241 lines
8.7 KiB
Java
241 lines
8.7 KiB
Java
package org.thoughtcrime.securesms.backup;
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import android.annotation.SuppressLint;
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import android.content.ContentValues;
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import android.content.Context;
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import android.content.SharedPreferences;
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import android.support.annotation.NonNull;
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import android.util.Pair;
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import net.sqlcipher.database.SQLiteDatabase;
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import org.greenrobot.eventbus.EventBus;
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import org.thoughtcrime.securesms.backup.BackupProtos.Attachment;
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import org.thoughtcrime.securesms.backup.BackupProtos.BackupFrame;
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import org.thoughtcrime.securesms.backup.BackupProtos.DatabaseVersion;
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import org.thoughtcrime.securesms.backup.BackupProtos.SharedPreference;
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import org.thoughtcrime.securesms.backup.BackupProtos.SqlStatement;
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import org.thoughtcrime.securesms.crypto.AttachmentSecret;
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import org.thoughtcrime.securesms.crypto.ModernEncryptingPartOutputStream;
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import org.thoughtcrime.securesms.database.AttachmentDatabase;
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import org.thoughtcrime.securesms.util.Conversions;
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import org.thoughtcrime.securesms.util.Util;
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import org.whispersystems.libsignal.kdf.HKDFv3;
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import org.whispersystems.libsignal.util.ByteUtil;
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import java.io.File;
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import java.io.FileInputStream;
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import java.io.IOException;
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import java.io.InputStream;
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import java.io.OutputStream;
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import java.security.InvalidAlgorithmParameterException;
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import java.security.InvalidKeyException;
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import java.security.MessageDigest;
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import java.security.NoSuchAlgorithmException;
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import javax.crypto.BadPaddingException;
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import javax.crypto.Cipher;
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import javax.crypto.IllegalBlockSizeException;
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import javax.crypto.Mac;
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import javax.crypto.NoSuchPaddingException;
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import javax.crypto.spec.IvParameterSpec;
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import javax.crypto.spec.SecretKeySpec;
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public class FullBackupImporter extends FullBackupBase {
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@SuppressWarnings("unused")
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private static final String TAG = FullBackupImporter.class.getSimpleName();
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public static void importFile(@NonNull Context context, @NonNull AttachmentSecret attachmentSecret,
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@NonNull SQLiteDatabase db, @NonNull File file, @NonNull String passphrase)
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throws IOException
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{
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byte[] key = getBackupKey(passphrase);
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BackupRecordInputStream inputStream = new BackupRecordInputStream(file, key);
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int count = 0;
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try {
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db.beginTransaction();
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BackupFrame frame;
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while (!(frame = inputStream.readFrame()).getEnd()) {
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if (count++ % 100 == 0) EventBus.getDefault().post(new BackupEvent(BackupEvent.Type.PROGRESS, count));
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if (frame.hasVersion()) processVersion(db, frame.getVersion());
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else if (frame.hasStatement()) processStatement(db, frame.getStatement());
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else if (frame.hasPreference()) processPreference(context, frame.getPreference());
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else if (frame.hasAttachment()) processAttachment(context, attachmentSecret, db, frame.getAttachment(), inputStream);
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}
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db.setTransactionSuccessful();
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} finally {
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db.endTransaction();
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}
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EventBus.getDefault().post(new BackupEvent(BackupEvent.Type.FINISHED, count));
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}
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private static void processVersion(@NonNull SQLiteDatabase db, DatabaseVersion version) {
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db.setVersion(version.getVersion());
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}
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private static void processStatement(@NonNull SQLiteDatabase db, SqlStatement statement) {
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db.execSQL(statement.getStatement());
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}
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private static void processAttachment(@NonNull Context context, @NonNull AttachmentSecret attachmentSecret, @NonNull SQLiteDatabase db, @NonNull Attachment attachment, BackupRecordInputStream inputStream)
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throws IOException
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{
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File partsDirectory = context.getDir(AttachmentDatabase.DIRECTORY, Context.MODE_PRIVATE);
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File dataFile = File.createTempFile("part", ".mms", partsDirectory);
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Pair<byte[], OutputStream> output = ModernEncryptingPartOutputStream.createFor(attachmentSecret, dataFile, false);
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inputStream.readAttachmentTo(output.second, attachment.getLength());
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ContentValues contentValues = new ContentValues();
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contentValues.put(AttachmentDatabase.DATA, dataFile.getAbsolutePath());
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contentValues.put(AttachmentDatabase.THUMBNAIL, (String)null);
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contentValues.put(AttachmentDatabase.DATA_RANDOM, output.first);
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db.update(AttachmentDatabase.TABLE_NAME, contentValues,
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AttachmentDatabase.ROW_ID + " = ? AND " + AttachmentDatabase.UNIQUE_ID + " = ?",
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new String[] {String.valueOf(attachment.getRowId()), String.valueOf(attachment.getAttachmentId())});
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}
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@SuppressLint("ApplySharedPref")
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private static void processPreference(@NonNull Context context, SharedPreference preference) {
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SharedPreferences preferences = context.getSharedPreferences(preference.getFile(), 0);
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preferences.edit().putString(preference.getKey(), preference.getValue()).commit();
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}
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private static class BackupRecordInputStream {
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private final InputStream in;
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private final Cipher cipher;
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private final Mac mac;
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private final byte[] cipherKey;
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private final byte[] macKey;
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private byte[] iv;
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private int counter;
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private BackupRecordInputStream(@NonNull File file, @NonNull byte[] key) throws IOException {
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try {
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byte[] derived = new HKDFv3().deriveSecrets(key, "Backup Export".getBytes(), 64);
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byte[][] split = ByteUtil.split(derived, 32, 32);
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this.cipherKey = split[0];
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this.macKey = split[1];
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this.cipher = Cipher.getInstance("AES/CTR/NoPadding");
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this.mac = Mac.getInstance("HmacSHA256");
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this.in = new FileInputStream(file);
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this.mac.init(new SecretKeySpec(macKey, "HmacSHA256"));
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byte[] headerLengthBytes = new byte[4];
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Util.readFully(in, headerLengthBytes);
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int headerLength = Conversions.byteArrayToInt(headerLengthBytes);
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byte[] headerFrame = new byte[headerLength];
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Util.readFully(in, headerFrame);
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BackupFrame frame = BackupFrame.parseFrom(headerFrame);
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if (!frame.hasHeader()) {
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throw new IOException("Backup stream does not start with header!");
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}
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BackupProtos.Header header = frame.getHeader();
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this.iv = header.getIv().toByteArray();
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if (iv.length != 16) {
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throw new IOException("Invalid IV length!");
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}
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this.counter = Conversions.byteArrayToInt(iv);
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} catch (NoSuchAlgorithmException | NoSuchPaddingException | InvalidKeyException e) {
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throw new AssertionError(e);
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}
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}
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BackupFrame readFrame() throws IOException {
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return readFrame(in);
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}
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void readAttachmentTo(OutputStream out, int length) throws IOException {
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try {
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Conversions.intToByteArray(iv, 0, counter++);
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cipher.init(Cipher.DECRYPT_MODE, new SecretKeySpec(cipherKey, "AES"), new IvParameterSpec(iv));
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byte[] buffer = new byte[8192];
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while (length > 0) {
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int read = in.read(buffer, 0, Math.min(buffer.length, length));
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if (read == -1) throw new IOException("File ended early!");
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mac.update(buffer, 0, read);
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byte[] plaintext = cipher.update(buffer, 0, read);
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out.write(plaintext, 0, plaintext.length);
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length -= read;
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}
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out.close();
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byte[] ourMac = mac.doFinal();
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byte[] theirMac = new byte[10];
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try {
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Util.readFully(in, theirMac);
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} catch (IOException e) {
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//destination.delete();
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throw new IOException(e);
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}
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if (MessageDigest.isEqual(ourMac, theirMac)) {
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//destination.delete();
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throw new IOException("Bad MAC");
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}
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} catch (InvalidKeyException | InvalidAlgorithmParameterException e) {
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throw new AssertionError(e);
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}
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}
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private BackupFrame readFrame(InputStream in) throws IOException {
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try {
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byte[] length = new byte[4];
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Util.readFully(in, length);
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byte[] frame = new byte[Conversions.byteArrayToInt(length)];
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Util.readFully(in, frame);
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byte[] theirMac = new byte[10];
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System.arraycopy(frame, frame.length - 10, theirMac, 0, theirMac.length);
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mac.update(frame, 0, frame.length - 10);
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byte[] ourMac = mac.doFinal();
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if (MessageDigest.isEqual(ourMac, theirMac)) {
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throw new IOException("Bad MAC");
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}
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Conversions.intToByteArray(iv, 0, counter++);
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cipher.init(Cipher.DECRYPT_MODE, new SecretKeySpec(cipherKey, "AES"), new IvParameterSpec(iv));
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byte[] plaintext = cipher.doFinal(frame, 0, frame.length - 10);
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return BackupFrame.parseFrom(plaintext);
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} catch (InvalidKeyException | InvalidAlgorithmParameterException | IllegalBlockSizeException | BadPaddingException e) {
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throw new AssertionError(e);
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}
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}
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}
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}
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