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router: small port 25 changes

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technically this is relevant for security since it blocks requests to
port 25 over ipv6 from clients other than the server, but it doesn't
matter on my network because i don't have ipv6
This commit is contained in:
chayleaf 2023-08-13 16:40:21 +07:00
parent fc95bb1e97
commit 4f650b2091
1 changed files with 20 additions and 17 deletions
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37
system/hosts/router/default.nix
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@ -58,6 +58,15 @@ let
else if rule.target4.address or null == netAddresses.lan4 || rule.target6.address or null == netAddresses.lan6 then "rule"
else "mark";
dnatRuleProtos = rule:
let
inherit (notnft.inetProtos) tcp udp;
in
if rule.tcp && rule.udp then notnft.dsl.set [ tcp udp ]
else if rule.tcp then tcp
else if rule.udp then udp
else throw "Invalid rule: either tcp or udp must be set";
# nftables rules generator
# selfIp4/selfIp6 = block packets from these addresses
# extraInetEntries = stuff to add to inet table
@ -463,8 +472,7 @@ in {
inetDnatRules =
builtins.concatLists (map
(rule: let
inherit (notnft.inetProtos) tcp udp;
protocols = if rule.tcp && rule.udp then notnft.dsl.set [ tcp udp ] else if rule.tcp then tcp else udp;
protocols = dnatRuleProtos rule;
rule4 = rule.target4; rule6 = rule.target6;
in with notnft.dsl; with payload;
lib.optionals (rule4 != null) [
@ -521,22 +529,20 @@ in {
[(is.eq ip6.daddr "@force_unvpn6") (mangle meta.mark wan_table)]
[(is.eq ip.saddr "@force_unvpn4") (mangle meta.mark wan_table)]
[(is.eq ip6.saddr "@force_unvpn6") (mangle meta.mark wan_table)]
# block requests to port 25 from hosts other than the server so they can't send mail pretending to originate from my domain
# only do this for br0 since other adapters aren't forwarded from
[(is.eq meta.iifname "br0") (is.ne ether.saddr cfg.serverMac) (is.eq ip.protocol (f: f.tcp)) (is.eq tcp.dport 25) (log "smtp ") drop]
# don't vpn smtp requests so spf works fine (and in case the vpn blocks requests over port 25, which it usually does)
[(is.eq ip.protocol (f: f.tcp)) (is.eq tcp.dport 25) (mangle meta.mark wan_table)]
[(is.eq ip6.nexthdr (f: f.tcp)) (is.eq tcp.dport 25) (mangle meta.mark wan_table)]
# finally, force vpn to/from force_vpn4/force_vpn6 even if we previously decided to unvpn this connection
# force vpn to/from force_vpn4/force_vpn6 even if we previously decided to unvpn this connection
[(is.eq ip.daddr "@force_vpn4") (mangle meta.mark vpn_table)]
[(is.eq ip6.daddr "@force_vpn6") (mangle meta.mark vpn_table)]
[(is.eq ip.saddr "@force_vpn4") (mangle meta.mark vpn_table)]
[(is.eq ip6.saddr "@force_vpn6") (mangle meta.mark vpn_table)]
# block requests to port 25 from hosts other than the server so they can't send mail pretending to originate from my domain
# only do this for br0 since traffic from other interfaces isn't forwarded to wan
[(is.eq meta.iifname "br0") (is.ne ether.saddr cfg.serverMac) (is.eq meta.l4proto (f: f.tcp)) (is.eq tcp.dport 25) (log "smtp ") drop]
# don't vpn smtp requests so spf works fine (and in case the vpn blocks requests over port 25, which it usually does)
[(is.eq meta.l4proto (f: f.tcp)) (is.eq tcp.dport 25) (mangle meta.mark wan_table)]
] ++ # 1. dnat non-vpn: change rttable to wan
builtins.concatLists (map
(rule: let
inherit (notnft.inetProtos) tcp udp;
protocols = if rule.tcp && rule.udp then notnft.dsl.set [ tcp udp ] else if rule.tcp then tcp else udp;
protocols = dnatRuleProtos rule;
rule4 = rule.target4; rule6 = rule.target6;
in with notnft.dsl; with payload;
lib.optionals (rule4 != null) [
@ -550,8 +556,7 @@ in {
++ # 2. dnat vpn: change rttable to vpn
builtins.concatLists (map
(rule: let
inherit (notnft.inetProtos) tcp udp;
protocols = if rule.tcp && rule.udp then notnft.dsl.set [ tcp udp ] else if rule.tcp then tcp else udp;
protocols = dnatRuleProtos rule;
rule4 = rule.target4; rule6 = rule.target6;
in with notnft.dsl; with payload;
lib.optionals (rule4 != null) [
@ -640,8 +645,7 @@ in {
inetDnatRules =
builtins.concatLists (map
(rule: let
inherit (notnft.inetProtos) tcp udp;
protocols = if rule.tcp && rule.udp then notnft.dsl.set [ tcp udp ] else if rule.tcp then tcp else udp;
protocols = dnatRuleProtos rule;
rule4 = rule.target4; rule6 = rule.target6;
in with notnft.dsl; with payload;
lib.optionals (rule4 != null) [
@ -657,8 +661,7 @@ in {
# if i ever need this again, i have it right here
builtins.concatLists (map
(rule: let
inherit (notnft.inetProtos) tcp udp;
protocols = if rule.tcp && rule.udp then notnft.dsl.set [ tcp udp ] else if rule.tcp then tcp else udp;
protocols = dnatRuleProtos rule;
rule4 = rule.target4; rule6 = rule.target6;
in with notnft.dsl; with payload;
lib.optionals (rule4 != null) [