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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_cookie.h"
#include "tls/s2n_tls.h"
#define S2N_SIZE_OF_EXTENSION_TYPE 2
#define S2N_SIZE_OF_EXTENSION_DATA_SIZE 2
#define S2N_SIZE_OF_COOKIE_DATA_SIZE 2
const s2n_extension_type s2n_client_cookie_extension = {
.iana_value = TLS_EXTENSION_COOKIE,
.is_response = true,
.send = s2n_extension_send_noop,
.recv = s2n_extension_recv_noop,
.should_send = s2n_extension_never_send,
.if_missing = s2n_extension_noop_if_missing,
};
static bool s2n_cookie_should_send(struct s2n_connection *conn);
static int s2n_cookie_send(struct s2n_connection *conn, struct s2n_stuffer *out);
static int s2n_cookie_recv(struct s2n_connection *conn, struct s2n_stuffer *extension);
const s2n_extension_type s2n_server_cookie_extension = {
.iana_value = TLS_EXTENSION_COOKIE,
.is_response = false,
.send = s2n_cookie_send,
.recv = s2n_cookie_recv,
.should_send = s2n_cookie_should_send,
.if_missing = s2n_extension_noop_if_missing,
};
static bool s2n_cookie_should_send(struct s2n_connection *conn)
{
return s2n_extension_send_if_tls13_connection(conn)
&& conn && s2n_stuffer_data_available(&conn->cookie_stuffer) > 0;
}
static int s2n_cookie_send(struct s2n_connection *conn, struct s2n_stuffer *out)
{
notnull_check(conn);
uint16_t cookie_size = s2n_stuffer_data_available(&conn->cookie_stuffer);
GUARD(s2n_stuffer_write_uint16(out, cookie_size));
GUARD(s2n_stuffer_copy(&conn->cookie_stuffer, out, cookie_size));
return S2N_SUCCESS;
}
static int s2n_cookie_recv(struct s2n_connection *conn, struct s2n_stuffer *extension)
{
notnull_check(conn);
if (s2n_connection_get_protocol_version(conn) < S2N_TLS13) {
return S2N_SUCCESS;
}
uint16_t cookie_len;
GUARD(s2n_stuffer_read_uint16(extension, &cookie_len));
ENSURE_POSIX(s2n_stuffer_data_available(extension) == cookie_len, S2N_ERR_BAD_MESSAGE);
GUARD(s2n_stuffer_wipe(&conn->cookie_stuffer));
GUARD(s2n_stuffer_resize(&conn->cookie_stuffer, cookie_len));
GUARD(s2n_stuffer_copy(extension, &conn->cookie_stuffer, cookie_len));
return S2N_SUCCESS;
}
/* Old-style extension functions -- remove after extensions refactor is complete */
int s2n_extensions_cookie_size(struct s2n_connection *conn)
{
GUARD(s2n_stuffer_reread(&conn->cookie_stuffer));
if (s2n_stuffer_data_available(&conn->cookie_stuffer) == 0) {
return 0;
}
const int cookie_extension_size = S2N_SIZE_OF_EXTENSION_TYPE
+ S2N_SIZE_OF_EXTENSION_DATA_SIZE
+ S2N_SIZE_OF_COOKIE_DATA_SIZE
+ s2n_stuffer_data_available(&conn->cookie_stuffer);
return cookie_extension_size;
}
int s2n_extensions_cookie_recv(struct s2n_connection *conn, struct s2n_stuffer *extension)
{
return s2n_extension_send(&s2n_server_cookie_extension, conn, extension);
}
int s2n_extensions_cookie_send(struct s2n_connection *conn, struct s2n_stuffer *out)
{
return s2n_extension_send(&s2n_server_cookie_extension, conn, out);
}
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