Merge "Add WifiKeystore to allow Wifi framework access legacykeystore"

}

package android.net.wifi {

  public final class WifiKeystore {

    method @NonNull public static byte[] get(@NonNull String);

    method @NonNull public static String[] list(@NonNull String);

    method public static boolean put(@NonNull String, @NonNull byte[]);

    method public static boolean remove(@NonNull String);

  }

}

package android.os {

  public class ArtModuleServiceManager {

/*

 * Copyright (C) 2022 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.net.wifi;

import android.annotation.NonNull;

import android.annotation.SystemApi;

import android.os.Process;

import android.os.ServiceManager;

import android.os.ServiceSpecificException;

import android.security.legacykeystore.ILegacyKeystore;

import android.util.Log;

/**

 * @hide This class allows wifi framework to store and access wifi certificate blobs.

 */

@SystemApi(client = SystemApi.Client.MODULE_LIBRARIES)

public final class WifiKeystore {

    private static final String TAG = "WifiKeystore";

    private static final String LEGACY_KEYSTORE_SERVICE_NAME = "android.security.legacykeystore";

    private static ILegacyKeystore getService() {

        return ILegacyKeystore.Stub.asInterface(

                ServiceManager.checkService(LEGACY_KEYSTORE_SERVICE_NAME));

    }

    /** @hide */

    WifiKeystore() {

    }

    /**

     * Stores the blob under the alias in the keystore database. Existing blobs by the

     * same name will be replaced.

     * @param alias The name of the blob

     * @param blob The blob.

     * @return true if the blob was successfully added. False otherwise.

     * @hide

     */

    @SystemApi(client = SystemApi.Client.MODULE_LIBRARIES)

    public static boolean put(@NonNull String alias, @NonNull byte[] blob) {

        try {

            Log.i(TAG, "put blob. alias " + alias);

            getService().put(alias, Process.WIFI_UID, blob);

            return true;

        } catch (Exception e) {

            Log.e(TAG, "Failed to put blob.", e);

            return false;

        }

    }

    /**

     * Retrieves a blob by the name alias from the blob database.

     * @param alias Name of the blob to retrieve.

     * @return The unstructured blob, that is the blob that was stored using

     *         {@link android.net.wifi.WifiKeystore#put}.

     *         Returns null if no blob was found.

     * @hide

     */

    @SystemApi(client = SystemApi.Client.MODULE_LIBRARIES)

    public static @NonNull byte[] get(@NonNull String alias) {

        try {

            Log.i(TAG, "get blob. alias " + alias);

            return getService().get(alias, Process.WIFI_UID);

        } catch (ServiceSpecificException e) {

            if (e.errorCode != ILegacyKeystore.ERROR_ENTRY_NOT_FOUND) {

                Log.e(TAG, "Failed to get blob.", e);

            }

        } catch (Exception e) {

            Log.e(TAG, "Failed to get blob.", e);

        }

        return null;

    }

    /**

     * Removes a blob by the name alias from the database.

     * @param alias Name of the blob to be removed.

     * @return True if a blob was removed. False if no such blob was found.

     * @hide

     */

    @SystemApi(client = SystemApi.Client.MODULE_LIBRARIES)

    public static boolean remove(@NonNull String alias) {

        try {

            getService().remove(alias, Process.WIFI_UID);

            return true;

        } catch (ServiceSpecificException e) {

            if (e.errorCode != ILegacyKeystore.ERROR_ENTRY_NOT_FOUND) {

                Log.e(TAG, "Failed to remove blob.", e);

            }

        } catch (Exception e) {

            Log.e(TAG, "Failed to remove blob.", e);

        }

        return false;

    }

    /**

     * Lists the blobs stored in the database.

     * @return An array of strings representing the aliases stored in the database.

     *         The return value may be empty but never null.

     * @hide

     */

    @SystemApi(client = SystemApi.Client.MODULE_LIBRARIES)

    public static @NonNull String[] list(@NonNull String prefix) {

        try {

            final String[] aliases = getService().list(prefix, Process.WIFI_UID);

            for (int i = 0; i < aliases.length; ++i) {

                aliases[i] = aliases[i].substring(prefix.length());

            }

            return aliases;

        } catch (Exception e) {

            Log.e(TAG, "Failed to list blobs.", e);

        }

        return new String[0];

    }

}

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