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servo: net: forward http requests from vpn -> host w/o NATing the source address

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this ensures we have access to the source IP in our host-side logs
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colin
2022-12-12 05:21:29 +00:00
parent d0e6b82739
commit acabd34f28
1 changed files with 9 additions and 6 deletions
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15
hosts/servo/net.nix
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@@ -130,16 +130,19 @@
# this exists so LetsEncrypt can procure a cert for the MX over http.
# TODO: we could use _acme_challence.mx.uninsane.org CNAME to avoid this forwarding
# - <https://community.letsencrypt.org/t/where-does-letsencrypt-resolve-dns-from/37607/8>
${in-ns} ${iptables} -A PREROUTING -t nat -p tcp --dport 80 -j DNAT --to-destination ${veth-host-ip}:80
${in-ns} ${iptables} -A POSTROUTING -t nat -p tcp --dport 80 -j SNAT --to-source ${veth-local-ip}
${in-ns} ${iptables} -A PREROUTING -t nat -p tcp --dport 80 -m iprange --dst-range ${vpn-ip} \
-j DNAT --to-destination ${veth-host-ip}:80
# we also bridge DNS traffic (TODO: figure out why TCP doesn't work. do we need to rewrite the source addr?)
${in-ns} ${iptables} -A PREROUTING -t nat -p udp --dport 53 -m iprange --dst-range ${vpn-ip} -j DNAT --to-destination ${veth-host-ip}:53
${in-ns} ${iptables} -A PREROUTING -t nat -p tcp --dport 53 -m iprange --dst-range ${vpn-ip} -j DNAT --to-destination ${veth-host-ip}:53
# we also bridge DNS traffic
${in-ns} ${iptables} -A PREROUTING -t nat -p udp --dport 53 -m iprange --dst-range ${vpn-ip} \
-j DNAT --to-destination ${veth-host-ip}:53
${in-ns} ${iptables} -A PREROUTING -t nat -p tcp --dport 53 -m iprange --dst-range ${vpn-ip} \
-j DNAT --to-destination ${veth-host-ip}:53
# in order to access DNS in this netns, we need to route it to the VPN's nameservers
# - alternatively, we could fix DNS servers like 1.1.1.1.
${in-ns} ${iptables} -A OUTPUT -t nat -p udp --dport 53 -m iprange --dst-range 127.0.0.53 -j DNAT --to-destination ${vpn-dns}:53
${in-ns} ${iptables} -A OUTPUT -t nat -p udp --dport 53 -m iprange --dst-range 127.0.0.53 \
-j DNAT --to-destination ${vpn-dns}:53
'';
};