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glib/gio/gdbusauthmechanism.c
Simon McVittie 32b226d1b1 gdbus: Allow cross-namespace connections to Linux session and system buses 
The dominant implementations of the well-known session and system
message buses are the reference implementation from the dbus project
(dbus-daemon) and the sd-bus-based reimplementation dbus-broker, both
of which have correct implementations for EXTERNAL authentication with
an unspecified authorization identity.

This makes it reasonably safe to assume that the well-known message
buses can cope with the unspecified authorization identity, even if we
cannot make the same assumption for custom servers such as the ones
used in ibus and gvfs (which might have been started with an older
GLib version before upgrading GLib in-place).

Signed-off-by: Simon McVittie <smcv@collabora.com>
2022-07-24 14:07:02 +01:00

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/* GDBus - GLib D-Bus Library
*
* Copyright (C) 2008-2010 Red Hat, Inc.
*
* SPDX-License-Identifier: LGPL-2.1-or-later
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General
* Public License along with this library; if not, see <http://www.gnu.org/licenses/>.
*
* Author: David Zeuthen <davidz@redhat.com>
*/
#include "config.h"
#include "gdbusauthmechanism.h"
#include "gcredentials.h"
#include "gdbuserror.h"
#include "gioenumtypes.h"
#include "giostream.h"
#include "glibintl.h"
/* ---------------------------------------------------------------------------------------------------- */
struct _GDBusAuthMechanismPrivate
{
GIOStream *stream;
GCredentials *credentials;
};
enum
{
PROP_0,
PROP_STREAM,
PROP_CREDENTIALS
};
G_DEFINE_ABSTRACT_TYPE_WITH_PRIVATE (GDBusAuthMechanism, _g_dbus_auth_mechanism, G_TYPE_OBJECT)
/* ---------------------------------------------------------------------------------------------------- */
static void
_g_dbus_auth_mechanism_finalize (GObject *object)
{
GDBusAuthMechanism *mechanism = G_DBUS_AUTH_MECHANISM (object);
if (mechanism->priv->stream != NULL)
g_object_unref (mechanism->priv->stream);
if (mechanism->priv->credentials != NULL)
g_object_unref (mechanism->priv->credentials);
G_OBJECT_CLASS (_g_dbus_auth_mechanism_parent_class)->finalize (object);
}
static void
_g_dbus_auth_mechanism_get_property (GObject *object,
guint prop_id,
GValue *value,
GParamSpec *pspec)
{
GDBusAuthMechanism *mechanism = G_DBUS_AUTH_MECHANISM (object);
switch (prop_id)
{
case PROP_STREAM:
g_value_set_object (value, mechanism->priv->stream);
break;
case PROP_CREDENTIALS:
g_value_set_object (value, mechanism->priv->credentials);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
_g_dbus_auth_mechanism_set_property (GObject *object,
guint prop_id,
const GValue *value,
GParamSpec *pspec)
{
GDBusAuthMechanism *mechanism = G_DBUS_AUTH_MECHANISM (object);
switch (prop_id)
{
case PROP_STREAM:
mechanism->priv->stream = g_value_dup_object (value);
break;
case PROP_CREDENTIALS:
mechanism->priv->credentials = g_value_dup_object (value);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
_g_dbus_auth_mechanism_class_init (GDBusAuthMechanismClass *klass)
{
GObjectClass *gobject_class;
gobject_class = G_OBJECT_CLASS (klass);
gobject_class->get_property = _g_dbus_auth_mechanism_get_property;
gobject_class->set_property = _g_dbus_auth_mechanism_set_property;
gobject_class->finalize = _g_dbus_auth_mechanism_finalize;
g_object_class_install_property (gobject_class,
PROP_STREAM,
g_param_spec_object ("stream",
P_("IO Stream"),
P_("The underlying GIOStream used for I/O"),
G_TYPE_IO_STREAM,
G_PARAM_READABLE |
G_PARAM_WRITABLE |
G_PARAM_CONSTRUCT_ONLY |
G_PARAM_STATIC_NAME |
G_PARAM_STATIC_BLURB |
G_PARAM_STATIC_NICK));
/**
* GDBusAuthMechanism:credentials:
*
* If authenticating as a server, this property contains the
* received credentials, if any.
*
* If authenticating as a client, the property contains the
* credentials that were sent, if any.
*/
g_object_class_install_property (gobject_class,
PROP_CREDENTIALS,
g_param_spec_object ("credentials",
P_("Credentials"),
P_("The credentials of the remote peer"),
G_TYPE_CREDENTIALS,
G_PARAM_READABLE |
G_PARAM_WRITABLE |
G_PARAM_CONSTRUCT_ONLY |
G_PARAM_STATIC_NAME |
G_PARAM_STATIC_BLURB |
G_PARAM_STATIC_NICK));
}
static void
_g_dbus_auth_mechanism_init (GDBusAuthMechanism *mechanism)
{
mechanism->priv = _g_dbus_auth_mechanism_get_instance_private (mechanism);
}
/* ---------------------------------------------------------------------------------------------------- */
GIOStream *
_g_dbus_auth_mechanism_get_stream (GDBusAuthMechanism *mechanism)
{
g_return_val_if_fail (G_IS_DBUS_AUTH_MECHANISM (mechanism), NULL);
return mechanism->priv->stream;
}
GCredentials *
_g_dbus_auth_mechanism_get_credentials (GDBusAuthMechanism *mechanism)
{
g_return_val_if_fail (G_IS_DBUS_AUTH_MECHANISM (mechanism), NULL);
return mechanism->priv->credentials;
}
/* ---------------------------------------------------------------------------------------------------- */
const gchar *
_g_dbus_auth_mechanism_get_name (GType mechanism_type)
{
const gchar *name;
GDBusAuthMechanismClass *klass;
g_return_val_if_fail (g_type_is_a (mechanism_type, G_TYPE_DBUS_AUTH_MECHANISM), NULL);
klass = g_type_class_ref (mechanism_type);
g_assert (klass != NULL);
name = klass->get_name ();
//g_type_class_unref (klass);
return name;
}
gint
_g_dbus_auth_mechanism_get_priority (GType mechanism_type)
{
gint priority;
GDBusAuthMechanismClass *klass;
g_return_val_if_fail (g_type_is_a (mechanism_type, G_TYPE_DBUS_AUTH_MECHANISM), 0);
klass = g_type_class_ref (mechanism_type);
g_assert (klass != NULL);
priority = klass->get_priority ();
//g_type_class_unref (klass);
return priority;
}
/* ---------------------------------------------------------------------------------------------------- */
gboolean
_g_dbus_auth_mechanism_is_supported (GDBusAuthMechanism *mechanism)
{
g_return_val_if_fail (G_IS_DBUS_AUTH_MECHANISM (mechanism), FALSE);
return G_DBUS_AUTH_MECHANISM_GET_CLASS (mechanism)->is_supported (mechanism);
}
gchar *
_g_dbus_auth_mechanism_encode_data (GDBusAuthMechanism *mechanism,
const gchar *data,
gsize data_len,
gsize *out_data_len)
{
g_return_val_if_fail (G_IS_DBUS_AUTH_MECHANISM (mechanism), NULL);
return G_DBUS_AUTH_MECHANISM_GET_CLASS (mechanism)->encode_data (mechanism, data, data_len, out_data_len);
}
gchar *
_g_dbus_auth_mechanism_decode_data (GDBusAuthMechanism *mechanism,
const gchar *data,
gsize data_len,
gsize *out_data_len)
{
g_return_val_if_fail (G_IS_DBUS_AUTH_MECHANISM (mechanism), NULL);
return G_DBUS_AUTH_MECHANISM_GET_CLASS (mechanism)->decode_data (mechanism, data, data_len, out_data_len);
}
/* ---------------------------------------------------------------------------------------------------- */
GDBusAuthMechanismState
_g_dbus_auth_mechanism_server_get_state (GDBusAuthMechanism *mechanism)
{
g_return_val_if_fail (G_IS_DBUS_AUTH_MECHANISM (mechanism), G_DBUS_AUTH_MECHANISM_STATE_INVALID);
return G_DBUS_AUTH_MECHANISM_GET_CLASS (mechanism)->server_get_state (mechanism);
}
void
_g_dbus_auth_mechanism_server_initiate (GDBusAuthMechanism *mechanism,
const gchar *initial_response,
gsize initial_response_len)
{
g_return_if_fail (G_IS_DBUS_AUTH_MECHANISM (mechanism));
G_DBUS_AUTH_MECHANISM_GET_CLASS (mechanism)->server_initiate (mechanism, initial_response, initial_response_len);
}
void
_g_dbus_auth_mechanism_server_data_receive (GDBusAuthMechanism *mechanism,
const gchar *data,
gsize data_len)
{
g_return_if_fail (G_IS_DBUS_AUTH_MECHANISM (mechanism));
G_DBUS_AUTH_MECHANISM_GET_CLASS (mechanism)->server_data_receive (mechanism, data, data_len);
}
gchar *
_g_dbus_auth_mechanism_server_data_send (GDBusAuthMechanism *mechanism,
gsize *out_data_len)
{
g_return_val_if_fail (G_IS_DBUS_AUTH_MECHANISM (mechanism), NULL);
return G_DBUS_AUTH_MECHANISM_GET_CLASS (mechanism)->server_data_send (mechanism, out_data_len);
}
gchar *
_g_dbus_auth_mechanism_server_get_reject_reason (GDBusAuthMechanism *mechanism)
{
g_return_val_if_fail (G_IS_DBUS_AUTH_MECHANISM (mechanism), NULL);
return G_DBUS_AUTH_MECHANISM_GET_CLASS (mechanism)->server_get_reject_reason (mechanism);
}
void
_g_dbus_auth_mechanism_server_shutdown (GDBusAuthMechanism *mechanism)
{
g_return_if_fail (G_IS_DBUS_AUTH_MECHANISM (mechanism));
G_DBUS_AUTH_MECHANISM_GET_CLASS (mechanism)->server_shutdown (mechanism);
}
/* ---------------------------------------------------------------------------------------------------- */
GDBusAuthMechanismState
_g_dbus_auth_mechanism_client_get_state (GDBusAuthMechanism *mechanism)
{
g_return_val_if_fail (G_IS_DBUS_AUTH_MECHANISM (mechanism), G_DBUS_AUTH_MECHANISM_STATE_INVALID);
return G_DBUS_AUTH_MECHANISM_GET_CLASS (mechanism)->client_get_state (mechanism);
}
gchar *
_g_dbus_auth_mechanism_client_initiate (GDBusAuthMechanism *mechanism,
GDBusConnectionFlags conn_flags,
gsize *out_initial_response_len)
{
g_return_val_if_fail (G_IS_DBUS_AUTH_MECHANISM (mechanism), NULL);
return G_DBUS_AUTH_MECHANISM_GET_CLASS (mechanism)->client_initiate (mechanism,
conn_flags,
out_initial_response_len);
}
void
_g_dbus_auth_mechanism_client_data_receive (GDBusAuthMechanism *mechanism,
const gchar *data,
gsize data_len)
{
g_return_if_fail (G_IS_DBUS_AUTH_MECHANISM (mechanism));
G_DBUS_AUTH_MECHANISM_GET_CLASS (mechanism)->client_data_receive (mechanism, data, data_len);
}
gchar *
_g_dbus_auth_mechanism_client_data_send (GDBusAuthMechanism *mechanism,
gsize *out_data_len)
{
g_return_val_if_fail (G_IS_DBUS_AUTH_MECHANISM (mechanism), NULL);
return G_DBUS_AUTH_MECHANISM_GET_CLASS (mechanism)->client_data_send (mechanism, out_data_len);
}
void
_g_dbus_auth_mechanism_client_shutdown (GDBusAuthMechanism *mechanism)
{
g_return_if_fail (G_IS_DBUS_AUTH_MECHANISM (mechanism));
G_DBUS_AUTH_MECHANISM_GET_CLASS (mechanism)->client_shutdown (mechanism);
}
/* ---------------------------------------------------------------------------------------------------- */
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