[Unit]
Description=Rocket.Chat server
Wants=__MONGODB_SERVICENAME__.service
After=network.target remote-fs.target nss-lookup.target nginx.service __MONGODB_SERVICENAME__.service

[Service]
User=__APP__
Group=__APP__
Environment="NODE_ENV=production"
WorkingDirectory=__INSTALL_DIR__/
Environment="PATH=__PATH_WITH_NODEJS__"
ExecStart=__NODEJS_DIR__/node __INSTALL_DIR__/main.js
SyslogIdentifier=__APP__
Environment=MONGO_URL=mongodb://localhost:27017/__APP__?replicaSet=rs01
Environment=MONGO_OPLOG_URL=mongodb://localhost:27017/local?replicaSet=rs01
Environment=ROOT_URL=https://__DOMAIN__
Environment=PORT=__PORT__
Environment=ADMIN_USERNAME="__ADMIN__"
Environment=ADMIN_PASS="__PASSWORD__"
Environment=ADMIN_EMAIL="__EMAIL__"
Environment=OVERWRITE_SETTING_Show_Setup_Wizard=completed
Restart=on-failure
RestartSec=1s

# Sandboxing options to harden security
# Depending on specificities of your service/app, you may need to tweak these 
# .. but this should be a good baseline
# Details for these options: https://www.freedesktop.org/software/systemd/man/systemd.exec.html
NoNewPrivileges=yes
PrivateTmp=yes
PrivateDevices=yes
RestrictAddressFamilies=AF_UNIX AF_INET AF_INET6 AF_NETLINK
RestrictNamespaces=yes
RestrictRealtime=yes
DevicePolicy=closed
ProtectSystem=full
ProtectControlGroups=yes
ProtectKernelModules=yes
ProtectKernelTunables=yes
LockPersonality=yes
SystemCallFilter=~@clock @debug @module @mount @obsolete @reboot @setuid @swap

# Denying access to capabilities that should not be relevant for webapps
# Doc: https://man7.org/linux/man-pages/man7/capabilities.7.html
CapabilityBoundingSet=~CAP_RAWIO CAP_MKNOD
CapabilityBoundingSet=~CAP_AUDIT_CONTROL CAP_AUDIT_READ CAP_AUDIT_WRITE
CapabilityBoundingSet=~CAP_SYS_BOOT CAP_SYS_TIME CAP_SYS_MODULE CAP_SYS_PACCT
CapabilityBoundingSet=~CAP_LEASE CAP_LINUX_IMMUTABLE CAP_IPC_LOCK
CapabilityBoundingSet=~CAP_BLOCK_SUSPEND CAP_WAKE_ALARM
CapabilityBoundingSet=~CAP_SYS_TTY_CONFIG
CapabilityBoundingSet=~CAP_MAC_ADMIN CAP_MAC_OVERRIDE
CapabilityBoundingSet=~CAP_NET_ADMIN CAP_NET_BROADCAST CAP_NET_RAW
CapabilityBoundingSet=~CAP_SYS_ADMIN CAP_SYS_PTRACE CAP_SYSLOG

[Install]
WantedBy=multi-user.target