blacklist-scripts

This is a collection of shell scripts that are intended to block Linux systems and OpenWRT routers from known sources of malicious traffic. These scripts use iptables with highly efficient ipset module to check incoming traffic against blacklists populated from publicly available sources.

Block lists

Emerging Threats - list of other known threats (botnet C&C, compromised servers etc) compiled from various sources, including Spamhaus DROP, Shadoserver and DShield Top Attackers
www.blocklist.de - list of known password bruteforcers supplied by a network of fail2ban users
iBlocklist - various free and subscription based lists
Bogons - IP subnets that should never appear on public Internet; this includes RFC 1918 networks, so be careful with deploying in private networks

firewall.user

This scripts is indended for OpenWRT routers. It will use the following blocklists by default:

www.blocklist.de
Emerging Threats
Bogons

As it includes Bogons, it only checks incoming traffic on the WAN interface of the router. Obviously, if your WAN interface is on RFC 1918 network, you might lose connectivity from that side.

Requirements:

opkg install ipset curl

Installation:

sh firewall.user
cp firewall.user /etc/firewall.user
echo "01 01 * * * sh /etc/firewall.user" >>/etc/crontabs/root

Results:

# iptables -vnL
Chain blocklists (2 references)
 pkts bytes target     prot opt in     out     source               destination         
    0     0 LOG        all  --  eth0.2 *       0.0.0.0/0            0.0.0.0/0           match-set emerging-Block-IPs.txt src,dst limit: avg 10/min burst 5 LOG flags 0 level 4 prefix `BLOCK emerging-Block-IPs.txt ' 
    0     0 DROP       all  --  eth0.2 *       0.0.0.0/0            0.0.0.0/0           match-set emerging-Block-IPs.txt src,dst 
    0     0 LOG        all  --  eth0.2 *       0.0.0.0/0            0.0.0.0/0           match-set fullbogons-ipv4.txt src,dst limit: avg 10/min burst 5 LOG flags 0 level 4 prefix `BLOCK fullbogons-ipv4.txt ' 
    0     0 DROP       all  --  eth0.2 *       0.0.0.0/0            0.0.0.0/0           match-set fullbogons-ipv4.txt src,dst 
    6   783 LOG        all  --  eth0.2 *       0.0.0.0/0            0.0.0.0/0           match-set export-ips_all.txt src,dst limit: avg 10/min burst 5 LOG flags 0 level 4 prefix `BLOCK export-ips_all.txt ' 
    6   783 DROP       all  --  eth0.2 *       0.0.0.0/0            0.0.0.0/0           match-set export-ips_all.txt src,dst 

Chain forward (1 references)
 pkts bytes target     prot opt in     out     source               destination         
 14994 1753K blocklists  all  --  *      *       0.0.0.0/0            0.0.0.0/0           state NEW,RELATED 
 ...

Chain input (1 references)
 pkts bytes target     prot opt in     out     source               destination         
  250 13802 blocklists  all  --  *      *       0.0.0.0/0            0.0.0.0/0           state NEW,RELATED
  ...

# ipset list | wc -l
21553

blacklist.sh

This script is intended for Linux servers. It does not load Bogons blocklist which can cause serious problems in VPS environments. Blacklists used:

www.blocklist.de
Emerging Threats