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Telegram-Android/TMessagesProj/jni/tgnet/Handshake.cpp
xaxtix abb896635f update to 9.0.0
2022-09-16 22:48:21 +04:00

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/*
* This is the source code of tgnet library v. 1.1
* 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, 2015-2018.
*/
#include <stdlib.h>
#include <algorithm>
#include <memory>
#include <openssl/rand.h>
#include <openssl/sha.h>
#include <openssl/bn.h>
#include <openssl/pem.h>
#include <openssl/aes.h>
#include <memory.h>
#include "Handshake.h"
#include "FileLog.h"
#include "Datacenter.h"
#include "ConnectionsManager.h"
#include "MTProtoScheme.h"
#include "ApiScheme.h"
#include "BuffersStorage.h"
#include "NativeByteBuffer.h"
#include "Config.h"
#include "Connection.h"
thread_local static std::vector<std::string> serverPublicKeys;
thread_local static std::vector<uint64_t> serverPublicKeysFingerprints;
thread_local static std::map<int32_t, std::string> cdnPublicKeys;
thread_local static std::map<int32_t, uint64_t> cdnPublicKeysFingerprints;
thread_local static std::vector<Datacenter *> cdnWaitingDatacenters;
thread_local static bool loadingCdnKeys = false;
thread_local static BN_CTX *bnContext = nullptr;
thread_local static Config *cdnConfig = nullptr;
Handshake::Handshake(Datacenter *datacenter, HandshakeType type, HandshakeDelegate *handshakeDelegate) {
currentDatacenter = datacenter;
handshakeType = type;
delegate = handshakeDelegate;
}
Handshake::~Handshake() {
cleanupHandshake();
}
void Handshake::beginHandshake(bool reconnect) {
if (LOGS_ENABLED) DEBUG_D("account%u dc%u handshake: begin, type = %d", currentDatacenter->instanceNum, currentDatacenter->datacenterId, handshakeType);
cleanupHandshake();
Connection *connection = getConnection();
handshakeState = 1;
if (reconnect) {
connection->suspendConnection();
connection->connect();
}
auto request = new TL_req_pq_multi();
request->nonce = std::make_unique<ByteArray>(16);
RAND_bytes(request->nonce->bytes, 16);
authNonce = new ByteArray(request->nonce.get());
sendRequestData(request, true);
}
void Handshake::cleanupHandshake() {
handshakeState = 0;
if (handshakeRequest != nullptr) {
delete handshakeRequest;
handshakeRequest = nullptr;
}
if (handshakeServerSalt != nullptr) {
delete handshakeServerSalt;
handshakeServerSalt = nullptr;
}
if (authNonce != nullptr) {
delete authNonce;
authNonce = nullptr;
}
if (authServerNonce != nullptr) {
delete authServerNonce;
authServerNonce = nullptr;
}
if (authNewNonce != nullptr) {
delete authNewNonce;
authNewNonce = nullptr;
}
if (handshakeAuthKey != nullptr) {
delete handshakeAuthKey;
handshakeAuthKey = nullptr;
}
if (authKeyTempPending != nullptr) {
delete authKeyTempPending;
authKeyTempPending = nullptr;
}
if (authKeyPendingMessageId != 0 || authKeyPendingRequestId != 0) {
ConnectionsManager::getInstance(currentDatacenter->instanceNum).cancelRequestInternal(authKeyPendingRequestId, authKeyPendingMessageId, false, false);
authKeyPendingMessageId = 0;
authKeyPendingRequestId = 0;
}
authKeyTempPendingId = 0;
}
inline Connection *Handshake::getConnection() {
return handshakeType == HandshakeTypeMediaTemp ? currentDatacenter->createGenericMediaConnection() : currentDatacenter->createGenericConnection();
}
void Handshake::sendRequestData(TLObject *object, bool important) {
uint32_t messageLength = object->getObjectSize();
NativeByteBuffer *buffer = BuffersStorage::getInstance().getFreeBuffer(20 + messageLength);
buffer->writeInt64(0);
buffer->writeInt64(ConnectionsManager::getInstance(currentDatacenter->instanceNum).generateMessageId());
buffer->writeInt32(messageLength);
object->serializeToStream(buffer);
getConnection()->sendData(buffer, false, false);
if (important) {
if (handshakeRequest != object) {
if (handshakeRequest != nullptr) {
delete handshakeRequest;
}
handshakeRequest = object;
}
} else {
delete object;
}
}
inline uint64_t gcd(uint64_t a, uint64_t b) {
while (a != 0 && b != 0) {
while ((b & 1) == 0) {
b >>= 1;
}
while ((a & 1) == 0) {
a >>= 1;
}
if (a > b) {
a -= b;
} else {
b -= a;
}
}
return b == 0 ? a : b;
}
inline bool factorizeValue(uint64_t what, uint32_t &p, uint32_t &q) {
int32_t it = 0, i, j;
uint64_t g = 0;
for (i = 0; i < 3 || it < 1000; i++) {
uint64_t t = ((lrand48() & 15) + 17) % what;
uint64_t x = (long long) lrand48() % (what - 1) + 1, y = x;
int32_t lim = 1 << (i + 18);
for (j = 1; j < lim; j++) {
++it;
uint64_t a = x, b = x, c = t;
while (b) {
if (b & 1) {
c += a;
if (c >= what) {
c -= what;
}
}
a += a;
if (a >= what) {
a -= what;
}
b >>= 1;
}
x = c;
uint64_t z = x < y ? what + x - y : x - y;
g = gcd(z, what);
if (g != 1) {
break;
}
if (!(j & (j - 1))) {
y = x;
}
}
if (g > 1 && g < what) {
break;
}
}
if (g > 1 && g < what) {
p = (uint32_t) g;
q = (uint32_t) (what / g);
if (p > q) {
uint32_t tmp = p;
p = q;
q = tmp;
}
return true;
} else {
if (LOGS_ENABLED) DEBUG_FATAL("factorization failed for %" PRIu64, what);
p = 0;
q = 0;
return false;
}
}
inline bool check_prime(BIGNUM *p) {
int result = 0;
if (!BN_primality_test(&result, p, 64, bnContext, 0, NULL)) {
if (LOGS_ENABLED) DEBUG_FATAL("OpenSSL error at BN_primality_test");
return false;
}
return result != 0;
}
inline bool isGoodPrime(BIGNUM *p, uint32_t g) {
if (g < 2 || g > 7 || BN_num_bits(p) != 2048) {
return false;
}
BIGNUM *t = BN_new();
BIGNUM *dh_g = BN_new();
if (!BN_set_word(dh_g, 4 * g)) {
if (LOGS_ENABLED) DEBUG_FATAL("OpenSSL error at BN_set_word(dh_g, 4 * g)");
BN_free(t);
BN_free(dh_g);
return false;
}
if (!BN_mod(t, p, dh_g, bnContext)) {
if (LOGS_ENABLED) DEBUG_FATAL("OpenSSL error at BN_mod");
BN_free(t);
BN_free(dh_g);
return false;
}
uint64_t x = BN_get_word(t);
if (x >= 4 * g) {
if (LOGS_ENABLED) DEBUG_FATAL("OpenSSL error at BN_get_word");
BN_free(t);
BN_free(dh_g);
return false;
}
BN_free(dh_g);
bool result = true;
switch (g) {
case 2:
if (x != 7) {
result = false;
}
break;
case 3:
if (x % 3 != 2) {
result = false;
}
break;
case 5:
if (x % 5 != 1 && x % 5 != 4) {
result = false;
}
break;
case 6:
if (x != 19 && x != 23) {
result = false;
}
break;
case 7:
if (x % 7 != 3 && x % 7 != 5 && x % 7 != 6) {
result = false;
}
break;
default:
break;
}
char *prime = BN_bn2hex(p);
static const char *goodPrime = "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";
if (!strcasecmp(prime, goodPrime)) {
OPENSSL_free(prime);
BN_free(t);
return true;
}
OPENSSL_free(prime);
if (!result || !check_prime(p)) {
BN_free(t);
return false;
}
BIGNUM *b = BN_new();
if (!BN_set_word(b, 2)) {
if (LOGS_ENABLED) DEBUG_E("OpenSSL error at BN_set_word(b, 2)");
BN_free(b);
BN_free(t);
return false;
}
if (!BN_div(t, 0, p, b, bnContext)) {
if (LOGS_ENABLED) DEBUG_E("OpenSSL error at BN_div");
BN_free(b);
BN_free(t);
return false;
}
if (!check_prime(t)) {
result = false;
}
BN_free(b);
BN_free(t);
return result;
}
inline bool isGoodGaAndGb(BIGNUM *g_a, BIGNUM *p) {
if (BN_num_bytes(g_a) > 256 || BN_num_bits(g_a) < 2048 - 64 || BN_cmp(p, g_a) <= 0) {
return false;
}
BIGNUM *dif = BN_new();
BN_sub(dif, p, g_a);
if (BN_num_bits(dif) < 2048 - 64) {
BN_free(dif);
return false;
}
BN_free(dif);
return true;
}
void Handshake::cleanupServerKeys() {
serverPublicKeys.clear();
serverPublicKeysFingerprints.clear();
}
void Handshake::processHandshakeResponse(TLObject *message, int64_t messageId) {
if (handshakeState == 0) {
return;
}
const std::type_info &typeInfo = typeid(*message);
if (typeInfo == typeid(TL_resPQ)) {
if (handshakeState != 1) {
sendAckRequest(messageId);
return;
}
handshakeState = 2;
auto result = (TL_resPQ *) message;
if (authNonce->isEqualTo(result->nonce.get())) {
std::string key = "";
int64_t keyFingerprint = 0;
size_t count1 = result->server_public_key_fingerprints.size();
if (currentDatacenter->isCdnDatacenter) {
auto iter = cdnPublicKeysFingerprints.find(currentDatacenter->datacenterId);
if (iter != cdnPublicKeysFingerprints.end()) {
for (uint32_t a = 0; a < count1; a++) {
if ((uint64_t) result->server_public_key_fingerprints[a] == iter->second) {
keyFingerprint = iter->second;
key = cdnPublicKeys[currentDatacenter->datacenterId];
}
}
}
} else {
if (serverPublicKeys.empty()) {
if (ConnectionsManager::getInstance(currentDatacenter->instanceNum).testBackend) {
serverPublicKeys.emplace_back("-----BEGIN RSA PUBLIC KEY-----\n"
"MIIBCgKCAQEAyMEdY1aR+sCR3ZSJrtztKTKqigvO/vBfqACJLZtS7QMgCGXJ6XIR\n"
"yy7mx66W0/sOFa7/1mAZtEoIokDP3ShoqF4fVNb6XeqgQfaUHd8wJpDWHcR2OFwv\n"
"plUUI1PLTktZ9uW2WE23b+ixNwJjJGwBDJPQEQFBE+vfmH0JP503wr5INS1poWg/\n"
"j25sIWeYPHYeOrFp/eXaqhISP6G+q2IeTaWTXpwZj4LzXq5YOpk4bYEQ6mvRq7D1\n"
"aHWfYmlEGepfaYR8Q0YqvvhYtMte3ITnuSJs171+GDqpdKcSwHnd6FudwGO4pcCO\n"
"j4WcDuXc2CTHgH8gFTNhp/Y8/SpDOhvn9QIDAQAB\n"
"-----END RSA PUBLIC KEY-----");
serverPublicKeysFingerprints.push_back(0xb25898df208d2603);
} else {
serverPublicKeys.emplace_back("-----BEGIN RSA PUBLIC KEY-----\n"
"MIIBCgKCAQEA6LszBcC1LGzyr992NzE0ieY+BSaOW622Aa9Bd4ZHLl+TuFQ4lo4g\n"
"5nKaMBwK/BIb9xUfg0Q29/2mgIR6Zr9krM7HjuIcCzFvDtr+L0GQjae9H0pRB2OO\n"
"62cECs5HKhT5DZ98K33vmWiLowc621dQuwKWSQKjWf50XYFw42h21P2KXUGyp2y/\n"
"+aEyZ+uVgLLQbRA1dEjSDZ2iGRy12Mk5gpYc397aYp438fsJoHIgJ2lgMv5h7WY9\n"
"t6N/byY9Nw9p21Og3AoXSL2q/2IJ1WRUhebgAdGVMlV1fkuOQoEzR7EdpqtQD9Cs\n"
"5+bfo3Nhmcyvk5ftB0WkJ9z6bNZ7yxrP8wIDAQAB\n"
"-----END RSA PUBLIC KEY-----");
serverPublicKeysFingerprints.push_back(0xd09d1d85de64fd85);
}
}
size_t count2 = serverPublicKeysFingerprints.size();
for (uint32_t a = 0; a < count1; a++) {
for (uint32_t b = 0; b < count2; b++) {
if ((uint64_t) result->server_public_key_fingerprints[a] == serverPublicKeysFingerprints[b]) {
keyFingerprint = result->server_public_key_fingerprints[a];
key = serverPublicKeys[b];
break;
}
}
if (keyFingerprint != 0) {
break;
}
}
}
if (keyFingerprint == 0) {
if (currentDatacenter->isCdnDatacenter) {
if (LOGS_ENABLED) DEBUG_D("account%u dc%u handshake: can't find valid cdn server public key, type = %d", currentDatacenter->instanceNum, currentDatacenter->datacenterId, handshakeType);
loadCdnConfig(currentDatacenter);
} else {
if (LOGS_ENABLED) DEBUG_E("account%u dc%u handshake: can't find valid server public key, type = %d", currentDatacenter->instanceNum, currentDatacenter->datacenterId, handshakeType);
beginHandshake(false);
}
return;
}
authServerNonce = new ByteArray(result->server_nonce.get());
uint64_t pq = ((uint64_t) (result->pq->bytes[0] & 0xff) << 56) |
((uint64_t) (result->pq->bytes[1] & 0xff) << 48) |
((uint64_t) (result->pq->bytes[2] & 0xff) << 40) |
((uint64_t) (result->pq->bytes[3] & 0xff) << 32) |
((uint64_t) (result->pq->bytes[4] & 0xff) << 24) |
((uint64_t) (result->pq->bytes[5] & 0xff) << 16) |
((uint64_t) (result->pq->bytes[6] & 0xff) << 8) |
((uint64_t) (result->pq->bytes[7] & 0xff));
uint32_t p, q;
if (!factorizeValue(pq, p, q)) {
beginHandshake(false);
return;
}
auto request = new TL_req_DH_params();
request->nonce = std::make_unique<ByteArray>(new ByteArray(authNonce));
request->server_nonce = std::make_unique<ByteArray>(new ByteArray(authServerNonce));
request->p = std::make_unique<ByteArray>(new ByteArray(4));
request->p->bytes[3] = (uint8_t) p;
request->p->bytes[2] = (uint8_t) (p >> 8);
request->p->bytes[1] = (uint8_t) (p >> 16);
request->p->bytes[0] = (uint8_t) (p >> 24);
request->q = std::make_unique<ByteArray>(new ByteArray(4));
request->q->bytes[3] = (uint8_t) q;
request->q->bytes[2] = (uint8_t) (q >> 8);
request->q->bytes[1] = (uint8_t) (q >> 16);
request->q->bytes[0] = (uint8_t) (q >> 24);
request->public_key_fingerprint = keyFingerprint;
TLObject *innerData;
if (handshakeType == HandshakeTypePerm) {
auto tl_p_q_inner_data = new TL_p_q_inner_data_dc();
tl_p_q_inner_data->nonce = std::make_unique<ByteArray>(authNonce);
tl_p_q_inner_data->server_nonce = std::make_unique<ByteArray>(authServerNonce);
tl_p_q_inner_data->pq = std::make_unique<ByteArray>(new ByteArray(result->pq.get()));
tl_p_q_inner_data->p = std::make_unique<ByteArray>(new ByteArray(request->p.get()));
tl_p_q_inner_data->q = std::make_unique<ByteArray>(new ByteArray(request->q.get()));
tl_p_q_inner_data->new_nonce = std::make_unique<ByteArray>(new ByteArray(32));
if (ConnectionsManager::getInstance(currentDatacenter->instanceNum).testBackend) {
tl_p_q_inner_data->dc = 10000 + currentDatacenter->datacenterId;
} else {
tl_p_q_inner_data->dc = currentDatacenter->datacenterId;
}
RAND_bytes(tl_p_q_inner_data->new_nonce->bytes, 32);
authNewNonce = new ByteArray(tl_p_q_inner_data->new_nonce.get());
innerData = tl_p_q_inner_data;
} else {
auto tl_p_q_inner_data_temp = new TL_p_q_inner_data_temp_dc();
tl_p_q_inner_data_temp->nonce = std::make_unique<ByteArray>(new ByteArray(authNonce));
tl_p_q_inner_data_temp->server_nonce = std::make_unique<ByteArray>(new ByteArray(authServerNonce));
tl_p_q_inner_data_temp->pq = std::make_unique<ByteArray>(new ByteArray(result->pq.get()));
tl_p_q_inner_data_temp->p = std::make_unique<ByteArray>(new ByteArray(request->p.get()));
tl_p_q_inner_data_temp->q = std::make_unique<ByteArray>(new ByteArray(request->q.get()));
tl_p_q_inner_data_temp->new_nonce = std::make_unique<ByteArray>(new ByteArray(32));
if (handshakeType == HandshakeTypeMediaTemp) {
if (ConnectionsManager::getInstance(currentDatacenter->instanceNum).testBackend) {
tl_p_q_inner_data_temp->dc = -(10000 + currentDatacenter->datacenterId);
} else {
tl_p_q_inner_data_temp->dc = -currentDatacenter->datacenterId;
}
} else {
if (ConnectionsManager::getInstance(currentDatacenter->instanceNum).testBackend) {
tl_p_q_inner_data_temp->dc = 10000 + currentDatacenter->datacenterId;
} else {
tl_p_q_inner_data_temp->dc = currentDatacenter->datacenterId;
}
}
tl_p_q_inner_data_temp->expires_in = TEMP_AUTH_KEY_EXPIRE_TIME;
RAND_bytes(tl_p_q_inner_data_temp->new_nonce->bytes, 32);
authNewNonce = new ByteArray(tl_p_q_inner_data_temp->new_nonce.get());
innerData = tl_p_q_inner_data_temp;
}
uint32_t innerDataSize = innerData->getObjectSize();
if (innerDataSize > 144) {
if (LOGS_ENABLED) DEBUG_E("account%u dc%u handshake: inner data too large %d, type = %d", currentDatacenter->instanceNum, currentDatacenter->datacenterId, innerDataSize, handshakeType);
delete innerData;
beginHandshake(false);
return;
}
uint32_t keySize = 32;
uint32_t ivSize = 32;
uint32_t paddedDataSize = 192;
uint32_t encryptedDataSize = keySize + paddedDataSize + SHA256_DIGEST_LENGTH;
uint32_t additionalSize = innerDataSize < paddedDataSize ? paddedDataSize - innerDataSize : 0;
NativeByteBuffer *innerDataBuffer = BuffersStorage::getInstance().getFreeBuffer(encryptedDataSize + paddedDataSize + ivSize + SHA256_DIGEST_LENGTH + 256);
innerDataBuffer->position(encryptedDataSize);
innerData->serializeToStream(innerDataBuffer);
delete innerData;
BIO *keyBio = BIO_new(BIO_s_mem());
BIO_write(keyBio, key.c_str(), (int) key.length());
RSA *rsaKey = PEM_read_bio_RSAPublicKey(keyBio, nullptr, nullptr, nullptr);
BIO_free(keyBio);
while (true) {
RAND_bytes(innerDataBuffer->bytes() + encryptedDataSize + innerDataSize, additionalSize);
for (uint32_t i = 0; i < paddedDataSize; i++) {
innerDataBuffer->bytes()[keySize + i] = innerDataBuffer->bytes()[encryptedDataSize + paddedDataSize - i - 1];
}
RAND_bytes(innerDataBuffer->bytes(), keySize);
SHA256_CTX sha256Ctx;
SHA256_Init(&sha256Ctx);
SHA256_Update(&sha256Ctx, innerDataBuffer->bytes(), keySize);
SHA256_Update(&sha256Ctx, innerDataBuffer->bytes() + encryptedDataSize, paddedDataSize);
SHA256_Final(innerDataBuffer->bytes() + keySize + paddedDataSize, &sha256Ctx);
memset(innerDataBuffer->bytes() + encryptedDataSize + paddedDataSize, 0, ivSize);
Datacenter::aesIgeEncryption(innerDataBuffer->bytes() + keySize, innerDataBuffer->bytes(), innerDataBuffer->bytes() + encryptedDataSize + paddedDataSize, true, true, paddedDataSize + SHA256_DIGEST_LENGTH);
SHA256_Init(&sha256Ctx);
SHA256_Update(&sha256Ctx, innerDataBuffer->bytes() + keySize, paddedDataSize + SHA256_DIGEST_LENGTH);
SHA256_Final(innerDataBuffer->bytes() + encryptedDataSize + paddedDataSize + ivSize, &sha256Ctx);
for (uint32_t i = 0; i < keySize; i++) {
innerDataBuffer->bytes()[i] ^= innerDataBuffer->bytes()[encryptedDataSize + paddedDataSize + ivSize + i];
}
bool ok = false;
uint32_t offset = encryptedDataSize + paddedDataSize + ivSize + SHA256_DIGEST_LENGTH;
size_t resLen = BN_bn2bin(rsaKey->n, innerDataBuffer->bytes() + offset);
const auto shift = (256 - resLen);
for (auto i = 0; i != 256; ++i) {
const auto a = innerDataBuffer->bytes()[i];
const auto b = (i < shift) ? 0 : innerDataBuffer->bytes()[offset + i - shift];
if (a > b) {
break;
} else if (a < b) {
ok = true;
break;
}
}
if (ok) {
break;
}
}
if (bnContext == nullptr) {
bnContext = BN_CTX_new();
}
BIGNUM *a = BN_bin2bn(innerDataBuffer->bytes(), encryptedDataSize, nullptr);
BIGNUM *r = BN_new();
BN_mod_exp(r, a, rsaKey->e, rsaKey->n, bnContext);
uint32_t size = BN_num_bytes(r);
auto rsaEncryptedData = new ByteArray(size >= 256 ? size : 256);
BN_bn2bin(r, rsaEncryptedData->bytes + (size < 256 ? (256 - size) : 0));
if (256 - size > 0) {
memset(rsaEncryptedData->bytes, 0, 256 - size);
}
BN_free(a);
BN_free(r);
RSA_free(rsaKey);
innerDataBuffer->reuse();
request->encrypted_data = std::unique_ptr<ByteArray>(rsaEncryptedData);
sendAckRequest(messageId);
sendRequestData(request, true);
} else {
if (LOGS_ENABLED) DEBUG_E("account%u dc%u handshake: invalid client nonce, type = %d", currentDatacenter->instanceNum, currentDatacenter->datacenterId, handshakeType);
beginHandshake(false);
}
} else if (dynamic_cast<Server_DH_Params *>(message)) {
if (typeInfo == typeid(TL_server_DH_params_ok)) {
if (handshakeState != 2) {
sendAckRequest(messageId);
return;
}
handshakeState = 3;
TL_server_DH_params_ok *result = (TL_server_DH_params_ok *) message;
NativeByteBuffer *tmpAesKeyAndIv = BuffersStorage::getInstance().getFreeBuffer(84);
NativeByteBuffer *newNonceAndServerNonce = BuffersStorage::getInstance().getFreeBuffer(authNewNonce->length + authServerNonce->length);
newNonceAndServerNonce->writeBytes(authNewNonce);
newNonceAndServerNonce->writeBytes(authServerNonce);
SHA1(newNonceAndServerNonce->bytes(), newNonceAndServerNonce->limit(), tmpAesKeyAndIv->bytes());
newNonceAndServerNonce->reuse();
NativeByteBuffer *serverNonceAndNewNonce = BuffersStorage::getInstance().getFreeBuffer(authServerNonce->length + authNewNonce->length);
serverNonceAndNewNonce->writeBytes(authServerNonce);
serverNonceAndNewNonce->writeBytes(authNewNonce);
SHA1(serverNonceAndNewNonce->bytes(), serverNonceAndNewNonce->limit(), tmpAesKeyAndIv->bytes() + 20);
serverNonceAndNewNonce->reuse();
NativeByteBuffer *newNonceAndNewNonce = BuffersStorage::getInstance().getFreeBuffer(authNewNonce->length + authNewNonce->length);
newNonceAndNewNonce->writeBytes(authNewNonce);
newNonceAndNewNonce->writeBytes(authNewNonce);
SHA1(newNonceAndNewNonce->bytes(), newNonceAndNewNonce->limit(), tmpAesKeyAndIv->bytes() + 40);
newNonceAndNewNonce->reuse();
memcpy(tmpAesKeyAndIv->bytes() + 60, authNewNonce->bytes, 4);
Datacenter::aesIgeEncryption(result->encrypted_answer->bytes, tmpAesKeyAndIv->bytes(), tmpAesKeyAndIv->bytes() + 32, false, false, result->encrypted_answer->length);
bool hashVerified = false;
for (uint32_t i = 0; i < 16; i++) {
SHA1(result->encrypted_answer->bytes + SHA_DIGEST_LENGTH, result->encrypted_answer->length - i - SHA_DIGEST_LENGTH, tmpAesKeyAndIv->bytes() + 64);
if (!memcmp(tmpAesKeyAndIv->bytes() + 64, result->encrypted_answer->bytes, SHA_DIGEST_LENGTH)) {
hashVerified = true;
break;
}
}
if (!hashVerified) {
if (LOGS_ENABLED) DEBUG_E("account%u dc%u handshake: can't decode DH params, type = %d", currentDatacenter->instanceNum, currentDatacenter->datacenterId, handshakeType);
beginHandshake(false);
return;
}
bool error = false;
NativeByteBuffer *answerWithHash = new NativeByteBuffer(result->encrypted_answer->bytes + SHA_DIGEST_LENGTH, result->encrypted_answer->length - SHA_DIGEST_LENGTH);
uint32_t constructor = answerWithHash->readUint32(&error);
TL_server_DH_inner_data *dhInnerData = TL_server_DH_inner_data::TLdeserialize(answerWithHash, constructor, currentDatacenter->instanceNum, error);
delete answerWithHash;
if (error) {
if (LOGS_ENABLED) DEBUG_E("account%u dc%u handshake: can't parse decoded DH params, type = %d", currentDatacenter->instanceNum, currentDatacenter->datacenterId, handshakeType);
beginHandshake(false);
return;
}
if (!authNonce->isEqualTo(dhInnerData->nonce.get())) {
if (LOGS_ENABLED) DEBUG_E("account%u dc%u handshake: invalid DH nonce, type = %d", currentDatacenter->instanceNum, currentDatacenter->datacenterId, handshakeType);
beginHandshake(false);
return;
}
if (!authServerNonce->isEqualTo(dhInnerData->server_nonce.get())) {
if (LOGS_ENABLED) DEBUG_E("account%u dc%u handshake: invalid DH server nonce, type = %d", currentDatacenter->instanceNum, currentDatacenter->datacenterId, handshakeType);
beginHandshake(false);
return;
}
BIGNUM *p = BN_bin2bn(dhInnerData->dh_prime->bytes, dhInnerData->dh_prime->length, NULL);
if (p == nullptr) {
if (LOGS_ENABLED) DEBUG_E("can't allocate BIGNUM p");
exit(1);
}
if (!isGoodPrime(p, dhInnerData->g)) {
if (LOGS_ENABLED) DEBUG_E("account%u dc%u handshake: bad prime, type = %d", currentDatacenter->instanceNum, currentDatacenter->datacenterId, handshakeType);
beginHandshake(false);
BN_free(p);
return;
}
BIGNUM *g_a = BN_new();
if (g_a == nullptr) {
if (LOGS_ENABLED) DEBUG_E("can't allocate BIGNUM g_a");
exit(1);
}
BN_bin2bn(dhInnerData->g_a->bytes, dhInnerData->g_a->length, g_a);
if (!isGoodGaAndGb(g_a, p)) {
if (LOGS_ENABLED) DEBUG_E("account%u dc%u handshake: bad prime and g_a, type = %d", currentDatacenter->instanceNum, currentDatacenter->datacenterId, handshakeType);
beginHandshake(false);
BN_free(p);
BN_free(g_a);
return;
}
BIGNUM *g = BN_new();
if (g == nullptr) {
if (LOGS_ENABLED) DEBUG_E("can't allocate BIGNUM g");
exit(1);
}
if (!BN_set_word(g, dhInnerData->g)) {
if (LOGS_ENABLED) DEBUG_E("OpenSSL error at BN_set_word(g_b, dhInnerData->g)");
beginHandshake(false);
BN_free(g);
BN_free(g_a);
BN_free(p);
return;
}
thread_local static uint8_t bytes[256];
RAND_bytes(bytes, 256);
BIGNUM *b = BN_bin2bn(bytes, 256, NULL);
if (b == nullptr) {
if (LOGS_ENABLED) DEBUG_E("can't allocate BIGNUM b");
exit(1);
}
BIGNUM *g_b = BN_new();
if (!BN_mod_exp(g_b, g, b, p, bnContext)) {
if (LOGS_ENABLED) DEBUG_E("OpenSSL error at BN_mod_exp(g_b, g, b, p, bnContext)");
beginHandshake(false);
BN_free(g);
BN_free(g_a);
BN_free(g_b);
BN_free(b);
BN_free(p);
return;
}
TL_client_DH_inner_data *clientInnerData = new TL_client_DH_inner_data();
clientInnerData->g_b = std::unique_ptr<ByteArray>(new ByteArray(BN_num_bytes(g_b)));
BN_bn2bin(g_b, clientInnerData->g_b->bytes);
clientInnerData->nonce = std::unique_ptr<ByteArray>(new ByteArray(authNonce));
clientInnerData->server_nonce = std::unique_ptr<ByteArray>(new ByteArray(authServerNonce));
clientInnerData->retry_id = 0;
BN_free(g_b);
BN_free(g);
BIGNUM *authKeyNum = BN_new();
BN_mod_exp(authKeyNum, g_a, b, p, bnContext);
size_t l = BN_num_bytes(authKeyNum);
handshakeAuthKey = new ByteArray(256);
BN_bn2bin(authKeyNum, handshakeAuthKey->bytes);
if (l < 256) {
memmove(handshakeAuthKey->bytes + 256 - l, handshakeAuthKey->bytes, l);
memset(handshakeAuthKey->bytes, 0, 256 - l);
}
BN_free(authKeyNum);
BN_free(g_a);
BN_free(b);
BN_free(p);
uint32_t clientInnerDataSize = clientInnerData->getObjectSize();
uint32_t additionalSize = (clientInnerDataSize + SHA_DIGEST_LENGTH) % 16;
if (additionalSize != 0) {
additionalSize = 16 - additionalSize;
}
NativeByteBuffer *clientInnerDataBuffer = BuffersStorage::getInstance().getFreeBuffer(clientInnerDataSize + additionalSize + SHA_DIGEST_LENGTH);
clientInnerDataBuffer->position(SHA_DIGEST_LENGTH);
clientInnerData->serializeToStream(clientInnerDataBuffer);
delete clientInnerData;
SHA1(clientInnerDataBuffer->bytes() + SHA_DIGEST_LENGTH, clientInnerDataSize, clientInnerDataBuffer->bytes());
if (additionalSize != 0) {
RAND_bytes(clientInnerDataBuffer->bytes() + SHA_DIGEST_LENGTH + clientInnerDataSize, additionalSize);
}
TL_set_client_DH_params *setClientDhParams = new TL_set_client_DH_params();
setClientDhParams->nonce = std::unique_ptr<ByteArray>(new ByteArray(authNonce));
setClientDhParams->server_nonce = std::unique_ptr<ByteArray>(new ByteArray(authServerNonce));
Datacenter::aesIgeEncryption(clientInnerDataBuffer->bytes(), tmpAesKeyAndIv->bytes(), tmpAesKeyAndIv->bytes() + 32, true, false, clientInnerDataBuffer->limit());
setClientDhParams->encrypted_data = std::unique_ptr<ByteArray>(new ByteArray(clientInnerDataBuffer->bytes(), clientInnerDataBuffer->limit()));
clientInnerDataBuffer->reuse();
tmpAesKeyAndIv->reuse();
sendAckRequest(messageId);
sendRequestData(setClientDhParams, true);
int32_t currentTime = (int32_t) (ConnectionsManager::getInstance(currentDatacenter->instanceNum).getCurrentTimeMillis() / 1000);
timeDifference = dhInnerData->server_time - currentTime;
handshakeServerSalt = new TL_future_salt();
handshakeServerSalt->valid_since = currentTime + timeDifference - 5;
handshakeServerSalt->valid_until = handshakeServerSalt->valid_since + 30 * 60;
for (int32_t a = 7; a >= 0; a--) {
handshakeServerSalt->salt <<= 8;
handshakeServerSalt->salt |= (authNewNonce->bytes[a] ^ authServerNonce->bytes[a]);
}
} else {
if (LOGS_ENABLED) DEBUG_E("account%u dc%u handshake: can't set DH params, type = %d", currentDatacenter->instanceNum, currentDatacenter->datacenterId, handshakeType);
beginHandshake(false);
}
} else if (dynamic_cast<Set_client_DH_params_answer *>(message)) {
if (handshakeState != 3) {
sendAckRequest(messageId);
return;
}
handshakeState = 4;
Set_client_DH_params_answer *result = (Set_client_DH_params_answer *) message;
if (!authNonce->isEqualTo(result->nonce.get())) {
if (LOGS_ENABLED) DEBUG_E("account%u dc%u handshake: invalid DH answer nonce, type = %d", currentDatacenter->instanceNum, currentDatacenter->datacenterId, handshakeType);
beginHandshake(false);
return;
}
if (!authServerNonce->isEqualTo(result->server_nonce.get())) {
if (LOGS_ENABLED) DEBUG_E("account%u dc%u handshake: invalid DH answer server nonce, type = %d", currentDatacenter->instanceNum, currentDatacenter->datacenterId, handshakeType);
beginHandshake(false);
return;
}
sendAckRequest(messageId);
uint32_t authKeyAuxHashLength = authNewNonce->length + SHA_DIGEST_LENGTH + 1;
NativeByteBuffer *authKeyAuxHashBuffer = BuffersStorage::getInstance().getFreeBuffer(authKeyAuxHashLength + SHA_DIGEST_LENGTH);
authKeyAuxHashBuffer->writeBytes(authNewNonce);
SHA1(handshakeAuthKey->bytes, handshakeAuthKey->length, authKeyAuxHashBuffer->bytes() + authNewNonce->length + 1);
if (typeInfo == typeid(TL_dh_gen_ok)) {
authKeyAuxHashBuffer->writeByte(1);
SHA1(authKeyAuxHashBuffer->bytes(), authKeyAuxHashLength - 12, authKeyAuxHashBuffer->bytes() + authKeyAuxHashLength);
if (memcmp(result->new_nonce_hash1->bytes, authKeyAuxHashBuffer->bytes() + authKeyAuxHashLength + SHA_DIGEST_LENGTH - 16, 16)) {
if (LOGS_ENABLED) DEBUG_E("account%u dc%u handshake: invalid DH answer nonce hash 1, type = %d", currentDatacenter->instanceNum, currentDatacenter->datacenterId, handshakeType);
authKeyAuxHashBuffer->reuse();
beginHandshake(false);
} else {
if (LOGS_ENABLED) DEBUG_D("account%u dc%u handshake: completed, time difference = %d, type = %d", currentDatacenter->instanceNum, currentDatacenter->datacenterId, timeDifference, handshakeType);
authKeyAuxHashBuffer->position(authNewNonce->length + 1 + 12);
authKeyTempPendingId = authKeyAuxHashBuffer->readInt64(nullptr);
authKeyAuxHashBuffer->reuse();
if (handshakeRequest != nullptr) {
delete handshakeRequest;
handshakeRequest = nullptr;
}
std::unique_ptr<TL_future_salt> salt = std::unique_ptr<TL_future_salt>(handshakeServerSalt);
currentDatacenter->clearServerSalts(handshakeType == HandshakeTypeMediaTemp);
currentDatacenter->addServerSalt(salt, handshakeType == HandshakeTypeMediaTemp);
handshakeServerSalt = nullptr;
if (handshakeType == HandshakeTypePerm) {
ConnectionsManager::getInstance(currentDatacenter->instanceNum).scheduleTask([&] {
ByteArray *authKey = handshakeAuthKey;
handshakeAuthKey = nullptr;
delegate->onHandshakeComplete(this, authKeyTempPendingId, authKey, timeDifference);
});
} else {
authKeyTempPending = handshakeAuthKey;
handshakeAuthKey = nullptr;
Connection *connection = getConnection();
TL_auth_bindTempAuthKey *request = new TL_auth_bindTempAuthKey();
request->initFunc = [&, request, connection](int64_t messageId) {
TL_bind_auth_key_inner *inner = new TL_bind_auth_key_inner();
inner->expires_at = ConnectionsManager::getInstance(currentDatacenter->instanceNum).getCurrentTime() + timeDifference + TEMP_AUTH_KEY_EXPIRE_TIME;
inner->perm_auth_key_id = currentDatacenter->authKeyPermId;
inner->temp_auth_key_id = authKeyTempPendingId;
RAND_bytes((uint8_t *) &inner->nonce, 8);
inner->temp_session_id = connection->getSessionId();
NetworkMessage *networkMessage = new NetworkMessage();
networkMessage->message = std::make_unique<TL_message>();
networkMessage->message->msg_id = authKeyPendingMessageId = messageId;
networkMessage->message->bytes = inner->getObjectSize();
networkMessage->message->body = std::unique_ptr<TLObject>(inner);
networkMessage->message->seqno = 0;
std::vector<std::unique_ptr<NetworkMessage>> array;
array.push_back(std::unique_ptr<NetworkMessage>(networkMessage));
request->perm_auth_key_id = inner->perm_auth_key_id;
request->nonce = inner->nonce;
request->expires_at = inner->expires_at;
request->encrypted_message = currentDatacenter->createRequestsData(array, nullptr, connection, true);
};
authKeyPendingRequestId = ConnectionsManager::getInstance(currentDatacenter->instanceNum).sendRequest(request, [&](TLObject *response, TL_error *error, int32_t networkType, int64_t responseTime) {
authKeyPendingMessageId = 0;
authKeyPendingRequestId = 0;
if (response != nullptr && typeid(*response) == typeid(TL_boolTrue)) {
if (LOGS_ENABLED) DEBUG_D("account%u dc%u handshake: bind completed", currentDatacenter->instanceNum, currentDatacenter->datacenterId);
ConnectionsManager::getInstance(currentDatacenter->instanceNum).scheduleTask([&] {
ByteArray *authKey = authKeyTempPending;
authKeyTempPending = nullptr;
delegate->onHandshakeComplete(this, authKeyTempPendingId, authKey, timeDifference);
});
} else if (error == nullptr || error->code != 400 || error->text.find("ENCRYPTED_MESSAGE_INVALID") == std::string::npos) {
ConnectionsManager::getInstance(currentDatacenter->instanceNum).scheduleTask([&] {
beginHandshake(true);
});
}
}, nullptr, RequestFlagWithoutLogin | RequestFlagEnableUnauthorized | RequestFlagUseUnboundKey, currentDatacenter->datacenterId, connection->getConnectionType(), true, 0);
}
}
} else if (typeInfo == typeid(TL_dh_gen_retry)) {
authKeyAuxHashBuffer->writeByte(2);
SHA1(authKeyAuxHashBuffer->bytes(), authKeyAuxHashLength - 12, authKeyAuxHashBuffer->bytes() + authKeyAuxHashLength);
if (memcmp(result->new_nonce_hash2->bytes, authKeyAuxHashBuffer->bytes() + authKeyAuxHashLength + SHA_DIGEST_LENGTH - 16, 16)) {
if (LOGS_ENABLED) DEBUG_E("account%u dc%u handshake: invalid DH answer nonce hash 2, type = %d", currentDatacenter->instanceNum, currentDatacenter->datacenterId, handshakeType);
beginHandshake(false);
} else {
if (LOGS_ENABLED) DEBUG_D("account%u dc%u handshake: retry DH, type = %d", currentDatacenter->instanceNum, currentDatacenter->datacenterId, handshakeType);
beginHandshake(false);
}
authKeyAuxHashBuffer->reuse();
} else if (typeInfo == typeid(TL_dh_gen_fail)) {
authKeyAuxHashBuffer->writeByte(3);
SHA1(authKeyAuxHashBuffer->bytes(), authKeyAuxHashLength - 12, authKeyAuxHashBuffer->bytes() + authKeyAuxHashLength);
if (memcmp(result->new_nonce_hash3->bytes, authKeyAuxHashBuffer->bytes() + authKeyAuxHashLength + SHA_DIGEST_LENGTH - 16, 16)) {
if (LOGS_ENABLED) DEBUG_E("account%u dc%u handshake: invalid DH answer nonce hash 3, type = %d", currentDatacenter->instanceNum, currentDatacenter->datacenterId, handshakeType);
beginHandshake(false);
} else {
if (LOGS_ENABLED) DEBUG_E("account%u dc%u handshake: server declined DH params, type = %d", currentDatacenter->instanceNum, currentDatacenter->datacenterId, handshakeType);
beginHandshake(false);
}
authKeyAuxHashBuffer->reuse();
}
}
}
void Handshake::sendAckRequest(int64_t messageId) {
auto msgsAck = new TL_msgs_ack();
msgsAck->msg_ids.push_back(messageId);
sendRequestData(msgsAck, false);
}
TLObject *Handshake::getCurrentHandshakeRequest() {
return handshakeRequest;
}
void Handshake::saveCdnConfigInternal(NativeByteBuffer *buffer) {
buffer->writeInt32(1);
buffer->writeInt32((int32_t) cdnPublicKeys.size());
for (auto & cdnPublicKey : cdnPublicKeys) {
buffer->writeInt32(cdnPublicKey.first);
buffer->writeString(cdnPublicKey.second);
buffer->writeInt64(cdnPublicKeysFingerprints[cdnPublicKey.first]);
}
}
void Handshake::saveCdnConfig(Datacenter *datacenter) {
if (cdnConfig == nullptr) {
cdnConfig = new Config(datacenter->instanceNum, "cdnkeys.dat");
}
thread_local static auto sizeCalculator = new NativeByteBuffer(true);
sizeCalculator->clearCapacity();
saveCdnConfigInternal(sizeCalculator);
NativeByteBuffer *buffer = BuffersStorage::getInstance().getFreeBuffer(sizeCalculator->capacity());
saveCdnConfigInternal(buffer);
cdnConfig->writeConfig(buffer);
buffer->reuse();
}
void Handshake::loadCdnConfig(Datacenter *datacenter) {
if (std::find(cdnWaitingDatacenters.begin(), cdnWaitingDatacenters.end(), datacenter) != cdnWaitingDatacenters.end()) {
return;
}
cdnWaitingDatacenters.push_back(datacenter);
if (loadingCdnKeys) {
return;
}
if (cdnPublicKeysFingerprints.empty()) {
if (cdnConfig == nullptr) {
cdnConfig = new Config(datacenter->instanceNum, "cdnkeys.dat");
}
NativeByteBuffer *buffer = cdnConfig->readConfig();
if (buffer != nullptr) {
uint32_t version = buffer->readUint32(nullptr);
if (version >= 1) {
size_t count = buffer->readUint32(nullptr);
for (uint32_t a = 0; a < count; a++) {
int dcId = buffer->readInt32(nullptr);
cdnPublicKeys[dcId] = buffer->readString(nullptr);
cdnPublicKeysFingerprints[dcId] = buffer->readUint64(nullptr);
}
}
buffer->reuse();
if (!cdnPublicKeysFingerprints.empty()) {
size_t count = cdnWaitingDatacenters.size();
for (uint32_t a = 0; a < count; a++) {
cdnWaitingDatacenters[a]->beginHandshake(HandshakeTypeCurrent, false);
}
cdnWaitingDatacenters.clear();
return;
}
}
}
loadingCdnKeys = true;
auto request = new TL_help_getCdnConfig();
ConnectionsManager::getInstance(datacenter->instanceNum).sendRequest(request, [&, datacenter](TLObject *response, TL_error *error, int32_t networkType, int64_t responseTime) {
if (response != nullptr) {
auto config = (TL_cdnConfig *) response;
size_t count = config->public_keys.size();
BIO *keyBio = BIO_new(BIO_s_mem());
NativeByteBuffer *buffer = BuffersStorage::getInstance().getFreeBuffer(1024);
thread_local static uint8_t sha1Buffer[20];
for (uint32_t a = 0; a < count; a++) {
TL_cdnPublicKey *publicKey = config->public_keys[a].get();
cdnPublicKeys[publicKey->dc_id] = publicKey->public_key;
BIO_write(keyBio, publicKey->public_key.c_str(), (int) publicKey->public_key.length());
RSA *rsaKey = PEM_read_bio_RSAPublicKey(keyBio, nullptr, nullptr, nullptr);
int nBytes = BN_num_bytes(rsaKey->n);
int eBytes = BN_num_bytes(rsaKey->e);
std::string nStr(nBytes, 0), eStr(eBytes, 0);
BN_bn2bin(rsaKey->n, (uint8_t *)&nStr[0]);
BN_bn2bin(rsaKey->e, (uint8_t *)&eStr[0]);
buffer->writeString(nStr);
buffer->writeString(eStr);
SHA1(buffer->bytes(), buffer->position(), sha1Buffer);
cdnPublicKeysFingerprints[publicKey->dc_id] = ((uint64_t) sha1Buffer[19]) << 56 |
((uint64_t) sha1Buffer[18]) << 48 |
((uint64_t) sha1Buffer[17]) << 40 |
((uint64_t) sha1Buffer[16]) << 32 |
((uint64_t) sha1Buffer[15]) << 24 |
((uint64_t) sha1Buffer[14]) << 16 |
((uint64_t) sha1Buffer[13]) << 8 |
((uint64_t) sha1Buffer[12]);
RSA_free(rsaKey);
if (a != count - 1) {
buffer->position(0);
BIO_reset(keyBio);
}
}
buffer->reuse();
BIO_free(keyBio);
count = cdnWaitingDatacenters.size();
for (uint32_t a = 0; a < count; a++) {
cdnWaitingDatacenters[a]->beginHandshake(HandshakeTypeCurrent, false);
}
cdnWaitingDatacenters.clear();
saveCdnConfig(datacenter);
}
loadingCdnKeys = false;
}, nullptr, RequestFlagEnableUnauthorized | RequestFlagWithoutLogin, DEFAULT_DATACENTER_ID, ConnectionTypeGeneric, true);
}
HandshakeType Handshake::getType() {
return handshakeType;
}
ByteArray *Handshake::getPendingAuthKey() {
return authKeyTempPending;
}
int64_t Handshake::getPendingAuthKeyId() {
return authKeyTempPendingId;
}
void Handshake::onHandshakeConnectionClosed() {
if (handshakeState == 0) {
return;
}
needResendData = true;
}
void Handshake::onHandshakeConnectionConnected() {
if (handshakeState == 0 || !needResendData) {
return;
}
beginHandshake(false);
}
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