1  // Copyright (c) 2020-present The Bitcoin Core developers
 2  // Distributed under the MIT software license, see the accompanying
 3  // file COPYING or http://www.opensource.org/licenses/mit-license.php.
 4  
 5  #include <netaddress.h>
 6  #include <netbase.h>
 7  #include <test/fuzz/FuzzedDataProvider.h>
 8  #include <test/fuzz/fuzz.h>
 9  #include <test/fuzz/util.h>
10  #include <test/fuzz/util/net.h>
11  #include <test/util/setup_common.h>
12  #include <util/time.h>
13  
14  #include <cstdint>
15  #include <string>
16  #include <vector>
17  
18  extern std::chrono::milliseconds g_socks5_recv_timeout;
19  
20  namespace {
21  decltype(g_socks5_recv_timeout) default_socks5_recv_timeout;
22  };
23  
24  void initialize_socks5()
25  {
26      static const auto testing_setup = MakeNoLogFileContext<const BasicTestingSetup>();
27      default_socks5_recv_timeout = g_socks5_recv_timeout;
28  }
29  
30  FUZZ_TARGET(socks5, .init = initialize_socks5)
31  {
32      FuzzedDataProvider fuzzed_data_provider{buffer.data(), buffer.size()};
33      SetMockTime(ConsumeTime(fuzzed_data_provider));
34      ProxyCredentials proxy_credentials;
35      proxy_credentials.username = fuzzed_data_provider.ConsumeRandomLengthString(512);
36      proxy_credentials.password = fuzzed_data_provider.ConsumeRandomLengthString(512);
37      if (fuzzed_data_provider.ConsumeBool()) {
38          g_socks5_interrupt();
39      }
40      // Set FUZZED_SOCKET_FAKE_LATENCY=1 to exercise recv timeout code paths. This
41      // will slow down fuzzing.
42      g_socks5_recv_timeout = (fuzzed_data_provider.ConsumeBool() && std::getenv("FUZZED_SOCKET_FAKE_LATENCY") != nullptr) ? 1ms : default_socks5_recv_timeout;
43      FuzzedSock fuzzed_sock = ConsumeSock(fuzzed_data_provider);
44      // This Socks5(...) fuzzing harness would have caught CVE-2017-18350 within
45      // a few seconds of fuzzing.
46      auto str_dest = fuzzed_data_provider.ConsumeRandomLengthString(512);
47      auto port = fuzzed_data_provider.ConsumeIntegral<uint16_t>();
48      auto* auth = fuzzed_data_provider.ConsumeBool() ? &proxy_credentials : nullptr;
49      (void)Socks5(str_dest, port, auth, fuzzed_sock);
50  }