gio/gtlsclientconnection.c

   1 /* GIO - GLib Input, Output and Streaming Library
   2  *
   3  * Copyright © 2010 Red Hat, Inc
   4  *
   5  * This library is free software; you can redistribute it and/or
   6  * modify it under the terms of the GNU Lesser General Public
   7  * License as published by the Free Software Foundation; either
   8  * version 2 of the License, or (at your option) any later version.
   9  *
  10  * This library is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13  * Lesser General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU Lesser General
  16  * Public License along with this library; if not, see <http://www.gnu.org/licenses/>.
  17  */
  18
  19 #include "config.h"
  20 #include "glib.h"
  21
  22 #include "gtlsclientconnection.h"
  23 #include "ginitable.h"
  24 #include "gioenumtypes.h"
  25 #include "gsocket.h"
  26 #include "gsocketconnectable.h"
  27 #include "gtlsbackend.h"
  28 #include "gtlscertificate.h"
  29 #include "glibintl.h"
  30
  31 /**
  32  * SECTION:gtlsclientconnection
  33  * @short_description: TLS client-side connection
  34  * @include: gio/gio.h
  35  *
  36  * #GTlsClientConnection is the client-side subclass of
  37  * #GTlsConnection, representing a client-side TLS connection.
  38  */
  39
  40 /**
  41  * GTlsClientConnection:
  42  *
  43  * Abstract base class for the backend-specific client connection
  44  * type.
  45  *
  46  * Since: 2.28
  47  */
  48
  49 G_DEFINE_INTERFACE (GTlsClientConnection, g_tls_client_connection, G_TYPE_TLS_CONNECTION)
  50
  51 static void
  52 g_tls_client_connection_default_init (GTlsClientConnectionInterface *iface)
  53 {
  54   /**
  55    * GTlsClientConnection:validation-flags:
  56    *
  57    * What steps to perform when validating a certificate received from
  58    * a server. Server certificates that fail to validate in all of the
  59    * ways indicated here will be rejected unless the application
  60    * overrides the default via #GTlsConnection::accept-certificate.
  61    *
  62    * Since: 2.28
  63    */
  64   g_object_interface_install_property (iface,
  65                                        g_param_spec_flags ("validation-flags",
  66                                                            P_("Validation flags"),
  67                                                            P_("What certificate validation to perform"),
  68                                                            G_TYPE_TLS_CERTIFICATE_FLAGS,
  69                                                            G_TLS_CERTIFICATE_VALIDATE_ALL,
  70                                                            G_PARAM_READWRITE |
  71                                                            G_PARAM_CONSTRUCT |
  72                                                            G_PARAM_STATIC_STRINGS));
  73
  74   /**
  75    * GTlsClientConnection:server-identity:
  76    *
  77    * A #GSocketConnectable describing the identity of the server that
  78    * is expected on the other end of the connection.
  79    *
  80    * If the %G_TLS_CERTIFICATE_BAD_IDENTITY flag is set in
  81    * #GTlsClientConnection:validation-flags, this object will be used
  82    * to determine the expected identify of the remote end of the
  83    * connection; if #GTlsClientConnection:server-identity is not set,
  84    * or does not match the identity presented by the server, then the
  85    * %G_TLS_CERTIFICATE_BAD_IDENTITY validation will fail.
  86    *
  87    * In addition to its use in verifying the server certificate,
  88    * this is also used to give a hint to the server about what
  89    * certificate we expect, which is useful for servers that serve
  90    * virtual hosts.
  91    *
  92    * Since: 2.28
  93    */
  94   g_object_interface_install_property (iface,
  95                                        g_param_spec_object ("server-identity",
  96                                                             P_("Server identity"),
  97                                                             P_("GSocketConnectable identifying the server"),
  98                                                             G_TYPE_SOCKET_CONNECTABLE,
  99                                                             G_PARAM_READWRITE |
 100                                                             G_PARAM_CONSTRUCT |
 101                                                             G_PARAM_STATIC_STRINGS));
 102
 103   /**
 104    * GTlsClientConnection:use-ssl3:
 105    *
 106    * If %TRUE, tells the connection to use SSL 3.0 rather than trying
 107    * to negotiate the best version of TLS or SSL to use. This can be
 108    * used when talking to servers that don't implement version
 109    * negotiation correctly and therefore refuse to handshake at all with
 110    * a "modern" TLS handshake.
 111    *
 112    * Since: 2.28
 113    */
 114   g_object_interface_install_property (iface,
 115                                        g_param_spec_boolean ("use-ssl3",
 116                                                              P_("Use SSL3"),
 117                                                              P_("Use SSL 3.0 rather than trying to use TLS 1.x"),
 118                                                              FALSE,
 119                                                              G_PARAM_READWRITE |
 120                                                              G_PARAM_CONSTRUCT |
 121                                                              G_PARAM_STATIC_STRINGS));
 122
 123   /**
 124    * GTlsClientConnection:accepted-cas: (type GLib.List) (element-type GLib.ByteArray):
 125    *
 126    * A list of the distinguished names of the Certificate Authorities
 127    * that the server will accept client certificates signed by. If the
 128    * server requests a client certificate during the handshake, then
 129    * this property will be set after the handshake completes.
 130    *
 131    * Each item in the list is a #GByteArray which contains the complete
 132    * subject DN of the certificate authority.
 133    *
 134    * Since: 2.28
 135    */
 136   g_object_interface_install_property (iface,
 137                                        g_param_spec_pointer ("accepted-cas",
 138                                                              P_("Accepted CAs"),
 139                                                              P_("Distinguished names of the CAs the server accepts certificates from"),
 140                                                              G_PARAM_READABLE |
 141                                                              G_PARAM_STATIC_STRINGS));
 142 }
 143
 144 /**
 145  * g_tls_client_connection_new:
 146  * @base_io_stream: the #GIOStream to wrap
 147  * @server_identity: (allow-none): the expected identity of the server
 148  * @error: #GError for error reporting, or %NULL to ignore.
 149  *
 150  * Creates a new #GTlsClientConnection wrapping @base_io_stream (which
 151  * must have pollable input and output streams) which is assumed to
 152  * communicate with the server identified by @server_identity.
 153  *
 154  * Returns: (transfer full) (type GTlsClientConnection): the new
 155  * #GTlsClientConnection, or %NULL on error
 156  *
 157  * Since: 2.28
 158  */
 159 GIOStream *
 160 g_tls_client_connection_new (GIOStream           *base_io_stream,
 161                              GSocketConnectable  *server_identity,
 162                              GError             **error)
 163 {
 164   GObject *conn;
 165   GTlsBackend *backend;
 166
 167   backend = g_tls_backend_get_default ();
 168   conn = g_initable_new (g_tls_backend_get_client_connection_type (backend),
 169                          NULL, error,
 170                          "base-io-stream", base_io_stream,
 171                          "server-identity", server_identity,
 172                          NULL);
 173   return G_IO_STREAM (conn);
 174 }
 175
 176 /**
 177  * g_tls_client_connection_get_validation_flags:
 178  * @conn: the #GTlsClientConnection
 179  *
 180  * Gets @conn's validation flags
 181  *
 182  * Returns: the validation flags
 183  *
 184  * Since: 2.28
 185  */
 186 GTlsCertificateFlags
 187 g_tls_client_connection_get_validation_flags (GTlsClientConnection *conn)
 188 {
 189   GTlsCertificateFlags flags = 0;
 190
 191   g_return_val_if_fail (G_IS_TLS_CLIENT_CONNECTION (conn), 0);
 192
 193   g_object_get (G_OBJECT (conn), "validation-flags", &flags, NULL);
 194   return flags;
 195 }
 196
 197 /**
 198  * g_tls_client_connection_set_validation_flags:
 199  * @conn: the #GTlsClientConnection
 200  * @flags: the #GTlsCertificateFlags to use
 201  *
 202  * Sets @conn's validation flags, to override the default set of
 203  * checks performed when validating a server certificate. By default,
 204  * %G_TLS_CERTIFICATE_VALIDATE_ALL is used.
 205  *
 206  * Since: 2.28
 207  */
 208 void
 209 g_tls_client_connection_set_validation_flags (GTlsClientConnection  *conn,
 210                                               GTlsCertificateFlags   flags)
 211 {
 212   g_return_if_fail (G_IS_TLS_CLIENT_CONNECTION (conn));
 213
 214   g_object_set (G_OBJECT (conn), "validation-flags", flags, NULL);
 215 }
 216
 217 /**
 218  * g_tls_client_connection_get_server_identity:
 219  * @conn: the #GTlsClientConnection
 220  *
 221  * Gets @conn's expected server identity
 222  *
 223  * Returns: (transfer none): a #GSocketConnectable describing the
 224  * expected server identity, or %NULL if the expected identity is not
 225  * known.
 226  *
 227  * Since: 2.28
 228  */
 229 GSocketConnectable *
 230 g_tls_client_connection_get_server_identity (GTlsClientConnection *conn)
 231 {
 232   GSocketConnectable *identity = NULL;
 233
 234   g_return_val_if_fail (G_IS_TLS_CLIENT_CONNECTION (conn), 0);
 235
 236   g_object_get (G_OBJECT (conn), "server-identity", &identity, NULL);
 237   if (identity)
 238     g_object_unref (identity);
 239   return identity;
 240 }
 241
 242 /**
 243  * g_tls_client_connection_set_server_identity:
 244  * @conn: the #GTlsClientConnection
 245  * @identity: a #GSocketConnectable describing the expected server identity
 246  *
 247  * Sets @conn's expected server identity, which is used both to tell
 248  * servers on virtual hosts which certificate to present, and also
 249  * to let @conn know what name to look for in the certificate when
 250  * performing %G_TLS_CERTIFICATE_BAD_IDENTITY validation, if enabled.
 251  *
 252  * Since: 2.28
 253  */
 254 void
 255 g_tls_client_connection_set_server_identity (GTlsClientConnection *conn,
 256                                              GSocketConnectable   *identity)
 257 {
 258   g_return_if_fail (G_IS_TLS_CLIENT_CONNECTION (conn));
 259
 260   g_object_set (G_OBJECT (conn), "server-identity", identity, NULL);
 261 }
 262
 263 /**
 264  * g_tls_client_connection_get_use_ssl3:
 265  * @conn: the #GTlsClientConnection
 266  *
 267  * Gets whether @conn will use SSL 3.0 rather than the
 268  * highest-supported version of TLS; see
 269  * g_tls_client_connection_set_use_ssl3().
 270  *
 271  * Returns: whether @conn will use SSL 3.0
 272  *
 273  * Since: 2.28
 274  */
 275 gboolean
 276 g_tls_client_connection_get_use_ssl3 (GTlsClientConnection *conn)
 277 {
 278   gboolean use_ssl3 = FALSE;
 279
 280   g_return_val_if_fail (G_IS_TLS_CLIENT_CONNECTION (conn), 0);
 281
 282   g_object_get (G_OBJECT (conn), "use-ssl3", &use_ssl3, NULL);
 283   return use_ssl3;
 284 }
 285
 286 /**
 287  * g_tls_client_connection_set_use_ssl3:
 288  * @conn: the #GTlsClientConnection
 289  * @use_ssl3: whether to use SSL 3.0
 290  *
 291  * If @use_ssl3 is %TRUE, this forces @conn to use SSL 3.0 rather than
 292  * trying to properly negotiate the right version of TLS or SSL to use.
 293  * This can be used when talking to servers that do not implement the
 294  * fallbacks correctly and which will therefore fail to handshake with
 295  * a "modern" TLS handshake attempt.
 296  *
 297  * Since: 2.28
 298  */
 299 void
 300 g_tls_client_connection_set_use_ssl3 (GTlsClientConnection *conn,
 301                                       gboolean              use_ssl3)
 302 {
 303   g_return_if_fail (G_IS_TLS_CLIENT_CONNECTION (conn));
 304
 305   g_object_set (G_OBJECT (conn), "use-ssl3", use_ssl3, NULL);
 306 }
 307
 308 /**
 309  * g_tls_client_connection_get_accepted_cas:
 310  * @conn: the #GTlsClientConnection
 311  *
 312  * Gets the list of distinguished names of the Certificate Authorities
 313  * that the server will accept certificates from. This will be set
 314  * during the TLS handshake if the server requests a certificate.
 315  * Otherwise, it will be %NULL.
 316  *
 317  * Each item in the list is a #GByteArray which contains the complete
 318  * subject DN of the certificate authority.
 319  *
 320  * Returns: (element-type GByteArray) (transfer full): the list of
 321  * CA DNs. You should unref each element with g_byte_array_unref() and then
 322  * the free the list with g_list_free().
 323  *
 324  * Since: 2.28
 325  */
 326 GList *
 327 g_tls_client_connection_get_accepted_cas (GTlsClientConnection *conn)
 328 {
 329   GList *accepted_cas = NULL;
 330
 331   g_return_val_if_fail (G_IS_TLS_CLIENT_CONNECTION (conn), NULL);
 332
 333   g_object_get (G_OBJECT (conn), "accepted-cas", &accepted_cas, NULL);
 334   return accepted_cas;
 335 }