android/fuzzer/policy_timers_fuzzer.cpp

/*
 * Copyright (C) 2023 The Android Open Source Project
 *
 * Licensed under the Apache license, Version 2.0 (the "license");
 * you may not use this file except in compliance with the license.
 * You may obtain a copy of the license at:
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the license is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the license for the specific language governing permissions and
 * limitations under the license.
 *
 */

#include <fuzzer/FuzzedDataProvider.h>

#include "policy_timers.h"
#include "policy_timers_v16.h"
#include "policy_timers_v18.h"
#include "wv_cdm_event_listener.h"

using namespace wvcdm;
using namespace video_widevine;

class PolicyTimersFuzzer {
 public:
  PolicyTimersFuzzer(const uint8_t* data, size_t size) : fdp_(data, size){};
  void Process();

 private:
  FuzzedDataProvider fdp_;
  License license_;
  void SetUp();
};

void PolicySetBool(std::function<void(bool)> function,
                   FuzzedDataProvider* fdp) {
  if (fdp->ConsumeBool()) {
    function(fdp->ConsumeBool());
  }
}
void PolicySetInt64(std::function<void(int64_t)> function,
                    FuzzedDataProvider* fdp) {
  if (fdp->ConsumeBool()) {
    function(fdp->ConsumeIntegral<int64_t>());
  }
}

void PolicyTimersFuzzer::SetUp() {
  License_Policy* policy = license_.mutable_policy();
  PolicySetBool(
      std::bind(&License_Policy::set_can_renew, policy, std::placeholders::_1),
      &fdp_);
  PolicySetInt64(std::bind(&License_Policy::set_renewal_delay_seconds, policy,
                           std::placeholders::_1),
                 &fdp_);
  PolicySetBool(std::bind(&License_Policy::set_soft_enforce_playback_duration,
                          policy, std::placeholders::_1),
                &fdp_);
  PolicySetInt64(std::bind(&License_Policy::set_renewal_retry_interval_seconds,
                           policy, std::placeholders::_1),
                 &fdp_);
  PolicySetInt64(std::bind(&License_Policy::set_license_duration_seconds,
                           policy, std::placeholders::_1),
                 &fdp_);
  if (fdp_.ConsumeBool()) {
    video_widevine::License::Policy::TimerDelayBase time_delay_base =
        (video_widevine::License::Policy::TimerDelayBase)
            fdp_.ConsumeIntegralInRange<uint8_t>(
                License_Policy_TimerDelayBase_TIMER_DELAY_BASE_UNSPECIFIED,
                License_Policy_TimerDelayBase_FIRST_DECRYPT);
    policy->set_initial_renewal_delay_base(time_delay_base);
  }
  if (fdp_.ConsumeBool()) {
    policy->set_playback_duration_seconds(fdp_.ConsumeIntegral<int64_t>());
  }
  if (fdp_.ConsumeBool()) {
    policy->set_rental_duration_seconds(fdp_.ConsumeIntegral<int64_t>());
  }
  if (fdp_.ConsumeBool()) {
    policy->set_renewal_recovery_duration_seconds(
        fdp_.ConsumeIntegral<int64_t>());
  }
  if (fdp_.ConsumeBool()) {
    policy->set_soft_enforce_rental_duration(fdp_.ConsumeBool());
  }
  if (fdp_.ConsumeBool()) {
    policy->set_can_play(fdp_.ConsumeBool());
  }
  license_.set_license_start_time(fdp_.ConsumeIntegral<int64_t>());
}

void PolicyTimersFuzzer::Process() {
  std::unique_ptr<PolicyTimers> policy_timers;
  if (fdp_.ConsumeBool()) {
    policy_timers = std::make_unique<PolicyTimersV16>();
  } else {
    policy_timers = std::make_unique<PolicyTimersV18>();
  }

  while (fdp_.remaining_bytes()) {
    auto invoke_policy_timers_API =
        fdp_.PickValueInArray<const std::function<void()>>({
            [&]() { SetUp(); },
            [&]() { policy_timers->SetLicense(license_); },
            [&]() {
              policy_timers->BeginDecryption(
                  fdp_.ConsumeIntegral<int64_t>() /*current_time*/);
            },
            [&]() {
              policy_timers->DecryptionEvent(
                  fdp_.ConsumeIntegral<int64_t>() /*current_time*/);
            },
            [&]() {
              policy_timers->RestorePlaybackTimes(
                  fdp_.ConsumeIntegral<int64_t>() /*current_time*/,
                  fdp_.ConsumeIntegral<int64_t>() /*playback_start_time*/,
                  fdp_.ConsumeIntegral<int64_t>() /*last_playback_time*/,
                  fdp_.ConsumeIntegral<int64_t>() /* grace_period_end_time */);
            },
            [&]() {
              policy_timers->GetLicenseOrRentalOrPlaybackDurationRemaining(
                  fdp_.ConsumeIntegral<int64_t>() /*current_time*/);
            },
            [&]() {
              policy_timers->GetPlaybackDurationRemaining(
                  fdp_.ConsumeIntegral<int64_t>() /*current_time*/);
            },
            [&]() {
              int64_t seconds_since_last_played = fdp_.ConsumeIntegral<int64_t>();
              policy_timers->GetSecondsSinceStarted(
                  fdp_.ConsumeIntegral<int64_t>() /*current_time*/,
                  fdp_.ConsumeBool() ? &seconds_since_last_played : nullptr);
            },
            [&]() {
              int64_t seconds_since_last_played = fdp_.ConsumeIntegral<int64_t>();
              policy_timers->GetSecondsSinceLastPlayed(
                  fdp_.ConsumeIntegral<int64_t>() /*current_time*/,
                  fdp_.ConsumeBool() ? &seconds_since_last_played : nullptr);
            },
            [&]() {
              policy_timers->IsLicenseForFuture(
                  fdp_.ConsumeIntegral<int64_t>() /*current_time*/);
            },
            [&]() {
              int64_t expiry_time = fdp_.ConsumeIntegral<int64_t>();
              policy_timers->UpdateExpirationTime(
                  fdp_.ConsumeIntegral<int64_t>() /*current_time*/,
                  fdp_.ConsumeBool() ? &expiry_time : nullptr);
            },
            [&]() {
              policy_timers->HasRenewalRetryIntervalExpired(
                  fdp_.ConsumeIntegral<int64_t>() /*current_time*/);
            },
            [&]() {
              policy_timers->UpdateRenewalRequest(
                  fdp_.ConsumeIntegral<int64_t>() /*current_time*/);
            },
            [&]() {
              policy_timers->HasRenewalRecoveryDurationExpired(
                  fdp_.ConsumeIntegral<int64_t>() /*current_time*/);
            },
            [&]() {
              policy_timers->HasRenewalDelayExpired(
                  fdp_.ConsumeIntegral<int64_t>() /*current_time*/);
            },
            [&]() {
              policy_timers->UpdateLicense(
                  fdp_.ConsumeIntegral<int64_t>() /*current_time*/, license_);
            },
        });
    invoke_policy_timers_API();
  }
}

extern "C" int LLVMFuzzerTestOneInput(const uint8_t* data, size_t size) {
  PolicyTimersFuzzer policy_timers_fuzzer(data, size);
  policy_timers_fuzzer.Process();
  return 0;
}