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/winbind_client.h"
  29 #include "../../nsswitch/libwbclient/wbc_async.h"
  30 #include "librpc/gen_ndr/messaging.h"
  31 #include "../librpc/gen_ndr/srv_lsa.h"
  32 #include "../librpc/gen_ndr/srv_samr.h"
  33 #include "secrets.h"
  34
  35 #undef DBGC_CLASS
  36 #define DBGC_CLASS DBGC_WINBIND
  37
  38 static void remove_client(struct winbindd_cli_state *state);
  39
  40 static bool opt_nocache = False;
  41 static bool interactive = False;
  42
  43 extern bool override_logfile;
  44
  45 /* Reload configuration */
  46
  47 static bool reload_services_file(const char *lfile)
  48 {
  49         bool ret;
  50
  51         if (lp_loaded()) {
  52                 const char *fname = lp_configfile();
  53
  54                 if (file_exist(fname) && !strcsequal(fname,get_dyn_CONFIGFILE())) {
  55                         set_dyn_CONFIGFILE(fname);
  56                 }
  57         }
  58
  59         /* if this is a child, restore the logfile to the special
  60            name - <domain>, idmap, etc. */
  61         if (lfile && *lfile) {
  62                 lp_set_logfile(lfile);
  63         }
  64
  65         reopen_logs();
  66         ret = lp_load(get_dyn_CONFIGFILE(),False,False,True,True);
  67
  68         reopen_logs();
  69         load_interfaces();
  70
  71         return(ret);
  72 }
  73
  74
  75 /**************************************************************************** **
  76  Handle a fault..
  77  **************************************************************************** */
  78
  79 static void fault_quit(void)
  80 {
  81         dump_core();
  82 }
  83
  84 static void winbindd_status(void)
  85 {
  86         struct winbindd_cli_state *tmp;
  87
  88         DEBUG(0, ("winbindd status:\n"));
  89
  90         /* Print client state information */
  91
  92         DEBUG(0, ("\t%d clients currently active\n", winbindd_num_clients()));
  93
  94         if (DEBUGLEVEL >= 2 && winbindd_num_clients()) {
  95                 DEBUG(2, ("\tclient list:\n"));
  96                 for(tmp = winbindd_client_list(); tmp; tmp = tmp->next) {
  97                         DEBUGADD(2, ("\t\tpid %lu, sock %d\n",
  98                                   (unsigned long)tmp->pid, tmp->sock));
  99                 }
 100         }
 101 }
 102
 103 /* Print winbindd status to log file */
 104
 105 static void print_winbindd_status(void)
 106 {
 107         winbindd_status();
 108 }
 109
 110 /* Flush client cache */
 111
 112 static void flush_caches(void)
 113 {
 114         /* We need to invalidate cached user list entries on a SIGHUP
 115            otherwise cached access denied errors due to restrict anonymous
 116            hang around until the sequence number changes. */
 117
 118         if (!wcache_invalidate_cache()) {
 119                 DEBUG(0, ("invalidating the cache failed; revalidate the cache\n"));
 120                 if (!winbindd_cache_validate_and_initialize()) {
 121                         exit(1);
 122                 }
 123         }
 124 }
 125
 126 static void flush_caches_noinit(void)
 127 {
 128         /*
 129          * We need to invalidate cached user list entries on a SIGHUP
 130          * otherwise cached access denied errors due to restrict anonymous
 131          * hang around until the sequence number changes.
 132          * NB
 133          * Skip uninitialized domains when flush cache.
 134          * If domain is not initialized, it means it is never
 135          * used or never become online. look, wcache_invalidate_cache()
 136          * -> get_cache() -> init_dc_connection(). It causes a lot of traffic
 137          * for unused domains and large traffic for primay domain's DC if there
 138          * are many domains..
 139          */
 140
 141         if (!wcache_invalidate_cache_noinit()) {
 142                 DEBUG(0, ("invalidating the cache failed; revalidate the cache\n"));
 143                 if (!winbindd_cache_validate_and_initialize()) {
 144                         exit(1);
 145                 }
 146         }
 147 }
 148
 149 /* Handle the signal by unlinking socket and exiting */
 150
 151 static void terminate(bool is_parent)
 152 {
 153         if (is_parent) {
 154                 /* When parent goes away we should
 155                  * remove the socket file. Not so
 156                  * when children terminate.
 157                  */
 158                 char *path = NULL;
 159
 160                 if (asprintf(&path, "%s/%s",
 161                         get_winbind_pipe_dir(), WINBINDD_SOCKET_NAME) > 0) {
 162                         unlink(path);
 163                         SAFE_FREE(path);
 164                 }
 165         }
 166
 167         idmap_close();
 168
 169         trustdom_cache_shutdown();
 170
 171         gencache_stabilize();
 172
 173 #if 0
 174         if (interactive) {
 175                 TALLOC_CTX *mem_ctx = talloc_init("end_description");
 176                 char *description = talloc_describe_all(mem_ctx);
 177
 178                 DEBUG(3, ("tallocs left:\n%s\n", description));
 179                 talloc_destroy(mem_ctx);
 180         }
 181 #endif
 182
 183         if (is_parent) {
 184                 serverid_deregister(procid_self());
 185                 pidfile_unlink();
 186         }
 187
 188         exit(0);
 189 }
 190
 191 static void winbindd_sig_term_handler(struct tevent_context *ev,
 192                                       struct tevent_signal *se,
 193                                       int signum,
 194                                       int count,
 195                                       void *siginfo,
 196                                       void *private_data)
 197 {
 198         bool *is_parent = talloc_get_type_abort(private_data, bool);
 199
 200         DEBUG(0,("Got sig[%d] terminate (is_parent=%d)\n",
 201                  signum, (int)*is_parent));
 202         terminate(*is_parent);
 203 }
 204
 205 bool winbindd_setup_sig_term_handler(bool parent)
 206 {
 207         struct tevent_signal *se;
 208         bool *is_parent;
 209
 210         is_parent = talloc(winbind_event_context(), bool);
 211         if (!is_parent) {
 212                 return false;
 213         }
 214
 215         *is_parent = parent;
 216
 217         se = tevent_add_signal(winbind_event_context(),
 218                                is_parent,
 219                                SIGTERM, 0,
 220                                winbindd_sig_term_handler,
 221                                is_parent);
 222         if (!se) {
 223                 DEBUG(0,("failed to setup SIGTERM handler"));
 224                 talloc_free(is_parent);
 225                 return false;
 226         }
 227
 228         se = tevent_add_signal(winbind_event_context(),
 229                                is_parent,
 230                                SIGINT, 0,
 231                                winbindd_sig_term_handler,
 232                                is_parent);
 233         if (!se) {
 234                 DEBUG(0,("failed to setup SIGINT handler"));
 235                 talloc_free(is_parent);
 236                 return false;
 237         }
 238
 239         se = tevent_add_signal(winbind_event_context(),
 240                                is_parent,
 241                                SIGQUIT, 0,
 242                                winbindd_sig_term_handler,
 243                                is_parent);
 244         if (!se) {
 245                 DEBUG(0,("failed to setup SIGINT handler"));
 246                 talloc_free(is_parent);
 247                 return false;
 248         }
 249
 250         return true;
 251 }
 252
 253 static void winbindd_sig_hup_handler(struct tevent_context *ev,
 254                                      struct tevent_signal *se,
 255                                      int signum,
 256                                      int count,
 257                                      void *siginfo,
 258                                      void *private_data)
 259 {
 260         const char *file = (const char *)private_data;
 261
 262         DEBUG(1,("Reloading services after SIGHUP\n"));
 263         flush_caches_noinit();
 264         reload_services_file(file);
 265 }
 266
 267 bool winbindd_setup_sig_hup_handler(const char *lfile)
 268 {
 269         struct tevent_signal *se;
 270         char *file = NULL;
 271
 272         if (lfile) {
 273                 file = talloc_strdup(winbind_event_context(),
 274                                      lfile);
 275                 if (!file) {
 276                         return false;
 277                 }
 278         }
 279
 280         se = tevent_add_signal(winbind_event_context(),
 281                                winbind_event_context(),
 282                                SIGHUP, 0,
 283                                winbindd_sig_hup_handler,
 284                                file);
 285         if (!se) {
 286                 return false;
 287         }
 288
 289         return true;
 290 }
 291
 292 static void winbindd_sig_chld_handler(struct tevent_context *ev,
 293                                       struct tevent_signal *se,
 294                                       int signum,
 295                                       int count,
 296                                       void *siginfo,
 297                                       void *private_data)
 298 {
 299         pid_t pid;
 300
 301         while ((pid = sys_waitpid(-1, NULL, WNOHANG)) > 0) {
 302                 winbind_child_died(pid);
 303         }
 304 }
 305
 306 static bool winbindd_setup_sig_chld_handler(void)
 307 {
 308         struct tevent_signal *se;
 309
 310         se = tevent_add_signal(winbind_event_context(),
 311                                winbind_event_context(),
 312                                SIGCHLD, 0,
 313                                winbindd_sig_chld_handler,
 314                                NULL);
 315         if (!se) {
 316                 return false;
 317         }
 318
 319         return true;
 320 }
 321
 322 static void winbindd_sig_usr2_handler(struct tevent_context *ev,
 323                                       struct tevent_signal *se,
 324                                       int signum,
 325                                       int count,
 326                                       void *siginfo,
 327                                       void *private_data)
 328 {
 329         print_winbindd_status();
 330 }
 331
 332 static bool winbindd_setup_sig_usr2_handler(void)
 333 {
 334         struct tevent_signal *se;
 335
 336         se = tevent_add_signal(winbind_event_context(),
 337                                winbind_event_context(),
 338                                SIGUSR2, 0,
 339                                winbindd_sig_usr2_handler,
 340                                NULL);
 341         if (!se) {
 342                 return false;
 343         }
 344
 345         return true;
 346 }
 347
 348 /* React on 'smbcontrol winbindd reload-config' in the same way as on SIGHUP*/
 349 static void msg_reload_services(struct messaging_context *msg,
 350                                 void *private_data,
 351                                 uint32_t msg_type,
 352                                 struct server_id server_id,
 353                                 DATA_BLOB *data)
 354 {
 355         /* Flush various caches */
 356         flush_caches();
 357         reload_services_file((const char *) private_data);
 358 }
 359
 360 /* React on 'smbcontrol winbindd shutdown' in the same way as on SIGTERM*/
 361 static void msg_shutdown(struct messaging_context *msg,
 362                          void *private_data,
 363                          uint32_t msg_type,
 364                          struct server_id server_id,
 365                          DATA_BLOB *data)
 366 {
 367         /* only the parent waits for this message */
 368         DEBUG(0,("Got shutdown message\n"));
 369         terminate(true);
 370 }
 371
 372
 373 static void winbind_msg_validate_cache(struct messaging_context *msg_ctx,
 374                                        void *private_data,
 375                                        uint32_t msg_type,
 376                                        struct server_id server_id,
 377                                        DATA_BLOB *data)
 378 {
 379         uint8 ret;
 380         pid_t child_pid;
 381
 382         DEBUG(10, ("winbindd_msg_validate_cache: got validate-cache "
 383                    "message.\n"));
 384
 385         /*
 386          * call the validation code from a child:
 387          * so we don't block the main winbindd and the validation
 388          * code can safely use fork/waitpid...
 389          */
 390         child_pid = sys_fork();
 391
 392         if (child_pid == -1) {
 393                 DEBUG(1, ("winbind_msg_validate_cache: Could not fork: %s\n",
 394                           strerror(errno)));
 395                 return;
 396         }
 397
 398         if (child_pid != 0) {
 399                 /* parent */
 400                 DEBUG(5, ("winbind_msg_validate_cache: child created with "
 401                           "pid %d.\n", (int)child_pid));
 402                 return;
 403         }
 404
 405         /* child */
 406
 407         if (!winbindd_reinit_after_fork(NULL)) {
 408                 _exit(0);
 409         }
 410
 411         /* install default SIGCHLD handler: validation code uses fork/waitpid */
 412         CatchSignal(SIGCHLD, SIG_DFL);
 413
 414         ret = (uint8)winbindd_validate_cache_nobackup();
 415         DEBUG(10, ("winbindd_msg_validata_cache: got return value %d\n", ret));
 416         messaging_send_buf(msg_ctx, server_id, MSG_WINBIND_VALIDATE_CACHE, &ret,
 417                            (size_t)1);
 418         _exit(0);
 419 }
 420
 421 static struct winbindd_dispatch_table {
 422         enum winbindd_cmd cmd;
 423         void (*fn)(struct winbindd_cli_state *state);
 424         const char *winbindd_cmd_name;
 425 } dispatch_table[] = {
 426
 427         /* Enumeration functions */
 428
 429         { WINBINDD_LIST_TRUSTDOM, winbindd_list_trusted_domains,
 430           "LIST_TRUSTDOM" },
 431
 432         /* Miscellaneous */
 433
 434         { WINBINDD_INFO, winbindd_info, "INFO" },
 435         { WINBINDD_INTERFACE_VERSION, winbindd_interface_version,
 436           "INTERFACE_VERSION" },
 437         { WINBINDD_DOMAIN_NAME, winbindd_domain_name, "DOMAIN_NAME" },
 438         { WINBINDD_DOMAIN_INFO, winbindd_domain_info, "DOMAIN_INFO" },
 439         { WINBINDD_NETBIOS_NAME, winbindd_netbios_name, "NETBIOS_NAME" },
 440         { WINBINDD_PRIV_PIPE_DIR, winbindd_priv_pipe_dir,
 441           "WINBINDD_PRIV_PIPE_DIR" },
 442
 443         /* Credential cache access */
 444         { WINBINDD_CCACHE_NTLMAUTH, winbindd_ccache_ntlm_auth, "NTLMAUTH" },
 445         { WINBINDD_CCACHE_SAVE, winbindd_ccache_save, "CCACHE_SAVE" },
 446
 447         /* WINS functions */
 448
 449         { WINBINDD_WINS_BYNAME, winbindd_wins_byname, "WINS_BYNAME" },
 450         { WINBINDD_WINS_BYIP, winbindd_wins_byip, "WINS_BYIP" },
 451
 452         /* End of list */
 453
 454         { WINBINDD_NUM_CMDS, NULL, "NONE" }
 455 };
 456
 457 struct winbindd_async_dispatch_table {
 458         enum winbindd_cmd cmd;
 459         const char *cmd_name;
 460         struct tevent_req *(*send_req)(TALLOC_CTX *mem_ctx,
 461                                        struct tevent_context *ev,
 462                                        struct winbindd_cli_state *cli,
 463                                        struct winbindd_request *request);
 464         NTSTATUS (*recv_req)(struct tevent_req *req,
 465                              struct winbindd_response *presp);
 466 };
 467
 468 static struct winbindd_async_dispatch_table async_nonpriv_table[] = {
 469         { WINBINDD_PING, "PING",
 470           wb_ping_send, wb_ping_recv },
 471         { WINBINDD_LOOKUPSID, "LOOKUPSID",
 472           winbindd_lookupsid_send, winbindd_lookupsid_recv },
 473         { WINBINDD_LOOKUPNAME, "LOOKUPNAME",
 474           winbindd_lookupname_send, winbindd_lookupname_recv },
 475         { WINBINDD_SID_TO_UID, "SID_TO_UID",
 476           winbindd_sid_to_uid_send, winbindd_sid_to_uid_recv },
 477         { WINBINDD_SID_TO_GID, "SID_TO_GID",
 478           winbindd_sid_to_gid_send, winbindd_sid_to_gid_recv },
 479         { WINBINDD_UID_TO_SID, "UID_TO_SID",
 480           winbindd_uid_to_sid_send, winbindd_uid_to_sid_recv },
 481         { WINBINDD_GID_TO_SID, "GID_TO_SID",
 482           winbindd_gid_to_sid_send, winbindd_gid_to_sid_recv },
 483         { WINBINDD_GETPWSID, "GETPWSID",
 484           winbindd_getpwsid_send, winbindd_getpwsid_recv },
 485         { WINBINDD_GETPWNAM, "GETPWNAM",
 486           winbindd_getpwnam_send, winbindd_getpwnam_recv },
 487         { WINBINDD_GETPWUID, "GETPWUID",
 488           winbindd_getpwuid_send, winbindd_getpwuid_recv },
 489         { WINBINDD_GETSIDALIASES, "GETSIDALIASES",
 490           winbindd_getsidaliases_send, winbindd_getsidaliases_recv },
 491         { WINBINDD_GETUSERDOMGROUPS, "GETUSERDOMGROUPS",
 492           winbindd_getuserdomgroups_send, winbindd_getuserdomgroups_recv },
 493         { WINBINDD_GETGROUPS, "GETGROUPS",
 494           winbindd_getgroups_send, winbindd_getgroups_recv },
 495         { WINBINDD_SHOW_SEQUENCE, "SHOW_SEQUENCE",
 496           winbindd_show_sequence_send, winbindd_show_sequence_recv },
 497         { WINBINDD_GETGRGID, "GETGRGID",
 498           winbindd_getgrgid_send, winbindd_getgrgid_recv },
 499         { WINBINDD_GETGRNAM, "GETGRNAM",
 500           winbindd_getgrnam_send, winbindd_getgrnam_recv },
 501         { WINBINDD_GETUSERSIDS, "GETUSERSIDS",
 502           winbindd_getusersids_send, winbindd_getusersids_recv },
 503         { WINBINDD_LOOKUPRIDS, "LOOKUPRIDS",
 504           winbindd_lookuprids_send, winbindd_lookuprids_recv },
 505         { WINBINDD_SETPWENT, "SETPWENT",
 506           winbindd_setpwent_send, winbindd_setpwent_recv },
 507         { WINBINDD_GETPWENT, "GETPWENT",
 508           winbindd_getpwent_send, winbindd_getpwent_recv },
 509         { WINBINDD_ENDPWENT, "ENDPWENT",
 510           winbindd_endpwent_send, winbindd_endpwent_recv },
 511         { WINBINDD_DSGETDCNAME, "DSGETDCNAME",
 512           winbindd_dsgetdcname_send, winbindd_dsgetdcname_recv },
 513         { WINBINDD_GETDCNAME, "GETDCNAME",
 514           winbindd_getdcname_send, winbindd_getdcname_recv },
 515         { WINBINDD_SETGRENT, "SETGRENT",
 516           winbindd_setgrent_send, winbindd_setgrent_recv },
 517         { WINBINDD_GETGRENT, "GETGRENT",
 518           winbindd_getgrent_send, winbindd_getgrent_recv },
 519         { WINBINDD_ENDGRENT, "ENDGRENT",
 520           winbindd_endgrent_send, winbindd_endgrent_recv },
 521         { WINBINDD_LIST_USERS, "LIST_USERS",
 522           winbindd_list_users_send, winbindd_list_users_recv },
 523         { WINBINDD_LIST_GROUPS, "LIST_GROUPS",
 524           winbindd_list_groups_send, winbindd_list_groups_recv },
 525         { WINBINDD_CHECK_MACHACC, "CHECK_MACHACC",
 526           winbindd_check_machine_acct_send, winbindd_check_machine_acct_recv },
 527         { WINBINDD_PING_DC, "PING_DC",
 528           winbindd_ping_dc_send, winbindd_ping_dc_recv },
 529         { WINBINDD_PAM_AUTH, "PAM_AUTH",
 530           winbindd_pam_auth_send, winbindd_pam_auth_recv },
 531         { WINBINDD_PAM_LOGOFF, "PAM_LOGOFF",
 532           winbindd_pam_logoff_send, winbindd_pam_logoff_recv },
 533         { WINBINDD_PAM_CHAUTHTOK, "PAM_CHAUTHTOK",
 534           winbindd_pam_chauthtok_send, winbindd_pam_chauthtok_recv },
 535         { WINBINDD_PAM_CHNG_PSWD_AUTH_CRAP, "PAM_CHNG_PSWD_AUTH_CRAP",
 536           winbindd_pam_chng_pswd_auth_crap_send,
 537           winbindd_pam_chng_pswd_auth_crap_recv },
 538
 539         { 0, NULL, NULL, NULL }
 540 };
 541
 542 static struct winbindd_async_dispatch_table async_priv_table[] = {
 543         { WINBINDD_ALLOCATE_UID, "ALLOCATE_UID",
 544           winbindd_allocate_uid_send, winbindd_allocate_uid_recv },
 545         { WINBINDD_ALLOCATE_GID, "ALLOCATE_GID",
 546           winbindd_allocate_gid_send, winbindd_allocate_gid_recv },
 547         { WINBINDD_CHANGE_MACHACC, "CHANGE_MACHACC",
 548           winbindd_change_machine_acct_send, winbindd_change_machine_acct_recv },
 549         { WINBINDD_PAM_AUTH_CRAP, "PAM_AUTH_CRAP",
 550           winbindd_pam_auth_crap_send, winbindd_pam_auth_crap_recv },
 551
 552         { 0, NULL, NULL, NULL }
 553 };
 554
 555 static void wb_request_done(struct tevent_req *req);
 556
 557 static void process_request(struct winbindd_cli_state *state)
 558 {
 559         struct winbindd_dispatch_table *table = dispatch_table;
 560         struct winbindd_async_dispatch_table *atable;
 561
 562         state->mem_ctx = talloc_named(state, 0, "winbind request");
 563         if (state->mem_ctx == NULL)
 564                 return;
 565
 566         /* Remember who asked us. */
 567         state->pid = state->request->pid;
 568
 569         state->cmd_name = "unknown request";
 570         state->recv_fn = NULL;
 571
 572         /* Process command */
 573
 574         for (atable = async_nonpriv_table; atable->send_req; atable += 1) {
 575                 if (state->request->cmd == atable->cmd) {
 576                         break;
 577                 }
 578         }
 579
 580         if ((atable->send_req == NULL) && state->privileged) {
 581                 for (atable = async_priv_table; atable->send_req;
 582                      atable += 1) {
 583                         if (state->request->cmd == atable->cmd) {
 584                                 break;
 585                         }
 586                 }
 587         }
 588
 589         if (atable->send_req != NULL) {
 590                 struct tevent_req *req;
 591
 592                 state->cmd_name = atable->cmd_name;
 593                 state->recv_fn = atable->recv_req;
 594
 595                 DEBUG(10, ("process_request: Handling async request %d:%s\n",
 596                            (int)state->pid, state->cmd_name));
 597
 598                 req = atable->send_req(state->mem_ctx, winbind_event_context(),
 599                                        state, state->request);
 600                 if (req == NULL) {
 601                         DEBUG(0, ("process_request: atable->send failed for "
 602                                   "%s\n", atable->cmd_name));
 603                         request_error(state);
 604                         return;
 605                 }
 606                 tevent_req_set_callback(req, wb_request_done, state);
 607                 return;
 608         }
 609
 610         state->response = talloc_zero(state->mem_ctx,
 611                                       struct winbindd_response);
 612         if (state->response == NULL) {
 613                 DEBUG(10, ("talloc failed\n"));
 614                 remove_client(state);
 615                 return;
 616         }
 617         state->response->result = WINBINDD_PENDING;
 618         state->response->length = sizeof(struct winbindd_response);
 619
 620         for (table = dispatch_table; table->fn; table++) {
 621                 if (state->request->cmd == table->cmd) {
 622                         DEBUG(10,("process_request: request fn %s\n",
 623                                   table->winbindd_cmd_name ));
 624                         state->cmd_name = table->winbindd_cmd_name;
 625                         table->fn(state);
 626                         break;
 627                 }
 628         }
 629
 630         if (!table->fn) {
 631                 DEBUG(10,("process_request: unknown request fn number %d\n",
 632                           (int)state->request->cmd ));
 633                 request_error(state);
 634         }
 635 }
 636
 637 static void wb_request_done(struct tevent_req *req)
 638 {
 639         struct winbindd_cli_state *state = tevent_req_callback_data(
 640                 req, struct winbindd_cli_state);
 641         NTSTATUS status;
 642
 643         state->response = talloc_zero(state->mem_ctx,
 644                                       struct winbindd_response);
 645         if (state->response == NULL) {
 646                 DEBUG(0, ("wb_request_done[%d:%s]: talloc_zero failed - removing client\n",
 647                           (int)state->pid, state->cmd_name));
 648                 remove_client(state);
 649                 return;
 650         }
 651         state->response->result = WINBINDD_PENDING;
 652         state->response->length = sizeof(struct winbindd_response);
 653
 654         status = state->recv_fn(req, state->response);
 655         TALLOC_FREE(req);
 656
 657         DEBUG(10,("wb_request_done[%d:%s]: %s\n",
 658                   (int)state->pid, state->cmd_name, nt_errstr(status)));
 659
 660         if (!NT_STATUS_IS_OK(status)) {
 661                 request_error(state);
 662                 return;
 663         }
 664         request_ok(state);
 665 }
 666
 667 /*
 668  * This is the main event loop of winbind requests. It goes through a
 669  * state-machine of 3 read/write requests, 4 if you have extra data to send.
 670  *
 671  * An idle winbind client has a read request of 4 bytes outstanding,
 672  * finalizing function is request_len_recv, checking the length. request_recv
 673  * then processes the packet. The processing function then at some point has
 674  * to call request_finished which schedules sending the response.
 675  */
 676
 677 static void request_finished(struct winbindd_cli_state *state);
 678
 679 static void winbind_client_request_read(struct tevent_req *req);
 680 static void winbind_client_response_written(struct tevent_req *req);
 681
 682 static void request_finished(struct winbindd_cli_state *state)
 683 {
 684         struct tevent_req *req;
 685
 686         TALLOC_FREE(state->request);
 687
 688         req = wb_resp_write_send(state, winbind_event_context(),
 689                                  state->out_queue, state->sock,
 690                                  state->response);
 691         if (req == NULL) {
 692                 DEBUG(10,("request_finished[%d:%s]: wb_resp_write_send() failed\n",
 693                           (int)state->pid, state->cmd_name));
 694                 remove_client(state);
 695                 return;
 696         }
 697         tevent_req_set_callback(req, winbind_client_response_written, state);
 698 }
 699
 700 static void winbind_client_response_written(struct tevent_req *req)
 701 {
 702         struct winbindd_cli_state *state = tevent_req_callback_data(
 703                 req, struct winbindd_cli_state);
 704         ssize_t ret;
 705         int err;
 706
 707         ret = wb_resp_write_recv(req, &err);
 708         TALLOC_FREE(req);
 709         if (ret == -1) {
 710                 close(state->sock);
 711                 state->sock = -1;
 712                 DEBUG(2, ("Could not write response[%d:%s] to client: %s\n",
 713                           (int)state->pid, state->cmd_name, strerror(err)));
 714                 remove_client(state);
 715                 return;
 716         }
 717
 718         DEBUG(10,("winbind_client_response_written[%d:%s]: delivered response "
 719                   "to client\n", (int)state->pid, state->cmd_name));
 720
 721         TALLOC_FREE(state->mem_ctx);
 722         state->response = NULL;
 723         state->cmd_name = "no request";
 724         state->recv_fn = NULL;
 725
 726         req = wb_req_read_send(state, winbind_event_context(), state->sock,
 727                                WINBINDD_MAX_EXTRA_DATA);
 728         if (req == NULL) {
 729                 remove_client(state);
 730                 return;
 731         }
 732         tevent_req_set_callback(req, winbind_client_request_read, state);
 733 }
 734
 735 void request_error(struct winbindd_cli_state *state)
 736 {
 737         SMB_ASSERT(state->response->result == WINBINDD_PENDING);
 738         state->response->result = WINBINDD_ERROR;
 739         request_finished(state);
 740 }
 741
 742 void request_ok(struct winbindd_cli_state *state)
 743 {
 744         SMB_ASSERT(state->response->result == WINBINDD_PENDING);
 745         state->response->result = WINBINDD_OK;
 746         request_finished(state);
 747 }
 748
 749 /* Process a new connection by adding it to the client connection list */
 750
 751 static void new_connection(int listen_sock, bool privileged)
 752 {
 753         struct sockaddr_un sunaddr;
 754         struct winbindd_cli_state *state;
 755         struct tevent_req *req;
 756         socklen_t len;
 757         int sock;
 758
 759         /* Accept connection */
 760
 761         len = sizeof(sunaddr);
 762
 763         do {
 764                 sock = accept(listen_sock, (struct sockaddr *)(void *)&sunaddr,
 765                               &len);
 766         } while (sock == -1 && errno == EINTR);
 767
 768         if (sock == -1)
 769                 return;
 770
 771         DEBUG(6,("accepted socket %d\n", sock));
 772
 773         /* Create new connection structure */
 774
 775         if ((state = TALLOC_ZERO_P(NULL, struct winbindd_cli_state)) == NULL) {
 776                 close(sock);
 777                 return;
 778         }
 779
 780         state->sock = sock;
 781
 782         state->out_queue = tevent_queue_create(state, "winbind client reply");
 783         if (state->out_queue == NULL) {
 784                 close(sock);
 785                 TALLOC_FREE(state);
 786                 return;
 787         }
 788
 789         state->last_access = time(NULL);
 790
 791         state->privileged = privileged;
 792
 793         req = wb_req_read_send(state, winbind_event_context(), state->sock,
 794                                WINBINDD_MAX_EXTRA_DATA);
 795         if (req == NULL) {
 796                 TALLOC_FREE(state);
 797                 close(sock);
 798                 return;
 799         }
 800         tevent_req_set_callback(req, winbind_client_request_read, state);
 801
 802         /* Add to connection list */
 803
 804         winbindd_add_client(state);
 805 }
 806
 807 static void winbind_client_request_read(struct tevent_req *req)
 808 {
 809         struct winbindd_cli_state *state = tevent_req_callback_data(
 810                 req, struct winbindd_cli_state);
 811         ssize_t ret;
 812         int err;
 813
 814         ret = wb_req_read_recv(req, state, &state->request, &err);
 815         TALLOC_FREE(req);
 816         if (ret == -1) {
 817                 if (err == EPIPE) {
 818                         DEBUG(6, ("closing socket %d, client exited\n",
 819                                   state->sock));
 820                 } else {
 821                         DEBUG(2, ("Could not read client request from fd %d: "
 822                                   "%s\n", state->sock, strerror(err)));
 823                 }
 824                 close(state->sock);
 825                 state->sock = -1;
 826                 remove_client(state);
 827                 return;
 828         }
 829         process_request(state);
 830 }
 831
 832 /* Remove a client connection from client connection list */
 833
 834 static void remove_client(struct winbindd_cli_state *state)
 835 {
 836         char c = 0;
 837         int nwritten;
 838
 839         /* It's a dead client - hold a funeral */
 840
 841         if (state == NULL) {
 842                 return;
 843         }
 844
 845         if (state->sock != -1) {
 846                 /* tell client, we are closing ... */
 847                 nwritten = write(state->sock, &c, sizeof(c));
 848                 if (nwritten == -1) {
 849                         DEBUG(2, ("final write to client failed: %s\n",
 850                                 strerror(errno)));
 851                 }
 852
 853                 /* Close socket */
 854
 855                 close(state->sock);
 856                 state->sock = -1;
 857         }
 858
 859         TALLOC_FREE(state->mem_ctx);
 860
 861         /* Remove from list and free */
 862
 863         winbindd_remove_client(state);
 864         TALLOC_FREE(state);
 865 }
 866
 867 /* Shutdown client connection which has been idle for the longest time */
 868
 869 static bool remove_idle_client(void)
 870 {
 871         struct winbindd_cli_state *state, *remove_state = NULL;
 872         time_t last_access = 0;
 873         int nidle = 0;
 874
 875         for (state = winbindd_client_list(); state; state = state->next) {
 876                 if (state->response == NULL &&
 877                     !state->pwent_state && !state->grent_state) {
 878                         nidle++;
 879                         if (!last_access || state->last_access < last_access) {
 880                                 last_access = state->last_access;
 881                                 remove_state = state;
 882                         }
 883                 }
 884         }
 885
 886         if (remove_state) {
 887                 DEBUG(5,("Found %d idle client connections, shutting down sock %d, pid %u\n",
 888                         nidle, remove_state->sock, (unsigned int)remove_state->pid));
 889                 remove_client(remove_state);
 890                 return True;
 891         }
 892
 893         return False;
 894 }
 895
 896 struct winbindd_listen_state {
 897         bool privileged;
 898         int fd;
 899 };
 900
 901 static void winbindd_listen_fde_handler(struct tevent_context *ev,
 902                                         struct tevent_fd *fde,
 903                                         uint16_t flags,
 904                                         void *private_data)
 905 {
 906         struct winbindd_listen_state *s = talloc_get_type_abort(private_data,
 907                                           struct winbindd_listen_state);
 908
 909         while (winbindd_num_clients() >
 910                WINBINDD_MAX_SIMULTANEOUS_CLIENTS - 1) {
 911                 DEBUG(5,("winbindd: Exceeding %d client "
 912                          "connections, removing idle "
 913                          "connection.\n",
 914                          WINBINDD_MAX_SIMULTANEOUS_CLIENTS));
 915                 if (!remove_idle_client()) {
 916                         DEBUG(0,("winbindd: Exceeding %d "
 917                                  "client connections, no idle "
 918                                  "connection found\n",
 919                                  WINBINDD_MAX_SIMULTANEOUS_CLIENTS));
 920                         break;
 921                 }
 922         }
 923         new_connection(s->fd, s->privileged);
 924 }
 925
 926 /*
 927  * Winbindd socket accessor functions
 928  */
 929
 930 const char *get_winbind_pipe_dir(void)
 931 {
 932         return lp_parm_const_string(-1, "winbindd", "socket dir", WINBINDD_SOCKET_DIR);
 933 }
 934
 935 char *get_winbind_priv_pipe_dir(void)
 936 {
 937         return lock_path(WINBINDD_PRIV_SOCKET_SUBDIR);
 938 }
 939
 940 static bool winbindd_setup_listeners(void)
 941 {
 942         struct winbindd_listen_state *pub_state = NULL;
 943         struct winbindd_listen_state *priv_state = NULL;
 944         struct tevent_fd *fde;
 945
 946         pub_state = talloc(winbind_event_context(),
 947                            struct winbindd_listen_state);
 948         if (!pub_state) {
 949                 goto failed;
 950         }
 951
 952         pub_state->privileged = false;
 953         pub_state->fd = create_pipe_sock(
 954                 get_winbind_pipe_dir(), WINBINDD_SOCKET_NAME, 0755);
 955         if (pub_state->fd == -1) {
 956                 goto failed;
 957         }
 958
 959         fde = tevent_add_fd(winbind_event_context(), pub_state, pub_state->fd,
 960                             TEVENT_FD_READ, winbindd_listen_fde_handler,
 961                             pub_state);
 962         if (fde == NULL) {
 963                 close(pub_state->fd);
 964                 goto failed;
 965         }
 966         tevent_fd_set_auto_close(fde);
 967
 968         priv_state = talloc(winbind_event_context(),
 969                             struct winbindd_listen_state);
 970         if (!priv_state) {
 971                 goto failed;
 972         }
 973
 974         priv_state->privileged = true;
 975         priv_state->fd = create_pipe_sock(
 976                 get_winbind_priv_pipe_dir(), WINBINDD_SOCKET_NAME, 0750);
 977         if (priv_state->fd == -1) {
 978                 goto failed;
 979         }
 980
 981         fde = tevent_add_fd(winbind_event_context(), priv_state,
 982                             priv_state->fd, TEVENT_FD_READ,
 983                             winbindd_listen_fde_handler, priv_state);
 984         if (fde == NULL) {
 985                 close(priv_state->fd);
 986                 goto failed;
 987         }
 988         tevent_fd_set_auto_close(fde);
 989
 990         return true;
 991 failed:
 992         TALLOC_FREE(pub_state);
 993         TALLOC_FREE(priv_state);
 994         return false;
 995 }
 996
 997 bool winbindd_use_idmap_cache(void)
 998 {
 999         return !opt_nocache;
1000 }
1001
1002 bool winbindd_use_cache(void)
1003 {
1004         return !opt_nocache;
1005 }
1006
1007 void winbindd_register_handlers(void)
1008 {
1009         struct tevent_timer *te;
1010         /* Setup signal handlers */
1011
1012         if (!winbindd_setup_sig_term_handler(true))
1013                 exit(1);
1014         if (!winbindd_setup_sig_hup_handler(NULL))
1015                 exit(1);
1016         if (!winbindd_setup_sig_chld_handler())
1017                 exit(1);
1018         if (!winbindd_setup_sig_usr2_handler())
1019                 exit(1);
1020
1021         CatchSignal(SIGPIPE, SIG_IGN);                 /* Ignore sigpipe */
1022
1023         /*
1024          * Ensure all cache and idmap caches are consistent
1025          * and initialized before we startup.
1026          */
1027         if (!winbindd_cache_validate_and_initialize()) {
1028                 exit(1);
1029         }
1030
1031         /* get broadcast messages */
1032
1033         if (!serverid_register(procid_self(),
1034                                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         NTSTATUS status;
1125
1126         /* glibc (?) likes to print "User defined signal 1" and exit if a
1127            SIGUSR[12] is received before a handler is installed */
1128
1129         CatchSignal(SIGUSR1, SIG_IGN);
1130         CatchSignal(SIGUSR2, SIG_IGN);
1131
1132         fault_setup((void (*)(void *))fault_quit );
1133         dump_core_setup("winbindd");
1134
1135         load_case_tables();
1136
1137         /* Initialise for running in non-root mode */
1138
1139         sec_init();
1140
1141         set_remote_machine_name("winbindd", False);
1142
1143         /* Set environment variable so we don't recursively call ourselves.
1144            This may also be useful interactively. */
1145
1146         if ( !winbind_off() ) {
1147                 DEBUG(0,("Failed to disable recusive winbindd calls.  Exiting.\n"));
1148                 exit(1);
1149         }
1150
1151         /* Initialise samba/rpc client stuff */
1152
1153         pc = poptGetContext("winbindd", argc, (const char **)argv, long_options, 0);
1154
1155         while ((opt = poptGetNextOpt(pc)) != -1) {
1156                 switch (opt) {
1157                         /* Don't become a daemon */
1158                 case OPT_DAEMON:
1159                         is_daemon = True;
1160                         break;
1161                 case 'i':
1162                         interactive = True;
1163                         log_stdout = True;
1164                         Fork = False;
1165                         break;
1166                 case OPT_FORK:
1167                         Fork = false;
1168                         break;
1169                 case OPT_NO_PROCESS_GROUP:
1170                         no_process_group = true;
1171                         break;
1172                 case OPT_LOG_STDOUT:
1173                         log_stdout = true;
1174                         break;
1175                 case 'n':
1176                         opt_nocache = true;
1177                         break;
1178                 default:
1179                         d_fprintf(stderr, "\nInvalid option %s: %s\n\n",
1180                                   poptBadOption(pc, 0), poptStrerror(opt));
1181                         poptPrintUsage(pc, stderr, 0);
1182                         exit(1);
1183                 }
1184         }
1185
1186         if (is_daemon && interactive) {
1187                 d_fprintf(stderr,"\nERROR: "
1188                           "Option -i|--interactive is not allowed together with -D|--daemon\n\n");
1189                 poptPrintUsage(pc, stderr, 0);
1190                 exit(1);
1191         }
1192
1193         if (log_stdout && Fork) {
1194                 d_fprintf(stderr, "\nERROR: "
1195                           "Can't log to stdout (-S) unless daemon is in foreground +(-F) or interactive (-i)\n\n");
1196                 poptPrintUsage(pc, stderr, 0);
1197                 exit(1);
1198         }
1199
1200         poptFreeContext(pc);
1201
1202         if (!override_logfile) {
1203                 char *lfile = NULL;
1204                 if (asprintf(&lfile,"%s/log.winbindd",
1205                                 get_dyn_LOGFILEBASE()) > 0) {
1206                         lp_set_logfile(lfile);
1207                         SAFE_FREE(lfile);
1208                 }
1209         }
1210         setup_logging("winbindd", log_stdout);
1211         reopen_logs();
1212
1213         DEBUG(0,("winbindd version %s started.\n", samba_version_string()));
1214         DEBUGADD(0,("%s\n", COPYRIGHT_STARTUP_MESSAGE));
1215
1216         if (!lp_load_initial_only(get_dyn_CONFIGFILE())) {
1217                 DEBUG(0, ("error opening config file\n"));
1218                 exit(1);
1219         }
1220
1221         /* Initialise messaging system */
1222
1223         if (winbind_messaging_context() == NULL) {
1224                 exit(1);
1225         }
1226
1227         if (!reload_services_file(NULL)) {
1228                 DEBUG(0, ("error opening config file\n"));
1229                 exit(1);
1230         }
1231
1232         if (!directory_exist(lp_lockdir())) {
1233                 mkdir(lp_lockdir(), 0755);
1234         }
1235
1236         /* Setup names. */
1237
1238         if (!init_names())
1239                 exit(1);
1240
1241         load_interfaces();
1242
1243         if (!secrets_init()) {
1244
1245                 DEBUG(0,("Could not initialize domain trust account secrets. Giving up\n"));
1246                 return False;
1247         }
1248
1249         /* Unblock all signals we are interested in as they may have been
1250            blocked by the parent process. */
1251
1252         BlockSignals(False, SIGINT);
1253         BlockSignals(False, SIGQUIT);
1254         BlockSignals(False, SIGTERM);
1255         BlockSignals(False, SIGUSR1);
1256         BlockSignals(False, SIGUSR2);
1257         BlockSignals(False, SIGHUP);
1258         BlockSignals(False, SIGCHLD);
1259
1260         if (!interactive)
1261                 become_daemon(Fork, no_process_group, log_stdout);
1262
1263         pidfile_create("winbindd");
1264
1265 #if HAVE_SETPGID
1266         /*
1267          * If we're interactive we want to set our own process group for
1268          * signal management.
1269          */
1270         if (interactive && !no_process_group)
1271                 setpgid( (pid_t)0, (pid_t)0);
1272 #endif
1273
1274         TimeInit();
1275
1276         /* Don't use winbindd_reinit_after_fork here as
1277          * we're just starting up and haven't created any
1278          * winbindd-specific resources we must free yet. JRA.
1279          */
1280
1281         status = reinit_after_fork(winbind_messaging_context(),
1282                                    winbind_event_context(),
1283                                    procid_self(), false);
1284         if (!NT_STATUS_IS_OK(status)) {
1285                 DEBUG(0,("reinit_after_fork() failed\n"));
1286                 exit(1);
1287         }
1288
1289         winbindd_register_handlers();
1290
1291         rpc_lsarpc_init(NULL);
1292         rpc_samr_init(NULL);
1293
1294         if (!init_system_info()) {
1295                 DEBUG(0,("ERROR: failed to setup system user info.\n"));
1296                 exit(1);
1297         }
1298
1299         /* setup listen sockets */
1300
1301         if (!winbindd_setup_listeners()) {
1302                 DEBUG(0,("winbindd_setup_listeners() failed\n"));
1303                 exit(1);
1304         }
1305
1306         TALLOC_FREE(frame);
1307         /* Loop waiting for requests */
1308         while (1) {
1309                 frame = talloc_stackframe();
1310
1311                 if (tevent_loop_once(winbind_event_context()) == -1) {
1312                         DEBUG(1, ("tevent_loop_once() failed: %s\n",
1313                                   strerror(errno)));
1314                         return 1;
1315                 }
1316
1317                 TALLOC_FREE(frame);
1318         }
1319
1320         return 0;
1321 }