source/winbindd/winbindd.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3
   4    Winbind daemon for ntdom nss module
   5
   6    Copyright (C) by Tim Potter 2000-2002
   7    Copyright (C) Andrew Tridgell 2002
   8    Copyright (C) Jelmer Vernooij 2003
   9    Copyright (C) Volker Lendecke 2004
  10
  11    This program is free software; you can redistribute it and/or modify
  12    it under the terms of the GNU General Public License as published by
  13    the Free Software Foundation; either version 3 of the License, or
  14    (at your option) any later version.
  15
  16    This program is distributed in the hope that it will be useful,
  17    but WITHOUT ANY WARRANTY; without even the implied warranty of
  18    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19    GNU General Public License for more details.
  20
  21    You should have received a copy of the GNU General Public License
  22    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  23 */
  24
  25 #include "includes.h"
  26 #include "winbindd.h"
  27
  28 #undef DBGC_CLASS
  29 #define DBGC_CLASS DBGC_WINBIND
  30
  31 bool opt_nocache = False;
  32 static bool interactive = False;
  33
  34 extern bool override_logfile;
  35
  36 struct event_context *winbind_event_context(void)
  37 {
  38         static struct event_context *ctx;
  39
  40         if (!ctx && !(ctx = event_context_init(NULL))) {
  41                 smb_panic("Could not init winbind event context");
  42         }
  43         return ctx;
  44 }
  45
  46 struct messaging_context *winbind_messaging_context(void)
  47 {
  48         static struct messaging_context *ctx;
  49
  50         if (ctx == NULL) {
  51                 ctx = messaging_init(NULL, server_id_self(),
  52                                      winbind_event_context());
  53         }
  54         if (ctx == NULL) {
  55                 DEBUG(0, ("Could not init winbind messaging context.\n"));
  56         }
  57         return ctx;
  58 }
  59
  60 /* Reload configuration */
  61
  62 static bool reload_services_file(const char *lfile)
  63 {
  64         bool ret;
  65
  66         if (lp_loaded()) {
  67                 const char *fname = lp_configfile();
  68
  69                 if (file_exist(fname,NULL) && !strcsequal(fname,get_dyn_CONFIGFILE())) {
  70                         set_dyn_CONFIGFILE(fname);
  71                 }
  72         }
  73
  74         /* if this is a child, restore the logfile to the special
  75            name - <domain>, idmap, etc. */
  76         if (lfile && *lfile) {
  77                 lp_set_logfile(lfile);
  78         }
  79
  80         reopen_logs();
  81         ret = lp_load(get_dyn_CONFIGFILE(),False,False,True,True);
  82
  83         reopen_logs();
  84         load_interfaces();
  85
  86         return(ret);
  87 }
  88
  89
  90 /**************************************************************************** **
  91  Handle a fault..
  92  **************************************************************************** */
  93
  94 static void fault_quit(void)
  95 {
  96         dump_core();
  97 }
  98
  99 static void winbindd_status(void)
 100 {
 101         struct winbindd_cli_state *tmp;
 102
 103         DEBUG(0, ("winbindd status:\n"));
 104
 105         /* Print client state information */
 106
 107         DEBUG(0, ("\t%d clients currently active\n", winbindd_num_clients()));
 108
 109         if (DEBUGLEVEL >= 2 && winbindd_num_clients()) {
 110                 DEBUG(2, ("\tclient list:\n"));
 111                 for(tmp = winbindd_client_list(); tmp; tmp = tmp->next) {
 112                         DEBUGADD(2, ("\t\tpid %lu, sock %d\n",
 113                                   (unsigned long)tmp->pid, tmp->sock));
 114                 }
 115         }
 116 }
 117
 118 /* Print winbindd status to log file */
 119
 120 static void print_winbindd_status(void)
 121 {
 122         winbindd_status();
 123 }
 124
 125 /* Flush client cache */
 126
 127 static void flush_caches(void)
 128 {
 129         /* We need to invalidate cached user list entries on a SIGHUP
 130            otherwise cached access denied errors due to restrict anonymous
 131            hang around until the sequence number changes. */
 132
 133         if (!wcache_invalidate_cache()) {
 134                 DEBUG(0, ("invalidating the cache failed; revalidate the cache\n"));
 135                 if (!winbindd_cache_validate_and_initialize()) {
 136                         exit(1);
 137                 }
 138         }
 139 }
 140
 141 /* Handle the signal by unlinking socket and exiting */
 142
 143 static void terminate(bool is_parent)
 144 {
 145         if (is_parent) {
 146                 /* When parent goes away we should
 147                  * remove the socket file. Not so
 148                  * when children terminate.
 149                  */
 150                 char *path = NULL;
 151
 152                 if (asprintf(&path, "%s/%s",
 153                         get_winbind_pipe_dir(), WINBINDD_SOCKET_NAME) > 0) {
 154                         unlink(path);
 155                         SAFE_FREE(path);
 156                 }
 157         }
 158
 159         idmap_close();
 160
 161         trustdom_cache_shutdown();
 162
 163 #if 0
 164         if (interactive) {
 165                 TALLOC_CTX *mem_ctx = talloc_init("end_description");
 166                 char *description = talloc_describe_all(mem_ctx);
 167
 168                 DEBUG(3, ("tallocs left:\n%s\n", description));
 169                 talloc_destroy(mem_ctx);
 170         }
 171 #endif
 172
 173         exit(0);
 174 }
 175
 176 static SIG_ATOMIC_T do_sigterm = 0;
 177
 178 static void termination_handler(int signum)
 179 {
 180         do_sigterm = 1;
 181         sys_select_signal(signum);
 182 }
 183
 184 static SIG_ATOMIC_T do_sigusr2 = 0;
 185
 186 static void sigusr2_handler(int signum)
 187 {
 188         do_sigusr2 = 1;
 189         sys_select_signal(SIGUSR2);
 190 }
 191
 192 static SIG_ATOMIC_T do_sighup = 0;
 193
 194 static void sighup_handler(int signum)
 195 {
 196         do_sighup = 1;
 197         sys_select_signal(SIGHUP);
 198 }
 199
 200 static SIG_ATOMIC_T do_sigchld = 0;
 201
 202 static void sigchld_handler(int signum)
 203 {
 204         do_sigchld = 1;
 205         sys_select_signal(SIGCHLD);
 206 }
 207
 208 /* React on 'smbcontrol winbindd reload-config' in the same way as on SIGHUP*/
 209 static void msg_reload_services(struct messaging_context *msg,
 210                                 void *private_data,
 211                                 uint32_t msg_type,
 212                                 struct server_id server_id,
 213                                 DATA_BLOB *data)
 214 {
 215         /* Flush various caches */
 216         flush_caches();
 217         reload_services_file((const char *) private_data);
 218 }
 219
 220 /* React on 'smbcontrol winbindd shutdown' in the same way as on SIGTERM*/
 221 static void msg_shutdown(struct messaging_context *msg,
 222                          void *private_data,
 223                          uint32_t msg_type,
 224                          struct server_id server_id,
 225                          DATA_BLOB *data)
 226 {
 227         do_sigterm = 1;
 228 }
 229
 230
 231 static void winbind_msg_validate_cache(struct messaging_context *msg_ctx,
 232                                        void *private_data,
 233                                        uint32_t msg_type,
 234                                        struct server_id server_id,
 235                                        DATA_BLOB *data)
 236 {
 237         uint8 ret;
 238         pid_t child_pid;
 239         struct sigaction act;
 240         struct sigaction oldact;
 241
 242         DEBUG(10, ("winbindd_msg_validate_cache: got validate-cache "
 243                    "message.\n"));
 244
 245         /*
 246          * call the validation code from a child:
 247          * so we don't block the main winbindd and the validation
 248          * code can safely use fork/waitpid...
 249          */
 250         CatchChild();
 251         child_pid = sys_fork();
 252
 253         if (child_pid == -1) {
 254                 DEBUG(1, ("winbind_msg_validate_cache: Could not fork: %s\n",
 255                           strerror(errno)));
 256                 return;
 257         }
 258
 259         if (child_pid != 0) {
 260                 /* parent */
 261                 DEBUG(5, ("winbind_msg_validate_cache: child created with "
 262                           "pid %d.\n", child_pid));
 263                 return;
 264         }
 265
 266         /* child */
 267
 268         /* install default SIGCHLD handler: validation code uses fork/waitpid */
 269         ZERO_STRUCT(act);
 270         act.sa_handler = SIG_DFL;
 271 #ifdef SA_RESTART
 272         /* We *want* SIGALRM to interrupt a system call. */
 273         act.sa_flags = SA_RESTART;
 274 #endif
 275         sigemptyset(&act.sa_mask);
 276         sigaddset(&act.sa_mask,SIGCHLD);
 277         sigaction(SIGCHLD,&act,&oldact);
 278
 279         ret = (uint8)winbindd_validate_cache_nobackup();
 280         DEBUG(10, ("winbindd_msg_validata_cache: got return value %d\n", ret));
 281         messaging_send_buf(msg_ctx, server_id, MSG_WINBIND_VALIDATE_CACHE, &ret,
 282                            (size_t)1);
 283         _exit(0);
 284 }
 285
 286 static struct winbindd_dispatch_table {
 287         enum winbindd_cmd cmd;
 288         void (*fn)(struct winbindd_cli_state *state);
 289         const char *winbindd_cmd_name;
 290 } dispatch_table[] = {
 291
 292         /* User functions */
 293
 294         { WINBINDD_GETPWNAM, winbindd_getpwnam, "GETPWNAM" },
 295         { WINBINDD_GETPWUID, winbindd_getpwuid, "GETPWUID" },
 296
 297         { WINBINDD_SETPWENT, winbindd_setpwent, "SETPWENT" },
 298         { WINBINDD_ENDPWENT, winbindd_endpwent, "ENDPWENT" },
 299         { WINBINDD_GETPWENT, winbindd_getpwent, "GETPWENT" },
 300
 301         { WINBINDD_GETGROUPS, winbindd_getgroups, "GETGROUPS" },
 302         { WINBINDD_GETUSERSIDS, winbindd_getusersids, "GETUSERSIDS" },
 303         { WINBINDD_GETUSERDOMGROUPS, winbindd_getuserdomgroups,
 304           "GETUSERDOMGROUPS" },
 305
 306         /* Group functions */
 307
 308         { WINBINDD_GETGRNAM, winbindd_getgrnam, "GETGRNAM" },
 309         { WINBINDD_GETGRGID, winbindd_getgrgid, "GETGRGID" },
 310         { WINBINDD_SETGRENT, winbindd_setgrent, "SETGRENT" },
 311         { WINBINDD_ENDGRENT, winbindd_endgrent, "ENDGRENT" },
 312         { WINBINDD_GETGRENT, winbindd_getgrent, "GETGRENT" },
 313         { WINBINDD_GETGRLST, winbindd_getgrent, "GETGRLST" },
 314
 315         /* PAM auth functions */
 316
 317         { WINBINDD_PAM_AUTH, winbindd_pam_auth, "PAM_AUTH" },
 318         { WINBINDD_PAM_AUTH_CRAP, winbindd_pam_auth_crap, "AUTH_CRAP" },
 319         { WINBINDD_PAM_CHAUTHTOK, winbindd_pam_chauthtok, "CHAUTHTOK" },
 320         { WINBINDD_PAM_LOGOFF, winbindd_pam_logoff, "PAM_LOGOFF" },
 321         { WINBINDD_PAM_CHNG_PSWD_AUTH_CRAP, winbindd_pam_chng_pswd_auth_crap, "CHNG_PSWD_AUTH_CRAP" },
 322
 323         /* Enumeration functions */
 324
 325         { WINBINDD_LIST_USERS, winbindd_list_users, "LIST_USERS" },
 326         { WINBINDD_LIST_GROUPS, winbindd_list_groups, "LIST_GROUPS" },
 327         { WINBINDD_LIST_TRUSTDOM, winbindd_list_trusted_domains,
 328           "LIST_TRUSTDOM" },
 329         { WINBINDD_SHOW_SEQUENCE, winbindd_show_sequence, "SHOW_SEQUENCE" },
 330
 331         /* SID related functions */
 332
 333         { WINBINDD_LOOKUPSID, winbindd_lookupsid, "LOOKUPSID" },
 334         { WINBINDD_LOOKUPNAME, winbindd_lookupname, "LOOKUPNAME" },
 335         { WINBINDD_LOOKUPRIDS, winbindd_lookuprids, "LOOKUPRIDS" },
 336
 337         /* Lookup related functions */
 338
 339         { WINBINDD_SID_TO_UID, winbindd_sid_to_uid, "SID_TO_UID" },
 340         { WINBINDD_SID_TO_GID, winbindd_sid_to_gid, "SID_TO_GID" },
 341         { WINBINDD_UID_TO_SID, winbindd_uid_to_sid, "UID_TO_SID" },
 342         { WINBINDD_GID_TO_SID, winbindd_gid_to_sid, "GID_TO_SID" },
 343         { WINBINDD_ALLOCATE_UID, winbindd_allocate_uid, "ALLOCATE_UID" },
 344         { WINBINDD_ALLOCATE_GID, winbindd_allocate_gid, "ALLOCATE_GID" },
 345         { WINBINDD_SET_MAPPING, winbindd_set_mapping, "SET_MAPPING" },
 346         { WINBINDD_REMOVE_MAPPING, winbindd_remove_mapping, "REMOVE_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. winbindd_fd_event->handler is called whenever the socket is readable/writable.
 419  */
 420
 421 static struct winbindd_fd_event *fd_events = NULL;
 422
 423 void add_fd_event(struct winbindd_fd_event *ev)
 424 {
 425         struct winbindd_fd_event *match;
 426
 427         /* only add unique winbindd_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 winbindd_fd_event *ev)
 442 {
 443         DLIST_REMOVE(fd_events, ev);
 444 }
 445
 446 /*
 447  * Handler for winbindd_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 winbindd_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 winbindd_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 winbindd_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 winbindd_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 static void response_main_sent(void *private_data, bool success);
 539 static void response_extra_sent(void *private_data, bool success);
 540
 541 static void response_extra_sent(void *private_data, bool success)
 542 {
 543         struct winbindd_cli_state *state =
 544                 talloc_get_type_abort(private_data, struct winbindd_cli_state);
 545
 546         TALLOC_FREE(state->mem_ctx);
 547
 548         if (!success) {
 549                 state->finished = True;
 550                 return;
 551         }
 552
 553         SAFE_FREE(state->response.extra_data.data);
 554
 555         setup_async_read(&state->fd_event, &state->request, sizeof(uint32),
 556                          request_len_recv, state);
 557 }
 558
 559 static void response_main_sent(void *private_data, bool success)
 560 {
 561         struct winbindd_cli_state *state =
 562                 talloc_get_type_abort(private_data, struct winbindd_cli_state);
 563
 564         if (!success) {
 565                 state->finished = True;
 566                 return;
 567         }
 568
 569         if (state->response.length == sizeof(state->response)) {
 570                 TALLOC_FREE(state->mem_ctx);
 571
 572                 setup_async_read(&state->fd_event, &state->request,
 573                                  sizeof(uint32), request_len_recv, state);
 574                 return;
 575         }
 576
 577         setup_async_write(&state->fd_event, state->response.extra_data.data,
 578                           state->response.length - sizeof(state->response),
 579                           response_extra_sent, state);
 580 }
 581
 582 static void request_finished(struct winbindd_cli_state *state)
 583 {
 584         /* Make sure request.extra_data is freed when finish processing a request */
 585         SAFE_FREE(state->request.extra_data.data);
 586         setup_async_write(&state->fd_event, &state->response,
 587                           sizeof(state->response), response_main_sent, state);
 588 }
 589
 590 void request_error(struct winbindd_cli_state *state)
 591 {
 592         SMB_ASSERT(state->response.result == WINBINDD_PENDING);
 593         state->response.result = WINBINDD_ERROR;
 594         request_finished(state);
 595 }
 596
 597 void request_ok(struct winbindd_cli_state *state)
 598 {
 599         SMB_ASSERT(state->response.result == WINBINDD_PENDING);
 600         state->response.result = WINBINDD_OK;
 601         request_finished(state);
 602 }
 603
 604 static void request_len_recv(void *private_data, bool success)
 605 {
 606         struct winbindd_cli_state *state =
 607                 talloc_get_type_abort(private_data, struct winbindd_cli_state);
 608
 609         if (!success) {
 610                 state->finished = True;
 611                 return;
 612         }
 613
 614         if (*(uint32 *)(&state->request) != sizeof(state->request)) {
 615                 DEBUG(0,("request_len_recv: Invalid request size received: %d (expected %u)\n",
 616                          *(uint32_t *)(&state->request), (uint32_t)sizeof(state->request)));
 617                 state->finished = True;
 618                 return;
 619         }
 620
 621         setup_async_read(&state->fd_event, (uint32 *)(&state->request)+1,
 622                          sizeof(state->request) - sizeof(uint32),
 623                          request_main_recv, state);
 624 }
 625
 626 static void request_main_recv(void *private_data, bool success)
 627 {
 628         struct winbindd_cli_state *state =
 629                 talloc_get_type_abort(private_data, struct winbindd_cli_state);
 630
 631         if (!success) {
 632                 state->finished = True;
 633                 return;
 634         }
 635
 636         if (state->request.extra_len == 0) {
 637                 state->request.extra_data.data = NULL;
 638                 request_recv(state, True);
 639                 return;
 640         }
 641
 642         if ((!state->privileged) &&
 643             (state->request.extra_len > WINBINDD_MAX_EXTRA_DATA)) {
 644                 DEBUG(3, ("Got request with %d bytes extra data on "
 645                           "unprivileged socket\n", (int)state->request.extra_len));
 646                 state->request.extra_data.data = NULL;
 647                 state->finished = True;
 648                 return;
 649         }
 650
 651         state->request.extra_data.data =
 652                 SMB_MALLOC_ARRAY(char, state->request.extra_len + 1);
 653
 654         if (state->request.extra_data.data == NULL) {
 655                 DEBUG(0, ("malloc failed\n"));
 656                 state->finished = True;
 657                 return;
 658         }
 659
 660         /* Ensure null termination */
 661         state->request.extra_data.data[state->request.extra_len] = '\0';
 662
 663         setup_async_read(&state->fd_event, state->request.extra_data.data,
 664                          state->request.extra_len, request_recv, state);
 665 }
 666
 667 static void request_recv(void *private_data, bool success)
 668 {
 669         struct winbindd_cli_state *state =
 670                 talloc_get_type_abort(private_data, struct winbindd_cli_state);
 671
 672         if (!success) {
 673                 state->finished = True;
 674                 return;
 675         }
 676
 677         process_request(state);
 678 }
 679
 680 /* Process a new connection by adding it to the client connection list */
 681
 682 static void new_connection(int listen_sock, bool privileged)
 683 {
 684         struct sockaddr_un sunaddr;
 685         struct winbindd_cli_state *state;
 686         socklen_t len;
 687         int sock;
 688
 689         /* Accept connection */
 690
 691         len = sizeof(sunaddr);
 692
 693         do {
 694                 sock = accept(listen_sock, (struct sockaddr *)&sunaddr, &len);
 695         } while (sock == -1 && errno == EINTR);
 696
 697         if (sock == -1)
 698                 return;
 699
 700         DEBUG(6,("accepted socket %d\n", sock));
 701
 702         /* Create new connection structure */
 703
 704         if ((state = TALLOC_ZERO_P(NULL, struct winbindd_cli_state)) == NULL) {
 705                 close(sock);
 706                 return;
 707         }
 708
 709         state->sock = sock;
 710
 711         state->last_access = time(NULL);
 712
 713         state->privileged = privileged;
 714
 715         state->fd_event.fd = state->sock;
 716         state->fd_event.flags = 0;
 717         add_fd_event(&state->fd_event);
 718
 719         setup_async_read(&state->fd_event, &state->request, sizeof(uint32),
 720                          request_len_recv, state);
 721
 722         /* Add to connection list */
 723
 724         winbindd_add_client(state);
 725 }
 726
 727 /* Remove a client connection from client connection list */
 728
 729 static void remove_client(struct winbindd_cli_state *state)
 730 {
 731         char c = 0;
 732         int nwritten;
 733
 734         /* It's a dead client - hold a funeral */
 735
 736         if (state == NULL) {
 737                 return;
 738         }
 739
 740         /* tell client, we are closing ... */
 741         nwritten = write(state->sock, &c, sizeof(c));
 742         if (nwritten == -1) {
 743                 DEBUG(2, ("final write to client failed: %s\n",
 744                           strerror(errno)));
 745         }
 746
 747         /* Close socket */
 748
 749         close(state->sock);
 750
 751         /* Free any getent state */
 752
 753         free_getent_state(state->getpwent_state);
 754         free_getent_state(state->getgrent_state);
 755
 756         /* We may have some extra data that was not freed if the client was
 757            killed unexpectedly */
 758
 759         SAFE_FREE(state->response.extra_data.data);
 760
 761         TALLOC_FREE(state->mem_ctx);
 762
 763         remove_fd_event(&state->fd_event);
 764
 765         /* Remove from list and free */
 766
 767         winbindd_remove_client(state);
 768         TALLOC_FREE(state);
 769 }
 770
 771 /* Shutdown client connection which has been idle for the longest time */
 772
 773 static bool remove_idle_client(void)
 774 {
 775         struct winbindd_cli_state *state, *remove_state = NULL;
 776         time_t last_access = 0;
 777         int nidle = 0;
 778
 779         for (state = winbindd_client_list(); state; state = state->next) {
 780                 if (state->response.result != WINBINDD_PENDING &&
 781                     !state->getpwent_state && !state->getgrent_state) {
 782                         nidle++;
 783                         if (!last_access || state->last_access < last_access) {
 784                                 last_access = state->last_access;
 785                                 remove_state = state;
 786                         }
 787                 }
 788         }
 789
 790         if (remove_state) {
 791                 DEBUG(5,("Found %d idle client connections, shutting down sock %d, pid %u\n",
 792                         nidle, remove_state->sock, (unsigned int)remove_state->pid));
 793                 remove_client(remove_state);
 794                 return True;
 795         }
 796
 797         return False;
 798 }
 799
 800 /* check if HUP has been received and reload files */
 801 void winbind_check_sighup(const char *lfile)
 802 {
 803         if (do_sighup) {
 804
 805                 DEBUG(3, ("got SIGHUP\n"));
 806
 807                 flush_caches();
 808                 reload_services_file(lfile);
 809
 810                 do_sighup = 0;
 811         }
 812 }
 813
 814 /* check if TERM has been received */
 815 void winbind_check_sigterm(bool is_parent)
 816 {
 817         if (do_sigterm)
 818                 terminate(is_parent);
 819 }
 820
 821 /* Process incoming clients on listen_sock.  We use a tricky non-blocking,
 822    non-forking, non-threaded model which allows us to handle many
 823    simultaneous connections while remaining impervious to many denial of
 824    service attacks. */
 825
 826 static void process_loop(void)
 827 {
 828         struct winbindd_cli_state *state;
 829         struct winbindd_fd_event *ev;
 830         fd_set r_fds, w_fds;
 831         int maxfd, listen_sock, listen_priv_sock, selret;
 832         struct timeval timeout, ev_timeout;
 833
 834         /* Open Sockets here to get stuff going ASAP */
 835         listen_sock = open_winbindd_socket();
 836         listen_priv_sock = open_winbindd_priv_socket();
 837
 838         if (listen_sock == -1 || listen_priv_sock == -1) {
 839                 perror("open_winbind_socket");
 840                 exit(1);
 841         }
 842
 843         /* We'll be doing this a lot */
 844
 845         /* Handle messages */
 846
 847         message_dispatch(winbind_messaging_context());
 848
 849         run_events(winbind_event_context(), 0, NULL, NULL);
 850
 851         /* refresh the trusted domain cache */
 852
 853         rescan_trusted_domains();
 854
 855         /* Initialise fd lists for select() */
 856
 857         maxfd = MAX(listen_sock, listen_priv_sock);
 858
 859         FD_ZERO(&r_fds);
 860         FD_ZERO(&w_fds);
 861         FD_SET(listen_sock, &r_fds);
 862         FD_SET(listen_priv_sock, &r_fds);
 863
 864         timeout.tv_sec = WINBINDD_ESTABLISH_LOOP;
 865         timeout.tv_usec = 0;
 866
 867         /* Check for any event timeouts. */
 868         if (get_timed_events_timeout(winbind_event_context(), &ev_timeout)) {
 869                 timeout = timeval_min(&timeout, &ev_timeout);
 870         }
 871
 872         /* Set up client readers and writers */
 873
 874         state = winbindd_client_list();
 875
 876         while (state) {
 877
 878                 struct winbindd_cli_state *next = state->next;
 879
 880                 /* Dispose of client connection if it is marked as
 881                    finished */
 882
 883                 if (state->finished)
 884                         remove_client(state);
 885
 886                 state = next;
 887         }
 888
 889         for (ev = fd_events; ev; ev = ev->next) {
 890                 if (ev->flags & EVENT_FD_READ) {
 891                         FD_SET(ev->fd, &r_fds);
 892                         maxfd = MAX(ev->fd, maxfd);
 893                 }
 894                 if (ev->flags & EVENT_FD_WRITE) {
 895                         FD_SET(ev->fd, &w_fds);
 896                         maxfd = MAX(ev->fd, maxfd);
 897                 }
 898         }
 899
 900         /* Call select */
 901
 902         selret = sys_select(maxfd + 1, &r_fds, &w_fds, NULL, &timeout);
 903
 904         if (selret == 0) {
 905                 goto no_fds_ready;
 906         }
 907
 908         if (selret == -1) {
 909                 if (errno == EINTR) {
 910                         goto no_fds_ready;
 911                 }
 912
 913                 /* Select error, something is badly wrong */
 914
 915                 perror("select");
 916                 exit(1);
 917         }
 918
 919         /* selret > 0 */
 920
 921         ev = fd_events;
 922         while (ev != NULL) {
 923                 struct winbindd_fd_event *next = ev->next;
 924                 int flags = 0;
 925                 if (FD_ISSET(ev->fd, &r_fds))
 926                         flags |= EVENT_FD_READ;
 927                 if (FD_ISSET(ev->fd, &w_fds))
 928                         flags |= EVENT_FD_WRITE;
 929                 if (flags)
 930                         ev->handler(ev, flags);
 931                 ev = next;
 932         }
 933
 934         if (FD_ISSET(listen_sock, &r_fds)) {
 935                 while (winbindd_num_clients() >
 936                        WINBINDD_MAX_SIMULTANEOUS_CLIENTS - 1) {
 937                         DEBUG(5,("winbindd: Exceeding %d client "
 938                                  "connections, removing idle "
 939                                  "connection.\n",
 940                                  WINBINDD_MAX_SIMULTANEOUS_CLIENTS));
 941                         if (!remove_idle_client()) {
 942                                 DEBUG(0,("winbindd: Exceeding %d "
 943                                          "client connections, no idle "
 944                                          "connection found\n",
 945                                          WINBINDD_MAX_SIMULTANEOUS_CLIENTS));
 946                                 break;
 947                         }
 948                 }
 949                 /* new, non-privileged connection */
 950                 new_connection(listen_sock, False);
 951         }
 952
 953         if (FD_ISSET(listen_priv_sock, &r_fds)) {
 954                 while (winbindd_num_clients() >
 955                        WINBINDD_MAX_SIMULTANEOUS_CLIENTS - 1) {
 956                         DEBUG(5,("winbindd: Exceeding %d client "
 957                                  "connections, removing idle "
 958                                  "connection.\n",
 959                                  WINBINDD_MAX_SIMULTANEOUS_CLIENTS));
 960                         if (!remove_idle_client()) {
 961                                 DEBUG(0,("winbindd: Exceeding %d "
 962                                          "client connections, no idle "
 963                                          "connection found\n",
 964                                          WINBINDD_MAX_SIMULTANEOUS_CLIENTS));
 965                                 break;
 966                         }
 967                 }
 968                 /* new, privileged connection */
 969                 new_connection(listen_priv_sock, True);
 970         }
 971
 972  no_fds_ready:
 973
 974 #if 0
 975         winbindd_check_cache_size(time(NULL));
 976 #endif
 977
 978         /* Check signal handling things */
 979
 980         winbind_check_sigterm(true);
 981         winbind_check_sighup(NULL);
 982
 983         if (do_sigusr2) {
 984                 print_winbindd_status();
 985                 do_sigusr2 = 0;
 986         }
 987
 988         if (do_sigchld) {
 989                 pid_t pid;
 990
 991                 do_sigchld = 0;
 992
 993                 while ((pid = sys_waitpid(-1, NULL, WNOHANG)) > 0) {
 994                         winbind_child_died(pid);
 995                 }
 996         }
 997 }
 998
 999 /* Main function */
1000
1001 int main(int argc, char **argv, char **envp)
1002 {
1003         static bool is_daemon = False;
1004         static bool Fork = True;
1005         static bool log_stdout = False;
1006         static bool no_process_group = False;
1007         enum {
1008                 OPT_DAEMON = 1000,
1009                 OPT_FORK,
1010                 OPT_NO_PROCESS_GROUP,
1011                 OPT_LOG_STDOUT
1012         };
1013         struct poptOption long_options[] = {
1014                 POPT_AUTOHELP
1015                 { "stdout", 'S', POPT_ARG_NONE, NULL, OPT_LOG_STDOUT, "Log to stdout" },
1016                 { "foreground", 'F', POPT_ARG_NONE, NULL, OPT_FORK, "Daemon in foreground mode" },
1017                 { "no-process-group", 0, POPT_ARG_NONE, NULL, OPT_NO_PROCESS_GROUP, "Don't create a new process group" },
1018                 { "daemon", 'D', POPT_ARG_NONE, NULL, OPT_DAEMON, "Become a daemon (default)" },
1019                 { "interactive", 'i', POPT_ARG_NONE, NULL, 'i', "Interactive mode" },
1020                 { "no-caching", 'n', POPT_ARG_NONE, NULL, 'n', "Disable caching" },
1021                 POPT_COMMON_SAMBA
1022                 POPT_TABLEEND
1023         };
1024         poptContext pc;
1025         int opt;
1026         TALLOC_CTX *frame = talloc_stackframe();
1027
1028         /* glibc (?) likes to print "User defined signal 1" and exit if a
1029            SIGUSR[12] is received before a handler is installed */
1030
1031         CatchSignal(SIGUSR1, SIG_IGN);
1032         CatchSignal(SIGUSR2, SIG_IGN);
1033
1034         fault_setup((void (*)(void *))fault_quit );
1035         dump_core_setup("winbindd");
1036
1037         load_case_tables();
1038
1039         /* Initialise for running in non-root mode */
1040
1041         sec_init();
1042
1043         set_remote_machine_name("winbindd", False);
1044
1045         /* Set environment variable so we don't recursively call ourselves.
1046            This may also be useful interactively. */
1047
1048         if ( !winbind_off() ) {
1049                 DEBUG(0,("Failed to disable recusive winbindd calls.  Exiting.\n"));
1050                 exit(1);
1051         }
1052
1053         /* Initialise samba/rpc client stuff */
1054
1055         pc = poptGetContext("winbindd", argc, (const char **)argv, long_options, 0);
1056
1057         while ((opt = poptGetNextOpt(pc)) != -1) {
1058                 switch (opt) {
1059                         /* Don't become a daemon */
1060                 case OPT_DAEMON:
1061                         is_daemon = True;
1062                         break;
1063                 case 'i':
1064                         interactive = True;
1065                         log_stdout = True;
1066                         Fork = False;
1067                         break;
1068                 case OPT_FORK:
1069                         Fork = false;
1070                         break;
1071                 case OPT_NO_PROCESS_GROUP:
1072                         no_process_group = true;
1073                         break;
1074                 case OPT_LOG_STDOUT:
1075                         log_stdout = true;
1076                         break;
1077                 case 'n':
1078                         opt_nocache = true;
1079                         break;
1080                 default:
1081                         d_fprintf(stderr, "\nInvalid option %s: %s\n\n",
1082                                   poptBadOption(pc, 0), poptStrerror(opt));
1083                         poptPrintUsage(pc, stderr, 0);
1084                         exit(1);
1085                 }
1086         }
1087
1088         if (is_daemon && interactive) {
1089                 d_fprintf(stderr,"\nERROR: "
1090                           "Option -i|--interactive is not allowed together with -D|--daemon\n\n");
1091                 poptPrintUsage(pc, stderr, 0);
1092                 exit(1);
1093         }
1094
1095         if (log_stdout && Fork) {
1096                 d_fprintf(stderr, "\nERROR: "
1097                           "Can't log to stdout (-S) unless daemon is in foreground +(-F) or interactive (-i)\n\n");
1098                 poptPrintUsage(pc, stderr, 0);
1099                 exit(1);
1100         }
1101
1102         poptFreeContext(pc);
1103
1104         if (!override_logfile) {
1105                 char *lfile = NULL;
1106                 if (asprintf(&lfile,"%s/log.winbindd",
1107                                 get_dyn_LOGFILEBASE()) > 0) {
1108                         lp_set_logfile(lfile);
1109                         SAFE_FREE(lfile);
1110                 }
1111         }
1112         setup_logging("winbindd", log_stdout);
1113         reopen_logs();
1114
1115         DEBUG(0,("winbindd version %s started.\n", SAMBA_VERSION_STRING));
1116         DEBUGADD(0,("%s\n", COPYRIGHT_STARTUP_MESSAGE));
1117
1118         if (!lp_load_initial_only(get_dyn_CONFIGFILE())) {
1119                 DEBUG(0, ("error opening config file\n"));
1120                 exit(1);
1121         }
1122
1123         /* Initialise messaging system */
1124
1125         if (winbind_messaging_context() == NULL) {
1126                 exit(1);
1127         }
1128
1129         if (!reload_services_file(NULL)) {
1130                 DEBUG(0, ("error opening config file\n"));
1131                 exit(1);
1132         }
1133
1134         if (!directory_exist(lp_lockdir(), NULL)) {
1135                 mkdir(lp_lockdir(), 0755);
1136         }
1137
1138         /* Setup names. */
1139
1140         if (!init_names())
1141                 exit(1);
1142
1143         load_interfaces();
1144
1145         if (!secrets_init()) {
1146
1147                 DEBUG(0,("Could not initialize domain trust account secrets. Giving up\n"));
1148                 return False;
1149         }
1150
1151         /* Enable netbios namecache */
1152
1153         namecache_enable();
1154
1155         /* Unblock all signals we are interested in as they may have been
1156            blocked by the parent process. */
1157
1158         BlockSignals(False, SIGINT);
1159         BlockSignals(False, SIGQUIT);
1160         BlockSignals(False, SIGTERM);
1161         BlockSignals(False, SIGUSR1);
1162         BlockSignals(False, SIGUSR2);
1163         BlockSignals(False, SIGHUP);
1164         BlockSignals(False, SIGCHLD);
1165
1166         /* Setup signal handlers */
1167
1168         CatchSignal(SIGINT, termination_handler);      /* Exit on these sigs */
1169         CatchSignal(SIGQUIT, termination_handler);
1170         CatchSignal(SIGTERM, termination_handler);
1171         CatchSignal(SIGCHLD, sigchld_handler);
1172
1173         CatchSignal(SIGPIPE, SIG_IGN);                 /* Ignore sigpipe */
1174
1175         CatchSignal(SIGUSR2, sigusr2_handler);         /* Debugging sigs */
1176         CatchSignal(SIGHUP, sighup_handler);
1177
1178         if (!interactive)
1179                 become_daemon(Fork, no_process_group);
1180
1181         pidfile_create("winbindd");
1182
1183 #if HAVE_SETPGID
1184         /*
1185          * If we're interactive we want to set our own process group for
1186          * signal management.
1187          */
1188         if (interactive && !no_process_group)
1189                 setpgid( (pid_t)0, (pid_t)0);
1190 #endif
1191
1192         TimeInit();
1193
1194         /* Don't use winbindd_reinit_after_fork here as
1195          * we're just starting up and haven't created any
1196          * winbindd-specific resources we must free yet. JRA.
1197          */
1198
1199         if (!reinit_after_fork(winbind_messaging_context(),
1200                                winbind_event_context(), false)) {
1201                 DEBUG(0,("reinit_after_fork() failed\n"));
1202                 exit(1);
1203         }
1204
1205         /*
1206          * Ensure all cache and idmap caches are consistent
1207          * and initialized before we startup.
1208          */
1209         if (!winbindd_cache_validate_and_initialize()) {
1210                 exit(1);
1211         }
1212
1213         /* get broadcast messages */
1214         claim_connection(NULL,"",FLAG_MSG_GENERAL|FLAG_MSG_DBWRAP);
1215
1216         /* React on 'smbcontrol winbindd reload-config' in the same way
1217            as to SIGHUP signal */
1218         messaging_register(winbind_messaging_context(), NULL,
1219                            MSG_SMB_CONF_UPDATED, msg_reload_services);
1220         messaging_register(winbind_messaging_context(), NULL,
1221                            MSG_SHUTDOWN, msg_shutdown);
1222
1223         /* Handle online/offline messages. */
1224         messaging_register(winbind_messaging_context(), NULL,
1225                            MSG_WINBIND_OFFLINE, winbind_msg_offline);
1226         messaging_register(winbind_messaging_context(), NULL,
1227                            MSG_WINBIND_ONLINE, winbind_msg_online);
1228         messaging_register(winbind_messaging_context(), NULL,
1229                            MSG_WINBIND_ONLINESTATUS, winbind_msg_onlinestatus);
1230
1231         messaging_register(winbind_messaging_context(), NULL,
1232                            MSG_DUMP_EVENT_LIST, winbind_msg_dump_event_list);
1233
1234         messaging_register(winbind_messaging_context(), NULL,
1235                            MSG_WINBIND_VALIDATE_CACHE,
1236                            winbind_msg_validate_cache);
1237
1238         messaging_register(winbind_messaging_context(), NULL,
1239                            MSG_WINBIND_DUMP_DOMAIN_LIST,
1240                            winbind_msg_dump_domain_list);
1241
1242         /* Register handler for MSG_DEBUG. */
1243         messaging_register(winbind_messaging_context(), NULL,
1244                            MSG_DEBUG,
1245                            winbind_msg_debug);
1246
1247         netsamlogon_cache_init(); /* Non-critical */
1248
1249         /* clear the cached list of trusted domains */
1250
1251         wcache_tdc_clear();
1252
1253         if (!init_domain_list()) {
1254                 DEBUG(0,("unable to initialize domain list\n"));
1255                 exit(1);
1256         }
1257
1258         init_idmap_child();
1259         init_locator_child();
1260
1261         smb_nscd_flush_user_cache();
1262         smb_nscd_flush_group_cache();
1263
1264         /* Loop waiting for requests */
1265
1266         TALLOC_FREE(frame);
1267         while (1) {
1268                 frame = talloc_stackframe();
1269                 process_loop();
1270                 TALLOC_FREE(frame);
1271         }
1272
1273         return 0;
1274 }