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