Support base64 encoding of the secret.

Telegram/Resources/langs/lang.strings

@@ -145,6 +145,8 @@ https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
 "lng_sure_ban_admin" = "This user is an admin. Are you sure you want to go ahead and restrict them?";
 "lng_sure_enable_socks" = "Are you sure you want to enable this proxy?\n\nServer: {server}\nPort: {port}\n\nYou can change your proxy server later in the Settings (Connection Type).";
 "lng_sure_enable" = "Enable";
+"lng_proxy_invalid" = "The proxy link is invalid.";
+"lng_proxy_unsupported" = "Your Telegram Desktop version doesn't support this proxy type or the proxy link is invalid. Please update Telegram Desktop to the latest version.";
 
 "lng_edit_deleted" = "This message was deleted";
 "lng_edit_too_long" = "Your message text is too long";

Telegram/SourceFiles/boxes/connection_box.cpp

@@ -31,6 +31,57 @@ namespace {
 
 constexpr auto kSaveSettingsDelayedTimeout = crl::time(1000);
 
+class Base64UrlInput : public Ui::MaskedInputField {
+public:
+	Base64UrlInput(
+		QWidget *parent,
+		const style::InputField &st,
+		rpl::producer<QString> placeholder,
+		const QString &val);
+
+protected:
+	void correctValue(
+		const QString &was,
+		int wasCursor,
+		QString &now,
+		int &nowCursor) override;
+
+};
+
+Base64UrlInput::Base64UrlInput(
+	QWidget *parent,
+	const style::InputField &st,
+	rpl::producer<QString> placeholder,
+	const QString &val)
+: MaskedInputField(parent, st, std::move(placeholder), val) {
+	if (!QRegularExpression("^[a-zA-Z0-9_\\-]+$").match(val).hasMatch()) {
+		setText(QString());
+	}
+}
+
+void Base64UrlInput::correctValue(
+		const QString &was,
+		int wasCursor,
+		QString &now,
+		int &nowCursor) {
+	QString newText;
+	newText.reserve(now.size());
+	auto newPos = nowCursor;
+	for (auto i = 0, l = now.size(); i < l; ++i) {
+		const auto ch = now[i];
+		if ((ch >= '0' && ch <= '9')
+			|| (ch >= 'a' && ch <= 'z')
+			|| (ch >= 'A' && ch <= 'Z')
+			|| (ch == '-')
+			|| (ch == '_')) {
+			newText.append(ch);
+		} else if (i < nowCursor) {
+			--newPos;
+		}
+	}
+	setCorrectedText(now, nowCursor, newText, newPos);
+}
+
 class ProxyRow : public Ui::RippleButton {
 public:
 	using View = ProxiesBoxController::ItemView;
@@ -150,7 +201,7 @@ private:
 	QPointer<Ui::PortInput> _port;
 	QPointer<Ui::InputField> _user;
 	QPointer<Ui::PasswordInput> _password;
-	QPointer<Ui::HexInput> _secret;
+	QPointer<Base64UrlInput> _secret;
 
 	QPointer<Ui::SlideWrap<Ui::VerticalLayout>> _credentials;
 	QPointer<Ui::SlideWrap<Ui::VerticalLayout>> _mtprotoCredentials;
@@ -852,12 +903,11 @@ void ProxyBox::setupMtprotoCredentials(const ProxyData &data) {
 	addLabel(mtproto, tr::lng_proxy_credentials(tr::now));
 
 	auto secretWrap = object_ptr<Ui::RpWidget>(mtproto);
-	_secret = Ui::CreateChild<Ui::HexInput>(
+	_secret = Ui::CreateChild<Base64UrlInput>(
 		secretWrap.data(),
 		st::connectionUserInputField,
 		tr::lng_connection_proxy_secret_ph(),
 		(data.type == Type::Mtproto) ? data.password : QString());
-	_secret->setMaxLength(ProxyData::MaxMtprotoPasswordLength());
 	_secret->move(0, 0);
 	_secret->heightValue(
 	) | rpl::start_with_next([=, wrap = secretWrap.data()](int height) {
@@ -975,6 +1025,11 @@ void ProxiesBoxController::ShowApplyConfirmation(
 				strong->closeBox();
 			}
 		}), LayerOption::KeepOther);
+	} else {
+		Ui::show(Box<InformBox>(
+			(proxy.status() == ProxyData::Status::Unsupported
+				? tr::lng_proxy_unsupported(tr::now)
+				: tr::lng_proxy_invalid(tr::now))));
 	}
 }
 

Telegram/SourceFiles/core/utils.cpp

@@ -84,8 +84,105 @@ std::atomic<int> GlobalAtomicRequestId = 0;
 	memset_rand(&msgIdRand, sizeof(uint32));
 	_msgIdStart = (((uint64)((uint32)unixtime()) << 32) | (uint64)msgIdRand);
 }
+
+[[nodiscard]] bool IsHexMtprotoPassword(const QString &password) {
+	const auto bad = [](QChar ch) {
+		const auto code = ch.unicode();
+		return (code < 'a' || code > 'f')
+			&& (code < 'A' || code > 'F')
+			&& (code < '0' || code > '9');
+	};
+	return (password.size() % 2 == 0)
+		&& (std::find_if(password.begin(), password.end(), bad)
+			== password.end());
 }
 
+[[nodiscard]] ProxyData::Status HexMtprotoPasswordStatus(
+	const QString &password) {
+	const auto size = password.size() / 2;
+	const auto valid = (size == 16)
+		|| (size == 17 && (password[0] == 'd') && (password[1] == 'd'))
+		|| (size >= 21 && (password[0] == 'e') && (password[1] == 'e'));
+	if (valid) {
+		return ProxyData::Status::Valid;
+	} else if (size < 16) {
+		return ProxyData::Status::Invalid;
+	}
+	return ProxyData::Status::Unsupported;
+}
+
+[[nodiscard]] bytes::vector SecretFromHexMtprotoPassword(
+		const QString &password) {
+	Expects(password.size() % 2 == 0);
+
+	const auto size = password.size() / 2;
+	const auto fromHex = [](QChar ch) -> int {
+		const auto code = int(ch.unicode());
+		if (code >= '0' && code <= '9') {
+			return (code - '0');
+		} else if (code >= 'A' && code <= 'F') {
+			return 10 + (code - 'A');
+		} else if (ch >= 'a' && ch <= 'f') {
+			return 10 + (code - 'a');
+		}
+		Unexpected("Code in ProxyData fromHex.");
+	};
+	auto result = bytes::vector(size);
+	for (auto i = 0; i != size; ++i) {
+		const auto high = fromHex(password[2 * i]);
+		const auto low = fromHex(password[2 * i + 1]);
+		if (high < 0 || low < 0) {
+			return {};
+		}
+		result[i] = static_cast<bytes::type>(high * 16 + low);
+	}
+	return result;
+}
+
+[[nodiscard]] bool IsBase64UrlMtprotoPassword(const QString &password) {
+	const auto bad = [](QChar ch) {
+		const auto code = ch.unicode();
+		return (code < 'a' || code > 'z')
+			&& (code < 'A' || code > 'Z')
+			&& (code < '0' || code > '9')
+			&& (code != '_')
+			&& (code != '-');
+	};
+	return (password.size() % 4 != 1)
+		&& (std::find_if(password.begin(), password.end(), bad)
+			== password.end());
+}
+
+[[nodiscard]] ProxyData::Status Base64UrlMtprotoPasswordStatus(
+		const QString &password) {
+	const auto size = (password.size() * 3) / 4;
+	const auto valid = (size == 16)
+		|| (size == 17
+			&& (password[0] == '3')
+			&& ((password[1] >= 'Q') && (password[1] <= 'Z')
+				|| (password[1] >= 'a') && (password[1] <= 'f')))
+		|| (size >= 21
+			&& (password[0] == '7')
+			&& (password[1] >= 'g')
+			&& (password[1] <= 'v'));
+	if (size < 16) {
+		return ProxyData::Status::Invalid;
+	} else if (valid) {
+		return ProxyData::Status::Valid;
+	}
+	return ProxyData::Status::Unsupported;
+}
+
+[[nodiscard]] bytes::vector SecretFromBase64UrlMtprotoPassword(
+		const QString &password) {
+	const auto result = QByteArray::fromBase64(
+		password.toLatin1(),
+		QByteArray::Base64UrlEncoding);
+	return bytes::make_vector(bytes::make_span(result));
+}
+
+} // namespace
+
 TimeId LocalUnixtime() {
 	return (TimeId)time(nullptr);
 }
@@ -233,16 +330,16 @@ namespace {
 }
 
 bool ProxyData::valid() const {
-	if (type == Type::None || host.isEmpty() || !port) {
+	return status() == Status::Valid;
-		return false;
-	} else if (type == Type::Mtproto && !ValidMtprotoPassword(password)) {
-		return false;
-	}
-	return true;
 }
 
-int ProxyData::MaxMtprotoPasswordLength() {
+ProxyData::Status ProxyData::status() const {
-	return 34;
+	if (type == Type::None || host.isEmpty() || !port) {
+		return Status::Invalid;
+	} else if (type == Type::Mtproto) {
+		return MtprotoPasswordStatus(password);
+	}
+	return Status::Valid;
 }
 
 bool ProxyData::supportsCalls() const {
@@ -259,31 +356,14 @@ bool ProxyData::tryCustomResolve() const {
 
 bytes::vector ProxyData::secretFromMtprotoPassword() const {
 	Expects(type == Type::Mtproto);
-	Expects(password.size() % 2 == 0);
 
-	const auto length = password.size() / 2;
+	if (IsHexMtprotoPassword(password)) {
-	const auto fromHex = [](QChar ch) -> int {
+		return SecretFromHexMtprotoPassword(password);
-		const auto code = int(ch.unicode());
+	} else if (IsBase64UrlMtprotoPassword(password)) {
-		if (code >= '0' && code <= '9') {
+		return SecretFromBase64UrlMtprotoPassword(password);
-			return (code - '0');
-		} else if (code >= 'A' && code <= 'F') {
-			return 10 + (code - 'A');
-		} else if (ch >= 'a' && ch <= 'f') {
-			return 10 + (code - 'a');
 	}
-		return -1;
-	};
-	auto result = bytes::vector(length);
-	for (auto i = 0; i != length; ++i) {
-		const auto high = fromHex(password[2 * i]);
-		const auto low = fromHex(password[2 * i + 1]);
-		if (high < 0 || low < 0) {
 	return {};
 }
-		result[i] = static_cast<gsl::byte>(high * 16 + low);
-	}
-	return result;
-}
 
 ProxyData::operator bool() const {
 	return valid();
@@ -304,16 +384,17 @@ bool ProxyData::operator!=(const ProxyData &other) const {
 	return !(*this == other);
 }
 
-bool ProxyData::ValidMtprotoPassword(const QString &secret) {
+bool ProxyData::ValidMtprotoPassword(const QString &password) {
-	using Expression = QRegularExpression;
+	return MtprotoPasswordStatus(password) == Status::Valid;
-	if (secret.size() == 32) {
-		static const auto check = Expression("^[a-fA-F0-9]{32}$");
-		return check.match(secret).hasMatch();
-	} else if (secret.size() == 34) {
-		static const auto check = Expression("^(dd|ee)[a-fA-F0-9]{32}$");
-		return check.match(secret).hasMatch();
 }
-	return false;
+
+ProxyData::Status ProxyData::MtprotoPasswordStatus(const QString &password) {
+	if (IsHexMtprotoPassword(password)) {
+		return HexMtprotoPasswordStatus(password);
+	} else if (IsBase64UrlMtprotoPassword(password)) {
+		return Base64UrlMtprotoPasswordStatus(password);
+	}
+	return Status::Invalid;
 }
 
 ProxyData ToDirectIpProxy(const ProxyData &proxy, int ipIndex) {

Telegram/SourceFiles/core/utils.h

@@ -270,6 +270,11 @@ struct ProxyData {
 		Http,
 		Mtproto,
 	};
+	enum class Status {
+		Valid,
+		Unsupported,
+		Invalid,
+	};
 
 	Type type = Type::None;
 	QString host;
@@ -279,16 +284,18 @@ struct ProxyData {
 	std::vector<QString> resolvedIPs;
 	crl::time resolvedExpireAt = 0;
 
-	bool valid() const;
+	[[nodiscard]] bool valid() const;
-	bool supportsCalls() const;
+	[[nodiscard]] Status status() const;
-	bool tryCustomResolve() const;
+	[[nodiscard]] bool supportsCalls() const;
-	bytes::vector secretFromMtprotoPassword() const;
+	[[nodiscard]] bool tryCustomResolve() const;
-	explicit operator bool() const;
+	[[nodiscard]] bytes::vector secretFromMtprotoPassword() const;
-	bool operator==(const ProxyData &other) const;
+	[[nodiscard]] explicit operator bool() const;
-	bool operator!=(const ProxyData &other) const;
+	[[nodiscard]] bool operator==(const ProxyData &other) const;
+	[[nodiscard]] bool operator!=(const ProxyData &other) const;
 
-	static bool ValidMtprotoPassword(const QString &secret);
+	[[nodiscard]] static bool ValidMtprotoPassword(const QString &password);
-	static int MaxMtprotoPasswordLength();
+	[[nodiscard]] static Status MtprotoPasswordStatus(
+		const QString &password);
 
 };
 

Telegram/SourceFiles/mtproto/connection_tcp.cpp

@@ -30,7 +30,7 @@ constexpr auto kConnectionStartPrefixSize = 64;
 
 class TcpConnection::Protocol {
 public:
-	static std::unique_ptr<Protocol> Create(bytes::vector &&secret);
+	static std::unique_ptr<Protocol> Create(bytes::const_span secret);
 
 	virtual uint32 id() const = 0;
 	virtual bool supportsArbitraryLength() const = 0;
@@ -223,15 +223,14 @@ bytes::const_span TcpConnection::Protocol::VersionD::readPacket(
 	return bytes.subspan(sizeLength, size - sizeLength);
 }
 
-auto TcpConnection::Protocol::Create(bytes::vector &&secret)
+auto TcpConnection::Protocol::Create(bytes::const_span secret)
 -> std::unique_ptr<Protocol> {
-	if (secret.size() == 17
+	if ((secret.size() >= 21 && secret[0] == bytes::type(0xEE))
-		&& (static_cast<uchar>(secret[0]) == 0xDD
+		|| (secret.size() == 17 && secret[0] == bytes::type(0xDD))) {
-			|| static_cast<uchar>(secret[0]) == 0xEE)) {
 		return std::make_unique<VersionD>(
-			bytes::make_vector(bytes::make_span(secret).subspan(1)));
+			bytes::make_vector(secret.subspan(1, 16)));
 	} else if (secret.size() == 16) {
-		return std::make_unique<Version1>(std::move(secret));
+		return std::make_unique<Version1>(bytes::make_vector(secret));
 	} else if (secret.empty()) {
 		return std::make_unique<Version0>();
 	}
@@ -522,10 +521,13 @@ void TcpConnection::connectToServer(
 	Expects(_protocol == nullptr);
 	Expects(_protocolDcId == 0);
 
+	const auto secret = (_proxy.type == ProxyData::Type::Mtproto)
+		? _proxy.secretFromMtprotoPassword()
+		: protocolSecret;
 	if (_proxy.type == ProxyData::Type::Mtproto) {
 		_address = _proxy.host;
 		_port = _proxy.port;
-		_protocol = Protocol::Create(_proxy.secretFromMtprotoPassword());
+		_protocol = Protocol::Create(secret);
 
 		DEBUG_LOG(("TCP Info: "
 			"dc:%1 - Connecting to proxy '%2'"
@@ -534,14 +536,17 @@ void TcpConnection::connectToServer(
 	} else {
 		_address = address;
 		_port = port;
-		_protocol = Protocol::Create(base::duplicate(protocolSecret));
+		_protocol = Protocol::Create(secret);
 
 		DEBUG_LOG(("TCP Info: "
 			"dc:%1 - Connecting to '%2'"
 			).arg(protocolDcId
 			).arg(_address + ':' + QString::number(_port)));
 	}
-	_socket = AbstractSocket::Create(thread(), protocolSecret, _proxy);
+	_socket = AbstractSocket::Create(
+		thread(),
+		secret,
+		ToNetworkProxy(_proxy));
 	_protocolDcId = protocolDcId;
 
 	_socket->connected(

Telegram/SourceFiles/mtproto/dc_options.cpp

@@ -257,7 +257,7 @@ bool DcOptions::ApplyOneOption(
 				return false;
 			}
 		}
-		i->second.push_back(Endpoint(dcId, flags, ip, port, secret));
+		i->second.emplace_back(dcId, flags, ip, port, secret);
 	} else {
 		data.emplace(dcId, std::vector<Endpoint>(
 			1,

Telegram/SourceFiles/mtproto/mtp_abstract_socket.cpp

@@ -16,12 +16,8 @@ namespace internal {
 std::unique_ptr<AbstractSocket> AbstractSocket::Create(
 		not_null<QThread*> thread,
 		const bytes::vector &secret,
-		const ProxyData &proxy) {
+		const QNetworkProxy &proxy) {
-	const auto proxySecret = (proxy.type == ProxyData::Type::Mtproto)
+	if (secret.size() >= 21 && secret[0] == bytes::type(0xEE)) {
-		? proxy.secretFromMtprotoPassword()
-		: bytes::vector();
-	const auto &usingSecret = proxySecret.empty() ? secret : proxySecret;
-	if (!usingSecret.empty() && usingSecret[0] == bytes::type(0xEE)) {
 		return std::make_unique<TlsSocket>(thread, secret, proxy);
 	} else {
 		return std::make_unique<TcpSocket>(thread, proxy);

Telegram/SourceFiles/mtproto/mtp_abstract_socket.h

@@ -17,7 +17,7 @@ public:
 	static std::unique_ptr<AbstractSocket> Create(
 		not_null<QThread*> thread,
 		const bytes::vector &secret,
-		const ProxyData &proxy);
+		const QNetworkProxy &proxy);
 
 	explicit AbstractSocket(not_null<QThread*> thread) {
 		moveToThread(thread);

Telegram/SourceFiles/mtproto/mtp_tcp_socket.cpp

@@ -10,10 +10,10 @@ https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
 namespace MTP {
 namespace internal {
 
-TcpSocket::TcpSocket(not_null<QThread*> thread, const ProxyData &proxy)
+TcpSocket::TcpSocket(not_null<QThread*> thread, const QNetworkProxy &proxy)
 : AbstractSocket(thread) {
 	_socket.moveToThread(thread);
-	_socket.setProxy(ToNetworkProxy(proxy));
+	_socket.setProxy(proxy);
 	const auto wrap = [&](auto handler) {
 		return [=](auto &&...args) {
 			InvokeQueued(this, [=] { handler(args...); });

Telegram/SourceFiles/mtproto/mtp_tcp_socket.h

@@ -14,7 +14,7 @@ namespace internal {
 
 class TcpSocket final : public AbstractSocket {
 public:
-	TcpSocket(not_null<QThread*> thread, const ProxyData &proxy);
+	TcpSocket(not_null<QThread*> thread, const QNetworkProxy &proxy);
 
 	void connectToHost(const QString &address, int port) override;
 	bool isConnected() override;

Telegram/SourceFiles/mtproto/mtp_tls_socket.cpp

@@ -131,8 +131,8 @@ class ClientHelloGenerator {
 public:
 	ClientHelloGenerator(
 		const MTPTlsClientHello &rules,
-		const QByteArray &domain,
+		bytes::const_span domain,
-		const bytes::vector &key);
+		bytes::const_span key);
 	[[nodiscard]] ClientHello result();
 
 private:
@@ -149,8 +149,8 @@ private:
 	void writeDigest();
 	void writeTimestamp();
 
-	const QByteArray &_domain;
+	bytes::const_span _domain;
-	const bytes::vector &_key;
+	bytes::const_span _key;
 	bytes::vector _greases;
 	std::vector<int> _scopeStack;
 	QByteArray _result;
@@ -162,8 +162,8 @@ private:
 
 ClientHelloGenerator::ClientHelloGenerator(
 	const MTPTlsClientHello &rules,
-	const QByteArray &domain,
+	bytes::const_span domain,
-	const bytes::vector &key)
+	bytes::const_span key)
 : _domain(domain)
 , _key(key)
 , _greases(PrepareGreases()) {
@@ -256,7 +256,7 @@ void ClientHelloGenerator::writeBlock(const MTPDtlsBlockDomain &data) {
 	if (storage.empty()) {
 		return;
 	}
-	bytes::copy(storage, bytes::make_span(_domain));
+	bytes::copy(storage, _domain);
 }
 
 void ClientHelloGenerator::writeBlock(const MTPDtlsBlockScope &data) {
@@ -309,22 +309,11 @@ void ClientHelloGenerator::writeTimestamp() {
 
 [[nodiscard]] ClientHello PrepareClientHello(
 		const MTPTlsClientHello &rules,
-		const QByteArray &domain,
+		bytes::const_span domain,
-		const bytes::vector &key) {
+		bytes::const_span key) {
 	return ClientHelloGenerator(rules, domain, key).result();
 }
 
-[[nodiscard]] bytes::vector ExtractKey(
-		const bytes::vector &secret,
-		const ProxyData &proxy) {
-	const auto proxySecret = proxy.secretFromMtprotoPassword();
-	const auto &useSecret = proxySecret.empty() ? secret : proxySecret;
-	if (useSecret.size() != 17 || useSecret[0] != bytes::type(0xEE)) {
-		return {};
-	}
-	return bytes::make_vector(bytes::make_span(useSecret).subspan(1));
-}
-
 [[nodiscard]] bool CheckPart(bytes::const_span data, QLatin1String check) {
 	if (data.size() < check.size()) {
 		return false;
@@ -345,11 +334,13 @@ void ClientHelloGenerator::writeTimestamp() {
 TlsSocket::TlsSocket(
 	not_null<QThread*> thread,
 	const bytes::vector &secret,
-	const ProxyData &proxy)
+	const QNetworkProxy &proxy)
 : AbstractSocket(thread)
-, _key(ExtractKey(secret, proxy)) {
+, _secret(secret) {
+	Expects(_secret.size() >= 21 && _secret[0] == bytes::type(0xEE));
+
 	_socket.moveToThread(thread);
-	_socket.setProxy(ToNetworkProxy(proxy));
+	_socket.setProxy(proxy);
 	const auto wrap = [&](auto handler) {
 		return [=](auto &&...args) {
 			InvokeQueued(this, [=] { handler(args...); });
@@ -377,6 +368,14 @@ TlsSocket::TlsSocket(
 		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;
@@ -385,8 +384,8 @@ void TlsSocket::plainConnected() {
 	static const auto kClientHelloRules = PrepareClientHelloRules();
 	const auto hello = PrepareClientHello(
 		kClientHelloRules,
-		"www.google.com",
+		domainFromSecret(),
-		_key);
+		keyFromSecret());
 	if (hello.data.isEmpty()) {
 		LOG(("TLS Error: Could not generate Client Hello!"));
 		_state = State::Error;
@@ -492,7 +491,7 @@ void TlsSocket::checkHelloDigest() {
 		kHelloDigestLength);
 	const auto digestCopy = bytes::make_vector(digest);
 	bytes::set_with_const(digest, bytes::type(0));
-	const auto check = openssl::HmacSha256(_key, fulldata);
+	const auto check = openssl::HmacSha256(keyFromSecret(), fulldata);
 	if (bytes::compare(digestCopy, check) != 0) {
 		LOG(("TLS Error: Bad Server Hello digest."));
 		handleError();

Telegram/SourceFiles/mtproto/mtp_tls_socket.h

@@ -17,7 +17,7 @@ public:
 	TlsSocket(
 		not_null<QThread*> thread,
 		const bytes::vector &secret,
-		const ProxyData &proxy);
+		const QNetworkProxy &proxy);
 
 	void connectToHost(const QString &address, int port) override;
 	bool isConnected() override;
@@ -36,6 +36,9 @@ private:
 		Error,
 	};
 
+	[[nodiscard]] bytes::const_span domainFromSecret() const;
+	[[nodiscard]] bytes::const_span keyFromSecret() const;
+
 	void plainConnected();
 	void plainDisconnected();
 	void plainReadyRead();
@@ -49,8 +52,8 @@ private:
 	[[nodiscard]] bool checkNextPacket();
 	void shiftIncomingBy(int amount);
 
+	const bytes::vector _secret;
 	QTcpSocket _socket;
-	bytes::vector _key;
 	State _state = State::NotConnected;
 	QByteArray _incoming;
 	int _incomingGoodDataOffset = 0;

Telegram/SourceFiles/storage/localstorage.cpp

@@ -1332,9 +1332,13 @@ bool _readSetting(quint32 blockId, QDataStream &stream, int version, ReadSetting
 
 			const auto unchecked = static_cast<ProxyData::Settings>(settings);
 			switch (unchecked) {
+			case ProxyData::Settings::Enabled:
+				Global::SetProxySettings(Global::SelectedProxy()
+					? ProxyData::Settings::Enabled
+					: ProxyData::Settings::System);
+				break;
 			case ProxyData::Settings::Disabled:
 			case ProxyData::Settings::System:
-			case ProxyData::Settings::Enabled:
 				Global::SetProxySettings(unchecked);
 				break;
 			default: