socks5.cpp raw

   1  // Copyright (c) 2020-2022 The Limenka 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  }
  51