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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") (drop "icmpv6 type destination-unreachable ct state invalid,untracked")
]; ];
}; };
forward-ip6 = { forward-ip6 = {
type = "filter"; type = "filter";
family = "ip6"; family = "ip6";
@ -95,9 +96,12 @@ in {
# recognised (outbound-initiated) flow # recognised (outbound-initiated) flow
(accept "oifname \"int\" iifname \"ppp0\" ct state established,related") (accept "oifname \"int\" iifname \"ppp0\" ct state established,related")
(accept "iifname \"int\" oifname \"ppp0\" ") (accept "iifname \"int\" oifname \"ppp0\" ")
"log prefix \"denied forward-ip6 \""
]; ];
}; };
input-lan = {
input-ip6-lan = {
type = "filter"; type = "filter";
family = "ip6"; family = "ip6";
@ -107,7 +111,7 @@ in {
]; ];
}; };
input-wan = { input-ip6-wan = {
type = "filter"; type = "filter";
family = "ip6"; family = "ip6";
@ -123,8 +127,8 @@ in {
hook = "input"; hook = "input";
rules = [ rules = [
(accept "meta l4proto icmpv6") (accept "meta l4proto icmpv6")
"iifname int jump input-lan" "iifname int jump input-ip6-lan"
"iifname ppp0 jump input-wan" "iifname ppp0 jump input-ip6-wan"
(if allow-incoming (if allow-incoming
then accept "oifname \"int\" iifname \"ppp0\"" then accept "oifname \"int\" iifname \"ppp0\""
else "oifname \"int\" iifname \"ppp0\" jump incoming-allowed-ip6" else "oifname \"int\" iifname \"ppp0\" jump incoming-allowed-ip6"
@ -132,6 +136,7 @@ in {
# how does this even make sense in an input chain? # how does this even make sense in an input chain?
(accept "oifname \"int\" iifname \"ppp0\" ct state established,related") (accept "oifname \"int\" iifname \"ppp0\" ct state established,related")
(accept "iifname \"int\" oifname \"ppp0\" ") (accept "iifname \"int\" oifname \"ppp0\" ")
"log prefix \"denied input-ip6 \""
]; ];
}; };
@ -154,6 +159,7 @@ in {
"oifname \"ppp0\" masquerade" "oifname \"ppp0\" masquerade"
]; ];
}; };
nat-rx = { nat-rx = {
type = "nat"; type = "nat";
hook = "prerouting"; hook = "prerouting";
@ -167,4 +173,61 @@ in {
# packet replies. " # 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
];
};
} }