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authortv <tv@shackspace.de>2015-03-05 13:01:05 +0100
committertv <tv@shackspace.de>2015-05-19 23:10:57 +0200
commitf93ca99fab906b6d2b83dc3b4c9410da7c29bdde (patch)
treee34e330c04beb0822d59da3f43b0a1e32c06b582 /modules/iptables.nix
initial commit
Diffstat (limited to 'modules/iptables.nix')
-rw-r--r--modules/iptables.nix69
1 files changed, 69 insertions, 0 deletions
diff --git a/modules/iptables.nix b/modules/iptables.nix
new file mode 100644
index 000000000..ee4034321
--- /dev/null
+++ b/modules/iptables.nix
@@ -0,0 +1,69 @@
+{ 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
+
+ '';
+}