35 lines
1.6 KiB
Bash
35 lines
1.6 KiB
Bash
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#!/usr/bin/env bash
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# Apply the claudebox host-firewall rules. Idempotent; runs as root.
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# Invoked by setup-host.sh at install time and by claudebox-firewall.service
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# at every boot (UFW rules persist on their own; the nft fallback table and
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# Docker's DOCKER-USER rules are runtime-only and need re-applying).
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set -euo pipefail
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GW=10.87.0.1
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NET=claudenet
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if command -v ufw >/dev/null && ufw status 2>/dev/null | grep -q "Status: active"; then
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if ! ufw status | grep "on $NET" | grep -q "DENY"; then
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ufw insert 1 deny in on "$NET"
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ufw insert 1 allow in on "$NET" to "$GW" port 53 proto tcp
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ufw insert 1 allow in on "$NET" to "$GW" port 53 proto udp
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ufw insert 1 allow in on "$NET" to any port 67 proto udp
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ufw route allow in on "$NET"
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fi
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else
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# No UFW: protect the host's own sockets with a dedicated nft table.
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if ! nft list table inet claudebox >/dev/null 2>&1; then
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nft add table inet claudebox
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nft 'add chain inet claudebox input { type filter hook input priority -5 ; }'
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nft add rule inet claudebox input iifname "$NET" udp dport '{ 53, 67 }' accept
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nft add rule inet claudebox input iifname "$NET" tcp dport 53 accept
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nft add rule inet claudebox input iifname "$NET" drop
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fi
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fi
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# Docker rewrites FORWARD policy to DROP; DOCKER-USER is its escape hatch.
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if command -v docker >/dev/null && iptables -L DOCKER-USER -n >/dev/null 2>&1; then
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iptables -C DOCKER-USER -i "$NET" -j ACCEPT 2>/dev/null || iptables -I DOCKER-USER -i "$NET" -j ACCEPT
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iptables -C DOCKER-USER -o "$NET" -j ACCEPT 2>/dev/null || iptables -I DOCKER-USER -o "$NET" -j ACCEPT
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fi
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