1/*
2 * Copyright 2016-2022 The OpenSSL Project Authors. All Rights Reserved.
3 *
4 * Licensed under the Apache License 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 * https://www.openssl.org/source/license.html
8 * or in the file LICENSE in the source distribution.
9 */
10
11#include <time.h>
12#include <openssl/rand.h>
13#include <openssl/ssl.h>
14#include <openssl/rsa.h>
15#include <openssl/dsa.h>
16#include <openssl/ec.h>
17#include <openssl/dh.h>
18#include <openssl/err.h>
19#include "fuzzer.h"
20
21/* unused, to avoid warning. */
22static int idx;
23
24#define FUZZTIME 1485898104
25
26#define TIME_IMPL(t) { if (t != NULL) *t = FUZZTIME; return FUZZTIME; }
27
28/*
29 * This might not work in all cases (and definitely not on Windows
30 * because of the way linkers are) and callees can still get the
31 * current time instead of the fixed time. This will just result
32 * in things not being fully reproducible and have a slightly
33 * different coverage.
34 */
35#if !defined(_WIN32)
36time_t time(time_t *t) TIME_IMPL(t)
37#endif
38
39int FuzzerInitialize(int *argc, char ***argv)
40{
41    STACK_OF(SSL_COMP) *comp_methods;
42
43    FuzzerSetRand();
44    OPENSSL_init_crypto(OPENSSL_INIT_LOAD_CRYPTO_STRINGS | OPENSSL_INIT_ASYNC, NULL);
45    OPENSSL_init_ssl(OPENSSL_INIT_LOAD_SSL_STRINGS, NULL);
46    ERR_clear_error();
47    CRYPTO_free_ex_index(0, -1);
48    idx = SSL_get_ex_data_X509_STORE_CTX_idx();
49    comp_methods = SSL_COMP_get_compression_methods();
50    if (comp_methods != NULL)
51        sk_SSL_COMP_sort(comp_methods);
52
53    return 1;
54}
55
56int FuzzerTestOneInput(const uint8_t *buf, size_t len)
57{
58    SSL *client = NULL;
59    BIO *in;
60    BIO *out;
61    SSL_CTX *ctx;
62
63    if (len == 0)
64        return 0;
65
66    /* This only fuzzes the initial flow from the client so far. */
67    ctx = SSL_CTX_new(SSLv23_method());
68    if (ctx == NULL)
69        goto end;
70
71    client = SSL_new(ctx);
72    if (client == NULL)
73        goto end;
74    OPENSSL_assert(SSL_set_min_proto_version(client, 0) == 1);
75    OPENSSL_assert(SSL_set_cipher_list(client, "ALL:eNULL:@SECLEVEL=0") == 1);
76    SSL_set_tlsext_host_name(client, "localhost");
77    in = BIO_new(BIO_s_mem());
78    if (in == NULL)
79        goto end;
80    out = BIO_new(BIO_s_mem());
81    if (out == NULL) {
82        BIO_free(in);
83        goto end;
84    }
85    SSL_set_bio(client, in, out);
86    SSL_set_connect_state(client);
87    OPENSSL_assert((size_t)BIO_write(in, buf, len) == len);
88    if (SSL_do_handshake(client) == 1) {
89        /* Keep reading application data until error or EOF. */
90        uint8_t tmp[1024];
91        for (;;) {
92            if (SSL_read(client, tmp, sizeof(tmp)) <= 0) {
93                break;
94            }
95        }
96    }
97 end:
98    SSL_free(client);
99    ERR_clear_error();
100    SSL_CTX_free(ctx);
101
102    return 0;
103}
104
105void FuzzerCleanup(void)
106{
107    FuzzerClearRand();
108}
109