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/*
Authors:
Pavel Březina <pbrezina@redhat.com>
Stephen Gallagher <sgallagh@redhat.com>
Simo Sorce <ssorce@redhat.com>
Copyright (C) 2017 Red Hat
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 3 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, see <http://www.gnu.org/licenses/>.
*/
#include <errno.h>
#include <string.h>
#include <tevent.h>
#include <talloc.h>
#include <dbus/dbus.h>
#include "util/util.h"
#include "util/sss_ptr_hash.h"
#include "sbus/sbus_private.h"
static DBusHandlerResult
sbus_server_resend_message(struct sbus_server *server,
struct sbus_connection *conn,
DBusMessage *message,
const char *destination)
{
struct sbus_connection *destconn;
destconn = sbus_server_find_connection(server, destination);
if (destconn == NULL) {
DEBUG(SSSDBG_TRACE_ALL, "Trying to send a message to an unknown "
"destination: %s\n", destination);
sbus_reply_error(conn, message, DBUS_ERROR_SERVICE_UNKNOWN, destination);
return DBUS_HANDLER_RESULT_HANDLED;
}
/* Message is unreferenced by libdbus. */
dbus_connection_send(destconn->connection, message, NULL);
return DBUS_HANDLER_RESULT_HANDLED;
}
DBusHandlerResult
sbus_server_route_signal(struct sbus_server *server,
struct sbus_connection *conn,
DBusMessage *message,
const char *destination)
{
errno_t ret;
/* If a destination is set (unusual but possible) we simply send the
* signal to its desired destination. */
if (destination != NULL) {
return sbus_server_resend_message(server, conn, message, destination);
}
/* Otherwise we need to send it to all connections that listen to it. */
ret = sbus_server_matchmaker(server, conn, NULL, message);
if (ret == EOK) {
return DBUS_HANDLER_RESULT_HANDLED;
} else if (ret != ENOENT) {
DEBUG(SSSDBG_CRIT_FAILURE, "Unable to send signal [%d]: %s\n",
ret, sss_strerror(ret));
}
return DBUS_HANDLER_RESULT_NOT_YET_HANDLED;
}
static DBusHandlerResult
sbus_server_route_message(struct sbus_server *server,
struct sbus_connection *conn,
DBusMessage *message,
const char *destination)
{
if (strcmp(destination, DBUS_SERVICE_DBUS) == 0) {
/* This message is addressed to D-Bus service. We must reply to it. */
return sbus_router_filter(conn, server->router, message);
}
return sbus_server_resend_message(server, conn, message, destination);
}
static bool
sbus_server_check_access(struct sbus_connection *conn,
DBusMessage *message)
{
const char *destination;
const char *interface;
const char *member;
int type;
/* Connection must first obtain its unique name through Hello method. */
if (conn->unique_name != NULL) {
return true;
}
destination = dbus_message_get_destination(message);
interface = dbus_message_get_interface(message);
member = dbus_message_get_member(message);
type = dbus_message_get_type(message);
if (type != DBUS_MESSAGE_TYPE_METHOD_CALL) {
return false;
}
if (strcmp(destination, DBUS_SERVICE_DBUS) != 0) {
return false;
}
if (strcmp(interface, DBUS_INTERFACE_DBUS) != 0) {
return false;
}
if (strcmp(member, "Hello") != 0) {
return false;
}
return true;
}
DBusHandlerResult
sbus_server_filter(DBusConnection *dbus_conn,
DBusMessage *message,
void *handler_data)
{
struct sbus_server *server;
struct sbus_connection *conn;
const char *destination;
const char *sender;
dbus_bool_t dbret;
int type;
server = talloc_get_type(handler_data, struct sbus_server);
/* We can't really send signals when the server is being destroyed. */
if (server == NULL || server->disconnecting) {
return DBUS_HANDLER_RESULT_HANDLED;
}
conn = dbus_connection_get_data(dbus_conn, server->data_slot);
if (conn == NULL) {
DEBUG(SSSDBG_CRIT_FAILURE, "Unknown connection!\n");
return DBUS_HANDLER_RESULT_NOT_YET_HANDLED;
}
if (!sbus_server_check_access(conn, message)) {
sbus_reply_error(conn, message, DBUS_ERROR_ACCESS_DENIED,
"Connection did not call org.freedesktop.DBus.Hello");
return DBUS_HANDLER_RESULT_HANDLED;
}
/* We always require a sender but it may not be assigned yet. We prefer
* well known name if set. */
sender = sbus_connection_get_name(conn);
dbret = dbus_message_set_sender(message, sender);
if (!dbret) {
sbus_reply_error(conn, message, DBUS_ERROR_FAILED,
"Unable to set sender");
return DBUS_HANDLER_RESULT_HANDLED;
}
/* Set sender may reallocate internal fields so this needs to be read
* after we call dbus_message_set_sender(). */
destination = dbus_message_get_destination(message);
type = dbus_message_get_type(message);
if (type == DBUS_MESSAGE_TYPE_SIGNAL) {
return sbus_server_route_signal(server, conn, message, destination);
}
/* We do not allow method calls without destination. */
if (destination == NULL) {
sbus_reply_error(conn, message, DBUS_ERROR_FAILED,
"Non-signal multicast calls are not supported");
return DBUS_HANDLER_RESULT_HANDLED;
}
return sbus_server_route_message(server, conn, message, destination);
}
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