glib/gio/gtlsclientconnection.c
Dan Winship 59d62726de Add initial TLS (SSL) support to gio
This adds an extension point for TLS connections to gio, with a
gnutls-based implementation in glib-networking.

Full TLS support is still a work in progress; the current API is
missing some features, and parts of it may still be changed before
2.28.

https://bugzilla.gnome.org/show_bug.cgi?id=588189
2010-11-26 15:57:11 -05:00

334 lines
10 KiB
C

/* 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
* Public License along with this library; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place, Suite 330,
* Boston, MA 02111-1307, USA.
*/
#include "config.h"
#include "glib.h"
#include "gtlsclientconnection.h"
#include "ginitable.h"
#include "gioenumtypes.h"
#include "gio-marshal.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.
*
* Since: 2.28
*/
/**
* 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:
*
* If %TRUE, tells the connection to use SSL 3.0 rather than trying
* to negotiate the best version of TLS or SSL 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.
*
* Since: 2.28
*/
g_object_interface_install_property (iface,
g_param_spec_boolean ("use-ssl3",
P_("Use SSL3"),
P_("Use SSL 3.0 rather than trying to use TLS 1.x"),
FALSE,
G_PARAM_READWRITE |
G_PARAM_CONSTRUCT |
G_PARAM_STATIC_STRINGS));
/**
* GTlsClientConnection:accepted-cas:
*
* 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
* this property will be set by the time the
* #GTlsConnection::need-certificate signal is emitted.
*
* Since: 2.28
*/
g_object_interface_install_property (iface,
g_param_spec_boxed ("accepted-cas",
P_("Accepted CAs"),
P_("Distinguished names of the CAs the server accepts certificates from"),
G_TYPE_STRV,
G_PARAM_READABLE |
G_PARAM_STATIC_STRINGS));
}
/**
* 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.
*
* Return value: the new #GTlsClientConnection, or %NULL on error
*
* Since: 2.28
*/
GTlsClientConnection *
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);
return G_TLS_CLIENT_CONNECTION (conn);
}
/**
* g_tls_client_connection_get_validation_flags:
* @conn: the #GTlsClientConnection
*
* Gets @conn's validation flags
*
* Return value: the validation flags
*
* 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
* @flags: the #GTlsCertificatelags to use
*
* Sets @conn's validation flags, to override the default set of
* checks performed when validating a server certificate.
*
* 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
*
* Return value: a #GSocketConnectable describing the
* 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().
*
* Return value: whether @conn will use SSL 3.0
*
* 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.
*
* Return value: (transfer full) (array zero-terminated=1): the list
* of CA names, which you must free (eg, with g_strfreev()).
*
* Since: 2.28
*/
char **
g_tls_client_connection_get_accepted_cas (GTlsClientConnection *conn)
{
char **accepted_cas = NULL;
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;
}