333 lines
10 KiB
C++
333 lines
10 KiB
C++
/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include "wireguardutilswindows.h"
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#include <WS2tcpip.h>
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#include <iphlpapi.h>
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#include <windows.h>
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#include <winsock2.h>
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#include <ws2ipdef.h>
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#include <QFileInfo>
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#include "leakdetector.h"
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#include "logger.h"
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#include "windowsfirewall.h"
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#pragma comment(lib, "iphlpapi.lib")
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namespace {
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Logger logger("WireguardUtilsWindows");
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}; // namespace
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std::unique_ptr<WireguardUtilsWindows> WireguardUtilsWindows::create(
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WindowsFirewall* fw, QObject* parent) {
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if (!fw) {
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logger.error() << "WireguardUtilsWindows::create: no wfp handle";
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return {};
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}
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// Can't use make_unique here as the Constructor is private :(
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auto utils = new WireguardUtilsWindows(parent, fw);
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return std::unique_ptr<WireguardUtilsWindows>(utils);
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}
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WireguardUtilsWindows::WireguardUtilsWindows(QObject* parent, WindowsFirewall* fw)
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: WireguardUtils(parent), m_tunnel(this), m_firewall(fw) {
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MZ_COUNT_CTOR(WireguardUtilsWindows);
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logger.debug() << "WireguardUtilsWindows created.";
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connect(&m_tunnel, &WindowsTunnelService::backendFailure, this,
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[&] { emit backendFailure(); });
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}
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WireguardUtilsWindows::~WireguardUtilsWindows() {
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MZ_COUNT_DTOR(WireguardUtilsWindows);
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logger.debug() << "WireguardUtilsWindows destroyed.";
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}
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QList<WireguardUtils::PeerStatus> WireguardUtilsWindows::getPeerStatus() {
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QString reply = m_tunnel.uapiCommand("get=1");
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PeerStatus status;
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QList<PeerStatus> peerList;
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for (const QString& line : reply.split('\n')) {
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int eq = line.indexOf('=');
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if (eq <= 0) {
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continue;
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}
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QString name = line.left(eq);
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QString value = line.mid(eq + 1);
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if (name == "public_key") {
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if (!status.m_pubkey.isEmpty()) {
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peerList.append(status);
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}
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QByteArray pubkey = QByteArray::fromHex(value.toUtf8());
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status = PeerStatus(pubkey.toBase64());
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}
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if (name == "tx_bytes") {
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status.m_txBytes = value.toDouble();
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}
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if (name == "rx_bytes") {
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status.m_rxBytes = value.toDouble();
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}
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if (name == "last_handshake_time_sec") {
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status.m_handshake += value.toLongLong() * 1000;
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}
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if (name == "last_handshake_time_nsec") {
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status.m_handshake += value.toLongLong() / 1000000;
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}
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}
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if (!status.m_pubkey.isEmpty()) {
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peerList.append(status);
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}
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return peerList;
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}
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bool WireguardUtilsWindows::addInterface(const InterfaceConfig& config) {
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QStringList addresses;
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for (const IPAddress& ip : config.m_allowedIPAddressRanges) {
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addresses.append(ip.toString());
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}
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QMap<QString, QString> extraConfig;
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extraConfig["Table"] = "off";
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QString configString = config.toWgConf(extraConfig);
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if (configString.isEmpty()) {
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logger.error() << "Failed to create a config file";
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return false;
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}
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// We don't want to pass a peer just yet, that will happen later with
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// a UAPI command in WireguardUtilsWindows::updatePeer(), so truncate
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// the config file to remove the [Peer] section.
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qsizetype peerStart = configString.indexOf("[Peer]", 0, Qt::CaseSensitive);
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if (peerStart >= 0) {
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configString.truncate(peerStart);
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}
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if (!m_tunnel.start(configString)) {
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logger.error() << "Failed to activate the tunnel service";
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return false;
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}
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// Determine the interface LUID
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NET_LUID luid;
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QString ifAlias = interfaceName();
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DWORD result = ConvertInterfaceAliasToLuid((wchar_t*)ifAlias.utf16(), &luid);
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if (result != 0) {
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logger.error() << "Failed to lookup LUID:" << result;
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return false;
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}
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m_luid = luid.Value;
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m_routeMonitor = new WindowsRouteMonitor(luid.Value, this);
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if (config.m_killSwitchEnabled) {
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// Enable the windows firewall
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NET_IFINDEX ifindex;
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ConvertInterfaceLuidToIndex(&luid, &ifindex);
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m_firewall->enableInterface(ifindex);
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}
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logger.debug() << "Registration completed";
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return true;
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}
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bool WireguardUtilsWindows::deleteInterface() {
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if (m_routeMonitor) {
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m_routeMonitor->deleteLater();
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}
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m_firewall->disableKillSwitch();
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m_tunnel.stop();
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return true;
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}
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bool WireguardUtilsWindows::updatePeer(const InterfaceConfig& config) {
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QByteArray publicKey =
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QByteArray::fromBase64(qPrintable(config.m_serverPublicKey));
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QByteArray pskKey =
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QByteArray::fromBase64(qPrintable(config.m_serverPskKey));
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if (config.m_killSwitchEnabled) {
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// Enable the windows firewall for this peer.
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m_firewall->enablePeerTraffic(config);
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}
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logger.debug() << "Configuring peer" << publicKey.toHex()
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<< "via" << config.m_serverIpv4AddrIn;
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// Update/create the peer config
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QString message;
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QTextStream out(&message);
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out << "set=1\n";
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out << "public_key=" << QString(publicKey.toHex()) << "\n";
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if (!config.m_serverPskKey.isNull()) {
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out << "preshared_key=" << QString(pskKey.toHex()) << "\n";
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}
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if (!config.m_serverIpv4AddrIn.isNull()) {
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out << "endpoint=" << config.m_serverIpv4AddrIn << ":";
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} else if (!config.m_serverIpv6AddrIn.isNull()) {
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out << "endpoint=[" << config.m_serverIpv6AddrIn << "]:";
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} else {
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logger.warning() << "Failed to create peer with no endpoints";
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return false;
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}
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out << config.m_serverPort << "\n";
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out << "replace_allowed_ips=true\n";
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out << "persistent_keepalive_interval=" << WG_KEEPALIVE_PERIOD << "\n";
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for (const IPAddress& ip : config.m_allowedIPAddressRanges) {
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out << "allowed_ip=" << ip.toString() << "\n";
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}
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// Exclude the server address, except for multihop exit servers.
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if (m_routeMonitor && config.m_hopType != InterfaceConfig::MultiHopExit) {
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m_routeMonitor->addExclusionRoute(IPAddress(config.m_serverIpv4AddrIn));
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m_routeMonitor->addExclusionRoute(IPAddress(config.m_serverIpv6AddrIn));
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}
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QString reply = m_tunnel.uapiCommand(message);
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logger.debug() << "DATA:" << reply;
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return true;
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}
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bool WireguardUtilsWindows::deletePeer(const InterfaceConfig& config) {
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QByteArray publicKey =
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QByteArray::fromBase64(qPrintable(config.m_serverPublicKey));
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// Clear exclustion routes for this peer.
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if (m_routeMonitor && config.m_hopType != InterfaceConfig::MultiHopExit) {
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m_routeMonitor->deleteExclusionRoute(IPAddress(config.m_serverIpv4AddrIn));
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m_routeMonitor->deleteExclusionRoute(IPAddress(config.m_serverIpv6AddrIn));
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}
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// Disable the windows firewall for this peer.
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m_firewall->disablePeerTraffic(config.m_serverPublicKey);
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QString message;
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QTextStream out(&message);
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out << "set=1\n";
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out << "public_key=" << QString(publicKey.toHex()) << "\n";
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out << "remove=true\n";
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QString reply = m_tunnel.uapiCommand(message);
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logger.debug() << "DATA:" << reply;
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return true;
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}
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void WireguardUtilsWindows::buildMibForwardRow(const IPAddress& prefix,
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void* row) {
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MIB_IPFORWARD_ROW2* entry = (MIB_IPFORWARD_ROW2*)row;
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InitializeIpForwardEntry(entry);
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// Populate the next hop
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if (prefix.type() == QAbstractSocket::IPv6Protocol) {
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InetPtonA(AF_INET6, qPrintable(prefix.address().toString()),
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&entry->DestinationPrefix.Prefix.Ipv6.sin6_addr);
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entry->DestinationPrefix.Prefix.Ipv6.sin6_family = AF_INET6;
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entry->DestinationPrefix.PrefixLength = prefix.prefixLength();
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} else {
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InetPtonA(AF_INET, qPrintable(prefix.address().toString()),
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&entry->DestinationPrefix.Prefix.Ipv4.sin_addr);
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entry->DestinationPrefix.Prefix.Ipv4.sin_family = AF_INET;
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entry->DestinationPrefix.PrefixLength = prefix.prefixLength();
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}
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entry->InterfaceLuid.Value = m_luid;
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entry->NextHop.si_family = entry->DestinationPrefix.Prefix.si_family;
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// Set the rest of the flags for a static route.
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entry->ValidLifetime = 0xffffffff;
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entry->PreferredLifetime = 0xffffffff;
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entry->Metric = 0;
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entry->Protocol = MIB_IPPROTO_NETMGMT;
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entry->Loopback = false;
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entry->AutoconfigureAddress = false;
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entry->Publish = false;
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entry->Immortal = false;
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entry->Age = 0;
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}
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bool WireguardUtilsWindows::updateRoutePrefix(const IPAddress& prefix) {
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if (m_routeMonitor && (prefix.prefixLength() == 0)) {
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// If we are setting up a default route, instruct the route monitor to
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// capture traffic to all non-excluded destinations
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m_routeMonitor->setDetaultRouteCapture(true);
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}
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// Build the route
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MIB_IPFORWARD_ROW2 entry;
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buildMibForwardRow(prefix, &entry);
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// Install the route
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DWORD result = CreateIpForwardEntry2(&entry);
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if (result == ERROR_OBJECT_ALREADY_EXISTS) {
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return true;
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}
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// Case for ipv6 route with disabled ipv6
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if (prefix.address().protocol() == QAbstractSocket::IPv6Protocol
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&& result == ERROR_NOT_FOUND) {
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return true;
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}
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if (result != NO_ERROR) {
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logger.error() << "Failed to create route to"
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<< prefix.toString()
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<< "result:" << result;
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}
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return result == NO_ERROR;
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}
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bool WireguardUtilsWindows::deleteRoutePrefix(const IPAddress& prefix) {
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if (m_routeMonitor && (prefix.prefixLength() == 0)) {
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// Deactivate the route capture feature.
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m_routeMonitor->setDetaultRouteCapture(false);
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}
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// Build the route
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MIB_IPFORWARD_ROW2 entry;
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buildMibForwardRow(prefix, &entry);
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// Install the route
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DWORD result = DeleteIpForwardEntry2(&entry);
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if (result == ERROR_NOT_FOUND) {
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return true;
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}
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if (result != NO_ERROR) {
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logger.error() << "Failed to delete route to"
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<< prefix.toString()
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<< "result:" << result;
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}
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return result == NO_ERROR;
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}
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bool WireguardUtilsWindows::addExclusionRoute(const IPAddress& prefix) {
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return m_routeMonitor->addExclusionRoute(prefix);
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}
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bool WireguardUtilsWindows::deleteExclusionRoute(const IPAddress& prefix) {
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return m_routeMonitor->deleteExclusionRoute(prefix);
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}
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bool WireguardUtilsWindows::excludeLocalNetworks(
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const QList<IPAddress>& addresses) {
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// If the interface isn't up then something went horribly wrong.
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Q_ASSERT(m_routeMonitor);
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// For each destination - attempt to exclude it from the VPN tunnel.
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bool result = true;
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for (const IPAddress& prefix : addresses) {
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if (!m_routeMonitor->addExclusionRoute(prefix)) {
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result = false;
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}
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}
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// Permit LAN traffic through the firewall.
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if (!m_firewall->enableLanBypass(addresses)) {
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result = false;
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}
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return result;
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}
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