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