/* * The MIT License * * Copyright 2015 Ahseya. * * Permission is hereby granted, free of charge, to any person obtaining a copy * of this software and associated documentation files (the "Software"), to deal * in the Software without restriction, including without limitation the rights * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell * copies of the Software, and to permit persons to whom the Software is * furnished to do so, subject to the following conditions: * * The above copyright notice and this permission notice shall be included in * all copies or substantial portions of the Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN * THE SOFTWARE. */ package com.github.horrorho.liquiddonkey.cloud.keybag; import com.github.horrorho.liquiddonkey.cloud.protobuf.ICloud; import com.github.horrorho.liquiddonkey.exception.BadDataException; import com.github.horrorho.liquiddonkey.settings.Markers; import com.github.horrorho.liquiddonkey.util.Bytes; import com.google.protobuf.ByteString; import java.util.HashMap; import java.util.Map; import net.jcip.annotations.Immutable; import net.jcip.annotations.ThreadSafe; import org.slf4j.Logger; import org.slf4j.LoggerFactory; import org.slf4j.Marker; import org.slf4j.MarkerFactory; /** * KeyBagManager. * * @author ahseya */ @Immutable @ThreadSafe public final class KeyBagManager { /** * Returns a new unlocked KeyBagManager instance. * * @param keySet the key set, not null * @return a new unlocked KeyBagManager instance, not null * @throws BadDataException if the KeyBagManager cannot be unlocked or a data handling error occurred */ public static KeyBagManager from(ICloud.MBSKeySet keySet) throws BadDataException { logger.trace("<< from() < keySet count: {}", keySet.getKeyCount()); logger.debug(marker, "<-- from() < keySet: {}", keySet); if (keySet.getKeyCount() < 2) { throw new BadDataException("Bad keybag."); } ByteString passCode = keySet.getKey(0).getKeyData(); Map<ByteString, KeyBag> uuidToKeyBag = new HashMap<>(); for (int i = 1; i < keySet.getKeyCount(); i++) { KeyBag keyBag = KeyBagFactory.from(keySet.getKey(i), passCode); uuidToKeyBag.put(keyBag.uuid(), keyBag); } KeyBagManager instance = new KeyBagManager(uuidToKeyBag, FileKeyFactory.create()); logger.debug(marker, "-- from() > {}", uuidToKeyBag); logger.trace(">> from() > {}", instance); return instance; } private static final Logger logger = LoggerFactory.getLogger(KeyBagManager.class); private static final Marker marker = MarkerFactory.getMarker(Markers.KEYBAG); private final Map<ByteString, KeyBag> uuidToKeyBag; private final FileKeyFactory fileKeyFactory; KeyBagManager(Map<ByteString, KeyBag> uuidToKeyBag, FileKeyFactory fileKeyFactory) { this.uuidToKeyBag = uuidToKeyBag; this.fileKeyFactory = fileKeyFactory; } public ByteString fileKey(ICloud.MBSFile file) { ICloud.MBSFileAttributes fileAttributes = file.getAttributes(); if (!fileAttributes.hasEncryptionKey()) { logger.warn("-- fileKey() > no encryption key: {}", file.getRelativePath()); return null; } ByteString uuid = fileAttributes.getEncryptionKey().substring(0, 0x10); KeyBag keyBag = uuidToKeyBag.get(uuid); if (keyBag == null) { logger.warn("-- fileKey() > no key bag for uuid: {}", Bytes.hex(uuid)); return null; } else { return fileKeyFactory.fileKey(keyBag, file); } } @Override public String toString() { return "KeyBagManager{" + "uuids=" + uuidToKeyBag.keySet() + '}'; } }