source3/winbindd/winbindd.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3
   4    Winbind daemon for ntdom nss module
   5
   6    Copyright (C) by Tim Potter 2000-2002
   7    Copyright (C) Andrew Tridgell 2002
   8    Copyright (C) Jelmer Vernooij 2003
   9    Copyright (C) Volker Lendecke 2004
  10
  11    This program is free software; you can redistribute it and/or modify
  12    it under the terms of the GNU General Public License as published by
  13    the Free Software Foundation; either version 3 of the License, or
  14    (at your option) any later version.
  15
  16    This program is distributed in the hope that it will be useful,
  17    but WITHOUT ANY WARRANTY; without even the implied warranty of
  18    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19    GNU General Public License for more details.
  20
  21    You should have received a copy of the GNU General Public License
  22    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  23 */
  24
  25 #include "includes.h"
  26 #include "popt_common.h"
  27 #include "winbindd.h"
  28 #include "../../nsswitch/libwbclient/wbc_async.h"
  29 #include "librpc/gen_ndr/messaging.h"
  30 #include "../librpc/gen_ndr/srv_lsa.h"
  31 #include "../librpc/gen_ndr/srv_samr.h"
  32 #include "secrets.h"
  33
  34 #undef DBGC_CLASS
  35 #define DBGC_CLASS DBGC_WINBIND
  36
  37 static void remove_client(struct winbindd_cli_state *state);
  38
  39 static bool opt_nocache = False;
  40 static bool interactive = False;
  41
  42 extern bool override_logfile;
  43
  44 /* Reload configuration */
  45
  46 static bool reload_services_file(const char *lfile)
  47 {
  48         bool ret;
  49
  50         if (lp_loaded()) {
  51                 const char *fname = lp_configfile();
  52
  53                 if (file_exist(fname) && !strcsequal(fname,get_dyn_CONFIGFILE())) {
  54                         set_dyn_CONFIGFILE(fname);
  55                 }
  56         }
  57
  58         /* if this is a child, restore the logfile to the special
  59            name - <domain>, idmap, etc. */
  60         if (lfile && *lfile) {
  61                 lp_set_logfile(lfile);
  62         }
  63
  64         reopen_logs();
  65         ret = lp_load(get_dyn_CONFIGFILE(),False,False,True,True);
  66
  67         reopen_logs();
  68         load_interfaces();
  69
  70         return(ret);
  71 }
  72
  73
  74 /**************************************************************************** **
  75  Handle a fault..
  76  **************************************************************************** */
  77
  78 static void fault_quit(void)
  79 {
  80         dump_core();
  81 }
  82
  83 static void winbindd_status(void)
  84 {
  85         struct winbindd_cli_state *tmp;
  86
  87         DEBUG(0, ("winbindd status:\n"));
  88
  89         /* Print client state information */
  90
  91         DEBUG(0, ("\t%d clients currently active\n", winbindd_num_clients()));
  92
  93         if (DEBUGLEVEL >= 2 && winbindd_num_clients()) {
  94                 DEBUG(2, ("\tclient list:\n"));
  95                 for(tmp = winbindd_client_list(); tmp; tmp = tmp->next) {
  96                         DEBUGADD(2, ("\t\tpid %lu, sock %d\n",
  97                                   (unsigned long)tmp->pid, tmp->sock));
  98                 }
  99         }
 100 }
 101
 102 /* Print winbindd status to log file */
 103
 104 static void print_winbindd_status(void)
 105 {
 106         winbindd_status();
 107 }
 108
 109 /* Flush client cache */
 110
 111 static void flush_caches(void)
 112 {
 113         /* We need to invalidate cached user list entries on a SIGHUP
 114            otherwise cached access denied errors due to restrict anonymous
 115            hang around until the sequence number changes. */
 116
 117         if (!wcache_invalidate_cache()) {
 118                 DEBUG(0, ("invalidating the cache failed; revalidate the cache\n"));
 119                 if (!winbindd_cache_validate_and_initialize()) {
 120                         exit(1);
 121                 }
 122         }
 123 }
 124
 125 static void flush_caches_noinit(void)
 126 {
 127         /*
 128          * We need to invalidate cached user list entries on a SIGHUP
 129          * otherwise cached access denied errors due to restrict anonymous
 130          * hang around until the sequence number changes.
 131          * NB
 132          * Skip uninitialized domains when flush cache.
 133          * If domain is not initialized, it means it is never
 134          * used or never become online. look, wcache_invalidate_cache()
 135          * -> get_cache() -> init_dc_connection(). It causes a lot of traffic
 136          * for unused domains and large traffic for primay domain's DC if there
 137          * are many domains..
 138          */
 139
 140         if (!wcache_invalidate_cache_noinit()) {
 141                 DEBUG(0, ("invalidating the cache failed; revalidate the cache\n"));
 142                 if (!winbindd_cache_validate_and_initialize()) {
 143                         exit(1);
 144                 }
 145         }
 146 }
 147
 148 /* Handle the signal by unlinking socket and exiting */
 149
 150 static void terminate(bool is_parent)
 151 {
 152         if (is_parent) {
 153                 /* When parent goes away we should
 154                  * remove the socket file. Not so
 155                  * when children terminate.
 156                  */
 157                 char *path = NULL;
 158
 159                 if (asprintf(&path, "%s/%s",
 160                         get_winbind_pipe_dir(), WINBINDD_SOCKET_NAME) > 0) {
 161                         unlink(path);
 162                         SAFE_FREE(path);
 163                 }
 164         }
 165
 166         idmap_close();
 167
 168         trustdom_cache_shutdown();
 169
 170         gencache_stabilize();
 171
 172 #if 0
 173         if (interactive) {
 174                 TALLOC_CTX *mem_ctx = talloc_init("end_description");
 175                 char *description = talloc_describe_all(mem_ctx);
 176
 177                 DEBUG(3, ("tallocs left:\n%s\n", description));
 178                 talloc_destroy(mem_ctx);
 179         }
 180 #endif
 181
 182         if (is_parent) {
 183                 serverid_deregister(procid_self());
 184                 pidfile_unlink();
 185         }
 186
 187         exit(0);
 188 }
 189
 190 static void winbindd_sig_term_handler(struct tevent_context *ev,
 191                                       struct tevent_signal *se,
 192                                       int signum,
 193                                       int count,
 194                                       void *siginfo,
 195                                       void *private_data)
 196 {
 197         bool *is_parent = talloc_get_type_abort(private_data, bool);
 198
 199         DEBUG(0,("Got sig[%d] terminate (is_parent=%d)\n",
 200                  signum, (int)*is_parent));
 201         terminate(*is_parent);
 202 }
 203
 204 bool winbindd_setup_sig_term_handler(bool parent)
 205 {
 206         struct tevent_signal *se;
 207         bool *is_parent;
 208
 209         is_parent = talloc(winbind_event_context(), bool);
 210         if (!is_parent) {
 211                 return false;
 212         }
 213
 214         *is_parent = parent;
 215
 216         se = tevent_add_signal(winbind_event_context(),
 217                                is_parent,
 218                                SIGTERM, 0,
 219                                winbindd_sig_term_handler,
 220                                is_parent);
 221         if (!se) {
 222                 DEBUG(0,("failed to setup SIGTERM handler"));
 223                 talloc_free(is_parent);
 224                 return false;
 225         }
 226
 227         se = tevent_add_signal(winbind_event_context(),
 228                                is_parent,
 229                                SIGINT, 0,
 230                                winbindd_sig_term_handler,
 231                                is_parent);
 232         if (!se) {
 233                 DEBUG(0,("failed to setup SIGINT handler"));
 234                 talloc_free(is_parent);
 235                 return false;
 236         }
 237
 238         se = tevent_add_signal(winbind_event_context(),
 239                                is_parent,
 240                                SIGQUIT, 0,
 241                                winbindd_sig_term_handler,
 242                                is_parent);
 243         if (!se) {
 244                 DEBUG(0,("failed to setup SIGINT handler"));
 245                 talloc_free(is_parent);
 246                 return false;
 247         }
 248
 249         return true;
 250 }
 251
 252 static void winbindd_sig_hup_handler(struct tevent_context *ev,
 253                                      struct tevent_signal *se,
 254                                      int signum,
 255                                      int count,
 256                                      void *siginfo,
 257                                      void *private_data)
 258 {
 259         const char *file = (const char *)private_data;
 260
 261         DEBUG(1,("Reloading services after SIGHUP\n"));
 262         flush_caches_noinit();
 263         reload_services_file(file);
 264 }
 265
 266 bool winbindd_setup_sig_hup_handler(const char *lfile)
 267 {
 268         struct tevent_signal *se;
 269         char *file = NULL;
 270
 271         if (lfile) {
 272                 file = talloc_strdup(winbind_event_context(),
 273                                      lfile);
 274                 if (!file) {
 275                         return false;
 276                 }
 277         }
 278
 279         se = tevent_add_signal(winbind_event_context(),
 280                                winbind_event_context(),
 281                                SIGHUP, 0,
 282                                winbindd_sig_hup_handler,
 283                                file);
 284         if (!se) {
 285                 return false;
 286         }
 287
 288         return true;
 289 }
 290
 291 static void winbindd_sig_chld_handler(struct tevent_context *ev,
 292                                       struct tevent_signal *se,
 293                                       int signum,
 294                                       int count,
 295                                       void *siginfo,
 296                                       void *private_data)
 297 {
 298         pid_t pid;
 299
 300         while ((pid = sys_waitpid(-1, NULL, WNOHANG)) > 0) {
 301                 winbind_child_died(pid);
 302         }
 303 }
 304
 305 static bool winbindd_setup_sig_chld_handler(void)
 306 {
 307         struct tevent_signal *se;
 308
 309         se = tevent_add_signal(winbind_event_context(),
 310                                winbind_event_context(),
 311                                SIGCHLD, 0,
 312                                winbindd_sig_chld_handler,
 313                                NULL);
 314         if (!se) {
 315                 return false;
 316         }
 317
 318         return true;
 319 }
 320
 321 static void winbindd_sig_usr2_handler(struct tevent_context *ev,
 322                                       struct tevent_signal *se,
 323                                       int signum,
 324                                       int count,
 325                                       void *siginfo,
 326                                       void *private_data)
 327 {
 328         print_winbindd_status();
 329 }
 330
 331 static bool winbindd_setup_sig_usr2_handler(void)
 332 {
 333         struct tevent_signal *se;
 334
 335         se = tevent_add_signal(winbind_event_context(),
 336                                winbind_event_context(),
 337                                SIGUSR2, 0,
 338                                winbindd_sig_usr2_handler,
 339                                NULL);
 340         if (!se) {
 341                 return false;
 342         }
 343
 344         return true;
 345 }
 346
 347 /* React on 'smbcontrol winbindd reload-config' in the same way as on SIGHUP*/
 348 static void msg_reload_services(struct messaging_context *msg,
 349                                 void *private_data,
 350                                 uint32_t msg_type,
 351                                 struct server_id server_id,
 352                                 DATA_BLOB *data)
 353 {
 354         /* Flush various caches */
 355         flush_caches();
 356         reload_services_file((const char *) private_data);
 357 }
 358
 359 /* React on 'smbcontrol winbindd shutdown' in the same way as on SIGTERM*/
 360 static void msg_shutdown(struct messaging_context *msg,
 361                          void *private_data,
 362                          uint32_t msg_type,
 363                          struct server_id server_id,
 364                          DATA_BLOB *data)
 365 {
 366         /* only the parent waits for this message */
 367         DEBUG(0,("Got shutdown message\n"));
 368         terminate(true);
 369 }
 370
 371
 372 static void winbind_msg_validate_cache(struct messaging_context *msg_ctx,
 373                                        void *private_data,
 374                                        uint32_t msg_type,
 375                                        struct server_id server_id,
 376                                        DATA_BLOB *data)
 377 {
 378         uint8 ret;
 379         pid_t child_pid;
 380
 381         DEBUG(10, ("winbindd_msg_validate_cache: got validate-cache "
 382                    "message.\n"));
 383
 384         /*
 385          * call the validation code from a child:
 386          * so we don't block the main winbindd and the validation
 387          * code can safely use fork/waitpid...
 388          */
 389         child_pid = sys_fork();
 390
 391         if (child_pid == -1) {
 392                 DEBUG(1, ("winbind_msg_validate_cache: Could not fork: %s\n",
 393                           strerror(errno)));
 394                 return;
 395         }
 396
 397         if (child_pid != 0) {
 398                 /* parent */
 399                 DEBUG(5, ("winbind_msg_validate_cache: child created with "
 400                           "pid %d.\n", (int)child_pid));
 401                 return;
 402         }
 403
 404         /* child */
 405
 406         if (!winbindd_reinit_after_fork(NULL)) {
 407                 _exit(0);
 408         }
 409
 410         /* install default SIGCHLD handler: validation code uses fork/waitpid */
 411         CatchSignal(SIGCHLD, SIG_DFL);
 412
 413         ret = (uint8)winbindd_validate_cache_nobackup();
 414         DEBUG(10, ("winbindd_msg_validata_cache: got return value %d\n", ret));
 415         messaging_send_buf(msg_ctx, server_id, MSG_WINBIND_VALIDATE_CACHE, &ret,
 416                            (size_t)1);
 417         _exit(0);
 418 }
 419
 420 static struct winbindd_dispatch_table {
 421         enum winbindd_cmd cmd;
 422         void (*fn)(struct winbindd_cli_state *state);
 423         const char *winbindd_cmd_name;
 424 } dispatch_table[] = {
 425
 426         /* Enumeration functions */
 427
 428         { WINBINDD_LIST_TRUSTDOM, winbindd_list_trusted_domains,
 429           "LIST_TRUSTDOM" },
 430
 431         /* Miscellaneous */
 432
 433         { WINBINDD_INFO, winbindd_info, "INFO" },
 434         { WINBINDD_INTERFACE_VERSION, winbindd_interface_version,
 435           "INTERFACE_VERSION" },
 436         { WINBINDD_DOMAIN_NAME, winbindd_domain_name, "DOMAIN_NAME" },
 437         { WINBINDD_DOMAIN_INFO, winbindd_domain_info, "DOMAIN_INFO" },
 438         { WINBINDD_NETBIOS_NAME, winbindd_netbios_name, "NETBIOS_NAME" },
 439         { WINBINDD_PRIV_PIPE_DIR, winbindd_priv_pipe_dir,
 440           "WINBINDD_PRIV_PIPE_DIR" },
 441
 442         /* Credential cache access */
 443         { WINBINDD_CCACHE_NTLMAUTH, winbindd_ccache_ntlm_auth, "NTLMAUTH" },
 444         { WINBINDD_CCACHE_SAVE, winbindd_ccache_save, "CCACHE_SAVE" },
 445
 446         /* WINS functions */
 447
 448         { WINBINDD_WINS_BYNAME, winbindd_wins_byname, "WINS_BYNAME" },
 449         { WINBINDD_WINS_BYIP, winbindd_wins_byip, "WINS_BYIP" },
 450
 451         /* End of list */
 452
 453         { WINBINDD_NUM_CMDS, NULL, "NONE" }
 454 };
 455
 456 struct winbindd_async_dispatch_table {
 457         enum winbindd_cmd cmd;
 458         const char *cmd_name;
 459         struct tevent_req *(*send_req)(TALLOC_CTX *mem_ctx,
 460                                        struct tevent_context *ev,
 461                                        struct winbindd_cli_state *cli,
 462                                        struct winbindd_request *request);
 463         NTSTATUS (*recv_req)(struct tevent_req *req,
 464                              struct winbindd_response *presp);
 465 };
 466
 467 static struct winbindd_async_dispatch_table async_nonpriv_table[] = {
 468         { WINBINDD_PING, "PING",
 469           wb_ping_send, wb_ping_recv },
 470         { WINBINDD_LOOKUPSID, "LOOKUPSID",
 471           winbindd_lookupsid_send, winbindd_lookupsid_recv },
 472         { WINBINDD_LOOKUPNAME, "LOOKUPNAME",
 473           winbindd_lookupname_send, winbindd_lookupname_recv },
 474         { WINBINDD_SID_TO_UID, "SID_TO_UID",
 475           winbindd_sid_to_uid_send, winbindd_sid_to_uid_recv },
 476         { WINBINDD_SID_TO_GID, "SID_TO_GID",
 477           winbindd_sid_to_gid_send, winbindd_sid_to_gid_recv },
 478         { WINBINDD_UID_TO_SID, "UID_TO_SID",
 479           winbindd_uid_to_sid_send, winbindd_uid_to_sid_recv },
 480         { WINBINDD_GID_TO_SID, "GID_TO_SID",
 481           winbindd_gid_to_sid_send, winbindd_gid_to_sid_recv },
 482         { WINBINDD_GETPWSID, "GETPWSID",
 483           winbindd_getpwsid_send, winbindd_getpwsid_recv },
 484         { WINBINDD_GETPWNAM, "GETPWNAM",
 485           winbindd_getpwnam_send, winbindd_getpwnam_recv },
 486         { WINBINDD_GETPWUID, "GETPWUID",
 487           winbindd_getpwuid_send, winbindd_getpwuid_recv },
 488         { WINBINDD_GETSIDALIASES, "GETSIDALIASES",
 489           winbindd_getsidaliases_send, winbindd_getsidaliases_recv },
 490         { WINBINDD_GETUSERDOMGROUPS, "GETUSERDOMGROUPS",
 491           winbindd_getuserdomgroups_send, winbindd_getuserdomgroups_recv },
 492         { WINBINDD_GETGROUPS, "GETGROUPS",
 493           winbindd_getgroups_send, winbindd_getgroups_recv },
 494         { WINBINDD_SHOW_SEQUENCE, "SHOW_SEQUENCE",
 495           winbindd_show_sequence_send, winbindd_show_sequence_recv },
 496         { WINBINDD_GETGRGID, "GETGRGID",
 497           winbindd_getgrgid_send, winbindd_getgrgid_recv },
 498         { WINBINDD_GETGRNAM, "GETGRNAM",
 499           winbindd_getgrnam_send, winbindd_getgrnam_recv },
 500         { WINBINDD_GETUSERSIDS, "GETUSERSIDS",
 501           winbindd_getusersids_send, winbindd_getusersids_recv },
 502         { WINBINDD_LOOKUPRIDS, "LOOKUPRIDS",
 503           winbindd_lookuprids_send, winbindd_lookuprids_recv },
 504         { WINBINDD_SETPWENT, "SETPWENT",
 505           winbindd_setpwent_send, winbindd_setpwent_recv },
 506         { WINBINDD_GETPWENT, "GETPWENT",
 507           winbindd_getpwent_send, winbindd_getpwent_recv },
 508         { WINBINDD_ENDPWENT, "ENDPWENT",
 509           winbindd_endpwent_send, winbindd_endpwent_recv },
 510         { WINBINDD_DSGETDCNAME, "DSGETDCNAME",
 511           winbindd_dsgetdcname_send, winbindd_dsgetdcname_recv },
 512         { WINBINDD_GETDCNAME, "GETDCNAME",
 513           winbindd_getdcname_send, winbindd_getdcname_recv },
 514         { WINBINDD_SETGRENT, "SETGRENT",
 515           winbindd_setgrent_send, winbindd_setgrent_recv },
 516         { WINBINDD_GETGRENT, "GETGRENT",
 517           winbindd_getgrent_send, winbindd_getgrent_recv },
 518         { WINBINDD_ENDGRENT, "ENDGRENT",
 519           winbindd_endgrent_send, winbindd_endgrent_recv },
 520         { WINBINDD_LIST_USERS, "LIST_USERS",
 521           winbindd_list_users_send, winbindd_list_users_recv },
 522         { WINBINDD_LIST_GROUPS, "LIST_GROUPS",
 523           winbindd_list_groups_send, winbindd_list_groups_recv },
 524         { WINBINDD_CHECK_MACHACC, "CHECK_MACHACC",
 525           winbindd_check_machine_acct_send, winbindd_check_machine_acct_recv },
 526         { WINBINDD_PING_DC, "PING_DC",
 527           winbindd_ping_dc_send, winbindd_ping_dc_recv },
 528         { WINBINDD_PAM_AUTH, "PAM_AUTH",
 529           winbindd_pam_auth_send, winbindd_pam_auth_recv },
 530         { WINBINDD_PAM_LOGOFF, "PAM_LOGOFF",
 531           winbindd_pam_logoff_send, winbindd_pam_logoff_recv },
 532         { WINBINDD_PAM_CHAUTHTOK, "PAM_CHAUTHTOK",
 533           winbindd_pam_chauthtok_send, winbindd_pam_chauthtok_recv },
 534         { WINBINDD_PAM_CHNG_PSWD_AUTH_CRAP, "PAM_CHNG_PSWD_AUTH_CRAP",
 535           winbindd_pam_chng_pswd_auth_crap_send,
 536           winbindd_pam_chng_pswd_auth_crap_recv },
 537
 538         { 0, NULL, NULL, NULL }
 539 };
 540
 541 static struct winbindd_async_dispatch_table async_priv_table[] = {
 542         { WINBINDD_ALLOCATE_UID, "ALLOCATE_UID",
 543           winbindd_allocate_uid_send, winbindd_allocate_uid_recv },
 544         { WINBINDD_ALLOCATE_GID, "ALLOCATE_GID",
 545           winbindd_allocate_gid_send, winbindd_allocate_gid_recv },
 546         { WINBINDD_SET_MAPPING, "SET_MAPPING",
 547           winbindd_set_mapping_send, winbindd_set_mapping_recv },
 548         { WINBINDD_REMOVE_MAPPING, "SET_MAPPING",
 549           winbindd_remove_mapping_send, winbindd_remove_mapping_recv },
 550         { WINBINDD_SET_HWM, "SET_HWM",
 551           winbindd_set_hwm_send, winbindd_set_hwm_recv },
 552         { WINBINDD_CHANGE_MACHACC, "CHANGE_MACHACC",
 553           winbindd_change_machine_acct_send, winbindd_change_machine_acct_recv },
 554         { WINBINDD_PAM_AUTH_CRAP, "PAM_AUTH_CRAP",
 555           winbindd_pam_auth_crap_send, winbindd_pam_auth_crap_recv },
 556
 557         { 0, NULL, NULL, NULL }
 558 };
 559
 560 static void wb_request_done(struct tevent_req *req);
 561
 562 static void process_request(struct winbindd_cli_state *state)
 563 {
 564         struct winbindd_dispatch_table *table = dispatch_table;
 565         struct winbindd_async_dispatch_table *atable;
 566
 567         state->mem_ctx = talloc_named(state, 0, "winbind request");
 568         if (state->mem_ctx == NULL)
 569                 return;
 570
 571         /* Remember who asked us. */
 572         state->pid = state->request->pid;
 573
 574         state->cmd_name = "unknown request";
 575         state->recv_fn = NULL;
 576
 577         /* Process command */
 578
 579         for (atable = async_nonpriv_table; atable->send_req; atable += 1) {
 580                 if (state->request->cmd == atable->cmd) {
 581                         break;
 582                 }
 583         }
 584
 585         if ((atable->send_req == NULL) && state->privileged) {
 586                 for (atable = async_priv_table; atable->send_req;
 587                      atable += 1) {
 588                         if (state->request->cmd == atable->cmd) {
 589                                 break;
 590                         }
 591                 }
 592         }
 593
 594         if (atable->send_req != NULL) {
 595                 struct tevent_req *req;
 596
 597                 state->cmd_name = atable->cmd_name;
 598                 state->recv_fn = atable->recv_req;
 599
 600                 DEBUG(10, ("process_request: Handling async request %d:%s\n",
 601                            (int)state->pid, state->cmd_name));
 602
 603                 req = atable->send_req(state->mem_ctx, winbind_event_context(),
 604                                        state, state->request);
 605                 if (req == NULL) {
 606                         DEBUG(0, ("process_request: atable->send failed for "
 607                                   "%s\n", atable->cmd_name));
 608                         request_error(state);
 609                         return;
 610                 }
 611                 tevent_req_set_callback(req, wb_request_done, state);
 612                 return;
 613         }
 614
 615         state->response = talloc_zero(state->mem_ctx,
 616                                       struct winbindd_response);
 617         if (state->response == NULL) {
 618                 DEBUG(10, ("talloc failed\n"));
 619                 remove_client(state);
 620                 return;
 621         }
 622         state->response->result = WINBINDD_PENDING;
 623         state->response->length = sizeof(struct winbindd_response);
 624
 625         for (table = dispatch_table; table->fn; table++) {
 626                 if (state->request->cmd == table->cmd) {
 627                         DEBUG(10,("process_request: request fn %s\n",
 628                                   table->winbindd_cmd_name ));
 629                         state->cmd_name = table->winbindd_cmd_name;
 630                         table->fn(state);
 631                         break;
 632                 }
 633         }
 634
 635         if (!table->fn) {
 636                 DEBUG(10,("process_request: unknown request fn number %d\n",
 637                           (int)state->request->cmd ));
 638                 request_error(state);
 639         }
 640 }
 641
 642 static void wb_request_done(struct tevent_req *req)
 643 {
 644         struct winbindd_cli_state *state = tevent_req_callback_data(
 645                 req, struct winbindd_cli_state);
 646         NTSTATUS status;
 647
 648         state->response = talloc_zero(state->mem_ctx,
 649                                       struct winbindd_response);
 650         if (state->response == NULL) {
 651                 DEBUG(0, ("wb_request_done[%d:%s]: talloc_zero failed - removing client\n",
 652                           (int)state->pid, state->cmd_name));
 653                 remove_client(state);
 654                 return;
 655         }
 656         state->response->result = WINBINDD_PENDING;
 657         state->response->length = sizeof(struct winbindd_response);
 658
 659         status = state->recv_fn(req, state->response);
 660         TALLOC_FREE(req);
 661
 662         DEBUG(10,("wb_request_done[%d:%s]: %s\n",
 663                   (int)state->pid, state->cmd_name, nt_errstr(status)));
 664
 665         if (!NT_STATUS_IS_OK(status)) {
 666                 request_error(state);
 667                 return;
 668         }
 669         request_ok(state);
 670 }
 671
 672 /*
 673  * This is the main event loop of winbind requests. It goes through a
 674  * state-machine of 3 read/write requests, 4 if you have extra data to send.
 675  *
 676  * An idle winbind client has a read request of 4 bytes outstanding,
 677  * finalizing function is request_len_recv, checking the length. request_recv
 678  * then processes the packet. The processing function then at some point has
 679  * to call request_finished which schedules sending the response.
 680  */
 681
 682 static void request_finished(struct winbindd_cli_state *state);
 683
 684 static void winbind_client_request_read(struct tevent_req *req);
 685 static void winbind_client_response_written(struct tevent_req *req);
 686
 687 static void request_finished(struct winbindd_cli_state *state)
 688 {
 689         struct tevent_req *req;
 690
 691         TALLOC_FREE(state->request);
 692
 693         req = wb_resp_write_send(state, winbind_event_context(),
 694                                  state->out_queue, state->sock,
 695                                  state->response);
 696         if (req == NULL) {
 697                 DEBUG(10,("request_finished[%d:%s]: wb_resp_write_send() failed\n",
 698                           (int)state->pid, state->cmd_name));
 699                 remove_client(state);
 700                 return;
 701         }
 702         tevent_req_set_callback(req, winbind_client_response_written, state);
 703 }
 704
 705 static void winbind_client_response_written(struct tevent_req *req)
 706 {
 707         struct winbindd_cli_state *state = tevent_req_callback_data(
 708                 req, struct winbindd_cli_state);
 709         ssize_t ret;
 710         int err;
 711
 712         ret = wb_resp_write_recv(req, &err);
 713         TALLOC_FREE(req);
 714         if (ret == -1) {
 715                 close(state->sock);
 716                 state->sock = -1;
 717                 DEBUG(2, ("Could not write response[%d:%s] to client: %s\n",
 718                           (int)state->pid, state->cmd_name, strerror(err)));
 719                 remove_client(state);
 720                 return;
 721         }
 722
 723         DEBUG(10,("winbind_client_response_written[%d:%s]: delivered response "
 724                   "to client\n", (int)state->pid, state->cmd_name));
 725
 726         TALLOC_FREE(state->mem_ctx);
 727         state->response = NULL;
 728         state->cmd_name = "no request";
 729         state->recv_fn = NULL;
 730
 731         req = wb_req_read_send(state, winbind_event_context(), state->sock,
 732                                WINBINDD_MAX_EXTRA_DATA);
 733         if (req == NULL) {
 734                 remove_client(state);
 735                 return;
 736         }
 737         tevent_req_set_callback(req, winbind_client_request_read, state);
 738 }
 739
 740 void request_error(struct winbindd_cli_state *state)
 741 {
 742         SMB_ASSERT(state->response->result == WINBINDD_PENDING);
 743         state->response->result = WINBINDD_ERROR;
 744         request_finished(state);
 745 }
 746
 747 void request_ok(struct winbindd_cli_state *state)
 748 {
 749         SMB_ASSERT(state->response->result == WINBINDD_PENDING);
 750         state->response->result = WINBINDD_OK;
 751         request_finished(state);
 752 }
 753
 754 /* Process a new connection by adding it to the client connection list */
 755
 756 static void new_connection(int listen_sock, bool privileged)
 757 {
 758         struct sockaddr_un sunaddr;
 759         struct winbindd_cli_state *state;
 760         struct tevent_req *req;
 761         socklen_t len;
 762         int sock;
 763
 764         /* Accept connection */
 765
 766         len = sizeof(sunaddr);
 767
 768         do {
 769                 sock = accept(listen_sock, (struct sockaddr *)(void *)&sunaddr,
 770                               &len);
 771         } while (sock == -1 && errno == EINTR);
 772
 773         if (sock == -1)
 774                 return;
 775
 776         DEBUG(6,("accepted socket %d\n", sock));
 777
 778         /* Create new connection structure */
 779
 780         if ((state = TALLOC_ZERO_P(NULL, struct winbindd_cli_state)) == NULL) {
 781                 close(sock);
 782                 return;
 783         }
 784
 785         state->sock = sock;
 786
 787         state->out_queue = tevent_queue_create(state, "winbind client reply");
 788         if (state->out_queue == NULL) {
 789                 close(sock);
 790                 TALLOC_FREE(state);
 791                 return;
 792         }
 793
 794         state->last_access = time(NULL);
 795
 796         state->privileged = privileged;
 797
 798         req = wb_req_read_send(state, winbind_event_context(), state->sock,
 799                                WINBINDD_MAX_EXTRA_DATA);
 800         if (req == NULL) {
 801                 TALLOC_FREE(state);
 802                 close(sock);
 803                 return;
 804         }
 805         tevent_req_set_callback(req, winbind_client_request_read, state);
 806
 807         /* Add to connection list */
 808
 809         winbindd_add_client(state);
 810 }
 811
 812 static void winbind_client_request_read(struct tevent_req *req)
 813 {
 814         struct winbindd_cli_state *state = tevent_req_callback_data(
 815                 req, struct winbindd_cli_state);
 816         ssize_t ret;
 817         int err;
 818
 819         ret = wb_req_read_recv(req, state, &state->request, &err);
 820         TALLOC_FREE(req);
 821         if (ret == -1) {
 822                 if (err == EPIPE) {
 823                         DEBUG(6, ("closing socket %d, client exited\n",
 824                                   state->sock));
 825                 } else {
 826                         DEBUG(2, ("Could not read client request from fd %d: "
 827                                   "%s\n", state->sock, strerror(err)));
 828                 }
 829                 close(state->sock);
 830                 state->sock = -1;
 831                 remove_client(state);
 832                 return;
 833         }
 834         process_request(state);
 835 }
 836
 837 /* Remove a client connection from client connection list */
 838
 839 static void remove_client(struct winbindd_cli_state *state)
 840 {
 841         char c = 0;
 842         int nwritten;
 843
 844         /* It's a dead client - hold a funeral */
 845
 846         if (state == NULL) {
 847                 return;
 848         }
 849
 850         if (state->sock != -1) {
 851                 /* tell client, we are closing ... */
 852                 nwritten = write(state->sock, &c, sizeof(c));
 853                 if (nwritten == -1) {
 854                         DEBUG(2, ("final write to client failed: %s\n",
 855                                 strerror(errno)));
 856                 }
 857
 858                 /* Close socket */
 859
 860                 close(state->sock);
 861                 state->sock = -1;
 862         }
 863
 864         TALLOC_FREE(state->mem_ctx);
 865
 866         /* Remove from list and free */
 867
 868         winbindd_remove_client(state);
 869         TALLOC_FREE(state);
 870 }
 871
 872 /* Shutdown client connection which has been idle for the longest time */
 873
 874 static bool remove_idle_client(void)
 875 {
 876         struct winbindd_cli_state *state, *remove_state = NULL;
 877         time_t last_access = 0;
 878         int nidle = 0;
 879
 880         for (state = winbindd_client_list(); state; state = state->next) {
 881                 if (state->response == NULL &&
 882                     !state->pwent_state && !state->grent_state) {
 883                         nidle++;
 884                         if (!last_access || state->last_access < last_access) {
 885                                 last_access = state->last_access;
 886                                 remove_state = state;
 887                         }
 888                 }
 889         }
 890
 891         if (remove_state) {
 892                 DEBUG(5,("Found %d idle client connections, shutting down sock %d, pid %u\n",
 893                         nidle, remove_state->sock, (unsigned int)remove_state->pid));
 894                 remove_client(remove_state);
 895                 return True;
 896         }
 897
 898         return False;
 899 }
 900
 901 struct winbindd_listen_state {
 902         bool privileged;
 903         int fd;
 904 };
 905
 906 static void winbindd_listen_fde_handler(struct tevent_context *ev,
 907                                         struct tevent_fd *fde,
 908                                         uint16_t flags,
 909                                         void *private_data)
 910 {
 911         struct winbindd_listen_state *s = talloc_get_type_abort(private_data,
 912                                           struct winbindd_listen_state);
 913
 914         while (winbindd_num_clients() >
 915                WINBINDD_MAX_SIMULTANEOUS_CLIENTS - 1) {
 916                 DEBUG(5,("winbindd: Exceeding %d client "
 917                          "connections, removing idle "
 918                          "connection.\n",
 919                          WINBINDD_MAX_SIMULTANEOUS_CLIENTS));
 920                 if (!remove_idle_client()) {
 921                         DEBUG(0,("winbindd: Exceeding %d "
 922                                  "client connections, no idle "
 923                                  "connection found\n",
 924                                  WINBINDD_MAX_SIMULTANEOUS_CLIENTS));
 925                         break;
 926                 }
 927         }
 928         new_connection(s->fd, s->privileged);
 929 }
 930
 931 /*
 932  * Winbindd socket accessor functions
 933  */
 934
 935 const char *get_winbind_pipe_dir(void)
 936 {
 937         return lp_parm_const_string(-1, "winbindd", "socket dir", WINBINDD_SOCKET_DIR);
 938 }
 939
 940 char *get_winbind_priv_pipe_dir(void)
 941 {
 942         return lock_path(WINBINDD_PRIV_SOCKET_SUBDIR);
 943 }
 944
 945 static bool winbindd_setup_listeners(void)
 946 {
 947         struct winbindd_listen_state *pub_state = NULL;
 948         struct winbindd_listen_state *priv_state = NULL;
 949         struct tevent_fd *fde;
 950
 951         pub_state = talloc(winbind_event_context(),
 952                            struct winbindd_listen_state);
 953         if (!pub_state) {
 954                 goto failed;
 955         }
 956
 957         pub_state->privileged = false;
 958         pub_state->fd = create_pipe_sock(
 959                 get_winbind_pipe_dir(), WINBINDD_SOCKET_NAME, 0755);
 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 = create_pipe_sock(
 981                 get_winbind_priv_pipe_dir(), WINBINDD_SOCKET_NAME, 0750);
 982         if (priv_state->fd == -1) {
 983                 goto failed;
 984         }
 985
 986         fde = tevent_add_fd(winbind_event_context(), priv_state,
 987                             priv_state->fd, TEVENT_FD_READ,
 988                             winbindd_listen_fde_handler, priv_state);
 989         if (fde == NULL) {
 990                 close(priv_state->fd);
 991                 goto failed;
 992         }
 993         tevent_fd_set_auto_close(fde);
 994
 995         return true;
 996 failed:
 997         TALLOC_FREE(pub_state);
 998         TALLOC_FREE(priv_state);
 999         return false;
1000 }
1001
1002 bool winbindd_use_idmap_cache(void)
1003 {
1004         return !opt_nocache;
1005 }
1006
1007 bool winbindd_use_cache(void)
1008 {
1009         return !opt_nocache;
1010 }
1011
1012 void winbindd_register_handlers(void)
1013 {
1014         struct tevent_timer *te;
1015         /* Setup signal handlers */
1016
1017         if (!winbindd_setup_sig_term_handler(true))
1018                 exit(1);
1019         if (!winbindd_setup_sig_hup_handler(NULL))
1020                 exit(1);
1021         if (!winbindd_setup_sig_chld_handler())
1022                 exit(1);
1023         if (!winbindd_setup_sig_usr2_handler())
1024                 exit(1);
1025
1026         CatchSignal(SIGPIPE, SIG_IGN);                 /* Ignore sigpipe */
1027
1028         /*
1029          * Ensure all cache and idmap caches are consistent
1030          * and initialized before we startup.
1031          */
1032         if (!winbindd_cache_validate_and_initialize()) {
1033                 exit(1);
1034         }
1035
1036         /* get broadcast messages */
1037
1038         if (!serverid_register(procid_self(),
1039                                FLAG_MSG_GENERAL|FLAG_MSG_DBWRAP)) {
1040                 DEBUG(1, ("Could not register myself in serverid.tdb\n"));
1041                 exit(1);
1042         }
1043
1044         /* React on 'smbcontrol winbindd reload-config' in the same way
1045            as to SIGHUP signal */
1046         messaging_register(winbind_messaging_context(), NULL,
1047                            MSG_SMB_CONF_UPDATED, msg_reload_services);
1048         messaging_register(winbind_messaging_context(), NULL,
1049                            MSG_SHUTDOWN, msg_shutdown);
1050
1051         /* Handle online/offline messages. */
1052         messaging_register(winbind_messaging_context(), NULL,
1053                            MSG_WINBIND_OFFLINE, winbind_msg_offline);
1054         messaging_register(winbind_messaging_context(), NULL,
1055                            MSG_WINBIND_ONLINE, winbind_msg_online);
1056         messaging_register(winbind_messaging_context(), NULL,
1057                            MSG_WINBIND_ONLINESTATUS, winbind_msg_onlinestatus);
1058
1059         messaging_register(winbind_messaging_context(), NULL,
1060                            MSG_DUMP_EVENT_LIST, winbind_msg_dump_event_list);
1061
1062         messaging_register(winbind_messaging_context(), NULL,
1063                            MSG_WINBIND_VALIDATE_CACHE,
1064                            winbind_msg_validate_cache);
1065
1066         messaging_register(winbind_messaging_context(), NULL,
1067                            MSG_WINBIND_DUMP_DOMAIN_LIST,
1068                            winbind_msg_dump_domain_list);
1069
1070         /* Register handler for MSG_DEBUG. */
1071         messaging_register(winbind_messaging_context(), NULL,
1072                            MSG_DEBUG,
1073                            winbind_msg_debug);
1074
1075         netsamlogon_cache_init(); /* Non-critical */
1076
1077         /* clear the cached list of trusted domains */
1078
1079         wcache_tdc_clear();
1080
1081         if (!init_domain_list()) {
1082                 DEBUG(0,("unable to initialize domain list\n"));
1083                 exit(1);
1084         }
1085
1086         init_idmap_child();
1087         init_locator_child();
1088
1089         smb_nscd_flush_user_cache();
1090         smb_nscd_flush_group_cache();
1091
1092         te = tevent_add_timer(winbind_event_context(), NULL, timeval_zero(),
1093                               rescan_trusted_domains, NULL);
1094         if (te == NULL) {
1095                 DEBUG(0, ("Could not trigger rescan_trusted_domains()\n"));
1096                 exit(1);
1097         }
1098
1099 }
1100
1101 /* Main function */
1102
1103 int main(int argc, char **argv, char **envp)
1104 {
1105         static bool is_daemon = False;
1106         static bool Fork = True;
1107         static bool log_stdout = False;
1108         static bool no_process_group = False;
1109         enum {
1110                 OPT_DAEMON = 1000,
1111                 OPT_FORK,
1112                 OPT_NO_PROCESS_GROUP,
1113                 OPT_LOG_STDOUT
1114         };
1115         struct poptOption long_options[] = {
1116                 POPT_AUTOHELP
1117                 { "stdout", 'S', POPT_ARG_NONE, NULL, OPT_LOG_STDOUT, "Log to stdout" },
1118                 { "foreground", 'F', POPT_ARG_NONE, NULL, OPT_FORK, "Daemon in foreground mode" },
1119                 { "no-process-group", 0, POPT_ARG_NONE, NULL, OPT_NO_PROCESS_GROUP, "Don't create a new process group" },
1120                 { "daemon", 'D', POPT_ARG_NONE, NULL, OPT_DAEMON, "Become a daemon (default)" },
1121                 { "interactive", 'i', POPT_ARG_NONE, NULL, 'i', "Interactive mode" },
1122                 { "no-caching", 'n', POPT_ARG_NONE, NULL, 'n', "Disable caching" },
1123                 POPT_COMMON_SAMBA
1124                 POPT_TABLEEND
1125         };
1126         poptContext pc;
1127         int opt;
1128         TALLOC_CTX *frame = talloc_stackframe();
1129         NTSTATUS status;
1130
1131         /* glibc (?) likes to print "User defined signal 1" and exit if a
1132            SIGUSR[12] is received before a handler is installed */
1133
1134         CatchSignal(SIGUSR1, SIG_IGN);
1135         CatchSignal(SIGUSR2, SIG_IGN);
1136
1137         fault_setup((void (*)(void *))fault_quit );
1138         dump_core_setup("winbindd");
1139
1140         load_case_tables();
1141
1142         /* Initialise for running in non-root mode */
1143
1144         sec_init();
1145
1146         set_remote_machine_name("winbindd", False);
1147
1148         /* Set environment variable so we don't recursively call ourselves.
1149            This may also be useful interactively. */
1150
1151         if ( !winbind_off() ) {
1152                 DEBUG(0,("Failed to disable recusive winbindd calls.  Exiting.\n"));
1153                 exit(1);
1154         }
1155
1156         /* Initialise samba/rpc client stuff */
1157
1158         pc = poptGetContext("winbindd", argc, (const char **)argv, long_options, 0);
1159
1160         while ((opt = poptGetNextOpt(pc)) != -1) {
1161                 switch (opt) {
1162                         /* Don't become a daemon */
1163                 case OPT_DAEMON:
1164                         is_daemon = True;
1165                         break;
1166                 case 'i':
1167                         interactive = True;
1168                         log_stdout = True;
1169                         Fork = False;
1170                         break;
1171                 case OPT_FORK:
1172                         Fork = false;
1173                         break;
1174                 case OPT_NO_PROCESS_GROUP:
1175                         no_process_group = true;
1176                         break;
1177                 case OPT_LOG_STDOUT:
1178                         log_stdout = true;
1179                         break;
1180                 case 'n':
1181                         opt_nocache = true;
1182                         break;
1183                 default:
1184                         d_fprintf(stderr, "\nInvalid option %s: %s\n\n",
1185                                   poptBadOption(pc, 0), poptStrerror(opt));
1186                         poptPrintUsage(pc, stderr, 0);
1187                         exit(1);
1188                 }
1189         }
1190
1191         if (is_daemon && interactive) {
1192                 d_fprintf(stderr,"\nERROR: "
1193                           "Option -i|--interactive is not allowed together with -D|--daemon\n\n");
1194                 poptPrintUsage(pc, stderr, 0);
1195                 exit(1);
1196         }
1197
1198         if (log_stdout && Fork) {
1199                 d_fprintf(stderr, "\nERROR: "
1200                           "Can't log to stdout (-S) unless daemon is in foreground +(-F) or interactive (-i)\n\n");
1201                 poptPrintUsage(pc, stderr, 0);
1202                 exit(1);
1203         }
1204
1205         poptFreeContext(pc);
1206
1207         if (!override_logfile) {
1208                 char *lfile = NULL;
1209                 if (asprintf(&lfile,"%s/log.winbindd",
1210                                 get_dyn_LOGFILEBASE()) > 0) {
1211                         lp_set_logfile(lfile);
1212                         SAFE_FREE(lfile);
1213                 }
1214         }
1215         setup_logging("winbindd", log_stdout);
1216         reopen_logs();
1217
1218         DEBUG(0,("winbindd version %s started.\n", samba_version_string()));
1219         DEBUGADD(0,("%s\n", COPYRIGHT_STARTUP_MESSAGE));
1220
1221         if (!lp_load_initial_only(get_dyn_CONFIGFILE())) {
1222                 DEBUG(0, ("error opening config file\n"));
1223                 exit(1);
1224         }
1225
1226         /* Initialise messaging system */
1227
1228         if (winbind_messaging_context() == NULL) {
1229                 exit(1);
1230         }
1231
1232         if (!reload_services_file(NULL)) {
1233                 DEBUG(0, ("error opening config file\n"));
1234                 exit(1);
1235         }
1236
1237         if (!directory_exist(lp_lockdir())) {
1238                 mkdir(lp_lockdir(), 0755);
1239         }
1240
1241         /* Setup names. */
1242
1243         if (!init_names())
1244                 exit(1);
1245
1246         load_interfaces();
1247
1248         if (!secrets_init()) {
1249
1250                 DEBUG(0,("Could not initialize domain trust account secrets. Giving up\n"));
1251                 return False;
1252         }
1253
1254         /* Unblock all signals we are interested in as they may have been
1255            blocked by the parent process. */
1256
1257         BlockSignals(False, SIGINT);
1258         BlockSignals(False, SIGQUIT);
1259         BlockSignals(False, SIGTERM);
1260         BlockSignals(False, SIGUSR1);
1261         BlockSignals(False, SIGUSR2);
1262         BlockSignals(False, SIGHUP);
1263         BlockSignals(False, SIGCHLD);
1264
1265         if (!interactive)
1266                 become_daemon(Fork, no_process_group, log_stdout);
1267
1268         pidfile_create("winbindd");
1269
1270 #if HAVE_SETPGID
1271         /*
1272          * If we're interactive we want to set our own process group for
1273          * signal management.
1274          */
1275         if (interactive && !no_process_group)
1276                 setpgid( (pid_t)0, (pid_t)0);
1277 #endif
1278
1279         TimeInit();
1280
1281         /* Don't use winbindd_reinit_after_fork here as
1282          * we're just starting up and haven't created any
1283          * winbindd-specific resources we must free yet. JRA.
1284          */
1285
1286         status = reinit_after_fork(winbind_messaging_context(),
1287                                    winbind_event_context(),
1288                                    procid_self(), false);
1289         if (!NT_STATUS_IS_OK(status)) {
1290                 DEBUG(0,("reinit_after_fork() failed\n"));
1291                 exit(1);
1292         }
1293
1294         winbindd_register_handlers();
1295
1296         rpc_lsarpc_init(NULL);
1297         rpc_samr_init(NULL);
1298
1299         if (!init_system_info()) {
1300                 DEBUG(0,("ERROR: failed to setup system user info.\n"));
1301                 exit(1);
1302         }
1303
1304         /* setup listen sockets */
1305
1306         if (!winbindd_setup_listeners()) {
1307                 DEBUG(0,("winbindd_setup_listeners() failed\n"));
1308                 exit(1);
1309         }
1310
1311         TALLOC_FREE(frame);
1312         /* Loop waiting for requests */
1313         while (1) {
1314                 frame = talloc_stackframe();
1315
1316                 if (tevent_loop_once(winbind_event_context()) == -1) {
1317                         DEBUG(1, ("tevent_loop_once() failed: %s\n",
1318                                   strerror(errno)));
1319                         return 1;
1320                 }
1321
1322                 TALLOC_FREE(frame);
1323         }
1324
1325         return 0;
1326 }