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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 "error/s2n_errno.h"
#include "stuffer/s2n_stuffer.h"
#include "utils/s2n_safety.h"
#include "tls/s2n_tls_parameters.h"
#include "tls/s2n_connection.h"
#include "tls/s2n_tls.h"
#include "tls/extensions/s2n_server_renegotiation_info.h"
static bool s2n_renegotiation_info_should_send(struct s2n_connection *conn);
static int s2n_renegotiation_info_send(struct s2n_connection *conn, struct s2n_stuffer *out);
static int s2n_renegotiation_info_recv(struct s2n_connection *conn, struct s2n_stuffer *extension);
const s2n_extension_type s2n_server_renegotiation_info_extension = {
.iana_value = TLS_EXTENSION_RENEGOTIATION_INFO,
.is_response = false,
.send = s2n_renegotiation_info_send,
.recv = s2n_renegotiation_info_recv,
.should_send = s2n_renegotiation_info_should_send,
.if_missing = s2n_extension_noop_if_missing,
};
static bool s2n_renegotiation_info_should_send(struct s2n_connection *conn)
{
return conn && conn->secure_renegotiation && s2n_connection_get_protocol_version(conn) < S2N_TLS13;
}
static int s2n_renegotiation_info_send(struct s2n_connection *conn, struct s2n_stuffer *out)
{
/* renegotiated_connection length. Zero since we don't support renegotiation. */
GUARD(s2n_stuffer_write_uint8(out, 0));
return S2N_SUCCESS;
}
static int s2n_renegotiation_info_recv(struct s2n_connection *conn, struct s2n_stuffer *extension)
{
/* RFC5746 Section 3.4: The client MUST then verify that the length of
* the "renegotiated_connection" field is zero, and if it is not, MUST
* abort the handshake. */
uint8_t renegotiated_connection_len;
GUARD(s2n_stuffer_read_uint8(extension, &renegotiated_connection_len));
S2N_ERROR_IF(s2n_stuffer_data_available(extension), S2N_ERR_NON_EMPTY_RENEGOTIATION_INFO);
S2N_ERROR_IF(renegotiated_connection_len, S2N_ERR_NON_EMPTY_RENEGOTIATION_INFO);
notnull_check(conn);
conn->secure_renegotiation = 1;
return S2N_SUCCESS;
}
/* Old-style extension functions -- remove after extensions refactor is complete */
int s2n_recv_server_renegotiation_info_ext(struct s2n_connection *conn, struct s2n_stuffer *extension)
{
return s2n_extension_recv(&s2n_server_renegotiation_info_extension, conn, extension);
}
int s2n_send_server_renegotiation_info_ext(struct s2n_connection *conn, struct s2n_stuffer *out)
{
return s2n_extension_send(&s2n_server_renegotiation_info_extension, conn, out);
}
int s2n_server_renegotiation_info_ext_size(struct s2n_connection *conn)
{
if (s2n_renegotiation_info_should_send(conn)) {
/* 2 for ext type, 2 for extension length, 1 for value of 0 */
return 5;
}
return 0;
}
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