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fix(security): bind fleetcrown to localhost only, not every interface #437

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github-actions merged 1 commit into from
Aug 29, 2026
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fix(security): bind fleetcrown to localhost only, not every interface #437

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13 changes: 10 additions & 3 deletions scripts/fleetcrown-app.sh
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Original file line number Diff line number Diff line change
Expand Up @@ -28,9 +28,16 @@ fi

# Defaults for production server — override in .env.local if needed.
export PORT="${PORT:-3000}"
# HOSTNAME is a bash builtin (set to machine name) — unset it so the standalone
# server defaults to 0.0.0.0 and is reachable at 127.0.0.1 / localhost.
unset HOSTNAME
# HOSTNAME is a bash builtin (set to the machine name, e.g. "bitbaum") and
# Next's standalone server reads it as the bind address. `unset` does NOT
# make that default to localhost — it makes Next fall back to ITS OWN
# default, which is 0.0.0.0 (every interface). Found 2026-08-29: this left
# fleetcrown reachable on all interfaces (mitigated only by ufw's
# default-deny, which happened to block the port anyway — not something to
# rely on). Every other app in the fleet already does this correctly via
# sync-infra.sh's `HOSTNAME=127.0.0.1`; fleetcrown just never matched its
# own convention because it launches itself outside that shared script.
export HOSTNAME=127.0.0.1
# NEXTAUTH_URL must match the local URL so auth callbacks work.
export NEXTAUTH_URL="${NEXTAUTH_URL:-http://localhost:${PORT}}"
export NEXTAUTH_SECRET="${NEXTAUTH_SECRET:-${AUTH_SECRET:-}}"
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