| /* |
| * Copyright (C) 2017 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.utils; |
| |
| import static com.android.server.backup.RefactoredBackupManagerService.DEBUG; |
| import static com.android.server.backup.RefactoredBackupManagerService.TAG; |
| |
| import android.content.pm.ApplicationInfo; |
| import android.content.pm.PackageInfo; |
| import android.content.pm.PackageManager; |
| import android.content.pm.Signature; |
| import android.net.Uri; |
| import android.os.Process; |
| import android.util.Slog; |
| |
| import com.android.server.backup.FileMetadata; |
| import com.android.server.backup.restore.RestoreDeleteObserver; |
| import com.android.server.backup.restore.RestoreInstallObserver; |
| import com.android.server.backup.restore.RestorePolicy; |
| |
| import java.io.File; |
| import java.io.FileOutputStream; |
| import java.io.IOException; |
| import java.io.InputStream; |
| import java.util.HashMap; |
| |
| /** |
| * Utility methods used by {@link com.android.server.backup.restore.PerformAdbRestoreTask} and |
| * {@link com.android.server.backup.restore.FullRestoreEngine}. |
| */ |
| public class RestoreUtils { |
| /** |
| * Reads apk contents from input stream and installs the apk. |
| * |
| * @param instream - input stream to read apk data from. |
| * @param packageManager - {@link PackageManager} instance. |
| * @param installObserver - {@link RestoreInstallObserver} instance. |
| * @param deleteObserver - {@link RestoreDeleteObserver} instance. |
| * @param manifestSignatures - manifest signatures. |
| * @param packagePolicies - package policies. |
| * @param info - backup file info. |
| * @param installerPackage - installer package. |
| * @param bytesReadListener - listener to be called for counting bytes read. |
| * @param dataDir - directory where to create apk file. |
| * @return true if apk was successfully read and installed and false otherwise. |
| */ |
| // TODO: Refactor to get rid of unneeded params. |
| public static boolean installApk(InputStream instream, PackageManager packageManager, |
| RestoreInstallObserver installObserver, RestoreDeleteObserver deleteObserver, |
| HashMap<String, Signature[]> manifestSignatures, |
| HashMap<String, RestorePolicy> packagePolicies, |
| FileMetadata info, |
| String installerPackage, BytesReadListener bytesReadListener, |
| File dataDir) { |
| boolean okay = true; |
| |
| if (DEBUG) { |
| Slog.d(TAG, "Installing from backup: " + info.packageName); |
| } |
| |
| // The file content is an .apk file. Copy it out to a staging location and |
| // attempt to install it. |
| File apkFile = new File(dataDir, info.packageName); |
| try { |
| FileOutputStream apkStream = new FileOutputStream(apkFile); |
| byte[] buffer = new byte[32 * 1024]; |
| long size = info.size; |
| while (size > 0) { |
| long toRead = (buffer.length < size) ? buffer.length : size; |
| int didRead = instream.read(buffer, 0, (int) toRead); |
| if (didRead >= 0) { |
| bytesReadListener.onBytesRead(didRead); |
| } |
| apkStream.write(buffer, 0, didRead); |
| size -= didRead; |
| } |
| apkStream.close(); |
| |
| // make sure the installer can read it |
| apkFile.setReadable(true, false); |
| |
| // Now install it |
| Uri packageUri = Uri.fromFile(apkFile); |
| installObserver.reset(); |
| // TODO: PackageManager.installPackage() is deprecated, refactor. |
| packageManager.installPackage(packageUri, installObserver, |
| PackageManager.INSTALL_REPLACE_EXISTING | PackageManager.INSTALL_FROM_ADB, |
| installerPackage); |
| installObserver.waitForCompletion(); |
| |
| if (installObserver.getResult() != PackageManager.INSTALL_SUCCEEDED) { |
| // The only time we continue to accept install of data even if the |
| // apk install failed is if we had already determined that we could |
| // accept the data regardless. |
| if (packagePolicies.get(info.packageName) != RestorePolicy.ACCEPT) { |
| okay = false; |
| } |
| } else { |
| // Okay, the install succeeded. Make sure it was the right app. |
| boolean uninstall = false; |
| if (!installObserver.getPackageName().equals(info.packageName)) { |
| Slog.w(TAG, "Restore stream claimed to include apk for " |
| + info.packageName + " but apk was really " |
| + installObserver.getPackageName()); |
| // delete the package we just put in place; it might be fraudulent |
| okay = false; |
| uninstall = true; |
| } else { |
| try { |
| PackageInfo pkg = packageManager.getPackageInfo( |
| info.packageName, |
| PackageManager.GET_SIGNATURES); |
| if ((pkg.applicationInfo.flags & ApplicationInfo.FLAG_ALLOW_BACKUP) |
| == 0) { |
| Slog.w(TAG, "Restore stream contains apk of package " |
| + info.packageName |
| + " but it disallows backup/restore"); |
| okay = false; |
| } else { |
| // So far so good -- do the signatures match the manifest? |
| Signature[] sigs = manifestSignatures.get(info.packageName); |
| if (AppBackupUtils.signaturesMatch(sigs, pkg)) { |
| // If this is a system-uid app without a declared backup agent, |
| // don't restore any of the file data. |
| if ((pkg.applicationInfo.uid < Process.FIRST_APPLICATION_UID) |
| && (pkg.applicationInfo.backupAgentName == null)) { |
| Slog.w(TAG, "Installed app " + info.packageName |
| + " has restricted uid and no agent"); |
| okay = false; |
| } |
| } else { |
| Slog.w(TAG, "Installed app " + info.packageName |
| + " signatures do not match restore manifest"); |
| okay = false; |
| uninstall = true; |
| } |
| } |
| } catch (PackageManager.NameNotFoundException e) { |
| Slog.w(TAG, "Install of package " + info.packageName |
| + " succeeded but now not found"); |
| okay = false; |
| } |
| } |
| |
| // If we're not okay at this point, we need to delete the package |
| // that we just installed. |
| if (uninstall) { |
| deleteObserver.reset(); |
| packageManager.deletePackage( |
| installObserver.getPackageName(), |
| deleteObserver, 0); |
| deleteObserver.waitForCompletion(); |
| } |
| } |
| } catch (IOException e) { |
| Slog.e(TAG, "Unable to transcribe restored apk for install"); |
| okay = false; |
| } finally { |
| apkFile.delete(); |
| } |
| |
| return okay; |
| } |
| } |