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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.
*/
#define _GNU_SOURCE
#include <dlfcn.h>
#include <openssl/rsa.h>
#include <time.h>
#include "crypto/s2n_rsa.h"
#include "error/s2n_errno.h"
#include "tls/s2n_connection.h"
#include "utils/s2n_safety.h"
time_t time (time_t *__timer)
{
/* Always assume the time is zero when fuzzing the server, this is to ensure that Fuzz tests are deterministic and
* don't depend on the time the test was run.
*/
return 0;
}
int RSA_verify(int dtype, const unsigned char *m, unsigned int m_len,
const unsigned char *sigbuf, unsigned int siglen, RSA *rsa)
{
/* Always assume that the RSA_verify function passes */
return 1;
}
bool s2n_constant_time_equals(const uint8_t *a, const uint8_t *b, uint32_t len)
{
/* Allow all signatures checked with s2n_constant_time_equals to always pass verification even if they are invalid
* in order to aid code coverage with server fuzz test.
*/
return 1;
}
int s2n_rsa_client_key_recv(struct s2n_connection *conn, struct s2n_blob *shared_key)
{
/* Perform the original function */
typedef int (*orig_s2n_rsa_client_key_recv_func_type)(struct s2n_connection *conn, struct s2n_blob *shared_key);
orig_s2n_rsa_client_key_recv_func_type orig_s2n_rsa_client_key_recv;
orig_s2n_rsa_client_key_recv = (orig_s2n_rsa_client_key_recv_func_type) dlsym(RTLD_NEXT, "s2n_rsa_client_key_recv");
int original_return_code = orig_s2n_rsa_client_key_recv(conn, shared_key);
/* Then, overwrite the RSA Failed flag to false before returning, this will help fuzzing code coverage. */
conn->handshake.rsa_failed = 0;
return original_return_code;
}
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