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fix nftables syntax

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This commit is contained in:
Daniel Barlow 2023-06-18 22:18:44 +01:00
parent a65bb9d585
commit d66f5901a2
2 changed files with 37 additions and 31 deletions
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9
pkgs/firewallgen/default.nix
View file

@ -31,17 +31,20 @@ let
indent = text : indentLines 0 (splitString "\n" text);
dochain = { name, type, family, rules, policy ? null, hook ? null } : ''
dochain = { name, type, family, rules,
policy ? null,
priority ? "filter",
hook ? null } : ''
chain ${name} {
${if hook != null
then "type ${type} hook ${hook}; policy ${policy};"
then "type ${type} hook ${hook} priority ${priority}; policy ${policy};"
else ""
}
${concatStringsSep "\n" rules}
}
'';
dotable = family : chains : ''
table ${family} ${family} {
table ${family} table-${family} {
${concatStringsSep "\n" (map dochain chains)}
}
'';

57
pkgs/firewallgen/test-rules-min.nix
View file

@ -2,17 +2,17 @@ let
drop = expr : "${expr} drop";
accept = expr : "${expr} accept";
mcast-scope = 8;
allow-incoming = true;
allow-incoming = false;
bogons-ip6 = {
type = "filter";
family = "ip6";
rules = [
(drop "saddr ff00::/8") # multicast saddr is illegal
(drop "ip6 saddr ff00::/8") # multicast saddr is illegal
(drop "saddr ::/128") # unspecified address
(drop "daddr ::/128")
(drop "saddr 2001:db8::/32") # documentation addresses
(drop "daddr 2001:db8::/32")
(drop "ip6 saddr ::/128") # unspecified address
(drop "ip6 daddr ::/128")
(drop "ip6 saddr 2001:db8::/32") # documentation addresses
(drop "ip6 daddr 2001:db8::/32")
# I think this means "check FIB for (saddr, iif) to see if we
# could route a packet to that address using that interface",
@ -39,33 +39,36 @@ let
hook = "forward";
rules = [
"jump bogons-ip6"
(drop "saddr ::1/128") # loopback address [RFC4291]
(drop "daddr ::1/128")
(drop "saddr ::FFFF:0:0/96")# IPv4-mapped addresses
(drop "daddr ::FFFF:0:0/96")
(drop "saddr fe80::/10") # link-local unicast
(drop "daddr fe80::/10")
(drop "saddr fc00::/7") # unique-local addresses
(drop "daddr fc00::/7")
(drop "saddr 2001:10::/28") # ORCHID [RFC4843].
(drop "daddr 2001:10::/28")
(drop "ip6 saddr ::1/128") # loopback address [RFC4291]
(drop "ip6 daddr ::1/128")
(drop "ip6 saddr ::FFFF:0:0/96")# IPv4-mapped addresses
(drop "ip6 daddr ::FFFF:0:0/96")
(drop "ip6 saddr fe80::/10") # link-local unicast
(drop "ip6 daddr fe80::/10")
(drop "ip6 saddr fc00::/7") # unique-local addresses
(drop "ip6 daddr fc00::/7")
(drop "ip6 saddr 2001:10::/28") # ORCHID [RFC4843].
(drop "ip6 daddr 2001:10::/28")
(drop "saddr fc00::/7") # unique local source
(drop "daddr fc00::/7") # and/or dst addresses [RFC4193]
(drop "ip6 saddr fc00::/7") # unique local source
(drop "ip6 daddr fc00::/7") # and/or dst addresses [RFC4193]
# multicast with wrong scopes
(drop
# dest addr first byte 0xff, low nibble of second byte <= scope
# https://www.mankier.com/8/nft#Payload_Expressions-Raw_Payload_Expression
"@nh,192,8 eq 0xff @nh,204,4 le ${toString mcast-scope})")
"@nh,192,8 eq 0xff @nh,204,4 le ${toString mcast-scope}")
(accept "oifname \"int\" iifname \"ppp0\" meta l4proto udp ct state established,related")
(accept "iifname \"int\" oifname \"ppp0\" meta l4proto udp")
(accept "icmpv6")
(accept "ah")
(accept "esp")
(accept "udp port 500") # IKE Protocol [RFC5996]. haha zyxel
(accept "meta l4proto icmpv6")
(accept "meta l4proto ah")
(accept "meta l4proto esp")
# does this ever get used or does the preceding general udp accept
# already grab anything that might get here?
(accept "oifname \"ppp0\" udp dport 500") # IKE Protocol [RFC5996]. haha zyxel
(accept "ip6 nexthdr hip")
## FIXME no support yet for recs 27-30 Mobility Header
@ -84,7 +87,7 @@ let
# accept inbound from the WAN
(if allow-incoming
then accept "oifname \"int\" iifname \"ppp0\""
else { rule = "oifname \"int\" iifname \"ppp0\" jump incoming-allowed-ip6"; }
else "oifname \"int\" iifname \"ppp0\" jump incoming-allowed-ip6"
)
# allow all outbound and any inbound that's part of a
# recognised (outbound-initiated) flow
@ -99,10 +102,10 @@ let
hook = "input";
rules = [
"jump bogons-ip6"
(accept "icmpv6")
(accept "meta l4proto icmpv6")
(if allow-incoming
then accept "oifname \"int\" iifname \"ppp0\""
else { rule = "oifname \"int\" iifname \"ppp0\" jump incoming-allowed-ip6"; }
else "oifname \"int\" iifname \"ppp0\" jump incoming-allowed-ip6"
)
(accept "oifname \"int\" iifname \"ppp0\" ct state established,related")
(accept "iifname \"int\" oifname \"ppp0\" ")
@ -113,7 +116,7 @@ let
type = "filter";
family = "ip6";
rules = [
"oifname \"int\" tcp port 22 daddr loaclhost.lan"
"oifname \"int\" ip6 daddr 2001:8b0:de3a:40de::e9d tcp dport 22"
];
};
in {