source3/winbindd/winbindd.c

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