Home | History | Annotate | Line # | Download | only in fuzz
client.c revision 1.1.1.1.14.1 
      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