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
 455         /* WINS functions */
 456
 457         { WINBINDD_WINS_BYNAME, winbindd_wins_byname, "WINS_BYNAME" },
 458         { WINBINDD_WINS_BYIP, winbindd_wins_byip, "WINS_BYIP" },
 459
 460         /* End of list */
 461
 462         { WINBINDD_NUM_CMDS, NULL, "NONE" }
 463 };
 464
 465 struct winbindd_async_dispatch_table {
 466         enum winbindd_cmd cmd;
 467         const char *cmd_name;
 468         struct tevent_req *(*send_req)(TALLOC_CTX *mem_ctx,
 469                                        struct tevent_context *ev,
 470                                        struct winbindd_cli_state *cli,
 471                                        struct winbindd_request *request);
 472         NTSTATUS (*recv_req)(struct tevent_req *req,
 473                              struct winbindd_response *presp);
 474 };
 475
 476 static struct winbindd_async_dispatch_table async_nonpriv_table[] = {
 477         { WINBINDD_PING, "PING",
 478           wb_ping_send, wb_ping_recv },
 479         { WINBINDD_LOOKUPSID, "LOOKUPSID",
 480           winbindd_lookupsid_send, winbindd_lookupsid_recv },
 481         { WINBINDD_LOOKUPNAME, "LOOKUPNAME",
 482           winbindd_lookupname_send, winbindd_lookupname_recv },
 483         { WINBINDD_SID_TO_UID, "SID_TO_UID",
 484           winbindd_sid_to_uid_send, winbindd_sid_to_uid_recv },
 485         { WINBINDD_SID_TO_GID, "SID_TO_GID",
 486           winbindd_sid_to_gid_send, winbindd_sid_to_gid_recv },
 487         { WINBINDD_UID_TO_SID, "UID_TO_SID",
 488           winbindd_uid_to_sid_send, winbindd_uid_to_sid_recv },
 489         { WINBINDD_GID_TO_SID, "GID_TO_SID",
 490           winbindd_gid_to_sid_send, winbindd_gid_to_sid_recv },
 491         { WINBINDD_GETPWSID, "GETPWSID",
 492           winbindd_getpwsid_send, winbindd_getpwsid_recv },
 493         { WINBINDD_GETPWNAM, "GETPWNAM",
 494           winbindd_getpwnam_send, winbindd_getpwnam_recv },
 495         { WINBINDD_GETPWUID, "GETPWUID",
 496           winbindd_getpwuid_send, winbindd_getpwuid_recv },
 497         { WINBINDD_GETSIDALIASES, "GETSIDALIASES",
 498           winbindd_getsidaliases_send, winbindd_getsidaliases_recv },
 499         { WINBINDD_GETUSERDOMGROUPS, "GETUSERDOMGROUPS",
 500           winbindd_getuserdomgroups_send, winbindd_getuserdomgroups_recv },
 501         { WINBINDD_GETGROUPS, "GETGROUPS",
 502           winbindd_getgroups_send, winbindd_getgroups_recv },
 503         { WINBINDD_SHOW_SEQUENCE, "SHOW_SEQUENCE",
 504           winbindd_show_sequence_send, winbindd_show_sequence_recv },
 505         { WINBINDD_GETGRGID, "GETGRGID",
 506           winbindd_getgrgid_send, winbindd_getgrgid_recv },
 507         { WINBINDD_GETGRNAM, "GETGRNAM",
 508           winbindd_getgrnam_send, winbindd_getgrnam_recv },
 509         { WINBINDD_GETUSERSIDS, "GETUSERSIDS",
 510           winbindd_getusersids_send, winbindd_getusersids_recv },
 511         { WINBINDD_LOOKUPRIDS, "LOOKUPRIDS",
 512           winbindd_lookuprids_send, winbindd_lookuprids_recv },
 513         { WINBINDD_SETPWENT, "SETPWENT",
 514           winbindd_setpwent_send, winbindd_setpwent_recv },
 515         { WINBINDD_GETPWENT, "GETPWENT",
 516           winbindd_getpwent_send, winbindd_getpwent_recv },
 517         { WINBINDD_ENDPWENT, "ENDPWENT",
 518           winbindd_endpwent_send, winbindd_endpwent_recv },
 519         { WINBINDD_DSGETDCNAME, "DSGETDCNAME",
 520           winbindd_dsgetdcname_send, winbindd_dsgetdcname_recv },
 521         { WINBINDD_GETDCNAME, "GETDCNAME",
 522           winbindd_getdcname_send, winbindd_getdcname_recv },
 523         { WINBINDD_SETGRENT, "SETGRENT",
 524           winbindd_setgrent_send, winbindd_setgrent_recv },
 525         { WINBINDD_GETGRENT, "GETGRENT",
 526           winbindd_getgrent_send, winbindd_getgrent_recv },
 527         { WINBINDD_ENDGRENT, "ENDGRENT",
 528           winbindd_endgrent_send, winbindd_endgrent_recv },
 529         { WINBINDD_LIST_USERS, "LIST_USERS",
 530           winbindd_list_users_send, winbindd_list_users_recv },
 531         { WINBINDD_LIST_GROUPS, "LIST_GROUPS",
 532           winbindd_list_groups_send, winbindd_list_groups_recv },
 533         { WINBINDD_CHECK_MACHACC, "CHECK_MACHACC",
 534           winbindd_check_machine_acct_send, winbindd_check_machine_acct_recv },
 535
 536         { 0, NULL, NULL, NULL }
 537 };
 538
 539 static struct winbindd_async_dispatch_table async_priv_table[] = {
 540         { WINBINDD_ALLOCATE_UID, "ALLOCATE_UID",
 541           winbindd_allocate_uid_send, winbindd_allocate_uid_recv },
 542         { WINBINDD_ALLOCATE_GID, "ALLOCATE_GID",
 543           winbindd_allocate_gid_send, winbindd_allocate_gid_recv },
 544         { WINBINDD_SET_MAPPING, "SET_MAPPING",
 545           winbindd_set_mapping_send, winbindd_set_mapping_recv },
 546         { WINBINDD_REMOVE_MAPPING, "SET_MAPPING",
 547           winbindd_remove_mapping_send, winbindd_remove_mapping_recv },
 548         { WINBINDD_SET_HWM, "SET_HWM",
 549           winbindd_set_hwm_send, winbindd_set_hwm_recv },
 550
 551         { 0, NULL, NULL, NULL }
 552 };
 553
 554 static void wb_request_done(struct tevent_req *req);
 555
 556 static void process_request(struct winbindd_cli_state *state)
 557 {
 558         struct winbindd_dispatch_table *table = dispatch_table;
 559         struct winbindd_async_dispatch_table *atable;
 560
 561         state->mem_ctx = talloc_init("winbind request");
 562         if (state->mem_ctx == NULL)
 563                 return;
 564
 565         /* Remember who asked us. */
 566         state->pid = state->request->pid;
 567
 568         /* Process command */
 569
 570         for (atable = async_nonpriv_table; atable->send_req; atable += 1) {
 571                 if (state->request->cmd == atable->cmd) {
 572                         break;
 573                 }
 574         }
 575
 576         if ((atable->send_req == NULL) && state->privileged) {
 577                 for (atable = async_priv_table; atable->send_req;
 578                      atable += 1) {
 579                         if (state->request->cmd == atable->cmd) {
 580                                 break;
 581                         }
 582                 }
 583         }
 584
 585         if (atable->send_req != NULL) {
 586                 struct tevent_req *req;
 587
 588                 DEBUG(10, ("process_request: Handling async request %s\n",
 589                            atable->cmd_name));
 590
 591                 req = atable->send_req(state->mem_ctx, winbind_event_context(),
 592                                        state, state->request);
 593                 if (req == NULL) {
 594                         DEBUG(0, ("process_request: atable->send failed for "
 595                                   "%s\n", atable->cmd_name));
 596                         request_error(state);
 597                         return;
 598                 }
 599                 tevent_req_set_callback(req, wb_request_done, state);
 600                 state->recv_fn = atable->recv_req;
 601                 return;
 602         }
 603
 604         state->response = talloc_zero(state->mem_ctx,
 605                                       struct winbindd_response);
 606         if (state->response == NULL) {
 607                 DEBUG(10, ("talloc failed\n"));
 608                 remove_client(state);
 609                 return;
 610         }
 611         state->response->result = WINBINDD_PENDING;
 612         state->response->length = sizeof(struct winbindd_response);
 613
 614         for (table = dispatch_table; table->fn; table++) {
 615                 if (state->request->cmd == table->cmd) {
 616                         DEBUG(10,("process_request: request fn %s\n",
 617                                   table->winbindd_cmd_name ));
 618                         table->fn(state);
 619                         break;
 620                 }
 621         }
 622
 623         if (!table->fn) {
 624                 DEBUG(10,("process_request: unknown request fn number %d\n",
 625                           (int)state->request->cmd ));
 626                 request_error(state);
 627         }
 628 }
 629
 630 static void wb_request_done(struct tevent_req *req)
 631 {
 632         struct winbindd_cli_state *state = tevent_req_callback_data(
 633                 req, struct winbindd_cli_state);
 634         NTSTATUS status;
 635
 636         state->response = talloc_zero(state, struct winbindd_response);
 637         if (state->response == NULL) {
 638                 remove_client(state);
 639                 return;
 640         }
 641         state->response->result = WINBINDD_PENDING;
 642         state->response->length = sizeof(struct winbindd_response);
 643
 644         status = state->recv_fn(req, state->response);
 645         TALLOC_FREE(req);
 646         if (!NT_STATUS_IS_OK(status)) {
 647                 DEBUG(10, ("returning %s\n", nt_errstr(status)));
 648                 request_error(state);
 649                 return;
 650         }
 651         request_ok(state);
 652 }
 653
 654 /*
 655  * This is the main event loop of winbind requests. It goes through a
 656  * state-machine of 3 read/write requests, 4 if you have extra data to send.
 657  *
 658  * An idle winbind client has a read request of 4 bytes outstanding,
 659  * finalizing function is request_len_recv, checking the length. request_recv
 660  * then processes the packet. The processing function then at some point has
 661  * to call request_finished which schedules sending the response.
 662  */
 663
 664 static void request_finished(struct winbindd_cli_state *state);
 665
 666 static void winbind_client_request_read(struct tevent_req *req);
 667 static void winbind_client_response_written(struct tevent_req *req);
 668
 669 static void request_finished(struct winbindd_cli_state *state)
 670 {
 671         struct tevent_req *req;
 672
 673         TALLOC_FREE(state->request);
 674
 675         req = wb_resp_write_send(state, winbind_event_context(),
 676                                  state->out_queue, state->sock,
 677                                  state->response);
 678         if (req == NULL) {
 679                 remove_client(state);
 680                 return;
 681         }
 682         tevent_req_set_callback(req, winbind_client_response_written, state);
 683 }
 684
 685 static void winbind_client_response_written(struct tevent_req *req)
 686 {
 687         struct winbindd_cli_state *state = tevent_req_callback_data(
 688                 req, struct winbindd_cli_state);
 689         ssize_t ret;
 690         int err;
 691
 692         ret = wb_resp_write_recv(req, &err);
 693         TALLOC_FREE(req);
 694         if (ret == -1) {
 695                 DEBUG(2, ("Could not write response to client: %s\n",
 696                           strerror(err)));
 697                 remove_client(state);
 698                 return;
 699         }
 700
 701         TALLOC_FREE(state->mem_ctx);
 702         state->response = NULL;
 703
 704         req = wb_req_read_send(state, winbind_event_context(), state->sock,
 705                                WINBINDD_MAX_EXTRA_DATA);
 706         if (req == NULL) {
 707                 remove_client(state);
 708                 return;
 709         }
 710         tevent_req_set_callback(req, winbind_client_request_read, state);
 711 }
 712
 713 void request_error(struct winbindd_cli_state *state)
 714 {
 715         SMB_ASSERT(state->response->result == WINBINDD_PENDING);
 716         state->response->result = WINBINDD_ERROR;
 717         request_finished(state);
 718 }
 719
 720 void request_ok(struct winbindd_cli_state *state)
 721 {
 722         SMB_ASSERT(state->response->result == WINBINDD_PENDING);
 723         state->response->result = WINBINDD_OK;
 724         request_finished(state);
 725 }
 726
 727 /* Process a new connection by adding it to the client connection list */
 728
 729 static void new_connection(int listen_sock, bool privileged)
 730 {
 731         struct sockaddr_un sunaddr;
 732         struct winbindd_cli_state *state;
 733         struct tevent_req *req;
 734         socklen_t len;
 735         int sock;
 736
 737         /* Accept connection */
 738
 739         len = sizeof(sunaddr);
 740
 741         do {
 742                 sock = accept(listen_sock, (struct sockaddr *)(void *)&sunaddr,
 743                               &len);
 744         } while (sock == -1 && errno == EINTR);
 745
 746         if (sock == -1)
 747                 return;
 748
 749         DEBUG(6,("accepted socket %d\n", sock));
 750
 751         /* Create new connection structure */
 752
 753         if ((state = TALLOC_ZERO_P(NULL, struct winbindd_cli_state)) == NULL) {
 754                 close(sock);
 755                 return;
 756         }
 757
 758         state->sock = sock;
 759
 760         state->out_queue = tevent_queue_create(state, "winbind client reply");
 761         if (state->out_queue == NULL) {
 762                 close(sock);
 763                 TALLOC_FREE(state);
 764                 return;
 765         }
 766
 767         state->last_access = time(NULL);
 768
 769         state->privileged = privileged;
 770
 771         req = wb_req_read_send(state, winbind_event_context(), state->sock,
 772                                WINBINDD_MAX_EXTRA_DATA);
 773         if (req == NULL) {
 774                 TALLOC_FREE(state);
 775                 close(sock);
 776                 return;
 777         }
 778         tevent_req_set_callback(req, winbind_client_request_read, state);
 779
 780         /* Add to connection list */
 781
 782         winbindd_add_client(state);
 783 }
 784
 785 static void winbind_client_request_read(struct tevent_req *req)
 786 {
 787         struct winbindd_cli_state *state = tevent_req_callback_data(
 788                 req, struct winbindd_cli_state);
 789         ssize_t ret;
 790         int err;
 791
 792         ret = wb_req_read_recv(req, state, &state->request, &err);
 793         TALLOC_FREE(req);
 794         if (ret == -1) {
 795                 DEBUG(2, ("Could not read client request: %s\n",
 796                           strerror(err)));
 797                 remove_client(state);
 798                 return;
 799         }
 800         process_request(state);
 801 }
 802
 803 /* Remove a client connection from client connection list */
 804
 805 static void remove_client(struct winbindd_cli_state *state)
 806 {
 807         char c = 0;
 808         int nwritten;
 809
 810         /* It's a dead client - hold a funeral */
 811
 812         if (state == NULL) {
 813                 return;
 814         }
 815
 816         /* tell client, we are closing ... */
 817         nwritten = write(state->sock, &c, sizeof(c));
 818         if (nwritten == -1) {
 819                 /*
 820                  * ignore EPIPE error here, because the other end might
 821                  * have already closed the socket.
 822                  */
 823                 if (errno != EPIPE) {
 824                         DEBUG(2, ("final write to client failed: %s\n",
 825                                 strerror(errno)));
 826                 }
 827         }
 828
 829         /* Close socket */
 830
 831         close(state->sock);
 832
 833         /* Free any getent state */
 834
 835         free_getent_state(state->getgrent_state);
 836
 837         TALLOC_FREE(state->mem_ctx);
 838
 839         /* Remove from list and free */
 840
 841         winbindd_remove_client(state);
 842         TALLOC_FREE(state);
 843 }
 844
 845 /* Shutdown client connection which has been idle for the longest time */
 846
 847 static bool remove_idle_client(void)
 848 {
 849         struct winbindd_cli_state *state, *remove_state = NULL;
 850         time_t last_access = 0;
 851         int nidle = 0;
 852
 853         for (state = winbindd_client_list(); state; state = state->next) {
 854                 if (state->response == NULL &&
 855                     !state->pwent_state && !state->getgrent_state) {
 856                         nidle++;
 857                         if (!last_access || state->last_access < last_access) {
 858                                 last_access = state->last_access;
 859                                 remove_state = state;
 860                         }
 861                 }
 862         }
 863
 864         if (remove_state) {
 865                 DEBUG(5,("Found %d idle client connections, shutting down sock %d, pid %u\n",
 866                         nidle, remove_state->sock, (unsigned int)remove_state->pid));
 867                 remove_client(remove_state);
 868                 return True;
 869         }
 870
 871         return False;
 872 }
 873
 874 struct winbindd_listen_state {
 875         bool privileged;
 876         int fd;
 877 };
 878
 879 static void winbindd_listen_fde_handler(struct tevent_context *ev,
 880                                         struct tevent_fd *fde,
 881                                         uint16_t flags,
 882                                         void *private_data)
 883 {
 884         struct winbindd_listen_state *s = talloc_get_type_abort(private_data,
 885                                           struct winbindd_listen_state);
 886
 887         while (winbindd_num_clients() >
 888                WINBINDD_MAX_SIMULTANEOUS_CLIENTS - 1) {
 889                 DEBUG(5,("winbindd: Exceeding %d client "
 890                          "connections, removing idle "
 891                          "connection.\n",
 892                          WINBINDD_MAX_SIMULTANEOUS_CLIENTS));
 893                 if (!remove_idle_client()) {
 894                         DEBUG(0,("winbindd: Exceeding %d "
 895                                  "client connections, no idle "
 896                                  "connection found\n",
 897                                  WINBINDD_MAX_SIMULTANEOUS_CLIENTS));
 898                         break;
 899                 }
 900         }
 901         new_connection(s->fd, s->privileged);
 902 }
 903
 904 static bool winbindd_setup_listeners(void)
 905 {
 906         struct winbindd_listen_state *pub_state = NULL;
 907         struct winbindd_listen_state *priv_state = NULL;
 908         struct tevent_fd *fde;
 909
 910         pub_state = talloc(winbind_event_context(),
 911                            struct winbindd_listen_state);
 912         if (!pub_state) {
 913                 goto failed;
 914         }
 915
 916         pub_state->privileged = false;
 917         pub_state->fd = open_winbindd_socket();
 918         if (pub_state->fd == -1) {
 919                 goto failed;
 920         }
 921
 922         fde = tevent_add_fd(winbind_event_context(), pub_state, pub_state->fd,
 923                             TEVENT_FD_READ, winbindd_listen_fde_handler,
 924                             pub_state);
 925         if (fde == NULL) {
 926                 close(pub_state->fd);
 927                 goto failed;
 928         }
 929         tevent_fd_set_auto_close(fde);
 930
 931         priv_state = talloc(winbind_event_context(),
 932                             struct winbindd_listen_state);
 933         if (!priv_state) {
 934                 goto failed;
 935         }
 936
 937         priv_state->privileged = true;
 938         priv_state->fd = open_winbindd_priv_socket();
 939         if (priv_state->fd == -1) {
 940                 goto failed;
 941         }
 942
 943         fde = tevent_add_fd(winbind_event_context(), priv_state,
 944                             priv_state->fd, TEVENT_FD_READ,
 945                             winbindd_listen_fde_handler, priv_state);
 946         if (fde == NULL) {
 947                 close(priv_state->fd);
 948                 goto failed;
 949         }
 950         tevent_fd_set_auto_close(fde);
 951
 952         return true;
 953 failed:
 954         TALLOC_FREE(pub_state);
 955         TALLOC_FREE(priv_state);
 956         return false;
 957 }
 958
 959 bool winbindd_use_idmap_cache(void)
 960 {
 961         return !opt_nocache;
 962 }
 963
 964 bool winbindd_use_cache(void)
 965 {
 966         return !opt_nocache;
 967 }
 968
 969 /* Main function */
 970
 971 int main(int argc, char **argv, char **envp)
 972 {
 973         static bool is_daemon = False;
 974         static bool Fork = True;
 975         static bool log_stdout = False;
 976         static bool no_process_group = False;
 977         enum {
 978                 OPT_DAEMON = 1000,
 979                 OPT_FORK,
 980                 OPT_NO_PROCESS_GROUP,
 981                 OPT_LOG_STDOUT
 982         };
 983         struct poptOption long_options[] = {
 984                 POPT_AUTOHELP
 985                 { "stdout", 'S', POPT_ARG_NONE, NULL, OPT_LOG_STDOUT, "Log to stdout" },
 986                 { "foreground", 'F', POPT_ARG_NONE, NULL, OPT_FORK, "Daemon in foreground mode" },
 987                 { "no-process-group", 0, POPT_ARG_NONE, NULL, OPT_NO_PROCESS_GROUP, "Don't create a new process group" },
 988                 { "daemon", 'D', POPT_ARG_NONE, NULL, OPT_DAEMON, "Become a daemon (default)" },
 989                 { "interactive", 'i', POPT_ARG_NONE, NULL, 'i', "Interactive mode" },
 990                 { "no-caching", 'n', POPT_ARG_NONE, NULL, 'n', "Disable caching" },
 991                 POPT_COMMON_SAMBA
 992                 POPT_TABLEEND
 993         };
 994         poptContext pc;
 995         int opt;
 996         TALLOC_CTX *frame = talloc_stackframe();
 997         struct tevent_timer *te;
 998
 999         /* glibc (?) likes to print "User defined signal 1" and exit if a
1000            SIGUSR[12] is received before a handler is installed */
1001
1002         CatchSignal(SIGUSR1, SIG_IGN);
1003         CatchSignal(SIGUSR2, SIG_IGN);
1004
1005         fault_setup((void (*)(void *))fault_quit );
1006         dump_core_setup("winbindd");
1007
1008         load_case_tables();
1009
1010         /* Initialise for running in non-root mode */
1011
1012         sec_init();
1013
1014         set_remote_machine_name("winbindd", False);
1015
1016         /* Set environment variable so we don't recursively call ourselves.
1017            This may also be useful interactively. */
1018
1019         if ( !winbind_off() ) {
1020                 DEBUG(0,("Failed to disable recusive winbindd calls.  Exiting.\n"));
1021                 exit(1);
1022         }
1023
1024         /* Initialise samba/rpc client stuff */
1025
1026         pc = poptGetContext("winbindd", argc, (const char **)argv, long_options, 0);
1027
1028         while ((opt = poptGetNextOpt(pc)) != -1) {
1029                 switch (opt) {
1030                         /* Don't become a daemon */
1031                 case OPT_DAEMON:
1032                         is_daemon = True;
1033                         break;
1034                 case 'i':
1035                         interactive = True;
1036                         log_stdout = True;
1037                         Fork = False;
1038                         break;
1039                 case OPT_FORK:
1040                         Fork = false;
1041                         break;
1042                 case OPT_NO_PROCESS_GROUP:
1043                         no_process_group = true;
1044                         break;
1045                 case OPT_LOG_STDOUT:
1046                         log_stdout = true;
1047                         break;
1048                 case 'n':
1049                         opt_nocache = true;
1050                         break;
1051                 default:
1052                         d_fprintf(stderr, "\nInvalid option %s: %s\n\n",
1053                                   poptBadOption(pc, 0), poptStrerror(opt));
1054                         poptPrintUsage(pc, stderr, 0);
1055                         exit(1);
1056                 }
1057         }
1058
1059         if (is_daemon && interactive) {
1060                 d_fprintf(stderr,"\nERROR: "
1061                           "Option -i|--interactive is not allowed together with -D|--daemon\n\n");
1062                 poptPrintUsage(pc, stderr, 0);
1063                 exit(1);
1064         }
1065
1066         if (log_stdout && Fork) {
1067                 d_fprintf(stderr, "\nERROR: "
1068                           "Can't log to stdout (-S) unless daemon is in foreground +(-F) or interactive (-i)\n\n");
1069                 poptPrintUsage(pc, stderr, 0);
1070                 exit(1);
1071         }
1072
1073         poptFreeContext(pc);
1074
1075         if (!override_logfile) {
1076                 char *lfile = NULL;
1077                 if (asprintf(&lfile,"%s/log.winbindd",
1078                                 get_dyn_LOGFILEBASE()) > 0) {
1079                         lp_set_logfile(lfile);
1080                         SAFE_FREE(lfile);
1081                 }
1082         }
1083         setup_logging("winbindd", log_stdout);
1084         reopen_logs();
1085
1086         DEBUG(0,("winbindd version %s started.\n", samba_version_string()));
1087         DEBUGADD(0,("%s\n", COPYRIGHT_STARTUP_MESSAGE));
1088
1089         if (!lp_load_initial_only(get_dyn_CONFIGFILE())) {
1090                 DEBUG(0, ("error opening config file\n"));
1091                 exit(1);
1092         }
1093
1094         /* Initialise messaging system */
1095
1096         if (winbind_messaging_context() == NULL) {
1097                 exit(1);
1098         }
1099
1100         if (!reload_services_file(NULL)) {
1101                 DEBUG(0, ("error opening config file\n"));
1102                 exit(1);
1103         }
1104
1105         if (!directory_exist(lp_lockdir())) {
1106                 mkdir(lp_lockdir(), 0755);
1107         }
1108
1109         /* Setup names. */
1110
1111         if (!init_names())
1112                 exit(1);
1113
1114         load_interfaces();
1115
1116         if (!secrets_init()) {
1117
1118                 DEBUG(0,("Could not initialize domain trust account secrets. Giving up\n"));
1119                 return False;
1120         }
1121
1122         /* Enable netbios namecache */
1123
1124         namecache_enable();
1125
1126         /* Unblock all signals we are interested in as they may have been
1127            blocked by the parent process. */
1128
1129         BlockSignals(False, SIGINT);
1130         BlockSignals(False, SIGQUIT);
1131         BlockSignals(False, SIGTERM);
1132         BlockSignals(False, SIGUSR1);
1133         BlockSignals(False, SIGUSR2);
1134         BlockSignals(False, SIGHUP);
1135         BlockSignals(False, SIGCHLD);
1136
1137         if (!interactive)
1138                 become_daemon(Fork, no_process_group);
1139
1140         pidfile_create("winbindd");
1141
1142 #if HAVE_SETPGID
1143         /*
1144          * If we're interactive we want to set our own process group for
1145          * signal management.
1146          */
1147         if (interactive && !no_process_group)
1148                 setpgid( (pid_t)0, (pid_t)0);
1149 #endif
1150
1151         TimeInit();
1152
1153         /* Don't use winbindd_reinit_after_fork here as
1154          * we're just starting up and haven't created any
1155          * winbindd-specific resources we must free yet. JRA.
1156          */
1157
1158         if (!NT_STATUS_IS_OK(reinit_after_fork(winbind_messaging_context(),
1159                                                winbind_event_context(),
1160                                                false))) {
1161                 DEBUG(0,("reinit_after_fork() failed\n"));
1162                 exit(1);
1163         }
1164
1165         /* Setup signal handlers */
1166
1167         if (!winbindd_setup_sig_term_handler(true))
1168                 exit(1);
1169         if (!winbindd_setup_sig_hup_handler(NULL))
1170                 exit(1);
1171         if (!winbindd_setup_sig_chld_handler())
1172                 exit(1);
1173         if (!winbindd_setup_sig_usr2_handler())
1174                 exit(1);
1175
1176         CatchSignal(SIGPIPE, SIG_IGN);                 /* Ignore sigpipe */
1177
1178         /*
1179          * Ensure all cache and idmap caches are consistent
1180          * and initialized before we startup.
1181          */
1182         if (!winbindd_cache_validate_and_initialize()) {
1183                 exit(1);
1184         }
1185
1186         /* get broadcast messages */
1187         claim_connection(NULL,"",FLAG_MSG_GENERAL|FLAG_MSG_DBWRAP);
1188
1189         /* React on 'smbcontrol winbindd reload-config' in the same way
1190            as to SIGHUP signal */
1191         messaging_register(winbind_messaging_context(), NULL,
1192                            MSG_SMB_CONF_UPDATED, msg_reload_services);
1193         messaging_register(winbind_messaging_context(), NULL,
1194                            MSG_SHUTDOWN, msg_shutdown);
1195
1196         /* Handle online/offline messages. */
1197         messaging_register(winbind_messaging_context(), NULL,
1198                            MSG_WINBIND_OFFLINE, winbind_msg_offline);
1199         messaging_register(winbind_messaging_context(), NULL,
1200                            MSG_WINBIND_ONLINE, winbind_msg_online);
1201         messaging_register(winbind_messaging_context(), NULL,
1202                            MSG_WINBIND_ONLINESTATUS, winbind_msg_onlinestatus);
1203
1204         messaging_register(winbind_messaging_context(), NULL,
1205                            MSG_DUMP_EVENT_LIST, winbind_msg_dump_event_list);
1206
1207         messaging_register(winbind_messaging_context(), NULL,
1208                            MSG_WINBIND_VALIDATE_CACHE,
1209                            winbind_msg_validate_cache);
1210
1211         messaging_register(winbind_messaging_context(), NULL,
1212                            MSG_WINBIND_DUMP_DOMAIN_LIST,
1213                            winbind_msg_dump_domain_list);
1214
1215         /* Register handler for MSG_DEBUG. */
1216         messaging_register(winbind_messaging_context(), NULL,
1217                            MSG_DEBUG,
1218                            winbind_msg_debug);
1219
1220         netsamlogon_cache_init(); /* Non-critical */
1221
1222         /* clear the cached list of trusted domains */
1223
1224         wcache_tdc_clear();
1225
1226         if (!init_domain_list()) {
1227                 DEBUG(0,("unable to initialize domain list\n"));
1228                 exit(1);
1229         }
1230
1231         init_idmap_child();
1232         init_locator_child();
1233
1234         smb_nscd_flush_user_cache();
1235         smb_nscd_flush_group_cache();
1236
1237         /* setup listen sockets */
1238
1239         if (!winbindd_setup_listeners()) {
1240                 DEBUG(0,("winbindd_setup_listeners() failed\n"));
1241                 exit(1);
1242         }
1243
1244         te = tevent_add_timer(winbind_event_context(), NULL, timeval_zero(),
1245                               rescan_trusted_domains, NULL);
1246         if (te == NULL) {
1247                 DEBUG(0, ("Could not trigger rescan_trusted_domains()\n"));
1248                 exit(1);
1249         }
1250
1251         TALLOC_FREE(frame);
1252         /* Loop waiting for requests */
1253         while (1) {
1254                 frame = talloc_stackframe();
1255
1256                 if (tevent_loop_once(winbind_event_context()) == -1) {
1257                         DEBUG(1, ("tevent_loop_once() failed: %s\n",
1258                                   strerror(errno)));
1259                         return 1;
1260                 }
1261
1262                 TALLOC_FREE(frame);
1263         }
1264
1265         return 0;
1266 }