41 lines
1.8 KiB
Bash
Executable file
41 lines
1.8 KiB
Bash
Executable file
#!/usr/bin/env bash
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# Locks the Swarm ports (2377 control, 7946 gossip, 4789 overlay VXLAN) to the
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# WireGuard interface only — they must never be reachable from the public
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# internet. Run on BOTH boxes after joining the swarm. Existing app-facing
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# rules (80/443, SSH, etc.) are untouched.
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set -euo pipefail
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WG_IFACE="${WG_IFACE:-wg0}"
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if ! command -v ufw >/dev/null 2>&1; then
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echo "ufw not found — apply the equivalent iptables/nftables rules by hand:" >&2
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echo " allow 2377/tcp, 7946/tcp, 7946/udp, 4789/udp only on interface ${WG_IFACE}" >&2
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echo " deny 2377/tcp, 7946/tcp, 7946/udp, 4789/udp on every other interface" >&2
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exit 1
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fi
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echo "==> Allowing Swarm ports on ${WG_IFACE} only"
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ufw allow in on "$WG_IFACE" to any port 2377 proto tcp
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ufw allow in on "$WG_IFACE" to any port 7946 proto tcp
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ufw allow in on "$WG_IFACE" to any port 7946 proto udp
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ufw allow in on "$WG_IFACE" to any port 4789 proto udp
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echo "==> Explicitly denying the same ports on every other interface"
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ufw deny 2377/tcp
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ufw deny 7946/tcp
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ufw deny 7946/udp
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ufw deny 4789/udp
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echo
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echo "Rules added (not yet necessarily active — check ufw status):"
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ufw status numbered | grep -E "2377|7946|4789|Status" || true
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echo
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if ! ufw status | grep -q "^Status: active"; then
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echo "ufw is currently INACTIVE on this node — 'ufw enable' switches its"
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echo "default policy to deny-incoming for EVERYTHING, not just the Swarm"
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echo "ports above. Before enabling, explicitly allow every port this node"
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echo "already serves publicly (SSH at minimum; on beta specifically, also"
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echo "80/tcp and 443/tcp for the live thermograph.org Caddy) — check"
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echo "'ss -tlnp' for what's actually listening first. Enabling ufw without"
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echo "doing this WILL drop live traffic the moment it activates."
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fi
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