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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.
*/
package android.security;
import android.annotation.NonNull;
import android.annotation.Nullable;
import android.hardware.security.keymint.HardwareAuthToken;
import android.os.RemoteException;
import android.os.ServiceManager;
import android.os.ServiceSpecificException;
import android.security.authorization.IKeystoreAuthorization;
import android.security.authorization.LockScreenEvent;
import android.system.keystore2.ResponseCode;
import android.util.Log;
/**
* @hide This is the client side for IKeystoreAuthorization AIDL.
* It shall only be used by biometric authentication providers and Gatekeeper.
*/
public class Authorization {
private static final String TAG = "KeystoreAuthorization";
private static IKeystoreAuthorization sIKeystoreAuthorization;
public static final int SYSTEM_ERROR = ResponseCode.SYSTEM_ERROR;
public Authorization() {
sIKeystoreAuthorization = null;
}
private static synchronized IKeystoreAuthorization getService() {
if (sIKeystoreAuthorization == null) {
sIKeystoreAuthorization = IKeystoreAuthorization.Stub.asInterface(
ServiceManager.checkService("android.security.authorization"));
}
return sIKeystoreAuthorization;
}
/**
* Adds an auth token to keystore2.
*
* @param authToken created by Android authenticators.
* @return 0 if successful or {@code ResponseCode.SYSTEM_ERROR}.
*/
public int addAuthToken(@NonNull HardwareAuthToken authToken) {
if (!android.security.keystore2.AndroidKeyStoreProvider.isInstalled()) return 0;
try {
getService().addAuthToken(authToken);
return 0;
} catch (RemoteException e) {
Log.w(TAG, "Can not connect to keystore", e);
return SYSTEM_ERROR;
} catch (ServiceSpecificException e) {
return e.errorCode;
}
}
/**
* Add an auth token to Keystore 2.0 in the legacy serialized auth token format.
* @param authToken
* @return 0 if successful or a {@code ResponseCode}.
*/
public int addAuthToken(@NonNull byte[] authToken) {
return addAuthToken(AuthTokenUtils.toHardwareAuthToken(authToken));
}
/**
* Informs keystore2 about lock screen event.
*
* @param locked - whether it is a lock (true) or unlock (false) event
* @param syntheticPassword - if it is an unlock event with the password, pass the synthetic
* password provided by the LockSettingService
*
* @return 0 if successful or a {@code ResponseCode}.
*/
public int onLockScreenEvent(@NonNull boolean locked, @NonNull int userId,
@Nullable byte[] syntheticPassword) {
if (!android.security.keystore2.AndroidKeyStoreProvider.isInstalled()) return 0;
try {
if (locked) {
getService().onLockScreenEvent(LockScreenEvent.LOCK, userId, null);
} else {
getService().onLockScreenEvent(LockScreenEvent.UNLOCK, userId, syntheticPassword);
}
return 0;
} catch (RemoteException e) {
Log.w(TAG, "Can not connect to keystore", e);
return SYSTEM_ERROR;
} catch (ServiceSpecificException e) {
return e.errorCode;
}
}
}
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