Import ClearCryptoStateTask

/*

 * Copyright (C) 2019 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 com.android.server.backup.encryption.tasks;

import android.content.Context;

import android.util.Slog;

import com.android.server.backup.encryption.CryptoSettings;

import com.android.server.backup.encryption.chunking.ProtoStore;

import com.android.server.backup.encryption.storage.BackupEncryptionDb;

import com.android.server.backup.encryption.storage.EncryptionDbException;

import java.io.IOException;

/**

 * Task to clear local crypto state.

 *

 * <p>Needs to run whenever the user changes their backup account.

 */

public class ClearCryptoStateTask {

    private static final String TAG = "ClearCryptoStateTask";

    private final Context mContext;

    private final CryptoSettings mCryptoSettings;

    /**

     * A new instance.

     *

     * @param context for finding local storage.

     * @param cryptoSettings to clear

     */

    public ClearCryptoStateTask(Context context, CryptoSettings cryptoSettings) {

        mContext = context;

        mCryptoSettings = cryptoSettings;

    }

    /** Deletes all local state for backup (not restore). */

    public void run() {

        Slog.d(TAG, "Clearing local crypto state.");

        try {

            BackupEncryptionDb.newInstance(mContext).clear();

        } catch (EncryptionDbException e) {

            Slog.e(TAG, "Error clearing encryption database", e);

        }

        mCryptoSettings.clearAllSettingsForBackup();

        try {

            ProtoStore.createChunkListingStore(mContext).deleteAllProtos();

        } catch (IOException e) {

            Slog.e(TAG, "Error clearing chunk listing store", e);

        }

        try {

            ProtoStore.createKeyValueListingStore(mContext).deleteAllProtos();

        } catch (IOException e) {

            Slog.e(TAG, "Error clearing key-value store", e);

        }

    }

}

/*

 * Copyright (C) 2019 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 com.android.server.backup.encryption.tasks;

import static com.google.common.truth.Truth.assertThat;

import static org.mockito.Mockito.spy;

import android.content.Context;

import android.platform.test.annotations.Presubmit;

import androidx.test.core.app.ApplicationProvider;

import com.android.server.backup.encryption.CryptoSettings;

import com.android.server.backup.encryption.chunking.ProtoStore;

import com.android.server.backup.encryption.protos.nano.ChunksMetadataProto.ChunkListing;

import com.android.server.backup.encryption.protos.nano.KeyValueListingProto.KeyValueListing;

import com.android.server.backup.encryption.storage.BackupEncryptionDb;

import com.android.server.backup.encryption.storage.TertiaryKey;

import com.android.server.backup.encryption.storage.TertiaryKeysTable;

import org.junit.Before;

import org.junit.Test;

import org.junit.runner.RunWith;

import org.robolectric.RobolectricTestRunner;

@RunWith(RobolectricTestRunner.class)

@Presubmit

public class ClearCryptoStateTaskTest {

    private static final String TEST_PACKAGE_NAME = "com.android.example";

    private ClearCryptoStateTask mClearCryptoStateTask;

    private CryptoSettings mCryptoSettings;

    private Context mApplication;

    @Before

    public void setUp() {

        mApplication = ApplicationProvider.getApplicationContext();

        mCryptoSettings = spy(CryptoSettings.getInstanceForTesting(mApplication));

        mClearCryptoStateTask = new ClearCryptoStateTask(mApplication, mCryptoSettings);

    }

    @Test

    public void run_clearsChunkListingProtoState() throws Exception {

        String packageName = TEST_PACKAGE_NAME;

        ChunkListing chunkListing = new ChunkListing();

        ProtoStore.createChunkListingStore(mApplication).saveProto(packageName, chunkListing);

        mClearCryptoStateTask.run();

        assertThat(

                        ProtoStore.createChunkListingStore(mApplication)

                                .loadProto(packageName)

                                .isPresent())

                .isFalse();

    }

    @Test

    public void run_clearsKeyValueProtoState() throws Exception {

        String packageName = TEST_PACKAGE_NAME;

        KeyValueListing keyValueListing = new KeyValueListing();

        ProtoStore.createKeyValueListingStore(mApplication).saveProto(packageName, keyValueListing);

        mClearCryptoStateTask.run();

        assertThat(

                        ProtoStore.createKeyValueListingStore(mApplication)

                                .loadProto(packageName)

                                .isPresent())

                .isFalse();

    }

    @Test

    public void run_clearsTertiaryKeysTable() throws Exception {

        String secondaryKeyAlias = "bob";

        TertiaryKeysTable tertiaryKeysTable =

                BackupEncryptionDb.newInstance(mApplication).getTertiaryKeysTable();

        tertiaryKeysTable.addKey(

                new TertiaryKey(

                        secondaryKeyAlias, "packageName", /*wrappedKeyBytes=*/ new byte[0]));

        mClearCryptoStateTask.run();

        assertThat(tertiaryKeysTable.getAllKeys(secondaryKeyAlias)).isEmpty();

    }

    @Test

    public void run_clearsSettings() {

        mCryptoSettings.setSecondaryLastRotated(100001);

        mClearCryptoStateTask.run();

        assertThat(mCryptoSettings.getSecondaryLastRotated().isPresent()).isFalse();

    }

}