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