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// 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 <fuzzer/FuzzedDataProvider.h>
#include "base/logging.h"
#include "net/cookies/parsed_cookie.h"
const std::string GetArbitraryString(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) {
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. Should not call
// anything other than SetName/SetValue when !IsValid().
const uint8_t action = data_provider.ConsumeIntegralInRange(0, 10);
switch (action) {
case 1:
parsed_cookie.SetName(GetArbitraryString(&data_provider));
break;
case 2:
parsed_cookie.SetValue(GetArbitraryString(&data_provider));
break;
}
if (parsed_cookie.IsValid()) {
switch (action) {
case 3:
if (parsed_cookie.IsValid())
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();
// RFC6265 requires semicolons to be followed by spaces. Because our parser
// permits this rule to be broken, but follows the rule in ToCookieLine(),
// it's possible to serialize a string that's longer than the original
// input. If the serialized string exceeds kMaxCookieSize, the parser will
// reject it. For this fuzzer, we are considering this situation a false
// positive.
if (serialized.size() <= net::ParsedCookie::kMaxCookieSize) {
CHECK(reparsed_cookie.IsValid());
CHECK_EQ(serialized, reserialized);
}
}
return 0;
}
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