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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.os.RemoteException;
import android.os.ServiceManager;
import android.os.ServiceSpecificException;
import android.security.apc.IConfirmationCallback;
import android.security.apc.IProtectedConfirmation;
import android.security.apc.ResponseCode;
import android.util.Log;
/**
* @hide
*/
public class AndroidProtectedConfirmation {
private static final String TAG = "AndroidProtectedConfirmation";
public static final int ERROR_OK = ResponseCode.OK;
public static final int ERROR_CANCELED = ResponseCode.CANCELLED;
public static final int ERROR_ABORTED = ResponseCode.ABORTED;
public static final int ERROR_OPERATION_PENDING = ResponseCode.OPERATION_PENDING;
public static final int ERROR_IGNORED = ResponseCode.IGNORED;
public static final int ERROR_SYSTEM_ERROR = ResponseCode.SYSTEM_ERROR;
public static final int ERROR_UNIMPLEMENTED = ResponseCode.UNIMPLEMENTED;
public static final int FLAG_UI_OPTION_INVERTED =
IProtectedConfirmation.FLAG_UI_OPTION_INVERTED;
public static final int FLAG_UI_OPTION_MAGNIFIED =
IProtectedConfirmation.FLAG_UI_OPTION_MAGNIFIED;
private IProtectedConfirmation mProtectedConfirmation;
public AndroidProtectedConfirmation() {
mProtectedConfirmation = null;
}
private synchronized IProtectedConfirmation getService() {
if (mProtectedConfirmation == null) {
mProtectedConfirmation = IProtectedConfirmation.Stub.asInterface(ServiceManager
.getService("android.security.apc"));
}
return mProtectedConfirmation;
}
/**
* Requests keystore call into the confirmationui HAL to display a prompt.
*
* @param listener the binder to use for callbacks.
* @param promptText the prompt to display.
* @param extraData extra data / nonce from application.
* @param locale the locale as a BCP 47 language tag.
* @param uiOptionsAsFlags the UI options to use, as flags.
* @return one of the {@code CONFIRMATIONUI_*} constants, for
* example {@code KeyStore.CONFIRMATIONUI_OK}.
*/
public int presentConfirmationPrompt(IConfirmationCallback listener, String promptText,
byte[] extraData, String locale, int uiOptionsAsFlags) {
try {
getService().presentPrompt(listener, promptText, extraData, locale,
uiOptionsAsFlags);
return ERROR_OK;
} catch (RemoteException e) {
Log.w(TAG, "Cannot connect to keystore", e);
return ERROR_SYSTEM_ERROR;
} catch (ServiceSpecificException e) {
return e.errorCode;
}
}
/**
* Requests keystore call into the confirmationui HAL to cancel displaying a prompt.
*
* @param listener the binder passed to the {@link #presentConfirmationPrompt} method.
* @return one of the {@code CONFIRMATIONUI_*} constants, for
* example {@code KeyStore.CONFIRMATIONUI_OK}.
*/
public int cancelConfirmationPrompt(IConfirmationCallback listener) {
try {
getService().cancelPrompt(listener);
return ERROR_OK;
} catch (RemoteException e) {
Log.w(TAG, "Cannot connect to keystore", e);
return ERROR_SYSTEM_ERROR;
} catch (ServiceSpecificException e) {
return e.errorCode;
}
}
/**
* Requests keystore to check if the confirmationui HAL is available.
*
* @return whether the confirmationUI HAL is available.
*/
public boolean isConfirmationPromptSupported() {
try {
return getService().isSupported();
} catch (RemoteException e) {
Log.w(TAG, "Cannot connect to keystore", e);
return false;
}
}
}
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