tls/gnutls/gtlsconnection-gnutls.c

   1 /* GIO - GLib Input, Output and Streaming Library
   2  *
   3  * Copyright © 2009 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
  21 #include "config.h"
  22 #include "glib.h"
  23
  24 #include <errno.h>
  25 #include <gnutls/gnutls.h>
  26 #include <gnutls/x509.h>
  27
  28 #include "gtlsconnection-gnutls.h"
  29 #include "gtlsbackend-gnutls.h"
  30 #include "gtlscertificate-gnutls.h"
  31 #include "gtlsinputstream-gnutls.h"
  32 #include "gtlsoutputstream-gnutls.h"
  33 #include "gtlsserverconnection-gnutls.h"
  34 #include "gnutls-marshal.h"
  35 #include <glib/gi18n-lib.h>
  36
  37 static void g_tls_connection_gnutls_get_property (GObject    *object,
  38                                                   guint       prop_id,
  39                                                   GValue     *value,
  40                                                   GParamSpec *pspec);
  41 static void g_tls_connection_gnutls_set_property (GObject      *object,
  42                                                   guint         prop_id,
  43                                                   const GValue *value,
  44                                                   GParamSpec   *pspec);
  45 static void g_tls_connection_gnutls_finalize     (GObject      *object);
  46
  47 static gboolean     g_tls_connection_gnutls_handshake        (GTlsConnection       *connection,
  48                                                               GCancellable         *cancellable,
  49                                                               GError              **error);
  50 static void         g_tls_connection_gnutls_handshake_async  (GTlsConnection       *conn,
  51                                                               int                   io_priority,
  52                                                               GCancellable         *cancellable,
  53                                                               GAsyncReadyCallback   callback,
  54                                                               gpointer              user_data);
  55 static gboolean     g_tls_connection_gnutls_handshake_finish (GTlsConnection       *conn,
  56                                                               GAsyncResult         *result,
  57                                                               GError              **error);
  58
  59 static GInputStream  *g_tls_connection_gnutls_get_input_stream  (GIOStream *stream);
  60 static GOutputStream *g_tls_connection_gnutls_get_output_stream (GIOStream *stream);
  61
  62 static gboolean     g_tls_connection_gnutls_close        (GIOStream           *stream,
  63                                                           GCancellable        *cancellable,
  64                                                           GError             **error);
  65 static void         g_tls_connection_gnutls_close_async  (GIOStream           *stream,
  66                                                           int                  io_priority,
  67                                                           GCancellable        *cancellable,
  68                                                           GAsyncReadyCallback  callback,
  69                                                           gpointer             user_data);
  70 static gboolean     g_tls_connection_gnutls_close_finish (GIOStream           *stream,
  71                                                           GAsyncResult        *result,
  72                                                           GError             **error);
  73
  74 static ssize_t g_tls_connection_gnutls_push_func (gnutls_transport_ptr_t  transport_data,
  75                                                   const void             *buf,
  76                                                   size_t                  buflen);
  77 static ssize_t g_tls_connection_gnutls_pull_func (gnutls_transport_ptr_t  transport_data,
  78                                                   void                   *buf,
  79                                                   size_t                  buflen);
  80
  81 static void     g_tls_connection_gnutls_initable_iface_init (GInitableIface  *iface);
  82 static gboolean g_tls_connection_gnutls_initable_init       (GInitable       *initable,
  83                                                              GCancellable    *cancellable,
  84                                                              GError         **error);
  85
  86 static void g_tls_connection_gnutls_init_priorities (void);
  87
  88 G_DEFINE_ABSTRACT_TYPE_WITH_CODE (GTlsConnectionGnutls, g_tls_connection_gnutls, G_TYPE_TLS_CONNECTION,
  89                                   G_IMPLEMENT_INTERFACE (G_TYPE_INITABLE,
  90                                                          g_tls_connection_gnutls_initable_iface_init);
  91                                   g_tls_connection_gnutls_init_priorities ();
  92                                   );
  93
  94
  95 enum
  96 {
  97   PROP_0,
  98   PROP_BASE_IO_STREAM,
  99   PROP_REQUIRE_CLOSE_NOTIFY,
 100   PROP_REHANDSHAKE_MODE,
 101   PROP_USE_SYSTEM_CERTDB,
 102   PROP_CERTIFICATE,
 103   PROP_PEER_CERTIFICATE,
 104   PROP_PEER_CERTIFICATE_ERRORS
 105 };
 106
 107 struct _GTlsConnectionGnutlsPrivate
 108 {
 109   GIOStream *base_io_stream;
 110   GPollableInputStream *base_istream;
 111   GPollableOutputStream *base_ostream;
 112
 113   GList *ca_list;
 114   gnutls_certificate_credentials creds;
 115   gnutls_session session;
 116
 117   GTlsCertificate *certificate, *peer_certificate;
 118   GTlsCertificateFlags peer_certificate_errors;
 119   gboolean require_close_notify;
 120   GTlsRehandshakeMode rehandshake_mode;
 121   gboolean use_system_certdb;
 122   gboolean need_handshake, handshaking, ever_handshaked;
 123   gboolean closing;
 124
 125   GInputStream *tls_istream;
 126   GOutputStream *tls_ostream;
 127
 128   GError *error;
 129   GCancellable *cancellable;
 130   gboolean blocking, eof;
 131   GIOCondition internal_direction;
 132 };
 133
 134 static void
 135 g_tls_connection_gnutls_class_init (GTlsConnectionGnutlsClass *klass)
 136 {
 137   GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
 138   GTlsConnectionClass *connection_class = G_TLS_CONNECTION_CLASS (klass);
 139   GIOStreamClass *iostream_class = G_IO_STREAM_CLASS (klass);
 140
 141   g_type_class_add_private (klass, sizeof (GTlsConnectionGnutlsPrivate));
 142
 143   gobject_class->get_property = g_tls_connection_gnutls_get_property;
 144   gobject_class->set_property = g_tls_connection_gnutls_set_property;
 145   gobject_class->finalize     = g_tls_connection_gnutls_finalize;
 146
 147   connection_class->handshake        = g_tls_connection_gnutls_handshake;
 148   connection_class->handshake_async  = g_tls_connection_gnutls_handshake_async;
 149   connection_class->handshake_finish = g_tls_connection_gnutls_handshake_finish;
 150
 151   iostream_class->get_input_stream  = g_tls_connection_gnutls_get_input_stream;
 152   iostream_class->get_output_stream = g_tls_connection_gnutls_get_output_stream;
 153   iostream_class->close_fn          = g_tls_connection_gnutls_close;
 154   iostream_class->close_async       = g_tls_connection_gnutls_close_async;
 155   iostream_class->close_finish      = g_tls_connection_gnutls_close_finish;
 156
 157   g_object_class_override_property (gobject_class, PROP_BASE_IO_STREAM, "base-io-stream");
 158   g_object_class_override_property (gobject_class, PROP_REQUIRE_CLOSE_NOTIFY, "require-close-notify");
 159   g_object_class_override_property (gobject_class, PROP_REHANDSHAKE_MODE, "rehandshake-mode");
 160   g_object_class_override_property (gobject_class, PROP_USE_SYSTEM_CERTDB, "use-system-certdb");
 161   g_object_class_override_property (gobject_class, PROP_CERTIFICATE, "certificate");
 162   g_object_class_override_property (gobject_class, PROP_PEER_CERTIFICATE, "peer-certificate");
 163   g_object_class_override_property (gobject_class, PROP_PEER_CERTIFICATE_ERRORS, "peer-certificate-errors");
 164 }
 165
 166 static void
 167 g_tls_connection_gnutls_initable_iface_init (GInitableIface *iface)
 168 {
 169   iface->init = g_tls_connection_gnutls_initable_init;
 170 }
 171
 172 static void
 173 g_tls_connection_gnutls_init (GTlsConnectionGnutls *gnutls)
 174 {
 175   gnutls->priv = G_TYPE_INSTANCE_GET_PRIVATE (gnutls, G_TYPE_TLS_CONNECTION_GNUTLS, GTlsConnectionGnutlsPrivate);
 176
 177   gnutls_certificate_allocate_credentials (&gnutls->priv->creds);
 178   gnutls_certificate_set_verify_flags (gnutls->priv->creds,
 179                                        GNUTLS_VERIFY_ALLOW_X509_V1_CA_CRT);
 180
 181   gnutls->priv->need_handshake = TRUE;
 182 }
 183
 184 static gnutls_priority_t priorities[2][2];
 185
 186 static void
 187 g_tls_connection_gnutls_init_priorities (void)
 188 {
 189   /* First field is "ssl3 only", second is "allow unsafe rehandshaking" */
 190
 191   gnutls_priority_init (&priorities[FALSE][FALSE],
 192                         "NORMAL",
 193                         NULL);
 194   gnutls_priority_init (&priorities[TRUE][FALSE],
 195                         "NORMAL:!VERS-TLS1.2:!VERS-TLS1.1:!VERS-TLS1.0",
 196                         NULL);
 197   gnutls_priority_init (&priorities[FALSE][TRUE],
 198                         "NORMAL:%UNSAFE_RENEGOTIATION",
 199                         NULL);
 200   gnutls_priority_init (&priorities[TRUE][TRUE],
 201                         "NORMAL:!VERS-TLS1.2:!VERS-TLS1.1:!VERS-TLS1.0:%UNSAFE_RENEGOTIATION",
 202                         NULL);
 203 }
 204
 205 static void
 206 g_tls_connection_gnutls_set_handshake_priority (GTlsConnectionGnutls *gnutls)
 207 {
 208   gboolean use_ssl3, unsafe_rehandshake;
 209
 210   if (G_IS_TLS_CLIENT_CONNECTION (gnutls))
 211     use_ssl3 = g_tls_client_connection_get_use_ssl3 (G_TLS_CLIENT_CONNECTION (gnutls));
 212   else
 213     use_ssl3 = FALSE;
 214   unsafe_rehandshake = (gnutls->priv->rehandshake_mode == G_TLS_REHANDSHAKE_UNSAFELY);
 215   gnutls_priority_set (gnutls->priv->session,
 216                        priorities[use_ssl3][unsafe_rehandshake]);
 217 }
 218
 219 static gboolean
 220 g_tls_connection_gnutls_initable_init (GInitable     *initable,
 221                                        GCancellable  *cancellable,
 222                                        GError       **error)
 223 {
 224   GTlsConnectionGnutls *gnutls = G_TLS_CONNECTION_GNUTLS (initable);
 225   int status;
 226
 227   g_return_val_if_fail (gnutls->priv->base_istream != NULL &&
 228                         gnutls->priv->base_ostream != NULL, FALSE);
 229
 230   /* Make sure gnutls->priv->session has been initialized (it may have
 231    * already been initialized by a construct-time property setter).
 232    */
 233   g_tls_connection_gnutls_get_session (gnutls);
 234
 235   status = gnutls_credentials_set (gnutls->priv->session,
 236                                    GNUTLS_CRD_CERTIFICATE,
 237                                    gnutls->priv->creds);
 238   if (status != 0)
 239     {
 240       g_set_error (error, G_TLS_ERROR, G_TLS_ERROR_MISC,
 241                    _("Could not create TLS connection: %s"),
 242                    gnutls_strerror (status));
 243       return FALSE;
 244     }
 245
 246   gnutls_transport_set_push_function (gnutls->priv->session,
 247                                       g_tls_connection_gnutls_push_func);
 248   gnutls_transport_set_pull_function (gnutls->priv->session,
 249                                       g_tls_connection_gnutls_pull_func);
 250   gnutls_transport_set_ptr (gnutls->priv->session, gnutls);
 251
 252   gnutls->priv->tls_istream = g_tls_input_stream_gnutls_new (gnutls);
 253   gnutls->priv->tls_ostream = g_tls_output_stream_gnutls_new (gnutls);
 254
 255   return TRUE;
 256 }
 257
 258 static void
 259 g_tls_connection_gnutls_finalize (GObject *object)
 260 {
 261   GTlsConnectionGnutls *connection = G_TLS_CONNECTION_GNUTLS (object);
 262
 263   if (connection->priv->base_io_stream)
 264     g_object_unref (connection->priv->base_io_stream);
 265
 266   if (connection->priv->session)
 267     gnutls_deinit (connection->priv->session);
 268
 269   if (connection->priv->tls_istream)
 270     g_object_unref (connection->priv->tls_istream);
 271   if (connection->priv->tls_ostream)
 272     g_object_unref (connection->priv->tls_ostream);
 273
 274   if (connection->priv->creds)
 275     gnutls_certificate_free_credentials (connection->priv->creds);
 276
 277   if (connection->priv->certificate)
 278     g_object_unref (connection->priv->certificate);
 279   if (connection->priv->peer_certificate)
 280     g_object_unref (connection->priv->peer_certificate);
 281
 282   if (connection->priv->error)
 283     g_error_free (connection->priv->error);
 284
 285   G_OBJECT_CLASS (g_tls_connection_gnutls_parent_class)->finalize (object);
 286 }
 287
 288 static void
 289 g_tls_connection_gnutls_get_property (GObject    *object,
 290                                       guint       prop_id,
 291                                       GValue     *value,
 292                                       GParamSpec *pspec)
 293 {
 294   GTlsConnectionGnutls *gnutls = G_TLS_CONNECTION_GNUTLS (object);
 295
 296   switch (prop_id)
 297     {
 298     case PROP_BASE_IO_STREAM:
 299       g_value_set_object (value, gnutls->priv->base_io_stream);
 300       break;
 301
 302     case PROP_REQUIRE_CLOSE_NOTIFY:
 303       g_value_set_boolean (value, gnutls->priv->require_close_notify);
 304       break;
 305
 306     case PROP_REHANDSHAKE_MODE:
 307       g_value_set_enum (value, gnutls->priv->rehandshake_mode);
 308       break;
 309
 310     case PROP_USE_SYSTEM_CERTDB:
 311       g_value_set_boolean (value, gnutls->priv->use_system_certdb);
 312       break;
 313
 314     case PROP_CERTIFICATE:
 315       g_value_set_object (value, gnutls->priv->certificate);
 316       break;
 317
 318     case PROP_PEER_CERTIFICATE:
 319       g_value_set_object (value, gnutls->priv->peer_certificate);
 320       break;
 321
 322     case PROP_PEER_CERTIFICATE_ERRORS:
 323       g_value_set_flags (value, gnutls->priv->peer_certificate_errors);
 324       break;
 325
 326     default:
 327       G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
 328     }
 329 }
 330
 331 static void
 332 g_tls_connection_gnutls_set_property (GObject      *object,
 333                                       guint         prop_id,
 334                                       const GValue *value,
 335                                       GParamSpec   *pspec)
 336 {
 337   GTlsConnectionGnutls *gnutls = G_TLS_CONNECTION_GNUTLS (object);
 338   GInputStream *istream;
 339   GOutputStream *ostream;
 340
 341   switch (prop_id)
 342     {
 343     case PROP_BASE_IO_STREAM:
 344       if (gnutls->priv->base_io_stream)
 345         {
 346           g_object_unref (gnutls->priv->base_io_stream);
 347           gnutls->priv->base_istream = NULL;
 348           gnutls->priv->base_ostream = NULL;
 349         }
 350       gnutls->priv->base_io_stream = g_value_dup_object (value);
 351       if (!gnutls->priv->base_io_stream)
 352         return;
 353
 354       istream = g_io_stream_get_input_stream (gnutls->priv->base_io_stream);
 355       ostream = g_io_stream_get_output_stream (gnutls->priv->base_io_stream);
 356
 357       if (G_IS_POLLABLE_INPUT_STREAM (istream) &&
 358           g_pollable_input_stream_can_poll (G_POLLABLE_INPUT_STREAM (istream)))
 359         gnutls->priv->base_istream = G_POLLABLE_INPUT_STREAM (istream);
 360       if (G_IS_POLLABLE_OUTPUT_STREAM (ostream) &&
 361           g_pollable_output_stream_can_poll (G_POLLABLE_OUTPUT_STREAM (ostream)))
 362         gnutls->priv->base_ostream = G_POLLABLE_OUTPUT_STREAM (ostream);
 363       break;
 364
 365     case PROP_REQUIRE_CLOSE_NOTIFY:
 366       gnutls->priv->require_close_notify = g_value_get_boolean (value);
 367       break;
 368
 369     case PROP_REHANDSHAKE_MODE:
 370       gnutls->priv->rehandshake_mode = g_value_get_enum (value);
 371       break;
 372
 373     case PROP_USE_SYSTEM_CERTDB:
 374       gnutls->priv->use_system_certdb = g_value_get_boolean (value);
 375
 376       gnutls_certificate_free_cas (gnutls->priv->creds);
 377       if (gnutls->priv->use_system_certdb)
 378         {
 379           gnutls_x509_crt_t *cas;
 380           int num_cas;
 381
 382           g_tls_backend_gnutls_get_system_ca_list_gnutls (&cas, &num_cas);
 383           gnutls_certificate_set_x509_trust (gnutls->priv->creds, cas, num_cas);
 384         }
 385       break;
 386
 387     case PROP_CERTIFICATE:
 388       if (gnutls->priv->certificate)
 389         g_object_unref (gnutls->priv->certificate);
 390       gnutls->priv->certificate = g_value_dup_object (value);
 391       break;
 392
 393     default:
 394       G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
 395     }
 396 }
 397
 398 gnutls_certificate_credentials
 399 g_tls_connection_gnutls_get_credentials (GTlsConnectionGnutls *gnutls)
 400 {
 401   return gnutls->priv->creds;
 402 }
 403
 404 gnutls_session
 405 g_tls_connection_gnutls_get_session (GTlsConnectionGnutls *gnutls)
 406 {
 407   /* Ideally we would initialize gnutls->priv->session from
 408    * g_tls_connection_gnutls_init(), but we can't tell if it's a
 409    * client or server connection at that point... And
 410    * g_tls_connection_gnutls_initiable_init() is too late, because
 411    * construct-time property setters may need to modify it.
 412    */
 413   if (!gnutls->priv->session)
 414     {
 415       gboolean client = G_IS_TLS_CLIENT_CONNECTION (gnutls);
 416       gnutls_init (&gnutls->priv->session, client ? GNUTLS_CLIENT : GNUTLS_SERVER);
 417     }
 418
 419   return gnutls->priv->session;
 420 }
 421
 422 void
 423 g_tls_connection_gnutls_get_certificate (GTlsConnectionGnutls *gnutls,
 424                                          gnutls_retr_st       *st)
 425 {
 426   GTlsCertificate *cert;
 427
 428   cert = g_tls_connection_get_certificate (G_TLS_CONNECTION (gnutls));
 429
 430   st->type = GNUTLS_CRT_X509;
 431   if (cert)
 432     {
 433       GTlsCertificateGnutls *gnutlscert = G_TLS_CERTIFICATE_GNUTLS (cert);
 434
 435       st->ncerts = 1;
 436       st->cert.x509 = gnutls_malloc (sizeof (gnutls_x509_crt_t));
 437       st->cert.x509[0] = g_tls_certificate_gnutls_copy_cert (gnutlscert);
 438       st->key.x509 = g_tls_certificate_gnutls_copy_key (gnutlscert);
 439       st->deinit_all = TRUE;
 440     }
 441   else
 442     st->ncerts = 0;
 443 }
 444
 445 static void
 446 begin_gnutls_io (GTlsConnectionGnutls  *gnutls,
 447                  gboolean               blocking,
 448                  GCancellable          *cancellable)
 449 {
 450   gnutls->priv->blocking = blocking;
 451   gnutls->priv->cancellable = cancellable;
 452   gnutls->priv->internal_direction = 0;
 453   g_clear_error (&gnutls->priv->error);
 454 }
 455
 456 static int
 457 end_gnutls_io (GTlsConnectionGnutls  *gnutls,
 458                int                    status,
 459                GError               **error)
 460 {
 461   gnutls->priv->cancellable = NULL;
 462
 463   if (status >= 0)
 464     {
 465       g_clear_error (&gnutls->priv->error);
 466       return status;
 467     }
 468
 469   if (gnutls->priv->handshaking && !gnutls->priv->ever_handshaked)
 470     {
 471       if (g_error_matches (gnutls->priv->error, G_IO_ERROR, G_IO_ERROR_FAILED) ||
 472           status == GNUTLS_E_UNEXPECTED_PACKET_LENGTH ||
 473           status == GNUTLS_E_FATAL_ALERT_RECEIVED ||
 474           status == GNUTLS_E_UNSUPPORTED_VERSION_PACKET)
 475         {
 476           g_clear_error (&gnutls->priv->error);
 477           g_set_error_literal (error, G_TLS_ERROR, G_TLS_ERROR_NOT_TLS,
 478                                _("Peer failed to perform TLS handshake"));
 479           return GNUTLS_E_PULL_ERROR;
 480         }
 481     }
 482
 483   if (gnutls->priv->error)
 484     {
 485       if (g_error_matches (gnutls->priv->error, G_IO_ERROR, G_IO_ERROR_WOULD_BLOCK))
 486         status = GNUTLS_E_AGAIN;
 487       g_propagate_error (error, gnutls->priv->error);
 488       gnutls->priv->error = NULL;
 489       return status;
 490     }
 491   else if (status == GNUTLS_E_REHANDSHAKE)
 492     {
 493       if (gnutls->priv->rehandshake_mode == G_TLS_REHANDSHAKE_NEVER)
 494         {
 495           g_set_error_literal (error, G_TLS_ERROR, G_TLS_ERROR_MISC,
 496                                _("Peer requested illegal TLS rehandshake"));
 497           return GNUTLS_E_PULL_ERROR;
 498         }
 499
 500       gnutls->priv->need_handshake = TRUE;
 501       return status;
 502     }
 503   else if (status == GNUTLS_E_UNEXPECTED_PACKET_LENGTH)
 504     {
 505       if (gnutls->priv->eof)
 506         {
 507           if (gnutls->priv->require_close_notify)
 508             {
 509               g_set_error_literal (error, G_TLS_ERROR, G_TLS_ERROR_EOF,
 510                                    _("TLS connection closed unexpectedly"));
 511               return status;
 512             }
 513           else
 514             return 0;
 515         }
 516     }
 517
 518   return status;
 519 }
 520
 521 #define BEGIN_GNUTLS_IO(gnutls, blocking, cancellable)  \
 522   begin_gnutls_io (gnutls, blocking, cancellable);      \
 523   do {
 524
 525 #define END_GNUTLS_IO(gnutls, ret, errmsg, error)       \
 526   } while ((ret == GNUTLS_E_AGAIN ||                    \
 527             ret == GNUTLS_E_WARNING_ALERT_RECEIVED) &&  \
 528            !gnutls->priv->error);                       \
 529   ret = end_gnutls_io (gnutls, ret, error);             \
 530   if (ret && error && !*error)                          \
 531     {                                                   \
 532       g_set_error (error, G_TLS_ERROR, G_TLS_ERROR_MISC,\
 533                    errmsg, gnutls_strerror (ret));      \
 534     }                                                   \
 535   ;
 536
 537 gboolean
 538 g_tls_connection_gnutls_check (GTlsConnectionGnutls  *gnutls,
 539                                GIOCondition           condition)
 540 {
 541   if (!gnutls->priv->internal_direction)
 542     return TRUE;
 543
 544   if (gnutls->priv->handshaking || gnutls->priv->closing)
 545     condition = gnutls->priv->internal_direction;
 546
 547   if (condition & G_IO_IN)
 548     return g_pollable_input_stream_is_readable (gnutls->priv->base_istream);
 549   else
 550     return g_pollable_output_stream_is_writable (gnutls->priv->base_ostream);
 551 }
 552
 553 typedef struct {
 554   GSource source;
 555
 556   GTlsConnectionGnutls *gnutls;
 557   GObject              *stream;
 558
 559   GSource              *child_source;
 560   GIOCondition          current_direction;
 561 } GTlsConnectionGnutlsSource;
 562
 563 static gboolean
 564 gnutls_source_prepare (GSource *source,
 565                        gint    *timeout)
 566 {
 567   *timeout = -1;
 568   return FALSE;
 569 }
 570
 571 static gboolean
 572 gnutls_source_check (GSource *source)
 573 {
 574   return FALSE;
 575 }
 576
 577 static gboolean
 578 gnutls_source_sync_child_source (GTlsConnectionGnutlsSource *gnutls_source)
 579 {
 580   GTlsConnectionGnutls *gnutls = gnutls_source->gnutls;
 581   GSource *source = (GSource *)gnutls_source;
 582   GIOCondition direction;
 583
 584   if (gnutls->priv->handshaking || gnutls->priv->closing)
 585     direction = gnutls->priv->internal_direction;
 586   else if (!gnutls_source->stream)
 587     return FALSE;
 588   else if (G_IS_TLS_INPUT_STREAM_GNUTLS (gnutls_source->stream))
 589     direction = G_IO_IN;
 590   else
 591     direction = G_IO_OUT;
 592
 593   if (direction == gnutls_source->current_direction)
 594     return TRUE;
 595
 596   if (gnutls_source->child_source)
 597     {
 598       g_source_remove_child_source (source, gnutls_source->child_source);
 599       g_source_unref (gnutls_source->child_source);
 600     }
 601
 602   if (direction & G_IO_IN)
 603     gnutls_source->child_source = g_pollable_input_stream_create_source (gnutls->priv->base_istream, NULL);
 604   else
 605     gnutls_source->child_source = g_pollable_output_stream_create_source (gnutls->priv->base_ostream, NULL);
 606
 607   g_source_set_dummy_callback (gnutls_source->child_source);
 608   g_source_add_child_source (source, gnutls_source->child_source);
 609   gnutls_source->current_direction = direction;
 610   return TRUE;
 611 }
 612
 613 static gboolean
 614 gnutls_source_dispatch (GSource     *source,
 615                         GSourceFunc  callback,
 616                         gpointer     user_data)
 617 {
 618   GPollableSourceFunc func = (GPollableSourceFunc)callback;
 619   GTlsConnectionGnutlsSource *gnutls_source = (GTlsConnectionGnutlsSource *)source;
 620   gboolean ret;
 621
 622   ret = (*func) (gnutls_source->stream, user_data);
 623   if (ret)
 624     ret = gnutls_source_sync_child_source (gnutls_source);
 625
 626   return ret;
 627 }
 628
 629 static void
 630 gnutls_source_finalize (GSource *source)
 631 {
 632   GTlsConnectionGnutlsSource *gnutls_source = (GTlsConnectionGnutlsSource *)source;
 633
 634   g_object_unref (gnutls_source->gnutls);
 635
 636   if (gnutls_source->child_source)
 637     g_source_unref (gnutls_source->child_source);
 638 }
 639
 640 static gboolean
 641 g_tls_connection_gnutls_source_closure_callback (GObject  *stream,
 642                                                  gpointer  data)
 643 {
 644   GClosure *closure = data;
 645
 646   GValue param = { 0, };
 647   GValue result_value = { 0, };
 648   gboolean result;
 649
 650   g_value_init (&result_value, G_TYPE_BOOLEAN);
 651
 652   g_value_init (&param, G_TYPE_OBJECT);
 653   g_value_set_object (&param, stream);
 654
 655   g_closure_invoke (closure, &result_value, 1, &param, NULL);
 656
 657   result = g_value_get_boolean (&result_value);
 658   g_value_unset (&result_value);
 659   g_value_unset (&param);
 660
 661   return result;
 662 }
 663
 664 static GSourceFuncs gnutls_source_funcs =
 665 {
 666   gnutls_source_prepare,
 667   gnutls_source_check,
 668   gnutls_source_dispatch,
 669   gnutls_source_finalize,
 670   (GSourceFunc)g_tls_connection_gnutls_source_closure_callback,
 671   (GSourceDummyMarshal)_gnutls_marshal_BOOLEAN__VOID,
 672 };
 673
 674 GSource *
 675 g_tls_connection_gnutls_create_source (GTlsConnectionGnutls  *gnutls,
 676                                        GIOCondition           condition,
 677                                        GCancellable          *cancellable)
 678 {
 679   GSource *source, *cancellable_source;
 680   GTlsConnectionGnutlsSource *gnutls_source;
 681
 682   source = g_source_new (&gnutls_source_funcs, sizeof (GTlsConnectionGnutlsSource));
 683   g_source_set_name (source, "GTlsConnectionGnutlsSource");
 684   gnutls_source = (GTlsConnectionGnutlsSource *)source;
 685   gnutls_source->gnutls = g_object_ref (gnutls);
 686   if (condition & G_IO_IN)
 687     gnutls_source->stream = G_OBJECT (gnutls->priv->tls_istream);
 688   else if (condition & G_IO_OUT)
 689     gnutls_source->stream = G_OBJECT (gnutls->priv->tls_ostream);
 690   gnutls_source_sync_child_source (gnutls_source);
 691
 692   if (cancellable)
 693     {
 694       cancellable_source = g_cancellable_source_new (cancellable);
 695       g_source_set_dummy_callback (cancellable_source);
 696       g_source_add_child_source (source, cancellable_source);
 697       g_source_unref (cancellable_source);
 698     }
 699
 700   return source;
 701 }
 702
 703 static void
 704 set_gnutls_error (GTlsConnectionGnutls *gnutls, GIOCondition direction)
 705 {
 706   if (g_error_matches (gnutls->priv->error, G_IO_ERROR, G_IO_ERROR_CANCELLED))
 707     gnutls_transport_set_errno (gnutls->priv->session, EINTR);
 708   else if (g_error_matches (gnutls->priv->error, G_IO_ERROR, G_IO_ERROR_WOULD_BLOCK))
 709     {
 710       gnutls_transport_set_errno (gnutls->priv->session, EAGAIN);
 711       gnutls->priv->internal_direction = direction;
 712     }
 713   else
 714     gnutls_transport_set_errno (gnutls->priv->session, EIO);
 715 }
 716
 717 static ssize_t
 718 g_tls_connection_gnutls_pull_func (gnutls_transport_ptr_t  transport_data,
 719                                    void                   *buf,
 720                                    size_t                  buflen)
 721 {
 722   GTlsConnectionGnutls *gnutls = transport_data;
 723   ssize_t ret;
 724
 725   /* If gnutls->priv->error is non-%NULL when we're called, it means
 726    * that an error previously occurred, but gnutls decided not to
 727    * propagate it. So it's correct for us to just clear it. (Usually
 728    * this means it ignored an EAGAIN after a short read, and now
 729    * we'll return EAGAIN again, which it will obey this time.)
 730    */
 731   g_clear_error (&gnutls->priv->error);
 732
 733   if (gnutls->priv->blocking)
 734     {
 735       ret = g_input_stream_read (G_INPUT_STREAM (gnutls->priv->base_istream),
 736                                  buf, buflen,
 737                                  gnutls->priv->cancellable,
 738                                  &gnutls->priv->error);
 739     }
 740   else
 741     {
 742       ret = g_pollable_input_stream_read_nonblocking (gnutls->priv->base_istream,
 743                                                       buf, buflen,
 744                                                       gnutls->priv->cancellable,
 745                                                       &gnutls->priv->error);
 746     }
 747
 748   if (ret < 0)
 749     set_gnutls_error (gnutls, G_IO_IN);
 750   else if (ret == 0)
 751     gnutls->priv->eof = TRUE;
 752
 753   return ret;
 754 }
 755
 756 static ssize_t
 757 g_tls_connection_gnutls_push_func (gnutls_transport_ptr_t  transport_data,
 758                                    const void             *buf,
 759                                    size_t                  buflen)
 760 {
 761   GTlsConnectionGnutls *gnutls = transport_data;
 762   ssize_t ret;
 763
 764   /* See comment in pull_func. */
 765   g_clear_error (&gnutls->priv->error);
 766
 767   if (gnutls->priv->blocking)
 768     {
 769       ret = g_output_stream_write (G_OUTPUT_STREAM (gnutls->priv->base_ostream),
 770                                    buf, buflen,
 771                                    gnutls->priv->cancellable,
 772                                    &gnutls->priv->error);
 773     }
 774   else
 775     {
 776       ret = g_pollable_output_stream_write_nonblocking (gnutls->priv->base_ostream,
 777                                                         buf, buflen,
 778                                                         gnutls->priv->cancellable,
 779                                                         &gnutls->priv->error);
 780     }
 781   if (ret < 0)
 782     set_gnutls_error (gnutls, G_IO_OUT);
 783
 784   return ret;
 785 }
 786
 787 static gboolean
 788 handshake_internal (GTlsConnectionGnutls  *gnutls,
 789                     gboolean               blocking,
 790                     GCancellable          *cancellable,
 791                     GError               **error)
 792 {
 793   GTlsCertificate *peer_certificate = NULL;
 794   GTlsCertificateFlags peer_certificate_errors = 0;
 795   int ret;
 796
 797   if (G_IS_TLS_SERVER_CONNECTION_GNUTLS (gnutls) &&
 798       gnutls->priv->ever_handshaked && !gnutls->priv->need_handshake)
 799     {
 800       BEGIN_GNUTLS_IO (gnutls, blocking, cancellable);
 801       ret = gnutls_rehandshake (gnutls->priv->session);
 802       END_GNUTLS_IO (gnutls, ret, _("Error performing TLS handshake: %s"), error);
 803
 804       if (ret != 0)
 805         return FALSE;
 806     }
 807
 808   if (!gnutls->priv->handshaking)
 809     {
 810       gnutls->priv->handshaking = TRUE;
 811
 812       if (gnutls->priv->peer_certificate)
 813         {
 814           g_object_unref (gnutls->priv->peer_certificate);
 815           gnutls->priv->peer_certificate = NULL;
 816           gnutls->priv->peer_certificate_errors = 0;
 817
 818           g_object_notify (G_OBJECT (gnutls), "peer-certificate");
 819           g_object_notify (G_OBJECT (gnutls), "peer-certificate-errors");
 820         }
 821
 822       g_tls_connection_gnutls_set_handshake_priority (gnutls);
 823       G_TLS_CONNECTION_GNUTLS_GET_CLASS (gnutls)->begin_handshake (gnutls);
 824     }
 825
 826   BEGIN_GNUTLS_IO (gnutls, blocking, cancellable);
 827   ret = gnutls_handshake (gnutls->priv->session);
 828   END_GNUTLS_IO (gnutls, ret, _("Error performing TLS handshake: %s"), error);
 829
 830   if (ret == GNUTLS_E_AGAIN)
 831     return FALSE;
 832
 833   gnutls->priv->handshaking = FALSE;
 834   gnutls->priv->need_handshake = FALSE;
 835   gnutls->priv->ever_handshaked = TRUE;
 836
 837   if (ret == 0 &&
 838       gnutls_certificate_type_get (gnutls->priv->session) == GNUTLS_CRT_X509)
 839     {
 840       GTlsCertificate *chain, *cert;
 841       const gnutls_datum_t *certs;
 842       unsigned int num_certs;
 843       int i;
 844
 845       certs = gnutls_certificate_get_peers (gnutls->priv->session, &num_certs);
 846       chain = NULL;
 847       if (certs)
 848         {
 849           for (i = num_certs - 1; i >= 0; i--)
 850             {
 851               cert = g_tls_certificate_gnutls_new (&certs[i], chain);
 852               if (chain)
 853                 g_object_unref (chain);
 854               chain = cert;
 855             }
 856         }
 857
 858       peer_certificate = chain;
 859     }
 860
 861   if (peer_certificate)
 862     {
 863       int status;
 864
 865       status = gnutls_certificate_verify_peers (gnutls->priv->session);
 866       peer_certificate_errors = g_tls_certificate_gnutls_convert_flags (status);
 867       if (peer_certificate_errors)
 868         {
 869           /* gnutls_certificate_verify_peers() bails out on the first
 870            * error, which may be G_TLS_CERTIFICATE_UNKNOWN_CA, but the
 871            * caller may be planning to check that part themselves. So
 872            * call g_tls_certificate_verify() to get any other errors.
 873            */
 874           peer_certificate_errors |= g_tls_certificate_verify (peer_certificate, NULL, NULL);
 875         }
 876
 877       if (!G_TLS_CONNECTION_GNUTLS_GET_CLASS (gnutls)->verify_peer (gnutls, peer_certificate, &peer_certificate_errors))
 878         {
 879           g_object_unref (peer_certificate);
 880           g_set_error_literal (error, G_TLS_ERROR, G_TLS_ERROR_BAD_CERTIFICATE,
 881                                _("Unacceptable TLS certificate"));
 882           return FALSE;
 883         }
 884     }
 885
 886   G_TLS_CONNECTION_GNUTLS_GET_CLASS (gnutls)->finish_handshake (gnutls, error);
 887
 888   if (ret == 0)
 889     {
 890       gnutls->priv->peer_certificate = peer_certificate;
 891       gnutls->priv->peer_certificate_errors = peer_certificate_errors;
 892
 893       g_object_notify (G_OBJECT (gnutls), "peer-certificate");
 894       g_object_notify (G_OBJECT (gnutls), "peer-certificate-errors");
 895
 896       return TRUE;
 897     }
 898   else
 899     return FALSE;
 900 }
 901
 902 static gboolean
 903 handshake_in_progress_or_failed (GTlsConnectionGnutls  *gnutls,
 904                                  gboolean               blocking,
 905                                  GCancellable          *cancellable,
 906                                  GError               **error)
 907 {
 908   if (!(gnutls->priv->need_handshake || gnutls->priv->handshaking))
 909     return FALSE;
 910
 911   return !handshake_internal (gnutls, blocking, cancellable, error);
 912 }
 913
 914 static gboolean
 915 g_tls_connection_gnutls_handshake (GTlsConnection   *conn,
 916                                    GCancellable     *cancellable,
 917                                    GError          **error)
 918 {
 919   GTlsConnectionGnutls *gnutls = G_TLS_CONNECTION_GNUTLS (conn);
 920
 921   return handshake_internal (gnutls, TRUE, cancellable, error);
 922 }
 923
 924 static gboolean
 925 g_tls_connection_gnutls_handshake_ready (GObject  *pollable_stream,
 926                                          gpointer  user_data)
 927 {
 928   GTlsConnectionGnutls *gnutls;
 929   GSimpleAsyncResult *simple = user_data;
 930   gboolean success;
 931   GError *error = NULL;
 932
 933   gnutls = G_TLS_CONNECTION_GNUTLS (g_async_result_get_source_object (G_ASYNC_RESULT (simple)));
 934   g_object_unref (gnutls);
 935
 936   success = handshake_internal (gnutls, FALSE, NULL, &error);
 937   if (!success && g_error_matches (error, G_IO_ERROR, G_IO_ERROR_WOULD_BLOCK))
 938     {
 939       g_error_free (error);
 940       return TRUE;
 941     }
 942
 943   if (error)
 944     {
 945       g_simple_async_result_set_from_error (simple, error);
 946       g_error_free (error);
 947     }
 948   else
 949     g_simple_async_result_set_op_res_gboolean (simple, success);
 950   g_simple_async_result_complete (simple);
 951   g_object_unref (simple);
 952
 953   return FALSE;
 954 }
 955
 956 static void
 957 g_tls_connection_gnutls_handshake_async (GTlsConnection       *conn,
 958                                          int                   io_priority,
 959                                          GCancellable         *cancellable,
 960                                          GAsyncReadyCallback   callback,
 961                                          gpointer              user_data)
 962 {
 963   GTlsConnectionGnutls *gnutls = G_TLS_CONNECTION_GNUTLS (conn);
 964   GSimpleAsyncResult *simple;
 965   gboolean success;
 966   GError *error = NULL;
 967   GSource *source;
 968
 969   simple = g_simple_async_result_new (G_OBJECT (conn), callback, user_data,
 970                                       g_tls_connection_gnutls_handshake_async);
 971   success = handshake_internal (gnutls, FALSE, cancellable, &error);
 972   if (success)
 973     {
 974       g_simple_async_result_set_op_res_gboolean (simple, TRUE);
 975       g_simple_async_result_complete_in_idle (simple);
 976       g_object_unref (simple);
 977     }
 978   else if (!g_error_matches (error, G_IO_ERROR, G_IO_ERROR_WOULD_BLOCK))
 979     {
 980       g_simple_async_result_set_from_error (simple, error);
 981       g_error_free (error);
 982       g_simple_async_result_complete_in_idle (simple);
 983       g_object_unref (simple);
 984     }
 985
 986   source = g_tls_connection_gnutls_create_source (gnutls, 0, cancellable);
 987   g_source_set_callback (source,
 988                          (GSourceFunc) g_tls_connection_gnutls_handshake_ready,
 989                          simple, NULL);
 990   g_source_set_priority (source, io_priority);
 991   g_source_attach (source, g_main_context_get_thread_default ());
 992   g_source_unref (source);
 993 }
 994
 995 static gboolean
 996 g_tls_connection_gnutls_handshake_finish (GTlsConnection       *conn,
 997                                           GAsyncResult         *result,
 998                                           GError              **error)
 999 {
1000   GSimpleAsyncResult *simple;
1001
1002   g_return_val_if_fail (g_simple_async_result_is_valid (result, G_OBJECT (conn), g_tls_connection_gnutls_handshake_async), FALSE);
1003
1004   simple = G_SIMPLE_ASYNC_RESULT (result);
1005
1006   if (g_simple_async_result_propagate_error (simple, error))
1007     return FALSE;
1008
1009   return g_simple_async_result_get_op_res_gboolean (simple);
1010 }
1011
1012 gssize
1013 g_tls_connection_gnutls_read (GTlsConnectionGnutls  *gnutls,
1014                               void                  *buffer,
1015                               gsize                  count,
1016                               gboolean               blocking,
1017                               GCancellable          *cancellable,
1018                               GError               **error)
1019 {
1020   gssize ret;
1021
1022  again:
1023   if (handshake_in_progress_or_failed (gnutls, blocking, cancellable, error))
1024     return -1;
1025
1026   BEGIN_GNUTLS_IO (gnutls, blocking, cancellable);
1027   ret = gnutls_record_recv (gnutls->priv->session, buffer, count);
1028   END_GNUTLS_IO (gnutls, ret, _("Error reading data from TLS socket: %s"), error);
1029
1030   if (ret >= 0)
1031     return ret;
1032   else if (ret == GNUTLS_E_REHANDSHAKE)
1033     goto again;
1034   else
1035     return -1;
1036 }
1037
1038 gssize
1039 g_tls_connection_gnutls_write (GTlsConnectionGnutls  *gnutls,
1040                                const void            *buffer,
1041                                gsize                  count,
1042                                gboolean               blocking,
1043                                GCancellable          *cancellable,
1044                                GError               **error)
1045 {
1046   gssize ret;
1047
1048  again:
1049   if (handshake_in_progress_or_failed (gnutls, blocking, cancellable, error))
1050     return -1;
1051
1052   BEGIN_GNUTLS_IO (gnutls, blocking, cancellable);
1053   ret = gnutls_record_send (gnutls->priv->session, buffer, count);
1054   END_GNUTLS_IO (gnutls, ret, _("Error writing data to TLS socket: %s"), error);
1055
1056   if (ret >= 0)
1057     return ret;
1058   else if (ret == GNUTLS_E_REHANDSHAKE)
1059     goto again;
1060   else
1061     return -1;
1062 }
1063
1064 static GInputStream  *
1065 g_tls_connection_gnutls_get_input_stream (GIOStream *stream)
1066 {
1067   GTlsConnectionGnutls *gnutls = G_TLS_CONNECTION_GNUTLS (stream);
1068
1069   return gnutls->priv->tls_istream;
1070 }
1071
1072 static GOutputStream *
1073 g_tls_connection_gnutls_get_output_stream (GIOStream *stream)
1074 {
1075   GTlsConnectionGnutls *gnutls = G_TLS_CONNECTION_GNUTLS (stream);
1076
1077   return gnutls->priv->tls_ostream;
1078 }
1079
1080 static gboolean
1081 close_internal (GTlsConnectionGnutls  *gnutls,
1082                 gboolean               blocking,
1083                 GCancellable          *cancellable,
1084                 GError               **error)
1085 {
1086   int ret;
1087
1088   /* If we haven't finished the initial handshake yet, there's no
1089    * reason to finish it just so we can close.
1090    */
1091   if (gnutls->priv->handshaking && !gnutls->priv->ever_handshaked)
1092     return TRUE;
1093
1094   if (handshake_in_progress_or_failed (gnutls, blocking, cancellable, error))
1095     return FALSE;
1096
1097   gnutls->priv->closing = TRUE;
1098   BEGIN_GNUTLS_IO (gnutls, blocking, cancellable);
1099   ret = gnutls_bye (gnutls->priv->session, GNUTLS_SHUT_WR);
1100   END_GNUTLS_IO (gnutls, ret, _("Error performing TLS close: %s"), error);
1101   if (ret == 0 || !error || !g_error_matches (*error, G_IO_ERROR, G_IO_ERROR_WOULD_BLOCK))
1102     gnutls->priv->closing = FALSE;
1103
1104   return ret == 0;
1105 }
1106
1107 static gboolean
1108 g_tls_connection_gnutls_close (GIOStream     *stream,
1109                                GCancellable  *cancellable,
1110                                GError       **error)
1111 {
1112   GTlsConnectionGnutls *gnutls = G_TLS_CONNECTION_GNUTLS (stream);
1113
1114   if (!close_internal (gnutls, TRUE, cancellable, error))
1115     return FALSE;
1116   return g_io_stream_close (gnutls->priv->base_io_stream,
1117                             cancellable, error);
1118 }
1119
1120 typedef struct {
1121   GSimpleAsyncResult *simple;
1122   GCancellable *cancellable;
1123   int io_priority;
1124 } AsyncCloseData;
1125
1126 static void
1127 close_base_stream_cb (GObject      *base_stream,
1128                       GAsyncResult *result,
1129                       gpointer      user_data)
1130 {
1131   gboolean success;
1132   GError *error = NULL;
1133   AsyncCloseData *acd = user_data;
1134
1135   success = g_io_stream_close_finish (G_IO_STREAM (base_stream),
1136                                       result, &error);
1137   if (success)
1138     g_simple_async_result_set_op_res_gboolean (acd->simple, TRUE);
1139   else
1140     {
1141       g_simple_async_result_set_from_error (acd->simple, error);
1142       g_error_free (error);
1143     }
1144
1145   g_simple_async_result_complete (acd->simple);
1146   g_object_unref (acd->simple);
1147   if (acd->cancellable)
1148     g_object_unref (acd->cancellable);
1149   g_slice_free (AsyncCloseData, acd);
1150 }
1151
1152 static gboolean
1153 g_tls_connection_gnutls_close_ready (GObject  *pollable_stream,
1154                                      gpointer  user_data)
1155 {
1156   GTlsConnectionGnutls *gnutls;
1157   AsyncCloseData *acd = user_data;
1158   gboolean success;
1159   GError *error = NULL;
1160
1161   gnutls = G_TLS_CONNECTION_GNUTLS (g_async_result_get_source_object (G_ASYNC_RESULT (acd->simple)));
1162   g_object_unref (gnutls);
1163
1164   success = close_internal (gnutls, FALSE, NULL, &error);
1165   if (!success && g_error_matches (error, G_IO_ERROR, G_IO_ERROR_WOULD_BLOCK))
1166     {
1167       g_error_free (error);
1168       return TRUE;
1169     }
1170
1171   if (error)
1172     {
1173       g_simple_async_result_set_from_error (acd->simple, error);
1174       g_simple_async_result_complete (acd->simple);
1175       g_error_free (error);
1176       g_object_unref (acd->simple);
1177       if (acd->cancellable)
1178         g_object_unref (acd->cancellable);
1179       g_slice_free (AsyncCloseData, acd);
1180     }
1181   else
1182     {
1183       g_io_stream_close_async (gnutls->priv->base_io_stream,
1184                                acd->io_priority, acd->cancellable,
1185                                close_base_stream_cb, acd);
1186     }
1187
1188   return FALSE;
1189 }
1190
1191 static void
1192 g_tls_connection_gnutls_close_async (GIOStream           *stream,
1193                                      int                  io_priority,
1194                                      GCancellable        *cancellable,
1195                                      GAsyncReadyCallback  callback,
1196                                      gpointer             user_data)
1197 {
1198   GTlsConnectionGnutls *gnutls = G_TLS_CONNECTION_GNUTLS (stream);
1199   GSimpleAsyncResult *simple;
1200   gboolean success;
1201   GError *error = NULL;
1202   AsyncCloseData *acd;
1203   GSource *source;
1204
1205   simple = g_simple_async_result_new (G_OBJECT (stream), callback, user_data,
1206                                       g_tls_connection_gnutls_close_async);
1207
1208   success = close_internal (gnutls, FALSE, cancellable, &error);
1209   if (error && !g_error_matches (error, G_IO_ERROR, G_IO_ERROR_WOULD_BLOCK))
1210     {
1211       g_simple_async_result_set_from_error (simple, error);
1212       g_error_free (error);
1213       g_simple_async_result_complete_in_idle (simple);
1214       g_object_unref (simple);
1215     }
1216
1217   if (error)
1218     g_error_free (error);
1219
1220   acd = g_slice_new (AsyncCloseData);
1221   acd->simple = simple;
1222   acd->cancellable = g_object_ref (cancellable);
1223   acd->io_priority = io_priority;
1224
1225   if (success)
1226     {
1227       g_io_stream_close_async (gnutls->priv->base_io_stream,
1228                                io_priority, cancellable,
1229                                close_base_stream_cb, acd);
1230       return;
1231     }
1232
1233   source = g_tls_connection_gnutls_create_source (gnutls, 0, acd->cancellable);
1234   g_source_set_callback (source,
1235                          (GSourceFunc) g_tls_connection_gnutls_close_ready,
1236                          acd, NULL);
1237   g_source_set_priority (source, acd->io_priority);
1238   g_source_attach (source, g_main_context_get_thread_default ());
1239   g_source_unref (source);
1240 }
1241
1242 static gboolean
1243 g_tls_connection_gnutls_close_finish (GIOStream           *stream,
1244                                       GAsyncResult        *result,
1245                                       GError             **error)
1246 {
1247   GSimpleAsyncResult *simple;
1248
1249   g_return_val_if_fail (g_simple_async_result_is_valid (result, G_OBJECT (stream), g_tls_connection_gnutls_close_async), FALSE);
1250
1251   simple = G_SIMPLE_ASYNC_RESULT (result);
1252
1253   if (g_simple_async_result_propagate_error (simple, error))
1254     return FALSE;
1255
1256   return g_simple_async_result_get_op_res_gboolean (simple);
1257 }