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/*
* Copyright 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 "BluetoothKeystoreServiceJni"
#include "base/logging.h"
#include "com_android_bluetooth.h"
#include "hardware/bt_keystore.h"
#include <string.h>
#include <shared_mutex>
using bluetooth::bluetooth_keystore::BluetoothKeystoreCallbacks;
using bluetooth::bluetooth_keystore::BluetoothKeystoreInterface;
namespace android {
static jmethodID method_setEncryptKeyOrRemoveKeyCallback;
static jmethodID method_getKeyCallback;
static BluetoothKeystoreInterface* sBluetoothKeystoreInterface = nullptr;
static std::shared_timed_mutex interface_mutex;
static jobject mCallbacksObj = nullptr;
static std::shared_timed_mutex callbacks_mutex;
class BluetoothKeystoreCallbacksImpl
: public bluetooth::bluetooth_keystore::BluetoothKeystoreCallbacks {
public:
~BluetoothKeystoreCallbacksImpl() = default;
void set_encrypt_key_or_remove_key(
const std::string prefixString,
const std::string decryptedString) override {
LOG(INFO) << __func__;
std::shared_lock<std::shared_timed_mutex> lock(callbacks_mutex);
CallbackEnv sCallbackEnv(__func__);
if (!sCallbackEnv.valid() || mCallbacksObj == nullptr) return;
jstring j_prefixString = sCallbackEnv->NewStringUTF(prefixString.c_str());
jstring j_decryptedString =
sCallbackEnv->NewStringUTF(decryptedString.c_str());
sCallbackEnv->CallVoidMethod(mCallbacksObj,
method_setEncryptKeyOrRemoveKeyCallback,
j_prefixString, j_decryptedString);
}
std::string get_key(const std::string prefixString) override {
LOG(INFO) << __func__;
std::shared_lock<std::shared_timed_mutex> lock(callbacks_mutex);
CallbackEnv sCallbackEnv(__func__);
if (!sCallbackEnv.valid() || mCallbacksObj == nullptr) return "";
jstring j_prefixString = sCallbackEnv->NewStringUTF(prefixString.c_str());
jstring j_decrypt_str = (jstring)sCallbackEnv->CallObjectMethod(
mCallbacksObj, method_getKeyCallback, j_prefixString);
if (j_decrypt_str == nullptr) {
ALOGE("%s: Got a null decrypt_str", __func__);
return "";
}
const char* value = sCallbackEnv->GetStringUTFChars(j_decrypt_str, nullptr);
std::string ret(value);
sCallbackEnv->ReleaseStringUTFChars(j_decrypt_str, value);
return ret;
}
};
static BluetoothKeystoreCallbacksImpl sBluetoothKeystoreCallbacks;
static void classInitNative(JNIEnv* env, jclass clazz) {
method_setEncryptKeyOrRemoveKeyCallback =
env->GetMethodID(clazz, "setEncryptKeyOrRemoveKeyCallback",
"(Ljava/lang/String;Ljava/lang/String;)V");
method_getKeyCallback = env->GetMethodID(
clazz, "getKeyCallback", "(Ljava/lang/String;)Ljava/lang/String;");
LOG(INFO) << __func__ << ": succeeds";
}
static void initNative(JNIEnv* env, jobject object) {
std::unique_lock<std::shared_timed_mutex> interface_lock(interface_mutex);
std::unique_lock<std::shared_timed_mutex> callbacks_lock(callbacks_mutex);
const bt_interface_t* btInf = getBluetoothInterface();
if (btInf == nullptr) {
LOG(ERROR) << "Bluetooth module is not loaded";
return;
}
if (sBluetoothKeystoreInterface != nullptr) {
LOG(INFO)
<< "Cleaning up BluetoothKeystore Interface before initializing...";
sBluetoothKeystoreInterface = nullptr;
}
if (mCallbacksObj != nullptr) {
LOG(INFO) << "Cleaning up BluetoothKeystore callback object";
env->DeleteGlobalRef(mCallbacksObj);
mCallbacksObj = nullptr;
}
if ((mCallbacksObj = env->NewGlobalRef(object)) == nullptr) {
LOG(ERROR)
<< "Failed to allocate Global Ref for BluetoothKeystore Callbacks";
return;
}
sBluetoothKeystoreInterface =
(BluetoothKeystoreInterface*)btInf->get_profile_interface(BT_KEYSTORE_ID);
if (sBluetoothKeystoreInterface == nullptr) {
LOG(ERROR) << "Failed to get BluetoothKeystore Interface";
return;
}
sBluetoothKeystoreInterface->init(&sBluetoothKeystoreCallbacks);
}
static void cleanupNative(JNIEnv* env, jobject object) {
std::unique_lock<std::shared_timed_mutex> interface_lock(interface_mutex);
std::unique_lock<std::shared_timed_mutex> callbacks_lock(callbacks_mutex);
const bt_interface_t* btInf = getBluetoothInterface();
if (btInf == nullptr) {
LOG(ERROR) << "Bluetooth module is not loaded";
return;
}
if (sBluetoothKeystoreInterface != nullptr) {
sBluetoothKeystoreInterface = nullptr;
}
if (mCallbacksObj != nullptr) {
env->DeleteGlobalRef(mCallbacksObj);
mCallbacksObj = nullptr;
}
}
static JNINativeMethod sMethods[] = {
{"classInitNative", "()V", (void*)classInitNative},
{"initNative", "()V", (void*)initNative},
{"cleanupNative", "()V", (void*)cleanupNative},
};
int register_com_android_bluetooth_btservice_BluetoothKeystore(JNIEnv* env) {
return jniRegisterNativeMethods(
env,
"com/android/bluetooth/btservice/bluetoothkeystore/"
"BluetoothKeystoreNativeInterface",
sMethods, NELEM(sMethods));
}
} // namespace android
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