source3/winbindd/winbindd.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3
   4    Winbind daemon for ntdom nss module
   5
   6    Copyright (C) by Tim Potter 2000-2002
   7    Copyright (C) Andrew Tridgell 2002
   8    Copyright (C) Jelmer Vernooij 2003
   9    Copyright (C) Volker Lendecke 2004
  10
  11    This program is free software; you can redistribute it and/or modify
  12    it under the terms of the GNU General Public License as published by
  13    the Free Software Foundation; either version 3 of the License, or
  14    (at your option) any later version.
  15
  16    This program is distributed in the hope that it will be useful,
  17    but WITHOUT ANY WARRANTY; without even the implied warranty of
  18    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19    GNU General Public License for more details.
  20
  21    You should have received a copy of the GNU General Public License
  22    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  23 */
  24
  25 #include "includes.h"
  26 #include "winbindd.h"
  27
  28 #undef DBGC_CLASS
  29 #define DBGC_CLASS DBGC_WINBIND
  30
  31 bool opt_nocache = False;
  32 static bool interactive = False;
  33
  34 extern bool override_logfile;
  35
  36 struct event_context *winbind_event_context(void)
  37 {
  38         static struct event_context *ctx;
  39
  40         if (!ctx && !(ctx = event_context_init(NULL))) {
  41                 smb_panic("Could not init winbind event context");
  42         }
  43         return ctx;
  44 }
  45
  46 struct messaging_context *winbind_messaging_context(void)
  47 {
  48         static struct messaging_context *ctx;
  49
  50         if (ctx == 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) && !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 void winbindd_sig_term_handler(struct tevent_context *ev,
 177                                       struct tevent_signal *se,
 178                                       int signum,
 179                                       int count,
 180                                       void *siginfo,
 181                                       void *private_data)
 182 {
 183         bool *is_parent = talloc_get_type_abort(private_data, bool);
 184
 185         DEBUG(0,("Got sig[%d] terminate (is_parent=%d)\n",
 186                  signum, (int)*is_parent));
 187         terminate(*is_parent);
 188 }
 189
 190 bool winbindd_setup_sig_term_handler(bool parent)
 191 {
 192         struct tevent_signal *se;
 193         bool *is_parent;
 194
 195         is_parent = talloc(winbind_event_context(), bool);
 196         if (!is_parent) {
 197                 return false;
 198         }
 199
 200         *is_parent = parent;
 201
 202         se = tevent_add_signal(winbind_event_context(),
 203                                is_parent,
 204                                SIGTERM, 0,
 205                                winbindd_sig_term_handler,
 206                                is_parent);
 207         if (!se) {
 208                 DEBUG(0,("failed to setup SIGTERM handler"));
 209                 talloc_free(is_parent);
 210                 return false;
 211         }
 212
 213         se = tevent_add_signal(winbind_event_context(),
 214                                is_parent,
 215                                SIGINT, 0,
 216                                winbindd_sig_term_handler,
 217                                is_parent);
 218         if (!se) {
 219                 DEBUG(0,("failed to setup SIGINT handler"));
 220                 talloc_free(is_parent);
 221                 return false;
 222         }
 223
 224         se = tevent_add_signal(winbind_event_context(),
 225                                is_parent,
 226                                SIGQUIT, 0,
 227                                winbindd_sig_term_handler,
 228                                is_parent);
 229         if (!se) {
 230                 DEBUG(0,("failed to setup SIGINT handler"));
 231                 talloc_free(is_parent);
 232                 return false;
 233         }
 234
 235         return true;
 236 }
 237
 238 static void winbindd_sig_hup_handler(struct tevent_context *ev,
 239                                      struct tevent_signal *se,
 240                                      int signum,
 241                                      int count,
 242                                      void *siginfo,
 243                                      void *private_data)
 244 {
 245         const char *file = (const char *)private_data;
 246
 247         DEBUG(1,("Reloading services after SIGHUP\n"));
 248         flush_caches();
 249         reload_services_file(file);
 250 }
 251
 252 bool winbindd_setup_sig_hup_handler(const char *lfile)
 253 {
 254         struct tevent_signal *se;
 255         char *file = NULL;
 256
 257         if (lfile) {
 258                 file = talloc_strdup(winbind_event_context(),
 259                                      lfile);
 260                 if (!file) {
 261                         return false;
 262                 }
 263         }
 264
 265         se = tevent_add_signal(winbind_event_context(),
 266                                winbind_event_context(),
 267                                SIGHUP, 0,
 268                                winbindd_sig_hup_handler,
 269                                file);
 270         if (!se) {
 271                 return false;
 272         }
 273
 274         return true;
 275 }
 276
 277 static void winbindd_sig_chld_handler(struct tevent_context *ev,
 278                                       struct tevent_signal *se,
 279                                       int signum,
 280                                       int count,
 281                                       void *siginfo,
 282                                       void *private_data)
 283 {
 284         pid_t pid;
 285
 286         while ((pid = sys_waitpid(-1, NULL, WNOHANG)) > 0) {
 287                 winbind_child_died(pid);
 288         }
 289 }
 290
 291 static bool winbindd_setup_sig_chld_handler(void)
 292 {
 293         struct tevent_signal *se;
 294
 295         se = tevent_add_signal(winbind_event_context(),
 296                                winbind_event_context(),
 297                                SIGCHLD, 0,
 298                                winbindd_sig_chld_handler,
 299                                NULL);
 300         if (!se) {
 301                 return false;
 302         }
 303
 304         return true;
 305 }
 306
 307 static void winbindd_sig_usr2_handler(struct tevent_context *ev,
 308                                       struct tevent_signal *se,
 309                                       int signum,
 310                                       int count,
 311                                       void *siginfo,
 312                                       void *private_data)
 313 {
 314         print_winbindd_status();
 315 }
 316
 317 static bool winbindd_setup_sig_usr2_handler(void)
 318 {
 319         struct tevent_signal *se;
 320
 321         se = tevent_add_signal(winbind_event_context(),
 322                                winbind_event_context(),
 323                                SIGCHLD, 0,
 324                                winbindd_sig_usr2_handler,
 325                                NULL);
 326         if (!se) {
 327                 return false;
 328         }
 329
 330         return true;
 331 }
 332
 333 /* React on 'smbcontrol winbindd reload-config' in the same way as on SIGHUP*/
 334 static void msg_reload_services(struct messaging_context *msg,
 335                                 void *private_data,
 336                                 uint32_t msg_type,
 337                                 struct server_id server_id,
 338                                 DATA_BLOB *data)
 339 {
 340         /* Flush various caches */
 341         flush_caches();
 342         reload_services_file((const char *) private_data);
 343 }
 344
 345 /* React on 'smbcontrol winbindd shutdown' in the same way as on SIGTERM*/
 346 static void msg_shutdown(struct messaging_context *msg,
 347                          void *private_data,
 348                          uint32_t msg_type,
 349                          struct server_id server_id,
 350                          DATA_BLOB *data)
 351 {
 352         /* only the parent waits for this message */
 353         DEBUG(0,("Got shutdown message\n"));
 354         terminate(true);
 355 }
 356
 357
 358 static void winbind_msg_validate_cache(struct messaging_context *msg_ctx,
 359                                        void *private_data,
 360                                        uint32_t msg_type,
 361                                        struct server_id server_id,
 362                                        DATA_BLOB *data)
 363 {
 364         uint8 ret;
 365         pid_t child_pid;
 366         struct sigaction act;
 367         struct sigaction oldact;
 368
 369         DEBUG(10, ("winbindd_msg_validate_cache: got validate-cache "
 370                    "message.\n"));
 371
 372         /*
 373          * call the validation code from a child:
 374          * so we don't block the main winbindd and the validation
 375          * code can safely use fork/waitpid...
 376          */
 377         CatchChild();
 378         child_pid = sys_fork();
 379
 380         if (child_pid == -1) {
 381                 DEBUG(1, ("winbind_msg_validate_cache: Could not fork: %s\n",
 382                           strerror(errno)));
 383                 return;
 384         }
 385
 386         if (child_pid != 0) {
 387                 /* parent */
 388                 DEBUG(5, ("winbind_msg_validate_cache: child created with "
 389                           "pid %d.\n", child_pid));
 390                 return;
 391         }
 392
 393         /* child */
 394
 395         /* install default SIGCHLD handler: validation code uses fork/waitpid */
 396         ZERO_STRUCT(act);
 397         act.sa_handler = SIG_DFL;
 398 #ifdef SA_RESTART
 399         /* We *want* SIGALRM to interrupt a system call. */
 400         act.sa_flags = SA_RESTART;
 401 #endif
 402         sigemptyset(&act.sa_mask);
 403         sigaddset(&act.sa_mask,SIGCHLD);
 404         sigaction(SIGCHLD,&act,&oldact);
 405
 406         ret = (uint8)winbindd_validate_cache_nobackup();
 407         DEBUG(10, ("winbindd_msg_validata_cache: got return value %d\n", ret));
 408         messaging_send_buf(msg_ctx, server_id, MSG_WINBIND_VALIDATE_CACHE, &ret,
 409                            (size_t)1);
 410         _exit(0);
 411 }
 412
 413 static struct winbindd_dispatch_table {
 414         enum winbindd_cmd cmd;
 415         void (*fn)(struct winbindd_cli_state *state);
 416         const char *winbindd_cmd_name;
 417 } dispatch_table[] = {
 418
 419         /* User functions */
 420
 421         { WINBINDD_GETPWNAM, winbindd_getpwnam, "GETPWNAM" },
 422         { WINBINDD_GETPWUID, winbindd_getpwuid, "GETPWUID" },
 423
 424         { WINBINDD_SETPWENT, winbindd_setpwent, "SETPWENT" },
 425         { WINBINDD_ENDPWENT, winbindd_endpwent, "ENDPWENT" },
 426         { WINBINDD_GETPWENT, winbindd_getpwent, "GETPWENT" },
 427
 428         { WINBINDD_GETGROUPS, winbindd_getgroups, "GETGROUPS" },
 429         { WINBINDD_GETUSERSIDS, winbindd_getusersids, "GETUSERSIDS" },
 430         { WINBINDD_GETUSERDOMGROUPS, winbindd_getuserdomgroups,
 431           "GETUSERDOMGROUPS" },
 432
 433         /* Group functions */
 434
 435         { WINBINDD_GETGRNAM, winbindd_getgrnam, "GETGRNAM" },
 436         { WINBINDD_GETGRGID, winbindd_getgrgid, "GETGRGID" },
 437         { WINBINDD_SETGRENT, winbindd_setgrent, "SETGRENT" },
 438         { WINBINDD_ENDGRENT, winbindd_endgrent, "ENDGRENT" },
 439         { WINBINDD_GETGRENT, winbindd_getgrent, "GETGRENT" },
 440         { WINBINDD_GETGRLST, winbindd_getgrent, "GETGRLST" },
 441
 442         /* PAM auth functions */
 443
 444         { WINBINDD_PAM_AUTH, winbindd_pam_auth, "PAM_AUTH" },
 445         { WINBINDD_PAM_AUTH_CRAP, winbindd_pam_auth_crap, "AUTH_CRAP" },
 446         { WINBINDD_PAM_CHAUTHTOK, winbindd_pam_chauthtok, "CHAUTHTOK" },
 447         { WINBINDD_PAM_LOGOFF, winbindd_pam_logoff, "PAM_LOGOFF" },
 448         { WINBINDD_PAM_CHNG_PSWD_AUTH_CRAP, winbindd_pam_chng_pswd_auth_crap, "CHNG_PSWD_AUTH_CRAP" },
 449
 450         /* Enumeration functions */
 451
 452         { WINBINDD_LIST_USERS, winbindd_list_users, "LIST_USERS" },
 453         { WINBINDD_LIST_GROUPS, winbindd_list_groups, "LIST_GROUPS" },
 454         { WINBINDD_LIST_TRUSTDOM, winbindd_list_trusted_domains,
 455           "LIST_TRUSTDOM" },
 456         { WINBINDD_SHOW_SEQUENCE, winbindd_show_sequence, "SHOW_SEQUENCE" },
 457
 458         /* SID related functions */
 459
 460         { WINBINDD_LOOKUPSID, winbindd_lookupsid, "LOOKUPSID" },
 461         { WINBINDD_LOOKUPNAME, winbindd_lookupname, "LOOKUPNAME" },
 462         { WINBINDD_LOOKUPRIDS, winbindd_lookuprids, "LOOKUPRIDS" },
 463
 464         /* Lookup related functions */
 465
 466         { WINBINDD_SID_TO_UID, winbindd_sid_to_uid, "SID_TO_UID" },
 467         { WINBINDD_SID_TO_GID, winbindd_sid_to_gid, "SID_TO_GID" },
 468         { WINBINDD_UID_TO_SID, winbindd_uid_to_sid, "UID_TO_SID" },
 469         { WINBINDD_GID_TO_SID, winbindd_gid_to_sid, "GID_TO_SID" },
 470         { WINBINDD_ALLOCATE_UID, winbindd_allocate_uid, "ALLOCATE_UID" },
 471         { WINBINDD_ALLOCATE_GID, winbindd_allocate_gid, "ALLOCATE_GID" },
 472         { WINBINDD_SET_MAPPING, winbindd_set_mapping, "SET_MAPPING" },
 473         { WINBINDD_REMOVE_MAPPING, winbindd_remove_mapping, "REMOVE_MAPPING" },
 474         { WINBINDD_SET_HWM, winbindd_set_hwm, "SET_HWMS" },
 475
 476         /* Miscellaneous */
 477
 478         { WINBINDD_CHECK_MACHACC, winbindd_check_machine_acct, "CHECK_MACHACC" },
 479         { WINBINDD_PING, winbindd_ping, "PING" },
 480         { WINBINDD_INFO, winbindd_info, "INFO" },
 481         { WINBINDD_INTERFACE_VERSION, winbindd_interface_version,
 482           "INTERFACE_VERSION" },
 483         { WINBINDD_DOMAIN_NAME, winbindd_domain_name, "DOMAIN_NAME" },
 484         { WINBINDD_DOMAIN_INFO, winbindd_domain_info, "DOMAIN_INFO" },
 485         { WINBINDD_NETBIOS_NAME, winbindd_netbios_name, "NETBIOS_NAME" },
 486         { WINBINDD_PRIV_PIPE_DIR, winbindd_priv_pipe_dir,
 487           "WINBINDD_PRIV_PIPE_DIR" },
 488         { WINBINDD_GETDCNAME, winbindd_getdcname, "GETDCNAME" },
 489         { WINBINDD_DSGETDCNAME, winbindd_dsgetdcname, "DSGETDCNAME" },
 490
 491         /* Credential cache access */
 492         { WINBINDD_CCACHE_NTLMAUTH, winbindd_ccache_ntlm_auth, "NTLMAUTH" },
 493
 494         /* WINS functions */
 495
 496         { WINBINDD_WINS_BYNAME, winbindd_wins_byname, "WINS_BYNAME" },
 497         { WINBINDD_WINS_BYIP, winbindd_wins_byip, "WINS_BYIP" },
 498
 499         /* End of list */
 500
 501         { WINBINDD_NUM_CMDS, NULL, "NONE" }
 502 };
 503
 504 static void process_request(struct winbindd_cli_state *state)
 505 {
 506         struct winbindd_dispatch_table *table = dispatch_table;
 507
 508         /* Free response data - we may be interrupted and receive another
 509            command before being able to send this data off. */
 510
 511         SAFE_FREE(state->response.extra_data.data);
 512
 513         ZERO_STRUCT(state->response);
 514
 515         state->response.result = WINBINDD_PENDING;
 516         state->response.length = sizeof(struct winbindd_response);
 517
 518         state->mem_ctx = talloc_init("winbind request");
 519         if (state->mem_ctx == NULL)
 520                 return;
 521
 522         /* Remember who asked us. */
 523         state->pid = state->request.pid;
 524
 525         /* Process command */
 526
 527         for (table = dispatch_table; table->fn; table++) {
 528                 if (state->request.cmd == table->cmd) {
 529                         DEBUG(10,("process_request: request fn %s\n",
 530                                   table->winbindd_cmd_name ));
 531                         table->fn(state);
 532                         break;
 533                 }
 534         }
 535
 536         if (!table->fn) {
 537                 DEBUG(10,("process_request: unknown request fn number %d\n",
 538                           (int)state->request.cmd ));
 539                 request_error(state);
 540         }
 541 }
 542
 543 /*
 544  * A list of file descriptors being monitored by select in the main processing
 545  * loop. winbindd_fd_event->handler is called whenever the socket is readable/writable.
 546  */
 547
 548 static struct winbindd_fd_event *fd_events = NULL;
 549
 550 void add_fd_event(struct winbindd_fd_event *ev)
 551 {
 552         struct winbindd_fd_event *match;
 553
 554         /* only add unique winbindd_fd_event structs */
 555
 556         for (match=fd_events; match; match=match->next ) {
 557 #ifdef DEVELOPER
 558                 SMB_ASSERT( match != ev );
 559 #else
 560                 if ( match == ev )
 561                         return;
 562 #endif
 563         }
 564
 565         DLIST_ADD(fd_events, ev);
 566 }
 567
 568 void remove_fd_event(struct winbindd_fd_event *ev)
 569 {
 570         DLIST_REMOVE(fd_events, ev);
 571 }
 572
 573 /*
 574  * Handler for winbindd_fd_events to complete a read/write request, set up by
 575  * setup_async_read/setup_async_write.
 576  */
 577
 578 static void rw_callback(struct winbindd_fd_event *event, int flags)
 579 {
 580         size_t todo;
 581         ssize_t done = 0;
 582
 583         todo = event->length - event->done;
 584
 585         if (event->flags & EVENT_FD_WRITE) {
 586                 SMB_ASSERT(flags == EVENT_FD_WRITE);
 587                 done = sys_write(event->fd,
 588                                  &((char *)event->data)[event->done],
 589                                  todo);
 590
 591                 if (done <= 0) {
 592                         event->flags = 0;
 593                         event->finished(event->private_data, False);
 594                         return;
 595                 }
 596         }
 597
 598         if (event->flags & EVENT_FD_READ) {
 599                 SMB_ASSERT(flags == EVENT_FD_READ);
 600                 done = sys_read(event->fd, &((char *)event->data)[event->done],
 601                                 todo);
 602
 603                 if (done <= 0) {
 604                         event->flags = 0;
 605                         event->finished(event->private_data, False);
 606                         return;
 607                 }
 608         }
 609
 610         event->done += done;
 611
 612         if (event->done == event->length) {
 613                 event->flags = 0;
 614                 event->finished(event->private_data, True);
 615         }
 616 }
 617
 618 /*
 619  * Request an async read/write on a winbindd_fd_event structure. (*finished) is called
 620  * when the request is completed or an error had occurred.
 621  */
 622
 623 void setup_async_read(struct winbindd_fd_event *event, void *data, size_t length,
 624                       void (*finished)(void *private_data, bool success),
 625                       void *private_data)
 626 {
 627         SMB_ASSERT(event->flags == 0);
 628         event->data = data;
 629         event->length = length;
 630         event->done = 0;
 631         event->handler = rw_callback;
 632         event->finished = finished;
 633         event->private_data = private_data;
 634         event->flags = EVENT_FD_READ;
 635 }
 636
 637 void setup_async_write(struct winbindd_fd_event *event, void *data, size_t length,
 638                        void (*finished)(void *private_data, bool success),
 639                        void *private_data)
 640 {
 641         SMB_ASSERT(event->flags == 0);
 642         event->data = data;
 643         event->length = length;
 644         event->done = 0;
 645         event->handler = rw_callback;
 646         event->finished = finished;
 647         event->private_data = private_data;
 648         event->flags = EVENT_FD_WRITE;
 649 }
 650
 651 /*
 652  * This is the main event loop of winbind requests. It goes through a
 653  * state-machine of 3 read/write requests, 4 if you have extra data to send.
 654  *
 655  * An idle winbind client has a read request of 4 bytes outstanding,
 656  * finalizing function is request_len_recv, checking the length. request_recv
 657  * then processes the packet. The processing function then at some point has
 658  * to call request_finished which schedules sending the response.
 659  */
 660
 661 static void request_len_recv(void *private_data, bool success);
 662 static void request_recv(void *private_data, bool success);
 663 static void request_main_recv(void *private_data, bool success);
 664 static void request_finished(struct winbindd_cli_state *state);
 665 static void response_main_sent(void *private_data, bool success);
 666 static void response_extra_sent(void *private_data, bool success);
 667
 668 static void response_extra_sent(void *private_data, bool success)
 669 {
 670         struct winbindd_cli_state *state =
 671                 talloc_get_type_abort(private_data, struct winbindd_cli_state);
 672
 673         TALLOC_FREE(state->mem_ctx);
 674
 675         if (!success) {
 676                 state->finished = True;
 677                 return;
 678         }
 679
 680         SAFE_FREE(state->response.extra_data.data);
 681
 682         setup_async_read(&state->fd_event, &state->request, sizeof(uint32),
 683                          request_len_recv, state);
 684 }
 685
 686 static void response_main_sent(void *private_data, bool success)
 687 {
 688         struct winbindd_cli_state *state =
 689                 talloc_get_type_abort(private_data, struct winbindd_cli_state);
 690
 691         if (!success) {
 692                 state->finished = True;
 693                 return;
 694         }
 695
 696         if (state->response.length == sizeof(state->response)) {
 697                 TALLOC_FREE(state->mem_ctx);
 698
 699                 setup_async_read(&state->fd_event, &state->request,
 700                                  sizeof(uint32), request_len_recv, state);
 701                 return;
 702         }
 703
 704         setup_async_write(&state->fd_event, state->response.extra_data.data,
 705                           state->response.length - sizeof(state->response),
 706                           response_extra_sent, state);
 707 }
 708
 709 static void request_finished(struct winbindd_cli_state *state)
 710 {
 711         /* Make sure request.extra_data is freed when finish processing a request */
 712         SAFE_FREE(state->request.extra_data.data);
 713         setup_async_write(&state->fd_event, &state->response,
 714                           sizeof(state->response), response_main_sent, state);
 715 }
 716
 717 void request_error(struct winbindd_cli_state *state)
 718 {
 719         SMB_ASSERT(state->response.result == WINBINDD_PENDING);
 720         state->response.result = WINBINDD_ERROR;
 721         request_finished(state);
 722 }
 723
 724 void request_ok(struct winbindd_cli_state *state)
 725 {
 726         SMB_ASSERT(state->response.result == WINBINDD_PENDING);
 727         state->response.result = WINBINDD_OK;
 728         request_finished(state);
 729 }
 730
 731 static void request_len_recv(void *private_data, bool success)
 732 {
 733         struct winbindd_cli_state *state =
 734                 talloc_get_type_abort(private_data, struct winbindd_cli_state);
 735
 736         if (!success) {
 737                 state->finished = True;
 738                 return;
 739         }
 740
 741         if (*(uint32 *)(&state->request) != sizeof(state->request)) {
 742                 DEBUG(0,("request_len_recv: Invalid request size received: %d (expected %u)\n",
 743                          *(uint32_t *)(&state->request), (uint32_t)sizeof(state->request)));
 744                 state->finished = True;
 745                 return;
 746         }
 747
 748         setup_async_read(&state->fd_event, (uint32 *)(&state->request)+1,
 749                          sizeof(state->request) - sizeof(uint32),
 750                          request_main_recv, state);
 751 }
 752
 753 static void request_main_recv(void *private_data, bool success)
 754 {
 755         struct winbindd_cli_state *state =
 756                 talloc_get_type_abort(private_data, struct winbindd_cli_state);
 757
 758         if (!success) {
 759                 state->finished = True;
 760                 return;
 761         }
 762
 763         if (state->request.extra_len == 0) {
 764                 state->request.extra_data.data = NULL;
 765                 request_recv(state, True);
 766                 return;
 767         }
 768
 769         if ((!state->privileged) &&
 770             (state->request.extra_len > WINBINDD_MAX_EXTRA_DATA)) {
 771                 DEBUG(3, ("Got request with %d bytes extra data on "
 772                           "unprivileged socket\n", (int)state->request.extra_len));
 773                 state->request.extra_data.data = NULL;
 774                 state->finished = True;
 775                 return;
 776         }
 777
 778         state->request.extra_data.data =
 779                 SMB_MALLOC_ARRAY(char, state->request.extra_len + 1);
 780
 781         if (state->request.extra_data.data == NULL) {
 782                 DEBUG(0, ("malloc failed\n"));
 783                 state->finished = True;
 784                 return;
 785         }
 786
 787         /* Ensure null termination */
 788         state->request.extra_data.data[state->request.extra_len] = '\0';
 789
 790         setup_async_read(&state->fd_event, state->request.extra_data.data,
 791                          state->request.extra_len, request_recv, state);
 792 }
 793
 794 static void request_recv(void *private_data, bool success)
 795 {
 796         struct winbindd_cli_state *state =
 797                 talloc_get_type_abort(private_data, struct winbindd_cli_state);
 798
 799         if (!success) {
 800                 state->finished = True;
 801                 return;
 802         }
 803
 804         process_request(state);
 805 }
 806
 807 /* Process a new connection by adding it to the client connection list */
 808
 809 static void new_connection(int listen_sock, bool privileged)
 810 {
 811         struct sockaddr_un sunaddr;
 812         struct winbindd_cli_state *state;
 813         socklen_t len;
 814         int sock;
 815
 816         /* Accept connection */
 817
 818         len = sizeof(sunaddr);
 819
 820         do {
 821                 sock = accept(listen_sock, (struct sockaddr *)&sunaddr, &len);
 822         } while (sock == -1 && errno == EINTR);
 823
 824         if (sock == -1)
 825                 return;
 826
 827         DEBUG(6,("accepted socket %d\n", sock));
 828
 829         /* Create new connection structure */
 830
 831         if ((state = TALLOC_ZERO_P(NULL, struct winbindd_cli_state)) == NULL) {
 832                 close(sock);
 833                 return;
 834         }
 835
 836         state->sock = sock;
 837
 838         state->last_access = time(NULL);
 839
 840         state->privileged = privileged;
 841
 842         state->fd_event.fd = state->sock;
 843         state->fd_event.flags = 0;
 844         add_fd_event(&state->fd_event);
 845
 846         setup_async_read(&state->fd_event, &state->request, sizeof(uint32),
 847                          request_len_recv, state);
 848
 849         /* Add to connection list */
 850
 851         winbindd_add_client(state);
 852 }
 853
 854 /* Remove a client connection from client connection list */
 855
 856 static void remove_client(struct winbindd_cli_state *state)
 857 {
 858         char c = 0;
 859         int nwritten;
 860
 861         /* It's a dead client - hold a funeral */
 862
 863         if (state == NULL) {
 864                 return;
 865         }
 866
 867         /* tell client, we are closing ... */
 868         nwritten = write(state->sock, &c, sizeof(c));
 869         if (nwritten == -1) {
 870                 DEBUG(2, ("final write to client failed: %s\n",
 871                           strerror(errno)));
 872         }
 873
 874         /* Close socket */
 875
 876         close(state->sock);
 877
 878         /* Free any getent state */
 879
 880         free_getent_state(state->getpwent_state);
 881         free_getent_state(state->getgrent_state);
 882
 883         /* We may have some extra data that was not freed if the client was
 884            killed unexpectedly */
 885
 886         SAFE_FREE(state->response.extra_data.data);
 887
 888         TALLOC_FREE(state->mem_ctx);
 889
 890         remove_fd_event(&state->fd_event);
 891
 892         /* Remove from list and free */
 893
 894         winbindd_remove_client(state);
 895         TALLOC_FREE(state);
 896 }
 897
 898 /* Shutdown client connection which has been idle for the longest time */
 899
 900 static bool remove_idle_client(void)
 901 {
 902         struct winbindd_cli_state *state, *remove_state = NULL;
 903         time_t last_access = 0;
 904         int nidle = 0;
 905
 906         for (state = winbindd_client_list(); state; state = state->next) {
 907                 if (state->response.result != WINBINDD_PENDING &&
 908                     !state->getpwent_state && !state->getgrent_state) {
 909                         nidle++;
 910                         if (!last_access || state->last_access < last_access) {
 911                                 last_access = state->last_access;
 912                                 remove_state = state;
 913                         }
 914                 }
 915         }
 916
 917         if (remove_state) {
 918                 DEBUG(5,("Found %d idle client connections, shutting down sock %d, pid %u\n",
 919                         nidle, remove_state->sock, (unsigned int)remove_state->pid));
 920                 remove_client(remove_state);
 921                 return True;
 922         }
 923
 924         return False;
 925 }
 926
 927 /* Process incoming clients on listen_sock.  We use a tricky non-blocking,
 928    non-forking, non-threaded model which allows us to handle many
 929    simultaneous connections while remaining impervious to many denial of
 930    service attacks. */
 931
 932 static void process_loop(void)
 933 {
 934         struct winbindd_cli_state *state;
 935         struct winbindd_fd_event *ev;
 936         fd_set r_fds, w_fds;
 937         int maxfd, listen_sock, listen_priv_sock, selret;
 938         struct timeval timeout, ev_timeout;
 939
 940         /* Open Sockets here to get stuff going ASAP */
 941         listen_sock = open_winbindd_socket();
 942         listen_priv_sock = open_winbindd_priv_socket();
 943
 944         if (listen_sock == -1 || listen_priv_sock == -1) {
 945                 perror("open_winbind_socket");
 946                 exit(1);
 947         }
 948
 949         run_events(winbind_event_context(), 0, NULL, NULL);
 950
 951         /* refresh the trusted domain cache */
 952
 953         rescan_trusted_domains();
 954
 955         /* Initialise fd lists for select() */
 956
 957         maxfd = MAX(listen_sock, listen_priv_sock);
 958
 959         FD_ZERO(&r_fds);
 960         FD_ZERO(&w_fds);
 961         FD_SET(listen_sock, &r_fds);
 962         FD_SET(listen_priv_sock, &r_fds);
 963
 964         timeout.tv_sec = WINBINDD_ESTABLISH_LOOP;
 965         timeout.tv_usec = 0;
 966
 967         /* Check for any event timeouts. */
 968         {
 969                 struct timeval now;
 970                 GetTimeOfDay(&now);
 971
 972                 event_add_to_select_args(winbind_event_context(), &now,
 973                                          &r_fds, &w_fds, &ev_timeout, &maxfd);
 974         }
 975         if (get_timed_events_timeout(winbind_event_context(), &ev_timeout)) {
 976                 timeout = timeval_min(&timeout, &ev_timeout);
 977         }
 978
 979         /* Set up client readers and writers */
 980
 981         state = winbindd_client_list();
 982
 983         while (state) {
 984
 985                 struct winbindd_cli_state *next = state->next;
 986
 987                 /* Dispose of client connection if it is marked as
 988                    finished */
 989
 990                 if (state->finished)
 991                         remove_client(state);
 992
 993                 state = next;
 994         }
 995
 996         for (ev = fd_events; ev; ev = ev->next) {
 997                 if (ev->flags & EVENT_FD_READ) {
 998                         FD_SET(ev->fd, &r_fds);
 999                         maxfd = MAX(ev->fd, maxfd);
1000                 }
1001                 if (ev->flags & EVENT_FD_WRITE) {
1002                         FD_SET(ev->fd, &w_fds);
1003                         maxfd = MAX(ev->fd, maxfd);
1004                 }
1005         }
1006
1007         /* Call select */
1008
1009         selret = sys_select(maxfd + 1, &r_fds, &w_fds, NULL, &timeout);
1010
1011         if (selret == 0) {
1012                 goto no_fds_ready;
1013         }
1014
1015         if (selret == -1) {
1016                 if (errno == EINTR) {
1017                         goto no_fds_ready;
1018                 }
1019
1020                 /* Select error, something is badly wrong */
1021
1022                 perror("select");
1023                 exit(1);
1024         }
1025
1026         /* selret > 0 */
1027
1028         run_events(winbind_event_context(), selret, &r_fds, &w_fds);
1029
1030         ev = fd_events;
1031         while (ev != NULL) {
1032                 struct winbindd_fd_event *next = ev->next;
1033                 int flags = 0;
1034                 if (FD_ISSET(ev->fd, &r_fds))
1035                         flags |= EVENT_FD_READ;
1036                 if (FD_ISSET(ev->fd, &w_fds))
1037                         flags |= EVENT_FD_WRITE;
1038                 if (flags)
1039                         ev->handler(ev, flags);
1040                 ev = next;
1041         }
1042
1043         if (FD_ISSET(listen_sock, &r_fds)) {
1044                 while (winbindd_num_clients() >
1045                        WINBINDD_MAX_SIMULTANEOUS_CLIENTS - 1) {
1046                         DEBUG(5,("winbindd: Exceeding %d client "
1047                                  "connections, removing idle "
1048                                  "connection.\n",
1049                                  WINBINDD_MAX_SIMULTANEOUS_CLIENTS));
1050                         if (!remove_idle_client()) {
1051                                 DEBUG(0,("winbindd: Exceeding %d "
1052                                          "client connections, no idle "
1053                                          "connection found\n",
1054                                          WINBINDD_MAX_SIMULTANEOUS_CLIENTS));
1055                                 break;
1056                         }
1057                 }
1058                 /* new, non-privileged connection */
1059                 new_connection(listen_sock, False);
1060         }
1061
1062         if (FD_ISSET(listen_priv_sock, &r_fds)) {
1063                 while (winbindd_num_clients() >
1064                        WINBINDD_MAX_SIMULTANEOUS_CLIENTS - 1) {
1065                         DEBUG(5,("winbindd: Exceeding %d client "
1066                                  "connections, removing idle "
1067                                  "connection.\n",
1068                                  WINBINDD_MAX_SIMULTANEOUS_CLIENTS));
1069                         if (!remove_idle_client()) {
1070                                 DEBUG(0,("winbindd: Exceeding %d "
1071                                          "client connections, no idle "
1072                                          "connection found\n",
1073                                          WINBINDD_MAX_SIMULTANEOUS_CLIENTS));
1074                                 break;
1075                         }
1076                 }
1077                 /* new, privileged connection */
1078                 new_connection(listen_priv_sock, True);
1079         }
1080
1081  no_fds_ready:
1082
1083         run_events(winbind_event_context(), selret, &r_fds, &w_fds);
1084
1085 #if 0
1086         winbindd_check_cache_size(time(NULL));
1087 #endif
1088 }
1089
1090 /* Main function */
1091
1092 int main(int argc, char **argv, char **envp)
1093 {
1094         static bool is_daemon = False;
1095         static bool Fork = True;
1096         static bool log_stdout = False;
1097         static bool no_process_group = False;
1098         enum {
1099                 OPT_DAEMON = 1000,
1100                 OPT_FORK,
1101                 OPT_NO_PROCESS_GROUP,
1102                 OPT_LOG_STDOUT
1103         };
1104         struct poptOption long_options[] = {
1105                 POPT_AUTOHELP
1106                 { "stdout", 'S', POPT_ARG_NONE, NULL, OPT_LOG_STDOUT, "Log to stdout" },
1107                 { "foreground", 'F', POPT_ARG_NONE, NULL, OPT_FORK, "Daemon in foreground mode" },
1108                 { "no-process-group", 0, POPT_ARG_NONE, NULL, OPT_NO_PROCESS_GROUP, "Don't create a new process group" },
1109                 { "daemon", 'D', POPT_ARG_NONE, NULL, OPT_DAEMON, "Become a daemon (default)" },
1110                 { "interactive", 'i', POPT_ARG_NONE, NULL, 'i', "Interactive mode" },
1111                 { "no-caching", 'n', POPT_ARG_NONE, NULL, 'n', "Disable caching" },
1112                 POPT_COMMON_SAMBA
1113                 POPT_TABLEEND
1114         };
1115         poptContext pc;
1116         int opt;
1117         TALLOC_CTX *frame = talloc_stackframe();
1118
1119         /* glibc (?) likes to print "User defined signal 1" and exit if a
1120            SIGUSR[12] is received before a handler is installed */
1121
1122         CatchSignal(SIGUSR1, SIG_IGN);
1123         CatchSignal(SIGUSR2, SIG_IGN);
1124
1125         fault_setup((void (*)(void *))fault_quit );
1126         dump_core_setup("winbindd");
1127
1128         load_case_tables();
1129
1130         /* Initialise for running in non-root mode */
1131
1132         sec_init();
1133
1134         set_remote_machine_name("winbindd", False);
1135
1136         /* Set environment variable so we don't recursively call ourselves.
1137            This may also be useful interactively. */
1138
1139         if ( !winbind_off() ) {
1140                 DEBUG(0,("Failed to disable recusive winbindd calls.  Exiting.\n"));
1141                 exit(1);
1142         }
1143
1144         /* Initialise samba/rpc client stuff */
1145
1146         pc = poptGetContext("winbindd", argc, (const char **)argv, long_options, 0);
1147
1148         while ((opt = poptGetNextOpt(pc)) != -1) {
1149                 switch (opt) {
1150                         /* Don't become a daemon */
1151                 case OPT_DAEMON:
1152                         is_daemon = True;
1153                         break;
1154                 case 'i':
1155                         interactive = True;
1156                         log_stdout = True;
1157                         Fork = False;
1158                         break;
1159                 case OPT_FORK:
1160                         Fork = false;
1161                         break;
1162                 case OPT_NO_PROCESS_GROUP:
1163                         no_process_group = true;
1164                         break;
1165                 case OPT_LOG_STDOUT:
1166                         log_stdout = true;
1167                         break;
1168                 case 'n':
1169                         opt_nocache = true;
1170                         break;
1171                 default:
1172                         d_fprintf(stderr, "\nInvalid option %s: %s\n\n",
1173                                   poptBadOption(pc, 0), poptStrerror(opt));
1174                         poptPrintUsage(pc, stderr, 0);
1175                         exit(1);
1176                 }
1177         }
1178
1179         if (is_daemon && interactive) {
1180                 d_fprintf(stderr,"\nERROR: "
1181                           "Option -i|--interactive is not allowed together with -D|--daemon\n\n");
1182                 poptPrintUsage(pc, stderr, 0);
1183                 exit(1);
1184         }
1185
1186         if (log_stdout && Fork) {
1187                 d_fprintf(stderr, "\nERROR: "
1188                           "Can't log to stdout (-S) unless daemon is in foreground +(-F) or interactive (-i)\n\n");
1189                 poptPrintUsage(pc, stderr, 0);
1190                 exit(1);
1191         }
1192
1193         poptFreeContext(pc);
1194
1195         if (!override_logfile) {
1196                 char *lfile = NULL;
1197                 if (asprintf(&lfile,"%s/log.winbindd",
1198                                 get_dyn_LOGFILEBASE()) > 0) {
1199                         lp_set_logfile(lfile);
1200                         SAFE_FREE(lfile);
1201                 }
1202         }
1203         setup_logging("winbindd", log_stdout);
1204         reopen_logs();
1205
1206         DEBUG(0,("winbindd version %s started.\n", samba_version_string()));
1207         DEBUGADD(0,("%s\n", COPYRIGHT_STARTUP_MESSAGE));
1208
1209         if (!lp_load_initial_only(get_dyn_CONFIGFILE())) {
1210                 DEBUG(0, ("error opening config file\n"));
1211                 exit(1);
1212         }
1213
1214         /* Initialise messaging system */
1215
1216         if (winbind_messaging_context() == NULL) {
1217                 exit(1);
1218         }
1219
1220         if (!reload_services_file(NULL)) {
1221                 DEBUG(0, ("error opening config file\n"));
1222                 exit(1);
1223         }
1224
1225         if (!directory_exist(lp_lockdir())) {
1226                 mkdir(lp_lockdir(), 0755);
1227         }
1228
1229         /* Setup names. */
1230
1231         if (!init_names())
1232                 exit(1);
1233
1234         load_interfaces();
1235
1236         if (!secrets_init()) {
1237
1238                 DEBUG(0,("Could not initialize domain trust account secrets. Giving up\n"));
1239                 return False;
1240         }
1241
1242         /* Enable netbios namecache */
1243
1244         namecache_enable();
1245
1246         /* Unblock all signals we are interested in as they may have been
1247            blocked by the parent process. */
1248
1249         BlockSignals(False, SIGINT);
1250         BlockSignals(False, SIGQUIT);
1251         BlockSignals(False, SIGTERM);
1252         BlockSignals(False, SIGUSR1);
1253         BlockSignals(False, SIGUSR2);
1254         BlockSignals(False, SIGHUP);
1255         BlockSignals(False, SIGCHLD);
1256
1257         if (!interactive)
1258                 become_daemon(Fork, no_process_group);
1259
1260         pidfile_create("winbindd");
1261
1262 #if HAVE_SETPGID
1263         /*
1264          * If we're interactive we want to set our own process group for
1265          * signal management.
1266          */
1267         if (interactive && !no_process_group)
1268                 setpgid( (pid_t)0, (pid_t)0);
1269 #endif
1270
1271         TimeInit();
1272
1273         /* Don't use winbindd_reinit_after_fork here as
1274          * we're just starting up and haven't created any
1275          * winbindd-specific resources we must free yet. JRA.
1276          */
1277
1278         if (!reinit_after_fork(winbind_messaging_context(),
1279                                winbind_event_context(), false)) {
1280                 DEBUG(0,("reinit_after_fork() failed\n"));
1281                 exit(1);
1282         }
1283
1284         /* Setup signal handlers */
1285
1286         if (!winbindd_setup_sig_term_handler(true))
1287                 exit(1);
1288         if (!winbindd_setup_sig_hup_handler(NULL))
1289                 exit(1);
1290         if (!winbindd_setup_sig_chld_handler())
1291                 exit(1);
1292         if (!winbindd_setup_sig_usr2_handler())
1293                 exit(1);
1294
1295         CatchSignal(SIGPIPE, SIG_IGN);                 /* Ignore sigpipe */
1296
1297         /*
1298          * Ensure all cache and idmap caches are consistent
1299          * and initialized before we startup.
1300          */
1301         if (!winbindd_cache_validate_and_initialize()) {
1302                 exit(1);
1303         }
1304
1305         /* get broadcast messages */
1306         claim_connection(NULL,"",FLAG_MSG_GENERAL|FLAG_MSG_DBWRAP);
1307
1308         /* React on 'smbcontrol winbindd reload-config' in the same way
1309            as to SIGHUP signal */
1310         messaging_register(winbind_messaging_context(), NULL,
1311                            MSG_SMB_CONF_UPDATED, msg_reload_services);
1312         messaging_register(winbind_messaging_context(), NULL,
1313                            MSG_SHUTDOWN, msg_shutdown);
1314
1315         /* Handle online/offline messages. */
1316         messaging_register(winbind_messaging_context(), NULL,
1317                            MSG_WINBIND_OFFLINE, winbind_msg_offline);
1318         messaging_register(winbind_messaging_context(), NULL,
1319                            MSG_WINBIND_ONLINE, winbind_msg_online);
1320         messaging_register(winbind_messaging_context(), NULL,
1321                            MSG_WINBIND_ONLINESTATUS, winbind_msg_onlinestatus);
1322
1323         messaging_register(winbind_messaging_context(), NULL,
1324                            MSG_DUMP_EVENT_LIST, winbind_msg_dump_event_list);
1325
1326         messaging_register(winbind_messaging_context(), NULL,
1327                            MSG_WINBIND_VALIDATE_CACHE,
1328                            winbind_msg_validate_cache);
1329
1330         messaging_register(winbind_messaging_context(), NULL,
1331                            MSG_WINBIND_DUMP_DOMAIN_LIST,
1332                            winbind_msg_dump_domain_list);
1333
1334         /* Register handler for MSG_DEBUG. */
1335         messaging_register(winbind_messaging_context(), NULL,
1336                            MSG_DEBUG,
1337                            winbind_msg_debug);
1338
1339         netsamlogon_cache_init(); /* Non-critical */
1340
1341         /* clear the cached list of trusted domains */
1342
1343         wcache_tdc_clear();
1344
1345         if (!init_domain_list()) {
1346                 DEBUG(0,("unable to initialize domain list\n"));
1347                 exit(1);
1348         }
1349
1350         init_idmap_child();
1351         init_locator_child();
1352
1353         smb_nscd_flush_user_cache();
1354         smb_nscd_flush_group_cache();
1355
1356         /* Loop waiting for requests */
1357
1358         TALLOC_FREE(frame);
1359         while (1) {
1360                 frame = talloc_stackframe();
1361                 process_loop();
1362                 TALLOC_FREE(frame);
1363         }
1364
1365         return 0;
1366 }