1  // Copyright (c) 2020-2022 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  
13  #include <cstdint>
14  #include <string>
15  #include <vector>
16  
17  extern std::chrono::milliseconds g_socks5_recv_timeout;
18  
19  namespace {
20  decltype(g_socks5_recv_timeout) default_socks5_recv_timeout;
21  };
22  
23  void initialize_socks5()
24  {
25      static const auto testing_setup = MakeNoLogFileContext<const BasicTestingSetup>();
26      default_socks5_recv_timeout = g_socks5_recv_timeout;
27  }
28  
29  FUZZ_TARGET(socks5, .init = initialize_socks5)
30  {
31      FuzzedDataProvider fuzzed_data_provider{buffer.data(), buffer.size()};
32      ProxyCredentials proxy_credentials;
33      proxy_credentials.username = fuzzed_data_provider.ConsumeRandomLengthString(512);
34      proxy_credentials.password = fuzzed_data_provider.ConsumeRandomLengthString(512);
35      if (fuzzed_data_provider.ConsumeBool()) {
36          g_socks5_interrupt();
37      }
38      // Set FUZZED_SOCKET_FAKE_LATENCY=1 to exercise recv timeout code paths. This
39      // will slow down fuzzing.
40      g_socks5_recv_timeout = (fuzzed_data_provider.ConsumeBool() && std::getenv("FUZZED_SOCKET_FAKE_LATENCY") != nullptr) ? 1ms : default_socks5_recv_timeout;
41      FuzzedSock fuzzed_sock = ConsumeSock(fuzzed_data_provider);
42      // This Socks5(...) fuzzing harness would have caught CVE-2017-18350 within
43      // a few seconds of fuzzing.
44      (void)Socks5(fuzzed_data_provider.ConsumeRandomLengthString(512),
45                   fuzzed_data_provider.ConsumeIntegral<uint16_t>(),
46                   fuzzed_data_provider.ConsumeBool() ? &proxy_credentials : nullptr,
47                   fuzzed_sock);
48  }