788 lines
20 KiB
C++
788 lines
20 KiB
C++
/*
|
|
This file is part of Telegram Desktop,
|
|
the official desktop application for the Telegram messaging service.
|
|
|
|
For license and copyright information please follow this link:
|
|
https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
|
|
*/
|
|
#include "mtproto/details/mtproto_tls_socket.h"
|
|
|
|
#include "mtproto/details/mtproto_tcp_socket.h"
|
|
#include "base/openssl_help.h"
|
|
#include "base/bytes.h"
|
|
#include "base/invoke_queued.h"
|
|
#include "base/unixtime.h"
|
|
#include "base/qt_adapters.h"
|
|
|
|
#include <QtCore/QtEndian>
|
|
#include <range/v3/algorithm/reverse.hpp>
|
|
|
|
namespace MTP::details {
|
|
namespace {
|
|
|
|
constexpr auto kMaxGrease = 8;
|
|
constexpr auto kClientHelloLength = 517;
|
|
constexpr auto kHelloDigestLength = 32;
|
|
constexpr auto kLengthSize = sizeof(uint16);
|
|
const auto kServerHelloPart1 = qstr("\x16\x03\x03");
|
|
const auto kServerHelloPart3 = qstr("\x14\x03\x03\x00\x01\x01\x17\x03\x03");
|
|
constexpr auto kServerHelloDigestPosition = 11;
|
|
const auto kServerHeader = qstr("\x17\x03\x03");
|
|
constexpr auto kClientPartSize = 2878;
|
|
const auto kClientPrefix = qstr("\x14\x03\x03\x00\x01\x01");
|
|
const auto kClientHeader = qstr("\x17\x03\x03");
|
|
|
|
using BigNum = openssl::BigNum;
|
|
using BigNumContext = openssl::Context;
|
|
|
|
[[nodiscard]] MTPTlsClientHello PrepareClientHelloRules() {
|
|
auto stack = std::vector<QVector<MTPTlsBlock>>();
|
|
const auto pushToBack = [&](MTPTlsBlock &&block) {
|
|
Expects(!stack.empty());
|
|
|
|
stack.back().push_back(std::move(block));
|
|
};
|
|
const auto S = [&](QLatin1String s) {
|
|
const auto data = QByteArray(s.data(), s.size());
|
|
pushToBack(MTP_tlsBlockString(MTP_bytes(data)));
|
|
};
|
|
const auto Z = [&](int length) {
|
|
pushToBack(MTP_tlsBlockZero(MTP_int(length)));
|
|
};
|
|
const auto G = [&](int seed) {
|
|
pushToBack(MTP_tlsBlockGrease(MTP_int(seed)));
|
|
};
|
|
const auto R = [&](int length) {
|
|
pushToBack(MTP_tlsBlockRandom(MTP_int(length)));
|
|
};
|
|
const auto D = [&] {
|
|
pushToBack(MTP_tlsBlockDomain());
|
|
};
|
|
const auto K = [&] {
|
|
pushToBack(MTP_tlsBlockPublicKey());
|
|
};
|
|
const auto Open = [&] {
|
|
stack.emplace_back();
|
|
};
|
|
const auto Close = [&] {
|
|
Expects(stack.size() > 1);
|
|
|
|
const auto blocks = std::move(stack.back());
|
|
stack.pop_back();
|
|
pushToBack(MTP_tlsBlockScope(MTP_vector<MTPTlsBlock>(blocks)));
|
|
};
|
|
const auto Finish = [&] {
|
|
Expects(stack.size() == 1);
|
|
|
|
return stack.back();
|
|
};
|
|
|
|
stack.emplace_back();
|
|
|
|
S(qstr("\x16\x03\x01\x02\x00\x01\x00\x01\xfc\x03\x03"));
|
|
Z(32);
|
|
S(qstr("\x20"));
|
|
R(32);
|
|
S(qstr("\x00\x20"));
|
|
G(0);
|
|
S(qstr(""
|
|
"\x13\x01\x13\x02\x13\x03\xc0\x2b\xc0\x2f\xc0\x2c\xc0\x30\xcc\xa9"
|
|
"\xcc\xa8\xc0\x13\xc0\x14\x00\x9c\x00\x9d\x00\x2f\x00\x35\x01\x00"
|
|
"\x01\x93"));
|
|
G(2);
|
|
S(qstr("\x00\x00\x00\x00"));
|
|
Open();
|
|
Open();
|
|
S(qstr("\x00"));
|
|
Open();
|
|
D();
|
|
Close();
|
|
Close();
|
|
Close();
|
|
S(qstr("\x00\x17\x00\x00\xff\x01\x00\x01\x00\x00\x0a\x00\x0a\x00\x08"));
|
|
G(4);
|
|
S(qstr(""
|
|
"\x00\x1d\x00\x17\x00\x18\x00\x0b\x00\x02\x01\x00\x00\x23\x00\x00"
|
|
"\x00\x10\x00\x0e\x00\x0c\x02\x68\x32\x08\x68\x74\x74\x70\x2f\x31"
|
|
"\x2e\x31\x00\x05\x00\x05\x01\x00\x00\x00\x00\x00\x0d\x00\x12\x00"
|
|
"\x10\x04\x03\x08\x04\x04\x01\x05\x03\x08\x05\x05\x01\x08\x06\x06"
|
|
"\x01\x00\x12\x00\x00\x00\x33\x00\x2b\x00\x29"));
|
|
G(4);
|
|
S(qstr("\x00\x01\x00\x00\x1d\x00\x20"));
|
|
K();
|
|
S(qstr("\x00\x2d\x00\x02\x01\x01\x00\x2b\x00\x0b\x0a"));
|
|
G(6);
|
|
S(qstr("\x03\x04\x03\x03\x03\x02\x03\x01\x00\x1b\x00\x03\x02\x00\x02"));
|
|
G(3);
|
|
S(qstr("\x00\x01\x00\x00\x15"));
|
|
|
|
return MTP_tlsClientHello(MTP_vector<MTPTlsBlock>(Finish()));
|
|
}
|
|
|
|
[[nodiscard]] bytes::vector PrepareGreases() {
|
|
auto result = bytes::vector(kMaxGrease);
|
|
bytes::set_random(result);
|
|
for (auto &byte : result) {
|
|
byte = bytes::type((uchar(byte) & 0xF0) + 0x0A);
|
|
}
|
|
static_assert(kMaxGrease % 2 == 0);
|
|
for (auto i = 0; i != kMaxGrease; i += 2) {
|
|
if (result[i] == result[i + 1]) {
|
|
result[i + 1] = bytes::type(uchar(result[i + 1]) ^ 0x10);
|
|
}
|
|
}
|
|
return result;
|
|
}
|
|
|
|
// Returns y^2 = x^3 + 486662 * x^2 + x.
|
|
[[nodiscard]] BigNum GenerateY2(
|
|
const BigNum &x,
|
|
const BigNum &mod,
|
|
const BigNumContext &context) {
|
|
auto coef = BigNum(486662);
|
|
auto y = BigNum::ModAdd(x, coef, mod, context);
|
|
y.setModMul(y, x, mod, context);
|
|
coef.setWord(1);
|
|
y.setModAdd(y, coef, mod, context);
|
|
return BigNum::ModMul(y, x, mod, context);
|
|
}
|
|
|
|
// Returns x_2 = (x^2 - 1)^2/(4*y^2).
|
|
[[nodiscard]] BigNum GenerateX2(
|
|
const BigNum &x,
|
|
const BigNum &mod,
|
|
const BigNumContext &context) {
|
|
auto denominator = GenerateY2(x, mod, context);
|
|
auto coef = BigNum(4);
|
|
denominator.setModMul(denominator, coef, mod, context);
|
|
|
|
auto numerator = BigNum::ModMul(x, x, mod, context);
|
|
coef.setWord(1);
|
|
numerator.setModSub(numerator, coef, mod, context);
|
|
numerator.setModMul(numerator, numerator, mod, context);
|
|
|
|
denominator.setModInverse(denominator, mod, context);
|
|
return BigNum::ModMul(numerator, denominator, mod, context);
|
|
}
|
|
|
|
[[nodiscard]] bytes::vector GeneratePublicKey() {
|
|
const auto context = BigNumContext();
|
|
const char modBytes[] = ""
|
|
"\x7f\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff"
|
|
"\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xed";
|
|
const char powBytes[] = ""
|
|
"\x3f\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff"
|
|
"\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xf6";
|
|
const auto mod = BigNum(bytes::make_span(modBytes).subspan(0, 32));
|
|
const auto pow = BigNum(bytes::make_span(powBytes).subspan(0, 32));
|
|
|
|
auto x = BigNum();
|
|
do {
|
|
while (true) {
|
|
auto random = bytes::vector(32);
|
|
bytes::set_random(random);
|
|
random[31] &= bytes::type(0x7FU);
|
|
x.setBytes(random);
|
|
x.setModMul(x, x, mod, context);
|
|
|
|
auto y = GenerateY2(x, mod, context);
|
|
if (BigNum::ModExp(y, pow, mod, context).isOne()) {
|
|
break;
|
|
}
|
|
}
|
|
for (auto i = 0; i != 3; ++i) {
|
|
x = GenerateX2(x, mod, context);
|
|
}
|
|
const auto xBytes = x.getBytes();
|
|
Assert(!xBytes.empty());
|
|
Assert(xBytes.size() <= 32);
|
|
} while (x.bytesSize() == 32);
|
|
|
|
const auto xBytes = x.getBytes();
|
|
auto result = bytes::vector(32, bytes::type());
|
|
bytes::copy(
|
|
bytes::make_span(result).subspan(32 - xBytes.size()),
|
|
xBytes);
|
|
ranges::reverse(result);
|
|
|
|
//auto string = QString();
|
|
//string.reserve(64);
|
|
//for (const auto byte : result) {
|
|
// const auto code = uchar(byte);
|
|
// const auto hex = [](uchar value) -> char {
|
|
// if (value >= 0 && value <= 9) {
|
|
// return '0' + value;
|
|
// } else if (value >= 10 && value <= 15) {
|
|
// return 'a' + (value - 10);
|
|
// }
|
|
// return '-';
|
|
// };
|
|
// string.append(hex(code / 16)).append(hex(code % 16));
|
|
//}
|
|
//LOG(("KEY: %1").arg(string));
|
|
|
|
return result;
|
|
}
|
|
|
|
struct ClientHello {
|
|
QByteArray data;
|
|
QByteArray digest;
|
|
};
|
|
|
|
class ClientHelloGenerator {
|
|
public:
|
|
ClientHelloGenerator(
|
|
const MTPTlsClientHello &rules,
|
|
bytes::const_span domain,
|
|
bytes::const_span key);
|
|
[[nodiscard]] ClientHello result();
|
|
|
|
private:
|
|
[[nodiscard]] bytes::span grow(int size);
|
|
void writeBlocks(const QVector<MTPTlsBlock> &blocks);
|
|
void writeBlock(const MTPTlsBlock &data);
|
|
void writeBlock(const MTPDtlsBlockString &data);
|
|
void writeBlock(const MTPDtlsBlockZero &data);
|
|
void writeBlock(const MTPDtlsBlockGrease &data);
|
|
void writeBlock(const MTPDtlsBlockRandom &data);
|
|
void writeBlock(const MTPDtlsBlockDomain &data);
|
|
void writeBlock(const MTPDtlsBlockPublicKey &data);
|
|
void writeBlock(const MTPDtlsBlockScope &data);
|
|
void writePadding();
|
|
void writeDigest();
|
|
void writeTimestamp();
|
|
|
|
bytes::const_span _domain;
|
|
bytes::const_span _key;
|
|
bytes::vector _greases;
|
|
std::vector<int> _scopeStack;
|
|
QByteArray _result;
|
|
QByteArray _digest;
|
|
int _digestPosition = -1;
|
|
bool _error = false;
|
|
|
|
};
|
|
|
|
ClientHelloGenerator::ClientHelloGenerator(
|
|
const MTPTlsClientHello &rules,
|
|
bytes::const_span domain,
|
|
bytes::const_span key)
|
|
: _domain(domain)
|
|
, _key(key)
|
|
, _greases(PrepareGreases()) {
|
|
_result.reserve(kClientHelloLength);
|
|
writeBlocks(rules.match([&](const MTPDtlsClientHello &data) {
|
|
return data.vblocks().v;
|
|
}));
|
|
writePadding();
|
|
writeDigest();
|
|
writeTimestamp();
|
|
}
|
|
|
|
ClientHello ClientHelloGenerator::result() {
|
|
return {
|
|
_error ? QByteArray() : std::move(_result),
|
|
_error ? QByteArray() : std::move(_digest) };
|
|
}
|
|
|
|
bytes::span ClientHelloGenerator::grow(int size) {
|
|
if (_error
|
|
|| size <= 0
|
|
|| _result.size() + size > kClientHelloLength) {
|
|
_error = true;
|
|
return bytes::span();
|
|
}
|
|
|
|
const auto offset = _result.size();
|
|
_result.resize(offset + size);
|
|
return bytes::make_detached_span(_result).subspan(offset);
|
|
}
|
|
|
|
void ClientHelloGenerator::writeBlocks(const QVector<MTPTlsBlock> &blocks) {
|
|
for (const auto &block : blocks) {
|
|
writeBlock(block);
|
|
}
|
|
}
|
|
|
|
void ClientHelloGenerator::writeBlock(const MTPTlsBlock &data) {
|
|
data.match([&](const auto &data) {
|
|
writeBlock(data);
|
|
});
|
|
}
|
|
|
|
void ClientHelloGenerator::writeBlock(const MTPDtlsBlockString &data) {
|
|
const auto &bytes = data.vdata().v;
|
|
const auto storage = grow(bytes.size());
|
|
if (storage.empty()) {
|
|
return;
|
|
}
|
|
bytes::copy(storage, bytes::make_span(bytes));
|
|
}
|
|
|
|
void ClientHelloGenerator::writeBlock(const MTPDtlsBlockZero &data) {
|
|
const auto length = data.vlength().v;
|
|
const auto already = _result.size();
|
|
const auto storage = grow(length);
|
|
if (storage.empty()) {
|
|
return;
|
|
}
|
|
if (length == kHelloDigestLength && _digestPosition < 0) {
|
|
_digestPosition = already;
|
|
}
|
|
bytes::set_with_const(storage, bytes::type(0));
|
|
}
|
|
|
|
void ClientHelloGenerator::writeBlock(const MTPDtlsBlockGrease &data) {
|
|
const auto seed = data.vseed().v;
|
|
if (seed < 0 || seed >= _greases.size()) {
|
|
_error = true;
|
|
return;
|
|
}
|
|
const auto storage = grow(2);
|
|
if (storage.empty()) {
|
|
return;
|
|
}
|
|
bytes::set_with_const(storage, _greases[seed]);
|
|
}
|
|
|
|
void ClientHelloGenerator::writeBlock(const MTPDtlsBlockRandom &data) {
|
|
const auto length = data.vlength().v;
|
|
const auto storage = grow(length);
|
|
if (storage.empty()) {
|
|
return;
|
|
}
|
|
bytes::set_random(storage);
|
|
}
|
|
|
|
void ClientHelloGenerator::writeBlock(const MTPDtlsBlockDomain &data) {
|
|
const auto storage = grow(_domain.size());
|
|
if (storage.empty()) {
|
|
return;
|
|
}
|
|
bytes::copy(storage, _domain);
|
|
}
|
|
|
|
void ClientHelloGenerator::writeBlock(const MTPDtlsBlockPublicKey &data) {
|
|
const auto key = GeneratePublicKey();
|
|
const auto storage = grow(key.size());
|
|
if (storage.empty()) {
|
|
return;
|
|
}
|
|
bytes::copy(storage, key);
|
|
}
|
|
|
|
void ClientHelloGenerator::writeBlock(const MTPDtlsBlockScope &data) {
|
|
const auto storage = grow(kLengthSize);
|
|
if (storage.empty()) {
|
|
return;
|
|
}
|
|
const auto already = _result.size();
|
|
writeBlocks(data.ventries().v);
|
|
const auto length = qToBigEndian(uint16(_result.size() - already));
|
|
bytes::copy(storage, bytes::object_as_span(&length));
|
|
}
|
|
|
|
void ClientHelloGenerator::writePadding() {
|
|
const auto padding = kClientHelloLength - kLengthSize - _result.size();
|
|
writeBlock(MTP_tlsBlockScope(
|
|
MTP_vector<MTPTlsBlock>(1, MTP_tlsBlockZero(MTP_int(padding)))));
|
|
}
|
|
|
|
void ClientHelloGenerator::writeDigest() {
|
|
if (_digestPosition < 0) {
|
|
_error = true;
|
|
return;
|
|
}
|
|
bytes::copy(
|
|
bytes::make_detached_span(_result).subspan(_digestPosition),
|
|
openssl::HmacSha256(_key, bytes::make_span(_result)));
|
|
}
|
|
|
|
void ClientHelloGenerator::writeTimestamp() {
|
|
if (_digestPosition < 0) {
|
|
_error = true;
|
|
return;
|
|
}
|
|
const auto storage = bytes::make_detached_span(_result).subspan(
|
|
_digestPosition + kHelloDigestLength - sizeof(int32),
|
|
sizeof(int32));
|
|
auto already = int32();
|
|
bytes::copy(bytes::object_as_span(&already), storage);
|
|
already ^= qToLittleEndian(int32(base::unixtime::http_now()));
|
|
bytes::copy(storage, bytes::object_as_span(&already));
|
|
|
|
_digest = QByteArray(kHelloDigestLength, Qt::Uninitialized);
|
|
bytes::copy(
|
|
bytes::make_detached_span(_digest),
|
|
bytes::make_detached_span(_result).subspan(
|
|
_digestPosition,
|
|
kHelloDigestLength));
|
|
}
|
|
|
|
[[nodiscard]] ClientHello PrepareClientHello(
|
|
const MTPTlsClientHello &rules,
|
|
bytes::const_span domain,
|
|
bytes::const_span key) {
|
|
return ClientHelloGenerator(rules, domain, key).result();
|
|
}
|
|
|
|
[[nodiscard]] bool CheckPart(bytes::const_span data, QLatin1String check) {
|
|
if (data.size() < check.size()) {
|
|
return false;
|
|
}
|
|
return !bytes::compare(
|
|
data.subspan(0, check.size()),
|
|
bytes::make_span(check.data(), check.size()));
|
|
}
|
|
|
|
[[nodiscard]] int ReadPartLength(bytes::const_span data, int offset) {
|
|
const auto storage = data.subspan(offset, kLengthSize);
|
|
return qFromBigEndian(
|
|
*reinterpret_cast<const uint16*>(storage.data()));
|
|
}
|
|
|
|
} // namespace
|
|
|
|
TlsSocket::TlsSocket(
|
|
not_null<QThread*> thread,
|
|
const bytes::vector &secret,
|
|
const QNetworkProxy &proxy,
|
|
bool protocolForFiles)
|
|
: AbstractSocket(thread)
|
|
, _secret(secret) {
|
|
Expects(_secret.size() >= 21 && _secret[0] == bytes::type(0xEE));
|
|
|
|
_socket.moveToThread(thread);
|
|
_socket.setProxy(proxy);
|
|
if (protocolForFiles) {
|
|
_socket.setSocketOption(
|
|
QAbstractSocket::SendBufferSizeSocketOption,
|
|
kFilesSendBufferSize);
|
|
_socket.setSocketOption(
|
|
QAbstractSocket::ReceiveBufferSizeSocketOption,
|
|
kFilesReceiveBufferSize);
|
|
}
|
|
const auto wrap = [&](auto handler) {
|
|
return [=](auto &&...args) {
|
|
InvokeQueued(this, [=] { handler(args...); });
|
|
};
|
|
};
|
|
using Error = QAbstractSocket::SocketError;
|
|
connect(
|
|
&_socket,
|
|
&QTcpSocket::connected,
|
|
wrap([=] { plainConnected(); }));
|
|
connect(
|
|
&_socket,
|
|
&QTcpSocket::disconnected,
|
|
wrap([=] { plainDisconnected(); }));
|
|
connect(
|
|
&_socket,
|
|
&QTcpSocket::readyRead,
|
|
wrap([=] { plainReadyRead(); }));
|
|
connect(
|
|
&_socket,
|
|
base::QTcpSocket_error,
|
|
wrap([=](Error e) { handleError(e); }));
|
|
}
|
|
|
|
bytes::const_span TlsSocket::domainFromSecret() const {
|
|
return bytes::make_span(_secret).subspan(17);
|
|
}
|
|
|
|
bytes::const_span TlsSocket::keyFromSecret() const {
|
|
return bytes::make_span(_secret).subspan(1, 16);
|
|
}
|
|
|
|
void TlsSocket::plainConnected() {
|
|
if (_state != State::Connecting) {
|
|
return;
|
|
}
|
|
|
|
static const auto kClientHelloRules = PrepareClientHelloRules();
|
|
const auto hello = PrepareClientHello(
|
|
kClientHelloRules,
|
|
domainFromSecret(),
|
|
keyFromSecret());
|
|
if (hello.data.isEmpty()) {
|
|
LOG(("TLS Error: Could not generate Client Hello!"));
|
|
_state = State::Error;
|
|
_error.fire({});
|
|
} else {
|
|
_state = State::WaitingHello;
|
|
_incoming = hello.digest;
|
|
_socket.write(hello.data);
|
|
}
|
|
}
|
|
|
|
void TlsSocket::plainDisconnected() {
|
|
_state = State::NotConnected;
|
|
_incoming = QByteArray();
|
|
_serverHelloLength = 0;
|
|
_incomingGoodDataOffset = 0;
|
|
_incomingGoodDataLimit = 0;
|
|
_disconnected.fire({});
|
|
}
|
|
|
|
void TlsSocket::plainReadyRead() {
|
|
switch (_state) {
|
|
case State::WaitingHello: return readHello();
|
|
case State::Connected: return readData();
|
|
}
|
|
}
|
|
|
|
bool TlsSocket::requiredHelloPartReady() const {
|
|
return _incoming.size() >= kHelloDigestLength + _serverHelloLength;
|
|
}
|
|
|
|
void TlsSocket::readHello() {
|
|
const auto parts1Size = kServerHelloPart1.size() + kLengthSize;
|
|
if (!_serverHelloLength) {
|
|
_serverHelloLength = parts1Size;
|
|
}
|
|
while (!requiredHelloPartReady()) {
|
|
if (!_socket.bytesAvailable()) {
|
|
return;
|
|
}
|
|
_incoming.append(_socket.readAll());
|
|
}
|
|
checkHelloParts12(parts1Size);
|
|
}
|
|
|
|
void TlsSocket::checkHelloParts12(int parts1Size) {
|
|
const auto data = bytes::make_span(_incoming).subspan(
|
|
kHelloDigestLength,
|
|
parts1Size);
|
|
const auto part2Size = ReadPartLength(data, parts1Size - kLengthSize);
|
|
const auto parts123Size = parts1Size
|
|
+ part2Size
|
|
+ kServerHelloPart3.size()
|
|
+ kLengthSize;
|
|
if (_serverHelloLength == parts1Size) {
|
|
const auto part1Offset = parts1Size
|
|
- kLengthSize
|
|
- kServerHelloPart1.size();
|
|
if (!CheckPart(data.subspan(part1Offset), kServerHelloPart1)) {
|
|
LOG(("TLS Error: Bad Server Hello part1."));
|
|
handleError();
|
|
return;
|
|
}
|
|
_serverHelloLength = parts123Size;
|
|
if (!requiredHelloPartReady()) {
|
|
readHello();
|
|
return;
|
|
}
|
|
}
|
|
checkHelloParts34(parts123Size);
|
|
}
|
|
|
|
void TlsSocket::checkHelloParts34(int parts123Size) {
|
|
const auto data = bytes::make_span(_incoming).subspan(
|
|
kHelloDigestLength,
|
|
parts123Size);
|
|
const auto part4Size = ReadPartLength(data, parts123Size - kLengthSize);
|
|
const auto full = parts123Size + part4Size;
|
|
if (_serverHelloLength == parts123Size) {
|
|
const auto part3Offset = parts123Size
|
|
- kLengthSize
|
|
- kServerHelloPart3.size();
|
|
if (!CheckPart(data.subspan(part3Offset), kServerHelloPart3)) {
|
|
LOG(("TLS Error: Bad Server Hello part."));
|
|
handleError();
|
|
return;
|
|
}
|
|
_serverHelloLength = full;
|
|
if (!requiredHelloPartReady()) {
|
|
readHello();
|
|
return;
|
|
}
|
|
}
|
|
checkHelloDigest();
|
|
}
|
|
|
|
void TlsSocket::checkHelloDigest() {
|
|
const auto fulldata = bytes::make_detached_span(_incoming).subspan(
|
|
0,
|
|
kHelloDigestLength + _serverHelloLength);
|
|
const auto digest = fulldata.subspan(
|
|
kHelloDigestLength + kServerHelloDigestPosition,
|
|
kHelloDigestLength);
|
|
const auto digestCopy = bytes::make_vector(digest);
|
|
bytes::set_with_const(digest, bytes::type(0));
|
|
const auto check = openssl::HmacSha256(keyFromSecret(), fulldata);
|
|
if (bytes::compare(digestCopy, check) != 0) {
|
|
LOG(("TLS Error: Bad Server Hello digest."));
|
|
handleError();
|
|
return;
|
|
}
|
|
shiftIncomingBy(fulldata.size());
|
|
if (!_incoming.isEmpty()) {
|
|
InvokeQueued(this, [=] {
|
|
if (!checkNextPacket()) {
|
|
handleError();
|
|
}
|
|
});
|
|
}
|
|
_incomingGoodDataOffset = _incomingGoodDataLimit = 0;
|
|
_state = State::Connected;
|
|
_connected.fire({});
|
|
}
|
|
|
|
void TlsSocket::readData() {
|
|
if (!isConnected()) {
|
|
return;
|
|
}
|
|
_incoming.append(_socket.readAll());
|
|
if (!checkNextPacket()) {
|
|
handleError();
|
|
} else if (hasBytesAvailable()) {
|
|
_readyRead.fire({});
|
|
}
|
|
}
|
|
|
|
bool TlsSocket::checkNextPacket() {
|
|
auto offset = 0;
|
|
const auto incoming = bytes::make_span(_incoming);
|
|
while (!_incomingGoodDataLimit) {
|
|
const auto fullHeader = kServerHeader.size() + kLengthSize;
|
|
if (incoming.size() <= offset + fullHeader) {
|
|
return true;
|
|
}
|
|
if (!CheckPart(incoming.subspan(offset), kServerHeader)) {
|
|
LOG(("TLS Error: Bad packet header."));
|
|
return false;
|
|
}
|
|
const auto length = ReadPartLength(
|
|
incoming,
|
|
offset + kServerHeader.size());
|
|
if (length > 0) {
|
|
if (offset > 0) {
|
|
shiftIncomingBy(offset);
|
|
}
|
|
_incomingGoodDataOffset = fullHeader;
|
|
_incomingGoodDataLimit = length;
|
|
} else {
|
|
offset += kServerHeader.size() + kLengthSize + length;
|
|
}
|
|
}
|
|
return true;
|
|
}
|
|
|
|
void TlsSocket::shiftIncomingBy(int amount) {
|
|
Expects(_incomingGoodDataOffset == 0);
|
|
Expects(_incomingGoodDataLimit == 0);
|
|
|
|
const auto incoming = bytes::make_detached_span(_incoming);
|
|
if (incoming.size() > amount) {
|
|
bytes::move(incoming, incoming.subspan(amount));
|
|
_incoming.chop(amount);
|
|
} else {
|
|
_incoming.clear();
|
|
}
|
|
}
|
|
|
|
void TlsSocket::connectToHost(const QString &address, int port) {
|
|
Expects(_state == State::NotConnected);
|
|
|
|
_state = State::Connecting;
|
|
_socket.connectToHost(address, port);
|
|
}
|
|
|
|
bool TlsSocket::isGoodStartNonce(bytes::const_span nonce) {
|
|
return true;
|
|
}
|
|
|
|
void TlsSocket::timedOut() {
|
|
_syncTimeRequests.fire({});
|
|
}
|
|
|
|
bool TlsSocket::isConnected() {
|
|
return (_state == State::Connected);
|
|
}
|
|
|
|
bool TlsSocket::hasBytesAvailable() {
|
|
return (_incomingGoodDataLimit > 0)
|
|
&& (_incomingGoodDataOffset < _incoming.size());
|
|
}
|
|
|
|
int64 TlsSocket::read(bytes::span buffer) {
|
|
auto written = int64(0);
|
|
while (_incomingGoodDataLimit) {
|
|
const auto available = std::min(
|
|
_incomingGoodDataLimit,
|
|
int(_incoming.size()) - _incomingGoodDataOffset);
|
|
if (available <= 0) {
|
|
return written;
|
|
}
|
|
const auto write = std::min(std::size_t(available), buffer.size());
|
|
if (write <= 0) {
|
|
return written;
|
|
}
|
|
bytes::copy(
|
|
buffer,
|
|
bytes::make_span(_incoming).subspan(
|
|
_incomingGoodDataOffset,
|
|
write));
|
|
written += write;
|
|
buffer = buffer.subspan(write);
|
|
_incomingGoodDataLimit -= write;
|
|
_incomingGoodDataOffset += write;
|
|
if (_incomingGoodDataLimit) {
|
|
return written;
|
|
}
|
|
shiftIncomingBy(base::take(_incomingGoodDataOffset));
|
|
if (!checkNextPacket()) {
|
|
_state = State::Error;
|
|
InvokeQueued(this, [=] { handleError(); });
|
|
return written;
|
|
}
|
|
}
|
|
return written;
|
|
}
|
|
|
|
void TlsSocket::write(bytes::const_span prefix, bytes::const_span buffer) {
|
|
Expects(!buffer.empty());
|
|
|
|
if (!isConnected()) {
|
|
return;
|
|
}
|
|
if (!prefix.empty()) {
|
|
_socket.write(kClientPrefix.data(), kClientPrefix.size());
|
|
}
|
|
while (!buffer.empty()) {
|
|
const auto write = std::min(
|
|
kClientPartSize - prefix.size(),
|
|
buffer.size());
|
|
_socket.write(kClientHeader.data(), kClientHeader.size());
|
|
const auto size = qToBigEndian(uint16(prefix.size() + write));
|
|
_socket.write(reinterpret_cast<const char*>(&size), sizeof(size));
|
|
if (!prefix.empty()) {
|
|
_socket.write(
|
|
reinterpret_cast<const char*>(prefix.data()),
|
|
prefix.size());
|
|
prefix = bytes::const_span();
|
|
}
|
|
_socket.write(
|
|
reinterpret_cast<const char*>(buffer.data()),
|
|
write);
|
|
buffer = buffer.subspan(write);
|
|
}
|
|
}
|
|
|
|
int32 TlsSocket::debugState() {
|
|
return _socket.state();
|
|
}
|
|
|
|
void TlsSocket::handleError(int errorCode) {
|
|
if (_state != State::Connected) {
|
|
_syncTimeRequests.fire({});
|
|
}
|
|
if (errorCode) {
|
|
TcpSocket::LogError(errorCode, _socket.errorString());
|
|
}
|
|
_state = State::Error;
|
|
_error.fire({});
|
|
}
|
|
|
|
} // namespace MTP::details
|