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_NETBIOS_NAME, winbindd_netbios_name, "NETBIOS_NAME" },
 446         { WINBINDD_PRIV_PIPE_DIR, winbindd_priv_pipe_dir,
 447           "WINBINDD_PRIV_PIPE_DIR" },
 448
 449         /* Credential cache access */
 450         { WINBINDD_CCACHE_NTLMAUTH, winbindd_ccache_ntlm_auth, "NTLMAUTH" },
 451         { WINBINDD_CCACHE_SAVE, winbindd_ccache_save, "CCACHE_SAVE" },
 452
 453         /* WINS functions */
 454
 455         { WINBINDD_WINS_BYNAME, winbindd_wins_byname, "WINS_BYNAME" },
 456         { WINBINDD_WINS_BYIP, winbindd_wins_byip, "WINS_BYIP" },
 457
 458         /* End of list */
 459
 460         { WINBINDD_NUM_CMDS, NULL, "NONE" }
 461 };
 462
 463 struct winbindd_async_dispatch_table {
 464         enum winbindd_cmd cmd;
 465         const char *cmd_name;
 466         struct tevent_req *(*send_req)(TALLOC_CTX *mem_ctx,
 467                                        struct tevent_context *ev,
 468                                        struct winbindd_cli_state *cli,
 469                                        struct winbindd_request *request);
 470         NTSTATUS (*recv_req)(struct tevent_req *req,
 471                              struct winbindd_response *presp);
 472 };
 473
 474 static struct winbindd_async_dispatch_table async_nonpriv_table[] = {
 475         { WINBINDD_PING, "PING",
 476           wb_ping_send, wb_ping_recv },
 477         { WINBINDD_LOOKUPSID, "LOOKUPSID",
 478           winbindd_lookupsid_send, winbindd_lookupsid_recv },
 479         { WINBINDD_LOOKUPNAME, "LOOKUPNAME",
 480           winbindd_lookupname_send, winbindd_lookupname_recv },
 481         { WINBINDD_SID_TO_UID, "SID_TO_UID",
 482           winbindd_sid_to_uid_send, winbindd_sid_to_uid_recv },
 483         { WINBINDD_SID_TO_GID, "SID_TO_GID",
 484           winbindd_sid_to_gid_send, winbindd_sid_to_gid_recv },
 485         { WINBINDD_UID_TO_SID, "UID_TO_SID",
 486           winbindd_uid_to_sid_send, winbindd_uid_to_sid_recv },
 487         { WINBINDD_GID_TO_SID, "GID_TO_SID",
 488           winbindd_gid_to_sid_send, winbindd_gid_to_sid_recv },
 489         { WINBINDD_GETPWSID, "GETPWSID",
 490           winbindd_getpwsid_send, winbindd_getpwsid_recv },
 491         { WINBINDD_GETPWNAM, "GETPWNAM",
 492           winbindd_getpwnam_send, winbindd_getpwnam_recv },
 493         { WINBINDD_GETPWUID, "GETPWUID",
 494           winbindd_getpwuid_send, winbindd_getpwuid_recv },
 495         { WINBINDD_GETSIDALIASES, "GETSIDALIASES",
 496           winbindd_getsidaliases_send, winbindd_getsidaliases_recv },
 497         { WINBINDD_GETUSERDOMGROUPS, "GETUSERDOMGROUPS",
 498           winbindd_getuserdomgroups_send, winbindd_getuserdomgroups_recv },
 499         { WINBINDD_GETGROUPS, "GETGROUPS",
 500           winbindd_getgroups_send, winbindd_getgroups_recv },
 501         { WINBINDD_SHOW_SEQUENCE, "SHOW_SEQUENCE",
 502           winbindd_show_sequence_send, winbindd_show_sequence_recv },
 503         { WINBINDD_GETGRGID, "GETGRGID",
 504           winbindd_getgrgid_send, winbindd_getgrgid_recv },
 505         { WINBINDD_GETGRNAM, "GETGRNAM",
 506           winbindd_getgrnam_send, winbindd_getgrnam_recv },
 507         { WINBINDD_GETUSERSIDS, "GETUSERSIDS",
 508           winbindd_getusersids_send, winbindd_getusersids_recv },
 509         { WINBINDD_LOOKUPRIDS, "LOOKUPRIDS",
 510           winbindd_lookuprids_send, winbindd_lookuprids_recv },
 511         { WINBINDD_SETPWENT, "SETPWENT",
 512           winbindd_setpwent_send, winbindd_setpwent_recv },
 513         { WINBINDD_GETPWENT, "GETPWENT",
 514           winbindd_getpwent_send, winbindd_getpwent_recv },
 515         { WINBINDD_ENDPWENT, "ENDPWENT",
 516           winbindd_endpwent_send, winbindd_endpwent_recv },
 517         { WINBINDD_DSGETDCNAME, "DSGETDCNAME",
 518           winbindd_dsgetdcname_send, winbindd_dsgetdcname_recv },
 519         { WINBINDD_GETDCNAME, "GETDCNAME",
 520           winbindd_getdcname_send, winbindd_getdcname_recv },
 521         { WINBINDD_SETGRENT, "SETGRENT",
 522           winbindd_setgrent_send, winbindd_setgrent_recv },
 523         { WINBINDD_GETGRENT, "GETGRENT",
 524           winbindd_getgrent_send, winbindd_getgrent_recv },
 525         { WINBINDD_ENDGRENT, "ENDGRENT",
 526           winbindd_endgrent_send, winbindd_endgrent_recv },
 527         { WINBINDD_LIST_USERS, "LIST_USERS",
 528           winbindd_list_users_send, winbindd_list_users_recv },
 529         { WINBINDD_LIST_GROUPS, "LIST_GROUPS",
 530           winbindd_list_groups_send, winbindd_list_groups_recv },
 531         { WINBINDD_CHECK_MACHACC, "CHECK_MACHACC",
 532           winbindd_check_machine_acct_send, winbindd_check_machine_acct_recv },
 533         { WINBINDD_PING_DC, "PING_DC",
 534           winbindd_ping_dc_send, winbindd_ping_dc_recv },
 535         { WINBINDD_PAM_AUTH, "PAM_AUTH",
 536           winbindd_pam_auth_send, winbindd_pam_auth_recv },
 537         { WINBINDD_PAM_LOGOFF, "PAM_LOGOFF",
 538           winbindd_pam_logoff_send, winbindd_pam_logoff_recv },
 539         { WINBINDD_PAM_CHAUTHTOK, "PAM_CHAUTHTOK",
 540           winbindd_pam_chauthtok_send, winbindd_pam_chauthtok_recv },
 541         { WINBINDD_PAM_CHNG_PSWD_AUTH_CRAP, "PAM_CHNG_PSWD_AUTH_CRAP",
 542           winbindd_pam_chng_pswd_auth_crap_send,
 543           winbindd_pam_chng_pswd_auth_crap_recv },
 544
 545         { 0, NULL, NULL, NULL }
 546 };
 547
 548 static struct winbindd_async_dispatch_table async_priv_table[] = {
 549         { WINBINDD_ALLOCATE_UID, "ALLOCATE_UID",
 550           winbindd_allocate_uid_send, winbindd_allocate_uid_recv },
 551         { WINBINDD_ALLOCATE_GID, "ALLOCATE_GID",
 552           winbindd_allocate_gid_send, winbindd_allocate_gid_recv },
 553         { WINBINDD_CHANGE_MACHACC, "CHANGE_MACHACC",
 554           winbindd_change_machine_acct_send, winbindd_change_machine_acct_recv },
 555         { WINBINDD_PAM_AUTH_CRAP, "PAM_AUTH_CRAP",
 556           winbindd_pam_auth_crap_send, winbindd_pam_auth_crap_recv },
 557
 558         { 0, NULL, NULL, NULL }
 559 };
 560
 561 static void wb_request_done(struct tevent_req *req);
 562
 563 static void process_request(struct winbindd_cli_state *state)
 564 {
 565         struct winbindd_dispatch_table *table = dispatch_table;
 566         struct winbindd_async_dispatch_table *atable;
 567
 568         state->mem_ctx = talloc_named(state, 0, "winbind request");
 569         if (state->mem_ctx == NULL)
 570                 return;
 571
 572         /* Remember who asked us. */
 573         state->pid = state->request->pid;
 574
 575         state->cmd_name = "unknown request";
 576         state->recv_fn = NULL;
 577
 578         /* Process command */
 579
 580         for (atable = async_nonpriv_table; atable->send_req; atable += 1) {
 581                 if (state->request->cmd == atable->cmd) {
 582                         break;
 583                 }
 584         }
 585
 586         if ((atable->send_req == NULL) && state->privileged) {
 587                 for (atable = async_priv_table; atable->send_req;
 588                      atable += 1) {
 589                         if (state->request->cmd == atable->cmd) {
 590                                 break;
 591                         }
 592                 }
 593         }
 594
 595         if (atable->send_req != NULL) {
 596                 struct tevent_req *req;
 597
 598                 state->cmd_name = atable->cmd_name;
 599                 state->recv_fn = atable->recv_req;
 600
 601                 DEBUG(10, ("process_request: Handling async request %d:%s\n",
 602                            (int)state->pid, state->cmd_name));
 603
 604                 req = atable->send_req(state->mem_ctx, winbind_event_context(),
 605                                        state, state->request);
 606                 if (req == NULL) {
 607                         DEBUG(0, ("process_request: atable->send failed for "
 608                                   "%s\n", atable->cmd_name));
 609                         request_error(state);
 610                         return;
 611                 }
 612                 tevent_req_set_callback(req, wb_request_done, state);
 613                 return;
 614         }
 615
 616         state->response = talloc_zero(state->mem_ctx,
 617                                       struct winbindd_response);
 618         if (state->response == NULL) {
 619                 DEBUG(10, ("talloc failed\n"));
 620                 remove_client(state);
 621                 return;
 622         }
 623         state->response->result = WINBINDD_PENDING;
 624         state->response->length = sizeof(struct winbindd_response);
 625
 626         for (table = dispatch_table; table->fn; table++) {
 627                 if (state->request->cmd == table->cmd) {
 628                         DEBUG(10,("process_request: request fn %s\n",
 629                                   table->winbindd_cmd_name ));
 630                         state->cmd_name = table->winbindd_cmd_name;
 631                         table->fn(state);
 632                         break;
 633                 }
 634         }
 635
 636         if (!table->fn) {
 637                 DEBUG(10,("process_request: unknown request fn number %d\n",
 638                           (int)state->request->cmd ));
 639                 request_error(state);
 640         }
 641 }
 642
 643 static void wb_request_done(struct tevent_req *req)
 644 {
 645         struct winbindd_cli_state *state = tevent_req_callback_data(
 646                 req, struct winbindd_cli_state);
 647         NTSTATUS status;
 648
 649         state->response = talloc_zero(state->mem_ctx,
 650                                       struct winbindd_response);
 651         if (state->response == NULL) {
 652                 DEBUG(0, ("wb_request_done[%d:%s]: talloc_zero failed - removing client\n",
 653                           (int)state->pid, state->cmd_name));
 654                 remove_client(state);
 655                 return;
 656         }
 657         state->response->result = WINBINDD_PENDING;
 658         state->response->length = sizeof(struct winbindd_response);
 659
 660         status = state->recv_fn(req, state->response);
 661         TALLOC_FREE(req);
 662
 663         DEBUG(10,("wb_request_done[%d:%s]: %s\n",
 664                   (int)state->pid, state->cmd_name, nt_errstr(status)));
 665
 666         if (!NT_STATUS_IS_OK(status)) {
 667                 request_error(state);
 668                 return;
 669         }
 670         request_ok(state);
 671 }
 672
 673 /*
 674  * This is the main event loop of winbind requests. It goes through a
 675  * state-machine of 3 read/write requests, 4 if you have extra data to send.
 676  *
 677  * An idle winbind client has a read request of 4 bytes outstanding,
 678  * finalizing function is request_len_recv, checking the length. request_recv
 679  * then processes the packet. The processing function then at some point has
 680  * to call request_finished which schedules sending the response.
 681  */
 682
 683 static void request_finished(struct winbindd_cli_state *state);
 684
 685 static void winbind_client_request_read(struct tevent_req *req);
 686 static void winbind_client_response_written(struct tevent_req *req);
 687
 688 static void request_finished(struct winbindd_cli_state *state)
 689 {
 690         struct tevent_req *req;
 691
 692         TALLOC_FREE(state->request);
 693
 694         req = wb_resp_write_send(state, winbind_event_context(),
 695                                  state->out_queue, state->sock,
 696                                  state->response);
 697         if (req == NULL) {
 698                 DEBUG(10,("request_finished[%d:%s]: wb_resp_write_send() failed\n",
 699                           (int)state->pid, state->cmd_name));
 700                 remove_client(state);
 701                 return;
 702         }
 703         tevent_req_set_callback(req, winbind_client_response_written, state);
 704 }
 705
 706 static void winbind_client_response_written(struct tevent_req *req)
 707 {
 708         struct winbindd_cli_state *state = tevent_req_callback_data(
 709                 req, struct winbindd_cli_state);
 710         ssize_t ret;
 711         int err;
 712
 713         ret = wb_resp_write_recv(req, &err);
 714         TALLOC_FREE(req);
 715         if (ret == -1) {
 716                 close(state->sock);
 717                 state->sock = -1;
 718                 DEBUG(2, ("Could not write response[%d:%s] to client: %s\n",
 719                           (int)state->pid, state->cmd_name, strerror(err)));
 720                 remove_client(state);
 721                 return;
 722         }
 723
 724         DEBUG(10,("winbind_client_response_written[%d:%s]: delivered response "
 725                   "to client\n", (int)state->pid, state->cmd_name));
 726
 727         TALLOC_FREE(state->mem_ctx);
 728         state->response = NULL;
 729         state->cmd_name = "no request";
 730         state->recv_fn = NULL;
 731
 732         req = wb_req_read_send(state, winbind_event_context(), state->sock,
 733                                WINBINDD_MAX_EXTRA_DATA);
 734         if (req == NULL) {
 735                 remove_client(state);
 736                 return;
 737         }
 738         tevent_req_set_callback(req, winbind_client_request_read, state);
 739 }
 740
 741 void request_error(struct winbindd_cli_state *state)
 742 {
 743         SMB_ASSERT(state->response->result == WINBINDD_PENDING);
 744         state->response->result = WINBINDD_ERROR;
 745         request_finished(state);
 746 }
 747
 748 void request_ok(struct winbindd_cli_state *state)
 749 {
 750         SMB_ASSERT(state->response->result == WINBINDD_PENDING);
 751         state->response->result = WINBINDD_OK;
 752         request_finished(state);
 753 }
 754
 755 /* Process a new connection by adding it to the client connection list */
 756
 757 static void new_connection(int listen_sock, bool privileged)
 758 {
 759         struct sockaddr_un sunaddr;
 760         struct winbindd_cli_state *state;
 761         struct tevent_req *req;
 762         socklen_t len;
 763         int sock;
 764
 765         /* Accept connection */
 766
 767         len = sizeof(sunaddr);
 768
 769         do {
 770                 sock = accept(listen_sock, (struct sockaddr *)(void *)&sunaddr,
 771                               &len);
 772         } while (sock == -1 && errno == EINTR);
 773
 774         if (sock == -1)
 775                 return;
 776
 777         DEBUG(6,("accepted socket %d\n", sock));
 778
 779         /* Create new connection structure */
 780
 781         if ((state = TALLOC_ZERO_P(NULL, struct winbindd_cli_state)) == NULL) {
 782                 close(sock);
 783                 return;
 784         }
 785
 786         state->sock = sock;
 787
 788         state->out_queue = tevent_queue_create(state, "winbind client reply");
 789         if (state->out_queue == NULL) {
 790                 close(sock);
 791                 TALLOC_FREE(state);
 792                 return;
 793         }
 794
 795         state->last_access = time(NULL);
 796
 797         state->privileged = privileged;
 798
 799         req = wb_req_read_send(state, winbind_event_context(), state->sock,
 800                                WINBINDD_MAX_EXTRA_DATA);
 801         if (req == NULL) {
 802                 TALLOC_FREE(state);
 803                 close(sock);
 804                 return;
 805         }
 806         tevent_req_set_callback(req, winbind_client_request_read, state);
 807
 808         /* Add to connection list */
 809
 810         winbindd_add_client(state);
 811 }
 812
 813 static void winbind_client_request_read(struct tevent_req *req)
 814 {
 815         struct winbindd_cli_state *state = tevent_req_callback_data(
 816                 req, struct winbindd_cli_state);
 817         ssize_t ret;
 818         int err;
 819
 820         ret = wb_req_read_recv(req, state, &state->request, &err);
 821         TALLOC_FREE(req);
 822         if (ret == -1) {
 823                 if (err == EPIPE) {
 824                         DEBUG(6, ("closing socket %d, client exited\n",
 825                                   state->sock));
 826                 } else {
 827                         DEBUG(2, ("Could not read client request from fd %d: "
 828                                   "%s\n", state->sock, strerror(err)));
 829                 }
 830                 close(state->sock);
 831                 state->sock = -1;
 832                 remove_client(state);
 833                 return;
 834         }
 835         process_request(state);
 836 }
 837
 838 /* Remove a client connection from client connection list */
 839
 840 static void remove_client(struct winbindd_cli_state *state)
 841 {
 842         char c = 0;
 843         int nwritten;
 844
 845         /* It's a dead client - hold a funeral */
 846
 847         if (state == NULL) {
 848                 return;
 849         }
 850
 851         if (state->sock != -1) {
 852                 /* tell client, we are closing ... */
 853                 nwritten = write(state->sock, &c, sizeof(c));
 854                 if (nwritten == -1) {
 855                         DEBUG(2, ("final write to client failed: %s\n",
 856                                 strerror(errno)));
 857                 }
 858
 859                 /* Close socket */
 860
 861                 close(state->sock);
 862                 state->sock = -1;
 863         }
 864
 865         TALLOC_FREE(state->mem_ctx);
 866
 867         /* Remove from list and free */
 868
 869         winbindd_remove_client(state);
 870         TALLOC_FREE(state);
 871 }
 872
 873 /* Is a client idle? */
 874
 875 static bool client_is_idle(struct winbindd_cli_state *state) {
 876   return (state->response == NULL &&
 877           !state->pwent_state && !state->grent_state);
 878 }
 879
 880 /* Shutdown client connection which has been idle for the longest time */
 881
 882 static bool remove_idle_client(void)
 883 {
 884         struct winbindd_cli_state *state, *remove_state = NULL;
 885         time_t last_access = 0;
 886         int nidle = 0;
 887
 888         for (state = winbindd_client_list(); state; state = state->next) {
 889                 if (client_is_idle(state)) {
 890                         nidle++;
 891                         if (!last_access || state->last_access < last_access) {
 892                                 last_access = state->last_access;
 893                                 remove_state = state;
 894                         }
 895                 }
 896         }
 897
 898         if (remove_state) {
 899                 DEBUG(5,("Found %d idle client connections, shutting down sock %d, pid %u\n",
 900                         nidle, remove_state->sock, (unsigned int)remove_state->pid));
 901                 remove_client(remove_state);
 902                 return True;
 903         }
 904
 905         return False;
 906 }
 907
 908 struct winbindd_listen_state {
 909         bool privileged;
 910         int fd;
 911 };
 912
 913 static void winbindd_listen_fde_handler(struct tevent_context *ev,
 914                                         struct tevent_fd *fde,
 915                                         uint16_t flags,
 916                                         void *private_data)
 917 {
 918         struct winbindd_listen_state *s = talloc_get_type_abort(private_data,
 919                                           struct winbindd_listen_state);
 920
 921         while (winbindd_num_clients() > lp_winbind_max_clients() - 1) {
 922                 DEBUG(5,("winbindd: Exceeding %d client "
 923                          "connections, removing idle "
 924                          "connection.\n", lp_winbind_max_clients()));
 925                 if (!remove_idle_client()) {
 926                         DEBUG(0,("winbindd: Exceeding %d "
 927                                  "client connections, no idle "
 928                                  "connection found\n",
 929                                  lp_winbind_max_clients()));
 930                         break;
 931                 }
 932         }
 933         new_connection(s->fd, s->privileged);
 934 }
 935
 936 /*
 937  * Winbindd socket accessor functions
 938  */
 939
 940 const char *get_winbind_pipe_dir(void)
 941 {
 942         return lp_parm_const_string(-1, "winbindd", "socket dir", WINBINDD_SOCKET_DIR);
 943 }
 944
 945 char *get_winbind_priv_pipe_dir(void)
 946 {
 947         return lock_path(WINBINDD_PRIV_SOCKET_SUBDIR);
 948 }
 949
 950 static bool winbindd_setup_listeners(void)
 951 {
 952         struct winbindd_listen_state *pub_state = NULL;
 953         struct winbindd_listen_state *priv_state = NULL;
 954         struct tevent_fd *fde;
 955
 956         pub_state = talloc(winbind_event_context(),
 957                            struct winbindd_listen_state);
 958         if (!pub_state) {
 959                 goto failed;
 960         }
 961
 962         pub_state->privileged = false;
 963         pub_state->fd = create_pipe_sock(
 964                 get_winbind_pipe_dir(), WINBINDD_SOCKET_NAME, 0755);
 965         if (pub_state->fd == -1) {
 966                 goto failed;
 967         }
 968
 969         fde = tevent_add_fd(winbind_event_context(), pub_state, pub_state->fd,
 970                             TEVENT_FD_READ, winbindd_listen_fde_handler,
 971                             pub_state);
 972         if (fde == NULL) {
 973                 close(pub_state->fd);
 974                 goto failed;
 975         }
 976         tevent_fd_set_auto_close(fde);
 977
 978         priv_state = talloc(winbind_event_context(),
 979                             struct winbindd_listen_state);
 980         if (!priv_state) {
 981                 goto failed;
 982         }
 983
 984         priv_state->privileged = true;
 985         priv_state->fd = create_pipe_sock(
 986                 get_winbind_priv_pipe_dir(), WINBINDD_SOCKET_NAME, 0750);
 987         if (priv_state->fd == -1) {
 988                 goto failed;
 989         }
 990
 991         fde = tevent_add_fd(winbind_event_context(), priv_state,
 992                             priv_state->fd, TEVENT_FD_READ,
 993                             winbindd_listen_fde_handler, priv_state);
 994         if (fde == NULL) {
 995                 close(priv_state->fd);
 996                 goto failed;
 997         }
 998         tevent_fd_set_auto_close(fde);
 999
1000         return true;
1001 failed:
1002         TALLOC_FREE(pub_state);
1003         TALLOC_FREE(priv_state);
1004         return false;
1005 }
1006
1007 bool winbindd_use_idmap_cache(void)
1008 {
1009         return !opt_nocache;
1010 }
1011
1012 bool winbindd_use_cache(void)
1013 {
1014         return !opt_nocache;
1015 }
1016
1017 void winbindd_register_handlers(void)
1018 {
1019         struct tevent_timer *te;
1020         /* Setup signal handlers */
1021
1022         if (!winbindd_setup_sig_term_handler(true))
1023                 exit(1);
1024         if (!winbindd_setup_sig_hup_handler(NULL))
1025                 exit(1);
1026         if (!winbindd_setup_sig_chld_handler())
1027                 exit(1);
1028         if (!winbindd_setup_sig_usr2_handler())
1029                 exit(1);
1030
1031         CatchSignal(SIGPIPE, SIG_IGN);                 /* Ignore sigpipe */
1032
1033         /*
1034          * Ensure all cache and idmap caches are consistent
1035          * and initialized before we startup.
1036          */
1037         if (!winbindd_cache_validate_and_initialize()) {
1038                 exit(1);
1039         }
1040
1041         /* get broadcast messages */
1042
1043         if (!serverid_register(procid_self(),
1044                                FLAG_MSG_GENERAL|FLAG_MSG_DBWRAP)) {
1045                 DEBUG(1, ("Could not register myself in serverid.tdb\n"));
1046                 exit(1);
1047         }
1048
1049         /* React on 'smbcontrol winbindd reload-config' in the same way
1050            as to SIGHUP signal */
1051         messaging_register(winbind_messaging_context(), NULL,
1052                            MSG_SMB_CONF_UPDATED, msg_reload_services);
1053         messaging_register(winbind_messaging_context(), NULL,
1054                            MSG_SHUTDOWN, msg_shutdown);
1055
1056         /* Handle online/offline messages. */
1057         messaging_register(winbind_messaging_context(), NULL,
1058                            MSG_WINBIND_OFFLINE, winbind_msg_offline);
1059         messaging_register(winbind_messaging_context(), NULL,
1060                            MSG_WINBIND_ONLINE, winbind_msg_online);
1061         messaging_register(winbind_messaging_context(), NULL,
1062                            MSG_WINBIND_ONLINESTATUS, winbind_msg_onlinestatus);
1063
1064         messaging_register(winbind_messaging_context(), NULL,
1065                            MSG_DUMP_EVENT_LIST, winbind_msg_dump_event_list);
1066
1067         messaging_register(winbind_messaging_context(), NULL,
1068                            MSG_WINBIND_VALIDATE_CACHE,
1069                            winbind_msg_validate_cache);
1070
1071         messaging_register(winbind_messaging_context(), NULL,
1072                            MSG_WINBIND_DUMP_DOMAIN_LIST,
1073                            winbind_msg_dump_domain_list);
1074
1075         messaging_register(winbind_messaging_context(), NULL,
1076                            MSG_WINBIND_IP_DROPPED,
1077                            winbind_msg_ip_dropped_parent);
1078
1079         /* Register handler for MSG_DEBUG. */
1080         messaging_register(winbind_messaging_context(), NULL,
1081                            MSG_DEBUG,
1082                            winbind_msg_debug);
1083
1084         netsamlogon_cache_init(); /* Non-critical */
1085
1086         /* clear the cached list of trusted domains */
1087
1088         wcache_tdc_clear();
1089
1090         if (!init_domain_list()) {
1091                 DEBUG(0,("unable to initialize domain list\n"));
1092                 exit(1);
1093         }
1094
1095         init_idmap_child();
1096         init_locator_child();
1097
1098         smb_nscd_flush_user_cache();
1099         smb_nscd_flush_group_cache();
1100
1101         te = tevent_add_timer(winbind_event_context(), NULL, timeval_zero(),
1102                               rescan_trusted_domains, NULL);
1103         if (te == NULL) {
1104                 DEBUG(0, ("Could not trigger rescan_trusted_domains()\n"));
1105                 exit(1);
1106         }
1107
1108 }
1109
1110 /* Main function */
1111
1112 int main(int argc, char **argv, char **envp)
1113 {
1114         static bool is_daemon = False;
1115         static bool Fork = True;
1116         static bool log_stdout = False;
1117         static bool no_process_group = False;
1118         enum {
1119                 OPT_DAEMON = 1000,
1120                 OPT_FORK,
1121                 OPT_NO_PROCESS_GROUP,
1122                 OPT_LOG_STDOUT
1123         };
1124         struct poptOption long_options[] = {
1125                 POPT_AUTOHELP
1126                 { "stdout", 'S', POPT_ARG_NONE, NULL, OPT_LOG_STDOUT, "Log to stdout" },
1127                 { "foreground", 'F', POPT_ARG_NONE, NULL, OPT_FORK, "Daemon in foreground mode" },
1128                 { "no-process-group", 0, POPT_ARG_NONE, NULL, OPT_NO_PROCESS_GROUP, "Don't create a new process group" },
1129                 { "daemon", 'D', POPT_ARG_NONE, NULL, OPT_DAEMON, "Become a daemon (default)" },
1130                 { "interactive", 'i', POPT_ARG_NONE, NULL, 'i', "Interactive mode" },
1131                 { "no-caching", 'n', POPT_ARG_NONE, NULL, 'n', "Disable caching" },
1132                 POPT_COMMON_SAMBA
1133                 POPT_TABLEEND
1134         };
1135         poptContext pc;
1136         int opt;
1137         TALLOC_CTX *frame;
1138         NTSTATUS status;
1139
1140         /*
1141          * Do this before any other talloc operation
1142          */
1143         talloc_enable_null_tracking();
1144         frame = talloc_stackframe();
1145
1146         /* glibc (?) likes to print "User defined signal 1" and exit if a
1147            SIGUSR[12] is received before a handler is installed */
1148
1149         CatchSignal(SIGUSR1, SIG_IGN);
1150         CatchSignal(SIGUSR2, SIG_IGN);
1151
1152         fault_setup((void (*)(void *))fault_quit );
1153         dump_core_setup("winbindd");
1154
1155         load_case_tables();
1156
1157         /* Initialise for running in non-root mode */
1158
1159         sec_init();
1160
1161         set_remote_machine_name("winbindd", False);
1162
1163         /* Set environment variable so we don't recursively call ourselves.
1164            This may also be useful interactively. */
1165
1166         if ( !winbind_off() ) {
1167                 DEBUG(0,("Failed to disable recusive winbindd calls.  Exiting.\n"));
1168                 exit(1);
1169         }
1170
1171         /* Initialise samba/rpc client stuff */
1172
1173         pc = poptGetContext("winbindd", argc, (const char **)argv, long_options, 0);
1174
1175         while ((opt = poptGetNextOpt(pc)) != -1) {
1176                 switch (opt) {
1177                         /* Don't become a daemon */
1178                 case OPT_DAEMON:
1179                         is_daemon = True;
1180                         break;
1181                 case 'i':
1182                         interactive = True;
1183                         log_stdout = True;
1184                         Fork = False;
1185                         break;
1186                 case OPT_FORK:
1187                         Fork = false;
1188                         break;
1189                 case OPT_NO_PROCESS_GROUP:
1190                         no_process_group = true;
1191                         break;
1192                 case OPT_LOG_STDOUT:
1193                         log_stdout = true;
1194                         break;
1195                 case 'n':
1196                         opt_nocache = true;
1197                         break;
1198                 default:
1199                         d_fprintf(stderr, "\nInvalid option %s: %s\n\n",
1200                                   poptBadOption(pc, 0), poptStrerror(opt));
1201                         poptPrintUsage(pc, stderr, 0);
1202                         exit(1);
1203                 }
1204         }
1205
1206         if (is_daemon && interactive) {
1207                 d_fprintf(stderr,"\nERROR: "
1208                           "Option -i|--interactive is not allowed together with -D|--daemon\n\n");
1209                 poptPrintUsage(pc, stderr, 0);
1210                 exit(1);
1211         }
1212
1213         if (log_stdout && Fork) {
1214                 d_fprintf(stderr, "\nERROR: "
1215                           "Can't log to stdout (-S) unless daemon is in foreground +(-F) or interactive (-i)\n\n");
1216                 poptPrintUsage(pc, stderr, 0);
1217                 exit(1);
1218         }
1219
1220         poptFreeContext(pc);
1221
1222         if (!override_logfile) {
1223                 char *lfile = NULL;
1224                 if (asprintf(&lfile,"%s/log.winbindd",
1225                                 get_dyn_LOGFILEBASE()) > 0) {
1226                         lp_set_logfile(lfile);
1227                         SAFE_FREE(lfile);
1228                 }
1229         }
1230         if (log_stdout) {
1231                 setup_logging("winbindd", DEBUG_STDOUT);
1232         } else {
1233                 setup_logging("winbindd", DEBUG_FILE);
1234         }
1235         reopen_logs();
1236
1237         DEBUG(0,("winbindd version %s started.\n", samba_version_string()));
1238         DEBUGADD(0,("%s\n", COPYRIGHT_STARTUP_MESSAGE));
1239
1240         if (!lp_load_initial_only(get_dyn_CONFIGFILE())) {
1241                 DEBUG(0, ("error opening config file\n"));
1242                 exit(1);
1243         }
1244
1245         /* Initialise messaging system */
1246
1247         if (winbind_messaging_context() == NULL) {
1248                 exit(1);
1249         }
1250
1251         if (!reload_services_file(NULL)) {
1252                 DEBUG(0, ("error opening config file\n"));
1253                 exit(1);
1254         }
1255
1256         if (!directory_exist(lp_lockdir())) {
1257                 mkdir(lp_lockdir(), 0755);
1258         }
1259
1260         /* Setup names. */
1261
1262         if (!init_names())
1263                 exit(1);
1264
1265         load_interfaces();
1266
1267         if (!secrets_init()) {
1268
1269                 DEBUG(0,("Could not initialize domain trust account secrets. Giving up\n"));
1270                 return False;
1271         }
1272
1273         /* Unblock all signals we are interested in as they may have been
1274            blocked by the parent process. */
1275
1276         BlockSignals(False, SIGINT);
1277         BlockSignals(False, SIGQUIT);
1278         BlockSignals(False, SIGTERM);
1279         BlockSignals(False, SIGUSR1);
1280         BlockSignals(False, SIGUSR2);
1281         BlockSignals(False, SIGHUP);
1282         BlockSignals(False, SIGCHLD);
1283
1284         if (!interactive)
1285                 become_daemon(Fork, no_process_group, log_stdout);
1286
1287         pidfile_create("winbindd");
1288
1289 #if HAVE_SETPGID
1290         /*
1291          * If we're interactive we want to set our own process group for
1292          * signal management.
1293          */
1294         if (interactive && !no_process_group)
1295                 setpgid( (pid_t)0, (pid_t)0);
1296 #endif
1297
1298         TimeInit();
1299
1300         /* Don't use winbindd_reinit_after_fork here as
1301          * we're just starting up and haven't created any
1302          * winbindd-specific resources we must free yet. JRA.
1303          */
1304
1305         status = reinit_after_fork(winbind_messaging_context(),
1306                                    winbind_event_context(),
1307                                    procid_self(), false);
1308         if (!NT_STATUS_IS_OK(status)) {
1309                 DEBUG(0,("reinit_after_fork() failed\n"));
1310                 exit(1);
1311         }
1312
1313         winbindd_register_handlers();
1314
1315         if (!init_system_info()) {
1316                 DEBUG(0,("ERROR: failed to setup system user info.\n"));
1317                 exit(1);
1318         }
1319
1320         rpc_lsarpc_init(NULL);
1321         rpc_samr_init(NULL);
1322
1323         /* setup listen sockets */
1324
1325         if (!winbindd_setup_listeners()) {
1326                 DEBUG(0,("winbindd_setup_listeners() failed\n"));
1327                 exit(1);
1328         }
1329
1330         TALLOC_FREE(frame);
1331         /* Loop waiting for requests */
1332         while (1) {
1333                 frame = talloc_stackframe();
1334
1335                 if (tevent_loop_once(winbind_event_context()) == -1) {
1336                         DEBUG(1, ("tevent_loop_once() failed: %s\n",
1337                                   strerror(errno)));
1338                         return 1;
1339                 }
1340
1341                 TALLOC_FREE(frame);
1342         }
1343
1344         return 0;
1345 }