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    Copyright (C) James Peach 2007
  11
  12    This program is free software; you can redistribute it and/or modify
  13    it under the terms of the GNU General Public License as published by
  14    the Free Software Foundation; either version 3 of the License, or
  15    (at your option) any later version.
  16
  17    This program is distributed in the hope that it will be useful,
  18    but WITHOUT ANY WARRANTY; without even the implied warranty of
  19    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  20    GNU General Public License for more details.
  21
  22    You should have received a copy of the GNU General Public License
  23    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  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
  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                 pstring fname;
  65
  66                 pstrcpy(fname,lp_configfile());
  67                 if (file_exist(fname,NULL) && !strcsequal(fname,dyn_CONFIGFILE)) {
  68                         pstrcpy(dyn_CONFIGFILE,fname);
  69                 }
  70         }
  71
  72         reopen_logs();
  73         ret = lp_load(dyn_CONFIGFILE,False,False,True,True);
  74
  75         reopen_logs();
  76         load_interfaces();
  77
  78         return(ret);
  79 }
  80
  81
  82 /**************************************************************************** **
  83  Handle a fault..
  84  **************************************************************************** */
  85
  86 static void fault_quit(void)
  87 {
  88         dump_core();
  89 }
  90
  91 static void winbindd_status(void)
  92 {
  93         struct winbindd_cli_state *tmp;
  94
  95         DEBUG(0, ("winbindd status:\n"));
  96
  97         /* Print client state information */
  98
  99         DEBUG(0, ("\t%d clients currently active\n", winbindd_num_clients()));
 100
 101         if (DEBUGLEVEL >= 2 && winbindd_num_clients()) {
 102                 DEBUG(2, ("\tclient list:\n"));
 103                 for(tmp = winbindd_client_list(); tmp; tmp = tmp->next) {
 104                         DEBUGADD(2, ("\t\tpid %lu, sock %d\n",
 105                                   (unsigned long)tmp->pid, tmp->sock));
 106                 }
 107         }
 108 }
 109
 110 /* Print winbindd status to log file */
 111
 112 static void print_winbindd_status(void)
 113 {
 114         winbindd_status();
 115 }
 116
 117 /* Flush client cache */
 118
 119 static void flush_caches(void)
 120 {
 121         /* We need to invalidate cached user list entries on a SIGHUP
 122            otherwise cached access denied errors due to restrict anonymous
 123            hang around until the sequence number changes. */
 124
 125         wcache_invalidate_cache();
 126 }
 127
 128 /* Handle the signal by unlinking socket and exiting */
 129
 130 static void terminate(void)
 131 {
 132
 133         winbindd_release_sockets();
 134         idmap_close();
 135
 136         trustdom_cache_shutdown();
 137
 138 #if 0
 139         if (interactive) {
 140                 TALLOC_CTX *mem_ctx = talloc_init("end_description");
 141                 char *description = talloc_describe_all(mem_ctx);
 142
 143                 DEBUG(3, ("tallocs left:\n%s\n", description));
 144                 talloc_destroy(mem_ctx);
 145         }
 146 #endif
 147
 148         exit(0);
 149 }
 150
 151 static BOOL do_sigterm;
 152
 153 static void termination_handler(int signum)
 154 {
 155         do_sigterm = True;
 156         sys_select_signal(signum);
 157 }
 158
 159 static BOOL do_sigusr2;
 160
 161 static void sigusr2_handler(int signum)
 162 {
 163         do_sigusr2 = True;
 164         sys_select_signal(SIGUSR2);
 165 }
 166
 167 static BOOL do_sighup;
 168
 169 static void sighup_handler(int signum)
 170 {
 171         do_sighup = True;
 172         sys_select_signal(SIGHUP);
 173 }
 174
 175 static BOOL do_sigchld;
 176
 177 static void sigchld_handler(int signum)
 178 {
 179         do_sigchld = True;
 180         sys_select_signal(SIGCHLD);
 181 }
 182
 183 /* React on 'smbcontrol winbindd reload-config' in the same way as on SIGHUP*/
 184 static void msg_reload_services(struct messaging_context *msg,
 185                                 void *private_data,
 186                                 uint32_t msg_type,
 187                                 struct server_id server_id,
 188                                 DATA_BLOB *data)
 189 {
 190         /* Flush various caches */
 191         flush_caches();
 192         reload_services_file();
 193 }
 194
 195 /* React on 'smbcontrol winbindd shutdown' in the same way as on SIGTERM*/
 196 static void msg_shutdown(struct messaging_context *msg,
 197                          void *private_data,
 198                          uint32_t msg_type,
 199                          struct server_id server_id,
 200                          DATA_BLOB *data)
 201 {
 202         do_sigterm = True;
 203 }
 204
 205 static struct winbindd_dispatch_table {
 206         enum winbindd_cmd cmd;
 207         void (*fn)(struct winbindd_cli_state *state);
 208         const char *winbindd_cmd_name;
 209 } dispatch_table[] = {
 210
 211         /* User functions */
 212
 213         { WINBINDD_GETPWNAM, winbindd_getpwnam, "GETPWNAM" },
 214         { WINBINDD_GETPWUID, winbindd_getpwuid, "GETPWUID" },
 215
 216         { WINBINDD_SETPWENT, winbindd_setpwent, "SETPWENT" },
 217         { WINBINDD_ENDPWENT, winbindd_endpwent, "ENDPWENT" },
 218         { WINBINDD_GETPWENT, winbindd_getpwent, "GETPWENT" },
 219
 220         { WINBINDD_GETGROUPS, winbindd_getgroups, "GETGROUPS" },
 221         { WINBINDD_GETUSERSIDS, winbindd_getusersids, "GETUSERSIDS" },
 222         { WINBINDD_GETUSERDOMGROUPS, winbindd_getuserdomgroups,
 223           "GETUSERDOMGROUPS" },
 224
 225         /* Group functions */
 226
 227         { WINBINDD_GETGRNAM, winbindd_getgrnam, "GETGRNAM" },
 228         { WINBINDD_GETGRGID, winbindd_getgrgid, "GETGRGID" },
 229         { WINBINDD_SETGRENT, winbindd_setgrent, "SETGRENT" },
 230         { WINBINDD_ENDGRENT, winbindd_endgrent, "ENDGRENT" },
 231         { WINBINDD_GETGRENT, winbindd_getgrent, "GETGRENT" },
 232         { WINBINDD_GETGRLST, winbindd_getgrent, "GETGRLST" },
 233
 234         /* PAM auth functions */
 235
 236         { WINBINDD_PAM_AUTH, winbindd_pam_auth, "PAM_AUTH" },
 237         { WINBINDD_PAM_AUTH_CRAP, winbindd_pam_auth_crap, "AUTH_CRAP" },
 238         { WINBINDD_PAM_CHAUTHTOK, winbindd_pam_chauthtok, "CHAUTHTOK" },
 239         { WINBINDD_PAM_LOGOFF, winbindd_pam_logoff, "PAM_LOGOFF" },
 240         { WINBINDD_PAM_CHNG_PSWD_AUTH_CRAP, winbindd_pam_chng_pswd_auth_crap, "CHNG_PSWD_AUTH_CRAP" },
 241
 242         /* Enumeration functions */
 243
 244         { WINBINDD_LIST_USERS, winbindd_list_users, "LIST_USERS" },
 245         { WINBINDD_LIST_GROUPS, winbindd_list_groups, "LIST_GROUPS" },
 246         { WINBINDD_LIST_TRUSTDOM, winbindd_list_trusted_domains,
 247           "LIST_TRUSTDOM" },
 248         { WINBINDD_SHOW_SEQUENCE, winbindd_show_sequence, "SHOW_SEQUENCE" },
 249
 250         /* SID related functions */
 251
 252         { WINBINDD_LOOKUPSID, winbindd_lookupsid, "LOOKUPSID" },
 253         { WINBINDD_LOOKUPNAME, winbindd_lookupname, "LOOKUPNAME" },
 254         { WINBINDD_LOOKUPRIDS, winbindd_lookuprids, "LOOKUPRIDS" },
 255
 256         /* Lookup related functions */
 257
 258         { WINBINDD_SID_TO_UID, winbindd_sid_to_uid, "SID_TO_UID" },
 259         { WINBINDD_SID_TO_GID, winbindd_sid_to_gid, "SID_TO_GID" },
 260         { WINBINDD_UID_TO_SID, winbindd_uid_to_sid, "UID_TO_SID" },
 261         { WINBINDD_GID_TO_SID, winbindd_gid_to_sid, "GID_TO_SID" },
 262 #if 0   /* DISABLED until we fix the interface in Samba 3.0.26 --jerry */
 263         { WINBINDD_SIDS_TO_XIDS, winbindd_sids_to_unixids, "SIDS_TO_XIDS" },
 264 #endif  /* end DISABLED */
 265         { WINBINDD_ALLOCATE_UID, winbindd_allocate_uid, "ALLOCATE_UID" },
 266         { WINBINDD_ALLOCATE_GID, winbindd_allocate_gid, "ALLOCATE_GID" },
 267         { WINBINDD_SET_MAPPING, winbindd_set_mapping, "SET_MAPPING" },
 268         { WINBINDD_SET_HWM, winbindd_set_hwm, "SET_HWMS" },
 269
 270         /* Miscellaneous */
 271
 272         { WINBINDD_DUMP_MAPS, winbindd_dump_maps, "DUMP_MAPS" },
 273
 274         { WINBINDD_CHECK_MACHACC, winbindd_check_machine_acct, "CHECK_MACHACC" },
 275         { WINBINDD_PING, winbindd_ping, "PING" },
 276         { WINBINDD_INFO, winbindd_info, "INFO" },
 277         { WINBINDD_INTERFACE_VERSION, winbindd_interface_version,
 278           "INTERFACE_VERSION" },
 279         { WINBINDD_DOMAIN_NAME, winbindd_domain_name, "DOMAIN_NAME" },
 280         { WINBINDD_DOMAIN_INFO, winbindd_domain_info, "DOMAIN_INFO" },
 281         { WINBINDD_NETBIOS_NAME, winbindd_netbios_name, "NETBIOS_NAME" },
 282         { WINBINDD_PRIV_PIPE_DIR, winbindd_priv_pipe_dir,
 283           "WINBINDD_PRIV_PIPE_DIR" },
 284         { WINBINDD_GETDCNAME, winbindd_getdcname, "GETDCNAME" },
 285
 286         /* Credential cache access */
 287         { WINBINDD_CCACHE_NTLMAUTH, winbindd_ccache_ntlm_auth, "NTLMAUTH" },
 288
 289         /* WINS functions */
 290
 291         { WINBINDD_WINS_BYNAME, winbindd_wins_byname, "WINS_BYNAME" },
 292         { WINBINDD_WINS_BYIP, winbindd_wins_byip, "WINS_BYIP" },
 293
 294         /* End of list */
 295
 296         { WINBINDD_NUM_CMDS, NULL, "NONE" }
 297 };
 298
 299 static void process_request(struct winbindd_cli_state *state)
 300 {
 301         struct winbindd_dispatch_table *table = dispatch_table;
 302
 303         /* Free response data - we may be interrupted and receive another
 304            command before being able to send this data off. */
 305
 306         SAFE_FREE(state->response.extra_data.data);
 307
 308         ZERO_STRUCT(state->response);
 309
 310         state->response.result = WINBINDD_PENDING;
 311         state->response.length = sizeof(struct winbindd_response);
 312
 313         state->mem_ctx = talloc_init("winbind request");
 314         if (state->mem_ctx == NULL)
 315                 return;
 316
 317         /* Remember who asked us. */
 318         state->pid = state->request.pid;
 319
 320         /* Process command */
 321
 322         for (table = dispatch_table; table->fn; table++) {
 323                 if (state->request.cmd == table->cmd) {
 324                         DEBUG(10,("process_request: request fn %s\n",
 325                                   table->winbindd_cmd_name ));
 326                         table->fn(state);
 327                         break;
 328                 }
 329         }
 330
 331         if (!table->fn) {
 332                 DEBUG(10,("process_request: unknown request fn number %d\n",
 333                           (int)state->request.cmd ));
 334                 request_error(state);
 335         }
 336 }
 337
 338 /*
 339  * A list of file descriptors being monitored by select in the main processing
 340  * loop. fd_event->handler is called whenever the socket is readable/writable.
 341  */
 342
 343 static struct fd_event *fd_events = NULL;
 344
 345 void add_fd_event(struct fd_event *ev)
 346 {
 347         struct fd_event *match;
 348
 349         /* only add unique fd_event structs */
 350
 351         for (match=fd_events; match; match=match->next ) {
 352 #ifdef DEVELOPER
 353                 SMB_ASSERT( match != ev );
 354 #else
 355                 if ( match == ev )
 356                         return;
 357 #endif
 358         }
 359
 360         DLIST_ADD(fd_events, ev);
 361 }
 362
 363 void remove_fd_event(struct fd_event *ev)
 364 {
 365         DLIST_REMOVE(fd_events, ev);
 366 }
 367
 368 /*
 369  * Handler for fd_events to complete a read/write request, set up by
 370  * setup_async_read/setup_async_write.
 371  */
 372
 373 static void rw_callback(struct fd_event *event, int flags)
 374 {
 375         size_t todo;
 376         ssize_t done = 0;
 377
 378         todo = event->length - event->done;
 379
 380         if (event->flags & EVENT_FD_WRITE) {
 381                 SMB_ASSERT(flags == EVENT_FD_WRITE);
 382                 done = sys_write(event->fd,
 383                                  &((char *)event->data)[event->done],
 384                                  todo);
 385
 386                 if (done <= 0) {
 387                         event->flags = 0;
 388                         event->finished(event->private_data, False);
 389                         return;
 390                 }
 391         }
 392
 393         if (event->flags & EVENT_FD_READ) {
 394                 SMB_ASSERT(flags == EVENT_FD_READ);
 395                 done = sys_read(event->fd, &((char *)event->data)[event->done],
 396                                 todo);
 397
 398                 if (done <= 0) {
 399                         event->flags = 0;
 400                         event->finished(event->private_data, False);
 401                         return;
 402                 }
 403         }
 404
 405         event->done += done;
 406
 407         if (event->done == event->length) {
 408                 event->flags = 0;
 409                 event->finished(event->private_data, True);
 410         }
 411 }
 412
 413 /*
 414  * Request an async read/write on a fd_event structure. (*finished) is called
 415  * when the request is completed or an error had occurred.
 416  */
 417
 418 void setup_async_read(struct fd_event *event, void *data, size_t length,
 419                       void (*finished)(void *private_data, BOOL success),
 420                       void *private_data)
 421 {
 422         SMB_ASSERT(event->flags == 0);
 423         event->data = data;
 424         event->length = length;
 425         event->done = 0;
 426         event->handler = rw_callback;
 427         event->finished = finished;
 428         event->private_data = private_data;
 429         event->flags = EVENT_FD_READ;
 430 }
 431
 432 void setup_async_write(struct fd_event *event, void *data, size_t length,
 433                        void (*finished)(void *private_data, BOOL success),
 434                        void *private_data)
 435 {
 436         SMB_ASSERT(event->flags == 0);
 437         event->data = data;
 438         event->length = length;
 439         event->done = 0;
 440         event->handler = rw_callback;
 441         event->finished = finished;
 442         event->private_data = private_data;
 443         event->flags = EVENT_FD_WRITE;
 444 }
 445
 446 /*
 447  * This is the main event loop of winbind requests. It goes through a
 448  * state-machine of 3 read/write requests, 4 if you have extra data to send.
 449  *
 450  * An idle winbind client has a read request of 4 bytes outstanding,
 451  * finalizing function is request_len_recv, checking the length. request_recv
 452  * then processes the packet. The processing function then at some point has
 453  * to call request_finished which schedules sending the response.
 454  */
 455
 456 static void request_len_recv(void *private_data, BOOL success);
 457 static void request_recv(void *private_data, BOOL success);
 458 static void request_main_recv(void *private_data, BOOL success);
 459 static void request_finished(struct winbindd_cli_state *state);
 460 void request_finished_cont(void *private_data, BOOL success);
 461 static void response_main_sent(void *private_data, BOOL success);
 462 static void response_extra_sent(void *private_data, BOOL success);
 463
 464 static void response_extra_sent(void *private_data, BOOL success)
 465 {
 466         struct winbindd_cli_state *state =
 467                 talloc_get_type_abort(private_data, struct winbindd_cli_state);
 468
 469         if (state->mem_ctx != NULL) {
 470                 talloc_destroy(state->mem_ctx);
 471                 state->mem_ctx = NULL;
 472         }
 473
 474         if (!success) {
 475                 state->finished = True;
 476                 return;
 477         }
 478
 479         SAFE_FREE(state->request.extra_data.data);
 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         setup_async_write(&state->fd_event, &state->response,
 515                           sizeof(state->response), response_main_sent, state);
 516 }
 517
 518 void request_error(struct winbindd_cli_state *state)
 519 {
 520         SMB_ASSERT(state->response.result == WINBINDD_PENDING);
 521         state->response.result = WINBINDD_ERROR;
 522         request_finished(state);
 523 }
 524
 525 void request_ok(struct winbindd_cli_state *state)
 526 {
 527         SMB_ASSERT(state->response.result == WINBINDD_PENDING);
 528         state->response.result = WINBINDD_OK;
 529         request_finished(state);
 530 }
 531
 532 void request_finished_cont(void *private_data, BOOL success)
 533 {
 534         struct winbindd_cli_state *state =
 535                 talloc_get_type_abort(private_data, struct winbindd_cli_state);
 536
 537         if (success)
 538                 request_ok(state);
 539         else
 540                 request_error(state);
 541 }
 542
 543 static void request_len_recv(void *private_data, BOOL success)
 544 {
 545         struct winbindd_cli_state *state =
 546                 talloc_get_type_abort(private_data, struct winbindd_cli_state);
 547
 548         if (!success) {
 549                 state->finished = True;
 550                 return;
 551         }
 552
 553         if (*(uint32 *)(&state->request) != sizeof(state->request)) {
 554                 DEBUG(0,("request_len_recv: Invalid request size received: %d\n",
 555                          *(uint32 *)(&state->request)));
 556                 state->finished = True;
 557                 return;
 558         }
 559
 560         setup_async_read(&state->fd_event, (uint32 *)(&state->request)+1,
 561                          sizeof(state->request) - sizeof(uint32),
 562                          request_main_recv, state);
 563 }
 564
 565 static void request_main_recv(void *private_data, BOOL success)
 566 {
 567         struct winbindd_cli_state *state =
 568                 talloc_get_type_abort(private_data, struct winbindd_cli_state);
 569
 570         if (!success) {
 571                 state->finished = True;
 572                 return;
 573         }
 574
 575         if (state->request.extra_len == 0) {
 576                 state->request.extra_data.data = NULL;
 577                 request_recv(state, True);
 578                 return;
 579         }
 580
 581         if ((!state->privileged) &&
 582             (state->request.extra_len > WINBINDD_MAX_EXTRA_DATA)) {
 583                 DEBUG(3, ("Got request with %d bytes extra data on "
 584                           "unprivileged socket\n", (int)state->request.extra_len));
 585                 state->request.extra_data.data = NULL;
 586                 state->finished = True;
 587                 return;
 588         }
 589
 590         state->request.extra_data.data =
 591                 SMB_MALLOC_ARRAY(char, state->request.extra_len + 1);
 592
 593         if (state->request.extra_data.data == NULL) {
 594                 DEBUG(0, ("malloc failed\n"));
 595                 state->finished = True;
 596                 return;
 597         }
 598
 599         /* Ensure null termination */
 600         state->request.extra_data.data[state->request.extra_len] = '\0';
 601
 602         setup_async_read(&state->fd_event, state->request.extra_data.data,
 603                          state->request.extra_len, request_recv, state);
 604 }
 605
 606 static void request_recv(void *private_data, BOOL success)
 607 {
 608         struct winbindd_cli_state *state =
 609                 talloc_get_type_abort(private_data, struct winbindd_cli_state);
 610
 611         if (!success) {
 612                 state->finished = True;
 613                 return;
 614         }
 615
 616         process_request(state);
 617 }
 618
 619 /* Process a new connection by adding it to the client connection list */
 620
 621 static void new_connection(int listen_sock, BOOL privileged)
 622 {
 623         struct sockaddr_un sunaddr;
 624         struct winbindd_cli_state *state;
 625         socklen_t len;
 626         int sock;
 627
 628         /* Accept connection */
 629
 630         len = sizeof(sunaddr);
 631
 632         do {
 633                 sock = accept(listen_sock, (struct sockaddr *)&sunaddr, &len);
 634         } while (sock == -1 && errno == EINTR);
 635
 636         if (sock == -1)
 637                 return;
 638
 639         DEBUG(6,("accepted socket %d\n", sock));
 640
 641         /* Create new connection structure */
 642
 643         if ((state = TALLOC_ZERO_P(NULL, struct winbindd_cli_state)) == NULL) {
 644                 close(sock);
 645                 return;
 646         }
 647
 648         state->sock = sock;
 649
 650         state->last_access = time(NULL);
 651
 652         state->privileged = privileged;
 653
 654         state->fd_event.fd = state->sock;
 655         state->fd_event.flags = 0;
 656         add_fd_event(&state->fd_event);
 657
 658         setup_async_read(&state->fd_event, &state->request, sizeof(uint32),
 659                          request_len_recv, state);
 660
 661         /* Add to connection list */
 662
 663         winbindd_add_client(state);
 664 }
 665
 666 /* Remove a client connection from client connection list */
 667
 668 static void remove_client(struct winbindd_cli_state *state)
 669 {
 670         /* It's a dead client - hold a funeral */
 671
 672         if (state == NULL) {
 673                 return;
 674         }
 675
 676         /* Close socket */
 677
 678         close(state->sock);
 679
 680         /* Free any getent state */
 681
 682         free_getent_state(state->getpwent_state);
 683         free_getent_state(state->getgrent_state);
 684
 685         /* We may have some extra data that was not freed if the client was
 686            killed unexpectedly */
 687
 688         SAFE_FREE(state->response.extra_data.data);
 689
 690         if (state->mem_ctx != NULL) {
 691                 talloc_destroy(state->mem_ctx);
 692                 state->mem_ctx = NULL;
 693         }
 694
 695         remove_fd_event(&state->fd_event);
 696
 697         /* Remove from list and free */
 698
 699         winbindd_remove_client(state);
 700         TALLOC_FREE(state);
 701 }
 702
 703 /* Shutdown client connection which has been idle for the longest time */
 704
 705 static BOOL remove_idle_client(void)
 706 {
 707         struct winbindd_cli_state *state, *remove_state = NULL;
 708         time_t last_access = 0;
 709         int nidle = 0;
 710
 711         for (state = winbindd_client_list(); state; state = state->next) {
 712                 if (state->response.result != WINBINDD_PENDING &&
 713                     !state->getpwent_state && !state->getgrent_state) {
 714                         nidle++;
 715                         if (!last_access || state->last_access < last_access) {
 716                                 last_access = state->last_access;
 717                                 remove_state = state;
 718                         }
 719                 }
 720         }
 721
 722         if (remove_state) {
 723                 DEBUG(5,("Found %d idle client connections, shutting down sock %d, pid %u\n",
 724                         nidle, remove_state->sock, (unsigned int)remove_state->pid));
 725                 remove_client(remove_state);
 726                 return True;
 727         }
 728
 729         return False;
 730 }
 731
 732 /* Process incoming clients on listen_sock.  We use a tricky non-blocking,
 733    non-forking, non-threaded model which allows us to handle many
 734    simultaneous connections while remaining impervious to many denial of
 735    service attacks. */
 736
 737 static int process_loop(int listen_sock, int listen_priv_sock)
 738 {
 739         struct winbindd_cli_state *state;
 740         struct fd_event *ev;
 741         fd_set r_fds, w_fds;
 742         int maxfd, selret;
 743         struct timeval timeout, ev_timeout;
 744
 745         /* We'll be doing this a lot */
 746
 747         /* Handle messages */
 748
 749         message_dispatch(winbind_messaging_context());
 750
 751         run_events(winbind_event_context(), 0, NULL, NULL);
 752
 753         /* refresh the trusted domain cache */
 754
 755         rescan_trusted_domains();
 756
 757         /* Free up temporary memory */
 758
 759         lp_TALLOC_FREE();
 760         main_loop_TALLOC_FREE();
 761
 762         /* Initialise fd lists for select() */
 763
 764         maxfd = MAX(listen_sock, listen_priv_sock);
 765
 766         FD_ZERO(&r_fds);
 767         FD_ZERO(&w_fds);
 768         FD_SET(listen_sock, &r_fds);
 769         FD_SET(listen_priv_sock, &r_fds);
 770
 771         timeout.tv_sec = WINBINDD_ESTABLISH_LOOP;
 772         timeout.tv_usec = 0;
 773
 774         /* Check for any event timeouts. */
 775         if (get_timed_events_timeout(winbind_event_context(), &ev_timeout)) {
 776                 timeout = timeval_min(&timeout, &ev_timeout);
 777         }
 778
 779         /* Set up client readers and writers */
 780
 781         state = winbindd_client_list();
 782
 783         while (state) {
 784
 785                 struct winbindd_cli_state *next = state->next;
 786
 787                 /* Dispose of client connection if it is marked as
 788                    finished */
 789
 790                 if (state->finished)
 791                         remove_client(state);
 792
 793                 state = next;
 794         }
 795
 796         for (ev = fd_events; ev; ev = ev->next) {
 797                 if (ev->flags & EVENT_FD_READ) {
 798                         FD_SET(ev->fd, &r_fds);
 799                         maxfd = MAX(ev->fd, maxfd);
 800                 }
 801                 if (ev->flags & EVENT_FD_WRITE) {
 802                         FD_SET(ev->fd, &w_fds);
 803                         maxfd = MAX(ev->fd, maxfd);
 804                 }
 805         }
 806
 807         /* Call select */
 808
 809         selret = sys_select(maxfd + 1, &r_fds, &w_fds, NULL, &timeout);
 810
 811         if (selret == 0) {
 812                 goto no_fds_ready;
 813         }
 814
 815         if (selret == -1) {
 816                 if (errno == EINTR) {
 817                         goto no_fds_ready;
 818                 }
 819
 820                 /* Select error, something is badly wrong */
 821
 822                 perror("select");
 823                 exit(1);
 824         }
 825
 826         /* selret > 0 */
 827
 828         ev = fd_events;
 829         while (ev != NULL) {
 830                 struct fd_event *next = ev->next;
 831                 int flags = 0;
 832                 if (FD_ISSET(ev->fd, &r_fds))
 833                         flags |= EVENT_FD_READ;
 834                 if (FD_ISSET(ev->fd, &w_fds))
 835                         flags |= EVENT_FD_WRITE;
 836                 if (flags)
 837                         ev->handler(ev, flags);
 838                 ev = next;
 839         }
 840
 841         if (FD_ISSET(listen_sock, &r_fds)) {
 842                 while (winbindd_num_clients() >
 843                        WINBINDD_MAX_SIMULTANEOUS_CLIENTS - 1) {
 844                         DEBUG(5,("winbindd: Exceeding %d client "
 845                                  "connections, removing idle "
 846                                  "connection.\n",
 847                                  WINBINDD_MAX_SIMULTANEOUS_CLIENTS));
 848                         if (!remove_idle_client()) {
 849                                 DEBUG(0,("winbindd: Exceeding %d "
 850                                          "client connections, no idle "
 851                                          "connection found\n",
 852                                          WINBINDD_MAX_SIMULTANEOUS_CLIENTS));
 853                                 break;
 854                         }
 855                 }
 856                 /* new, non-privileged connection */
 857                 new_connection(listen_sock, False);
 858         }
 859
 860         if (FD_ISSET(listen_priv_sock, &r_fds)) {
 861                 while (winbindd_num_clients() >
 862                        WINBINDD_MAX_SIMULTANEOUS_CLIENTS - 1) {
 863                         DEBUG(5,("winbindd: Exceeding %d client "
 864                                  "connections, removing idle "
 865                                  "connection.\n",
 866                                  WINBINDD_MAX_SIMULTANEOUS_CLIENTS));
 867                         if (!remove_idle_client()) {
 868                                 DEBUG(0,("winbindd: Exceeding %d "
 869                                          "client connections, no idle "
 870                                          "connection found\n",
 871                                          WINBINDD_MAX_SIMULTANEOUS_CLIENTS));
 872                                 break;
 873                         }
 874                 }
 875                 /* new, privileged connection */
 876                 new_connection(listen_priv_sock, True);
 877         }
 878
 879  no_fds_ready:
 880
 881 #if 0
 882         winbindd_check_cache_size(time(NULL));
 883 #endif
 884
 885         /* Check signal handling things */
 886
 887         if (do_sigterm)
 888                 terminate();
 889
 890         if (do_sighup) {
 891
 892                 DEBUG(3, ("got SIGHUP\n"));
 893
 894                 flush_caches();
 895                 reload_services_file();
 896
 897                 do_sighup = False;
 898         }
 899
 900         if (do_sigusr2) {
 901                 print_winbindd_status();
 902                 do_sigusr2 = False;
 903         }
 904
 905         if (do_sigchld) {
 906                 pid_t pid;
 907
 908                 do_sigchld = False;
 909
 910                 while ((pid = sys_waitpid(-1, NULL, WNOHANG)) > 0) {
 911                         winbind_child_died(pid);
 912                 }
 913         }
 914
 915
 916         return winbindd_num_clients();
 917 }
 918
 919 static void winbindd_process_loop(enum smb_server_mode server_mode)
 920 {
 921         int idle_timeout_sec;
 922         struct timeval starttime;
 923         int listen_public, listen_priv;
 924
 925         errno = 0;
 926         if (!winbindd_init_sockets(&listen_public, &listen_priv,
 927                                     &idle_timeout_sec)) {
 928                 terminate();
 929         }
 930
 931         starttime = timeval_current();
 932
 933         if (listen_public == -1 || listen_priv == -1) {
 934                 DEBUG(0, ("failed to open winbindd pipes: %s\n",
 935                             errno ? strerror(errno) : "unknown error"));
 936                 terminate();
 937         }
 938
 939         for (;;) {
 940                 int clients = process_loop(listen_public, listen_priv);
 941
 942                 /* Don't bother figuring out the idle time if we won't be
 943                  * timing out anyway.
 944                  */
 945                 if (idle_timeout_sec < 0) {
 946                         continue;
 947                 }
 948
 949                 if (clients == 0 && server_mode == SERVER_MODE_FOREGROUND) {
 950                         struct timeval now;
 951
 952                         now = timeval_current();
 953                         if (timeval_elapsed2(&starttime, &now) >
 954                                 (double)idle_timeout_sec) {
 955                                 DEBUG(0, ("idle for %d secs, exitting\n",
 956                                             idle_timeout_sec));
 957                                 terminate();
 958                         }
 959                 } else {
 960                         starttime = timeval_current();
 961                 }
 962         }
 963 }
 964
 965 /* Main function */
 966
 967 int main(int argc, char **argv, char **envp)
 968 {
 969         pstring logfile;
 970         BOOL log_stdout = False;
 971         BOOL no_process_group = False;
 972
 973         enum smb_server_mode server_mode = SERVER_MODE_DAEMON;
 974
 975         struct poptOption long_options[] = {
 976                 POPT_AUTOHELP
 977                 { "stdout", 'S', POPT_ARG_VAL, &log_stdout, True, "Log to stdout" },
 978                 { "foreground", 'F', POPT_ARG_VAL, &server_mode, SERVER_MODE_FOREGROUND, "Daemon in foreground mode" },
 979                 { "no-process-group", 0, POPT_ARG_VAL, &no_process_group, True, "Don't create a new process group" },
 980                 { "interactive", 'i', POPT_ARG_VAL, &server_mode, SERVER_MODE_INTERACTIVE, "Interactive mode" },
 981                 { "no-caching", 'n', POPT_ARG_VAL, &opt_nocache, True, "Disable caching" },
 982                 POPT_COMMON_SAMBA
 983                 POPT_TABLEEND
 984         };
 985         poptContext pc;
 986         int opt;
 987
 988         /* glibc (?) likes to print "User defined signal 1" and exit if a
 989            SIGUSR[12] is received before a handler is installed */
 990
 991         CatchSignal(SIGUSR1, SIG_IGN);
 992         CatchSignal(SIGUSR2, SIG_IGN);
 993
 994         fault_setup((void (*)(void *))fault_quit );
 995         dump_core_setup("winbindd");
 996
 997         load_case_tables();
 998
 999         /* Initialise for running in non-root mode */
1000
1001         sec_init();
1002
1003         set_remote_machine_name("winbindd", False);
1004
1005         /* Set environment variable so we don't recursively call ourselves.
1006            This may also be useful interactively. */
1007
1008         if ( !winbind_off() ) {
1009                 DEBUG(0,("Failed to disable recusive winbindd calls.  Exiting.\n"));
1010                 exit(1);
1011         }
1012
1013         /* Initialise samba/rpc client stuff */
1014
1015         pc = poptGetContext("winbindd", argc, (const char **)argv, long_options,
1016                                                 POPT_CONTEXT_KEEP_FIRST);
1017
1018         while ((opt = poptGetNextOpt(pc)) != -1) {}
1019
1020         if (server_mode == SERVER_MODE_INTERACTIVE) {
1021                 log_stdout = True;
1022                 if (DEBUGLEVEL >= 9) {
1023                         talloc_enable_leak_report();
1024                 }
1025         }
1026
1027         if (log_stdout && server_mode == SERVER_MODE_DAEMON) {
1028                 printf("Can't log to stdout (-S) unless daemon is in foreground (-F) or interactive (-i)\n");
1029                 poptPrintUsage(pc, stderr, 0);
1030                 exit(1);
1031         }
1032
1033         if (!override_logfile) {
1034                 pstr_sprintf(logfile, "%s/log.winbindd", dyn_LOGFILEBASE);
1035                 lp_set_logfile(logfile);
1036         }
1037         setup_logging("winbindd", log_stdout);
1038         reopen_logs();
1039
1040         DEBUG(1, ("winbindd version %s started.\n%s\n",
1041                   SAMBA_VERSION_STRING,
1042                   COPYRIGHT_STARTUP_MESSAGE) );
1043
1044         if (!reload_services_file()) {
1045                 DEBUG(0, ("error opening config file\n"));
1046                 exit(1);
1047         }
1048
1049         if (!directory_exist(lp_lockdir(), NULL)) {
1050                 mkdir(lp_lockdir(), 0755);
1051         }
1052
1053         /* Setup names. */
1054
1055         if (!init_names())
1056                 exit(1);
1057
1058         load_interfaces();
1059
1060         if (!secrets_init()) {
1061
1062                 DEBUG(0,("Could not initialize domain trust account secrets. Giving up\n"));
1063                 return False;
1064         }
1065
1066         /* Enable netbios namecache */
1067
1068         namecache_enable();
1069
1070         /* Winbind daemon initialisation */
1071
1072         if ( ! NT_STATUS_IS_OK(idmap_init_cache()) ) {
1073                 DEBUG(1, ("Could not init idmap cache!\n"));
1074         }
1075
1076         /* Unblock all signals we are interested in as they may have been
1077            blocked by the parent process. */
1078
1079         BlockSignals(False, SIGINT);
1080         BlockSignals(False, SIGQUIT);
1081         BlockSignals(False, SIGTERM);
1082         BlockSignals(False, SIGUSR1);
1083         BlockSignals(False, SIGUSR2);
1084         BlockSignals(False, SIGHUP);
1085         BlockSignals(False, SIGCHLD);
1086
1087         /* Setup signal handlers */
1088
1089         CatchSignal(SIGINT, termination_handler);      /* Exit on these sigs */
1090         CatchSignal(SIGQUIT, termination_handler);
1091         CatchSignal(SIGTERM, termination_handler);
1092         CatchSignal(SIGCHLD, sigchld_handler);
1093
1094         CatchSignal(SIGPIPE, SIG_IGN);                 /* Ignore sigpipe */
1095
1096         CatchSignal(SIGUSR2, sigusr2_handler);         /* Debugging sigs */
1097         CatchSignal(SIGHUP, sighup_handler);
1098
1099         if (server_mode == SERVER_MODE_DAEMON) {
1100                 DEBUG( 3, ( "Becoming a daemon.\n" ) );
1101                 become_daemon(True, no_process_group);
1102         } else if (server_mode == SERVER_MODE_FOREGROUND) {
1103                 become_daemon(False, no_process_group);
1104         }
1105
1106         pidfile_create("winbindd");
1107
1108         /* Ensure all cache and idmap caches are consistent
1109            before we startup. */
1110
1111         if (winbindd_validate_cache()) {
1112                 /* We have a bad cache, but luckily we
1113                    just deleted it. Restart ourselves */
1114                 int i;
1115                 /* Ensure we have no open low fd's. */
1116                 for (i = 3; i < 100; i++) {
1117                         close(i);
1118                 }
1119                 return execve(argv[0], argv, envp);
1120         }
1121
1122 #if HAVE_SETPGID
1123         /*
1124          * If we're interactive we want to set our own process group for
1125          * signal management.
1126          */
1127         if (server_mode == SERVER_MODE_INTERACTIVE && !no_process_group) {
1128                 setpgid( (pid_t)0, (pid_t)0);
1129         }
1130 #endif
1131
1132         TimeInit();
1133
1134         /* Initialise messaging system */
1135
1136         if (winbind_messaging_context() == NULL) {
1137                 DEBUG(0, ("unable to initialize messaging system\n"));
1138                 exit(1);
1139         }
1140
1141         /* Initialize cache (ensure version is correct). */
1142         if (!initialize_winbindd_cache()) {
1143                 exit(1);
1144         }
1145
1146         /* React on 'smbcontrol winbindd reload-config' in the same way
1147            as to SIGHUP signal */
1148         messaging_register(winbind_messaging_context(), NULL,
1149                            MSG_SMB_CONF_UPDATED, msg_reload_services);
1150         messaging_register(winbind_messaging_context(), NULL,
1151                            MSG_SHUTDOWN, msg_shutdown);
1152
1153         /* Handle online/offline messages. */
1154         messaging_register(winbind_messaging_context(), NULL,
1155                            MSG_WINBIND_OFFLINE, winbind_msg_offline);
1156         messaging_register(winbind_messaging_context(), NULL,
1157                            MSG_WINBIND_ONLINE, winbind_msg_online);
1158         messaging_register(winbind_messaging_context(), NULL,
1159                            MSG_WINBIND_ONLINESTATUS, winbind_msg_onlinestatus);
1160
1161         messaging_register(winbind_messaging_context(), NULL,
1162                            MSG_DUMP_EVENT_LIST, winbind_msg_dump_event_list);
1163
1164         poptFreeContext(pc);
1165
1166         netsamlogon_cache_init(); /* Non-critical */
1167
1168         /* clear the cached list of trusted domains */
1169
1170         wcache_tdc_clear();
1171
1172         if (!init_domain_list()) {
1173                 DEBUG(0,("unable to initalize domain list\n"));
1174                 exit(1);
1175         }
1176
1177         init_idmap_child();
1178
1179         smb_nscd_flush_user_cache();
1180         smb_nscd_flush_group_cache();
1181
1182         /* Loop waiting for requests */
1183         winbindd_process_loop(server_mode);
1184
1185         return 0;
1186 }