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Make nftables rules more relaxed and close outbound connections early

This commit is contained in:
Alex D. 2021-07-09 11:00:40 +00:00
parent fd4a6252f0
commit 1c38c257a9
Signed by: caskd
GPG Key ID: F92BA85F61F4C173
6 changed files with 13 additions and 11 deletions
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2
config/nftables/APKBUILD
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@ -3,7 +3,7 @@
. ../APKBUILD-config.template
pkgver=2021.06.20.04
pkgver=2021.07.04.02
pkgrel=0
options="!check" # check requires root?

4
config/nftables/nft/inet/redxenfirewall/filter/input/stateful/base
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@ -1,2 +1,2 @@
ct state new iifname "eth0" meter global4 { ip saddr timeout 1m limit rate over 1/second burst 50 packets } add @blackhole4 { ip saddr } counter;
ct state new iifname "eth0" meter global6 { ip6 saddr timeout 1m limit rate over 1/second burst 50 packets } add @blackhole6 { ip6 saddr } counter;
ct state new iifname "eth0" meter global4 { ip saddr timeout 10m limit rate over 1/second burst 50 packets } update @blackhole4 { ip saddr } counter;
ct state new iifname "eth0" meter global6 { ip6 saddr timeout 10m limit rate over 1/second burst 50 packets } update @blackhole6 { ip6 saddr } counter;

4
config/nftables/nft/inet/redxenfirewall/filter/input/stateful/dovecot
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@ -1,2 +1,2 @@
tcp dport { 143, 993 } ct state new meter dovecot4 { ip saddr timeout 1m limit rate over 4/minute burst 10 packets } add @blackhole4 { ip saddr } counter;
tcp dport { 143, 993 } ct state new meter dovecot6 { ip6 saddr timeout 1m limit rate over 4/minute burst 10 packets } add @blackhole6 { ip6 saddr } counter;
tcp dport { 143, 993 } ct state new meter dovecot4 { ip saddr timeout 10m limit rate over 4/minute burst 10 packets } update @blackhole4 { ip saddr } counter;
tcp dport { 143, 993 } ct state new meter dovecot6 { ip6 saddr timeout 10m limit rate over 4/minute burst 10 packets } update @blackhole6 { ip6 saddr } counter;

4
config/nftables/nft/inet/redxenfirewall/filter/input/stateful/postfix
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@ -1,2 +1,2 @@
tcp dport { 25, 465, 587 } ct state new meter postfix4 { ip saddr timeout 1m limit rate over 4/minute burst 20 packets } add @blackhole4 { ip saddr } counter;
tcp dport { 25, 465, 587 } ct state new meter postfix6 { ip6 saddr timeout 1m limit rate over 4/minute burst 20 packets } add @blackhole6 { ip6 saddr } counter;
tcp dport { 25, 465, 587 } ct state new meter postfix4 { ip saddr timeout 10m limit rate over 4/minute burst 20 packets } update @blackhole4 { ip saddr } counter;
tcp dport { 25, 465, 587 } ct state new meter postfix6 { ip6 saddr timeout 10m limit rate over 4/minute burst 20 packets } update @blackhole6 { ip6 saddr } counter;

2
config/nftables/nft/inet/redxenfirewall/filter/output/base Normal file
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@ -0,0 +1,2 @@
ip daddr @blackhole4 counter reject;
ip6 daddr @blackhole6 counter reject;

8
config/nftables/nft/inet/redxenfirewall/table
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@ -2,14 +2,14 @@ table inet redxenfirewall {
set blackhole4 {
type ipv4_addr;
timeout 4h;
flags timeout;
timeout 1h;
flags dynamic, timeout;
}
set blackhole6 {
type ipv6_addr;
timeout 4h;
flags timeout;
timeout 1h;
flags dynamic, timeout;
}
chain rxfi {