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Diffstat (limited to 'src/main/java/de/thedevstack/conversationsplus/crypto/OtrService.java')
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diff --git a/src/main/java/de/thedevstack/conversationsplus/crypto/OtrService.java b/src/main/java/de/thedevstack/conversationsplus/crypto/OtrService.java
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+++ b/src/main/java/de/thedevstack/conversationsplus/crypto/OtrService.java
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+package de.thedevstack.conversationsplus.crypto;
+
+import java.math.BigInteger;
+import java.security.KeyFactory;
+import java.security.KeyPair;
+import java.security.KeyPairGenerator;
+import java.security.NoSuchAlgorithmException;
+import java.security.PrivateKey;
+import java.security.PublicKey;
+import java.security.spec.DSAPrivateKeySpec;
+import java.security.spec.DSAPublicKeySpec;
+import java.security.spec.InvalidKeySpecException;
+
+import org.json.JSONException;
+import org.json.JSONObject;
+
+import android.util.Log;
+
+import de.thedevstack.conversationsplus.Config;
+import de.thedevstack.conversationsplus.entities.Account;
+import de.thedevstack.conversationsplus.entities.Conversation;
+import de.thedevstack.conversationsplus.services.XmppConnectionService;
+import de.thedevstack.conversationsplus.utils.CryptoHelper;
+import de.thedevstack.conversationsplus.xmpp.chatstate.ChatState;
+import de.thedevstack.conversationsplus.xmpp.jid.InvalidJidException;
+import de.thedevstack.conversationsplus.xmpp.jid.Jid;
+import de.thedevstack.conversationsplus.xmpp.stanzas.MessagePacket;
+
+import net.java.otr4j.OtrEngineHost;
+import net.java.otr4j.OtrException;
+import net.java.otr4j.OtrPolicy;
+import net.java.otr4j.OtrPolicyImpl;
+import net.java.otr4j.crypto.OtrCryptoEngineImpl;
+import net.java.otr4j.crypto.OtrCryptoException;
+import net.java.otr4j.session.InstanceTag;
+import net.java.otr4j.session.SessionID;
+import net.java.otr4j.session.FragmenterInstructions;
+
+public class OtrService extends OtrCryptoEngineImpl implements OtrEngineHost {
+
+ private Account account;
+ private OtrPolicy otrPolicy;
+ private KeyPair keyPair;
+ private XmppConnectionService mXmppConnectionService;
+
+ public OtrService(XmppConnectionService service, Account account) {
+ this.account = account;
+ this.otrPolicy = new OtrPolicyImpl();
+ this.otrPolicy.setAllowV1(false);
+ this.otrPolicy.setAllowV2(true);
+ this.otrPolicy.setAllowV3(true);
+ this.keyPair = loadKey(account.getKeys());
+ this.mXmppConnectionService = service;
+ }
+
+ private KeyPair loadKey(JSONObject keys) {
+ if (keys == null) {
+ return null;
+ }
+ try {
+ BigInteger x = new BigInteger(keys.getString("otr_x"), 16);
+ BigInteger y = new BigInteger(keys.getString("otr_y"), 16);
+ BigInteger p = new BigInteger(keys.getString("otr_p"), 16);
+ BigInteger q = new BigInteger(keys.getString("otr_q"), 16);
+ BigInteger g = new BigInteger(keys.getString("otr_g"), 16);
+ KeyFactory keyFactory = KeyFactory.getInstance("DSA");
+ DSAPublicKeySpec pubKeySpec = new DSAPublicKeySpec(y, p, q, g);
+ DSAPrivateKeySpec privateKeySpec = new DSAPrivateKeySpec(x, p, q, g);
+ PublicKey publicKey = keyFactory.generatePublic(pubKeySpec);
+ PrivateKey privateKey = keyFactory.generatePrivate(privateKeySpec);
+ return new KeyPair(publicKey, privateKey);
+ } catch (JSONException e) {
+ return null;
+ } catch (NoSuchAlgorithmException e) {
+ return null;
+ } catch (InvalidKeySpecException e) {
+ return null;
+ }
+ }
+
+ private void saveKey() {
+ PublicKey publicKey = keyPair.getPublic();
+ PrivateKey privateKey = keyPair.getPrivate();
+ KeyFactory keyFactory;
+ try {
+ keyFactory = KeyFactory.getInstance("DSA");
+ DSAPrivateKeySpec privateKeySpec = keyFactory.getKeySpec(
+ privateKey, DSAPrivateKeySpec.class);
+ DSAPublicKeySpec publicKeySpec = keyFactory.getKeySpec(publicKey,
+ DSAPublicKeySpec.class);
+ this.account.setKey("otr_x", privateKeySpec.getX().toString(16));
+ this.account.setKey("otr_g", privateKeySpec.getG().toString(16));
+ this.account.setKey("otr_p", privateKeySpec.getP().toString(16));
+ this.account.setKey("otr_q", privateKeySpec.getQ().toString(16));
+ this.account.setKey("otr_y", publicKeySpec.getY().toString(16));
+ } catch (final NoSuchAlgorithmException | InvalidKeySpecException e) {
+ e.printStackTrace();
+ }
+
+ }
+
+ @Override
+ public void askForSecret(SessionID id, InstanceTag instanceTag, String question) {
+ try {
+ final Jid jid = Jid.fromSessionID(id);
+ Conversation conversation = this.mXmppConnectionService.find(this.account,jid);
+ if (conversation!=null) {
+ conversation.smp().hint = question;
+ conversation.smp().status = Conversation.Smp.STATUS_CONTACT_REQUESTED;
+ mXmppConnectionService.updateConversationUi();
+ }
+ } catch (InvalidJidException e) {
+ Log.d(Config.LOGTAG,account.getJid().toBareJid()+": smp in invalid session "+id.toString());
+ }
+ }
+
+ @Override
+ public void finishedSessionMessage(SessionID arg0, String arg1)
+ throws OtrException {
+
+ }
+
+ @Override
+ public String getFallbackMessage(SessionID arg0) {
+ return "I would like to start a private (OTR encrypted) conversation but your client doesn’t seem to support that";
+ }
+
+ @Override
+ public byte[] getLocalFingerprintRaw(SessionID arg0) {
+ try {
+ return getFingerprintRaw(getPublicKey());
+ } catch (OtrCryptoException e) {
+ return null;
+ }
+ }
+
+ public PublicKey getPublicKey() {
+ if (this.keyPair == null) {
+ return null;
+ }
+ return this.keyPair.getPublic();
+ }
+
+ @Override
+ public KeyPair getLocalKeyPair(SessionID arg0) throws OtrException {
+ if (this.keyPair == null) {
+ KeyPairGenerator kg;
+ try {
+ kg = KeyPairGenerator.getInstance("DSA");
+ this.keyPair = kg.genKeyPair();
+ this.saveKey();
+ mXmppConnectionService.databaseBackend.updateAccount(account);
+ } catch (NoSuchAlgorithmException e) {
+ Log.d(Config.LOGTAG,
+ "error generating key pair " + e.getMessage());
+ }
+ }
+ return this.keyPair;
+ }
+
+ @Override
+ public String getReplyForUnreadableMessage(SessionID arg0) {
+ // TODO Auto-generated method stub
+ return null;
+ }
+
+ @Override
+ public OtrPolicy getSessionPolicy(SessionID arg0) {
+ return otrPolicy;
+ }
+
+ @Override
+ public void injectMessage(SessionID session, String body)
+ throws OtrException {
+ MessagePacket packet = new MessagePacket();
+ packet.setFrom(account.getJid());
+ if (session.getUserID().isEmpty()) {
+ packet.setAttribute("to", session.getAccountID());
+ } else {
+ packet.setAttribute("to", session.getAccountID() + "/" + session.getUserID());
+ }
+ packet.setBody(body);
+ packet.addChild("private", "urn:xmpp:carbons:2");
+ packet.addChild("no-copy", "urn:xmpp:hints");
+ packet.addChild("no-permanent-store", "urn:xmpp:hints");
+ packet.addChild("no-permanent-storage", "urn:xmpp:hints");
+ try {
+ Jid jid = Jid.fromSessionID(session);
+ Conversation conversation = mXmppConnectionService.find(account,jid);
+ if (conversation != null && conversation.setOutgoingChatState(Config.DEFAULT_CHATSTATE)) {
+ if (mXmppConnectionService.sendChatStates()) {
+ packet.addChild(ChatState.toElement(conversation.getOutgoingChatState()));
+ }
+ }
+ } catch (final InvalidJidException ignored) {
+
+ }
+
+ packet.setType(MessagePacket.TYPE_CHAT);
+ account.getXmppConnection().sendMessagePacket(packet);
+ }
+
+ @Override
+ public void messageFromAnotherInstanceReceived(SessionID session) {
+ sendOtrErrorMessage(session, "Message from another OTR-instance received");
+ }
+
+ @Override
+ public void multipleInstancesDetected(SessionID arg0) {
+ // TODO Auto-generated method stub
+
+ }
+
+ @Override
+ public void requireEncryptedMessage(SessionID arg0, String arg1)
+ throws OtrException {
+ // TODO Auto-generated method stub
+
+ }
+
+ @Override
+ public void showError(SessionID arg0, String arg1) throws OtrException {
+ Log.d(Config.LOGTAG,"show error");
+ }
+
+ @Override
+ public void smpAborted(SessionID id) throws OtrException {
+ setSmpStatus(id, Conversation.Smp.STATUS_NONE);
+ }
+
+ private void setSmpStatus(SessionID id, int status) {
+ try {
+ final Jid jid = Jid.fromSessionID(id);
+ Conversation conversation = this.mXmppConnectionService.find(this.account,jid);
+ if (conversation!=null) {
+ conversation.smp().status = status;
+ mXmppConnectionService.updateConversationUi();
+ }
+ } catch (final InvalidJidException ignored) {
+
+ }
+ }
+
+ @Override
+ public void smpError(SessionID id, int arg1, boolean arg2)
+ throws OtrException {
+ setSmpStatus(id, Conversation.Smp.STATUS_NONE);
+ }
+
+ @Override
+ public void unencryptedMessageReceived(SessionID arg0, String arg1)
+ throws OtrException {
+ throw new OtrException(new Exception("unencrypted message received"));
+ }
+
+ @Override
+ public void unreadableMessageReceived(SessionID session) throws OtrException {
+ Log.d(Config.LOGTAG,"unreadable message received");
+ sendOtrErrorMessage(session, "You sent me an unreadable OTR-encrypted message");
+ }
+
+ public void sendOtrErrorMessage(SessionID session, String errorText) {
+ try {
+ Jid jid = Jid.fromSessionID(session);
+ Conversation conversation = mXmppConnectionService.find(account, jid);
+ String id = conversation == null ? null : conversation.getLastReceivedOtrMessageId();
+ if (id != null) {
+ MessagePacket packet = mXmppConnectionService.getMessageGenerator()
+ .generateOtrError(jid, id, errorText);
+ packet.setFrom(account.getJid());
+ mXmppConnectionService.sendMessagePacket(account,packet);
+ Log.d(Config.LOGTAG,packet.toString());
+ Log.d(Config.LOGTAG,account.getJid().toBareJid().toString()
+ +": unreadable OTR message in "+conversation.getName());
+ }
+ } catch (InvalidJidException e) {
+ return;
+ }
+ }
+
+ @Override
+ public void unverify(SessionID id, String arg1) {
+ setSmpStatus(id, Conversation.Smp.STATUS_FAILED);
+ }
+
+ @Override
+ public void verify(SessionID id, String fingerprint, boolean approved) {
+ Log.d(Config.LOGTAG,"OtrService.verify("+id.toString()+","+fingerprint+","+String.valueOf(approved)+")");
+ try {
+ final Jid jid = Jid.fromSessionID(id);
+ Conversation conversation = this.mXmppConnectionService.find(this.account,jid);
+ if (conversation!=null) {
+ if (approved) {
+ conversation.getContact().addOtrFingerprint(fingerprint);
+ }
+ conversation.smp().hint = null;
+ conversation.smp().status = Conversation.Smp.STATUS_VERIFIED;
+ mXmppConnectionService.updateConversationUi();
+ mXmppConnectionService.syncRosterToDisk(conversation.getAccount());
+ }
+ } catch (final InvalidJidException ignored) {
+ }
+ }
+
+ @Override
+ public FragmenterInstructions getFragmenterInstructions(SessionID sessionID) {
+ return null;
+ }
+
+}