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/*
* Copyright (C) 2021 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.hardware.biometrics;
import android.annotation.NonNull;
import android.annotation.Nullable;
import android.app.admin.DevicePolicyManager;
import android.content.ComponentName;
import android.content.Context;
import android.os.Build;
import android.os.UserHandle;
import android.provider.Settings;
/**
* "Base" functionality. For settings-specific functionality (which may rely on this base
* functionality), see {@link com.android.settings.biometrics.ParentalControlsUtils}
* @hide
*/
public class ParentalControlsUtilsInternal {
private static final String TEST_ALWAYS_REQUIRE_CONSENT_PACKAGE =
"android.hardware.biometrics.ParentalControlsUtilsInternal.require_consent_package";
private static final String TEST_ALWAYS_REQUIRE_CONSENT_CLASS =
"android.hardware.biometrics.ParentalControlsUtilsInternal.require_consent_class";
/**
* ComponentName of Parent Consent activity for testing Biometric authentication disabled by
* Parental Controls.
*
* <p>Component could be defined by values of {@link #TEST_ALWAYS_REQUIRE_CONSENT_PACKAGE} and
* {@link #TEST_ALWAYS_REQUIRE_CONSENT_CLASS} Secure settings.
*/
public static ComponentName getTestComponentName(@NonNull Context context, int userId) {
if (Build.IS_USERDEBUG || Build.IS_ENG) {
final String pkg = Settings.Secure.getStringForUser(context.getContentResolver(),
TEST_ALWAYS_REQUIRE_CONSENT_PACKAGE, userId);
final String cls = Settings.Secure.getStringForUser(context.getContentResolver(),
TEST_ALWAYS_REQUIRE_CONSENT_CLASS, userId);
return pkg != null && cls != null ? new ComponentName(pkg, cls) : null;
}
return null;
}
public static boolean parentConsentRequired(@NonNull Context context,
@NonNull DevicePolicyManager dpm, @BiometricAuthenticator.Modality int modality,
@NonNull UserHandle userHandle) {
if (getTestComponentName(context, userHandle.getIdentifier()) != null) {
return true;
}
return parentConsentRequired(dpm, modality, userHandle);
}
/**
* @return true if parental consent is required in order for biometric sensors to be used.
*/
public static boolean parentConsentRequired(@NonNull DevicePolicyManager dpm,
@BiometricAuthenticator.Modality int modality, @NonNull UserHandle userHandle) {
final ComponentName cn = getSupervisionComponentName(dpm, userHandle);
if (cn == null) {
return false;
}
final int keyguardDisabledFeatures = dpm.getKeyguardDisabledFeatures(cn);
final boolean dpmFpDisabled = containsFlag(keyguardDisabledFeatures,
DevicePolicyManager.KEYGUARD_DISABLE_FINGERPRINT);
final boolean dpmFaceDisabled = containsFlag(keyguardDisabledFeatures,
DevicePolicyManager.KEYGUARD_DISABLE_FACE);
final boolean dpmIrisDisabled = containsFlag(keyguardDisabledFeatures,
DevicePolicyManager.KEYGUARD_DISABLE_IRIS);
final boolean consentRequired;
if (containsFlag(modality, BiometricAuthenticator.TYPE_FINGERPRINT) && dpmFpDisabled) {
consentRequired = true;
} else if (containsFlag(modality, BiometricAuthenticator.TYPE_FACE) && dpmFaceDisabled) {
consentRequired = true;
} else if (containsFlag(modality, BiometricAuthenticator.TYPE_IRIS) && dpmIrisDisabled) {
consentRequired = true;
} else {
consentRequired = false;
}
return consentRequired;
}
@Nullable
public static ComponentName getSupervisionComponentName(@NonNull DevicePolicyManager dpm,
@NonNull UserHandle userHandle) {
return dpm.getProfileOwnerOrDeviceOwnerSupervisionComponent(userHandle);
}
private static boolean containsFlag(int haystack, int needle) {
return (haystack & needle) != 0;
}
}
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