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/*
* Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
*
* Licensed under the Apache License, Version 2.0 (the "License").
* You may not use this file except in compliance with the License.
* A copy of the License is located at
*
* http://aws.amazon.com/apache2.0
*
* or in the "license" file accompanying this file. This file is distributed
* on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either
* express or implied. See the License for the specific language governing
* permissions and limitations under the License.
*/
#include "tls/extensions/s2n_quic_transport_params.h"
#include "stuffer/s2n_stuffer.h"
#include "tls/s2n_connection.h"
#include "tls/s2n_tls.h"
#include "utils/s2n_safety.h"
/*
* The quic_transport_params extension is required by the QUIC protocol to
* negotiate additional connection parameters when using S2N.
*
* This extension should not be sent or received unless using S2N with QUIC.
* S2N treats the extension data as opaque bytes and performs no validation.
*/
static bool s2n_quic_transport_params_should_send(struct s2n_connection *conn)
{
return s2n_connection_is_quic_enabled(conn);
}
static int s2n_quic_transport_params_if_missing(struct s2n_connection *conn)
{
POSIX_ENSURE_REF(conn);
POSIX_ENSURE_REF(conn->config);
POSIX_ENSURE(!s2n_connection_is_quic_enabled(conn), S2N_ERR_MISSING_EXTENSION);
return S2N_SUCCESS;
}
static int s2n_quic_transport_params_send(struct s2n_connection *conn, struct s2n_stuffer *out)
{
POSIX_ENSURE_REF(conn);
POSIX_ENSURE_REF(out);
if (conn->our_quic_transport_parameters.size) {
POSIX_GUARD(s2n_stuffer_write(out, &conn->our_quic_transport_parameters));
}
return S2N_SUCCESS;
}
static int s2n_quic_transport_params_recv(struct s2n_connection *conn, struct s2n_stuffer *extension)
{
POSIX_ENSURE_REF(conn);
POSIX_ENSURE_REF(extension);
POSIX_ENSURE_REF(conn->config);
POSIX_ENSURE(s2n_connection_is_quic_enabled(conn), S2N_ERR_UNSUPPORTED_EXTENSION);
if (s2n_stuffer_data_available(extension)) {
POSIX_GUARD(s2n_alloc(&conn->peer_quic_transport_parameters, s2n_stuffer_data_available(extension)));
POSIX_GUARD(s2n_stuffer_read(extension, &conn->peer_quic_transport_parameters));
}
return S2N_SUCCESS;
}
const s2n_extension_type s2n_quic_transport_parameters_extension = {
.iana_value = TLS_QUIC_TRANSPORT_PARAMETERS,
.minimum_version = S2N_TLS13,
.is_response = false,
.send = s2n_quic_transport_params_send,
.recv = s2n_quic_transport_params_recv,
.should_send = s2n_quic_transport_params_should_send,
.if_missing = s2n_quic_transport_params_if_missing,
};
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