738 lines
34 KiB
Java
738 lines
34 KiB
Java
/**
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*
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* Copyright 2018-2020 Paul Schaub, 2017-2020 Florian Schmaus.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package org.jivesoftware.smackx.ox;
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import static org.jivesoftware.smackx.ox.util.OpenPgpPubSubUtil.PEP_NODE_PUBLIC_KEYS;
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import static org.jivesoftware.smackx.ox.util.OpenPgpPubSubUtil.PEP_NODE_PUBLIC_KEYS_NOTIFY;
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import static org.jivesoftware.smackx.ox.util.OpenPgpPubSubUtil.publishPublicKey;
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import java.io.IOException;
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import java.security.InvalidAlgorithmParameterException;
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import java.security.NoSuchAlgorithmException;
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import java.security.NoSuchProviderException;
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import java.util.Date;
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import java.util.HashSet;
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import java.util.Map;
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import java.util.Set;
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import java.util.WeakHashMap;
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import java.util.logging.Level;
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import java.util.logging.Logger;
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import org.jivesoftware.smack.Manager;
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import org.jivesoftware.smack.SmackException;
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import org.jivesoftware.smack.XMPPConnection;
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import org.jivesoftware.smack.XMPPException;
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import org.jivesoftware.smack.chat2.Chat;
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import org.jivesoftware.smack.chat2.ChatManager;
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import org.jivesoftware.smack.packet.Message;
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import org.jivesoftware.smack.util.Async;
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import org.jivesoftware.smack.util.stringencoder.Base64;
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import org.jivesoftware.smack.xml.XmlPullParserException;
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import org.jivesoftware.smackx.disco.ServiceDiscoveryManager;
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import org.jivesoftware.smackx.ox.callback.backup.AskForBackupCodeCallback;
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import org.jivesoftware.smackx.ox.callback.backup.SecretKeyBackupSelectionCallback;
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import org.jivesoftware.smackx.ox.crypto.OpenPgpProvider;
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import org.jivesoftware.smackx.ox.element.CryptElement;
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import org.jivesoftware.smackx.ox.element.OpenPgpContentElement;
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import org.jivesoftware.smackx.ox.element.OpenPgpElement;
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import org.jivesoftware.smackx.ox.element.PubkeyElement;
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import org.jivesoftware.smackx.ox.element.PublicKeysListElement;
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import org.jivesoftware.smackx.ox.element.SecretkeyElement;
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import org.jivesoftware.smackx.ox.element.SignElement;
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import org.jivesoftware.smackx.ox.element.SigncryptElement;
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import org.jivesoftware.smackx.ox.exception.InvalidBackupCodeException;
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import org.jivesoftware.smackx.ox.exception.MissingOpenPgpKeyException;
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import org.jivesoftware.smackx.ox.exception.MissingUserIdOnKeyException;
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import org.jivesoftware.smackx.ox.exception.NoBackupFoundException;
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import org.jivesoftware.smackx.ox.listener.CryptElementReceivedListener;
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import org.jivesoftware.smackx.ox.listener.SignElementReceivedListener;
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import org.jivesoftware.smackx.ox.listener.SigncryptElementReceivedListener;
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import org.jivesoftware.smackx.ox.store.definition.OpenPgpStore;
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import org.jivesoftware.smackx.ox.store.definition.OpenPgpTrustStore;
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import org.jivesoftware.smackx.ox.util.OpenPgpPubSubUtil;
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import org.jivesoftware.smackx.ox.util.SecretKeyBackupHelper;
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import org.jivesoftware.smackx.pep.PepEventListener;
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import org.jivesoftware.smackx.pep.PepListener;
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import org.jivesoftware.smackx.pep.PepManager;
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import org.jivesoftware.smackx.pubsub.LeafNode;
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import org.jivesoftware.smackx.pubsub.PubSubException;
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import org.jivesoftware.smackx.pubsub.PubSubFeature;
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import org.bouncycastle.openpgp.PGPException;
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import org.bouncycastle.openpgp.PGPPublicKeyRing;
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import org.bouncycastle.openpgp.PGPSecretKeyRing;
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import org.bouncycastle.openpgp.PGPSecretKeyRingCollection;
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import org.jxmpp.jid.BareJid;
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import org.jxmpp.jid.EntityBareJid;
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import org.pgpainless.key.OpenPgpV4Fingerprint;
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import org.pgpainless.key.protection.SecretKeyRingProtector;
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import org.pgpainless.key.util.KeyRingUtils;
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/**
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* Entry point for Smacks API for OpenPGP for XMPP.
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*
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* <h2>Setup</h2>
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*
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* In order to use OpenPGP for XMPP in Smack, just follow the following procedure.<br>
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* <br>
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* First, acquire an instance of the {@link OpenPgpManager} for your {@link XMPPConnection} using
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* {@link #getInstanceFor(XMPPConnection)}.
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*
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* <pre>
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* {@code
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* OpenPgpManager openPgpManager = OpenPgpManager.getInstanceFor(connection);
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* }
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* </pre>
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*
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* You also need an {@link OpenPgpProvider}, as well as an {@link OpenPgpStore}.
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* The provider must be registered using {@link #setOpenPgpProvider(OpenPgpProvider)}.
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*
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* <pre>
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* {@code
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* OpenPgpStore store = new FileBasedOpenPgpStore(storePath);
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* OpenPgpProvider provider = new PainlessOpenPgpProvider(connection, store);
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* openPgpManager.setOpenPgpProvider(provider);
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* }
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* </pre>
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*
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* It is also advised to register a custom {@link SecretKeyRingProtector} using
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* {@link OpenPgpStore#setKeyRingProtector(SecretKeyRingProtector)} in order to be able to handle password protected
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* secret keys.<br>
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* <br>
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* Speaking of keys, you can now check, if you have any keys available in your {@link OpenPgpStore} by doing
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* {@link #hasSecretKeysAvailable()}.<br>
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* <br>
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* If you do, you can now announce support for OX and publish those keys using {@link #announceSupportAndPublish()}.<br>
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* <br>
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* Otherwise, you can either generate fresh keys using {@link #generateAndImportKeyPair(BareJid)},
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* or try to restore a secret key backup from your private PubSub node by doing
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* {@link #restoreSecretKeyServerBackup(AskForBackupCodeCallback)}.<br>
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* <br>
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* In any case you should still do an {@link #announceSupportAndPublish()} afterwards.
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* <br>
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* <br>
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* Contacts are represented by {@link OpenPgpContact}s in the context of OpenPGP for XMPP. You can get those by using
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* {@link #getOpenPgpContact(EntityBareJid)}. The main function of {@link OpenPgpContact}s is to bundle information
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* about the OpenPGP capabilities of a contact in one spot. The pendant to the {@link OpenPgpContact} is the
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* {@link OpenPgpSelf}, which encapsulates your own OpenPGP identity. Both classes can be used to acquire information
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* about the OpenPGP keys of a user.
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*
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* <h2>Elements</h2>
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*
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* OpenPGP for XMPP defines multiple different element classes which contain the users messages.
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* The outermost element is the {@link OpenPgpElement}, which contains an OpenPGP encrypted content element.
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*
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* The content can be either a {@link SignElement}, {@link CryptElement} or {@link SigncryptElement}, depending on the use-case.
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* Those content elements contain the actual payload. If an {@link OpenPgpElement} is decrypted, it will be returned in
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* form of an {@link OpenPgpMessage}, which represents the decrypted message + metadata.
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*
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* @see <a href="https://xmpp.org/extensions/xep-0373.html">
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* XEP-0373: OpenPGP for XMPP</a>
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*/
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public final class OpenPgpManager extends Manager {
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private static final Logger LOGGER = Logger.getLogger(OpenPgpManager.class.getName());
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/**
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* Map of instances.
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*/
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private static final Map<XMPPConnection, OpenPgpManager> INSTANCES = new WeakHashMap<>();
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/**
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* {@link OpenPgpProvider} responsible for processing keys, encrypting and decrypting messages and so on.
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*/
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private OpenPgpProvider provider;
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private final PepManager pepManager;
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private final Set<SigncryptElementReceivedListener> signcryptElementReceivedListeners = new HashSet<>();
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private final Set<SignElementReceivedListener> signElementReceivedListeners = new HashSet<>();
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private final Set<CryptElementReceivedListener> cryptElementReceivedListeners = new HashSet<>();
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@SuppressWarnings("UnnecessaryLambda")
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private final PepEventListener<PublicKeysListElement> pepPublicKeyListElementListener = (from, listElement, id, message) -> processPublicKeysListElement(from, listElement);;
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/**
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* Private constructor to avoid instantiation without putting the object into {@code INSTANCES}.
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*
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* @param connection xmpp connection.
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*/
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private OpenPgpManager(XMPPConnection connection) {
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super(connection);
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ChatManager.getInstanceFor(connection).addIncomingListener(this::incomingChatMessageListener);
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pepManager = PepManager.getInstanceFor(connection);
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}
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/**
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* Get the instance of the {@link OpenPgpManager} which belongs to the {@code connection}.
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*
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* @param connection xmpp connection.
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* @return instance of the manager.
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*/
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public static synchronized OpenPgpManager getInstanceFor(XMPPConnection connection) {
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OpenPgpManager manager = INSTANCES.get(connection);
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if (manager == null) {
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manager = new OpenPgpManager(connection);
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INSTANCES.put(connection, manager);
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}
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return manager;
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}
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/**
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* Return our own {@link BareJid}.
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*
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* @return our bareJid
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*
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* @throws SmackException.NotLoggedInException in case our connection is not logged in, which means our BareJid is unknown.
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*/
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public BareJid getJidOrThrow() throws SmackException.NotLoggedInException {
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throwIfNotAuthenticated();
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return connection().getUser().asEntityBareJidOrThrow();
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}
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/**
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* Set the {@link OpenPgpProvider} which will be used to process incoming OpenPGP elements,
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* as well as to execute cryptographic operations.
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*
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* @param provider OpenPgpProvider.
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*/
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public void setOpenPgpProvider(OpenPgpProvider provider) {
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this.provider = provider;
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}
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public OpenPgpProvider getOpenPgpProvider() {
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return provider;
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}
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/**
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* Get our OpenPGP self.
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*
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* @return self TODO javadoc me please
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* @throws SmackException.NotLoggedInException if we are not logged in
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*/
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public OpenPgpSelf getOpenPgpSelf() throws SmackException.NotLoggedInException {
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throwIfNoProviderSet();
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return new OpenPgpSelf(getJidOrThrow(), provider.getStore());
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}
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/**
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* Generate a fresh OpenPGP key pair, given we don't have one already.
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* Publish the public key to the Public Key Node and update the Public Key Metadata Node with our keys fingerprint.
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* Lastly register a {@link PepListener} which listens for updates to Public Key Metadata Nodes.
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*
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* @throws NoSuchAlgorithmException if we are missing an algorithm to generate a fresh key pair.
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* @throws NoSuchProviderException if we are missing a suitable {@link java.security.Provider}.
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* @throws InterruptedException if the thread gets interrupted.
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* @throws PubSubException.NotALeafNodeException if one of the PubSub nodes is not a {@link LeafNode}.
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* @throws XMPPException.XMPPErrorException in case of an XMPP protocol error.
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* @throws SmackException.NotConnectedException if we are not connected.
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* @throws SmackException.NoResponseException if the server doesn't respond.
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* @throws IOException IO is dangerous.
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* @throws InvalidAlgorithmParameterException if illegal algorithm parameters are used for key generation.
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* @throws SmackException.NotLoggedInException if we are not logged in.
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* @throws PGPException if something goes wrong during key loading/generating
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*/
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public void announceSupportAndPublish()
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throws NoSuchAlgorithmException, NoSuchProviderException, InterruptedException,
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PubSubException.NotALeafNodeException, XMPPException.XMPPErrorException,
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SmackException.NotConnectedException, SmackException.NoResponseException, IOException,
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InvalidAlgorithmParameterException, SmackException.NotLoggedInException, PGPException {
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throwIfNoProviderSet();
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throwIfNotAuthenticated();
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OpenPgpV4Fingerprint primaryFingerprint = getOurFingerprint();
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if (primaryFingerprint == null) {
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primaryFingerprint = generateAndImportKeyPair(getJidOrThrow());
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}
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// Create <pubkey/> element
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PubkeyElement pubkeyElement;
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try {
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pubkeyElement = createPubkeyElement(getJidOrThrow(), primaryFingerprint, new Date());
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} catch (MissingOpenPgpKeyException e) {
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throw new AssertionError("Cannot publish our public key, since it is missing (MUST NOT happen!)");
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}
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// publish it
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publishPublicKey(pepManager, pubkeyElement, primaryFingerprint);
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// Subscribe to public key changes
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pepManager.addPepEventListener(PEP_NODE_PUBLIC_KEYS, PublicKeysListElement.class, pepPublicKeyListElementListener);
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ServiceDiscoveryManager.getInstanceFor(connection())
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.addFeature(PEP_NODE_PUBLIC_KEYS_NOTIFY);
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}
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/**
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* Generate a fresh OpenPGP key pair and import it.
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*
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* @param ourJid our {@link BareJid}.
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* @return {@link OpenPgpV4Fingerprint} of the generated key.
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* @throws NoSuchAlgorithmException if the JVM doesn't support one of the used algorithms.
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* @throws InvalidAlgorithmParameterException if the used algorithm parameters are invalid.
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* @throws NoSuchProviderException if we are missing a cryptographic provider.
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* @throws PGPException PGP is brittle.
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* @throws IOException IO is dangerous.
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*/
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public OpenPgpV4Fingerprint generateAndImportKeyPair(BareJid ourJid)
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throws NoSuchAlgorithmException, InvalidAlgorithmParameterException, NoSuchProviderException,
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PGPException, IOException {
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throwIfNoProviderSet();
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OpenPgpStore store = provider.getStore();
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PGPSecretKeyRing keys = generateKeyRing(ourJid);
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importKeyRing(ourJid, keys);
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OpenPgpV4Fingerprint fingerprint = new OpenPgpV4Fingerprint(keys);
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store.setTrust(ourJid, fingerprint, OpenPgpTrustStore.Trust.trusted);
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return fingerprint;
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}
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public PGPSecretKeyRing generateKeyRing(BareJid ourJid)
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throws PGPException, NoSuchAlgorithmException, NoSuchProviderException, InvalidAlgorithmParameterException {
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throwIfNoProviderSet();
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PGPSecretKeyRing keys = provider.getStore().generateKeyRing(ourJid);
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return keys;
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}
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private void importKeyRing(BareJid ourJid, PGPSecretKeyRing secretKeys) throws IOException, PGPException {
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try {
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provider.getStore().importSecretKey(ourJid, secretKeys);
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provider.getStore().importPublicKey(ourJid, KeyRingUtils.publicKeyRingFrom(secretKeys));
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} catch (MissingUserIdOnKeyException e) {
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// This should never throw, since we set our jid literally one line above this comment.
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throw new AssertionError(e);
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}
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}
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/**
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* Return the upper-case hex encoded OpenPGP v4 fingerprint of our key pair.
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*
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* @return fingerprint.
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* @throws SmackException.NotLoggedInException in case we are not logged in.
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* @throws IOException IO is dangerous.
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* @throws PGPException PGP is brittle.
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*/
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public OpenPgpV4Fingerprint getOurFingerprint()
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throws SmackException.NotLoggedInException, IOException, PGPException {
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return getOpenPgpSelf().getSigningKeyFingerprint();
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}
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/**
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* Return an OpenPGP capable contact.
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* This object can be used as an entry point to OpenPGP related API.
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*
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* @param jid {@link BareJid} of the contact.
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* @return {@link OpenPgpContact}.
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*/
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public OpenPgpContact getOpenPgpContact(EntityBareJid jid) {
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throwIfNoProviderSet();
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return provider.getStore().getOpenPgpContact(jid);
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}
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/**
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* Return true, if we have a secret key available, otherwise false.
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*
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* @return true if secret key available
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*
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* @throws SmackException.NotLoggedInException If we are not logged in (we need to know our jid in order to look up
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* our keys in the key store.
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* @throws PGPException in case the keys in the store are damaged somehow.
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* @throws IOException IO is dangerous.
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*/
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public boolean hasSecretKeysAvailable() throws SmackException.NotLoggedInException, PGPException, IOException {
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throwIfNoProviderSet();
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return getOpenPgpSelf().hasSecretKeyAvailable();
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}
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/**
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* Determine, if we can sync secret keys using private PEP nodes as described in the XEP.
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* Requirements on the server side are support for PEP and support for the whitelist access model of PubSub.
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*
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* @see <a href="https://xmpp.org/extensions/xep-0373.html#synchro-pep">XEP-0373 §5</a>
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*
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* @param connection XMPP connection
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* @return true, if the server supports secret key backups, otherwise false.
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* @throws XMPPException.XMPPErrorException in case of an XMPP protocol error.
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* @throws SmackException.NotConnectedException if we are not connected.
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* @throws InterruptedException if the thread is interrupted.
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* @throws SmackException.NoResponseException if the server doesn't respond.
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*/
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public static boolean serverSupportsSecretKeyBackups(XMPPConnection connection)
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throws XMPPException.XMPPErrorException, SmackException.NotConnectedException, InterruptedException,
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SmackException.NoResponseException {
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return ServiceDiscoveryManager.getInstanceFor(connection)
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.serverSupportsFeature(PubSubFeature.access_whitelist.toString());
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}
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/**
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* Remove the metadata listener. This method is mainly used in tests.
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*/
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public void stopMetadataListener() {
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pepManager.removePepEventListener(pepPublicKeyListElementListener);
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}
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/**
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* Upload the encrypted secret key to a private PEP node.
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*
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* @see <a href="https://xmpp.org/extensions/xep-0373.html#synchro-pep">XEP-0373 §5</a>
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*
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* @param selectKeyCallback callback, which will receive the users choice of which keys will be backed up.
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* @return secret key passphrase used to encrypt the backup.
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*
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* @throws InterruptedException if the thread is interrupted.
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* @throws PubSubException.NotALeafNodeException if the private node is not a {@link LeafNode}.
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* @throws XMPPException.XMPPErrorException in case of an XMPP protocol error.
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* @throws SmackException.NotConnectedException if we are not connected.
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* @throws SmackException.NoResponseException if the server doesn't respond.
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* @throws SmackException.NotLoggedInException if we are not logged in.
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* @throws IOException IO is dangerous.
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* @throws SmackException.FeatureNotSupportedException if the server doesn't support the PubSub whitelist access model.
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* @throws PGPException PGP is brittle
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* @throws MissingOpenPgpKeyException in case we have no OpenPGP key pair to back up.
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*/
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public OpenPgpSecretKeyBackupPassphrase backupSecretKeyToServer(SecretKeyBackupSelectionCallback selectKeyCallback)
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throws InterruptedException, PubSubException.NotALeafNodeException,
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XMPPException.XMPPErrorException, SmackException.NotConnectedException, SmackException.NoResponseException,
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SmackException.NotLoggedInException, IOException,
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SmackException.FeatureNotSupportedException, PGPException, MissingOpenPgpKeyException {
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OpenPgpSecretKeyBackupPassphrase passphrase = SecretKeyBackupHelper.generateBackupPassword();
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backupSecretKeyToServer(selectKeyCallback, passphrase);
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return passphrase;
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}
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/**
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* Upload the encrypted secret key to a private PEP node.
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* The backup is encrypted using the provided secret key passphrase.
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*
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* @see <a href="https://xmpp.org/extensions/xep-0373.html#synchro-pep">XEP-0373 §5</a>
|
|
*
|
|
* @param selectKeyCallback callback, which will receive the users choice of which keys will be backed up.
|
|
* @param passphrase secret key passphrase
|
|
*
|
|
* @throws InterruptedException if the thread is interrupted.
|
|
* @throws PubSubException.NotALeafNodeException if the private node is not a {@link LeafNode}.
|
|
* @throws XMPPException.XMPPErrorException in case of an XMPP protocol error.
|
|
* @throws SmackException.NotConnectedException if we are not connected.
|
|
* @throws SmackException.NoResponseException if the server doesn't respond.
|
|
* @throws SmackException.NotLoggedInException if we are not logged in.
|
|
* @throws IOException IO is dangerous.
|
|
* @throws SmackException.FeatureNotSupportedException if the server doesn't support the PubSub whitelist access model.
|
|
* @throws PGPException PGP is brittle
|
|
* @throws MissingOpenPgpKeyException in case we have no OpenPGP key pair to back up.
|
|
*/
|
|
public void backupSecretKeyToServer(SecretKeyBackupSelectionCallback selectKeyCallback,
|
|
OpenPgpSecretKeyBackupPassphrase passphrase)
|
|
throws InterruptedException, PubSubException.NotALeafNodeException,
|
|
XMPPException.XMPPErrorException, SmackException.NotConnectedException, SmackException.NoResponseException,
|
|
SmackException.NotLoggedInException, IOException,
|
|
SmackException.FeatureNotSupportedException, PGPException, MissingOpenPgpKeyException {
|
|
throwIfNoProviderSet();
|
|
throwIfNotAuthenticated();
|
|
|
|
BareJid ownJid = connection().getUser().asBareJid();
|
|
|
|
PGPSecretKeyRingCollection secretKeyRings = provider.getStore().getSecretKeysOf(ownJid);
|
|
|
|
Set<OpenPgpV4Fingerprint> availableKeyPairs = new HashSet<>();
|
|
for (PGPSecretKeyRing ring : secretKeyRings) {
|
|
availableKeyPairs.add(new OpenPgpV4Fingerprint(ring));
|
|
}
|
|
|
|
Set<OpenPgpV4Fingerprint> selectedKeyPairs = selectKeyCallback.selectKeysToBackup(availableKeyPairs);
|
|
|
|
SecretkeyElement secretKey = SecretKeyBackupHelper.createSecretkeyElement(provider, ownJid, selectedKeyPairs, passphrase);
|
|
|
|
OpenPgpPubSubUtil.depositSecretKey(connection(), secretKey);
|
|
}
|
|
|
|
/**
|
|
* Delete the private {@link LeafNode} containing our secret key backup.
|
|
*
|
|
* @throws XMPPException.XMPPErrorException in case of an XMPP protocol error.
|
|
* @throws SmackException.NotConnectedException if we are not connected.
|
|
* @throws InterruptedException if the thread gets interrupted.
|
|
* @throws SmackException.NoResponseException if the server doesn't respond.
|
|
* @throws SmackException.NotLoggedInException if we are not logged in.
|
|
*/
|
|
public void deleteSecretKeyServerBackup()
|
|
throws XMPPException.XMPPErrorException, SmackException.NotConnectedException, InterruptedException,
|
|
SmackException.NoResponseException, SmackException.NotLoggedInException {
|
|
throwIfNotAuthenticated();
|
|
OpenPgpPubSubUtil.deleteSecretKeyNode(pepManager);
|
|
}
|
|
|
|
/**
|
|
* Fetch a secret key backup from the server and try to restore a selected secret key from it.
|
|
*
|
|
* @param codeCallback callback for prompting the user to provide the secret backup code.
|
|
* @return fingerprint of the restored secret key
|
|
*
|
|
* @throws InterruptedException if the thread gets interrupted.
|
|
* @throws PubSubException.NotALeafNodeException if the private node is not a {@link LeafNode}.
|
|
* @throws XMPPException.XMPPErrorException in case of an XMPP protocol error.
|
|
* @throws SmackException.NotConnectedException if we are not connected.
|
|
* @throws SmackException.NoResponseException if the server doesn't respond.
|
|
* @throws InvalidBackupCodeException if the user-provided backup code is invalid.
|
|
* @throws SmackException.NotLoggedInException if we are not logged in
|
|
* @throws IOException IO is dangerous
|
|
* @throws MissingUserIdOnKeyException if the key that is to be imported is missing a user-id with our jid
|
|
* @throws NoBackupFoundException if no secret key backup has been found
|
|
* @throws PGPException in case the restored secret key is damaged.
|
|
*/
|
|
public OpenPgpV4Fingerprint restoreSecretKeyServerBackup(AskForBackupCodeCallback codeCallback)
|
|
throws InterruptedException, PubSubException.NotALeafNodeException, XMPPException.XMPPErrorException,
|
|
SmackException.NotConnectedException, SmackException.NoResponseException,
|
|
InvalidBackupCodeException, SmackException.NotLoggedInException, IOException, MissingUserIdOnKeyException,
|
|
NoBackupFoundException, PGPException {
|
|
throwIfNoProviderSet();
|
|
throwIfNotAuthenticated();
|
|
SecretkeyElement backup = OpenPgpPubSubUtil.fetchSecretKey(pepManager);
|
|
if (backup == null) {
|
|
throw new NoBackupFoundException();
|
|
}
|
|
|
|
OpenPgpSecretKeyBackupPassphrase backupCode = codeCallback.askForBackupCode();
|
|
|
|
PGPSecretKeyRing secretKeys = SecretKeyBackupHelper.restoreSecretKeyBackup(backup, backupCode);
|
|
OpenPgpV4Fingerprint fingerprint = new OpenPgpV4Fingerprint(secretKeys);
|
|
provider.getStore().importSecretKey(getJidOrThrow(), secretKeys);
|
|
provider.getStore().importPublicKey(getJidOrThrow(), KeyRingUtils.publicKeyRingFrom(secretKeys));
|
|
|
|
getOpenPgpSelf().trust(fingerprint);
|
|
|
|
return new OpenPgpV4Fingerprint(secretKeys);
|
|
}
|
|
|
|
/*
|
|
Private stuff.
|
|
*/
|
|
|
|
private void processPublicKeysListElement(BareJid contact, PublicKeysListElement listElement) {
|
|
OpenPgpContact openPgpContact = getOpenPgpContact(contact.asEntityBareJidIfPossible());
|
|
try {
|
|
openPgpContact.updateKeys(connection(), listElement);
|
|
} catch (Exception e) {
|
|
LOGGER.log(Level.WARNING, "Could not update contacts keys", e);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Decrypt and or verify an {@link OpenPgpElement} and return the decrypted {@link OpenPgpMessage}.
|
|
*
|
|
* @param element {@link OpenPgpElement} containing the message.
|
|
* @param sender {@link OpenPgpContact} who sent the message.
|
|
*
|
|
* @return decrypted and/or verified message
|
|
*
|
|
* @throws SmackException.NotLoggedInException in case we aren't logged in (we need to know our jid)
|
|
* @throws IOException IO error (reading keys, streams etc)
|
|
* @throws PGPException in case of an PGP error
|
|
*/
|
|
public OpenPgpMessage decryptOpenPgpElement(OpenPgpElement element, OpenPgpContact sender)
|
|
throws SmackException.NotLoggedInException, IOException, PGPException {
|
|
return provider.decryptAndOrVerify(getAuthenticatedConnectionOrThrow(), element, getOpenPgpSelf(), sender);
|
|
}
|
|
|
|
private void incomingChatMessageListener(final EntityBareJid from, final Message message, Chat chat) {
|
|
Async.go(new Runnable() {
|
|
@Override
|
|
public void run() {
|
|
OpenPgpElement element = message.getExtension(OpenPgpElement.class);
|
|
if (element == null) {
|
|
// Message does not contain an OpenPgpElement -> discard
|
|
return;
|
|
}
|
|
|
|
OpenPgpContact contact = getOpenPgpContact(from);
|
|
|
|
OpenPgpMessage decrypted = null;
|
|
OpenPgpContentElement contentElement = null;
|
|
try {
|
|
decrypted = decryptOpenPgpElement(element, contact);
|
|
contentElement = decrypted.getOpenPgpContentElement();
|
|
} catch (PGPException e) {
|
|
LOGGER.log(Level.WARNING, "Could not decrypt incoming OpenPGP encrypted message", e);
|
|
} catch (XmlPullParserException | IOException e) {
|
|
LOGGER.log(Level.WARNING, "Invalid XML content of incoming OpenPGP encrypted message", e);
|
|
} catch (SmackException.NotLoggedInException e) {
|
|
LOGGER.log(Level.WARNING, "Cannot determine our JID, since we are not logged in.", e);
|
|
}
|
|
|
|
if (contentElement instanceof SigncryptElement) {
|
|
for (SigncryptElementReceivedListener l : signcryptElementReceivedListeners) {
|
|
l.signcryptElementReceived(contact, message, (SigncryptElement) contentElement,
|
|
decrypted.getMetadata());
|
|
}
|
|
return;
|
|
}
|
|
|
|
if (contentElement instanceof SignElement) {
|
|
for (SignElementReceivedListener l : signElementReceivedListeners) {
|
|
l.signElementReceived(contact, message, (SignElement) contentElement, decrypted.getMetadata());
|
|
}
|
|
return;
|
|
}
|
|
|
|
if (contentElement instanceof CryptElement) {
|
|
for (CryptElementReceivedListener l : cryptElementReceivedListeners) {
|
|
l.cryptElementReceived(contact, message, (CryptElement) contentElement,
|
|
decrypted.getMetadata());
|
|
}
|
|
return;
|
|
}
|
|
|
|
else {
|
|
throw new AssertionError("Invalid element received: " + contentElement.getClass().getName());
|
|
}
|
|
}
|
|
});
|
|
}
|
|
|
|
/**
|
|
* Create a {@link PubkeyElement} which contains the OpenPGP public key of {@code owner} which belongs to
|
|
* the {@link OpenPgpV4Fingerprint} {@code fingerprint}.
|
|
*
|
|
* @param owner owner of the public key
|
|
* @param fingerprint fingerprint of the key
|
|
* @param date date of creation of the element
|
|
* @return {@link PubkeyElement} containing the key
|
|
*
|
|
* @throws MissingOpenPgpKeyException if the public key notated by the fingerprint cannot be found
|
|
*/
|
|
private PubkeyElement createPubkeyElement(BareJid owner,
|
|
OpenPgpV4Fingerprint fingerprint,
|
|
Date date)
|
|
throws MissingOpenPgpKeyException, IOException, PGPException {
|
|
PGPPublicKeyRing ring = provider.getStore().getPublicKeyRing(owner, fingerprint);
|
|
if (ring != null) {
|
|
byte[] keyBytes = ring.getEncoded(true);
|
|
return createPubkeyElement(keyBytes, date);
|
|
}
|
|
throw new MissingOpenPgpKeyException(owner, fingerprint);
|
|
}
|
|
|
|
/**
|
|
* Create a {@link PubkeyElement} which contains the given {@code date} base64 encoded.
|
|
*
|
|
* @param bytes byte representation of an OpenPGP public key
|
|
* @param date date of creation of the element
|
|
* @return {@link PubkeyElement} containing the key
|
|
*/
|
|
private static PubkeyElement createPubkeyElement(byte[] bytes, Date date) {
|
|
String base64EncodedOpenPgpPubKey = Base64.encodeToString(bytes);
|
|
return new PubkeyElement(new PubkeyElement.PubkeyDataElement(base64EncodedOpenPgpPubKey), date);
|
|
}
|
|
|
|
/**
|
|
* Register a {@link SigncryptElementReceivedListener} on the {@link OpenPgpManager}.
|
|
* That listener will get informed whenever a {@link SigncryptElement} has been received and successfully decrypted.
|
|
*
|
|
* Note: This method is not intended for clients to listen for incoming {@link SigncryptElement}s.
|
|
* Instead its purpose is to allow easy extension of XEP-0373 for custom OpenPGP profiles such as
|
|
* OpenPGP for XMPP: Instant Messaging.
|
|
*
|
|
* @param listener listener that gets registered
|
|
*/
|
|
public void registerSigncryptReceivedListener(SigncryptElementReceivedListener listener) {
|
|
signcryptElementReceivedListeners.add(listener);
|
|
}
|
|
|
|
/**
|
|
* Unregister a prior registered {@link SigncryptElementReceivedListener}. That listener will no longer get
|
|
* informed about incoming decrypted {@link SigncryptElement}s.
|
|
*
|
|
* @param listener listener that gets unregistered
|
|
*/
|
|
void unregisterSigncryptElementReceivedListener(SigncryptElementReceivedListener listener) {
|
|
signcryptElementReceivedListeners.remove(listener);
|
|
}
|
|
|
|
/**
|
|
* Register a {@link SignElementReceivedListener} on the {@link OpenPgpManager}.
|
|
* That listener will get informed whenever a {@link SignElement} has been received and successfully verified.
|
|
*
|
|
* Note: This method is not intended for clients to listen for incoming {@link SignElement}s.
|
|
* Instead its purpose is to allow easy extension of XEP-0373 for custom OpenPGP profiles such as
|
|
* OpenPGP for XMPP: Instant Messaging.
|
|
*
|
|
* @param listener listener that gets registered
|
|
*/
|
|
void registerSignElementReceivedListener(SignElementReceivedListener listener) {
|
|
signElementReceivedListeners.add(listener);
|
|
}
|
|
|
|
/**
|
|
* Unregister a prior registered {@link SignElementReceivedListener}. That listener will no longer get
|
|
* informed about incoming decrypted {@link SignElement}s.
|
|
*
|
|
* @param listener listener that gets unregistered
|
|
*/
|
|
void unregisterSignElementReceivedListener(SignElementReceivedListener listener) {
|
|
signElementReceivedListeners.remove(listener);
|
|
}
|
|
|
|
/**
|
|
* Register a {@link CryptElementReceivedListener} on the {@link OpenPgpManager}.
|
|
* That listener will get informed whenever a {@link CryptElement} has been received and successfully decrypted.
|
|
*
|
|
* Note: This method is not intended for clients to listen for incoming {@link CryptElement}s.
|
|
* Instead its purpose is to allow easy extension of XEP-0373 for custom OpenPGP profiles such as
|
|
* OpenPGP for XMPP: Instant Messaging.
|
|
*
|
|
* @param listener listener that gets registered
|
|
*/
|
|
void registerCryptElementReceivedListener(CryptElementReceivedListener listener) {
|
|
cryptElementReceivedListeners.add(listener);
|
|
}
|
|
|
|
/**
|
|
* Unregister a prior registered {@link CryptElementReceivedListener}. That listener will no longer get
|
|
* informed about incoming decrypted {@link CryptElement}s.
|
|
*
|
|
* @param listener listener that gets unregistered
|
|
*/
|
|
void unregisterCryptElementReceivedListener(CryptElementReceivedListener listener) {
|
|
cryptElementReceivedListeners.remove(listener);
|
|
}
|
|
|
|
/**
|
|
* Throw an {@link IllegalStateException} if no {@link OpenPgpProvider} is set.
|
|
* The OpenPgpProvider is used to process information related to RFC-4880.
|
|
*/
|
|
private void throwIfNoProviderSet() {
|
|
if (provider == null) {
|
|
throw new IllegalStateException("No OpenPgpProvider set!");
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Throw a {@link org.jivesoftware.smack.SmackException.NotLoggedInException} if the {@link XMPPConnection} of this
|
|
* manager is not authenticated at this point.
|
|
*
|
|
* @throws SmackException.NotLoggedInException if we are not authenticated
|
|
*/
|
|
private void throwIfNotAuthenticated() throws SmackException.NotLoggedInException {
|
|
if (!connection().isAuthenticated()) {
|
|
throw new SmackException.NotLoggedInException();
|
|
}
|
|
}
|
|
}
|