source3/winbindd/winbindd.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3
   4    Winbind daemon for ntdom nss module
   5
   6    Copyright (C) by Tim Potter 2000-2002
   7    Copyright (C) Andrew Tridgell 2002
   8    Copyright (C) Jelmer Vernooij 2003
   9    Copyright (C) Volker Lendecke 2004
  10
  11    This program is free software; you can redistribute it and/or modify
  12    it under the terms of the GNU General Public License as published by
  13    the Free Software Foundation; either version 3 of the License, or
  14    (at your option) any later version.
  15
  16    This program is distributed in the hope that it will be useful,
  17    but WITHOUT ANY WARRANTY; without even the implied warranty of
  18    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19    GNU General Public License for more details.
  20
  21    You should have received a copy of the GNU General Public License
  22    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  23 */
  24
  25 #include "includes.h"
  26 #include "winbindd.h"
  27 #include "../../nsswitch/libwbclient/wbc_async.h"
  28
  29 #undef DBGC_CLASS
  30 #define DBGC_CLASS DBGC_WINBIND
  31
  32 static void remove_client(struct winbindd_cli_state *state);
  33
  34 static bool opt_nocache = False;
  35 static bool interactive = False;
  36
  37 extern bool override_logfile;
  38
  39 struct event_context *winbind_event_context(void)
  40 {
  41         static struct event_context *ctx;
  42
  43         if (!ctx && !(ctx = event_context_init(NULL))) {
  44                 smb_panic("Could not init winbind event context");
  45         }
  46         return ctx;
  47 }
  48
  49 struct messaging_context *winbind_messaging_context(void)
  50 {
  51         static struct messaging_context *ctx;
  52
  53         if (ctx == NULL) {
  54                 ctx = messaging_init(NULL, procid_self(),
  55                                      winbind_event_context());
  56         }
  57         if (ctx == NULL) {
  58                 DEBUG(0, ("Could not init winbind messaging context.\n"));
  59         }
  60         return ctx;
  61 }
  62
  63 /* Reload configuration */
  64
  65 static bool reload_services_file(const char *lfile)
  66 {
  67         bool ret;
  68
  69         if (lp_loaded()) {
  70                 const char *fname = lp_configfile();
  71
  72                 if (file_exist(fname) && !strcsequal(fname,get_dyn_CONFIGFILE())) {
  73                         set_dyn_CONFIGFILE(fname);
  74                 }
  75         }
  76
  77         /* if this is a child, restore the logfile to the special
  78            name - <domain>, idmap, etc. */
  79         if (lfile && *lfile) {
  80                 lp_set_logfile(lfile);
  81         }
  82
  83         reopen_logs();
  84         ret = lp_load(get_dyn_CONFIGFILE(),False,False,True,True);
  85
  86         reopen_logs();
  87         load_interfaces();
  88
  89         return(ret);
  90 }
  91
  92
  93 /**************************************************************************** **
  94  Handle a fault..
  95  **************************************************************************** */
  96
  97 static void fault_quit(void)
  98 {
  99         dump_core();
 100 }
 101
 102 static void winbindd_status(void)
 103 {
 104         struct winbindd_cli_state *tmp;
 105
 106         DEBUG(0, ("winbindd status:\n"));
 107
 108         /* Print client state information */
 109
 110         DEBUG(0, ("\t%d clients currently active\n", winbindd_num_clients()));
 111
 112         if (DEBUGLEVEL >= 2 && winbindd_num_clients()) {
 113                 DEBUG(2, ("\tclient list:\n"));
 114                 for(tmp = winbindd_client_list(); tmp; tmp = tmp->next) {
 115                         DEBUGADD(2, ("\t\tpid %lu, sock %d\n",
 116                                   (unsigned long)tmp->pid, tmp->sock));
 117                 }
 118         }
 119 }
 120
 121 /* Print winbindd status to log file */
 122
 123 static void print_winbindd_status(void)
 124 {
 125         winbindd_status();
 126 }
 127
 128 /* Flush client cache */
 129
 130 static void flush_caches(void)
 131 {
 132         /* We need to invalidate cached user list entries on a SIGHUP
 133            otherwise cached access denied errors due to restrict anonymous
 134            hang around until the sequence number changes. */
 135
 136         if (!wcache_invalidate_cache()) {
 137                 DEBUG(0, ("invalidating the cache failed; revalidate the cache\n"));
 138                 if (!winbindd_cache_validate_and_initialize()) {
 139                         exit(1);
 140                 }
 141         }
 142 }
 143
 144 static void flush_caches_noinit(void)
 145 {
 146         /*
 147          * We need to invalidate cached user list entries on a SIGHUP
 148          * otherwise cached access denied errors due to restrict anonymous
 149          * hang around until the sequence number changes.
 150          * NB
 151          * Skip uninitialized domains when flush cache.
 152          * If domain is not initialized, it means it is never
 153          * used or never become online. look, wcache_invalidate_cache()
 154          * -> get_cache() -> init_dc_connection(). It causes a lot of traffic
 155          * for unused domains and large traffic for primay domain's DC if there
 156          * are many domains..
 157          */
 158
 159         if (!wcache_invalidate_cache_noinit()) {
 160                 DEBUG(0, ("invalidating the cache failed; revalidate the cache\n"));
 161                 if (!winbindd_cache_validate_and_initialize()) {
 162                         exit(1);
 163                 }
 164         }
 165 }
 166
 167 /* Handle the signal by unlinking socket and exiting */
 168
 169 static void terminate(bool is_parent)
 170 {
 171         if (is_parent) {
 172                 /* When parent goes away we should
 173                  * remove the socket file. Not so
 174                  * when children terminate.
 175                  */
 176                 char *path = NULL;
 177
 178                 if (asprintf(&path, "%s/%s",
 179                         get_winbind_pipe_dir(), WINBINDD_SOCKET_NAME) > 0) {
 180                         unlink(path);
 181                         SAFE_FREE(path);
 182                 }
 183         }
 184
 185         idmap_close();
 186
 187         trustdom_cache_shutdown();
 188
 189         gencache_stabilize();
 190
 191 #if 0
 192         if (interactive) {
 193                 TALLOC_CTX *mem_ctx = talloc_init("end_description");
 194                 char *description = talloc_describe_all(mem_ctx);
 195
 196                 DEBUG(3, ("tallocs left:\n%s\n", description));
 197                 talloc_destroy(mem_ctx);
 198         }
 199 #endif
 200
 201         if (is_parent) {
 202                 serverid_deregister_self();
 203                 pidfile_unlink();
 204         }
 205
 206         exit(0);
 207 }
 208
 209 static void winbindd_sig_term_handler(struct tevent_context *ev,
 210                                       struct tevent_signal *se,
 211                                       int signum,
 212                                       int count,
 213                                       void *siginfo,
 214                                       void *private_data)
 215 {
 216         bool *is_parent = talloc_get_type_abort(private_data, bool);
 217
 218         DEBUG(0,("Got sig[%d] terminate (is_parent=%d)\n",
 219                  signum, (int)*is_parent));
 220         terminate(*is_parent);
 221 }
 222
 223 bool winbindd_setup_sig_term_handler(bool parent)
 224 {
 225         struct tevent_signal *se;
 226         bool *is_parent;
 227
 228         is_parent = talloc(winbind_event_context(), bool);
 229         if (!is_parent) {
 230                 return false;
 231         }
 232
 233         *is_parent = parent;
 234
 235         se = tevent_add_signal(winbind_event_context(),
 236                                is_parent,
 237                                SIGTERM, 0,
 238                                winbindd_sig_term_handler,
 239                                is_parent);
 240         if (!se) {
 241                 DEBUG(0,("failed to setup SIGTERM handler"));
 242                 talloc_free(is_parent);
 243                 return false;
 244         }
 245
 246         se = tevent_add_signal(winbind_event_context(),
 247                                is_parent,
 248                                SIGINT, 0,
 249                                winbindd_sig_term_handler,
 250                                is_parent);
 251         if (!se) {
 252                 DEBUG(0,("failed to setup SIGINT handler"));
 253                 talloc_free(is_parent);
 254                 return false;
 255         }
 256
 257         se = tevent_add_signal(winbind_event_context(),
 258                                is_parent,
 259                                SIGQUIT, 0,
 260                                winbindd_sig_term_handler,
 261                                is_parent);
 262         if (!se) {
 263                 DEBUG(0,("failed to setup SIGINT handler"));
 264                 talloc_free(is_parent);
 265                 return false;
 266         }
 267
 268         return true;
 269 }
 270
 271 static void winbindd_sig_hup_handler(struct tevent_context *ev,
 272                                      struct tevent_signal *se,
 273                                      int signum,
 274                                      int count,
 275                                      void *siginfo,
 276                                      void *private_data)
 277 {
 278         const char *file = (const char *)private_data;
 279
 280         DEBUG(1,("Reloading services after SIGHUP\n"));
 281         flush_caches_noinit();
 282         reload_services_file(file);
 283 }
 284
 285 bool winbindd_setup_sig_hup_handler(const char *lfile)
 286 {
 287         struct tevent_signal *se;
 288         char *file = NULL;
 289
 290         if (lfile) {
 291                 file = talloc_strdup(winbind_event_context(),
 292                                      lfile);
 293                 if (!file) {
 294                         return false;
 295                 }
 296         }
 297
 298         se = tevent_add_signal(winbind_event_context(),
 299                                winbind_event_context(),
 300                                SIGHUP, 0,
 301                                winbindd_sig_hup_handler,
 302                                file);
 303         if (!se) {
 304                 return false;
 305         }
 306
 307         return true;
 308 }
 309
 310 static void winbindd_sig_chld_handler(struct tevent_context *ev,
 311                                       struct tevent_signal *se,
 312                                       int signum,
 313                                       int count,
 314                                       void *siginfo,
 315                                       void *private_data)
 316 {
 317         pid_t pid;
 318
 319         while ((pid = sys_waitpid(-1, NULL, WNOHANG)) > 0) {
 320                 winbind_child_died(pid);
 321         }
 322 }
 323
 324 static bool winbindd_setup_sig_chld_handler(void)
 325 {
 326         struct tevent_signal *se;
 327
 328         se = tevent_add_signal(winbind_event_context(),
 329                                winbind_event_context(),
 330                                SIGCHLD, 0,
 331                                winbindd_sig_chld_handler,
 332                                NULL);
 333         if (!se) {
 334                 return false;
 335         }
 336
 337         return true;
 338 }
 339
 340 static void winbindd_sig_usr2_handler(struct tevent_context *ev,
 341                                       struct tevent_signal *se,
 342                                       int signum,
 343                                       int count,
 344                                       void *siginfo,
 345                                       void *private_data)
 346 {
 347         print_winbindd_status();
 348 }
 349
 350 static bool winbindd_setup_sig_usr2_handler(void)
 351 {
 352         struct tevent_signal *se;
 353
 354         se = tevent_add_signal(winbind_event_context(),
 355                                winbind_event_context(),
 356                                SIGUSR2, 0,
 357                                winbindd_sig_usr2_handler,
 358                                NULL);
 359         if (!se) {
 360                 return false;
 361         }
 362
 363         return true;
 364 }
 365
 366 /* React on 'smbcontrol winbindd reload-config' in the same way as on SIGHUP*/
 367 static void msg_reload_services(struct messaging_context *msg,
 368                                 void *private_data,
 369                                 uint32_t msg_type,
 370                                 struct server_id server_id,
 371                                 DATA_BLOB *data)
 372 {
 373         /* Flush various caches */
 374         flush_caches();
 375         reload_services_file((const char *) private_data);
 376 }
 377
 378 /* React on 'smbcontrol winbindd shutdown' in the same way as on SIGTERM*/
 379 static void msg_shutdown(struct messaging_context *msg,
 380                          void *private_data,
 381                          uint32_t msg_type,
 382                          struct server_id server_id,
 383                          DATA_BLOB *data)
 384 {
 385         /* only the parent waits for this message */
 386         DEBUG(0,("Got shutdown message\n"));
 387         terminate(true);
 388 }
 389
 390
 391 static void winbind_msg_validate_cache(struct messaging_context *msg_ctx,
 392                                        void *private_data,
 393                                        uint32_t msg_type,
 394                                        struct server_id server_id,
 395                                        DATA_BLOB *data)
 396 {
 397         uint8 ret;
 398         pid_t child_pid;
 399         struct sigaction act;
 400         struct sigaction oldact;
 401
 402         DEBUG(10, ("winbindd_msg_validate_cache: got validate-cache "
 403                    "message.\n"));
 404
 405         /*
 406          * call the validation code from a child:
 407          * so we don't block the main winbindd and the validation
 408          * code can safely use fork/waitpid...
 409          */
 410         child_pid = sys_fork();
 411
 412         if (child_pid == -1) {
 413                 DEBUG(1, ("winbind_msg_validate_cache: Could not fork: %s\n",
 414                           strerror(errno)));
 415                 return;
 416         }
 417
 418         if (child_pid != 0) {
 419                 /* parent */
 420                 DEBUG(5, ("winbind_msg_validate_cache: child created with "
 421                           "pid %d.\n", (int)child_pid));
 422                 return;
 423         }
 424
 425         /* child */
 426
 427         if (!winbindd_reinit_after_fork(NULL)) {
 428                 _exit(0);
 429         }
 430
 431         ret = (uint8)winbindd_validate_cache_nobackup();
 432         DEBUG(10, ("winbindd_msg_validata_cache: got return value %d\n", ret));
 433         messaging_send_buf(msg_ctx, server_id, MSG_WINBIND_VALIDATE_CACHE, &ret,
 434                            (size_t)1);
 435         _exit(0);
 436 }
 437
 438 static struct winbindd_dispatch_table {
 439         enum winbindd_cmd cmd;
 440         void (*fn)(struct winbindd_cli_state *state);
 441         const char *winbindd_cmd_name;
 442 } dispatch_table[] = {
 443
 444         /* PAM auth functions */
 445
 446         { WINBINDD_PAM_AUTH, winbindd_pam_auth, "PAM_AUTH" },
 447         { WINBINDD_PAM_AUTH_CRAP, winbindd_pam_auth_crap, "AUTH_CRAP" },
 448         { WINBINDD_PAM_CHAUTHTOK, winbindd_pam_chauthtok, "CHAUTHTOK" },
 449         { WINBINDD_PAM_LOGOFF, winbindd_pam_logoff, "PAM_LOGOFF" },
 450         { WINBINDD_PAM_CHNG_PSWD_AUTH_CRAP, winbindd_pam_chng_pswd_auth_crap, "CHNG_PSWD_AUTH_CRAP" },
 451
 452         /* Enumeration functions */
 453
 454         { WINBINDD_LIST_TRUSTDOM, winbindd_list_trusted_domains,
 455           "LIST_TRUSTDOM" },
 456
 457         /* Miscellaneous */
 458
 459         { WINBINDD_INFO, winbindd_info, "INFO" },
 460         { WINBINDD_INTERFACE_VERSION, winbindd_interface_version,
 461           "INTERFACE_VERSION" },
 462         { WINBINDD_DOMAIN_NAME, winbindd_domain_name, "DOMAIN_NAME" },
 463         { WINBINDD_DOMAIN_INFO, winbindd_domain_info, "DOMAIN_INFO" },
 464         { WINBINDD_NETBIOS_NAME, winbindd_netbios_name, "NETBIOS_NAME" },
 465         { WINBINDD_PRIV_PIPE_DIR, winbindd_priv_pipe_dir,
 466           "WINBINDD_PRIV_PIPE_DIR" },
 467
 468         /* Credential cache access */
 469         { WINBINDD_CCACHE_NTLMAUTH, winbindd_ccache_ntlm_auth, "NTLMAUTH" },
 470         { WINBINDD_CCACHE_SAVE, winbindd_ccache_save, "CCACHE_SAVE" },
 471
 472         /* WINS functions */
 473
 474         { WINBINDD_WINS_BYNAME, winbindd_wins_byname, "WINS_BYNAME" },
 475         { WINBINDD_WINS_BYIP, winbindd_wins_byip, "WINS_BYIP" },
 476
 477         /* End of list */
 478
 479         { WINBINDD_NUM_CMDS, NULL, "NONE" }
 480 };
 481
 482 struct winbindd_async_dispatch_table {
 483         enum winbindd_cmd cmd;
 484         const char *cmd_name;
 485         struct tevent_req *(*send_req)(TALLOC_CTX *mem_ctx,
 486                                        struct tevent_context *ev,
 487                                        struct winbindd_cli_state *cli,
 488                                        struct winbindd_request *request);
 489         NTSTATUS (*recv_req)(struct tevent_req *req,
 490                              struct winbindd_response *presp);
 491 };
 492
 493 static struct winbindd_async_dispatch_table async_nonpriv_table[] = {
 494         { WINBINDD_PING, "PING",
 495           wb_ping_send, wb_ping_recv },
 496         { WINBINDD_LOOKUPSID, "LOOKUPSID",
 497           winbindd_lookupsid_send, winbindd_lookupsid_recv },
 498         { WINBINDD_LOOKUPNAME, "LOOKUPNAME",
 499           winbindd_lookupname_send, winbindd_lookupname_recv },
 500         { WINBINDD_SID_TO_UID, "SID_TO_UID",
 501           winbindd_sid_to_uid_send, winbindd_sid_to_uid_recv },
 502         { WINBINDD_SID_TO_GID, "SID_TO_GID",
 503           winbindd_sid_to_gid_send, winbindd_sid_to_gid_recv },
 504         { WINBINDD_UID_TO_SID, "UID_TO_SID",
 505           winbindd_uid_to_sid_send, winbindd_uid_to_sid_recv },
 506         { WINBINDD_GID_TO_SID, "GID_TO_SID",
 507           winbindd_gid_to_sid_send, winbindd_gid_to_sid_recv },
 508         { WINBINDD_GETPWSID, "GETPWSID",
 509           winbindd_getpwsid_send, winbindd_getpwsid_recv },
 510         { WINBINDD_GETPWNAM, "GETPWNAM",
 511           winbindd_getpwnam_send, winbindd_getpwnam_recv },
 512         { WINBINDD_GETPWUID, "GETPWUID",
 513           winbindd_getpwuid_send, winbindd_getpwuid_recv },
 514         { WINBINDD_GETSIDALIASES, "GETSIDALIASES",
 515           winbindd_getsidaliases_send, winbindd_getsidaliases_recv },
 516         { WINBINDD_GETUSERDOMGROUPS, "GETUSERDOMGROUPS",
 517           winbindd_getuserdomgroups_send, winbindd_getuserdomgroups_recv },
 518         { WINBINDD_GETGROUPS, "GETGROUPS",
 519           winbindd_getgroups_send, winbindd_getgroups_recv },
 520         { WINBINDD_SHOW_SEQUENCE, "SHOW_SEQUENCE",
 521           winbindd_show_sequence_send, winbindd_show_sequence_recv },
 522         { WINBINDD_GETGRGID, "GETGRGID",
 523           winbindd_getgrgid_send, winbindd_getgrgid_recv },
 524         { WINBINDD_GETGRNAM, "GETGRNAM",
 525           winbindd_getgrnam_send, winbindd_getgrnam_recv },
 526         { WINBINDD_GETUSERSIDS, "GETUSERSIDS",
 527           winbindd_getusersids_send, winbindd_getusersids_recv },
 528         { WINBINDD_LOOKUPRIDS, "LOOKUPRIDS",
 529           winbindd_lookuprids_send, winbindd_lookuprids_recv },
 530         { WINBINDD_SETPWENT, "SETPWENT",
 531           winbindd_setpwent_send, winbindd_setpwent_recv },
 532         { WINBINDD_GETPWENT, "GETPWENT",
 533           winbindd_getpwent_send, winbindd_getpwent_recv },
 534         { WINBINDD_ENDPWENT, "ENDPWENT",
 535           winbindd_endpwent_send, winbindd_endpwent_recv },
 536         { WINBINDD_DSGETDCNAME, "DSGETDCNAME",
 537           winbindd_dsgetdcname_send, winbindd_dsgetdcname_recv },
 538         { WINBINDD_GETDCNAME, "GETDCNAME",
 539           winbindd_getdcname_send, winbindd_getdcname_recv },
 540         { WINBINDD_SETGRENT, "SETGRENT",
 541           winbindd_setgrent_send, winbindd_setgrent_recv },
 542         { WINBINDD_GETGRENT, "GETGRENT",
 543           winbindd_getgrent_send, winbindd_getgrent_recv },
 544         { WINBINDD_ENDGRENT, "ENDGRENT",
 545           winbindd_endgrent_send, winbindd_endgrent_recv },
 546         { WINBINDD_LIST_USERS, "LIST_USERS",
 547           winbindd_list_users_send, winbindd_list_users_recv },
 548         { WINBINDD_LIST_GROUPS, "LIST_GROUPS",
 549           winbindd_list_groups_send, winbindd_list_groups_recv },
 550         { WINBINDD_CHECK_MACHACC, "CHECK_MACHACC",
 551           winbindd_check_machine_acct_send, winbindd_check_machine_acct_recv },
 552         { WINBINDD_PING_DC, "PING_DC",
 553           winbindd_ping_dc_send, winbindd_ping_dc_recv },
 554
 555         { 0, NULL, NULL, NULL }
 556 };
 557
 558 static struct winbindd_async_dispatch_table async_priv_table[] = {
 559         { WINBINDD_ALLOCATE_UID, "ALLOCATE_UID",
 560           winbindd_allocate_uid_send, winbindd_allocate_uid_recv },
 561         { WINBINDD_ALLOCATE_GID, "ALLOCATE_GID",
 562           winbindd_allocate_gid_send, winbindd_allocate_gid_recv },
 563         { WINBINDD_SET_MAPPING, "SET_MAPPING",
 564           winbindd_set_mapping_send, winbindd_set_mapping_recv },
 565         { WINBINDD_REMOVE_MAPPING, "SET_MAPPING",
 566           winbindd_remove_mapping_send, winbindd_remove_mapping_recv },
 567         { WINBINDD_SET_HWM, "SET_HWM",
 568           winbindd_set_hwm_send, winbindd_set_hwm_recv },
 569         { WINBINDD_CHANGE_MACHACC, "CHANGE_MACHACC",
 570           winbindd_change_machine_acct_send, winbindd_change_machine_acct_recv },
 571
 572         { 0, NULL, NULL, NULL }
 573 };
 574
 575 static void wb_request_done(struct tevent_req *req);
 576
 577 static void process_request(struct winbindd_cli_state *state)
 578 {
 579         struct winbindd_dispatch_table *table = dispatch_table;
 580         struct winbindd_async_dispatch_table *atable;
 581
 582         state->mem_ctx = talloc_init("winbind request");
 583         if (state->mem_ctx == NULL)
 584                 return;
 585
 586         /* Remember who asked us. */
 587         state->pid = state->request->pid;
 588
 589         state->cmd_name = "unknown request";
 590         state->recv_fn = NULL;
 591
 592         /* Process command */
 593
 594         for (atable = async_nonpriv_table; atable->send_req; atable += 1) {
 595                 if (state->request->cmd == atable->cmd) {
 596                         break;
 597                 }
 598         }
 599
 600         if ((atable->send_req == NULL) && state->privileged) {
 601                 for (atable = async_priv_table; atable->send_req;
 602                      atable += 1) {
 603                         if (state->request->cmd == atable->cmd) {
 604                                 break;
 605                         }
 606                 }
 607         }
 608
 609         if (atable->send_req != NULL) {
 610                 struct tevent_req *req;
 611
 612                 state->cmd_name = atable->cmd_name;
 613                 state->recv_fn = atable->recv_req;
 614
 615                 DEBUG(10, ("process_request: Handling async request %d:%s\n",
 616                            (int)state->pid, state->cmd_name));
 617
 618                 req = atable->send_req(state->mem_ctx, winbind_event_context(),
 619                                        state, state->request);
 620                 if (req == NULL) {
 621                         DEBUG(0, ("process_request: atable->send failed for "
 622                                   "%s\n", atable->cmd_name));
 623                         request_error(state);
 624                         return;
 625                 }
 626                 tevent_req_set_callback(req, wb_request_done, state);
 627                 return;
 628         }
 629
 630         state->response = talloc_zero(state->mem_ctx,
 631                                       struct winbindd_response);
 632         if (state->response == NULL) {
 633                 DEBUG(10, ("talloc failed\n"));
 634                 remove_client(state);
 635                 return;
 636         }
 637         state->response->result = WINBINDD_PENDING;
 638         state->response->length = sizeof(struct winbindd_response);
 639
 640         for (table = dispatch_table; table->fn; table++) {
 641                 if (state->request->cmd == table->cmd) {
 642                         DEBUG(10,("process_request: request fn %s\n",
 643                                   table->winbindd_cmd_name ));
 644                         state->cmd_name = table->winbindd_cmd_name;
 645                         table->fn(state);
 646                         break;
 647                 }
 648         }
 649
 650         if (!table->fn) {
 651                 DEBUG(10,("process_request: unknown request fn number %d\n",
 652                           (int)state->request->cmd ));
 653                 request_error(state);
 654         }
 655 }
 656
 657 static void wb_request_done(struct tevent_req *req)
 658 {
 659         struct winbindd_cli_state *state = tevent_req_callback_data(
 660                 req, struct winbindd_cli_state);
 661         NTSTATUS status;
 662
 663         state->response = talloc_zero(state->mem_ctx,
 664                                       struct winbindd_response);
 665         if (state->response == NULL) {
 666                 DEBUG(0, ("wb_request_done[%d:%s]: talloc_zero failed - removing client\n",
 667                           (int)state->pid, state->cmd_name));
 668                 remove_client(state);
 669                 return;
 670         }
 671         state->response->result = WINBINDD_PENDING;
 672         state->response->length = sizeof(struct winbindd_response);
 673
 674         status = state->recv_fn(req, state->response);
 675         TALLOC_FREE(req);
 676
 677         DEBUG(10,("wb_request_done[%d:%s]: %s\n",
 678                   (int)state->pid, state->cmd_name, nt_errstr(status)));
 679
 680         if (!NT_STATUS_IS_OK(status)) {
 681                 request_error(state);
 682                 return;
 683         }
 684         request_ok(state);
 685 }
 686
 687 /*
 688  * This is the main event loop of winbind requests. It goes through a
 689  * state-machine of 3 read/write requests, 4 if you have extra data to send.
 690  *
 691  * An idle winbind client has a read request of 4 bytes outstanding,
 692  * finalizing function is request_len_recv, checking the length. request_recv
 693  * then processes the packet. The processing function then at some point has
 694  * to call request_finished which schedules sending the response.
 695  */
 696
 697 static void request_finished(struct winbindd_cli_state *state);
 698
 699 static void winbind_client_request_read(struct tevent_req *req);
 700 static void winbind_client_response_written(struct tevent_req *req);
 701
 702 static void request_finished(struct winbindd_cli_state *state)
 703 {
 704         struct tevent_req *req;
 705
 706         TALLOC_FREE(state->request);
 707
 708         req = wb_resp_write_send(state, winbind_event_context(),
 709                                  state->out_queue, state->sock,
 710                                  state->response);
 711         if (req == NULL) {
 712                 DEBUG(10,("request_finished[%d:%s]: wb_resp_write_send() failed\n",
 713                           (int)state->pid, state->cmd_name));
 714                 remove_client(state);
 715                 return;
 716         }
 717         tevent_req_set_callback(req, winbind_client_response_written, state);
 718 }
 719
 720 static void winbind_client_response_written(struct tevent_req *req)
 721 {
 722         struct winbindd_cli_state *state = tevent_req_callback_data(
 723                 req, struct winbindd_cli_state);
 724         ssize_t ret;
 725         int err;
 726
 727         ret = wb_resp_write_recv(req, &err);
 728         TALLOC_FREE(req);
 729         if (ret == -1) {
 730                 close(state->sock);
 731                 state->sock = -1;
 732                 DEBUG(2, ("Could not write response[%d:%s] to client: %s\n",
 733                           (int)state->pid, state->cmd_name, strerror(err)));
 734                 remove_client(state);
 735                 return;
 736         }
 737
 738         DEBUG(10,("winbind_client_response_written[%d:%s]: delivered response "
 739                   "to client\n", (int)state->pid, state->cmd_name));
 740
 741         TALLOC_FREE(state->mem_ctx);
 742         state->response = NULL;
 743         state->cmd_name = "no request";
 744         state->recv_fn = NULL;
 745
 746         req = wb_req_read_send(state, winbind_event_context(), state->sock,
 747                                WINBINDD_MAX_EXTRA_DATA);
 748         if (req == NULL) {
 749                 remove_client(state);
 750                 return;
 751         }
 752         tevent_req_set_callback(req, winbind_client_request_read, state);
 753 }
 754
 755 void request_error(struct winbindd_cli_state *state)
 756 {
 757         SMB_ASSERT(state->response->result == WINBINDD_PENDING);
 758         state->response->result = WINBINDD_ERROR;
 759         request_finished(state);
 760 }
 761
 762 void request_ok(struct winbindd_cli_state *state)
 763 {
 764         SMB_ASSERT(state->response->result == WINBINDD_PENDING);
 765         state->response->result = WINBINDD_OK;
 766         request_finished(state);
 767 }
 768
 769 /* Process a new connection by adding it to the client connection list */
 770
 771 static void new_connection(int listen_sock, bool privileged)
 772 {
 773         struct sockaddr_un sunaddr;
 774         struct winbindd_cli_state *state;
 775         struct tevent_req *req;
 776         socklen_t len;
 777         int sock;
 778
 779         /* Accept connection */
 780
 781         len = sizeof(sunaddr);
 782
 783         do {
 784                 sock = accept(listen_sock, (struct sockaddr *)(void *)&sunaddr,
 785                               &len);
 786         } while (sock == -1 && errno == EINTR);
 787
 788         if (sock == -1)
 789                 return;
 790
 791         DEBUG(6,("accepted socket %d\n", sock));
 792
 793         /* Create new connection structure */
 794
 795         if ((state = TALLOC_ZERO_P(NULL, struct winbindd_cli_state)) == NULL) {
 796                 close(sock);
 797                 return;
 798         }
 799
 800         state->sock = sock;
 801
 802         state->out_queue = tevent_queue_create(state, "winbind client reply");
 803         if (state->out_queue == NULL) {
 804                 close(sock);
 805                 TALLOC_FREE(state);
 806                 return;
 807         }
 808
 809         state->last_access = time(NULL);
 810
 811         state->privileged = privileged;
 812
 813         req = wb_req_read_send(state, winbind_event_context(), state->sock,
 814                                WINBINDD_MAX_EXTRA_DATA);
 815         if (req == NULL) {
 816                 TALLOC_FREE(state);
 817                 close(sock);
 818                 return;
 819         }
 820         tevent_req_set_callback(req, winbind_client_request_read, state);
 821
 822         /* Add to connection list */
 823
 824         winbindd_add_client(state);
 825 }
 826
 827 static void winbind_client_request_read(struct tevent_req *req)
 828 {
 829         struct winbindd_cli_state *state = tevent_req_callback_data(
 830                 req, struct winbindd_cli_state);
 831         ssize_t ret;
 832         int err;
 833
 834         ret = wb_req_read_recv(req, state, &state->request, &err);
 835         TALLOC_FREE(req);
 836         if (ret == -1) {
 837                 if (err == EPIPE) {
 838                         DEBUG(6, ("closing socket %d, client exited\n",
 839                                   state->sock));
 840                 } else {
 841                         DEBUG(2, ("Could not read client request from fd %d: "
 842                                   "%s\n", state->sock, strerror(err)));
 843                 }
 844                 close(state->sock);
 845                 state->sock = -1;
 846                 remove_client(state);
 847                 return;
 848         }
 849         process_request(state);
 850 }
 851
 852 /* Remove a client connection from client connection list */
 853
 854 static void remove_client(struct winbindd_cli_state *state)
 855 {
 856         char c = 0;
 857         int nwritten;
 858
 859         /* It's a dead client - hold a funeral */
 860
 861         if (state == NULL) {
 862                 return;
 863         }
 864
 865         if (state->sock != -1) {
 866                 /* tell client, we are closing ... */
 867                 nwritten = write(state->sock, &c, sizeof(c));
 868                 if (nwritten == -1) {
 869                         DEBUG(2, ("final write to client failed: %s\n",
 870                                 strerror(errno)));
 871                 }
 872
 873                 /* Close socket */
 874
 875                 close(state->sock);
 876                 state->sock = -1;
 877         }
 878
 879         TALLOC_FREE(state->mem_ctx);
 880
 881         /* Remove from list and free */
 882
 883         winbindd_remove_client(state);
 884         TALLOC_FREE(state);
 885 }
 886
 887 /* Shutdown client connection which has been idle for the longest time */
 888
 889 static bool remove_idle_client(void)
 890 {
 891         struct winbindd_cli_state *state, *remove_state = NULL;
 892         time_t last_access = 0;
 893         int nidle = 0;
 894
 895         for (state = winbindd_client_list(); state; state = state->next) {
 896                 if (state->response == NULL &&
 897                     !state->pwent_state && !state->grent_state) {
 898                         nidle++;
 899                         if (!last_access || state->last_access < last_access) {
 900                                 last_access = state->last_access;
 901                                 remove_state = state;
 902                         }
 903                 }
 904         }
 905
 906         if (remove_state) {
 907                 DEBUG(5,("Found %d idle client connections, shutting down sock %d, pid %u\n",
 908                         nidle, remove_state->sock, (unsigned int)remove_state->pid));
 909                 remove_client(remove_state);
 910                 return True;
 911         }
 912
 913         return False;
 914 }
 915
 916 struct winbindd_listen_state {
 917         bool privileged;
 918         int fd;
 919 };
 920
 921 static void winbindd_listen_fde_handler(struct tevent_context *ev,
 922                                         struct tevent_fd *fde,
 923                                         uint16_t flags,
 924                                         void *private_data)
 925 {
 926         struct winbindd_listen_state *s = talloc_get_type_abort(private_data,
 927                                           struct winbindd_listen_state);
 928
 929         while (winbindd_num_clients() >
 930                WINBINDD_MAX_SIMULTANEOUS_CLIENTS - 1) {
 931                 DEBUG(5,("winbindd: Exceeding %d client "
 932                          "connections, removing idle "
 933                          "connection.\n",
 934                          WINBINDD_MAX_SIMULTANEOUS_CLIENTS));
 935                 if (!remove_idle_client()) {
 936                         DEBUG(0,("winbindd: Exceeding %d "
 937                                  "client connections, no idle "
 938                                  "connection found\n",
 939                                  WINBINDD_MAX_SIMULTANEOUS_CLIENTS));
 940                         break;
 941                 }
 942         }
 943         new_connection(s->fd, s->privileged);
 944 }
 945
 946 static bool winbindd_setup_listeners(void)
 947 {
 948         struct winbindd_listen_state *pub_state = NULL;
 949         struct winbindd_listen_state *priv_state = NULL;
 950         struct tevent_fd *fde;
 951
 952         pub_state = talloc(winbind_event_context(),
 953                            struct winbindd_listen_state);
 954         if (!pub_state) {
 955                 goto failed;
 956         }
 957
 958         pub_state->privileged = false;
 959         pub_state->fd = open_winbindd_socket();
 960         if (pub_state->fd == -1) {
 961                 goto failed;
 962         }
 963
 964         fde = tevent_add_fd(winbind_event_context(), pub_state, pub_state->fd,
 965                             TEVENT_FD_READ, winbindd_listen_fde_handler,
 966                             pub_state);
 967         if (fde == NULL) {
 968                 close(pub_state->fd);
 969                 goto failed;
 970         }
 971         tevent_fd_set_auto_close(fde);
 972
 973         priv_state = talloc(winbind_event_context(),
 974                             struct winbindd_listen_state);
 975         if (!priv_state) {
 976                 goto failed;
 977         }
 978
 979         priv_state->privileged = true;
 980         priv_state->fd = open_winbindd_priv_socket();
 981         if (priv_state->fd == -1) {
 982                 goto failed;
 983         }
 984
 985         fde = tevent_add_fd(winbind_event_context(), priv_state,
 986                             priv_state->fd, TEVENT_FD_READ,
 987                             winbindd_listen_fde_handler, priv_state);
 988         if (fde == NULL) {
 989                 close(priv_state->fd);
 990                 goto failed;
 991         }
 992         tevent_fd_set_auto_close(fde);
 993
 994         return true;
 995 failed:
 996         TALLOC_FREE(pub_state);
 997         TALLOC_FREE(priv_state);
 998         return false;
 999 }
1000
1001 bool winbindd_use_idmap_cache(void)
1002 {
1003         return !opt_nocache;
1004 }
1005
1006 bool winbindd_use_cache(void)
1007 {
1008         return !opt_nocache;
1009 }
1010
1011 /* Main function */
1012
1013 int main(int argc, char **argv, char **envp)
1014 {
1015         static bool is_daemon = False;
1016         static bool Fork = True;
1017         static bool log_stdout = False;
1018         static bool no_process_group = False;
1019         enum {
1020                 OPT_DAEMON = 1000,
1021                 OPT_FORK,
1022                 OPT_NO_PROCESS_GROUP,
1023                 OPT_LOG_STDOUT
1024         };
1025         struct poptOption long_options[] = {
1026                 POPT_AUTOHELP
1027                 { "stdout", 'S', POPT_ARG_NONE, NULL, OPT_LOG_STDOUT, "Log to stdout" },
1028                 { "foreground", 'F', POPT_ARG_NONE, NULL, OPT_FORK, "Daemon in foreground mode" },
1029                 { "no-process-group", 0, POPT_ARG_NONE, NULL, OPT_NO_PROCESS_GROUP, "Don't create a new process group" },
1030                 { "daemon", 'D', POPT_ARG_NONE, NULL, OPT_DAEMON, "Become a daemon (default)" },
1031                 { "interactive", 'i', POPT_ARG_NONE, NULL, 'i', "Interactive mode" },
1032                 { "no-caching", 'n', POPT_ARG_NONE, NULL, 'n', "Disable caching" },
1033                 POPT_COMMON_SAMBA
1034                 POPT_TABLEEND
1035         };
1036         poptContext pc;
1037         int opt;
1038         TALLOC_CTX *frame = talloc_stackframe();
1039         struct tevent_timer *te;
1040
1041         /* glibc (?) likes to print "User defined signal 1" and exit if a
1042            SIGUSR[12] is received before a handler is installed */
1043
1044         CatchSignal(SIGUSR1, SIG_IGN);
1045         CatchSignal(SIGUSR2, SIG_IGN);
1046
1047         fault_setup((void (*)(void *))fault_quit );
1048         dump_core_setup("winbindd");
1049
1050         load_case_tables();
1051
1052         /* Initialise for running in non-root mode */
1053
1054         sec_init();
1055
1056         set_remote_machine_name("winbindd", False);
1057
1058         /* Set environment variable so we don't recursively call ourselves.
1059            This may also be useful interactively. */
1060
1061         if ( !winbind_off() ) {
1062                 DEBUG(0,("Failed to disable recusive winbindd calls.  Exiting.\n"));
1063                 exit(1);
1064         }
1065
1066         /* Initialise samba/rpc client stuff */
1067
1068         pc = poptGetContext("winbindd", argc, (const char **)argv, long_options, 0);
1069
1070         while ((opt = poptGetNextOpt(pc)) != -1) {
1071                 switch (opt) {
1072                         /* Don't become a daemon */
1073                 case OPT_DAEMON:
1074                         is_daemon = True;
1075                         break;
1076                 case 'i':
1077                         interactive = True;
1078                         log_stdout = True;
1079                         Fork = False;
1080                         break;
1081                 case OPT_FORK:
1082                         Fork = false;
1083                         break;
1084                 case OPT_NO_PROCESS_GROUP:
1085                         no_process_group = true;
1086                         break;
1087                 case OPT_LOG_STDOUT:
1088                         log_stdout = true;
1089                         break;
1090                 case 'n':
1091                         opt_nocache = true;
1092                         break;
1093                 default:
1094                         d_fprintf(stderr, "\nInvalid option %s: %s\n\n",
1095                                   poptBadOption(pc, 0), poptStrerror(opt));
1096                         poptPrintUsage(pc, stderr, 0);
1097                         exit(1);
1098                 }
1099         }
1100
1101         if (is_daemon && interactive) {
1102                 d_fprintf(stderr,"\nERROR: "
1103                           "Option -i|--interactive is not allowed together with -D|--daemon\n\n");
1104                 poptPrintUsage(pc, stderr, 0);
1105                 exit(1);
1106         }
1107
1108         if (log_stdout && Fork) {
1109                 d_fprintf(stderr, "\nERROR: "
1110                           "Can't log to stdout (-S) unless daemon is in foreground +(-F) or interactive (-i)\n\n");
1111                 poptPrintUsage(pc, stderr, 0);
1112                 exit(1);
1113         }
1114
1115         poptFreeContext(pc);
1116
1117         if (!override_logfile) {
1118                 char *lfile = NULL;
1119                 if (asprintf(&lfile,"%s/log.winbindd",
1120                                 get_dyn_LOGFILEBASE()) > 0) {
1121                         lp_set_logfile(lfile);
1122                         SAFE_FREE(lfile);
1123                 }
1124         }
1125         setup_logging("winbindd", log_stdout);
1126         reopen_logs();
1127
1128         DEBUG(0,("winbindd version %s started.\n", samba_version_string()));
1129         DEBUGADD(0,("%s\n", COPYRIGHT_STARTUP_MESSAGE));
1130
1131         if (!lp_load_initial_only(get_dyn_CONFIGFILE())) {
1132                 DEBUG(0, ("error opening config file\n"));
1133                 exit(1);
1134         }
1135
1136         /* Initialise messaging system */
1137
1138         if (winbind_messaging_context() == NULL) {
1139                 exit(1);
1140         }
1141
1142         if (!reload_services_file(NULL)) {
1143                 DEBUG(0, ("error opening config file\n"));
1144                 exit(1);
1145         }
1146
1147         if (!directory_exist(lp_lockdir())) {
1148                 mkdir(lp_lockdir(), 0755);
1149         }
1150
1151         /* Setup names. */
1152
1153         if (!init_names())
1154                 exit(1);
1155
1156         load_interfaces();
1157
1158         if (!secrets_init()) {
1159
1160                 DEBUG(0,("Could not initialize domain trust account secrets. Giving up\n"));
1161                 return False;
1162         }
1163
1164         /* Enable netbios namecache */
1165
1166         namecache_enable();
1167
1168         /* Unblock all signals we are interested in as they may have been
1169            blocked by the parent process. */
1170
1171         BlockSignals(False, SIGINT);
1172         BlockSignals(False, SIGQUIT);
1173         BlockSignals(False, SIGTERM);
1174         BlockSignals(False, SIGUSR1);
1175         BlockSignals(False, SIGUSR2);
1176         BlockSignals(False, SIGHUP);
1177         BlockSignals(False, SIGCHLD);
1178
1179         if (!interactive)
1180                 become_daemon(Fork, no_process_group, log_stdout);
1181
1182         pidfile_create("winbindd");
1183
1184 #if HAVE_SETPGID
1185         /*
1186          * If we're interactive we want to set our own process group for
1187          * signal management.
1188          */
1189         if (interactive && !no_process_group)
1190                 setpgid( (pid_t)0, (pid_t)0);
1191 #endif
1192
1193         TimeInit();
1194
1195         /* Don't use winbindd_reinit_after_fork here as
1196          * we're just starting up and haven't created any
1197          * winbindd-specific resources we must free yet. JRA.
1198          */
1199
1200         if (!NT_STATUS_IS_OK(reinit_after_fork(winbind_messaging_context(),
1201                                                winbind_event_context(),
1202                                                false))) {
1203                 DEBUG(0,("reinit_after_fork() failed\n"));
1204                 exit(1);
1205         }
1206
1207         /* Setup signal handlers */
1208
1209         if (!winbindd_setup_sig_term_handler(true))
1210                 exit(1);
1211         if (!winbindd_setup_sig_hup_handler(NULL))
1212                 exit(1);
1213         if (!winbindd_setup_sig_chld_handler())
1214                 exit(1);
1215         if (!winbindd_setup_sig_usr2_handler())
1216                 exit(1);
1217
1218         CatchSignal(SIGPIPE, SIG_IGN);                 /* Ignore sigpipe */
1219
1220         /*
1221          * Ensure all cache and idmap caches are consistent
1222          * and initialized before we startup.
1223          */
1224         if (!winbindd_cache_validate_and_initialize()) {
1225                 exit(1);
1226         }
1227
1228         /* get broadcast messages */
1229
1230         if (!serverid_register_self(FLAG_MSG_GENERAL|FLAG_MSG_DBWRAP)) {
1231                 DEBUG(1, ("Could not register myself in serverid.tdb\n"));
1232                 exit(1);
1233         }
1234
1235         /* React on 'smbcontrol winbindd reload-config' in the same way
1236            as to SIGHUP signal */
1237         messaging_register(winbind_messaging_context(), NULL,
1238                            MSG_SMB_CONF_UPDATED, msg_reload_services);
1239         messaging_register(winbind_messaging_context(), NULL,
1240                            MSG_SHUTDOWN, msg_shutdown);
1241
1242         /* Handle online/offline messages. */
1243         messaging_register(winbind_messaging_context(), NULL,
1244                            MSG_WINBIND_OFFLINE, winbind_msg_offline);
1245         messaging_register(winbind_messaging_context(), NULL,
1246                            MSG_WINBIND_ONLINE, winbind_msg_online);
1247         messaging_register(winbind_messaging_context(), NULL,
1248                            MSG_WINBIND_ONLINESTATUS, winbind_msg_onlinestatus);
1249
1250         messaging_register(winbind_messaging_context(), NULL,
1251                            MSG_DUMP_EVENT_LIST, winbind_msg_dump_event_list);
1252
1253         messaging_register(winbind_messaging_context(), NULL,
1254                            MSG_WINBIND_VALIDATE_CACHE,
1255                            winbind_msg_validate_cache);
1256
1257         messaging_register(winbind_messaging_context(), NULL,
1258                            MSG_WINBIND_DUMP_DOMAIN_LIST,
1259                            winbind_msg_dump_domain_list);
1260
1261         /* Register handler for MSG_DEBUG. */
1262         messaging_register(winbind_messaging_context(), NULL,
1263                            MSG_DEBUG,
1264                            winbind_msg_debug);
1265
1266         netsamlogon_cache_init(); /* Non-critical */
1267
1268         /* clear the cached list of trusted domains */
1269
1270         wcache_tdc_clear();
1271
1272         if (!init_domain_list()) {
1273                 DEBUG(0,("unable to initialize domain list\n"));
1274                 exit(1);
1275         }
1276
1277         init_idmap_child();
1278         init_locator_child();
1279
1280         smb_nscd_flush_user_cache();
1281         smb_nscd_flush_group_cache();
1282
1283         /* setup listen sockets */
1284
1285         if (!winbindd_setup_listeners()) {
1286                 DEBUG(0,("winbindd_setup_listeners() failed\n"));
1287                 exit(1);
1288         }
1289
1290         te = tevent_add_timer(winbind_event_context(), NULL, timeval_zero(),
1291                               rescan_trusted_domains, NULL);
1292         if (te == NULL) {
1293                 DEBUG(0, ("Could not trigger rescan_trusted_domains()\n"));
1294                 exit(1);
1295         }
1296
1297         TALLOC_FREE(frame);
1298         /* Loop waiting for requests */
1299         while (1) {
1300                 frame = talloc_stackframe();
1301
1302                 if (tevent_loop_once(winbind_event_context()) == -1) {
1303                         DEBUG(1, ("tevent_loop_once() failed: %s\n",
1304                                   strerror(errno)));
1305                         return 1;
1306                 }
1307
1308                 TALLOC_FREE(frame);
1309         }
1310
1311         return 0;
1312 }