bus.c 34.1 KB
Newer Older
1 2 3 4 5
/* -*- mode: C; c-file-style: "gnu" -*- */
/* bus.c  message bus context object
 *
 * Copyright (C) 2003 Red Hat, Inc.
 *
6
 * Licensed under the Academic Free License version 2.0
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 33
#include <dbus/dbus-list.h>
#include <dbus/dbus-hash.h>
34 35 36 37 38
#include <dbus/dbus-internals.h>

struct BusContext
{
  int refcount;
39
  char *config_file;
40
  char *type;
41
  char *address;
42
  char *pidfile;
43
  char *user;
44
  DBusLoop *loop;
45
  DBusList *servers;
46 47 48
  BusConnections *connections;
  BusActivation *activation;
  BusRegistry *registry;
49
  BusPolicy *policy;
50
  BusMatchmaker *matchmaker;
51
  DBusUserDatabase *user_database;
52
  BusLimits limits;
53
  unsigned int fork : 1;
54 55
};

56
static dbus_int32_t server_data_slot = -1;
57 58 59 60 61 62 63 64 65 66 67 68 69 70

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;
  
71
  if (!dbus_server_allocate_data_slot (&server_data_slot))
72 73 74 75
    return NULL;

  bd = BUS_SERVER_DATA (server);
  if (bd == NULL)
76
    {
77
      dbus_server_free_data_slot (&server_data_slot);
78 79
      return NULL;
    }
80 81 82

  context = bd->context;

83
  dbus_server_free_data_slot (&server_data_slot);
84 85 86 87

  return context;
}

88
static dbus_bool_t
89 90 91 92
server_watch_callback (DBusWatch     *watch,
                       unsigned int   condition,
                       void          *data)
{
93 94 95 96 97 98
  /* 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);
99 100
}

101
static dbus_bool_t
102
add_server_watch (DBusWatch  *watch,
103
                  void       *data)
104
{
105 106 107 108 109
  DBusServer *server = data;
  BusContext *context;
  
  context = server_get_context (server);
  
110 111 112
  return _dbus_loop_add_watch (context->loop,
                               watch, server_watch_callback, server,
                               NULL);
113 114 115 116
}

static void
remove_server_watch (DBusWatch  *watch,
117
                     void       *data)
118
{
119 120 121 122 123
  DBusServer *server = data;
  BusContext *context;
  
  context = server_get_context (server);
  
124 125
  _dbus_loop_remove_watch (context->loop,
                           watch, server_watch_callback, server);
126 127
}

128

129 130 131 132
static void
server_timeout_callback (DBusTimeout   *timeout,
                         void          *data)
{
133
  /* can return FALSE on OOM but we just let it fire again later */
134 135 136 137 138
  dbus_timeout_handle (timeout);
}

static dbus_bool_t
add_server_timeout (DBusTimeout *timeout,
139
                    void        *data)
140
{
141 142 143 144 145
  DBusServer *server = data;
  BusContext *context;
  
  context = server_get_context (server);

146 147
  return _dbus_loop_add_timeout (context->loop,
                                 timeout, server_timeout_callback, server, NULL);
148 149 150 151
}

static void
remove_server_timeout (DBusTimeout *timeout,
152
                       void        *data)
153
{
154 155 156 157 158
  DBusServer *server = data;
  BusContext *context;
  
  context = server_get_context (server);
  
159 160
  _dbus_loop_remove_timeout (context->loop,
                             timeout, server_timeout_callback, server);
161 162
}

163 164 165 166 167 168 169 170
static void
new_connection_callback (DBusServer     *server,
                         DBusConnection *new_connection,
                         void           *data)
{
  BusContext *context = data;
  
  if (!bus_connections_setup_connection (context->connections, new_connection))
171 172
    {
      _dbus_verbose ("No memory to setup new connection\n");
173

174 175 176 177 178 179 180
      /* 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.
       */
      dbus_connection_disconnect (new_connection);
    }
181 182

  dbus_connection_set_max_received_size (new_connection,
183
                                         context->limits.max_incoming_bytes);
184 185

  dbus_connection_set_max_message_size (new_connection,
186
                                        context->limits.max_message_size);
187
  
188
  /* on OOM, we won't have ref'd the connection so it will die. */
189 190
}

191 192 193 194 195 196 197 198
static void
free_server_data (void *data)
{
  BusServerData *bd = data;  
  
  dbus_free (bd);
}

199 200 201
static dbus_bool_t
setup_server (BusContext *context,
              DBusServer *server,
202
              char      **auth_mechanisms,
203
              DBusError  *error)
204
{
205
  BusServerData *bd;
206 207 208 209 210 211 212 213 214 215 216 217

  bd = dbus_new0 (BusServerData, 1);
  if (!dbus_server_set_data (server,
                             server_data_slot,
                             bd, free_server_data))
    {
      dbus_free (bd);
      BUS_SET_OOM (error);
      return FALSE;
    }

  bd->context = context;
218
  
219 220 221 222 223 224
  if (!dbus_server_set_auth_mechanisms (server, (const char**) auth_mechanisms))
    {
      BUS_SET_OOM (error);
      return FALSE;
    }
  
225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248
  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;
    }
249
  
250 251 252
  return TRUE;
}

253 254 255 256 257 258 259
/* This code only gets executed the first time the
   config files are parsed.  It is not executed
   when config files are reloaded.*/
static dbus_bool_t
process_config_first_time_only (BusContext      *context,
				BusConfigParser *parser,
				DBusError       *error)
260
{
261 262
  DBusList *link;
  DBusList **addresses;
263
  const char *user, *pidfile;
264 265 266
  char **auth_mechanisms;
  DBusList **auth_mechanisms_list;
  int len;
267
  dbus_bool_t retval;
268

269
  _DBUS_ASSERT_ERROR_IS_CLEAR (error);
270

271
  retval = FALSE;
272
  auth_mechanisms = NULL;
273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297

  /* 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;
      DBusError tmp_error;
      
      dbus_error_init (&tmp_error);
      _dbus_string_init_const (&u, pidfile);
      
      if (_dbus_stat (&u, &stbuf, &tmp_error))
	{
	  dbus_set_error (error, DBUS_ERROR_FAILED,
			  "The pid file \"%s\" exists, if the message bus is not running, remove this file",
			  pidfile);
	  dbus_error_free (&tmp_error);
	  goto failed;
	}
    }
298
  
299 300
  /* keep around the pid filename so we can delete it later */
  context->pidfile = _dbus_strdup (pidfile);
301 302 303 304 305 306 307 308 309 310 311 312

  /* 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)
313 314 315 316
	{
	  BUS_SET_OOM (error);
	  goto failed;
	}
317 318 319 320 321 322 323
      
      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)
324 325 326 327
	    {
	      BUS_SET_OOM (error);
	      goto failed;
	    }
328 329 330 331 332 333 334 335 336
          link = _dbus_list_get_next_link (auth_mechanisms_list, link);
        }
    }
  else
    {
      auth_mechanisms = NULL;
    }

  /* Listen on our addresses */
337 338 339 340 341 342 343 344 345 346
  
  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)
347 348 349 350
	{
	  _DBUS_ASSERT_ERROR_IS_SET (error);
	  goto failed;
	}
351
      else if (!setup_server (context, server, auth_mechanisms, error))
352 353 354 355
	{
	  _DBUS_ASSERT_ERROR_IS_SET (error);
	  goto failed;
	}
356 357 358 359 360 361 362 363 364 365

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

366 367
  /* note that type may be NULL */
  context->type = _dbus_strdup (bus_config_parser_get_type (parser));
368 369 370 371 372
  if (bus_config_parser_get_type (parser) != NULL && context->type == NULL)
    {
      BUS_SET_OOM (error);
      goto failed;
    }
373 374 375 376 377 378 379 380 381 382 383 384 385

  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);
386
  
387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424
  _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
   are parsed: both during BusContext construction
   and on reloads. */
static dbus_bool_t
process_config_every_time (BusContext      *context,
			   BusConfigParser *parser,
			   dbus_bool_t      is_reload,
			   DBusError       *error)
{
  DBusString full_address;
  DBusList *link;
  
  dbus_bool_t retval;

  _DBUS_ASSERT_ERROR_IS_CLEAR (error);

  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);

425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447
  /* 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)
    {
      char *addr;
      
      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;
            }
        }
448

449 450 451 452 453 454 455 456 457 458 459
      if (!_dbus_string_append (&full_address, addr))
        {
          BUS_SET_OOM (error);
          goto failed;
        }

      dbus_free (addr);

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

460 461 462
  if (is_reload)
    dbus_free (context->address);

463
  if (!_dbus_string_copy_data (&full_address, &context->address))
464 465 466 467
    {
      BUS_SET_OOM (error);
      goto failed;
    }
468

469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590
  /* Create activation subsystem */
  
  if (is_reload)
    bus_activation_unref (context->activation);
  
  context->activation = bus_activation_new (context, &full_address,
                                            bus_config_parser_get_service_dirs (parser),
                                            error);
  if (context->activation == NULL)
    {
      _DBUS_ASSERT_ERROR_IS_SET (error);
      goto failed;
    }

  _DBUS_ASSERT_ERROR_IS_CLEAR (error);
  retval = TRUE;

 failed:
  _dbus_string_free (&full_address);
  return retval;
}

static dbus_bool_t
load_config (BusContext *context,
	     dbus_bool_t is_reload,
	     DBusError  *error)
{
  BusConfigParser *parser;
  DBusString config_file;
  dbus_bool_t retval;

  _DBUS_ASSERT_ERROR_IS_CLEAR (error);

  retval = FALSE;
  parser = NULL;

  _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 (!is_reload && !process_config_first_time_only (context, parser, error))
    {
      _DBUS_ASSERT_ERROR_IS_SET (error);
      goto failed;
    }

  if (!process_config_every_time (context, parser, is_reload, error))
    {
      _DBUS_ASSERT_ERROR_IS_SET (error);
      goto failed;
    }

  _DBUS_ASSERT_ERROR_IS_CLEAR (error);
  retval = TRUE;

 failed:
  if (parser)
    bus_config_parser_unref (parser);
  return retval;
}

BusContext*
bus_context_new (const DBusString *config_file,
                 dbus_bool_t       force_fork,
                 int               print_addr_fd,
                 int               print_pid_fd,
                 DBusError        *error)
{
  BusContext *context;
  
  _DBUS_ASSERT_ERROR_IS_CLEAR (error);

  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;

  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;
    }

  if (!load_config (context, FALSE, error))
    {
      _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");

  context->user_database = _dbus_user_database_new ();
  if (context->user_database == NULL)
    {
      BUS_SET_OOM (error);
      goto failed;
    }
  
591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632
  /* Note that we don't know whether the print_addr_fd is
   * 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"
   */
  if (print_addr_fd >= 0)
    {
      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);
      if (_dbus_write (print_addr_fd, &addr, 0, bytes) != bytes)
        {
          dbus_set_error (error, DBUS_ERROR_FAILED,
                          "Printing message bus address: %s\n",
                          _dbus_strerror (errno));
          _dbus_string_free (&addr);
          goto failed;
        }

      if (print_addr_fd > 2)
        _dbus_close (print_addr_fd, NULL);

      _dbus_string_free (&addr);
    }
  
633 634 635 636 637 638 639
  context->connections = bus_connections_new (context);
  if (context->connections == NULL)
    {
      BUS_SET_OOM (error);
      goto failed;
    }

640
  context->registry = bus_registry_new (context);
641 642 643 644 645
  if (context->registry == NULL)
    {
      BUS_SET_OOM (error);
      goto failed;
    }
646

647 648 649 650 651 652 653
  context->matchmaker = bus_matchmaker_new ();
  if (context->matchmaker == NULL)
    {
      BUS_SET_OOM (error);
      goto failed;
    }
  
654
  /* Now become a daemon if appropriate */
655
  if (force_fork || context->fork)
656
    {
657 658
      DBusString u;

659 660
      if (context->pidfile)
        _dbus_string_init_const (&u, context->pidfile);
661
      
662 663 664 665 666
      if (!_dbus_become_daemon (context->pidfile ? &u : NULL, error))
	{
	  _DBUS_ASSERT_ERROR_IS_SET (error);
	  goto failed;
	}
667
    }
668 669 670
  else
    {
      /* Need to write PID file for ourselves, not for the child process */
671
      if (context->pidfile != NULL)
672 673 674
        {
          DBusString u;

675
          _dbus_string_init_const (&u, context->pidfile);
676 677
          
          if (!_dbus_write_pid_file (&u, _dbus_getpid (), error))
678 679 680 681
	    {
	      _DBUS_ASSERT_ERROR_IS_SET (error);
	      goto failed;
	    }
682 683
        }
    }
684

685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720
  /* Write PID if requested */
  if (print_pid_fd >= 0)
    {
      DBusString pid;
      int bytes;

      if (!_dbus_string_init (&pid))
        {
          BUS_SET_OOM (error);
          goto failed;
        }
      
      if (!_dbus_string_append_int (&pid, _dbus_getpid ()) ||
          !_dbus_string_append (&pid, "\n"))
        {
          _dbus_string_free (&pid);
          BUS_SET_OOM (error);
          goto failed;
        }

      bytes = _dbus_string_get_length (&pid);
      if (_dbus_write (print_pid_fd, &pid, 0, bytes) != bytes)
        {
          dbus_set_error (error, DBUS_ERROR_FAILED,
                          "Printing message bus PID: %s\n",
                          _dbus_strerror (errno));
          _dbus_string_free (&pid);
          goto failed;
        }

      if (print_pid_fd > 2)
        _dbus_close (print_pid_fd, NULL);
      
      _dbus_string_free (&pid);
    }
  
721 722 723
  /* Here we change our credentials if required,
   * as soon as we've set up our sockets and pidfile
   */
724
  if (context->user != NULL)
725 726 727 728
    {
      DBusCredentials creds;
      DBusString u;

729
      _dbus_string_init_const (&u, context->user);
730 731 732 733 734 735 736

      if (!_dbus_credentials_from_username (&u, &creds) ||
          creds.uid < 0 ||
          creds.gid < 0)
        {
          dbus_set_error (error, DBUS_ERROR_FAILED,
                          "Could not get UID and GID for username \"%s\"",
737
                          context->user);
738 739 740 741
          goto failed;
        }
      
      if (!_dbus_change_identity (creds.uid, creds.gid, error))
742 743 744 745
	{
	  _DBUS_ASSERT_ERROR_IS_SET (error);
	  goto failed;
	}
746
    }
747
  
748
  dbus_server_free_data_slot (&server_data_slot);
749 750 751
  
  return context;
  
752
 failed:  
753 754 755
  if (context != NULL)
    bus_context_unref (context);

756
  dbus_server_free_data_slot (&server_data_slot);
757
  
758 759 760
  return NULL;
}

761 762 763 764 765 766 767 768 769
dbus_bool_t
bus_context_reload_config (BusContext *context,
			   DBusError  *error)
{
  return load_config (context,
		      TRUE, /* yes, we are re-loading */
		      error);
}

770 771 772
static void
shutdown_server (BusContext *context,
                 DBusServer *server)
773
{
774 775
  if (server == NULL ||
      !dbus_server_get_is_connected (server))
776 777
    return;
  
778
  if (!dbus_server_set_watch_functions (server,
779
                                        NULL, NULL, NULL,
780 781 782 783
                                        context,
                                        NULL))
    _dbus_assert_not_reached ("setting watch functions to NULL failed");
  
784
  if (!dbus_server_set_timeout_functions (server,
785
                                          NULL, NULL, NULL,
786 787 788 789
                                          context,
                                          NULL))
    _dbus_assert_not_reached ("setting timeout functions to NULL failed");
  
790 791 792 793 794 795 796 797 798 799 800 801 802 803 804
  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);
    }
805 806
}

807
BusContext *
808 809 810 811
bus_context_ref (BusContext *context)
{
  _dbus_assert (context->refcount > 0);
  context->refcount += 1;
812 813

  return context;
814 815 816 817 818 819 820 821 822 823
}

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

  if (context->refcount == 0)
    {
824 825
      DBusList *link;
      
826 827
      _dbus_verbose ("Finalizing bus context %p\n", context);
      
828
      bus_context_shutdown (context);
829 830 831 832 833 834

      if (context->connections)
        {
          bus_connections_unref (context->connections);
          context->connections = NULL;
        }
835
      
836
      if (context->registry)
837 838 839 840 841
        {
          bus_registry_unref (context->registry);
          context->registry = NULL;
        }
      
842
      if (context->activation)
843 844 845 846
        {
          bus_activation_unref (context->activation);
          context->activation = NULL;
        }
847 848 849

      link = _dbus_list_get_first_link (&context->servers);
      while (link != NULL)
850
        {
851 852 853
          dbus_server_unref (link->data);
          
          link = _dbus_list_get_next_link (&context->servers, link);
854
        }
855
      _dbus_list_clear (&context->servers);
856

857
      if (context->policy)
858
        {
859 860
          bus_policy_unref (context->policy);
          context->policy = NULL;
861
        }
862
      
863 864
      if (context->loop)
        {
865
          _dbus_loop_unref (context->loop);
866 867
          context->loop = NULL;
        }
868 869 870 871 872 873

      if (context->matchmaker)
        {
          bus_matchmaker_unref (context->matchmaker);
          context->matchmaker = NULL;
        }
874
      
875
      dbus_free (context->config_file);
876
      dbus_free (context->type);
877
      dbus_free (context->address);
878
      dbus_free (context->user);
879 880 881 882 883 884 885 886 887 888 889 890 891 892

      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); 
	}

893 894
      _dbus_user_database_unref (context->user_database);
      
895
      dbus_free (context);
896

897
      dbus_server_free_data_slot (&server_data_slot);
898 899 900
    }
}

901 902 903 904 905 906 907
/* type may be NULL */
const char*
bus_context_get_type (BusContext *context)
{
  return context->type;
}

908 909 910 911 912 913
const char*
bus_context_get_address (BusContext *context)
{
  return context->address;
}

914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930
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;
}
931

932 933 934 935 936 937
BusMatchmaker*
bus_context_get_matchmaker (BusContext  *context)
{
  return context->matchmaker;
}

938
DBusLoop*
939 940 941 942 943
bus_context_get_loop (BusContext *context)
{
  return context->loop;
}

944 945 946 947 948 949
DBusUserDatabase*
bus_context_get_user_database (BusContext *context)
{
  return context->user_database;
}

950 951 952 953
dbus_bool_t
bus_context_allow_user (BusContext   *context,
                        unsigned long uid)
{
954 955 956
  return bus_policy_allow_user (context->policy,
                                context->user_database,
                                uid);
957 958
}

959 960
BusClientPolicy*
bus_context_create_client_policy (BusContext      *context,
961 962
                                  DBusConnection  *connection,
                                  DBusError       *error)
963
{
964 965 966
  _DBUS_ASSERT_ERROR_IS_CLEAR (error);
  return bus_policy_create_client_policy (context->policy, connection,
                                          error);
967
}
968 969 970 971 972

int
bus_context_get_activation_timeout (BusContext *context)
{
  
973
  return context->limits.activation_timeout;
974
}
975

976 977 978
int
bus_context_get_auth_timeout (BusContext *context)
{
979
  return context->limits.auth_timeout;
980 981 982 983 984
}

int
bus_context_get_max_completed_connections (BusContext *context)
{
985
  return context->limits.max_completed_connections;
986 987 988 989 990
}

int
bus_context_get_max_incomplete_connections (BusContext *context)
{
991
  return context->limits.max_incomplete_connections;
992 993 994 995 996
}

int
bus_context_get_max_connections_per_user (BusContext *context)
{
997
  return context->limits.max_connections_per_user;
998 999
}

1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011
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;
}

1012 1013 1014 1015 1016 1017
int
bus_context_get_max_match_rules_per_connection (BusContext *context)
{
  return context->limits.max_match_rules_per_connection;
}

1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029
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;
}

1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042
/*
 * 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).
 */
1043 1044
dbus_bool_t
bus_context_check_security_policy (BusContext     *context,
1045
                                   BusTransaction *transaction,
1046
                                   DBusConnection *sender,
1047 1048
                                   DBusConnection *addressed_recipient,
                                   DBusConnection *proposed_recipient,
1049 1050 1051 1052 1053
                                   DBusMessage    *message,
                                   DBusError      *error)
{
  BusClientPolicy *sender_policy;
  BusClientPolicy *recipient_policy;
1054
  int type;
1055
  dbus_bool_t requested_reply;
1056 1057 1058 1059 1060
  
  type = dbus_message_get_type (message);
  
  /* dispatch.c was supposed to ensure these invariants */
  _dbus_assert (dbus_message_get_destination (message) != NULL ||
1061 1062
                type == DBUS_MESSAGE_TYPE_SIGNAL ||
                (sender == NULL && !bus_connection_is_active (proposed_recipient)));
1063 1064 1065
  _dbus_assert (type == DBUS_MESSAGE_TYPE_SIGNAL ||
                addressed_recipient != NULL ||
                strcmp (dbus_message_get_destination (message), DBUS_SERVICE_ORG_FREEDESKTOP_DBUS) == 0);
1066
  
1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 1086
  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;
  
1087 1088
  if (sender != NULL)
    {
1089
      if (bus_connection_is_active (sender))
1090
        {
1091 1092
          sender_policy = bus_connection_get_policy (sender);
          _dbus_assert (sender_policy != NULL);
1093 1094 1095 1096 1097
          
          /* 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)
1098 1099
            {
              if (proposed_recipient != NULL /* not to the bus driver */ &&
1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 1114
                  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;
                    }
                }
1115
            }
1116 1117 1118 1119 1120 1121
        }
      else
        {
          /* Policy for inactive connections is that they can only send
           * the hello message to the bus driver
           */
1122
          if (proposed_recipient == NULL &&
1123 1124 1125
              dbus_message_is_method_call (message,
                                           DBUS_INTERFACE_ORG_FREEDESKTOP_DBUS,
                                           "Hello"))
1126 1127
            {
              _dbus_verbose ("security check allowing %s message\n",
1128
                             "Hello");
1129 1130 1131 1132 1133
              return TRUE;
            }
          else
            {
              _dbus_verbose ("security check disallowing non-%s message\n",
1134
                             "Hello");
1135 1136 1137

              dbus_set_error (error, DBUS_ERROR_ACCESS_DENIED,
                              "Client tried to send a message other than %s without being registered",
1138
                              "Hello");
1139 1140 1141
              
              return FALSE;
            }
1142
        }
1143 1144
    }
  else
1145 1146 1147 1148 1149 1150 1151 1152 1153 1154
    {
      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;
    }
1155

1156 1157 1158
  _dbus_assert ((sender != NULL && sender_policy != NULL) ||
                (sender == NULL && sender_policy == NULL));
  
1159
  if (proposed_recipient != NULL)
1160
    {
1161 1162 1163 1164
      /* 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.
       */
1165
      if (bus_connection_is_active (proposed_recipient))
1166
        {
1167
          recipient_policy = bus_connection_get_policy (proposed_recipient);
1168 1169 1170 1171 1172 1173 1174 1175 1176 1177 1178
          _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;
1179
        }
1180 1181 1182
    }
  else
    recipient_policy = NULL;
1183
  
1184 1185 1186
  _dbus_assert ((proposed_recipient != NULL && recipient_policy != NULL) ||
                (proposed_recipient != NULL && sender == NULL && recipient_policy == NULL) ||
                (proposed_recipient == NULL && recipient_policy == NULL));
1187 1188
  
  if (sender_policy &&
1189
      !bus_client_policy_check_can_send (sender_policy,
1190
                                         context->registry, proposed_recipient,
1191 1192
                                         message))
    {
1193
      const char *dest = dbus_message_get_destination (message);
1194 1195 1196 1197
      dbus_set_error (error, DBUS_ERROR_ACCESS_DENIED,
                      "A security policy in place prevents this sender "
                      "from sending this message to this recipient, "
                      "see message bus configuration file (rejected message "
1198 1199 1200 1201 1202 1203 1204 1205
                      "had interface \"%s\" member \"%s\" error name \"%s\" destination \"%s\")",
                      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_ORG_FREEDESKTOP_DBUS);
1206
      _dbus_verbose ("security policy disallowing message due to sender policy\n");
1207 1208 1209
      return FALSE;
    }

1210
  if (recipient_policy &&
1211
      !bus_client_policy_check_can_receive (recipient_policy,
1212 1213 1214
                                            context->registry,
                                            requested_reply,
                                            sender,
1215
                                            addressed_recipient, proposed_recipient,
1216 1217
                                            message))
    {
1218
      const char *dest = dbus_message_get_destination (message);
1219 1220 1221 1222
      dbus_set_error (error, DBUS_ERROR_ACCESS_DENIED,
                      "A security policy in place prevents this recipient "
                      "from receiving this message from this sender, "
                      "see message bus configuration file (rejected message "
1223
                      "had interface \"%s\" member \"%s\" error name \"%s\" destination \"%s\" reply serial %u requested_reply=%d)",
1224 1225 1226 1227 1228 1229
                      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)",
1230 1231 1232
                      dest ? dest : DBUS_SERVICE_ORG_FREEDESKTOP_DBUS,
                      dbus_message_get_reply_serial (message),
                      requested_reply);
1233
      _dbus_verbose ("security policy disallowing message due to recipient policy\n");
1234 1235 1236
      return FALSE;
    }

1237
  /* See if limits on size have been exceeded */
1238 1239
  if (proposed_recipient &&
      dbus_connection_get_outgoing_size (proposed_recipient) >
1240
      context->limits.max_outgoing_bytes)
1241
    {
1242
      const char *dest = dbus_message_get_destination (message);
1243 1244
      dbus_set_error (error, DBUS_ERROR_LIMITS_EXCEEDED,
                      "The destination service \"%s\" has a full message queue",
1245 1246 1247
                      dest ? dest : (proposed_recipient ?
                                     bus_connection_get_name (proposed_recipient) : 
                                     DBUS_SERVICE_ORG_FREEDESKTOP_DBUS));
1248
      _dbus_verbose ("security policy disallowing message due to full message queue\n");
1249 1250
      return FALSE;
    }
1251

1252 1253 1254 1255 1256 1257 1258 1259 1260 1261 1262 1263 1264 1265 1266 1267 1268
  if (type == DBUS_MESSAGE_TYPE_METHOD_CALL)
    {
      /* Record that we will allow a reply here in the future (don't
       * bother if the recipient is the bus). Only the addressed recipient
       * may reply.
       */
      if (sender && addressed_recipient &&
          !bus_connections_expect_reply (bus_connection_get_connections (sender),
                                         transaction,
                                         sender, addressed_recipient,
                                         message, error))
        {
          _dbus_verbose ("Failed to record reply expectation or problem with the message expecting a reply\n");
          return FALSE;
        }
    }
  
1269
  _dbus_verbose ("security policy allowing message\n");
1270 1271
  return TRUE;
}