source3/winbindd/winbindd.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3
   4    Winbind daemon for ntdom nss module
   5
   6    Copyright (C) by Tim Potter 2000-2002
   7    Copyright (C) Andrew Tridgell 2002
   8    Copyright (C) Jelmer Vernooij 2003
   9    Copyright (C) Volker Lendecke 2004
  10
  11    This program is free software; you can redistribute it and/or modify
  12    it under the terms of the GNU General Public License as published by
  13    the Free Software Foundation; either version 3 of the License, or
  14    (at your option) any later version.
  15
  16    This program is distributed in the hope that it will be useful,
  17    but WITHOUT ANY WARRANTY; without even the implied warranty of
  18    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19    GNU General Public License for more details.
  20
  21    You should have received a copy of the GNU General Public License
  22    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  23 */
  24
  25 #include "includes.h"
  26 #include "popt_common.h"
  27 #include "winbindd.h"
  28 #include "nsswitch/winbind_client.h"
  29 #include "../../nsswitch/libwbclient/wbc_async.h"
  30 #include "librpc/gen_ndr/messaging.h"
  31 #include "../librpc/gen_ndr/srv_lsa.h"
  32 #include "../librpc/gen_ndr/srv_samr.h"
  33 #include "secrets.h"
  34 #include "idmap.h"
  35
  36 #undef DBGC_CLASS
  37 #define DBGC_CLASS DBGC_WINBIND
  38
  39 static bool client_is_idle(struct winbindd_cli_state *state);
  40 static void remove_client(struct winbindd_cli_state *state);
  41
  42 static bool opt_nocache = False;
  43 static bool interactive = False;
  44
  45 extern bool override_logfile;
  46
  47 /* Reload configuration */
  48
  49 static bool reload_services_file(const char *lfile)
  50 {
  51         bool ret;
  52
  53         if (lp_loaded()) {
  54                 const char *fname = lp_configfile();
  55
  56                 if (file_exist(fname) && !strcsequal(fname,get_dyn_CONFIGFILE())) {
  57                         set_dyn_CONFIGFILE(fname);
  58                 }
  59         }
  60
  61         /* if this is a child, restore the logfile to the special
  62            name - <domain>, idmap, etc. */
  63         if (lfile && *lfile) {
  64                 lp_set_logfile(lfile);
  65         }
  66
  67         reopen_logs();
  68         ret = lp_load(get_dyn_CONFIGFILE(),False,False,True,True);
  69
  70         reopen_logs();
  71         load_interfaces();
  72
  73         return(ret);
  74 }
  75
  76
  77 /**************************************************************************** **
  78  Handle a fault..
  79  **************************************************************************** */
  80
  81 static void fault_quit(void)
  82 {
  83         dump_core();
  84 }
  85
  86 static void winbindd_status(void)
  87 {
  88         struct winbindd_cli_state *tmp;
  89
  90         DEBUG(0, ("winbindd status:\n"));
  91
  92         /* Print client state information */
  93
  94         DEBUG(0, ("\t%d clients currently active\n", winbindd_num_clients()));
  95
  96         if (DEBUGLEVEL >= 2 && winbindd_num_clients()) {
  97                 DEBUG(2, ("\tclient list:\n"));
  98                 for(tmp = winbindd_client_list(); tmp; tmp = tmp->next) {
  99                         DEBUGADD(2, ("\t\tpid %lu, sock %d (%s)\n",
 100                                      (unsigned long)tmp->pid, tmp->sock,
 101                                      client_is_idle(tmp) ? "idle" : "active"));
 102                 }
 103         }
 104 }
 105
 106 /* Flush client cache */
 107
 108 static void flush_caches(void)
 109 {
 110         /* We need to invalidate cached user list entries on a SIGHUP
 111            otherwise cached access denied errors due to restrict anonymous
 112            hang around until the sequence number changes. */
 113
 114         if (!wcache_invalidate_cache()) {
 115                 DEBUG(0, ("invalidating the cache failed; revalidate the cache\n"));
 116                 if (!winbindd_cache_validate_and_initialize()) {
 117                         exit(1);
 118                 }
 119         }
 120 }
 121
 122 static void flush_caches_noinit(void)
 123 {
 124         /*
 125          * We need to invalidate cached user list entries on a SIGHUP
 126          * otherwise cached access denied errors due to restrict anonymous
 127          * hang around until the sequence number changes.
 128          * NB
 129          * Skip uninitialized domains when flush cache.
 130          * If domain is not initialized, it means it is never
 131          * used or never become online. look, wcache_invalidate_cache()
 132          * -> get_cache() -> init_dc_connection(). It causes a lot of traffic
 133          * for unused domains and large traffic for primay domain's DC if there
 134          * are many domains..
 135          */
 136
 137         if (!wcache_invalidate_cache_noinit()) {
 138                 DEBUG(0, ("invalidating the cache failed; revalidate the cache\n"));
 139                 if (!winbindd_cache_validate_and_initialize()) {
 140                         exit(1);
 141                 }
 142         }
 143 }
 144
 145 /* Handle the signal by unlinking socket and exiting */
 146
 147 static void terminate(bool is_parent)
 148 {
 149         if (is_parent) {
 150                 /* When parent goes away we should
 151                  * remove the socket file. Not so
 152                  * when children terminate.
 153                  */
 154                 char *path = NULL;
 155
 156                 if (asprintf(&path, "%s/%s",
 157                         get_winbind_pipe_dir(), WINBINDD_SOCKET_NAME) > 0) {
 158                         unlink(path);
 159                         SAFE_FREE(path);
 160                 }
 161         }
 162
 163         idmap_close();
 164
 165         trustdom_cache_shutdown();
 166
 167         gencache_stabilize();
 168
 169 #if 0
 170         if (interactive) {
 171                 TALLOC_CTX *mem_ctx = talloc_init("end_description");
 172                 char *description = talloc_describe_all(mem_ctx);
 173
 174                 DEBUG(3, ("tallocs left:\n%s\n", description));
 175                 talloc_destroy(mem_ctx);
 176         }
 177 #endif
 178
 179         if (is_parent) {
 180                 serverid_deregister(procid_self());
 181                 pidfile_unlink();
 182         }
 183
 184         exit(0);
 185 }
 186
 187 static void winbindd_sig_term_handler(struct tevent_context *ev,
 188                                       struct tevent_signal *se,
 189                                       int signum,
 190                                       int count,
 191                                       void *siginfo,
 192                                       void *private_data)
 193 {
 194         bool *is_parent = talloc_get_type_abort(private_data, bool);
 195
 196         DEBUG(0,("Got sig[%d] terminate (is_parent=%d)\n",
 197                  signum, (int)*is_parent));
 198         terminate(*is_parent);
 199 }
 200
 201 bool winbindd_setup_sig_term_handler(bool parent)
 202 {
 203         struct tevent_signal *se;
 204         bool *is_parent;
 205
 206         is_parent = talloc(winbind_event_context(), bool);
 207         if (!is_parent) {
 208                 return false;
 209         }
 210
 211         *is_parent = parent;
 212
 213         se = tevent_add_signal(winbind_event_context(),
 214                                is_parent,
 215                                SIGTERM, 0,
 216                                winbindd_sig_term_handler,
 217                                is_parent);
 218         if (!se) {
 219                 DEBUG(0,("failed to setup SIGTERM handler"));
 220                 talloc_free(is_parent);
 221                 return false;
 222         }
 223
 224         se = tevent_add_signal(winbind_event_context(),
 225                                is_parent,
 226                                SIGINT, 0,
 227                                winbindd_sig_term_handler,
 228                                is_parent);
 229         if (!se) {
 230                 DEBUG(0,("failed to setup SIGINT handler"));
 231                 talloc_free(is_parent);
 232                 return false;
 233         }
 234
 235         se = tevent_add_signal(winbind_event_context(),
 236                                is_parent,
 237                                SIGQUIT, 0,
 238                                winbindd_sig_term_handler,
 239                                is_parent);
 240         if (!se) {
 241                 DEBUG(0,("failed to setup SIGINT handler"));
 242                 talloc_free(is_parent);
 243                 return false;
 244         }
 245
 246         return true;
 247 }
 248
 249 static void winbindd_sig_hup_handler(struct tevent_context *ev,
 250                                      struct tevent_signal *se,
 251                                      int signum,
 252                                      int count,
 253                                      void *siginfo,
 254                                      void *private_data)
 255 {
 256         const char *file = (const char *)private_data;
 257
 258         DEBUG(1,("Reloading services after SIGHUP\n"));
 259         flush_caches_noinit();
 260         reload_services_file(file);
 261 }
 262
 263 bool winbindd_setup_sig_hup_handler(const char *lfile)
 264 {
 265         struct tevent_signal *se;
 266         char *file = NULL;
 267
 268         if (lfile) {
 269                 file = talloc_strdup(winbind_event_context(),
 270                                      lfile);
 271                 if (!file) {
 272                         return false;
 273                 }
 274         }
 275
 276         se = tevent_add_signal(winbind_event_context(),
 277                                winbind_event_context(),
 278                                SIGHUP, 0,
 279                                winbindd_sig_hup_handler,
 280                                file);
 281         if (!se) {
 282                 return false;
 283         }
 284
 285         return true;
 286 }
 287
 288 static void winbindd_sig_chld_handler(struct tevent_context *ev,
 289                                       struct tevent_signal *se,
 290                                       int signum,
 291                                       int count,
 292                                       void *siginfo,
 293                                       void *private_data)
 294 {
 295         pid_t pid;
 296
 297         while ((pid = sys_waitpid(-1, NULL, WNOHANG)) > 0) {
 298                 winbind_child_died(pid);
 299         }
 300 }
 301
 302 static bool winbindd_setup_sig_chld_handler(void)
 303 {
 304         struct tevent_signal *se;
 305
 306         se = tevent_add_signal(winbind_event_context(),
 307                                winbind_event_context(),
 308                                SIGCHLD, 0,
 309                                winbindd_sig_chld_handler,
 310                                NULL);
 311         if (!se) {
 312                 return false;
 313         }
 314
 315         return true;
 316 }
 317
 318 static void winbindd_sig_usr2_handler(struct tevent_context *ev,
 319                                       struct tevent_signal *se,
 320                                       int signum,
 321                                       int count,
 322                                       void *siginfo,
 323                                       void *private_data)
 324 {
 325         winbindd_status();
 326 }
 327
 328 static bool winbindd_setup_sig_usr2_handler(void)
 329 {
 330         struct tevent_signal *se;
 331
 332         se = tevent_add_signal(winbind_event_context(),
 333                                winbind_event_context(),
 334                                SIGUSR2, 0,
 335                                winbindd_sig_usr2_handler,
 336                                NULL);
 337         if (!se) {
 338                 return false;
 339         }
 340
 341         return true;
 342 }
 343
 344 /* React on 'smbcontrol winbindd reload-config' in the same way as on SIGHUP*/
 345 static void msg_reload_services(struct messaging_context *msg,
 346                                 void *private_data,
 347                                 uint32_t msg_type,
 348                                 struct server_id server_id,
 349                                 DATA_BLOB *data)
 350 {
 351         /* Flush various caches */
 352         flush_caches();
 353         reload_services_file((const char *) private_data);
 354 }
 355
 356 /* React on 'smbcontrol winbindd shutdown' in the same way as on SIGTERM*/
 357 static void msg_shutdown(struct messaging_context *msg,
 358                          void *private_data,
 359                          uint32_t msg_type,
 360                          struct server_id server_id,
 361                          DATA_BLOB *data)
 362 {
 363         /* only the parent waits for this message */
 364         DEBUG(0,("Got shutdown message\n"));
 365         terminate(true);
 366 }
 367
 368
 369 static void winbind_msg_validate_cache(struct messaging_context *msg_ctx,
 370                                        void *private_data,
 371                                        uint32_t msg_type,
 372                                        struct server_id server_id,
 373                                        DATA_BLOB *data)
 374 {
 375         uint8 ret;
 376         pid_t child_pid;
 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         child_pid = sys_fork();
 387
 388         if (child_pid == -1) {
 389                 DEBUG(1, ("winbind_msg_validate_cache: Could not fork: %s\n",
 390                           strerror(errno)));
 391                 return;
 392         }
 393
 394         if (child_pid != 0) {
 395                 /* parent */
 396                 DEBUG(5, ("winbind_msg_validate_cache: child created with "
 397                           "pid %d.\n", (int)child_pid));
 398                 return;
 399         }
 400
 401         /* child */
 402
 403         if (!winbindd_reinit_after_fork(NULL)) {
 404                 _exit(0);
 405         }
 406
 407         /* install default SIGCHLD handler: validation code uses fork/waitpid */
 408         CatchSignal(SIGCHLD, SIG_DFL);
 409
 410         ret = (uint8)winbindd_validate_cache_nobackup();
 411         DEBUG(10, ("winbindd_msg_validata_cache: got return value %d\n", ret));
 412         messaging_send_buf(msg_ctx, server_id, MSG_WINBIND_VALIDATE_CACHE, &ret,
 413                            (size_t)1);
 414         _exit(0);
 415 }
 416
 417 static struct winbindd_dispatch_table {
 418         enum winbindd_cmd cmd;
 419         void (*fn)(struct winbindd_cli_state *state);
 420         const char *winbindd_cmd_name;
 421 } dispatch_table[] = {
 422
 423         /* Enumeration functions */
 424
 425         { WINBINDD_LIST_TRUSTDOM, winbindd_list_trusted_domains,
 426           "LIST_TRUSTDOM" },
 427
 428         /* Miscellaneous */
 429
 430         { WINBINDD_INFO, winbindd_info, "INFO" },
 431         { WINBINDD_INTERFACE_VERSION, winbindd_interface_version,
 432           "INTERFACE_VERSION" },
 433         { WINBINDD_DOMAIN_NAME, winbindd_domain_name, "DOMAIN_NAME" },
 434         { WINBINDD_DOMAIN_INFO, winbindd_domain_info, "DOMAIN_INFO" },
 435         { WINBINDD_NETBIOS_NAME, winbindd_netbios_name, "NETBIOS_NAME" },
 436         { WINBINDD_PRIV_PIPE_DIR, winbindd_priv_pipe_dir,
 437           "WINBINDD_PRIV_PIPE_DIR" },
 438
 439         /* Credential cache access */
 440         { WINBINDD_CCACHE_NTLMAUTH, winbindd_ccache_ntlm_auth, "NTLMAUTH" },
 441         { WINBINDD_CCACHE_SAVE, winbindd_ccache_save, "CCACHE_SAVE" },
 442
 443         /* WINS functions */
 444
 445         { WINBINDD_WINS_BYNAME, winbindd_wins_byname, "WINS_BYNAME" },
 446         { WINBINDD_WINS_BYIP, winbindd_wins_byip, "WINS_BYIP" },
 447
 448         /* End of list */
 449
 450         { WINBINDD_NUM_CMDS, NULL, "NONE" }
 451 };
 452
 453 struct winbindd_async_dispatch_table {
 454         enum winbindd_cmd cmd;
 455         const char *cmd_name;
 456         struct tevent_req *(*send_req)(TALLOC_CTX *mem_ctx,
 457                                        struct tevent_context *ev,
 458                                        struct winbindd_cli_state *cli,
 459                                        struct winbindd_request *request);
 460         NTSTATUS (*recv_req)(struct tevent_req *req,
 461                              struct winbindd_response *presp);
 462 };
 463
 464 static struct winbindd_async_dispatch_table async_nonpriv_table[] = {
 465         { WINBINDD_PING, "PING",
 466           wb_ping_send, wb_ping_recv },
 467         { WINBINDD_LOOKUPSID, "LOOKUPSID",
 468           winbindd_lookupsid_send, winbindd_lookupsid_recv },
 469         { WINBINDD_LOOKUPNAME, "LOOKUPNAME",
 470           winbindd_lookupname_send, winbindd_lookupname_recv },
 471         { WINBINDD_SID_TO_UID, "SID_TO_UID",
 472           winbindd_sid_to_uid_send, winbindd_sid_to_uid_recv },
 473         { WINBINDD_SID_TO_GID, "SID_TO_GID",
 474           winbindd_sid_to_gid_send, winbindd_sid_to_gid_recv },
 475         { WINBINDD_UID_TO_SID, "UID_TO_SID",
 476           winbindd_uid_to_sid_send, winbindd_uid_to_sid_recv },
 477         { WINBINDD_GID_TO_SID, "GID_TO_SID",
 478           winbindd_gid_to_sid_send, winbindd_gid_to_sid_recv },
 479         { WINBINDD_GETPWSID, "GETPWSID",
 480           winbindd_getpwsid_send, winbindd_getpwsid_recv },
 481         { WINBINDD_GETPWNAM, "GETPWNAM",
 482           winbindd_getpwnam_send, winbindd_getpwnam_recv },
 483         { WINBINDD_GETPWUID, "GETPWUID",
 484           winbindd_getpwuid_send, winbindd_getpwuid_recv },
 485         { WINBINDD_GETSIDALIASES, "GETSIDALIASES",
 486           winbindd_getsidaliases_send, winbindd_getsidaliases_recv },
 487         { WINBINDD_GETUSERDOMGROUPS, "GETUSERDOMGROUPS",
 488           winbindd_getuserdomgroups_send, winbindd_getuserdomgroups_recv },
 489         { WINBINDD_GETGROUPS, "GETGROUPS",
 490           winbindd_getgroups_send, winbindd_getgroups_recv },
 491         { WINBINDD_SHOW_SEQUENCE, "SHOW_SEQUENCE",
 492           winbindd_show_sequence_send, winbindd_show_sequence_recv },
 493         { WINBINDD_GETGRGID, "GETGRGID",
 494           winbindd_getgrgid_send, winbindd_getgrgid_recv },
 495         { WINBINDD_GETGRNAM, "GETGRNAM",
 496           winbindd_getgrnam_send, winbindd_getgrnam_recv },
 497         { WINBINDD_GETUSERSIDS, "GETUSERSIDS",
 498           winbindd_getusersids_send, winbindd_getusersids_recv },
 499         { WINBINDD_LOOKUPRIDS, "LOOKUPRIDS",
 500           winbindd_lookuprids_send, winbindd_lookuprids_recv },
 501         { WINBINDD_SETPWENT, "SETPWENT",
 502           winbindd_setpwent_send, winbindd_setpwent_recv },
 503         { WINBINDD_GETPWENT, "GETPWENT",
 504           winbindd_getpwent_send, winbindd_getpwent_recv },
 505         { WINBINDD_ENDPWENT, "ENDPWENT",
 506           winbindd_endpwent_send, winbindd_endpwent_recv },
 507         { WINBINDD_DSGETDCNAME, "DSGETDCNAME",
 508           winbindd_dsgetdcname_send, winbindd_dsgetdcname_recv },
 509         { WINBINDD_GETDCNAME, "GETDCNAME",
 510           winbindd_getdcname_send, winbindd_getdcname_recv },
 511         { WINBINDD_SETGRENT, "SETGRENT",
 512           winbindd_setgrent_send, winbindd_setgrent_recv },
 513         { WINBINDD_GETGRENT, "GETGRENT",
 514           winbindd_getgrent_send, winbindd_getgrent_recv },
 515         { WINBINDD_ENDGRENT, "ENDGRENT",
 516           winbindd_endgrent_send, winbindd_endgrent_recv },
 517         { WINBINDD_LIST_USERS, "LIST_USERS",
 518           winbindd_list_users_send, winbindd_list_users_recv },
 519         { WINBINDD_LIST_GROUPS, "LIST_GROUPS",
 520           winbindd_list_groups_send, winbindd_list_groups_recv },
 521         { WINBINDD_CHECK_MACHACC, "CHECK_MACHACC",
 522           winbindd_check_machine_acct_send, winbindd_check_machine_acct_recv },
 523         { WINBINDD_PING_DC, "PING_DC",
 524           winbindd_ping_dc_send, winbindd_ping_dc_recv },
 525         { WINBINDD_PAM_AUTH, "PAM_AUTH",
 526           winbindd_pam_auth_send, winbindd_pam_auth_recv },
 527         { WINBINDD_PAM_LOGOFF, "PAM_LOGOFF",
 528           winbindd_pam_logoff_send, winbindd_pam_logoff_recv },
 529         { WINBINDD_PAM_CHAUTHTOK, "PAM_CHAUTHTOK",
 530           winbindd_pam_chauthtok_send, winbindd_pam_chauthtok_recv },
 531         { WINBINDD_PAM_CHNG_PSWD_AUTH_CRAP, "PAM_CHNG_PSWD_AUTH_CRAP",
 532           winbindd_pam_chng_pswd_auth_crap_send,
 533           winbindd_pam_chng_pswd_auth_crap_recv },
 534
 535         { 0, NULL, NULL, NULL }
 536 };
 537
 538 static struct winbindd_async_dispatch_table async_priv_table[] = {
 539         { WINBINDD_ALLOCATE_UID, "ALLOCATE_UID",
 540           winbindd_allocate_uid_send, winbindd_allocate_uid_recv },
 541         { WINBINDD_ALLOCATE_GID, "ALLOCATE_GID",
 542           winbindd_allocate_gid_send, winbindd_allocate_gid_recv },
 543         { WINBINDD_CHANGE_MACHACC, "CHANGE_MACHACC",
 544           winbindd_change_machine_acct_send, winbindd_change_machine_acct_recv },
 545         { WINBINDD_PAM_AUTH_CRAP, "PAM_AUTH_CRAP",
 546           winbindd_pam_auth_crap_send, winbindd_pam_auth_crap_recv },
 547
 548         { 0, NULL, NULL, NULL }
 549 };
 550
 551 static void wb_request_done(struct tevent_req *req);
 552
 553 static void process_request(struct winbindd_cli_state *state)
 554 {
 555         struct winbindd_dispatch_table *table = dispatch_table;
 556         struct winbindd_async_dispatch_table *atable;
 557
 558         state->mem_ctx = talloc_named(state, 0, "winbind request");
 559         if (state->mem_ctx == NULL)
 560                 return;
 561
 562         /* Remember who asked us. */
 563         state->pid = state->request->pid;
 564
 565         state->cmd_name = "unknown request";
 566         state->recv_fn = NULL;
 567
 568         /* Process command */
 569
 570         for (atable = async_nonpriv_table; atable->send_req; atable += 1) {
 571                 if (state->request->cmd == atable->cmd) {
 572                         break;
 573                 }
 574         }
 575
 576         if ((atable->send_req == NULL) && state->privileged) {
 577                 for (atable = async_priv_table; atable->send_req;
 578                      atable += 1) {
 579                         if (state->request->cmd == atable->cmd) {
 580                                 break;
 581                         }
 582                 }
 583         }
 584
 585         if (atable->send_req != NULL) {
 586                 struct tevent_req *req;
 587
 588                 state->cmd_name = atable->cmd_name;
 589                 state->recv_fn = atable->recv_req;
 590
 591                 DEBUG(10, ("process_request: Handling async request %d:%s\n",
 592                            (int)state->pid, state->cmd_name));
 593
 594                 req = atable->send_req(state->mem_ctx, winbind_event_context(),
 595                                        state, state->request);
 596                 if (req == NULL) {
 597                         DEBUG(0, ("process_request: atable->send failed for "
 598                                   "%s\n", atable->cmd_name));
 599                         request_error(state);
 600                         return;
 601                 }
 602                 tevent_req_set_callback(req, wb_request_done, state);
 603                 return;
 604         }
 605
 606         state->response = talloc_zero(state->mem_ctx,
 607                                       struct winbindd_response);
 608         if (state->response == NULL) {
 609                 DEBUG(10, ("talloc failed\n"));
 610                 remove_client(state);
 611                 return;
 612         }
 613         state->response->result = WINBINDD_PENDING;
 614         state->response->length = sizeof(struct winbindd_response);
 615
 616         for (table = dispatch_table; table->fn; table++) {
 617                 if (state->request->cmd == table->cmd) {
 618                         DEBUG(10,("process_request: request fn %s\n",
 619                                   table->winbindd_cmd_name ));
 620                         state->cmd_name = table->winbindd_cmd_name;
 621                         table->fn(state);
 622                         break;
 623                 }
 624         }
 625
 626         if (!table->fn) {
 627                 DEBUG(10,("process_request: unknown request fn number %d\n",
 628                           (int)state->request->cmd ));
 629                 request_error(state);
 630         }
 631 }
 632
 633 static void wb_request_done(struct tevent_req *req)
 634 {
 635         struct winbindd_cli_state *state = tevent_req_callback_data(
 636                 req, struct winbindd_cli_state);
 637         NTSTATUS status;
 638
 639         state->response = talloc_zero(state->mem_ctx,
 640                                       struct winbindd_response);
 641         if (state->response == NULL) {
 642                 DEBUG(0, ("wb_request_done[%d:%s]: talloc_zero failed - removing client\n",
 643                           (int)state->pid, state->cmd_name));
 644                 remove_client(state);
 645                 return;
 646         }
 647         state->response->result = WINBINDD_PENDING;
 648         state->response->length = sizeof(struct winbindd_response);
 649
 650         status = state->recv_fn(req, state->response);
 651         TALLOC_FREE(req);
 652
 653         DEBUG(10,("wb_request_done[%d:%s]: %s\n",
 654                   (int)state->pid, state->cmd_name, nt_errstr(status)));
 655
 656         if (!NT_STATUS_IS_OK(status)) {
 657                 request_error(state);
 658                 return;
 659         }
 660         request_ok(state);
 661 }
 662
 663 /*
 664  * This is the main event loop of winbind requests. It goes through a
 665  * state-machine of 3 read/write requests, 4 if you have extra data to send.
 666  *
 667  * An idle winbind client has a read request of 4 bytes outstanding,
 668  * finalizing function is request_len_recv, checking the length. request_recv
 669  * then processes the packet. The processing function then at some point has
 670  * to call request_finished which schedules sending the response.
 671  */
 672
 673 static void request_finished(struct winbindd_cli_state *state);
 674
 675 static void winbind_client_request_read(struct tevent_req *req);
 676 static void winbind_client_response_written(struct tevent_req *req);
 677
 678 static void request_finished(struct winbindd_cli_state *state)
 679 {
 680         struct tevent_req *req;
 681
 682         TALLOC_FREE(state->request);
 683
 684         req = wb_resp_write_send(state, winbind_event_context(),
 685                                  state->out_queue, state->sock,
 686                                  state->response);
 687         if (req == NULL) {
 688                 DEBUG(10,("request_finished[%d:%s]: wb_resp_write_send() failed\n",
 689                           (int)state->pid, state->cmd_name));
 690                 remove_client(state);
 691                 return;
 692         }
 693         tevent_req_set_callback(req, winbind_client_response_written, state);
 694 }
 695
 696 static void winbind_client_response_written(struct tevent_req *req)
 697 {
 698         struct winbindd_cli_state *state = tevent_req_callback_data(
 699                 req, struct winbindd_cli_state);
 700         ssize_t ret;
 701         int err;
 702
 703         ret = wb_resp_write_recv(req, &err);
 704         TALLOC_FREE(req);
 705         if (ret == -1) {
 706                 close(state->sock);
 707                 state->sock = -1;
 708                 DEBUG(2, ("Could not write response[%d:%s] to client: %s\n",
 709                           (int)state->pid, state->cmd_name, strerror(err)));
 710                 remove_client(state);
 711                 return;
 712         }
 713
 714         DEBUG(10,("winbind_client_response_written[%d:%s]: delivered response "
 715                   "to client\n", (int)state->pid, state->cmd_name));
 716
 717         TALLOC_FREE(state->mem_ctx);
 718         state->response = NULL;
 719         state->cmd_name = "no request";
 720         state->recv_fn = NULL;
 721
 722         req = wb_req_read_send(state, winbind_event_context(), state->sock,
 723                                WINBINDD_MAX_EXTRA_DATA);
 724         if (req == NULL) {
 725                 remove_client(state);
 726                 return;
 727         }
 728         tevent_req_set_callback(req, winbind_client_request_read, state);
 729 }
 730
 731 void request_error(struct winbindd_cli_state *state)
 732 {
 733         SMB_ASSERT(state->response->result == WINBINDD_PENDING);
 734         state->response->result = WINBINDD_ERROR;
 735         request_finished(state);
 736 }
 737
 738 void request_ok(struct winbindd_cli_state *state)
 739 {
 740         SMB_ASSERT(state->response->result == WINBINDD_PENDING);
 741         state->response->result = WINBINDD_OK;
 742         request_finished(state);
 743 }
 744
 745 /* Process a new connection by adding it to the client connection list */
 746
 747 static void new_connection(int listen_sock, bool privileged)
 748 {
 749         struct sockaddr_un sunaddr;
 750         struct winbindd_cli_state *state;
 751         struct tevent_req *req;
 752         socklen_t len;
 753         int sock;
 754
 755         /* Accept connection */
 756
 757         len = sizeof(sunaddr);
 758
 759         do {
 760                 sock = accept(listen_sock, (struct sockaddr *)(void *)&sunaddr,
 761                               &len);
 762         } while (sock == -1 && errno == EINTR);
 763
 764         if (sock == -1)
 765                 return;
 766
 767         DEBUG(6,("accepted socket %d\n", sock));
 768
 769         /* Create new connection structure */
 770
 771         if ((state = TALLOC_ZERO_P(NULL, struct winbindd_cli_state)) == NULL) {
 772                 close(sock);
 773                 return;
 774         }
 775
 776         state->sock = sock;
 777
 778         state->out_queue = tevent_queue_create(state, "winbind client reply");
 779         if (state->out_queue == NULL) {
 780                 close(sock);
 781                 TALLOC_FREE(state);
 782                 return;
 783         }
 784
 785         state->last_access = time(NULL);
 786
 787         state->privileged = privileged;
 788
 789         req = wb_req_read_send(state, winbind_event_context(), state->sock,
 790                                WINBINDD_MAX_EXTRA_DATA);
 791         if (req == NULL) {
 792                 TALLOC_FREE(state);
 793                 close(sock);
 794                 return;
 795         }
 796         tevent_req_set_callback(req, winbind_client_request_read, state);
 797
 798         /* Add to connection list */
 799
 800         winbindd_add_client(state);
 801 }
 802
 803 static void winbind_client_request_read(struct tevent_req *req)
 804 {
 805         struct winbindd_cli_state *state = tevent_req_callback_data(
 806                 req, struct winbindd_cli_state);
 807         ssize_t ret;
 808         int err;
 809
 810         ret = wb_req_read_recv(req, state, &state->request, &err);
 811         TALLOC_FREE(req);
 812         if (ret == -1) {
 813                 if (err == EPIPE) {
 814                         DEBUG(6, ("closing socket %d, client exited\n",
 815                                   state->sock));
 816                 } else {
 817                         DEBUG(2, ("Could not read client request from fd %d: "
 818                                   "%s\n", state->sock, strerror(err)));
 819                 }
 820                 close(state->sock);
 821                 state->sock = -1;
 822                 remove_client(state);
 823                 return;
 824         }
 825         process_request(state);
 826 }
 827
 828 /* Remove a client connection from client connection list */
 829
 830 static void remove_client(struct winbindd_cli_state *state)
 831 {
 832         char c = 0;
 833         int nwritten;
 834
 835         /* It's a dead client - hold a funeral */
 836
 837         if (state == NULL) {
 838                 return;
 839         }
 840
 841         if (state->sock != -1) {
 842                 /* tell client, we are closing ... */
 843                 nwritten = write(state->sock, &c, sizeof(c));
 844                 if (nwritten == -1) {
 845                         DEBUG(2, ("final write to client failed: %s\n",
 846                                 strerror(errno)));
 847                 }
 848
 849                 /* Close socket */
 850
 851                 close(state->sock);
 852                 state->sock = -1;
 853         }
 854
 855         TALLOC_FREE(state->mem_ctx);
 856
 857         /* Remove from list and free */
 858
 859         winbindd_remove_client(state);
 860         TALLOC_FREE(state);
 861 }
 862
 863 /* Is a client idle? */
 864
 865 static bool client_is_idle(struct winbindd_cli_state *state) {
 866   return (state->response == NULL &&
 867           !state->pwent_state && !state->grent_state);
 868 }
 869
 870 /* Shutdown client connection which has been idle for the longest time */
 871
 872 static bool remove_idle_client(void)
 873 {
 874         struct winbindd_cli_state *state, *remove_state = NULL;
 875         time_t last_access = 0;
 876         int nidle = 0;
 877
 878         for (state = winbindd_client_list(); state; state = state->next) {
 879                 if (client_is_idle(state)) {
 880                         nidle++;
 881                         if (!last_access || state->last_access < last_access) {
 882                                 last_access = state->last_access;
 883                                 remove_state = state;
 884                         }
 885                 }
 886         }
 887
 888         if (remove_state) {
 889                 DEBUG(5,("Found %d idle client connections, shutting down sock %d, pid %u\n",
 890                         nidle, remove_state->sock, (unsigned int)remove_state->pid));
 891                 remove_client(remove_state);
 892                 return True;
 893         }
 894
 895         return False;
 896 }
 897
 898 struct winbindd_listen_state {
 899         bool privileged;
 900         int fd;
 901 };
 902
 903 static void winbindd_listen_fde_handler(struct tevent_context *ev,
 904                                         struct tevent_fd *fde,
 905                                         uint16_t flags,
 906                                         void *private_data)
 907 {
 908         struct winbindd_listen_state *s = talloc_get_type_abort(private_data,
 909                                           struct winbindd_listen_state);
 910
 911         while (winbindd_num_clients() > lp_winbind_max_clients() - 1) {
 912                 DEBUG(5,("winbindd: Exceeding %d client "
 913                          "connections, removing idle "
 914                          "connection.\n", lp_winbind_max_clients()));
 915                 if (!remove_idle_client()) {
 916                         DEBUG(0,("winbindd: Exceeding %d "
 917                                  "client connections, no idle "
 918                                  "connection found\n",
 919                                  lp_winbind_max_clients()));
 920                         break;
 921                 }
 922         }
 923         new_connection(s->fd, s->privileged);
 924 }
 925
 926 /*
 927  * Winbindd socket accessor functions
 928  */
 929
 930 const char *get_winbind_pipe_dir(void)
 931 {
 932         return lp_parm_const_string(-1, "winbindd", "socket dir", WINBINDD_SOCKET_DIR);
 933 }
 934
 935 char *get_winbind_priv_pipe_dir(void)
 936 {
 937         return lock_path(WINBINDD_PRIV_SOCKET_SUBDIR);
 938 }
 939
 940 static bool winbindd_setup_listeners(void)
 941 {
 942         struct winbindd_listen_state *pub_state = NULL;
 943         struct winbindd_listen_state *priv_state = NULL;
 944         struct tevent_fd *fde;
 945
 946         pub_state = talloc(winbind_event_context(),
 947                            struct winbindd_listen_state);
 948         if (!pub_state) {
 949                 goto failed;
 950         }
 951
 952         pub_state->privileged = false;
 953         pub_state->fd = create_pipe_sock(
 954                 get_winbind_pipe_dir(), WINBINDD_SOCKET_NAME, 0755);
 955         if (pub_state->fd == -1) {
 956                 goto failed;
 957         }
 958
 959         fde = tevent_add_fd(winbind_event_context(), pub_state, pub_state->fd,
 960                             TEVENT_FD_READ, winbindd_listen_fde_handler,
 961                             pub_state);
 962         if (fde == NULL) {
 963                 close(pub_state->fd);
 964                 goto failed;
 965         }
 966         tevent_fd_set_auto_close(fde);
 967
 968         priv_state = talloc(winbind_event_context(),
 969                             struct winbindd_listen_state);
 970         if (!priv_state) {
 971                 goto failed;
 972         }
 973
 974         priv_state->privileged = true;
 975         priv_state->fd = create_pipe_sock(
 976                 get_winbind_priv_pipe_dir(), WINBINDD_SOCKET_NAME, 0750);
 977         if (priv_state->fd == -1) {
 978                 goto failed;
 979         }
 980
 981         fde = tevent_add_fd(winbind_event_context(), priv_state,
 982                             priv_state->fd, TEVENT_FD_READ,
 983                             winbindd_listen_fde_handler, priv_state);
 984         if (fde == NULL) {
 985                 close(priv_state->fd);
 986                 goto failed;
 987         }
 988         tevent_fd_set_auto_close(fde);
 989
 990         return true;
 991 failed:
 992         TALLOC_FREE(pub_state);
 993         TALLOC_FREE(priv_state);
 994         return false;
 995 }
 996
 997 bool winbindd_use_idmap_cache(void)
 998 {
 999         return !opt_nocache;
1000 }
1001
1002 bool winbindd_use_cache(void)
1003 {
1004         return !opt_nocache;
1005 }
1006
1007 void winbindd_register_handlers(void)
1008 {
1009         struct tevent_timer *te;
1010         /* Setup signal handlers */
1011
1012         if (!winbindd_setup_sig_term_handler(true))
1013                 exit(1);
1014         if (!winbindd_setup_sig_hup_handler(NULL))
1015                 exit(1);
1016         if (!winbindd_setup_sig_chld_handler())
1017                 exit(1);
1018         if (!winbindd_setup_sig_usr2_handler())
1019                 exit(1);
1020
1021         CatchSignal(SIGPIPE, SIG_IGN);                 /* Ignore sigpipe */
1022
1023         /*
1024          * Ensure all cache and idmap caches are consistent
1025          * and initialized before we startup.
1026          */
1027         if (!winbindd_cache_validate_and_initialize()) {
1028                 exit(1);
1029         }
1030
1031         /* get broadcast messages */
1032
1033         if (!serverid_register(procid_self(),
1034                                FLAG_MSG_GENERAL|FLAG_MSG_DBWRAP)) {
1035                 DEBUG(1, ("Could not register myself in serverid.tdb\n"));
1036                 exit(1);
1037         }
1038
1039         /* React on 'smbcontrol winbindd reload-config' in the same way
1040            as to SIGHUP signal */
1041         messaging_register(winbind_messaging_context(), NULL,
1042                            MSG_SMB_CONF_UPDATED, msg_reload_services);
1043         messaging_register(winbind_messaging_context(), NULL,
1044                            MSG_SHUTDOWN, msg_shutdown);
1045
1046         /* Handle online/offline messages. */
1047         messaging_register(winbind_messaging_context(), NULL,
1048                            MSG_WINBIND_OFFLINE, winbind_msg_offline);
1049         messaging_register(winbind_messaging_context(), NULL,
1050                            MSG_WINBIND_ONLINE, winbind_msg_online);
1051         messaging_register(winbind_messaging_context(), NULL,
1052                            MSG_WINBIND_ONLINESTATUS, winbind_msg_onlinestatus);
1053
1054         messaging_register(winbind_messaging_context(), NULL,
1055                            MSG_DUMP_EVENT_LIST, winbind_msg_dump_event_list);
1056
1057         messaging_register(winbind_messaging_context(), NULL,
1058                            MSG_WINBIND_VALIDATE_CACHE,
1059                            winbind_msg_validate_cache);
1060
1061         messaging_register(winbind_messaging_context(), NULL,
1062                            MSG_WINBIND_DUMP_DOMAIN_LIST,
1063                            winbind_msg_dump_domain_list);
1064
1065         messaging_register(winbind_messaging_context(), NULL,
1066                            MSG_WINBIND_IP_DROPPED,
1067                            winbind_msg_ip_dropped_parent);
1068
1069         /* Register handler for MSG_DEBUG. */
1070         messaging_register(winbind_messaging_context(), NULL,
1071                            MSG_DEBUG,
1072                            winbind_msg_debug);
1073
1074         netsamlogon_cache_init(); /* Non-critical */
1075
1076         /* clear the cached list of trusted domains */
1077
1078         wcache_tdc_clear();
1079
1080         if (!init_domain_list()) {
1081                 DEBUG(0,("unable to initialize domain list\n"));
1082                 exit(1);
1083         }
1084
1085         init_idmap_child();
1086         init_locator_child();
1087
1088         smb_nscd_flush_user_cache();
1089         smb_nscd_flush_group_cache();
1090
1091         te = tevent_add_timer(winbind_event_context(), NULL, timeval_zero(),
1092                               rescan_trusted_domains, NULL);
1093         if (te == NULL) {
1094                 DEBUG(0, ("Could not trigger rescan_trusted_domains()\n"));
1095                 exit(1);
1096         }
1097
1098 }
1099
1100 /* Main function */
1101
1102 int main(int argc, char **argv, char **envp)
1103 {
1104         static bool is_daemon = False;
1105         static bool Fork = True;
1106         static bool log_stdout = False;
1107         static bool no_process_group = False;
1108         enum {
1109                 OPT_DAEMON = 1000,
1110                 OPT_FORK,
1111                 OPT_NO_PROCESS_GROUP,
1112                 OPT_LOG_STDOUT
1113         };
1114         struct poptOption long_options[] = {
1115                 POPT_AUTOHELP
1116                 { "stdout", 'S', POPT_ARG_NONE, NULL, OPT_LOG_STDOUT, "Log to stdout" },
1117                 { "foreground", 'F', POPT_ARG_NONE, NULL, OPT_FORK, "Daemon in foreground mode" },
1118                 { "no-process-group", 0, POPT_ARG_NONE, NULL, OPT_NO_PROCESS_GROUP, "Don't create a new process group" },
1119                 { "daemon", 'D', POPT_ARG_NONE, NULL, OPT_DAEMON, "Become a daemon (default)" },
1120                 { "interactive", 'i', POPT_ARG_NONE, NULL, 'i', "Interactive mode" },
1121                 { "no-caching", 'n', POPT_ARG_NONE, NULL, 'n', "Disable caching" },
1122                 POPT_COMMON_SAMBA
1123                 POPT_TABLEEND
1124         };
1125         poptContext pc;
1126         int opt;
1127         TALLOC_CTX *frame;
1128         NTSTATUS status;
1129
1130         /*
1131          * Do this before any other talloc operation
1132          */
1133         talloc_enable_null_tracking();
1134         frame = talloc_stackframe();
1135
1136         /* glibc (?) likes to print "User defined signal 1" and exit if a
1137            SIGUSR[12] is received before a handler is installed */
1138
1139         CatchSignal(SIGUSR1, SIG_IGN);
1140         CatchSignal(SIGUSR2, SIG_IGN);
1141
1142         fault_setup((void (*)(void *))fault_quit );
1143         dump_core_setup("winbindd");
1144
1145         load_case_tables();
1146
1147         /* Initialise for running in non-root mode */
1148
1149         sec_init();
1150
1151         set_remote_machine_name("winbindd", False);
1152
1153         /* Set environment variable so we don't recursively call ourselves.
1154            This may also be useful interactively. */
1155
1156         if ( !winbind_off() ) {
1157                 DEBUG(0,("Failed to disable recusive winbindd calls.  Exiting.\n"));
1158                 exit(1);
1159         }
1160
1161         /* Initialise samba/rpc client stuff */
1162
1163         pc = poptGetContext("winbindd", argc, (const char **)argv, long_options, 0);
1164
1165         while ((opt = poptGetNextOpt(pc)) != -1) {
1166                 switch (opt) {
1167                         /* Don't become a daemon */
1168                 case OPT_DAEMON:
1169                         is_daemon = True;
1170                         break;
1171                 case 'i':
1172                         interactive = True;
1173                         log_stdout = True;
1174                         Fork = False;
1175                         break;
1176                 case OPT_FORK:
1177                         Fork = false;
1178                         break;
1179                 case OPT_NO_PROCESS_GROUP:
1180                         no_process_group = true;
1181                         break;
1182                 case OPT_LOG_STDOUT:
1183                         log_stdout = true;
1184                         break;
1185                 case 'n':
1186                         opt_nocache = true;
1187                         break;
1188                 default:
1189                         d_fprintf(stderr, "\nInvalid option %s: %s\n\n",
1190                                   poptBadOption(pc, 0), poptStrerror(opt));
1191                         poptPrintUsage(pc, stderr, 0);
1192                         exit(1);
1193                 }
1194         }
1195
1196         if (is_daemon && interactive) {
1197                 d_fprintf(stderr,"\nERROR: "
1198                           "Option -i|--interactive is not allowed together with -D|--daemon\n\n");
1199                 poptPrintUsage(pc, stderr, 0);
1200                 exit(1);
1201         }
1202
1203         if (log_stdout && Fork) {
1204                 d_fprintf(stderr, "\nERROR: "
1205                           "Can't log to stdout (-S) unless daemon is in foreground +(-F) or interactive (-i)\n\n");
1206                 poptPrintUsage(pc, stderr, 0);
1207                 exit(1);
1208         }
1209
1210         poptFreeContext(pc);
1211
1212         if (!override_logfile) {
1213                 char *lfile = NULL;
1214                 if (asprintf(&lfile,"%s/log.winbindd",
1215                                 get_dyn_LOGFILEBASE()) > 0) {
1216                         lp_set_logfile(lfile);
1217                         SAFE_FREE(lfile);
1218                 }
1219         }
1220         if (log_stdout) {
1221                 setup_logging("winbindd", DEBUG_STDOUT);
1222         } else {
1223                 setup_logging("winbindd", DEBUG_FILE);
1224         }
1225         reopen_logs();
1226
1227         DEBUG(0,("winbindd version %s started.\n", samba_version_string()));
1228         DEBUGADD(0,("%s\n", COPYRIGHT_STARTUP_MESSAGE));
1229
1230         if (!lp_load_initial_only(get_dyn_CONFIGFILE())) {
1231                 DEBUG(0, ("error opening config file\n"));
1232                 exit(1);
1233         }
1234
1235         /* Initialise messaging system */
1236
1237         if (winbind_messaging_context() == NULL) {
1238                 exit(1);
1239         }
1240
1241         if (!reload_services_file(NULL)) {
1242                 DEBUG(0, ("error opening config file\n"));
1243                 exit(1);
1244         }
1245
1246         if (!directory_exist(lp_lockdir())) {
1247                 mkdir(lp_lockdir(), 0755);
1248         }
1249
1250         /* Setup names. */
1251
1252         if (!init_names())
1253                 exit(1);
1254
1255         load_interfaces();
1256
1257         if (!secrets_init()) {
1258
1259                 DEBUG(0,("Could not initialize domain trust account secrets. Giving up\n"));
1260                 return False;
1261         }
1262
1263         /* Unblock all signals we are interested in as they may have been
1264            blocked by the parent process. */
1265
1266         BlockSignals(False, SIGINT);
1267         BlockSignals(False, SIGQUIT);
1268         BlockSignals(False, SIGTERM);
1269         BlockSignals(False, SIGUSR1);
1270         BlockSignals(False, SIGUSR2);
1271         BlockSignals(False, SIGHUP);
1272         BlockSignals(False, SIGCHLD);
1273
1274         if (!interactive)
1275                 become_daemon(Fork, no_process_group, log_stdout);
1276
1277         pidfile_create("winbindd");
1278
1279 #if HAVE_SETPGID
1280         /*
1281          * If we're interactive we want to set our own process group for
1282          * signal management.
1283          */
1284         if (interactive && !no_process_group)
1285                 setpgid( (pid_t)0, (pid_t)0);
1286 #endif
1287
1288         TimeInit();
1289
1290         /* Don't use winbindd_reinit_after_fork here as
1291          * we're just starting up and haven't created any
1292          * winbindd-specific resources we must free yet. JRA.
1293          */
1294
1295         status = reinit_after_fork(winbind_messaging_context(),
1296                                    winbind_event_context(),
1297                                    procid_self(), false);
1298         if (!NT_STATUS_IS_OK(status)) {
1299                 DEBUG(0,("reinit_after_fork() failed\n"));
1300                 exit(1);
1301         }
1302
1303         winbindd_register_handlers();
1304
1305         if (!init_system_info()) {
1306                 DEBUG(0,("ERROR: failed to setup system user info.\n"));
1307                 exit(1);
1308         }
1309
1310         rpc_lsarpc_init(NULL);
1311         rpc_samr_init(NULL);
1312
1313         /* setup listen sockets */
1314
1315         if (!winbindd_setup_listeners()) {
1316                 DEBUG(0,("winbindd_setup_listeners() failed\n"));
1317                 exit(1);
1318         }
1319
1320         TALLOC_FREE(frame);
1321         /* Loop waiting for requests */
1322         while (1) {
1323                 frame = talloc_stackframe();
1324
1325                 if (tevent_loop_once(winbind_event_context()) == -1) {
1326                         DEBUG(1, ("tevent_loop_once() failed: %s\n",
1327                                   strerror(errno)));
1328                         return 1;
1329                 }
1330
1331                 TALLOC_FREE(frame);
1332         }
1333
1334         return 0;
1335 }