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