578 lines
26 KiB
Java
578 lines
26 KiB
Java
/*
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* This is the source code of Telegram for Android v. 1.3.2.
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* It is licensed under GNU GPL v. 2 or later.
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* You should have received a copy of the license in this archive (see LICENSE).
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*
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* Copyright Nikolai Kudashov, 2013.
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*/
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package org.telegram.messenger;
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import org.telegram.TL.TLClassStore;
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import org.telegram.TL.TLObject;
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import org.telegram.TL.TLRPC;
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import java.math.BigInteger;
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import java.nio.ByteBuffer;
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import java.util.ArrayList;
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import java.util.Arrays;
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import java.util.HashMap;
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import java.util.Locale;
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public class HandshakeAction extends Action implements TcpConnection.TcpConnectionDelegate {
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private ArrayList<Long> processedMessageIds;
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private byte[] authNonce;
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private byte[] authServerNonce;
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private byte[] authNewNonce;
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private byte[] authKey;
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private byte[] authKeyId;
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private boolean processedPQRes;
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private byte[] reqPQMsgData;
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private byte[] reqDHMsgData;
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private byte[] setClientDHParamsMsgData;
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private boolean wasDisconnect = false;
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private long lastOutgoingMessageId;
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int timeDifference;
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ServerSalt serverSalt;
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public Datacenter datacenter;
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public HandshakeAction(Datacenter datacenter) {
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this.datacenter = datacenter;
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}
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public void execute(HashMap params) {
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FileLog.d("tmessages", String.format(Locale.US, "Begin handshake with DC%d", datacenter.datacenterId));
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beginHandshake(true);
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}
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void beginHandshake(boolean dropConnection) {
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if (datacenter.connection == null) {
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datacenter.connection = new TcpConnection(datacenter.datacenterId);
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datacenter.connection.delegate = this;
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datacenter.connection.transportRequestClass = RPCRequest.RPCRequestClassGeneric;
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}
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processedMessageIds = new ArrayList<Long>();
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authNonce = null;
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authServerNonce = null;
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authNewNonce = null;
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authKey = null;
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authKeyId = null;
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processedPQRes = false;
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reqPQMsgData = null;
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reqDHMsgData = null;
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setClientDHParamsMsgData = null;
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if (dropConnection) {
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datacenter.connection.suspendConnection(true);
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datacenter.connection.connect();
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}
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TLRPC.TL_req_pq reqPq = new TLRPC.TL_req_pq();
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byte[] nonceBytes = new byte[16];
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for (int a = 0; a < 16; a++) {
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nonceBytes[a] = (byte)(MessagesController.random.nextDouble() * 255);
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}
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authNonce = reqPq.nonce = nonceBytes;
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reqPQMsgData = sendMessageData(reqPq, generateMessageId());
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}
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final Integer lock = 1;
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static ArrayList<HashMap<String, Object>> serverPublicKeys = null;
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HashMap<String, Object> selectPublicKey(ArrayList<Long> fingerprints) {
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synchronized (lock) {
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if (serverPublicKeys == null) {
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serverPublicKeys = new ArrayList<HashMap<String, Object>>();
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HashMap<String, Object> map;
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map = new HashMap<String, Object>();
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map.put("key", new BigInteger[]{
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new BigInteger("c150023e2f70db7985ded064759cfecf0af328e69a41daf4d6f01b538135" +
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"a6f91f8f8b2a0ec9ba9720ce352efcf6c5680ffc424bd634864902de0b4bd6d49f4e580230e" +
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"3ae97d95c8b19442b3c0a10d8f5633fecedd6926a7f6dab0ddb7d457f9ea81b8465fcd6fffe" +
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"ed114011df91c059caedaf97625f6c96ecc74725556934ef781d866b34f011fce4d835a0901" +
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"96e9a5f0e4449af7eb697ddb9076494ca5f81104a305b6dd27665722c46b60e5df680fb16b2" +
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"10607ef217652e60236c255f6a28315f4083a96791d7214bf64c1df4fd0db1944fb26a2a570" +
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"31b32eee64ad15a8ba68885cde74a5bfc920f6abf59ba5c75506373e7130f9042da922179251f", 16),
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new BigInteger("010001", 16)});
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map.put("fingerprint", 0xc3b42b026ce86b21L);
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serverPublicKeys.add(map);
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}
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}
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for (HashMap<String, Object> keyDesc : serverPublicKeys) {
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long keyFingerprint = (Long)keyDesc.get("fingerprint");
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for (long nFingerprint : fingerprints) {
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if (nFingerprint == keyFingerprint) {
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return keyDesc;
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}
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}
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}
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return null;
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}
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long generateMessageId() {
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long messageId = (long)((((double)System.currentTimeMillis()) * 4294967296.0) / 1000.0);
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if (messageId <= lastOutgoingMessageId) {
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messageId = lastOutgoingMessageId + 1;
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}
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while (messageId % 4 != 0) {
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messageId++;
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}
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lastOutgoingMessageId = messageId;
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return messageId;
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}
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byte[] sendMessageData(TLObject message, long messageId) {
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byte[] messageData;
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SerializedData innerOs = new SerializedData();
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message.serializeToStream(innerOs);
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messageData = innerOs.toByteArray();
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SerializedData messageOs = new SerializedData();
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messageOs.writeInt64(0);
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messageOs.writeInt64(messageId);
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messageOs.writeInt32(messageData.length);
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messageOs.writeRaw(messageData);
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byte[] transportData = messageOs.toByteArray();
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datacenter.connection.sendData(transportData, false, false);
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return transportData;
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}
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void processMessage(TLObject message, long messageId) {
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if (message instanceof TLRPC.TL_resPQ) {
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if (processedPQRes) {
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TLRPC.TL_msgs_ack msgsAck = new TLRPC.TL_msgs_ack();
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msgsAck.msg_ids = new ArrayList<Long>();
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msgsAck.msg_ids.add(messageId);
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sendMessageData(msgsAck, generateMessageId());
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return;
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}
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processedPQRes = true;
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final TLRPC.TL_resPQ resPq = (TLRPC.TL_resPQ)message;
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if (Arrays.equals(authNonce, resPq.nonce)) {
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final HashMap<String, Object> publicKey = selectPublicKey(resPq.server_public_key_fingerprints);
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if (publicKey == null) {
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FileLog.e("tmessages", "***** Couldn't find valid server public key");
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beginHandshake(false);
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return;
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}
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authServerNonce = resPq.server_nonce;
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ByteBuffer data = ByteBuffer.wrap(resPq.pq);
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final long pqf = data.getLong();
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final long messageIdf = messageId;
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Utilities.globalQueue.postRunnable(new Runnable() {
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@Override
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public void run() {
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final Utilities.TPFactorizedValue factorizedPq = Utilities.getFactorizedValue(pqf);
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Utilities.stageQueue.postRunnable(new Runnable() {
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@Override
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public void run() {
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ByteBuffer pBytes = ByteBuffer.allocate(4);
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pBytes.putInt((int)factorizedPq.p);
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byte[] pData = pBytes.array();
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ByteBuffer qBytes = ByteBuffer.allocate(4);
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qBytes.putInt((int)factorizedPq.q);
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byte[] qData = qBytes.array();
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TLRPC.TL_req_DH_params reqDH = new TLRPC.TL_req_DH_params();
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reqDH.nonce = authNonce;
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reqDH.server_nonce = authServerNonce;
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reqDH.p = pData;
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reqDH.q = qData;
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reqDH.public_key_fingerprint = (Long)publicKey.get("fingerprint");
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SerializedData os = new SerializedData();
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TLRPC.TL_p_q_inner_data innerData = new TLRPC.TL_p_q_inner_data();
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innerData.nonce = authNonce;
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innerData.server_nonce = authServerNonce;
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innerData.pq = resPq.pq;
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innerData.p = reqDH.p;
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innerData.q = reqDH.q;
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byte[] nonceBytes = new byte[32];
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for (int a = 0; a < 32; a++) {
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nonceBytes[a] = (byte)(MessagesController.random.nextDouble() * 255);
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}
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innerData.new_nonce = authNewNonce = nonceBytes;
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innerData.serializeToStream(os);
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byte[] innerDataBytes = os.toByteArray();
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SerializedData dataWithHash = new SerializedData();
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dataWithHash.writeRaw(Utilities.computeSHA1(innerDataBytes));
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dataWithHash.writeRaw(innerDataBytes);
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byte[] b = new byte[1];
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while (dataWithHash.length() < 255) {
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MessagesController.random.nextBytes(b);
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dataWithHash.writeByte(b[0]);
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}
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byte[] encryptedBytes = Utilities.encryptWithRSA((BigInteger[])publicKey.get("key"), dataWithHash.toByteArray());
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SerializedData encryptedData = new SerializedData();
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encryptedData.writeRaw(encryptedBytes);
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if (encryptedData.length() < 256) {
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SerializedData newEncryptedData = new SerializedData();
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for (int i = 0; i < 256 - encryptedData.length(); i++) {
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newEncryptedData.writeByte(0);
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}
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newEncryptedData.writeRaw(encryptedData.toByteArray());
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encryptedData = newEncryptedData;
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}
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reqDH.encrypted_data = encryptedData.toByteArray();
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TLRPC.TL_msgs_ack msgsAck = new TLRPC.TL_msgs_ack();
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msgsAck.msg_ids = new ArrayList<Long>();
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msgsAck.msg_ids.add(messageIdf);
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sendMessageData(msgsAck, generateMessageId());
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reqPQMsgData = null;
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reqDHMsgData = sendMessageData(reqDH, generateMessageId());
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}
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});
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}
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});
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} else {
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FileLog.e("tmessages", "***** Error: invalid handshake nonce");
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beginHandshake(false);
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}
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} else if (message instanceof TLRPC.Server_DH_Params) {
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if (message instanceof TLRPC.TL_server_DH_params_ok) {
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TLRPC.TL_server_DH_params_ok serverDhParams = (TLRPC.TL_server_DH_params_ok)message;
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SerializedData tmpAesKey = new SerializedData();
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SerializedData newNonceAndServerNonce = new SerializedData();
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newNonceAndServerNonce.writeRaw(authNewNonce);
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newNonceAndServerNonce.writeRaw(authServerNonce);
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SerializedData serverNonceAndNewNonce = new SerializedData();
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serverNonceAndNewNonce.writeRaw(authServerNonce);
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serverNonceAndNewNonce.writeRaw(authNewNonce);
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tmpAesKey.writeRaw(Utilities.computeSHA1(newNonceAndServerNonce.toByteArray()));
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byte[] serverNonceAndNewNonceHash = Utilities.computeSHA1(serverNonceAndNewNonce.toByteArray());
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byte[] serverNonceAndNewNonceHash0_12 = new byte[12];
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System.arraycopy(serverNonceAndNewNonceHash, 0, serverNonceAndNewNonceHash0_12, 0, 12);
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tmpAesKey.writeRaw(serverNonceAndNewNonceHash0_12);
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SerializedData tmpAesIv = new SerializedData();
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byte[] serverNonceAndNewNonceHash12_8 = new byte[8];
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System.arraycopy(serverNonceAndNewNonceHash, 12, serverNonceAndNewNonceHash12_8, 0, 8);
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tmpAesIv.writeRaw(serverNonceAndNewNonceHash12_8);
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SerializedData newNonceAndNewNonce = new SerializedData();
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newNonceAndNewNonce.writeRaw(authNewNonce);
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newNonceAndNewNonce.writeRaw(authNewNonce);
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tmpAesIv.writeRaw(Utilities.computeSHA1(newNonceAndNewNonce.toByteArray()));
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byte[] newNonce0_4 = new byte[4];
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System.arraycopy(authNewNonce, 0, newNonce0_4, 0, 4);
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tmpAesIv.writeRaw(newNonce0_4);
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byte[] answerWithHash = Utilities.aesIgeEncryption(serverDhParams.encrypted_answer, tmpAesKey.toByteArray(), tmpAesIv.toByteArray(), false, false);
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byte[] answerHash = new byte[20];
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System.arraycopy(answerWithHash, 0, answerHash, 0, 20);
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byte[] answerData = new byte[answerWithHash.length - 20];
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System.arraycopy(answerWithHash, 20, answerData, 0, answerWithHash.length - 20);
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boolean hashVerified = false;
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for (int i = 0; i < 16; i++) {
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byte[] computedAnswerHash = Utilities.computeSHA1(answerData);
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if (Arrays.equals(computedAnswerHash, answerHash)) {
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hashVerified = true;
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break;
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}
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byte[] answerData2 = new byte[answerData.length - 1];
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System.arraycopy(answerData, 0, answerData2, 0, answerData.length - 1);
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answerData = answerData2;
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}
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if (!hashVerified) {
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FileLog.e("tmessages", "***** Couldn't decode DH params");
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beginHandshake(false);
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return;
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}
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SerializedData answerIs = new SerializedData(answerData);
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int constructor = answerIs.readInt32();
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TLRPC.TL_server_DH_inner_data dhInnerData = (TLRPC.TL_server_DH_inner_data)TLClassStore.Instance().TLdeserialize(answerIs, constructor);
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if (!(dhInnerData instanceof TLRPC.TL_server_DH_inner_data)) {
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FileLog.e("tmessages", "***** Couldn't parse decoded DH params");
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beginHandshake(false);
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return;
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}
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if (!Arrays.equals(authNonce, dhInnerData.nonce)) {
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FileLog.e("tmessages", "***** Invalid DH nonce");
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beginHandshake(false);
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return;
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}
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if (!Arrays.equals(authServerNonce, dhInnerData.server_nonce)) {
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FileLog.e("tmessages", "***** Invalid DH server nonce");
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beginHandshake(false);
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return;
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}
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byte[] b = new byte[256];
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for (int a = 0; a < 256; a++) {
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b[a] = (byte)(MessagesController.random.nextDouble() * 255);
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}
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BigInteger i_g_b = BigInteger.valueOf(dhInnerData.g);
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i_g_b = i_g_b.modPow(new BigInteger(1, b), new BigInteger(1, dhInnerData.dh_prime));
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byte[] g_b = i_g_b.toByteArray();
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BigInteger i_authKey = new BigInteger(1, dhInnerData.g_a);
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i_authKey = i_authKey.modPow(new BigInteger(1, b), new BigInteger(1, dhInnerData.dh_prime));
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authKey = i_authKey.toByteArray();
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if (authKey.length > 256) {
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byte[] correctedAuth = new byte[256];
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System.arraycopy(authKey, 1, correctedAuth, 0, 256);
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authKey = correctedAuth;
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} else if (authKey.length < 256) {
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byte[] correctedAuth = new byte[256];
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System.arraycopy(authKey, 0, correctedAuth, 256 - authKey.length, authKey.length);
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for (int a = 0; a < 256 - authKey.length; a++) {
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authKey[a] = 0;
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}
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authKey = correctedAuth;
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}
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byte[] authKeyHash = Utilities.computeSHA1(authKey);
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authKeyId = new byte[8];
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System.arraycopy(authKeyHash, authKeyHash.length - 8, authKeyId, 0, 8);
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SerializedData serverSaltData = new SerializedData();
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for (int i = 7; i >= 0; i--) {
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byte a_ = authNewNonce[i];
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byte b_ = authServerNonce[i];
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byte x = (byte)(a_ ^ b_);
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serverSaltData.writeByte(x);
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}
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ByteBuffer saltBuffer = ByteBuffer.wrap(serverSaltData.toByteArray());
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timeDifference = dhInnerData.server_time - (int)(System.currentTimeMillis() / 1000);
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serverSalt = new ServerSalt();
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serverSalt.validSince = (int)(System.currentTimeMillis() / 1000) + timeDifference;
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serverSalt.validUntil = (int)(System.currentTimeMillis() / 1000) + timeDifference + 30 * 60;
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serverSalt.value = saltBuffer.getLong();
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FileLog.d("tmessages", String.format(Locale.US, "===== Time difference: %d", timeDifference));
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TLRPC.TL_client_DH_inner_data clientInnerData = new TLRPC.TL_client_DH_inner_data();
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clientInnerData.nonce = authNonce;
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clientInnerData.server_nonce = authServerNonce;
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clientInnerData.g_b = g_b;
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clientInnerData.retry_id = 0;
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SerializedData os = new SerializedData();
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clientInnerData.serializeToStream(os);
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byte[] clientInnerDataBytes = os.toByteArray();
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SerializedData clientDataWithHash = new SerializedData();
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clientDataWithHash.writeRaw(Utilities.computeSHA1(clientInnerDataBytes));
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clientDataWithHash.writeRaw(clientInnerDataBytes);
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byte[] bb = new byte[1];
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while (clientDataWithHash.length() % 16 != 0) {
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MessagesController.random.nextBytes(bb);
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clientDataWithHash.writeByte(bb[0]);
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}
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TLRPC.TL_set_client_DH_params setClientDhParams = new TLRPC.TL_set_client_DH_params();
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setClientDhParams.nonce = authNonce;
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setClientDhParams.server_nonce = authServerNonce;
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setClientDhParams.encrypted_data = Utilities.aesIgeEncryption(clientDataWithHash.toByteArray(), tmpAesKey.toByteArray(), tmpAesIv.toByteArray(), true, false);
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TLRPC.TL_msgs_ack msgsAck = new TLRPC.TL_msgs_ack();
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msgsAck.msg_ids = new ArrayList<Long>();
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msgsAck.msg_ids.add(messageId);
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sendMessageData(msgsAck, generateMessageId());
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reqDHMsgData = null;
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setClientDHParamsMsgData = sendMessageData(setClientDhParams, generateMessageId());
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} else {
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FileLog.e("tmessages", "***** Couldn't set DH params");
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beginHandshake(false);
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}
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} else if (message instanceof TLRPC.Set_client_DH_params_answer) {
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TLRPC.Set_client_DH_params_answer dhAnswer = (TLRPC.Set_client_DH_params_answer)message;
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if (!Arrays.equals(authNonce, dhAnswer.nonce)) {
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FileLog.e("tmessages", "***** Invalid DH answer nonce");
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beginHandshake(false);
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return;
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}
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if (!Arrays.equals(authServerNonce, dhAnswer.server_nonce)) {
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FileLog.e("tmessages", "***** Invalid DH answer server nonce");
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beginHandshake(false);
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return;
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}
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reqDHMsgData = null;
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TLRPC.TL_msgs_ack msgsAck = new TLRPC.TL_msgs_ack();
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msgsAck.msg_ids = new ArrayList<Long>();
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msgsAck.msg_ids.add(messageId);
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sendMessageData(msgsAck, generateMessageId());
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byte[] authKeyAuxHashFull = Utilities.computeSHA1(authKey);
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byte[] authKeyAuxHash = new byte[8];
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System.arraycopy(authKeyAuxHashFull, 0, authKeyAuxHash, 0, 8);
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SerializedData newNonce1 = new SerializedData();
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newNonce1.writeRaw(authNewNonce);
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newNonce1.writeByte(1);
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newNonce1.writeRaw(authKeyAuxHash);
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byte[] newNonceHash1Full = Utilities.computeSHA1(newNonce1.toByteArray());
|
|
byte[] newNonceHash1 = new byte[16];
|
|
System.arraycopy(newNonceHash1Full, newNonceHash1Full.length - 16, newNonceHash1, 0, 16);
|
|
|
|
SerializedData newNonce2 = new SerializedData();
|
|
newNonce2.writeRaw(authNewNonce);
|
|
newNonce2.writeByte(2);
|
|
newNonce2.writeRaw(authKeyAuxHash);
|
|
byte[] newNonceHash2Full = Utilities.computeSHA1(newNonce2.toByteArray());
|
|
byte[] newNonceHash2 = new byte[16];
|
|
System.arraycopy(newNonceHash2Full, newNonceHash2Full.length - 16, newNonceHash2, 0, 16);
|
|
|
|
SerializedData newNonce3 = new SerializedData();
|
|
newNonce3.writeRaw(authNewNonce);
|
|
newNonce3.writeByte(3);
|
|
newNonce3.writeRaw(authKeyAuxHash);
|
|
byte[] newNonceHash3Full = Utilities.computeSHA1(newNonce3.toByteArray());
|
|
byte[] newNonceHash3 = new byte[16];
|
|
System.arraycopy(newNonceHash3Full, newNonceHash3Full.length - 16, newNonceHash3, 0, 16);
|
|
|
|
if (message instanceof TLRPC.TL_dh_gen_ok) {
|
|
TLRPC.TL_dh_gen_ok dhGenOk = (TLRPC.TL_dh_gen_ok)message;
|
|
if (!Arrays.equals(newNonceHash1, dhGenOk.new_nonce_hash1)) {
|
|
FileLog.e("tmessages", "***** Invalid DH answer nonce hash 1");
|
|
beginHandshake(false);
|
|
return;
|
|
}
|
|
|
|
FileLog.d("tmessages", String.format("Handshake with DC%d completed", datacenter.datacenterId));
|
|
datacenter.connection.delegate = null;
|
|
|
|
final Action parent = this;
|
|
Utilities.stageQueue.postRunnable(new Runnable() {
|
|
@Override
|
|
public void run() {
|
|
datacenter.authKey = authKey;
|
|
datacenter.authKeyId = authKeyId;
|
|
datacenter.addServerSalt(serverSalt);
|
|
HashMap<String, Object> resultDict = new HashMap<String, Object>();
|
|
resultDict.put("timeDifference", timeDifference);
|
|
if (delegate != null) {
|
|
delegate.ActionDidFinishExecution(parent, resultDict);
|
|
}
|
|
}
|
|
});
|
|
} else if (message instanceof TLRPC.TL_dh_gen_retry) {
|
|
TLRPC.TL_dh_gen_retry dhRetry = (TLRPC.TL_dh_gen_retry)message;
|
|
if (!Arrays.equals(newNonceHash2, dhRetry.new_nonce_hash2)) {
|
|
FileLog.e("tmessages", "***** Invalid DH answer nonce hash 2");
|
|
beginHandshake(false);
|
|
return;
|
|
}
|
|
FileLog.d("tmessages", "***** Retry DH");
|
|
beginHandshake(false);
|
|
} else if (message instanceof TLRPC.TL_dh_gen_fail) {
|
|
TLRPC.TL_dh_gen_fail dhFail = (TLRPC.TL_dh_gen_fail)message;
|
|
if (!Arrays.equals(newNonceHash3, dhFail.new_nonce_hash3)) {
|
|
FileLog.e("tmessages", "***** Invalid DH answer nonce hash 3");
|
|
beginHandshake(false);
|
|
return;
|
|
}
|
|
FileLog.d("tmessages", "***** Server declined DH params");
|
|
beginHandshake(false);
|
|
} else {
|
|
FileLog.e("tmessages", "***** Unknown DH params response");
|
|
beginHandshake(false);
|
|
}
|
|
} else {
|
|
TLRPC.TL_msgs_ack msgsAck = new TLRPC.TL_msgs_ack();
|
|
msgsAck.msg_ids = new ArrayList<Long>();
|
|
msgsAck.msg_ids.add(messageId);
|
|
sendMessageData(msgsAck, generateMessageId());
|
|
}
|
|
}
|
|
|
|
@Override
|
|
public void tcpConnectionProgressChanged(TcpConnection connection, long messageId, int currentSize, int length) {
|
|
|
|
}
|
|
|
|
@Override
|
|
public void tcpConnectionClosed(TcpConnection connection) {
|
|
wasDisconnect = true;
|
|
}
|
|
|
|
@Override
|
|
public void tcpConnectionConnected(TcpConnection connection) {
|
|
if (!wasDisconnect) {
|
|
return;
|
|
}
|
|
if (reqPQMsgData != null) {
|
|
datacenter.connection.sendData(reqPQMsgData, false, false);
|
|
} else if (reqDHMsgData != null) {
|
|
datacenter.connection.sendData(reqDHMsgData, false, false);
|
|
} else if (setClientDHParamsMsgData != null) {
|
|
datacenter.connection.sendData(setClientDHParamsMsgData, false, false);
|
|
}
|
|
}
|
|
|
|
@Override
|
|
public void tcpConnectionQuiackAckReceived(TcpConnection connection, int ack) {
|
|
|
|
}
|
|
|
|
@Override
|
|
public void tcpConnectionReceivedData(TcpConnection connection, byte[] data) {
|
|
SerializedData is = new SerializedData(data);
|
|
|
|
long keyId = is.readInt64();
|
|
|
|
if (keyId == 0) {
|
|
long messageId = is.readInt64();
|
|
if (processedMessageIds.contains(messageId)) {
|
|
FileLog.d("tmessages", String.format("===== Duplicate message id %d received, ignoring", messageId));
|
|
return;
|
|
}
|
|
int messageLength = is.readInt32();
|
|
|
|
int constructor = is.readInt32();
|
|
TLObject object = TLClassStore.Instance().TLdeserialize(is, constructor);
|
|
|
|
if (object != null) {
|
|
processedMessageIds.add(messageId);
|
|
}
|
|
processMessage(object, messageId);
|
|
} else {
|
|
FileLog.d("tmessages", "***** Received encrypted message while in handshake, restarting");
|
|
beginHandshake(true);
|
|
}
|
|
}
|
|
}
|