source3/winbindd/winbindd.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3
   4    Winbind daemon for ntdom nss module
   5
   6    Copyright (C) by Tim Potter 2000-2002
   7    Copyright (C) Andrew Tridgell 2002
   8    Copyright (C) Jelmer Vernooij 2003
   9    Copyright (C) Volker Lendecke 2004
  10
  11    This program is free software; you can redistribute it and/or modify
  12    it under the terms of the GNU General Public License as published by
  13    the Free Software Foundation; either version 3 of the License, or
  14    (at your option) any later version.
  15
  16    This program is distributed in the hope that it will be useful,
  17    but WITHOUT ANY WARRANTY; without even the implied warranty of
  18    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19    GNU General Public License for more details.
  20
  21    You should have received a copy of the GNU General Public License
  22    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  23 */
  24
  25 #include "includes.h"
  26 #include "winbindd.h"
  27 #include "../../nsswitch/libwbclient/wbc_async.h"
  28 #include "librpc/gen_ndr/messaging.h"
  29
  30 #undef DBGC_CLASS
  31 #define DBGC_CLASS DBGC_WINBIND
  32
  33 static void remove_client(struct winbindd_cli_state *state);
  34
  35 static bool opt_nocache = False;
  36 static bool interactive = False;
  37
  38 extern bool override_logfile;
  39
  40 struct messaging_context *winbind_messaging_context(void)
  41 {
  42         static struct messaging_context *ctx;
  43
  44         if (ctx == NULL) {
  45                 ctx = messaging_init(NULL, procid_self(),
  46                                      winbind_event_context());
  47         }
  48         if (ctx == NULL) {
  49                 DEBUG(0, ("Could not init winbind messaging context.\n"));
  50         }
  51         return ctx;
  52 }
  53
  54 /* Reload configuration */
  55
  56 static bool reload_services_file(const char *lfile)
  57 {
  58         bool ret;
  59
  60         if (lp_loaded()) {
  61                 const char *fname = lp_configfile();
  62
  63                 if (file_exist(fname) && !strcsequal(fname,get_dyn_CONFIGFILE())) {
  64                         set_dyn_CONFIGFILE(fname);
  65                 }
  66         }
  67
  68         /* if this is a child, restore the logfile to the special
  69            name - <domain>, idmap, etc. */
  70         if (lfile && *lfile) {
  71                 lp_set_logfile(lfile);
  72         }
  73
  74         reopen_logs();
  75         ret = lp_load(get_dyn_CONFIGFILE(),False,False,True,True);
  76
  77         reopen_logs();
  78         load_interfaces();
  79
  80         return(ret);
  81 }
  82
  83
  84 /**************************************************************************** **
  85  Handle a fault..
  86  **************************************************************************** */
  87
  88 static void fault_quit(void)
  89 {
  90         dump_core();
  91 }
  92
  93 static void winbindd_status(void)
  94 {
  95         struct winbindd_cli_state *tmp;
  96
  97         DEBUG(0, ("winbindd status:\n"));
  98
  99         /* Print client state information */
 100
 101         DEBUG(0, ("\t%d clients currently active\n", winbindd_num_clients()));
 102
 103         if (DEBUGLEVEL >= 2 && winbindd_num_clients()) {
 104                 DEBUG(2, ("\tclient list:\n"));
 105                 for(tmp = winbindd_client_list(); tmp; tmp = tmp->next) {
 106                         DEBUGADD(2, ("\t\tpid %lu, sock %d\n",
 107                                   (unsigned long)tmp->pid, tmp->sock));
 108                 }
 109         }
 110 }
 111
 112 /* Print winbindd status to log file */
 113
 114 static void print_winbindd_status(void)
 115 {
 116         winbindd_status();
 117 }
 118
 119 /* Flush client cache */
 120
 121 static void flush_caches(void)
 122 {
 123         /* We need to invalidate cached user list entries on a SIGHUP
 124            otherwise cached access denied errors due to restrict anonymous
 125            hang around until the sequence number changes. */
 126
 127         if (!wcache_invalidate_cache()) {
 128                 DEBUG(0, ("invalidating the cache failed; revalidate the cache\n"));
 129                 if (!winbindd_cache_validate_and_initialize()) {
 130                         exit(1);
 131                 }
 132         }
 133 }
 134
 135 static void flush_caches_noinit(void)
 136 {
 137         /*
 138          * We need to invalidate cached user list entries on a SIGHUP
 139          * otherwise cached access denied errors due to restrict anonymous
 140          * hang around until the sequence number changes.
 141          * NB
 142          * Skip uninitialized domains when flush cache.
 143          * If domain is not initialized, it means it is never
 144          * used or never become online. look, wcache_invalidate_cache()
 145          * -> get_cache() -> init_dc_connection(). It causes a lot of traffic
 146          * for unused domains and large traffic for primay domain's DC if there
 147          * are many domains..
 148          */
 149
 150         if (!wcache_invalidate_cache_noinit()) {
 151                 DEBUG(0, ("invalidating the cache failed; revalidate the cache\n"));
 152                 if (!winbindd_cache_validate_and_initialize()) {
 153                         exit(1);
 154                 }
 155         }
 156 }
 157
 158 /* Handle the signal by unlinking socket and exiting */
 159
 160 static void terminate(bool is_parent)
 161 {
 162         if (is_parent) {
 163                 /* When parent goes away we should
 164                  * remove the socket file. Not so
 165                  * when children terminate.
 166                  */
 167                 char *path = NULL;
 168
 169                 if (asprintf(&path, "%s/%s",
 170                         get_winbind_pipe_dir(), WINBINDD_SOCKET_NAME) > 0) {
 171                         unlink(path);
 172                         SAFE_FREE(path);
 173                 }
 174         }
 175
 176         idmap_close();
 177
 178         trustdom_cache_shutdown();
 179
 180         gencache_stabilize();
 181
 182 #if 0
 183         if (interactive) {
 184                 TALLOC_CTX *mem_ctx = talloc_init("end_description");
 185                 char *description = talloc_describe_all(mem_ctx);
 186
 187                 DEBUG(3, ("tallocs left:\n%s\n", description));
 188                 talloc_destroy(mem_ctx);
 189         }
 190 #endif
 191
 192         if (is_parent) {
 193                 serverid_deregister_self();
 194                 pidfile_unlink();
 195         }
 196
 197         exit(0);
 198 }
 199
 200 static void winbindd_sig_term_handler(struct tevent_context *ev,
 201                                       struct tevent_signal *se,
 202                                       int signum,
 203                                       int count,
 204                                       void *siginfo,
 205                                       void *private_data)
 206 {
 207         bool *is_parent = talloc_get_type_abort(private_data, bool);
 208
 209         DEBUG(0,("Got sig[%d] terminate (is_parent=%d)\n",
 210                  signum, (int)*is_parent));
 211         terminate(*is_parent);
 212 }
 213
 214 bool winbindd_setup_sig_term_handler(bool parent)
 215 {
 216         struct tevent_signal *se;
 217         bool *is_parent;
 218
 219         is_parent = talloc(winbind_event_context(), bool);
 220         if (!is_parent) {
 221                 return false;
 222         }
 223
 224         *is_parent = parent;
 225
 226         se = tevent_add_signal(winbind_event_context(),
 227                                is_parent,
 228                                SIGTERM, 0,
 229                                winbindd_sig_term_handler,
 230                                is_parent);
 231         if (!se) {
 232                 DEBUG(0,("failed to setup SIGTERM handler"));
 233                 talloc_free(is_parent);
 234                 return false;
 235         }
 236
 237         se = tevent_add_signal(winbind_event_context(),
 238                                is_parent,
 239                                SIGINT, 0,
 240                                winbindd_sig_term_handler,
 241                                is_parent);
 242         if (!se) {
 243                 DEBUG(0,("failed to setup SIGINT handler"));
 244                 talloc_free(is_parent);
 245                 return false;
 246         }
 247
 248         se = tevent_add_signal(winbind_event_context(),
 249                                is_parent,
 250                                SIGQUIT, 0,
 251                                winbindd_sig_term_handler,
 252                                is_parent);
 253         if (!se) {
 254                 DEBUG(0,("failed to setup SIGINT handler"));
 255                 talloc_free(is_parent);
 256                 return false;
 257         }
 258
 259         return true;
 260 }
 261
 262 static void winbindd_sig_hup_handler(struct tevent_context *ev,
 263                                      struct tevent_signal *se,
 264                                      int signum,
 265                                      int count,
 266                                      void *siginfo,
 267                                      void *private_data)
 268 {
 269         const char *file = (const char *)private_data;
 270
 271         DEBUG(1,("Reloading services after SIGHUP\n"));
 272         flush_caches_noinit();
 273         reload_services_file(file);
 274 }
 275
 276 bool winbindd_setup_sig_hup_handler(const char *lfile)
 277 {
 278         struct tevent_signal *se;
 279         char *file = NULL;
 280
 281         if (lfile) {
 282                 file = talloc_strdup(winbind_event_context(),
 283                                      lfile);
 284                 if (!file) {
 285                         return false;
 286                 }
 287         }
 288
 289         se = tevent_add_signal(winbind_event_context(),
 290                                winbind_event_context(),
 291                                SIGHUP, 0,
 292                                winbindd_sig_hup_handler,
 293                                file);
 294         if (!se) {
 295                 return false;
 296         }
 297
 298         return true;
 299 }
 300
 301 static void winbindd_sig_chld_handler(struct tevent_context *ev,
 302                                       struct tevent_signal *se,
 303                                       int signum,
 304                                       int count,
 305                                       void *siginfo,
 306                                       void *private_data)
 307 {
 308         pid_t pid;
 309
 310         while ((pid = sys_waitpid(-1, NULL, WNOHANG)) > 0) {
 311                 winbind_child_died(pid);
 312         }
 313 }
 314
 315 static bool winbindd_setup_sig_chld_handler(void)
 316 {
 317         struct tevent_signal *se;
 318
 319         se = tevent_add_signal(winbind_event_context(),
 320                                winbind_event_context(),
 321                                SIGCHLD, 0,
 322                                winbindd_sig_chld_handler,
 323                                NULL);
 324         if (!se) {
 325                 return false;
 326         }
 327
 328         return true;
 329 }
 330
 331 static void winbindd_sig_usr2_handler(struct tevent_context *ev,
 332                                       struct tevent_signal *se,
 333                                       int signum,
 334                                       int count,
 335                                       void *siginfo,
 336                                       void *private_data)
 337 {
 338         print_winbindd_status();
 339 }
 340
 341 static bool winbindd_setup_sig_usr2_handler(void)
 342 {
 343         struct tevent_signal *se;
 344
 345         se = tevent_add_signal(winbind_event_context(),
 346                                winbind_event_context(),
 347                                SIGUSR2, 0,
 348                                winbindd_sig_usr2_handler,
 349                                NULL);
 350         if (!se) {
 351                 return false;
 352         }
 353
 354         return true;
 355 }
 356
 357 /* React on 'smbcontrol winbindd reload-config' in the same way as on SIGHUP*/
 358 static void msg_reload_services(struct messaging_context *msg,
 359                                 void *private_data,
 360                                 uint32_t msg_type,
 361                                 struct server_id server_id,
 362                                 DATA_BLOB *data)
 363 {
 364         /* Flush various caches */
 365         flush_caches();
 366         reload_services_file((const char *) private_data);
 367 }
 368
 369 /* React on 'smbcontrol winbindd shutdown' in the same way as on SIGTERM*/
 370 static void msg_shutdown(struct messaging_context *msg,
 371                          void *private_data,
 372                          uint32_t msg_type,
 373                          struct server_id server_id,
 374                          DATA_BLOB *data)
 375 {
 376         /* only the parent waits for this message */
 377         DEBUG(0,("Got shutdown message\n"));
 378         terminate(true);
 379 }
 380
 381
 382 static void winbind_msg_validate_cache(struct messaging_context *msg_ctx,
 383                                        void *private_data,
 384                                        uint32_t msg_type,
 385                                        struct server_id server_id,
 386                                        DATA_BLOB *data)
 387 {
 388         uint8 ret;
 389         pid_t child_pid;
 390
 391         DEBUG(10, ("winbindd_msg_validate_cache: got validate-cache "
 392                    "message.\n"));
 393
 394         /*
 395          * call the validation code from a child:
 396          * so we don't block the main winbindd and the validation
 397          * code can safely use fork/waitpid...
 398          */
 399         child_pid = sys_fork();
 400
 401         if (child_pid == -1) {
 402                 DEBUG(1, ("winbind_msg_validate_cache: Could not fork: %s\n",
 403                           strerror(errno)));
 404                 return;
 405         }
 406
 407         if (child_pid != 0) {
 408                 /* parent */
 409                 DEBUG(5, ("winbind_msg_validate_cache: child created with "
 410                           "pid %d.\n", (int)child_pid));
 411                 return;
 412         }
 413
 414         /* child */
 415
 416         if (!winbindd_reinit_after_fork(NULL)) {
 417                 _exit(0);
 418         }
 419
 420         /* install default SIGCHLD handler: validation code uses fork/waitpid */
 421         CatchSignal(SIGCHLD, SIG_DFL);
 422
 423         ret = (uint8)winbindd_validate_cache_nobackup();
 424         DEBUG(10, ("winbindd_msg_validata_cache: got return value %d\n", ret));
 425         messaging_send_buf(msg_ctx, server_id, MSG_WINBIND_VALIDATE_CACHE, &ret,
 426                            (size_t)1);
 427         _exit(0);
 428 }
 429
 430 static struct winbindd_dispatch_table {
 431         enum winbindd_cmd cmd;
 432         void (*fn)(struct winbindd_cli_state *state);
 433         const char *winbindd_cmd_name;
 434 } dispatch_table[] = {
 435
 436         /* Enumeration functions */
 437
 438         { WINBINDD_LIST_TRUSTDOM, winbindd_list_trusted_domains,
 439           "LIST_TRUSTDOM" },
 440
 441         /* Miscellaneous */
 442
 443         { WINBINDD_INFO, winbindd_info, "INFO" },
 444         { WINBINDD_INTERFACE_VERSION, winbindd_interface_version,
 445           "INTERFACE_VERSION" },
 446         { WINBINDD_DOMAIN_NAME, winbindd_domain_name, "DOMAIN_NAME" },
 447         { WINBINDD_DOMAIN_INFO, winbindd_domain_info, "DOMAIN_INFO" },
 448         { WINBINDD_NETBIOS_NAME, winbindd_netbios_name, "NETBIOS_NAME" },
 449         { WINBINDD_PRIV_PIPE_DIR, winbindd_priv_pipe_dir,
 450           "WINBINDD_PRIV_PIPE_DIR" },
 451
 452         /* Credential cache access */
 453         { WINBINDD_CCACHE_NTLMAUTH, winbindd_ccache_ntlm_auth, "NTLMAUTH" },
 454         { WINBINDD_CCACHE_SAVE, winbindd_ccache_save, "CCACHE_SAVE" },
 455
 456         /* WINS functions */
 457
 458         { WINBINDD_WINS_BYNAME, winbindd_wins_byname, "WINS_BYNAME" },
 459         { WINBINDD_WINS_BYIP, winbindd_wins_byip, "WINS_BYIP" },
 460
 461         /* End of list */
 462
 463         { WINBINDD_NUM_CMDS, NULL, "NONE" }
 464 };
 465
 466 struct winbindd_async_dispatch_table {
 467         enum winbindd_cmd cmd;
 468         const char *cmd_name;
 469         struct tevent_req *(*send_req)(TALLOC_CTX *mem_ctx,
 470                                        struct tevent_context *ev,
 471                                        struct winbindd_cli_state *cli,
 472                                        struct winbindd_request *request);
 473         NTSTATUS (*recv_req)(struct tevent_req *req,
 474                              struct winbindd_response *presp);
 475 };
 476
 477 static struct winbindd_async_dispatch_table async_nonpriv_table[] = {
 478         { WINBINDD_PING, "PING",
 479           wb_ping_send, wb_ping_recv },
 480         { WINBINDD_LOOKUPSID, "LOOKUPSID",
 481           winbindd_lookupsid_send, winbindd_lookupsid_recv },
 482         { WINBINDD_LOOKUPNAME, "LOOKUPNAME",
 483           winbindd_lookupname_send, winbindd_lookupname_recv },
 484         { WINBINDD_SID_TO_UID, "SID_TO_UID",
 485           winbindd_sid_to_uid_send, winbindd_sid_to_uid_recv },
 486         { WINBINDD_SID_TO_GID, "SID_TO_GID",
 487           winbindd_sid_to_gid_send, winbindd_sid_to_gid_recv },
 488         { WINBINDD_UID_TO_SID, "UID_TO_SID",
 489           winbindd_uid_to_sid_send, winbindd_uid_to_sid_recv },
 490         { WINBINDD_GID_TO_SID, "GID_TO_SID",
 491           winbindd_gid_to_sid_send, winbindd_gid_to_sid_recv },
 492         { WINBINDD_GETPWSID, "GETPWSID",
 493           winbindd_getpwsid_send, winbindd_getpwsid_recv },
 494         { WINBINDD_GETPWNAM, "GETPWNAM",
 495           winbindd_getpwnam_send, winbindd_getpwnam_recv },
 496         { WINBINDD_GETPWUID, "GETPWUID",
 497           winbindd_getpwuid_send, winbindd_getpwuid_recv },
 498         { WINBINDD_GETSIDALIASES, "GETSIDALIASES",
 499           winbindd_getsidaliases_send, winbindd_getsidaliases_recv },
 500         { WINBINDD_GETUSERDOMGROUPS, "GETUSERDOMGROUPS",
 501           winbindd_getuserdomgroups_send, winbindd_getuserdomgroups_recv },
 502         { WINBINDD_GETGROUPS, "GETGROUPS",
 503           winbindd_getgroups_send, winbindd_getgroups_recv },
 504         { WINBINDD_SHOW_SEQUENCE, "SHOW_SEQUENCE",
 505           winbindd_show_sequence_send, winbindd_show_sequence_recv },
 506         { WINBINDD_GETGRGID, "GETGRGID",
 507           winbindd_getgrgid_send, winbindd_getgrgid_recv },
 508         { WINBINDD_GETGRNAM, "GETGRNAM",
 509           winbindd_getgrnam_send, winbindd_getgrnam_recv },
 510         { WINBINDD_GETUSERSIDS, "GETUSERSIDS",
 511           winbindd_getusersids_send, winbindd_getusersids_recv },
 512         { WINBINDD_LOOKUPRIDS, "LOOKUPRIDS",
 513           winbindd_lookuprids_send, winbindd_lookuprids_recv },
 514         { WINBINDD_SETPWENT, "SETPWENT",
 515           winbindd_setpwent_send, winbindd_setpwent_recv },
 516         { WINBINDD_GETPWENT, "GETPWENT",
 517           winbindd_getpwent_send, winbindd_getpwent_recv },
 518         { WINBINDD_ENDPWENT, "ENDPWENT",
 519           winbindd_endpwent_send, winbindd_endpwent_recv },
 520         { WINBINDD_DSGETDCNAME, "DSGETDCNAME",
 521           winbindd_dsgetdcname_send, winbindd_dsgetdcname_recv },
 522         { WINBINDD_GETDCNAME, "GETDCNAME",
 523           winbindd_getdcname_send, winbindd_getdcname_recv },
 524         { WINBINDD_SETGRENT, "SETGRENT",
 525           winbindd_setgrent_send, winbindd_setgrent_recv },
 526         { WINBINDD_GETGRENT, "GETGRENT",
 527           winbindd_getgrent_send, winbindd_getgrent_recv },
 528         { WINBINDD_ENDGRENT, "ENDGRENT",
 529           winbindd_endgrent_send, winbindd_endgrent_recv },
 530         { WINBINDD_LIST_USERS, "LIST_USERS",
 531           winbindd_list_users_send, winbindd_list_users_recv },
 532         { WINBINDD_LIST_GROUPS, "LIST_GROUPS",
 533           winbindd_list_groups_send, winbindd_list_groups_recv },
 534         { WINBINDD_CHECK_MACHACC, "CHECK_MACHACC",
 535           winbindd_check_machine_acct_send, winbindd_check_machine_acct_recv },
 536         { WINBINDD_PING_DC, "PING_DC",
 537           winbindd_ping_dc_send, winbindd_ping_dc_recv },
 538         { WINBINDD_PAM_AUTH, "PAM_AUTH",
 539           winbindd_pam_auth_send, winbindd_pam_auth_recv },
 540         { WINBINDD_PAM_LOGOFF, "PAM_LOGOFF",
 541           winbindd_pam_logoff_send, winbindd_pam_logoff_recv },
 542         { WINBINDD_PAM_CHAUTHTOK, "PAM_CHAUTHTOK",
 543           winbindd_pam_chauthtok_send, winbindd_pam_chauthtok_recv },
 544         { WINBINDD_PAM_CHNG_PSWD_AUTH_CRAP, "PAM_CHNG_PSWD_AUTH_CRAP",
 545           winbindd_pam_chng_pswd_auth_crap_send,
 546           winbindd_pam_chng_pswd_auth_crap_recv },
 547
 548         { 0, NULL, NULL, NULL }
 549 };
 550
 551 static struct winbindd_async_dispatch_table async_priv_table[] = {
 552         { WINBINDD_ALLOCATE_UID, "ALLOCATE_UID",
 553           winbindd_allocate_uid_send, winbindd_allocate_uid_recv },
 554         { WINBINDD_ALLOCATE_GID, "ALLOCATE_GID",
 555           winbindd_allocate_gid_send, winbindd_allocate_gid_recv },
 556         { WINBINDD_SET_MAPPING, "SET_MAPPING",
 557           winbindd_set_mapping_send, winbindd_set_mapping_recv },
 558         { WINBINDD_REMOVE_MAPPING, "SET_MAPPING",
 559           winbindd_remove_mapping_send, winbindd_remove_mapping_recv },
 560         { WINBINDD_SET_HWM, "SET_HWM",
 561           winbindd_set_hwm_send, winbindd_set_hwm_recv },
 562         { WINBINDD_CHANGE_MACHACC, "CHANGE_MACHACC",
 563           winbindd_change_machine_acct_send, winbindd_change_machine_acct_recv },
 564         { WINBINDD_PAM_AUTH_CRAP, "PAM_AUTH_CRAP",
 565           winbindd_pam_auth_crap_send, winbindd_pam_auth_crap_recv },
 566
 567         { 0, NULL, NULL, NULL }
 568 };
 569
 570 static void wb_request_done(struct tevent_req *req);
 571
 572 static void process_request(struct winbindd_cli_state *state)
 573 {
 574         struct winbindd_dispatch_table *table = dispatch_table;
 575         struct winbindd_async_dispatch_table *atable;
 576
 577         state->mem_ctx = talloc_init("winbind request");
 578         if (state->mem_ctx == NULL)
 579                 return;
 580
 581         /* Remember who asked us. */
 582         state->pid = state->request->pid;
 583
 584         state->cmd_name = "unknown request";
 585         state->recv_fn = NULL;
 586
 587         /* Process command */
 588
 589         for (atable = async_nonpriv_table; atable->send_req; atable += 1) {
 590                 if (state->request->cmd == atable->cmd) {
 591                         break;
 592                 }
 593         }
 594
 595         if ((atable->send_req == NULL) && state->privileged) {
 596                 for (atable = async_priv_table; atable->send_req;
 597                      atable += 1) {
 598                         if (state->request->cmd == atable->cmd) {
 599                                 break;
 600                         }
 601                 }
 602         }
 603
 604         if (atable->send_req != NULL) {
 605                 struct tevent_req *req;
 606
 607                 state->cmd_name = atable->cmd_name;
 608                 state->recv_fn = atable->recv_req;
 609
 610                 DEBUG(10, ("process_request: Handling async request %d:%s\n",
 611                            (int)state->pid, state->cmd_name));
 612
 613                 req = atable->send_req(state->mem_ctx, winbind_event_context(),
 614                                        state, state->request);
 615                 if (req == NULL) {
 616                         DEBUG(0, ("process_request: atable->send failed for "
 617                                   "%s\n", atable->cmd_name));
 618                         request_error(state);
 619                         return;
 620                 }
 621                 tevent_req_set_callback(req, wb_request_done, state);
 622                 return;
 623         }
 624
 625         state->response = talloc_zero(state->mem_ctx,
 626                                       struct winbindd_response);
 627         if (state->response == NULL) {
 628                 DEBUG(10, ("talloc failed\n"));
 629                 remove_client(state);
 630                 return;
 631         }
 632         state->response->result = WINBINDD_PENDING;
 633         state->response->length = sizeof(struct winbindd_response);
 634
 635         for (table = dispatch_table; table->fn; table++) {
 636                 if (state->request->cmd == table->cmd) {
 637                         DEBUG(10,("process_request: request fn %s\n",
 638                                   table->winbindd_cmd_name ));
 639                         state->cmd_name = table->winbindd_cmd_name;
 640                         table->fn(state);
 641                         break;
 642                 }
 643         }
 644
 645         if (!table->fn) {
 646                 DEBUG(10,("process_request: unknown request fn number %d\n",
 647                           (int)state->request->cmd ));
 648                 request_error(state);
 649         }
 650 }
 651
 652 static void wb_request_done(struct tevent_req *req)
 653 {
 654         struct winbindd_cli_state *state = tevent_req_callback_data(
 655                 req, struct winbindd_cli_state);
 656         NTSTATUS status;
 657
 658         state->response = talloc_zero(state->mem_ctx,
 659                                       struct winbindd_response);
 660         if (state->response == NULL) {
 661                 DEBUG(0, ("wb_request_done[%d:%s]: talloc_zero failed - removing client\n",
 662                           (int)state->pid, state->cmd_name));
 663                 remove_client(state);
 664                 return;
 665         }
 666         state->response->result = WINBINDD_PENDING;
 667         state->response->length = sizeof(struct winbindd_response);
 668
 669         status = state->recv_fn(req, state->response);
 670         TALLOC_FREE(req);
 671
 672         DEBUG(10,("wb_request_done[%d:%s]: %s\n",
 673                   (int)state->pid, state->cmd_name, nt_errstr(status)));
 674
 675         if (!NT_STATUS_IS_OK(status)) {
 676                 request_error(state);
 677                 return;
 678         }
 679         request_ok(state);
 680 }
 681
 682 /*
 683  * This is the main event loop of winbind requests. It goes through a
 684  * state-machine of 3 read/write requests, 4 if you have extra data to send.
 685  *
 686  * An idle winbind client has a read request of 4 bytes outstanding,
 687  * finalizing function is request_len_recv, checking the length. request_recv
 688  * then processes the packet. The processing function then at some point has
 689  * to call request_finished which schedules sending the response.
 690  */
 691
 692 static void request_finished(struct winbindd_cli_state *state);
 693
 694 static void winbind_client_request_read(struct tevent_req *req);
 695 static void winbind_client_response_written(struct tevent_req *req);
 696
 697 static void request_finished(struct winbindd_cli_state *state)
 698 {
 699         struct tevent_req *req;
 700
 701         TALLOC_FREE(state->request);
 702
 703         req = wb_resp_write_send(state, winbind_event_context(),
 704                                  state->out_queue, state->sock,
 705                                  state->response);
 706         if (req == NULL) {
 707                 DEBUG(10,("request_finished[%d:%s]: wb_resp_write_send() failed\n",
 708                           (int)state->pid, state->cmd_name));
 709                 remove_client(state);
 710                 return;
 711         }
 712         tevent_req_set_callback(req, winbind_client_response_written, state);
 713 }
 714
 715 static void winbind_client_response_written(struct tevent_req *req)
 716 {
 717         struct winbindd_cli_state *state = tevent_req_callback_data(
 718                 req, struct winbindd_cli_state);
 719         ssize_t ret;
 720         int err;
 721
 722         ret = wb_resp_write_recv(req, &err);
 723         TALLOC_FREE(req);
 724         if (ret == -1) {
 725                 close(state->sock);
 726                 state->sock = -1;
 727                 DEBUG(2, ("Could not write response[%d:%s] to client: %s\n",
 728                           (int)state->pid, state->cmd_name, strerror(err)));
 729                 remove_client(state);
 730                 return;
 731         }
 732
 733         DEBUG(10,("winbind_client_response_written[%d:%s]: delivered response "
 734                   "to client\n", (int)state->pid, state->cmd_name));
 735
 736         TALLOC_FREE(state->mem_ctx);
 737         state->response = NULL;
 738         state->cmd_name = "no request";
 739         state->recv_fn = NULL;
 740
 741         req = wb_req_read_send(state, winbind_event_context(), state->sock,
 742                                WINBINDD_MAX_EXTRA_DATA);
 743         if (req == NULL) {
 744                 remove_client(state);
 745                 return;
 746         }
 747         tevent_req_set_callback(req, winbind_client_request_read, state);
 748 }
 749
 750 void request_error(struct winbindd_cli_state *state)
 751 {
 752         SMB_ASSERT(state->response->result == WINBINDD_PENDING);
 753         state->response->result = WINBINDD_ERROR;
 754         request_finished(state);
 755 }
 756
 757 void request_ok(struct winbindd_cli_state *state)
 758 {
 759         SMB_ASSERT(state->response->result == WINBINDD_PENDING);
 760         state->response->result = WINBINDD_OK;
 761         request_finished(state);
 762 }
 763
 764 /* Process a new connection by adding it to the client connection list */
 765
 766 static void new_connection(int listen_sock, bool privileged)
 767 {
 768         struct sockaddr_un sunaddr;
 769         struct winbindd_cli_state *state;
 770         struct tevent_req *req;
 771         socklen_t len;
 772         int sock;
 773
 774         /* Accept connection */
 775
 776         len = sizeof(sunaddr);
 777
 778         do {
 779                 sock = accept(listen_sock, (struct sockaddr *)(void *)&sunaddr,
 780                               &len);
 781         } while (sock == -1 && errno == EINTR);
 782
 783         if (sock == -1)
 784                 return;
 785
 786         DEBUG(6,("accepted socket %d\n", sock));
 787
 788         /* Create new connection structure */
 789
 790         if ((state = TALLOC_ZERO_P(NULL, struct winbindd_cli_state)) == NULL) {
 791                 close(sock);
 792                 return;
 793         }
 794
 795         state->sock = sock;
 796
 797         state->out_queue = tevent_queue_create(state, "winbind client reply");
 798         if (state->out_queue == NULL) {
 799                 close(sock);
 800                 TALLOC_FREE(state);
 801                 return;
 802         }
 803
 804         state->last_access = time(NULL);
 805
 806         state->privileged = privileged;
 807
 808         req = wb_req_read_send(state, winbind_event_context(), state->sock,
 809                                WINBINDD_MAX_EXTRA_DATA);
 810         if (req == NULL) {
 811                 TALLOC_FREE(state);
 812                 close(sock);
 813                 return;
 814         }
 815         tevent_req_set_callback(req, winbind_client_request_read, state);
 816
 817         /* Add to connection list */
 818
 819         winbindd_add_client(state);
 820 }
 821
 822 static void winbind_client_request_read(struct tevent_req *req)
 823 {
 824         struct winbindd_cli_state *state = tevent_req_callback_data(
 825                 req, struct winbindd_cli_state);
 826         ssize_t ret;
 827         int err;
 828
 829         ret = wb_req_read_recv(req, state, &state->request, &err);
 830         TALLOC_FREE(req);
 831         if (ret == -1) {
 832                 if (err == EPIPE) {
 833                         DEBUG(6, ("closing socket %d, client exited\n",
 834                                   state->sock));
 835                 } else {
 836                         DEBUG(2, ("Could not read client request from fd %d: "
 837                                   "%s\n", state->sock, strerror(err)));
 838                 }
 839                 close(state->sock);
 840                 state->sock = -1;
 841                 remove_client(state);
 842                 return;
 843         }
 844         process_request(state);
 845 }
 846
 847 /* Remove a client connection from client connection list */
 848
 849 static void remove_client(struct winbindd_cli_state *state)
 850 {
 851         char c = 0;
 852         int nwritten;
 853
 854         /* It's a dead client - hold a funeral */
 855
 856         if (state == NULL) {
 857                 return;
 858         }
 859
 860         if (state->sock != -1) {
 861                 /* tell client, we are closing ... */
 862                 nwritten = write(state->sock, &c, sizeof(c));
 863                 if (nwritten == -1) {
 864                         DEBUG(2, ("final write to client failed: %s\n",
 865                                 strerror(errno)));
 866                 }
 867
 868                 /* Close socket */
 869
 870                 close(state->sock);
 871                 state->sock = -1;
 872         }
 873
 874         TALLOC_FREE(state->mem_ctx);
 875
 876         /* Remove from list and free */
 877
 878         winbindd_remove_client(state);
 879         TALLOC_FREE(state);
 880 }
 881
 882 /* Shutdown client connection which has been idle for the longest time */
 883
 884 static bool remove_idle_client(void)
 885 {
 886         struct winbindd_cli_state *state, *remove_state = NULL;
 887         time_t last_access = 0;
 888         int nidle = 0;
 889
 890         for (state = winbindd_client_list(); state; state = state->next) {
 891                 if (state->response == NULL &&
 892                     !state->pwent_state && !state->grent_state) {
 893                         nidle++;
 894                         if (!last_access || state->last_access < last_access) {
 895                                 last_access = state->last_access;
 896                                 remove_state = state;
 897                         }
 898                 }
 899         }
 900
 901         if (remove_state) {
 902                 DEBUG(5,("Found %d idle client connections, shutting down sock %d, pid %u\n",
 903                         nidle, remove_state->sock, (unsigned int)remove_state->pid));
 904                 remove_client(remove_state);
 905                 return True;
 906         }
 907
 908         return False;
 909 }
 910
 911 struct winbindd_listen_state {
 912         bool privileged;
 913         int fd;
 914 };
 915
 916 static void winbindd_listen_fde_handler(struct tevent_context *ev,
 917                                         struct tevent_fd *fde,
 918                                         uint16_t flags,
 919                                         void *private_data)
 920 {
 921         struct winbindd_listen_state *s = talloc_get_type_abort(private_data,
 922                                           struct winbindd_listen_state);
 923
 924         while (winbindd_num_clients() >
 925                WINBINDD_MAX_SIMULTANEOUS_CLIENTS - 1) {
 926                 DEBUG(5,("winbindd: Exceeding %d client "
 927                          "connections, removing idle "
 928                          "connection.\n",
 929                          WINBINDD_MAX_SIMULTANEOUS_CLIENTS));
 930                 if (!remove_idle_client()) {
 931                         DEBUG(0,("winbindd: Exceeding %d "
 932                                  "client connections, no idle "
 933                                  "connection found\n",
 934                                  WINBINDD_MAX_SIMULTANEOUS_CLIENTS));
 935                         break;
 936                 }
 937         }
 938         new_connection(s->fd, s->privileged);
 939 }
 940
 941 /*
 942  * Winbindd socket accessor functions
 943  */
 944
 945 const char *get_winbind_pipe_dir(void)
 946 {
 947         return lp_parm_const_string(-1, "winbindd", "socket dir", WINBINDD_SOCKET_DIR);
 948 }
 949
 950 char *get_winbind_priv_pipe_dir(void)
 951 {
 952         return lock_path(WINBINDD_PRIV_SOCKET_SUBDIR);
 953 }
 954
 955 static bool winbindd_setup_listeners(void)
 956 {
 957         struct winbindd_listen_state *pub_state = NULL;
 958         struct winbindd_listen_state *priv_state = NULL;
 959         struct tevent_fd *fde;
 960
 961         pub_state = talloc(winbind_event_context(),
 962                            struct winbindd_listen_state);
 963         if (!pub_state) {
 964                 goto failed;
 965         }
 966
 967         pub_state->privileged = false;
 968         pub_state->fd = create_pipe_sock(
 969                 get_winbind_pipe_dir(), WINBINDD_SOCKET_NAME, 0755);
 970         if (pub_state->fd == -1) {
 971                 goto failed;
 972         }
 973
 974         fde = tevent_add_fd(winbind_event_context(), pub_state, pub_state->fd,
 975                             TEVENT_FD_READ, winbindd_listen_fde_handler,
 976                             pub_state);
 977         if (fde == NULL) {
 978                 close(pub_state->fd);
 979                 goto failed;
 980         }
 981         tevent_fd_set_auto_close(fde);
 982
 983         priv_state = talloc(winbind_event_context(),
 984                             struct winbindd_listen_state);
 985         if (!priv_state) {
 986                 goto failed;
 987         }
 988
 989         priv_state->privileged = true;
 990         priv_state->fd = create_pipe_sock(
 991                 get_winbind_priv_pipe_dir(), WINBINDD_SOCKET_NAME, 0750);
 992         if (priv_state->fd == -1) {
 993                 goto failed;
 994         }
 995
 996         fde = tevent_add_fd(winbind_event_context(), priv_state,
 997                             priv_state->fd, TEVENT_FD_READ,
 998                             winbindd_listen_fde_handler, priv_state);
 999         if (fde == NULL) {
1000                 close(priv_state->fd);
1001                 goto failed;
1002         }
1003         tevent_fd_set_auto_close(fde);
1004
1005         return true;
1006 failed:
1007         TALLOC_FREE(pub_state);
1008         TALLOC_FREE(priv_state);
1009         return false;
1010 }
1011
1012 bool winbindd_use_idmap_cache(void)
1013 {
1014         return !opt_nocache;
1015 }
1016
1017 bool winbindd_use_cache(void)
1018 {
1019         return !opt_nocache;
1020 }
1021
1022 void winbindd_register_handlers(void)
1023 {
1024         struct tevent_timer *te;
1025         /* Don't use winbindd_reinit_after_fork here as
1026          * we're just starting up and haven't created any
1027          * winbindd-specific resources we must free yet. JRA.
1028          */
1029
1030         if (!NT_STATUS_IS_OK(reinit_after_fork(winbind_messaging_context(),
1031                                                winbind_event_context(),
1032                                                false))) {
1033                 DEBUG(0,("reinit_after_fork() failed\n"));
1034                 exit(1);
1035         }
1036
1037         /* Setup signal handlers */
1038
1039         if (!winbindd_setup_sig_term_handler(true))
1040                 exit(1);
1041         if (!winbindd_setup_sig_hup_handler(NULL))
1042                 exit(1);
1043         if (!winbindd_setup_sig_chld_handler())
1044                 exit(1);
1045         if (!winbindd_setup_sig_usr2_handler())
1046                 exit(1);
1047
1048         CatchSignal(SIGPIPE, SIG_IGN);                 /* Ignore sigpipe */
1049
1050         /*
1051          * Ensure all cache and idmap caches are consistent
1052          * and initialized before we startup.
1053          */
1054         if (!winbindd_cache_validate_and_initialize()) {
1055                 exit(1);
1056         }
1057
1058         /* get broadcast messages */
1059
1060         if (!serverid_register_self(FLAG_MSG_GENERAL|FLAG_MSG_DBWRAP)) {
1061                 DEBUG(1, ("Could not register myself in serverid.tdb\n"));
1062                 exit(1);
1063         }
1064
1065         /* React on 'smbcontrol winbindd reload-config' in the same way
1066            as to SIGHUP signal */
1067         messaging_register(winbind_messaging_context(), NULL,
1068                            MSG_SMB_CONF_UPDATED, msg_reload_services);
1069         messaging_register(winbind_messaging_context(), NULL,
1070                            MSG_SHUTDOWN, msg_shutdown);
1071
1072         /* Handle online/offline messages. */
1073         messaging_register(winbind_messaging_context(), NULL,
1074                            MSG_WINBIND_OFFLINE, winbind_msg_offline);
1075         messaging_register(winbind_messaging_context(), NULL,
1076                            MSG_WINBIND_ONLINE, winbind_msg_online);
1077         messaging_register(winbind_messaging_context(), NULL,
1078                            MSG_WINBIND_ONLINESTATUS, winbind_msg_onlinestatus);
1079
1080         messaging_register(winbind_messaging_context(), NULL,
1081                            MSG_DUMP_EVENT_LIST, winbind_msg_dump_event_list);
1082
1083         messaging_register(winbind_messaging_context(), NULL,
1084                            MSG_WINBIND_VALIDATE_CACHE,
1085                            winbind_msg_validate_cache);
1086
1087         messaging_register(winbind_messaging_context(), NULL,
1088                            MSG_WINBIND_DUMP_DOMAIN_LIST,
1089                            winbind_msg_dump_domain_list);
1090
1091         /* Register handler for MSG_DEBUG. */
1092         messaging_register(winbind_messaging_context(), NULL,
1093                            MSG_DEBUG,
1094                            winbind_msg_debug);
1095
1096         netsamlogon_cache_init(); /* Non-critical */
1097
1098         /* clear the cached list of trusted domains */
1099
1100         wcache_tdc_clear();
1101
1102         if (!init_domain_list()) {
1103                 DEBUG(0,("unable to initialize domain list\n"));
1104                 exit(1);
1105         }
1106
1107         init_idmap_child();
1108         init_locator_child();
1109
1110         smb_nscd_flush_user_cache();
1111         smb_nscd_flush_group_cache();
1112
1113         te = tevent_add_timer(winbind_event_context(), NULL, timeval_zero(),
1114                               rescan_trusted_domains, NULL);
1115         if (te == NULL) {
1116                 DEBUG(0, ("Could not trigger rescan_trusted_domains()\n"));
1117                 exit(1);
1118         }
1119
1120 }
1121
1122 /* Main function */
1123
1124 int main(int argc, char **argv, char **envp)
1125 {
1126         static bool is_daemon = False;
1127         static bool Fork = True;
1128         static bool log_stdout = False;
1129         static bool no_process_group = False;
1130         enum {
1131                 OPT_DAEMON = 1000,
1132                 OPT_FORK,
1133                 OPT_NO_PROCESS_GROUP,
1134                 OPT_LOG_STDOUT
1135         };
1136         struct poptOption long_options[] = {
1137                 POPT_AUTOHELP
1138                 { "stdout", 'S', POPT_ARG_NONE, NULL, OPT_LOG_STDOUT, "Log to stdout" },
1139                 { "foreground", 'F', POPT_ARG_NONE, NULL, OPT_FORK, "Daemon in foreground mode" },
1140                 { "no-process-group", 0, POPT_ARG_NONE, NULL, OPT_NO_PROCESS_GROUP, "Don't create a new process group" },
1141                 { "daemon", 'D', POPT_ARG_NONE, NULL, OPT_DAEMON, "Become a daemon (default)" },
1142                 { "interactive", 'i', POPT_ARG_NONE, NULL, 'i', "Interactive mode" },
1143                 { "no-caching", 'n', POPT_ARG_NONE, NULL, 'n', "Disable caching" },
1144                 POPT_COMMON_SAMBA
1145                 POPT_TABLEEND
1146         };
1147         poptContext pc;
1148         int opt;
1149         TALLOC_CTX *frame = talloc_stackframe();
1150
1151         /* glibc (?) likes to print "User defined signal 1" and exit if a
1152            SIGUSR[12] is received before a handler is installed */
1153
1154         CatchSignal(SIGUSR1, SIG_IGN);
1155         CatchSignal(SIGUSR2, SIG_IGN);
1156
1157         fault_setup((void (*)(void *))fault_quit );
1158         dump_core_setup("winbindd");
1159
1160         load_case_tables();
1161
1162         /* Initialise for running in non-root mode */
1163
1164         sec_init();
1165
1166         set_remote_machine_name("winbindd", False);
1167
1168         /* Set environment variable so we don't recursively call ourselves.
1169            This may also be useful interactively. */
1170
1171         if ( !winbind_off() ) {
1172                 DEBUG(0,("Failed to disable recusive winbindd calls.  Exiting.\n"));
1173                 exit(1);
1174         }
1175
1176         /* Initialise samba/rpc client stuff */
1177
1178         pc = poptGetContext("winbindd", argc, (const char **)argv, long_options, 0);
1179
1180         while ((opt = poptGetNextOpt(pc)) != -1) {
1181                 switch (opt) {
1182                         /* Don't become a daemon */
1183                 case OPT_DAEMON:
1184                         is_daemon = True;
1185                         break;
1186                 case 'i':
1187                         interactive = True;
1188                         log_stdout = True;
1189                         Fork = False;
1190                         break;
1191                 case OPT_FORK:
1192                         Fork = false;
1193                         break;
1194                 case OPT_NO_PROCESS_GROUP:
1195                         no_process_group = true;
1196                         break;
1197                 case OPT_LOG_STDOUT:
1198                         log_stdout = true;
1199                         break;
1200                 case 'n':
1201                         opt_nocache = true;
1202                         break;
1203                 default:
1204                         d_fprintf(stderr, "\nInvalid option %s: %s\n\n",
1205                                   poptBadOption(pc, 0), poptStrerror(opt));
1206                         poptPrintUsage(pc, stderr, 0);
1207                         exit(1);
1208                 }
1209         }
1210
1211         if (is_daemon && interactive) {
1212                 d_fprintf(stderr,"\nERROR: "
1213                           "Option -i|--interactive is not allowed together with -D|--daemon\n\n");
1214                 poptPrintUsage(pc, stderr, 0);
1215                 exit(1);
1216         }
1217
1218         if (log_stdout && Fork) {
1219                 d_fprintf(stderr, "\nERROR: "
1220                           "Can't log to stdout (-S) unless daemon is in foreground +(-F) or interactive (-i)\n\n");
1221                 poptPrintUsage(pc, stderr, 0);
1222                 exit(1);
1223         }
1224
1225         poptFreeContext(pc);
1226
1227         if (!override_logfile) {
1228                 char *lfile = NULL;
1229                 if (asprintf(&lfile,"%s/log.winbindd",
1230                                 get_dyn_LOGFILEBASE()) > 0) {
1231                         lp_set_logfile(lfile);
1232                         SAFE_FREE(lfile);
1233                 }
1234         }
1235         setup_logging("winbindd", log_stdout);
1236         reopen_logs();
1237
1238         DEBUG(0,("winbindd version %s started.\n", samba_version_string()));
1239         DEBUGADD(0,("%s\n", COPYRIGHT_STARTUP_MESSAGE));
1240
1241         if (!lp_load_initial_only(get_dyn_CONFIGFILE())) {
1242                 DEBUG(0, ("error opening config file\n"));
1243                 exit(1);
1244         }
1245
1246         /* Initialise messaging system */
1247
1248         if (winbind_messaging_context() == NULL) {
1249                 exit(1);
1250         }
1251
1252         if (!reload_services_file(NULL)) {
1253                 DEBUG(0, ("error opening config file\n"));
1254                 exit(1);
1255         }
1256
1257         if (!directory_exist(lp_lockdir())) {
1258                 mkdir(lp_lockdir(), 0755);
1259         }
1260
1261         /* Setup names. */
1262
1263         if (!init_names())
1264                 exit(1);
1265
1266         load_interfaces();
1267
1268         if (!secrets_init()) {
1269
1270                 DEBUG(0,("Could not initialize domain trust account secrets. Giving up\n"));
1271                 return False;
1272         }
1273
1274         /* Unblock all signals we are interested in as they may have been
1275            blocked by the parent process. */
1276
1277         BlockSignals(False, SIGINT);
1278         BlockSignals(False, SIGQUIT);
1279         BlockSignals(False, SIGTERM);
1280         BlockSignals(False, SIGUSR1);
1281         BlockSignals(False, SIGUSR2);
1282         BlockSignals(False, SIGHUP);
1283         BlockSignals(False, SIGCHLD);
1284
1285         if (!interactive)
1286                 become_daemon(Fork, no_process_group, log_stdout);
1287
1288         pidfile_create("winbindd");
1289
1290 #if HAVE_SETPGID
1291         /*
1292          * If we're interactive we want to set our own process group for
1293          * signal management.
1294          */
1295         if (interactive && !no_process_group)
1296                 setpgid( (pid_t)0, (pid_t)0);
1297 #endif
1298
1299         TimeInit();
1300
1301         winbindd_register_handlers();
1302
1303         /* setup listen sockets */
1304
1305         if (!winbindd_setup_listeners()) {
1306                 DEBUG(0,("winbindd_setup_listeners() failed\n"));
1307                 exit(1);
1308         }
1309
1310         TALLOC_FREE(frame);
1311         /* Loop waiting for requests */
1312         while (1) {
1313                 frame = talloc_stackframe();
1314
1315                 if (tevent_loop_once(winbind_event_context()) == -1) {
1316                         DEBUG(1, ("tevent_loop_once() failed: %s\n",
1317                                   strerror(errno)));
1318                         return 1;
1319                 }
1320
1321                 TALLOC_FREE(frame);
1322         }
1323
1324         return 0;
1325 }