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/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
/***
This file is part of systemd.
Copyright 2010 Lennart Poettering
systemd 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.
systemd 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 systemd; If not, see <http://www.gnu.org/licenses/>.
***/
#include <assert.h>
#include <sys/socket.h>
#include <errno.h>
#include <unistd.h>
#include <dbus/dbus.h>
#include "log.h"
#include "dbus-common.h"
#include "util.h"
int bus_check_peercred(DBusConnection *c) {
int fd;
struct ucred ucred;
socklen_t l;
assert(c);
assert_se(dbus_connection_get_unix_fd(c, &fd));
l = sizeof(struct ucred);
if (getsockopt(fd, SOL_SOCKET, SO_PEERCRED, &ucred, &l) < 0) {
log_error("SO_PEERCRED failed: %m");
return -errno;
}
if (l != sizeof(struct ucred)) {
log_error("SO_PEERCRED returned wrong size.");
return -E2BIG;
}
if (ucred.uid != 0)
return -EPERM;
return 1;
}
int bus_connect(DBusBusType t, DBusConnection **_bus, bool *private, DBusError *error) {
DBusConnection *bus;
assert(_bus);
#define TIMEOUT_USEC (60*USEC_PER_SEC)
/* If we are root, then let's not go via the bus */
if (geteuid() == 0 && t == DBUS_BUS_SYSTEM) {
usec_t begin, tstamp;
if (!(bus = dbus_connection_open_private("unix:abstract=/org/freedesktop/systemd1/private", error)))
return -EIO;
if (bus_check_peercred(bus) < 0) {
dbus_connection_close(bus);
dbus_connection_unref(bus);
dbus_set_error_const(error, DBUS_ERROR_ACCESS_DENIED, "Failed to verify owner of bus.");
return -EACCES;
}
/* This complexity should probably move into D-Bus itself:
*
* https://bugs.freedesktop.org/show_bug.cgi?id=35189 */
begin = tstamp = now(CLOCK_MONOTONIC);
for (;;) {
if (tstamp > begin + TIMEOUT_USEC)
break;
if (dbus_connection_get_is_authenticated(bus))
break;
if (!dbus_connection_read_write_dispatch(bus, ((begin + TIMEOUT_USEC - tstamp) + USEC_PER_MSEC - 1) / USEC_PER_MSEC))
break;
tstamp = now(CLOCK_MONOTONIC);
}
if (!dbus_connection_get_is_connected(bus)) {
dbus_connection_close(bus);
dbus_connection_unref(bus);
dbus_set_error_const(error, DBUS_ERROR_NO_SERVER, "Connection terminated during authentication.");
return -ECONNREFUSED;
}
if (!dbus_connection_get_is_authenticated(bus)) {
dbus_connection_close(bus);
dbus_connection_unref(bus);
dbus_set_error_const(error, DBUS_ERROR_TIMEOUT, "Failed to authenticate in time.");
return -EACCES;
}
if (private)
*private = true;
} else {
if (!(bus = dbus_bus_get_private(t, error)))
return -EIO;
if (private)
*private = false;
}
dbus_connection_set_exit_on_disconnect(bus, FALSE);
*_bus = bus;
return 0;
}
const char *bus_error_message(const DBusError *error) {
assert(error);
/* Sometimes the D-Bus server is a little bit too verbose with
* its error messages, so let's override them here */
if (dbus_error_has_name(error, DBUS_ERROR_ACCESS_DENIED))
return "Access denied";
return error->message;
}
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