bus.c 40.7 KB
Newer Older
1
/* -*- mode: C; c-file-style: "gnu"; indent-tabs-mode: nil; -*- */
2 3
/* bus.c  message bus context object
 *
4
 * Copyright (C) 2003, 2004 Red Hat, Inc.
5
 *
6
 * Licensed under the Academic Free License version 2.1
7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28
 * 
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 */

#include "bus.h"
#include "activation.h"
#include "connection.h"
#include "services.h"
#include "utils.h"
29
#include "policy.h"
30
#include "config-parser.h"
31
#include "signals.h"
32
#include "selinux.h"
33
#include "dir-watch.h"
34 35
#include <dbus/dbus-list.h>
#include <dbus/dbus-hash.h>
36 37 38 39 40
#include <dbus/dbus-internals.h>

struct BusContext
{
  int refcount;
41
  DBusGUID uuid;
42
  char *config_file;
43
  char *type;
44
  char *servicehelper;
45
  char *address;
46
  char *pidfile;
47
  char *user;
48
  DBusLoop *loop;
49
  DBusList *servers;
50 51 52
  BusConnections *connections;
  BusActivation *activation;
  BusRegistry *registry;
53
  BusPolicy *policy;
54
  BusMatchmaker *matchmaker;
55
  BusLimits limits;
56
  unsigned int fork : 1;
57
  unsigned int syslog : 1;
58 59
};

60
static dbus_int32_t server_data_slot = -1;
61 62 63 64 65 66 67 68 69 70 71 72 73 74

typedef struct
{
  BusContext *context;
} BusServerData;

#define BUS_SERVER_DATA(server) (dbus_server_get_data ((server), server_data_slot))

static BusContext*
server_get_context (DBusServer *server)
{
  BusContext *context;
  BusServerData *bd;
  
75
  if (!dbus_server_allocate_data_slot (&server_data_slot))
76 77 78 79
    return NULL;

  bd = BUS_SERVER_DATA (server);
  if (bd == NULL)
80
    {
81
      dbus_server_free_data_slot (&server_data_slot);
82 83
      return NULL;
    }
84 85 86

  context = bd->context;

87
  dbus_server_free_data_slot (&server_data_slot);
88 89 90 91

  return context;
}

92
static dbus_bool_t
93 94 95 96
server_watch_callback (DBusWatch     *watch,
                       unsigned int   condition,
                       void          *data)
{
97 98 99 100 101 102
  /* FIXME this can be done in dbus-mainloop.c
   * if the code in activation.c for the babysitter
   * watch handler is fixed.
   */
  
  return dbus_watch_handle (watch, condition);
103 104
}

105
static dbus_bool_t
106
add_server_watch (DBusWatch  *watch,
107
                  void       *data)
108
{
109 110 111 112 113
  DBusServer *server = data;
  BusContext *context;
  
  context = server_get_context (server);
  
114 115 116
  return _dbus_loop_add_watch (context->loop,
                               watch, server_watch_callback, server,
                               NULL);
117 118 119 120
}

static void
remove_server_watch (DBusWatch  *watch,
121
                     void       *data)
122
{
123 124 125 126 127
  DBusServer *server = data;
  BusContext *context;
  
  context = server_get_context (server);
  
128 129
  _dbus_loop_remove_watch (context->loop,
                           watch, server_watch_callback, server);
130 131
}

132

133 134 135 136
static void
server_timeout_callback (DBusTimeout   *timeout,
                         void          *data)
{
137
  /* can return FALSE on OOM but we just let it fire again later */
138 139 140 141 142
  dbus_timeout_handle (timeout);
}

static dbus_bool_t
add_server_timeout (DBusTimeout *timeout,
143
                    void        *data)
144
{
145 146 147 148 149
  DBusServer *server = data;
  BusContext *context;
  
  context = server_get_context (server);

150 151
  return _dbus_loop_add_timeout (context->loop,
                                 timeout, server_timeout_callback, server, NULL);
152 153 154 155
}

static void
remove_server_timeout (DBusTimeout *timeout,
156
                       void        *data)
157
{
158 159 160 161 162
  DBusServer *server = data;
  BusContext *context;
  
  context = server_get_context (server);
  
163 164
  _dbus_loop_remove_timeout (context->loop,
                             timeout, server_timeout_callback, server);
165 166
}

167 168 169 170 171 172 173 174
static void
new_connection_callback (DBusServer     *server,
                         DBusConnection *new_connection,
                         void           *data)
{
  BusContext *context = data;
  
  if (!bus_connections_setup_connection (context->connections, new_connection))
175 176
    {
      _dbus_verbose ("No memory to setup new connection\n");
177

178 179 180 181 182
      /* if we don't do this, it will get unref'd without
       * being disconnected... kind of strange really
       * that we have to do this, people won't get it right
       * in general.
       */
183
      dbus_connection_close (new_connection);
184
    }
185 186

  dbus_connection_set_max_received_size (new_connection,
187
                                         context->limits.max_incoming_bytes);
188 189

  dbus_connection_set_max_message_size (new_connection,
190
                                        context->limits.max_message_size);
191
  
192
  /* on OOM, we won't have ref'd the connection so it will die. */
193 194
}

195 196 197 198 199 200 201 202
static void
free_server_data (void *data)
{
  BusServerData *bd = data;  
  
  dbus_free (bd);
}

203 204 205
static dbus_bool_t
setup_server (BusContext *context,
              DBusServer *server,
206
              char      **auth_mechanisms,
207
              DBusError  *error)
208
{
209
  BusServerData *bd;
210 211

  bd = dbus_new0 (BusServerData, 1);
212 213 214
  if (bd == NULL || !dbus_server_set_data (server,
                                           server_data_slot,
                                           bd, free_server_data))
215 216 217 218 219 220 221
    {
      dbus_free (bd);
      BUS_SET_OOM (error);
      return FALSE;
    }

  bd->context = context;
222
  
223 224 225 226 227 228
  if (!dbus_server_set_auth_mechanisms (server, (const char**) auth_mechanisms))
    {
      BUS_SET_OOM (error);
      return FALSE;
    }
  
229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252
  dbus_server_set_new_connection_function (server,
                                           new_connection_callback,
                                           context, NULL);
  
  if (!dbus_server_set_watch_functions (server,
                                        add_server_watch,
                                        remove_server_watch,
                                        NULL,
                                        server,
                                        NULL))
    {
      BUS_SET_OOM (error);
      return FALSE;
    }

  if (!dbus_server_set_timeout_functions (server,
                                          add_server_timeout,
                                          remove_server_timeout,
                                          NULL,
                                          server, NULL))
    {
      BUS_SET_OOM (error);
      return FALSE;
    }
253
  
254 255 256
  return TRUE;
}

257
/* This code only gets executed the first time the
258 259 260
 * config files are parsed.  It is not executed
 * when config files are reloaded.
 */
261 262 263 264
static dbus_bool_t
process_config_first_time_only (BusContext      *context,
				BusConfigParser *parser,
				DBusError       *error)
265
{
266 267
  DBusList *link;
  DBusList **addresses;
268
  const char *user, *pidfile;
269 270 271
  char **auth_mechanisms;
  DBusList **auth_mechanisms_list;
  int len;
272
  dbus_bool_t retval;
273

274
  _DBUS_ASSERT_ERROR_IS_CLEAR (error);
275

276
  retval = FALSE;
277
  auth_mechanisms = NULL;
278 279 280 281 282 283 284 285 286 287 288 289 290 291

  /* Check for an existing pid file. Of course this is a race;
   * we'd have to use fcntl() locks on the pid file to
   * avoid that. But we want to check for the pid file
   * before overwriting any existing sockets, etc.
   */
  pidfile = bus_config_parser_get_pidfile (parser);
  if (pidfile != NULL)
    {
      DBusString u;
      DBusStat stbuf;
      
      _dbus_string_init_const (&u, pidfile);
      
292
      if (_dbus_stat (&u, &stbuf, NULL))
293 294 295 296 297 298 299
	{
	  dbus_set_error (error, DBUS_ERROR_FAILED,
			  "The pid file \"%s\" exists, if the message bus is not running, remove this file",
			  pidfile);
	  goto failed;
	}
    }
300
  
301 302
  /* keep around the pid filename so we can delete it later */
  context->pidfile = _dbus_strdup (pidfile);
303 304 305 306 307 308 309 310 311 312 313 314

  /* Build an array of auth mechanisms */
  
  auth_mechanisms_list = bus_config_parser_get_mechanisms (parser);
  len = _dbus_list_get_length (auth_mechanisms_list);

  if (len > 0)
    {
      int i;

      auth_mechanisms = dbus_new0 (char*, len + 1);
      if (auth_mechanisms == NULL)
315 316 317 318
	{
	  BUS_SET_OOM (error);
	  goto failed;
	}
319 320 321 322 323 324 325
      
      i = 0;
      link = _dbus_list_get_first_link (auth_mechanisms_list);
      while (link != NULL)
        {
          auth_mechanisms[i] = _dbus_strdup (link->data);
          if (auth_mechanisms[i] == NULL)
326 327 328 329
	    {
	      BUS_SET_OOM (error);
	      goto failed;
	    }
330 331 332 333 334 335 336 337 338
          link = _dbus_list_get_next_link (auth_mechanisms_list, link);
        }
    }
  else
    {
      auth_mechanisms = NULL;
    }

  /* Listen on our addresses */
339 340 341 342 343 344 345 346 347 348
  
  addresses = bus_config_parser_get_addresses (parser);  
  
  link = _dbus_list_get_first_link (addresses);
  while (link != NULL)
    {
      DBusServer *server;
      
      server = dbus_server_listen (link->data, error);
      if (server == NULL)
349 350 351 352
	{
	  _DBUS_ASSERT_ERROR_IS_SET (error);
	  goto failed;
	}
353
      else if (!setup_server (context, server, auth_mechanisms, error))
354 355 356 357
	{
	  _DBUS_ASSERT_ERROR_IS_SET (error);
	  goto failed;
	}
358 359 360 361 362 363 364 365 366 367

      if (!_dbus_list_append (&context->servers, server))
        {
          BUS_SET_OOM (error);
          goto failed;
        }          
      
      link = _dbus_list_get_next_link (addresses, link);
    }

368 369
  /* note that type may be NULL */
  context->type = _dbus_strdup (bus_config_parser_get_type (parser));
370 371 372 373 374
  if (bus_config_parser_get_type (parser) != NULL && context->type == NULL)
    {
      BUS_SET_OOM (error);
      goto failed;
    }
375 376 377 378 379 380 381 382 383 384 385 386 387

  user = bus_config_parser_get_user (parser);
  if (user != NULL)
    {
      context->user = _dbus_strdup (user);
      if (context->user == NULL)
	{
	  BUS_SET_OOM (error);
	  goto failed;
	}
    }

  context->fork = bus_config_parser_get_fork (parser);
388
  context->syslog = bus_config_parser_get_syslog (parser);
389
  
390 391 392 393 394 395 396 397 398
  _DBUS_ASSERT_ERROR_IS_CLEAR (error);
  retval = TRUE;

 failed:
  dbus_free_string_array (auth_mechanisms);
  return retval;
}

/* This code gets executed every time the config files
399 400 401 402 403
 * are parsed: both during BusContext construction
 * and on reloads. This function is slightly screwy
 * since it can do a "half reload" in out-of-memory
 * situations. Realistically, unlikely to ever matter.
 */
404 405 406 407 408 409 410 411
static dbus_bool_t
process_config_every_time (BusContext      *context,
			   BusConfigParser *parser,
			   dbus_bool_t      is_reload,
			   DBusError       *error)
{
  DBusString full_address;
  DBusList *link;
412
  DBusList **dirs;
413
  BusActivation *new_activation;
414
  char *addr;
415 416 417
  const char *servicehelper;
  char *s;
  
418 419 420 421
  dbus_bool_t retval;

  _DBUS_ASSERT_ERROR_IS_CLEAR (error);

422
  addr = NULL;
423 424 425 426 427 428 429 430 431 432 433 434 435 436
  retval = FALSE;

  if (!_dbus_string_init (&full_address))
    {
      BUS_SET_OOM (error);
      return FALSE;
    }

  /* get our limits and timeout lengths */
  bus_config_parser_get_limits (parser, &context->limits);

  context->policy = bus_config_parser_steal_policy (parser);
  _dbus_assert (context->policy != NULL);

437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457
  /* We have to build the address backward, so that
   * <listen> later in the config file have priority
   */
  link = _dbus_list_get_last_link (&context->servers);
  while (link != NULL)
    {
      addr = dbus_server_get_address (link->data);
      if (addr == NULL)
        {
          BUS_SET_OOM (error);
          goto failed;
        }

      if (_dbus_string_get_length (&full_address) > 0)
        {
          if (!_dbus_string_append (&full_address, ";"))
            {
              BUS_SET_OOM (error);
              goto failed;
            }
        }
458

459 460 461 462 463 464 465
      if (!_dbus_string_append (&full_address, addr))
        {
          BUS_SET_OOM (error);
          goto failed;
        }

      dbus_free (addr);
466
      addr = NULL;
467 468 469 470

      link = _dbus_list_get_prev_link (&context->servers, link);
    }

471 472 473
  if (is_reload)
    dbus_free (context->address);

474
  if (!_dbus_string_copy_data (&full_address, &context->address))
475 476 477 478
    {
      BUS_SET_OOM (error);
      goto failed;
    }
479

480 481 482
  /* get the service directories */
  dirs = bus_config_parser_get_service_dirs (parser);

483 484 485 486 487 488 489 490 491 492 493 494 495 496 497
  /* and the service helper */
  servicehelper = bus_config_parser_get_servicehelper (parser);

  s = _dbus_strdup(servicehelper);
  if (s == NULL && servicehelper != NULL)
    {
      BUS_SET_OOM (error);
      goto failed;
    }
  else
    {
      dbus_free(context->servicehelper);
      context->servicehelper = s;
    }
  
498
  /* Create activation subsystem */
499
  new_activation = bus_activation_new (context, &full_address,
500
                                       dirs, error);
501
  if (new_activation == NULL)
502 503 504 505 506
    {
      _DBUS_ASSERT_ERROR_IS_SET (error);
      goto failed;
    }

507 508 509 510 511
  if (is_reload)
    bus_activation_unref (context->activation);

  context->activation = new_activation;

512
  /* Drop existing conf-dir watches (if applicable) */
513 514 515 516

  if (is_reload)
    bus_drop_all_directory_watches ();

517 518 519 520 521
  _DBUS_ASSERT_ERROR_IS_CLEAR (error);
  retval = TRUE;

 failed:
  _dbus_string_free (&full_address);
522 523
  
  if (addr)
John Palmieri's avatar
John Palmieri committed
524
    dbus_free (addr);
525

526 527 528 529
  return retval;
}

static dbus_bool_t
530
process_config_postinit (BusContext      *context,
531
			 BusConfigParser *parser,
532
			 DBusError       *error)
533
{
534
  DBusHashTable *service_context_table;
535

536 537 538
  service_context_table = bus_config_parser_steal_service_context_table (parser);
  if (!bus_registry_set_service_context_table (context->registry,
					       service_context_table))
539
    {
540 541
      BUS_SET_OOM (error);
      return FALSE;
542 543
    }

544
  _dbus_hash_table_unref (service_context_table);
545 546 547 548

  /* Watch all conf directories */
  _dbus_list_foreach (bus_config_parser_get_conf_dirs (parser),
		      (DBusForeachFunction) bus_watch_directory,
549
		      context);
550

551
  return TRUE;
552 553 554 555
}

BusContext*
bus_context_new (const DBusString *config_file,
556
                 ForceForkSetting  force_fork,
557 558
                 DBusPipe         *print_addr_pipe,
                 DBusPipe         *print_pid_pipe,
559 560 561
                 DBusError        *error)
{
  BusContext *context;
562
  BusConfigParser *parser;
John Palmieri's avatar
John Palmieri committed
563

564 565
  _DBUS_ASSERT_ERROR_IS_CLEAR (error);

566 567 568
  context = NULL;
  parser = NULL;

569 570 571 572 573 574 575 576 577 578 579 580 581 582
  if (!dbus_server_allocate_data_slot (&server_data_slot))
    {
      BUS_SET_OOM (error);
      return NULL;
    }

  context = dbus_new0 (BusContext, 1);
  if (context == NULL)
    {
      BUS_SET_OOM (error);
      goto failed;
    }
  context->refcount = 1;

583 584
  _dbus_generate_uuid (&context->uuid);
  
585 586 587 588 589 590 591 592 593 594 595 596 597
  if (!_dbus_string_copy_data (config_file, &context->config_file))
    {
      BUS_SET_OOM (error);
      goto failed;
    }

  context->loop = _dbus_loop_new ();
  if (context->loop == NULL)
    {
      BUS_SET_OOM (error);
      goto failed;
    }

598 599 600 601 602 603
  context->registry = bus_registry_new (context);
  if (context->registry == NULL)
    {
      BUS_SET_OOM (error);
      goto failed;
    }
604 605 606 607 608 609 610

  parser = bus_config_load (config_file, TRUE, NULL, error);
  if (parser == NULL)
    {
      _DBUS_ASSERT_ERROR_IS_SET (error);
      goto failed;
    }
611
  
612 613 614 615 616 617
  if (!process_config_first_time_only (context, parser, error))
    {
      _DBUS_ASSERT_ERROR_IS_SET (error);
      goto failed;
    }
  if (!process_config_every_time (context, parser, FALSE, error))
618 619 620 621 622 623 624 625 626 627 628
    {
      _DBUS_ASSERT_ERROR_IS_SET (error);
      goto failed;
    }
  
  /* we need another ref of the server data slot for the context
   * to own
   */
  if (!dbus_server_allocate_data_slot (&server_data_slot))
    _dbus_assert_not_reached ("second ref of server data slot failed");

629
  /* Note that we don't know whether the print_addr_pipe is
630 631 632 633
   * one of the sockets we're using to listen on, or some
   * other random thing. But I think the answer is "don't do
   * that then"
   */
634
  if (print_addr_pipe != NULL && _dbus_pipe_is_valid (print_addr_pipe))
635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655
    {
      DBusString addr;
      const char *a = bus_context_get_address (context);
      int bytes;
      
      _dbus_assert (a != NULL);
      if (!_dbus_string_init (&addr))
        {
          BUS_SET_OOM (error);
          goto failed;
        }
      
      if (!_dbus_string_append (&addr, a) ||
          !_dbus_string_append (&addr, "\n"))
        {
          _dbus_string_free (&addr);
          BUS_SET_OOM (error);
          goto failed;
        }

      bytes = _dbus_string_get_length (&addr);
656
      if (_dbus_pipe_write (print_addr_pipe, &addr, 0, bytes, error) != bytes)
657
        {
658 659 660 661 662 663
          /* pipe write returns an error on failure but not short write */
          if (error != NULL && !dbus_error_is_set (error))
            {
              dbus_set_error (error, DBUS_ERROR_FAILED,
                              "Printing message bus address: did not write all bytes\n");
            }
664 665 666 667
          _dbus_string_free (&addr);
          goto failed;
        }

668 669
      if (!_dbus_pipe_is_stdout_or_stderr (print_addr_pipe))
        _dbus_pipe_close (print_addr_pipe, NULL);
670
      
671 672 673
      _dbus_string_free (&addr);
    }
  
674 675 676 677 678 679 680
  context->connections = bus_connections_new (context);
  if (context->connections == NULL)
    {
      BUS_SET_OOM (error);
      goto failed;
    }

681 682 683 684 685 686
  context->matchmaker = bus_matchmaker_new ();
  if (context->matchmaker == NULL)
    {
      BUS_SET_OOM (error);
      goto failed;
    }
John Palmieri's avatar
John Palmieri committed
687 688 689 690

  /* check user before we fork */
  if (context->user != NULL)
    {
691
      if (!_dbus_verify_daemon_user (context->user))
John Palmieri's avatar
John Palmieri committed
692 693 694 695 696 697 698 699
        {
          dbus_set_error (error, DBUS_ERROR_FAILED,
                          "Could not get UID and GID for username \"%s\"",
                          context->user);
          goto failed;
        }
    }

700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741
  /* Now become a daemon if appropriate and write out pid file in any case */
  {
    DBusString u;

    if (context->pidfile)
      _dbus_string_init_const (&u, context->pidfile);

    if ((force_fork != FORK_NEVER && context->fork) || force_fork == FORK_ALWAYS)
      {
        _dbus_verbose ("Forking and becoming daemon\n");
        
        if (!_dbus_become_daemon (context->pidfile ? &u : NULL, 
                                  print_pid_pipe,
                                  error))
          {
            _DBUS_ASSERT_ERROR_IS_SET (error);
            goto failed;
          }
      }
    else
      {
        _dbus_verbose ("Fork not requested\n");
        
        /* Need to write PID file and to PID pipe for ourselves,
         * not for the child process. This is a no-op if the pidfile
         * is NULL and print_pid_pipe is NULL.
         */
        if (!_dbus_write_pid_to_file_and_pipe (context->pidfile ? &u : NULL,
                                               print_pid_pipe,
                                               _dbus_getpid (),
                                               error))
          {
            _DBUS_ASSERT_ERROR_IS_SET (error);
            goto failed;
          }
      }
  }

  if (print_pid_pipe && _dbus_pipe_is_valid (print_pid_pipe) &&
      !_dbus_pipe_is_stdout_or_stderr (print_pid_pipe))
    _dbus_pipe_close (print_pid_pipe, NULL);
  
742 743 744 745 746
  if (!process_config_postinit (context, parser, error))
    {
      _DBUS_ASSERT_ERROR_IS_SET (error);
      goto failed;
    }
747

748
  if (parser != NULL)
749 750 751 752
    {
      bus_config_parser_unref (parser);
      parser = NULL;
    }
753
  
754 755 756
  /* Here we change our credentials if required,
   * as soon as we've set up our sockets and pidfile
   */
757
  if (context->user != NULL)
758
    {
759
      if (!_dbus_change_to_daemon_user (context->user, error))
760 761 762 763
	{
	  _DBUS_ASSERT_ERROR_IS_SET (error);
	  goto failed;
	}
764 765

#ifdef HAVE_SELINUX
766 767
      /* FIXME - why not just put this in full_init() below? */
      bus_selinux_audit_init ();
768
#endif
769
    }
770 771 772 773 774

  if (!bus_selinux_full_init ())
    {
      _dbus_warn ("SELinux initialization failed\n");
    }
775
  
776
  dbus_server_free_data_slot (&server_data_slot);
777 778 779
  
  return context;
  
780
 failed:  
781 782
  if (parser != NULL)
    bus_config_parser_unref (parser);
783 784 785
  if (context != NULL)
    bus_context_unref (context);

786 787
  if (server_data_slot >= 0)
    dbus_server_free_data_slot (&server_data_slot);
788
  
789 790 791
  return NULL;
}

792 793 794 795 796 797 798
dbus_bool_t
bus_context_get_id (BusContext       *context,
                    DBusString       *uuid)
{
  return _dbus_uuid_encode (&context->uuid, uuid);
}

799 800 801 802
dbus_bool_t
bus_context_reload_config (BusContext *context,
			   DBusError  *error)
{
803 804 805 806
  BusConfigParser *parser;
  DBusString config_file;
  dbus_bool_t ret;

807
  /* Flush the user database cache */
808
  _dbus_flush_caches ();
809

810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830
  ret = FALSE;
  _dbus_string_init_const (&config_file, context->config_file);
  parser = bus_config_load (&config_file, TRUE, NULL, error);
  if (parser == NULL)
    {
      _DBUS_ASSERT_ERROR_IS_SET (error);
      goto failed;
    }
  
  if (!process_config_every_time (context, parser, TRUE, error))
    {
      _DBUS_ASSERT_ERROR_IS_SET (error);
      goto failed;
    }
  if (!process_config_postinit (context, parser, error))
    {
      _DBUS_ASSERT_ERROR_IS_SET (error);
      goto failed;
    }
  ret = TRUE;

831
  bus_context_log_info (context, "Reloaded configuration");
832
 failed:  
833 834
  if (!ret)
    bus_context_log_info (context, "Unable to reload configuration: %s", error->message);
835 836 837
  if (parser != NULL)
    bus_config_parser_unref (parser);
  return ret;
838 839
}

840 841 842
static void
shutdown_server (BusContext *context,
                 DBusServer *server)
843
{
844 845
  if (server == NULL ||
      !dbus_server_get_is_connected (server))
846 847
    return;
  
848
  if (!dbus_server_set_watch_functions (server,
849
                                        NULL, NULL, NULL,
850 851 852 853
                                        context,
                                        NULL))
    _dbus_assert_not_reached ("setting watch functions to NULL failed");
  
854
  if (!dbus_server_set_timeout_functions (server,
855
                                          NULL, NULL, NULL,
856 857 858 859
                                          context,
                                          NULL))
    _dbus_assert_not_reached ("setting timeout functions to NULL failed");
  
860 861 862 863 864 865 866 867 868 869 870 871 872 873 874
  dbus_server_disconnect (server);
}

void
bus_context_shutdown (BusContext  *context)
{
  DBusList *link;

  link = _dbus_list_get_first_link (&context->servers);
  while (link != NULL)
    {
      shutdown_server (context, link->data);

      link = _dbus_list_get_next_link (&context->servers, link);
    }
875 876
}

877
BusContext *
878 879 880 881
bus_context_ref (BusContext *context)
{
  _dbus_assert (context->refcount > 0);
  context->refcount += 1;
882 883

  return context;
884 885 886 887 888 889 890 891 892 893
}

void
bus_context_unref (BusContext *context)
{
  _dbus_assert (context->refcount > 0);
  context->refcount -= 1;

  if (context->refcount == 0)
    {
894 895
      DBusList *link;
      
896 897
      _dbus_verbose ("Finalizing bus context %p\n", context);
      
898
      bus_context_shutdown (context);
899 900 901 902 903 904

      if (context->connections)
        {
          bus_connections_unref (context->connections);
          context->connections = NULL;
        }
905
      
906
      if (context->registry)
907 908 909 910 911
        {
          bus_registry_unref (context->registry);
          context->registry = NULL;
        }
      
912
      if (context->activation)
913 914 915 916
        {
          bus_activation_unref (context->activation);
          context->activation = NULL;
        }
917 918 919

      link = _dbus_list_get_first_link (&context->servers);
      while (link != NULL)
920
        {
921 922 923
          dbus_server_unref (link->data);
          
          link = _dbus_list_get_next_link (&context->servers, link);
924
        }
925
      _dbus_list_clear (&context->servers);
926

927
      if (context->policy)
928
        {
929 930
          bus_policy_unref (context->policy);
          context->policy = NULL;
931
        }
932
      
933 934
      if (context->loop)
        {
935
          _dbus_loop_unref (context->loop);
936 937
          context->loop = NULL;
        }
938 939 940 941 942 943

      if (context->matchmaker)
        {
          bus_matchmaker_unref (context->matchmaker);
          context->matchmaker = NULL;
        }
944
      
945
      dbus_free (context->config_file);
946
      dbus_free (context->type);
947
      dbus_free (context->address);
948
      dbus_free (context->user);
949
      dbus_free (context->servicehelper);
950 951 952 953 954 955 956 957 958 959 960 961 962

      if (context->pidfile)
	{
          DBusString u;
          _dbus_string_init_const (&u, context->pidfile);

          /* Deliberately ignore errors here, since there's not much
	   * we can do about it, and we're exiting anyways.
	   */
	  _dbus_delete_file (&u, NULL);

          dbus_free (context->pidfile); 
	}
963
      dbus_free (context);
964

965
      dbus_server_free_data_slot (&server_data_slot);
966 967 968
    }
}

969 970 971 972 973 974 975
/* type may be NULL */
const char*
bus_context_get_type (BusContext *context)
{
  return context->type;
}

976 977 978 979 980 981
const char*
bus_context_get_address (BusContext *context)
{
  return context->address;
}

982 983 984 985 986 987
const char*
bus_context_get_servicehelper (BusContext *context)
{
  return context->servicehelper;
}

988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004
BusRegistry*
bus_context_get_registry (BusContext  *context)
{
  return context->registry;
}

BusConnections*
bus_context_get_connections (BusContext  *context)
{
  return context->connections;
}

BusActivation*
bus_context_get_activation (BusContext  *context)
{
  return context->activation;
}
1005

1006 1007 1008 1009 1010 1011
BusMatchmaker*
bus_context_get_matchmaker (BusContext  *context)
{
  return context->matchmaker;
}

1012
DBusLoop*
1013 1014 1015 1016 1017
bus_context_get_loop (BusContext *context)
{
  return context->loop;
}

1018
dbus_bool_t
1019 1020
bus_context_allow_unix_user (BusContext   *context,
                             unsigned long uid)
1021
{
1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035
  return bus_policy_allow_unix_user (context->policy,
                                     uid);
}

/* For now this is never actually called because the default
 * DBusConnection behavior of 'same user that owns the bus can connect'
 * is all it would do.
 */
dbus_bool_t
bus_context_allow_windows_user (BusContext       *context,
                                const char       *windows_sid)
{
  return bus_policy_allow_windows_user (context->policy,
                                        windows_sid);
1036 1037
}

1038 1039 1040 1041 1042 1043
BusPolicy *
bus_context_get_policy (BusContext *context)
{
  return context->policy;
}

1044 1045
BusClientPolicy*
bus_context_create_client_policy (BusContext      *context,
1046 1047
                                  DBusConnection  *connection,
                                  DBusError       *error)
1048
{
1049 1050 1051
  _DBUS_ASSERT_ERROR_IS_CLEAR (error);
  return bus_policy_create_client_policy (context->policy, connection,
                                          error);
1052
}
1053 1054 1055 1056 1057

int
bus_context_get_activation_timeout (BusContext *context)
{
  
1058
  return context->limits.activation_timeout;
1059
}
1060

1061 1062 1063
int
bus_context_get_auth_timeout (BusContext *context)
{
1064
  return context->limits.auth_timeout;
1065 1066 1067 1068 1069
}

int
bus_context_get_max_completed_connections (BusContext *context)
{
1070
  return context->limits.max_completed_connections;
1071 1072 1073 1074 1075
}

int
bus_context_get_max_incomplete_connections (BusContext *context)
{
1076
  return context->limits.max_incomplete_connections;
1077 1078 1079 1080 1081
}

int
bus_context_get_max_connections_per_user (BusContext *context)
{
1082
  return context->limits.max_connections_per_user;
1083 1084
}

1085 1086 1087 1088 1089 1090 1091 1092 1093 1094 1095 1096
int
bus_context_get_max_pending_activations (BusContext *context)
{
  return context->limits.max_pending_activations;
}

int
bus_context_get_max_services_per_connection (BusContext *context)
{
  return context->limits.max_services_per_connection;
}

1097 1098 1099 1100 1101 1102
int
bus_context_get_max_match_rules_per_connection (BusContext *context)
{
  return context->limits.max_match_rules_per_connection;
}

1103 1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 1114
int
bus_context_get_max_replies_per_connection (BusContext *context)
{
  return context->limits.max_replies_per_connection;
}

int
bus_context_get_reply_timeout (BusContext *context)
{
  return context->limits.reply_timeout;
}

1115 1116 1117 1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129 1130 1131 1132 1133 1134 1135 1136 1137 1138 1139 1140
void
bus_context_log_info (BusContext *context, const char *msg, ...)
{
  va_list args;

  va_start (args, msg);
  
  if (context->syslog)
    _dbus_log_info (msg, args);

  va_end (args);
}

void
bus_context_log_security (BusContext *context, const char *msg, ...)
{
  va_list args;

  va_start (args, msg);
  
  if (context->syslog)
    _dbus_log_security (msg, args);

  va_end (args);
}

1141 1142 1143 1144 1145 1146 1147 1148 1149 1150 1151 1152 1153
/*
 * addressed_recipient is the recipient specified in the message.
 *
 * proposed_recipient is the recipient we're considering sending
 * to right this second, and may be an eavesdropper.
 *
 * sender is the sender of the message.
 *
 * NULL for proposed_recipient or sender definitely means the bus driver.
 *
 * NULL for addressed_recipient may mean the bus driver, or may mean
 * no destination was specified in the message (e.g. a signal).
 */
1154 1155
dbus_bool_t
bus_context_check_security_policy (BusContext     *context,
1156
                                   BusTransaction *transaction,
1157
                                   DBusConnection *sender,
1158 1159
                                   DBusConnection *addressed_recipient,
                                   DBusConnection *proposed_recipient,
1160 1161 1162 1163 1164
                                   DBusMessage    *message,
                                   DBusError      *error)
{
  BusClientPolicy *sender_policy;
  BusClientPolicy *recipient_policy;
1165
  dbus_int32_t toggles;
1166
  int type;
1167
  dbus_bool_t requested_reply;
1168
  const char *sender_name;
1169 1170 1171 1172 1173
  
  type = dbus_message_get_type (message);
  
  /* dispatch.c was supposed to ensure these invariants */
  _dbus_assert (dbus_message_get_destination (message) != NULL ||
1174 1175
                type == DBUS_MESSAGE_TYPE_SIGNAL ||
                (sender == NULL && !bus_connection_is_active (proposed_recipient)));
1176 1177
  _dbus_assert (type == DBUS_MESSAGE_TYPE_SIGNAL ||
                addressed_recipient != NULL ||
1178
                strcmp (dbus_message_get_destination (message), DBUS_SERVICE_DBUS) == 0);
1179 1180 1181 1182 1183 1184

  /* Used in logging below */
  if (sender != NULL)
    sender_name = bus_connection_get_name (sender);
  else
    sender_name = NULL;
1185
  
1186 1187 1188 1189 1190 1191 1192 1193 1194 1195 1196 1197 1198 1199 1200 1201 1202 1203 1204 1205
  switch (type)
    {
    case DBUS_MESSAGE_TYPE_METHOD_CALL:
    case DBUS_MESSAGE_TYPE_SIGNAL:
    case DBUS_MESSAGE_TYPE_METHOD_RETURN:
    case DBUS_MESSAGE_TYPE_ERROR:
      break;
      
    default:
      _dbus_verbose ("security check disallowing message of unknown type %d\n",
                     type);

      dbus_set_error (error, DBUS_ERROR_ACCESS_DENIED,
                      "Message bus will not accept messages of unknown type\n");
              
      return FALSE;
    }

  requested_reply = FALSE;
  
1206 1207
  if (sender != NULL)
    {
1208 1209 1210 1211
      const char *dest;

      dest = dbus_message_get_destination (message);
	
1212 1213 1214
      /* First verify the SELinux access controls.  If allowed then
       * go on with the standard checks.
       */
1215 1216 1217 1218 1219
      if (!bus_selinux_allows_send (sender, proposed_recipient,
				    dbus_message_type_to_string (dbus_message_get_type (message)),
				    dbus_message_get_interface (message),
				    dbus_message_get_member (message),
				    dbus_message_get_error_name (message),
1220
				    dest ? dest : DBUS_SERVICE_DBUS, error))
1221
        {
1222 1223 1224 1225 1226
          if (error != NULL && !dbus_error_is_set (error))
            {
              dbus_set_error (error, DBUS_ERROR_ACCESS_DENIED,
                              "An SELinux policy prevents this sender "
                              "from sending this message to this recipient "
1227
                              "(rejected message had sender \"%s\" interface \"%s\" "
1228
                              "member \"%s\" error name \"%s\" destination \"%s\")",
1229
                              sender_name ? sender_name : "(unset)",
1230 1231 1232 1233 1234 1235 1236 1237 1238
                              dbus_message_get_interface (message) ?
                              dbus_message_get_interface (message) : "(unset)",
                              dbus_message_get_member (message) ?
                              dbus_message_get_member (message) : "(unset)",
                              dbus_message_get_error_name (message) ?
                              dbus_message_get_error_name (message) : "(unset)",
                              dest ? dest : DBUS_SERVICE_DBUS);
              _dbus_verbose ("SELinux security check denying send to service\n");
            }
1239

1240 1241 1242
          return FALSE;
        }
       
1243
      if (bus_connection_is_active (sender))
1244
        {
1245 1246
          sender_policy = bus_connection_get_policy (sender);
          _dbus_assert (sender_policy != NULL);
1247 1248 1249 1250 1251
          
          /* Fill in requested_reply variable with TRUE if this is a
           * reply and the reply was pending.
           */
          if (dbus_message_get_reply_serial (message) != 0)
1252 1253
            {
              if (proposed_recipient != NULL /* not to the bus driver */ &&
1254 1255 1256 1257 1258 1259 1260 1261 1262 1263 1264 1265 1266 1267 1268
                  addressed_recipient == proposed_recipient /* not eavesdropping */)
                {
                  DBusError error2;                  
                  
                  dbus_error_init (&error2);
                  requested_reply = bus_connections_check_reply (bus_connection_get_connections (sender),
                                                                 transaction,
                                                                 sender, addressed_recipient, message,
                                                                 &error2);
                  if (dbus_error_is_set (&error2))
                    {
                      dbus_move_error (&error2, error);
                      return FALSE;
                    }
                }
1269
            }
1270 1271 1272 1273 1274 1275
        }
      else
        {
          /* Policy for inactive connections is that they can only send
           * the hello message to the bus driver
           */
1276
          if (proposed_recipient == NULL &&
1277
              dbus_message_is_method_call (message,
1278
                                           DBUS_INTERFACE_DBUS,
1279
                                           "Hello"))
1280 1281
            {
              _dbus_verbose ("security check allowing %s message\n",
1282
                             "Hello");
1283 1284 1285 1286 1287
              return TRUE;
            }
          else
            {
              _dbus_verbose ("security check disallowing non-%s message\n",
1288
                             "Hello");
1289 1290 1291

              dbus_set_error (error, DBUS_ERROR_ACCESS_DENIED,
                              "Client tried to send a message other than %s without being registered",
1292
                              "Hello");
1293 1294 1295
              
              return FALSE;
            }
1296
        }
1297 1298
    }
  else
1299 1300 1301 1302 1303 1304 1305 1306 1307 1308
    {
      sender_policy = NULL;

      /* If the sender is the bus driver, we assume any reply was a
       * requested reply as bus driver won't send bogus ones
       */
      if (addressed_recipient == proposed_recipient /* not eavesdropping */ &&
          dbus_message_get_reply_serial (message) != 0)
        requested_reply = TRUE;
    }
1309

1310 1311 1312
  _dbus_assert ((sender != NULL && sender_policy != NULL) ||
                (sender == NULL && sender_policy == NULL));
  
1313
  if (proposed_recipient != NULL)
1314
    {
1315 1316 1317 1318
      /* only the bus driver can send to an inactive recipient (as it
       * owns no services, so other apps can't address it). Inactive
       * recipients can receive any message.
       */
1319
      if (bus_connection_is_active (proposed_recipient))
1320
        {
1321
          recipient_policy = bus_connection_get_policy (proposed_recipient);
1322 1323 1324 1325 1326 1327 1328 1329 1330 1331 1332
          _dbus_assert (recipient_policy != NULL);
        }
      else if (sender == NULL)
        {
          _dbus_verbose ("security check using NULL recipient policy for message from bus\n");
          recipient_policy = NULL;
        }
      else
        {
          _dbus_assert_not_reached ("a message was somehow sent to an inactive recipient from a source other than the message bus\n");
          recipient_policy = NULL;
1333
        }
1334 1335 1336
    }
  else
    recipient_policy = NULL;
1337
  
1338 1339 1340
  _dbus_assert ((proposed_recipient != NULL && recipient_policy != NULL) ||
                (proposed_recipient != NULL && sender == NULL && recipient_policy == NULL) ||
                (proposed_recipient == NULL && recipient_policy == NULL));
1341 1342
  
  if (sender_policy &&
1343
      !bus_client_policy_check_can_send (sender_policy,
1344 1345 1346
                                         context->registry,
                                         requested_reply,
                                         proposed_recipient,
1347
                                         message, &toggles))
1348
    {
1349
      const char *dest;
1350 1351
      const char *msg = "Rejected send message, %d matched rules; "
                        "sender=\"%s\" interface=\"%s\" member=\"%s\" error name=\"%s\" destination=\"%s\")";
1352 1353

      dest = dbus_message_get_destination (message);
1354 1355 1356
      dbus_set_error (error, DBUS_ERROR_ACCESS_DENIED, msg,
                      toggles,
                      sender_name ? sender_name : "(unset)",
1357 1358 1359 1360 1361 1362
                      dbus_message_get_interface (message) ?
                      dbus_message_get_interface (message) : "(unset)",
                      dbus_message_get_member (message) ?
                      dbus_message_get_member (message) : "(unset)",
                      dbus_message_get_error_name (message) ?
                      dbus_message_get_error_name (message) : "(unset)",
1363
                      dest ? dest : DBUS_SERVICE_DBUS);
1364 1365 1366 1367 1368 1369 1370 1371 1372 1373 1374
      /* Needs to be duplicated to avoid calling malloc and having to handle OOM */
      bus_context_log_security (context, msg,
                                toggles,
                                sender_name ? sender_name : "(unset)",
                                dbus_message_get_interface (message) ?
                                dbus_message_get_interface (message) : "(unset)",
                                dbus_message_get_member (message) ?
                                dbus_message_get_member (message) : "(unset)",
                                dbus_message_get_error_name (message) ?
                                dbus_message_get_error_name (message) : "(unset)",
                                dest ? dest : DBUS_SERVICE_DBUS);
1375
      _dbus_verbose ("security policy disallowing message due to sender policy\n");
1376 1377 1378
      return FALSE;
    }

1379
  if (recipient_policy &&
1380
      !bus_client_policy_check_can_receive (recipient_policy,
1381 1382 1383
                                            context->registry,
                                            requested_reply,
                                            sender,
1384
                                            addressed_recipient, proposed_recipient,
1385
                                            message, &toggles))
1386
    {
1387 1388
      const char *msg = "Rejected receive message, %d matched rules; "
                        "sender=\"%s\" interface=\"%s\" member=\"%s\" error name=\"%s\" destination=\"%s\" reply serial=%u requested_reply=%d)";
1389 1390 1391
      const char *dest;

      dest = dbus_message_get_destination (message);
1392 1393