Files
hermes-bot/pi/nftables-robot.nft
T
kyleandClaude Sonnet 5.5 2535344f3d Restrict the robot's service ports to the USB link
Audio (4713), MCP (8765) and the face webhook (8766) are accepted only on usb0
from 10.55.0.1 and dropped on every other interface, Wi-Fi included. SSH is left
open on all interfaces for V2, by the owner's decision. Tested on the Pi with
throwaway listeners: 8765 answers over usb0 and is unreachable over Wi-Fi, while
a control port answers on both.

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01AFN8nRRCiDiMN7ChBpHJhs
2026-10-04 21:07:38 -07:00

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#!/usr/sbin/nft -f
# The robot's audio (4713), MCP (8765) and face webhook (8766) ports are reachable only over the
# USB link, and only from the host at 10.55.0.1. Every other interface, Wi-Fi included, is dropped.
# SSH and everything else are left alone: that policy is the owner's call.
table inet robot
delete table inet robot
table inet robot {
chain input {
type filter hook input priority 0; policy accept;
iif "lo" accept
iifname "usb0" ip saddr 10.55.0.1 tcp dport { 4713, 8765, 8766 } accept
tcp dport { 4713, 8765, 8766 } drop
}
}