1 /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
4 This file is part of systemd.
6 Copyright 2010 Lennart Poettering
8 systemd is free software; you can redistribute it and/or modify it
9 under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 2 of the License, or
11 (at your option) any later version.
13 systemd is distributed in the hope that it will be useful, but
14 WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 General Public License for more details.
18 You should have received a copy of the GNU General Public License
19 along with systemd; If not, see <http://www.gnu.org/licenses/>.
23 #include <sys/socket.h>
28 #include <dbus/dbus.h>
31 #include "dbus-common.h"
35 int bus_check_peercred(DBusConnection *c) {
42 assert_se(dbus_connection_get_unix_fd(c, &fd));
44 l = sizeof(struct ucred);
45 if (getsockopt(fd, SOL_SOCKET, SO_PEERCRED, &ucred, &l) < 0) {
46 log_error("SO_PEERCRED failed: %m");
50 if (l != sizeof(struct ucred)) {
51 log_error("SO_PEERCRED returned wrong size.");
61 static int sync_auth(DBusConnection *bus, DBusError *error) {
66 /* This complexity should probably move into D-Bus itself:
68 * https://bugs.freedesktop.org/show_bug.cgi?id=35189 */
70 begin = tstamp = now(CLOCK_MONOTONIC);
73 if (tstamp > begin + DEFAULT_TIMEOUT_USEC)
76 if (dbus_connection_get_is_authenticated(bus))
79 if (!dbus_connection_read_write_dispatch(bus, ((begin + DEFAULT_TIMEOUT_USEC - tstamp) + USEC_PER_MSEC - 1) / USEC_PER_MSEC))
82 tstamp = now(CLOCK_MONOTONIC);
85 if (!dbus_connection_get_is_connected(bus)) {
86 dbus_set_error_const(error, DBUS_ERROR_NO_SERVER, "Connection terminated during authentication.");
90 if (!dbus_connection_get_is_authenticated(bus)) {
91 dbus_set_error_const(error, DBUS_ERROR_TIMEOUT, "Failed to authenticate in time.");
98 int bus_connect(DBusBusType t, DBusConnection **_bus, bool *private, DBusError *error) {
104 /* If we are root, then let's not go via the bus */
105 if (geteuid() == 0 && t == DBUS_BUS_SYSTEM) {
107 if (!(bus = dbus_connection_open_private("unix:path=/run/systemd/private", error))) {
109 dbus_error_free(error);
111 /* Retry with the pre v21 socket name, to ease upgrades */
112 if (!(bus = dbus_connection_open_private("unix:abstract=/org/freedesktop/systemd1/private", error)))
117 dbus_connection_set_exit_on_disconnect(bus, FALSE);
119 if (bus_check_peercred(bus) < 0) {
120 dbus_connection_close(bus);
121 dbus_connection_unref(bus);
123 dbus_set_error_const(error, DBUS_ERROR_ACCESS_DENIED, "Failed to verify owner of bus.");
131 if (!(bus = dbus_bus_get_private(t, error)))
134 dbus_connection_set_exit_on_disconnect(bus, FALSE);
140 if ((r = sync_auth(bus, error)) < 0) {
141 dbus_connection_close(bus);
142 dbus_connection_unref(bus);
150 int bus_connect_system_ssh(const char *user, const char *host, DBusConnection **_bus, DBusError *error) {
156 assert(user || host);
159 asprintf(&p, "exec:path=ssh,argv1=-xT,argv2=%s@%s,argv3=systemd-stdio-bridge", user, host);
161 asprintf(&p, "exec:path=ssh,argv1=-xT,argv2=%s@localhost,argv3=systemd-stdio-bridge", user);
163 asprintf(&p, "exec:path=ssh,argv1=-xT,argv2=%s,argv3=systemd-stdio-bridge", host);
166 dbus_set_error_const(error, DBUS_ERROR_NO_MEMORY, NULL);
170 bus = dbus_connection_open_private(p, error);
176 dbus_connection_set_exit_on_disconnect(bus, FALSE);
178 if ((r = sync_auth(bus, error)) < 0) {
179 dbus_connection_close(bus);
180 dbus_connection_unref(bus);
184 if (!dbus_bus_register(bus, error)) {
185 dbus_connection_close(bus);
186 dbus_connection_unref(bus);
194 int bus_connect_system_polkit(DBusConnection **_bus, DBusError *error) {
200 /* Don't bother with PolicyKit if we are root */
202 return bus_connect(DBUS_BUS_SYSTEM, _bus, NULL, error);
204 if (!(bus = dbus_connection_open_private("exec:path=pkexec,argv1=" SYSTEMD_STDIO_BRIDGE_BINARY_PATH, error)))
207 dbus_connection_set_exit_on_disconnect(bus, FALSE);
209 if ((r = sync_auth(bus, error)) < 0) {
210 dbus_connection_close(bus);
211 dbus_connection_unref(bus);
215 if (!dbus_bus_register(bus, error)) {
216 dbus_connection_close(bus);
217 dbus_connection_unref(bus);
225 const char *bus_error_message(const DBusError *error) {
228 /* Sometimes the D-Bus server is a little bit too verbose with
229 * its error messages, so let's override them here */
230 if (dbus_error_has_name(error, DBUS_ERROR_ACCESS_DENIED))
231 return "Access denied";
233 return error->message;