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// SPDX-License-Identifier: GPL-2.0-or-later
/*
*
* D-Bus helper library
*
* Copyright (C) 2004-2011 Marcel Holtmann <marcel@holtmann.org>
*
*
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <errno.h>
#include <dbus/dbus.h>
#include <glib.h>
int polkit_check_authorization(DBusConnection *conn,
const char *action, gboolean interaction,
void (*function) (dbus_bool_t authorized,
void *user_data),
void *user_data, int timeout);
static void add_dict_with_string_value(DBusMessageIter *iter,
const char *key, const char *str)
{
DBusMessageIter dict, entry, value;
dbus_message_iter_open_container(iter, DBUS_TYPE_ARRAY,
DBUS_DICT_ENTRY_BEGIN_CHAR_AS_STRING
DBUS_TYPE_STRING_AS_STRING DBUS_TYPE_VARIANT_AS_STRING
DBUS_DICT_ENTRY_END_CHAR_AS_STRING, &dict);
dbus_message_iter_open_container(&dict, DBUS_TYPE_DICT_ENTRY,
NULL, &entry);
dbus_message_iter_append_basic(&entry, DBUS_TYPE_STRING, &key);
dbus_message_iter_open_container(&entry, DBUS_TYPE_VARIANT,
DBUS_TYPE_STRING_AS_STRING, &value);
dbus_message_iter_append_basic(&value, DBUS_TYPE_STRING, &str);
dbus_message_iter_close_container(&entry, &value);
dbus_message_iter_close_container(&dict, &entry);
dbus_message_iter_close_container(iter, &dict);
}
static void add_empty_string_dict(DBusMessageIter *iter)
{
DBusMessageIter dict;
dbus_message_iter_open_container(iter, DBUS_TYPE_ARRAY,
DBUS_DICT_ENTRY_BEGIN_CHAR_AS_STRING
DBUS_TYPE_STRING_AS_STRING DBUS_TYPE_STRING_AS_STRING
DBUS_DICT_ENTRY_END_CHAR_AS_STRING, &dict);
dbus_message_iter_close_container(iter, &dict);
}
static void add_arguments(DBusConnection *conn, DBusMessageIter *iter,
const char *action, dbus_uint32_t flags)
{
const char *busname = dbus_bus_get_unique_name(conn);
const char *kind = "system-bus-name";
const char *cancel = "";
DBusMessageIter subject;
dbus_message_iter_open_container(iter, DBUS_TYPE_STRUCT,
NULL, &subject);
dbus_message_iter_append_basic(&subject, DBUS_TYPE_STRING, &kind);
add_dict_with_string_value(&subject, "name", busname);
dbus_message_iter_close_container(iter, &subject);
dbus_message_iter_append_basic(iter, DBUS_TYPE_STRING, &action);
add_empty_string_dict(iter);
dbus_message_iter_append_basic(iter, DBUS_TYPE_UINT32, &flags);
dbus_message_iter_append_basic(iter, DBUS_TYPE_STRING, &cancel);
}
static dbus_bool_t parse_result(DBusMessageIter *iter)
{
DBusMessageIter result;
dbus_bool_t authorized, challenge;
dbus_message_iter_recurse(iter, &result);
dbus_message_iter_get_basic(&result, &authorized);
dbus_message_iter_get_basic(&result, &challenge);
return authorized;
}
struct authorization_data {
void (*function) (dbus_bool_t authorized, void *user_data);
void *user_data;
};
static void authorization_reply(DBusPendingCall *call, void *user_data)
{
struct authorization_data *data = user_data;
DBusMessage *reply;
DBusMessageIter iter;
dbus_bool_t authorized = FALSE;
reply = dbus_pending_call_steal_reply(call);
if (dbus_message_get_type(reply) == DBUS_MESSAGE_TYPE_ERROR)
goto done;
if (dbus_message_has_signature(reply, "(bba{ss})") == FALSE)
goto done;
dbus_message_iter_init(reply, &iter);
authorized = parse_result(&iter);
done:
if (data->function != NULL)
data->function(authorized, data->user_data);
dbus_message_unref(reply);
dbus_pending_call_unref(call);
}
#define AUTHORITY_DBUS "org.freedesktop.PolicyKit1"
#define AUTHORITY_INTF "org.freedesktop.PolicyKit1.Authority"
#define AUTHORITY_PATH "/org/freedesktop/PolicyKit1/Authority"
int polkit_check_authorization(DBusConnection *conn,
const char *action, gboolean interaction,
void (*function) (dbus_bool_t authorized,
void *user_data),
void *user_data, int timeout)
{
struct authorization_data *data;
DBusMessage *msg;
DBusMessageIter iter;
DBusPendingCall *call;
dbus_uint32_t flags = 0x00000000;
if (conn == NULL)
return -EINVAL;
data = dbus_malloc0(sizeof(*data));
if (data == NULL)
return -ENOMEM;
msg = dbus_message_new_method_call(AUTHORITY_DBUS, AUTHORITY_PATH,
AUTHORITY_INTF, "CheckAuthorization");
if (msg == NULL) {
dbus_free(data);
return -ENOMEM;
}
if (interaction == TRUE)
flags |= 0x00000001;
if (action == NULL)
action = "org.freedesktop.policykit.exec";
dbus_message_iter_init_append(msg, &iter);
add_arguments(conn, &iter, action, flags);
if (dbus_connection_send_with_reply(conn, msg,
&call, timeout) == FALSE) {
dbus_message_unref(msg);
dbus_free(data);
return -EIO;
}
if (call == NULL) {
dbus_message_unref(msg);
dbus_free(data);
return -EIO;
}
data->function = function;
data->user_data = user_data;
dbus_pending_call_set_notify(call, authorization_reply,
data, dbus_free);
dbus_message_unref(msg);
return 0;
}
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