fuzz/dtlsclient.c

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