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/*
* Copyright (C) 2020 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.
*/
#define LOG_TAG "secureclock_test"
#include <android-base/logging.h>
#include <aidl/Gtest.h>
#include <aidl/Vintf.h>
#include <aidl/android/hardware/security/keymint/ErrorCode.h>
#include <aidl/android/hardware/security/secureclock/ISecureClock.h>
#include <android/binder_manager.h>
#include <binder/ProcessState.h>
#include <gtest/gtest.h>
#include <vector>
namespace aidl::android::hardware::security::secureclock::test {
using Status = ::ndk::ScopedAStatus;
using ::aidl::android::hardware::security::keymint::ErrorCode;
using ::std::shared_ptr;
using ::std::string;
using ::std::vector;
class SecureClockAidlTest : public ::testing::TestWithParam<string> {
public:
struct TimestampTokenResult {
ErrorCode error;
TimeStampToken token;
};
TimestampTokenResult getTimestampToken(int64_t in_challenge) {
TimestampTokenResult result;
result.error =
GetReturnErrorCode(secureClock_->generateTimeStamp(in_challenge, &result.token));
return result;
}
uint64_t getTime() {
struct timespec timespec;
EXPECT_EQ(0, clock_gettime(CLOCK_BOOTTIME, ×pec));
return timespec.tv_sec * 1000 + timespec.tv_nsec / 1000000;
}
int sleep_ms(uint32_t milliseconds) {
struct timespec sleep_time = {static_cast<time_t>(milliseconds / 1000),
static_cast<long>(milliseconds % 1000) * 1000000};
while (sleep_time.tv_sec || sleep_time.tv_nsec) {
if (nanosleep(&sleep_time /* to wait */,
&sleep_time /* remaining (on interrruption) */) == 0) {
sleep_time = {};
} else {
if (errno != EINTR) return errno;
}
}
return 0;
}
ErrorCode GetReturnErrorCode(const Status& result) {
if (result.isOk()) return ErrorCode::OK;
if (result.getExceptionCode() == EX_SERVICE_SPECIFIC) {
return static_cast<ErrorCode>(result.getServiceSpecificError());
}
return ErrorCode::UNKNOWN_ERROR;
}
void InitializeSecureClock(std::shared_ptr<ISecureClock> secureClock) {
ASSERT_NE(secureClock, nullptr);
secureClock_ = secureClock;
}
ISecureClock& secureClock() { return *secureClock_; }
static vector<string> build_params() {
auto params = ::android::getAidlHalInstanceNames(ISecureClock::descriptor);
return params;
}
void SetUp() override {
if (AServiceManager_isDeclared(GetParam().c_str())) {
::ndk::SpAIBinder binder(AServiceManager_waitForService(GetParam().c_str()));
InitializeSecureClock(ISecureClock::fromBinder(binder));
} else {
InitializeSecureClock(nullptr);
}
}
void TearDown() override {}
private:
std::shared_ptr<ISecureClock> secureClock_;
};
/*
* The precise capabilities required to generate TimeStampToken will vary depending on the specific
* vendor implementations. The only thing we really can test is that tokens can be created by
* secureclock services, and that the timestamps increase as expected.
*/
TEST_P(SecureClockAidlTest, TestCreation) {
auto result1 = getTimestampToken(1 /* challenge */);
auto result1_time = getTime();
EXPECT_EQ(ErrorCode::OK, result1.error);
EXPECT_EQ(1U, result1.token.challenge);
EXPECT_GT(result1.token.timestamp.milliSeconds, 0U);
unsigned long time_to_sleep = 200;
sleep_ms(time_to_sleep);
auto result2 = getTimestampToken(2 /* challenge */);
auto result2_time = getTime();
EXPECT_EQ(ErrorCode::OK, result2.error);
EXPECT_EQ(2U, result2.token.challenge);
EXPECT_GT(result2.token.timestamp.milliSeconds, 0U);
auto host_time_delta = result2_time - result1_time;
EXPECT_GE(host_time_delta, time_to_sleep)
<< "We slept for " << time_to_sleep << " ms, the clock must have advanced by that much";
EXPECT_LE(host_time_delta, time_to_sleep + 100)
<< "The getTimestampToken call took " << (host_time_delta - time_to_sleep)
<< " ms? That's awful!";
EXPECT_GE(result2.token.timestamp.milliSeconds, result1.token.timestamp.milliSeconds);
unsigned long km_time_delta =
result2.token.timestamp.milliSeconds - result1.token.timestamp.milliSeconds;
// 20 ms of slop just to avoid test flakiness.
EXPECT_LE(host_time_delta, km_time_delta + 20);
EXPECT_LE(km_time_delta, host_time_delta + 20);
ASSERT_EQ(result1.token.mac.size(), result2.token.mac.size());
ASSERT_NE(0,
memcmp(result1.token.mac.data(), result2.token.mac.data(), result1.token.mac.size()));
}
/*
* Test that the mac changes when the time stamp changes. This is does not guarantee that the time
* stamp is included in the mac but on failure we know that it is not. Other than in the test
* case above we call getTimestampToken with the exact same set of parameters.
*/
TEST_P(SecureClockAidlTest, MacChangesOnChangingTimestamp) {
auto result1 = getTimestampToken(0 /* challenge */);
auto result1_time = getTime();
EXPECT_EQ(ErrorCode::OK, result1.error);
EXPECT_EQ(0U, result1.token.challenge);
EXPECT_GT(result1.token.timestamp.milliSeconds, 0U);
unsigned long time_to_sleep = 200;
sleep_ms(time_to_sleep);
auto result2 = getTimestampToken(1 /* challenge */);
auto result2_time = getTime();
EXPECT_EQ(ErrorCode::OK, result2.error);
EXPECT_EQ(1U, result2.token.challenge);
EXPECT_GT(result2.token.timestamp.milliSeconds, 0U);
auto host_time_delta = result2_time - result1_time;
EXPECT_GE(host_time_delta, time_to_sleep)
<< "We slept for " << time_to_sleep << " ms, the clock must have advanced by that much";
EXPECT_LE(host_time_delta, time_to_sleep + 100)
<< "The getTimestampToken call took " << (host_time_delta - time_to_sleep)
<< " ms? That's awful!";
EXPECT_GE(result2.token.timestamp.milliSeconds, result1.token.timestamp.milliSeconds);
unsigned long km_time_delta =
result2.token.timestamp.milliSeconds - result1.token.timestamp.milliSeconds;
EXPECT_LE(host_time_delta, km_time_delta + 20);
EXPECT_LE(km_time_delta, host_time_delta + 20);
ASSERT_EQ(result1.token.mac.size(), result2.token.mac.size());
ASSERT_NE(0,
memcmp(result1.token.mac.data(), result2.token.mac.data(), result1.token.mac.size()));
}
INSTANTIATE_TEST_SUITE_P(PerInstance, SecureClockAidlTest,
testing::ValuesIn(SecureClockAidlTest::build_params()),
::android::PrintInstanceNameToString);
GTEST_ALLOW_UNINSTANTIATED_PARAMETERIZED_TEST(SecureClockAidlTest);
} // namespace aidl::android::hardware::security::secureclock::test
int main(int argc, char** argv) {
::testing::InitGoogleTest(&argc, argv);
return RUN_ALL_TESTS();
}
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