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 #include "librpc/gen_ndr/messaging.h"
  29
  30 #undef DBGC_CLASS
  31 #define DBGC_CLASS DBGC_WINBIND
  32
  33 static void remove_client(struct winbindd_cli_state *state);
  34
  35 static bool opt_nocache = False;
  36 static bool interactive = False;
  37
  38 extern bool override_logfile;
  39
  40 struct event_context *winbind_event_context(void)
  41 {
  42         static struct event_context *ctx;
  43
  44         if (!ctx && !(ctx = event_context_init(NULL))) {
  45                 smb_panic("Could not init winbind event context");
  46         }
  47         return ctx;
  48 }
  49
  50 struct messaging_context *winbind_messaging_context(void)
  51 {
  52         static struct messaging_context *ctx;
  53
  54         if (ctx == NULL) {
  55                 ctx = messaging_init(NULL, procid_self(),
  56                                      winbind_event_context());
  57         }
  58         if (ctx == NULL) {
  59                 DEBUG(0, ("Could not init winbind messaging context.\n"));
  60         }
  61         return ctx;
  62 }
  63
  64 /* Reload configuration */
  65
  66 static bool reload_services_file(const char *lfile)
  67 {
  68         bool ret;
  69
  70         if (lp_loaded()) {
  71                 const char *fname = lp_configfile();
  72
  73                 if (file_exist(fname) && !strcsequal(fname,get_dyn_CONFIGFILE())) {
  74                         set_dyn_CONFIGFILE(fname);
  75                 }
  76         }
  77
  78         /* if this is a child, restore the logfile to the special
  79            name - <domain>, idmap, etc. */
  80         if (lfile && *lfile) {
  81                 lp_set_logfile(lfile);
  82         }
  83
  84         reopen_logs();
  85         ret = lp_load(get_dyn_CONFIGFILE(),False,False,True,True);
  86
  87         reopen_logs();
  88         load_interfaces();
  89
  90         return(ret);
  91 }
  92
  93
  94 /**************************************************************************** **
  95  Handle a fault..
  96  **************************************************************************** */
  97
  98 static void fault_quit(void)
  99 {
 100         dump_core();
 101 }
 102
 103 static void winbindd_status(void)
 104 {
 105         struct winbindd_cli_state *tmp;
 106
 107         DEBUG(0, ("winbindd status:\n"));
 108
 109         /* Print client state information */
 110
 111         DEBUG(0, ("\t%d clients currently active\n", winbindd_num_clients()));
 112
 113         if (DEBUGLEVEL >= 2 && winbindd_num_clients()) {
 114                 DEBUG(2, ("\tclient list:\n"));
 115                 for(tmp = winbindd_client_list(); tmp; tmp = tmp->next) {
 116                         DEBUGADD(2, ("\t\tpid %lu, sock %d\n",
 117                                   (unsigned long)tmp->pid, tmp->sock));
 118                 }
 119         }
 120 }
 121
 122 /* Print winbindd status to log file */
 123
 124 static void print_winbindd_status(void)
 125 {
 126         winbindd_status();
 127 }
 128
 129 /* Flush client cache */
 130
 131 static void flush_caches(void)
 132 {
 133         /* We need to invalidate cached user list entries on a SIGHUP
 134            otherwise cached access denied errors due to restrict anonymous
 135            hang around until the sequence number changes. */
 136
 137         if (!wcache_invalidate_cache()) {
 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 static void flush_caches_noinit(void)
 146 {
 147         /*
 148          * We need to invalidate cached user list entries on a SIGHUP
 149          * otherwise cached access denied errors due to restrict anonymous
 150          * hang around until the sequence number changes.
 151          * NB
 152          * Skip uninitialized domains when flush cache.
 153          * If domain is not initialized, it means it is never
 154          * used or never become online. look, wcache_invalidate_cache()
 155          * -> get_cache() -> init_dc_connection(). It causes a lot of traffic
 156          * for unused domains and large traffic for primay domain's DC if there
 157          * are many domains..
 158          */
 159
 160         if (!wcache_invalidate_cache_noinit()) {
 161                 DEBUG(0, ("invalidating the cache failed; revalidate the cache\n"));
 162                 if (!winbindd_cache_validate_and_initialize()) {
 163                         exit(1);
 164                 }
 165         }
 166 }
 167
 168 /* Handle the signal by unlinking socket and exiting */
 169
 170 static void terminate(bool is_parent)
 171 {
 172         if (is_parent) {
 173                 /* When parent goes away we should
 174                  * remove the socket file. Not so
 175                  * when children terminate.
 176                  */
 177                 char *path = NULL;
 178
 179                 if (asprintf(&path, "%s/%s",
 180                         get_winbind_pipe_dir(), WINBINDD_SOCKET_NAME) > 0) {
 181                         unlink(path);
 182                         SAFE_FREE(path);
 183                 }
 184         }
 185
 186         idmap_close();
 187
 188         trustdom_cache_shutdown();
 189
 190         gencache_stabilize();
 191
 192 #if 0
 193         if (interactive) {
 194                 TALLOC_CTX *mem_ctx = talloc_init("end_description");
 195                 char *description = talloc_describe_all(mem_ctx);
 196
 197                 DEBUG(3, ("tallocs left:\n%s\n", description));
 198                 talloc_destroy(mem_ctx);
 199         }
 200 #endif
 201
 202         if (is_parent) {
 203                 serverid_deregister_self();
 204                 pidfile_unlink();
 205         }
 206
 207         exit(0);
 208 }
 209
 210 static void winbindd_sig_term_handler(struct tevent_context *ev,
 211                                       struct tevent_signal *se,
 212                                       int signum,
 213                                       int count,
 214                                       void *siginfo,
 215                                       void *private_data)
 216 {
 217         bool *is_parent = talloc_get_type_abort(private_data, bool);
 218
 219         DEBUG(0,("Got sig[%d] terminate (is_parent=%d)\n",
 220                  signum, (int)*is_parent));
 221         terminate(*is_parent);
 222 }
 223
 224 bool winbindd_setup_sig_term_handler(bool parent)
 225 {
 226         struct tevent_signal *se;
 227         bool *is_parent;
 228
 229         is_parent = talloc(winbind_event_context(), bool);
 230         if (!is_parent) {
 231                 return false;
 232         }
 233
 234         *is_parent = parent;
 235
 236         se = tevent_add_signal(winbind_event_context(),
 237                                is_parent,
 238                                SIGTERM, 0,
 239                                winbindd_sig_term_handler,
 240                                is_parent);
 241         if (!se) {
 242                 DEBUG(0,("failed to setup SIGTERM handler"));
 243                 talloc_free(is_parent);
 244                 return false;
 245         }
 246
 247         se = tevent_add_signal(winbind_event_context(),
 248                                is_parent,
 249                                SIGINT, 0,
 250                                winbindd_sig_term_handler,
 251                                is_parent);
 252         if (!se) {
 253                 DEBUG(0,("failed to setup SIGINT handler"));
 254                 talloc_free(is_parent);
 255                 return false;
 256         }
 257
 258         se = tevent_add_signal(winbind_event_context(),
 259                                is_parent,
 260                                SIGQUIT, 0,
 261                                winbindd_sig_term_handler,
 262                                is_parent);
 263         if (!se) {
 264                 DEBUG(0,("failed to setup SIGINT handler"));
 265                 talloc_free(is_parent);
 266                 return false;
 267         }
 268
 269         return true;
 270 }
 271
 272 static void winbindd_sig_hup_handler(struct tevent_context *ev,
 273                                      struct tevent_signal *se,
 274                                      int signum,
 275                                      int count,
 276                                      void *siginfo,
 277                                      void *private_data)
 278 {
 279         const char *file = (const char *)private_data;
 280
 281         DEBUG(1,("Reloading services after SIGHUP\n"));
 282         flush_caches_noinit();
 283         reload_services_file(file);
 284 }
 285
 286 bool winbindd_setup_sig_hup_handler(const char *lfile)
 287 {
 288         struct tevent_signal *se;
 289         char *file = NULL;
 290
 291         if (lfile) {
 292                 file = talloc_strdup(winbind_event_context(),
 293                                      lfile);
 294                 if (!file) {
 295                         return false;
 296                 }
 297         }
 298
 299         se = tevent_add_signal(winbind_event_context(),
 300                                winbind_event_context(),
 301                                SIGHUP, 0,
 302                                winbindd_sig_hup_handler,
 303                                file);
 304         if (!se) {
 305                 return false;
 306         }
 307
 308         return true;
 309 }
 310
 311 static void winbindd_sig_chld_handler(struct tevent_context *ev,
 312                                       struct tevent_signal *se,
 313                                       int signum,
 314                                       int count,
 315                                       void *siginfo,
 316                                       void *private_data)
 317 {
 318         pid_t pid;
 319
 320         while ((pid = sys_waitpid(-1, NULL, WNOHANG)) > 0) {
 321                 winbind_child_died(pid);
 322         }
 323 }
 324
 325 static bool winbindd_setup_sig_chld_handler(void)
 326 {
 327         struct tevent_signal *se;
 328
 329         se = tevent_add_signal(winbind_event_context(),
 330                                winbind_event_context(),
 331                                SIGCHLD, 0,
 332                                winbindd_sig_chld_handler,
 333                                NULL);
 334         if (!se) {
 335                 return false;
 336         }
 337
 338         return true;
 339 }
 340
 341 static void winbindd_sig_usr2_handler(struct tevent_context *ev,
 342                                       struct tevent_signal *se,
 343                                       int signum,
 344                                       int count,
 345                                       void *siginfo,
 346                                       void *private_data)
 347 {
 348         print_winbindd_status();
 349 }
 350
 351 static bool winbindd_setup_sig_usr2_handler(void)
 352 {
 353         struct tevent_signal *se;
 354
 355         se = tevent_add_signal(winbind_event_context(),
 356                                winbind_event_context(),
 357                                SIGUSR2, 0,
 358                                winbindd_sig_usr2_handler,
 359                                NULL);
 360         if (!se) {
 361                 return false;
 362         }
 363
 364         return true;
 365 }
 366
 367 /* React on 'smbcontrol winbindd reload-config' in the same way as on SIGHUP*/
 368 static void msg_reload_services(struct messaging_context *msg,
 369                                 void *private_data,
 370                                 uint32_t msg_type,
 371                                 struct server_id server_id,
 372                                 DATA_BLOB *data)
 373 {
 374         /* Flush various caches */
 375         flush_caches();
 376         reload_services_file((const char *) private_data);
 377 }
 378
 379 /* React on 'smbcontrol winbindd shutdown' in the same way as on SIGTERM*/
 380 static void msg_shutdown(struct messaging_context *msg,
 381                          void *private_data,
 382                          uint32_t msg_type,
 383                          struct server_id server_id,
 384                          DATA_BLOB *data)
 385 {
 386         /* only the parent waits for this message */
 387         DEBUG(0,("Got shutdown message\n"));
 388         terminate(true);
 389 }
 390
 391
 392 static void winbind_msg_validate_cache(struct messaging_context *msg_ctx,
 393                                        void *private_data,
 394                                        uint32_t msg_type,
 395                                        struct server_id server_id,
 396                                        DATA_BLOB *data)
 397 {
 398         uint8 ret;
 399         pid_t child_pid;
 400
 401         DEBUG(10, ("winbindd_msg_validate_cache: got validate-cache "
 402                    "message.\n"));
 403
 404         /*
 405          * call the validation code from a child:
 406          * so we don't block the main winbindd and the validation
 407          * code can safely use fork/waitpid...
 408          */
 409         child_pid = sys_fork();
 410
 411         if (child_pid == -1) {
 412                 DEBUG(1, ("winbind_msg_validate_cache: Could not fork: %s\n",
 413                           strerror(errno)));
 414                 return;
 415         }
 416
 417         if (child_pid != 0) {
 418                 /* parent */
 419                 DEBUG(5, ("winbind_msg_validate_cache: child created with "
 420                           "pid %d.\n", (int)child_pid));
 421                 return;
 422         }
 423
 424         /* child */
 425
 426         if (!winbindd_reinit_after_fork(NULL)) {
 427                 _exit(0);
 428         }
 429
 430         /* install default SIGCHLD handler: validation code uses fork/waitpid */
 431         CatchSignal(SIGCHLD, SIG_DFL);
 432
 433         ret = (uint8)winbindd_validate_cache_nobackup();
 434         DEBUG(10, ("winbindd_msg_validata_cache: got return value %d\n", ret));
 435         messaging_send_buf(msg_ctx, server_id, MSG_WINBIND_VALIDATE_CACHE, &ret,
 436                            (size_t)1);
 437         _exit(0);
 438 }
 439
 440 static struct winbindd_dispatch_table {
 441         enum winbindd_cmd cmd;
 442         void (*fn)(struct winbindd_cli_state *state);
 443         const char *winbindd_cmd_name;
 444 } dispatch_table[] = {
 445
 446         /* Enumeration functions */
 447
 448         { WINBINDD_LIST_TRUSTDOM, winbindd_list_trusted_domains,
 449           "LIST_TRUSTDOM" },
 450
 451         /* Miscellaneous */
 452
 453         { WINBINDD_INFO, winbindd_info, "INFO" },
 454         { WINBINDD_INTERFACE_VERSION, winbindd_interface_version,
 455           "INTERFACE_VERSION" },
 456         { WINBINDD_DOMAIN_NAME, winbindd_domain_name, "DOMAIN_NAME" },
 457         { WINBINDD_DOMAIN_INFO, winbindd_domain_info, "DOMAIN_INFO" },
 458         { WINBINDD_NETBIOS_NAME, winbindd_netbios_name, "NETBIOS_NAME" },
 459         { WINBINDD_PRIV_PIPE_DIR, winbindd_priv_pipe_dir,
 460           "WINBINDD_PRIV_PIPE_DIR" },
 461
 462         /* Credential cache access */
 463         { WINBINDD_CCACHE_NTLMAUTH, winbindd_ccache_ntlm_auth, "NTLMAUTH" },
 464         { WINBINDD_CCACHE_SAVE, winbindd_ccache_save, "CCACHE_SAVE" },
 465
 466         /* WINS functions */
 467
 468         { WINBINDD_WINS_BYNAME, winbindd_wins_byname, "WINS_BYNAME" },
 469         { WINBINDD_WINS_BYIP, winbindd_wins_byip, "WINS_BYIP" },
 470
 471         /* End of list */
 472
 473         { WINBINDD_NUM_CMDS, NULL, "NONE" }
 474 };
 475
 476 struct winbindd_async_dispatch_table {
 477         enum winbindd_cmd cmd;
 478         const char *cmd_name;
 479         struct tevent_req *(*send_req)(TALLOC_CTX *mem_ctx,
 480                                        struct tevent_context *ev,
 481                                        struct winbindd_cli_state *cli,
 482                                        struct winbindd_request *request);
 483         NTSTATUS (*recv_req)(struct tevent_req *req,
 484                              struct winbindd_response *presp);
 485 };
 486
 487 static struct winbindd_async_dispatch_table async_nonpriv_table[] = {
 488         { WINBINDD_PING, "PING",
 489           wb_ping_send, wb_ping_recv },
 490         { WINBINDD_LOOKUPSID, "LOOKUPSID",
 491           winbindd_lookupsid_send, winbindd_lookupsid_recv },
 492         { WINBINDD_LOOKUPNAME, "LOOKUPNAME",
 493           winbindd_lookupname_send, winbindd_lookupname_recv },
 494         { WINBINDD_SID_TO_UID, "SID_TO_UID",
 495           winbindd_sid_to_uid_send, winbindd_sid_to_uid_recv },
 496         { WINBINDD_SID_TO_GID, "SID_TO_GID",
 497           winbindd_sid_to_gid_send, winbindd_sid_to_gid_recv },
 498         { WINBINDD_UID_TO_SID, "UID_TO_SID",
 499           winbindd_uid_to_sid_send, winbindd_uid_to_sid_recv },
 500         { WINBINDD_GID_TO_SID, "GID_TO_SID",
 501           winbindd_gid_to_sid_send, winbindd_gid_to_sid_recv },
 502         { WINBINDD_GETPWSID, "GETPWSID",
 503           winbindd_getpwsid_send, winbindd_getpwsid_recv },
 504         { WINBINDD_GETPWNAM, "GETPWNAM",
 505           winbindd_getpwnam_send, winbindd_getpwnam_recv },
 506         { WINBINDD_GETPWUID, "GETPWUID",
 507           winbindd_getpwuid_send, winbindd_getpwuid_recv },
 508         { WINBINDD_GETSIDALIASES, "GETSIDALIASES",
 509           winbindd_getsidaliases_send, winbindd_getsidaliases_recv },
 510         { WINBINDD_GETUSERDOMGROUPS, "GETUSERDOMGROUPS",
 511           winbindd_getuserdomgroups_send, winbindd_getuserdomgroups_recv },
 512         { WINBINDD_GETGROUPS, "GETGROUPS",
 513           winbindd_getgroups_send, winbindd_getgroups_recv },
 514         { WINBINDD_SHOW_SEQUENCE, "SHOW_SEQUENCE",
 515           winbindd_show_sequence_send, winbindd_show_sequence_recv },
 516         { WINBINDD_GETGRGID, "GETGRGID",
 517           winbindd_getgrgid_send, winbindd_getgrgid_recv },
 518         { WINBINDD_GETGRNAM, "GETGRNAM",
 519           winbindd_getgrnam_send, winbindd_getgrnam_recv },
 520         { WINBINDD_GETUSERSIDS, "GETUSERSIDS",
 521           winbindd_getusersids_send, winbindd_getusersids_recv },
 522         { WINBINDD_LOOKUPRIDS, "LOOKUPRIDS",
 523           winbindd_lookuprids_send, winbindd_lookuprids_recv },
 524         { WINBINDD_SETPWENT, "SETPWENT",
 525           winbindd_setpwent_send, winbindd_setpwent_recv },
 526         { WINBINDD_GETPWENT, "GETPWENT",
 527           winbindd_getpwent_send, winbindd_getpwent_recv },
 528         { WINBINDD_ENDPWENT, "ENDPWENT",
 529           winbindd_endpwent_send, winbindd_endpwent_recv },
 530         { WINBINDD_DSGETDCNAME, "DSGETDCNAME",
 531           winbindd_dsgetdcname_send, winbindd_dsgetdcname_recv },
 532         { WINBINDD_GETDCNAME, "GETDCNAME",
 533           winbindd_getdcname_send, winbindd_getdcname_recv },
 534         { WINBINDD_SETGRENT, "SETGRENT",
 535           winbindd_setgrent_send, winbindd_setgrent_recv },
 536         { WINBINDD_GETGRENT, "GETGRENT",
 537           winbindd_getgrent_send, winbindd_getgrent_recv },
 538         { WINBINDD_ENDGRENT, "ENDGRENT",
 539           winbindd_endgrent_send, winbindd_endgrent_recv },
 540         { WINBINDD_LIST_USERS, "LIST_USERS",
 541           winbindd_list_users_send, winbindd_list_users_recv },
 542         { WINBINDD_LIST_GROUPS, "LIST_GROUPS",
 543           winbindd_list_groups_send, winbindd_list_groups_recv },
 544         { WINBINDD_CHECK_MACHACC, "CHECK_MACHACC",
 545           winbindd_check_machine_acct_send, winbindd_check_machine_acct_recv },
 546         { WINBINDD_PING_DC, "PING_DC",
 547           winbindd_ping_dc_send, winbindd_ping_dc_recv },
 548         { WINBINDD_PAM_AUTH, "PAM_AUTH",
 549           winbindd_pam_auth_send, winbindd_pam_auth_recv },
 550         { WINBINDD_PAM_LOGOFF, "PAM_LOGOFF",
 551           winbindd_pam_logoff_send, winbindd_pam_logoff_recv },
 552         { WINBINDD_PAM_CHAUTHTOK, "PAM_CHAUTHTOK",
 553           winbindd_pam_chauthtok_send, winbindd_pam_chauthtok_recv },
 554         { WINBINDD_PAM_CHNG_PSWD_AUTH_CRAP, "PAM_CHNG_PSWD_AUTH_CRAP",
 555           winbindd_pam_chng_pswd_auth_crap_send,
 556           winbindd_pam_chng_pswd_auth_crap_recv },
 557
 558         { 0, NULL, NULL, NULL }
 559 };
 560
 561 static struct winbindd_async_dispatch_table async_priv_table[] = {
 562         { WINBINDD_ALLOCATE_UID, "ALLOCATE_UID",
 563           winbindd_allocate_uid_send, winbindd_allocate_uid_recv },
 564         { WINBINDD_ALLOCATE_GID, "ALLOCATE_GID",
 565           winbindd_allocate_gid_send, winbindd_allocate_gid_recv },
 566         { WINBINDD_SET_MAPPING, "SET_MAPPING",
 567           winbindd_set_mapping_send, winbindd_set_mapping_recv },
 568         { WINBINDD_REMOVE_MAPPING, "SET_MAPPING",
 569           winbindd_remove_mapping_send, winbindd_remove_mapping_recv },
 570         { WINBINDD_SET_HWM, "SET_HWM",
 571           winbindd_set_hwm_send, winbindd_set_hwm_recv },
 572         { WINBINDD_CHANGE_MACHACC, "CHANGE_MACHACC",
 573           winbindd_change_machine_acct_send, winbindd_change_machine_acct_recv },
 574         { WINBINDD_PAM_AUTH_CRAP, "PAM_AUTH_CRAP",
 575           winbindd_pam_auth_crap_send, winbindd_pam_auth_crap_recv },
 576
 577         { 0, NULL, NULL, NULL }
 578 };
 579
 580 static void wb_request_done(struct tevent_req *req);
 581
 582 static void process_request(struct winbindd_cli_state *state)
 583 {
 584         struct winbindd_dispatch_table *table = dispatch_table;
 585         struct winbindd_async_dispatch_table *atable;
 586
 587         state->mem_ctx = talloc_init("winbind request");
 588         if (state->mem_ctx == NULL)
 589                 return;
 590
 591         /* Remember who asked us. */
 592         state->pid = state->request->pid;
 593
 594         state->cmd_name = "unknown request";
 595         state->recv_fn = NULL;
 596
 597         /* Process command */
 598
 599         for (atable = async_nonpriv_table; atable->send_req; atable += 1) {
 600                 if (state->request->cmd == atable->cmd) {
 601                         break;
 602                 }
 603         }
 604
 605         if ((atable->send_req == NULL) && state->privileged) {
 606                 for (atable = async_priv_table; atable->send_req;
 607                      atable += 1) {
 608                         if (state->request->cmd == atable->cmd) {
 609                                 break;
 610                         }
 611                 }
 612         }
 613
 614         if (atable->send_req != NULL) {
 615                 struct tevent_req *req;
 616
 617                 state->cmd_name = atable->cmd_name;
 618                 state->recv_fn = atable->recv_req;
 619
 620                 DEBUG(10, ("process_request: Handling async request %d:%s\n",
 621                            (int)state->pid, state->cmd_name));
 622
 623                 req = atable->send_req(state->mem_ctx, winbind_event_context(),
 624                                        state, state->request);
 625                 if (req == NULL) {
 626                         DEBUG(0, ("process_request: atable->send failed for "
 627                                   "%s\n", atable->cmd_name));
 628                         request_error(state);
 629                         return;
 630                 }
 631                 tevent_req_set_callback(req, wb_request_done, state);
 632                 return;
 633         }
 634
 635         state->response = talloc_zero(state->mem_ctx,
 636                                       struct winbindd_response);
 637         if (state->response == NULL) {
 638                 DEBUG(10, ("talloc failed\n"));
 639                 remove_client(state);
 640                 return;
 641         }
 642         state->response->result = WINBINDD_PENDING;
 643         state->response->length = sizeof(struct winbindd_response);
 644
 645         for (table = dispatch_table; table->fn; table++) {
 646                 if (state->request->cmd == table->cmd) {
 647                         DEBUG(10,("process_request: request fn %s\n",
 648                                   table->winbindd_cmd_name ));
 649                         state->cmd_name = table->winbindd_cmd_name;
 650                         table->fn(state);
 651                         break;
 652                 }
 653         }
 654
 655         if (!table->fn) {
 656                 DEBUG(10,("process_request: unknown request fn number %d\n",
 657                           (int)state->request->cmd ));
 658                 request_error(state);
 659         }
 660 }
 661
 662 static void wb_request_done(struct tevent_req *req)
 663 {
 664         struct winbindd_cli_state *state = tevent_req_callback_data(
 665                 req, struct winbindd_cli_state);
 666         NTSTATUS status;
 667
 668         state->response = talloc_zero(state->mem_ctx,
 669                                       struct winbindd_response);
 670         if (state->response == NULL) {
 671                 DEBUG(0, ("wb_request_done[%d:%s]: talloc_zero failed - removing client\n",
 672                           (int)state->pid, state->cmd_name));
 673                 remove_client(state);
 674                 return;
 675         }
 676         state->response->result = WINBINDD_PENDING;
 677         state->response->length = sizeof(struct winbindd_response);
 678
 679         status = state->recv_fn(req, state->response);
 680         TALLOC_FREE(req);
 681
 682         DEBUG(10,("wb_request_done[%d:%s]: %s\n",
 683                   (int)state->pid, state->cmd_name, nt_errstr(status)));
 684
 685         if (!NT_STATUS_IS_OK(status)) {
 686                 request_error(state);
 687                 return;
 688         }
 689         request_ok(state);
 690 }
 691
 692 /*
 693  * This is the main event loop of winbind requests. It goes through a
 694  * state-machine of 3 read/write requests, 4 if you have extra data to send.
 695  *
 696  * An idle winbind client has a read request of 4 bytes outstanding,
 697  * finalizing function is request_len_recv, checking the length. request_recv
 698  * then processes the packet. The processing function then at some point has
 699  * to call request_finished which schedules sending the response.
 700  */
 701
 702 static void request_finished(struct winbindd_cli_state *state);
 703
 704 static void winbind_client_request_read(struct tevent_req *req);
 705 static void winbind_client_response_written(struct tevent_req *req);
 706
 707 static void request_finished(struct winbindd_cli_state *state)
 708 {
 709         struct tevent_req *req;
 710
 711         TALLOC_FREE(state->request);
 712
 713         req = wb_resp_write_send(state, winbind_event_context(),
 714                                  state->out_queue, state->sock,
 715                                  state->response);
 716         if (req == NULL) {
 717                 DEBUG(10,("request_finished[%d:%s]: wb_resp_write_send() failed\n",
 718                           (int)state->pid, state->cmd_name));
 719                 remove_client(state);
 720                 return;
 721         }
 722         tevent_req_set_callback(req, winbind_client_response_written, state);
 723 }
 724
 725 static void winbind_client_response_written(struct tevent_req *req)
 726 {
 727         struct winbindd_cli_state *state = tevent_req_callback_data(
 728                 req, struct winbindd_cli_state);
 729         ssize_t ret;
 730         int err;
 731
 732         ret = wb_resp_write_recv(req, &err);
 733         TALLOC_FREE(req);
 734         if (ret == -1) {
 735                 close(state->sock);
 736                 state->sock = -1;
 737                 DEBUG(2, ("Could not write response[%d:%s] to client: %s\n",
 738                           (int)state->pid, state->cmd_name, strerror(err)));
 739                 remove_client(state);
 740                 return;
 741         }
 742
 743         DEBUG(10,("winbind_client_response_written[%d:%s]: delivered response "
 744                   "to client\n", (int)state->pid, state->cmd_name));
 745
 746         TALLOC_FREE(state->mem_ctx);
 747         state->response = NULL;
 748         state->cmd_name = "no request";
 749         state->recv_fn = NULL;
 750
 751         req = wb_req_read_send(state, winbind_event_context(), state->sock,
 752                                WINBINDD_MAX_EXTRA_DATA);
 753         if (req == NULL) {
 754                 remove_client(state);
 755                 return;
 756         }
 757         tevent_req_set_callback(req, winbind_client_request_read, state);
 758 }
 759
 760 void request_error(struct winbindd_cli_state *state)
 761 {
 762         SMB_ASSERT(state->response->result == WINBINDD_PENDING);
 763         state->response->result = WINBINDD_ERROR;
 764         request_finished(state);
 765 }
 766
 767 void request_ok(struct winbindd_cli_state *state)
 768 {
 769         SMB_ASSERT(state->response->result == WINBINDD_PENDING);
 770         state->response->result = WINBINDD_OK;
 771         request_finished(state);
 772 }
 773
 774 /* Process a new connection by adding it to the client connection list */
 775
 776 static void new_connection(int listen_sock, bool privileged)
 777 {
 778         struct sockaddr_un sunaddr;
 779         struct winbindd_cli_state *state;
 780         struct tevent_req *req;
 781         socklen_t len;
 782         int sock;
 783
 784         /* Accept connection */
 785
 786         len = sizeof(sunaddr);
 787
 788         do {
 789                 sock = accept(listen_sock, (struct sockaddr *)(void *)&sunaddr,
 790                               &len);
 791         } while (sock == -1 && errno == EINTR);
 792
 793         if (sock == -1)
 794                 return;
 795
 796         DEBUG(6,("accepted socket %d\n", sock));
 797
 798         /* Create new connection structure */
 799
 800         if ((state = TALLOC_ZERO_P(NULL, struct winbindd_cli_state)) == NULL) {
 801                 close(sock);
 802                 return;
 803         }
 804
 805         state->sock = sock;
 806
 807         state->out_queue = tevent_queue_create(state, "winbind client reply");
 808         if (state->out_queue == NULL) {
 809                 close(sock);
 810                 TALLOC_FREE(state);
 811                 return;
 812         }
 813
 814         state->last_access = time(NULL);
 815
 816         state->privileged = privileged;
 817
 818         req = wb_req_read_send(state, winbind_event_context(), state->sock,
 819                                WINBINDD_MAX_EXTRA_DATA);
 820         if (req == NULL) {
 821                 TALLOC_FREE(state);
 822                 close(sock);
 823                 return;
 824         }
 825         tevent_req_set_callback(req, winbind_client_request_read, state);
 826
 827         /* Add to connection list */
 828
 829         winbindd_add_client(state);
 830 }
 831
 832 static void winbind_client_request_read(struct tevent_req *req)
 833 {
 834         struct winbindd_cli_state *state = tevent_req_callback_data(
 835                 req, struct winbindd_cli_state);
 836         ssize_t ret;
 837         int err;
 838
 839         ret = wb_req_read_recv(req, state, &state->request, &err);
 840         TALLOC_FREE(req);
 841         if (ret == -1) {
 842                 if (err == EPIPE) {
 843                         DEBUG(6, ("closing socket %d, client exited\n",
 844                                   state->sock));
 845                 } else {
 846                         DEBUG(2, ("Could not read client request from fd %d: "
 847                                   "%s\n", state->sock, strerror(err)));
 848                 }
 849                 close(state->sock);
 850                 state->sock = -1;
 851                 remove_client(state);
 852                 return;
 853         }
 854         process_request(state);
 855 }
 856
 857 /* Remove a client connection from client connection list */
 858
 859 static void remove_client(struct winbindd_cli_state *state)
 860 {
 861         char c = 0;
 862         int nwritten;
 863
 864         /* It's a dead client - hold a funeral */
 865
 866         if (state == NULL) {
 867                 return;
 868         }
 869
 870         if (state->sock != -1) {
 871                 /* tell client, we are closing ... */
 872                 nwritten = write(state->sock, &c, sizeof(c));
 873                 if (nwritten == -1) {
 874                         DEBUG(2, ("final write to client failed: %s\n",
 875                                 strerror(errno)));
 876                 }
 877
 878                 /* Close socket */
 879
 880                 close(state->sock);
 881                 state->sock = -1;
 882         }
 883
 884         TALLOC_FREE(state->mem_ctx);
 885
 886         /* Remove from list and free */
 887
 888         winbindd_remove_client(state);
 889         TALLOC_FREE(state);
 890 }
 891
 892 /* Shutdown client connection which has been idle for the longest time */
 893
 894 static bool remove_idle_client(void)
 895 {
 896         struct winbindd_cli_state *state, *remove_state = NULL;
 897         time_t last_access = 0;
 898         int nidle = 0;
 899
 900         for (state = winbindd_client_list(); state; state = state->next) {
 901                 if (state->response == NULL &&
 902                     !state->pwent_state && !state->grent_state) {
 903                         nidle++;
 904                         if (!last_access || state->last_access < last_access) {
 905                                 last_access = state->last_access;
 906                                 remove_state = state;
 907                         }
 908                 }
 909         }
 910
 911         if (remove_state) {
 912                 DEBUG(5,("Found %d idle client connections, shutting down sock %d, pid %u\n",
 913                         nidle, remove_state->sock, (unsigned int)remove_state->pid));
 914                 remove_client(remove_state);
 915                 return True;
 916         }
 917
 918         return False;
 919 }
 920
 921 struct winbindd_listen_state {
 922         bool privileged;
 923         int fd;
 924 };
 925
 926 static void winbindd_listen_fde_handler(struct tevent_context *ev,
 927                                         struct tevent_fd *fde,
 928                                         uint16_t flags,
 929                                         void *private_data)
 930 {
 931         struct winbindd_listen_state *s = talloc_get_type_abort(private_data,
 932                                           struct winbindd_listen_state);
 933
 934         while (winbindd_num_clients() >
 935                WINBINDD_MAX_SIMULTANEOUS_CLIENTS - 1) {
 936                 DEBUG(5,("winbindd: Exceeding %d client "
 937                          "connections, removing idle "
 938                          "connection.\n",
 939                          WINBINDD_MAX_SIMULTANEOUS_CLIENTS));
 940                 if (!remove_idle_client()) {
 941                         DEBUG(0,("winbindd: Exceeding %d "
 942                                  "client connections, no idle "
 943                                  "connection found\n",
 944                                  WINBINDD_MAX_SIMULTANEOUS_CLIENTS));
 945                         break;
 946                 }
 947         }
 948         new_connection(s->fd, s->privileged);
 949 }
 950
 951 static bool winbindd_setup_listeners(void)
 952 {
 953         struct winbindd_listen_state *pub_state = NULL;
 954         struct winbindd_listen_state *priv_state = NULL;
 955         struct tevent_fd *fde;
 956
 957         pub_state = talloc(winbind_event_context(),
 958                            struct winbindd_listen_state);
 959         if (!pub_state) {
 960                 goto failed;
 961         }
 962
 963         pub_state->privileged = false;
 964         pub_state->fd = open_winbindd_socket();
 965         if (pub_state->fd == -1) {
 966                 goto failed;
 967         }
 968
 969         fde = tevent_add_fd(winbind_event_context(), pub_state, pub_state->fd,
 970                             TEVENT_FD_READ, winbindd_listen_fde_handler,
 971                             pub_state);
 972         if (fde == NULL) {
 973                 close(pub_state->fd);
 974                 goto failed;
 975         }
 976         tevent_fd_set_auto_close(fde);
 977
 978         priv_state = talloc(winbind_event_context(),
 979                             struct winbindd_listen_state);
 980         if (!priv_state) {
 981                 goto failed;
 982         }
 983
 984         priv_state->privileged = true;
 985         priv_state->fd = open_winbindd_priv_socket();
 986         if (priv_state->fd == -1) {
 987                 goto failed;
 988         }
 989
 990         fde = tevent_add_fd(winbind_event_context(), priv_state,
 991                             priv_state->fd, TEVENT_FD_READ,
 992                             winbindd_listen_fde_handler, priv_state);
 993         if (fde == NULL) {
 994                 close(priv_state->fd);
 995                 goto failed;
 996         }
 997         tevent_fd_set_auto_close(fde);
 998
 999         return true;
1000 failed:
1001         TALLOC_FREE(pub_state);
1002         TALLOC_FREE(priv_state);
1003         return false;
1004 }
1005
1006 bool winbindd_use_idmap_cache(void)
1007 {
1008         return !opt_nocache;
1009 }
1010
1011 bool winbindd_use_cache(void)
1012 {
1013         return !opt_nocache;
1014 }
1015
1016 /* Main function */
1017
1018 int main(int argc, char **argv, char **envp)
1019 {
1020         static bool is_daemon = False;
1021         static bool Fork = True;
1022         static bool log_stdout = False;
1023         static bool no_process_group = False;
1024         enum {
1025                 OPT_DAEMON = 1000,
1026                 OPT_FORK,
1027                 OPT_NO_PROCESS_GROUP,
1028                 OPT_LOG_STDOUT
1029         };
1030         struct poptOption long_options[] = {
1031                 POPT_AUTOHELP
1032                 { "stdout", 'S', POPT_ARG_NONE, NULL, OPT_LOG_STDOUT, "Log to stdout" },
1033                 { "foreground", 'F', POPT_ARG_NONE, NULL, OPT_FORK, "Daemon in foreground mode" },
1034                 { "no-process-group", 0, POPT_ARG_NONE, NULL, OPT_NO_PROCESS_GROUP, "Don't create a new process group" },
1035                 { "daemon", 'D', POPT_ARG_NONE, NULL, OPT_DAEMON, "Become a daemon (default)" },
1036                 { "interactive", 'i', POPT_ARG_NONE, NULL, 'i', "Interactive mode" },
1037                 { "no-caching", 'n', POPT_ARG_NONE, NULL, 'n', "Disable caching" },
1038                 POPT_COMMON_SAMBA
1039                 POPT_TABLEEND
1040         };
1041         poptContext pc;
1042         int opt;
1043         TALLOC_CTX *frame = talloc_stackframe();
1044         struct tevent_timer *te;
1045
1046         /* glibc (?) likes to print "User defined signal 1" and exit if a
1047            SIGUSR[12] is received before a handler is installed */
1048
1049         CatchSignal(SIGUSR1, SIG_IGN);
1050         CatchSignal(SIGUSR2, SIG_IGN);
1051
1052         fault_setup((void (*)(void *))fault_quit );
1053         dump_core_setup("winbindd");
1054
1055         load_case_tables();
1056
1057         /* Initialise for running in non-root mode */
1058
1059         sec_init();
1060
1061         set_remote_machine_name("winbindd", False);
1062
1063         /* Set environment variable so we don't recursively call ourselves.
1064            This may also be useful interactively. */
1065
1066         if ( !winbind_off() ) {
1067                 DEBUG(0,("Failed to disable recusive winbindd calls.  Exiting.\n"));
1068                 exit(1);
1069         }
1070
1071         /* Initialise samba/rpc client stuff */
1072
1073         pc = poptGetContext("winbindd", argc, (const char **)argv, long_options, 0);
1074
1075         while ((opt = poptGetNextOpt(pc)) != -1) {
1076                 switch (opt) {
1077                         /* Don't become a daemon */
1078                 case OPT_DAEMON:
1079                         is_daemon = True;
1080                         break;
1081                 case 'i':
1082                         interactive = True;
1083                         log_stdout = True;
1084                         Fork = False;
1085                         break;
1086                 case OPT_FORK:
1087                         Fork = false;
1088                         break;
1089                 case OPT_NO_PROCESS_GROUP:
1090                         no_process_group = true;
1091                         break;
1092                 case OPT_LOG_STDOUT:
1093                         log_stdout = true;
1094                         break;
1095                 case 'n':
1096                         opt_nocache = true;
1097                         break;
1098                 default:
1099                         d_fprintf(stderr, "\nInvalid option %s: %s\n\n",
1100                                   poptBadOption(pc, 0), poptStrerror(opt));
1101                         poptPrintUsage(pc, stderr, 0);
1102                         exit(1);
1103                 }
1104         }
1105
1106         if (is_daemon && interactive) {
1107                 d_fprintf(stderr,"\nERROR: "
1108                           "Option -i|--interactive is not allowed together with -D|--daemon\n\n");
1109                 poptPrintUsage(pc, stderr, 0);
1110                 exit(1);
1111         }
1112
1113         if (log_stdout && Fork) {
1114                 d_fprintf(stderr, "\nERROR: "
1115                           "Can't log to stdout (-S) unless daemon is in foreground +(-F) or interactive (-i)\n\n");
1116                 poptPrintUsage(pc, stderr, 0);
1117                 exit(1);
1118         }
1119
1120         poptFreeContext(pc);
1121
1122         if (!override_logfile) {
1123                 char *lfile = NULL;
1124                 if (asprintf(&lfile,"%s/log.winbindd",
1125                                 get_dyn_LOGFILEBASE()) > 0) {
1126                         lp_set_logfile(lfile);
1127                         SAFE_FREE(lfile);
1128                 }
1129         }
1130         setup_logging("winbindd", log_stdout);
1131         reopen_logs();
1132
1133         DEBUG(0,("winbindd version %s started.\n", samba_version_string()));
1134         DEBUGADD(0,("%s\n", COPYRIGHT_STARTUP_MESSAGE));
1135
1136         if (!lp_load_initial_only(get_dyn_CONFIGFILE())) {
1137                 DEBUG(0, ("error opening config file\n"));
1138                 exit(1);
1139         }
1140
1141         /* Initialise messaging system */
1142
1143         if (winbind_messaging_context() == NULL) {
1144                 exit(1);
1145         }
1146
1147         if (!reload_services_file(NULL)) {
1148                 DEBUG(0, ("error opening config file\n"));
1149                 exit(1);
1150         }
1151
1152         if (!directory_exist(lp_lockdir())) {
1153                 mkdir(lp_lockdir(), 0755);
1154         }
1155
1156         /* Setup names. */
1157
1158         if (!init_names())
1159                 exit(1);
1160
1161         load_interfaces();
1162
1163         if (!secrets_init()) {
1164
1165                 DEBUG(0,("Could not initialize domain trust account secrets. Giving up\n"));
1166                 return False;
1167         }
1168
1169         /* Unblock all signals we are interested in as they may have been
1170            blocked by the parent process. */
1171
1172         BlockSignals(False, SIGINT);
1173         BlockSignals(False, SIGQUIT);
1174         BlockSignals(False, SIGTERM);
1175         BlockSignals(False, SIGUSR1);
1176         BlockSignals(False, SIGUSR2);
1177         BlockSignals(False, SIGHUP);
1178         BlockSignals(False, SIGCHLD);
1179
1180         if (!interactive)
1181                 become_daemon(Fork, no_process_group, log_stdout);
1182
1183         pidfile_create("winbindd");
1184
1185 #if HAVE_SETPGID
1186         /*
1187          * If we're interactive we want to set our own process group for
1188          * signal management.
1189          */
1190         if (interactive && !no_process_group)
1191                 setpgid( (pid_t)0, (pid_t)0);
1192 #endif
1193
1194         TimeInit();
1195
1196         /* Don't use winbindd_reinit_after_fork here as
1197          * we're just starting up and haven't created any
1198          * winbindd-specific resources we must free yet. JRA.
1199          */
1200
1201         if (!NT_STATUS_IS_OK(reinit_after_fork(winbind_messaging_context(),
1202                                                winbind_event_context(),
1203                                                false))) {
1204                 DEBUG(0,("reinit_after_fork() failed\n"));
1205                 exit(1);
1206         }
1207
1208         /* Setup signal handlers */
1209
1210         if (!winbindd_setup_sig_term_handler(true))
1211                 exit(1);
1212         if (!winbindd_setup_sig_hup_handler(NULL))
1213                 exit(1);
1214         if (!winbindd_setup_sig_chld_handler())
1215                 exit(1);
1216         if (!winbindd_setup_sig_usr2_handler())
1217                 exit(1);
1218
1219         CatchSignal(SIGPIPE, SIG_IGN);                 /* Ignore sigpipe */
1220
1221         /*
1222          * Ensure all cache and idmap caches are consistent
1223          * and initialized before we startup.
1224          */
1225         if (!winbindd_cache_validate_and_initialize()) {
1226                 exit(1);
1227         }
1228
1229         /* get broadcast messages */
1230
1231         if (!serverid_register_self(FLAG_MSG_GENERAL|FLAG_MSG_DBWRAP)) {
1232                 DEBUG(1, ("Could not register myself in serverid.tdb\n"));
1233                 exit(1);
1234         }
1235
1236         /* React on 'smbcontrol winbindd reload-config' in the same way
1237            as to SIGHUP signal */
1238         messaging_register(winbind_messaging_context(), NULL,
1239                            MSG_SMB_CONF_UPDATED, msg_reload_services);
1240         messaging_register(winbind_messaging_context(), NULL,
1241                            MSG_SHUTDOWN, msg_shutdown);
1242
1243         /* Handle online/offline messages. */
1244         messaging_register(winbind_messaging_context(), NULL,
1245                            MSG_WINBIND_OFFLINE, winbind_msg_offline);
1246         messaging_register(winbind_messaging_context(), NULL,
1247                            MSG_WINBIND_ONLINE, winbind_msg_online);
1248         messaging_register(winbind_messaging_context(), NULL,
1249                            MSG_WINBIND_ONLINESTATUS, winbind_msg_onlinestatus);
1250
1251         messaging_register(winbind_messaging_context(), NULL,
1252                            MSG_DUMP_EVENT_LIST, winbind_msg_dump_event_list);
1253
1254         messaging_register(winbind_messaging_context(), NULL,
1255                            MSG_WINBIND_VALIDATE_CACHE,
1256                            winbind_msg_validate_cache);
1257
1258         messaging_register(winbind_messaging_context(), NULL,
1259                            MSG_WINBIND_DUMP_DOMAIN_LIST,
1260                            winbind_msg_dump_domain_list);
1261
1262         /* Register handler for MSG_DEBUG. */
1263         messaging_register(winbind_messaging_context(), NULL,
1264                            MSG_DEBUG,
1265                            winbind_msg_debug);
1266
1267         netsamlogon_cache_init(); /* Non-critical */
1268
1269         /* clear the cached list of trusted domains */
1270
1271         wcache_tdc_clear();
1272
1273         if (!init_domain_list()) {
1274                 DEBUG(0,("unable to initialize domain list\n"));
1275                 exit(1);
1276         }
1277
1278         init_idmap_child();
1279         init_locator_child();
1280
1281         smb_nscd_flush_user_cache();
1282         smb_nscd_flush_group_cache();
1283
1284         /* setup listen sockets */
1285
1286         if (!winbindd_setup_listeners()) {
1287                 DEBUG(0,("winbindd_setup_listeners() failed\n"));
1288                 exit(1);
1289         }
1290
1291         te = tevent_add_timer(winbind_event_context(), NULL, timeval_zero(),
1292                               rescan_trusted_domains, NULL);
1293         if (te == NULL) {
1294                 DEBUG(0, ("Could not trigger rescan_trusted_domains()\n"));
1295                 exit(1);
1296         }
1297
1298         TALLOC_FREE(frame);
1299         /* Loop waiting for requests */
1300         while (1) {
1301                 frame = talloc_stackframe();
1302
1303                 if (tevent_loop_once(winbind_event_context()) == -1) {
1304                         DEBUG(1, ("tevent_loop_once() failed: %s\n",
1305                                   strerror(errno)));
1306                         return 1;
1307                 }
1308
1309                 TALLOC_FREE(frame);
1310         }
1311
1312         return 0;
1313 }