Add fuzz testing using american fuzzy lop

Existing tests: block, transaction, signature, cold outputs,
cold transaction.

Data for these is in tests/data/fuzz.

A convenience shell script is in contrib/fuzz_testing/fuzz.sh, eg:

contrib/fuzz_testing/fuzz.sh signature

The fuzzer will run indefinitely, ^C to stop.

Fuzzing is currently supported for GCC only. I can't get CLANG
to build Monero here as it dies on some system headers, so if
someone wants to make it work on both, that'd be great.
In particular, the __AFL_LOOP construct should be made to work
so that a given run can fuzz multiple inputs, as the C++ load
time is substantial.

1 files changed, 105 insertions, 0 deletions

diff --git a/tests/fuzz/signature.cpp b/tests/fuzz/signature.cpp
new file mode 100644
index 000000000..69d0ad25b
--- /dev/null
+++ b/tests/fuzz/signature.cpp
@@ -0,0 +1,105 @@
+// Copyright (c) 2017, The Monero Project
+// 
+// All rights reserved.
+// 
+// Redistribution and use in source and binary forms, with or without modification, are
+// permitted provided that the following conditions are met:
+// 
+// 1. Redistributions of source code must retain the above copyright notice, this list of
+//    conditions and the following disclaimer.
+// 
+// 2. Redistributions in binary form must reproduce the above copyright notice, this list
+//    of conditions and the following disclaimer in the documentation and/or other
+//    materials provided with the distribution.
+// 
+// 3. Neither the name of the copyright holder nor the names of its contributors may be
+//    used to endorse or promote products derived from this software without specific
+//    prior written permission.
+// 
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY
+// EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+// MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
+// THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+// PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+// STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
+// THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+#include "include_base_utils.h"
+#include "common/command_line.h"
+#include "file_io_utils.h"
+#include "cryptonote_protocol/blobdatatype.h"
+#include "cryptonote_basic/cryptonote_basic.h"
+#include "cryptonote_basic/cryptonote_format_utils.h"
+#include "wallet/wallet2.h"
+#include "fuzzer.h"
+
+class SignatureFuzzer: public Fuzzer
+{
+public:
+  SignatureFuzzer(): Fuzzer(), wallet(true) {}
+  virtual int init();
+  virtual int run(const std::string &filename);
+
+private:
+  tools::wallet2 wallet;
+  cryptonote::account_public_address address;
+};
+
+int SignatureFuzzer::init()
+{
+  static const char * const spendkey_hex = "0b4f47697ec99c3de6579304e5f25c68b07afbe55b71d99620bf6cbf4e45a80f";
+  crypto::secret_key spendkey;
+  epee::string_tools::hex_to_pod(spendkey_hex, spendkey);
+
+  try
+  {
+    boost::filesystem::remove("/tmp/signature-test.keys");
+    boost::filesystem::remove("/tmp/signature-test.address.txt");
+    boost::filesystem::remove("/tmp/signature-test");
+
+    wallet.init("");
+    wallet.generate("/tmp/signature-test", "", spendkey, true, false);
+
+    boost::filesystem::remove("/tmp/signature-test.keys");
+    boost::filesystem::remove("/tmp/signature-test.address.txt");
+    boost::filesystem::remove("/tmp/signature-test");
+
+    bool has_payment_id;
+    crypto::hash8 new_payment_id;
+    if (!cryptonote::get_account_address_from_str_or_url(address, has_payment_id, new_payment_id, true, "9uVsvEryzpN8WH2t1WWhFFCG5tS8cBNdmJYNRuckLENFimfauV5pZKeS1P2CbxGkSDTUPHXWwiYE5ZGSXDAGbaZgDxobqDN"))
+    {
+      std::cerr << "failed to parse address" << std::endl;
+      return 1;
+    }
+  }
+  catch (const std::exception &e)
+  {
+    std::cerr << "Error on SignatureFuzzer::init: " << e.what() << std::endl;
+    return 1;
+  }
+  return 0;
+}
+
+int SignatureFuzzer::run(const std::string &filename)
+{
+  std::string s;
+
+  if (!epee::file_io_utils::load_file_to_string(filename, s))
+  {
+    std::cout << "Error: failed to load file " << filename << std::endl;
+    return 1;
+  }
+
+  bool valid = wallet.verify("test", address, s);
+  std::cout << "Signature " << (valid ? "valid" : "invalid") << std::endl;
+
+  return 0;
+}
+
+int main(int argc, const char **argv)
+{
+  SignatureFuzzer fuzzer;
+  return run_fuzzer(argc, argv, fuzzer);
+}