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|
/* -*- mode: C; c-file-style: "gnu" -*- */
/* bus.c message bus context object
*
* Copyright (C) 2003 Red Hat, Inc.
*
* Licensed under the Academic Free License version 1.2
*
* 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"
#include "policy.h"
#include "config-parser.h"
#include <dbus/dbus-list.h>
#include <dbus/dbus-hash.h>
#include <dbus/dbus-internals.h>
struct BusContext
{
int refcount;
char *type;
char *address;
DBusLoop *loop;
DBusList *servers;
BusConnections *connections;
BusActivation *activation;
BusRegistry *registry;
DBusList *default_rules; /**< Default policy rules */
DBusList *mandatory_rules; /**< Mandatory policy rules */
DBusHashTable *rules_by_uid; /**< per-UID policy rules */
DBusHashTable *rules_by_gid; /**< per-GID policy rules */
int activation_timeout; /**< How long to wait for an activation to time out */
int auth_timeout; /**< How long to wait for an authentication to time out */
int max_completed_connections; /**< Max number of authorized connections */
int max_incomplete_connections; /**< Max number of incomplete connections */
int max_connections_per_user; /**< Max number of connections auth'd as same user */
};
static int server_data_slot = -1;
static int server_data_slot_refcount = 0;
typedef struct
{
BusContext *context;
} BusServerData;
#define BUS_SERVER_DATA(server) (dbus_server_get_data ((server), server_data_slot))
static dbus_bool_t
server_data_slot_ref (void)
{
if (server_data_slot < 0)
{
server_data_slot = dbus_server_allocate_data_slot ();
if (server_data_slot < 0)
return FALSE;
_dbus_assert (server_data_slot_refcount == 0);
}
server_data_slot_refcount += 1;
return TRUE;
}
static void
server_data_slot_unref (void)
{
_dbus_assert (server_data_slot_refcount > 0);
server_data_slot_refcount -= 1;
if (server_data_slot_refcount == 0)
{
dbus_server_free_data_slot (server_data_slot);
server_data_slot = -1;
}
}
static BusContext*
server_get_context (DBusServer *server)
{
BusContext *context;
BusServerData *bd;
if (!server_data_slot_ref ())
return NULL;
bd = BUS_SERVER_DATA (server);
if (bd == NULL)
{
server_data_slot_unref ();
return NULL;
}
context = bd->context;
server_data_slot_unref ();
return context;
}
static dbus_bool_t
server_watch_callback (DBusWatch *watch,
unsigned int condition,
void *data)
{
DBusServer *server = data;
return dbus_server_handle_watch (server, watch, condition);
}
static dbus_bool_t
add_server_watch (DBusWatch *watch,
void *data)
{
DBusServer *server = data;
BusContext *context;
context = server_get_context (server);
return _dbus_loop_add_watch (context->loop,
watch, server_watch_callback, server,
NULL);
}
static void
remove_server_watch (DBusWatch *watch,
void *data)
{
DBusServer *server = data;
BusContext *context;
context = server_get_context (server);
_dbus_loop_remove_watch (context->loop,
watch, server_watch_callback, server);
}
static void
server_timeout_callback (DBusTimeout *timeout,
void *data)
{
/* can return FALSE on OOM but we just let it fire again later */
dbus_timeout_handle (timeout);
}
static dbus_bool_t
add_server_timeout (DBusTimeout *timeout,
void *data)
{
DBusServer *server = data;
BusContext *context;
context = server_get_context (server);
return _dbus_loop_add_timeout (context->loop,
timeout, server_timeout_callback, server, NULL);
}
static void
remove_server_timeout (DBusTimeout *timeout,
void *data)
{
DBusServer *server = data;
BusContext *context;
context = server_get_context (server);
_dbus_loop_remove_timeout (context->loop,
timeout, server_timeout_callback, server);
}
static void
new_connection_callback (DBusServer *server,
DBusConnection *new_connection,
void *data)
{
BusContext *context = data;
if (!bus_connections_setup_connection (context->connections, new_connection))
{
_dbus_verbose ("No memory to setup new connection\n");
/* 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);
}
/* on OOM, we won't have ref'd the connection so it will die. */
}
static void
free_rule_func (void *data,
void *user_data)
{
BusPolicyRule *rule = data;
bus_policy_rule_unref (rule);
}
static void
free_rule_list_func (void *data)
{
DBusList **list = data;
_dbus_list_foreach (list, free_rule_func, NULL);
_dbus_list_clear (list);
dbus_free (list);
}
static void
free_server_data (void *data)
{
BusServerData *bd = data;
dbus_free (bd);
}
static dbus_bool_t
setup_server (BusContext *context,
DBusServer *server,
char **auth_mechanisms,
DBusError *error)
{
BusServerData *bd;
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;
if (!dbus_server_set_auth_mechanisms (server, (const char**) auth_mechanisms))
{
BUS_SET_OOM (error);
return FALSE;
}
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;
}
return TRUE;
}
BusContext*
bus_context_new (const DBusString *config_file,
int print_addr_fd,
DBusError *error)
{
BusContext *context;
DBusList *link;
DBusList **addresses;
BusConfigParser *parser;
DBusString full_address;
const char *user, *pidfile;
char **auth_mechanisms;
DBusList **auth_mechanisms_list;
int len;
_DBUS_ASSERT_ERROR_IS_CLEAR (error);
if (!_dbus_string_init (&full_address))
{
BUS_SET_OOM (error);
return NULL;
}
if (!server_data_slot_ref ())
{
BUS_SET_OOM (error);
_dbus_string_free (&full_address);
return NULL;
}
parser = NULL;
context = NULL;
auth_mechanisms = NULL;
parser = bus_config_load (config_file, error);
if (parser == NULL)
goto failed;
/* 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;
}
}
context = dbus_new0 (BusContext, 1);
if (context == NULL)
{
BUS_SET_OOM (error);
goto failed;
}
context->refcount = 1;
/* we need another ref of the server data slot for the context
* to own
*/
if (!server_data_slot_ref ())
_dbus_assert_not_reached ("second ref of server data slot failed");
#ifdef DBUS_BUILD_TESTS
context->activation_timeout = 6000; /* 6 seconds */
#else
context->activation_timeout = 15000; /* 15 seconds */
#endif
/* Making this long risks making a DOS attack easier, but too short
* and legitimate auth will fail. If interactive auth (ask user for
* password) is allowed, then potentially it has to be quite long.
* Ultimately it needs to come from the configuration file.
*/
context->auth_timeout = 3000; /* 3 seconds */
context->max_incomplete_connections = 32;
context->max_connections_per_user = 128;
/* Note that max_completed_connections / max_connections_per_user
* is the number of users that would have to work together to
* DOS all the other users.
*/
context->max_completed_connections = 1024;
context->loop = _dbus_loop_new ();
if (context->loop == NULL)
{
BUS_SET_OOM (error);
goto failed;
}
/* 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)
goto failed;
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)
goto failed;
link = _dbus_list_get_next_link (auth_mechanisms_list, link);
}
}
else
{
auth_mechanisms = NULL;
}
/* Listen on our addresses */
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)
goto failed;
else if (!setup_server (context, server, auth_mechanisms, error))
goto failed;
if (!_dbus_list_append (&context->servers, server))
{
BUS_SET_OOM (error);
goto failed;
}
link = _dbus_list_get_next_link (addresses, link);
}
/* Here we change our credentials if required,
* as soon as we've set up our sockets
*/
user = bus_config_parser_get_user (parser);
if (user != NULL)
{
DBusCredentials creds;
DBusString u;
_dbus_string_init_const (&u, user);
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\"",
user);
goto failed;
}
if (!_dbus_change_identity (creds.uid, creds.gid, error))
goto failed;
}
/* note that type may be NULL */
context->type = _dbus_strdup (bus_config_parser_get_type (parser));
/* 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;
}
}
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);
}
if (!_dbus_string_copy_data (&full_address, &context->address))
{
BUS_SET_OOM (error);
goto failed;
}
/* 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);
}
/* Create activation subsystem */
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;
}
context->connections = bus_connections_new (context);
if (context->connections == NULL)
{
BUS_SET_OOM (error);
goto failed;
}
context->registry = bus_registry_new (context);
if (context->registry == NULL)
{
BUS_SET_OOM (error);
goto failed;
}
context->rules_by_uid = _dbus_hash_table_new (DBUS_HASH_ULONG,
NULL,
free_rule_list_func);
if (context->rules_by_uid == NULL)
{
BUS_SET_OOM (error);
goto failed;
}
context->rules_by_gid = _dbus_hash_table_new (DBUS_HASH_ULONG,
NULL,
free_rule_list_func);
if (context->rules_by_gid == NULL)
{
BUS_SET_OOM (error);
goto failed;
}
/* Now become a daemon if appropriate */
if (bus_config_parser_get_fork (parser))
{
DBusString u;
if (pidfile)
_dbus_string_init_const (&u, pidfile);
if (!_dbus_become_daemon (pidfile ? &u : NULL, error))
goto failed;
}
else
{
/* Need to write PID file for ourselves, not for the child process */
if (pidfile != NULL)
{
DBusString u;
_dbus_string_init_const (&u, pidfile);
if (!_dbus_write_pid_file (&u, _dbus_getpid (), error))
goto failed;
}
}
bus_config_parser_unref (parser);
_dbus_string_free (&full_address);
dbus_free_string_array (auth_mechanisms);
server_data_slot_unref ();
return context;
failed:
if (parser != NULL)
bus_config_parser_unref (parser);
if (context != NULL)
bus_context_unref (context);
_dbus_string_free (&full_address);
dbus_free_string_array (auth_mechanisms);
server_data_slot_unref ();
return NULL;
}
static void
shutdown_server (BusContext *context,
DBusServer *server)
{
if (server == NULL ||
!dbus_server_get_is_connected (server))
return;
if (!dbus_server_set_watch_functions (server,
NULL, NULL, NULL,
context,
NULL))
_dbus_assert_not_reached ("setting watch functions to NULL failed");
if (!dbus_server_set_timeout_functions (server,
NULL, NULL, NULL,
context,
NULL))
_dbus_assert_not_reached ("setting timeout functions to NULL failed");
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);
}
}
void
bus_context_ref (BusContext *context)
{
_dbus_assert (context->refcount > 0);
context->refcount += 1;
}
void
bus_context_unref (BusContext *context)
{
_dbus_assert (context->refcount > 0);
context->refcount -= 1;
if (context->refcount == 0)
{
DBusList *link;
_dbus_verbose ("Finalizing bus context %p\n", context);
bus_context_shutdown (context);
if (context->connections)
{
bus_connections_unref (context->connections);
context->connections = NULL;
}
if (context->registry)
{
bus_registry_unref (context->registry);
context->registry = NULL;
}
if (context->activation)
{
bus_activation_unref (context->activation);
context->activation = NULL;
}
link = _dbus_list_get_first_link (&context->servers);
while (link != NULL)
{
dbus_server_unref (link->data);
link = _dbus_list_get_next_link (&context->servers, link);
}
_dbus_list_clear (&context->servers);
if (context->rules_by_uid)
{
_dbus_hash_table_unref (context->rules_by_uid);
context->rules_by_uid = NULL;
}
if (context->rules_by_gid)
{
_dbus_hash_table_unref (context->rules_by_gid);
context->rules_by_gid = NULL;
}
if (context->loop)
{
_dbus_loop_unref (context->loop);
context->loop = NULL;
}
dbus_free (context->type);
dbus_free (context->address);
dbus_free (context);
server_data_slot_unref ();
}
}
/* type may be NULL */
const char*
bus_context_get_type (BusContext *context)
{
return context->type;
}
const char*
bus_context_get_address (BusContext *context)
{
return context->address;
}
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;
}
DBusLoop*
bus_context_get_loop (BusContext *context)
{
return context->loop;
}
static dbus_bool_t
list_allows_user (dbus_bool_t def,
DBusList **list,
unsigned long uid,
const unsigned long *group_ids,
int n_group_ids)
{
DBusList *link;
dbus_bool_t allowed;
allowed = def;
link = _dbus_list_get_first_link (list);
while (link != NULL)
{
BusPolicyRule *rule = link->data;
link = _dbus_list_get_next_link (list, link);
if (rule->type == BUS_POLICY_RULE_USER)
{
if (rule->d.user.uid != uid)
continue;
}
else if (rule->type == BUS_POLICY_RULE_GROUP)
{
int i;
i = 0;
while (i < n_group_ids)
{
if (rule->d.group.gid == group_ids[i])
break;
++i;
}
if (i == n_group_ids)
continue;
}
else
continue;
allowed = rule->allow;
}
return allowed;
}
dbus_bool_t
bus_context_allow_user (BusContext *context,
unsigned long uid)
{
dbus_bool_t allowed;
unsigned long *group_ids;
int n_group_ids;
/* On OOM or error we always reject the user */
if (!_dbus_get_groups (uid, &group_ids, &n_group_ids))
{
_dbus_verbose ("Did not get any groups for UID %lu\n",
uid);
return FALSE;
}
allowed = FALSE;
allowed = list_allows_user (allowed,
&context->default_rules,
uid,
group_ids, n_group_ids);
allowed = list_allows_user (allowed,
&context->mandatory_rules,
uid,
group_ids, n_group_ids);
dbus_free (group_ids);
return allowed;
}
static dbus_bool_t
add_list_to_policy (DBusList **list,
BusPolicy *policy)
{
DBusList *link;
link = _dbus_list_get_first_link (list);
while (link != NULL)
{
BusPolicyRule *rule = link->data;
link = _dbus_list_get_next_link (list, link);
switch (rule->type)
{
case BUS_POLICY_RULE_USER:
case BUS_POLICY_RULE_GROUP:
/* These aren't per-connection policies */
break;
case BUS_POLICY_RULE_OWN:
case BUS_POLICY_RULE_SEND:
case BUS_POLICY_RULE_RECEIVE:
/* These are per-connection */
if (!bus_policy_append_rule (policy, rule))
return FALSE;
break;
}
}
return TRUE;
}
BusPolicy*
bus_context_create_connection_policy (BusContext *context,
DBusConnection *connection)
{
BusPolicy *policy;
unsigned long uid;
DBusList **list;
_dbus_assert (dbus_connection_get_is_authenticated (connection));
policy = bus_policy_new ();
if (policy == NULL)
return NULL;
if (!add_list_to_policy (&context->default_rules,
policy))
goto failed;
/* we avoid the overhead of looking up user's groups
* if we don't have any group rules anyway
*/
if (_dbus_hash_table_get_n_entries (context->rules_by_gid) > 0)
{
const unsigned long *groups;
int n_groups;
int i;
if (!bus_connection_get_groups (connection, &groups, &n_groups))
goto failed;
i = 0;
while (i < n_groups)
{
list = _dbus_hash_table_lookup_ulong (context->rules_by_gid,
groups[i]);
if (list != NULL)
{
if (!add_list_to_policy (list, policy))
goto failed;
}
++i;
}
}
if (!dbus_connection_get_unix_user (connection, &uid))
goto failed;
list = _dbus_hash_table_lookup_ulong (context->rules_by_uid,
uid);
if (!add_list_to_policy (list, policy))
goto failed;
if (!add_list_to_policy (&context->mandatory_rules,
policy))
goto failed;
bus_policy_optimize (policy);
return policy;
failed:
bus_policy_unref (policy);
return NULL;
}
int
bus_context_get_activation_timeout (BusContext *context)
{
return context->activation_timeout;
}
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