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_STRUCT(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
 713         state->out_queue = tevent_queue_create(state, "winbind client reply");
 714         if (state->out_queue == NULL) {
 715                 close(sock);
 716                 TALLOC_FREE(state);
 717                 return;
 718         }
 719
 720         state->last_access = time(NULL);
 721
 722         state->privileged = privileged;
 723
 724         req = wb_req_read_send(state, winbind_event_context(), state->sock,
 725                                WINBINDD_MAX_EXTRA_DATA);
 726         if (req == NULL) {
 727                 TALLOC_FREE(state);
 728                 close(sock);
 729                 return;
 730         }
 731         tevent_req_set_callback(req, winbind_client_request_read, state);
 732
 733         /* Add to connection list */
 734
 735         winbindd_add_client(state);
 736 }
 737
 738 static void winbind_client_request_read(struct tevent_req *req)
 739 {
 740         struct winbindd_cli_state *state = tevent_req_callback_data(
 741                 req, struct winbindd_cli_state);
 742         ssize_t ret;
 743         int err;
 744
 745         ret = wb_req_read_recv(req, state, &state->request, &err);
 746         if (ret == -1) {
 747                 DEBUG(2, ("Could not read client request: %s\n",
 748                           strerror(err)));
 749                 remove_client(state);
 750                 return;
 751         }
 752         process_request(state);
 753 }
 754
 755 /* Remove a client connection from client connection list */
 756
 757 static void remove_client(struct winbindd_cli_state *state)
 758 {
 759         char c = 0;
 760         int nwritten;
 761
 762         /* It's a dead client - hold a funeral */
 763
 764         if (state == NULL) {
 765                 return;
 766         }
 767
 768         /* tell client, we are closing ... */
 769         nwritten = write(state->sock, &c, sizeof(c));
 770         if (nwritten == -1) {
 771                 /*
 772                  * ignore EPIPE error here, because the other end might
 773                  * have already closed the socket.
 774                  */
 775                 if (errno != EPIPE) {
 776                         DEBUG(2, ("final write to client failed: %s\n",
 777                                 strerror(errno)));
 778                 }
 779         }
 780
 781         /* Close socket */
 782
 783         close(state->sock);
 784
 785         /* Free any getent state */
 786
 787         free_getent_state(state->getpwent_state);
 788         free_getent_state(state->getgrent_state);
 789
 790         TALLOC_FREE(state->mem_ctx);
 791
 792         /* Remove from list and free */
 793
 794         winbindd_remove_client(state);
 795         TALLOC_FREE(state);
 796 }
 797
 798 /* Shutdown client connection which has been idle for the longest time */
 799
 800 static bool remove_idle_client(void)
 801 {
 802         struct winbindd_cli_state *state, *remove_state = NULL;
 803         time_t last_access = 0;
 804         int nidle = 0;
 805
 806         for (state = winbindd_client_list(); state; state = state->next) {
 807                 if (state->response.result != WINBINDD_PENDING &&
 808                     !state->getpwent_state && !state->getgrent_state) {
 809                         nidle++;
 810                         if (!last_access || state->last_access < last_access) {
 811                                 last_access = state->last_access;
 812                                 remove_state = state;
 813                         }
 814                 }
 815         }
 816
 817         if (remove_state) {
 818                 DEBUG(5,("Found %d idle client connections, shutting down sock %d, pid %u\n",
 819                         nidle, remove_state->sock, (unsigned int)remove_state->pid));
 820                 remove_client(remove_state);
 821                 return True;
 822         }
 823
 824         return False;
 825 }
 826
 827 struct winbindd_listen_state {
 828         bool privileged;
 829         int fd;
 830 };
 831
 832 static void winbindd_listen_fde_handler(struct tevent_context *ev,
 833                                         struct tevent_fd *fde,
 834                                         uint16_t flags,
 835                                         void *private_data)
 836 {
 837         struct winbindd_listen_state *s = talloc_get_type_abort(private_data,
 838                                           struct winbindd_listen_state);
 839
 840         while (winbindd_num_clients() >
 841                WINBINDD_MAX_SIMULTANEOUS_CLIENTS - 1) {
 842                 DEBUG(5,("winbindd: Exceeding %d client "
 843                          "connections, removing idle "
 844                          "connection.\n",
 845                          WINBINDD_MAX_SIMULTANEOUS_CLIENTS));
 846                 if (!remove_idle_client()) {
 847                         DEBUG(0,("winbindd: Exceeding %d "
 848                                  "client connections, no idle "
 849                                  "connection found\n",
 850                                  WINBINDD_MAX_SIMULTANEOUS_CLIENTS));
 851                         break;
 852                 }
 853         }
 854         new_connection(s->fd, s->privileged);
 855 }
 856
 857 static bool winbindd_setup_listeners(void)
 858 {
 859         struct winbindd_listen_state *pub_state = NULL;
 860         struct winbindd_listen_state *priv_state = NULL;
 861         struct tevent_fd *fde;
 862
 863         pub_state = talloc(winbind_event_context(),
 864                            struct winbindd_listen_state);
 865         if (!pub_state) {
 866                 goto failed;
 867         }
 868
 869         pub_state->privileged = false;
 870         pub_state->fd = open_winbindd_socket();
 871         if (pub_state->fd == -1) {
 872                 goto failed;
 873         }
 874
 875         fde = tevent_add_fd(winbind_event_context(), pub_state, pub_state->fd,
 876                             TEVENT_FD_READ, winbindd_listen_fde_handler,
 877                             pub_state);
 878         if (fde == NULL) {
 879                 close(pub_state->fd);
 880                 goto failed;
 881         }
 882         tevent_fd_set_auto_close(fde);
 883
 884         priv_state = talloc(winbind_event_context(),
 885                             struct winbindd_listen_state);
 886         if (!priv_state) {
 887                 goto failed;
 888         }
 889
 890         priv_state->privileged = true;
 891         priv_state->fd = open_winbindd_priv_socket();
 892         if (priv_state->fd == -1) {
 893                 goto failed;
 894         }
 895
 896         fde = tevent_add_fd(winbind_event_context(), priv_state,
 897                             priv_state->fd, TEVENT_FD_READ,
 898                             winbindd_listen_fde_handler, priv_state);
 899         if (fde == NULL) {
 900                 close(priv_state->fd);
 901                 goto failed;
 902         }
 903         tevent_fd_set_auto_close(fde);
 904
 905         return true;
 906 failed:
 907         TALLOC_FREE(pub_state);
 908         TALLOC_FREE(priv_state);
 909         return false;
 910 }
 911
 912 /* Process incoming clients on listen_sock.  We use a tricky non-blocking,
 913    non-forking, non-threaded model which allows us to handle many
 914    simultaneous connections while remaining impervious to many denial of
 915    service attacks. */
 916
 917 static void process_loop(void)
 918 {
 919         fd_set r_fds, w_fds;
 920         int maxfd = 0, selret;
 921         struct timeval timeout, ev_timeout;
 922
 923         run_events(winbind_event_context(), 0, NULL, NULL);
 924
 925         /* Initialise fd lists for select() */
 926
 927         FD_ZERO(&r_fds);
 928         FD_ZERO(&w_fds);
 929
 930         timeout.tv_sec = WINBINDD_ESTABLISH_LOOP;
 931         timeout.tv_usec = 0;
 932
 933         /* Check for any event timeouts. */
 934         {
 935                 struct timeval now;
 936                 GetTimeOfDay(&now);
 937
 938                 event_add_to_select_args(winbind_event_context(), &now,
 939                                          &r_fds, &w_fds, &ev_timeout, &maxfd);
 940         }
 941         if (get_timed_events_timeout(winbind_event_context(), &ev_timeout)) {
 942                 timeout = timeval_min(&timeout, &ev_timeout);
 943         }
 944
 945         /* Call select */
 946
 947         selret = sys_select(maxfd + 1, &r_fds, &w_fds, NULL, &timeout);
 948
 949         if (selret == 0) {
 950                 goto no_fds_ready;
 951         }
 952
 953         if (selret == -1) {
 954                 if (errno == EINTR) {
 955                         goto no_fds_ready;
 956                 }
 957
 958                 /* Select error, something is badly wrong */
 959
 960                 perror("select");
 961                 exit(1);
 962         }
 963
 964         /* selret > 0 */
 965
 966         run_events(winbind_event_context(), selret, &r_fds, &w_fds);
 967
 968         return;
 969
 970  no_fds_ready:
 971
 972         run_events(winbind_event_context(), selret, &r_fds, &w_fds);
 973
 974 #if 0
 975         winbindd_check_cache_size(time(NULL));
 976 #endif
 977 }
 978
 979 bool winbindd_use_idmap_cache(void)
 980 {
 981         return !opt_nocache;
 982 }
 983
 984 bool winbindd_use_cache(void)
 985 {
 986         return !opt_nocache;
 987 }
 988
 989 /* Main function */
 990
 991 int main(int argc, char **argv, char **envp)
 992 {
 993         static bool is_daemon = False;
 994         static bool Fork = True;
 995         static bool log_stdout = False;
 996         static bool no_process_group = False;
 997         enum {
 998                 OPT_DAEMON = 1000,
 999                 OPT_FORK,
1000                 OPT_NO_PROCESS_GROUP,
1001                 OPT_LOG_STDOUT
1002         };
1003         struct poptOption long_options[] = {
1004                 POPT_AUTOHELP
1005                 { "stdout", 'S', POPT_ARG_NONE, NULL, OPT_LOG_STDOUT, "Log to stdout" },
1006                 { "foreground", 'F', POPT_ARG_NONE, NULL, OPT_FORK, "Daemon in foreground mode" },
1007                 { "no-process-group", 0, POPT_ARG_NONE, NULL, OPT_NO_PROCESS_GROUP, "Don't create a new process group" },
1008                 { "daemon", 'D', POPT_ARG_NONE, NULL, OPT_DAEMON, "Become a daemon (default)" },
1009                 { "interactive", 'i', POPT_ARG_NONE, NULL, 'i', "Interactive mode" },
1010                 { "no-caching", 'n', POPT_ARG_NONE, NULL, 'n', "Disable caching" },
1011                 POPT_COMMON_SAMBA
1012                 POPT_TABLEEND
1013         };
1014         poptContext pc;
1015         int opt;
1016         TALLOC_CTX *frame = talloc_stackframe();
1017
1018         /* glibc (?) likes to print "User defined signal 1" and exit if a
1019            SIGUSR[12] is received before a handler is installed */
1020
1021         CatchSignal(SIGUSR1, SIG_IGN);
1022         CatchSignal(SIGUSR2, SIG_IGN);
1023
1024         fault_setup((void (*)(void *))fault_quit );
1025         dump_core_setup("winbindd");
1026
1027         load_case_tables();
1028
1029         /* Initialise for running in non-root mode */
1030
1031         sec_init();
1032
1033         set_remote_machine_name("winbindd", False);
1034
1035         /* Set environment variable so we don't recursively call ourselves.
1036            This may also be useful interactively. */
1037
1038         if ( !winbind_off() ) {
1039                 DEBUG(0,("Failed to disable recusive winbindd calls.  Exiting.\n"));
1040                 exit(1);
1041         }
1042
1043         /* Initialise samba/rpc client stuff */
1044
1045         pc = poptGetContext("winbindd", argc, (const char **)argv, long_options, 0);
1046
1047         while ((opt = poptGetNextOpt(pc)) != -1) {
1048                 switch (opt) {
1049                         /* Don't become a daemon */
1050                 case OPT_DAEMON:
1051                         is_daemon = True;
1052                         break;
1053                 case 'i':
1054                         interactive = True;
1055                         log_stdout = True;
1056                         Fork = False;
1057                         break;
1058                 case OPT_FORK:
1059                         Fork = false;
1060                         break;
1061                 case OPT_NO_PROCESS_GROUP:
1062                         no_process_group = true;
1063                         break;
1064                 case OPT_LOG_STDOUT:
1065                         log_stdout = true;
1066                         break;
1067                 case 'n':
1068                         opt_nocache = true;
1069                         break;
1070                 default:
1071                         d_fprintf(stderr, "\nInvalid option %s: %s\n\n",
1072                                   poptBadOption(pc, 0), poptStrerror(opt));
1073                         poptPrintUsage(pc, stderr, 0);
1074                         exit(1);
1075                 }
1076         }
1077
1078         if (is_daemon && interactive) {
1079                 d_fprintf(stderr,"\nERROR: "
1080                           "Option -i|--interactive is not allowed together with -D|--daemon\n\n");
1081                 poptPrintUsage(pc, stderr, 0);
1082                 exit(1);
1083         }
1084
1085         if (log_stdout && Fork) {
1086                 d_fprintf(stderr, "\nERROR: "
1087                           "Can't log to stdout (-S) unless daemon is in foreground +(-F) or interactive (-i)\n\n");
1088                 poptPrintUsage(pc, stderr, 0);
1089                 exit(1);
1090         }
1091
1092         poptFreeContext(pc);
1093
1094         if (!override_logfile) {
1095                 char *lfile = NULL;
1096                 if (asprintf(&lfile,"%s/log.winbindd",
1097                                 get_dyn_LOGFILEBASE()) > 0) {
1098                         lp_set_logfile(lfile);
1099                         SAFE_FREE(lfile);
1100                 }
1101         }
1102         setup_logging("winbindd", log_stdout);
1103         reopen_logs();
1104
1105         DEBUG(0,("winbindd version %s started.\n", samba_version_string()));
1106         DEBUGADD(0,("%s\n", COPYRIGHT_STARTUP_MESSAGE));
1107
1108         if (!lp_load_initial_only(get_dyn_CONFIGFILE())) {
1109                 DEBUG(0, ("error opening config file\n"));
1110                 exit(1);
1111         }
1112
1113         /* Initialise messaging system */
1114
1115         if (winbind_messaging_context() == NULL) {
1116                 exit(1);
1117         }
1118
1119         if (!reload_services_file(NULL)) {
1120                 DEBUG(0, ("error opening config file\n"));
1121                 exit(1);
1122         }
1123
1124         if (!directory_exist(lp_lockdir())) {
1125                 mkdir(lp_lockdir(), 0755);
1126         }
1127
1128         /* Setup names. */
1129
1130         if (!init_names())
1131                 exit(1);
1132
1133         load_interfaces();
1134
1135         if (!secrets_init()) {
1136
1137                 DEBUG(0,("Could not initialize domain trust account secrets. Giving up\n"));
1138                 return False;
1139         }
1140
1141         /* Enable netbios namecache */
1142
1143         namecache_enable();
1144
1145         /* Unblock all signals we are interested in as they may have been
1146            blocked by the parent process. */
1147
1148         BlockSignals(False, SIGINT);
1149         BlockSignals(False, SIGQUIT);
1150         BlockSignals(False, SIGTERM);
1151         BlockSignals(False, SIGUSR1);
1152         BlockSignals(False, SIGUSR2);
1153         BlockSignals(False, SIGHUP);
1154         BlockSignals(False, SIGCHLD);
1155
1156         if (!interactive)
1157                 become_daemon(Fork, no_process_group);
1158
1159         pidfile_create("winbindd");
1160
1161 #if HAVE_SETPGID
1162         /*
1163          * If we're interactive we want to set our own process group for
1164          * signal management.
1165          */
1166         if (interactive && !no_process_group)
1167                 setpgid( (pid_t)0, (pid_t)0);
1168 #endif
1169
1170         TimeInit();
1171
1172         /* Don't use winbindd_reinit_after_fork here as
1173          * we're just starting up and haven't created any
1174          * winbindd-specific resources we must free yet. JRA.
1175          */
1176
1177         if (!NT_STATUS_IS_OK(reinit_after_fork(winbind_messaging_context(),
1178                                                winbind_event_context(),
1179                                                false))) {
1180                 DEBUG(0,("reinit_after_fork() failed\n"));
1181                 exit(1);
1182         }
1183
1184         /* Setup signal handlers */
1185
1186         if (!winbindd_setup_sig_term_handler(true))
1187                 exit(1);
1188         if (!winbindd_setup_sig_hup_handler(NULL))
1189                 exit(1);
1190         if (!winbindd_setup_sig_chld_handler())
1191                 exit(1);
1192         if (!winbindd_setup_sig_usr2_handler())
1193                 exit(1);
1194
1195         CatchSignal(SIGPIPE, SIG_IGN);                 /* Ignore sigpipe */
1196
1197         /*
1198          * Ensure all cache and idmap caches are consistent
1199          * and initialized before we startup.
1200          */
1201         if (!winbindd_cache_validate_and_initialize()) {
1202                 exit(1);
1203         }
1204
1205         /* get broadcast messages */
1206         claim_connection(NULL,"",FLAG_MSG_GENERAL|FLAG_MSG_DBWRAP);
1207
1208         /* React on 'smbcontrol winbindd reload-config' in the same way
1209            as to SIGHUP signal */
1210         messaging_register(winbind_messaging_context(), NULL,
1211                            MSG_SMB_CONF_UPDATED, msg_reload_services);
1212         messaging_register(winbind_messaging_context(), NULL,
1213                            MSG_SHUTDOWN, msg_shutdown);
1214
1215         /* Handle online/offline messages. */
1216         messaging_register(winbind_messaging_context(), NULL,
1217                            MSG_WINBIND_OFFLINE, winbind_msg_offline);
1218         messaging_register(winbind_messaging_context(), NULL,
1219                            MSG_WINBIND_ONLINE, winbind_msg_online);
1220         messaging_register(winbind_messaging_context(), NULL,
1221                            MSG_WINBIND_ONLINESTATUS, winbind_msg_onlinestatus);
1222
1223         messaging_register(winbind_messaging_context(), NULL,
1224                            MSG_DUMP_EVENT_LIST, winbind_msg_dump_event_list);
1225
1226         messaging_register(winbind_messaging_context(), NULL,
1227                            MSG_WINBIND_VALIDATE_CACHE,
1228                            winbind_msg_validate_cache);
1229
1230         messaging_register(winbind_messaging_context(), NULL,
1231                            MSG_WINBIND_DUMP_DOMAIN_LIST,
1232                            winbind_msg_dump_domain_list);
1233
1234         /* Register handler for MSG_DEBUG. */
1235         messaging_register(winbind_messaging_context(), NULL,
1236                            MSG_DEBUG,
1237                            winbind_msg_debug);
1238
1239         netsamlogon_cache_init(); /* Non-critical */
1240
1241         /* clear the cached list of trusted domains */
1242
1243         wcache_tdc_clear();
1244
1245         if (!init_domain_list()) {
1246                 DEBUG(0,("unable to initialize domain list\n"));
1247                 exit(1);
1248         }
1249
1250         init_idmap_child();
1251         init_locator_child();
1252
1253         smb_nscd_flush_user_cache();
1254         smb_nscd_flush_group_cache();
1255
1256         /* setup listen sockets */
1257
1258         if (!winbindd_setup_listeners()) {
1259                 DEBUG(0,("winbindd_setup_listeners() failed\n"));
1260                 exit(1);
1261         }
1262
1263         TALLOC_FREE(frame);
1264         /* Loop waiting for requests */
1265         while (1) {
1266                 frame = talloc_stackframe();
1267
1268                 /* refresh the trusted domain cache */
1269
1270                 rescan_trusted_domains();
1271
1272                 process_loop();
1273
1274                 TALLOC_FREE(frame);
1275         }
1276
1277         return 0;
1278 }