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feat(vpn): add tenant isolation iptables rules to forwarding script

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Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
This commit is contained in:
Jason Staack
2026-03-14 16:24:38 -05:00
parent b27b0fc946
commit 3330f2a62f
1 changed files with 17 additions and 0 deletions
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17
docker-data/wireguard/custom-cont-init.d/10-forwarding.sh Executable file
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#!/bin/sh
# Enable forwarding between Docker network and WireGuard tunnel
# Idempotent: check before adding to prevent duplicates on restart
iptables -C FORWARD -i eth0 -o wg0 -j ACCEPT 2>/dev/null || iptables -A FORWARD -i eth0 -o wg0 -j ACCEPT
iptables -C FORWARD -i wg0 -o eth0 -j ACCEPT 2>/dev/null || iptables -A FORWARD -i wg0 -o eth0 -j ACCEPT
# Block cross-subnet traffic on wg0 (tenant isolation)
# Peers in 10.10.1.0/24 cannot reach peers in 10.10.2.0/24
iptables -C FORWARD -i wg0 -o wg0 -j DROP 2>/dev/null || iptables -A FORWARD -i wg0 -o wg0 -j DROP
# Block IPv6 forwarding on wg0 (prevent link-local bypass)
ip6tables -C FORWARD -i wg0 -j DROP 2>/dev/null || ip6tables -A FORWARD -i wg0 -j DROP
# NAT for return traffic
iptables -t nat -C POSTROUTING -o wg0 -j MASQUERADE 2>/dev/null || iptables -t nat -A POSTROUTING -o wg0 -j MASQUERADE
echo "WireGuard forwarding and tenant isolation rules applied"