1 /*
2 * Copyright 2016-2024 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) { 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)
time(time_t * t)36 time_t time(time_t *t) TIME_IMPL(t)
37 #endif
38
39 int 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
FuzzerTestOneInput(const uint8_t * buf,size_t len)56 int 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(DTLS_client_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
FuzzerCleanup(void)105 void FuzzerCleanup(void)
106 {
107 FuzzerClearRand();
108 }
109
