gtlsclientconnection.c 11.7 KB
Newer Older
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
/* GIO - GLib Input, Output and Streaming Library
 *
 * Copyright © 2010 Red Hat, Inc
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * 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 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105
 */

#include "config.h"
#include "glib.h"

#include "gtlsclientconnection.h"
#include "ginitable.h"
#include "gioenumtypes.h"
#include "gsocket.h"
#include "gsocketconnectable.h"
#include "gtlsbackend.h"
#include "gtlscertificate.h"
#include "glibintl.h"

/**
 * SECTION:gtlsclientconnection
 * @short_description: TLS client-side connection
 * @include: gio/gio.h
 *
 * #GTlsClientConnection is the client-side subclass of
 * #GTlsConnection, representing a client-side TLS connection.
 */

/**
 * GTlsClientConnection:
 *
 * Abstract base class for the backend-specific client connection
 * type.
 *
 * Since: 2.28
 */

G_DEFINE_INTERFACE (GTlsClientConnection, g_tls_client_connection, G_TYPE_TLS_CONNECTION)

static void
g_tls_client_connection_default_init (GTlsClientConnectionInterface *iface)
{
  /**
   * GTlsClientConnection:validation-flags:
   *
   * What steps to perform when validating a certificate received from
   * a server. Server certificates that fail to validate in all of the
   * ways indicated here will be rejected unless the application
   * overrides the default via #GTlsConnection::accept-certificate.
   *
   * Since: 2.28
   */
  g_object_interface_install_property (iface,
				       g_param_spec_flags ("validation-flags",
							   P_("Validation flags"),
							   P_("What certificate validation to perform"),
							   G_TYPE_TLS_CERTIFICATE_FLAGS,
							   G_TLS_CERTIFICATE_VALIDATE_ALL,
							   G_PARAM_READWRITE |
							   G_PARAM_CONSTRUCT |
							   G_PARAM_STATIC_STRINGS));

  /**
   * GTlsClientConnection:server-identity:
   *
   * A #GSocketConnectable describing the identity of the server that
   * is expected on the other end of the connection.
   *
   * If the %G_TLS_CERTIFICATE_BAD_IDENTITY flag is set in
   * #GTlsClientConnection:validation-flags, this object will be used
   * to determine the expected identify of the remote end of the
   * connection; if #GTlsClientConnection:server-identity is not set,
   * or does not match the identity presented by the server, then the
   * %G_TLS_CERTIFICATE_BAD_IDENTITY validation will fail.
   *
   * In addition to its use in verifying the server certificate,
   * this is also used to give a hint to the server about what
   * certificate we expect, which is useful for servers that serve
   * virtual hosts.
   *
   * Since: 2.28
   */
  g_object_interface_install_property (iface,
				       g_param_spec_object ("server-identity",
							    P_("Server identity"),
							    P_("GSocketConnectable identifying the server"),
							    G_TYPE_SOCKET_CONNECTABLE,
							    G_PARAM_READWRITE |
							    G_PARAM_CONSTRUCT |
							    G_PARAM_STATIC_STRINGS));

  /**
   * GTlsClientConnection:use-ssl3:
   *
106 107 108 109 110 111 112 113 114 115
   * If %TRUE, tells the connection to use a fallback version of TLS
   * or SSL, rather than trying to negotiate the best version of TLS
   * to use. This can be used when talking to servers that don't
   * implement version negotiation correctly and therefore refuse to
   * handshake at all with a "modern" TLS handshake.
   *
   * Despite the property name, the fallback version is not
   * necessarily SSL 3.0; if SSL 3.0 has been disabled, the
   * #GTlsClientConnection will use the next highest available version
   * (normally TLS 1.0) as the fallback version.
116 117 118 119 120
   *
   * Since: 2.28
   */
  g_object_interface_install_property (iface,
				       g_param_spec_boolean ("use-ssl3",
121 122
							     P_("Use fallback"),
							     P_("Use fallback version of SSL/TLS rather than most recent version"),
123 124 125 126 127 128
							     FALSE,
							     G_PARAM_READWRITE |
							     G_PARAM_CONSTRUCT |
							     G_PARAM_STATIC_STRINGS));

  /**
129
   * GTlsClientConnection:accepted-cas: (type GLib.List) (element-type GLib.ByteArray)
130 131 132 133
   *
   * A list of the distinguished names of the Certificate Authorities
   * that the server will accept client certificates signed by. If the
   * server requests a client certificate during the handshake, then
134
   * this property will be set after the handshake completes.
135
   *
136 137 138
   * Each item in the list is a #GByteArray which contains the complete
   * subject DN of the certificate authority.
   *
139 140 141
   * Since: 2.28
   */
  g_object_interface_install_property (iface,
142 143 144 145 146
				       g_param_spec_pointer ("accepted-cas",
							     P_("Accepted CAs"),
							     P_("Distinguished names of the CAs the server accepts certificates from"),
							     G_PARAM_READABLE |
							     G_PARAM_STATIC_STRINGS));
147 148 149 150 151 152 153 154 155 156 157 158
}

/**
 * g_tls_client_connection_new:
 * @base_io_stream: the #GIOStream to wrap
 * @server_identity: (allow-none): the expected identity of the server
 * @error: #GError for error reporting, or %NULL to ignore.
 *
 * Creates a new #GTlsClientConnection wrapping @base_io_stream (which
 * must have pollable input and output streams) which is assumed to
 * communicate with the server identified by @server_identity.
 *
159 160 161 162
 * See the documentation for #GTlsConnection:base-io-stream for restrictions
 * on when application code can run operations on the @base_io_stream after
 * this function has returned.
 *
163
 * Returns: (transfer full) (type GTlsClientConnection): the new
164
 * #GTlsClientConnection, or %NULL on error
165 166 167
 *
 * Since: 2.28
 */
168
GIOStream *
169 170 171 172 173 174 175 176 177 178 179 180 181
g_tls_client_connection_new (GIOStream           *base_io_stream,
			     GSocketConnectable  *server_identity,
			     GError             **error)
{
  GObject *conn;
  GTlsBackend *backend;

  backend = g_tls_backend_get_default ();
  conn = g_initable_new (g_tls_backend_get_client_connection_type (backend),
			 NULL, error,
			 "base-io-stream", base_io_stream,
			 "server-identity", server_identity,
			 NULL);
182
  return G_IO_STREAM (conn);
183 184 185 186 187 188 189 190
}

/**
 * g_tls_client_connection_get_validation_flags:
 * @conn: the #GTlsClientConnection
 *
 * Gets @conn's validation flags
 *
191
 * Returns: the validation flags
192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208
 *
 * Since: 2.28
 */
GTlsCertificateFlags
g_tls_client_connection_get_validation_flags (GTlsClientConnection *conn)
{
  GTlsCertificateFlags flags = 0;

  g_return_val_if_fail (G_IS_TLS_CLIENT_CONNECTION (conn), 0);

  g_object_get (G_OBJECT (conn), "validation-flags", &flags, NULL);
  return flags;
}

/**
 * g_tls_client_connection_set_validation_flags:
 * @conn: the #GTlsClientConnection
209
 * @flags: the #GTlsCertificateFlags to use
210 211
 *
 * Sets @conn's validation flags, to override the default set of
212 213
 * checks performed when validating a server certificate. By default,
 * %G_TLS_CERTIFICATE_VALIDATE_ALL is used.
214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231
 *
 * Since: 2.28
 */
void
g_tls_client_connection_set_validation_flags (GTlsClientConnection  *conn,
					      GTlsCertificateFlags   flags)
{
  g_return_if_fail (G_IS_TLS_CLIENT_CONNECTION (conn));

  g_object_set (G_OBJECT (conn), "validation-flags", flags, NULL);
}

/**
 * g_tls_client_connection_get_server_identity:
 * @conn: the #GTlsClientConnection
 *
 * Gets @conn's expected server identity
 *
232
 * Returns: (transfer none): a #GSocketConnectable describing the
233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279
 * expected server identity, or %NULL if the expected identity is not
 * known.
 *
 * Since: 2.28
 */
GSocketConnectable *
g_tls_client_connection_get_server_identity (GTlsClientConnection *conn)
{
  GSocketConnectable *identity = NULL;

  g_return_val_if_fail (G_IS_TLS_CLIENT_CONNECTION (conn), 0);

  g_object_get (G_OBJECT (conn), "server-identity", &identity, NULL);
  if (identity)
    g_object_unref (identity);
  return identity;
}

/**
 * g_tls_client_connection_set_server_identity:
 * @conn: the #GTlsClientConnection
 * @identity: a #GSocketConnectable describing the expected server identity
 *
 * Sets @conn's expected server identity, which is used both to tell
 * servers on virtual hosts which certificate to present, and also
 * to let @conn know what name to look for in the certificate when
 * performing %G_TLS_CERTIFICATE_BAD_IDENTITY validation, if enabled.
 *
 * Since: 2.28
 */
void
g_tls_client_connection_set_server_identity (GTlsClientConnection *conn,
					     GSocketConnectable   *identity)
{
  g_return_if_fail (G_IS_TLS_CLIENT_CONNECTION (conn));

  g_object_set (G_OBJECT (conn), "server-identity", identity, NULL);
}

/**
 * g_tls_client_connection_get_use_ssl3:
 * @conn: the #GTlsClientConnection
 *
 * Gets whether @conn will use SSL 3.0 rather than the
 * highest-supported version of TLS; see
 * g_tls_client_connection_set_use_ssl3().
 *
280
 * Returns: whether @conn will use SSL 3.0
281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325
 *
 * Since: 2.28
 */
gboolean
g_tls_client_connection_get_use_ssl3 (GTlsClientConnection *conn)
{
  gboolean use_ssl3 = FALSE;

  g_return_val_if_fail (G_IS_TLS_CLIENT_CONNECTION (conn), 0);

  g_object_get (G_OBJECT (conn), "use-ssl3", &use_ssl3, NULL);
  return use_ssl3;
}

/**
 * g_tls_client_connection_set_use_ssl3:
 * @conn: the #GTlsClientConnection
 * @use_ssl3: whether to use SSL 3.0
 *
 * If @use_ssl3 is %TRUE, this forces @conn to use SSL 3.0 rather than
 * trying to properly negotiate the right version of TLS or SSL to use.
 * This can be used when talking to servers that do not implement the
 * fallbacks correctly and which will therefore fail to handshake with
 * a "modern" TLS handshake attempt.
 *
 * Since: 2.28
 */
void
g_tls_client_connection_set_use_ssl3 (GTlsClientConnection *conn,
				      gboolean              use_ssl3)
{
  g_return_if_fail (G_IS_TLS_CLIENT_CONNECTION (conn));

  g_object_set (G_OBJECT (conn), "use-ssl3", use_ssl3, NULL);
}

/**
 * g_tls_client_connection_get_accepted_cas:
 * @conn: the #GTlsClientConnection
 *
 * Gets the list of distinguished names of the Certificate Authorities
 * that the server will accept certificates from. This will be set
 * during the TLS handshake if the server requests a certificate.
 * Otherwise, it will be %NULL.
 *
326 327 328
 * Each item in the list is a #GByteArray which contains the complete
 * subject DN of the certificate authority.
 *
329
 * Returns: (element-type GByteArray) (transfer full): the list of
330 331
 * CA DNs. You should unref each element with g_byte_array_unref() and then
 * the free the list with g_list_free().
332 333 334
 *
 * Since: 2.28
 */
335
GList *
336 337
g_tls_client_connection_get_accepted_cas (GTlsClientConnection *conn)
{
338
  GList *accepted_cas = NULL;
339 340 341 342 343 344

  g_return_val_if_fail (G_IS_TLS_CLIENT_CONNECTION (conn), NULL);

  g_object_get (G_OBJECT (conn), "accepted-cas", &accepted_cas, NULL);
  return accepted_cas;
}
345 346 347 348

/**
 * g_tls_client_connection_copy_session_state:
 * @conn: a #GTlsClientConnection
349
 * @source: a #GTlsClientConnection
350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370
 *
 * Copies session state from one connection to another. This is
 * not normally needed, but may be used when the same session
 * needs to be used between different endpoints as is required
 * by some protocols such as FTP over TLS. @source should have
 * already completed a handshake, and @conn should not have
 * completed a handshake.
 *
 * Since: 2.46
 */
void
g_tls_client_connection_copy_session_state (GTlsClientConnection *conn,
                                            GTlsClientConnection *source)
{
  g_return_if_fail (G_IS_TLS_CLIENT_CONNECTION (conn));
  g_return_if_fail (G_IS_TLS_CLIENT_CONNECTION (source));
  g_return_if_fail (G_TLS_CLIENT_CONNECTION_GET_INTERFACE (conn)->copy_session_state != NULL);

  G_TLS_CLIENT_CONNECTION_GET_INTERFACE (conn)->copy_session_state (conn,
                                                                    source);
}