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Reorganize nftables and relax stateful firewall

This commit is contained in:
Alex D. 2022-05-28 14:38:55 +00:00
parent 3e3c7afbd7
commit 55707c2e84
Signed by: caskd
GPG Key ID: F92BA85F61F4C173
9 changed files with 23 additions and 28 deletions
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2
config/nftables/APKBUILD
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@ -3,7 +3,7 @@
. ../APKBUILD-config.template
pkgver=2022.04.03.05
pkgver=2022.05.28.02
pkgrel=0
options="!check" # check requires root?

3
config/nftables/nft/inet/redxenfirewall/filter/input/allowed/dovecot
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@ -1,2 +1 @@
tcp dport 143 counter accept;
tcp dport 993 counter accept;
tcp dport { 143, 993 } counter accept;

4
config/nftables/nft/inet/redxenfirewall/filter/input/allowed/haproxy
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@ -1,3 +1 @@
tcp dport 80 counter accept;
tcp dport 443 counter accept;
tcp dport 2442 counter accept; # Gitea SSH
tcp dport { 80, 443, 2442 } counter accept;

4
config/nftables/nft/inet/redxenfirewall/filter/input/allowed/postfix
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@ -1,3 +1 @@
tcp dport 25 counter accept;
tcp dport 465 counter accept;
tcp dport 587 counter accept;
tcp dport { 25, 465, 587 } counter accept;

3
config/nftables/nft/inet/redxenfirewall/filter/input/blocked/base
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@ -1,3 +0,0 @@
ct state invalid counter drop;
ip saddr @blackhole4 update @blackhole4 { ip saddr timeout 1h } counter reject with icmpx type admin-prohibited;
ip6 saddr @blackhole6 update @blackhole6 { ip6 saddr timeout 1h } counter reject with icmpx type admin-prohibited;

1
config/nftables/nft/inet/redxenfirewall/filter/input/established/base
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@ -1 +0,0 @@
ct state related,established counter accept;

11
config/nftables/nft/inet/redxenfirewall/filter/input/stateful/base
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@ -1,9 +1,6 @@
#iifname "eth0" ct state new meter limit4 { ip saddr ct count over 10 } counter reject;
#iifname "eth0" ct state new meter limit6 { ip6 saddr ct count over 10 } counter reject;
# Ban if connection attempts are still made over the limit
iifname "eth0" ct state new meter ban4 { ip saddr timeout 1h limit rate over 20/minute burst 40 packets } update @blackhole4 { ip saddr timeout 10m } counter reject;
iifname "eth0" ct state new meter ban6 { ip6 saddr timeout 1h limit rate over 20/minute burst 40 packets } update @blackhole6 { ip6 saddr timeout 10m } counter reject;
ct state new meter ban4 { ip saddr timeout 1h limit rate over 1/second burst 10 packets } update @blackhole4 { ip saddr timeout 1h } counter;
ct state new meter ban6 { ip6 saddr timeout 1h limit rate over 1/second burst 10 packets } update @blackhole6 { ip6 saddr timeout 1h } counter;
iifname "eth0" ct state new meter drop4 { ip saddr timeout 5m limit rate over 20/minute } counter reject;
iifname "eth0" ct state new meter drop6 { ip6 saddr timeout 5m limit rate over 20/minute } counter reject;
ct state new meter drop4 { ip saddr timeout 5m limit rate over 1/second } counter reject;
ct state new meter drop6 { ip6 saddr timeout 5m limit rate over 1/second } counter reject;

4
config/nftables/nft/inet/redxenfirewall/filter/input/trusted/base
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@ -1,4 +0,0 @@
iifname "lo" counter accept; # Loopback
iifname "eth1" counter accept; # Private network
icmp type { echo-request } counter accept;
icmpv6 type { nd-neighbor-solicit, echo-request, nd-router-advert, nd-neighbor-advert } counter accept;

19
config/nftables/nft/inet/redxenfirewall/table
View File

@ -12,12 +12,23 @@ table inet redxenfirewall {
chain rxfi {
type filter hook input priority 0;
policy drop;
include "inet/redxenfirewall/filter/input/blocked/*";
include "inet/redxenfirewall/filter/input/trusted/*";
policy accept;
ct state invalid counter drop;
ip saddr @blackhole4 update @blackhole4 { ip saddr timeout 1h } counter reject with icmpx type admin-prohibited;
ip6 saddr @blackhole6 update @blackhole6 { ip6 saddr timeout 1h } counter reject with icmpx type admin-prohibited;
icmp type { echo-request } counter accept;
icmpv6 type { nd-neighbor-solicit, echo-request, nd-router-advert, nd-neighbor-advert } counter accept;
ct state related,established counter accept;
iifname "eth0" jump rxfi-extern;
}
chain rxfi-extern {
include "inet/redxenfirewall/filter/input/stateful/*";
include "inet/redxenfirewall/filter/input/allowed/*";
include "inet/redxenfirewall/filter/input/established/*";
counter reject with icmpx type admin-prohibited;
}