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The disappearance of the eth0 interface when you restart the net qube of the sys-firewall or set it’s net qube to none is causing `iif == "eth0"` to become `iif 2` and the rules won't work anymore.
It’s better to use `iifgroup 1` instead of `iif == "eth0"`.
Related discussion:
https://forum.qubes-os.org/t/iptables-not-available-in-sys-net-in-qubes-os-4-2-1/26706/26
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apparatius 2024-07-12 09:31:11 +00:00 • committed by GitHub
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user/security-in-qubes/firewall.md
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@ -297,13 +297,13 @@ nft add chain qubes custom-dnat-qubeDEST '{ type nat hook prerouting priority fi
Second step, code a natting firewall rule to route traffic on the outside interface for the service to the sys-firewall VM Second step, code a natting firewall rule to route traffic on the outside interface for the service to the sys-firewall VM
``` ```
nft add rule qubes custom-dnat-qubeDEST iif == "ens6" ip saddr 192.168.x.y/24 tcp dport 443 ct state new,established,related counter dnat 10.137.1.z nft add rule qubes custom-dnat-qubeDEST iifgroup 1 ip saddr 192.168.x.y/24 tcp dport 443 ct state new,established,related counter dnat 10.137.1.z
``` ```
Third step, code the appropriate new filtering firewall rule to allow new connections for the service Third step, code the appropriate new filtering firewall rule to allow new connections for the service
``` ```
nft add rule qubes custom-forward iif == "ens6" ip saddr 192.168.x.y/24 ip daddr 10.137.1.z tcp dport 443 ct state new,established,related counter accept nft add rule qubes custom-forward iifgroup 1 ip saddr 192.168.x.y/24 ip daddr 10.137.1.z tcp dport 443 ct state new,established,related counter accept
``` ```
> Note: If you do not wish to limit the IP addresses connecting to the service, remove `ip saddr 192.168.x.y/24` from the rules > Note: If you do not wish to limit the IP addresses connecting to the service, remove `ip saddr 192.168.x.y/24` from the rules
@ -320,12 +320,12 @@ In this example, we can see 7 packets in the forward rule, and 3 packets in the
``` ```
chain custom-forward { chain custom-forward {
iif "ens6" ip saddr 192.168.x.y/24 ip daddr 10.137.1.z tcp dport 443 ct state new,established,related counter packets 7 bytes 448 accept iifgroup 1 ip saddr 192.168.x.y/24 ip daddr 10.137.1.z tcp dport 443 ct state new,established,related counter packets 7 bytes 448 accept
} }
chain custom-dnat-qubeDEST { chain custom-dnat-qubeDEST {
type nat hook prerouting priority filter + 1; policy accept; type nat hook prerouting priority filter + 1; policy accept;
iif "ens6" ip saddr 192.168.x.y/24 tcp dport 443 ct state new,established,related counter packets 3 bytes 192 dnat to 10.138.33.59 iifgroup 1 ip saddr 192.168.x.y/24 tcp dport 443 ct state new,established,related counter packets 3 bytes 192 dnat to 10.138.33.59
} }
``` ```
@ -351,10 +351,10 @@ Content of `/rw/config/qubes-firewall-user-script` in `sys-net`:
if nft add chain qubes custom-dnat-qubeDEST '{ type nat hook prerouting priority filter +1 ; policy accept; }' if nft add chain qubes custom-dnat-qubeDEST '{ type nat hook prerouting priority filter +1 ; policy accept; }'
then then
# create the dnat rule # create the dnat rule
nft add rule qubes custom-dnat-qubeDEST iif == "ens6" saddr 192.168.x.y/24 tcp dport 443 ct state new,established,related counter dnat 10.137.1.z nft add rule qubes custom-dnat-qubeDEST iifgroup 1 saddr 192.168.x.y/24 tcp dport 443 ct state new,established,related counter dnat 10.137.1.z
# allow forwarded traffic # allow forwarded traffic
nft add rule qubes custom-forward iif == "ens6" ip saddr 192.168.x.y/24 ip daddr 10.137.1.z tcp dport 443 ct state new,established,related counter accept nft add rule qubes custom-forward iifgroup 1 ip saddr 192.168.x.y/24 ip daddr 10.137.1.z tcp dport 443 ct state new,established,related counter accept
fi fi
~~~ ~~~
@ -371,13 +371,13 @@ nft add chain qubes custom-dnat-qubeDEST '{ type nat hook prerouting priority fi
Second step, code a natting firewall rule to route traffic on the outside interface for the service to the destination qube Second step, code a natting firewall rule to route traffic on the outside interface for the service to the destination qube
``` ```
nft add rule qubes custom-dnat-qubeDEST iif == "eth0" ip saddr 192.168.x.y/24 tcp dport 443 ct state new,established,related counter dnat 10.137.0.xx nft add rule qubes custom-dnat-qubeDEST iifgroup 1 ip saddr 192.168.x.y/24 tcp dport 443 ct state new,established,related counter dnat 10.137.0.xx
``` ```
Third step, code the appropriate new filtering firewall rule to allow new connections for the service Third step, code the appropriate new filtering firewall rule to allow new connections for the service
``` ```
nft add rule qubes custom-forward iif == "eth0" ip saddr 192.168.x.y/24 ip daddr 10.137.0.xx tcp dport 443 ct state new,established,related counter accept nft add rule qubes custom-forward iifgroup 1 ip saddr 192.168.x.y/24 ip daddr 10.137.0.xx tcp dport 443 ct state new,established,related counter accept
``` ```
> Note: If you do not wish to limit the IP addresses connecting to the service, remove `ip saddr 192.168.x.y/24` from the rules > Note: If you do not wish to limit the IP addresses connecting to the service, remove `ip saddr 192.168.x.y/24` from the rules
@ -398,10 +398,10 @@ Content of `/rw/config/qubes-firewall-user-script` in `sys-firewall`:
if nft add chain qubes custom-dnat-qubeDEST '{ type nat hook prerouting priority filter +1 ; policy accept; }' if nft add chain qubes custom-dnat-qubeDEST '{ type nat hook prerouting priority filter +1 ; policy accept; }'
then then
# create the dnat rule # create the dnat rule
nft add rule qubes custom-dnat-qubeDEST iif == "eth0" tcp dport 443 ct state new,established,related counter dnat 10.137.0.xx nft add rule qubes custom-dnat-qubeDEST iifgroup 1 tcp dport 443 ct state new,established,related counter dnat 10.137.0.xx
# allow forwarded traffic # allow forwarded traffic
nft add rule qubes custom-forward iif == "eth0" ip saddr 192.168.x.y/24 ip daddr 10.137.0.xx tcp dport 443 ct state new,established,related counter accept nft add rule qubes custom-forward iifgroup 1 ip saddr 192.168.x.y/24 ip daddr 10.137.0.xx tcp dport 443 ct state new,established,related counter accept
fi fi
~~~ ~~~