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. */
22 static int idx;
23
24 #define FUZZTIME 1485898104
25
26 #define TIME_IMPL(t) \
27 { \
28 if (t != NULL) \
29 *t = FUZZTIME; \
30 return FUZZTIME; \
31 }
32
33 /*
34 * This might not work in all cases (and definitely not on Windows
35 * because of the way linkers are) and callees can still get the
36 * current time instead of the fixed time. This will just result
37 * in things not being fully reproducible and have a slightly
38 * different coverage.
39 */
40 #if !defined(_WIN32)
time(time_t * t)41 time_t time(time_t *t) TIME_IMPL(t)
42 #endif
43
44 int FuzzerInitialize(int *argc, char ***argv)
45 {
46 STACK_OF(SSL_COMP) *comp_methods;
47
48 FuzzerSetRand();
49 OPENSSL_init_crypto(OPENSSL_INIT_LOAD_CRYPTO_STRINGS | OPENSSL_INIT_ASYNC, NULL);
50 OPENSSL_init_ssl(OPENSSL_INIT_LOAD_SSL_STRINGS, NULL);
51 ERR_clear_error();
52 CRYPTO_free_ex_index(0, -1);
53 idx = SSL_get_ex_data_X509_STORE_CTX_idx();
54 comp_methods = SSL_COMP_get_compression_methods();
55 if (comp_methods != NULL)
56 sk_SSL_COMP_sort(comp_methods);
57
58 return 1;
59 }
60
FuzzerTestOneInput(const uint8_t * buf,size_t len)61 int FuzzerTestOneInput(const uint8_t *buf, size_t len)
62 {
63 SSL *client = NULL;
64 BIO *in;
65 BIO *out;
66 SSL_CTX *ctx;
67
68 if (len == 0)
69 return 0;
70
71 /* This only fuzzes the initial flow from the client so far. */
72 ctx = SSL_CTX_new(SSLv23_method());
73 if (ctx == NULL)
74 goto end;
75
76 client = SSL_new(ctx);
77 if (client == NULL)
78 goto end;
79 OPENSSL_assert(SSL_set_min_proto_version(client, 0) == 1);
80 OPENSSL_assert(SSL_set_cipher_list(client, "ALL:eNULL:@SECLEVEL=0") == 1);
81 SSL_set_tlsext_host_name(client, "localhost");
82 in = BIO_new(BIO_s_mem());
83 if (in == NULL)
84 goto end;
85 out = BIO_new(BIO_s_mem());
86 if (out == NULL) {
87 BIO_free(in);
88 goto end;
89 }
90 SSL_set_bio(client, in, out);
91 SSL_set_connect_state(client);
92 OPENSSL_assert((size_t)BIO_write(in, buf, len) == len);
93 if (SSL_do_handshake(client) == 1) {
94 /* Keep reading application data until error or EOF. */
95 uint8_t tmp[1024];
96 for (;;) {
97 if (SSL_read(client, tmp, sizeof(tmp)) <= 0) {
98 break;
99 }
100 }
101 }
102 end:
103 SSL_free(client);
104 ERR_clear_error();
105 SSL_CTX_free(ctx);
106
107 return 0;
108 }
109
FuzzerCleanup(void)110 void FuzzerCleanup(void)
111 {
112 FuzzerClearRand();
113 }
114