[Unit]
Description=lchat push relay
After=network-online.target
Wants=network-online.target

[Service]
# /data/push.env holds LCHAT_ADMIN_TOKEN + the APNs signing key (LCHAT_APNS_*).
# Required (no leading '-'): a push relay with no signing key is a fleet-wide iOS
# push outage, so it must fail to boot rather than start silently broken.
EnvironmentFile=/data/push.env
ExecStart=/opt/lchat/push --addr /run/lchat/push.sock --db /data/push.db
Restart=always
RestartSec=1

# --- hardening (see docs/instance-router.md § Hardening) ---
User=lchat
Group=lchat
CapabilityBoundingSet=
NoNewPrivileges=yes
ProtectSystem=strict
ProtectHome=yes
ReadWritePaths=/data /run/lchat
PrivateTmp=yes
PrivateDevices=yes
ProtectClock=yes
ProtectHostname=yes
ProtectKernelTunables=yes
ProtectKernelModules=yes
ProtectKernelLogs=yes
ProtectControlGroups=yes
ProtectProc=invisible
RestrictAddressFamilies=AF_INET AF_INET6 AF_UNIX
RestrictNamespaces=yes
RestrictRealtime=yes
RestrictSUIDSGID=yes
LockPersonality=yes
MemoryDenyWriteExecute=yes
SystemCallFilter=@system-service
SystemCallErrorNumber=EPERM
SystemCallArchitectures=native
MemoryMax=256M
TasksMax=256

[Install]
WantedBy=multi-user.target