source3/winbindd/winbindd.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3
   4    Winbind daemon for ntdom nss module
   5
   6    Copyright (C) by Tim Potter 2000-2002
   7    Copyright (C) Andrew Tridgell 2002
   8    Copyright (C) Jelmer Vernooij 2003
   9    Copyright (C) Volker Lendecke 2004
  10
  11    This program is free software; you can redistribute it and/or modify
  12    it under the terms of the GNU General Public License as published by
  13    the Free Software Foundation; either version 3 of the License, or
  14    (at your option) any later version.
  15
  16    This program is distributed in the hope that it will be useful,
  17    but WITHOUT ANY WARRANTY; without even the implied warranty of
  18    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19    GNU General Public License for more details.
  20
  21    You should have received a copy of the GNU General Public License
  22    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  23 */
  24
  25 #include "includes.h"
  26 #include "winbindd.h"
  27 #include "../../nsswitch/libwbclient/wbc_async.h"
  28 #include "librpc/gen_ndr/messaging.h"
  29 #include "../librpc/gen_ndr/srv_lsa.h"
  30 #include "../librpc/gen_ndr/srv_samr.h"
  31 #include "secrets.h"
  32
  33 #undef DBGC_CLASS
  34 #define DBGC_CLASS DBGC_WINBIND
  35
  36 static void remove_client(struct winbindd_cli_state *state);
  37
  38 static bool opt_nocache = False;
  39 static bool interactive = False;
  40
  41 extern bool override_logfile;
  42
  43 /* Reload configuration */
  44
  45 static bool reload_services_file(const char *lfile)
  46 {
  47         bool ret;
  48
  49         if (lp_loaded()) {
  50                 const char *fname = lp_configfile();
  51
  52                 if (file_exist(fname) && !strcsequal(fname,get_dyn_CONFIGFILE())) {
  53                         set_dyn_CONFIGFILE(fname);
  54                 }
  55         }
  56
  57         /* if this is a child, restore the logfile to the special
  58            name - <domain>, idmap, etc. */
  59         if (lfile && *lfile) {
  60                 lp_set_logfile(lfile);
  61         }
  62
  63         reopen_logs();
  64         ret = lp_load(get_dyn_CONFIGFILE(),False,False,True,True);
  65
  66         reopen_logs();
  67         load_interfaces();
  68
  69         return(ret);
  70 }
  71
  72
  73 /**************************************************************************** **
  74  Handle a fault..
  75  **************************************************************************** */
  76
  77 static void fault_quit(void)
  78 {
  79         dump_core();
  80 }
  81
  82 static void winbindd_status(void)
  83 {
  84         struct winbindd_cli_state *tmp;
  85
  86         DEBUG(0, ("winbindd status:\n"));
  87
  88         /* Print client state information */
  89
  90         DEBUG(0, ("\t%d clients currently active\n", winbindd_num_clients()));
  91
  92         if (DEBUGLEVEL >= 2 && winbindd_num_clients()) {
  93                 DEBUG(2, ("\tclient list:\n"));
  94                 for(tmp = winbindd_client_list(); tmp; tmp = tmp->next) {
  95                         DEBUGADD(2, ("\t\tpid %lu, sock %d\n",
  96                                   (unsigned long)tmp->pid, tmp->sock));
  97                 }
  98         }
  99 }
 100
 101 /* Print winbindd status to log file */
 102
 103 static void print_winbindd_status(void)
 104 {
 105         winbindd_status();
 106 }
 107
 108 /* Flush client cache */
 109
 110 static void flush_caches(void)
 111 {
 112         /* We need to invalidate cached user list entries on a SIGHUP
 113            otherwise cached access denied errors due to restrict anonymous
 114            hang around until the sequence number changes. */
 115
 116         if (!wcache_invalidate_cache()) {
 117                 DEBUG(0, ("invalidating the cache failed; revalidate the cache\n"));
 118                 if (!winbindd_cache_validate_and_initialize()) {
 119                         exit(1);
 120                 }
 121         }
 122 }
 123
 124 static void flush_caches_noinit(void)
 125 {
 126         /*
 127          * We need to invalidate cached user list entries on a SIGHUP
 128          * otherwise cached access denied errors due to restrict anonymous
 129          * hang around until the sequence number changes.
 130          * NB
 131          * Skip uninitialized domains when flush cache.
 132          * If domain is not initialized, it means it is never
 133          * used or never become online. look, wcache_invalidate_cache()
 134          * -> get_cache() -> init_dc_connection(). It causes a lot of traffic
 135          * for unused domains and large traffic for primay domain's DC if there
 136          * are many domains..
 137          */
 138
 139         if (!wcache_invalidate_cache_noinit()) {
 140                 DEBUG(0, ("invalidating the cache failed; revalidate the cache\n"));
 141                 if (!winbindd_cache_validate_and_initialize()) {
 142                         exit(1);
 143                 }
 144         }
 145 }
 146
 147 /* Handle the signal by unlinking socket and exiting */
 148
 149 static void terminate(bool is_parent)
 150 {
 151         if (is_parent) {
 152                 /* When parent goes away we should
 153                  * remove the socket file. Not so
 154                  * when children terminate.
 155                  */
 156                 char *path = NULL;
 157
 158                 if (asprintf(&path, "%s/%s",
 159                         get_winbind_pipe_dir(), WINBINDD_SOCKET_NAME) > 0) {
 160                         unlink(path);
 161                         SAFE_FREE(path);
 162                 }
 163         }
 164
 165         idmap_close();
 166
 167         trustdom_cache_shutdown();
 168
 169         gencache_stabilize();
 170
 171 #if 0
 172         if (interactive) {
 173                 TALLOC_CTX *mem_ctx = talloc_init("end_description");
 174                 char *description = talloc_describe_all(mem_ctx);
 175
 176                 DEBUG(3, ("tallocs left:\n%s\n", description));
 177                 talloc_destroy(mem_ctx);
 178         }
 179 #endif
 180
 181         if (is_parent) {
 182                 serverid_deregister(procid_self());
 183                 pidfile_unlink();
 184         }
 185
 186         exit(0);
 187 }
 188
 189 static void winbindd_sig_term_handler(struct tevent_context *ev,
 190                                       struct tevent_signal *se,
 191                                       int signum,
 192                                       int count,
 193                                       void *siginfo,
 194                                       void *private_data)
 195 {
 196         bool *is_parent = talloc_get_type_abort(private_data, bool);
 197
 198         DEBUG(0,("Got sig[%d] terminate (is_parent=%d)\n",
 199                  signum, (int)*is_parent));
 200         terminate(*is_parent);
 201 }
 202
 203 bool winbindd_setup_sig_term_handler(bool parent)
 204 {
 205         struct tevent_signal *se;
 206         bool *is_parent;
 207
 208         is_parent = talloc(winbind_event_context(), bool);
 209         if (!is_parent) {
 210                 return false;
 211         }
 212
 213         *is_parent = parent;
 214
 215         se = tevent_add_signal(winbind_event_context(),
 216                                is_parent,
 217                                SIGTERM, 0,
 218                                winbindd_sig_term_handler,
 219                                is_parent);
 220         if (!se) {
 221                 DEBUG(0,("failed to setup SIGTERM handler"));
 222                 talloc_free(is_parent);
 223                 return false;
 224         }
 225
 226         se = tevent_add_signal(winbind_event_context(),
 227                                is_parent,
 228                                SIGINT, 0,
 229                                winbindd_sig_term_handler,
 230                                is_parent);
 231         if (!se) {
 232                 DEBUG(0,("failed to setup SIGINT handler"));
 233                 talloc_free(is_parent);
 234                 return false;
 235         }
 236
 237         se = tevent_add_signal(winbind_event_context(),
 238                                is_parent,
 239                                SIGQUIT, 0,
 240                                winbindd_sig_term_handler,
 241                                is_parent);
 242         if (!se) {
 243                 DEBUG(0,("failed to setup SIGINT handler"));
 244                 talloc_free(is_parent);
 245                 return false;
 246         }
 247
 248         return true;
 249 }
 250
 251 static void winbindd_sig_hup_handler(struct tevent_context *ev,
 252                                      struct tevent_signal *se,
 253                                      int signum,
 254                                      int count,
 255                                      void *siginfo,
 256                                      void *private_data)
 257 {
 258         const char *file = (const char *)private_data;
 259
 260         DEBUG(1,("Reloading services after SIGHUP\n"));
 261         flush_caches_noinit();
 262         reload_services_file(file);
 263 }
 264
 265 bool winbindd_setup_sig_hup_handler(const char *lfile)
 266 {
 267         struct tevent_signal *se;
 268         char *file = NULL;
 269
 270         if (lfile) {
 271                 file = talloc_strdup(winbind_event_context(),
 272                                      lfile);
 273                 if (!file) {
 274                         return false;
 275                 }
 276         }
 277
 278         se = tevent_add_signal(winbind_event_context(),
 279                                winbind_event_context(),
 280                                SIGHUP, 0,
 281                                winbindd_sig_hup_handler,
 282                                file);
 283         if (!se) {
 284                 return false;
 285         }
 286
 287         return true;
 288 }
 289
 290 static void winbindd_sig_chld_handler(struct tevent_context *ev,
 291                                       struct tevent_signal *se,
 292                                       int signum,
 293                                       int count,
 294                                       void *siginfo,
 295                                       void *private_data)
 296 {
 297         pid_t pid;
 298
 299         while ((pid = sys_waitpid(-1, NULL, WNOHANG)) > 0) {
 300                 winbind_child_died(pid);
 301         }
 302 }
 303
 304 static bool winbindd_setup_sig_chld_handler(void)
 305 {
 306         struct tevent_signal *se;
 307
 308         se = tevent_add_signal(winbind_event_context(),
 309                                winbind_event_context(),
 310                                SIGCHLD, 0,
 311                                winbindd_sig_chld_handler,
 312                                NULL);
 313         if (!se) {
 314                 return false;
 315         }
 316
 317         return true;
 318 }
 319
 320 static void winbindd_sig_usr2_handler(struct tevent_context *ev,
 321                                       struct tevent_signal *se,
 322                                       int signum,
 323                                       int count,
 324                                       void *siginfo,
 325                                       void *private_data)
 326 {
 327         print_winbindd_status();
 328 }
 329
 330 static bool winbindd_setup_sig_usr2_handler(void)
 331 {
 332         struct tevent_signal *se;
 333
 334         se = tevent_add_signal(winbind_event_context(),
 335                                winbind_event_context(),
 336                                SIGUSR2, 0,
 337                                winbindd_sig_usr2_handler,
 338                                NULL);
 339         if (!se) {
 340                 return false;
 341         }
 342
 343         return true;
 344 }
 345
 346 /* React on 'smbcontrol winbindd reload-config' in the same way as on SIGHUP*/
 347 static void msg_reload_services(struct messaging_context *msg,
 348                                 void *private_data,
 349                                 uint32_t msg_type,
 350                                 struct server_id server_id,
 351                                 DATA_BLOB *data)
 352 {
 353         /* Flush various caches */
 354         flush_caches();
 355         reload_services_file((const char *) private_data);
 356 }
 357
 358 /* React on 'smbcontrol winbindd shutdown' in the same way as on SIGTERM*/
 359 static void msg_shutdown(struct messaging_context *msg,
 360                          void *private_data,
 361                          uint32_t msg_type,
 362                          struct server_id server_id,
 363                          DATA_BLOB *data)
 364 {
 365         /* only the parent waits for this message */
 366         DEBUG(0,("Got shutdown message\n"));
 367         terminate(true);
 368 }
 369
 370
 371 static void winbind_msg_validate_cache(struct messaging_context *msg_ctx,
 372                                        void *private_data,
 373                                        uint32_t msg_type,
 374                                        struct server_id server_id,
 375                                        DATA_BLOB *data)
 376 {
 377         uint8 ret;
 378         pid_t child_pid;
 379
 380         DEBUG(10, ("winbindd_msg_validate_cache: got validate-cache "
 381                    "message.\n"));
 382
 383         /*
 384          * call the validation code from a child:
 385          * so we don't block the main winbindd and the validation
 386          * code can safely use fork/waitpid...
 387          */
 388         child_pid = sys_fork();
 389
 390         if (child_pid == -1) {
 391                 DEBUG(1, ("winbind_msg_validate_cache: Could not fork: %s\n",
 392                           strerror(errno)));
 393                 return;
 394         }
 395
 396         if (child_pid != 0) {
 397                 /* parent */
 398                 DEBUG(5, ("winbind_msg_validate_cache: child created with "
 399                           "pid %d.\n", (int)child_pid));
 400                 return;
 401         }
 402
 403         /* child */
 404
 405         if (!winbindd_reinit_after_fork(NULL)) {
 406                 _exit(0);
 407         }
 408
 409         /* install default SIGCHLD handler: validation code uses fork/waitpid */
 410         CatchSignal(SIGCHLD, SIG_DFL);
 411
 412         ret = (uint8)winbindd_validate_cache_nobackup();
 413         DEBUG(10, ("winbindd_msg_validata_cache: got return value %d\n", ret));
 414         messaging_send_buf(msg_ctx, server_id, MSG_WINBIND_VALIDATE_CACHE, &ret,
 415                            (size_t)1);
 416         _exit(0);
 417 }
 418
 419 static struct winbindd_dispatch_table {
 420         enum winbindd_cmd cmd;
 421         void (*fn)(struct winbindd_cli_state *state);
 422         const char *winbindd_cmd_name;
 423 } dispatch_table[] = {
 424
 425         /* Enumeration functions */
 426
 427         { WINBINDD_LIST_TRUSTDOM, winbindd_list_trusted_domains,
 428           "LIST_TRUSTDOM" },
 429
 430         /* Miscellaneous */
 431
 432         { WINBINDD_INFO, winbindd_info, "INFO" },
 433         { WINBINDD_INTERFACE_VERSION, winbindd_interface_version,
 434           "INTERFACE_VERSION" },
 435         { WINBINDD_DOMAIN_NAME, winbindd_domain_name, "DOMAIN_NAME" },
 436         { WINBINDD_DOMAIN_INFO, winbindd_domain_info, "DOMAIN_INFO" },
 437         { WINBINDD_NETBIOS_NAME, winbindd_netbios_name, "NETBIOS_NAME" },
 438         { WINBINDD_PRIV_PIPE_DIR, winbindd_priv_pipe_dir,
 439           "WINBINDD_PRIV_PIPE_DIR" },
 440
 441         /* Credential cache access */
 442         { WINBINDD_CCACHE_NTLMAUTH, winbindd_ccache_ntlm_auth, "NTLMAUTH" },
 443         { WINBINDD_CCACHE_SAVE, winbindd_ccache_save, "CCACHE_SAVE" },
 444
 445         /* WINS functions */
 446
 447         { WINBINDD_WINS_BYNAME, winbindd_wins_byname, "WINS_BYNAME" },
 448         { WINBINDD_WINS_BYIP, winbindd_wins_byip, "WINS_BYIP" },
 449
 450         /* End of list */
 451
 452         { WINBINDD_NUM_CMDS, NULL, "NONE" }
 453 };
 454
 455 struct winbindd_async_dispatch_table {
 456         enum winbindd_cmd cmd;
 457         const char *cmd_name;
 458         struct tevent_req *(*send_req)(TALLOC_CTX *mem_ctx,
 459                                        struct tevent_context *ev,
 460                                        struct winbindd_cli_state *cli,
 461                                        struct winbindd_request *request);
 462         NTSTATUS (*recv_req)(struct tevent_req *req,
 463                              struct winbindd_response *presp);
 464 };
 465
 466 static struct winbindd_async_dispatch_table async_nonpriv_table[] = {
 467         { WINBINDD_PING, "PING",
 468           wb_ping_send, wb_ping_recv },
 469         { WINBINDD_LOOKUPSID, "LOOKUPSID",
 470           winbindd_lookupsid_send, winbindd_lookupsid_recv },
 471         { WINBINDD_LOOKUPNAME, "LOOKUPNAME",
 472           winbindd_lookupname_send, winbindd_lookupname_recv },
 473         { WINBINDD_SID_TO_UID, "SID_TO_UID",
 474           winbindd_sid_to_uid_send, winbindd_sid_to_uid_recv },
 475         { WINBINDD_SID_TO_GID, "SID_TO_GID",
 476           winbindd_sid_to_gid_send, winbindd_sid_to_gid_recv },
 477         { WINBINDD_UID_TO_SID, "UID_TO_SID",
 478           winbindd_uid_to_sid_send, winbindd_uid_to_sid_recv },
 479         { WINBINDD_GID_TO_SID, "GID_TO_SID",
 480           winbindd_gid_to_sid_send, winbindd_gid_to_sid_recv },
 481         { WINBINDD_GETPWSID, "GETPWSID",
 482           winbindd_getpwsid_send, winbindd_getpwsid_recv },
 483         { WINBINDD_GETPWNAM, "GETPWNAM",
 484           winbindd_getpwnam_send, winbindd_getpwnam_recv },
 485         { WINBINDD_GETPWUID, "GETPWUID",
 486           winbindd_getpwuid_send, winbindd_getpwuid_recv },
 487         { WINBINDD_GETSIDALIASES, "GETSIDALIASES",
 488           winbindd_getsidaliases_send, winbindd_getsidaliases_recv },
 489         { WINBINDD_GETUSERDOMGROUPS, "GETUSERDOMGROUPS",
 490           winbindd_getuserdomgroups_send, winbindd_getuserdomgroups_recv },
 491         { WINBINDD_GETGROUPS, "GETGROUPS",
 492           winbindd_getgroups_send, winbindd_getgroups_recv },
 493         { WINBINDD_SHOW_SEQUENCE, "SHOW_SEQUENCE",
 494           winbindd_show_sequence_send, winbindd_show_sequence_recv },
 495         { WINBINDD_GETGRGID, "GETGRGID",
 496           winbindd_getgrgid_send, winbindd_getgrgid_recv },
 497         { WINBINDD_GETGRNAM, "GETGRNAM",
 498           winbindd_getgrnam_send, winbindd_getgrnam_recv },
 499         { WINBINDD_GETUSERSIDS, "GETUSERSIDS",
 500           winbindd_getusersids_send, winbindd_getusersids_recv },
 501         { WINBINDD_LOOKUPRIDS, "LOOKUPRIDS",
 502           winbindd_lookuprids_send, winbindd_lookuprids_recv },
 503         { WINBINDD_SETPWENT, "SETPWENT",
 504           winbindd_setpwent_send, winbindd_setpwent_recv },
 505         { WINBINDD_GETPWENT, "GETPWENT",
 506           winbindd_getpwent_send, winbindd_getpwent_recv },
 507         { WINBINDD_ENDPWENT, "ENDPWENT",
 508           winbindd_endpwent_send, winbindd_endpwent_recv },
 509         { WINBINDD_DSGETDCNAME, "DSGETDCNAME",
 510           winbindd_dsgetdcname_send, winbindd_dsgetdcname_recv },
 511         { WINBINDD_GETDCNAME, "GETDCNAME",
 512           winbindd_getdcname_send, winbindd_getdcname_recv },
 513         { WINBINDD_SETGRENT, "SETGRENT",
 514           winbindd_setgrent_send, winbindd_setgrent_recv },
 515         { WINBINDD_GETGRENT, "GETGRENT",
 516           winbindd_getgrent_send, winbindd_getgrent_recv },
 517         { WINBINDD_ENDGRENT, "ENDGRENT",
 518           winbindd_endgrent_send, winbindd_endgrent_recv },
 519         { WINBINDD_LIST_USERS, "LIST_USERS",
 520           winbindd_list_users_send, winbindd_list_users_recv },
 521         { WINBINDD_LIST_GROUPS, "LIST_GROUPS",
 522           winbindd_list_groups_send, winbindd_list_groups_recv },
 523         { WINBINDD_CHECK_MACHACC, "CHECK_MACHACC",
 524           winbindd_check_machine_acct_send, winbindd_check_machine_acct_recv },
 525         { WINBINDD_PING_DC, "PING_DC",
 526           winbindd_ping_dc_send, winbindd_ping_dc_recv },
 527         { WINBINDD_PAM_AUTH, "PAM_AUTH",
 528           winbindd_pam_auth_send, winbindd_pam_auth_recv },
 529         { WINBINDD_PAM_LOGOFF, "PAM_LOGOFF",
 530           winbindd_pam_logoff_send, winbindd_pam_logoff_recv },
 531         { WINBINDD_PAM_CHAUTHTOK, "PAM_CHAUTHTOK",
 532           winbindd_pam_chauthtok_send, winbindd_pam_chauthtok_recv },
 533         { WINBINDD_PAM_CHNG_PSWD_AUTH_CRAP, "PAM_CHNG_PSWD_AUTH_CRAP",
 534           winbindd_pam_chng_pswd_auth_crap_send,
 535           winbindd_pam_chng_pswd_auth_crap_recv },
 536
 537         { 0, NULL, NULL, NULL }
 538 };
 539
 540 static struct winbindd_async_dispatch_table async_priv_table[] = {
 541         { WINBINDD_ALLOCATE_UID, "ALLOCATE_UID",
 542           winbindd_allocate_uid_send, winbindd_allocate_uid_recv },
 543         { WINBINDD_ALLOCATE_GID, "ALLOCATE_GID",
 544           winbindd_allocate_gid_send, winbindd_allocate_gid_recv },
 545         { WINBINDD_SET_MAPPING, "SET_MAPPING",
 546           winbindd_set_mapping_send, winbindd_set_mapping_recv },
 547         { WINBINDD_REMOVE_MAPPING, "SET_MAPPING",
 548           winbindd_remove_mapping_send, winbindd_remove_mapping_recv },
 549         { WINBINDD_SET_HWM, "SET_HWM",
 550           winbindd_set_hwm_send, winbindd_set_hwm_recv },
 551         { WINBINDD_CHANGE_MACHACC, "CHANGE_MACHACC",
 552           winbindd_change_machine_acct_send, winbindd_change_machine_acct_recv },
 553         { WINBINDD_PAM_AUTH_CRAP, "PAM_AUTH_CRAP",
 554           winbindd_pam_auth_crap_send, winbindd_pam_auth_crap_recv },
 555
 556         { 0, NULL, NULL, NULL }
 557 };
 558
 559 static void wb_request_done(struct tevent_req *req);
 560
 561 static void process_request(struct winbindd_cli_state *state)
 562 {
 563         struct winbindd_dispatch_table *table = dispatch_table;
 564         struct winbindd_async_dispatch_table *atable;
 565
 566         state->mem_ctx = talloc_named(state, 0, "winbind request");
 567         if (state->mem_ctx == NULL)
 568                 return;
 569
 570         /* Remember who asked us. */
 571         state->pid = state->request->pid;
 572
 573         state->cmd_name = "unknown request";
 574         state->recv_fn = NULL;
 575
 576         /* Process command */
 577
 578         for (atable = async_nonpriv_table; atable->send_req; atable += 1) {
 579                 if (state->request->cmd == atable->cmd) {
 580                         break;
 581                 }
 582         }
 583
 584         if ((atable->send_req == NULL) && state->privileged) {
 585                 for (atable = async_priv_table; atable->send_req;
 586                      atable += 1) {
 587                         if (state->request->cmd == atable->cmd) {
 588                                 break;
 589                         }
 590                 }
 591         }
 592
 593         if (atable->send_req != NULL) {
 594                 struct tevent_req *req;
 595
 596                 state->cmd_name = atable->cmd_name;
 597                 state->recv_fn = atable->recv_req;
 598
 599                 DEBUG(10, ("process_request: Handling async request %d:%s\n",
 600                            (int)state->pid, state->cmd_name));
 601
 602                 req = atable->send_req(state->mem_ctx, winbind_event_context(),
 603                                        state, state->request);
 604                 if (req == NULL) {
 605                         DEBUG(0, ("process_request: atable->send failed for "
 606                                   "%s\n", atable->cmd_name));
 607                         request_error(state);
 608                         return;
 609                 }
 610                 tevent_req_set_callback(req, wb_request_done, state);
 611                 return;
 612         }
 613
 614         state->response = talloc_zero(state->mem_ctx,
 615                                       struct winbindd_response);
 616         if (state->response == NULL) {
 617                 DEBUG(10, ("talloc failed\n"));
 618                 remove_client(state);
 619                 return;
 620         }
 621         state->response->result = WINBINDD_PENDING;
 622         state->response->length = sizeof(struct winbindd_response);
 623
 624         for (table = dispatch_table; table->fn; table++) {
 625                 if (state->request->cmd == table->cmd) {
 626                         DEBUG(10,("process_request: request fn %s\n",
 627                                   table->winbindd_cmd_name ));
 628                         state->cmd_name = table->winbindd_cmd_name;
 629                         table->fn(state);
 630                         break;
 631                 }
 632         }
 633
 634         if (!table->fn) {
 635                 DEBUG(10,("process_request: unknown request fn number %d\n",
 636                           (int)state->request->cmd ));
 637                 request_error(state);
 638         }
 639 }
 640
 641 static void wb_request_done(struct tevent_req *req)
 642 {
 643         struct winbindd_cli_state *state = tevent_req_callback_data(
 644                 req, struct winbindd_cli_state);
 645         NTSTATUS status;
 646
 647         state->response = talloc_zero(state->mem_ctx,
 648                                       struct winbindd_response);
 649         if (state->response == NULL) {
 650                 DEBUG(0, ("wb_request_done[%d:%s]: talloc_zero failed - removing client\n",
 651                           (int)state->pid, state->cmd_name));
 652                 remove_client(state);
 653                 return;
 654         }
 655         state->response->result = WINBINDD_PENDING;
 656         state->response->length = sizeof(struct winbindd_response);
 657
 658         status = state->recv_fn(req, state->response);
 659         TALLOC_FREE(req);
 660
 661         DEBUG(10,("wb_request_done[%d:%s]: %s\n",
 662                   (int)state->pid, state->cmd_name, nt_errstr(status)));
 663
 664         if (!NT_STATUS_IS_OK(status)) {
 665                 request_error(state);
 666                 return;
 667         }
 668         request_ok(state);
 669 }
 670
 671 /*
 672  * This is the main event loop of winbind requests. It goes through a
 673  * state-machine of 3 read/write requests, 4 if you have extra data to send.
 674  *
 675  * An idle winbind client has a read request of 4 bytes outstanding,
 676  * finalizing function is request_len_recv, checking the length. request_recv
 677  * then processes the packet. The processing function then at some point has
 678  * to call request_finished which schedules sending the response.
 679  */
 680
 681 static void request_finished(struct winbindd_cli_state *state);
 682
 683 static void winbind_client_request_read(struct tevent_req *req);
 684 static void winbind_client_response_written(struct tevent_req *req);
 685
 686 static void request_finished(struct winbindd_cli_state *state)
 687 {
 688         struct tevent_req *req;
 689
 690         TALLOC_FREE(state->request);
 691
 692         req = wb_resp_write_send(state, winbind_event_context(),
 693                                  state->out_queue, state->sock,
 694                                  state->response);
 695         if (req == NULL) {
 696                 DEBUG(10,("request_finished[%d:%s]: wb_resp_write_send() failed\n",
 697                           (int)state->pid, state->cmd_name));
 698                 remove_client(state);
 699                 return;
 700         }
 701         tevent_req_set_callback(req, winbind_client_response_written, state);
 702 }
 703
 704 static void winbind_client_response_written(struct tevent_req *req)
 705 {
 706         struct winbindd_cli_state *state = tevent_req_callback_data(
 707                 req, struct winbindd_cli_state);
 708         ssize_t ret;
 709         int err;
 710
 711         ret = wb_resp_write_recv(req, &err);
 712         TALLOC_FREE(req);
 713         if (ret == -1) {
 714                 close(state->sock);
 715                 state->sock = -1;
 716                 DEBUG(2, ("Could not write response[%d:%s] to client: %s\n",
 717                           (int)state->pid, state->cmd_name, strerror(err)));
 718                 remove_client(state);
 719                 return;
 720         }
 721
 722         DEBUG(10,("winbind_client_response_written[%d:%s]: delivered response "
 723                   "to client\n", (int)state->pid, state->cmd_name));
 724
 725         TALLOC_FREE(state->mem_ctx);
 726         state->response = NULL;
 727         state->cmd_name = "no request";
 728         state->recv_fn = NULL;
 729
 730         req = wb_req_read_send(state, winbind_event_context(), state->sock,
 731                                WINBINDD_MAX_EXTRA_DATA);
 732         if (req == NULL) {
 733                 remove_client(state);
 734                 return;
 735         }
 736         tevent_req_set_callback(req, winbind_client_request_read, state);
 737 }
 738
 739 void request_error(struct winbindd_cli_state *state)
 740 {
 741         SMB_ASSERT(state->response->result == WINBINDD_PENDING);
 742         state->response->result = WINBINDD_ERROR;
 743         request_finished(state);
 744 }
 745
 746 void request_ok(struct winbindd_cli_state *state)
 747 {
 748         SMB_ASSERT(state->response->result == WINBINDD_PENDING);
 749         state->response->result = WINBINDD_OK;
 750         request_finished(state);
 751 }
 752
 753 /* Process a new connection by adding it to the client connection list */
 754
 755 static void new_connection(int listen_sock, bool privileged)
 756 {
 757         struct sockaddr_un sunaddr;
 758         struct winbindd_cli_state *state;
 759         struct tevent_req *req;
 760         socklen_t len;
 761         int sock;
 762
 763         /* Accept connection */
 764
 765         len = sizeof(sunaddr);
 766
 767         do {
 768                 sock = accept(listen_sock, (struct sockaddr *)(void *)&sunaddr,
 769                               &len);
 770         } while (sock == -1 && errno == EINTR);
 771
 772         if (sock == -1)
 773                 return;
 774
 775         DEBUG(6,("accepted socket %d\n", sock));
 776
 777         /* Create new connection structure */
 778
 779         if ((state = TALLOC_ZERO_P(NULL, struct winbindd_cli_state)) == NULL) {
 780                 close(sock);
 781                 return;
 782         }
 783
 784         state->sock = sock;
 785
 786         state->out_queue = tevent_queue_create(state, "winbind client reply");
 787         if (state->out_queue == NULL) {
 788                 close(sock);
 789                 TALLOC_FREE(state);
 790                 return;
 791         }
 792
 793         state->last_access = time(NULL);
 794
 795         state->privileged = privileged;
 796
 797         req = wb_req_read_send(state, winbind_event_context(), state->sock,
 798                                WINBINDD_MAX_EXTRA_DATA);
 799         if (req == NULL) {
 800                 TALLOC_FREE(state);
 801                 close(sock);
 802                 return;
 803         }
 804         tevent_req_set_callback(req, winbind_client_request_read, state);
 805
 806         /* Add to connection list */
 807
 808         winbindd_add_client(state);
 809 }
 810
 811 static void winbind_client_request_read(struct tevent_req *req)
 812 {
 813         struct winbindd_cli_state *state = tevent_req_callback_data(
 814                 req, struct winbindd_cli_state);
 815         ssize_t ret;
 816         int err;
 817
 818         ret = wb_req_read_recv(req, state, &state->request, &err);
 819         TALLOC_FREE(req);
 820         if (ret == -1) {
 821                 if (err == EPIPE) {
 822                         DEBUG(6, ("closing socket %d, client exited\n",
 823                                   state->sock));
 824                 } else {
 825                         DEBUG(2, ("Could not read client request from fd %d: "
 826                                   "%s\n", state->sock, strerror(err)));
 827                 }
 828                 close(state->sock);
 829                 state->sock = -1;
 830                 remove_client(state);
 831                 return;
 832         }
 833         process_request(state);
 834 }
 835
 836 /* Remove a client connection from client connection list */
 837
 838 static void remove_client(struct winbindd_cli_state *state)
 839 {
 840         char c = 0;
 841         int nwritten;
 842
 843         /* It's a dead client - hold a funeral */
 844
 845         if (state == NULL) {
 846                 return;
 847         }
 848
 849         if (state->sock != -1) {
 850                 /* tell client, we are closing ... */
 851                 nwritten = write(state->sock, &c, sizeof(c));
 852                 if (nwritten == -1) {
 853                         DEBUG(2, ("final write to client failed: %s\n",
 854                                 strerror(errno)));
 855                 }
 856
 857                 /* Close socket */
 858
 859                 close(state->sock);
 860                 state->sock = -1;
 861         }
 862
 863         TALLOC_FREE(state->mem_ctx);
 864
 865         /* Remove from list and free */
 866
 867         winbindd_remove_client(state);
 868         TALLOC_FREE(state);
 869 }
 870
 871 /* Shutdown client connection which has been idle for the longest time */
 872
 873 static bool remove_idle_client(void)
 874 {
 875         struct winbindd_cli_state *state, *remove_state = NULL;
 876         time_t last_access = 0;
 877         int nidle = 0;
 878
 879         for (state = winbindd_client_list(); state; state = state->next) {
 880                 if (state->response == NULL &&
 881                     !state->pwent_state && !state->grent_state) {
 882                         nidle++;
 883                         if (!last_access || state->last_access < last_access) {
 884                                 last_access = state->last_access;
 885                                 remove_state = state;
 886                         }
 887                 }
 888         }
 889
 890         if (remove_state) {
 891                 DEBUG(5,("Found %d idle client connections, shutting down sock %d, pid %u\n",
 892                         nidle, remove_state->sock, (unsigned int)remove_state->pid));
 893                 remove_client(remove_state);
 894                 return True;
 895         }
 896
 897         return False;
 898 }
 899
 900 struct winbindd_listen_state {
 901         bool privileged;
 902         int fd;
 903 };
 904
 905 static void winbindd_listen_fde_handler(struct tevent_context *ev,
 906                                         struct tevent_fd *fde,
 907                                         uint16_t flags,
 908                                         void *private_data)
 909 {
 910         struct winbindd_listen_state *s = talloc_get_type_abort(private_data,
 911                                           struct winbindd_listen_state);
 912
 913         while (winbindd_num_clients() >
 914                WINBINDD_MAX_SIMULTANEOUS_CLIENTS - 1) {
 915                 DEBUG(5,("winbindd: Exceeding %d client "
 916                          "connections, removing idle "
 917                          "connection.\n",
 918                          WINBINDD_MAX_SIMULTANEOUS_CLIENTS));
 919                 if (!remove_idle_client()) {
 920                         DEBUG(0,("winbindd: Exceeding %d "
 921                                  "client connections, no idle "
 922                                  "connection found\n",
 923                                  WINBINDD_MAX_SIMULTANEOUS_CLIENTS));
 924                         break;
 925                 }
 926         }
 927         new_connection(s->fd, s->privileged);
 928 }
 929
 930 /*
 931  * Winbindd socket accessor functions
 932  */
 933
 934 const char *get_winbind_pipe_dir(void)
 935 {
 936         return lp_parm_const_string(-1, "winbindd", "socket dir", WINBINDD_SOCKET_DIR);
 937 }
 938
 939 char *get_winbind_priv_pipe_dir(void)
 940 {
 941         return lock_path(WINBINDD_PRIV_SOCKET_SUBDIR);
 942 }
 943
 944 static bool winbindd_setup_listeners(void)
 945 {
 946         struct winbindd_listen_state *pub_state = NULL;
 947         struct winbindd_listen_state *priv_state = NULL;
 948         struct tevent_fd *fde;
 949
 950         pub_state = talloc(winbind_event_context(),
 951                            struct winbindd_listen_state);
 952         if (!pub_state) {
 953                 goto failed;
 954         }
 955
 956         pub_state->privileged = false;
 957         pub_state->fd = create_pipe_sock(
 958                 get_winbind_pipe_dir(), WINBINDD_SOCKET_NAME, 0755);
 959         if (pub_state->fd == -1) {
 960                 goto failed;
 961         }
 962
 963         fde = tevent_add_fd(winbind_event_context(), pub_state, pub_state->fd,
 964                             TEVENT_FD_READ, winbindd_listen_fde_handler,
 965                             pub_state);
 966         if (fde == NULL) {
 967                 close(pub_state->fd);
 968                 goto failed;
 969         }
 970         tevent_fd_set_auto_close(fde);
 971
 972         priv_state = talloc(winbind_event_context(),
 973                             struct winbindd_listen_state);
 974         if (!priv_state) {
 975                 goto failed;
 976         }
 977
 978         priv_state->privileged = true;
 979         priv_state->fd = create_pipe_sock(
 980                 get_winbind_priv_pipe_dir(), WINBINDD_SOCKET_NAME, 0750);
 981         if (priv_state->fd == -1) {
 982                 goto failed;
 983         }
 984
 985         fde = tevent_add_fd(winbind_event_context(), priv_state,
 986                             priv_state->fd, TEVENT_FD_READ,
 987                             winbindd_listen_fde_handler, priv_state);
 988         if (fde == NULL) {
 989                 close(priv_state->fd);
 990                 goto failed;
 991         }
 992         tevent_fd_set_auto_close(fde);
 993
 994         return true;
 995 failed:
 996         TALLOC_FREE(pub_state);
 997         TALLOC_FREE(priv_state);
 998         return false;
 999 }
1000
1001 bool winbindd_use_idmap_cache(void)
1002 {
1003         return !opt_nocache;
1004 }
1005
1006 bool winbindd_use_cache(void)
1007 {
1008         return !opt_nocache;
1009 }
1010
1011 void winbindd_register_handlers(void)
1012 {
1013         struct tevent_timer *te;
1014         /* Setup signal handlers */
1015
1016         if (!winbindd_setup_sig_term_handler(true))
1017                 exit(1);
1018         if (!winbindd_setup_sig_hup_handler(NULL))
1019                 exit(1);
1020         if (!winbindd_setup_sig_chld_handler())
1021                 exit(1);
1022         if (!winbindd_setup_sig_usr2_handler())
1023                 exit(1);
1024
1025         CatchSignal(SIGPIPE, SIG_IGN);                 /* Ignore sigpipe */
1026
1027         /*
1028          * Ensure all cache and idmap caches are consistent
1029          * and initialized before we startup.
1030          */
1031         if (!winbindd_cache_validate_and_initialize()) {
1032                 exit(1);
1033         }
1034
1035         /* get broadcast messages */
1036
1037         if (!serverid_register(procid_self(),
1038                                FLAG_MSG_GENERAL|FLAG_MSG_DBWRAP)) {
1039                 DEBUG(1, ("Could not register myself in serverid.tdb\n"));
1040                 exit(1);
1041         }
1042
1043         /* React on 'smbcontrol winbindd reload-config' in the same way
1044            as to SIGHUP signal */
1045         messaging_register(winbind_messaging_context(), NULL,
1046                            MSG_SMB_CONF_UPDATED, msg_reload_services);
1047         messaging_register(winbind_messaging_context(), NULL,
1048                            MSG_SHUTDOWN, msg_shutdown);
1049
1050         /* Handle online/offline messages. */
1051         messaging_register(winbind_messaging_context(), NULL,
1052                            MSG_WINBIND_OFFLINE, winbind_msg_offline);
1053         messaging_register(winbind_messaging_context(), NULL,
1054                            MSG_WINBIND_ONLINE, winbind_msg_online);
1055         messaging_register(winbind_messaging_context(), NULL,
1056                            MSG_WINBIND_ONLINESTATUS, winbind_msg_onlinestatus);
1057
1058         messaging_register(winbind_messaging_context(), NULL,
1059                            MSG_DUMP_EVENT_LIST, winbind_msg_dump_event_list);
1060
1061         messaging_register(winbind_messaging_context(), NULL,
1062                            MSG_WINBIND_VALIDATE_CACHE,
1063                            winbind_msg_validate_cache);
1064
1065         messaging_register(winbind_messaging_context(), NULL,
1066                            MSG_WINBIND_DUMP_DOMAIN_LIST,
1067                            winbind_msg_dump_domain_list);
1068
1069         /* Register handler for MSG_DEBUG. */
1070         messaging_register(winbind_messaging_context(), NULL,
1071                            MSG_DEBUG,
1072                            winbind_msg_debug);
1073
1074         netsamlogon_cache_init(); /* Non-critical */
1075
1076         /* clear the cached list of trusted domains */
1077
1078         wcache_tdc_clear();
1079
1080         if (!init_domain_list()) {
1081                 DEBUG(0,("unable to initialize domain list\n"));
1082                 exit(1);
1083         }
1084
1085         init_idmap_child();
1086         init_locator_child();
1087
1088         smb_nscd_flush_user_cache();
1089         smb_nscd_flush_group_cache();
1090
1091         te = tevent_add_timer(winbind_event_context(), NULL, timeval_zero(),
1092                               rescan_trusted_domains, NULL);
1093         if (te == NULL) {
1094                 DEBUG(0, ("Could not trigger rescan_trusted_domains()\n"));
1095                 exit(1);
1096         }
1097
1098 }
1099
1100 /* Main function */
1101
1102 int main(int argc, char **argv, char **envp)
1103 {
1104         static bool is_daemon = False;
1105         static bool Fork = True;
1106         static bool log_stdout = False;
1107         static bool no_process_group = False;
1108         enum {
1109                 OPT_DAEMON = 1000,
1110                 OPT_FORK,
1111                 OPT_NO_PROCESS_GROUP,
1112                 OPT_LOG_STDOUT
1113         };
1114         struct poptOption long_options[] = {
1115                 POPT_AUTOHELP
1116                 { "stdout", 'S', POPT_ARG_NONE, NULL, OPT_LOG_STDOUT, "Log to stdout" },
1117                 { "foreground", 'F', POPT_ARG_NONE, NULL, OPT_FORK, "Daemon in foreground mode" },
1118                 { "no-process-group", 0, POPT_ARG_NONE, NULL, OPT_NO_PROCESS_GROUP, "Don't create a new process group" },
1119                 { "daemon", 'D', POPT_ARG_NONE, NULL, OPT_DAEMON, "Become a daemon (default)" },
1120                 { "interactive", 'i', POPT_ARG_NONE, NULL, 'i', "Interactive mode" },
1121                 { "no-caching", 'n', POPT_ARG_NONE, NULL, 'n', "Disable caching" },
1122                 POPT_COMMON_SAMBA
1123                 POPT_TABLEEND
1124         };
1125         poptContext pc;
1126         int opt;
1127         TALLOC_CTX *frame = talloc_stackframe();
1128         NTSTATUS status;
1129
1130         /* glibc (?) likes to print "User defined signal 1" and exit if a
1131            SIGUSR[12] is received before a handler is installed */
1132
1133         CatchSignal(SIGUSR1, SIG_IGN);
1134         CatchSignal(SIGUSR2, SIG_IGN);
1135
1136         fault_setup((void (*)(void *))fault_quit );
1137         dump_core_setup("winbindd");
1138
1139         load_case_tables();
1140
1141         /* Initialise for running in non-root mode */
1142
1143         sec_init();
1144
1145         set_remote_machine_name("winbindd", False);
1146
1147         /* Set environment variable so we don't recursively call ourselves.
1148            This may also be useful interactively. */
1149
1150         if ( !winbind_off() ) {
1151                 DEBUG(0,("Failed to disable recusive winbindd calls.  Exiting.\n"));
1152                 exit(1);
1153         }
1154
1155         /* Initialise samba/rpc client stuff */
1156
1157         pc = poptGetContext("winbindd", argc, (const char **)argv, long_options, 0);
1158
1159         while ((opt = poptGetNextOpt(pc)) != -1) {
1160                 switch (opt) {
1161                         /* Don't become a daemon */
1162                 case OPT_DAEMON:
1163                         is_daemon = True;
1164                         break;
1165                 case 'i':
1166                         interactive = True;
1167                         log_stdout = True;
1168                         Fork = False;
1169                         break;
1170                 case OPT_FORK:
1171                         Fork = false;
1172                         break;
1173                 case OPT_NO_PROCESS_GROUP:
1174                         no_process_group = true;
1175                         break;
1176                 case OPT_LOG_STDOUT:
1177                         log_stdout = true;
1178                         break;
1179                 case 'n':
1180                         opt_nocache = true;
1181                         break;
1182                 default:
1183                         d_fprintf(stderr, "\nInvalid option %s: %s\n\n",
1184                                   poptBadOption(pc, 0), poptStrerror(opt));
1185                         poptPrintUsage(pc, stderr, 0);
1186                         exit(1);
1187                 }
1188         }
1189
1190         if (is_daemon && interactive) {
1191                 d_fprintf(stderr,"\nERROR: "
1192                           "Option -i|--interactive is not allowed together with -D|--daemon\n\n");
1193                 poptPrintUsage(pc, stderr, 0);
1194                 exit(1);
1195         }
1196
1197         if (log_stdout && Fork) {
1198                 d_fprintf(stderr, "\nERROR: "
1199                           "Can't log to stdout (-S) unless daemon is in foreground +(-F) or interactive (-i)\n\n");
1200                 poptPrintUsage(pc, stderr, 0);
1201                 exit(1);
1202         }
1203
1204         poptFreeContext(pc);
1205
1206         if (!override_logfile) {
1207                 char *lfile = NULL;
1208                 if (asprintf(&lfile,"%s/log.winbindd",
1209                                 get_dyn_LOGFILEBASE()) > 0) {
1210                         lp_set_logfile(lfile);
1211                         SAFE_FREE(lfile);
1212                 }
1213         }
1214         setup_logging("winbindd", log_stdout);
1215         reopen_logs();
1216
1217         DEBUG(0,("winbindd version %s started.\n", samba_version_string()));
1218         DEBUGADD(0,("%s\n", COPYRIGHT_STARTUP_MESSAGE));
1219
1220         if (!lp_load_initial_only(get_dyn_CONFIGFILE())) {
1221                 DEBUG(0, ("error opening config file\n"));
1222                 exit(1);
1223         }
1224
1225         /* Initialise messaging system */
1226
1227         if (winbind_messaging_context() == NULL) {
1228                 exit(1);
1229         }
1230
1231         if (!reload_services_file(NULL)) {
1232                 DEBUG(0, ("error opening config file\n"));
1233                 exit(1);
1234         }
1235
1236         if (!directory_exist(lp_lockdir())) {
1237                 mkdir(lp_lockdir(), 0755);
1238         }
1239
1240         /* Setup names. */
1241
1242         if (!init_names())
1243                 exit(1);
1244
1245         load_interfaces();
1246
1247         if (!secrets_init()) {
1248
1249                 DEBUG(0,("Could not initialize domain trust account secrets. Giving up\n"));
1250                 return False;
1251         }
1252
1253         /* Unblock all signals we are interested in as they may have been
1254            blocked by the parent process. */
1255
1256         BlockSignals(False, SIGINT);
1257         BlockSignals(False, SIGQUIT);
1258         BlockSignals(False, SIGTERM);
1259         BlockSignals(False, SIGUSR1);
1260         BlockSignals(False, SIGUSR2);
1261         BlockSignals(False, SIGHUP);
1262         BlockSignals(False, SIGCHLD);
1263
1264         if (!interactive)
1265                 become_daemon(Fork, no_process_group, log_stdout);
1266
1267         pidfile_create("winbindd");
1268
1269 #if HAVE_SETPGID
1270         /*
1271          * If we're interactive we want to set our own process group for
1272          * signal management.
1273          */
1274         if (interactive && !no_process_group)
1275                 setpgid( (pid_t)0, (pid_t)0);
1276 #endif
1277
1278         TimeInit();
1279
1280         /* Don't use winbindd_reinit_after_fork here as
1281          * we're just starting up and haven't created any
1282          * winbindd-specific resources we must free yet. JRA.
1283          */
1284
1285         status = reinit_after_fork(winbind_messaging_context(),
1286                                    winbind_event_context(),
1287                                    procid_self(), false);
1288         if (!NT_STATUS_IS_OK(status)) {
1289                 DEBUG(0,("reinit_after_fork() failed\n"));
1290                 exit(1);
1291         }
1292
1293         winbindd_register_handlers();
1294
1295         rpc_lsarpc_init(NULL);
1296         rpc_samr_init(NULL);
1297
1298         if (!init_system_info()) {
1299                 DEBUG(0,("ERROR: failed to setup system user info.\n"));
1300                 exit(1);
1301         }
1302
1303         /* setup listen sockets */
1304
1305         if (!winbindd_setup_listeners()) {
1306                 DEBUG(0,("winbindd_setup_listeners() failed\n"));
1307                 exit(1);
1308         }
1309
1310         TALLOC_FREE(frame);
1311         /* Loop waiting for requests */
1312         while (1) {
1313                 frame = talloc_stackframe();
1314
1315                 if (tevent_loop_once(winbind_event_context()) == -1) {
1316                         DEBUG(1, ("tevent_loop_once() failed: %s\n",
1317                                   strerror(errno)));
1318                         return 1;
1319                 }
1320
1321                 TALLOC_FREE(frame);
1322         }
1323
1324         return 0;
1325 }