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      1 /*
      2  * Copyright 2016-2018 The OpenSSL Project Authors. All Rights Reserved.
      3  *
      4  * Licensed under the OpenSSL licenses, (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 #include "rand.inc"
     22 
     23 /* unused, to avoid warning. */
     24 static int idx;
     25 
     26 #define FUZZTIME 1485898104
     27 
     28 #define TIME_IMPL(t) { if (t != NULL) *t = FUZZTIME; return FUZZTIME; }
     29 
     30 /*
     31  * This might not work in all cases (and definitely not on Windows
     32  * because of the way linkers are) and callees can still get the
     33  * current time instead of the fixed time. This will just result
     34  * in things not being fully reproducible and have a slightly
     35  * different coverage.
     36  */
     37 #if !defined(_WIN32)
     38 time_t time(time_t *t) TIME_IMPL(t)
     39 #endif
     40 
     41 int FuzzerInitialize(int *argc, char ***argv)
     42 {
     43     STACK_OF(SSL_COMP) *comp_methods;
     44 
     45     OPENSSL_init_crypto(OPENSSL_INIT_LOAD_CRYPTO_STRINGS | OPENSSL_INIT_ASYNC, NULL);
     46     OPENSSL_init_ssl(OPENSSL_INIT_LOAD_SSL_STRINGS, NULL);
     47     ERR_get_state();
     48     CRYPTO_free_ex_index(0, -1);
     49     idx = SSL_get_ex_data_X509_STORE_CTX_idx();
     50     FuzzerSetRand();
     51     comp_methods = SSL_COMP_get_compression_methods();
     52     if (comp_methods != NULL)
     53         sk_SSL_COMP_sort(comp_methods);
     54 
     55     return 1;
     56 }
     57 
     58 int FuzzerTestOneInput(const uint8_t *buf, size_t len)
     59 {
     60     SSL *client;
     61     BIO *in;
     62     BIO *out;
     63     SSL_CTX *ctx;
     64 
     65     if (len == 0)
     66         return 0;
     67 
     68     /*
     69      * TODO: use the ossltest engine (optionally?) to disable crypto checks.
     70      */
     71 
     72     /* This only fuzzes the initial flow from the client so far. */
     73     ctx = SSL_CTX_new(SSLv23_method());
     74 
     75     client = SSL_new(ctx);
     76     OPENSSL_assert(SSL_set_min_proto_version(client, 0) == 1);
     77     OPENSSL_assert(SSL_set_cipher_list(client, "ALL:eNULL:@SECLEVEL=0") == 1);
     78     SSL_set_tlsext_host_name(client, "localhost");
     79     in = BIO_new(BIO_s_mem());
     80     out = BIO_new(BIO_s_mem());
     81     SSL_set_bio(client, in, out);
     82     SSL_set_connect_state(client);
     83     OPENSSL_assert((size_t)BIO_write(in, buf, len) == len);
     84     if (SSL_do_handshake(client) == 1) {
     85         /* Keep reading application data until error or EOF. */
     86         uint8_t tmp[1024];
     87         for (;;) {
     88             if (SSL_read(client, tmp, sizeof(tmp)) <= 0) {
     89                 break;
     90             }
     91         }
     92     }
     93     SSL_free(client);
     94     ERR_clear_error();
     95     SSL_CTX_free(ctx);
     96 
     97     return 0;
     98 }
     99 
    100 void FuzzerCleanup(void)
    101 {
    102 }
    103