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         CatchChild();
 387         child_pid = sys_fork();
 388
 389         if (child_pid == -1) {
 390                 DEBUG(1, ("winbind_msg_validate_cache: Could not fork: %s\n",
 391                           strerror(errno)));
 392                 return;
 393         }
 394
 395         if (child_pid != 0) {
 396                 /* parent */
 397                 DEBUG(5, ("winbind_msg_validate_cache: child created with "
 398                           "pid %d.\n", (int)child_pid));
 399                 return;
 400         }
 401
 402         /* child */
 403
 404         /* install default SIGCHLD handler: validation code uses fork/waitpid */
 405         ZERO_STRUCT(act);
 406         act.sa_handler = SIG_DFL;
 407 #ifdef SA_RESTART
 408         /* We *want* SIGALRM to interrupt a system call. */
 409         act.sa_flags = SA_RESTART;
 410 #endif
 411         sigemptyset(&act.sa_mask);
 412         sigaddset(&act.sa_mask,SIGCHLD);
 413         sigaction(SIGCHLD,&act,&oldact);
 414
 415         ret = (uint8)winbindd_validate_cache_nobackup();
 416         DEBUG(10, ("winbindd_msg_validata_cache: got return value %d\n", ret));
 417         messaging_send_buf(msg_ctx, server_id, MSG_WINBIND_VALIDATE_CACHE, &ret,
 418                            (size_t)1);
 419         _exit(0);
 420 }
 421
 422 static struct winbindd_dispatch_table {
 423         enum winbindd_cmd cmd;
 424         void (*fn)(struct winbindd_cli_state *state);
 425         const char *winbindd_cmd_name;
 426 } dispatch_table[] = {
 427
 428         /* PAM auth functions */
 429
 430         { WINBINDD_PAM_AUTH, winbindd_pam_auth, "PAM_AUTH" },
 431         { WINBINDD_PAM_AUTH_CRAP, winbindd_pam_auth_crap, "AUTH_CRAP" },
 432         { WINBINDD_PAM_CHAUTHTOK, winbindd_pam_chauthtok, "CHAUTHTOK" },
 433         { WINBINDD_PAM_LOGOFF, winbindd_pam_logoff, "PAM_LOGOFF" },
 434         { WINBINDD_PAM_CHNG_PSWD_AUTH_CRAP, winbindd_pam_chng_pswd_auth_crap, "CHNG_PSWD_AUTH_CRAP" },
 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
 539         { 0, NULL, NULL, NULL }
 540 };
 541
 542 static struct winbindd_async_dispatch_table async_priv_table[] = {
 543         { WINBINDD_ALLOCATE_UID, "ALLOCATE_UID",
 544           winbindd_allocate_uid_send, winbindd_allocate_uid_recv },
 545         { WINBINDD_ALLOCATE_GID, "ALLOCATE_GID",
 546           winbindd_allocate_gid_send, winbindd_allocate_gid_recv },
 547         { WINBINDD_SET_MAPPING, "SET_MAPPING",
 548           winbindd_set_mapping_send, winbindd_set_mapping_recv },
 549         { WINBINDD_REMOVE_MAPPING, "SET_MAPPING",
 550           winbindd_remove_mapping_send, winbindd_remove_mapping_recv },
 551         { WINBINDD_SET_HWM, "SET_HWM",
 552           winbindd_set_hwm_send, winbindd_set_hwm_recv },
 553         { WINBINDD_CHANGE_MACHACC, "CHANGE_MACHACC",
 554           winbindd_change_machine_acct_send, winbindd_change_machine_acct_recv },
 555
 556         { 0, NULL, NULL, NULL }
 557 };
 558
 559 static void wb_request_done(struct tevent_req *req);
 560
 561 static void process_request(struct winbindd_cli_state *state)
 562 {
 563         struct winbindd_dispatch_table *table = dispatch_table;
 564         struct winbindd_async_dispatch_table *atable;
 565
 566         state->mem_ctx = talloc_init("winbind request");
 567         if (state->mem_ctx == NULL)
 568                 return;
 569
 570         /* Remember who asked us. */
 571         state->pid = state->request->pid;
 572
 573         state->cmd_name = "unknown request";
 574         state->recv_fn = NULL;
 575
 576         /* Process command */
 577
 578         for (atable = async_nonpriv_table; atable->send_req; atable += 1) {
 579                 if (state->request->cmd == atable->cmd) {
 580                         break;
 581                 }
 582         }
 583
 584         if ((atable->send_req == NULL) && state->privileged) {
 585                 for (atable = async_priv_table; atable->send_req;
 586                      atable += 1) {
 587                         if (state->request->cmd == atable->cmd) {
 588                                 break;
 589                         }
 590                 }
 591         }
 592
 593         if (atable->send_req != NULL) {
 594                 struct tevent_req *req;
 595
 596                 state->cmd_name = atable->cmd_name;
 597                 state->recv_fn = atable->recv_req;
 598
 599                 DEBUG(10, ("process_request: Handling async request %d:%s\n",
 600                            (int)state->pid, state->cmd_name));
 601
 602                 req = atable->send_req(state->mem_ctx, winbind_event_context(),
 603                                        state, state->request);
 604                 if (req == NULL) {
 605                         DEBUG(0, ("process_request: atable->send failed for "
 606                                   "%s\n", atable->cmd_name));
 607                         request_error(state);
 608                         return;
 609                 }
 610                 tevent_req_set_callback(req, wb_request_done, state);
 611                 return;
 612         }
 613
 614         state->response = talloc_zero(state->mem_ctx,
 615                                       struct winbindd_response);
 616         if (state->response == NULL) {
 617                 DEBUG(10, ("talloc failed\n"));
 618                 remove_client(state);
 619                 return;
 620         }
 621         state->response->result = WINBINDD_PENDING;
 622         state->response->length = sizeof(struct winbindd_response);
 623
 624         for (table = dispatch_table; table->fn; table++) {
 625                 if (state->request->cmd == table->cmd) {
 626                         DEBUG(10,("process_request: request fn %s\n",
 627                                   table->winbindd_cmd_name ));
 628                         state->cmd_name = table->winbindd_cmd_name;
 629                         table->fn(state);
 630                         break;
 631                 }
 632         }
 633
 634         if (!table->fn) {
 635                 DEBUG(10,("process_request: unknown request fn number %d\n",
 636                           (int)state->request->cmd ));
 637                 request_error(state);
 638         }
 639 }
 640
 641 static void wb_request_done(struct tevent_req *req)
 642 {
 643         struct winbindd_cli_state *state = tevent_req_callback_data(
 644                 req, struct winbindd_cli_state);
 645         NTSTATUS status;
 646
 647         state->response = talloc_zero(state, struct winbindd_response);
 648         if (state->response == NULL) {
 649                 DEBUG(0, ("wb_request_done[%d:%s]: talloc_zero failed - removing client\n",
 650                           (int)state->pid, state->cmd_name));
 651                 remove_client(state);
 652                 return;
 653         }
 654         state->response->result = WINBINDD_PENDING;
 655         state->response->length = sizeof(struct winbindd_response);
 656
 657         status = state->recv_fn(req, state->response);
 658         TALLOC_FREE(req);
 659
 660         DEBUG(10,("wb_request_done[%d:%s]: %s\n",
 661                   (int)state->pid, state->cmd_name, nt_errstr(status)));
 662
 663         if (!NT_STATUS_IS_OK(status)) {
 664                 request_error(state);
 665                 return;
 666         }
 667         request_ok(state);
 668 }
 669
 670 /*
 671  * This is the main event loop of winbind requests. It goes through a
 672  * state-machine of 3 read/write requests, 4 if you have extra data to send.
 673  *
 674  * An idle winbind client has a read request of 4 bytes outstanding,
 675  * finalizing function is request_len_recv, checking the length. request_recv
 676  * then processes the packet. The processing function then at some point has
 677  * to call request_finished which schedules sending the response.
 678  */
 679
 680 static void request_finished(struct winbindd_cli_state *state);
 681
 682 static void winbind_client_request_read(struct tevent_req *req);
 683 static void winbind_client_response_written(struct tevent_req *req);
 684
 685 static void request_finished(struct winbindd_cli_state *state)
 686 {
 687         struct tevent_req *req;
 688
 689         TALLOC_FREE(state->request);
 690
 691         req = wb_resp_write_send(state, winbind_event_context(),
 692                                  state->out_queue, state->sock,
 693                                  state->response);
 694         if (req == NULL) {
 695                 DEBUG(10,("request_finished[%d:%s]: wb_resp_write_send() failed\n",
 696                           (int)state->pid, state->cmd_name));
 697                 remove_client(state);
 698                 return;
 699         }
 700         tevent_req_set_callback(req, winbind_client_response_written, state);
 701 }
 702
 703 static void winbind_client_response_written(struct tevent_req *req)
 704 {
 705         struct winbindd_cli_state *state = tevent_req_callback_data(
 706                 req, struct winbindd_cli_state);
 707         ssize_t ret;
 708         int err;
 709
 710         ret = wb_resp_write_recv(req, &err);
 711         TALLOC_FREE(req);
 712         if (ret == -1) {
 713                 close(state->sock);
 714                 state->sock = -1;
 715                 DEBUG(2, ("Could not write response[%d:%s] to client: %s\n",
 716                           (int)state->pid, state->cmd_name, strerror(err)));
 717                 remove_client(state);
 718                 return;
 719         }
 720
 721         DEBUG(10,("winbind_client_response_written[%d:%s]: deliverd response to client\n",
 722                   (int)state->pid, state->cmd_name));
 723
 724         TALLOC_FREE(state->mem_ctx);
 725         state->response = NULL;
 726         state->cmd_name = "no request";
 727         state->recv_fn = NULL;
 728
 729         req = wb_req_read_send(state, winbind_event_context(), state->sock,
 730                                WINBINDD_MAX_EXTRA_DATA);
 731         if (req == NULL) {
 732                 remove_client(state);
 733                 return;
 734         }
 735         tevent_req_set_callback(req, winbind_client_request_read, state);
 736 }
 737
 738 void request_error(struct winbindd_cli_state *state)
 739 {
 740         SMB_ASSERT(state->response->result == WINBINDD_PENDING);
 741         state->response->result = WINBINDD_ERROR;
 742         request_finished(state);
 743 }
 744
 745 void request_ok(struct winbindd_cli_state *state)
 746 {
 747         SMB_ASSERT(state->response->result == WINBINDD_PENDING);
 748         state->response->result = WINBINDD_OK;
 749         request_finished(state);
 750 }
 751
 752 /* Process a new connection by adding it to the client connection list */
 753
 754 static void new_connection(int listen_sock, bool privileged)
 755 {
 756         struct sockaddr_un sunaddr;
 757         struct winbindd_cli_state *state;
 758         struct tevent_req *req;
 759         socklen_t len;
 760         int sock;
 761
 762         /* Accept connection */
 763
 764         len = sizeof(sunaddr);
 765
 766         do {
 767                 sock = accept(listen_sock, (struct sockaddr *)(void *)&sunaddr,
 768                               &len);
 769         } while (sock == -1 && errno == EINTR);
 770
 771         if (sock == -1)
 772                 return;
 773
 774         DEBUG(6,("accepted socket %d\n", sock));
 775
 776         /* Create new connection structure */
 777
 778         if ((state = TALLOC_ZERO_P(NULL, struct winbindd_cli_state)) == NULL) {
 779                 close(sock);
 780                 return;
 781         }
 782
 783         state->sock = sock;
 784
 785         state->out_queue = tevent_queue_create(state, "winbind client reply");
 786         if (state->out_queue == NULL) {
 787                 close(sock);
 788                 TALLOC_FREE(state);
 789                 return;
 790         }
 791
 792         state->last_access = time(NULL);
 793
 794         state->privileged = privileged;
 795
 796         req = wb_req_read_send(state, winbind_event_context(), state->sock,
 797                                WINBINDD_MAX_EXTRA_DATA);
 798         if (req == NULL) {
 799                 TALLOC_FREE(state);
 800                 close(sock);
 801                 return;
 802         }
 803         tevent_req_set_callback(req, winbind_client_request_read, state);
 804
 805         /* Add to connection list */
 806
 807         winbindd_add_client(state);
 808 }
 809
 810 static void winbind_client_request_read(struct tevent_req *req)
 811 {
 812         struct winbindd_cli_state *state = tevent_req_callback_data(
 813                 req, struct winbindd_cli_state);
 814         ssize_t ret;
 815         int err;
 816
 817         ret = wb_req_read_recv(req, state, &state->request, &err);
 818         TALLOC_FREE(req);
 819         if (ret == -1) {
 820                 if (err == EPIPE) {
 821                         DEBUG(6, ("closing socket %d, client exited\n",
 822                                   state->sock));
 823                 } else {
 824                         DEBUG(2, ("Could not read client request from fd %d: "
 825                                   "%s\n", state->sock, strerror(err)));
 826                 }
 827                 close(state->sock);
 828                 state->sock = -1;
 829                 remove_client(state);
 830                 return;
 831         }
 832         process_request(state);
 833 }
 834
 835 /* Remove a client connection from client connection list */
 836
 837 static void remove_client(struct winbindd_cli_state *state)
 838 {
 839         char c = 0;
 840         int nwritten;
 841
 842         /* It's a dead client - hold a funeral */
 843
 844         if (state == NULL) {
 845                 return;
 846         }
 847
 848         if (state->sock != -1) {
 849                 /* tell client, we are closing ... */
 850                 nwritten = write(state->sock, &c, sizeof(c));
 851                 if (nwritten == -1) {
 852                         DEBUG(2, ("final write to client failed: %s\n",
 853                                 strerror(errno)));
 854                 }
 855
 856                 /* Close socket */
 857
 858                 close(state->sock);
 859                 state->sock = -1;
 860         }
 861
 862         TALLOC_FREE(state->mem_ctx);
 863
 864         /* Remove from list and free */
 865
 866         winbindd_remove_client(state);
 867         TALLOC_FREE(state);
 868 }
 869
 870 /* Shutdown client connection which has been idle for the longest time */
 871
 872 static bool remove_idle_client(void)
 873 {
 874         struct winbindd_cli_state *state, *remove_state = NULL;
 875         time_t last_access = 0;
 876         int nidle = 0;
 877
 878         for (state = winbindd_client_list(); state; state = state->next) {
 879                 if (state->response == NULL &&
 880                     !state->pwent_state && !state->grent_state) {
 881                         nidle++;
 882                         if (!last_access || state->last_access < last_access) {
 883                                 last_access = state->last_access;
 884                                 remove_state = state;
 885                         }
 886                 }
 887         }
 888
 889         if (remove_state) {
 890                 DEBUG(5,("Found %d idle client connections, shutting down sock %d, pid %u\n",
 891                         nidle, remove_state->sock, (unsigned int)remove_state->pid));
 892                 remove_client(remove_state);
 893                 return True;
 894         }
 895
 896         return False;
 897 }
 898
 899 struct winbindd_listen_state {
 900         bool privileged;
 901         int fd;
 902 };
 903
 904 static void winbindd_listen_fde_handler(struct tevent_context *ev,
 905                                         struct tevent_fd *fde,
 906                                         uint16_t flags,
 907                                         void *private_data)
 908 {
 909         struct winbindd_listen_state *s = talloc_get_type_abort(private_data,
 910                                           struct winbindd_listen_state);
 911
 912         while (winbindd_num_clients() >
 913                WINBINDD_MAX_SIMULTANEOUS_CLIENTS - 1) {
 914                 DEBUG(5,("winbindd: Exceeding %d client "
 915                          "connections, removing idle "
 916                          "connection.\n",
 917                          WINBINDD_MAX_SIMULTANEOUS_CLIENTS));
 918                 if (!remove_idle_client()) {
 919                         DEBUG(0,("winbindd: Exceeding %d "
 920                                  "client connections, no idle "
 921                                  "connection found\n",
 922                                  WINBINDD_MAX_SIMULTANEOUS_CLIENTS));
 923                         break;
 924                 }
 925         }
 926         new_connection(s->fd, s->privileged);
 927 }
 928
 929 static bool winbindd_setup_listeners(void)
 930 {
 931         struct winbindd_listen_state *pub_state = NULL;
 932         struct winbindd_listen_state *priv_state = NULL;
 933         struct tevent_fd *fde;
 934
 935         pub_state = talloc(winbind_event_context(),
 936                            struct winbindd_listen_state);
 937         if (!pub_state) {
 938                 goto failed;
 939         }
 940
 941         pub_state->privileged = false;
 942         pub_state->fd = open_winbindd_socket();
 943         if (pub_state->fd == -1) {
 944                 goto failed;
 945         }
 946
 947         fde = tevent_add_fd(winbind_event_context(), pub_state, pub_state->fd,
 948                             TEVENT_FD_READ, winbindd_listen_fde_handler,
 949                             pub_state);
 950         if (fde == NULL) {
 951                 close(pub_state->fd);
 952                 goto failed;
 953         }
 954         tevent_fd_set_auto_close(fde);
 955
 956         priv_state = talloc(winbind_event_context(),
 957                             struct winbindd_listen_state);
 958         if (!priv_state) {
 959                 goto failed;
 960         }
 961
 962         priv_state->privileged = true;
 963         priv_state->fd = open_winbindd_priv_socket();
 964         if (priv_state->fd == -1) {
 965                 goto failed;
 966         }
 967
 968         fde = tevent_add_fd(winbind_event_context(), priv_state,
 969                             priv_state->fd, TEVENT_FD_READ,
 970                             winbindd_listen_fde_handler, priv_state);
 971         if (fde == NULL) {
 972                 close(priv_state->fd);
 973                 goto failed;
 974         }
 975         tevent_fd_set_auto_close(fde);
 976
 977         return true;
 978 failed:
 979         TALLOC_FREE(pub_state);
 980         TALLOC_FREE(priv_state);
 981         return false;
 982 }
 983
 984 bool winbindd_use_idmap_cache(void)
 985 {
 986         return !opt_nocache;
 987 }
 988
 989 bool winbindd_use_cache(void)
 990 {
 991         return !opt_nocache;
 992 }
 993
 994 /* Main function */
 995
 996 int main(int argc, char **argv, char **envp)
 997 {
 998         static bool is_daemon = False;
 999         static bool Fork = True;
1000         static bool log_stdout = False;
1001         static bool no_process_group = False;
1002         enum {
1003                 OPT_DAEMON = 1000,
1004                 OPT_FORK,
1005                 OPT_NO_PROCESS_GROUP,
1006                 OPT_LOG_STDOUT
1007         };
1008         struct poptOption long_options[] = {
1009                 POPT_AUTOHELP
1010                 { "stdout", 'S', POPT_ARG_NONE, NULL, OPT_LOG_STDOUT, "Log to stdout" },
1011                 { "foreground", 'F', POPT_ARG_NONE, NULL, OPT_FORK, "Daemon in foreground mode" },
1012                 { "no-process-group", 0, POPT_ARG_NONE, NULL, OPT_NO_PROCESS_GROUP, "Don't create a new process group" },
1013                 { "daemon", 'D', POPT_ARG_NONE, NULL, OPT_DAEMON, "Become a daemon (default)" },
1014                 { "interactive", 'i', POPT_ARG_NONE, NULL, 'i', "Interactive mode" },
1015                 { "no-caching", 'n', POPT_ARG_NONE, NULL, 'n', "Disable caching" },
1016                 POPT_COMMON_SAMBA
1017                 POPT_TABLEEND
1018         };
1019         poptContext pc;
1020         int opt;
1021         TALLOC_CTX *frame = talloc_stackframe();
1022         struct tevent_timer *te;
1023
1024         /* glibc (?) likes to print "User defined signal 1" and exit if a
1025            SIGUSR[12] is received before a handler is installed */
1026
1027         CatchSignal(SIGUSR1, SIG_IGN);
1028         CatchSignal(SIGUSR2, SIG_IGN);
1029
1030         fault_setup((void (*)(void *))fault_quit );
1031         dump_core_setup("winbindd");
1032
1033         load_case_tables();
1034
1035         /* Initialise for running in non-root mode */
1036
1037         sec_init();
1038
1039         set_remote_machine_name("winbindd", False);
1040
1041         /* Set environment variable so we don't recursively call ourselves.
1042            This may also be useful interactively. */
1043
1044         if ( !winbind_off() ) {
1045                 DEBUG(0,("Failed to disable recusive winbindd calls.  Exiting.\n"));
1046                 exit(1);
1047         }
1048
1049         /* Initialise samba/rpc client stuff */
1050
1051         pc = poptGetContext("winbindd", argc, (const char **)argv, long_options, 0);
1052
1053         while ((opt = poptGetNextOpt(pc)) != -1) {
1054                 switch (opt) {
1055                         /* Don't become a daemon */
1056                 case OPT_DAEMON:
1057                         is_daemon = True;
1058                         break;
1059                 case 'i':
1060                         interactive = True;
1061                         log_stdout = True;
1062                         Fork = False;
1063                         break;
1064                 case OPT_FORK:
1065                         Fork = false;
1066                         break;
1067                 case OPT_NO_PROCESS_GROUP:
1068                         no_process_group = true;
1069                         break;
1070                 case OPT_LOG_STDOUT:
1071                         log_stdout = true;
1072                         break;
1073                 case 'n':
1074                         opt_nocache = true;
1075                         break;
1076                 default:
1077                         d_fprintf(stderr, "\nInvalid option %s: %s\n\n",
1078                                   poptBadOption(pc, 0), poptStrerror(opt));
1079                         poptPrintUsage(pc, stderr, 0);
1080                         exit(1);
1081                 }
1082         }
1083
1084         if (is_daemon && interactive) {
1085                 d_fprintf(stderr,"\nERROR: "
1086                           "Option -i|--interactive is not allowed together with -D|--daemon\n\n");
1087                 poptPrintUsage(pc, stderr, 0);
1088                 exit(1);
1089         }
1090
1091         if (log_stdout && Fork) {
1092                 d_fprintf(stderr, "\nERROR: "
1093                           "Can't log to stdout (-S) unless daemon is in foreground +(-F) or interactive (-i)\n\n");
1094                 poptPrintUsage(pc, stderr, 0);
1095                 exit(1);
1096         }
1097
1098         poptFreeContext(pc);
1099
1100         if (!override_logfile) {
1101                 char *lfile = NULL;
1102                 if (asprintf(&lfile,"%s/log.winbindd",
1103                                 get_dyn_LOGFILEBASE()) > 0) {
1104                         lp_set_logfile(lfile);
1105                         SAFE_FREE(lfile);
1106                 }
1107         }
1108         setup_logging("winbindd", log_stdout);
1109         reopen_logs();
1110
1111         DEBUG(0,("winbindd version %s started.\n", samba_version_string()));
1112         DEBUGADD(0,("%s\n", COPYRIGHT_STARTUP_MESSAGE));
1113
1114         if (!lp_load_initial_only(get_dyn_CONFIGFILE())) {
1115                 DEBUG(0, ("error opening config file\n"));
1116                 exit(1);
1117         }
1118
1119         /* Initialise messaging system */
1120
1121         if (winbind_messaging_context() == NULL) {
1122                 exit(1);
1123         }
1124
1125         if (!reload_services_file(NULL)) {
1126                 DEBUG(0, ("error opening config file\n"));
1127                 exit(1);
1128         }
1129
1130         if (!directory_exist(lp_lockdir())) {
1131                 mkdir(lp_lockdir(), 0755);
1132         }
1133
1134         /* Setup names. */
1135
1136         if (!init_names())
1137                 exit(1);
1138
1139         load_interfaces();
1140
1141         if (!secrets_init()) {
1142
1143                 DEBUG(0,("Could not initialize domain trust account secrets. Giving up\n"));
1144                 return False;
1145         }
1146
1147         /* Enable netbios namecache */
1148
1149         namecache_enable();
1150
1151         /* Unblock all signals we are interested in as they may have been
1152            blocked by the parent process. */
1153
1154         BlockSignals(False, SIGINT);
1155         BlockSignals(False, SIGQUIT);
1156         BlockSignals(False, SIGTERM);
1157         BlockSignals(False, SIGUSR1);
1158         BlockSignals(False, SIGUSR2);
1159         BlockSignals(False, SIGHUP);
1160         BlockSignals(False, SIGCHLD);
1161
1162         if (!interactive)
1163                 become_daemon(Fork, no_process_group);
1164
1165         pidfile_create("winbindd");
1166
1167 #if HAVE_SETPGID
1168         /*
1169          * If we're interactive we want to set our own process group for
1170          * signal management.
1171          */
1172         if (interactive && !no_process_group)
1173                 setpgid( (pid_t)0, (pid_t)0);
1174 #endif
1175
1176         TimeInit();
1177
1178         /* Don't use winbindd_reinit_after_fork here as
1179          * we're just starting up and haven't created any
1180          * winbindd-specific resources we must free yet. JRA.
1181          */
1182
1183         if (!NT_STATUS_IS_OK(reinit_after_fork(winbind_messaging_context(),
1184                                                winbind_event_context(),
1185                                                false))) {
1186                 DEBUG(0,("reinit_after_fork() failed\n"));
1187                 exit(1);
1188         }
1189
1190         /* Setup signal handlers */
1191
1192         if (!winbindd_setup_sig_term_handler(true))
1193                 exit(1);
1194         if (!winbindd_setup_sig_hup_handler(NULL))
1195                 exit(1);
1196         if (!winbindd_setup_sig_chld_handler())
1197                 exit(1);
1198         if (!winbindd_setup_sig_usr2_handler())
1199                 exit(1);
1200
1201         CatchSignal(SIGPIPE, SIG_IGN);                 /* Ignore sigpipe */
1202
1203         /*
1204          * Ensure all cache and idmap caches are consistent
1205          * and initialized before we startup.
1206          */
1207         if (!winbindd_cache_validate_and_initialize()) {
1208                 exit(1);
1209         }
1210
1211         /* get broadcast messages */
1212         claim_connection(NULL,"",FLAG_MSG_GENERAL|FLAG_MSG_DBWRAP);
1213
1214         /* React on 'smbcontrol winbindd reload-config' in the same way
1215            as to SIGHUP signal */
1216         messaging_register(winbind_messaging_context(), NULL,
1217                            MSG_SMB_CONF_UPDATED, msg_reload_services);
1218         messaging_register(winbind_messaging_context(), NULL,
1219                            MSG_SHUTDOWN, msg_shutdown);
1220
1221         /* Handle online/offline messages. */
1222         messaging_register(winbind_messaging_context(), NULL,
1223                            MSG_WINBIND_OFFLINE, winbind_msg_offline);
1224         messaging_register(winbind_messaging_context(), NULL,
1225                            MSG_WINBIND_ONLINE, winbind_msg_online);
1226         messaging_register(winbind_messaging_context(), NULL,
1227                            MSG_WINBIND_ONLINESTATUS, winbind_msg_onlinestatus);
1228
1229         messaging_register(winbind_messaging_context(), NULL,
1230                            MSG_DUMP_EVENT_LIST, winbind_msg_dump_event_list);
1231
1232         messaging_register(winbind_messaging_context(), NULL,
1233                            MSG_WINBIND_VALIDATE_CACHE,
1234                            winbind_msg_validate_cache);
1235
1236         messaging_register(winbind_messaging_context(), NULL,
1237                            MSG_WINBIND_DUMP_DOMAIN_LIST,
1238                            winbind_msg_dump_domain_list);
1239
1240         /* Register handler for MSG_DEBUG. */
1241         messaging_register(winbind_messaging_context(), NULL,
1242                            MSG_DEBUG,
1243                            winbind_msg_debug);
1244
1245         netsamlogon_cache_init(); /* Non-critical */
1246
1247         /* clear the cached list of trusted domains */
1248
1249         wcache_tdc_clear();
1250
1251         if (!init_domain_list()) {
1252                 DEBUG(0,("unable to initialize domain list\n"));
1253                 exit(1);
1254         }
1255
1256         init_idmap_child();
1257         init_locator_child();
1258
1259         smb_nscd_flush_user_cache();
1260         smb_nscd_flush_group_cache();
1261
1262         /* setup listen sockets */
1263
1264         if (!winbindd_setup_listeners()) {
1265                 DEBUG(0,("winbindd_setup_listeners() failed\n"));
1266                 exit(1);
1267         }
1268
1269         te = tevent_add_timer(winbind_event_context(), NULL, timeval_zero(),
1270                               rescan_trusted_domains, NULL);
1271         if (te == NULL) {
1272                 DEBUG(0, ("Could not trigger rescan_trusted_domains()\n"));
1273                 exit(1);
1274         }
1275
1276         TALLOC_FREE(frame);
1277         /* Loop waiting for requests */
1278         while (1) {
1279                 frame = talloc_stackframe();
1280
1281                 if (tevent_loop_once(winbind_event_context()) == -1) {
1282                         DEBUG(1, ("tevent_loop_once() failed: %s\n",
1283                                   strerror(errno)));
1284                         return 1;
1285                 }
1286
1287                 TALLOC_FREE(frame);
1288         }
1289
1290         return 0;
1291 }