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      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)
     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 
     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 
    110 void FuzzerCleanup(void)
    111 {
    112     FuzzerClearRand();
    113 }
    114