fix: outbound freedom for xray (#2479)

* fix: outbound freedom for xray on linux

* fix: outbound freedom for xray on macOS

* build: auto-generate pf rules based on the build type

.gitignore

@@ -81,6 +81,7 @@ client/.DS_Store
 ._.DS_Store
 ._*
 *.dmg
+deploy/data/macos/pf/amn.400.allowPIA.conf
 
 # tmp files
 *.*~

CMakeLists.txt

@@ -42,6 +42,27 @@ if(APPLE)
     endif()
 endif()
 
+if(APPLE AND NOT IOS)
+    if(CMAKE_BUILD_TYPE STREQUAL "Debug")
+        set(AMN_PF_RULE_IDENTITY "user { root }")
+    else()
+        set(AMN_PF_RULE_IDENTITY "group { amnvpn }")
+    endif()
+
+    configure_file(
+        "${CMAKE_SOURCE_DIR}/deploy/data/pf-templates/amn.400.allowPIA.conf.in"
+        "${CMAKE_CURRENT_BINARY_DIR}/amn.400.allowPIA.conf"
+        @ONLY
+    )
+
+    file(COPY_FILE
+        "${CMAKE_CURRENT_BINARY_DIR}/amn.400.allowPIA.conf"
+        "${CMAKE_SOURCE_DIR}/deploy/data/macos/pf/amn.400.allowPIA.conf"
+        ONLY_IF_DIFFERENT
+    )
+endif()
+
+
 add_subdirectory(client)
 
 if(NOT IOS AND NOT ANDROID AND NOT MACOS_NE)

client/platforms/linux/daemon/linuxfirewall.cpp

@@ -32,6 +32,7 @@
 
 #include "linuxfirewall.h"
 #include "logger.h"
+#include "xray_defs.h"
 #include <QProcess>
 
 #define BRAND_CODE "amn"
@@ -282,6 +283,10 @@ void LinuxFirewall::install()
                                                             QStringLiteral("-o tun2+ -j ACCEPT"),
                                                         });
 
+    installAnchor(Both, QStringLiteral("130.allowMarkedXray"), {
+                                                             QStringLiteral("-m mark --mark %1 -j ACCEPT").arg(amnezia::xray::xrayTrafficMark),
+                                                         });
+
     installAnchor(IPv4, QStringLiteral("120.blockNets"), {});
 
     installAnchor(IPv4, QStringLiteral("110.allowNets"), {});
@@ -358,6 +363,7 @@ void LinuxFirewall::uninstall()
     uninstallAnchor(IPv6, QStringLiteral("250.blockIPv6"));
     uninstallAnchor(Both, QStringLiteral("200.allowVPN"));
     uninstallAnchor(IPv4, QStringLiteral("120.blockNets"));
+    uninstallAnchor(Both, QStringLiteral("130.allowMarkedXray"));
     uninstallAnchor(IPv4, QStringLiteral("110.allowNets"));
     uninstallAnchor(Both, QStringLiteral("100.blockAll"));
 

client/vpnConnection.cpp

@@ -92,7 +92,13 @@ void VpnConnection::onConnectionStateChanged(Vpn::ConnectionState state)
                     QString dns1 = m_vpnConfiguration.value(configKey::dns1).toString();
                     QString dns2 = m_vpnConfiguration.value(configKey::dns2).toString();
 
+#ifdef Q_OS_MACOS
+                    if (!m_appSettingsRepository->isSitesSplitTunnelingEnabled() || m_appSettingsRepository->routeMode() != amnezia::RouteMode::VpnAllExceptSites) {
+                        iface->routeAddList(m_vpnProtocol->vpnGateway(), QStringList() << dns1 << dns2);
+                    }
+#else
                     iface->routeAddList(m_vpnProtocol->vpnGateway(), QStringList() << dns1 << dns2);
+#endif
 
                     if (m_appSettingsRepository->isSitesSplitTunnelingEnabled()) {
                         iface->routeDeleteList(m_vpnProtocol->vpnGateway(), QStringList() << "0.0.0.0");
@@ -105,6 +111,9 @@ void VpnConnection::onConnectionStateChanged(Vpn::ConnectionState state)
                             iface->routeAddList(m_vpnProtocol->vpnGateway(), QStringList() << "128.0.0.0/1");
 
                             iface->routeAddList(m_vpnProtocol->routeGateway(), QStringList() << remoteAddress());
+#ifdef Q_OS_MACOS
+                            iface->routeAddList(m_vpnProtocol->routeGateway(), QStringList() << dns1 << dns2);
+#endif
                             addSitesRoutes(m_vpnProtocol->routeGateway(), routeMode);
                         }
                     }

deploy/data/macos/AmneziaVPN.plist

@@ -12,6 +12,8 @@
     <true/>
     <key>RunAtLoad</key>
     <true/>
+    <key>GroupName</key>
+    <string>amnvpn</string>
     <key>Sockets</key>
 	<dict>
 	    <key>Listeners</key>

deploy/data/macos/pf/amn.400.allowPIA.conf

@@ -1,2 +0,0 @@
-# Allow traffic by privileged group (used by daemon)
-pass out proto { tcp, udp } group  { amnvpn } flags any no state

deploy/data/macos/post_install.sh

@@ -1,6 +1,7 @@
 #!/bin/bash
 
 APP_NAME=AmneziaVPN
+SERVICE_GROUP=amnvpn
 PLIST_NAME=$APP_NAME.plist
 LAUNCH_DAEMONS_PLIST_NAME=/Library/LaunchDaemons/$PLIST_NAME
 LOG_FOLDER=/var/log/$APP_NAME
@@ -34,6 +35,18 @@ fi
 run_cmd launchctl bootout system "$LAUNCH_DAEMONS_PLIST_NAME" || run_cmd launchctl unload "$LAUNCH_DAEMONS_PLIST_NAME"
 run_cmd rm -f "$LAUNCH_DAEMONS_PLIST_NAME"
 
+# Add separate group for xray filtering
+if dscl . -read "/Groups/$SERVICE_GROUP" >/dev/null 2>&1; then
+  log "Group $SERVICE_GROUP already exists"
+  return 0
+else
+  local next_gid
+  next_gid=$(dscl . -list /Groups PrimaryGroupID 2>/dev/null | awk '{print $2}' | sort -n | awk '$1>=500{g=$1} END{print (g?g+1:501)}')
+  run_cmd dscl . -create "/Groups/$SERVICE_GROUP"
+  run_cmd dscl . -create "/Groups/$SERVICE_GROUP" PrimaryGroupID "$next_gid"
+  run_cmd dscl . -create "/Groups/$SERVICE_GROUP" RealName "Amnezia VPN Service Group"
+fi
+
 run_cmd sudo chmod -R a-w "$APP_PATH/"
 run_cmd sudo chown -R root "$APP_PATH/"
 run_cmd sudo chgrp -R wheel "$APP_PATH/"

deploy/data/macos/post_uninstall.sh

@@ -8,6 +8,7 @@ USER_APP_SUPPORT="$HOME/Library/Application Support/$APP_NAME"
 SYSTEM_APP_SUPPORT="/Library/Application Support/$APP_NAME"
 LOG_FOLDER="/var/log/$APP_NAME"
 CACHES_FOLDER="$HOME/Library/Caches/$APP_NAME"
+SERVICE_GROUP="amnvpn"
 
 # Attempt to quit the GUI application if it's currently running
 if pgrep -x "$APP_NAME" > /dev/null; then
@@ -81,4 +82,20 @@ if sudo pfctl -s info 2>/dev/null | grep -q '^Status: Enabled' && \
     sudo pfctl -d 2>/dev/null || true
 fi
 
+# Remove amnvpn group if it's not referenced by users
+if dscl . -read "/Groups/$SERVICE_GROUP" >/dev/null 2>&1; then
+    group_gid=$(dscl . -read "/Groups/$SERVICE_GROUP" PrimaryGroupID 2>/dev/null | awk '{print $2}')
+    users_with_primary_gid=""
+    if [ -n "$group_gid" ]; then
+        users_with_primary_gid=$(dscl . -list /Users PrimaryGroupID 2>/dev/null | awk -v gid="$group_gid" '$2 == gid {print $1}')
+    fi
+
+    if [ -z "$users_with_primary_gid" ]; then
+        echo "Removing group $SERVICE_GROUP"
+        sudo dscl . -delete "/Groups/$SERVICE_GROUP" || true
+    else
+        echo "Keeping group $SERVICE_GROUP (still used by users): $users_with_primary_gid"
+    fi
+fi
+
 # -----------------------------------------------------------

deploy/data/pf-templates/amn.400.allowPIA.conf.in

@@ -0,0 +1,2 @@
+# Allow traffic by configured identity (set by CMake)
+pass out proto { tcp, udp } @AMN_PF_RULE_IDENTITY@ flags any no state

service/server/killswitch.cpp

@@ -84,6 +84,7 @@ bool KillSwitch::disableKillSwitch() {
         LinuxFirewall::setAnchorEnabled(LinuxFirewall::Both, QStringLiteral("100.blockAll"), true);
         LinuxFirewall::setAnchorEnabled(LinuxFirewall::IPv4, QStringLiteral("110.allowNets"), false);
         LinuxFirewall::setAnchorEnabled(LinuxFirewall::IPv4, QStringLiteral("120.blockNets"), false);
+        LinuxFirewall::setAnchorEnabled(LinuxFirewall::Both, QStringLiteral("130.allowMarkedXray"), false);
         LinuxFirewall::setAnchorEnabled(LinuxFirewall::IPv4, QStringLiteral("200.allowVPN"), false);
         LinuxFirewall::setAnchorEnabled(LinuxFirewall::IPv6, QStringLiteral("250.blockIPv6"), true);
         LinuxFirewall::setAnchorEnabled(LinuxFirewall::Both, QStringLiteral("290.allowDHCP"), false);
@@ -96,6 +97,7 @@ bool KillSwitch::disableKillSwitch() {
         LinuxFirewall::setAnchorEnabled(LinuxFirewall::Both, QStringLiteral("100.blockAll"), false);
         LinuxFirewall::setAnchorEnabled(LinuxFirewall::IPv4, QStringLiteral("110.allowNets"), false);
         LinuxFirewall::setAnchorEnabled(LinuxFirewall::IPv4, QStringLiteral("120.blockNets"), false);
+        LinuxFirewall::setAnchorEnabled(LinuxFirewall::Both, QStringLiteral("130.allowMarkedXray"), false);
         LinuxFirewall::setAnchorEnabled(LinuxFirewall::IPv4, QStringLiteral("200.allowVPN"), false);
         LinuxFirewall::setAnchorEnabled(LinuxFirewall::IPv6, QStringLiteral("250.blockIPv6"), false);
         LinuxFirewall::setAnchorEnabled(LinuxFirewall::Both, QStringLiteral("290.allowDHCP"), true);
@@ -118,6 +120,7 @@ bool KillSwitch::disableKillSwitch() {
         MacOSFirewall::setAnchorEnabled(QStringLiteral("290.allowDHCP"), false);
         MacOSFirewall::setAnchorEnabled(QStringLiteral("300.allowLAN"), false);
         MacOSFirewall::setAnchorEnabled(QStringLiteral("310.blockDNS"), false);
+        MacOSFirewall::setAnchorEnabled(QStringLiteral("400.allowPIA"), false);
     } else {
         MacOSFirewall::uninstall();
     }
@@ -143,6 +146,7 @@ bool KillSwitch::disableAllTraffic() {
         LinuxFirewall::install();
     }
     LinuxFirewall::setAnchorEnabled(LinuxFirewall::Both, QStringLiteral("100.blockAll"), true);
+    LinuxFirewall::setAnchorEnabled(LinuxFirewall::Both, QStringLiteral("130.allowMarkedXray"), false);
     LinuxFirewall::setAnchorEnabled(LinuxFirewall::Both, QStringLiteral("000.allowLoopback"), true);
     LinuxFirewall::setAnchorEnabled(LinuxFirewall::IPv6, QStringLiteral("250.blockIPv6"), true);
 #endif
@@ -279,15 +283,18 @@ bool KillSwitch::enableKillSwitch(const QJsonObject &configStr, int vpnAdapterIn
     bool blockAll = 0;
     bool allowNets = 0;
     bool blockNets = 0;
+    bool allowMarkedXray = 0;
     QStringList allownets;
     QStringList blocknets;
 
     if (splitTunnelType == 0) {
         blockAll = true;
         allowNets = true;
+        allowMarkedXray = true;
         allownets.append(configStr.value("vpnServer").toString());
     } else if (splitTunnelType == 1) {
         blockNets = true;
+        allowMarkedXray = true;
         for (auto v : splitTunnelSites) {
             blocknets.append(v.toString());
         }
@@ -313,6 +320,7 @@ bool KillSwitch::enableKillSwitch(const QJsonObject &configStr, int vpnAdapterIn
     LinuxFirewall::updateAllowNets(allownets);
     LinuxFirewall::setAnchorEnabled(LinuxFirewall::IPv4, QStringLiteral("120.blockNets"), blockAll);
     LinuxFirewall::updateBlockNets(blocknets);
+    LinuxFirewall::setAnchorEnabled(LinuxFirewall::Both, QStringLiteral("130.allowMarkedXray"), true);
     LinuxFirewall::setAnchorEnabled(LinuxFirewall::IPv4, QStringLiteral("200.allowVPN"), true);
     LinuxFirewall::setAnchorEnabled(LinuxFirewall::IPv6, QStringLiteral("250.blockIPv6"), true);
     LinuxFirewall::setAnchorEnabled(LinuxFirewall::Both, QStringLiteral("290.allowDHCP"), true);
@@ -378,6 +386,7 @@ bool KillSwitch::enableKillSwitch(const QJsonObject &configStr, int vpnAdapterIn
     
     MacOSFirewall::setAnchorEnabled(QStringLiteral("310.blockDNS"), true);
     MacOSFirewall::setAnchorTable(QStringLiteral("310.blockDNS"), true, QStringLiteral("dnsaddr"), dnsServers);
+    MacOSFirewall::setAnchorEnabled(QStringLiteral("400.allowPIA"), true);
 #endif
     return true;
 }

service/server/router_mac.cpp

@@ -162,6 +162,96 @@ bool RouterMac::restoreResolvers() {
     return m_dnsUtil->restoreResolvers();
 }
 
+bool RouterMac::routeAddXray(const QString& ifname, const QString& gateway)
+{
+    if (ifname.isEmpty() || gateway.isEmpty()) {
+        qWarning().noquote() << "routeAddXray: invalid iface/gateway:" << ifname << gateway;
+        return false;
+    }
+
+    QString cmd = QString("route add -net 0.0.0.0/1 %1 -ifscope %2").arg(gateway).arg(ifname);
+    QStringList parts = cmd.split(" ");
+
+    int argc = parts.size();
+    char **argv = new char*[argc];
+    for (int i = 0; i < argc; i++) {
+        argv[i] = new char[parts.at(i).toStdString().length() + 1];
+        strcpy(argv[i], parts.at(i).toStdString().c_str());
+    }
+    mainRouteIface(argc, argv);
+    for (int i = 0; i < argc; i++) {
+        delete [] argv[i];
+    }
+    delete[] argv;
+
+    cmd = QString("route add -net 128.0.0.0/1 %1 -ifscope %2").arg(gateway).arg(ifname);
+    parts = cmd.split(" ");
+
+    argc = parts.size();
+    argv = new char*[argc];
+    for (int i = 0; i < argc; i++) {
+        argv[i] = new char[parts.at(i).toStdString().length() + 1];
+        strcpy(argv[i], parts.at(i).toStdString().c_str());
+    }
+    mainRouteIface(argc, argv);
+    for (int i = 0; i < argc; i++) {
+        delete [] argv[i];
+    }
+    delete[] argv;
+
+    qDebug().noquote() << "Installed xray routes via" << gateway << "on" << ifname;
+    return true;
+}
+
+bool RouterMac::routeDeleteXray(const QString& ifname, const QString& gateway)
+{
+    if (ifname.isEmpty()) {
+        return false;
+    }
+
+    QString cmd;
+    if (!gateway.isEmpty()) {
+        cmd = QString("route delete -net 0.0.0.0/1 %1 -ifscope %2").arg(gateway).arg(ifname);
+    } else {
+        cmd = QString("route delete -net 0.0.0.0/1 -ifscope %1").arg(ifname);
+    }
+    QStringList parts = cmd.split(" ");
+
+    int argc = parts.size();
+    char **argv = new char*[argc];
+    for (int i = 0; i < argc; i++) {
+        argv[i] = new char[parts.at(i).toStdString().length() + 1];
+        strcpy(argv[i], parts.at(i).toStdString().c_str());
+    }
+    mainRouteIface(argc, argv);
+    for (int i = 0; i < argc; i++) {
+        delete [] argv[i];
+    }
+    delete[] argv;
+
+    if (!gateway.isEmpty()) {
+        cmd = QString("route delete -net 128.0.0.0/1 %1 -ifscope %2").arg(gateway).arg(ifname);
+    } else {
+        cmd = QString("route delete -net 128.0.0.0/1 -ifscope %1").arg(ifname);
+    }
+    parts = cmd.split(" ");
+
+    argc = parts.size();
+    argv = new char*[argc];
+    for (int i = 0; i < argc; i++) {
+        argv[i] = new char[parts.at(i).toStdString().length() + 1];
+        strcpy(argv[i], parts.at(i).toStdString().c_str());
+    }
+    mainRouteIface(argc, argv);
+    for (int i = 0; i < argc; i++) {
+        delete [] argv[i];
+    }
+    delete[] argv;
+
+    qDebug().noquote() << "Removed xray routes on" << ifname;
+    return true;
+}
+
 bool RouterMac::deleteTun(const QString &dev)
 {
     qDebug().noquote() << "deleteTun start";

service/server/router_mac.h

@@ -34,6 +34,8 @@ public:
     bool deleteTun(const QString &dev);
     bool updateResolvers(const QString& ifname, const QList<QHostAddress>& resolvers);
     bool restoreResolvers();
+    bool routeAddXray(const QString& ifname, const QString& gateway);
+    bool routeDeleteXray(const QString& ifname, const QString& gateway);
     
 public slots:
 
@@ -47,4 +49,3 @@ private:
 };
 
 #endif // ROUTERMAC_H
-

service/server/xray.cpp

@@ -1,5 +1,8 @@
 #include "xray.h"
 #include "core/utils/networkUtilities.h"
+#ifdef Q_OS_MAC
+#include "router_mac.h"
+#endif
 
 #include <QDebug>
 #include <QNetworkInterface>
@@ -25,18 +28,34 @@
 #endif
 #ifdef Q_OS_LINUX
     #include <sys/socket.h>
+    #include "xray_defs.h"
 #endif
 
 bool Xray::startXray(const QString &cfg)
 {
     qDebug() << "Xray::startXray()";
-
+    const auto gatewayAndIface = NetworkUtilities::getGatewayAndIface();
-    auto defaultIface = NetworkUtilities::getGatewayAndIface().second;
+    const QString defaultGateway = gatewayAndIface.first;
+    const QNetworkInterface defaultIface = gatewayAndIface.second;
 #ifdef Q_OS_LINUX
     m_defaultIfaceName = defaultIface.name().toUtf8();
 #else
     m_defaultIfaceIdx = defaultIface.index();
 #endif
+    if (defaultIface.index() > 0) {
+        qDebug() << "[xray] using uplink interface:" << defaultIface.name() << "(" << defaultIface.index() << ")";
+    }
+
+#ifdef Q_OS_MAC
+    m_uplinkIfaceName = defaultIface.name();
+    m_uplinkGateway = defaultGateway;
+    if (!m_uplinkIfaceName.isEmpty()) {
+        const bool installed = RouterMac::Instance().routeAddXray(m_uplinkIfaceName, m_uplinkGateway);
+        if (!installed) {
+            qWarning() << "[xray] failed to install xray routes on" << m_uplinkIfaceName;
+        }
+    }
+#endif
 
     if (auto err = amnezia_xray_setsockcallback(ctxSockCallback, this); err != nullptr) {
         qDebug() << "[xray] sockopt failed: " << err;
@@ -65,13 +84,22 @@ bool Xray::startXray(const QString &cfg)
 bool Xray::stopXray()
 {
     qDebug() << "Xray::stopXray()";
+    bool success = true;
     if (auto err = amnezia_xray_stop(); err != nullptr) {
         qDebug() << "[xray] failed to stop: " << err;
         amnezia_xray_free(err);
-        return false;
+        success = false;
     }
 
-    return true;
+#ifdef Q_OS_MAC
+    if (!m_uplinkIfaceName.isEmpty()) {
+        RouterMac::Instance().routeDeleteXray(m_uplinkIfaceName, m_uplinkGateway);
+    }
+    m_uplinkIfaceName.clear();
+    m_uplinkGateway.clear();
+#endif
+
+    return success;
 }
 
 void Xray::logHandler(char* str)
@@ -99,6 +127,7 @@ void Xray::sockCallback(uintptr_t fd)
 #ifdef Q_OS_LINUX
     if (!m_defaultIfaceName.isEmpty()) {
         setsockopt(fd, SOL_SOCKET, SO_BINDTODEVICE, m_defaultIfaceName.data(), m_defaultIfaceName.size());
+        setsockopt(fd, SOL_SOCKET, SO_MARK, &amnezia::xray::xrayTrafficMark, sizeof(amnezia::xray::xrayTrafficMark));
     }
 #endif
 }

service/server/xray.h

@@ -31,6 +31,11 @@ private:
 #else
     int m_defaultIfaceIdx;
 #endif
+
+#ifdef Q_OS_MAC
+    QString m_uplinkIfaceName;
+    QString m_uplinkGateway;
+#endif
 };
 
 #endif // XRAY_H

service/server/xray_defs.h

@@ -0,0 +1,11 @@
+#ifndef XRAY_DEFS_H
+#define XRAY_DEFS_H
+
+namespace amnezia
+{
+    namespace xray
+    {
+        constexpr unsigned int xrayTrafficMark = 0x82;
+    }
+}
+#endif // XRAY_DEFS_H