source4/smbd/server.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3
   4    Main SMB server routines
   5
   6    Copyright (C) Andrew Tridgell                1992-2005
   7    Copyright (C) Martin Pool                    2002
   8    Copyright (C) Jelmer Vernooij                2002
   9    Copyright (C) James J Myers                  2003 <myersjj@samba.org>
  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 "lib/events/events.h"
  27 #include "version.h"
  28 #include "lib/cmdline/popt_common.h"
  29 #include "system/dir.h"
  30 #include "system/filesys.h"
  31 #include "ntvfs/ntvfs.h"
  32 #include "ntptr/ntptr.h"
  33 #include "auth/gensec/gensec.h"
  34 #include "libcli/auth/schannel.h"
  35 #include "smbd/process_model.h"
  36 #include "param/secrets.h"
  37 #include "lib/util/pidfile.h"
  38 #include "param/param.h"
  39 #include "dsdb/samdb/samdb.h"
  40 #include "auth/session.h"
  41 #include "lib/messaging/irpc.h"
  42 #include "librpc/gen_ndr/ndr_irpc.h"
  43 #include "cluster/cluster.h"
  44 #include "dynconfig/dynconfig.h"
  45 #include "lib/util/samba_modules.h"
  46
  47 /*
  48   recursively delete a directory tree
  49 */
  50 static void recursive_delete(const char *path)
  51 {
  52         DIR *dir;
  53         struct dirent *de;
  54
  55         dir = opendir(path);
  56         if (!dir) {
  57                 return;
  58         }
  59
  60         for (de=readdir(dir);de;de=readdir(dir)) {
  61                 char *fname;
  62                 struct stat st;
  63
  64                 if (ISDOT(de->d_name) || ISDOTDOT(de->d_name)) {
  65                         continue;
  66                 }
  67
  68                 fname = talloc_asprintf(path, "%s/%s", path, de->d_name);
  69                 if (stat(fname, &st) != 0) {
  70                         continue;
  71                 }
  72                 if (S_ISDIR(st.st_mode)) {
  73                         recursive_delete(fname);
  74                         talloc_free(fname);
  75                         continue;
  76                 }
  77                 if (unlink(fname) != 0) {
  78                         DEBUG(0,("Unabled to delete '%s' - %s\n",
  79                                  fname, strerror(errno)));
  80                         smb_panic("unable to cleanup tmp files");
  81                 }
  82                 talloc_free(fname);
  83         }
  84         closedir(dir);
  85 }
  86
  87 /*
  88   cleanup temporary files. This is the new alternative to
  89   TDB_CLEAR_IF_FIRST. Unfortunately TDB_CLEAR_IF_FIRST is not
  90   efficient on unix systems due to the lack of scaling of the byte
  91   range locking system. So instead of putting the burden on tdb to
  92   cleanup tmp files, this function deletes them.
  93 */
  94 static void cleanup_tmp_files(struct loadparm_context *lp_ctx)
  95 {
  96         char *path;
  97         TALLOC_CTX *mem_ctx = talloc_new(NULL);
  98
  99         path = smbd_tmp_path(mem_ctx, lp_ctx, NULL);
 100
 101         recursive_delete(path);
 102         talloc_free(mem_ctx);
 103 }
 104
 105 static void sig_hup(int sig)
 106 {
 107         debug_schedule_reopen_logs();
 108 }
 109
 110 static void sig_term(int sig)
 111 {
 112 #if HAVE_GETPGRP
 113         static int done_sigterm;
 114         if (done_sigterm == 0 && getpgrp() == getpid()) {
 115                 DEBUG(0,("SIGTERM: killing children\n"));
 116                 done_sigterm = 1;
 117                 kill(-getpgrp(), SIGTERM);
 118         }
 119 #endif
 120         DEBUG(0,("Exiting pid %d on SIGTERM\n", (int)getpid()));
 121         exit(127);
 122 }
 123
 124 /*
 125   setup signal masks
 126 */
 127 static void setup_signals(void)
 128 {
 129         /* we are never interested in SIGPIPE */
 130         BlockSignals(true,SIGPIPE);
 131
 132 #if defined(SIGFPE)
 133         /* we are never interested in SIGFPE */
 134         BlockSignals(true,SIGFPE);
 135 #endif
 136
 137         /* We are no longer interested in USR1 */
 138         BlockSignals(true, SIGUSR1);
 139
 140 #if defined(SIGUSR2)
 141         /* We are no longer interested in USR2 */
 142         BlockSignals(true,SIGUSR2);
 143 #endif
 144
 145         /* POSIX demands that signals are inherited. If the invoking process has
 146          * these signals masked, we will have problems, as we won't receive them. */
 147         BlockSignals(false, SIGHUP);
 148         BlockSignals(false, SIGTERM);
 149
 150         CatchSignal(SIGHUP, sig_hup);
 151         CatchSignal(SIGTERM, sig_term);
 152 }
 153
 154 /*
 155   handle io on stdin
 156 */
 157 static void server_stdin_handler(struct tevent_context *event_ctx, struct tevent_fd *fde,
 158                                  uint16_t flags, void *private_data)
 159 {
 160         const char *binary_name = (const char *)private_data;
 161         uint8_t c;
 162         if (read(0, &c, 1) == 0) {
 163                 DEBUG(0,("%s: EOF on stdin - terminating\n", binary_name));
 164 #if HAVE_GETPGRP
 165                 if (getpgrp() == getpid()) {
 166                         DEBUG(0,("Sending SIGTERM from pid %d\n", (int)getpid()));
 167                         kill(-getpgrp(), SIGTERM);
 168                 }
 169 #endif
 170                 exit(0);
 171         }
 172 }
 173
 174 /*
 175   die if the user selected maximum runtime is exceeded
 176 */
 177 _NORETURN_ static void max_runtime_handler(struct tevent_context *ev,
 178                                            struct tevent_timer *te,
 179                                            struct timeval t, void *private_data)
 180 {
 181         const char *binary_name = (const char *)private_data;
 182         DEBUG(0,("%s: maximum runtime exceeded - terminating at %llu, current ts: %llu\n",
 183                  binary_name, (unsigned long long)t.tv_sec, (unsigned long long) time(NULL)));
 184         exit(0);
 185 }
 186
 187 /*
 188   pre-open the key databases. This saves a lot of time in child
 189   processes
 190  */
 191 static void prime_ldb_databases(struct tevent_context *event_ctx)
 192 {
 193         TALLOC_CTX *db_context;
 194         db_context = talloc_new(event_ctx);
 195
 196         samdb_connect(db_context, event_ctx, cmdline_lp_ctx, system_session(cmdline_lp_ctx), 0);
 197         privilege_connect(db_context, cmdline_lp_ctx);
 198
 199         /* we deliberately leave these open, which allows them to be
 200          * re-used in ldb_wrap_connect() */
 201 }
 202
 203
 204 /*
 205   called when a fatal condition occurs in a child task
 206  */
 207 static NTSTATUS samba_terminate(struct irpc_message *msg,
 208                                 struct samba_terminate *r)
 209 {
 210         DEBUG(0,("samba_terminate: %s\n", r->in.reason));
 211         exit(1);
 212 }
 213
 214 /*
 215   setup messaging for the top level samba (parent) task
 216  */
 217 static NTSTATUS setup_parent_messaging(struct tevent_context *event_ctx,
 218                                        struct loadparm_context *lp_ctx)
 219 {
 220         struct imessaging_context *msg;
 221         NTSTATUS status;
 222
 223         msg = imessaging_init(talloc_autofree_context(),
 224                               lp_ctx,
 225                               cluster_id(0, SAMBA_PARENT_TASKID), event_ctx, false);
 226         NT_STATUS_HAVE_NO_MEMORY(msg);
 227
 228         status = irpc_add_name(msg, "samba");
 229         if (!NT_STATUS_IS_OK(status)) {
 230                 return status;
 231         }
 232
 233         status = IRPC_REGISTER(msg, irpc, SAMBA_TERMINATE,
 234                                samba_terminate, NULL);
 235
 236         return status;
 237 }
 238
 239
 240 /*
 241   show build info
 242  */
 243 static void show_build(void)
 244 {
 245 #define CONFIG_OPTION(n) { #n, dyn_ ## n }
 246         struct {
 247                 const char *name;
 248                 const char *value;
 249         } config_options[] = {
 250                 CONFIG_OPTION(BINDIR),
 251                 CONFIG_OPTION(SBINDIR),
 252                 CONFIG_OPTION(CONFIGFILE),
 253                 CONFIG_OPTION(NCALRPCDIR),
 254                 CONFIG_OPTION(LOGFILEBASE),
 255                 CONFIG_OPTION(LMHOSTSFILE),
 256                 CONFIG_OPTION(DATADIR),
 257                 CONFIG_OPTION(MODULESDIR),
 258                 CONFIG_OPTION(LOCKDIR),
 259                 CONFIG_OPTION(STATEDIR),
 260                 CONFIG_OPTION(CACHEDIR),
 261                 CONFIG_OPTION(PIDDIR),
 262                 CONFIG_OPTION(PRIVATE_DIR),
 263                 CONFIG_OPTION(CODEPAGEDIR),
 264                 CONFIG_OPTION(SETUPDIR),
 265                 CONFIG_OPTION(WINBINDD_SOCKET_DIR),
 266                 CONFIG_OPTION(WINBINDD_PRIVILEGED_SOCKET_DIR),
 267                 CONFIG_OPTION(NTP_SIGND_SOCKET_DIR),
 268                 { NULL, NULL}
 269         };
 270         int i;
 271
 272         printf("Samba version: %s\n", SAMBA_VERSION_STRING);
 273         printf("Build environment:\n");
 274 #ifdef BUILD_SYSTEM
 275         printf("   Build host:  %s\n", BUILD_SYSTEM);
 276 #endif
 277
 278         printf("Paths:\n");
 279         for (i=0; config_options[i].name; i++) {
 280                 printf("   %s: %s\n", config_options[i].name, config_options[i].value);
 281         }
 282
 283         exit(0);
 284 }
 285
 286 /*
 287  main server.
 288 */
 289 static int binary_smbd_main(const char *binary_name, int argc, const char *argv[])
 290 {
 291         bool opt_daemon = false;
 292         bool opt_interactive = false;
 293         int opt;
 294         poptContext pc;
 295 #define _MODULE_PROTO(init) extern NTSTATUS init(void);
 296         STATIC_service_MODULES_PROTO;
 297         init_module_fn static_init[] = { STATIC_service_MODULES };
 298         init_module_fn *shared_init;
 299         struct tevent_context *event_ctx;
 300         uint16_t stdin_event_flags;
 301         NTSTATUS status;
 302         const char *model = "standard";
 303         int max_runtime = 0;
 304         enum {
 305                 OPT_DAEMON = 1000,
 306                 OPT_INTERACTIVE,
 307                 OPT_PROCESS_MODEL,
 308                 OPT_SHOW_BUILD
 309         };
 310         struct poptOption long_options[] = {
 311                 POPT_AUTOHELP
 312                 {"daemon", 'D', POPT_ARG_NONE, NULL, OPT_DAEMON,
 313                  "Become a daemon (default)", NULL },
 314                 {"interactive", 'i', POPT_ARG_NONE, NULL, OPT_INTERACTIVE,
 315                  "Run interactive (not a daemon)", NULL},
 316                 {"model", 'M', POPT_ARG_STRING, NULL, OPT_PROCESS_MODEL,
 317                  "Select process model", "MODEL"},
 318                 {"maximum-runtime",0, POPT_ARG_INT, &max_runtime, 0,
 319                  "set maximum runtime of the server process, till autotermination", "seconds"},
 320                 {"show-build", 'b', POPT_ARG_NONE, NULL, OPT_SHOW_BUILD, "show build info", NULL },
 321                 POPT_COMMON_SAMBA
 322                 POPT_COMMON_VERSION
 323                 { NULL }
 324         };
 325
 326         pc = poptGetContext(binary_name, argc, argv, long_options, 0);
 327         while((opt = poptGetNextOpt(pc)) != -1) {
 328                 switch(opt) {
 329                 case OPT_DAEMON:
 330                         opt_daemon = true;
 331                         break;
 332                 case OPT_INTERACTIVE:
 333                         opt_interactive = true;
 334                         break;
 335                 case OPT_PROCESS_MODEL:
 336                         model = poptGetOptArg(pc);
 337                         break;
 338                 case OPT_SHOW_BUILD:
 339                         show_build();
 340                         break;
 341                 default:
 342                         fprintf(stderr, "\nInvalid option %s: %s\n\n",
 343                                   poptBadOption(pc, 0), poptStrerror(opt));
 344                         poptPrintUsage(pc, stderr, 0);
 345                         return 1;
 346                 }
 347         }
 348
 349         if (opt_daemon && opt_interactive) {
 350                 fprintf(stderr,"\nERROR: "
 351                           "Option -i|--interactive is not allowed together with -D|--daemon\n\n");
 352                 poptPrintUsage(pc, stderr, 0);
 353                 return 1;
 354         } else if (!opt_interactive) {
 355                 /* default is --daemon */
 356                 opt_daemon = true;
 357         }
 358
 359         poptFreeContext(pc);
 360
 361         setup_logging(binary_name, opt_interactive?DEBUG_STDOUT:DEBUG_FILE);
 362         setup_signals();
 363
 364         /* we want total control over the permissions on created files,
 365            so set our umask to 0 */
 366         umask(0);
 367
 368         DEBUG(0,("%s version %s started.\n", binary_name, SAMBA_VERSION_STRING));
 369         DEBUGADD(0,("Copyright Andrew Tridgell and the Samba Team 1992-2013\n"));
 370
 371         if (sizeof(uint16_t) < 2 || sizeof(uint32_t) < 4 || sizeof(uint64_t) < 8) {
 372                 DEBUG(0,("ERROR: Samba is not configured correctly for the word size on your machine\n"));
 373                 DEBUGADD(0,("sizeof(uint16_t) = %u, sizeof(uint32_t) %u, sizeof(uint64_t) = %u\n",
 374                             (unsigned int)sizeof(uint16_t), (unsigned int)sizeof(uint32_t), (unsigned int)sizeof(uint64_t)));
 375                 return 1;
 376         }
 377
 378         if (opt_daemon) {
 379                 DEBUG(3,("Becoming a daemon.\n"));
 380                 become_daemon(true, false, false);
 381         }
 382
 383         cleanup_tmp_files(cmdline_lp_ctx);
 384
 385         if (!directory_exist(lpcfg_lockdir(cmdline_lp_ctx))) {
 386                 mkdir(lpcfg_lockdir(cmdline_lp_ctx), 0755);
 387         }
 388
 389         pidfile_create(lpcfg_piddir(cmdline_lp_ctx), binary_name);
 390
 391         /* Set up a database to hold a random seed, in case we don't
 392          * have /dev/urandom */
 393         if (!randseed_init(talloc_autofree_context(), cmdline_lp_ctx)) {
 394                 return 1;
 395         }
 396
 397         if (lpcfg_server_role(cmdline_lp_ctx) == ROLE_ACTIVE_DIRECTORY_DC) {
 398                 if (!open_schannel_session_store(talloc_autofree_context(), cmdline_lp_ctx)) {
 399                         DEBUG(0,("ERROR: Samba cannot open schannel store for secured NETLOGON operations.\n"));
 400                         exit(1);
 401                 }
 402         }
 403
 404         gensec_init(); /* FIXME: */
 405
 406         ntptr_init();   /* FIXME: maybe run this in the initialization function
 407                                                 of the spoolss RPC server instead? */
 408
 409         ntvfs_init(cmdline_lp_ctx);     /* FIXME: maybe run this in the initialization functions
 410                                                 of the SMB[,2] server instead? */
 411
 412         process_model_init(cmdline_lp_ctx);
 413
 414         shared_init = load_samba_modules(NULL, "service");
 415
 416         run_init_functions(static_init);
 417         run_init_functions(shared_init);
 418
 419         talloc_free(shared_init);
 420
 421         /* the event context is the top level structure in smbd. Everything else
 422            should hang off that */
 423         event_ctx = s4_event_context_init(talloc_autofree_context());
 424
 425         if (event_ctx == NULL) {
 426                 DEBUG(0,("Initializing event context failed\n"));
 427                 return 1;
 428         }
 429
 430         if (opt_interactive) {
 431                 /* terminate when stdin goes away */
 432                 stdin_event_flags = TEVENT_FD_READ;
 433         } else {
 434                 /* stay alive forever */
 435                 stdin_event_flags = 0;
 436         }
 437
 438         /* catch EOF on stdin */
 439 #ifdef SIGTTIN
 440         signal(SIGTTIN, SIG_IGN);
 441 #endif
 442         tevent_add_fd(event_ctx, event_ctx, 0, stdin_event_flags,
 443                       server_stdin_handler,
 444                       discard_const(binary_name));
 445
 446         if (max_runtime) {
 447                 DEBUG(0,("Called with maxruntime %d - current ts %llu\n",
 448                       max_runtime, (unsigned long long) time(NULL)));
 449                 tevent_add_timer(event_ctx, event_ctx,
 450                                  timeval_current_ofs(max_runtime, 0),
 451                                  max_runtime_handler,
 452                                  discard_const(binary_name));
 453         }
 454
 455         if (lpcfg_server_role(cmdline_lp_ctx) != ROLE_ACTIVE_DIRECTORY_DC
 456             && !lpcfg_parm_bool(cmdline_lp_ctx, NULL, "server role check", "inhibit", false)
 457             && !str_list_check_ci(lpcfg_server_services(cmdline_lp_ctx), "smb")
 458             && !str_list_check_ci(lpcfg_dcerpc_endpoint_servers(cmdline_lp_ctx), "remote")
 459             && !str_list_check_ci(lpcfg_dcerpc_endpoint_servers(cmdline_lp_ctx), "mapiproxy")) {
 460                 DEBUG(0, ("At this time the 'samba' binary should only be used for either:\n"));
 461                 DEBUGADD(0, ("'server role = active directory domain controller' or to access the ntvfs file server with 'server services = +smb' or the rpc proxy with 'dcerpc endpoint servers = remote'\n"));
 462                 DEBUGADD(0, ("You should start smbd/nmbd/winbindd instead for domain member and standalone file server tasks\n"));
 463                 exit(1);
 464         };
 465
 466         prime_ldb_databases(event_ctx);
 467
 468         status = setup_parent_messaging(event_ctx, cmdline_lp_ctx);
 469         if (!NT_STATUS_IS_OK(status)) {
 470                 DEBUG(0,("Failed to setup parent messaging - %s\n", nt_errstr(status)));
 471                 return 1;
 472         }
 473
 474         DEBUG(0,("%s: using '%s' process model\n", binary_name, model));
 475
 476         status = server_service_startup(event_ctx, cmdline_lp_ctx, model,
 477                                         lpcfg_server_services(cmdline_lp_ctx));
 478         if (!NT_STATUS_IS_OK(status)) {
 479                 DEBUG(0,("Starting Services failed - %s\n", nt_errstr(status)));
 480                 return 1;
 481         }
 482
 483         /* wait for events - this is where smbd sits for most of its
 484            life */
 485         tevent_loop_wait(event_ctx);
 486
 487         /* as everything hangs off this event context, freeing it
 488            should initiate a clean shutdown of all services */
 489         talloc_free(event_ctx);
 490
 491         return 0;
 492 }
 493
 494 int main(int argc, const char *argv[])
 495 {
 496         return binary_smbd_main("samba", argc, argv);
 497 }