ChaosVPN:DNS

We have a DNS running.

how to get entries

Email chaosvpn-join@hamburg.ccc.de to get an entry under .hack or to get a reverse-lookup for your IP / range registered.

configs

The main zonefile atm is edited with vim on cvpn-dns.

This server is available at 172.31.0.5.

You can either be secondary and transfer the zonefile, or query this server.

But for queries it is better to use the anycasted IP 172.31.255.53, which is answered by more than one machine and should stay available in case of problem with the master.

HowTo

These are configuration example for multiple nameserver programs - choose the config for the one you are running.

dnsmasq

Add to /etc/dnsmasq.conf:

server=/hack/172.31.255.53
server=/31.172.in-addr.arpa/172.31.255.53
server=/100.10.in-addr.arpa/172.31.255.53
server=/101.10.in-addr.arpa/172.31.255.53
server=/102.10.in-addr.arpa/172.31.255.53
server=/103.10.in-addr.arpa/172.31.255.53
server=/dn42/172.22.0.53
server=/20.172.in-addr.arpa/172.22.0.53
server=/22.172.in-addr.arpa/172.22.0.53
server=/23.172.in-addr.arpa/172.22.0.53

In some configurations, i.E. in OpenWRT, dnsmasq has rebind protection enabled by default. It will be usefull to exclude the domains above. Add to /etc/dnsmasq.conf too:

rebind-domain-ok=hack
rebind-domain-ok=31.172.in-addr.arpa
rebind-domain-ok=100.10.in-addr.arpa
rebind-domain-ok=101.10.in-addr.arpa
rebind-domain-ok=102.10.in-addr.arpa
rebind-domain-ok=103.10.in-addr.arpa
rebind-domain-ok=dn42
rebind-domain-ok=20.172.in-addr.arpa
rebind-domain-ok=22.172.in-addr.arpa
rebind-domain-ok=23.172.in-addr.arpa

bind9

Should-Do´s:

in /etc/bind/named.conf (or for Debian in /etc/bind/named.conf.local):

NOTE: bind9 in debian now attempts to use DNSSEC, which you need to disable in /etc/bind/named.conf.options. Change 'dnssec-validation auto;' to 'dnssec-validation no;' and the static-stub defs should work.

Bind 9.8+ using static-stub (preferred method, Debian Wheezy or newer)

zone "hack" {
  type static-stub;      
  server-addresses { 172.31.255.53; };
};
zone "dn42" {
  type static-stub;
  server-addresses { 172.23.0.53; };
};
zone "20.in-addr.arpa" {
  type static-stub;
  server-addresses { 172.23.0.53; };
};
zone "22.in-addr.arpa" {
  type static-stub;
  server-addresses { 172.23.0.53; };
};
zone "23.in-addr.arpa" {
  type static-stub;
  server-addresses { 172.23.0.53; };
};
zone "31.172.in-addr.arpa" {
  type static-stub;      
  server-addresses { 172.31.255.53; };
};
zone "100.10.in-addr.arpa" {
  type static-stub;      
  server-addresses { 172.31.255.53; };
};
zone "101.10.in-addr.arpa" {
  type static-stub;      
  server-addresses { 172.31.255.53; };
};
zone "102.10.in-addr.arpa" {
  type static-stub;      
  server-addresses { 172.31.255.53; };
};
zone "103.10.in-addr.arpa" {
  type static-stub;      
  server-addresses { 172.31.255.53; };
};

Bind as secondary

 zone "hack" {
   type slave;
   file "slave/slave.hack";
   masters { 172.31.0.5; };
 };

Old Bind as Forwarder

 zone "hack" {
   type forward;
   forwarders { 172.31.0.5; };
 };

NSD + unbound

unbound and NSD were developed by NLnet Labs with focus on small footprints and reliability. While NSD is a complete name server software for authoritative zones only, they also provide unbound as caching and recursive resolver.

nsd

In /etc/nsd/nsd3.conf add at bottom:

 zone:
       name: "hack"
       zonefile: "hack.zone"
       allow-notify: 127.0.0.1 NOKEY
       allow-notify: 172.31.0.5 NOKEY
       request-xfr: 172.31.0.5 NOKEY

unbound

In /etc/unbound/unbound.conf add at bottom:

 forward-zone:
 	name: "hack"
 	forward-addr: 172.31.255.53
 forward-zone:
 	name: "dn42"
 	forward-addr: 172.23.0.53

Make sure you allow private addresses to be returned (private-domain) and don't check signatures (DNSSEC, domain-insecure) for .hack and .dn42:

 	private-domain: "hack"
 	domain-insecure: "hack"
 	private-domain: "dn42"
 	domain-insecure: "dn42"

maradns

maradns as secondary

 getzone mycoolnode.hack 212.12.52.216 > /etc/maradns/db.domain.hack

Where mycoolnode.hack is the domain name, 212.12.52.216 is the primary name server and db.domain.hack is the filename of the zonefile.

pdns-recursor

Enable in /etc/powerdns/recursor.conf:

forward-zones-file=/etc/powerdns/forward-zones-file.conf

And create /etc/powerdns/forward-zones-file.conf with the following contents:

+hack=172.31.255.53
+31.172.in-addr.arpa=172.31.255.53
+100.10.in-addr.arpa=172.31.255.53
+101.10.in-addr.arpa=172.31.255.53
+102.10.in-addr.arpa=172.31.255.53
+103.10.in-addr.arpa=172.31.255.53
+dn42=172.23.0.53
+20.172.in-addr.arpa=172.23.0.53
+22.172.in-addr.arpa=172.23.0.53
+23.172.in-addr.arpa=172.23.0.53