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d3768c89ae
Improve documentation for footgun function g_tls_client_connection_copy_session_state() See merge request GNOME/glib!1039
396 lines
13 KiB
C
396 lines
13 KiB
C
/* GIO - GLib Input, Output and Streaming Library
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*
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* Copyright © 2010 Red Hat, Inc
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General
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* Public License along with this library; if not, see <http://www.gnu.org/licenses/>.
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*/
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#include "config.h"
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#include "glib.h"
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#include "gtlsclientconnection.h"
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#include "ginitable.h"
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#include "gioenumtypes.h"
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#include "gsocket.h"
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#include "gsocketconnectable.h"
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#include "gtlsbackend.h"
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#include "gtlscertificate.h"
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#include "glibintl.h"
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/**
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* SECTION:gtlsclientconnection
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* @short_description: TLS client-side connection
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* @include: gio/gio.h
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*
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* #GTlsClientConnection is the client-side subclass of
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* #GTlsConnection, representing a client-side TLS connection.
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*/
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/**
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* GTlsClientConnection:
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*
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* Abstract base class for the backend-specific client connection
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* type.
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*
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* Since: 2.28
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*/
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G_DEFINE_INTERFACE (GTlsClientConnection, g_tls_client_connection, G_TYPE_TLS_CONNECTION)
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static void
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g_tls_client_connection_default_init (GTlsClientConnectionInterface *iface)
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{
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/**
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* GTlsClientConnection:validation-flags:
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*
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* What steps to perform when validating a certificate received from
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* a server. Server certificates that fail to validate in all of the
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* ways indicated here will be rejected unless the application
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* overrides the default via #GTlsConnection::accept-certificate.
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*
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* Since: 2.28
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*/
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g_object_interface_install_property (iface,
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g_param_spec_flags ("validation-flags",
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P_("Validation flags"),
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P_("What certificate validation to perform"),
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G_TYPE_TLS_CERTIFICATE_FLAGS,
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G_TLS_CERTIFICATE_VALIDATE_ALL,
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G_PARAM_READWRITE |
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G_PARAM_CONSTRUCT |
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G_PARAM_STATIC_STRINGS));
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/**
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* GTlsClientConnection:server-identity:
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*
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* A #GSocketConnectable describing the identity of the server that
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* is expected on the other end of the connection.
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*
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* If the %G_TLS_CERTIFICATE_BAD_IDENTITY flag is set in
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* #GTlsClientConnection:validation-flags, this object will be used
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* to determine the expected identify of the remote end of the
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* connection; if #GTlsClientConnection:server-identity is not set,
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* or does not match the identity presented by the server, then the
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* %G_TLS_CERTIFICATE_BAD_IDENTITY validation will fail.
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*
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* In addition to its use in verifying the server certificate,
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* this is also used to give a hint to the server about what
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* certificate we expect, which is useful for servers that serve
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* virtual hosts.
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*
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* Since: 2.28
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*/
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g_object_interface_install_property (iface,
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g_param_spec_object ("server-identity",
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P_("Server identity"),
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P_("GSocketConnectable identifying the server"),
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G_TYPE_SOCKET_CONNECTABLE,
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G_PARAM_READWRITE |
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G_PARAM_CONSTRUCT |
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G_PARAM_STATIC_STRINGS));
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/**
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* GTlsClientConnection:use-ssl3:
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*
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* SSL 3.0 is no longer supported. See
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* g_tls_client_connection_set_use_ssl3() for details.
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*
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* Since: 2.28
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*
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* Deprecated: 2.56: SSL 3.0 is insecure.
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*/
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g_object_interface_install_property (iface,
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g_param_spec_boolean ("use-ssl3",
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P_("Use fallback"),
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P_("Use fallback version of SSL/TLS rather than most recent version"),
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FALSE,
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G_PARAM_READWRITE |
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G_PARAM_CONSTRUCT |
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G_PARAM_STATIC_STRINGS |
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G_PARAM_DEPRECATED));
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/**
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* GTlsClientConnection:accepted-cas: (type GLib.List) (element-type GLib.ByteArray)
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*
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* A list of the distinguished names of the Certificate Authorities
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* that the server will accept client certificates signed by. If the
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* server requests a client certificate during the handshake, then
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* this property will be set after the handshake completes.
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*
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* Each item in the list is a #GByteArray which contains the complete
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* subject DN of the certificate authority.
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*
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* Since: 2.28
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*/
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g_object_interface_install_property (iface,
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g_param_spec_pointer ("accepted-cas",
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P_("Accepted CAs"),
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P_("Distinguished names of the CAs the server accepts certificates from"),
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G_PARAM_READABLE |
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G_PARAM_STATIC_STRINGS));
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}
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/**
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* g_tls_client_connection_new:
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* @base_io_stream: the #GIOStream to wrap
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* @server_identity: (nullable): the expected identity of the server
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* @error: #GError for error reporting, or %NULL to ignore.
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*
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* Creates a new #GTlsClientConnection wrapping @base_io_stream (which
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* must have pollable input and output streams) which is assumed to
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* communicate with the server identified by @server_identity.
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*
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* See the documentation for #GTlsConnection:base-io-stream for restrictions
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* on when application code can run operations on the @base_io_stream after
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* this function has returned.
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*
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* Returns: (transfer full) (type GTlsClientConnection): the new
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* #GTlsClientConnection, or %NULL on error
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*
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* Since: 2.28
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*/
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GIOStream *
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g_tls_client_connection_new (GIOStream *base_io_stream,
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GSocketConnectable *server_identity,
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GError **error)
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{
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GObject *conn;
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GTlsBackend *backend;
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backend = g_tls_backend_get_default ();
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conn = g_initable_new (g_tls_backend_get_client_connection_type (backend),
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NULL, error,
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"base-io-stream", base_io_stream,
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"server-identity", server_identity,
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NULL);
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return G_IO_STREAM (conn);
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}
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/**
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* g_tls_client_connection_get_validation_flags:
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* @conn: the #GTlsClientConnection
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*
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* Gets @conn's validation flags
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*
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* Returns: the validation flags
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*
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* Since: 2.28
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*/
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GTlsCertificateFlags
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g_tls_client_connection_get_validation_flags (GTlsClientConnection *conn)
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{
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GTlsCertificateFlags flags = 0;
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g_return_val_if_fail (G_IS_TLS_CLIENT_CONNECTION (conn), 0);
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g_object_get (G_OBJECT (conn), "validation-flags", &flags, NULL);
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return flags;
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}
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/**
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* g_tls_client_connection_set_validation_flags:
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* @conn: the #GTlsClientConnection
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* @flags: the #GTlsCertificateFlags to use
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*
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* Sets @conn's validation flags, to override the default set of
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* checks performed when validating a server certificate. By default,
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* %G_TLS_CERTIFICATE_VALIDATE_ALL is used.
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*
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* Since: 2.28
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*/
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void
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g_tls_client_connection_set_validation_flags (GTlsClientConnection *conn,
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GTlsCertificateFlags flags)
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{
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g_return_if_fail (G_IS_TLS_CLIENT_CONNECTION (conn));
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g_object_set (G_OBJECT (conn), "validation-flags", flags, NULL);
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}
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/**
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* g_tls_client_connection_get_server_identity:
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* @conn: the #GTlsClientConnection
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*
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* Gets @conn's expected server identity
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*
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* Returns: (transfer none): a #GSocketConnectable describing the
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* expected server identity, or %NULL if the expected identity is not
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* known.
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*
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* Since: 2.28
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*/
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GSocketConnectable *
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g_tls_client_connection_get_server_identity (GTlsClientConnection *conn)
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{
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GSocketConnectable *identity = NULL;
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g_return_val_if_fail (G_IS_TLS_CLIENT_CONNECTION (conn), 0);
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g_object_get (G_OBJECT (conn), "server-identity", &identity, NULL);
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if (identity)
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g_object_unref (identity);
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return identity;
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}
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/**
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* g_tls_client_connection_set_server_identity:
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* @conn: the #GTlsClientConnection
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* @identity: a #GSocketConnectable describing the expected server identity
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*
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* Sets @conn's expected server identity, which is used both to tell
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* servers on virtual hosts which certificate to present, and also
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* to let @conn know what name to look for in the certificate when
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* performing %G_TLS_CERTIFICATE_BAD_IDENTITY validation, if enabled.
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*
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* Since: 2.28
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*/
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void
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g_tls_client_connection_set_server_identity (GTlsClientConnection *conn,
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GSocketConnectable *identity)
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{
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g_return_if_fail (G_IS_TLS_CLIENT_CONNECTION (conn));
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g_object_set (G_OBJECT (conn), "server-identity", identity, NULL);
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}
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/**
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* g_tls_client_connection_get_use_ssl3:
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* @conn: the #GTlsClientConnection
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*
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* SSL 3.0 is no longer supported. See
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* g_tls_client_connection_set_use_ssl3() for details.
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*
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* Returns: %FALSE
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*
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* Since: 2.28
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*
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* Deprecated: 2.56: SSL 3.0 is insecure.
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*/
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gboolean
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g_tls_client_connection_get_use_ssl3 (GTlsClientConnection *conn)
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{
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gboolean use_ssl3 = FALSE;
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g_return_val_if_fail (G_IS_TLS_CLIENT_CONNECTION (conn), 0);
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g_object_get (G_OBJECT (conn), "use-ssl3", &use_ssl3, NULL);
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return FALSE;
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}
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/**
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* g_tls_client_connection_set_use_ssl3:
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* @conn: the #GTlsClientConnection
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* @use_ssl3: a #gboolean, ignored
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*
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* Since GLib 2.42.1, SSL 3.0 is no longer supported.
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*
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* From GLib 2.42.1 through GLib 2.62, this function could be used to
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* force use of TLS 1.0, the lowest-supported TLS protocol version at
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* the time. In the past, this was needed to connect to broken TLS
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* servers that exhibited protocol version intolerance. Such servers
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* are no longer common, and using TLS 1.0 is no longer considered
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* acceptable.
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*
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* Since GLib 2.64, this function does nothing.
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*
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* Since: 2.28
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*
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* Deprecated: 2.56: SSL 3.0 is insecure.
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*/
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void
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g_tls_client_connection_set_use_ssl3 (GTlsClientConnection *conn,
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gboolean use_ssl3)
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{
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g_return_if_fail (G_IS_TLS_CLIENT_CONNECTION (conn));
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g_object_set (G_OBJECT (conn), "use-ssl3", FALSE, NULL);
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}
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/**
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* g_tls_client_connection_get_accepted_cas:
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* @conn: the #GTlsClientConnection
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*
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* Gets the list of distinguished names of the Certificate Authorities
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* that the server will accept certificates from. This will be set
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* during the TLS handshake if the server requests a certificate.
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* Otherwise, it will be %NULL.
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*
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* Each item in the list is a #GByteArray which contains the complete
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* subject DN of the certificate authority.
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*
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* Returns: (element-type GByteArray) (transfer full): the list of
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* CA DNs. You should unref each element with g_byte_array_unref() and then
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* the free the list with g_list_free().
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*
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* Since: 2.28
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*/
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GList *
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g_tls_client_connection_get_accepted_cas (GTlsClientConnection *conn)
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{
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GList *accepted_cas = NULL;
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g_return_val_if_fail (G_IS_TLS_CLIENT_CONNECTION (conn), NULL);
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g_object_get (G_OBJECT (conn), "accepted-cas", &accepted_cas, NULL);
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return accepted_cas;
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}
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/**
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* g_tls_client_connection_copy_session_state:
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* @conn: a #GTlsClientConnection
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* @source: a #GTlsClientConnection
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*
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* Possibly copies session state from one connection to another, for use
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* in TLS session resumption. This is not normally needed, but may be
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* used when the same session needs to be used between different
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* endpoints, as is required by some protocols, such as FTP over TLS.
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* @source should have already completed a handshake and, since TLS 1.3,
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* it should have been used to read data at least once. @conn should not
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* have completed a handshake.
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*
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* It is not possible to know whether a call to this function will
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* actually do anything. Because session resumption is normally used
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* only for performance benefit, the TLS backend might not implement
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* this function. Even if implemented, it may not actually succeed in
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* allowing @conn to resume @source's TLS session, because the server
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* may not have sent a session resumption token to @source, or it may
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* refuse to accept the token from @conn. There is no way to know
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* whether a call to this function is actually successful.
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*
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* Using this function is not required to benefit from session
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* resumption. If the TLS backend supports session resumption, the
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* session will be resumed automatically if it is possible to do so
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* without weakening the privacy guarantees normally provided by TLS,
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* without need to call this function. For example, with TLS 1.3,
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* a session ticket will be automatically copied from any
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* #GTlsClientConnection that has previously received session tickets
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* from the server, provided a ticket is available that has not
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* previously been used for session resumption, since session ticket
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* reuse would be a privacy weakness. Using this function causes the
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* ticket to be copied without regard for privacy considerations.
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*
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* Since: 2.46
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*/
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void
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g_tls_client_connection_copy_session_state (GTlsClientConnection *conn,
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GTlsClientConnection *source)
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{
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g_return_if_fail (G_IS_TLS_CLIENT_CONNECTION (conn));
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g_return_if_fail (G_IS_TLS_CLIENT_CONNECTION (source));
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g_return_if_fail (G_TLS_CLIENT_CONNECTION_GET_INTERFACE (conn)->copy_session_state != NULL);
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G_TLS_CLIENT_CONNECTION_GET_INTERFACE (conn)->copy_session_state (conn,
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source);
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}
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