polkit.c revision 89f134406af6a4b4c7493f624a89dcd654b48e81
/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
/***
This file is part of systemd.
Copyright 2011 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 <sys/types.h>
#include <errno.h>
#include "util.h"
#include "dbus-common.h"
#include "polkit.h"
/* This mimics dbus_bus_get_unix_user() */
static pid_t get_unix_process_id(
DBusConnection *connection,
const char *name,
DBusError *error) {
DBusMessage *m = NULL, *reply = NULL;
uint32_t pid = 0;
m = dbus_message_new_method_call(
DBUS_SERVICE_DBUS,
DBUS_PATH_DBUS,
DBUS_INTERFACE_DBUS,
"GetConnectionUnixProcessID");
if (!m) {
dbus_set_error_const(error, DBUS_ERROR_NO_MEMORY, NULL);
goto finish;
}
if (!dbus_message_append_args(
m,
DBUS_TYPE_STRING, &name,
DBUS_TYPE_INVALID)) {
dbus_set_error_const(error, DBUS_ERROR_NO_MEMORY, NULL);
goto finish;
}
reply = dbus_connection_send_with_reply_and_block(connection, m, -1, error);
if (!reply)
goto finish;
if (dbus_set_error_from_message(error, reply))
goto finish;
if (!dbus_message_get_args(
reply, error,
DBUS_TYPE_UINT32, &pid,
DBUS_TYPE_INVALID))
goto finish;
finish:
if (m)
dbus_message_unref(m);
if (reply)
dbus_message_unref(reply);
return (pid_t) pid;
}
int verify_polkit(
DBusConnection *c,
DBusMessage *request,
const char *action,
bool interactive,
bool *_challenge,
DBusError *error) {
DBusMessage *m = NULL, *reply = NULL;
const char *unix_process = "unix-process", *pid = "pid", *starttime = "start-time", *cancel_id = "";
const char *sender;
uint32_t flags = interactive ? 1 : 0;
pid_t pid_raw;
uint32_t pid_u32;
unsigned long long starttime_raw;
uint64_t starttime_u64;
DBusMessageIter iter_msg, iter_struct, iter_array, iter_dict, iter_variant;
int r;
dbus_bool_t authorized = FALSE, challenge = FALSE;
assert(c);
assert(request);
sender = dbus_message_get_sender(request);
if (!sender)
return -EINVAL;
pid_raw = get_unix_process_id(c, sender, error);
if (pid_raw == 0)
return -EINVAL;
r = get_starttime_of_pid(pid_raw, &starttime_raw);
if (r < 0)
return r;
m = dbus_message_new_method_call(
"org.freedesktop.PolicyKit1",
"/org/freedesktop/PolicyKit1/Authority",
"org.freedesktop.PolicyKit1.Authority",
"CheckAuthorization");
if (!m)
return -ENOMEM;
dbus_message_iter_init_append(m, &iter_msg);
pid_u32 = (uint32_t) pid_raw;
starttime_u64 = (uint64_t) starttime_raw;
if (!dbus_message_iter_open_container(&iter_msg, DBUS_TYPE_STRUCT, NULL, &iter_struct) ||
!dbus_message_iter_append_basic(&iter_struct, DBUS_TYPE_STRING, &unix_process) ||
!dbus_message_iter_open_container(&iter_struct, DBUS_TYPE_ARRAY, "{sv}", &iter_array) ||
!dbus_message_iter_open_container(&iter_array, DBUS_TYPE_DICT_ENTRY, NULL, &iter_dict) ||
!dbus_message_iter_append_basic(&iter_dict, DBUS_TYPE_STRING, &pid) ||
!dbus_message_iter_open_container(&iter_dict, DBUS_TYPE_VARIANT, "u", &iter_variant) ||
!dbus_message_iter_append_basic(&iter_variant, DBUS_TYPE_UINT32, &pid_u32) ||
!dbus_message_iter_close_container(&iter_dict, &iter_variant) ||
!dbus_message_iter_close_container(&iter_array, &iter_dict) ||
!dbus_message_iter_open_container(&iter_array, DBUS_TYPE_DICT_ENTRY, NULL, &iter_dict) ||
!dbus_message_iter_append_basic(&iter_dict, DBUS_TYPE_STRING, &starttime) ||
!dbus_message_iter_open_container(&iter_dict, DBUS_TYPE_VARIANT, "t", &iter_variant) ||
!dbus_message_iter_append_basic(&iter_variant, DBUS_TYPE_UINT64, &starttime_u64) ||
!dbus_message_iter_close_container(&iter_dict, &iter_variant) ||
!dbus_message_iter_close_container(&iter_array, &iter_dict) ||
!dbus_message_iter_close_container(&iter_struct, &iter_array) ||
!dbus_message_iter_close_container(&iter_msg, &iter_struct) ||
!dbus_message_iter_append_basic(&iter_msg, DBUS_TYPE_STRING, &action) ||
!dbus_message_iter_open_container(&iter_msg, DBUS_TYPE_ARRAY, "{ss}", &iter_array) ||
!dbus_message_iter_close_container(&iter_msg, &iter_array) ||
!dbus_message_iter_append_basic(&iter_msg, DBUS_TYPE_UINT32, &flags) ||
!dbus_message_iter_append_basic(&iter_msg, DBUS_TYPE_STRING, &cancel_id)) {
r = -ENOMEM;
goto finish;
}
reply = dbus_connection_send_with_reply_and_block(c, m, -1, error);
if (!reply) {
r = -EIO;
goto finish;
}
if (dbus_set_error_from_message(error, reply)) {
r = -EIO;
goto finish;
}
if (!dbus_message_iter_init(reply, &iter_msg) ||
dbus_message_iter_get_arg_type(&iter_msg) != DBUS_TYPE_STRUCT) {
r = -EIO;
goto finish;
}
dbus_message_iter_recurse(&iter_msg, &iter_struct);
if (dbus_message_iter_get_arg_type(&iter_struct) != DBUS_TYPE_BOOLEAN) {
r = -EIO;
goto finish;
}
dbus_message_iter_get_basic(&iter_struct, &authorized);
if (!dbus_message_iter_next(&iter_struct) ||
dbus_message_iter_get_arg_type(&iter_struct) != DBUS_TYPE_BOOLEAN) {
r = -EIO;
goto finish;
}
dbus_message_iter_get_basic(&iter_struct, &challenge);
if (authorized)
r = 1;
else if (_challenge) {
*_challenge = !!challenge;
r = 0;
} else
r = -EPERM;
finish:
if (m)
dbus_message_unref(m);
if (reply)
dbus_message_unref(reply);
return r;
}