551 lines
16 KiB
C++
551 lines
16 KiB
C++
/*
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This file is part of Telegram Desktop,
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the official desktop application for the Telegram messaging service.
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For license and copyright information please follow this link:
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https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
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*/
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#include "mtproto/special_config_request.h"
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#include "mtproto/details/mtproto_rsa_public_key.h"
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#include "mtproto/mtproto_dc_options.h"
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#include "mtproto/mtproto_auth_key.h"
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#include "base/unixtime.h"
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#include "base/openssl_help.h"
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#include "base/call_delayed.h"
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#include <QtCore/QJsonDocument>
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#include <QtCore/QJsonArray>
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#include <QtCore/QJsonObject>
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namespace MTP::details {
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namespace {
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constexpr auto kSendNextTimeout = crl::time(800);
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constexpr auto kPublicKey = "\
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-----BEGIN RSA PUBLIC KEY-----\n\
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MIIBCgKCAQEAyr+18Rex2ohtVy8sroGPBwXD3DOoKCSpjDqYoXgCqB7ioln4eDCF\n\
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fOBUlfXUEvM/fnKCpF46VkAftlb4VuPDeQSS/ZxZYEGqHaywlroVnXHIjgqoxiAd\n\
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192xRGreuXIaUKmkwlM9JID9WS2jUsTpzQ91L8MEPLJ/4zrBwZua8W5fECwCCh2c\n\
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9G5IzzBm+otMS/YKwmR1olzRCyEkyAEjXWqBI9Ftv5eG8m0VkBzOG655WIYdyV0H\n\
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fDK/NWcvGqa0w/nriMD6mDjKOryamw0OP9QuYgMN0C9xMW9y8SmP4h92OAWodTYg\n\
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Y1hZCxdv6cs5UnW9+PWvS+WIbkh+GaWYxwIDAQAB\n\
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-----END RSA PUBLIC KEY-----\
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"_cs;
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const auto kRemoteProject = "peak-vista-421";
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const auto kFireProject = "reserve-5a846";
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const auto kConfigKey = "ipconfig";
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const auto kConfigSubKey = "v3";
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const auto kApiKey = "AIzaSyC2-kAkpDsroixRXw-sTw-Wfqo4NxjMwwM";
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const auto kAppId = "1:560508485281:web:4ee13a6af4e84d49e67ae0";
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QString ApiDomain(const QString &service) {
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return service + ".googleapis.com";
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}
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QString GenerateInstanceId() {
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auto fid = bytes::array<17>();
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bytes::set_random(fid);
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fid[0] = (bytes::type(0xF0) & fid[0]) | bytes::type(0x07);
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return QString::fromLatin1(
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QByteArray::fromRawData(
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reinterpret_cast<const char*>(fid.data()),
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fid.size()
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).toBase64(QByteArray::Base64UrlEncoding).mid(0, 22));
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}
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QString InstanceId() {
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static const auto result = GenerateInstanceId();
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return result;
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}
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bool CheckPhoneByPrefixesRules(const QString &phone, const QString &rules) {
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const auto check = QString(phone).replace(
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QRegularExpression("[^0-9]"),
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QString());
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auto result = false;
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for (const auto &prefix : rules.split(',')) {
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if (prefix.isEmpty()) {
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result = true;
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} else if (prefix[0] == '+' && check.startsWith(prefix.mid(1))) {
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result = true;
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} else if (prefix[0] == '-' && check.startsWith(prefix.mid(1))) {
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return false;
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}
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}
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return result;
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}
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QByteArray ConcatenateDnsTxtFields(const std::vector<DnsEntry> &response) {
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auto entries = QMultiMap<int, QString>();
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for (const auto &entry : response) {
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entries.insert(INT_MAX - entry.data.size(), entry.data);
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}
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return QStringList(entries.values()).join(QString()).toLatin1();
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}
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QByteArray ParseRemoteConfigResponse(const QByteArray &bytes) {
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auto error = QJsonParseError{ 0, QJsonParseError::NoError };
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const auto document = QJsonDocument::fromJson(bytes, &error);
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if (error.error != QJsonParseError::NoError) {
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LOG(("Config Error: Failed to parse fire response JSON, error: %1"
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).arg(error.errorString()));
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return {};
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} else if (!document.isObject()) {
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LOG(("Config Error: Not an object received in fire response JSON."));
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return {};
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}
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return document.object().value(
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"entries"
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).toObject().value(
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u"%1%2"_q.arg(kConfigKey, kConfigSubKey)
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).toString().toLatin1();
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}
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QByteArray ParseFireStoreResponse(const QByteArray &bytes) {
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auto error = QJsonParseError{ 0, QJsonParseError::NoError };
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const auto document = QJsonDocument::fromJson(bytes, &error);
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if (error.error != QJsonParseError::NoError) {
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LOG(("Config Error: Failed to parse fire response JSON, error: %1"
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).arg(error.errorString()));
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return {};
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} else if (!document.isObject()) {
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LOG(("Config Error: Not an object received in fire response JSON."));
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return {};
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}
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return document.object().value(
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"fields"
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).toObject().value(
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"data"
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).toObject().value(
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"stringValue"
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).toString().toLatin1();
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}
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QByteArray ParseRealtimeResponse(const QByteArray &bytes) {
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if (bytes.size() < 2
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|| bytes[0] != '"'
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|| bytes[bytes.size() - 1] != '"') {
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return QByteArray();
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}
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return bytes.mid(1, bytes.size() - 2);
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}
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[[nodiscard]] QDateTime ParseHttpDate(const QString &date) {
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// Wed, 10 Jul 2019 14:33:38 GMT
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static const auto expression = QRegularExpression(
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R"(\w\w\w, (\d\d) (\w\w\w) (\d\d\d\d) (\d\d):(\d\d):(\d\d) GMT)");
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const auto match = expression.match(date);
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if (!match.hasMatch()) {
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return QDateTime();
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}
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const auto number = [&](int index) {
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return match.capturedView(index).toInt();
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};
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const auto day = number(1);
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const auto month = [&] {
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static const auto months = {
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"Jan",
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"Feb",
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"Mar",
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"Apr",
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"May",
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"Jun",
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"Jul",
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"Aug",
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"Sep",
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"Oct",
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"Nov",
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"Dec"
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};
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const auto captured = match.capturedView(2);
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for (auto i = begin(months); i != end(months); ++i) {
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if (captured == QString(*i)) {
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return 1 + int(i - begin(months));
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}
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}
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return 0;
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}();
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const auto year = number(3);
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const auto hour = number(4);
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const auto minute = number(5);
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const auto second = number(6);
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return QDateTime(
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QDate(year, month, day),
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QTime(hour, minute, second),
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Qt::UTC);
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}
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} // namespace
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SpecialConfigRequest::SpecialConfigRequest(
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Fn<void(
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DcId dcId,
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const std::string &ip,
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int port,
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bytes::const_span secret)> callback,
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Fn<void()> timeDoneCallback,
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bool isTestMode,
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const QString &domainString,
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const QString &phone)
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: _callback(std::move(callback))
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, _timeDoneCallback(std::move(timeDoneCallback))
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, _domainString(domainString)
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, _phone(phone) {
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Expects((_callback == nullptr) != (_timeDoneCallback == nullptr));
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_manager.setProxy(QNetworkProxy::NoProxy);
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std::random_device rd;
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const auto shuffle = [&](int from, int till) {
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Expects(till > from);
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ranges::shuffle(
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begin(_attempts) + from,
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begin(_attempts) + till,
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std::mt19937(rd()));
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};
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_attempts = {};
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_attempts.push_back({ Type::Google, "dns.google.com" });
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_attempts.push_back({ Type::Mozilla, "mozilla.cloudflare-dns.com" });
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_attempts.push_back({ Type::RemoteConfig, "firebaseremoteconfig" });
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if (!_timeDoneCallback) {
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_attempts.push_back({ Type::FireStore, "firestore" });
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for (const auto &domain : DnsDomains()) {
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_attempts.push_back({ Type::FireStore, domain, "firestore" });
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}
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}
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shuffle(0, 2);
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if (!_timeDoneCallback) {
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shuffle(_attempts.size() - (int(DnsDomains().size()) + 1), _attempts.size());
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}
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if (isTestMode) {
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_attempts.erase(ranges::remove_if(_attempts, [](
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const Attempt &attempt) {
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return (attempt.type != Type::Google)
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&& (attempt.type != Type::Mozilla);
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}), _attempts.end());
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}
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ranges::reverse(_attempts); // We go from last to first.
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sendNextRequest();
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}
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SpecialConfigRequest::SpecialConfigRequest(
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Fn<void(
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DcId dcId,
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const std::string &ip,
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int port,
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bytes::const_span secret)> callback,
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bool isTestMode,
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const QString &domainString,
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const QString &phone)
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: SpecialConfigRequest(
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std::move(callback),
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nullptr,
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isTestMode,
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domainString,
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phone) {
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}
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SpecialConfigRequest::SpecialConfigRequest(
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Fn<void()> timeDoneCallback,
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bool isTestMode,
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const QString &domainString)
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: SpecialConfigRequest(
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nullptr,
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std::move(timeDoneCallback),
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isTestMode,
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domainString,
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QString()) {
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}
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void SpecialConfigRequest::sendNextRequest() {
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Expects(!_attempts.empty());
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const auto attempt = _attempts.back();
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_attempts.pop_back();
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if (!_attempts.empty()) {
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base::call_delayed(kSendNextTimeout, this, [=] {
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sendNextRequest();
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});
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}
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performRequest(attempt);
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}
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void SpecialConfigRequest::performRequest(const Attempt &attempt) {
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const auto type = attempt.type;
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auto url = QUrl();
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url.setScheme(u"https"_q);
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auto request = QNetworkRequest();
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auto payload = QByteArray();
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switch (type) {
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case Type::Mozilla: {
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url.setHost(attempt.data);
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url.setPath(u"/dns-query"_q);
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url.setQuery(u"name=%1&type=16&random_padding=%2"_q.arg(
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_domainString,
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GenerateDnsRandomPadding()));
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request.setRawHeader("accept", "application/dns-json");
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} break;
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case Type::Google: {
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url.setHost(attempt.data);
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url.setPath(u"/resolve"_q);
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url.setQuery(u"name=%1&type=ANY&random_padding=%2"_q.arg(
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_domainString,
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GenerateDnsRandomPadding()));
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if (!attempt.host.isEmpty()) {
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const auto host = attempt.host + ".google.com";
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request.setRawHeader("Host", host.toLatin1());
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}
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} break;
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case Type::RemoteConfig: {
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url.setHost(ApiDomain(attempt.data));
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url.setPath((u"/v1/projects/%1/namespaces/firebase:fetch"_q
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).arg(kRemoteProject));
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url.setQuery(u"key=%1"_q.arg(kApiKey));
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payload = u"{\"app_id\":\"%1\",\"app_instance_id\":\"%2\"}"_q.arg(
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kAppId,
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InstanceId()).toLatin1();
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request.setRawHeader("Content-Type", "application/json");
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} break;
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case Type::Realtime: {
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url.setHost(kFireProject + u".%1"_q.arg(attempt.data));
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url.setPath(u"/%1%2.json"_q.arg(kConfigKey, kConfigSubKey));
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} break;
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case Type::FireStore: {
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url.setHost(attempt.host.isEmpty()
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? ApiDomain(attempt.data)
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: attempt.data);
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url.setPath((u"/v1/projects/%1/databases/(default)/documents/%2/%3"_q
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).arg(
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kFireProject,
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kConfigKey,
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kConfigSubKey));
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if (!attempt.host.isEmpty()) {
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const auto host = ApiDomain(attempt.host);
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request.setRawHeader("Host", host.toLatin1());
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}
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} break;
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default: Unexpected("Type in SpecialConfigRequest::performRequest.");
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}
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request.setUrl(url);
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request.setRawHeader("User-Agent", DnsUserAgent());
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const auto reply = _requests.emplace_back(payload.isEmpty()
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? _manager.get(request)
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: _manager.post(request, payload)
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).reply;
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connect(reply, &QNetworkReply::finished, this, [=] {
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requestFinished(type, reply);
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});
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}
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void SpecialConfigRequest::handleHeaderUnixtime(
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not_null<QNetworkReply*> reply) {
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if (reply->error() != QNetworkReply::NoError) {
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return;
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}
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const auto date = QString::fromLatin1([&] {
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for (const auto &pair : reply->rawHeaderPairs()) {
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if (pair.first == "Date") {
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return pair.second;
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}
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}
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return QByteArray();
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}());
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if (date.isEmpty()) {
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LOG(("Config Error: No 'Date' header received."));
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return;
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}
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const auto parsed = ParseHttpDate(date);
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if (!parsed.isValid()) {
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LOG(("Config Error: Bad 'Date' header received: %1").arg(date));
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return;
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}
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base::unixtime::http_update(parsed.toSecsSinceEpoch());
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if (_timeDoneCallback) {
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_timeDoneCallback();
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}
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}
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void SpecialConfigRequest::requestFinished(
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Type type,
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not_null<QNetworkReply*> reply) {
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handleHeaderUnixtime(reply);
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const auto result = finalizeRequest(reply);
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if (!_callback || result.isEmpty()) {
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return;
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}
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switch (type) {
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case Type::Mozilla:
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case Type::Google: {
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constexpr auto kTypeRestriction = 16; // TXT
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handleResponse(ConcatenateDnsTxtFields(
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ParseDnsResponse(result, kTypeRestriction)));
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} break;
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case Type::RemoteConfig: {
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handleResponse(ParseRemoteConfigResponse(result));
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} break;
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case Type::Realtime: {
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handleResponse(ParseRealtimeResponse(result));
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} break;
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case Type::FireStore: {
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handleResponse(ParseFireStoreResponse(result));
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} break;
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default: Unexpected("Type in SpecialConfigRequest::requestFinished.");
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}
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}
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QByteArray SpecialConfigRequest::finalizeRequest(
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not_null<QNetworkReply*> reply) {
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if (reply->error() != QNetworkReply::NoError) {
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DEBUG_LOG(("Config Error: Failed to get response, error: %2 (%3)"
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).arg(reply->errorString()
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).arg(reply->error()));
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}
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const auto result = reply->readAll();
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const auto from = ranges::remove(
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_requests,
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reply,
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[](const ServiceWebRequest &request) { return request.reply; });
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_requests.erase(from, end(_requests));
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return result;
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}
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bool SpecialConfigRequest::decryptSimpleConfig(const QByteArray &bytes) {
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auto cleanBytes = bytes;
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auto removeFrom = std::remove_if(cleanBytes.begin(), cleanBytes.end(), [](char ch) {
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auto isGoodBase64 = (ch == '+') || (ch == '=') || (ch == '/')
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|| (ch >= 'a' && ch <= 'z')
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|| (ch >= 'A' && ch <= 'Z')
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|| (ch >= '0' && ch <= '9');
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return !isGoodBase64;
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});
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if (removeFrom != cleanBytes.end()) {
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cleanBytes.remove(removeFrom - cleanBytes.begin(), cleanBytes.end() - removeFrom);
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}
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constexpr auto kGoodSizeBase64 = 344;
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if (cleanBytes.size() != kGoodSizeBase64) {
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LOG(("Config Error: Bad data size %1 required %2").arg(cleanBytes.size()).arg(kGoodSizeBase64));
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return false;
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}
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constexpr auto kGoodSizeData = 256;
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auto decodedBytes = QByteArray::fromBase64(cleanBytes, QByteArray::Base64Encoding);
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if (decodedBytes.size() != kGoodSizeData) {
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LOG(("Config Error: Bad data size %1 required %2").arg(decodedBytes.size()).arg(kGoodSizeData));
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return false;
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}
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auto publicKey = details::RSAPublicKey(bytes::make_span(kPublicKey));
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auto decrypted = publicKey.decrypt(bytes::make_span(decodedBytes));
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auto decryptedBytes = gsl::make_span(decrypted);
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auto aesEncryptedBytes = decryptedBytes.subspan(CTRState::KeySize);
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auto aesivec = bytes::make_vector(decryptedBytes.subspan(CTRState::KeySize - CTRState::IvecSize, CTRState::IvecSize));
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AES_KEY aeskey;
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AES_set_decrypt_key(reinterpret_cast<const unsigned char*>(decryptedBytes.data()), CTRState::KeySize * CHAR_BIT, &aeskey);
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AES_cbc_encrypt(reinterpret_cast<const unsigned char*>(aesEncryptedBytes.data()), reinterpret_cast<unsigned char*>(aesEncryptedBytes.data()), aesEncryptedBytes.size(), &aeskey, reinterpret_cast<unsigned char*>(aesivec.data()), AES_DECRYPT);
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constexpr auto kDigestSize = 16;
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auto dataSize = aesEncryptedBytes.size() - kDigestSize;
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auto data = aesEncryptedBytes.subspan(0, dataSize);
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auto hash = openssl::Sha256(data);
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if (bytes::compare(gsl::make_span(hash).subspan(0, kDigestSize), aesEncryptedBytes.subspan(dataSize)) != 0) {
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LOG(("Config Error: Bad digest."));
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return false;
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}
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mtpBuffer buffer;
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buffer.resize(data.size() / sizeof(mtpPrime));
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bytes::copy(bytes::make_span(buffer), data);
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auto from = &*buffer.cbegin();
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auto end = from + buffer.size();
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auto realLength = *from++;
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if (realLength <= 0 || realLength > dataSize || (realLength & 0x03)) {
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LOG(("Config Error: Bad length %1.").arg(realLength));
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return false;
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}
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if (!_simpleConfig.read(from, end)) {
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LOG(("Config Error: Could not read configSimple."));
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return false;
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}
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if ((end - from) * sizeof(mtpPrime) != (dataSize - realLength)) {
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LOG(("Config Error: Bad read length %1, should be %2.").arg((end - from) * sizeof(mtpPrime)).arg(dataSize - realLength));
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return false;
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}
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return true;
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}
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|
|
void SpecialConfigRequest::handleResponse(const QByteArray &bytes) {
|
|
if (!decryptSimpleConfig(bytes)) {
|
|
return;
|
|
}
|
|
Assert(_simpleConfig.type() == mtpc_help_configSimple);
|
|
const auto &config = _simpleConfig.c_help_configSimple();
|
|
const auto now = base::unixtime::http_now();
|
|
if (now > config.vexpires().v) {
|
|
LOG(("Config Error: "
|
|
"Bad date frame for simple config: %1-%2, our time is %3."
|
|
).arg(config.vdate().v
|
|
).arg(config.vexpires().v
|
|
).arg(now));
|
|
return;
|
|
}
|
|
if (config.vrules().v.empty()) {
|
|
LOG(("Config Error: Empty simple config received."));
|
|
return;
|
|
}
|
|
for (const auto &rule : config.vrules().v) {
|
|
Assert(rule.type() == mtpc_accessPointRule);
|
|
const auto &data = rule.c_accessPointRule();
|
|
const auto phoneRules = qs(data.vphone_prefix_rules());
|
|
if (!CheckPhoneByPrefixesRules(_phone, phoneRules)) {
|
|
continue;
|
|
}
|
|
|
|
const auto dcId = data.vdc_id().v;
|
|
for (const auto &address : data.vips().v) {
|
|
const auto parseIp = [](const MTPint &ipv4) {
|
|
const auto ip = *reinterpret_cast<const uint32*>(&ipv4.v);
|
|
return (u"%1.%2.%3.%4"_q
|
|
).arg((ip >> 24) & 0xFF
|
|
).arg((ip >> 16) & 0xFF
|
|
).arg((ip >> 8) & 0xFF
|
|
).arg(ip & 0xFF).toStdString();
|
|
};
|
|
switch (address.type()) {
|
|
case mtpc_ipPort: {
|
|
const auto &fields = address.c_ipPort();
|
|
const auto ip = parseIp(fields.vipv4());
|
|
if (!ip.empty()) {
|
|
_callback(dcId, ip, fields.vport().v, {});
|
|
}
|
|
} break;
|
|
case mtpc_ipPortSecret: {
|
|
const auto &fields = address.c_ipPortSecret();
|
|
const auto ip = parseIp(fields.vipv4());
|
|
if (!ip.empty()) {
|
|
_callback(
|
|
dcId,
|
|
ip,
|
|
fields.vport().v,
|
|
bytes::make_span(fields.vsecret().v));
|
|
}
|
|
} break;
|
|
default: Unexpected("Type in simpleConfig ips.");
|
|
}
|
|
}
|
|
}
|
|
_callback(0, std::string(), 0, {});
|
|
}
|
|
|
|
} // namespace MTP::details
|