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