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