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/* 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 2.1 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, see <http://www.gnu.org/licenses/>.
*/
#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 any of the
* ways indicated here will be rejected unless the application
* overrides the default via #GTlsConnection::accept-certificate.
*
* GLib guarantees that if certificate verification fails, at least one
* flag will be set, but it does not guarantee that all possible flags
* will be set. Accordingly, you may not safely decide to ignore any
* particular type of error. For example, it would be incorrect to mask
* %G_TLS_CERTIFICATE_EXPIRED if you want to allow expired certificates,
* because this could potentially be the only error flag set even if
* other problems exist with the certificate. Therefore, there is no
* safe way to use this property. This is not a horrible problem,
* though, because you should not be attempting to ignore validation
* errors anyway. If you really must ignore TLS certificate errors,
* connect to #GTlsConnection::accept-certificate.
*
* Since: 2.28
*
* Deprecated: 2.72: Do not attempt to ignore validation errors.
*/
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 |
G_PARAM_DEPRECATED));
/**
* 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:
*
* SSL 3.0 is no longer supported. See
* g_tls_client_connection_set_use_ssl3() for details.
*
* Since: 2.28
*
* Deprecated: 2.56: SSL 3.0 is insecure.
*/
g_object_interface_install_property (iface,
g_param_spec_boolean ("use-ssl3",
P_("Use fallback"),
P_("Use fallback version of SSL/TLS rather than most recent version"),
FALSE,
G_PARAM_READWRITE |
G_PARAM_CONSTRUCT |
G_PARAM_STATIC_STRINGS |
G_PARAM_DEPRECATED));
/**
* GTlsClientConnection:accepted-cas: (type GLib.List) (element-type GLib.ByteArray)
*
* 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 after the handshake completes.
*
* Each item in the list is a #GByteArray which contains the complete
* subject DN of the certificate authority.
*
* Since: 2.28
*/
g_object_interface_install_property (iface,
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));
}
/**
* g_tls_client_connection_new:
* @base_io_stream: the #GIOStream to wrap
* @server_identity: (nullable): 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.
*
* 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.
*
* Returns: (transfer full) (type GTlsClientConnection): the new
* #GTlsClientConnection, or %NULL on error
*
* Since: 2.28
*/
GIOStream *
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_IO_STREAM (conn);
}
/**
* g_tls_client_connection_get_validation_flags:
* @conn: the #GTlsClientConnection
*
* Gets @conn's validation flags
*
* This function does not work as originally designed and is impossible
* to use correctly. See #GTlsClientConnection:validation-flags for more
* information.
*
* Returns: the validation flags
*
* Since: 2.28
*
* Deprecated: 2.72: Do not attempt to ignore validation errors.
*/
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 #GTlsCertificateFlags to use
*
* Sets @conn's validation flags, to override the default set of
* checks performed when validating a server certificate. By default,
* %G_TLS_CERTIFICATE_VALIDATE_ALL is used.
*
* This function does not work as originally designed and is impossible
* to use correctly. See #GTlsClientConnection:validation-flags for more
* information.
*
* Since: 2.28
*
* Deprecated: 2.72: Do not attempt to ignore validation errors.
*/
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
*
* Returns: (nullable) (transfer none): 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
*
* SSL 3.0 is no longer supported. See
* g_tls_client_connection_set_use_ssl3() for details.
*
* Returns: %FALSE
*
* Since: 2.28
*
* Deprecated: 2.56: SSL 3.0 is insecure.
*/
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 FALSE;
}
/**
* g_tls_client_connection_set_use_ssl3:
* @conn: the #GTlsClientConnection
* @use_ssl3: a #gboolean, ignored
*
* Since GLib 2.42.1, SSL 3.0 is no longer supported.
*
* From GLib 2.42.1 through GLib 2.62, this function could be used to
* force use of TLS 1.0, the lowest-supported TLS protocol version at
* the time. In the past, this was needed to connect to broken TLS
* servers that exhibited protocol version intolerance. Such servers
* are no longer common, and using TLS 1.0 is no longer considered
* acceptable.
*
* Since GLib 2.64, this function does nothing.
*
* Since: 2.28
*
* Deprecated: 2.56: SSL 3.0 is insecure.
*/
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", FALSE, 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.
*
* Each item in the list is a #GByteArray which contains the complete
* subject DN of the certificate authority.
*
* Returns: (element-type GByteArray) (transfer full): the list of
* CA DNs. You should unref each element with g_byte_array_unref() and then
* the free the list with g_list_free().
*
* Since: 2.28
*/
GList *
g_tls_client_connection_get_accepted_cas (GTlsClientConnection *conn)
{
GList *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;
}
/**
* g_tls_client_connection_copy_session_state:
* @conn: a #GTlsClientConnection
* @source: a #GTlsClientConnection
*
* Possibly copies session state from one connection to another, for use
* in TLS session resumption. 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, since TLS 1.3,
* it should have been used to read data at least once. @conn should not
* have completed a handshake.
*
* It is not possible to know whether a call to this function will
* actually do anything. Because session resumption is normally used
* only for performance benefit, the TLS backend might not implement
* this function. Even if implemented, it may not actually succeed in
* allowing @conn to resume @source's TLS session, because the server
* may not have sent a session resumption token to @source, or it may
* refuse to accept the token from @conn. There is no way to know
* whether a call to this function is actually successful.
*
* Using this function is not required to benefit from session
* resumption. If the TLS backend supports session resumption, the
* session will be resumed automatically if it is possible to do so
* without weakening the privacy guarantees normally provided by TLS,
* without need to call this function. For example, with TLS 1.3,
* a session ticket will be automatically copied from any
* #GTlsClientConnection that has previously received session tickets
* from the server, provided a ticket is available that has not
* previously been used for session resumption, since session ticket
* reuse would be a privacy weakness. Using this function causes the
* ticket to be copied without regard for privacy considerations.
*
* 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);
}