fuzz/client.c

   1 /*
   2  * Copyright 2016-2020 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 #include "rand.inc"
  22
  23 DEFINE_STACK_OF(SSL_COMP)
  24
  25 /* unused, to avoid warning. */
  26 static int idx;
  27
  28 #define FUZZTIME 1485898104
  29
  30 #define TIME_IMPL(t) { if (t != NULL) *t = FUZZTIME; return FUZZTIME; }
  31
  32 /*
  33  * This might not work in all cases (and definitely not on Windows
  34  * because of the way linkers are) and callees can still get the
  35  * current time instead of the fixed time. This will just result
  36  * in things not being fully reproducible and have a slightly
  37  * different coverage.
  38  */
  39 #if !defined(_WIN32)
  40 time_t time(time_t *t) TIME_IMPL(t)
  41 #endif
  42
  43 int FuzzerInitialize(int *argc, char ***argv)
  44 {
  45     STACK_OF(SSL_COMP) *comp_methods;
  46
  47     OPENSSL_init_crypto(OPENSSL_INIT_LOAD_CRYPTO_STRINGS | OPENSSL_INIT_ASYNC, NULL);
  48     OPENSSL_init_ssl(OPENSSL_INIT_LOAD_SSL_STRINGS, NULL);
  49     ERR_clear_error();
  50     CRYPTO_free_ex_index(0, -1);
  51     idx = SSL_get_ex_data_X509_STORE_CTX_idx();
  52     FuzzerSetRand();
  53     comp_methods = SSL_COMP_get_compression_methods();
  54     if (comp_methods != NULL)
  55         sk_SSL_COMP_sort(comp_methods);
  56
  57     return 1;
  58 }
  59
  60 int FuzzerTestOneInput(const uint8_t *buf, size_t len)
  61 {
  62     SSL *client;
  63     BIO *in;
  64     BIO *out;
  65     SSL_CTX *ctx;
  66
  67     if (len == 0)
  68         return 0;
  69
  70     /*
  71      * TODO: use the ossltest engine (optionally?) to disable crypto checks.
  72      */
  73
  74     /* This only fuzzes the initial flow from the client so far. */
  75     ctx = SSL_CTX_new(SSLv23_method());
  76
  77     client = SSL_new(ctx);
  78     OPENSSL_assert(SSL_set_min_proto_version(client, 0) == 1);
  79     OPENSSL_assert(SSL_set_cipher_list(client, "ALL:eNULL:@SECLEVEL=0") == 1);
  80     SSL_set_tlsext_host_name(client, "localhost");
  81     in = BIO_new(BIO_s_mem());
  82     out = BIO_new(BIO_s_mem());
  83     SSL_set_bio(client, in, out);
  84     SSL_set_connect_state(client);
  85     OPENSSL_assert((size_t)BIO_write(in, buf, len) == len);
  86     if (SSL_do_handshake(client) == 1) {
  87         /* Keep reading application data until error or EOF. */
  88         uint8_t tmp[1024];
  89         for (;;) {
  90             if (SSL_read(client, tmp, sizeof(tmp)) <= 0) {
  91                 break;
  92             }
  93         }
  94     }
  95     SSL_free(client);
  96     ERR_clear_error();
  97     SSL_CTX_free(ctx);
  98
  99     return 0;
 100 }
 101
 102 void FuzzerCleanup(void)
 103 {
 104 }