libmoonshot/libmoonshot-dbus.c

   1 /* libmoonshot - Moonshot client library
   2  * Copyright (c) 2011, JANET(UK)
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  *
   9  * 1. Redistributions of source code must retain the above copyright
  10  *    notice, this list of conditions and the following disclaimer.
  11  *
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  *
  16  * 3. Neither the name of JANET(UK) nor the names of its contributors
  17  *    may be used to endorse or promote products derived from this software
  18  *    without specific prior written permission.
  19  *
  20  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
  21  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  22  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  23  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
  24  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  25  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  26  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  27  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  28  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  29  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  30  * SUCH DAMAGE.
  31  *
  32  * Author: Sam Thursfield <samthursfield@codethink.co.uk>
  33  */
  34
  35 #include <dbus/dbus-glib.h>
  36 #include <dbus/dbus.h>
  37
  38 #include "libmoonshot.h"
  39 #include "libmoonshot-common.h"
  40
  41 #define MOONSHOT_DBUS_NAME "org.janet.Moonshot"
  42 #define MOONSHOT_DBUS_PATH "/org/janet/moonshot"
  43
  44 /* This library is overly complicated currently due to the requirement
  45  * that it work on Debian Squeeze - this has GLib 2.24 which requires us
  46  * to use dbus-glib instead of GDBus. If/when this requirement is
  47  * dropped the DBus version of the library can be greatly simplified.
  48  */
  49
  50 /* Note that ideally this library would not depend on GLib. This would be
  51  * possible using libdbus directly and running our own message loop while
  52  * waiting for calls.
  53  */
  54
  55 void moonshot_free (void *data)
  56 {
  57     g_free (data);
  58 }
  59
  60 static DBusGProxy *dbus_connect (MoonshotError **error)
  61 {
  62     DBusConnection  *connection;
  63     DBusError        dbus_error;
  64     DBusGConnection *g_connection;
  65     DBusGProxy      *g_proxy;
  66     GError          *g_error;
  67     dbus_bool_t      name_has_owner;
  68
  69     g_return_val_if_fail (*error == NULL, NULL);
  70
  71     dbus_error_init (&dbus_error);
  72
  73     /* Check for moonshot server and start the service if possible. We use
  74      * libdbus here because dbus-glib doesn't handle autostarting the service.
  75      * If/when we move to GDBus this code can become a one-liner.
  76      */
  77
  78     connection = dbus_bus_get (DBUS_BUS_SESSION, &dbus_error);
  79
  80     if (dbus_error_is_set (&dbus_error)) {
  81         *error = moonshot_error_new (MOONSHOT_ERROR_IPC_ERROR,
  82                                      "DBus error: %s",
  83                                      dbus_error.message);
  84         dbus_error_free (&dbus_error);
  85         return NULL;
  86     }
  87
  88     name_has_owner  = dbus_bus_name_has_owner (connection,
  89                                                MOONSHOT_DBUS_NAME,
  90                                                &dbus_error);
  91
  92     if (dbus_error_is_set (&dbus_error)) {
  93         *error = moonshot_error_new (MOONSHOT_ERROR_IPC_ERROR,
  94                                      "DBus error: %s",
  95                                      dbus_error.message);
  96         dbus_error_free (&dbus_error);
  97         return NULL;
  98     }
  99
 100     if (! name_has_owner) {
 101         dbus_bus_start_service_by_name (connection,
 102                                         MOONSHOT_DBUS_NAME,
 103                                         0,
 104                                         NULL,
 105                                         &dbus_error);
 106
 107         if (dbus_error_is_set (&dbus_error)) {
 108             if (strcmp (dbus_error.name + 27, "ServiceUnknown") == 0) {
 109                 /* Missing .service file; the moonshot-ui install is broken */
 110                 *error = moonshot_error_new (MOONSHOT_ERROR_UNABLE_TO_START_SERVICE,
 111                                              "The Moonshot service was not found. "
 112                                              "Please make sure that moonshot-ui is "
 113                                              "correctly installed.");
 114             } else {
 115                 *error = moonshot_error_new (MOONSHOT_ERROR_IPC_ERROR,
 116                                              "DBus error: %s",
 117                                              dbus_error.message);
 118             }
 119             dbus_error_free (&dbus_error);
 120             return NULL;
 121         }
 122     }
 123
 124     /* Now the service should be running */
 125     g_error = NULL;
 126
 127     g_connection = dbus_g_bus_get (DBUS_BUS_SESSION, &g_error);
 128
 129     if (g_error != NULL) {
 130         *error = moonshot_error_new (MOONSHOT_ERROR_IPC_ERROR,
 131                                      "DBus error: %s",
 132                                      g_error->message);
 133         g_error_free (g_error);
 134         return NULL;
 135     }
 136
 137     g_proxy = dbus_g_proxy_new_for_name_owner (g_connection,
 138                                                MOONSHOT_DBUS_NAME,
 139                                                MOONSHOT_DBUS_PATH,
 140                                                MOONSHOT_DBUS_NAME,
 141                                                &g_error);
 142
 143     if (g_error != NULL) {
 144         *error = moonshot_error_new (MOONSHOT_ERROR_IPC_ERROR,
 145                                      "DBus error: %s",
 146                                      g_error->message);
 147         g_error_free (g_error);
 148         return NULL;
 149     }
 150
 151     return g_proxy;
 152 }
 153
 154 static DBusGProxy *get_dbus_proxy (MoonshotError **error)
 155 {
 156     static DBusGProxy    *dbus_proxy = NULL;
 157     static GStaticMutex   init_lock = G_STATIC_MUTEX_INIT;
 158
 159     g_static_mutex_lock (&init_lock);
 160
 161     if (dbus_proxy == NULL) {
 162         /* Make sure GObject is initialised, in case we are the only user
 163          * of GObject in the process
 164          */
 165         g_type_init ();
 166         dbus_proxy = dbus_connect (error);
 167     }
 168
 169     if (dbus_proxy != NULL)
 170         g_object_ref (dbus_proxy);
 171
 172     g_static_mutex_unlock (&init_lock);
 173
 174     return dbus_proxy;
 175 }
 176
 177 int moonshot_get_identity (const char     *nai,
 178                            const char     *password,
 179                            const char     *service,
 180                            char          **nai_out,
 181                            char          **password_out,
 182                            char          **server_certificate_hash_out,
 183                            char          **ca_certificate_out,
 184                            char          **subject_name_constraint_out,
 185                            char          **subject_alt_name_constraint_out,
 186                            MoonshotError **error)
 187 {
 188     GError     *g_error = NULL;
 189     DBusGProxy *dbus_proxy;
 190     int         success;
 191
 192     dbus_proxy = get_dbus_proxy (error);
 193
 194     if (*error != NULL)
 195         return;
 196
 197     g_return_if_fail (DBUS_IS_G_PROXY (dbus_proxy));
 198
 199     dbus_g_proxy_call (dbus_proxy,
 200                        "GetIdentity",
 201                        &g_error,
 202                        G_TYPE_STRING, nai,
 203                        G_TYPE_STRING, password,
 204                        G_TYPE_STRING, service,
 205                        G_TYPE_INVALID,
 206                        G_TYPE_STRING, nai_out,
 207                        G_TYPE_STRING, password_out,
 208                        G_TYPE_STRING, server_certificate_hash_out,
 209                        G_TYPE_STRING, ca_certificate_out,
 210                        G_TYPE_STRING, subject_name_constraint_out,
 211                        G_TYPE_STRING, subject_alt_name_constraint_out,
 212                        G_TYPE_BOOLEAN, &success,
 213                        G_TYPE_INVALID);
 214
 215     g_object_unref (dbus_proxy);
 216
 217     if (g_error != NULL) {
 218         *error = moonshot_error_new (MOONSHOT_ERROR_IPC_ERROR,
 219                                      g_error->message);
 220         return FALSE;
 221     }
 222
 223     if (success == FALSE) {
 224         *error = moonshot_error_new (MOONSHOT_ERROR_NO_IDENTITY_SELECTED,
 225                                      "No identity was returned by the Moonshot "
 226                                      "user interface.");
 227         return FALSE;
 228     }
 229
 230     return TRUE;
 231 }
 232
 233 int moonshot_get_default_identity (char          **nai_out,
 234                                    char          **password_out,
 235                                    char          **server_certificate_hash_out,
 236                                    char          **ca_certificate_out,
 237                                    char          **subject_name_constraint_out,
 238                                    char          **subject_alt_name_constraint_out,
 239                                    MoonshotError **error)
 240 {
 241     GError     *g_error = NULL;
 242     DBusGProxy *dbus_proxy;
 243     int         success = FALSE;
 244
 245     dbus_proxy = get_dbus_proxy (error);
 246
 247     if (*error != NULL)
 248         return FALSE;
 249
 250     g_return_if_fail (DBUS_IS_G_PROXY (dbus_proxy));
 251
 252     dbus_g_proxy_call (dbus_proxy,
 253                        "GetDefaultIdentity",
 254                        &g_error,
 255                        G_TYPE_INVALID,
 256                        G_TYPE_STRING, nai_out,
 257                        G_TYPE_STRING, password_out,
 258                        G_TYPE_STRING, server_certificate_hash_out,
 259                        G_TYPE_STRING, ca_certificate_out,
 260                        G_TYPE_STRING, subject_name_constraint_out,
 261                        G_TYPE_STRING, subject_alt_name_constraint_out,
 262                        G_TYPE_BOOLEAN, &success,
 263                        G_TYPE_INVALID);
 264
 265     g_object_unref (dbus_proxy);
 266
 267     if (g_error != NULL) {
 268         *error = moonshot_error_new (MOONSHOT_ERROR_IPC_ERROR,
 269                                      g_error->message);
 270         return FALSE;
 271     }
 272
 273     if (success == FALSE) {
 274         *error = moonshot_error_new (MOONSHOT_ERROR_NO_IDENTITY_SELECTED,
 275                                      "No identity was returned by the Moonshot "
 276                                      "user interface.");
 277         return FALSE;
 278     }
 279
 280     return TRUE;
 281 }