gio/gdbusauthobserver.c

   1 /* GDBus - GLib D-Bus Library
   2  *
   3  * Copyright (C) 2008-2010 Red Hat, Inc.
   4  *
   5  * This library is free software; you can redistribute it and/or
   6  * modify it under the terms of the GNU Lesser General Public
   7  * License as published by the Free Software Foundation; either
   8  * version 2 of the License, or (at your option) any later version.
   9  *
  10  * This library is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13  * Lesser General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU Lesser General
  16  * Public License along with this library; if not, write to the
  17  * Free Software Foundation, Inc., 59 Temple Place, Suite 330,
  18  * Boston, MA 02111-1307, USA.
  19  *
  20  * Author: David Zeuthen <davidz@redhat.com>
  21  */
  22
  23 #include "config.h"
  24
  25 #include "gdbusauthobserver.h"
  26 #include "gio-marshal.h"
  27 #include "gcredentials.h"
  28 #include "gioenumtypes.h"
  29 #include "giostream.h"
  30
  31 #include "glibintl.h"
  32 #include "gioalias.h"
  33
  34 /**
  35  * SECTION:gdbusauthobserver
  36  * @short_description: Object used for authenticating connections
  37  * @include: gio/gio.h
  38  *
  39  * The #GDBusAuthObserver type provides a mechanism for participating
  40  * in how a #GDBusServer (or a #GDBusConnection) authenticates remote
  41  * peers. Simply instantiate a #GDBusAuthObserver and connect to the
  42  * signals you are interested in. Note that new signals may be added
  43  * in the future
  44  *
  45  * For example, if you only want to allow D-Bus connections from
  46  * processes owned by the same uid as the server, you would do this:
  47  * <example id="auth-observer"><title>Controlling Authentication</title><programlisting>
  48  * static gboolean
  49  * on_authorize_authenticated_peer (GDBusAuthObserver *observer,
  50  *                                  GIOStream         *stream,
  51  *                                  GCredentials      *credentials,
  52  *                                  gpointer           user_data)
  53  * {
  54  *   GCredentials *me;
  55  *   gboolean authorized;
  56  *
  57  *   authorized = FALSE;
  58  *   me = g_credentials_new ();
  59  *
  60  *   if (credentials != NULL &&
  61  *       !g_credentials_is_same_user (credentials, me))
  62  *     authorized = TRUE;
  63  *
  64  *   g_object_unref (me);
  65  *
  66  *   return authorized;
  67  * }
  68  *
  69  * static gboolean
  70  * on_new_connection (GDBusServer     *server,
  71  *                    GDBusConnection *connection,
  72  *                    gpointer         user_data)
  73  * {
  74  *   /<!-- -->* Guaranteed here that @connection is from a process owned by the same user *<!-- -->/
  75  * }
  76  *
  77  * [...]
  78  *
  79  * GDBusAuthObserver *observer;
  80  * GDBusServer *server;
  81  * GError *error;
  82  *
  83  * error = NULL;
  84  * observer = g_dbus_auth_observer_new ();
  85  * server = g_dbus_server_new_sync ("unix:tmpdir=/tmp/my-app-name",
  86  *                                  G_DBUS_SERVER_FLAGS_NONE,
  87  *                                  observer,
  88  *                                  NULL, /<!-- -->* GCancellable *<!-- -->/
  89  *                                  &error);
  90  * g_signal_connect (observer,
  91  *                   "authorize-authenticated-peer",
  92  *                   G_CALLBACK (on_authorize_authenticated_peer),
  93  *                   NULL);
  94  * g_signal_connect (server,
  95  *                   "new-connection",
  96  *                   G_CALLBACK (on_new_connection),
  97  *                   NULL);
  98  * g_object_unref (observer);
  99  * g_dbus_server_start (server);
 100  * </programlisting></example>
 101  */
 102
 103 /**
 104  * GDBusAuthObserverClass:
 105  * @authorize_authenticated_peer: Signal class handler for the #GDBusAuthObserver::authorize-authenticated-peer signal.
 106  *
 107  * Class structure for #GDBusAuthObserverClass.
 108  *
 109  * Since: 2.26
 110  */
 111 struct _GDBusAuthObserverClass
 112 {
 113   /*< private >*/
 114   GObjectClass parent_class;
 115
 116   /*< public >*/
 117
 118   /* Signals */
 119   gboolean (*authorize_authenticated_peer) (GDBusAuthObserver  *observer,
 120                                             GIOStream          *stream,
 121                                             GCredentials       *credentials);
 122 };
 123
 124 struct _GDBusAuthObserverPrivate
 125 {
 126   gint foo;
 127 };
 128
 129 enum
 130 {
 131   AUTHORIZE_AUTHENTICATED_PEER_SIGNAL,
 132   LAST_SIGNAL,
 133 };
 134
 135 static guint signals[LAST_SIGNAL] = { 0 };
 136
 137 G_DEFINE_TYPE (GDBusAuthObserver, g_dbus_auth_observer, G_TYPE_OBJECT);
 138
 139 /* ---------------------------------------------------------------------------------------------------- */
 140
 141 static void
 142 g_dbus_auth_observer_finalize (GObject *object)
 143 {
 144   G_OBJECT_CLASS (g_dbus_auth_observer_parent_class)->finalize (object);
 145 }
 146
 147 static gboolean
 148 g_dbus_auth_observer_authorize_authenticated_peer_real (GDBusAuthObserver  *observer,
 149                                                         GIOStream          *stream,
 150                                                         GCredentials       *credentials)
 151 {
 152   return TRUE;
 153 }
 154
 155 gboolean
 156 _g_signal_accumulator_false_handled (GSignalInvocationHint *ihint,
 157                                      GValue                *return_accu,
 158                                      const GValue          *handler_return,
 159                                      gpointer               dummy)
 160 {
 161   gboolean continue_emission;
 162   gboolean signal_handled;
 163
 164   signal_handled = g_value_get_boolean (handler_return);
 165   g_value_set_boolean (return_accu, signal_handled);
 166   continue_emission = signal_handled;
 167
 168   return continue_emission;
 169 }
 170
 171 static void
 172 g_dbus_auth_observer_class_init (GDBusAuthObserverClass *klass)
 173 {
 174   GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
 175
 176   gobject_class->finalize = g_dbus_auth_observer_finalize;
 177
 178   klass->authorize_authenticated_peer = g_dbus_auth_observer_authorize_authenticated_peer_real;
 179
 180   /**
 181    * GDBusAuthObserver::authorize-authenticated-peer:
 182    * @observer: The #GDBusAuthObserver emitting the signal.
 183    * @stream: A #GIOStream for the #GDBusConnection.
 184    * @credentials: Credentials received from the peer or %NULL.
 185    *
 186    * Emitted to check if a peer that is successfully authenticated
 187    * is authorized.
 188    *
 189    * Returns: %TRUE if the peer is authorized, %FALSE if not.
 190    *
 191    * Since: 2.26
 192    */
 193   signals[AUTHORIZE_AUTHENTICATED_PEER_SIGNAL] =
 194     g_signal_new ("authorize-authenticated-peer",
 195                   G_TYPE_DBUS_AUTH_OBSERVER,
 196                   G_SIGNAL_RUN_LAST,
 197                   G_STRUCT_OFFSET (GDBusAuthObserverClass, authorize_authenticated_peer),
 198                   _g_signal_accumulator_false_handled,
 199                   NULL, /* accu_data */
 200                   _gio_marshal_BOOLEAN__OBJECT_OBJECT,
 201                   G_TYPE_BOOLEAN,
 202                   2,
 203                   G_TYPE_IO_STREAM,
 204                   G_TYPE_CREDENTIALS);
 205
 206
 207   g_type_class_add_private (klass, sizeof (GDBusAuthObserverPrivate));
 208 }
 209
 210 static void
 211 g_dbus_auth_observer_init (GDBusAuthObserver *observer)
 212 {
 213   /* not used for now */
 214   observer->priv = G_TYPE_INSTANCE_GET_PRIVATE (observer,
 215                                                 G_TYPE_DBUS_AUTH_OBSERVER,
 216                                                 GDBusAuthObserverPrivate);
 217 }
 218
 219 /**
 220  * g_dbus_auth_observer_new:
 221  *
 222  * Creates a new #GDBusAuthObserver object.
 223  *
 224  * Returns: A #GDBusAuthObserver. Free with g_object_unref().
 225  *
 226  * Since: 2.26
 227  */
 228 GDBusAuthObserver *
 229 g_dbus_auth_observer_new (void)
 230 {
 231   return g_object_new (G_TYPE_DBUS_AUTH_OBSERVER, NULL);
 232 }
 233
 234 /* ---------------------------------------------------------------------------------------------------- */
 235
 236 /**
 237  * g_dbus_auth_observer_authorize_authenticated_peer:
 238  * @observer: A #GDBusAuthObserver.
 239  * @stream: A #GIOStream for the #GDBusConnection.
 240  * @credentials: Credentials received from the peer or %NULL.
 241  *
 242  * Emits the #GDBusAuthObserver::authorize-authenticated-peer signal on @observer.
 243  *
 244  * Returns: %TRUE if the peer should be denied, %FALSE otherwise.
 245  *
 246  * Since: 2.26
 247  */
 248 gboolean
 249 g_dbus_auth_observer_authorize_authenticated_peer (GDBusAuthObserver  *observer,
 250                                                    GIOStream          *stream,
 251                                                    GCredentials       *credentials)
 252 {
 253   gboolean denied;
 254
 255   denied = FALSE;
 256   g_signal_emit (observer,
 257                  signals[AUTHORIZE_AUTHENTICATED_PEER_SIGNAL],
 258                  0,
 259                  stream,
 260                  credentials,
 261                  &denied);
 262   return denied;
 263 }
 264
 265
 266
 267 #define __G_DBUS_AUTH_OBSERVER_C__
 268 #include "gioaliasdef.c"