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(SWATDIR),
 264                 CONFIG_OPTION(CODEPAGEDIR),
 265                 CONFIG_OPTION(SETUPDIR),
 266                 CONFIG_OPTION(WINBINDD_SOCKET_DIR),
 267                 CONFIG_OPTION(WINBINDD_PRIVILEGED_SOCKET_DIR),
 268                 CONFIG_OPTION(NTP_SIGND_SOCKET_DIR),
 269                 { NULL, NULL}
 270         };
 271         int i;
 272
 273         printf("Samba version: %s\n", SAMBA_VERSION_STRING);
 274         printf("Build environment:\n");
 275 #ifdef BUILD_SYSTEM
 276         printf("   Build host:  %s\n", BUILD_SYSTEM);
 277 #endif
 278
 279         printf("Paths:\n");
 280         for (i=0; config_options[i].name; i++) {
 281                 printf("   %s: %s\n", config_options[i].name, config_options[i].value);
 282         }
 283
 284         exit(0);
 285 }
 286
 287 /*
 288  main server.
 289 */
 290 static int binary_smbd_main(const char *binary_name, int argc, const char *argv[])
 291 {
 292         bool opt_daemon = false;
 293         bool opt_interactive = false;
 294         int opt;
 295         poptContext pc;
 296 #define _MODULE_PROTO(init) extern NTSTATUS init(void);
 297         STATIC_service_MODULES_PROTO;
 298         init_module_fn static_init[] = { STATIC_service_MODULES };
 299         init_module_fn *shared_init;
 300         struct tevent_context *event_ctx;
 301         uint16_t stdin_event_flags;
 302         NTSTATUS status;
 303         const char *model = "standard";
 304         int max_runtime = 0;
 305         enum {
 306                 OPT_DAEMON = 1000,
 307                 OPT_INTERACTIVE,
 308                 OPT_PROCESS_MODEL,
 309                 OPT_SHOW_BUILD
 310         };
 311         struct poptOption long_options[] = {
 312                 POPT_AUTOHELP
 313                 {"daemon", 'D', POPT_ARG_NONE, NULL, OPT_DAEMON,
 314                  "Become a daemon (default)", NULL },
 315                 {"interactive", 'i', POPT_ARG_NONE, NULL, OPT_INTERACTIVE,
 316                  "Run interactive (not a daemon)", NULL},
 317                 {"model", 'M', POPT_ARG_STRING, NULL, OPT_PROCESS_MODEL,
 318                  "Select process model", "MODEL"},
 319                 {"maximum-runtime",0, POPT_ARG_INT, &max_runtime, 0,
 320                  "set maximum runtime of the server process, till autotermination", "seconds"},
 321                 {"show-build", 'b', POPT_ARG_NONE, NULL, OPT_SHOW_BUILD, "show build info", NULL },
 322                 POPT_COMMON_SAMBA
 323                 POPT_COMMON_VERSION
 324                 { NULL }
 325         };
 326
 327         pc = poptGetContext(binary_name, argc, argv, long_options, 0);
 328         while((opt = poptGetNextOpt(pc)) != -1) {
 329                 switch(opt) {
 330                 case OPT_DAEMON:
 331                         opt_daemon = true;
 332                         break;
 333                 case OPT_INTERACTIVE:
 334                         opt_interactive = true;
 335                         break;
 336                 case OPT_PROCESS_MODEL:
 337                         model = poptGetOptArg(pc);
 338                         break;
 339                 case OPT_SHOW_BUILD:
 340                         show_build();
 341                         break;
 342                 default:
 343                         fprintf(stderr, "\nInvalid option %s: %s\n\n",
 344                                   poptBadOption(pc, 0), poptStrerror(opt));
 345                         poptPrintUsage(pc, stderr, 0);
 346                         return 1;
 347                 }
 348         }
 349
 350         if (opt_daemon && opt_interactive) {
 351                 fprintf(stderr,"\nERROR: "
 352                           "Option -i|--interactive is not allowed together with -D|--daemon\n\n");
 353                 poptPrintUsage(pc, stderr, 0);
 354                 return 1;
 355         } else if (!opt_interactive) {
 356                 /* default is --daemon */
 357                 opt_daemon = true;
 358         }
 359
 360         poptFreeContext(pc);
 361
 362         setup_logging(binary_name, opt_interactive?DEBUG_STDOUT:DEBUG_FILE);
 363         setup_signals();
 364
 365         /* we want total control over the permissions on created files,
 366            so set our umask to 0 */
 367         umask(0);
 368
 369         DEBUG(0,("%s version %s started.\n", binary_name, SAMBA_VERSION_STRING));
 370         DEBUGADD(0,("Copyright Andrew Tridgell and the Samba Team 1992-2013\n"));
 371
 372         if (sizeof(uint16_t) < 2 || sizeof(uint32_t) < 4 || sizeof(uint64_t) < 8) {
 373                 DEBUG(0,("ERROR: Samba is not configured correctly for the word size on your machine\n"));
 374                 DEBUGADD(0,("sizeof(uint16_t) = %u, sizeof(uint32_t) %u, sizeof(uint64_t) = %u\n",
 375                             (unsigned int)sizeof(uint16_t), (unsigned int)sizeof(uint32_t), (unsigned int)sizeof(uint64_t)));
 376                 return 1;
 377         }
 378
 379         if (opt_daemon) {
 380                 DEBUG(3,("Becoming a daemon.\n"));
 381                 become_daemon(true, false, false);
 382         }
 383
 384         cleanup_tmp_files(cmdline_lp_ctx);
 385
 386         if (!directory_exist(lpcfg_lockdir(cmdline_lp_ctx))) {
 387                 mkdir(lpcfg_lockdir(cmdline_lp_ctx), 0755);
 388         }
 389
 390         pidfile_create(lpcfg_piddir(cmdline_lp_ctx), binary_name);
 391
 392         /* Set up a database to hold a random seed, in case we don't
 393          * have /dev/urandom */
 394         if (!randseed_init(talloc_autofree_context(), cmdline_lp_ctx)) {
 395                 return 1;
 396         }
 397
 398         if (lpcfg_server_role(cmdline_lp_ctx) == ROLE_ACTIVE_DIRECTORY_DC) {
 399                 if (!open_schannel_session_store(talloc_autofree_context(), cmdline_lp_ctx)) {
 400                         DEBUG(0,("ERROR: Samba cannot open schannel store for secured NETLOGON operations.\n"));
 401                         exit(1);
 402                 }
 403         }
 404
 405         gensec_init(); /* FIXME: */
 406
 407         ntptr_init();   /* FIXME: maybe run this in the initialization function
 408                                                 of the spoolss RPC server instead? */
 409
 410         ntvfs_init(cmdline_lp_ctx);     /* FIXME: maybe run this in the initialization functions
 411                                                 of the SMB[,2] server instead? */
 412
 413         process_model_init(cmdline_lp_ctx);
 414
 415         shared_init = load_samba_modules(NULL, "service");
 416
 417         run_init_functions(static_init);
 418         run_init_functions(shared_init);
 419
 420         talloc_free(shared_init);
 421
 422         /* the event context is the top level structure in smbd. Everything else
 423            should hang off that */
 424         event_ctx = s4_event_context_init(talloc_autofree_context());
 425
 426         if (event_ctx == NULL) {
 427                 DEBUG(0,("Initializing event context failed\n"));
 428                 return 1;
 429         }
 430
 431         if (opt_interactive) {
 432                 /* terminate when stdin goes away */
 433                 stdin_event_flags = TEVENT_FD_READ;
 434         } else {
 435                 /* stay alive forever */
 436                 stdin_event_flags = 0;
 437         }
 438
 439         /* catch EOF on stdin */
 440 #ifdef SIGTTIN
 441         signal(SIGTTIN, SIG_IGN);
 442 #endif
 443         tevent_add_fd(event_ctx, event_ctx, 0, stdin_event_flags,
 444                       server_stdin_handler,
 445                       discard_const(binary_name));
 446
 447         if (max_runtime) {
 448                 DEBUG(0,("Called with maxruntime %d - current ts %llu\n",
 449                       max_runtime, (unsigned long long) time(NULL)));
 450                 tevent_add_timer(event_ctx, event_ctx,
 451                                  timeval_current_ofs(max_runtime, 0),
 452                                  max_runtime_handler,
 453                                  discard_const(binary_name));
 454         }
 455
 456         if (lpcfg_server_role(cmdline_lp_ctx) != ROLE_ACTIVE_DIRECTORY_DC
 457             && !lpcfg_parm_bool(cmdline_lp_ctx, NULL, "server role check", "inhibit", false)
 458             && !str_list_check_ci(lpcfg_server_services(cmdline_lp_ctx), "smb")
 459             && !str_list_check_ci(lpcfg_dcerpc_endpoint_servers(cmdline_lp_ctx), "remote")
 460             && !str_list_check_ci(lpcfg_dcerpc_endpoint_servers(cmdline_lp_ctx), "mapiproxy")) {
 461                 DEBUG(0, ("At this time the 'samba' binary should only be used for either:\n"));
 462                 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"));
 463                 DEBUGADD(0, ("You should start smbd/nmbd/winbindd instead for domain member and standalone file server tasks\n"));
 464                 exit(1);
 465         };
 466
 467         prime_ldb_databases(event_ctx);
 468
 469         status = setup_parent_messaging(event_ctx, cmdline_lp_ctx);
 470         if (!NT_STATUS_IS_OK(status)) {
 471                 DEBUG(0,("Failed to setup parent messaging - %s\n", nt_errstr(status)));
 472                 return 1;
 473         }
 474
 475         DEBUG(0,("%s: using '%s' process model\n", binary_name, model));
 476
 477         status = server_service_startup(event_ctx, cmdline_lp_ctx, model,
 478                                         lpcfg_server_services(cmdline_lp_ctx));
 479         if (!NT_STATUS_IS_OK(status)) {
 480                 DEBUG(0,("Starting Services failed - %s\n", nt_errstr(status)));
 481                 return 1;
 482         }
 483
 484         /* wait for events - this is where smbd sits for most of its
 485            life */
 486         tevent_loop_wait(event_ctx);
 487
 488         /* as everything hangs off this event context, freeing it
 489            should initiate a clean shutdown of all services */
 490         talloc_free(event_ctx);
 491
 492         return 0;
 493 }
 494
 495 int main(int argc, const char *argv[])
 496 {
 497         return binary_smbd_main("samba", argc, argv);
 498 }