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b12ae4a912
Approach was opportunistic in Windows context from its inception and on top of that it was proven to be error-prone at link stage. Correct answer is to introduce library-specific time function that we can control in platform-neutral manner. Meanwhile we just let be attempts to override time on Windows. Reviewed-by: Matt Caswell <matt@openssl.org> (Merged from https://github.com/openssl/openssl/pull/3320)
110 lines
2.8 KiB
C
110 lines
2.8 KiB
C
/*
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* Copyright 2016 The OpenSSL Project Authors. All Rights Reserved.
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*
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* Licensed under the OpenSSL licenses, (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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* https://www.openssl.org/source/license.html
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* or in the file LICENSE in the source distribution.
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*/
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#include <time.h>
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#include <openssl/rand.h>
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#include <openssl/ssl.h>
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#include <openssl/rsa.h>
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#include <openssl/dsa.h>
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#include <openssl/ec.h>
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#include <openssl/dh.h>
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#include <openssl/err.h>
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#include "fuzzer.h"
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#ifdef FUZZING_BUILD_MODE_UNSAFE_FOR_PRODUCTION
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extern int rand_predictable;
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#endif
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#define ENTROPY_NEEDED 32
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/* unused, to avoid warning. */
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static int idx;
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#define FUZZTIME 1485898104
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#define TIME_IMPL(t) { if (t != NULL) *t = FUZZTIME; return FUZZTIME; }
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/*
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* This might not work in all cases (and definitely not on Windows
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* because of the way linkers are) and callees can still get the
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* current time instead of the fixed time. This will just result
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* in things not being fully reproducible and have a slightly
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* different coverage.
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*/
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#if !defined(_WIN32)
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time_t time(time_t *t) TIME_IMPL(t)
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#endif
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int FuzzerInitialize(int *argc, char ***argv)
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{
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STACK_OF(SSL_COMP) *comp_methods;
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OPENSSL_init_crypto(OPENSSL_INIT_LOAD_CRYPTO_STRINGS | OPENSSL_INIT_ASYNC, NULL);
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OPENSSL_init_ssl(OPENSSL_INIT_LOAD_SSL_STRINGS, NULL);
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ERR_get_state();
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CRYPTO_free_ex_index(0, -1);
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idx = SSL_get_ex_data_X509_STORE_CTX_idx();
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RAND_add("", 1, ENTROPY_NEEDED);
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RAND_status();
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comp_methods = SSL_COMP_get_compression_methods();
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OPENSSL_sk_sort((OPENSSL_STACK *)comp_methods);
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#ifdef FUZZING_BUILD_MODE_UNSAFE_FOR_PRODUCTION
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rand_predictable = 1;
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#endif
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return 1;
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}
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int FuzzerTestOneInput(const uint8_t *buf, size_t len)
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{
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SSL *client;
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BIO *in;
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BIO *out;
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SSL_CTX *ctx;
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if (len == 0)
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return 0;
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/*
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* TODO: use the ossltest engine (optionally?) to disable crypto checks.
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*/
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/* This only fuzzes the initial flow from the client so far. */
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ctx = SSL_CTX_new(SSLv23_method());
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client = SSL_new(ctx);
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OPENSSL_assert(SSL_set_cipher_list(client, "ALL:eNULL:@SECLEVEL=0") == 1);
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SSL_set_tlsext_host_name(client, "localhost");
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in = BIO_new(BIO_s_mem());
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out = BIO_new(BIO_s_mem());
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SSL_set_bio(client, in, out);
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SSL_set_connect_state(client);
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OPENSSL_assert((size_t)BIO_write(in, buf, len) == len);
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if (SSL_do_handshake(client) == 1) {
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/* Keep reading application data until error or EOF. */
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uint8_t tmp[1024];
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for (;;) {
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if (SSL_read(client, tmp, sizeof(tmp)) <= 0) {
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break;
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}
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}
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}
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SSL_free(client);
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ERR_clear_error();
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SSL_CTX_free(ctx);
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return 0;
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}
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void FuzzerCleanup(void)
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{
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}
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