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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.
*/
/* Target Functions: s2n_recv_client_supported_groups s2n_ecc_evp_find_supported_curve */
#include <stdint.h>
#include <openssl/crypto.h>
#include <openssl/err.h>
#include "tls/extensions/s2n_client_supported_groups.h"
#include "api/s2n.h"
#include "stuffer/s2n_stuffer.h"
#include "tls/s2n_connection.h"
#include "tls/s2n_tls.h"
#include "utils/s2n_safety.h"
#include "s2n_test.h"
#include "testlib/s2n_testlib.h"
#include "tls/s2n_tls13.h"
/* This test is for TLS versions 1.3 and up only */
static const uint8_t TLS_VERSIONS[] = {S2N_TLS13};
int s2n_fuzz_init(int *argc, char **argv[])
{
POSIX_GUARD(s2n_enable_tls13_in_test());
return S2N_SUCCESS;
}
int s2n_fuzz_test(const uint8_t *buf, size_t len)
{
/* We need at least one byte of input to set parameters */
S2N_FUZZ_ENSURE_MIN_LEN(len, 1);
/* Setup */
struct s2n_stuffer fuzz_stuffer = {0};
POSIX_GUARD(s2n_stuffer_alloc(&fuzz_stuffer, len + 1));
POSIX_GUARD(s2n_stuffer_write_bytes(&fuzz_stuffer, buf, len));
struct s2n_connection *server_conn = s2n_connection_new(S2N_SERVER);
POSIX_ENSURE_REF(server_conn);
/* Pull a byte off the libfuzzer input and use it to set parameters */
uint8_t randval = 0;
POSIX_GUARD(s2n_stuffer_read_uint8(&fuzz_stuffer, &randval));
server_conn->actual_protocol_version = TLS_VERSIONS[(randval & 0x0F) % s2n_array_len(TLS_VERSIONS)];
server_conn->server_protocol_version = TLS_VERSIONS[(randval >> 4) % s2n_array_len(TLS_VERSIONS)];
/* Run Test
* Do not use GUARD macro here since the connection memory hasn't been freed.
*/
s2n_recv_client_supported_groups(server_conn, &fuzz_stuffer);
/* Cleanup */
POSIX_GUARD(s2n_connection_free(server_conn));
POSIX_GUARD(s2n_stuffer_free(&fuzz_stuffer));
return S2N_SUCCESS;
}
S2N_FUZZ_TARGET(s2n_fuzz_init, s2n_fuzz_test, NULL)
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