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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_cert_req_recv s2n_recv_client_cert_preferences
s2n_cert_type_to_pkey_type s2n_recv_supported_sig_scheme_list
s2n_choose_sig_scheme_from_peer_preference_list
s2n_set_cert_chain_as_client */
#include <errno.h>
#include <fcntl.h>
#include <stddef.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include "api/s2n.h"
#include "stuffer/s2n_stuffer.h"
#include "tls/s2n_cipher_suites.h"
#include "tls/s2n_config.h"
#include "tls/s2n_connection.h"
#include "tls/s2n_crypto.h"
#include "tls/s2n_tls.h"
#include "tls/s2n_tls_parameters.h"
#include "utils/s2n_safety.h"
#include "s2n_test.h"
#include "testlib/s2n_testlib.h"
static char *cert_chain, *private_key;
struct s2n_cert_chain_and_key *default_cert;
int s2n_fuzz_init(int *argc, char **argv[])
{
/* Initialize test chain and key */
cert_chain = malloc(S2N_MAX_TEST_PEM_SIZE);
POSIX_ENSURE_REF(cert_chain);
private_key = malloc(S2N_MAX_TEST_PEM_SIZE);
POSIX_ENSURE_REF(private_key);
default_cert = s2n_cert_chain_and_key_new();
POSIX_ENSURE_REF(default_cert);
POSIX_GUARD(s2n_read_test_pem(S2N_DEFAULT_TEST_CERT_CHAIN, cert_chain, S2N_MAX_TEST_PEM_SIZE));
POSIX_GUARD(s2n_read_test_pem(S2N_DEFAULT_TEST_PRIVATE_KEY, private_key, S2N_MAX_TEST_PEM_SIZE));
POSIX_GUARD(s2n_cert_chain_and_key_load_pem(default_cert, cert_chain, private_key));
return S2N_SUCCESS;
}
static const uint8_t TLS_VERSIONS[] = {S2N_TLS10, S2N_TLS11, S2N_TLS12};
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_connection *client_conn = s2n_connection_new(S2N_CLIENT);
POSIX_ENSURE_REF(client_conn);
struct s2n_config *client_config = s2n_config_new();
POSIX_ENSURE_REF(client_config);
POSIX_GUARD(s2n_config_add_cert_chain_and_key_to_store(client_config, default_cert));
POSIX_GUARD(s2n_connection_set_config(client_conn, client_config));
POSIX_GUARD(s2n_stuffer_write_bytes(&client_conn->handshake.io, buf, len));
/* Pull a byte off the libfuzzer input and use it to set parameters */
uint8_t randval = 0;
POSIX_GUARD(s2n_stuffer_read_uint8(&client_conn->handshake.io, &randval));
client_conn->actual_protocol_version = TLS_VERSIONS[randval % s2n_array_len(TLS_VERSIONS)];
/* Run Test
* Do not use GUARD macro here since the connection memory hasn't been freed.
*/
s2n_cert_req_recv(client_conn);
/* Cleanup */
POSIX_GUARD(s2n_connection_free(client_conn));
POSIX_GUARD(s2n_config_free(client_config));
return S2N_SUCCESS;
}
static void s2n_fuzz_cleanup()
{
free(cert_chain);
free(private_key);
s2n_cert_chain_and_key_free(default_cert);
}
S2N_FUZZ_TARGET(s2n_fuzz_init, s2n_fuzz_test, s2n_fuzz_cleanup)
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