06 Lug 18 How to setup xtables GeoIP for iptables on OpenWRT
I’m not racist, but sometimes you may need to keep some people out of your network based on its geographical region… in reality I’m referring to its public source IP address.
Requests are coming from the big internet, so you can check if the source IP of the peers that are trying to connect to your powerful OpenWRT Linux router are coming from a particular region and you may want to stop all those requests accordingly.
If you are using iptables and ip6tables (if you are on linux this is the standard) you can setup GeoIP based packet filtering with iptables: it’s an iptables extension that make use of the glorious and free MaxMind GeoLite Legacy Downloadable Database (that is now dying…).
On OpenWRT this is supported automatically, but generally your router does not have all the disk space to host the entire GeoLite GeoIP database. So, you need to prepare all the records of the geographical regions that you want to block on your firewall.
Take a linux workstation or server (your notebook, a raspberry pi you own always on, one of your client’s server… better not IMHO…) and run those commands:
root@firegate2:~# mkdir /tmp/temp
root@firegate2:~# cd /tmp/temp
root@firegate2:/tmp/temp# /usr/share/xt_geoip/xt_geoip_dl
–2018-07-05 23:54:40– http://geolite.maxmind.com/download/geoip/database/GeoIPv6.csv.gz
Risoluzione di geolite.maxmind.com (geolite.maxmind.com)… 104.16.37.47, 104.16.38.47, 2400:cb00:2048:1::6810:262f, …
Connessione a geolite.maxmind.com (geolite.maxmind.com)|104.16.37.47|:80… connesso.
Richiesta HTTP inviata, in attesa di risposta… 200 OK
Lunghezza: 1715246 (1,6M) [application/octet-stream]
Salvataggio in: “GeoIPv6.csv.gz”GeoIPv6.csv.gz 100%[================================================================>] 1,64M –.-KB/s in 0,1s
2018-07-05 23:54:40 (10,9 MB/s) – “GeoIPv6.csv.gz” salvato [1715246/1715246]
–2018-07-05 23:54:40– http://geolite.maxmind.com/download/geoip/database/GeoIPCountryCSV.zip
Riutilizzo della connessione esistente a geolite.maxmind.com:80.
Richiesta HTTP inviata, in attesa di risposta… 200 OK
Lunghezza: 2540312 (2,4M) [application/zip]
Salvataggio in: “GeoIPCountryCSV.zip”GeoIPCountryCSV.zip 100%[================================================================>] 2,42M 11,3MB/s in 0,2s
2018-07-05 23:54:40 (11,3 MB/s) – “GeoIPCountryCSV.zip” salvato [2540312/2540312]
TERMINATO –2018-07-05 23:54:40–
Tempo totale: 0,4s
Scaricati: 2 file, 4,1M in 0,4s (11,1 MB/s)
Archive: GeoIPCountryCSV.zip
inflating: GeoIPCountryWhois.csv
root@firegate2:/tmp/temp#
root@firegate2:/tmp/temp# /usr/share/xt_geoip/xt_geoip_build -D . *.csv
209370 entries total
0 IPv6 ranges for A1 Anonymous Proxy
32 IPv4 ranges for A1 Anonymous Proxy
0 IPv6 ranges for A2 Satellite Provider
36 IPv4 ranges for A2 Satellite Provider
3 IPv6 ranges for AD Andorra
26 IPv4 ranges for AD Andorra
51 IPv6 ranges for AE United Arab Emirates
302 IPv4 ranges for AE United Arab Emirates
… and continues …
11 IPv6 ranges for ZM Zambia
64 IPv4 ranges for ZM Zambia
14 IPv6 ranges for ZW Zimbabwe
59 IPv4 ranges for ZW Zimbabwe
root@firegate2:/tmp/temp#
The script /usr/share/xt_geoip/xt_geoip_build it’s part of xtables-addons package that you may or may not find on your distribution. Search on google for that.
This will create LE and BE directories. Now you want to extract only the geo regions that you need (ex: CN,UA,TW,VN,VG,KP,VI,KR), like that:
root@firegate2:/tmp/temp# du -csh BE/CN.iv? BE/UA.iv? BE/TW.iv? BE/VN.iv? BE/VG.iv? BE/KP.iv? BE/VI.iv? BE/KR.iv? LE/CN.iv? LE/UA.iv? LE/TW.iv? LE/VN.iv? LE/VG.iv? LE/KP.iv? LE/VI.iv? LE/KR.iv?
36K BE/CN.iv4
48K BE/CN.iv6
24K BE/UA.iv4
16K BE/UA.iv6
8,0K BE/TW.iv4
4,0K BE/TW.iv6
4,0K BE/VN.iv4
4,0K BE/VN.iv6
4,0K BE/VG.iv4
4,0K BE/VG.iv6
4,0K BE/KP.iv4
0 BE/KP.iv6
4,0K BE/VI.iv4
4,0K BE/VI.iv6
8,0K BE/KR.iv4
4,0K BE/KR.iv6
36K LE/CN.iv4
48K LE/CN.iv6
24K LE/UA.iv4
16K LE/UA.iv6
8,0K LE/TW.iv4
4,0K LE/TW.iv6
4,0K LE/VN.iv4
4,0K LE/VN.iv6
4,0K LE/VG.iv4
4,0K LE/VG.iv6
4,0K LE/KP.iv4
0 LE/KP.iv6
4,0K LE/VI.iv4
4,0K LE/VI.iv6
8,0K LE/KR.iv4
4,0K LE/KR.iv6
352K totale
So, in this case we will need 352 Kb of router disk space. After we created the /usr/share/xt_geoip/BE/ and /usr/share/xt_geoip/LE/ directories on our router’s filesystem:
root@dam2ktplinkrouter:~# mkdir -p /usr/share/xt_geoip/BE /usr/share/xt_geoip/LE
We are going to copy those files on our OpenWRT router:
root@firegate2:/tmp/temp# scp LE/CN.iv? LE/UA.iv? LE/TW.iv? LE/VN.iv? LE/VG.iv? LE/KP.iv? LE/VI.iv? LE/KR.iv? root@192.168.10.1:/usr/share/xt_geoip/LE
root@192.168.10.1’s password:
CN.iv4 100% 35KB 109.8KB/s 00:00
CN.iv6 100% 47KB 76.0KB/s 00:00
UA.iv4 100% 23KB 108.4KB/s 00:00
UA.iv6 100% 15KB 87.9KB/s 00:00
TW.iv4 100% 4704 47.5KB/s 00:00
TW.iv6 100% 3104 77.8KB/s 00:00
VN.iv4 100% 3888 98.9KB/s 00:00
VN.iv6 100% 3584 87.9KB/s 00:00
VG.iv4 100% 536 40.1KB/s 00:00
VG.iv6 100% 224 20.0KB/s 00:00
KP.iv4 100% 40 3.9KB/s 00:00
KP.iv6 100% 0 0.0KB/s 00:00
VI.iv4 100% 392 30.6KB/s 00:00
VI.iv6 100% 160 14.4KB/s 00:00
KR.iv4 100% 8128 105.8KB/s 00:00
KR.iv6 100% 3616 87.0KB/s 00:00
root@firegate2:/tmp/temp# scp BE/CN.iv? BE/UA.iv? BE/TW.iv? BE/VN.iv? BE/VG.iv? BE/KP.iv? BE/VI.iv? BE/KR.iv? root@192.168.10.1:/usr/share/xt_geoip/BE/
root@192.168.10.1’s password:
CN.iv4 100% 35KB 114.4KB/s 00:00
CN.iv6 100% 47KB 66.0KB/s 00:00
UA.iv4 100% 23KB 115.2KB/s 00:00
UA.iv6 100% 15KB 74.9KB/s 00:00
TW.iv4 100% 4704 93.8KB/s 00:00
TW.iv6 100% 3104 75.7KB/s 00:00
VN.iv4 100% 3888 108.8KB/s 00:00
VN.iv6 100% 3584 76.2KB/s 00:00
VG.iv4 100% 536 40.3KB/s 00:00
VG.iv6 100% 224 20.0KB/s 00:00
KP.iv4 100% 40 4.1KB/s 00:00
KP.iv6 100% 0 0.0KB/s 00:00
VI.iv4 100% 392 33.1KB/s 00:00
VI.iv6 100% 160 15.4KB/s 00:00
KR.iv4 100% 8128 111.1KB/s 00:00
KR.iv6 100% 3616 71.8KB/s 00:00
root@firegate2:/tmp/temp#
OK, now we have our pieces of geo ip informations. We now need to install the iptables-mod-geoip from the LuCI web interface (or by hand if you like).
Now you can create your Firewall Traffic Rules. Go to Network -> Firewall -> Traffic Rules on the router’s LuCI web interface and add a custom traffic rule. In my case I created 2 that I called “CinamerdaMuoriUDPeTCP” and “CinamerdaMuoriICMP”, the first to block TCP and UDP and the second to block ICMP traffic.
After that you can setup your custom rule setting your protocol and address families, set “source zone” to WAN, “destination zone” to “Any zone (forward)”, action to DROP, and the “Extra arguments” field like this:
-m geoip –source-country CN,UA,TW,VN,VG,KP,VI,KR
You can check the image below.
OpenWRT Firewall geoip example
Now you can say hello to most chinaspammers and something like that, but don’t abuse, this is not ethic if you set up this on a server that offers some sort of public service.
14 Gen 17 Come creare un gateway IPv6 su Fastweb
Fastweb ha deciso per il momento di non fornire IPv6 nativo ai propri clienti, e inoltre da qualche giorno ha disabilitato il tunnel TSP (tsp-auth.ipv6.fastweb.it) il quale non risulta piu’ raggiungibile.
Visto che nel mio caso ho un router fastweb Argo 55+ su fibra 100, e il suddetto router non supporta IPv6, quando vado sulla MyFastPage e cerco di attivare il protocollo IPv6 il sistema mi dice che devo sostituire il router con un nuovo modello. Io NON voglio cambiare router perche’ lo considero estremamente stabile e performante.
Come posso quindi attivare IPv6 nella mia rete domestica senza dover cambiare router?
Fastweb porta IPv6 ai suoi utenti tramite 6rd (https://en.wikipedia.org/wiki/IPv6_rapid_deployment). Questo significa che e’ probabilmente possibile ottenere la subnet in tunnel anche su linux.
Ho preso uno dei miei raspberry pi con raspbian e ci ho installato il pacchetto radvd (sudo apt-get install radvd), poi nel mio /etc/network/interfaces ho messo questo:
iface eth0 inet6 static
address 2001:b07:27b:7b7b::1
netmask 64auto ipv6fastweb
iface ipv6fastweb inet6 v4tunnel
netmask 64
endpoint 81.208.50.214
up ip -6 route add default dev ipv6fastweb
down ip -6 route del default dev ipv6fastweb
Invece di usare come indirizzo ip 2001:b07:27b:7b7b::1 devi calcolarti il tuo a partire dal tuo IP pubblico fisso che ti ha fornito fastweb. Puoi ottenere il tuo ip pubblico ad esempio da qui: http://whatismyipaddress.com/
Facciamo finta che tu abbia l’IP 2.123.123.123, devi convertirlo in esadecimale, ad esempio cosi:
printf “%x%02x:%x%02x::\n” `echo 2.123.123.123 |tr . ” “`
Quello che otterrai, ad esempio 27b:7b7b:: va accodato al prefisso di fastweb (2001:b07:) e come suffisso accodi il numero 1.
In questo caso, quindi, l’IP diventa:
2001:b07:27b:7b7b::1 che e’ stato costruito da [2001:b07]:[b07:27b:7b7b]::[1]. La prima e’ fissa, la seconda dipende dal tuo IP pubblico e infine 1. Questo andra’ messo nella riga “address” nel file /etc/network/interfaces che ti dicevo prima e va anche messo nella direttiva “prefix” del radvd.conf, ma in ques’ultimo caso senza l’1 finale.
Crea il file /etc/radvd.conf e mettici dentro questo:
interface eth0
{
AdvSendAdvert on;
MinRtrAdvInterval 3;
MaxRtrAdvInterval 10;prefix 2001:b07:27b:7b7b::/64
{
AdvOnLink on;
AdvAutonomous on;
AdvRouterAddr on;
};RDNSS 2001:4860:4860::8888
{
AdvRDNSSLifetime 20;
};
};
Riavvia il raspberry pi e se tutto va bene, sempre nel raspberry pi dovrai avere una scheda di rete virtuale chiamata ipv6fastweb senza IP usabili ma che serve per creare il tunnel con il border gateway di fastweb (81.208.50.214). Se non funziona, prova a cercare un altro border gateway, magari chiedendo al numero verde o cercando su internet. A me funziona con questo. Metti quello giusto alla direttiva “endpoint” del file “interfaces”.
Poi avrai l’IP pubblico IPv6 che ti sei calcolato (nel caso di esempio 2001:b07:27b:7b7b::1/64) sulla scheda eth0 e avrai il tuo radvd che invia i router advertisement ipv6 alla tua rete.
Ogni PC nella tua rete che supporta IPv6 otterrà un IP pubblico nella subnet che ti sei calcolato, e sara’ raggiungibile direttamente da internet tramite IPv6.
Bello no? Ovviamente se abilitate questo dovete disabilitare IPv6 sul router di fastweb perche’ sara il vostro raspberry pi a fare da router ipv6.
Commentate sotto, mi raccomando! Fatemi sapere.
A me funziona perfettamente e sono molto felice. Credo che Fastweb dovrebbe creare una guida ufficiale su questo per il bene degli utenti. Ci ho messo 2 ore a farlo funzionare, con una guida ci avrei messo 2 minuti.
17 Set 12 SSH local and remote tunnels
Sometimes you may need to forward remote traffic to a local host through a SSH connection. In other words you can bind a given TCP port to a server running SSH and make remote clients connecting to it, letting the traffic to be redirected to a local server.
You may need to add the parameter GatewayPorts clientspecified to /etc/ssh/sshd_config on the SSH server and restart sshd. This is to enable ssh clients to bind remote connections on a given ip, otherwise you can only connect to the remote port just from 127.0.0.1.
At this point, let me do an example:
- A TCP client wants to connect to 192.168.1.2 on TCP port 18443
- You want to forward TCP traffic from 192.168.1.2:18443 to 11.22.33.44:18443
- You have a client host with IP address 11.22.33.41 that can reach 11.22.33.44
- You can establish a SSH connection from your client (11.22.33.41) to the remote server (192.168.1.2)
If you have the given situation, you can execute the following command to bind the TCP port 18443 on the remote server:
ssh -l root 192.168.1.2 -R:18443:11.22.33.44:18443
Now, you can apply your changes:
- Substitute “root” with your SSH user on the remote SSH server
- Substitute “192.168.1.2” with your remote SSH server IP/host
- Substitute the first “18443” with the port your remote TCP clients need to connect
- Substitute “11.22.33.44” with your internal TCP server to forward traffic coming from the outside
- Substitute the second “18443” with the TCP port listening on the internal host
You can even do the reverse, letting local traffic flowing to an external host, passing through a SSH connection.
Let me do another example:
- You have a client host with IP address 11.22.33.41
- A TCP client wants to connect to 11.22.33.41 (your IP) on TCP port 18443
- You want to forward local TCP traffic from 11.22.33.41:18443 to 192.168.1.3:18443
- You can establish a SSH connection from your client (11.22.33.41) to a remote server (192.168.1.2) that can reach 192.168.1.3
If you have the given situation, you can execute the following command to bind the TCP port 18443 of your computer to the remote server:
ssh -g -l root 192.168.1.2 -L18443:192.168.1.3:18443
Now, apply your changes:
- Substitute “root” with your SSH user on the remote SSH server
- Substitute “192.168.1.2 with your remote SSH server IP/host
- Substitute the first “18443” with the port your local TCP clients need to connect
- Substitute “192.168.1.3” with the remote TCP server you want to reach from your local TCP clients
- Substitute the second “18443” with the TCP port of the remote server
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