mirror of
https://github.com/systemd/systemd.git
synced 2024-11-07 18:27:04 +03:00
91 lines
2.5 KiB
C
91 lines
2.5 KiB
C
/*-*- Mode: C; c-basic-offset: 8 -*-*/
|
|
|
|
/***
|
|
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"
|
|
|
|
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);
|
|
|
|
/* If we are root, then let's not go via the bus */
|
|
if (geteuid() == 0 && t == DBUS_BUS_SYSTEM) {
|
|
|
|
if (!(bus = dbus_connection_open_private("unix:abstract=/org/freedesktop/systemd1/private", error)))
|
|
return -EIO;
|
|
|
|
if (bus_check_peercred(bus) < 0) {
|
|
dbus_connection_unref(bus);
|
|
|
|
dbus_set_error_const(error, DBUS_ERROR_ACCESS_DENIED, "Failed to verify owner of bus.");
|
|
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;
|
|
}
|