net/cookies/parse_cookie_line_fuzzer.cc

// Copyright 2016 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include <stddef.h>
#include <stdint.h>

#include "base/logging.h"
#include "base/test/fuzzed_data_provider.h"
#include "net/cookies/parsed_cookie.h"

const std::string GetArbitraryString(base::FuzzedDataProvider* data_provider) {
  // Adding a fudge factor to kMaxCookieSize so that both branches of the bounds
  // detection code will be tested.
  return data_provider->ConsumeRandomLengthString(
      net::ParsedCookie::kMaxCookieSize + 10);
}

// Entry point for LibFuzzer.
extern "C" int LLVMFuzzerTestOneInput(const uint8_t* data, size_t size) {
  base::FuzzedDataProvider data_provider(data, size);
  const std::string cookie_line = GetArbitraryString(&data_provider);
  net::ParsedCookie parsed_cookie(cookie_line);

  // Call zero or one of ParsedCookie's mutator methods.
  switch (data_provider.ConsumeIntegralInRange(0, 10)) {
    case 0:
      break;
    case 1:
      parsed_cookie.SetName(GetArbitraryString(&data_provider));
      break;
    case 2:
      parsed_cookie.SetValue(GetArbitraryString(&data_provider));
      break;
    case 3:
      parsed_cookie.SetPath(GetArbitraryString(&data_provider));
      break;
    case 4:
      parsed_cookie.SetDomain(GetArbitraryString(&data_provider));
      break;
    case 5:
      parsed_cookie.SetExpires(GetArbitraryString(&data_provider));
      break;
    case 6:
      parsed_cookie.SetMaxAge(GetArbitraryString(&data_provider));
      break;
    case 7:
      parsed_cookie.SetIsSecure(data_provider.ConsumeBool());
      break;
    case 8:
      parsed_cookie.SetIsHttpOnly(data_provider.ConsumeBool());
      break;
    case 9:
      parsed_cookie.SetSameSite(GetArbitraryString(&data_provider));
      break;
    case 10:
      parsed_cookie.SetPriority(GetArbitraryString(&data_provider));
      break;
  }

  // Check that serialize/deserialize inverse property holds for valid cookies.
  if (parsed_cookie.IsValid()) {
    const std::string serialized = parsed_cookie.ToCookieLine();
    net::ParsedCookie reparsed_cookie(serialized);
    const std::string reserialized = reparsed_cookie.ToCookieLine();
    CHECK(reparsed_cookie.IsValid());
    CHECK_EQ(serialized, reserialized);
  }

  return 0;
}