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 #include "../../nsswitch/libwbclient/wbc_async.h"
  28
  29 #undef DBGC_CLASS
  30 #define DBGC_CLASS DBGC_WINBIND
  31
  32 static bool opt_nocache = False;
  33 static bool interactive = False;
  34
  35 extern bool override_logfile;
  36
  37 struct event_context *winbind_event_context(void)
  38 {
  39         static struct event_context *ctx;
  40
  41         if (!ctx && !(ctx = event_context_init(NULL))) {
  42                 smb_panic("Could not init winbind event context");
  43         }
  44         return ctx;
  45 }
  46
  47 struct messaging_context *winbind_messaging_context(void)
  48 {
  49         static struct messaging_context *ctx;
  50
  51         if (ctx == NULL) {
  52                 ctx = messaging_init(NULL, server_id_self(),
  53                                      winbind_event_context());
  54         }
  55         if (ctx == NULL) {
  56                 DEBUG(0, ("Could not init winbind messaging context.\n"));
  57         }
  58         return ctx;
  59 }
  60
  61 /* Reload configuration */
  62
  63 static bool reload_services_file(const char *lfile)
  64 {
  65         bool ret;
  66
  67         if (lp_loaded()) {
  68                 const char *fname = lp_configfile();
  69
  70                 if (file_exist(fname) && !strcsequal(fname,get_dyn_CONFIGFILE())) {
  71                         set_dyn_CONFIGFILE(fname);
  72                 }
  73         }
  74
  75         /* if this is a child, restore the logfile to the special
  76            name - <domain>, idmap, etc. */
  77         if (lfile && *lfile) {
  78                 lp_set_logfile(lfile);
  79         }
  80
  81         reopen_logs();
  82         ret = lp_load(get_dyn_CONFIGFILE(),False,False,True,True);
  83
  84         reopen_logs();
  85         load_interfaces();
  86
  87         return(ret);
  88 }
  89
  90
  91 /**************************************************************************** **
  92  Handle a fault..
  93  **************************************************************************** */
  94
  95 static void fault_quit(void)
  96 {
  97         dump_core();
  98 }
  99
 100 static void winbindd_status(void)
 101 {
 102         struct winbindd_cli_state *tmp;
 103
 104         DEBUG(0, ("winbindd status:\n"));
 105
 106         /* Print client state information */
 107
 108         DEBUG(0, ("\t%d clients currently active\n", winbindd_num_clients()));
 109
 110         if (DEBUGLEVEL >= 2 && winbindd_num_clients()) {
 111                 DEBUG(2, ("\tclient list:\n"));
 112                 for(tmp = winbindd_client_list(); tmp; tmp = tmp->next) {
 113                         DEBUGADD(2, ("\t\tpid %lu, sock %d\n",
 114                                   (unsigned long)tmp->pid, tmp->sock));
 115                 }
 116         }
 117 }
 118
 119 /* Print winbindd status to log file */
 120
 121 static void print_winbindd_status(void)
 122 {
 123         winbindd_status();
 124 }
 125
 126 /* Flush client cache */
 127
 128 static void flush_caches(void)
 129 {
 130         /* We need to invalidate cached user list entries on a SIGHUP
 131            otherwise cached access denied errors due to restrict anonymous
 132            hang around until the sequence number changes. */
 133
 134         if (!wcache_invalidate_cache()) {
 135                 DEBUG(0, ("invalidating the cache failed; revalidate the cache\n"));
 136                 if (!winbindd_cache_validate_and_initialize()) {
 137                         exit(1);
 138                 }
 139         }
 140 }
 141
 142 /* Handle the signal by unlinking socket and exiting */
 143
 144 static void terminate(bool is_parent)
 145 {
 146         if (is_parent) {
 147                 /* When parent goes away we should
 148                  * remove the socket file. Not so
 149                  * when children terminate.
 150                  */
 151                 char *path = NULL;
 152
 153                 if (asprintf(&path, "%s/%s",
 154                         get_winbind_pipe_dir(), WINBINDD_SOCKET_NAME) > 0) {
 155                         unlink(path);
 156                         SAFE_FREE(path);
 157                 }
 158         }
 159
 160         idmap_close();
 161
 162         trustdom_cache_shutdown();
 163
 164 #if 0
 165         if (interactive) {
 166                 TALLOC_CTX *mem_ctx = talloc_init("end_description");
 167                 char *description = talloc_describe_all(mem_ctx);
 168
 169                 DEBUG(3, ("tallocs left:\n%s\n", description));
 170                 talloc_destroy(mem_ctx);
 171         }
 172 #endif
 173
 174         exit(0);
 175 }
 176
 177 static void winbindd_sig_term_handler(struct tevent_context *ev,
 178                                       struct tevent_signal *se,
 179                                       int signum,
 180                                       int count,
 181                                       void *siginfo,
 182                                       void *private_data)
 183 {
 184         bool *is_parent = talloc_get_type_abort(private_data, bool);
 185
 186         DEBUG(0,("Got sig[%d] terminate (is_parent=%d)\n",
 187                  signum, (int)*is_parent));
 188         terminate(*is_parent);
 189 }
 190
 191 bool winbindd_setup_sig_term_handler(bool parent)
 192 {
 193         struct tevent_signal *se;
 194         bool *is_parent;
 195
 196         is_parent = talloc(winbind_event_context(), bool);
 197         if (!is_parent) {
 198                 return false;
 199         }
 200
 201         *is_parent = parent;
 202
 203         se = tevent_add_signal(winbind_event_context(),
 204                                is_parent,
 205                                SIGTERM, 0,
 206                                winbindd_sig_term_handler,
 207                                is_parent);
 208         if (!se) {
 209                 DEBUG(0,("failed to setup SIGTERM handler"));
 210                 talloc_free(is_parent);
 211                 return false;
 212         }
 213
 214         se = tevent_add_signal(winbind_event_context(),
 215                                is_parent,
 216                                SIGINT, 0,
 217                                winbindd_sig_term_handler,
 218                                is_parent);
 219         if (!se) {
 220                 DEBUG(0,("failed to setup SIGINT handler"));
 221                 talloc_free(is_parent);
 222                 return false;
 223         }
 224
 225         se = tevent_add_signal(winbind_event_context(),
 226                                is_parent,
 227                                SIGQUIT, 0,
 228                                winbindd_sig_term_handler,
 229                                is_parent);
 230         if (!se) {
 231                 DEBUG(0,("failed to setup SIGINT handler"));
 232                 talloc_free(is_parent);
 233                 return false;
 234         }
 235
 236         return true;
 237 }
 238
 239 static void winbindd_sig_hup_handler(struct tevent_context *ev,
 240                                      struct tevent_signal *se,
 241                                      int signum,
 242                                      int count,
 243                                      void *siginfo,
 244                                      void *private_data)
 245 {
 246         const char *file = (const char *)private_data;
 247
 248         DEBUG(1,("Reloading services after SIGHUP\n"));
 249         flush_caches();
 250         reload_services_file(file);
 251 }
 252
 253 bool winbindd_setup_sig_hup_handler(const char *lfile)
 254 {
 255         struct tevent_signal *se;
 256         char *file = NULL;
 257
 258         if (lfile) {
 259                 file = talloc_strdup(winbind_event_context(),
 260                                      lfile);
 261                 if (!file) {
 262                         return false;
 263                 }
 264         }
 265
 266         se = tevent_add_signal(winbind_event_context(),
 267                                winbind_event_context(),
 268                                SIGHUP, 0,
 269                                winbindd_sig_hup_handler,
 270                                file);
 271         if (!se) {
 272                 return false;
 273         }
 274
 275         return true;
 276 }
 277
 278 static void winbindd_sig_chld_handler(struct tevent_context *ev,
 279                                       struct tevent_signal *se,
 280                                       int signum,
 281                                       int count,
 282                                       void *siginfo,
 283                                       void *private_data)
 284 {
 285         pid_t pid;
 286
 287         while ((pid = sys_waitpid(-1, NULL, WNOHANG)) > 0) {
 288                 winbind_child_died(pid);
 289         }
 290 }
 291
 292 static bool winbindd_setup_sig_chld_handler(void)
 293 {
 294         struct tevent_signal *se;
 295
 296         se = tevent_add_signal(winbind_event_context(),
 297                                winbind_event_context(),
 298                                SIGCHLD, 0,
 299                                winbindd_sig_chld_handler,
 300                                NULL);
 301         if (!se) {
 302                 return false;
 303         }
 304
 305         return true;
 306 }
 307
 308 static void winbindd_sig_usr2_handler(struct tevent_context *ev,
 309                                       struct tevent_signal *se,
 310                                       int signum,
 311                                       int count,
 312                                       void *siginfo,
 313                                       void *private_data)
 314 {
 315         print_winbindd_status();
 316 }
 317
 318 static bool winbindd_setup_sig_usr2_handler(void)
 319 {
 320         struct tevent_signal *se;
 321
 322         se = tevent_add_signal(winbind_event_context(),
 323                                winbind_event_context(),
 324                                SIGUSR2, 0,
 325                                winbindd_sig_usr2_handler,
 326                                NULL);
 327         if (!se) {
 328                 return false;
 329         }
 330
 331         return true;
 332 }
 333
 334 /* React on 'smbcontrol winbindd reload-config' in the same way as on SIGHUP*/
 335 static void msg_reload_services(struct messaging_context *msg,
 336                                 void *private_data,
 337                                 uint32_t msg_type,
 338                                 struct server_id server_id,
 339                                 DATA_BLOB *data)
 340 {
 341         /* Flush various caches */
 342         flush_caches();
 343         reload_services_file((const char *) private_data);
 344 }
 345
 346 /* React on 'smbcontrol winbindd shutdown' in the same way as on SIGTERM*/
 347 static void msg_shutdown(struct messaging_context *msg,
 348                          void *private_data,
 349                          uint32_t msg_type,
 350                          struct server_id server_id,
 351                          DATA_BLOB *data)
 352 {
 353         /* only the parent waits for this message */
 354         DEBUG(0,("Got shutdown message\n"));
 355         terminate(true);
 356 }
 357
 358
 359 static void winbind_msg_validate_cache(struct messaging_context *msg_ctx,
 360                                        void *private_data,
 361                                        uint32_t msg_type,
 362                                        struct server_id server_id,
 363                                        DATA_BLOB *data)
 364 {
 365         uint8 ret;
 366         pid_t child_pid;
 367         struct sigaction act;
 368         struct sigaction oldact;
 369
 370         DEBUG(10, ("winbindd_msg_validate_cache: got validate-cache "
 371                    "message.\n"));
 372
 373         /*
 374          * call the validation code from a child:
 375          * so we don't block the main winbindd and the validation
 376          * code can safely use fork/waitpid...
 377          */
 378         CatchChild();
 379         child_pid = sys_fork();
 380
 381         if (child_pid == -1) {
 382                 DEBUG(1, ("winbind_msg_validate_cache: Could not fork: %s\n",
 383                           strerror(errno)));
 384                 return;
 385         }
 386
 387         if (child_pid != 0) {
 388                 /* parent */
 389                 DEBUG(5, ("winbind_msg_validate_cache: child created with "
 390                           "pid %d.\n", (int)child_pid));
 391                 return;
 392         }
 393
 394         /* child */
 395
 396         /* install default SIGCHLD handler: validation code uses fork/waitpid */
 397         ZERO_STRUCT(act);
 398         act.sa_handler = SIG_DFL;
 399 #ifdef SA_RESTART
 400         /* We *want* SIGALRM to interrupt a system call. */
 401         act.sa_flags = SA_RESTART;
 402 #endif
 403         sigemptyset(&act.sa_mask);
 404         sigaddset(&act.sa_mask,SIGCHLD);
 405         sigaction(SIGCHLD,&act,&oldact);
 406
 407         ret = (uint8)winbindd_validate_cache_nobackup();
 408         DEBUG(10, ("winbindd_msg_validata_cache: got return value %d\n", ret));
 409         messaging_send_buf(msg_ctx, server_id, MSG_WINBIND_VALIDATE_CACHE, &ret,
 410                            (size_t)1);
 411         _exit(0);
 412 }
 413
 414 static struct winbindd_dispatch_table {
 415         enum winbindd_cmd cmd;
 416         void (*fn)(struct winbindd_cli_state *state);
 417         const char *winbindd_cmd_name;
 418 } dispatch_table[] = {
 419
 420         /* User functions */
 421
 422         { WINBINDD_GETPWNAM, winbindd_getpwnam, "GETPWNAM" },
 423         { WINBINDD_GETPWUID, winbindd_getpwuid, "GETPWUID" },
 424         { WINBINDD_GETPWSID, winbindd_getpwsid, "GETPWSID" },
 425
 426         { WINBINDD_SETPWENT, winbindd_setpwent, "SETPWENT" },
 427         { WINBINDD_ENDPWENT, winbindd_endpwent, "ENDPWENT" },
 428         { WINBINDD_GETPWENT, winbindd_getpwent, "GETPWENT" },
 429
 430         { WINBINDD_GETGROUPS, winbindd_getgroups, "GETGROUPS" },
 431         { WINBINDD_GETUSERSIDS, winbindd_getusersids, "GETUSERSIDS" },
 432         { WINBINDD_GETUSERDOMGROUPS, winbindd_getuserdomgroups,
 433           "GETUSERDOMGROUPS" },
 434         { WINBINDD_GETSIDALIASES, winbindd_getsidaliases,
 435            "LOOKUPUSERALIASES" },
 436
 437         /* Group functions */
 438
 439         { WINBINDD_GETGRNAM, winbindd_getgrnam, "GETGRNAM" },
 440         { WINBINDD_GETGRGID, winbindd_getgrgid, "GETGRGID" },
 441         { WINBINDD_SETGRENT, winbindd_setgrent, "SETGRENT" },
 442         { WINBINDD_ENDGRENT, winbindd_endgrent, "ENDGRENT" },
 443         { WINBINDD_GETGRENT, winbindd_getgrent, "GETGRENT" },
 444         { WINBINDD_GETGRLST, winbindd_getgrent, "GETGRLST" },
 445
 446         /* PAM auth functions */
 447
 448         { WINBINDD_PAM_AUTH, winbindd_pam_auth, "PAM_AUTH" },
 449         { WINBINDD_PAM_AUTH_CRAP, winbindd_pam_auth_crap, "AUTH_CRAP" },
 450         { WINBINDD_PAM_CHAUTHTOK, winbindd_pam_chauthtok, "CHAUTHTOK" },
 451         { WINBINDD_PAM_LOGOFF, winbindd_pam_logoff, "PAM_LOGOFF" },
 452         { WINBINDD_PAM_CHNG_PSWD_AUTH_CRAP, winbindd_pam_chng_pswd_auth_crap, "CHNG_PSWD_AUTH_CRAP" },
 453
 454         /* Enumeration functions */
 455
 456         { WINBINDD_LIST_USERS, winbindd_list_users, "LIST_USERS" },
 457         { WINBINDD_LIST_GROUPS, winbindd_list_groups, "LIST_GROUPS" },
 458         { WINBINDD_LIST_TRUSTDOM, winbindd_list_trusted_domains,
 459           "LIST_TRUSTDOM" },
 460         { WINBINDD_SHOW_SEQUENCE, winbindd_show_sequence, "SHOW_SEQUENCE" },
 461
 462         /* SID related functions */
 463
 464         { WINBINDD_LOOKUPSID, winbindd_lookupsid, "LOOKUPSID" },
 465         { WINBINDD_LOOKUPNAME, winbindd_lookupname, "LOOKUPNAME" },
 466         { WINBINDD_LOOKUPRIDS, winbindd_lookuprids, "LOOKUPRIDS" },
 467
 468         /* Lookup related functions */
 469
 470         { WINBINDD_SID_TO_UID, winbindd_sid_to_uid, "SID_TO_UID" },
 471         { WINBINDD_SID_TO_GID, winbindd_sid_to_gid, "SID_TO_GID" },
 472         { WINBINDD_UID_TO_SID, winbindd_uid_to_sid, "UID_TO_SID" },
 473         { WINBINDD_GID_TO_SID, winbindd_gid_to_sid, "GID_TO_SID" },
 474         { WINBINDD_ALLOCATE_UID, winbindd_allocate_uid, "ALLOCATE_UID" },
 475         { WINBINDD_ALLOCATE_GID, winbindd_allocate_gid, "ALLOCATE_GID" },
 476         { WINBINDD_SET_MAPPING, winbindd_set_mapping, "SET_MAPPING" },
 477         { WINBINDD_REMOVE_MAPPING, winbindd_remove_mapping, "REMOVE_MAPPING" },
 478         { WINBINDD_SET_HWM, winbindd_set_hwm, "SET_HWMS" },
 479
 480         /* Miscellaneous */
 481
 482         { WINBINDD_CHECK_MACHACC, winbindd_check_machine_acct, "CHECK_MACHACC" },
 483         { WINBINDD_PING, winbindd_ping, "PING" },
 484         { WINBINDD_INFO, winbindd_info, "INFO" },
 485         { WINBINDD_INTERFACE_VERSION, winbindd_interface_version,
 486           "INTERFACE_VERSION" },
 487         { WINBINDD_DOMAIN_NAME, winbindd_domain_name, "DOMAIN_NAME" },
 488         { WINBINDD_DOMAIN_INFO, winbindd_domain_info, "DOMAIN_INFO" },
 489         { WINBINDD_NETBIOS_NAME, winbindd_netbios_name, "NETBIOS_NAME" },
 490         { WINBINDD_PRIV_PIPE_DIR, winbindd_priv_pipe_dir,
 491           "WINBINDD_PRIV_PIPE_DIR" },
 492         { WINBINDD_GETDCNAME, winbindd_getdcname, "GETDCNAME" },
 493         { WINBINDD_DSGETDCNAME, winbindd_dsgetdcname, "DSGETDCNAME" },
 494
 495         /* Credential cache access */
 496         { WINBINDD_CCACHE_NTLMAUTH, winbindd_ccache_ntlm_auth, "NTLMAUTH" },
 497
 498         /* WINS functions */
 499
 500         { WINBINDD_WINS_BYNAME, winbindd_wins_byname, "WINS_BYNAME" },
 501         { WINBINDD_WINS_BYIP, winbindd_wins_byip, "WINS_BYIP" },
 502
 503         /* End of list */
 504
 505         { WINBINDD_NUM_CMDS, NULL, "NONE" }
 506 };
 507
 508 static void process_request(struct winbindd_cli_state *state)
 509 {
 510         struct winbindd_dispatch_table *table = dispatch_table;
 511
 512         ZERO_STRUCT(state->response);
 513
 514         state->response.result = WINBINDD_PENDING;
 515         state->response.length = sizeof(struct winbindd_response);
 516
 517         state->mem_ctx = talloc_init("winbind request");
 518         if (state->mem_ctx == NULL)
 519                 return;
 520
 521         /* Remember who asked us. */
 522         state->pid = state->request->pid;
 523
 524         /* Process command */
 525
 526         for (table = dispatch_table; table->fn; table++) {
 527                 if (state->request->cmd == table->cmd) {
 528                         DEBUG(10,("process_request: request fn %s\n",
 529                                   table->winbindd_cmd_name ));
 530                         table->fn(state);
 531                         break;
 532                 }
 533         }
 534
 535         if (!table->fn) {
 536                 DEBUG(10,("process_request: unknown request fn number %d\n",
 537                           (int)state->request->cmd ));
 538                 request_error(state);
 539         }
 540 }
 541
 542 /*
 543  * A list of file descriptors being monitored by select in the main processing
 544  * loop. winbindd_fd_event->handler is called whenever the socket is readable/writable.
 545  */
 546
 547 static struct winbindd_fd_event *fd_events = NULL;
 548
 549 void add_fd_event(struct winbindd_fd_event *ev)
 550 {
 551         struct winbindd_fd_event *match;
 552
 553         /* only add unique winbindd_fd_event structs */
 554
 555         for (match=fd_events; match; match=match->next ) {
 556 #ifdef DEVELOPER
 557                 SMB_ASSERT( match != ev );
 558 #else
 559                 if ( match == ev )
 560                         return;
 561 #endif
 562         }
 563
 564         DLIST_ADD(fd_events, ev);
 565 }
 566
 567 void remove_fd_event(struct winbindd_fd_event *ev)
 568 {
 569         DLIST_REMOVE(fd_events, ev);
 570 }
 571
 572 /*
 573  * Handler for winbindd_fd_events to complete a read/write request, set up by
 574  * setup_async_read/setup_async_write.
 575  */
 576
 577 static void rw_callback(struct winbindd_fd_event *event, int flags)
 578 {
 579         size_t todo;
 580         ssize_t done = 0;
 581
 582         todo = event->length - event->done;
 583
 584         if (event->flags & EVENT_FD_WRITE) {
 585                 SMB_ASSERT(flags == EVENT_FD_WRITE);
 586                 done = sys_write(event->fd,
 587                                  &((char *)event->data)[event->done],
 588                                  todo);
 589
 590                 if (done <= 0) {
 591                         event->flags = 0;
 592                         event->finished(event->private_data, False);
 593                         return;
 594                 }
 595         }
 596
 597         if (event->flags & EVENT_FD_READ) {
 598                 SMB_ASSERT(flags == EVENT_FD_READ);
 599                 done = sys_read(event->fd, &((char *)event->data)[event->done],
 600                                 todo);
 601
 602                 if (done <= 0) {
 603                         event->flags = 0;
 604                         event->finished(event->private_data, False);
 605                         return;
 606                 }
 607         }
 608
 609         event->done += done;
 610
 611         if (event->done == event->length) {
 612                 event->flags = 0;
 613                 event->finished(event->private_data, True);
 614         }
 615 }
 616
 617 /*
 618  * Request an async read/write on a winbindd_fd_event structure. (*finished) is called
 619  * when the request is completed or an error had occurred.
 620  */
 621
 622 void setup_async_read(struct winbindd_fd_event *event, void *data, size_t length,
 623                       void (*finished)(void *private_data, bool success),
 624                       void *private_data)
 625 {
 626         SMB_ASSERT(event->flags == 0);
 627         event->data = data;
 628         event->length = length;
 629         event->done = 0;
 630         event->handler = rw_callback;
 631         event->finished = finished;
 632         event->private_data = private_data;
 633         event->flags = EVENT_FD_READ;
 634 }
 635
 636 void setup_async_write(struct winbindd_fd_event *event, void *data, size_t length,
 637                        void (*finished)(void *private_data, bool success),
 638                        void *private_data)
 639 {
 640         SMB_ASSERT(event->flags == 0);
 641         event->data = data;
 642         event->length = length;
 643         event->done = 0;
 644         event->handler = rw_callback;
 645         event->finished = finished;
 646         event->private_data = private_data;
 647         event->flags = EVENT_FD_WRITE;
 648 }
 649
 650 /*
 651  * This is the main event loop of winbind requests. It goes through a
 652  * state-machine of 3 read/write requests, 4 if you have extra data to send.
 653  *
 654  * An idle winbind client has a read request of 4 bytes outstanding,
 655  * finalizing function is request_len_recv, checking the length. request_recv
 656  * then processes the packet. The processing function then at some point has
 657  * to call request_finished which schedules sending the response.
 658  */
 659
 660 static void request_finished(struct winbindd_cli_state *state);
 661
 662 static void winbind_client_request_read(struct tevent_req *req);
 663 static void winbind_client_response_written(struct tevent_req *req);
 664
 665 static void request_finished(struct winbindd_cli_state *state)
 666 {
 667         struct tevent_req *req;
 668
 669         TALLOC_FREE(state->request);
 670
 671         req = wb_resp_write_send(state, winbind_event_context(),
 672                                  state->out_queue, state->sock,
 673                                  &state->response);
 674         if (req == NULL) {
 675                 state->finished = true;
 676                 return;
 677         }
 678         tevent_req_set_callback(req, winbind_client_response_written, state);
 679 }
 680
 681 static void winbind_client_response_written(struct tevent_req *req)
 682 {
 683         struct winbindd_cli_state *state = tevent_req_callback_data(
 684                 req, struct winbindd_cli_state);
 685         ssize_t ret;
 686         int err;
 687
 688         ret = wb_resp_write_recv(req, &err);
 689         TALLOC_FREE(req);
 690         if (ret == -1) {
 691                 DEBUG(2, ("Could not write response to client: %s\n",
 692                           strerror(err)));
 693                 state->finished = true;
 694                 return;
 695         }
 696
 697         TALLOC_FREE(state->mem_ctx);
 698
 699         req = wb_req_read_send(state, winbind_event_context(), state->sock,
 700                                WINBINDD_MAX_EXTRA_DATA);
 701         if (req == NULL) {
 702                 state->finished = true;
 703                 return;
 704         }
 705         tevent_req_set_callback(req, winbind_client_request_read, state);
 706 }
 707
 708 void request_error(struct winbindd_cli_state *state)
 709 {
 710         SMB_ASSERT(state->response.result == WINBINDD_PENDING);
 711         state->response.result = WINBINDD_ERROR;
 712         request_finished(state);
 713 }
 714
 715 void request_ok(struct winbindd_cli_state *state)
 716 {
 717         SMB_ASSERT(state->response.result == WINBINDD_PENDING);
 718         state->response.result = WINBINDD_OK;
 719         request_finished(state);
 720 }
 721
 722 /* Process a new connection by adding it to the client connection list */
 723
 724 static void new_connection(int listen_sock, bool privileged)
 725 {
 726         struct sockaddr_un sunaddr;
 727         struct winbindd_cli_state *state;
 728         struct tevent_req *req;
 729         socklen_t len;
 730         int sock;
 731
 732         /* Accept connection */
 733
 734         len = sizeof(sunaddr);
 735
 736         do {
 737                 sock = accept(listen_sock, (struct sockaddr *)(void *)&sunaddr,
 738                               &len);
 739         } while (sock == -1 && errno == EINTR);
 740
 741         if (sock == -1)
 742                 return;
 743
 744         DEBUG(6,("accepted socket %d\n", sock));
 745
 746         /* Create new connection structure */
 747
 748         if ((state = TALLOC_ZERO_P(NULL, struct winbindd_cli_state)) == NULL) {
 749                 close(sock);
 750                 return;
 751         }
 752
 753         state->sock = sock;
 754
 755         state->out_queue = tevent_queue_create(state, "winbind client reply");
 756         if (state->out_queue == NULL) {
 757                 close(sock);
 758                 TALLOC_FREE(state);
 759                 return;
 760         }
 761
 762         state->last_access = time(NULL);
 763
 764         state->privileged = privileged;
 765
 766         req = wb_req_read_send(state, winbind_event_context(), state->sock,
 767                                WINBINDD_MAX_EXTRA_DATA);
 768         if (req == NULL) {
 769                 TALLOC_FREE(state);
 770                 close(sock);
 771                 return;
 772         }
 773         tevent_req_set_callback(req, winbind_client_request_read, state);
 774
 775         /* Add to connection list */
 776
 777         winbindd_add_client(state);
 778 }
 779
 780 static void winbind_client_request_read(struct tevent_req *req)
 781 {
 782         struct winbindd_cli_state *state = tevent_req_callback_data(
 783                 req, struct winbindd_cli_state);
 784         ssize_t ret;
 785         int err;
 786
 787         ret = wb_req_read_recv(req, state, &state->request, &err);
 788         if (ret == -1) {
 789                 DEBUG(2, ("Could not read client request: %s\n",
 790                           strerror(err)));
 791                 state->finished = true;
 792                 return;
 793         }
 794         process_request(state);
 795 }
 796
 797 /* Remove a client connection from client connection list */
 798
 799 static void remove_client(struct winbindd_cli_state *state)
 800 {
 801         char c = 0;
 802         int nwritten;
 803
 804         /* It's a dead client - hold a funeral */
 805
 806         if (state == NULL) {
 807                 return;
 808         }
 809
 810         /* tell client, we are closing ... */
 811         nwritten = write(state->sock, &c, sizeof(c));
 812         if (nwritten == -1) {
 813                 /*
 814                  * ignore EPIPE error here, because the other end might
 815                  * have already closed the socket.
 816                  */
 817                 if (errno != EPIPE) {
 818                         DEBUG(2, ("final write to client failed: %s\n",
 819                                 strerror(errno)));
 820                 }
 821         }
 822
 823         /* Close socket */
 824
 825         close(state->sock);
 826
 827         /* Free any getent state */
 828
 829         free_getent_state(state->getpwent_state);
 830         free_getent_state(state->getgrent_state);
 831
 832         TALLOC_FREE(state->mem_ctx);
 833
 834         /* Remove from list and free */
 835
 836         winbindd_remove_client(state);
 837         TALLOC_FREE(state);
 838 }
 839
 840 /* Shutdown client connection which has been idle for the longest time */
 841
 842 static bool remove_idle_client(void)
 843 {
 844         struct winbindd_cli_state *state, *remove_state = NULL;
 845         time_t last_access = 0;
 846         int nidle = 0;
 847
 848         for (state = winbindd_client_list(); state; state = state->next) {
 849                 if (state->response.result != WINBINDD_PENDING &&
 850                     !state->getpwent_state && !state->getgrent_state) {
 851                         nidle++;
 852                         if (!last_access || state->last_access < last_access) {
 853                                 last_access = state->last_access;
 854                                 remove_state = state;
 855                         }
 856                 }
 857         }
 858
 859         if (remove_state) {
 860                 DEBUG(5,("Found %d idle client connections, shutting down sock %d, pid %u\n",
 861                         nidle, remove_state->sock, (unsigned int)remove_state->pid));
 862                 remove_client(remove_state);
 863                 return True;
 864         }
 865
 866         return False;
 867 }
 868
 869 struct winbindd_listen_state {
 870         bool privileged;
 871         int fd;
 872         struct tevent_fd *fde;
 873 };
 874
 875 static void winbindd_listen_fde_handler(struct tevent_context *ev,
 876                                         struct tevent_fd *fde,
 877                                         uint16_t flags,
 878                                         void *private_data)
 879 {
 880         struct winbindd_listen_state *s = talloc_get_type_abort(private_data,
 881                                           struct winbindd_listen_state);
 882
 883         while (winbindd_num_clients() >
 884                WINBINDD_MAX_SIMULTANEOUS_CLIENTS - 1) {
 885                 DEBUG(5,("winbindd: Exceeding %d client "
 886                          "connections, removing idle "
 887                          "connection.\n",
 888                          WINBINDD_MAX_SIMULTANEOUS_CLIENTS));
 889                 if (!remove_idle_client()) {
 890                         DEBUG(0,("winbindd: Exceeding %d "
 891                                  "client connections, no idle "
 892                                  "connection found\n",
 893                                  WINBINDD_MAX_SIMULTANEOUS_CLIENTS));
 894                         break;
 895                 }
 896         }
 897         new_connection(s->fd, s->privileged);
 898 }
 899
 900 static bool winbindd_setup_listeners(void)
 901 {
 902         struct winbindd_listen_state *pub_state = NULL;
 903         struct winbindd_listen_state *priv_state = NULL;
 904
 905         pub_state = talloc(winbind_event_context(),
 906                            struct winbindd_listen_state);
 907         if (!pub_state) {
 908                 goto failed;
 909         }
 910
 911         pub_state->privileged = false;
 912         pub_state->fd = open_winbindd_socket();
 913         if (pub_state->fd == -1) {
 914                 goto failed;
 915         }
 916
 917         pub_state->fde = tevent_add_fd(winbind_event_context(),
 918                                        pub_state, pub_state->fd,
 919                                        TEVENT_FD_READ,
 920                                        winbindd_listen_fde_handler,
 921                                        pub_state);
 922         if (!pub_state->fde) {
 923                 close(pub_state->fd);
 924                 goto failed;
 925         }
 926         tevent_fd_set_auto_close(pub_state->fde);
 927
 928         priv_state = talloc(winbind_event_context(),
 929                             struct winbindd_listen_state);
 930         if (!priv_state) {
 931                 goto failed;
 932         }
 933
 934         priv_state->privileged = true;
 935         priv_state->fd = open_winbindd_priv_socket();
 936         if (priv_state->fd == -1) {
 937                 goto failed;
 938         }
 939
 940         priv_state->fde = tevent_add_fd(winbind_event_context(),
 941                                         priv_state, priv_state->fd,
 942                                         TEVENT_FD_READ,
 943                                         winbindd_listen_fde_handler,
 944                                         priv_state);
 945         if (!priv_state->fde) {
 946                 close(priv_state->fd);
 947                 goto failed;
 948         }
 949         tevent_fd_set_auto_close(priv_state->fde);
 950
 951         return true;
 952 failed:
 953         TALLOC_FREE(pub_state);
 954         TALLOC_FREE(priv_state);
 955         return false;
 956 }
 957
 958 /* Process incoming clients on listen_sock.  We use a tricky non-blocking,
 959    non-forking, non-threaded model which allows us to handle many
 960    simultaneous connections while remaining impervious to many denial of
 961    service attacks. */
 962
 963 static void process_loop(void)
 964 {
 965         struct winbindd_fd_event *ev;
 966         fd_set r_fds, w_fds;
 967         int maxfd = 0, selret;
 968         struct timeval timeout, ev_timeout;
 969
 970         run_events(winbind_event_context(), 0, NULL, NULL);
 971
 972         /* Initialise fd lists for select() */
 973
 974         FD_ZERO(&r_fds);
 975         FD_ZERO(&w_fds);
 976
 977         timeout.tv_sec = WINBINDD_ESTABLISH_LOOP;
 978         timeout.tv_usec = 0;
 979
 980         /* Check for any event timeouts. */
 981         {
 982                 struct timeval now;
 983                 GetTimeOfDay(&now);
 984
 985                 event_add_to_select_args(winbind_event_context(), &now,
 986                                          &r_fds, &w_fds, &ev_timeout, &maxfd);
 987         }
 988         if (get_timed_events_timeout(winbind_event_context(), &ev_timeout)) {
 989                 timeout = timeval_min(&timeout, &ev_timeout);
 990         }
 991
 992         for (ev = fd_events; ev; ev = ev->next) {
 993                 if (ev->flags & EVENT_FD_READ) {
 994                         FD_SET(ev->fd, &r_fds);
 995                         maxfd = MAX(ev->fd, maxfd);
 996                 }
 997                 if (ev->flags & EVENT_FD_WRITE) {
 998                         FD_SET(ev->fd, &w_fds);
 999                         maxfd = MAX(ev->fd, maxfd);
1000                 }
1001         }
1002
1003         /* Call select */
1004
1005         selret = sys_select(maxfd + 1, &r_fds, &w_fds, NULL, &timeout);
1006
1007         if (selret == 0) {
1008                 goto no_fds_ready;
1009         }
1010
1011         if (selret == -1) {
1012                 if (errno == EINTR) {
1013                         goto no_fds_ready;
1014                 }
1015
1016                 /* Select error, something is badly wrong */
1017
1018                 perror("select");
1019                 exit(1);
1020         }
1021
1022         /* selret > 0 */
1023
1024         run_events(winbind_event_context(), selret, &r_fds, &w_fds);
1025
1026         ev = fd_events;
1027         while (ev != NULL) {
1028                 struct winbindd_fd_event *next = ev->next;
1029                 int flags = 0;
1030                 if (FD_ISSET(ev->fd, &r_fds))
1031                         flags |= EVENT_FD_READ;
1032                 if (FD_ISSET(ev->fd, &w_fds))
1033                         flags |= EVENT_FD_WRITE;
1034                 if (flags)
1035                         ev->handler(ev, flags);
1036                 ev = next;
1037         }
1038
1039         return;
1040
1041  no_fds_ready:
1042
1043         run_events(winbind_event_context(), selret, &r_fds, &w_fds);
1044
1045 #if 0
1046         winbindd_check_cache_size(time(NULL));
1047 #endif
1048 }
1049
1050 bool winbindd_use_idmap_cache(void)
1051 {
1052         return !opt_nocache;
1053 }
1054
1055 bool winbindd_use_cache(void)
1056 {
1057         return !opt_nocache;
1058 }
1059
1060 /* Main function */
1061
1062 int main(int argc, char **argv, char **envp)
1063 {
1064         static bool is_daemon = False;
1065         static bool Fork = True;
1066         static bool log_stdout = False;
1067         static bool no_process_group = False;
1068         enum {
1069                 OPT_DAEMON = 1000,
1070                 OPT_FORK,
1071                 OPT_NO_PROCESS_GROUP,
1072                 OPT_LOG_STDOUT
1073         };
1074         struct poptOption long_options[] = {
1075                 POPT_AUTOHELP
1076                 { "stdout", 'S', POPT_ARG_NONE, NULL, OPT_LOG_STDOUT, "Log to stdout" },
1077                 { "foreground", 'F', POPT_ARG_NONE, NULL, OPT_FORK, "Daemon in foreground mode" },
1078                 { "no-process-group", 0, POPT_ARG_NONE, NULL, OPT_NO_PROCESS_GROUP, "Don't create a new process group" },
1079                 { "daemon", 'D', POPT_ARG_NONE, NULL, OPT_DAEMON, "Become a daemon (default)" },
1080                 { "interactive", 'i', POPT_ARG_NONE, NULL, 'i', "Interactive mode" },
1081                 { "no-caching", 'n', POPT_ARG_NONE, NULL, 'n', "Disable caching" },
1082                 POPT_COMMON_SAMBA
1083                 POPT_TABLEEND
1084         };
1085         poptContext pc;
1086         int opt;
1087         TALLOC_CTX *frame = talloc_stackframe();
1088
1089         /* glibc (?) likes to print "User defined signal 1" and exit if a
1090            SIGUSR[12] is received before a handler is installed */
1091
1092         CatchSignal(SIGUSR1, SIG_IGN);
1093         CatchSignal(SIGUSR2, SIG_IGN);
1094
1095         fault_setup((void (*)(void *))fault_quit );
1096         dump_core_setup("winbindd");
1097
1098         load_case_tables();
1099
1100         /* Initialise for running in non-root mode */
1101
1102         sec_init();
1103
1104         set_remote_machine_name("winbindd", False);
1105
1106         /* Set environment variable so we don't recursively call ourselves.
1107            This may also be useful interactively. */
1108
1109         if ( !winbind_off() ) {
1110                 DEBUG(0,("Failed to disable recusive winbindd calls.  Exiting.\n"));
1111                 exit(1);
1112         }
1113
1114         /* Initialise samba/rpc client stuff */
1115
1116         pc = poptGetContext("winbindd", argc, (const char **)argv, long_options, 0);
1117
1118         while ((opt = poptGetNextOpt(pc)) != -1) {
1119                 switch (opt) {
1120                         /* Don't become a daemon */
1121                 case OPT_DAEMON:
1122                         is_daemon = True;
1123                         break;
1124                 case 'i':
1125                         interactive = True;
1126                         log_stdout = True;
1127                         Fork = False;
1128                         break;
1129                 case OPT_FORK:
1130                         Fork = false;
1131                         break;
1132                 case OPT_NO_PROCESS_GROUP:
1133                         no_process_group = true;
1134                         break;
1135                 case OPT_LOG_STDOUT:
1136                         log_stdout = true;
1137                         break;
1138                 case 'n':
1139                         opt_nocache = true;
1140                         break;
1141                 default:
1142                         d_fprintf(stderr, "\nInvalid option %s: %s\n\n",
1143                                   poptBadOption(pc, 0), poptStrerror(opt));
1144                         poptPrintUsage(pc, stderr, 0);
1145                         exit(1);
1146                 }
1147         }
1148
1149         if (is_daemon && interactive) {
1150                 d_fprintf(stderr,"\nERROR: "
1151                           "Option -i|--interactive is not allowed together with -D|--daemon\n\n");
1152                 poptPrintUsage(pc, stderr, 0);
1153                 exit(1);
1154         }
1155
1156         if (log_stdout && Fork) {
1157                 d_fprintf(stderr, "\nERROR: "
1158                           "Can't log to stdout (-S) unless daemon is in foreground +(-F) or interactive (-i)\n\n");
1159                 poptPrintUsage(pc, stderr, 0);
1160                 exit(1);
1161         }
1162
1163         poptFreeContext(pc);
1164
1165         if (!override_logfile) {
1166                 char *lfile = NULL;
1167                 if (asprintf(&lfile,"%s/log.winbindd",
1168                                 get_dyn_LOGFILEBASE()) > 0) {
1169                         lp_set_logfile(lfile);
1170                         SAFE_FREE(lfile);
1171                 }
1172         }
1173         setup_logging("winbindd", log_stdout);
1174         reopen_logs();
1175
1176         DEBUG(0,("winbindd version %s started.\n", samba_version_string()));
1177         DEBUGADD(0,("%s\n", COPYRIGHT_STARTUP_MESSAGE));
1178
1179         if (!lp_load_initial_only(get_dyn_CONFIGFILE())) {
1180                 DEBUG(0, ("error opening config file\n"));
1181                 exit(1);
1182         }
1183
1184         /* Initialise messaging system */
1185
1186         if (winbind_messaging_context() == NULL) {
1187                 exit(1);
1188         }
1189
1190         if (!reload_services_file(NULL)) {
1191                 DEBUG(0, ("error opening config file\n"));
1192                 exit(1);
1193         }
1194
1195         if (!directory_exist(lp_lockdir())) {
1196                 mkdir(lp_lockdir(), 0755);
1197         }
1198
1199         /* Setup names. */
1200
1201         if (!init_names())
1202                 exit(1);
1203
1204         load_interfaces();
1205
1206         if (!secrets_init()) {
1207
1208                 DEBUG(0,("Could not initialize domain trust account secrets. Giving up\n"));
1209                 return False;
1210         }
1211
1212         /* Enable netbios namecache */
1213
1214         namecache_enable();
1215
1216         /* Unblock all signals we are interested in as they may have been
1217            blocked by the parent process. */
1218
1219         BlockSignals(False, SIGINT);
1220         BlockSignals(False, SIGQUIT);
1221         BlockSignals(False, SIGTERM);
1222         BlockSignals(False, SIGUSR1);
1223         BlockSignals(False, SIGUSR2);
1224         BlockSignals(False, SIGHUP);
1225         BlockSignals(False, SIGCHLD);
1226
1227         if (!interactive)
1228                 become_daemon(Fork, no_process_group);
1229
1230         pidfile_create("winbindd");
1231
1232 #if HAVE_SETPGID
1233         /*
1234          * If we're interactive we want to set our own process group for
1235          * signal management.
1236          */
1237         if (interactive && !no_process_group)
1238                 setpgid( (pid_t)0, (pid_t)0);
1239 #endif
1240
1241         TimeInit();
1242
1243         /* Don't use winbindd_reinit_after_fork here as
1244          * we're just starting up and haven't created any
1245          * winbindd-specific resources we must free yet. JRA.
1246          */
1247
1248         if (!NT_STATUS_IS_OK(reinit_after_fork(winbind_messaging_context(),
1249                                                winbind_event_context(),
1250                                                false))) {
1251                 DEBUG(0,("reinit_after_fork() failed\n"));
1252                 exit(1);
1253         }
1254
1255         /* Setup signal handlers */
1256
1257         if (!winbindd_setup_sig_term_handler(true))
1258                 exit(1);
1259         if (!winbindd_setup_sig_hup_handler(NULL))
1260                 exit(1);
1261         if (!winbindd_setup_sig_chld_handler())
1262                 exit(1);
1263         if (!winbindd_setup_sig_usr2_handler())
1264                 exit(1);
1265
1266         CatchSignal(SIGPIPE, SIG_IGN);                 /* Ignore sigpipe */
1267
1268         /*
1269          * Ensure all cache and idmap caches are consistent
1270          * and initialized before we startup.
1271          */
1272         if (!winbindd_cache_validate_and_initialize()) {
1273                 exit(1);
1274         }
1275
1276         /* get broadcast messages */
1277         claim_connection(NULL,"",FLAG_MSG_GENERAL|FLAG_MSG_DBWRAP);
1278
1279         /* React on 'smbcontrol winbindd reload-config' in the same way
1280            as to SIGHUP signal */
1281         messaging_register(winbind_messaging_context(), NULL,
1282                            MSG_SMB_CONF_UPDATED, msg_reload_services);
1283         messaging_register(winbind_messaging_context(), NULL,
1284                            MSG_SHUTDOWN, msg_shutdown);
1285
1286         /* Handle online/offline messages. */
1287         messaging_register(winbind_messaging_context(), NULL,
1288                            MSG_WINBIND_OFFLINE, winbind_msg_offline);
1289         messaging_register(winbind_messaging_context(), NULL,
1290                            MSG_WINBIND_ONLINE, winbind_msg_online);
1291         messaging_register(winbind_messaging_context(), NULL,
1292                            MSG_WINBIND_ONLINESTATUS, winbind_msg_onlinestatus);
1293
1294         messaging_register(winbind_messaging_context(), NULL,
1295                            MSG_DUMP_EVENT_LIST, winbind_msg_dump_event_list);
1296
1297         messaging_register(winbind_messaging_context(), NULL,
1298                            MSG_WINBIND_VALIDATE_CACHE,
1299                            winbind_msg_validate_cache);
1300
1301         messaging_register(winbind_messaging_context(), NULL,
1302                            MSG_WINBIND_DUMP_DOMAIN_LIST,
1303                            winbind_msg_dump_domain_list);
1304
1305         /* Register handler for MSG_DEBUG. */
1306         messaging_register(winbind_messaging_context(), NULL,
1307                            MSG_DEBUG,
1308                            winbind_msg_debug);
1309
1310         netsamlogon_cache_init(); /* Non-critical */
1311
1312         /* clear the cached list of trusted domains */
1313
1314         wcache_tdc_clear();
1315
1316         if (!init_domain_list()) {
1317                 DEBUG(0,("unable to initialize domain list\n"));
1318                 exit(1);
1319         }
1320
1321         init_idmap_child();
1322         init_locator_child();
1323
1324         smb_nscd_flush_user_cache();
1325         smb_nscd_flush_group_cache();
1326
1327         /* setup listen sockets */
1328
1329         if (!winbindd_setup_listeners()) {
1330                 DEBUG(0,("winbindd_setup_listeners() failed\n"));
1331                 exit(1);
1332         }
1333
1334         TALLOC_FREE(frame);
1335         /* Loop waiting for requests */
1336         while (1) {
1337                 struct winbindd_cli_state *state;
1338
1339                 frame = talloc_stackframe();
1340
1341                 /* refresh the trusted domain cache */
1342
1343                 rescan_trusted_domains();
1344
1345                 /* Dispose of client connection if it is marked as
1346                    finished */
1347                 state = winbindd_client_list();
1348                 while (state) {
1349                         struct winbindd_cli_state *next = state->next;
1350
1351                         if (state->finished) {
1352                                 remove_client(state);
1353                         }
1354
1355                         state = next;
1356                 }
1357
1358                 process_loop();
1359
1360                 TALLOC_FREE(frame);
1361         }
1362
1363         return 0;
1364 }