct winbindd_response);
 313
 314         state->mem_ctx = talloc_init("winbind request");
 315         if (state->mem_ctx == NULL)
 316                 return;
 317
 318         /* Remember who asked us. */
 319         state->pid = state->request.pid;
 320
 321         /* Process command */
 322
 323         for (table = dispatch_table; table->fn; table++) {
 324                 if (state->request.cmd == table->cmd) {
 325                         DEBUG(10,("process_request: request fn %s\n",
 326                                   table->winbindd_cmd_name ));
 327                         table->fn(state);
 328                         break;
 329                 }
 330         }
 331
 332         if (!table->fn) {
 333                 DEBUG(10,("process_request: unknown request fn number %d\n",
 334                           (int)state->request.cmd ));
 335                 request_error(state);
 336         }
 337 }
 338
 339 /*
 340  * A list of file descriptors being monitored by select in the main processing
 341  * loop. fd_event->handler is called whenever the socket is readable/writable.
 342  */
 343
 344 static struct fd_event *fd_events = NULL;
 345
 346 void add_fd_event(struct fd_event *ev)
 347 {
 348         struct fd_event *match;
 349
 350         /* only add unique fd_event structs */
 351
 352         for (match=fd_events; match; match=match->next ) {
 353 #ifdef DEVELOPER
 354                 SMB_ASSERT( match != ev );
 355 #else
 356                 if ( match == ev )
 357                         return;
 358 #endif
 359         }
 360
 361         DLIST_ADD(fd_events, ev);
 362 }
 363
 364 void remove_fd_event(struct fd_event *ev)
 365 {
 366         DLIST_REMOVE(fd_events, ev);
 367 }
 368
 369 /*
 370  * Handler for fd_events to complete a read/write request, set up by
 371  * setup_async_read/setup_async_write.
 372  */
 373
 374 static void rw_callback(struct fd_event *event, int flags)
 375 {
 376         size_t todo;
 377         ssize_t done = 0;
 378
 379         todo = event->length - event->done;
 380
 381         if (event->flags & EVENT_FD_WRITE) {
 382                 SMB_ASSERT(flags == EVENT_FD_WRITE);
 383                 done = sys_write(event->fd,
 384                                  &((char *)event->data)[event->done],
 385                                  todo);
 386
 387                 if (done <= 0) {
 388                         event->flags = 0;
 389                         event->finished(event->private_data, False);
 390                         return;
 391                 }
 392         }
 393
 394         if (event->flags & EVENT_FD_READ) {
 395                 SMB_ASSERT(flags == EVENT_FD_READ);
 396                 done = sys_read(event->fd, &((char *)event->data)[event->done],
 397                                 todo);
 398
 399                 if (done <= 0) {
 400                         event->flags = 0;
 401                         event->finished(event->private_data, False);
 402                         return;
 403                 }
 404         }
 405
 406         event->done += done;
 407
 408         if (event->done == event->length) {
 409                 event->flags = 0;
 410                 event->finished(event->private_data, True);
 411         }
 412 }
 413
 414 /*
 415  * Request an async read/write on a fd_event structure. (*finished) is called
 416  * when the request is completed or an error had occurred.
 417  */
 418
 419 void setup_async_read(struct fd_event *event, void *data, size_t length,
 420                       void (*finished)(void *private_data, BOOL success),
 421                       void *private_data)
 422 {
 423         SMB_ASSERT(event->flags == 0);
 424         event->data = data;
 425         event->length = length;
 426         event->done = 0;
 427         event->handler = rw_callback;
 428         event->finished = finished;
 429         event->private_data = private_data;
 430         event->flags = EVENT_FD_READ;
 431 }
 432
 433 void setup_async_write(struct fd_event *event, void *data, size_t length,
 434                        void (*finished)(void *private_data, BOOL success),
 435                        void *private_data)
 436 {
 437         SMB_ASSERT(event->flags == 0);
 438         event->data = data;
 439         event->length = length;
 440         event->done = 0;
 441         event->handler = rw_callback;
 442         event->finished = finished;
 443         event->private_data = private_data;
 444         event->flags = EVENT_FD_WRITE;
 445 }
 446
 447 /*
 448  * This is the main event loop of winbind requests. It goes through a
 449  * state-machine of 3 read/write requests, 4 if you have extra data to send.
 450  *
 451  * An idle winbind client has a read request of 4 bytes outstanding,
 452  * finalizing function is request_len_recv, checking the length. request_recv
 453  * then processes the packet. The processing function then at some point has
 454  * to call request_finished which schedules sending the response.
 455  */
 456
 457 static void request_len_recv(void *private_data, BOOL success);
 458 static void request_recv(void *private_data, BOOL success);
 459 static void request_main_recv(void *private_data, BOOL success);
 460 static void request_finished(struct winbindd_cli_state *state);
 461 void request_finished_cont(void *private_data, BOOL success);
 462 static void response_main_sent(void *private_data, BOOL success);
 463 static void response_extra_sent(void *private_data, BOOL success);
 464
 465 static void response_extra_sent(void *private_data, BOOL success)
 466 {
 467         struct winbindd_cli_state *state =
 468                 talloc_get_type_abort(private_data, struct winbindd_cli_state);
 469
 470         if (state->mem_ctx != NULL) {
 471                 talloc_destroy(state->mem_ctx);
 472                 state->mem_ctx = NULL;
 473         }
 474
 475         if (!success) {
 476                 state->finished = True;
 477                 return;
 478         }
 479
 480         SAFE_FREE(state->response.extra_data.data);
 481
 482         setup_async_read(&state->fd_event, &state->request, sizeof(uint32),
 483                          request_len_recv, state);
 484 }
 485
 486 static void response_main_sent(void *private_data, BOOL success)
 487 {
 488         struct winbindd_cli_state *state =
 489                 talloc_get_type_abort(private_data, struct winbindd_cli_state);
 490
 491         if (!success) {
 492                 state->finished = True;
 493                 return;
 494         }
 495
 496         if (state->response.length == sizeof(state->response)) {
 497                 if (state->mem_ctx != NULL) {
 498                         talloc_destroy(state->mem_ctx);
 499                         state->mem_ctx = NULL;
 500                 }
 501
 502                 setup_async_read(&state->fd_event, &state->request,
 503                                  sizeof(uint32), request_len_recv, state);
 504                 return;
 505         }
 506
 507         setup_async_write(&state->fd_event, state->response.extra_data.data,
 508                           state->response.length - sizeof(state->response),
 509                           response_extra_sent, state);
 510 }
 511
 512 static void request_finished(struct winbindd_cli_state *state)
 513 {
 514         /* Make sure request.extra_data is freed when finish processing a request */
 515         SAFE_FREE(state->request.extra_data.data);
 516         setup_async_write(&state->fd_event, &state->response,
 517                           sizeof(state->response), response_main_sent, state);
 518 }
 519
 520 void request_error(struct winbindd_cli_state *state)
 521 {
 522         SMB_ASSERT(state->response.result == WINBINDD_PENDING);
 523         state->response.result = WINBINDD_ERROR;
 524         request_finished(state);
 525 }
 526
 527 void request_ok(struct winbindd_cli_state *state)
 528 {
 529         SMB_ASSERT(state->response.result == WINBINDD_PENDING);
 530         state->response.result = WINBINDD_OK;
 531         request_finished(state);
 532 }
 533
 534 void request_finished_cont(void *private_data, BOOL success)
 535 {
 536         struct winbindd_cli_state *state =
 537                 talloc_get_type_abort(private_data, struct winbindd_cli_state);
 538
 539         if (success)
 540                 request_ok(state);
 541         else
 542                 request_error(state);
 543 }
 544
 545 static void request_len_recv(void *private_data, BOOL success)
 546 {
 547         struct winbindd_cli_state *state =
 548                 talloc_get_type_abort(private_data, struct winbindd_cli_state);
 549
 550         if (!success) {
 551                 state->finished = True;
 552                 return;
 553         }
 554
 555         if (*(uint32 *)(&state->request) != sizeof(state->request)) {
 556                 DEBUG(0,("request_len_recv: Invalid request size received: %d (expected %d)\n",
 557                          *(uint32 *)(&state->request), (uint32)sizeof(state->request)));
 558                 state->finished = True;
 559                 return;
 560         }
 561
 562         setup_async_read(&state->fd_event, (uint32 *)(&state->request)+1,
 563                          sizeof(state->request) - sizeof(uint32),
 564                          request_main_recv, state);
 565 }
 566
 567 static void request_main_recv(void *private_data, BOOL success)
 568 {
 569         struct winbindd_cli_state *state =
 570                 talloc_get_type_abort(private_data, struct winbindd_cli_state);
 571
 572         if (!success) {
 573                 state->finished = True;
 574                 return;
 575         }
 576
 577         if (state->request.extra_len == 0) {
 578                 state->request.extra_data.data = NULL;
 579                 request_recv(state, True);
 580                 return;
 581         }
 582
 583         if ((!state->privileged) &&
 584             (state->request.extra_len > WINBINDD_MAX_EXTRA_DATA)) {
 585                 DEBUG(3, ("Got request with %d bytes extra data on "
 586                           "unprivileged socket\n", (int)state->request.extra_len));
 587                 state->request.extra_data.data = NULL;
 588                 state->finished = True;
 589                 return;
 590         }
 591
 592         state->request.extra_data.data =
 593                 SMB_MALLOC_ARRAY(char, state->request.extra_len + 1);
 594
 595         if (state->request.extra_data.data == NULL) {
 596                 DEBUG(0, ("malloc failed\n"));
 597                 state->finished = True;
 598                 return;
 599         }
 600
 601         /* Ensure null termination */
 602         state->request.extra_data.data[state->request.extra_len] = '\0';
 603
 604         setup_async_read(&state->fd_event, state->request.extra_data.data,
 605                          state->request.extra_len, request_recv, state);
 606 }
 607
 608 static void request_recv(void *private_data, BOOL success)
 609 {
 610         struct winbindd_cli_state *state =
 611                 talloc_get_type_abort(private_data, struct winbindd_cli_state);
 612
 613         if (!success) {
 614                 state->finished = True;
 615                 return;
 616         }
 617
 618         process_request(state);
 619 }
 620
 621 /* Process a new connection by adding it to the client connection list */
 622
 623 static void new_connection(int listen_sock, BOOL privileged)
 624 {
 625         struct sockaddr_un sunaddr;
 626         struct winbindd_cli_state *state;
 627         socklen_t len;
 628         int sock;
 629
 630         /* Accept connection */
 631
 632         len = sizeof(sunaddr);
 633
 634         do {
 635                 sock = accept(listen_sock, (struct sockaddr *)&sunaddr, &len);
 636         } while (sock == -1 && errno == EINTR);
 637
 638         if (sock == -1)
 639                 return;
 640
 641         DEBUG(6,("accepted socket %d\n", sock));
 642
 643         /* Create new connection structure */
 644
 645         if ((state = TALLOC_ZERO_P(NULL, struct winbindd_cli_state)) == NULL) {
 646                 close(sock);
 647                 return;
 648         }
 649
 650         state->sock = sock;
 651
 652         state->last_access = time(NULL);
 653
 654         state->privileged = privileged;
 655
 656         state->fd_event.fd = state->sock;
 657         state->fd_event.flags = 0;
 658         add_fd_event(&state->fd_event);
 659
 660         setup_async_read(&state->fd_event, &state->request, sizeof(uint32),
 661                          request_len_recv, state);
 662
 663         /* Add to connection list */
 664
 665         winbindd_add_client(state);
 666 }
 667
 668 /* Remove a client connection from client connection list */
 669
 670 static void remove_client(struct winbindd_cli_state *state)
 671 {
 672         char c = 0;
 673
 674         /* It's a dead client - hold a funeral */
 675
 676         if (state == NULL) {
 677                 return;
 678         }
 679
 680         /* tell client, we are closing ... */
 681         write(state->sock, &c, sizeof(c));
 682
 683         /* Close socket */
 684
 685         close(state->sock);
 686
 687         /* Free any getent state */
 688
 689         free_getent_state(state->getpwent_state);
 690         free_getent_state(state->getgrent_state);
 691
 692         /* We may have some extra data that was not freed if the client was
 693            killed unexpectedly */
 694
 695         SAFE_FREE(state->response.extra_data.data);
 696
 697         if (state->mem_ctx != NULL) {
 698                 talloc_destroy(state->mem_ctx);
 699                 state->mem_ctx = NULL;
 700         }
 701
 702         remove_fd_event(&state->fd_event);
 703
 704         /* Remove from list and free */
 705
 706         winbindd_remove_client(state);
 707         TALLOC_FREE(state);
 708 }
 709
 710 /* Shutdown client connection which has been idle for the longest time */
 711
 712 static BOOL remove_idle_client(void)
 713 {
 714         struct winbindd_cli_state *state, *remove_state = NULL;
 715         time_t last_access = 0;
 716         int nidle = 0;
 717
 718         for (state = winbindd_client_list(); state; state = state->next) {
 719                 if (state->response.result != WINBINDD_PENDING &&
 720                     !state->getpwent_state && !state->getgrent_state) {
 721                         nidle++;
 722                         if (!last_access || state->last_access < last_access) {
 723                                 last_access = state->last_access;
 724                                 remove_state = state;
 725                         }
 726                 }
 727         }
 728
 729         if (remove_state) {
 730                 DEBUG(5,("Found %d idle client connections, shutting down sock %d, pid %u\n",
 731                         nidle, remove_state->sock, (unsigned int)remove_state->pid));
 732                 remove_client(remove_state);
 733                 return True;
 734         }
 735
 736         return False;
 737 }
 738
 739 /* check if HUP has been received and reload files */
 740 void winbind_check_sighup(const char *logfile)
 741 {
 742         if (do_sighup) {
 743
 744                 DEBUG(3, ("got SIGHUP\n"));
 745
 746                 msg_reload_services(MSG_SMB_CONF_UPDATED, pid_to_procid(0), NULL, 0, logfile);
 747                 do_sighup = False;
 748         }
 749 }
 750
 751 /* check if TERM has been received */
 752 void winbind_check_sigterm(bool in_parent)
 753 {
 754         if (do_sigterm)
 755                 terminate(in_parent);
 756 }
 757
 758 /* Process incoming clients on listen_sock.  We use a tricky non-blocking,
 759    non-forking, non-threaded model which allows us to handle many
 760    simultaneous connections while remaining impervious to many denial of
 761    service attacks. */
 762
 763 static void process_loop(void)
 764 {
 765         struct winbindd_cli_state *state;
 766         struct fd_event *ev;
 767         fd_set r_fds, w_fds;
 768         int maxfd, listen_sock, listen_priv_sock, selret;
 769         struct timeval timeout, ev_timeout;
 770
 771         /* Open Sockets here to get stuff going ASAP */
 772         listen_sock = open_winbindd_socket();
 773         listen_priv_sock = open_winbindd_priv_socket();
 774
 775         if (listen_sock == -1 || listen_priv_sock == -1) {
 776                 perror("open_winbind_socket");
 777                 exit(1);
 778         }
 779
 780         /* We'll be doing this a lot */
 781
 782         /* Handle messages */
 783
 784         message_dispatch();
 785
 786         run_events(winbind_event_context(), 0, NULL, NULL);
 787
 788         /* refresh the trusted domain cache */
 789
 790         rescan_trusted_domains();
 791
 792         /* Free up temporary memory */
 793
 794         lp_TALLOC_FREE();
 795         main_loop_TALLOC_FREE();
 796
 797         /* Initialise fd lists for select() */
 798
 799         maxfd = MAX(listen_sock, listen_priv_sock);
 800
 801         FD_ZERO(&r_fds);
 802         FD_ZERO(&w_fds);
 803         FD_SET(listen_sock, &r_fds);
 804         FD_SET(listen_priv_sock, &r_fds);
 805
 806         timeout.tv_sec = WINBINDD_ESTABLISH_LOOP;
 807         timeout.tv_usec = 0;
 808
 809         /* Check for any event timeouts. */
 810         if (get_timed_events_timeout(winbind_event_context(), &ev_timeout)) {
 811                 timeout = timeval_min(&timeout, &ev_timeout);
 812         }
 813
 814         /* Set up client readers and writers */
 815
 816         state = winbindd_client_list();
 817
 818         while (state) {
 819
 820                 struct winbindd_cli_state *next = state->next;
 821
 822                 /* Dispose of client connection if it is marked as
 823                    finished */
 824
 825                 if (state->finished)
 826                         remove_client(state);
 827
 828                 state = next;
 829         }
 830
 831         for (ev = fd_events; ev; ev = ev->next) {
 832                 if (ev->flags & EVENT_FD_READ) {
 833                         FD_SET(ev->fd, &r_fds);
 834                         maxfd = MAX(ev->fd, maxfd);
 835                 }
 836                 if (ev->flags & EVENT_FD_WRITE) {
 837                         FD_SET(ev->fd, &w_fds);
 838                         maxfd = MAX(ev->fd, maxfd);
 839                 }
 840         }
 841
 842         /* Call select */
 843
 844         selret = sys_select(maxfd + 1, &r_fds, &w_fds, NULL, &timeout);
 845
 846         if (selret == 0) {
 847                 goto no_fds_ready;
 848         }
 849
 850         if (selret == -1) {
 851                 if (errno == EINTR) {
 852                         goto no_fds_ready;
 853                 }
 854
 855                 /* Select error, something is badly wrong */
 856
 857                 perror("select");
 858                 exit(1);
 859         }
 860
 861         /* selret > 0 */
 862
 863         ev = fd_events;
 864         while (ev != NULL) {
 865                 struct fd_event *next = ev->next;
 866                 int flags = 0;
 867                 if (FD_ISSET(ev->fd, &r_fds))
 868                         flags |= EVENT_FD_READ;
 869                 if (FD_ISSET(ev->fd, &w_fds))
 870                         flags |= EVENT_FD_WRITE;
 871                 if (flags)
 872                         ev->handler(ev, flags);
 873                 ev = next;
 874         }
 875
 876         if (FD_ISSET(listen_sock, &r_fds)) {
 877                 while (winbindd_num_clients() >
 878                        WINBINDD_MAX_SIMULTANEOUS_CLIENTS - 1) {
 879                         DEBUG(5,("winbindd: Exceeding %d client "
 880                                  "connections, removing idle "
 881                                  "connection.\n",
 882                                  WINBINDD_MAX_SIMULTANEOUS_CLIENTS));
 883                         if (!remove_idle_client()) {
 884                                 DEBUG(0,("winbindd: Exceeding %d "
 885                                          "client connections, no idle "
 886                                          "connection found\n",
 887                                          WINBINDD_MAX_SIMULTANEOUS_CLIENTS));
 888                                 break;
 889                         }
 890                 }
 891                 /* new, non-privileged connection */
 892                 new_connection(listen_sock, False);
 893         }
 894
 895         if (FD_ISSET(listen_priv_sock, &r_fds)) {
 896                 while (winbindd_num_clients() >
 897                        WINBINDD_MAX_SIMULTANEOUS_CLIENTS - 1) {
 898                         DEBUG(5,("winbindd: Exceeding %d client "
 899                                  "connections, removing idle "
 900                                  "connection.\n",
 901                                  WINBINDD_MAX_SIMULTANEOUS_CLIENTS));
 902                         if (!remove_idle_client()) {
 903                                 DEBUG(0,("winbindd: Exceeding %d "
 904                                          "client connections, no idle "
 905                                          "connection found\n",
 906                                          WINBINDD_MAX_SIMULTANEOUS_CLIENTS));
 907                                 break;
 908                         }
 909                 }
 910                 /* new, privileged connection */
 911                 new_connection(listen_priv_sock, True);
 912         }
 913
 914  no_fds_ready:
 915
 916 #if 0
 917         winbindd_check_cache_size(time(NULL));
 918 #endif
 919
 920         /* Check signal handling things */
 921
 922         winbind_check_sigterm(true);
 923         winbind_check_sighup(NULL);
 924
 925         if (do_sigusr2) {
 926                 print_winbindd_status();
 927                 do_sigusr2 = False;
 928         }
 929
 930         if (do_sigchld) {
 931                 pid_t pid;
 932
 933                 do_sigchld = False;
 934
 935                 while ((pid = sys_waitpid(-1, NULL, WNOHANG)) > 0) {
 936                         winbind_child_died(pid);
 937                 }
 938         }
 939 }
 940
 941 /* Main function */
 942
 943 int main(int argc, char **argv, char **envp)
 944 {
 945         pstring logfile;
 946         static BOOL Fork = True;
 947         static BOOL log_stdout = False;
 948         static BOOL no_process_group = False;
 949         struct poptOption long_options[] = {
 950                 POPT_AUTOHELP
 951                 { "stdout", 'S', POPT_ARG_VAL, &log_stdout, True, "Log to stdout" },
 952                 { "foreground", 'F', POPT_ARG_VAL, &Fork, False, "Daemon in foreground mode" },
 953                 { "no-process-group", 0, POPT_ARG_VAL, &no_process_group, True, "Don't create a new process group" },
 954                 { "interactive", 'i', POPT_ARG_NONE, NULL, 'i', "Interactive mode" },
 955                 { "no-caching", 'n', POPT_ARG_VAL, &opt_nocache, True, "Disable caching" },
 956                 POPT_COMMON_SAMBA
 957                 POPT_TABLEEND
 958         };
 959         poptContext pc;
 960         int opt;
 961
 962         /* glibc (?) likes to print "User defined signal 1" and exit if a
 963            SIGUSR[12] is received before a handler is installed */
 964
 965         CatchSignal(SIGUSR1, SIG_IGN);
 966         CatchSignal(SIGUSR2, SIG_IGN);
 967
 968         fault_setup((void (*)(void *))fault_quit );
 969         dump_core_setup("winbindd");
 970
 971         load_case_tables();
 972
 973         /* Initialise for running in non-root mode */
 974
 975         sec_init();
 976
 977         set_remote_machine_name("winbindd", False);
 978
 979         /* Set environment variable so we don't recursively call ourselves.
 980            This may also be useful interactively. */
 981
 982         if ( !winbind_off() ) {
 983                 DEBUG(0,("Failed to disable recusive winbindd calls.  Exiting.\n"));
 984                 exit(1);
 985         }
 986
 987         /* Initialise samba/rpc client stuff */
 988
 989         pc = poptGetContext("winbindd", argc, (const char **)argv, long_options,
 990                                                 POPT_CONTEXT_KEEP_FIRST);
 991
 992         while ((opt = poptGetNextOpt(pc)) != -1) {
 993                 switch (opt) {
 994                         /* Don't become a daemon */
 995                 case 'i':
 996                         interactive = True;
 997                         log_stdout = True;
 998                         Fork = False;
 999                         break;
1000                 }
1001         }
1002
1003
1004         if (log_stdout && Fork) {
1005                 printf("Can't log to stdout (-S) unless daemon is in foreground +(-F) or interactive (-i)\n");
1006                 poptPrintUsage(pc, stderr, 0);
1007                 exit(1);
1008         }
1009
1010         if (!override_logfile) {
1011                 pstr_sprintf(logfile, "%s/log.winbindd", dyn_LOGFILEBASE);
1012                 lp_set_logfile(logfile);
1013         }
1014         setup_logging("winbindd", log_stdout);
1015         reopen_logs();
1016
1017         DEBUG(1, ("winbindd version %s started.\n%s\n",
1018                   SAMBA_VERSION_STRING,
1019                   COPYRIGHT_STARTUP_MESSAGE) );
1020
1021         if (!reload_services_file(NULL)) {
1022                 DEBUG(0, ("error opening config file\n"));
1023                 exit(1);
1024         }
1025
1026         if (!directory_exist(lp_lockdir(), NULL)) {
1027                 mkdir(lp_lockdir(), 0755);
1028         }
1029
1030         /* Setup names. */
1031
1032         if (!init_names())
1033                 exit(1);
1034
1035         load_interfaces();
1036
1037         if (!secrets_init()) {
1038
1039                 DEBUG(0,("Could not initialize domain trust account secrets. Giving up\n"));
1040                 return False;
1041         }
1042
1043         /* Enable netbios namecache */
1044
1045         namecache_enable();
1046
1047         /* Winbind daemon initialisation */
1048
1049         if ( ! NT_STATUS_IS_OK(idmap_init_cache()) ) {
1050                 DEBUG(1, ("Could not init idmap cache!\n"));
1051         }
1052
1053         /* Unblock all signals we are interested in as they may have been
1054            blocked by the parent process. */
1055
1056         BlockSignals(False, SIGINT);
1057         BlockSignals(False, SIGQUIT);
1058         BlockSignals(False, SIGTERM);
1059         BlockSignals(False, SIGUSR1);
1060         BlockSignals(False, SIGUSR2);
1061         BlockSignals(False, SIGHUP);
1062         BlockSignals(False, SIGCHLD);
1063
1064         /* Setup signal handlers */
1065
1066         CatchSignal(SIGINT, termination_handler);      /* Exit on these sigs */
1067         CatchSignal(SIGQUIT, termination_handler);
1068         CatchSignal(SIGTERM, termination_handler);
1069         CatchSignal(SIGCHLD, sigchld_handler);
1070
1071         CatchSignal(SIGPIPE, SIG_IGN);                 /* Ignore sigpipe */
1072
1073         CatchSignal(SIGUSR2, sigusr2_handler);         /* Debugging sigs */
1074         CatchSignal(SIGHUP, sighup_handler);
1075
1076         if (!interactive)
1077                 become_daemon(Fork, no_process_group);
1078
1079         pidfile_create("winbindd");
1080
1081 #if HAVE_SETPGID
1082         /*
1083          * If we're interactive we want to set our own process group for
1084          * signal management.
1085          */
1086         if (interactive && !no_process_group)
1087                 setpgid( (pid_t)0, (pid_t)0);
1088 #endif
1089
1090         TimeInit();
1091
1092         /* Initialise messaging system */
1093
1094         if (!message_init()) {
1095                 DEBUG(0, ("unable to initialize messaging system\n"));
1096                 exit(1);
1097         }
1098
1099         /* Initialize cache (ensure version is correct). */
1100         if (!initialize_winbindd_cache()) {
1101                 exit(1);
1102         }
1103
1104         /* React on 'smbcontrol winbindd reload-config' in the same way
1105            as to SIGHUP signal */
1106         message_register(MSG_SMB_CONF_UPDATED, msg_reload_services, NULL);
1107         message_register(MSG_SHUTDOWN, msg_shutdown, NULL);
1108
1109         /* Handle online/offline messages. */
1110         message_register(MSG_WINBIND_OFFLINE, winbind_msg_offline, NULL);
1111         message_register(MSG_WINBIND_ONLINE, winbind_msg_online, NULL);
1112         message_register(MSG_WINBIND_ONLINESTATUS, winbind_msg_onlinestatus,
1113                          NULL);
1114
1115         poptFreeContext(pc);
1116
1117         netsamlogon_cache_init(); /* Non-critical */
1118
1119         if (!init_domain_list()) {
1120                 DEBUG(0,("unable to initalize domain list\n"));
1121                 exit(1);
1122         }
1123
1124         init_idmap_child();
1125
1126         smb_nscd_flush_user_cache();
1127         smb_nscd_flush_group_cache();
1128
1129         /* Loop waiting for requests */
1130
1131         while (1)
1132                 process_loop();
1133
1134         return 0;
1135 }