source3/winbindd/winbindd.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3
   4    Winbind daemon for ntdom nss module
   5
   6    Copyright (C) by Tim Potter 2000-2002
   7    Copyright (C) Andrew Tridgell 2002
   8    Copyright (C) Jelmer Vernooij 2003
   9    Copyright (C) Volker Lendecke 2004
  10
  11    This program is free software; you can redistribute it and/or modify
  12    it under the terms of the GNU General Public License as published by
  13    the Free Software Foundation; either version 3 of the License, or
  14    (at your option) any later version.
  15
  16    This program is distributed in the hope that it will be useful,
  17    but WITHOUT ANY WARRANTY; without even the implied warranty of
  18    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19    GNU General Public License for more details.
  20
  21    You should have received a copy of the GNU General Public License
  22    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  23 */
  24
  25 #include "includes.h"
  26 #include "winbindd.h"
  27 #include "../../nsswitch/libwbclient/wbc_async.h"
  28 #include "librpc/gen_ndr/messaging.h"
  29
  30 #undef DBGC_CLASS
  31 #define DBGC_CLASS DBGC_WINBIND
  32
  33 static void remove_client(struct winbindd_cli_state *state);
  34
  35 static bool opt_nocache = False;
  36 static bool interactive = False;
  37
  38 extern bool override_logfile;
  39
  40 /* Reload configuration */
  41
  42 static bool reload_services_file(const char *lfile)
  43 {
  44         bool ret;
  45
  46         if (lp_loaded()) {
  47                 const char *fname = lp_configfile();
  48
  49                 if (file_exist(fname) && !strcsequal(fname,get_dyn_CONFIGFILE())) {
  50                         set_dyn_CONFIGFILE(fname);
  51                 }
  52         }
  53
  54         /* if this is a child, restore the logfile to the special
  55            name - <domain>, idmap, etc. */
  56         if (lfile && *lfile) {
  57                 lp_set_logfile(lfile);
  58         }
  59
  60         reopen_logs();
  61         ret = lp_load(get_dyn_CONFIGFILE(),False,False,True,True);
  62
  63         reopen_logs();
  64         load_interfaces();
  65
  66         return(ret);
  67 }
  68
  69
  70 /**************************************************************************** **
  71  Handle a fault..
  72  **************************************************************************** */
  73
  74 static void fault_quit(void)
  75 {
  76         dump_core();
  77 }
  78
  79 static void winbindd_status(void)
  80 {
  81         struct winbindd_cli_state *tmp;
  82
  83         DEBUG(0, ("winbindd status:\n"));
  84
  85         /* Print client state information */
  86
  87         DEBUG(0, ("\t%d clients currently active\n", winbindd_num_clients()));
  88
  89         if (DEBUGLEVEL >= 2 && winbindd_num_clients()) {
  90                 DEBUG(2, ("\tclient list:\n"));
  91                 for(tmp = winbindd_client_list(); tmp; tmp = tmp->next) {
  92                         DEBUGADD(2, ("\t\tpid %lu, sock %d\n",
  93                                   (unsigned long)tmp->pid, tmp->sock));
  94                 }
  95         }
  96 }
  97
  98 /* Print winbindd status to log file */
  99
 100 static void print_winbindd_status(void)
 101 {
 102         winbindd_status();
 103 }
 104
 105 /* Flush client cache */
 106
 107 static void flush_caches(void)
 108 {
 109         /* We need to invalidate cached user list entries on a SIGHUP
 110            otherwise cached access denied errors due to restrict anonymous
 111            hang around until the sequence number changes. */
 112
 113         if (!wcache_invalidate_cache()) {
 114                 DEBUG(0, ("invalidating the cache failed; revalidate the cache\n"));
 115                 if (!winbindd_cache_validate_and_initialize()) {
 116                         exit(1);
 117                 }
 118         }
 119 }
 120
 121 static void flush_caches_noinit(void)
 122 {
 123         /*
 124          * We need to invalidate cached user list entries on a SIGHUP
 125          * otherwise cached access denied errors due to restrict anonymous
 126          * hang around until the sequence number changes.
 127          * NB
 128          * Skip uninitialized domains when flush cache.
 129          * If domain is not initialized, it means it is never
 130          * used or never become online. look, wcache_invalidate_cache()
 131          * -> get_cache() -> init_dc_connection(). It causes a lot of traffic
 132          * for unused domains and large traffic for primay domain's DC if there
 133          * are many domains..
 134          */
 135
 136         if (!wcache_invalidate_cache_noinit()) {
 137                 DEBUG(0, ("invalidating the cache failed; revalidate the cache\n"));
 138                 if (!winbindd_cache_validate_and_initialize()) {
 139                         exit(1);
 140                 }
 141         }
 142 }
 143
 144 /* Handle the signal by unlinking socket and exiting */
 145
 146 static void terminate(bool is_parent)
 147 {
 148         if (is_parent) {
 149                 /* When parent goes away we should
 150                  * remove the socket file. Not so
 151                  * when children terminate.
 152                  */
 153                 char *path = NULL;
 154
 155                 if (asprintf(&path, "%s/%s",
 156                         get_winbind_pipe_dir(), WINBINDD_SOCKET_NAME) > 0) {
 157                         unlink(path);
 158                         SAFE_FREE(path);
 159                 }
 160         }
 161
 162         idmap_close();
 163
 164         trustdom_cache_shutdown();
 165
 166         gencache_stabilize();
 167
 168 #if 0
 169         if (interactive) {
 170                 TALLOC_CTX *mem_ctx = talloc_init("end_description");
 171                 char *description = talloc_describe_all(mem_ctx);
 172
 173                 DEBUG(3, ("tallocs left:\n%s\n", description));
 174                 talloc_destroy(mem_ctx);
 175         }
 176 #endif
 177
 178         if (is_parent) {
 179                 serverid_deregister_self();
 180                 pidfile_unlink();
 181         }
 182
 183         exit(0);
 184 }
 185
 186 static void winbindd_sig_term_handler(struct tevent_context *ev,
 187                                       struct tevent_signal *se,
 188                                       int signum,
 189                                       int count,
 190                                       void *siginfo,
 191                                       void *private_data)
 192 {
 193         bool *is_parent = talloc_get_type_abort(private_data, bool);
 194
 195         DEBUG(0,("Got sig[%d] terminate (is_parent=%d)\n",
 196                  signum, (int)*is_parent));
 197         terminate(*is_parent);
 198 }
 199
 200 bool winbindd_setup_sig_term_handler(bool parent)
 201 {
 202         struct tevent_signal *se;
 203         bool *is_parent;
 204
 205         is_parent = talloc(winbind_event_context(), bool);
 206         if (!is_parent) {
 207                 return false;
 208         }
 209
 210         *is_parent = parent;
 211
 212         se = tevent_add_signal(winbind_event_context(),
 213                                is_parent,
 214                                SIGTERM, 0,
 215                                winbindd_sig_term_handler,
 216                                is_parent);
 217         if (!se) {
 218                 DEBUG(0,("failed to setup SIGTERM handler"));
 219                 talloc_free(is_parent);
 220                 return false;
 221         }
 222
 223         se = tevent_add_signal(winbind_event_context(),
 224                                is_parent,
 225                                SIGINT, 0,
 226                                winbindd_sig_term_handler,
 227                                is_parent);
 228         if (!se) {
 229                 DEBUG(0,("failed to setup SIGINT handler"));
 230                 talloc_free(is_parent);
 231                 return false;
 232         }
 233
 234         se = tevent_add_signal(winbind_event_context(),
 235                                is_parent,
 236                                SIGQUIT, 0,
 237                                winbindd_sig_term_handler,
 238                                is_parent);
 239         if (!se) {
 240                 DEBUG(0,("failed to setup SIGINT handler"));
 241                 talloc_free(is_parent);
 242                 return false;
 243         }
 244
 245         return true;
 246 }
 247
 248 static void winbindd_sig_hup_handler(struct tevent_context *ev,
 249                                      struct tevent_signal *se,
 250                                      int signum,
 251                                      int count,
 252                                      void *siginfo,
 253                                      void *private_data)
 254 {
 255         const char *file = (const char *)private_data;
 256
 257         DEBUG(1,("Reloading services after SIGHUP\n"));
 258         flush_caches_noinit();
 259         reload_services_file(file);
 260 }
 261
 262 bool winbindd_setup_sig_hup_handler(const char *lfile)
 263 {
 264         struct tevent_signal *se;
 265         char *file = NULL;
 266
 267         if (lfile) {
 268                 file = talloc_strdup(winbind_event_context(),
 269                                      lfile);
 270                 if (!file) {
 271                         return false;
 272                 }
 273         }
 274
 275         se = tevent_add_signal(winbind_event_context(),
 276                                winbind_event_context(),
 277                                SIGHUP, 0,
 278                                winbindd_sig_hup_handler,
 279                                file);
 280         if (!se) {
 281                 return false;
 282         }
 283
 284         return true;
 285 }
 286
 287 static void winbindd_sig_chld_handler(struct tevent_context *ev,
 288                                       struct tevent_signal *se,
 289                                       int signum,
 290                                       int count,
 291                                       void *siginfo,
 292                                       void *private_data)
 293 {
 294         pid_t pid;
 295
 296         while ((pid = sys_waitpid(-1, NULL, WNOHANG)) > 0) {
 297                 winbind_child_died(pid);
 298         }
 299 }
 300
 301 static bool winbindd_setup_sig_chld_handler(void)
 302 {
 303         struct tevent_signal *se;
 304
 305         se = tevent_add_signal(winbind_event_context(),
 306                                winbind_event_context(),
 307                                SIGCHLD, 0,
 308                                winbindd_sig_chld_handler,
 309                                NULL);
 310         if (!se) {
 311                 return false;
 312         }
 313
 314         return true;
 315 }
 316
 317 static void winbindd_sig_usr2_handler(struct tevent_context *ev,
 318                                       struct tevent_signal *se,
 319                                       int signum,
 320                                       int count,
 321                                       void *siginfo,
 322                                       void *private_data)
 323 {
 324         print_winbindd_status();
 325 }
 326
 327 static bool winbindd_setup_sig_usr2_handler(void)
 328 {
 329         struct tevent_signal *se;
 330
 331         se = tevent_add_signal(winbind_event_context(),
 332                                winbind_event_context(),
 333                                SIGUSR2, 0,
 334                                winbindd_sig_usr2_handler,
 335                                NULL);
 336         if (!se) {
 337                 return false;
 338         }
 339
 340         return true;
 341 }
 342
 343 /* React on 'smbcontrol winbindd reload-config' in the same way as on SIGHUP*/
 344 static void msg_reload_services(struct messaging_context *msg,
 345                                 void *private_data,
 346                                 uint32_t msg_type,
 347                                 struct server_id server_id,
 348                                 DATA_BLOB *data)
 349 {
 350         /* Flush various caches */
 351         flush_caches();
 352         reload_services_file((const char *) private_data);
 353 }
 354
 355 /* React on 'smbcontrol winbindd shutdown' in the same way as on SIGTERM*/
 356 static void msg_shutdown(struct messaging_context *msg,
 357                          void *private_data,
 358                          uint32_t msg_type,
 359                          struct server_id server_id,
 360                          DATA_BLOB *data)
 361 {
 362         /* only the parent waits for this message */
 363         DEBUG(0,("Got shutdown message\n"));
 364         terminate(true);
 365 }
 366
 367
 368 static void winbind_msg_validate_cache(struct messaging_context *msg_ctx,
 369                                        void *private_data,
 370                                        uint32_t msg_type,
 371                                        struct server_id server_id,
 372                                        DATA_BLOB *data)
 373 {
 374         uint8 ret;
 375         pid_t child_pid;
 376
 377         DEBUG(10, ("winbindd_msg_validate_cache: got validate-cache "
 378                    "message.\n"));
 379
 380         /*
 381          * call the validation code from a child:
 382          * so we don't block the main winbindd and the validation
 383          * code can safely use fork/waitpid...
 384          */
 385         child_pid = sys_fork();
 386
 387         if (child_pid == -1) {
 388                 DEBUG(1, ("winbind_msg_validate_cache: Could not fork: %s\n",
 389                           strerror(errno)));
 390                 return;
 391         }
 392
 393         if (child_pid != 0) {
 394                 /* parent */
 395                 DEBUG(5, ("winbind_msg_validate_cache: child created with "
 396                           "pid %d.\n", (int)child_pid));
 397                 return;
 398         }
 399
 400         /* child */
 401
 402         if (!winbindd_reinit_after_fork(NULL)) {
 403                 _exit(0);
 404         }
 405
 406         /* install default SIGCHLD handler: validation code uses fork/waitpid */
 407         CatchSignal(SIGCHLD, SIG_DFL);
 408
 409         ret = (uint8)winbindd_validate_cache_nobackup();
 410         DEBUG(10, ("winbindd_msg_validata_cache: got return value %d\n", ret));
 411         messaging_send_buf(msg_ctx, server_id, MSG_WINBIND_VALIDATE_CACHE, &ret,
 412                            (size_t)1);
 413         _exit(0);
 414 }
 415
 416 static struct winbindd_dispatch_table {
 417         enum winbindd_cmd cmd;
 418         void (*fn)(struct winbindd_cli_state *state);
 419         const char *winbindd_cmd_name;
 420 } dispatch_table[] = {
 421
 422         /* Enumeration functions */
 423
 424         { WINBINDD_LIST_TRUSTDOM, winbindd_list_trusted_domains,
 425           "LIST_TRUSTDOM" },
 426
 427         /* Miscellaneous */
 428
 429         { WINBINDD_INFO, winbindd_info, "INFO" },
 430         { WINBINDD_INTERFACE_VERSION, winbindd_interface_version,
 431           "INTERFACE_VERSION" },
 432         { WINBINDD_DOMAIN_NAME, winbindd_domain_name, "DOMAIN_NAME" },
 433         { WINBINDD_DOMAIN_INFO, winbindd_domain_info, "DOMAIN_INFO" },
 434         { WINBINDD_NETBIOS_NAME, winbindd_netbios_name, "NETBIOS_NAME" },
 435         { WINBINDD_PRIV_PIPE_DIR, winbindd_priv_pipe_dir,
 436           "WINBINDD_PRIV_PIPE_DIR" },
 437
 438         /* Credential cache access */
 439         { WINBINDD_CCACHE_NTLMAUTH, winbindd_ccache_ntlm_auth, "NTLMAUTH" },
 440         { WINBINDD_CCACHE_SAVE, winbindd_ccache_save, "CCACHE_SAVE" },
 441
 442         /* WINS functions */
 443
 444         { WINBINDD_WINS_BYNAME, winbindd_wins_byname, "WINS_BYNAME" },
 445         { WINBINDD_WINS_BYIP, winbindd_wins_byip, "WINS_BYIP" },
 446
 447         /* End of list */
 448
 449         { WINBINDD_NUM_CMDS, NULL, "NONE" }
 450 };
 451
 452 struct winbindd_async_dispatch_table {
 453         enum winbindd_cmd cmd;
 454         const char *cmd_name;
 455         struct tevent_req *(*send_req)(TALLOC_CTX *mem_ctx,
 456                                        struct tevent_context *ev,
 457                                        struct winbindd_cli_state *cli,
 458                                        struct winbindd_request *request);
 459         NTSTATUS (*recv_req)(struct tevent_req *req,
 460                              struct winbindd_response *presp);
 461 };
 462
 463 static struct winbindd_async_dispatch_table async_nonpriv_table[] = {
 464         { WINBINDD_PING, "PING",
 465           wb_ping_send, wb_ping_recv },
 466         { WINBINDD_LOOKUPSID, "LOOKUPSID",
 467           winbindd_lookupsid_send, winbindd_lookupsid_recv },
 468         { WINBINDD_LOOKUPNAME, "LOOKUPNAME",
 469           winbindd_lookupname_send, winbindd_lookupname_recv },
 470         { WINBINDD_SID_TO_UID, "SID_TO_UID",
 471           winbindd_sid_to_uid_send, winbindd_sid_to_uid_recv },
 472         { WINBINDD_SID_TO_GID, "SID_TO_GID",
 473           winbindd_sid_to_gid_send, winbindd_sid_to_gid_recv },
 474         { WINBINDD_UID_TO_SID, "UID_TO_SID",
 475           winbindd_uid_to_sid_send, winbindd_uid_to_sid_recv },
 476         { WINBINDD_GID_TO_SID, "GID_TO_SID",
 477           winbindd_gid_to_sid_send, winbindd_gid_to_sid_recv },
 478         { WINBINDD_GETPWSID, "GETPWSID",
 479           winbindd_getpwsid_send, winbindd_getpwsid_recv },
 480         { WINBINDD_GETPWNAM, "GETPWNAM",
 481           winbindd_getpwnam_send, winbindd_getpwnam_recv },
 482         { WINBINDD_GETPWUID, "GETPWUID",
 483           winbindd_getpwuid_send, winbindd_getpwuid_recv },
 484         { WINBINDD_GETSIDALIASES, "GETSIDALIASES",
 485           winbindd_getsidaliases_send, winbindd_getsidaliases_recv },
 486         { WINBINDD_GETUSERDOMGROUPS, "GETUSERDOMGROUPS",
 487           winbindd_getuserdomgroups_send, winbindd_getuserdomgroups_recv },
 488         { WINBINDD_GETGROUPS, "GETGROUPS",
 489           winbindd_getgroups_send, winbindd_getgroups_recv },
 490         { WINBINDD_SHOW_SEQUENCE, "SHOW_SEQUENCE",
 491           winbindd_show_sequence_send, winbindd_show_sequence_recv },
 492         { WINBINDD_GETGRGID, "GETGRGID",
 493           winbindd_getgrgid_send, winbindd_getgrgid_recv },
 494         { WINBINDD_GETGRNAM, "GETGRNAM",
 495           winbindd_getgrnam_send, winbindd_getgrnam_recv },
 496         { WINBINDD_GETUSERSIDS, "GETUSERSIDS",
 497           winbindd_getusersids_send, winbindd_getusersids_recv },
 498         { WINBINDD_LOOKUPRIDS, "LOOKUPRIDS",
 499           winbindd_lookuprids_send, winbindd_lookuprids_recv },
 500         { WINBINDD_SETPWENT, "SETPWENT",
 501           winbindd_setpwent_send, winbindd_setpwent_recv },
 502         { WINBINDD_GETPWENT, "GETPWENT",
 503           winbindd_getpwent_send, winbindd_getpwent_recv },
 504         { WINBINDD_ENDPWENT, "ENDPWENT",
 505           winbindd_endpwent_send, winbindd_endpwent_recv },
 506         { WINBINDD_DSGETDCNAME, "DSGETDCNAME",
 507           winbindd_dsgetdcname_send, winbindd_dsgetdcname_recv },
 508         { WINBINDD_GETDCNAME, "GETDCNAME",
 509           winbindd_getdcname_send, winbindd_getdcname_recv },
 510         { WINBINDD_SETGRENT, "SETGRENT",
 511           winbindd_setgrent_send, winbindd_setgrent_recv },
 512         { WINBINDD_GETGRENT, "GETGRENT",
 513           winbindd_getgrent_send, winbindd_getgrent_recv },
 514         { WINBINDD_ENDGRENT, "ENDGRENT",
 515           winbindd_endgrent_send, winbindd_endgrent_recv },
 516         { WINBINDD_LIST_USERS, "LIST_USERS",
 517           winbindd_list_users_send, winbindd_list_users_recv },
 518         { WINBINDD_LIST_GROUPS, "LIST_GROUPS",
 519           winbindd_list_groups_send, winbindd_list_groups_recv },
 520         { WINBINDD_CHECK_MACHACC, "CHECK_MACHACC",
 521           winbindd_check_machine_acct_send, winbindd_check_machine_acct_recv },
 522         { WINBINDD_PING_DC, "PING_DC",
 523           winbindd_ping_dc_send, winbindd_ping_dc_recv },
 524         { WINBINDD_PAM_AUTH, "PAM_AUTH",
 525           winbindd_pam_auth_send, winbindd_pam_auth_recv },
 526         { WINBINDD_PAM_LOGOFF, "PAM_LOGOFF",
 527           winbindd_pam_logoff_send, winbindd_pam_logoff_recv },
 528         { WINBINDD_PAM_CHAUTHTOK, "PAM_CHAUTHTOK",
 529           winbindd_pam_chauthtok_send, winbindd_pam_chauthtok_recv },
 530         { WINBINDD_PAM_CHNG_PSWD_AUTH_CRAP, "PAM_CHNG_PSWD_AUTH_CRAP",
 531           winbindd_pam_chng_pswd_auth_crap_send,
 532           winbindd_pam_chng_pswd_auth_crap_recv },
 533
 534         { 0, NULL, NULL, NULL }
 535 };
 536
 537 static struct winbindd_async_dispatch_table async_priv_table[] = {
 538         { WINBINDD_ALLOCATE_UID, "ALLOCATE_UID",
 539           winbindd_allocate_uid_send, winbindd_allocate_uid_recv },
 540         { WINBINDD_ALLOCATE_GID, "ALLOCATE_GID",
 541           winbindd_allocate_gid_send, winbindd_allocate_gid_recv },
 542         { WINBINDD_SET_MAPPING, "SET_MAPPING",
 543           winbindd_set_mapping_send, winbindd_set_mapping_recv },
 544         { WINBINDD_REMOVE_MAPPING, "SET_MAPPING",
 545           winbindd_remove_mapping_send, winbindd_remove_mapping_recv },
 546         { WINBINDD_SET_HWM, "SET_HWM",
 547           winbindd_set_hwm_send, winbindd_set_hwm_recv },
 548         { WINBINDD_CHANGE_MACHACC, "CHANGE_MACHACC",
 549           winbindd_change_machine_acct_send, winbindd_change_machine_acct_recv },
 550         { WINBINDD_PAM_AUTH_CRAP, "PAM_AUTH_CRAP",
 551           winbindd_pam_auth_crap_send, winbindd_pam_auth_crap_recv },
 552
 553         { 0, NULL, NULL, NULL }
 554 };
 555
 556 static void wb_request_done(struct tevent_req *req);
 557
 558 static void process_request(struct winbindd_cli_state *state)
 559 {
 560         struct winbindd_dispatch_table *table = dispatch_table;
 561         struct winbindd_async_dispatch_table *atable;
 562
 563         state->mem_ctx = talloc_named(state, 0, "winbind request");
 564         if (state->mem_ctx == NULL)
 565                 return;
 566
 567         /* Remember who asked us. */
 568         state->pid = state->request->pid;
 569
 570         state->cmd_name = "unknown request";
 571         state->recv_fn = NULL;
 572
 573         /* Process command */
 574
 575         for (atable = async_nonpriv_table; atable->send_req; atable += 1) {
 576                 if (state->request->cmd == atable->cmd) {
 577                         break;
 578                 }
 579         }
 580
 581         if ((atable->send_req == NULL) && state->privileged) {
 582                 for (atable = async_priv_table; atable->send_req;
 583                      atable += 1) {
 584                         if (state->request->cmd == atable->cmd) {
 585                                 break;
 586                         }
 587                 }
 588         }
 589
 590         if (atable->send_req != NULL) {
 591                 struct tevent_req *req;
 592
 593                 state->cmd_name = atable->cmd_name;
 594                 state->recv_fn = atable->recv_req;
 595
 596                 DEBUG(10, ("process_request: Handling async request %d:%s\n",
 597                            (int)state->pid, state->cmd_name));
 598
 599                 req = atable->send_req(state->mem_ctx, winbind_event_context(),
 600                                        state, state->request);
 601                 if (req == NULL) {
 602                         DEBUG(0, ("process_request: atable->send failed for "
 603                                   "%s\n", atable->cmd_name));
 604                         request_error(state);
 605                         return;
 606                 }
 607                 tevent_req_set_callback(req, wb_request_done, state);
 608                 return;
 609         }
 610
 611         state->response = talloc_zero(state->mem_ctx,
 612                                       struct winbindd_response);
 613         if (state->response == NULL) {
 614                 DEBUG(10, ("talloc failed\n"));
 615                 remove_client(state);
 616                 return;
 617         }
 618         state->response->result = WINBINDD_PENDING;
 619         state->response->length = sizeof(struct winbindd_response);
 620
 621         for (table = dispatch_table; table->fn; table++) {
 622                 if (state->request->cmd == table->cmd) {
 623                         DEBUG(10,("process_request: request fn %s\n",
 624                                   table->winbindd_cmd_name ));
 625                         state->cmd_name = table->winbindd_cmd_name;
 626                         table->fn(state);
 627                         break;
 628                 }
 629         }
 630
 631         if (!table->fn) {
 632                 DEBUG(10,("process_request: unknown request fn number %d\n",
 633                           (int)state->request->cmd ));
 634                 request_error(state);
 635         }
 636 }
 637
 638 static void wb_request_done(struct tevent_req *req)
 639 {
 640         struct winbindd_cli_state *state = tevent_req_callback_data(
 641                 req, struct winbindd_cli_state);
 642         NTSTATUS status;
 643
 644         state->response = talloc_zero(state->mem_ctx,
 645                                       struct winbindd_response);
 646         if (state->response == NULL) {
 647                 DEBUG(0, ("wb_request_done[%d:%s]: talloc_zero failed - removing client\n",
 648                           (int)state->pid, state->cmd_name));
 649                 remove_client(state);
 650                 return;
 651         }
 652         state->response->result = WINBINDD_PENDING;
 653         state->response->length = sizeof(struct winbindd_response);
 654
 655         status = state->recv_fn(req, state->response);
 656         TALLOC_FREE(req);
 657
 658         DEBUG(10,("wb_request_done[%d:%s]: %s\n",
 659                   (int)state->pid, state->cmd_name, nt_errstr(status)));
 660
 661         if (!NT_STATUS_IS_OK(status)) {
 662                 request_error(state);
 663                 return;
 664         }
 665         request_ok(state);
 666 }
 667
 668 /*
 669  * This is the main event loop of winbind requests. It goes through a
 670  * state-machine of 3 read/write requests, 4 if you have extra data to send.
 671  *
 672  * An idle winbind client has a read request of 4 bytes outstanding,
 673  * finalizing function is request_len_recv, checking the length. request_recv
 674  * then processes the packet. The processing function then at some point has
 675  * to call request_finished which schedules sending the response.
 676  */
 677
 678 static void request_finished(struct winbindd_cli_state *state);
 679
 680 static void winbind_client_request_read(struct tevent_req *req);
 681 static void winbind_client_response_written(struct tevent_req *req);
 682
 683 static void request_finished(struct winbindd_cli_state *state)
 684 {
 685         struct tevent_req *req;
 686
 687         TALLOC_FREE(state->request);
 688
 689         req = wb_resp_write_send(state, winbind_event_context(),
 690                                  state->out_queue, state->sock,
 691                                  state->response);
 692         if (req == NULL) {
 693                 DEBUG(10,("request_finished[%d:%s]: wb_resp_write_send() failed\n",
 694                           (int)state->pid, state->cmd_name));
 695                 remove_client(state);
 696                 return;
 697         }
 698         tevent_req_set_callback(req, winbind_client_response_written, state);
 699 }
 700
 701 static void winbind_client_response_written(struct tevent_req *req)
 702 {
 703         struct winbindd_cli_state *state = tevent_req_callback_data(
 704                 req, struct winbindd_cli_state);
 705         ssize_t ret;
 706         int err;
 707
 708         ret = wb_resp_write_recv(req, &err);
 709         TALLOC_FREE(req);
 710         if (ret == -1) {
 711                 close(state->sock);
 712                 state->sock = -1;
 713                 DEBUG(2, ("Could not write response[%d:%s] to client: %s\n",
 714                           (int)state->pid, state->cmd_name, strerror(err)));
 715                 remove_client(state);
 716                 return;
 717         }
 718
 719         DEBUG(10,("winbind_client_response_written[%d:%s]: delivered response "
 720                   "to client\n", (int)state->pid, state->cmd_name));
 721
 722         TALLOC_FREE(state->mem_ctx);
 723         state->response = NULL;
 724         state->cmd_name = "no request";
 725         state->recv_fn = NULL;
 726
 727         req = wb_req_read_send(state, winbind_event_context(), state->sock,
 728                                WINBINDD_MAX_EXTRA_DATA);
 729         if (req == NULL) {
 730                 remove_client(state);
 731                 return;
 732         }
 733         tevent_req_set_callback(req, winbind_client_request_read, state);
 734 }
 735
 736 void request_error(struct winbindd_cli_state *state)
 737 {
 738         SMB_ASSERT(state->response->result == WINBINDD_PENDING);
 739         state->response->result = WINBINDD_ERROR;
 740         request_finished(state);
 741 }
 742
 743 void request_ok(struct winbindd_cli_state *state)
 744 {
 745         SMB_ASSERT(state->response->result == WINBINDD_PENDING);
 746         state->response->result = WINBINDD_OK;
 747         request_finished(state);
 748 }
 749
 750 /* Process a new connection by adding it to the client connection list */
 751
 752 static void new_connection(int listen_sock, bool privileged)
 753 {
 754         struct sockaddr_un sunaddr;
 755         struct winbindd_cli_state *state;
 756         struct tevent_req *req;
 757         socklen_t len;
 758         int sock;
 759
 760         /* Accept connection */
 761
 762         len = sizeof(sunaddr);
 763
 764         do {
 765                 sock = accept(listen_sock, (struct sockaddr *)(void *)&sunaddr,
 766                               &len);
 767         } while (sock == -1 && errno == EINTR);
 768
 769         if (sock == -1)
 770                 return;
 771
 772         DEBUG(6,("accepted socket %d\n", sock));
 773
 774         /* Create new connection structure */
 775
 776         if ((state = TALLOC_ZERO_P(NULL, struct winbindd_cli_state)) == NULL) {
 777                 close(sock);
 778                 return;
 779         }
 780
 781         state->sock = sock;
 782
 783         state->out_queue = tevent_queue_create(state, "winbind client reply");
 784         if (state->out_queue == NULL) {
 785                 close(sock);
 786                 TALLOC_FREE(state);
 787                 return;
 788         }
 789
 790         state->last_access = time(NULL);
 791
 792         state->privileged = privileged;
 793
 794         req = wb_req_read_send(state, winbind_event_context(), state->sock,
 795                                WINBINDD_MAX_EXTRA_DATA);
 796         if (req == NULL) {
 797                 TALLOC_FREE(state);
 798                 close(sock);
 799                 return;
 800         }
 801         tevent_req_set_callback(req, winbind_client_request_read, state);
 802
 803         /* Add to connection list */
 804
 805         winbindd_add_client(state);
 806 }
 807
 808 static void winbind_client_request_read(struct tevent_req *req)
 809 {
 810         struct winbindd_cli_state *state = tevent_req_callback_data(
 811                 req, struct winbindd_cli_state);
 812         ssize_t ret;
 813         int err;
 814
 815         ret = wb_req_read_recv(req, state, &state->request, &err);
 816         TALLOC_FREE(req);
 817         if (ret == -1) {
 818                 if (err == EPIPE) {
 819                         DEBUG(6, ("closing socket %d, client exited\n",
 820                                   state->sock));
 821                 } else {
 822                         DEBUG(2, ("Could not read client request from fd %d: "
 823                                   "%s\n", state->sock, strerror(err)));
 824                 }
 825                 close(state->sock);
 826                 state->sock = -1;
 827                 remove_client(state);
 828                 return;
 829         }
 830         process_request(state);
 831 }
 832
 833 /* Remove a client connection from client connection list */
 834
 835 static void remove_client(struct winbindd_cli_state *state)
 836 {
 837         char c = 0;
 838         int nwritten;
 839
 840         /* It's a dead client - hold a funeral */
 841
 842         if (state == NULL) {
 843                 return;
 844         }
 845
 846         if (state->sock != -1) {
 847                 /* tell client, we are closing ... */
 848                 nwritten = write(state->sock, &c, sizeof(c));
 849                 if (nwritten == -1) {
 850                         DEBUG(2, ("final write to client failed: %s\n",
 851                                 strerror(errno)));
 852                 }
 853
 854                 /* Close socket */
 855
 856                 close(state->sock);
 857                 state->sock = -1;
 858         }
 859
 860         TALLOC_FREE(state->mem_ctx);
 861
 862         /* Remove from list and free */
 863
 864         winbindd_remove_client(state);
 865         TALLOC_FREE(state);
 866 }
 867
 868 /* Shutdown client connection which has been idle for the longest time */
 869
 870 static bool remove_idle_client(void)
 871 {
 872         struct winbindd_cli_state *state, *remove_state = NULL;
 873         time_t last_access = 0;
 874         int nidle = 0;
 875
 876         for (state = winbindd_client_list(); state; state = state->next) {
 877                 if (state->response == NULL &&
 878                     !state->pwent_state && !state->grent_state) {
 879                         nidle++;
 880                         if (!last_access || state->last_access < last_access) {
 881                                 last_access = state->last_access;
 882                                 remove_state = state;
 883                         }
 884                 }
 885         }
 886
 887         if (remove_state) {
 888                 DEBUG(5,("Found %d idle client connections, shutting down sock %d, pid %u\n",
 889                         nidle, remove_state->sock, (unsigned int)remove_state->pid));
 890                 remove_client(remove_state);
 891                 return True;
 892         }
 893
 894         return False;
 895 }
 896
 897 struct winbindd_listen_state {
 898         bool privileged;
 899         int fd;
 900 };
 901
 902 static void winbindd_listen_fde_handler(struct tevent_context *ev,
 903                                         struct tevent_fd *fde,
 904                                         uint16_t flags,
 905                                         void *private_data)
 906 {
 907         struct winbindd_listen_state *s = talloc_get_type_abort(private_data,
 908                                           struct winbindd_listen_state);
 909
 910         while (winbindd_num_clients() >
 911                WINBINDD_MAX_SIMULTANEOUS_CLIENTS - 1) {
 912                 DEBUG(5,("winbindd: Exceeding %d client "
 913                          "connections, removing idle "
 914                          "connection.\n",
 915                          WINBINDD_MAX_SIMULTANEOUS_CLIENTS));
 916                 if (!remove_idle_client()) {
 917                         DEBUG(0,("winbindd: Exceeding %d "
 918                                  "client connections, no idle "
 919                                  "connection found\n",
 920                                  WINBINDD_MAX_SIMULTANEOUS_CLIENTS));
 921                         break;
 922                 }
 923         }
 924         new_connection(s->fd, s->privileged);
 925 }
 926
 927 /*
 928  * Winbindd socket accessor functions
 929  */
 930
 931 const char *get_winbind_pipe_dir(void)
 932 {
 933         return lp_parm_const_string(-1, "winbindd", "socket dir", WINBINDD_SOCKET_DIR);
 934 }
 935
 936 char *get_winbind_priv_pipe_dir(void)
 937 {
 938         return lock_path(WINBINDD_PRIV_SOCKET_SUBDIR);
 939 }
 940
 941 static bool winbindd_setup_listeners(void)
 942 {
 943         struct winbindd_listen_state *pub_state = NULL;
 944         struct winbindd_listen_state *priv_state = NULL;
 945         struct tevent_fd *fde;
 946
 947         pub_state = talloc(winbind_event_context(),
 948                            struct winbindd_listen_state);
 949         if (!pub_state) {
 950                 goto failed;
 951         }
 952
 953         pub_state->privileged = false;
 954         pub_state->fd = create_pipe_sock(
 955                 get_winbind_pipe_dir(), WINBINDD_SOCKET_NAME, 0755);
 956         if (pub_state->fd == -1) {
 957                 goto failed;
 958         }
 959
 960         fde = tevent_add_fd(winbind_event_context(), pub_state, pub_state->fd,
 961                             TEVENT_FD_READ, winbindd_listen_fde_handler,
 962                             pub_state);
 963         if (fde == NULL) {
 964                 close(pub_state->fd);
 965                 goto failed;
 966         }
 967         tevent_fd_set_auto_close(fde);
 968
 969         priv_state = talloc(winbind_event_context(),
 970                             struct winbindd_listen_state);
 971         if (!priv_state) {
 972                 goto failed;
 973         }
 974
 975         priv_state->privileged = true;
 976         priv_state->fd = create_pipe_sock(
 977                 get_winbind_priv_pipe_dir(), WINBINDD_SOCKET_NAME, 0750);
 978         if (priv_state->fd == -1) {
 979                 goto failed;
 980         }
 981
 982         fde = tevent_add_fd(winbind_event_context(), priv_state,
 983                             priv_state->fd, TEVENT_FD_READ,
 984                             winbindd_listen_fde_handler, priv_state);
 985         if (fde == NULL) {
 986                 close(priv_state->fd);
 987                 goto failed;
 988         }
 989         tevent_fd_set_auto_close(fde);
 990
 991         return true;
 992 failed:
 993         TALLOC_FREE(pub_state);
 994         TALLOC_FREE(priv_state);
 995         return false;
 996 }
 997
 998 bool winbindd_use_idmap_cache(void)
 999 {
1000         return !opt_nocache;
1001 }
1002
1003 bool winbindd_use_cache(void)
1004 {
1005         return !opt_nocache;
1006 }
1007
1008 void winbindd_register_handlers(void)
1009 {
1010         struct tevent_timer *te;
1011         /* Setup signal handlers */
1012
1013         if (!winbindd_setup_sig_term_handler(true))
1014                 exit(1);
1015         if (!winbindd_setup_sig_hup_handler(NULL))
1016                 exit(1);
1017         if (!winbindd_setup_sig_chld_handler())
1018                 exit(1);
1019         if (!winbindd_setup_sig_usr2_handler())
1020                 exit(1);
1021
1022         CatchSignal(SIGPIPE, SIG_IGN);                 /* Ignore sigpipe */
1023
1024         /*
1025          * Ensure all cache and idmap caches are consistent
1026          * and initialized before we startup.
1027          */
1028         if (!winbindd_cache_validate_and_initialize()) {
1029                 exit(1);
1030         }
1031
1032         /* get broadcast messages */
1033
1034         if (!serverid_register_self(FLAG_MSG_GENERAL|FLAG_MSG_DBWRAP)) {
1035                 DEBUG(1, ("Could not register myself in serverid.tdb\n"));
1036                 exit(1);
1037         }
1038
1039         /* React on 'smbcontrol winbindd reload-config' in the same way
1040            as to SIGHUP signal */
1041         messaging_register(winbind_messaging_context(), NULL,
1042                            MSG_SMB_CONF_UPDATED, msg_reload_services);
1043         messaging_register(winbind_messaging_context(), NULL,
1044                            MSG_SHUTDOWN, msg_shutdown);
1045
1046         /* Handle online/offline messages. */
1047         messaging_register(winbind_messaging_context(), NULL,
1048                            MSG_WINBIND_OFFLINE, winbind_msg_offline);
1049         messaging_register(winbind_messaging_context(), NULL,
1050                            MSG_WINBIND_ONLINE, winbind_msg_online);
1051         messaging_register(winbind_messaging_context(), NULL,
1052                            MSG_WINBIND_ONLINESTATUS, winbind_msg_onlinestatus);
1053
1054         messaging_register(winbind_messaging_context(), NULL,
1055                            MSG_DUMP_EVENT_LIST, winbind_msg_dump_event_list);
1056
1057         messaging_register(winbind_messaging_context(), NULL,
1058                            MSG_WINBIND_VALIDATE_CACHE,
1059                            winbind_msg_validate_cache);
1060
1061         messaging_register(winbind_messaging_context(), NULL,
1062                            MSG_WINBIND_DUMP_DOMAIN_LIST,
1063                            winbind_msg_dump_domain_list);
1064
1065         /* Register handler for MSG_DEBUG. */
1066         messaging_register(winbind_messaging_context(), NULL,
1067                            MSG_DEBUG,
1068                            winbind_msg_debug);
1069
1070         netsamlogon_cache_init(); /* Non-critical */
1071
1072         /* clear the cached list of trusted domains */
1073
1074         wcache_tdc_clear();
1075
1076         if (!init_domain_list()) {
1077                 DEBUG(0,("unable to initialize domain list\n"));
1078                 exit(1);
1079         }
1080
1081         init_idmap_child();
1082         init_locator_child();
1083
1084         smb_nscd_flush_user_cache();
1085         smb_nscd_flush_group_cache();
1086
1087         te = tevent_add_timer(winbind_event_context(), NULL, timeval_zero(),
1088                               rescan_trusted_domains, NULL);
1089         if (te == NULL) {
1090                 DEBUG(0, ("Could not trigger rescan_trusted_domains()\n"));
1091                 exit(1);
1092         }
1093
1094 }
1095
1096 /* Main function */
1097
1098 int main(int argc, char **argv, char **envp)
1099 {
1100         static bool is_daemon = False;
1101         static bool Fork = True;
1102         static bool log_stdout = False;
1103         static bool no_process_group = False;
1104         enum {
1105                 OPT_DAEMON = 1000,
1106                 OPT_FORK,
1107                 OPT_NO_PROCESS_GROUP,
1108                 OPT_LOG_STDOUT
1109         };
1110         struct poptOption long_options[] = {
1111                 POPT_AUTOHELP
1112                 { "stdout", 'S', POPT_ARG_NONE, NULL, OPT_LOG_STDOUT, "Log to stdout" },
1113                 { "foreground", 'F', POPT_ARG_NONE, NULL, OPT_FORK, "Daemon in foreground mode" },
1114                 { "no-process-group", 0, POPT_ARG_NONE, NULL, OPT_NO_PROCESS_GROUP, "Don't create a new process group" },
1115                 { "daemon", 'D', POPT_ARG_NONE, NULL, OPT_DAEMON, "Become a daemon (default)" },
1116                 { "interactive", 'i', POPT_ARG_NONE, NULL, 'i', "Interactive mode" },
1117                 { "no-caching", 'n', POPT_ARG_NONE, NULL, 'n', "Disable caching" },
1118                 POPT_COMMON_SAMBA
1119                 POPT_TABLEEND
1120         };
1121         poptContext pc;
1122         int opt;
1123         TALLOC_CTX *frame = talloc_stackframe();
1124
1125         /* glibc (?) likes to print "User defined signal 1" and exit if a
1126            SIGUSR[12] is received before a handler is installed */
1127
1128         CatchSignal(SIGUSR1, SIG_IGN);
1129         CatchSignal(SIGUSR2, SIG_IGN);
1130
1131         fault_setup((void (*)(void *))fault_quit );
1132         dump_core_setup("winbindd");
1133
1134         load_case_tables();
1135
1136         /* Initialise for running in non-root mode */
1137
1138         sec_init();
1139
1140         set_remote_machine_name("winbindd", False);
1141
1142         /* Set environment variable so we don't recursively call ourselves.
1143            This may also be useful interactively. */
1144
1145         if ( !winbind_off() ) {
1146                 DEBUG(0,("Failed to disable recusive winbindd calls.  Exiting.\n"));
1147                 exit(1);
1148         }
1149
1150         /* Initialise samba/rpc client stuff */
1151
1152         pc = poptGetContext("winbindd", argc, (const char **)argv, long_options, 0);
1153
1154         while ((opt = poptGetNextOpt(pc)) != -1) {
1155                 switch (opt) {
1156                         /* Don't become a daemon */
1157                 case OPT_DAEMON:
1158                         is_daemon = True;
1159                         break;
1160                 case 'i':
1161                         interactive = True;
1162                         log_stdout = True;
1163                         Fork = False;
1164                         break;
1165                 case OPT_FORK:
1166                         Fork = false;
1167                         break;
1168                 case OPT_NO_PROCESS_GROUP:
1169                         no_process_group = true;
1170                         break;
1171                 case OPT_LOG_STDOUT:
1172                         log_stdout = true;
1173                         break;
1174                 case 'n':
1175                         opt_nocache = true;
1176                         break;
1177                 default:
1178                         d_fprintf(stderr, "\nInvalid option %s: %s\n\n",
1179                                   poptBadOption(pc, 0), poptStrerror(opt));
1180                         poptPrintUsage(pc, stderr, 0);
1181                         exit(1);
1182                 }
1183         }
1184
1185         if (is_daemon && interactive) {
1186                 d_fprintf(stderr,"\nERROR: "
1187                           "Option -i|--interactive is not allowed together with -D|--daemon\n\n");
1188                 poptPrintUsage(pc, stderr, 0);
1189                 exit(1);
1190         }
1191
1192         if (log_stdout && Fork) {
1193                 d_fprintf(stderr, "\nERROR: "
1194                           "Can't log to stdout (-S) unless daemon is in foreground +(-F) or interactive (-i)\n\n");
1195                 poptPrintUsage(pc, stderr, 0);
1196                 exit(1);
1197         }
1198
1199         poptFreeContext(pc);
1200
1201         if (!override_logfile) {
1202                 char *lfile = NULL;
1203                 if (asprintf(&lfile,"%s/log.winbindd",
1204                                 get_dyn_LOGFILEBASE()) > 0) {
1205                         lp_set_logfile(lfile);
1206                         SAFE_FREE(lfile);
1207                 }
1208         }
1209         setup_logging("winbindd", log_stdout);
1210         reopen_logs();
1211
1212         DEBUG(0,("winbindd version %s started.\n", samba_version_string()));
1213         DEBUGADD(0,("%s\n", COPYRIGHT_STARTUP_MESSAGE));
1214
1215         if (!lp_load_initial_only(get_dyn_CONFIGFILE())) {
1216                 DEBUG(0, ("error opening config file\n"));
1217                 exit(1);
1218         }
1219
1220         /* Initialise messaging system */
1221
1222         if (winbind_messaging_context() == NULL) {
1223                 exit(1);
1224         }
1225
1226         if (!reload_services_file(NULL)) {
1227                 DEBUG(0, ("error opening config file\n"));
1228                 exit(1);
1229         }
1230
1231         if (!directory_exist(lp_lockdir())) {
1232                 mkdir(lp_lockdir(), 0755);
1233         }
1234
1235         /* Setup names. */
1236
1237         if (!init_names())
1238                 exit(1);
1239
1240         load_interfaces();
1241
1242         if (!secrets_init()) {
1243
1244                 DEBUG(0,("Could not initialize domain trust account secrets. Giving up\n"));
1245                 return False;
1246         }
1247
1248         /* Unblock all signals we are interested in as they may have been
1249            blocked by the parent process. */
1250
1251         BlockSignals(False, SIGINT);
1252         BlockSignals(False, SIGQUIT);
1253         BlockSignals(False, SIGTERM);
1254         BlockSignals(False, SIGUSR1);
1255         BlockSignals(False, SIGUSR2);
1256         BlockSignals(False, SIGHUP);
1257         BlockSignals(False, SIGCHLD);
1258
1259         if (!interactive)
1260                 become_daemon(Fork, no_process_group, log_stdout);
1261
1262         pidfile_create("winbindd");
1263
1264 #if HAVE_SETPGID
1265         /*
1266          * If we're interactive we want to set our own process group for
1267          * signal management.
1268          */
1269         if (interactive && !no_process_group)
1270                 setpgid( (pid_t)0, (pid_t)0);
1271 #endif
1272
1273         TimeInit();
1274
1275         /* Don't use winbindd_reinit_after_fork here as
1276          * we're just starting up and haven't created any
1277          * winbindd-specific resources we must free yet. JRA.
1278          */
1279
1280         if (!NT_STATUS_IS_OK(reinit_after_fork(winbind_messaging_context(),
1281                                                winbind_event_context(),
1282                                                false))) {
1283                 DEBUG(0,("reinit_after_fork() failed\n"));
1284                 exit(1);
1285         }
1286
1287         winbindd_register_handlers();
1288
1289         /* setup listen sockets */
1290
1291         if (!winbindd_setup_listeners()) {
1292                 DEBUG(0,("winbindd_setup_listeners() failed\n"));
1293                 exit(1);
1294         }
1295
1296         TALLOC_FREE(frame);
1297         /* Loop waiting for requests */
1298         while (1) {
1299                 frame = talloc_stackframe();
1300
1301                 if (tevent_loop_once(winbind_event_context()) == -1) {
1302                         DEBUG(1, ("tevent_loop_once() failed: %s\n",
1303                                   strerror(errno)));
1304                         return 1;
1305                 }
1306
1307                 TALLOC_FREE(frame);
1308         }
1309
1310         return 0;
1311 }