399 lines
17 KiB
Java
399 lines
17 KiB
Java
package eu.siacs.conversations.services;
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import android.app.Notification;
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import android.app.NotificationManager;
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import android.app.PendingIntent;
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import android.app.Service;
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import android.content.Context;
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import android.content.Intent;
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import android.database.Cursor;
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import android.database.DatabaseUtils;
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import android.database.sqlite.SQLiteDatabase;
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import android.net.Uri;
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import android.os.IBinder;
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import androidx.core.app.NotificationCompat;
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import android.util.Log;
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import com.google.common.base.Strings;
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import java.io.DataOutputStream;
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import java.io.File;
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import java.io.FileOutputStream;
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import java.io.PrintWriter;
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import java.security.NoSuchAlgorithmException;
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import java.security.SecureRandom;
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import java.security.spec.InvalidKeySpecException;
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import java.util.ArrayList;
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import java.util.Arrays;
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import java.util.Collections;
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import java.util.List;
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import java.util.concurrent.atomic.AtomicBoolean;
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import java.util.zip.GZIPOutputStream;
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import javax.crypto.Cipher;
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import javax.crypto.CipherOutputStream;
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import javax.crypto.SecretKeyFactory;
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import javax.crypto.spec.IvParameterSpec;
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import javax.crypto.spec.PBEKeySpec;
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import javax.crypto.spec.SecretKeySpec;
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import eu.siacs.conversations.Config;
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import eu.siacs.conversations.R;
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import eu.siacs.conversations.crypto.axolotl.SQLiteAxolotlStore;
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import eu.siacs.conversations.entities.Account;
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import eu.siacs.conversations.entities.Conversation;
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import eu.siacs.conversations.entities.Message;
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import eu.siacs.conversations.persistance.DatabaseBackend;
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import eu.siacs.conversations.persistance.FileBackend;
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import eu.siacs.conversations.utils.BackupFileHeader;
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import eu.siacs.conversations.utils.Compatibility;
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public class ExportBackupService extends Service {
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public static final String KEYTYPE = "AES";
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public static final String CIPHERMODE = "AES/GCM/NoPadding";
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public static final String PROVIDER = "BC";
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public static final String MIME_TYPE = "application/vnd.conversations.backup";
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private static final int NOTIFICATION_ID = 19;
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private static final int PAGE_SIZE = 20;
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private static final AtomicBoolean RUNNING = new AtomicBoolean(false);
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private DatabaseBackend mDatabaseBackend;
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private List<Account> mAccounts;
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private NotificationManager notificationManager;
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private static List<Intent> getPossibleFileOpenIntents(final Context context, final String path) {
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//http://www.openintents.org/action/android-intent-action-view/file-directory
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//do not use 'vnd.android.document/directory' since this will trigger system file manager
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final Intent openIntent = new Intent(Intent.ACTION_VIEW);
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openIntent.addCategory(Intent.CATEGORY_DEFAULT);
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if (Compatibility.runsAndTargetsTwentyFour(context)) {
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openIntent.setType("resource/folder");
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} else {
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openIntent.setDataAndType(Uri.parse("file://" + path), "resource/folder");
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}
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openIntent.putExtra("org.openintents.extra.ABSOLUTE_PATH", path);
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final Intent amazeIntent = new Intent(Intent.ACTION_VIEW);
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amazeIntent.setDataAndType(Uri.parse("com.amaze.filemanager:" + path), "resource/folder");
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//will open a file manager at root and user can navigate themselves
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final Intent systemFallBack = new Intent(Intent.ACTION_VIEW);
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systemFallBack.addCategory(Intent.CATEGORY_DEFAULT);
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systemFallBack.setData(Uri.parse("content://com.android.externalstorage.documents/root/primary"));
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return Arrays.asList(openIntent, amazeIntent, systemFallBack);
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}
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private static void accountExport(final SQLiteDatabase db, final String uuid, final PrintWriter writer) {
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final StringBuilder builder = new StringBuilder();
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final Cursor accountCursor = db.query(Account.TABLENAME, null, Account.UUID + "=?", new String[]{uuid}, null, null, null);
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while (accountCursor != null && accountCursor.moveToNext()) {
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builder.append("INSERT INTO ").append(Account.TABLENAME).append("(");
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for (int i = 0; i < accountCursor.getColumnCount(); ++i) {
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if (i != 0) {
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builder.append(',');
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}
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builder.append(accountCursor.getColumnName(i));
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}
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builder.append(") VALUES(");
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for (int i = 0; i < accountCursor.getColumnCount(); ++i) {
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if (i != 0) {
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builder.append(',');
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}
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final String value = accountCursor.getString(i);
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if (value == null || Account.ROSTERVERSION.equals(accountCursor.getColumnName(i))) {
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builder.append("NULL");
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} else if (value.matches("\\d+")) {
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int intValue = Integer.parseInt(value);
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if (Account.OPTIONS.equals(accountCursor.getColumnName(i))) {
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intValue |= 1 << Account.OPTION_DISABLED;
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}
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builder.append(intValue);
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} else {
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DatabaseUtils.appendEscapedSQLString(builder, value);
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}
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}
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builder.append(")");
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builder.append(';');
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builder.append('\n');
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}
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if (accountCursor != null) {
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accountCursor.close();
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}
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writer.append(builder.toString());
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}
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private static void simpleExport(SQLiteDatabase db, String table, String column, String uuid, PrintWriter writer) {
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final Cursor cursor = db.query(table, null, column + "=?", new String[]{uuid}, null, null, null);
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while (cursor != null && cursor.moveToNext()) {
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writer.write(cursorToString(table, cursor, PAGE_SIZE));
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}
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if (cursor != null) {
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cursor.close();
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}
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}
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public static byte[] getKey(final String password, final byte[] salt) throws InvalidKeySpecException {
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final SecretKeyFactory factory;
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try {
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factory = SecretKeyFactory.getInstance("PBKDF2WithHmacSHA1");
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} catch (NoSuchAlgorithmException e) {
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throw new IllegalStateException(e);
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}
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return factory.generateSecret(new PBEKeySpec(password.toCharArray(), salt, 1024, 128)).getEncoded();
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}
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private static String cursorToString(final String table, final Cursor cursor, final int max) {
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return cursorToString(table, cursor, max, false);
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}
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private static String cursorToString(final String table, final Cursor cursor, int max, boolean ignore) {
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final boolean identities = SQLiteAxolotlStore.IDENTITIES_TABLENAME.equals(table);
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StringBuilder builder = new StringBuilder();
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builder.append("INSERT ");
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if (ignore) {
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builder.append("OR IGNORE ");
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}
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builder.append("INTO ").append(table).append("(");
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int skipColumn = -1;
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for (int i = 0; i < cursor.getColumnCount(); ++i) {
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final String name = cursor.getColumnName(i);
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if (identities && SQLiteAxolotlStore.TRUSTED.equals(name)) {
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skipColumn = i;
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continue;
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}
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if (i != 0) {
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builder.append(',');
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}
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builder.append(name);
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}
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builder.append(") VALUES");
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for (int i = 0; i < max; ++i) {
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if (i != 0) {
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builder.append(',');
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}
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appendValues(cursor, builder, skipColumn);
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if (i < max - 1 && !cursor.moveToNext()) {
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break;
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}
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}
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builder.append(';');
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builder.append('\n');
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return builder.toString();
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}
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private static void appendValues(final Cursor cursor, final StringBuilder builder, final int skipColumn) {
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builder.append("(");
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for (int i = 0; i < cursor.getColumnCount(); ++i) {
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if (i == skipColumn) {
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continue;
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}
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if (i != 0) {
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builder.append(',');
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}
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final String value = cursor.getString(i);
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if (value == null) {
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builder.append("NULL");
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} else if (value.matches("[0-9]+")) {
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builder.append(value);
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} else {
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DatabaseUtils.appendEscapedSQLString(builder, value);
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}
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}
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builder.append(")");
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}
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@Override
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public void onCreate() {
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mDatabaseBackend = DatabaseBackend.getInstance(getBaseContext());
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mAccounts = mDatabaseBackend.getAccounts();
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notificationManager = (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
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}
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@Override
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public int onStartCommand(Intent intent, int flags, int startId) {
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if (RUNNING.compareAndSet(false, true)) {
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new Thread(() -> {
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boolean success;
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List<File> files;
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try {
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files = export();
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success = true;
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} catch (final Exception e) {
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Log.d(Config.LOGTAG, "unable to create backup", e);
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success = false;
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files = Collections.emptyList();
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}
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stopForeground(true);
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RUNNING.set(false);
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if (success) {
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notifySuccess(files);
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}
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stopSelf();
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}).start();
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return START_STICKY;
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} else {
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Log.d(Config.LOGTAG, "ExportBackupService. ignoring start command because already running");
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}
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return START_NOT_STICKY;
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}
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private void messageExport(SQLiteDatabase db, String uuid, PrintWriter writer, Progress progress) {
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Cursor cursor = db.rawQuery("select messages.* from messages join conversations on conversations.uuid=messages.conversationUuid where conversations.accountUuid=?", new String[]{uuid});
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int size = cursor != null ? cursor.getCount() : 0;
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Log.d(Config.LOGTAG, "exporting " + size + " messages for account " + uuid);
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int i = 0;
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int p = 0;
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while (cursor != null && cursor.moveToNext()) {
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writer.write(cursorToString(Message.TABLENAME, cursor, PAGE_SIZE, false));
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if (i + PAGE_SIZE > size) {
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i = size;
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} else {
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i += PAGE_SIZE;
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}
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final int percentage = i * 100 / size;
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if (p < percentage) {
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p = percentage;
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notificationManager.notify(NOTIFICATION_ID, progress.build(p));
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}
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}
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if (cursor != null) {
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cursor.close();
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}
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}
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private List<File> export() throws Exception {
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NotificationCompat.Builder mBuilder = new NotificationCompat.Builder(getBaseContext(), "backup");
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mBuilder.setContentTitle(getString(R.string.notification_create_backup_title))
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.setSmallIcon(R.drawable.ic_archive_white_24dp)
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.setProgress(1, 0, false);
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startForeground(NOTIFICATION_ID, mBuilder.build());
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int count = 0;
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final int max = this.mAccounts.size();
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final SecureRandom secureRandom = new SecureRandom();
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final List<File> files = new ArrayList<>();
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Log.d(Config.LOGTAG, "starting backup for " + max + " accounts");
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for (final Account account : this.mAccounts) {
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final String password = account.getPassword();
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if (Strings.nullToEmpty(password).trim().isEmpty()) {
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Log.d(Config.LOGTAG, String.format("skipping backup for %s because password is empty. unable to encrypt", account.getJid().asBareJid()));
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continue;
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}
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Log.d(Config.LOGTAG, String.format("exporting data for account %s (%s)", account.getJid().asBareJid(), account.getUuid()));
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final byte[] IV = new byte[12];
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final byte[] salt = new byte[16];
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secureRandom.nextBytes(IV);
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secureRandom.nextBytes(salt);
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final BackupFileHeader backupFileHeader = new BackupFileHeader(getString(R.string.app_name), account.getJid(), System.currentTimeMillis(), IV, salt);
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final Progress progress = new Progress(mBuilder, max, count);
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final File file = new File(FileBackend.getBackupDirectory(this) + account.getJid().asBareJid().toEscapedString() + ".ceb");
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files.add(file);
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final File directory = file.getParentFile();
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if (directory != null && directory.mkdirs()) {
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Log.d(Config.LOGTAG, "created backup directory " + directory.getAbsolutePath());
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}
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final FileOutputStream fileOutputStream = new FileOutputStream(file);
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final DataOutputStream dataOutputStream = new DataOutputStream(fileOutputStream);
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backupFileHeader.write(dataOutputStream);
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dataOutputStream.flush();
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final Cipher cipher = Compatibility.twentyEight() ? Cipher.getInstance(CIPHERMODE) : Cipher.getInstance(CIPHERMODE, PROVIDER);
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final byte[] key = getKey(password, salt);
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SecretKeySpec keySpec = new SecretKeySpec(key, KEYTYPE);
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IvParameterSpec ivSpec = new IvParameterSpec(IV);
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cipher.init(Cipher.ENCRYPT_MODE, keySpec, ivSpec);
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CipherOutputStream cipherOutputStream = new CipherOutputStream(fileOutputStream, cipher);
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GZIPOutputStream gzipOutputStream = new GZIPOutputStream(cipherOutputStream);
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PrintWriter writer = new PrintWriter(gzipOutputStream);
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SQLiteDatabase db = this.mDatabaseBackend.getReadableDatabase();
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final String uuid = account.getUuid();
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accountExport(db, uuid, writer);
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simpleExport(db, Conversation.TABLENAME, Conversation.ACCOUNT, uuid, writer);
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messageExport(db, uuid, writer, progress);
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for (String table : Arrays.asList(SQLiteAxolotlStore.PREKEY_TABLENAME, SQLiteAxolotlStore.SIGNED_PREKEY_TABLENAME, SQLiteAxolotlStore.SESSION_TABLENAME, SQLiteAxolotlStore.IDENTITIES_TABLENAME)) {
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simpleExport(db, table, SQLiteAxolotlStore.ACCOUNT, uuid, writer);
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}
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writer.flush();
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writer.close();
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mediaScannerScanFile(file);
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Log.d(Config.LOGTAG, "written backup to " + file.getAbsoluteFile());
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count++;
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}
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return files;
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}
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private void mediaScannerScanFile(final File file) {
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final Intent intent = new Intent(Intent.ACTION_MEDIA_SCANNER_SCAN_FILE);
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intent.setData(Uri.fromFile(file));
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sendBroadcast(intent);
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}
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private void notifySuccess(final List<File> files) {
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final String path = FileBackend.getBackupDirectory(this);
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PendingIntent openFolderIntent = null;
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for (Intent intent : getPossibleFileOpenIntents(this, path)) {
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if (intent.resolveActivityInfo(getPackageManager(), 0) != null) {
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openFolderIntent = PendingIntent.getActivity(this, 189, intent, PendingIntent.FLAG_UPDATE_CURRENT);
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break;
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}
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}
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PendingIntent shareFilesIntent = null;
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if (files.size() > 0) {
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final Intent intent = new Intent(Intent.ACTION_SEND_MULTIPLE);
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ArrayList<Uri> uris = new ArrayList<>();
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for (File file : files) {
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uris.add(FileBackend.getUriForFile(this, file));
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}
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intent.putParcelableArrayListExtra(Intent.EXTRA_STREAM, uris);
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intent.addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION);
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intent.setType(MIME_TYPE);
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final Intent chooser = Intent.createChooser(intent, getString(R.string.share_backup_files));
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shareFilesIntent = PendingIntent.getActivity(this, 190, chooser, PendingIntent.FLAG_UPDATE_CURRENT);
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}
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NotificationCompat.Builder mBuilder = new NotificationCompat.Builder(getBaseContext(), "backup");
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mBuilder.setContentTitle(getString(R.string.notification_backup_created_title))
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.setContentText(getString(R.string.notification_backup_created_subtitle, path))
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.setStyle(new NotificationCompat.BigTextStyle().bigText(getString(R.string.notification_backup_created_subtitle, FileBackend.getBackupDirectory(this))))
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.setAutoCancel(true)
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.setContentIntent(openFolderIntent)
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.setSmallIcon(R.drawable.ic_archive_white_24dp);
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if (shareFilesIntent != null) {
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mBuilder.addAction(R.drawable.ic_share_white_24dp, getString(R.string.share_backup_files), shareFilesIntent);
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}
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notificationManager.notify(NOTIFICATION_ID, mBuilder.build());
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}
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@Override
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public IBinder onBind(Intent intent) {
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return null;
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}
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private static class Progress {
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private final NotificationCompat.Builder builder;
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private final int max;
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private final int count;
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private Progress(NotificationCompat.Builder builder, int max, int count) {
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this.builder = builder;
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this.max = max;
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this.count = count;
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}
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private Notification build(int percentage) {
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builder.setProgress(max * 100, count * 100 + percentage, false);
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return builder.build();
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}
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}
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}
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