You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
95 lines
3.2 KiB
95 lines
3.2 KiB
4 months ago
|
/*
|
||
|
|
* 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 "VolumeEncryption.h"
|
||
|
|
|
||
|
|
#include <string>
|
||
|
|
|
||
|
|
#include <android-base/logging.h>
|
||
|
|
#include <android-base/properties.h>
|
||
|
|
|
||
|
|
#include "KeyBuffer.h"
|
||
|
|
#include "KeyUtil.h"
|
||
|
|
#include "MetadataCrypt.h"
|
||
|
|
#include "cryptfs.h"
|
||
|
|
|
||
|
|
namespace android {
|
||
|
|
namespace vold {
|
||
|
|
|
||
|
|
enum class VolumeMethod { kFailed, kCrypt, kDefaultKey };
|
||
|
|
|
||
|
|
static VolumeMethod lookup_volume_method() {
|
||
|
|
auto first_api_level =
|
||
|
|
android::base::GetUintProperty<uint64_t>("ro.product.first_api_level", 0);
|
||
|
|
auto method = android::base::GetProperty("ro.crypto.volume.metadata.method", "default");
|
||
|
|
if (method == "default") {
|
||
|
|
return first_api_level > __ANDROID_API_Q__ ? VolumeMethod::kDefaultKey
|
||
|
|
: VolumeMethod::kCrypt;
|
||
|
|
} else if (method == "dm-default-key") {
|
||
|
|
return VolumeMethod::kDefaultKey;
|
||
|
|
} else if (method == "dm-crypt") {
|
||
|
|
if (first_api_level > __ANDROID_API_Q__) {
|
||
|
|
LOG(ERROR) << "volume encryption method dm-crypt cannot be used, "
|
||
|
|
"ro.product.first_api_level = "
|
||
|
|
<< first_api_level;
|
||
|
|
return VolumeMethod::kFailed;
|
||
|
|
}
|
||
|
|
return VolumeMethod::kCrypt;
|
||
|
|
} else {
|
||
|
|
LOG(ERROR) << "Unknown volume encryption method: " << method;
|
||
|
|
return VolumeMethod::kFailed;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
static VolumeMethod volume_method() {
|
||
|
|
static VolumeMethod method = lookup_volume_method();
|
||
|
|
return method;
|
||
|
|
}
|
||
|
|
|
||
|
|
bool generate_volume_key(android::vold::KeyBuffer* key) {
|
||
|
|
KeyGeneration gen;
|
||
|
|
switch (volume_method()) {
|
||
|
|
case VolumeMethod::kFailed:
|
||
|
|
LOG(ERROR) << "Volume encryption setup failed";
|
||
|
|
return false;
|
||
|
|
case VolumeMethod::kCrypt:
|
||
|
|
gen = cryptfs_get_keygen();
|
||
|
|
break;
|
||
|
|
case VolumeMethod::kDefaultKey:
|
||
|
|
if (!defaultkey_volume_keygen(&gen)) return false;
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
if (!generateStorageKey(gen, key)) return false;
|
||
|
|
return true;
|
||
|
|
}
|
||
|
|
|
||
|
|
bool setup_ext_volume(const std::string& label, const std::string& blk_device,
|
||
|
|
const android::vold::KeyBuffer& key, std::string* out_crypto_blkdev) {
|
||
|
|
switch (volume_method()) {
|
||
|
|
case VolumeMethod::kFailed:
|
||
|
|
LOG(ERROR) << "Volume encryption setup failed";
|
||
|
|
return false;
|
||
|
|
case VolumeMethod::kCrypt:
|
||
|
|
return cryptfs_setup_ext_volume(label.c_str(), blk_device.c_str(), key,
|
||
|
|
out_crypto_blkdev) == 0;
|
||
|
|
case VolumeMethod::kDefaultKey:
|
||
|
|
return defaultkey_setup_ext_volume(label, blk_device, key, out_crypto_blkdev);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
} // namespace vold
|
||
|
|
} // namespace android
|