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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.
*/
#include <string>
#include <errno.h>
#include <sys/stat.h>
#include <android-base/file.h>
#include <android-base/logging.h>
#include <android-base/stringprintf.h>
#include <gtest/gtest.h>
#include "apex_file.h"
#include "apex_preinstalled_data.h"
#include "apexd_test_utils.h"
#include "apexd_verity.h"
namespace android {
namespace apex {
using namespace std::literals;
using android::apex::testing::IsOk;
using android::base::GetExecutableDirectory;
using android::base::ReadFileToString;
using android::base::StringPrintf;
static std::string GetTestDataDir() { return GetExecutableDirectory(); }
static std::string GetTestFile(const std::string& name) {
return GetTestDataDir() + "/" + name;
}
TEST(ApexdVerityTest, ReusesHashtree) {
ASSERT_TRUE(IsOk(collectPreinstalledData({"/system_ext/apex"})));
TemporaryDir td;
auto apex = ApexFile::Open(GetTestFile("apex.apexd_test_no_hashtree.apex"));
ASSERT_TRUE(IsOk(apex));
auto verity_data = apex->VerifyApexVerity();
ASSERT_TRUE(IsOk(verity_data));
auto hashtree_file = StringPrintf("%s/hashtree", td.path);
auto status = PrepareHashTree(*apex, *verity_data, hashtree_file);
ASSERT_TRUE(IsOk(status));
ASSERT_EQ(KRegenerate, *status);
std::string first_hashtree;
ASSERT_TRUE(ReadFileToString(hashtree_file, &first_hashtree))
<< "Failed to read " << hashtree_file;
// Now call PrepareHashTree again. Since digest matches, hashtree should be
// reused.
status = PrepareHashTree(*apex, *verity_data, hashtree_file);
ASSERT_TRUE(IsOk(status));
ASSERT_EQ(kReuse, *status);
std::string second_hashtree;
ASSERT_TRUE(ReadFileToString(hashtree_file, &second_hashtree))
<< "Failed to read " << hashtree_file;
// Hashtree file shouldn't be modified.
ASSERT_EQ(first_hashtree, second_hashtree)
<< hashtree_file << " was regenerated";
}
TEST(ApexdVerityTest, RegenerateHashree) {
ASSERT_TRUE(IsOk(collectPreinstalledData({"/system_ext/apex"})));
TemporaryDir td;
auto apex = ApexFile::Open(GetTestFile("apex.apexd_test_no_hashtree.apex"));
ASSERT_TRUE(IsOk(apex));
auto verity_data = apex->VerifyApexVerity();
ASSERT_TRUE(IsOk(verity_data));
auto hashtree_file = StringPrintf("%s/hashtree", td.path);
auto status = PrepareHashTree(*apex, *verity_data, hashtree_file);
ASSERT_TRUE(IsOk(status));
ASSERT_EQ(KRegenerate, *status);
std::string first_hashtree;
ASSERT_TRUE(ReadFileToString(hashtree_file, &first_hashtree))
<< "Failed to read " << hashtree_file;
auto apex2 =
ApexFile::Open(GetTestFile("apex.apexd_test_no_hashtree_2.apex"));
ASSERT_TRUE(IsOk(apex2));
auto verity_data2 = apex2->VerifyApexVerity();
ASSERT_TRUE(IsOk(verity_data2));
// Now call PrepareHashTree again. Since digest doesn't match, hashtree
// should be regenerated.
status = PrepareHashTree(*apex2, *verity_data2, hashtree_file);
ASSERT_TRUE(IsOk(status));
ASSERT_EQ(KRegenerate, *status);
std::string second_hashtree;
ASSERT_TRUE(ReadFileToString(hashtree_file, &second_hashtree))
<< "Failed to read " << hashtree_file;
// Hashtree file should be regenerated.
ASSERT_NE(first_hashtree, second_hashtree) << hashtree_file << " was reused";
}
} // namespace apex
} // namespace android
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