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) { 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) 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 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(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 } 104 105 void FuzzerCleanup(void) 106 { 107 FuzzerClearRand(); 108 } 109