diff options
Diffstat (limited to 'modules/iptables-cd.nix')
-rw-r--r-- | modules/iptables-cd.nix | 75 |
1 files changed, 75 insertions, 0 deletions
diff --git a/modules/iptables-cd.nix b/modules/iptables-cd.nix new file mode 100644 index 0000000..70736e4 --- /dev/null +++ b/modules/iptables-cd.nix @@ -0,0 +1,75 @@ +{ 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 "$@" && ip6tables "$@"; } + + # XXX This fails with the original CAC CentOS 7 kernel. + if ipXtables -vL >/dev/null; then + + # + # 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 ACCEPT -p tcp --dport xmpp-client -m conntrack --ctstate NEW + #ipXtables -A INPUT -j ACCEPT -p tcp --dport xmpp-server -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 + fi + ''; +} |