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 "popt_common.h"
  27 #include "winbindd.h"
  28 #include "nsswitch/winbind_client.h"
  29 #include "lib/wb_reqtrans.h"
  30 #include "librpc/gen_ndr/messaging.h"
  31 #include "../librpc/gen_ndr/srv_lsa.h"
  32 #include "../librpc/gen_ndr/srv_samr.h"
  33 #include "secrets.h"
  34 #include "idmap.h"
  35
  36 #undef DBGC_CLASS
  37 #define DBGC_CLASS DBGC_WINBIND
  38
  39 static bool client_is_idle(struct winbindd_cli_state *state);
  40 static void remove_client(struct winbindd_cli_state *state);
  41
  42 static bool opt_nocache = False;
  43 static bool interactive = False;
  44
  45 extern bool override_logfile;
  46
  47 struct messaging_context *winbind_messaging_context(void)
  48 {
  49         struct messaging_context *msg_ctx = server_messaging_context();
  50         if (likely(msg_ctx != NULL)) {
  51                 return msg_ctx;
  52         }
  53         smb_panic("Could not init winbindd's messaging context.\n");
  54         return NULL;
  55 }
  56
  57 /* Reload configuration */
  58
  59 static bool reload_services_file(const char *lfile)
  60 {
  61         bool ret;
  62
  63         if (lp_loaded()) {
  64                 const char *fname = lp_configfile();
  65
  66                 if (file_exist(fname) && !strcsequal(fname,get_dyn_CONFIGFILE())) {
  67                         set_dyn_CONFIGFILE(fname);
  68                 }
  69         }
  70
  71         /* if this is a child, restore the logfile to the special
  72            name - <domain>, idmap, etc. */
  73         if (lfile && *lfile) {
  74                 lp_set_logfile(lfile);
  75         }
  76
  77         reopen_logs();
  78         ret = lp_load(get_dyn_CONFIGFILE(),False,False,True,True);
  79
  80         reopen_logs();
  81         load_interfaces();
  82
  83         return(ret);
  84 }
  85
  86
  87 /**************************************************************************** **
  88  Handle a fault..
  89  **************************************************************************** */
  90
  91 static void fault_quit(void)
  92 {
  93         dump_core();
  94 }
  95
  96 static void winbindd_status(void)
  97 {
  98         struct winbindd_cli_state *tmp;
  99
 100         DEBUG(0, ("winbindd status:\n"));
 101
 102         /* Print client state information */
 103
 104         DEBUG(0, ("\t%d clients currently active\n", winbindd_num_clients()));
 105
 106         if (DEBUGLEVEL >= 2 && winbindd_num_clients()) {
 107                 DEBUG(2, ("\tclient list:\n"));
 108                 for(tmp = winbindd_client_list(); tmp; tmp = tmp->next) {
 109                         DEBUGADD(2, ("\t\tpid %lu, sock %d (%s)\n",
 110                                      (unsigned long)tmp->pid, tmp->sock,
 111                                      client_is_idle(tmp) ? "idle" : "active"));
 112                 }
 113         }
 114 }
 115
 116 /* Flush client cache */
 117
 118 static void flush_caches(void)
 119 {
 120         /* We need to invalidate cached user list entries on a SIGHUP
 121            otherwise cached access denied errors due to restrict anonymous
 122            hang around until the sequence number changes. */
 123
 124         if (!wcache_invalidate_cache()) {
 125                 DEBUG(0, ("invalidating the cache failed; revalidate the cache\n"));
 126                 if (!winbindd_cache_validate_and_initialize()) {
 127                         exit(1);
 128                 }
 129         }
 130 }
 131
 132 static void flush_caches_noinit(void)
 133 {
 134         /*
 135          * We need to invalidate cached user list entries on a SIGHUP
 136          * otherwise cached access denied errors due to restrict anonymous
 137          * hang around until the sequence number changes.
 138          * NB
 139          * Skip uninitialized domains when flush cache.
 140          * If domain is not initialized, it means it is never
 141          * used or never become online. look, wcache_invalidate_cache()
 142          * -> get_cache() -> init_dc_connection(). It causes a lot of traffic
 143          * for unused domains and large traffic for primay domain's DC if there
 144          * are many domains..
 145          */
 146
 147         if (!wcache_invalidate_cache_noinit()) {
 148                 DEBUG(0, ("invalidating the cache failed; revalidate the cache\n"));
 149                 if (!winbindd_cache_validate_and_initialize()) {
 150                         exit(1);
 151                 }
 152         }
 153 }
 154
 155 /* Handle the signal by unlinking socket and exiting */
 156
 157 static void terminate(bool is_parent)
 158 {
 159         if (is_parent) {
 160                 /* When parent goes away we should
 161                  * remove the socket file. Not so
 162                  * when children terminate.
 163                  */
 164                 char *path = NULL;
 165
 166                 if (asprintf(&path, "%s/%s",
 167                         get_winbind_pipe_dir(), WINBINDD_SOCKET_NAME) > 0) {
 168                         unlink(path);
 169                         SAFE_FREE(path);
 170                 }
 171         }
 172
 173         idmap_close();
 174
 175         trustdom_cache_shutdown();
 176
 177         gencache_stabilize();
 178
 179 #if 0
 180         if (interactive) {
 181                 TALLOC_CTX *mem_ctx = talloc_init("end_description");
 182                 char *description = talloc_describe_all(mem_ctx);
 183
 184                 DEBUG(3, ("tallocs left:\n%s\n", description));
 185                 talloc_destroy(mem_ctx);
 186         }
 187 #endif
 188
 189         if (is_parent) {
 190                 serverid_deregister(procid_self());
 191                 pidfile_unlink();
 192         }
 193
 194         exit(0);
 195 }
 196
 197 static void winbindd_sig_term_handler(struct tevent_context *ev,
 198                                       struct tevent_signal *se,
 199                                       int signum,
 200                                       int count,
 201                                       void *siginfo,
 202                                       void *private_data)
 203 {
 204         bool *is_parent = talloc_get_type_abort(private_data, bool);
 205
 206         DEBUG(0,("Got sig[%d] terminate (is_parent=%d)\n",
 207                  signum, (int)*is_parent));
 208         terminate(*is_parent);
 209 }
 210
 211 bool winbindd_setup_sig_term_handler(bool parent)
 212 {
 213         struct tevent_signal *se;
 214         bool *is_parent;
 215
 216         is_parent = talloc(winbind_event_context(), bool);
 217         if (!is_parent) {
 218                 return false;
 219         }
 220
 221         *is_parent = parent;
 222
 223         se = tevent_add_signal(winbind_event_context(),
 224                                is_parent,
 225                                SIGTERM, 0,
 226                                winbindd_sig_term_handler,
 227                                is_parent);
 228         if (!se) {
 229                 DEBUG(0,("failed to setup SIGTERM handler"));
 230                 talloc_free(is_parent);
 231                 return false;
 232         }
 233
 234         se = tevent_add_signal(winbind_event_context(),
 235                                is_parent,
 236                                SIGINT, 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         se = tevent_add_signal(winbind_event_context(),
 246                                is_parent,
 247                                SIGQUIT, 0,
 248                                winbindd_sig_term_handler,
 249                                is_parent);
 250         if (!se) {
 251                 DEBUG(0,("failed to setup SIGINT handler"));
 252                 talloc_free(is_parent);
 253                 return false;
 254         }
 255
 256         return true;
 257 }
 258
 259 static void winbindd_sig_hup_handler(struct tevent_context *ev,
 260                                      struct tevent_signal *se,
 261                                      int signum,
 262                                      int count,
 263                                      void *siginfo,
 264                                      void *private_data)
 265 {
 266         const char *file = (const char *)private_data;
 267
 268         DEBUG(1,("Reloading services after SIGHUP\n"));
 269         flush_caches_noinit();
 270         reload_services_file(file);
 271 }
 272
 273 bool winbindd_setup_sig_hup_handler(const char *lfile)
 274 {
 275         struct tevent_signal *se;
 276         char *file = NULL;
 277
 278         if (lfile) {
 279                 file = talloc_strdup(winbind_event_context(),
 280                                      lfile);
 281                 if (!file) {
 282                         return false;
 283                 }
 284         }
 285
 286         se = tevent_add_signal(winbind_event_context(),
 287                                winbind_event_context(),
 288                                SIGHUP, 0,
 289                                winbindd_sig_hup_handler,
 290                                file);
 291         if (!se) {
 292                 return false;
 293         }
 294
 295         return true;
 296 }
 297
 298 static void winbindd_sig_chld_handler(struct tevent_context *ev,
 299                                       struct tevent_signal *se,
 300                                       int signum,
 301                                       int count,
 302                                       void *siginfo,
 303                                       void *private_data)
 304 {
 305         pid_t pid;
 306
 307         while ((pid = sys_waitpid(-1, NULL, WNOHANG)) > 0) {
 308                 winbind_child_died(pid);
 309         }
 310 }
 311
 312 static bool winbindd_setup_sig_chld_handler(void)
 313 {
 314         struct tevent_signal *se;
 315
 316         se = tevent_add_signal(winbind_event_context(),
 317                                winbind_event_context(),
 318                                SIGCHLD, 0,
 319                                winbindd_sig_chld_handler,
 320                                NULL);
 321         if (!se) {
 322                 return false;
 323         }
 324
 325         return true;
 326 }
 327
 328 static void winbindd_sig_usr2_handler(struct tevent_context *ev,
 329                                       struct tevent_signal *se,
 330                                       int signum,
 331                                       int count,
 332                                       void *siginfo,
 333                                       void *private_data)
 334 {
 335         winbindd_status();
 336 }
 337
 338 static bool winbindd_setup_sig_usr2_handler(void)
 339 {
 340         struct tevent_signal *se;
 341
 342         se = tevent_add_signal(winbind_event_context(),
 343                                winbind_event_context(),
 344                                SIGUSR2, 0,
 345                                winbindd_sig_usr2_handler,
 346                                NULL);
 347         if (!se) {
 348                 return false;
 349         }
 350
 351         return true;
 352 }
 353
 354 /* React on 'smbcontrol winbindd reload-config' in the same way as on SIGHUP*/
 355 static void msg_reload_services(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         /* Flush various caches */
 362         flush_caches();
 363         reload_services_file((const char *) private_data);
 364 }
 365
 366 /* React on 'smbcontrol winbindd shutdown' in the same way as on SIGTERM*/
 367 static void msg_shutdown(struct messaging_context *msg,
 368                          void *private_data,
 369                          uint32_t msg_type,
 370                          struct server_id server_id,
 371                          DATA_BLOB *data)
 372 {
 373         /* only the parent waits for this message */
 374         DEBUG(0,("Got shutdown message\n"));
 375         terminate(true);
 376 }
 377
 378
 379 static void winbind_msg_validate_cache(struct messaging_context *msg_ctx,
 380                                        void *private_data,
 381                                        uint32_t msg_type,
 382                                        struct server_id server_id,
 383                                        DATA_BLOB *data)
 384 {
 385         uint8 ret;
 386         pid_t child_pid;
 387
 388         DEBUG(10, ("winbindd_msg_validate_cache: got validate-cache "
 389                    "message.\n"));
 390
 391         /*
 392          * call the validation code from a child:
 393          * so we don't block the main winbindd and the validation
 394          * code can safely use fork/waitpid...
 395          */
 396         child_pid = sys_fork();
 397
 398         if (child_pid == -1) {
 399                 DEBUG(1, ("winbind_msg_validate_cache: Could not fork: %s\n",
 400                           strerror(errno)));
 401                 return;
 402         }
 403
 404         if (child_pid != 0) {
 405                 /* parent */
 406                 DEBUG(5, ("winbind_msg_validate_cache: child created with "
 407                           "pid %d.\n", (int)child_pid));
 408                 return;
 409         }
 410
 411         /* child */
 412
 413         if (!winbindd_reinit_after_fork(NULL)) {
 414                 _exit(0);
 415         }
 416
 417         /* install default SIGCHLD handler: validation code uses fork/waitpid */
 418         CatchSignal(SIGCHLD, SIG_DFL);
 419
 420         ret = (uint8)winbindd_validate_cache_nobackup();
 421         DEBUG(10, ("winbindd_msg_validata_cache: got return value %d\n", ret));
 422         messaging_send_buf(msg_ctx, server_id, MSG_WINBIND_VALIDATE_CACHE, &ret,
 423                            (size_t)1);
 424         _exit(0);
 425 }
 426
 427 static struct winbindd_dispatch_table {
 428         enum winbindd_cmd cmd;
 429         void (*fn)(struct winbindd_cli_state *state);
 430         const char *winbindd_cmd_name;
 431 } dispatch_table[] = {
 432
 433         /* Enumeration functions */
 434
 435         { WINBINDD_LIST_TRUSTDOM, winbindd_list_trusted_domains,
 436           "LIST_TRUSTDOM" },
 437
 438         /* Miscellaneous */
 439
 440         { WINBINDD_INFO, winbindd_info, "INFO" },
 441         { WINBINDD_INTERFACE_VERSION, winbindd_interface_version,
 442           "INTERFACE_VERSION" },
 443         { WINBINDD_DOMAIN_NAME, winbindd_domain_name, "DOMAIN_NAME" },
 444         { WINBINDD_DOMAIN_INFO, winbindd_domain_info, "DOMAIN_INFO" },
 445         { WINBINDD_DC_INFO, winbindd_dc_info, "DC_INFO" },
 446         { WINBINDD_NETBIOS_NAME, winbindd_netbios_name, "NETBIOS_NAME" },
 447         { WINBINDD_PRIV_PIPE_DIR, winbindd_priv_pipe_dir,
 448           "WINBINDD_PRIV_PIPE_DIR" },
 449
 450         /* Credential cache access */
 451         { WINBINDD_CCACHE_NTLMAUTH, winbindd_ccache_ntlm_auth, "NTLMAUTH" },
 452         { WINBINDD_CCACHE_SAVE, winbindd_ccache_save, "CCACHE_SAVE" },
 453
 454         /* WINS functions */
 455
 456         { WINBINDD_WINS_BYNAME, winbindd_wins_byname, "WINS_BYNAME" },
 457         { WINBINDD_WINS_BYIP, winbindd_wins_byip, "WINS_BYIP" },
 458
 459         /* End of list */
 460
 461         { WINBINDD_NUM_CMDS, NULL, "NONE" }
 462 };
 463
 464 struct winbindd_async_dispatch_table {
 465         enum winbindd_cmd cmd;
 466         const char *cmd_name;
 467         struct tevent_req *(*send_req)(TALLOC_CTX *mem_ctx,
 468                                        struct tevent_context *ev,
 469                                        struct winbindd_cli_state *cli,
 470                                        struct winbindd_request *request);
 471         NTSTATUS (*recv_req)(struct tevent_req *req,
 472                              struct winbindd_response *presp);
 473 };
 474
 475 static struct winbindd_async_dispatch_table async_nonpriv_table[] = {
 476         { WINBINDD_PING, "PING",
 477           wb_ping_send, wb_ping_recv },
 478         { WINBINDD_LOOKUPSID, "LOOKUPSID",
 479           winbindd_lookupsid_send, winbindd_lookupsid_recv },
 480         { WINBINDD_LOOKUPNAME, "LOOKUPNAME",
 481           winbindd_lookupname_send, winbindd_lookupname_recv },
 482         { WINBINDD_SID_TO_UID, "SID_TO_UID",
 483           winbindd_sid_to_uid_send, winbindd_sid_to_uid_recv },
 484         { WINBINDD_SID_TO_GID, "SID_TO_GID",
 485           winbindd_sid_to_gid_send, winbindd_sid_to_gid_recv },
 486         { WINBINDD_UID_TO_SID, "UID_TO_SID",
 487           winbindd_uid_to_sid_send, winbindd_uid_to_sid_recv },
 488         { WINBINDD_GID_TO_SID, "GID_TO_SID",
 489           winbindd_gid_to_sid_send, winbindd_gid_to_sid_recv },
 490         { WINBINDD_GETPWSID, "GETPWSID",
 491           winbindd_getpwsid_send, winbindd_getpwsid_recv },
 492         { WINBINDD_GETPWNAM, "GETPWNAM",
 493           winbindd_getpwnam_send, winbindd_getpwnam_recv },
 494         { WINBINDD_GETPWUID, "GETPWUID",
 495           winbindd_getpwuid_send, winbindd_getpwuid_recv },
 496         { WINBINDD_GETSIDALIASES, "GETSIDALIASES",
 497           winbindd_getsidaliases_send, winbindd_getsidaliases_recv },
 498         { WINBINDD_GETUSERDOMGROUPS, "GETUSERDOMGROUPS",
 499           winbindd_getuserdomgroups_send, winbindd_getuserdomgroups_recv },
 500         { WINBINDD_GETGROUPS, "GETGROUPS",
 501           winbindd_getgroups_send, winbindd_getgroups_recv },
 502         { WINBINDD_SHOW_SEQUENCE, "SHOW_SEQUENCE",
 503           winbindd_show_sequence_send, winbindd_show_sequence_recv },
 504         { WINBINDD_GETGRGID, "GETGRGID",
 505           winbindd_getgrgid_send, winbindd_getgrgid_recv },
 506         { WINBINDD_GETGRNAM, "GETGRNAM",
 507           winbindd_getgrnam_send, winbindd_getgrnam_recv },
 508         { WINBINDD_GETUSERSIDS, "GETUSERSIDS",
 509           winbindd_getusersids_send, winbindd_getusersids_recv },
 510         { WINBINDD_LOOKUPRIDS, "LOOKUPRIDS",
 511           winbindd_lookuprids_send, winbindd_lookuprids_recv },
 512         { WINBINDD_SETPWENT, "SETPWENT",
 513           winbindd_setpwent_send, winbindd_setpwent_recv },
 514         { WINBINDD_GETPWENT, "GETPWENT",
 515           winbindd_getpwent_send, winbindd_getpwent_recv },
 516         { WINBINDD_ENDPWENT, "ENDPWENT",
 517           winbindd_endpwent_send, winbindd_endpwent_recv },
 518         { WINBINDD_DSGETDCNAME, "DSGETDCNAME",
 519           winbindd_dsgetdcname_send, winbindd_dsgetdcname_recv },
 520         { WINBINDD_GETDCNAME, "GETDCNAME",
 521           winbindd_getdcname_send, winbindd_getdcname_recv },
 522         { WINBINDD_SETGRENT, "SETGRENT",
 523           winbindd_setgrent_send, winbindd_setgrent_recv },
 524         { WINBINDD_GETGRENT, "GETGRENT",
 525           winbindd_getgrent_send, winbindd_getgrent_recv },
 526         { WINBINDD_ENDGRENT, "ENDGRENT",
 527           winbindd_endgrent_send, winbindd_endgrent_recv },
 528         { WINBINDD_LIST_USERS, "LIST_USERS",
 529           winbindd_list_users_send, winbindd_list_users_recv },
 530         { WINBINDD_LIST_GROUPS, "LIST_GROUPS",
 531           winbindd_list_groups_send, winbindd_list_groups_recv },
 532         { WINBINDD_CHECK_MACHACC, "CHECK_MACHACC",
 533           winbindd_check_machine_acct_send, winbindd_check_machine_acct_recv },
 534         { WINBINDD_PING_DC, "PING_DC",
 535           winbindd_ping_dc_send, winbindd_ping_dc_recv },
 536         { WINBINDD_PAM_AUTH, "PAM_AUTH",
 537           winbindd_pam_auth_send, winbindd_pam_auth_recv },
 538         { WINBINDD_PAM_LOGOFF, "PAM_LOGOFF",
 539           winbindd_pam_logoff_send, winbindd_pam_logoff_recv },
 540         { WINBINDD_PAM_CHAUTHTOK, "PAM_CHAUTHTOK",
 541           winbindd_pam_chauthtok_send, winbindd_pam_chauthtok_recv },
 542         { WINBINDD_PAM_CHNG_PSWD_AUTH_CRAP, "PAM_CHNG_PSWD_AUTH_CRAP",
 543           winbindd_pam_chng_pswd_auth_crap_send,
 544           winbindd_pam_chng_pswd_auth_crap_recv },
 545
 546         { 0, NULL, NULL, NULL }
 547 };
 548
 549 static struct winbindd_async_dispatch_table async_priv_table[] = {
 550         { WINBINDD_ALLOCATE_UID, "ALLOCATE_UID",
 551           winbindd_allocate_uid_send, winbindd_allocate_uid_recv },
 552         { WINBINDD_ALLOCATE_GID, "ALLOCATE_GID",
 553           winbindd_allocate_gid_send, winbindd_allocate_gid_recv },
 554         { WINBINDD_CHANGE_MACHACC, "CHANGE_MACHACC",
 555           winbindd_change_machine_acct_send, winbindd_change_machine_acct_recv },
 556         { WINBINDD_PAM_AUTH_CRAP, "PAM_AUTH_CRAP",
 557           winbindd_pam_auth_crap_send, winbindd_pam_auth_crap_recv },
 558
 559         { 0, NULL, NULL, NULL }
 560 };
 561
 562 static void wb_request_done(struct tevent_req *req);
 563
 564 static void process_request(struct winbindd_cli_state *state)
 565 {
 566         struct winbindd_dispatch_table *table = dispatch_table;
 567         struct winbindd_async_dispatch_table *atable;
 568
 569         state->mem_ctx = talloc_named(state, 0, "winbind request");
 570         if (state->mem_ctx == NULL)
 571                 return;
 572
 573         /* Remember who asked us. */
 574         state->pid = state->request->pid;
 575
 576         state->cmd_name = "unknown request";
 577         state->recv_fn = NULL;
 578
 579         /* Process command */
 580
 581         for (atable = async_nonpriv_table; atable->send_req; atable += 1) {
 582                 if (state->request->cmd == atable->cmd) {
 583                         break;
 584                 }
 585         }
 586
 587         if ((atable->send_req == NULL) && state->privileged) {
 588                 for (atable = async_priv_table; atable->send_req;
 589                      atable += 1) {
 590                         if (state->request->cmd == atable->cmd) {
 591                                 break;
 592                         }
 593                 }
 594         }
 595
 596         if (atable->send_req != NULL) {
 597                 struct tevent_req *req;
 598
 599                 state->cmd_name = atable->cmd_name;
 600                 state->recv_fn = atable->recv_req;
 601
 602                 DEBUG(10, ("process_request: Handling async request %d:%s\n",
 603                            (int)state->pid, state->cmd_name));
 604
 605                 req = atable->send_req(state->mem_ctx, winbind_event_context(),
 606                                        state, state->request);
 607                 if (req == NULL) {
 608                         DEBUG(0, ("process_request: atable->send failed for "
 609                                   "%s\n", atable->cmd_name));
 610                         request_error(state);
 611                         return;
 612                 }
 613                 tevent_req_set_callback(req, wb_request_done, state);
 614                 return;
 615         }
 616
 617         state->response = talloc_zero(state->mem_ctx,
 618                                       struct winbindd_response);
 619         if (state->response == NULL) {
 620                 DEBUG(10, ("talloc failed\n"));
 621                 remove_client(state);
 622                 return;
 623         }
 624         state->response->result = WINBINDD_PENDING;
 625         state->response->length = sizeof(struct winbindd_response);
 626
 627         for (table = dispatch_table; table->fn; table++) {
 628                 if (state->request->cmd == table->cmd) {
 629                         DEBUG(10,("process_request: request fn %s\n",
 630                                   table->winbindd_cmd_name ));
 631                         state->cmd_name = table->winbindd_cmd_name;
 632                         table->fn(state);
 633                         break;
 634                 }
 635         }
 636
 637         if (!table->fn) {
 638                 DEBUG(10,("process_request: unknown request fn number %d\n",
 639                           (int)state->request->cmd ));
 640                 request_error(state);
 641         }
 642 }
 643
 644 static void wb_request_done(struct tevent_req *req)
 645 {
 646         struct winbindd_cli_state *state = tevent_req_callback_data(
 647                 req, struct winbindd_cli_state);
 648         NTSTATUS status;
 649
 650         state->response = talloc_zero(state->mem_ctx,
 651                                       struct winbindd_response);
 652         if (state->response == NULL) {
 653                 DEBUG(0, ("wb_request_done[%d:%s]: talloc_zero failed - removing client\n",
 654                           (int)state->pid, state->cmd_name));
 655                 remove_client(state);
 656                 return;
 657         }
 658         state->response->result = WINBINDD_PENDING;
 659         state->response->length = sizeof(struct winbindd_response);
 660
 661         status = state->recv_fn(req, state->response);
 662         TALLOC_FREE(req);
 663
 664         DEBUG(10,("wb_request_done[%d:%s]: %s\n",
 665                   (int)state->pid, state->cmd_name, nt_errstr(status)));
 666
 667         if (!NT_STATUS_IS_OK(status)) {
 668                 request_error(state);
 669                 return;
 670         }
 671         request_ok(state);
 672 }
 673
 674 /*
 675  * This is the main event loop of winbind requests. It goes through a
 676  * state-machine of 3 read/write requests, 4 if you have extra data to send.
 677  *
 678  * An idle winbind client has a read request of 4 bytes outstanding,
 679  * finalizing function is request_len_recv, checking the length. request_recv
 680  * then processes the packet. The processing function then at some point has
 681  * to call request_finished which schedules sending the response.
 682  */
 683
 684 static void request_finished(struct winbindd_cli_state *state);
 685
 686 static void winbind_client_request_read(struct tevent_req *req);
 687 static void winbind_client_response_written(struct tevent_req *req);
 688
 689 static void request_finished(struct winbindd_cli_state *state)
 690 {
 691         struct tevent_req *req;
 692
 693         TALLOC_FREE(state->request);
 694
 695         req = wb_resp_write_send(state, winbind_event_context(),
 696                                  state->out_queue, state->sock,
 697                                  state->response);
 698         if (req == NULL) {
 699                 DEBUG(10,("request_finished[%d:%s]: wb_resp_write_send() failed\n",
 700                           (int)state->pid, state->cmd_name));
 701                 remove_client(state);
 702                 return;
 703         }
 704         tevent_req_set_callback(req, winbind_client_response_written, state);
 705 }
 706
 707 static void winbind_client_response_written(struct tevent_req *req)
 708 {
 709         struct winbindd_cli_state *state = tevent_req_callback_data(
 710                 req, struct winbindd_cli_state);
 711         ssize_t ret;
 712         int err;
 713
 714         ret = wb_resp_write_recv(req, &err);
 715         TALLOC_FREE(req);
 716         if (ret == -1) {
 717                 close(state->sock);
 718                 state->sock = -1;
 719                 DEBUG(2, ("Could not write response[%d:%s] to client: %s\n",
 720                           (int)state->pid, state->cmd_name, strerror(err)));
 721                 remove_client(state);
 722                 return;
 723         }
 724
 725         DEBUG(10,("winbind_client_response_written[%d:%s]: delivered response "
 726                   "to client\n", (int)state->pid, state->cmd_name));
 727
 728         TALLOC_FREE(state->mem_ctx);
 729         state->response = NULL;
 730         state->cmd_name = "no request";
 731         state->recv_fn = NULL;
 732
 733         req = wb_req_read_send(state, winbind_event_context(), state->sock,
 734                                WINBINDD_MAX_EXTRA_DATA);
 735         if (req == NULL) {
 736                 remove_client(state);
 737                 return;
 738         }
 739         tevent_req_set_callback(req, winbind_client_request_read, state);
 740 }
 741
 742 void request_error(struct winbindd_cli_state *state)
 743 {
 744         SMB_ASSERT(state->response->result == WINBINDD_PENDING);
 745         state->response->result = WINBINDD_ERROR;
 746         request_finished(state);
 747 }
 748
 749 void request_ok(struct winbindd_cli_state *state)
 750 {
 751         SMB_ASSERT(state->response->result == WINBINDD_PENDING);
 752         state->response->result = WINBINDD_OK;
 753         request_finished(state);
 754 }
 755
 756 /* Process a new connection by adding it to the client connection list */
 757
 758 static void new_connection(int listen_sock, bool privileged)
 759 {
 760         struct sockaddr_un sunaddr;
 761         struct winbindd_cli_state *state;
 762         struct tevent_req *req;
 763         socklen_t len;
 764         int sock;
 765
 766         /* Accept connection */
 767
 768         len = sizeof(sunaddr);
 769
 770         do {
 771                 sock = accept(listen_sock, (struct sockaddr *)(void *)&sunaddr,
 772                               &len);
 773         } while (sock == -1 && errno == EINTR);
 774
 775         if (sock == -1)
 776                 return;
 777
 778         DEBUG(6,("accepted socket %d\n", sock));
 779
 780         /* Create new connection structure */
 781
 782         if ((state = TALLOC_ZERO_P(NULL, struct winbindd_cli_state)) == NULL) {
 783                 close(sock);
 784                 return;
 785         }
 786
 787         state->sock = sock;
 788
 789         state->out_queue = tevent_queue_create(state, "winbind client reply");
 790         if (state->out_queue == NULL) {
 791                 close(sock);
 792                 TALLOC_FREE(state);
 793                 return;
 794         }
 795
 796         state->last_access = time(NULL);
 797
 798         state->privileged = privileged;
 799
 800         req = wb_req_read_send(state, winbind_event_context(), state->sock,
 801                                WINBINDD_MAX_EXTRA_DATA);
 802         if (req == NULL) {
 803                 TALLOC_FREE(state);
 804                 close(sock);
 805                 return;
 806         }
 807         tevent_req_set_callback(req, winbind_client_request_read, state);
 808
 809         /* Add to connection list */
 810
 811         winbindd_add_client(state);
 812 }
 813
 814 static void winbind_client_request_read(struct tevent_req *req)
 815 {
 816         struct winbindd_cli_state *state = tevent_req_callback_data(
 817                 req, struct winbindd_cli_state);
 818         ssize_t ret;
 819         int err;
 820
 821         ret = wb_req_read_recv(req, state, &state->request, &err);
 822         TALLOC_FREE(req);
 823         if (ret == -1) {
 824                 if (err == EPIPE) {
 825                         DEBUG(6, ("closing socket %d, client exited\n",
 826                                   state->sock));
 827                 } else {
 828                         DEBUG(2, ("Could not read client request from fd %d: "
 829                                   "%s\n", state->sock, strerror(err)));
 830                 }
 831                 close(state->sock);
 832                 state->sock = -1;
 833                 remove_client(state);
 834                 return;
 835         }
 836         process_request(state);
 837 }
 838
 839 /* Remove a client connection from client connection list */
 840
 841 static void remove_client(struct winbindd_cli_state *state)
 842 {
 843         char c = 0;
 844         int nwritten;
 845
 846         /* It's a dead client - hold a funeral */
 847
 848         if (state == NULL) {
 849                 return;
 850         }
 851
 852         if (state->sock != -1) {
 853                 /* tell client, we are closing ... */
 854                 nwritten = write(state->sock, &c, sizeof(c));
 855                 if (nwritten == -1) {
 856                         DEBUG(2, ("final write to client failed: %s\n",
 857                                 strerror(errno)));
 858                 }
 859
 860                 /* Close socket */
 861
 862                 close(state->sock);
 863                 state->sock = -1;
 864         }
 865
 866         TALLOC_FREE(state->mem_ctx);
 867
 868         /* Remove from list and free */
 869
 870         winbindd_remove_client(state);
 871         TALLOC_FREE(state);
 872 }
 873
 874 /* Is a client idle? */
 875
 876 static bool client_is_idle(struct winbindd_cli_state *state) {
 877   return (state->response == NULL &&
 878           !state->pwent_state && !state->grent_state);
 879 }
 880
 881 /* Shutdown client connection which has been idle for the longest time */
 882
 883 static bool remove_idle_client(void)
 884 {
 885         struct winbindd_cli_state *state, *remove_state = NULL;
 886         time_t last_access = 0;
 887         int nidle = 0;
 888
 889         for (state = winbindd_client_list(); state; state = state->next) {
 890                 if (client_is_idle(state)) {
 891                         nidle++;
 892                         if (!last_access || state->last_access < last_access) {
 893                                 last_access = state->last_access;
 894                                 remove_state = state;
 895                         }
 896                 }
 897         }
 898
 899         if (remove_state) {
 900                 DEBUG(5,("Found %d idle client connections, shutting down sock %d, pid %u\n",
 901                         nidle, remove_state->sock, (unsigned int)remove_state->pid));
 902                 remove_client(remove_state);
 903                 return True;
 904         }
 905
 906         return False;
 907 }
 908
 909 struct winbindd_listen_state {
 910         bool privileged;
 911         int fd;
 912 };
 913
 914 static void winbindd_listen_fde_handler(struct tevent_context *ev,
 915                                         struct tevent_fd *fde,
 916                                         uint16_t flags,
 917                                         void *private_data)
 918 {
 919         struct winbindd_listen_state *s = talloc_get_type_abort(private_data,
 920                                           struct winbindd_listen_state);
 921
 922         while (winbindd_num_clients() > lp_winbind_max_clients() - 1) {
 923                 DEBUG(5,("winbindd: Exceeding %d client "
 924                          "connections, removing idle "
 925                          "connection.\n", lp_winbind_max_clients()));
 926                 if (!remove_idle_client()) {
 927                         DEBUG(0,("winbindd: Exceeding %d "
 928                                  "client connections, no idle "
 929                                  "connection found\n",
 930                                  lp_winbind_max_clients()));
 931                         break;
 932                 }
 933         }
 934         new_connection(s->fd, s->privileged);
 935 }
 936
 937 /*
 938  * Winbindd socket accessor functions
 939  */
 940
 941 const char *get_winbind_pipe_dir(void)
 942 {
 943         return lp_parm_const_string(-1, "winbindd", "socket dir", WINBINDD_SOCKET_DIR);
 944 }
 945
 946 char *get_winbind_priv_pipe_dir(void)
 947 {
 948         return lock_path(WINBINDD_PRIV_SOCKET_SUBDIR);
 949 }
 950
 951 static bool winbindd_setup_listeners(void)
 952 {
 953         struct winbindd_listen_state *pub_state = NULL;
 954         struct winbindd_listen_state *priv_state = NULL;
 955         struct tevent_fd *fde;
 956
 957         pub_state = talloc(winbind_event_context(),
 958                            struct winbindd_listen_state);
 959         if (!pub_state) {
 960                 goto failed;
 961         }
 962
 963         pub_state->privileged = false;
 964         pub_state->fd = create_pipe_sock(
 965                 get_winbind_pipe_dir(), WINBINDD_SOCKET_NAME, 0755);
 966         if (pub_state->fd == -1) {
 967                 goto failed;
 968         }
 969
 970         fde = tevent_add_fd(winbind_event_context(), pub_state, pub_state->fd,
 971                             TEVENT_FD_READ, winbindd_listen_fde_handler,
 972                             pub_state);
 973         if (fde == NULL) {
 974                 close(pub_state->fd);
 975                 goto failed;
 976         }
 977         tevent_fd_set_auto_close(fde);
 978
 979         priv_state = talloc(winbind_event_context(),
 980                             struct winbindd_listen_state);
 981         if (!priv_state) {
 982                 goto failed;
 983         }
 984
 985         priv_state->privileged = true;
 986         priv_state->fd = create_pipe_sock(
 987                 get_winbind_priv_pipe_dir(), WINBINDD_SOCKET_NAME, 0750);
 988         if (priv_state->fd == -1) {
 989                 goto failed;
 990         }
 991
 992         fde = tevent_add_fd(winbind_event_context(), priv_state,
 993                             priv_state->fd, TEVENT_FD_READ,
 994                             winbindd_listen_fde_handler, priv_state);
 995         if (fde == NULL) {
 996                 close(priv_state->fd);
 997                 goto failed;
 998         }
 999         tevent_fd_set_auto_close(fde);
1000
1001         return true;
1002 failed:
1003         TALLOC_FREE(pub_state);
1004         TALLOC_FREE(priv_state);
1005         return false;
1006 }
1007
1008 bool winbindd_use_idmap_cache(void)
1009 {
1010         return !opt_nocache;
1011 }
1012
1013 bool winbindd_use_cache(void)
1014 {
1015         return !opt_nocache;
1016 }
1017
1018 void winbindd_register_handlers(void)
1019 {
1020         struct tevent_timer *te;
1021         /* Setup signal handlers */
1022
1023         if (!winbindd_setup_sig_term_handler(true))
1024                 exit(1);
1025         if (!winbindd_setup_sig_hup_handler(NULL))
1026                 exit(1);
1027         if (!winbindd_setup_sig_chld_handler())
1028                 exit(1);
1029         if (!winbindd_setup_sig_usr2_handler())
1030                 exit(1);
1031
1032         CatchSignal(SIGPIPE, SIG_IGN);                 /* Ignore sigpipe */
1033
1034         /*
1035          * Ensure all cache and idmap caches are consistent
1036          * and initialized before we startup.
1037          */
1038         if (!winbindd_cache_validate_and_initialize()) {
1039                 exit(1);
1040         }
1041
1042         /* get broadcast messages */
1043
1044         if (!serverid_register(procid_self(),
1045                                FLAG_MSG_GENERAL|FLAG_MSG_DBWRAP)) {
1046                 DEBUG(1, ("Could not register myself in serverid.tdb\n"));
1047                 exit(1);
1048         }
1049
1050         /* React on 'smbcontrol winbindd reload-config' in the same way
1051            as to SIGHUP signal */
1052         messaging_register(winbind_messaging_context(), NULL,
1053                            MSG_SMB_CONF_UPDATED, msg_reload_services);
1054         messaging_register(winbind_messaging_context(), NULL,
1055                            MSG_SHUTDOWN, msg_shutdown);
1056
1057         /* Handle online/offline messages. */
1058         messaging_register(winbind_messaging_context(), NULL,
1059                            MSG_WINBIND_OFFLINE, winbind_msg_offline);
1060         messaging_register(winbind_messaging_context(), NULL,
1061                            MSG_WINBIND_ONLINE, winbind_msg_online);
1062         messaging_register(winbind_messaging_context(), NULL,
1063                            MSG_WINBIND_ONLINESTATUS, winbind_msg_onlinestatus);
1064
1065         messaging_register(winbind_messaging_context(), NULL,
1066                            MSG_DUMP_EVENT_LIST, winbind_msg_dump_event_list);
1067
1068         messaging_register(winbind_messaging_context(), NULL,
1069                            MSG_WINBIND_VALIDATE_CACHE,
1070                            winbind_msg_validate_cache);
1071
1072         messaging_register(winbind_messaging_context(), NULL,
1073                            MSG_WINBIND_DUMP_DOMAIN_LIST,
1074                            winbind_msg_dump_domain_list);
1075
1076         messaging_register(winbind_messaging_context(), NULL,
1077                            MSG_WINBIND_IP_DROPPED,
1078                            winbind_msg_ip_dropped_parent);
1079
1080         /* Register handler for MSG_DEBUG. */
1081         messaging_register(winbind_messaging_context(), NULL,
1082                            MSG_DEBUG,
1083                            winbind_msg_debug);
1084
1085         netsamlogon_cache_init(); /* Non-critical */
1086
1087         /* clear the cached list of trusted domains */
1088
1089         wcache_tdc_clear();
1090
1091         if (!init_domain_list()) {
1092                 DEBUG(0,("unable to initialize domain list\n"));
1093                 exit(1);
1094         }
1095
1096         init_idmap_child();
1097         init_locator_child();
1098
1099         smb_nscd_flush_user_cache();
1100         smb_nscd_flush_group_cache();
1101
1102         te = tevent_add_timer(winbind_event_context(), NULL, timeval_zero(),
1103                               rescan_trusted_domains, NULL);
1104         if (te == NULL) {
1105                 DEBUG(0, ("Could not trigger rescan_trusted_domains()\n"));
1106                 exit(1);
1107         }
1108
1109 }
1110
1111 /* Main function */
1112
1113 int main(int argc, char **argv, char **envp)
1114 {
1115         static bool is_daemon = False;
1116         static bool Fork = True;
1117         static bool log_stdout = False;
1118         static bool no_process_group = False;
1119         enum {
1120                 OPT_DAEMON = 1000,
1121                 OPT_FORK,
1122                 OPT_NO_PROCESS_GROUP,
1123                 OPT_LOG_STDOUT
1124         };
1125         struct poptOption long_options[] = {
1126                 POPT_AUTOHELP
1127                 { "stdout", 'S', POPT_ARG_NONE, NULL, OPT_LOG_STDOUT, "Log to stdout" },
1128                 { "foreground", 'F', POPT_ARG_NONE, NULL, OPT_FORK, "Daemon in foreground mode" },
1129                 { "no-process-group", 0, POPT_ARG_NONE, NULL, OPT_NO_PROCESS_GROUP, "Don't create a new process group" },
1130                 { "daemon", 'D', POPT_ARG_NONE, NULL, OPT_DAEMON, "Become a daemon (default)" },
1131                 { "interactive", 'i', POPT_ARG_NONE, NULL, 'i', "Interactive mode" },
1132                 { "no-caching", 'n', POPT_ARG_NONE, NULL, 'n', "Disable caching" },
1133                 POPT_COMMON_SAMBA
1134                 POPT_TABLEEND
1135         };
1136         poptContext pc;
1137         int opt;
1138         TALLOC_CTX *frame;
1139         NTSTATUS status;
1140
1141         /*
1142          * Do this before any other talloc operation
1143          */
1144         talloc_enable_null_tracking();
1145         frame = talloc_stackframe();
1146
1147         /* glibc (?) likes to print "User defined signal 1" and exit if a
1148            SIGUSR[12] is received before a handler is installed */
1149
1150         CatchSignal(SIGUSR1, SIG_IGN);
1151         CatchSignal(SIGUSR2, SIG_IGN);
1152
1153         fault_setup((void (*)(void *))fault_quit );
1154         dump_core_setup("winbindd");
1155
1156         load_case_tables();
1157
1158         /* Initialise for running in non-root mode */
1159
1160         sec_init();
1161
1162         set_remote_machine_name("winbindd", False);
1163
1164         /* Set environment variable so we don't recursively call ourselves.
1165            This may also be useful interactively. */
1166
1167         if ( !winbind_off() ) {
1168                 DEBUG(0,("Failed to disable recusive winbindd calls.  Exiting.\n"));
1169                 exit(1);
1170         }
1171
1172         /* Initialise samba/rpc client stuff */
1173
1174         pc = poptGetContext("winbindd", argc, (const char **)argv, long_options, 0);
1175
1176         while ((opt = poptGetNextOpt(pc)) != -1) {
1177                 switch (opt) {
1178                         /* Don't become a daemon */
1179                 case OPT_DAEMON:
1180                         is_daemon = True;
1181                         break;
1182                 case 'i':
1183                         interactive = True;
1184                         log_stdout = True;
1185                         Fork = False;
1186                         break;
1187                 case OPT_FORK:
1188                         Fork = false;
1189                         break;
1190                 case OPT_NO_PROCESS_GROUP:
1191                         no_process_group = true;
1192                         break;
1193                 case OPT_LOG_STDOUT:
1194                         log_stdout = true;
1195                         break;
1196                 case 'n':
1197                         opt_nocache = true;
1198                         break;
1199                 default:
1200                         d_fprintf(stderr, "\nInvalid option %s: %s\n\n",
1201                                   poptBadOption(pc, 0), poptStrerror(opt));
1202                         poptPrintUsage(pc, stderr, 0);
1203                         exit(1);
1204                 }
1205         }
1206
1207         if (is_daemon && interactive) {
1208                 d_fprintf(stderr,"\nERROR: "
1209                           "Option -i|--interactive is not allowed together with -D|--daemon\n\n");
1210                 poptPrintUsage(pc, stderr, 0);
1211                 exit(1);
1212         }
1213
1214         if (log_stdout && Fork) {
1215                 d_fprintf(stderr, "\nERROR: "
1216                           "Can't log to stdout (-S) unless daemon is in foreground +(-F) or interactive (-i)\n\n");
1217                 poptPrintUsage(pc, stderr, 0);
1218                 exit(1);
1219         }
1220
1221         poptFreeContext(pc);
1222
1223         if (!override_logfile) {
1224                 char *lfile = NULL;
1225                 if (asprintf(&lfile,"%s/log.winbindd",
1226                                 get_dyn_LOGFILEBASE()) > 0) {
1227                         lp_set_logfile(lfile);
1228                         SAFE_FREE(lfile);
1229                 }
1230         }
1231         if (log_stdout) {
1232                 setup_logging("winbindd", DEBUG_STDOUT);
1233         } else {
1234                 setup_logging("winbindd", DEBUG_FILE);
1235         }
1236         reopen_logs();
1237
1238         DEBUG(0,("winbindd version %s started.\n", samba_version_string()));
1239         DEBUGADD(0,("%s\n", COPYRIGHT_STARTUP_MESSAGE));
1240
1241         if (!lp_load_initial_only(get_dyn_CONFIGFILE())) {
1242                 DEBUG(0, ("error opening config file\n"));
1243                 exit(1);
1244         }
1245
1246         /* Initialise messaging system */
1247
1248         if (winbind_messaging_context() == NULL) {
1249                 exit(1);
1250         }
1251
1252         if (!reload_services_file(NULL)) {
1253                 DEBUG(0, ("error opening config file\n"));
1254                 exit(1);
1255         }
1256
1257         if (!directory_exist(lp_lockdir())) {
1258                 mkdir(lp_lockdir(), 0755);
1259         }
1260
1261         /* Setup names. */
1262
1263         if (!init_names())
1264                 exit(1);
1265
1266         load_interfaces();
1267
1268         if (!secrets_init()) {
1269
1270                 DEBUG(0,("Could not initialize domain trust account secrets. Giving up\n"));
1271                 return False;
1272         }
1273
1274         /* Unblock all signals we are interested in as they may have been
1275            blocked by the parent process. */
1276
1277         BlockSignals(False, SIGINT);
1278         BlockSignals(False, SIGQUIT);
1279         BlockSignals(False, SIGTERM);
1280         BlockSignals(False, SIGUSR1);
1281         BlockSignals(False, SIGUSR2);
1282         BlockSignals(False, SIGHUP);
1283         BlockSignals(False, SIGCHLD);
1284
1285         if (!interactive)
1286                 become_daemon(Fork, no_process_group, log_stdout);
1287
1288         pidfile_create("winbindd");
1289
1290 #if HAVE_SETPGID
1291         /*
1292          * If we're interactive we want to set our own process group for
1293          * signal management.
1294          */
1295         if (interactive && !no_process_group)
1296                 setpgid( (pid_t)0, (pid_t)0);
1297 #endif
1298
1299         TimeInit();
1300
1301         /* Don't use winbindd_reinit_after_fork here as
1302          * we're just starting up and haven't created any
1303          * winbindd-specific resources we must free yet. JRA.
1304          */
1305
1306         status = reinit_after_fork(winbind_messaging_context(),
1307                                    winbind_event_context(),
1308                                    procid_self(), false);
1309         if (!NT_STATUS_IS_OK(status)) {
1310                 DEBUG(0,("reinit_after_fork() failed\n"));
1311                 exit(1);
1312         }
1313
1314         winbindd_register_handlers();
1315
1316         if (!init_system_info()) {
1317                 DEBUG(0,("ERROR: failed to setup system user info.\n"));
1318                 exit(1);
1319         }
1320
1321         rpc_lsarpc_init(NULL);
1322         rpc_samr_init(NULL);
1323
1324         /* setup listen sockets */
1325
1326         if (!winbindd_setup_listeners()) {
1327                 DEBUG(0,("winbindd_setup_listeners() failed\n"));
1328                 exit(1);
1329         }
1330
1331         TALLOC_FREE(frame);
1332         /* Loop waiting for requests */
1333         while (1) {
1334                 frame = talloc_stackframe();
1335
1336                 if (tevent_loop_once(winbind_event_context()) == -1) {
1337                         DEBUG(1, ("tevent_loop_once() failed: %s\n",
1338                                   strerror(errno)));
1339                         return 1;
1340                 }
1341
1342                 TALLOC_FREE(frame);
1343         }
1344
1345         return 0;
1346 }