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_GETPWNAM, winbindd_getpwnam, "GETPWNAM" },
 431         { WINBINDD_GETPWUID, winbindd_getpwuid, "GETPWUID" },
 432         { WINBINDD_GETPWSID, winbindd_getpwsid, "GETPWSID" },
 433
 434         { WINBINDD_SETPWENT, winbindd_setpwent, "SETPWENT" },
 435         { WINBINDD_ENDPWENT, winbindd_endpwent, "ENDPWENT" },
 436         { WINBINDD_GETPWENT, winbindd_getpwent, "GETPWENT" },
 437
 438         { WINBINDD_GETGROUPS, winbindd_getgroups, "GETGROUPS" },
 439         { WINBINDD_GETUSERSIDS, winbindd_getusersids, "GETUSERSIDS" },
 440         { WINBINDD_GETUSERDOMGROUPS, winbindd_getuserdomgroups,
 441           "GETUSERDOMGROUPS" },
 442         { WINBINDD_GETSIDALIASES, winbindd_getsidaliases,
 443            "LOOKUPUSERALIASES" },
 444
 445         /* Group functions */
 446
 447         { WINBINDD_GETGRNAM, winbindd_getgrnam, "GETGRNAM" },
 448         { WINBINDD_GETGRGID, winbindd_getgrgid, "GETGRGID" },
 449         { WINBINDD_SETGRENT, winbindd_setgrent, "SETGRENT" },
 450         { WINBINDD_ENDGRENT, winbindd_endgrent, "ENDGRENT" },
 451         { WINBINDD_GETGRENT, winbindd_getgrent, "GETGRENT" },
 452         { WINBINDD_GETGRLST, winbindd_getgrent, "GETGRLST" },
 453
 454         /* PAM auth functions */
 455
 456         { WINBINDD_PAM_AUTH, winbindd_pam_auth, "PAM_AUTH" },
 457         { WINBINDD_PAM_AUTH_CRAP, winbindd_pam_auth_crap, "AUTH_CRAP" },
 458         { WINBINDD_PAM_CHAUTHTOK, winbindd_pam_chauthtok, "CHAUTHTOK" },
 459         { WINBINDD_PAM_LOGOFF, winbindd_pam_logoff, "PAM_LOGOFF" },
 460         { WINBINDD_PAM_CHNG_PSWD_AUTH_CRAP, winbindd_pam_chng_pswd_auth_crap, "CHNG_PSWD_AUTH_CRAP" },
 461
 462         /* Enumeration functions */
 463
 464         { WINBINDD_LIST_USERS, winbindd_list_users, "LIST_USERS" },
 465         { WINBINDD_LIST_GROUPS, winbindd_list_groups, "LIST_GROUPS" },
 466         { WINBINDD_LIST_TRUSTDOM, winbindd_list_trusted_domains,
 467           "LIST_TRUSTDOM" },
 468         { WINBINDD_SHOW_SEQUENCE, winbindd_show_sequence, "SHOW_SEQUENCE" },
 469
 470         /* SID related functions */
 471
 472         { WINBINDD_LOOKUPRIDS, winbindd_lookuprids, "LOOKUPRIDS" },
 473
 474         /* Lookup related functions */
 475
 476         { WINBINDD_UID_TO_SID, winbindd_uid_to_sid, "UID_TO_SID" },
 477         { WINBINDD_GID_TO_SID, winbindd_gid_to_sid, "GID_TO_SID" },
 478         { WINBINDD_ALLOCATE_UID, winbindd_allocate_uid, "ALLOCATE_UID" },
 479         { WINBINDD_ALLOCATE_GID, winbindd_allocate_gid, "ALLOCATE_GID" },
 480         { WINBINDD_SET_MAPPING, winbindd_set_mapping, "SET_MAPPING" },
 481         { WINBINDD_REMOVE_MAPPING, winbindd_remove_mapping, "REMOVE_MAPPING" },
 482         { WINBINDD_SET_HWM, winbindd_set_hwm, "SET_HWMS" },
 483
 484         /* Miscellaneous */
 485
 486         { WINBINDD_CHECK_MACHACC, winbindd_check_machine_acct, "CHECK_MACHACC" },
 487         { WINBINDD_INFO, winbindd_info, "INFO" },
 488         { WINBINDD_INTERFACE_VERSION, winbindd_interface_version,
 489           "INTERFACE_VERSION" },
 490         { WINBINDD_DOMAIN_NAME, winbindd_domain_name, "DOMAIN_NAME" },
 491         { WINBINDD_DOMAIN_INFO, winbindd_domain_info, "DOMAIN_INFO" },
 492         { WINBINDD_NETBIOS_NAME, winbindd_netbios_name, "NETBIOS_NAME" },
 493         { WINBINDD_PRIV_PIPE_DIR, winbindd_priv_pipe_dir,
 494           "WINBINDD_PRIV_PIPE_DIR" },
 495         { WINBINDD_GETDCNAME, winbindd_getdcname, "GETDCNAME" },
 496         { WINBINDD_DSGETDCNAME, winbindd_dsgetdcname, "DSGETDCNAME" },
 497
 498         /* Credential cache access */
 499         { WINBINDD_CCACHE_NTLMAUTH, winbindd_ccache_ntlm_auth, "NTLMAUTH" },
 500
 501         /* WINS functions */
 502
 503         { WINBINDD_WINS_BYNAME, winbindd_wins_byname, "WINS_BYNAME" },
 504         { WINBINDD_WINS_BYIP, winbindd_wins_byip, "WINS_BYIP" },
 505
 506         /* End of list */
 507
 508         { WINBINDD_NUM_CMDS, NULL, "NONE" }
 509 };
 510
 511 struct winbindd_async_dispatch_table {
 512         enum winbindd_cmd cmd;
 513         const char *cmd_name;
 514         struct tevent_req *(*send_req)(TALLOC_CTX *mem_ctx,
 515                                        struct tevent_context *ev,
 516                                        struct winbindd_request *request);
 517         NTSTATUS (*recv_req)(struct tevent_req *req,
 518                              struct winbindd_response *presp);
 519 };
 520
 521 static struct winbindd_async_dispatch_table async_nonpriv_table[] = {
 522         { WINBINDD_PING, "PING",
 523           wb_ping_send, wb_ping_recv },
 524         { WINBINDD_LOOKUPSID, "LOOKUPSID",
 525           winbindd_lookupsid_send, winbindd_lookupsid_recv },
 526         { WINBINDD_LOOKUPNAME, "LOOKUPNAME",
 527           winbindd_lookupname_send, winbindd_lookupname_recv },
 528         { WINBINDD_SID_TO_UID, "SID_TO_UID",
 529           winbindd_sid_to_uid_send, winbindd_sid_to_uid_recv },
 530         { WINBINDD_SID_TO_GID, "SID_TO_GID",
 531           winbindd_sid_to_gid_send, winbindd_sid_to_gid_recv },
 532
 533         { 0, NULL, NULL, NULL }
 534 };
 535
 536 static void wb_request_done(struct tevent_req *req);
 537
 538 static void process_request(struct winbindd_cli_state *state)
 539 {
 540         struct winbindd_dispatch_table *table = dispatch_table;
 541         struct winbindd_async_dispatch_table *atable;
 542
 543         state->mem_ctx = talloc_init("winbind request");
 544         if (state->mem_ctx == NULL)
 545                 return;
 546
 547         /* Remember who asked us. */
 548         state->pid = state->request->pid;
 549
 550         /* Process command */
 551
 552         for (atable = async_nonpriv_table; atable->send_req; atable += 1) {
 553                 if (state->request->cmd == atable->cmd) {
 554                         break;
 555                 }
 556         }
 557
 558         if (atable->send_req != NULL) {
 559                 struct tevent_req *req;
 560
 561                 DEBUG(10, ("process_request: Handling async request %s\n",
 562                            atable->cmd_name));
 563
 564                 req = atable->send_req(state->mem_ctx, winbind_event_context(),
 565                                        state->request);
 566                 if (req == NULL) {
 567                         DEBUG(0, ("process_request: atable->send failed for "
 568                                   "%s\n", atable->cmd_name));
 569                         request_error(state);
 570                         return;
 571                 }
 572                 tevent_req_set_callback(req, wb_request_done, state);
 573                 state->recv_fn = atable->recv_req;
 574                 return;
 575         }
 576
 577         state->response = talloc_zero(state->mem_ctx,
 578                                       struct winbindd_response);
 579         if (state->response == NULL) {
 580                 DEBUG(10, ("talloc failed\n"));
 581                 remove_client(state);
 582                 return;
 583         }
 584         state->response->result = WINBINDD_PENDING;
 585         state->response->length = sizeof(struct winbindd_response);
 586
 587         for (table = dispatch_table; table->fn; table++) {
 588                 if (state->request->cmd == table->cmd) {
 589                         DEBUG(10,("process_request: request fn %s\n",
 590                                   table->winbindd_cmd_name ));
 591                         table->fn(state);
 592                         break;
 593                 }
 594         }
 595
 596         if (!table->fn) {
 597                 DEBUG(10,("process_request: unknown request fn number %d\n",
 598                           (int)state->request->cmd ));
 599                 request_error(state);
 600         }
 601 }
 602
 603 static void wb_request_done(struct tevent_req *req)
 604 {
 605         struct winbindd_cli_state *state = tevent_req_callback_data(
 606                 req, struct winbindd_cli_state);
 607         NTSTATUS status;
 608
 609         state->response = talloc_zero(state, struct winbindd_response);
 610         if (state->response == NULL) {
 611                 remove_client(state);
 612                 return;
 613         }
 614         state->response->result = WINBINDD_PENDING;
 615         state->response->length = sizeof(struct winbindd_response);
 616
 617         status = state->recv_fn(req, state->response);
 618         TALLOC_FREE(req);
 619         if (!NT_STATUS_IS_OK(status)) {
 620                 DEBUG(10, ("returning %s\n", nt_errstr(status)));
 621                 request_error(state);
 622                 return;
 623         }
 624         request_ok(state);
 625 }
 626
 627 /*
 628  * This is the main event loop of winbind requests. It goes through a
 629  * state-machine of 3 read/write requests, 4 if you have extra data to send.
 630  *
 631  * An idle winbind client has a read request of 4 bytes outstanding,
 632  * finalizing function is request_len_recv, checking the length. request_recv
 633  * then processes the packet. The processing function then at some point has
 634  * to call request_finished which schedules sending the response.
 635  */
 636
 637 static void request_finished(struct winbindd_cli_state *state);
 638
 639 static void winbind_client_request_read(struct tevent_req *req);
 640 static void winbind_client_response_written(struct tevent_req *req);
 641
 642 static void request_finished(struct winbindd_cli_state *state)
 643 {
 644         struct tevent_req *req;
 645
 646         TALLOC_FREE(state->request);
 647
 648         req = wb_resp_write_send(state, winbind_event_context(),
 649                                  state->out_queue, state->sock,
 650                                  state->response);
 651         if (req == NULL) {
 652                 remove_client(state);
 653                 return;
 654         }
 655         tevent_req_set_callback(req, winbind_client_response_written, state);
 656 }
 657
 658 static void winbind_client_response_written(struct tevent_req *req)
 659 {
 660         struct winbindd_cli_state *state = tevent_req_callback_data(
 661                 req, struct winbindd_cli_state);
 662         ssize_t ret;
 663         int err;
 664
 665         ret = wb_resp_write_recv(req, &err);
 666         TALLOC_FREE(req);
 667         if (ret == -1) {
 668                 DEBUG(2, ("Could not write response to client: %s\n",
 669                           strerror(err)));
 670                 remove_client(state);
 671                 return;
 672         }
 673
 674         TALLOC_FREE(state->mem_ctx);
 675         state->response = NULL;
 676
 677         req = wb_req_read_send(state, winbind_event_context(), state->sock,
 678                                WINBINDD_MAX_EXTRA_DATA);
 679         if (req == NULL) {
 680                 remove_client(state);
 681                 return;
 682         }
 683         tevent_req_set_callback(req, winbind_client_request_read, state);
 684 }
 685
 686 void request_error(struct winbindd_cli_state *state)
 687 {
 688         SMB_ASSERT(state->response->result == WINBINDD_PENDING);
 689         state->response->result = WINBINDD_ERROR;
 690         request_finished(state);
 691 }
 692
 693 void request_ok(struct winbindd_cli_state *state)
 694 {
 695         SMB_ASSERT(state->response->result == WINBINDD_PENDING);
 696         state->response->result = WINBINDD_OK;
 697         request_finished(state);
 698 }
 699
 700 /* Process a new connection by adding it to the client connection list */
 701
 702 static void new_connection(int listen_sock, bool privileged)
 703 {
 704         struct sockaddr_un sunaddr;
 705         struct winbindd_cli_state *state;
 706         struct tevent_req *req;
 707         socklen_t len;
 708         int sock;
 709
 710         /* Accept connection */
 711
 712         len = sizeof(sunaddr);
 713
 714         do {
 715                 sock = accept(listen_sock, (struct sockaddr *)(void *)&sunaddr,
 716                               &len);
 717         } while (sock == -1 && errno == EINTR);
 718
 719         if (sock == -1)
 720                 return;
 721
 722         DEBUG(6,("accepted socket %d\n", sock));
 723
 724         /* Create new connection structure */
 725
 726         if ((state = TALLOC_ZERO_P(NULL, struct winbindd_cli_state)) == NULL) {
 727                 close(sock);
 728                 return;
 729         }
 730
 731         state->sock = sock;
 732
 733         state->out_queue = tevent_queue_create(state, "winbind client reply");
 734         if (state->out_queue == NULL) {
 735                 close(sock);
 736                 TALLOC_FREE(state);
 737                 return;
 738         }
 739
 740         state->last_access = time(NULL);
 741
 742         state->privileged = privileged;
 743
 744         req = wb_req_read_send(state, winbind_event_context(), state->sock,
 745                                WINBINDD_MAX_EXTRA_DATA);
 746         if (req == NULL) {
 747                 TALLOC_FREE(state);
 748                 close(sock);
 749                 return;
 750         }
 751         tevent_req_set_callback(req, winbind_client_request_read, state);
 752
 753         /* Add to connection list */
 754
 755         winbindd_add_client(state);
 756 }
 757
 758 static void winbind_client_request_read(struct tevent_req *req)
 759 {
 760         struct winbindd_cli_state *state = tevent_req_callback_data(
 761                 req, struct winbindd_cli_state);
 762         ssize_t ret;
 763         int err;
 764
 765         ret = wb_req_read_recv(req, state, &state->request, &err);
 766         TALLOC_FREE(req);
 767         if (ret == -1) {
 768                 DEBUG(2, ("Could not read client request: %s\n",
 769                           strerror(err)));
 770                 remove_client(state);
 771                 return;
 772         }
 773         process_request(state);
 774 }
 775
 776 /* Remove a client connection from client connection list */
 777
 778 static void remove_client(struct winbindd_cli_state *state)
 779 {
 780         char c = 0;
 781         int nwritten;
 782
 783         /* It's a dead client - hold a funeral */
 784
 785         if (state == NULL) {
 786                 return;
 787         }
 788
 789         /* tell client, we are closing ... */
 790         nwritten = write(state->sock, &c, sizeof(c));
 791         if (nwritten == -1) {
 792                 /*
 793                  * ignore EPIPE error here, because the other end might
 794                  * have already closed the socket.
 795                  */
 796                 if (errno != EPIPE) {
 797                         DEBUG(2, ("final write to client failed: %s\n",
 798                                 strerror(errno)));
 799                 }
 800         }
 801
 802         /* Close socket */
 803
 804         close(state->sock);
 805
 806         /* Free any getent state */
 807
 808         free_getent_state(state->getpwent_state);
 809         free_getent_state(state->getgrent_state);
 810
 811         TALLOC_FREE(state->mem_ctx);
 812
 813         /* Remove from list and free */
 814
 815         winbindd_remove_client(state);
 816         TALLOC_FREE(state);
 817 }
 818
 819 /* Shutdown client connection which has been idle for the longest time */
 820
 821 static bool remove_idle_client(void)
 822 {
 823         struct winbindd_cli_state *state, *remove_state = NULL;
 824         time_t last_access = 0;
 825         int nidle = 0;
 826
 827         for (state = winbindd_client_list(); state; state = state->next) {
 828                 if (state->response == NULL &&
 829                     !state->getpwent_state && !state->getgrent_state) {
 830                         nidle++;
 831                         if (!last_access || state->last_access < last_access) {
 832                                 last_access = state->last_access;
 833                                 remove_state = state;
 834                         }
 835                 }
 836         }
 837
 838         if (remove_state) {
 839                 DEBUG(5,("Found %d idle client connections, shutting down sock %d, pid %u\n",
 840                         nidle, remove_state->sock, (unsigned int)remove_state->pid));
 841                 remove_client(remove_state);
 842                 return True;
 843         }
 844
 845         return False;
 846 }
 847
 848 struct winbindd_listen_state {
 849         bool privileged;
 850         int fd;
 851 };
 852
 853 static void winbindd_listen_fde_handler(struct tevent_context *ev,
 854                                         struct tevent_fd *fde,
 855                                         uint16_t flags,
 856                                         void *private_data)
 857 {
 858         struct winbindd_listen_state *s = talloc_get_type_abort(private_data,
 859                                           struct winbindd_listen_state);
 860
 861         while (winbindd_num_clients() >
 862                WINBINDD_MAX_SIMULTANEOUS_CLIENTS - 1) {
 863                 DEBUG(5,("winbindd: Exceeding %d client "
 864                          "connections, removing idle "
 865                          "connection.\n",
 866                          WINBINDD_MAX_SIMULTANEOUS_CLIENTS));
 867                 if (!remove_idle_client()) {
 868                         DEBUG(0,("winbindd: Exceeding %d "
 869                                  "client connections, no idle "
 870                                  "connection found\n",
 871                                  WINBINDD_MAX_SIMULTANEOUS_CLIENTS));
 872                         break;
 873                 }
 874         }
 875         new_connection(s->fd, s->privileged);
 876 }
 877
 878 static bool winbindd_setup_listeners(void)
 879 {
 880         struct winbindd_listen_state *pub_state = NULL;
 881         struct winbindd_listen_state *priv_state = NULL;
 882         struct tevent_fd *fde;
 883
 884         pub_state = talloc(winbind_event_context(),
 885                            struct winbindd_listen_state);
 886         if (!pub_state) {
 887                 goto failed;
 888         }
 889
 890         pub_state->privileged = false;
 891         pub_state->fd = open_winbindd_socket();
 892         if (pub_state->fd == -1) {
 893                 goto failed;
 894         }
 895
 896         fde = tevent_add_fd(winbind_event_context(), pub_state, pub_state->fd,
 897                             TEVENT_FD_READ, winbindd_listen_fde_handler,
 898                             pub_state);
 899         if (fde == NULL) {
 900                 close(pub_state->fd);
 901                 goto failed;
 902         }
 903         tevent_fd_set_auto_close(fde);
 904
 905         priv_state = talloc(winbind_event_context(),
 906                             struct winbindd_listen_state);
 907         if (!priv_state) {
 908                 goto failed;
 909         }
 910
 911         priv_state->privileged = true;
 912         priv_state->fd = open_winbindd_priv_socket();
 913         if (priv_state->fd == -1) {
 914                 goto failed;
 915         }
 916
 917         fde = tevent_add_fd(winbind_event_context(), priv_state,
 918                             priv_state->fd, TEVENT_FD_READ,
 919                             winbindd_listen_fde_handler, priv_state);
 920         if (fde == NULL) {
 921                 close(priv_state->fd);
 922                 goto failed;
 923         }
 924         tevent_fd_set_auto_close(fde);
 925
 926         return true;
 927 failed:
 928         TALLOC_FREE(pub_state);
 929         TALLOC_FREE(priv_state);
 930         return false;
 931 }
 932
 933 bool winbindd_use_idmap_cache(void)
 934 {
 935         return !opt_nocache;
 936 }
 937
 938 bool winbindd_use_cache(void)
 939 {
 940         return !opt_nocache;
 941 }
 942
 943 /* Main function */
 944
 945 int main(int argc, char **argv, char **envp)
 946 {
 947         static bool is_daemon = False;
 948         static bool Fork = True;
 949         static bool log_stdout = False;
 950         static bool no_process_group = False;
 951         enum {
 952                 OPT_DAEMON = 1000,
 953                 OPT_FORK,
 954                 OPT_NO_PROCESS_GROUP,
 955                 OPT_LOG_STDOUT
 956         };
 957         struct poptOption long_options[] = {
 958                 POPT_AUTOHELP
 959                 { "stdout", 'S', POPT_ARG_NONE, NULL, OPT_LOG_STDOUT, "Log to stdout" },
 960                 { "foreground", 'F', POPT_ARG_NONE, NULL, OPT_FORK, "Daemon in foreground mode" },
 961                 { "no-process-group", 0, POPT_ARG_NONE, NULL, OPT_NO_PROCESS_GROUP, "Don't create a new process group" },
 962                 { "daemon", 'D', POPT_ARG_NONE, NULL, OPT_DAEMON, "Become a daemon (default)" },
 963                 { "interactive", 'i', POPT_ARG_NONE, NULL, 'i', "Interactive mode" },
 964                 { "no-caching", 'n', POPT_ARG_NONE, NULL, 'n', "Disable caching" },
 965                 POPT_COMMON_SAMBA
 966                 POPT_TABLEEND
 967         };
 968         poptContext pc;
 969         int opt;
 970         TALLOC_CTX *frame = talloc_stackframe();
 971         struct tevent_timer *te;
 972
 973         /* glibc (?) likes to print "User defined signal 1" and exit if a
 974            SIGUSR[12] is received before a handler is installed */
 975
 976         CatchSignal(SIGUSR1, SIG_IGN);
 977         CatchSignal(SIGUSR2, SIG_IGN);
 978
 979         fault_setup((void (*)(void *))fault_quit );
 980         dump_core_setup("winbindd");
 981
 982         load_case_tables();
 983
 984         /* Initialise for running in non-root mode */
 985
 986         sec_init();
 987
 988         set_remote_machine_name("winbindd", False);
 989
 990         /* Set environment variable so we don't recursively call ourselves.
 991            This may also be useful interactively. */
 992
 993         if ( !winbind_off() ) {
 994                 DEBUG(0,("Failed to disable recusive winbindd calls.  Exiting.\n"));
 995                 exit(1);
 996         }
 997
 998         /* Initialise samba/rpc client stuff */
 999
1000         pc = poptGetContext("winbindd", argc, (const char **)argv, long_options, 0);
1001
1002         while ((opt = poptGetNextOpt(pc)) != -1) {
1003                 switch (opt) {
1004                         /* Don't become a daemon */
1005                 case OPT_DAEMON:
1006                         is_daemon = True;
1007                         break;
1008                 case 'i':
1009                         interactive = True;
1010                         log_stdout = True;
1011                         Fork = False;
1012                         break;
1013                 case OPT_FORK:
1014                         Fork = false;
1015                         break;
1016                 case OPT_NO_PROCESS_GROUP:
1017                         no_process_group = true;
1018                         break;
1019                 case OPT_LOG_STDOUT:
1020                         log_stdout = true;
1021                         break;
1022                 case 'n':
1023                         opt_nocache = true;
1024                         break;
1025                 default:
1026                         d_fprintf(stderr, "\nInvalid option %s: %s\n\n",
1027                                   poptBadOption(pc, 0), poptStrerror(opt));
1028                         poptPrintUsage(pc, stderr, 0);
1029                         exit(1);
1030                 }
1031         }
1032
1033         if (is_daemon && interactive) {
1034                 d_fprintf(stderr,"\nERROR: "
1035                           "Option -i|--interactive is not allowed together with -D|--daemon\n\n");
1036                 poptPrintUsage(pc, stderr, 0);
1037                 exit(1);
1038         }
1039
1040         if (log_stdout && Fork) {
1041                 d_fprintf(stderr, "\nERROR: "
1042                           "Can't log to stdout (-S) unless daemon is in foreground +(-F) or interactive (-i)\n\n");
1043                 poptPrintUsage(pc, stderr, 0);
1044                 exit(1);
1045         }
1046
1047         poptFreeContext(pc);
1048
1049         if (!override_logfile) {
1050                 char *lfile = NULL;
1051                 if (asprintf(&lfile,"%s/log.winbindd",
1052                                 get_dyn_LOGFILEBASE()) > 0) {
1053                         lp_set_logfile(lfile);
1054                         SAFE_FREE(lfile);
1055                 }
1056         }
1057         setup_logging("winbindd", log_stdout);
1058         reopen_logs();
1059
1060         DEBUG(0,("winbindd version %s started.\n", samba_version_string()));
1061         DEBUGADD(0,("%s\n", COPYRIGHT_STARTUP_MESSAGE));
1062
1063         if (!lp_load_initial_only(get_dyn_CONFIGFILE())) {
1064                 DEBUG(0, ("error opening config file\n"));
1065                 exit(1);
1066         }
1067
1068         /* Initialise messaging system */
1069
1070         if (winbind_messaging_context() == NULL) {
1071                 exit(1);
1072         }
1073
1074         if (!reload_services_file(NULL)) {
1075                 DEBUG(0, ("error opening config file\n"));
1076                 exit(1);
1077         }
1078
1079         if (!directory_exist(lp_lockdir())) {
1080                 mkdir(lp_lockdir(), 0755);
1081         }
1082
1083         /* Setup names. */
1084
1085         if (!init_names())
1086                 exit(1);
1087
1088         load_interfaces();
1089
1090         if (!secrets_init()) {
1091
1092                 DEBUG(0,("Could not initialize domain trust account secrets. Giving up\n"));
1093                 return False;
1094         }
1095
1096         /* Enable netbios namecache */
1097
1098         namecache_enable();
1099
1100         /* Unblock all signals we are interested in as they may have been
1101            blocked by the parent process. */
1102
1103         BlockSignals(False, SIGINT);
1104         BlockSignals(False, SIGQUIT);
1105         BlockSignals(False, SIGTERM);
1106         BlockSignals(False, SIGUSR1);
1107         BlockSignals(False, SIGUSR2);
1108         BlockSignals(False, SIGHUP);
1109         BlockSignals(False, SIGCHLD);
1110
1111         if (!interactive)
1112                 become_daemon(Fork, no_process_group);
1113
1114         pidfile_create("winbindd");
1115
1116 #if HAVE_SETPGID
1117         /*
1118          * If we're interactive we want to set our own process group for
1119          * signal management.
1120          */
1121         if (interactive && !no_process_group)
1122                 setpgid( (pid_t)0, (pid_t)0);
1123 #endif
1124
1125         TimeInit();
1126
1127         /* Don't use winbindd_reinit_after_fork here as
1128          * we're just starting up and haven't created any
1129          * winbindd-specific resources we must free yet. JRA.
1130          */
1131
1132         if (!NT_STATUS_IS_OK(reinit_after_fork(winbind_messaging_context(),
1133                                                winbind_event_context(),
1134                                                false))) {
1135                 DEBUG(0,("reinit_after_fork() failed\n"));
1136                 exit(1);
1137         }
1138
1139         /* Setup signal handlers */
1140
1141         if (!winbindd_setup_sig_term_handler(true))
1142                 exit(1);
1143         if (!winbindd_setup_sig_hup_handler(NULL))
1144                 exit(1);
1145         if (!winbindd_setup_sig_chld_handler())
1146                 exit(1);
1147         if (!winbindd_setup_sig_usr2_handler())
1148                 exit(1);
1149
1150         CatchSignal(SIGPIPE, SIG_IGN);                 /* Ignore sigpipe */
1151
1152         /*
1153          * Ensure all cache and idmap caches are consistent
1154          * and initialized before we startup.
1155          */
1156         if (!winbindd_cache_validate_and_initialize()) {
1157                 exit(1);
1158         }
1159
1160         /* get broadcast messages */
1161         claim_connection(NULL,"",FLAG_MSG_GENERAL|FLAG_MSG_DBWRAP);
1162
1163         /* React on 'smbcontrol winbindd reload-config' in the same way
1164            as to SIGHUP signal */
1165         messaging_register(winbind_messaging_context(), NULL,
1166                            MSG_SMB_CONF_UPDATED, msg_reload_services);
1167         messaging_register(winbind_messaging_context(), NULL,
1168                            MSG_SHUTDOWN, msg_shutdown);
1169
1170         /* Handle online/offline messages. */
1171         messaging_register(winbind_messaging_context(), NULL,
1172                            MSG_WINBIND_OFFLINE, winbind_msg_offline);
1173         messaging_register(winbind_messaging_context(), NULL,
1174                            MSG_WINBIND_ONLINE, winbind_msg_online);
1175         messaging_register(winbind_messaging_context(), NULL,
1176                            MSG_WINBIND_ONLINESTATUS, winbind_msg_onlinestatus);
1177
1178         messaging_register(winbind_messaging_context(), NULL,
1179                            MSG_DUMP_EVENT_LIST, winbind_msg_dump_event_list);
1180
1181         messaging_register(winbind_messaging_context(), NULL,
1182                            MSG_WINBIND_VALIDATE_CACHE,
1183                            winbind_msg_validate_cache);
1184
1185         messaging_register(winbind_messaging_context(), NULL,
1186                            MSG_WINBIND_DUMP_DOMAIN_LIST,
1187                            winbind_msg_dump_domain_list);
1188
1189         /* Register handler for MSG_DEBUG. */
1190         messaging_register(winbind_messaging_context(), NULL,
1191                            MSG_DEBUG,
1192                            winbind_msg_debug);
1193
1194         netsamlogon_cache_init(); /* Non-critical */
1195
1196         /* clear the cached list of trusted domains */
1197
1198         wcache_tdc_clear();
1199
1200         if (!init_domain_list()) {
1201                 DEBUG(0,("unable to initialize domain list\n"));
1202                 exit(1);
1203         }
1204
1205         init_idmap_child();
1206         init_locator_child();
1207
1208         smb_nscd_flush_user_cache();
1209         smb_nscd_flush_group_cache();
1210
1211         /* setup listen sockets */
1212
1213         if (!winbindd_setup_listeners()) {
1214                 DEBUG(0,("winbindd_setup_listeners() failed\n"));
1215                 exit(1);
1216         }
1217
1218         te = tevent_add_timer(winbind_event_context(), NULL, timeval_zero(),
1219                               rescan_trusted_domains, NULL);
1220         if (te == NULL) {
1221                 DEBUG(0, ("Could not trigger rescan_trusted_domains()\n"));
1222                 exit(1);
1223         }
1224
1225         TALLOC_FREE(frame);
1226         /* Loop waiting for requests */
1227         while (1) {
1228                 frame = talloc_stackframe();
1229
1230                 if (tevent_loop_once(winbind_event_context()) == -1) {
1231                         DEBUG(1, ("tevent_loop_once() failed: %s\n",
1232                                   strerror(errno)));
1233                         return 1;
1234                 }
1235
1236                 TALLOC_FREE(frame);
1237         }
1238
1239         return 0;
1240 }