socks5.cpp raw

   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 <test/util/time.h>
  13  #include <util/time.h>
  14  
  15  #include <cstdint>
  16  #include <string>
  17  #include <vector>
  18  
  19  extern std::chrono::milliseconds g_socks5_recv_timeout;
  20  
  21  namespace {
  22  decltype(g_socks5_recv_timeout) default_socks5_recv_timeout;
  23  };
  24  
  25  void initialize_socks5()
  26  {
  27      static const auto testing_setup = MakeNoLogFileContext<const BasicTestingSetup>();
  28      default_socks5_recv_timeout = g_socks5_recv_timeout;
  29  }
  30  
  31  FUZZ_TARGET(socks5, .init = initialize_socks5)
  32  {
  33      FuzzedDataProvider fuzzed_data_provider{buffer.data(), buffer.size()};
  34      FakeNodeClock clock{ConsumeTime(fuzzed_data_provider)};
  35      FakeSteadyClock steady_clock;
  36      ProxyCredentials proxy_credentials;
  37      proxy_credentials.username = fuzzed_data_provider.ConsumeRandomLengthString(512);
  38      proxy_credentials.password = fuzzed_data_provider.ConsumeRandomLengthString(512);
  39      if (fuzzed_data_provider.ConsumeBool()) {
  40          g_socks5_interrupt();
  41      }
  42      // Set FUZZED_SOCKET_FAKE_LATENCY=1 to exercise recv timeout code paths. This
  43      // will slow down fuzzing.
  44      g_socks5_recv_timeout = (fuzzed_data_provider.ConsumeBool() && std::getenv("FUZZED_SOCKET_FAKE_LATENCY") != nullptr) ? 1ms : default_socks5_recv_timeout;
  45      FuzzedSock fuzzed_sock = ConsumeSock(fuzzed_data_provider, steady_clock);
  46      // This Socks5(...) fuzzing harness would have caught CVE-2017-18350 within
  47      // a few seconds of fuzzing.
  48      auto str_dest = fuzzed_data_provider.ConsumeRandomLengthString(512);
  49      auto port = fuzzed_data_provider.ConsumeIntegral<uint16_t>();
  50      auto* auth = fuzzed_data_provider.ConsumeBool() ? &proxy_credentials : nullptr;
  51      (void)Socks5(str_dest, port, auth, fuzzed_sock);
  52  }
  53