tv: modularize iptables configuration
This commit is contained in:
tv
parent
1538630782
commit
53305dc496
@ -8,7 +8,6 @@ in
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imports =
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[
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<secrets/hashedPasswords.nix>
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./iptables.nix
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./networking.nix
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./users.nix
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../common/nixpkgs.nix
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@ -19,6 +18,22 @@ in
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../tv/git/public.nix
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../tv/retiolum.nix
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../tv/sanitize.nix
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{
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imports = [ ../tv/iptables ];
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tv.iptables = {
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enable = true;
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input-internet-accept-new-tcp = [
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"ssh"
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"tinc"
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"smtp"
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"xmpp-client"
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"xmpp-server"
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];
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input-retiolum-accept-new-tcp = [
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"http"
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];
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};
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}
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];
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# "Developer 2" plan has two vCPUs.
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@ -1,76 +0,0 @@
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{ config, pkgs, ... }:
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{
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#
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# iptables
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#
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networking.firewall.enable = false;
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system.activationScripts.iptables =
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let
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log = false;
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when = c: f: if c then f else "";
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in
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''
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ip4tables() { ${pkgs.iptables}/sbin/iptables "$@"; }
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ip6tables() { ${pkgs.iptables}/sbin/ip6tables "$@"; }
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ipXtables() { ip4tables "$@" && ip6tables "$@"; }
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# XXX This fails with the original CAC CentOS 7 kernel.
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if ipXtables -vL >/dev/null; then
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#
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# nat
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#
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# reset tables
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ipXtables -t nat -F
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ipXtables -t nat -X
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#
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ipXtables -t nat -A PREROUTING -j REDIRECT ! -i retiolum -p tcp --dport ssh --to-ports 0
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ipXtables -t nat -A PREROUTING -j REDIRECT -p tcp --dport 11423 --to-ports ssh
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#
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# filter
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#
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# reset tables
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ipXtables -P INPUT DROP
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ipXtables -P FORWARD DROP
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ipXtables -F
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ipXtables -X
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# create custom chains
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ipXtables -N Retiolum
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# INPUT
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ipXtables -A INPUT -j ACCEPT -m conntrack --ctstate RELATED,ESTABLISHED
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ipXtables -A INPUT -j ACCEPT -i lo
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ipXtables -A INPUT -j ACCEPT -p tcp --dport ssh -m conntrack --ctstate NEW
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#ipXtables -A INPUT -j ACCEPT -p tcp --dport http -m conntrack --ctstate NEW
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ipXtables -A INPUT -j ACCEPT -p tcp --dport tinc -m conntrack --ctstate NEW
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ipXtables -A INPUT -j ACCEPT -p tcp --dport smtp -m conntrack --ctstate NEW
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ipXtables -A INPUT -j ACCEPT -p tcp --dport xmpp-client -m conntrack --ctstate NEW
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ipXtables -A INPUT -j ACCEPT -p tcp --dport xmpp-server -m conntrack --ctstate NEW
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ipXtables -A INPUT -j Retiolum -i retiolum
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${when log "ipXtables -A INPUT -j LOG --log-level info --log-prefix 'INPUT DROP '"}
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# FORWARD
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${when log "ipXtables -A FORWARD -j LOG --log-level info --log-prefix 'FORWARD DROP '"}
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# Retiolum
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ip4tables -A Retiolum -j ACCEPT -p icmp --icmp-type echo-request
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ip6tables -A Retiolum -j ACCEPT -p ipv6-icmp -m icmp6 --icmpv6-type echo-request
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ipXtables -A Retiolum -j ACCEPT -p tcp --dport http -m conntrack --ctstate NEW
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${when log "ipXtables -A Retiolum -j LOG --log-level info --log-prefix 'REJECT '"}
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ipXtables -A Retiolum -j REJECT -p tcp --reject-with tcp-reset
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ip4tables -A Retiolum -j REJECT -p udp --reject-with icmp-port-unreachable
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ip4tables -A Retiolum -j REJECT --reject-with icmp-proto-unreachable
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ip6tables -A Retiolum -j REJECT -p udp --reject-with icmp6-port-unreachable
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ip6tables -A Retiolum -j REJECT
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fi
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'';
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}
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@ -8,7 +8,6 @@ in
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imports =
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[
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<secrets/hashedPasswords.nix>
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./iptables.nix
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./networking.nix
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./users.nix
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../common/nixpkgs.nix
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@ -18,6 +17,22 @@ in
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../tv/git/public.nix
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../tv/retiolum.nix
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../tv/sanitize.nix
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{
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imports = [ ../tv/iptables ];
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tv.iptables = {
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enable = true;
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input-internet-accept-new-tcp = [
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"ssh"
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"tinc"
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"smtp"
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"xmpp-client"
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"xmpp-server"
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];
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input-retiolum-accept-new-tcp = [
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"http"
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];
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};
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}
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];
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nix.maxJobs = 1;
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@ -1,76 +0,0 @@
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{ config, pkgs, ... }:
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{
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#
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# iptables
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#
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networking.firewall.enable = false;
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system.activationScripts.iptables =
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let
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log = false;
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when = c: f: if c then f else "";
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in
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''
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ip4tables() { ${pkgs.iptables}/sbin/iptables "$@"; }
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ip6tables() { ${pkgs.iptables}/sbin/ip6tables "$@"; }
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ipXtables() { ip4tables "$@" && ip6tables "$@"; }
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# XXX This fails with the original CAC CentOS 7 kernel.
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if ipXtables -vL >/dev/null; then
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#
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# nat
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#
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# reset tables
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ipXtables -t nat -F
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ipXtables -t nat -X
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#
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ipXtables -t nat -A PREROUTING -j REDIRECT ! -i retiolum -p tcp --dport ssh --to-ports 0
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ipXtables -t nat -A PREROUTING -j REDIRECT -p tcp --dport 11423 --to-ports ssh
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#
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# filter
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#
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# reset tables
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ipXtables -P INPUT DROP
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ipXtables -P FORWARD DROP
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ipXtables -F
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ipXtables -X
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# create custom chains
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ipXtables -N Retiolum
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# INPUT
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ipXtables -A INPUT -j ACCEPT -m conntrack --ctstate RELATED,ESTABLISHED
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ipXtables -A INPUT -j ACCEPT -i lo
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ipXtables -A INPUT -j ACCEPT -p tcp --dport ssh -m conntrack --ctstate NEW
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#ipXtables -A INPUT -j ACCEPT -p tcp --dport http -m conntrack --ctstate NEW
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ipXtables -A INPUT -j ACCEPT -p tcp --dport tinc -m conntrack --ctstate NEW
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ipXtables -A INPUT -j ACCEPT -p tcp --dport smtp -m conntrack --ctstate NEW
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ipXtables -A INPUT -j ACCEPT -p tcp --dport xmpp-client -m conntrack --ctstate NEW
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ipXtables -A INPUT -j ACCEPT -p tcp --dport xmpp-server -m conntrack --ctstate NEW
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ipXtables -A INPUT -j Retiolum -i retiolum
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${when log "ipXtables -A INPUT -j LOG --log-level info --log-prefix 'INPUT DROP '"}
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# FORWARD
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${when log "ipXtables -A FORWARD -j LOG --log-level info --log-prefix 'FORWARD DROP '"}
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# Retiolum
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ip4tables -A Retiolum -j ACCEPT -p icmp --icmp-type echo-request
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ip6tables -A Retiolum -j ACCEPT -p ipv6-icmp -m icmp6 --icmpv6-type echo-request
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ipXtables -A Retiolum -j ACCEPT -p tcp --dport http -m conntrack --ctstate NEW
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${when log "ipXtables -A Retiolum -j LOG --log-level info --log-prefix 'REJECT '"}
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ipXtables -A Retiolum -j REJECT -p tcp --reject-with tcp-reset
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ip4tables -A Retiolum -j REJECT -p udp --reject-with icmp-port-unreachable
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ip4tables -A Retiolum -j REJECT --reject-with icmp-proto-unreachable
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ip6tables -A Retiolum -j REJECT -p udp --reject-with icmp6-port-unreachable
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ip6tables -A Retiolum -j REJECT
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fi
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'';
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}
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@ -8,7 +8,6 @@ in
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imports =
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[
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<secrets/hashedPasswords.nix>
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./iptables.nix
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./networking.nix
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./users.nix
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../common/nixpkgs.nix
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@ -18,6 +17,22 @@ in
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../tv/git/public.nix
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../tv/retiolum.nix
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../tv/sanitize.nix
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{
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imports = [ ../tv/iptables ];
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tv.iptables = {
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enable = true;
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input-internet-accept-new-tcp = [
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"ssh"
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"tinc"
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"smtp"
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"xmpp-client"
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"xmpp-server"
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];
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input-retiolum-accept-new-tcp = [
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"http"
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];
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};
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}
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];
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nix.maxJobs = 1;
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@ -1,76 +0,0 @@
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{ config, pkgs, ... }:
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{
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#
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# iptables
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#
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networking.firewall.enable = false;
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system.activationScripts.iptables =
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let
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log = false;
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when = c: f: if c then f else "";
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in
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''
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ip4tables() { ${pkgs.iptables}/sbin/iptables "$@"; }
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ip6tables() { ${pkgs.iptables}/sbin/ip6tables "$@"; }
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ipXtables() { ip4tables "$@" && ip6tables "$@"; }
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# XXX This fails with the original CAC CentOS 7 kernel.
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if ipXtables -vL >/dev/null; then
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#
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# nat
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#
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# reset tables
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ipXtables -t nat -F
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ipXtables -t nat -X
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#
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ipXtables -t nat -A PREROUTING -j REDIRECT ! -i retiolum -p tcp --dport ssh --to-ports 0
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ipXtables -t nat -A PREROUTING -j REDIRECT -p tcp --dport 11423 --to-ports ssh
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#
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# filter
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#
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# reset tables
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ipXtables -P INPUT DROP
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ipXtables -P FORWARD DROP
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ipXtables -F
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ipXtables -X
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# create custom chains
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ipXtables -N Retiolum
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# INPUT
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ipXtables -A INPUT -j ACCEPT -m conntrack --ctstate RELATED,ESTABLISHED
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ipXtables -A INPUT -j ACCEPT -i lo
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ipXtables -A INPUT -j ACCEPT -p tcp --dport ssh -m conntrack --ctstate NEW
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#ipXtables -A INPUT -j ACCEPT -p tcp --dport http -m conntrack --ctstate NEW
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ipXtables -A INPUT -j ACCEPT -p tcp --dport tinc -m conntrack --ctstate NEW
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ipXtables -A INPUT -j ACCEPT -p tcp --dport smtp -m conntrack --ctstate NEW
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ipXtables -A INPUT -j ACCEPT -p tcp --dport xmpp-client -m conntrack --ctstate NEW
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ipXtables -A INPUT -j ACCEPT -p tcp --dport xmpp-server -m conntrack --ctstate NEW
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ipXtables -A INPUT -j Retiolum -i retiolum
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${when log "ipXtables -A INPUT -j LOG --log-level info --log-prefix 'INPUT DROP '"}
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# FORWARD
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${when log "ipXtables -A FORWARD -j LOG --log-level info --log-prefix 'FORWARD DROP '"}
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# Retiolum
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ip4tables -A Retiolum -j ACCEPT -p icmp --icmp-type echo-request
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ip6tables -A Retiolum -j ACCEPT -p ipv6-icmp -m icmp6 --icmpv6-type echo-request
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ipXtables -A Retiolum -j ACCEPT -p tcp --dport http -m conntrack --ctstate NEW
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${when log "ipXtables -A Retiolum -j LOG --log-level info --log-prefix 'REJECT '"}
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ipXtables -A Retiolum -j REJECT -p tcp --reject-with tcp-reset
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ip4tables -A Retiolum -j REJECT -p udp --reject-with icmp-port-unreachable
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ip4tables -A Retiolum -j REJECT --reject-with icmp-proto-unreachable
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ip6tables -A Retiolum -j REJECT -p udp --reject-with icmp6-port-unreachable
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ip6tables -A Retiolum -j REJECT
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fi
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'';
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}
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93
modules/tv/iptables/config.nix
Normal file
93
modules/tv/iptables/config.nix
Normal file
@ -0,0 +1,93 @@
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{ cfg, lib, pkgs, ... }:
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let
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inherit (pkgs) writeScript writeText;
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inherit (lib) concatMapStringsSep;
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accept-new-tcp = port:
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"-p tcp -m tcp --dport ${port} -m conntrack --ctstate NEW -j ACCEPT";
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rules = iptables-version:
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writeText "tv-iptables-rules${toString iptables-version}" ''
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*nat
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:PREROUTING ACCEPT [0:0]
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:INPUT ACCEPT [0:0]
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:OUTPUT ACCEPT [0:0]
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:POSTROUTING ACCEPT [0:0]
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${concatMapStringsSep "\n" (rule: "-A PREROUTING ${rule}") ([]
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++ [
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"! -i retiolum -p tcp -m tcp --dport 22 -j REDIRECT --to-ports 0"
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"-p tcp -m tcp --dport 11423 -j REDIRECT --to-ports 22"
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]
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)}
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COMMIT
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*filter
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:INPUT DROP [0:0]
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:FORWARD DROP [0:0]
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:OUTPUT ACCEPT [0:0]
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:Retiolum - [0:0]
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${concatMapStringsSep "\n" (rule: "-A INPUT ${rule}") ([]
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++ [
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"-m conntrack --ctstate RELATED,ESTABLISHED -j ACCEPT"
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"-i lo -j ACCEPT"
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]
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++ map accept-new-tcp cfg.input-internet-accept-new-tcp
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++ ["-i retiolum -j Retiolum"]
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)}
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${concatMapStringsSep "\n" (rule: "-A Retiolum ${rule}") ([]
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++ {
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ip4tables = [
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"-p icmp -m icmp --icmp-type echo-request -j ACCEPT"
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];
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ip6tables = [
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"-p ipv6-icmp -m icmp6 --icmpv6-type echo-request -j ACCEPT"
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];
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}."ip${toString iptables-version}tables"
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++ map accept-new-tcp cfg.input-retiolum-accept-new-tcp
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++ {
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ip4tables = [
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"-p tcp -j REJECT --reject-with tcp-reset"
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"-p udp -j REJECT --reject-with icmp-port-unreachable"
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"-j REJECT --reject-with icmp-proto-unreachable"
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];
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ip6tables = [
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"-p tcp -j REJECT --reject-with tcp-reset"
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"-p udp -j REJECT --reject-with icmp6-port-unreachable"
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"-j REJECT"
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];
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}."ip${toString iptables-version}tables"
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)}
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COMMIT
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'';
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startScript = writeScript "tv-iptables_start" ''
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#! /bin/sh
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set -euf
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iptables-restore < ${rules 4}
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ip6tables-restore < ${rules 6}
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'';
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in
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{
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networking.firewall.enable = false;
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systemd.services.tv-iptables = {
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description = "tv-iptables";
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wantedBy = [ "network-pre.target" ];
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before = [ "network-pre.target" ];
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after = [ "systemd-modules-load.service" ];
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path = with pkgs; [
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iptables
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];
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restartIfChanged = true;
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serviceConfig = {
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Type = "simple";
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RemainAfterExit = true;
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Restart = "always";
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ExecStart = "@${startScript} tv-iptables_start";
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};
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};
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}
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11
modules/tv/iptables/default.nix
Normal file
11
modules/tv/iptables/default.nix
Normal file
@ -0,0 +1,11 @@
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arg@{ config, lib, pkgs, ... }:
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let
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cfg = config.tv.iptables;
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arg' = arg // { inherit cfg; };
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in
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{
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options.tv.iptables = import ./options.nix arg';
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config = lib.mkIf cfg.enable (import ./config.nix arg');
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}
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29
modules/tv/iptables/options.nix
Normal file
29
modules/tv/iptables/options.nix
Normal file
@ -0,0 +1,29 @@
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{ lib, ... }:
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let
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inherit (lib) mkOption types;
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in
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|
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{
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enable = mkOption {
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type = types.bool;
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default = false;
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description = "Enable iptables.";
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};
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input-internet-accept-new-tcp = mkOption {
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type = with types; listOf str;
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default = [];
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description = ''
|
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ip{4,6}tables -A INPUT -j ACCEPT -p tcp --dport $port -m conntrack --ctstate NEW
|
||||
'';
|
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};
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|
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input-retiolum-accept-new-tcp = mkOption {
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type = with types; listOf str;
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default = [];
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description = ''
|
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ip{4,6}tables -A Retiolum -j ACCEPT -p tcp --dport $port -m conntrack --ctstate NEW
|
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'';
|
||||
};
|
||||
}
|
||||
@ -9,7 +9,6 @@ in
|
||||
{
|
||||
imports = [
|
||||
./hosts.nix
|
||||
./iptables.nix
|
||||
../common/nixpkgs.nix
|
||||
../tv/base.nix
|
||||
../tv/exim-retiolum.nix
|
||||
@ -22,6 +21,18 @@ in
|
||||
../tv/urxvt.nix
|
||||
../tv/xserver.nix
|
||||
../wu/users.nix
|
||||
{
|
||||
imports = [ ../tv/iptables ];
|
||||
tv.iptables = {
|
||||
enable = true;
|
||||
input-internet-accept-new-tcp = [
|
||||
"ssh"
|
||||
"http"
|
||||
"tinc"
|
||||
"smtp"
|
||||
];
|
||||
};
|
||||
}
|
||||
];
|
||||
|
||||
nix.maxJobs = 8;
|
||||
|
||||
@ -1,69 +0,0 @@
|
||||
{ config, pkgs, ... }:
|
||||
|
||||
{
|
||||
#
|
||||
# iptables
|
||||
#
|
||||
networking.firewall.enable = false;
|
||||
system.activationScripts.iptables =
|
||||
let
|
||||
log = false;
|
||||
when = c: f: if c then f else "";
|
||||
in
|
||||
''
|
||||
ip4tables() { ${pkgs.iptables}/sbin/iptables "$@"; }
|
||||
ip6tables() { ${pkgs.iptables}/sbin/ip6tables "$@"; }
|
||||
ipXtables() { ip4tables "$@"; ip6tables "$@"; }
|
||||
|
||||
#
|
||||
# nat
|
||||
#
|
||||
|
||||
# reset tables
|
||||
ipXtables -t nat -F
|
||||
ipXtables -t nat -X
|
||||
|
||||
#
|
||||
ipXtables -t nat -A PREROUTING -j REDIRECT ! -i retiolum -p tcp --dport ssh --to-ports 0
|
||||
ipXtables -t nat -A PREROUTING -j REDIRECT -p tcp --dport 11423 --to-ports ssh
|
||||
|
||||
#
|
||||
# filter
|
||||
#
|
||||
|
||||
# reset tables
|
||||
ipXtables -P INPUT DROP
|
||||
ipXtables -P FORWARD DROP
|
||||
ipXtables -F
|
||||
ipXtables -X
|
||||
|
||||
# create custom chains
|
||||
ipXtables -N Retiolum
|
||||
|
||||
# INPUT
|
||||
ipXtables -A INPUT -j ACCEPT -m conntrack --ctstate RELATED,ESTABLISHED
|
||||
ipXtables -A INPUT -j ACCEPT -i lo
|
||||
ipXtables -A INPUT -j ACCEPT -p tcp --dport ssh -m conntrack --ctstate NEW
|
||||
ipXtables -A INPUT -j ACCEPT -p tcp --dport http -m conntrack --ctstate NEW
|
||||
ipXtables -A INPUT -j ACCEPT -p tcp --dport tinc -m conntrack --ctstate NEW
|
||||
ipXtables -A INPUT -j ACCEPT -p tcp --dport smtp -m conntrack --ctstate NEW
|
||||
ipXtables -A INPUT -j Retiolum -i retiolum
|
||||
${when log "ipXtables -A INPUT -j LOG --log-level info --log-prefix 'INPUT DROP '"}
|
||||
|
||||
# FORWARD
|
||||
${when log "ipXtables -A FORWARD -j LOG --log-level info --log-prefix 'FORWARD DROP '"}
|
||||
|
||||
# Retiolum
|
||||
ip4tables -A Retiolum -j ACCEPT -p icmp --icmp-type echo-request
|
||||
ip6tables -A Retiolum -j ACCEPT -p ipv6-icmp -m icmp6 --icmpv6-type echo-request
|
||||
|
||||
|
||||
${when log "ipXtables -A Retiolum -j LOG --log-level info --log-prefix 'REJECT '"}
|
||||
ipXtables -A Retiolum -j REJECT -p tcp --reject-with tcp-reset
|
||||
ip4tables -A Retiolum -j REJECT -p udp --reject-with icmp-port-unreachable
|
||||
ip4tables -A Retiolum -j REJECT --reject-with icmp-proto-unreachable
|
||||
ip6tables -A Retiolum -j REJECT -p udp --reject-with icmp6-port-unreachable
|
||||
ip6tables -A Retiolum -j REJECT
|
||||
|
||||
'';
|
||||
}
|
||||
Loading…
Reference in New Issue
Block a user