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_CHANGE_MACHACC, "CHANGE_MACHACC",
 551           winbindd_change_machine_acct_send, winbindd_change_machine_acct_recv },
 552         { WINBINDD_PAM_AUTH_CRAP, "PAM_AUTH_CRAP",
 553           winbindd_pam_auth_crap_send, winbindd_pam_auth_crap_recv },
 554
 555         { 0, NULL, NULL, NULL }
 556 };
 557
 558 static void wb_request_done(struct tevent_req *req);
 559
 560 static void process_request(struct winbindd_cli_state *state)
 561 {
 562         struct winbindd_dispatch_table *table = dispatch_table;
 563         struct winbindd_async_dispatch_table *atable;
 564
 565         state->mem_ctx = talloc_named(state, 0, "winbind request");
 566         if (state->mem_ctx == NULL)
 567                 return;
 568
 569         /* Remember who asked us. */
 570         state->pid = state->request->pid;
 571
 572         state->cmd_name = "unknown request";
 573         state->recv_fn = NULL;
 574
 575         /* Process command */
 576
 577         for (atable = async_nonpriv_table; atable->send_req; atable += 1) {
 578                 if (state->request->cmd == atable->cmd) {
 579                         break;
 580                 }
 581         }
 582
 583         if ((atable->send_req == NULL) && state->privileged) {
 584                 for (atable = async_priv_table; atable->send_req;
 585                      atable += 1) {
 586                         if (state->request->cmd == atable->cmd) {
 587                                 break;
 588                         }
 589                 }
 590         }
 591
 592         if (atable->send_req != NULL) {
 593                 struct tevent_req *req;
 594
 595                 state->cmd_name = atable->cmd_name;
 596                 state->recv_fn = atable->recv_req;
 597
 598                 DEBUG(10, ("process_request: Handling async request %d:%s\n",
 599                            (int)state->pid, state->cmd_name));
 600
 601                 req = atable->send_req(state->mem_ctx, winbind_event_context(),
 602                                        state, state->request);
 603                 if (req == NULL) {
 604                         DEBUG(0, ("process_request: atable->send failed for "
 605                                   "%s\n", atable->cmd_name));
 606                         request_error(state);
 607                         return;
 608                 }
 609                 tevent_req_set_callback(req, wb_request_done, state);
 610                 return;
 611         }
 612
 613         state->response = talloc_zero(state->mem_ctx,
 614                                       struct winbindd_response);
 615         if (state->response == NULL) {
 616                 DEBUG(10, ("talloc failed\n"));
 617                 remove_client(state);
 618                 return;
 619         }
 620         state->response->result = WINBINDD_PENDING;
 621         state->response->length = sizeof(struct winbindd_response);
 622
 623         for (table = dispatch_table; table->fn; table++) {
 624                 if (state->request->cmd == table->cmd) {
 625                         DEBUG(10,("process_request: request fn %s\n",
 626                                   table->winbindd_cmd_name ));
 627                         state->cmd_name = table->winbindd_cmd_name;
 628                         table->fn(state);
 629                         break;
 630                 }
 631         }
 632
 633         if (!table->fn) {
 634                 DEBUG(10,("process_request: unknown request fn number %d\n",
 635                           (int)state->request->cmd ));
 636                 request_error(state);
 637         }
 638 }
 639
 640 static void wb_request_done(struct tevent_req *req)
 641 {
 642         struct winbindd_cli_state *state = tevent_req_callback_data(
 643                 req, struct winbindd_cli_state);
 644         NTSTATUS status;
 645
 646         state->response = talloc_zero(state->mem_ctx,
 647                                       struct winbindd_response);
 648         if (state->response == NULL) {
 649                 DEBUG(0, ("wb_request_done[%d:%s]: talloc_zero failed - removing client\n",
 650                           (int)state->pid, state->cmd_name));
 651                 remove_client(state);
 652                 return;
 653         }
 654         state->response->result = WINBINDD_PENDING;
 655         state->response->length = sizeof(struct winbindd_response);
 656
 657         status = state->recv_fn(req, state->response);
 658         TALLOC_FREE(req);
 659
 660         DEBUG(10,("wb_request_done[%d:%s]: %s\n",
 661                   (int)state->pid, state->cmd_name, nt_errstr(status)));
 662
 663         if (!NT_STATUS_IS_OK(status)) {
 664                 request_error(state);
 665                 return;
 666         }
 667         request_ok(state);
 668 }
 669
 670 /*
 671  * This is the main event loop of winbind requests. It goes through a
 672  * state-machine of 3 read/write requests, 4 if you have extra data to send.
 673  *
 674  * An idle winbind client has a read request of 4 bytes outstanding,
 675  * finalizing function is request_len_recv, checking the length. request_recv
 676  * then processes the packet. The processing function then at some point has
 677  * to call request_finished which schedules sending the response.
 678  */
 679
 680 static void request_finished(struct winbindd_cli_state *state);
 681
 682 static void winbind_client_request_read(struct tevent_req *req);
 683 static void winbind_client_response_written(struct tevent_req *req);
 684
 685 static void request_finished(struct winbindd_cli_state *state)
 686 {
 687         struct tevent_req *req;
 688
 689         TALLOC_FREE(state->request);
 690
 691         req = wb_resp_write_send(state, winbind_event_context(),
 692                                  state->out_queue, state->sock,
 693                                  state->response);
 694         if (req == NULL) {
 695                 DEBUG(10,("request_finished[%d:%s]: wb_resp_write_send() failed\n",
 696                           (int)state->pid, state->cmd_name));
 697                 remove_client(state);
 698                 return;
 699         }
 700         tevent_req_set_callback(req, winbind_client_response_written, state);
 701 }
 702
 703 static void winbind_client_response_written(struct tevent_req *req)
 704 {
 705         struct winbindd_cli_state *state = tevent_req_callback_data(
 706                 req, struct winbindd_cli_state);
 707         ssize_t ret;
 708         int err;
 709
 710         ret = wb_resp_write_recv(req, &err);
 711         TALLOC_FREE(req);
 712         if (ret == -1) {
 713                 close(state->sock);
 714                 state->sock = -1;
 715                 DEBUG(2, ("Could not write response[%d:%s] to client: %s\n",
 716                           (int)state->pid, state->cmd_name, strerror(err)));
 717                 remove_client(state);
 718                 return;
 719         }
 720
 721         DEBUG(10,("winbind_client_response_written[%d:%s]: delivered response "
 722                   "to client\n", (int)state->pid, state->cmd_name));
 723
 724         TALLOC_FREE(state->mem_ctx);
 725         state->response = NULL;
 726         state->cmd_name = "no request";
 727         state->recv_fn = NULL;
 728
 729         req = wb_req_read_send(state, winbind_event_context(), state->sock,
 730                                WINBINDD_MAX_EXTRA_DATA);
 731         if (req == NULL) {
 732                 remove_client(state);
 733                 return;
 734         }
 735         tevent_req_set_callback(req, winbind_client_request_read, state);
 736 }
 737
 738 void request_error(struct winbindd_cli_state *state)
 739 {
 740         SMB_ASSERT(state->response->result == WINBINDD_PENDING);
 741         state->response->result = WINBINDD_ERROR;
 742         request_finished(state);
 743 }
 744
 745 void request_ok(struct winbindd_cli_state *state)
 746 {
 747         SMB_ASSERT(state->response->result == WINBINDD_PENDING);
 748         state->response->result = WINBINDD_OK;
 749         request_finished(state);
 750 }
 751
 752 /* Process a new connection by adding it to the client connection list */
 753
 754 static void new_connection(int listen_sock, bool privileged)
 755 {
 756         struct sockaddr_un sunaddr;
 757         struct winbindd_cli_state *state;
 758         struct tevent_req *req;
 759         socklen_t len;
 760         int sock;
 761
 762         /* Accept connection */
 763
 764         len = sizeof(sunaddr);
 765
 766         do {
 767                 sock = accept(listen_sock, (struct sockaddr *)(void *)&sunaddr,
 768                               &len);
 769         } while (sock == -1 && errno == EINTR);
 770
 771         if (sock == -1)
 772                 return;
 773
 774         DEBUG(6,("accepted socket %d\n", sock));
 775
 776         /* Create new connection structure */
 777
 778         if ((state = TALLOC_ZERO_P(NULL, struct winbindd_cli_state)) == NULL) {
 779                 close(sock);
 780                 return;
 781         }
 782
 783         state->sock = sock;
 784
 785         state->out_queue = tevent_queue_create(state, "winbind client reply");
 786         if (state->out_queue == NULL) {
 787                 close(sock);
 788                 TALLOC_FREE(state);
 789                 return;
 790         }
 791
 792         state->last_access = time(NULL);
 793
 794         state->privileged = privileged;
 795
 796         req = wb_req_read_send(state, winbind_event_context(), state->sock,
 797                                WINBINDD_MAX_EXTRA_DATA);
 798         if (req == NULL) {
 799                 TALLOC_FREE(state);
 800                 close(sock);
 801                 return;
 802         }
 803         tevent_req_set_callback(req, winbind_client_request_read, state);
 804
 805         /* Add to connection list */
 806
 807         winbindd_add_client(state);
 808 }
 809
 810 static void winbind_client_request_read(struct tevent_req *req)
 811 {
 812         struct winbindd_cli_state *state = tevent_req_callback_data(
 813                 req, struct winbindd_cli_state);
 814         ssize_t ret;
 815         int err;
 816
 817         ret = wb_req_read_recv(req, state, &state->request, &err);
 818         TALLOC_FREE(req);
 819         if (ret == -1) {
 820                 if (err == EPIPE) {
 821                         DEBUG(6, ("closing socket %d, client exited\n",
 822                                   state->sock));
 823                 } else {
 824                         DEBUG(2, ("Could not read client request from fd %d: "
 825                                   "%s\n", state->sock, strerror(err)));
 826                 }
 827                 close(state->sock);
 828                 state->sock = -1;
 829                 remove_client(state);
 830                 return;
 831         }
 832         process_request(state);
 833 }
 834
 835 /* Remove a client connection from client connection list */
 836
 837 static void remove_client(struct winbindd_cli_state *state)
 838 {
 839         char c = 0;
 840         int nwritten;
 841
 842         /* It's a dead client - hold a funeral */
 843
 844         if (state == NULL) {
 845                 return;
 846         }
 847
 848         if (state->sock != -1) {
 849                 /* tell client, we are closing ... */
 850                 nwritten = write(state->sock, &c, sizeof(c));
 851                 if (nwritten == -1) {
 852                         DEBUG(2, ("final write to client failed: %s\n",
 853                                 strerror(errno)));
 854                 }
 855
 856                 /* Close socket */
 857
 858                 close(state->sock);
 859                 state->sock = -1;
 860         }
 861
 862         TALLOC_FREE(state->mem_ctx);
 863
 864         /* Remove from list and free */
 865
 866         winbindd_remove_client(state);
 867         TALLOC_FREE(state);
 868 }
 869
 870 /* Shutdown client connection which has been idle for the longest time */
 871
 872 static bool remove_idle_client(void)
 873 {
 874         struct winbindd_cli_state *state, *remove_state = NULL;
 875         time_t last_access = 0;
 876         int nidle = 0;
 877
 878         for (state = winbindd_client_list(); state; state = state->next) {
 879                 if (state->response == NULL &&
 880                     !state->pwent_state && !state->grent_state) {
 881                         nidle++;
 882                         if (!last_access || state->last_access < last_access) {
 883                                 last_access = state->last_access;
 884                                 remove_state = state;
 885                         }
 886                 }
 887         }
 888
 889         if (remove_state) {
 890                 DEBUG(5,("Found %d idle client connections, shutting down sock %d, pid %u\n",
 891                         nidle, remove_state->sock, (unsigned int)remove_state->pid));
 892                 remove_client(remove_state);
 893                 return True;
 894         }
 895
 896         return False;
 897 }
 898
 899 struct winbindd_listen_state {
 900         bool privileged;
 901         int fd;
 902 };
 903
 904 static void winbindd_listen_fde_handler(struct tevent_context *ev,
 905                                         struct tevent_fd *fde,
 906                                         uint16_t flags,
 907                                         void *private_data)
 908 {
 909         struct winbindd_listen_state *s = talloc_get_type_abort(private_data,
 910                                           struct winbindd_listen_state);
 911
 912         while (winbindd_num_clients() >
 913                WINBINDD_MAX_SIMULTANEOUS_CLIENTS - 1) {
 914                 DEBUG(5,("winbindd: Exceeding %d client "
 915                          "connections, removing idle "
 916                          "connection.\n",
 917                          WINBINDD_MAX_SIMULTANEOUS_CLIENTS));
 918                 if (!remove_idle_client()) {
 919                         DEBUG(0,("winbindd: Exceeding %d "
 920                                  "client connections, no idle "
 921                                  "connection found\n",
 922                                  WINBINDD_MAX_SIMULTANEOUS_CLIENTS));
 923                         break;
 924                 }
 925         }
 926         new_connection(s->fd, s->privileged);
 927 }
 928
 929 /*
 930  * Winbindd socket accessor functions
 931  */
 932
 933 const char *get_winbind_pipe_dir(void)
 934 {
 935         return lp_parm_const_string(-1, "winbindd", "socket dir", WINBINDD_SOCKET_DIR);
 936 }
 937
 938 char *get_winbind_priv_pipe_dir(void)
 939 {
 940         return lock_path(WINBINDD_PRIV_SOCKET_SUBDIR);
 941 }
 942
 943 static bool winbindd_setup_listeners(void)
 944 {
 945         struct winbindd_listen_state *pub_state = NULL;
 946         struct winbindd_listen_state *priv_state = NULL;
 947         struct tevent_fd *fde;
 948
 949         pub_state = talloc(winbind_event_context(),
 950                            struct winbindd_listen_state);
 951         if (!pub_state) {
 952                 goto failed;
 953         }
 954
 955         pub_state->privileged = false;
 956         pub_state->fd = create_pipe_sock(
 957                 get_winbind_pipe_dir(), WINBINDD_SOCKET_NAME, 0755);
 958         if (pub_state->fd == -1) {
 959                 goto failed;
 960         }
 961
 962         fde = tevent_add_fd(winbind_event_context(), pub_state, pub_state->fd,
 963                             TEVENT_FD_READ, winbindd_listen_fde_handler,
 964                             pub_state);
 965         if (fde == NULL) {
 966                 close(pub_state->fd);
 967                 goto failed;
 968         }
 969         tevent_fd_set_auto_close(fde);
 970
 971         priv_state = talloc(winbind_event_context(),
 972                             struct winbindd_listen_state);
 973         if (!priv_state) {
 974                 goto failed;
 975         }
 976
 977         priv_state->privileged = true;
 978         priv_state->fd = create_pipe_sock(
 979                 get_winbind_priv_pipe_dir(), WINBINDD_SOCKET_NAME, 0750);
 980         if (priv_state->fd == -1) {
 981                 goto failed;
 982         }
 983
 984         fde = tevent_add_fd(winbind_event_context(), priv_state,
 985                             priv_state->fd, TEVENT_FD_READ,
 986                             winbindd_listen_fde_handler, priv_state);
 987         if (fde == NULL) {
 988                 close(priv_state->fd);
 989                 goto failed;
 990         }
 991         tevent_fd_set_auto_close(fde);
 992
 993         return true;
 994 failed:
 995         TALLOC_FREE(pub_state);
 996         TALLOC_FREE(priv_state);
 997         return false;
 998 }
 999
1000 bool winbindd_use_idmap_cache(void)
1001 {
1002         return !opt_nocache;
1003 }
1004
1005 bool winbindd_use_cache(void)
1006 {
1007         return !opt_nocache;
1008 }
1009
1010 void winbindd_register_handlers(void)
1011 {
1012         struct tevent_timer *te;
1013         /* Setup signal handlers */
1014
1015         if (!winbindd_setup_sig_term_handler(true))
1016                 exit(1);
1017         if (!winbindd_setup_sig_hup_handler(NULL))
1018                 exit(1);
1019         if (!winbindd_setup_sig_chld_handler())
1020                 exit(1);
1021         if (!winbindd_setup_sig_usr2_handler())
1022                 exit(1);
1023
1024         CatchSignal(SIGPIPE, SIG_IGN);                 /* Ignore sigpipe */
1025
1026         /*
1027          * Ensure all cache and idmap caches are consistent
1028          * and initialized before we startup.
1029          */
1030         if (!winbindd_cache_validate_and_initialize()) {
1031                 exit(1);
1032         }
1033
1034         /* get broadcast messages */
1035
1036         if (!serverid_register(procid_self(),
1037                                FLAG_MSG_GENERAL|FLAG_MSG_DBWRAP)) {
1038                 DEBUG(1, ("Could not register myself in serverid.tdb\n"));
1039                 exit(1);
1040         }
1041
1042         /* React on 'smbcontrol winbindd reload-config' in the same way
1043            as to SIGHUP signal */
1044         messaging_register(winbind_messaging_context(), NULL,
1045                            MSG_SMB_CONF_UPDATED, msg_reload_services);
1046         messaging_register(winbind_messaging_context(), NULL,
1047                            MSG_SHUTDOWN, msg_shutdown);
1048
1049         /* Handle online/offline messages. */
1050         messaging_register(winbind_messaging_context(), NULL,
1051                            MSG_WINBIND_OFFLINE, winbind_msg_offline);
1052         messaging_register(winbind_messaging_context(), NULL,
1053                            MSG_WINBIND_ONLINE, winbind_msg_online);
1054         messaging_register(winbind_messaging_context(), NULL,
1055                            MSG_WINBIND_ONLINESTATUS, winbind_msg_onlinestatus);
1056
1057         messaging_register(winbind_messaging_context(), NULL,
1058                            MSG_DUMP_EVENT_LIST, winbind_msg_dump_event_list);
1059
1060         messaging_register(winbind_messaging_context(), NULL,
1061                            MSG_WINBIND_VALIDATE_CACHE,
1062                            winbind_msg_validate_cache);
1063
1064         messaging_register(winbind_messaging_context(), NULL,
1065                            MSG_WINBIND_DUMP_DOMAIN_LIST,
1066                            winbind_msg_dump_domain_list);
1067
1068         /* Register handler for MSG_DEBUG. */
1069         messaging_register(winbind_messaging_context(), NULL,
1070                            MSG_DEBUG,
1071                            winbind_msg_debug);
1072
1073         netsamlogon_cache_init(); /* Non-critical */
1074
1075         /* clear the cached list of trusted domains */
1076
1077         wcache_tdc_clear();
1078
1079         if (!init_domain_list()) {
1080                 DEBUG(0,("unable to initialize domain list\n"));
1081                 exit(1);
1082         }
1083
1084         init_idmap_child();
1085         init_locator_child();
1086
1087         smb_nscd_flush_user_cache();
1088         smb_nscd_flush_group_cache();
1089
1090         te = tevent_add_timer(winbind_event_context(), NULL, timeval_zero(),
1091                               rescan_trusted_domains, NULL);
1092         if (te == NULL) {
1093                 DEBUG(0, ("Could not trigger rescan_trusted_domains()\n"));
1094                 exit(1);
1095         }
1096
1097 }
1098
1099 /* Main function */
1100
1101 int main(int argc, char **argv, char **envp)
1102 {
1103         static bool is_daemon = False;
1104         static bool Fork = True;
1105         static bool log_stdout = False;
1106         static bool no_process_group = False;
1107         enum {
1108                 OPT_DAEMON = 1000,
1109                 OPT_FORK,
1110                 OPT_NO_PROCESS_GROUP,
1111                 OPT_LOG_STDOUT
1112         };
1113         struct poptOption long_options[] = {
1114                 POPT_AUTOHELP
1115                 { "stdout", 'S', POPT_ARG_NONE, NULL, OPT_LOG_STDOUT, "Log to stdout" },
1116                 { "foreground", 'F', POPT_ARG_NONE, NULL, OPT_FORK, "Daemon in foreground mode" },
1117                 { "no-process-group", 0, POPT_ARG_NONE, NULL, OPT_NO_PROCESS_GROUP, "Don't create a new process group" },
1118                 { "daemon", 'D', POPT_ARG_NONE, NULL, OPT_DAEMON, "Become a daemon (default)" },
1119                 { "interactive", 'i', POPT_ARG_NONE, NULL, 'i', "Interactive mode" },
1120                 { "no-caching", 'n', POPT_ARG_NONE, NULL, 'n', "Disable caching" },
1121                 POPT_COMMON_SAMBA
1122                 POPT_TABLEEND
1123         };
1124         poptContext pc;
1125         int opt;
1126         TALLOC_CTX *frame = talloc_stackframe();
1127         NTSTATUS status;
1128
1129         /* glibc (?) likes to print "User defined signal 1" and exit if a
1130            SIGUSR[12] is received before a handler is installed */
1131
1132         CatchSignal(SIGUSR1, SIG_IGN);
1133         CatchSignal(SIGUSR2, SIG_IGN);
1134
1135         fault_setup((void (*)(void *))fault_quit );
1136         dump_core_setup("winbindd");
1137
1138         load_case_tables();
1139
1140         /* Initialise for running in non-root mode */
1141
1142         sec_init();
1143
1144         set_remote_machine_name("winbindd", False);
1145
1146         /* Set environment variable so we don't recursively call ourselves.
1147            This may also be useful interactively. */
1148
1149         if ( !winbind_off() ) {
1150                 DEBUG(0,("Failed to disable recusive winbindd calls.  Exiting.\n"));
1151                 exit(1);
1152         }
1153
1154         /* Initialise samba/rpc client stuff */
1155
1156         pc = poptGetContext("winbindd", argc, (const char **)argv, long_options, 0);
1157
1158         while ((opt = poptGetNextOpt(pc)) != -1) {
1159                 switch (opt) {
1160                         /* Don't become a daemon */
1161                 case OPT_DAEMON:
1162                         is_daemon = True;
1163                         break;
1164                 case 'i':
1165                         interactive = True;
1166                         log_stdout = True;
1167                         Fork = False;
1168                         break;
1169                 case OPT_FORK:
1170                         Fork = false;
1171                         break;
1172                 case OPT_NO_PROCESS_GROUP:
1173                         no_process_group = true;
1174                         break;
1175                 case OPT_LOG_STDOUT:
1176                         log_stdout = true;
1177                         break;
1178                 case 'n':
1179                         opt_nocache = true;
1180                         break;
1181                 default:
1182                         d_fprintf(stderr, "\nInvalid option %s: %s\n\n",
1183                                   poptBadOption(pc, 0), poptStrerror(opt));
1184                         poptPrintUsage(pc, stderr, 0);
1185                         exit(1);
1186                 }
1187         }
1188
1189         if (is_daemon && interactive) {
1190                 d_fprintf(stderr,"\nERROR: "
1191                           "Option -i|--interactive is not allowed together with -D|--daemon\n\n");
1192                 poptPrintUsage(pc, stderr, 0);
1193                 exit(1);
1194         }
1195
1196         if (log_stdout && Fork) {
1197                 d_fprintf(stderr, "\nERROR: "
1198                           "Can't log to stdout (-S) unless daemon is in foreground +(-F) or interactive (-i)\n\n");
1199                 poptPrintUsage(pc, stderr, 0);
1200                 exit(1);
1201         }
1202
1203         poptFreeContext(pc);
1204
1205         if (!override_logfile) {
1206                 char *lfile = NULL;
1207                 if (asprintf(&lfile,"%s/log.winbindd",
1208                                 get_dyn_LOGFILEBASE()) > 0) {
1209                         lp_set_logfile(lfile);
1210                         SAFE_FREE(lfile);
1211                 }
1212         }
1213         setup_logging("winbindd", log_stdout);
1214         reopen_logs();
1215
1216         DEBUG(0,("winbindd version %s started.\n", samba_version_string()));
1217         DEBUGADD(0,("%s\n", COPYRIGHT_STARTUP_MESSAGE));
1218
1219         if (!lp_load_initial_only(get_dyn_CONFIGFILE())) {
1220                 DEBUG(0, ("error opening config file\n"));
1221                 exit(1);
1222         }
1223
1224         /* Initialise messaging system */
1225
1226         if (winbind_messaging_context() == NULL) {
1227                 exit(1);
1228         }
1229
1230         if (!reload_services_file(NULL)) {
1231                 DEBUG(0, ("error opening config file\n"));
1232                 exit(1);
1233         }
1234
1235         if (!directory_exist(lp_lockdir())) {
1236                 mkdir(lp_lockdir(), 0755);
1237         }
1238
1239         /* Setup names. */
1240
1241         if (!init_names())
1242                 exit(1);
1243
1244         load_interfaces();
1245
1246         if (!secrets_init()) {
1247
1248                 DEBUG(0,("Could not initialize domain trust account secrets. Giving up\n"));
1249                 return False;
1250         }
1251
1252         /* Unblock all signals we are interested in as they may have been
1253            blocked by the parent process. */
1254
1255         BlockSignals(False, SIGINT);
1256         BlockSignals(False, SIGQUIT);
1257         BlockSignals(False, SIGTERM);
1258         BlockSignals(False, SIGUSR1);
1259         BlockSignals(False, SIGUSR2);
1260         BlockSignals(False, SIGHUP);
1261         BlockSignals(False, SIGCHLD);
1262
1263         if (!interactive)
1264                 become_daemon(Fork, no_process_group, log_stdout);
1265
1266         pidfile_create("winbindd");
1267
1268 #if HAVE_SETPGID
1269         /*
1270          * If we're interactive we want to set our own process group for
1271          * signal management.
1272          */
1273         if (interactive && !no_process_group)
1274                 setpgid( (pid_t)0, (pid_t)0);
1275 #endif
1276
1277         TimeInit();
1278
1279         /* Don't use winbindd_reinit_after_fork here as
1280          * we're just starting up and haven't created any
1281          * winbindd-specific resources we must free yet. JRA.
1282          */
1283
1284         status = reinit_after_fork(winbind_messaging_context(),
1285                                    winbind_event_context(),
1286                                    procid_self(), false);
1287         if (!NT_STATUS_IS_OK(status)) {
1288                 DEBUG(0,("reinit_after_fork() failed\n"));
1289                 exit(1);
1290         }
1291
1292         winbindd_register_handlers();
1293
1294         rpc_lsarpc_init(NULL);
1295         rpc_samr_init(NULL);
1296
1297         if (!init_system_info()) {
1298                 DEBUG(0,("ERROR: failed to setup system user info.\n"));
1299                 exit(1);
1300         }
1301
1302         /* setup listen sockets */
1303
1304         if (!winbindd_setup_listeners()) {
1305                 DEBUG(0,("winbindd_setup_listeners() failed\n"));
1306                 exit(1);
1307         }
1308
1309         TALLOC_FREE(frame);
1310         /* Loop waiting for requests */
1311         while (1) {
1312                 frame = talloc_stackframe();
1313
1314                 if (tevent_loop_once(winbind_event_context()) == -1) {
1315                         DEBUG(1, ("tevent_loop_once() failed: %s\n",
1316                                   strerror(errno)));
1317                         return 1;
1318                 }
1319
1320                 TALLOC_FREE(frame);
1321         }
1322
1323         return 0;
1324 }