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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.biometrics.BiometricConstants;
import android.hardware.security.keymint.HardwareAuthToken;
import android.hardware.security.keymint.HardwareAuthenticatorType;
import android.os.RemoteException;
import android.os.ServiceManager;
import android.os.ServiceSpecificException;
import android.os.StrictMode;
import android.security.authorization.IKeystoreAuthorization;
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";
public static final int SYSTEM_ERROR = ResponseCode.SYSTEM_ERROR;
/**
* @return an instance of IKeystoreAuthorization
*/
public static IKeystoreAuthorization getService() {
return IKeystoreAuthorization.Stub.asInterface(
ServiceManager.checkService("android.security.authorization"));
}
/**
* Adds an auth token to keystore2.
*
* @param authToken created by Android authenticators.
* @return 0 if successful or {@code ResponseCode.SYSTEM_ERROR}.
*/
public static int addAuthToken(@NonNull HardwareAuthToken authToken) {
StrictMode.noteSlowCall("addAuthToken");
try {
getService().addAuthToken(authToken);
return 0;
} catch (RemoteException | NullPointerException 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 static int addAuthToken(@NonNull byte[] authToken) {
return addAuthToken(AuthTokenUtils.toHardwareAuthToken(authToken));
}
/**
* Tells Keystore that the device is now unlocked for a user.
*
* @param userId - the user's Android user ID
* @param password - a secret derived from the user's synthetic password, if the unlock method
* is LSKF (or equivalent) and thus has made the synthetic password available
* @return 0 if successful or a {@code ResponseCode}.
*/
public static int onDeviceUnlocked(int userId, @Nullable byte[] password) {
StrictMode.noteDiskWrite();
try {
getService().onDeviceUnlocked(userId, password);
return 0;
} catch (RemoteException | NullPointerException e) {
Log.w(TAG, "Can not connect to keystore", e);
return SYSTEM_ERROR;
} catch (ServiceSpecificException e) {
return e.errorCode;
}
}
/**
* Tells Keystore that the device is now locked for a user.
*
* @param userId - the user's Android user ID
* @param unlockingSids - list of biometric SIDs with which the device may be unlocked again
* @param weakUnlockEnabled - true if non-strong biometric or trust agent unlock is enabled
* @return 0 if successful or a {@code ResponseCode}.
*/
public static int onDeviceLocked(int userId, @NonNull long[] unlockingSids,
boolean weakUnlockEnabled) {
StrictMode.noteDiskWrite();
try {
getService().onDeviceLocked(userId, unlockingSids, weakUnlockEnabled);
return 0;
} catch (RemoteException | NullPointerException e) {
Log.w(TAG, "Can not connect to keystore", e);
return SYSTEM_ERROR;
} catch (ServiceSpecificException e) {
return e.errorCode;
}
}
/**
* Gets the last authentication time of the given user and authenticators.
*
* @param userId user id
* @param authenticatorTypes an array of {@link HardwareAuthenticatorType}.
* @return the last authentication time or
* {@link BiometricConstants#BIOMETRIC_NO_AUTHENTICATION}.
*/
public static long getLastAuthenticationTime(
long userId, @HardwareAuthenticatorType int[] authenticatorTypes) {
try {
return getService().getLastAuthTime(userId, authenticatorTypes);
} catch (RemoteException | NullPointerException e) {
Log.w(TAG, "Can not connect to keystore", e);
return BiometricConstants.BIOMETRIC_NO_AUTHENTICATION;
} catch (ServiceSpecificException e) {
return BiometricConstants.BIOMETRIC_NO_AUTHENTICATION;
}
}
}
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