[pull] master from angristan:master#104
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…#1426) ## Summary - Fixes firewall rules that hardcode `tun0` interface, which fails when OpenVPN uses `tun1`, `tun2`, etc. because another service already occupies `tun0` - Uses a defense-in-depth approach combining interface wildcard matching with source-based rules to prevent IP spoofing Fixes #1298 ## Changes | Backend | Before | After | |---------|--------|-------| | **iptables** | `-i tun0` | `-i tun+ -s $VPN_SUBNET` | | **nftables** | `iifname "tun0"` | `iifname "tun*" ip saddr $VPN_SUBNET` | | **firewalld** | rich rules (source-based) | no change needed | ## Implementation Details - **iptables/nftables**: Combined interface wildcard (`tun+`/`tun*`) with source matching provides defense in depth - traffic must come from both a tun interface AND the VPN subnet - **firewalld**: Already used source-based rich rules, so no changes required (rich rules work reliably across both iptables and nftables backends)
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