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demo-firewall: add some rules for ipv4

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This commit is contained in:
Daniel Barlow 2024-02-07 23:47:09 +00:00
parent 29e61be26c
commit efb29c5901
1 changed files with 67 additions and 4 deletions
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71
examples/demo-firewall.nix
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@ -35,6 +35,7 @@ in {
(drop "icmpv6 type destination-unreachable ct state invalid,untracked")
];
};
forward-ip6 = {
type = "filter";
family = "ip6";
@ -95,9 +96,12 @@ in {
# recognised (outbound-initiated) flow
(accept "oifname \"int\" iifname \"ppp0\" ct state established,related")
(accept "iifname \"int\" oifname \"ppp0\" ")
"log prefix \"denied forward-ip6 \""
];
};
input-lan = {
input-ip6-lan = {
type = "filter";
family = "ip6";
@ -107,7 +111,7 @@ in {
];
};
input-wan = {
input-ip6-wan = {
type = "filter";
family = "ip6";
@ -123,8 +127,8 @@ in {
hook = "input";
rules = [
(accept "meta l4proto icmpv6")
"iifname int jump input-lan"
"iifname ppp0 jump input-wan"
"iifname int jump input-ip6-lan"
"iifname ppp0 jump input-ip6-wan"
(if allow-incoming
then accept "oifname \"int\" iifname \"ppp0\""
else "oifname \"int\" iifname \"ppp0\" jump incoming-allowed-ip6"
@ -132,6 +136,7 @@ in {
# how does this even make sense in an input chain?
(accept "oifname \"int\" iifname \"ppp0\" ct state established,related")
(accept "iifname \"int\" oifname \"ppp0\" ")
"log prefix \"denied input-ip6 \""
];
};
@ -154,6 +159,7 @@ in {
"oifname \"ppp0\" masquerade"
];
};
nat-rx = {
type = "nat";
hook = "prerouting";
@ -167,4 +173,61 @@ in {
# packet replies. "
];
};
input-ip4-lan = {
type = "filter";
family = "ip";
rules = [
(accept "udp dport 547")
(accept "tcp dport 22")
];
};
input-ip4-wan = {
type = "filter";
family = "ip";
rules = [
];
};
input-ip4 = {
type = "filter";
family = "ip";
policy = "drop";
hook = "input";
rules = [
"iifname lo accept"
"ct state vmap { established : accept, related : accept, invalid : drop }"
"iifname int jump input-ip4-lan"
"iifname ppp0 jump input-ip4-wan"
"oifname \"int\" iifname \"ppp0\" jump incoming-allowed-ip4"
"log prefix \"denied input-ip4 \""
];
};
forward-ip4 = {
type = "filter";
family = "ip";
policy = "drop";
hook = "forward";
rules = [
"iifname \"int\" accept"
"ct state vmap { established : accept, related : accept, invalid : drop }"
"oifname \"int\" iifname \"ppp0\" jump incoming-allowed-ip4"
"log prefix \"denied forward-ip4 \""
];
};
incoming-allowed-ip4 = {
type = "filter";
family = "ip";
rules = [
# this is where you put permitted incoming
# connections. Practically there's not a lot of use for this
# chain unless you have routable ipv4 addresses
];
};
}