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move mail server HTTP(S) connection limit to nftables

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This has the same reasoning as 9fcac6b105
other than these services being used for MTA-STS in addition to ACME and
redirects to the FAQ for the domains.
This commit is contained in:
Daniel Micay 2024-04-01 19:40:46 -04:00
parent 83bcc0b327
commit 3e23b80e9c
1 changed files with 19 additions and 5 deletions
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24
nftables-mail.conf
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@ -21,6 +21,16 @@ table inet filter {
flags dynamic
}
set ip-connlimit-http {
type ipv4_addr
flags dynamic
}
set ip6-connlimit-http {
type ipv6_addr
flags dynamic
}
chain prerouting-raw {
type filter hook prerouting priority raw
@ -32,8 +42,8 @@ table inet filter {
# drop packets to address not configured on incoming interface (strong host model)
fib daddr . iif type != { local, broadcast, multicast } counter drop
tcp dport { 25, 80, 443, 465, 993 } notrack accept
tcp dport 22 tcp flags syn notrack accept
tcp dport { 25, 465, 993 } notrack accept
tcp dport { 22, 80, 443 } tcp flags syn notrack accept
meta l4proto { icmp, ipv6-icmp } notrack accept
}
@ -41,7 +51,7 @@ table inet filter {
type filter hook output priority raw
oif lo notrack accept
tcp sport { 25, 80, 443, 465, 993 } notrack accept
tcp sport { 25, 465, 993 } notrack accept
meta l4proto { icmp, ipv6-icmp } notrack accept
}
@ -50,18 +60,22 @@ table inet filter {
policy drop
iif lo goto input-loopback
tcp dport { 25, 80, 443, 465, 993 } accept
tcp dport { 25, 465, 993 } accept
meta l4proto { icmp, ipv6-icmp } accept
ct state vmap { established : accept, related : accept, new : goto graceful-reject }
tcp dport 22 ip saddr @ip-connlimit-ssh counter reject with tcp reset
tcp dport 22 ip6 saddr and ffff:ffff:ffff:ffff:ffff:: @ip6-connlimit-ssh counter reject with tcp reset
tcp dport 22 synproxy mss 1460 wscale 7 timestamp sack-perm
tcp dport { 80, 443 } ip saddr @ip-connlimit-http counter reject with tcp reset
tcp dport { 80, 443 } ip6 saddr and ffff:ffff:ffff:ffff:: @ip6-connlimit-http counter reject with tcp reset
tcp dport { 22, 80, 443 } synproxy mss 1460 wscale 7 timestamp sack-perm
}
chain input-loopback {
tcp dport 22 tcp flags syn ip saddr != $ip-allowlist-ssh add @ip-connlimit-ssh { ip saddr ct count over 1 } counter reject with tcp reset
tcp dport 22 tcp flags syn ip6 saddr != $ip6-allowlist-ssh add @ip6-connlimit-ssh { ip6 saddr and ffff:ffff:ffff:ffff:ffff:: ct count over 1 } counter reject with tcp reset
tcp dport { 80, 443 } tcp flags syn add @ip-connlimit-http { ip saddr ct count over 32 } counter reject with tcp reset
tcp dport { 80, 443 } tcp flags syn add @ip6-connlimit-http { ip6 saddr and ffff:ffff:ffff:ffff:: ct count over 32 } counter reject with tcp reset
accept
}