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