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 "popt_common.h"
  27 #include "winbindd.h"
  28 #include "nsswitch/winbind_client.h"
  29 #include "nsswitch/wb_reqtrans.h"
  30 #include "ntdomain.h"
  31 #include "../librpc/gen_ndr/srv_lsa.h"
  32 #include "../librpc/gen_ndr/srv_samr.h"
  33 #include "secrets.h"
  34 #include "idmap.h"
  35 #include "lib/addrchange.h"
  36 #include "serverid.h"
  37 #include "auth.h"
  38 #include "messages.h"
  39 #include "../lib/util/pidfile.h"
  40
  41 #undef DBGC_CLASS
  42 #define DBGC_CLASS DBGC_WINBIND
  43
  44 static bool client_is_idle(struct winbindd_cli_state *state);
  45 static void remove_client(struct winbindd_cli_state *state);
  46
  47 static bool opt_nocache = False;
  48 static bool interactive = False;
  49
  50 extern bool override_logfile;
  51
  52 struct tevent_context *winbind_event_context(void)
  53 {
  54         static struct tevent_context *ev = NULL;
  55
  56         if (ev != NULL) {
  57                 return ev;
  58         }
  59
  60         /*
  61          * Note we MUST use the NULL context here, not the autofree context,
  62          * to avoid side effects in forked children exiting.
  63          */
  64         ev = samba_tevent_context_init(NULL);
  65         if (ev == NULL) {
  66                 smb_panic("Could not init winbindd's messaging context.\n");
  67         }
  68         return ev;
  69 }
  70
  71 struct messaging_context *winbind_messaging_context(void)
  72 {
  73         static struct messaging_context *msg = NULL;
  74
  75         if (msg != NULL) {
  76                 return msg;
  77         }
  78
  79         /*
  80          * Note we MUST use the NULL context here, not the autofree context,
  81          * to avoid side effects in forked children exiting.
  82          */
  83         msg = messaging_init(NULL, winbind_event_context());
  84         if (msg == NULL) {
  85                 smb_panic("Could not init winbindd's messaging context.\n");
  86         }
  87         return msg;
  88 }
  89
  90 /* Reload configuration */
  91
  92 static bool reload_services_file(const char *lfile)
  93 {
  94         bool ret;
  95
  96         if (lp_loaded()) {
  97                 char *fname = lp_configfile(talloc_tos());
  98
  99                 if (file_exist(fname) && !strcsequal(fname,get_dyn_CONFIGFILE())) {
 100                         set_dyn_CONFIGFILE(fname);
 101                 }
 102                 TALLOC_FREE(fname);
 103         }
 104
 105         /* if this is a child, restore the logfile to the special
 106            name - <domain>, idmap, etc. */
 107         if (lfile && *lfile) {
 108                 lp_set_logfile(lfile);
 109         }
 110
 111         reopen_logs();
 112         ret = lp_load_global(get_dyn_CONFIGFILE());
 113
 114         reopen_logs();
 115         load_interfaces();
 116
 117         return(ret);
 118 }
 119
 120
 121 static void winbindd_status(void)
 122 {
 123         struct winbindd_cli_state *tmp;
 124
 125         DEBUG(0, ("winbindd status:\n"));
 126
 127         /* Print client state information */
 128
 129         DEBUG(0, ("\t%d clients currently active\n", winbindd_num_clients()));
 130
 131         if (DEBUGLEVEL >= 2 && winbindd_num_clients()) {
 132                 DEBUG(2, ("\tclient list:\n"));
 133                 for(tmp = winbindd_client_list(); tmp; tmp = tmp->next) {
 134                         DEBUGADD(2, ("\t\tpid %lu, sock %d (%s)\n",
 135                                      (unsigned long)tmp->pid, tmp->sock,
 136                                      client_is_idle(tmp) ? "idle" : "active"));
 137                 }
 138         }
 139 }
 140
 141 /* Flush client cache */
 142
 143 static void flush_caches(void)
 144 {
 145         /* We need to invalidate cached user list entries on a SIGHUP
 146            otherwise cached access denied errors due to restrict anonymous
 147            hang around until the sequence number changes. */
 148
 149         if (!wcache_invalidate_cache()) {
 150                 DEBUG(0, ("invalidating the cache failed; revalidate the cache\n"));
 151                 if (!winbindd_cache_validate_and_initialize()) {
 152                         exit(1);
 153                 }
 154         }
 155 }
 156
 157 static void flush_caches_noinit(void)
 158 {
 159         /*
 160          * We need to invalidate cached user list entries on a SIGHUP
 161          * otherwise cached access denied errors due to restrict anonymous
 162          * hang around until the sequence number changes.
 163          * NB
 164          * Skip uninitialized domains when flush cache.
 165          * If domain is not initialized, it means it is never
 166          * used or never become online. look, wcache_invalidate_cache()
 167          * -> get_cache() -> init_dc_connection(). It causes a lot of traffic
 168          * for unused domains and large traffic for primay domain's DC if there
 169          * are many domains..
 170          */
 171
 172         if (!wcache_invalidate_cache_noinit()) {
 173                 DEBUG(0, ("invalidating the cache failed; revalidate the cache\n"));
 174                 if (!winbindd_cache_validate_and_initialize()) {
 175                         exit(1);
 176                 }
 177         }
 178 }
 179
 180 /* Handle the signal by unlinking socket and exiting */
 181
 182 static void terminate(bool is_parent)
 183 {
 184         if (is_parent) {
 185                 /* When parent goes away we should
 186                  * remove the socket file. Not so
 187                  * when children terminate.
 188                  */
 189                 char *path = NULL;
 190
 191                 if (asprintf(&path, "%s/%s",
 192                         get_winbind_pipe_dir(), WINBINDD_SOCKET_NAME) > 0) {
 193                         unlink(path);
 194                         SAFE_FREE(path);
 195                 }
 196         }
 197
 198         idmap_close();
 199
 200         trustdom_cache_shutdown();
 201
 202         gencache_stabilize();
 203
 204 #if 0
 205         if (interactive) {
 206                 TALLOC_CTX *mem_ctx = talloc_init("end_description");
 207                 char *description = talloc_describe_all(mem_ctx);
 208
 209                 DEBUG(3, ("tallocs left:\n%s\n", description));
 210                 talloc_destroy(mem_ctx);
 211         }
 212 #endif
 213
 214         if (is_parent) {
 215                 struct messaging_context *msg = winbind_messaging_context();
 216                 struct server_id self = messaging_server_id(msg);
 217                 serverid_deregister(self);
 218                 pidfile_unlink(lp_piddir(), "winbindd");
 219         }
 220
 221         exit(0);
 222 }
 223
 224 static void winbindd_sig_term_handler(struct tevent_context *ev,
 225                                       struct tevent_signal *se,
 226                                       int signum,
 227                                       int count,
 228                                       void *siginfo,
 229                                       void *private_data)
 230 {
 231         bool *is_parent = talloc_get_type_abort(private_data, bool);
 232
 233         DEBUG(0,("Got sig[%d] terminate (is_parent=%d)\n",
 234                  signum, (int)*is_parent));
 235         terminate(*is_parent);
 236 }
 237
 238 /*
 239   handle stdin becoming readable when we are in --foreground mode
 240  */
 241 static void winbindd_stdin_handler(struct tevent_context *ev,
 242                                struct tevent_fd *fde,
 243                                uint16_t flags,
 244                                void *private_data)
 245 {
 246         char c;
 247         if (read(0, &c, 1) != 1) {
 248                 bool *is_parent = talloc_get_type_abort(private_data, bool);
 249
 250                 /* we have reached EOF on stdin, which means the
 251                    parent has exited. Shutdown the server */
 252                 DEBUG(0,("EOF on stdin (is_parent=%d)\n",
 253                          (int)*is_parent));
 254                 terminate(*is_parent);
 255         }
 256 }
 257
 258 bool winbindd_setup_sig_term_handler(bool parent)
 259 {
 260         struct tevent_signal *se;
 261         bool *is_parent;
 262
 263         is_parent = talloc(winbind_event_context(), bool);
 264         if (!is_parent) {
 265                 return false;
 266         }
 267
 268         *is_parent = parent;
 269
 270         se = tevent_add_signal(winbind_event_context(),
 271                                is_parent,
 272                                SIGTERM, 0,
 273                                winbindd_sig_term_handler,
 274                                is_parent);
 275         if (!se) {
 276                 DEBUG(0,("failed to setup SIGTERM handler"));
 277                 talloc_free(is_parent);
 278                 return false;
 279         }
 280
 281         se = tevent_add_signal(winbind_event_context(),
 282                                is_parent,
 283                                SIGINT, 0,
 284                                winbindd_sig_term_handler,
 285                                is_parent);
 286         if (!se) {
 287                 DEBUG(0,("failed to setup SIGINT handler"));
 288                 talloc_free(is_parent);
 289                 return false;
 290         }
 291
 292         se = tevent_add_signal(winbind_event_context(),
 293                                is_parent,
 294                                SIGQUIT, 0,
 295                                winbindd_sig_term_handler,
 296                                is_parent);
 297         if (!se) {
 298                 DEBUG(0,("failed to setup SIGINT handler"));
 299                 talloc_free(is_parent);
 300                 return false;
 301         }
 302
 303         return true;
 304 }
 305
 306 bool winbindd_setup_stdin_handler(bool parent, bool foreground)
 307 {
 308         bool *is_parent;
 309
 310         if (foreground) {
 311                 is_parent = talloc(winbind_event_context(), bool);
 312                 if (!is_parent) {
 313                         return false;
 314                 }
 315
 316                 *is_parent = parent;
 317
 318                 /* if we are running in the foreground then look for
 319                    EOF on stdin, and exit if it happens. This allows
 320                    us to die if the parent process dies
 321                 */
 322                 tevent_add_fd(winbind_event_context(), is_parent, 0, TEVENT_FD_READ, winbindd_stdin_handler, is_parent);
 323         }
 324
 325         return true;
 326 }
 327
 328 static void winbindd_sig_hup_handler(struct tevent_context *ev,
 329                                      struct tevent_signal *se,
 330                                      int signum,
 331                                      int count,
 332                                      void *siginfo,
 333                                      void *private_data)
 334 {
 335         const char *file = (const char *)private_data;
 336
 337         DEBUG(1,("Reloading services after SIGHUP\n"));
 338         flush_caches_noinit();
 339         reload_services_file(file);
 340 }
 341
 342 bool winbindd_setup_sig_hup_handler(const char *lfile)
 343 {
 344         struct tevent_signal *se;
 345         char *file = NULL;
 346
 347         if (lfile) {
 348                 file = talloc_strdup(winbind_event_context(),
 349                                      lfile);
 350                 if (!file) {
 351                         return false;
 352                 }
 353         }
 354
 355         se = tevent_add_signal(winbind_event_context(),
 356                                winbind_event_context(),
 357                                SIGHUP, 0,
 358                                winbindd_sig_hup_handler,
 359                                file);
 360         if (!se) {
 361                 return false;
 362         }
 363
 364         return true;
 365 }
 366
 367 static void winbindd_sig_chld_handler(struct tevent_context *ev,
 368                                       struct tevent_signal *se,
 369                                       int signum,
 370                                       int count,
 371                                       void *siginfo,
 372                                       void *private_data)
 373 {
 374         pid_t pid;
 375
 376         while ((pid = sys_waitpid(-1, NULL, WNOHANG)) > 0) {
 377                 winbind_child_died(pid);
 378         }
 379 }
 380
 381 static bool winbindd_setup_sig_chld_handler(void)
 382 {
 383         struct tevent_signal *se;
 384
 385         se = tevent_add_signal(winbind_event_context(),
 386                                winbind_event_context(),
 387                                SIGCHLD, 0,
 388                                winbindd_sig_chld_handler,
 389                                NULL);
 390         if (!se) {
 391                 return false;
 392         }
 393
 394         return true;
 395 }
 396
 397 static void winbindd_sig_usr2_handler(struct tevent_context *ev,
 398                                       struct tevent_signal *se,
 399                                       int signum,
 400                                       int count,
 401                                       void *siginfo,
 402                                       void *private_data)
 403 {
 404         winbindd_status();
 405 }
 406
 407 static bool winbindd_setup_sig_usr2_handler(void)
 408 {
 409         struct tevent_signal *se;
 410
 411         se = tevent_add_signal(winbind_event_context(),
 412                                winbind_event_context(),
 413                                SIGUSR2, 0,
 414                                winbindd_sig_usr2_handler,
 415                                NULL);
 416         if (!se) {
 417                 return false;
 418         }
 419
 420         return true;
 421 }
 422
 423 /* React on 'smbcontrol winbindd reload-config' in the same way as on SIGHUP*/
 424 static void msg_reload_services(struct messaging_context *msg,
 425                                 void *private_data,
 426                                 uint32_t msg_type,
 427                                 struct server_id server_id,
 428                                 DATA_BLOB *data)
 429 {
 430         /* Flush various caches */
 431         flush_caches();
 432         reload_services_file((const char *) private_data);
 433 }
 434
 435 /* React on 'smbcontrol winbindd shutdown' in the same way as on SIGTERM*/
 436 static void msg_shutdown(struct messaging_context *msg,
 437                          void *private_data,
 438                          uint32_t msg_type,
 439                          struct server_id server_id,
 440                          DATA_BLOB *data)
 441 {
 442         /* only the parent waits for this message */
 443         DEBUG(0,("Got shutdown message\n"));
 444         terminate(true);
 445 }
 446
 447
 448 static void winbind_msg_validate_cache(struct messaging_context *msg_ctx,
 449                                        void *private_data,
 450                                        uint32_t msg_type,
 451                                        struct server_id server_id,
 452                                        DATA_BLOB *data)
 453 {
 454         uint8 ret;
 455         pid_t child_pid;
 456         NTSTATUS status;
 457
 458         DEBUG(10, ("winbindd_msg_validate_cache: got validate-cache "
 459                    "message.\n"));
 460
 461         /*
 462          * call the validation code from a child:
 463          * so we don't block the main winbindd and the validation
 464          * code can safely use fork/waitpid...
 465          */
 466         child_pid = fork();
 467
 468         if (child_pid == -1) {
 469                 DEBUG(1, ("winbind_msg_validate_cache: Could not fork: %s\n",
 470                           strerror(errno)));
 471                 return;
 472         }
 473
 474         if (child_pid != 0) {
 475                 /* parent */
 476                 DEBUG(5, ("winbind_msg_validate_cache: child created with "
 477                           "pid %d.\n", (int)child_pid));
 478                 return;
 479         }
 480
 481         /* child */
 482
 483         status = winbindd_reinit_after_fork(NULL, NULL);
 484         if (!NT_STATUS_IS_OK(status)) {
 485                 DEBUG(1, ("winbindd_reinit_after_fork failed: %s\n",
 486                           nt_errstr(status)));
 487                 _exit(0);
 488         }
 489
 490         /* install default SIGCHLD handler: validation code uses fork/waitpid */
 491         CatchSignal(SIGCHLD, SIG_DFL);
 492
 493         ret = (uint8)winbindd_validate_cache_nobackup();
 494         DEBUG(10, ("winbindd_msg_validata_cache: got return value %d\n", ret));
 495         messaging_send_buf(msg_ctx, server_id, MSG_WINBIND_VALIDATE_CACHE, &ret,
 496                            (size_t)1);
 497         _exit(0);
 498 }
 499
 500 static struct winbindd_dispatch_table {
 501         enum winbindd_cmd cmd;
 502         void (*fn)(struct winbindd_cli_state *state);
 503         const char *winbindd_cmd_name;
 504 } dispatch_table[] = {
 505
 506         /* Enumeration functions */
 507
 508         { WINBINDD_LIST_TRUSTDOM, winbindd_list_trusted_domains,
 509           "LIST_TRUSTDOM" },
 510
 511         /* Miscellaneous */
 512
 513         { WINBINDD_INFO, winbindd_info, "INFO" },
 514         { WINBINDD_INTERFACE_VERSION, winbindd_interface_version,
 515           "INTERFACE_VERSION" },
 516         { WINBINDD_DOMAIN_NAME, winbindd_domain_name, "DOMAIN_NAME" },
 517         { WINBINDD_DOMAIN_INFO, winbindd_domain_info, "DOMAIN_INFO" },
 518         { WINBINDD_DC_INFO, winbindd_dc_info, "DC_INFO" },
 519         { WINBINDD_NETBIOS_NAME, winbindd_netbios_name, "NETBIOS_NAME" },
 520         { WINBINDD_PRIV_PIPE_DIR, winbindd_priv_pipe_dir,
 521           "WINBINDD_PRIV_PIPE_DIR" },
 522
 523         /* Credential cache access */
 524         { WINBINDD_CCACHE_NTLMAUTH, winbindd_ccache_ntlm_auth, "NTLMAUTH" },
 525         { WINBINDD_CCACHE_SAVE, winbindd_ccache_save, "CCACHE_SAVE" },
 526
 527         /* End of list */
 528
 529         { WINBINDD_NUM_CMDS, NULL, "NONE" }
 530 };
 531
 532 struct winbindd_async_dispatch_table {
 533         enum winbindd_cmd cmd;
 534         const char *cmd_name;
 535         struct tevent_req *(*send_req)(TALLOC_CTX *mem_ctx,
 536                                        struct tevent_context *ev,
 537                                        struct winbindd_cli_state *cli,
 538                                        struct winbindd_request *request);
 539         NTSTATUS (*recv_req)(struct tevent_req *req,
 540                              struct winbindd_response *presp);
 541 };
 542
 543 static struct winbindd_async_dispatch_table async_nonpriv_table[] = {
 544         { WINBINDD_PING, "PING",
 545           wb_ping_send, wb_ping_recv },
 546         { WINBINDD_LOOKUPSID, "LOOKUPSID",
 547           winbindd_lookupsid_send, winbindd_lookupsid_recv },
 548         { WINBINDD_LOOKUPSIDS, "LOOKUPSIDS",
 549           winbindd_lookupsids_send, winbindd_lookupsids_recv },
 550         { WINBINDD_LOOKUPNAME, "LOOKUPNAME",
 551           winbindd_lookupname_send, winbindd_lookupname_recv },
 552         { WINBINDD_SID_TO_UID, "SID_TO_UID",
 553           winbindd_sid_to_uid_send, winbindd_sid_to_uid_recv },
 554         { WINBINDD_SID_TO_GID, "SID_TO_GID",
 555           winbindd_sid_to_gid_send, winbindd_sid_to_gid_recv },
 556         { WINBINDD_UID_TO_SID, "UID_TO_SID",
 557           winbindd_uid_to_sid_send, winbindd_uid_to_sid_recv },
 558         { WINBINDD_GID_TO_SID, "GID_TO_SID",
 559           winbindd_gid_to_sid_send, winbindd_gid_to_sid_recv },
 560         { WINBINDD_SIDS_TO_XIDS, "SIDS_TO_XIDS",
 561           winbindd_sids_to_xids_send, winbindd_sids_to_xids_recv },
 562         { WINBINDD_GETPWSID, "GETPWSID",
 563           winbindd_getpwsid_send, winbindd_getpwsid_recv },
 564         { WINBINDD_GETPWNAM, "GETPWNAM",
 565           winbindd_getpwnam_send, winbindd_getpwnam_recv },
 566         { WINBINDD_GETPWUID, "GETPWUID",
 567           winbindd_getpwuid_send, winbindd_getpwuid_recv },
 568         { WINBINDD_GETSIDALIASES, "GETSIDALIASES",
 569           winbindd_getsidaliases_send, winbindd_getsidaliases_recv },
 570         { WINBINDD_GETUSERDOMGROUPS, "GETUSERDOMGROUPS",
 571           winbindd_getuserdomgroups_send, winbindd_getuserdomgroups_recv },
 572         { WINBINDD_GETGROUPS, "GETGROUPS",
 573           winbindd_getgroups_send, winbindd_getgroups_recv },
 574         { WINBINDD_SHOW_SEQUENCE, "SHOW_SEQUENCE",
 575           winbindd_show_sequence_send, winbindd_show_sequence_recv },
 576         { WINBINDD_GETGRGID, "GETGRGID",
 577           winbindd_getgrgid_send, winbindd_getgrgid_recv },
 578         { WINBINDD_GETGRNAM, "GETGRNAM",
 579           winbindd_getgrnam_send, winbindd_getgrnam_recv },
 580         { WINBINDD_GETUSERSIDS, "GETUSERSIDS",
 581           winbindd_getusersids_send, winbindd_getusersids_recv },
 582         { WINBINDD_LOOKUPRIDS, "LOOKUPRIDS",
 583           winbindd_lookuprids_send, winbindd_lookuprids_recv },
 584         { WINBINDD_SETPWENT, "SETPWENT",
 585           winbindd_setpwent_send, winbindd_setpwent_recv },
 586         { WINBINDD_GETPWENT, "GETPWENT",
 587           winbindd_getpwent_send, winbindd_getpwent_recv },
 588         { WINBINDD_ENDPWENT, "ENDPWENT",
 589           winbindd_endpwent_send, winbindd_endpwent_recv },
 590         { WINBINDD_DSGETDCNAME, "DSGETDCNAME",
 591           winbindd_dsgetdcname_send, winbindd_dsgetdcname_recv },
 592         { WINBINDD_GETDCNAME, "GETDCNAME",
 593           winbindd_getdcname_send, winbindd_getdcname_recv },
 594         { WINBINDD_SETGRENT, "SETGRENT",
 595           winbindd_setgrent_send, winbindd_setgrent_recv },
 596         { WINBINDD_GETGRENT, "GETGRENT",
 597           winbindd_getgrent_send, winbindd_getgrent_recv },
 598         { WINBINDD_ENDGRENT, "ENDGRENT",
 599           winbindd_endgrent_send, winbindd_endgrent_recv },
 600         { WINBINDD_LIST_USERS, "LIST_USERS",
 601           winbindd_list_users_send, winbindd_list_users_recv },
 602         { WINBINDD_LIST_GROUPS, "LIST_GROUPS",
 603           winbindd_list_groups_send, winbindd_list_groups_recv },
 604         { WINBINDD_CHECK_MACHACC, "CHECK_MACHACC",
 605           winbindd_check_machine_acct_send, winbindd_check_machine_acct_recv },
 606         { WINBINDD_PING_DC, "PING_DC",
 607           winbindd_ping_dc_send, winbindd_ping_dc_recv },
 608         { WINBINDD_PAM_AUTH, "PAM_AUTH",
 609           winbindd_pam_auth_send, winbindd_pam_auth_recv },
 610         { WINBINDD_PAM_LOGOFF, "PAM_LOGOFF",
 611           winbindd_pam_logoff_send, winbindd_pam_logoff_recv },
 612         { WINBINDD_PAM_CHAUTHTOK, "PAM_CHAUTHTOK",
 613           winbindd_pam_chauthtok_send, winbindd_pam_chauthtok_recv },
 614         { WINBINDD_PAM_CHNG_PSWD_AUTH_CRAP, "PAM_CHNG_PSWD_AUTH_CRAP",
 615           winbindd_pam_chng_pswd_auth_crap_send,
 616           winbindd_pam_chng_pswd_auth_crap_recv },
 617         { WINBINDD_WINS_BYIP, "WINS_BYIP",
 618           winbindd_wins_byip_send, winbindd_wins_byip_recv },
 619         { WINBINDD_WINS_BYNAME, "WINS_BYNAME",
 620           winbindd_wins_byname_send, winbindd_wins_byname_recv },
 621
 622         { 0, NULL, NULL, NULL }
 623 };
 624
 625 static struct winbindd_async_dispatch_table async_priv_table[] = {
 626         { WINBINDD_ALLOCATE_UID, "ALLOCATE_UID",
 627           winbindd_allocate_uid_send, winbindd_allocate_uid_recv },
 628         { WINBINDD_ALLOCATE_GID, "ALLOCATE_GID",
 629           winbindd_allocate_gid_send, winbindd_allocate_gid_recv },
 630         { WINBINDD_CHANGE_MACHACC, "CHANGE_MACHACC",
 631           winbindd_change_machine_acct_send, winbindd_change_machine_acct_recv },
 632         { WINBINDD_PAM_AUTH_CRAP, "PAM_AUTH_CRAP",
 633           winbindd_pam_auth_crap_send, winbindd_pam_auth_crap_recv },
 634
 635         { 0, NULL, NULL, NULL }
 636 };
 637
 638 static void wb_request_done(struct tevent_req *req);
 639
 640 static void process_request(struct winbindd_cli_state *state)
 641 {
 642         struct winbindd_dispatch_table *table = dispatch_table;
 643         struct winbindd_async_dispatch_table *atable;
 644
 645         state->mem_ctx = talloc_named(state, 0, "winbind request");
 646         if (state->mem_ctx == NULL)
 647                 return;
 648
 649         /* Remember who asked us. */
 650         state->pid = state->request->pid;
 651
 652         state->cmd_name = "unknown request";
 653         state->recv_fn = NULL;
 654         state->last_access = time(NULL);
 655
 656         /* Process command */
 657
 658         for (atable = async_nonpriv_table; atable->send_req; atable += 1) {
 659                 if (state->request->cmd == atable->cmd) {
 660                         break;
 661                 }
 662         }
 663
 664         if ((atable->send_req == NULL) && state->privileged) {
 665                 for (atable = async_priv_table; atable->send_req;
 666                      atable += 1) {
 667                         if (state->request->cmd == atable->cmd) {
 668                                 break;
 669                         }
 670                 }
 671         }
 672
 673         if (atable->send_req != NULL) {
 674                 struct tevent_req *req;
 675
 676                 state->cmd_name = atable->cmd_name;
 677                 state->recv_fn = atable->recv_req;
 678
 679                 DEBUG(10, ("process_request: Handling async request %d:%s\n",
 680                            (int)state->pid, state->cmd_name));
 681
 682                 req = atable->send_req(state->mem_ctx, winbind_event_context(),
 683                                        state, state->request);
 684                 if (req == NULL) {
 685                         DEBUG(0, ("process_request: atable->send failed for "
 686                                   "%s\n", atable->cmd_name));
 687                         request_error(state);
 688                         return;
 689                 }
 690                 tevent_req_set_callback(req, wb_request_done, state);
 691                 return;
 692         }
 693
 694         state->response = talloc_zero(state->mem_ctx,
 695                                       struct winbindd_response);
 696         if (state->response == NULL) {
 697                 DEBUG(10, ("talloc failed\n"));
 698                 remove_client(state);
 699                 return;
 700         }
 701         state->response->result = WINBINDD_PENDING;
 702         state->response->length = sizeof(struct winbindd_response);
 703
 704         for (table = dispatch_table; table->fn; table++) {
 705                 if (state->request->cmd == table->cmd) {
 706                         DEBUG(10,("process_request: request fn %s\n",
 707                                   table->winbindd_cmd_name ));
 708                         state->cmd_name = table->winbindd_cmd_name;
 709                         table->fn(state);
 710                         break;
 711                 }
 712         }
 713
 714         if (!table->fn) {
 715                 DEBUG(10,("process_request: unknown request fn number %d\n",
 716                           (int)state->request->cmd ));
 717                 request_error(state);
 718         }
 719 }
 720
 721 static void wb_request_done(struct tevent_req *req)
 722 {
 723         struct winbindd_cli_state *state = tevent_req_callback_data(
 724                 req, struct winbindd_cli_state);
 725         NTSTATUS status;
 726
 727         state->response = talloc_zero(state->mem_ctx,
 728                                       struct winbindd_response);
 729         if (state->response == NULL) {
 730                 DEBUG(0, ("wb_request_done[%d:%s]: talloc_zero failed - removing client\n",
 731                           (int)state->pid, state->cmd_name));
 732                 remove_client(state);
 733                 return;
 734         }
 735         state->response->result = WINBINDD_PENDING;
 736         state->response->length = sizeof(struct winbindd_response);
 737
 738         status = state->recv_fn(req, state->response);
 739         TALLOC_FREE(req);
 740
 741         DEBUG(10,("wb_request_done[%d:%s]: %s\n",
 742                   (int)state->pid, state->cmd_name, nt_errstr(status)));
 743
 744         if (!NT_STATUS_IS_OK(status)) {
 745                 request_error(state);
 746                 return;
 747         }
 748         request_ok(state);
 749 }
 750
 751 /*
 752  * This is the main event loop of winbind requests. It goes through a
 753  * state-machine of 3 read/write requests, 4 if you have extra data to send.
 754  *
 755  * An idle winbind client has a read request of 4 bytes outstanding,
 756  * finalizing function is request_len_recv, checking the length. request_recv
 757  * then processes the packet. The processing function then at some point has
 758  * to call request_finished which schedules sending the response.
 759  */
 760
 761 static void request_finished(struct winbindd_cli_state *state);
 762
 763 static void winbind_client_request_read(struct tevent_req *req);
 764 static void winbind_client_response_written(struct tevent_req *req);
 765
 766 static void request_finished(struct winbindd_cli_state *state)
 767 {
 768         struct tevent_req *req;
 769
 770         TALLOC_FREE(state->request);
 771
 772         req = wb_resp_write_send(state, winbind_event_context(),
 773                                  state->out_queue, state->sock,
 774                                  state->response);
 775         if (req == NULL) {
 776                 DEBUG(10,("request_finished[%d:%s]: wb_resp_write_send() failed\n",
 777                           (int)state->pid, state->cmd_name));
 778                 remove_client(state);
 779                 return;
 780         }
 781         tevent_req_set_callback(req, winbind_client_response_written, state);
 782 }
 783
 784 static void winbind_client_response_written(struct tevent_req *req)
 785 {
 786         struct winbindd_cli_state *state = tevent_req_callback_data(
 787                 req, struct winbindd_cli_state);
 788         ssize_t ret;
 789         int err;
 790
 791         ret = wb_resp_write_recv(req, &err);
 792         TALLOC_FREE(req);
 793         if (ret == -1) {
 794                 close(state->sock);
 795                 state->sock = -1;
 796                 DEBUG(2, ("Could not write response[%d:%s] to client: %s\n",
 797                           (int)state->pid, state->cmd_name, strerror(err)));
 798                 remove_client(state);
 799                 return;
 800         }
 801
 802         DEBUG(10,("winbind_client_response_written[%d:%s]: delivered response "
 803                   "to client\n", (int)state->pid, state->cmd_name));
 804
 805         TALLOC_FREE(state->mem_ctx);
 806         state->response = NULL;
 807         state->cmd_name = "no request";
 808         state->recv_fn = NULL;
 809
 810         req = wb_req_read_send(state, winbind_event_context(), state->sock,
 811                                WINBINDD_MAX_EXTRA_DATA);
 812         if (req == NULL) {
 813                 remove_client(state);
 814                 return;
 815         }
 816         tevent_req_set_callback(req, winbind_client_request_read, state);
 817 }
 818
 819 void request_error(struct winbindd_cli_state *state)
 820 {
 821         SMB_ASSERT(state->response->result == WINBINDD_PENDING);
 822         state->response->result = WINBINDD_ERROR;
 823         request_finished(state);
 824 }
 825
 826 void request_ok(struct winbindd_cli_state *state)
 827 {
 828         SMB_ASSERT(state->response->result == WINBINDD_PENDING);
 829         state->response->result = WINBINDD_OK;
 830         request_finished(state);
 831 }
 832
 833 /* Process a new connection by adding it to the client connection list */
 834
 835 static void new_connection(int listen_sock, bool privileged)
 836 {
 837         struct sockaddr_un sunaddr;
 838         struct winbindd_cli_state *state;
 839         struct tevent_req *req;
 840         socklen_t len;
 841         int sock;
 842
 843         /* Accept connection */
 844
 845         len = sizeof(sunaddr);
 846
 847         sock = accept(listen_sock, (struct sockaddr *)(void *)&sunaddr, &len);
 848
 849         if (sock == -1) {
 850                 if (errno != EINTR) {
 851                         DEBUG(0, ("Failed to accept socket - %s\n",
 852                                   strerror(errno)));
 853                 }
 854                 return;
 855         }
 856
 857         DEBUG(6,("accepted socket %d\n", sock));
 858
 859         /* Create new connection structure */
 860
 861         if ((state = talloc_zero(NULL, struct winbindd_cli_state)) == NULL) {
 862                 close(sock);
 863                 return;
 864         }
 865
 866         state->sock = sock;
 867
 868         state->out_queue = tevent_queue_create(state, "winbind client reply");
 869         if (state->out_queue == NULL) {
 870                 close(sock);
 871                 TALLOC_FREE(state);
 872                 return;
 873         }
 874
 875         state->last_access = time(NULL);
 876
 877         state->privileged = privileged;
 878
 879         req = wb_req_read_send(state, winbind_event_context(), state->sock,
 880                                WINBINDD_MAX_EXTRA_DATA);
 881         if (req == NULL) {
 882                 TALLOC_FREE(state);
 883                 close(sock);
 884                 return;
 885         }
 886         tevent_req_set_callback(req, winbind_client_request_read, state);
 887
 888         /* Add to connection list */
 889
 890         winbindd_add_client(state);
 891 }
 892
 893 static void winbind_client_request_read(struct tevent_req *req)
 894 {
 895         struct winbindd_cli_state *state = tevent_req_callback_data(
 896                 req, struct winbindd_cli_state);
 897         ssize_t ret;
 898         int err;
 899
 900         ret = wb_req_read_recv(req, state, &state->request, &err);
 901         TALLOC_FREE(req);
 902         if (ret == -1) {
 903                 if (err == EPIPE) {
 904                         DEBUG(6, ("closing socket %d, client exited\n",
 905                                   state->sock));
 906                 } else {
 907                         DEBUG(2, ("Could not read client request from fd %d: "
 908                                   "%s\n", state->sock, strerror(err)));
 909                 }
 910                 close(state->sock);
 911                 state->sock = -1;
 912                 remove_client(state);
 913                 return;
 914         }
 915         process_request(state);
 916 }
 917
 918 /* Remove a client connection from client connection list */
 919
 920 static void remove_client(struct winbindd_cli_state *state)
 921 {
 922         char c = 0;
 923         int nwritten;
 924
 925         /* It's a dead client - hold a funeral */
 926
 927         if (state == NULL) {
 928                 return;
 929         }
 930
 931         if (state->sock != -1) {
 932                 /* tell client, we are closing ... */
 933                 nwritten = write(state->sock, &c, sizeof(c));
 934                 if (nwritten == -1) {
 935                         DEBUG(2, ("final write to client failed: %s\n",
 936                                 strerror(errno)));
 937                 }
 938
 939                 /* Close socket */
 940
 941                 close(state->sock);
 942                 state->sock = -1;
 943         }
 944
 945         TALLOC_FREE(state->mem_ctx);
 946
 947         /* Remove from list and free */
 948
 949         winbindd_remove_client(state);
 950         TALLOC_FREE(state);
 951 }
 952
 953 /* Is a client idle? */
 954
 955 static bool client_is_idle(struct winbindd_cli_state *state) {
 956   return (state->request == NULL &&
 957           state->response == NULL &&
 958           !state->pwent_state && !state->grent_state);
 959 }
 960
 961 /* Shutdown client connection which has been idle for the longest time */
 962
 963 static bool remove_idle_client(void)
 964 {
 965         struct winbindd_cli_state *state, *remove_state = NULL;
 966         time_t last_access = 0;
 967         int nidle = 0;
 968
 969         for (state = winbindd_client_list(); state; state = state->next) {
 970                 if (client_is_idle(state)) {
 971                         nidle++;
 972                         if (!last_access || state->last_access < last_access) {
 973                                 last_access = state->last_access;
 974                                 remove_state = state;
 975                         }
 976                 }
 977         }
 978
 979         if (remove_state) {
 980                 DEBUG(5,("Found %d idle client connections, shutting down sock %d, pid %u\n",
 981                         nidle, remove_state->sock, (unsigned int)remove_state->pid));
 982                 remove_client(remove_state);
 983                 return True;
 984         }
 985
 986         return False;
 987 }
 988
 989 struct winbindd_listen_state {
 990         bool privileged;
 991         int fd;
 992 };
 993
 994 static void winbindd_listen_fde_handler(struct tevent_context *ev,
 995                                         struct tevent_fd *fde,
 996                                         uint16_t flags,
 997                                         void *private_data)
 998 {
 999         struct winbindd_listen_state *s = talloc_get_type_abort(private_data,
1000                                           struct winbindd_listen_state);
1001
1002         while (winbindd_num_clients() > lp_winbind_max_clients() - 1) {
1003                 DEBUG(5,("winbindd: Exceeding %d client "
1004                          "connections, removing idle "
1005                          "connection.\n", lp_winbind_max_clients()));
1006                 if (!remove_idle_client()) {
1007                         DEBUG(0,("winbindd: Exceeding %d "
1008                                  "client connections, no idle "
1009                                  "connection found\n",
1010                                  lp_winbind_max_clients()));
1011                         break;
1012                 }
1013         }
1014         new_connection(s->fd, s->privileged);
1015 }
1016
1017 /*
1018  * Winbindd socket accessor functions
1019  */
1020
1021 const char *get_winbind_pipe_dir(void)
1022 {
1023         return lp_parm_const_string(-1, "winbindd", "socket dir", get_dyn_WINBINDD_SOCKET_DIR());
1024 }
1025
1026 char *get_winbind_priv_pipe_dir(void)
1027 {
1028         return state_path(WINBINDD_PRIV_SOCKET_SUBDIR);
1029 }
1030
1031 static bool winbindd_setup_listeners(void)
1032 {
1033         struct winbindd_listen_state *pub_state = NULL;
1034         struct winbindd_listen_state *priv_state = NULL;
1035         struct tevent_fd *fde;
1036         int rc;
1037
1038         pub_state = talloc(winbind_event_context(),
1039                            struct winbindd_listen_state);
1040         if (!pub_state) {
1041                 goto failed;
1042         }
1043
1044         pub_state->privileged = false;
1045         pub_state->fd = create_pipe_sock(
1046                 get_winbind_pipe_dir(), WINBINDD_SOCKET_NAME, 0755);
1047         if (pub_state->fd == -1) {
1048                 goto failed;
1049         }
1050         rc = listen(pub_state->fd, 5);
1051         if (rc < 0) {
1052                 goto failed;
1053         }
1054
1055         fde = tevent_add_fd(winbind_event_context(), pub_state, pub_state->fd,
1056                             TEVENT_FD_READ, winbindd_listen_fde_handler,
1057                             pub_state);
1058         if (fde == NULL) {
1059                 close(pub_state->fd);
1060                 goto failed;
1061         }
1062         tevent_fd_set_auto_close(fde);
1063
1064         priv_state = talloc(winbind_event_context(),
1065                             struct winbindd_listen_state);
1066         if (!priv_state) {
1067                 goto failed;
1068         }
1069
1070         priv_state->privileged = true;
1071         priv_state->fd = create_pipe_sock(
1072                 get_winbind_priv_pipe_dir(), WINBINDD_SOCKET_NAME, 0750);
1073         if (priv_state->fd == -1) {
1074                 goto failed;
1075         }
1076         rc = listen(priv_state->fd, 5);
1077         if (rc < 0) {
1078                 goto failed;
1079         }
1080
1081         fde = tevent_add_fd(winbind_event_context(), priv_state,
1082                             priv_state->fd, TEVENT_FD_READ,
1083                             winbindd_listen_fde_handler, priv_state);
1084         if (fde == NULL) {
1085                 close(priv_state->fd);
1086                 goto failed;
1087         }
1088         tevent_fd_set_auto_close(fde);
1089
1090         return true;
1091 failed:
1092         TALLOC_FREE(pub_state);
1093         TALLOC_FREE(priv_state);
1094         return false;
1095 }
1096
1097 bool winbindd_use_idmap_cache(void)
1098 {
1099         return !opt_nocache;
1100 }
1101
1102 bool winbindd_use_cache(void)
1103 {
1104         return !opt_nocache;
1105 }
1106
1107 static void winbindd_register_handlers(struct messaging_context *msg_ctx,
1108                                        bool foreground)
1109 {
1110         /* Setup signal handlers */
1111
1112         if (!winbindd_setup_sig_term_handler(true))
1113                 exit(1);
1114         if (!winbindd_setup_stdin_handler(true, foreground))
1115                 exit(1);
1116         if (!winbindd_setup_sig_hup_handler(NULL))
1117                 exit(1);
1118         if (!winbindd_setup_sig_chld_handler())
1119                 exit(1);
1120         if (!winbindd_setup_sig_usr2_handler())
1121                 exit(1);
1122
1123         CatchSignal(SIGPIPE, SIG_IGN);                 /* Ignore sigpipe */
1124
1125         /*
1126          * Ensure all cache and idmap caches are consistent
1127          * and initialized before we startup.
1128          */
1129         if (!winbindd_cache_validate_and_initialize()) {
1130                 exit(1);
1131         }
1132
1133         /* get broadcast messages */
1134
1135         if (!serverid_register(messaging_server_id(msg_ctx),
1136                                FLAG_MSG_GENERAL |
1137                                FLAG_MSG_WINBIND |
1138                                FLAG_MSG_DBWRAP)) {
1139                 DEBUG(1, ("Could not register myself in serverid.tdb\n"));
1140                 exit(1);
1141         }
1142
1143         /* React on 'smbcontrol winbindd reload-config' in the same way
1144            as to SIGHUP signal */
1145         messaging_register(msg_ctx, NULL,
1146                            MSG_SMB_CONF_UPDATED, msg_reload_services);
1147         messaging_register(msg_ctx, NULL,
1148                            MSG_SHUTDOWN, msg_shutdown);
1149
1150         /* Handle online/offline messages. */
1151         messaging_register(msg_ctx, NULL,
1152                            MSG_WINBIND_OFFLINE, winbind_msg_offline);
1153         messaging_register(msg_ctx, NULL,
1154                            MSG_WINBIND_ONLINE, winbind_msg_online);
1155         messaging_register(msg_ctx, NULL,
1156                            MSG_WINBIND_ONLINESTATUS, winbind_msg_onlinestatus);
1157
1158         messaging_register(msg_ctx, NULL,
1159                            MSG_DUMP_EVENT_LIST, winbind_msg_dump_event_list);
1160
1161         messaging_register(msg_ctx, NULL,
1162                            MSG_WINBIND_VALIDATE_CACHE,
1163                            winbind_msg_validate_cache);
1164
1165         messaging_register(msg_ctx, NULL,
1166                            MSG_WINBIND_DUMP_DOMAIN_LIST,
1167                            winbind_msg_dump_domain_list);
1168
1169         messaging_register(msg_ctx, NULL,
1170                            MSG_WINBIND_IP_DROPPED,
1171                            winbind_msg_ip_dropped_parent);
1172
1173         /* Register handler for MSG_DEBUG. */
1174         messaging_register(msg_ctx, NULL,
1175                            MSG_DEBUG,
1176                            winbind_msg_debug);
1177
1178         netsamlogon_cache_init(); /* Non-critical */
1179
1180         /* clear the cached list of trusted domains */
1181
1182         wcache_tdc_clear();
1183
1184         if (!init_domain_list()) {
1185                 DEBUG(0,("unable to initialize domain list\n"));
1186                 exit(1);
1187         }
1188
1189         init_idmap_child();
1190         init_locator_child();
1191
1192         smb_nscd_flush_user_cache();
1193         smb_nscd_flush_group_cache();
1194
1195         if (lp_allow_trusted_domains()) {
1196                 if (tevent_add_timer(winbind_event_context(), NULL, timeval_zero(),
1197                               rescan_trusted_domains, NULL) == NULL) {
1198                         DEBUG(0, ("Could not trigger rescan_trusted_domains()\n"));
1199                         exit(1);
1200                 }
1201         }
1202
1203 }
1204
1205 struct winbindd_addrchanged_state {
1206         struct addrchange_context *ctx;
1207         struct tevent_context *ev;
1208         struct messaging_context *msg_ctx;
1209 };
1210
1211 static void winbindd_addr_changed(struct tevent_req *req);
1212
1213 static void winbindd_init_addrchange(TALLOC_CTX *mem_ctx,
1214                                      struct tevent_context *ev,
1215                                      struct messaging_context *msg_ctx)
1216 {
1217         struct winbindd_addrchanged_state *state;
1218         struct tevent_req *req;
1219         NTSTATUS status;
1220
1221         state = talloc(mem_ctx, struct winbindd_addrchanged_state);
1222         if (state == NULL) {
1223                 DEBUG(10, ("talloc failed\n"));
1224                 return;
1225         }
1226         state->ev = ev;
1227         state->msg_ctx = msg_ctx;
1228
1229         status = addrchange_context_create(state, &state->ctx);
1230         if (!NT_STATUS_IS_OK(status)) {
1231                 DEBUG(10, ("addrchange_context_create failed: %s\n",
1232                            nt_errstr(status)));
1233                 TALLOC_FREE(state);
1234                 return;
1235         }
1236         req = addrchange_send(state, ev, state->ctx);
1237         if (req == NULL) {
1238                 DEBUG(0, ("addrchange_send failed\n"));
1239                 TALLOC_FREE(state);
1240                 return;
1241         }
1242         tevent_req_set_callback(req, winbindd_addr_changed, state);
1243 }
1244
1245 static void winbindd_addr_changed(struct tevent_req *req)
1246 {
1247         struct winbindd_addrchanged_state *state = tevent_req_callback_data(
1248                 req, struct winbindd_addrchanged_state);
1249         enum addrchange_type type;
1250         struct sockaddr_storage addr;
1251         NTSTATUS status;
1252
1253         status = addrchange_recv(req, &type, &addr);
1254         TALLOC_FREE(req);
1255         if (!NT_STATUS_IS_OK(status)) {
1256                 DEBUG(10, ("addrchange_recv failed: %s, stop listening\n",
1257                            nt_errstr(status)));
1258                 TALLOC_FREE(state);
1259                 return;
1260         }
1261         if (type == ADDRCHANGE_DEL) {
1262                 char addrstr[INET6_ADDRSTRLEN];
1263                 DATA_BLOB blob;
1264
1265                 print_sockaddr(addrstr, sizeof(addrstr), &addr);
1266
1267                 DEBUG(3, ("winbindd: kernel (AF_NETLINK) dropped ip %s\n",
1268                           addrstr));
1269
1270                 blob = data_blob_const(addrstr, strlen(addrstr)+1);
1271
1272                 status = messaging_send(state->msg_ctx,
1273                                         messaging_server_id(state->msg_ctx),
1274                                         MSG_WINBIND_IP_DROPPED, &blob);
1275                 if (!NT_STATUS_IS_OK(status)) {
1276                         DEBUG(10, ("messaging_send failed: %s - ignoring\n",
1277                                    nt_errstr(status)));
1278                 }
1279         }
1280         req = addrchange_send(state, state->ev, state->ctx);
1281         if (req == NULL) {
1282                 DEBUG(0, ("addrchange_send failed\n"));
1283                 TALLOC_FREE(state);
1284                 return;
1285         }
1286         tevent_req_set_callback(req, winbindd_addr_changed, state);
1287 }
1288
1289 /* Main function */
1290
1291 int main(int argc, char **argv, char **envp)
1292 {
1293         static bool is_daemon = False;
1294         static bool Fork = True;
1295         static bool log_stdout = False;
1296         static bool no_process_group = False;
1297         enum {
1298                 OPT_DAEMON = 1000,
1299                 OPT_FORK,
1300                 OPT_NO_PROCESS_GROUP,
1301                 OPT_LOG_STDOUT
1302         };
1303         struct poptOption long_options[] = {
1304                 POPT_AUTOHELP
1305                 { "stdout", 'S', POPT_ARG_NONE, NULL, OPT_LOG_STDOUT, "Log to stdout" },
1306                 { "foreground", 'F', POPT_ARG_NONE, NULL, OPT_FORK, "Daemon in foreground mode" },
1307                 { "no-process-group", 0, POPT_ARG_NONE, NULL, OPT_NO_PROCESS_GROUP, "Don't create a new process group" },
1308                 { "daemon", 'D', POPT_ARG_NONE, NULL, OPT_DAEMON, "Become a daemon (default)" },
1309                 { "interactive", 'i', POPT_ARG_NONE, NULL, 'i', "Interactive mode" },
1310                 { "no-caching", 'n', POPT_ARG_NONE, NULL, 'n', "Disable caching" },
1311                 POPT_COMMON_SAMBA
1312                 POPT_TABLEEND
1313         };
1314         poptContext pc;
1315         int opt;
1316         TALLOC_CTX *frame;
1317         NTSTATUS status;
1318         bool ok;
1319
1320         /*
1321          * Do this before any other talloc operation
1322          */
1323         talloc_enable_null_tracking();
1324         frame = talloc_stackframe();
1325
1326         setup_logging("winbindd", DEBUG_DEFAULT_STDOUT);
1327
1328         /* glibc (?) likes to print "User defined signal 1" and exit if a
1329            SIGUSR[12] is received before a handler is installed */
1330
1331         CatchSignal(SIGUSR1, SIG_IGN);
1332         CatchSignal(SIGUSR2, SIG_IGN);
1333
1334         fault_setup();
1335         dump_core_setup("winbindd", lp_logfile(talloc_tos()));
1336
1337         load_case_tables();
1338
1339         /* Initialise for running in non-root mode */
1340
1341         sec_init();
1342
1343         set_remote_machine_name("winbindd", False);
1344
1345         /* Set environment variable so we don't recursively call ourselves.
1346            This may also be useful interactively. */
1347
1348         if ( !winbind_off() ) {
1349                 DEBUG(0,("Failed to disable recusive winbindd calls.  Exiting.\n"));
1350                 exit(1);
1351         }
1352
1353         /* Initialise samba/rpc client stuff */
1354
1355         pc = poptGetContext("winbindd", argc, (const char **)argv, long_options, 0);
1356
1357         while ((opt = poptGetNextOpt(pc)) != -1) {
1358                 switch (opt) {
1359                         /* Don't become a daemon */
1360                 case OPT_DAEMON:
1361                         is_daemon = True;
1362                         break;
1363                 case 'i':
1364                         interactive = True;
1365                         log_stdout = True;
1366                         Fork = False;
1367                         break;
1368                 case OPT_FORK:
1369                         Fork = false;
1370                         break;
1371                 case OPT_NO_PROCESS_GROUP:
1372                         no_process_group = true;
1373                         break;
1374                 case OPT_LOG_STDOUT:
1375                         log_stdout = true;
1376                         break;
1377                 case 'n':
1378                         opt_nocache = true;
1379                         break;
1380                 default:
1381                         d_fprintf(stderr, "\nInvalid option %s: %s\n\n",
1382                                   poptBadOption(pc, 0), poptStrerror(opt));
1383                         poptPrintUsage(pc, stderr, 0);
1384                         exit(1);
1385                 }
1386         }
1387
1388         /* We call dump_core_setup one more time because the command line can
1389          * set the log file or the log-basename and this will influence where
1390          * cores are stored. Without this call get_dyn_LOGFILEBASE will be
1391          * the default value derived from build's prefix. For EOM this value
1392          * is often not related to the path where winbindd is actually run
1393          * in production.
1394          */
1395         dump_core_setup("winbindd", lp_logfile(talloc_tos()));
1396         if (is_daemon && interactive) {
1397                 d_fprintf(stderr,"\nERROR: "
1398                           "Option -i|--interactive is not allowed together with -D|--daemon\n\n");
1399                 poptPrintUsage(pc, stderr, 0);
1400                 exit(1);
1401         }
1402
1403         if (log_stdout && Fork) {
1404                 d_fprintf(stderr, "\nERROR: "
1405                           "Can't log to stdout (-S) unless daemon is in foreground +(-F) or interactive (-i)\n\n");
1406                 poptPrintUsage(pc, stderr, 0);
1407                 exit(1);
1408         }
1409
1410         poptFreeContext(pc);
1411
1412         if (!override_logfile) {
1413                 char *lfile = NULL;
1414                 if (asprintf(&lfile,"%s/log.winbindd",
1415                                 get_dyn_LOGFILEBASE()) > 0) {
1416                         lp_set_logfile(lfile);
1417                         SAFE_FREE(lfile);
1418                 }
1419         }
1420
1421         if (log_stdout) {
1422                 setup_logging("winbindd", DEBUG_STDOUT);
1423         } else {
1424                 setup_logging("winbindd", DEBUG_FILE);
1425         }
1426         reopen_logs();
1427
1428         DEBUG(0,("winbindd version %s started.\n", samba_version_string()));
1429         DEBUGADD(0,("%s\n", COPYRIGHT_STARTUP_MESSAGE));
1430
1431         if (!lp_load_initial_only(get_dyn_CONFIGFILE())) {
1432                 DEBUG(0, ("error opening config file '%s'\n", get_dyn_CONFIGFILE()));
1433                 exit(1);
1434         }
1435         /* After parsing the configuration file we setup the core path one more time
1436          * as the log file might have been set in the configuration and cores's
1437          * path is by default basename(lp_logfile()).
1438          */
1439         dump_core_setup("winbindd", lp_logfile(talloc_tos()));
1440
1441         if (lp_server_role() == ROLE_ACTIVE_DIRECTORY_DC) {
1442                 DEBUG(0, ("server role = 'active directory domain controller' not compatible with running the winbindd binary. \n"));
1443                 DEBUGADD(0, ("You should start 'samba' instead, and it will control starting the internal AD DC winbindd implementation, which is not the same as this one\n"));
1444                 exit(1);
1445         }
1446
1447         /* Initialise messaging system */
1448
1449         if (winbind_messaging_context() == NULL) {
1450                 exit(1);
1451         }
1452
1453         if (!reload_services_file(NULL)) {
1454                 DEBUG(0, ("error opening config file\n"));
1455                 exit(1);
1456         }
1457
1458         ok = directory_create_or_exist(lp_lockdir(), geteuid(), 0755);
1459         if (!ok) {
1460                 DEBUG(0, ("Failed to create directory %s for lock files - %s\n",
1461                           lp_lockdir(), strerror(errno)));
1462                 exit(1);
1463         }
1464
1465         ok = directory_create_or_exist(lp_piddir(), geteuid(), 0755);
1466         if (!ok) {
1467                 DEBUG(0, ("Failed to create directory %s for pid files - %s\n",
1468                           lp_piddir(), strerror(errno)));
1469                 exit(1);
1470         }
1471
1472         /* Setup names. */
1473
1474         if (!init_names())
1475                 exit(1);
1476
1477         load_interfaces();
1478
1479         if (!secrets_init()) {
1480
1481                 DEBUG(0,("Could not initialize domain trust account secrets. Giving up\n"));
1482                 return False;
1483         }
1484
1485         /* Unblock all signals we are interested in as they may have been
1486            blocked by the parent process. */
1487
1488         BlockSignals(False, SIGINT);
1489         BlockSignals(False, SIGQUIT);
1490         BlockSignals(False, SIGTERM);
1491         BlockSignals(False, SIGUSR1);
1492         BlockSignals(False, SIGUSR2);
1493         BlockSignals(False, SIGHUP);
1494         BlockSignals(False, SIGCHLD);
1495
1496         if (!interactive)
1497                 become_daemon(Fork, no_process_group, log_stdout);
1498
1499         pidfile_create(lp_piddir(), "winbindd");
1500
1501 #if HAVE_SETPGID
1502         /*
1503          * If we're interactive we want to set our own process group for
1504          * signal management.
1505          */
1506         if (interactive && !no_process_group)
1507                 setpgid( (pid_t)0, (pid_t)0);
1508 #endif
1509
1510         TimeInit();
1511
1512         /* Don't use winbindd_reinit_after_fork here as
1513          * we're just starting up and haven't created any
1514          * winbindd-specific resources we must free yet. JRA.
1515          */
1516
1517         status = reinit_after_fork(winbind_messaging_context(),
1518                                    winbind_event_context(),
1519                                    false);
1520         if (!NT_STATUS_IS_OK(status)) {
1521                 DEBUG(0,("reinit_after_fork() failed\n"));
1522                 exit(1);
1523         }
1524
1525         /*
1526          * Do not initialize the parent-child-pipe before becoming
1527          * a daemon: this is used to detect a died parent in the child
1528          * process.
1529          */
1530         status = init_before_fork();
1531         if (!NT_STATUS_IS_OK(status)) {
1532                 DEBUG(0, ("init_before_fork failed: %s\n", nt_errstr(status)));
1533                 exit(1);
1534         }
1535
1536         winbindd_register_handlers(winbind_messaging_context(), !Fork);
1537
1538         status = init_system_session_info();
1539         if (!NT_STATUS_IS_OK(status)) {
1540                 DEBUG(1, ("ERROR: failed to setup system user info: %s.\n",
1541                           nt_errstr(status)));
1542                 exit(1);
1543         }
1544
1545         rpc_lsarpc_init(NULL);
1546         rpc_samr_init(NULL);
1547
1548         winbindd_init_addrchange(NULL, winbind_event_context(),
1549                                  winbind_messaging_context());
1550
1551         /* setup listen sockets */
1552
1553         if (!winbindd_setup_listeners()) {
1554                 DEBUG(0,("winbindd_setup_listeners() failed\n"));
1555                 exit(1);
1556         }
1557
1558         TALLOC_FREE(frame);
1559         /* Loop waiting for requests */
1560         while (1) {
1561                 frame = talloc_stackframe();
1562
1563                 if (tevent_loop_once(winbind_event_context()) == -1) {
1564                         DEBUG(1, ("tevent_loop_once() failed: %s\n",
1565                                   strerror(errno)));
1566                         return 1;
1567                 }
1568
1569                 TALLOC_FREE(frame);
1570         }
1571
1572         return 0;
1573 }