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Nagram/TMessagesProj/src/main/java/org/telegram/messenger/HandshakeAction.java

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first commit
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/*
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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.
* You should have received a copy of the license in this archive (see LICENSE).
*
* Copyright Nikolai Kudashov, 2013.
*/
package org.telegram.messenger;
import org.telegram.TL.TLClassStore;
import org.telegram.TL.TLObject;
import org.telegram.TL.TLRPC;
import java.math.BigInteger;
import java.nio.ByteBuffer;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.HashMap;
import java.util.Locale;
public class HandshakeAction extends Action implements TcpConnection.TcpConnectionDelegate {
private ArrayList<Long> processedMessageIds;
private byte[] authNonce;
private byte[] authServerNonce;
private byte[] authNewNonce;
private byte[] authKey;
private byte[] authKeyId;
private boolean processedPQRes;
private byte[] reqPQMsgData;
private byte[] reqDHMsgData;
private byte[] setClientDHParamsMsgData;
private boolean wasDisconnect = false;
private long lastOutgoingMessageId;
int timeDifference;
ServerSalt serverSalt;
public Datacenter datacenter;
public HandshakeAction(Datacenter datacenter) {
this.datacenter = datacenter;
}
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);
}
void beginHandshake(boolean dropConnection) {
if (datacenter.connection == null) {
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datacenter.connection = new TcpConnection(datacenter.datacenterId);
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datacenter.connection.delegate = this;
datacenter.connection.transportRequestClass = RPCRequest.RPCRequestClassGeneric;
}
processedMessageIds = new ArrayList<Long>();
authNonce = null;
authServerNonce = null;
authNewNonce = null;
authKey = null;
authKeyId = null;
processedPQRes = false;
reqPQMsgData = null;
reqDHMsgData = null;
setClientDHParamsMsgData = null;
if (dropConnection) {
datacenter.connection.suspendConnection(true);
datacenter.connection.connect();
}
TLRPC.TL_req_pq reqPq = new TLRPC.TL_req_pq();
byte[] nonceBytes = new byte[16];
for (int a = 0; a < 16; a++) {
nonceBytes[a] = (byte)(MessagesController.random.nextDouble() * 255);
}
authNonce = reqPq.nonce = nonceBytes;
reqPQMsgData = sendMessageData(reqPq, generateMessageId());
}
final Integer lock = 1;
static ArrayList<HashMap<String, Object>> serverPublicKeys = null;
HashMap<String, Object> selectPublicKey(ArrayList<Long> fingerprints) {
synchronized (lock) {
if (serverPublicKeys == null) {
serverPublicKeys = new ArrayList<HashMap<String, Object>>();
HashMap<String, Object> map;
map = new HashMap<String, Object>();
map.put("key", new BigInteger[]{
new BigInteger("c150023e2f70db7985ded064759cfecf0af328e69a41daf4d6f01b538135" +
"a6f91f8f8b2a0ec9ba9720ce352efcf6c5680ffc424bd634864902de0b4bd6d49f4e580230e" +
"3ae97d95c8b19442b3c0a10d8f5633fecedd6926a7f6dab0ddb7d457f9ea81b8465fcd6fffe" +
"ed114011df91c059caedaf97625f6c96ecc74725556934ef781d866b34f011fce4d835a0901" +
"96e9a5f0e4449af7eb697ddb9076494ca5f81104a305b6dd27665722c46b60e5df680fb16b2" +
"10607ef217652e60236c255f6a28315f4083a96791d7214bf64c1df4fd0db1944fb26a2a570" +
"31b32eee64ad15a8ba68885cde74a5bfc920f6abf59ba5c75506373e7130f9042da922179251f", 16),
new BigInteger("010001", 16)});
map.put("fingerprint", 0xc3b42b026ce86b21L);
serverPublicKeys.add(map);
}
}
for (HashMap<String, Object> keyDesc : serverPublicKeys) {
long keyFingerprint = (Long)keyDesc.get("fingerprint");
for (long nFingerprint : fingerprints) {
if (nFingerprint == keyFingerprint) {
return keyDesc;
}
}
}
return null;
}
long generateMessageId() {
long messageId = (long)((((double)System.currentTimeMillis()) * 4294967296.0) / 1000.0);
if (messageId <= lastOutgoingMessageId) {
messageId = lastOutgoingMessageId + 1;
}
while (messageId % 4 != 0) {
messageId++;
}
lastOutgoingMessageId = messageId;
return messageId;
}
byte[] sendMessageData(TLObject message, long messageId) {
byte[] messageData;
SerializedData innerOs = new SerializedData();
message.serializeToStream(innerOs);
messageData = innerOs.toByteArray();
SerializedData messageOs = new SerializedData();
messageOs.writeInt64(0);
messageOs.writeInt64(messageId);
messageOs.writeInt32(messageData.length);
messageOs.writeRaw(messageData);
byte[] transportData = messageOs.toByteArray();
datacenter.connection.sendData(transportData, false, false);
return transportData;
}
void processMessage(TLObject message, long messageId) {
if (message instanceof TLRPC.TL_resPQ) {
if (processedPQRes) {
TLRPC.TL_msgs_ack msgsAck = new TLRPC.TL_msgs_ack();
msgsAck.msg_ids = new ArrayList<Long>();
msgsAck.msg_ids.add(messageId);
sendMessageData(msgsAck, generateMessageId());
return;
}
processedPQRes = true;
final TLRPC.TL_resPQ resPq = (TLRPC.TL_resPQ)message;
if (Arrays.equals(authNonce, resPq.nonce)) {
final HashMap<String, Object> publicKey = selectPublicKey(resPq.server_public_key_fingerprints);
if (publicKey == null) {
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FileLog.e("tmessages", "***** Couldn't find valid server public key");
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beginHandshake(false);
return;
}
authServerNonce = resPq.server_nonce;
ByteBuffer data = ByteBuffer.wrap(resPq.pq);
final long pqf = data.getLong();
final long messageIdf = messageId;
Utilities.globalQueue.postRunnable(new Runnable() {
@Override
public void run() {
final Utilities.TPFactorizedValue factorizedPq = Utilities.getFactorizedValue(pqf);
Utilities.stageQueue.postRunnable(new Runnable() {
@Override
public void run() {
ByteBuffer pBytes = ByteBuffer.allocate(4);
pBytes.putInt((int)factorizedPq.p);
byte[] pData = pBytes.array();
ByteBuffer qBytes = ByteBuffer.allocate(4);
qBytes.putInt((int)factorizedPq.q);
byte[] qData = qBytes.array();
TLRPC.TL_req_DH_params reqDH = new TLRPC.TL_req_DH_params();
reqDH.nonce = authNonce;
reqDH.server_nonce = authServerNonce;
reqDH.p = pData;
reqDH.q = qData;
reqDH.public_key_fingerprint = (Long)publicKey.get("fingerprint");
SerializedData os = new SerializedData();
TLRPC.TL_p_q_inner_data innerData = new TLRPC.TL_p_q_inner_data();
innerData.nonce = authNonce;
innerData.server_nonce = authServerNonce;
innerData.pq = resPq.pq;
innerData.p = reqDH.p;
innerData.q = reqDH.q;
byte[] nonceBytes = new byte[32];
for (int a = 0; a < 32; a++) {
nonceBytes[a] = (byte)(MessagesController.random.nextDouble() * 255);
}
innerData.new_nonce = authNewNonce = nonceBytes;
innerData.serializeToStream(os);
byte[] innerDataBytes = os.toByteArray();
SerializedData dataWithHash = new SerializedData();
dataWithHash.writeRaw(Utilities.computeSHA1(innerDataBytes));
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);
dataWithHash.writeByte(b[0]);
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}
byte[] encryptedBytes = Utilities.encryptWithRSA((BigInteger[])publicKey.get("key"), dataWithHash.toByteArray());
SerializedData encryptedData = new SerializedData();
encryptedData.writeRaw(encryptedBytes);
if (encryptedData.length() < 256) {
SerializedData newEncryptedData = new SerializedData();
for (int i = 0; i < 256 - encryptedData.length(); i++) {
newEncryptedData.writeByte(0);
}
newEncryptedData.writeRaw(encryptedData.toByteArray());
encryptedData = newEncryptedData;
}
reqDH.encrypted_data = encryptedData.toByteArray();
TLRPC.TL_msgs_ack msgsAck = new TLRPC.TL_msgs_ack();
msgsAck.msg_ids = new ArrayList<Long>();
msgsAck.msg_ids.add(messageIdf);
sendMessageData(msgsAck, generateMessageId());
reqPQMsgData = null;
reqDHMsgData = sendMessageData(reqDH, generateMessageId());
}
});
}
});
} else {
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FileLog.e("tmessages", "***** Error: invalid handshake nonce");
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beginHandshake(false);
}
} else if (message instanceof TLRPC.Server_DH_Params) {
if (message instanceof TLRPC.TL_server_DH_params_ok) {
TLRPC.TL_server_DH_params_ok serverDhParams = (TLRPC.TL_server_DH_params_ok)message;
SerializedData tmpAesKey = new SerializedData();
SerializedData newNonceAndServerNonce = new SerializedData();
newNonceAndServerNonce.writeRaw(authNewNonce);
newNonceAndServerNonce.writeRaw(authServerNonce);
SerializedData serverNonceAndNewNonce = new SerializedData();
serverNonceAndNewNonce.writeRaw(authServerNonce);
serverNonceAndNewNonce.writeRaw(authNewNonce);
tmpAesKey.writeRaw(Utilities.computeSHA1(newNonceAndServerNonce.toByteArray()));
byte[] serverNonceAndNewNonceHash = Utilities.computeSHA1(serverNonceAndNewNonce.toByteArray());
byte[] serverNonceAndNewNonceHash0_12 = new byte[12];
System.arraycopy(serverNonceAndNewNonceHash, 0, serverNonceAndNewNonceHash0_12, 0, 12);
tmpAesKey.writeRaw(serverNonceAndNewNonceHash0_12);
SerializedData tmpAesIv = new SerializedData();
byte[] serverNonceAndNewNonceHash12_8 = new byte[8];
System.arraycopy(serverNonceAndNewNonceHash, 12, serverNonceAndNewNonceHash12_8, 0, 8);
tmpAesIv.writeRaw(serverNonceAndNewNonceHash12_8);
SerializedData newNonceAndNewNonce = new SerializedData();
newNonceAndNewNonce.writeRaw(authNewNonce);
newNonceAndNewNonce.writeRaw(authNewNonce);
tmpAesIv.writeRaw(Utilities.computeSHA1(newNonceAndNewNonce.toByteArray()));
byte[] newNonce0_4 = new byte[4];
System.arraycopy(authNewNonce, 0, newNonce0_4, 0, 4);
tmpAesIv.writeRaw(newNonce0_4);
byte[] answerWithHash = Utilities.aesIgeEncryption(serverDhParams.encrypted_answer, tmpAesKey.toByteArray(), tmpAesIv.toByteArray(), false, false);
byte[] answerHash = new byte[20];
System.arraycopy(answerWithHash, 0, answerHash, 0, 20);
byte[] answerData = new byte[answerWithHash.length - 20];
System.arraycopy(answerWithHash, 20, answerData, 0, answerWithHash.length - 20);
boolean hashVerified = false;
for (int i = 0; i < 16; i++) {
byte[] computedAnswerHash = Utilities.computeSHA1(answerData);
if (Arrays.equals(computedAnswerHash, answerHash)) {
hashVerified = true;
break;
}
byte[] answerData2 = new byte[answerData.length - 1];
System.arraycopy(answerData, 0, answerData2, 0, answerData.length - 1);
answerData = answerData2;
}
if (!hashVerified) {
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FileLog.e("tmessages", "***** Couldn't decode DH params");
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beginHandshake(false);
return;
}
SerializedData answerIs = new SerializedData(answerData);
int constructor = answerIs.readInt32();
TLRPC.TL_server_DH_inner_data dhInnerData = (TLRPC.TL_server_DH_inner_data)TLClassStore.Instance().TLdeserialize(answerIs, constructor);
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);
return;
}
if (!Arrays.equals(authNonce, dhInnerData.nonce)) {
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FileLog.e("tmessages", "***** Invalid DH nonce");
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beginHandshake(false);
return;
}
if (!Arrays.equals(authServerNonce, dhInnerData.server_nonce)) {
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FileLog.e("tmessages", "***** Invalid DH server nonce");
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beginHandshake(false);
return;
}
byte[] b = new byte[256];
for (int a = 0; a < 256; a++) {
b[a] = (byte)(MessagesController.random.nextDouble() * 255);
}
BigInteger i_g_b = BigInteger.valueOf(dhInnerData.g);
i_g_b = i_g_b.modPow(new BigInteger(1, b), new BigInteger(1, dhInnerData.dh_prime));
byte[] g_b = i_g_b.toByteArray();
BigInteger i_authKey = new BigInteger(1, dhInnerData.g_a);
i_authKey = i_authKey.modPow(new BigInteger(1, b), new BigInteger(1, dhInnerData.dh_prime));
authKey = i_authKey.toByteArray();
if (authKey.length > 256) {
byte[] correctedAuth = new byte[256];
System.arraycopy(authKey, 1, correctedAuth, 0, 256);
authKey = correctedAuth;
} else if (authKey.length < 256) {
byte[] correctedAuth = new byte[256];
System.arraycopy(authKey, 0, correctedAuth, 256 - authKey.length, authKey.length);
for (int a = 0; a < 256 - authKey.length; a++) {
authKey[a] = 0;
}
authKey = correctedAuth;
}
byte[] authKeyHash = Utilities.computeSHA1(authKey);
authKeyId = new byte[8];
System.arraycopy(authKeyHash, authKeyHash.length - 8, authKeyId, 0, 8);
SerializedData serverSaltData = new SerializedData();
for (int i = 7; i >= 0; i--) {
byte a_ = authNewNonce[i];
byte b_ = authServerNonce[i];
byte x = (byte)(a_ ^ b_);
serverSaltData.writeByte(x);
}
ByteBuffer saltBuffer = ByteBuffer.wrap(serverSaltData.toByteArray());
timeDifference = dhInnerData.server_time - (int)(System.currentTimeMillis() / 1000);
serverSalt = new ServerSalt();
serverSalt.validSince = (int)(System.currentTimeMillis() / 1000) + timeDifference;
serverSalt.validUntil = (int)(System.currentTimeMillis() / 1000) + timeDifference + 30 * 60;
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();
clientInnerData.nonce = authNonce;
clientInnerData.server_nonce = authServerNonce;
clientInnerData.g_b = g_b;
clientInnerData.retry_id = 0;
SerializedData os = new SerializedData();
clientInnerData.serializeToStream(os);
byte[] clientInnerDataBytes = os.toByteArray();
SerializedData clientDataWithHash = new SerializedData();
clientDataWithHash.writeRaw(Utilities.computeSHA1(clientInnerDataBytes));
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);
clientDataWithHash.writeByte(bb[0]);
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}
TLRPC.TL_set_client_DH_params setClientDhParams = new TLRPC.TL_set_client_DH_params();
setClientDhParams.nonce = authNonce;
setClientDhParams.server_nonce = authServerNonce;
setClientDhParams.encrypted_data = Utilities.aesIgeEncryption(clientDataWithHash.toByteArray(), tmpAesKey.toByteArray(), tmpAesIv.toByteArray(), true, false);
TLRPC.TL_msgs_ack msgsAck = new TLRPC.TL_msgs_ack();
msgsAck.msg_ids = new ArrayList<Long>();
msgsAck.msg_ids.add(messageId);
sendMessageData(msgsAck, generateMessageId());
reqDHMsgData = null;
setClientDHParamsMsgData = sendMessageData(setClientDhParams, generateMessageId());
} else {
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FileLog.e("tmessages", "***** Couldn't set DH params");
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beginHandshake(false);
}
} else if (message instanceof TLRPC.Set_client_DH_params_answer) {
TLRPC.Set_client_DH_params_answer dhAnswer = (TLRPC.Set_client_DH_params_answer)message;
if (!Arrays.equals(authNonce, dhAnswer.nonce)) {
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FileLog.e("tmessages", "***** Invalid DH answer nonce");
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beginHandshake(false);
return;
}
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);
return;
}
reqDHMsgData = null;
TLRPC.TL_msgs_ack msgsAck = new TLRPC.TL_msgs_ack();
msgsAck.msg_ids = new ArrayList<Long>();
msgsAck.msg_ids.add(messageId);
sendMessageData(msgsAck, generateMessageId());
byte[] authKeyAuxHashFull = Utilities.computeSHA1(authKey);
byte[] authKeyAuxHash = new byte[8];
System.arraycopy(authKeyAuxHashFull, 0, authKeyAuxHash, 0, 8);
SerializedData newNonce1 = new SerializedData();
newNonce1.writeRaw(authNewNonce);
newNonce1.writeByte(1);
newNonce1.writeRaw(authKeyAuxHash);
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)) {
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FileLog.e("tmessages", "***** Invalid DH answer nonce hash 1");
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beginHandshake(false);
return;
}
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FileLog.d("tmessages", String.format("Handshake with DC%d completed", datacenter.datacenterId));
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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)) {
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FileLog.e("tmessages", "***** Invalid DH answer nonce hash 2");
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beginHandshake(false);
return;
}
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FileLog.d("tmessages", "***** Retry DH");
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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)) {
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FileLog.e("tmessages", "***** Invalid DH answer nonce hash 3");
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beginHandshake(false);
return;
}
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FileLog.d("tmessages", "***** Server declined DH params");
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beginHandshake(false);
} else {
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FileLog.e("tmessages", "***** Unknown DH params response");
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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());
}
}
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@Override
public void tcpConnectionProgressChanged(TcpConnection connection, long messageId, int currentSize, int length) {
}
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@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)) {
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FileLog.d("tmessages", String.format("===== Duplicate message id %d received, ignoring", messageId));
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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 {
update to 1.3.2
2013-12-20 19:25:49 +00:00
FileLog.d("tmessages", "***** Received encrypted message while in handshake, restarting");
first commit
2013-10-25 15:19:00 +00:00
beginHandshake(true);
}
}
}
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