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