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/*
* Copyright (C) 2018 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.permission;
import android.annotation.IntDef;
import android.annotation.NonNull;
import android.annotation.Nullable;
import android.app.AppOpsManager;
import android.content.AttributionSourceState;
import android.content.Context;
import android.content.pm.PackageManager;
import android.os.RemoteException;
import android.os.ServiceManager;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.util.Objects;
/**
* Manager for checking runtime and app op permissions. This is a temporary
* class and we may fold its function in the PermissionManager once the
* permission re-architecture starts falling into place. The main benefit
* of this class is to allow context level caching.
*
* @hide
*/
public class PermissionCheckerManager {
/**
* The permission is granted.
*/
public static final int PERMISSION_GRANTED = IPermissionChecker.PERMISSION_GRANTED;
/**
* The permission is denied. Applicable only to runtime and app op permissions.
*
* <p>Returned when:
* <ul>
* <li>the runtime permission is granted, but the corresponding app op is denied
* for runtime permissions.</li>
* <li>the app ops is ignored for app op permissions.</li>
* </ul>
*/
public static final int PERMISSION_SOFT_DENIED = IPermissionChecker.PERMISSION_SOFT_DENIED;
/**
* The permission is denied.
*
* <p>Returned when:
* <ul>
* <li>the permission is denied for non app op permissions.</li>
* <li>the app op is denied or app op is {@link AppOpsManager#MODE_DEFAULT}
* and permission is denied.</li>
* </ul>
*/
public static final int PERMISSION_HARD_DENIED = IPermissionChecker.PERMISSION_HARD_DENIED;
/** @hide */
@IntDef({PERMISSION_GRANTED,
PERMISSION_SOFT_DENIED,
PERMISSION_HARD_DENIED})
@Retention(RetentionPolicy.SOURCE)
public @interface PermissionResult {}
@NonNull
private final Context mContext;
@NonNull
private final IPermissionChecker mService;
@NonNull
private final PackageManager mPackageManager;
public PermissionCheckerManager(@NonNull Context context)
throws ServiceManager.ServiceNotFoundException {
mContext = context;
mService = IPermissionChecker.Stub.asInterface(ServiceManager.getServiceOrThrow(
Context.PERMISSION_CHECKER_SERVICE));
mPackageManager = context.getPackageManager();
}
/**
* Checks a permission by validating the entire attribution source chain. If the
* permission is associated with an app op the op is also noted/started for the
* entire attribution chain.
*
* @param permission The permission
* @param attributionSource The attribution chain to check.
* @param message Message associated with the permission if permission has an app op
* @param forDataDelivery Whether the check is for delivering data if permission has an app op
* @param startDataDelivery Whether to start data delivery (start op) if permission has
* an app op
* @param fromDatasource Whether the check is by a datasource (skip checks for the
* first attribution source in the chain as this is the datasource)
* @param attributedOp Alternative app op to attribute
* @return The permission check result.
*/
@PermissionResult
public int checkPermission(@NonNull String permission,
@NonNull AttributionSourceState attributionSource, @Nullable String message,
boolean forDataDelivery, boolean startDataDelivery, boolean fromDatasource,
int attributedOp) {
Objects.requireNonNull(permission);
Objects.requireNonNull(attributionSource);
// Fast path for non-runtime, non-op permissions where the attribution chain has
// length one. This is the majority of the cases and we want these to be fast by
// hitting the local in process permission cache.
if (AppOpsManager.permissionToOpCode(permission) == AppOpsManager.OP_NONE) {
if (fromDatasource) {
if (attributionSource.next != null && attributionSource.next.length > 0) {
return mContext.checkPermission(permission, attributionSource.next[0].pid,
attributionSource.next[0].uid) == PackageManager.PERMISSION_GRANTED
? PERMISSION_GRANTED : PERMISSION_HARD_DENIED;
}
} else {
return (mContext.checkPermission(permission, attributionSource.pid,
attributionSource.uid) == PackageManager.PERMISSION_GRANTED)
? PERMISSION_GRANTED : PERMISSION_HARD_DENIED;
}
}
try {
return mService.checkPermission(permission, attributionSource, message, forDataDelivery,
startDataDelivery, fromDatasource, attributedOp);
} catch (RemoteException e) {
e.rethrowFromSystemServer();
}
return PERMISSION_HARD_DENIED;
}
/**
* Finishes an app op by validating the entire attribution source chain.
*
* @param op The op to finish.
* @param attributionSource The attribution chain to finish.
* @param fromDatasource Whether the finish is by a datasource (skip finish for the
* first attribution source in the chain as this is the datasource)
*/
public void finishDataDelivery(int op, @NonNull AttributionSourceState attributionSource,
boolean fromDatasource) {
Objects.requireNonNull(attributionSource);
try {
mService.finishDataDelivery(op, attributionSource, fromDatasource);
} catch (RemoteException e) {
e.rethrowFromSystemServer();
}
}
/**
* Checks an app op by validating the entire attribution source chain. The op is
* also noted/started for the entire attribution chain.
*
* @param op The op to check.
* @param attributionSource The attribution chain to check.
* @param message Message associated with the permission if permission has an app op
* @param forDataDelivery Whether the check is for delivering data if permission has an app op
* @param startDataDelivery Whether to start data delivery (start op) if permission has
* an app op
* @return The op check result.
*/
@PermissionResult
public int checkOp(int op, @NonNull AttributionSourceState attributionSource,
@Nullable String message, boolean forDataDelivery, boolean startDataDelivery) {
Objects.requireNonNull(attributionSource);
try {
return mService.checkOp(op, attributionSource, message, forDataDelivery,
startDataDelivery);
} catch (RemoteException e) {
e.rethrowFromSystemServer();
}
return PERMISSION_HARD_DENIED;
}
}
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