[Unit]
Description=GO Simple Tunnel
Documentation=https://gost.run/
After=network-online.target nss-lookup.target
ConditionPathExists=/etc/gost/gost.yml

[Service]
Type=simple
WorkingDirectory=/run/gost
ExecStart=/usr/bin/gost -C /etc/gost/gost.yml
ExecReload=/bin/kill -SIGHUP $MAINPID

DynamicUser=yes
ConfigurationDirectory=gost
RuntimeDirectory=gost
LogsDirectory=gost
TimeoutStopSec=5s
Restart=on-failure
RestartSec=1s

AmbientCapabilities=CAP_NET_ADMIN CAP_NET_BIND_SERVICE
CapabilityBoundingSet=CAP_NET_ADMIN CAP_NET_BIND_SERVICE

PrivateTmp=yes
PrivateDevices=no
ProtectSystem=full
ProtectHostname=yes
ProtectHome=yes
ProtectKernelTunables=yes
ProtectKernelLogs=yes
ProtectKernelModules=yes
ProtectControlGroups=yes
ProtectClock=yes
MemoryDenyWriteExecute=yes
NoNewPrivileges=yes

SystemCallFilter=~@privileged @mount @debug @cpu-emulation @obsolete
SystemCallFilter=@chown
SystemCallErrorNumber=EPERM
SystemCallArchitectures=native
RestrictNamespaces=yes
RestrictSUIDSGID=yes
LockPersonality=yes

[Install]
WantedBy=multi-user.target